CN110671879B - Refrigerator and control method thereof - Google Patents

Abstract

The invention discloses a refrigerator and a control method thereof, and relates to the technical field of freezing and fresh-keeping. The invention implements different air supply modes at different stages by controlling the air passage of the air duct, and solves the problems that frozen food can not be processed for the second time without unfreezing and nutrient substances are lost in the freezing and unfreezing processes.

Description

Refrigerator and control method thereof

Technical Field

The invention relates to the technical field of freezing and fresh-keeping, in particular to a refrigerator and a control method thereof.

Background

With the improvement of living standard, the requirement of freshness of food materials for consumers is increasing. At present, the refrigeration and preservation technology for fruits and vegetables is more, and the effective preservation method for frozen foods is less, especially for fish, shrimps and the like. When the traditional refrigerator freezes food, because the air outlet temperature of the freezing chamber or the freezing chamber is low, the heat conductivity coefficient of the food is low, the heat transfer efficiency is low, and the surface of the food is often frozen firstly and then gradually slowly crystallized towards the interior of the food. In this state, there are the following problems: 1. the ice crystals formed by freezing the food have large volume and high hardness, so that the food can be processed only by unfreezing; 2. the ice crystals formed in the freezing process are sharp in shape, so that food cells are easy to puncture, and in the unfreezing process, the cell sap of the punctured food cells is lost, so that the loss of the nutrient components of the food is caused.

Disclosure of Invention

In view of the above, the present invention provides a supercooling freezing method, a refrigerator and a refrigerator control method. Different air supply modes are implemented at different stages in the supercooling freezing method by controlling the air passage of the air duct, so that the food freezing process is quicker, the ice crystals are finer and smoother, and the cutting can be easily realized without unfreezing; meanwhile, the damage of food cells is avoided, and the loss of nutrient substances in the freezing and unfreezing processes is reduced.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention provides a supercooling freezing method, which comprises the following steps:

a pre-cooling stage, in which the temperature of the stored goods is reduced to a first temperature T1 which is not lower than the freezing point T2 of the stored goods within the time delta T1;

a supercooling phase, namely cooling the stored goods from a first temperature T1 to a fourth temperature T4 which is lower than the freezing point T2 of the stored goods within a time delta T2 and maintaining the temperature for a period of time delta T3;

a rapid freezing stage, in which the temperature of the stored goods is reduced from a fourth temperature T4 to a fifth temperature T5 within the time of Δ td;

a normal preservation stage, namely, raising the temperature of the stored goods from T5 to a third temperature T3 which is higher than the fourth temperature T4 but lower than the freezing point temperature T2 of the stored goods for preservation;

the method is characterized in that:

different air supply modes are implemented to the different stages through controlling the air duct air path, wherein:

in the supercooling stage, a shower type air supply mode from top to bottom is carried out on the stored goods, so that cold air is not directly blown to the stored goods, and naturally sinks from the top of the freezing chamber to generate natural convection heat exchange with the stored goods;

and in the quick freezing stage, a strong cold air supply mode is implemented on the stored articles, so that cold air is directly blown to the stored articles to perform forced convection heat exchange with the stored articles.

Preferably, the supercooling phase shower type air supply mode is realized by an air distribution plate with air distribution holes.

The scheme is preferable, and the sectional area of the air distribution holes is controlled to be 1cm²～4cm²。

The scheme can be optimized, and the air distribution distance between the air distribution plate and the stored articles is controlled to be more than or equal to 5 cm.

Preferably, the air distribution holes form staggered air supply on the air distribution plate.

The above-mentioned scheme is preferable, the strong cold air supply mode for the stored goods is realized by an air supply outlet arranged at the bottom or the side wall of the freezing chamber.

Preferably, the pre-cooling stage adopts a shower type air supply mode from top to bottom and/or a strong cold air supply mode.

Preferably, the normal preservation stage adopts a shower type air supply mode from top to bottom.

The above scheme is preferable, the first temperature is 0 ℃ to T1 ℃ to 5 ℃, the second temperature is-5 ℃ to T2 ℃ to 0 ℃, the third temperature is-10 ℃ to T3 ℃ to 0 ℃, the fourth temperature is-10 ℃ to T4 ℃ to 3 ℃, and the fifth temperature is-40 ℃ to T5 ℃ to 5 ℃; the time 1h ≦ Δ t1 ≦ 6h, the time 0h ≦ Δ t2 ≦ 2h, the time 0h ≦ Δ t3 ≦ 4h, and the time 5h ≦ Δ td ≦ 8 h.

Preferably, the rapid freezing stage adopts multi-stage cooling, and includes three stages: the first stage is as follows: the supercooling is firstly released in the time delta T4 so that the temperature of the stored goods is raised to the temperature T2; and a second stage: maintaining the temperature of the stored goods at T2 for a time Δ T5; and in the third stage, the temperature of the stored goods is reduced to T5 and maintained for delta T7 within delta T6 time.

Preferably, the time 0h is more than or equal to Δ t4 and less than or equal to 1h, the time 0.5h is more than or equal to Δ t5 and less than or equal to 4h, the time 0.5h is more than or equal to Δ t6 and less than or equal to 2h, and the time 0h is less than or equal to Δ t7 and less than or equal to 2 h.

The invention also provides a refrigerator, which is provided with a freezing chamber (1) for realizing supercooling freezing of stored goods, and is characterized in that: the top of the freezing chamber (1) forms a static pressure mixing chamber (2), an air distribution plate is separated between the static pressure mixing chamber (2) and the freezing chamber (1), and air distribution holes are formed in the air distribution plate; the static pressure mixing cavity (2) is provided with a first air outlet (5), the lower part of the freezing chamber (1) is provided with a second air outlet (6), and the two air outlets are communicated with a cold air supply duct; the air supply duct is provided with an air duct reversing device (4) for controlling cold air of the air supply duct to flow to the first air outlet (5) and/or the second air outlet (6) so as to be controlled to change an air supply mode at different stages in the freezing process of the stored articles.

According to the scheme, the air distribution plate can preferably realize air supply in a shower type air supply mode.

The scheme is preferable, and the sectional area of the air distribution holes is controlled to be 1cm²～4cm²。

In the above aspect, the air duct preferably has a first air passage leading to the first air supply port (5) and a second air passage leading to the second air supply port (6); the air duct reversing device (4) comprises a first air door for controlling the first air path and a second air door for controlling the second air path.

The present invention also provides a refrigerator control method according to the claims, characterized in that: the method comprises the following steps:

pre-cooling stage S1: the operation is started, the air outlet is not limited, the first air outlet and/or the second air outlet are/is opened as required to supply cold to the freezing chamber (1), and the stored goods to be frozen are cooled to a first temperature T1 which is not lower than the freezing point T2 of the stored goods within the time delta T1;

supercooling stage S2: when the temperature of the stored articles is reduced to a first temperature T1 which is not lower than a freezing point T2 of the stored articles within the time delta T1, air is exhausted by adopting a first air outlet (5), so that the freezing chamber (1) is slowly cooled; when the temperature of the stored goods is slowly reduced to a fourth temperature T4 lower than the freezing point T2 of the stored goods within the time delta T2, the freezing chamber (1) stops reducing the temperature and keeps the temperature stable at T4, and the time delta T3 is maintained;

fast freeze phase S3: supercooling is removed, air is discharged from a second air outlet (6) to quickly cool the freezing chamber (1) and store articles, and the temperature of the stored articles is increased from T4 to T2 within the time delta T4; stopping cooling, keeping the temperature of the stored articles stable at T2, and maintaining for delta T5 time; decreasing the temperature of the stored goods from T2 to T5 for a time Δ T6 and maintaining for a time Δ T7;

supercooling stage S4: the air is discharged from the first air outlet (5) to ensure that the temperature of the freezing chamber (1) is raised to a third temperature T3 which is higher than the fourth temperature T4 but lower than the freezing point temperature T2 of the stored goods; then, the temperature rise is stopped, and the temperature is stabilized at the third temperature T3, so that the stored goods are normally stored.

The above scheme is preferable, the first temperature is 0 ℃ to T1 ℃ to 5 ℃, the second temperature is-5 ℃ to T2 ℃ to 0 ℃, the third temperature is-10 ℃ to T3 ℃ to 0 ℃, the fourth temperature is-10 ℃ to T4 ℃ to 3 ℃, and the fifth temperature is-40 ℃ to T5 ℃ to 5 ℃; the time is 1h or more and Δ t1 or more and 6h or more, the time is 0h or more and Δ t2 or more and 2h or more, the time is 0h or more and Δ t3 or more and 4h or more, the time is 0h or more and Δ t4 or more and 1h or more, the time is 0.5h or more and Δ t5 or more and 4h or more, the time is 0.5h or more and Δ t6 or more and 2h or less, the time is 0h or more and Δ t7 or more and 2h or more, and the time is 5h or more and Δ td or more and 8h or more. (ii) a It may be further preferable that the first temperature is 0 ℃ to T1 ℃ to 2 ℃, the second temperature is-3 ℃ to T2 ℃ to-1 ℃, the third temperature is-7 ℃ to T3 to-3 ℃, the fourth temperature is-7 ℃ to T4 to-5 ℃, and the fifth temperature is-7 ℃ to T5 to-3 ℃; the time 2h is less than or equal to Δ t1 is less than or equal to 4h, the time 1h is less than or equal to Δ t2 is less than or equal to 2h, the time 1h is less than or equal to Δ t3 is less than or equal to 2h, the time 0h is less than or equal to Δ t4 is less than or equal to 0.5h, the time 2h is less than or equal to Δ t5 is less than or equal to 3h, the time 1h is less than or equal to Δ t6 is less than or equal to 2h, the time 0h is less than or equal to Δ t7 is less than or equal to 1h, and the time 6h is less than or equal to Δ td.

According to the invention, different air supply modes are implemented at different stages in the supercooling freezing method by controlling the air passage of the air duct, so that the food freezing process is quicker, the ice crystals are finer and smoother, and the cutting can be easily realized without unfreezing; meanwhile, the damage of food cells is avoided, and the loss of nutrient substances in the freezing and unfreezing processes is reduced.

Drawings

The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic view of a freezing chamber according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a method for controlling food temperature and air output according to an embodiment of the present invention;

fig. 3 is a control method of a refrigerator according to any one embodiment of the present invention;

in the figure:

1-a freezing chamber; 2-static pressure mixing chamber; 3-a tiny air outlet; 4-air duct switching device; 5-a first air outlet; 6-second air outlet

Best mode for carrying out the invention

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

The invention provides a supercooling freezing method, a refrigerator and a refrigerator control method. Different air supply modes are implemented at different stages in the supercooling freezing method by controlling the air passage of the air duct, so that the food freezing process is quicker, the ice crystals are finer and smoother, and the cutting can be easily realized without unfreezing; meanwhile, the damage of food cells is avoided, and the loss of nutrient substances in the freezing and unfreezing processes is reduced.

Example 1:

the present embodiment provides a household refrigerator.

As shown in figure 1, the refrigerator is provided with a freezing chamber, a quick freezing chamber for realizing supercooling freezing of stored goods, a staticpressure mixing chamber 2 which is formed with the freezing chamber 1 in an integrated way is separately arranged at the top of the freezing chamber 1, an air distribution plate is separated between the static pressure mixing chamber and the freezing chamber, the air distribution plate can preferably move up and down along the inner wall of the refrigerator to adjust the distance between the air distribution plate and the stored goods, and the cross section area formed on the air distribution plate is controlled to be 1cm²～4cm²The air distribution holes with the sizes are used for realizing air supply in a shower type air supply mode.

The side wall of the staticpressure mixing cavity 2 is provided with afirst air outlet 5, the side wall of the lower part of the freezing chamber 1 is provided with a second air outlet 6, and the two air outlets are communicated with a cold air supply duct; the air supply duct is provided with an airduct reversing device 4 for controlling the flow of cold air of the air supply duct to afirst air outlet 5 and/or a second air outlet 6, and a first air path leading to the firstair supply outlet 5 and a second air path leading to the second air supply outlet 6 are formed in the air supply duct; the airduct reversing device 4 comprises a first air door for controlling the first air duct and a second air door for controlling the second air duct, so that the air duct reversing device is controlled to change the air supply mode at different stages of the freezing process of the stored goods.

Preferably, the air distribution plate is provided with staggered or annularly distributed air distribution holes, and the air distribution plate forms dispersion guide grooves around the hole walls of the air distribution holes; preferably, the air distribution holes form multiple annular air supply from inside to outside on the air distribution plate, and the closer to the middle position of the ring, the more densely the air distribution holes are arranged, and the air distribution holes form a dome shape.

Preferably, the lower part of the staticpressure mixing cavity 2 is provided with the micro air port 3, the air flow pressure in the cavity is relatively uniform after the cold air flowing into thefirst air outlet 5 passes through the staticpressure mixing cavity 2, and at the moment, the cold air can uniformly flow into the freezing chamber 1 from top to bottom through the micro air port 3 at the lower part of the staticpressure mixing cavity 2, so that the temperature uniformity in the freezing chamber 1 is favorably improved.

Preferably, the peripheral edge of the bottom of the freezing chamber can form an air return opening or a return air cavity separated by the same or similar air distribution plate is formed below the freezing chamber, and the natural wind effect of top air outlet is more favorably formed by utilizing the air return holes of the air distribution plate.

In addition, the refrigerator in the embodiment can independently or intensively select the air channels according to the temperature change of the freezing chamber or food, and the temperature field distribution of the freezing chamber and the temperature drop rate of the food are controlled through the change of the air channel selection, so that the food freezing process is quicker, the ice crystals are finer and smoother, and the cutting can be easily realized without unfreezing; meanwhile, the damage of food cells is avoided, and the loss of nutrient substances in the freezing and unfreezing processes is reduced.

The following stored goods will be described with reference to a meat product as an example, and the supercooling freezing process which can be realized by the refrigerator is described as follows:

a pre-cooling stage: starting to operate, wherein the air outlet is not limited, the first air outlet and/or the second air outlet are/is opened as required to supply cold to the freezing chamber 1, and the stored goods to be frozen are cooled to a first temperature T1 which is not lower than the freezing point T2 of the stored goods within the time delta T1;

and (3) a supercooling stage: when the temperature of the stored articles is reduced to a first temperature T1 which is not lower than a freezing point T2 of the stored articles within the time delta T1, air is exhausted by adopting afirst air outlet 5, so that the freezing chamber 1 is slowly cooled; when the temperature of the stored goods is slowly reduced to a fourth temperature T4 lower than the freezing point T2 of the stored goods within the time delta T2, the freezing chamber 1 stops reducing the temperature and keeps the temperature stable at T4 for delta T3;

a quick freezing stage: supercooling is removed, air is discharged from a second air outlet 6 to quickly cool the freezing chamber 1 and store articles, and the temperature of the stored articles is increased from T4 to T2 within the time of delta T4; stopping cooling, keeping the temperature of the stored articles stable, and maintaining the temperature at T2 for delta T5; decreasing the temperature of the stored goods from T2 to T5 for a time Δ T6 and maintaining for a time Δ T7;

and (3) a supercooling stage: the air is discharged from thefirst air outlet 5 to ensure that the temperature of the freezing chamber 1 is raised to a third temperature T3 which is higher than the fourth temperature T4 but lower than the freezing point temperature T2 of the stored goods; then, the temperature rise is stopped, and the temperature is stabilized at the third temperature T3, so that the stored goods are normally stored.

Specifically, the overall multi-stage temperature supercooling freezing process may be optimized in terms of parameters:

a first temperature of 0 ℃ to 5 ℃, a second temperature of-5 ℃ to 0 ℃, a third temperature of-10 ℃ to 0 ℃, a T3 to 0 ℃, a fourth temperature of-10 ℃ to 3 ℃, a fifth temperature of-40 ℃ to 3 ℃ to T5 to-5 ℃; time 1h is less than or equal to Δ t1 is less than or equal to 6h, time 0h is less than or equal to Δ t2 is less than or equal to 2h, time 0h is less than or equal to Δ t3 is less than or equal to 4h, time 0h is less than or equal to Δ t4 is less than or equal to 1h, time 0.5h is less than or equal to Δ t5 is less than or equal to 4h, time 0h is less than or equal to Δ t6 is less than or equal to 2h, time 0h is less than or equal to Δ t7 is less than or equal to 2h, and time 5h is less than or equal to Δ td is less than.

Further preferred is: a first temperature of 0 ℃ to 2 ℃, a second temperature of-3 ℃ to 1 ℃, a third temperature of-7 ℃ to 3 ℃, a fourth temperature of-7 ℃ to 5 ℃, a temperature of-7 ℃ to T4 to 3 ℃, and a fifth temperature of-7 ℃ to 3 ℃ to T5 to 3 ℃; time 2h ≦ Δ t1 ≦ 4h, time 1h ≦ Δ t2 ≦ 2h, time 1h ≦ Δ t3 ≦ 2h, time 0h ≦ Δ t4 ≦ 0.5h, time 2h ≦ Δ t5 ≦ 3h, time 1h ≦ Δ t6 ≦ 2h, time 0h ≦ Δ t7 ≦ 1h, and time 6h ≦ Δ td ≦ 8 h.

Example 2:

as shown in fig. 1 to 3, this embodiment takes the refrigerator provided in embodiment 1 as an example, and provides a refrigerator control method, which includes the following steps:

pre-cooling stage S1: starting to operate, wherein the air outlet is not limited, the first air outlet and/or the second air outlet are/is opened as required to supply cold to the freezing chamber 1, and the stored goods to be frozen are cooled to a first temperature T1 which is not lower than the freezing point T2 of the stored goods within the time delta T1; wherein 0 ℃ C. and 10 ℃ C., T1 ℃ C., -5 ℃ C. and T2 ℃ C.,. 0 ℃ C.; 1h ≦ Δ t1 ≦ 6 h; preferably, 0 ℃ to T1 ℃ to 2 ℃ to 3 ℃ to T2 ℃ to 1 ℃; 2h ≦ Δ t1 ≦ 4 h; the effect is that: the optimization of the stage can ensure that the food which needs to be supercooled and frozen can quickly enter a low-temperature area required by the supercooling process from a normal-temperature state, and the food is not frozen. The cooling measure can ensure that food can successfully enter the supercooling process in the follow-up process, improve the efficiency of the supercooling freezing process to a certain extent and shorten the time required by the whole process.

Supercooling stage S2: when the temperature of the stored articles is reduced to the first temperature T1 within the time delta T1, thefirst air outlet 5 is adopted to exhaust air, so that the freezing chamber 1 is slowly cooled. When the temperature of the stored goods is slowly reduced to a fourth temperature T4 lower than the freezing point T2 of the stored goods within the time delta T2, the temperature reduction of the freezing chamber 1 is stopped and is kept stable for a time delta T3; wherein T4 is between minus 10 ℃ and minus 3 ℃; -40 ℃ and T5 ℃ and-5 ℃; 0h ≦ Δ T2 ≦ 2h, 0h ≦ Δ T3 ≦ 4h, further preferably, the fourth temperature is-7 ℃ ≦ T4 ≦ 5 ℃, the fifth temperature is-7 ℃ ≦ T5 ≦ 3 ℃; 1h ≦ Δ t2 ≦ 2h, and 1h ≦ Δ t3 ≦ 2 h. The optimization effect of the stage is that the exterior and the interior of the food are fully supercooled, a plurality of ice nucleuses can be uniformly formed on the whole food in the subsequent quick freezing process, and the ice nucleuses finally grow into fine granular ice crystals without damaging the texture structure of the food.

Fast freeze phase S3: and (3) relieving supercooling, rapidly cooling the stored articles in the freezing chamber 1 by adopting the air discharged from the second air outlet 6, rapidly freezing the stored articles, and stopping cooling and maintaining the freezing chamber at the temperature for a certain time when the temperature of the stored articles is reduced from the fourth temperature T4 to the fifth temperature T5 within the range of delta td. Specifically, the rapid freezing stage can be optimized to perform multi-stage cooling within the time of Δ td, and comprises three stages: the first stage is as follows: the supercooling is firstly released in the time delta T4 so that the temperature of the stored goods is raised to the temperature T2; and a second stage: controlling the temperature of the stored goods to be maintained at a freezing point T2 for a time delta T5; and in the third stage, the temperature of the stored goods is reduced from T2 to T5 and maintained at T5 and at the time of delta T7 in delta T6. Preferably, 0h is more than or equal to Δ t4 and less than or equal to 1h, 0.5h is more than or equal to Δ t5 and less than or equal to 4h, 0.5h is more than or equal to Δ t6 and less than or equal to 2h, 0h is more than or equal to Δ t7 and less than or equal to 2h, and 5h is more than or equal to Δ td and less than or equal to 8 h; more preferably, 0h < delta t4 is less than or equal to 0.5 h; delta t5 is more than 2h and less than or equal to 3 h; 1h < Δ t6 is not less than 2h, 6h ≦ Δ td ≦ 8h, and 0h ≦ Δ t7 ≦ 1 h. Therefore, the food can be quickly frozen, the moisture in the food can be frozen into fine granular ice crystals, and the fresh-keeping time of the food is prolonged while the texture structure and the flavor of the food are not damaged.

Normal save phase S4: the air is discharged from thefirst air outlet 5 to ensure that the temperature of the freezing chamber 1 is raised to a third temperature T3 which is higher than the fourth temperature T4 but lower than the freezing point temperature T2 of the stored goods; stopping heating, stabilizing the temperature at a third temperature T3, and storing the stored articles normally; wherein the temperature of-10 ℃ and/or more than T3 ℃ and/or less than 0 ℃ is preferably the temperature of-7 ℃ and/or more than T3 ℃ and/or less than-3 ℃.

The supercooling freezing process is controlled very importantly, the application is designed to be simple, the supercooling freezing process is controlled to be simpler and easier to operate through reasonable matching of natural air and forced cooling, and further, cooling time and cooling temperature of each cooling stage are optimized so as to achieve a better supercooling freezing effect by matching more reasonable cooling speed with the control of the air deflector.

Preferably, the air distribution holes can also form a plurality of annular curtains for air supply from inside to outside on the air distribution plate, and the closer to the middle position, the stronger the air supply strength is.

In the supercooling freezing method of the present embodiment, the freezing point means a phase transition temperature at which a liquid substance in a stored article such as food is changed from a liquid state to a solid state, and the Δ t parameter may be set as a time difference or a total time. The forced cooling air supply mode comprises a mode of being straight downwards and upwards, for example, an air outlet is formed on a tray or a partition board for storing articles, and the forced cooling air supply mode comprises the step of blowing air towards the stored articles from a side air outlet at the lower part of the freezing chamber, but the flow direction of the final air flow is upwards. The device using the supercooling freezing method can be used for storing articles such as food, the freezing process is quicker, ice crystals are finer and smoother, and the cutting can be easily realized without unfreezing; meanwhile, the damage of food cells is avoided, and the loss of nutrient substances in the freezing and unfreezing processes is reduced.

It should be noted that:

1) in the refrigerator control method of the present embodiment, the freezing point means a phase transition temperature at which a liquid substance in a stored article such as food is changed from a liquid state to a solid state, and the Δ t parameter may be set as a time difference or a total time. The refrigerator using the refrigerator control method has the advantages that the food freezing process is quicker, the ice crystals are finer and smoother, and the cutting can be easily realized without unfreezing; meanwhile, the damage of food cells is avoided, and the loss of nutrient substances in the freezing and unfreezing processes is reduced.

2) Tn denotes the temperature of the stored goods at a certain stage node. The control temperature Tn of the stage node in the method steps described in the application can be controlled by monitoring the temperature of the stored articles, can also be controlled by indirectly monitoring the temperature of the freezing chamber, and can also be controlled by indirectly monitoring the refrigeration time. The present invention is not particularly limited as to the specific temperature monitoring means, which can directly monitor the temperature of the stored goods by the temperature sensor, and the present invention does not specifically limit the monitoring means as long as the temperature control of the stored goods at each cooling stage can be realized.

3) tn is a certain time node, and Δ t represents the time difference between two time nodes:

Δtn＝tn-tn-1,n≧1：Δt1＝t1-t0；Δt2＝t2-t1；Δt3＝t3-t2；Δt4＝t4-t3；Δt5＝t5-t4；Δt6＝t6-t5；Δt7＝t7-t6；

the quick freezing time Δ td is t7-t 3. The time difference Δ t may be preset by a refrigerator controller, or may be realized by monitoring time progress points t1, t2, t3, t4, t5, t6, and t7 with a timer, where t0 is a start time, or may be realized by directly controlling a temperature.

4) The air guide plate is used for adjusting the air supply direction, and is not limited to be used in combination with other means, such as a compressor, cold air flow, cold air temperature and cooling time.

5) The freezer compartment of the present invention is adapted to be a single quick-freezer compartment and is designed to be located between a conventional fresh food compartment and a freezer compartment. The fresh food compartment is above the quick freezer compartment and the freezer compartment is below the quick freezer compartment.

6) The refrigerator provided by the invention covers all occasions with freezing requirements, such as household refrigerators, industrial refrigerators and the like, and the stored articles are not limited to food, but also can be other products, such as corpses. Preferred for the present invention are meat storage items such as beef, chicken, fish and like meat products.

In summary, the invention provides a supercooling freezing method, a refrigerator and a refrigerator control method, and relates to the technical field of freezing and refreshing. The reasonable matching use of natural wind and strong cooling wind solves the problems that when the food is frozen by the traditional refrigerator, the frozen food is too hard and can not be unfrozen for secondary processing; the loss of nutrient substances caused by the extrusion or puncture of food cells by ice crystals in the freezing and unfreezing processes.

Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the disclosure is not limited to the precise construction, arrangement of parts, or methods of operation described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (19)

1. A refrigerator provided with a freezing chamber (1) for supercooling and freezing stored goods, characterized in that: the top of the freezing chamber (1) forms a static pressure mixing chamber (2), an air distribution plate is separated between the static pressure mixing chamber (2) and the freezing chamber (1), and air distribution holes are formed in the air distribution plate; the static pressure mixing cavity (2) is provided with a first air outlet (5), the lower part of the freezing chamber (1) is provided with a second air outlet (6), and the two air outlets are communicated with a cold air supply duct; the air supply duct is provided with an air duct reversing device (4) for controlling cold air of the air supply duct to flow to the first air outlet (5) and/or the second air outlet (6) so as to realize the change of an air supply mode at different stages in the freezing process of the stored articles;

the refrigerator adopts the following control method for the freezing chamber:

pre-cooling stage S1: the operation is started, the air outlet is not limited, the first air outlet and/or the second air outlet are/is opened as required to supply cold to the freezing chamber (1), and the stored goods to be frozen are cooled to a first temperature T1 which is not lower than the freezing point T2 of the stored goods within the time delta T1;

supercooling stage S2: when the temperature of the stored articles is reduced to a first temperature T1 which is not lower than the freezing point temperature T2 of the stored articles within the time delta T1, air is exhausted by adopting a first air outlet (5), so that the freezing chamber (1) is slowly cooled; when the temperature of the stored goods is slowly reduced to a fourth temperature T4 lower than the freezing point temperature T2 of the stored goods within the time delta T2, the freezing chamber (1) stops reducing the temperature and keeps stable for the time delta T3;

fast freeze phase S3: and (3) relieving supercooling, adopting air outlet of a second air outlet (6) to quickly cool the freezing chamber (1) and quickly freeze the stored articles, and cooling the stored articles from the fourth temperature T4 to the fifth temperature T5 within the time delta td: raising the temperature of the stored goods from T4 to T2 within the time delta T4; stopping cooling, stabilizing the temperature of the stored articles at T2, and maintaining for a time delta T5; decreasing the temperature of the stored items from T2 to a fifth temperature T5 for a time Δ T6 and maintaining for a time Δ T7;

normal save phase S4: the air is discharged from the first air outlet (5) to ensure that the temperature of the freezing chamber (1) is raised to a third temperature T3 which is higher than the fourth temperature T4 but lower than the freezing point temperature T2 of the stored goods; then, the temperature rise is stopped, and the temperature is stabilized at the third temperature T3, so that the stored goods are normally stored.

2. The refrigerator of claim 1, wherein: the air distribution plate realizes air supply in a shower type air supply mode.

3. The refrigerator of claim 2, wherein: the sectional area of the air distribution hole is controlled to be 1cm²～4cm²。

4. The refrigerator of claim 2, wherein: the air supply channel is provided with a first air path leading to the first air supply outlet (5) and a second air path leading to the second air supply outlet (6); the air duct reversing device (4) comprises a first air door for controlling the first air path and a second air door for controlling the second air path.

5. The refrigerator according to any one of claims 2 to 4, wherein: the first temperature is 0 ℃ to 5 ℃ inclusive, the freezing point temperature of the storage product is-5 ℃ to 0 ℃ inclusive, the third temperature is-10 ℃ to 0 ℃ inclusive, the fourth temperature is-10 ℃ to 3 ℃ inclusive, the T4 is to 3 ℃ inclusive, and the fifth temperature is-40 ℃ to 5 ℃ inclusive, T5 to 5 ℃ inclusive; the time is 1h or more and Δ t1 or more and 6h or more, the time is 0h or more and Δ t2 or more and 2h or more, the time is 0h or more and Δ t3 or more and 4h or more, the time is 0h or more and Δ t4 or more and 1h or more, the time is 0.5h or more and Δ t5 or more and 4h or more, the time is 0.5h or more and Δ t6 or more and 2h or less, the time is 0h or more and Δ t7 or more and 2h or more, and the time is 5h or more and Δ td or more and 8h or more.

6. The refrigerator of claim 5, wherein: the first temperature is 0 ℃ to 2 ℃ inclusive, the freezing point temperature of the storage is-3 ℃ to 1 ℃ inclusive, the third temperature is-7 ℃ to 3 ℃ to T3 to 5 ℃ inclusive, the fourth temperature is-7 ℃ to T4 to 5 ℃ inclusive, and the fifth temperature is-7 ℃ to T5 to 3 ℃ inclusive; the time 2h is less than or equal to Δ t1 is less than or equal to 4h, the time 1h is less than or equal to Δ t2 is less than or equal to 2h, the time 1h is less than or equal to Δ t3 is less than or equal to 2h, the time 0h is less than or equal to Δ t4 is less than or equal to 0.5h, the time 2h is less than or equal to Δ t5 is less than or equal to 3h, the time 1h is less than or equal to Δ t6 is less than or equal to 2h, the time 0h is less than or equal to Δ t7 is less than or equal to 1h, and the time 6h is less than or equal to Δ td.

7. The refrigerator of claim 1, wherein: and in the supercooling stage, a shower type air supply mode from top to bottom is implemented on the stored articles, so that cold air is not directly blown to the stored articles, natural sedimentation is performed from the top of the freezing chamber (1) to generate natural convection heat exchange with the stored articles, and the shower type air supply mode is realized through an air distribution plate provided with air distribution holes.

8. The refrigerator of claim 7, wherein: the sectional area of the air distribution hole is controlled to be 1cm²～4cm²。

9. The refrigerator of claim 8, wherein: the air distribution distance between the air distribution plate and the stored articles is controlled to be more than or equal to 5 cm.

10. The refrigerator according to any one of claims 7 to 9, wherein: the air distribution holes form staggered air supply on the air distribution plate.

11. The refrigerator of claim 1, wherein: in the quick freezing stage, a strong cold air supply mode is carried out on the stored articles, so that cold air is directly blown to the stored articles to carry out forced convection heat exchange with the stored articles;

the strong cold air supply mode for the stored goods is realized by an air supply outlet arranged at the bottom or the side wall of the freezing chamber (1).

12. The refrigerator of claim 1, wherein: the pre-cooling stage adopts a shower type air supply mode and/or a strong cold air supply mode from top to bottom.

13. The refrigerator of claim 1, wherein: and the normal storage stage adopts a shower type air supply mode from top to bottom.

14. The refrigerator according to any one of claims 11 to 13, wherein: the first temperature is 0 ℃ to 5 ℃ inclusive, the freezing point temperature of the storage product is-5 ℃ to 0 ℃ inclusive, the third temperature is-10 ℃ to 0 ℃ inclusive, the fourth temperature is-10 ℃ to 3 ℃ inclusive, the T4 is to 3 ℃ inclusive, and the fifth temperature is-40 ℃ to 5 ℃ inclusive, T5 to 5 ℃ inclusive; the time 1h ≦ Δ t1 ≦ 6h, the time 0h ≦ Δ t2 ≦ 2h, the time 0h ≦ Δ t3 ≦ 4h, and the time 5h ≦ Δ td ≦ 8 h.

15. The refrigerator of claim 14, wherein: the rapid freezing stage adopts multi-stage cooling and comprises three stages: the first stage is as follows: the supercooling is firstly released in the time delta T4 so that the temperature of the stored goods is raised to the temperature T2; and a second stage: maintaining the temperature of the stored goods at T2 for a time Δ T5; and in the third stage, the temperature of the stored goods is reduced to T5 and maintained for delta T7 within delta T6 time.

16. The refrigerator of claim 15, wherein: the time is more than 0h and less than or equal to Δ t4 and less than or equal to 1h, the time is more than 0.5h and less than or equal to Δ t5 and less than or equal to 4h, the time is more than 0.5h and less than or equal to Δ t6 and less than or equal to 2h, and the time is more than or equal to 0h and less than or equal to Δ t7 and less than or equal to 2 h.

17. A control method of a refrigerator provided with a freezing chamber (1) for supercooling and freezing stored goods, characterized in that: the top of the freezing chamber (1) forms a static pressure mixing chamber (2), an air distribution plate is separated between the static pressure mixing chamber (2) and the freezing chamber (1), and air distribution holes are formed in the air distribution plate; the static pressure mixing cavity (2) is provided with a first air outlet (5), the lower part of the freezing chamber (1) is provided with a second air outlet (6), and the two air outlets are communicated with a cold air supply duct; the air supply duct is provided with an air duct reversing device (4) for controlling cold air of the air supply duct to flow to the first air outlet (5) and/or the second air outlet (6) so as to realize the change of an air supply mode at different stages in the freezing process of the stored articles;

the control method of the refrigerator comprises the following steps:

pre-cooling stage S1: the operation is started, the air outlet is not limited, the first air outlet and/or the second air outlet are/is opened as required to supply cold to the freezing chamber (1), and the stored goods to be frozen are cooled to a first temperature T1 which is not lower than the freezing point T2 of the stored goods within the time delta T1;

supercooling stage S2: when the temperature of the stored articles is reduced to a first temperature T1 which is not lower than the freezing point temperature T2 of the stored articles within the time delta T1, air is exhausted by adopting a first air outlet (5), so that the freezing chamber (1) is slowly cooled; when the temperature of the stored goods is slowly reduced to a fourth temperature T4 lower than the freezing point temperature T2 of the stored goods within the time delta T2, the freezing chamber (1) stops reducing the temperature and keeps stable for the time delta T3;

fast freeze phase S3: and (3) relieving supercooling, adopting air outlet of a second air outlet (6) to quickly cool the freezing chamber (1) and quickly freeze the stored articles, and cooling the stored articles from the fourth temperature T4 to the fifth temperature T5 within the time delta td: raising the temperature of the stored goods from T4 to T2 within the time delta T4; stopping cooling, stabilizing the temperature of the stored articles at T2, and maintaining for a time delta T5; decreasing the temperature of the stored items from T2 to a fifth temperature T5 for a time Δ T6 and maintaining for a time Δ T7;

normal save phase S4: the air is discharged from the first air outlet (5) to ensure that the temperature of the freezing chamber (1) is raised to a third temperature T3 which is higher than the fourth temperature T4 but lower than the freezing point temperature T2 of the stored goods; then, the temperature rise is stopped, and the temperature is stabilized at the third temperature T3, so that the stored goods are normally stored.

18. The control method of a refrigerator as claimed in claim 17, wherein: the first temperature is 0 ℃ to 5 ℃ inclusive, the freezing point temperature of the storage product is-5 ℃ to 0 ℃ inclusive, the third temperature is-10 ℃ to 0 ℃ inclusive, the fourth temperature is-10 ℃ to 3 ℃ inclusive, the T4 is to 3 ℃ inclusive, and the fifth temperature is-40 ℃ to 5 ℃ inclusive, T5 to 5 ℃ inclusive; the time is 1h or more and Δ t1 or more and 6h or more, the time is 0h or more and Δ t2 or more and 2h or more, the time is 0h or more and Δ t3 or more and 4h or more, the time is 0h or more and Δ t4 or more and 1h or more, the time is 0.5h or more and Δ t5 or more and 4h or more, the time is 0.5h or more and Δ t6 or more and 2h or less, the time is 0h or more and Δ t7 or more and 2h or more, and the time is 5h or more and Δ td or more and 8h or more.

19. The control method of a refrigerator as claimed in claim 18, wherein: the first temperature is 0 ℃ to 2 ℃ inclusive, the freezing point temperature of the storage is-3 ℃ to 1 ℃ inclusive, the third temperature is-7 ℃ to 3 ℃ to T3 to 5 ℃ inclusive, the fourth temperature is-7 ℃ to T4 to 5 ℃ inclusive, and the fifth temperature is-7 ℃ to T5 to 3 ℃ inclusive; the time 2h is less than or equal to Δ t1 is less than or equal to 4h, the time 1h is less than or equal to Δ t2 is less than or equal to 2h, the time 1h is less than or equal to Δ t3 is less than or equal to 2h, the time 0h is less than or equal to Δ t4 is less than or equal to 0.5h, the time 2h is less than or equal to Δ t5 is less than or equal to 3h, the time 1h is less than or equal to Δ t6 is less than or equal to 2h, the time 0h is less than or equal to Δ t7 is less than or equal to 1h, and the time 6h is less than or equal to Δ td.

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