Food material	430MHz	900MHz	2450MHz
				Raw pork	4.7cm	2.2cm	0.8cm
Raw beef	4.9cm	2.3cm	0.9cm
				Cooked beef	6.5cm	3.1cm	1.2cm
Cod fish	6.9cm	3.3cm	1.2cm
				Mashed potato	4.0cm	1.9cm	0.7cm
Carrot (carrot)	5.2cm	2.5cm	0.9cm

It can be seen that the smaller electromagnetic wave penetration depth of 430MHz frequency is more suitable for thawing high-weight and large-volume food between the frequencies 430MHz,900MHz and 2450 MHz. The radio frequency of the radio frequency thawing device provided by the embodiment of the invention radiated into the thawing cavity is 380 MHz-480 MHz, the radio frequency thawing device has good penetrability on food in the thawing process, and the inside and the outside of the food can be uniformly heated at the same time, so that the inside and the outside of the thawed food can be heated stably, the food can be thawed quickly, the juice is extremely less lost, and the color is less.

In daily life, the ideal stop temperature for thawing is generally considered to be between-4 and 0 ℃, meat thawed in the temperature range is easy to cut, juice is rarely lost, and discoloration is little. In a specific experimental process, thawing 3.5kg of beef at-18 ℃ by using various thawing methods and microwave ovens with different powers, and taking the temperature rise of the center of meat stuffing to 0 ℃ as a standard for judging the thawing completion, so as to obtain the test results in the following table 2:

TABLE 2

In table 2, the thawing time is an average value obtained from a plurality of tests, and the temperature difference is a temperature difference between the ambient temperature of the thawed food and the inside of the thawed food during thawing. Specifically, the temperature of the thawed food is monitored in real time through an infrared temperature measuring device.

According to the experimental results, the radio frequency thawing device provided by the embodiment of the invention has strong radio frequency penetrating power to thaw food, and can be used for uniformly heating the interior and the exterior of food. In the defrosting process, the power radiated into the defrosting cavity is in the range of 200W to 1000W, the defrosting time is short, no juice flows out in the defrosting process, the defrosting efficiency is high, the nutritional ingredients of food cannot be damaged after defrosting, particularly, the surface of the defrosted meat is free from obvious whitening, and the mouthfeel of the defrosted meat is guaranteed.

In some alternative embodiments, as shown in fig. 2, the radio frequency thawing device further comprises apower detection unit 41 and apower adjustment unit 51.

Thepower detection unit 41 is disposed between the defrosting cavity and the housing, and is configured to detect an incident power of the radio frequency and a reflected power reflected by the defrosting cavity.

Thepower adjusting unit 51 is connected to therf source 1, and is configured to adjust the power of therf source 1 for transmitting the rf according to the incident power and the reflected power.

When the quality of the thawed food is smaller, the radio frequency absorption ratio is smaller, and the condition of high reflection power is easy to occur. The reflected power is large, and there is a risk of damaging the rf amplifier, and thepower adjusting unit 51 is connected to therf source 1 to reduce the transmission power of therf source 1 or stop transmitting the rf.

In some alternative embodiments, as shown in fig. 3, the rf thawing apparatus further comprises apower detection unit 42 and apower adjustment unit 52.

Thepower detection unit 42 is disposed between the defrosting cavity and the housing, and is configured to detect an incident power of the radio frequency and a reflected power reflected by the defrosting cavity.

Thepower adjusting unit 52 is connected to therf power amplifier 2, and is configured to adjust the power of the rf amplified by therf power amplifier 2 according to the incident power and therf power amplifier 2.

When the quality of the thawed food is smaller, the radio frequency absorption ratio is smaller, and the condition of high reflection power is easy to occur. The reflected power is high, and there is a risk of damaging the rf amplifier, and thepower adjusting unit 52 is connected to therf power amplifier 2 to reduce the amplification factor of the rf power by therf power amplifier 2.

In some alternative embodiments, the number ofradio frequency antennas 3 is two or more. The larger the volume of the rf thawing device, the more the number ofrf antennas 3. The plurality ofradio frequency antennas 3 enable electromagnetic wave energy generated by radio frequency to be radiated to food to be defrosted more uniformly, so that defrosting duration is shortened, and defrosting efficiency is improved.

In some alternative embodiments, when the number of therf antennas 3 is two or more, a grounding baffle is disposed betweenadjacent rf antennas 3 in order to prevent therf antennas 3 from absorbing the rf radiated byother rf antennas 3. The partition plate prevents theradio frequency antenna 3 from absorbing radio frequencies radiated by otherradio frequency antennas 3, prolongs the service life of theradio frequency antenna 3, improves the utilization rate of electromagnetic wave energy and improves the thawing efficiency.

Wherein, the material of the baffle is the same as the material of the inner wall of the thawing cavity. The material of the baffle plate and the material of the inner wall of the thawing cavity are stainless steel. Avoiding the influence of heating cavity rust and the like on the service life of the heat relieving device caused by water drops and the like carried by heated food. In some alternative embodiments, the baffle may be provided on the thawing chamber inner wall by an integral molding process. The gap between the partition plate and the inner wall of the thawing cavity is avoided, theradio frequency antenna 3 absorbs radio frequencies radiated by otherradio frequency antennas 3, and the utilization rate of electromagnetic wave energy is reduced. In some alternative embodiments, the baffle may be disposed on the inner wall of the defrosting chamber by a welding process to improve the stability of the baffle.

In some alternative embodiments, the smooth transition connection between adjacent side walls of the thawing chamber is used to avoid the accumulation of radio frequency in the range of the included angle between the adjacent side walls, which results in local over-high temperature and reduced thawing quality for food.

In some alternative embodiments, the rf thawing apparatus further comprises: a heat radiation fan. An air inlet and an air outlet are arranged on the shell, and a heat dissipation fan is arranged between the defrosting cavity and the shell. In the thawing process, the temperature of the radiofrequency power amplifier 2 is continuously increased in the process of amplifying the radio frequency power by the radiofrequency power amplifier 2, and the radiofrequency power amplifier 2 is greatly lost and the working efficiency is reduced along with the increase of the temperature. And the cooling fan is used for cooling the radiofrequency power amplifier 2, so that the defrosting efficiency is improved, the loss of the radiofrequency power amplifier 2 is reduced, and the service life of the radio frequency defrosting device is prolonged.

Wherein, in order to reduce the loss of radio frequency in the propagation process in the heating cavity, theradio frequency antenna 3 is arranged on the inner wall of the bottom of the defrosting cavity. In order to reduce the length of the connecting line between theradio frequency antenna 3 and the radiofrequency power amplifier 2, the radiofrequency power amplifier 2 is arranged between the bottom of the thawing chamber and the housing. In order to accelerate the cooling rate of the radiofrequency power amplifier 2, a heat radiation fan is arranged between the bottom of the defrosting cavity and the shell.

In some alternative embodiments, in order to facilitate real-time inspection of the thawed food in the thawing chamber, electromagnetic wave leakage is avoided, and glass is embedded in the door body of the radio frequency thawing device. Because the penetrating power of the radio frequency is stronger, the damage of the radio frequency penetrating the glass to the human body is avoided, and the glass is wire glass.

In some optional embodiments, an elastic sealing structure is adopted between the door body of the radio frequency thawing device and the radio frequency thawing cavity, so that electromagnetic leakage possibly caused by processing errors and assembly errors of the door body and the cavity is compensated, and the safety of the radio frequency thawing device is improved.

In the embodiments disclosed herein, it should be understood that the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

It should be appreciated that the flow charts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. The invention is not limited to the flow and structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A radio frequency thawing apparatus comprising: thawing chamber, shell and radio frequency source, its characterized in that still includes: a radio frequency power amplifier and a radio frequency antenna;

the radio frequency source and the radio frequency power amplifier are arranged between the defrosting cavity and the shell; the radio frequency source is connected with the radio frequency power amplifier and is used for amplifying radio frequency power generated by the radio frequency source to set power; the set power range is 450W to 1000W;

the radio frequency antenna is arranged on the inner wall of the thawing cavity; the radio frequency antenna is connected with the radio frequency power amplifier and is used for radiating radio frequency generated by the radio frequency source into the defrosting cavity; the radio frequency radiated into the thawing cavity is 380 MHz-430 MHz;

the radio frequency thawing device further comprises: a power detection unit and a power adjustment unit;

the power adjusting unit is connected with the radio frequency power amplifier and is used for adjusting the power of the radio frequency amplified by the radio frequency power amplifier according to the incident power and the radio frequency power amplifier;

the number of the radio frequency antennas is two or more;

the radio frequency thawing device further comprises: the material of the partition plate is the same as that of the inner wall of the defrosting cavity, the material of the partition plate and the material of the inner wall of the defrosting cavity are stainless steel, the partition plate is arranged on the inner wall of the defrosting cavity through an integrated process, and the adjacent side walls of the defrosting cavity are connected in a smooth transition manner;

the radio frequency thawing device further comprises: a door body provided with wire inserting glass in an embedded manner; an elastic sealing structure is adopted between the door body of the radio frequency thawing device and the radio frequency thawing cavity.

2. The radio frequency thawing device as defined in claim 1, further comprising: a power detection unit and a power adjustment unit;

3. The radio frequency thawing device as defined in claim 1, further comprising: the heat radiation fan is arranged between the defrosting cavity and the shell;

an air inlet and an air outlet are arranged on the shell.

4. The rf thawing device as in claim 3, wherein the heat sink fan, and the rf power amplifier are disposed between the thawing chamber bottom and the housing.

5. The rf thawing device as in claim 4, wherein the rf antenna is disposed on an inner wall of the thawing chamber bottom.