CN201964703U - Energy adjusting device of refrigerating unit and refrigerating system - Google Patents

Abstract

The utility model discloses an energy adjusting device and refrigerating system of refrigerating unit. The energy adjusting device of the refrigerating unit comprises an air suction adjusting device, and the air suction adjusting device is arranged on the air suction side of the refrigerating unit and used for controlling air suction of the refrigerating unit. Through the utility model discloses, the problem that refrigerating system's temperature control accuracy is lower among the correlation technique has been solved.

Description

Energy of Refrigerating Units adjusting device and refrigeration system

Technical field

The utility model relates to field of air conditioning, in particular to a kind of Energy of Refrigerating Units adjusting device and refrigeration system.

Background technology

In the exploitation of container air-conditioning; quality for transportation goods in the guard box; usually require to realize the accurate control of unit leaving air temp; required precision can reach ± and 0.2 ℃; and refrigeration system adopts is to decide the frequency screw compressor, can't satisfy required precision with traditional startup-shutdown control mode.

At the lower problem of the temperature control accuracy of refrigeration system in the correlation technique, effective solution is not proposed as yet at present.

The utility model content

Propose the utility model at the lower problem of the temperature control accuracy of refrigeration system in the correlation technique, for this reason, main purpose of the present utility model is to provide a kind of Energy of Refrigerating Units adjusting device and refrigeration system, to address the above problem.

To achieve these goals, according to an aspect of the present utility model, provide a kind of Energy of Refrigerating Units adjusting device.This Energy of Refrigerating Units adjusting device comprises the suction modulation device, and this suction modulation device is arranged at the suction side of refrigeration unit, is used to control the air-breathing of refrigeration unit.

Further, the aperture scope of suction modulation device be (2%, 100%].

Further, this Energy of Refrigerating Units adjusting device also comprises controller, is used to control the aperture of suction modulation device.

Further, controller also is used to obtain the load value of refrigeration unit, and control the ability output of refrigeration unit so that the ability output of refrigeration unit is consistent with load value by the aperture of control suction modulation device, wherein, the output of the ability of refrigeration unit is corresponding with the opening value of suction modulation device.

Further, the ability output area of refrigeration unit be (20%, 100%].

Further, controller also is used for by pid algorithm load value being converted into the opening value of suction modulation device.

To achieve these goals, according on the other hand of the present utility model, provide a kind of refrigeration system.This refrigeration system comprises any one above-mentioned Energy of Refrigerating Units adjusting device.

Pass through the utility model, adopt above-mentioned any one Energy of Refrigerating Units adjusting device and refrigeration system, solved the lower problem of temperature control accuracy of refrigeration system in the correlation technique, and then the temperature that has reached refrigeration system realizes the accurately effect of control.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:

Fig. 1 is the schematic diagram according to the refrigeration system of the utility model embodiment;

Fig. 2 is the schematic diagram according to first embodiment of the design factor of the aperture of definite suction modulation device of the present utility model;

Fig. 3 is the schematic diagram according to second embodiment of the design factor of the aperture of definite suction modulation device of the present utility model;

Fig. 4 is the schematic diagram according to the 3rd embodiment of the design factor of the aperture of definite suction modulation device of the present utility model;

Fig. 5 is the schematic diagram according to the 4th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model;

Fig. 6 is the schematic diagram according to the 5th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model;

Fig. 7 is the schematic diagram according to the 6th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model;

Fig. 8 is the schematic diagram according to the 7th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model; And

Fig. 9 is the schematic diagram according to the temperature controlled effect of the utility model embodiment.

The specific embodiment

Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.

Fig. 1 is the schematic diagram according to the refrigeration system of the utility model embodiment.As shown in Figure 1, this refrigeration system comprises asuction modulation device 10, and thissuction modulation device 10 is used to control the inspiratory capacity of refrigeration unit.

As shown in Figure 1, this refrigeration system can also compriseevaporimeter 12,throttling arrangement 14,condenser 16 andcompressor 18.

According to the utility model embodiment, a kind of Energy of Refrigerating Units adjusting device also is provided, this Energy of Refrigerating Units adjusting device comprises the suction modulation device, this suction modulation device is arranged at the suction side of refrigeration unit, is used to control the air-breathing of refrigeration unit.

Wherein, the aperture of this suction modulation device is adjustable, and degree of regulation can be 0.1%.

This suction modulation device has a minimal adjustment aperture Kmin, more than the opening value, needs to guarantee that unit normally moves at this.During suction modulation device aperture standard-sized sheet, this device should not produce bigger resistance to the gas flow of unit suction side.For example, [Kmin, 100%] is the work aperture scope of suction modulation device, preferably, the span of Kmin be (2%, 100%].

The output of the opening value of suction modulation device and the ability of refrigeration unit is corresponding one by one, and the corresponding unit minimum ability of minimum aperture K is exported Q0, and the controllable ability output area of unit is: [Q0,100%], preferably, the span of Q0 be (20%, 100%].

In the utility model embodiment, provide and utilize the suction modulation device that the inspiratory capacity of refrigeration unit is accurately controlled, thereby accurately control the ability output of unit, the coupling preferably that makes it and load plays the purpose of accurate control temperature.

Preferably, this Energy of Refrigerating Units adjusting device also comprises controller, is used to control the aperture of suction modulation device.

Preferably, controller also is used to obtain the load value of refrigeration unit, and control the ability output of refrigeration unit so that the ability output of refrigeration unit is consistent with load value by the aperture of control suction modulation device, wherein, the output of the ability of refrigeration unit is corresponding with the opening value of suction modulation device.Wherein, the ability output area of refrigeration unit can for (20%, 100%].

Preferably, controller also is used for by pid algorithm load value being converted into the opening value of suction modulation device.For example, come to obtain the opening value of suction modulation device: Kn=Mp* (Δ Tn-Δ Tn-1)+Mi* Δ Tn+Md (Δ Tn-2 Δ Tn-1+ Δ Tn-2)+Kn-1 in the following manner according to load value, wherein, Mp, Mi, Md are constant, and Δ Tn is the n time temperature deviation that calculates.

According to the utility model embodiment, a kind of Energy of Refrigerating Units control method also is provided, in the energy adjustment method of this cold unit, control the ability output of refrigeration unit by the inspiratory capacity of control refrigeration unit.

Preferably, the ability output of controlling refrigeration unit by the inspiratory capacity of control refrigeration unit may further comprise the steps:

Step S1 obtains the load value of refrigeration unit.

For example, according to the load value that the control temperature and the target temperature of refrigeration unit obtains refrigeration unit, wherein, the span of target temperature is: (10 ℃ ,+25 ℃).

Preferably, the suction modulation device control refrigeration unit of suction side that can be by being arranged at refrigeration unit air-breathing, wherein, after obtaining the load value of refrigeration unit, the Energy of Refrigerating Units control method also comprises: the opening value that obtains the suction modulation device according to load value.

Come to obtain according to load value the opening value of suction modulation device: Kn=Mp* (Δ Tn-Δ Tn-1)+Mi* Δ Tn+Md (Δ Tn-2 Δ Tn-1+ Δ Tn-2)+Kn-1 in the following manner, wherein, Mp, Mi, Md are constant, and Δ Tn is the n time temperature deviation that calculates.

The load value that obtains refrigeration unit can comprise:

The control temperature of refrigeration unit is T, and target temperature is T0, and Δ T=T-T0 has reflected the payload of unit.

T represents the cargo temperature in the container, by the return air temperature probe measurement of unit, and the refrigeration operating mode, the span of T is (10 ℃ ,+25 ℃).

T0 represents the target temperature that expectation reaches in the container, and the temperature after the temperature inside the box balance, the span of T0 are (10 ℃ ,+25 ℃).

Δ T=T-T0 has reflected the payload of unit, and Δ T is big more, represents that the temperature departure target temperature in the present case is far away, need bigger refrigerating capacity, Δ T hour, expression the temperature inside the box only needs a less load just can satisfy refrigeration near target temperature.

Step S2 controls the ability output of refrigeration unit so that the ability output of refrigeration unit is consistent with load value by the inspiratory capacity of control refrigeration unit.

Below to the opening value Kn that payload is converted into the suction modulation device being specifically described by pid algorithm:

This pid algorithm is:

Kn＝Mp*(ΔTn-ΔTn-1)+Mi*ΔTn+Md(ΔTn-2ΔTn-1+ΔTn-2)+Kn-1

Wherein, Mp, Mi, Md are coefficient, and span does not have specific (special) requirements, can determine as required.

Δ Tn is the n time temperature deviation that calculates, and Δ Tn-1 is the n-1 time temperature deviation that calculates, and Δ Tn-2 is the n-2 time temperature deviation that calculates.

When n=1, there are not Δ Tn-1 and Δ Tn-2; When n=2, there is not Δ Tn-2, above-mentioned formula can't calculate, and needs the aperture K1 and the K2 of suction modulation device are composed initial value, and the corresponding unit fan-out capability of opening value K1 is 75%, and the corresponding unit fan-out capability of opening value K2 is 50%.

Three parameters of Mp, Mi and Md need be determined by experiment, and generally can follow following steps:

(a), supposition Mi=0, Md=0, and suppose a Mp initial value, according to unit practical adjustments situation, Mp initial value＜5, algorithm was reduced to a simple P and regulated this moment.The data of test control temperature T t variation in time, choosing of time t should be at least more than 2 times of sampling time.Draw out the T-t curve according to test data, judge according to the relation of control temperature T and target temperature T0 in the T-t curve and choose suitable Mp value.

Fig. 2 is the schematic diagram according to first embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.When Mp hour, have bigger static deviation between the control time dependent T-t curve of temperature and the target temperature T0, when static deviation numerical value above 1.5 the time, think that the Mp value is less than normal.

Fig. 3 is the schematic diagram according to second embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.When Mp was big, the time dependent T-t curve of control temperature can intersect rapidly with target temperature T0 straight line, andwide temperature T 0 straight line gradually.

Fig. 4 is the schematic diagram according to the 3rd embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.When Mp is suitable, the time dependent T-t curve meeting of control temperature convergence target temperature T0 straight line, and keep certain static deviation, and to regulate for P, static deviation can not be eliminated.Static deviation numerical value is 0.3---between 0.7, can think that Mp is suitable.

Fig. 5 is the schematic diagram according to the 4th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.(b), according to the suitable Mp value of determining in (a), and supposition Md=0 supposes an initial Mi value, according to unit practical adjustments situation, the Mi initial value can be chosen between the 20%-50% of Mp value, algorithm is reduced to the PI adjusting at this moment.The data of test control temperature T t variation in time, choosing of time t should be at least more than 2 times of sampling time.Draw out the T-t curve according to test data, judge according to the relation of control temperature T and target temperature T0 in the T-t curve and choose suitable Mi value.At this moment, temperature is shaken near desired value.

Fig. 6 is the schematic diagram according to the 5th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.At this moment, when Mi was less than normal, storage effect was not obvious, still can have bigger static deviation, when static deviation numerical value greater than 0.3, think that the Mi value is less than normal.

Fig. 7 is the schematic diagram according to the 6th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.At this moment, when Mi was bigger than normal, storage effect can make the adjusting bad stability, and the adjusting time is elongated, when the T-t curve vibrates near target temperature T0, thought that the Mi value is bigger than normal.

Fig. 8 is the schematic diagram according to the 7th embodiment of the design factor of the aperture of definite suction modulation device of the present utility model.At this moment, when Mi was suitable, the T-t curve is convergence target temperature T0 gradually.

(c), determine Mp and Mi value, suppose initial Md value, the Md initial value can be chosen between the 50%-70% of Mp value, and algorithm is the PID adjusting at this moment according to (a) with (b).The data of test control temperature T t variation in time, choosing of time t should be at least more than 2 times of sampling time.Draw out the T-t curve according to test data, judge according to the relation of control temperature T and target temperature T0 in the T-t curve and choose suitable Md value.

When Md is less than normal, the differential DeGrain, the adjusting process can obviously not accelerated.Improve if the stable time of T-t curve adjustment is compared with the PI algorithm not have obviously, think that then Md is less than normal.

When Md was bigger than normal, it is frequent that the differential effect can cause controlling temperature fluctuation.If the T-t curve adjustment is frequently vibrated, think that then Md is bigger than normal.

When Md is suitable, should be able to regulate stablely fast, and effectively reduce static difference, make degree of regulation satisfy ± 0.25 ℃ requirement.

Realize the adjustment in the relative broad range if desired, can carry out segment processing to Mp, Mi and Md, promptly adopt different adjustment factor values, to guarantee the property quick and precisely of regulating effect in different intervals according to actual conditions.

By the suction modulation device inspiratory capacity of refrigeration unit is accurately controlled, thereby the accurate output of control unit capacity realizes that finally temperature control precision is ± 0.2 ℃.

Below be one group of test data:

Fig. 9 is the schematic diagram according to the temperature controlled effect of the utility model embodiment.As seen from the figure, by adopting Energy of Refrigerating Units control method and the device of the utility model embodiment, perhaps refrigeration system can reach the purpose of accurate control unit leaving air temp.

Increase an aperture adjustable device by suction end, the inspiratory capacity of unit is accurately controlled, the fan-out capability of unit and load are complementary, reach the purpose of accurate control unit leaving air temp at unit.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (5)

1. an Energy of Refrigerating Units adjusting device is characterized in that, comprises the suction modulation device, and this suction modulation device is arranged at the suction side of described refrigeration unit, is used to control the air-breathing of described refrigeration unit.

2. Energy of Refrigerating Units adjusting device according to claim 1 is characterized in that, the aperture scope of described suction modulation device be (2%, 100%].

3. Energy of Refrigerating Units adjusting device according to claim 1 is characterized in that, also comprises:

Controller is used to control the aperture of described suction modulation device.

4. Energy of Refrigerating Units adjusting device according to claim 3 is characterized in that, the ability output area of described refrigeration unit be (20%, 100%].

5. a refrigeration system is characterized in that, comprises each described Energy of Refrigerating Units adjusting device in the claim 1 to 4.

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