Refrigeration system, refrigeration device and control method thereof

Abstract

The application provides a refrigeration system, a refrigeration device and a control method thereof, and the refrigeration system comprises a high-temperature stage and a low-temperature stage refrigeration cycle circuit, the high-temperature stage refrigeration cycle circuit comprises a high-temperature stage compressor, a high-temperature stage throttling device, an evaporation assembly and a high-temperature stage gas return pipe which are arranged in series, the evaporation assembly comprises a high-temperature stage evaporator and an evaporation part which are arranged in series, a first refrigerant flows in the high-temperature stage refrigeration cycle circuit, the first refrigerant flowing in the high-temperature stage throttling device exchanges heat with the first refrigerant flowing in the high-temperature stage gas return pipe; the low-temperature stage refrigeration cycle circuit comprises a low-temperature stage compressor and a condensation part, a second refrigerant flows in the low-temperature stage refrigeration cycle circuit, the second refrigerant flowing in the condensation part exchanges heat with the first refrigerant flowing in the evaporation part. The application can solve the problem that the existing refrigeration device cannot meet the classified storage of various food materials.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and in particular to a refrigeration system, a refrigeration device having the same, and a control method for the refrigeration device. Background Technology

[0002] With the improvement of economic level and the increasing convenience of transportation, cold chain transportation has emerged. Food ingredients from different regions and even different countries are gradually entering shopping malls and supermarkets and entering family dining tables. However, different ingredients can be stored for different lengths of time under different storage conditions, and even the freshness of ingredients will change with the change of storage conditions. Therefore, it is necessary to classify and store different types of ingredients.

[0003] The storage effect of different ingredients is mainly related to temperature, but existing refrigeration equipment only has storage rooms with a single temperature zone, which cannot meet the needs of storing various types of ingredients. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a refrigeration system, a refrigeration device having the same, and a control method for the refrigeration device, in order to solve the problem that existing refrigeration devices cannot meet the requirements for the classified storage of various types of food.

[0005] To achieve one of the above-mentioned objectives, one embodiment of the present invention provides a refrigeration system, comprising:

[0006] A high-temperature refrigeration cycle includes a high-temperature compressor, a high-temperature throttling device, an evaporation assembly, and a high-temperature return pipe connecting the evaporation assembly and the high-temperature compressor. The evaporation assembly includes a high-temperature evaporator and an evaporation section connected in series. A first refrigerant flows through the high-temperature refrigeration cycle, and the first refrigerant flowing through the high-temperature throttling device exchanges heat with the first refrigerant flowing through the high-temperature return pipe.

[0007] A low-temperature refrigeration cycle circuit includes a low-temperature compressor and a condenser section. A second refrigerant flows through the low-temperature refrigeration cycle circuit, and the second refrigerant flowing through the condenser section exchanges heat with a first refrigerant flowing through the evaporator section.

[0008] To achieve one of the above-mentioned objectives, one embodiment of the present invention also provides a refrigeration device, including a housing and a refrigeration system as described above. The housing has a first storage compartment and a second storage compartment. The high-temperature refrigeration cycle circuit supplies cooling to the first storage compartment, and the low-temperature refrigeration cycle circuit supplies cooling to the second storage compartment.

[0009] As a further improvement to one embodiment of the present invention, the refrigeration device further includes a controller, the controller being used for,

[0010] If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded.

[0011] If within a preset time t1, T1 drops to its preset shutdown temperature T 1关 Then determine whether T2 satisfies the first preset condition;

[0012] If so, then control the cryogenic stage compressor to start;

[0013] If not, then control the high-temperature stage compressor to shut down;

[0014] The first preset condition is: at this time T2≥T 2开 Alternatively, the preset shutdown temperature T of the second storage compartment at that moment. 2关 <T2<T 2开 And before that moment, T2 is always greater than T. 2关 .

[0015] As a further improvement to one embodiment of the present invention, the refrigeration device further includes a controller, the controller being used for,

[0016] If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded.

[0017] If, after a preset time t1, the temperature has not dropped to the preset shutdown temperature T of the first storage compartment, 1关 If T2 is below T2, then determine whether T2 satisfies the second preset condition.

[0018] If so, then control the cryogenic stage compressor to start;

[0019] If not, then restart the running time of the high-temperature stage compressor;

[0020] The second preset condition is: at this time T2≥T 2开 Or, at that moment T 2关 <T2<T 2开 And T2 is always greater than T within t1. 2关 .

[0021] As a further improvement to one embodiment of the present invention, the refrigeration device further includes a controller, the controller being used for,

[0022] If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded.

[0023] If, within a preset time t2, T2 drops to its preset shutdown temperature T...2关 If so, the cryogenic stage compressor is stopped, and it is determined whether T1 meets the third preset condition;

[0024] If not, then control the high-temperature stage compressor to shut down;

[0025] The third preset condition is: at this time T1≥T 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 is always greater than T. 1关 .

[0026] As a further improvement to one embodiment of the present invention, the refrigeration device further includes a controller, the controller being used for,

[0027] If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded.

[0028] If, after a preset time t2, the temperature has not dropped to the preset shutdown temperature T of the second storage compartment, 2关 If the time is below the specified value, the operating time of the cryogenic stage compressor will be reset.

[0029] To achieve one of the above-mentioned objectives, one embodiment of the present invention also provides a control method for a refrigeration device, the control method comprising:

[0030] If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded.

[0031] If within a preset time t1, T1 drops to its preset shutdown temperature T 1关 Then determine whether T2 satisfies the first preset condition;

[0032] If so, then control the cryogenic stage compressor to start;

[0033] If not, then control the high-temperature stage compressor to shut down;

[0034] The first preset condition is: at this time T2≥T 2开 Alternatively, the preset shutdown temperature T of the second storage compartment at that moment. 2关 <T2<T 2开 And before that moment, T2 is always greater than T. 2关 .

[0035] As a further improvement to one embodiment of the present invention, the control method further includes,

[0036] If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded.

[0037] If, after a preset time t1, the temperature has not dropped to the preset shutdown temperature T of the first storage compartment, 1关 If T2 is below T2, then determine whether T2 satisfies the second preset condition.

[0038] If so, then control the cryogenic stage compressor to start;

[0039] If not, then restart the running time of the high-temperature stage compressor;

[0040] The second preset condition is: at this time T2≥T 2开 Or, at that moment T 2关 <T2<T 2开 And T2 is always greater than T within t1. 2关 .

[0041] As a further improvement to one embodiment of the present invention, the control method further includes,

[0042] If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded.

[0043] If, within a preset time t2, T2 drops to its preset shutdown temperature T... 2关 If so, the cryogenic stage compressor is stopped, and it is determined whether T1 meets the third preset condition;

[0044] If not, then control the high-temperature stage compressor to shut down;

[0045] The third preset condition is: at this time T1≥T 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 is always greater than T. 1关 .

[0046] As a further improvement to one embodiment of the present invention, the control method further includes,

[0047] If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded.

[0048] If, after a preset time t2, the temperature has not dropped to the preset shutdown temperature T of the second storage compartment, 2关 If the time is below the specified value, the operating time of the cryogenic stage compressor will be reset.

[0049] Compared with the prior art, the present invention has the following beneficial effects: In the refrigeration system, refrigeration device, and control method of the refrigeration device of the present invention, when the first refrigerant flows in the high-temperature stage refrigeration cycle loop, the high-temperature stage evaporator cools the first storage compartment. The first refrigerant flowing through the evaporation section exchanges heat with the second refrigerant flowing through the condensation section. The first refrigerant in the evaporation section can absorb the heat of the second refrigerant flowing through the condensation section, thereby further reducing the temperature of the second refrigerant in the condensation section and pre-cooling the low-temperature stage refrigeration cycle loop, so that the low-temperature stage refrigeration cycle loop can achieve a lower temperature. The first refrigerant flowing through the high-temperature stage throttling device exchanges heat with the first refrigerant flowing through the high-temperature stage return pipe, thereby using the first refrigerant in the high-temperature stage return pipe to cool the first refrigerant in the high-temperature stage throttling device, increasing the cooling capacity, and raising the suction temperature of the high-temperature stage compressor to about the ambient temperature, thereby improving the refrigeration efficiency of the high-temperature stage compressor and the working efficiency of the high-temperature stage refrigeration cycle loop. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of a cascade compression refrigeration system according to an embodiment of the present invention.

[0051] Figure 2 This is a schematic diagram of the structure of a cascade compression refrigeration system according to another embodiment of the present invention. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings.

[0053] In the various illustrations of this invention, for ease of illustration, certain dimensions of structures or parts may be enlarged relative to other structures or parts; therefore, only the basic structure of the subject matter of this invention is used to illustrate the invention.

[0054] It should be understood that although the terms first, second, etc., may be used in this document to describe various elements or structures, the objects being described should not be limited by these terms. These terms are only used to distinguish these objects from one another.

[0055] A refrigeration device provided in one embodiment of the present invention includes a cabinet and a door. The cabinet has a storage compartment, and the door is used to open or close the storage compartment. The refrigeration device also includes a refrigeration system disposed in the cabinet and supplying cooling to the storage compartment. Specifically, the refrigeration device can be configured as a freezer, refrigerator, etc., to meet the needs of different users and different application scenarios.

[0056] In this embodiment, the cabinet has a first storage compartment and a second storage compartment. The first storage compartment can be a refrigerator compartment or a freezer compartment, and the second storage compartment can be a variable temperature compartment or a cryogenic compartment. The refrigeration system adopts a cascade compression refrigeration system 100, specifically including a high-temperature stage refrigeration cycle loop 1 and a low-temperature stage refrigeration cycle loop 2.

[0057] For ease of description, this embodiment uses the example of a high-temperature refrigeration cycle loop 1 cooling the first storage compartment and a low-temperature refrigeration cycle loop 2 cooling the second storage compartment. Of course, the two can be interchanged.

[0058] Of course, in other embodiments, other storage rooms besides the first and second storage rooms can be provided according to actual needs.

[0059] See Figure 1 and Figure 2 The high-temperature refrigeration cycle loop 1 includes a high-temperature compressor 11, a high-temperature throttling device 16, an evaporator assembly, and a high-temperature return pipe 13 connecting the evaporator assembly and the high-temperature compressor 11, all connected in series. The evaporator assembly includes a high-temperature evaporator 15 and an evaporation section 12, both connected in series. A first refrigerant flows through the high-temperature refrigeration cycle loop 1, exchanging heat with the first refrigerant flowing through the high-temperature throttling device 16 and the first refrigerant flowing through the high-temperature return pipe 13. Thus, the first storage compartment can achieve a temperature range of -30 to -10°C.

[0060] The low-temperature stage refrigeration cycle loop 2 includes a low-temperature stage compressor 22 and a condenser section 21. A second refrigerant flows through the low-temperature stage refrigeration cycle loop 2, and the second refrigerant flowing through the condenser section 21 exchanges heat with the first refrigerant flowing through the evaporator section 12.

[0061] In this way, when the first refrigerant flows in the high-temperature stage refrigeration cycle 1, the high-temperature stage evaporator 15 cools the first storage compartment. The first refrigerant flowing through the evaporation section 12 exchanges heat with the second refrigerant flowing through the condensation section 21. The first refrigerant in the evaporation section 12 can absorb the heat of the second refrigerant flowing through the condensation section 21, thereby further reducing the temperature of the second refrigerant in the condensation section 21, pre-cooling the low-temperature stage refrigeration cycle 2, so that the low-temperature stage refrigeration cycle 2 can achieve a lower temperature. The first refrigerant flowing through the high-temperature stage throttling device 16 exchanges heat with the first refrigerant flowing through the high-temperature stage return pipe 13, thereby using the first refrigerant in the high-temperature stage return pipe 13 to cool the first refrigerant in the high-temperature stage throttling device 16, increasing the cooling capacity, and raising the suction temperature of the high-temperature stage compressor 11 to about the ambient temperature, thereby improving the refrigeration efficiency of the high-temperature stage compressor 11 and improving the working efficiency of the high-temperature stage refrigeration cycle 1.

[0062] See Figure 1 Specifically, the high-temperature evaporator 15 is located between the high-temperature throttling device 16 and the evaporation section 12. In this way, the high-temperature evaporator 15 supplies cooling to the first storage chamber, and the first storage chamber has a high cooling efficiency. Afterward, the first refrigerant flows out from the high-temperature evaporator 15 to the evaporation section 12 and exchanges heat with the second refrigerant in the condensation section 21 to pre-cool the low-temperature refrigeration cycle loop 2.

[0063] See Figure 2 In other embodiments, the evaporator 12 can be located between the high-temperature evaporator 15 and the high-temperature return pipe 13. In this way, when the first refrigerant flows through the evaporator 12, it exchanges more cooling energy with the condenser 21, which can significantly reduce the temperature of the second refrigerant in the condenser 21, thereby enabling the low-temperature refrigeration cycle loop 2 to achieve a lower temperature. Afterward, the first refrigerant flows out from the evaporator 12 to the high-temperature evaporator 15 and provides cooling for the first storage compartment.

[0064] Preferably, the high-temperature throttling device 16 is a capillary tube.

[0065] The high-temperature stage throttling device 16 and the high-temperature stage return gas pipe 13 are thermally connected by interlocking or abutting each other to improve the heat exchange efficiency of the first refrigerant flowing between them and increase energy utilization.

[0066] Furthermore, the high-temperature refrigeration cycle loop 1 also includes a high-temperature drying filter 17 disposed between the high-temperature condenser 14 and the high-temperature throttling device 16, and a liquid storage tank 18 disposed between the high-temperature evaporator 15 and the high-temperature return gas pipe 13.

[0067] The low-temperature refrigeration cycle loop 2 includes a low-temperature compressor 22, a low-temperature throttling device 23, a low-temperature evaporator 24 and a first return gas pipe section 25 arranged in series, and a condenser section 21 is located between the low-temperature compressor 22 and the low-temperature throttling device 23.

[0068] Furthermore, the second refrigerant flowing through the first return gas pipe section 25 exchanges heat with the second refrigerant flowing through the low-temperature stage throttling device 23. This allows the second refrigerant flowing through the first return gas pipe section 25 to absorb the heat from the second refrigerant flowing through the low-temperature stage throttling device 23, increasing the temperature of the second refrigerant flowing to the suction inlet of the low-temperature stage compressor 22. This, in turn, increases the suction temperature of the low-temperature stage compressor 22, improves the energy utilization rate of the low-temperature stage refrigeration cycle loop 2, and enhances the overall energy efficiency of the refrigeration system.

[0069] Preferably, the low-temperature stage throttling device 23 is a capillary tube, and the first return gas pipe section 25 is connected to or attached to the low-temperature stage throttling device 23 to facilitate the heat exchange efficiency of the second refrigerant flowing between them and improve energy utilization.

[0070] Furthermore, the low-temperature refrigeration cycle 2 also includes a second return gas pipe section 26 and a heat release pipe section 27. The second return gas pipe section 26 is located between the low-temperature evaporator 24 and the low-temperature compressor 22, and the heat release pipe section 27 is located between the low-temperature compressor 22 and the condenser section 21. The second refrigerant flowing through the second return gas pipe section 26 exchanges heat with the second refrigerant flowing through the heat release pipe section 27. This allows the second refrigerant flowing through the second return gas pipe section 26 to absorb the heat of the second refrigerant flowing through the heat release pipe section 27, increasing the suction temperature of the low-temperature compressor 22 and reducing the amount of cooling energy of the second refrigerant flowing from the heat release pipe section 27 to the condenser section 21. This enables the low-temperature refrigeration cycle 2 to achieve a lower temperature, allowing the second storage compartment to be temperature-adjustable within the range of -60 to -20°C. It also improves the energy utilization rate of the low-temperature refrigeration cycle 2 and enhances the overall energy efficiency of the refrigeration system.

[0071] Preferably, the second return gas pipe section 26 is located between the first return gas pipe section 25 and the low-temperature stage compressor 22, which can maximize the energy utilization rate of the low-temperature stage refrigeration cycle loop 2.

[0072] The second return gas pipe section 26 and the heat release pipe section 27 are connected or attached to each other to facilitate the heat exchange efficiency of the second refrigerant flowing between them and improve energy utilization.

[0073] Furthermore, the low-temperature refrigeration cycle 2 also includes a low-temperature heat dissipation pipe 28 disposed between the low-temperature compressor 22 and the heat dissipation tube section 27, and a low-temperature dryer filter 29 disposed between the condenser section 21 and the low-temperature throttling device 23. The low-temperature heat dissipation pipe 28 dissipates heat from the second refrigerant flowing out of the low-temperature compressor 22, thereby enabling the low-temperature refrigeration cycle 2 to achieve a lower temperature; the low-temperature dryer filter 29 dries and filters the second refrigerant flowing out of the condenser section 21.

[0074] The first and second refrigerants can be the same refrigerant or different refrigerants.

[0075] In addition, "high temperature" and "low temperature" in "high temperature refrigeration cycle loop 1" and "low temperature refrigeration cycle loop 2" are relative terms. Relatively speaking, the evaporation temperature of the first refrigerant flowing through the high temperature refrigeration cycle loop 1 is higher than the evaporation temperature of the second refrigerant flowing through the low temperature refrigeration cycle loop 2.

[0076] Preferably, both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are variable frequency compressors, so that the operating frequency of the high-temperature stage compressor 11 and the low-temperature stage compressor 22 can be adjusted according to the temperature of different storage rooms, so that the high-temperature stage refrigeration cycle circuit 1 and the low-temperature stage refrigeration cycle circuit 2 can generate the cooling capacity required by their corresponding storage rooms, so as to avoid excessive operating pressure of the refrigeration system.

[0077] Furthermore, the refrigeration device also includes a controller, which is used for,

[0078] If the high-temperature stage compressor 11 is running and the low-temperature stage compressor 22 is stopped, then the running time of the high-temperature stage compressor 11 is recorded.

[0079] If within a preset time t1, T1 drops to its preset shutdown temperature T 1关 Then determine whether T2 satisfies the first preset condition;

[0080] If so, then control the cryogenic stage compressor 22 to start;

[0081] If not, then control the high-temperature stage compressor 11 to stop;

[0082] The first preset condition is: at this time T2≥T 2开 Alternatively, the preset shutdown temperature T of the second storage compartment at that moment. 2关 <T2<T 2开 And before that moment, T2 is always greater than T. 2关 .

[0083] In other words, if the high-temperature stage compressor 11 is running and the low-temperature stage compressor 22 is shut down, the running time of the high-temperature stage compressor 11 is timed, that is, the time for the high-temperature stage evaporator 15 to cool the first storage chamber is timed. During this process, the first refrigerant flowing through the evaporation section 12 exchanges heat with the second refrigerant flowing through the condensation section 21. The first refrigerant in the evaporation section 12 can absorb the heat of the second refrigerant flowing through the condensation section 21, thereby further reducing the temperature of the second refrigerant in the condensation section 21, pre-cooling the low-temperature stage refrigeration cycle loop 2. Within a preset time t1, if the temperature in the first storage chamber drops to its preset shutdown temperature and cooling is no longer required, the temperature of the second storage chamber is judged. If the temperature of the second storage chamber meets the first preset condition within the preset time t1, that is, the second storage chamber needs cooling, the low-temperature stage compressor 22 is controlled to start to cool the second storage chamber. Otherwise, it indicates that the second storage chamber does not need cooling, and the high-temperature stage compressor 11 can be shut down to save energy.

[0084] Preferably, t1 = 5 to 20 minutes. This time allows the evaporator 12 to provide sufficient cooling capacity to the low-temperature refrigeration cycle loop 2 in advance, while also preventing the second storage room from being uncooled for an extended period.

[0085] Furthermore, the controller is also used to,

[0086] If the high-temperature stage compressor 11 is running and the low-temperature stage compressor 22 is stopped, then the running time of the high-temperature stage compressor 11 is recorded.

[0087] If, after a preset time t1, the temperature has not dropped to the preset shutdown temperature T of the first storage compartment, 1关 Or below, and determine whether T2 satisfies the second preset condition;

[0088] If so, then control the cryogenic stage compressor 22 to start;

[0089] If not, then restart the running time of the high-temperature stage compressor 11;

[0090] The second preset condition is: at this time T2≥T 2关 Or, at that moment T 2关 <T2<T 2开 And within t1, T2 is always greater than T. 2关 .

[0091] In other words, after a preset time t1, if the temperature of the first storage compartment still has not dropped to its preset shutdown temperature or below, then it is first determined whether the temperature of the second storage compartment meets the second preset condition, that is, the start-up condition of the second storage compartment. If yes, it indicates that the second storage compartment needs cooling, and at this time, the low-temperature compressor 22 can be started to cool the second storage compartment, thereby enabling the second storage compartment to achieve a lower temperature; if no, it indicates that the second storage compartment does not need cooling, and at this time, the high-temperature compressor 11 can be controlled to continue running, and the running time of the high-temperature compressor 11 can be restarted. Within the preset time t1, it is detected in real time whether T1 drops to its preset shutdown temperature T. 1关 And it drops to its preset shutdown temperature T1. 1关 When T2 is in time, determine whether T2 satisfies the first preset condition.

[0092] Furthermore, the controller is also used to,

[0093] If both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are running, then the running time of the low-temperature stage compressor 22 is recorded.

[0094] If, within a preset time t2, T2 drops to its preset shutdown temperature T... 2关If so, the cryogenic stage compressor 22 is stopped, and it is determined whether T1 meets the third preset condition;

[0095] If not, then control the high-temperature stage compressor 11 to stop;

[0096] The third preset condition is: at this time T1≥T 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 is always greater than T. 1关 .

[0097] In other words, if both the high-temperature compressor 11 and the low-temperature compressor 22 are running, meaning both the first storage compartment and the second storage compartment are cooling, if the temperature of the second storage compartment drops to its preset shutdown temperature within a preset time t2, it indicates that the second storage compartment no longer needs cooling. At this time, the low-temperature compressor 22 can be shut down to save energy. Then, it is determined whether the first storage compartment meets the third preset condition to determine whether it still needs cooling. If not, the high-temperature compressor 11 is shut down to save energy.

[0098] Preferably, t2 = 5 to 40 minutes, which not only provides sufficient cooling to the second storage room to effectively reduce its temperature, but also prevents the first storage room from being uncooled for a long time.

[0099] Furthermore, the controller is also used to,

[0100] If both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are running, then the running time of the low-temperature stage compressor 22 is recorded.

[0101] If, after a preset time t2, the temperature has not dropped to the preset shutdown temperature T of the second storage compartment, 2关 If the time is below 22, the running time of the cryogenic compressor 22 will be reset.

[0102] In other words, if both the high-temperature compressor 11 and the low-temperature compressor 22 are running, that is, both the first storage compartment and the second storage compartment are cooling, and after a preset time t2, if the temperature of the second storage compartment still has not dropped to its preset shutdown temperature or below, then the running time of the low-temperature compressor 11 will be restarted so that the temperature of the second storage compartment drops to its preset temperature as soon as possible.

[0103] One embodiment of the present invention also provides a control method for the refrigeration device as described above, comprising,

[0104] If the high-temperature stage compressor 11 is running and the low-temperature stage compressor 22 is stopped, then the running time of the high-temperature stage compressor 11 is recorded.

[0105] If within a preset time t1, T1 drops to its preset shutdown temperature T 1关 Then determine whether T2 satisfies the first preset condition;

[0106] If so, then control the cryogenic stage compressor 22 to start;

[0107] If not, then control the high-temperature stage compressor 11 to stop;

[0108] The first preset condition is: at this time T2≥T 2开 Alternatively, the preset shutdown temperature T of the second storage compartment at that moment. 2关 <T2<T 2开 And before that moment, T2 is always greater than T. 2关 .

[0109] In other words, if the high-temperature stage compressor 11 is running and the low-temperature stage compressor 22 is shut down, the running time of the high-temperature stage compressor 11 is timed, that is, the time for the high-temperature stage evaporator 15 to cool the first storage chamber is timed. During this process, the first refrigerant flowing through the evaporation section 12 exchanges heat with the second refrigerant flowing through the condensation section 21. The first refrigerant in the evaporation section 12 can absorb the heat of the second refrigerant flowing through the condensation section 21, thereby further reducing the temperature of the second refrigerant in the condensation section 21, pre-cooling the low-temperature stage refrigeration cycle loop 2. Within a preset time t1, if the temperature in the first storage chamber drops to its preset shutdown temperature and cooling is no longer required, the temperature of the second storage chamber is judged. If the temperature of the second storage chamber meets the first preset condition within the preset time t1, that is, the second storage chamber needs cooling, the low-temperature stage compressor 22 is controlled to start to cool the second storage chamber. Otherwise, it indicates that the second storage chamber does not need cooling, and the high-temperature stage compressor 11 can be shut down to save energy.

[0110] Preferably, t1 = 5 to 20 minutes. This time allows the evaporator 12 to provide sufficient cooling capacity to the low-temperature refrigeration cycle loop 2 in advance, while also preventing the second storage room from being uncooled for an extended period.

[0111] Furthermore, the control method also includes,

[0112] If the high-temperature stage compressor 11 is running and the low-temperature stage compressor 22 is stopped, then the running time of the high-temperature stage compressor 11 is recorded.

[0113] If, after a preset time t1, the temperature has not dropped to the preset shutdown temperature T of the first storage compartment, 1关 Or below, and determine whether T2 satisfies the second preset condition;

[0114] If so, then control the cryogenic stage compressor 22 to start;

[0115] If not, then restart the running time of the high-temperature stage compressor 11;

[0116] The second preset condition is: at this time T2≥T 2关 Or, at that moment T 2关 <T2<T 2开 And within t1, T2 is always greater than T. 2关 .

[0117] In other words, after a preset time t1, if the temperature of the first storage compartment still has not dropped to its preset shutdown temperature or below, then it is first determined whether the temperature of the second storage compartment meets the second preset condition, that is, the start-up condition of the second storage compartment. If yes, it indicates that the second storage compartment needs cooling, and at this time, the low-temperature compressor 22 can be started to cool the second storage compartment, thereby enabling the second storage compartment to achieve a lower temperature; if no, it indicates that the second storage compartment does not need cooling, and at this time, the high-temperature compressor 11 can be controlled to continue running, and the running time of the high-temperature compressor 11 can be restarted. Within the preset time t1, it is detected in real time whether T1 drops to its preset shutdown temperature T. 1关 And when T1 drops to its preset shutdown temperature T 1关 When T2 is in time, determine whether T2 satisfies the first preset condition.

[0118] Furthermore, the control method also includes,

[0119] If both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are running, then the running time of the low-temperature stage compressor 22 is recorded.

[0120] If, within a preset time t2, T2 drops to its preset shutdown temperature T... 2关 If so, the cryogenic stage compressor 22 is stopped, and it is determined whether T1 meets the third preset condition;

[0121] If not, then control the high-temperature stage compressor 11 to stop;

[0122] The third preset condition is: at this time T1≥T 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 is always greater than T. 1关 .

[0123] In other words, if both the high-temperature compressor 11 and the low-temperature compressor 22 are running, meaning both the first storage compartment and the second storage compartment are cooling, if the temperature of the second storage compartment drops to its preset shutdown temperature within a preset time t2, it indicates that the second storage compartment no longer needs cooling. At this time, the low-temperature compressor 22 can be shut down to save energy. Then, it is determined whether the first storage compartment meets the third preset condition to determine whether it still needs cooling. If not, the high-temperature compressor 11 is shut down to save energy.

[0124] Preferably, t2 = 5 to 40 minutes, which not only provides sufficient cooling to the second storage room to effectively reduce its temperature, but also prevents the first storage room from being uncooled for a long time.

[0125] Furthermore, the control method also includes,

[0126] If both the high-temperature stage compressor 11 and the low-temperature stage compressor 22 are running, then the running time of the low-temperature stage compressor 22 is recorded.

[0127] If, after a preset time t2, the temperature has not dropped to the preset shutdown temperature T of the second storage compartment, 2关 If the time is below 22, the running time of the cryogenic compressor 22 will be reset.

[0128] In other words, if both the high-temperature compressor 11 and the low-temperature compressor 22 are running, that is, both the first storage compartment and the second storage compartment are cooling, and after a preset time t2, if the temperature of the second storage compartment still has not dropped to its preset shutdown temperature or below, then the running time of the low-temperature compressor 11 will be restarted so that the temperature of the second storage compartment drops to its preset temperature as soon as possible.

[0129] Compared with the prior art, the refrigeration system, refrigeration device, and control method of the refrigeration device provided by the present invention have the following advantages: When the first refrigerant flows in the high-temperature stage refrigeration cycle 1, the high-temperature stage evaporator 15 provides cooling for the first storage compartment. The first refrigerant flowing through the evaporation section 12 exchanges heat with the second refrigerant flowing through the condensation section 21. The first refrigerant in the evaporation section 12 can absorb the heat of the second refrigerant flowing through the condensation section 21, thereby further reducing the temperature of the second refrigerant in the condensation section 21, pre-cooling the low-temperature stage refrigeration cycle 2, so that the low-temperature stage refrigeration cycle 2 can achieve a lower temperature. The first refrigerant flowing through the high-temperature stage throttling device 16 exchanges heat with the first refrigerant flowing through the high-temperature stage return pipe 13, thereby using the first refrigerant in the high-temperature stage return pipe 13 to cool down the first refrigerant in the high-temperature stage throttling device 16, increasing the cooling capacity, and raising the suction temperature of the high-temperature stage compressor 11 to about the ambient temperature, thereby improving the refrigeration efficiency of the high-temperature stage compressor 11 and improving the working efficiency of the high-temperature stage refrigeration cycle 1.

[0130] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0131] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A refrigeration device, comprising a housing and a refrigeration system, characterized in that, The refrigeration system includes: A high-temperature refrigeration cycle includes a high-temperature compressor, a high-temperature throttling device, an evaporator assembly, and a high-temperature return pipe connecting the evaporator assembly and the high-temperature compressor, all connected in series. The evaporator assembly includes a high-temperature evaporator and an evaporation section connected in series. A first refrigerant flows through the high-temperature refrigeration cycle, and the first refrigerant flowing through the high-temperature throttling device exchanges heat with the first refrigerant flowing through the high-temperature return pipe. A low-temperature stage refrigeration cycle circuit includes a low-temperature stage compressor and a condenser section. A second refrigerant flows through the low-temperature stage refrigeration cycle circuit, and the second refrigerant flowing through the condenser section exchanges heat with the first refrigerant flowing through the evaporator section. The enclosure has a first storage compartment and a second storage compartment. The high-temperature refrigeration cycle circuit supplies cooling to the first storage compartment, and the low-temperature refrigeration cycle circuit supplies cooling to the second storage compartment. The refrigeration system further includes a controller, the controller being used for: If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded. If the temperature T1 inside the first storage room drops to its preset shutdown temperature T within a preset time t1, 1关 Then determine whether the temperature T2 of the second storage room meets the first preset condition; If so, then control the cryogenic stage compressor to start; If not, then control the high-temperature stage compressor to shut down; The first preset condition is: at this time T2≥T 2开 Alternatively, the preset shutdown temperature T of the second storage compartment at that moment. 2关 <T2<T 2开 And before that moment, T2 is always greater than T. 2关 .

2. The refrigeration device according to claim 1, characterized in that, The controller is used for, If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded. If, after a preset time t1, the temperature has not dropped to the preset shutdown temperature T of the first storage compartment, 1关 If T2 is below T2, then determine whether T2 satisfies the second preset condition. If so, then control the cryogenic stage compressor to start; If not, then restart the running time of the high-temperature stage compressor; The second preset condition is: at this time T2≥T 2开 Or, at that moment T 2关 <T2<T 2开 And T2 is always greater than T within t1. 2关 .

3. The refrigeration device according to claim 1, characterized in that, The controller is used for, If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded. If, within a preset time t2, T2 drops to its preset shutdown temperature T... 2关 If so, the cryogenic stage compressor is stopped, and it is determined whether T1 meets the third preset condition; If not, then control the high-temperature stage compressor to shut down; The third preset condition is: at this time T1≥T 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 is always greater than T. 1关 .

4. The refrigeration device according to claim 1, characterized in that, The controller is used for, If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded. If, after a preset time t2, the temperature has not dropped to the preset shutdown temperature T of the second storage compartment, 2关 If the time is below the specified value, the operating time of the cryogenic stage compressor will be reset.

5. A control method for a refrigeration device as described in claim 1, characterized in that, The control method includes, If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded. If within a preset time t1, T1 drops to its preset shutdown temperature T 1关 Then determine whether T2 satisfies the first preset condition; If so, then control the cryogenic stage compressor to start; If not, then control the high-temperature stage compressor to shut down; The first preset condition is: at this time T2≥T 2开 Alternatively, the preset shutdown temperature T of the second storage compartment at that moment. 2关 <T2<T 2开 And before that moment, T2 is always greater than T. 2关 .

6. The control method for the refrigeration device according to claim 5, characterized in that, The control method also includes, If the high-temperature stage compressor is running and the low-temperature stage compressor is stopped, then the running time of the high-temperature stage compressor is recorded. If, after a preset time t1, the temperature has not dropped to the preset shutdown temperature T of the first storage compartment, 1关 If T2 is below T2, then determine whether T2 satisfies the second preset condition. If so, then control the cryogenic stage compressor to start; If not, then restart the running time of the high-temperature stage compressor; The second preset condition is: at this time T2≥T 2开 Or, at that moment T 2关 <T2<T 2开 And T2 is always greater than T within t1. 2关 .

7. The control method for the refrigeration device according to claim 5, characterized in that, The control method also includes, If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded. If, within a preset time t2, T2 drops to its preset shutdown temperature T... 2关 If so, the cryogenic stage compressor is stopped, and it is determined whether T1 meets the third preset condition; If not, then control the high-temperature stage compressor to shut down; The third preset condition is: at this time T1≥T 1开 Or, the preset shutdown temperature T of the first storage compartment at that moment. 1关 <T1<T 1开 And before that moment, T1 is always greater than T. 1关 .

8. The control method for the refrigeration device according to claim 5, characterized in that, The control method also includes, If both the high-temperature stage compressor and the low-temperature stage compressor are running, then the running time of the low-temperature stage compressor is recorded. If, after a preset time t2, the temperature has not dropped to the preset shutdown temperature T of the second storage compartment, 2关 If the time is below the specified value, the operating time of the cryogenic stage compressor will be reset.

Images