Refrigerator-freezer device

Abstract

The application provides a refrigerating and freezing device. The refrigerating and freezing device comprises a cabinet, a refrigerating system and a heating unit. The cabinet defines at least one storage compartment. The refrigerating system comprises a compressor, a condenser communicated with a refrigerant outlet of the compressor, at least one throttling element communicated with a refrigerant outlet of the condenser, and a first evaporator communicated with a refrigerant outlet of the throttling element to provide cold energy to the at least one storage compartment. The heating unit is arranged to generate heat for heating objects to be treated in or in part of the at least one storage compartment. The refrigerating system further comprises a heat dissipation pipeline. The heat dissipation pipeline is arranged to be communicated with the first evaporator at one end and with the compressor at the other end, and to exchange heat with at least part of the heating unit to exchange the remaining cold energy of the evaporator with the heating unit, so that the heat dissipation of the heating unit can be quickly and effectively realized without setting additional heat dissipation devices, and the production cost and working energy consumption are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration or cooling, and in particular to a refrigeration and freezing device with a heating unit. BACKGROUND

[0002] There are some refrigeration and freezing devices with a heating unit in the prior art, which can quickly thaw food or reduce condensation and frost. However, when the heating unit is working, some electrical components of the heating unit generate a large amount of heat, which not only affects the use of the surrounding environment, but also affects the thawing and defrosting effect, the continuous working time of the heating unit, and the service life of the heating electrical components.

[0003] In view of the above, it is necessary to design a refrigeration and freezing device which can effectively dissipate heat from the heating electrical components and does not affect the preservation effect. SUMMARY

[0004] An object of the present application is to overcome at least one technical defect in the prior art, and to provide a refrigeration and freezing device with a heating unit, which can effectively dissipate heat from the heating electrical components of the heating unit.

[0005] A further object of the present application is to reduce energy consumption.

[0006] Another further object of the present application is to ensure the heat dissipation effect of the heating unit and the refrigeration effect of the storage compartment.

[0007] In particular, the present application provides a refrigeration and freezing device, comprising:

[0008] a cabinet defining at least one storage compartment;

[0009] a refrigeration system comprising a compressor, a condenser in communication with a refrigerant outlet of the compressor, at least one throttling element in communication with a refrigerant outlet of the condenser, and a first evaporator in communication with a refrigerant outlet of one of the throttling elements, to provide cold energy to at least one of the storage compartments; and

[0010] a heating unit arranged to generate heat for heating the to-be-processed objects in one of the storage compartments or a part of one of the storage compartments; wherein the refrigeration system further comprises:

[0011] a heat dissipation pipeline arranged to communicate at one end with the first evaporator and at the other end with the compressor, and to exchange heat with at least a part of the heating unit.

[0012] Optionally, the refrigeration system further comprises:

[0013] a first gas return pipeline arranged to communicate at one end with the first evaporator and at the other end with the compressor; and

[0014] A first on-off element is configured to selectively communicate the first evaporator with one of the heat dissipation pipeline and the first gas return pipeline.

[0015] Optionally, the refrigeration system further comprises:

[0016] A second evaporator is configured to communicate with one of the throttling elements at one end and the first evaporator at the other end.

[0017] Optionally, the refrigeration system is configured to start or continue the operation of the compressor and make the first on-off element communicate the first evaporator with the heat dissipation pipeline when the heating unit is in operation.

[0018] Optionally, the at least one storage compartment comprises a first compartment and a second compartment, the first compartment is configured to have a set temperature lower than that of the second compartment; wherein,

[0019] The first evaporator is configured to provide cold energy to the first compartment.

[0020] Optionally, the refrigeration system further comprises:

[0021] A first fan is configured to facilitate the air flow around the first evaporator; wherein,

[0022] The refrigeration system is configured to turn off the first fan when the heating unit is in operation and the difference between the actual temperature and the set temperature of the first compartment is less than a first threshold.

[0023] Optionally, the refrigeration system is configured to start the first fan when the difference between the actual temperature and the set temperature of the first compartment is greater than a second threshold; wherein,

[0024] The second threshold is greater than the first threshold.

[0025] Optionally, the refrigeration system further comprises:

[0026] A second evaporator is configured to communicate with the refrigerant outlet of one of the throttling elements;

[0027] A second gas return pipeline is configured to communicate with the second evaporator at one end and the compressor at the other end;

[0028] A communication pipeline is configured to communicate with the second evaporator at one end and the heat dissipation pipeline at the other end, so that the refrigerant in the second evaporator flows into the heat dissipation pipeline and exchanges heat with the heating unit; and

[0029] A second on-off element is arranged to selectively communicate the second evaporator with one of the communication pipeline and the second gas return pipeline.

[0030] The refrigeration system is configured to start the compressor and make the first on-off element communicate the first evaporator with the heat dissipation pipeline, or make the compressor continue to work and make one of the first evaporator and the second evaporator in a cold energy providing state communicate with the heat dissipation pipeline when the heating unit is in a working state.

[0031] Optionally, the heating unit comprises an electromagnetic wave generating system, and the electromagnetic wave generating system comprises:

[0032] A signal source configured to generate an electromagnetic wave signal;

[0033] A power amplifier arranged to be electrically connected with the signal source and increase the power of the electromagnetic wave signal;

[0034] The heat dissipation pipeline is arranged to exchange heat with at least the power amplifier.

[0035] The heat dissipation pipeline is arranged to exchange heat with at least the power amplifier.

[0036] Optionally, the electromagnetic wave generating system further comprises:

[0037] A power supply module arranged to provide electric energy to the signal source and the power amplifier; wherein

[0038] The power supply module, the signal source and the power amplifier are arranged outside the heat preservation layer of the cabinet and located at the top or above the cabinet; and

[0039] The compressor is arranged at the bottom of the cabinet, and the part of the heat dissipation pipeline after heat exchange with the heating unit is arranged outside the heat preservation layer of the cabinet to exchange heat with the ambient environment of the cabinet.

[0040] The refrigeration and freezing device of the present application exchanges the residual cold energy of the evaporator with the heating unit through the heat dissipation pipeline, which can quickly and effectively realize the heat dissipation of the heating device without setting an additional heat dissipation device, reduces the production cost and working energy consumption, and has no noise generated by the working of the heat dissipation fan, has a compact structure, and will not increase the occupied space of the whole machine or the storage space of the storage compartment.

[0041] Further, the application closes the first fan when the heating unit is in working state, and the actual temperature of the first chamber meets the preset temperature condition, so that the first evaporator provides cold quantity to the first chamber through natural convection heat exchange, ensures the preservation effect of the first chamber, reduces the refrigerant temperature at the outlet end of the first evaporator, enhances the heat dissipation effect of the heating unit without increasing energy consumption, reduces the refrigerant temperature entering the compressor, reduces the load of the compressor, and then reduces the outlet temperature of the compressor, realizes a benign cycle, and ensures the heat dissipation effect of the heating unit and the refrigeration effect of the storage chamber.

[0042] Further, the application sets the compressor at the bottom of the box body, sets the part of the heat dissipation pipeline that exchanges heat with the heating unit at the top or above the box body, and sets the part of the heat dissipation pipeline that exchanges heat with the heating unit outside the heat preservation layer of the box body to exchange heat with the surrounding environment of the box body for heat dissipation, further reduces the refrigerant temperature entering the compressor, and improves the heat dissipation effect of the heating unit and the refrigeration effect of the storage chamber.

[0043] The above and other objects, advantages and features of the application will become more apparent from the following detailed description of some embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] Some specific embodiments of the application will be described in detail below with reference to the attached drawings. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0045] Figure 1 is a schematic cross-sectional view of a refrigeration and freezing device according to an embodiment of the application;

[0046] Figure 2 is Figure 1 is a schematic rear view of the refrigeration and freezing device shown in FIG. 1;

[0047] Figure 3 is a schematic structural diagram of a refrigeration system according to an embodiment of the application;

[0048] Figure 4 is a schematic structural diagram of a refrigeration system according to another embodiment of the application;

[0049] Figure 5 is a schematic flowchart of a control method according to an embodiment of the application;

[0050] Figure 6 is a schematic structural diagram of a refrigeration system according to still another embodiment of the application. DETAILED DESCRIPTION

[0051] Figure 1 is a schematic cross-sectional view of a refrigerating-freezing appliance 100 according to an embodiment of the present application; Figure 2 is Figure 1 is a schematic rear view of the refrigerating-freezing appliance 100. Referring to Figure 1 and Figure 2 The refrigerating-freezing appliance 100 can include a cabinet 110 defining at least one storage compartment, at least one cabinet door for opening and closing the at least one storage compartment, a refrigeration system, and a heating unit. In the present application, the at least one is one, two, or more.

[0052] In the illustrated embodiment, the storage compartment defined by the cabinet 110 can include a first compartment 111 and a second compartment 112. The first compartment 111 can be set to a temperature lower than that of the second compartment 112, for example, the first compartment 111 is a freezing compartment and the second compartment 112 is a refrigerating compartment.

[0053] The refrigeration system can include a compressor 120, a condenser 121 in communication with a refrigerant outlet of the compressor 120, at least one throttling element in communication with a refrigerant outlet of the condenser 121, and at least one evaporator in communication with a refrigerant outlet of the at least one throttling element, to provide cold energy to the at least one storage compartment. The throttling element can be a capillary tube or a throttle valve.

[0054] The heating unit can be configured to generate heat for treating objects in one storage compartment or a portion of one storage compartment. In the present application, the heating unit can be a unit having an electromagnetic wave generating system.

[0055] Exemplarily, the heating unit can include a barrel 141 disposed in one storage compartment, and a door 142 opening and closing an access of the barrel 141. The electromagnetic wave generating system is configured to generate electromagnetic waves in the barrel 141.

[0056] The electromagnetic wave generating system can also be configured to generate electromagnetic waves in the entire storage compartment.

[0057] In particular, the electromagnetic wave generating system can include a signal source, a power amplifier 143, a radiating element, and a power module 144.

[0058] The signal source can be configured to generate an electromagnetic wave signal. The power amplifier 143 can be configured to be electrically connected to the signal source and to increase the power of the electromagnetic wave signal.

[0059] The radiating element can be configured to be electrically connected to the power amplifier 143 and to radiate the amplified electromagnetic waves to the surrounding environment.

[0060] The power module 144 can be configured to provide electrical energy to the signal source and the power amplifier 143.

[0061] The compressor 120 can be arranged in a compressor chamber at the bottom of the cabinet 110. The power module 144, signal source, and power amplifier 143 can be arranged outside the thermal insulation layer of the cabinet 110 and at or above the top of the cabinet 110 to reduce the influence on the temperature of the storage compartment.

[0062] In particular, the refrigeration system can further include a heat dissipation pipeline 127. The heat dissipation pipeline 127 can be arranged in communication with one of the evaporators at one end and in communication with the compressor 120 at the other end, and in heat exchange with at least a part of the heating unit to dissipate the heat generated by the heating device of the heating unit using the remaining cold energy of the evaporator and reduce the required arrangement space of the heating device, thereby reducing the production cost and working energy consumption.

[0063] The heat dissipation pipeline 127 can be arranged in heat exchange with at least the power amplifier 143 to increase the continuous working time of the electromagnetic wave generating system and ensure the heating effect.

[0064] The part of the heat dissipation pipeline 127 after heat exchange with the heating unit can be arranged outside the thermal insulation layer of the cabinet 110 to exchange heat with the surrounding environment of the cabinet 110, thereby reducing the temperature of the refrigerant entering the compressor 120 and reducing the load of the compressor 120.

[0065] The technical solutions of the present application will be described below by way of example with the heat dissipation pipeline 127 being in heat exchange with only the power amplifier 143 and the storage compartment including the first compartment 111 and the second compartment 112.

[0066] Figure 3 is a schematic structural diagram of a refrigeration system according to an embodiment of the present application. Referring to Figure 2 and Figure 3 In some embodiments, the refrigeration system can include a compressor 120, a condenser 121, a condenser heat dissipation fan 122, a first capillary tube 123, a first evaporator 124, and a first fan 125. Among them, the refrigeration system has only one evaporator, i.e., the first evaporator 124.

[0067] The first evaporator 124 can be arranged to be capable of providing cold energy to the first compartment 111 and the second compartment 112. For example, the first evaporator 124 is arranged close to the inner container wall of the first compartment 111 and cold air is introduced into the second compartment 112 through an air duct; or the first evaporator 124 is partially arranged in the first compartment 111 and partially arranged in the second compartment 112.

[0068] The first evaporator 124 can be in communication with the compressor 120 through a first return pipeline 126, and the heat dissipation pipeline 127 can be in communication with the first evaporator 124 through a first on-off element 128.

[0069] The first on-off element 128 can be configured to selectively communicate the first evaporator 124 with one of the heat dissipation pipeline 127 and the first return pipeline 126. That is, the first on-off element 128 can selectively communicate the first return pipeline 126 with the first evaporator 124, or selectively communicate the heat dissipation pipeline 127 with the first evaporator 124, so as to improve the refrigeration efficiency and avoid the undesirable increase of the inlet temperature of the compressor 120.

[0070] The refrigeration system can be configured to start or continue the operation of the compressor 120 and communicate the first evaporator 124 with the heat dissipation pipeline 127 when the heating unit is in operation, so as to dissipate the heat of the power amplifier 143.

[0071] The refrigeration system can further comprise a first fan 125 for facilitating the air flow around the first evaporator 124.

[0072] The refrigeration system can be configured to turn off the first fan 125 when the heating unit is in operation and the difference between the actual temperature and the set temperature of the first compartment 111 is less than a first threshold, so as to reduce the refrigerant temperature at the outlet end of the first evaporator 124, enhance the heat dissipation effect of the heating unit without increasing the energy consumption, and reduce the refrigerant temperature entering the compressor 120. Exemplarily, the first threshold can be 2-3℃.

[0073] The refrigeration system can communicate the installation space of the first evaporator 124 with the first compartment 111 while turning off the first fan 125, so as to avoid the rapid temperature rise of the first compartment 111.

[0074] The refrigeration system can be further configured to start the first fan 125 when the difference between the actual temperature and the set temperature of the first compartment 111 is greater than a second threshold, so as to ensure the preservation effect of the first compartment 111. The second threshold can be greater than the first threshold. Exemplarily, the second threshold can be 3.5-4.5℃.

[0075] Figure 4 is a schematic structural diagram of a refrigeration system according to another embodiment of the present application. Referring to Figure 2 and Figure 4 The refrigeration system can comprise a compressor 120, a condenser 121, a condenser heat dissipation fan 122, an electromagnetic valve 132, a first capillary tube 123, a first evaporator 124, a first fan 125, a second capillary tube 133, and a second evaporator 134. The first evaporator 124 and the second evaporator 134 can be configured to provide cold energy to the first compartment 111 and the second compartment 112.

[0076] The second evaporator 134 can be configured to communicate one end with the second throttling element and the other end with the first evaporator 124, so as to provide cold energy to the first compartment 111 while providing cold energy to the second compartment 112.

[0077] The electromagnetic valve 132 can be configured to connect the condenser 121 with one of the first capillary tube 123 and the second capillary tube 133, so as to select whether to supply cold to the second chamber 112.

[0078] The first evaporator 124 can be connected with the compressor 120 through the first return air pipe 126, and the heat dissipation pipe 127 can be connected with the first evaporator 124 through the first on-off element 128.

[0079] The first on-off element 128 can be configured to at least selectively connect the first evaporator 124 with one of the heat dissipation pipe 127 and the first return air pipe 126. That is, the first on-off element 128 can separately connect the first return air pipe 126 with the first evaporator 124, or separately connect the heat dissipation pipe 127 with the first evaporator 124, so as to improve the refrigeration efficiency and avoid the undesirable increase of the inlet temperature of the compressor 120.

[0080] The refrigeration system can be configured to start or continue the operation of the compressor 120 and connect the first evaporator 124 with the heat dissipation pipe 127 through the first on-off element 128 when the heating unit is in the working state, so as to dissipate heat from the power amplifier 143.

[0081] The refrigeration system can further comprise a first fan 125 for promoting the air flow around the first evaporator 124.

[0082] The refrigeration system can be configured to turn off the first fan 125 when the heating unit is in the working state and the difference between the actual temperature and the set temperature of the first chamber 111 is less than a first threshold, so as to reduce the refrigerant temperature at the outlet end of the first evaporator 124, enhance the heat dissipation effect of the heating unit without increasing the energy consumption, and reduce the refrigerant temperature entering the compressor 120. Exemplarily, the first threshold can be 2-3℃.

[0083] The refrigeration system can connect the installation space of the first evaporator 124 with the first chamber 111 while turning off the first fan 125, so as to avoid the rapid temperature rise of the first chamber 111.

[0084] The refrigeration system can be further configured to start the first fan 125 when the difference between the actual temperature and the set temperature of the first chamber 111 is greater than a second threshold, so as to ensure the preservation effect of the first chamber 111. The second threshold can be greater than the first threshold. Exemplarily, the second threshold can be 3.5-4.5℃.

[0085] The refrigeration system can be further configured to start the first fan 125 when the difference between the actual temperature and the set temperature of the first chamber 111 is greater than a second threshold, so as to ensure the preservation effect of the first chamber 111. The second threshold can be greater than the first threshold. Exemplarily, the second threshold can be 3.5-4.5℃.

[0086] Figure 5is a schematic flow chart of a control method for a refrigerating and freezing device 100 according to an embodiment of the present application (wherein "Y" means "Yes"; "N" means "No"). Referring to Figure 5 , the control method for the refrigerating and freezing device 100 according to the present application can comprise the following steps based at least on the embodiment shown in Figure 3 and Figure 4 : when the heating unit is in the working state, the control method for the refrigerating and freezing device 100 can comprise the following steps:

[0087] Step S502: starting or continuing the operation of the compressor 120, and connecting the first on-off element 128 to the first evaporator 124 and the heat dissipation pipeline 127.

[0088] Step S504: determining whether the difference between the actual temperature and the set temperature of the first compartment 111 is less than the first threshold value. If yes, executing step S506; if no, repeating step S504.

[0089] Step S506: turning off the first fan 125 to reduce the refrigerant temperature at the outlet end of the first evaporator 124.

[0090] Step S508: determining whether the difference between the actual temperature and the set temperature of the first compartment 111 is greater than the second threshold value. If yes, executing step S510; if no, returning to step S506.

[0091] Step S510: starting the first fan 125 to ensure the preservation effect of the first compartment 111. And returning to step S504.

[0092] Figure 6 is a schematic structural diagram of a refrigeration system according to another embodiment of the present application. Referring to Figure 2 and Figure 6 , the refrigeration system can comprise a compressor 120, a condenser 121, a condenser heat dissipation fan 122, a solenoid valve 132, a first capillary tube 123, a first evaporator 124, a first fan 125, a second capillary tube 133, and a second evaporator 134. The first evaporator 124 and the second evaporator 134 can be arranged to provide cold energy to the first compartment 111 and the second compartment 112.

[0093] The first evaporator 124 and the second evaporator 134 can be arranged in series with the first capillary tube 123 and the second capillary tube 133, respectively. The solenoid valve 132 can be arranged to connect the condenser 121 with one of the first capillary tube 123 and the second capillary tube 133 to supply cold energy to one of the first compartment 111 and the second compartment 112.

[0094] The first evaporator 124 and the second evaporator 134 can be in communication with the compressor 120 through a first return gas pipeline 126 and a second return gas pipeline 136 respectively. The first return gas pipeline 126 and the second return gas pipeline 136 can share a part of the pipeline.

[0095] A heat dissipation pipeline 127 can be arranged in communication with the first evaporator 124 at one end and the compressor 120 at the other end. The heat dissipation pipeline 127 can be in communication with the first evaporator 124 through a first on-off element 128 to improve the refrigeration efficiency to the first chamber 111 and avoid the undesirable increase of the inlet temperature of the compressor 120.

[0096] The refrigeration system can further be provided with a communication pipeline 137 and a second on-off element 138. The communication pipeline 137 can be arranged in communication with the second evaporator 134 at one end and the heat dissipation pipeline 127 at the other end to make the refrigerant in the second evaporator 134 flow into the heat dissipation pipeline 127 and exchange heat with the heating unit.

[0097] The second on-off element 138 can be arranged to selectively communicate the second evaporator 134 with one of the communication pipeline 137 and the second return gas pipeline 136. That is, the second on-off element 138 can separately conduct the second return gas pipeline 136 and the second evaporator 134, or separately conduct the communication pipeline 137 and the second evaporator 134 to improve the refrigeration efficiency to the second chamber 112 and avoid the undesirable increase of the inlet temperature of the compressor 120.

[0098] The refrigeration system can be configured to start the compressor 120 and make the first on-off element 128 communicate the first evaporator 124 and the heat dissipation pipeline 127, or make the compressor 120 continue to work and make the one of the first evaporator 124 and the second evaporator 134 in the cold supply state communicate with the heat dissipation pipeline 127 when the heating unit is in the working state. That is, if the heating unit is started when the compressor 120 is in the non-working state, the compressor 120 is started and the remaining cold of the first evaporator 124 is used for heat dissipation; if the heating unit is started when the compressor 120 is in the working state, the compressor 120 continues to work and the remaining cold of the evaporator currently conducted by the electromagnetic valve 132 is used for heat dissipation.

[0099] The refrigeration system can be further configured to turn off the fan corresponding to the evaporator for heat dissipation when the difference between the actual temperature of the chamber corresponding to the evaporator and the set temperature is less than a first threshold value, to reduce the refrigerant temperature at the outlet end of the evaporator; and start the fan corresponding to the evaporator for heat dissipation when the difference between the actual temperature of the chamber corresponding to the evaporator and the set temperature is greater than a second threshold value, to ensure the preservation effect of the corresponding chamber.

[0100] At this point, those skilled in the art will appreciate that although specific exemplary embodiments of the application have been described herein, the present application also encompasses many other variations or modifications in accordance with the principles of the application as set forth above. Accordingly, the scope of the present application should be understood to include all such variations and modifications.

Claims

1. A refrigerator comprising: a cabinet defining at least one storage compartment; a refrigeration system comprising a compressor, a condenser in communication with a refrigerant outlet of the compressor, at least one throttling element in communication with a refrigerant outlet of the condenser, and a first evaporator in communication with a refrigerant outlet of one of the throttling elements to provide a cooling capacity to the at least one storage compartment; and a heating unit configured to generate heat to heat an object to be treated in or at a portion of one of the storage compartments; wherein the refrigeration system further comprises: a heat dissipation line configured to be in communication at one end with the first evaporator and at the other end with the compressor, and to exchange heat with at least a portion of the heating unit; wherein the heating unit comprises an electromagnetic wave generating system, and the electromagnetic wave generating system comprises: a signal source configured to generate an electromagnetic wave signal; a power amplifier configured to be electrically connected with the signal source and to increase a power of the electromagnetic wave signal; and a power supply module configured to provide electric energy to the signal source and the power amplifier; wherein the heat dissipation line is configured to exchange heat with at least the power amplifier; the power supply module, the signal source, and the power amplifier are disposed outside a thermal insulation layer of the cabinet and at a top or above the cabinet; and the compressor is disposed at a bottom of the cabinet, and a portion of the heat dissipation line after exchanging heat with the heating unit is disposed outside the thermal insulation layer of the cabinet to exchange heat with an ambient environment of the cabinet. the refrigeration system further comprises:

2. The cold appliance of claim 1, wherein a first gas return line configured to be in communication at one end with the first evaporator and at the other end with the compressor; and a first on-off element configured to selectively communicate the first evaporator with one of the heat dissipation line and the first gas return line. the refrigeration system further comprises:

3. The cold appliance of claim 2, wherein a second evaporator configured to be in communication at one end with one of the throttling elements and at the other end with the first evaporator. 4.The refrigerator of claim 2, wherein the refrigeration system is configured to start or continue operating the compressor and to communicate the first evaporator with the heat dissipation line when the heating unit is in an operating state. 5.The refrigerator of claim 4, wherein the at least one storage compartment comprises a first compartment and a second compartment, and a set temperature of the first compartment is less than a set temperature of the second compartment; wherein the first evaporator is configured to provide the cooling capacity to the first compartment. the refrigeration system further comprises:

6. The cold appliance of claim 5, wherein a first fan configured to facilitate air flow around the first evaporator; wherein the refrigeration system is configured to turn off the first fan when the heating unit is in an operating state and a difference between an actual temperature and the set temperature of the first compartment is less than a first threshold value. 7.The refrigerator of claim 6, wherein the refrigeration system is configured to start the first fan when the difference between the actual temperature and the set temperature of the first compartment is greater than a second threshold value; wherein the second threshold value is greater than the first threshold value. ​ 8. The cold freezing device according to claim 2, wherein, The refrigeration system further comprises: a second evaporator arranged in communication with a refrigerant outlet of one of the throttling elements; a second gas return line arranged in communication at one end with the second evaporator and at the other end with the compressor; a communication line arranged in communication at one end with the second evaporator and at the other end with the heat dissipation line, so that refrigerant in the second evaporator flows into the heat dissipation line and exchanges heat with the heating unit; and a second on-off element arranged to selectively communicate the second evaporator with one of the communication line and the second gas return line; wherein the refrigeration system is configured to, when the heating unit is in an operating state, start the compressor and cause the first on-off element to communicate the first evaporator with the heat dissipation line, or cause the compressor to continue operating and cause one of the first evaporator and the second evaporator in a cold supply state to communicate with the heat dissipation line.

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