Defrosting control method of refrigeration equipment and refrigeration equipment

Abstract

The application provides a defrosting control method of a refrigeration equipment and the refrigeration equipment. The defrosting control method comprises the following steps: controlling a compressor to stop working, connecting a liquid storage tank and a condenser to make refrigerant in the liquid storage tank flow into an evaporator, and judging whether a time length S1 of the connection of the liquid storage tank and the condenser is greater than or equal to a preset refrigerant flow time length S2; when the time length S1 is greater than or equal to the preset refrigerant flow time length S2, the connection of the liquid storage tank and the condenser is controlled to be disconnected; controlling a defrosting heater to work, starting a circulating device used for driving refrigerant in a defrosting circuit to flow, and judging whether a temperature T1 of the evaporator is greater than or equal to a preset evaporator temperature T2; when the temperature T1 is greater than or equal to the preset evaporator temperature T2, the defrosting heater and the circulating device are controlled to stop working; and controlling the compressor to be connected with the liquid storage tank. In the defrosting process, the refrigerant in the liquid storage tank is introduced into the evaporator, and the circulating device is used to accelerate the flow of the refrigerant in the defrosting circuit, so that the local temperature of the evaporator is prevented from being high during the defrosting, and the preservation of food in the refrigeration equipment is prevented from being affected.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, specifically to a defrosting control method and refrigeration equipment. Background Technology

[0002] In existing technologies, after prolonged cooling, water vapor on the surface of the evaporator in refrigeration equipment gradually condenses into frost, and the thickness of the frost gradually increases with the duration of cooling, eventually causing frost blockage of the evaporator, leading to poor or no cooling.

[0003] Existing refrigeration equipment typically uses a heater for defrosting. Specifically, when the amount of frost on the evaporator reaches a certain level, the compressor in the refrigeration equipment stops running, thus stopping the refrigeration system, and the heater is energized to begin defrosting. Once the frost on the evaporator surface has melted completely, the compressor restarts, allowing the refrigeration system to resume refrigeration. The inventors have discovered at least the following technical problems with the existing technology: During the defrosting process, because the refrigeration system stops cooling and the heater is heating, the temperature in the storage compartment of the refrigeration equipment rises rapidly, causing the temperature of the food stored inside to rise accordingly. After defrosting, re-refrigeration is required to bring the temperature of the storage compartment back to the pre-defrosting set temperature. During this process, the temperature fluctuations inside the storage compartment are significant, affecting the spoilage or nutrient loss of the food, which is detrimental to food storage. Summary of the Invention

[0004] This invention provides a defrosting control method and a refrigeration device to solve the technical problem of high local temperature of the evaporator during the defrosting process in existing refrigeration devices, which is not conducive to food preservation inside the refrigeration device.

[0005] To achieve one of the above-mentioned objectives, an embodiment of the present invention provides a defrosting control method for a refrigeration device, which includes the following steps:

[0006] The compressor is stopped, and the liquid receiver tank and condenser are connected so that the refrigerant in the liquid receiver tank flows into the evaporator along the refrigeration pipeline. The duration S1 of the connection between the liquid receiver tank and the condenser is recorded.

[0007] Determine whether the duration S1 is greater than or equal to the preset value S2 of the refrigerant flow duration;

[0008] If the duration S1 ≥ S2, then the connection between the liquid storage tank and the condenser is disconnected; otherwise, the connection between the liquid storage tank and the condenser remains open.

[0009] Control the defrost heater used to defrost the evaporator, start the circulation device used to drive the refrigerant flow in the defrost circuit, and monitor the temperature T1 of the evaporator;

[0010] Determine whether the temperature T1 is greater than or equal to the preset evaporator temperature T2;

[0011] When T1≥T2, the defrosting heater and circulation device are stopped; the compressor is connected to the liquid receiver to divert the refrigerant in the evaporator to the liquid receiver.

[0012] The preset temperature value T2 of the evaporator is set to 2 to 6 degrees Celsius.

[0013] As a further improvement to the above technology, the defrosting control method also includes:

[0014] After “controlling the compressor to stop working”, when connecting the liquid receiver and the condenser, the bypass line connected in parallel with the throttling device is simultaneously kept in a connected state.

[0015] When the connection between the liquid storage tank and the condenser is disconnected as described above, the bypass pipeline connected in parallel with the throttling device is simultaneously disconnected.

[0016] As a further improvement to the above technology, the step of "controlling the connection between the compressor and the liquid receiver to divert the refrigerant in the evaporator to the liquid receiver" specifically includes:

[0017] Control the compressor to work, control the connection between the compressor and the liquid receiver tank, disconnect the compressor from the condenser, and monitor the temperature T3 of the refrigerant in the liquid receiver tank;

[0018] Determine whether temperature T3 is greater than or equal to the preset temperature value T4 inside the storage tank;

[0019] When T3≥T4, the connection between the compressor and the liquid receiver is disconnected, and the compressor is connected to the condenser.

[0020] The preset temperature T4 inside the liquid storage tank is set to 25-35 degrees Celsius.

[0021] As a further improvement to the above technology, the step of "controlling the connection between the compressor and the liquid receiver to divert the refrigerant in the evaporator to the liquid receiver" specifically includes:

[0022] Control the compressor to work, control the connection between the compressor and the liquid receiver tank, disconnect the compressor from the condenser, and monitor the pressure P1 of the refrigerant in the liquid receiver tank;

[0023] Determine whether the pressure P1 is greater than or equal to the preset pressure value P2 inside the liquid storage tank;

[0024] When pressure P1 ≥ P2, the connection between the compressor and the liquid receiver is disconnected, and the compressor is connected to the condenser.

[0025] The preset pressure value P2 inside the liquid storage tank is set to 0.7 to 0.9 MPa.

[0026] The present invention also provides a refrigeration device employing the above-described defrosting control method. The refrigeration device includes a refrigeration system comprising a compressor, a condenser, a throttling device, and an evaporator connected sequentially. The refrigeration system includes a defrosting heater for defrosting the evaporator, a first monitoring unit for monitoring the evaporator temperature, a first pipeline connected in parallel with the evaporator, a second pipeline connecting the compressor and the condenser, a liquid storage tank connected to the second pipeline, and a first control valve connecting the liquid storage tank and the second pipeline.

[0027] During the defrosting process of the evaporator, the evaporator and the first pipeline form a defrosting circuit, and the first pipeline is equipped with a circulation device to drive the refrigerant flow in the defrosting circuit; the first control valve can control the connection of any two of the compressor, liquid receiver and condenser respectively.

[0028] As a further improvement to the above technology, the refrigeration system also includes a bypass line connected in parallel with the throttling device and a second control valve for controlling the opening or closing of the bypass line.

[0029] As a further improvement to the above technology, the refrigeration system also includes a second monitoring unit for monitoring the refrigerant pressure and / or temperature in the liquid storage tank.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: In the defrosting control method provided by the present invention, the refrigerant in the liquid storage tank is introduced into the evaporator, and the circulation device is used to accelerate the flow of refrigerant in the defrosting circuit, thereby avoiding local high temperature in the evaporator during the defrosting process, reducing heat loss to the surrounding storage chamber, avoiding large temperature fluctuations in the storage chamber during the defrosting process of the evaporator, and thus preventing the food stored in the refrigeration equipment from spoiling or losing nutrients. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the refrigeration system in a refrigeration device provided in an embodiment of the present invention.

[0032] Figure 2 This is a flowchart of the defrosting control method for the refrigeration equipment provided by the present invention.

[0033] Figure 3 yes Figure 2 The flowchart shown illustrates the process of adjusting the refrigerant in the evaporator to a cooling state after the defrosting heater stops working in the defrosting control method. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "front," "rear," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] One embodiment of the present invention provides a refrigeration device, which includes a refrigerator compartment, a freezer compartment, and a refrigeration system 10. For example... Figure 1 As shown, the refrigeration system 10 includes a compressor 11, a condenser 12, a throttling device 13, and an evaporator 14 connected sequentially. Additionally, the refrigeration system 10 includes a defrost heater 141 for defrosting the evaporator, a first monitoring unit 142 for monitoring the evaporator temperature, a first pipeline 15 connected in parallel with the evaporator 14, a second pipeline 16 connecting the compressor 11 and the condenser 12, a liquid receiver 17 connected to the second pipeline 16, and a first control valve 18 connecting the liquid receiver 17 and the second pipeline 16.

[0037] Optionally, the first monitoring unit 142 may be configured as a temperature sensor.

[0038] Furthermore, during the defrosting process of the evaporator 14, the evaporator 14 and the first pipeline 15 form a defrosting circuit 19, and a circulation device 191 for driving the refrigerant flow in the defrosting circuit 19 is provided on the first pipeline 15. The first control valve 18 can control the connection of any two of the compressor 11, the liquid receiver 17, and the condenser 12.

[0039] When the refrigeration system 10 needs to perform refrigeration, the first control valve 18 controls the compressor 11 to connect with the condenser 12, so that the refrigerant flows through the compressor 11, condenser 12, throttling device 13 and evaporator 14 in sequence and returns to the compressor 11, thereby realizing the refrigeration function of the refrigeration system 10.

[0040] After prolonged cooling operation, the evaporator 14 in the refrigeration system 10 will gradually accumulate frost on its surface, affecting the cooling efficiency of the system. Therefore, when the frost level reaches a certain value, the controller in the refrigeration equipment will initiate a defrosting procedure. During the cooling process of the refrigeration system 10, the amount of frost on the evaporator 14 cannot be directly observed. In one embodiment of the invention, the need for defrosting of the evaporator 14 can be determined by the continuous cooling time and / or the cumulative door opening time.

[0041] During the defrosting process of the evaporator 14, the controller stops the compressor 11, and the first control valve 18 connects the liquid receiver 17 and the condenser 12. At this time, the liquid receiver 17 is connected to the condenser 12, and the compressor 11 can only allow refrigerant to flow in one direction. Therefore, the refrigerant in the liquid receiver 17 flows towards the condenser 12, changing the pressure difference across the throttling device 13. Under the pressure on both sides of the throttling device 13, the refrigerant in the liquid receiver 17 gradually flows into the evaporator 14 to balance the pressure on both sides of the throttling device 13.

[0042] Furthermore, to accelerate the flow of refrigerant from the liquid receiver 17 into the evaporator 14, the refrigeration system 10 also includes a bypass line 21 connected in parallel with the throttling device 14 and a second control valve 211 for controlling the opening or closing of the bypass line 21. When the first control valve 18 connects the liquid receiver 17 and the condenser 12, the second control valve 211 is simultaneously opened to keep the bypass line 21 connected, allowing the refrigerant in the liquid receiver 17 to gradually flow into the evaporator 14; when the pressure on both sides of the throttling device 13 is balanced and the refrigerant no longer flows, the second control valve 211 is closed to keep the bypass line 21 disconnected.

[0043] Furthermore, after the pressure on both sides of the throttling device 13 is balanced, the defrosting heater 141 and the circulation device 191 are controlled to start working, so that the refrigerant flows continuously in the defrosting circuit 19, avoiding local high temperature of the evaporator 14 during the defrosting process, reducing heat loss to the storage compartment of the refrigeration equipment, and preventing the food stored in the refrigeration equipment from spoiling or losing nutrients.

[0044] During the defrosting process of the evaporator 14, the first detection unit 142 monitors the temperature of the evaporator 14 in real time. When the temperature of the evaporator 14 reaches a preset value, that is, when the frost layer on the surface of the evaporator 14 melts completely.

[0045] In this embodiment, during the defrosting process, the amount of refrigerant in the evaporator 14 exceeds the refrigerant requirement of the refrigeration process. Therefore, when the temperature of the evaporator 14 reaches a preset value, the controller controls the compressor 11 to start working, and the first control valve 18 connects the compressor 11 and the liquid storage tank 17 to introduce the refrigerant in the evaporator 14 into the liquid storage tank 17.

[0046] In addition, during the continuous return of refrigerant to the receiver 17, it is necessary to monitor the refrigerant pressure and / or temperature within the receiver 17 to prevent the amount of refrigerant introduced into the receiver 17 from exceeding its capacity. Therefore, the refrigeration system also includes a second detection unit 171 for monitoring the refrigerant pressure and / or temperature within the receiver 17. When the second detection unit 171 detects that the pressure and / or temperature within the receiver 17 meets a preset value, the defrosting of the refrigeration system 10 is complete.

[0047] Those skilled in the art will readily recognize that the accuracy of the determination can be improved by combining the pressure and temperature within the storage tank 17 to determine whether the refrigerant introduced into the storage tank 17 exceeds its capacity. Therefore, any solutions identical or similar to this embodiment are covered within the scope of protection of this invention.

[0048] like Figure 2 As shown, in one embodiment of the present invention, a defrosting control method for a refrigeration device is also provided, the defrosting control method comprising the following steps:

[0049] S10, control the compressor to stop working, connect the liquid receiver tank and the condenser so that the refrigerant in the liquid receiver tank flows into the evaporator along the refrigeration pipeline, and record the duration S1 of the connection between the liquid receiver tank and the condenser.

[0050] Specifically, when the evaporator 14 in the refrigeration equipment needs to defrost, the controller controls the compressor 11 to stop working. However, the amount of refrigerant in the evaporator 14 during the refrigeration process cannot meet the defrosting requirements of the evaporator. Therefore, it is necessary to connect the liquid receiver 17 and the condenser 12 so that the refrigerant in the liquid receiver 17 flows into the evaporator.

[0051] When the liquid storage tank 17 is connected to the condenser 12, the pressure difference on both sides of the throttling device 13 is changed. Under the action of pressure, the refrigerant in the liquid storage tank 17 flows into the evaporator 14, so as to balance the pressure on both sides of the throttling device 13.

[0052] Optionally, to accelerate the flow of refrigerant from the liquid receiver 17 into the evaporator 14, the second control valve 211 on the bypass line 21 is opened simultaneously during the aforementioned "connection of the liquid receiver 17 and the condenser". That is, when the controller controls the connection between the liquid receiver 17 and the condenser 12, the second control valve 211 is opened simultaneously to keep the bypass line 21 in a connected state.

[0053] S20, determine whether the duration S1 is greater than or equal to the preset value S2 of refrigerant flow duration;

[0054] If the duration S1 ≥ S2, then the connection between the liquid storage tank and the condenser is disconnected; otherwise, the connection between the liquid storage tank and the condenser remains open.

[0055] During the defrosting process, the effect to be achieved in step S10, "pressure balance on both sides of the throttling device", is not easily observed directly. Therefore, in this embodiment, the pressure balance on both sides of the throttling device 13 is determined by comparing the duration S1 of the connection between the liquid storage tank 17 and the condenser 12 with the preset value S2 of the refrigerant flow duration. This determines whether the refrigerant in the liquid storage tank 17 is no longer flowing to the evaporator 14.

[0056] Furthermore, when the duration S1 ≥ S2, the refrigerant in the liquid storage tank 17 no longer flows into the evaporator 14, that is, at this time the connection between the liquid storage tank 17 and the condenser 12 can be controlled to be disconnected.

[0057] According to experimental tests, the preset value S2 for the refrigerant flow time can be set to 5 to 10 minutes. In this embodiment, the preset value S2 for the refrigerant flow time is set to 5 minutes.

[0058] Additionally, if in step S10, the controller controls the second control valve 211 to open the bypass line 21, that is, controls the bypass line 21 to be in a connected state, then correspondingly, while controlling the connection between the liquid storage tank 17 and the condenser 12 to be disconnected, the bypass line 21 is controlled to be in a disconnected state.

[0059] S20 controls the defrost heater used to defrost the evaporator, starts the circulation device used to drive the refrigerant flow in the defrost circuit, and monitors the temperature T1 of the evaporator.

[0060] Specifically, after the liquid storage tank 17 is disconnected from the condenser 12, the defrosting heater 141 is controlled to operate, and the circulation device 191 is activated to accelerate the flow of refrigerant in the defrosting circuit 19. The circulation device 19 is designed to prevent the local temperature of the evaporator 14 from becoming too high during the defrosting process, and to prevent heat from escaping into the storage chamber, thereby avoiding affecting the preservation of food in the refrigeration equipment.

[0061] S30, determine whether the temperature T1 is greater than or equal to the preset evaporator temperature T2;

[0062] When T1≥T2, the defrosting heater and circulation device are stopped.

[0063] Specifically, during the defrosting process of the evaporator, the first monitoring unit 142 monitors the temperature T1 of the evaporator 14 and transmits the temperature data to the controller. The controller compares the temperature T1 with the preset temperature T2 of the evaporator to determine the defrosting status of the evaporator 14.

[0064] When the temperature T1 is greater than or equal to the preset temperature T2 of the evaporator, the frost on the surface of the evaporator 14 melts.

[0065] Experimental tests show that the preset evaporator temperature T2 can be set to 2–6 degrees Celsius. In this embodiment, the preset evaporator temperature T2 is set to 2 degrees Celsius.

[0066] S40, control the compressor to connect to the liquid receiver to divert the refrigerant in the evaporator to the liquid receiver.

[0067] During the defrosting process, the amount of refrigerant in the evaporator 14 exceeds the refrigerant requirements of the refrigeration process. Therefore, it is necessary to control the outlet of the compressor 11 to be connected to the liquid storage tank 17 in order to divert the refrigerant in the evaporator 14 to the liquid storage tank 17.

[0068] In addition, during the process of continuously returning the refrigerant to the liquid storage tank 17, it is necessary to monitor the pressure and / or temperature inside the liquid storage tank 17 to prevent the refrigerant introduced into the liquid storage tank 17 from exceeding the tank's capacity.

[0069] In this embodiment, as Figure 3 As shown, step S40, "controlling the compressor to connect with the liquid receiver to divert the refrigerant in the evaporator to the liquid receiver," can specifically include the following steps:

[0070] S41 controls the compressor to work, connects the compressor to the liquid receiver tank, disconnects the compressor from the condenser, and monitors the temperature T3 of the refrigerant in the liquid receiver tank.

[0071] Specifically, when the temperature T1 of the evaporator 14 is greater than or equal to T2, the compressor 11 is controlled to start working, and the compressor 11 and the liquid receiver 17 are connected to draw the refrigerant in the evaporator 14 to the evaporator. At the same time, the connection between the compressor 11 and the condenser 12 is disconnected, and the temperature T3 of the refrigerant in the liquid receiver 17 is monitored.

[0072] S42, determine whether the temperature T3 is greater than or equal to the preset temperature T4 inside the storage tank;

[0073] S43, when T3≥T4, the connection between the compressor and the liquid receiver is disconnected, and the compressor is connected to the condenser.

[0074] Specifically, when the temperature T3≥T4, the remaining amount of refrigerant in the evaporator 14 can meet the refrigeration requirements of the refrigeration system. At this time, the controller can control the compressor 11 and the liquid receiver 17 to disconnect, and the compressor 11 and the condenser 12 to connect, so that the refrigeration system 10 can run the refrigeration program.

[0075] According to experimental tests, the preset temperature T4 inside the liquid storage tank can be set to 25-35 degrees Celsius. Optionally, the preset temperature T4 inside the liquid storage tank is set to 32 degrees Celsius.

[0076] In another embodiment of the invention, such as Figure 3 As shown, step S40, "controlling the compressor to connect with the liquid receiver to divert the refrigerant in the evaporator to the liquid receiver," may further include:

[0077] S45 controls the compressor to work, connects the compressor to the liquid receiver tank, disconnects the compressor from the condenser, and monitors the refrigerant pressure P1 in the liquid receiver tank.

[0078] Specifically, when the temperature T1 of the evaporator 14 is greater than or equal to T2, the compressor 11 is controlled to start working, and the compressor 11 and the liquid receiver 17 are connected to guide the refrigerant in the evaporator 14 to the evaporator. At the same time, the connection between the compressor 11 and the condenser 12 is disconnected, and the pressure P1 of the refrigerant in the liquid receiver 17 is monitored.

[0079] S46, Determine whether the pressure P1 is greater than or equal to the preset pressure value P2 in the liquid storage tank;

[0080] S47, when pressure P1≥P2, the connection between the compressor and the liquid storage tank is disconnected, and the compressor is connected to the condenser.

[0081] Specifically, when the pressure P1≥P2, the remaining amount of refrigerant in the evaporator 14 can meet the refrigeration requirements of the refrigeration system. At this time, the controller can control the compressor 11 and the liquid receiver 17 to disconnect, and the compressor 11 and the condenser 12 to connect, so that the refrigeration system 10 can run the refrigeration program.

[0082] According to experimental tests, the preset pressure value P2 inside the liquid storage tank 17 can be set to 0.7-0.9 MPa. Optionally, the preset pressure value P2 inside the liquid storage tank 17 can be set to 0.8 MPa.

[0083] In summary, those skilled in the art will readily recognize that when monitoring whether the refrigerant in the return storage tank 17 exceeds its capacity, the determination can be made based on the pressure and temperature within the storage tank, or a combination of both. Therefore, any solutions that are the same as or similar to this embodiment are covered within the scope of protection of this invention.

[0084] In summary, the beneficial effects of the present invention are as follows: The defrosting control method provided by the present invention introduces the refrigerant from the liquid storage tank 17 into the evaporator 14, thereby avoiding large temperature fluctuations in the evaporator 14 during the defrosting process, reducing heat loss to the surrounding storage compartments, and thus preventing food spoilage or nutrient loss within the refrigeration equipment. Furthermore, the circulation device 191 accelerates the flow of refrigerant within the defrosting circuit 19, preventing excessively high local temperatures in the evaporator 14 during the defrosting process and reducing energy loss.

[0085] 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.

[0086] 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 defrosting control method for a refrigeration device, characterized in that, The defrosting control method includes the following steps: The compressor is stopped, the liquid receiver tank and the condenser are connected, and the bypass line connected in parallel with the throttling device is kept in a connected state so that the refrigerant in the liquid receiver tank flows into the evaporator along the refrigeration line, and the duration S1 of the connection between the liquid receiver tank and the condenser is recorded. Determine whether the duration S1 is greater than or equal to the preset value S2 of the refrigerant flow duration; If the duration S1 ≥ S2, then the connection between the liquid storage tank and the condenser is disconnected; otherwise, the connection between the liquid storage tank and the condenser remains open. Control the defrost heater used to defrost the evaporator, start the circulation device used to drive the refrigerant flow in the defrost circuit, and monitor the temperature T1 of the evaporator; Determine whether the temperature T1 is greater than or equal to the preset evaporator temperature T2; When T1≥T2, the defrosting heater and circulation device are stopped. The compressor is connected to the receiver tank to divert the refrigerant in the evaporator to the receiver tank.

2. The defrosting control method for refrigeration equipment according to claim 1, characterized in that, The defrosting control method further includes: When the connection between the liquid storage tank and the condenser is disconnected as described above, the bypass pipeline connected in parallel with the throttling device is simultaneously disconnected.

3. The defrosting control method for refrigeration equipment according to claim 1, characterized in that, The preset temperature value T2 of the evaporator is set to 2~6 degrees Celsius.

4. The defrosting control method for refrigeration equipment according to claim 1, characterized in that, The above step of "controlling the connection between the compressor and the receiver tank to divert the refrigerant in the evaporator to the receiver tank" specifically includes: Control the compressor to work, control the connection between the compressor and the liquid receiver tank, disconnect the compressor from the condenser, and monitor the temperature T3 of the refrigerant in the liquid receiver tank; Determine whether temperature T3 is greater than or equal to the preset temperature value T4 inside the storage tank; When T3≥T4, the connection between the compressor and the liquid receiver is disconnected, and the compressor is connected to the condenser.

5. The defrosting control method for refrigeration equipment according to claim 4, characterized in that, The preset temperature T4 inside the liquid storage tank is set to 25~35 degrees Celsius.

6. The defrosting control method for refrigeration equipment according to claim 1, characterized in that, The above step of "controlling the connection between the compressor and the receiver tank to divert the refrigerant in the evaporator to the receiver tank" specifically includes: Control the compressor to work, control the connection between the compressor and the liquid receiver tank, disconnect the compressor from the condenser, and monitor the pressure P1 of the refrigerant in the liquid receiver tank; Determine whether the pressure P1 is greater than or equal to the preset pressure value P2 inside the liquid storage tank; When pressure P1 ≥ P2, the connection between the compressor and the liquid receiver is disconnected, and the compressor is connected to the condenser.

7. The defrosting control method for refrigeration equipment according to claim 6, characterized in that, The preset pressure P2 inside the liquid storage tank is set to 0.7~0.9 MPa.

8. A refrigeration device, the refrigeration device comprising a refrigeration system, the refrigeration system comprising a compressor, a condenser, a throttling device, and an evaporator connected sequentially end to end; characterized in that, The refrigeration system includes a defrost heater for defrosting the evaporator, a first monitoring unit for monitoring the evaporator temperature, a first pipeline connected in parallel with the evaporator, a second pipeline connecting the compressor and the condenser, a liquid storage tank connected to the second pipeline, a first control valve connecting the liquid storage tank and the second pipeline, a bypass pipeline connected in parallel with the throttling device, and a second control valve for controlling the connection or disconnection of the bypass pipeline. During the defrosting process of the evaporator, the evaporator and the first pipeline form a defrosting circuit, and the first pipeline is equipped with a circulation device to drive the refrigerant flow in the defrosting circuit; the first control valve can control the connection of any two of the compressor, liquid receiver and condenser respectively.

9. The refrigeration equipment according to claim 8, characterized in that, The refrigeration system also includes a second monitoring unit for monitoring the refrigerant pressure and / or temperature inside the liquid storage tank.

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