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, controlling a bypass pipeline connected with a throttling device to be in a connected state, and judging whether a time length S1, during which the bypass pipeline is in the connected state, 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 bypass pipeline is controlled to be in a disconnected state; then, a defrosting heater used for defrosting an evaporator and a circulating device used for driving refrigerant in a defrosting loop to flow are controlled to work, and whether a temperature T1 of the evaporator is greater than or equal to a preset evaporator temperature T2 is judged; when the temperature T1 is greater than or equal to the preset evaporator temperature T2, the defrosting heater is controlled to stop working; and the circulating device is controlled to stop working. In the defrosting process, the refrigeration equipment introduces the refrigerant in a refrigeration pipeline into the evaporator, and utilizes the circulating device to accelerate the flow of the refrigerant in the defrosting loop, 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 storage in 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 bypass line connected in parallel with the throttling device is kept in a connected state so that the refrigerant in the refrigeration line flows into the evaporator. The duration S1 of the bypass line being in a connected state is recorded, wherein the refrigerant flow resistance in the bypass line is less than the refrigerant flow resistance in the throttling device.

[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 bypass pipeline is controlled to be in the disconnected state; otherwise, the bypass pipeline remains in the connected state.

[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 is stopped.

[0012] The control circulation device stops working.

[0013] According to experimental tests, the preset value S2 for refrigerant flow time can be set to 5 to 10 minutes; the preset value T2 for evaporator temperature can be set to 2 to 6 degrees Celsius.

[0014] As a further improvement to the above technology, the defrosting control method also includes:

[0015] After "controlling the compressor to stop working", when the bypass line connected in parallel with the control and throttling device is in the connected state, the liquid receiver tank is simultaneously connected to the evaporator so that the refrigerant in the liquid receiver tank flows into the evaporator.

[0016] After the above-mentioned "control defrosting heater to stop working", the circulation device is connected to the liquid storage tank to flow the refrigerant in the evaporator back to the liquid storage tank, and the pressure and / or temperature of the refrigerant in the liquid storage tank are monitored to see if they meet the preset values.

[0017] As a further improvement to the above technology, the step of "monitoring whether the pressure and / or temperature of the refrigerant in the liquid storage tank meets the preset value" specifically includes:

[0018] Monitor the temperature T3 of the refrigerant in the liquid storage tank;

[0019] Determine whether temperature T3 is greater than or equal to the preset temperature value T4 inside the storage tank;

[0020] When the temperature T3 ≥ T4, the connection between the control circulation device and the storage tank is disconnected.

[0021] According to experimental tests, the preset temperature T4 inside the liquid storage tank can be set to 3 to 8 degrees Celsius.

[0022] As a further improvement to the above technology, the step of "monitoring whether the pressure and / or temperature of the refrigerant in the liquid storage tank meets the preset value" specifically includes:

[0023] Monitor the refrigerant pressure P1 in the liquid storage tank;

[0024] Determine whether the pressure P1 is greater than or equal to the preset pressure value P2 inside the liquid storage tank;

[0025] When pressure P1 ≥ P2, the connection between the control circulation device and the storage tank is disconnected.

[0026] According to experimental tests, the preset pressure value P2 inside the liquid storage tank can be set to 0.15 to 0.3 MPa.

[0027] 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. Furthermore, the refrigeration system includes a bypass pipeline connected in parallel with the throttling device, a first control valve for controlling the opening or closing of the bypass pipeline, a defrosting heater for defrosting the evaporator, a first pipeline connected in parallel with the evaporator, a liquid receiver connected to the first pipeline, a second control valve for controlling the opening or closing of the first pipeline, and a first monitoring unit for monitoring the evaporator temperature. When the first control valve is open and the second control valve is closed, the evaporator and the first pipeline form a defrosting circuit, and a circulation device for driving the refrigerant flow within the defrosting circuit is provided on the first pipeline.

[0028] 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.

[0029] Compared with existing technologies, the advantages of this invention are as follows: By introducing refrigerant from the refrigeration pipeline into the evaporator during the defrosting process, this invention avoids large temperature fluctuations in the evaporator during defrosting, reduces heat loss to surrounding storage compartments, and thus prevents food spoilage or nutrient loss within the refrigeration equipment. Furthermore, the circulation device accelerates the flow of refrigerant within the defrosting circuit, preventing excessively high local temperatures in the evaporator during defrosting and reducing energy loss. Attached Figure Description

[0030] 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.

[0031] Figure 2 This is a schematic flowchart of the defrosting control method for the refrigeration equipment provided by the present invention.

[0032] Figure 3 This is a flowchart illustrating the step "monitoring whether the pressure and / or temperature of the refrigerant in the liquid storage tank meets the preset value" in the defrosting control method provided by the present invention. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] 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 bypass line 15 connected in parallel with the throttling device 13, a first control valve 151 for controlling the opening or closing of the bypass line 15, a defrost heater 141 for defrosting the evaporator, a first line 16 connected in parallel with the evaporator 14, a liquid receiver 161 connected to the first line 16, a second control valve 162 for controlling the opening or closing of the first line 16, and a first monitoring unit 142 for monitoring the temperature of the evaporator 14.

[0036] Optionally, the first monitoring unit 142 may be configured as a temperature sensor.

[0037] In this embodiment, when the first control valve 151 is disconnected and the second control valve 162 is opened, the evaporator 14 and the first pipeline 16 form a defrosting circuit. The first pipeline 16 is equipped with a circulation device 163 that drives the refrigerant flow in the defrosting circuit. The second control valve 162 can also control the connection between the circulation device 163, the liquid receiver 161, and the evaporator 14.

[0038] When the refrigeration system 10 needs to refrigerate, the first control valve 151 is disconnected, and the second control valve 162 controls the first pipeline 16 to disconnect. At this time, the refrigerant in the refrigeration system 10 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.

[0039] After the evaporator 14 in the refrigeration system 10 has been operating for a long time, the amount of frost on the surface of the evaporator 14 will gradually accumulate, affecting the refrigeration efficiency of the refrigeration system 10. Therefore, when the amount of frost reaches a certain value, the controller in the refrigeration equipment needs to control the refrigeration system 10 to run a defrosting program.

[0040] In the refrigeration process of the refrigeration system 10, the amount of frost on the evaporator 14 is not easily observed directly. Therefore, in one embodiment of the present invention, whether the evaporator 14 needs defrosting is mainly determined by the continuous refrigeration 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 151 opens to connect the bypass line 15. At this time, the refrigerant in the refrigeration line gradually flows into the evaporator 14 under pressure, and the pressure on both sides of the first control valve 151 gradually equalizes, and the refrigerant stops flowing.

[0042] Optionally, when the controller stops the compressor 11, and simultaneously controls the first control valve 151 to open so that the refrigerant in the refrigeration pipeline flows to the evaporator, the controller also controls the liquid receiver 161 to connect with the evaporator 14, so that the refrigerant in the liquid receiver 161 flows into the evaporator 14, increasing the amount of refrigerant in the evaporator 14 and preventing the evaporator 14 from getting too hot during defrosting, which would affect the preservation of food in the refrigeration equipment. This also reduces heat loss to the storage compartment, lowering energy consumption.

[0043] In this embodiment, when the pressure on both sides of the first control valve 151 is balanced, the controller controls the first control valve 151 to close, so that the bypass pipeline 15 is in an open state.

[0044] Furthermore, when the pressure on both sides of the first control valve 151 is balanced, the controller controls the defrosting heater 141 and the circulation device 163 to start working, so that the refrigerant flows continuously in the defrosting circuit, 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.

[0045] Specifically, if the controller opens the first control valve 151 and connects the liquid storage tank 161 to the evaporator 14, then the controller can disconnect the liquid storage tank 161 from the evaporator 14 and connect the circulation device 163 to the evaporator 14, allowing the refrigerant to circulate between the evaporator 14 and the circulation device 163. Alternatively, the circulation device 163 can be connected to the liquid storage tank 161 so that the refrigerant flows sequentially through the evaporator 14, the circulation device 163, and the liquid storage tank 161, and finally returns to the evaporator 14.

[0046] During the defrosting process of the evaporator, the defrosting heater 141 continues to operate to prevent the frost layer on the evaporator 14 from completely melting. The first detection unit 142 monitors the temperature of the evaporator 14 in real time, and the defrosting heater 141 stops operating when the temperature of the evaporator 14 reaches a preset value.

[0047] In this embodiment, if the controller opens the first control valve 151 and connects the liquid storage tank 161 and the evaporator 14, then when the temperature of the evaporator 14 reaches the preset value and the defrosting heater 141 stops working, the controller connects the circulation device 163 and the liquid storage tank 161 to divert the refrigerant in the evaporator 14 to the liquid storage tank 161.

[0048] In addition, to ensure that the remaining amount of refrigerant in the evaporator 14 is sufficient to meet the refrigeration demand, and also to prevent the refrigerant introduced into the liquid receiver 161 from exceeding the capacity of the liquid receiver 161, it is necessary to monitor the refrigerant pressure and / or temperature in the liquid receiver 161 during the refrigerant flow process. Therefore, the refrigeration system 10 also includes a second monitoring unit 164 for monitoring the refrigerant pressure and / or temperature in the liquid receiver 161.

[0049] When the second monitoring unit 164 detects that the pressure and / or temperature inside the liquid storage tank 161 meets the preset value, it controls the connection between the circulation device 163 and the liquid storage tank 161 to be disconnected, and controls the second control valve 162 to make the second pipeline 16 in the disconnected state.

[0050] In summary, 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 161 to determine whether the refrigerant introduced into the storage tank 161 exceeds its capacity. Therefore, all solutions that are the same as or similar to this embodiment are covered within the scope of protection of this invention.

[0051] like Figure 2 As shown, an embodiment of the present invention also provides a defrosting control method for a refrigeration device, the defrosting control method comprising the following steps:

[0052] S10, control the compressor 11 to stop working, control the bypass pipe 15 connected in parallel with the throttling device 13 to be in a connected state, so that the refrigerant in the refrigeration pipe flows into the evaporator 14, and record the duration S1 of the bypass pipe 15 being in a connected state, wherein the refrigerant flow resistance in the bypass pipe 15 is less than the refrigerant flow resistance in the throttling device 13.

[0053] Specifically, when the evaporator 14 in the refrigeration equipment needs defrosting, the controller controls the compressor 11 to stop working and controls the first control valve 151 to open, thus connecting the bypass line 15 and allowing refrigerant in the condenser to flow into the evaporator 14. Since the refrigerant flow resistance in the bypass line 15 is less than the refrigerant flow resistance in the throttling device 13, the refrigerant in the condenser 12 gradually flows into the evaporator 14, and the pressure on both sides of the first control valve 151 gradually reaches equilibrium, at which point the refrigerant in the refrigeration line no longer flows into the evaporator 14.

[0054] In addition, when the controller controls the compressor 11 to stop working and controls the first control valve 151 to open, it can simultaneously control the liquid storage tank 161 to connect with the evaporator 14, so that the refrigerant in the liquid storage tank 161 flows into the evaporator 14, thereby avoiding the evaporator 14 from getting too hot during the defrosting process, reducing heat loss to the storage compartment, and avoiding affecting the preservation of food in the refrigeration equipment.

[0055] S20, determine whether the duration S1 is greater than or equal to the preset value S2 of refrigerant flow duration;

[0056] If the duration S1 ≥ S2, then the bypass pipe 15 is controlled to be in the disconnected state; otherwise, the bypass pipe 15 remains in the connected state.

[0057] During the defrosting process of the evaporator 14, when the pressure on both sides of the first control valve 151 is balanced, the phenomenon that the refrigerant in the refrigeration pipeline no longer flows to the evaporator 14 is not easily observed directly. Therefore, in this embodiment, the comparison between the duration S1 of the bypass pipeline 15 being in the connected state and the preset value S2 of the refrigerant flow duration is mainly used to determine whether the pressure on both sides of the first control valve 151 is balanced and whether the refrigerant in the refrigeration pipeline no longer flows to the evaporator 14.

[0058] According to experimental tests, the preset value S2 for the refrigerant flow time can be set to 5-10 minutes. In this embodiment, the preset value S2 for the refrigerant flow time is set to 5 minutes.

[0059] Furthermore, if in step S10 the liquid storage tank 161 is connected to the evaporator 14 so that the refrigerant in the liquid storage tank 161 flows into the evaporator 14, then while controlling the bypass pipe 15 to be in the disconnected state, the connection between the liquid storage tank 161 and the evaporator 14 can be disconnected, and the circulation device 163 can be connected to the evaporator 14. Of course, those skilled in the art will readily realize that the circulation device 163 can be connected to the liquid storage tank 161, so that the refrigerant in the defrosting circuit flows sequentially through the evaporator 14, the circulation device 163, and the liquid storage tank 161, and finally returns to the evaporator 14, thereby preventing the evaporator 14 from becoming too hot during the defrosting process and avoiding affecting the preservation of food in the refrigeration equipment.

[0060] S30, control the defrost heater 141 used to defrost the evaporator, start the circulation device 163 used to drive the refrigerant flow in the defrost circuit, and monitor the temperature T1 of the evaporator 14.

[0061] Specifically, after the bypass pipe 15 is disconnected, the defrost heater 141 is controlled to operate, and the circulation device 163 is activated to accelerate the flow of refrigerant in the defrost circuit. The circulation device 163 can prevent the evaporator 14 from becoming too hot locally during the defrosting process, prevent heat from escaping into the storage compartment, and thus prevent it from affecting the preservation of food in the refrigeration equipment.

[0062] S40, determine whether the temperature T1 is greater than or equal to the preset evaporator temperature T2;

[0063] When T1≥T2, the defrosting heater is stopped.

[0064] Specifically, during the defrosting process of the evaporator 14, the first detection 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.

[0065] 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.

[0066] Experimental tests show that the preset evaporator temperature T2 can be set between 2 and 6 degrees Celsius. In this embodiment, the preset evaporator temperature T2 is set to 2 degrees Celsius.

[0067] S50, control circulation device 163 stops working.

[0068] In the above defrosting control method, if in step S10 the liquid receiver 161 is connected to the evaporator 14 so that the refrigerant in the liquid receiver 161 flows into the evaporator 14, then after "controlling the defrosting heater to stop working" in step S40, it is necessary to connect the circulation device 163 to the liquid receiver 161 to divert the refrigerant in the evaporator 14 to the liquid receiver, and monitor whether the pressure and / or temperature of the refrigerant in the liquid receiver meets the preset value, so as to avoid the refrigerant introduced into the liquid receiver 161 exceeding the capacity of the liquid receiver.

[0069] In this embodiment, as Figure 3 As shown, the above-mentioned "monitoring whether the pressure and / or temperature of the refrigerant in the liquid storage tank meets the preset value" specifically includes:

[0070] S61, monitor the temperature T3 of the refrigerant in the liquid storage 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 circulation device 163 and the liquid storage tank 161 are connected to guide the refrigerant in the evaporator 14 to the liquid storage tank 161. At the same time, the second detection unit 164 monitors the temperature T3 of the refrigerant in the liquid storage tank 161.

[0072] S62, determine whether the temperature T3 is greater than or equal to the preset temperature T4 inside the storage tank;

[0073] S63, when the temperature T3≥T4, the connection between the control circulation device and the storage tank is disconnected.

[0074] Specifically, when the temperature T3≥T4, the remaining amount of refrigerant in the evaporator 14 can meet the refrigerant requirements of the refrigeration system 10 during the refrigeration process. At this time, the controller can control the circulation device 163 and the liquid storage tank 161 to disconnect, and control the second control valve 162 to make the second pipeline 16 disconnected.

[0075] Experimental tests show that the preset temperature T4 inside the liquid storage tank can be set to 3–8 degrees Celsius. In this embodiment, the preset temperature T4 inside the liquid storage tank is set to 5 degrees Celsius.

[0076] In another embodiment of the invention, such as Figure 3 As shown, the above-mentioned "monitoring whether the pressure and / or temperature of the refrigerant in the liquid storage tank meets the preset value" specifically includes:

[0077] S71, monitor the pressure P1 of the refrigerant 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 circulation device 163 and the liquid storage tank 161 are connected to guide the refrigerant in the evaporator 14 to the liquid storage tank 161. At the same time, the second detection unit 164 monitors the pressure P1 of the refrigerant in the liquid storage tank 161.

[0079] S72, determine whether the pressure P1 is greater than or equal to the preset pressure value P2 in the liquid storage tank;

[0080] S73, when pressure P1≥P2, the connection between the control circulation device and the storage tank is disconnected.

[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 circulation device 163 and the liquid storage tank 161 to disconnect, and control the second control valve 162 to make the second pipeline 16 in the disconnected state.

[0082] According to experimental tests, the preset pressure value P2 inside the liquid storage tank can be set to 0.15–0.3 MPa. In this embodiment, the preset pressure value P2 inside the liquid storage tank is set to 0.21 MPa.

[0083] In summary, those skilled in the art will readily recognize that when monitoring whether the refrigerant in the return storage tank 161 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 this invention are as follows: By introducing refrigerant from the refrigeration pipeline into the evaporator 14 during the defrosting process, this invention avoids large temperature fluctuations in the evaporator 14 during defrosting, reduces heat loss to the surrounding storage compartments, and thus prevents food stored in the refrigeration equipment from spoiling or losing nutrients. Furthermore, the circulation device 163 accelerates the flow of refrigerant in the defrosting circuit, preventing excessively high local temperatures in the evaporator 14 during defrosting 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 and the bypass line connected in parallel with the throttling device is kept in a connected state so that the refrigerant in the refrigeration line flows into the evaporator. The duration S1 of the bypass line being in a connected state is recorded, wherein the refrigerant flow resistance in the bypass line is less than the refrigerant flow resistance in the throttling device. 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 bypass pipeline is controlled to be in the disconnected state; otherwise, the bypass pipeline remains in the connected state. The defrost heater used to defrost the evaporator is controlled to operate, the circulation device used to drive the refrigerant flow in the defrost circuit is turned on, and the temperature T1 of the evaporator is monitored; wherein, the defrost circuit consists of a first pipe connected in parallel with the evaporator and the evaporator. Determine whether the temperature T1 is greater than or equal to the preset evaporator temperature T2; When T1≥T2, the defrosting heater is stopped. The control circulation device stops working.

2. The defrosting control method for refrigeration equipment according to claim 1, characterized in that, The preset value S2 for the refrigerant flow time is set to 5~10 minutes.

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 defrosting control method further includes: After "controlling the compressor to stop working", while the bypass line connected in parallel with the control and throttling device is in the connected state, simultaneously: Control the connection between the liquid receiver tank and the evaporator so that the refrigerant in the liquid receiver tank flows into the evaporator; After the above "control defrosting heater to stop working": The circulation device is connected to the liquid storage tank to allow the refrigerant in the evaporator to flow back to the liquid storage tank, and the pressure and / or temperature of the refrigerant in the liquid storage tank are monitored to ensure they meet preset values.

5. The defrosting control method for refrigeration equipment according to claim 4, characterized in that, The above step of "monitoring whether the pressure and / or temperature of the refrigerant in the liquid receiver tank meets the preset value" specifically includes: Monitor the temperature T3 of the refrigerant in the liquid storage tank; Determine whether temperature T3 is greater than or equal to the preset temperature value T4 inside the storage tank; When the temperature T3 ≥ T4, the connection between the control circulation device and the storage tank is disconnected.

6. The defrosting control method for refrigeration equipment according to claim 5, characterized in that, The preset temperature T4 inside the liquid storage tank is set to 3~8 degrees Celsius.

7. The defrosting control method for refrigeration equipment according to claim 4, characterized in that, The above step of "monitoring whether the pressure and / or temperature of the refrigerant in the liquid receiver tank meets the preset value" specifically includes: Monitor the refrigerant pressure P1 in the liquid storage 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 control circulation device and the storage tank is disconnected.

8. The defrosting control method for refrigeration equipment according to claim 7, characterized in that, The preset pressure P2 inside the liquid storage tank is set to 0.15~0.3 MPa.

9. 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 further includes a bypass pipeline connected in parallel with the throttling device, a first control valve for controlling the opening or closing of the bypass pipeline, a defrosting heater for defrosting the evaporator, a first pipeline connected in parallel with the evaporator, a liquid receiver connected to the first pipeline, a second control valve for controlling the opening or closing of the first pipeline, and a first monitoring unit for monitoring the evaporator temperature; wherein, when the first control valve is open and the second control valve is closed, the evaporator and the first pipeline form a defrosting circuit, and the first pipeline is provided with a circulation device for driving the refrigerant flow in the defrosting circuit, and the second control valve can control the connection between the circulation device, the liquid receiver, and the evaporator respectively.

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

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