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CN-116558164-B - Defrosting control method of refrigeration equipment and refrigeration equipment

CN116558164BCN 116558164 BCN116558164 BCN 116558164BCN-116558164-B

Abstract

The invention provides a defrosting control method of refrigeration equipment and the refrigeration equipment, the defrosting control method comprises the steps of controlling a compressor to stop working, communicating a liquid storage tank with a condenser to enable refrigerant in the liquid storage tank to flow into the evaporator, judging whether the duration S 1 of the communication between the liquid storage tank and the condenser is greater than or equal to a preset value S 2 of the flowing duration of the refrigerant, controlling the connection between the liquid storage tank and the condenser to be disconnected when the duration S 1 ≥S 2 is reached, controlling a defrosting heater to work, starting a circulating device for driving the refrigerant in a defrosting loop to flow, judging whether the temperature T 1 of the evaporator is greater than or equal to a preset value T 2 of the temperature of the evaporator, controlling the defrosting heater and the circulating device to stop working when the temperature T 1 ≥T 2 is reached, and controlling the compressor to be communicated with the liquid storage tank. According to the invention, the refrigerant in the liquid storage tank is introduced into the evaporator in the defrosting process, and the circulation device is utilized to accelerate the flow of the refrigerant in the defrosting loop, so that the local temperature of the evaporator is prevented from being high in defrosting, and the food preservation in the refrigeration equipment is prevented from being influenced.

Inventors

  • JIANG FENG

Assignees

  • 青岛海尔电冰箱有限公司
  • 海尔智家股份有限公司

Dates

Publication Date
20260512
Application Date
20220128

Claims (9)

  1. 1. A defrosting control method of a refrigeration device, characterized by comprising the steps of: The compressor is controlled to stop working, the liquid storage tank is communicated with the condenser, a bypass pipeline connected in parallel with the throttling device is controlled to be in a communication state, so that the refrigerant in the liquid storage tank flows into the evaporator along the refrigeration pipeline, and the communication duration S 1 between the liquid storage tank and the condenser is recorded; Judging whether the duration S 1 is greater than or equal to a preset value S 2 of the refrigerant flow duration; If the duration S 1 ≥S 2 is longer, the connection between the liquid storage tank and the condenser is controlled to be disconnected, otherwise, the liquid storage tank and the condenser are continuously communicated; Controlling a defrosting heater for defrosting an evaporator to work, starting a circulating device for driving a refrigerant in a defrosting loop to flow, and monitoring the temperature T 1 of the evaporator; judging whether the temperature T 1 is more than or equal to an evaporator temperature preset value T 2 ; At T 1 ≥T 2 , controlling the defrosting heater and the circulating device to stop working; The control compressor is in communication with the liquid storage tank to drain refrigerant in the evaporator to the liquid storage tank.
  2. 2. The defrosting control method of a refrigeration apparatus according to claim 1, characterized in that the defrosting control method further comprises: And when the connection between the liquid storage tank and the condenser is controlled to be disconnected, simultaneously controlling a bypass pipeline connected with the throttling device in parallel to be in a disconnected state.
  3. 3. The defrosting control method of a refrigeration device according to claim 1, wherein the evaporator temperature preset value T 2 is set to 2-6 ℃.
  4. 4. The defrosting control method of a refrigeration apparatus according to claim 1, wherein the step of controlling the compressor to communicate with the liquid tank to drain the refrigerant in the evaporator to the liquid tank specifically comprises: Controlling the compressor to work, controlling the compressor to be communicated with the liquid storage tank, simultaneously disconnecting the compressor from the condenser, and monitoring the temperature T 3 of the refrigerant in the liquid storage tank; Judging whether the temperature T 3 is more than or equal to a preset temperature value T 4 in the liquid storage tank; And when the temperature is T 3 ≥T 4 , controlling the connection and disconnection of the compressor and the liquid storage tank, and controlling the compressor to be communicated with the condenser.
  5. 5. The defrosting control method of refrigeration equipment according to claim 4, wherein the preset temperature value T 4 in the liquid storage tank is set to be 25-35 ℃.
  6. 6. The defrosting control method of a refrigeration apparatus according to claim 1, wherein the step of controlling the compressor to communicate with the liquid tank to drain the refrigerant in the evaporator to the liquid tank specifically comprises: Controlling the compressor to work, controlling the compressor to be communicated with the liquid storage tank, simultaneously disconnecting the compressor from the condenser, and monitoring the pressure P 1 of the refrigerant in the liquid storage tank; Judging whether the pressure P 1 is larger than or equal to a preset pressure value P 2 in the liquid storage tank; And when the pressure P 1 ≥P 2 is high, the connection between the compressor and the liquid storage tank is controlled to be disconnected, and the compressor is controlled to be communicated with the condenser.
  7. 7. The defrosting control method of a refrigeration apparatus according to claim 6, wherein the preset pressure P 2 in the liquid storage tank is set to 0.7 to 0.9 mpa.
  8. 8. The refrigeration equipment comprises a refrigeration system, wherein the refrigeration system comprises a compressor, a condenser, a throttling device and an evaporator which are sequentially connected end to end, and is characterized by comprising a defrosting heater for defrosting the evaporator, a first monitoring unit for monitoring the temperature of the evaporator, a first pipeline connected with the evaporator in parallel, a second pipeline for communicating the compressor with the condenser, a liquid storage tank connected with the second pipeline, a first control valve for connecting the liquid storage tank with the second pipeline, a bypass pipeline connected with the throttling device in parallel and a second control valve for controlling the communication or disconnection of the bypass pipeline; In the defrosting process of the evaporator, the evaporator and the first pipeline form a defrosting loop, a circulating device for driving the refrigerant in the defrosting loop to flow is arranged on the first pipeline, and the first control valve can respectively control the connection of any two of the compressor, the liquid storage tank and the condenser.
  9. 9. The refrigeration appliance of claim 8 wherein the refrigeration system further includes a second monitoring unit for monitoring the pressure and/or temperature of the refrigerant in the liquid storage tank.

Description

Defrosting control method of refrigeration equipment and refrigeration equipment Technical Field The invention relates to the technical field of refrigeration equipment, in particular to a defrosting control method of refrigeration equipment and the refrigeration equipment. Background In the prior art, after an evaporator in refrigeration equipment refrigerates for a long time, water vapor on the surface of the evaporator gradually condenses into frost, the thickness of the frost gradually increases along with the increment of refrigeration time, and then the frost blockage of the evaporator is caused, which leads to the phenomenon of poor refrigeration or no refrigeration, The existing refrigeration equipment generally adopts a heater to heat and defrost. Specifically, when the frosting quantity on the evaporator reaches a certain quantity, the compressor in the refrigeration equipment is controlled to stop running so as to stop refrigeration of the refrigeration system, the heater is controlled to be electrified to start heating and defrosting, and when the frosting on the surface of the evaporator is melted, the compressor is controlled to restart running so as to restart refrigeration of the refrigeration system. The inventor finds that at least the following technical problems exist in the prior art, namely, in the defrosting process, as the refrigerating system stops refrigerating and the heater heats, the temperature of a storage chamber of the refrigerating equipment is quickly raised, so that the temperature of food stored in the refrigerating equipment is raised, and after defrosting is finished, the temperature of the storage chamber needs to be cooled again to be reduced to the set temperature before defrosting. In the process, the temperature fluctuation in the storage chamber is large, so that the deterioration or nutrition loss of food in the storage chamber is influenced, and the storage of the food is not facilitated. Disclosure of Invention The invention provides a defrosting control method of refrigeration equipment and the refrigeration equipment, which are used for solving the technical problems that the evaporator is high in local temperature in the defrosting process in the existing refrigeration equipment and is not beneficial to food preservation in the refrigeration equipment. In order to achieve one of the above objects, an embodiment of the present invention provides a defrosting control method for a refrigeration apparatus, including the steps of: Controlling the compressor to stop working, communicating the liquid storage tank with the condenser so that the refrigerant in the liquid storage tank flows into the evaporator along a refrigerating pipeline, and recording the duration S 1 of the communication between the liquid storage tank and the condenser; Judging whether the duration S 1 is greater than or equal to a preset value S 2 of the refrigerant flow duration; If the duration S 1≥S2 is longer, the connection between the liquid storage tank and the condenser is controlled to be disconnected, otherwise, the liquid storage tank and the condenser are continuously communicated; Controlling a defrosting heater for defrosting an evaporator to work, starting a circulating device for driving a refrigerant in a defrosting loop to flow, and monitoring the temperature T 1 of the evaporator; judging whether the temperature T 1 is more than or equal to an evaporator temperature preset value T 2; And at the time of T 1≥T2, controlling the defrosting heater and the circulating device to stop working, and controlling the compressor to be communicated with the liquid storage tank so as to drain the refrigerant in the evaporator to the liquid storage tank. The preset evaporator temperature value T 2 is set to be 2-6 ℃. As a further improvement of the above technique, the defrosting control method further includes: After the compressor is controlled to stop working, when the liquid storage tank is communicated with the condenser, a bypass pipeline connected with the throttling device in parallel is controlled to be in a communication state; And when the connection between the liquid storage tank and the condenser is controlled to be disconnected, simultaneously controlling a bypass pipeline connected with the throttling device in parallel to be in a disconnected state. As a further improvement of the above technology, the step of "controlling the compressor to communicate with the liquid tank to drain the refrigerant in the evaporator to the liquid tank" specifically includes: Controlling the compressor to work, controlling the compressor to be communicated with the liquid storage tank, simultaneously disconnecting the compressor from the condenser, and monitoring the temperature T 3 of the refrigerant in the liquid storage tank; Judging whether the temperature T 3 is more than or equal to a preset temperature value T 4 in the liquid storage tank; And when the temperature is T 3≥T4, controlli