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CN-224215607-U - Refrigerant circulation control system and air conditioning equipment

CN224215607UCN 224215607 UCN224215607 UCN 224215607UCN-224215607-U

Abstract

The application provides a refrigerant circulation control system and air conditioning equipment, which relate to the technical field of air conditioning, and are characterized in that a first circulation loop is formed by a first circulation branch, a compressor and an oil separator, a second circulation loop is formed by a second circulation branch, a refrigerant in the refrigerant circulation control system circulates through the first circulation loop when a first control valve is opened and an electronic expansion valve and a second control valve are closed, so that the compressor is preheated, the refrigerant circulates through the first circulation loop and the second circulation loop when the first control valve, the electronic expansion valve and the second control valve are opened, the refrigerant circulation of the whole system is gradually driven after the compressor is preheated, a large amount of liquid refrigerant enters a compression cavity of the compressor in a short time, the low-temperature starting liquid return risk of the compressor is reduced, and when the first control valve is closed and the electronic expansion valve and the second control valve are both opened, the refrigerant in the refrigerant circulation control system circulates through the second circulation loop, so that energy conservation and emission reduction are realized.

Inventors

  • ZHU FENGQI
  • LIU JINGJING
  • LEI QINHUI
  • JIN MENGMENG
  • GAO HAN

Assignees

  • 珠海格力电器股份有限公司

Dates

Publication Date
20260508
Application Date
20250521

Claims (10)

  1. 1. The refrigerant circulation control system is characterized by comprising a refrigerant circulation main path, a first circulation branch path and a second circulation branch path; The first circulation branch is provided with a first control valve, the second circulation branch is provided with an electronic expansion valve, and the refrigerant circulation main is provided with a compressor, an oil separator, a second control valve and a vapor-liquid separator; The inlet of the first circulation branch is connected between the outlet of the oil separator and the second control valve, the inlet of the second circulation branch is communicated with the outlet of the vapor-liquid separator, and the outlet of the first circulation branch, the outlet of the second circulation branch and the inlet of the compressor are communicated; When the first control valve is opened and the electronic expansion valve and the second control valve are closed, the refrigerant in the refrigerant circulation control system circulates through the first circulation loop; When the first control valve, the electronic expansion valve and the second control valve are all opened, the refrigerant in the refrigerant circulation control system circulates through the first circulation loop and the second circulation loop; When the first control valve is closed and the electronic expansion valve and the second control valve are both opened, the refrigerant in the refrigerant circulation control system circulates through the second circulation loop.
  2. 2. The refrigerant cycle control system according to claim 1, wherein the second cycle branch is further provided with a first check valve, an inlet of the first check valve being in communication with an outlet of the electronic expansion valve, an outlet of the first check valve being in communication with an outlet of the first cycle branch and an inlet of the compressor.
  3. 3. The refrigerant cycle control system as set forth in claim 1, further comprising a control device electrically connected to said first control valve, said second control valve and said electronic expansion valve, respectively; The control device is used for controlling the refrigerant circulation control system to enter a target starting mode according to the ambient temperature detection information under the condition that the compressor is started, determining the current exhaust superheat degree according to the exhaust pressure and the exhaust temperature of the compressor, and controlling the starting operation state of the refrigerant circulation control system according to the current exhaust superheat degree and the opening degree of the electronic expansion valve.
  4. 4. The refrigerant cycle control system according to claim 3, wherein the refrigerant cycle main line is further provided with a pressure sensor and an exhaust temperature sensing bulb; the pressure sensor is used for detecting the discharge pressure of the compressor; the exhaust temperature sensing bulb is used for detecting the exhaust temperature of the compressor; The control device is also used for adjusting the opening of the electronic expansion valve according to the current exhaust superheat degree.
  5. 5. The refrigerant cycle control system as set forth in claim 3, wherein said ambient temperature detection information includes an ambient temperature and a downtime corresponding to said ambient temperature; the refrigerant circulation main path is provided with an environment temperature sensing bulb between the second control valve and the inlet of the vapor-liquid separator, wherein the environment temperature sensing bulb is used for detecting the environment temperature; The control of the refrigerant circulation control system to enter a target starting mode according to the environment temperature detection information comprises the steps of determining that the environment temperature detection information meets a preset mode triggering condition when the environment temperature is smaller than a preset temperature threshold corresponding to the target starting mode and the downtime reaches a preset downtime threshold corresponding to the preset downtime threshold, and controlling the refrigerant circulation control system to enter a first operation stage of the target starting mode when the environment temperature detection information meets the preset mode triggering condition.
  6. 6. The refrigerant circulation system according to claim 1, wherein the refrigerant circulation main path is provided with a first heat exchanger between the second control valve and an inlet of the vapor-liquid separator, and an inlet of the first heat exchanger communicates with an outlet of the second control valve.
  7. 7. The refrigerant cycle system as recited in claim 6, wherein said refrigerant cycle main circuit is further provided with a first valve, said first valve being disposed between an outlet of said first heat exchanger and an inlet of said vapor-liquid separator.
  8. 8. The refrigerant circulation system according to claim 7, wherein the refrigerant circulation main line is further provided with a second valve and a second heat exchanger; the second heat exchanger is arranged between the outlet of the first valve and the inlet of the second valve, and the outlet of the second valve is communicated with the inlet of the vapor-liquid separator.
  9. 9. The refrigerant circulation system according to any one of claims 1 to 8, wherein the first circulation branch is further provided with a second check valve, an inlet of the second check valve is communicated with an outlet of the first control valve, and an outlet of the second check valve is communicated with an inlet of the compressor.
  10. 10. An air conditioning apparatus, characterized in that the air conditioning apparatus includes the refrigerant cycle control system according to any one of claims 1 to 9.

Description

Refrigerant circulation control system and air conditioning equipment Technical Field The present application relates to the field of air conditioning technologies, and in particular, to a refrigerant circulation control system and an air conditioning apparatus. Background At present, the multi-split system has various advantages, can meet the requirements of different scenes, and is widely applied in various fields. However, as the multi-split system is generally larger, the required refrigerant filling amount is correspondingly larger, namely the refrigerant filling amount of the multi-split system is larger, the risk of liquid return of the air conditioner compressor is obviously increased, and particularly when the multi-split system is used in a cold area, the liquid return condition is more serious. In order to alleviate the problem of liquid return of an air conditioner compressor, the existing common method mainly comprises the step of adding an oil heating belt on the compressor. Before low-temperature start, the refrigerant and oil at the bottom of the compressor are heated through the oil heating belt, so that the liquid return risk of the start of the compressor is relieved, and the liquid return risk of the compressor in the low-temperature start process is reduced. However, the preheating time of the existing oil heating belt preheating scheme is too long, and the normal operation of the oil heating belt must be ensured in a low-temperature state, so that a large amount of energy is wasted, and the energy conservation and emission reduction are not facilitated. Disclosure of Invention In view of the above, the application provides a refrigerant circulation control system and air conditioning equipment, which are used for solving the problem of resource waste caused by starting liquid return of an air conditioner compressor by adopting oil heating belt preheating in the prior art. According to a first aspect of an embodiment of the present application, there is provided a refrigerant circulation control system, including a refrigerant circulation main path, a first circulation branch path, and a second circulation branch path; The first circulation branch is provided with a first control valve, the second circulation branch is provided with an electronic expansion valve, and the refrigerant circulation main is provided with a compressor, an oil separator, a second control valve and a vapor-liquid separator; The inlet of the first circulation branch is connected between the outlet of the oil separator and the second control valve, the inlet of the second circulation branch is communicated with the outlet of the vapor-liquid separator, and the outlet of the first circulation branch, the outlet of the second circulation branch and the inlet of the compressor are communicated; When the first control valve is opened and the electronic expansion valve and the second control valve are closed, the refrigerant in the refrigerant circulation control system circulates through the first circulation loop; When the first control valve, the electronic expansion valve and the second control valve are all opened, the refrigerant in the refrigerant circulation control system circulates through the first circulation loop and the second circulation loop; When the first control valve is closed and the electronic expansion valve and the second control valve are both opened, the refrigerant in the refrigerant circulation control system circulates through the second circulation loop. In an alternative embodiment, the second circulation branch is further provided with a first non-return valve, the inlet of which communicates with the outlet of the electronic expansion valve, and the outlet of which communicates with the outlet of the first circulation branch and with the inlet of the compressor. In an alternative embodiment, the refrigerant circulation control system further comprises a control device, wherein the control device is respectively and electrically connected with the first control valve, the second control valve and the electronic expansion valve; The control device is used for controlling the refrigerant circulation control system to enter a target starting mode according to the ambient temperature detection information, determining the current exhaust superheat degree according to the exhaust pressure and the exhaust temperature of the compressor, and controlling the starting operation state of the refrigerant circulation control system according to the current exhaust superheat degree and the opening degree of the electronic expansion valve. In an alternative embodiment, the refrigerant circulation main path is further provided with a pressure sensor and an exhaust temperature sensing bulb, the pressure sensor is used for detecting the exhaust pressure of the compressor, the exhaust temperature sensing bulb is used for detecting the exhaust temperature of the compressor, and the control device is furthe