CN-118816374-B - Control method and control device for heat exchange system and heat exchange system

CN118816374BCN 118816374 BCN118816374 BCN 118816374BCN-118816374-B

Abstract

The application relates to the technical field of heat exchange systems and discloses a control method for a heat exchange system, wherein the heat exchange system comprises a heat exchange loop, a control circuit and a control circuit, wherein the heat exchange loop comprises a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger which are sequentially connected; the control method comprises the steps of obtaining the current outdoor environment temperature, determining the refrigerant demand in the operation process according to the outdoor environment temperature, and adjusting the refrigerant storage capacity of the refrigerant adjusting branch according to the refrigerant demand. According to the outdoor environment temperature, the refrigerant demand in operation can be accurately determined, the refrigerant quantity participating in heat exchange circulation in the heat exchange system can be regulated according to actual operation demand, and the performance of the heat exchange system is improved. The application also discloses a control device for the heat exchange system and the heat exchange system.

Inventors

XU WENMING
WANG FEI
DAI CHUANMIN
LI YANG
JIANG JUN

Assignees

青岛海尔空调器有限总公司
青岛海尔空调电子有限公司
青岛海尔智能技术研发有限公司
海尔智家股份有限公司

Dates

Publication Date: 20260512
Application Date: 20230731
Priority Date: 20230421

Claims (10)

1. A control method for a heat exchange system is characterized by comprising a heat exchange loop, a gas-liquid separation device, a first control valve, a second control valve and a control method, wherein the heat exchange loop comprises a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger which are sequentially connected, the gas-liquid separation device is arranged at a liquid storage end of a refrigerant adjusting branch, the gas-liquid separation device comprises a three-way pipe, a first pipe section of the three-way pipe is connected to one side close to the throttle, a second pipe section of the three-way pipe is connected with the heat exchanger, a third pipe section of the three-way pipe is connected with a refrigerant inlet of the liquid storage device, the third pipe section is arranged above the second pipe section, an upward opening folding angle is formed between the third pipe section and the first pipe section, the refrigerant adjusting branch comprises a liquid storage end and a gas supplementing end, the liquid storage end of the refrigerant adjusting branch is connected with a gas return port of the compressor, the liquid storage device is configured to store, the first control valve is arranged at the liquid storage end of the refrigerant adjusting branch and is connected with the gas supplementing port of the liquid storage device, and the control method comprises the steps of: Obtaining a current outdoor environment temperature; determining the refrigerant demand in the running process according to the outdoor environment temperature; according to the demand of the refrigerant, the refrigerant storage capacity of the refrigerant regulating branch is regulated; The method comprises the steps of obtaining suction pressure of a suction port of a compressor when a current operation working condition is a heating working condition and an outdoor environment temperature is smaller than a lower limit threshold value of the environment temperature, controlling a first control valve to be opened to a first opening degree when the suction pressure is smaller than a first pressure threshold value, and controlling a second control valve to be opened to a second opening degree after a second time interval, wherein the first opening degree is smaller than a full opening degree, and the second opening degree is smaller than the full opening degree.
2. The control method according to claim 1, wherein the refrigerant demand during operation is determined based on an outdoor ambient temperature, further comprising: Under the condition that the current operation working condition is a refrigeration working condition, if the outdoor environment temperature is greater than the upper limit threshold value of the environment temperature, determining the refrigerant demand as a first demand; And if the outdoor ambient temperature is less than or equal to the upper limit threshold of the ambient temperature, determining that the refrigerant demand is less than the first demand.
3. The control method according to claim 2, wherein adjusting the refrigerant reserve of the refrigerant adjusting branch according to the demand of the refrigerant includes: When the refrigerant demand is the first demand, the first control valve and the second control valve are controlled to be kept closed; and under the condition that the refrigerant demand is smaller than the first demand, controlling the first control valve and the second control valve to be opened, wherein the opening degree of the first control valve is larger than that of the second control valve.
4. The control method according to claim 3, wherein determining that the required amount of the refrigerant is smaller than the first required amount if the outdoor ambient temperature is smaller than or equal to an upper threshold of the ambient temperature includes: determining the refrigerant demand as a second demand under the condition that the outdoor ambient temperature is less than or equal to an upper limit threshold of the ambient temperature and greater than a first temperature threshold; Determining the refrigerant demand as a third demand under the condition that the outdoor ambient temperature is less than or equal to a first temperature threshold; the second demand is smaller than the first demand and larger than the third demand.
5. A control method according to claim 3, characterized by controlling the first control valve and the second control valve to be opened, further comprising: Determining the opening time according to the refrigerant demand; And after the opening time of the first control valve reaches the opening time, controlling the second control valve to be closed.
6. The control method according to any one of claims 1 to 5, wherein determining the refrigerant demand during operation based on the outdoor ambient temperature includes: Under the condition that the current operation working condition is a heating working condition, if the outdoor environment temperature is smaller than the lower limit threshold value of the environment temperature, determining the refrigerant demand as a first demand; And if the outdoor ambient temperature is greater than or equal to the lower limit threshold of the ambient temperature, determining that the refrigerant demand is less than the first demand.
7. The control method according to claim 6, wherein determining that the refrigerant demand is smaller than the first demand if the outdoor ambient temperature is greater than or equal to a lower threshold of the ambient temperature, comprises: Determining the refrigerant demand as a fourth demand under the condition that the outdoor ambient temperature is greater than or equal to a lower limit threshold of the ambient temperature and less than a second temperature threshold; Determining the refrigerant demand as a fifth demand under the condition that the outdoor ambient temperature is greater than or equal to a second temperature threshold; the fourth demand is smaller than the first demand and larger than the fifth demand.
8. A control device for a heat exchange system comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the control method for a heat exchange system according to any one of claims 1 to 7 when the program instructions are run.
9. A heat exchange system, comprising: the heat exchange loop comprises a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger which are sequentially connected; The refrigerant adjusting branch comprises a liquid storage end and a gas supplementing end, the liquid storage end of the refrigerant adjusting branch is connected with a heat exchange loop between the throttle and the indoor heat exchanger, and the gas supplementing end of the refrigerant adjusting branch is connected with a gas return port of the compressor; The control device for a heat exchange system according to claim 8.
10. The heat exchange system of claim 9, wherein the refrigerant conditioning branch comprises: A liquid storage device configured to store a refrigerant; The first control valve is arranged at the liquid storage end of the refrigerant adjusting branch and is connected with the liquid storage port of the liquid storage device; The second control valve is arranged at the air supplementing end of the refrigerant adjusting branch and is connected with the air supplementing port of the liquid storage device.

Description

Control method and control device for heat exchange system and heat exchange system The present application claims priority from chinese patent application No. 202310438282.2, filed under the name "refrigeration system and air conditioner" No. 2023, 4, 21, the entire contents of which are incorporated herein by reference. Technical Field The application relates to the technical field of heat exchange systems, and for example relates to a control method and device for a heat exchange system and the heat exchange system. Background Refrigerant in the air conditioning system circularly flows in the system to realize a refrigerating operation or heating operation mode. When the air conditioner operates in a refrigerating mode with different loads or a heating mode with different loads, the optimal refrigerant circulation amount required by the heat exchange system is different, but for the heat exchange system, the refrigerant filling amount is fixed, when the refrigerating outside is high-temperature or the heating outside is low-temperature, the rated refrigerant amount can enable the air conditioner system to operate in an overload mode, so that the refrigerating or heating effect is poor, and when the refrigerating outside is low-temperature or the heating outside is high-temperature, the air conditioner system operates in a low-load mode, the refrigerant amount can be in a situation that the allowance is too much, and the part of refrigerant does not play a role in heat exchange in the system operation, so that the operation energy efficiency of the temperature regulating equipment unit is low, and the optimal performance of the heat exchange system cannot be exerted. The related art discloses a control method for a heat exchange system, which comprises the steps of adjusting the opening of a throttle to adjust the refrigerant in the cold heat exchange system, and reducing, reducing or increasing the pressure and the temperature of the refrigerant, so that the refrigerant state meets the requirements of an indoor heat exchanger, and the heat exchange system is in a relatively better state. In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: Because the opening adjustment capability of the throttle is limited, the adjustment range is smaller, and when the difference of the refrigerants required by the heat exchange system is larger, the throttle can not meet the adjustment requirement of the refrigerants, and the performance of the heat exchange system is poorer. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the application and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview, and is intended to neither identify key/critical elements nor delineate the scope of such embodiments, but is intended as a prelude to the more detailed description that follows. The embodiment of the disclosure provides a control method, a control device and a heat exchange system for a heat exchange system, so as to adjust the quantity of refrigerants participating in heat exchange circulation in the heat exchange system and improve the performance of the heat exchange system. In some embodiments, the heat exchange system comprises a heat exchange loop, a refrigerant adjusting branch, a control system and a control method, wherein the heat exchange loop comprises a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger which are sequentially connected, the refrigerant adjusting branch comprises a liquid storage end and a gas supplementing end, the liquid storage end of the refrigerant adjusting branch is connected with the heat exchange loop between the throttle and the indoor heat exchanger, the gas supplementing end of the refrigerant adjusting branch is connected with a gas return port of the compressor, the control method comprises the steps of obtaining the current outdoor environment temperature, determining the refrigerant demand in the operation process according to the outdoor environment temperature, and adjusting the refrigerant storage of the refrigerant adjusting branch according to the refrigerant demand. Optionally, determining the refrigerant demand in the operation process according to the outdoor environment temperature comprises determining that the refrigerant demand is a first demand if the outdoor environment temperature is greater than an upper threshold of the environment temperature and determining that the refrigerant demand is less than the first demand if the outdoor environment temperature is less than or equal to the upper thr