CN-116834505-B - Heat exchange system, oil return temperature control method, readable storage medium and controller

CN116834505BCN 116834505 BCN116834505 BCN 116834505BCN-116834505-B

Abstract

The application provides a heat exchange system, an oil return temperature control method, a readable storage medium and a controller, wherein the heat exchange system comprises a compressor, a first heat exchanger and a second heat exchanger which are connected in series, a battery cooler and a regulating valve connected in series between the outlet of the first heat exchanger and the inlet of the compressor, and the regulating valve and the controller are connected with the battery cooler and the first heat exchanger. The controller obtains working state information of the compressor, and in a refrigerating mode, if the running rotating speed of the compressor is lower than the set rotating speed and the running time length reaches the first time length, the regulating valve is controlled to be opened, the compressor is controlled to run at the oil return rotating speed, so that the refrigerating oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve to improve the flow rate of the refrigerating oil in the heat exchange system, and when the flow rate of the refrigerating oil in the heat exchange system is improved, the reversing inlet of the reversing valve is controlled to be at least communicated with the second reversing outlet, so that the heat load in the refrigerating fluid flows into the battery cooler, and the air outlet temperature is prevented from suddenly dropping.

Inventors

HU LEI
ZHENG XINGLIANG
XIA SONGYONG
XU JUNBO
WANG JIAN
XING XIAODONG

Assignees

浙江吉利控股集团有限公司
浙江联控技术有限公司

Dates

Publication Date: 20260512
Application Date: 20230609

Claims (13)

1. A heat exchange system, comprising: A compressor, a first heat exchanger and a second heat exchanger connected in series, the second heat exchanger being connected between an outlet of the first heat exchanger and an inlet of the compressor; a battery cooler and a regulating valve connected in series between an outlet of the first heat exchanger and an inlet of the compressor; a reversing valve comprising a reversing inlet, a first reversing outlet and a second reversing outlet, wherein the reversing inlet is connected with the outlet of the first heat exchanger, the first reversing outlet is connected with the inlet of the first heat exchanger, the second reversing outlet is connected with the inlet of the battery cooler, and the outlet of the battery cooler is connected with the inlet of the first heat exchanger, and The controller is connected with the compressor, the regulating valve and the reversing valve; the controller is used for: acquiring working state information of a compressor, wherein the working state information of the compressor comprises an operation rotating speed and an operation time length, and In the refrigeration mode, if the running rotating speed is lower than a set rotating speed and the running time length reaches a first time length, the regulating valve is controlled to be opened, the compressor is controlled to run at an oil return rotating speed higher than the set rotating speed, so that the frozen oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve, and the reversing inlet of the reversing valve is controlled to be at least communicated with the second reversing outlet, so that at least part of frozen liquid flowing out of the outlet of the first heat exchanger flows into the battery cooler through the reversing valve.
2. The heat exchange system of claim 1, further comprising: a warm air water pump connected between the outlet of the first heat exchanger and the reversing inlet for pumping the refrigerant of the first heat exchanger into the reversing valve, and/or A water pump connecting the second reversing outlet of the reversing valve and the inlet of the battery cooler for pumping chilled liquid from the second reversing outlet of the reversing valve to the battery cooler, and/or A gas-liquid separator having an inlet connected to the outlet of the second heat exchanger and the outlet of the battery cooler, the outlet of the gas-liquid separator being connected to the inlet of the compressor, and/or The heat exchange system further comprises a throttle valve connected in series with the second heat exchanger, and/or The first heat exchanger is a condenser, and the second heat exchanger is an evaporator.
3. The heat exchange system of claim 1, comprising a temperature sensor electrically connected to the controller for detecting an outlet air temperature of the heat exchange system.
4. The heat exchange system of claim 1, further comprising a temperature monitor electrically connected to the controller for detecting a temperature of the chilled oil flowing through the regulator valve.
5. The heat exchange system of claim 1, further comprising a flow detector electrically connected to the controller for detecting a flow rate of the chilled oil through the regulator valve.
6. The oil return temperature control method of the heat exchange system is characterized in that the heat exchange system comprises a compressor, a first heat exchanger, a second heat exchanger, a gas-liquid separator, a battery cooler, a regulating valve and a reversing valve, wherein the compressors, the first heat exchanger, the second heat exchanger, the gas-liquid separator, the battery cooler, the regulating valve and the reversing valve are connected in series, the battery cooler and the regulating valve are connected between the first heat exchanger and the gas-liquid separator, the reversing valve comprises a reversing inlet, a first reversing outlet and a second reversing outlet, the reversing inlet is connected with the outlet of the first heat exchanger, the first reversing outlet is connected with the inlet of the first heat exchanger, the second reversing outlet is connected with the inlet of the battery cooler, and the outlet of the battery cooler is connected with the inlet of the first heat exchanger; The oil return temperature control method comprises the following steps: acquiring working state information of a compressor, wherein the working state information of the compressor comprises an operation rotating speed and an operation time length, and In the refrigeration mode, if the running rotating speed is lower than a set rotating speed and the running time length reaches a first time length, the regulating valve is controlled to be opened, the compressor is controlled to run at an oil return rotating speed higher than the set rotating speed, so that the frozen oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve, and the reversing inlet of the reversing valve is controlled to be at least communicated with the second reversing outlet, so that at least part of frozen liquid flowing out of the outlet of the first heat exchanger flows into the battery cooler through the reversing valve.
7. The oil return temperature control method of claim 6, wherein said controlling said reversing inlet of said reversing valve to communicate with at least said second reversing outlet comprises: In the refrigeration mode, if the running rotating speed is lower than the set rotating speed and the running time length reaches the first time length, controlling the opening of the reversing valve, wherein the opening is greater than zero and less than or equal to one hundred percent; The opening degree of the reversing valve is zero, the reversing inlet is communicated with the first reversing outlet and is blocked with the second reversing outlet, so that the refrigerating fluid flowing out of the outlet of the first heat exchanger flows into the first heat exchanger; When the opening degree of the reversing valve is hundred percent, the reversing inlet is communicated with the second reversing outlet and is blocked with the first reversing outlet, so that the freezing liquid flowing out of the outlet of the first heat exchanger flows into the battery cooler; When the opening degree of the reversing valve is more than zero and less than one hundred percent, the reversing inlet of the reversing valve is communicated with the second reversing outlet and is communicated with the first reversing outlet, so that the refrigerating fluid flowing out of the outlet of the first heat exchanger flows into the battery cooler and the first heat exchanger.
8. The oil return temperature control method according to claim 7, wherein the controlling the opening degree of the reversing valve includes: Acquiring the air outlet temperature of the heat exchange system; And controlling the opening degree of the reversing valve according to the air outlet temperature.
9. The oil return temperature control method according to claim 8, wherein the controlling the opening degree of the reversing valve according to the outlet air temperature includes: Controlling the opening degree of the reversing valve according to the change rate of the outlet air temperature of the heat exchange system, wherein the larger the change rate is, the larger the opening degree of the reversing valve is, and/or And controlling the opening degree of the reversing valve according to the difference value between the air outlet temperature of the heat exchange system and the target temperature of the heat exchange system, wherein the larger the absolute value of the difference value is, the larger the opening degree of the reversing valve is.
10. The oil return temperature control method according to claim 7, wherein the controlling the opening degree of the reversing valve includes: acquiring the temperature of the frozen oil; and controlling the opening degree of the reversing valve according to the temperature of the frozen oil, wherein the opening degree of the reversing valve is larger as the temperature of the frozen oil is lower.
11. The oil return temperature control method according to claim 7, further comprising: acquiring the flow rate of the refrigerant oil flowing through the regulating valve; controlling the oil return rotating speed of the compressor according to the flow quantity of the frozen oil, wherein the larger the flow quantity is, the faster the oil return rotating speed is; The controlling the opening degree of the reversing valve comprises the following steps: and controlling the opening degree of the reversing valve according to the oil return rotating speed, wherein the opening degree of the reversing valve is larger as the oil return rotating speed is higher.
12. A readable storage medium, characterized in that a program is stored thereon, which program, when executed by a processor, implements the oil return temperature control method according to any one of claims 6 to 11.
13. A controller comprising one or more processors configured to perform the oil return temperature control method of any one of claims 6-11.

Description

Heat exchange system, oil return temperature control method, readable storage medium and controller Technical Field The application relates to the technical field of heat exchanger oil return, in particular to a heat exchange system, an oil return temperature control method, a readable storage medium and a controller. Background At present, in a small-load refrigeration mode of an electric automobile air conditioner, the rotation speed of a compressor is low due to small system load, so that the circulation amount of a refrigerant of the whole heat exchange system is small, meanwhile, the refrigerant of the compressor returns to the compressor through the circulation operation of the refrigerant of the system, the refrigerant can be gradually evaporated into a gaseous refrigerant, the refrigerant cannot be evaporated and gasified, and the refrigerant is gradually detained in a pipeline, so that the oil return of the refrigerant of the heat exchange system is difficult in the small-load refrigeration mode. Disclosure of Invention The application provides a heat exchange system, an oil return temperature control method, a readable storage medium and a controller, which are used for solving at least part of problems in the related art. The application provides a heat exchange system, comprising: A compressor, a first heat exchanger and a second heat exchanger connected in series, the second heat exchanger being connected between an outlet of the first heat exchanger and an inlet of the compressor; a battery cooler and a regulating valve connected in series between an outlet of the first heat exchanger and an inlet of the compressor; a reversing valve comprising a reversing inlet, a first reversing outlet and a second reversing outlet, wherein the reversing inlet is connected with the outlet of the first heat exchanger, the first reversing outlet is connected with the inlet of the first heat exchanger, the second reversing outlet is connected with the inlet of the battery cooler, and the outlet of the battery cooler is connected with the inlet of the first heat exchanger, and And the controller is connected with the compressor, the regulating valve and the reversing valve. Further, the heat exchange system further comprises a warm air water pump connected between the outlet of the first heat exchanger and the reversing inlet and used for pumping the frozen liquid of the first heat exchanger into the reversing valve. Further, the heat exchange system further comprises a water pump connecting the second reversing outlet of the reversing valve and the inlet of the battery cooler for pumping the chilled liquid from the second reversing outlet of the reversing valve to the battery cooler. Further, the heat exchange system further comprises a gas-liquid separator, wherein an inlet of the gas-liquid separator is connected with an outlet of the second heat exchanger and an outlet of the battery cooler, and an outlet of the gas-liquid separator is connected with an inlet of the compressor. Further, the heat exchange system also comprises a throttle valve connected in series with the second heat exchanger. Further, the first heat exchanger is a condenser, and the second heat exchanger is an evaporator. Further, the heat exchange system comprises a temperature sensor, wherein the temperature sensor is electrically connected with the controller and used for detecting the air outlet temperature of the heat exchange system. Further, the heat exchange system also comprises a temperature monitor electrically connected with the controller for detecting the temperature of the refrigerant oil flowing through the regulating valve. Further, the heat exchange system also comprises a flow detector electrically connected with the controller for detecting the flow rate of the refrigerating oil flowing through the regulating valve. The application provides an oil return temperature control method of a heat exchange system, which comprises a compressor, a first heat exchanger, a second heat exchanger, a battery cooler, a regulating valve and a reversing valve, wherein the compressor, the first heat exchanger and the second heat exchanger are connected in series; the reversing valve comprises a reversing inlet, a first reversing outlet and a second reversing outlet, wherein the reversing inlet is connected with the outlet of the first heat exchanger, the first reversing outlet is connected with the inlet of the first heat exchanger, the second reversing outlet is connected with the inlet of the battery cooler, and the outlet of the battery cooler is connected with the inlet of the first heat exchanger; The oil return temperature control method comprises the following steps: acquiring working state information of a compressor, wherein the working state information of the compressor comprises an operation rotating speed and an operation time length, and In the refrigeration mode, if the running rotating speed is lower than a set rotating sp