Heat exchange system, oil return temperature control method, readable storage medium and controller

Abstract

The application provides a heat exchange system, an oil return temperature control method, a readable storage medium and a controller. The heat exchange system comprises a compressor, a first heat exchanger and a second heat exchanger 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 connected with the battery cooler and the first heat exchanger and the controller. The controller acquires the working state information of the compressor, and in the refrigeration mode, if the running speed of the compressor is lower than the set speed and the running time reaches the first time length, the regulating valve is controlled to be opened, and the compressor is controlled to run at the oil return speed, so that the refrigeration oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve, the flow rate of the refrigeration oil in the heat exchange system is increased, the reversing inlet of the reversing valve is controlled to be communicated with at least the second reversing outlet when the flow rate of the refrigeration oil in the heat exchange system is increased, so that the heat load in the refrigeration liquid flows into the battery cooler, and the sudden drop of the air outlet temperature is prevented.

Description

Technical Field

[0001] This application relates to the field of heat exchanger oil return technology, and in particular to a heat exchange system, an oil return temperature control method, a readable storage medium, and a controller. Background Technology

[0002] Currently, in the low-load cooling mode of electric vehicle air conditioners, due to the small system load and low compressor speed, the amount of refrigerant circulating in the entire heat exchange system is small. At the same time, the compressor's refrigerant oil returns to the compressor through the circulation of the system's refrigerant. The refrigerant can gradually evaporate into gaseous refrigerant, but the refrigerant oil will not evaporate and vaporize, causing the refrigerant oil to gradually remain in the pipes. Therefore, it is relatively difficult for the refrigerant oil to return to the heat exchange system in the low-load cooling mode. Summary of the Invention

[0003] This application provides a heat exchange system, an oil return temperature control method, a readable storage medium, and a controller to solve at least some of the problems in the related art.

[0004] This application provides a heat exchange system, including:

[0005] A compressor, a first heat exchanger, and a second heat exchanger are connected in series, with the second heat exchanger connected between the outlet of the first heat exchanger and the inlet of the compressor;

[0006] A battery cooler and a regulating valve, wherein the battery cooler and the regulating valve are connected in series between the outlet of the first heat exchanger and the inlet of the compressor;

[0007] A reversing valve includes a reversing inlet, a first reversing outlet, and a second reversing outlet. The reversing inlet is connected to the outlet of a first heat exchanger, the first reversing outlet is connected to the inlet of the first heat exchanger, and the second reversing outlet is connected to the inlet of a battery cooler, with the outlet of the battery cooler connected to the inlet of the first heat exchanger.

[0008] The controller is connected to the compressor, the regulating valve, and the reversing valve.

[0009] Furthermore, the heat exchange system also includes a warm air pump connected between the outlet of the first heat exchanger and the reversing inlet, for pumping the refrigerant from the first heat exchanger into the reversing valve.

[0010] Furthermore, the heat exchange system also includes a water pump connected to the second reversing outlet of the reversing valve and the inlet of the battery cooler, for pumping coolant from the second reversing outlet of the reversing valve into the battery cooler.

[0011] Furthermore, the heat exchange system also includes a gas-liquid separator, the inlet of which is connected to the outlet of the second heat exchanger and the outlet of the battery cooler, and the outlet of which is connected to the inlet of the compressor.

[0012] Furthermore, the heat exchange system also includes a throttling valve, which is connected in series with the second heat exchanger.

[0013] Furthermore, the first heat exchanger is a condenser, and the second heat exchanger is an evaporator.

[0014] Furthermore, the heat exchange system includes a temperature sensor electrically connected to the controller for detecting the outlet air temperature of the heat exchange system.

[0015] Furthermore, the heat exchange system also includes a temperature monitor electrically connected to the controller for detecting the temperature of the refrigeration oil flowing through the regulating valve.

[0016] Furthermore, the heat exchange system also includes a flow detector electrically connected to the controller for detecting the flow rate of the refrigeration oil passing through the regulating valve.

[0017] This application provides a method for controlling the return oil temperature of a heat exchange system. The heat exchange system includes: a compressor, a first heat exchanger, and a second heat exchanger connected in series, as well as a battery cooler, a regulating valve, and a reversing valve. The second heat exchanger is connected between the outlet of the first heat exchanger and the inlet of the compressor. The battery cooler and the regulating valve are connected in series between the first heat exchanger and the gas-liquid separator. The reversing valve includes a reversing inlet, a first reversing outlet, and a second reversing outlet. The reversing inlet is connected to the outlet of the first heat exchanger, the first reversing outlet is connected to the inlet of the first heat exchanger, the second reversing outlet is connected to the inlet of the battery cooler, and the outlet of the battery cooler is connected to the inlet of the first heat exchanger.

[0018] The oil return temperature control method includes:

[0019] Obtain the compressor's operating status information, including operating speed and operating time; and

[0020] In cooling mode, if the operating speed is lower than the set speed and the running time reaches a first duration, the regulating valve is opened, and the compressor is controlled to run at an oil return speed higher than the set speed, so that the refrigerant oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve. The reversing inlet of the reversing valve is controlled to be connected to at least the second reversing outlet, so that at least a portion of the refrigerant flowing out of the outlet of the first heat exchanger flows into the battery cooler through the reversing valve.

[0021] Further, the reversing inlet of the control valve is at least connected to the second reversing outlet, including:

[0022] In cooling mode, if the operating speed is lower than the set speed and the operating time reaches the first duration, the opening degree of the reversing valve is controlled, and the opening degree is greater than zero and less than or equal to 100%.

[0023] When the opening of the reversing valve is zero, the reversing inlet is connected to the first reversing outlet and cut off from the second reversing outlet, so that the refrigerant flowing out of the outlet of the first heat exchanger flows into the first heat exchanger.

[0024] When the opening degree of the reversing valve is 100%, the reversing inlet is connected to the second reversing outlet and cut off from the first reversing outlet, so that the coolant flowing out of the outlet of the first heat exchanger flows into the battery cooler.

[0025] When the opening degree of the reversing valve is greater than zero and less than 100%, the reversing inlet of the reversing valve is connected to the second reversing outlet and to the first reversing outlet, so that the coolant flowing out of the outlet of the first heat exchanger flows into the battery cooler and the first heat exchanger.

[0026] Furthermore, controlling the opening degree of the reversing valve includes:

[0027] Obtain the outlet air temperature of the heat exchange system;

[0028] The opening degree of the reversing valve is controlled according to the outlet air temperature.

[0029] Furthermore, controlling the opening degree of the reversing valve based on the outlet air temperature includes:

[0030] The opening degree of the reversing valve is controlled according to the rate of change of the outlet air temperature of the heat exchange system; the greater the rate of change, the greater the opening degree of the reversing valve.

[0031] Furthermore, the opening degree of the reversing valve is controlled based on the difference between the outlet air temperature of the heat exchange system and the target temperature of the heat exchange system. The larger the absolute value of the difference, the larger the opening degree of the reversing valve.

[0032] Furthermore, controlling the opening degree of the reversing valve includes:

[0033] Obtain the temperature of the refrigeration oil;

[0034] The opening degree of the reversing valve is controlled according to the temperature of the refrigeration oil; the lower the temperature of the refrigeration oil, the larger the opening degree of the reversing valve.

[0035] Furthermore, the oil return temperature control method also includes:

[0036] Obtain the flow rate of the refrigeration oil flowing through the regulating valve;

[0037] The oil return speed of the compressor is controlled according to the flow rate of the refrigeration oil; the greater the flow rate, the faster the oil return speed.

[0038] The control of the opening degree of the reversing valve includes:

[0039] The opening of the directional valve is controlled according to the oil return speed; the faster the oil return speed, the larger the opening of the directional valve.

[0040] This application provides a readable storage medium storing a program thereon, which, when executed by a processor, implements the above-described oil return temperature control method.

[0041] This application provides a controller, including one or more processors, for performing the above-described oil return temperature control method.

[0042] The heat exchange system provided in this application includes a compressor, a first heat exchanger, and a second heat exchanger 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 a regulating valve and a controller connected to the battery cooler and the first heat exchanger. The controller acquires the compressor's operating status information, and in cooling mode, if the compressor's operating speed is lower than a set speed and the operating time reaches a first duration, it controls the regulating valve to open and controls the compressor to operate at an oil return speed. This allows the refrigerant oil flowing from the outlet of the first heat exchanger to flow through the regulating valve into the gas-liquid separator, thereby increasing the flow rate of the refrigerant oil within the heat exchange system, promoting the return of the refrigerant oil, and improving the oil return rate. The controller controls the reversing valve to connect at least the second reversing outlet when the flow rate of the refrigerant oil in the heat exchange system is increased. This allows at least a portion of the refrigerant flowing out of the outlet of the first heat exchanger to flow into the battery cooler through the reversing valve. The refrigerant flowing out of the outlet of the first heat exchanger carries a large heat load. The refrigerant flowing into the battery cooler through the reversing valve allows the heat load in the refrigerant to flow into the battery cooler. This prevents a sudden drop in the temperature of the heat exchange system caused by the increase in compressor speed during the refrigerant oil return process, reduces the impact of oil return on the heat exchange effect, and helps improve user comfort.

[0043] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0044] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0045] Figure 1 The diagram shown is a schematic representation of an exemplary embodiment of the heat exchange system of this application.

[0046] Figure 2 The diagram shown is a structural schematic of another exemplary embodiment of the heat exchange system of this application;

[0047] Figure 3 The diagram shown is a structural schematic of yet another exemplary embodiment of the heat exchange system of this application;

[0048] Figure 4 The diagram shown is a flowchart of an exemplary embodiment of the oil return temperature control method of this application;

[0049] Figure 5 The diagram shown is a flowchart of another exemplary embodiment of the oil return temperature control method of this application;

[0050] Figure 6 The diagram shown is a flowchart of yet another exemplary embodiment of the oil return temperature control method of this application;

[0051] Figure 7 The diagram shown is a flowchart of yet another exemplary embodiment of the oil return temperature control method of this application;

[0052] Figure 8 The diagram shown is a block diagram of a controller provided in one embodiment of this application. Detailed Implementation

[0053] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0054] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. Unless otherwise defined, the technical or scientific terms used in this application should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality" or "several" indicates two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and / or "upper," etc., are for ease of description only and are not limited to a location or spatial orientation. The terms "comprising" or "including," etc., mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. The terms "connected," "linked," etc., are not limited to physical or mechanical connections and can include electrical connections, whether direct or indirect.

[0055] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0056] This application provides a heat exchange system, an oil return temperature control method, a readable storage medium, and a controller. The heat exchange system, oil return temperature control method, readable storage medium, and controller of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0057] Figure 1 The diagram shown is a schematic representation of an exemplary embodiment of the heat exchange system of this application. Figure 1 As shown, the heat exchange system 201 provided in this application includes a compressor 202, a first heat exchanger 203, and a second heat exchanger 204 connected in series. The second heat exchanger 204 is connected between the outlet of the first heat exchanger 203 and the inlet of the compressor 202. The series connection of the compressor 202, the first heat exchanger 203, and the second heat exchanger 204 is beneficial for realizing the heat exchange function of the heat exchange system 201.

[0058] The heat exchange system 201 also includes a battery cooler 205, a regulating valve 206, a reversing valve 207, and a controller 211. The battery cooler 205 and the regulating valve 206 are connected in series between the outlet of the first heat exchanger 203 and the inlet of the compressor 202. The regulating valve 206 can be used to regulate the flow rate of the liquid flowing through the pipeline. Specifically, the regulating valve 206 can be located near the outlet of the first heat exchanger 203 or near the inlet of the compressor 202 to regulate the flow rate. The battery cooler 205 can transfer heat to the outside through heat dissipation, allowing the battery to operate normally and contributing to the normal operation of the heat exchange system 201.

[0059] Figure 2 The diagram shown is a structural schematic of another exemplary embodiment of the heat exchange system of this application. Figure 2 As shown, the reversing valve 207 includes a reversing inlet 208, a first reversing outlet 209, and a second reversing outlet 210. The reversing inlet 208 is connected to the outlet of the first heat exchanger 203, the first reversing outlet 209 is connected to the inlet of the first heat exchanger 203, and the second reversing outlet 210 is connected to the inlet of the battery cooler 205. The outlet of the battery cooler 205 is also connected to the inlet of the first heat exchanger 203. By connecting to the inlet and outlet of the first heat exchanger 203 and the inlet of the battery cooler 205, the reversing valve 207 facilitates the flow of liquid among these three components, thereby enabling communication between the first heat exchanger 203 and the battery cooler 205.

[0060] Controller 211 is connected to compressor 202, regulating valve 206, and reversing valve 207, and is used to control compressor 202, regulating valve 206, and reversing valve 207. Specifically, the control is as follows:

[0061] The operating status information of compressor 202 is obtained, including its operating speed and operating time. Obtaining the operating speed of compressor 202 can characterize its operating power. Under different ambient temperature conditions, the operating power of compressor 202 varies, and different operating power levels help achieve a relative balance between heat exchange efficiency and energy saving / emission reduction in heat exchange system 201. Obtaining the operating time of compressor 202 characterizes its operating time at a specific operating speed, which is helpful for monitoring the overall operating status of compressor 202.

[0062] Figure 3 The diagram shown is a structural schematic of yet another exemplary embodiment of the heat exchange system of this application. Figure 3As shown, the controller 211 is also used in refrigeration mode to control the regulating valve 206 to open if the operating speed is lower than the set speed and the operating time reaches a first duration, thereby controlling the compressor 202 to operate at an oil return speed higher than the set speed, so that the refrigerant oil flowing out of the outlet of the first heat exchanger 203 flows into the compressor 202 through the regulating valve 206. Figure 2-3 As shown, the reversing inlet 208 of the reversing valve 207 is connected to at least the second reversing outlet 210, so that at least a portion of the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the battery cooler 205 through the reversing valve 207. The compressor 202 operating speed being lower than the set speed indicates that the compressor 202 is currently operating under low load, the ambient temperature is relatively low, and there is no need for the compressor 202 to operate at high power to improve the cooling effect. Due to the low operating speed of the compressor 202, the coolant in the heat exchange system 201 also flows relatively slowly, and the refrigerant oil correspondingly stagnates inside the pipes connected in series with the compressor 202. The controller 211 opens the regulating valve 206 by controlling it, which helps to increase the flow path of the refrigerant oil from the first heat exchanger 203 back to the compressor 202. Furthermore, the opening degree of the regulating valve 206 is adjustable, which helps to increase the flow speed of the refrigerant oil in the pipe where the regulating valve 206 is located, and thus helps to increase the oil return rate of the refrigerant oil. By controlling the compressor 202 to operate at the oil return speed, the refrigeration oil flows back to the compressor 202 under the drive of the high-power speed, which helps to increase the flow rate of the refrigeration oil back to the compressor 202.

[0063] Because the compressor 202 operates at a return oil speed higher than the set speed during oil return, the compressor 202 increases its power in cooling mode, resulting in a significant increase in cooling effect. This can easily lead to a sudden drop in the outlet air temperature. When the ambient temperature is already relatively low, this sudden temperature drop can cause discomfort for users. Therefore, the controller 211 controls the reversing inlet 208 of the reversing valve 207 to be connected to at least the second reversing outlet 210, so that part of the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the battery cooler 205. This helps to transfer part of the heat load of the first heat exchanger 203 to the battery cooler 205 through the refrigerant. By increasing the heat load of the battery cooler 205, the sudden drop in outlet air temperature caused by the increase in the speed of the compressor 202 is compensated for, which helps to maintain the stability of the outlet air temperature and improve the user experience.

[0064] In some embodiments, the heat exchange system 201 further includes a heater pump 213, a water pump 212, a gas-liquid separator 215, and a throttle valve 214. The heater pump 213 is connected between the outlet of the first heat exchanger 203 and the reversing inlet 208, and is used to pump the refrigerant from the first heat exchanger 203 into the reversing valve 207. By providing the heater pump 213, the refrigerant flowing out of the outlet of the first heat exchanger 203 is powered, promoting the flow of refrigerant towards the reversing valve 207. The water pump 212 is connected between the second reversing outlet 210 of the reversing valve 207 and the inlet of the battery cooler 205, and is used to pump the refrigerant from the second reversing outlet 210 of the reversing valve 207 into the battery cooler 205. By providing the water pump 212, the refrigerant flowing out of the second reversing outlet 210 of the reversing valve 207 is powered, which helps to increase the rate at which the refrigerant flows from the reversing valve 207 to the battery cooler 205. The inlet of the gas-liquid separator 215 is connected to the outlet of the second heat exchanger 204 and the outlet of the battery cooler 205, and the outlet of the gas-liquid separator 215 is connected to the inlet of the compressor 202. The gas-liquid separator 215 is used to separate gas from the refrigeration oil, which helps to improve the purity of the refrigeration oil, reduce the volume occupied by the refrigeration oil, and increase the return rate of the refrigeration oil to the compressor 202. The throttle valve 214 is connected in series with the second heat exchanger 204. The throttle valve 214 is used to regulate the flow rate of the refrigeration oil between the first heat exchanger 203 and the second heat exchanger 204.

[0065] In some embodiments, the first heat exchanger 203 is a condenser and the second heat exchanger 204 is an evaporator.

[0066] In some embodiments, the controller 211 is configured to, in cooling mode, control the opening degree of the reversing valve 207 if the operating speed is lower than a set speed and the operating time reaches a first duration, wherein the opening degree is greater than zero and less than or equal to 100%. The operating speed being lower than the set speed indicates that the compressor 202 is operating at a low load power, and when the compressor 202 has been running for the first duration (specifically, the first duration can be set to 1 hour), the controller controls the opening degree of the reversing valve 207 to be greater than zero to allow refrigerant to flow through the reversing valve 207.

[0067] When the opening of the reversing valve 207 is zero, the reversing inlet 208 is connected to the first reversing outlet 209 and cut off from the second reversing outlet 210, so that all the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the first heat exchanger 203. When the opening of the reversing valve 207 is zero, the second reversing outlet 210 is cut off, and all the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the first heat exchanger 203, realizing the self-circulation of the refrigerant oil in the first heat exchanger 203.

[0068] When the reversing valve 207 is 100% open, the reversing inlet 208 is connected to the second reversing outlet 210 and closed to the first reversing outlet 209, so that the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the battery cooler 205. When the reversing valve 207 is 100% open, the first reversing outlet 209 is closed, and the reversing inlet 208 is connected to the second reversing outlet 210. The refrigerant of the first heat exchanger 203 flows out from the outlet of the first heat exchanger 203 and flows into the reversing valve 207 through the reversing inlet 208, and then flows entirely to the battery cooler 205 through the second reversing outlet 210, so as to transfer the heat of the refrigerant to the battery cooler 205. This helps to compensate for the sudden drop in outlet air temperature caused by the increase in compressor speed when the compressor speed 202 increases, thus improving the user experience.

[0069] When the opening degree of the reversing valve 207 is greater than zero and less than 100%, the reversing inlet 208 of the reversing valve 207 is connected to the second reversing outlet 210 and the first reversing outlet 209, so that the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the battery cooler 205 and the first heat exchanger 203. Compared with the reversing valve 207 being 100% open, the reversing valve 207 flows simultaneously with the first reversing outlet 209 and the second reversing outlet 210, so that the refrigerant flows into the battery cooler 205 and the first heat exchanger 203 at the same time. Therefore, the heat load on the battery cooler 205 is relatively small, and the temperature difference compensation is also relatively small.

[0070] In some embodiments, the heat exchange system 201 includes a temperature sensor electrically connected to a controller 211 for detecting the outlet air temperature of the heat exchange system 201. The temperature sensor can be placed at the outlet of the heat exchange system 201 or at a location close to the heat exchange system 201 in the environment, which helps to improve the accuracy of the outlet air temperature measured by the temperature sensor.

[0071] In some embodiments, the controller 211 is configured to, in cooling mode, if the operating speed is lower than the set speed and the operating time reaches a first duration, control the opening degree of the reversing valve 207 according to the outlet air temperature of the heat exchange system 201. Different outlet air temperatures represent different cooling states of the heat exchange system 201, and controlling the opening degree of the reversing valve 207 according to different outlet air temperatures can adjust the outlet air temperature as needed.

[0072] In some embodiments, the controller 211 is configured to, in cooling mode, if the operating speed is lower than the set speed and the operating time reaches a first duration, control the opening of the reversing valve 207 according to the rate of change of the outlet air temperature of the heat exchange system 201. The greater the rate of change, the larger the opening of the reversing valve 207. The rate of change of the outlet air temperature of the heat exchange system 201 can be used to characterize the degree of sudden drop in outlet air temperature when the compressor 202 increases its speed for oil return. The greater the rate of change, the greater the sudden drop in outlet air temperature, resulting in stronger discomfort. At this time, more heat load needs to be added to the battery cooler 205, therefore, it is necessary to control the opening of the reversing valve 207 to be larger.

[0073] The controller 211 can also be used in cooling mode to control the opening of the reversing valve 207 based on the difference between the outlet air temperature and the target temperature of the heat exchange system 201 when the operating speed is lower than the set speed and the running time reaches the first duration. The larger the absolute value of the difference, the larger the opening of the reversing valve 207. When the compressor 202 operates below the set speed and the running time reaches the first duration, it indicates that the cooling effect of the heat exchange system 201 has initially reached the user's set temperature. At this time, if the compressor 202 increases its speed to return oil, the cooling effect is easily affected by the increase in the speed of the compressor 202, which in turn leads to a larger difference between the outlet air temperature and the user's set temperature. Under this situation, the greater the impact on the cooling effect, the larger the absolute value of the difference between the outlet air temperature and the target temperature of the heat exchange system 201. At this time, it is necessary to increase the opening of the reversing valve 207 to increase the heat load of the battery cooler 205, thereby compensating for more temperature and increasing the outlet air temperature, thus improving the user experience.

[0074] In some embodiments, the heat exchange system 201 further includes a temperature monitor electrically connected to a controller 211 for detecting the temperature of the refrigeration oil flowing through the regulating valve 206. The temperature detector can be installed on the regulating valve 206 or in the return line near the installation location of the regulating valve 206, which helps to improve the accuracy of the refrigeration oil temperature detected by the temperature monitor.

[0075] The controller 211, in cooling mode, controls the opening of the reversing valve 207 based on the temperature of the refrigerant oil if the operating speed is lower than the set speed and the operating time reaches a certain duration. The lower the temperature of the refrigerant oil, the larger the opening of the reversing valve 207. During the refrigerant oil return process, the lower the temperature of the refrigerant oil, the lower the temperature in the circuit, and the better the cooling effect of the heat exchange system 201. However, when the cooling temperature is almost at the user's set temperature, the good cooling effect will lead to the temperature being lower than the user's set temperature, causing discomfort to the user. Therefore, it is necessary to control the opening of the reversing valve 207 to control and compensate for the outlet air temperature. The lower the temperature of the refrigerant oil, the greater the sudden drop in outlet air temperature, requiring an increase in the opening of the reversing valve 207 to compensate for more heat load.

[0076] In some embodiments, the heat exchange system 201 further includes a flow detector electrically connected to the controller 211 for detecting the flow rate of refrigeration oil through the regulating valve 206. The flow detector can be installed inside the regulating valve 206 or in a pipeline close to the regulating valve 206, which helps to improve the accuracy of flow detection.

[0077] The controller 211 controls the oil return speed of the compressor 202 according to the flow rate of the refrigeration oil. The greater the flow rate, the faster the oil return speed. The greater the flow rate of the refrigeration oil, the higher the oil return speed required by the compressor 202 to return the refrigeration oil.

[0078] The controller 211 is used in cooling mode to control the opening of the reversing valve 207 according to the oil return speed if the operating speed is lower than the set speed and the operating time reaches the first duration. Different oil return speeds indicate different flow rates of refrigeration oil and different cooling effects. The higher the oil return speed, the better the cooling effect and the greater the temperature drop. Increasing the opening of the reversing valve 207 by controlling it helps to better compensate for the sudden temperature drop.

[0079] In some embodiments, the controller 211 is configured to, in cooling mode, connect the reversing inlet 208 of the reversing valve 207 to the first reversing outlet 209 and disconnect it from the second reversing outlet 210 if the operating speed is not lower than the set speed and / or the operating time has not reached the first duration. When the compressor 202's operating speed and operating time do not meet the set conditions, the refrigerant oil does not return in large quantities, thus preventing a sudden drop in the outlet air temperature under comfortable conditions. Therefore, by connecting the reversing inlet 208 of the reversing valve 207 to the first reversing outlet 209 and disconnecting it from the second reversing outlet 210, the controller achieves self-circulation of the heat load of the first reversing valve 207, without affecting the normal heat dissipation of the battery cooler 205.

[0080] The controller 211 is also used in refrigeration mode to, after the compressor 202 has been running at the oil return speed for a second duration, control the regulating valve 206 to close, control the second reversing outlet 210 of the reversing valve 207 to close, control the compressor 202 to run at the operating speed, and reacquire the operating status information of the compressor 202. The second duration of the compressor 202 running at the oil return speed indicates that the compressor 202 has basically achieved oil return. At this time, the regulating valve 206 is closed, and the compressor 202 is controlled to run at the operating speed, reacquiring the operating status information to achieve real-time monitoring of the compressor 202's status.

[0081] Figure 4 The diagram shown is a flowchart of an exemplary embodiment of the oil return temperature control method of this application. Figure 4As shown, this application provides a method for controlling the temperature of the oil return in a heat exchange system 201, which is used in the aforementioned heat exchange system 201. The method for controlling the temperature of the oil return includes steps 21-22:

[0082] Step 21: Obtain the operating status information of compressor 202, including operating speed and operating time. Obtaining the operating speed of compressor 202 is used to determine whether compressor 202 is in a low-load operating state, and thus determine the flow status of refrigerant oil inside compressor 202.

[0083] Step 22: In cooling mode, if the operating speed is lower than the set speed and the operating time reaches the first duration, control valve 206 opens, controlling compressor 202 to operate at a return oil speed higher than the set speed. This allows refrigerant oil flowing from the outlet of the first heat exchanger 203 to flow into compressor 202 through control valve 206. Simultaneously, control the reversing inlet 208 of reversing valve 207 to connect at least with the second reversing outlet 210, allowing at least a portion of the refrigerant flowing from the outlet of the first heat exchanger 203 to flow into battery cooler 205 through reversing valve 207. After compressor 202 operates at a lower speed for a certain duration, control valve 206 opens, connecting the first heat exchanger 203 to compressor 202 through control valve 206. This shortens the refrigerant oil return path and controls compressor 202 to operate at a higher return oil speed, thereby increasing the flow rate of refrigerant oil and accelerating the return of refrigerant oil from the pipeline to compressor 202. When the compressor 202 increases its speed, the outlet air temperature drops sharply. Controlling the connection between the second reversing outlet 210 and the reversing inlet 208 of the reversing valve 207 helps to increase the heat load of the battery cooler 205 and compensate for the sudden temperature drop.

[0084] In some embodiments, in step 22, controlling the reversing inlet 208 of the reversing valve 207 to communicate at least with the second reversing outlet 210 includes:

[0085] In cooling mode, if the operating speed is lower than the set speed and the running time reaches the first duration, the opening degree of the reversing valve 207 is controlled. This opening degree is greater than zero and less than or equal to 100%.

[0086] When the opening of the reversing valve 207 is zero, the reversing inlet 208 is connected to the first reversing outlet 209 and cut off from the second reversing outlet 210, so that the refrigerant flowing out of the outlet of the first heat exchanger 203 flows into the first heat exchanger 203.

[0087] When the opening of the reversing valve 207 is 100%, the reversing inlet 208 is connected to the second reversing outlet 210 and cut off from the first reversing outlet 209, so that the coolant flowing out of the outlet of the first heat exchanger 203 flows into the battery cooler 205.

[0088] When the opening degree of the reversing valve 207 is greater than zero and less than 100%, the reversing inlet 208 of the reversing valve 207 is connected to the second reversing outlet 210 and to the first reversing outlet 209, so that the coolant flowing out of the outlet of the first heat exchanger 203 flows into the battery cooler 205 and the first heat exchanger 203.

[0089] Figure 5 The diagram shown is a flowchart of another exemplary embodiment of the oil return temperature control method of this application. Figure 5 In the illustrated embodiment, controlling the opening degree of the reversing valve 207 includes steps 31-32:

[0090] Step 31: Obtain the outlet air temperature of the heat exchange system 201. Obtaining the outlet air temperature determines the cooling status of the heat exchange system 201 at this time.

[0091] Step 32: Control the opening of the reversing valve 207 according to the outlet air temperature. The lower the outlet air temperature, the greater the temperature drop, and the more the opening of the reversing valve 207 needs to be increased to compensate for the greater heat load.

[0092] Step 32, based on the outlet air temperature, control the opening degree of the reversing valve 207, including:

[0093] The opening degree of the reversing valve 207 is controlled according to the rate of change of the outlet air temperature of the heat exchange system 201. The greater the rate of change, the larger the opening degree of the reversing valve 207. A larger rate of change of the outlet air temperature indicates a greater temperature drop, requiring an increase in the opening degree of the reversing valve 207 to provide more heat load.

[0094] Step 32, controlling the opening degree of the reversing valve 207 according to the outlet air temperature, also includes:

[0095] The opening degree of the reversing valve 207 is controlled based on the difference between the outlet air temperature and the target temperature of the heat exchange system 201. The larger the absolute value of the difference, the larger the opening degree of the reversing valve 207. A larger temperature difference indicates a greater temperature drop, requiring a larger opening degree of the reversing valve 207 to provide more heat load.

[0096] Figure 6 The diagram shown is a flowchart of yet another exemplary embodiment of the oil return temperature control method of this application. Figure 6 In the illustrated embodiment, controlling the opening degree of the reversing valve 207 includes steps 41-42:

[0097] Step 41: Obtain the temperature of the refrigeration oil. The temperature of the refrigeration oil can be obtained using the heat exchange system 201 described above, which will not be elaborated further here.

[0098] Step 42: Control the opening of the reversing valve 207 according to the temperature of the refrigeration oil; the lower the temperature of the refrigeration oil, the larger the opening of the reversing valve 207. The lower the temperature of the refrigeration oil, the greater the temperature drop of the heat exchange system 201. Adjust the reversing valve 207 to a larger opening to provide more heat load.

[0099] Figure 7 The diagram shown is a flowchart of yet another exemplary embodiment of the oil return temperature control method of this application. Figure 7 In the illustrated embodiment, the oil return control method of this application further includes steps 51-52:

[0100] Step 51: Obtain the flow rate of the refrigeration oil through the regulating valve 206. The flow rate of the refrigeration oil can be used to characterize the remaining amount of refrigeration oil that needs to be returned.

[0101] Step 52: Based on the flow rate of the refrigeration oil, control the oil return speed of compressor 202. The greater the flow rate, the faster the oil return speed. The greater the flow rate, the higher the speed of compressor 202 needs to return the refrigeration oil.

[0102] Controlling the opening degree of the directional valve 207 includes:

[0103] The opening of the reversing valve 207 is controlled according to the oil return speed; the faster the oil return speed, the larger the opening of the reversing valve 207. The faster the compressor 202 rotates, the greater the sudden drop in outlet air temperature, requiring more heat load to be provided.

[0104] In some embodiments, after controlling the compressor 202 to operate at the oil return speed, the oil return temperature control method further includes:

[0105] If the compressor 202 operates at the return oil speed for a certain period of time, the control regulating valve 206 closes, the second reversing outlet 210 of the control reversing valve 207 is cut off, the compressor 202 is controlled to operate at the operating speed, and the operating status information of the compressor 202 is reacquired. This is beneficial for real-time adjustment of the states of the reversing valve 207, the compressor 202, and the regulating valve 206.

[0106] Figure 8 The diagram shown is a block diagram of a controller provided in one embodiment of this application. 。 Figure 8The controller 211 shown includes one or more processors 100. The controller 211 is used to control the opening and closing of the regulating valve 206 during the oil return process of the heat exchange system 201, and to control the speed of the compressor 202, so that the refrigerant oil in the heat exchange system 201 flows back to the compressor 202 quickly and in large quantities. This is beneficial to improving the operating efficiency of the compressor 202, reducing the wear of the internal parts of the compressor 202, increasing the service life of the compressor 202 and the cooling effect of the heat exchange system 201, and controlling the flow direction of the reversing valve 207 to provide heat load to the battery cooler 205, so as to reduce the discomfort caused by the sudden drop in outlet air temperature during the oil return process.

[0107] In some embodiments, the controller 211 may include a readable storage medium 109, which may store a program that can be invoked by the processor 100, and may include a non-volatile storage medium. In some embodiments, the heat exchange controller 211 may include memory 108 and an interface 107. In some embodiments, the heat exchange controller 211 may also include other hardware depending on the specific application.

[0108] In some embodiments, this application provides a readable storage medium 109 on which a program is stored, which, when executed by a processor 100, implements the above-described oil return method.

[0109] This application may take the form of a computer program product implemented on one or more storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code. Readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information may be computer-readable instructions, data structures, program modules, or other data. Examples of readable storage media include, but are not limited to: phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device. Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed in this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0110] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0111] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A heat exchange system, characterized in that, include: A compressor, a first heat exchanger, and a second heat exchanger are connected in series, with the second heat exchanger connected between the outlet of the first heat exchanger and the inlet of the compressor; A battery cooler and a regulating valve, wherein the battery cooler and the regulating valve are connected in series between the outlet of the first heat exchanger and the inlet of the compressor; A reversing valve includes a reversing inlet, a first reversing outlet, and a second reversing outlet. The reversing inlet is connected to the outlet of a first heat exchanger, the first reversing outlet is connected to the inlet of the first heat exchanger, and the second reversing outlet is connected to the inlet of a battery cooler, with the outlet of the battery cooler connected to the inlet of the first heat exchanger. The controller is connected to the compressor, the regulating valve, and the reversing valve; The controller is used for: Obtain the compressor's operating status information, which includes operating speed and operating time; and In cooling mode, if the operating speed is lower than the set speed and the running time reaches a first duration, the regulating valve is opened, and the compressor is controlled to run at an oil return speed higher than the set speed, so that the refrigerant oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve. The reversing inlet of the reversing valve is controlled to be connected to at least the second reversing outlet, so that at least a portion of the refrigerant flowing out of the outlet of the first heat exchanger flows into the battery cooler through the reversing valve.

2. The heat exchange system according to claim 1, characterized in that, Also includes: A warm air pump is connected between the outlet of the first heat exchanger and the reversing inlet, and is used to pump the refrigerant from the first heat exchanger into the reversing valve; and / or A water pump, connected to the second reversing outlet of the reversing valve and the inlet of the battery cooler, is used to pump coolant from the second reversing outlet of the reversing valve into the battery cooler; and / or A gas-liquid separator, the inlet of which is connected to the outlet of the second heat exchanger and the outlet of the battery cooler, and the outlet of which is connected to the inlet of the compressor; and / or The heat exchange system further includes a throttling valve, which is 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 according to claim 1, characterized in that, The heat exchange system includes a temperature sensor electrically connected to the controller for detecting the outlet air temperature of the heat exchange system.

4. The heat exchange system according to claim 1, characterized in that, It also includes a temperature monitor, which is electrically connected to the controller and is used to detect the temperature of the refrigeration oil flowing through the regulating valve.

5. The heat exchange system according to claim 1, characterized in that, It also includes a flow detector, which is electrically connected to the controller and is used to detect the flow rate of refrigeration oil through the regulating valve.

6. A method for controlling the temperature of oil return in a heat exchange system, characterized in that, The heat exchange system includes: a compressor, a first heat exchanger, and a second heat exchanger connected in series, as well as a gas-liquid separator, a battery cooler, a regulating valve, and a reversing valve; the second heat exchanger is connected between the outlet of the first heat exchanger and the inlet of the compressor; the battery cooler and the regulating valve are connected in series between the first heat exchanger and the gas-liquid separator; the reversing valve includes a reversing inlet, a first reversing outlet, and a second reversing outlet, the reversing inlet being connected to the outlet of the first heat exchanger, the first reversing outlet being connected to the inlet of the first heat exchanger, the second reversing outlet being connected to the inlet of the battery cooler, and the outlet of the battery cooler being connected to the inlet of the first heat exchanger; The oil return temperature control method includes: Obtain the compressor's operating status information, including operating speed and operating time; and In cooling mode, if the operating speed is lower than the set speed and the running time reaches a first duration, the regulating valve is opened, and the compressor is controlled to run at an oil return speed higher than the set speed, so that the refrigerant oil flowing out of the outlet of the first heat exchanger flows into the compressor through the regulating valve. The reversing inlet of the reversing valve is controlled to be connected to at least the second reversing outlet, so that at least a portion of the refrigerant 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 according to claim 6, characterized in that, The control of the reversing valve's reversing inlet to be at least connected to the second reversing outlet includes: In cooling mode, if the operating speed is lower than the set speed and the operating time reaches the first duration, the opening degree of the reversing valve is controlled, and the opening degree is greater than zero and less than or equal to 100%. When the opening of the reversing valve is zero, the reversing inlet is connected to the first reversing outlet and cut off from the second reversing outlet, so that the refrigerant 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 100%, the reversing inlet is connected to the second reversing outlet and cut off from the first reversing outlet, so that the coolant flowing out of the outlet of the first heat exchanger flows into the battery cooler. When the opening degree of the reversing valve is greater than zero and less than 100%, the reversing inlet of the reversing valve is connected to the second reversing outlet and to the first reversing outlet, so that the coolant 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, characterized in that, The control of the opening degree of the reversing valve includes: Obtain the outlet air temperature of the heat exchange system; The opening degree of the reversing valve is controlled according to the outlet air temperature.

9. The oil return temperature control method according to claim 8, characterized in that, The step of controlling the opening degree of the reversing valve according to the outlet air temperature includes: The opening degree of the reversing valve is controlled according to the rate of change of the outlet air temperature of the heat exchange system; the greater the rate of change, the greater the opening degree of the reversing valve; and / or The opening degree of the reversing valve is controlled based on the difference between the outlet air temperature of the heat exchange system and the target temperature of the heat exchange system. The larger the absolute value of the difference, the larger the opening degree of the reversing valve.

10. The oil return temperature control method according to claim 7, characterized in that, The control of the opening degree of the reversing valve includes: Obtain the temperature of the refrigeration oil; The opening degree of the reversing valve is controlled according to the temperature of the refrigeration oil; the lower the temperature of the refrigeration oil, the larger the opening degree of the reversing valve.

11. The oil return temperature control method according to claim 7, characterized in that, Also includes: Obtain the flow rate of the refrigeration oil flowing through the regulating valve; The oil return speed of the compressor is controlled according to the flow rate of the refrigeration oil; the greater the flow rate, the faster the oil return speed. The control of the opening degree of the reversing valve includes: The opening of the directional valve is controlled according to the oil return speed; the faster the oil return speed, the larger the opening of the directional valve.

12. A readable storage medium, characterized in that, It stores a program that, when executed by a processor, implements the oil return temperature control method as described in any one of claims 6-11.

13. A controller, characterized in that, It includes one or more processors for performing the oil return temperature control method according to any one of claims 6-11.

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