Control method and device for heat exchange system, and heat exchange system

Abstract

The application relates to the technical field of heat exchange systems, and discloses a control method and device for a heat exchange system and the heat exchange system. The heat exchange system comprises a heat exchange circuit and a refrigerant adjusting branch, wherein the heat exchange circuit comprises a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger which are connected in sequence, the refrigerant adjusting branch is connected with the heat exchange circuit between the outdoor heat exchanger and the throttling device at a liquid storage end, and the refrigerant adjusting branch is connected with a back gas port of the compressor at a liquid discharge end; the control method comprises the following steps: acquiring a compressor discharge port pressure and an operation mode of the heat exchange system; and adjusting a refrigerant storage capacity of the refrigerant adjusting branch according to the compressor discharge port pressure and the operation mode of the heat exchange system. The embodiment can adjust the refrigerant storage capacity of the refrigerant adjusting branch, that is, the refrigerant amount participating in the heat exchange cycle in the heat exchange circuit can be adjusted, so that the rationality of refrigerant charging of the heat exchange system under different working conditions is improved, and the performance of the heat exchange system is improved.

Description

Technical Field

[0001] This application relates to the field of heat exchange system technology, such as a control method and apparatus for a heat exchange system, and a heat exchange system. Background Technology

[0002] In an air conditioning system, refrigerant circulates within the system to achieve cooling or heating operation. The optimal refrigerant circulation volume required by the heat exchange system varies depending on the load of the air conditioner in cooling or heating mode. However, the refrigerant charge is fixed for the heat exchange system. When the outside temperature is high during cooling or low during heating, the rated refrigerant volume may cause the air conditioning system to operate under overload, resulting in poor cooling or heating performance. Conversely, when the outside temperature is low during cooling or high during heating, the air conditioning system operates at low load, and the refrigerant volume may be excessive. This excess refrigerant does not play a role in heat exchange during system operation, leading to low operating efficiency of the temperature control unit and preventing the heat exchange system from achieving its optimal performance, resulting in poor heat exchange effect.

[0003] In related technologies, the refrigerant in the heat exchange system is generally regulated by adjusting the opening of the throttle valve. This involves depressurizing, cooling, or pressurizing and heating the refrigerant to ensure that its condition meets the needs of the indoor heat exchanger and that the heat exchange system is in a relatively optimal state.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] Because the throttle has limited opening adjustment capability and a small adjustment range, when the refrigerant required by the heat exchange system varies greatly, the throttle cannot meet the refrigerant adjustment requirements, resulting in poor performance of the heat exchange system.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a control method and apparatus for a heat exchange system, and a heat exchange system, to improve the performance of the heat exchange system.

[0009] According to an embodiment of the first aspect of this application, a control method for a heat exchange system is provided. The heat exchange system includes a heat exchange loop and a refrigerant regulating branch. The heat exchange loop includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence. The liquid storage end of the refrigerant regulating branch is connected to the heat exchange loop located between the outdoor heat exchanger and the throttle valve. The liquid discharge end of the refrigerant regulating branch is connected to the compressor's return port. The control method includes: acquiring the compressor discharge port pressure and the operating mode of the heat exchange system; and adjusting the refrigerant storage in the refrigerant regulating branch according to the compressor discharge port pressure and the operating mode of the heat exchange system.

[0010] In some alternative embodiments, the refrigerant storage in the refrigerant regulating branch is adjusted according to the compressor discharge port pressure and the operating mode of the heat exchange system, including:

[0011] When the compressor discharge port pressure is less than or equal to the preset pressure and the heat exchange system is in heating mode, adjust the refrigerant storage in the refrigerant regulating branch to the first preset refrigerant amount.

[0012] When the compressor discharge port pressure is greater than the preset pressure and the heat exchange system is in heating mode, the refrigerant storage in the refrigerant regulating branch is adjusted to the second preset refrigerant amount; wherein, the first preset refrigerant amount is greater than the second preset refrigerant amount.

[0013] In some optional embodiments, when the compressor discharge port pressure is less than or equal to the preset pressure and the heat exchange system is in refrigeration mode, the refrigerant storage in the refrigerant regulation branch is adjusted to the third preset refrigerant amount.

[0014] When the compressor discharge port pressure is greater than the preset pressure and the heat exchange system is in cooling mode, adjust the refrigerant storage in the refrigerant regulating branch to the fourth preset refrigerant amount.

[0015] The third preset refrigerant quantity is greater than the fourth preset refrigerant quantity.

[0016] In some optional embodiments, the refrigerant regulating branch includes a liquid storage solenoid valve, a liquid storage device, and a liquid discharge solenoid valve connected in sequence. The liquid storage solenoid valve is located at the liquid storage end of the refrigerant regulating branch and is connected to the liquid storage port of the liquid storage device. The liquid discharge solenoid valve is located at the liquid discharge end of the refrigerant regulating branch and is connected to the liquid discharge port of the liquid storage device. Regulating the refrigerant storage amount in the refrigerant regulating branch to a third preset refrigerant amount includes: controlling the throttle to a throttling state, controlling the liquid storage solenoid valve to open to a third opening degree, and controlling the liquid discharge solenoid valve to open to a fourth opening degree; wherein the third opening degree is greater than the fourth opening degree; and / or,

[0017] Adjusting the refrigerant storage in the refrigerant regulating branch to the fourth preset refrigerant amount includes: controlling the throttle to the working throttle state, controlling the liquid storage solenoid valve to close, and controlling the liquid discharge solenoid valve to open.

[0018] In some optional embodiments, the refrigerant regulating branch includes a liquid storage solenoid valve, a liquid storage device, and a liquid discharge solenoid valve connected in sequence. The liquid storage solenoid valve is located at the liquid storage end of the refrigerant regulating branch and is connected to the liquid storage port of the liquid storage device. The liquid discharge solenoid valve is located at the liquid discharge end of the refrigerant regulating branch and is connected to the liquid discharge port of the liquid storage device. Regulating the refrigerant storage in the refrigerant regulating branch includes: after controlling the expansion valve to be in a fully open, non-throttling first throttling state, determining the refrigerant temperature difference between a first refrigerant temperature and a second refrigerant temperature; wherein the first refrigerant temperature is the temperature of the refrigerant flowing through the expansion valve, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the expansion valve; and controlling the operating state of the liquid storage solenoid valve and the liquid discharge solenoid valve according to the refrigerant temperature difference.

[0019] In some optional embodiments, controlling the operating state of the liquid storage solenoid valve and the liquid discharge solenoid valve according to the refrigerant temperature difference includes: when the refrigerant temperature difference is less than or equal to a preset temperature difference, controlling the liquid storage solenoid valve to open to a first opening degree and maintain it for a first preset duration, and controlling the liquid discharge solenoid valve to open to a second opening degree and maintain it for a second preset duration; wherein the first opening degree is greater than the second opening degree, and the first preset duration is greater than or equal to the second preset duration.

[0020] In some optional embodiments, controlling the operating state of the liquid receiving solenoid valve and the liquid discharging solenoid valve according to the refrigerant temperature difference includes: when the refrigerant temperature difference is less than or equal to a preset temperature difference, obtaining a first opening adjustment value of the liquid receiving solenoid valve corresponding to the refrigerant temperature difference, and a second opening adjustment value of the liquid discharging solenoid valve corresponding to the refrigerant temperature difference; adjusting the opening of the liquid receiving solenoid valve according to the first opening adjustment value based on the current opening value of the liquid receiving solenoid valve; and adjusting the opening of the liquid discharging solenoid valve according to the second opening adjustment value based on the current opening value of the liquid discharging solenoid valve.

[0021] In some alternative embodiments, the first opening adjustment value is positively correlated with the refrigerant temperature difference.

[0022] In some alternative embodiments, the second opening adjustment value is positively correlated with the refrigerant temperature difference.

[0023] In some optional embodiments, adjusting the refrigerant storage in the refrigerant regulating branch further includes: starting the timing when the liquid storage solenoid valve is opened, controlling the throttle to maintain the first throttling state for a third preset time, and then controlling the throttle to be in the second throttling state of working throttling; wherein the third preset time is less than or equal to the first preset time.

[0024] In some optional embodiments, adjusting the refrigerant storage in the refrigerant regulating branch further includes: obtaining the refrigerant quantity in the liquid storage device; when the refrigerant quantity in the liquid storage device is less than a first preset refrigerant quantity, controlling the throttle to be in a second throttling state of working throttling; and controlling the throttle to maintain the second throttling state for a fourth preset duration, and then controlling the throttle to be in a first throttling state of fully open and no throttling.

[0025] In some optional embodiments, adjusting the refrigerant storage in the refrigerant regulating branch further includes: when the refrigerant quantity in the liquid storage device is greater than or equal to the first preset refrigerant quantity, controlling the throttle to be in the second throttling state of working throttling until the compressor discharge port pressure is greater than the preset pressure.

[0026] According to an embodiment of the second aspect of this application, a control device for a heat exchange system is provided, including a processor and a memory storing program instructions, the processor being configured to execute the control method for a heat exchange system as described in any of the preceding claims when the program instructions are executed.

[0027] According to an embodiment of the third aspect of this application, a heat exchange system is provided, comprising: a heat exchange circuit including a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence; a refrigerant regulating branch including a liquid storage end and a liquid discharge end, the liquid storage end being connected to the heat exchange circuit located between the outdoor heat exchanger and the throttle valve, and the liquid discharge end being connected to the return port of the compressor; and a control device for the heat exchange system as described above.

[0028] In some optional embodiments, the refrigerant regulating branch includes: a liquid storage device; a liquid storage solenoid valve, located at the liquid storage end of the refrigerant regulating branch and connected to the liquid storage port of the liquid storage device; and a liquid discharge solenoid valve, located at the liquid discharge end of the refrigerant regulating branch and connected to the liquid discharge port of the liquid storage device.

[0029] The control method and apparatus for heat exchange systems and the heat exchange systems provided in this disclosure can achieve the following technical effects:

[0030] The heat exchange system includes a heat exchange loop and a refrigerant regulation branch. The refrigerant regulation branch has a storage end and a discharge end. The storage end of the refrigerant regulation branch is connected to the heat exchange loop located between the outdoor heat exchanger and the expansion valve. This allows refrigerant in the heat exchange system to enter the refrigerant regulation branch through the storage end, storing it and reducing the amount of refrigerant participating in the heat exchange cycle. Similarly, the discharge end of the refrigerant regulation branch is connected to the compressor's return port, allowing refrigerant in the refrigerant regulation branch to flow back into the heat exchange system, increasing the amount of refrigerant participating in the heat exchange. The controller can acquire the compressor discharge pressure and the operating mode of the heat exchange system. Based on these parameters, the controller can adjust the refrigerant storage in the refrigerant regulation branch, thus regulating the amount of refrigerant participating in the heat exchange cycle in the heat exchange loop. This improves the rationality of refrigerant charging under different operating conditions and enhances the performance of the heat exchange system.

[0031] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0032] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0033] Figure 1 This is a schematic flowchart of a control method for a heat exchange system provided in an embodiment of this disclosure;

[0034] Figure 2 This is a schematic flowchart of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0035] Figure 3 This is a schematic flowchart of another control method for a heat exchange system provided in an embodiment of this disclosure;

[0036] Figure 4 This is a schematic diagram of the structure of a heat exchange system provided in an embodiment of this disclosure;

[0037] Figure 5 This is a schematic diagram of another heat exchange system provided in an embodiment of this disclosure;

[0038] Figure 6 This is a schematic diagram of the structure of a control device for a heat exchange system provided in an embodiment of this disclosure.

[0039] Figure label:

[0040] 100. Processor; 101. Memory; 102. Communication interface; 103. Bus; 200. Outdoor heat exchanger; 300. Throttling device; 400. Indoor heat exchanger; 500. Refrigerant regulating branch; 510. Liquid storage device; 520. Liquid storage solenoid valve; 530. Liquid discharge solenoid valve; 600. Gas-liquid separator; 700. Compressor; 710. First pipeline; 720. Second pipeline. Detailed Implementation

[0041] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0042] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0043] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0044] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0045] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0047] like Figure 4 and Figure 5 As shown in the figure, this disclosure provides a heat exchange system, which includes a heat exchange circuit and a refrigerant regulating branch 500. The heat exchange circuit includes a compressor 700, an outdoor heat exchanger 200, a throttle valve 300, and an indoor heat exchanger 400 connected in sequence. The refrigerant regulating branch 500 includes a liquid storage end and a liquid discharge end. The liquid storage end of the refrigerant regulating branch 500 is connected to the heat exchange circuit located between the outdoor heat exchanger 200 and the indoor heat exchanger 400, and the liquid discharge end of the refrigerant regulating branch 500 is connected to the return port of the compressor 700.

[0048] In this embodiment, the heat exchange system includes a heat exchange loop and a refrigerant regulating branch 500. The refrigerant regulating branch 500 includes a liquid storage end and a liquid discharge end. The liquid storage end of the refrigerant regulating branch 500 is connected to the heat exchange loop located between the outdoor heat exchanger 200 and the throttle valve 300. Thus, refrigerant in the heat exchange system can enter the refrigerant regulating branch 500 through the liquid storage end, storing the refrigerant within it and reducing the amount of refrigerant participating in the heat exchange cycle. Similarly, the liquid discharge end of the refrigerant regulating branch 500 is connected to the return port of the compressor 700, allowing the refrigerant in the refrigerant regulating branch 500 to flow back into the heat exchange system through the liquid discharge end, increasing the amount of refrigerant participating in the heat exchange system. This embodiment can regulate the amount of refrigerant participating in the refrigerant cycle within the heat exchange system, thereby improving the rationality of refrigerant charging under different operating conditions and enhancing the performance of the heat exchange system.

[0049] Furthermore, the refrigerant regulating branch 500 includes a liquid storage device 510, a liquid storage solenoid valve 520, and a liquid discharge solenoid valve 530. The liquid storage solenoid valve 520 is located at the liquid storage end of the refrigerant regulating branch 500 and is connected to the liquid storage port of the liquid storage device 510. The liquid discharge solenoid valve 530 is located at the liquid discharge end of the refrigerant regulating branch 500 and is connected to the liquid discharge port of the liquid storage device 510.

[0050] In this embodiment, the liquid storage solenoid valve 520 is located at the liquid storage end of the refrigerant regulating branch 500, and the liquid storage solenoid valve 520 is connected to the liquid storage port of the liquid storage device 510. That is, the liquid storage end of the refrigerant regulating branch 500 is connected to the liquid storage port of the liquid storage device 510. The liquid storage end of the refrigerant regulating branch 500 is connected to the heat exchange circuit located between the outdoor heat exchanger 200 and the throttle valve 300, so that the refrigerant between the outdoor heat exchanger 200 and the throttle valve 300 can flow into the liquid storage device 510 through the liquid storage end of the refrigerant regulating branch 500 and the liquid storage solenoid valve 520.

[0051] A drain solenoid valve 530 is located at the drain end of the refrigerant regulating branch 500 and is connected to the drain port of the liquid storage device 510. In other words, the drain end of the refrigerant regulating branch 500 is connected to the drain port of the liquid storage device 510. The drain end of the refrigerant regulating branch 500 is also connected to the return port of the compressor 700. Thus, the refrigerant in the liquid storage device 510 can flow back into the compressor 700, i.e., back into the heat exchange circuit, through the drain end of the refrigerant regulating branch 500 and the drain solenoid valve 530. In this embodiment, the flow of refrigerant into or out of the liquid storage device 510 can be controlled by opening and closing the liquid storage solenoid valve 520 and the drain solenoid valve 530, thereby adjusting the amount of refrigerant participating in the heat exchange cycle, improving the rationality of refrigerant charging under different operating conditions, and enhancing the heat exchange performance of the heat exchange system.

[0052] Optionally, such as Figure 5 As shown, the heat exchange system also includes a first pipe 710, which connects the outdoor heat exchanger 200 and the throttle valve 300. The liquid storage end of the refrigerant regulating branch 500 is connected to the first position of the first pipe 710. The ratio between the length of the pipe between the first position and the outdoor heat exchanger 200 and the length of the first pipe 710 is between 1 / 4 and 3 / 4.

[0053] In this embodiment, the first pipe 710 connects the outdoor heat exchanger 200 and the throttling device 300. When the heat exchange system operates in cooling mode, the refrigerant flows sequentially through the outdoor heat exchanger 200, the first pipe 710, and the throttling device 300. The liquid storage end of the refrigerant regulating branch 500 is connected to the first position of the first pipe 710, allowing the refrigerant to flow into the refrigerant regulating branch 500 through the first position. When the refrigerant flows into the refrigerant regulating branch 500 through the first position, the amount of refrigerant in the first pipe 710 decreases, resulting in some flashing. The ratio between the length of the pipe between the first position and the outdoor heat exchanger 200 and the length of the first pipe 710 ranges from 1 / 4 to 3 / 4. This reduces the fluctuation of the refrigerant entering the throttling device 300, minimizes the throttling noise caused by refrigerant throttling within the throttling device 300, and reduces the noise during the operation of the throttling device 300. Furthermore, the ratio between the length of the pipe between the first location and the outdoor heat exchanger 200 and the length of the first pipe 710 can be 1 / 4, 7 / 24, 1 / 3, 9 / 24, 5 / 12, 11 / 24, 1 / 2, 13 / 24, 7 / 12, 5 / 8, 2 / 3, 17 / 24, 3 / 4, etc.

[0054] For example, the drain solenoid valve 530 is an electronic expansion valve. The drain solenoid valve 530 is located at the drain end of the refrigerant regulating branch 500, which is connected to the return port of the compressor 700. In this way, not only can the refrigerant in the liquid storage device 510 be selectively transferred to the compressor 700 through the opening and closing of the electronic expansion valve, but the electronic expansion valve can also throttle the refrigerant, converting the liquid refrigerant into gaseous refrigerant for supply to the return port of the compressor 700, thereby increasing the refrigerant supply to the compressor 700.

[0055] Optionally, such as Figure 5 As shown, the heat exchange system also includes a gas-liquid separator 600 and a second pipeline 720, which connects the gas-liquid separator 600 and the return port of the compressor 700. The liquid discharge end of the refrigerant regulating branch 500 is connected to a second position of the second pipeline 720, and the ratio between the length of the pipeline between the second position and the return port of the compressor 700 and the total length of the second pipeline 720 is greater than or equal to 1 / 4.

[0056] In this embodiment, the second pipeline 720 is connected between the gas-liquid separator 600 and the return port of the compressor 700. The gas separated by the gas-liquid separator 600 can flow into the return port of the compressor 700 through the second pipeline 720 to supply gas to the compressor 700. The drain end of the refrigerant regulating branch 500 is connected to the second position of the second pipeline 720, and the refrigerant in the refrigerant regulating branch 500 can be supplied to the return port of the compressor 700 through the second pipeline 720. Since the drain end is equipped with an electronic expansion valve, the refrigerant regulating branch 500 can directly supply gaseous refrigerant to the second pipeline 720 to increase the gas supply to the compressor 700.

[0057] Figure 1 This is a schematic flowchart illustrating a control method for a heat exchange system according to an embodiment of this disclosure. This control method for a heat exchange system can be executed in the controller of the heat exchange system.

[0058] S001, the controller obtains the compressor discharge port pressure and the operating mode of the heat exchange system.

[0059] S002, based on the compressor discharge pressure and the operating mode of the heat exchange system, the controller adjusts the refrigerant storage in the refrigerant regulating branch.

[0060] In this embodiment, the controller can obtain the compressor discharge port pressure and the operating mode of the heat exchange system. Based on the compressor discharge pressure and the operating mode of the heat exchange system, the controller can adjust the refrigerant storage in the refrigerant regulation branch. In other words, the controller can adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange loop, thereby improving the rationality of refrigerant charging under different operating conditions and improving the performance of the heat exchange system.

[0061] In some optional embodiments, when the compressor discharge port pressure is less than or equal to a preset pressure and the heat exchange system is in heating mode, the controller adjusts the refrigerant storage in the refrigerant regulating branch to a first preset refrigerant amount. When the compressor discharge port pressure is greater than the preset pressure and the heat exchange system is in heating mode, the controller adjusts the refrigerant storage in the refrigerant regulating branch to a second preset refrigerant amount. The first preset refrigerant amount is greater than the second preset refrigerant amount.

[0062] In this embodiment, when the heat exchange system is in heating mode, if the compressor discharge port pressure is less than or equal to a preset pressure, it indicates that the heat exchange circuit is operating at a low load, and the amount of refrigerant required in the heat exchange circuit decreases. At this time, the controller can control the refrigerant storage in the refrigerant regulating branch to a first preset refrigerant amount. If the compressor discharge port pressure is greater than the preset pressure, it indicates that the heat exchange circuit is operating at a high load, and the amount of refrigerant required in the heat exchange circuit increases. At this time, the controller can control the refrigerant storage in the refrigerant regulating branch to a second preset refrigerant amount. Since the first preset refrigerant amount is greater than the second preset refrigerant amount, the refrigerant storage in the refrigerant regulating branch is greater during low-load operation than during high-load operation. This ensures that during heating mode, the amount of refrigerant participating in the heat exchange cycle during low-load operation is less than the amount participating during high-load operation. Therefore, the amount of refrigerant participating in the heat exchange cycle can be adjusted under different operating conditions of the heat exchange circuit, improving the rationality of the refrigerant amount participating in the heat exchange cycle.

[0063] Furthermore, when the compressor discharge port pressure is less than or equal to the preset pressure and the heat exchange system is in cooling mode, the controller adjusts the refrigerant storage in the refrigerant regulating branch to a third preset refrigerant amount. When the compressor discharge port pressure is greater than the preset pressure and the heat exchange system is in cooling mode, the controller adjusts the refrigerant storage in the refrigerant regulating branch to a fourth preset refrigerant amount. The third preset refrigerant amount is greater than the fourth preset refrigerant amount.

[0064] In this embodiment, when the heat exchange system is in cooling mode, if the compressor discharge port pressure is less than or equal to a preset pressure, it indicates that the heat exchange circuit is operating at a low load, and the amount of refrigerant required in the heat exchange circuit decreases. At this time, the controller controls the refrigerant storage in the refrigerant regulating branch to a third preset refrigerant amount. If the compressor discharge port pressure is greater than the preset pressure, it indicates that the heat exchange circuit is operating at a high load, and the amount of refrigerant required in the heat exchange circuit increases. At this time, the controller controls the refrigerant storage in the refrigerant regulating branch to a fourth preset refrigerant amount. Since the third preset refrigerant amount is greater than the fourth preset refrigerant amount, the refrigerant storage in the refrigerant regulating branch is greater than the refrigerant storage participating in the heat exchange cycle when the heat exchange circuit is operating at a low load. This ensures that in heating mode, the amount of refrigerant participating in the heat exchange cycle when the heat exchange circuit is operating at a low load is less than the amount participating in the heat exchange cycle when the heat exchange circuit is operating at a high load. Therefore, the amount of refrigerant participating in the heat exchange cycle can be adjusted under different operating conditions of the heat exchange circuit, improving the rationality of the amount of refrigerant participating in the heat exchange cycle.

[0065] Optionally, the refrigerant storage capacity of the refrigerant regulating branch is adjusted to a third preset refrigerant capacity, including:

[0066] The controller controls the throttle to operate in a throttling state, controls the liquid storage solenoid valve to open to the third degree of opening, and controls the liquid discharge solenoid valve to open to the fourth degree of opening. Among these, the third degree of opening is greater than the fourth degree of opening.

[0067] When the refrigerant storage capacity of the refrigerant regulating branch is adjusted to the third preset refrigerant quantity, the heat exchange system is in cooling mode. At this time, the refrigerant flowing through the liquid storage end of the refrigerant regulating branch is high-pressure refrigerant flowing out of the outdoor heat exchanger (equivalent to the condenser), and the expansion valve can work normally to throttle. The liquid storage solenoid valve is opened to the third opening degree, and the liquid discharge solenoid valve is opened to the fourth opening degree, with the third opening degree being greater than the fourth opening degree. In this way, the refrigerant can flow into the liquid storage device through the liquid storage solenoid valve, and the gaseous refrigerant in the liquid storage device can flow out of the liquid storage device through the liquid discharge solenoid valve, thereby reducing the pressure in the liquid storage device and increasing the refrigerant storage capacity of the liquid storage device.

[0068] Optionally, the refrigerant storage capacity of the refrigerant regulating branch is adjusted to a fourth preset refrigerant capacity, including:

[0069] The controller controls the throttle to operate in a throttling state, the controller controls the liquid storage solenoid valve to close, and the controller controls the liquid discharge solenoid valve to open.

[0070] When the refrigerant storage in the refrigerant regulating branch is adjusted to the fourth preset refrigerant amount, the heat exchange system is in cooling mode. At this time, the refrigerant flowing through the liquid storage end of the refrigerant regulating branch is high-pressure refrigerant from the outdoor heat exchanger (equivalent to a condenser). The expansion valve can operate normally, improving the operational stability and reliability of the heat exchange system. When the refrigerant storage in the refrigerant regulating branch is the fourth preset refrigerant amount, which is less than the third preset refrigerant amount, the refrigerant storage in the liquid storage device can be reduced. The controller closes the liquid storage solenoid valve to reduce the inflow of refrigerant from the heat exchange circuit into the liquid storage device, thus reducing the refrigerant storage in the liquid storage device. Simultaneously, the controller opens the drain solenoid valve, allowing refrigerant in the liquid storage device to flow out, thereby reducing the refrigerant storage in the liquid storage device and bringing it back to the fourth preset refrigerant amount.

[0071] Figure 2 This is a schematic flowchart of another control method for a heat exchange system provided in an embodiment of this disclosure.

[0072] S011, the controller obtains the compressor discharge port pressure and the operating mode of the heat exchange system.

[0073] S012, after the controller controls the throttle to be in the first throttle state of being fully open and not throttling, the controller determines the refrigerant temperature difference between the first refrigerant temperature and the second refrigerant temperature.

[0074] The first refrigerant temperature is the temperature of the refrigerant after flowing through the expansion valve, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the expansion valve.

[0075] S013, the controller controls the operating status of the liquid storage solenoid valve and the liquid discharge solenoid valve according to the refrigerant temperature difference.

[0076] The heat exchange system can operate in both cooling and heating modes. In cooling mode, the refrigerant in the heat exchange circuit flows sequentially through the compressor, outdoor heat exchanger, expansion valve, and indoor heat exchanger before returning to the compressor, completing one cooling cycle. In heating mode, the refrigerant in the heat exchange circuit flows sequentially through the compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger before returning to the compressor, completing one heating cycle.

[0077] The liquid storage end of the refrigerant regulating branch is connected to the heat exchange loop located between the outdoor heat exchanger and the expansion valve. For example, when the heat exchange system is operating in heating mode, after the controller puts the expansion valve in a fully open, non-throttling first throttling state, the controller determines the refrigerant temperature difference between the first and second refrigerant temperatures. Based on this temperature difference, the controller controls the liquid storage solenoid valve and the liquid discharge solenoid valve to open or close, thereby regulating the refrigerant storage in the liquid storage device. In heating mode, the expansion valve being in a fully open, non-throttling first throttling state ensures that the refrigerant state before and after the expansion valve is the same. Thus, in both heating and cooling operating modes, the refrigerant entering the refrigerant regulating branch is in the same state, reducing the possibility of excessive gaseous refrigerant flowing into the refrigerant regulating branch after the refrigerant becomes two-phase after throttling, thus increasing the error in the refrigerant storage in the liquid storage device. This improves the accuracy of refrigerant storage in the liquid storage device and the accuracy of regulating the amount of refrigerant participating in the heat exchange cycle, thereby improving the performance of the heat exchange system.

[0078] Figure 3 This is a schematic flowchart of another control method for a heat exchange system provided in an embodiment of this disclosure.

[0079] S021, the controller obtains the compressor discharge port pressure and the operating mode of the heat exchange system.

[0080] S022, after the controller controls the throttle to be in the first throttle state of being fully open and not throttling, the controller determines the refrigerant temperature difference between the first refrigerant temperature and the second refrigerant temperature.

[0081] The first refrigerant temperature is the temperature of the refrigerant after flowing through the expansion valve, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the expansion valve.

[0082] S023, when the refrigerant temperature difference is less than or equal to the preset temperature difference, the controller controls the liquid storage solenoid valve to open to the first opening degree and maintain it for the first preset duration, and the controller also controls the liquid discharge solenoid valve to open to the second opening degree and maintain it for the second preset duration.

[0083] Wherein, the first opening degree is greater than the second opening degree, and / or, the first preset duration is greater than or equal to the second preset duration.

[0084] The expansion valve requires a certain amount of time to change from a throttling state to a fully open, non-throttling state. When the temperature difference between the first and second refrigerant temperatures before and after the expansion valve is less than or equal to a preset temperature difference, it indicates that the expansion valve is in its first throttling state (fully open, non-throttling). The state of the refrigerant flowing through the expansion valve is essentially the same as the state of the refrigerant flowing out of the indoor heat exchanger. At this time, the controller controls the liquid receiver solenoid valve to open to its first opening degree and the liquid drain solenoid valve to its second opening degree, with the first opening degree being greater than the second opening degree. This allows refrigerant to flow into the liquid receiver via the liquid receiver solenoid valve, and the gaseous refrigerant in the liquid receiver can flow out via the liquid drain solenoid valve, reducing the pressure in the liquid receiver and increasing its refrigerant storage capacity. For example, when the compressor discharge port pressure is less than or equal to a preset pressure, the refrigerant storage capacity of the liquid receiver can be increased to the first preset refrigerant amount.

[0085] The liquid storage solenoid valve opens for a first preset duration, and the liquid discharge solenoid valve opens for a second preset duration, with the first preset duration being greater than or equal to the second preset duration. When the liquid discharge solenoid valve just closes, the pressure inside the liquid storage device is relatively low, but refrigerant can still be supplied to the liquid storage device through the liquid storage solenoid valve. This allows the amount of refrigerant stored in the liquid storage device to be continuously increased when the liquid storage solenoid valve is open, thereby improving the refrigerant storage efficiency.

[0086] Furthermore, when the refrigerant temperature difference is less than or equal to the preset temperature difference, the controller obtains the first opening adjustment value of the liquid storage solenoid valve corresponding to the refrigerant temperature difference, and the second opening adjustment value of the liquid discharge solenoid valve corresponding to the refrigerant temperature difference.

[0087] Based on the current opening value of the liquid storage solenoid valve, the controller adjusts the opening of the liquid storage solenoid valve according to the first opening adjustment value. Based on the current opening value of the liquid discharge solenoid valve, the controller adjusts the opening of the liquid discharge solenoid valve according to the second opening adjustment value.

[0088] When the refrigerant temperature difference is less than or equal to a preset temperature difference, the liquid receiver solenoid valve is controlled to open to the first opening degree. Within the first preset time period, if the throttle valve continues to open before reaching the fully open state, or if the refrigerant temperature difference changes due to other factors, the controller can adjust the first opening degree of the liquid receiver solenoid valve according to the first opening degree adjustment value corresponding to the refrigerant temperature difference, and adjust the second opening degree of the liquid discharge solenoid valve according to the second opening degree adjustment value corresponding to the refrigerant temperature difference, so as to improve the liquid storage efficiency of the liquid receiver.

[0089] Optionally, the first opening adjustment value is positively correlated with the refrigerant temperature difference, and the second opening adjustment value is positively correlated with the refrigerant temperature difference.

[0090] The greater the refrigerant temperature difference, the higher the content of gaseous refrigerant in the refrigerant flowing through the expansion valve; conversely, the smaller the temperature difference, the lower the content of gaseous refrigerant. A higher content of gaseous refrigerant in the refrigerant flowing through the expansion valve allows for an increase in the opening of the liquid receiver solenoid valve, thereby increasing the flow rate at the liquid receiver end of the refrigerant regulating branch. This results in an increase in the amount of liquid refrigerant entering the liquid receiver within the same timeframe. Simultaneously, the amount of gaseous refrigerant flowing into the liquid receiver also increases. Increasing the opening of the discharge solenoid valve further increases the discharge of gaseous refrigerant from the liquid receiver, reducing the pressure within the receiver and improving its storage capacity.

[0091] When the amount of gaseous refrigerant in the refrigerant flowing through the throttle is lower, the amount of liquid refrigerant is higher. In this case, even if the opening of the liquid storage solenoid valve is small, more liquid refrigerant can flow into the liquid storage device. Furthermore, less gaseous refrigerant flows into the liquid storage device, which can correspondingly reduce the opening of the drain solenoid valve.

[0092] S024, when the liquid storage solenoid valve is opened, the timing starts, and after the controller controls the throttle to maintain the first throttling state for a third preset time, the controller controls the throttle to enter the second throttling state of working throttling.

[0093] Before the receiver-of-charge solenoid valve opens, the expander is in the first throttling state, fully open and not throttling. After the receiver-of-charge solenoid valve opens, the expander remains in the first throttling state, fully open and not throttling. During the heating and receiver-of-charge process, the expander operates in a fully open, non-throttling state. Therefore, when unthrottled refrigerant flows directly from the indoor heat exchanger to the outdoor heat exchanger, it can interfere with the normal operation of the outdoor heat exchanger and even the compressor, reducing the heat exchange performance of the system.

[0094] In this embodiment, after the controller controls the throttle to maintain the first throttling state for a third preset time, it enters the second throttling state of working throttling. This allows the throttle to continue working throttling after being fully open and no longer throttling, thereby reducing the refrigerant pressure entering the outdoor heat exchanger and improving the working stability of the outdoor heat exchanger.

[0095] Optionally, the third preset duration is less than or equal to the first preset duration. After the throttling device maintains the first throttling state for the third preset duration, it will start throttling. When the throttling device changes from the first throttling state to the second throttling state, there will still be a period of time during which the refrigerant temperature difference is less than or equal to the preset temperature difference. During this period, the liquid storage solenoid valve can also be opened to increase the refrigerant storage capacity of the liquid storage device.

[0096] S025, the controller obtains the refrigerant quantity of the liquid storage device.

[0097] S026, when the amount of refrigerant in the liquid storage device is less than the first preset amount of refrigerant, the controller controls the throttle to be in the second throttle state of working throttle.

[0098] S027, after the controller controls the throttle to maintain the second throttling state for a fourth preset time, the controller controls the throttle to be in the first throttling state of being fully open and not throttling.

[0099] If the refrigerant level in the liquid receiver is less than the first preset refrigerant level, it indicates that the refrigerant level in the liquid receiver is insufficient and needs to be replenished. At this time, the controller controls the throttle valve to maintain the second throttling state for a fourth preset time, and then controls the throttle valve to return to the first throttling state. When the refrigerant temperature difference between the first and second refrigerant temperatures is less than or equal to the preset temperature difference, the controller again controls the operation of the liquid receiver solenoid valve and the liquid drain solenoid valve to increase the refrigerant level in the liquid receiver.

[0100] In this embodiment of the disclosure, the throttle can alternate between a working throttle state and a fully open non-throttle state, so as to increase the refrigerant storage in the liquid storage device while also taking into account the refrigerant state entering the outdoor heat exchanger, thereby improving the operational stability of the outdoor heat exchanger and the compressor.

[0101] Optionally, when the amount of refrigerant in the liquid storage device is greater than or equal to the first preset amount of refrigerant, the controller controls the throttle to be in the second throttling state of working throttling until the compressor discharge port pressure is greater than the preset pressure.

[0102] For example, adjusting the refrigerant storage in the refrigerant regulating branch to a second preset refrigerant quantity includes:

[0103] The controller controls the throttle to operate in a throttling state, and also controls the liquid storage solenoid valve to close and the liquid discharge solenoid valve to open.

[0104] When the refrigerant level in the second reservoir is lower than that in the first, the amount of refrigerant in the receiver needs to be reduced. The controller can close the receiver solenoid valve to reduce refrigerant flow into the receiver, thus preventing an increase in the refrigerant level. Conversely, opening the drain solenoid valve connects the drain end of the refrigerant regulating branch to the compressor's return port. Under the compressor's traction, refrigerant in the receiver flows into the compressor through the drain solenoid valve, reducing the refrigerant level in the receiver and increasing the amount of refrigerant participating in the heat exchange cycle.

[0105] Combination Figure 6As shown, this disclosure provides a control device for a heat exchange system, including a processor 100 and a memory 101. Optionally, the control device may further include a communication interface 102 and a bus 103. The processor 100, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call logical instructions in the memory 101 to execute the control method for the heat exchange system described in the above embodiment.

[0106] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0107] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 100 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, thereby implementing the control method for the heat exchange system in the above embodiments.

[0108] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0109] This disclosure provides a heat exchange system, which further includes the aforementioned control device for the heat exchange system. The control device is installed in the heat exchange loop or the refrigerant regulation loop. The installation relationship described herein is not limited to placement within the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the control device for the heat exchange system can be adapted to feasible product bodies to achieve other feasible embodiments.

[0110] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the control method for a heat exchange system described above.

[0111] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0112] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0113] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0114] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0115] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0116] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a heat exchange system, characterized in that, The heat exchange system includes a heat exchange loop and a refrigerant regulation branch. The heat exchange loop includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence. The liquid storage end of the refrigerant regulation branch is connected to the heat exchange loop located between the outdoor heat exchanger and the throttle valve. The liquid discharge end of the refrigerant regulation branch is connected to the compressor's return port. The refrigerant regulation branch includes a liquid storage solenoid valve, a liquid storage device, and a liquid discharge solenoid valve connected in sequence. The liquid storage solenoid valve is located at the liquid storage end of the refrigerant regulation branch and is connected to the liquid storage port of the liquid storage device. The liquid discharge solenoid valve is located at the liquid discharge end of the refrigerant regulation branch and is connected to the liquid discharge port of the liquid storage device. The control method includes: Obtain the compressor discharge port pressure and the operating mode of the heat exchange system; Adjust the refrigerant storage in the refrigerant regulating branch according to the compressor discharge port pressure and the operating mode of the heat exchange system. The refrigerant storage capacity of the refrigerant regulating branch includes: After controlling the throttle to be in the first throttle state of being fully open and not throttling, the refrigerant temperature difference between the first refrigerant temperature and the second refrigerant temperature is determined; wherein, the first refrigerant temperature is the temperature of the refrigerant after flowing through the throttle, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the throttle. When the refrigerant temperature difference is less than or equal to a preset temperature difference, the liquid receiving solenoid valve is controlled to open to a first opening degree and maintained for a first preset duration, and the liquid discharge solenoid valve is controlled to open to a second opening degree and maintained for a second preset duration; wherein, the first opening degree is greater than the second opening degree, and the first preset duration is greater than or equal to the second preset duration; and / or, when the refrigerant temperature difference is less than or equal to the preset temperature difference, a first opening degree adjustment value of the liquid receiving solenoid valve corresponding to the refrigerant temperature difference and a second opening degree adjustment value of the liquid discharge solenoid valve corresponding to the refrigerant temperature difference are obtained; based on the current opening degree value of the liquid receiving solenoid valve, the opening degree of the liquid receiving solenoid valve is adjusted according to the first opening degree adjustment value; based on the current opening value of the liquid discharge solenoid valve, the opening degree of the liquid discharge solenoid valve is adjusted according to the second opening degree adjustment value.

2. The control method according to claim 1, characterized in that, Adjust the refrigerant storage in the refrigerant regulating branch according to the compressor discharge pressure and the operating mode of the heat exchange system, including: When the compressor discharge port pressure is less than or equal to the preset pressure and the heat exchange system is in heating mode, adjust the refrigerant storage in the refrigerant regulating branch to the first preset refrigerant amount. When the compressor discharge port pressure is greater than the preset pressure and the heat exchange system is in heating mode, adjust the refrigerant storage in the refrigerant regulating branch to the second preset refrigerant amount. The first preset refrigerant quantity is greater than the second preset refrigerant quantity.

3. The control method according to claim 2, characterized in that, Adjusting the refrigerant storage in the refrigerant regulating branch according to the compressor discharge pressure and the operating mode of the heat exchange system also includes: When the compressor discharge port pressure is less than or equal to the preset pressure and the heat exchange system is in cooling mode, adjust the refrigerant storage in the refrigerant regulating branch to the third preset refrigerant amount. When the compressor discharge port pressure is greater than the preset pressure and the heat exchange system is in cooling mode, adjust the refrigerant storage in the refrigerant regulating branch to the fourth preset refrigerant amount. The third preset refrigerant quantity is greater than the fourth preset refrigerant quantity.

4. The control method according to claim 3, characterized in that, Adjusting the refrigerant storage in the refrigerant regulating branch to a third preset refrigerant quantity includes: controlling the expansion valve to operate in a throttling state, controlling the liquid receiver solenoid valve to open to a third opening degree, and controlling the liquid drain solenoid valve to open to a fourth opening degree; wherein the third opening degree is greater than the fourth opening degree; and / or, Adjusting the refrigerant storage in the refrigerant regulating branch to the fourth preset refrigerant amount includes: controlling the throttle to the working throttle state, controlling the liquid storage solenoid valve to close, and controlling the liquid discharge solenoid valve to open.

5. The control method according to claim 1, characterized in that, The first opening adjustment value is positively correlated with the refrigerant temperature difference.

6. The control method according to claim 1, characterized in that, The second opening adjustment value is positively correlated with the refrigerant temperature difference.

7. The control method according to claim 1, characterized in that, Adjusting the refrigerant storage in the refrigerant regulating branch also includes: The timing starts when the liquid storage solenoid valve is opened. After the throttle is controlled to maintain the first throttling state for a third preset time, the throttle is controlled to enter the second throttling state of working throttling. The third preset duration is less than or equal to the first preset duration.

8. The control method according to claim 1, characterized in that, Adjusting the refrigerant storage in the refrigerant regulating branch also includes: Obtain the refrigerant quantity of the liquid storage device; When the amount of refrigerant in the liquid storage device is less than the first preset amount of refrigerant, the throttle valve is controlled to be in the second throttle state of working throttle. After the throttle maintains the second throttling state for a fourth preset time, the throttle is then controlled to be in the first throttling state, which is fully open and not throttling.

9. The control method according to claim 8, characterized in that, Adjusting the refrigerant storage in the refrigerant regulating branch also includes: When the amount of refrigerant in the liquid storage device is greater than or equal to the first preset amount of refrigerant, the throttle valve is controlled to be in the second throttle state of working throttle until the pressure at the compressor discharge port is greater than the preset pressure.

10. A control device for a heat exchange system, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute, when running the program instructions, the control method for a heat exchange system as described in any one of claims 1 to 9.

11. A heat exchange system, characterized in that, include: The heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle valve, and an indoor heat exchanger connected in sequence. The refrigerant regulating branch includes a liquid receiver and a liquid drain. The liquid receiver is connected to the heat exchange circuit located between the outdoor heat exchanger and the expansion valve, and the liquid drain is connected to the compressor's return port; and, The control device for a heat exchange system as described in claim 10.

12. The heat exchange system according to claim 11, characterized in that, The refrigerant regulation branch includes: liquid storage device; The liquid storage solenoid valve is located at the liquid storage end of the refrigerant regulating branch and is connected to the liquid storage port of the liquid storage device; The drain solenoid valve is located at the drain end of the refrigerant regulating branch and is connected to the drain port of the liquid storage device.

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