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. The heat exchange circuit comprises a compressor, a condenser, a throttling device and an evaporator which are connected in sequence. The first end of the refrigerant adjusting branch is connected with the heat exchange circuit between the condenser and the throttling device, and the second end of the refrigerant adjusting branch is connected with the heat exchange circuit between the throttling device and the evaporator. The control method comprises the following steps: obtaining the operating parameters of the heat exchange system; and adjusting the refrigerant storage capacity of the refrigerant adjusting branch according to the operating parameters of the heat exchange system. According to the application, the operating parameters of the heat exchange system can be obtained, and the refrigerant storage capacity of the refrigerant adjusting branch is adjusted according to the operating parameters of the heat exchange, so that the rationality of the refrigerant amount participating in the heat exchange cycle 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] The present application relates to the technical field of heat exchange systems, for example to a control method and device for a heat exchange system, and a heat exchange system. BACKGROUND

[0002] The refrigerant in the air conditioning system circulates in the system to realize the refrigeration operation or the heating operation mode. When the air conditioner operates in different load refrigeration modes or different load heating modes, the optimal refrigerant circulation amount required by the heat exchange system is different, but the refrigerant charge amount of the heat exchange system is fixed and unchanged. When the refrigeration outside is high temperature or the heating outside is low temperature, the rated refrigerant amount may cause the air conditioning system to operate in overload, resulting in poor refrigeration or heating effect. When the refrigeration outside is low temperature or the heating outside is high temperature, the air conditioning system operates in low load, and the refrigerant amount may be in the condition of excessive amount. This part of refrigerant does not play a role in heat exchange in the system operation, resulting in low operation energy efficiency of the temperature regulating equipment unit and the best performance of the heat exchange system cannot be achieved.

[0003] In the related art, the opening degree of the throttling device is generally adjusted to adjust the refrigerant in the heat exchange system, so as to depressurize, cool or pressurize, and heat the refrigerant, so that the state of the refrigerant meets the demand of the indoor heat exchanger, and the heat exchange system is in a relatively good state.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] Since the opening degree adjustment capability of the throttling device is limited and the adjustment range is small, when the required refrigerant in the heat exchange system is greatly different, the throttling device cannot meet the refrigerant adjustment demand, and the performance of the heat exchange system is poor.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general review, nor is it intended to determine key / important constituent elements or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0008] The embodiments of the present disclosure provide a control method and device for a heat exchange system, and a heat exchange system, to adjust the refrigerant amount participating in the heat exchange cycle in the heat exchange system and improve the performance of the heat exchange system.

[0009] According to an embodiment of the first aspect of the present application, a control method for a heat exchange system is provided. The heat exchange system comprises a heat exchange circuit and a refrigerant regulating branch. The heat exchange circuit comprises a compressor, a condenser, a throttling device and an evaporator connected in sequence. The refrigerant regulating branch is connected to the heat exchange circuit between the condenser and the throttling device at a first end, and connected to the heat exchange circuit between the throttling device and the evaporator at a second end. The control method comprises: obtaining an operating parameter of the heat exchange system; and adjusting a refrigerant storage of the refrigerant regulating branch according to the operating parameter of the heat exchange system.

[0010] In some optional embodiments, the operating parameter of the heat exchange system comprises an operating load of the heat exchange system; and the adjusting of the refrigerant storage of the refrigerant regulating branch according to the operating parameter of the heat exchange system comprises: reducing the refrigerant storage of the refrigerant regulating branch when the operating load of the heat exchange system is a high load operation; and increasing the refrigerant storage of the refrigerant regulating branch when the operating load of the heat exchange system is a low load operation.

[0011] In some optional embodiments, the refrigerant regulating branch comprises an electromagnetic valve, a liquid storage device and a self-excited expansion valve connected in sequence. The electromagnetic valve is arranged at the first end of the refrigerant regulating branch, and connected to a first port of the liquid storage device. The self-excited expansion valve is arranged at the second end of the refrigerant regulating branch, and connected to a second port of the liquid storage device. The opening degree of the self-excited expansion valve is related to the pressure difference between the two ends of the self-excited expansion valve. The operating parameter of the heat exchange system comprises a first refrigerant pressure of the refrigerant between the evaporator and the throttling device, and a second refrigerant pressure in the liquid storage device. The adjusting of the refrigerant storage of the refrigerant regulating branch according to the operating parameter of the heat exchange system comprises: obtaining a target opening degree of the self-excited expansion valve; determining a target pressure difference between the two ends of the self-excited expansion valve corresponding to the target opening degree of the self-excited expansion valve; wherein the target pressure difference is the difference between the target refrigerant pressure of the liquid storage device and the first refrigerant pressure; determining the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference; and controlling the opening degree of the electromagnetic valve according to the target refrigerant pressure and the second refrigerant pressure.

[0012] In some optional embodiments, the determining of the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference comprises: determining the target opening degree of the self-excited expansion valve as a first opening degree when the first refrigerant pressure is greater than or equal to a preset pressure; determining the target pressure difference corresponding to the first opening degree as a first pressure difference; and determining the target refrigerant pressure as a first target refrigerant pressure according to the first refrigerant pressure and the first pressure difference; and / or,

[0013] In some optional embodiments, the determining of the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference comprises: determining the target opening degree of the self-excited expansion valve as a second opening degree when the first refrigerant pressure is less than the preset pressure; determining the target pressure difference corresponding to the second opening degree as a second pressure difference; and determining the target refrigerant pressure as a second target refrigerant pressure according to the first refrigerant pressure and the second pressure difference.

[0014] The first opening degree is less than the second opening degree, and the first target refrigerant pressure is less than the second target refrigerant pressure.

[0015] In some optional embodiments, the opening degree of the electromagnetic valve is controlled according to the target refrigerant pressure and the second refrigerant pressure, including: in a case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is greater than the first target refrigerant pressure, the electromagnetic valve is controlled to open to a third opening degree;

[0016] In a case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is equal to the first target refrigerant pressure, the electromagnetic valve is controlled to open to a fourth opening degree;

[0017] In a case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is less than the first target refrigerant pressure, the electromagnetic valve is controlled to open to a fifth opening degree;

[0018] The third opening degree is greater than the fourth opening degree, and the fourth opening degree is greater than the fifth opening degree.

[0019] In some optional embodiments, the opening degree of the electromagnetic valve is controlled according to the target refrigerant pressure and the second refrigerant pressure, and further including: in a case where the target refrigerant pressure is the second target refrigerant pressure, the electromagnetic valve is controlled to open;

[0020] In a case where the second refrigerant pressure is greater than the second target refrigerant pressure and a pressure difference between the second refrigerant pressure and the second target refrigerant pressure is greater than a preset pressure difference, the electromagnetic valve is controlled to close.

[0021] In some optional embodiments, in a case where the operation mode of the heat exchange system is a refrigeration operation mode, the opening pressure difference of the self-excited expansion valve is determined as a third pressure difference;

[0022] In a case where the operation mode of the heat exchange system is a heating operation mode, the opening pressure difference of the self-excited expansion valve is determined as a fourth pressure difference; and the third pressure difference is greater than the fourth pressure difference.

[0023] According to an embodiment of the second aspect of the present 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 the heat exchange system as described in any of the preceding embodiments when running the program instructions.

[0024] According to an embodiment of the third aspect of the present application, a heat exchange system is provided, including: a heat exchange circuit including a compressor, a condenser, a throttling device and an evaporator connected in sequence; a refrigerant regulating branch, a first end of the refrigerant regulating branch being connected to the heat exchange circuit between the condenser and the throttling device, and a second end of the refrigerant regulating branch being connected to the heat exchange circuit between the throttling device and the evaporator; and a control device for the heat exchange system as described in the preceding embodiments.

[0025] In some optional embodiments, the refrigerant regulating branch comprises: a liquid storage device; an electromagnetic valve arranged at a first end of the refrigerant regulating branch, the electromagnetic valve being connected with a first port of the liquid storage device; and a self-excited expansion valve arranged at a second end of the refrigerant regulating branch, the self-excited expansion valve being connected with a second port of the liquid storage device, and the opening degree of the self-excited expansion valve being related to the pressure difference between two ends of the self-excited expansion valve.

[0026] The control method and device for the heat exchange system and the heat exchange system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0027] The heat exchange system comprises a heat exchange circuit and a refrigerant regulating branch. The first end of the refrigerant regulating branch is connected with the refrigerant circuit between the condenser and the throttling device, and the second end of the refrigerant regulating branch is connected with the heat exchange circuit between the throttling device and the evaporator. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch through the first end or the second end of the refrigerant regulating branch, so as to store the refrigerant in the refrigerant regulating branch and reduce the amount of refrigerant participating in the heat exchange cycle. Similarly, the refrigerant in the refrigerant regulating branch can flow into the heat exchange system through the second end or the first end of the refrigerant regulating branch, so as to increase the amount of refrigerant participating in the heat exchange cycle. The embodiments of the present disclosure can obtain the operating parameters of the heat exchange system, and adjust the refrigerant storage capacity of the refrigerant regulating branch according to the operating parameters of the heat exchange, so as to improve the rationality of the amount of refrigerant participating in the heat exchange cycle of the heat exchange system under different operating conditions, and improve the performance of the heat exchange system.

[0028] The foregoing general description and the following description are only exemplary and explanatory, and are not intended to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0029] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and are not intended to be limiting of the embodiments, in which like reference numerals refer to like elements in the drawings and in which:

[0030] Figure 1 is a flowchart of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0031] Figure 2 is a flowchart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0032] Figure 3 is a flowchart of still another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0033] Figure 4 is a flowchart of still another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0034] Figure 5 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0035] Figure 6 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0036] Figure 7 is a structural schematic diagram of a control device for a heat exchange system provided by an embodiment of the present disclosure.

[0037] Reference signs:

[0038] 100, processor; 101, memory; 102, communication interface; 103, bus; 200, compressor; 300, condenser; 400, throttling device; 500, evaporator; 600, refrigerant regulating branch; 610, electromagnetic valve; 620, liquid storage device; 630, self-excited expansion valve. DETAILED DESCRIPTION

[0039] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0040] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0041] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0042] In addition, the terms "set", "connected", and "fixed" should be understood broadly. For example, "connected" can be fixed connection, detachable connection, or integral configuration; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection via an intermediate medium, or internal communication between two devices, elements, or components. Those of ordinary skill in the art can understand the specific meaning of the above terms in the embodiments of the present disclosure according to the specific circumstances.

[0043] The term "and / or" is a description of the association relationship of the objects, which means that there can be three relationships. For example, A and / or B means that there are three relationships of A or B, or A and B.

[0044] It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0045] The present disclosure provides a heat exchange system, which comprises a heat exchange circuit and a refrigerant adjusting branch 600. Figure 5 and Figure 6 As shown in the drawings, the heat exchange system comprises a heat exchange circuit and a refrigerant adjusting branch 600, the heat exchange circuit comprises a compressor 200, a condenser 300, a throttling device 400, and an evaporator 500 connected in sequence, the first end of the refrigerant adjusting branch 600 is connected with the heat exchange circuit between the condenser 300 and the throttling device 400, and the second end of the refrigerant adjusting branch 600 is connected with the heat exchange circuit between the throttling device 400 and the evaporator 500.

[0046] In the present embodiment, the heat exchange system comprises a heat exchange circuit and a refrigerant adjusting branch 600, the first end of the refrigerant adjusting branch 600 is connected with the refrigerant circuit between the condenser 300 and the throttling device 400, and the second end of the refrigerant adjusting branch 600 is connected with the heat exchange circuit between the throttling device 400 and the evaporator 500. In this way, the refrigerant in the heat exchange system can enter the refrigerant adjusting branch 600 through the first end of the refrigerant adjusting branch 600 or the second end of the refrigerant adjusting branch 600, so as to store the refrigerant in the refrigerant adjusting branch 600 and reduce the amount of refrigerant participating in the heat exchange cycle. Similarly, the refrigerant in the refrigerant adjusting branch 600 can flow into the heat exchange system through the second end of the refrigerant adjusting branch 600 or the first end of the refrigerant adjusting branch 600, so as to increase the amount of refrigerant participating in the heat exchange cycle. The present disclosure can adjust the refrigerant storage capacity of the refrigerant adjusting branch 600, so as to improve the rationality of the amount of refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions, and improve the performance of the heat exchange system.

[0047] Optionally, the condenser 300 is an outdoor heat exchanger, and the evaporator 500 is an indoor heat exchanger. As shown in the drawings, Figure 6As shown, when the heat exchange system is operating in cooling mode, the refrigerant flows out of the compressor 200, passes sequentially through the condenser 300, the throttling device 400, and the evaporator 500, and then flows back into the compressor 200 to complete one refrigeration cycle. During this time, the refrigerant condenses and releases heat in the condenser 300. The refrigerant evaporates and absorbs heat in the evaporator 500, absorbing heat from the room and providing cooling to lower the indoor temperature.

[0048] like Figure 5 As shown, when the heat exchange system is operating in heating mode, the refrigerant flows out of the compressor 200, passes sequentially through the evaporator 500, the throttling device 400, and the condenser 300, and then flows back into the compressor 200 to complete one heating cycle. During this time, the refrigerant condenses and releases heat in the evaporator 500 to increase the indoor temperature. The refrigerant evaporates and absorbs heat in the condenser 300, becoming a gaseous refrigerant that is then supplied to the compressor 200.

[0049] In some alternative embodiments, such as Figure 5 and Figure 6 As shown, the refrigerant regulating branch 600 includes a solenoid valve 610, a liquid storage device 620, and a self-excited expansion valve 630 connected in sequence. The solenoid valve 610 is located at the first end of the refrigerant regulating branch 600 and is connected to the first port of the liquid storage device 620. The self-excited expansion valve 630 is located at the second end of the refrigerant regulating branch 600 and is connected to the second port of the liquid storage device 620. The opening degree of the self-excited expansion valve 630 is related to the pressure difference across the self-excited expansion valve 630.

[0050] In this optional embodiment, the solenoid valve 610 is located at the first end of the refrigerant regulating branch 600. The solenoid valve 610 is connected to the first port of the liquid storage device 620, and the first end of the refrigerant regulating branch 600 is connected to the heat exchange circuit between the condenser 300 and the throttling device 400. Thus, the opening and closing of the solenoid valve 610 can control the flow between the heat exchange circuit between the condenser 300 and the throttling device 400 and the liquid storage device 620. This allows refrigerant to flow into the liquid storage device 620 through the heat exchange circuit, or from the liquid storage device 620 into the heat exchange circuit, or prevents refrigerant from flowing between the heat exchange circuit and the liquid storage device 620, thereby regulating the amount of refrigerant stored in the liquid storage device 620 and the amount of refrigerant participating in the heat exchange cycle.

[0051] The self-excited expansion valve 630 is arranged at the second end of the refrigerant regulating branch 600, and is connected with the second port of the liquid storage device 620. The second end of the refrigerant regulating branch 600 is connected with the heat exchange circuit between the throttling device 400 and the evaporator 500. In this way, the refrigerant between the throttling device 400 and the evaporator 500 can flow into the liquid storage device 620 through the self-excited expansion valve 630 and the second end of the refrigerant regulating branch 600, so as to regulate the refrigerant storage in the liquid storage device 620. The opening degree of the self-excited expansion valve 630 is related to the pressure difference between the two ends of the self-excited expansion valve 630. In this way, the opening and closing and the opening degree of the self-excited expansion valve 630 can be regulated by adjusting the difference between the pressure of the refrigerant in the heat exchange circuit between the evaporator 500 and the throttling device 400 and the pressure of the refrigerant in the liquid storage device 620.

[0052] Further, the self-excited expansion valve 630 is opened when the pressure difference between the two ends of the self-excited expansion valve 630 is greater than or equal to the opening pressure difference. The self-excited expansion valve 630 is closed when the pressure difference between the two ends of the self-excited expansion valve 630 is less than the opening pressure difference.

[0053] When the self-excited expansion valve 630 is opened, the opening degree of the self-excited expansion valve 630 is proportional to the pressure difference between the two ends of the self-excited expansion valve 630. Specifically, the greater the pressure difference between the two ends of the self-excited expansion valve 630, the greater the opening degree of the self-excited expansion valve 630. The smaller the pressure difference between the two ends of the self-excited expansion valve 630, the smaller the opening degree of the self-excited expansion valve 630.

[0054] For example, the self-excited expansion valve 630 comprises a valve body, a valve seat, a valve core and a control member. The valve body is arranged at the second end of the refrigerant regulating branch 600. The first end of the valve body is connected with the heat exchange circuit between the throttling device 400 and the evaporator 500. The other end of the valve body is connected with the liquid storage device 620. The valve seat, the valve core and the control member are arranged in the valve body. The valve seat is used for mounting the valve core and the control member. The valve core is used for controlling the opening degree of the valve seat. The control member is used for driving the valve core to move and cooperating with the valve core to control the opening degree of the valve seat. The valve body is sleeved with the valve seat. The valve core is arranged in the valve seat and cooperates with the control member to control the opening and closing of the self-excited expansion valve 630. The control member is arranged between the valve seat and the valve core, and one end of the control member abuts against the valve seat and the other end abuts against the valve core.

[0055] When the pressure difference between the two ends of the self-excited expansion valve 630 is greater than or equal to the opening pressure difference, the valve core can control the flow capacity of the self-excited expansion valve 630 under the action of the control member and the refrigerant pressure difference. In this way, the self-excited expansion valve 630 can be controlled to open and close by the pressure difference, and the self-excited expansion valve 630 can be unidirectionally conducted.

[0056] Optionally, the control member comprises an elastic component. For example, the control member comprises a spring.

[0057] Figure 1 is a flowchart of a control method for a heat exchange system provided by an embodiment of the present disclosure. The control method for the heat exchange system can be executed in a controller of the heat exchange system.

[0058] S011, the controller acquires an operating parameter of the heat exchange system.

[0059] S012, according to the operating parameter of the heat exchange system, the controller adjusts a refrigerant storage of a refrigerant adjustment branch.

[0060] In this embodiment, the operating parameter of the heat exchange system can be acquired, and the refrigerant storage of the refrigerant adjustment branch is adjusted according to the operating parameter of the heat exchange system, so as to adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit, so that the amount of refrigerant participating in the heat exchange cycle is different under different operating parameters of the heat exchange system, so as to improve the rationality of the amount of refrigerant participating in the heat exchange cycle under different operating conditions of the heat exchange system, and improve the performance of the heat exchange system.

[0061] In some optional embodiments, the operating parameter of the heat exchange system includes an operating load of the heat exchange system. According to the operating parameter of the heat exchange system, adjusting the refrigerant storage of the refrigerant adjustment branch includes: in the case that the operating load of the heat exchange system is high load operation, reducing the refrigerant storage of the refrigerant adjustment branch; in the case that the operating load of the heat exchange system is low load, increasing the refrigerant storage of the refrigerant adjustment branch.

[0062] With this optional embodiment, in the case that the heat exchange system is high load operation, the heat exchange amount of the heat exchange system increases, and the amount of refrigerant participating in the heat exchange cycle required by the heat exchange system increases. At this time, the controller can reduce the refrigerant storage of the refrigerant adjustment branch, so that the refrigerant returns to the heat exchange circuit, so as to increase the amount of refrigerant participating in the heat exchange cycle, thereby improving the performance of the heat exchange system.

[0063] When the heat exchange system is low load operation, the heat exchange amount of the heat exchange system decreases. The amount of refrigerant participating in the heat exchange cycle can be reduced, and a smaller amount of refrigerant can meet the heat exchange amount required by the heat exchange system when the heat exchange system is low load operation. At this time, the refrigerant storage of the refrigerant adjustment branch can be increased, and the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit can be reduced, so as to reduce the situation that more refrigerant participating in the heat exchange cycle increases energy consumption, thereby improving the heat exchange performance of the heat exchange system.

[0064] Further, the operating load of the heat exchange system can be determined in the following manner: the controller acquires the operating frequency of the compressor. In the case that the operating frequency of the compressor is greater than or equal to a preset frequency, the controller determines that the operating load of the heat exchange system is high load operation. In the case that the operating frequency of the compressor is less than the preset frequency, the controller determines that the operating load of the heat exchange system is low load operation.

[0065] When the operating frequency of the compressor is large, that is, when the compressor is operated at a high frequency, the heat exchange amount of the heat exchange system increases, and it can be determined that the operating load of the heat exchange system is a high-load operation. When the operating frequency of the compressor is small, that is, when the compressor is operated at a low frequency, the heat exchange amount of the heat exchange system decreases, and it can be determined that the operating load of the heat exchange system is a low-load operation.

[0066] Figure 2 is a flowchart of another control method for a heat exchange system provided by the embodiments of the present disclosure. The control method for the heat exchange system can be executed in a controller of the heat exchange system.

[0067] S021, the controller obtains an operating parameter of the heat exchange system.

[0068] Exemplarily, the operating parameter of the heat exchange system further includes a first refrigerant pressure of the refrigerant between the evaporator and the throttling device and a second refrigerant pressure in the liquid storage device.

[0069] In this embodiment, the operating parameter of the heat exchange system further includes the first refrigerant pressure and the second refrigerant pressure, that is, the controller obtains the refrigerant pressures before and after the self-excited expansion valve. When the refrigerant flows along the compressor, the evaporator, the throttling device and the condenser, the first refrigerant pressure is the refrigerant pressure before the self-excited expansion valve, and the second refrigerant pressure is the refrigerant pressure after the self-excited expansion valve. When the refrigerant flows along the compressor, the condenser, the throttling device and the evaporator, the first refrigerant pressure is the refrigerant pressure after the self-excited expansion valve, and the second refrigerant pressure is the refrigerant pressure before the self-excited expansion valve.

[0070] S022, the controller obtains a target opening degree of the self-excited expansion valve.

[0071] Further, the target opening degree of the self-excited expansion valve can be determined in the following manner:

[0072] In the case where the operating mode of the heat exchange system is the heating operating mode, the controller obtains the first refrigerant pressure of the refrigerant between the evaporator and the throttling device. In the case where the first refrigerant pressure is greater than or equal to a preset pressure, the controller determines that the target opening degree of the self-excited expansion valve is a first opening degree; in the case where the first refrigerant pressure is less than the preset pressure, the controller determines that the target opening degree of the self-excited expansion valve is a second opening degree; wherein the first opening degree is less than the second opening degree.

[0073] In the embodiment, when the operation mode of the heat exchange system is the heating operation mode, the refrigerant flows between the compressor, the evaporator, the throttling device and the condenser in turn. In the case that the first refrigerant pressure is greater than or equal to the preset pressure, that is, the operation frequency of the compressor is greater than or equal to the preset frequency, the operation load of the heat exchange system is high load, and it is required to reduce the refrigerant storage in the storage device. In the case that the first refrigerant pressure is less than the preset refrigerant pressure, that is, the operation frequency of the compressor is less than the preset frequency, the operation load of the heat exchange system is low load, and it is required to increase the refrigerant storage in the storage device.

[0074] Optionally, the operation parameter of the heat exchange system further comprises a third refrigerant pressure of the refrigerant between the condenser and the throttling device. In the case that the operation mode of the heat exchange system is the refrigeration operation mode, the controller acquires the third refrigerant pressure, in the case that the third refrigerant pressure is greater than or equal to the first preset pressure, the controller determines that the target opening degree of the self-excited expansion valve is the third opening degree; in the case that the third refrigerant pressure is less than the first preset pressure, the controller determines that the target opening degree of the self-excited expansion valve is the fourth opening degree; wherein the third opening degree is greater than the fourth opening degree.

[0075] S023, the controller determines the target pressure difference between the two ends of the self-excited expansion valve corresponding to the target opening degree of the self-excited expansion valve.

[0076] Wherein, the target pressure difference is the difference between the target refrigerant pressure of the storage device and the first refrigerant pressure.

[0077] Exemplarily, in the case that the target opening degree of the self-excited expansion valve is the first opening degree, the controller determines that the target pressure difference corresponding to the first opening degree is the first pressure difference.

[0078] In the case that the target opening degree of the self-excited expansion valve is the second opening degree, the controller determines that the target pressure difference corresponding to the second opening degree is the second pressure difference.

[0079] Further, the target opening degree of the self-excited expansion valve is proportional to the target pressure difference between the two ends of the self-excited expansion valve corresponding to the target opening degree. In the case that the target pressure difference between the two ends of the self-excited expansion valve increases, the target opening degree of the self-excited expansion valve increases, and in the case that the target pressure difference between the two ends of the self-excited expansion valve decreases, the target opening degree of the self-excited expansion valve decreases.

[0080] S024, the controller determines the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference.

[0081] Further, in the case that the operation mode of the heat exchange system is the heating operation mode, the controller determines the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference.

[0082] In the case that the target pressure difference is the first pressure difference, the controller determines the target refrigerant pressure as the first target refrigerant pressure according to the first refrigerant pressure and the first pressure difference.

[0083] In a case where the target pressure difference is the second pressure difference, the controller determines the target refrigerant pressure as a second target refrigerant pressure according to the first refrigerant pressure and the second pressure difference. The first target refrigerant pressure is less than the second target refrigerant pressure.

[0084] S025, the controller controls the opening degree of the electromagnetic valve according to the target refrigerant pressure and the second refrigerant pressure.

[0085] In this embodiment, the target refrigerant pressure of the liquid storage device is the refrigerant pressure in the liquid storage device when the self-excited expansion valve is opened to the target opening degree, and the second refrigerant pressure is the current refrigerant pressure of the liquid storage device. The controller can adjust the pressure of the refrigerant in the liquid storage device by adjusting the opening degree of the electromagnetic valve, so that the second refrigerant pressure is the target refrigerant pressure and the self-excited expansion valve is opened to the target opening degree.

[0086] Figure 3 is a flowchart of another control method for a heat exchange system provided by the embodiments of the present disclosure. The control method for the heat exchange system can be executed in a controller of the heat exchange system.

[0087] S031, the controller obtains the operating parameters of the heat exchange system.

[0088] Exemplarily, the operating parameters of the heat exchange system further include a first refrigerant pressure of the refrigerant between the evaporator and the throttling device and a second refrigerant pressure in the liquid storage device.

[0089] S032, the controller obtains a target opening degree of the self-excited expansion valve.

[0090] In a case where the first refrigerant pressure is greater than or equal to a preset pressure, the controller determines the target opening degree of the self-excited expansion valve as a first opening degree; in a case where the first refrigerant pressure is less than the preset pressure, the controller determines the target opening degree of the self-excited expansion valve as a second opening degree; wherein the first opening degree is less than the second opening degree.

[0091] S033, the controller determines a target pressure difference corresponding to the target opening degree of the self-excited expansion valve.

[0092] The target pressure difference is the difference between the target refrigerant pressure of the liquid storage device and the first refrigerant pressure.

[0093] Exemplarily, in a case where the target opening degree of the self-excited expansion valve is the first opening degree, the controller determines that the target pressure difference corresponding to the first opening degree is a first pressure difference.

[0094] In a case where the target opening degree of the self-excited expansion valve is the second opening degree, the controller determines that the target pressure difference corresponding to the second opening degree is a second pressure difference.

[0095] S034, the controller determines the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference.

[0096] In the case where the target pressure difference is the first pressure difference, the controller determines the target refrigerant pressure as the first target refrigerant pressure according to the first refrigerant pressure and the first pressure difference.

[0097] In the case where the target pressure difference is the second pressure difference, the controller determines the target refrigerant pressure as the second target refrigerant pressure according to the first refrigerant pressure and the second pressure difference. The first target refrigerant pressure is less than the second target refrigerant pressure.

[0098] S035, in the case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is greater than the first target refrigerant pressure, the controller controls the electromagnetic valve to open to the third opening degree.

[0099] In the case where the target refrigerant pressure is the first target refrigerant pressure in the embodiment, that is, the target pressure difference is the first pressure difference, the opening degree of the self-excited expansion valve is the first opening degree, and the first refrigerant pressure is greater than or equal to the preset pressure. At this time, the heat exchange system is in high load operation, and it is necessary to reduce the refrigerant storage in the liquid storage device to increase the amount of refrigerant participating in the heat exchange cycle. In the case where the second refrigerant pressure is greater than the first target refrigerant pressure, it means that the refrigerant pressure in the liquid storage device is greater than the target refrigerant pressure. At this time, the controller controls the electromagnetic valve to open to the third opening degree, so that the refrigerant in the liquid storage device flows into the heat exchange circuit between the throttling device and the condenser through the first end of the refrigerant adjusting branch, to increase the refrigerant participating in the heat exchange circuit, and reduce the second refrigerant pressure in the liquid storage device.

[0100] S036, in the case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is equal to the first target refrigerant pressure, the controller controls the electromagnetic valve to open to the fourth opening degree.

[0101] In this embodiment, the second refrigerant pressure in the liquid storage device continues to decrease until it is equal to the first target refrigerant pressure. At this time, the self-energizing expansion valve is at the first opening degree. The first opening degree is smaller than the second opening degree, and the self-energizing expansion valve is slightly opened. The self-energizing expansion valve is equivalent to a throttling device, and can throttle the refrigerant flowing therethrough. In addition, the controller controls the electromagnetic valve to the fourth opening degree, which is smaller than the third opening degree and corresponds to the first opening degree of the self-energizing expansion valve. In this way, the pressure of the refrigerant flowing into the liquid storage device is equal to or corresponds to the pressure of the refrigerant flowing out of the liquid storage device, so that the opening degree of the self-energizing expansion valve is maintained at the first opening degree. In this way, the refrigerant flowing into the liquid storage device from the second end of the refrigerant regulating branch can become a gas-liquid two-phase refrigerant flowing into the liquid storage device through the self-energizing expansion valve, and the liquid refrigerant in the liquid storage device can flow out of the liquid storage device through the electromagnetic valve and the first end of the refrigerant regulating branch to flow into the heat exchange circuit. In this way, the amount of liquid refrigerant in the liquid storage device is reduced, and the amount of refrigerant participating in the heat exchange cycle is increased.

[0102] S037, in the case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is smaller than the first target refrigerant pressure, the controller controls the electromagnetic valve to open to the fifth opening degree.

[0103] In this embodiment, in the case where the second refrigerant pressure is smaller than the first target refrigerant pressure, the controller controls the electromagnetic valve to open to the fifth opening degree, which is smaller than the fourth opening degree, to reduce the refrigerant flowing out of the liquid storage device through the first end of the refrigerant regulating branch, thereby increasing the refrigerant pressure in the liquid storage device, making the second refrigerant equal to the first target refrigerant pressure, and maintaining the self-energizing expansion valve at the first opening degree.

[0104] Figure 4 FIG. 3 is a flow diagram of another control method for a heat exchange system provided by the present disclosure. The control method for the heat exchange system can be executed in a controller of the heat exchange system.

[0105] S041, the controller acquires an operating parameter of the heat exchange system.

[0106] S042, the controller obtains a target opening degree of the self-energizing expansion valve.

[0107] S043, the controller determines a target pressure difference corresponding to the target opening degree of the self-energizing expansion valve.

[0108] The target pressure difference is the difference between the target refrigerant pressure of the liquid storage device and the first refrigerant pressure.

[0109] S044, the controller determines the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference.

[0110] S045, when the target refrigerant pressure is the second target refrigerant pressure, the controller controls the electromagnetic valve to open.

[0111] In this embodiment, when the target refrigerant pressure is the second target refrigerant pressure, that is, the target pressure difference is the second pressure difference, and the opening degree of the self-excited expansion valve is the second opening degree, the first refrigerant pressure is less than the preset pressure. At this time, the operating load of the heat exchange system is a low load, and it is necessary to increase the refrigerant storage capacity of the liquid storage device and reduce the amount of refrigerant participating in the heat exchange cycle. The opening degree of the self-excited expansion valve is the second opening degree, which is greater than the first opening degree. In this way, the high-pressure liquid refrigerant flowing out of the evaporator can flow into the liquid storage device through the second end of the refrigerant adjusting branch and the self-excited expansion valve, so as to increase the refrigerant in the liquid storage device.

[0112] Moreover, the controller controls the electromagnetic valve to open, and the opening degree of the electromagnetic valve can be the maximum opening degree. In this way, the refrigerant pressure in the liquid storage device can be the same as the refrigerant pressure of the heat exchange circuit between the throttling device and the condenser, so as to increase the pressure difference between the second refrigerant pressure and the second refrigerant pressure, so that the pressure difference is the second pressure difference, so that the opening degree of the self-excited expansion valve is the second opening degree. The second pressure difference is greater than the first pressure difference, and the second opening degree is greater than the first opening degree.

[0113] S046, when the second refrigerant pressure is greater than the second target refrigerant pressure, and the pressure difference between the second refrigerant pressure and the second target refrigerant pressure is greater than the preset pressure difference, the controller controls the electromagnetic valve to close.

[0114] In this embodiment, the electromagnetic valve is opened, and the high-pressure liquid refrigerant flowing out of the evaporator continuously supplements the liquid refrigerant into the liquid storage device through the self-excited expansion valve and the second end of the refrigerant adjusting branch. The gaseous refrigerant in the liquid storage device flows out of the liquid storage device through the first end of the refrigerant adjusting branch. With the inflow of high-pressure liquid refrigerant, the refrigerant pressure in the liquid storage device gradually increases. When the second refrigerant pressure is greater than the second target refrigerant pressure, and the pressure difference between the second refrigerant pressure and the second target refrigerant pressure is greater than the preset pressure difference, the controller controls the electromagnetic valve to close. After the electromagnetic valve is closed, when the difference between the second refrigerant pressure and the first refrigerant pressure is greater than the opening pressure difference of the self-excited expansion valve, the liquid refrigerant can continue to flow into the liquid storage device through the self-excited expansion valve and the second end of the refrigerant adjusting branch. With the increase of the second refrigerant pressure in the liquid storage device, when the second refrigerant pressure increases to be less than or equal to the opening pressure difference of the self-excited expansion valve, the self-excited expansion valve is closed, and the liquid storage device can store liquid refrigerant.

[0115] Moreover, when the pressure difference between the second refrigerant pressure and the second target refrigerant pressure is greater than the preset pressure difference, the controller controls the electromagnetic valve to close. In this way, it can also reduce the situation that the liquid refrigerant flowing out of the evaporator directly flows into the condenser through the refrigerant adjusting branch, and improve the heat exchange efficiency of the heat exchange system.

[0116] In some optional embodiments, when the operation mode of the heat exchange system is the cooling operation mode, the controller determines the opening pressure difference of the self-lubricating expansion valve as a third pressure difference. When the operation mode of the heat exchange system is the heating operation mode, the controller determines the opening pressure difference of the self-lubricating expansion valve as a fourth pressure difference. The third pressure difference is greater than the fourth pressure difference.

[0117] The flow direction of the refrigerant is different when the heat exchange system is in the cooling operation or the heating operation, and the direction of the refrigerant flowing into or flowing out of the liquid storage device is also different. In this embodiment, the controller determines different opening pressure differences of the self-lubricating expansion valve to adapt to the refrigerant adjustment requirements of the heat exchange system in different operation modes.

[0118] Optionally, when the operation mode of the heat exchange system is the cooling operation mode, the controller determines the opening degree of the electromagnetic valve according to the third refrigerant pressure.

[0119] When the operation mode of the heat exchange system is the cooling operation mode, and the third refrigerant pressure is less than the cooling preset pressure, the controller controls the electromagnetic valve to open to a seventh opening degree.

[0120] In this embodiment, when the operation mode of the heat exchange system is the cooling operation mode, the refrigerant flows through the compressor, the condenser, the throttling device, and the evaporator in sequence. When the third refrigerant pressure is less than the cooling preset pressure, the heat exchange system is in a low load operation, and it is necessary to increase the refrigerant storage capacity of the liquid storage device. At this time, the controller controls the electromagnetic valve to open to the seventh opening degree, and the high-pressure refrigerant flowing out of the condenser can flow into the liquid storage device through the first end of the refrigerant adjustment branch to increase the refrigerant storage capacity of the liquid storage device. Optionally, the seventh opening degree is greater than 90% of the maximum opening degree of the electromagnetic valve. Moreover, the opening pressure difference of the self-lubricating expansion valve in the cooling operation is greater than the opening pressure difference of the self-lubricating expansion valve in the heating operation, so that the opening pressure difference of the self-lubricating expansion valve is greater than the difference between the first refrigerant pressure and the third refrigerant pressure (the refrigerant pressure in the liquid storage device is equal to the third refrigerant pressure when the electromagnetic valve is at the seventh opening degree) of the heat exchange system in the heating operation. At this time, the self-lubricating expansion valve is closed.

[0121] When the operation mode of the heat exchange system is the cooling operation mode, and the third refrigerant pressure is greater than or equal to the cooling preset pressure, the controller controls the electromagnetic valve to open to a sixth opening degree.

[0122] In the embodiment, when the third refrigerant pressure is greater than or equal to the preset refrigeration pressure, that is, the heat exchange system is in high load operation. At this time, it is necessary to reduce the refrigerant storage in the liquid storage device. The controller controls the electromagnetic valve to open to the sixth opening degree. At this time, the electromagnetic valve is equivalent to a throttling device, and the electromagnetic valve can throttle the refrigerant flowing through the first end of the refrigerant adjusting branch, so that the refrigerant flowing into the liquid storage device is gas-liquid two-phase refrigerant to increase the second refrigerant pressure in the liquid storage device. When the difference between the second refrigerant pressure and the first refrigerant pressure is greater than the pressure difference of the self-excited expansion valve, the self-excited expansion valve is opened, and the liquid refrigerant in the liquid storage device can flow out of the liquid storage device through the self-excited expansion valve, so as to reduce the refrigerant storage of the liquid storage device.

[0123] In combination Figure 7 As shown in the figure, the embodiment of the present disclosure provides a control device for a heat exchange system, which comprises a processor 100 and a memory 101. Optionally, the control device can also comprise a communication interface 102 and a bus 103. Wherein, the processor 100, the communication interface 102 and the memory 101 can complete the communication among each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call the logical instructions in the memory 101 to execute the control method for the heat exchange system in the above-mentioned embodiment.

[0124] In addition, when the logical instructions in the memory 101 described above are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer readable storage medium.

[0125] The memory 101 as a kind of computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 100 executes the program instructions / modules stored in the memory 101, thereby executing function application and data processing, that is, realizing the control method for the heat exchange system in the above-mentioned embodiment.

[0126] The memory 101 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required by a function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 101 can include a high-speed random access memory, and can also include a non-volatile memory.

[0127] The heat exchange system provided by the embodiments of the present disclosure further comprises a heat exchange system body and the control device for the heat exchange system described above. The control device for the heat exchange system is installed on the heat exchange system body. The installation relationship described herein is not limited to placing in the product, but also includes installation connection with other components of the product, including but not limited to physical connection, electrical connection or signal transmission connection, etc. Those skilled in the art can understand that the control device for the heat exchange system can be adapted to the feasible heat exchange system body, and thus realize other feasible embodiments.

[0128] The embodiments of the present disclosure provide a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are configured to execute the control method for the heat exchange system.

[0129] The computer readable storage medium described above can be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

[0130] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes, or can be a transitory storage medium.

[0131] 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.

[0132] 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.

[0133] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.), can be implemented in other manners. For example, the described apparatus embodiments can be implemented only in a form of a logical function, and can be implemented by using a manner such as software (for example, application program) or the like. In some embodiments, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or indirect coupling between different units, or the coupling or direct coupling or indirect coupling between the displayed or discussed communication connections can be in a form of electrical, mechanical or other forms.

[0134] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions and operations of the system, method and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks can occur in an order different from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in an order different from that disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for a heat exchange system, characterized by, The heat exchange system comprises a heat exchange circuit and a refrigerant regulating branch. The heat exchange circuit comprises a compressor, a condenser, a throttling device and an evaporator connected in sequence. The refrigerant regulating branch is connected with the heat exchange circuit between the condenser and the throttling device at a first end, and connected with the heat exchange circuit between the throttling device and the evaporator at a second end. The refrigerant regulating branch comprises an electromagnetic valve, a liquid storage device and a self-excited expansion valve connected in sequence. The electromagnetic valve is arranged at the first end of the refrigerant regulating branch and connected with a first port of the liquid storage device. The self-excited expansion valve is arranged at the second end of the refrigerant regulating branch and connected with a second port of the liquid storage device. The opening degree of the self-excited expansion valve is related to the pressure difference between the two ends of the self-excited expansion valve. The control method comprises: obtaining the operating parameters of the heat exchange system; adjusting the refrigerant storage capacity of the refrigerant regulating branch according to the operating parameters of the heat exchange system; wherein the operating parameters of the heat exchange system comprise a first refrigerant pressure of the refrigerant between the evaporator and the throttling device and a second refrigerant pressure in the liquid storage device; adjusting the refrigerant storage capacity of the refrigerant regulating branch according to the operating parameters of the heat exchange system comprises: obtaining a target opening degree of the self-excited expansion valve; determining a target pressure difference between the two ends of the self-excited expansion valve corresponding to the target opening degree of the self-excited expansion valve; wherein the target pressure difference is the difference between the target refrigerant pressure of the liquid storage device and the first refrigerant pressure; determining the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference; controlling the opening degree of the electromagnetic valve according to the target refrigerant pressure and the second refrigerant pressure.

2. The control method according to claim 1, characterized by, The operating parameters of the heat exchange system comprise the operating load of the heat exchange system; adjusting the refrigerant storage capacity of the refrigerant regulating branch according to the operating parameters of the heat exchange system further comprises: in the case of high load operation of the operating load of the heat exchange system, reducing the refrigerant storage capacity of the refrigerant regulating branch; in the case of low load operation of the operating load of the heat exchange system, increasing the refrigerant storage capacity of the refrigerant regulating branch.

3. The control method according to claim 1, characterized by, determining the target refrigerant pressure according to the first refrigerant pressure and the target pressure difference comprises: in the case that the first refrigerant pressure is greater than or equal to a preset pressure, determining the target opening degree of the self-excited expansion valve as a first opening degree; determining the target pressure difference corresponding to the first opening degree as a first pressure difference; determining the target refrigerant pressure as a first target refrigerant pressure according to the first refrigerant pressure and the first pressure difference; and / or, in the case that the first refrigerant pressure is less than the preset pressure, determining the target opening degree of the self-excited expansion valve as a second opening degree; determining the target pressure difference corresponding to the second opening degree as a second pressure difference; determining the target refrigerant pressure as a second target refrigerant pressure according to the first refrigerant pressure and the second pressure difference; wherein the first opening degree is less than the second opening degree, and the first target refrigerant pressure is less than the second target refrigerant pressure.

4. The control method according to claim 3, characterized by controlling the opening degree of the electromagnetic valve according to the target refrigerant pressure and the second refrigerant pressure comprises: in the case that the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is greater than the first target refrigerant pressure, controlling the electromagnetic valve to open to a third opening degree; in the case that the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is equal to the first target refrigerant pressure, controlling the electromagnetic valve to open to a fourth opening degree; In a case where the target refrigerant pressure is the first target refrigerant pressure and the second refrigerant pressure is less than the first target refrigerant pressure, the solenoid valve is controlled to open to a fifth opening degree; The third opening degree is greater than the fourth opening degree, and the fourth opening degree is greater than the fifth opening degree.

5. The control method according to claim 3, characterized by, The control method further includes: In a case where the target refrigerant pressure is the second target refrigerant pressure, the solenoid valve is controlled to open; In a case where the second refrigerant pressure is greater than the second target refrigerant pressure and a pressure difference between the second refrigerant pressure and the second target refrigerant pressure is greater than a preset pressure difference, the solenoid valve is controlled to close.

6. The control method of any one of claims 1 to 5, wherein In a case where the operation mode of the heat exchange system is the refrigeration operation mode, the opening pressure difference of the self-excited expansion valve is determined as a third pressure difference; In a case where the operation mode of the heat exchange system is the heating operation mode, the opening pressure difference of the self-excited expansion valve is determined as a fourth pressure difference; The third pressure difference is greater than the fourth pressure difference.

7. A control device for a heat exchange system, comprising a processor and a memory having stored program instructions, wherein, The processor is configured to execute the program instructions to implement the control method for the heat exchange system according to any one of claims 1 to 6.

8. A heat exchange system, characterized by, The heat exchange system comprises: a heat exchange circuit comprising, in sequence, a compressor, a condenser, a throttling device, and an evaporator; a refrigerant adjusting branch, a first end of the refrigerant adjusting branch being connected to the heat exchange circuit between the condenser and the throttling device, and a second end of the refrigerant adjusting branch being connected to the heat exchange circuit between the throttling device and the evaporator; The control device for the heat exchange system according to claim 7.

9. The heat exchange system of claim 8, wherein, The refrigerant adjusting branch comprises: a liquid storage device; a solenoid valve arranged at the first end of the refrigerant adjusting branch, the solenoid valve being connected to a first port of the liquid storage device; a self-excited expansion valve arranged at the second end of the refrigerant adjusting branch, the self-excited expansion valve being connected to a second port of the liquid storage device, and an opening degree of the self-excited expansion valve being related to a pressure difference between two ends of the self-excited expansion valve.

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