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

Abstract

The invention 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 loop and a refrigerant adjusting branch, the heat exchange loop comprises a compressor, an outdoor heat exchanger, a throttler and an indoor heat exchanger which are sequentially connected, the liquid storage end of the refrigerant adjusting branch is connected with the heat exchange loop located between the outdoor heat exchanger and the throttler, and the liquid discharge end of the refrigerant adjusting branch is connected with an air return opening of the compressor; the control method comprises the steps that the compressor exhaust port pressure and the operation mode of the heat exchange system are obtained; and the refrigerant storage amount of the refrigerant adjusting branch is adjusted according to the pressure of the exhaust port of the compressor and the operation mode of the heat exchange system. According to the embodiment, the refrigerant storage amount of the refrigerant adjusting branch can be adjusted, namely, the amount of the refrigerant participating in heat exchange circulation in the heat exchange loop can be adjusted, so that the refrigerant filling reasonability 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 Art

[0002] The refrigerant in the air conditioning system circulates in the system to achieve cooling or heating operation mode. When the air conditioner is running in cooling mode with different loads or heating mode with different loads, the optimal refrigerant circulation volume required by the heat exchange system is different, but for the heat exchange system, the refrigerant filling volume is fixed. When the outside temperature of the cooling system is high or the outside temperature of the heating system is low, the rated refrigerant volume may cause the air conditioning system to overload, resulting in poor cooling or heating effects; and when the outside temperature of the cooling system is low or the outside temperature of the heating system is high, the air conditioning system is running at low load, and the amount of refrigerant may be in a surplus situation. This part of the refrigerant does not play a role in heat exchange during system operation, resulting in low energy efficiency of the temperature control equipment unit, and the heat exchange system cannot perform at its best. The heat exchange effect of the heat exchange system is poor.

[0003] In the related art, the refrigerant in the heat exchange system is generally regulated by adjusting the opening of the throttle to reduce the pressure, cool down or increase the pressure and heat the refrigerant, so that the refrigerant state meets the needs of the indoor heat exchanger and puts the heat exchange system in a relatively good state.

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

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

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a control method and device 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 the present application, a control method for a heat exchange system is provided, wherein the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch, wherein the heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence, the liquid storage end of the refrigerant regulating branch is connected to the heat exchange circuit located between the outdoor heat exchanger and the throttle, and the liquid discharge end of the refrigerant regulating branch is connected to the return air port of the compressor; the control method includes: obtaining the compressor exhaust pressure and the operating mode of the heat exchange system; and adjusting the refrigerant storage capacity of the refrigerant regulating branch according to the compressor exhaust pressure and the operating mode of the heat exchange system.

[0010] In some optional embodiments, adjusting the refrigerant storage amount of the refrigerant regulating branch according to the compressor exhaust pressure and the operation mode of the heat exchange system includes:

[0011] When the pressure at the compressor exhaust port is less than or equal to the preset pressure and the heat exchange system is in heating mode, the refrigerant storage amount of the refrigerant regulating branch is adjusted to a first preset refrigerant amount;

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

[0013] In some optional embodiments, when the compressor exhaust pressure is less than or equal to the preset pressure and the heat exchange system is in cooling mode, the refrigerant storage amount of the refrigerant regulating branch is adjusted to a third preset refrigerant amount;

[0014] When the pressure at the compressor exhaust port is greater than the preset pressure and the heat exchange system is in cooling mode, adjusting the refrigerant storage amount of the refrigerant regulating branch to a 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, wherein the liquid storage solenoid valve is arranged at the liquid storage end of the refrigerant regulating branch, the liquid storage solenoid valve is connected to the liquid storage port of the liquid storage device, and the liquid discharge solenoid valve is arranged at the liquid discharge end of the refrigerant regulating branch, and the liquid discharge solenoid valve is connected to the liquid discharge port of the liquid storage device; adjusting the refrigerant storage amount of the refrigerant regulating branch to a third preset refrigerant amount includes: controlling the throttle to a working throttling state, controlling the liquid storage solenoid valve to open to a third opening, and controlling the liquid discharge solenoid valve to open to a fourth opening; wherein the third opening is greater than the fourth opening; and / or,

[0017] Adjusting the refrigerant storage amount of the refrigerant regulating branch to a fourth preset refrigerant amount includes: controlling the throttle to be in a working throttling state, controlling the liquid storage solenoid valve to be closed, and controlling the liquid discharge solenoid valve to be opened.

[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, wherein the liquid storage solenoid valve is arranged at the liquid storage end of the refrigerant regulating branch, the liquid storage solenoid valve is connected to the liquid storage port of the liquid storage device, and the liquid discharge solenoid valve is arranged at the liquid discharge end of the refrigerant regulating branch, and the liquid discharge solenoid valve is connected to the liquid discharge port of the liquid storage device; regulating the refrigerant storage amount of the refrigerant regulating branch includes: after controlling the throttle to be in a first throttling state of full open without throttling, determining the refrigerant temperature difference between the first refrigerant temperature and the second refrigerant temperature; 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; and controlling the operating states of the liquid storage solenoid valve and the liquid discharge solenoid valve according to the refrigerant temperature difference.

[0019] In some optional embodiments, the operating states of the liquid storage solenoid valve and the liquid discharge solenoid valve are controlled according to the refrigerant temperature difference, including: when the refrigerant temperature difference is less than or equal to the preset temperature difference, the liquid storage solenoid valve is controlled to open to a first opening degree and maintained for a first preset time, and the liquid discharge solenoid valve is controlled to open to a second opening degree and maintained for a second preset time; wherein the first opening degree is greater than the second opening degree, and the first preset time is greater than or equal to the second preset time.

[0020] In some optional embodiments, the operating states of the liquid storage solenoid valve and the liquid discharge solenoid valve are controlled according to the refrigerant temperature difference, including: when the refrigerant temperature difference is less than or equal to the preset temperature difference, obtaining a first opening adjustment value of the liquid storage solenoid valve corresponding to the refrigerant temperature difference, and a second opening adjustment value of the liquid discharge solenoid valve corresponding to the refrigerant temperature difference; adjusting the opening of the liquid storage solenoid valve according to the first opening adjustment value based on the current opening value of the liquid storage solenoid valve; adjusting the opening of the liquid discharge solenoid valve according to the second opening adjustment value based on the current opening value of the liquid discharge solenoid valve.

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

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

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

[0024] In some optional embodiments, regulating the refrigerant reserves of the refrigerant regulating branch also includes: obtaining the refrigerant amount in the liquid storage device; when the refrigerant amount in the liquid storage device is less than the first preset refrigerant amount, controlling the throttle to be in a second throttling state of working throttling; after controlling the throttle to maintain the second throttling state for a fourth preset time period, controlling the throttle to be in a first throttling state of fully open without throttling.

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

[0026] According to an embodiment of the second aspect of the present application, a control device for a heat exchange system is provided, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute a control method for a heat exchange system as described in any one of the foregoing descriptions when running the program instructions.

[0027] According to an embodiment of the third aspect of the present application, a heat exchange system is provided, comprising: a heat exchange circuit, comprising a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence; a refrigerant regulating branch, comprising a liquid storage end and a liquid discharge end, the liquid storage end is connected to the heat exchange circuit located between the outdoor heat exchanger and the throttle, and the liquid discharge end is connected to the return air 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, which is arranged 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, which is arranged 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 device for a heat exchange system and the heat exchange system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0030] The heat exchange system includes a heat exchange circuit and a refrigerant regulating branch. The refrigerant regulating branch includes a liquid storage end and a liquid discharge end, and the liquid storage end of the refrigerant regulating branch is connected to the heat exchange circuit located between the outdoor heat exchanger and the throttle. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch through the liquid storage end of the refrigerant regulating branch to store the refrigerant in the refrigerant regulating branch, thereby reducing the amount of refrigerant participating in the heat exchange cycle. Similarly, the liquid discharge end of the refrigerant regulating branch is connected to the return air port of the compressor, and the refrigerant in the refrigerant regulating branch can flow back into the heat exchange system through the liquid discharge end of the refrigerant regulating branch to increase the amount of refrigerant participating in the heat exchange system. The controller can obtain the compressor exhaust pressure and the operating mode of the heat exchange system, and according to the compressor exhaust pressure and the operating mode of the heat exchange system, the controller can adjust the refrigerant storage of the refrigerant regulating branch, that is, the controller can adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit, thereby improving the rationality of refrigerant filling of the heat exchange system under different working conditions and improving the performance of the heat exchange system.

[0031] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0033] Figure 1 is a flow chart of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0034] Figure 2 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0035] Figure 3 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0036] Figure 4 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0037] Figure 5 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0038] Figure 6 It is a structural schematic diagram of a control device for a heat exchange system provided in an embodiment of the present disclosure.

[0039] Reference numerals:

[0040] 100, processor; 101, memory; 102, communication interface; 103, bus; 200, outdoor heat exchanger; 300, throttle; 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 separation device; 700, compressor; 710, first pipeline; 720, second pipeline. DETAILED DESCRIPTION

[0041] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0042] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0044] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" 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, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0045] The term "and / or" is a description of the association relationship 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, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0047] like Figure 4 and Figure 5 As shown, the embodiment of the present 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 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 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 air port of the compressor 700.

[0048] In this embodiment, the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch 500. The refrigerant regulating branch 500 includes a liquid storage end and a liquid discharge end, and 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 300. In this way, the refrigerant in the heat exchange system can enter the refrigerant regulating branch 500 through the liquid storage end of the refrigerant regulating branch 500, so as to store the refrigerant in the refrigerant regulating branch 500 and reduce 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 air port of the compressor 700, and the refrigerant in the refrigerant regulating branch 500 can flow back into the heat exchange system through the liquid discharge end of the refrigerant regulating branch 500 to increase the amount of refrigerant participating in the heat exchange system. This embodiment can adjust the amount of refrigerant participating in the refrigerant circulation in the heat exchange system to improve the rationality of refrigerant filling in the heat exchange system under different working conditions and improve the performance of the heat exchange system.

[0049] Further, 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 arranged 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. The liquid discharge solenoid valve 530 is arranged 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 disposed 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. In other words, 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 between the outdoor heat exchanger 200 and the throttle 300, so that the refrigerant between the outdoor heat exchanger 200 and the throttle 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] The discharge solenoid valve 530 is arranged at the discharge end of the refrigerant regulating branch 500, and the discharge solenoid valve 530 is connected to the discharge port of the liquid storage device 510. In other words, the discharge end of the refrigerant regulating branch 500 is connected to the discharge port of the liquid storage device 510. The discharge end of the refrigerant regulating branch 500 is connected to the return air port of the compressor 700, so that the refrigerant in the liquid storage device 510 can also flow back into the compressor 700 through the discharge end of the refrigerant regulating branch 500 and the discharge solenoid valve 530, that is, flow back into the heat exchange circuit. In this embodiment, the refrigerant can be controlled to flow into the liquid storage device 510 or flow out of the liquid storage device 510 by controlling the opening and closing of the liquid storage solenoid valve 520 and the discharge solenoid valve 530, so as to adjust the amount of refrigerant participating in the heat exchange cycle, improve the rationality of the refrigerant filling of the heat exchange system under different working conditions, and improve the heat exchange performance of the heat exchange system.

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

[0053] In this embodiment, the first pipeline 710 is connected between the outdoor heat exchanger 200 and the throttle 300. When the heat exchange system is operated in the cooling mode, the refrigerant flows through the outdoor heat exchanger 200, the first pipeline 710 and the throttle 300 in sequence. The liquid storage end of the refrigerant regulating branch 500 is connected to the first position of the first pipeline 710, and the refrigerant can flow into the refrigerant regulating branch 500 through the first position of the first pipeline 710. When the refrigerant flows into the refrigerant regulating branch 500 through the first position, the refrigerant in the first pipeline 710 is reduced, and the refrigerant in the first pipeline 710 partially flashes. The ratio between the length of the pipeline between the first position and the outdoor heat exchanger 200 and the length of the first pipeline 710 is in the range of 1 / 4 to 3 / 4. In this way, the fluctuation of the refrigerant entering the throttle 300 can be reduced, the occurrence of large throttling noise caused by the throttling of the refrigerant in the throttle 300 can be reduced, and the noise of the throttle 300 when working can be reduced. Further, 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 may 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] Exemplarily, the discharge solenoid valve 530 is an electronic expansion valve. The discharge solenoid valve 530 is arranged at the discharge end of the refrigerant regulating branch 500, and the discharge end of the refrigerant regulating branch 500 is connected to the return air port of the compressor 700. The discharge solenoid valve 530 is an electronic expansion valve. In this way, not only can the refrigerant in the liquid storage device 510 be selectively transmitted to the compressor 700 by opening and closing the electronic expansion valve, but the electronic expansion valve can also throttle the refrigerant, so that the liquid refrigerant becomes a gaseous refrigerant, so as to supply it to the return air port of the compressor 700, thereby increasing the air supply of the compressor 700.

[0055] Alternatively, if Figure 5 As shown, the heat exchange system further includes a gas-liquid separation device 600 and a second pipeline 720, and the second pipeline 720 is connected between the gas-liquid separation device 600 and the return air port of the compressor 700. The discharge end of the refrigerant regulating branch 500 is connected to the second position of the second pipeline 720, and the ratio between the length of the pipeline between the second position and the return air 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 separation device 600 and the gas return port of the compressor 700, and the gas separated by the gas-liquid separation device 600 can flow into the gas return port of the compressor 700 through the second pipeline 720 to supply gas to the compressor 700. The discharge end of the refrigerant regulating branch 500 is connected to the second position of the second pipeline 720, and the refrigerant of the refrigerant regulating branch 500 can be supplied to the gas return port of the compressor 700 through the second pipeline 720. Since the electronic expansion valve is provided at the discharge end, the refrigerant regulating branch 500 can directly provide gaseous refrigerant to the second pipeline 720 to increase the gas replenishment amount of the compressor 700.

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

[0058] S001, the controller obtains the compressor exhaust pressure and the operation mode of the heat exchange system.

[0059] S002, according to the compressor exhaust pressure and the operation mode of the heat exchange system, the controller adjusts the refrigerant storage capacity of the refrigerant regulating branch.

[0060] In this embodiment, the controller can obtain the compressor exhaust pressure and the operating mode of the heat exchange system, and according to the compressor exhaust pressure and the operating mode of the heat exchange system, the controller can adjust the refrigerant storage capacity of the refrigerant regulating branch, that is, the controller can adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit, thereby improving the rationality of refrigerant filling of the heat exchange system under different working conditions and improving the performance of the heat exchange system.

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

[0062] In this embodiment, when the heat exchange system is in heating mode, when the pressure at the compressor exhaust port is less than or equal to the preset pressure, it means that the heat exchange circuit is in a low-load operation state, and the amount of refrigerant required in the heat exchange circuit is reduced. At this time, the controller can control the refrigerant storage of the refrigerant regulating branch to be the first preset refrigerant amount. When the pressure at the compressor exhaust port is greater than the preset pressure, it means that the heat exchange circuit is in a high-load operation state, and the amount of refrigerant required in the heat exchange circuit increases. At this time, the controller can control the refrigerant storage of the refrigerant regulating branch to be the second preset refrigerant amount. The first preset refrigerant amount is greater than the second preset refrigerant amount. When the heat exchange circuit is in low-load operation, the refrigerant storage of the refrigerant regulating branch is greater than the refrigerant storage of the refrigerant regulating branch when the heat exchange circuit is in high-load operation. In this way, when the heat exchange circuit is in heating mode, the amount of refrigerant participating in the heat exchange cycle when the heat exchange circuit is in low-load operation is less than the amount of refrigerant participating in the heat exchange cycle when the heat exchange circuit is in high-load operation. Therefore, the amount of refrigerant participating in the heat exchange cycle can be adjusted under different working conditions of the heat exchange circuit, and the rationality of the amount of refrigerant participating in the heat exchange cycle is improved.

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

[0064] In this embodiment, when the heat exchange system is in the cooling mode, when the pressure at the compressor exhaust port is less than or equal to the preset pressure, it means that the heat exchange circuit is in a low-load operation state, and the amount of refrigerant required in the heat exchange circuit is reduced. At this time, the controller controls the refrigerant storage of the refrigerant regulating branch to be the third preset refrigerant amount. When the pressure at the compressor exhaust port is greater than the preset pressure, it means that the heat exchange circuit is in a high-load operation state, and the amount of refrigerant required in the heat exchange circuit increases. At this time, the controller controls the refrigerant storage of the refrigerant regulating branch to be the fourth preset refrigerant amount. The third preset refrigerant amount is greater than the fourth preset refrigerant amount. When the heat exchange circuit is in low-load operation, the refrigerant storage of the refrigerant regulating branch is greater than the refrigerant storage participating in the heat exchange cycle when the heat exchange circuit is in high-load operation. In this way, in the heating mode, the amount of refrigerant participating in the heat exchange cycle when the heat exchange circuit is in low-load operation is less than the amount of refrigerant participating in the heat exchange cycle when the heat exchange circuit is in high-load operation. Therefore, the amount of refrigerant participating in the heat exchange cycle can be adjusted under different working conditions of the heat exchange circuit, and the rationality of the amount of refrigerant participating in the heat exchange cycle is improved.

[0065] Optionally, adjusting the refrigerant storage amount of the refrigerant regulating branch to a third preset refrigerant amount includes:

[0066] The controller controls the throttle to be in a working throttling state, the controller controls the liquid storage solenoid valve to open to a third opening, and the controller controls the liquid discharge solenoid valve to open to a fourth opening, wherein the third opening is greater than the fourth opening.

[0067] When the refrigerant storage capacity of the refrigerant regulating branch is adjusted to the third preset refrigerant capacity, the heat exchange system is in the cooling mode. At this time, the refrigerant flowing through the liquid storage end of the refrigerant regulating branch is the high-pressure refrigerant flowing out of the outdoor heat exchanger (equivalent to the condenser), and the throttle can work normally for throttling. 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, and the third opening degree is 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 gas refrigerant in the liquid storage device can flow out of the liquid storage device through the liquid discharge solenoid valve to reduce the pressure in the liquid storage device and increase the refrigerant storage capacity of the liquid storage device.

[0068] Optionally, adjusting the refrigerant storage amount of the refrigerant regulating branch to a fourth preset refrigerant amount includes:

[0069] The controller controls the throttle to be in a working throttling state, the controller controls the liquid storage solenoid valve to be closed, and the controller controls the liquid discharge solenoid valve to be opened.

[0070] When the refrigerant storage capacity of the refrigerant regulating branch is adjusted to the fourth preset refrigerant capacity, the heat exchange system is in the cooling mode. At this time, the refrigerant flowing through the liquid storage end of the refrigerant regulating branch is the high-pressure refrigerant flowing out of the outdoor heat exchanger (equivalent to the condenser), and the throttle can work normally to throttle, thereby improving the operational stability and reliability of the heat exchange system. When the refrigerant storage capacity of the refrigerant regulating branch is the fourth preset refrigerant capacity, the fourth preset refrigerant capacity is less than the third preset refrigerant capacity, and the refrigerant storage capacity of the liquid storage device can be reduced. The controller controls the liquid storage solenoid valve to close to reduce the refrigerant in the heat exchange circuit from flowing into the liquid storage device and increasing the refrigerant storage capacity of the liquid storage device. The controller also controls the liquid discharge solenoid valve to open, so that the refrigerant in the liquid storage device can flow out through the liquid discharge solenoid valve, thereby reducing the refrigerant storage capacity in the liquid storage device and making the refrigerant capacity in the liquid storage device the fourth preset refrigerant capacity.

[0071] Figure 2 It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

[0072] S011, the controller obtains the compressor exhaust pressure and the operation mode of the heat exchange system.

[0073] S012, after the controller controls the throttle to be in a first throttling state of fully open without throttling, the controller determines a 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 passing through the throttle, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the throttle.

[0075] S013, the controller controls the operating states 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 two modes: cooling and heating. In cooling mode, the refrigerant in the heat exchange loop flows through the compressor, outdoor heat exchanger, throttle and indoor heat exchanger in sequence, and then flows back to the compressor to complete a cooling cycle. In heating mode, the refrigerant in the heat exchange loop flows through the compressor, indoor heat exchanger, throttle and outdoor heat exchanger in sequence, and then flows back to the compressor to complete a heating cycle.

[0077] The liquid storage end of the refrigerant regulating branch is connected to the heat exchange circuit between the outdoor heat exchanger and the throttle. Exemplarily, when the operation mode of the heat exchange system is the heating mode, after the controller controls the throttle to be in the first throttling state of full opening without throttling, the controller determines the refrigerant temperature difference between the first refrigerant temperature and the second refrigerant temperature. The controller controls the liquid storage solenoid valve and the liquid discharge solenoid valve according to the refrigerant temperature difference, so that the liquid storage solenoid valve and the liquid discharge solenoid valve are opened or closed, thereby adjusting the refrigerant storage in the liquid storage device. In the heating mode, the throttle is in the first throttling state of full opening without throttling, which can make the refrigerant state before and after the throttle the same. In this way, the state of the refrigerant entering the refrigerant regulating branch is the same in both the heating and cooling operation modes of the heat exchange system, which can reduce the refrigerant becoming a two-phase refrigerant after throttling by the throttle, resulting in more gaseous refrigerant flowing into the refrigerant regulating branch, and increasing the error of the refrigerant storage in the liquid storage device. Thereby, the accuracy of storing the refrigerant in the liquid storage device and the accuracy of adjusting the amount of the refrigerant participating in the heat exchange cycle are improved, so as to improve the performance of the heat exchange system.

[0078] Figure 3 It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

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

[0080] S022, after the controller controls the throttle to be in a first throttling state of fully open without throttling, the controller determines a 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 passing through the throttle, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the throttle.

[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 a first opening degree and maintain it for a first preset time, and the controller also controls the liquid discharge solenoid valve to open to a second opening degree and maintain it for a second preset time.

[0083] The first opening degree is greater than the second opening degree, and / or the first preset time length is greater than or equal to the second preset time length.

[0084] It takes a certain amount of time for the throttle to change from a working throttling state to a fully open non-throttling state. When the temperature difference between the first refrigerant temperature and the second refrigerant temperature before and after the throttle is less than or equal to the preset temperature difference, it means that the throttle is in the first throttling state of fully open non-throttling, and the state of the refrigerant flowing through the throttle is basically the same as the state of the refrigerant flowing out of the indoor heat exchanger. At this time, the controller controls the liquid storage solenoid valve to open to the first opening, and the liquid discharge solenoid valve to open to the second opening, and the first opening is greater than the second opening, so that the refrigerant can flow into the liquid storage device through the liquid storage solenoid valve, and the gas refrigerant in the liquid storage device can flow out of the liquid storage device through the liquid discharge solenoid valve, so as to reduce the pressure in the liquid storage device and increase the refrigerant storage capacity of the liquid storage device. For example, when the pressure at the compressor exhaust port is less than or equal to the preset pressure, the refrigerant storage capacity of the liquid storage device can be increased to the first preset refrigerant capacity.

[0085] The liquid storage solenoid valve is opened for a first preset time, and the liquid discharge solenoid valve is opened for a second preset time, and the first preset time is greater than or equal to the second preset time. When the liquid discharge solenoid valve is just closed, the pressure in the liquid storage device is relatively low, and refrigerant can still be supplied to the liquid storage device through the liquid storage solenoid valve, so that the refrigerant storage capacity in the liquid storage device can be continuously increased when the liquid storage solenoid valve is opened, 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 a first opening adjustment value of the liquid storage solenoid valve corresponding to the refrigerant temperature difference, and a 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 the preset temperature difference, the liquid storage solenoid valve is controlled to open to the first opening. Within the first preset time, when the throttle does not reach the fully open state, it can continue to open or when the refrigerant temperature difference changes due to other factors, the controller can adjust the first opening of the liquid storage solenoid valve according to the first opening adjustment value corresponding to the refrigerant temperature difference, and adjust the second opening of the liquid discharge solenoid valve according to the second opening adjustment value corresponding to the refrigerant temperature difference, so as to improve the liquid storage efficiency of the liquid storage device.

[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] When the refrigerant temperature difference is greater, the content of gaseous refrigerant in the refrigerant flowing through the throttle is greater, and when the refrigerant temperature difference is smaller, the content of gaseous refrigerant in the refrigerant flowing through the throttle is less. When the content of gaseous refrigerant in the refrigerant flowing through the throttle is greater, the opening of the liquid storage solenoid valve can be increased, thereby increasing the flow rate at the liquid storage end of the refrigerant regulating branch, so that the liquid refrigerant entering the liquid storage device in the same time is increased. At this time, the gaseous refrigerant flowing into the liquid storage device also increases, and the opening of the liquid discharge solenoid valve is increased, that is, the discharge amount of gaseous refrigerant in the liquid storage device is increased to reduce the pressure in the liquid storage device and improve the liquid storage capacity of the liquid storage device.

[0091] When the content of gas refrigerant in the refrigerant flowing through the throttle is less, the content of liquid refrigerant is more. At this time, even if the opening of the liquid storage solenoid valve is small, more liquid refrigerant can flow into the liquid storage device. In addition, the gas refrigerant flowing into the liquid storage device is also less, and the opening of the liquid discharge solenoid valve can be reduced accordingly.

[0092] S024, starting from the time when the liquid storage solenoid valve is opened, the controller controls the throttle to maintain the first throttling state for a third preset time period, and then controls the throttle to be in the second throttling state of working throttling.

[0093] Before the liquid storage solenoid valve is opened, the throttle is in the first throttling state of full opening without throttling. After the liquid storage solenoid valve is opened, the throttle is still in the first throttling state of full opening without throttling. During the heating liquid storage process, the throttle is in a full opening without throttling working state. In this way, when the unthrottled refrigerant flows directly from the indoor heat exchanger to the outdoor heat exchanger, it will interfere with the normal operation of the outdoor heat exchanger and even the compressor, reducing the heat exchange performance of the heat exchange system.

[0094] In this embodiment, the controller controls the throttle to maintain the first throttling state for the third preset time period and then enters the second throttling state of working throttling. In this way, the throttle can continue to work throttling after being fully opened without 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 time is less than or equal to the first preset time. The throttle maintains the first throttling state for the third preset time and then operates to throttle. When the throttle changes from the first throttling state to the second throttling state, there is still a period of time when the refrigerant temperature difference is less than or equal to the preset temperature difference. During this time, 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 amount of refrigerant in 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 throttling state of working throttling.

[0098] S027, after the controller controls the throttle to maintain the second throttling state for a fourth preset time period, the controller controls the throttle to be in the first throttling state of fully open without throttling.

[0099] The amount of refrigerant in the liquid storage device is less than the first preset amount of refrigerant, which means that the amount of refrigerant in the liquid storage device is insufficient and refrigerant needs to be replenished. At this time, the controller controls the throttle to maintain the second throttling state for a fourth preset time, and then controls the throttle to be in the first throttling state again. When the refrigerant temperature difference between the first refrigerant temperature and the second refrigerant temperature is less than or equal to the preset temperature difference, the operation state of the liquid storage solenoid valve and the liquid discharge solenoid valve is controlled again to increase the amount of refrigerant in the liquid storage device.

[0100] In the disclosed embodiment, the throttle can be alternately in a working throttling state and a fully open non-throttling state, so as to increase the refrigerant storage capacity in the liquid storage device while taking into account the state of the refrigerant entering the outdoor heat exchanger, thereby improving the operating 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 a first preset amount of refrigerant, the controller controls the throttle to be in a second throttling state of working throttling until the pressure at the compressor exhaust port is greater than a preset pressure.

[0102] Exemplarily, adjusting the refrigerant storage amount of the refrigerant regulating branch to a second preset refrigerant amount includes:

[0103] The controller controls the throttle to be in a working throttling state, and the controller controls the liquid storage solenoid valve to be closed and the liquid discharge solenoid valve to be opened.

[0104] The second refrigerant storage is less than the first refrigerant storage, and the refrigerant storage in the liquid storage device needs to be reduced. The controller can control the liquid storage solenoid valve to close, reduce the refrigerant flowing into the liquid storage device, and increase the refrigerant storage in the liquid storage device. The discharge solenoid valve is opened, and the discharge end of the refrigerant regulating branch is connected to the return air port of the compressor. Under the traction force of the compressor, the refrigerant in the liquid storage device flows into the compressor through the discharge solenoid valve to reduce the refrigerant storage in the liquid storage device and increase the amount of refrigerant participating in the heat exchange cycle.

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

[0106] In addition, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

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

[0108] The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 101 may include a high-speed random access memory and may also include a non-volatile memory.

[0109] A heat exchange system provided by an embodiment of the present disclosure also includes the above-mentioned control device for the heat exchange system. The control device for the heat exchange system is installed in the heat exchange circuit or the refrigerant regulation circuit. The installation relationship described here is not limited to placement inside 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. It can be understood by those skilled in the art that the control device for the heat exchange system can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0110] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for a heat exchange system.

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

[0112] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0113] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0114] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

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

[0116] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, 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 they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by 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 circuit and a refrigerant regulating branch, wherein the heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence, a liquid storage end of the refrigerant regulating branch is connected to the heat exchange circuit located between the outdoor heat exchanger and the throttle, and a liquid discharge end of the refrigerant regulating branch is connected to the return air port of the compressor; the control method includes: Obtain the compressor exhaust pressure and the operating mode of the heat exchange system; The refrigerant storage capacity of the refrigerant regulating branch is adjusted according to the compressor exhaust pressure and the operating mode of the heat exchange system.

2. The control method according to claim 1, characterized in that: According to the compressor exhaust pressure and the operation mode of the heat exchange system, adjust the refrigerant storage of the refrigerant regulating branch, including: When the pressure at the compressor exhaust port is less than or equal to the preset pressure and the heat exchange system is in heating mode, the refrigerant storage amount of the refrigerant regulating branch is adjusted to a first preset refrigerant amount; When the pressure at the compressor exhaust port is greater than the preset pressure and the heat exchange system is in heating mode, adjusting the refrigerant storage amount of the refrigerant regulating branch to a second preset refrigerant amount; The first preset refrigerant amount is greater than the second preset refrigerant amount.

3. The control method according to claim 2, characterized in that: According to the compressor exhaust pressure and the operation mode of the heat exchange system, the refrigerant storage of the refrigerant regulating branch is adjusted, which also includes: When the pressure at the compressor exhaust port is less than or equal to the preset pressure and the heat exchange system is in cooling mode, adjusting the refrigerant storage amount of the refrigerant regulating branch to a third preset refrigerant amount; When the pressure at the compressor exhaust port is greater than the preset pressure and the heat exchange system is in cooling mode, adjusting the refrigerant storage amount of the refrigerant regulating branch to a 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: The refrigerant regulating branch includes a liquid storage solenoid valve, a liquid storage device and a liquid discharge solenoid valve connected in sequence, wherein the liquid storage solenoid valve is arranged at the liquid storage end of the refrigerant regulating branch, the liquid storage solenoid valve is connected to the liquid storage port of the liquid storage device, and the liquid discharge solenoid valve is arranged at the liquid discharge end of the refrigerant regulating branch, and the liquid discharge solenoid valve is connected to the liquid discharge port of the liquid storage device; Adjusting the refrigerant storage amount of the refrigerant regulating branch to a third preset refrigerant amount includes: controlling the throttle to be in a working throttling state, controlling the liquid storage solenoid valve to open to a third opening, and controlling the liquid discharge solenoid valve to open to a fourth opening; wherein the third opening is greater than the fourth opening; and / or, Adjusting the refrigerant storage amount of the refrigerant regulating branch to a fourth preset refrigerant amount includes: controlling the throttle to be in a working throttling state, controlling the liquid storage solenoid valve to be closed, and controlling the liquid discharge solenoid valve to be opened.

5. The control method according to claim 1, characterized in that: The refrigerant regulating branch includes a liquid storage solenoid valve, a liquid storage device and a liquid discharge solenoid valve connected in sequence, wherein the liquid storage solenoid valve is arranged at the liquid storage end of the refrigerant regulating branch, the liquid storage solenoid valve is connected to the liquid storage port of the liquid storage device, and the liquid discharge solenoid valve is arranged at the liquid discharge end of the refrigerant regulating branch, and the liquid discharge solenoid valve is connected to the liquid discharge port of the liquid storage device; Adjust the refrigerant storage of the refrigerant regulating branch, including: After the throttle is controlled to be in a first throttling state of full opening without throttling, a refrigerant temperature difference between a first refrigerant temperature and a second refrigerant temperature is determined; wherein the first refrigerant temperature is the temperature of the refrigerant after passing through the throttle, and the second refrigerant temperature is the temperature of the refrigerant between the indoor heat exchanger and the throttle; The operating status of the liquid storage solenoid valve and the liquid discharge solenoid valve is controlled according to the refrigerant temperature difference.

6. The control method according to claim 5, characterized in that: The operating status of the liquid storage solenoid valve and the liquid discharge solenoid valve is controlled according to the refrigerant temperature difference, including: When the refrigerant temperature difference is less than or equal to the preset temperature difference, the liquid storage solenoid valve is controlled to open to a first opening degree and maintained for a first preset time, and the liquid discharge solenoid valve is controlled to open to a second opening degree and maintained for a second preset time; The first opening degree is greater than the second opening degree, and the first preset time length is greater than or equal to the second preset time length.

7. The control method according to claim 5, characterized in that: The operating status of the liquid storage solenoid valve and the liquid discharge solenoid valve is controlled according to the refrigerant temperature difference, including: When the refrigerant temperature difference is less than or equal to the preset temperature difference, a first opening adjustment value of the liquid storage solenoid valve corresponding to the refrigerant temperature difference and a second opening adjustment value of the liquid discharge solenoid valve corresponding to the refrigerant temperature difference are obtained; Based on the current opening value of the liquid storage solenoid valve, adjusting 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 opening of the liquid discharge solenoid valve is adjusted according to the second opening adjustment value.

8. The control method according to claim 7, characterized in that: The first opening adjustment value is positively correlated with the refrigerant temperature difference.

9. The control method according to claim 7, characterized in that: The second opening adjustment value is positively correlated with the refrigerant temperature difference.

10. The control method according to claim 5, characterized in that: Adjusting the refrigerant storage of the refrigerant regulating branch also includes: Starting from the time when the liquid storage solenoid valve is opened, the throttle is controlled to maintain the first throttling state for a third preset time, and then the throttle is controlled to be in the second throttling state of working throttling; The third preset duration is less than or equal to the first preset duration.

11. The control method according to claim 5, characterized in that: Adjusting the refrigerant storage of the refrigerant regulating branch also includes: Obtaining the amount of refrigerant in 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 is controlled to be in a second throttling state of working throttling; After the throttle is controlled to maintain the second throttling state for a fourth preset time period, the throttle is controlled to be in the first throttling state of being fully open and not throttling.

12. The control method according to claim 11, characterized in that: Adjusting the refrigerant storage of 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 is controlled to be in the second throttling state of working throttling until the pressure at the compressor exhaust port is greater than the preset pressure.

13. 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 the control method for a heat exchange system according to any one of claims 1 to 12 when running the program instructions.

14. A heat exchange system, characterized in that: include: A heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttle and an indoor heat exchanger connected in sequence; A refrigerant regulating branch, comprising a liquid storage end and a liquid discharge end, wherein the liquid storage end is connected to a heat exchange circuit between an outdoor heat exchanger and a throttle, and the liquid discharge end is connected to a return air port of a compressor; and, The control device for a heat exchange system as claimed in claim 13.

15. The heat exchange system according to claim 14, characterized in that: The refrigerant conditioning branch includes: liquid storage device; A liquid storage solenoid valve is provided 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 arranged at the liquid discharge end of the refrigerant regulating branch and is connected to the liquid discharge port of the liquid storage device.

Images