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 throttling device and an indoor heat exchanger which are sequentially connected, and the refrigerant adjusting branch is connected with the heat exchange loop between the throttling device and the heat exchanger in parallel. The length of the heat exchange loop between the first end of the refrigerant adjusting branch and the throttling device is smaller than that of the heat exchange loop between the second end of the refrigerant adjusting branch and the throttling device; the control method comprises the steps that operation parameters of the heat exchange system are obtained; and the refrigerant storage amount of the refrigerant adjusting branch is adjusted according to the operation parameters of the heat exchange system. According to the embodiment of the invention, the operation parameters of the heat exchange system can be obtained, and the refrigerant storage amount of the refrigerant adjusting branch is adjusted according to the operation parameters of heat exchange, so that the rationality of the refrigerant amount, participating in heat exchange circulation, 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 failure to bring into play the optimal performance of the heat exchange system.

[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 a control device for a heat exchange system, and a heat exchange system to adjust the amount of refrigerant participating in a 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 includes a heat exchange circuit and a refrigerant regulating branch, the heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence, the refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the heat exchanger, and the length of the heat exchange circuit between the first end of the refrigerant regulating branch and the throttling device is smaller than the length of the heat exchange circuit between the second end of the refrigerant regulating branch and the throttling device; the control method includes: obtaining operating parameters of the heat exchange system; and adjusting the refrigerant storage of the refrigerant regulating branch according to the operating parameters of the heat exchange system.

[0010] In some optional embodiments, the operating parameters of the heat exchange system include the operating load of the heat exchange system; according to the operating parameters of the heat exchange system, the refrigerant reserves of the refrigerant regulating branch are adjusted, including: when the operating load of the heat exchange system is high load operation, reducing the refrigerant reserves of the refrigerant regulating branch; when the operating load of the heat exchange system is low load operation, increasing the refrigerant reserves of the refrigerant regulating branch.

[0011] In some optional embodiments, the operating load of the heat exchange system is determined as follows: the operating frequency of the compressor is obtained; when the operating frequency of the compressor is greater than or equal to the preset frequency, the operating load of the heat exchange system is determined to be high load operation; when the operating frequency of the compressor is less than the preset frequency, the operating load of the heat exchange system is determined to be low load operation.

[0012] In some optional embodiments, the operating parameters of the heat exchange system also include the operating mode of the heat exchange system; reducing the refrigerant storage capacity of the refrigerant regulating branch, including: determining the operating mode of the heat exchange system and the frequency change of the compressor within a preset time period; when the operating mode of the heat exchange system is the first heat exchange mode and the frequency change of the compressor is greater than or equal to the preset change, controlling the refrigerant regulating branch to quickly discharge; when the operating mode of the heat exchange system is the first heat exchange mode and the frequency change of the compressor is less than the preset change, controlling the refrigerant regulating branch to a normal discharge mode; wherein, when the heat exchanger is an outdoor heat exchanger, the first heat exchange mode is a heating mode; when the heat exchanger is an indoor heat exchanger, the first heat exchange mode is a cooling mode.

[0013] In some optional embodiments, the refrigerant regulating branch includes a first solenoid valve, a liquid storage device, and a second solenoid valve connected in sequence, the liquid storage device is provided with a first port and a second port, the first port is located at the lower end of the liquid storage device, and the second port is located at the upper end of the liquid storage device, the first solenoid valve is arranged at the first end of the refrigerant regulating branch, the first solenoid valve is connected to the first port, the second solenoid valve is arranged at the second end of the refrigerant regulating branch, and the second solenoid valve is connected to the second port; controlling the refrigerant regulating branch to discharge liquid quickly includes: controlling the first solenoid valve and the second solenoid valve to be opened; controlling the refrigerant regulating branch to discharge liquid normally includes: controlling the first solenoid valve to be opened, and the second solenoid valve to be closed.

[0014] In some optional embodiments, the operating parameters of the heat exchange system also include the operating mode of the heat exchange system; increasing the refrigerant reserves of the refrigerant regulating branch includes: determining the operating mode of the heat exchange system; when the operating mode of the heat exchange system is the first heat exchange mode, controlling the refrigerant regulating branch to quickly increase the liquid; when the operating mode of the heat exchange system is the second heat exchange mode, controlling the refrigerant regulating branch to increase the liquid normally; wherein, when the heat exchanger is an outdoor heat exchanger, the first heat exchange mode is the heating mode, and the second heat exchange mode is the cooling mode; when the heat exchanger is an indoor heat exchanger, the first heat exchange mode is the cooling mode, and the second heat exchange mode is the heating mode.

[0015] In some optional embodiments, the refrigerant regulating branch includes a first solenoid valve, a liquid storage device and a second solenoid valve connected in sequence, the liquid storage device is provided with a first port and a second port, the first port is located at the lower end of the liquid storage device, and the second port is located at the upper end of the liquid storage device, the first solenoid valve is arranged at the first end of the refrigerant regulating branch, the first solenoid valve is connected to the first port, the second solenoid valve is arranged at the second end of the refrigerant regulating branch, and the second solenoid valve is connected to the second port; controlling the refrigerant regulating branch to increase liquid quickly includes: controlling the throttling device to be fully open without throttling, and controlling the first solenoid valve and the second solenoid valve to be opened; wherein, the opening of the first solenoid valve is greater than the opening of the second solenoid valve; controlling the refrigerant regulating branch to increase liquid normally includes: controlling the throttling device to work throttling, controlling the first solenoid valve to be closed, and controlling the second solenoid valve to be open.

[0016] 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 of the foregoing items when running the program instructions.

[0017] 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 throttling device and an indoor heat exchanger connected in sequence; a refrigerant regulating branch, the refrigerant regulating branch being connected in parallel with the heat exchange circuit between the throttling device and the heat exchange circuit, and the length of the heat exchange circuit between the first end of the refrigerant regulating branch and the throttling device is less than the length of the heat exchange circuit between the second end of the refrigerant regulating branch and the throttling device; and a control device for a heat exchange system as described above.

[0018] In some optional embodiments, the refrigerant regulating branch includes: a liquid storage device, having a first port and a second port, the first port being located at the lower end of the liquid storage device, and the second port being located at the upper end of the liquid storage device; a first solenoid valve being disposed at the first end of the refrigerant regulating branch and connected to the first port; and a second solenoid valve being disposed at the second end of the refrigerant regulating branch and connected to the second port.

[0019] In some optional embodiments, the refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the indoor heat exchanger; or, the refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the outdoor heat exchanger.

[0020] The control method and device for a heat exchange system and the heat exchange system provided in the embodiments of the present disclosure can achieve the following technical effects:

[0021] The heat exchange system includes a heat exchange circuit and a refrigerant regulating branch, the liquid storage end of the refrigerant regulating branch is connected to the heat exchange circuit between the throttle and the indoor heat exchanger, and the liquid discharge end of the refrigerant regulating branch is connected to the return air port of the compressor. 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 refrigerant in the refrigerant regulating branch can flow 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 cycle. The disclosed embodiment 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 working conditions, thereby improving the performance of the heat exchange system.

[0022] 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

[0023] 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:

[0024] Figure 1is a flow chart of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0025] Figure 2 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0026] Figure 3 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0027] Figure 4 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0028] Figure 5 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0029] Figure 6 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0030] Figure 7 It is a structural schematic diagram of a control device for a heat exchange system provided in an embodiment of the present disclosure.

[0031] Reference numerals:

[0032] 100, processor; 101, memory; 102, communication interface; 103, bus; 200, outdoor heat exchanger; 300, throttling device; 400, indoor heat exchanger; 500, refrigerant regulating branch; 510, liquid storage device; 520, first solenoid valve; 530, second solenoid valve; 600, compressor. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The present disclosure provides a heat exchange system, such as Figure 5 and Figure 6 As shown, the heat exchange system includes a refrigerant regulating branch 500 of a heat exchange circuit, and the heat exchange circuit includes a compressor 600, an outdoor heat exchanger 200, a throttling device 300 and an indoor heat exchanger 400 connected in sequence, the refrigerant regulating branch 500 is connected in parallel with the heat exchange circuit between the throttling device 300 and the heat exchanger, and the length of the heat exchange circuit between the first end of the refrigerant regulating branch 500 and the throttling device 300 is less than the length of the heat exchange circuit between the second end of the refrigerant regulating branch 500 and the throttling device 300.

[0040] The heat exchanger includes an outdoor heat exchanger 200 or an indoor heat exchanger 400 .

[0041] In this embodiment, the heat exchange system includes a heat exchange circuit and a refrigerant regulating branch 500. The refrigerant regulating branch 500 is connected in parallel with the heat exchange circuit between the throttling device 300 and the heat exchanger. In this way, the refrigerant between the throttling device 300 and the heat exchanger can flow into the refrigerant regulating branch 500 through the first end and / or the second 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. Or the refrigerant flows out of the refrigerant regulating branch 500 to the heat exchange circuit through the first end and / or the second end of the refrigerant regulating branch 500, increasing the amount of refrigerant participating in the heat exchange cycle. This embodiment can adjust the amount of refrigerant participating in the refrigerant cycle in the heat exchange system, 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.

[0042] like Figure 5 As shown, when the heat exchanger includes an indoor heat exchanger 400, the refrigerant regulating branch 500 is connected in parallel with the heat exchange circuit between the throttling device 300 and the indoor heat exchanger 400. When the heat exchanger is the indoor heat exchanger 400, the first heat exchange mode is the cooling mode, and the second heat exchange mode is the heating mode.

[0043] In the first heat exchange mode, i.e., the cooling mode, the refrigerant flows through the compressor 600, the outdoor heat exchanger 200, the throttling device 300, and the indoor heat exchanger 400 in sequence, and then flows back into the compressor 600 to complete a refrigeration cycle. The refrigerant regulating branch 500 is connected in parallel with the heat exchange circuit between the throttling device 300 and the indoor heat exchanger 400, and the length of the heat exchange circuit between the first end of the refrigerant regulating branch 500 and the throttling device 300 is less than the length of the heat exchange circuit between the second end of the refrigerant regulating branch 500 and the throttling device 300. At this time, the refrigerant flowing through the throttling device 300 flows through the first end of the refrigerant regulating branch 500 and the second end of the refrigerant regulating branch 500 in sequence.

[0044] In the second heat exchange mode, i.e., the heating mode, the refrigerant flows through the compressor 600, the indoor heat exchanger 400, the throttling device 300, and the outdoor heat exchanger 200 in sequence, and then flows back into the compressor 600 to complete a heating cycle. At this time, the refrigerant flowing out of the indoor heat exchanger 400 (equivalent to the condenser) flows through the second end and the first end of the refrigerant regulating branch 500 in sequence.

[0045] Alternatively, if Figure 6 As shown, the refrigerant regulating branch 500 is connected in parallel with the heat exchange circuit between the throttling device 300 and the outdoor heat exchanger 200. When the heat exchanger is the outdoor heat exchanger 200, the first heat exchange mode is the heating mode, and the second heat exchange mode is the cooling mode.

[0046] In the first heat exchange mode, i.e., the heating mode, the refrigerant flows through the compressor 600, the indoor heat exchanger 400, the throttling device 300, and the outdoor heat exchanger 200 in sequence, and then flows back into the compressor 600 to complete a heating cycle. The refrigerant regulating branch 500 is connected in parallel with the heat exchange circuit between the throttling device 300 and the outdoor heat exchanger 200. And the length of the heat exchange circuit between the first end of the refrigerant regulating branch 500 and the throttling device 300 is less than the length of the heat exchange circuit between the second end of the refrigerant regulating branch 500 and the throttling device 300. At this time, the refrigerant flowing through the throttling device 300 flows through the first end of the refrigerant regulating branch 500 and the second end of the refrigerant regulating branch 500 in sequence.

[0047] In the second heat exchange mode, i.e., the cooling mode, the refrigerant flows through the compressor 600, the outdoor heat exchanger 200, the throttling device 300, and the indoor heat exchanger 400 in sequence, and then flows back into the compressor 600 to complete a refrigeration cycle. At this time, the refrigerant flowing out of the outdoor heat exchanger 200 (equivalent to the condenser) flows through the second end of the refrigerant regulating branch 500 and the first end of the refrigerant regulating branch 500 in sequence.

[0048] In some optional embodiments, such as Figure 5 and Figure 6 As shown, the refrigerant regulating branch 500 includes a first solenoid valve 520, a liquid storage device 510 and a second solenoid valve 530 connected in sequence, the liquid storage device 510 is provided with a first port and a second port, the first port is located at the lower end of the liquid storage device 510, and the second port is located at the upper end of the liquid storage device 510, the first solenoid valve 520 is arranged at the first end of the refrigerant regulating branch 500, and the first solenoid valve 520 is connected to the first port, the second solenoid valve 530 is arranged at the second end of the refrigerant regulating branch 500, and the second solenoid valve 530 is connected to the second port.

[0049] In this embodiment, the first solenoid valve 520 is disposed at the first end of the refrigerant regulating branch 500, and the first solenoid valve 520 is connected to the first port of the liquid storage device 510. In other words, the first end of the refrigerant regulating branch 500 is connected to the first port of the liquid storage device 510. The first end of the refrigerant regulating branch 500 is connected to the heat exchange circuit between the throttling device 300 and the heat exchanger, so that the refrigerant between the throttling device 300 and the heat exchanger can flow out of the liquid storage device 510 through the first end of the refrigerant regulating branch 500 and the first solenoid valve 520, or the refrigerant in the liquid storage device 510 can flow into the heat exchange circuit through the first end of the refrigerant regulating branch 500 and the first solenoid valve 520.

[0050] The second solenoid valve 530 is disposed at the second end of the refrigerant regulating branch 500, and the second solenoid valve 530 is connected to the second port of the liquid storage device 510. That is, the second end of the refrigerant regulating branch 500 is connected to the second port of the liquid storage device 510. The second end of the refrigerant regulating branch 500 is connected to the heat exchange circuit between the throttling device 300 and the heat exchanger. In this way, the refrigerant between the throttling device 300 and the heat exchanger can flow into the liquid storage device 510 through the second end of the refrigerant regulating branch 500 and the second solenoid valve 530, or the refrigerant in the liquid storage device 510 can flow into the heat exchange circuit through the first end of the refrigerant regulating branch 500 and the first solenoid valve 520. In this embodiment, the opening and closing of the first solenoid valve 520 and the second solenoid valve 530 can be controlled to control the refrigerant to flow into the liquid storage device 510, or to flow out of the liquid storage device 510, so as to adjust the amount of refrigerant stored in the liquid storage device 510, thereby adjusting the amount of refrigerant participating in the heat exchange cycle, improving the rationality of the amount of refrigerant participating in the heat exchange cycle of the heat exchange system under different working conditions, and improving the heat exchange performance of the heat exchange system.

[0051] 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.

[0052] S011, the controller obtains operating parameters of the heat exchange system.

[0053] S012: According to the operating parameters of the heat exchange system, the controller adjusts the refrigerant storage capacity of the refrigerant regulating branch.

[0054] In this embodiment, the operating parameters of the heat exchange system can be obtained, and the refrigerant storage capacity of the refrigerant regulating branch can be adjusted according to the operating parameters of the heat exchange system 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 of the heat exchange system under different working conditions and improve the performance of the heat exchange system.

[0055] Figure 2 It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

[0056] S021, the controller obtains operating parameters of the heat exchange system.

[0057] Optionally, the operating parameters of the heat exchange system include an operating load of the heat exchange system.

[0058] Exemplarily, the operating load of the heat exchange system may be determined as follows: the controller acquires the operating frequency of the compressor. When 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. When 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.

[0059] When the compressor operates at a high frequency, that is, when the compressor operates 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 high-load operation. When the compressor operates at a low frequency, that is, when the compressor operates 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 low-load operation.

[0060] S022: When the operating load of the heat exchange system is high load, the controller reduces the refrigerant storage capacity of the refrigerant regulating branch.

[0061] When the heat exchange system is running at high load, the heat exchange capacity of the heat exchange system increases, and the amount of refrigerant required by the heat exchange system to participate in the heat exchange cycle increases. At this time, the controller can reduce the refrigerant storage capacity of the refrigerant regulating branch, so that the refrigerant returns to the heat exchange circuit through the compressor to increase the amount of refrigerant participating in the heat exchange cycle, thereby improving the performance of the heat exchange system.

[0062] S023, when the operating load of the heat exchange system is low load operation, the controller increases the refrigerant storage capacity of the refrigerant regulating branch.

[0063] When the heat exchange system is running at low load, the heat exchange capacity of the heat exchange system is reduced. The amount of refrigerant involved in the heat exchange cycle can be reduced, and a smaller amount of refrigerant can meet the heat exchange capacity required by the heat exchange system when the heat exchange system is running at low load. At this time, the refrigerant storage capacity of the refrigerant regulating branch can be increased, the amount of refrigerant involved in the heat exchange cycle in the heat exchange loop can be reduced, and the increase in energy consumption when more refrigerant participates in the heat exchange cycle can be reduced, so as to improve the heat exchange performance of the heat exchange system.

[0064] Figure 3 It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

[0065] S031, the controller obtains operating parameters of the heat exchange system.

[0066] The operating parameters of the heat exchange system include the operating load of the heat exchange system.

[0067] S032: When the operating load of the heat exchange system is high load, the controller reduces the refrigerant storage capacity of the refrigerant regulating branch.

[0068] S033, when the operating load of the heat exchange system is low load operation, the controller determines the operating mode of the heat exchange system.

[0069] The operating parameters of the heat exchange system also include the operating mode of the heat exchange system. When the heat exchanger is an outdoor heat exchanger, the first heat exchange mode is a heating mode, and the second heat exchange mode is a cooling mode; when the heat exchanger is an indoor heat exchanger, the first heat exchange mode is a cooling mode, and the second heat exchange mode is a heating mode.

[0070] In this embodiment, it can be seen from the above that no matter the heat exchanger is an indoor heat exchanger or an outdoor heat exchanger, in the first heat exchange mode, the refrigerant flowing through the throttling device flows through the first end of the refrigerant regulating branch and the second end of the refrigerant regulating branch in sequence. In the second heat exchange mode, the refrigerant flowing out of the condenser flows through the second end of the refrigerant regulating branch and the first end of the refrigerant regulating branch in sequence.

[0071] S034, when the operation mode of the heat exchange system is the first heat exchange mode, the controller controls the refrigerant regulating branch to quickly increase the liquid.

[0072] Optionally, the controller controls the refrigerant regulating branch to quickly increase the liquid, including: the controller controls the throttling device to be fully opened without throttling, and the controller controls the first solenoid valve and the second solenoid valve to be opened, wherein the opening degree of the first solenoid valve is greater than the opening degree of the second solenoid valve.

[0073] When the heat exchange system operates in the first heat exchange mode, the refrigerant flowing through the throttling device flows through the first end of the refrigerant regulating branch and the second end of the refrigerant regulating branch in sequence. The controller controls the throttling device to be fully open without throttling, and the controller controls the first solenoid valve and the second solenoid valve to be opened. In this way, the refrigerant flowing out of the condenser can flow into the liquid storage device through the first end of the refrigerant regulating branch and the first solenoid valve. In addition, the first end of the refrigerant regulating device is connected to the first port, and the first port is located at the lower end of the liquid storage device. The second end of the refrigerant regulating device is connected to the second port, and the second port is located at the upper end of the liquid storage device. In this way, the high-pressure liquid refrigerant flowing out of the condenser can enter the lower end of the liquid storage device through the first port. Under the action of the liquid refrigerant, the gas refrigerant in the liquid storage device flows out of the second end of the refrigerant regulating branch through the second port and the second solenoid valve at the upper end of the liquid storage device. Thereby reducing the gaseous refrigerant in the liquid storage device, reducing the pressure in the liquid storage device during the process of storing the refrigerant in the liquid storage device, so as to increase the liquid storage rate and liquid storage amount of the liquid storage device.

[0074] The opening of the first solenoid valve is greater than that of the second solenoid valve, so that the inflow of liquid refrigerant is greater than the outflow of gaseous refrigerant, so that the pressure in the liquid storage device is still slightly greater than the pressure downstream of the second solenoid valve, so that the refrigerant can flow along the first end of the refrigerant regulating branch to the second end of the refrigerant regulating branch, reducing the occurrence of refrigerant flowing into the liquid storage device from the second end of the refrigerant regulating branch.

[0075] Furthermore, the controller obtains a second frequency change of the compressor within a preset time period, and the controller controls the openings of the first solenoid valve and the second solenoid valve according to the second frequency change of the compressor.

[0076] When the second frequency variation is greater than or equal to the second preset variation, the controller controls the opening of the first solenoid valve to be the first opening, and the controller controls the opening of the second solenoid valve to be the second opening. When the second frequency variation is less than the second preset variation, the controller controls the opening of the first solenoid valve to be the third opening, and the controller controls the opening of the second solenoid valve to be the fourth opening. The first opening is greater than the third opening, the first opening is greater than the second opening, the second opening is greater than the fourth opening, and the third opening is greater than the fourth opening.

[0077] Thus, within the preset time period, when the second frequency change is greater than or equal to the second preset change, the compressor frequency changes faster than when the second frequency change is less than the second preset change, and the amount of refrigerant in the heat exchange circuit needs to be reduced faster, thereby requiring rapid refilling of the refrigerant regulating branch. The first opening is greater than the third opening to increase the refrigerant flow rate at the first end of the refrigerant regulating branch and improve the refrigerant replenishment efficiency. Furthermore, when the refrigerant replenishment efficiency is faster, the pressure in the liquid storage device increases faster, and the second opening is greater than the fourth opening, which can increase the discharge rate of the gaseous refrigerant in the liquid storage device, further reducing the pressure in the liquid storage device to increase the speed of the refrigerant flowing into the liquid storage device.

[0078] S035, when the operation mode of the heat exchange system is the second heat exchange mode, the controller controls the refrigerant regulating branch to increase liquid normally.

[0079] In some optional embodiments, the controller controls the refrigerant regulating branch to increase the liquid normally, including: the controller controls the throttling device to work throttling, and the controller controls the first solenoid valve to close, and controls the second solenoid valve to open.

[0080] When the heat exchange system operates in the second heat exchange mode, the refrigerant flows out of the condenser and sequentially flows through the second end of the refrigerant regulating branch and the first end of the refrigerant regulating branch. At this time, the controller controls the throttling device to work throttling, and the controller controls the first solenoid valve to close and the second solenoid valve to open. In this way, the refrigerant flowing out of the condenser can flow into the liquid storage device through the second end of the refrigerant regulating branch and the first solenoid valve to increase the refrigerant in the liquid storage device.

[0081] Figure 4 It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

[0082] S041, the controller obtains operating parameters of the heat exchange system.

[0083] The operating parameters of the heat exchange system include the operating load of the heat exchange system.

[0084] S042, when the operating load of the heat exchange system is high load operation, the controller determines the operating mode of the heat exchange system and the frequency change of the compressor within a preset time.

[0085] The operating parameters of the heat exchange system also include the operating mode of the heat exchange system. Wherein, when the heat exchanger is an outdoor heat exchanger, the first heat exchange mode is a heating mode; when the heat exchanger is an indoor heat exchanger, the first heat exchange mode is a cooling mode.

[0086] S043, when the operation mode of the heat exchange system is the first heat exchange mode and the change in compressor frequency is greater than or equal to a preset change, the controller controls the refrigerant regulating branch to quickly discharge liquid.

[0087] Within the preset time period, the change in compressor frequency is greater than or equal to the preset change, the compressor frequency changes rapidly, the heating capacity of the heat exchange system increases rapidly, and the amount of refrigerant in the heat exchange circuit needs to be increased rapidly, thereby requiring the refrigerant regulating branch to be quickly discharged.

[0088] Exemplarily, the controller controls the refrigerant regulating branch to quickly discharge liquid, including: the controller controls the first solenoid valve and the second solenoid valve to open.

[0089] When the heat exchange system operates in the first heat exchange mode, the refrigerant flowing through the throttling device flows through the first end of the refrigerant regulating branch and the second end of the refrigerant regulating branch in sequence. When storing liquid, the liquid storage device stores high-pressure refrigerant flowing out of the condenser. When quickly discharging liquid, the controller controls the first solenoid valve and the second solenoid valve to be opened, and the controller can also control the throttling device to work throttling. In this way, the refrigerant after throttling by the throttling device is a low-pressure refrigerant. After the first solenoid valve and the second solenoid valve are opened, the high-pressure refrigerant in the liquid storage device can flow out of the liquid storage device through the first end of the refrigerant regulating branch and the second end of the refrigerant regulating branch under the action of the pressure difference, so as to increase the amount of refrigerant participating in the heat exchange cycle. In addition, the refrigerant in the liquid storage device can flow out through the refrigerant regulating branch, thereby increasing the speed at which the refrigerant flows into the heat exchange circuit, and increasing the amount of refrigerant flowing into the heat exchange circuit in the same time, so as to quickly increase the heat exchange amount of the heat exchange circuit.

[0090] S044, when the operation mode of the heat exchange system is the first heat exchange mode and the change in the compressor frequency is less than the preset change, control the refrigerant regulating branch to the normal liquid discharge mode.

[0091] Exemplarily, the controller controls the refrigerant regulating branch to discharge liquid normally, including: the controller controls the first solenoid valve to open, and controls the second solenoid valve to close.

[0092] In this embodiment, the controller controls the first solenoid valve to open and controls the second solenoid valve to close. The first solenoid valve is connected to the first port at the lower end of the liquid storage device. In this way, when the first solenoid valve is opened, the pressure in the liquid storage device is greater than the pressure of the heat exchange circuit at the connection between the first port and the heat exchange circuit, and the refrigerant in the liquid storage device can flow into the heat exchange circuit through the first port, the first solenoid valve and the first end of the refrigerant regulating branch to increase the amount of refrigerant participating in the heat exchange cycle, thereby increasing the heat exchange of the heat exchange system when the heat exchange system is running at high load.

[0093] Optionally, the controller reduces the refrigerant storage capacity of the refrigerant regulating branch, and further includes: when the operation mode of the heat exchange system is the second heat exchange mode, the controller controls the first solenoid valve to open, and the controller controls the second solenoid valve to close.

[0094] When the heat exchange system operates in the second heat exchange mode, the refrigerant flowing out of the condenser flows through the second end of the refrigerant regulating branch and the first end of the refrigerant regulating branch in sequence. The controller controls the first solenoid valve to open, and the controller controls the second solenoid valve to close. At this time, the refrigerant flowing out of the condenser is a high-pressure liquid refrigerant, and the heat exchange circuit is connected to the lower end of the liquid storage device through the first end of the refrigerant regulating branch and the first solenoid valve. The refrigerant in the liquid storage device can flow out of the liquid storage device under the traction of the flow of the refrigerant in the heat exchange circuit, so as to increase the refrigerant participating in the heat exchange cycle in the heat exchange circuit and improve the energy efficiency of the heat exchange circuit.

[0095] S045, when the operating load of the heat exchange system is low load operation, the controller increases the refrigerant storage capacity of the refrigerant regulating branch.

[0096] Combination Figure 7 As shown, an embodiment of the present disclosure provides a control device for a heat exchange loop, including a processor 100 and a memory 101. Optionally, the 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 the heat exchange system of the above embodiment.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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, the heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence, the refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the heat exchanger, and the length of the heat exchange circuit between the first end of the refrigerant regulating branch and the throttling device is less than the length of the heat exchange circuit between the second end of the refrigerant regulating branch and the throttling device; the control method includes: Obtaining operating parameters of the heat exchange system; According to the operating parameters of the heat exchange system, the refrigerant storage capacity of the refrigerant regulating branch is adjusted.

2. The control method according to claim 1, characterized in that: The operating parameters of the heat exchange system include the operating load of the heat exchange system; according to the operating parameters of the heat exchange system, the refrigerant storage of the refrigerant regulating branch is adjusted, including: When the heat exchange system is running at high load, reduce the refrigerant storage capacity of the refrigerant regulating branch; When the heat exchange system is operated at a low load, the refrigerant storage capacity of the refrigerant regulating branch is increased.

3. The control method according to claim 2, characterized in that: Determine the operating load of the heat exchange system as follows: Obtain the operating frequency of the compressor; When the operating frequency of the compressor is greater than or equal to the preset frequency, determining that the operating load of the heat exchange system is high load operation; When the operating frequency of the compressor is less than the preset frequency, it is determined that the operating load of the heat exchange system is low-load operation.

4. The control method according to claim 2, characterized in that: The operating parameters of the heat exchange system also include the operating mode of the heat exchange system; reducing the refrigerant storage capacity of the refrigerant regulating branch, including: Determine the operating mode of the heat exchange system and the frequency change of the compressor within a preset time period; When the operation mode of the heat exchange system is the first heat exchange mode and the change in the compressor frequency is greater than or equal to the preset change, the refrigerant regulating branch is controlled to quickly discharge liquid; When the operation mode of the heat exchange system is the first heat exchange mode and the change in the compressor frequency is less than the preset change, the refrigerant regulating branch is controlled to be in a normal liquid discharge mode; Wherein, when the heat exchanger is an outdoor heat exchanger, the first heat exchange mode is a heating mode; when the heat exchanger is an indoor heat exchanger, the first heat exchange mode is a cooling mode.

5. The control method according to claim 4, characterized in that: The refrigerant regulating branch includes a first solenoid valve, a liquid storage device, and a second solenoid valve connected in sequence, the liquid storage device is provided with a first port and a second port, the first port is located at the lower end of the liquid storage device, and the second port is located at the upper end of the liquid storage device, the first solenoid valve is provided at the first end of the refrigerant regulating branch, the first solenoid valve is connected to the first port, the second solenoid valve is provided at the second end of the refrigerant regulating branch, and the second solenoid valve is connected to the second port; Controlling the refrigerant regulating branch to quickly discharge liquid, including: controlling the first solenoid valve and the second solenoid valve to be opened; Controlling the refrigerant regulating branch to discharge liquid normally includes: controlling the first solenoid valve to open and the second solenoid valve to close.

6. The control method according to claim 2, characterized in that: The operating parameters of the heat exchange system also include the operating mode of the heat exchange system; increasing the refrigerant storage capacity of the refrigerant regulating branch, including: Determine the operating mode of the heat exchange system; When the operation mode of the heat exchange system is the first heat exchange mode, controlling the refrigerant regulating branch to quickly increase liquid; When the operation mode of the heat exchange system is the second heat exchange mode, the refrigerant regulating branch is controlled to increase liquid normally; Among them, when the heat exchanger is an outdoor heat exchanger, the first heat exchange mode is the heating mode, and the second heat exchange mode is the cooling mode; when the heat exchanger is an indoor heat exchanger, the first heat exchange mode is the cooling mode, and the second heat exchange mode is the heating mode.

7. The control method according to claim 6, characterized in that: The refrigerant regulating branch includes a first solenoid valve, a liquid storage device, and a second solenoid valve connected in sequence, the liquid storage device is provided with a first port and a second port, the first port is located at the lower end of the liquid storage device, and the second port is located at the upper end of the liquid storage device, the first solenoid valve is provided at the first end of the refrigerant regulating branch, the first solenoid valve is connected to the first port, the second solenoid valve is provided at the second end of the refrigerant regulating branch, and the second solenoid valve is connected to the second port; Controlling the rapid increase of liquid in the refrigerant regulating branch includes: controlling the throttling device to be fully opened without throttling, and controlling the first solenoid valve and the second solenoid valve to be opened; wherein the opening degree of the first solenoid valve is greater than the opening degree of the second solenoid valve; Controlling the normal liquid increase of the refrigerant regulating branch includes: controlling the throttling device to work throttling, controlling the first solenoid valve to close, and controlling the second solenoid valve to open.

8. A control device for a heat exchange system, characterized in that: The invention comprises a processor and a memory storing program instructions, wherein the processor is configured to execute the control method for a heat exchange system according to any one of claims 1 to 7 when running the program instructions.

9. A heat exchange system, characterized in that: include: A heat exchange circuit includes a compressor, an outdoor heat exchanger, a throttling device and an indoor heat exchanger connected in sequence; A refrigerant regulating branch, the refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the heat exchange circuit, and the length of the heat exchange circuit between the first end of the refrigerant regulating branch and the throttling device is less than the length of the heat exchange circuit between the second end of the refrigerant regulating branch and the throttling device; The control device for a heat exchange system as claimed in claim 8.

10. The heat exchange system according to claim 9, characterized in that: The refrigerant conditioning branch includes: A liquid storage device, provided with a first port and a second port, wherein the first port is located at a lower end of the liquid storage device, and the second port is located at an upper end of the liquid storage device; A first solenoid valve is disposed at a first end of the refrigerant regulating branch and connected to the first port; The second solenoid valve is arranged at the second end of the refrigerant regulating branch and is connected to the second port.

11. The heat exchange system according to claim 9 or 10, characterized in that: The refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the indoor heat exchanger; or, The refrigerant regulating branch is connected in parallel with the heat exchange circuit between the throttling device and the outdoor heat exchanger.

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