Heat exchange system and control method and device for heat exchange system

Abstract

The invention relates to the technical field of heat exchange systems, and discloses a heat exchange system and a control method and device for the heat exchange system. The heat exchange system comprises a heat exchange loop and further comprises a three-way pipe, the three-way pipe comprises a first pipe section, a second pipe section and a third pipe section which are communicated, the first pipe section is communicated with the first throttling device, and the second pipe section is communicated with the heat exchanger; wherein the heat exchanger is an outdoor heat exchanger or an indoor heat exchanger; a refrigerant inlet of the liquid storage device communicates with the third pipe section, the three-way pipe can separate a gas refrigerant and a liquid refrigerant in the refrigerant flowing through the first throttling device, and the gas refrigerant can flow into the liquid storage device through the third pipe section; and the air return pipe is communicated between the refrigerant outlet of the liquid storage device and the air return port of the compressor. According to the embodiment, the amount of the refrigerant participating in the heat exchange circulation can be adjusted, the reasonability of the amount of the refrigerant participating in the heat exchange circulation is improved, and the heat exchange energy efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchange systems, for example, to a heat exchange system, and a control method and device for 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 heat exchange system, a control method and a device for the heat exchange system, so as to adjust the refrigerant involved in the heat exchange cycle and improve the performance of the heat exchange system.

[0009] According to an embodiment of the first aspect of the present application, a heat exchange system is provided, which includes a heat exchange circuit, the heat exchange circuit includes a compressor, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger connected in sequence, and the heat exchange system also includes: a three-way pipe, including a first pipe section, a second pipe section and a third pipe section that are connected to each other, the first pipe section is connected to the first throttling device, and the second pipe section is connected to the heat exchanger; wherein the heat exchanger is an outdoor heat exchanger or an indoor heat exchanger; a liquid storage device, the refrigerant inlet of the liquid storage device is connected to the third pipe section, the three-way pipe can separate the gas refrigerant and the liquid refrigerant in the refrigerant flowing through the first throttling device, and the gaseous refrigerant can flow into the liquid storage device through the third pipe section; a return air pipe, connected between the refrigerant outlet of the liquid storage device and the return air port of the compressor.

[0010] In some optional embodiments, the third pipe segment is arranged above the second pipe segment, and there is a fold angle between the third pipe segment and the first pipe segment.

[0011] In some optional embodiments, the opening of the angle is upward, and the angle range of the angle is 30 to 70 degrees; and / or, the extension direction of the second tube segment is the same as the extension direction of the third tube segment.

[0012] In some optional embodiments, the liquid storage device includes a liquid storage tank, the refrigerant outlet of the liquid storage device is connected to the refrigerant outlet of the liquid storage tank, and the refrigerant inlet of the liquid storage device is connected to the refrigerant inlet of the liquid storage tank; the refrigerant outlet of the liquid storage tank is arranged at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the lower end of the liquid storage tank; and / or,

[0013] Along the radial direction of the liquid storage tank, the refrigerant outlet of the liquid storage tank is arranged at one end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the other end of the liquid storage tank.

[0014] In some optional embodiments, along the axial direction of the liquid storage tank, the ratio of the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank to the axial length of the liquid storage tank ranges from 0 to 0.1; and / or,

[0015] Along the axial direction of the liquid storage tank, the ratio of the length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank to the axial length of the liquid storage tank ranges from 0 to 0.1.

[0016] In some optional embodiments, along the radial direction of the liquid storage tank, the ratio of the length of the line between the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank to the inner diameter of the liquid storage tank is in a range of 0.6 to 1.

[0017] In some optional embodiments, the liquid storage device includes a liquid storage tank, and the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third tube segment is in a range of 5 to 10.

[0018] In some optional embodiments, the heat exchange system further includes: a second throttling device, arranged in the return air pipe; and / or,

[0019] The solenoid valve is arranged between the refrigerant inlet of the liquid storage device and the third pipe section.

[0020] According to an embodiment of the second aspect of the present application, a control method for a heat exchange system is provided. The heat exchange system is the heat exchange system described above, and the control method includes: obtaining operating parameters of the heat exchange system; and adjusting the refrigerant storage capacity of the liquid storage device according to the operating parameters of the heat exchange system.

[0021] According to an embodiment of the third 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 the control method for a heat exchange system as described above when running the program instructions.

[0022] The heat exchange system, control method and device for the heat exchange system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0023] The first pipe section is connected to the first throttling device, the second pipe section is connected to the heat exchanger, and the third pipe section is connected to the liquid storage device. That is to say, when the refrigerant flows through the three-way pipe, the refrigerant can flow to the liquid storage device through the three-way pipe, so that the liquid storage device can store the refrigerant, reduce the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit, improve the rationality of the amount of refrigerant participating in the heat exchange cycle, and improve the heat exchange energy efficiency. In addition, the three-way pipe can separate the gaseous refrigerant and the liquid refrigerant in the refrigerant flowing through the first throttling device, and the separated gaseous refrigerant can flow into the liquid storage device through the third pipe section. The return pipe is connected between the refrigerant outlet of the liquid storage device and the return air port of the compressor. In this way, the gaseous refrigerant in the liquid storage device can flow back to the return air port of the compressor through the return air pipe to replenish the compressor, increase the return air volume of the compressor, and thus increase the heating capacity of the compressor. In addition, the refrigerant in the liquid storage device can also flow out of the liquid storage device through the return air pipe, thereby flowing back to the heat exchange circuit to increase the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit. This embodiment can adjust the amount of refrigerant involved in the heat exchange cycle, improve the rationality of the amount of refrigerant involved in the heat exchange cycle, and improve the heat exchange energy efficiency.

[0024] 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

[0025] 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:

[0026] Figure 1 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0027] Figure 2 It is a structural schematic diagram of a connection between a three-way pipe and a liquid storage device provided by an embodiment of the present disclosure;

[0028] Figure 3 is a schematic structural diagram of another connection between a three-way pipe and a liquid storage device provided by an embodiment of the present disclosure;

[0029] Figure 4 is a structural schematic diagram of another connection between a three-way pipe and a liquid storage device provided in an embodiment of the present disclosure;

[0030] Figure 5 is a structural schematic diagram of another connection between a three-way pipe and a liquid storage device provided in an embodiment of the present disclosure;

[0031] Figure 6 is a simulation schematic diagram of a connection between a three-way pipe and a liquid storage device provided by an embodiment of the present disclosure;

[0032] Figure 7 is a simulation schematic diagram of another connection between a three-way pipe and a liquid storage device provided by an embodiment of the present disclosure;

[0033] Figure 8 is a simulation schematic diagram of the connection between another three-way pipe and a liquid storage device provided by an embodiment of the present disclosure;

[0034] Fig. 9 is a flow chart of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0035] Fig.10 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0036] Fig.11 is a flow chart of another control method for a heat exchange system provided by an embodiment of the present disclosure;

[0037] Fig.12 It is a structural schematic diagram of a control device for a heat exchange system provided in an embodiment of the present disclosure.

[0038] Reference numerals:

[0039] 100, processor; 101, memory; 102, communication interface; 103, bus; 200, compressor; 300, outdoor heat exchanger; 400, first throttling device; 500, indoor heat exchanger; 600, three-way pipe; 610, first pipe section; 620, second pipe section; 630, third pipe section; 640, solenoid valve; 700, liquid storage device; 800, return air pipe; 810, second throttling device; 900, outlet pipe section; 910, first outlet pipe section; 920, second outlet pipe section. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The present disclosure provides a heat exchange system, such as Figure 1 As shown, the heat exchange system includes a compressor 200, an outdoor heat exchanger 300, a first throttling device 400 and an indoor heat exchanger 500 which are connected in sequence.

[0047] When the heat exchange system operates in cooling mode, the refrigerant flows out of the compressor 200, flows through the outdoor heat exchanger 300, the first throttling device 400 and the indoor heat exchanger 500 in sequence, and then flows back into the compressor 200 to complete a refrigeration cycle. At this time, the outdoor heat exchanger 300 acts as a condenser, and the refrigerant condenses and releases heat in the outdoor heat exchanger 300. The indoor heat exchanger 500 acts as an evaporator, and the refrigerant evaporates and absorbs heat in the indoor heat exchanger 500 to absorb indoor heat, provide cooling to the room, and reduce the indoor temperature.

[0048] When the heat exchange system operates in heating mode, the refrigerant flows out of the compressor 200, passes through the indoor heat exchanger 500, the first throttling device 400 and the outdoor heat exchanger 300 in sequence, and then flows back into the compressor 200 to complete a heating cycle. At this time, the indoor heat exchanger 500 acts as a condenser, and the refrigerant condenses and releases heat in the indoor heat exchanger 500 to increase the heat indoors and increase the indoor temperature. The outdoor heat exchanger 300 acts as an evaporator, and the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 300, and becomes a gaseous refrigerant to be supplied to the compressor 200.

[0049] like Figures 1 to 5 As shown, the heat exchange system also includes a three-way pipe 600, a liquid storage device 700 and a return pipe 800. The three-way pipe 600 includes a first pipe section 610, a second pipe section 620 and a third pipe section 630 that are connected to each other. The first pipe section 610 is connected to the first throttling device 400, and the second pipe section 620 of the three-way pipe 600 is connected to the heat exchanger. Among them, the heat exchanger is an outdoor heat exchanger 300 or an indoor heat exchanger 500. The refrigerant inlet of the liquid storage device 700 is connected to the third pipe section 630. The three-way pipe 600 can separate the gas refrigerant and the liquid refrigerant in the refrigerant flowing through the first throttling device 400, and the gas refrigerant can flow into the liquid storage device 700 through the third pipe section 630. The return pipe 800 is connected between the refrigerant outlet of the liquid storage device 700 and the return air port of the compressor 200.

[0050] In this embodiment, the first pipe section 610 is connected to the first throttling device 400, and the second pipe section 620 is connected to the heat exchanger. The heat exchanger is the outdoor heat exchanger 300 or the indoor heat exchanger 500. When the heat exchanger is the outdoor heat exchanger 300, in the cooling mode, the refrigerant flows through the outdoor heat exchanger 300, the second pipe section 620, the first pipe section 610 and the first throttling device 400 in sequence; in the heating mode, the refrigerant flows through the first throttling device 400, the first pipe section 610, the second pipe section 620 and the outdoor heat exchanger 300 in sequence. When the heat exchanger is an indoor heat exchanger 500, in the cooling mode, the refrigerant in the heat exchange circuit flows through the first throttling device 400, the first pipe segment 610, the second pipe segment 620 and the indoor heat exchanger 500 in sequence; in the heating mode, the refrigerant in the heat exchange circuit flows through the indoor heat exchanger 500, the second pipe segment 620, the first pipe segment 610 and the first throttling device 400 in sequence.

[0051] With this optional embodiment, the first pipe section 610 is connected to the first throttling device 400, the second pipe section 620 is connected to the heat exchanger, and the third pipe section 630 is connected to the liquid storage device 700. That is to say, when the refrigerant flows through the three-way pipe 600, the refrigerant can flow to the liquid storage device 700 through the three-way pipe 600, so that the liquid storage device 700 can store the refrigerant, reduce the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit, improve the rationality of the amount of refrigerant participating in the heat exchange cycle, and improve the heat exchange energy efficiency. In addition, the three-way pipe 600 can separate the gaseous refrigerant and the liquid refrigerant in the refrigerant flowing through the first throttling device 400, and the separated gaseous refrigerant can flow into the liquid storage device 700 through the third pipe section 630. The return pipe 800 is connected between the refrigerant outlet of the liquid storage device 700 and the return air port of the compressor 200. In this way, the gaseous refrigerant in the liquid storage device 700 can flow back to the return air port of the compressor 200 through the return air pipe 800 to replenish air and increase the return air volume of the compressor 200, thereby increasing the heating capacity of the compressor 200. In addition, the refrigerant in the liquid storage device 700 can also flow out of the liquid storage device 700 through the return air pipe 800, thereby flowing back to the heat exchange circuit, so as to increase the amount of refrigerant participating in the heat exchange cycle of the heat exchange circuit, improve the rationality of the amount of refrigerant participating in the heat exchange cycle, and improve the heat exchange energy efficiency.

[0052] Alternatively, if Figures 2 to 5 As shown, the third pipe section 630 is disposed above the second pipe section 620 , and there is a fold angle between the third pipe section 630 and the first pipe section 610 .

[0053] With this optional embodiment, the refrigerant can flow into the three-way pipe 600 after passing through the first throttling device 400. One end of the first pipe segment 610, one end of the second pipe segment 620 and one end of the third pipe segment 630 are all connected. There is a fold angle between the third pipe segment 630 and the first pipe segment 610. In this way, after the gas-liquid two-phase refrigerant flowing through the first throttling device 400 passes through the first pipe segment 610, it can collide with the inner wall of the third pipe segment 630 at the connection between the first pipe segment 610 and the third pipe segment 630, and the third pipe segment 630 hinders the refrigerant from continuing to flow, and the flow rate of the refrigerant slows down or stays briefly at the connection. The third pipe segment 630 is located above the second pipe segment 620, so that the gas refrigerant in the gas-liquid two-phase refrigerant can flow upward at the connection to flow into the third pipe segment 630, and then flow into the liquid storage device 700. The liquid refrigerant in the gas-liquid two-phase refrigerant can flow downward by its own gravity and flow into the second pipe section 620, and then flow to the heat exchanger to continue the heat exchange cycle.

[0054] In this embodiment, when the refrigerant flows out of the three-way pipe 600 through the first pipe section 610, gas-liquid separation can be performed between the second pipe section 620 and the third pipe section 630 to increase the gaseous refrigerant flowing into the liquid storage device 700, thereby improving the dryness of the refrigerant provided by the liquid storage device 700 to the return air port of the compressor 200 through the return air pipe 800, reducing the liquid refrigerant flowing into the compressor 200, and improving the service life and operating stability of the compressor 200.

[0055] Furthermore, the extending direction of the second tube segment 620 is the same as the extending direction of the third tube segment 630 .

[0056] In this optional embodiment, the extension direction of the second pipe segment 620 is the same as the extension direction of the third pipe segment 630, that is, the first pipe segment 610 and the second pipe segment 620 are arranged in a straight line. In this way, when the gas-liquid two-phase refrigerant flows to the connection between the first pipe segment 610, the second pipe segment 620 and the third pipe segment 630, the gas-liquid two-phase refrigerant can collide with the inner wall of the second pipe segment 620 and the inner wall of the third pipe segment 630. Compared with the solution in which the second pipe segment 620 and the third pipe segment 630 extend in different directions, this embodiment can increase the area of ​​the gas-liquid two-phase refrigerant colliding with the inner wall of the pipe segment at the connection of the three pipe segments, and enable the gaseous refrigerant to move upward without bending, so as to increase the refrigerant amount of the gas refrigerant flowing into the liquid storage device 700.

[0057] Furthermore, the opening of the folded corner is upward, and the folded corner has an angle ranging from 30 to 70 degrees.

[0058] With this optional embodiment, the angle between the first pipe segment 610 and the third pipe segment 630 opens upward, and the angle range of the angle is 30 to 70 degrees. That is, the angle between the first pipe segment 610 and the third pipe segment 630 is smaller than the angle between the first pipe segment 610 and the second pipe segment 620. In this way, when the refrigerant flows into the three-way pipe 600 along the first pipe segment 610, the tendency of the refrigerant to move along the second pipe segment 620 is greater than the tendency of the refrigerant to move along the first pipe segment 610, so that more refrigerant can still flow into the second pipe segment 620 and into the heat exchanger, so as to realize the normal heat exchange cycle of the heat exchange circuit.

[0059] For example, the angle of the bend between the first pipe segment 610 and the third pipe segment 630 may be 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees or 70 degrees, etc. Optionally, the ratio of the amount of refrigerant flowing into the second pipe segment 620 to the total amount of refrigerant flowing into the first pipe segment 610 is inversely proportional to the angle of the bend. The smaller the angle of the bend, the greater the amount of refrigerant flowing into the second pipe segment 620, and the greater the angle of the bend, the smaller the amount of refrigerant flowing into the second pipe segment 620.

[0060] In some optional embodiments, the liquid storage device 700 includes a liquid storage tank, the refrigerant outlet of the liquid storage device 700 is connected to the refrigerant outlet of the liquid storage tank, the refrigerant inlet of the liquid storage device 700 is connected to the refrigerant inlet of the liquid storage tank, and the refrigerant flowing into the liquid storage device 700 can be stored in the liquid storage tank. The refrigerant outlet of the liquid storage device 700 is connected to the refrigerant outlet of the liquid storage tank, and the return air pipe 800 is connected to the refrigerant outlet of the liquid storage device 700, so that the return air pipe 800 is connected to the refrigerant outlet of the liquid storage tank. The refrigerant inlet of the liquid storage device 700 is connected to the refrigerant inlet of the liquid storage tank, and the refrigerant inlet of the liquid storage device 700 is connected to the third pipe section 630, so that the third pipe section 630 is connected to the refrigerant inlet of the liquid storage tank.

[0061] Exemplarily, the refrigerant outlet of the liquid storage tank is disposed at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is disposed at the lower end of the liquid storage tank.

[0062] In this embodiment, the gaseous refrigerant in the liquid storage tank is located at the upper part of the liquid storage tank, and the liquid refrigerant is located at the lower part of the liquid storage tank. The refrigerant outlet of the liquid storage tank is connected to the return air pipe 800, and the liquid storage tank provides the gaseous refrigerant to the compressor 200 through the return air pipe 800. The refrigerant outlet of the liquid storage tank is arranged at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the lower end of the liquid storage tank. In this way, the separation degree of the gaseous refrigerant and the liquid refrigerant in the liquid storage tank is improved, so that the dryness of the refrigerant flowing into the return air pipe 800 can be improved, that is, the gaseous refrigerant flowing into the return air pipe 800 is increased, the return air of the compressor 200 is reduced, and the service life and operation stability of the compressor 200 are improved. Figure 6A simulation schematic diagram of a connection embodiment of a three-way pipe 600 and a liquid storage device 700 is shown, from which it can be seen that the liquid refrigerant is located at the lower end of the liquid storage tank, and the gas-liquid refrigerant is located at the upper end of the liquid storage tank. The dryness of the refrigerant gradually increases from bottom to top along the liquid storage device 700.

[0063] Furthermore, along the axial direction of the liquid storage tank, the ratio of the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank to the axial length of the liquid storage tank ranges from 0 to 0.1.

[0064] When the ratio between the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank and the axial length of the liquid storage tank is 0, the refrigerant outlet of the liquid storage tank is arranged on the top wall of the liquid storage tank. When the ratio is greater than 0, and the ratio is less than or equal to 0.1, the refrigerant outlet of the liquid storage tank is arranged at the upper end of the side wall of the liquid storage tank, or the side wall at the refrigerant outlet of the liquid storage tank extends into the liquid storage tank through the top wall of the liquid storage tank. Exemplarily, the ratio between the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank and the axial length of the liquid storage tank is 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0065] Optionally, along the axial direction of the liquid storage tank, a ratio of a length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank to an axial length of the liquid storage tank ranges from 0 to 0.1.

[0066] When the ratio between the length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank and the axial length of the liquid storage tank is 0, the refrigerant inlet of the liquid storage tank is located at the bottom wall of the liquid storage tank. When the ratio is greater than 0, and the ratio is less than or equal to 0.1, the refrigerant inlet of the liquid storage tank is located at the lower end of the side wall of the liquid storage tank, or the side wall at the refrigerant inlet of the liquid storage tank extends into the liquid storage tank through the bottom wall of the liquid storage tank. Exemplarily, the ratio between the length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank and the axial length of the liquid storage tank is 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09 or 0.1, etc.

[0067] Alternatively, if Figure 2As shown, the refrigerant inlet of the liquid storage tank is arranged at the bottom wall of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is arranged at the upper end of the circumferential side wall of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a tendency to move along the axial direction of the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows radially along the liquid storage tank. Due to the impact of the refrigerant in the three-way pipe 600, not only the gaseous refrigerant can flow into the liquid storage tank through the third pipe section 630, but also a small amount of liquid refrigerant can enter the liquid storage tank through the third pipe section 630. In the process of the refrigerant flowing into and out of the liquid storage tank, the flow direction of the refrigerant changes to increase the storage time of the same refrigerant in the liquid storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the liquid storage tank and improving the dryness of the refrigerant flowing out of the refrigerant outlet of the liquid storage tank.

[0068] Alternatively, if Figure 4 As shown, the refrigerant inlet of the liquid storage tank is arranged at the lower end of the circumferential side wall of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is arranged at the top wall of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a radial movement trend along the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows along the axial direction of the liquid storage tank. Due to the impact of the refrigerant in the three-way pipe 600, not only the gaseous refrigerant can flow into the liquid storage tank through the third pipe section 630, but also a small amount of liquid refrigerant can enter the liquid storage tank through the third pipe section 630. In the process of the refrigerant flowing into and out of the liquid storage tank, the flow direction of the refrigerant changes to increase the storage time of the same refrigerant in the liquid storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the liquid storage tank and improving the dryness of the refrigerant flowing out of the refrigerant outlet of the liquid storage tank.

[0069] In some optional embodiments, along the radial direction of the liquid storage tank, the refrigerant outlet of the liquid storage tank is arranged at one end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the other end of the liquid storage tank.

[0070] In this embodiment, along the radial direction of the liquid storage tank, the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank are respectively arranged at two opposite ends of the liquid storage tank. And the refrigerant inlet of the liquid storage tank and the refrigerant outlet of the liquid storage tank are respectively arranged at the upper end of the liquid storage tank and the lower end of the liquid storage tank. In other words, the refrigerant inlet of the liquid storage tank and the refrigerant outlet of the liquid storage tank are arranged in a quasi-diagonal line in the liquid storage tank. This can reduce the following situations: when the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank are both arranged in a straight line along the axial direction of the liquid storage tank, the refrigerant flowing out of the liquid storage tank through the refrigerant inlet of the liquid storage tank can directly flow out of the liquid storage tank under the suction of the refrigerant outlet of the upper liquid storage tank, which reduces the time of the refrigerant in the liquid storage tank, reduces the gas-liquid separation effect of the refrigerant, and reduces the dryness of the refrigerant flowing out of the liquid storage tank.

[0071] Figure 7A simulation schematic diagram of another embodiment of the connection between a three-way pipe 600 and a liquid storage device 700 is shown. Among them, the refrigerant inlet of the liquid storage tank is arranged at the bottom wall of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is arranged at the top wall of the liquid storage tank. And along the radial direction of the liquid storage tank, the refrigerant inlet of the liquid storage tank and the refrigerant outlet of the liquid storage tank are respectively arranged at both ends of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a movement tendency along the axial direction of the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows in the radial direction of the liquid storage tank. In the process of the refrigerant flowing into and out of the liquid storage tank, the flow direction of the refrigerant changes, the refrigerant guide path is increased, and the storage time of the same refrigerant in the liquid storage tank is increased, thereby improving the gas-liquid separation degree of the refrigerant entering the liquid storage tank and improving the dryness of the refrigerant flowing out of the refrigerant outlet of the liquid storage tank. In this embodiment, the refrigerant with a dryness of 0.2 flows into the three-way pipe 600 through the first pipe section 610. When the refrigerant flows out through the refrigerant outlet of the liquid storage tank, the refrigerant dryness can be increased to 0.6.

[0072] Figure 8 A simulation schematic diagram of another embodiment of the connection between a three-way pipe 600 and a liquid storage device 700 is shown. Among them, the refrigerant inlet of the liquid storage tank is arranged at the lower end of the circumferential side wall of the liquid storage tank, and the refrigerant outlet of the liquid storage tank is arranged at the top wall of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a radial movement trend along the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows along the axial direction of the liquid storage tank. In the process of the refrigerant flowing into and out of the liquid storage tank, the flow direction of the refrigerant changes to increase the flow path of the refrigerant, and increases the storage time of the same refrigerant in the liquid storage tank, thereby improving the gas-liquid separation degree of the refrigerant entering the liquid storage tank and improving the dryness of the refrigerant flowing out of the refrigerant outlet of the liquid storage tank. In this embodiment, the refrigerant with a dryness of 0.2 flows into the three-way pipe 600 through the first pipe section 610, and when the refrigerant flows out through the refrigerant outlet of the liquid storage tank, the refrigerant dryness can be increased to 0.98.

[0073] Furthermore, along the radial direction of the liquid storage tank, the ratio of the length of the line between the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank to the inner diameter of the liquid storage tank is in a range of 0.6 to 1.

[0074] When the ratio of the length of the line between the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank to the inner diameter of the liquid storage tank is 1, the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank are both arranged on the circumferential side wall of the liquid storage tank. When the ratio is greater than or equal to 0.6 and the ratio is less than 1, the refrigerant outlet of the liquid storage tank may be arranged on the circumferential side wall of the liquid storage tank, and the refrigerant inlet of the liquid storage tank may be arranged on the bottom wall of the liquid storage tank, or the refrigerant outlet of the liquid storage tank may be arranged on the top wall of the liquid storage tank, and the refrigerant inlet of the liquid storage tank may be arranged on the circumferential side wall of the liquid storage tank, or the refrigerant outlet of the liquid storage tank may be arranged on the top wall of the liquid storage tank, and the refrigerant inlet of the liquid storage tank may be arranged on the bottom wall of the liquid storage tank.

[0075] Exemplarily, the ratio of the length of the line between the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank to the inner diameter of the liquid storage tank may be 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or 1, etc.

[0076] Optionally, the liquid storage device 700 includes a liquid storage tank, and the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third pipe segment 630 is in a range of 5 to 10.

[0077] In this embodiment, the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third pipe segment 630 is in the range of 5 to 10, and the inner diameter of the liquid storage tank is larger than the inner diameter of the third pipe segment 630. In this way, when the refrigerant in the third pipe segment 630 enters the liquid storage tank, the space increases, the pressure decreases, and part of the liquid refrigerant becomes a gas refrigerant to increase the content of the gaseous refrigerant in the liquid storage tank. Exemplarily, the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third pipe segment 630 can be 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, etc.

[0078] In some optional embodiments, such as Figures 2 to 5 As shown, the gas-liquid separation device for the heat exchange system also includes an air outlet pipe section 900, which includes a first air outlet pipe section 910 and a second air outlet pipe section 920 that are connected to each other. The first air outlet pipe section 910 is connected to the refrigerant outlet of the liquid storage tank, and the inner diameter of the second air outlet pipe section 920 is smaller than the inner diameter of the first air outlet pipe section 910.

[0079] In this embodiment, the air outlet pipe section 900 includes a first air outlet pipe section 910 and a second air outlet pipe section 920 which are connected to each other. The first air outlet pipe section 910 is connected to the refrigerant outlet of the liquid storage tank, and the second air outlet pipe section 920 is used to be connected to the return pipe 800. The refrigerant outlet of the liquid storage tank is connected to the return pipe 800 through the air outlet pipe section 900. In this way, the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank can flow into the return pipe 800 after passing through the first air outlet pipe section 910 and the second air outlet pipe section 920. The inner diameter of the second air outlet pipe section 920 is smaller than the inner diameter of the first air outlet pipe section 910. The second air outlet pipe section 920 can play a throttling role and can throttle a small amount of liquid refrigerant mixed in the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank, so that the small amount of liquid refrigerant is converted into a gas-liquid two-phase refrigerant, thereby further improving the dryness of the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank and improving the gas-liquid separation effect of the gas-liquid separation device used in the heat exchange system.

[0080] In some optional embodiments, the ratio of the inner diameter of the first air outlet pipe segment 910 to the inner diameter of the second air outlet pipe segment 920 ranges from 3.8 to 5.4.

[0081] In this embodiment, the ratio of the inner diameter of the first air outlet pipe section 910 to the inner diameter of the second air outlet pipe section 920 is in the range of 3.8 to 5.4. In this way, when the gaseous refrigerant flows through the first air outlet pipe section 910 and the second air outlet pipe section 920, the second air outlet pipe section 920 can throttle a small amount of liquid refrigerant mixed in the gaseous refrigerant, thereby improving the gas-liquid separation effect.

[0082] Optionally, the ratio of the inner diameter of the first air outlet pipe section 910 to the inner diameter of the second air outlet pipe section 920 may be 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, 5.2 or 5.4.

[0083] Exemplarily, the ratio of the transverse length of the liquid storage tank to the inner diameter of the second air outlet pipe section 920 ranges from 27 to 30.

[0084] In this embodiment, the ratio of the transverse length of the liquid storage tank to the inner diameter of the second air outlet pipe section 920 is in a range of 27 to 30. In this way, when the gaseous refrigerant flows through the second air outlet pipe section 920, the flow rate of the gaseous refrigerant in the second air outlet pipe section 920 is further increased, so that the second air outlet pipe section 920 can throttle a small amount of liquid refrigerant mixed in the gaseous refrigerant, thereby improving the gas-liquid separation effect.

[0085] Optionally, the ratio of the radial length of the liquid storage tank to the inner diameter of the second air outlet pipe segment 920 may be 27, 27.5, 28, 28.5, 29, 29.5 or 30.

[0086] In some optional embodiments, such as Figure 1 As shown, the heat exchange system further includes a second throttling device 810 , and the second throttling device 810 is disposed on the return air pipe 800 .

[0087] In this embodiment, the second throttling device 810 is provided in the return air pipe 800, and the opening size of the second throttling device 810 can be adjusted to adjust the amount of gaseous refrigerant supplemented by the liquid storage device 700 to the return air port of the compressor 200 and the refrigerant storage capacity of the liquid storage device 700. In addition, the second throttling device 810 can also throttle the refrigerant flowing through, throttling the liquid refrigerant mixed in the gaseous refrigerant into gas-liquid refrigerant, so as to improve the dryness of the gaseous refrigerant supplemented to the compressor 200, reduce the liquid in the suction of the compressor 200, and improve the operating stability and service life of the compressor 200.

[0088] Optionally, the second throttling device 810 includes an electronic expansion valve.

[0089] Optionally, the heat exchange system further includes a solenoid valve 640 , which is disposed between the refrigerant inlet of the liquid storage device 700 and the third pipe section 630 .

[0090] In this embodiment, the solenoid valve 640 is arranged between the refrigerant inlet of the liquid storage device 700 and the third pipe section 630, so that the amount of refrigerant entering the liquid storage device 700 can be adjusted by adjusting the opening and closing and the opening size of the solenoid valve 640, so as to adjust the amount of refrigerant entering the liquid storage device 700 and further adjust the refrigerant storage capacity of the liquid storage device 700.

[0091] Fig. 9 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.

[0092] S001, the controller obtains the operating parameters of the heat exchange system.

[0093] S002, according to the operating parameters of the heat exchange system, the controller adjusts the refrigerant storage capacity of the liquid storage device.

[0094] In this embodiment, the controller can obtain the operating parameters of the heat exchange system, and according to the operating parameters of the heat exchange system, the controller can adjust the refrigerant storage capacity of the liquid storage device, that is, the controller can adjust the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit to increase or decrease the amount of refrigerant participating in the heat exchange cycle, thereby improving the rationality of refrigerant charging of the heat exchange system under different working conditions and improving the performance of the heat exchange system.

[0095] In some optional embodiments, the operating parameters of the compressor include the operating load of the compressor. According to the operating parameters of the compressor, adjusting the refrigerant storage capacity of the liquid storage device includes: when the operating load of the compressor is a high operating load, reducing the refrigerant storage capacity of the liquid storage device; when the operating load of the compressor is a low load operation, increasing the refrigerant storage capacity of the liquid storage device.

[0096] In this embodiment, when the compressor is at a high operating load, the heat exchange amount 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 refrigerant storage capacity of the liquid storage device can be reduced, and the refrigerant is returned 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.

[0097] When the compressor is at a low operating 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 compressor is at a low operating load. At this time, the refrigerant storage capacity of the liquid storage device can be increased, the amount of refrigerant involved in the heat exchange cycle in the heat exchange circuit 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.

[0098] In some optional embodiments, increasing the refrigerant storage capacity of the liquid storage device includes: the controller controls the electromagnetic valve and the second throttling device to be opened, and the opening of the electromagnetic valve is greater than the opening of the second throttling device. Reducing the refrigerant storage capacity of the liquid storage device includes: the controller controls the electromagnetic valve and the second throttling device to be opened, and the opening of the electromagnetic valve is less than the opening of the second throttling device.

[0099] In this embodiment, the third pipe section and the liquid storage device are provided with a solenoid valve, and the return air pipe is provided with a second throttling device. When the refrigerant storage capacity of the liquid storage device is increased, the solenoid valve and the second throttling device can be adjusted so that both the solenoid valve and the second throttling device are opened, and the opening of the solenoid valve is greater than the opening of the second throttling device, so that the amount of refrigerant flowing through the solenoid valve is greater than the amount of refrigerant flowing through the second throttling device, thereby storing the refrigerant in the liquid storage device and increasing the refrigerant storage capacity of the liquid storage device. When the refrigerant storage capacity of the liquid storage device is reduced, the solenoid valve and the second throttling device can also be adjusted so that both the solenoid valve and the second throttling device are opened, and the opening of the solenoid valve is less than the opening of the second throttling device. In this way, the amount of refrigerant flowing through the solenoid valve is less than the amount of refrigerant flowing through the second throttling device, so that the outflow of refrigerant in the liquid storage device is greater than the inflow of refrigerant in the liquid storage device, so as to reduce the amount of refrigerant in the liquid storage device. Furthermore, when the amount of refrigerant in the liquid storage device is increased or decreased, the second throttling device can be opened to increase the return air volume and exhaust air volume of the compressor and improve the working efficiency of the compressor.

[0100] Fig.10 It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

[0101] S011, the controller obtains the compressor operating parameters.

[0102] The operating parameters of the compressor include the operating frequency of the compressor and the exhaust pressure of the compressor.

[0103] Optionally, when the operating frequency of the compressor is greater than or equal to a first preset frequency, the compressor is determined to be at a high operating load. When the operating frequency of the compressor is less than a second preset frequency, the compressor is determined to be at a low operating load. Further, when the operating frequency of the compressor is less than the first preset frequency and the operating frequency of the compressor is greater than or equal to the second preset frequency, the compressor is determined to be at a normal operating load.

[0104] Optionally, when the operating load of the compressor is a normal operating load, the refrigerant storage amount of the liquid storage device is maintained unchanged, and the refrigerant storage amount is a first refrigerant storage amount; when the operating load of the compressor is a high operating load, the refrigerant storage amount of the liquid storage device is a second refrigerant storage amount; when the operating load of the compressor is a low operating load, the refrigerant storage amount of the liquid storage device is a third refrigerant storage amount. The third refrigerant storage amount is greater than the first refrigerant storage amount, and the first refrigerant storage amount is greater than the second refrigerant storage amount.

[0105] S012, according to the exhaust pressure of the compressor, the controller determines a first target opening of the second throttling device.

[0106] The controller can obtain the exhaust pressure of the compressor and determine the first target opening of the second throttling device according to the exhaust pressure of the compressor, thereby controlling the amount of air supplied from the liquid storage device to the compressor through the return air pipe.

[0107] The exhaust pressure of the compressor can be adjusted by the speed of the compressor and the return air volume of the compressor. In this embodiment, the first target opening of the second throttling device is adjusted by the exhaust pressure of the compressor, that is, the return air volume of the compressor is adjusted. In this way, the exhaust pressure of the compressor can be increased without increasing the speed of the compressor, so that the exhaust pressure of the compressor meets the requirements of the first preset exhaust pressure, the frequency of change of the speed of the compressor is reduced, the service life of the compressor is increased, and energy consumption is saved.

[0108] Optionally, when the exhaust pressure of the compressor is less than or equal to the first preset exhaust pressure and greater than the second preset exhaust pressure, the first target opening degree is determined to be the fifth opening degree.

[0109] When the exhaust pressure of the compressor is less than or equal to the second preset exhaust pressure, the first target opening is determined to be the sixth opening, wherein the sixth opening is greater than the fifth opening.

[0110] Optionally, when the exhaust pressure of the compressor is less than or equal to the first preset exhaust pressure, the first target opening is negatively correlated with the exhaust pressure of the compressor. When the exhaust pressure of the compressor is smaller, the opening value of the first target opening is larger. In this way, the return air volume of the compressor is further increased, and the exhaust pressure of the compressor is improved.

[0111] S013: Based on the first target opening, the controller determines a second target opening of the solenoid valve according to the operating frequency of the compressor.

[0112] The controller can obtain the operating frequency of the compressor and can increase or decrease the refrigerant storage amount in the liquid storage device according to the operating frequency of the compressor. The second target opening of the solenoid valve is determined according to the first target opening of the second throttling device and the operating frequency of the compressor, so that the refrigerant storage amount of the liquid storage device can be adjusted through the solenoid valve while the return air volume of the compressor is increased by the second throttling device, so as to increase or decrease the refrigerant storage amount in the liquid storage device according to the operating frequency of the compressor.

[0113] S014, the controller controls the second throttling device to operate at a first target opening, and controls the solenoid valve to operate at a second target opening.

[0114] Fig.11It is a flow chart of another control method for a heat exchange system provided in an embodiment of the present disclosure.

[0115] S021, the controller obtains the compressor operating parameters.

[0116] The operating parameters of the compressor include the operating frequency of the compressor and the exhaust pressure of the compressor.

[0117] S022, the controller determines a first target opening of the second throttling device according to the exhaust pressure of the compressor.

[0118] S023, the controller determines the theoretical liquid storage amount of the liquid storage device corresponding to the operating frequency of the compressor.

[0119] In this embodiment, the operating frequency of the compressor may correspond to the high and low operating loads of the compressor. When the operating frequency of the compressor is greater than or equal to the first preset frequency, the theoretical liquid storage volume is determined to be the first liquid storage volume. When the operating frequency of the compressor is less than the second preset frequency, the theoretical liquid storage volume is determined to be the second liquid storage volume. When the operating frequency of the compressor is less than the first preset frequency, and the operating frequency of the compressor is greater than or equal to the second preset frequency, the theoretical liquid storage volume is determined to be the third liquid storage volume. The second liquid storage volume is greater than the third liquid storage volume, and the third liquid storage volume is greater than the first liquid storage volume.

[0120] S024, the controller obtains the actual liquid storage amount of the liquid storage device.

[0121] S025, based on the first target opening, the controller determines a second target opening of the solenoid valve according to a difference in liquid storage between a theoretical liquid storage amount and an actual liquid storage amount.

[0122] In this embodiment, the controller can determine the difference between the theoretical liquid storage volume and the actual liquid storage volume, and determine the opening of the solenoid valve according to the difference in liquid storage volume. In addition, during the opening of the solenoid valve, the refrigerant in the liquid storage device does not only enter through the solenoid valve, but the refrigerant in the liquid storage device also replenishes air to the compressor through the second throttling device. In this way, when adjusting the difference in liquid storage volume, the opening of the solenoid valve must also be adjusted based on the first target opening of the second throttling device to reduce the difference in liquid storage volume and meet the air replenishment demand of the second throttling device to the compressor.

[0123] Optionally, when the first target opening is greater than or equal to a preset opening, and the liquid storage amount difference is greater than or equal to a preset liquid storage amount difference, the controller determines that the second target opening is the first opening.

[0124] When the first target opening is greater than or equal to the preset opening, and the liquid storage amount difference is less than the preset liquid storage amount difference, the controller determines the second target opening to be the second opening.

[0125] When the first target opening is smaller than the preset opening, and the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference, the controller determines that the second target opening is the third opening.

[0126] When the first target opening is smaller than the preset opening, and the liquid storage amount difference is smaller than the preset liquid storage amount difference, the controller determines the second target opening to be the fourth opening.

[0127] Among them, the first opening is greater than the second opening, the first opening is greater than the third opening, the third opening is greater than the fourth opening, and the second opening is greater than the fourth opening.

[0128] In this embodiment, the liquid storage volume difference refers to the difference between the theoretical liquid storage volume and the actual liquid storage volume. When the theoretical liquid storage volume is greater than the actual liquid storage volume, the liquid storage volume difference is a positive value, which means that the refrigerant storage volume of the liquid storage device needs to be increased. In this case, the preset liquid storage volume difference is also a positive value. In this way, the refrigerant storage volume in the liquid storage device when the liquid storage volume difference is greater than or equal to the preset liquid storage volume difference is less than the refrigerant storage volume in the liquid storage device when the liquid storage volume difference is less than the preset liquid storage volume difference.

[0129] When the theoretical liquid storage volume is less than the actual liquid storage volume, the liquid storage volume difference is a negative value, which means that the refrigerant storage volume of the liquid storage device needs to be reduced. In this case, the preset liquid storage volume difference is also a negative value. In this way, the refrigerant storage volume in the liquid storage device when the liquid storage volume difference is greater than or equal to the preset liquid storage volume difference is also less than the refrigerant storage volume in the liquid storage device when the liquid storage volume difference is less than the preset liquid storage volume difference.

[0130] In this embodiment, the second throttling device replenishes air to the compressor, so the refrigerant in the liquid storage device will continue to decrease. At this time, even if the actual liquid storage amount is greater than the theoretical liquid storage amount, refrigerant needs to be added to the liquid storage device to reduce the situation where the second throttling device replenishes air to the compressor, causing the actual liquid storage amount in the liquid storage device to be less than the theoretical liquid storage amount.

[0131] Taking the theoretical liquid storage volume as an example, when the first target opening is greater than or equal to the preset opening, and the liquid storage volume difference is greater than or equal to the preset liquid storage volume difference, it means that the second throttling device supplies a larger amount of air to the compressor, and the amount of refrigerant to be added to the liquid storage device is larger. When the first target opening is greater than or equal to the preset opening, and the liquid storage volume difference is greater than or equal to the preset liquid storage volume difference, it means that the second throttling device supplies a larger amount of air to the compressor, and the amount of refrigerant to be added to the liquid storage device is smaller. At this time, the first opening is made greater than the second opening to improve the refrigerant replenishment efficiency when the amount of refrigerant to be added is larger.

[0132] When the first target opening is less than the preset opening, and the liquid storage difference is greater than or equal to the preset liquid storage difference, it means that the air supply from the second throttling device to the compressor is small, and the amount of refrigerant to be added to the liquid storage device is large. At this time, the amount of refrigerant flowing out of the liquid storage device is small, and the third opening can be reduced accordingly, so that the third opening is smaller than the first opening.

[0133] When the first target opening is smaller than the preset opening, and the liquid storage difference is smaller than the preset liquid storage difference, it means that the air supply from the second throttling device to the compressor is small, and the amount of refrigerant to be added to the liquid storage device is small. At this time, the amount of refrigerant flowing out of the liquid storage device is small, and the fourth opening can be reduced accordingly, so that the fourth opening is smaller than the third opening, and the fourth opening can also be smaller than the second opening.

[0134] Furthermore, when the theoretical liquid storage volume is greater than or equal to the actual liquid storage volume, the preset liquid storage volume difference is negatively correlated with the first target opening;

[0135] When the theoretical liquid storage volume is less than the actual liquid storage volume, the preset liquid storage volume difference is positively correlated with the first target opening.

[0136] When the theoretical liquid storage volume is greater than or equal to the actual liquid storage volume, that is, when the liquid storage device needs to add refrigerant, the preset liquid storage volume difference is negatively correlated with the first target opening, that is, when the first target opening is larger, the preset liquid storage volume difference is smaller. In this way, when the second throttling device replenishes more air to the compressor, the preset liquid storage volume difference is reduced, so that the controller determines that the amount of refrigerant to be added in the liquid storage device is larger, so that the second target opening can be determined to be the first opening or the third opening. The opening of the solenoid valve is increased, and the liquid replenishment speed of the refrigerant regulating device is increased. When the first target opening is smaller, the preset liquid storage volume difference is larger. In this way, when the second throttling device replenishes less air to the compressor, the preset liquid storage volume difference is increased, so that the controller determines that the amount of refrigerant to be added in the liquid storage device is smaller, so that the second target opening can be determined to be the second opening or the fourth opening. The liquid storage demand of the liquid storage device can be met when the second target opening is smaller.

[0137] Optionally, the second target opening is calculated as follows:

[0138] S2=k1*ΔD+k2*S1.

[0139] Among them, S2 is the second target opening, k1 is the first adjustment coefficient, ΔD is the liquid storage difference, k2 is the second adjustment coefficient, and S1 is the first target opening.

[0140] In this embodiment, part of the refrigerant entering the liquid storage device through the solenoid valve is stored in the storage device, and the other part flows to the compressor through the second throttling device to replenish the compressor. Therefore, the second target opening of the solenoid valve is determined by the difference between the theoretical liquid storage amount and the actual liquid storage amount and the first target opening of the second throttling device.

[0141] Optionally, k2 is related to the inner diameter of the solenoid valve and the second throttling device. Since the inner diameters of the solenoid valve and the second throttling device are different, when the openings of the solenoid valve and the second throttling device are the same, the flow rates of the solenoid valve and the second throttling device may also be different. When the inner diameter of the solenoid valve is larger than the inner diameter of the second throttling device, k2 is less than 1. When the inner diameter of the solenoid valve is larger than the inner diameter of the second throttling device, k2 is greater than 1. Further, k2 is the ratio of the inner diameter of the second throttling device to the inner diameter of the solenoid valve.

[0142] S026, the controller controls the second throttling device to operate at the first target opening, and controls the solenoid valve to operate at the second target opening.

[0143] Combination Fig.12 As 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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 system body. 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.

[0148] 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.

[0149] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0150] 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), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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 heat exchange system, comprising a heat exchange circuit, the heat exchange circuit comprising a compressor, an outdoor heat exchanger, a first throttling device and an indoor heat exchanger connected in sequence, characterized in that: The heat exchange system also includes: The three-way pipe comprises a first pipe section, a second pipe section and a third pipe section which are connected to each other, wherein the first pipe section is connected to the first throttling device, and the second pipe section is connected to the heat exchanger; wherein the heat exchanger is an outdoor heat exchanger or an indoor heat exchanger; A liquid storage device, wherein the refrigerant inlet of the liquid storage device is connected to the third pipe section, and the three-way pipe can separate the gas refrigerant and the liquid refrigerant in the refrigerant flowing through the first throttling device, and the gas refrigerant can flow into the liquid storage device through the third pipe section; The air return pipe is connected between the refrigerant outlet of the liquid storage device and the air return port of the compressor.

2. The heat exchange system according to claim 1, characterized in that: The third pipe section is arranged above the second pipe section, and there is a fold angle between the third pipe section and the first pipe section.

3. The heat exchange system according to claim 2, characterized in that: The opening of the corner is upward, and the angle of the corner is in the range of 30 to 70 degrees; and / or, The extending direction of the second pipe section is the same as the extending direction of the third pipe section.

4. The heat exchange system according to claim 1, characterized in that: The liquid storage device includes a liquid storage tank, the refrigerant outlet of the liquid storage device is connected to the refrigerant outlet of the liquid storage tank, and the refrigerant inlet of the liquid storage device is connected to the refrigerant inlet of the liquid storage tank; The refrigerant outlet of the liquid storage tank is arranged at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the lower end of the liquid storage tank; and / or, Along the radial direction of the liquid storage tank, the refrigerant outlet of the liquid storage tank is arranged at one end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at the other end of the liquid storage tank.

5. The heat exchange system according to claim 4, characterized in that: Along the axial direction of the liquid storage tank, the ratio of the length between the refrigerant outlet of the liquid storage tank and the top wall of the liquid storage tank to the axial length of the liquid storage tank ranges from 0 to 0.1; and / or, Along the axial direction of the liquid storage tank, the ratio of the length between the refrigerant inlet of the liquid storage tank and the bottom wall of the liquid storage tank to the axial length of the liquid storage tank ranges from 0 to 0.

1.

6. The heat exchange system according to claim 4, characterized in that: Along the radial direction of the liquid storage tank, the ratio of the length of the line between the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank to the inner diameter of the liquid storage tank is in the range of 0.6 to 1.

7. The heat exchange system according to claim 1, characterized in that: The liquid storage device comprises a liquid storage tank, and the ratio between the inner diameter of the liquid storage tank and the inner diameter of the third pipe section is in a range of 5 to 10.

8. The heat exchange system according to any one of claims 1 to 7, characterized in that: Also includes: A second throttling device is provided on the return air pipe; and / or, The solenoid valve is arranged between the refrigerant inlet of the liquid storage device and the third pipe section.

9. A control method for a heat exchange system, characterized in that: The heat exchange system is the heat exchange system according to any one of claims 1 to 8, and the control method comprises: Obtaining operating parameters of the heat exchange system; According to the operating parameters of the heat exchange system, the refrigerant storage capacity of the liquid storage device is adjusted.

10. A control device for a heat exchange system, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for a heat exchange system according to claim 9 when running the program instructions.

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