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

Abstract

The application relates to the technical field of heat exchange systems, and discloses a heat exchange system, a control method and device for the heat exchange system. The heat exchange system comprises a heat exchange circuit, and further comprises a three-way pipe, a liquid storage device and a back gas pipe. The three-way pipe comprises a first pipe section, a second pipe section and a third pipe section which are connected in communication. The first pipe section is connected in communication with a first throttling device, and the second pipe section is connected in communication with a heat exchanger. The heat exchanger is an outdoor heat exchanger or an indoor heat exchanger. The refrigerant inlet of the liquid storage device is connected in communication with the third pipe section. The three-way pipe can separate gaseous refrigerant and 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. The back gas pipe is connected between the refrigerant outlet of the liquid storage device and the back gas inlet of a compressor. The embodiment can adjust the amount of refrigerant participating in the heat exchange cycle, improve the rationality of the amount of refrigerant participating in the heat exchange cycle, and improve the heat exchange efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat exchange systems, for example to a heat exchange system, a control method and device for the heat exchange system. BACKGROUND

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

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

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

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

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

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

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

[0009] According to the first aspect of the present application, a heat exchange system is provided, the 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, the heat exchange system further comprising: a three-way pipe comprising a first pipe section, a second pipe section and a third pipe section in communication, the first pipe section being in communication with the first throttling device, the second pipe section being in communication with the heat exchanger; wherein the heat exchanger is the outdoor heat exchanger or the indoor heat exchanger; a liquid storage device, a refrigerant inlet of the liquid storage device being in communication with the third pipe section, the three-way pipe being capable of separating gaseous refrigerant and liquid refrigerant in the refrigerant flowing through the first throttling device, the gaseous refrigerant being capable of flowing into the liquid storage device through the third pipe section; a gas return pipe being connected between a refrigerant outlet of the liquid storage device and a gas return port of the compressor.

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

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

[0012] In some optional embodiments, the liquid storage device comprises a liquid storage tank, the refrigerant outlet of the liquid storage device is in communication with the refrigerant outlet of the liquid storage tank, and the refrigerant inlet of the liquid storage device is in communication with 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 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 ranges from 0 to 0.1; and / or,

[0015] Along the axial direction of the liquid storage tank, 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 ranges from 0 to 0.1.

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

[0017] In some optional embodiments, 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 ranges from 5 to 10.

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

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

[0020] According to the 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 as described above, and the control method comprises: obtaining an operating parameter of the heat exchange system; and adjusting a refrigerant storage capacity of the liquid storage device according to the operating parameter of the heat exchange system.

[0021] According to the 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, the processor is configured to execute the control method for the heat exchange system as described above when the program instructions are executed.

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

[0023] The first pipe section is in communication with the first throttling device, the second pipe section is in communication with the heat exchanger, and the third pipe section is in communication with the liquid storage device. That is, when the refrigerant flows through the tee pipe, the refrigerant can flow to the liquid storage device through the tee pipe, so that the liquid storage device can store the refrigerant, the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit is reduced, the rationality of the amount of refrigerant participating in the heat exchange cycle is improved, and the heat exchange efficiency is improved. Moreover, the tee 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 back gas pipe is connected between the refrigerant outlet of the liquid storage device and the back gas inlet of the compressor. In this way, the gaseous refrigerant in the liquid storage device can flow back to the back gas inlet of the compressor through the back gas pipe to supplement the gas and increase the heat of the compressor, thereby increasing the back gas amount of the compressor and improving the heating capacity of the compressor. Moreover, the refrigerant in the liquid storage device can also flow out of the liquid storage device through the back gas 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. The embodiment can adjust the amount of refrigerant participating in the heat exchange cycle, improve the rationality of the amount of refrigerant participating in the heat exchange cycle, and improve the heat exchange efficiency.

[0024] The foregoing general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] One or more embodiments are exemplarily illustrated by corresponding drawings, which are not used to limit the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute proportional limitation, and wherein:

[0026] Figure 1 is a structural schematic diagram of a heat exchange system provided by the embodiments of the present application;

[0027] Figure 2 is a structure schematic diagram of a connection between a tee pipe and a liquid storage device provided by an embodiment of the present disclosure;

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

[0029] Figure 4 is still another structure schematic diagram of a connection between a tee pipe and a liquid storage device provided by an embodiment of the present disclosure;

[0030] Figure 5 is still another structure schematic diagram of a connection between a tee pipe and a liquid storage device provided by an embodiment of the present disclosure;

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

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

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

[0034] Figure 9 is a flow schematic diagram of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0035] Figure 10 is another flow schematic diagram of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0036] Figure 11 is still another flow schematic diagram of a control method for a heat exchange system provided by an embodiment of the present disclosure;

[0037] Figure 12 is a structure schematic diagram of a control device for a heat exchange system provided by an embodiment of the present disclosure.

[0038] Reference signs:

[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, tee pipe; 610, first pipe section; 620, second pipe section; 630, third pipe section; 640, electromagnetic valve; 700, liquid storage device; 800, gas return pipe; 810, second throttling device; 900, gas outlet pipe section; 910, first gas outlet pipe section; 920, second gas outlet pipe section. DETAILED DESCRIPTION

[0040] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below, and the accompanying drawings are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0041] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0042] In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "back", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0043] In addition, the terms "set", "connected", "fixed" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally configured; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the present disclosure can be understood according to the specific circumstances.

[0044] The term "and / or" is a description of the association relationship of the object, which means that there can be three relationships. For example, A and / or B means: A or B, or, A and B, the three relationships.

[0045] It should be noted that the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0046] This 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 connected in sequence.

[0047] When the heat exchange system is operating in cooling mode, the refrigerant flows out of the compressor 200, passes sequentially through the outdoor heat exchanger 300, the first throttling device 400, and the indoor heat exchanger 500, and then flows back into the compressor 200 to complete one refrigeration cycle. At this time, the outdoor heat exchanger 300 acts as a condenser, where the refrigerant condenses and releases heat. The indoor heat exchanger 500 acts as an evaporator, where the refrigerant evaporates and absorbs heat from the room, providing cooling capacity and lowering the indoor temperature.

[0048] When the heat exchange system is operating in heating mode, the refrigerant flows out of the compressor 200, passes sequentially through the indoor heat exchanger 500, the first throttling device 400, and the outdoor heat exchanger 300, and then flows back into the compressor 200 to complete one heating cycle. At this time, the indoor heat exchanger 500 acts as a condenser, where the refrigerant condenses and releases heat to increase the indoor temperature. The outdoor heat exchanger 300 acts as an evaporator, where the refrigerant evaporates and absorbs heat, becoming gaseous refrigerant which is then 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. 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. The heat exchanger is either 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 gaseous refrigerant and liquid refrigerant flowing through the first throttling device 400, allowing the gaseous refrigerant to flow into the liquid storage device 700 through the third pipe section 630. The return pipe 800 connects the refrigerant outlet of the liquid storage device 700 and the return port of the compressor 200.

[0050] In this embodiment, the first pipe section 610 is in communication with the first throttling device 400, and the second pipe section 620 is in communication with 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 the 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 section 610, the second pipe section 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 section 620, the first pipe section 610, and the first throttling device 400 in sequence.

[0051] With this optional embodiment, the first pipe section 610 is in communication with the first throttling device 400, the second pipe section 620 is in communication with the heat exchanger, and the third pipe section 630 is in communication with the liquid storage device 700. That is, 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 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 port of the compressor 200. In this way, the gaseous refrigerant in the liquid storage device 700 can flow back to the return port of the compressor 200 through the return pipe 800 to supplement the gas and increase the heat of the compressor 200, thereby increasing the return amount of the compressor 200 and improving 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 pipe 800, 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, improve the rationality of the amount of refrigerant participating in the heat exchange cycle, and improve the heat exchange efficiency.

[0052] Optionally, as shown in Figures 2 to 5 The third pipe section 630 is arranged above the second pipe section 620, and there is an angle between the third pipe section 630 and the first pipe section 610.

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

[0054] In this embodiment, the refrigerant can be separated into gas and liquid when flowing out of the tee pipe 600 through the first pipe section 610, to increase the amount of gaseous refrigerant flowing into the liquid storage device 700, thereby increasing the dryness of the refrigerant provided by the liquid storage device 700 to the gas return port of the compressor 200 through the gas return pipe 800, reducing the amount of liquid refrigerant flowing into the compressor 200, and improving the service life and operating stability of the compressor 200.

[0055] Further, the extension direction of the second pipe section 620 is the same as the extension direction of the third pipe section 630.

[0056] With the optional embodiment, the extension direction of the second pipe section 620 is the same as the extension direction of the third pipe section 630, that is, the first pipe section 610 and the second pipe section 620 are arranged in a straight line. In this way, when the gas-liquid two-phase refrigerant flows to the connection of the first pipe section 610, the second pipe section 620 and the third pipe section 630, the gas-liquid two-phase refrigerant can collide with the inner wall of the second pipe section 620 and the inner wall of the third pipe section 630. Compared with the scheme in which the extension directions of the second pipe section 620 and the third pipe section 630 are different, the present embodiment can increase the area of collision between the gas-liquid two-phase refrigerant and the inner wall of the three pipe sections at the connection of the three pipe sections, and enable the gaseous refrigerant to move upward without passing through the angle, thereby increasing the amount of gaseous refrigerant flowing into the liquid storage device 700.

[0057] Further, the opening of the angle is upward, and the angle of the angle ranges from 30 to 70 degrees.

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

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

[0060] In some alternative embodiments, the liquid storage device 700 includes a liquid storage tank, the refrigerant outlet of the liquid storage device 700 is in communication with the refrigerant outlet of the liquid storage tank, the refrigerant inlet of the liquid storage device 700 is in communication with 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 in communication with the refrigerant outlet of the liquid storage tank, and the return gas pipe 800 is in communication with the refrigerant outlet of the liquid storage device 700, so that the return gas pipe 800 is in communication with the refrigerant outlet of the liquid storage tank. The refrigerant inlet of the liquid storage device 700 is in communication with the refrigerant inlet of the liquid storage tank, and the refrigerant inlet of the liquid storage device 700 is in communication with the third pipe section 630, so that the third pipe section 630 is in communication with the refrigerant inlet of the liquid storage tank.

[0061] For example, the refrigerant outlet of the liquid storage tank is provided at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is provided at the lower end of the liquid storage tank.

[0062] In this embodiment, the gaseous refrigerant in the liquid storage tank is located in the upper part of the liquid storage tank, and the liquid refrigerant is located in the lower part of the liquid storage tank. The refrigerant outlet of the liquid storage tank is in communication with the return gas pipe 800, and the liquid storage tank provides gaseous refrigerant to the compressor 200 through the return gas pipe 800. The refrigerant outlet of the liquid storage tank is provided at the upper end of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is provided 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 gas pipe 800 can be improved, i.e. the amount of gaseous refrigerant flowing into the return gas pipe 800 is increased, the liquid return of the compressor 200 is reduced, and the service life and operating stability of the compressor 200 are improved. Figure 6A simulation diagram of a three-way pipe 600 and a liquid storage device 700 connection embodiment is shown, so 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 along the direction from the bottom to the top of the liquid storage device 700.

[0063] Further, 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] In the case where 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 is 0, the refrigerant outlet of the liquid storage tank is provided at the top wall of the liquid storage tank. In the case where 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 provided 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 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 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, 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.

[0066] In the case where 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 is 0, the refrigerant inlet of the liquid storage tank is provided at the bottom wall of the liquid storage tank. In the case where 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 provided 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 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 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] Optionally, as 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 along the radial direction of the liquid storage tank. Due to the impact of the refrigerant in the three-way pipe 600, not only gaseous refrigerant can flow into the liquid storage tank through the third pipe segment 630, but also a small amount of liquid refrigerant can flow into the liquid storage tank through the third pipe segment 630. During the process of flowing into and flowing out of the liquid storage tank, the flow direction of the refrigerant changes, thereby increasing the storage time of the same refrigerant in the liquid storage tank, 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] Optionally, as shown, Figure 4 As 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 along the radial direction of the liquid storage tank. Due to the impact of the refrigerant in the three-way pipe 600, not only gaseous refrigerant can flow into the liquid storage tank through the third pipe segment 630, but also a small amount of liquid refrigerant can flow into the liquid storage tank through the third pipe segment 630. During the process of flowing into and flowing out of the liquid storage tank, the flow direction of the refrigerant changes, thereby increasing the storage time of the same refrigerant in the liquid storage tank, 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 arranged at opposite ends of the liquid storage tank, respectively. And the refrigerant inlet of the liquid storage tank and the refrigerant outlet of the liquid storage tank are arranged at the upper end of the liquid storage tank and the lower end of the liquid storage tank, respectively. That is, the refrigerant inlet of the liquid storage tank and the refrigerant outlet of the liquid storage tank are arranged diagonally in the liquid storage tank. In this way, the situation that the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank are arranged on a straight line along the axial direction of the liquid storage tank can be reduced. 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 action of the refrigerant outlet of the liquid storage tank above, thereby reducing the time of the refrigerant in the liquid storage tank, reducing the gas-liquid separation effect of the refrigerant, and reducing the dryness of the refrigerant flowing out of the liquid storage tank.

[0071] Figure 7Another simulation diagram of the connection between the tee pipe 600 and the liquid storage device 700 is 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 top wall of the liquid storage tank. Along the radial direction of the liquid storage tank, the refrigerant inlet and the refrigerant outlet of the liquid storage tank are arranged at two ends of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a movement trend along the axial direction of the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows along the radial direction of the liquid storage tank. During the process of flowing into and flowing out of the liquid storage tank, the flow direction of the refrigerant changes, the flow path of the refrigerant 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 tee pipe 600 through the first pipe segment 610, and when the refrigerant flows out of the liquid storage tank through the refrigerant outlet of the liquid storage tank, the dryness of the refrigerant can be increased to 0.6.

[0072] Figure 8 Another simulation diagram of the connection between the tee pipe 600 and the liquid storage device 700 is 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 top wall of the liquid storage tank. Along the radial direction of the liquid storage tank, the refrigerant inlet and the refrigerant outlet of the liquid storage tank are arranged at two ends of the liquid storage tank. In this way, when the refrigerant flows into the liquid storage tank, the refrigerant has a movement trend along the axial direction of the liquid storage tank. When the refrigerant flows out of the liquid storage tank, the refrigerant flows along the radial direction of the liquid storage tank. During the process of flowing into and flowing out of the liquid storage tank, the flow direction of the refrigerant changes, the flow path of the refrigerant 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 tee pipe 600 through the first pipe segment 610, and when the refrigerant flows out of the liquid storage tank through the refrigerant outlet of the liquid storage tank, the dryness of the refrigerant can be increased to 0.6.

[0073] Further, 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 ranges from 0.6 to 1.

[0074] In the case where 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 arranged at the circumferential side wall of the liquid storage tank. In the case where the ratio is greater than or equal to 0.6 and less than 1, the refrigerant outlet of the liquid storage tank can be arranged at the circumferential side wall of the liquid storage tank, and the refrigerant inlet of the liquid storage tank can be arranged at the bottom wall of the liquid storage tank, or the refrigerant outlet of the liquid storage tank can be arranged at the top wall of the liquid storage tank, and the refrigerant inlet of the liquid storage tank can be arranged at the circumferential side wall of the liquid storage tank, or the refrigerant outlet of the liquid storage tank can be arranged at the top wall of the liquid storage tank, and the refrigerant inlet of the liquid storage tank can be arranged at the bottom wall of the liquid storage tank.

[0075] Exemplarily, the ratio of the length of the connection 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 can 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 comprises a liquid storage tank, and the ratio of the inner diameter of the liquid storage tank to the inner diameter of the third pipe segment 630 ranges from 5 to 10.

[0077] In this embodiment, the ratio of the inner diameter of the liquid storage tank to the inner diameter of the third pipe segment 630 ranges from 5 to 10, and the inner diameter of the liquid storage tank is greater 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 gaseous refrigerant, so as to increase the content of gaseous refrigerant in the liquid storage tank. Exemplarily, the ratio of the inner diameter of the liquid storage tank to 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, as shown in Figures 2 to 5 The gas-liquid separation device for the heat exchange system further comprises a gas outlet pipe segment 900, the gas outlet pipe segment 900 comprises a first gas outlet pipe segment 910 and a second gas outlet pipe segment 920 connected in communication, the first gas outlet pipe segment 910 communicates with the refrigerant outlet of the liquid storage tank, and the inner diameter of the second gas outlet pipe segment 920 is smaller than that of the first gas outlet pipe segment 910.

[0079] In this embodiment, the gas outlet pipe segment 900 comprises a first gas outlet pipe segment 910 and a second gas outlet pipe segment 920 connected in communication, the first gas outlet pipe segment 910 communicates with the refrigerant outlet of the liquid storage tank, and the second gas outlet pipe segment 920 is used to communicate with the gas return pipe 800, so that the refrigerant outlet of the liquid storage tank communicates with the gas return pipe 800 through the gas outlet pipe segment 900. In this way, the gaseous refrigerant flowing out of the refrigerant outlet of the liquid storage tank can flow into the gas return pipe 800 through the first gas outlet pipe segment 910 and the second gas outlet pipe segment 920. The inner diameter of the second gas outlet pipe segment 920 is smaller than that of the first gas outlet pipe segment 910, so that the second gas outlet pipe segment 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 as to make the small amount of liquid refrigerant become gaseous-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 for the heat exchange system.

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

[0081] In this embodiment, the ratio of the inner diameter of the first gas outlet pipe section 910 to the inner diameter of the second gas outlet pipe section 920 ranges from 3.8 to 5.4, so that the second gas outlet pipe section 920 can throttle the small amount of liquid refrigerant mixed in the gaseous refrigerant to improve the gas-liquid separation effect when the gaseous refrigerant flows through the first gas outlet pipe section 910 and the second gas outlet pipe section 920.

[0082] Optionally, the ratio of the inner diameter of the first gas outlet pipe section 910 to the inner diameter of the second gas outlet pipe section 920 can 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 gas 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 gas outlet pipe section 920 ranges from 27 to 30. In this way, when the gaseous refrigerant flows through the second gas outlet pipe section 920, the flow rate of the gaseous refrigerant in the second gas outlet pipe section 920 is further increased, so that the second gas outlet pipe section 920 can throttle the small amount of liquid refrigerant mixed in the gaseous refrigerant to improve 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 gas outlet pipe section 920 can be 27, 27.5, 28, 28.5, 29, 29.5, or 30.

[0086] In some optional embodiments, as shown in Figure 1 The heat exchange system further includes a second throttling device 810, which is arranged in the gas return pipe 800.

[0087] In this embodiment, the second throttling device 810 is arranged in the gas return pipe 800, and the opening size of the second throttling device 810 can be adjusted to adjust the amount of gaseous refrigerant supplied to the gas inlet of the compressor 200 by the liquid storage device 700 and the refrigerant storage capacity of the liquid storage device 700. Moreover, the second throttling device 810 can also throttle the refrigerant flowing therethrough to throttle the liquid refrigerant mixed in the gaseous refrigerant into gaseous refrigerant, so as to improve the dryness of the gaseous refrigerant supplied to the compressor 200, reduce the liquid suction of the compressor 200, and improve the operation 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 arranged between the refrigerant inlet of the liquid storage device 700 and the third pipe section 630.

[0090] In this embodiment, the electromagnetic valve 640 is arranged between the refrigerant inlet of the liquid storage device 700 and the third pipe section 630. In this way, the amount of refrigerant entering the liquid storage device 700 can be adjusted according to the opening and closing and the opening degree of the electromagnetic valve 640, so as to adjust the amount of refrigerant entering the liquid storage device 700 and further adjust the refrigerant storage amount of the liquid storage device 700.

[0091] Figure 9 is a flowchart of a control method for a heat exchange system provided by an embodiment of the present disclosure. The control method for the heat exchange system can be executed in a controller of the heat exchange system.

[0092] S001, the controller acquires an operating parameter of the heat exchange system.

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

[0094] In this embodiment, the controller can acquire the operating parameter of the heat exchange system, and according to the operating parameter of the heat exchange system, the controller can adjust the refrigerant storage amount 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, so as 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 parameter of the compressor includes an operating load of the compressor. According to the operating parameter of the compressor, adjusting the refrigerant storage amount of the liquid storage device includes: in the case that the operating load of the compressor is a high operating load, decreasing the refrigerant storage amount of the liquid storage device; in the case that the operating load of the compressor is a low load operation, increasing the refrigerant storage amount of the liquid storage device.

[0096] In this embodiment, when the compressor is in a high operating load, the heat exchange amount of the heat exchange system increases, and the amount of refrigerant participating in the heat exchange cycle required by the heat exchange system increases. At this time, the refrigerant storage amount of the liquid storage device can be decreased, so that the refrigerant returns to the heat exchange circuit through the compressor, thereby increasing the amount of refrigerant participating in the heat exchange cycle, and improving the performance of the heat exchange system.

[0097] When the compressor is in a low operating load, the heat exchange amount of the heat exchange system decreases. The amount of refrigerant participating in the heat exchange cycle can be decreased, and a smaller amount of refrigerant can meet the heat exchange amount required by the heat exchange system when the compressor is in a low operating load. At this time, the refrigerant storage amount of the liquid storage device can be increased, and the amount of refrigerant participating in the heat exchange cycle in the heat exchange circuit can be decreased, so as to reduce the situation that more refrigerant participating in the heat exchange cycle increases energy consumption, thereby improving the heat exchange performance of the heat exchange system.

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

[0099] In the embodiment, the third pipe section and the liquid storage device are provided with the electromagnetic valve, and the gas return pipe is provided with the second throttling device. When increasing the refrigerant storage capacity of the liquid storage device, the electromagnetic valve and the second throttling device are adjusted so that the electromagnetic valve and the second throttling device are both opened, and the opening degree of the electromagnetic valve is greater than the opening degree of the second throttling device. In this way, the amount of refrigerant flowing through the electromagnetic valve is greater than the amount of refrigerant flowing through the second throttling device, so that the refrigerant is stored in the liquid storage device, and the refrigerant storage capacity of the liquid storage device is increased. When reducing the refrigerant storage capacity of the liquid storage device, the electromagnetic valve and the second throttling device can also be adjusted so that the electromagnetic valve and the second throttling device are both opened, and the opening degree of the electromagnetic valve is less than the opening degree of the second throttling device. In this way, the amount of refrigerant flowing through the electromagnetic valve is less than the amount of refrigerant flowing through the second throttling device, so that the outflow amount of the refrigerant in the liquid storage device is greater than the inflow amount of the refrigerant in the liquid storage device, so as to reduce the amount of refrigerant in the liquid storage device. Moreover, when increasing the refrigerant amount of the liquid storage device and reducing the refrigerant amount of the liquid storage device, the second throttling device is opened, the gas return amount and the exhaust amount of the compressor are increased, and the working efficiency of the compressor is improved.

[0100] Figure 10 FIG. 3 is a flow diagram of another control method for a heat exchange system according to an embodiment of the present disclosure.

[0101] S011, the controller acquires a running parameter of the compressor.

[0102] The running parameter of the compressor comprises a running frequency of the compressor and an exhaust pressure of the compressor.

[0103] Optionally, in a case where the running frequency of the compressor is greater than or equal to a first preset frequency, it is determined that the compressor is in a high running load. In a case where the running frequency of the compressor is less than a second preset frequency, it is determined that the compressor is in a low running load. Further, in a case where the running frequency of the compressor is less than the first preset frequency and the running frequency of the compressor is greater than or equal to the second preset frequency, it is determined that the compressor is in a normal running load.

[0104] Optionally, in a case where the running load of the compressor is the normal running load, the refrigerant storage capacity of the liquid storage device is maintained unchanged, and the refrigerant storage capacity is a first refrigerant storage capacity; in a case where the running load of the compressor is the high running load, the refrigerant storage capacity of the liquid storage device is a second refrigerant storage capacity; in a case where the running load of the compressor is the low running load, the refrigerant storage capacity of the liquid storage device is a third refrigerant storage capacity. The third refrigerant storage capacity is greater than the first refrigerant storage capacity, and the first refrigerant storage capacity is greater than the second refrigerant storage capacity.

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

[0106] The controller can obtain the discharge pressure of the compressor, and determine the first target opening degree of the second throttling device according to the discharge pressure of the compressor, so as to control the amount of gas supplement of the liquid storage device to the compressor through the gas return pipe.

[0107] The discharge pressure of the compressor can be adjusted by the rotation speed of the compressor and the gas return amount of the compressor. In this embodiment, the first target opening degree of the second throttling device is adjusted by the discharge pressure of the compressor, that is, the gas return amount of the compressor is adjusted. In this way, the discharge pressure of the compressor can be increased without increasing the rotation speed of the compressor, so that the discharge pressure of the compressor meets the demand of the first preset discharge pressure, the frequency of change of the rotation speed of the compressor is reduced, the service life of the compressor is improved, and energy consumption is saved.

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

[0109] When the discharge pressure of the compressor is less than or equal to the second preset discharge pressure, the first target opening degree is determined as the sixth opening degree. The sixth opening degree is greater than the fifth opening degree.

[0110] Optionally, when the discharge pressure of the compressor is less than or equal to the first preset discharge pressure, the first target opening degree is negatively correlated with the discharge pressure of the compressor. The smaller the discharge pressure of the compressor is, the greater the opening value of the first target opening degree is. In this way, the gas return amount of the compressor is further increased, and the discharge pressure of the compressor is increased.

[0111] S013, the controller determines the second target opening degree of the electromagnetic valve according to the operating frequency of the compressor based on the first target opening degree.

[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 degree of the electromagnetic valve is determined according to the first target opening degree of the second throttling device and the operating frequency of the compressor, so that the gas return amount of the compressor can be increased by the second throttling device, and the refrigerant storage amount in the liquid storage device can be adjusted by the electromagnetic valve 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 the first target opening degree, and controls the electromagnetic valve to operate at the second target opening degree.

[0114] Figure 11is a flowchart of another control method for a heat exchange system provided by the embodiments of the present disclosure.

[0115] S021, the controller acquires a compressor operating parameter.

[0116] The compressor operating parameter includes a compressor operating frequency and a compressor discharge pressure.

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

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

[0119] In this embodiment, the compressor operating frequency can correspond to high and low operating loads of the compressor. In the case where the compressor operating frequency is greater than or equal to a first preset frequency, the theoretical liquid storage amount is determined as a first liquid storage amount. In the case where the compressor operating frequency is less than a second preset frequency, the theoretical liquid storage amount is determined as a second liquid storage amount. In the case where the compressor operating frequency is less than the first preset frequency and greater than or equal to the second preset frequency, the theoretical liquid storage amount is determined as a third liquid storage amount. The second liquid storage amount is greater than the third liquid storage amount, and the third liquid storage amount is greater than the first liquid storage amount.

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

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

[0122] In this embodiment, the controller can determine the liquid storage amount difference between the theoretical liquid storage amount and the actual liquid storage amount, and determine the opening degree of the electromagnetic valve according to the liquid storage amount difference. Moreover, in the process of opening the electromagnetic valve, the refrigerant in the liquid storage device not only enters through the electromagnetic valve, but also enters the compressor through the second throttling device for recharging. In this way, when adjusting the liquid storage amount difference, the opening degree of the electromagnetic valve is also adjusted based on the first target opening degree of the second throttling device to reduce the liquid storage amount difference and meet the recharging demand of the second throttling device to the compressor.

[0123] Optionally, in the case where the first target opening degree is greater than or equal to a preset opening degree and the liquid storage amount difference is greater than or equal to a preset liquid storage amount difference, the controller determines the second target opening degree as the first opening degree.

[0124] In the case where the first target opening degree is greater than or equal to the preset opening degree and the liquid storage amount difference is less than the preset liquid storage amount difference, the controller determines the second target opening degree as the second opening degree.

[0125] In a case where the first target opening degree is less than the preset opening degree and the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference, the controller determines the second target opening degree as the third opening degree.

[0126] In a case where the first target opening degree is less than the preset opening degree and the liquid storage amount difference is less than the preset liquid storage amount difference, the controller determines the second target opening degree as the fourth opening degree.

[0127] The first opening degree is greater than the second opening degree, the first opening degree is greater than the third opening degree, the third opening degree is greater than the fourth opening degree, and the second opening degree is greater than the fourth opening degree.

[0128] In the embodiment, the liquid storage amount difference refers to a difference between the theoretical liquid storage amount and the actual liquid storage amount. In a case where the theoretical liquid storage amount is greater than the actual liquid storage amount, the liquid storage amount difference is positive, that is, it is necessary to increase the refrigerant storage amount of the liquid storage device. At this time, the preset liquid storage amount difference is also positive. In this way, the refrigerant storage amount in the liquid storage device in a case where the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference is less than the refrigerant storage amount in a case where the liquid storage amount difference is less than the preset liquid storage amount difference.

[0129] In a case where the theoretical liquid storage amount is less than the actual liquid storage amount, the liquid storage amount difference is negative, that is, it is necessary to reduce the refrigerant storage amount of the liquid storage device. At this time, the preset liquid storage amount difference is also negative. In this way, the refrigerant storage amount in the liquid storage device in a case where the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference is also less than the refrigerant storage amount in a case where the liquid storage amount difference is less than the preset liquid storage amount difference.

[0130] In the embodiment, the second throttling device supplements the compressor, and therefore 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, it is necessary to supplement the refrigerant in the liquid storage device to reduce the case where the actual liquid storage amount in the liquid storage device is less than the theoretical liquid storage amount due to the refrigerant supplement of the second throttling device to the compressor.

[0131] Taking a case where the theoretical liquid storage amount is greater than the actual liquid storage amount as an example, in a case where the first target opening degree is greater than or equal to the preset opening degree and the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference, it is indicated that the refrigerant supplement amount of the second throttling device to the compressor is relatively large, and the refrigerant amount to be increased in the liquid storage device is relatively large. In a case where the first target opening degree is greater than or equal to the preset opening degree and the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference, it is indicated that the refrigerant supplement amount of the second throttling device to the compressor is relatively large, and the refrigerant amount to be increased in the liquid storage device is relatively small. At this time, the first opening degree is greater than the second opening degree, so as to improve the refrigerant supplement efficiency when the refrigerant amount to be increased is relatively large.

[0132] In the case that the first target opening degree is less than the preset opening degree and the liquid storage amount difference is greater than or equal to the preset liquid storage amount difference, it is indicated that the second throttling device supplies less gas to the compressor and the liquid storage device needs to increase more refrigerant. At this time, the liquid storage device has less refrigerant flowing outwards, and the third opening degree can also be reduced accordingly, so that the third opening degree is less than the first opening degree.

[0133] In the case that the first target opening degree is less than the preset opening degree and the liquid storage amount difference is less than the preset liquid storage amount difference, it is indicated that the second throttling device supplies less gas to the compressor and the liquid storage device needs to increase less refrigerant. At this time, the liquid storage device has less refrigerant flowing outwards, and the fourth opening degree can also be reduced accordingly, so that the fourth opening degree is less than the third opening degree and the fourth opening degree can also be less than the second opening degree.

[0134] Further, in the case that the theoretical liquid storage amount is greater than or equal to the actual liquid storage amount, the preset liquid storage amount difference is negatively correlated with the first target opening degree;

[0135] In the case that the theoretical liquid storage amount is less than the actual liquid storage amount, the preset liquid storage amount difference is positively correlated with the first target opening degree.

[0136] In the case that the theoretical liquid storage amount is greater than or equal to the actual liquid storage amount, that is, in the case that the liquid storage device needs to supplement refrigerant, the preset liquid storage amount difference is negatively correlated with the first target opening degree, that is, when the first target opening degree is greater, the preset liquid storage amount difference is smaller. In this way, when the second throttling device supplies more gas to the compressor, the preset liquid storage amount difference is reduced, so that the case that the controller determines that the liquid storage device needs to increase more refrigerant increases, so as to increase the case that the second target opening degree is the first opening degree or the third opening degree, thereby increasing the opening degree of the electromagnetic valve and increasing the liquid supplementing speed of the refrigerant adjusting device. When the first target opening degree is smaller, the preset liquid storage amount difference is greater. In this way, when the second throttling device supplies less gas to the compressor, the preset liquid storage amount difference is increased, so that the case that the controller determines that the liquid storage device needs to increase less refrigerant increases, so as to increase the case that the second target opening degree is the second opening degree or the fourth opening degree, so that the second target opening degree can also be small to meet the liquid storage demand of the liquid storage device.

[0137] Optionally, the second target opening degree is calculated in the following manner:

[0138] S2=k1*ΔD+k2*S1.

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

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

[0141] Optionally, k2 is related to the inner diameters of the electromagnetic valve and the second throttling device. Since the inner diameters of the electromagnetic valve and the second throttling device are different, the flow rates of the electromagnetic valve and the second throttling device can also be different when the opening degrees of the electromagnetic valve and the second throttling device are the same. In the case where the inner diameter of the electromagnetic valve is greater than the inner diameter of the second throttling device, k2 is less than 1. In the case where the inner diameter of the electromagnetic valve is greater 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 electromagnetic valve.

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

[0143] In combination Figure 12 As shown in the figure, the embodiment of the present disclosure provides a control device for a heat exchange system, which comprises a processor 100 and a memory 101. Optionally, the control device can further comprise a communication interface 102 and a bus 103. Wherein the processor 100, the communication interface 102 and the memory 101 can complete the communication among each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 can call the logical instructions in the memory 101 to execute the control method for the heat exchange system in the above-mentioned embodiment.

[0144] In addition, the logical instructions in the memory 101 described above can be realized in the form of a software function unit and sold or used as an independent product, which can be stored in a computer readable storage medium.

[0145] The memory 101 as a kind of computer readable storage medium can be used to store software programs, computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 100 executes the program instructions / modules stored in the memory 101, thereby executing function application and data processing, i.e. realizing the control method for the heat exchange system in the above-mentioned embodiment.

[0146] The memory 101 can include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application program required by at least one function; and the data storage area can store data created according to use of the terminal device, etc. In addition, the memory 101 can include a high-speed random access memory, and can also include a nonvolatile memory.

[0147] The heat exchange system provided by the embodiment of the present disclosure further comprises the control device for the heat exchange system described above. The control device for the heat exchange system is installed on the body of the heat exchange system. The installation relationship described herein is not limited to being placed in the product, but also includes installation connection with other components of the product, including but not limited to physical connection, electrical connection or signal transmission connection, etc. Those skilled in the art can understand that the control device for the heat exchange system can be adapted to the feasible product body, and thus realize other feasible embodiments.

[0148] The embodiment of the present disclosure provides a computer readable storage medium, which stores computer executable instructions, and the computer executable instructions are configured to execute the control method for the heat exchange system.

[0149] The computer readable storage medium described above can be a transitory 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. The computer software product is stored in a storage medium and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. various media that can store program codes, or can be a transitory storage medium.

[0151] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0152] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0153] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.), can be implemented in other manners. For example, the described apparatus embodiments can be implemented only in a form of a logical function, and can be implemented by using a manner such as software (for example, application program) or the like. In some embodiments, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or indirect coupling between different units, or the coupling or direct coupling or indirect coupling between the displayed or discussed communication connections can be in a form of electrical, mechanical or other forms.

[0154] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions and operations of the system, method and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment or a part of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions noted in the blocks can occur in an order different from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in an order different from that disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A heat exchange system comprising a heat exchange circuit including, in series, a compressor, an outdoor heat exchanger, a first throttling device, and an indoor heat exchanger, characterized in that, The heat exchange system further comprises: A three-way pipe comprising a first pipe section, a second pipe section and a third pipe section in communication, the first pipe section being in communication with the first throttling device, and the second pipe section being in communication with the heat exchanger; wherein the heat exchanger is an outdoor heat exchanger or an indoor heat exchanger; A liquid storage device, a refrigerant inlet of the liquid storage device being in communication with the third pipe section, the three-way pipe being capable of separating gaseous refrigerant and liquid refrigerant in the refrigerant flowing through the first throttling device, and the gaseous refrigerant being capable of flowing into the liquid storage device through the third pipe section; A gas return pipe being in communication between a refrigerant outlet of the liquid storage device and a gas return port of the compressor.

2. The heat exchange system according to claim 1, wherein: The third pipe section is arranged above the second pipe section, and there is an angle between the third pipe section and the first pipe section.

3. The heat exchange system according to claim 2, wherein: An opening of the angle is upward, and an angle range of the angle is 30 to 70 degrees; and / or, An extension direction of the second pipe section is the same as an extension direction of the third pipe section.

4. The heat exchange system of claim 1, wherein, The liquid storage device comprises a liquid storage tank, a refrigerant outlet of the liquid storage device being in communication with a refrigerant outlet of the liquid storage tank, and a refrigerant inlet of the liquid storage device being in communication with a refrigerant inlet of the liquid storage tank; The refrigerant outlet of the liquid storage tank is arranged at an upper end portion of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at a lower end portion of the liquid storage tank; and / or, Along a radial direction of the liquid storage tank, the refrigerant outlet of the liquid storage tank is arranged at one end portion of the liquid storage tank, and the refrigerant inlet of the liquid storage tank is arranged at another end portion of the liquid storage tank.

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

1.

6. The heat exchange system according to claim 4, wherein: Along a radial direction of the liquid storage tank, a ratio between a length of a line between the refrigerant outlet of the liquid storage tank and the refrigerant inlet of the liquid storage tank and an inner diameter of the liquid storage tank ranges from 0.6 to 1.

7. The heat exchange system according to claim 1, wherein: The liquid storage device comprises a liquid storage tank, and a ratio between an inner diameter of the liquid storage tank and an inner diameter of the third pipe section ranges from 5 to 10.

8. The heat exchange system according to any one of claims 1 to 7, characterized in that, Further comprising: A second throttling device arranged in the gas return pipe; And / or, An electromagnetic valve 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 by, The heat exchange system is the heat exchange system according to any one of claims 1 to 8, and the control method comprises: Obtaining an operating parameter of the heat exchange system; Adjusting a refrigerant storage capacity of the liquid storage device according to the operating parameter of the heat exchange system.

10. A control device for a heat exchange system, comprising a processor and a memory having stored program instructions, wherein, The processor is configured to execute the control method for the heat exchange system according to claim 9 when the program instructions are executed.

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