Heat exchange subsystem, heat exchange device, air conditioning system, air conditioning equipment and control method

Abstract

The invention provides a heat exchange subsystem, a heat exchange device, an air conditioning system, air conditioning equipment and a control method. The heat exchange subsystem can comprise a refrigerant main flow path and a refrigerant branch flow path. The flow direction of a refrigerant in the refrigerant main flow path is the first heat exchanger, the first throttling device, the flash evaporator, the liquid separation device and the second heat exchanger. And a refrigerant in the refrigerant branch flow path flows to the flash evaporator, the second throttling device and the first heat exchanger. A refrigerant in the refrigerant main flow path separates a gaseous refrigerant into the refrigerant branch flow path through the flash evaporator, the separated gaseous refrigerant enters the second heat exchange flow path of the first heat exchanger, and the separated gaseous refrigerant and a refrigerant in the first heat exchange flow path of the first heat exchanger are cooled. In addition, due to the fact that the flash evaporator separates the gaseous refrigerant into the refrigerant branch flow path, the dryness of the refrigerant on the downstream side of the flash evaporator in the refrigerant main flow path can be reduced, the influence of the gaseous refrigerant on the liquid refrigerant entering the liquid separation device is reduced, the liquid separation uniformity can be improved, and the utilization rate of the second heat exchanger is increased.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a heat exchange subsystem, a heat exchange device, an air conditioning system, an air conditioning equipment and a control method. Background Art

[0002] With the continuous improvement of social living standards and the continuous expansion of industrial production scale, the demand for refrigeration function of air-conditioning system, as a key equipment for regulating indoor ambient temperature, has shown a significant growth trend. During the operation of air-conditioning system, the throttling and heat exchange of refrigerant plays a vital role in the overall refrigeration effect.

[0003] In the related art, it is usually necessary to divide the throttled refrigerant into multiple flow paths so that it can evenly enter the heat exchanger for heat exchange. However, in the critical process of throttling, the refrigerant is very likely to produce flash steam due to the influence of factors such as pressure reduction. The appearance of this flash steam causes the coexistence of gaseous refrigerant and liquid refrigerant in the refrigerant flow path. Due to the difference in physical properties between the gaseous refrigerant and the liquid refrigerant, its flow characteristics and distribution laws are difficult to keep consistent with the liquid refrigerant during the liquid separation process, which leads to serious damage to the uniformity of the liquid separation. When the liquid separation is uneven, there are differences in the amount of refrigerant and the state of the refrigerant entering the heat exchanger in each flow path, which makes the heat exchanger unable to fully function and reduces the utilization rate. Summary of the invention

[0004] In view of this, in order to solve the technical problem in the prior art that gaseous refrigerant affects liquid separation uniformity and reduces the utilization rate of the heat exchanger, the present disclosure provides a heat exchange subsystem, a heat exchange device, an air conditioning system, an air conditioning equipment and a control method.

[0005] According to a first aspect of an embodiment of the present disclosure, a heat exchange subsystem is provided, which is applied to an air conditioning system, wherein the heat exchange subsystem comprises a refrigerant main flow path and a refrigerant branch flow path, wherein the refrigerant inlet of the refrigerant main flow path is the refrigerant inlet of the heat exchange subsystem, and the refrigerant outlet of the refrigerant main flow path is the refrigerant outlet of the heat exchange subsystem;

[0006] The refrigerant main flow path includes a first heat exchange flow path of a first heat exchanger, a first throttling device, a flash evaporator, a liquid separation device, and a second heat exchange flow path of a second heat exchanger that are sequentially connected, wherein the refrigerant outlet of the first heat exchange flow path is connected to the refrigerant inlet of the flash evaporator, and the liquid refrigerant outlet of the flash evaporator is connected to the refrigerant inlet of the second heat exchange flow path;

[0007] The refrigerant branch flow path includes a second throttling device and a third heat exchange flow path of the first heat exchanger which are connected in sequence, the refrigerant inlet of the refrigerant branch flow path is connected to the gaseous refrigerant outlet of the flash evaporator, and the refrigerant outlet of the refrigerant branch flow path is connected to the refrigerant outlet of the refrigerant main flow path.

[0008] In an alternative embodiment,

[0009] The refrigerant branch flow path includes a control valve, and the control valve is located on the downstream side of the refrigerant outlet of the third heat exchange flow path.

[0010] In an alternative embodiment,

[0011] The control valve includes a one-way valve, an inlet of the one-way valve is communicated with a refrigerant outlet of the third heat exchange flow path, and an outlet of the one-way valve is communicated with a refrigerant outlet of the refrigerant branch flow path.

[0012] In an alternative embodiment,

[0013] The refrigerant branch flow path includes a first temperature detection device, a second temperature detection device and a control device, and the first temperature detection device, the second temperature detection device and the second throttling device are all electrically connected to the control device;

[0014] The first temperature detection device is located between the gaseous refrigerant outlet of the flash evaporator and the second throttling device, and is used to detect the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path;

[0015] The second temperature detection device is located at the outlet side of the control valve and is used to detect the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path;

[0016] The control device is configured to control the opening degree of the second throttle device based on the temperature detected by the first temperature detection device and the temperature detected by the second temperature detection device.

[0017] In an alternative embodiment,

[0018] The refrigerant branch flow path includes a first pressure detection device, a second pressure detection device and a control device, and the first pressure detection device, the second pressure detection device and the second throttling device are all electrically connected to the control device;

[0019] The first pressure detection device is located between the gaseous refrigerant outlet of the flash evaporator and the second throttling device, and is used to detect the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path;

[0020] The second pressure detection device is located at the outlet side of the control valve and is used to detect the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path;

[0021] The control device is configured to control the opening degree of the second throttle device based on the pressure detected by the first pressure detection device and the pressure detected by the second pressure detection device.

[0022] In an alternative embodiment,

[0023] The first throttling device includes at least one of the following: an electronic expansion valve, a capillary tube;

[0024] and / or,

[0025] The second throttling device includes at least one of the following: an electronic expansion valve and a capillary tube.

[0026] In an alternative embodiment,

[0027] The refrigerant main flow path includes an air collecting device, and the air collecting device is located on the downstream side of the second heat exchange flow path.

[0028] According to a second aspect of an embodiment of the present disclosure, a heat exchange device is provided, wherein the heat exchange device comprises a heat exchange subsystem as described in any one of the first aspects.

[0029] According to a third aspect of an embodiment of the present disclosure, there is provided an air-conditioning system, comprising a heat exchange subsystem as described in any one of the first aspects.

[0030] According to a fourth aspect of an embodiment of the present disclosure, an air-conditioning device is provided, wherein the air-conditioning device comprises the air-conditioning system as described in the third aspect.

[0031] According to a fifth aspect of an embodiment of the present disclosure, a control method is provided, wherein the control method is applied to the heat exchange subsystem as described in any one of the first aspects, and the control method comprises:

[0032] When the heat exchange subsystem is cooling the space, the opening of the second throttling device of the refrigerant branch flow path is controlled based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path;

[0033] and / or,

[0034] When the heat exchange subsystem is cooling the space, the opening of the second throttling device of the refrigerant branch flow path is controlled based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path.

[0035] In an alternative embodiment,

[0036] The step of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path comprises:

[0037] If the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, the second throttling device is controlled to increase its opening.

[0038] In an alternative embodiment,

[0039] The step of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path comprises:

[0040] If the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, the second throttling device is controlled to reduce the opening degree.

[0041] In an alternative embodiment,

[0042] The step of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path comprises:

[0043] If the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is lower than the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, and is higher than the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, the opening of the second throttling device is controlled to remain unchanged.

[0044] In an alternative embodiment,

[0045] The method of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path comprises:

[0046] If the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path and the refrigerant pressure threshold, the second throttling device is controlled to increase its opening.

[0047] In an alternative embodiment,

[0048] The method of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path comprises:

[0049] If the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path, the second throttling device is controlled to reduce the opening degree.

[0050] In an alternative embodiment,

[0051] The method of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path comprises:

[0052] If the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is less than the sum of the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path and the refrigerant pressure threshold, and is greater than the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path, the opening of the second throttling device is controlled to remain unchanged.

[0053] In an alternative embodiment,

[0054] When the heat exchange subsystem includes a control valve, the control method includes:

[0055] When the heat exchange subsystem is heating the space, controlling the control valve to be in a closed state;

[0056] When the heat exchange subsystem is cooling the space, the control valve is controlled to be in an open state.

[0057] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: In the present disclosure, the heat exchange subsystem may include a refrigerant main flow path and a refrigerant branch flow path, and the refrigerant inlet and the liquid refrigerant outlet of the flash evaporator are connected to the refrigerant main flow path, and the flow direction of the refrigerant in the refrigerant main flow path is the first heat exchanger, the first throttling device, the flash evaporator, the liquid separator and the second heat exchanger; the gaseous refrigerant outlet of the flash evaporator is connected to the refrigerant inlet of the refrigerant branch flow path, and the flow direction of the refrigerant in the refrigerant branch flow path is the flash evaporator, the second throttling device and the first heat exchanger; and the refrigerant outlet of the refrigerant branch flow path is connected to the refrigerant outlet of the refrigerant main flow path. In this way, the refrigerant in the refrigerant main flow path of the present disclosure generates flash steam after being throttled by the first throttling device, and then the gaseous refrigerant is separated by the flash evaporator and enters the refrigerant branch flow path. The separated gaseous refrigerant enters the second heat exchange flow path of the first heat exchanger and is cooled with the refrigerant in the first heat exchange flow path of the first heat exchanger, that is, the refrigerant in the refrigerant main flow path is cooled by the refrigerant branch flow path. In addition, since the flash evaporator separates the gaseous refrigerant into the refrigerant branch flow path, the dryness of the refrigerant on the downstream side of the flash evaporator in the refrigerant main flow path can be reduced, so that the liquid refrigerant entering the liquid separation device is less affected by the gaseous refrigerant, and the uniformity of the liquid separation can be improved, thereby improving the utilization rate of the second heat exchanger, increasing the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation.

[0058] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0061] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0062] Figure 1 is a schematic diagram of a heat exchange subsystem according to an exemplary embodiment.

[0063] Figure 2 is a schematic diagram of a heat exchange device according to an exemplary embodiment.

[0064] Figure 3 yes Figure 2 A partial schematic diagram of position A in the middle.

[0065] Figure 4 It is a schematic diagram showing the comparison between a heat exchange subsystem according to an exemplary embodiment and a traditional solution.

[0066] Figure 5 is another schematic diagram comparing a heat exchange subsystem according to an exemplary embodiment and a traditional solution.

[0067] Figure 6 is a schematic diagram of an air conditioning system according to an exemplary embodiment.

[0068] Reference numerals:

[0069] 10. Indoor side subsystem;

[0070] 11. first heat exchanger; 12. first throttling device; 13. flash evaporator; 14. liquid separation device; 15. second heat exchange device; 16. gas collecting device; 17. second throttling device; 18. control valve;

[0071] 100. Heat exchange device;

[0072] 20. Outdoor subsystem;

[0073] 21. Compressor; 22. Four-way valve; 23. Outdoor heat exchange device; 24. Heating electronic expansion valve; 25. Drive heat dissipation module. DETAILED DESCRIPTION

[0074] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0075] The disclosure below provides many different embodiments or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0076] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a change in posture or a change in motion state, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0077] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0078] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0079] In order to solve the technical problem in the prior art that gaseous refrigerant affects liquid separation uniformity and reduces the utilization rate of the heat exchanger, the present invention provides a heat exchange subsystem, a heat exchange device, an air conditioning system, an air conditioning equipment and a control method.

[0080] Among them, in the present disclosure, the heat exchange subsystem may include a refrigerant main flow path and a refrigerant branch flow path, and the refrigerant inlet and liquid refrigerant outlet of the flash evaporator are connected to the refrigerant main flow path, and the flow direction of the refrigerant in the refrigerant main flow path is the first heat exchanger, the first throttling device, the flash evaporator, the liquid separation device and the second heat exchanger; the gaseous refrigerant outlet of the flash evaporator is connected to the refrigerant inlet of the refrigerant branch flow path, and the flow direction of the refrigerant in the refrigerant branch flow path is the flash evaporator, the second throttling device and the first heat exchanger; and the refrigerant outlet of the refrigerant branch flow path is connected to the refrigerant outlet of the refrigerant main flow path. In this way, the refrigerant in the refrigerant main flow path in the present disclosure generates flash steam after being throttled by the first throttling device, and then the gaseous refrigerant is separated by the flash evaporator and enters the refrigerant branch flow path, and the separated gaseous refrigerant enters the second heat exchange flow path of the first heat exchanger, and is cooled with the refrigerant in the first heat exchange flow path of the first heat exchanger, that is, the refrigerant in the refrigerant main flow path is cooled by the refrigerant branch flow path. In addition, since the flash evaporator separates the gaseous refrigerant into the refrigerant branch flow path, the dryness of the refrigerant on the downstream side of the flash evaporator in the main refrigerant flow path can be reduced, so that the influence of the gaseous refrigerant on the liquid refrigerant entering the liquid separation device is reduced, and the uniformity of the liquid separation can be improved, thereby improving the utilization rate of the second heat exchanger, increasing the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation.

[0081] In an exemplary embodiment, reference Figures 1 to 3 As shown, a heat exchange subsystem and a control method thereof, as well as a heat exchange device 100 are provided. Among them, the heat exchange device 100 may include the above-mentioned heat exchange subsystem, and the heat exchange subsystem may be applied to an air-conditioning system. The heat exchange subsystem may include a refrigerant main flow path and a refrigerant branch flow path. The refrigerant inlet of the refrigerant main flow path is the refrigerant inlet of the heat exchange subsystem, which is used to provide refrigerant to the heat exchange subsystem in a cooling mode (i.e., the heat exchange subsystem is in a cooling state for the space in which it is located). The refrigerant outlet of the refrigerant main flow path is the refrigerant outlet of the heat exchange subsystem, which is used to output the refrigerant of the heat exchange subsystem in the cooling mode.

[0082] The main refrigerant flow path includes a first heat exchange flow path of a first heat exchanger 11, a first throttling device 12, a flash evaporator 13, a liquid separation device 14, and a second heat exchange flow path of a second heat exchanger 15, which are connected in sequence. The refrigerant outlet of the first heat exchange flow path is connected to the refrigerant inlet of the flash evaporator 13, and the liquid refrigerant outlet of the flash evaporator 13 is connected to the refrigerant inlet of the second heat exchange flow path.

[0083] The refrigerant branch flow path includes the second throttling device 17 and the third heat exchange flow path of the first heat exchanger 11. The refrigerant inlet of the refrigerant branch flow path is connected to the gaseous refrigerant outlet of the flash evaporator 13, and the refrigerant outlet of the refrigerant branch flow path is connected to the refrigerant outlet of the refrigerant main flow path.

[0084] That is to say, in the heat exchange subsystem, in the refrigeration mode, the refrigerant in the refrigerant main flow path is throttled by the first throttling device 12 to generate flash steam, and then the gaseous refrigerant is separated into the refrigerant branch flow path through the flash evaporator 13, and the liquid refrigerant continues to remain in the refrigerant main flow path.

[0085] Among them, in the main flow path of the refrigerant, the first throttling device 12 may include an electronic expansion valve, and may also include other devices or assemblies with throttling effects, such as capillaries, which are not limited to this. Among them, when the first throttling device 12 uses an electronic expansion valve, it can accurately control the flow rate and throttling degree of the refrigerant according to the operating conditions of the air-conditioning system. The opening adjustment range of the electronic expansion valve can be 0-500 steps, and the resolution can be 1 step. By connecting with the control device of the air-conditioning system, the control signal is received to adjust the opening. For example, the heat exchange subsystem can be used as the indoor side subsystem 10 of the air-conditioning system. In the cooling mode, when the indoor temperature is high and a large cooling capacity is required, the control device can control the electronic expansion valve to increase the opening according to the preset control algorithm to allow more refrigerant to flow through; and when the indoor temperature is close to the set temperature, the opening can be reduced to reduce the refrigerant flow to maintain a stable temperature.

[0086] In some embodiments, the flash evaporator 13 can be a cylindrical structure with an internal volume of 2L, made of stainless steel, and has good pressure resistance and corrosion resistance. A special gas-liquid separation structure is arranged inside the flash evaporator 13, including a multi-layer baffle and a spiral guide channel. When the refrigerant enters the flash evaporator 13 from the first throttling device 12, the liquid refrigerant begins to flash to form a gaseous refrigerant due to the pressure reduction. The gaseous refrigerant is separated from the liquid refrigerant under the action of the baffle and the guide channel, the gaseous refrigerant moves upward, and the liquid refrigerant flows downward. In addition, in this embodiment, the liquid refrigerant outlet of the flash evaporator 13 can be provided with a liquid level sensor for monitoring the liquid level height of the liquid refrigerant in the flash evaporator 13. When the liquid level is lower than the set lower limit, the control device can sound an alarm, indicating that there may be a refrigerant leak or other abnormal conditions; when the liquid level is higher than the upper limit, the control device can also perform corresponding prompts or adjustments, such as appropriately reducing the opening of the first throttling device 12, reducing the amount of refrigerant entering the flash evaporator 13, and so on.

[0087] Among them, the liquid separation device 14 may include a liquid separation pipe assembly composed of a multi-way shunt pipe. For example, the liquid separation pipe assembly may have 5 shunt branches, and the pipe diameter of each branch may be the same, all of which are 6 mm (it can also be set to other sizes according to actual needs, without limitation). The inlet of the liquid separation device 14 is connected to the liquid refrigerant outlet of the flash evaporator 13, and the liquid refrigerant is evenly distributed to each branch through the precisely designed shunt channel, ensuring that the refrigerant flow rate entering the second heat exchange flow path of the second heat exchanger 15 is uniform.

[0088] Among them, a flow regulating valve can be set at the outlet of each branch of the liquid separation device 14, and these valves can adjust the refrigerant flow of each branch individually as needed to adapt to different working conditions. For example, in some cases, if the heat load of the second heat exchanger 15 area corresponding to a branch is large, the opening of the flow regulating valve of the branch can be appropriately increased to increase the refrigerant flow and improve the heat exchange efficiency of the area.

[0089] It should be noted that after the refrigerant in the main flow path of the refrigerant is throttled by the first throttling device 12, the pressure is reduced, and part of the liquid refrigerant will flash to form a gaseous refrigerant. Because the physical properties and heat exchange methods of the gaseous refrigerant and the liquid refrigerant are different, if they are not separated, the gaseous refrigerant will occupy the flow channel space in the subsequent heat exchange process, affecting the effective contact between the liquid refrigerant and the heat exchanger, and reducing the heat exchange efficiency. The special structure inside the flash evaporator 13 in this embodiment (such as a multi-layer baffle and a spiral guide channel) can separate the gaseous refrigerant and the liquid refrigerant. The gaseous refrigerant moves upward, and the liquid refrigerant flows downward. The gaseous refrigerant is separated by the flash evaporator 13, so that the dryness of the refrigerant output from the liquid-cooled refrigerant outlet of the flash evaporator 13 is reduced, and the refrigerant in the main flow path of the refrigerant can be more effectively distributed by the liquid separation device 14 to the second heat exchange flow path of the second heat exchanger 15, thereby improving the heat exchange efficiency of the entire second heat exchanger 15 and improving the utilization rate of the second heat exchanger 15.

[0090] Wherein, in the refrigerant branch flow path, the second throttling device 17 may include a capillary tube, and may also include other devices or assemblies with throttling effects, such as an electronic expansion valve. It should be noted that, since the flow rate of the gaseous refrigerant is relatively small compared to the liquid refrigerant, the throttling characteristics of the capillary tube can meet its flow control requirements, and its structure is simple and the cost is low, which is suitable for the application scenario of the refrigerant branch flow path. For example, the inner diameter of the capillary tube can be 1.5 mm and the length can be 1 m. The throttling effect of the capillary tube can further adjust the pressure and flow rate of the gaseous refrigerant entering the refrigerant branch flow path from the gaseous refrigerant outlet of the flash evaporator 13.

[0091] Among them, the third heat exchange flow path is located in the first heat exchanger 11, and its main function is to allow the gaseous refrigerant from the refrigerant branch flow path to undergo secondary heat exchange in the first heat exchanger 11. When the gaseous refrigerant flows in the third heat exchange flow path, it exchanges heat with the refrigerant in the first heat exchange pipeline, thereby reducing the temperature of the refrigerant in the first heat exchange pipeline. In addition, the outlet of the third heat exchange flow path is connected to the refrigerant outlet of the refrigerant main flow path, so that the gaseous refrigerant after heat exchange can be mixed with the refrigerant in the refrigerant main flow path after heat exchange through the second heat exchanger 15 and then discharged from the heat exchange subsystem.

[0092] For example, when the liquid dispensing device 14 includes a liquid dispensing tube assembly, refer to Figure 4 and Figure 5 As shown, it can be seen that compared with the traditional solution, this embodiment can reduce the refrigerant inlet dryness of the liquid distributor assembly and improve the uniformity of liquid distribution of the liquid distributor assembly, thereby improving the heat exchange effect of the heat exchange subsystem and improving the cooling capacity of the heat exchange subsystem in the cooling mode.

[0093] In this embodiment, the refrigerant in the refrigerant main flow path generates flash steam after being throttled by the first throttling device 12, and then the gaseous refrigerant is separated into the refrigerant branch flow path by the flash evaporator 13. The separated gaseous refrigerant enters the second heat exchange flow path of the first heat exchanger 11 and is cooled with the refrigerant in the first heat exchange flow path of the first heat exchanger 11, that is, the refrigerant in the refrigerant main flow path is cooled by the refrigerant branch flow path. In addition, since the flash evaporator 13 separates the gaseous refrigerant into the refrigerant branch flow path, the dryness of the refrigerant on the downstream side of the flash evaporator 13 in the refrigerant main flow path can be reduced, so that the liquid refrigerant entering the liquid separation device 14 is less affected by the gaseous refrigerant, and the uniformity of the liquid separation can be improved, thereby improving the utilization rate of the second heat exchanger 15, improving the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation.

[0094] The heat exchange subsystem may include an air collecting device 16, which may include, for example, an air collecting pipe assembly, or other devices or assemblies having an air collecting function, without limitation. The air collecting device 16 may be located at the downstream side of the second heat exchange flow path. That is, in the refrigerant main flow path, the refrigerant passes through the second heat exchanger 15 for heat exchange, passes through the air collecting device 16, and then reaches the refrigerant outlet of the refrigerant main flow path.

[0095] Among them, the gas collecting device 16 can further process the refrigerant entering from the second heat exchanger 15 after heat exchange, so as to better separate the gaseous refrigerant and liquid refrigerant that may exist therein. For example, when the heat exchange subsystem of this embodiment is used as the indoor subsystem 10, and the refrigerant outlet of its refrigerant main flow path is connected to the outdoor subsystem 20, the outdoor subsystem 20 may include a compressor 21, and the refrigerant outlet of the refrigerant main flow path may be connected to the refrigerant inlet of the compressor 21. Because the refrigerant that will eventually enter the compressor 21 should be gaseous, if there is too much liquid refrigerant entering the compressor 21, it may cause liquid hammer phenomenon in the compressor 21, which will cause serious damage to the compressor 21, such as damaging the valve plate, crankshaft and other components of the compressor 21, affecting the normal operation and service life of the compressor 21. This embodiment can effectively reduce the amount of liquid refrigerant entering the compressor 21 through the gas-liquid separation function of the gas collecting device 16, and ensure that the refrigerant entering the compressor 21 is mainly gaseous, thereby ensuring the safe and stable operation of the compressor 21.

[0096] Among them, in the process of the refrigerant flowing from the second heat exchanger 15 to the compressor 21, the gas collecting device 16 can play a role in buffering and regulating the pressure. The pressure of the refrigerant after heat exchange in the second heat exchanger 15 may fluctuate to a certain extent, and the compressor 21 has certain requirements for the pressure of the incoming refrigerant. Too high or too low pressure is not conducive to the efficient operation of the compressor 21. The gas collecting device 16 can make the refrigerant pass through a certain flow path and the internal structure to adjust the pressure so that it can more stably reach the pressure range adapted to the compressor 21, which helps the compressor 21 to work under more ideal pressure conditions and improve the working efficiency and performance of the compressor 21.

[0097] In addition, the structural design inside the gas collecting device 16 can cause the refrigerant to form a specific flow pattern therein, so that the refrigerant flow can be more evenly distributed before entering the compressor 21. Uniform refrigerant flow is also important for the stable operation of the compressor 21. Uneven flow may cause uneven force on different parts inside the compressor 21, resulting in vibration, noise and other problems, which will also affect the reliability and service life of the compressor 21 in the long run. The uniform distribution of the refrigerant flow by the gas collecting device 16 allows the compressor 21 to operate under stable and balanced refrigerant inflow conditions, further ensuring the stable operation of the compressor 21 and the entire heat exchange subsystem.

[0098] In an exemplary embodiment, reference Figures 1 to 3 As shown, a heat exchange subsystem and a control method thereof, as well as a heat exchange device 100 are provided. The heat exchange subsystem can be applied to an air conditioning system. In the heat exchange subsystem, the refrigerant branch flow path may include a control valve 18, and the control valve 18 may be located at the downstream side of the refrigerant outlet of the second heat exchange flow path.

[0099] Among them, when the heat exchange subsystem is cooling the space, the control device of the heat exchange subsystem (which can share the same control device with the air conditioning system, that is, this control device controls the heat exchange subsystem and other components of the air conditioning system) controls the control valve 18 to be in an open state. In this case, the refrigerant branch flow path is in a conducting state, and the gaseous refrigerant in the flash evaporator 13 can enter the refrigerant branch flow path. The separated gaseous refrigerant enters the second heat exchange flow path of the first heat exchanger 11 and cools down the refrigerant in the first heat exchange flow path of the first heat exchanger 11, that is, the refrigerant in the refrigerant main flow path is cooled down by using the refrigerant branch flow path. In addition, since the flash evaporator 13 separates the gaseous refrigerant into the refrigerant branch flow path, the dryness of the refrigerant on the downstream side of the flash evaporator 13 in the refrigerant main flow path can be reduced, so that the influence of the gaseous refrigerant on the liquid refrigerant entering the liquid separation device 14 is reduced, and the uniformity of the liquid separation can be improved, thereby improving the utilization rate of the second heat exchanger 15, increasing the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation.

[0100] When the heat exchange subsystem is heating the space, the control device can control the control valve 18 to be in the off state. In this case, the refrigerant enters the second heat exchange pipeline of the second heat exchanger 15 from the refrigerant inlet of the heat exchange subsystem, absorbs heat therein, and then passes through the liquid separator 14 to collect, passes through the liquid refrigerant channel of the flash evaporator 13 (at this time, the flash evaporator 13 mainly serves as a channel, and very little gaseous refrigerant is produced), and then passes through the first throttling device 12 to throttle and reduce the pressure, enters the first heat exchange pipeline of the first heat exchanger 11, releases heat in the first heat exchange pipeline, and finally flows out from the refrigerant outlet of the refrigerant main flow path. During the entire heating process, due to the changes in system pressure and refrigerant flow direction, the control valve 18 is in the off state, and the refrigerant branch flow path does not participate in the circulation, which can ensure the high efficiency and stability of the heating cycle.

[0101] The control valve 18 may be, for example, a one-way valve. The inlet of the one-way valve is connected to the refrigerant outlet of the third heat exchange flow path, and the outlet of the one-way valve is connected to the refrigerant outlet of the refrigerant branch flow path. In other words, the one-way valve allows the refrigerant in the refrigerant branch flow path to flow from the flash evaporator 13 to the refrigerant outlet of the refrigerant branch flow path, but does not allow the refrigerant in the refrigerant branch flow path to flow from the refrigerant outlet of the refrigerant branch flow path in the reverse direction to the flash evaporator 13.

[0102] In the heat exchange subsystem, since the control valve 18 is a one-way valve, it is possible to omit the control of the control valve 18. It should be noted that the one-way valve can be a valve without a cracking pressure or a valve with a cracking pressure.

[0103] For example, when the one-way valve is not set with an opening pressure, when the heat exchange subsystem is heating the space, the refrigerant branch flow path participates in the heat exchange, and the refrigerant in the refrigerant main flow path can be cooled by the refrigerant branch flow path, and the dryness of the refrigerant on the downstream side of the flash evaporator 13 in the refrigerant main flow path can be reduced, so that the liquid refrigerant entering the liquid separation device 14 is less affected by the gaseous refrigerant, and the uniformity of the liquid separation can be improved, thereby improving the utilization rate of the second heat exchanger 15, increasing the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation. When the heat exchange subsystem is heating the space, the refrigerant branch flow path does not participate in the circulation, which can ensure the efficiency and stability of the heating cycle.

[0104] For another example, when the one-way valve is set with an opening pressure, when the heat exchange subsystem is heating the space in which it is located, when the refrigerant pressure in the third heat exchange pipeline is higher than the opening pressure of the one-way valve, the one-way valve opens, and the refrigerant branch flow path participates in the heat exchange. The refrigerant branch flow path can be used to cool the refrigerant in the main refrigerant flow path, and the dryness of the refrigerant on the downstream side of the flash evaporator 13 in the main refrigerant flow path can be reduced, so that the liquid refrigerant entering the liquid separation device 14 is less affected by the gaseous refrigerant, which can improve the uniformity of liquid separation, thereby improving the utilization rate of the second heat exchanger 15, increasing the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation. When the heat exchange subsystem is heating the space it is in, due to the changes in the pressure distribution inside the air-conditioning system and the flow direction of the refrigerant, the refrigerant pressure in the third heat exchange pipeline is always lower than the opening pressure, and the one-way valve remains closed, thereby ensuring that the branch refrigerant does not circulate and the refrigerant branch flow does not participate in the circulation, ensuring that the refrigerant circulates efficiently according to the designed mainstream flow during the heating process, thereby ensuring the efficiency and stability of the heating cycle.

[0105] It should be noted that, under normal circumstances, a one-way valve with an opening pressure setting will only allow the refrigerant to pass through when the refrigerant pressure reaches the opening pressure. If there is no opening pressure setting, the one-way valve works more like a simple check valve. As long as the refrigerant has a positive flow trend in the branch, it can pass through the one-way valve. During the refrigeration process, when the gaseous refrigerant flows out of the third heat exchange pipeline and flows to the refrigerant outlet of the refrigerant branch flow path, it may pass through the one-way valve more easily and enter the subsequent cycle due to slight fluctuations in system pressure or changes in the flow rate of the gaseous refrigerant.

[0106] In addition, without opening pressure, the system's control accuracy over the refrigerant branch will be reduced. For example, at the moment when the air conditioning system starts or stops, or when the operating conditions change rapidly, the pressure in the system will fluctuate. If the one-way valve has no opening pressure, it may cause unexpected flow of refrigerant in the branch. In heating mode, it is originally hoped that the branch will not flow, but due to the lack of opening pressure, a small amount of refrigerant may accidentally enter the branch, which may interfere with the normal operation of the heating cycle and affect the stability and heating efficiency of the system.

[0107] Moreover, the lack of opening pressure may affect the reasonable distribution of refrigerant between the main circuit and the branch circuit. In the cooling mode, a reasonable opening pressure can ensure that the gaseous refrigerant will enter the branch circuit for secondary heat exchange only when it reaches a certain pressure in the third heat exchange circuit, that is, when sufficient heat exchange is completed. Without opening pressure, part of the gaseous refrigerant may enter the branch circuit prematurely, resulting in insufficient heat exchange in the third heat exchange circuit, thereby affecting the heat exchange efficiency of the entire system.

[0108] Among them, in some simple systems that do not require high precision in refrigerant flow and pressure control, it may be acceptable for the one-way valve not to set the opening pressure. However, in order to better control the flow of the refrigerant, even if the opening pressure is not set, a flow control valve or a pressure sensor can be installed before and after the one-way valve. The flow rate of the refrigerant in the branch can be adjusted manually or automatically by the flow control valve, and the pressure of the branch can be monitored in real time by the pressure sensor. When the pressure fluctuates abnormally, timely measures (such as adjusting the operating frequency of the compressor 21, adjusting other throttling devices, etc.) are taken to maintain the stable operation of the system.

[0109] In an exemplary embodiment, reference Figures 1 to 3 As shown, a heat exchange subsystem and a control method thereof, as well as a heat exchange device 100 are provided. The heat exchange subsystem can be applied to an air conditioning system. In the heat exchange subsystem, the refrigerant branch flow path may include a first temperature detection device, a second temperature detection device and a control device, and the first temperature detection device, the second temperature detection device and the second throttling device 17 are all electrically connected to the control device.

[0110] The first temperature detection device may include, for example, a temperature sensor, which may be located between the gaseous refrigerant outlet of the flash evaporator 13 and the second throttling device 17, and is used to detect the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path. The second temperature detection device may include, for example, a temperature sensor, which may be located at the outlet side of the control valve 18, and is used to detect the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path. The control device may be configured to control the opening of the second throttling device 17 based on the temperature detected by the first temperature detection device and the temperature detected by the second temperature detection device.

[0111] Among them, if the temperature detected by the first temperature detection device is greater than or equal to the sum of the temperature detected by the second temperature detection device and the refrigerant temperature threshold, the second throttling device 17 can be controlled to increase the opening. That is, if the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, the second throttling device 17 is controlled to increase the opening. It should be noted that if the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, it means that the heat exchange effect of the gaseous refrigerant in the third heat exchange pipeline is not good, and it is necessary to increase the flow rate of the gaseous refrigerant in the branch flow path to adjust the refrigerant distribution of the entire system. At this time, the control device sends a signal to the second throttling device 17 to increase its opening, allowing more gaseous refrigerant to enter the third heat exchange pipeline, thereby affecting the refrigerant state and heat exchange effect of the entire system. Moreover, through the above-mentioned control, it is also possible to avoid a large difference between the refrigerant temperature on the outlet side of the refrigerant branch flow path and the refrigerant temperature on the outlet side of the refrigerant main flow path, thereby better ensuring that the refrigerant temperature on the outlet side of the refrigerant branch flow path and the refrigerant temperature on the outlet side of the refrigerant main flow path are balanced, thereby better ensuring the circulation of the refrigerant.

[0112] If the temperature detected by the first temperature detection device is less than or equal to the temperature detected by the second temperature detection device, the second throttling device 17 can be controlled to reduce the opening. That is, if the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, the second throttling device 17 is controlled to increase the opening. It should be noted that if the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, it indicates that the heat exchange of the gaseous refrigerant in the third heat exchange pipeline is excessive, which may lead to a decrease in system efficiency. The control device controls the second throttling device 17 to reduce the opening, reduce the flow of the gaseous refrigerant in the branch flow path, restore the system to balance, and also avoid the refrigerant temperature on the outlet side of the refrigerant branch flow path and the refrigerant temperature on the outlet side of the refrigerant main flow path. Too large a difference can be avoided, so as to better ensure that the refrigerant temperature on the outlet side of the refrigerant branch flow path and the refrigerant temperature on the outlet side of the refrigerant main flow path are balanced, thereby better ensuring the circulation of the refrigerant.

[0113] If the temperature detected by the first temperature detection device is greater than the temperature detected by the second temperature detection device, and is less than the sum of the temperature detected by the second temperature detection device and the refrigerant temperature threshold, the opening of the second throttling device 17 can be controlled to remain unchanged. That is, if the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is less than the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, and is greater than the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, the opening of the second throttling device 17 is controlled to remain unchanged. It should be noted that if the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is less than the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, and is greater than the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, it means that the heat exchange of the gaseous refrigerant in the third heat exchange pipeline is within the normal range, and the control device keeps the opening of the second throttling device 17 unchanged to maintain the stable operation of the system.

[0114] For example, the control device may adopt a programmable logic controller (PLC), which may receive temperature signals from the first temperature detection device and the second temperature detection device, and control the opening of the second throttling device 17 according to a preset control algorithm. The PLC may have multiple input and output interfaces, and can be easily connected and communicated with devices such as temperature sensors and thermal expansion valves. In the control algorithm, the refrigerant temperature threshold is set to 5°C. For example, when the temperature detected by the first temperature detection device is greater than or equal to the sum of the temperature detected by the second temperature detection device and 5°C, the PLC sends a signal to the second throttling device 17 to increase its opening; when the temperature detected by the first temperature detection device is less than or equal to the temperature detected by the second temperature detection device, the PLC controls the second throttling device 17 to reduce its opening; when the temperature detected by the first temperature detection device is greater than the temperature detected by the second temperature detection device, and less than the sum of the temperature detected by the second temperature detection device and 5°C, the PLC keeps the opening of the second throttling device 17 unchanged.

[0115] In this embodiment, through the coordinated work of the first temperature detection device, the second temperature detection device and the control device, the opening of the second throttling device 17 can be accurately controlled, thereby achieving precise regulation of the refrigerant flow rate of the refrigerant branch flow path, which can better ensure the refrigerant temperature balance at the inlet and outlet of the refrigerant branch flow path, and can also better ensure better heat exchange and temperature balance between the refrigerant branch flow path and the refrigerant main flow path, thereby ensuring the normal circulation of the refrigerant.

[0116] It should be noted that, in addition to controlling the opening degree of the second throttle device 17 by temperature, it can also be controlled by pressure.

[0117] In an exemplary embodiment, reference Figures 1 to 3 As shown, a heat exchange subsystem and a control method thereof, as well as a heat exchange device 100 are provided. The heat exchange subsystem can be applied to an air conditioning system. In the heat exchange subsystem, the refrigerant branch path includes a first pressure detection device, a second pressure detection device and a control device, and the first pressure detection device, the second pressure detection device and the second throttling device 17 are all electrically connected to the control device.

[0118] The first pressure detection device may include, for example, a pressure sensor, which may be located between the gaseous refrigerant outlet of the flash evaporator 13 and the second throttling device 17, and is used to detect the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path. The second pressure detection device may include a pressure sensor, which may be located at the outlet side of the control valve 18, and is used to detect the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path. The control device may be configured to control the opening of the second throttling device 17 based on the pressure detected by the first pressure detection device and the pressure detected by the second pressure detection device.

[0119] If the pressure detected by the first pressure detection device is greater than or equal to the sum of the pressure detected by the second pressure detection device and the refrigerant pressure threshold, the second throttling device 17 can be controlled to increase the opening. That is, if the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path and the refrigerant pressure threshold, the second throttling device 17 is controlled to increase the opening.

[0120] If the pressure detected by the first pressure detection device is less than or equal to the pressure detected by the second pressure detection device, the second throttling device 17 can be controlled to reduce the opening. That is, if the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path, the second throttling device 17 is controlled to increase the opening.

[0121] If the pressure detected by the first pressure detection device is greater than the pressure detected by the second pressure detection device, and less than the sum of the pressure detected by the second pressure detection device and the refrigerant pressure threshold, the opening of the second throttling device 17 can be controlled to remain unchanged. That is, if the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is less than the sum of the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path and the refrigerant pressure threshold, and greater than the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path, the opening of the second throttling device 17 is controlled to remain unchanged.

[0122] In this embodiment, through the coordinated work of the first pressure detection device, the second pressure detection device and the control device, the opening of the second throttling device 17 can be accurately controlled, thereby realizing precise regulation of the refrigerant flow rate of the refrigerant branch flow path, which can better ensure the refrigerant pressure balance at the inlet and outlet of the refrigerant branch flow path, and can also better ensure better heat exchange and pressure balance between the refrigerant branch flow path and the refrigerant main flow path, thereby ensuring the normal circulation of the refrigerant.

[0123] In an exemplary embodiment, reference Figures 1 to 3 as well as Figure 6 As shown, an air conditioning system and an air conditioning device are provided. The air conditioning device may include the above-mentioned air conditioning system. The air conditioning system may include the above-mentioned heat exchange device 100, which may be recorded as an indoor heat exchange device. The indoor heat exchange device includes the above-mentioned heat exchange subsystem, so that the air conditioning system has the beneficial effects brought by the above-mentioned heat exchange subsystem.

[0124] The air conditioning system may include an indoor subsystem 10 and an outdoor subsystem 20. The indoor subsystem 10 includes the above-mentioned heat exchange subsystem. The refrigerant outlet of the outdoor subsystem 20 is connected to the refrigerant inlet of the refrigerant main flow path in the heat exchange subsystem, and the refrigerant inlet of the outdoor subsystem 20 is connected to the refrigerant outlet of the refrigerant main flow path.

[0125] The outdoor subsystem 20 may include a compressor 21, a four-way valve 22, an outdoor heat exchange device 23, a heating electronic expansion valve 24 (EXV) and a driving heat dissipation module 25. The refrigerant outlet of the refrigerant main flow path is connected to the refrigerant inlet of the compressor 21 through the four-way valve 22, the compressor 21 is connected to the outdoor heat exchange device 23 through the four-way valve 22, and the outdoor heat exchange device 23, the heating EXV and the driving heat dissipation module 25 are connected in sequence. In the outdoor subsystem 20, when the indoor subsystem 10 is in the cooling mode, the refrigerant discharged from the refrigerant main flow path passes through the four-way valve 22, the compressor 21, the four-way valve 22, the outdoor heat exchange device 23, the heating EXV and the driving heat dissipation module 25 in sequence, and then enters the indoor subsystem 10 through the refrigerant inlet of the refrigerant main flow path.

[0126] The drive heat dissipation module 25 can adopt air cooling, and the heat sink is made of aluminum with a large heat dissipation area. A fan is provided inside, and the speed can be automatically adjusted according to the temperature. When the module temperature rises, the fan speed increases to enhance the heat dissipation effect, ensure that the drive components work at a suitable temperature, and ensure the stable operation of the system.

[0127] In this embodiment, in the cooling mode of the air-conditioning system, the refrigerant in the refrigerant main flow path of the heat exchange subsystem of the indoor subsystem 10 enters the gas collecting device 16 after heat exchange in the second heat exchanger 15, and the gaseous refrigerant passes through the refrigerant outlet of the refrigerant main flow path and enters the compressor 21 through the four-way valve 22. The compressor 21 compresses the gaseous refrigerant into a high-temperature and high-pressure state, and then enters the outdoor heat exchange device 23 through the four-way valve 22. In the outdoor heat exchange device 23, the gaseous refrigerant exchanges heat with the outdoor air, releases heat and condenses into liquid refrigerant. The liquid refrigerant flows through the heating EXV and the driving heat dissipation module 25 in sequence. The heating EXV maintains a certain opening in the cooling mode, and appropriately throttles the refrigerant. The driving heat dissipation module 25 stabilizes and assists the heat dissipation of the refrigerant passing through. After that, the refrigerant returns to the indoor subsystem 10 through the refrigerant main flow path inlet, continues to evaporate and absorb heat on the indoor side, and completes the refrigeration cycle.

[0128] In the heating mode of the air-conditioning system, the refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant in the compressor 21, and enters the refrigerant main flow path of the heat exchange subsystem of the indoor subsystem 10 through the four-way valve 22. On the indoor side, the gaseous refrigerant exchanges heat with the indoor air in the first heat exchanger 11 and the second heat exchanger 15, releases heat and condenses into liquid refrigerant. After passing through the liquid separator 14, the flash evaporator 13, the first heat exchanger 11 and other components, the liquid refrigerant enters the outdoor heat exchange device 23 of the outdoor subsystem 20 through the connecting pipe. In the outdoor heat exchange device 23, the liquid refrigerant absorbs the heat of the outdoor air and evaporates into a gaseous refrigerant, and then throttles and reduces the pressure through the heating EXV. At this time, the heating EXV accurately controls the opening according to the heating working condition requirements, adjusts the refrigerant flow and pressure, and then passes through the driving heat dissipation module 25, and finally returns to the compressor 21 through the four-way valve 22 to start the next heating cycle. In heating mode, the one-way valve in the refrigerant branch flow path is closed, and the gaseous refrigerant does not enter the branch flow path, ensuring that the heating cycle runs efficiently according to the designed main flow path.

[0129] In this embodiment, since the above-mentioned heat exchange subsystem is provided, in the refrigeration mode, the refrigerant in the refrigerant main flow path generates flash steam after being throttled by the first throttling device 12, and then the gaseous refrigerant is separated by the flash evaporator 13 and enters the refrigerant branch flow path. The separated gaseous refrigerant enters the second heat exchange flow path of the first heat exchanger 11 and is cooled with the refrigerant in the first heat exchange flow path of the first heat exchanger 11, that is, the refrigerant in the refrigerant main flow path is cooled by the refrigerant branch flow path. In addition, since the flash evaporator 13 separates the gaseous refrigerant into the refrigerant branch flow path, the dryness of the refrigerant on the downstream side of the flash evaporator 13 in the refrigerant main flow path can be reduced, so that the liquid refrigerant entering the liquid separation device 14 is less affected by the gaseous refrigerant, and the uniformity of the liquid separation can be improved, thereby improving the utilization rate of the second heat exchanger 15, improving the cooling capacity of the entire heat exchange subsystem, and improving the reliability of operation.

[0130] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0131] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0132] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more limiting values, the elements defined by the sentence "comprise a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0133] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A heat exchange subsystem, applied to an air conditioning system, characterized in that: The heat exchange subsystem comprises a refrigerant main flow path and a refrigerant branch flow path, the refrigerant inlet of the refrigerant main flow path is the refrigerant inlet of the heat exchange subsystem, and the refrigerant outlet of the refrigerant main flow path is the refrigerant outlet of the heat exchange subsystem; The refrigerant main flow path includes a first heat exchange flow path of a first heat exchanger, a first throttling device, a flash evaporator, a liquid separation device, and a second heat exchange flow path of a second heat exchanger that are sequentially connected, wherein the refrigerant outlet of the first heat exchange flow path is connected to the refrigerant inlet of the flash evaporator, and the liquid refrigerant outlet of the flash evaporator is connected to the refrigerant inlet of the second heat exchange flow path; The refrigerant branch flow path includes a second throttling device and a third heat exchange flow path of the first heat exchanger which are connected in sequence, the refrigerant inlet of the refrigerant branch flow path is connected to the gaseous refrigerant outlet of the flash evaporator, and the refrigerant outlet of the refrigerant branch flow path is connected to the refrigerant outlet of the refrigerant main flow path.

2. The heat exchange subsystem according to claim 1, characterized in that: The refrigerant branch flow path includes a control valve, and the control valve is located on the downstream side of the refrigerant outlet of the third heat exchange flow path.

3. The heat exchange subsystem according to claim 2, characterized in that: The control valve includes a one-way valve, an inlet of the one-way valve is communicated with a refrigerant outlet of the third heat exchange flow path, and an outlet of the one-way valve is communicated with a refrigerant outlet of the refrigerant branch flow path.

4. The heat exchange subsystem according to claim 2, characterized in that: The refrigerant branch flow path includes a first temperature detection device, a second temperature detection device and a control device, and the first temperature detection device, the second temperature detection device and the second throttling device are all electrically connected to the control device; The first temperature detection device is located between the gaseous refrigerant outlet of the flash evaporator and the second throttling device, and is used to detect the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path; The second temperature detection device is located at the outlet side of the control valve and is used to detect the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path; The control device is configured to control the opening degree of the second throttle device based on the temperature detected by the first temperature detection device and the temperature detected by the second temperature detection device.

5. The heat exchange subsystem according to claim 2, characterized in that: The refrigerant branch flow path includes a first pressure detection device, a second pressure detection device and a control device, and the first pressure detection device, the second pressure detection device and the second throttling device are all electrically connected to the control device; The first pressure detection device is located between the gaseous refrigerant outlet of the flash evaporator and the second throttling device, and is used to detect the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path; The second pressure detection device is located at the outlet side of the control valve and is used to detect the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path; The control device is configured to control the opening degree of the second throttle device based on the pressure detected by the first pressure detection device and the pressure detected by the second pressure detection device.

6. The heat exchange subsystem according to claim 1, characterized in that: The first throttling device includes at least one of the following: an electronic expansion valve, a capillary tube; and / or, The second throttling device includes at least one of the following: an electronic expansion valve and a capillary tube.

7. The heat exchange subsystem according to any one of claims 1 to 6, characterized in that: The refrigerant main flow path includes an air collecting device, and the air collecting device is located on the downstream side of the second heat exchange flow path.

8. A heat exchange device, characterized in that: The heat exchange device comprises the heat exchange subsystem according to any one of claims 1-7.

9. An air conditioning system, characterized in that: The air conditioning system comprises the heat exchange subsystem according to any one of claims 1-7.

10. An air conditioning device, characterized in that: The air conditioning equipment comprises the air conditioning system as claimed in claim 9.

11. A control method, characterized in that: The control method is applied to the heat exchange subsystem according to any one of claims 1 to 7, and the control method comprises: When the heat exchange subsystem is cooling the space, the opening of the second throttling device of the refrigerant branch flow path is controlled based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path; and / or, When the heat exchange subsystem is cooling the space, the opening of the second throttling device of the refrigerant branch flow path is controlled based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path.

12. The control method according to claim 11, characterized in that: The step of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path comprises: If the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, the second throttling device is controlled to increase its opening.

13. The control method according to claim 11, characterized in that: The step of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path comprises: If the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, the second throttling device is controlled to reduce the opening degree.

14. The control method according to claim 11, characterized in that: The step of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path comprises: If the refrigerant temperature at the refrigerant inlet of the refrigerant branch flow path is lower than the sum of the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path and the refrigerant temperature threshold, and is higher than the refrigerant temperature at the refrigerant outlet of the refrigerant branch flow path, the opening of the second throttling device is controlled to remain unchanged.

15. The control method according to claim 11, characterized in that: The method of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path comprises: If the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is greater than or equal to the sum of the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path and the refrigerant pressure threshold, the second throttling device is controlled to increase its opening.

16. The control method according to claim 11, characterized in that: The method of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path comprises: If the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is less than or equal to the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path, the second throttling device is controlled to reduce the opening degree.

17. The control method according to claim 11, characterized in that: The method of controlling the opening of the second throttling device of the refrigerant branch flow path based on the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path in the heat exchange subsystem and the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path comprises: If the refrigerant pressure at the refrigerant inlet of the refrigerant branch flow path is less than the sum of the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path and the refrigerant pressure threshold, and is greater than the refrigerant pressure at the refrigerant outlet of the refrigerant branch flow path, the opening of the second throttling device is controlled to remain unchanged.

18. The control method according to any one of claims 11 to 17, characterized in that: When the heat exchange subsystem includes a control valve, the control method includes: When the heat exchange subsystem is heating the space, controlling the control valve to be in a closed state; When the heat exchange subsystem is cooling the space, the control valve is controlled to be in an open state.

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