Heat exchanger and HVAC system

Abstract

Provided are a heat exchanger (10) and an HVAC system (1), the heat exchanger (10) comprising a heat exchanger main body (11) and a first refrigerant pipe (12). A first refrigerant interface (1111) is formed on the heat exchanger main body (11), and the first refrigerant pipe (12) has a first end (124) and a second end (125). The first end (124) is communicated with the first refrigerant interface (1111); and the second end (125) is used for communicating with a throttling assembly (30) for refrigerant transfer between the heat exchanger body (11) and the throttling assembly (30), the first end (124) of the first refrigerant pipe (12) being lower than the second end (125) thereof. The first end (124) of the first refrigerant pipe (12) connected to the heat exchanger body (10) is designed to be lower than the second end (125) thereof connected to the throttling assembly (30), such that when a refrigerant and lubricating oil in the first refrigerant pipe (12) is transferred from the second end (125) to the first end (124), the refrigerant and the lubricating oil will be generally transferred from top to bottom, and the refrigerant and the lubricating oil will be transferred under the dual acting force of the pressure difference provided by a compressor (20) and the self gravities of the refrigerant and the lubricating oil, thereby avoiding oil blockage.

Description

Heat exchanger and HVAC system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 4, 2023, with application number 202310985399.2 and invention name “Heat Exchanger and HVAC System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of heat exchange equipment, and in particular to a heat exchanger and a heating and ventilation system. Background Art

[0003] With the development of society and advancements in technology, HVAC products have become increasingly well-known and used by the public. In related technologies, HVAC systems such as air conditioners consist of compressors, condensers, evaporators, and throttling components. The compressor compresses the refrigerant, producing high-temperature, high-pressure refrigerant. The refrigerant then exchanges energy with the outside world at the condenser and evaporator.

[0004] In the related art, in order to increase lubrication and ensure the normal operation of the compressor, lubricating oil is provided in the compressor, and the lubricating oil will be more or less mixed into the refrigerant and transmitted together with the refrigerant.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a heat exchanger and HVAC system for improving the problem in related technologies that, under low temperature conditions, the concentration of lubricating oil increases, the viscosity increases, and the fluidity deteriorates. At this time, the lubricating oil is likely to cause pipeline blockage, hinder the transmission of refrigerant, and thus affect the normal operation of the HVAC system.

[0007] In a first aspect, an embodiment of the present application provides a heat exchanger, the heat exchanger being used to communicate with a throttling component in a HVAC system, the heat exchanger comprising:

[0008] A heat exchanger body, wherein a first refrigerant interface is formed on the heat exchanger body;

[0009] A first refrigerant tube, the first refrigerant tube having a first end and a second end, the first end being connected to the first refrigerant interface, the second end being used to be connected to the throttling component, the first refrigerant tube being used for refrigerant transmission between the throttling component and the heat exchanger body; wherein the first end of the first refrigerant tube is lower than the second end.

[0010] In some embodiments, the first refrigerant pipe includes:

[0011] The first pipeline extends from top to bottom along the refrigerant transmission direction from the second end to the first end.

[0012] In some embodiments, the first pipeline includes at least one of a first sub-pipeline, a second sub-pipeline, and a third sub-pipeline;

[0013] Along the refrigerant transmission direction from the second end to the first end, the first sub-pipeline extends vertically from top to bottom;

[0014] Along the refrigerant transmission direction from the second end to the first end, the second sub-pipeline extends obliquely from top to bottom;

[0015] Along the refrigerant transmission direction from the second end to the first end, the third sub-pipeline bends and extends from top to bottom.

[0016] In some embodiments, the first refrigerant pipe further includes a second pipe and / or a third pipe connected to the first pipe;

[0017] The second pipeline extends horizontally along the refrigerant transmission direction from the second end to the first end;

[0018] Along the refrigerant transmission direction from the second end to the first end, the third pipeline extends from bottom to top and the lowest point of the top of the third pipeline is higher than or flush with the highest point of the bottom of the third pipeline.

[0019] In some embodiments, the third pipeline includes a fourth sub-pipeline and / or a fifth sub-pipeline;

[0020] Along the refrigerant transmission direction from the second end to the first end, the fourth sub-pipeline extends obliquely from bottom to top;

[0021] Along the refrigerant transmission direction from the second end to the first end, the fifth sub-pipeline bends and extends from bottom to top.

[0022] In some embodiments, an extension direction of a portion of the first refrigerant pipe connected to the first refrigerant interface is the same as an interface direction of the first refrigerant interface.

[0023] In some embodiments, the first refrigerant interface is located at the bottom of the heat exchanger body.

[0024] In some embodiments, the heat exchanger body comprises:

[0025] A main body, wherein the main body is formed with the first refrigerant interface and a plurality of second refrigerant interfaces;

[0026] a plurality of capillary tubes, one end of each of the capillary tubes being in one-to-one communication with each of the second refrigerant interfaces;

[0027] a distributor, the distributor being connected to the other ends of the plurality of capillaries;

[0028] a liquid collecting pipe, one end of which is in communication with the distributor;

[0029] The two ends of the supercooling pipe are respectively connected to the other end of the collecting pipe and the first refrigerant interface.

[0030] In some embodiments, the subcooling tube is located at the bottom of the heat exchanger body.

[0031] In some embodiments, further comprising:

[0032] A filter is provided on the first refrigerant pipe.

[0033] In a second aspect, an embodiment of the present application provides a HVAC system, comprising:

[0034] compressor;

[0035] a first heat exchanger;

[0036] a second heat exchanger, at least one of the first heat exchanger and the second heat exchanger being the aforementioned heat exchanger; and

[0037] The throttling assembly, the compressor, the first heat exchanger, the throttling assembly and the second heat exchanger are connected in sequence.

[0038] In some embodiments, the throttling assembly includes an electronic expansion valve.

[0039] The heat exchanger and HVAC system of the present application are designed to design the first refrigerant pipe of the heat exchanger so that the first end connected to the heat exchanger body is lower than the second end connected to the throttling component. In this way, when the refrigerant and lubricating oil in the first refrigerant pipe are transmitted from the second end toward the first end, the refrigerant and lubricating oil will be transmitted roughly from top to bottom. At this time, the refrigerant and lubricating oil will be transmitted under the dual forces of the pressure difference provided by the compressor and the self-gravity of the refrigerant and lubricating oil, making the transmission of the refrigerant and lubricating oil in the first refrigerant pipe smoother, less prone to oil blockage problems, and achieving normal operation of the HVAC system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] FIG1 is a schematic diagram of the refrigerant flow structure of a HVAC system in cooling mode provided by an embodiment of the present application;

[0042] FIG2 is a schematic diagram of the refrigerant flow structure of the HVAC system shown in FIG1 in the heating mode;

[0043] FIG3 is a schematic diagram of the connection structure of the heat exchanger and the throttling assembly provided in the first embodiment of the present application;

[0044] FIG4 is a schematic structural diagram of a first refrigerant pipe in a heat exchanger provided in a second embodiment of the present application;

[0045] FIG5 is a schematic diagram of the connection structure of the heat exchanger and the throttling assembly provided in the third embodiment of the present application;

[0046] FIG6 is a schematic diagram of the connection structure of the heat exchanger and the throttling assembly provided in the fourth embodiment of the present application;

[0047] FIG7 is a partial structural diagram of a HVAC system provided in another embodiment of the present application.

[0048] Description of reference numerals:

[0049] 1. HVAC system;

[0050] 10. Heat exchanger; 10a. First heat exchanger; 10b. Second heat exchanger;

[0051] 11. Heat exchanger body; 111. Main body; 1111. First refrigerant interface; 1112. Second refrigerant interface; 112. Capillary tube; 113. Distributor; 114. Liquid collecting pipe; 115. Subcooling pipe;

[0052] 12, first refrigerant pipe; 121, first pipeline; 1211, first sub-pipeline; 1212, second sub-pipeline; 1213, third sub-pipeline; 122, second pipeline; 123, third pipeline; 1231, fourth sub-pipeline; m, lowest point; n, highest point; 1233, top line segment; 1234, bottom line segment; 124, first end; 125, second end;

[0053] 13. Filter;

[0054] 14. Second refrigerant pipe;

[0055] 20. Compressor;

[0056] 30. Throttle assembly;

[0057] 40. Four-way valve;

[0058] 50. High pressure irrigation. DETAILED DESCRIPTION

[0059] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0060] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0061] Referring to Figures 1 and 2 , an embodiment of the present application provides a HVAC system 1 . The HVAC system 1 includes a heating or cooling system such as an air conditioner, a multi-split unit, or a heat pump, but the present application is not limited thereto. The following description will use the HVAC system 1 including the air conditioner as an example.

[0062] The HVAC system 1 includes a first heat exchanger 10a, a second heat exchanger 10b, a compressor 20, and a throttling assembly 30. The compressor 20, the first heat exchanger 10a, the throttling assembly 30, and the second heat exchanger 10b are sequentially connected. The compressor 20 compresses the refrigerant, the first heat exchanger 10a and the second heat exchanger 10b exchange heat between the refrigerant and the outside world, and the throttling assembly 30 throttles and reduces pressure.

[0063] The throttling assembly 30 can be any throttling assembly known in the art. For example, the throttling assembly 30 can be an electronic expansion valve, a throttle valve, etc., without limitation. In the embodiment of the present application, the throttling assembly 30 comprises an electronic expansion valve. The electronic expansion valve is driven by a controller, and has a short switching time from a fully closed state to a fully open state, a fast response and operation speed, and no static superheat phenomenon. Furthermore, the opening and closing characteristics and speed can be manually set, making it more flexible.

[0064] The second heat exchanger 10b can be disposed in the indoor unit of the HVAC system 1, while the compressor 20, the first heat exchanger 10a and the throttling assembly 30 can be disposed in the outdoor unit of the HVAC system 1. The HVAC system 1 has a cooling mode and a heating mode.

[0065] Referring to Figure 1, in the refrigeration mode, the compressor 20 outputs high-temperature and high-pressure gaseous refrigerant, which is transmitted to the first heat exchanger 10a and undergoes condensation and heat exchange to become a high-pressure, normal-temperature liquid refrigerant. The high-pressure, normal-temperature liquid refrigerant is further transmitted to the throttling component 30 and undergoes throttling and pressure reduction to become a low-temperature, low-pressure gas-liquid mixed refrigerant. The low-temperature, low-pressure gas-liquid mixed refrigerant then enters the second heat exchanger 10b and undergoes evaporation and heat exchange to become a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows back to the compressor 20, completing a complete refrigeration cycle.

[0066] Referring to Figure 2, in the heating mode, the compressor 20 outputs high-temperature and high-pressure gaseous refrigerant, which is transmitted to the second heat exchanger 10b and undergoes condensation and heat exchange to become a high-pressure, normal-temperature liquid refrigerant. The high-pressure, normal-temperature liquid refrigerant is further transmitted to the throttling component 30 and undergoes throttling and pressure reduction to become a low-temperature, low-pressure gas-liquid mixed refrigerant. The low-temperature, low-pressure gas-liquid mixed refrigerant then enters the first heat exchanger 10a and undergoes evaporation and heat exchange to become a low-temperature, low-pressure gaseous refrigerant. Finally, the low-temperature, low-pressure gaseous refrigerant flows back to the compressor 20, completing a complete heating cycle.

[0067] It should be noted that the HVAC system 1 may further include a four-way valve 40, which is used to switch the forward and reverse flow direction of the refrigerant. For example, in cooling mode, the refrigerant flow path is: compressor 20 - four-way valve 40 - first heat exchanger 10a - throttling assembly 30 - second heat exchanger 10b - four-way valve 40 - compressor 20; while in heating mode, the refrigerant flow path is: compressor 20 - four-way valve 40 - second heat exchanger 10b - throttling assembly 30 - first heat exchanger 10a - four-way valve 40 - compressor 20.

[0068] Among them, in order to increase lubrication and ensure the normal operation of the compressor 20, a lubricating oil is provided in the compressor 20, and the lubricating oil will be more or less mixed into the refrigerant and transmitted together with the refrigerant. Under low temperature conditions, the concentration of the lubricating oil will increase, the viscosity will increase, and the fluidity will deteriorate. At this time, the lubricating oil is likely to cause pipe blockage, hinder the transmission of the refrigerant, and further affect the normal operation of the HVAC system 1. For example, in the cooling mode, the refrigerant transmitted between the throttling component 30 and the second heat exchanger 10b is in a low temperature state, which is likely to cause the problem of lubricating oil blocking the pipe. For another example, in the heating mode, the refrigerant transmitted between the throttling component 30 and the first heat exchanger 10a is in a low temperature state, which is likely to cause the problem of lubricating oil blocking the pipe. In addition, if a lubricating oil that is insoluble or difficult to dissolve with the refrigerant is used, it is also likely to cause pipe blockage, hinder the transmission of the refrigerant, and affect the normal operation of the HVAC system 1. Based on this, an embodiment of the present application provides a heat exchanger 10 for improving the problem of easy clogging of the pipe between the throttling assembly 30 and the heat exchanger 10. The heat exchanger 10 can be used in the first heat exchanger 10a and / or the second heat exchanger 10b in the HVAC system 1, and can be flexibly designed according to needs, without limitation. Optionally, the heat exchanger 10 in the embodiment of the present application is used for both the first heat exchanger 10a and the second heat exchanger 10b, and the first heat exchanger 10a and the second heat exchanger 10b can adopt the same structure or different structures.

[0069] Specifically, referring to Figures 1 to 3, the heat exchanger 10 of the embodiment of the present application is used to communicate with the throttling component 30 in the HVAC system 1. The heat exchanger 10 includes a heat exchanger body 11 and a first refrigerant pipe 12, wherein a first refrigerant interface 1111 is formed on the heat exchanger body 11, and the first refrigerant pipe 12 has a first end 124 and a second end 125. The first end 124 is connected to the first refrigerant interface 1111, and the second end 125 is connected to the throttling component 30. The first refrigerant pipe 12 is used for refrigerant transmission between the throttling component 30 and the heat exchanger body 11.

[0070] Among them, the first end 124 is lower than the second end 125, and the first refrigerant tube 12 of the heat exchanger 10 is designed to connect the first end 124 of the heat exchanger body 11 to be lower than the second end 125 connected to the throttling assembly 30. In this way, when the refrigerant and lubricating oil in the first refrigerant tube 12 are transmitted from the second end 125 toward the first end 124, the refrigerant and lubricating oil will be transmitted roughly from top to bottom. At this time, the refrigerant and lubricating oil will be transmitted under the dual forces of the pressure difference provided by the compressor 20 and the self-gravity of the refrigerant and lubricating oil, so that the transmission of the refrigerant and lubricating oil in the first refrigerant tube 12 is smoother, and oil blockage is less likely to occur, thereby realizing the normal operation of the HVAC system 1.

[0071] 3 and 4 , the first refrigerant pipe 12 includes a first pipeline 121 . The first pipeline 121 extends from top to bottom along the refrigerant transmission direction from the throttling assembly 30 to the heat exchanger body 11 .

[0072] It is worth mentioning that along the refrigerant transmission direction from the throttling assembly 30 to the heat exchanger body 11, the first pipeline 121 extends from top to bottom, so that the refrigerant and lubricating oil in the first refrigerant pipe 12 can not only be transmitted backward under the pressure difference of the compressor 20, but also can be transmitted backward under the action of its own gravity. Compared with the refrigerant and lubricating oil being transmitted backward only under the pressure difference of the compressor 20, the driving force of the refrigerant and lubricating oil during backward transmission is increased, which can speed up the transmission speed of the refrigerant and lubricating oil.

[0073] The first pipeline 121 includes at least one of a first sub-pipeline 1211, a second sub-pipeline 1212, and a third sub-pipeline 1213. The first sub-pipeline 1211 extends vertically from top to bottom along the refrigerant transmission direction from the throttle assembly 30 to the heat exchanger body 11. The second sub-pipeline 1212 extends obliquely from top to bottom along the refrigerant transmission direction from the throttle assembly 30 to the heat exchanger body 11. The third sub-pipeline 1213 extends in a curved manner from top to bottom along the refrigerant transmission direction from the throttle assembly 30 to the heat exchanger body 11.

[0074] In which, vertical can be understood as: along the refrigerant transmission direction from the throttling component 30 to the heat exchanger main body 11, the slope of the extension direction of the first sub-pipeline 1211 is zero. Tilted can be understood as: along the refrigerant transmission direction from the throttling component 30 to the heat exchanger main body 11, the slope of the extension direction of the second sub-pipeline 1212 is a fixed value, and the fixed value is not equal to zero. And curved can be understood as: along the refrigerant transmission direction from the throttling component 30 to the heat exchanger main body 11, the slope of the extension direction of the third sub-pipeline 1213 is a variable value. The change value can change from small to large, from large to small, first from small to large and then from large to small, or first from large to small and then from small to large, etc., and there is no limitation on this. In which, the curve can also be a circular arc curve, etc., and there is no limitation on this.

[0075] It can be understood that the shape of the first pipeline 121 can be varied. For example, the first pipeline 121 can include only the first sub-pipeline 1211, or only the second sub-pipeline 1212, or only the third sub-pipeline 1213, or the first sub-pipeline 1211 and the second sub-pipeline 1212, or the first sub-pipeline 1211 and the third sub-pipeline 1213, or the second sub-pipeline 1212 and the third sub-pipeline 1213, or the first sub-pipeline 1211, the second sub-pipeline 1212 and the third sub-pipeline 1213. The specific shape of the first pipeline 121 can be flexibly designed in combination with specific needs (for example, space margin, etc.).

[0076] Furthermore, the first refrigerant pipe 12 may also include a second pipe 122 and / or a third pipe 123 connected to the first pipe 121; wherein, along the refrigerant transmission direction from the throttling assembly 30 to the heat exchanger body 11, the second pipe 122 extends horizontally; along the refrigerant transmission direction from the throttling assembly 30 to the heat exchanger body 11, the third pipe 123 extends from bottom to top and the lowest point m of the top of the third pipe 123 is higher than or flush with the highest point n of the bottom of the third pipe 123.

[0077] Referring to Figure 4, along the refrigerant transmission direction from the throttling assembly 30 to the heat exchanger body 11, the third pipeline 123 extends from bottom to top and the lowest point m of the top of the third pipeline 123 is higher than or flush with the highest point n of the bottom of the third pipeline 123. It can be understood that: the projection of the third pipeline 123 in the first reference plane includes a relative top line segment 1233 and a bottom line segment 1234, and the lowest point m of the top line segment 1233 is higher than the highest point n of the bottom line segment 1234, or the lowest point m of the top line segment 1233 and the highest point n of the bottom line segment 1234 are on the same horizontal line; wherein, the first reference plane is a vertical plane parallel to the central axis of the third pipeline 123, which can be understood as the plane parallel to the paper surface in Figure 4.

[0078] Among them, along the refrigerant transmission direction from the throttling component 30 to the heat exchanger body 11, the lowest point m of the top line segment 1233 can be located at the starting point of the top line segment 1233, and along the refrigerant transmission direction from the throttling component 30 to the heat exchanger body 11, the highest point n of the bottom line segment 1234 can be located at the end point of the bottom line segment 1234. In this way, the lowest point m of the top line segment 1233 and the highest point n of the bottom line segment 1234 will roughly determine the extension length of the third pipeline 123.

[0079] In order to reduce the difficulty of forming the first refrigerant tube 12, along the refrigerant transmission direction, the first refrigerant tube 12 can be regarded as a pipeline with a roughly unchanged flow surface for refrigerant transmission. It can be further understood that the distance r between the top line segment 1233 and the bottom line segment 1234 in the refrigerant transmission direction remains unchanged. In this way, the difference between the lowest point m of the top line segment 1233 and the highest point n of the bottom line segment 1234 will roughly determine the amplitude of the third pipeline 123's upward curvature from bottom to top. Specifically, if the lowest point m of the top line segment 1233 and the highest point n of the bottom line segment 1234 are located on the same horizontal plane, it can be understood that the amplitude of the third pipeline 123's upward curvature from bottom to top is roughly equal to the distance r between the top line segment 1233 and the bottom line segment 1234, and the distance r between the top line segment 1233 and the bottom line segment 1234 can be roughly regarded as the inner diameter of the third pipeline 123; if the lowest point m of the top line segment 1233 is higher than the highest point n of the bottom line segment 1234, it can be understood that the amplitude of the third pipeline 123's upward curvature from bottom to top is less than the distance r between the top line segment 1233 and the bottom line segment 1234, that is, less than the inner diameter of the third pipeline 123.

[0080] Based on the above analysis, the tilting amplitude of the third pipe 123 in the embodiment of the present application is less than or equal to the inner diameter of the third pipe 123, and its tilting amplitude is smaller than the vertical upward tilting amplitude of the U-shaped tube in the related technology. The refrigerant and lubricating oil transmitted in the third pipe 123 with a smaller tilting amplitude can be pushed backward under the compression provided by the compressor 20 to avoid oil blockage.

[0081] The third pipeline 123 includes at least one of a fourth sub-pipeline 1231 and a fifth sub-pipeline (not shown). The fourth sub-pipeline 1231 extends obliquely from bottom to top along the refrigerant transport direction from the throttle assembly 30 to the heat exchanger body 11. The fifth sub-pipeline extends in a curved manner from bottom to top along the refrigerant transport direction from the throttle assembly 30 to the heat exchanger body 11. The inclination and curvature have been explained above and will not be repeated here.

[0082] It can be understood that the shape of the third pipeline 123 can be varied. For example, the third pipeline 123 can include only the fourth sub-pipeline 1231, or only the fifth sub-pipeline, or the fourth sub-pipeline 1231 and the fifth sub-pipeline. The specific shape of the third pipeline 123 can be flexibly designed in combination with specific needs (for example, space margin, etc.).

[0083] Referring to Figures 3 to 7, in the heat exchanger 10 of the embodiment of the present application, when the refrigerant flows from the throttling assembly 30 to the heat exchanger body 11, the first pipeline 121 will guide the refrigerant and lubricating oil to be transmitted from top to bottom, the second pipeline 122 will guide the refrigerant and lubricating oil to be transmitted horizontally, and the third pipeline 123 will guide the refrigerant and lubricating oil to be transmitted very slightly from bottom to top, so that the refrigerant and lubricating oil transmitted in the first pipeline 121, the second pipeline 122 and the third pipeline 123 can be transmitted backward under the pressure difference provided by the compressor 20. Compared with the first refrigerant pipe using a U-shaped pipe in the related art, when the compressor 20 provides the same pressure difference, the transmission of the refrigerant and lubricating oil in the first refrigerant pipe 12 of the embodiment of the present application will be smoother, and oil blockage problems will not easily occur, thereby achieving normal operation of the HVAC system 1.

[0084] It can be understood that the shape of the first refrigerant pipe 12 in the embodiment of the present application can be varied. For example, the first refrigerant pipe 12 can include only the first pipe 121, or include the first pipe 121 and the second pipe 122, or include the first pipe 121 and the third pipe 123, or include the first pipe 121, the second pipe 122 and the third pipe 123, etc. The specific shape of the first refrigerant pipe 12 can be flexibly designed in combination with specific needs (for example, space margin, etc.).

[0085] In an embodiment of the present application, the throttling assembly 30 is located above the first refrigerant interface 1111. At this time, the first refrigerant pipe 12 includes a first pipeline 121, so that the refrigerant and lubricating oil can be transmitted backward under the dual driving forces of the pressure difference of the compressor 20 and the gravity of the refrigerant and lubricating oil when flowing in the first pipeline 121, thereby improving the transmission speed of the refrigerant and lubricating oil in the first pipeline 121. At the same time, under the dual driving force, the refrigerant and lubricating oil can also be at a higher transmission speed when flowing out of the first pipeline 121, which is beneficial to improving the inertia force of the refrigerant and lubricating oil when entering the next second pipeline 122 and / or the third pipeline 123, thereby allowing the refrigerant and lubricating oil to be smoothly transmitted in the next second pipeline 122 and / or the third pipeline 123, without the occurrence of oil blockage.

[0086] If the throttle assembly 30 is located above the first refrigerant interface 1111, in order to expand the adjustable range of the throttle assembly 30, so that the throttle assembly 30 can be installed in a wider range of locations and applied in more scenarios, the first refrigerant interface 1111 can be located at the bottom of the heat exchanger body 11. That is, the lower setting position of the first refrigerant interface 1111 can expand the adjustable range of the throttle assembly 30 compared to the higher setting position of the first refrigerant interface 1111.

[0087] To facilitate the connection between the first refrigerant pipe 12 and the heat exchanger body 11, the extension direction of the portion of the first refrigerant pipe 12 connected to the first refrigerant interface 1111 can be the same as the interface orientation of the first refrigerant interface 1111. For example, if the interface orientation of the first refrigerant interface 1111 is in a horizontal direction, the first refrigerant pipe 12 can be connected to the first refrigerant interface 1111 via the second pipe 122. For another example, if the interface orientation of the first refrigerant interface 1111 is in an inclined direction, the first refrigerant pipe 12 may include a second sub-pipeline 1212 extending in the interface orientation of the first refrigerant interface 1111, and the first refrigerant pipe 12 is connected to the first refrigerant interface 1111 via the second sub-pipeline 1212; or the first refrigerant pipe 12 may include a fourth sub-pipeline 1231 extending in the interface orientation of the first refrigerant interface 1111, and the first refrigerant pipe 12 is connected to the first refrigerant interface 1111 via the fourth sub-pipeline 1231.

[0088] The heat exchanger body 11 in the embodiment of the present application can be any heat exchanger in the related art, and is not limited to this. For example, referring to Figures 3 and 5, the heat exchanger body 11 includes a body 111, multiple capillary tubes 112, a distributor 113, a liquid collecting pipe 114, and a subcooling pipe 115. The body 111 is formed with a first refrigerant interface 1111 and multiple second refrigerant interfaces 1112. One end of the multiple capillary tubes 112 is connected to the multiple second refrigerant interfaces 1112 in a one-to-one correspondence. The other end of the multiple capillary tubes 112 is connected to the distributor 113. One end of the liquid collecting pipe 114 is connected to the distributor 113, and the other end of the liquid collecting pipe 114 is connected to the first refrigerant interface 1111 through the subcooling pipe 115.

[0089] The main body 111 may include a plurality of pipes and a plurality of heat dissipation fins. The pipes are used to transmit refrigerant. The heat dissipation fins are arranged on the outside of the pipes and in contact with the pipes to increase the surface area of ​​the pipes and improve the heat transfer effect of the heat exchanger main body 11. The pipes may include reciprocatingly bent copper pipes, etc., which are not limited to this.

[0090] The distributor 113 has the function of evenly distributing the refrigerant. By connecting the plurality of capillary tubes 112 to the distributor 113, the refrigerant can be evenly distributed in each capillary tube 112, thereby achieving uniform heat exchange in each area of ​​the heat exchanger 10 and improving the heat exchange performance of the heat exchanger 10. The subcooling tube 115 enhances the heat exchange effect, increases the degree of subcooling, and improves the cooling capacity of the HVAC system 1.

[0091] Furthermore, the subcooling tube 115 is located at the bottom of the heat exchanger body 11. Since the subcooling tube 115 is connected to the first refrigerant interface 1111, its placement at the bottom of the heat exchanger body 11 allows the first refrigerant interface 1111, to which the subcooling tube 115 is connected, to be located at the bottom of the heat exchanger body 11. Based on the above analysis, the location of the first refrigerant interface 1111 at the bottom of the heat exchanger 10 expands the range within which the throttling assembly 30 can be positioned. Furthermore, when the subcooling tube 115 is located at the bottom of the heat exchanger body 11, a pipe fitting is provided on one side (e.g., the top) of the subcooling tube 115, resulting in a better heat exchange effect compared to having pipe fittings on both sides.

[0092] Referring to Figure 3, the heat exchanger 10 may also include a second refrigerant pipe 14 connected to the heat exchanger body 11. If the first refrigerant pipe 12 is used for refrigerant input into the heat exchanger body 11, the second refrigerant pipe 14 can be used for refrigerant output from the heat exchanger body 11; if the first refrigerant pipe 12 is used for refrigerant output from the heat exchanger body 11, the second refrigerant pipe 14 can be used for refrigerant input into the heat exchanger body 11.

[0093] Referring to Figures 6 and 7 , heat exchanger 10 further includes a filter 13 , which is disposed on first refrigerant pipe 12 . Filter 13 is used to filter impurities from the refrigerant. Filter 13 can be disposed in any of first pipe 121 , second pipe 122 , or third pipe 123 . The design can be flexible based on specific circumstances and is not limited in this embodiment of the present application.

[0094] If the heat exchanger 10 is used for both the first heat exchanger 10a and the second heat exchanger 10b, the structure of the first refrigerant tube 12 in the first heat exchanger 10a and the second heat exchanger 10b can be substantially the same. The first refrigerant tube 12 can be detachably connected to the heat exchanger body 11. If the structure of the first refrigerant tube 12 in the first heat exchanger 10a and the second heat exchanger 10b is substantially the same, only one mold specification is required to produce the first refrigerant tube 12 for both the first heat exchanger 10a and the second heat exchanger 10b, thereby reducing manufacturing costs.

[0095] Referring to Figure 7 , the HVAC system 1 may further include a high-pressure tank 50, which may be in communication with the heat exchanger 10. When the HVAC system 1 includes two heat exchangers 10, the high-pressure tank 50 may be in communication with one of the two heat exchangers 10, without limitation. The high-pressure tank 50 may be in communication with the first refrigerant pipe 12 of the heat exchanger 10 without requiring an additional interface to be provided on the heat exchanger body 11. The extending direction of the connecting pipeline between the high-pressure tank 50 and the heat exchanger 10 to which it is connected may satisfy the following requirements: in the direction from the high-pressure tank 50 to the heat exchanger 10 to which it is connected, the pipeline may extend from top to bottom and / or extend horizontally.

[0096] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to at least two, for example, two, three, four, etc. "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0097] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A heat exchanger, the heat exchanger being arranged to communicate with a throttling component in a HVAC system, wherein: The heat exchanger comprises: A heat exchanger body, wherein a first refrigerant interface is formed on the heat exchanger body; A first refrigerant tube, the first refrigerant tube having a first end and a second end, the first end being connected to the first refrigerant interface, the second end being configured to be connected to the throttling component, the first refrigerant tube being configured to transmit refrigerant between the throttling component and the heat exchanger body; wherein the first end of the first refrigerant tube is lower than the second end.

2. The heat exchanger according to claim 1, wherein: The first refrigerant pipe comprises: The first pipeline extends from top to bottom along a refrigerant transmission direction from the second end to the first end.

3. The heat exchanger according to claim 2, wherein: The first pipeline includes at least one of a first sub-pipeline, a second sub-pipeline and a third sub-pipeline; Along the refrigerant transmission direction from the second end to the first end, the first sub-pipeline extends vertically from top to bottom; Along the refrigerant transmission direction from the second end to the first end, the second sub-pipeline extends obliquely from top to bottom; Along the refrigerant transmission direction from the second end to the first end, the third sub-pipeline extends in a curved manner from top to bottom.

4. The heat exchanger according to claim 2 or 3, wherein: The first refrigerant pipe further includes a second pipeline and / or a third pipeline connected to the first pipeline; The second pipeline extends horizontally along the refrigerant transmission direction from the second end to the first end; Along the refrigerant transmission direction from the second end to the first end, the third pipeline extends from bottom to top and the lowest point of the top of the third pipeline is higher than or flush with the highest point of the bottom of the third pipeline.

5. The heat exchanger according to claim 4, wherein: The third pipeline includes a fourth sub-pipeline and / or a fifth sub-pipeline; Along the refrigerant transmission direction from the second end to the first end, the fourth sub-pipeline extends obliquely from bottom to top; Along the refrigerant transmission direction from the second end to the first end, the fifth sub-pipeline bends and extends from bottom to top.

6. The heat exchanger according to any one of claims 1 to 5, wherein: The extending direction of the portion of the first refrigerant pipe connected to the first refrigerant interface is the same as the interface direction of the first refrigerant interface.

7. The heat exchanger according to any one of claims 1 to 6, wherein: The first refrigerant interface is located at the bottom of the heat exchanger body.

8. The heat exchanger according to any one of claims 1 to 7, wherein: The heat exchanger body comprises: A body, wherein the body is formed with the first refrigerant interface and a plurality of second refrigerant interfaces; A plurality of capillary tubes, one end of each of the capillary tubes being connected to each of the second refrigerant interfaces in a one-to-one correspondence; A distributor, the distributor being connected to the other ends of the plurality of capillaries; A liquid collecting pipe, one end of which is connected to the distributor; A supercooling pipe, both ends of which are respectively connected to the other end of the collecting pipe and the first refrigerant interface.

9. The heat exchanger according to claim 8, wherein: The subcooling pipe is located at the bottom of the heat exchanger body.

10. The heat exchanger according to any one of claims 1 to 9, wherein: Also includes: A filter is disposed on the first refrigerant pipe.

11. A heating and ventilation system, wherein: include: compressor; a first heat exchanger; a second heat exchanger, wherein at least one of the first heat exchanger and the second heat exchanger is a heat exchanger described in any one of weights 1 to 10; and The throttling assembly, the compressor, the first heat exchanger, the throttling assembly and the second heat exchanger are connected in sequence.

12. The HVAC system according to claim 11, wherein: The throttling component includes an electronic expansion valve.

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