Refrigerant switching device and heating, ventilation, and air conditioning system

Abstract

The application discloses a refrigerant switching device and a heating and ventilation system. The refrigerant switching device comprises a shell, a gas pipe assembly and a liquid pipe assembly arranged at least partially in the internal space of the shell, the liquid pipe assembly comprising a liquid control valve, a first pipe and a second pipe, the liquid control valve controlling the flow rate or opening and closing of the flow path of the liquid pipe assembly, the liquid control valve comprising a heat source side connecting portion and a load side connecting portion; the first pipe is connected to the heat source side connecting portion, the first pipe is closer to the heat source unit than the liquid control valve, and the main body portion of the first pipe is arranged on a first horizontal plane; the second pipe is connected to the load side connecting portion, and the main body portion of the second pipe is arranged on a second horizontal plane; and the second horizontal plane is arranged above the first horizontal plane in a spaced manner. The technical scheme can realize miniaturization and compactness of the liquid pipe assembly and improve the space utilization rate of the refrigerant switching device.

Description

Technical Field

[0001] This application relates to the field of heating, ventilation and air conditioning (HVAC) equipment technology, and in particular to a refrigerant switching device and an HVAC system. Background Technology

[0002] Currently, HVAC systems are widely used in office buildings and shopping malls. An HVAC system generally includes a heat source unit, a refrigerant switching device, and multiple load units. The main function of the refrigerant switching device is to enable the load units to switch between different modes. The heat source unit and each load unit are connected to the refrigerant switching device through liquid and gas pipes, thereby achieving cooling and heating through the exchange of heat exchange media.

[0003] In related technologies, refrigerant switching devices include liquid pipe assemblies, which occupy a lot of space and are not conducive to integrating more structures and realizing more functions in the refrigerant switching device. Utility Model Content

[0004] This application provides a refrigerant switching device and a heating, ventilation and air conditioning system that can achieve miniaturization and compactness of liquid pipe components, reducing the space occupied.

[0005] In a first aspect, embodiments of this application propose a refrigerant switching device, including a housing and a gas pipe assembly and a liquid pipe assembly at least partially disposed within the internal space of the housing, wherein the liquid pipe assembly includes:

[0006] A liquid control valve controls the flow rate or opening and closing of the flow path of the liquid pipe assembly, and the liquid control valve includes a heat source side connection and a load side connection.

[0007] The first pipeline is connected to the heat source side connection part. The first pipeline is closer to the heat source unit than the liquid control valve. The main body of the first pipeline is set on the first horizontal plane.

[0008] The second pipeline is connected to the load-side connection part, and the main body of the second pipeline is disposed on the second horizontal plane;

[0009] The second horizontal plane is positioned above the first horizontal plane at intervals.

[0010] In one embodiment, the first pipeline includes at least one liquid manifold and a plurality of liquid branch pipes communicating with the liquid manifold. The liquid manifold extends along a first direction and is spaced apart from the liquid control valve along a second direction. The liquid branch pipes extend along the second direction. One end of each liquid branch pipe in the second direction is connected to a heat source side connection portion, and the other end is connected to the liquid manifold. The first direction is parallel to the first horizontal plane, and the first direction and the second direction are perpendicular to each other.

[0011] In one embodiment, the load-side connection extends along a vertical direction, which is perpendicular to the first direction and the second direction, and the load-side connection is spaced apart above the first horizontal plane, while the heat source-side connection extends along the second direction close to the liquid manifold;

[0012] The first pipeline includes a first main pipe and a first transition section. The first main pipe is located on the first horizontal plane, and the first transition section extends upward from the first main pipe to the heat source side connection section.

[0013] The second pipeline includes a second main pipe and a second transition section. The second main pipe is located on the second horizontal plane, and the second transition section extends upward from the second main pipe to the load-side connection section.

[0014] In one embodiment, the second pipeline includes a first filter tube and a third transition section, the first filter tube being located on the first horizontal plane, and the third transition section extending downward from the second main tube to the first horizontal plane and connecting to the first filter tube.

[0015] In one embodiment, the second pipeline further includes a load-side liquid pipe and a fourth transition section. The load-side liquid pipe is higher than the second horizontal plane and extends along the second direction. One end of the fourth transition section is connected to the first filter pipe, and the other end extends upward and connects to the load-side liquid pipe.

[0016] In one embodiment, the first filter tube is located on the side of the liquid manifold away from the liquid control valve.

[0017] In one embodiment, the second main tube includes a clearance portion that bypasses the first transition portion, and the remaining portion of the second main tube is located on the vertical plane where the load-side connection portion and the heat source connection portion are located.

[0018] In one embodiment, the number of liquid manifolds is three: a main liquid manifold, a cooling branch liquid manifold, and a heating branch liquid manifold. The main liquid manifold is used to communicate with the heat source unit. The cooling branch liquid manifold and the heating branch liquid manifold branch from the main liquid manifold branch. Two liquid branches are formed from each of the first main manifolds, which are defined as a branch liquid manifold and a bypass liquid manifold, respectively. Each branch liquid manifold is connected to the heating branch liquid manifold and is configured to flow unidirectionally from the branch liquid manifold to the heating branch liquid manifold. Each bypass liquid manifold is connected to the cooling branch liquid manifold and is configured to flow unidirectionally from the cooling branch liquid manifold to the bypass liquid manifold.

[0019] In one embodiment, one end of the main liquid pipe in the first direction is connected to one end of the refrigeration branch liquid pipe in the first direction, and the other end of the refrigeration branch liquid pipe in the first direction is a closed end; and / or

[0020] The main liquid pipe is connected at one end in the first direction to the heating branch liquid pipe at one end in the first direction, and the heating branch liquid pipe at the other end in the first direction is a closed end.

[0021] In one embodiment, the main liquid pipe, the cooling branch liquid pipe, and the heating branch liquid pipe are all located on the first horizontal plane.

[0022] In one embodiment, at least a portion of the branch fluid conduit and at least a portion of the bypass fluid conduit are arranged side by side.

[0023] In one embodiment, the main liquid pipe, the cooling branch liquid pipe, and the heating branch liquid pipe are spaced apart along the second direction, and the bypass liquid pipe has a bend that bends upward past the heating branch liquid pipe to connect with the cooling branch liquid pipe.

[0024] In one embodiment, the curved portion is not higher than the second horizontal plane.

[0025] In one embodiment, the first main tube further includes a tee tube, one end of which is connected to the first transition portion, and the other two ends of which are respectively connected to the branch liquid tube and the bypass liquid tube;

[0026] The tee pipe is located on the first horizontal plane.

[0027] In one embodiment, the portion of the first transition section located on the first horizontal plane connects the branch fluid pipe and the bypass fluid pipe, and the portion of the first transition section located on the first horizontal plane is arranged to meander along a second direction.

[0028] In one embodiment, a second filter tube is provided between the first transition portion and the heat source side connection portion.

[0029] In one embodiment, the branch liquid pipe, the bypass liquid pipe, and the second main pipe are located in different vertical planes.

[0030] In one embodiment, the second pipeline includes a load-side liquid pipe, the load-side liquid pipe and the liquid control valve are spaced apart, and the main body portion of the first pipeline and the main body portion of the second pipeline are located between the load-side liquid pipe and the liquid control valve;

[0031] The load-side liquid pipe and the liquid control valve are above the second horizontal plane.

[0032] In one embodiment, the housing includes a housing body and a chassis. The chassis is disposed at the bottom of the housing body and is detachably connected to the housing body. The liquid pipe assembly is connected to the housing body and is spaced apart from the chassis.

[0033] In one embodiment, the housing further includes a liquid pipe crossbeam, which is connected to the heat source side connection portion and to the housing body.

[0034] In one embodiment, a pressure relief assembly is further included, the pressure relief assembly comprising:

[0035] The main pressure relief pipe extends in the first direction;

[0036] Multiple pressure relief branch pipes are spaced apart along the first direction, and each pressure relief branch pipe extends along a second direction, with one end connected to the main pressure relief pipe and the other end connected to the second pipeline; and

[0037] Pressure relief valve is installed in the main pressure relief pipe or the branch pressure relief pipe;

[0038] Wherein, the first direction and the second direction are perpendicular to each other.

[0039] In one embodiment, the main body of the pressure relief manifold is located on the first horizontal plane, and the main body of the pressure relief branch pipe is located on the second horizontal plane.

[0040] In one embodiment, the main body of the first pipeline branches into two liquid branches, which are defined as a branch liquid pipe and a bypass liquid pipe, respectively. The branch liquid pipe, the bypass liquid pipe, and the pressure relief branch pipe are located in different vertical planes.

[0041] In one embodiment, the main body of the first pipeline branches into two liquid branches, defined as a branch liquid pipe and a bypass liquid pipe, respectively. The pressure relief branch pipe is located in the same vertical plane as either the branch liquid pipe or the bypass liquid pipe.

[0042] Secondly, embodiments of this application propose a heating, ventilation, and air conditioning system, comprising:

[0043] Heat source unit;

[0044] Load unit; and

[0045] The refrigerant switching device as described in any of the preceding claims, wherein the liquid pipe assembly and the gas pipe assembly of the refrigerant switching device are connected to the heat source unit and the load unit.

[0046] Based on the above embodiments, in this application embodiment, the first and second pipelines are located between the liquid control valve and the load unit, forming a circuitous flow path. Compared to placing the liquid control valve between the first and second pipelines, this method allows for structural folding, reducing the overall length of the liquid pipe assembly. Furthermore, the main body of the first and second pipelines is separated, making the structure clearer and eliminating the need for excessive consideration of complex structures during production and assembly. Moreover, the main body of the first and second pipelines are respectively positioned on a first horizontal plane and a second horizontal plane. This arrangement of the main structural parts of the liquid pipe assembly on two horizontal planes not only further simplifies the structure but also makes the liquid pipe assembly more compact, reducing its thickness and effectively miniaturizing the space it occupies. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of an embodiment of the HVAC system of this application;

[0049] Figure 2 This is an overall schematic diagram of an embodiment of the refrigerant switching device of this application;

[0050] Figure 3 for Figure 2 Exploded structural diagram of the refrigerant switching device;

[0051] Figure 4 This is a schematic diagram of the structure of an embodiment of the endotracheal tube assembly and the fluid tube assembly of this application;

[0052] Figure 5 This is a side view of an embodiment of the liquid tubing assembly of this application;

[0053] Figure 6 This is a schematic diagram of a portion of the structure of an embodiment of the liquid tubing assembly of this application;

[0054] Figure 7 This is a schematic diagram of the assembly structure of the endotracheal tube assembly and the liquid tube assembly of this application;

[0055] Figure 8 This is a schematic diagram of another embodiment of the liquid tubing assembly of this application;

[0056] Figure 9This is a schematic diagram of a portion of the structure of an embodiment of the liquid pipe assembly and pressure relief assembly of this application;

[0057] Figure 10 This is a schematic diagram of the structure of an embodiment of the supercooling component of this application;

[0058] Figure 11 A diagram showing the refrigerant flow direction in the refrigerant switching device provided in this application embodiment when all load units are in cooling mode;

[0059] Figure 12 A diagram showing the refrigerant flow direction in the refrigerant switching device provided in this application embodiment when all load units are in heating mode;

[0060] Figure 13 A diagram showing the refrigerant flow direction in the refrigerant switching device provided in this application embodiment when all load units are in main cooling mode;

[0061] Figure 14 A diagram showing the refrigerant flow direction in the refrigerant switching device provided in this application embodiment when all load units are in main heating mode.

[0062] Explanation of icon numbers:

[0063] 100. Refrigerant switching device; 10. Shell; 11. Shell body; 111. Top plate; 112. Side plate; 1121. Load-side side plate; 112a. Load-side port; 1122. Heat-source-side side plate; 112b. Heat-source-side port; 1123. Electrical control-side side plate; 12. Chassis; 131. Liquid pipe crossbeam; 20. Liquid pipe assembly; 21. Liquid control valve; 211. Load-side connection; 212. Heat-source-side connection; 22. First pipeline; 22a. Liquid manifold; 22b. Liquid branch pipe; 221. Main liquid pipe; 222. Refrigeration branch liquid pipe; 223. Heating branch liquid pipe; 224. First transition section; 225. Branch liquid pipe; 226. Bypass liquid pipe; 227. Bend 23. Curved section; 231. Second main pipe; 2311. Refrigeration section; 232. Load side liquid pipe; 233. Second transition section; 234. Third transition section; 235. Fourth transition section; 24. First filter pipe; 25. Second filter pipe; 30. Gas pipe assembly; 31. Low-pressure gas pipe; 32. High-pressure gas pipe; 33. Bypass gas pipe; 34. Branch gas pipe; 35. Gas branch pipe; 351. Gas shut-off valve; 40. Pressure relief assembly; 41. Pressure relief main pipe; 42. Pressure relief valve; 43. Pressure relief branch pipe; 50. Subcooling assembly; 51. Heat exchanger; 52. Electronic expansion valve; 53. Main inlet pipe; 54. Main outlet pipe; 55. Auxiliary pipe connection; 56. T-junction connection.

[0064] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0066] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0067] 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 construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0068] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0069] Currently, HVAC systems are widely used in office buildings and shopping malls. An HVAC system generally includes a heat source unit, a refrigerant switching device, and multiple load units. The main function of the refrigerant switching device is to enable the load units to switch between different modes of cooling and heating. The heat source unit and each load unit are connected to the refrigerant switching device through liquid pipes and gas pipes, thereby realizing a refrigerant cooling cycle or a refrigerant heating cycle.

[0070] In related technologies, refrigerant switching devices include liquid pipe assemblies, which occupy a lot of space and are not conducive to integrating more structures and realizing more functions in the refrigerant switching device.

[0071] To address the aforementioned issues, this application proposes a refrigerant switching device located on the refrigerant circuit between a heat source unit and a load unit. The heat source unit can be installed in an outdoor space or an indoor space (such as an equipment room), while the load unit is installed in an indoor space requiring temperature control. The refrigerant switching device can be installed in the same indoor space requiring temperature control as the load unit, or it can be installed in an independent space. No specific restrictions are placed on the installation environment of the refrigerant switching device.

[0072] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0073] Reference Figures 1 to 3 In some embodiments of this application, the refrigerant switching device 100 includes a housing 10, a gas pipe assembly 30, and a liquid pipe assembly 20, with at least a portion of the gas pipe assembly 30 and the liquid pipe assembly 20 disposed within the interior space of the housing 10.

[0074] The outer contour of the housing 10 can be rectangular. The housing 10 is used to support components such as the liquid pipe assembly 20, the gas pipe assembly 30, and the pressure relief assembly 40. The housing 10 can be made of alloys or metals such as aluminum or steel to meet requirements such as structural strength and long service life. Of course, the housing 10 can also be made of plastic to meet requirements such as lighter weight; this application does not impose any restrictions on this. The housing 10 provides protection and is compatible with the connection structure of the installation environment.

[0075] At least a portion of the tracheal assembly 30 is disposed within the internal space of the housing 10, meaning that the tracheal assembly 30 may be entirely located within the housing 10, or it may extend partially to connect to the heat source unit and the load unit respectively. The tracheal assembly 30 is used to form an air passage connection between the heat source unit and the load unit.

[0076] At least a portion of the liquid conduit assembly 20 is disposed within the internal space of the housing 10; that is, the liquid conduit assembly 20 may be entirely located within the housing 10, or it may extend partially to connect to the heat source unit and the load unit, respectively. The liquid conduit assembly 20 is used to form a liquid passage connection between the heat source unit and the load unit.

[0077] Understandably, through the gas-liquid flow between the heat source unit, the load unit, and the refrigerant switching device 100, the HVAC system can realize multiple functions such as heating and cooling. The refrigerant switching device 100 controls or selectively controls the on / off of the gas circuit components and the liquid circuit components to allocate the above functions.

[0078] The liquid pipe assembly 20 includes a liquid control valve 21, a first pipe 22, and a second pipe 23. The liquid control valve 21 controls the flow rate or opening and closing of the flow path of the liquid pipe assembly 20. The liquid control valve 21 includes a heat source side connection 212 and a load side connection 211. The first pipe 22 is connected to the heat source side connection 212 and is closer to the heat source unit than the liquid control valve 21. The main body of the first pipe 22 is disposed on a first horizontal plane V1. The second pipe 23 is connected to the load side connection 211 and is disposed on a second horizontal plane V2. The second horizontal plane V2 is disposed above the first horizontal plane V1.

[0079] Understandably, when the liquid control valve 21 is open, the working fluid can flow from the heat source unit through the first pipeline 22, through the liquid control valve 21, and then through the second pipeline 23 to the load unit, or the working fluid can flow from the load unit through the second pipeline 23, through the liquid control valve 21, and then through the first pipeline 22 to the heat source unit.

[0080] In this embodiment, the first pipe 22 and the second pipe 23 are located between the liquid control valve 21 and the load unit, forming a circuitous flow path. Compared to the liquid control valve 21 being located between the first pipe 22 and the second pipe 23, this arrangement allows for structural folding, reducing the overall length of the liquid pipe assembly 20. Furthermore, the main body of the first pipe 22 and the main body of the second pipe 23 are separated, making the structure clearer and eliminating the need for excessive consideration of complex structures during production and assembly. Moreover, the main body of the first pipe 22 and the main body of the second pipe 23 are respectively located on a first horizontal plane V1 and a second horizontal plane V2. This arrangement of the main structural parts of the liquid pipe assembly 20 on two horizontal planes not only further simplifies the structure but also makes the liquid pipe assembly 20 more compact, reducing its thickness and effectively miniaturizing the space it occupies.

[0081] It should be noted that, in the embodiments of this application, the pipeline portion located on the horizontal plane refers to the central axis of the pipeline being located on that horizontal plane. For example, the central axis of the main body of the first pipeline 22 is located on the first horizontal plane V1.

[0082] Combination Figures 4 to 6In some embodiments, the first pipeline 22 includes at least one liquid manifold 22a and a plurality of liquid branch pipes 22b communicating with the liquid manifold 22a. The liquid manifold 22a extends along a first direction and is spaced apart from the liquid control valve 21 along a second direction. The liquid branch pipes 22b extend along the second direction. One end of each liquid branch pipe 22b in the second direction is connected to a heat source side connection 212, and the other end is connected to the liquid manifold 22a. The first direction is parallel to the first horizontal plane V1, and the first and second directions are perpendicular to each other. By arranging the liquid manifold 22a to connect to the plurality of liquid branch pipes 22b, the pipeline length of each liquid branch pipe 22b is reduced, thereby effectively reducing costs and further solving the problem of high cost in the refrigerant switching device 100, thus meeting the requirements of low-cost production. In addition, the liquid manifold 22a and the liquid branch pipes 22b extending along the mutually perpendicular first and second directions respectively make the structure of the liquid pipe assembly 20 clearer and more compact.

[0083] In one structural implementation of the liquid pipe assembly 20, the number of liquid manifolds 22a is one. By setting a single liquid manifold, the structure of the liquid pipe assembly 20 is simpler, easier to install, and the volume of the refrigerant switching device 100 is reduced.

[0084] In another structural implementation of the liquid pipe assembly 20, there are three liquid manifolds: a main liquid pipe 221, a cooling branch liquid pipe 222, and a heating branch liquid pipe 223. The main liquid pipe 221 is used to connect with the heat source unit. The cooling branch liquid pipe 222 and the heating branch liquid pipe 223 are branched from the main liquid pipe 221. Two liquid branches are formed from each liquid branch pipe 22b, which are defined as a branch liquid pipe 225 and a bypass liquid pipe 226, respectively. Each branch liquid pipe 225 is connected to the heating branch liquid pipe 223 and is configured to flow unidirectionally from the branch liquid pipe 225 to the heating branch liquid pipe 223. Each bypass liquid pipe 226 is connected to the cooling branch liquid pipe 222 and is configured to flow unidirectionally from the cooling branch liquid pipe 222 to the bypass liquid pipe 226.

[0085] The main liquid pipe 221 extends at least partially outside the housing 10 to communicate with the heat source unit. The cooling branch liquid pipe 222 and the heating branch liquid pipe 223 are located inside the housing 10 and are both connected to the main liquid pipe 221. Each liquid branch pipe 22b is connected to the cooling branch liquid pipe 222 and the heating branch liquid pipe 223.

[0086] Combination Figure 6In one embodiment, the load-side connection 211 extends along a vertical direction, which is perpendicular to the first and second directions. Exemplarily, both the first and second directions are located in a horizontal plane, and the vertical direction can be a vertical direction. The load-side connection 211 is spaced apart above the first horizontal plane V1, and the heat source-side connection 212 extends along the second direction close to the liquid manifold 22a. The different orientations of the heat source-side connection 212 and the load-side connection 211 facilitate pipeline assembly and connection. Furthermore, the fact that the load-side connection 211 extends along the vertical direction and the heat source-side connection 212 extends along the second direction close to the liquid manifold 22a not only reduces the length of the first pipeline 22 and the second pipeline 23, but also keeps the load-side connection 211 and the heat source-side connection 212 in a vertical plane perpendicular to the first direction, thereby reducing space occupation and making the liquid pipe assembly 20 more compact.

[0087] Specifically, the first pipeline 22 includes a first main pipe and a first transition section 224. The first main pipe is located on a first horizontal plane V1 and is the main body of the liquid branch pipe 22b. It branches into a branch liquid pipe 225 and a bypass liquid pipe 226. The first transition section 224 is located at one end of the first main pipe near the liquid control valve 21 and extends upward from the first main pipe to the heat source side connection section 212. The second pipeline 23 includes a second main pipe 231 and a second transition section 233. The second main pipe 231 is located on a second horizontal plane V2, and the second transition section 233 extends upward from the second main pipe 231 to the load side connection section 211.

[0088] Combination Figure 5 and Figure 6 In one embodiment, branch liquid pipes 225 and bypass liquid pipes 226 are formed from each of the first main pipe branches. Each branch liquid pipe 225 is connected to a heating branch liquid pipe 223 and is configured to flow unidirectionally from the branch liquid pipe 225 to the heating branch liquid pipe 223. Each bypass liquid pipe 226 is connected to a cooling branch liquid pipe 222 and is configured to flow unidirectionally from the cooling branch liquid pipe 222 to the bypass liquid pipe 226. The refrigerant switching device 100 includes a heating mode and a cooling mode. In the heating mode, the refrigerant flows unidirectionally from the cooling branch liquid pipe 222 to the bypass liquid pipe 226, and then from the bypass liquid pipe 226 through the liquid pipe control valve and the second pipe 23 to the load unit for heat exchange. In the cooling mode, the refrigerant flows unidirectionally from the second pipe 23 through the liquid pipe control valve and the branch liquid pipe 225 to the heating branch liquid pipe 223.

[0089] One end of the main liquid pipe 221 in the first direction is connected to one end of the refrigeration branch liquid pipe 222 in the first direction, and the other end of the refrigeration branch liquid pipe 222 in the first direction is a closed end; moreover, the other end of the main liquid pipe 221 in the first direction is connected to one end of the heating branch liquid pipe 223 in the first direction, and the other end of the heating branch liquid pipe 223 in the first direction is a closed end to prevent refrigerant leakage.

[0090] Furthermore, the main liquid pipe 221, the refrigeration branch liquid pipe 222, and the heating branch liquid pipe 223 are all located on the first horizontal plane V1. The main liquid pipe 221, the refrigeration branch liquid pipe 222, and the heating branch liquid pipe 223 are arranged side by side at intervals along the second direction. Arranging the main liquid pipe 221, the refrigeration branch liquid pipe 222, and the heating branch liquid pipe 223 in the same plane is beneficial for production and structural design. It also allows as much of the structure of the first pipeline 22 as possible to be arranged on the first horizontal plane V1, resulting in a simpler and more compact structure and reducing the space occupied in the vertical direction.

[0091] Combination Figure 6 In one embodiment, at least a portion of the branch liquid pipe 225 and at least a portion of the bypass liquid pipe 226 are arranged side by side and both extend along the second direction, thereby making the structure of the first pipe 22 simpler and more compact.

[0092] The main liquid pipe 221, the cooling branch liquid pipe 222, and the heating branch liquid pipe 223 are arranged side-by-side at intervals along the second direction. The cooling branch liquid pipe 222 is located on the side of the heating branch liquid pipe 223 away from the liquid control valve 21, and the main liquid pipe 221 is located on the side of the cooling branch liquid pipe 222 away from the heating branch liquid pipe 223. In one embodiment, the bypass liquid pipe 226 is provided with a bend 227, which bends upward over the heating branch liquid pipe 223 to connect with the cooling branch liquid pipe 222. Providing an upward bend 227 to pass over the heating branch liquid pipe 223 avoids the need for more pipework and prevents the bend 227 from interfering with the bottom of the housing 10 downward, making the structure more compact.

[0093] Furthermore, the bend 227 is not higher than the second horizontal plane V2. That is, the top of the bend 227 can be located at the second horizontal plane V2, or the top of the bend 227 can be located between the first horizontal plane V1 and the second horizontal plane V2. By ensuring that the bend 227 is not higher than the second horizontal plane V2, the space occupied by the first pipe 22 in the vertical direction can be reduced.

[0094] Please refer to Figure 6 In one embodiment, the first main body pipe further includes a tee pipe located on the first horizontal plane V1. One end of the tee pipe is connected to the first transition portion 224, and the other two ends of the tee pipe are respectively connected to the branch liquid pipe 225 and the bypass liquid pipe 226. The tee pipe can be an integral structure for ease of manufacturing. Connecting the branch liquid pipe 225, the bypass liquid pipe 226, and the first transition portion 224 through the tee pipe results in a simple and effective structure.

[0095] In one embodiment, the portion of the first transition section 224 located on the first horizontal plane V1 connects the branch liquid pipe 225 and the bypass liquid pipe 226, and the portion of the first transition section 224 located on the first horizontal plane V1 is arranged in a meandering manner along the second direction. As shown in the figure, one end of the portion of the first transition section 224 located on the first horizontal plane V1 is connected to one end of the tee pipe, and the other end is located on one side of the first main pipe along the second direction, and directly below the heat source side connection portion 212. The remaining portion of the first transition section 224 extends upward and connects to the heat source side connection portion 212. The portion of the first transition section 224 located on the first horizontal plane V1 is U-shaped, so that the portion of the first transition section 224 located on the first horizontal plane V1 occupies less space in the first direction, thereby reducing the overall size of the liquid pipe assembly 20 in the first direction. At the same time, the U-shaped bend also makes the first transition section 224 less affected by stress concentration while extending meanderingly, extending the structural life and improving the structural reliability.

[0096] In one embodiment, the end of the second conduit 23 furthest from the liquid control valve 21 is used to connect to the load unit. At the end of the second conduit 23 closest to the load unit, the second conduit 23 also includes a first filter tube 24 and a third transition section 234. The first filter tube 24 removes mechanical impurities and contaminants from the conduit, ensuring smooth refrigerant flow and preventing blockages from affecting the normal operation of the HVAC system. The first filter tube 24 is located on a first horizontal plane V1, and the third transition section 234 extends downward from the second main body tube 231 to the first horizontal plane V1 and connects to the first filter tube 24. Figure 5 and Figure 7 The first filter tube 24 is positioned downwards on the first horizontal plane V1, creating a height difference between the first filter tube 24 and the second horizontal plane V2. This provides space for some of the air tube components 30 on the first filter tube 24, facilitating disassembly and assembly and avoiding interference. Furthermore, the first horizontal plane V1 is closer to the bottom of the housing 10, allowing for easy maintenance of the first filter tube 24 by removing the bottom casing of the housing 10, thus improving work efficiency.

[0097] Optionally, the first filter tube 24 is located on the side of the liquid manifold 22a away from the liquid control valve 21. The liquid manifold 22a is located on the first horizontal plane V1. To avoid conflict, the first filter tube 24 is located to the side of the liquid manifold 22a. This location on the side of the liquid manifold 22a away from the liquid control valve 21 avoids the third transition section 234 from turning too sharply with other parts of the second main pipe 231, which would be inconvenient to manufacture. This reduces the structural complexity of the second pipeline 23 and allows it to be as close as possible to the load unit, thereby ensuring the filtration effect.

[0098] In one embodiment, a second filter pipe 25 is provided between the first transition portion 224 and the heat source side connection portion 212. The second filter pipe 25 removes mechanical impurities and contaminants from the pipeline, ensuring smooth refrigerant flow, preventing blockages from affecting the normal operation of the HVAC system, and improving the reliability of the HVAC system.

[0099] Furthermore, the second conduit 23 also includes a load-side liquid conduit 232 and a fourth transition section 235. The load-side liquid conduit 232 extends along the second direction for connection to the load unit. The load-side liquid conduit 232 is higher than the second horizontal plane V2, thus allowing it to be offset vertically from the air conduit portion of the air conduit assembly 30 for connection to the load unit, facilitating connection. One end of the fourth transition section 235 is connected to the first filter tube 24, and the other end extends upward to connect to the load-side liquid conduit 232.

[0100] like Figure 7 As shown in this embodiment, the load-side liquid pipe 232 and the liquid control valve 21 are spaced apart. The main body of the first pipe 22 and the main body of the second pipe 23 are located between the load-side liquid pipe 232 and the liquid control valve 21. The load-side liquid pipe 232 and the liquid control valve 21 are higher than the second horizontal plane V2. The load-side liquid pipe 232 and the gas pipe assembly 30 are staggered vertically for easy connection. The liquid control valve 21 is closer to the top of the housing 10, and the liquid control valve 21 can be easily inspected and disassembled by removing the top cover of the housing 10. The load-side liquid pipe 232 and the liquid control valve 21 are higher than the second horizontal plane V2 and higher than the main body of the first pipe 22 and the main body of the second pipe 23 located between them. This allows the liquid pipe assembly 20 to enclose an installation space, and the gas pipe assembly 30 is installed within the installation space. This allows the gas pipe assembly 30 and the liquid pipe assembly 20 to be stacked, making the structure more compact, improving space utilization, and reducing the overall volume of the refrigerant switching device 100.

[0101] Combination Figure 6 In one embodiment, one end of the second main tube 231 is connected to the vertically downward load-side connection portion 211, and the second main tube 231 extends towards the load unit along a second direction, while the heat source-side connection portion 212 and the load-side connection portion 211 are on the same vertical plane. The second main tube 231 includes a clearance portion 2311 that bypasses the first transition portion 224, and the remaining portion of the second main tube 231 is located on the vertical plane where the load-side connection portion 211 and the heat source-side connection portion are located. Thus, by avoiding the first transition portion 224 through the clearance portion 2311, interference between the first pipe 22 and the second pipe 23 is avoided. The portion of the second main tube 231 other than the clearance portion 2311 is located on the vertical plane where the load-side connection portion 211 and the heat source-side connection portion are located, thereby making the liquid pipe assembly 20 more compact and reducing space occupation.

[0102] Optionally, the branch liquid pipe 225, the bypass liquid pipe 226, and the second main body pipe 231 are located on different vertical planes. As shown in the figure, the portions of the branch liquid pipe 225, the bypass liquid pipe 226, and the second main body pipe 231, excluding the avoidance portion 2311, are spaced apart in the first direction and all extend along the second direction. In this way, not only can interference between the branch liquid pipe 225, the bypass liquid pipe 226, and the second main body pipe 231 be effectively avoided, but also any one of the branch liquid pipe 225, the bypass liquid pipe 226, and the second main body pipe 231 can be observed when the bottom of the housing 10 is removed, so as to facilitate maintenance and other operations.

[0103] like Figure 3 As shown, in one embodiment, the housing 10 includes a housing body 11 and a chassis 12. The chassis 12 is disposed at the bottom of the housing body 11 and is detachably connected to the housing body 11. The liquid pipe assembly 20 is connected to the housing body 11 and is spaced apart from the chassis 12.

[0104] The shell body 11 has a cover structure and includes a top plate 111 and multiple side plates 112 surrounding the top plate 111. The top plate 111 is disposed opposite to the chassis 12. The multiple side plates 112 define downward-facing openings. The chassis 12 covers the openings and is detachably connected to the shell body 11. The chassis 12 and the shell body 11 together form an installation cavity. It should be noted that the multiple side plates 112 include a load-side side plate 1121, a heat-source-side side plate 1122, and an electrical control-side side plate 1123. A load-side pipe port 112a is provided on the load-side side plate 1121 for a pipe connected to the load unit to pass through, and a heat-source-side pipe port 112b is provided on the heat-source-side side plate 1122 for a pipe connected to the heat-source unit to pass through. The electrical control components of the refrigerant switching device 100 are mounted on the chassis 12 and disposed near the electrical control-side side plate 1123. The detachable connection between the chassis 12 and the shell body 11 can be a connection between the chassis 12 and multiple side plates 112. Specifically, a protruding connecting lug or other structure can be provided on the chassis 12, and the structure can be detachably connected to the chassis 12 by a screw or other threaded structure to achieve a detachable connection between the chassis 12 and the shell body 11.

[0105] Specifically, the refrigerant switching device 100 is defined to have a length direction and a width direction. Multiple side plates 112 may include two first side plates 112 arranged opposite each other along the length direction and two second side plates 112 arranged opposite each other along the width direction. The two second side plates 112 are connected between the ends of the two first side plates 112 to form a downward-facing opening. A chassis 12 is detachably connected to the multiple side plates 112 to cover the opening, thereby suspending the liquid pipe assembly 20 above the chassis 12, allowing direct maintenance of the liquid pipe assembly 20 when the chassis 12 is disassembled.

[0106] Furthermore, combined Figure 3 and Figure 8 The housing 10 also includes a liquid pipe crossbeam 131, which connects to the heat source side connection portion 212 and is connected to the housing body 11. The heat source side connection portion 212 of the liquid control valve 21 extends horizontally, thereby providing a connection base for the liquid pipe assembly 20 to the liquid pipe crossbeam 131. The gap below the heat source side connection portion 212 allows the crossbeam to pass through, resulting in a high degree of structural and functional integration and a more compact design.

[0107] Of course, the liquid pipe crossbeam 131 can also be directly connected to the shell body 11 to ensure that the liquid pipe assembly 20 can be stably located inside the shell body 11, which will not be elaborated here.

[0108] Please refer to Figure 1 and Figure 9 In some embodiments, the refrigerant switching device 100 further includes a pressure relief assembly 40, which includes a pressure relief main pipe 41, multiple pressure relief branch pipes 43, and a pressure relief valve 42. The pressure relief main pipe 41 extends along a first direction and is connected to the heat source unit. The multiple pressure relief branch pipes 43 are spaced apart along the first direction. The pressure relief branch pipes 43 extend along a second direction, with one end connected to the pressure relief main pipe 41 and the other end connected to the second pipeline 23. The pressure relief valve 42 is installed on the pressure relief main pipe 41 or the pressure relief branch pipes 43.

[0109] The main pressure relief pipe 41 and the branch pressure relief pipe 43 can be made of copper, aluminum alloys or metals, or steel, to meet the requirements of structural strength and long service life, and to ensure pressure relief stability.

[0110] Optionally, the pressure relief valve 42 is designed to operate within a specific pressure range to ensure the safe operation of the system. Its operation is as follows: when the pressure in the pipeline exceeds a first preset pressure value, the pressure relief valve 42 will open, allowing refrigerant to pass through to relieve the pressure in the pipeline. When the pressure drops below a second preset pressure value, the pressure relief valve 42 will close, stopping the release of refrigerant. This design can prevent the system from being damaged or causing safety hazards due to excessive pressure, helping to improve the stability and safety of the system.

[0111] Optionally, the pressure relief valve 42 is configured as a one-way valve, allowing refrigerant to flow unidirectionally from the load unit to the heat source unit. The one-way valve design of the pressure relief valve 42 helps ensure unidirectional refrigerant flow within the system, thereby maintaining normal system operation and pressure balance.

[0112] Reference Figure 9Optionally, the pressure relief valve 42 is installed on the pressure relief main pipe 41. Since installing the pressure relief valve 42 only on the pressure relief main pipe 41 can effectively reduce the number of pressure relief valves 42, it can not only reduce the number of pressure relief valves 42 and reduce costs, but also eliminate the need for the gas pipe assembly 30 and liquid pipe assembly 20 of the refrigerant switching device 100 to avoid the pressure relief valve 42. This allows the gas pipe assembly 30 and liquid pipe assembly 20 to be installed close together, making the internal structure of the refrigerant switching device 100 more compact and saving the internal space of the housing 10. This reduces the size requirement of the refrigerant switching device 100 and makes it suitable for various installation environments.

[0113] Alternatively, each pressure relief branch pipe 43 may be equipped with a pressure relief valve 42 to relieve pressure on the flow path of a specific leaking load unit, thereby achieving precise control of the refrigerant flow path of each load unit.

[0114] In one embodiment, the main pressure relief pipe 41 is located on the first horizontal plane V1, and the branch pressure relief pipe 43 is located on the second horizontal plane V2, so that the branch pressure relief pipe 43 can be connected to the second pipeline 23. Setting the main pressure relief pipe 41 on the first horizontal plane V1 and the branch pressure relief pipe 43 on the second horizontal plane V2 helps to make the pressure relief assembly 40 and the liquid pipe assembly 20 more compact as a whole, reducing space occupation.

[0115] Optionally, the branch liquid pipe 225, the bypass liquid pipe 226, and the pressure relief branch pipe 43 are located on different vertical planes, so that after the chassis 12 is removed, the branch liquid pipe 225, the bypass liquid pipe 226, and the pressure relief branch pipe 43 can be directly observed, and maintenance operations such as inspection and repair of the branch liquid pipe 225, the bypass liquid pipe 226, and the pressure relief branch pipe 43 can be conveniently performed, thereby improving work efficiency.

[0116] Or combination Figure 9 The pressure relief branch pipe 43 is located on the same vertical plane as any one of the branch liquid pipe 225 and the bypass liquid pipe 226. In the embodiment shown in the figure, the pressure relief branch pipe 43 and the branch liquid pipe 225 are located on the same vertical plane, which can reduce the size of the pressure relief assembly 40 and the liquid pipe assembly 20 in the first direction and reduce the space occupation.

[0117] This embodiment also provides a heating, ventilation, and air conditioning system, including the refrigerant switching device 100 described in the above embodiments. The structure of the refrigerant switching device 100 has been described in detail in the above embodiments and will not be repeated here.

[0118] The gas manifold assembly 30 includes a gas manifold and multiple gas branch pipes 35. The gas manifold extends along a first direction, and the multiple parallel gas branch pipes 35 converge at the gas manifold. The gas manifold is closer to the heat source unit than each individual gas branch pipe 35. By setting the gas manifold to converge multiple parallel gas branch pipes 35, the length of each gas branch pipe 35 is reduced, thereby effectively reducing costs. It should be noted that in one embodiment, the gas manifold can be a single pipeline. In another embodiment, the gas manifold includes a high-pressure gas pipe 32 and a low-pressure gas pipe 31, branching from the gas branch pipes 35 to form two gas branches, defined as a bypass gas pipe 33 and a branch gas pipe 34, respectively. The bypass gas pipe 33 is connected to the low-pressure gas pipe 31, and the branch gas pipe 34 is connected to the high-pressure gas pipe 32. Both the low-pressure gas pipe 31 and the high-pressure gas pipe 32 are at least partially located inside the housing 10, and both extend outside the housing 10 to facilitate communication with the heat source unit. A gas branch pipe 35 is equipped with a gas shut-off valve 351, which closes or opens the connection between the gas branch pipe 35 and the load unit. It is understood that the high-pressure gas pipe 32 is primarily responsible for receiving the high-pressure gaseous heat exchange medium from the heat source unit, which is then transported to the load unit via the subsequent branch gas pipe 34. The low-pressure gas pipe 31 is responsible for transporting the low-pressure gaseous heat exchange medium from the load unit back to the heat source unit via the bypass gas pipe 33 and the branch gas pipe 34. In a multi-split system, the low-pressure refrigerant generated by each load unit returns to the heat source unit through the low-pressure gas pipe 31, absorbs heat in the evaporator, and is then compressed again by the compressor. This cycle allows the HVAC system to continuously provide cooling.

[0119] like Figure 10 As shown, in some structural configurations, the refrigerant switching device 100 further includes a subcooling assembly 50. The subcooling assembly 50 is housed within the housing 10 and is connected to the refrigerant branch pipe 222 and the main pipe 221. The subcooling assembly 50 is used to increase the subcooling degree of the refrigerant flowing from the main pipe 221 to the refrigerant branch pipe 222, bringing it closer to saturation, thereby increasing the efficiency of the refrigeration cycle. This allows for the provision of more cooling capacity under the same operating conditions, improving the performance and energy efficiency ratio of the HVAC system.

[0120] Furthermore, the subcooling assembly 50 includes a heat exchanger 51, an electronic expansion valve 52, a main inlet pipe 53, a main outlet pipe 54, an auxiliary pipe 55, and a tee pipe 56. The heat exchanger 51 has a main flow path and an auxiliary flow path. The heat exchange medium in the auxiliary flow path is used to cool the heat exchange medium in the main flow path. By dividing the heat exchanger 51 into a main flow path and an auxiliary flow path, and utilizing the heat exchange medium in the auxiliary flow path to cool the heat exchange medium in the main flow path, the efficiency of the heat exchanger 51 can be effectively improved. This internal circulation design allows the refrigeration system to make fuller use of the refrigerant's heat, improving refrigeration efficiency and thus achieving a faster and more energy-efficient refrigeration process.

[0121] In addition, the HVAC system provided in this embodiment should also include a heat source unit and multiple load units. The load units may include, but are not limited to, ceiling-mounted units, duct units, wall-mounted air conditioning load units, and floor-standing air conditioning load units, etc. The following describes the refrigerant flow of the HVAC system provided in this embodiment under different modes using four load units as an example.

[0122] Please combine Figures 11 to 14 , Figure 11 This is a refrigerant flow diagram for each load unit in the HVAC system provided in the embodiments of this application, all in cooling mode. Figure 12 A refrigerant flow diagram for each load unit in the heating system provided in this application embodiment, all in heating mode. Figure 13 This application provides a diagram showing the refrigerant flow direction of a majority of load units in a heating, ventilation, and air conditioning system under cooling conditions, as provided in the embodiments of this application. Figure 14 This is a refrigerant flow diagram for a majority of load units in a heating / ventilation system provided in an embodiment of this application, under heating conditions. For ease of description, [the diagram is shown here]. Figure 11 The operating mode of the load unit shown is called full cooling mode. Figure 12 The operating mode of the load unit shown is called full heating mode. Figure 13 The operating mode of the load unit shown is called the main cooling mode. Figure 14 The operating mode of the load unit shown is called the main heating mode.

[0123] like Figure 11 As shown, in full refrigeration mode, the refrigerant flows as follows: heat source unit → main liquid pipe 221 → heat exchanger 51 → refrigeration branch liquid pipe 222 → bypass liquid pipe 226 → second pipe 23 → load unit → gas branch pipe 35 → bypass gas pipe 33 → low-pressure gas pipe 31 → heat source unit. This completes one refrigeration cycle.

[0124] like Figure 12As shown, in full heating mode, the refrigerant flows as follows: heat source unit → high-pressure gas pipe 32 → branch gas pipe 34 → gas branch pipe 35 → load unit → second pipe 23 → branch liquid pipe 225 → refrigerant branch liquid pipe 222 → main liquid pipe 221 → heat source unit. This completes one heating cycle.

[0125] like Figure 13 As shown, in the main cooling mode, the refrigerant flows as follows: heat source unit → high-pressure gas pipe 32 → branch gas pipe 34 → gas branch pipe 35 → load unit → second pipe 23 → branch liquid pipe 225 → cooling branch liquid pipe 222 → main liquid pipe 221 → heat source unit. This completes one heating cycle.

[0126] For the load unit in refrigeration mode, the refrigerant flow direction is always: heat source unit → main liquid pipe 221 → heat exchanger 51 → refrigeration branch liquid pipe 222 → bypass liquid pipe 226 → branch liquid pipe 225 → second pipe 23 → load unit → gas branch pipe 35 → bypass gas pipe 33 → low-pressure gas pipe 31 → heat source unit. After the refrigerant flows out of the heat exchanger 51, a portion will be diverted along the electronic expansion valve 52 → auxiliary pipe 55 → low-pressure gas pipe 31 → heat source unit. In this way, one refrigeration cycle is completed.

[0127] like Figure 14 As shown, in the main heating mode, the refrigerant flows as follows: heat source unit → high-pressure gas pipe 32 → branch gas pipe 34 → gas branch pipe 35 → load unit → second pipe 23 → branch liquid pipe 225 → refrigerant branch liquid pipe 222 → main liquid pipe 221 → heat source unit. This completes one heating cycle.

[0128] For the load unit in cooling mode, during operation in heating mode, when the refrigerant flows to the main liquid pipe 221, a portion is diverted to the heat exchanger 51. The refrigerant flow direction is: heat exchanger 51 → cooling branch liquid pipe 222 → bypass liquid pipe 226 → branch liquid pipe 225 → second pipe 23 → load unit → gas branch pipe 35 → bypass gas pipe 33 → low-pressure gas pipe 31 → heat source unit. After the refrigerant flows out of the heat exchanger 51, a portion is diverted along the electronic expansion valve 52 → auxiliary pipe 55 → low-pressure gas pipe 31 → heat source unit. This completes one refrigeration cycle.

[0129] It should be noted that, taking the four load units in this embodiment as an example, in the main cooling mode, three load units can be cooling and one load unit can be heating; in the main heating mode, three load units can be heating and one load unit can be cooling. Here, no specific restrictions are placed on the number of load units or the actual cooling mode.

[0130] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0131] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A refrigerant switching device, characterized in that, The system includes a housing and a gas tube assembly and a liquid tube assembly, each at least partially disposed within the interior space of the housing. The liquid tube assembly includes: A liquid control valve controls the flow rate or opening and closing of the flow path of the liquid pipe assembly, and the liquid control valve includes a heat source side connection and a load side connection. The first pipeline is connected to the heat source side connection part. The first pipeline is closer to the heat source unit than the liquid control valve. The main body of the first pipeline is set on the first horizontal plane. The second pipeline is connected to the load-side connection part, and the main body of the second pipeline is disposed on the second horizontal plane; The second horizontal plane is positioned above the first horizontal plane at intervals.

2. The refrigerant switching device as described in claim 1, characterized in that, The first pipeline includes at least one liquid manifold and a plurality of liquid branch pipes connected to the liquid manifold. The liquid manifold extends along a first direction and is spaced apart from the liquid control valve along a second direction. The liquid branch pipes extend along the second direction. One end of each liquid branch pipe in the second direction is connected to a heat source side connection, and the other end is connected to the liquid manifold. The first direction is parallel to the first horizontal plane, and the first direction and the second direction are perpendicular to each other.

3. The refrigerant switching device as described in claim 2, characterized in that, The load-side connection extends along a vertical direction, which is perpendicular to the first direction and the second direction. The load-side connection is spaced apart above the first horizontal plane, and the heat source-side connection extends along the second direction close to the liquid manifold. The first pipeline includes a first main pipe and a first transition section. The first main pipe is located on the first horizontal plane, and the first transition section extends upward from the first main pipe to the heat source side connection section. The second pipeline includes a second main pipe and a second transition section. The second main pipe is located on the second horizontal plane, and the second transition section extends upward from the second main pipe to the load-side connection section.

4. The refrigerant switching device as described in claim 3, characterized in that, The second pipeline includes a first filter tube and a third transition section. The first filter tube is located on the first horizontal plane, and the third transition section extends downward from the second main tube to the first horizontal plane and connects with the first filter tube.

5. The refrigerant switching device as described in claim 4, characterized in that, The second pipeline also includes a load-side liquid pipe and a fourth transition section. The load-side liquid pipe is higher than the second horizontal plane and extends along the second direction. One end of the fourth transition section is connected to the first filter pipe, and the other end extends upward and connects to the load-side liquid pipe.

6. The refrigerant switching device as described in claim 5, characterized in that, The first filter tube is located on the side of the liquid manifold away from the liquid control valve.

7. The refrigerant switching device as described in claim 3, characterized in that, The second main tube includes a clearance portion that bypasses the first transition portion, and the remaining portion of the second main tube is located on the vertical plane where the load-side connection portion and the heat source connection portion are located.

8. The refrigerant switching device as described in claim 3, characterized in that, The number of liquid manifolds is three: a main liquid manifold, a cooling branch liquid manifold, and a heating branch liquid manifold. The main liquid manifold is used to connect to the heat source unit. The cooling branch liquid manifold and the heating branch liquid manifold branch from the main liquid manifold branch. Two liquid branches are formed from each of the first main manifolds, which are defined as a branch liquid manifold and a bypass liquid manifold, respectively. Each branch liquid manifold is connected to the heating branch liquid manifold and is configured to flow from the branch liquid manifold to the heating branch liquid manifold. Each bypass liquid manifold is connected to the cooling branch liquid manifold and is configured to flow from the cooling branch liquid manifold to the bypass liquid manifold.

9. The refrigerant switching device as described in claim 8, characterized in that, One end of the main liquid pipe in the first direction is connected to one end of the refrigeration branch liquid pipe in the first direction, and the other end of the refrigeration branch liquid pipe in the first direction is a closed end; and / or The main liquid pipe is connected at one end in the first direction to the heating branch liquid pipe at one end in the first direction, and the heating branch liquid pipe at the other end in the first direction is a closed end.

10. The refrigerant switching device as described in claim 8, characterized in that, The main liquid pipe, the refrigeration branch liquid pipe, and the heating branch liquid pipe are all located on the first horizontal plane.

11. The refrigerant switching device as described in claim 8, characterized in that, At least a portion of the branch fluid pipe and at least a portion of the bypass fluid pipe are arranged side by side.

12. The refrigerant switching device as described in claim 8, characterized in that, The main liquid pipe, the cooling branch liquid pipe, and the heating branch liquid pipe are spaced apart along the second direction. The bypass liquid pipe has a bend that bends upward past the heating branch liquid pipe to connect with the cooling branch liquid pipe.

13. The refrigerant switching device as described in claim 12, characterized in that, The curved portion is not higher than the second horizontal plane.

14. The refrigerant switching device as described in claim 8, characterized in that, The first main tube also includes a three-way tube, one end of which is connected to the first transition section, and the other two ends of which are respectively connected to the branch liquid tube and the bypass liquid tube; The tee pipe is located on the first horizontal plane.

15. The refrigerant switching device as described in claim 8, characterized in that, The portion of the first transition section located on the first horizontal plane connects the branch liquid pipe and the bypass liquid pipe, and the portion of the first transition section located on the first horizontal plane is arranged to meander along the second direction.

16. The refrigerant switching device as described in claim 8, characterized in that, A second filter tube is provided between the first transition section and the heat source side connection section.

17. The refrigerant switching device as described in claim 8, characterized in that, The branch liquid pipe, the bypass liquid pipe, and the second main pipe are located in different vertical planes.

18. The refrigerant switching device as described in claim 1, characterized in that, The second pipeline includes a load-side liquid pipe, the load-side liquid pipe and the liquid control valve are spaced apart, and the main body of the first pipeline and the main body of the second pipeline are located between the load-side liquid pipe and the liquid control valve; The load-side liquid pipe and the liquid control valve are above the second horizontal plane.

19. The refrigerant switching device as described in claim 1, characterized in that, The housing includes a housing body and a chassis. The chassis is disposed at the bottom of the housing body and is detachably connected to the housing body. The liquid pipe assembly is connected to the housing body and is spaced apart from the chassis.

20. The refrigerant switching device as described in claim 19, characterized in that, The housing also includes a liquid pipe crossbeam, which is connected to the heat source side connection and to the housing body.

21. The refrigerant switching device as described in any one of claims 1 to 20, characterized in that, It also includes a pressure relief assembly, which includes: The main pressure relief pipe extends in the first direction; Multiple pressure relief branch pipes are spaced apart along the first direction, and each pressure relief branch pipe extends along a second direction, with one end connected to the main pressure relief pipe and the other end connected to the second pipeline; and Pressure relief valve is installed in the main pressure relief pipe or the branch pressure relief pipe; Wherein, the first direction and the second direction are perpendicular to each other.

22. The refrigerant switching device as described in claim 21, characterized in that, The main body of the pressure relief main pipe is located on the first horizontal plane, and the main body of the pressure relief branch pipe is located on the second horizontal plane.

23. The refrigerant switching device as described in claim 22, characterized in that, The main body of the first pipeline branches into two liquid branches, which are defined as a branch liquid pipe and a bypass liquid pipe, respectively. The branch liquid pipe, the bypass liquid pipe and the pressure relief branch pipe are located in different vertical planes.

24. The refrigerant switching device as described in claim 22, characterized in that, The main body of the first pipeline branches into two liquid branches, which are defined as a branch liquid pipe and a bypass liquid pipe, respectively. The pressure relief branch pipe is located in the same vertical plane as either the branch liquid pipe or the bypass liquid pipe.

25. A heating, ventilation, and air conditioning system, characterized in that, include: Heat source unit; Load unit; and The refrigerant switching device as described in any one of claims 1 to 24, wherein the liquid pipe assembly and the gas pipe assembly of the refrigerant switching device are connected to the heat source unit and the load unit.

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