Refrigerant switching device and air conditioning system

Abstract

The present application discloses a refrigerant switching device and a heating, ventilation and air conditioning system. The refrigerant switching device provided in embodiments of the present application comprises a housing, and a liquid pipe assembly and a gas pipe assembly that are arranged separately. The liquid pipe assembly and the gas pipe assembly are mounted in the housing. In a disassembling and assembling direction in which one of the gas pipe assembly and the liquid pipe assembly approaches or moves away from the other, the gas pipe assembly and the liquid pipe assembly do not interfere with each other.

Description

Refrigerant switching device and air conditioning system

[0001] This application claims priority to Chinese Patent Application No. 2024108768357, filed on July 1, 2024, entitled "Refrigerant Switching Device and Air Conditioning System," and Chinese Patent Application No. 202421541769X, also entitled "Refrigerant Switching Device and Air Conditioning System," filed on June 28, 2024, and to Chinese Patent Application No. 2024108652331, entitled "Refrigerant Switching Device and HVAC System," and Chinese Patent Application No. 2024215211682, also entitled "Refrigerant Switching Device and HVAC System," filed on June 28, 2024. This application also claims priority to Chinese Patent Application No. 2024212418239, entitled "Refrigerant Switching Device and HVAC System Having the Thereof." All of the above are incorporated herein by reference. Technical Field

[0002] This application relates to the field of heating, ventilation and air conditioning technology, and in particular to a refrigerant switching device and an air conditioning system using the refrigerant switching device. Background Technology

[0003] 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.

[0004] In related technologies, refrigerant switching devices include liquid pipe assemblies and gas pipe assemblies. During production and assembly, all pipe assemblies must be welded first and then installed into the housing as a whole. Due to the large overall weight of the pipes, assembly is inconvenient and structural deformation is likely to occur, affecting product quality. Summary of the Invention

[0005] This application provides a refrigerant switching device and an air conditioning system, which can improve production efficiency and ensure product quality.

[0006] In a first aspect, embodiments of this application provide a refrigerant switching device, including:

[0007] shell; and

[0008] The piping structure includes a separately configured liquid pipe assembly and a gas pipe assembly, which are installed inside the housing. In the disassembly / reassembly direction, the gas pipe assembly and the liquid pipe assembly do not interfere with each other, with one of the gas pipe assembly and the other being closer to or further away from the other.

[0009] In the assembly process of the refrigerant switching device in this embodiment, the liquid pipe assembly and the gas pipe assembly can be installed sequentially on the housing. Furthermore, in the disassembly / reassembly direction where one of the gas pipe assembly is closer to or further away from the other, the gas pipe assembly and the liquid pipe assembly do not interfere with each other, making disassembly and assembly more convenient. This reduces installation difficulty, improves installation efficiency, and reduces the labor intensity of operators. Compared with the structure in related technologies where the liquid pipe assembly and the gas pipe assembly are connected as a single unit before installation, the liquid pipe assembly and the gas pipe assembly installed in this embodiment are lighter in weight, less prone to structural deformation, reduce installation problems, ensure product quality, and improve product yield.

[0010] In one embodiment, the liquid tubing assembly defines an installation space with an opening along the disassembly / assembly direction, and the main body of the gas tubing assembly is disposed within the installation space.

[0011] In one embodiment, in the disassembly / assembly direction, the main body portion of the air tube assembly and the main body portion of the liquid tube assembly are stacked.

[0012] In one embodiment, the liquid tubing assembly includes

[0013] Liquid control valves; and

[0014] The liquid pipeline includes a liquid pipe connector configured to connect to a heat source unit and a load-side liquid pipe configured to connect to a load unit. The liquid control valve is connected to the liquid pipeline to control the flow rate or opening and closing of the flow path of the liquid pipeline.

[0015] The liquid control valve and the load-side liquid pipe are disposed on opposite sides of the main body of the liquid pipeline, and the main body of the gas pipe assembly is located between the liquid control valve and the load-side liquid pipe, and is stacked with the main body of the liquid pipeline.

[0016] In one embodiment, the liquid tubing assembly includes:

[0017] 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.

[0018] A first conduit, connected to the heat source side connection, is closer to the heat source unit than the liquid control valve, and its main body is positioned on a first horizontal plane; and

[0019] The second pipeline is connected to the load-side connection part. The main body of the second pipeline is set on the second horizontal plane. The end of the second pipeline away from the load-side connection part is provided with a load-side liquid pipe.

[0020] The second horizontal plane is positioned above the first horizontal plane at intervals.

[0021] 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 and both are perpendicular to the disassembly / assembly direction.

[0022] In one embodiment, the load-side connection extends along the disassembly / assembly 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;

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In one embodiment, the second pipeline further includes a fourth transition section, wherein 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.

[0027] In one embodiment, the first filter tube is located on the side of the liquid manifold away from the liquid control valve.

[0028] 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.

[0029] In one embodiment, the number of liquid manifolds is three, namely a main liquid manifold, a cooling branch liquid manifold, and a heating branch liquid manifold. The main liquid manifold is configured to be connected to a heat source unit. The cooling branch liquid manifold and the heating branch liquid manifold are branched from the main liquid manifold. Two liquid branches are branched 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.

[0030] 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

[0031] 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.

[0032] 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;

[0033] And / or, at least a portion of the branch fluid pipe and at least a portion of the bypass fluid pipe are arranged side by side and located on the first horizontal plane.

[0034] 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.

[0035] In one embodiment, the curved portion is not higher than the second horizontal plane.

[0036] In one embodiment, the first main tube further includes a liquid tee pipe, 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 pipe and the bypass liquid pipe;

[0037] The liquid tee is located on the first horizontal plane.

[0038] 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.

[0039] In one embodiment, a second filter tube is provided between the first transition portion and the heat source side connection portion.

[0040] In one embodiment, the branch liquid pipe, the bypass liquid pipe, and the second main pipe are located in different vertical planes.

[0041] In one embodiment, the load-side liquid pipe and the liquid control valve are spaced apart, with the main body of the first pipe and the main body of the second pipe located between the load-side liquid pipe and the liquid control valve; the load-side liquid pipe and the liquid control valve are higher than the second horizontal plane.

[0042] In one embodiment, the tracheal assembly includes:

[0043] A gas manifold extends along the first direction;

[0044] Gas branch pipes are arranged at intervals along the first direction, and multiple gas branch pipes converge into a gas manifold, wherein the gas manifold is closer to the heat source unit than each individual gas branch pipe; and

[0045] A gas control valve is connected to the gas branch pipe such that each gas branch pipe is provided with at least one gas control valve, and a plurality of gas control valves are configured in at least one row along the first direction;

[0046] The gas manifold and one row of gas control valves are disposed at both ends of the gas branch pipe along the second direction, and the gas manifold and the gas control valves are located between the liquid control valve and the load-side liquid pipe.

[0047] In one embodiment, the gas branch pipe further includes a load-side gas pipe configured to communicate with the load unit, the load-side gas pipe being located on the side of the gas manifold away from the gas control valve;

[0048] Multiple load-side air pipes are spaced apart along the first direction and are vertically offset from the load-side liquid pipes in the assembly / disassembly direction.

[0049] In one embodiment, the second pipeline includes a first filter tube located on the first horizontal plane, and the gas manifold is located above the first filter tube.

[0050] In one embodiment, the gas branch pipe further includes a third filter pipe, a fifth transition section, and a sixth transition section. The third filter pipe is located on the first horizontal plane and is arranged side by side with the first filter pipe. The fifth transition section extends downward to the first horizontal plane and connects to the third filter pipe. The sixth transition section extends upward from the third filter pipe and connects to the load-side gas pipe.

[0051] In one embodiment, the gas manifold includes a high-pressure gas pipe and a low-pressure gas pipe, and branches from the gas branch pipe to form two gas branches, which are respectively defined as a bypass gas pipe and a branch gas pipe. The bypass gas pipe is connected to the low-pressure gas pipe, and the branch gas pipe is connected to the high-pressure gas pipe. At least one gas control valve is provided on the bypass gas pipe and the branch gas pipe respectively.

[0052] The high-pressure air pipe and the low-pressure air pipe are stacked at intervals in the disassembly and assembly direction.

[0053] In one embodiment, the main liquid line includes an upwardly extending liquid outlet located on the side of the gas manifold away from the liquid control valve.

[0054] In one embodiment, the gas manifold is provided with a gas pipe connection portion that extends through the housing to at least one side along the first direction, and the liquid pipe outlet is provided with a liquid pipe connection portion that extends through the housing to at least one side along the first direction.

[0055] The gas pipe connection and the liquid pipe connection are located on the same side of the housing and are arranged at intervals along the disassembly and assembly direction, and the gas pipe connection and the liquid pipe connection are staggered.

[0056] In one embodiment, a pressure relief assembly is further included, the pressure relief assembly comprising:

[0057] A pressure relief manifold extends along the first direction;

[0058] Multiple pressure relief branch pipes are spaced apart along the first direction, and each pressure relief branch pipe extends along the second direction, with one end connected to the main pressure relief pipe and the other end connected to the second pipeline; and

[0059] A pressure relief valve is installed in the main pressure relief pipe or the branch pressure relief pipe.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] In one embodiment, the refrigerant switching device has a first direction and a second direction, the first direction and the second direction being perpendicular to each other;

[0064] The refrigerant switching device includes:

[0065] Multiple gas manifolds are provided, the gas manifolds extending along the first direction, the multiple gas manifolds are spaced apart and include a first gas manifold and a second gas manifold, the pressure in the first gas manifold and the pressure in the second gas manifold are different;

[0066] Multiple first branch gas pipes are connected to the first gas manifold, and each first branch gas pipe is equipped with a first gas valve.

[0067] Multiple second branch gas pipes are connected to the second gas manifold, and the second branch gas pipes are equipped with second gas valves;

[0068] Multiple manifolds, including a first branch gas pipe and a second branch gas pipe, converge into a manifold, which is configured to connect to a load unit and is equipped with a third gas valve.

[0069] The first gas valve, the second gas valve, and the third gas valve are located on the same side of the first gas manifold and the second gas manifold in the second direction.

[0070] In one embodiment, the first direction, the second direction, the third direction, and the disassembly / assembly direction are perpendicular to each other.

[0071] Viewed along the disassembly / assembly direction, two of the first, second, and third air valves are located on the first vertical plane, and the remaining air valve is located on the second vertical plane. The first and second vertical planes are perpendicular to the first direction and are spaced apart along the first direction.

[0072] In one embodiment, it further includes:

[0073] A gas tee, wherein the first gas valve, the second gas valve, and the third gas valve are all connected to a gas tee;

[0074] The first air valve is located on the first vertical plane, and the second air valve and the third air valve are located on the second vertical plane;

[0075] In the second direction, the second gas valve is farther away from the first gas manifold and the second gas manifold than the third gas valve, and the first gas valve is farther away from the first gas manifold and the second gas manifold than the third gas valve;

[0076] The gas tee spans the first vertical plane and the second vertical plane.

[0077] In one embodiment, each of the first, second, and third air valves includes a first connecting portion and a second connecting portion, the first connecting portion extending in the second direction and the second connecting portion extending in the disassembly / assembly direction;

[0078] The first branch gas pipe extends along the second direction and connects the first gas manifold and the first gas valve at the first connection point.

[0079] The second branch gas pipe extends along the second direction and connects the second gas manifold and the second gas valve at the second connection point;

[0080] The gas tee includes a first pipe, a second pipe, and a third pipe that are interconnected. The first pipe, the second pipe, and the third pipe converge at the first vertical plane. The first pipe extends along the disassembly / assembly direction and connects to the second connection portion of the first gas valve. The second pipe extends along the second direction and from the first vertical plane to the second vertical plane, and connects to the first connection portion of the second gas valve at the second vertical plane. The third pipe extends along the second direction and from the first vertical plane to the second vertical plane, and connects to the first connection portion of the third gas valve at the second vertical plane.

[0081] The manifold is located on the second vertical plane and connects to the second connection part of the third air valve.

[0082] In one embodiment, the first gas manifold and the second gas manifold are located on a third vertical plane, which is perpendicular to the first vertical plane and the second vertical plane.

[0083] In one embodiment, on a plane perpendicular to the second direction, at least two of the orthographic projections of the first air valve, the second air valve, and the third air valve have overlapping regions.

[0084] In one embodiment, the refrigerant switching device further has a disassembly / assembly direction, wherein the first direction, the second direction, and the disassembly / assembly direction are perpendicular to each other;

[0085] The axes of the first air valve, the second air valve, and the third air valve extend along the disassembly / assembly direction.

[0086] The first air valve, the second air valve, and the third air valve are located at the same horizontal height and on a third horizontal plane, which is perpendicular to the disassembly / assembly direction.

[0087] In one embodiment, the axis of the first air valve is located in a first vertical plane, and the axes of the second air valve and the third air valve are located in a second vertical plane. The first vertical plane and the second vertical plane are parallel to each other and perpendicular to the first direction.

[0088] In one embodiment, it further includes:

[0089] The gas tee is connected to the first gas valve, the second gas valve, and the third gas valve, respectively.

[0090] In one embodiment, in the second direction, the first air valve is located between the second air valve and the third air valve.

[0091] In one embodiment, when viewed along the disassembly / assembly direction, there is a first distance between the axis of the first air valve and the axis of the second air valve in the second direction, and a second distance between the axis of the first air valve and the axis of the third air valve in the second direction, wherein the first distance is equal to the second distance.

[0092] In one embodiment, the gas tee includes;

[0093] The first connecting section is connected to the second air valve and is located on the second vertical plane;

[0094] The second connecting section is connected to the first air valve and is located on the first vertical plane;

[0095] The third connecting section is connected to the third air valve and is located on the second vertical plane;

[0096] A first transition section connects the first connecting section and the second connecting section; and

[0097] The second transition section connects the second connecting section and the third connecting section.

[0098] In one embodiment, the second connecting section is provided with an interface, which is connected to the first air valve;

[0099] Wherein, the central axis of the first transition section and the central axis of the second transition section are located on the inclined surface, and the angle between the central axis of the interface and the inclined surface is not less than 20° and not greater than 30°.

[0100] In one embodiment, the central axis of the first gas manifold is located on a fourth horizontal plane, the central axis of the second gas manifold is located on a fifth horizontal plane, and the third, fourth, and fifth horizontal planes are arranged in parallel and spaced apart.

[0101] The first branch trachea is located at the fourth horizontal plane, and the second branch trachea is located at the fifth horizontal plane;

[0102] The fourth horizontal plane and the fifth horizontal plane are located on the same side of the third horizontal plane.

[0103] In one embodiment, the first connecting segment and the third connecting segment are located on the fourth horizontal plane;

[0104] The second connecting segment is located on the fifth horizontal plane.

[0105] In one embodiment, the third gas valve is closer to the second gas manifold than the second gas valve;

[0106] The second branch trachea includes:

[0107] The first extension section is connected to the second air valve and is located on the second vertical plane;

[0108] The second extension segment has one end connected to the first extension segment;

[0109] The third extension section is connected to the second gas manifold and is located on the first vertical plane; the third extension section is connected to the other end of the second extension section.

[0110] The first extension section and the third air valve are spaced apart in the second direction.

[0111] In one embodiment, the central axis of the first gas manifold is located on a fourth horizontal plane, the central axis of the second gas manifold is located on a fifth horizontal plane, and the third, fourth, and fifth horizontal planes are arranged in parallel and spaced apart.

[0112] The fourth horizontal plane is located between the third horizontal plane and the fifth horizontal plane.

[0113] In one embodiment, the manifold further includes:

[0114] A first air outlet, one end of which is connected to the third air valve and extends away from the second air valve;

[0115] A filter, one end of which is connected to the other end of the first gas outlet and located below the gas manifold;

[0116] The second air outlet is connected to the other end of the filter and extends away from the second air valve.

[0117] In one embodiment, the central axis of the first air outlet, the central axis of the filter, and the central axis of the second air outlet are located in the second vertical plane.

[0118] In one embodiment, the inner diameter of the filter is larger than the inner diameter of the first air outlet; and / or

[0119] The inner diameter of the filter is larger than the inner diameter of the second air outlet.

[0120] In one embodiment, the central axis of the first gas manifold and the central axis of the second gas manifold are located in a third vertical plane, which is perpendicular to the second direction.

[0121] In one embodiment, it further includes:

[0122] The side plate of the housing is provided with a through port. The first gas valve, the second gas valve, the third gas valve, the first branch gas pipe, the second branch gas pipe and the gas manifold are located inside the housing. The gas manifold passes through the through port and extends out of the housing.

[0123] In one embodiment, the housing is provided with a gas pipe crossbeam, a vibration damping pad, and a crimping part. The gas pipe crossbeam is located below the end of the gas tee pipe that is connected to the second gas valve and is configured to support the gas tee pipe. The vibration damping pad is located between the gas tee pipe and the gas pipe crossbeam. The crimping part is connected to the gas pipe crossbeam and is pressed on top of the gas tee pipe.

[0124] In one embodiment, the first gas manifold and the second gas manifold are respectively connected to a fixing member located inside the housing to fix the relative positions of the first gas manifold and the second gas manifold.

[0125] 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.

[0126] In one embodiment, the housing further includes:

[0127] A support beam is provided, which is connected to the shell body to accommodate the liquid pipe assembly and the gas pipe assembly. The chassis is detachably connected to the shell body.

[0128] In one embodiment, the shell body includes a top plate and a plurality of side plates surrounding the periphery of the top plate, the plurality of side plates defining a downwardly facing opening, and the chassis sealing the opening;

[0129] The two ends of the supporting beam are respectively connected to the two oppositely arranged side plates.

[0130] In one embodiment, the support beam includes liquid pipe beams and gas pipe beams that are spaced apart along a second direction and extend along a first direction, wherein the first direction is perpendicular to the second direction;

[0131] The liquid tube crossbeam is configured to support the liquid tube assembly, and the gas tube crossbeam is configured to support the gas tube assembly.

[0132] In one embodiment, the main body of the gas pipe assembly is suspended on the main body of the liquid pipe assembly, and the portion of the liquid pipe assembly located within the housing is suspended on the chassis. The refrigerant switching device further includes:

[0133] A buffer element is provided between the liquid tubing assembly and the chassis.

[0134] In one embodiment, the cushioning element is a sponge or rubber component; and / or,

[0135] The buffer is provided with a contoured groove, and at least a portion of the liquid tube assembly is located within the contoured groove.

[0136] In one embodiment, the liquid pipe assembly and the gas pipe assembly are provided with at least one filter pipe and at least one one-way valve, wherein at least one of the filter pipes and at least one of the one-way valves are located on the horizontal plane of the liquid pipe assembly and the gas pipe near the chassis.

[0137] Secondly, embodiments of this application propose a heating, ventilation, and air conditioning system, comprising:

[0138] Heat source unit;

[0139] Load unit; and

[0140] 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. Attached Figure Description

[0141] 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.

[0142] Figure 1 is a structural schematic diagram of an embodiment of the HVAC system of this application;

[0143] Figure 2 is an overall schematic diagram of an embodiment of the refrigerant switching device of this application;

[0144] Figure 3 is a side view of the refrigerant switching device in Figure 2;

[0145] Figure 4 is a schematic diagram of the internal structure of the refrigerant switching device in Figure 3;

[0146] Figure 5 is a structural schematic diagram of an embodiment of the liquid tube assembly and gas tube assembly of this application;

[0147] Figure 6 is a schematic diagram of the explosion of the liquid pipe assembly and the gas pipe assembly in Figure 5;

[0148] Figure 7 is a side view of the explosion of the liquid pipe assembly and the gas pipe assembly in Figure 6;

[0149] Figure 8 is a side view of an embodiment of the liquid pipe assembly of this application;

[0150] Figure 9 is a partial structural schematic diagram of an embodiment of the liquid pipe assembly of this application;

[0151] Figure 10 is a structural schematic diagram of an embodiment of the endotracheal tube assembly and liquid tube assembly of this application;

[0152] Figure 11 is a structural schematic diagram of another embodiment of the liquid pipe assembly of this application;

[0153] Figure 12 is a structural schematic diagram of a portion of the liquid pipe assembly and pressure relief assembly of this application;

[0154] Figure 13 is a structural schematic diagram of an embodiment of the tracheal assembly of this application;

[0155] Figure 14 is a side view of an embodiment of the tracheal assembly of this application;

[0156] Figure 15 is a schematic diagram of the structure of an embodiment of the refrigerant switching device according to this application;

[0157] Figure 16 is a schematic diagram of another embodiment of the refrigerant switching device according to this application;

[0158] Figure 17 is a schematic diagram of another embodiment of the refrigerant switching device according to this application;

[0159] Figure 18 is one of the structural schematic diagrams of the gas tee according to an embodiment of this application;

[0160] Figure 19 is a second schematic diagram of the structure of the gas tee according to an embodiment of this application;

[0161] Figure 20 is a third schematic diagram of the structure of the gas tee pipe according to an embodiment of this application;

[0162] Figure 21 is a schematic diagram of the assembly of a portion of the refrigerant switching device according to an embodiment of this application;

[0163] Figure 22 is a schematic diagram of another embodiment of the refrigerant switching device according to this application;

[0164] Figure 23 is a structural schematic diagram of another embodiment of the refrigerant switching device according to this application;

[0165] Figure 24 is a structural schematic diagram of another embodiment of the refrigerant switching device according to this application;

[0166] Figure 25 is a schematic diagram of the cooperation between the gas valve and the gas tee of the refrigerant switching device according to an embodiment of this application;

[0167] Figure 26 is a structural perspective view of the refrigerant switching device according to an embodiment of this application;

[0168] Figure 27 is a schematic diagram of the exploded structure of the refrigerant switching device in Figure 2;

[0169] Figure 28 is an exploded structural diagram of the chassis of an embodiment of the refrigerant switching device in this application;

[0170] Figure 29 is a schematic diagram of the internal structure of the refrigerant switching device in Figure 3 at another cross-section;

[0171] Figure 30 is a schematic diagram of an embodiment of the refrigerant switching device of this application with a buffer component;

[0172] Figure 31 is a schematic diagram of another embodiment of the refrigerant switching device of this application with a buffer component;

[0173] Figure 32 is a schematic diagram of the installation structure of the overcooling component in one embodiment of the refrigerant switching device of this application;

[0174] Figure 33 is a structural schematic diagram of an embodiment of the supercooling component of this application;

[0175] Figure 34 is a diagram of the refrigerant flow direction in the refrigerant switching device provided in the embodiment of this application when all load units are in cooling mode;

[0176] Figure 35 is a diagram of the refrigerant flow direction in the refrigerant switching device provided in the embodiment of this application when all load units are in heating mode;

[0177] Figure 36 is a diagram of the refrigerant flow in the refrigerant switching device provided in the embodiment of this application when all load units are in the main cooling mode;

[0178] Figure 37 is a diagram showing the refrigerant flow direction in the refrigerant switching device provided in the embodiment of this application when all load units are in the main heating mode.

[0179] Reference numerals in the attached diagrams: 100, refrigerant switching device; 10, housing; 11, housing body; 111, top plate; 112, side plate; 1121, load-side side plate; 112a, 1122 Load-side port; 112b Heat source-side plate; 1123 Electrical control-side plate; 12 Chassis; 13 Support beam; 131 Liquid pipe beam; 132 Gas pipe beam; 16 Buffer; 20 Liquid pipe assembly; 20a Installation space; 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; 2211 Liquid pipe outlet; 2212 Liquid pipe connection; 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. Second pipe; 231. Second main pipe; 2311. Clearance 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; 30a. Gas manifold; 31. Low-pressure gas pipe; 311. Low-pressure gas pipe connection; 32. High-pressure gas pipe; 321. High-pressure gas pipe connection; 33. Bypass gas pipe; 34. Branch gas pipe; 35. Gas branch pipe; 351. Gas control valve; 352. Load-side gas pipe; 36. Third filter pipe; 37. Fifth transition section 38. Sixth Transition Section; 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 Connector; 56. T-Connector Connector; 61. First Gas Manifold; 611. First Branch Gas Pipe; 62. Second Gas Manifold; 621. Second Branch Gas Pipe; 622. First Extension Section; 623. Second Extension Section; 624. Third Extension Section; 63. First Gas Valve; 64. Second Gas Valve; 65. Third Gas Valve; 651. First Connection Section; 652. Second Connection Section; 66. Gas T-joint; 661, First connecting section; 662, First transition section; 663, Second connecting section; 664, Interface; 665, Second transition section; 666, Third connecting section; 67, Manifold; 671, First air outlet; 672, Second air outlet; 673, Filter; 68, Vibration damping pad; 69, Support rod; 70, Fixing component; 80, Crimping part; 200, Load unit; 300, Heat source unit; 400, HVAC system; First horizontal plane H1; Second horizontal plane H2; Third horizontal plane H3; Fourth horizontal plane H4; Fifth horizontal plane H5; First vertical plane V1; Second vertical plane V2; Third vertical plane V3; Inclined plane M.

[0180] 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

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] In related technologies, refrigerant switching devices include liquid pipe assemblies and gas pipe assemblies. During production and assembly, all pipe assemblies must be welded first and then installed into the housing as a whole. Due to the large overall weight of the pipes, assembly is inconvenient and structural deformation is likely to occur, affecting product quality.

[0187] To address the aforementioned issues, this application proposes a refrigerant switching device. The refrigerant switching device is located on the refrigerant circuit between the heat source unit and the load unit. The heat source unit can be installed in an outdoor space or an indoor space (such as an equipment room), and 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. Here, no specific restrictions are placed on the installation environment of the refrigerant switching device.

[0188] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0189] Referring to Figures 1 to 6, 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.

[0190] For ease of description, the refrigerant switching device 100 has a first direction (indicated by arrow A in the figure) and a second direction (indicated by arrow B in the figure), which are perpendicular to each other.

[0191] The outer contour of the housing 10 can be arranged in a rectangular block shape, with perpendicular height, width, and length directions. The housing 10 is used to support components such as the liquid pipe assembly 20 and the gas pipe assembly 30. The housing 10 can be made of alloys or metals such as aluminum or steel to meet requirements for 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 limitations on this. The housing 10 provides protection and is compatible with the connection structure of the installation environment.

[0192] At least a portion of the gas pipe assembly 30 is disposed within the internal space of the housing 10, meaning that the gas pipe 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 gas pipe assembly 30 is used to form a gas path connection between the heat source unit and the load unit. At least a portion of the liquid pipe assembly 20 is disposed within the internal space of the housing 10, meaning that the liquid pipe 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 pipe assembly 20 is used to form a liquid path connection between the heat source unit and the load unit. Understandably, through the gas and liquid flow between the heat source unit, the load unit, and the refrigerant switching device 100, the HVAC system can achieve multiple functions such as heating and cooling, wherein the refrigerant switching device 100 controls or selectively controls the on / off state of the gas path assembly and the liquid path assembly to regulate the above functions.

[0193] In this embodiment, the gas pipe assembly 30 and the liquid pipe assembly 20 are separate components. This separate configuration means that the gas pipe assembly 30 and the liquid pipe assembly 20 are constructed separately and manufactured independently as two components. Before installation, the gas pipe assembly 30 and the liquid pipe assembly 20 are not fixedly connected by welding, snap-fit, or other means. Therefore, during the assembly of the refrigerant switching device 100, the gas pipe assembly 30 and the liquid pipe assembly 20 can be sequentially installed on the housing 10. Specifically, the liquid pipe assembly 20 can be installed first, followed by the gas pipe assembly 30, or vice versa; this embodiment does not limit the specific installation.

[0194] Furthermore, in the disassembly / removal direction of the endotracheal assembly 30 and the liquid tubing assembly 20 relative to the other, the endotracheal assembly 30 and the liquid tubing assembly 20 do not interfere with each other. For example, the disassembly / removal direction is the height direction of the housing 10, and the liquid tubing assembly 20 and the endotracheal assembly 30 are sequentially installed within the housing 10 along this direction. Taking the liquid assembly as an example, a portion of the housing 10 is formed with an opening facing upwards along the height direction. After the liquid assembly is installed in the housing 10, the endotracheal assembly 30 is assembled from top to bottom, approaching the liquid tubing assembly 20. During disassembly, the endotracheal assembly 30 is first moved away from the liquid tubing assembly 20 from bottom to top. It should be noted that, to ensure smooth disassembly and assembly along the disassembly and assembly direction, the air tube assembly 30 and the liquid tube assembly 20 do not have any structures that obstruct each other in the disassembly and assembly direction. For example, on the path where the air tube assembly 30 approaches or moves away from the liquid tube assembly 20, the liquid tube assembly 20 does not have any structures that obstruct the air tube assembly 30, thus ensuring that the approach and movement of the liquid tube assembly 20 and the air tube assembly 30 towards each other along the disassembly and assembly direction are not interfered with. Of course, the liquid tube assembly 20 and the air tube assembly 30 can also be disassembled and assembled along the width or length direction of the housing 10, that is, the disassembly and assembly direction is the width or length direction of the housing 10, and this embodiment of the application does not limit this.

[0195] For ease of description, the refrigerant switching device 100 has a third direction (indicated by arrow C in the figure), which can be the direction of disassembly and assembly.

[0196] Therefore, during the assembly process of the refrigerant switching device 100 in this embodiment, the liquid pipe assembly 20 and the gas pipe assembly 30 can be sequentially installed on the housing 10. Furthermore, in the disassembly / reassembly direction where one of the gas pipe assembly 30 is closer to or further away from the other, the gas pipe assembly 30 and the liquid pipe assembly 20 do not interfere with each other, making disassembly and assembly more convenient. This reduces installation difficulty, improves installation efficiency, and reduces the labor intensity of operators. Compared with the related technology where the liquid pipe assembly 20 and the gas pipe assembly 30 are connected as a single unit before installation, the liquid pipe assembly 20 and the gas pipe assembly 30 installed in this embodiment are lighter, less prone to structural deformation, reduce installation problems, ensure product quality, and improve product yield.

[0197] Referring to Figures 5 to 7, in some embodiments, the liquid tubing assembly 20 defines an installation space 20a with an opening along the disassembly / assembly direction, and the main body of the air tubing assembly 30 is disposed within the installation space 20a. As shown in Figure 6, in this embodiment, the two ends of the liquid tubing assembly 20 are higher than the middle portion, forming a recessed groove-like space, and the main body of the air tubing assembly 30 is located within this installation space 20a. Thus, the structures of the liquid tubing assembly 20 and the air tubing assembly 30 are more compact, and the space utilization rate is high.

[0198] In one embodiment, the main body of the endotracheal tube assembly 30 and the main body of the liquid tubing assembly 20 are stacked together along the disassembly / assembly direction. Optionally, the main body of the endotracheal tube assembly 30 is positioned above the main body of the liquid tubing assembly 20, allowing the endotracheal tube assembly 30 to move up and down along the disassembly / assembly direction to move closer to or further away from the liquid tubing assembly 20. Thus, by stacking the main body of the endotracheal tube assembly 30 and the main body of the liquid tubing assembly 20, while ensuring that the main bodies of the endotracheal tube assembly 30 and the liquid tubing assembly 20 do not interfere with each other in the disassembly / assembly direction, the disassembly / assembly of the endotracheal tube assembly 30 and the liquid tubing assembly 20 is made more convenient, thereby improving disassembly / assembly efficiency.

[0199] It is understandable that the tracheal tube assembly 30 may form the installation space 20a, and the liquid tube assembly 20 may be disposed within the installation space 20a; or the tracheal tube assembly 30 and the liquid tube assembly 20 may not form the installation space 20a, and the two may be stacked along the disassembly and assembly direction. The embodiments of this application do not limit this.

[0200] The following explanation will continue with the example of installing the liquid tubing assembly 20 first and then the gas tubing assembly 30, with the installation and removal direction being the height direction of the housing 10.

[0201] As shown in Figures 7 to 9, in one embodiment, the liquid pipe assembly 20 includes a liquid control valve 21 and a liquid pipe. The liquid pipe includes a liquid pipe connector for connecting to a heat source unit and a load-side liquid pipe 232 for connecting to a load unit. The liquid control valve 21 is connected to the liquid pipe to control the flow rate or opening and closing of the liquid pipe. The liquid control valve 21 may be an electromagnetic expansion valve.

[0202] The liquid control valve 21 and the load-side liquid pipe 232 are positioned on opposite sides of the main body of the liquid pipeline, for example, on opposite sides of the main body of the liquid pipeline along the length of the housing 10. Optionally, the liquid control valve 21 and the load-side liquid pipe 232 are higher than the main body of the liquid pipeline in the height direction of the housing 10. Thus, the liquid control valve 21, the load-side liquid pipe 232, and the main body of the liquid pipeline form the aforementioned installation space 20a. The installation space 20a has an upper opening along the height direction of the housing 10, and the air hose assembly 30 is placed inside the installation space 20a from top to bottom. The main body of the air hose assembly 30 is located between the liquid control valve 21 and the load-side liquid pipe 232, and is stacked with the main body of the liquid pipeline. In this way, the main body of the air hose assembly 30 is surrounded by the liquid hose assembly 20, resulting in a more compact structure and improved space utilization.

[0203] In one embodiment, the liquid control valve 21 includes a heat source-side connection portion 212 and a load-side connection portion 211, and the liquid pipeline includes a first pipeline 22 and a second pipeline 23. The first pipeline 22 is connected to the heat source-side connection portion 212 and is closer to the heat source unit than the liquid control valve 21. The main body of the first pipeline 22 is disposed on a first horizontal plane. The second pipeline 23 is connected to the load-side connection portion 211 and is disposed on a second horizontal plane. A load-side liquid pipe 232 is provided at one end of the second pipeline 23 away from the load-side connection portion 211. The second horizontal plane is spaced above the first horizontal plane, and the main body of the gas pipe assembly 30 is disposed on the main body of the second pipeline 23.

[0204] 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.

[0205] 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 complex structural considerations 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 and a second horizontal plane. 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 minimizing its space requirements. Consequently, when the gas pipe assembly 30 is mounted on the liquid pipe assembly 20, the overall structure of both is thinner, facilitating the miniaturization of both the gas pipe assembly 30 and the liquid pipe assembly 20.

[0206] It should be noted that, in the embodiments of this application, "the pipeline portion located on the horizontal plane" means that the central axis of the pipeline is 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.

[0207] Referring to Figures 8 and 9, in some embodiments, the first pipeline 22 includes at least one liquid manifold 22a and multiple 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, with one end of each liquid branch pipe 22b connected to a heat source side connection 212 in the second direction and the other end connected to the liquid manifold 22a. The first direction is parallel to a first horizontal plane, and the first and second directions are perpendicular to each other. Optionally, the first direction is the length direction of the housing 10, and the second direction is the width direction of the housing 10. By arranging the liquid manifold 22a to connect multiple 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 needs of low-cost production. Furthermore, the liquid manifold 22a and the liquid branch pipe 22b extend along a first direction and a second direction that are perpendicular to each other, respectively, which makes the structure of the liquid pipe assembly 20 clearer and more compact.

[0208] 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.

[0209] In another structural implementation of the liquid pipe assembly 20, there are three liquid manifolds 22a, namely 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.

[0210] 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.

[0211] Referring to Figure 8, in one embodiment, the load-side connection 211 extends along a vertical direction, which is perpendicular to the first and second directions, and can be selected as the mounting direction of the housing 10. The load-side connection 211 is spaced apart above the first horizontal plane, 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 within a vertical plane perpendicular to the first direction, thereby reducing space occupation and making the liquid pipe assembly 20 more compact.

[0212] 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 and is the main body of the liquid branch pipe 22b, branching 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, and the second transition section 233 extends upward from the second main pipe 231 to the load side connection section 211.

[0213] Referring to Figures 8 and 9, in one embodiment, branch liquid pipes 225 and bypass liquid pipes 226 are formed from each first main pipe branch. 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 control valve 21 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 control valve 21 and the branch liquid pipe 225 to the heating branch liquid pipe 223.

[0214] 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.

[0215] 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. 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, resulting in a simpler and more compact structure and reducing the space occupied in the vertical direction.

[0216] Referring to Figure 9, 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 pipeline 22 simpler and more compact. Specifically, 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 further located on the side of the cooling branch liquid pipe 222 away from the heating branch liquid pipe 223.

[0217] As shown in Figure 9, 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.

[0218] Furthermore, the curved section is not higher than the second horizontal plane H2. That is, the top of the curved section 227 can be located at the second horizontal plane H2, or the top of the curved section 227 can be located between the first horizontal plane H1 and the second horizontal plane H2. By ensuring that the curved section is not higher than the second horizontal plane H2, the space occupied by the first pipe 22 in the vertical direction can be reduced.

[0219] Referring to Figure 9, in one embodiment, the first main tube further includes a liquid tee pipe located on the first horizontal plane H1. One end of the liquid tee pipe is connected to the first transition portion 224, and the other two ends of the liquid tee pipe are respectively connected to the branch liquid pipe 225 and the bypass liquid pipe. The liquid tee pipe can be an integral structure, which is convenient for manufacturing. The branch liquid pipe 225, the bypass liquid pipe, and the first transition portion 224 are connected by the liquid tee pipe, which is a simple and effective structure.

[0220] In one embodiment, the portion of the first transition section 224 located on the first horizontal plane H1 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 H1 is arranged in a detour 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 H1 is connected to one end of the liquid 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 H1 is U-shaped, so that the portion of the first transition section 224 located on the first horizontal plane H1 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 in a detour, extending the structural life and improving the structural reliability.

[0221] 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.

[0222] 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 Figure 9, 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. This not only effectively avoids interference between the branch liquid pipe 225, the bypass liquid pipe 226, and the second main body pipe 231, but also allows any one of the branch liquid pipe 225, the bypass liquid pipe 226, and the second main body pipe 231 to be observed when the bottom of the housing 10 is removed, facilitating maintenance and other operations.

[0223] Referring to Figure 9, in one embodiment, the end of the second pipe 23 furthest from the liquid control valve 21 is used to connect to the load unit. At the end of the second pipe 23 closest to the load unit, the second pipe 23 also includes a first filter pipe 24 and a third transition section 234. The first filter pipe 24 removes mechanical impurities and dirt from the pipe, ensuring smooth refrigerant flow and preventing blockages from affecting the normal operation of the HVAC system. The first filter pipe 24 is located on a first horizontal plane, and the third transition section 234 extends downwards from the second main pipe 231 to the first horizontal plane and connects to the first filter pipe 24. Referring to Figures 1 and 2, positioning the first filter pipe 24 downwards on the first horizontal plane creates a height difference between it and the second horizontal plane. This provides space for some of the gas pipe components 30 on the first filter pipe 24, facilitating disassembly and assembly and avoiding interference. Furthermore, the first horizontal plane is closer to the bottom of the housing 10, allowing for convenient maintenance of the first filter pipe 24 by removing the bottom casing of the housing 10, thus improving work efficiency.

[0224] 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. 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.

[0225] 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.

[0226] 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, 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.

[0227] As shown in Figure 7, 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 H2. 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 H2 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.

[0228] Referring to Figures 10 to 12, 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] Referring to Figure 12, optionally, the pressure relief valve 42 is installed on the pressure relief manifold 41. Since installing the pressure relief valve 42 only on the pressure relief manifold 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, thereby reducing the size requirement of the refrigerant switching device 100 and adapting it to various installation environments.

[0233] 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.

[0234] In one embodiment, the main pressure relief pipe 41 is located on the first horizontal plane H1, and the branch pressure relief pipe 43 is located on the second horizontal plane H2, 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 H1 and the branch pressure relief pipe 43 on the second horizontal plane H2 helps to make the pressure relief assembly 40 and the liquid pipe assembly 20 more compact as a whole, reducing space occupation.

[0235] 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.

[0236] Alternatively, referring to Figure 12, 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, the pressure relief branch pipe 43 and the branch liquid pipe 225 are located on the same vertical plane, thereby reducing the size of the pressure relief assembly 40 and the liquid pipe assembly 20 in the first direction and reducing the space occupied.

[0237] Referring to Figures 13 and 14, in some embodiments, the gas pipe assembly 30 includes a gas manifold 30a, a plurality of gas branches 35, and a gas control valve 351. The gas manifold 30a extends along a first direction, and the plurality of gas branches 35 are arranged at intervals along the first direction and converge at the gas manifold 30a. The gas manifold 30a is closer to the connected heat source unit than each gas branch 35. By merging multiple parallel gas branches 35 into the gas manifold 30a, the pipe length of each gas branch 35 is reduced, thereby effectively reducing costs. The gas control valve 351 is connected to the gas branches 35 and is used to control the on / off state of the gas passage within the gas branches 35. Each gas branch 35 is provided with at least one gas control valve 351, and the plurality of gas control valves 351 on the plurality of gas branches 35 are configured in at least one row arranged along the first direction. As shown in Figure 13, exemplarily, each gas branch pipe 35 is provided with three gas control valves 351. The gas control valves 351 are configured in three rows arranged side-by-side along a second direction, with each row of gas control valves 351 spaced apart along a first direction. In this embodiment, the gas manifold 30a and one row of gas control valves 351 are located at both ends of the gas branch pipe 35 along the second direction. Thus, the gas manifold 30a, gas branch pipes 35, and gas control valves 351 constitute the main body of the gas pipe assembly 30. The gas manifold 30a and gas control valves 351 are located between the liquid control valve 21 and the load-side liquid pipe 232, facilitating the piping arrangement of the gas pipe assembly 30 and making the gas pipe assembly 30 compact and easy to manufacture and assemble.

[0238] Optionally, the gas manifold 30a is located above the first filter tube 24. In conjunction with the foregoing, the first filter tube 24 is located on a first horizontal plane, and the third transition portion 234, the first filter tube 24, and the fourth transition portion 235 form a concave avoidance corner, thereby avoiding the gas manifold 30a. The gas manifold 30a is located above the first filter tube 24, and there is sufficient distance between the gas manifold 30a and the third transition portion 234, the first filter tube 24, and the fourth transition portion 235. This not only avoids interference between the gas pipe assembly 30 and the liquid pipe assembly 20, but also facilitates installation and maintenance / replacement of the first filter tube 24, improving work efficiency.

[0239] The gas branch pipe 35 includes a load-side gas pipe 352 for connecting to the load unit. The load-side gas pipe 352 is located on the side of the gas manifold 30a away from the gas control valve 351 to facilitate the bending arrangement of the load-side gas pipe 352. Referring to Figures 5 and 6, in some embodiments, the multiple load-side gas pipes 352 of the multiple gas branch pipes 35 are spaced apart along a first direction and are vertically offset from the load-side liquid pipes 232 in the disassembly / assembly direction. For example, in the disassembly / assembly direction, the multiple load-side liquid pipes 232 are located above the multiple load-side gas pipes 352, or the multiple load-side gas pipes 352 may be located above the multiple load-side liquid pipes 232. In summary, there is sufficient spacing between the load-side liquid pipes 232 and the load-side gas pipes 352 to avoid interference between them and to provide operating space for connecting the load-side liquid pipes 232 and the load-side gas pipes 352 to the indoor unit, thus providing operational convenience.

[0240] In one specific embodiment, the gas branch pipe 35 further includes a third filter pipe 36, a fifth transition section 37, and a sixth transition section 38. The third filter pipe 36 removes mechanical impurities and contaminants from the pipeline, ensuring smooth refrigerant flow and preventing blockages from affecting the normal operation of the HVAC system. The third filter pipe 36 is located on the first horizontal plane and is arranged parallel to the first filter pipe 24. The fifth transition section 37 extends downward to the first horizontal plane and connects to the third filter pipe 36. The sixth transition section 38 extends upward from the third filter pipe 36 and connects to the load-side gas pipe 352. Thus, the third filter pipe 36, the fifth transition section 37, and the sixth transition section 38 combine to form another avoidance bend, allowing this part of the pipeline to pass over the bottom of the gas manifold 30a and connect to the load-side gas pipe 352, facilitating pipeline layout. In this embodiment, both the third filter pipe 36 and the first filter pipe 24 are located on the first horizontal plane, facilitating simultaneous maintenance of both pipes, reducing operational difficulty, and improving work efficiency.

[0241] It should be noted that, in one embodiment, the gas manifold 30a can be a separate pipeline. In another embodiment, the gas manifold 30a includes a high-pressure gas pipe 32 and a low-pressure gas pipe 31, branching from the gas branch pipe 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. The bypass gas pipe 33 and the branch gas pipe 34 are each equipped with at least one gas control valve 351. It can be understood that the high-pressure gas pipe 32 is mainly 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 cyclical process enables the HVAC system to continuously provide cooling.

[0242] Furthermore, in this embodiment, 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 the high-pressure gas pipe 32 and the low-pressure gas pipe 31 extend outside the housing 10 to facilitate communication with the heat source unit. Optionally, the low-pressure gas pipe 31 and the high-pressure gas pipe 32 are stacked at intervals in the disassembly and assembly direction, and the bypass gas pipe 33 and the branch gas pipe 34 are located on one side of the low-pressure gas pipe 31 and the high-pressure gas pipe 32 to facilitate pipeline layout and production.

[0243] As shown in Figures 3 to 6, in one embodiment, the main liquid pipe 221 includes a main body portion disposed on a first horizontal plane and a liquid outlet pipe. The liquid outlet pipe connects to at least one end of the main liquid pipe 221 along a first direction and extends upward along the disassembly / assembly direction. Optionally, the liquid outlet pipe is located on the side of the gas manifold 30a away from the liquid control valve 21 and is used to connect to the heat source unit. By providing the liquid outlet pipe, the portion of the main liquid pipe 221 connected to the heat source unit is not on the same vertical line as the low-pressure gas pipe 31 and the high-pressure gas pipe 32. This ensures that the liquid outlet pipe is staggered from the low-pressure gas pipe 31 and the high-pressure gas pipe 32, further avoiding interference between the gas pipe assembly 30 and the liquid pipe assembly 20, and ensuring the smooth sequential assembly of the liquid pipe assembly 20 and the gas pipe assembly 30.

[0244] The gas manifold 30a is provided with a gas pipe connection portion extending out of the housing 10 along at least one side in a first direction, specifically divided into a low-pressure gas pipe connection portion 31 and a high-pressure gas pipe connection portion 32. The liquid pipe outlet 2211 is provided with a liquid pipe connection portion 2212 extending out of the housing 10 along at least one side in the first direction. The gas pipe connection portion and the liquid pipe connection portion 2212 are used to connect to the pipelines extending from the heat source unit by means of welding, sleeve connection, etc. In one embodiment, to facilitate pipeline layout and connection operation, the gas pipe connection portion and the liquid pipe connection portion 2212 are located on the same side of the housing 10 and are arranged at intervals along the disassembly and assembly direction. The gas pipe connection portion and the liquid pipe connection portion 2212 are staggered to avoid interference and further facilitate connection operation.

[0245] The following, with reference to Figures 15-26, provides a detailed explanation of the specific structure of the tracheal assembly in some other embodiments of this application.

[0246] As shown in Figures 15-17 and 26, the refrigerant switching device 1 according to an embodiment of this application includes multiple gas manifolds, multiple first branch gas pipes 611, multiple second branch gas pipes 621, and multiple manifolds 67.

[0247] The refrigerant switching device 100 has a first direction (indicated by arrow A in the figure) and a second direction (indicated by arrow B in the figure), which are perpendicular to each other.

[0248] The gas manifold extends along a first direction, and multiple gas manifolds are spaced apart. The multiple gas manifolds include a first gas manifold 61 and a second gas manifold 62. That is, both the first gas manifold 61 and the second gas manifold 62 extend along the first direction and are spaced apart. The pressure in the first gas manifold 61 is different from the pressure in the second gas manifold 62. For example, if the pressure in the first gas manifold 61 is greater than the pressure in the second gas manifold 62, then the first gas manifold 61 is a high-pressure gas manifold and the second gas manifold 62 is a low-pressure gas manifold. Alternatively, if the pressure in the first gas manifold 61 is less than the pressure in the second gas manifold 62, then the first gas manifold 61 is a low-pressure gas manifold and the second gas manifold 62 is a high-pressure gas manifold.

[0249] Multiple first branch gas pipes 611 are connected to a first gas manifold 61, and each first branch gas pipe 611 is equipped with a first gas valve 63. Multiple second branch gas pipes 621 are connected to a second gas manifold 62, and each second branch gas pipe 621 is equipped with a second gas valve 64. A first branch gas pipe 611 and a second branch gas pipe 621 converge into a manifold 67, and each manifold 67 is equipped with a third gas valve 65. The first gas valve 63, the second gas valve 64, and the third gas valve 65 are located on the same side of the gas manifold (i.e., the first gas manifold 61 and the second gas manifold 62) in the second direction.

[0250] In this configuration, one of the load unit 200 and the heat source unit 300 is connected to the manifold 67, and the other of the load unit 200 and the heat source unit 300 is connected to the gas manifold. For example, the load unit 200 is connected to the manifold 67, and the heat source unit 300 is connected to the first gas manifold 61 and the second gas manifold 62, or the heat source unit 300 is connected to the manifold 67, and the load unit 200 is connected to the first gas manifold 61 and the second gas manifold 62.

[0251] For example, the first air valve 63, the second air valve 64, and the third air valve 65 are arranged at intervals. In the first direction, at least two of the first air valve 63, the second air valve 64, and the third air valve 65 are arranged in a staggered manner; in the second direction, the first air valve 63, the second air valve 64, and the third air valve 65 are arranged at intervals.

[0252] Compared to the prior art where the first, second, and third valves are arranged in a straight line along the second direction (i.e., the first, second, and third valves are not misaligned in the first direction), the refrigerant switching device 100 described in this application can reduce the distance between the first valve 63, second valve 64, and third valve 65 in the second direction, provided that the first valve 63, second valve 64, and third valve 65 do not interfere with each other. This makes the arrangement of the first valve 63, second valve 64, and third valve 65 more compact and reduces the volume of the refrigerant switching device 100.

[0253] Thus, the refrigerant switching device 100 according to the present utility model has the advantages of small size and compact layout.

[0254] The HVAC system 400 according to the present utility model has the advantages of small size and compact layout by setting the above-mentioned refrigerant switching device 100.

[0255] In some embodiments of this application, as shown in Figures 16 and 17, the refrigerant switching device 100 also has a third direction (indicated by arrow C in the figures). In some embodiments, the third direction can be a disassembly / reassembly direction. The first direction, the second direction, and the third direction are perpendicular to each other. Viewed along the third direction, two of the first valve 63, the second valve 64, and the third valve 65 are located on the first vertical plane V1, and the remaining valve is located on the second vertical plane V2. The first vertical plane V1 and the second vertical plane V2 are perpendicular to the first direction and are spaced apart along the first direction.

[0256] In this way, the overall size of the first valve 63, the second valve 64 and the third valve 65 in the first direction is reduced, thereby reducing the space occupied by the refrigerant switching device 100 in the first direction. This allows the refrigerant switching device 100 to take into account both the size in the first direction and the size in the second direction, thus avoiding the refrigerant switching device 100 being too large in one direction.

[0257] In some embodiments of this application, as shown in Figures 16-20, the refrigerant switching device 100 further includes a gas tee pipe 66, with a first gas valve 63, a second gas valve 64, and a third gas valve 65 all connected to the gas tee pipe 66. The gas tee pipe 66 spans a first vertical plane V1 and a second vertical plane V2.

[0258] The first gas valve 63 is located on the first vertical plane V1, and the second gas valve 64 and the third gas valve 65 are located on the second vertical plane V2. In the second direction, the second gas valve 64 is farther away from the first gas manifold 61 and the second gas manifold 62 than the third gas valve 65, and the first gas valve 63 is farther away from the first gas manifold 61 and the second gas manifold 62 than the third gas valve 65.

[0259] By setting up a gas tee 66, the first gas valve 63 and the second gas valve 64 can be connected to the third gas valve 65, eliminating the need for separate pipes between the first gas valve 63 and the third gas valve 65, or between the second gas valve 64 and the third gas valve 65. This reduces the number of pipes, facilitates disassembly and assembly, increases production efficiency, and saves space. Furthermore, in the second direction, the gas tee 66 is also located between the second gas valve 64 and the third gas valve 65. The gas tee 66 can be constructed in a "U" shape, which is beneficial for its construction and ensures high structural strength.

[0260] Further, as shown in Figures 24 and 25, each of the first air valve 63, the second air valve 64, and the third air valve 65 includes a first connecting portion 651 and a second connecting portion 652, the first connecting portion 651 extending in a second direction and the second connecting portion 652 extending in a third direction.

[0261] The first branch gas pipe 611 extends along the second direction and connects the first gas manifold 61 and the first gas valve 63 at the first connection portion 651. The second branch gas pipe 621 extends along the second direction and connects the second gas manifold 62 and the second gas valve 64 at the second connection portion 652.

[0262] The gas tee 66 includes a first pipe, a second pipe, and a third pipe that are interconnected. The first pipe, second pipe, and third pipe converge at a first vertical plane V1. The first pipe extends along a third direction and connects to a second connection 652 of a first gas valve 63. The second pipe extends along a second direction from the first vertical plane V1 to a second vertical plane V2 and connects to a first connection 651 of a second gas valve 64 at the second vertical plane V2. The third pipe extends along the second direction from the first vertical plane V1 to the second vertical plane V2 and connects to a first connection 651 of a third gas valve 65 at the second vertical plane V2. A manifold 67 is located on the second vertical plane V2 and connects to the second connection 652 of the third gas valve 65.

[0263] The first gas manifold 61 and the second gas manifold 62 are located on a third vertical plane V3, which is perpendicular to the first vertical plane V1 and the second vertical plane V2. Specifically, the central axis of the first gas manifold 61 and the central axis of the second gas manifold 62 are located on the third vertical plane V3, which is perpendicular to the second direction. This results in the first gas manifold 61 and the second gas manifold 62 having smaller dimensions in the second direction.

[0264] In some embodiments of this application, as shown in Figures 15 and 16, at least two of the orthographic projections of the first air valve 63, the second air valve 64, and the third air valve 65 have overlapping regions on a plane perpendicular to the second direction. That is, on a plane perpendicular to the second direction, the orthographic projections of the first air valve 63 and the second air valve 64 have overlapping regions, or the orthographic projections of the second air valve 64 and the third air valve 65 have overlapping regions, or the orthographic projections of the first air valve 63 and the third air valve 65 have overlapping regions.

[0265] In this way, the overall size of the first valve 63, the second valve 64 and the third valve 65 in the first direction is smaller, which helps to reduce the space occupied by the refrigerant switching device 100 in the first direction, thereby facilitating the miniaturization of the refrigerant switching device 100.

[0266] In some embodiments of this application, as shown in Figures 16 and 17, the refrigerant switching device 100 further has a third direction (indicated by arrow C in the figures), with the first direction, the second direction, and the third direction being perpendicular to each other. The axes of the first valve 63, the second valve 64, and the third valve 65 extend along the third direction, and the coils of the first valve 63, the second valve 64, and the third valve 65 are located in the fifth horizontal plane H5, which is perpendicular to the third direction.

[0267] In this way, the upper ends of the first valve 63, the second valve 64, and the third valve 65 can be located on the same plane or approximately on the same plane, and the lower ends of the first valve 63, the second valve 64, and the third valve 65 can be located on the same plane or approximately on the same plane. The overall size of the first valve 63, the second valve 64, and the third valve 65 in the third direction is smaller, which helps to reduce the space occupied by the refrigerant switching device 100 in the third direction, thereby facilitating the miniaturization of the refrigerant switching device 100.

[0268] In some embodiments of this application, as shown in FIG15, the axis of the first air valve 63 is located in the first vertical plane V1, and the axes of the second air valve 64 and the third air valve 65 are located in the second vertical plane V2. The first vertical plane V1 and the second vertical plane V2 are parallel to each other and perpendicular to the first direction.

[0269] In other words, on a plane perpendicular to the second direction, the orthographic projection of the second air valve 64 and the orthographic projection of the third air valve 65 can completely overlap, or the area of ​​the orthographic projection of the second air valve 64 is larger than the area of ​​the orthographic projection of the third air valve 65, so the orthographic projection of the second air valve 64 can cover the orthographic projection of the third air valve 65, or the area of ​​the orthographic projection of the second air valve 64 is smaller than the area of ​​the orthographic projection of the third air valve 65, so the orthographic projection of the third air valve 65 can cover the orthographic projection of the second air valve 64.

[0270] In this way, the overall size of the first valve 63, the second valve 64 and the third valve 65 in the first direction is further reduced, further reducing the space occupied by the refrigerant switching device 100 in the first direction, so that the refrigerant switching device 100 takes into account the size in the first direction and the size in the second direction, and avoids the size of the refrigerant switching device 100 being too large in one direction.

[0271] In some embodiments of this application, as shown in Figures 16-20, the refrigerant switching device 100 further includes a gas tee pipe 66, which is connected to the first gas valve 63, the second gas valve 64, and the third gas valve 65 respectively. Thus, by setting up the gas tee pipe 66, the first gas valve 63 and the second gas valve 64 can be connected to the third gas valve 65, eliminating the need for separate pipes between the first gas valve 63 and the third gas valve 65, reducing the number of pipes, facilitating disassembly and assembly, increasing production efficiency, and saving space.

[0272] In some embodiments of this application, as shown in Figures 15-17, in the second direction, the first gas valve 63 is located between the second gas valve 64 and the third gas valve 65. Thus, in the second direction, the gas tee 66 is also located between the second gas valve 64 and the third gas valve 65. The gas tee 66 can be constructed in a "U" shape, which is beneficial to the construction of the gas tee 66 and gives it high structural strength.

[0273] For example, when viewed along a third direction, there is a first distance L1 between the axis of the first air valve 63 and the axis of the second air valve 64 in a second direction, and there is a second distance L2 between the axis of the first air valve 63 and the axis of the third air valve 65 in a second direction, wherein the first distance L1 is equal to the second distance L2.

[0274] In this way, the gas tee 66 can be symmetrically arranged about the center point of the gas tee 66 in the second direction. The structure of the gas tee 66 is more symmetrical. There is no need to distinguish the direction when installing the gas tee 66, making the installation more convenient. In addition, the gas tee 66 is subjected to more uniform force.

[0275] In other embodiments of this application, in the second direction, the second gas valve 64 can be located between the first gas valve 63 and the third gas valve 65, and the gas tee 66 can be configured in an "L" shape. In this way, the arrangement of the refrigerant switching device 100 is more diverse, and the refrigerant switching device 100 can be arranged differently according to different parts to achieve a miniaturized setting of the refrigerant switching device 100.

[0276] As shown in Figures 17, 19 and 20, the gas tee 66 includes a first connecting section 661, a second connecting section 663, a third connecting section 666, a first transition section 662 and a second transition section 665, wherein the first connecting section 661, the first transition section 662, the second connecting section 663, the second transition section 665 and the third connecting section 666 are connected in sequence.

[0277] The first connecting section 661 is connected to the second air valve 64 and is located on the second vertical plane V2. The second connecting section 663 is connected to the first air valve 63 and is located on the first vertical plane V1. The third connecting section 666 is connected to the third air valve 65 and is located on the second vertical plane V2. The first transition section 662 is connected between the first connecting section 661 and the second connecting section 663. The second transition section 665 is connected between the second connecting section 663 and the third connecting section 666.

[0278] In this way, not only can the gas three-way pipe 66 be connected to the first gas valve 63, the second gas valve 64 and the third gas valve 65, but the first connecting section 661 and the third connecting section 666 are located in the second vertical plane V2, and the second connecting section 663 is located in the first vertical plane V1, ensuring that the size of the refrigerant switching device 100 in the first direction is small.

[0279] As shown in Figures 18-20, the second connecting section 663 is provided with an interface 664, which is connected to the first air valve 63. The central axis of the first transition section 662 and the central axis of the second transition section 665 are located on the inclined surface M. The angle Q between the central axis of the interface 664 and the inclined surface M is not less than 20° and not greater than 30°. For example, the angle Q can be 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, or 30°.

[0280] Specifically, the central axis of interface 664 can coincide with the axis of the first air valve 63, the first transition section 662 is inclined relative to the first vertical plane V1 and the second vertical plane V2, and the second transition section 665 is inclined relative to the first vertical plane V1 and the second vertical plane V2.

[0281] When the included angle Q is less than 20°, the distance between the first vertical plane V1 and the second vertical plane V2 is small, and the first gas valve 63 may interfere with the second branch gas pipe 621 described below, and the third gas valve 65 may interfere with the first branch gas pipe 611; when the included angle Q is greater than 30°, the distance between the first vertical plane V1 and the second vertical plane V2 is large, resulting in the refrigerant switching device 100 being too large in the first direction.

[0282] By setting the included angle Q between 20° and 30°, on the one hand, the distance between the first vertical plane V1 and the second vertical plane V2 will not be too small, which can avoid interference between the first gas valve 63 and the second branch gas pipe 621 described below, as well as avoid interference between the third gas valve 65 and the first branch gas pipe 611. On the other hand, the distance between the first vertical plane V1 and the second vertical plane V2 will not be too large, which can ensure that the size of the refrigerant switching device 100 in the first direction is small.

[0283] In some embodiments of this application, as shown in Figures 16 and 17, the central axis of the first gas manifold 61 is located on the fourth horizontal plane H4, and the central axis of the second gas manifold 62 is located on the fifth horizontal plane H5. The fifth horizontal plane H5, the fourth horizontal plane H4, and the fifth horizontal plane H5 are arranged in parallel and spaced apart, and the fourth horizontal plane H4 and the fifth horizontal plane H5 are located on the same side of the fifth horizontal plane H5.

[0284] The first branch trachea 611 is located at the fourth horizontal plane H4. The second branch trachea 621 is located at the fifth horizontal plane H5.

[0285] In this way, there will be no interference between the first branch trachea 611 and the second branch trachea 621, which facilitates the layout of the first branch trachea 611 and the second branch trachea 621. Furthermore, the first branch trachea 611 and the second branch trachea 621 are shorter in the second direction, which reduces cost and weight.

[0286] In some embodiments of this application, as shown in Figures 16 and 17, the first connecting segment 661 and the third connecting segment 666 are located on the fourth horizontal plane H4, and the second connecting segment 663 is located on the fifth horizontal plane H5. This ensures that the dimensions of the first branch gas pipe 611, the second branch gas pipe 621, and the gas tee pipe 66 remain unchanged or almost unchanged in the third horizontal direction, which is beneficial for ensuring that the dimensions of the refrigerant switching device 100 remain unchanged or almost unchanged in the third horizontal direction.

[0287] In some embodiments of this application, as shown in Figures 16 and 17, the third gas valve 65 is closer to the second gas manifold 62 than the second gas valve 64. The second branch gas pipe 621 includes a first extension 622, a second extension 623, and a third extension 624.

[0288] The first extension section 622 is connected to the second gas valve 64 and is located in the second vertical plane V2. One end of the second extension section 623 is connected to the first extension section 622. The third extension section 624 is connected to the second gas manifold 62 and is located in the first vertical plane V1. The other end of the third extension section 624 is connected to the second extension section 623. The first extension section 622 and the third gas valve 65 are spaced apart in the second direction.

[0289] Since both the second air valve 64 and the third air valve 65 are located on the second vertical plane V2, the second branch air pipe 621 would interfere with the third air valve 65 if it extends in a straight line. By setting the second extension section 623 to extend at an angle relative to the second vertical plane V2, the first extension section 622 and the third air valve 65 are spaced apart in the second direction, and the third extension section 624 and the third air valve 65 are spaced apart in the first direction, the second branch air pipe 621 can avoid the third air valve 65. Moreover, since the first extension section 622 is located on the second vertical plane V2 and the third extension section 624 is located on the first vertical plane V1, the size of the refrigerant switching device 100 in the first direction will not increase.

[0290] Furthermore, as shown in Figures 16 and 17, the fourth horizontal plane H4 is located between the fifth horizontal plane H5 and the fifth horizontal plane H5. In this way, the fifth horizontal plane H5 is further away from the coil of the third air valve 65. The outer diameter of the area where the coil of the third air valve 65 is located is larger than the outer diameter of the rest of the third air valve 65. Therefore, by setting the fifth horizontal plane H5 at a greater distance from the coil of the third air valve 65, the second extension segment 623 can avoid the third air valve 65 by tilting at a smaller angle relative to the second vertical plane V2. The setting of the second extension segment 623 is more flexible, which is conducive to improving the diversity of the structure of the second branch air pipe 621 and reducing the probability of interference.

[0291] In some embodiments of this application, as shown in Figures 15-17, the manifold 67 further includes a first air outlet 671, a filter 673, and a second air outlet 672. The first air outlet 671, the filter 673, and the second air outlet 672 can be formed into an integral structure, or the first air outlet 671, the filter 673, and the second air outlet 672 can be separately arranged and then assembled into an integral structure.

[0292] One end of the first air outlet 671 is connected to the third air valve 65. The first air outlet 671 extends away from the second air valve 64. One end of the filter 673 is connected to the other end of the first air outlet 671. The filter 673 is located below the gas manifold. The second air outlet 672 is connected to the other end of the filter 673 and extends away from the second air valve 64.

[0293] During the assembly of the refrigerant switching device 100, the second air outlet 672 may need to be welded to other pipes. In order to prevent impurities from moving to the third air valve 65 and causing it to become blocked during the welding process, a filter 673 is set to reduce the probability of impurities moving to the third air valve 65, avoid the third air valve 65 from being blocked, and ensure the normal use of the third air valve 65.

[0294] Furthermore, as shown in Figure 15, the central axis of the first air outlet 671, the central axis of the filter 673, and the central axis of the second air outlet 672 are located on the second vertical plane V2. This reduces the size of the first air outlet 671 and the second air outlet 672, lowering cost and weight. Moreover, the layout of the first air outlet 671 and the second air outlet 672 does not increase the size of the refrigerant switching device 100 in the first direction, nor does it excessively increase the size of the refrigerant switching device 100 in the first direction, which is beneficial for the miniaturization of the refrigerant switching device 100.

[0295] In some embodiments of this application, as shown in FIG17, the inner diameter of filter 673 is larger than the inner diameter of the first air outlet 671, and the inner diameter of filter 673 is larger than the inner diameter of the second air outlet 672. By setting the inner diameter of filter 673 to be larger, it is possible to avoid filter 673 affecting the pressure of refrigerant switching device 100 and ensure the flow efficiency of refrigerant in refrigerant switching device 100.

[0296] As shown in Figures 2 and 21, the refrigerant switching device 100 also includes a housing 10 and a liquid pipe assembly 20. The liquid pipe assembly 20 and the gas manifold are installed inside the housing 10. The side plate 112 of the housing 10 is provided with three through ports. The liquid pipe assembly 20, the first gas manifold 61 and the second gas manifold 62 each pass through one through port and extend out of the housing 10.

[0297] As shown in Figures 22-24, a support rod 69 is provided inside the housing 10. The support rod 69 is located below the end of the gas tee pipe 66 connected to the second gas valve 64, and is used to support that end. A vibration damping pad 68 may be provided between the gas tee pipe 66 and the support rod 69 to absorb the movement forces of the gas tee pipe 66 and the support rod 69, reducing their impact on each other's position and installation stability.

[0298] In addition, the support rod 69 is connected to the crimping part 80, which is located at the end where the gas three-way pipe 66 is connected to the second gas valve 64. The support rod 69 and the crimping part 80 surround the end where the gas three-way pipe 66 is connected to the second gas valve 64 to prevent the gas three-way pipe 66 from shaking.

[0299] In addition, the relative positions of the first gas manifold 61 and the second gas manifold 62 are fixed by the fastener 70 to avoid the relative positions of the first gas manifold 61 and the second gas manifold 62, thereby reducing the difficulty of installation and improving production efficiency.

[0300] Referring to Figures 2 and 27, in some embodiments, the housing 10 includes a housing body 11, a chassis 12, and a support beam 13. The chassis 12 is disposed at the bottom of the housing body 11 and connected to the housing body 11. The support beam 13 is connected to the housing body 11 for mounting the liquid tubing assembly 20 and the gas tubing assembly 30.

[0301] 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. 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 port 112a is provided on the load-side side plate 1121 for the load-side liquid pipe 232 and load-side gas pipe 352 communicating with the load unit to pass through, while a heat source-side port 112b is provided on the heat source-side side plate 1122 for the gas pipe connection part and liquid pipe connection part 2212 communicating with the heat source unit to pass through. The electronic control components of the refrigerant switching device 100 are mounted on the chassis 12 and located near the electronic control side plate 1123. The detachable connection between the chassis 12 and the housing body 11 can be a connection between the chassis 12 and multiple side plates 112. Specifically, protruding connecting lugs or similar structures can be provided on the chassis 12, and these structures can be detachably connected to the chassis 12 using screws or other threaded structures, thus achieving a detachable connection between the chassis 12 and the housing body 11.

[0302] 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 and the gas pipe assembly 30 above the chassis 12. This allows for direct maintenance of parts of the liquid pipe assembly 20 and the gas pipe assembly 30 when the chassis 12 is disassembled.

[0303] For example, the liquid pipe assembly 20 and the air pipe assembly 30 are provided with at least one filter pipe and at least one one-way valve, with the filter pipe and the one-way valve located on the horizontal plane of the liquid pipe assembly 20 and the air pipe near the chassis 12. Specifically, the first filter pipe 24 and the third filter pipe 36 are both located on the first horizontal plane, which is located near the chassis 12. In addition, the bypass liquid pipe and the branch liquid pipe 225 are both provided with one-way valves to achieve unidirectional flow, and the bypass liquid pipe and the branch liquid pipe 225 are arranged side by side on the first horizontal plane. Thus, after the chassis 12 is removed, the first filter pipe 24, the third filter pipe 36, the bypass liquid pipe, and the branch liquid pipe 225 are all exposed in the opening of the housing 10 after the chassis 12 is removed, and are located at the bottom of the liquid pipe assembly 20 and the air pipe assembly 30, allowing workers to directly perform maintenance, disassembly, and other operations, making the operation more convenient and improving work efficiency.

[0304] The supporting crossbeam 13 includes a liquid pipe crossbeam 131 and an air pipe crossbeam 132, which are spaced apart along a second direction and extend along a first direction. The liquid pipe crossbeam 131 is used to mount the liquid pipe assembly 20, and the air pipe crossbeam 132 is used to mount the air pipe assembly 30. During assembly, the liquid pipe assembly 20 is first installed by fixing the liquid pipe crossbeam 131, and then the air pipe assembly 30 is installed by fixing the air pipe crossbeam 132. This facilitates the installation of the liquid pipe assembly 20 and the air pipe assembly 30 in two separate steps.

[0305] Referring to Figures 28 to 30, in some embodiments, the refrigerant switching device 100 further includes a buffer 16. The buffer 16 is disposed between the liquid pipe assembly 20 and the chassis 12 to fill the gap between the bottom structure of the liquid pipe assembly 20 and the chassis 12, thereby improving the stability of the liquid pipe assembly 20 and the gas pipe assembly 30. This prevents the liquid pipe assembly 20 and the gas pipe assembly 30 from impacting the housing 10 and causing structural damage when the refrigerant switching device 100 shakes, thus improving structural reliability.

[0306] Optionally, to improve the cushioning effect, the buffer 16 can be made of sponge or rubber, which has sufficient elasticity and provides better cushioning while providing support. Further, as shown in Figure 31, the buffer 16 may also be provided with contoured grooves, and at least a portion of the liquid pipe assembly 20 is disposed within these grooves. Exemplarily, the buffer 16 covers the portion containing the liquid manifold 22a and has multiple contoured grooves. The main liquid pipe 221, the heating branch liquid pipe 223, and the cooling branch liquid pipe 222 are respectively disposed within these grooves. The size of the contoured grooves is adapted to each pipe section, thereby further improving the stability of the liquid pipe assembly 20 and the gas pipe assembly 30.

[0307] 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.

[0308] 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.

[0309] As shown in Figures 32 and 33, in some structural configurations, the refrigerant switching device 100 further includes a subcooling assembly 50. The subcooling assembly 50 is located 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.

[0310] 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.

[0311] 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.

[0312] Please refer to Figures 34 to 37. Figure 34 shows the refrigerant flow diagram when all load units in the HVAC system provided in this embodiment are in cooling mode; Figure 35 shows the refrigerant flow diagram when all load units in the HVAC system provided in this embodiment are in heating mode; Figure 36 shows the refrigerant flow diagram when most load units in the HVAC system provided in this embodiment are in cooling mode; and Figure 37 shows the refrigerant flow diagram when most load units in the HVAC system provided in this embodiment are in heating mode. For ease of description, the operating mode of the load units shown in the figures is referred to as the full cooling mode, the operating mode of the load units shown in the figures is referred to as the full heating mode, the operating mode of the load units shown in the figures is referred to as the main cooling mode, and the operating mode of the load units shown in the figures is referred to as the main heating mode.

[0313] As shown in Figure 34, in full refrigeration mode, the refrigerant flows in the following direction: 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.

[0314] As shown in Figure 35, 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 → indoor unit liquid pipe → branch liquid pipe 225 → refrigerant branch liquid pipe 222 → main liquid pipe 221 → heat source unit. This completes one heating cycle.

[0315] As shown in Figure 36, 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.

[0316] 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.

[0317] As shown in Figure 37, 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.

[0318] 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.

[0319] 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.

[0320] 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," and "right" 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.

[0321] 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, wherein, The application relates to a heat exchanger, comprising: a housing; a liquid pipe assembly and a gas pipe assembly arranged separately, the liquid pipe assembly and the gas pipe assembly being mounted in the housing, and the gas pipe assembly and the liquid pipe assembly not interfering with each other in a dismounting direction in which one of the gas pipe assembly and the liquid pipe assembly is moved closer to or further away from the other. The liquid pipe assembly defines a mounting space which is open in the dismounting direction, and a main body part of the gas pipe assembly is arranged in the mounting space.

2. The refrigerant switching device according to claim 1, wherein In the dismounting direction, the main body part of the gas pipe assembly is arranged in layers with the main body part of the liquid pipe assembly.

3. The refrigerant switching device according to claim 1, wherein The liquid pipe assembly comprises 4. The refrigerant switching device according to claim 3, wherein a liquid control valve; and a liquid pipe line comprising a liquid pipe joint arranged to be connected to a heat source unit and a load-side liquid pipe arranged to be connected to a load unit, the liquid control valve being connected to the liquid pipe line to control the flow rate or opening and closing of a flow path of the liquid pipe line; wherein the liquid control valve and the load-side liquid pipe are arranged on opposite sides of a main body part of the liquid pipe line, and the main body part of the gas pipe assembly is arranged between the liquid control valve and the load-side liquid pipe and in layers with the main body part of the liquid pipe line. The liquid pipe assembly comprises:

5. The refrigerant switching device according to claim 1, wherein a liquid control valve arranged to control the flow rate or opening and closing of a flow path of the liquid pipe assembly, the liquid control valve comprising a heat source-side connecting part and a load-side connecting part; a first pipe line connected to the heat source-side connecting part, the first pipe line being closer to a heat source unit than the liquid control valve, a main body part of the first pipe line being arranged on a first horizontal plane; and a second pipe line connected to the load-side connecting part, a main body part of the second pipe line being arranged on a second horizontal plane, and an end of the second pipe line away from the load-side connecting part being provided with a load-side liquid pipe; wherein the second horizontal plane is arranged above the first horizontal plane. The first pipe line comprises at least one liquid header and a plurality of liquid branch pipes connected to the liquid header, the liquid header being arranged to extend along a first direction and being arranged to be spaced apart from the liquid control valve along a second direction, each of the liquid branch pipes extending along the second direction, one end of each of the liquid branch pipes being connected to one of the heat source-side connecting parts, and the other end being connected to the liquid header, the first direction being parallel to the first horizontal plane, the first direction and the second direction being perpendicular to each other and to the dismounting direction.

6. The refrigerant switching device according to claim 5, wherein The load-side connecting part extends along the dismounting direction, and the load-side connecting part is arranged above the first horizontal plane, and the heat source-side connecting part extends along the second direction and closer to the liquid header; 7. The refrigerant switching device according to claim 6, wherein The first pipe line comprises a first main body pipe and a first transition part, the first main body pipe being arranged on the first horizontal plane, and the first transition part extending upward from the first main body pipe to the heat source-side connecting part; The second pipe line comprises a second main body pipe and a second transition part, the second main body pipe being arranged on the second horizontal plane, and the second transition part extending upward from the second main body pipe to the load-side connecting part. ​ 8. The refrigerant switching device according to claim 7, wherein The second pipeline comprises a first filter pipe and a third transition part, the first filter pipe is located on the first horizontal plane, and the third transition part extends downward from the second main pipe to the first horizontal plane and is connected with the first filter pipe.

9. The refrigerant switching device according to claim 8, wherein The second pipeline further comprises a fourth transition part, the load-side liquid pipe is higher than the second horizontal plane and extends along the second direction, one end of the fourth transition part is connected with the first filter pipe, and the other end extends upward and is connected with the load-side liquid pipe.

10. The refrigerant switching device according to claim 9, wherein The first filter pipe is located on the side of the liquid header away from the liquid control valve.

11. The refrigerant switching device according to claim 7, wherein The second main pipe comprises an avoidance part, the avoidance part bypasses the first transition part, and the rest of the second main pipe is located on the vertical plane where the load-side connection part and the heat source-side connection part are located.

12. The refrigerant switching device according to claim 7, wherein The number of the liquid headers is three, which are a total liquid pipe, a refrigeration branch liquid pipe and a heating branch liquid pipe, the total liquid pipe is arranged to communicate with the heat source unit, the refrigeration branch liquid pipe and the heating branch liquid pipe are formed from the total liquid pipe, two liquid branches are formed from each first main pipe and are defined as a branch liquid pipe and a bypass liquid pipe, each branch liquid pipe communicates to the heating branch liquid pipe and is configured to have a single flow direction from the branch liquid pipe to the heating branch liquid pipe, and each bypass liquid pipe communicates to the refrigeration branch liquid pipe and is configured to have a single flow direction from the refrigeration branch liquid pipe to the bypass liquid pipe.

13. The refrigerant switching device according to claim 12, wherein One end of the total liquid pipe in the first direction communicates with 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 other end of the total liquid pipe in the first direction communicates with one end of the heating branch liquid pipe in the first direction, and the other end of the heating branch liquid pipe in the first direction is a closed end.

14. The refrigerant switching device according to claim 12, wherein The total liquid pipe, the refrigeration branch liquid pipe and the heating branch liquid pipe are all located on the first horizontal plane; and / or At least part of the branch liquid pipe and at least part of the bypass liquid pipe are arranged side by side and located on the first horizontal plane.

15. The refrigerant switching device according to claim 12, wherein The total liquid pipe, the refrigeration branch liquid pipe and the heating branch liquid pipe are arranged spaced apart along the second direction, the bypass liquid pipe is provided with a bending part, the bending part bends upward and over the heating branch liquid pipe to be connected with the refrigeration branch liquid pipe.

16. The refrigerant switching device according to claim 15, wherein The bending part is not higher than the second horizontal plane.

17. The refrigerant switching device according to claim 12, wherein The first main pipe further comprises a liquid three-way pipe, one end of the liquid three-way pipe is connected with the first transition part, and the other two ends of the liquid three-way pipe respectively communicate with the branch liquid pipe and the bypass liquid pipe. The liquid three-way pipe is located on the first horizontal plane.

18. The refrigerant switching device according to claim 12, wherein The part of the first transition part located on the first horizontal plane connects the branch liquid pipe and the bypass liquid pipe, and the part of the first transition part located on the first horizontal plane is arranged in a detour along the second direction.

19. The refrigerant switching device according to claim 12, wherein A second filter pipe is arranged between the first transition part and the heat source-side connection part.

20. The refrigerant switching device according to claim 12, wherein The branch liquid pipe, the bypass liquid pipe and the second main pipe are respectively located on different vertical planes.

21. The refrigerant switching device according to claim 5, wherein The load-side liquid pipe and the liquid control valve are arranged in a spaced manner, the main body part of the first pipeline and the main body part 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 higher than the second level.

22. The refrigerant switching device according to claim 12, wherein The gas pipe assembly comprises: A gas header pipe arranged along the first direction; Gas branch pipes arranged in a spaced manner along the first direction, the gas branch pipes being gathered in the gas header pipe, the gas header pipe being closer to the heat source unit than each of the gas branch pipes; and Gas control valves connected to the gas branch pipes, so that each of the gas branch pipes is provided with at least one gas control valve, and a plurality of the gas control valves are arranged in at least one column along the first direction; Wherein, the gas header pipe and one column of the gas control valves are arranged at both ends of the gas branch pipes along the second direction, and the gas header pipe and the gas control valves are located between the liquid control valve and the load-side liquid pipe.

23. The refrigerant switching device according to claim 22, wherein The gas branch pipes further comprise load-side gas pipes for connecting the load unit, the load-side gas pipes being located on the side of the gas header pipe away from the gas control valves; A plurality of the load-side gas pipes are arranged in a spaced manner along the first direction, and are arranged in a staggered manner with the load-side liquid pipe in the disassembly direction.

24. The refrigerant switching device according to claim 22, wherein The second pipeline comprises a first filter pipe, the first filter pipe being located on the first level, and the gas header pipe being located above the first filter pipe.

25. The refrigerant switching device according to claim 24, wherein The gas branch pipes further comprise a third filter pipe, a fifth transition part and a sixth transition part, the third filter pipe being located on the first level and arranged side by side with the first filter pipe, the fifth transition part extending downward to the first level and connected with the third filter pipe, and the sixth transition part extending upward from the third filter pipe and connected with the load-side gas pipe.

26. The refrigerant switching device according to claim 22, wherein The gas header pipe comprises a high-pressure gas pipe and a low-pressure gas pipe, the gas header pipe being branched from the gas branch pipes to form two gas branches, which are defined as a bypass gas pipe and a branch gas pipe, the bypass gas pipe corresponding to the low-pressure gas pipe, and the branch gas pipe corresponding to the high-pressure gas pipe, at least one gas control valve being arranged on each of the bypass gas pipe and the branch gas pipe; Wherein, the high-pressure gas pipe and the low-pressure gas pipe are arranged in a spaced manner in the disassembly direction.

27. The refrigerant switching device according to claim 22, wherein The total liquid pipe comprises a liquid pipe leading pipe extending upward, the liquid pipe leading pipe being located on the side of the gas header pipe away from the liquid control valve.

28. The refrigerant switching device according to claim 27, wherein The gas header pipe is provided with a gas pipe connecting part penetrating out of the shell along at least one side of the first direction, and the liquid pipe leading pipe is provided with a liquid pipe connecting part penetrating out of the shell along at least one side of the first direction; The gas pipe connecting part and the liquid pipe connecting part are located on the same side of the shell and are arranged in a spaced manner along the disassembly direction, and the gas pipe connecting part and the liquid pipe connecting part are arranged in a staggered manner.

29. The refrigerant switching device according to any one of claims 6 to 28, wherein Further comprising a pressure relief assembly, the pressure relief assembly comprising: A pressure relief header pipe extending along the first direction; A plurality of pressure relief branch pipes arranged in a spaced manner along the first direction, the pressure relief branch pipes extending along the second direction and being connected to the pressure relief header pipe at one end and to the second pipeline at the other end; and A pressure relief valve is arranged in the pressure relief main pipe or the pressure relief branch pipe.

30. The refrigerant switching device according to claim 29, wherein The main body of the pressure relief main pipe is located at the first horizontal plane, and the main body of the pressure relief branch pipe is located at the second horizontal plane.

31. The refrigerant switching device according to claim 30, wherein 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.

32. The refrigerant switching device according to claim 30, wherein 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 any one of the branch liquid pipe and the bypass liquid pipe.

33. The refrigerant switching device according to claim 1, wherein The refrigerant switching device has a first direction and a second direction, and the first direction and the second direction are perpendicular to each other; The refrigerant switching device comprises: A plurality of gas headers extend along the first direction, and a plurality of the gas headers are arranged at intervals and include a first gas header and a second gas header, the pressure in the first gas header being different from the pressure in the second gas header; A plurality of first branch gas pipes communicate with the first gas header, and the first branch gas pipes are provided with first gas valves; A plurality of second branch gas pipes communicate with the second gas header, and the second branch gas pipes are provided with second gas valves; A plurality of manifold pipes are provided, one of the first branch gas pipes and one of the second branch gas pipes are gathered into one of the manifold pipes, the manifold pipes are arranged to communicate with load units, and are provided with third gas valves; Among them, the first gas valve, the second gas valve and the third gas valve are located on the same side of the first gas header and the second gas header in the second direction.

34. The refrigerant switching device according to claim 33, wherein The first direction, the second direction, the third direction, and the disassembly direction are perpendicular to each other; When viewed along the disassembly direction, two of the first gas valve, the second gas valve and the third gas valve are located on a first vertical plane, and the remaining one is located on a second vertical plane, and the first vertical plane and the second vertical plane are perpendicular to the first direction and are arranged at intervals along the first direction.

35. The refrigerant switching device according to claim 34, wherein Further comprising: A gas tee is connected to the first gas valve, the second gas valve, and the third gas valve; The first gas valve is located on the first vertical plane, and the second gas valve and the third gas valve are located on the second vertical plane; In the second direction, the second gas valve is farther away from the first gas header and the second gas header than the third gas valve, and the first gas valve is farther away from the first gas header and the second gas header than the third gas valve; The gas tee spans the first vertical plane and the second vertical plane.

36. The refrigerant switching device according to claim 35, wherein Each of the first gas valve, the second gas valve, and the third gas valve comprises a first connecting portion and a second connecting portion, the first connecting portion extends in the second direction, and the second connecting portion extends in the disassembly direction; The first branch gas pipe extends along the second direction, connecting the first connecting portion of the first gas header and the first gas valve; The second branch air pipe extends along the second direction and connects the second gas collecting pipe and the second connecting part of the second gas valve; The gas tee pipe comprises a first pipe, a second pipe and a third pipe which are in communication with each other, a meeting point of the first pipe, the second pipe and the third pipe is located on the first vertical plane, the first pipe extends along the dismounting direction and is connected to the second connecting part of the first gas valve, the second pipe extends along the second direction and extends from the first vertical plane to the second vertical plane and is connected to the first connecting part of the second gas valve on the second vertical plane, and the third pipe extends along the second direction and extends from the first vertical plane to the second vertical plane and is connected to the first connecting part of the third gas valve on the second vertical plane; The manifold is located on the second vertical plane and is connected to the second connecting part of the third gas valve.

37. The refrigerant switching device according to claim 34, wherein The first gas collecting pipe and the second gas collecting pipe are located on a third vertical plane which is perpendicular to the first vertical plane and the second vertical plane.

38. The refrigerant switching device according to claim 33, wherein At least two of the first gas valve, the second gas valve and the third gas valve have an overlapping area in the projection on a plane which is perpendicular to the second direction.

39. The refrigerant switching device according to claim 33, wherein The refrigerant switching device further has a dismounting direction, the first direction, the second direction and the dismounting direction are perpendicular to each other; The axis of the first gas valve, the axis of the second gas valve and the axis of the third gas valve extend along the dismounting direction; The first gas valve, the second gas valve and the third gas valve are located on the same horizontal level and on a third horizontal plane which is perpendicular to the dismounting direction.

40. The refrigerant switching device according to claim 39, wherein The axis of the first gas valve is located on a first vertical plane, the axis of the second gas valve and the axis of the third gas valve are located on a second vertical plane, and the first vertical plane and the second vertical plane are parallel to each other and are arranged perpendicularly to the first direction.

41. The refrigerant switching device according to claim 40, wherein Further comprising: A gas tee pipe which is in communication with the first gas valve, the second gas valve and the third gas valve respectively.

42. The refrigerant switching device according to claim 41, wherein In the second direction, the first gas valve is located between the second gas valve and the third gas valve.

43. The refrigerant switching device according to claim 41, wherein In the second direction, the first gas valve is located between the second gas valve and the third gas valve.

44. The refrigerant switching device according to claim 41, wherein In the second direction, the first gas valve is located between the second gas valve and the third gas valve. The gas tee pipe comprises; A first connecting section which is in communication with the second gas valve and is located on the second vertical plane; A second connecting section which is in communication with the first gas valve and is located on the first vertical plane; A third connecting section which is in communication with the third gas valve and is located on the second vertical plane; A first transition section which is connected between the first connecting section and the second connecting section; and A second transition section which is connected between the second connecting section and the third connecting section.

45. The refrigerant switching device according to claim 44, wherein The second connecting section is provided with an interface which is in communication with the first gas valve; The central axis of the first transition section and the central axis of the second transition section are located on an inclined surface, and the central axis of the interface has an angle with the inclined surface, which is not less than 20° and not greater than 30°.

46. The refrigerant switching device according to claim 44, wherein The central axis of the first gas collector is located on a fourth horizontal plane, the central axis of the second gas collector is located on a fifth horizontal plane, and the third horizontal plane, the fourth horizontal plane and the fifth horizontal plane are arranged in parallel and are spaced apart. The first branch gas pipe is located on the fourth horizontal plane, and the second branch gas pipe is located on the fifth horizontal plane. The fourth horizontal plane and the fifth horizontal plane are located on the same side of the third horizontal plane.

47. The refrigerant switching device according to claim 46, wherein The first connecting section and the third connecting section are located on the fourth horizontal plane. The second connecting section is located on the fifth horizontal plane.

48. The refrigerant switching device according to claim 40, wherein The third gas valve is closer to the second gas collector relative to the second gas valve. The second branch gas pipe comprises: A first extension section in communication with the second gas valve and located on the second vertical plane; A second extension section, one end of the second extension section being in communication with the first extension section; A third extension section in communication with the second gas collector and located on the first vertical plane, the third extension section being in communication with the other end of the second extension section; The first extension section and the third gas valve are spaced apart in the second direction.

49. The refrigerant switching device according to claim 48, wherein The central axis of the first gas collector is located on a fourth horizontal plane, the central axis of the second gas collector is located on a fifth horizontal plane, and the third horizontal plane, the fourth horizontal plane and the fifth horizontal plane are arranged in parallel and are spaced apart. The fourth horizontal plane is located between the third horizontal plane and the fifth horizontal plane.

50. The refrigerant switching device according to claim 40, wherein The manifold further comprises: A first gas outlet, one end of the first gas outlet being in communication with the third gas valve and extending away from the second gas valve; A filter, one end of the filter being in communication with the other end of the first gas outlet and located below the gas collector; A second gas outlet in communication with the other end of the filter and extending away from the second gas valve.

51. The refrigerant switching device according to claim 50, wherein The central axis of the first gas outlet, the central axis of the filter and the central axis of the second gas outlet are located on the second vertical plane.

52. The refrigerant switching device according to claim 50, wherein The inner diameter of the filter is greater than the inner diameter of the first gas outlet; and / or The inner diameter of the filter is greater than the inner diameter of the second gas outlet.

53. The refrigerant switching device of any one of claims 33-52, wherein, The central axis of the first gas collector and the central axis of the second gas collector are located on a third vertical plane, and the third vertical plane is arranged perpendicularly to the second direction.

54. The refrigerant switching device as set forth in claim 35 or 41, wherein, Further comprising: The side plate of the shell is provided with a pipe passing opening, the first gas valve, the second gas valve, the third gas valve, the first branch gas pipe, the second branch gas pipe and the gas collector are arranged in the shell, and the gas collector extends out of the shell through the pipe passing opening.

55. The refrigerant switching device according to claim 54, wherein The shell is internally provided with a gas pipe cross beam, a damping pad and a press-fit part, the gas pipe cross beam is located below one end of the gas three-way pipe connected with the second gas valve and is arranged to support the gas three-way pipe, the damping pad is located between the gas three-way pipe and the gas pipe cross beam, and the press-fit part is connected with the gas pipe cross beam and is arranged above the gas three-way pipe.

56. The refrigerant switching device according to claim 54, wherein The first gas header and the second gas header are respectively connected with a fixing part, and the fixing part is located in the shell to fix the relative positions of the first gas header and the second gas header.

57. The refrigerant switching device of any one of claims 1 to 56, wherein, The shell comprises a shell body and a bottom plate, the bottom plate is arranged at the bottom of the shell body and is detachably connected with the shell body, and the liquid pipe assembly is connected with the shell body and is arranged in a spaced manner with the bottom plate.

58. The refrigerant switching device according to claim 57, wherein The shell further comprises: A support cross beam connected with the shell body to carry the liquid pipe assembly and the gas pipe assembly, and the bottom plate is detachably connected with the shell body.

59. The refrigerant switching device according to claim 58, wherein The shell body comprises a top plate and a plurality of side plates arranged around the top plate, and the plurality of side plates define an open top arranged downward, and the bottom plate seals the open top. The opposite ends of the support cross beam are respectively connected with two opposite side plates.

60. The refrigerant switching device according to claim 59, wherein The support cross beam comprises liquid pipe cross beams and gas pipe cross beams arranged in a spaced manner along a second direction and extending along a first direction, and the first direction is perpendicular to the second direction. The liquid pipe cross beams are arranged to carry the liquid pipe assembly, and the gas pipe cross beams are arranged to carry the gas pipe assembly.

61. The refrigerant switching device according to claim 57, wherein The main body part of the gas pipe assembly is suspended on the main body part of the liquid pipe assembly, the part of the liquid pipe assembly located in the shell is suspended on the bottom plate, and the refrigerant switching device further comprises: A buffer member filled between the liquid pipe assembly and the bottom plate.

62. The refrigerant switching device according to claim 61, wherein The buffer member is a sponge or rubber member; and / or The buffer member is provided with a profiled groove, and at least part of the liquid pipe assembly is located in the profiled groove.

63. The refrigerant switching device according to claim 57, wherein The liquid pipe assembly and the gas pipe assembly are provided with at least one filter pipe and at least one one-way valve, and at least one of the filter pipes and at least one of the one-way valves are located at the horizontal plane of the liquid pipe assembly and the gas pipe close to the bottom plate.

64. An air conditioning system wherein, Comprise: A heat source unit; A load unit; And The refrigerant switching device according to any one of claims 1 to 63, wherein the liquid pipe assembly and the gas pipe assembly communicate the heat source unit and the load unit.

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