Valve assembly, heat source side unit and refrigerant circulation system

Abstract

The present invention relates to the technical field of HVAC equipment, and discloses a valve assembly, a heat source side unit, and a refrigerant circulation system. The valve assembly includes a first connecting main pipe, a second connecting main pipe, and a plurality of valve bodies. Each valve body is provided with a first valve connecting pipe and a second valve connecting pipe, and a main valve located between the first valve connecting pipe and the second valve connecting pipe for controlling the refrigerant flow between the first valve connecting pipe and the second valve connecting pipe. The pipe wall of the first connecting main pipe is provided with a plurality of first connecting holes, and the plurality of first connecting holes are connected to the plurality of first valve connecting pipes in a one-to-one correspondence. The pipe wall of the second connecting main pipe is provided with a plurality of second connecting holes, and the plurality of second connecting holes are connected to the plurality of second valve connecting pipes in a one-to-one correspondence. The present invention provides a first connecting main pipe and a second connecting main pipe, and the pipe walls of the two are respectively provided with a plurality of first connecting holes and a second connecting hole. These connecting holes are connected to the valve connecting pipes of each valve body in a one-to-one correspondence, thereby reducing the use of pipeline materials and tee joints, reducing material costs and installation costs, and saving installation space.

Description

Technical Field

[0001] The present invention relates to the technical field of HVAC equipment, and in particular to a valve assembly, a heat source side unit and a refrigerant circulation system. Background Art

[0002] In the refrigeration (heating) system, it generally includes components such as a compressor, an electronic expansion valve, an oil separator, a condenser and a refrigeration device. The electronic expansion valve uses the electrical signal generated by the adjusted parameter to control the voltage or current applied to the expansion valve, thereby achieving the purpose of adjusting the liquid supply.

[0003] However, when the caliber of the electronic expansion valve cannot meet the flow requirement, two or more electronic expansion valves need to be connected in parallel, usually by connecting the two or more electronic expansion valves through a tee. This connection method will increase the installation space and require more installation pipes and tee joints for connection, increasing costs. Summary of the Invention

[0004] The purpose of the present invention is to at least solve the problem of increased installation space and increased costs caused by the use of more pipes. This purpose is achieved through the following technical solutions:

[0005] A first aspect of the present invention provides a valve assembly comprising a first connecting manifold, a second connecting manifold, and a plurality of valve bodies;

[0006] Each valve body is provided with a first valve connecting pipe and a second valve connecting pipe, and a main valve located between the first valve connecting pipe and the second valve connecting pipe, and the main valve controls the refrigerant flow between the first valve connecting pipe and the second valve connecting pipe;

[0007] The wall of the first connecting main pipe is provided with a plurality of first connecting holes, and the plurality of first connecting holes are connected to the plurality of first valve connecting pipes in a one-to-one correspondence;

[0008] The wall of the second connecting main pipe is provided with a plurality of second connecting holes, and the plurality of second connecting holes are connected to the plurality of second valve connecting pipes in a one-to-one correspondence;

[0009] One axial end of the first connecting manifold is configured as an open end, which is defined as a first open end, and the other axial end of the first connecting manifold is configured as a closed end, which is defined as a first closed end. The first open end is fluidically connected to an external first pipe, and the plurality of first connection holes are closer to the first closed end than to the first open end.

[0010] Multiple first connection holes are arranged in rows and spaced apart along the axial direction of the first connecting main pipe. The average spacing between the multiple first connection holes is defined as a first spacing, and the spacing between the first closed end and the closest first connection hole is defined as a second spacing, wherein the second spacing is smaller than the first spacing.

[0011] The valve assembly of the present invention connects the first valve connecting pipes and the second valve connecting pipes of multiple valve bodies in a centralized manner by setting a first connecting main pipe and a second connecting main pipe, thereby avoiding the complex pipeline layout and numerous connection points in the traditional three-way pipe connection method. The pipe walls of the first connecting main pipe and the second connecting main pipe are respectively provided with multiple first connecting holes and second connecting holes, and these connecting holes are connected to the valve connecting pipes of the valve bodies in a one-to-one correspondence. The connection method is simple and direct, saving pipeline materials and the use of three-way joints, reducing material costs and installation costs, and at the same time reducing the pipeline length and space occupied by the connection. It is particularly suitable for occasions with limited space and saves installation space.

[0012] In addition, the valve assembly according to the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, one axial end of the second connecting main pipe is configured as an open end, which is defined as the second open end, and the other axial end of the second connecting main pipe is configured as a closed end, which is defined as the second closed end. The second open end fluid is connected to the second external piping, and the plurality of second connection holes are closer to the second closed end than to the second open end.

[0014] In some embodiments of the present invention, the first connecting manifold comprises a first vertical section and a first horizontal section extending from the first vertical section in a bent manner, wherein an end of the first vertical section away from the first horizontal section is configured as the first open end, the first open end is opened axially upward, and an end of the first horizontal section away from the first vertical section is configured as the first closed end, a plurality of first connecting holes are provided in the first horizontal section, and the plurality of first connecting holes are opened axially upward; and / or

[0015] The second connecting main pipe has a second vertical section and a second horizontal section extending from the second vertical section. The end of the second vertical section away from the second horizontal section is configured as the second open end, and the second open end is opened upward along the axial direction. The end of the second horizontal section away from the second vertical section is configured as the second closed end. A plurality of second connecting holes are arranged in the second horizontal section and the plurality of second connecting holes are opened upward along the axial direction.

[0016] In some embodiments of the present invention, the end of the first valve connecting pipe opens downward, and the end of the first valve connecting pipe is connected to the corresponding first connecting hole from top to bottom. The end of the second valve connecting pipe opens downward, and the end of the second valve connecting pipe is connected to the corresponding second connecting hole from top to bottom.

[0017] In some embodiments of the present invention, the first connection hole is formed by integrally flanging the wall of the first connecting main pipe, and the end of the first valve connecting pipe is directly or indirectly welded to the cylindrical inner wall of the first connection hole; and / or,

[0018] The second connection hole is formed by integrally flanging the wall of the second connecting main pipe, and the end of the first valve connecting pipe is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole.

[0019] In some embodiments of the present invention, the first connecting main pipe, the second connecting main pipe, the first valve connecting pipe and the second valve connecting pipe are all made of a first material, and the first material is any one of stainless steel, copper, copper alloy, aluminum and aluminum alloy.

[0020] In some embodiments of the present invention, the first valve connecting pipe end is inserted into the first connecting hole and fixedly welded to the hole wall of the first connecting hole, and the second valve connecting pipe end is inserted into the second connecting hole and fixedly welded to the hole wall of the second connecting hole.

[0021] In some embodiments of the present invention, the first material is stainless steel, the first connection hole and the second connection hole both have an inner circumferential surface and an outer circumferential surface, the inner circumferential surface or the outer circumferential surface is connected to a first transition portion, the first valve connecting pipe end and the second valve connecting pipe end are connected to a second transition portion, the first transition portion is sleeved with the second transition portion, the first transition portion is constructed as a copper tube or includes a copper plating, and the second transition portion is constructed as a copper tube or includes a copper plating.

[0022] In some embodiments of the present invention, the first connecting main pipe and the second connecting main pipe are made of a first material, and the first valve connecting pipe and the second valve connecting pipe are made of a second material. The first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy. The second material is one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy and is different from the first material.

[0023] In some embodiments of the present invention, the first material is stainless steel, the second material is any one of copper, copper alloy, aluminum, and aluminum alloy, the first connection hole and the second connection hole both have an inner circumferential surface and an outer circumferential surface, the inner circumferential surface or the outer circumferential surface is connected to a first transition portion, and the first transition portion is made of the second material.

[0024] In some embodiments of the present invention, each valve body is one or more of an electronic expansion valve, a solenoid valve, and a unloading valve.

[0025] In some embodiments of the present invention, a total-divided-total refrigerant flow path is formed between the first open end and the second open end, the first open end is connected to a first filter, and the second open end is connected to a second filter.

[0026] A second aspect of the present invention provides a heat source side unit, comprising:

[0027] at least one compressor, the compressor compressing a refrigerant and having an exhaust port for discharging the compressed refrigerant;

[0028] a heat source heat exchanger, wherein the heat source heat exchanger exchanges heat with an external heat source;

[0029] a first stop valve comprising a first external pipe and a first control valve, wherein the first external pipe forms a liquid side interface of the heat source side unit;

[0030] a second stop valve, comprising a second external pipe and a second control valve, wherein the second external pipe forms a gas side interface of the heat source side unit;

[0031] a hot / cold mode switching valve, the hot / cold mode switching valve selectively switching the exhaust port to the heat source heat exchanger or to the second stop valve;

[0032] The valve assembly as described in any one of the above items is provided on the flow path between the first stop valve and the liquid side of the heat source heat exchanger.

[0033] In some embodiments of the present invention, a subcooling component is included, the subcooling component is arranged between the valve component and the first stop valve, the subcooling component includes a main circuit and an auxiliary circuit, the refrigerant in the auxiliary circuit subcools the refrigerant in the main circuit, the first connecting manifold of the valve component is connected to the liquid side of the heat source heat exchanger, and the second connecting manifold is connected to the main circuit;

[0034] A control module is included, and each valve body of the valve assembly is an electronic expansion valve. The control module is communicated with each electronic expansion valve. When the heat source side unit is in cooling mode, the control module controls the opening of each electronic expansion valve according to the actual subcooling degree and the target subcooling degree.

[0035] In some embodiments of the present invention, when the actual supercooling degree is less than the target supercooling degree, the control module controls the opening of each electronic expansion valve to increase; when the actual supercooling degree is greater than the target supercooling degree, the control module controls the opening of each electronic expansion valve to decrease; when the actual supercooling degree is equal to the target supercooling degree, the control module controls the opening of each electronic expansion valve to remain unchanged.

[0036] In some embodiments of the present invention, the actual subcooling degree is the ambient temperature of the heat source side unit minus the liquid side outlet temperature of the heat source heat exchanger; and the target subcooling degree is a preset value.

[0037] In some embodiments of the present invention, the first connecting main pipe is provided with a first temperature sensor, which is used to detect the liquid side outlet temperature of the heat source heat exchanger; the windward side of the heat source heat exchanger is provided with a second temperature sensor, which detects the ambient temperature of the heat source side unit.

[0038] In some embodiments of the present invention, it further includes a liquid side main pipe and a liquid side branch pipe.

[0039] The liquid side main pipe is configured to communicate with the main line and the first stop valve.

[0040] The liquid side branch pipe includes a first branch pipe and a second branch pipe, and the two ends of the auxiliary road are connected to the first branch pipe and the second branch pipe respectively. The first branch pipe diverges from the liquid side main pipe and is connected to one end of the auxiliary road, and the second branch pipe is connected from the other end of the auxiliary road to the compressor return port.

[0041] The first branch pipe has a third control valve, which includes a third valve connecting pipe and a fourth valve connecting pipe. A third connecting hole is opened on the pipe wall of the liquid side main pipe. The third valve connecting pipe is inserted into the third connecting hole, and the fourth valve connecting pipe is connected to one end of the auxiliary line.

[0042] In some embodiments of the present invention, a gas-liquid separation component is further included, and the gas-liquid separation component is arranged between the hot and cold mode switching valve and the compressor return air port.

[0043] In some embodiments of the present invention, the hot and cold mode switching valve includes a switching valve body, and a first interface portion, a second interface portion, a third interface portion and a fourth interface portion provided on the switching valve body, the first interface portion being connected to the compressor exhaust port, the second interface portion being connected to the heat source heat exchanger, the third interface portion being connected to the compressor return air port, and the fourth interface portion being connected to the second stop valve, and the switching valve body can selectively switch between a heating mode and a cooling mode, the first interface portion being connected to the second interface portion in the cooling mode, the third interface portion being connected to the fourth interface portion, and the second interface portion being connected to the third interface portion in the heating mode,

[0044] The first interface portion is disposed at the bottom of the switching valve body and extends downward from the bottom of the switching valve body.

[0045] The second interface portion, the third interface portion, and the fourth interface portion are arranged side by side on the top of the switching valve body, and extend upward from the top of the switching valve body.

[0046] In some embodiments of the present invention, there are two compressors, and the exhaust ports of the two compressors are connected to the first interface portion via a three-way manifold.

[0047] The third aspect of the novel invention provides a refrigerant circulation system, comprising:

[0048] The heat source side unit as described in any one of the above items;

[0049] at least one utilization side unit;

[0050] a liquid pipe connecting the liquid side interface of the heat source side unit and the liquid side interface of the utilization side unit;

[0051] an air pipe connecting the air side interface of the heat source side unit and the air side interface of the utilization side unit;

[0052] The heat source side unit, the utilization side unit, the liquid pipe, and the gas pipe form a refrigerant circulation circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0054] Figure 1 The structure diagram of a valve assembly according to an embodiment of the present invention is schematically shown in a first viewing angle;

[0055] Figure 2 for Figure 1 The structure diagram of the valve assembly shown is from a second viewing angle;

[0056] Figure 3 for Figure 1 The valve assembly shown is a partial structural schematic diagram from a first viewing angle;

[0057] Figure 4 The structure diagram of a valve assembly according to an embodiment of the present invention is schematically shown;

[0058] Figure 5 Schematically shows a connection diagram of a first connecting manifold and a first valve connecting pipe of a valve assembly according to an embodiment of the present invention;

[0059] Figure 6 Schematically shows a connection diagram of a first connecting manifold and a first valve connecting pipe of a valve assembly according to an embodiment of the present invention;

[0060] Figure 7 Schematically shows a connection diagram of a first connecting manifold and a first valve connecting pipe of a valve assembly according to an embodiment of the present invention;

[0061] Figure 8 The structure diagram of a valve assembly according to an embodiment of the present invention is schematically shown;

[0062] Figure 9 The structure diagram of a valve assembly according to an embodiment of the present invention is schematically shown;

[0063] Figure 10 Schematically shows the structural diagram of the heat source side unit provided according to the present invention;

[0064] Figure 11 The structure diagram of a refrigerant circulation system according to an embodiment of the present invention is schematically shown;

[0065] Figure 12 A diagram schematically illustrates the refrigerant flow in a refrigerant circulation system in a cooling mode according to an embodiment of the present invention;

[0066] Figure 13 The figure schematically shows the refrigerant flow diagram of a refrigerant circulation system in heating mode according to the present invention.

[0067] The reference numerals are as follows:

[0068] 1000. Refrigerant circulation system;

[0069] 100, heat source side unit; 200, utilization side unit; 210, utilization side heat exchanger; 300, liquid pipe; 301, liquid side main pipe; 3011, third connection hole; 3021, first branch pipe; 3022, second branch pipe; 400, gas pipe;

[0070] 10. Valve assembly; 101. Electronic expansion valve; 102. Solenoid valve;

[0071] 20. Compressor; 201. Compressor body; 2011. Compressor return air port; 2012. Compressor exhaust port; 202. Compressor exhaust pipe; 203. Compressor return air pipe;

[0072] 30. Heat source heat exchanger;

[0073] 40. First stop valve; 401. First external pipe; 402. First control valve;

[0074] 50, second stop valve; 501, second external pipe; 502, second control valve;

[0075] 60, hot and cold mode switching valve; 601, switching valve body; 602, first interface; 603, second interface; 604, third interface; 605, fourth interface;

[0076] 70, subcooling assembly; 701, main line; 702, auxiliary line; 703, third control valve; 7031, third valve connection; 7032, fourth valve connection;

[0077] 80. Gas-liquid separation component;

[0078] 90. Oil separator; 901. Oil separator body; 902. Oil separator inlet pipe; 903. Oil separator outlet pipe; 904. Oil return capillary tube; 905. Filter assembly; 906. Pressure relief pipe; 907. Pressure relief valve;

[0079] 1. Valve body; 11. First valve connecting pipe; 12. Second valve connecting pipe;

[0080] 2. First connecting main pipe; 21. First vertical section; 22. First horizontal section; 221. First connecting hole; 23. First open end; 24. First closed end; 25. First end cap;

[0081] 3. Second connecting main pipe; 31. Second vertical section; 32. Second horizontal section; 321. Second connecting hole; 33. Second open end; 34. Second closed end; 35. Second end cap;

[0082] 41. First transition portion; 42. Second transition portion;

[0083] 5. First filter;

[0084] 6. Second filter;

[0085] 7. First temperature sensor. DETAILED DESCRIPTION

[0086] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0087] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0088] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0089] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped over, an element described as "below" or "beneath" another element or feature would then be oriented "above" or "above" the other element or feature. Thus, the example term "below" can encompass both above and below orientations.

[0090] In related technologies, the refrigeration (heating) system generally includes components such as a compressor, an electronic expansion valve, an oil separator, a condenser and a refrigeration device. The electronic expansion valve uses the electrical signal generated by the adjusted parameters to control the voltage or current applied to the expansion valve, thereby achieving the purpose of regulating the liquid supply.

[0091] However, when the caliber of the electronic expansion valve cannot meet the flow requirement, two or more electronic expansion valves need to be connected in parallel, usually by connecting the two or more electronic expansion valves through a tee. This connection method will increase the installation space and require more installation pipes and tee joints for connection, increasing costs.

[0092] In view of this, the present embodiment provides a valve assembly 10, which aims to solve the above technical problems by setting a first connecting main pipe 2 and a second connecting main pipe 3, and the pipe walls of the two are respectively provided with multiple first connecting holes 221 and second connecting holes, which are connected one-to-one with the valve connecting pipes of each valve body 1, reducing the use of pipeline materials and three-way joints, reducing costs, and saving installation space.

[0093] like Figures 1 to 9 As shown, according to an embodiment of the present invention, a valve assembly 10 is proposed. The valve assembly 10 includes a plurality of valve bodies 1, a first connecting main pipe 2, and a second connecting main pipe 3. Each valve body 1 is provided with a first valve connecting pipe 11 and a second valve connecting pipe 12, and a main valve located between the first valve connecting pipe 11 and the second valve connecting pipe 12. The main valve controls the refrigerant flow of the first valve connecting pipe 11 and the second valve connecting pipe 12. The main valve adjusts the refrigerant flow as needed, for example, by rotating or moving the valve core to change the cross-sectional area of ​​the refrigerant channel, thereby controlling the flow rate and flow of the refrigerant. The wall of the first connecting main pipe 2 is provided with a plurality of first connecting holes 221, and the plurality of first connecting holes 221 are connected to the plurality of first valve connecting pipes 11 in a one-to-one correspondence. The wall of the second connecting main pipe 3 is provided with a plurality of second connecting holes 321, and the plurality of second connecting holes 321 are connected to the plurality of second valve connecting pipes 12 in a one-to-one correspondence.

[0094] The valve assembly 10 of the present invention connects the first valve connecting pipes 11 and the second valve connecting pipes 12 of multiple valve bodies 1 in a centralized manner by setting a first connecting main pipe 2 and a second connecting main pipe 3, thereby avoiding the complex pipeline layout and numerous connection points in the traditional three-way pipe connection method. The pipe walls of the first connecting main pipe 2 and the second connecting main pipe 3 are respectively provided with multiple first connecting holes 221 and second connecting holes 321, which are connected one-to-one with the valve connecting pipes of the valve body 1. The connection method is simple and direct, saving pipeline materials and the use of three-way joints, reducing material costs and installation costs. In addition, compared with the traditional method, each electronic expansion valve 101 needs to be connected through a separate three-way pipe, this method not only takes up a large space, but also requires a large number of connecting pipes and three-way joints, which increases the cost and installation difficulty. The connection method of the present invention reduces the pipeline length and space occupied by the connection, and is particularly suitable for occasions with limited space, saving installation space.

[0095] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, one axial end of the first connecting manifold 2 is configured as an open end, which is defined as the first open end 23, and the other axial end of the first connecting manifold 2 is configured as a closed end, which is defined as the first closed end 24. The first open end 23 fluid is connected to the first external piping, and the plurality of first connecting holes 221 are closer to the first closed end 24 than the first open end 23; and / or, one axial end of the second connecting manifold 3 is configured as an open end, which is defined as the second open end 33, and the other axial end of the second connecting manifold 3 is configured as a closed end, which is defined as the second closed end 34. The second open end 33 fluid is connected to the second external piping, and the plurality of second connecting holes 321 are closer to the second closed end 34 than the second open end 33.

[0096] Specifically, the first connecting manifold 2 has two axial ends, a first open end 23 and a first closed end 24. The end of the first connecting manifold 2 away from the first open end 23 is connected to a first end cap 25 to form the first closed end 24. The multiple first connection holes 221 on the first connecting manifold 2 are located closer to the first closed end 24 than to the first open end 23. The second connecting manifold 3 has two axial ends, a second open end 33 and a second closed end 34. The end of the second connecting manifold 3 away from the second open end 33 is connected to a second end cap 35 to form the second closed end 34. The multiple second connection holes 321 on the second connecting manifold 3 are located closer to the first closed end 24 than to the first open end 23. By setting the first connecting hole 221 at a position close to the first closed end 24 and the second connecting hole 321 at a position close to the second closed end 34, the flow path of the refrigerant in the connecting main pipe is smoother, and the swirl and vortex of the refrigerant in the first connecting main pipe 2 and the second connecting main pipe 3 are reduced, so that the refrigerant can be more evenly distributed to each valve body 1 through the first connecting main pipe 2 and the second connecting main pipe 3, reducing the unevenness of local flow, improving the performance of the system, and reducing the pressure fluctuations in the refrigerant flow, thereby improving the operating stability of the system.

[0097] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the first connecting main pipe 2 has a first vertical section 21 and a first horizontal section 22 bent and extended from the first vertical section 21, the end of the first vertical section 21 is configured as a first open end 23, the first open end 23 is open upward along the axial direction, the end of the first horizontal section 22 is configured as a first closed end 24, the first closed end 24 is oriented horizontally along the axial direction, a plurality of first connecting holes 221 are provided in the first horizontal section 22 and the plurality of first connecting holes 221 are open upward along the axial direction; and / or, the second connecting main pipe 3 has a second vertical section 31 and a second horizontal section 32 bent and extended from the second vertical section 31, the end of the second vertical section 31 is configured as a second open end 33, the second open end 33 is open upward along the axial direction, the end of the second horizontal section 32 is configured as a second closed end 34, the second closed end 34 is oriented horizontally along the axial direction, a plurality of second connecting holes 321 are provided in the second horizontal section 32 and the plurality of second connecting holes 321 are open upward along the axial direction.

[0098] Specifically, the first connecting main pipe 2 includes a first vertical section 21, and the end of the first vertical section 21 away from the first horizontal section 22 is a first open end 23. The first open end 23 is axially open upward, and the refrigerant can flow into the first connecting main pipe 2 from above, which is convenient for connection with external pipes or equipment, and is also conducive to the inflow of refrigerant. The first horizontal section 22 is vertically connected to the end of the first vertical section 21 away from the first open end 23. A plurality of first connecting holes 221 are provided on the first horizontal section 22 and are axially open upward, so that after the refrigerant flows into the first vertical section 21, it will be distributed to the first valve connecting pipes 11 of each valve body 1 through the first connecting holes 221 on the first horizontal section 22. The upward opening design facilitates the smooth flow of refrigerant into the valve body 1, and can also reduce the retention of refrigerant in the first connecting main pipe 2.

[0099] The second connecting main pipe 3 includes a second vertical section 31. The end of the second vertical section 31 away from the second horizontal section 32 is a second open end 33. The second open end 33 is axially open upward, and the refrigerant can flow into the second connecting main pipe 3 from above, which is convenient for connection with external pipes or equipment, and is also conducive to the inflow of refrigerant. The second horizontal section 32 is vertically connected to the end of the second vertical section 31 away from the second open end 33. A plurality of second connecting holes 321 are provided on the second horizontal section 32 and are axially open upward, so that after the refrigerant flows into the second vertical section 31, it will be distributed to the second valve connecting pipe 12 of each valve body 1 through the second connecting holes 321 on the second horizontal section 32. The upward opening design facilitates the smooth flow of refrigerant into the valve body 1, and can also reduce the retention of refrigerant in the second connecting main pipe 3.

[0100] In some embodiments of the present invention, Figure 3 As shown, the end of the first valve connecting pipe 11 opens downward, and the end of the first valve connecting pipe 11 is connected to the corresponding first connecting hole 221 from top to bottom. The end of the second valve connecting pipe 12 opens downward, and the end of the second valve connecting pipe 12 is connected to the corresponding second connecting hole 321 from top to bottom.

[0101] Specifically, the end of the first valve connecting pipe 11 is designed to open downward, so that after the refrigerant flows into the first connecting hole 221 of the first connecting main pipe 2, it will flow downward into the first valve connecting pipe 11. The end of the first valve connecting pipe 11 is connected to the corresponding first connecting hole 221 from top to bottom. This connection method ensures that the refrigerant can smoothly flow from the first connecting main pipe 2 into the first valve connecting pipe 11, while saving space and making the entire valve assembly 10 more compact. The end of the second valve connecting pipe 12 is also designed to open downward, so that the refrigerant will flow downward from the second valve connecting pipe 12 into the second connecting main pipe 3. The end of the second valve connecting pipe 12 is connected to the corresponding second connecting hole 321 from top to bottom. This connection method ensures that the refrigerant can smoothly flow from the second valve connecting pipe 12 into the second connecting main pipe 3, while saving space and making the entire valve assembly 10 more compact.

[0102] In some embodiments of the present invention, Figure 4 As shown, a plurality of first connection holes 221 are arranged in rows and spaced apart along the axial direction of the first connecting main pipe 2, the average spacing between the plurality of first connection holes 221 is defined as a first spacing, and the spacing between the first closed end 24 and the closest first connection hole 221 is defined as a second spacing, wherein the second spacing is smaller than the first spacing.

[0103] Specifically, in this embodiment, the number of first connection holes 221 is two, and the first spacing is the distance between the center axes of the two first connection holes 221. The number of first connection holes 221 can also be three, four, or five, etc., and the spacing between two adjacent first connection holes 221 is L1, L2, L3, etc. The average spacing, i.e., the first spacing, is calculated by adding the values ​​of L1, L2, L3, etc. and dividing it by the total number of spacings. The second spacing D is the distance between the end surface of the first end cap 25 closest to the first horizontal section 22 and the center axis of the first connection hole 221 closest to the first end cap 25. By setting the second spacing to be smaller than the first spacing, the refrigerant can be more evenly distributed to each valve body 1 after entering the first connecting main pipe 2, thereby accurately controlling the refrigerant flow and improving the efficiency of the system; furthermore, when the refrigerant entering the first connecting main pipe 2 exists in two phases of gas and liquid, the second spacing D is set to be smaller than the first spacing, so that the refrigerant impacts the first end cover 25 before flowing into the first valve connecting pipe 11, thereby making the gas-liquid mixing of the refrigerant more uniform, thereby reducing the noise of the refrigerant passing through the valve assembly 10 and improving the life of the valve assembly 10.

[0104] In some embodiments of the present invention, Figure 3 As shown, the first connection hole 221 is formed by an integral flange of the pipe wall of the first connecting main pipe 2, and the end of the first valve connecting pipe 11 is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole 221; and / or, the second connection hole 321 is formed by an integral flange of the pipe wall of the second connecting main pipe 3, and the end of the first valve connecting pipe 11 is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole 221.

[0105] Specifically, the first connection hole 221 is formed directly from the wall material of the first connecting manifold 2 through a flanging process. The end of the first valve connecting pipe 11 can be welded directly to the cylindrical inner wall of the first connection hole 221, or through an intermediate component (such as a short tube or connector). The flanging process ensures that there is no seam between the first connection hole 221 and the wall of the first connecting manifold 2, thereby improving the sealing and structural strength of the connection. The second connection hole 321 is formed directly from the wall material of the second connecting manifold 3 through a flanging process. The end of the second valve connecting pipe 12 can be welded directly to the cylindrical inner wall of the second connection hole 321, or through an intermediate component (such as a short tube or connector). The flanging process ensures that there is no seam between the first connection hole 221 and the wall of the first connecting manifold 2, and between the second connection hole 321 and the wall of the second connecting manifold 3, thereby improving the sealing and structural strength of the connection. The first connection hole 221 and the second connection hole 321 formed by the flanging process have a cylindrical inner wall, which provides a good connection foundation for the connection of the first valve connecting pipe 11 and the second valve connecting pipe 12, and improves the connection stability and the sealing of the connection.

[0106] In some embodiments of the present invention, Figure 5 As shown, the first connecting main pipe 2, the second connecting main pipe 3, the first valve connecting pipe 11 and the second valve connecting pipe 12 are all made of a first material, which is any one of stainless steel, copper, copper alloy, aluminum and aluminum alloy.

[0107] The first connecting main pipe 2, the second connecting main pipe 3, the first valve connecting pipe 11, and the second valve connecting pipe 12 are made of the same material, which can be stainless steel, copper, copper alloy, aluminum, or aluminum alloy. This material can reduce vibration stress while also providing a certain structural strength to prevent scratches during transportation or use that could affect the service life. For example, these pipes can all be copper pipes, which have better welding properties and are convenient for connection to other pipelines. Alternatively, these pipes can all be stainless steel pipes, which have higher corrosion resistance and strength.

[0108] In some embodiments of the present invention, the end of the first valve connecting pipe 11 is inserted into the first connecting hole 221 and welded to the hole wall of the first connecting hole 221 , and the end of the second valve connecting pipe 12 is inserted into the second connecting hole 321 and welded to the hole wall of the second connecting hole 321 .

[0109] For example, the first material is copper. The first connecting manifold 2 and the first valve connecting pipe 11 are both made of copper. When the two are connected, the first valve connecting pipe 11 can be directly welded at the first connection hole 221 to connect the first valve connecting pipe 11 and the first connecting manifold 2. It will be appreciated that when the second connecting manifold 3 and the second valve connecting pipe 12 are both made of copper, when the two are connected, the second valve connecting pipe 12 can be directly welded at the second connection hole 321 to connect the second valve connecting pipe 12 and the second connecting manifold 3.

[0110] In some embodiments of the present invention, Figure 7 As shown, the first material is stainless steel, the inner circumference or outer circumference of the first connecting hole 221 and the second connecting hole 321 is connected with a first transition portion 41, the end of the first valve connecting pipe 11 and the second valve connecting pipe 12 are connected with a second transition portion 42, the first transition portion 41 is sleeved with the second transition portion 42, the first transition portion 41 is constructed as a copper tube or copper plating, and the second transition portion 42 is constructed as a copper tube or copper plating.

[0111] Specifically, the first connecting manifold 2, the first valve connecting pipe 11, the second connecting manifold 3, and the second valve connecting pipe 12 are all stainless steel pipes. A copper tube or copper plating is connected to the inner or outer circumference of the first connecting hole 221. The end of the first valve connecting pipe 11 is provided with a copper tube or copper plating. The first valve connecting pipe 11 and the first connecting manifold 2 are welded together via the copper tube or copper plating. The inner or outer circumference of the second connecting hole 321 is connected to a copper tube or copper plating. The end of the second valve connecting pipe 12 is provided with a copper tube or copper plating. The second valve connecting pipe 12 and the second connecting manifold 3 are welded together via the copper tube or copper plating.

[0112] In some embodiments of the present invention, the first connecting main pipe 2 and the second connecting main pipe 3 are made of a first material, and the first valve connecting pipe 11 and the second valve connecting pipe 12 are made of a second material. The first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy. The second material is one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy and is different from the first material.

[0113] The first connecting main pipe 2 and the second connecting main pipe 3 are made of the same material, which can be stainless steel, copper, copper alloy, aluminum, or aluminum alloy. The first valve connecting pipe 11 and the second valve connecting pipe 12 are made of the same material, which can be stainless steel, copper, copper alloy, aluminum, or aluminum alloy. The first connecting main pipe 2 and the second connecting main pipe 3 are made of a different material from the first valve connecting pipe 11 and the second valve connecting pipe 12. For example, the first connecting main pipe 2 and the second connecting main pipe 3 are both stainless steel pipes, and the first valve connecting pipe 11 and the second valve connecting pipe 12 are both copper pipes. Alternatively, the first connecting main pipe 2 and the second connecting main pipe 3 are both copper alloy pipes, and the first valve connecting pipe 11 and the second valve connecting pipe 12 are both stainless steel pipes.

[0114] In some embodiments of the present invention, the first material is stainless steel, the second material is any one of copper, copper alloy, aluminum, and aluminum alloy, and the inner or outer surface of the first connecting hole 221 and the second connecting hole 321 are connected with a first transition portion 41, and the first transition portion 41 is made of the second material.

[0115] For example, Figure 6As shown, when both the first connecting manifold 2 and the second connecting manifold 3 are stainless steel pipes, and the first valve connecting pipe 11 and the second valve connecting pipe 12 are copper pipes, the first valve connecting pipe 11 is a copper pipe, and a copper sleeve is connected to the inner or outer circumference of the first connecting hole 221. The first valve connecting pipe 11 is welded to the first connecting manifold 2 via the copper sleeve. Similarly, the second valve connecting pipe 12 is a copper pipe, and a copper sleeve is connected to the inner or outer circumference of the second connecting hole 321. The second valve connecting pipe 12 is welded to the second connecting manifold 3 via the copper sleeve. The provision of the transition portion provides excellent welding performance, ensuring a secure and well-sealed connection between the first valve connecting pipe 11 and the first connecting manifold 2, and between the second valve connecting pipe 12 and the second connecting manifold 3. Furthermore, the transition portion can be used to connect pipes made of different materials, thus providing strong applicability.

[0116] In some embodiments of the present invention, each valve body 1 is one or more of an electronic expansion valve 101 , a solenoid valve, and an unloading valve.

[0117] The number of valve bodies 1 in the valve assembly 10 of the present invention can be two or three, etc., and each valve body 1 can be an electronic expansion valve 101, or can be a solenoid valve, or can be a unloading valve. Alternatively, one electronic expansion valve 101 and one solenoid valve can be provided for each valve body, or three electronic expansion valves 101 or three solenoid valves can be provided.

[0118] In one example, if Figure 8 As shown, the valve body 1 is three electronic expansion valves 101, which are connected in parallel. Each electronic expansion valve 101 is provided with a first valve connecting pipe 11 and a second valve connecting pipe 12. The first valve connecting pipe 11 is connected to the first connecting main pipe 2, and the second valve connecting pipe 12 is connected to the second connecting main pipe 3.

[0119] In one example, if Figure 9 As shown, the valve body 1 is composed of three solenoid valves, which are connected in parallel with each other. After being connected in parallel, the three solenoid valves are respectively connected with the first connecting main pipe 2 and the second connecting main pipe 3.

[0120] In some embodiments of the present invention, Figure 1 As shown, the valve assembly 10 has a first open end 23 and a second open end 33. The first open end 23 is formed on the first connecting main pipe 2, and the second open end 33 is formed on the second connecting main pipe 3. A total-divided-total refrigerant flow path is formed between the first open end 23 and the second open end 33. The first open end 23 is connected to the first filter 5, and the second open end 33 is connected to the second filter 6.

[0121] Specifically, the refrigerant can enter the first connecting manifold 2 (total) from the first open end 23, be distributed to the first valve connecting pipes 11 of each valve body 1 through the first connecting manifold 2 (distribution), then, after being regulated by the main body valve, be collected into the second connecting manifold 3 through the second valve connecting pipe 12, and finally flow out from the second open end 33 (total). Alternatively, the refrigerant can enter the second connecting manifold 3 (total) from the second open end 33, be distributed to the second valve connecting pipes 12 of each valve body 1 through the second connecting manifold 3 (distribution), then, after being regulated by the main body valve, be collected into the first connecting manifold 2 through the first valve connecting pipe 11, and finally flow out from the first open end 23 (total).

[0122] A first filter 5 is provided at the first open end 23. The first filter 5 is used to filter the refrigerant entering the first connecting manifold 2, removing impurities, particulate matter, and possible contaminants in the refrigerant. This prevents these impurities from entering the valve assembly 10 and clogging the valve body 1 or affecting system performance, thereby reducing the risk of clogging and wear and improving the reliability and stability of the system. Similarly, a second filter 6 is provided at the second open end 33. The second filter 6 is used to filter the refrigerant entering the second connecting manifold 3.

[0123] The second aspect of the present invention provides a heat source side unit 100, such as Figure 10 As shown, the heat source side unit 100 includes at least one compressor 20 , a heat source heat exchanger 30 , a first stop valve 40 , a second stop valve 50 and the valve assembly 10 mentioned above.

[0124] Among them, the compressor 20 compresses the refrigerant, provides power for the refrigerant circulation, and has a compressor exhaust port 2012 for discharging the compressed refrigerant. The heat source heat exchanger 30 exchanges heat with the external heat source. In the cooling mode, the refrigerant absorbs heat in the heat source heat exchanger 30 to achieve cooling; in the heating mode, the refrigerant releases heat in the heat source heat exchanger 30 to achieve heating. The first stop valve 40 includes a first external pipe 401 and a first control valve 402. The first external pipe 401 forms the liquid side interface of the heat source side unit and is used to connect the pipeline of the liquid refrigerant. The first control valve 402 is used to control the flow of the liquid refrigerant and can open or close the liquid side passage. The second stop valve 50 includes a second external pipe 501 and a second control valve 502. The second external pipe 501 forms the gas side interface of the heat source side unit and is used to connect the pipeline of the gaseous refrigerant. The second control valve 502 is used to control the flow of the gaseous refrigerant and can open or close the gas side passage.

[0125] The cooling / heating mode switching valve 60 selectively switches the flow of the compressor exhaust port 2012 between the heat source heat exchanger 30 and the second shut-off valve 50. The valve assembly 10 is disposed in the flow path between the first shut-off valve 40 and the liquid side of the heat source heat exchanger 30. In cooling mode, the compressor exhaust port 2012 flows into the heat source heat exchanger 30, where the refrigerant absorbs heat. In heating mode, the compressor exhaust port 2012 flows into the second shut-off valve 50, where the refrigerant releases heat.

[0126] The heat source side unit 100 of the present invention can realize the effective circulation of refrigerant, flow regulation and switching of hot and cold modes by integrating the compressor 20, the heat source heat exchanger 30, the stop valve and the valve assembly 10, which not only improves the versatility and flexibility of the system, but also ensures the efficient operation and reliability of the system through reasonable component layout and function allocation.

[0127] In some embodiments of the present invention, a subcooling assembly 70 and a control module are included. The subcooling assembly 70 is arranged between the valve assembly 10 and the first stop valve 40. The subcooling assembly 70 includes a main circuit 701 and an auxiliary circuit 702. The refrigerant in the auxiliary circuit 702 subcools the refrigerant in the main circuit 701, reducing the temperature of the refrigerant in the main circuit 701, thereby improving the refrigeration efficiency. The first connecting main pipe 2 of the valve assembly 10 is connected to the liquid side of the heat source heat exchanger 30, and the second connecting main pipe 3 is connected to the main circuit 701. Each valve body 1 of the valve assembly 10 is an electronic expansion valve 101, which is used to accurately control the refrigerant flow. The control module is in communication with each electronic expansion valve 101. When the heat source side unit is in cooling mode, the control module controls the opening of each electronic expansion valve 101 based on the actual subcooling degree and the target subcooling degree.

[0128] In cooling mode, the compressor 20 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant and discharges it through the compressor exhaust port 2012. The hot / cold mode switching valve 60 connects the compressor exhaust port 2012 to the heat source heat exchanger 30. The high-temperature, high-pressure gaseous refrigerant enters the heat source heat exchanger 30, absorbs heat from the external heat source, and the refrigerant temperature increases. After the refrigerant flows out of the liquid side of the heat source heat exchanger 30, it enters the main path 701 of the supercooling component 70. The refrigerant in the auxiliary path 702 supercools the refrigerant in the main path 701 through heat exchange, reducing the temperature of the refrigerant in the main path 701. The supercooled refrigerant enters the valve assembly 10 through the first connecting main pipe 2 of the valve assembly 10. The electronic expansion valve 101 adjusts the flow rate of the refrigerant according to the instructions of the control module. The control module dynamically adjusts the opening of each electronic expansion valve 101 by monitoring the difference between the actual supercooling degree and the target supercooling degree to ensure that the temperature and flow rate of the refrigerant meet the system requirements.

[0129] In some embodiments of the present invention, when the actual supercooling degree is less than the target supercooling degree, the control module controls the opening of each electronic expansion valve 101 to increase. By increasing the opening of the electronic expansion valve 101, the flow rate of the refrigerant is increased, so that the refrigerant stays longer during heat exchange, thereby reducing the temperature of the refrigerant and increasing the supercooling degree to make it close to the target value.

[0130] When the actual degree of subcooling is greater than the target degree of subcooling, the control module controls each electronic expansion valve 101 to reduce its opening. By reducing the opening of the electronic expansion valve 101, the flow rate of the refrigerant is reduced, and the residence time of the refrigerant during heat exchange is shortened, thereby increasing the temperature of the refrigerant and reducing the degree of subcooling to make it close to the target value.

[0131] When the actual subcooling degree equals the target subcooling degree, the control module controls the opening degree of each electronic expansion valve 101 to remain unchanged. The consistency between the actual subcooling degree and the target subcooling degree indicates that the system is operating at its optimal state. Maintaining the opening degree of each electronic expansion valve 101 remains unchanged, maintaining the current refrigerant flow rate and temperature, and ensuring stable operation of the system.

[0132] It should be noted that when adjusting the refrigerant flow, the opening of each electronic expansion valve 101 is the same, which can make the refrigerant flow more uniform, reduce pressure fluctuations and temperature changes in the system, ensure uniform temperature and pressure distribution of the entire system, and thus improve the stability of the system.

[0133] In some embodiments of the present invention, the actual subcooling degree is the ambient temperature of the heat source unit minus the liquid outlet temperature of the heat source heat exchanger 30; the target subcooling degree is a preset value. The ambient temperature of the heat source unit is the temperature of the environment in which the heat source unit is located, which can be measured by an ambient temperature sensor. The refrigerant temperature at the liquid outlet of the heat source heat exchanger 30 can be measured by a temperature sensor. The target subcooling degree is a preset value, set based on the specific requirements and design parameters of the system.

[0134] In some embodiments of the present invention, the first connecting main pipe 2 is provided with a first temperature sensor 7, which is used to detect the liquid side outlet temperature of the heat source heat exchanger 30; a second temperature sensor (not shown in the figure) is provided on the windward side of the heat source heat exchanger 30, which detects the ambient temperature of the heat source side unit.

[0135] The first temperature sensor 7 is installed on the first connecting main pipe 2. It can be set close to the liquid side outlet of the heat source heat exchanger 30, or it can be set at any position of the first connecting main pipe 2. The first temperature sensor 7 is used to detect the refrigerant temperature at the liquid side outlet of the heat source heat exchanger 30.

[0136] Since the windward side refers to the side that is directly exposed to the airflow when the heat source heat exchanger 30 is in contact with the external environment, the second temperature sensor is set on the windward side of the heat source heat exchanger 30, which can quickly respond to changes in ambient temperature. The measured temperature can better reflect the actual temperature of the environment in which the heat source heat exchanger 30 is located, thereby ensuring the accuracy of temperature detection.

[0137] In some embodiments of the present invention, a liquid side main pipe 301 and a liquid side branch pipe are further included. The liquid side main pipe 301 is configured to connect the main line 701 and the first stop valve 40. The liquid side branch pipe includes a first branch pipe 3021 and a second branch pipe 3022. The two ends of the auxiliary line 702 are respectively connected to the first branch pipe 3021 and the second branch pipe 3022. The first branch pipe 3021 diverges from the liquid side main pipe 301 and is connected to one end of the auxiliary line 702. The second branch pipe 3022 is connected from the other end of the auxiliary line 702 to the compressor return air port 2011. The first branch pipe 3021 has a third control valve 703. The third control valve 703 includes a third valve pipe 7031 and a fourth valve pipe 7032. A third connecting hole 3011 is opened on the pipe wall of the liquid side main pipe 301. The third valve pipe 7031 is plugged into the third connecting hole 3011. The fourth valve pipe 7032 is connected to one end of the auxiliary line 702.

[0138] The liquid side branch pipe is a branch pipe branching out from the liquid side main pipe 301, which is used to distribute liquid to different branches. The first branch pipe 3021 branches out from the liquid side main pipe 301 and is connected to one end of the auxiliary road 702, guiding the liquid in the liquid side main pipe 301 to the auxiliary road 702, and providing liquid input for the auxiliary road 702. The second branch pipe 3022 is connected to the compressor return air port 2011 from the other end of the auxiliary road 702, and transports the liquid or gas in the auxiliary road 702 to the compressor return air port 2011, completing the reflux of the refrigerant. A third control valve 703 is provided on the first branch pipe 3021, and the third control valve 703 includes a third valve pipe 7031 and a fourth valve pipe 7032, wherein the third valve pipe 7031 is connected to the liquid side main pipe 301, and the fourth valve pipe 7032 is connected to the end of the auxiliary road 702 away from the liquid side main pipe 301. Specifically, the liquid-side main pipe 301 is provided with a third connection hole 3011, which is formed directly from the wall material of the liquid-side main pipe 301 through a flanging process. The end of the third valve connecting pipe 7031 can be welded directly to the cylindrical inner wall of the third connection hole 3011, or welded through an intermediate component (such as a short pipe or connector). The flanging process ensures that there is no seam between the third connection hole 3011 and the wall of the third valve connecting pipe 7031, thereby improving the sealing and structural strength of the connection. A third control valve 703 is provided on the first branch pipe 3021. By adjusting the opening of the third control valve 703, the refrigerant flow rate in the first branch pipe 3021 can be controlled, thereby adjusting the subcooling effect on the refrigerant in the main pipe 701 and optimizing the cooling efficiency of the system.

[0139] Some embodiments of the present invention further include a gas-liquid separation assembly 80, which is disposed between the hot / cold mode switching valve 60 and the compressor return air port 2011. The gas-liquid separation assembly 80 separates the gas-liquid mixture flowing out of the hot / cold mode switching valve 60, ensuring that the gas entering the compressor return air port 2011 is primarily gas, thereby preventing liquid from entering the compressor and causing faults such as liquid hammer.

[0140] In some embodiments of the present invention, the hot and cold mode switching valve 60 includes a switching valve body 601, and a first interface portion 602, a second interface portion 603, a third interface portion 604 and a fourth interface portion 605 provided on the switching valve body 601. The first interface portion 602 is connected to the compressor exhaust port 2012, the second interface portion 603 is connected to the heat source heat exchanger 30, the third interface portion 604 is connected to the compressor return air port 2011, and the fourth interface portion 605 is connected to the second stop valve 50. The switching valve body 601 can selectively switch between the heating mode and the cooling mode. The cooling mode The first interface part 602 is connected to the second interface part 603, and the third interface part 604 is connected to the fourth interface part 605 in heating mode. The first interface part 602 is connected to the fourth interface part 605, and the second interface part 603 is connected to the third interface part 604 in heating mode. The first interface part 602 is arranged at the bottom of the switching valve body 601 and extends downward from the bottom of the switching valve body 601. The second interface part 603, the third interface part 604 and the fourth interface part 605 are arranged side by side at the top of the switching valve body 601 and extend upward from the top of the switching valve body 601.

[0141] By providing a first interface portion 602 at the bottom of the switching valve body 601 and extending downward from the bottom of the switching valve body 601, the switching valve body 601 is directly connected to the compressor exhaust port 2012 of the compressor 20 through the first interface portion 602. Gravity is utilized to ensure that high-pressure refrigerant can smoothly enter the switching valve body 601. The second interface portion 603, the third interface portion 604, and the fourth interface portion 605 are provided side by side at the top of the switching valve body 601 and extend upward from the top of the switching valve body 601. This facilitates the connection of the second interface portion 603, the third interface portion 604, and the fourth interface portion 605 with other components, and can reduce the flow resistance of the refrigerant within the switching valve body 601, thereby allowing the refrigerant to flow efficiently in the system.

[0142] In some embodiments of the present invention, there are two compressors 20 , and the compressor exhaust ports 2012 of the two compressors 20 are connected to the first interface portion 602 via a three-way manifold.

[0143] In the related art, in some large-scale refrigeration systems, such as central air-conditioning systems, industrial refrigeration equipment, etc., the refrigeration capacity of a single compressor 20 may not be able to meet the high load requirements of the system.

[0144] Therefore, in this embodiment, by providing two compressors 20, the two compressors 20 can operate in parallel and share the refrigeration load. This parallel connection method can achieve a greater cooling output and improve the refrigeration capacity of the system. When the system load is low, only one compressor 20 can be operated to avoid unnecessary energy consumption; when the load increases, the second compressor 20 is started to ensure that the system always operates in an efficient state. The dual-compressor 20 system can flexibly adjust the operating state of the compressor 20 according to different working conditions, optimize the compression process, and improve the overall energy efficiency of the system. In addition, the reasonable allocation of the operating time of the two compressors 20 can reduce the continuous operating time of a single compressor 20, thereby extending the service life of the compressor 20. If one of the compressors 20 fails, the other compressor 20 can still continue to work, thereby ensuring the normal operation of the system.

[0145] In some embodiments of the present invention, an oil separation assembly is also included, which includes two oil separators 90. The two oil separators 90 are connected to two compressors 20 one by one, the compressor exhaust pipe 202 is connected to the oil separator 90, and the compressor return pipe 203 is connected to the gas-liquid separator.

[0146] The two oil separators 90 have the same structure, and the structure of one of them will be described below. The oil separator 90 includes an oil separator body 901. An oil inlet pipe 902 is formed on the sidewall of the oil separator body 901, and an oil outlet pipe 903 is formed on the top of the oil separator body 901. The two ends of the oil inlet pipe 902 communicate with the oil separator body 901 and the compressor exhaust pipe 202, respectively. The opening at the end of the oil inlet pipe 902 that connects to the oil separator body 901 is positioned perpendicular to the sidewall of the oil separator body 901. This creates centrifugal motion within the inner cavity of the oil separator body 901, facilitating the separation of oil droplets from the refrigerant gas. The oil outlet pipe 903 communicates with the first interface 602 of the switching valve body 601, facilitating the entry of the separated refrigerant gas into the switching valve body 601 through the first interface 602. An oil return capillary 904 is provided at the bottom of the oil separation body, and a filter assembly 905 is provided on the oil return capillary 904. The filter assembly 905 filters the oil in the oil return capillary 904. The separated oil enters the gas-liquid separator through the oil return capillary 904, and is then sucked into the compressor 20 through the compressor return air pipe 203, thereby replenishing oil to the compressor 20, thereby ensuring the amount of lubricating oil in the compressor 20 and ensuring the normal operation of the compressor 20.

[0147] In some embodiments of the present invention, a pressure relief pipe 906 may also be provided, with both ends of the pressure relief pipe 906 connected to the oil return capillary 904. A pressure relief valve 907 is provided on the pressure relief pipe 906. The pressure relief valve 907 can release some of the pressure when the system pressure is too high, stabilizing pressure fluctuations within the system and helping the lubricating oil to return to the compressor 20 more smoothly through the oil return capillary 904, thereby avoiding poor oil return due to pressure fluctuations. By providing the pressure relief valve 907, it can automatically open when the pressure exceeds the set value, releasing excess pressure through the pressure relief pipe 906, thereby protecting the safe operation of the compressor 20 system.

[0148] Figure 11 This is a structural diagram of a refrigerant circulation system 1000 according to an embodiment of the present invention. Figure 12 and Figure 13 A refrigerant circulation system 1000 is provided in another embodiment of the present invention.

[0149] The third aspect of the present invention proposes a refrigerant circulation system 1000, which includes a heat source side unit 100, a utilization side unit 200, a liquid pipe 300 and a gas pipe 400. The liquid pipe 300 connects the liquid side interface of the heat source side unit 100 and the liquid side interface of the utilization side unit 200, and the gas pipe 400 connects the gas side interface of the heat source side unit 100 and the gas side interface of the utilization side unit 200. The heat source side unit 100 and the utilization side unit 200, the liquid pipe 300 and the gas pipe 400 form a refrigerant circulation loop.

[0150] The utilization side unit 200 includes a utilization side heat exchanger 210, and the switching valve body 601 also has a second interface part 603, a third interface part 604 and a fourth interface part 605. The second interface part 603 is used to communicate with the heat source heat exchanger 30, the third interface part 604 is used to communicate with the gas-liquid separator, and the fourth interface part 605 is used to communicate with the utilization side heat exchanger 210.

[0151] like Figure 11 As shown, the heat source side unit 100 of the refrigerant circulation system 1000 includes a compressor 20 and does not include components such as an oil separation component. For the connection method and working process of each component, please refer to the description of the heat source side unit 100 above.

[0152] like Figure 12 and Figure 13 As shown, the heat source side unit 100 of the refrigerant circulation system 1000 includes a dual compressor 20 structure. Figure 12 and Figure 13 The operation process of the refrigerant circulation system 1000 will be described.

[0153] The refrigerant circulation system 1000 has a cooling mode and a heating mode. Figure 12As shown, in the cooling mode, the compressor 20 compresses the low-temperature, low-pressure gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant and discharges it through the compressor exhaust port 2012. The compressor exhaust port 2012 is connected to the first interface portion 602 of the switching valve body 601. The high-temperature, high-pressure gaseous refrigerant enters the switching valve body 601 through the first interface portion 602 and enters the heat source heat exchanger 30 through the second interface portion 603 of the switching valve body 601. In the heat source heat exchanger 30, the refrigerant releases heat, condenses from gas to liquid, and the heat is discharged to the external environment. The condensed liquid refrigerant flows to the utilization side unit 200 through the liquid pipe 300. It flows into the utilization side heat exchanger 210 through the first connecting main pipe 2 of the valve assembly 10 and becomes a low-temperature, low-pressure refrigerant through each electronic expansion valve 101. The low-temperature, low-pressure liquid refrigerant enters the utilization-side heat exchanger 210, where it absorbs ambient heat and evaporates into gaseous refrigerant. This evaporation process lowers the ambient temperature, thereby achieving a cooling effect. The gaseous refrigerant returns to the heat source-side unit 100 through the gas pipe 400, where it is separated in the gas-liquid separator and enters the compressor return port 2011, beginning the next cycle.

[0154] like Figure 13 As shown, in heating mode, the compressor 20 compresses low-temperature, low-pressure gaseous refrigerant into high-temperature, high-pressure gaseous refrigerant, which is then discharged through the compressor exhaust port 2012. The compressor exhaust port 2012 communicates with the first interface 602 of the switching valve body 601. The high-temperature, high-pressure gaseous refrigerant enters the switching valve body 601 through the first interface 602 and then enters the utilization-side heat exchanger 210 through the fourth interface 605 of the switching valve body 601. In the utilization-side heat exchanger 210, the refrigerant releases heat, condensing from a gaseous state to a liquid state. This heat is then transferred to the indoor environment, achieving a heating effect. The condensed liquid refrigerant returns to the heat source-side unit 100 through the liquid pipe 300. Before the heat source heat exchanger 30, it flows through the second connecting manifold 3 of the valve assembly 10 and becomes low-temperature, low-pressure refrigerant through each electronic expansion valve 101. The low-temperature, low-pressure liquid refrigerant enters the heat source heat exchanger 30, where it absorbs heat from the external environment and evaporates into gaseous refrigerant. The evaporation process lowers the external temperature, transferring the absorbed heat to the indoor environment, thereby achieving a heating effect. The gaseous refrigerant returns to the heat source unit 100 through the gas pipe 400, is separated by the gas-liquid separator, and then enters the compressor return port 2011, beginning the next cycle.

[0155] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A valve assembly, characterized in that: It includes a first connecting main pipe, a second connecting main pipe and a plurality of valve bodies; Each valve body is provided with a first valve connecting pipe and a second valve connecting pipe, and a main valve located between the first valve connecting pipe and the second valve connecting pipe, and the main valve controls the refrigerant flow between the first valve connecting pipe and the second valve connecting pipe; The wall of the first connecting main pipe is provided with a plurality of first connecting holes, and the plurality of first connecting holes are connected to the plurality of first valve connecting pipes in a one-to-one correspondence; The wall of the second connecting main pipe is provided with a plurality of second connecting holes, and the plurality of second connecting holes are connected to the plurality of second valve connecting pipes in a one-to-one correspondence; One axial end of the first connecting manifold is configured as an open end, which is defined as a first open end, and the other axial end of the first connecting manifold is configured as a closed end, which is defined as a first closed end. The first open end is fluidically connected to an external first pipe, and the plurality of first connection holes are closer to the first closed end than to the first open end. Multiple first connection holes are arranged in rows and spaced apart along the axial direction of the first connecting main pipe. The average spacing between the multiple first connection holes is defined as a first spacing, and the spacing between the first closed end and the closest first connection hole is defined as a second spacing, wherein the second spacing is smaller than the first spacing.

2. The valve assembly according to claim 1, wherein One axial end of the second connecting main pipe is configured as an open end, which is defined as the second open end, and the other axial end of the second connecting main pipe is configured as a closed end, which is defined as the second closed end. The second open end fluid is connected to the second external piping, and the plurality of second connection holes are closer to the second closed end than to the second open end.

3. The valve assembly according to claim 2, wherein: The first connecting manifold comprises a first vertical section and a first horizontal section extending from the first vertical section in a bent manner. An end of the first vertical section away from the first horizontal section is configured as the first open end, which is open upward along the axial direction. An end of the first horizontal section away from the first vertical section is configured as the first closed end. A plurality of first connecting holes are provided in the first horizontal section and open upward along the axial direction. and / or, The second connecting main pipe has a second vertical section and a second horizontal section extending from the second vertical section. The end of the second vertical section away from the second horizontal section is configured as the second open end, and the second open end is opened upward along the axial direction. The end of the second horizontal section away from the second vertical section is configured as the second closed end. A plurality of second connecting holes are arranged in the second horizontal section and the plurality of second connecting holes are opened upward along the axial direction.

4. The valve assembly according to claim 3, wherein: The end of the first valve connecting pipe opens downward, and the end of the first valve connecting pipe is connected to the corresponding first connecting hole from top to bottom. The end of the second valve connecting pipe opens downward, and the end of the second valve connecting pipe is connected to the corresponding second connecting hole from top to bottom.

5. The valve assembly according to any one of claims 1 to 4, characterized in that: The first connection hole is formed by integrally flanging the wall of the first connecting main pipe, and the end of the first valve connecting pipe is directly or indirectly welded to the cylindrical inner wall of the first connection hole; and / or, The second connection hole is formed by integrally flanging the wall of the second connecting main pipe, and the end of the first valve connecting pipe is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole.

6. The valve assembly according to any one of claims 1 to 4, characterized in that: The first connecting main pipe, the second connecting main pipe, the first valve connecting pipe and the second valve connecting pipe are all made of a first material, and the first material is any one of stainless steel, copper, copper alloy, aluminum and aluminum alloy.

7. The valve assembly according to claim 6, wherein: The end of the first valve connecting pipe is inserted into the first connecting hole and fixedly welded to the hole wall of the first connecting hole, and the end of the second valve connecting pipe is inserted into the second connecting hole and fixedly welded to the hole wall of the second connecting hole.

8. The valve assembly according to claim 6, wherein: The first material is stainless steel, and the first connecting hole and the second connecting hole both have an inner circumferential surface and an outer circumferential surface, the inner circumferential surface or the outer circumferential surface is connected to a first transition portion, the first valve connecting pipe end and the second valve connecting pipe end are connected to a second transition portion, the first transition portion is sleeved with the second transition portion, the first transition portion is constructed as a copper tube or includes a copper plating, and the second transition portion is constructed as a copper tube or includes a copper plating.

9. The valve assembly according to any one of claims 1 to 4, characterized in that: The first connecting main pipe and the second connecting main pipe are made of a first material, and the first valve connecting pipe and the second valve connecting pipe are made of a second material. The first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy. The second material is one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy and is different from the first material.

10. The valve assembly according to claim 9, wherein The first material is stainless steel, the second material is any one of copper, copper alloy, aluminum, and aluminum alloy, the first connection hole and the second connection hole both have an inner circumferential surface and an outer circumferential surface, the inner circumferential surface or the outer circumferential surface is connected to a first transition portion, and the first transition portion is made of the second material.

11. The valve assembly according to any one of claims 1 to 4, characterized in that: Each of the valve bodies is one or more of an electronic expansion valve, a solenoid valve, and a unloading valve.

12. The valve assembly according to any one of claims 2 to 4, characterized in that: A total-divided-total refrigerant flow path is formed between the first open end and the second open end. The first open end is connected to a first filter, and the second open end is connected to a second filter.

13. A heat source side unit, characterized in that: include: at least one compressor, the compressor compressing a refrigerant and having an exhaust port for discharging the compressed refrigerant; a heat source heat exchanger, wherein the heat source heat exchanger exchanges heat with an external heat source; a first stop valve comprising a first external pipe and a first control valve, wherein the first external pipe forms a liquid side interface of the heat source side unit; a second stop valve, comprising a second external pipe and a second control valve, wherein the second external pipe forms a gas side interface of the heat source side unit; a hot / cold mode switching valve, the hot / cold mode switching valve selectively switching the exhaust port to the heat source heat exchanger or to the second stop valve; The valve assembly according to any one of claims 1 to 12, wherein the valve assembly is provided on a flow path between the first stop valve and the liquid side of the heat source heat exchanger.

14. The heat source side unit according to claim 13, wherein: The subcooling assembly is provided between the valve assembly and the first shut-off valve, the subcooling assembly includes a main circuit and an auxiliary circuit, the refrigerant in the auxiliary circuit subcools the refrigerant in the main circuit, the first connecting manifold of the valve assembly is connected to the liquid side of the heat source heat exchanger, and the second connecting manifold of the valve assembly is connected to the main circuit; A control module is included, and each valve body of the valve assembly is an electronic expansion valve. The control module is communicated with each electronic expansion valve. When the heat source side unit is in cooling mode, the control module controls the opening of each electronic expansion valve according to the actual subcooling degree and the target subcooling degree.

15. The heat source side unit according to claim 14, characterized in that When the actual subcooling degree is less than the target subcooling degree, the control module controls the opening of each electronic expansion valve to increase; when the actual subcooling degree is greater than the target subcooling degree, the control module controls the opening of each electronic expansion valve to decrease; when the actual subcooling degree is equal to the target subcooling degree, the control module controls the opening of each electronic expansion valve to remain unchanged.

16. The heat source side unit according to claim 15, characterized in that The actual subcooling degree is the ambient temperature of the heat source side unit minus the liquid side outlet temperature of the heat source heat exchanger; the target subcooling degree is a preset value.

17. The heat source side unit according to claim 15, characterized in that The first connecting main pipe is provided with a first temperature sensor, which is used to detect the liquid side outlet temperature of the heat source heat exchanger; the windward side of the heat source heat exchanger is provided with a second temperature sensor, which detects the ambient temperature of the heat source side unit.

18. The heat source side unit according to claim 14, characterized in that It also includes liquid side main pipe and liquid side branch pipe. The liquid side main pipe is configured to communicate with the main line and the first stop valve. The liquid side branch pipe includes a first branch pipe and a second branch pipe. The two ends of the auxiliary road are connected to the first branch pipe and the second branch pipe respectively. The first branch pipe diverges from the liquid side main pipe and is connected to one end of the auxiliary road. The second branch pipe is connected from the other end of the auxiliary road to the compressor return port. The first branch pipe has a third control valve, which includes a third valve connecting pipe and a fourth valve connecting pipe. A third connecting hole is opened on the pipe wall of the liquid side main pipe. The third valve connecting pipe is inserted into the third connecting hole, and the fourth valve connecting pipe is connected to one end of the auxiliary line.

19. The heat source side unit according to claim 18, wherein It also includes a gas-liquid separation component, which is arranged between the hot and cold mode switching valve and the compressor return air port.

20. The heat source side unit according to claim 19, wherein The hot and cold mode switching valve includes a switching valve body, and a first interface portion, a second interface portion, a third interface portion and a fourth interface portion provided on the switching valve body, the first interface portion being connected to the compressor exhaust port, the second interface portion being connected to the heat source heat exchanger, the third interface portion being connected to the compressor return air port, and the fourth interface portion being connected to the second stop valve, and the switching valve body can selectively switch between a heating mode and a cooling mode. In the cooling mode, the first interface portion is connected to the second interface portion, and the third interface portion is connected to the fourth interface portion. In the heating mode, the first interface portion is connected to the fourth interface portion, and the second interface portion is connected to the third interface portion. The first interface portion is disposed at the bottom of the switching valve body and extends downward from the bottom of the switching valve body. The second interface portion, the third interface portion, and the fourth interface portion are arranged side by side on the top of the switching valve body, and extend upward from the top of the switching valve body.

21. The heat source side unit according to claim 20, characterized in that: There are two compressors, and the exhaust ports of the two compressors are connected to the first interface portion via a three-way manifold.

22. A refrigerant circulation system, characterized in that: include: The heat source side unit according to any one of claims 13 to 21; at least one utilization side unit; a liquid pipe connecting the liquid side interface of the heat source side unit and the liquid side interface of the utilization side unit; an air pipe connecting the air side interface of the heat source side unit and the air side interface of the utilization side unit; The heat source side unit, the utilization side unit, the liquid pipe, and the gas pipe form a refrigerant circulation circuit.

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