Valve assembly, heat source side unit and refrigerant circulation system

Abstract

The invention relates to the technical field of heating and ventilation equipment, and discloses a valve assembly, a heat source side unit and a refrigerant circulating system. The valve assembly comprises a first connecting header pipe, a second connecting header pipe and a plurality of valve bodies; a plurality of first connecting holes are formed in the pipe wall of the first connecting main pipe and connected with the first valve connecting pipes in a one-to-one correspondence mode, a plurality of second connecting holes are formed in the pipe wall of the second connecting main pipe and connected with the second valve connecting pipes in a one-to-one correspondence mode, and the first connecting holes are connected with the second valve connecting pipes in a one-to-one correspondence mode. The second connecting holes are connected with the second valve connecting pipes in a one-to-one correspondence mode. The first connecting header pipe and the second connecting header pipe are arranged, the pipe walls of the first connecting header pipe and the second connecting header pipe are provided with the multiple first connecting holes and the multiple second connecting holes correspondingly, the connecting holes are connected with the valve connecting pipes of the valve bodies in a one-to-one correspondence mode, pipeline materials and three-way connectors are reduced, the material cost and the installation cost are reduced, and the installation space is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, ventilation and air conditioning equipment, and particularly to a valve assembly, a heat source side unit and a refrigerant circulation system. Background Art

[0002] In a refrigeration (heating) system, generally components such as a compressor, an electronic expansion valve, an oil separator, a condenser and a refrigeration device are included. Among them, the electronic expansion valve uses an electric signal generated by a regulated parameter to control the voltage or current applied to the expansion valve, thereby achieving the purpose of regulating the liquid supply amount.

[0003] However, when the caliber of the electronic expansion valve cannot meet the flow demand, two or more electronic expansion valves need to be connected in parallel. Usually, two or more electronic expansion valves are connected through a tee pipe. The above connection method will cause an increase in the installation space and requires more installation connecting pipes and tee joints for connection, increasing the cost. Summary of the Invention

[0004] The object of the present invention is to at least solve the problems of an increase in the installation space and an increase in cost caused by using more connecting pipes. This object is achieved by the following technical solutions: A first aspect of the present invention proposes a valve assembly, including a first connection main pipe, a second connection main pipe and a plurality of valve bodies; Each of the valve bodies 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. The main valve controls the refrigerant flow between the first valve connecting pipe and the second valve connecting pipe; A plurality of first connection holes are provided on the pipe wall of the first connection main pipe, and the plurality of first connection holes are respectively connected to the plurality of first valve connecting pipes in a one-to-one correspondence; A plurality of second connection holes are provided on the pipe wall of the second connection main pipe, and the plurality of second connection holes are respectively connected to the plurality of second valve connecting pipes in a one-to-one correspondence.

[0005] By providing the first connection main pipe and the second connection main pipe, the valve assembly of the present invention respectively centrally connects the first valve connecting pipes and the second valve connecting pipes of a plurality of valve bodies, avoiding the complex pipeline layout and numerous connection points in the traditional tee pipe connection method. A plurality of first connection holes and second connection holes are respectively provided on the pipe walls of the first connection main pipe and the second connection main pipe. These connection holes are respectively connected to the valve connecting pipes of the valve bodies in a one-to-one correspondence. The connection method is simple and direct, saving the use of pipeline materials and tee joints, reducing the material cost and installation cost, and at the same time reducing the pipeline length and space occupation required for connection, especially suitable for occasions with limited space, saving the installation space.

[0006] In addition, according to the valve assembly of the present invention, the following additional technical features may also be provided: In some embodiments of the present invention, one axial end of the first connection header is configured as an open end, defined as the first open end, and the other axial end of the first connection header is configured as a closed end, defined as the first closed end. The first open end is in fluid communication with an external first pipe, and the plurality of first connection holes are closer to the first closed end than the first open end; and / or, One axial end of the second connection header is configured as an open end, defined as the second open end, and the other axial end of the second connection header is configured as a closed end, defined as the second closed end. The second open end is in fluid communication with an external second pipe, and the plurality of second connection holes are closer to the second closed end than the second open end.

[0007] In some embodiments of the present invention, the first connection header has a first vertical section and a first horizontal section extending by bending from the first vertical section. One end of the first vertical section away from the first horizontal section is configured as the first open end, and the first open end opens upward along the axis. One end of the first horizontal section away from the first vertical section is configured as the first closed end, and the plurality of first connection holes are provided in the first horizontal section and the plurality of first connection holes open upward along the axis; and / or, The second connection header has a second vertical section and a second horizontal section extending by bending from the second vertical section. One end of the second vertical section away from the second horizontal section is configured as the second open end, and the second open end opens upward along the axis. One end of the second horizontal section away from the second vertical section is configured as the second closed end, and the plurality of second connection holes are provided in the second horizontal section and the plurality of second connection holes open upward along the axis.

[0008] In some embodiments of the present invention, the end of the first valve connection pipe opens downward, and the end of the first valve connection pipe is connected to the corresponding first connection hole from top to bottom. The end of the second valve connection pipe opens downward, and the end of the second valve connection pipe is correspondingly connected to the second connection hole from top to bottom.

[0009] In some embodiments of the present invention, the plurality of first connection holes are arranged at intervals in a row along the axial direction of the first connection header. The average distance between two adjacent first connection holes among the plurality of first connection holes is defined as the first distance, and the distance between the first closed end and the closest first connection hole is defined as the second distance. Among them, the second distance is less than the first distance.

[0010] In some embodiments of the present invention, the first connection hole is formed by integrally flanging from the pipe wall of the first connection header, and the end of the first valve connection pipe is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole; and / or, The second connection hole is integrally flanged from the pipe wall of the second connection main pipe, and the end of the first valve connection pipe is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole.

[0011] In some embodiments of the present invention, the first connection main pipe, the second connection main pipe, the first valve connection pipe, and the second valve connection 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.

[0012] In some embodiments of the present invention, the end of the first valve connection pipe is inserted into the first connection hole and welded and fixed to the hole wall of the first connection hole, and the end of the second valve connection pipe is inserted into the second connection hole and welded and fixed to the hole wall of the second connection hole.

[0013] In some embodiments of the present invention, the first material is stainless steel, and both the first connection hole and the second connection hole have an inner peripheral surface and an outer peripheral surface. A first transition portion is connected to the inner peripheral surface or the outer peripheral surface. A second transition portion is connected to the ends of the first valve connection pipe and the second valve connection pipe. The first transition portion sleeves the second transition portion. The first transition portion is configured as a copper pipe or includes a copper plating layer, and the second transition portion is configured as a copper pipe or includes a copper plating layer.

[0014] In some embodiments of the present invention, the first connection main pipe and the second connection main pipe are made of a first material, and the first valve connection pipe and the second valve connection pipe are made of a second material. The first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy, and the second material is one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy and is different from the first material.

[0015] 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 both the first connection hole and the second connection hole have an inner peripheral surface and an outer peripheral surface. A first transition portion is connected to the inner peripheral surface or the outer peripheral surface, and the first transition portion is made of the second material.

[0016] In some embodiments of the present invention, each of the valve bodies is one or more of an electronic expansion valve, a solenoid valve, and a pressure relief valve.

[0017] In some embodiments of the present invention, a total - branch - total refrigerant flow path is formed between the first opening end and the second opening end. A first filter is connected to the first opening end, and a second filter is connected to the second opening end.

[0018] A second aspect of the present invention provides a heat source side unit, including: At least one compressor that compresses refrigerant and has an exhaust port for discharging the compressed refrigerant; A heat source heat exchanger that exchanges heat with an external heat source; A first shut-off valve, including a first external connection pipe and a first control valve, where the first external connection pipe forms the liquid-side interface of the heat source unit; A second shut-off valve, including a second external connection pipe and a second control valve, where the second external connection pipe forms the gas-side interface of the heat source unit; A cooling and heating mode switching valve that selectively switches the exhaust port to lead to the heat source heat exchanger or to the second shut-off valve; The valve assembly as described in any one of the above, where the valve assembly is arranged on the flow path between the first shut-off valve and the liquid side of the heat source heat exchanger.

[0019] In some embodiments of the present invention, an overcooling assembly is included. The overcooling assembly is arranged between the valve assembly and the first shut-off valve. The overcooling assembly includes a main path and a bypass path. The refrigerant in the bypass path overcools the refrigerant in the main path. The first connection main pipe of the valve assembly communicates with the liquid side of the heat source heat exchanger, and the second connection main pipe communicates with the main path; A control module is included. Each valve body of the valve assembly is an electronic expansion valve. The control module is communicatively connected to each electronic expansion valve. When the heat source unit is in the refrigeration mode, the control module controls the opening degree of each electronic expansion valve according to the actual supercooling degree and the target supercooling degree.

[0020] 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 degree 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 degree 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 degree of each electronic expansion valve to remain unchanged.

[0021] In some embodiments of the present invention, the actual supercooling degree is the ambient temperature of the heat source unit minus the liquid-side outlet temperature of the heat source heat exchanger; the target supercooling degree is a preset value.

[0022] In some embodiments of the present invention, a first temperature sensor is arranged on the first connection main pipe. The first temperature sensor is used to detect the liquid-side outlet temperature of the heat source heat exchanger; a second temperature sensor is arranged on the windward side of the heat source heat exchanger. The second temperature sensor detects the ambient temperature of the heat source unit.

[0023] In some embodiments of the present invention, a liquid-side main pipe and a liquid-side branch pipe are further included, The liquid-side main pipe is configured to communicate with the main path and the first stop valve. The liquid-side branch pipes include a first branch pipe and a second branch pipe. Both ends of the auxiliary path communicate with the first branch pipe and the second branch pipe respectively. The first branch pipe diverges from the liquid-side main pipe and communicates with one end of the auxiliary path. The second branch pipe communicates from the other end of the auxiliary path to the compressor suction port. The first branch pipe is provided with a third control valve. The third control valve includes a third valve connection pipe and a fourth valve connection pipe. A third connection hole is formed in the pipe wall of the liquid-side main pipe. The third valve connection pipe is inserted into the third connection hole. The fourth valve connection pipe communicates with one end of the auxiliary path.

[0024] In some embodiments of the present invention, a gas-liquid separation assembly is further included. The gas-liquid separation assembly is disposed between the cooling and heating mode switching valve and the compressor suction port.

[0025] In some embodiments of the present invention, the cooling and heating 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 communicates with the compressor discharge port. The second interface portion communicates with the heat source heat exchanger. The third interface portion communicates with the compressor suction port. The fourth interface portion communicates with the second stop valve. The switching valve body can be selectively switched between a heating mode and a cooling mode. In the cooling mode, the first interface portion communicates with the second interface portion, and the third interface portion communicates with the fourth interface portion. In the heating mode, the first interface portion communicates with the fourth interface portion, and the second interface portion communicates with 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 at the top of the switching valve body and extend upward from the top of the switching valve body.

[0026] In some embodiments of the present invention, the number of compressors is two. The discharge ports of the two compressors communicate with the first interface portion via a three-way manifold.

[0027] A third aspect of the new type proposes a refrigerant circulation system, including: The heat source side unit as described in any one of the above; 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 gas-side interface of the heat source side unit and the gas-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. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 Schematically shows a schematic structural diagram of a valve assembly according to an embodiment provided by the present invention from a first perspective; Figure 2 For Figure 1 the schematic structural diagram of the valve assembly shown from a second perspective; Figure 3 For Figure 1 a partial structural diagram of the valve assembly shown from a first perspective; Figure 4 Schematically shows a schematic structural diagram of a valve assembly according to an embodiment provided by the present invention; Figure 5 Schematically shows a connection diagram of a first connection main pipe and a first valve connection pipe of a valve assembly according to an embodiment provided by the present invention; Figure 6 Schematically shows a connection diagram of a first connection main pipe and a first valve connection pipe of a valve assembly according to an embodiment provided by the present invention; Figure 7 Schematically shows a connection diagram of a first connection main pipe and a first valve connection pipe of a valve assembly according to an embodiment provided by the present invention; Figure 8 Schematically shows a schematic structural diagram of a valve assembly according to an embodiment provided by the present invention; Figure 9 Schematically shows a schematic structural diagram of a valve assembly according to an embodiment provided by the present invention; Figure 10 Schematically shows a schematic structural diagram of a heat source side unit according to the present invention; Figure 11 Schematically shows a schematic structural diagram of a refrigerant circulation system according to an embodiment provided by the present invention; Figure 12 Schematically shows a refrigerant flow diagram of a refrigerant circulation system according to an embodiment provided by the present invention in a refrigeration mode; Figure 13 Schematically shows a refrigerant flow diagram of a refrigerant circulation system according to the present invention in a heating mode.

[0029] The reference numerals are as follows: 1000, refrigerant circulation system; 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; 10, valve assembly; 101, electronic expansion valve; 102, solenoid valve; 20, compressor; 201, compressor body; 2011, compressor suction port; 2012, compressor discharge port; 202, compressor discharge pipe; 203, compressor suction pipe; 30, heat source heat exchanger; 40, first stop valve; 401, first external connection pipe; 402, first control valve; 50, second stop valve; 501, second external connection pipe; 502, second control valve; 60, cooling and heating mode switching valve; 601, switching valve body; 602, first interface part; 603, second interface part; 604, third interface part; 605, fourth interface part; 70, subcooling assembly; 701, main path; 702, auxiliary path; 703, third control valve; 7031, third valve connection pipe; 7032, fourth valve connection pipe; 80, gas-liquid separation assembly; 90, oil separator; 901, oil separator body; 902, oil inlet pipe; 903, oil outlet pipe; 904, oil return capillary tube; 905, filter assembly; 906, pressure relief pipe; 907, pressure relief valve; 1, valve body; 11, first valve connection pipe; 12, second valve connection pipe; 2, first connection main pipe; 21, first vertical section; 22, first horizontal section; 221, first connection hole; 23, first open end; 24, first closed end; 25, first end cover; 3, second connection main pipe; 31, second vertical section; 32, second horizontal section; 321, second connection hole; 33, second open end; 34, second closed end; 35, second end cover; 41, first transition part; 42, second transition part; 5, first filter; 6, second filter; 7, first temperature sensor. Detailed implementation manners

[0030] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0031] It should be understood that the terms used herein are for the purpose of describing particular example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, 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 particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0032] Although the terms first, second, third, etc. may be used herein 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 may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0033] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inner", "outer", "inner side", "outer side", "below", "beneath", "above", "upper", etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both the above and below orientations.

[0034] In the related art, a refrigeration (heating) system generally includes components such as a compressor, an electronic expansion valve, an oil separator, a condenser, and a refrigeration device. Among them, the electronic expansion valve uses the electrical signal generated by the regulated parameter to control the voltage or current applied to the expansion valve, thereby achieving the purpose of regulating the liquid supply volume.

[0035] However, when the caliber of the electronic expansion valve cannot meet the flow demand, two or more electronic expansion valves need to be connected in parallel. Usually, two or more electronic expansion valves are connected through a tee pipe. This above-mentioned connection method will cause an increase in the installation space, and more installation pipes and tee joints are required for connection, increasing the cost.

[0036] In view of this, the present embodiment provides a valve assembly 10, aiming to reduce the use of pipeline materials and tee joints, reduce costs, and save installation space by providing a first connection main pipe 2 and a second connection main pipe 3, and a plurality of first connection holes 221 and second connection holes are respectively provided on the pipe walls of the two, and these connection holes are respectively and correspondingly connected to the valve connection pipes of each valve body 1, thereby solving the above technical problems.

[0037] As Figures 1 to 9 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 connection main pipe 2, and a second connection main pipe 3. Each valve body 1 is provided with a first valve connection pipe 11 and a second valve connection pipe 12, and a main valve body located between the first valve connection pipe 11 and the second valve connection pipe 12. The main valve body controls the refrigerant flow rate between the first valve connection pipe 11 and the second valve connection pipe 12. The main valve body adjusts the refrigerant flow rate as needed. For example, by rotating or moving the valve core, the cross-sectional area of the refrigerant passage is changed, thereby controlling the flow rate and flow volume of the refrigerant. A plurality of first connection holes 221 are provided on the pipe wall of the first connection main pipe 2, and the plurality of first connection holes 221 are respectively and correspondingly connected to the plurality of first valve connection pipes 11. A plurality of second connection holes 321 are provided on the pipe wall of the second connection main pipe 3, and the plurality of second connection holes 321 are respectively and correspondingly connected to the plurality of second valve connection pipes 12.

[0038] The valve assembly 10 of the present invention sets the first connection main pipe 2 and the second connection main pipe 3, and respectively and centrally connects the first valve connection pipes 11 and the second valve connection pipes 12 of multiple valve bodies 1, avoiding the complex pipeline layout and numerous connection points in the traditional tee connection method. Multiple first connection holes 221 and second connection holes 321 are respectively provided on the pipe walls of the first connection main pipe 2 and the second connection main pipe 3, and these connection holes are connected to the valve connection pipes of the valve body 1 in one-to-one correspondence. The connection method is simple and direct, saving the use of pipeline materials and tee joints, reducing the material cost and installation cost. In addition, compared with the traditional method in which each electronic expansion valve 101 needs to be connected through a separate tee pipe, this method not only occupies a large space, but also requires a large number of connection pipes and tee joints, increasing the cost and installation difficulty. The connection method of the present invention reduces the pipeline length and space occupied required for connection, and is especially suitable for occasions with limited space, saving installation space.

[0039] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, one axial end of the first connection main pipe 2 is configured as an open end, defined as the first open end 23, and the other axial end of the first connection main pipe 2 is configured as a closed end, defined as the first closed end 24. The first open end 23 is in fluid communication with the external first pipe, and multiple first connection holes 221 are closer to the first closed end 24 than the first open end 23; and / or, one axial end of the second connection main pipe 3 is configured as an open end, defined as the second open end 33, and the other axial end of the second connection main pipe 3 is configured as a closed end, defined as the second closed end 34. The second open end 33 is in fluid communication with the external second pipe, and multiple second connection holes 321 are closer to the second closed end 34 than the second open end 33.

[0040] Specifically, the two ends of the first connection header 2 along its own axial direction are respectively a first open end 23 and a first closed end 24. A first end cap 25 is connected to one end of the first connection header 2 far from the first open end 23 to form the first closed end 24. The multiple first connection holes 221 on the first connection header 2 are arranged closer to the first closed end 24 than to the first open end 23. The two ends of the second connection header 3 along its own axial direction are respectively a second open end 33 and a second closed end 34. A second end cap 35 is connected to one end of the second connection header 3 far from the second open end 33 to form the second closed end 34. The multiple second connection holes 321 on the second connection header 3 are arranged closer to the first closed end 24 than to the first open end 23. By arranging the first connection holes 221 at a position close to the first closed end 24 and arranging the second connection holes 321 at a position close to the second closed end 34, the flow path of the refrigerant in the connection header becomes smoother, reducing the swirling and eddy current of the refrigerant in the first connection header 2 and the second connection header 3. As a result, the refrigerant can be more evenly distributed to each valve body 1 through the first connection header 2 and the second connection header 3, reducing the non-uniformity of the local flow rate, improving the performance of the system, and reducing the pressure fluctuation during the flow of the refrigerant, thereby improving the operating stability of the system.

[0041] In some embodiments of the present invention, as Figure 1 and Figure 2 shown, the first connection header 2 has a first vertical section 21 and a first horizontal section 22 bent and extending from the first vertical section 21. The end of the first vertical section 21 is configured as the first open end 23, and the first open end 23 opens upward along the axial direction. The end of the first horizontal section 22 is configured as the first closed end 24, and the first closed end 24 faces horizontally along the axial direction. The multiple first connection holes 221 are arranged on the first horizontal section 22 and the multiple first connection holes 221 open upward along the axial direction; and / or, the second connection header 3 has a second vertical section 31 and a second horizontal section 32 bent and extending from the second vertical section 31. The end of the second vertical section 31 is configured as the second open end 33, and the second open end 33 opens upward along the axial direction. The end of the second horizontal section 32 is configured as the second closed end 34, and the second closed end 34 faces horizontally along the axial direction. The multiple second connection holes 321 are arranged on the second horizontal section 32 and the multiple second connection holes 321 open upward along the axial direction.

[0042] Specifically, the first connecting main pipe 2 includes a first vertical section 21. One end of the first vertical section 21 far from the first horizontal section 22 is a first opening end 23. The first opening end 23 opens upward along the axis. The refrigerant can flow into the first connecting main pipe 2 from above, which is convenient for connecting with external pipes or equipment, and is also beneficial to the inflow of the refrigerant. The first horizontal section 22 is vertically connected to one end of the first vertical section 21 far from the first opening end 23. A plurality of first connection holes 221 are provided on the first horizontal section 22 and open upward along the axis. After the refrigerant flows into the first vertical section 21, it will be distributed to the first valve connection pipes 11 of each valve body 1 through the first connection holes 221 on the first horizontal section 22. The upward opening design facilitates the smooth inflow of the refrigerant into the valve body 1 and can also reduce the retention of the refrigerant in the first connecting main pipe 2.

[0043] The second connecting main pipe 3 includes a second vertical section 31. One end of the second vertical section 31 far from the second horizontal section 32 is a second opening end 33. The second opening end 33 opens upward along the axis. The refrigerant can flow into the second connecting main pipe 3 from above, which is convenient for connecting with external pipes or equipment, and is also beneficial to the inflow of the refrigerant. The second horizontal section 32 is vertically connected to one end of the second vertical section 31 far from the second opening end 33. A plurality of second connection holes 321 are provided on the second horizontal section 32 and open upward along the axis. After the refrigerant flows into the second vertical section 31, it will be distributed to the second valve connection pipes 12 of each valve body 1 through the second connection holes 321 on the second horizontal section 32. The upward opening design facilitates the smooth inflow of the refrigerant into the valve body 1 and can also reduce the retention of the refrigerant in the second connecting main pipe 3.

[0044] In some embodiments of the present invention, as Figure 3 shown, the end of the first valve connection pipe 11 opens downward. The end of the first valve connection pipe 11 is connected to the corresponding first connection hole 221 from top to bottom. The end of the second valve connection pipe 12 opens downward, and the end of the second valve connection pipe 12 is correspondingly connected to the second connection hole 321 from top to bottom.

[0045] Specifically, the end of the first valve connection pipe 11 is designed to open downward, so that after the refrigerant flows into the first valve connection pipe 11 from the first connection hole 221 of the first connecting main pipe 2, the end of the first valve connection pipe 11 is connected to the corresponding first connection 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 connection pipe 11, and can save space at the same time, making the entire valve assembly 10 more compact. The end of the second valve connection pipe 12 is also designed to open downward. The refrigerant will flow downward from the second valve connection pipe 12 into the second connecting main pipe 3. The end of the second valve connection pipe 12 is correspondingly connected to the second connection hole 321 from top to bottom. This connection method ensures that the refrigerant can smoothly flow from the second valve connection pipe 12 into the second connecting main pipe 3, and can save space at the same time, making the entire valve assembly 10 more compact.

[0046] In some embodiments of the present invention, as Figure 4 shown, a plurality of first connection holes 221 are arranged at intervals in a row along the axial direction of the first connection main pipe 2. The average distance between every two adjacent first connection holes 221 is defined as the first distance, and the distance between the first closed end 24 and the nearest first connection hole 221 is defined as the second distance. Among them, the second distance is less than the first distance.

[0047] Specifically, in this embodiment, the number of the first connection holes 221 is two, and the first distance is the distance between the central axes of the two first connection holes 221. The number of the first connection holes 221 can also be three, four, five, etc. The distances between adjacent two first connection holes 221 are L1, L2, L3, etc. respectively. By adding the values of L1, L2, L3, etc. and then dividing by the total number of intervals, the average distance, that is, the first distance, can be obtained. The second distance D is the distance between the end face of the first end cover 25 close to the first horizontal section 22 and the central axis of the first connection hole 221 closest to the first end cover 25. By setting the second distance to be less than the first distance, after the refrigerant enters the first connection main pipe 2, it can be more evenly distributed into each valve body 1, so as to accurately control the refrigerant flow rate and improve the efficiency of the system; furthermore, when there is a gas-liquid two-phase in the refrigerant entering the first connection main pipe 2, setting the second distance D less than the first distance enables the refrigerant to impact the first end cover 25 before flowing into the first valve connection pipe 11, so that the gas-liquid mixture of the refrigerant is more uniform, thereby reducing the noise of the refrigerant passing through the valve assembly 10 and improving the service life of the valve assembly 10.

[0048] In some embodiments of the present invention, as Figure 3 shown, the first connection hole 221 is integrally flanged from the pipe wall of the first connection main pipe 2, and the end of the first valve connection 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 integrally flanged from the pipe wall of the second connection main pipe 3, and the end of the first valve connection pipe 11 is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole 221.

[0049] Specifically, the first connection hole 221 is directly formed from the pipe wall material of the first connection header 2 through a flanging process. The end of the first valve connection pipe 11 can be directly welded to the cylindrical inner wall of the first connection hole 221, or can be welded through an intermediate component (such as a short pipe or a connector). The flanging process can ensure that there is no seam between the first connection hole 221 and the pipe wall of the first connection header 2, thereby improving the sealing performance and structural strength at the connection. The second connection hole 321 is directly formed from the pipe wall material of the second connection header 3 through a flanging process. The end of the second valve connection pipe 12 can be directly welded to the cylindrical inner wall of the second connection hole 321, or can be welded through an intermediate component (such as a short pipe or a connector). The flanging process can ensure that there is no seam between the first connection hole 221 and the pipe wall of the first connection header 2 and between the second connection hole 321 and the pipe wall of the second connection header 3, thereby improving the sealing performance and structural strength at the connection. The first connection hole 221 and the second connection hole 321 formed through the flanging process have cylindrical inner walls, providing a good connection foundation for the connection of the first valve connection pipe 11 and the second valve connection pipe 12, and improving the connection stability and the sealing performance at the connection.

[0050] In some embodiments of the present invention, as Figure 5 shown, the first connection header 2, the second connection header 3, the first valve connection pipe 11, and the second valve connection pipe 12 are all made of a first material, and the first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy.

[0051] The first connection header 2, the second connection header 3, the first valve connection pipe 11, and the second valve connection pipe 12 have the same material, and the material can be stainless steel, copper, copper alloy, aluminum, or aluminum alloy, which can reduce the vibration stress and also have a certain structural strength, preventing being scratched during transportation or use and affecting the service life. For example, the above pipes can all be copper pipes, and the copper pipes have good welding performance, facilitating connection with other pipelines. The above pipes can also all be stainless steel pipes, and the stainless steel pipes have high corrosion resistance and strength.

[0052] In some embodiments of the present invention, the end of the first valve connection pipe 11 is inserted into the first connection hole 221 and welded and fixed to the hole wall of the first connection hole 221, and the end of the second valve connection pipe 12 is inserted into the second connection hole 321 and welded and fixed to the hole wall of the second connection hole 321.

[0053] Exemplarily, the first material is copper. The materials of the first connection header 2 and the first valve connection pipe 11 are both copper. When connecting the two, the first valve connection pipe 11 can be directly welded at the first connection hole 221 to connect the first valve connection pipe 11 and the first connection header 2. It can be understood that when the materials of the second connection header 3 and the second valve connection pipe 12 are both copper, when connecting the two, the second valve connection pipe 12 can be directly welded at the second connection hole 321 to connect the second valve connection pipe 12 and the second connection header 3.

[0054] In some embodiments of the present invention, as Figure 7 shown, the first material is stainless steel, and a first transition portion 41 is connected to the inner peripheral surface or the outer peripheral surface of the first connection hole 221 and the second connection hole 321. A second transition portion 42 is connected to the end of the first valve connection pipe 11 and the second valve connection pipe 12. The first transition portion 41 sleeves the second transition portion 42. The first transition portion 41 is configured as a copper pipe or a copper plating layer, and the second transition portion 42 is configured as a copper pipe or a copper plating layer.

[0055] Specifically, the first connection main pipe 2, the first valve connection pipe 11, the second connection main pipe 3, and the second valve connection pipe 12 are all stainless steel pipes. A copper pipe or a copper plating layer is connected to the inner peripheral surface or the outer peripheral surface of the first connection hole 221. A copper pipe or a copper plating layer is provided at the end of the first valve connection pipe 11. The first valve connection pipe 11 and the first connection main pipe 2 are welded through a copper pipe or a copper plating layer. A copper pipe or a copper plating layer is connected to the inner peripheral surface or the outer peripheral surface of the second connection hole 321. A copper pipe or a copper plating layer is provided at the end of the second valve connection pipe 12. The second valve connection pipe 12 and the second connection main pipe 3 are welded through a copper pipe or a copper plating layer.

[0056] In some embodiments of the present invention, the first connection main pipe 2 and the second connection main pipe 3 are made of a first material, the first valve connection pipe 11 and the second valve connection pipe 12 are made of a second material. The first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy, and the second material is one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy and is different from the first material.

[0057] The first connection main pipe 2 and the second connection main pipe 3 have the same material, and the material can be stainless steel, copper, copper alloy, aluminum, or aluminum alloy. The first valve connection pipe 11 and the second valve connection pipe 12 have the same material, and the material can be stainless steel, copper, copper alloy, aluminum, or aluminum alloy. The material of the first connection main pipe 2 and the second connection main pipe 3 is different from the material of the first valve connection pipe 11 and the second valve connection pipe 12. For example, the first connection main pipe 2 and the second connection main pipe 3 are both stainless steel pipes, and the first valve connection pipe 11 and the second valve connection pipe 12 are both copper pipes, or the first connection main pipe 2 and the second connection main pipe 3 are both copper alloy pipes, and the first valve connection pipe 11 and the second valve connection pipe 12 are both stainless steel pipes.

[0058] 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 a first transition portion 41 is connected to the inner peripheral surface or the outer peripheral surface of the first connection hole 221 and the second connection hole 321. The first transition portion 41 is made of the second material.

[0059] Exemplarily, as Figure 6As shown, when both the first connecting main pipe 2 and the second connecting main pipe 3 are stainless steel pipes, and both 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, a copper sleeve is connected to the inner peripheral surface or the outer peripheral surface of the first connecting hole 221, and the first valve connecting pipe 11 is welded to the first connecting main pipe 2 through the copper sleeve. Similarly, the second valve connecting pipe 12 is a copper pipe, a copper sleeve is connected to the inner peripheral surface or the outer peripheral surface of the second connecting hole 321, and the second valve connecting pipe 12 is welded to the second connecting main pipe 3 through the copper sleeve. By providing a transition part, good welding performance is provided, ensuring firm connection and good sealing between the first valve connecting pipe 11 and the first connecting main pipe 2, and between the second valve connecting pipe 12 and the second connecting main pipe 3, and it can be applicable to the connection of pipelines made of different materials, with strong applicability.

[0060] 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 a unloading valve.

[0061] The number of valve bodies 1 in the valve assembly 10 of the present invention can be two or three, etc. Each valve body 1 can all be electronic expansion valves 101, or all be solenoid valves, or all be unloading valves, or one electronic expansion valve 101 and one solenoid valve can be provided respectively, or three electronic expansion valves 101 or three solenoid valves can be provided, etc.

[0062] In one example, as Figure 8 shown, the valve body 1 is three electronic expansion valves 101, the three electronic expansion valves 101 are connected in parallel with each other, and 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 communicates with the first connecting main pipe 2, and the second valve connecting pipe 12 communicates with the second connecting main pipe 3.

[0063] In one example, as Figure 9 shown, the valve body 1 is three solenoid valves, the three solenoid valves are connected in parallel with each other, and after being connected in parallel, the three solenoid valves communicate with the first connecting main pipe 2 and the second connecting main pipe 3 respectively.

[0064] In some embodiments of the present invention, as Figure 1 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, the second open end 33 is formed on the second connecting main pipe 3, a total - branch - 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 with a first filter 5, and the second open end 33 is connected with a second filter 6.

[0065] Specifically, the refrigerant can enter the first connecting main pipe 2 (total) from the first opening end 23, be distributed to the first valve connecting pipes 11 of each valve body 1 through the first connecting main pipe 2 (sub - distribution), and then after being regulated by the main valve body, converge into the second connecting main pipe 3 through the second valve connecting pipes 12, and finally flow out from the second opening end 33 (total). It can also enter the second connecting main pipe 3 from the second opening end 33 (total), be distributed to the second valve connecting pipes 12 of each valve body 1 through the second connecting main pipe 3 (sub - distribution), and then after being regulated by the main valve body, converge into the first connecting main pipe 2 through the first valve connecting pipes 11, and finally flow out from the first opening end 23 (total).

[0066] A first filter 5 is provided at the first opening end 23. The first filter 5 is used to filter the refrigerant entering the first connecting main pipe 2, remove impurities, particulate matters and possible contaminants in the refrigerant, prevent these impurities from blocking the valve body 1 or affecting the system performance after entering the valve assembly 10, reduce the risk of blockage and wear, and improve the reliability and stability of the system. Similarly, a second filter 6 is provided at the second opening end 33, and the second filter 6 is used to filter the refrigerant entering the second connecting main pipe 3.

[0067] A second aspect of the present invention proposes a heat source side unit 100, as Figure 10 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 above - mentioned valve assembly 10.

[0068] Among them, the compressor 20 compresses the refrigerant, provides the power for the refrigerant cycle, 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 refrigeration mode, the refrigerant absorbs heat in the heat source heat exchanger 30 to achieve refrigeration; 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 connecting pipe 401 and a first control valve 402. The first external connecting pipe 401 forms the liquid - side interface of the heat source 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 connecting pipe 501 and a second control valve 502. The second external connecting pipe 501 forms the gas - side interface of the heat source 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.

[0069] The hot and cold mode switching valve 60 selectively switches the compressor exhaust port 2012 to lead to the heat source heat exchanger 30 or to the second shut-off valve 50. The valve assembly 10 is arranged on the flow path between the first shut-off valve 40 and the liquid side of the heat source heat exchanger 30. In the refrigeration mode, the compressor exhaust port 2012 leads to the heat source heat exchanger 30, and the refrigerant absorbs heat in the heat source heat exchanger 30. In the heating mode, the compressor exhaust port 2012 leads to the second shut-off valve 50, and the refrigerant releases heat in the heat source heat exchanger 30.

[0070] By integrating the compressor 20, the heat source heat exchanger 30, the shut-off valve and the valve assembly 10, the heat source side unit 100 of the present invention can realize the effective circulation of the refrigerant, the flow rate adjustment and the switching of the hot and cold modes, 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.

[0071] In some embodiments of the present invention, there are an overcooling assembly 70 and a control module. The overcooling assembly 70 is arranged between the valve assembly 10 and the first shut-off valve 40. The overcooling assembly 70 includes a main path 701 and a bypass path 702. The refrigerant in the bypass path 702 overcools the refrigerant in the main path 701 to reduce the temperature of the refrigerant in the main path 701, thereby improving the refrigeration efficiency. The first connection main pipe 2 of the valve assembly 10 communicates with the liquid side of the heat source heat exchanger 30, and the second connection main pipe 3 communicates with the main path 701. Each valve body 1 of the valve assembly 10 is an electronic expansion valve 101 for precisely controlling the refrigerant flow rate. The control module is communicatively connected to each electronic expansion valve 101. When the heat source unit is in the refrigeration mode, the control module controls the opening degree of each electronic expansion valve 101 according to the actual supercooling degree and the target supercooling degree.

[0072] In the refrigeration mode, the compressor 20 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant and discharges it through the compressor exhaust port 2012. The hot and cold mode switching valve 60 leads the compressor exhaust port 2012 to the heat source heat exchanger 30, and the high-temperature and high-pressure gaseous refrigerant enters the heat source heat exchanger 30 and absorbs the heat of the external heat source, and the temperature of the refrigerant rises. After the refrigerant flows out from the liquid side of the heat source heat exchanger 30, it enters the main path 701 of the overcooling assembly 70, and the refrigerant in the bypass path 702 cools the refrigerant in the main path 701 through heat exchange to reduce the temperature of the refrigerant in the main path 701. The overcooled refrigerant enters the valve assembly 10 through the first connection main pipe 2 of the valve assembly 10, and the electronic expansion valve 101 adjusts the refrigerant flow rate according to the instruction of the control module. The control module dynamically adjusts the opening degree 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.

[0073] In some embodiments of the present invention, when the actual degree of subcooling is less than the target degree of subcooling, the control module controls the opening degrees of the electronic expansion valves 101 to increase. By increasing the opening degrees of the electronic expansion valves 101, the refrigerant flow rate is increased, so that the refrigerant stays longer during heat exchange, thereby reducing the temperature of the refrigerant, increasing the degree of subcooling, and making it approach the target value.

[0074] When the actual degree of subcooling is greater than the target degree of subcooling, the control module controls the opening degrees of the electronic expansion valves 101 to decrease. By decreasing the opening degrees of the electronic expansion valves 101, the refrigerant flow rate is reduced, so that the refrigerant stays shorter during heat exchange, thereby increasing the temperature of the refrigerant, reducing the degree of subcooling, and making it approach the target value.

[0075] When the actual degree of subcooling is equal to the target degree of subcooling, the control module controls the opening degrees of the electronic expansion valves 101 to remain unchanged. The fact that the actual degree of subcooling is consistent with the target degree of subcooling indicates that the system is operating in the optimal state. Keeping the opening degrees of the electronic expansion valves 101 unchanged can maintain the current refrigerant flow rate and temperature, and ensure the stable operation of the system.

[0076] It should be noted that when adjusting the refrigerant flow rate, the opening degrees of the electronic expansion valves 101 are the same, which can make the refrigerant flow rate more uniform, reduce the pressure fluctuation and temperature change in the system, ensure the uniform distribution of temperature and pressure in the whole system, and thus improve the stability of the system.

[0077] In some embodiments of the present invention, the actual degree of subcooling is the ambient temperature of the heat source unit minus the liquid-side outlet temperature of the heat source heat exchanger 30; the target degree of subcooling is a preset value. Among them, the ambient temperature of the heat source unit is the temperature of the environment where the heat source unit is located, and the ambient temperature of the heat source unit can be measured by an ambient temperature sensor. The refrigerant temperature at the liquid-side outlet of the heat source heat exchanger 30 can be measured by a temperature sensor for measuring the liquid-side outlet temperature of the heat source heat exchanger 30. The target degree of subcooling is a preset value, which is set according to the specific requirements and design parameters of the system.

[0078] In some embodiments of the present invention, a first temperature sensor 7 is provided on the first connecting main pipe 2, and the first temperature sensor 7 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, and the second temperature sensor detects the ambient temperature of the heat source unit.

[0079] The first temperature sensor 7 is installed on the first connecting main pipe 2, and can be arranged close to the liquid-side outlet of the heat source heat exchanger 30, or can be arranged at any position on 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.

[0080] Since the windward side refers to the side of the heat source heat exchanger 30 that is directly exposed to the air flow when it comes into contact with the external environment, setting the second temperature sensor on the windward side of the heat source heat exchanger 30 can quickly respond to changes in the ambient temperature, and the measured temperature can better reflect the true temperature of the environment where the heat source heat exchanger 30 is located, thus ensuring the accuracy of temperature detection.

[0081] In some embodiments of the present invention, it further includes a liquid side main pipe 301 and liquid side branch pipes. The liquid side main pipe 301 is configured to communicate with the main path 701 and the first stop valve 40. The liquid side branch pipes include a first branch pipe 3021 and a second branch pipe 3022. The two ends of the auxiliary path 702 are respectively communicated with the first branch pipe 3021 and the second branch pipe 3022. The first branch pipe 3021 branches from the liquid side main pipe 301 and is communicated with one end of the auxiliary path 702. The second branch pipe 3022 is communicated from the other end of the auxiliary path 702 to the compressor suction port 2011. The first branch pipe 3021 is provided with a third control valve 703. The third control valve 703 includes a third valve connecting pipe 7031 and a fourth valve connecting pipe 7032. A third connection hole 3011 is formed in the pipe wall of the liquid side main pipe 301. The third valve connecting pipe 7031 is inserted into the third connection hole 3011, and the fourth valve connecting pipe 7032 is communicated with one end of the auxiliary path 702.

[0082] The liquid side branch pipes are branch pipes branched from the liquid side main pipe 301 and are used to distribute the liquid to different branches. The first branch pipe 3021 branches from the liquid side main pipe 301 and is communicated with one end of the auxiliary path 702, guiding the liquid in the liquid side main pipe 301 to the auxiliary path 702 and providing liquid input for the auxiliary path 702. The second branch pipe 3022 is communicated from the other end of the auxiliary path 702 to the compressor suction port 2011, transporting the liquid or gas in the auxiliary path 702 to the compressor suction port 2011 to complete the refrigerant return. A third control valve 703 is provided on the first branch pipe 3021. The third control valve 703 includes a third valve connecting pipe 7031 and a fourth valve connecting pipe 7032. Among them, the third valve connecting pipe 7031 is communicated with the liquid side main pipe 301, and the fourth valve connecting pipe 7032 is communicated with the end of the auxiliary path 702 far from the liquid side main pipe 301. Specifically, a third connection hole 3011 is provided on the liquid side main pipe 301. The third connection hole 3011 is directly processed from the pipe wall material of the liquid side main pipe 301 through a flanging process. The end of the third valve connecting pipe 7031 can be directly welded to the cylindrical inner wall of the third connection hole 3011, or can be welded through an intermediate component (such as a short pipe or a connector). The flanging process can ensure that there is no joint between the pipe wall of the third connection hole 3011 and the third valve connecting pipe 7031, thereby improving the sealing performance and structural strength of the connection. A third control valve 703 is provided on the first branch pipe 3021. By adjusting the opening degree of the third control valve 703, the refrigerant flow rate in the first branch pipe 3021 can be controlled, thereby adjusting the subcooling effect of the refrigerant in the main path 701 and optimizing the refrigeration efficiency of the system.

[0083] In some embodiments of the present invention, it further includes a gas-liquid separation component 80, and the gas-liquid separation component 80 is arranged between the cooling and heating mode switching valve 60 and the compressor suction port 2011. The gas-liquid separation component 80 separates the gas-liquid mixture flowing out of the cooling and heating mode switching valve 60 to ensure that mainly gas enters the compressor suction port 2011, and avoid faults such as liquid hammer caused by liquid entering the compressor.

[0084] In some embodiments of the present invention, the cooling and heating 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 arranged on the switching valve body 601. The first interface portion 602 communicates with the compressor discharge port 2012, the second interface portion 603 communicates with the heat source heat exchanger 30, the third interface portion 604 communicates with the compressor suction port 2011, and the fourth interface portion 605 communicates with the second stop valve 50. The switching valve body 601 can be selectively switched between a heating mode and a cooling mode. In the cooling mode, the first interface portion 602 communicates with the second interface portion 603, and the third interface portion 604 communicates with the fourth interface portion 605. In the heating mode, the first interface portion 602 communicates with the fourth interface portion 605, and the second interface portion 603 communicates with the third interface portion 604. The first interface portion 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 portion 603, the third interface portion 604, and the fourth interface portion 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.

[0085] By arranging the first interface portion 602 at the bottom of the switching valve body 601 and the first interface portion 602 extending downward from the bottom of the switching valve body 601, it is convenient for the switching valve body 601 to be directly connected to the compressor discharge port 2012 of the compressor 20 through the first interface portion 602, and by using the gravity effect, it is ensured that the 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 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, which is convenient for the connection of the second interface portion 603, the third interface portion 604, and the fourth interface portion 605 to other components, and can reduce the flow resistance of the refrigerant in the switching valve body 601, so that the refrigerant can flow efficiently in the system.

[0086] In some embodiments of the present invention, the number of compressors 20 is two, and the compressor discharge ports 2012 of the two compressors 20 communicate with the first interface portion 602 through a tee manifold.

[0087] In the related art, in some large 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.

[0088] Therefore, in this embodiment, by setting two compressors 20, the two compressors 20 can operate in parallel and jointly bear the refrigeration load. This parallel connection method can achieve a larger refrigeration capacity 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, by reasonably distributing the operating time of the two compressors 20, the continuous operating time of a single compressor 20 can be reduced, 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.

[0089] In some embodiments of the present invention, it further includes an oil separation assembly. The oil separation assembly includes two oil separators 90. The two oil separators 90 are respectively connected to the two compressors 20 in one-to-one correspondence. The compressor exhaust pipe 202 is communicated with the oil separator 90, and the compressor suction pipe 203 is communicated with the gas-liquid separator.

[0090] The structures of the two oil separators 90 are the same, and the structure of one of the oil separators 90 will be described. The oil separator 90 includes an oil separator body 901. An oil inlet pipe 902 is provided on the side wall of the oil separator body 901. An oil outlet pipe 903 is provided at the top of the oil separator body 901. The two ends of the oil inlet pipe 902 are respectively communicated with the oil separator body 901 and the compressor exhaust pipe 202. The opening of the end of the oil inlet pipe 902 communicated with the oil separator body 901 is perpendicular to the side wall of the oil separator body 901, so that the oil-gas mixed fluid generates a centrifugal motion in the inner cavity of the oil separator body 901, which helps to separate the oil droplets from the gaseous refrigerant. The oil outlet pipe 903 is communicated with the first interface portion 602 of the switching valve body 601, facilitating the separated gaseous refrigerant to enter the switching valve body 601 through the first interface portion 602. An oil return capillary 904 is provided at the bottom of the oil separation body. 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 suction pipe 203, thereby replenishing the oil in the compressor 20, ensuring the lubricating oil amount in the compressor 20, and ensuring the normal operation of the compressor 20.

[0091] In some embodiments of the present invention, a pressure relief pipe 906 may be provided. Both ends of the pressure relief pipe 906 are respectively connected to the oil return capillary 904, and a pressure relief valve 907 is provided on the pressure relief pipe 906. The pressure relief valve 907 can release part of the pressure when the system pressure is too high, stabilize the pressure fluctuation in the system, and help the lubricating oil return to the compressor 20 more smoothly through the oil return capillary 904, avoiding poor oil return caused by pressure fluctuation. By setting the pressure relief valve 907, it can automatically open when the pressure exceeds the set value, and release the excess pressure through the pressure relief pipe 906, thereby protecting the safe operation of the compressor 20 system.

[0092] Figure 11 FIG. is a schematic structural diagram of a refrigerant circulation system 1000 according to an embodiment provided by the present invention. Figure 12 and Figure 13 is a refrigerant circulation system 1000 according to another embodiment provided by the present invention.

[0093] A third aspect of the present invention provides a refrigerant circulation system 1000. The refrigerant circulation system 1000 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, the utilization side unit 200, the liquid pipe 300, and the gas pipe 400 form a refrigerant circulation loop.

[0094] The utilization side unit 200 includes a utilization side heat exchanger 210. The switching valve body 601 further has a second interface portion 603, a third interface portion 604, and a fourth interface portion 605. The second interface portion 603 is used to communicate with the heat source heat exchanger 30, the third interface portion 604 is used to communicate with the gas-liquid separator, and the fourth interface portion 605 is used to communicate with the utilization side heat exchanger 210.

[0095] As Figure 11 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.

[0096] As Figure 12 and Figure 13 shown, the heat source side unit 100 of the refrigerant circulation system 1000 includes a dual-compressor 20 structure. Refer to Figure 12 and Figure 13 for an explanation of the working process of the refrigerant circulation system 1000.

[0097] The refrigerant circulation system 1000 has a refrigeration mode and a heating mode. As Figure 12As shown, in the refrigeration mode, the compressor 20 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, which is discharged through the compressor exhaust port 2012. The compressor exhaust port 2012 is communicated with the first interface portion 602 of the switching valve body 601. The high-temperature and 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 and condenses from the gaseous state to the liquid state, and the heat is discharged to the external environment. The condensed liquid refrigerant flows through the liquid pipe 300 to the utilization side unit 200. It flows in through the first connection main pipe 2 of the valve assembly 10 before the utilization side heat exchanger 210, and becomes a low-temperature and low-pressure refrigerant through each electronic expansion valve 101. The low-temperature and low-pressure liquid refrigerant enters the utilization side heat exchanger 210, absorbs the heat of the surrounding environment in the utilization side heat exchanger 210, and evaporates into a gaseous refrigerant. The evaporation process reduces the temperature of the surrounding environment, thereby achieving the refrigeration effect. The gaseous refrigerant returns to the heat source side unit 100 through the gas pipe 400. After being separated by the gas-liquid separator, it enters the compressor suction port 2011 to start the next cycle.

[0098] As Figure 13 shown, in the heating mode, the compressor 20 compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, which is discharged through the compressor exhaust port 2012. The compressor exhaust port 2012 is communicated with the first interface portion 602 of the switching valve body 601. The high-temperature and high-pressure gaseous refrigerant enters the switching valve body 601 through the first interface portion 602, and the high-temperature and high-pressure gaseous refrigerant enters the utilization side heat exchanger 210 through the fourth interface portion 605 of the switching valve body 601. In the utilization side heat exchanger 210, the refrigerant releases heat and condenses from the gaseous state to the liquid state, and the heat is transferred to the indoor environment to achieve the heating effect. The condensed liquid refrigerant flows through the liquid pipe 300 back to the heat source side unit 100, flows in through the second connection main pipe 3 of the valve assembly 10 before the heat source heat exchanger 30, and becomes a low-temperature and low-pressure refrigerant through each electronic expansion valve 101. The low-temperature and low-pressure liquid refrigerant enters the heat source heat exchanger 30, absorbs the heat of the external environment in the heat source heat exchanger 30, and evaporates into a gaseous refrigerant. The evaporation process reduces the temperature of the external environment, and the absorbed heat is transferred to the indoor environment, thereby achieving the heating effect. The gaseous refrigerant returns to the heat source side unit 100 through the gas pipe 400. After being separated by the gas-liquid separator, it enters the compressor suction port 2011 to start the next cycle.

[0099] As described above, it is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A valve assembly, characterized in that, Comprising a first connecting main pipe, a second connecting main pipe and a plurality of valve bodies; Each of the valve bodies 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; A plurality of first connection holes are provided on the pipe wall of the first connecting main pipe, and the plurality of first connection holes are connected to the plurality of first valve connecting pipes in a one-to-one correspondence; A plurality of second connection holes are provided on the pipe wall of the second connecting main pipe, and the plurality of second connection holes are connected to the plurality of second valve connecting pipes in a one-to-one correspondence.

2. The valve assembly according to claim 1, characterized in that, One end of the first connecting main pipe in the axial direction is configured as an open end, defined as the first open end, and the other end of the first connecting main pipe in the axial direction is configured as a closed end, defined as the first closed end, and the first open end is in fluid communication with an external first pipe, and the plurality of first connection holes are closer to the first closed end than the first open end; and / or, One end of the second connecting main pipe in the axial direction is configured as an open end, defined as the second open end, and the other end of the second connecting main pipe in the axial direction is configured as a closed end, defined as the second closed end, and the second open end is in fluid communication with an external second pipe, and the plurality of second connection holes are closer to the second closed end than the second open end.

3. The valve assembly according to claim 2, wherein The first connecting main pipe has a first vertical section and a first horizontal section bent and extending from the first vertical section, one end of the first vertical section away from the first horizontal section is configured as the first open end, the first open end opens upward along the axis, and one end of the first horizontal section away from the first vertical section is configured as the first closed end, and the plurality of first connection holes are provided on the first horizontal section and the plurality of first connection holes open upward along the axis; and / or, The second connecting main pipe has a second vertical section and a second horizontal section bent and extending from the second vertical section, one end of the second vertical section away from the second horizontal section is configured as the second open end, the second open end opens upward along the axis, and one end of the second horizontal section away from the second vertical section is configured as the second closed end, and the plurality of second connection holes are provided on the second horizontal section and the plurality of second connection holes open upward along the axis.

4. The valve assembly according to claim 3, characterized in that, 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 connection 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 correspondingly connected to the second connection hole from top to bottom.

5. The valve assembly according to claim 2, characterized in that, The plurality of first connection holes are arranged at intervals in a row along the axial direction of the first connecting main pipe, the average distance between two adjacent first connection holes is defined as the first distance, and the distance between the first closed end and the nearest first connection hole is defined as the second distance, wherein, the second distance is less than the first distance.

6. The valve assembly according to any one of claims 1-5, characterized in that, The first connection hole is formed by integrally flanging from the pipe wall of the first 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; and / or, The second connection hole is integrally flanged from the tube wall of the second connection header, and the end of the first valve connection pipe is directly or indirectly welded and fixed to the cylindrical inner wall of the first connection hole.

7. The valve assembly according to any one of claims 1-5, characterized in that, The first connection header, the second connection header, the first valve connection pipe, and the second valve connection 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.

8. The valve assembly according to claim 7, wherein, The end of the first valve connection pipe is inserted into the first connection hole and welded and fixed to the hole wall of the first connection hole, and the end of the second valve connection pipe is inserted into the second connection hole and welded and fixed to the hole wall of the second connection hole.

9. The valve assembly according to claim 7, characterized in that, 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. A first transition portion is connected to the inner circumferential surface or the outer circumferential surface. A second transition portion is connected to the ends of the first valve connection pipe and the second valve connection pipe. The first transition portion sleevingly engages the second transition portion. The first transition portion is configured as a copper pipe or includes a copper plating layer, and the second transition portion is configured as a copper pipe or includes a copper plating layer.

10. The valve assembly according to any one of claims 1-5, characterized in that, The first connection header and the second connection header are made of a first material, and the first valve connection pipe and the second valve connection pipe are made of a second material. The first material is any one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy, and the second material is one of stainless steel, copper, copper alloy, aluminum, and aluminum alloy and is different from the first material.

11. The valve assembly according to claim 10, wherein, The first material is stainless steel, and 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. A first transition portion is connected to the inner circumferential surface or the outer circumferential surface, and the first transition portion is made of the second material.

12. The valve assembly according to any one of claims 1-5, characterized in that, Each of the valve bodies is one or more of an electronic expansion valve, a solenoid valve, and a unloading valve.

13. The valve assembly according to any one of claims 2-5, characterized in that, A total - branch - total refrigerant flow path is formed between the first opening end and the second opening end. A first filter is connected to the first opening end, and a second filter is connected to the second opening end.

14. A heat source side unit, characterized in that, Comprising: At least one compressor that compresses refrigerant and has an exhaust port for discharging the compressed refrigerant; A heat source heat exchanger that exchanges heat with an external heat source; A first stop valve including a first external connection pipe and a first control valve, and the first external connection pipe forms a liquid - side interface of the heat source side unit; A second stop valve including a second external connection pipe and a second control valve, and the second external connection pipe forms a gas - side interface of the heat source side unit; A cooling - heating mode switching valve that selectively switches the exhaust port to lead to the heat source heat exchanger or to the second stop valve; The valve assembly according to any one of claims 1 to 13, and the valve assembly is disposed on the flow path between the first stop valve and the liquid side of the heat source heat exchanger.

15. The heat source side unit according to claim 14, characterized in that, It includes a subcooling component, which is arranged between the valve component and the first stop valve. The subcooling component includes a main path and a bypass path, and the refrigerant in the bypass path subcools the refrigerant in the main path. The first connection main pipe of the valve component is communicated with the liquid side of the heat source heat exchanger, and the second connection main pipe of the valve component is communicated with the main path; It includes a control module. Each valve body of the valve component is an electronic expansion valve, and the control module is communicatively connected with each electronic expansion valve. When the heat source unit is in the refrigeration mode, the control module controls the opening degree of each electronic expansion valve according to the actual subcooling degree and the target subcooling degree.

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

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

18. The heat source side unit according to claim 16, wherein A first temperature sensor is arranged on the first connection main pipe, and the first temperature sensor is used to detect the liquid side outlet temperature of the heat source heat exchanger; a second temperature sensor is arranged on the windward side of the heat source heat exchanger, and the second temperature sensor detects the ambient temperature of the heat source unit.

19. The heat source side unit according to claim 15, characterized in that It further includes a liquid side main pipe and a liquid side branch pipe, The liquid side main pipe is configured to be communicated with the main path and the first stop valve, The liquid side branch pipe includes a first branch pipe and a second branch pipe. Both ends of the bypass path are respectively communicated with the first branch pipe and the second branch pipe. The first branch pipe branches from the liquid side main pipe and is communicated with one end of the bypass path, and the second branch pipe is communicated from the other end of the bypass path to the compressor suction port, The first branch pipe is provided with a third control valve. The third control valve includes a third valve connection pipe and a fourth valve connection pipe. A third connection hole is opened on the pipe wall of the liquid side main pipe, and the third valve connection pipe is inserted into the third connection hole, and the fourth valve connection pipe is communicated with one end of the bypass path.

20. The heat source side unit according to claim 19, wherein It further includes a gas-liquid separation component, which is arranged between the cooling and heating mode switching valve and the compressor suction port.

21. The heat source side unit according to claim 20, characterized in that, The cooling and heating mode switching valve includes a switching valve body, and a first interface part, a second interface part, a third interface part and a fourth interface part arranged on the switching valve body. The first interface part is communicated with the compressor discharge port, the second interface part is communicated with the heat source heat exchanger, the third interface part is communicated with the compressor suction port, and the fourth interface part is communicated with the second stop valve. The switching valve body can be selectively switched between the heating mode and the refrigeration mode. In the refrigeration mode, the first interface part is communicated with the second interface part, and the third interface part and the fourth interface part are communicated. In the heating mode, the first interface part is communicated with the fourth interface part, and the second interface part is communicated with the third interface part, The first interface part is arranged 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.

22. The heat source side unit according to claim 21, wherein There are two compressors, and the exhaust ports of the two compressors are connected to the first interface portion through a three-way manifold.

23. A refrigerant circulation system, characterized in that, Comprising: A heat source side unit according to any one of claims 14 to 22; 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; A gas pipe connecting the gas side interface of the heat source side unit and the gas 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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