Four-way valve structure, refrigerant circulation loop and heating and ventilation system

Abstract

The invention discloses a four-way valve structure, a refrigerant circulation loop and a heating and ventilation system. The four-way valve structure comprises a valve body, four connector pipes, a matched pipe and an adapter pipe. The valve body is provided with four valve ports; the four connector pipes and the four valve ports are arranged in a one-to-one correspondence mode, the connector pipes are made of stainless steel and comprise first connector ends and second connector ends, and the first connector ends are used for being connected with the valve body; the piping is provided with a first matching end part; the adapter pipe is provided with a first adapter end and a second adapter end, the first adapter end is connected with the second connector end in an inserted mode, the second adapter end is connected with the first matching end in an inserted mode so that the connector pipe can be communicated with the second matching pipe, and the adapter pipe is made of one of copper, copper alloy, aluminum or aluminum alloy. The joint pipe on the valve body is connected with the piping through the adapter pipe made of a specific material, so that stable welding of the valve body and other devices can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning accessories, and in particular to a four-way valve structure, a refrigerant circulation loop and a heating and ventilation system. Background Art

[0002] The refrigerant circulation loop usually includes refrigeration components and a piping system. The refrigeration components are connected by the piping system to form a loop for the circulation and circulation of heat exchange media such as refrigerants. Among them, the four-way valve is a valve used to change the flow direction of the heat exchange medium in the refrigerant circulation loop.

[0003] In the related art, when a four-way valve is welded to components such as an oil separator to assemble the whole machine, it is difficult to place the whole machine in a high-temperature furnace for furnace welding due to its large size. In order to control the cost of raw materials, the joint pipe of the four-way valve is usually made of stainless steel. However, due to the material limitations of the stainless steel pipe, it is difficult to achieve stable welding by manual welding when welding the piping and the joint pipe. Summary of the invention

[0004] The present application provides a four-way valve structure, a refrigerant circulation loop and a HVAC system, in which the joint pipe on the valve body is connected to the piping through a transfer pipe made of a specific material, thereby achieving stable welding of the valve body and other components.

[0005] In a first aspect, the present application provides a four-way valve structure, comprising:

[0006] A valve body having four valve ports;

[0007] Four joint pipes, the four joint pipes are arranged in one-to-one correspondence with the four valve ports, the joint pipes are made of stainless steel, the joint pipes include a first joint end and a second joint end, the first joint end is used to connect with the valve body;

[0008] a pipe having a first fitting end; and

[0009] The adapter tube has a first adapter end and a second adapter end, the first adapter end is plugged into the second joint end, and the second adapter end is plugged into the first matching end to connect the joint pipe and the second matching pipe, and the material of the adapter tube is one of copper, copper alloy, aluminum or aluminum alloy.

[0010] In the second aspect, the present application also provides a refrigerant circulation loop, including an oil separator, a gas-liquid separator, a heat exchanger, a piping assembly and a four-way valve structure; wherein, the inlet valve port among the four valve ports is connected to the oil separator through a piping assembly, the first valve outlet port among the four valve ports is connected to the gas-liquid separator through a piping assembly, the second valve outlet port among the four valve ports is connected to the heat exchanger through a piping assembly, and the third valve outlet port among the four valve ports is connected to the indoor unit through a piping assembly.

[0011] In a third aspect, the present application also provides a HVAC system, including an outdoor unit and an indoor unit, wherein the outdoor unit includes a refrigerant circulation loop.

[0012] The beneficial effects of the present application are as follows: before the whole machine is assembled, the volume of a single device such as the valve body and the oil separator in the refrigerant circulation loop is relatively small. In the present application, when the valve body and the oil separator and other devices are welded through piping, when the material of the piping is copper, copper alloy, aluminum or aluminum alloy, the first adapter end of the adapter tube and the second joint end of the joint tube can be welded by furnace welding or high-frequency welding, and then the second adapter end of the adapter tube can be welded to the first matching end of the piping. Since the welding of copper tubes and copper tubes, copper tubes and aluminum tubes, copper alloys and aluminum tubes, copper alloys and aluminum alloys, and copper alloy tubes and aluminum tubes is more convenient, the second adapter end and the first matching end can be stably welded by manual welding methods such as manual brazing or manual melting welding, so that the connection between the joint tube and the piping can be achieved, so that the joint tube and the piping can be connected. The connection is more convenient and stable; when the material of the piping is stainless steel, the first adapter end of the adapter tube and the second joint end of the joint pipe can be welded by furnace welding or high-frequency welding, and the second adapter end can be welded to the first matching end, and then the first adapter end of the adapter tube and the second adapter end can be stably welded by manual welding methods such as manual brazing or manual melting welding, so as to realize the connection between the joint pipe and the piping; in addition, the two ends of the adapter tube are respectively connected to the second joint end and the first matching end by plugging, so that the two ends of the adapter tube overlap with the second joint end and the first matching end in the radial direction, which can make the thickness of the connection at the two ends of the adapter tube larger, thereby increasing the strength of the connection at the two ends of the adapter tube, thereby improving the connection reliability of the adapter tube, the joint pipe and the piping. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 This is a schematic diagram of the structure of a valve body, a joint pipe and a transfer pipe in one embodiment of the present application;

[0015] Figure 2 This is a schematic diagram of the structure of the joint pipe, the piping and the transfer pipe in one embodiment of the present application;

[0016] Figure 3 This is a schematic diagram of the structure of a joint pipe and a transfer pipe in one embodiment of the present application;

[0017] Figure 4 This is a schematic diagram of the structure of a joint pipe, a pipe and a transfer pipe in another embodiment of the present application;

[0018] Figure 5 This is a schematic diagram of the structure of the transfer tube and the piping in one embodiment of the present application;

[0019] Figure 6 This is a schematic diagram of the structure of the transfer tube and the piping in another embodiment of the present application;

[0020] Figure 7 This is a schematic diagram of the structure of the transfer tube and the piping in another embodiment of the present application;

[0021] Figure 8 This is a schematic diagram of the structure of the transfer tube and the piping in another embodiment of the present application;

[0022] Fig. 9 This is a schematic structural diagram of a joint pipe, a pipe and a transfer pipe in another embodiment of the present application;

[0023] Fig.10 This is a schematic structural diagram of a joint pipe, a pipe and a transfer pipe in another embodiment of the present application;

[0024] Fig.11 This is a schematic diagram of the structure of a joint pipe and a transfer pipe in another embodiment of the present application;

[0025] Fig.12 This is a structural schematic diagram of a joint pipe and a transfer pipe in another embodiment of the present application;

[0026] Fig.13 This is a schematic diagram of the structure of a first joint, a joint pipe, a pipe, a transfer pipe, and a second joint in one embodiment of the present application;

[0027] Fig.14 This is a schematic diagram of the structure of a refrigerant circulation circuit in one embodiment of the present application;

[0028] Fig.15 Schematic diagram of the structure of a HVAC system in one embodiment of the present application.

[0029] Reference numerals:

[0030] 10. Four-way valve structure; 11. Valve body; 111. Valve port; 12. Connector pipe; 121. First connector end; 122. Second connector end; 123. First direct current section; 124. First transition section; 125. Second direct current section; 13. Pipe; 131. First matching end; 132. Second matching end; 133. Third direct current section; 134. Second transition section; 135. Fourth direct current section; 14. Transfer pipe; 141. First transfer end; 142. Second transfer end; 143. Fifth direct current section; 144. The third transition section; 145, the sixth DC section; 146, the first connecting pipe; 146a, the first DC connecting section; 146b, the first transition connecting section; 146c, the second DC connecting section; 147, the second connecting pipe; 147a, the third DC connecting section; 147b, the second transition connecting section; 147c, the fourth DC connecting section; 15, the first joint; 16, the second joint; 17, the welding ring; 20, the outdoor unit; 21, the oil separator; 22, the gas-liquid separator; 23, the heat exchanger; 24, the piping assembly; 30, the indoor unit. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] The present application provides a four-way valve structure, a refrigerant circulation loop and a HVAC system to solve the problem in the related art that when a four-way valve is welded with components such as an oil separator to realize assembly of a whole machine, it is difficult to place the whole machine in a high-temperature furnace for furnace welding due to the large size of the whole machine. In order to control the cost of raw materials, the joint pipe of the four-way valve is usually made of stainless steel. However, due to the material limitation of the stainless steel pipe, it is difficult to achieve stable welding by manual welding when welding the piping and the joint pipe.

[0033] The present application provides a four-way valve structure, a refrigerant circulation loop and a HVAC system to solve the problem in the related art that when a four-way valve is welded with components such as an oil separator to realize assembly of a whole machine, it is difficult to place the whole machine in a high-temperature furnace for furnace welding due to the large size of the whole machine. In order to control the cost of raw materials, the joint pipe of the four-way valve is usually made of stainless steel. However, due to the material limitation of the stainless steel pipe, it is difficult to achieve stable welding by manual welding when welding the piping and the joint pipe.

[0034] In a first aspect, the present application provides a four-way valve structure 10, which is used to change the flow direction of a heat exchange medium in a refrigerant circulation loop, such as Figure 1 and Figure 2 As shown, the four-way valve structure 10 includes a valve body 11 , four joint pipes 12 , a pipe 13 and a transfer pipe 14 .

[0035] Among them, the valve body 11 has four valve ports 111, one valve port 111 of the four valve ports 111 is the inlet valve port 111, and the other three valve ports 111 are all outlet valve ports 111. The specific working principle of the four-way valve has been disclosed in the relevant technology for a long time, and this application will not repeat it; the four connecting pipes 12 are arranged in a one-to-one correspondence with the four valve ports 111, the connecting pipe 12 is made of stainless steel, the connecting pipe 12 includes a first connecting end 121 and a second connecting end 122, and the first connecting end 121 is used to connect with the valve body 11; the piping 13 has a first matching end 131; the adapter pipe 14 has a first adapter end 141 and a second adapter end 142, the first adapter end 141 is plugged into the second connector end 122, and the second adapter end 142 is plugged into the first matching end 131 to connect the connecting pipe 12 with the second piping 13, and the material of the adapter pipe 14 is one of copper, copper alloy, aluminum or aluminum alloy. It can be understood that the four connecting pipes 12 are respectively connected to the four pipes 13 through four transfer pipes 14. The pipes 13 are pipe fittings in the pipe system, so that the valve body 11 can be connected to other devices in the refrigerant circulation circuit through the pipes 13.

[0036] It should be noted that the valve body 11 and the oil separator 21 in the refrigerant circulation circuit are relatively small in size before the whole machine is assembled. In the present application, the valve body 11 and the oil separator 21 (such as Fig.14 ) are welded through the piping 13, when the material of the piping 13 is copper, copper alloy, aluminum or aluminum alloy, the first adapter end 141 of the adapter tube 14 and the second joint end 122 of the joint tube 12 can be welded by furnace welding or high-frequency welding, and then the second adapter end 142 of the adapter tube 14 and the first matching end 131 of the piping 13 are welded. Since the welding of copper tubes, copper tubes and aluminum tubes, copper alloys and aluminum tubes, copper alloys and aluminum alloys, and copper alloy tubes and aluminum tubes is more convenient, the second adapter end 142 and the first matching end 131 can be stably welded by manual welding methods such as manual brazing or manual melting welding, so as to realize the connection between the joint tube 12 and the piping 13, making the connection between the joint tube 12 and the piping 13 more convenient and stable.

[0037] When the material of the pipe 13 is stainless steel, the first transfer end 141 of the transfer pipe 14 can be welded to the second joint end 122 of the joint pipe 12 by furnace welding or high-frequency welding, and the second transfer end 142 can be welded to the first matching end 131, and then the first transfer end 141 of the transfer pipe 14 and the second transfer end 142 can be stably welded by manual welding methods such as manual brazing or manual melting welding, so as to achieve the connection between the joint pipe 12 and the pipe 13. In addition, the two ends of the transfer pipe 14 (i.e., the first transfer end 141 and the second transfer end 142) are respectively connected to the second joint end 122 and the first matching end 131 by plugging, so that the two ends of the transfer pipe 14 overlap with the second joint end 122 and the first matching end 131 in the radial direction, so that the thickness of the two ends of the transfer pipe 14 can be larger, thereby increasing the strength of the two ends of the transfer pipe 14, and further improving the connection reliability of the transfer pipe 14 with the joint pipe 12 and the pipe 13.

[0038] Among them, when the valve body 11 is also made of stainless steel, the first joint end 121 and the valve body 11 can also be welded by a furnace welding process or a high-frequency welding process. In a high-temperature environment, there is hydrogen or hydrogen decomposed from ammonia inside the furnace. Hydrogen is a reducing gas, which can reduce the oxide film on the outside of the steel pipe, which is beneficial to the wetting of the solder and the diffusion of the solder in the stainless steel and copper (or copper alloy, aluminum, aluminum alloy). In addition, the furnace brazing can control the temperature and welding time of different areas of the furnace, and can quickly cool down the sensitized area to prevent the formation of intergranular corrosion, so that the steel pipe and the steel The pipe (or copper pipe, aluminum pipe, etc.) can be brazed in the furnace to ensure the welding stability of the joint pipe 12 and the valve body 11, the adapter pipe 14 and the joint pipe 12, and the pipe 13. The welding temperature parameter of the furnace welding is 800 degrees to 1082 degrees (this temperature is the actual surface temperature of the product to be welded in the furnace). Of course, the welding temperature parameter of the furnace welding can also be selected according to actual needs; if high-frequency welding technology is used for welding, flux can be applied to the welded part before welding. The flux is conducive to solder wetting. Water cooling after high-frequency welding can also prevent the formation of intergranular corrosion. For manual brazing, flame welding or high-frequency welding technology can be selected, and argon arc welding technology can be selected for manual melting welding.

[0039] like Figure 2As shown, in some embodiments, the insertion length of the first transition end 141 and the first joint end 121 is L1, the welding penetration of the first transition end 141 and the first joint end 121 is L2, L1≥10 mm, L1≥L2≥0.8*L1. It can be understood that L1 is the lap length of the first transition end 141 and the first joint end 121, and L2 is the welding length of the first transition end 141 and the first joint end 121. Designing L2 to be long enough can ensure the welding stability of the first transition end 141 and the first joint end 121, and designing L1 to be long enough can ensure that the first transition end 141 and the first joint end 121 can have a sufficient welding length. Among them, L1 can be 10 mm, 15 mm, 20 mm or other values, and L2 can be 0.8 times, 0.85 times, 0.9 times or other multiples of L1.

[0040] In some embodiments, the plug-in length between the second transfer end 142 and the first matching end 131 is L3, 15 mm ≤ L2 ≤ 20 mm, so that the second transfer end 142 and the first matching end 131 have a sufficient overlap length to ensure the welding stability of the second transfer end 142 and the first matching end 131. L3 can be 15 mm, 16 mm, 17.5 mm, 20 mm or other values.

[0041] In some embodiments, Figure 2 As shown, the second connector end 122 is inserted into the first transfer end 141. In other embodiments, as Figure 3 As shown, the first adapter end 141 is inserted into the second connector end 122, thereby realizing the plug-in connection between the first adapter end 141 and the second connector end 122, and the plug-in length of the first adapter end 141 and the second connector end 122 is the length of the overlapping portion of the first adapter end 141 and the second connector end 122.

[0042] In some embodiments, the second connector end 122 overlaps the first connector end 131 in the radial direction (eg, Figure 4 ) or non-overlapping (such as Figure 2 As shown). It can be understood that when the second joint end 122 overlaps with the first matching end 131 in the radial direction, the second joint end 122, the first adapter end 141 and the first matching end 131 overlap in the radial direction, which can make the thickness of the connection of the first adapter end 141 larger, thereby further improving the connection reliability of the adapter tube 14 with the joint pipe 12 and the piping 13, and shortening the length of the whole composed of the joint pipe 12, the piping 13 and the adapter tube 14; when the second joint end 122 does not overlap with the first matching end 131 in the radial direction, Figure 2Taking the example of the second joint end 122 being inserted into the first adapter end 141, and the second adapter end 142 being inserted into the first matching end 131, the first matching end 131 only needs to be large enough to accommodate the second adapter end 142, and the pipe diameter size design of the first matching end 131 does not need to consider the pipe diameter size of the second joint end 122, so that the pipe diameter size of the first matching end 131 can be designed to be smaller, thereby reducing the material used for the first matching end 131 and reducing the production cost.

[0043] In some embodiments, Figure 2 As shown, the joint pipe 12 is a straight pipe, that is, the pipe diameter of the joint pipe 12 is the same at all places, so that the joint pipe 12 does not need to be deformed such as expanding or shrinking, thereby making the manufacture of the joint pipe 12 simpler. Figure 3 and Figure 4 As shown, the joint pipe 12 includes a first DC section 123, a first transition section 124 and a second DC section 125 connected in sequence, the first DC section 123 has a first joint end 121, the second DC section 125 has a second joint end 122, the inner diameter of the first DC section 123 is greater than or less than the inner diameter of the second DC section 125, it can be understood that the inner diameter of the second DC section 125 is different from the inner diameter of the first DC section 123, the first transition section 124 is a diameter-reducing section between the second DC section 125 and the first DC section 123, the first transition section 124 is arranged at an angle to the first DC section 123 and the second DC section 125, the first transition section 124 can be a slope structure or a curved structure, when the inner diameter of the first DC section 123 is greater than the inner diameter of the second DC section 125 (such as Figure 4 ), the inner diameter of the first transition section 124 gradually decreases from the end close to the first direct current section 123 to the end close to the second direct current section 125, and the pipe diameter of the second joint end 122 is smaller, so that the second joint end 122 is more convenient to insert into the first transfer end 141. Of course, the first transfer end 141 can also be inserted into the first transfer end 141 at this time; when the inner diameter of the first direct current section 123 is smaller than the inner diameter of the second direct current section 125, the inner diameter of the first transition section 124 gradually increases from the end close to the first direct current section 123 to the end close to the second direct current section 125, and the inner diameter of the second joint end 122 is larger, so that the first transfer end 141 is more convenient to insert into the second joint end 122. Of course, the second joint end 122 can also be inserted into the first transfer end 141 at this time. Among them, the first direct current section 123, the first transition section 124 and the second direct current section 125 can be manufactured in one piece to reduce the seams on the surface of the joint pipe 12 and improve the overall structural strength of the joint pipe 12.

[0044] In some embodiments, Figure 5 As shown, the second transfer end 142 is inserted into the first matching end 131. In other embodiments, as Figure 6 As shown, the first matching end 131 is inserted into the second adapter end 142, so as to realize the plugging of the second adapter end 142 and the first matching end 131, and the plugging length of the second adapter end 142 and the first matching end 131 is the length of the overlapping part of the second adapter end 142 and the first matching end 131.

[0045] In some embodiments, Figure 5 As shown, the pipe 13 is a straight pipe, that is, the pipe diameters of the pipe 13 are the same at all locations, so that the pipe 13 does not need to be deformed such as expanding or shrinking, thereby making the manufacture of the pipe 13 simpler. Figure 2 and Figure 6 As shown, the pipe 13 includes a third direct current section 133, a second transition section 134 and a fourth direct current section 135 connected in sequence, the third direct current section 133 has a first matching end 131, and the inner diameter of the third direct current section 133 is larger or smaller than the inner diameter of the fourth direct current section 135. It can be understood that the inner diameter of the fourth direct current section 135 is different from the inner diameter of the third direct current section 133, and the second transition section 134 can be a slope structure or a curved surface structure. When the inner diameter of the third direct current section 133 is smaller than the inner diameter of the fourth direct current section 135 (such as Figure 6 ), the inner diameter of the second transition section 134 gradually decreases from the end close to the third direct current section 133 to the end close to the fourth direct current section 135, and the diameter of the first matching end 131 is small, so that the first matching end 131 is more convenient to insert into the second transfer end 142. Of course, the second transfer end 142 can also be inserted into the first matching end 131 at this time; when the inner diameter of the third direct current section 133 is larger than the inner diameter of the fourth direct current section 135 (such as Figure 2 ), the inner diameter of the second transition section 134 gradually increases from the end close to the third direct current section 133 to the end close to the fourth direct current section 135, and the inner diameter of the first matching end 131 is relatively large, so that the second transfer end 142 is more convenient to insert into the first matching end 131. Of course, the first matching end 131 can also be inserted into the second transfer end 142 at this time. Among them, the third direct current section 133, the second transition section 134 and the fourth direct current section 135 can be integrally formed to reduce the seams on the surface of the joint pipe 12 and improve the overall structural strength of the joint pipe 12.

[0046] like Figure 2 as well as Figures 5 to 8As shown, in some embodiments of the present application, the material of the pipe 13 is copper, copper alloy, aluminum or aluminum alloy, and the adapter tube 14 is the same material as the pipe 13 or the material of the main component is the same, that is, the material of the adapter tube 14 is copper, copper alloy, aluminum or aluminum alloy; wherein, the main component of the pipe 13 refers to the material with the largest mass fraction in the material forming the pipe 13, if the material with the largest mass fraction in the material forming the pipe 13 is copper, then the main component of the pipe 13 is copper, and the pipes such as copper pipes and aluminum pipes have good weldability, so that the first connecting end 131 of the pipe 13 and the second connecting end 142 of the adapter tube 14 can be stably welded by manual brazing or manual melting welding. Specifically, when the material of the pipe 13 is copper or copper alloy, the material of the pipe 13 can be deoxidized phosphorus copper, red copper, a copper alloy formed by deoxidized phosphorus copper, or a copper alloy formed by red copper.

[0047] Furthermore, the adapter tube 14 is integrally formed, that is, the adapter tube 14 is an integrally formed pipe, and the first adapter end 141 and the second adapter end 142 of the adapter tube 14 are integrally formed, which can reduce the seams on the surface of the adapter tube 14 and improve the overall structural strength of the adapter tube 14. When welding to form the four-way valve structure 10, the first adapter end 141 of the adapter tube 14 can be first welded by a furnace welding process or a high-frequency welding process, and then the second adapter end 142 of the adapter tube 14 can be welded to the first matching end 131 of the pipe 13 by manual brazing or manual melting welding.

[0048] In some embodiments, the first transfer end 141 and the second joint end 122 are welded by a first solder, and the second transfer end 142 and the first matching end 131 are welded by a second solder, and the melting point of the first solder is greater than the melting point of the second solder. It can be understood that when welding to form the four-way valve structure 10, the first solder can be used to weld the first transfer end 141 and the second joint end 122 first, and then the second solder can be used to weld the second transfer end 142 and the first matching end 131. Since the melting point of the first solder is greater than the melting point of the second solder, when welding the second transfer end 142 and the first matching end 131, the weld formed by the first solder will not melt due to the temperature reaching its melting point. Among them, the first solder can be a copper solder with a higher melting point, and the second solder can be a cheap phosphor copper solder or tin copper solder with a lower melting point.

[0049] In some embodiments, Figure 7 As shown, the transfer tube 14 is a straight tube, that is, the diameter of each part of the transfer tube 14 is the same, so that the transfer tube 14 does not need to be deformed such as expanding or shrinking, thereby making the manufacture of the transfer tube 14 simpler. Figure 5 and Figure 8As shown, the transfer tube 14 includes a fifth DC section 143, a third transition section 144 and a sixth DC section 145 connected in sequence, the fifth DC section 143 has a first transfer end 141, the sixth DC section 145 has a second transfer end 142, and the inner diameter of the fifth DC section 143 is greater than or less than the inner diameter of the sixth DC section 145. It can be understood that the inner diameter of the fifth DC section 143 is different from the inner diameter of the sixth DC section 145, and the third transition section 144 is a diameter-changing section between the fifth DC section 143 and the sixth DC section 145. When the inner diameter of the fifth DC section 143 is greater than the inner diameter of the sixth DC section 145 (such as Figure 8 ), the inner diameter of the third transition section 144 gradually decreases from the end close to the fifth direct current section 143 to the end close to the sixth direct current section 145, and the diameter of the second transfer end 142 is small, so that the second transfer end 142 is more convenient to insert into the first matching end 131. Of course, the first matching end 131 can also be inserted into the second transfer end 142 at this time; when the inner diameter of the fifth direct current section 143 is smaller than the inner diameter of the sixth direct current section 145 (such as Figure 5 ), the inner diameter of the third transition section 144 gradually increases from the end close to the fifth DC section 143 to the end close to the sixth DC section 145, the inner diameter of the first transfer end 141 is smaller, and the inner diameter of the second transfer end 142 is larger, so that it is more convenient for the first transfer end 141 to be inserted into the second connector end 122, and it is more convenient for the first matching end 131 to be inserted into the second transfer end 142. Of course, at this time, the second connector end 122 can also be inserted into the first transfer end 141, and the second transfer end 142 can be inserted into the first matching end 131. Among them, the fifth DC section 143, the third transition section 144 and the sixth DC section 145 can be manufactured in one piece to reduce the seams on the surface of the transfer tube 14 and improve the overall structural strength of the transfer tube 14.

[0050] like Fig. 9 and Fig.10 As shown, in some other embodiments of the present application, the material of the piping 13 is stainless steel. It can be understood that, compared with copper and aluminum materials, the cost of stainless steel is lower, which can effectively reduce the cost of the piping 13. In addition, stainless steel has advantages such as good structural strength and not easy to deform, which can improve the connection stability and vibration stress resistance performance, and the stainless steel material has good corrosion resistance, which can effectively resist the erosion of the heat exchange medium in an environment with frequent heat exchange. Among them, when the piping 13 is made of stainless steel, the stainless steel can be formed by Fe elements, Cr elements and Ni elements. The addition of Cr elements and Ni elements gives the stainless steel a lower pitting corrosion potential, a lower pitting corrosion weight loss and a lower martensitic transformation temperature, making it more difficult for the stainless steel to undergo martensitic phase transformation during processing, thereby achieving stronger pitting corrosion resistance and stress corrosion resistance, and can be directly flame welded without annealing.

[0051] In some embodiments, the adapter tube 14 includes a first connecting tube 146 and a second connecting tube 147, the first end of the first connecting tube 146 is a first adapter end 141, the first end of the second connecting tube 147 is a second adapter end 142, and the second end of the first connecting tube 146 is plugged into the second end of the second connecting tube 147, that is, the adapter tube 14 is formed by splicing the first connecting tube 146 and the second connecting tube 147. When welding to form the four-way valve structure 10, the first connecting tube 146 can be first welded to the joint tube 12 by a furnace welding process or a high-frequency welding process, and the second connecting tube 147 can be welded to the piping 13 by a furnace welding process or a high-frequency welding process, and then the first connecting tube 146 and the second connecting tube 147 are welded by manual brazing or manual melting welding.

[0052] In some embodiments, the first end of the first connecting tube 146 is welded to the second joint end 122 by a third solder, the second end of the first connecting tube 146 is welded to the second end of the second connecting tube 147 by a fourth solder, and the first end of the second connecting tube 147 is welded to the joint of the first piping 13 by a fifth solder, and the melting points of the third solder and the fifth solder are both greater than the melting point of the fourth solder. It can be understood that when welding to form the four-way valve structure 10, the first connecting tube 146 and the joint tube 12 can be welded first by the third solder, and the second connecting tube 147 and the piping 13 can be welded by the fifth solder, and then the first connecting tube 146 and the second connecting tube 147 can be welded by the fourth solder. Since the melting points of the third solder and the fifth solder are greater than the melting point of the fourth solder, when welding the first connecting tube 146 and the second connecting tube 147, the weld formed by the third solder and the fifth solder will not melt due to the temperature reaching the melting point. Among them, the melting point of the third solder can be greater than or equal to the melting point of the fifth solder, the third solder and the fifth solder can be copper solder with a higher melting point, and the fourth solder can be copper solder or cheap and low melting point phosphor copper solder or tin copper solder, etc.

[0053] In some embodiments, Fig.10 As shown, the first connecting tube 146 is a straight tube, that is, the diameter of each part of the first connecting tube 146 is the same, so that the first connecting tube 146 does not need to be deformed such as expanding or shrinking, thereby making the manufacturing of the first connecting tube 146 simpler. Fig. 9As shown, the first connecting pipe 146 includes a first DC connecting section 146a, a first transition connecting section 146b, and a second DC connecting section 146c which are connected in sequence. The first end of the first DC connecting section 146a is the first transition end 141, and the second DC connecting section 146c is plugged with the second end of the second connecting pipe 147. The inner diameter of the first DC connecting section 146a is larger than or smaller than the inner diameter of the second DC connecting section 146c, so that the plugging of the first DC connecting section 146a of the first connecting pipe 146 and the second joint end 122 and the plugging of the second DC connecting section 146c and the second connecting pipe 147 are more convenient. The second DC connecting section 146c can be inserted into the second end of the second connecting pipe 147 (such as Fig.10 ), or the second end of the second connecting pipe 147 may be inserted into the second DC connecting section 146c.

[0054] In some embodiments, Fig.10 As shown, the second connecting tube 147 is a straight tube, that is, the diameter of the second connecting tube 147 is the same at all places, so that the second connecting tube 147 does not need to be deformed such as expanding or shrinking, thereby making the manufacturing of the second connecting tube 147 simpler. Fig. 9 As shown, the second connecting pipe 147 includes a third DC connecting section 147a, a second transition connecting section 147b and a fourth DC connecting section 147c which are connected in sequence. The third DC connecting section 147a is plugged with the second end of the first connecting pipe 146. The fourth DC connecting section 147c has a second transition end 142. The inner diameter of the third DC connecting section 147a is larger than or smaller than the inner diameter of the fourth DC connecting section 147c, so that the plugging of the third DC connecting section 147a of the second connecting pipe 147 with the first connecting pipe 146 and the plugging of the fourth DC connecting section 147c with the pipe 13 are more convenient. The third DC connecting section 147a can be inserted into the second end of the first connecting pipe 146, or the second end of the first connecting pipe 146 can be inserted into the third DC connecting section 147a (as shown in FIG. Fig.10 ).

[0055] In some embodiments, Fig.11 As shown, the solder for welding the first transition end 141 and the second joint end 122 is formed by melting the solder ring 17 built into the first transition end 141 or the second joint end 122. It is understandable that before welding the first transition end 141 and the second joint end 122, the solder ring 17 is first built into the first transition end 141 or the second joint end 122, and then the first transition end 141 and the second joint end 122 are heated. After the solder ring 17 reaches the melting point, it melts to form solder. After the solder cools, the weld formed welds the first transition end 141 and the second joint end 122, making the welding of the first transition end 141 and the second joint end 122 more convenient. In other embodiments, such as Fig.12 As shown, the solder for welding the first transition end 141 and the second joint end 122 can also be formed by melting the solder ring 17 provided at the port of the first transition end 141 or the port of the second joint end 122 .

[0056] In some embodiments, the solder for welding the second transfer end 142 and the first matching end 131 is formed by melting the solder ring 17 built into the second transfer end 142 or the first matching end 131. Fig.12 As shown, the solder for welding the second transition end 142 and the first matching end 131 can also be formed by melting the solder ring 17 disposed at the port of the second transition end 142 or the port of the first matching end 131 .

[0057] In some embodiments, in the radial direction of the first transition end 141, a first radial gap for solder to flow in is provided between the first transition end 141 and the second joint end 122, and the first radial gap can provide flow space for the molten solder, which can increase the spreading length of the solder, and thus can improve the welding effect between the first transition end 141 and the second joint end 122. In some embodiments, in the radial direction of the second transition end 142, a second radial gap for solder to flow in is provided between the second transition end 142 and the first matching end 131, and the second radial gap can also provide flow space for the molten solder.

[0058] In some embodiments, the first transition end 141 or the second joint end 122 is provided with a texture structure located in the first radial gap. The texture structure can be formed on the first transition end 141 or / and the second joint end 122. Taking the first transition end 141 inserted into the second joint end 122 as an example, the texture structure can be formed on the outer peripheral surface of the first transition end 141 or / and the inner wall surface of the second joint end 122. The texture structure can improve the roughness of the connection surface between the first transition end 141 and the second joint end 122, thereby providing a capillary effect for the solder, allowing the solder to flow along the texture structure, thereby further increasing the spreading length of the solder, and further improving the welding effect. Among them, the texture structure can be a structure that can improve the surface roughness, such as a wire drawing structure or a knurling structure.

[0059] In some embodiments, the second transition end portion 142 or the first matching end portion 131 is provided with a texture structure located in the second radial gap.

[0060] like Fig.13As shown, in some embodiments, the four-way valve structure 10 also includes a first joint 15, a first end of the first joint 15 is inserted into the valve port 111 and connected to the valve body 11, and a second end of the first joint 15 is welded to a first joint end 121 of a joint pipe 12. The first joint 15 and the joint pipe 12 are made of the same material or have the same main component, that is, the material or main material of the first joint 15 is stainless steel, and the joint pipe 12 can be welded to the first joint 15 by a furnace welding process or a high-frequency welding process, thereby achieving connection with the valve body 11.

[0061] Among them, the second end of the first joint 15 can be plugged into or docked with the first joint end 121 of the joint pipe 12. The plugging of the second end of the first joint 15 with the first joint end 121 means that the second end of the first joint 15 is inserted into the first joint end 121, or the first joint end 121 is inserted into the second end of the first joint 15. The plug-in welding of the second end of the first joint 15 with the first joint end 121 can be achieved by a furnace welding process or a high-frequency welding process; the docking of the second end of the first joint 15 with the first joint end 121 means that the end face of the second end of the first joint 15 is fitted with the end face of the first joint end 121, and the end face of the second end of the first joint 15 is welded to the gap of the end face of the first joint end 121 by welding. The butt welding of the second end of the first joint 15 with the first joint end 121 can be achieved by a resistance welding process or a manual brazing process or a manual melting welding process.

[0062] In some embodiments, the four-way valve structure 10 also includes a second joint 16, the piping 13 has a second matching end 132, the first end of the second joint 16 is welded to the second matching end 132, so as to achieve connection with devices such as the oil separator 21, and the second joint 16 is made of the same material as the piping 13 or the same material as the main component.

[0063] Among them, the first end of the second joint 16 is plugged or butted with the second matching end 132. When the material of the piping 13 is copper, copper alloy, aluminum or aluminum alloy, manual brazing or manual melting welding can be used to realize the plug-in welding of the first end of the second joint 16 and the second matching end 132, and resistance welding process or manual brazing or manual melting welding process can be used to realize the butt welding of the first end of the second joint 16 and the second matching end 132; when the material of the piping 13 is stainless steel, furnace welding process or high-frequency welding process can be used to realize the plug-in welding of the first end of the second joint 16 and the second matching end 132, and resistance welding process or manual brazing or manual melting welding process can be used to realize the butt welding of the first end of the second joint 16 and the second matching end 132.

[0064] In some embodiments, the axial centerline of the connecting pipe 12, the axial centerline of the piping 13 and the axial centerline of the adapter tube 14 coincide with each other, so that the connecting pipe 12, the piping 13 and the adapter tube 14 can be coaxially arranged, making it easier to connect the two ends of the adapter tube 14 with the connecting pipe 12 and the piping 13.

[0065] In a second aspect, based on the above-mentioned four-way valve structure 10, the present application also provides a refrigerant circulation circuit, such as Fig.14 As shown, the four-way valve structure 10 includes an oil separator 21, a gas-liquid separator 22, a heat exchanger 23, a piping assembly 24 and a four-way valve structure 10 as in any of the above embodiments.

[0066] Among them, the inlet valve port among the four valve ports 111 is connected to the oil separator 21 through the piping assembly 24, the first outlet valve port among the four valve ports 111 is connected to the gas-liquid separator 22 through the piping assembly 24, the second outlet valve port among the four valve ports 111 is connected to the heat exchanger 23 through the piping assembly 24, and the third outlet valve port among the four valve ports 111 is connected to the indoor unit 30 through the piping assembly 24.

[0067] In a third aspect, based on the above-mentioned refrigerant circulation loop, the present application also provides a HVAC system, such as Fig.15 As shown, the HVAC system includes an outdoor unit 20 and an indoor unit 30, and the outdoor unit 20 includes a refrigerant circulation circuit as in any of the above embodiments.

[0068] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A four-way valve structure, characterized in that: include: A valve body having four valve ports; Four joint pipes, the four joint pipes are arranged in one-to-one correspondence with the four valve ports, the joint pipes are made of stainless steel, the joint pipes include a first joint end and a second joint end, the first joint end is used to connect with the valve body; a pipe having a first fitting end; and The adapter tube has a first adapter end and a second adapter end, the first adapter end is plugged into the second joint end, and the second adapter end is plugged into the first matching end to connect the joint pipe and the second matching pipe, and the material of the adapter tube is one of copper, copper alloy, aluminum or aluminum alloy.

2. The four-way valve structure according to claim 1, characterized in that: The second joint end is inserted into the first transition end; or the first transition end is inserted into the second joint end.

3. The four-way valve structure according to claim 1, characterized in that: The second joint end portion overlaps or does not overlap with the first mating end portion in a radial direction.

4. The four-way valve structure according to claim 1, characterized in that: The joint pipe is a straight pipe; or, The joint pipe includes a first DC section, a first transition section, and a second DC section connected in sequence, the first DC section has the first joint end, the second DC section has the second joint end, and the inner diameter of the first DC section is larger than or smaller than the inner diameter of the second DC section.

5. The four-way valve structure according to claim 1, characterized in that: The second transition end is inserted into the first matching end, or the first matching end is inserted into the second transition end.

6. The four-way valve structure according to claim 1, characterized in that: The pipe is a straight pipe; or The pipe includes a third direct current section, a second transition section and a fourth direct current section which are connected in sequence. The third direct current section has the first matching end. The inner diameter of the third direct current section is larger than or smaller than the inner diameter of the fourth direct current section.

7. The four-way valve structure according to claim 1, characterized in that: The material of the pipe is copper, copper alloy, aluminum or aluminum alloy, and the transfer tube is made of the same material as the pipe or has the same main component as the pipe.

8. The four-way valve structure according to claim 7, characterized in that: The transfer tube is integrally formed.

9. The four-way valve structure according to claim 8, characterized in that: The transfer pipe is a straight pipe; or, The transfer tube includes a fifth DC segment, a third transition segment and a sixth DC segment connected in sequence, the fifth DC segment has the first transfer end, the sixth DC segment has the second transfer end, and the inner diameter of the fifth DC segment is greater than or smaller than the inner diameter of the sixth DC segment.

10. The four-way valve structure according to claim 8, characterized in that: The first transition end and the second joint end are welded by a first solder, and the second transition end and the first matching end are welded by a second solder. The melting point of the first solder is greater than the melting point of the second solder.

11. The four-way valve structure according to claim 1, characterized in that: The material of the pipe is stainless steel.

12. The four-way valve structure according to claim 11, characterized in that: The adapter tube includes a first connecting tube and a second connecting tube, the first end of the first connecting tube is the first adapter end, the first end of the second connecting tube is the second adapter end, and the second end of the first connecting tube is plugged into the second end of the second connecting tube.

13. The four-way valve structure according to claim 12, characterized in that: The first connecting pipe is a straight pipe; or, The first connecting pipe includes a first DC connecting section, a first transition connecting section, and a second DC connecting section which are connected in sequence. The first end of the first DC connecting section is the first transfer end. The second DC connecting section is plugged into the second end of the second connecting pipe. The inner diameter of the first DC connecting section is larger than or smaller than the inner diameter of the second DC connecting section.

14. The four-way valve structure according to claim 12, characterized in that: The second connecting pipe is a straight pipe; or, The second connecting pipe includes a third DC connecting section, a second transition connecting section and a fourth DC connecting section which are connected in sequence, the third DC connecting section is plugged into the second end of the first connecting pipe, the fourth DC connecting section has the second transition end, and the inner diameter of the third DC connecting section is larger than or smaller than the inner diameter of the fourth DC connecting section.

15. The four-way valve structure according to claim 12, characterized in that: The first end of the first connecting pipe is welded to the second joint end by a third weld, the second end of the first connecting pipe is welded to the second end of the second connecting pipe by a fourth weld, and the first end of the second connecting pipe is welded to the first pipe joint by a fifth weld; Wherein, the melting point of the third solder and the melting point of the fifth solder are both greater than the melting point of the fourth solder.

16. The four-way valve structure according to claim 1, characterized in that: The solder for welding the first transition end and the second joint end is formed by melting a solder ring built into the first transition end or the second joint end; and / or, The solder for soldering the second transfer end and the first matching end is formed by melting a solder ring built into the second transfer end or the first matching end.

17. The four-way valve structure according to claim 1, characterized in that: In the radial direction of the first transition end, a first radial gap for solder to flow in is provided between the first transition end and the second joint end; and / or, In the radial direction of the second transition end portion, a second radial gap for solder to flow in is provided between the second transition end portion and the first matching end portion.

18. The four-way valve structure according to claim 17, characterized in that: The first adapter end or the second joint end is provided with a texture structure located in the first radial gap; and / or, The second transition end portion or the first matching end portion is provided with a texture structure located in the second radial gap.

19. The four-way valve structure according to claim 1, characterized in that: The first transfer end and the first joint end are welded by a furnace welding process or a high-frequency welding process.

20. The four-way valve structure according to claim 1, characterized in that: The insertion length between the first transition end and the first joint end is L1, the welding penetration between the first transition end and the first joint end is L2, L1≥10 mm, L1≥L2≥0.8*L1.

21. The four-way valve structure according to claim 1, characterized in that: The plug-in length between the second adapter end and the first matching end is L3, 15 mm≤L2≤20 mm.

22. The four-way valve structure according to claim 1, characterized in that: The four-way valve structure also includes: a first joint, wherein a first end of the first joint is inserted into the valve port and connected to the valve body, a second end of the first joint is welded to a first joint end of the joint pipe, and the first joint and the joint pipe are made of the same material or have the same main component; and / or, The second joint, the pipe has a second matching end, the first end of the second joint is welded to the second matching end, and the second joint is made of the same material as the pipe or has the same main component as the pipe.

23. The four-way valve structure according to claim 22, characterized in that: The second end of the first joint is plugged or butted with the first joint end of the joint pipe; and / or, The first end of the second connector is plugged or docked with the second matching end.

24. A refrigerant circulation circuit, characterized in that: It comprises an oil separator, a gas-liquid separator, a heat exchanger, a piping assembly and a four-way valve structure as claimed in claims 1 to 23; Among them, the inlet valve port among the four valve ports is connected to the oil separator through a piping assembly, the first valve outlet port among the four valve ports is connected to the gas-liquid separator through a piping assembly, the second valve outlet port among the four valve ports is connected to the heat exchanger through a piping assembly, and the third valve outlet port among the four valve ports is connected to the indoor unit through a piping assembly.

25. A HVAC system, characterized in that: It comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises the refrigerant circulation circuit as claimed in claim 24.

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