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

Abstract

The utility model 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 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] A refrigerant circulation loop typically consists of refrigeration components and a piping system. The piping system connects the components to form a circuit through which heat exchange media, such as refrigerant, circulates. A four-way valve is a valve used to change the direction of the heat exchange medium in the refrigerant circulation loop.

[0003] In the related art, when welding a four-way valve to components such as an oil separator to assemble the entire machine, due to the large size of the entire machine, it is difficult to place it in a high-temperature furnace for furnace welding. In order to control raw material costs, 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. Utility Model Content

[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 devices.

[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 being arranged in one-to-one correspondence with the four valve ports, the joint pipes being made of stainless steel, the joint pipes comprising a first joint end and a second joint end, the first joint end being used for connecting to the valve body;

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

[0009] A transfer tube having a first transfer end and a second transfer end, wherein the first transfer end is plugged into the second connector end, and the second transfer end is plugged into the first matching end to connect the connector pipe and the matching pipe, wherein the material of the transfer tube is one of copper, copper alloy, aluminum or aluminum alloy.

[0010] On 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: the valve body and oil separator and other components in the refrigerant circulation loop are relatively small in size before the whole machine is assembled. In the present application, when the valve body and oil separator and other components 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 pipe 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 pipe and the piping can be realized, so that the joint pipe and the piping are 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 a furnace welding process or a high-frequency welding process first, and the second adapter end can be welded to the first matching end, and then the first adapter end and the second adapter end of the adapter tube can be stably welded by manual welding methods such as manual brazing or manual fusion welding, so that the connection between the joint pipe and the piping can be achieved; 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, and thus 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 related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. 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 any creative work.

[0014] Figure 1 This is a structural diagram 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 structural diagram of a joint pipe, a piping, and a transfer pipe in one embodiment of the present application;

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

[0017] Figure 4 This is a schematic structural diagram of a joint pipe, a piping, 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 pipe and the piping in one embodiment of the present application;

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

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

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

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

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

[0024] Figure 11 This is a structural diagram of a joint pipe and a transfer pipe in another embodiment of the present application;

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

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

[0027] Figure 14 This is a structural diagram of a refrigerant circulation circuit in one embodiment of the present application;

[0028] Figure 15 This is a structural diagram 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 DC section; 124. First transition section; 125. Second DC section; 13. Piping; 131. First connecting end; 132. Second connecting end; 133. Third DC section; 134. Second transition section; 135. Fourth DC section; 14. Transfer pipe; 141. First transfer end; 142. Second transfer end; 143. Fifth DC section; 144. Third transition section; 145, sixth DC section; 146, first connecting pipe; 146a, first DC connecting section; 146b, first transition connecting section; 146c, second DC connecting section; 147, second connecting pipe; 147a, third DC connecting section; 147b, second transition connecting section; 147c, fourth DC connecting section; 15, first joint; 16, second joint; 17, welding ring; 20, outdoor unit; 21, oil separator; 22, gas-liquid separator; 23, heat exchanger; 24, piping assembly; 30, indoor unit. DETAILED DESCRIPTION

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

[0032] The present application provides a four-way valve structure, a refrigerant circulation loop and a HVAC system to solve the problem in related technologies that when the four-way valve is welded with components such as an oil separator to assemble the entire machine, due to the large size of the entire machine, it is difficult to place the entire machine in a high-temperature furnace for furnace welding. 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.

[0033] The present application provides a four-way valve structure, a refrigerant circulation loop and a HVAC system to solve the problem in related technologies that when the four-way valve is welded with components such as an oil separator to assemble the entire machine, due to the large size of the entire machine, it is difficult to place the entire machine in a high-temperature furnace for furnace welding. 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.

[0034] In a first aspect, the present application provides a four-way valve structure 10, which is used to change the flow direction of the heat exchange medium in the 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 the outlet valve ports 111. The specific working principle of the four-way valve has long been disclosed in the relevant technology and will not be repeated in this application; the four connecting pipes 12 are arranged in a one-to-one correspondence with the four valve ports 111, and 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 and the 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 this application, the valve body 11 and the oil separator 21 (such as Figure 14 ) and other devices 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 a furnace welding process or a high-frequency welding process first, and then the second adapter end 142 of the adapter tube 14 and the first matching end 131 of the piping 13 can be 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 fusion welding, thereby realizing 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 pipe 13 is made of stainless steel, the first adapter end 141 of the adapter tube 14 can be first welded to the second joint end 122 of the joint pipe 12 using a furnace welding process or a high-frequency welding process, and the second adapter end 142 can be welded to the first matching end 131. Subsequently, the first adapter end 141 and the second adapter end 142 of the adapter tube 14 can be stably welded together using manual welding methods such as manual brazing or manual fusion welding to achieve the connection between the joint pipe 12 and the pipe 13. Furthermore, the ends of the adapter tube 14 (i.e., the first adapter end 141 and the second adapter end 142) are connected to the second joint end 122 and the first matching end 131, respectively, by plugging them together. This allows the ends of the adapter tube 14 to radially overlap with the second joint end 122 and the first matching end 131, respectively. This increases the thickness of the connecting portions of the adapter tube 14, thereby increasing the strength of the connecting portions and improving the reliability of the connection between the adapter tube 14, 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 and 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 are welded. Pipes (copper or aluminum, etc.) can be brazed in a furnace to ensure stable welds between the joint pipe 12 and valve body 11, the adapter pipe 14 and joint pipe 12, and the piping 13. The furnace brazing temperature ranges from 800°C to 1082°C (this temperature represents the actual surface temperature of the product being brazed in the furnace). This temperature can also be adjusted based on actual needs. When using high-frequency welding, flux can be applied to the welded areas before welding to facilitate solder wetting. Water cooling after high-frequency welding also prevents intergranular corrosion. For manual brazing, flame or high-frequency welding techniques are available, while argon arc welding is suitable for manual fusion welding.

[0039] like Figure 2As shown, in some embodiments, the insertion length between the first transition end 141 and the first joint end 121 is L1, and the welding depth between the first transition end 141 and the first joint end 121 is L2, where L1 ≥ 10 mm and L1 ≥ L2 ≥ 0.8*L1. It is understood that L1 is the overlap length between the first transition end 141 and the first joint end 121, and L2 is the welding length between the first transition end 141 and the first joint end 121. Designing L2 to be sufficiently long can ensure welding stability between the first transition end 141 and the first joint end 121, and designing L1 to be sufficiently long can ensure sufficient welding length between the first transition end 141 and the first joint end 121. 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 insertion length between the second transition end portion 142 and the first mating end portion 131 is L3, where 15 mm ≤ L2 ≤ 20 mm. This ensures a sufficient overlap between the second transition end portion 142 and the first mating end portion 131 to ensure welding stability between the second transition end portion 142 and the first mating end portion 131. L3 can be 15 mm, 16 mm, 17.5 mm, 20 mm, or other values.

[0041] In some embodiments, as Figure 2 As shown, the second connector end 122 is inserted into the first transition 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. 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 mating end 131 in the radial direction (eg, Figure 4 ) or non-overlapping (e.g. 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 transition end 141 and the first matching end 131 overlap in the radial direction, which can make the thickness of the connection part of the first transition end 141 larger, thereby further improving the connection reliability between the transition tube 14 and the joint pipe 12 and the pipe 13, and shortening the length of the entire body composed of the joint pipe 12, the pipe 13 and the transition 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 connector 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. The pipe diameter size design of the first matching end 131 does not need to consider the pipe diameter size of the second connector 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 production costs.

[0043] In some embodiments, as 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, and the second DC section 125 has a second joint end 122. The inner diameter of the first DC section 123 is larger than or smaller 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 sloped structure or a curved structure. When the inner diameter of the first DC section 123 is larger than the inner diameter of the second DC section 125 (as shown in FIG. 1 ), the first DC section 123 and the second DC section 125 are arranged at an angle. Figure 4 ), the inner diameter of the first transition section 124 gradually decreases from the end close to the first DC section 123 to the end close to the second DC section 125, and the diameter of the second joint end 122 is smaller, making it easier for the second joint end 122 to be inserted into the first adapter end 141. Of course, the first adapter end 141 can also be inserted into the first adapter end 141 at this time; when the inner diameter of the first DC section 123 is smaller than the inner diameter of the second DC section 125, the inner diameter of the first transition section 124 gradually increases from the end close to the first DC section 123 to the end close to the second DC section 125. The inner diameter of the second joint end 122 is larger, making it easier for the first adapter end 141 to be inserted into the second joint end 122. Of course, the second joint end 122 can also be inserted into the first adapter end 141 at this time. Among them, the first DC section 123, the first transition section 124, and the second DC section 125 can be manufactured as a single 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, as Figure 5 As shown, the second transition end portion 142 is inserted into the first matching end portion 131. In other embodiments, as Figure 6 As shown, the first matching end 131 is inserted into the second adapter end 142, thereby realizing the plugging of the second adapter end 142 and the first matching end 131. The plugging length of the second adapter end 142 and the first matching end 131 is the length of the overlapping portion of the second adapter end 142 and the first matching end 131.

[0045] In some embodiments, as 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 connection end 131. 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 is 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. The second transition section 134 can be a sloped structure or a curved 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 (as shown in FIG. 1 ), the inner diameter of the fourth direct current section 135 is smaller than the inner diameter of the third direct current section 133. Figure 6 ), the inner diameter of the second transition section 134 gradually decreases from the end close to the third DC section 133 to the end close to the fourth DC section 135. The diameter of the first matching end 131 is small, making it easier to insert the first matching end 131 into the second adapter end 142. Of course, the second adapter end 142 can also be inserted into the first matching end 131 at this time; when the inner diameter of the third DC section 133 is larger than the inner diameter of the fourth DC section 135 (such as Figure 2 The inner diameter of the second transition section 134 gradually increases from the end closest to the third direct current section 133 to the end closest to the fourth direct current section 135. The larger inner diameter of the first mating end 131 facilitates insertion of the second adapter end 142 into the first mating end 131. Alternatively, the first mating end 131 can be inserted into the second adapter end 142. The third direct current section 133, second transition section 134, and fourth direct current section 135 can be integrally formed to reduce seams on the surface of the joint pipe 12 and enhance 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, a copper alloy, aluminum, or an aluminum alloy, and the adapter tube 14 is the same material as the pipe 13 or has the same primary component as the material of the pipe 13, that is, the material of the adapter tube 14 is copper, a copper alloy, aluminum, or an aluminum alloy. The primary component of the pipe 13 refers to the material with the highest mass fraction among the materials forming the pipe 13. For example, if the material with the highest mass fraction among the materials forming the pipe 13 is copper, then the primary component of the pipe 13 is copper. Copper pipes, aluminum pipes, and other pipes have good weldability, allowing the first adapter end 131 of the pipe 13 to be stably welded to the second adapter end 142 of the adapter tube 14 by manual brazing or manual fusion welding. Specifically, when the material of the pipe 13 is copper or a copper alloy, the material of the pipe 13 can be deoxidized phosphorus copper, red copper, a copper alloy formed from deoxidized phosphorus copper, or a copper alloy formed from 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 fusion welding.

[0048] In some embodiments, the first adapter end 141 and the second joint end 122 are welded by a first solder, and the second adapter 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 is understandable that when welding to form the four-way valve structure 10, the first solder can be used to weld the first adapter end 141 and the second joint end 122 first, and then the second solder can be used to weld the second adapter 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 adapter 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 phosphorus copper solder or tin-copper solder with a lower melting point.

[0049] In some embodiments, as Figure 7 As shown, the transfer tube 14 is a straight tube, that is, the diameter of the transfer tube 14 is the same at all locations, 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 segment 143, a third transition segment 144, and a sixth DC segment 145 connected in sequence. The fifth DC segment 143 has a first transfer end 141, and the sixth DC segment 145 has a second transfer end 142. The inner diameter of the fifth DC segment 143 is larger or smaller than the inner diameter of the sixth DC segment 145. It is understandable that the inner diameter of the fifth DC segment 143 is different from the inner diameter of the sixth DC segment 145. The third transition segment 144 is a diameter-reducing segment between the fifth DC segment 143 and the sixth DC segment 145. When the inner diameter of the fifth DC segment 143 is larger than the inner diameter of the sixth DC segment 145 (as shown in FIG. 1 ), the inner diameter of the sixth DC segment 145 is smaller than the inner diameter of the fifth DC segment 143. Figure 8 ), the inner diameter of the third transition section 144 gradually decreases from the end close to the fifth DC section 143 to the end close to the sixth DC section 145, and the diameter of the second transfer end 142 is smaller, making it easier to insert the second transfer end 142 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 DC section 143 is smaller than the inner diameter of the sixth DC section 145 (such as Figure 5 ), the inner diameter of the third transition section 144 gradually increases from the end closest to the fifth DC section 143 to the end closest to the sixth DC section 145. The inner diameter of the first transfer end 141 is smaller, while the inner diameter of the second transfer end 142 is larger. This makes it easier to insert the first transfer end 141 into the second connector end 122, and the first matching end 131 into the second transfer end 142. Of course, 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. The fifth DC section 143, the third transition section 144, and the sixth DC section 145 can be integrally formed to reduce seams on the surface of the transfer tube 14 and enhance the overall structural strength of the transfer tube 14.

[0050] like Figure 9 and Figure 10 As shown, in some other embodiments of the present application, the material of the piping 13 is stainless steel. It is understandable 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 and other properties. In addition, the stainless steel material has good corrosion resistance and 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, lower pitting corrosion weight loss and 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 transfer tube 14 includes a first connecting tube 146 and a second connecting tube 147, the first end of the first connecting tube 146 is the first transfer end 141, the first end of the second connecting tube 147 is the second transfer 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 transfer 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 using a third solder, the second end of the first connecting tube 146 is welded to the second end of the second connecting tube 147 using a fourth solder, and the first end of the second connecting tube 147 is welded to the first matching end 131 using a fifth solder. The melting points of the third solder and the fifth solder are both greater than the melting point of the fourth solder. It is understood that when welding to form the four-way valve structure 10, the first connecting tube 146 can be welded to the joint tube 12 using the third solder first, and the second connecting tube 147 can be welded to the matching tube 13 using the fifth solder. Subsequently, the first connecting tube 146 and the second connecting tube 147 can be welded using the fourth solder. Since the melting points of the third and fifth solders 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 and fifth solders 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. 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, as Figure 10 As shown, the first connecting tube 146 is a straight tube, that is, the diameter of the first connecting tube 146 is the same at all locations, so that the first connecting tube 146 does not need to be deformed such as expanding or shrinking, thereby making the manufacture of the first connecting tube 146 simpler. Figure 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 connected in sequence. The first end of the first DC connecting section 146a is the first transfer end 141, and the second DC connecting section 146c is plugged into the second end of the second connecting pipe 147. The inner diameter of the first DC connecting section 146a is larger 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 (as shown in FIG. Figure 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, as Figure 10 As shown, the second connecting pipe 147 is a straight pipe, that is, the diameter of the second connecting pipe 147 is the same at all locations, so that the second connecting pipe 147 does not need to be deformed such as expanding or shrinking, thereby making the manufacture of the second connecting pipe 147 simpler. Figure 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 connected in sequence. The third DC connecting section 147a is plugged into 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 or smaller than the inner diameter of the fourth DC connecting section 147c. This makes it easier to plug the third DC connecting section 147a of the second connecting pipe 147 into the first connecting pipe 146 and the fourth DC connecting section 147c into the piping 13. 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. 1 ). Figure 10 ).

[0055] In some embodiments, as Figure 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 will weld 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 Figure 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. Figure 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 provided at the port of the second transition end 142 or the port of the first matching end 131 .

[0057] In some embodiments, a first radial gap for solder flow is provided between the first transition end 141 and the second connector end 122 in a radial direction of the first transition end 141. The first radial gap provides space for the molten solder to flow, thereby increasing the solder's spreading length and, in turn, improving the welding effect between the first transition end 141 and the second connector end 122. In some embodiments, a second radial gap for solder flow is provided between the second transition end 142 and the first mating end 131 in a radial direction of the second transition end 142. The second radial gap also provides space for the molten solder to flow.

[0058] In some embodiments, the first adapter end 141 or the second connector end 122 is provided with a textured structure located in the first radial gap. The textured structure can be formed on the first adapter end 141 and / or the second connector end 122. Taking the insertion of the first adapter end 141 into the second connector end 122 as an example, the textured structure can be formed on the outer peripheral surface of the first adapter end 141 and / or the inner wall surface of the second connector end 122. The textured structure can increase the roughness of the connecting surface between the first adapter end 141 and the second connector end 122, thereby providing a capillary effect for the solder, causing the solder to flow along the textured structure, thereby further increasing the spreading length of the solder and further improving the welding effect. The textured structure can be a structure that can increase surface roughness, such as a brushed structure or a knurled 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 Figure 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 the first joint end 121 of the joint pipe 12. The first joint 15 and the joint pipe 12 are made of the same material or 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 and 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 and 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 and 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 between the end face of the first joint end 121 by welding. The butt welding of the second end of the first joint 15 and 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, thereby achieving 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 into or butted against the second matching end 132. When the material of the piping 13 is copper, copper alloy, aluminum or aluminum alloy, manual brazing or manual fusion welding can be used to achieve the plug-in welding of the first end of the second joint 16 and the second matching end 132, and the resistance welding process or manual brazing or manual fusion welding process can be used to achieve 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 or high-frequency welding can be used to achieve the plug-in welding of the first end of the second joint 16 and the second matching end 132, and the resistance welding process or manual brazing or manual fusion welding process can be used to achieve 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 joint pipe 12, the axial centerline of the piping 13, and the axial centerline of the transfer tube 14 coincide, so that the joint pipe 12, the piping 13, and the transfer tube 14 can be coaxially arranged, making it easier to connect the two ends of the transfer tube 14 with the joint pipe 12 and the piping 13.

[0065] In the second aspect, based on the above-mentioned four-way valve structure 10, the present application also provides a refrigerant circulation circuit, such as Figure 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 the 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 circuit, the present application also provides a HVAC system, such as Figure 15 As shown, the HVAC system includes an outdoor unit 20 and an indoor unit 30. 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 replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection 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 being arranged in one-to-one correspondence with the four valve ports, the joint pipes being made of stainless steel, the joint pipes comprising a first joint end and a second joint end, the first joint end being used for connecting to the valve body; a pipe having a first fitting end; and A transfer tube having a first transfer end and a second transfer end, wherein the first transfer end is plugged into the second connector end, and the second transfer end is plugged into the first matching end to connect the connector pipe and the matching pipe, wherein the material of the transfer 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 and the first mating end portion overlap or do not overlap 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 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 DC section, a second transition section and a fourth DC section connected in sequence. The third DC section has the first matching end. The inner diameter of the third DC section is larger or smaller than the inner diameter of the fourth DC 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 pipe 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 larger 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 transfer tube includes a first connecting tube and a second connecting tube, the first end of the first connecting tube is the first transfer end, the first end of the second connecting tube is the second transfer 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 connected in sequence. The first end of the first DC connecting section is the first adapter 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 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 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. The inner diameter of the third DC connecting section is larger 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 tube is welded to the second joint end by a third solder, the second end of the first connecting tube is welded to the second end of the second connecting tube by a fourth solder, and the first end of the second connecting tube is welded to the first matching end by a fifth solder; 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 soldering 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 portion and the first matching end portion is formed by melting a solder ring built into the second transfer end portion or the first matching end portion.

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 using 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 adapter end and the first joint end is L1, the welding penetration between the first adapter 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 further includes: a first connector, wherein a first end of the first connector is inserted into the valve port and connected to the valve body, a second end of the first connector is welded to a first connector end portion of the connector pipe, and the first connector and the connector 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 portion, the first end of the second joint is welded to the second matching end portion, 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 docked with the first joint end of the joint pipe; and / or, The first end of the second connector is plugged into or docked with the second matching end.

24. A refrigerant circulation circuit, characterized in that: The device comprises an oil separator, a gas-liquid separator, a heat exchanger, a piping assembly, and a four-way valve structure according to any one of 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 outlet valve port among the four valve ports is connected to the gas-liquid separator through a piping assembly, the second outlet valve port among the four valve ports is connected to the heat exchanger through a piping assembly, and the third outlet valve 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 according to claim 24.

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