Check valve assembly

Abstract

The utility model provides a check valve assembly which comprises a valve body, a valve rod and a valve rod. The valve seat is arranged in the valve cavity, a circulation hole is formed in the valve seat, and the circulation hole communicates with the valve cavity; the valve element is arranged in the valve cavity, a sealing face is arranged on the valve element, and the valve element can move relative to the valve seat so that the sealing face can abut against or leave the valve seat; the welding ring is arranged in the valve cavity, the valve seat is sleeved with the welding ring, and when the welding ring is melted, the welding ring flows between the valve seat and the inner wall of the valve body. The check valve assembly solves the technical problems that in the prior art, a check valve is high in cost and cannot meet and adapt to new welding process requirements.

Description

Technical Field

[0001] This utility model relates to the technical field of check valve components, specifically to a check valve component. Background Technology

[0002] The continuous implementation of dual-carbon policies in recent years has prompted air conditioning, valves, pipes, and materials to evolve towards low-carbon emission and low-energy consumption materials. Consequently, stainless steel has become one of the mainstream preferred materials, and stainless steel pipe fittings and valves are constantly being developed. Among them, check valves, as automatic control valves for backflow prevention, are indispensable in air conditioning and refrigeration systems. However, the external connecting pipes of check valve products currently on the market are mainly made of copper, which no longer meets the requirements for low carbon and low energy consumption.

[0003] Currently available air conditioner check valves on the market include... Figure 1 As shown, the design includes an existing connecting pipe 101 for easy welding by the customer, an existing valve seat 102 for backflow prevention, an existing valve core 103 as a movable seal, and an existing stopper 104 for stopping the existing valve core 103. For ease of welding, the existing connecting pipe 101 is typically made of copper, and the seal between the existing valve seat 102 and the existing connecting pipe 101 is achieved through a compression seal using a deformed copper tube. The existing valve core 103 is generally made of nylon, and the existing stopper 104 is connected via a hole drilled in the existing valve seat 102.

[0004] Therefore, the main problems with air conditioner check valves currently on the market are as follows:

[0005] 1. Because the connecting pipe is made of non-ferrous metal copper, the cost of check valve products has increased and their competitiveness has decreased as the price of electrolytic copper has soared.

[0006] 2. Because the pipeline uses non-ferrous metal copper, electrolytic copper has high energy consumption, and carbon tax leads to increased costs, which is not conducive to sustainable development.

[0007] 3. Because the valve core is made of nylon, and nylon is heat-resistant to temperatures below 120℃, as check valve manufacturers gradually use stainless steel pipe fittings, the valve fittings need to be welded together with the valve core in the tunnel furnace. Therefore, the existing valve fittings and valve cores cannot be matched with the client's process.

[0008] Therefore, existing technologies need further development. Utility Model Content

[0009] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide a check valve assembly to solve the technical problems of high cost and inability to meet the requirements of new welding processes in related technologies.

[0010] To achieve the above technical purpose, the utility model takes the following technical scheme: provide a check valve assembly, include: valve body, be provided with valve cavity in valve body inside, valve seat, valve seat set up in valve cavity, open flow through hole on valve seat, flow through hole with valve cavity intercommunication, valve core, valve core set up in valve cavity, be provided with sealing surface on valve core, valve core can move relative to valve seat, with sealing surface abuts or leave valve seat, welding ring, welding ring set up in valve cavity, welding ring is set on valve seat, when welding ring melts flow to between valve seat and valve body inner wall.

[0011] Further, the outer surface of the valve seat is provided with a welding ring groove, the welding ring groove is located away from the valve core side of the valve seat, and the welding ring groove contains the welding ring.

[0012] Further, the outer surface of the valve seat is provided with a material accumulation groove, the material accumulation groove is arranged apart from the welding ring groove, and the material accumulation groove is located on the side of the welding ring groove close to the valve core.

[0013] Further, the valve body includes a limiting structure, the limiting structure is protrudingly arranged on the inner wall of the valve body, and the limiting structure is located on the side of the valve core away from the valve seat.

[0014] Further, the sealing surface includes: a first sealing surface, the first sealing surface is located on the end of the valve core close to the valve seat, the first sealing surface is perpendicular to the axis of the valve body, and the first sealing surface is arranged abuttingly with the valve seat.

[0015] Further, the sealing surface includes: a second sealing surface, the second sealing surface is located on the side of the valve core close to the valve seat, a preset included angle is arranged between the extension direction of the second sealing surface and the axis of the valve body, the second sealing surface is arranged abuttingly with a sealing part located on the valve seat, and the shape of the sealing part is matched with the second sealing surface.

[0016] Further, a first weight-reducing groove is arranged on the end of the valve core close to the valve seat, the first weight-reducing groove is recessed on the valve core, and the first sealing surface is uniformly distributed around the axis of the first weight-reducing groove.

[0017] Further, the check valve assembly includes a guide wing, the guide wing is located on the side of the valve core away from the valve seat, one end of the guide wing is connected with the valve core, the other end of the guide wing extends towards the direction close to the inner wall of the valve body, the guide wing includes at least two, and the at least two guide wings are distributed apart around the axis of the valve body.

[0018] Further, the guide wing includes a connecting part, the connecting part is connected with the end of the guide wing close to the inner wall of the valve body, the shape of the connecting part is matched with the shape of the inner wall of the valve body, and the outer surface of the connecting part is arranged abuttingly with the inner wall of the valve body.

[0019] Further, the valve core comprises a valve core seat, a sealing surface is arranged on the valve core seat, an installation rod is arranged on one end of the valve core seat close to the valve seat, and the installation rod is protrudingly arranged on the surface of the valve core seat; a guide seat is arranged on the guide seat, at least two guide wings are arranged on the guide seat, a positioning hole for accommodating the installation rod is arranged on the guide seat, and the positioning hole is fixedly connected or detachably connected with the installation rod.

[0020] Beneficial effects:

[0021] 1. The check valve assembly in the embodiment simplifies the structure of the check valve, is easier to assemble, is easier to install, can be made of metal materials such as stainless steel which is resistant to high temperature and has low cost and energy consumption, can be welded as a whole, meets the new welding process requirements, reduces the product cost and energy consumption of the check valve, and solves the technical problems of high cost and inability to meet the new welding process requirements in the related art.

[0022] 2. The limiting groove is formed on the outer surface of the valve body, and a protrusion is formed on the inner wall of the valve body, that is, a limiting structure is formed, the valve core is limited, two advantages are achieved at one time, no additional blocking piece is needed, the manufacturing process and structure are simpler, and the manufacturing cost of the check valve is reduced.

[0023] 3. The guide wing is arranged, the other end of the guide wing extends towards the direction close to the inner wall of the valve body, the valve core is guided during movement, and the valve core is prevented from tilting and inclining to cause the check valve to fail to perform the check work.

[0024] 4. In the check valve assembly in the embodiment, the check valve assembly is integrated in the valve body, the limiting structure of the valve core is limited by the change in the caliber of the valve body, the valve body shell, the blocking piece and other structures are reduced, the structure and assembly steps are simpler, the valve core and the valve seat can be made of stainless steel metal pieces, the check valve can be welded at high temperature, the new welding process requirements are met, and the product reliability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structure diagram of a check valve assembly in the prior art;

[0026] Figure 2 is a structure diagram of a check valve assembly in the prior art;

[0027] Figure 3 is a structure diagram of a check valve assembly in the prior art;

[0028] Figure 4 is a structure diagram of a check valve assembly in the prior art;

[0029] Figure 5 is a structure schematic view of the valve seat of the check valve assembly adopted by the embodiment of the utility model.

[0030] Figure 6 is a structure schematic view of the valve core of the check valve assembly adopted by the embodiment of the utility model.

[0031] Figure 7 is a structure schematic view of the first embodiment of the valve core seat of the check valve assembly adopted by the embodiment of the utility model.

[0032] Figure 8 is a structure schematic view of the second embodiment of the valve core seat of the check valve assembly adopted by the embodiment of the utility model.

[0033] Figure 9 is a structure schematic view of the third embodiment of the valve core seat of the check valve assembly adopted by the embodiment of the utility model.

[0034] Figure 10 is a front view of the first embodiment of the guide seat of the check valve assembly adopted by the embodiment of the utility model.

[0035] Figure 11 is a perspective view of the first embodiment of the guide seat of the check valve assembly adopted by the embodiment of the utility model.

[0036] Figure 12 is a front view of the second embodiment of the guide seat of the check valve assembly adopted by the embodiment of the utility model.

[0037] Figure 13 is a perspective view of the second embodiment of the guide seat of the check valve assembly adopted by the embodiment of the utility model.

[0038] Figure 14 is a front view of the third embodiment of the guide seat of the check valve assembly adopted by the embodiment of the utility model.

[0039] Figure 15 is a perspective view of the third embodiment of the guide seat of the check valve assembly adopted by the embodiment of the utility model.

[0040] Among them, the above-mentioned drawing includes the following drawing marks:

[0041] 101, the existing connecting pipe; 102, the existing valve seat; 103, the existing valve core; 104, the existing blocking piece;

[0042] 1, valve body; 11, mounting hole; 2, valve seat; 21, flow hole; 22, welding ring groove; 23, material accumulation groove; 24, sealing part; 3, valve core; 31, valve core seat; 311, mounting rod; 32, guide seat; 321, positioning hole; 4, welding ring; 5, limiting structure; 61, first sealing surface; 62, second sealing surface; 71, first weight reduction groove; 72, second weight reduction groove; 8, guide wing; 81, connecting part; 91, limiting groove; 92, horn mouth. DETAILED DESCRIPTION

[0043] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0044] According to the utility model embodiments, a check valve assembly is provided, please refer to Figures 1 to 15 , including: valve body 1, the inside of valve body 1 is provided with valve cavity;Valve seat 2, valve seat 2 is arranged in valve cavity, and flow hole 21 is formed in valve seat 2, and flow hole 21 is communicated with valve cavity;Valve core 3, valve core 3 is arranged in valve cavity, and sealing surface is arranged on valve core 3, and valve core 3 can be moved relative to valve seat 2 to make sealing surface abut or leave valve seat 2;Welding ring 4, welding ring 4 is arranged in valve cavity, and welding ring 4 is sleeved on valve seat 2, and when welding ring 4 melts, it flows between valve seat 2 and the inner wall of valve body 1.

[0045] By introducing the assembly structure in the embodiment, the material of the valve body 1, the valve seat 2 and the like can be more flexibly selected. For example, materials such as stainless steel that are more in line with low carbon emission and low energy consumption requirements can be selected, rather than using all red copper, thereby reducing the overall cost and improving the competitiveness of the product.

[0046] Preferably, the valve body 1, the valve seat 2 and the valve core 3 are all made of stainless steel material, which is resistant to high temperature and has low cost and low energy consumption. Part of the valve body 1, the valve seat 2 and the valve core 3 can also be made of stainless steel material, and the remaining part can be made of other metal or non-metal material according to the process requirements of the client.

[0047] In this way, the valve seat 2 and the valve core 3 are integrated inside the valve body 1, and after the assembly of the check valve assembly is completed, the whole enters the tunnel furnace for welding. After the welding ring 4 melts, the solder thereof is in a fluid state and can flow. The solder flows between the valve seat 2 and the inner wall of the valve body 1, so that the valve seat 2 and the valve body 1 become an integral whole. In this way, the whole check valve assembly can be subjected to high-temperature welding together, thereby meeting the new welding process requirements.

[0048] The check valve assembly in the embodiment simplifies the structure of the check valve, makes the assembly process simpler and the installation more convenient, and the valve body 1, the valve seat 2 and the valve core 3 can be made of a metal material such as stainless steel that is resistant to high temperature and has low cost and energy consumption, so that the check valve assembly as a whole can be welded at high temperature, meeting the new welding process requirements, reducing the product cost and energy consumption of the check valve, and solving the technical problems of high cost and inability to meet the new welding process requirements in the related art.

[0049] In the check valve assembly in the embodiment, referring to Figure 2 and 5 , a welding ring groove 22 is formed on the outer surface of the valve seat 2, the welding ring groove 22 is located on the side of the valve seat 2 away from the valve core 3, and the welding ring groove 22 contains a welding ring 4. In this way, the welding ring groove 22 is arranged to accommodate the welding ring 4, so that the position of the welding ring is relatively fixed during welding, and the solder can be accumulated and stacked between the inner wall of the valve body 1 and the valve seat 2 during welding, thereby enhancing the welding quality.

[0050] In the check valve assembly in the embodiment, referring to Figure 2 and 5 , a material accumulation groove 23 is formed on the outer surface of the valve seat 2, the material accumulation groove 23 is arranged separately from the welding ring groove 22, and the material accumulation groove 23 is located on the side of the welding ring groove 22 close to the valve core 3. In this way, the excess solder flowing after melting is accumulated in the material accumulation groove 23, avoiding flowing to the valve core 3 and causing the valve core 3 to be welded.

[0051] In the check valve assembly in the embodiment, referring to Figure 2 , the valve body 1 includes a limiting structure 5, the limiting structure 5 is protrudingly arranged on the inner wall of the valve body 1, and the limiting structure 5 is located on the side of the valve core 3 away from the valve seat 2. In this way, the valve core 3 is located between the limiting structure 5 and the valve seat 2, thereby limiting the valve core 3. By arranging the limiting structure 5, the limiting is realized by changing the caliber of the valve body 1, reducing the application of structures such as valve body shell and blocking piece, and achieving the limiting effect of the valve core 3 without the blocking piece, so that the structure is simpler and the assembly process is simpler.

[0052] Specifically, the valve body 1 is provided with a limiting groove 91 and a horn mouth 92, the limiting groove 91 is recessedly arranged on the outer surface of the valve body 1 and used for limiting on the client device or pipeline, and the horn mouth 92 is used for accumulating solder during client assembly, facilitating the assembly of the check valve.

[0053] In some embodiments, the valve body 1 is provided with a limiting groove 91 on the outer surface, and a protrusion is formed on the inner wall of the valve body 1, that is, a limiting structure 5 is formed, thereby limiting the valve core 3, achieving two purposes at one time, and without the need for additional blocking pieces, the manufacturing process and structure are simpler, and the manufacturing cost of the check valve is reduced.

[0054] In the check valve assembly of the embodiment, referring to Figures 7-9 The sealing surface includes a first sealing surface 61 located at one end of the valve core 3 close to the valve seat 2, the first sealing surface 61 being perpendicular to the axis of the valve body 1, and the first sealing surface 61 being arranged abuttingly with the valve seat 2. In this way, by arranging the first sealing surface 61, the first sealing surface 61 can abut with the end surface of the valve seat 2, thereby achieving sealing and achieving the function of cutting off.

[0055] In the check valve assembly of the embodiment, referring to Figures 7-9 The sealing surface includes a second sealing surface 62 located at one side of the valve core 3 close to the valve seat 2, the extension direction of the second sealing surface 62 being arranged at a preset angle with the axis of the valve body 1, the second sealing surface 62 being arranged abuttingly with a sealing portion 24 on the valve seat 2, and the sealing portion 24 being shaped to be matched with the second sealing surface 62. In this way, by arranging the second sealing surface 62, the first sealing surface 61 can abut with the sealing portion 24 of the valve seat 2, thereby achieving sealing and achieving the function of cutting off.

[0056] Specifically, the sealing portion 24 is located at one end of the flow-through hole 21 close to the valve core 3, and the sealing portion 24 can be a bevel or a curved surface, and both can play a sealing role in cooperation with the second sealing surface 62.

[0057] Specifically, the second sealing surface 62 is an annular surface, and the second sealing surface 62 is arranged obliquely on the valve core 3, and the distance between the second sealing surface 62 and the axis of the valve body 1 gradually decreases along the direction close to the valve seat 2, on the one hand, facilitating the valve core 3 to slide into the flow-through hole 21 during the process that the valve core 3 approaches the valve seat 2 due to liquid pressure, and on the other hand, keeping the second sealing surface 62 abutting with the sealing portion 24 to achieve the sealing function.

[0058] In some embodiments, the valve core 3 can be designed with both the first sealing surface 61 and the second sealing surface 62, further guaranteeing the sealing performance of the check valve.

[0059] In the check valve assembly of the embodiment, referring to Figure 7 or Figure 8 A first weight-reducing groove 71 is arranged at one end of the valve core 3 close to the valve seat 2, the first weight-reducing groove 71 being recessed on the valve core 3, and the first sealing surface 61 being uniformly distributed around the axis of the first weight-reducing groove 71.

[0060] Specifically, by setting the first weight-reducing groove 71, the overall weight of the valve core 3 can be reduced, so that the valve core can move faster under the driving of the liquid pressure, so that the valve core 3 abuts against or leaves the valve seat 2, and the working efficiency of the check valve assembly is improved.

[0061] In some embodiments, the size of the first weight-reducing groove 71 can be adjusted according to the weight of the valve core, for example, in Figure 7 and Figure 8 , two different sizes of the first weight-reducing groove 71 are respectively shown.

[0062] It can be understood that the first weight-reducing groove 71 can adopt any one of a V-shaped groove, a cylindrical groove, etc.

[0063] In some embodiments, the first weight-reducing groove 71 is provided on the end of the valve core 3 close to the valve seat 2, the first weight-reducing groove 71 is recessed on the valve core 3, and the first sealing surface 61 is uniformly distributed around the axis of the first weight-reducing groove 71.

[0064] In the check valve assembly of the present embodiment, referring to Figure 9 , the second weight-reducing groove 72 is provided on the side of the valve core seat 31 away from the valve seat 2, the second weight-reducing groove 72 is recessed on the valve core seat 31, and the mounting rod 311 is centrally arranged in the second weight-reducing groove 72. By setting the second weight-reducing groove 72, the overall weight of the valve core 3 can be reduced, so that the valve core can move faster under the driving of the liquid pressure, so that the valve core 3 abuts against or leaves the valve seat 2, and the working efficiency of the check valve assembly is improved.

[0065] In the check valve assembly of the present embodiment, referring to Figures 10-15 , the check valve assembly comprises a guide wing 8, the guide wing 8 is located on the side of the valve core 3 away from the valve seat 2, one end of the guide wing 8 is connected with the valve core 3, and the other end of the guide wing 8 extends towards the direction close to the inner wall of the valve body 1, the guide wing 8 comprises at least two, and the at least two guide wings 8 are spaced apart around the axis of the valve body 1. By setting the guide wing 8, the other end of the guide wing 8 extends towards the direction close to the inner wall of the valve body 1, so that the valve core 3 is guided during movement, and the valve core 3 is prevented from tilting or inclining to cause the valve core 3 to fail to perform check work.

[0066] In some embodiments, referring to Figures 10-11 , the guide wing 8 comprises two, the two guide wings 8 are oppositely arranged, and the extension directions of the two guide wings 8 are collinear, at this time, the flow passage area occupied by the guide wing 8 is the smallest, while the guiding effect can be fully ensured, the action guiding property and flow capacity of the valve core 3 are ensured, and the passing efficiency of the liquid is improved.

[0067] In some embodiments, referring to Figures 12-15The guide wings 8 include three, three guide wings 8 are evenly distributed along the axis of the guide seat 32, and the included angle between adjacent two guide wings 8 is 120°.

[0068] It can be understood that the number of guide wings 8 can also be designed as four, five or even more.

[0069] In the check valve assembly of the embodiment, referring to Figures 10-11 or Figures 14-15 The guide wing 8 includes a connecting part 81 connected to one end of the guide wing 8 close to the inner wall of the valve body 1, the shape of the connecting part 81 is matched with the shape of the inner wall of the valve body 1, and the outer surface of the connecting part 81 is arranged abuttingly with the inner wall of the valve body 1. By arranging the connecting part 81, the abutting area of the guide wing 8 and the inner wall of the valve body 1 is increased, and the guiding effect of the guide wing 8 is further ensured.

[0070] In some embodiments, when the cross section of the valve body 1 is circular, the connecting part 81 is correspondingly arranged as a circular ring. The circular ring can avoid occupying too much flow passage area, and ensure the passing efficiency of the liquid.

[0071] It can be understood that the length of the connecting part 81 can be adjusted according to the actual situation of the check valve.

[0072] In the check valve assembly of the embodiment, referring to Figure 2 The valve core 3 includes: a valve core seat 31, a sealing surface is arranged on the valve core seat 31, an installation rod 311 is arranged on one end of the valve core seat 31 close to the valve seat 2, and the installation rod 311 is protrudingly arranged on the surface of the valve core seat 31; a guide seat 32, at least two guide wings 8 are arranged on the guide seat 32, a positioning hole 321 for accommodating the installation rod 311 is arranged on the guide seat 32, and the positioning hole 321 is fixedly connected or detachably connected with the installation rod 311.

[0073] In some embodiments, the valve core 3 adopts a split structure, the valve core seat 31 is positioned by arranging the installation rod 311 and the positioning hole 321, and the valve core seat 31 is centrally arranged. The positioning hole 321 and the installation rod 311 are preferably connected by fusion welding, and can also be connected by riveting or brazing, or can be connected by threads and the like.

[0074] In some embodiments, the valve core 3 can be integrally formed by powder metallurgy or hot forging, or cold heading and the like.

[0075] In the check valve assembly of the embodiment, referring to Figure 2 The valve body 1 includes: a mounting hole 11, the mounting hole is arranged on the valve body 1, and the mounting hole 11 is located on the side of the valve seat 2 away from the valve core 3; and a connecting pipe, the connecting pipe is inserted into the mounting hole. Specifically, the mounting hole 11 arranged on the valve body 1 is used to complete the installation of the connecting pipe.

[0076] In some embodiments, the mounting hole 11 is formed by a reaming process, a protrusion is formed on the outer surface of the valve body 1, and the connecting pipe is inserted into the mounting hole 11.

[0077] In some embodiments, for the convenience of customers to weld, the connecting pipe located outside the valve body 1 can be made of red copper.

[0078] In some embodiments, when the valve body 1 is made of stainless steel, the manufacturing process of the valve body 1 is as follows:

[0079] The stainless steel pipe is blanked, chamfered, ported, punched, cleaned, annealed, reamed, and shaped.

[0080] In some embodiments, the assembly process of the check valve assembly is as follows:

[0081] 1. The valve core 3 is assembled into the valve cavity of the valve body 1, and the welding ring 4 is sleeved in the welding ring groove 22 of the valve seat 2.

[0082] 2. The valve seat 2 is press-fitted into the valve cavity of the valve body 1.

[0083] 3. The connecting pipe is press-fitted into the mounting hole 11.

[0084] 4. The assembled check valve assembly is placed in a tunnel furnace for furnace welding.

[0085] 5. The welded check valve is detected for internal and external leakage tightness.

[0086] In the check valve assembly of the present embodiment, the check valve assembly is integrated inside the valve body 1, and the limiting structure 5 of the valve core 3 is limited by the change of the caliber of the valve body 1, reducing the application of the valve body shell, the blocking piece and other structures, and the structure and assembly steps are simpler, the stainless steel metal piece can be used as the valve core 3 and the valve seat 2, the check valve as a whole can be welded at high temperature, meeting the new welding process requirement and improving the product reliability.

[0087] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0088] Alternatively, the specific examples in the present embodiment can refer to the examples described in the above embodiments, which will not be described herein again.

[0089] The serial numbers of the above embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0090] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0091] The above only describes the preferred embodiments of the present application. It should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A check valve assembly characterized by, The utility model relates to a valve assembly, including: Valve body (1), be provided with valve cavity inside the valve body (1); Valve seat (2) is arranged in the valve cavity, the valve seat (2) is opened flow communication hole (21) on, the flow communication hole (21) with the valve cavity intercommunication; Valve core (3) is arranged in the valve cavity, the valve core (3) is provided with sealing surface, the valve core (3) can be moved relative to the valve seat (2), to make sealing surface abut or leave the valve seat (2); Welding ring (4) is arranged in the valve cavity, the welding ring (4) is set on the valve seat (2), when the welding ring (4) melts, flow to between the valve seat (2) and the inner wall of the valve body (1); The valve body (1) includes limit structure (5), the limit structure (5) is protrudingly arranged on the inner wall of the valve body (1), and the limit structure (5) is located on the side, away from the valve seat (2), of the valve core (3).

2. The check valve assembly of claim 1, wherein, The outer surface of the valve seat (2) is provided with a welding ring groove (22), which is located on the side of the valve seat (2) away from the valve core (3). The welding ring groove (22) contains the welding ring (4).

3. The check valve assembly of claim 2, wherein, The outer surface of the valve seat (2) is provided with a material accumulation groove (23), which is spaced apart from the welding ring groove (22). The material accumulation groove (23) is located on the side of the welding ring groove (22) close to the valve core (3).

4. The check valve assembly of claim 1, wherein, The sealing surface includes: A first sealing surface (61) is located on the end of the valve core (3) close to the valve seat (2). The first sealing surface (61) is perpendicular to the axis of the valve body (1). The first sealing surface (61) is abuttable with the valve seat (2).

5. The check valve assembly of claim 1, wherein, The sealing surface includes: A second sealing surface (62) is located on the side of the valve core (3) close to the valve seat (2). The extension direction of the second sealing surface (62) forms a preset angle with the axis of the valve body (1). The second sealing surface (62) is abuttable with a sealing portion (24) located on the valve seat (2). The shape of the sealing portion (24) is adapted to the second sealing surface (62).

6. The check valve assembly of claim 4, wherein, A first weight-reducing groove (71) is formed on the end of the valve core (3) close to the valve seat (2). The first weight-reducing groove (71) is recessed on the valve core (3). The first sealing surface (61) is uniformly distributed around the axis of the first weight-reducing groove (71).

7. The check valve assembly of claim 1, wherein The check valve assembly includes a guide wing (8) located on the side of the valve core (3) away from the valve seat (2). One end of the guide wing (8) is connected with the valve core (3). The other end of the guide wing (8) extends towards the inner wall of the valve body (1). The guide wing (8) includes at least two. The at least two guide wings (8) are spaced apart around the axis of the valve body (1).

8. The check valve assembly of claim 7, wherein, The guide wing (8) comprises a connecting part (81) connected with one end of the guide wing (8) close to the inner wall of the valve body (1), the shape of the connecting part (81) is matched with the shape of the inner wall of the valve body (1), and the outer surface of the connecting part (81) is abuttingly arranged with the inner wall of the valve body (1).

9. The check valve assembly of claim 7, wherein, The valve core (3) comprises: A valve core seat (31) provided with the sealing surface, one end of the valve core seat (31) close to the valve seat (2) is provided with a mounting rod (311), and the mounting rod (311) is protrudingly arranged on the surface of the valve core seat (31); A guide seat (32) provided with at least two guide wings (8), the guide seat (32) is provided with a positioning hole (321) for accommodating the mounting rod (311), and the positioning hole (321) is fixedly connected or detachably connected with the mounting rod (311).

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