Rotary melting check valve

Abstract

The utility model provides a rotary melting check valve, and belongs to the technical field of check valves. The technical problem that an existing check valve is insufficient in production efficiency while the sealing quality is guaranteed is solved. The rotary melting check valve comprises a lower check valve body, an upper check valve body and a core frame, the lower check valve body, the upper check valve body and the core frame are cylindrical and are coaxially arranged, one end of the core frame is inserted into the lower check valve body and is in close fit with the inner edge of the lower check valve body, and a rotary melting groove is formed between the periphery of the core frame and the inner edge of a port of the lower check valve body in the circumferential direction. And one end of the check valve upper body is positioned and inserted into the rotary melting groove and is fixedly connected with the check valve lower body and the core frame in a welding manner at the same time. According to the rotary melting check valve, the sealing effect is effectively guaranteed, and meanwhile the better production efficiency is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of check valves and relates to a rotary melting check valve. Background Art

[0002] The function of a check valve is to be connected to the front end of a pipeline, generally applied in a pipeline with a water pump, so that the pipeline behind the check valve is filled with water, thus preventing air from appearing during the water outlet process. It is the most common pipe fitting in industry and life, ranging from small-scale farm irrigation and household daily pipeline applications to large-scale main water supply pipelines.

[0003] Previously, the applicant developed a sealing mechanism for the check valve core holder with the authorization announcement number CN204784711U, which includes the upper valve body, lower valve body and core holder of the check valve. The outer wall of the core holder is provided with external threads, and the inner walls of the upper and lower valve cores are provided with internal threads. The upper and lower valve bodies are threadedly connected to the core holder. A ring groove is formed in the middle of the outer wall of the core holder, and an O-ring is arranged in the ring groove. An upper sealing inclined surface is formed on the inner wall of the lower end of the upper valve body, and a lower sealing inclined surface is formed on the inner wall of the upper end of the lower valve body. The upper and lower sealing inclined surfaces are in sealing contact with the O-ring.

[0004] The above-mentioned check valve product omits the process of applying glue, but still requires the operation of sleeving the O-ring and multiple screwing operations, and the production efficiency is still insufficient. Therefore, the applicant further researches and develops to improve the production efficiency of the check valve while ensuring the sealing effect of the check valve. Summary of the Invention

[0005] Aiming at the above problems existing in the prior art, the utility model provides a rotary melting check valve. The technical problem to be solved by the utility model is to improve the production efficiency of the check valve while ensuring the sealing quality.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] A rotary melting check valve includes a check valve lower body, a check valve upper body and a core holder that are all cylindrical and arranged coaxially. It is characterized in that one end of the core holder is inserted into the check valve lower body and is in tight fit with the inner edge of the check valve lower body. A rotary melting groove is arranged circumferentially between the outer periphery of the core holder and the inner edge of the port of the check valve lower body. One end of the check valve upper body is positioned and inserted into the rotary melting groove and is simultaneously welded and fixed to the check valve lower body and the core holder.

[0008] By inserting one end of the core holder into the lower body of the check valve to form a tight fit, and forming a spin welding groove between the outer periphery of the core holder and the inner edge of the port of the lower body of the check valve, the end of the upper body of the check valve is inserted into the spin welding groove and welded and fixed to the lower body of the check valve and the core holder. In this way, during production, the operator can first simply insert the core holder into the lower body of the check valve to form a preliminary installation, and then the spin welding equipment controls the spin welding of the upper body and the lower body of the check valve to complete the production. The operation steps in the whole process are simple and direct, without the need to tighten the core holder and set the sealing ring. In addition, when spin welding, the upper body of the check valve is pressed and can simultaneously frictionally melt with the lower body of the check valve and the core holder part in the spin welding groove and finally achieve sealed connection, thereby eliminating the gap between the lower body and the upper body of the check valve and the gap between the upper body of the check valve and the core holder, and realizing the seal between the three components through one melting operation, which has better production efficiency while effectively ensuring the sealing effect.

[0009] In the above-mentioned spin welded check valve, the end face of the upper body of the check valve facing the lower body of the check valve has a circumferentially arranged convex ring, and the convex ring is inserted into the spin welding groove and welded and fixed to the lower body of the check valve and the core holder at the same time, and the end face of the upper body of the check valve is welded and fixed to the end face of the lower body of the check valve at the same time. In this way, while the convex ring is welded and fixed to the inner wall of the spin welding groove, a welded and fixed seal can also be formed between the end face of the upper body of the check valve and the end face of the lower body of the check valve under pressure, realizing multiple seals in one process and ensuring the sealing effect and production efficiency.

[0010] In the above-mentioned spin welded check valve, the outer periphery of the other end of the core holder is in the shape of a conical surface arranged towards the side away from the lower body of the check valve, and the upper body of the check valve is sleeved on the periphery of the core holder. This is beneficial for the core holder to provide guidance to the upper body of the check valve during pre-assembly and enable the upper body of the check valve to be smoothly pre-inserted into the spin welding groove, ensuring the spin welding effect and production efficiency.

[0011] In the above-mentioned spin welded check valve, both side walls of the spin welding groove along the radial direction of the core holder have protruding welding parts, and the welding parts are arranged around the circumference of the spin welding groove, and the upper body of the check valve is welded and fixed to both welding parts. Since a force towards the lower body of the check valve needs to be applied axially to the upper body of the check valve during spin welding to generate friction, this is beneficial for the upper body of the check valve to be pressed and to generate friction with both welding parts in advance by extrusion to achieve synchronous welding and ensure the sealing effect.

[0012] In the above-mentioned spin welded check valve, the inner edge of the lower body of the check valve has an annular stepped surface, and the end face of the core holder is opposite to or abuts against the annular stepped surface along the axial direction of the lower body of the check valve. This is beneficial for providing a limit to the core holder pre-inserted into the lower body of the check valve, avoiding the core holder being inserted too deep and affecting the spin welding effect and the normal rebound of the valve core, and ensuring the product quality.

[0013] In the above-mentioned rotary melting check valve, a support cylinder coaxial with the upper body of the check valve is provided inside the lower body of the check valve. The inner edge of the core frame has a circumferentially arranged annular retaining edge. A cylindrical valve cap is provided on the core frame. One end of the valve cap penetrates through the annular retaining edge, and the other end of the valve cap is arranged outside the support cylinder. An annular gasket is hermetically sleeved on the outer periphery of the valve cap. The outer diameter of the gasket is larger than the inner diameter of the annular retaining edge. The gasket is axially fixed on the valve cap. A compression spring is arranged inside the support cylinder. Two ends of the compression spring respectively act on the inner cavity bottom surface of the support cylinder and the valve cap, and enable the gasket to be hermetically abutted against the annular retaining edge. In this way, the valve cap can move towards the support cylinder after being pressed, and the gasket is separated from the annular retaining edge, enabling the fluid to flow through the space between the inner edge of the annular retaining edge and the valve cap, realizing fluid circulation. The lower body of the check valve undertakes part of the function of the valve core, which is beneficial to reducing the assembly difficulty of the valve core. At the same time, components such as the core frame, the valve cap and the compression spring thereon can always maintain a relatively static state with the lower body of the check valve during the rotary melting process, avoiding damage to the valve core components and being beneficial to ensuring product quality.

[0014] In the above-mentioned rotary melting check valve, the annular retaining edge is in a horn shape with the small end facing away from the side where the lower body of the check valve is located. The outer periphery of the gasket is in a conical shape and fits with the inner wall of the annular retaining edge. In this way, the annular retaining edge can provide a guiding function for the reset of the valve cap, and at the same time is beneficial to increasing the sealing area between the gasket and the annular retaining edge, ensuring the sealing and check effect.

[0015] Compared with the prior art, the advantages of the present utility model are as follows:

[0016] This rotary melting check valve enables the upper body of the check valve to be fully welded and sealed with the lower body of the check valve and the outer periphery of the core frame by welding in the welding groove. The sealing effect is excellent, and the pre-installation of the core frame is convenient and efficient, which is beneficial to achieving multiple seals through one-time rotary melting, greatly improving the production efficiency. Description of the Drawings

[0017] Figure 1 is the sectional structure schematic diagram of this embodiment.

[0018] Figure 2 is Figure 1 the enlarged view of part A in

[0019] Figure 3 is the exploded view of the lower body of the check valve, the upper body of the check valve and the core frame in this embodiment.

[0020] In the figure, 1. Lower body of the check valve; 11. Annular stepped surface; 12. Support cylinder;

[0021] 2. Upper body of the check valve; 21. Convex ring;

[0022] 3. Core frame; 31. Annular retaining edge;

[0023] 4. Rotary melting groove; 41. Welding part;

[0024] 5. Valve cap; 6. Sealing gasket; 7. Compression spring. Specific embodiments

[0025] The following are specific embodiments of the present utility model and in combination with the accompanying drawings, the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0026] As Figures 1-3 shown, this rotary melting check valve includes a check valve lower body 1, a check valve upper body 2 and a core frame 3 that are all cylindrical and coaxially arranged. The check valve lower body 1, the check valve upper body 2 and the core frame 3 are all plastic parts. One end of the core frame 3 is inserted into the check valve lower body 1 and is tightly fitted with the inner edge of the check valve lower body 1. There is a circumferentially arranged rotary melting groove 4 between the outer circumference of the core frame 3 and the inner edge of the port of the check valve lower body 1. Specifically, there is a stepped portion at the port of the check valve lower body 1 and there is also a stepped portion on the outer circumference of the core frame 3 to form the rotary melting groove 4. One end of the check valve upper body 2 is positioned and inserted into the rotary melting groove 4 and is simultaneously welded and fixed to the check valve lower body 1 and the core frame 3. Further, there is a circumferentially arranged convex ring 21 at the inner edge of the end face of the check valve upper body 2 facing the check valve lower body 1. The convex ring 21 is inserted into the rotary melting groove 4 and is simultaneously welded and fixed to the check valve lower body 1 and the core frame 3. The end face of the check valve upper body 2 is simultaneously welded and fixed to the end face of the check valve lower body 1. The outer circumference of the other end of the core frame 3 is in the shape of a conical surface facing away from the side where the check valve lower body 1 is located. The outer circumferential surface of the other end of the core frame 3 is smoothly transitioned with the inner wall of the rotary melting groove 4. The check valve upper body 2 is sleeved around the outer periphery of the core frame 3. Both side walls of the rotary melting groove 4 along the radial direction of the core frame 3 have protruding welding parts 41, that is, the two welding parts 41 are respectively located on the inner edge of the port of the check valve lower body 1 and the outer circumferential surface of the core frame 3. The welding parts 41 are arranged around the circumference of the rotary melting groove 4. The side face of the welding part 41 facing the check valve upper body 2 is in the shape of a conical surface so that the molten material during the rotary melting process can flow to both sides to ensure the welding effect. The check valve upper body 2 is welded and fixed to both welding parts 41. The inner edge of the check valve lower body 1 has an annular stepped surface 11. The end face of the core frame 3 is axially opposite to the annular stepped surface 11 of the check valve lower body 1.

[0027] As Figure 1 、 Figure 2As shown, the lower body 1 of the check valve has a support cylinder 12 arranged coaxially with the upper body 2 of the check valve. The inner edge of the core frame 3 has a circumferentially arranged annular stop edge 31. A cylindrical valve cap 5 is provided on the core frame 3. One end of the valve cap 5 penetrates through the annular stop edge 31, and the other end of the valve cap 5 is arranged outside the support cylinder 12. An annular gasket 6 is hermetically sleeved on the outer periphery of the valve cap 5. The gasket 6 is a soft rubber part. The outer diameter of the gasket 6 is larger than the inner diameter of the annular stop edge 31. The gasket 6 is axially fixed on the valve cap 5. A compression spring 7 is arranged in the support cylinder 12. The two ends of the compression spring 7 respectively act on the bottom surface of the inner cavity of the support cylinder 12 and the valve cap 5 to make the gasket 6 and the annular stop edge 31 be in sealing contact. The annular stop edge 31 is in a trumpet shape with the small end facing away from the side where the lower body 1 of the check valve is located. The outer periphery of the gasket 6 is in a conical shape and fits with the inner wall of the annular stop edge 31.

[0028] During production, the operator first places the lower body 1 of the check valve on the spin welding platform, then installs the compression spring 7 into the support cylinder 12, places the valve cap 5 with the gasket 6, then sleeves the valve core on the outer periphery of the valve cap 5 and presses it down and inserts it into the lower body 1 of the check valve to form a tight fit. Finally, the upper body 2 of the check valve is placed on the lower body 1 of the check valve, and spin welding is achieved by operating the spin welding platform to complete the production.

[0029] The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A rotary melting check valve, comprising a check valve lower body (1), a check valve upper body (2) and a core frame (3) which are all cylindrical and coaxially arranged, characterized in that: One end of the core frame (3) is inserted into the lower body (1) of the check valve and is tightly matched with the inner edge of the lower body (1) of the check valve. A circumferentially arranged rotary melting groove (4) is provided between the outer periphery of the core frame (3) and the inner edge of the port of the lower body (1) of the check valve. One end of the upper body (2) of the check valve is positioned and inserted into the rotary melting groove (4) and is simultaneously welded and fixedly connected to the lower body (1) of the check valve and the core frame (3).

2. The rotary melt check valve according to claim 1, characterized in that: The end surface of the check valve upper body (2) facing the check valve lower body (1) has a circumferentially arranged protruding ring (21), the protruding ring (21) is inserted into the rotary melting groove (4) and is simultaneously welded and fixedly connected to the check valve lower body (1) and the core frame (3), and the end surface of the check valve upper body (2) is simultaneously welded and fixedly connected to the end surface of the check valve lower body (1).

3. The rotary melt check valve according to claim 1 or 2, characterized in that: The outer periphery of the other end of the core frame (3) is in the shape of a cone, which is arranged towards the side away from the lower body (1) of the check valve, and the upper body (2) of the check valve is sleeved on the outer periphery of the core frame (3).

4. The rotary melt check valve according to claim 1 or 2, characterized in that: The two radial side walls of the rotary melting groove (4) along the core frame (3) are provided with protruding welding parts (41), the welding parts (41) are arranged around the circumference of the rotary melting groove (4), and the upper body (2) of the check valve is welded and fixedly connected to the two welding parts (41).

5. The rotary melt check valve according to claim 1 or 2, characterized in that: The inner edge of the check valve lower body (1) has an annular step surface (11), and the end surface of the core frame (3) is opposite to or abuts against the annular step surface (11) along the axial direction of the check valve lower body (1).

6. The rotary melt check valve according to claim 1 or 2, characterized in that: The lower body (1) of the check valve has a support cylinder (12) arranged coaxially with the upper body (2) of the check valve, the inner edge of the core frame (3) has an annular retaining edge (31) arranged circumferentially, the core frame (3) is provided with a cylindrical valve cap (5), one end of the valve cap (5) passes through the annular retaining edge (31), and the other end of the valve cap (5) is arranged on the periphery of the support cylinder (12), the outer peripheral sealing sleeve of the valve cap (5) is provided with an annular sealing gasket (6), the outer diameter of the sealing gasket (6) is larger than the inner diameter of the annular retaining edge (31), the sealing gasket (6) is axially fixed to the valve cap (5), and the support cylinder (12) is provided with a compression spring (7), the two ends of the compression spring (7) respectively act on the inner cavity bottom surface of the support cylinder (12) and the valve cap (5) to make the sealing gasket (6) and the annular retaining edge (31) seal against each other.

7. The rotary melt check valve according to claim 6, characterized in that: The annular retaining edge (31) is in the shape of a trumpet with the small end facing away from the side where the lower body (1) of the check valve is located. The outer periphery of the sealing gasket (6) is in the shape of a cone and fits with the inner wall of the annular retaining edge (31).

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