Wafer type check valve

Abstract

The utility model discloses a wafer type check valve, relates to the technical field of check valves, and solves the problems that accurate return cannot be realized due to radial shaking and the like. The valve clack comprises a circular truncated cone body and a disc body, the disc body is arranged on the periphery of the circular truncated cone body in a surrounding mode and is in a radial outward protruding shape, and one end of the spring abuts against the disc body. A first chamfer is arranged at the front end, close to the inlet, of the circular truncated cone, a second chamfer is arranged on the periphery of the disc body, a third chamfer is arranged at the inlet of the valve body, a guide inner cylinder is fixedly installed in the middle cavity wall, and a conical slope is arranged on the inner wall of the guide inner cylinder. The first chamfer and the third chamfer are attached to form sealing when the valve clack is closed, and the second chamfer and the conical slope are attached and matched when the valve clack is closed. It is ensured that the valve clack moves along a preset path in the initial opening process and the to-be-closed process, and therefore radial shaking is reduced; the effect of guiding the valve clack to return accurately can be achieved through the chamfer and the conical inclined face, leakage caused by shaking is reduced, and the good sealing effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a clamp-type check valve. Background Art

[0002] The wafer check valve is a type of valve used in pipeline systems, mainly used to prevent reverse flow of fluid. Compared with flange connection or other types of connection methods, the wafer check valve is fixed between pipes by clamping, which is more convenient and quick to install and disassemble. The prior art discloses CN211715839U, a Chinese utility model patent for a wafer silent check valve, which solves the problems of numerous parts and high manufacturing cost, eliminates the parts of the valve cover and valve stem, reduces the number of parts, and eliminates the problem of valve stem vibration, wear or breakage. However, in actual use, the check valve of this technical solution has certain limitations. Especially in an environment where the fluid flow is relatively turbulent, the valve disc is prone to radial shaking, especially when it is opened or about to be closed. This shaking will cause the valve disc to fail to return to its position accurately, thereby causing leakage problems. In addition, the valve disc may break away from the constraint of the spring during the shaking process, further affecting the normal working performance of the valve. Summary of the invention

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a clamp-type check valve to solve the problem of inability to accurately return to the original position due to radial shaking.

[0004] The technical solution of the utility model comprises a valve body, a valve disc and a spring, a flow channel cavity is formed in the valve body, the flow channel cavity has an inlet, an outlet and a middle cavity wall, the spring is elastically supported at the valve disc and the outlet of the flow channel cavity, the valve disc comprises a frustum body and a disc body, the disc body is arranged around the outer circumference of the frustum body and is in the shape of a radial outward protrusion, and one end of the spring is pressed against the disc body; a first chamfer is arranged at the front end position of the frustum body close to the inlet, a second chamfer is arranged at the outer periphery of the disc body, a third chamfer is arranged at the inlet of the valve body, a guide inner cylinder is fixedly installed in the middle cavity wall, and a conical inclined surface is provided on the inner wall of the guide inner cylinder; the first chamfer and the third chamfer fit together to form a seal when the valve disc is closed, and the second chamfer and the conical inclined surface fit together when the valve disc is closed.

[0005] By adopting the above technical scheme, the cooperation between the first chamfer and the third chamfer provides a guiding effect, ensuring that the valve disc moves along a predetermined path during the initial opening and closing process, thereby reducing radial shaking. Moreover, the convex shape of the disc body is combined with the conical surface of the guide inner tube to more effectively limit the lateral movement of the valve disc, reduce the range of radial shaking during the opening and closing process, increase the stability of the valve disc movement, and reduce the possibility of spring detachment; in addition, the role of the chamfer and the conical surface can guide the valve disc to return to its position accurately, reduce leakage caused by shaking, and ensure a good sealing effect.

[0006] In a possible design, the diameter of the frustum is gradually reduced along the fluid flow direction, and a flow channel with a gradually increasing flow area is formed between the frustum and the wall of the middle cavity.

[0007] The above design helps the fluid to smoothly transition from a narrow inlet to a wider outlet area, reducing turbulence during fluid flow and making the fluid flow smoother. Smooth fluid transition and lower fluid resistance also help reduce noise caused by turbulence, which is very suitable for applications in low-noise operating environments.

[0008] In a possible design, the spring is a conical spring, the diameter of which gradually increases along the flow direction of the fluid, and the end of the spring with a larger diameter abuts against the wall of the middle cavity to form a limit.

[0009] With the above design, the special shape of the conical spring can better adapt to the movement trajectory of the valve disc, help reduce the radial shaking of the valve disc during the opening and closing process, and can provide relatively uniform supporting force under different compression degrees, helping to ensure that the valve disc can obtain appropriate elastic support throughout the opening and closing process, thereby improving the stability and reliability of the valve; in addition, the larger diameter end of the conical spring is actually supported at the outlet of the flow channel cavity, and the middle cavity wall limits the radial movement of the spring, preventing the conical spring from shaking out of the preset position and affecting the normal effect of the valve.

[0010] In a possible design, a limit stopper is provided at the outlet of the flow channel cavity, and the limit stopper spans the outlet position of the flow channel cavity and is fixedly connected to the valve body.

[0011] With the above design, the limit stopper effectively limits the maximum opening position of the valve disc, ensuring that the valve disc does not exceed the preset stroke range, thereby avoiding damage or failure that may be caused by excessive opening of the valve disc.

[0012] In a possible design, a concave conical groove is formed on the rear end surface of the truncated cone body, and a conical guide platform is provided on the limit stopper, and the guide platform is matched with the conical groove.

[0013] With the above design, the guide platform is placed in the conical groove when the valve is opened to the maximum, and the guide valve disc is limited by the guide platform when it is opened to the maximum, thereby reducing the radial shaking at this time and further improving the stability of the valve disc after opening.

[0014] In a possible design, the guide inner cylinder is made of rubber or plastic.

[0015] With the above design, the rubber or plastic material has certain shock absorption and sound insulation properties, which helps to reduce the collision sound between the valve disc and the guide inner cylinder, and reduce the noise level generated when the valve is operated. Moreover, flexible materials such as rubber or plastic can better adapt to the fit between the second chamfer of the disc body and the conical inclined surface of the guide inner cylinder, thereby improving the sealing performance when the valve is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance structure of a specific embodiment of the utility model;

[0017] Figure 2 It is a cross-sectional schematic diagram of the utility model in a closed state;

[0018] Figure 3 It is a cross-sectional schematic diagram of the utility model in the open state;

[0019] Figure 4 It is an exploded view of a specific embodiment of the utility model;

[0020] Among them, 1. valve body; 2. valve disc; 3. spring; 11. inlet; 12. middle cavity wall; 13. outlet; 21. truncated cone body; 22. disc body; 211. first chamfer; 221. second chamfer; 14. third chamfer; 4. guide inner cylinder; 41. conical slope; 5. limit stopper; 212. conical groove; 51. guide platform. DETAILED DESCRIPTION

[0021] like Figure 1-Figure 4The wafer-type check valve shown in the figure comprises a valve body 1, a valve disc 2 and a spring 3. A flow channel cavity for fluid circulation is formed in the valve body 1. The flow channel cavity has an inlet 11, a middle cavity wall 12 and an outlet 13 in the order of the fluid flow direction. The spring 3 is elastically supported at the valve disc 2 and the flow channel cavity outlet 13. The valve disc 2 comprises a truncated cone body 21 and a disc body 22, wherein the truncated cone body 21 is a main blocking component and can seal and close the inlet 11; the disc body 22 is arranged around the outer circumference of the truncated cone body 21 and is in a radially outward convex shape, and one end of the spring 3 abuts against one end surface of the disc body 22. A first chamfer 211 is provided at the front end of the truncated cone body 21 near the inlet 11, a second chamfer 221 is provided on the periphery of the disc body 22, a third chamfer 14 is provided at the inlet 11 of the valve body 1, a guide inner cylinder 4 is fixedly installed in the middle cavity wall 12, and a conical slope 41 is provided on the inner wall of the guide inner cylinder 4. The inclination directions of the first chamfer 211, the second chamfer 221, the third chamfer 14, and the conical slope 41 are all inclined radially outward along the fluid flow direction, so that the first chamfer 211 and the third chamfer 14 can fit together to form a seal when the valve flap 2 is closed, and the second chamfer 221 and the conical slope 41 fit together when the valve flap 2 is closed. When the valve flap 2 is opened, the valve flap 2 retreats due to the fluid pressure, the spring 3 is compressed, the opening of the valve flap 2 gradually increases, and the fluid flows into the middle cavity wall 12; during the closing process of the valve flap 2, the valve flap 2 is guided to return to the center under the cooperation of the third chamfer 14 and the conical inclined surface 41, and the valve flap 2 gradually fits the positioning position until it is closed and sealed.

[0022] The diameter of the truncated cone 21 gradually decreases along the flow direction of the fluid, that is, the diameter of the truncated cone 21 near the inlet 11 is larger than the diameter near the outlet 13, and a flow channel with a gradually increasing flow area is formed between the truncated cone 21 and the middle cavity wall 12. During operation, the fluid flows in from the inlet 11, transitions to the flow channel with a wider flow area, and is discharged from the outlet 13, making the fluid flow smoother, reducing the occurrence of fluid turbulence, and helping to reduce the generation of noise.

[0023] The spring 3 is a conical spring 3, which is shaped like a pagoda and has multiple levels of gradually increasing diameters. The diameter of the spring 3 gradually increases along the flow direction of the fluid. The end of the conical spring 3 with a smaller diameter abuts against the disc body 22, and the end of the spring 3 with a larger diameter is close to the flow channel cavity outlet 13, and the outer side of the spring 3 is in contact with and abuts against the middle cavity wall 12. The middle cavity wall 12 forms a constraint on the end of the spring 3 to ensure that the end of the spring 3 maintains its position during use.

[0024] The flow channel cavity outlet 13 is provided with a limit stopper 5, which spans the flow channel cavity outlet 13 along the radial direction of the outlet 13, and the limit stopper 5 is fixedly connected to the valve body 1. The limit stopper 5 can limit the stroke of the valve flap 2, especially when the fluid pressure is too large, to prevent the valve flap 2 from deviating from the preset stroke range.

[0025] A concave conical groove 212 is provided on the rear end face of the truncated cone body 21, and a conical guide platform 51 is provided on the limit stopper 5, and the guide platform 51 is matched with the conical groove 212. When the valve is opened to the maximum, the guide platform 51 will be placed in the conical groove 212, and due to the shapes of the two, the valve disc 2 can be guided to be centered when it is opened to the maximum, thereby reducing the radial shaking at this time.

[0026] The guide inner cylinder 4 is made of rubber or plastic, and the guide inner cylinder 4 can be embedded and installed in the middle cavity wall 12 to fix the guide inner cylinder 4 .

Claims

1. A wafer-type check valve, comprising a valve body (1), a valve disc (2) and a spring (3), wherein a flow channel cavity is formed in the valve body (1), the flow channel cavity having an inlet (11), an outlet (13) and a middle cavity wall (12), and the spring (3) is elastically supported at the valve disc (2) and the flow channel cavity outlet (13), characterized in that: The valve flap (2) comprises a truncated cone body (21) and a disc body (22); the disc body (22) is arranged around the outer circumference of the truncated cone body (21) in the shape of a radial outward protrusion, and one end of the spring (3) abuts against the disc body (22); a first chamfer (211) is arranged at the front end of the truncated cone body (21) close to the inlet (11), a second chamfer (221) is arranged at the outer periphery of the disc body (22), a third chamfer (14) is arranged at the inlet (11) of the valve body (1), a guide inner cylinder (4) is fixedly installed in the middle cavity wall (12), and a conical inclined surface (41) is provided on the inner wall of the guide inner cylinder (4); the first chamfer (211) and the third chamfer (14) fit together to form a seal when the valve flap (2) is closed, and the second chamfer (221) and the conical inclined surface (41) fit together when the valve flap (2) is closed.

2. The wafer-type check valve according to claim 1, characterized in that: The diameter of the frustum (21) gradually decreases along the flow direction of the fluid, and a flow channel with a gradually increasing flow area is formed between the frustum (21) and the middle cavity wall (12).

3. The wafer-type check valve according to claim 1 or 2, characterized in that: The spring (3) is a conical spring (3), the diameter of which gradually increases along the flow direction of the fluid, and the end of the spring (3) with a larger diameter abuts against the middle cavity wall (12) to form a limit.

4. The wafer-type check valve according to claim 1 or 2, characterized in that: The flow channel cavity outlet (13) is provided with a limit stopper (5), and the limit stopper (5) spans the flow channel cavity outlet (13) and is fixedly connected to the valve body (1).

5. The wafer-type check valve according to claim 4, characterized in that: A concave conical groove (212) is formed on the rear end surface of the truncated cone body (21), and a conical guide platform (51) is provided on the position limiting block (5), wherein the guide platform (51) is adapted to the conical groove (212).

6. The wafer-type check valve according to claim 1 or 2, characterized in that: The guide inner cylinder (4) is made of rubber or plastic.

Images