A check valve

Abstract

The present invention discloses a check valve, comprising a valve body, wherein the inlet and outlet ends of the valve body are respectively welded with a first annular baffle and a second annular baffle matching each other inwardly along their respective radial directions; an elbow with a clearance fit is provided in the valve body, the inlet end cover of the elbow is provided on the inner ring of the first annular baffle, the outlet end of the elbow forms an angle of 20°-25° with the first annular baffle, and a matching silicone ring is provided on the elbow; a valve stem is rotatably mounted in the valve body, and a blade is connected to the valve stem, which is clearance-matched with the inner wall of the valve body and is used to open and close the outlet end of the elbow; the blade is in the shape of a pot cover, and a groove matching the silicone ring is provided on the surface of the outlet end of the elbow for opening and closing the elbow. The present invention solves the technical problem of how to make the check valve suitable for both vertical and horizontal installations and improve its airtightness, and has the advantages of good airtightness, a wide range of installation applications, and strong versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a check valve. Background Art

[0002] Check valves are commonly used in industrial exhaust systems. Existing check valves achieve airtightness by overlapping blades on a retaining bar on the inner wall of the valve body. This significantly limits the check valve to either vertical or horizontal installation, limiting its applicability. Furthermore, the impact of the overlap can slightly deform the blades and retaining bar. Furthermore, to ensure the blades can rotate normally, a gap is left between the blades and the inner wall of the valve body, resulting in poor airtightness. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a check valve to achieve the purposes of good sealing performance, wide installation application range and strong versatility.

[0004] In order to solve the above technical problems, the present invention provides a check valve, including a valve body, wherein the inlet end and the outlet end of the valve body are respectively welded with a matching first annular baffle and a second annular baffle along their respective radial inward directions, and a clearance-fitting elbow is provided in the valve body, and the inlet end cover of the elbow is provided on the inner ring of the first annular baffle, and an angle of 20°-25° is formed between the outlet end of the elbow and the first annular baffle, and a matching silicone ring is provided thereon, and a valve stem is rotatably installed in the valve body, and a blade is connected to the valve stem, which is clearance-fitted with the inner wall of the valve body and is used to open and close the outlet end of the elbow, the blade is in the shape of a pot cover, and a groove matching the silicone ring is provided on the surface of the outlet end of the elbow for opening and closing the elbow.

[0005] In a preferred embodiment of the present invention, both ends of the valve stem extend out of the valve body, and one end thereof is transmission-connected to a driving device.

[0006] In a preferred embodiment of the present invention, the driving device is a servo motor or a gas actuator.

[0007] In a preferred embodiment of the present invention, the valve stem is provided with a pair of linkage bars symmetrically arranged about its center, and the other ends of the linkage bars are commonly connected to a linkage plate, which is detachably mounted in the middle of the away surface of the outlet end of the blade that opens and closes the elbow.

[0008] In a preferred embodiment of the present invention, the facing away surface of the outlet end of the blade that opens and closes the elbow is threadedly connected to the linkage plate.

[0009] In a preferred embodiment of the present invention, the linkage bars are sleeved on the valve stem through a brass sleeve.

[0010] In a preferred embodiment of the present invention, the first annular baffle is welded with a first flange on the surface facing away from the valve body, and the second annular baffle is welded with a second flange on the surface facing away from the valve body, and the second annular baffle is welded with a second flange on the surface facing away from the valve body.

[0011] In a preferred embodiment of the present invention, the edge of the blade is covered with a sealing strip.

[0012] In a preferred embodiment of the present invention, the sealing strip is composed of a graphite core and a stainless steel mesh wrapped around the graphite core.

[0013] In a preferred embodiment of the present invention, the cross section of the valve body is elliptical and is made of stainless steel.

[0014] The present invention has the following beneficial effects: by providing a clearance-fit elbow within the valve body, with the inlet end of the elbow communicating with the inlet end of the valve body, and the outlet end of the elbow forming an angle of 20°-25° with the inlet end of the valve body, and with a matching silicone ring mounted thereon; and by providing a groove matching the silicone ring on the opening and closing surface of the blade at the outlet end of the elbow for opening and closing the elbow, the blade completely covers the outlet end of the elbow at an angle of 20°-25° within the valve body, with the silicone ring embedded in the groove on the blade, thereby achieving the technical effect of making the check valve suitable for both vertical and horizontal installation and improving its airtightness. Compared with existing technologies, the present invention has better airtightness, a wider range of installation applications, and greater versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the present invention without the valve body;

[0017] Figure 3 is an exploded view of the present invention;

[0018] Explanation of the numbers in the figure: 1. Valve body, 2. First annular baffle, 3. Second annular baffle, 4. Elbow, 5. Silicone ring, 6. Valve stem, 7. Blade, 71. Groove, 8. Linkage bar, 9. Linkage plate, 10. Brass sleeve, 11. First flange, 12. Second flange. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0020] Reference Figure 1 、 Figure 2 and Figure 3As shown: A check valve includes a valve body 1. In this embodiment, the cross section of the valve body 1 is elliptical and is made of stainless steel. The inlet and outlet ends of the valve body 1 are respectively welded with a matching first annular baffle 2 and a second annular baffle 3 along their respective radial directions inward. A clearance-fitting elbow 4 is provided in the valve body 1. The inlet end cover of the elbow 4 is arranged on the inner ring of the first annular baffle 2. The outlet end of the elbow 4 forms an angle of 20°-25° with the first annular baffle 2, and a matching silicone ring 5 is mounted thereon. A valve stem 6 is rotatably installed in the valve body 1. The valve stem 6 is connected to a blade 7 that is clearance-fitted with the inner wall of the valve body 1 and is used to open and close the outlet end of the elbow 4. In one embodiment of the present invention, the blade 7 opens and closes the outlet end of the elbow 4 by its own gravity and medium pressure; in another embodiment of the present invention, the blade 7 opens and closes the outlet end of the elbow 4 under the drive of the valve stem 6. Specifically, both ends of the valve stem 6 extend out of the valve body 1, and one end thereof is transmission-connected to a driving device, which is a servo motor or a gas actuator. The blade 7 is pot-lid-shaped and has a groove 71 on the surface of the outlet end of the opening and closing elbow 4 that matches the silicone ring 5. In the present invention, since the blade 7 is pot-lid-shaped and is located in the valve body 1 with a clearance fit, and is closed on the outlet end of the elbow 4 at an angle of 20°-25°, the silicone ring 5 mounted on the outlet end of the elbow 4 is embedded in the groove 71 of the blade 7 during the closing process, thereby achieving the technical effect of making the check valve suitable for both vertical and horizontal installation and improving its airtightness.

[0021] In a preferred embodiment of the present invention, the valve stem 6 is provided with a pair of linkage bars 8 symmetrically arranged about its center, and the other ends of the linkage bars 8 are commonly connected to a linkage plate 9. The linkage plate 9 is detachably mounted in the middle of the away surface of the outlet end of the opening and closing elbow 4 of the blade 7. The away surface of the outlet end of the opening and closing elbow 4 of the blade 7 is threadedly connected to the linkage plate 9. This arrangement not only extends the service life of the blade 7, but also ensures the stability of the operation of the blade 7.

[0022] In a preferred embodiment of the present invention, the linkage bar 8 is sleeved on the valve stem 6 through a brass sleeve 10. This arrangement effectively reduces the friction between the valve stem 6 and the linkage bar 8, and effectively extends the service life of both.

[0023] In a preferred embodiment of the present invention, the first annular baffle 2 is welded with a first inner flange 11 on the surface facing away from the valve body 1, and the second annular baffle 3 is welded with a second inner flange 12 on the surface facing away from the valve body 1. This arrangement facilitates the installation of the check valve.

[0024] In a preferred embodiment of the present invention, the edge of the blade 7 is covered with a sealing strip, which is composed of a graphite core and a stainless steel mesh covered on the graphite core. This arrangement further improves the airtightness.

[0025] In summary, the present invention provides an elbow 4 with a clearance fit in the valve body 1, the inlet end of the elbow 4 is connected to the inlet end of the valve body 1, and an angle of 20°-25° is formed between the outlet end of the elbow 4 and the inlet end of the valve body 1, and a matching silicone ring 5 is mounted thereon; and a groove 71 matching the silicone ring 5 is provided on the opening and closing surface of the blade 7 at the outlet end of the elbow 4 for opening and closing the elbow 4, so that the blade 7 completely covers the outlet end of the elbow 4 at an angle of 20°-25° in the valve body 1, and the silicone ring 5 is embedded in the groove 71 on the blade 7, so the present invention can be applied to both vertical installation and horizontal installation, and the airtightness is improved, and it has the advantages of a wide range of installation applications, good airtightness and strong versatility.

[0026] The above embodiments are merely preferred embodiments for the purpose of fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

Claims

1. A check valve, characterized in that: The valve body comprises a valve body, the cross section of which is elliptical, the inlet end and the outlet end of the valve body being respectively welded with a first annular baffle and a second annular baffle matching each other inwardly along their respective radial directions, an elbow with a clearance fit is provided in the valve body, the inlet end cover of the elbow is provided on the inner ring of the first annular baffle, the outlet end of the elbow forms an angle of 20°-25° with the first annular baffle, and a matching silicone ring is sleeved thereon, a valve stem is rotatably installed in the valve body, the valve stem is connected to a blade which is clearance-matched with the inner wall of the valve body and is used to open and close the outlet end of the elbow, the blade is in the shape of a pot cover, and a groove matching the silicone ring is provided on the surface of the valve stem for opening and closing the outlet end of the elbow, so that the blade completely covers the outlet end of the elbow at an angle of 20°-25° in the valve body; during the closing process of the blade, the silicone ring sleeved on the outlet end of the elbow is embedded in the groove of the blade, so that the check valve is suitable for both vertical and horizontal installation; The valve stem is provided with a pair of linkage bars symmetrically arranged about its middle part, and the other ends of the linkage bars are commonly connected to a linkage plate, which is detachably mounted on the middle part of the away surface of the outlet end of the vane for opening and closing the elbow.

2. The check valve according to claim 1, wherein: Both ends of the valve stem extend out of the valve body, and one end thereof is transmission-connected with a driving device.

3. The check valve according to claim 2, wherein: The driving device is a servo motor or a gas actuator.

4. The check valve according to claim 1, wherein: The facing away surface of the outlet end of the blade for opening and closing the elbow is threadedly connected to the linkage plate.

5. The check valve according to claim 1, wherein: The linkage bars are sleeved on the valve stem through a brass sleeve.

6. The check valve according to claim 1, wherein: The first annular baffle is welded with a first flange on the surface facing away from the valve body, and the second annular baffle is welded with a second flange on the surface facing away from the valve body.

7. The check valve according to claim 1, wherein: The edges of the blades are covered with sealing strips.

8. The check valve according to claim 7, wherein: The sealing strip consists of a graphite core and a stainless steel mesh wrapped around the graphite core.

9. The check valve according to claim 1, wherein: The cross section of the valve body is elliptical and is made of stainless steel.

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