Valve plate isolating mechanism of isolating valve

Abstract

The utility model discloses a valve plate isolating mechanism of an isolating valve, which comprises a butterfly plate and a sealing piece, the butterfly plate and the sealing piece are fixed on a rotating shaft of the isolating valve through fasteners, and two ends of the rotating shaft penetrate into self-lubricating bearings fixed in a valve body. The rotating shaft rotates to drive the butterfly plate and the sealing piece to rotate, and the sealing piece is tightly attached to the inner arm of the valve body to achieve the function of separating media. The shaft end is in soft contact with or tightly pressed with the valve body through a sealing ring or a sealing gasket, so that the function of preventing media from leaking is achieved. The soft limiting block in the valve body stops the butterfly plate from rotating, and the effect of protecting the butterfly plate from stress deformation is achieved. The problems that medium isolation is difficult to achieve at the supporting position of a small-specification isolation valve, the valve seat is difficult to machine, zero leakage of media is difficult to achieve, and sealing and closed state limiting are difficult to achieve at the shaft end are solved, and the medium isolation function is more reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a valve plate partition mechanism of an isolation valve. Background Art

[0002] An isolation valve is a valve product that relies on a rotating shaft to drive the valve plate to rotate inside the valve body, and uses the valve plate and sealing sheet to isolate the flowing medium. Because both ends of the shaft penetrate the valve body cylinder, conventional multi-offset valves often use the valve seat offset method to press the sealing sheet and valve seat tightly to achieve medium isolation. The sealing method is unreliable and it is easy to leak through the valve body. The small-sized isolation valve has a thinner valve body cylinder, and sometimes the cylinder is longer, making it difficult to process the valve seat inside the valve body; therefore, it is necessary to design a new structure of the isolation mechanism to achieve the isolation function of the flowing medium. Summary of the invention

[0003] The purpose of the embodiment of the utility model is to provide a valve plate partition mechanism for an isolation valve, so as to solve the problems in the prior art that it is difficult to isolate the medium at the support of small-sized isolation valves, the valve seat is difficult to process, the medium is prone to leakage, the shaft end is difficult to seal, and the closed state is difficult to limit.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is a valve plate isolation mechanism of an isolation valve, comprising a valve body, the side wall of the valve body is a hollow cylinder, an axial hole is opened on the side wall, and a cylindrical shaft groove extends outward from the axial hole of the side wall of the valve body to fix and limit the rotating shaft;

[0005] The rotating shaft is used to drive the butterfly plate to rotate; one end of the rotating shaft passes through the transparent cover and is connected to the external device, and the transparent cover is fixedly connected to the shaft groove on the valve body through the fourth fastener; an end cover is provided at the other end of the rotating shaft, and the end cover is fixedly connected to the shaft groove on the valve body through the third fastener;

[0006] The butterfly plate is used to isolate the medium; the butterfly plate includes two upper and lower circular metal plates with the same diameter as the inner wall of the valve body; the rotating shaft is clamped between the upper and lower butterfly plates by bolts and fixed to the rotating shaft by a first fastener.

[0007] Furthermore, a circular soft sealing sheet with the same diameter as the inner wall of the valve body is sandwiched between the upper and lower pieces of the butterfly plate and the rotating shaft; and the valve plate partition mechanism includes more than two sealing sheets.

[0008] Furthermore, a self-lubricating bearing is embedded between the shaft groove on the valve body and the rotating shaft; a sealing gasket is clamped between the end cover and the valve body; a sealing ring and a sealing ring are arranged between the rotating shaft and the valve body, close to the transparent cover, and the sealing ring is a cylindrical rubber sleeve with a groove on the side, and the sealing ring is a metal ring used to fix the sealing ring.

[0009] Furthermore, a connector perpendicular to the inner wall of the valve body is provided on the inner wall of the valve body, and the connector fixes the limiting rubber block on the side close to the butterfly plate through a second fastener; when the limiting rubber block is tightly attached to the butterfly plate, the butterfly plate is perpendicular to the inner wall of the valve body.

[0010] The beneficial effects of the utility model are as follows: the isolation valve plate partition mechanism of the isolation valve of the utility model has a simple structure and is easy to assemble; double sealing rings are used for sealing in the valve plate, and the sealing method is reliable. The periphery of the sealing gasket is in direct soft and hard contact with the inner wall of the cylinder to achieve sealing. The sealing method is simple and effectively solves the problem of medium isolation at the point where the rotating shaft penetrates the valve body. The sealing rings are sealed on both sides, and the shaft end seal is a whole piece seal or a whole circle seal. The sealing ring has good connectivity, good sealing performance and a reliable method, and can ensure that the medium does not leak out; the medium flow direction can be alternating or bidirectional; the production and processing technology of each part of the utility model is simple, the butterfly plate sheet metal parts only need to be bent after cutting, and the processing is convenient, the butterfly plate limit is soft contact, the stress is small, and the butterfly plate is effectively protected from deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a cross-sectional view of the valve plate partition mechanism of the isolation valve.

[0013] Figure 2 It is an enlarged view of the rotating shaft installation end and the end of the isolation valve plate isolation mechanism.

[0014] Figure 3 It is a schematic diagram of the open and closed states of the isolation valve plate partition mechanism, where (a) is the open state and (b) is the closed state.

[0015] Among them, 1. valve body; 2. butterfly plate; 3. rotating shaft; 4. sealing plate; 5. second fastener; 6. limiting rubber block; 7. first fastener; 8. self-lubricating bearing; 9. sealing gasket; 10. end cover; 11. third fastener; 12. sealing ring; 13. sealing ring; 14. transparent cover; 15. fourth fastener; 16. connector. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Figure 1 , Figure 2 A valve plate isolation mechanism for an isolation valve is shown.

[0018] The valve plate isolation mechanism includes a butterfly plate 2, which is used to control the flow of fluid and isolate the medium. The butterfly plate 2 is divided into two upper and lower parts, and the sealing plate 4 is clamped between the upper and lower parts. The sealing plate 4 is pressed between the upper and lower butterfly plates 2 by bolts. The sealing plate 4 is tightly fastened to both sides of the rotating shaft 3; the upper and lower butterfly plates 2 are fixed to the rotating shaft 3 at the midline position by the first fastener 7, and the first fastener 7 includes a conical pin; each rotating shaft 3 is fixed with the butterfly plate 2 by more than two first fasteners 7. The size of the sealing plate 4 is the same as the inner wall diameter of the valve body 1. The butterfly plate 2 is made of carbon steel or stainless steel, and the sealing plate 4 is made of silicone rubber or other waterproof soft materials.

[0019] In this specific embodiment and the drawings, the sealing sheet 4 consists of two pieces, an upper piece and an lower piece, respectively located on the upper side and the lower side of the rotating shaft 3. This specific embodiment and the drawings are only an example and not a limitation. In actual applications, those skilled in the art can set the sealing sheet 4 to 2 to n pieces as needed; wherein any upper or lower side includes at least one sealing sheet 4.

[0020] A limiting device is provided on the inner wall of the valve body 1, which is used to limit the butterfly plate 2 to isolate the medium. The limiting device includes a limiting rubber block 6, a second fastener 5 and a connector 16; the connector 16 is a sheet structure, which is vertically fixed to the inner wall of the valve body 1 by welding; the limiting rubber block 6 is fixed to the side of the connector close to the butterfly plate 2 by the second fastener 5.

[0021] The butterfly plate 2 is formed by stamping / cutting a metal plate; a metal beam for enhancing the strength of the butterfly plate 2 is welded perpendicular to the rotating shaft 3 on the side of the butterfly plate 2 in contact with the medium; since the sealing sheet 4 is made of soft material, it will be deformed by the clamping of the butterfly plate 2, causing its diameter to increase, so that when the rotating shaft 3 rotates to drive the butterfly plate 2 to be in close contact with the limiting rubber block 6 (such as Figure 3 In (a), the periphery of the sealing sheet 4 held by the butterfly plate 2 fits tightly with the inside of the valve body 1; the sealing effect when isolating the medium is ensured through the form of soft and hard contact. Figure 3 In (b), the rotating shaft 3 drives the butterfly plate 2 away from the limit rubber block 6 to realize the conduction of the medium, and the conduction opening of the valve is controlled by controlling the distance between the limit butterfly plate 2 and the limit rubber block 6.

[0022] The side wall of the valve body 1 is provided with an axial hole, and a cylindrical axial groove extends outward from the axial hole on the outer wall, which is used to fix and limit the rotating shaft 3. The axial groove in the valve body 1 corresponding to the end of the rotating shaft 3 is closed by an end cover 10; the end cover 10 and the valve body 1 are fixed by a third fastener 11, and a sealing gasket 9 is sandwiched between the end cover 10 and the valve body 1 to achieve end closure and ensure that the medium does not leak out.

[0023] A transparent cover 14 is arranged on the top of the shaft groove in the valve body 1 corresponding to the device end of the rotating shaft 3; the rotating shaft 3 passes through the transparent cover 14 and is connected to an external device to realize the valve control function; the transparent cover 14 is fixedly connected to the shaft groove of the valve body 1 by a fourth fastener 15, and a sealing ring 13 and a sealing ring 12 are arranged between the rotating shaft 3 and the valve body 1 close to the transparent cover 14; the sealing ring 12 is a cylindrical rubber sleeve with a groove on the side, and the sealing ring 13 is a metal ring for fixing the sealing ring 12; the sealing is achieved by the combination of the sealing ring 12 and the sealing ring 13 to ensure that the medium does not leak out.

[0024] A self-lubricating bearing 8 is arranged between the shaft groove of the valve body 1 and the rotating shaft 3; the attached drawings of the present utility model only show one specification of the shaft sleeve, and the specific length and thickness of the shaft sleeve are selected according to actual needs.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A valve plate isolation mechanism of an isolation valve, characterized in that: It comprises a valve body (1), the side wall of the valve body (1) is a hollow cylinder, an axial hole is formed on the side wall, and a cylindrical axial groove extends outward from the axial hole on the side wall of the valve body (1) for fixing and limiting the rotation axis (3); The rotating shaft (3) is used to drive the butterfly plate (2) to rotate; one end of the rotating shaft (3) passes through a transparent cover (14) to be connected to an external device, and the transparent cover (14) is fixedly connected to the shaft groove on the valve body (1) via a fourth fastener (15); an end cover (10) is provided at the other end of the rotating shaft (3), and the end cover (10) is fixedly connected to the shaft groove on the valve body (1) via a third fastener (11); The butterfly plate (2) is used to isolate the medium; the butterfly plate (2) comprises two upper and lower circular metal plates having the same diameter as the inner wall of the valve body (1); the rotating shaft (3) is clamped between the upper and lower butterfly plates (2) by bolts, and is fixed to the rotating shaft (3) by a first fastener (7).

2. The valve plate isolation mechanism of the isolation valve according to claim 1, characterized in that: Circular soft sealing sheets (4) having the same diameter as the inner wall of the valve body (1) are respectively sandwiched between the upper and lower pieces of the butterfly plate (2) and the rotating shaft (3); the valve plate partition mechanism comprises more than two sealing sheets (4).

3. The valve plate isolation mechanism of the isolation valve according to claim 1, characterized in that: A self-lubricating bearing (8) is embedded between the shaft groove on the valve body (1) and the rotating shaft (3); a sealing gasket (9) is sandwiched between the end cover (10) and the valve body (1); a sealing ring (13) and a sealing ring (12) are provided between the rotating shaft (3) and the valve body (1) in close contact with the transparent cover (14); the sealing ring (12) is a cylindrical rubber sleeve with a groove on the side, and the sealing ring (13) is a metal ring used to fix the sealing ring (12).

4. The valve plate isolation mechanism of the isolation valve according to claim 1, characterized in that: The inner wall of the valve body (1) is provided with a connecting body (16) perpendicular to the inner wall of the valve body (1); the connecting body (16) fixes the limiting rubber block (6) on the side close to the butterfly plate (2) via a second fastener (5); when the limiting rubber block (6) is in close contact with the butterfly plate (2), the butterfly plate (2) and the inner wall of the valve body (1) are perpendicular.

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