Sealing butterfly valve with offset valve plate

Abstract

The utility model relates to the field of valves, and particularly discloses a valve plate offset type sealing butterfly valve which comprises a valve body, a valve plate is rotatably connected in the valve body, a valve shaft is arranged on the valve plate, a sealing bearing is installed on the valve body, the valve shaft penetrates through the sealing bearing, check rings are arranged at the positions, located on the two sides of the valve plate, in the valve body, and sealing gaskets are installed on the check rings. A mounting plate, a first pressing plate and a second pressing plate are mounted in the valve body and located above the sealing gasket, and elastic limiting pieces are mounted on the two sides of the mounting plate and located above the first pressing plate. The sealing bearing is arranged at the shaft neck, and the sealing structure is arranged on the bearing, so that a gap between the valve shaft and the valve body is reduced, and fluid is prevented from flowing out through the gap. By designing the first pressing plate, the second pressing plate, the elastic limiting piece and the mounting plate, the sealing gasket is tightly pressed on the check ring through the first pressing plate and the second pressing plate, and the sealing gasket is loosened through the first pressing plate and the second pressing plate by rotating a rotating rod on the mounting plate, so that the sealing gasket is conveniently replaced.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a valve plate offset type sealing butterfly valve. Background Art

[0002] Sealed butterfly valve is a valve used to control the flow of fluid. It has various types and structures and is suitable for different media and working conditions.

[0003] The sealing performance of a sealing butterfly valve is one of its most important characteristics, which determines whether the valve can effectively control the flow of fluid and prevent leakage. The sealing butterfly valve is installed with a sealing gasket on the retaining ring, and the sealing gasket fills the gap between the valve plate and the retaining ring to improve the sealing performance. However, the sealing ring will age after long-term use and needs to be replaced. Therefore, those skilled in the art provide a valve plate offset sealing butterfly valve to solve the problems raised in the above background technology. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a valve plate offset sealing butterfly valve, including a valve body, a valve plate is rotatably connected inside the valve body, a valve plate is provided on the valve plate, a sealing bearing is installed on the valve body, the valve shaft passes through the sealing bearing, retaining rings are provided on both sides of the valve plate inside the valve body, a sealing gasket is installed on the retaining ring, a mounting plate, a pressure plate 1 and a pressure plate 2 are installed above the sealing gasket inside the valve body, elastic limit members are installed on both sides of the mounting plate, and the elastic limit members are located above the pressure plate 1.

[0005] Preferably: a limit rod is fixedly connected to the interior of the valve body above the first pressure plate, a vertical rod is fixedly connected to the upper end of the first pressure plate, and the vertical rod is slidably connected to the limit rod.

[0006] Preferably: the mounting plate is rotatably connected to a rotating rod, one end of the rotating rod is fixedly connected to a cam, the mounting plate is slidably connected to the second pressing plate, an empty groove is provided above the second pressing plate, the cam is located inside the empty groove, and an elastic member is provided between the upper end of the second pressing plate and the upper end of the mounting plate.

[0007] Preferably, a connecting rope is connected between the other end of the rotating rod and the elastic limiting member, and one end of the elastic limiting member is located above one end of a portion of the pressing plate.

[0008] Preferably, a plurality of presser feet are fixedly connected to the first press plate and the second press plate.

[0009] Preferably, the retaining ring is semicircular and is symmetrical about the center of the valve body.

[0010] Preferably, the radius of the valve plate is larger than the radius of the hollow inner circle of the retaining ring and the sealing gasket, and the radius of the valve plate is smaller than the radius of the first pressing plate and the second pressing plate.

[0011] Technical effects and advantages of the utility model:

[0012] 1. The utility model is designed with a sealed bearing at the shaft neck and a sealing structure on the bearing, thereby reducing the gap between the valve shaft and the valve body to prevent the fluid from flowing out through the gap.

[0013] 2. The utility model is designed with a pressure plate 1, a pressure plate 2, an elastic limiter and a mounting plate. The sealing gasket is pressed against the retaining ring by the pressure plate 1 and the pressure plate 2. When the sealing gasket needs to be replaced, the sealing gasket can be loosened by rotating the rotating rod on the mounting plate, thereby facilitating the replacement of the sealing gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure provided by this application;

[0015] Figure 2 It is a schematic diagram of the structure when the valve plate provided by the present application is opened;

[0016] Figure 3 It is a structural schematic diagram of a pressing plate 1 provided in the present application;

[0017] Figure 4 This application provides Figure 3 A magnified view of middle;

[0018] Figure 5 This application provides Figure 3 Enlarged view of middle B;

[0019] Figure 6 It is a schematic diagram of the structure of the elastic member provided in this application;

[0020] In the figure:

[0021] 1. Valve body; 11. Sealing bearing; 2. Valve plate; 3. Retaining ring; 31. Sealing gasket; 32. Pressure plate 1; 33. Limit rod; 34. Elastic limit member; 35. Mounting plate; 36. Pressure plate 2; 37. Rotating rod; 38. Connecting rope; 39. Cam; 310. Elastic member. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figures 1 to 6In this embodiment, a valve plate offset sealing butterfly valve is provided, including a valve body 1, a valve plate 2 is rotatably connected inside the valve body 1, a valve plate 2 is provided on the valve plate 2, a sealing bearing 11 is installed on the valve body 1, the valve shaft passes through the sealing bearing 11, retaining rings 3 are provided on both sides of the valve plate 2 inside the valve body 1, a sealing gasket 31 is installed on the retaining ring 3, a mounting plate 35, a pressure plate 1 32 and a pressure plate 2 36 are installed above the sealing gasket 31 inside the valve body 1, elastic limit members 34 are installed on both sides of the mounting plate 35, and the elastic limit members 34 are located above the pressure plate 1 32.

[0024] When in use, the electric or pneumatic actuator can be directly connected to the drive valve shaft or a crank-connecting rod mechanism can be used to form a remote transmission, thereby driving the valve shaft to rotate. The valve plate 2 rotates through the valve shaft to change the state of the valve plate 2, thereby realizing the opening and closing state of the butterfly valve.

[0025] The valve plate is made into a hollow high-rigidity box-type structure, and the profile is used as a reinforced keel inside. When the valve plate is in the closed position, a mechanical sealing barrier is first formed on the flue cross-section surface, so that there is no internal leakage on both sides of the valve plate, ensuring the partition effect.

[0026] The inner side of the sealing gasket 31 is located between the retaining ring 3 and the valve plate 2 , so that the gap between the retaining ring 3 and the valve plate 2 is filled, thereby ensuring that the retaining ring 3 and the valve plate 2 are sealed.

[0027] When the sealing gasket 31 is aged, the valve plate 2 is opened, and the sealing gasket 31 can be loosened by the pressing plate 1 32 and the pressing plate 2 36 , so that the sealing gasket 31 can be replaced easily.

[0028] In further embodiments, see Figure 4 A limit rod 33 is fixedly connected to the interior of the valve body 1 above the pressure plate 1 32 , and a vertical rod is fixedly connected to the upper end of the pressure plate 1 32 , and the vertical rod is slidably connected to the limit rod 33 .

[0029] The vertical rod and the limit rod 33 slide up and down, thereby ensuring that the position and movement trajectory of the pressure plate 1 32 inside the valve body 1 are stable, and the sealing gasket 31 can be loosened by the pressure plate 1 32 rising.

[0030] In further embodiments, see Figures 5-6The mounting plate 35 is rotatably connected with a rotating rod 37, one end of which is fixedly connected with a cam 39. The mounting plate 35 is slidably connected with the second pressing plate 36. An empty slot is provided above the second pressing plate 36, and the cam 39 is located inside the empty slot. An elastic member 310 is provided between the upper end of the second pressing plate 36 and the upper end of the mounting plate 35. The rotating rod 37 rotates to drive the cam 39 to rotate, and the cam 39 rotates to push the second pressing plate 36 upward (the side of the cam 39 close to the rotation axis moves away from the upper part of the empty slot, and the side of the cam 39 far from the rotation axis moves to the lower part of the empty slot, thereby pushing up the second pressing plate 36), and the second pressing plate 36 loses the pressure on the sealing gasket 31.

[0031] In further embodiments, see Figures 5-6 A connecting cable 38 is connected between the other end of the rotating rod 37 and the elastic stopper 34, and one end of the elastic stopper 34 is located above one end of a portion of the pressure plate 1 32. When the rotating rod 37 rotates, the connecting cable 38 is pulled to rotate, one end of the connecting cable 38 is wound around the rotating rod 37, and the other end of the connecting cable 38 pulls the elastic stopper 34 to bend, and the portion of the elastic stopper 34 located above the pressure plate 1 32 is bent toward the inside of the valve body 1, thereby moving away from the pressure plate 1 32 located on the inner wall of the valve body 1, so that the pressure plate 1 32 loses the upward restriction, and can move upward and lose the pressure on the sealing gasket 31.

[0032] It should be noted that after the elastic limiter 34 is bent, it is necessary to ensure that the cam 39 lifts the second pressing plate 36 to ensure that there is no pressure on the sealing gasket 31, thereby ensuring that the sealing gasket 31 can be directly pulled out from under the first pressing plate 32 and the second pressing plate 36.

[0033] In further embodiments, see Figures 3 to 5 A plurality of presser feet are fixedly connected to the pressing plate 1 32 and the pressing plate 2 36. The sealing pad 31 is further fixed by the presser feet, and a groove is formed on the sealing pad 31 by the presser feet, so that the sealing pad 31 is positioned so that the sealing pad 31 will not shake.

[0034] In further embodiments, see Figures 1-2 The retaining ring 3 is semicircular and symmetrical about the center of the valve body 1. The retaining ring 3 seals the valve plate 2 from both sides to ensure that the valve plate 2 can be turned over 90 degrees.

[0035] In further embodiments, see Figures 1 to 4 The radius of the valve plate 2 is larger than the radius of the hollow inner circle of the retaining ring 3 and the sealing gasket 31, and the radius of the valve plate 2 is smaller than the radius of the first pressing plate 32 and the second pressing plate 36. It is ensured that the valve plate 2 can press on the sealing gasket 31 after rotation, but does not contact with the first pressing plate 32 and the second pressing plate 36, so as to ensure that the first pressing plate 32 and the second pressing plate 36 will not hinder the operation of the valve plate 2.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve plate offset sealing butterfly valve, comprising a valve body (1), characterized in that: The valve body (1) is rotatably connected to a valve plate (2), the valve plate (2) is provided with a valve shaft, a sealing bearing (11) is installed on the valve body (1), the valve shaft passes through the sealing bearing (11), a retaining ring (3) is provided on both sides of the valve plate (2) inside the valve body (1), a sealing gasket (31) is installed on the retaining ring (3), a mounting plate (35), a pressure plate 1 (32) and a pressure plate 2 (36) are installed above the sealing gasket (31) inside the valve body (1), elastic limit members (34) are installed on both sides of the mounting plate (35), and the elastic limit members (34) are located above the pressure plate 1 (32).

2. A valve plate offset sealing butterfly valve according to claim 1, characterized in that: A limiting rod (33) is fixedly connected inside the valve body (1) and located above the first pressing plate (32). A vertical rod is fixedly connected to the upper end of the first pressing plate (32). The vertical rod is slidably connected to the limiting rod (33).

3. A valve plate offset sealing butterfly valve according to claim 2, characterized in that: The mounting plate (35) is rotatably connected to a rotating rod (37), one end of which is fixedly connected to a cam (39). The mounting plate (35) is slidably connected to the second pressing plate (36), an empty groove is provided above the second pressing plate (36), the cam (39) is located inside the empty groove, and an elastic member (310) is provided between the upper end of the second pressing plate (36) and the upper end of the mounting plate (35).

4. A valve plate offset sealing butterfly valve according to claim 3, characterized in that: A connecting rope (38) is connected between the other end of the rotating rod (37) and the elastic limiting member (34), and one end of the elastic limiting member (34) is located above one end of a partial pressure plate (32).

5. The valve plate offset sealing butterfly valve according to claim 1, characterized in that: A plurality of presser feet are fixedly connected to the first press plate (32) and the second press plate (36).

6. The valve plate offset sealing butterfly valve according to claim 1, characterized in that: The retaining ring (3) is semicircular and is symmetrical about the center of the valve body (1).

7. The valve plate offset sealing butterfly valve according to claim 1, characterized in that: The radius of the valve plate (2) is greater than the radius of the hollow inner circle of the retaining ring (3) and the sealing gasket (31), and the radius of the valve plate (2) is smaller than the radius of the first pressure plate (32) and the second pressure plate (36).

Images