Hydraulic check butterfly valve

Abstract

A valve plate is of a circular structure, a reinforcing rib and a cover plate are attached to the back face of the valve plate, an eccentric valve rod penetrates through the cover plate, and the two ends of the eccentric valve rod are connected with an executing mechanism and a valve body respectively. In the executing mechanism, an oil cylinder support carries an eccentric valve rod extending section, and a valve rod supporting sleeve and a shaft sleeve are arranged between the oil cylinder support and the eccentric valve rod extending section. The hydraulic oil cylinder is fixed on the top of the oil cylinder bracket; and an inner connecting rod is hinged with the heavy hammer rod. The counter weight rod is of a cross-shaped structure, one end is hinged to the eccentric valve rod through a connecting key, and a weight stack at the other end is fixed to the limiting plate. And an indicator is attached to the signaling switch box, is fixed on the valve rod supporting sleeve and is coaxial with the eccentric valve rod. According to the utility model, the weight stacks are adjustable, and the opening and closing speed is optimized with low cost; the hydraulic oil cylinder is arranged outside the movement range of the heavy hammer, so that the potential safety hazard of rapid falling of the heavy hammer caused by equipment aging is eliminated; the valve shaft and the center of the valve plate are non-collinear, the sealing face of the valve plate gradually makes contact along the inclined face of the valve seat during closing, linear sealing is formed, the sealing effect is remarkably improved, and abrasion is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, in particular to a hydraulic check butterfly valve. Background Art

[0002] The check butterfly valve is a special type of check valve that combines the functional characteristics of a butterfly valve and a check valve. This valve adopts a valve plate design, that is, there is a disc-shaped valve disc that rotates around the valve axis. When working normally, when the fluid flows along the direction of the valve disc opening, the valve plate opens under the action of fluid pressure to allow the medium to pass. When the fluid stops flowing or changes its flow direction and tries to flow back, the valve plate can close itself due to its own weight or the action of the built-in spring and the resistance generated by the reverse flow of the liquid to prevent the medium from flowing back. Traditional weight-type butterfly valves are difficult to control the opening and closing speed. In practical applications, the valve opening and closing speed often needs to be adjusted according to the medium and actual needs; and existing weight-type butterfly valves often set hydraulic or other drive devices under the weight. When the equipment has been in service for a long time and has problems such as aging, it is easy to cause the weight to damage the equipment again, causing additional losses; these problems have put forward new requirements for valves. Summary of the invention

[0003] The purpose of the embodiment of the utility model is to provide a hydraulic check butterfly valve to achieve adjustable valve plate closing speed and avoid potential safety hazards caused by the heavy hammer falling too fast.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is a hydraulic check butterfly valve, including a valve part and an actuator part, characterized in that the valve part includes a valve plate, the valve plate is a circular structure, an elastic gasket is arranged on the edge of the working surface of the valve plate, and is fixed by bolts, a sealing ring is arranged on the working surface of the valve plate close to the elastic gasket, and a pressure ring is clamped between the valve plate and the elastic gasket; a reinforcing rib is arranged on the back of the valve plate, and a cover plate is arranged on the reinforcing rib;

[0005] The valve part also includes a valve body and an eccentric valve stem, wherein the eccentric valve stem horizontally passes through the reinforcing ribs and extends to the outside of the valve body, and is fixed to the inner side of the cover plate through a fixing plate; one end of the eccentric valve stem passes through the valve body and extends to the actuator part, and an upper bearing seat is arranged outside the extension part of the eccentric valve stem between the actuator part and the valve body; the other end of the eccentric valve stem extends out of the valve body, and a bearing bottom cover is arranged on the top thereof, and the bearing bottom cover is connected to the valve body through a lower bearing seat;

[0006] The actuator part includes a cylinder bracket, the eccentric valve stem extension portion passes through the cylinder bracket and extends to the outer surface of the cylinder bracket, a C-shaped valve stem support sleeve is arranged between the end of the eccentric valve stem and the cylinder bracket, and a valve stem shaft sleeve is arranged between the valve stem support sleeve and the eccentric valve stem;

[0007] The actuator part also includes a hydraulic cylinder, a weight rod, a counterweight plate and a signaling switch box.

[0008] Furthermore, a valve seat is arranged at the top of the inner wall of the valve body, and the contact surface between the valve seat and the pressure ring is an inclined surface.

[0009] Furthermore, a limiting mechanism is provided on the inner wall of the valve body, and the distance from the working surface of the limiting structure to the center plane of the valve seat is equal to half the thickness of the valve plate.

[0010] Furthermore, the upper bearing seat and the lower bearing seat are arranged between the eccentric valve stem, the roller bearing is fixed by a bearing pressure cover, and oil seals are arranged at the connection between the lower bearing seat and the bearing bottom cover and the lower bearing seat and the actuator.

[0011] Furthermore, the signaling switch box includes an indicator, which is fixed to the valve stem support sleeve through a fixing frame, and the indicator is coaxial with the eccentric valve stem.

[0012] Furthermore, the hydraulic cylinder is fixed to the top of the cylinder bracket through the cylinder support sleeve and the cylinder sleeve, and the hydraulic connecting rod in the hydraulic cylinder passes through the cylinder bracket and is hinged to the rod part of the weight rod through a cylindrical pin, a gasket and a cotter pin.

[0013] Furthermore, the weight rod is a cross rod structure, one end of which is hinged to the eccentric valve stem, and a connecting key is provided on the contact surface between the weight rod and the eccentric valve stem; a counterweight plate is installed on the other end; a limit plate is provided at one end of the weight rod close to the counterweight plate relative to the rod body, and the plane of the limit plate is perpendicular to the axis of the weight rod, and the counterweight plate is fixed to the limit plate by passing through the weight rod through a pull rod bolt and a nut.

[0014] The beneficial effects of the utility model are:

[0015] The weight of the check butterfly valve counterweight of the utility model can be adjusted as needed to control the speed of valve opening and closing at a very low cost. The utility model sets the hydraulic cylinder and other devices outside the weight movement track to avoid equipment safety problems caused by the rapid fall of the weight rod due to equipment aging and failure. The center line of the valve shaft and the center line of the valve plate of the utility model do not overlap each other. When the valve is closed, the sealing surface of the valve plate will gradually contact and squeeze the valve seat. The valve plate does not radially cut into the valve seat, but slides along the inclined surface of the valve seat to achieve line sealing, which greatly enhances the sealing performance and reduces valve wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a front view of the hydraulic check butterfly valve of this embodiment.

[0018] Figure 2 It is a side view of the hydraulic check butterfly valve of this embodiment.

[0019] 1. Valve body; 2. Valve plate; 3. Limit mechanism; 4. Eccentric valve stem; 5. Upper bearing seat; 6. Cylinder bracket; 7. Hydraulic cylinder; 8. Cylinder support sleeve; 9. Cylinder sleeve; 10. Cylindrical pin; 11. Gasket; 12. Split pin; 13. Connecting key; 14. Valve stem sleeve; 15. Transmitting switch box; 16. Fixed frame; 17. Valve stem support sleeve; 18. Bearing cover; 19. Oil seal; 20. Pressure ring; 21. Sealing ring; 22. Weight rod; 23. Tie rod bolt; 24. Nut; 25. Counterweight; 26. Hydraulic connecting rod; 27. Lower bearing seat; 28. Bearing bottom cover; 29. ​​Limit plate; 30. Roller bearing; 31. Valve seat; 32. Indicator; 33. Elastic washer; 34. Reinforcement rib; 35. Cover plate; 36. Fixed plate. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figure 1~2 As shown, a hydraulic check butterfly valve disclosed in an embodiment of the utility model comprises a valve part and an actuator part; the valve part mainly comprises a valve plate 2, an eccentric valve stem 4, and a valve body 1.

[0022] An elastic gasket 33 is arranged at the edge of the working surface of the valve plate 2, and the elastic gasket 33 is fixed by bolts. A sealing ring 21 is arranged close to the elastic gasket 33, and a fixed pressure ring 20 is clamped between the valve plate 2 and the elastic gasket 33. A reinforcing rib 34 is arranged on the back of the valve plate 2, and the eccentric valve stem 4 passes through the reinforcing rib 34 and extends to both ends. A cover plate 35 is also welded on the reinforcing rib 34, and the eccentric valve stem 4 is fixed to the cover plate 35 through a fixing plate 36, so as to further improve the strength and protect the eccentric valve stem 4; one end of the eccentric valve stem 4 passes through the valve body 1 and extends to the actuator, and an upper bearing seat 5 is arranged outside the extended part, and the upper bearing seat 5 is also used to connect the actuator and the valve body 1, and the other end extends out of the valve body 1 and extends to the bearing bottom cover 28, and the bearing bottom cover 28 passes through the valve body 1. It is connected to the valve body 1 through the lower bearing seat 27; a limiting mechanism 3 is also arranged on the inner wall of the valve body 1, and the distance from the working surface of the limiting mechanism 3 to the central plane of the valve seat 31 is equal to half the thickness of the valve plate 2, so as to limit the valve plate 2 and realize medium isolation; a roller bearing 30 is arranged between the upper bearing seat 5 and the lower shaft bearing seat 27 and the eccentric valve stem 4, and is fixed by a bearing pressure cover 18, and an oil seal 19 is arranged at the connection between the lower bearing seat 27 and the bearing bottom cover 28 and the lower bearing seat 27 and the actuator to ensure sealing.

[0023] A valve seat 31 is arranged on the inner wall of the valve body, and the contact surface between the valve seat 31 and the pressure ring 20 is an inclined surface structure. When the valve plate 2 is closed, the pressure ring 20 slides along the inclined surface of the valve seat 31 to achieve line sealing.

[0024] The actuator mainly includes a cylinder bracket 6, a hydraulic cylinder 7, a signaling switch box 15, a weight rod 22, and a counterweight plate 25; the cylinder bracket 6 is connected to the valve body 1 through an upper bearing seat 5, and the extended part of the eccentric valve stem 4 passes through the cylinder bracket 6. A valve stem sleeve 14 is arranged between the cylinder bracket 6 and the end of the eccentric valve stem 4, and a valve stem support sleeve 17 is arranged outside the valve stem sleeve 14. The valve stem support sleeve 17 is a semicircular open structure, which is used to fix the valve stem sleeve 14 and limit the eccentric valve stem 4; the signaling switch box 15 is fixed on the valve stem support sleeve 17 through a fixing frame 16, and the signaling switch box also includes an indicator 32, which is coaxial with the eccentric valve stem 4. In this embodiment, the signaling switch box 15 monitors the operation of the valve throughout the whole process, and detects the position angle of the valve plate operation at any time through the indicator 32. At the same time, when quick closing is required, an electrical signal is sent to control the hydraulic cylinder 7 to achieve quick closing of the valve plate 2. In the present embodiment, the hydraulic cylinder 7 is driven by an electrical device, which may be a driving device including a motor, a hydraulic pump, a controller and other electrical units. As long as it can receive the electrical signal from the signaling switch box 15 and can control the driving of the hydraulic cylinder 7, the present invention is not limited thereto.

[0025] The hydraulic cylinder 7 is fixed to the top of the cylinder bracket 6 through the cylinder support sleeve 8 and the cylinder sleeve 9. The hydraulic connecting rod 26 in the hydraulic cylinder 7 passes through the cylinder bracket 6 and is hinged to the rod of the weight rod 22 through a cylindrical pin 10, a gasket 11 and a cotter pin 12; the weight rod 22 is a cross rod structure, one end of which is hinged to the eccentric valve stem 4, and a connecting key 13 is provided on the contact surface between the weight rod 22 and the eccentric valve stem 4 to drive the eccentric valve stem 4 to rotate; a limit plate 29 is provided near the other end of the weight rod 22, and the counterweight plate 25 passes through the weight rod 22 and is fixed to the limit plate 29 through a pull rod bolt 23 and a nut 24.

[0026] The specific working mode of the non-return butterfly valve described in the utility model is as follows: start the hydraulic pump, the hydraulic connecting rod 26 pushes the weight rod 22, and the eccentric valve stem 4 rotates under the drive of the weight rod 22, driving the valve plate 2 to rotate 90° and contact the limiter to open the valve. Start the hydraulic pump again, the eccentric valve stem 4 rotates, and under the action of the counterweight plate 25, the valve plate 2 will rotate 60° quickly, and then slowly rotate 30° until it is closed, so that the rapid closure of the valve is achieved under the action of the counterweight plate 25. At the same time, the rapid closure of the valve also has a certain cut-off effect on the fluid. In this embodiment, the number of counterweight plates 25 can be set as needed to achieve adjustable rotation speed of the valve plate 2; in this embodiment, the hydraulic cylinder 7 is set on the upper part of the cylinder bracket 6, avoiding the safety risk caused by the rapid fall of the weight rod 22 due to aging and failure of the equipment.

[0027] 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 hydraulic check butterfly valve, comprising a valve part and an actuator part, characterized in that: The valve part comprises a valve plate (2), the valve plate (2) being of a circular structure, an elastic gasket (33) being arranged at the edge of the working surface of the valve plate (2) and being fixed by bolts, a sealing ring (21) being arranged on the working surface of the valve plate (2) in close contact with the elastic gasket (33), and a pressure ring (20) being clamped between the valve plate (2) and the elastic gasket (33); a reinforcing rib (34) being arranged on the back side of the valve plate (2), and a cover plate (35) being arranged on the reinforcing rib (34); The valve part further comprises a valve body (1) and an eccentric valve stem (4); the eccentric valve stem (4) horizontally passes through the reinforcing rib (34) and extends to the outside of the valve body (1), and is fixed to the inner side of the cover plate (35) via a fixing plate (36); one end of the eccentric valve stem (4) passes through the valve body (1) and extends to the actuator part, and an upper bearing seat (5) is arranged outside the extension part of the eccentric valve stem (4) between the actuator part and the valve body (1); the other end of the eccentric valve stem (4) extends outside the valve body (1), and a bearing bottom cover (28) is arranged on the top of the eccentric valve stem, and the bearing bottom cover (28) is connected to the valve body (1) via a lower bearing seat (27); The actuator part comprises a cylinder support (6), the eccentric valve stem (4) extension portion passes through the cylinder support (6) and extends to the outer surface of the cylinder support (6), a C-shaped valve stem support sleeve (17) is arranged between the end of the eccentric valve stem (4) and the cylinder support (6), and a valve stem shaft sleeve (14) is arranged between the valve stem support sleeve (17) and the eccentric valve stem (4); The actuator part also includes a hydraulic cylinder (7), a weight rod (22), a counterweight plate (25) and a signaling switch box (15).

2. A hydraulic check butterfly valve according to claim 1, characterized in that: A valve seat (31) is provided at the top of the inner wall of the valve body (1), and the contact surface between the valve seat (31) and the pressure ring (20) is an inclined surface.

3. A hydraulic check butterfly valve according to any one of claims 1 or 2, characterized in that: A limiting mechanism (3) is provided on the inner wall of the valve body (1), and the distance between the working surface of the limiting mechanism and the central plane of the valve seat (31) is equal to half the thickness of the valve plate (2).

4. A hydraulic check butterfly valve according to any one of claims 1 or 2, characterized in that: A roller bearing (30) is arranged between the upper bearing seat (5), the lower bearing seat (27) and the eccentric valve stem (4); the roller bearing (30) is fixed by a bearing pressure cover (18), and an oil seal (19) is arranged at the connection between the lower bearing seat (27) and the bearing bottom cover (28) and the lower bearing seat (27) and the actuator.

5. A hydraulic check butterfly valve according to claim 1, characterized in that: The signaling switch box (15) comprises an indicator (32) which is fixed to the valve stem support sleeve (17) via a fixing frame (16); the indicator (32) is coaxial with the eccentric valve stem (4).

6. A hydraulic check butterfly valve according to claim 1, characterized in that: The hydraulic cylinder (7) is fixed to the top of the cylinder bracket (6) via a cylinder support sleeve (8) and a cylinder sleeve (9); a hydraulic connecting rod (26) in the hydraulic cylinder (7) passes through the cylinder bracket (6) and is hinged to the rod portion of the weight rod (22) via a cylindrical pin (10), a gasket (11) and a cotter pin (12).

7. A hydraulic check butterfly valve according to any one of claims 1 or 6, characterized in that: The weight rod (22) is a cross rod structure, one end of which is hinged to the eccentric valve rod (4), and a connecting key (13) is provided on the contact surface between the weight rod (22) and the eccentric valve rod (4); a counterweight plate (25) is installed on the other end; a limit plate (29) is provided at one end of the weight rod (22) close to the counterweight plate (25) relative to the rod body, the plane of the limit plate (29) is perpendicular to the axis of the weight rod (22), and the counterweight plate (25) is fixed on the limit plate (29) by means of a tie rod bolt (23) and a nut (24) passing through the weight rod (22).

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