Four-connecting-rod light-load butterfly valve

Abstract

The utility model discloses a four-connecting-rod light-load butterfly valve which is characterized by further comprising a bearing which is arranged on a bearing seat and is eccentric with a valve body in the axial direction and the transverse direction, and a four-connecting-rod transmission mechanism arranged on the bearing. The valve plate seat is arranged on the valve body, is connected with the four-connecting-rod transmission structure and is detachable; the fixing ring is arranged on the valve body and is used for fixing the valve plate seat; through the arrangement of the eccentric bearing and the four-connecting-rod transmission mechanism, when the bearing rotates by about 10 degrees, the valve plate begins to translate and then rotate; when the bearing rotates by about 80 degrees in the reverse direction, the valve plate is driven to rotate and then move horizontally, when the valve plate makes plane contact with the valve seat 7 till pressing sealing is achieved, the valve is completely closed, the four-connecting-rod transmission mechanism has the lever stress application effect, the acting force between the valve plate and the valve seat can be increased when the valve is closed, the sealing tightness of the valve seat can be improved, and the service life of the valve is prolonged. The required opening and closing torque force can be effectively reduced, and the requirement on an executing mechanism is reduced; therefore, the weight of the butterfly valve is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically a four-link light-load butterfly valve. Background Technology

[0002] Butterfly valves are widely used in power plants, smelting, textile, glass, cement and other industries for frequent and rapid opening or shut-off of air, flue gas or coal gas in pipeline systems. They are suitable for large-diameter, high-flow, low-pressure differential, low-leakage and leak-free applications. Currently, traditional light-load butterfly valves on the market, whether open or seated, drive the valve shaft to rotate, which in turn drives the valve plate to rotate directly. This method results in high friction on the valve seat, increasing the opening and closing torque, which in turn increases the requirements for the actuator and the overall weight of the butterfly valve. At the same time, long-term friction leads to poor valve sealing performance. Moreover, the conical sealing method between the valve plate and the valve seat in traditional butterfly valves can easily cause the valve plate to get stuck on the valve seat when the valve body expands at high temperatures, and the machining precision requirements for the connection between the valve seat and the valve plate are high. Therefore, a four-link light-load butterfly valve is proposed. Utility Model Content

[0003] The main purpose of this utility model is to provide a solution that can effectively address the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a four-bar light-load butterfly valve, comprising a valve body component and an actuator connected to the valve body component. The valve body component includes a valve body, a valve plate movably connected to the sealing end of the valve body, bearing seats disposed at both ends of the valve body, a bracket disposed between the bearing seats and the actuator, and a valve seat disposed at one end of the valve body and connected to the valve plate. The valve body component is characterized by further including a bearing disposed on the bearing seat and eccentric to the valve body in both the axial and lateral directions, a four-bar transmission mechanism disposed on the bearing, a valve plate seat disposed on the valve body and detachably connected to the four-bar transmission mechanism, and a fixing ring disposed on the valve body for fixing the valve plate seat. The valve plate and the valve seat adopt a planar contact seal.

[0005] Preferably, the valve body is provided with a valve seat sleeve that is adapted to the valve plate seat, and the fixing ring connects the valve plate seat and the valve seat sleeve by bolts.

[0006] Preferably, the four-bar linkage includes a fixed rod with one end connected to the valve body and the other end connected to the bearing, a connecting rod with one end connected to the fixed rod and the other end connected to the valve plate seat, and a crank arm with one end connected to the bearing and the other end connected to the valve plate seat.

[0007] Preferably, the crank arm and valve plate seat are provided with a short shaft and a bushing disposed outside the short shaft.

[0008] Preferably, the connecting rod and valve plate seat and the connecting rod and fixed rod are provided with a short shaft II.

[0009] Preferably, the valve plate is provided with a sealing ring that connects to the valve seat.

[0010] Preferably, the valve seat is provided with a boss that connects to the sealing ring.

[0011] Preferably, the bearing housing is provided from bottom to bottom with a packing gasket, an energy storage seal ring, a retaining ring, and a stuffing box to increase the sealing performance between the bearing and the bearing housing.

[0012] Preferably, the stuffing box is provided with a pressure plate and an upper cover disposed on the pressure plate.

[0013] Preferably, the actuator can be a pneumatic hydraulic cylinder, an electric hydraulic cylinder, or a manual device.

[0014] This utility model has the following beneficial effects: Through the setting of the eccentric bearing and the four-bar linkage mechanism, when the bearing rotates approximately 10°, the valve plate first translates and then rotates; when the bearing rotates approximately 80° in the opposite direction, it drives the valve plate to first rotate and then translate. When the valve plate contacts the valve seat 7 plane until it is pressed tightly to seal, the valve is completely closed. The four-bar linkage mechanism also has a lever effect, which increases the force between the valve plate and the valve seat when the valve is closed. This improves the sealing tightness of the valve seat and effectively reduces the required opening and closing torque, thus reducing the requirements on the actuator and reducing the weight of the butterfly valve. By setting the valve plate seat as a detachable structure, it is easy to remove and repair or replace the valve plate seat after wear or damage. By using a planar contact between the valve plate and the valve seat, the valve plate can disengage from the sealing surface of the valve seat the moment it opens. At the same time, a radial gap of approximately 5mm is left between the valve plate and the valve body cavity, which can prevent expansion at high temperatures from causing the valve plate to jam, and also reduces the machining accuracy requirements of the valve plate and valve seat. Attached Figure Description

[0015] Figure 1 This is an overall front view of the present invention;

[0016] Figure 2 This is an overall top view of the present invention;

[0017] Figure 3 This is the overall left view of this utility model;

[0018] Figure 4 This is a partial view of the present invention;

[0019] Figure 5 This is a partial enlarged view of A of this utility model;

[0020] Figure 6 This is a partial enlarged view of B of this utility model.

[0021] Legend: 1. Valve body component; 2. Actuator; 3. Valve body; 4. Valve plate; 5. Bearing housing; 6. Bracket; 7. Valve seat; 8. Bearing; 9. Valve plate seat; 10. Retaining ring; 11. Valve seat sleeve; 12. Retaining rod; 13. Connecting rod; 14. Crank arm; 15. Short shaft one; 16. Bushing; 17. Short shaft two; 18. Sealing ring; 19. Boss; 20. Packing gasket; 21. Energy storage sealing ring; 22. Retaining ring; 23. Stuffing box; 24. Pressure plate; 25. Top cover. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] like Figure 1-6 As shown, a four-bar linkage light-load butterfly valve includes a valve body component 1 and an actuator 2 connected to the valve body component 1. The valve body component 1 includes a valve body 3, a valve plate 4 movably connected to the sealing end of the valve body 3, bearing seats 5 disposed at both ends of the valve body 3, a bracket 6 disposed between the bearing seats 5 and the actuator 2, and a valve seat 7 disposed at one end of the valve body 3 connected to the valve plate 4. The valve body 3 is characterized by further including a bearing 8 disposed on the bearing seat 5 and eccentrically to the valve body 3 axially and laterally, a four-bar linkage transmission mechanism disposed on the bearing 8, a valve plate seat 9 disposed on the valve body 3 and detachably connected to the four-bar linkage transmission mechanism, and a fixing ring 10 disposed on the valve body 3 for fixing the valve plate seat 9. The valve plate 4 and the valve seat 7 are sealed by planar contact. Through the eccentric bearing 8 and the four-bar linkage transmission mechanism, when the bearing 8 rotates approximately 10°, the valve plate 3 first translates and then rotates. When bearing 8 rotates approximately 80° in the opposite direction, it drives valve plate 3 to rotate first and then move horizontally. When valve plate 3 contacts the valve seat 7 plane until it is pressed tightly to seal, the valve is completely closed. The four-bar linkage mechanism has a lever effect, which can increase the force between valve plate 3 and valve seat 7 when the valve is closed. This can improve the sealing tightness of valve seat 7 and effectively reduce the required opening and closing torque force, thus reducing the requirements on the actuator and reducing the weight of the butterfly valve. By making valve plate seat 9 a detachable structure, it is easy to remove and repair or replace valve plate seat 9 after wear or damage. By making valve plate 4 and valve seat 7 in plane contact, valve plate 3 can disengage from the sealing surface of valve seat 7 the moment it is opened. At the same time, a radial gap of about 5mm is left between valve plate 4 and the inner cavity of valve body 3 to prevent valve plate 4 from getting stuck due to expansion at high temperature. It can also reduce the machining accuracy requirements of valve plate 4 and valve seat 7.

[0024] In one embodiment, the valve body 3 is provided with a valve seat sleeve 11 that is adapted to the valve plate seat 9, and the fixing ring 10 connects the valve plate seat 9 and the valve seat sleeve 11 by bolts.

[0025] In one embodiment, the four-bar linkage includes a fixed rod 12 connected at one end to the valve body 3 and at the other end to the bearing 8, a connecting rod 13 connected at one end to the fixed rod 12 and at the other end to the valve plate seat 9, and a crank arm 14 connected at one end to the bearing 8 and at the other end to the valve plate seat 9; the crank arm 14 and the valve plate seat 9 are provided with a short shaft 15 and a bushing 16 disposed outside the short shaft 15; the connecting rod 13 and the valve plate seat 9 and the connecting rod 13 and the fixed rod 12 are provided with a second short shaft 17.

[0026] In one embodiment, the valve plate 1 is provided with a sealing ring 18 connected to the valve seat 7; the valve plate 1 is provided with a sealing ring 18 connected to the valve seat 7, and the connection surface between the sealing ring 18 and the valve seat 7 is a plane; the valve seat 7 is provided with a boss 19 connected to the sealing ring 18.

[0027] In one embodiment, the bearing housing 5 is provided from bottom to bottom with a packing gasket 20, an energy storage sealing ring 21, a retaining ring 22, and a stuffing box 23 for increasing the sealing performance between the bearing 8 and the bearing housing 5; the stuffing box 23 is provided with a pressure plate 24 and an upper cover 25 provided on the pressure plate 24.

[0028] In one embodiment, the actuator 2 can be a pneumatic hydraulic cylinder, an electric hydraulic cylinder, or a manual device. When the actuator 2 is replaced with a pneumatic or electric hydraulic cylinder, the handle needs to be switched to the pneumatic slot before the butterfly valve can be operated by air or electricity. It is strictly forbidden to operate the butterfly valve pneumatically or electrically when the handle is in the manual slot or not in the pneumatic slot.

[0029] In use, this invention first drives the actuator 2, causing the bearing 8 to rotate. When the bearing 8 rotates about 10°, it drives the crank arm 14 and connecting rod 13 to rotate, causing the valve plate 4 to initially move horizontally and disengage from the valve seat 7. When the bearing 8 rotates about 80° in the opposite direction, it drives the crank arm 14 and connecting rod 13 to rotate in the opposite direction, causing the valve plate seat 9 to rotate the valve plate 4, thereby opening the valve. When the valve is closed, the actuator 2 drives the bearing 8 to rotate about 80°, causing the bearing 8 to drive the crank arm 14 and connecting rod 13 to rotate, causing the valve plate seat 9 to rotate the valve plate 4. When the bearing 8 rotates about 10° in the opposite direction, it drives the crank arm 14 and connecting rod 13 to rotate, causing the valve plate seat 9 to push the valve plate 4 towards the valve seat 7. The sealing ring 18 on the valve plate 4 contacts and seals with the boss 19 on the valve seat 7, thus closing the valve.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A four-bar light-load butterfly valve, comprising a valve body component (1) and an actuator (2) connected to the valve body component (1), wherein the valve body component (1) comprises a valve body (3), a valve plate (4) movably connected to the sealing end of the valve body (3), bearing seats (5) disposed at both ends of the valve body (3), a bracket (6) disposed between the bearing seats (5) and the actuator (2), and a valve seat (7) disposed at one end of the valve body (3) and connected to the valve plate (4), characterized in that: It also includes a bearing (8) that is eccentric to the valve body (3) in both the axial and lateral directions on the bearing seat (5), a four-bar linkage mechanism on the bearing (8), a valve plate seat (9) that is connected to the four-bar linkage mechanism and is detachable on the valve body (3), and a fixing ring (10) on the valve body (3) for fixing the valve plate seat (9). The valve plate (4) and the valve seat (7) are sealed by plane contact.

2. The four-link light-load butterfly valve according to claim 1, characterized in that: The valve body (3) is provided with a valve seat sleeve (11) that is adapted to the valve plate seat (9), and the fixing ring (10) connects the valve plate seat (9) and the valve seat sleeve (11) by bolts.

3. The four-link light-load butterfly valve according to claim 1, characterized in that: The four-bar linkage includes a fixed rod (12) with one end connected to the valve body (3) and the other end connected to the bearing (8), a connecting rod (13) with one end connected to the fixed rod (12) and the other end connected to the valve plate seat (9), and a crank arm (14) with one end connected to the bearing (8) and the other end connected to the valve plate seat (9).

4. A four-link light-load butterfly valve according to claim 3, characterized in that: The crank arm (14) and valve plate seat (9) are provided with a short shaft (15) and a bushing (16) disposed outside the short shaft (15).

5. A four-link light-load butterfly valve according to claim 3, characterized in that: The connecting rod (13) and valve plate seat (9) and the connecting rod (13) and fixed rod (12) are provided with short shaft two (17).

6. A four-link light-load butterfly valve according to claim 1, characterized in that: The valve plate (1) is provided with a sealing ring (18) that is connected to the valve seat (7).

7. A four-link light-load butterfly valve according to claim 6, characterized in that: The valve seat (7) is provided with a boss (19) that is connected to the sealing ring (18).

8. A four-link light-load butterfly valve according to claim 1, characterized in that: The bearing housing (5) is provided from bottom to bottom with a packing gasket (20), an energy storage seal ring (21), a retaining ring (22), and a stuffing box (23) to increase the sealing performance between the bearing (8) and the bearing housing (5).

9. A four-link light-load butterfly valve according to claim 8, characterized in that: The stuffing box (23) is provided with a pressure plate (24) and an upper cover (25) provided on the pressure plate (24).

10. A four-link light-load butterfly valve according to claim 1, characterized in that: The actuator (2) can be a pneumatic hydraulic cylinder, an electric hydraulic cylinder, or a manual device.

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