Box body modularization type pneumatic control actuator for valve

Abstract

The utility model discloses a box body modularized pneumatic control actuator for a valve, which comprises a box body, the box body is arranged on the outer side wall of a pipeline, a pneumatic valve is arranged on the pipeline, a valve rod of the pneumatic valve sequentially penetrates through the side wall of the pipeline and the side wall of the box body to extend into the box body, and a first bevel gear is coaxially arranged at the extending end of the valve rod. A second bevel gear meshed with the first bevel gear is arranged on one side of the first bevel gear, the second bevel gear is coaxially fixed to a transmission shaft arranged in the box body, the two ends of the transmission shaft are rotationally supported through bearing seats arranged on the two side walls of the box body, a shell is arranged on the outer side wall of the box body, and a piston cylinder is arranged at the bottom of the shell; a communicating hole is formed in the bottom of the shell and communicates an inner cavity of the shell with an inner cavity of the piston cylinder, a piston is arranged in the piston cylinder, the first end of the transmission shaft penetrates through the side wall of the box body, extends to the outside and is coaxially and fixedly connected with the rotating disc, and a positioning column is eccentrically arranged on the end face of the rotating disc. Automatic closing and manual closing of the pneumatic valve in the failure state can be achieved, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic valve control, in particular to a modular pneumatic control actuator for a valve box body. Background Art

[0002] Pneumatic valves include pneumatic ball valves, pneumatic butterfly valves, pneumatic air valves, pneumatic diaphragm valves, etc. Among them, the pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve. The pneumatic butterfly valve uses a circular butterfly plate that rotates with the valve stem for opening and closing to achieve the opening and closing action of the pneumatic valve. It is mainly used as a cut-off valve and can also be designed to have the function of regulation or both cut-off and regulation. The use of butterfly valves in low-pressure large and medium-diameter pipelines is increasing. Classification of pneumatic butterfly valves: stainless steel pneumatic butterfly valves, hard-sealed pneumatic butterfly valves, soft-sealed pneumatic butterfly valves, carbon steel pneumatic butterfly valves. The main advantages of pneumatic butterfly valves are simple structure, small size, light weight, and low cost. This feature is particularly significant for pneumatic butterfly valves. Installed in high-altitude dark passages, it is convenient to operate through a two-position five-way solenoid valve and can also regulate the flow medium. Air source and signal are the premise and foundation to ensure the smooth operation of pneumatic valves. When there is no air source for the positioner, the pressure reducing valve may malfunction, and in severe cases, it may even cause blockage of the filter and pipeline. In the pneumatic actuator of the existing pneumatic butterfly valve, the fork is a U-shaped open fork. After long-term use, the fork will have pits or even deform due to the collision of the rotating shaft, resulting in the falling off of the rotating shaft, the failure of the pneumatic valve to work, and the need to wait for the air source to recover and repair or replace the fork before continuing to perform the opening and closing function of the valve. The operation is cumbersome, time-consuming and laborious, with low reliability and low control accuracy. Summary of the Utility Model

[0003] The utility model provides a modular pneumatic control actuator for a valve box body, which solves the problems of low reliability and low control accuracy of the pneumatic control actuator when the traditional pneumatic valve fails.

[0004] The utility model provides a modular pneumatic control actuator for a valve box body, including a box body arranged on the outer side wall of a pipeline. A pneumatic valve is arranged on the pipeline. The valve stem of the pneumatic valve sequentially passes through the side wall of the pipeline and the side wall of the box body and extends into the box body. A first bevel gear is coaxially arranged at the extending end of the valve stem. A second bevel gear that can mesh with the first bevel gear is arranged on one side of the first bevel gear. The second bevel gear is coaxially fixed on a transmission shaft arranged in the box body. Both ends of the transmission shaft are rotatably supported by bearing seats arranged on both side walls of the box body. A housing is arranged on the outer side wall of the box body. A piston cylinder is arranged at the bottom of the housing. A communication hole is arranged at the bottom of the housing to connect the inner cavity of the housing with the inner cavity of the piston cylinder. A piston is arranged in the piston cylinder. The first end of the transmission shaft passes through the side wall of the box body and extends to the outside and is coaxially fixedly connected with a rotating disk. A positioning column is eccentrically arranged on the end face of the rotating disk. The positioning column is rotatably connected with one end of a connecting rod. The other end of the connecting rod passes through the communication hole and is inserted into the piston cylinder and is hinged to a hinge seat arranged on the piston.

[0005] In the above technical solution, further, an auxiliary air box is arranged at the bottom of the box body. The air supply port of the auxiliary air box is connected to the air inlet arranged at the bottom of the piston cylinder through an air supply pipe. An air supply control valve is arranged on the air supply pipe. An exhaust port is arranged at the bottom of the piston cylinder and an exhaust valve is arranged at the exhaust port.

[0006] In the above technical solution, further, the second end of the transmission shaft passes through the outer wall of the box body and extends to the outside and is suspended. A positioning rod is arranged radially on the outer wall of the second end of the transmission shaft. Two limiting columns are arranged on both sides of the positioning rod. The two limiting columns are respectively fixedly connected perpendicular to the side wall of the box body.

[0007] In the above technical solution, further, a threaded hole is arranged on the positioning rod, a positioning screw is arranged in the threaded hole, and positioning holes are arranged on the side wall of the box body on one side of each limiting column.

[0008] In the above technical solution, further, a hand wheel is arranged at the second end of the transmission shaft.

[0009] In the above technical solution, further, a maintenance opening is arranged on the side wall of the box body and a maintenance door is arranged at the maintenance opening.

[0010] As can be seen from the above technical solutions, the present utility model provides a modular pneumatic control actuator for a valve body.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. By driving the valve stem, the first bevel gear, the second bevel gear, the transmission shaft, the rotating disk, and the positioning column to rotate through the pneumatic valve, the connecting rod is driven to push the piston to move towards the bottom of the piston cylinder to compress the air in the piston cylinder. When the pneumatic valve fails or lacks air source support, the high-pressure gas in the piston cylinder pushes the piston to drive the piston cylinder to move outward. The movement of the piston cylinder drives the rotating disk, the second bevel gear, the first bevel gear, and the valve stem to rotate in the reverse direction through the positioning column, so that the pneumatic valve is quickly closed to block the fluid in the pipeline. It realizes that the pneumatic valve can be quickly and automatically closed under the conditions of failure and lack of air source support, with high reliability and high control precision.

[0013] 2. By opening the exhaust valve, the resistance brought by the pneumatic control actuator for opening the pneumatic valve can be reduced. By controlling the air supply pipe to supply gas to the piston cylinder through the air supply control valve, the efficiency of opening the valve is improved.

[0014] 3. By the hand wheel, it is convenient to drive the valve stem to manually close the pneumatic valve. By the positioning screw, the positioning rod can be fixedly connected to the side wall of the box body for positioning, preventing the transmission shaft from being driven by the valve stem to rotate and preventing the rotation position of the transmission shaft from deviating, realizing high-precision control and positioning of the pneumatic valve. Description of the Drawings

[0015] To more clearly illustrate the technical solution of the present utility model, the following will briefly introduce the attached drawings required in the implementation cases. Obviously, for those of ordinary skill in the art, without creative labor, other attached drawings can also be obtained based on these drawings.

[0016] Figure 1 Schematic diagram of the overall structure of a modular pneumatic control actuator for a valve box proposed by the present utility model;

[0017] Figure 2 Schematic diagram of the partial structure cross-section of a modular pneumatic control actuator for a valve box proposed by the present utility model;

[0018] Figure 3 Schematic diagram of the side view of the box structure of a modular pneumatic control actuator for a valve box proposed by the present utility model.

[0019] In the figure:

[0020] 1 - Box body; 11 - Bearing seat;

[0021] 2 - Pipeline;

[0022] 3 - Pneumatic valve; 31 - Valve stem; 32 - First bevel gear; 33 - Second bevel gear; 34 - Transmission shaft; 35 - Positioning rod; 36 - Limit post; 351 - Threaded hole; 352 - Positioning screw; 353 - Positioning hole;

[0023] 4 - Shell; 41 - Communication hole; 42 - Rotating disk; 43 - Positioning post; 44 - Connecting rod;

[0024] 5 - Piston cylinder; 51 - Piston; 52 - Hinge seat; 53 - Exhaust valve;

[0025] 6 - Handwheel;

[0026] 7 - Auxiliary air tank; 71 - Air supply pipe; 72 - Air supply control valve;

[0027] 8 - Inspection door. Specific implementation manner

[0028] In order to enable those in the technical field to better understand the technical solution in the present utility model, the following will clearly and completely describe the technical solution in the embodiments of the present utility model in conjunction with the attached drawings.

[0029] Embodiment 1:

[0030] See Figures 1-3, A modular pneumatic control actuator for a valve, comprising a housing 1 fixedly arranged at the bottom of the outer side wall of a pipeline 2. A pneumatic valve 3 is arranged on the pipeline 2. The valve stem 31 of the pneumatic valve 3 sequentially passes through the side wall of the pipeline 2 and the side wall of the housing 1 and extends into the housing 1. A first bevel gear 32 is coaxially arranged at the extending end of the valve stem 31. A second bevel gear 33 that can mesh with the first bevel gear 32 is arranged on one side of the first bevel gear 32. The second bevel gear 33 is coaxially fixed on a transmission shaft 34 arranged in the housing 1. The valve stem 31 is perpendicular to the transmission shaft 34. The first bevel gear 32 and the second bevel gear 33 are bevel gears with a 90-degree intersection angle. Both ends of the transmission shaft 34 are rotationally supported by bearing seats 11 arranged on the two side walls of the housing 1. A housing 4 is arranged on the outer side wall of the housing 1. A piston cylinder 5 is arranged at the bottom of the housing 4. A communication hole 41 is arranged at the bottom of the housing 4 to connect the inner cavity of the housing 4 with the inner cavity of the piston cylinder 5. A piston 51 is arranged in the piston cylinder 5. The first end of the transmission shaft 34 passes through the side wall of the housing 1 and extends to the outside and is coaxially fixedly connected with a rotating disk 42. A positioning column 43 is eccentrically arranged on the end face of the rotating disk 42. The positioning column 43 is rotationally connected with one end of a connecting rod 44. The other end of the connecting rod 44 passes through the communication hole 41 and is inserted into the piston cylinder 5 and is hinged to a hinge seat 52 arranged on the piston 51. By driving the valve stem 31 to rotate through the pneumatic valve 3, the first bevel gear 32 is driven to rotate and mesh with the second bevel gear 33 for transmission, driving the transmission shaft 34 to rotate. During the rotation of the transmission shaft 34, the rotating disk 42 is driven to rotate. The rotation of the rotating disk 42 drives the positioning column 43 to rotate. The positioning column 43 drives the connecting rod 44 to push the piston 51 to move towards the bottom of the piston cylinder 5 to compress the air in the piston cylinder 5. When the pneumatic valve 3 fails or lacks air source support, the high-pressure gas in the piston cylinder 5 pushes the piston 51 to drive the piston cylinder 5 to move outward. The movement of the piston cylinder 5 drives the rotating disk 42 to rotate through the positioning column 43. The rotation of the rotating disk 42 drives the second bevel gear 33 to mesh with the first bevel gear 32. The valve stem 31 rotates in the reverse direction to close the pneumatic valve 3 and block the fluid in the pipeline 2, realizing that the pneumatic valve 3 can automatically and quickly close under the conditions of failure and lack of air source support, with high reliability and high control accuracy.

[0031] As an improved implementation manner of this embodiment, refer to Figure 1 , 2, an auxiliary air tank 7 is provided at the bottom of the box body 1. High-pressure gas is stored in the auxiliary air tank 7. The air supply port of the auxiliary air tank 7 is connected to the air inlet provided at the bottom of the piston cylinder 5 through an air supply pipe 71. An air supply control valve 72 is provided on the air supply pipe 71. An exhaust port is provided at the bottom of the piston cylinder 5 and an exhaust valve 53 is provided at the exhaust port. When the fluid pressure in the pipeline 2 is too high, high-pressure gas is supplemented and provided to the piston cylinder 5 through the auxiliary air tank 7, which can increase the closing efficiency of the pneumatic valve 3 and increase the reliability of the pneumatic valve 3. When it is necessary to assist in closing the pneumatic valve 3, the air supply control valve 72 is opened. Of course, when it is necessary to open the pneumatic valve 3, the exhaust valve 53 can also be opened simultaneously to reduce the resistance brought by the pneumatic control actuator when opening the pneumatic valve 3. At the same time, the air supply control valve 72 is used to control the air supply pipe 71 to supply gas into the piston cylinder 5 to open the valve, increasing the reliability of the valve opening and closing.

[0032] In this embodiment, refer to Figure 1 、 2 , the second end of the transmission shaft 34 passes through the outer wall of the box body 1 and extends to the outside and is suspended. A positioning rod 35 is arranged radially on the outer wall of the second end of the transmission shaft 34. Two limit posts 36 are arranged on both sides of the positioning rod 35. The two limit posts 36 are respectively fixedly connected perpendicular to the side wall of the box body 1. It can be understood that when the transmission shaft 34 rotates a certain angle, the pneumatic valve 3 can be completely opened or completely closed. When the transmission shaft 34 rotates to the two angle boundaries, the positioning rod 35 installed on the transmission shaft 34 can be limited by the two limit posts 36 to prevent the rotation position of the transmission shaft 34 from deviating, realizing the high-precision control of the pneumatic valve 3.

[0033] In this embodiment, refer to Figure 1 、 2 , a threaded hole 351 is arranged on the positioning rod 35, and a positioning screw 352 is arranged in the threaded hole 351. A positioning hole 353 is arranged on the side wall of the box body 1 on one side of each limit post 36. The positioning rod 35 can be fixedly connected with the side wall of the box body 1 through the positioning screw 352 to prevent the transmission shaft 34 from being driven by the valve stem 31 to rotate.

[0034] In this embodiment, refer to Figure 1 、 3 , a hand wheel 6 is arranged at the second end of the transmission shaft 34. Through the hand wheel 6, it is convenient to drive the valve stem 31 to manually close the pneumatic valve 3.

[0035] In this embodiment, refer to Figure 3 , a maintenance opening is arranged on the side wall of the box body 1 and a maintenance door 8 is arranged at the maintenance opening. Through the maintenance door 8, it is convenient to maintain and repair the components inside the box body 1.

[0036] In this embodiment, refer to Figure 1 、 2 , the pneumatic valve 3 is an existing commercially available device, and the pneumatic valve 3 is a pneumatic butterfly valve.

[0037] As can be seen from the above technical solution, when in use, when the pneumatic valve 3 is not in effect, the valve stem 31 is rotated by the pneumatic valve 3, driving the first bevel gear 32 to rotate and mesh with the second bevel gear 33 for transmission, driving the transmission shaft 34 to rotate. During the rotation of the transmission shaft 34, the rotating disk 42 is driven to rotate. The rotation of the rotating disk 42 drives the positioning column 43 to rotate, and the positioning column 43 drives the connecting rod 44 to push the piston 51 to move towards the bottom of the piston cylinder 5 to compress the air in the piston cylinder 5. The pneumatic valve 3 is fully opened, enabling the fluid in the pipeline 2 to flow. When the pneumatic valve 3 fails or lacks air source support, the high-pressure gas in the piston cylinder 5 pushes the piston 51 to drive the piston cylinder 5 to move outward. The movement of the piston cylinder 5 drives the rotating disk 42 to rotate through the positioning column 43. The rotation of the rotating disk 42 drives the second bevel gear 33 to mesh with the first bevel gear 32, and the valve stem 31 rotates in the reverse direction to close the pneumatic valve 3 and block the fluid in the pipeline 2. Additionally, when the valve is not faulty and the pneumatic valve 3 needs to be opened, the exhaust valve 53 can also be opened simultaneously to reduce the resistance brought by the pneumatic control actuator when opening the pneumatic valve 3. When the valve is faulty and the pneumatic valve 3 needs to be closed, the air supply control valve 72 is used to control the air supply pipe 71 to supply gas into the piston cylinder 5, driving the piston 51 to drive the piston cylinder 5 to move outward to open the valve. The pneumatic valve 3 can also be manually closed by rotating the valve stem 31 through the handwheel 6.

[0038] Those skilled in the art will readily conceive of other embodiments of the present utility model after considering the specification and practicing the utility model disclosed herein. The present utility model is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present utility model and include common general knowledge or conventional technical means in the technical field not disclosed by the present utility model. The specification and embodiments are only to be regarded as exemplary, and the true scope of the present utility model is pointed out by the claims.

[0039] It should be understood that the present utility model is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model.

Claims

1. A modular pneumatic control actuator for a valve, characterized in that: It includes a box body (1) which is arranged on the outer side wall of a pipeline (2). An air-operated valve (3) is arranged on the pipeline (2). The valve stem (31) of the air-operated valve (3) sequentially passes through the side wall of the pipeline (2) and the side wall of the box body (1) and extends into the box body (1). A first bevel gear (32) is coaxially arranged at the extending end of the valve stem (31). A second bevel gear (33) which can be meshed with the first bevel gear (32) is arranged on one side of the first bevel gear (32). The second bevel gear (33) is coaxially fixed on a transmission shaft (34) arranged in the box body (1). Both ends of the transmission shaft (34) are rotationally supported by bearing seats (11) arranged on the two side walls of the box body (1). A shell (4) is arranged on the outer side wall of the box body (1). A piston cylinder (5) is arranged at the bottom of the shell (4). A communication hole (41) is arranged at the bottom of the shell (4) to connect the inner cavity of the shell (4) with the inner cavity of the piston cylinder (5). A piston (51) is arranged in the piston cylinder (5). The first end of the transmission shaft (34) passes through the side wall of the box body (1) and extends to the outside and is coaxially and fixedly connected with a rotating disk (42). A positioning column (43) is eccentrically arranged on the end face of the rotating disk (42). The positioning column (43) is rotationally connected with one end of a connecting rod (44). The other end of the connecting rod (44) passes through the communication hole (41) and inserts into the piston cylinder (5) and is hinged with a hinge seat (52) arranged on the piston (51).

2. The modular pneumatic control actuator for a valve box according to claim 1, wherein An auxiliary air box (7) is arranged at the bottom of the box body (1). The air supply port of the auxiliary air box (7) is connected with the air inlet arranged at the bottom of the piston cylinder (5) through an air supply pipe (71). An air supply control valve (72) is arranged on the air supply pipe (71). An exhaust port is arranged at the bottom of the piston cylinder (5) and an exhaust valve (53) is arranged at the exhaust port.

3. The modular pneumatic control actuator for a valve body according to claim 1, characterized in that, The second end of the transmission shaft (34) passes through the outer wall of the box body (1) and extends to the outside and is suspended. A positioning rod (35) is arranged on the outer wall of the second end of the transmission shaft (34) along the radial direction. Two limiting columns (36) are arranged on both sides of the positioning rod (35). The two limiting columns (36) are respectively vertically and fixedly connected with the side wall of the box body (1).

4. A modular pneumatic control actuator for a valve box according to claim 3, characterized in that, A threaded hole (351) is arranged on the positioning rod (35). A positioning screw (352) is arranged in the threaded hole (351). A positioning hole (353) is arranged on the side wall of the box body (1) on one side of each limiting column (36).

5. The modular pneumatic control actuator for a valve box according to claim 3, characterized in that, A hand wheel (6) is arranged at the second end of the transmission shaft (34).

6. The modular pneumatic control actuator for a valve box according to claim 4, characterized in that, An inspection opening is arranged on the side wall of the box body (1) and an inspection door (8) is arranged at the inspection opening.

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