Pneumatic actuating mechanism of high-pressure bypass valve

Abstract

The utility model relates to the technical field of pneumatic actuating mechanisms of valves, in particular to a pneumatic actuating mechanism of a high-pressure bypass valve, which comprises a shell, a control shaft rotatably arranged in the shell, a worm gear fixed on the side surface of the control shaft, and a worm meshed with the worm gear rotatably arranged on one side of the worm gear on the inner side of the shell in a limiting manner. Protective frames are fixed to the two sides of the shell and located at the two ends of the worm, gears are fixed to the two ends of the worm and located in the protective frames, piston plates are arranged on the inner sides of the protective frames and located on the two sides of the gears, racks meshed with the gears are fixed to one sides of the piston plates, and two air channels are formed in the shell. The high-pressure bypass valve solves the problems that when a pneumatic executing mechanism in an existing high-pressure bypass valve controls a valve body to rotate, the valve body corresponds fast, pressure fluctuation on the two sides of the valve body in a pipeline is large, pipeline safety is affected, rotation resistance of the valve body is large, teeth are impacted to a certain degree, and the service life of the valve body is prolonged. The problem that normal control of the rack is affected due to the fact that the two pistons receive air pressure at different times due to asymmetry of the air conveying pipelines is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pneumatic actuator of valve, concretely refers to a high pressure bypass valve pneumatic actuator. BACKGROUND

[0002] Pneumatic actuator is mainly used for controlling various types of valves in low pressure pipeline, such as ball valve, butterfly valve etc.;Low pressure valve pneumatic actuator is usually composed of cylinder, piston, rack, gear etc. parts. Among them, the cylinder is the main part of the actuator, which is used to provide power. The piston reciprocates in the cylinder, and the power is transmitted to the valve through the rack and gear.;

[0003] The existing pneumatic actuator fills gas into the inflation cavity through the gas conveying channel, so as to drive the piston to move, so as to drive the rack to move, so as to drive the gear to rotate. Because high pressure bypass valve is often used in high pressure pipeline, it is difficult to turn the valve, so the gas in the pneumatic actuator directly drives the rack to rotate, which has a large impact on the gear teeth, and the valve rotates quickly, which easily leads to large pressure fluctuation on both sides of the valve in the pipeline, affecting the safety of the pipeline, and the gas conveying pipeline in the existing pneumatic actuator is generally not symmetrical, which will make the two pistons receive gas pressure at different times, thus affecting the normal control of the rack. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem that the existing pneumatic actuator in high pressure bypass valve controls the valve body to rotate, which makes the valve body rotate quickly, leads to large pressure fluctuation on both sides of the valve in the pipeline, affects the safety of the pipeline, and because the pressure in the pipeline is large, the valve body has large rotating resistance, which will impact the gear teeth, and the asymmetric gas conveying pipeline in the pneumatic actuator will make the two pistons receive gas pressure at different times, thus affecting the normal control of the rack.

[0005] To solve the above problems, the utility model adopts the technical scheme of a kind of high pressure bypass valve pneumatic actuator, including shell, control shaft is rotatably arranged in the shell, worm wheel is fixed on the side surface of control shaft, worm is rotatably arranged in the shell and located on one side of worm wheel, and worm wheel is engaged with worm, protective frame is fixed on both ends of worm in the shell, gear is fixed on both ends of worm in the protective frame, piston plate is arranged on both sides of gear in the protective frame, rack is fixed on one side of piston plate and engaged with gear, and two gas passages are arranged in the shell.

[0006] As a further scheme of the utility model, the inside of the protective frame is divided into inflation cavity and back gas cavity by two piston plates, which are used to control the left and right movement of piston plate.

[0007] As a further scheme of the utility model: two air passages are respectively air charging passage and air returning passage, the air charging passage is communicated with the air charging cavity, the air returning passage is communicated with the air returning cavity, and the air charging cavity and the air returning cavity can be respectively inflated.

[0008] As a further scheme of the utility model: the upside of the air charging passage and the air returning passage is located above the middle part of the shell and is provided with an air port, which is communicated with the external air pump, and the air charging passage and the air returning passage are symmetrically provided relative to the air port, so that the time of gas reaching the piston plate is the same.

[0009] As a further scheme of the utility model: the bottom end of the control shaft is fixedly provided with a valve connecting bayonet, which is connected with the valve.

[0010] As a further scheme of the utility model: the length of the rack is equal to the difference between the length of the inner side of the protection frame and the length of the piston plate, so as to facilitate the rotation of the worm.

[0011] Compared with the prior art, the utility model has the advantages that the worm gear meshing structure is added, the control shaft can rotate stably and slowly, and the two air passages are symmetrically arranged relative to the air port, so that the time of gas reaching the piston plate is the same. BRIEF DESCRIPTION OF DRAWINGS

[0012] The drawings are used to provide a further understanding of the utility model and constitute a part of the specification, which is used to explain the utility model together with the embodiments of the utility model and does not constitute a limitation on the utility model. In the drawings:

[0013] Figure 1 It is an overall structure perspective view of the utility model of a high-pressure bypass valve pneumatic actuator.

[0014] Figure 2 It is an overall structure sectional view of the utility model of a high-pressure bypass valve pneumatic actuator.

[0015] Figure 3 It is an air returning passage schematic view of the utility model of a high-pressure bypass valve pneumatic actuator.

[0016] Figure 4 It is an air charging passage schematic view of the utility model of a high-pressure bypass valve pneumatic actuator.

[0017] In the drawings:

[0018] 1, shell; 2, control shaft; 3, worm gear; 4, worm; 5, protection frame; 6, gear; 7, piston plate; 8, rack; 1.1, air charging passage; 1.2, air returning passage; 5.1, air charging cavity; 5.2, air returning cavity. PREFERRED EMBODIMENT

[0019] The technical solutions in the embodiments of the present utility model will be apparently and completely described in the embodiments of the present utility model in combination with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of protection of the present utility model.

[0020] The present utility model provides a technical scheme: in order to solve the existing problems raised in the background art.

[0021] In combination with the drawings Figures 1-2 It can be known that the shell 1 is internally rotatably provided with a control shaft 2, the control shaft 2 is fixedly provided with a worm wheel 3 on the side surface, the inside of the shell 1 is rotatably provided with a worm 4 meshing with the worm wheel 3 beside the worm wheel 3, the shell 1 is fixedly provided with a protective frame 5 on both sides at both ends of the worm 4, the worm 4 is fixedly provided with a gear 6 at both ends in the protective frame 5, the inside of the protective frame 5 is provided with a piston plate 7 beside the gear 6, the piston plate 7 is fixedly provided with a rack 8 meshing with the gear 6 on one side, the inside of the shell 1 is provided with two air channels, the piston plate 7 divides the inside of the protective frame 5 into an inflation cavity 5.1 and a return cavity 5.2, which are respectively used for controlling the left and right movements of the piston plate 7, the bottom end of the control shaft 2 is fixedly provided with a valve connecting bayonet, which is connected with a valve, the length of the rack 8 is equal to the difference between the length of the inside of the protective frame 5 and the length of the piston plate 7, which facilitates rotating the worm 4;

[0022] In combination with the drawings Figure 3 , 4 It can be known that the two air channels are respectively an inflation air channel 1.1 and a return air channel 1.2, the inflation air channel 1.1 is communicated with the inflation cavity 5.1, the return air channel 1.2 is communicated with the return cavity 5.2, which can respectively inflate the inflation cavity 5.1 and the return cavity 5.2, the upper side of the inflation air channel 1.1 and the return air channel 1.2 is provided with an air port above the middle of the shell 1, which is communicated with an external air pump, and the inflation air channel 1.1 and the return air channel 1.2 are symmetrically provided with respect to the air port, which can make the time of gas reaching the piston plate be the same.

[0023] The working principle of the present application is that when the valve is controlled, the external air pump inflates the air port communicated with the inflation air channel 1.1, the gas enters the inflation cavity 5.1 along the inflation air channel 1.1, after the inflation cavity 5.1 is filled with gas, the piston plate 7 is pushed to move away from the gear 6, which in turn drives the rack 8 to move, the movement of the rack 8 drives the gear 6 to rotate, which in turn controls the rotation of the worm 4, thereby driving the rotation of the worm wheel 3 and the control shaft 2;

[0024] The gas is filled into the air port connected with the gas return channel 1.2 by an external air pump, and the gas will enter the gas return cavity 5.2 along the gas return channel 1.2; after the gas return cavity 5.2 is filled with gas, the piston plate 7 is pushed to move towards the gear 6, and then the rack 8 is driven to move, the rack 8 moves to drive the gear 6 to rotate, and then the rotation of the worm 4 is controlled, so as to drive the worm wheel 3 and the control shaft 2 to rotate;

[0025] The gas is filled into the air port connected with the gas return channel 1.2 by an external air pump, and the gas will enter the gas return cavity 5.2 along the gas return channel 1.2; after the gas return cavity 5.2 is filled with gas, the piston plate 7 is pushed to move towards the gear 6, and then the rack 8 is driven to move, the rack 8 moves to drive the gear 6 to rotate, and then the rotation of the worm 4 is controlled, so as to drive the worm wheel 3 and the control shaft 2 to rotate;

[0026] The above describes the utility model and its implementation mode, and the description is not restrictive, and the embodiment shown in the drawings is only one of the embodiments of the utility model, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired thereby, without departing from the creative purpose of the utility model, similar structural modes and embodiments are not creatively designed, which should belong to the protection scope of the utility model.

Claims

1. A high pressure bypass valve pneumatic actuator comprising a housing (1), characterized in that: The control shaft (2) is arranged inside the shell (1) and rotates, the worm gear (3) is fixed on the side of the control shaft (2), the worm (4) is arranged beside the worm gear (3) and rotates in the shell (1), the protective frame (5) is fixed on both sides of the worm (4) and located at both ends of the shell (1), the gear (6) is fixed on both ends of the worm (4) and located in the protective frame (5), the piston plate (7) is arranged on the inner side of the protective frame (5) and located beside the gear (6), the rack (8) is fixed on one side of the piston plate (7) and engaged with the gear (6), and two air channels are arranged in the shell (1).

2. The high pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The two piston plates (7) divide the inner side of the protective frame (5) into the inflation cavity (5.1) and the return cavity (5.2).

3. The high pressure bypass valve pneumatic actuator according to claim 1, wherein: The two air channels are the inflation air channel (1.1) and the return air channel (1.2), the inflation air channel (1.1) is communicated with the inflation cavity (5.1), and the return air channel (1.2) is communicated with the return cavity (5.2).

4. The high pressure bypass valve pneumatic actuator according to claim 3, wherein: The inflation air channel (1.1) and the return air channel (1.2) are symmetrically arranged on the upper side of the shell (1) and located above the middle part of the shell (1).

5. The high pressure bypass valve pneumatic actuator according to claim 1, wherein: The control shaft (2) is fixed with the valve connecting bayonet at the bottom end.

6. A high pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The length of the rack (8) is equal to the difference between the length of the inner side of the protective frame (5) and the length of the piston plate (7).

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