Pneumatic actuating mechanism of low-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 low-pressure bypass valve, which comprises a shell, two ends of the shell are fixedly provided with sealing covers through bolts, one side of each sealing cover is provided with an air return cavity, a control shaft is rotatably arranged in the middle of the inner side of the shell, and piston plates are slidably arranged on the inner side of the shell and close to the two ends. A connecting plate is fixed to the position, located beside the control shaft, of one side of the piston plate, partition plates are fixed to the positions, located on the two sides of the control shaft, of the inner side of the shell and divide the interior of the shell into three areas, the area where the control shaft is located is a closed meshing area, the area where the piston plate is located is an inflation cavity, and cavities are formed in the piston plate and the connecting plate. Two air channels are formed in the shell, and an air conveying hole is formed in the side face of each air channel. The pneumatic actuating mechanism solves the problems that after an existing pneumatic actuating mechanism is used for a long time, a gear and a rack inside the pneumatic actuating mechanism are prone to being corroded by input gas, and normal use is affected.

Description

TECHNICAL FIELD

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

[0002] The pneumatic actuator is mainly used for controlling various types of valves in low pressure pipeline, such as ball valve, butterfly valve etc.;The 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 air into the air chamber through the air supply channel, so as to drive the piston to move, drive the rack to move, and drive the gear to rotate, control the opening and closing of the valve. However, because the gear and the rack are directly exposed in the air chamber, the surface of the gear and the rack will be in direct contact with the input air. Although the input air has been cleaned, the surface of the gear and the rack will still be corroded to different degrees after long time use. SUMMARY

[0004] The technical problem to be solved by the utility model is that the internal gear and rack of the existing pneumatic actuator are easily corroded by the input gas after long time use, which affects normal use.

[0005] To solve the above problems, the utility model adopts the technical scheme of a low pressure bypass valve pneumatic actuator, which comprises a shell, sealing covers are fixed on both ends of the shell through bolts, a back gas chamber is formed on one side of the sealing cover, a control shaft is rotatably arranged in the middle of the inner side of the shell, a piston plate is slidably arranged on the inner side of the shell near both ends, a connecting plate is fixed on one side of the piston plate beside the control shaft, a partition plate is fixed on both sides of the control shaft in the inner side of the shell, the partition plate divides the inner side of the shell into three areas, the area where the control shaft is located is a closed meshing area, the area where the piston plate is located is an air chamber, cavities are formed in the inner sides of the piston plate and the connecting plate, two gas channels are formed in the shell, and gas holes are formed in the sides of each gas channel.

[0006] As a further scheme of the utility model, the two gas channels are respectively a gas filling channel connected with the air chamber and a back gas channel connected with the back gas chamber. When filling air, the air chamber is filled with gas through the gas filling channel, so as to drive the piston plate to move towards both ends of the shell. When filling air into the back gas chamber through the back gas channel, the piston plate can be driven to move towards the middle of the shell.

[0007] As a further scheme of the utility model, a gear slot is formed in the side surface of the control shaft, and the side surfaces of the two connecting plates are fixed with gear teeth meshing with the gear slot. Through the movement of the connecting plates, the control shaft can be driven to rotate.

[0008] As a further scheme of the utility model: the arc-shaped slot is arranged at the middle part of one side of the partition plate and at the control shaft, and the through hole is arranged at the connecting plate, and the shape of the through hole is same with the cross section of the connecting plate, so that the connecting plate can pass through the sliding.

[0009] As a further scheme of the utility model: the distance between the two partition plates is greater than the length of the connecting plate, so that the tooth groove and the teeth can be engaged all the way.

[0010] As a further scheme of the utility model: the ring groove is arranged at the outer side of the piston plate, and the sealing sleeve ring is sleeved in the ring groove, which is used for sealing and preventing air leakage between the inflation cavity and the back gas cavity.

[0011] Compared with the prior art, the utility model has the advantages that the partition plate structure is added, the inside of the shell is divided into three areas, the tooth groove and tooth engagement area are divided from the inflation area, so that the corrosion of the input gas to the surface of the tooth groove and tooth is reduced as much as possible, and the service life of the starting execution mechanism is increased. BRIEF DESCRIPTION OF DRAWINGS

[0012] The drawings are used to provide 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 the limitation to the utility model. In the drawings:

[0013] Figure 1 It is the inside structure schematic diagram of the shell in the low pressure bypass valve pneumatic execution mechanism of the utility model.

[0014] Figure 2 It is the overall structure perspective view in the low pressure bypass valve pneumatic execution mechanism of the utility model.

[0015] Figure 3 It is the inflation channel schematic view in the low pressure bypass valve pneumatic execution mechanism of the utility model.

[0016] Figure 4 It is the back gas channel schematic view in the low pressure bypass valve pneumatic execution mechanism of the utility model.

[0017] In the drawings:

[0018] 1, shell;2, sealing cover;3, control shaft;4, piston plate;5, connecting plate;6, partition plate;7, cavity;8, gas channel;1.1, closed engagement area;1.2, inflation cavity;1.3, air hole;1.4, inflation channel;1.5, back gas channel;2.1, back gas cavity;3.1, tooth groove;4.1, ring groove;5.1, teeth;6.1, arc-shaped slot;6.2, through hole. PREFERRED EMBODIMENT

[0019] Clearly, the described embodiments are merely a 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 person skilled in the art without creative labor fall within the protection scope 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] The accompanying drawings are combined Figures 1-4 It can be known that the utility model discloses a shell 1, the both ends of shell 1 are fixed with sealing cover 2 through bolt, the one side of sealing cover 2 is equipped with back gas cavity 2.1, the inside middle part of shell 1 is rotatably equipped with control shaft 3, the bottom end of control shaft 3 is fixed with valve body, the inside of shell 1 is slidably equipped with piston plate 4 near both ends, piston plate 4 moves and can drive connecting plate 5 to move, the outside of piston plate 4 is equipped with annular groove 4.1, annular groove 4.1 is equipped with sealing sleeve ring, is used for sealing, prevents the air leakage between inflation cavity 1.2 and back gas cavity 2.1, the one side of piston plate 4 is fixed with connecting plate 5 near control shaft 3, the side of control shaft 3 is equipped with gear slot 3.1, the side of two connecting plates 5 is fixed with gear tooth 5.1 meshing with gear slot 3.1, through connecting plate 5 movement, can drive control shaft 3 to rotate, the inside of shell 1 is fixed with baffle 6 near control shaft 3, baffle 6 divides the inside of shell 1 into three areas, the area where control shaft 3 is located is closed engagement area 1.1, the area where piston plate 4 is located is inflation cavity 1.2, the inside of piston plate 4 and connecting plate 5 is equipped with cavity 7, can reduce the weight of piston plate 4 and connecting plate 5, thereby reducing the weight of the whole mechanism, the middle part of the one side of baffle 6 is equipped with arc-shaped groove 6.1 at control shaft 3, baffle 6 is equipped with through hole 6.2 at connecting plate 5, the shape of through hole 6.2 is same with the cross section of connecting plate 5, so as to facilitate connecting plate 5 to slide through, the distance between two baffles 6 is greater than the length of connecting plate 5, facilitating the gear slot 3.1 and gear tooth 5.1 to be engaged throughout the process;

[0022] The inside of shell 1 is equipped with two air passages, the side of each air passage is equipped with air hole 1.3, two air passages are respectively inflation passage 1.4 and back gas passage 1.5, which are communicated with inflation cavity 1.2 and back gas cavity 2.1 respectively, when inflating, inflation cavity 1.2 is filled with gas through inflation passage 1.4, so as to drive piston plate 4 to move towards both ends of shell 1, and when inflating back gas cavity 2.1 through back gas passage 1.5, piston plate 4 can be driven to move towards the middle of shell 1.

[0023] The working principle of the present application is that when the valve is controlled, the air hole 1.3 connected with the air charging channel 1.4 is filled with air by an external air pump, the air will enter the air charging cavity 1.2 along the air charging channel 1.4, after the air charging cavity 1.2 is filled with air, the piston plate 4 will be pushed to move to both ends of the shell 1, and then the connecting plate 5 will be moved, because the gear slot 3.1 is engaged with the gear tooth 5.1, so the movement of the connecting plate 5 will drive the control shaft 3 to rotate, and then the valve is controlled to rotate;

[0024] The air hole 1.3 connected with the air charging channel 1.4 is filled with air by an external air pump, the air will enter the air charging cavity 1.2 along the air charging channel 1.4, after the air charging cavity 1.2 is filled with air, the piston plate 4 will be pushed to move to both ends of the shell 1, and then the connecting plate 5 will be moved, because the gear slot 3.1 is engaged with the gear tooth 5.1, so the movement of the connecting plate 5 will drive the control shaft 3 to rotate, and then the valve is controlled to rotate;

[0025] By filling the air charging cavity 1.2 or the air charging cavity 2.1 with air, the piston plate 4 is controlled to move, and then the connecting plate 5 drives the control shaft 3 to rotate, so that the opening and closing of the valve is realized.

[0026] The above describes the present application and its embodiments, which is not restrictive, and the drawings shown are only one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, if a person skilled in the art is inspired by it, without departing from the creative purpose of the present application, without creative design, similar structure and embodiments of the technical scheme can be designed, which should belong to the protection scope of the present application.

Claims

1. A low-pressure bypass valve pneumatic actuator, comprising a shell (1), both ends of the shell (1) are fixed with sealing covers (2) through bolts, one side of the sealing cover (2) is provided with a return air cavity (2.1), and a control shaft (3) is rotatably arranged at the middle of the inner side of the shell (1), characterized in that: The piston plate (4) is slidably arranged in the shell (1) near both ends, one side of the piston plate (4) is fixed with a connecting plate (5) beside the control shaft (3), the shell (1) is fixed with a partition plate (6) beside the control shaft (3), the partition plate (6) divides the shell (1) into three areas, the area where the control shaft (3) is located is a closed engagement area (1.1), the area where the piston plate (4) is located is an inflation cavity (1.2), the piston plate (4) and the connecting plate (5) are both internally provided with cavities (7), and the shell (1) is internally provided with two air channels, and each air channel is provided with an air hole (1.3) on the side surface.

2. A low pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The two air channels are an inflation channel (1.4) in communication with the inflation cavity (1.2) and a back air channel (1.5) in communication with the back air cavity (2.1).

3. A low pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The control shaft (3) is provided with a gear slot (3.1) on the side surface, and the side surfaces of the two connecting plates (5) are both fixed with gear teeth (5.1) engaged with the gear slot (3.1).

4. A low pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The partition plate (6) is provided with an arc-shaped slot (6.1) at the middle of one side of the control shaft (3), and the partition plate (6) is provided with a through hole (6.2) at the connecting plate (5), and the shape of the through hole (6.2) is the same as the cross section of the connecting plate (5).

5. A low pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The distance between the two partition plates (6) is greater than the length of the connecting plate (5).

6. A low pressure bypass valve pneumatic actuator according to claim 1, characterized in that: The piston plate (4) is provided with a ring groove (4.1) on the outside, and a sealing sleeve is sleeved in the ring groove (4.1).

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