Pneumatic stop valve with efficient air cylinder sealing structure

Abstract

The utility model relates to a pneumatic stop valve with an efficient air cylinder sealing structure, which comprises a valve main body, a support frame and an air cylinder assembly, and the air cylinder assembly comprises an upper cylinder body, a lower cylinder body, a diaphragm, a pressure plate, a transmission rod, a positioning piece, a locking nut and a first sealing ring. According to the structure, the dismounting and mounting process between the air cylinder body and the supporting frame is simplified, the mounting convenience is improved, the valve rod is coaxially connected to the pressing disc through the transmission rod, the diaphragm is made of the flexible material, the air cylinder body is allowed to shift within a small range relative to the valve rod, the mounting difficulty of the valve is reduced through the design, and meanwhile through the effect of the first sealing ring, the sealing performance of the valve is improved. Effective sealing between the positioning piece and the lower cylinder body is achieved, the number of air cylinder holes is reduced, the sealing effect is enhanced, and therefore the transmission efficiency of the air cylinder is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of valves, and in particular to a pneumatic shut-off valve with a high-efficiency cylinder sealing structure. Background Technology

[0002] Pneumatic shut-off valves are an indispensable key component in industrial automation control systems. They mainly consist of a valve body, a support frame, and a cylinder. The valve body contains a valve stem, which controls the movement of the valve core. The movement of the valve stem is driven by the transmission rod of the cylinder, thereby realizing the opening and closing of the shut-off valve.

[0003] In the traditional structure of pneumatic shut-off valves, the cylinder and support frame are usually fixed by bolt connection. This connection structure has high requirements for the precision of the machining holes. In order to ensure that the valve stem and transmission rod can be coaxially distributed, corresponding adjustments need to be made during installation. In addition, it increases the number of openings in the cylinder, which makes the connection between the cylinder and the support frame prone to air leakage, thereby reducing the transmission efficiency of the cylinder. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is as follows: a pneumatic shut-off valve with a high-efficiency cylinder sealing structure, including a valve body, a support frame, and a cylinder assembly. The valve body is provided with a valve stem for controlling its flow or disconnection. The valve body is connected to a cylinder assembly for controlling the movement of the valve stem through the support frame. The cylinder assembly includes an upper cylinder body, a lower cylinder body, a diaphragm, a pressure plate, a transmission rod, a positioning element, a locking nut, and a first sealing ring. The upper cylinder body and the lower cylinder body are combined to form a pneumatic chamber. The outer side of the diaphragm is engaged between the upper cylinder body and the lower cylinder body, and its inner side abuts against the pressure plate. The upper cylinder body and the lower cylinder body are provided with air holes for connecting an external compressor. The upper and lower ends of the positioning element are threadedly connected to the lower cylinder body and the support frame through locking nuts, respectively. One end of the transmission rod passes through the positioning element and the diaphragm in sequence and is connected to the pressure plate, and the other end is threadedly connected to the valve stem. The positioning element is provided with an annular portion between the lower cylinder body and the support frame. The first sealing ring is fitted on the side of the annular portion facing the lower cylinder body, so that the positioning element and the lower cylinder body are sealed together by the first sealing ring.

[0005] Using the above technical solution, the upper cylinder body and the lower cylinder body are integrally stamped. A positioning component is added between the cylinder body and the support frame. This structure not only simplifies the disassembly and assembly process between the cylinder body and the support frame, but also improves the ease of installation. The valve stem is coaxially connected to the pressure plate through the transmission rod. Since the diaphragm is made of flexible material, it allows the cylinder body to offset slightly relative to the valve stem. This design reduces the difficulty of valve installation. At the same time, through the action of the first sealing ring, effective sealing is achieved between the positioning component and the lower cylinder body, and the number of cylinder openings is reduced, enhancing the sealing effect and thus improving the transmission efficiency of the cylinder.

[0006] The present invention is further configured such that the positioning member is provided with an upper threaded part, an annular part and a lower threaded part from top to bottom, and the lower cylinder body and the support frame are respectively provided with an upper mounting hole and a lower mounting hole adapted to the upper threaded part and the lower threaded part. The upper threaded part passes through the upper mounting hole and the positioning member and the lower cylinder body are connected by a locking nut, and the lower threaded part passes through the lower mounting hole and the lower cylinder body and the support frame are connected by a locking nut.

[0007] Using the above technical solution, the upper threaded part is used to connect the positioning part and the lower cylinder body, and the lower threaded part is used to connect the lower cylinder body and the support frame. This makes the two threaded parts of the positioning part have a clear division of labor and facilitates the replacement of the cylinder during subsequent maintenance.

[0008] The present invention is further configured such that the lower mounting hole is provided with a countersunk groove coaxially distributed with the valve stem, the annular portion is engaged with the countersunk groove, and the annular portion and the countersunk groove are combined to form a sealing groove for installing the first sealing ring.

[0009] By adopting the above technical solution, the transmission rod and the positioning component are coaxially distributed through the positioning of the sealing groove. The positioning of the sealing groove also prevents the first sealing ring from detaching from the annular part due to deformation, thus maintaining the stability of the sealing mechanism.

[0010] The present invention is further configured such that the positioning member has an inner hole, the transmission rod is slidably connected to the positioning member through the inner hole, and a positioning sleeve and a second sealing ring are provided between the positioning member and the transmission rod.

[0011] By adopting the above technical solution, gas leakage from the gap between the positioning component and the transmission rod is prevented through the second sealing ring, thereby improving the transmission efficiency of the cylinder.

[0012] The present invention is further configured such that a positioning disk is provided between the transmission rod and the diaphragm, and the side of the positioning disk facing the diaphragm has a rounded corner surface.

[0013] By adopting the above technical solution, the contact area between the diaphragm and the transmission rod is increased by the positioning plate, which prevents the transmission rod from damaging the diaphragm and improves the service life of the diaphragm.

[0014] The present invention is further configured such that a spring is provided between the pressure plate and the upper / lower cylinder body, and the pressure plate is provided with a protrusion for positioning the spring.

[0015] By adopting the above technical solution, the design of the protrusion avoids uneven force or movement jamming caused by spring tilting. The spring reset keeps the valve body in a normally open or normally closed state, which is suitable for different working conditions.

[0016] The present invention is further configured such that the upper cylinder body and the lower cylinder body are provided with circumferentially distributed connecting holes around their perimeters, the diaphragm is bolted to the upper cylinder body and the lower cylinder body through the connecting holes around its perimeters, and the valve stem and the transmission rod are connected by a threaded sleeve.

[0017] The above technical solution, with its circumferentially distributed connecting holes, not only ensures uniform force distribution between the diaphragm and the cylinder, but also improves the sealing effect between the upper and lower cylinders through the outer part of the diaphragm. The overall design structure is reasonable and facilitates the installation and maintenance of the cylinder.

[0018] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the present invention;

[0020] Figure 2 For the present utility model Figure 1 A magnified view of the central A-direction view;

[0021] Figure 3 This is a cross-sectional view of the positioning component of this utility model;

[0022] Figure 4 For the present utility model Figure 1 A magnified view of the central B-direction view;

[0023] Figure 5 This is a cross-sectional view of the normally closed structure of the cylinder assembly of this utility model.

[0024] Figure 6 This is a cross-sectional view of the normally open structure of the cylinder assembly of this utility model;

[0025] The components are: 1-valve body, 2-support frame, 3-cylinder assembly, 4-valve stem, 5-upper cylinder body, 6-lower cylinder body, 7-diaphragm, 8-pressure plate, 9-transmission rod, 10-positioning component, 11-locking nut, 12-first sealing ring, 13-pneumatic chamber, 14-air hole, 15-ring part, 16-upper threaded part, 17-lower threaded part, 18-upper mounting hole, 19-lower mounting hole, 20-countersunk groove, 21-sealing groove, 22-inner hole, 23-positioning sleeve, 24-second sealing ring, 25-positioning plate, 26-rounded corner surface, 27-connecting hole, 28-screw sleeve, 29-spring, 30-protrusion, 31-first stud part, 32-second stud part; Detailed Implementation

[0026] like Figure 1 , 2As shown, this embodiment provides a pneumatic shut-off valve with a high-efficiency cylinder sealing structure, including a valve body 1, a support frame 2, and a cylinder assembly 3. The valve body 1 is provided with a valve stem 4 for controlling its flow or disconnection. The valve body 1 is connected to the cylinder assembly 3 for controlling the movement of the valve stem 4 via the support frame 2. The cylinder assembly 3 includes an upper cylinder body 5, a lower cylinder body 6, a diaphragm 7, a pressure plate 8, a transmission rod 9, a positioning element 10, a locking nut 11, and a first sealing ring 12. The upper cylinder body 5 and the lower cylinder body 6 are combined to form a pneumatic chamber 13. The outer side of the diaphragm 7 is engaged with the upper cylinder body 5 and the lower cylinder body 6. Between them, the inner side of the pressure plate 8 is abutted, the upper cylinder 5 and the lower cylinder 6 are provided with air holes 14 for connecting to an external compressor, the upper and lower ends of the positioning member 10 are respectively threaded to the lower cylinder 6 and the support frame 2 through locking nuts 11, one end of the transmission rod 9 passes through the positioning member 10 and the diaphragm 7 in sequence and is connected to the pressure plate 8, and the other end is threaded to the valve stem 4. The positioning member 10 is provided with a ring part 15 between the lower cylinder 6 and the support frame 2, and a first sealing ring 12 is fitted on the side of the ring part 15 facing the lower cylinder 6, so that the positioning member 10 and the lower cylinder 6 are sealed together by the first sealing ring 12.

[0027] Combination Figure 3 As shown, in this embodiment, the positioning member 10 is provided with an upper threaded portion 16, an annular portion 15, and a lower threaded portion 17 from top to bottom. The lower cylinder body 6 and the support frame 2 are respectively provided with an upper mounting hole 18 and a lower mounting hole 19 that are adapted to the upper threaded portion 16 and the lower threaded portion 17. The upper threaded portion 16 passes through the upper mounting hole 18 and is connected to the positioning member 10 and the lower cylinder body 6 through the locking nut 11. The lower threaded portion 17 passes through the lower mounting hole 19 and is connected to the lower cylinder body 6 and the support frame 2 through the locking nut 11. The lower mounting hole 19 is provided with a countersunk groove 20 that is coaxially distributed with the valve stem 4. The annular portion 15 is engaged with the countersunk groove 20, and the annular portion 15 and the countersunk groove 20 are combined to form a sealing groove 21 for installing the first sealing ring 12. The sealing groove 21 is a fully enclosed inner groove. The positioning of the sealing groove 21 makes the transmission rod 9 and the positioning member 10 coaxially distributed. The positioning of the sealing groove 21 prevents the first sealing ring 12 from detaching from the annular portion 15 due to deformation.

[0028] In this embodiment, the positioning member 10 is provided with an inner hole 22, and the transmission rod 9 is slidably connected to the positioning member 10 through the inner hole 22. A positioning sleeve 23 and a second sealing ring 24 are provided between the positioning member 10 and the transmission rod 9. The second sealing ring 24 prevents gas from leaking from the gap between the positioning member 10 and the transmission rod 9. A positioning disk 25 is provided between the transmission rod 9 and the diaphragm 7, and the side of the positioning disk 25 facing the diaphragm 7 is provided with a rounded corner surface 26. The positioning disk 25 increases the contact area between the diaphragm 7 and the transmission rod 9, preventing the transmission rod 9 from damaging the diaphragm 7.

[0029] Combination Figure 4As shown, in this embodiment, the upper cylinder 5 and the lower cylinder 6 are provided with circumferentially distributed connecting holes 27. The diaphragm 7 is bolted between the upper cylinder 5 and the lower cylinder 6 through the connecting holes 27. The valve stem 4 and the transmission rod 9 are connected by a threaded sleeve 28. The circumferentially distributed connecting holes 27 design of the cylinder body not only ensures uniform force between the diaphragm 7 and the cylinder body, but also improves the sealing effect between the upper cylinder 5 and the lower cylinder 6 through the outer part of the diaphragm 7.

[0030] like Figure 5 As shown, this utility model discloses an embodiment in which the cylinder assembly 3 is normally closed. A spring 29 is provided between the pressure plate 8 and the upper cylinder body 5. The pressure plate 8 is provided with a protrusion 30 for positioning the spring 29. The transmission rod 9 is provided with a first stud portion 31. The first stud portion 31 passes through the positioning plate 25, the diaphragm 7, and the pressure plate 8 and is locked by double nuts. The diaphragm 7 deforms and protrudes in the direction of the lower cylinder body 6.

[0031] like Figure 6 As shown, this utility model discloses an embodiment in which the cylinder assembly 3 is a normally open structure. In this embodiment, a spring 29 is provided between the pressure plate 8 and the lower cylinder 6. The pressure plate 8 is provided with a protrusion 30 for positioning the spring 29. The positioning plate 25 is provided with a second stud portion 32. The second stud portion 32 passes through the diaphragm 7, the pressure plate 8 and is threadedly connected to the transmission rod 9. The diaphragm 7 deforms and protrudes in the direction of the upper cylinder 5.

[0032] The working principle of this utility model is as follows: when compressed air enters the pneumatic chamber 13 through the air hole 14, the air pressure acts on the diaphragm 7, causing it to deform. The deformation of the diaphragm 7 is transmitted to the valve stem 4 through the transmission rod 9, driving the valve stem 4 to rise or fall, thereby realizing the flow or cut-off of the valve. When maintenance of the cylinder assembly 3 is required, firstly, rotate the locking nut 11 in the opposite direction to separate the support frame 2 from the positioning part 10; then, rotate the screw sleeve 28 in the opposite direction to separate the valve stem 4 from the transmission rod 9. After completing the above steps, the cylinder assembly 3 can be removed for easy maintenance or replacement.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A pneumatic stop valve with high efficiency cylinder sealing structure, comprising a valve body (1), a support frame (2) and a cylinder assembly (3), the valve body (1) is provided with a valve stem (4) for controlling its flow or disconnection, the valve body (1) is connected with the cylinder assembly (3) for controlling the movement of the valve stem (4) through the support frame (2), characterized in that, The cylinder assembly (3) comprises an upper cylinder body (5), a lower cylinder body (6), a diaphragm (7), a pressure plate (8), a transmission rod (9), a positioning piece (10), a locking nut (11) and a first sealing ring (12), the upper cylinder body (5) and the lower cylinder body (6) combine to form a pneumatic cavity (13), the outer side of the diaphragm (7) is clamped between the upper cylinder body (5) and the lower cylinder body (6), and the inner side abuts against the pressure plate (8), the upper cylinder body (5) and the lower cylinder body (6) are provided with air holes (14) for connecting the compressor, the upper and lower ends of the positioning piece (10) are respectively threadedly connected with the lower cylinder body (6) and the support frame (2) through the locking nut (11), one end of the transmission rod (9) passes through the positioning piece (10) and the diaphragm (7) in sequence and is connected to the pressure plate (8), the other end is threadedly connected to the valve rod (4), the positioning piece (10) is provided with a circular ring part (15) between the lower cylinder body (6) and the support frame (2), the first sealing ring (12) is sleeved on one side of the circular ring part (15) facing the lower cylinder body (6), and the positioning piece (10) is sealingly connected with the lower cylinder body (6) through the first sealing ring (12).

2. The aerodynamic globe valve with high efficiency cylinder sealing structure according to claim 1, characterized in that: The positioning piece (10) is provided with an upper threaded part (16), a circular ring part (15) and a lower threaded part (17) from top to bottom, the lower cylinder body (6) and the support frame (2) are respectively provided with an upper mounting hole (18) and a lower mounting hole (19) matched with the upper threaded part (16) and the lower threaded part (17), the upper threaded part (16) passes through the upper mounting hole (18) and connects the positioning piece (10) and the lower cylinder body (6) through the locking nut (11), and the lower threaded part (17) passes through the lower mounting hole (19) and connects the lower cylinder body (6) and the support frame (2) through the locking nut (11).

3. The aerodynamic globe valve with high efficiency cylinder seal structure according to claim 2, characterized in that: The lower mounting hole (19) is provided with a countersunk groove (20) coaxially distributed with the valve rod (4), the circular ring part (15) is clamped in the countersunk groove (20), and the circular ring part (15) and the countersunk groove (20) combine to form a sealing groove (21) for mounting the first sealing ring (12).

4. The aerodynamic globe valve with high efficiency cylinder seal according to claim 2, characterized in that: The positioning piece (10) is provided with an inner hole (22), the transmission rod (9) is slidingly connected to the positioning piece (10) through the inner hole (22), and a positioning sleeve (23) and a second sealing ring (24) are arranged between the positioning piece (10) and the transmission rod (9).

5. The aerodynamic globe valve with high efficiency cylinder seal according to claim 4, characterized in that: The positioning disc (25) is arranged between the transmission rod (9) and the diaphragm (7), and a round corner surface (26) is arranged on one side of the positioning disc (25) facing the diaphragm (7).

6. The aerodynamic globe valve with high efficiency cylinder seal according to claim 5, characterized in that: The pressure plate (8) is provided with a spring (29) between the pressure plate (8) and the upper cylinder body (5) / lower cylinder body (6), and the pressure plate (8) is provided with a protruding part (30) for positioning the spring (29).

7. The aerodynamic globe valve with high efficiency cylinder seal according to claim 1, characterized in that: The upper cylinder body (5) and the lower cylinder body (6) are provided with circumferentially distributed connecting holes (27), and the diaphragm (7) is bolted between the upper cylinder body (5) and the lower cylinder body (6) through the connecting holes (27).

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