阅读说明：本技术 一种气动执行机构 (Pneumatic actuating mechanism ) 是由 郑安力 王海龙 吴慧娟 于 2019-10-12 设计创作，主要内容包括：本发明公开了一种气动执行机构,属于阀门技术领域,旨在解决现有的二位三通阀无法根据气路压力变化,自动更改流向的问题,包括阀体、活塞杆、换向弹簧及滚珠锁紧结构；阀体下端固接有二位三通阀,活塞杆下端固接有活塞,二位三通阀分为第一流道和第二流道；滚珠锁紧结构包括滚珠盘、滚珠套及滚珠,滚珠套与阀体滑移连接,阀体分为第一腔室和第二腔室,第二腔室连通有气压检测口,滚珠套上固接有第一弹簧座,换向弹簧设于第一弹簧座内；滚珠盘与阀体固接,滚珠盘上开设有通孔,活塞杆上开设有限位槽；当滚珠套向下/向上移动时,挤压滚珠至限位槽内/滚珠排出限位槽,对第一流道和第二流道进行切换。本发明适用于二位三通阀的换向。(The invention discloses a pneumatic actuating mechanism, which belongs to the technical field of valves and aims to solve the problem that the flow direction of the existing two-position three-way valve cannot be automatically changed according to the pressure change of a gas path, and the pneumatic actuating mechanism comprises a valve body, a piston rod, a reversing spring and a ball locking structure; the lower end of the valve body is fixedly connected with a two-position three-way valve, the lower end of the piston rod is fixedly connected with a piston, and the two-position three-way valve is divided into a first flow passage and a second flow passage; the ball locking structure comprises a ball disc, a ball sleeve and balls, the ball sleeve is connected with the valve body in a sliding mode, the valve body is divided into a first cavity and a second cavity, the second cavity is communicated with an air pressure detection port, the ball sleeve is fixedly connected with a first spring seat, and the reversing spring is arranged in the first spring seat; the ball disc is fixedly connected with the valve body, a through hole is formed in the ball disc, and a limit groove is formed in the piston rod; when the ball sleeve moves downwards/upwards, the balls are extruded into the limiting groove/are discharged out of the limiting groove, and the first flow passage and the second flow passage are switched. The invention is suitable for reversing the two-position three-way valve.)

1. A pneumatic actuating mechanism is characterized by comprising a valve body (1), a piston rod (2), a reversing spring (3) and a ball locking structure;

the lower end of the valve body (1) is fixedly connected with a two-position three-way valve (5), one end, far away from the first cavity (11), of the piston rod (2) is fixedly connected with a piston (21), and the piston (21) divides the two-position three-way valve (5) into a first flow passage and a second flow passage;

the ball locking structure comprises a ball disc (41), a ball sleeve (42) and balls (43), the ball sleeve (42) is connected with the valve body (1) in a sliding mode, the ball sleeve (42) divides the valve body (1) into a first chamber (11) and a second chamber (12), the second chamber (12) is communicated with an air pressure detection port (121), a first spring seat (421) is fixedly connected to the ball sleeve (42), the first spring seat (421) is located in the first chamber (11), and the reversing spring (3) is arranged in the first spring seat (421) and applies thrust to the piston rod (2);

the ball disc (41) is positioned in the second cavity (12) and is fixedly connected with the valve body (1), a through hole (411) for embedding the ball (43) is formed in the ball disc (41), and a limit groove (22) is formed in the piston rod (2);

when the ball sleeve (42) moves downwards/upwards, the ball (43) is pressed into the limiting groove (22)/the ball (43) is discharged out of the limiting groove (22), and the first flow passage and the second flow passage are switched.

2. A pneumatic actuator according to claim 1, wherein the first channel comprises a first channel (51) and a third channel (53), the second channel comprises a second channel (52) and a third channel (53), the first channel (51) and the second channel (52) are arranged on the same side, the third channel (53) is arranged on the other side, and the third channel (53) is arranged between the first channel (51) and the second channel (52).

3. A pneumatic actuator according to claim 2, wherein the piston (21) switches the first flow passage and the second flow passage, specifically, a first sealing section (54), a second sealing section (55) and a third sealing section (56) are fixed on the inner wall of the two-position three-way valve (5), the piston (21) is X-shaped, and the piston (21) comprises an upper sealing section (211) and a lower sealing section (212);

when the top end of the upper sealing section (211) is abutted against the first sealing section (54), namely the first sealing section (54) is completely overlapped with the upper sealing section (211), the first channel (51) is communicated with the third channel (53) and is switched into a first flow channel;

when the bottom end of the lower sealing section (212) is abutted against the third sealing section (56), namely the third sealing section (56) is completely overlapped with the lower sealing section (212), the second channel (52) is communicated with the third channel (53), and a second flow passage is switched.

4. The pneumatic actuator according to claim 1, wherein the ball sleeve (42) and the ball disc (41) are sealed, specifically, a receiving groove (422) is formed in an inner periphery of the ball sleeve (42), a sealing ring (4221) is embedded in the receiving groove (422), and an outer periphery of the ball disc (41) abuts against the sealing ring (4221).

5. A pneumatic actuator according to claim 1, wherein a first stopper portion (423) extends from a side of the ball housing (42) adjacent to the ball disc (41), and a second stopper portion (412) extends from a side of the ball disc (41) adjacent to the ball housing (42) for limiting a stroke of the ball housing (42) moving in the direction of the piston rod (2).

6. A pneumatic actuator according to claim 1, wherein a reset handle (6) is fixed to the end of the piston rod (2) extending beyond the two-position three-way valve (5).

7. A pneumatic actuator according to claim 1, wherein a third position-limiting portion (213) is provided on the piston rod (2), and the third position-limiting portion (213) is provided below the piston (21) to limit the maximum distance that the piston rod (2) can slide out of the two-position three-way valve (5).

8. A pneumatic actuator according to any of claims 1-7, wherein a pressure regulating spring (7) is provided between the first chamber (11) and the first spring seat (421), the pressure regulating spring (7) of different dimensions being arranged to provide different effective pressures to the first spring seat (421).

9. A pneumatic actuator according to any of claims 1 to 7, wherein a floating spring seat (8), a pressure regulating spring (7) and a nut screw (9) are provided in the first chamber (11), the pressure regulating spring (7) is located between the floating spring seat (8) and the first spring seat (421), and the nut screw (9) provides different acting pressures to the first spring seat (421) by pressing the pressure regulating spring (7) to different lengths.

Technical Field

The invention relates to a shut-off valve, in particular to a pneumatic actuating mechanism.

Background

Three-way valves are often used in conveying gas media, and the conventional three-way valves generally rotate a valve rod through a rotating handle or control the valve rod to move up and down through an electromagnetic coil or an air cylinder, so that the flow direction of the media is changed. The existing three-way valve can not automatically change the flow direction according to the set pressure according to the pressure condition of a gas circuit, and the use occasion is limited.

Based on the practical experience and professional knowledge of the engineering application of the products for years, the designer actively carries out research and innovation by matching with the application of the theory so as to create a pneumatic actuating mechanism and ensure that the pneumatic actuating mechanism has higher practicability.

Disclosure of Invention

The invention aims to provide a pneumatic actuating mechanism, and aims to solve the technical problem that a two-position three-way valve cannot automatically change the flow direction according to the pressure change of a gas path in the prior art.

The technical purpose of the invention is realized by the following technical scheme:

a pneumatic actuating mechanism comprises a valve body, a piston rod, a reversing spring and a ball locking structure;

the lower end of the valve body is fixedly connected with a two-position three-way valve, one end of the piston rod, which is far away from the first chamber, is fixedly connected with a piston, and the piston divides the two-position three-way valve into a first flow passage and a second flow passage;

the ball locking structure comprises a ball disc, a ball sleeve and balls, the ball sleeve is connected with the valve body in a sliding mode, the ball sleeve divides the valve body into a first cavity and a second cavity, the second cavity is communicated with an air pressure detection port, a first spring seat is fixedly connected onto the ball sleeve and located in the first cavity, and a reversing spring is arranged in the first spring seat and applies thrust to the piston rod;

the ball disc is positioned in the second cavity and fixedly connected with the valve body, a through hole for embedding the ball is formed in the ball disc, and a limit groove is formed in the piston rod;

when the ball sleeve moves downwards/upwards, the ball is extruded into the limiting groove/is discharged out of the limiting groove, and the first flow passage and the second flow passage are switched.

Further, the first channel includes a first channel and a third channel, the second channel includes a second channel and a third channel, the first channel and the second channel are disposed on the same side, the third channel is disposed on the other side, and the third channel is disposed between the first channel and the second channel.

Further, the switching of the first flow channel and the second flow channel by the piston is specifically that a first sealing section, a second sealing section and a third sealing section are fixed on the inner wall of the two-position three-way valve, the piston is in an X shape, and the piston comprises an upper sealing section and a lower sealing section;

when the top end of the upper sealing section is abutted against the first sealing section, namely the first sealing section is completely overlapped with the upper sealing section, the first channel is communicated with the third channel and is switched into a first flow channel;

and when the bottom end of the lower sealing section is abutted against the third sealing section, namely the third sealing section is completely overlapped with the lower sealing section, the second channel is communicated with the third channel and is switched into a second flow channel.

Further, the ball sleeve with sealed between the ball dish specifically do, the holding tank has been seted up to ball sleeve inner periphery, the embedded sealing washer that is equipped with of holding tank, ball dish periphery with the sealing washer butt.

Furthermore, one side of the ball sleeve, which is close to the ball disc, extends to form a first limiting part, and one side of the ball disc, which is close to the ball sleeve, extends to form a second limiting part, so that the stroke of the ball sleeve moving along the direction of the piston rod is limited.

Furthermore, one end of the piston rod extending out of the two-position three-way valve is fixedly connected with a reset handle.

Furthermore, a third limiting part is arranged on the piston rod and arranged below the piston to limit the maximum distance of the piston rod sliding out of the two-position three-way valve.

Further, a pressure regulating spring is arranged between the first cavity and the first spring seat, and the pressure regulating springs of different specifications are used for providing different action pressures for the first spring seat.

Further, be equipped with floating spring holder, pressure regulating spring and nut jackscrew in the first cavity, the pressure regulating spring is located floating the spring holder with between the first spring holder, the nut jackscrew is through the extrusion the pressure regulating spring is right to different length first spring holder provides different effect pressure.

The invention has the following beneficial effects:

the air pressure detection port is connected with a monitoring pressure source, when the pressure of the air pressure detection port is smaller than a preset pressure, the ball sleeve moves downwards, the through holes of the ball and the ball disc are squeezed into the limiting groove of the piston rod, so that the piston is prevented from moving downwards, and at the moment, the first channel is communicated with the third channel; when the pressure of the air pressure detection port is higher than the preset pressure, the ball sleeve moves upwards, the balls are discharged from the through holes of the ball disc, the piston rod pushes the piston of the piston rod to move downwards under the action of the reversing spring, and the second channel is communicated with the third channel, so that the effect of automatically changing the flow direction according to the change of the pressure of the air path is achieved.

Drawings

FIG. 1 is a schematic structural diagram of the pneumatic actuator embodying the whole of the present embodiment;

FIG. 2 is a view showing a state in which the restriction of the piston rod by the balls is released in the present embodiment;

FIG. 3 is a diagram illustrating the piston rod being restrained by the balls in the present embodiment;

FIG. 4 is a schematic structural view for embodying the piston in the present embodiment;

FIG. 5 is a schematic structural diagram for showing the first flow passage communication in the present embodiment;

FIG. 6 is a schematic structural view for embodying the communication of the second flow passage in the present embodiment;

fig. 7 is an enlarged view of the connection between the receiving groove and the packing ring at a in fig. 1.

In the figure, 1, a valve body; 11. a first chamber; 12. a second chamber; 121. an air pressure detection port; 2. a piston rod; 21. a piston; 211. an upper seal section; 212. a lower seal section; 213. a third limiting part; 22. a limiting groove; 3. a reversing spring; 41. a ball tray; 411. a through hole; 412. a second limiting part; 42. a ball sleeve; 421. a first spring seat; 422. accommodating grooves; 4221. a seal ring; 423. a first limiting part; 43. a ball bearing; 5. a two-position three-way valve; 51. a first channel; 52. a second channel; 53. a third channel; 54. a first seal section; 55. a second seal section; 56. a third seal section; 6. a reset handle; 7. a pressure regulating spring; 8. a floating spring seat; 9. and (6) jacking the nut.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

A pneumatic actuator is shown in figures 1 to 3 and comprises a valve body 1, a piston rod 2, a reversing spring 3 and a ball locking structure; the lower end of the valve body 1 is fixedly connected with a two-position three-way valve 5, the lower end of the piston rod 2 is fixedly connected with a piston 21, and the piston 21 divides the two-position three-way valve 5 into a first flow passage and a second flow passage; the ball locking structure comprises a ball disc 41, a ball sleeve 42 and balls 43, the ball sleeve 42 is connected with the valve body 1 in a sliding manner, the ball sleeve 42 divides the valve body 1 into a first chamber 11 and a second chamber 12, the second chamber 12 is communicated with an air pressure detection port 121, a first spring seat 421 is fixedly connected to the ball sleeve 42, the first spring seat 421 is positioned in the first chamber 11, the reversing spring 3 is arranged in the first spring seat 421 and applies thrust to the piston rod 2, wherein the reversing spring 3 is in a compressed state, and after the ball locking structure relieves the limitation on the piston rod 2, the reversing spring 3 can drive the piston rod 2 to move downwards; the ball disc 41 is located in the second chamber 12 and is fixedly connected with the valve body 1, a through hole 411 for embedding the ball 43 is formed in the ball disc 41, and a limit groove 22 is formed in the piston rod 2, wherein one or more through holes 411 are formed, and when a plurality of through holes 411 are formed, the through holes can be annularly arranged in the circumferential direction of the ball disc 41; when the ball housing 42 moves down/up, the ball 43 is pressed into the stopper groove 22/the ball 43 is discharged out of the stopper groove 22, and the first flow passage and the second flow passage are switched.

The air pressure detection port 121 is connected to a monitoring pressure source, when the pressure of the air pressure detection port 121 is smaller than a preset pressure, the ball sleeve 42 moves downwards to extrude the balls 43 and the through holes 411 of the ball disc 41 into the limiting grooves 22 of the piston rod 2, so that the piston 21 is prevented from moving downwards, and at the moment, the first channel 51 is communicated with the third channel 53; when the pressure of the air pressure detection port 121 is higher than the preset pressure, the ball sleeve 42 moves upwards, the balls 43 are discharged from the through holes 411 of the ball disc 41, and the piston rod 2 pushes the piston 21 of the piston rod 2 to move downwards under the action of the reversing spring 3, so that the second channel 52 is communicated with the third channel 53, and the effect of automatically changing the flow direction according to the change of the air path pressure is achieved.

As shown in fig. 1, the first channel includes a first channel 51 and a third channel 53, the second channel includes a second channel 52 and a third channel 53, the first channel 51 and the second channel 52 are disposed on the same side, the third channel 53 is disposed on the other side, and the third channel 53 is disposed between the first channel 51 and the second channel 52.

As shown in fig. 4 to 6, the switching of the piston 21 to the first flow passage and the second flow passage is specifically that a first sealing section 54, a second sealing section 55 and a third sealing section 56 are fixed on the inner wall of the two-position three-way valve 5, the piston 21 is in an X shape, and the piston 21 comprises an upper sealing section 211 and a lower sealing section 212; when the top end of the upper sealing section 211 abuts against the first sealing section 54, that is, the first sealing section 54 completely overlaps with the upper sealing section 211, the first channel 51 is communicated with the third channel 53, and is switched to a first flow channel, and the specific position is as shown in fig. 5; when the bottom end of the lower sealing section 212 abuts against the third sealing section 56, that is, the third sealing section 56 completely overlaps with the lower sealing section 212, the second channel 52 is communicated with the third channel 53, and the specific position is as shown in fig. 6. Here, the sealing of the piston 21 with the inner wall of the two-position three-way valve 5 is achieved by an O-ring seal.

As shown in fig. 7, the sealing between the ball sleeve 42 and the ball disc 41 is specifically performed such that the inner periphery of the ball sleeve 42 is provided with a housing groove 422, a seal ring 4221 is fitted into the housing groove 422, and the outer periphery of the ball disc 41 abuts against the seal ring 4221. The seal ring 4221 can effectively seal the second chamber 12, and the possibility of failure of the pneumatic actuator due to poor sealing performance is remarkably reduced.

As shown in fig. 7, a first stopper 423 extends from a lower side of the ball sleeve 42, and a second stopper 412 extends from an upper side of the ball plate 41 to limit a stroke of the ball sleeve 42 moving along the piston rod 2. In specific implementation, the first position-limiting portion 423 may be annular, and is fixedly connected to a sidewall of the ball sleeve 42, or may be integrally formed with the ball sleeve 42; the second stopper 412 may be annular, fixed to a sidewall of the ball disk 41, or integrally formed with the ball disk 41.

As shown in fig. 1, a reset handle 6 is fixedly connected to one end of the piston rod 2 extending out of the two-position three-way valve 5, and specifically, the reset handle 6 is in a horn shape and has a diameter larger than that of the piston rod 2.

As shown in fig. 5, in order to prevent the piston rod 2 from sliding too much when the flow path is switched, that is, the length of the piston rod 2 sliding out of the two-position three-way valve 5 is too long, a third limiting portion 213 is further disposed on the piston rod 2, the third limiting portion 213 is disposed below the piston 21 for limiting the maximum distance of the piston rod 2 sliding out of the two-position three-way valve 5, and in specific implementation, the third limiting portion 213 may be annular, and is fixedly connected to a side wall of the piston rod 2, or may be integrally formed with the piston rod 2.

As shown in fig. 1, a pressure regulating spring 7 is arranged between the first chamber 11 and the first spring seat 421, the pressure regulating springs 7 of different specifications are used for providing different action pressures for the first spring seat 421, so as to deal with different reversing pressures, when a large reversing pressure is needed, the pressure regulating spring 7 of a large specification can be replaced, the pressure of the pressure regulating spring 7 on the first spring seat 421 is increased, when a small reversing pressure is needed, the pressure regulating spring 7 of a small specification can be replaced, the pressure of the pressure regulating spring 7 on the first spring seat 421 is reduced, and the applicable pressure range is enlarged.

As shown in fig. 1, it can be understood by those skilled in the art that, in order to avoid frequent replacement of pressure regulating springs 7 of different specifications and improve accuracy, a floating spring seat 8, a pressure regulating spring 7 and a nut jackscrew 9 are arranged in the first chamber 11, the pressure regulating spring 7 is located between the floating spring seat 8 and the first spring seat 421, and the nut jackscrew 9 provides different acting pressures to the first spring seat 421 by pressing the pressure regulating spring 7 to different lengths. When needing great switching-over pressure, screw up nut jackscrew 9, increase pressure regulating spring 7 is to the pressure of first spring holder 421, when needing less switching-over pressure, loosen nut jackscrew 9, reduce pressure regulating spring 7 to the pressure of first spring holder 421, through the fine setting of pressure regulating spring 7 effect length for it is better with pressure change matching degree, and the action is more accurate, and the precision is higher.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.