CN218598945U

CN218598945U - Pneumatic control valve

Info

Publication number: CN218598945U
Application number: CN202223158715.9U
Authority: CN
Inventors: 毛剑
Original assignee: Ningbo Tianxin Canon Pneumatic Complete Set Co ltd
Current assignee: Ningbo Tianxin Canon Pneumatic Complete Set Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-03-10
Anticipated expiration: 2032-11-28

Abstract

The utility model discloses a pneumatic control valve, which comprises a valve body and a cylinder, wherein the valve body is respectively provided with an air inlet, an air outlet and a valve port, the air inlet is communicated with the air outlet through the valve port, the cylinder comprises a cylinder body, a front cover, a rear cover, a first piston, a second piston and a piston rod, the front cover is fixedly connected with the valve body in a sealing way, an accommodating space is formed by matching the front cover, the cylinder body and the rear cover, and the accommodating space is divided into a front cavity and a rear cavity which are mutually independent by the first piston; the piston rod is fixedly connected with the first piston, penetrates through the front cover and is in sealing fit with the valve port, and the second piston is movably sleeved between the rear end of the first piston and the cylinder body. The utility model has the advantages of simple and reasonable structure, control is convenient, and the during operation can make the valve port keep opening for a long time, can also control and adjust fluid's output flow, and the function is various.

Description

Pneumatic control valve

Technical Field

The utility model relates to a pneumatic component technical field, in particular to gas accuse valve.

Background

Valve products are one of the common pneumatic elements, and are generally applied to the opening and closing control of an air path. The valve products have various structures and different forms, and a normally closed two-position two-way electromagnetic valve is particularly common.

Two solenoid valves of current normal close formula, its structure includes the valve body usually, the guide head subassembly that is connected with the valve body, the valve body is equipped with air inlet and gas outlet, be equipped with the valve port that is used for communicateing air inlet and gas outlet in the valve body, the guide head subassembly is including separating magnetic sleeve, move the iron core, quiet iron core and coil pack, separate magnetic sleeve fixed connection to valve body, move iron core and quiet iron core and locate in separating magnetic sleeve, move the iron core and stretch into in the valve body and with the sealed cooperation of valve port, the coil pack cover is located and is separated the telescopic outside of magnetism, it is equipped with reset spring to support between iron core and the sleeve to move. When the valve works, the coil assembly is powered on and powered off to control the movable iron core to move axially, so that the valve port is opened and closed, and the effect of controlling the on-off of the air inlet and the air outlet is achieved. As to the specific structure of the normally closed two-position two-way electromagnetic valve, see also a two-position two-way high-frequency electromagnetic valve disclosed in chinese patent (publication No. CN 204985944U).

The existing normally closed two-position two-way electromagnetic valve adopts a pilot head assembly to control the opening and closing of a valve port, so that the following defects exist: firstly, the valve port cannot be kept open for a long time, and once the coil assembly is in a power-on state for a long time to open the valve port, the coil assembly is easily burnt out, so that the electromagnetic valve breaks down, and the service life is influenced; secondly, the guide head subassembly only can play the effect that control valve port opened or was sealed for the function is comparatively single, leads to using to have great limitation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect with not enough, provide a gas accuse valve, its simple structure is reasonable, control is convenient, the during operation can make the valve port keep opening for a long time, can also control and adjust fluidic output flow, the function is various.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

A pneumatic control valve comprises a valve body, a cylinder and a valve seat, wherein the valve body is respectively provided with an air inlet, an air outlet and a valve port, the air inlet is communicated with the air outlet through the valve port, the cylinder comprises a cylinder body, a front cover, a rear cover, a first piston, a second piston and a piston rod, the front cover and the rear cover are respectively arranged at two ends of the cylinder body, the front cover and the valve body are fixedly connected in a sealing mode, an accommodating space is formed by matching the front cover, the cylinder body and the rear cover, the first piston is movably arranged in the accommodating space, the accommodating space is divided into a front cavity and a rear cavity which are independent of each other by the first piston, and the cylinder body is respectively provided with a first air hole communicated with the front cavity and a second air hole communicated with the rear cavity;

the rear end of the piston rod is fixedly connected with the first piston, the front end of the piston rod penetrates through a front cover and is in sealing fit with the valve port, a spring is abutted between the front end of the piston rod and the front cover, the second piston is movably sleeved between the rear end of the first piston and the cylinder body, a first limiting step in limiting fit with the front end of the second piston is arranged in the middle of the first piston, a second limiting step is arranged on the inner wall of the middle of the cylinder body, and a third limiting step in limiting fit with the second limiting step is arranged on the outer wall of the second piston.

Further, a sealing gasket assembly in sealing fit with the valve port is fixedly arranged at the front end of the piston rod.

Further, the sealing gasket subassembly includes copper sheathing, sealed pad and nut, the copper sheathing sealed pad reaches the nut by after to before concatenating in proper order in the front end of piston rod, the piston rod be provided with the rear end limit for a distance from complex location step of copper sheathing, the nut with piston rod threaded connection, sealed pad is fastened ground pressure and is located the nut with between the copper sheathing, the spring support locate the copper sheathing with between the protecgulum.

Further, a copper bush sealing ring is arranged between the copper bush and the piston rod.

Further, the protecgulum pass through the bolt with valve body fixed connection, the valve body be equipped with the corresponding annular of protecgulum, the embedded ring packing that is equipped with of annular, ring packing compress tightly firmly in the valve body with between the protecgulum.

Furthermore, a front cover sealing ring matched with the piston rod in a sealing mode is embedded in the center of the front cover.

Furthermore, a first Y-shaped ring matched with the inner wall of the cylinder body in a sealing mode is embedded in the outer wall of the front end of the first piston, and the opening direction of the first Y-shaped ring faces towards the front cavity.

Furthermore, a second Y-shaped ring in sealing fit with the inner wall of the cylinder body is embedded in the outer wall of the rear end of the second piston, and the opening direction of the second Y-shaped ring faces the rear cavity.

The utility model has the advantages that: the utility model provides a pneumatic control valve, through adopting the cylinder to replace the guide head subassembly among the prior art, in operation, through carrying out the air feed to preceding cavity and/or back cavity, make first piston drive piston rod along axial displacement, thereby alright open and close with the control valve port, moreover, through first piston and second piston cooperation, still make the first piston of during operation can be at the primary importance of accommodation space, second position and third position reciprocating motion, thereby can adjust the interval between piston rod and the valve port as required, adjust the aperture size of valve port promptly, play the effect of control and regulation fluid output flow, and the function is various.

Drawings

Fig. 1 is a schematic view of the overall exploded structure of the present invention.

Fig. 2 is a schematic view of the overall assembly structure of the present invention (the first piston is at the second position of the accommodating space).

Fig. 3 is an enlarged schematic view of a portion a in fig. 2.

In FIGS. 1-3:

1. a valve body;

11. an air inlet; 12. an air outlet; 13. a valve port; 14. a ring groove; 15. an annular seal ring;

2. a cylinder;

21. a cylinder body; 211. a first air hole; 212. a second air hole; 22. a front cover; 221. a front cover sealing ring; 23. a rear cover; 24. a first piston; 241. a first "Y" shaped seal ring; 25. a second piston; 251. a second "Y" shaped seal ring; 26. a piston rod; 261. positioning a step; 27. a bolt; 28. a gasket assembly;

281. a copper sleeve; 2811. a copper sleeve sealing ring; 282. a gasket; 283. a nut;

3. a front chamber;

4. a rear chamber;

5. a spring;

6. a first limit step;

7. a second limit step;

8. and a third limiting step.

Detailed Description

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

The pneumatic control valve shown in fig. 1-3 comprises a valve body 1 and a cylinder 2, wherein the valve body 1 is provided with an air inlet 11, an air outlet 12 and a valve port 13, the air inlet 11 is communicated with the air outlet 12 through the valve port 13, the cylinder 2 comprises a cylinder body 21, a front cover 22, a rear cover 23, a first piston 24, a second piston 25 and a piston rod 26, the front cover 22 and the rear cover 23 are respectively arranged at two ends of the cylinder body 21, the front cover 22 is fixedly connected with the valve body 1 in a sealing manner, specifically, the front cover 22 is fixedly connected with the valve body 1 through a bolt 27, the valve body 1 is provided with a ring groove 14 corresponding to the front cover 22, a ring seal ring 15 is embedded in the ring groove 14, the ring seal ring 15 is tightly pressed between the valve body 1 and the front cover 22, the connection is stable, and the sealing performance is good.

The front cover 22, the cylinder body 21 and the rear cover 23 are matched to form an accommodating space, the first piston 24 is movably arranged in the accommodating space, the first piston 24 can slide between a first position, a second position and a third position of the accommodating space in a reciprocating mode, the accommodating space is divided into a front cavity 3 and a rear cavity 4 which are independent of each other by the first piston 24, and the cylinder body 21 is respectively provided with a first air hole 211 communicated with the front cavity 3 and a second air hole 212 communicated with the rear cavity 4.

The rear end of the piston rod 26 is fixedly connected with the first piston 24, and the front end of the piston rod 26 passes through the front cover 22 and is in sealing fit with the valve port 13. In order to improve the sealing effect of the piston rod 26 on the valve port 13, a sealing gasket assembly 28 which is in sealing fit with the valve port 13 is fixedly arranged at the front end of the piston rod 26, specifically, the sealing gasket assembly 28 includes a copper bush 281, a sealing gasket 282 and a nut 283, the copper bush 281, the sealing gasket 282 and the nut 283 are sequentially connected in series to the front end of the piston rod 26 from back to front, the piston rod 26 is provided with a positioning step 261 which is in limiting fit with the rear end of the copper bush 281, the nut 283 is in threaded connection with the piston rod 26, the sealing gasket 282 is tightly pressed between the nut 283 and the copper bush 281, the axial distance between the copper bush 281 and the front cover 22 is greater than the maximum stroke of the piston rod 26, and it is ensured that the cylinder 2 can normally operate, so as to normally control the opening and closing of the valve port 13. Between the copper sleeve 281 and the front cover 22, a spring 5 is disposed, wherein the spring 5 is preferably a pagoda-shaped spring 5, for enabling the piston rod 26 to always have a tendency to close the valve port 13.

The second piston 25 is movably sleeved between the rear end of the first piston 24 and the cylinder body 21, a first limiting step 6 in limiting fit with the front end of the second piston 25 is arranged in the middle of the first piston 24, a second limiting step 7 is arranged on the inner wall of the middle of the cylinder body 21, and a third limiting step 8 in limiting fit with the second limiting step 7 is arranged on the outer wall of the second piston 25.

The main structure of the utility model is formed.

The utility model provides a gas accuse valve, in operation, through supplying gas to preceding cavity 3 and/or back cavity 4, make first piston 24 actuating piston pole 26 along axial displacement, thereby alright open and close with control valve port 13, can make valve port 13 keep opening for a long time, furthermore, cooperate through first piston 24 and second piston 25, still make the first piston 24 of during operation can be at the primary importance of accommodation space, second position and third position reciprocating motion, thereby can adjust the interval between piston pole 26 and the valve port 13 as required, adjust valve port 13's aperture size promptly, play the effect of control and regulation fluid output flow.

Specifically, in a normal state, no compressed gas is filled in the first air hole 211 and the second air hole 212, that is, the piston rod 26 is in a free state, and at this time, under the action of the spring 5, the piston rod 26 closes the valve port 13 through the sealing gasket assembly 28;

when the first air hole 211 is inflated and the second air hole 212 is exhausted, the pressure of the front chamber 3 rises at this time, the compressed gas in the front chamber 3 pushes the first piston 24 and the second piston 25 to move backwards completely until the first piston 24 and the second piston 25 are both abutted against the rear cover 23, namely, the first piston 24 is located at the first position of the accommodating space, the piston rod 26 is located at the first output stroke at this time, the distance between the piston rod 26 and the valve port 13 is the largest, the opening degree of the valve port 13 is the largest, the output flow of the valve body 1 is the largest, and in this process, the air in the rear chamber 4 is exhausted to the atmosphere through the second air hole 212;

when the first air hole 211 and the second air hole 212 are inflated, the front end of the first piston 24 is under the air pressure action of the front chamber 3, the rear end of the first piston 24 is under the air pressure action of the rear chamber 4, and the rear end of the second piston 25 is under the air pressure action of the rear chamber 4, in the process, because the pressure receiving area formed by the rear end of the first piston 24 and the rear end of the second piston 25 is larger than the pressure receiving area of the front end of the first piston 24, for the first piston 24 and the second piston 25, the thrust action of the rear chamber 4 is larger than the thrust action of the front chamber 3, under the matching action of the first limit step 6 of the first piston 24 and the front end surface of the second piston 25, the first piston 24 and the second piston 25 synchronously move forward until the third limit step 8 of the second piston 25 abuts against the second limit step 7 of the cylinder 21, the first piston 24 and the second piston 25 both stop moving, at the moment, the first piston 24 is located at the second position of the accommodating space (see fig. 2 and 3), correspondingly, the piston rod 26 is located at the second position corresponding to reduce the output stroke 13 of the valve body, and the output stroke 13 is reduced;

when the first air hole 211 is exhausted and the second air hole 212 is inflated, the pressure in the rear chamber 4 rises at this time, the compressed gas in the rear chamber 4 pushes the first piston 24 to move forward completely until the first piston 24 abuts against the front cover 22, that is, the first piston 24 is located at the third position of the accommodating space, at this time, the piston rod 26 is in the third output stroke, under the dual actions of the gas thrust of the rear chamber 4 and the elastic force of the spring 5, the sealing pad 282 at the front end of the piston rod 26 is in sealing contact with the valve port 13, the valve port 13 is closed, and in this process, the air in the front chamber 3 is exhausted to the atmosphere through the first air hole 211. In addition, in the exhaust state of the first air hole 211 and the inflation state of the second air hole 212, the piston rod 26 receives the dual actions of the gas thrust of the rear chamber 4 and the elastic force of the spring 5, so that the effect of blocking the valve port 13 can be ensured, and the valve is particularly suitable for the working scene when the extra-high pressure gas is input into the air inlet 11 of the valve body 1.

Preferably, in the present embodiment, a copper sleeve sealing ring 2811 is disposed between the copper sleeve 281 and the piston rod 26, so that gas in the valve body 1 can be prevented from leaking to the valve port 13 from a gap between the copper sleeve 281 and the piston rod 26.

Preferably, in the present embodiment, in order to further improve the air tightness of the pneumatic control valve, a front cover sealing ring 221 which is in sealing fit with the piston rod 26 is embedded in the center of the front cover 22; a first Y-shaped ring 241 which is in sealing fit with the inner wall of the cylinder 21 is embedded in the outer wall of the front end of the first piston 24, and the opening direction of the first Y-shaped ring 241 faces the front cavity 3, so that compressed gas in the front cavity 3 is prevented from leaking to the rear cavity 4; the outer wall of the rear end of the second piston 25 is embedded with a second Y-shaped ring 251 which is in sealing fit with the inner wall of the cylinder 21, and the opening direction of the second Y-shaped ring 251 faces the rear chamber 4, so that the compressed gas in the rear chamber 4 is ensured not to leak to the front chamber 3.

The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.

Claims

1. The utility model provides a gas accuse valve, includes the valve body, the valve body is equipped with air inlet, gas outlet and valve port respectively, the air inlet pass through the valve port with the gas outlet intercommunication, its characterized in that: the air cylinder comprises a cylinder body, a front cover, a rear cover, a first piston, a second piston and a piston rod, wherein the front cover and the rear cover are respectively arranged at two ends of the cylinder body, the front cover is fixedly connected with the valve body in a sealing manner, the front cover, the cylinder body and the rear cover are matched to form an accommodating space, the first piston is movably arranged in the accommodating space, the accommodating space is divided into a front cavity and a rear cavity which are mutually independent by the first piston, and the cylinder body is respectively provided with a first air hole communicated with the front cavity and a second air hole communicated with the rear cavity;

2. An air control valve according to claim 1, wherein: and a sealing gasket assembly in sealing fit with the valve port is fixedly arranged at the front end of the piston rod.

3. An air control valve according to claim 2, wherein: the sealing gasket subassembly includes copper sheathing, sealed pad and nut, the copper sheathing sealed pad reaches the nut by after to before concatenating in proper order the front end of piston rod, the piston rod be provided with the rear end limit for position complex location step of copper sheathing, the nut with piston rod threaded connection, sealed pad is pressed firmly and is located the nut with between the copper sheathing, the spring support locate the copper sheathing with between the protecgulum.

4. A pneumatic control valve according to claim 3, wherein: and a copper sleeve sealing ring is arranged between the copper sleeve and the piston rod.

5. An air control valve according to claim 1, wherein: the protecgulum pass through the bolt with valve body fixed connection, the valve body be equipped with the corresponding annular of protecgulum, the embedded ring seal that is equipped with of annular, ring seal compress tightly firmly in the valve body with between the protecgulum.

6. An air control valve according to claim 1, wherein: and a front cover sealing ring in sealing fit with the piston rod is embedded in the center of the front cover.

7. An air control valve according to claim 1, wherein: the outer wall of the front end of the first piston is embedded with a first Y-shaped ring in sealing fit with the inner wall of the cylinder body, and the opening direction of the first Y-shaped ring faces the front cavity.

8. An air control valve according to claim 1, wherein: and a second Y-shaped ring in sealing fit with the inner wall of the cylinder body is embedded in the outer wall of the rear end of the second piston, and the opening direction of the second Y-shaped ring faces the rear cavity.