CN217502712U

CN217502712U - Axial-flow type pneumatic cut-off valve

Info

Publication number: CN217502712U
Application number: CN202221179196.1U
Authority: CN
Inventors: 朱方全
Original assignee: Beijing Boda Shunyuan Natural Gas Co ltd
Current assignee: Beijing Boda Shunyuan Natural Gas Co ltd
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2022-09-27
Anticipated expiration: 2032-05-17

Abstract

The utility model discloses an axial-flow type pneumatic trip valve, include: a pneumatic actuator valve; the valve rod extends out of the execution valve body of the pneumatic execution valve; the pneumatic actuator valve includes: a touch pressure spring and a ball locking structure which are arranged in the execution valve body; the ball locking structure comprises a ball sleeve, a ball disc and balls, the ball sleeve is connected with the execution valve body in a sliding mode, an air pressure detection port communicated with the second chamber is formed in the execution valve body, a spring seat located in the first chamber is fixedly connected to the ball sleeve, and the contact pressure spring is compressed between the spring seat and the top wall of the execution valve body in a contact pressure mode; the ball disc is positioned in the second cavity and fixedly connected with the execution valve body, a through hole for embedding a ball is formed in the ball disc, and a limiting groove is formed in the valve rod; when the ball sleeve moves downwards, the balls are extruded into the limiting groove, and the rod end head is inserted into the groove body of the transmission rod; when the ball sleeve moves upwards, the ball is separated from the limiting groove, the valve rod can move axially, the compression spring pulls the transmission rod, and the end of the valve rod is separated from the groove body along the inclined plane of the groove body.

Description

Axial-flow type pneumatic cut-off valve

Technical Field

The utility model belongs to the technical field of pneumatic valve technique and specifically relates to an axial-flow type pneumatic trip valve.

Background

The pneumatic cut-off valve is one of the automatic elements in industrial production process, is an actuating mechanism in a pneumatic unit combination instrument, and can open or cut off the flowing medium of a process pipeline according to the signal of the instrument so as to meet the requirements of the system on industrial parameters such as pressure, temperature, flow and the like. The device has the characteristics of simple structure, sensitive response, reliable action and the like, and can be widely applied to industrial production departments such as petroleum, chemical industry, metallurgy and the like.

Pneumatic trip valve generally sets up on the circulation pipeline, and the inside tortuous passageway that appears of some pneumatic trip valves compares with the trip valve that only has the straight tube passageway, can produce great loss of pressure, and when gas flowed through tortuous passageway in the valve body moreover, gas can be to strikeing the pipeline wall, can produce great noise in the use, and the valve body is closed the back sealing performance not good moreover, appears the condition of leaking easily, makes the pipeline have certain potential safety hazard.

In order to solve the problems, chinese patent application with publication number CN 111734835 a discloses an axial flow type shut-off valve, the valve core moves along the axial direction of the shut-off valve itself, and has the characteristics of large flow capacity, low noise and the like, the closing direction of the valve core is the same as the gas flow direction, and the sealing performance of the shut-off valve is ensured. The specification and the attached drawings of the application disclose that the cut-off actuating mechanism 2 drives the valve core 3 to move along the axis direction of the cut-off actuating mechanism, so that the valve body is switched on and off, specifically, pressure gas is conveyed to a pressure interface 234 arranged on a piston shell 232 through a conveying gas pipeline, the gas entering a pressure cavity 233 forms a pushing force on a piston 231, when the gas pressure in the pressure cavity 233 overcomes the elastic force of a spring 237 arranged between the piston 231 and a connecting plate 238, the piston 231 moves away from a valve rod 22 after the spring 237 is compressed, the piston 231 drives a limiting rod 2311 to move away from the valve rod 22, and a steel ball 8 is separated from an annular groove of the valve rod 22, so that the valve rod 22 is in an axially movable state; the air in the air inlet cavity 11 flows into the cavity of the limiting shell 121 through the air holes 6, the air pushes the transmission rod 21 to enable the end of the valve rod 22 to slide away from the valve rod 22 along the inclined plane structure of the groove body 211, and after the end of the valve rod 22 is separated from the fixing of the valve rod 22, the valve core 3 is driven by the transmission rod 21 to close the inner cavity 12 and the air outlet cavity 13. When the pressure in the pressure chamber 233 is not enough to compress the spring 237, the piston 231 does not move, the holding steel ball 8 is placed in the annular groove of the valve rod 22, the axial fixation of the valve rod 22 is maintained, the end of the valve rod 22 is completely placed in the groove body 211, the transmission rod 21 is fixed, the valve core 3 connected with the transmission rod 21 is far away from the end face of the air outlet chamber 13 at this time, the cut-off valve is in an open state, and the inner chamber 12 is communicated with the air outlet chamber 13.

In the solution of the above patent document, the positioning and releasing of the valve rod 22 by the cut-off actuator 2 is completed along the radial direction of the valve rod 22, the cut-off actuator 2 arranged along the radial direction of the valve rod 22 occupies a large space, and in the cut-off actuator 2, when the gas pressure in the pressure chamber 233 is balanced with the elastic force of the spring 237, the cut-off actuator 2 is in a critical opening state, the valve rod 22 may be in a fixed state or in an axially movable state, and accordingly, the cut-off valve may be in an on or off state, and it is seen that the cut-off valve cannot be reliably opened or closed. Further, after the shut valve is used for a long period of time, the spring 237 is easily subjected to fatigue deformation, and the pressure against the piston 231 is reduced, which causes the pressure for shutting the shut valve to be unstable.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model aims to provide an axial-flow type pneumatic trip valve, it is little to carry out the structure that the trip valve opened and shut off to can guarantee reliably that the trip valve is in the state of opening or turn-off.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

an axial flow pneumatic shut off valve comprising: the valve comprises a valve body, a four-way limiting shell arranged in an inner cavity of the valve body, a transmission rod inserted into the limiting shell, and a valve core connected to one end of the transmission rod, wherein the valve core is positioned between the inner cavity of the valve body and an air outlet cavity, and a compression spring is arranged between the valve core and the limiting shell;

a groove body is formed in the middle of the transmission rod, one side face, close to the valve element, of the groove body is a vertical face, one side face, far away from the valve element, of the groove body is an inclined face, and a valve rod with an end matched with the inclined face of the groove body can be inserted into the groove body;

the axial flow type pneumatic cut-off valve also comprises a pneumatic execution valve which is matched and sleeved on the valve rod; the valve rod extends out of an execution valve body of the pneumatic execution valve; the pneumatic actuator valve comprises: a touch pressure spring and a ball locking structure mounted in the actuating valve body;

the ball locking structure comprises a ball sleeve, a ball disc and balls, the ball sleeve is connected with the execution valve body in a sliding mode, the ball sleeve divides the execution valve body into a first cavity and a second cavity, an air pressure detection port communicated with the second cavity is formed in the execution valve body, a spring seat located in the first cavity is fixedly connected to the ball sleeve, the touch spring is sleeved on the spring seat, the touch spring is pressed and compressed between the spring seat and the top wall of the execution valve body, and thrust is applied to the ball sleeve;

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

when the ball sleeve moves downwards, the ball is extruded into the limiting groove, the valve rod is axially positioned, and the end of the valve rod is inserted into the groove body of the transmission rod; when the ball sleeve moves upwards, the ball is separated from the limiting groove, the valve rod is axially movable, the compression spring pulls the transmission rod, and the end of the valve rod is separated from the groove body along the inclined plane of the groove body.

Further, the pneumatic actuator valve further comprises: a through cover mounted in the first chamber, pushing a screw sleeve; the contact pressure spring is in contact pressure compression between the transparent cover and the spring seat, and the pushing screw sleeve is in threaded connection with the top wall of the execution valve body and is in contact pressure on the transparent cover.

Further, the holding tank has been seted up to ball cover 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, one side of the ball disc, which is close to the ball sleeve, extends to form a second limiting part, and the first limiting part and the second limiting part are used for limiting the distance of the ball sleeve, which moves along the axial direction of the valve rod.

The pneumatic execution valve in the axial-flow pneumatic cut-off valve of the utility model is sleeved on the valve rod, when the ball sleeve moves downwards under the pressure action of the touch spring, the ball is extruded into the limiting groove and is arranged in the limiting groove of the valve rod, so as to keep the axial positioning of the valve rod, at the moment, the end head of the valve rod is kept in the groove body of the transmission rod, the valve core is driven by the transmission rod to be away from the end surface of the air outlet cavity, and the cut-off valve is in an open state; when the gas introduced into the second cavity through the gas pressure detection port overcomes the pressure of the contact pressure spring to push the ball sleeve to move upwards, the ball is separated from the limiting groove, the valve rod is in an axially movable state, the valve core is attached to the end face of the gas outlet cavity under the action of the compression spring, so that the stop valve is quickly turned off, the valve core drives the transmission rod to move towards the gas outlet cavity in the turn-off process of the stop valve, and meanwhile, the end of the valve rod is separated from the groove body along the inclined plane of the groove body; when the required cut-off valve is opened again, the valve rod can be manually touched and pressed, the pressure of the compression spring on the valve core is overcome, the end head of the valve rod is inserted into the groove body of the transmission rod, at the moment, the ball is embedded into the limiting groove of the valve rod, the axial positioning of the valve rod is completed, and the cut-off valve is kept in an open state. This pneumatic executive valve sets up along the valve rod axial, practices thrift the space, slides through the ball cover relative valve rod, makes the ball embedding or deviate from the spacing groove and accomplishes opening and shutting of trip valve, and the trip valve is in the reliability height of opening and the shutoff state.

Drawings

Fig. 1 is a schematic view of a sectional structure of an axial flow type pneumatic cut-off valve provided by an example of the present invention;

FIG. 2 is a schematic cross-sectional view of the ball of the pneumatic actuator of this example being disengaged from the stop groove of the valve stem;

FIG. 3 is a schematic cross-sectional view of a ball engaging a stop groove of a valve stem of the pneumatic actuator of the present example;

in the figure:

1-a valve body; 1-an air inlet cavity; 1-2-lumen; 1-3-air outlet cavity; 2, limiting a shell; 3, a transmission rod; 3-1-tank body; 4-valve core; 5, compressing a spring; 6-valve stem; 6-1-a limiting groove; 7-an actuator valve body; 7-1 — a first chamber; 7-2 — a second chamber; 7-3-air pressure detection port; 8, pressing a spring; 9-ball sleeve; 9-1-accommodating tank; 9-2-a first limiting part; 10-ball plate; 10-1-through hole; 10-2-a second limiting part; 11-a ball; 12-a spring seat; 13-sealing ring; 14-pushing the screw sleeve; 15-through cover; 16-end cap; 16-1-air holes; 17-balanced valve.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions of the present invention are described below clearly and completely with reference to the drawings in the examples of the present invention, and it is obvious that the described examples are only a part of examples of the present invention, but not all examples. Based on the examples in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish similar items and are not to be construed as requiring a particular order or sequence, and it is to be understood that such uses are interchangeable under appropriate circumstances.

1-3, there is provided an axial flow pneumatic trip valve comprising: the valve comprises a valve body 1, wherein the valve body 1 is provided with an air inlet cavity 1-1, an inner cavity 1-2 and an air outlet cavity 1-3 which are communicated with each other;

a four-way limiting shell 2 arranged in an inner cavity 1-2 of a valve body 1, wherein a left port and a right port of the limiting shell 2 in the figure 1 are both communicated with the inner cavity 1-2, a lower port of the limiting shell 2 is hermetically connected with the lower side wall of the valve body 1, and an upper port of the limiting shell 2 is communicated with an opening on the upper side wall of the valve body 1;

the transmission rod 3 is inserted into the limiting shell 2, the valve core 4 is connected to one end of the transmission rod 3, the valve core 4 is positioned between the inner cavity 1-2 and the air outlet cavity 1-3 of the valve body 1, the transmission rod 3 connected with the valve core 4 penetrates into the limiting shell 2 through a port, and a compression spring 5 is arranged between the valve core 4 and the limiting shell 2;

a groove body 3-1 is formed in the middle of the transmission rod 3, one side face, close to the valve core 4, of the groove body 3-1 is a vertical face, one side face, far away from the valve core 4, of the groove body 3-1 is an inclined face, and a valve rod 6 with the end matched with the inclined face of the groove body 3-1 can be inserted into the groove body 3-1;

the axial flow pneumatic cut-off valve of the present example further comprises a pneumatic actuator valve fitted over the valve stem 6; the valve rod 6 extends out of an execution valve body 7 of the pneumatic execution valve; the pneumatic actuator valve includes: a touch pressure spring 8 and a ball locking structure which are arranged in the execution valve body 7;

the ball locking structure comprises a ball sleeve 9, a ball disc 10 and balls 11, the ball sleeve 9 is connected with the execution valve body 7 in a sliding mode, the execution valve body 7 is divided into a first cavity 7-1 and a second cavity 7-2 by the ball sleeve 9, an air pressure detection port 7-3 communicated with the second cavity 7-2 is formed in the execution valve body 7, a spring seat 12 located in the first cavity 7-1 is fixedly connected to the ball sleeve 9, a touch pressure spring 8 is sleeved on the spring seat 12, the touch pressure spring 8 is pressed and compressed between the spring seat 12 and the top wall of the execution valve body 7, and thrust is applied to the ball sleeve 9;

the ball disc 10 is positioned in the second chamber 7-2 and is fixedly connected with the execution valve body 7, a through hole 10-1 for embedding a ball 11 is formed in the ball disc 10, and a limiting groove 6-1 is formed in the valve rod 6;

the inner diameter of the lower section of the ball sleeve 9 is larger than that of the upper section, when the ball sleeve 9 moves downwards, the ball 11 is extruded into the limiting groove 6-1, the valve rod 6 is axially positioned, and the end of the valve rod 6 is inserted into the groove body 3-1 of the transmission rod 3; when the ball sleeve 9 moves upwards, the ball 11 is separated from the limiting groove 6-1, the valve rod 6 can move axially, the compression spring 8 pulls the transmission rod, and the end of the valve rod 6 is separated from the groove body 3-1 along the inclined plane of the groove body 3-1.

The pneumatic execution valve in the axial-flow type pneumatic cut-off valve is sleeved on the valve rod 6, when the ball sleeve 9 moves downwards under the pressure action of the touch pressure spring 8, the ball 11 is extruded into the limiting groove 6-1, the ball 9 is arranged in the limiting groove 6-1 of the valve rod 6, the axial positioning of the valve rod 6 is kept, at the moment, the end head of the valve rod 6 is kept in the groove body 3-1 of the transmission rod 3, the valve core 4 is far away from the end face of the air outlet cavity 1-3 under the driving of the transmission rod 3, and the cut-off valve is in an open state; when the gas introduced into the second cavity 7-2 through the air pressure detection port 7-3 overcomes the pressure of the touch pressure spring 8 to push the ball sleeve 9 to move upwards, the ball 11 is separated from the limiting groove 6-1, the valve rod 6 is in an axially movable state, the valve core 4 is attached to the end surface of the gas outlet cavity 1-3 under the action of the compression spring 5, so that the cut-off valve is quickly cut off, the valve core 4 drives the transmission rod 3 to move towards the gas outlet cavity 1-3 in the cut-off process of the cut-off valve, and meanwhile, the end of the valve rod 6 is separated from the groove body 3-1 along the inclined plane of the groove body 3-1; when the cut-off valve needs to be opened again, the valve rod 6 can be manually touched and pressed to overcome the pressure of the compression spring 5 on the valve core 4, so that the end of the valve rod 6 is inserted into the groove body 3-1 of the transmission rod 3, at the moment, the ball 11 is embedded into the limiting groove 6-1 of the valve rod 6, the axial positioning of the valve rod 6 is completed, and the cut-off valve is kept in an open state. The pneumatic execution valve is arranged along the axial direction of the valve rod, the space is saved, the ball sleeve 9 slides relative to the valve rod 6, the ball 11 is embedded into or separated from the limiting groove 6-1 to complete the opening and closing of the stop valve, and the reliability of the stop valve in the opening and closing states is high.

In the example, the right port of the limiting shell 2 is sealed and fixed with the end cover 16, the side wall of the end cover 16 is provided with the air vent 16-1, the axial direction of the air vent 16-1 is vertical to the airflow direction of the air inlet cavity 1-1, and air enters the limiting shell 2 through the air vent 16-1, so that the phenomenon that the instantaneous air entering the limiting shell 2 exerts excessive pressure on the transmission rod 3 and the limiting shell 2 generates negative pressure when the transmission rod 3 moves towards the air outlet cavity 1-3 is prevented, and the stable movement of the valve core 4 is ensured.

In this example, the ball sleeve 9 has an accommodating groove 9-1 formed in the inner periphery thereof, a sealing ring 13 is embedded in the accommodating groove 9-1, and the outer periphery of the ball disk 10 abuts against the sealing ring 13 to ensure the sliding seal between the ball sleeve 9 and the ball disk 10, so that all the gas entering the second chamber 7-2 is used for pushing the ball sleeve 9.

In this example, a first position-limiting portion 9-2 extends from a side of the ball sleeve 9 close to the ball disk 10, a second position-limiting portion 10-2 extends from a side of the ball disk 10 close to the ball sleeve 9, and the first position-limiting portion 9-2 and the second position-limiting portion 10-2 are used for limiting the axial movement distance of the ball sleeve 9 along the valve rod 6. Specifically, the first limiting portion 9-2 may be annular, and is fixedly connected to a side wall of the ball sleeve 9, or may be integrally formed with the ball sleeve 9; the second limiting portion 10-2 may also be annular, and may be fixed to the sidewall of the ball tray 10, or may be integrally formed with the ball tray 10.

Referring to fig. 1, the pneumatic actuator valve of the present example further includes: a transparent cover 15 installed in the first chamber, pushing the screw sleeve 14; the contact pressure spring 8 is pressed and compressed between the transparent cover 15 and the spring seat 12, and the pushing screw sleeve 14 is in threaded connection with the top wall of the execution valve body 7 and is pressed on the transparent cover 15. The middle parts of the pushing screw sleeve 14 and the transparent cover 15 are provided with mounting holes for the valve rod to flexibly penetrate. The outer periphery of the pushing screw sleeve 14 is provided with external threads with a certain length, a threaded hole matched with the external threads of the pushing screw sleeve 14 is formed in the top wall of the execution valve body 7, the axial length of the external threads of the pushing screw sleeve 14 is larger than the thickness of the top wall of the execution valve body 7, namely the number of the external threads of the pushing screw sleeve 14 is larger than that of the threaded holes of the top wall of the execution valve body 7, the pushing screw sleeve 14 extrudes the contact pressure spring 8 to different lengths through a contact pressure through cover, pressure with different sizes is provided for the ball sleeve 9, when the cut-off valve needs larger cut-off pressure, the pushing screw sleeve 14 is screwed, and the pressure of the contact pressure spring 8 on the ball sleeve 9 is increased; when the trip valve needs less shutoff pressure, locking top pushes away the turnbuckle 14, reduces the pressure of touch pressure spring 8 to ball cover 9, through pushing away the fine setting of turnbuckle 14 to touch pressure spring 8 effect length, can the rapid adjustment trip valve shutoff pressure, makes the trip valve commonality of this example stronger.

The pneumatic cut-off valve of this example also includes a balance valve 17 disposed on the valve body 1, and the balance valve 17 is used for communicating the air inlet chamber 11 with the inner chamber 12 when the valve core 4 is closed.

Finally, it is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as the protection scope of the invention.

Claims

1. An axial flow pneumatic shut off valve comprising: the valve comprises a valve body, a four-way limiting shell arranged in an inner cavity of the valve body, a transmission rod inserted into the limiting shell, and a valve core connected to one end of the transmission rod, wherein the valve core is positioned between the inner cavity of the valve body and an air outlet cavity, and a compression spring is arranged between the valve core and the limiting shell;

the axial flow type pneumatic cut-off valve also comprises a pneumatic execution valve which is matched and sleeved on the valve rod; the pneumatic control valve is characterized in that the valve rod extends out of an execution valve body of the pneumatic execution valve; the pneumatic actuator valve comprises: a touch pressure spring and a ball locking structure mounted in the actuating valve body;

the ball disc is positioned in the second cavity and fixedly connected with the execution valve body, a through hole for the ball to be embedded is formed in the ball disc, and a limiting groove is formed in the valve rod.

2. The axial flow pneumatic shut off valve of claim 1 wherein the pneumatic actuator valve further comprises: a through cover mounted in the first chamber, pushing a screw sleeve; the contact pressure spring is in contact pressure compression between the transparent cover and the spring seat, and the pushing screw sleeve is in threaded connection with the top wall of the execution valve body and is in contact pressure on the transparent cover.

3. The axial flow type pneumatic cutoff valve according to claim 1, wherein a receiving groove is formed in an inner periphery of the ball sleeve, a seal ring is embedded in the receiving groove, and an outer periphery of the ball disc abuts against the seal ring.

4. The axial flow type pneumatic cutoff valve according to claim 1, wherein a first limiting portion extends from a side of the ball sleeve close to the ball disc, a second limiting portion extends from a side of the ball disc close to the ball sleeve, and the first limiting portion and the second limiting portion are used for limiting the distance of the ball sleeve moving along the axial direction of the valve rod.