CN212899790U

CN212899790U - Axial-flow type cut-off valve

Info

Publication number: CN212899790U
Application number: CN202021529693.0U
Authority: CN
Inventors: 王海龙; 李妍; 许忠丽; 赵树杰
Original assignee: Terrence Energy Co ltd
Current assignee: Terrence Energy Co ltd
Priority date: 2020-07-28
Filing date: 2020-07-28
Publication date: 2021-04-06
Anticipated expiration: 2030-07-28

Abstract

The utility model relates to a pneumatic valve technical field especially relates to an axial-flow type trip valve, include: the valve body, cut off actuating mechanism, the case, balanced valve, be equipped with the chamber of admitting air of intercommunication in proper order according to the gas flow direction in the valve body, inner chamber and play air cavity, the case sets up between inner chamber and play air cavity, including cutting off the local setting of actuating mechanism, cut off actuating mechanism output power and drive the case and remove along self axis direction, thereby realize the break-make between inner chamber and the play air cavity, balanced valve sets up on the valve body, balanced valve is used for intercommunication chamber and the inner chamber of admitting air when the case is closed, the utility model discloses well case is under the drive that cuts off actuating mechanism, removes along self axis direction, thereby realizes the switch of valve, and it is big to have the circulation, and the noise low grade characteristics, and the direction of closing of case is the same with the gas flow direction, has guaranteed the leakproofness of trip.

Description

Axial-flow type cut-off valve

Technical Field

The utility model relates to a pneumatic valve technical field especially relates to an axial-flow type 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.

Among the prior art, general trip valve is on the setting of circulation pipeline, and inside tortuous passageway appears, compares with the trip valve of approximate straight tube class, can produce great loss of pressure, and gas is when the inside circulation of valve body moreover, owing to the impact to the pipeline wall, can produce great noise in the use, and when the case was closed moreover, inseparable enough, the condition of leaking appears easily, has great influence to the security of pipeline.

In view of the above problems, the designer actively makes research and innovation based on the practical experience and professional knowledge that the product engineering is applied for many years, so as to create an axial-flow type cut-off valve, which is more practical.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: an axial flow type shut-off valve is provided to solve the problems in the background art.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

an axial flow shut off valve comprising: the valve comprises a valve body, a cut-off actuating mechanism, a valve core and a balance valve;

the valve body is sequentially provided with an air inlet cavity, an inner cavity and an air outlet cavity which are communicated with each other according to the gas flowing direction, and the valve core is arranged between the inner cavity and the air outlet cavity;

the cutting-off actuating mechanism is partially arranged in the inner cavity, and the cutting-off actuating mechanism outputs power to drive the valve core to move along the axis direction of the cutting-off actuating mechanism, so that the connection and disconnection between the inner cavity and the air outlet cavity are realized;

the balance valve is arranged on the valve body and is used for communicating the air inlet cavity with the inner cavity when the valve core is closed.

Furthermore, the cut-off executing mechanism at least comprises a transmission rod, a valve rod and a compression spring, wherein the axis of the transmission rod is perpendicular to the axis of the valve rod, a limiting shell is arranged outside the transmission rod and the valve rod and used for limiting the movement direction of the transmission rod and the valve rod so that the transmission rod and the valve rod can only move along the axis direction of the transmission rod and the valve rod, one end of the transmission rod is connected with the valve core, the compression spring is arranged between the valve core and the limiting shell, a groove body is arranged on one side of the transmission rod close to the valve rod, one side of the groove body close to the valve core is of a vertical surface structure, one side of the groove body far away from the valve core is of an inclined surface structure, the end of the valve rod is inserted into the groove, the valve rod is pulled to move away from the transmission rod, so that the contact surface of the end of the groove body and the end of the valve rod is reduced, the valve core is driven by the elasticity of the compression spring to move close to the air outlet cavity until the valve core is in contact with the air outlet cavity, so that the axial flow type cut-off valve is closed, the valve rod is pushed to move close to the transmission rod, so that the contact surface of the end of the groove body and the end of the valve rod is increased, the valve core is driven by the transmission rod to move away from the air outlet cavity until the valve core is not in.

Furthermore, a soft sealing structure is arranged on the contact surface of the valve core and the air outlet cavity, the soft sealing structure comprises a trapezoidal groove formed in the valve core and a sealing ring arranged in the trapezoidal groove, and a hard sealing surface is further arranged on the contact surface of the valve core and the air outlet cavity and forms a double sealing structure with the soft sealing structure.

Furthermore, the limiting shell is provided with air holes, the air holes conduct air inside and outside the limiting shell, and resistance is prevented from being generated to axial movement of the transmission rod due to pressure difference inside and outside the limiting shell.

Furthermore, the interfaces at the two ends of the valve body are in butt joint connection with the communicating pipeline through flanges.

Furthermore, the valve body is provided with a threaded sleeve at the air outlet cavity, and the threaded sleeve is embedded in the air outlet cavity and fixedly connected with the air outlet cavity through threads.

Further, the cut-off executing mechanism further comprises a pneumatic unit and a reset unit, the pneumatic unit comprises a piston and a piston shell arranged outside the piston, the piston is connected with the piston shell in a dynamic sealing mode, the piston can move along the axis of the piston, the piston is perpendicular to the valve rod, a limiting rod is arranged on the end face, close to the valve rod, of the piston, the diameter of the limiting rod is smaller than that of the piston, the limiting rod can be driven by the piston to be close to the side portion of the valve rod and axially limit the valve rod, an annular pressure cavity is formed between the end, provided with the limiting rod, of the piston and the piston shell, a pressure interface is arranged on the piston shell, the external conveying gas pipeline is communicated with the pressure cavity, and the external conveying gas enters the pressure cavity through the pressure interface to form driving force for the piston, make the piston keep away from the valve rod motion, piston housing keeps away from valve rod one end is connected with pressure regulating unit, pressure regulating unit is used for adjusting predetermine piston axial motion's reaction force, reset unit includes manual cutting off axle and dwang, manual cutting off axle includes along self axis pivoted camshaft and the end that sets up in camshaft one end, the camshaft is installed piston housing's inside, gag lever post one side is seted up flutedly, the end enters into in the recess, the end includes two relative circular arc curved surface and two planes that set up, change through rotating the camshaft the circular arc curved surface or the plane of end contradict with the inner wall of recess, thereby make the piston take place axial displacement, manual cutting off the off the off-axial portion with the dwang is connected, the axis of dwang is perpendicular to the axis of camshaft, the circumference rotates the dwang drives manual cut-off shaft rotates along self axis.

Furthermore, the steel ball is arranged at the contact position of the limiting rod and the side face of the valve rod, an arc-shaped groove is formed in the limiting rod, an annular groove is formed in the valve rod, and the arc-shaped groove and the annular groove form a cavity for containing the steel ball.

Further, the pressure adjusting unit comprises an adjusting shell, a spring, a connecting plate and an adjusting screw rod, the adjusting shell is connected with the piston shell, an inner cavity of the adjusting shell is communicated with the piston shell, the spring and the connecting plate are located in the inner cavity of the adjusting shell, one end of the spring is connected with the piston, the other end of the spring is connected with the connecting plate, and the adjusting screw rod is screwed into a threaded hole in the adjusting shell and connected with the connecting plate.

The utility model has the advantages that: the utility model provides a case removes along self axis direction under the drive that cuts off actuating mechanism to realize the switch of valve, it is big to have a traffic, and the noise low grade characteristics, the direction of closing of case is the same with the gas flow direction, has guaranteed the leakproofness of trip valve, moreover the utility model discloses a piston cuts off actuating mechanism, and it is high to possess intensity, and stability is good advantage is particularly useful for installing at highly compressed gas line, possesses the practicality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural view of an axial flow type cut-off valve in an embodiment of the present invention;

fig. 2 is a sectional view of an axial flow type cut-off valve in an embodiment of the present invention;

FIG. 3 is a schematic structural view of a valve rod and a transmission rod according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the valve element in the embodiment of the present invention;

fig. 5 is a schematic structural diagram of a cutting actuator according to an embodiment of the present invention;

fig. 6 is a sectional view of a cutting actuator according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a manual cutting shaft according to an embodiment of the present invention.

Reference numerals: the valve comprises a valve body 1, a cutting-off actuating mechanism 2, a valve core 3, a balance valve 4, a compression spring 5, an air vent 6, a threaded sleeve 7, a steel ball 8, an air inlet cavity 11, an inner cavity 12, an air outlet cavity 13, a transmission rod 21, a valve rod 22, a pneumatic unit 23, a reset unit 24, a trapezoidal groove 31, a sealing ring 32, a limiting shell 121, a groove body 211, a piston 231, a piston shell 232, a pressure cavity 233, a pressure interface 234, a pressure adjusting unit 235, an adjusting shell 236, a spring 237, a connecting plate 238, an adjusting screw 239, a manual cutting-off shaft 241, a rotating rod 242, a cam shaft 243, a tip 244, a limiting rod 2311 and a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

An axial flow shut-off valve as shown in fig. 1 and 2, comprising: the valve comprises a valve body 1, a cut-off actuating mechanism 2, a valve core 3 and a balance valve 4;

the valve body 1 is sequentially provided with an air inlet cavity 11, an inner cavity 12 and an air outlet cavity 13 which are communicated with each other according to the air flowing direction, and the valve core 3 is arranged between the inner cavity 12 and the air outlet cavity 13;

the cutting-off actuating mechanism 2 is partially arranged in the inner cavity 12, and the cutting-off actuating mechanism 2 outputs power to drive the valve core 3 to move along the axis direction of the cutting-off actuating mechanism 2, so that the connection and disconnection between the inner cavity 12 and the air outlet cavity 13 are realized;

the balance valve 4 is arranged on the valve body 1, and the balance valve 4 is used for communicating the air inlet cavity 11 with the inner cavity 12 when the valve core 3 is closed.

As a preferred example of the above embodiment, as shown in fig. 2 and 3, the cut-off actuator 2 at least includes a transmission rod 21, a valve rod 22, and a compression spring 5, an axis of the transmission rod 21 is perpendicular to an axis of the valve rod 22, a limiting housing 121 is disposed outside the transmission rod 21 and the valve rod 22, the limiting housing 121 is used to limit a movement direction of the transmission rod 21 and the valve rod 22, so that the transmission rod 21 and the valve rod 22 both move only along the axis direction, one end of the transmission rod 21 is connected to the valve core 3, the compression spring 5 is disposed between the valve core 3 and the limiting housing 121, a groove 211 is disposed on a side of the transmission rod 21 close to the valve rod 22, a side of the groove 211 close to the valve core 3 is a vertical surface structure, a side of the groove 211 far away from the valve core 3 is an inclined surface structure, an end of the valve rod 22 is an inclined surface structure, an end, make the end contact surface of cell body 211 and valve rod 22 reduce, case 3 is close to the motion of going out the air cavity 13 under the drive of compression spring 5 elasticity, makes the axial-flow type trip valve close until coming into contact with going out air cavity 13, promotes valve rod 22 and is close to transfer line 21 motion, makes cell body 211 and valve rod 22's end contact surface increase, and case 3 keeps away from out air cavity 13 motion under the drive of transfer line 21, makes the axial-flow type trip valve open until going out air cavity 13 contactless, the utility model provides a closing direction of case 3 is the same with the gas flow direction, after case 3 closes, because the pressure difference between inner chamber 12 and the air cavity 13 of going out for case 3 closely laminates in air cavity 13 department, and the leakproofness is good. The circulation direction between the chambers of the gas entering the cut-off valve is not changed, the gas is blocked little in the circulation, the noise is low, and the like.

As shown in fig. 4, in order to prevent gas leakage when the valve of the shut-off valve is closed, a soft sealing structure is arranged on the contact surface of the valve core 3 and the gas outlet cavity 13, the soft sealing structure comprises a trapezoidal groove 31 formed on the valve core 3 and a sealing ring 32 arranged in the trapezoidal groove 31, and for being applicable to a high-pressure gas environment, a hard sealing surface is further arranged on the contact surface of the valve core 3 and the gas outlet cavity 13, and a double-sealing structure is formed by the hard sealing surface and the soft sealing structure.

As shown in fig. 2, the limiting housing 121 is preferably provided with a vent hole 6, and the vent hole 6 conducts gas inside and outside the limiting housing 121, so as to prevent resistance generated by pressure difference inside and outside the limiting housing 121 on axial movement of the transmission rod 21.

As shown in figure 1, the interfaces at the two ends of the valve body 1 are in butt joint with the communicating pipeline through flanges, so that the installation is convenient.

As shown in fig. 2, in order to facilitate installation and entry of parts in the inner cavity 12, the valve body 1 is provided with the threaded sleeve 7 at the air outlet cavity 13, the threaded sleeve 7 is embedded in the air outlet cavity 13 and fixedly connected with the air outlet cavity 13 through threads, the valve core 3 and the transmission rod 21 to be installed in the inner cavity 12 are firstly placed in through the air outlet cavity 13, and then the threaded sleeve 7 is installed, so that installation of the cut-off valve is greatly facilitated.

As a preferred embodiment, as shown in fig. 5 to 7, the cutting actuator 2 further includes a pneumatic unit 23 and a reset unit 24, the pneumatic unit includes a piston 231 and a piston housing 232 disposed outside the piston 231, the piston 231 is connected to the piston housing 232 in a dynamic sealing manner, the piston 231 can move along its own axis, the piston 231 is perpendicular to the valve rod 22, a stop rod 2311 is disposed on an end surface of the piston 231 close to the valve rod 22, a diameter of the stop rod 2311 is smaller than that of the piston 231, the stop rod 2311 can be close to a side of the valve rod 22 and axially limit the valve rod 22 under the driving of the piston 231, an annular pressure chamber is formed between one end of the piston 231, which is provided with the stop rod 2311, and the piston housing 232 is provided with a pressure interface 234 through which an external conveying gas pipeline communicates with the pressure chamber 233, the external conveying gas enters the pressure chamber 233 through the pressure interface 234 to form a pushing force on the piston, the piston 231 is moved away from the valve rod 22, one end of the piston housing 232, which is away from the valve rod 22, is connected with a pressure adjusting unit 235, the pressure adjusting unit 235 is used for adjusting a reaction force preset in the axial movement of the piston, the reset unit 24 comprises a manual cutting shaft 241 and a rotating rod 242, the manual cutting shaft 241 comprises a cam shaft 243 rotating along the axis of the manual cutting shaft 241 and a head 244 arranged at one end of the cam shaft 243, the cam shaft 243 is installed inside the piston housing 232, a groove 2312 is formed in one side of a limiting rod 2311, the head 244 enters the groove 2312, the head 244 comprises two arc curved surfaces and two planes which are arranged oppositely, the arc curved surface or the plane of the head 244 is changed to be in interference with the inner wall of the groove 2312 by rotating the cam shaft 243, so that the piston 231 is moved axially, the outer part of the manual cutting shaft 241 is connected with the, the manual cut-off shaft 241 is rotated along its axis by the circular rotation rotating rod 242.

As shown in fig. 6, in order to facilitate the axial sliding of the valve rod 22, a steel ball 8 is disposed at a contact position of the limiting rod 2311 and the side surface of the valve rod 22, an arc-shaped groove is disposed on the limiting rod 2311, an annular groove is disposed on the valve rod 22, and the arc-shaped groove and the annular groove form a cavity for accommodating the steel ball 8.

As a preferable example of the above embodiment, as shown in fig. 5 and 6, the pressure adjustment unit 235 includes an adjustment housing 236, a spring 237, a coupling plate 238, and an adjustment screw 239, the adjustment housing 236 is connected to the piston housing 232, an inner cavity of the adjustment housing 236 is communicated with the piston housing 232, the spring 237 and the coupling plate 238 are both located in the inner cavity of the adjustment housing 236, one end of the spring 237 is connected to the piston 231, the other end of the spring 237 is connected to the coupling plate 238, the adjustment screw 239 is screwed into a threaded hole of the adjustment housing 236 and connected to the coupling plate 238, the length of the spring is changed by screwing the adjustment screw 239 into the threaded hole, and the elastic force of the spring is changed so that the force applied to the axial movement of the piston 231 is changed, thereby changing the preset reaction force.

It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An axial flow shut-off valve, comprising: the valve comprises a valve body (1), a cut-off actuating mechanism (2), a valve core (3) and a balance valve (4);

an air inlet cavity (11), an inner cavity (12) and an air outlet cavity (13) which are communicated with each other are sequentially arranged in the valve body (1) according to the air flowing direction, and the valve core (3) is arranged between the inner cavity (12) and the air outlet cavity (13);

the cutting-off actuating mechanism (2) is locally arranged in the inner cavity (12), and the cutting-off actuating mechanism (2) outputs power to drive the valve core (3) to move along the axis direction of the cutting-off actuating mechanism, so that the inner cavity (12) and the air outlet cavity (13) are switched on and off;

the balance valve (4) is arranged on the valve body (1), and the balance valve (4) is used for communicating the air inlet cavity (11) with the inner cavity (12) when the valve needs to be opened so as to reduce the opening resistance.

2. The axial flow type cut-off valve according to claim 1, wherein the cut-off actuator (2) at least comprises a transmission rod (21), a valve rod (22) and a compression spring (5), the axis of the transmission rod (21) is perpendicular to the axis of the valve rod (22), a limiting shell (121) is arranged outside the transmission rod (21) and the valve rod (22), the limiting shell (121) is used for limiting the movement direction of the transmission rod (21) and the valve rod (22) so that the transmission rod (21) and the valve rod (22) can only move along the axis direction of the limiting shell, one end of the transmission rod (21) is connected with the valve core (3), the compression spring (5) is arranged between the valve core (3) and the limiting shell (121), and a groove body (211) is arranged on one side of the transmission rod (21) close to the valve rod (22), the side that cell body (211) is close to case (3) is vertical face structure, cell body (211) are kept away from a side of case (3) is the inclined plane structure, the end of valve rod (22) is inserted in cell body (211) just the end of valve rod (22) with the inclined plane laminating of cell body (211), the pulling valve rod (22) are kept away from the motion of transfer line (21), make cell body (211) with the end contact surface of valve rod (22) reduces, case (3) are in compression spring (5) elasticity drives down and is close to play air cavity (13) motion, make axial-flow type trip valve close until with going out air cavity (13) contact, promote valve rod (22) are close to transfer line (21) motion makes cell body (211) with the end contact surface of valve rod (22) increases, the valve core (3) is driven by the transmission rod (21) to move away from the air outlet cavity (13) until the valve core is not in contact with the air outlet cavity (13) so that the axial flow type cut-off valve is opened.

3. The axial flow type cut-off valve according to claim 1 or 2, characterized in that a soft sealing structure is arranged on the contact surface of the valve core (3) and the air outlet cavity (13), and the soft sealing structure comprises a trapezoidal groove (31) arranged on the valve core (3) and a sealing ring (32) arranged in the trapezoidal groove (31).

4. The axial flow type cut-off valve of claim 2, wherein the limiting shell (121) is provided with a vent hole (6), the vent hole (6) conducts gas inside and outside the limiting shell (121), and resistance is prevented from being generated on the axial movement of the transmission rod (21) due to pressure difference inside and outside the limiting shell (121).

5. The axial flow shut-off valve as claimed in claim 1 or 2, characterised in that the interfaces at both ends of the valve body (1) are in butt joint with the communication pipe through flanges.

6. The axial flow shut-off valve according to claim 1 or 2, characterized in that the valve body (1) is provided with a threaded sleeve (7) at the outlet cavity (13), the threaded sleeve (7) is embedded in the outlet cavity (13) and fixedly connected with the outlet cavity (13) by threads.

7. The axial flow type cut-off valve of claim 2, wherein the cut-off actuator (2) further comprises a pneumatic unit (23) and a reset unit (24), the pneumatic unit comprises a piston (231) and a piston housing (232) arranged outside the piston (231), the piston (231) is in dynamic sealing connection with the piston housing (232), the piston (231) can move along the axis of the piston (231), the piston (231) is perpendicular to the valve rod (22), a limit rod (2311) is arranged on the end surface of the piston (231) close to the valve rod (22), the diameter of the limit rod (2311) is smaller than that of the piston (231), the limit rod (2311) can be close to the side of the valve rod (22) under the driving of the piston (231) and axially limit the valve rod (22), and annular pressure is formed between one end of the piston (231) provided with the limit rod (2311) and the piston housing (232) Chamber (233), be provided with on piston housing (232) supply external conveying gas pipeline with pressure port (234) that pressure chamber (233) communicate, external conveying gas enters into through pressure port (234) pressure chamber (233) is right piston (231) form the impetus, make piston (231) keep away from valve rod (22) motion, piston housing (232) is kept away from valve rod (22) one end is connected with pressure regulating unit (235), pressure regulating unit (235) are used for adjusting predetermine piston axial motion's reaction force, reset unit (24) include manual cut-off shaft (241) and dwang (242), manual cut-off shaft (241) include along self axis pivoted camshaft (243) and set up end (244) of camshaft (243) one end, camshaft (243) install the inside of piston housing (232), the limiting rod (2311) is provided with a groove (2312) on one side, the end head (244) enters the groove (2312), the end head (244) comprises two arc curved surfaces and two planes which are oppositely arranged, the arc curved surfaces or the planes of the end head (244) are changed to be abutted against the inner wall of the groove (2312) by rotating the cam shaft (243), so that the piston (231) moves axially, the outside of the manual cutting shaft (241) is connected with the rotating rod (242), the axis of the rotating rod (242) is perpendicular to the axis of the cam shaft (243), and the rotating rod (242) is rotated circumferentially to drive the manual cutting shaft (241) to rotate along the axis of the manual cutting shaft (241).

8. The axial flow type cut-off valve of claim 7, characterized in that a steel ball (8) is arranged at the contact position of the limiting rod (2311) and the side surface of the valve rod (22), an arc-shaped groove is arranged on the limiting rod (2311), an annular groove is arranged on the valve rod (22), and the arc-shaped groove and the annular groove form a cavity for accommodating the steel ball (8).

9. The axial flow shut-off valve of claim 7, wherein the pressure adjustment unit (235) comprises an adjustment housing (236), a spring (237), an attachment plate (238), and an adjustment screw (239), the adjustment housing (236) is connected to the piston housing (232), the inner cavity of the adjustment housing (236) is in communication with the piston housing (232), the spring (237) and the attachment plate (238) are both located in the inner cavity of the adjustment housing (236), one end of the spring (237) is connected to the piston (231), the other end of the spring (237) is connected to the attachment plate (238), and the adjustment screw (239) is screwed into a threaded hole in the adjustment housing (236) to connect to the attachment plate (238).