CN210068950U

CN210068950U - Pneumatic two-position cut-off valve with overlong guide valve rod

Info

Publication number: CN210068950U
Application number: CN201920556198.XU
Authority: CN
Inventors: 吴金海
Original assignee: Zhongshan Sea Self Control Valve Co Ltd
Current assignee: Zhongshan Sea Self Control Valve Co Ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-02-14
Anticipated expiration: 2029-04-23

Abstract

The utility model discloses a pneumatic two-position cut-off valve with an overlong guide valve rod, which comprises a vertical valve rod, a valve body, a bracket and a cylinder, wherein the lower end of the valve rod is positioned in the valve body and is fixedly connected with a valve core, the upper end of the valve rod is positioned in a sealing cavity formed by the bracket and the cylinder and is in transmission connection with a piston, and a compression spring is also arranged between the bracket and the cylinder; the method is characterized in that: the upper end of the valve body is provided with a packing box sleeved outside the valve rod, the bottom of the support is provided with a connecting arm, and the bottom of the connecting arm is provided with a connecting ring sleeved outside the lower portion of the packing box. The utility model can reduce the unilateral abrasion of the cylinder and make the piston act smoothly; in addition, through further improvement, the sealing structure of the stuffing box, the connecting structure of the air cylinder and the support and the connecting structure of the support and the valve body are optimized, and the overall performance stability of the product and the sealing performance of the stuffing box are effectively improved.

Description

Pneumatic two-position cut-off valve with overlong guide valve rod

Technical Field

The utility model relates to a pneumatic two-position trip valve product technical field, especially a pneumatic two-position trip valve of overlength direction of valve rod.

Background

The pneumatic two-position cut-off valve is a valve control device with the advantages of stable performance, simple structure, sensitive reaction, reliable action, easy disassembly and assembly and the like, and can be widely applied to automatic control systems in industries such as rubber tires, petroleum, chemical engineering, metallurgy, adhesive products and the like. Pneumatic two-position trip valve is according to the control demand of difference, and its pneumatic action can be divided into two types of positive action gas open and reaction gas closed:

the positive-acting air-operated valve is characterized in that an air source (filtered clean compressed air) is introduced into the positive-acting air-operated valve through an air inlet interface at the top of an air cylinder to generate pressure, so that a piston generates displacement thrust to act on a spring seat, the spring seat pushes a spring to compress and simultaneously pushes a valve rod to move downwards to open a valve or make the valve complete reversing action, and when the air source is cut off, a return spring drives the valve rod to move reversely to close the valve or make the valve complete reversing action; the reverse gas-closing type is characterized in that a gas source is led in through a gas inlet interface on the side surface of the support to generate pressure, so that the piston generates displacement thrust to act on the spring seat, the spring seat pushes the spring to compress and simultaneously pushes the valve rod to move upwards to close the valve or enable the valve to complete reversing action, and when the gas source is cut off, the valve rod is driven by the return spring to move in the reverse direction to open the valve or enable the valve to complete reversing action.

The pneumatic two-position cut-off valve in the prior art mainly has the following defects: firstly, the piston can be subjected to the irregular acting force of the return spring during reciprocating action, and the irregular force can cause the piston and the cylinder to generate local friction resistance, so that the single side of the cylinder is abraded and the piston action is not smooth; in addition, the connection structure of the cylinder and the bracket and the connection structure of the bracket and the valve body are complex, and the assembly and disassembly operation efficiency of the actuating mechanism and the assembly and disassembly operation efficiency of all parts of the valve body are low during maintenance; the secondary actuating mechanism is connected with the valve rod through the push rod and the bolt, the connecting bolt is prone to being broken and damaged in the using process, and the temperature born by the internal sealing assembly at the position of the stuffing box is high in the operation process of the pneumatic cut-off valve, so that the leakage frequency of the stuffing box is prone to rising in the high-frequency action process.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a pneumatic two-position cut-off valve with an overlong guide valve rod, which can reduce the unilateral abrasion of a cylinder and make the piston act smoothly; in addition, through further improvement, the sealing structure of the stuffing box, the connecting structure of the air cylinder and the support and the connecting structure of the support and the valve body are optimized, and the overall performance stability of the product and the sealing performance of the stuffing box are effectively improved.

The utility model provides a technical scheme that its technical problem adopted is:

a pneumatic two-position cut-off valve with an overlong guide valve rod comprises a vertical valve rod, a valve body, a support and a cylinder, wherein the lower end of the valve rod is positioned in the valve body and is fixedly connected with a valve core, the upper end of the valve rod is positioned in a sealing cavity formed by the support and the cylinder and is in transmission connection with a piston, and a compression spring is also arranged between the support and the cylinder; the upper end of the valve body is provided with a packing box sleeved outside the valve rod, the bottom of the support is provided with a connecting arm, and the bottom of the connecting arm is provided with a connecting ring sleeved outside the lower portion of the packing box.

As a further improvement of the technical scheme, a compression nut sleeved outside the valve rod is arranged at the top of the stuffing box, and a dustproof sleeve is arranged between the compression nut and the valve rod; and a support guide sleeve is arranged between the bottom wall of the support and the valve rod.

As a further improvement of the technical scheme, an annular bottom wall is arranged on the inner side of the bottom of the stuffing box, and a valve rod guide sleeve is arranged on the annular bottom wall; and a packing component is arranged between the annular bottom wall and the compression nut, is annular and is positioned between the packing box and the valve rod.

As a further improvement of the technical scheme, the packing assembly comprises an upper packing pad, a packing, a lower packing pad and a packing spring which are sequentially arranged from top to bottom, a plurality of layers of packing gaskets are arranged in the packing, and the radial section of each packing gasket is of an inverted V-shaped structure.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a pneumatic two-position trip valve of overlength direction of valve rod, because the support is provided with linking arm and go-between, and the valve body is provided with the packing box, fixed by gland nut again behind the go-between cooperation packing box, the packing pad that sets up about support guide pin bushing, valve rod guide pin bushing and the packing moreover is in same axis, makes the valve rod have overlength direction, and the action is steady more accurate.

Secondly, the cylinder adopts threaded connection with the support, adopt hexagon socket head cap screw connected mode installation after support and valve body adopt closely to cooperate to insert, positive cylinder top sets up the hexagon head structure, the reaction cylinder is equipped with the spanner screens, the cylinder is dismantled fast to the ordinary spanner of facilitate to use, this kind of structural design is because the cooperation between each part is more accurate, tight urge and more convenient dismantlement, actuating mechanism is inside also cleaner, the overall stability of valve has been improved greatly, can effectively reduce the maintenance intensity of labour in the product use.

And thirdly, the valve rod part is sealed by adopting V-shaped packing, an elastic stainless steel packing gasket is adopted between the adjacent V-shaped packing layers for supporting, an upper packing cushion and a lower packing cushion are arranged, a stainless steel packing spring and a valve rod guide sleeve are sequentially arranged at the bottom of the lower packing cushion, and the V-shaped packing has an automatic abrasion compensation function due to the existence of the pretightening force of the packing spring.

In addition, according to different control requirements, the positive acting air cylinder and the spring are positively arranged and the top of the air cylinder is used for air inlet to realize the air opening action of the valve, or the reverse acting air cylinder and the spring are reversely arranged and the side of the bracket is used for air inlet to realize the air closing action of the valve.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a schematic sectional view showing the structure of embodiment 1;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic structural view of the embodiment 1;

FIG. 4 is a schematic sectional view showing the structure of example 2;

fig. 5 is a schematic structural diagram of the appearance of embodiment 2.

Detailed Description

Detailed description of the preferred embodiment 1

Referring to fig. 1 to 3, fig. 1 to 3 are pneumatic two-position cut-off valves with an ultra-long guide valve rod provided in this embodiment, and the valve is opened by positive acting cylinder and spring positive mounting and cylinder top air intake, and the structure mainly includes:

the valve comprises a vertical valve rod 1, a valve body 2, a support 3 and a cylinder 4, wherein the lower end of the valve rod 1 is positioned in the valve body 2 and is fixedly connected with a valve core 5, the upper end of the valve rod 1 is positioned in a sealing cavity formed by the support 3 and the cylinder 4 and is in transmission connection with a piston 6, and a compression spring 7 is also arranged between the support 3 and the cylinder 4; the upper end of the valve body 2 is provided with a packing box 8 which is sleeved outside the valve rod 1, the bottom of the support 3 is provided with a connecting arm 9, and the bottom of the connecting arm 9 is provided with a connecting ring 10 which is sleeved outside the lower part of the packing box 8. The top of the cylinder 4 is provided with an air inlet 21, the bottom of the piston 6 is provided with a spring seat 22 fixedly connected with the upper end of the valve rod 1, and the compression spring 7 is positioned between the spring seat 22 and the bottom wall of the bracket 3.

Specifically, a compression nut 11 sleeved outside the valve rod 1 is arranged at the top of the stuffing box 8, and a dustproof sleeve 12 is arranged between the compression nut 11 and the valve rod 1; and a support guide sleeve 13 is arranged between the bottom wall of the support 3 and the valve rod 1. An annular bottom wall 14 is arranged on the inner side of the bottom of the stuffing box 8, and a valve rod guide sleeve 15 is arranged on the annular bottom wall 14; a packing component is arranged between the annular bottom wall 14 and the compression nut 11, is annular and is positioned between the packing box 8 and the valve rod 1. The packing assembly comprises an upper packing pad 16, a packing 17, a lower packing pad 18 and a packing spring 19 which are sequentially arranged from top to bottom, wherein a plurality of layers of packing pads 20 are arranged in the packing 17, and the radial section of each packing pad 20 is of an inverted V-shaped structure.

Detailed description of the preferred embodiment 1

Referring to fig. 4 to 5, fig. 4 to 5 are pneumatic two-position cut-off valves with an ultra-long guiding valve rod provided in this embodiment, and the valve is opened by positive acting cylinder and spring positive mounting and cylinder top air intake, and the structure mainly includes:

the valve comprises a vertical valve rod 1, a valve body 2, a support 3 and a cylinder 4, wherein the lower end of the valve rod 1 is positioned in the valve body 2 and is fixedly connected with a valve core 5, the upper end of the valve rod 1 is positioned in a sealing cavity formed by the support 3 and the cylinder 4 and is in transmission connection with a piston 6, and a compression spring 7 is also arranged between the support 3 and the cylinder 4; the upper end of the valve body 2 is provided with a packing box 8 which is sleeved outside the valve rod 1, the bottom of the support 3 is provided with a connecting arm 9, and the bottom of the connecting arm 9 is provided with a connecting ring 10 which is sleeved outside the lower part of the packing box 8. An air receiving opening 21 is formed in the side face of the support 3, a spring seat 22 fixedly connected with the upper end of the valve rod 1 is arranged at the top of the piston 6, and the compression spring 7 is located between the spring seat 22 and the top wall of the cylinder 4.

It will be readily understood by those skilled in the art that: in fig. 1, 3 and 4, the valve body 2 adopts a flange connection structure; in fig. 5, the valve body 2 is in a threaded connection.

While the preferred embodiments of the present invention have been described, it is to be understood that the present invention may be embodied in other forms than those described above, and that equivalent changes and modifications made by those skilled in the art without departing from the spirit of the present invention are intended to be included within the scope of the present invention.

Claims

1. A pneumatic two-position cut-off valve with an overlong guide valve rod comprises a vertical valve rod (1), a valve body (2), a support (3) and a cylinder (4), wherein the lower end of the valve rod (1) is positioned in the valve body (2) and is fixedly connected with a valve core (5), the upper end of the valve rod (1) is positioned in a sealing cavity formed by the support (3) and the cylinder (4) and is in transmission connection with a piston (6), and a compression spring (7) is further arranged between the support (3) and the cylinder (4); the method is characterized in that: the upper end of the valve body (2) is provided with a packing box (8) which is sleeved outside the valve rod (1), the bottom of the support (3) is provided with a connecting arm (9), and the bottom of the connecting arm (9) is provided with a connecting ring (10) which is sleeved outside the lower part of the packing box (8).

2. The pneumatic two-position stop valve with the overlength guiding valve rod according to claim 1, is characterized in that: a compression nut (11) sleeved outside the valve rod (1) is arranged at the top of the stuffing box (8), and a dustproof sleeve (12) is arranged between the compression nut (11) and the valve rod (1); a support guide sleeve (13) is arranged between the bottom wall of the support (3) and the valve rod (1).

3. The pneumatic two-position stop valve with the overlength guiding valve rod as claimed in claim 2, characterized in that: an annular bottom wall (14) is arranged on the inner side of the bottom of the stuffing box (8), and a valve rod guide sleeve (15) is arranged on the annular bottom wall (14); a packing component is arranged between the annular bottom wall (14) and the compression nut (11), is annular and is positioned between the packing box (8) and the valve rod (1).

4. The pneumatic two-position stop valve with the overlength guiding valve rod as claimed in claim 3, characterized in that: the packing assembly comprises an upper packing pad (16), a packing (17), a lower packing pad (18) and a packing spring (19) which are sequentially arranged from top to bottom, wherein a plurality of layers of packing gaskets (20) are arranged in the packing (17), and the radial section of each packing gasket (20) is of an inverted V-shaped structure.

5. The pneumatic two-position stop valve with the overlength guiding valve rod according to claim 1, is characterized in that: the top of the cylinder (4) is provided with an air receiving opening (21), the bottom of the piston (6) is provided with a spring seat (22) fixedly connected with the upper end of the valve rod (1), and the compression spring (7) is located between the spring seat (22) and the bottom wall of the support (3).

6. The pneumatic two-position stop valve with the overlength guiding valve rod according to claim 1, is characterized in that: an air receiving opening (21) is formed in the side face of the support (3), a spring seat (22) fixedly connected with the upper end of the valve rod (1) is arranged at the top of the piston (6), and the compression spring (7) is located between the spring seat (22) and the top wall of the air cylinder (4).