CN217003146U

CN217003146U - Poppet valve sealing structure

Info

Publication number: CN217003146U
Application number: CN202122986696.8U
Authority: CN
Inventors: 徐先宝; 何圣龙; 闫波; 张加龙; 马俊; 张明成; 陈长伟
Original assignee: Shaanxi Changqing Energy & Chemical Co ltd
Current assignee: Shaanxi Changqing Energy & Chemical Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-07-19
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses a poppet valve sealing structure which is characterized in that a plurality of layers of sealing rings (5) are fixedly arranged at the joint of an air cylinder (1) and a valve rod (2); the ball head connection (7) is arranged between the valve rod (2) and the base (4) and is connected through a through pin (3) arranged in the valve rod (2). The utility model solves the technical problems that the valve rod of the poppet valve of the bag-type dust collector of the prior power device deviates, the air cylinder leaks air, the valve rod is stuck and immovable, the sealing filler is aged and falls off, the sealing element is abraded and the like to influence the normal operation of the valve.

Description

Poppet valve sealing structure

Technical Field

The utility model relates to the technical field of maintenance and repair of pneumatic valves in industrial production processes, in particular to a poppet valve sealing structure, and particularly relates to a bag-type dust collector poppet valve structure.

Background

At present, in the normal maintenance of power instrument, the poppet valve action abnormal conditions is frequent, and maintenance cycle is shorter, leads to its reason, and it is complicated to mainly lie in the operating mode environment that the poppet valve is located, and the temperature is high, and the dust is big, leads to sealed damage or sealed not tight of poppet valve rod and executor junction, leads to valve rod and contact surface bite, and the condition that the valve rod splits even takes place.

The prior bag-type dust collector poppet valve of the power device of the applicant comprises a valve body, a valve rod (2), a base (4) and a valve plate (6), wherein the base (4) is connected to the lower end of the valve rod (2) through a nut (9), and the valve is in a high-temperature or poor-environment working condition, so that the valve rod (2) can be deviated after a period of time in the use process; or dust impurities enter the valve rod sealing part to cause air leakage of the cylinder (1); or the valve rod is stuck and does not move, the sealing element is abraded and other faults affect the normal operation of the valve; the valve plate does not act in place, so that a gap is left at the closed position to cause leakage, the sealing filler is aged and falls off to cause untight closing of the valve plate, the sealing effect is seriously reduced, and leakage pollution is caused; or the damage of the membrane head seal causes air leakage of the cylinder, the pollution of the cylinder after a long time, the increase of friction force, and slow movement or jamming.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a poppet valve sealing structure, which overcomes the defects of the prior art, reduces the maintenance amount and reduces the purchase cost.

The purpose of the utility model is realized by the following technical scheme:

a poppet valve sealing structure comprises an air cylinder, a valve rod connected with the air cylinder and a base connected to the lower end of the valve rod, wherein a plurality of layers of sealing rings are fixedly arranged at the joint of the air cylinder and the valve rod; the valve rod is a ball valve rod and is connected with the base through a ball head; the valve rod is connected with the base through a through pin arranged in the valve rod.

The sealing ring is a five-layer sealing ring; the polytetrafluoroethylene packing material comprises a first sealing ring layer, a second sealing ring layer, a fourth sealing ring layer and a fifth sealing ring layer which are polytetrafluoroethylene packing layers with hardness; the third layer of sealing ring is a rigid annular material sealing ring, and is used for ensuring the verticality of the valve rod and the cylinder and protecting the V-shaped seal from being injured.

The first layer of sealing ring and the second layer of sealing ring are upwards sealed in a V-shaped mode and are used for preventing gas in the sealing cylinder from leaking.

The V-shaped seal rings on the fourth layer and the fifth layer are sealed downwards, and the V-shaped seal rings are used for sealing dust and impurities outside the cylinder and preventing the dust and the impurities from running into the cylinder.

And a valve plate is fixedly connected below the base. The pin penetrating function is that the ball valve rod and the base are dynamically positioned, the valve rod and the base cannot move or deviate in the vertical direction, the ball head ensures that the valve rod and the base have a certain angle gap in the horizontal direction, and a certain angle is formed in the sealing process of the valve plate without affecting the verticality of the valve rod.

Through the technical scheme, the utility model has the following beneficial effects:

the technical problems that the valve rod of a lifting valve of a bag dust collector of the conventional power device deviates, an air cylinder leaks air, the valve rod is blocked and does not move, sealing filler is aged and drops, a sealing piece is abraded and the like to influence the normal operation of the valve are solved, the maintenance amount is reduced, the purchase cost is reduced, the shape and the sealing material of the conventional sealing structure are structurally changed, the service life is prolonged, the valve rod and the sealing material are ensured to be used for a long period, and the production cost and the maintenance cost are reduced.

Drawings

FIG. 1 is a schematic view of a prior art poppet valve before improvement

FIG. 2 is a schematic view of the structure of the present invention

FIG. 3 is a five-layer seal ring

Numbering in the figures: 1-cylinder, 2-valve rod, 3-pin, 4-base, 5-sealing ring, 501-first layer sealing ring, 502-second layer sealing ring, 503-third layer sealing ring, fourth layer sealing ring, 504-fourth layer sealing ring, 505-fifth layer sealing ring, 6-valve plate, 7-ball head connection, 9-nut

Detailed Description

As shown in fig. 2 and 3, the poppet valve sealing structure comprises a cylinder 1, a valve rod 2 and a valve plate 6, wherein five layers of sealing rings 5 are fixedly arranged at the joint of the cylinder 1 and the valve rod 2.

The first layer of sealing ring 501 and the second layer of sealing ring 502 are V-shaped sealing rings and are polytetrafluoroethylene packing layers with hardness, the V-shaped sealing rings face upwards and are used for sealing air in the air cylinder to prevent leakage; the third layer of sealing ring 503 is a rigid annular material sealing ring and has the function of ensuring the verticality of the valve rod and the cylinder and protecting the V-shaped seal from being injured; the fourth layer of sealing ring 504 and the fifth layer of sealing ring 505 are also made of a polytetrafluoroethylene packing layer with hardness, and the V-shaped sealing is downward, so that dust and impurities outside the cylinder are sealed, and the dust and the impurities are prevented from entering the cylinder.

In order to ensure the verticality of the valve rod 2, the valve rod 2 is connected with the base 4 through a ball head, and the valve rod is connected through a penetrating pin 6 arranged in the valve rod 2, so that the valve rod is prevented from being subjected to torsion.

And a base 4 is arranged between the valve rod 2 and the valve plate 6 and has a supporting function on the valve rod 2.

According to the utility model, after the working principle and the structural characteristics of the cylinder lifting valve are researched, the improved design is carried out on the factors influencing the sealing performance of the cylinder lifting valve at high temperature, mainly on the sealing material, the quantity and the shape of the sealing material, and the verticality of a valve plate and a valve rod; aiming at the existing problems, in order to reduce the maintenance amount and the purchase cost, the shape and the sealing material of the existing sealing structure are structurally changed, so that the service life is prolonged, the long-term use of the valve rod and the sealing is ensured, and the production cost and the maintenance cost are reduced.

Claims

1. A poppet valve sealing structure comprises an air cylinder (1), a valve rod (2) connected with the air cylinder (1) and a base (4) connected to the lower end of the valve rod (2), and is characterized in that a plurality of layers of sealing rings (5) are fixedly arranged at the joint of the air cylinder (1) and the valve rod (2); the valve rod (2) is a ball valve rod, and a ball joint (7) is arranged between the valve rod and the base (4); the valve rod (2) is connected with the base (4) through a through pin (3) arranged in the valve rod (2).

2. A poppet valve seal arrangement according to claim 1, characterised in that the seal ring (5) is a five-layer seal ring; the sealing device comprises a first sealing ring (501), a second sealing ring (502), a fourth sealing ring (504) and a fifth sealing ring (505), wherein the first sealing ring, the second sealing ring, the fourth sealing ring and the fifth sealing ring are PTFE packing layers with hardness; the third layer of sealing ring (503) is a rigid annular material sealing ring.

3. The poppet valve seal structure according to claim 1 or 2, wherein the first layer of seal ring (501) and the second layer of seal ring (502) are sealed in a V-shaped upward direction; the fourth layer of sealing ring (504) and the fifth layer of sealing ring (505) are sealed in a V-shaped downward mode.

4. Poppet valve seal according to claim 1 or 2, characterised in that a valve plate (6) is fixedly connected below the base (4).