CN219432476U

CN219432476U - Fireproof PTFE filler sealing structure

Info

Publication number: CN219432476U
Application number: CN202320519174.3U
Authority: CN
Inventors: 许义兵; 尚海泉; 蒋连彪
Original assignee: Wuxi Smart Auto Control Engineering Co Ltd
Current assignee: Wuxi Smart Auto Control Engineering Co Ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-07-28
Anticipated expiration: 2033-03-17

Abstract

The utility model provides a fireproof PTFE packing sealing structure, which comprises a valve body, wherein a valve rod is rotatably arranged in the valve body, the upper end of the valve rod penetrates through the top end of the valve body and extends out of the valve body, a packing pressing plate is arranged at the upper end of the valve rod, butterfly springs are arranged on two sides of the upper end of the packing pressing plate, distance sleeves are arranged at the upper ends of the butterfly springs, the distance sleeves, the butterfly springs and the packing pressing plate are sequentially fixed at the top of the valve body through locking pieces, a spacer is arranged between the side wall of the upper end of the valve body and the valve rod, a packing pressing cover matched with the spacer is arranged between the upper end of the spacer and the lower end of the packing pressing plate, a packing assembly is arranged in a gap between the spacer and the valve body, and a bottom flange is arranged at the lower end of the valve body. The fireproof PTFE filler sealing structure adopts the fireproof PTFE filler structure, and the filler in contact with the medium is PTFE polytetrafluoroethylene, so that no pollution is generated to the medium under the non-fire working condition; the packing exposed in the environment atmosphere is graphite packing, and the external graphite packing can prevent the medium from leaking outwards, so that the use safety of the valve is ensured.

Description

Fireproof PTFE filler sealing structure

Technical Field

The utility model relates to the technical field of fluid control valves, in particular to a fireproof PTFE filler sealing structure.

Background

It is well known that the valve plays a role in opening, closing or adjusting a medium in a pipeline, and a non-metal material is arranged at the junction of a stuffing box, a bottom flange and a middle pipeline of the valve to serve as valve seal to prevent the valve from leaking. The valve sealing filler is usually graphite filler, polytetrafluoroethylene filler or rubber filler; for the general working condition, graphite filler is selected for the valve, so that the valve meets the fire-proof requirement while meeting the high temperature; for the working condition with the cleanliness requirement, the graphite filler can cause pollution to the medium, so polytetrafluoroethylene filler or rubber O-shaped ring can be selected as sealing, but the temperature of the polytetrafluoroethylene material is within the range of-73-200 ℃, and the polytetrafluoroethylene material is not suitable for the high-temperature and fireproof working condition.

In the operation process of the valve, if the valve encounters a fire, the medium leaks out due to high temperature, so that larger fire and explosion can be caused, and finally, great economic loss is caused. With the importance of the country on safety, especially in the chemical fluid industry, valves are required to have more and more fireproof capability; therefore, the utility model can meet the requirement of the medium on the cleanliness, and can realize the fireproof function, and the fireproof PTFE packing sealing structure can ensure the safe and long-term operation of the valve.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides a fireproof PTFE packing sealing structure which can meet the requirements of a medium on cleanliness, can realize a fireproof function, has long service life and can ensure that equipment and devices run safely and stably. The technical scheme adopted by the utility model is as follows:

a fire-resistant PTFE filler seal structure, wherein: the valve comprises a valve body, the valve rod rotates in the valve body, the valve rod upper end passes the valve body top and extends to outside the valve body, the valve rod upper end sets up the packing clamp plate, packing clamp plate upper end both sides all set up the belleville spring, the belleville spring upper end all sets up the distance cover, belleville spring and packing clamp plate loop through the retaining member to be fixed at the valve body top, set up the spacer between valve body upper end lateral wall and the valve rod, set up and spacer complex packing gland between spacer upper end and the packing clamp plate lower extreme, the space between spacer and the valve body sets up the packing subassembly, the valve body lower extreme sets up the end flange.

Preferably, the fire-resistant PTFE filler seal structure, wherein: the packing pressing plate and the packing gland are in spherical contact.

Preferably, the fire-resistant PTFE filler seal structure, wherein: the locking piece comprises a locking nut and a full-thread stud, and the locking nut is arranged on the full-thread stud.

Preferably, the fire-resistant PTFE filler seal structure, wherein: the packing assembly comprises a first graphite packing element and a tetrafluoro packing element, wherein the first graphite packing element is arranged in a gap between the spacer bush and the valve body, and the tetrafluoro packing element is arranged at the bottom of the spacer bush.

Preferably, the fire-resistant PTFE filler seal structure, wherein: and a second graphite packing element is arranged in a gap between the spacer bush and the packing gland.

Preferably, the fire-resistant PTFE filler seal structure, wherein: the lower bushing is arranged in the shaft hole at the lower end of the valve body, and the O-shaped ring is arranged between the valve body and the bottom flange.

Preferably, the fire-resistant PTFE filler seal structure, wherein: the bottom of the valve body is also provided with a metal winding gasket.

Preferably, the fire-resistant PTFE filler seal structure, wherein: and a limiting step is arranged at the upper end of the spacer bush.

The utility model has the advantages that:

(1) The fireproof PTFE filler sealing structure adopts the fireproof PTFE filler structure, and the filler in contact with the medium is PTFE polytetrafluoroethylene, so that no pollution is generated to the medium under the non-fire working condition; the packing that exposes in the ambient atmosphere is graphite packing, and when the conflagration took place, the PTFE packing group of liquid receiving position was burnt ashes, and outside graphite packing can prevent the medium from leaking outward when the conflagration took place, because the PTFE packing can prevent to leak outward under the normal temperature operating mode, PTFE packing can be burnt light when the conflagration took place, and the medium is upwards infiltration, and graphite packing just can exert the effect that prevents leaking outward this moment, prevents the medium and leaks outward, ensures valve safety in utilization.

(2) The fireproof PTFE filler sealing structure adopts a fireproof bottom flange sealing structure, and the sealing element contacting the medium is an O-shaped ring coated with PTFE material, so that no pollution is generated to the medium under the non-fire working condition; the sealing element exposed in the environment atmosphere is a graphite wound gasket, when a fire disaster occurs, the O-shaped ring at the liquid receiving part is burnt into ash, and the external graphite wound gasket can prevent the medium from leaking out, so that the use safety of the valve is ensured; the spacing sleeve is provided with a limiting step, and when the PTFE filler groups are burnt into ashes, the limiting step clamps the valve body, so that the two graphite filler groups are prevented from being excessively compressed, and the service life is prolonged;

(3) According to the fireproof PTFE packing sealing structure, the height design of the distance sleeve at the butterfly spring sets the maximum compression space of the butterfly spring, and excessive friction force caused by excessive compression in the mounting process of the butterfly spring is prevented.

Drawings

Fig. 1 is an assembly view of the structure of the present utility model.

Fig. 2 is an enlarged view of a portion of the packing fire protection structure of fig. 1.

Fig. 3 is an enlarged view of a portion of the bottom flange fire protection structure of fig. 1.

FIG. 4 is a schematic view of the spacer of the present utility model.

Detailed Description

The utility model will be further described with reference to the following specific drawings and examples.

Examples

As shown in fig. 1-4: this embodiment provides a fire prevention formula PTFE filler seal structure, including valve body 1, valve body 1 rotation sets up valve rod 2, valve rod 2 upper end passes valve body 1 top and extends to outside valve body 1, valve rod 2 upper end sets up packing clamp plate 7, packing clamp plate 7 upper end both sides all set up belleville spring 6, belleville spring 6 upper end all sets up distance sleeve 5, belleville spring 6 and packing clamp plate 7 loop through the retaining member and fix at valve body 1 top, set up spacer 9 between valve body 1 upper end lateral wall and valve rod 2, set up with spacer 9 complex packing gland 8 between spacer 9 upper end and the packing clamp plate 7 lower extreme, the space between spacer 9 and valve body 1 sets up the packing subassembly, valve body 1 lower extreme sets up bottom flange 16.

The valve rod 2 is arranged in the shaft hole of the valve body 1, and the cutting or the adjustment of the medium is realized by rotation; and a distance sleeve 5 for setting the maximum compression space of the belleville spring.

Wherein: the packing pressing plate 7 and the packing gland 8 are in spherical contact.

Wherein: the locking piece comprises a locking nut 3 and a full-thread stud 4, and the locking nut 3 is arranged on the full-thread stud 4.

Wherein: the packing assembly comprises a first graphite packing element 11 and a tetrafluoro packing element 12, wherein the first graphite packing element 11 is arranged in a gap between the spacer bush 9 and the valve body 1, and the tetrafluoro packing element 12 is arranged at the bottom of the spacer bush 9. The upper end of the spacer bush 9 is provided with a limit step, when a fire disaster occurs, the valve body 1 is clamped, excessive compression of filler is avoided, and the tetrafluoro filler piece 12 is arranged at the bottom of the spacer bush 9 and is in contact with a medium.

Wherein: a second graphite packing element 10 is arranged in the gap between the spacer bush 9 and the packing gland 8.

Wherein: a lower bushing 13 is arranged in a shaft hole at the lower end of the valve body 1, and an O-shaped ring 14 is arranged between the valve body 1 and a bottom flange 16.

Wherein: the bottom of the valve body 1 is also provided with a metal winding gasket 15. The O-shaped ring 14 is made of PTFE, has rubber elasticity inside and corrosion resistance of PTFE outside, and contacts with a medium to form a first seal; a metal winding gasket 15 is mounted on the step of the valve body 1 to form a planar seal with the bottom flange 16.

Wherein: the upper end of the spacer bush 9 is provided with a limit step 91.

The distance sleeve 5 is used for preventing the butterfly spring 6 from being excessively compressed, and is in a limit state when the lock nut 3 presses the distance sleeve 5 on the packing pressing plate 7, so that valve blocking caused by excessive pre-tightening force can be prevented; the packing pressing plate 7 is in spherical contact with the packing gland 8, so that the pretightening force generated by the belleville spring 6 can uniformly act on the first graphite packing element 11, the tetrafluoro packing element 12 and the second graphite packing element 10, and the service life of the valve is prevented from being reduced due to uneven friction; the spacer bush 9 is respectively provided with a matching tolerance with the valve body 1 and the packing gland 8, so that the installation precision of the upper fireproof bushing is ensured; the spacing sleeve 9 is further provided with a spacing step 91, and when fire PTFE filler burns out, the spacing step 91 clamps the valve body 1 to avoid excessively extruding the first graphite filler element 11 and the second graphite filler element 10 by the pretightening force of the belleville spring 6.

The height of the spacer bush 9 and the tight packing height are measured before installation, so that the packing compression amount is ensured to be 10% -18%, and the packing compression amount is in a reasonable state; the medium is sealed by the tetrafluoro packing element 12, so that the medium is not contacted with graphite packing under normal working conditions; the O-shaped ring 14 is contacted with the medium under normal working conditions to prevent the bottom metal from winding the gasket to pollute the medium, and meanwhile, the PTFE material coated outside the O-shaped ring can play a good role in corrosion resistance; the metal winding gasket 15 does not contact the medium under normal working conditions, and the O-shaped ring is burnt to play a sealing role when a fire disaster occurs; the bottom flange 16 is used for fixing the O-ring 14 and the metal winding gasket 15, and the groove depth between the bottom flange 16 and the valve body 1 can enable the graphite winding gasket 15 to be in a reasonable compression range.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same, and although the present utility model has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present utility model without departing from the spirit and scope of the technical solution of the present utility model, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present utility model.

Claims

1. The utility model provides a fire prevention formula PTFE filler seal structure which characterized in that: including valve body (1), valve body (1) rotation sets up valve rod (2), valve rod (2) upper end passes valve body (1) top and extends to outside valve body (1), valve rod (2) upper end sets up packing clamp plate (7), packing clamp plate (7) upper end both sides all set up belleville spring (6), belleville spring (6) upper end all sets up spacer sleeve (5), belleville spring (6) and packing clamp plate (7) pass through the retaining member in proper order and fix at valve body (1) top, set up spacer sleeve (9) between valve body (1) upper end lateral wall and valve rod (2), set up between spacer sleeve (9) upper end and packing clamp plate (7) lower extreme and spacer sleeve (9) complex packing gland (8), the space between spacer sleeve (9) and valve body (1) sets up the packing subassembly, valve body (1) lower extreme sets up end flange (16).

2. The fire resistant PTFE filler seal arrangement of claim 1, wherein: the packing pressing plate (7) and the packing gland (8) are in spherical contact.

3. The fire resistant PTFE filler seal arrangement of claim 1, wherein: the packing assembly comprises a first graphite packing element (11) and a tetrafluoro packing element (12), wherein the first graphite packing element (11) is arranged in a gap between the spacer bush (9) and the valve body (1), and the tetrafluoro packing element (12) is arranged at the bottom of the spacer bush (9).

4. The fire resistant PTFE filler seal arrangement of claim 1, wherein: and a second graphite packing element (10) is arranged in a gap between the spacer bush (9) and the packing gland (8).

5. The fire resistant PTFE filler seal arrangement of claim 1, wherein: a lower bushing (13) is arranged in a shaft hole at the lower end of the valve body (1), and an O-shaped ring (14) is arranged between the valve body (1) and the bottom flange (16).

6. The fire resistant PTFE filler seal of claim 5, wherein: the bottom of the valve body (1) is also provided with a metal winding gasket (15).

7. The fire resistant PTFE filler seal arrangement of claim 1, wherein: and a limiting step (91) is arranged at the upper end of the spacer bush (9).