CN210178929U

CN210178929U - PTFE bellows integrated into one piece mechanical seal

Info

Publication number: CN210178929U
Application number: CN201921120212.8U
Authority: CN
Inventors: Ding Li; 李定; Xin Liu; 刘鑫; Guanghui Liu; 刘广辉; Yongzhi Liu; 刘永志; Yuelin Zhang; 张岳林
Original assignee: Suzhou Ke Ai Mike Low Temperature Equipment Technology Co Ltd
Current assignee: Suzhou Ke Ai Mike Low Temperature Equipment Technology Co Ltd
Priority date: 2019-07-17
Filing date: 2019-07-17
Publication date: 2020-03-24
Anticipated expiration: 2029-07-17

Abstract

The utility model discloses a PTFE bellows integrated into one piece mechanical seal, including rotating ring seat, rotating ring, quiet ring sum quiet ring seat, the rotating ring seat overlaps in waiting to seal the pivot of equipment, quiet ring seat installation the quiet ring, the rotating ring seat installation the rotating ring, the rotating ring with the terminal surface formation end face seal that quiet ring contacted; at least one of the static ring and the dynamic ring comprises a PTFE bellows; at least one of the static ring seat and the movable ring seat is provided with a limiting bulge, and the limiting bulge is provided with at least one position. The utility model adopts PTFE bellows to replace the original metal bellows, avoids the danger of weld fracture, and is suitable for low temperature environment; and the static ring seat/the movable ring seat is provided with a limiting bulge, so that overlarge radial deformation of the PTFE corrugated pipe is avoided, and the PTFE corrugated pipe is ensured to have displacement only in the axial direction.

Description

PTFE bellows integrated into one piece mechanical seal

Technical Field

The utility model belongs to the technical field of mechanical seal, especially, relate to a PTFE (polytetrafluoroethylene) bellows integrated into one piece mechanical seal, mainly used among the rotating machinery, like various pumps, compressor and reactor etc..

Background

The mechanical seal is widely applied to the fields of petroleum, chemical industry, machinery and aerospace. The sealing device is mainly used for rotary machinery, the sealing function is to prevent the leakage of sealed media, and simultaneously prevent external pollutants and impurities from entering the equipment cavity, so that the media in the equipment cavity are polluted.

A currently common mechanical seal structure is shown in fig. 1, and mainly includes a moving (static) ring seat a1, a moving (static) ring a2, a static (dynamic) ring A3, a static (dynamic) ring seat a4, and a compensation element a5, which rotate together with a shaft.

The mechanism of mechanical sealing is as follows: the movable ring and the movable ring seat are tightly matched and rotate along with a shaft, the stationary ring and the stationary ring seat are stationary parts, at the initial stage of sealing operation, the movable ring and the stationary ring are attached, a micron-sized liquid film is arranged in the middle of the movable ring and the stationary ring, the liquid film is a layer of fluid film formed by outward leakage of a medium in the cavity, when the closing force (including the spring force of a compensation element and the pressure of the medium in the cavity on the sealing ring) between the two sealing rings (the movable ring and the stationary ring) is equal to the opening force (including the contact force of the sealing ring and the medium pressure of the fluid film) of the sealing ring, the liquid film is stable, the sealing reaches the stress balance, the sealing can also stably operate, the sealing fluid film exists stably at the moment, the medium cannot leak outwards, and.

However, most of the existing mechanical seals also have many problems, most of the seals are widely made of springs or other devices with elastic compensation force such as corrugated pipes, especially in the low-temperature field, metal corrugated pipes are widely used, the processing and manufacturing processes of the metal corrugated pipes are complex, and the metal corrugated pipes need to be welded by metal wave plates with elasticity to form an integral corrugated pipe, but the welding also has certain risks, especially in the low-temperature environment, metal welding seams are easy to crack, so that the leakage of sealing media is easy to occur, and the service life of the metal corrugated pipes cannot meet the requirements of customers.

SUMMERY OF THE UTILITY MODEL

The utility model mainly solves the technical problem of providing an integrated mechanical seal of PTFE corrugated pipe, which adopts PTFE corrugated pipe to replace the original metal corrugated pipe, avoids the danger of weld joint fracture and is suitable for low temperature environment; and the static ring seat/the movable ring seat is provided with a limiting bulge, so that overlarge radial deformation of the PTFE corrugated pipe is avoided, and the PTFE corrugated pipe is ensured to have displacement only in the axial direction.

In order to solve the technical problem, the utility model discloses a technical scheme be: a PTFE corrugated pipe integrated mechanical seal comprises a movable ring seat, a movable ring, a static ring and a static ring seat, wherein the movable ring seat is sleeved on a rotating shaft of equipment to be sealed, the static ring seat is provided with the static ring, the movable ring seat is provided with the movable ring, and the end surface of the movable ring, which is in contact with the static ring, forms end surface seal;

at least one of the static ring and the dynamic ring comprises a PTFE bellows;

at least one of the static ring seat and the movable ring seat is provided with a limiting bulge, and the limiting bulge is provided with at least one position.

The utility model discloses a solve the further technical scheme that its technical problem adopted and be:

further, the inner diameter of the static ring seat is provided with the limiting protrusion and/or the outer diameter of the static ring seat is provided with the limiting protrusion.

Further, the inner diameter of the movable ring seat is provided with the limiting protrusion and/or the outer diameter of the movable ring seat is provided with the limiting protrusion.

Further, the PTFE bellows is integrally formed with the stationary ring.

Further, the PTFE bellows is integrally formed with the rotating ring.

Furthermore, the limiting protrusion is parallel to the length direction of the rotating shaft.

Furthermore, the static ring or the static ring seat is connected in an integrated manner or in a split manner.

Furthermore, the movable ring or the movable ring seat is connected in an integrated manner or in a split manner.

Furthermore, the movable ring seat is in interference fit with the rotating shaft.

The beneficial effects of the utility model are that following several points have at least:

1. the PTFE corrugated pipe and the static ring/dynamic ring are integrally formed, so that the risk of the fracture of the welding line of the corrugated pipe at low temperature can be avoided;

2. the inner diameter of the static ring seat/the movable ring seat extends to form a bulge, when the PTFE corrugated pipe is compressed, the limiting effect can be achieved, the overlarge radial deformation of the PTFE corrugated pipe is prevented, and safety accidents are avoided;

3. the outer diameter of the static ring seat/the movable ring seat is also extended with a bulge, so that the PTFE corrugated pipe is effectively ensured to move only in the axial direction, and the compensation force of the static ring/the movable ring in the axial direction is better provided.

Drawings

FIG. 1 is a schematic structural view of a prior art mechanical seal;

fig. 2 is a schematic structural diagram of embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of embodiment 2 of the present invention;

fig. 4 is a schematic structural diagram of embodiment 3 of the present invention;

fig. 5 is a schematic structural diagram of embodiment 4 of the present invention;

the parts in the drawings are marked as follows:

the movable ring seat comprises a movable ring seat 1, a movable ring 2, a static ring 3, a static ring seat 4, an inner diameter bulge 5, an outer diameter bulge 6, a PTFE corrugated pipe 7 and a metal corrugated pipe 8.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Example 1: an integrally formed mechanical seal for a PTFE corrugated pipe is shown in figure 2 and comprises a movable ring seat 1, a movable ring 2, a static ring 3 and a static ring seat 4, wherein the movable ring seat 1 is sleeved on a rotating shaft of equipment to be sealed, the static ring seat 4 is provided with the static ring 3, the movable ring seat 1 is provided with the movable ring 2, and the end face of the movable ring 2, which is contacted with the static ring 3, forms end face seal;

at least one of the static ring 3 and the dynamic ring 2 comprises a PTFE bellows 7;

at least one of the static ring seat 4 and the movable ring seat 1 is provided with a limiting bulge, and the limiting bulge is provided with at least one position.

The limiting protrusion is parallel to the length direction of the rotating shaft.

The static ring or the static ring seat is connected in an integrated manner or in a split manner.

The movable ring or the movable ring seat is connected in an integrated manner or in a split manner.

The movable ring seat is in interference fit with the rotating shaft.

In the embodiment, the movable ring seat and the movable ring are in interference fit, the static ring seat and the static ring are in tight fit, and the static ring and the PTFE corrugated pipe are integrally formed, so that the risk of the fracture of the welding line of the corrugated pipe at low temperature can be avoided; whole quiet ring adopts interference fit with quiet ring seat, and the internal diameter department of quiet ring seat has spacing arch (being the internal diameter is protruding 5), forms certain clearance with the PTFE bellows, when the compression of PTFE bellows, can play spacing effect, prevents the too big radial deformation of PTFE bellows, avoids the emergence of incident.

Example 2: the utility model provides a PTFE bellows integrated into one piece mechanical seal, as shown in figure 3, the difference with embodiment 1 lies in, be interference fit between rotating ring seat and the rotating ring, be interference fit between quiet ring seat and the quiet ring, quiet ring seat not only has spacing arch (being the internal diameter is protruding 5) in internal diameter department, also has spacing arch (being the external diameter is protruding 6) in external diameter department, effectively guarantees that the PTFE bellows only moves in axial direction to provide quiet ring/rotating ring at axial direction's compensatory power better.

Example 3: the utility model provides a PTFE bellows integrated into one piece mechanical seal, as shown in figure 4, with embodiment 1's difference lies in, be tight fit between rotating ring seat and the rotating ring, be tight fit between quiet ring seat and the quiet ring, quiet ring and PTFE bellows integrated into one piece, the rotating ring also with PTFE bellows integrated into one piece, can avoid the PTFE bellows to compare in the not enough phenomenon of metal bellows elasticity.

Example 4: the utility model provides a PTFE bellows integrated into one piece mechanical seal, as shown in figure 5, with embodiment 1's difference lie in, be interference fit between rotating ring seat and the rotating ring, be tight fit between quiet ring seat and the quiet ring, rotating ring and PTFE bellows integrated into one piece, quiet ring side adopts traditional corrugated metal pipe structure, so not only can reduce the cracked risk of bellows low temperature, can increase holistic elasticity simultaneously, PTFE bellows and corrugated metal pipe can play a role simultaneously, keep better sealed effect.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the same principle as the present invention.

Claims

1. A PTFE bellows integrated into one piece mechanical seal which characterized in that: the sealing device comprises a movable ring seat, a movable ring, a static ring and a static ring seat, wherein the movable ring seat is sleeved on a rotating shaft of equipment to be sealed, the static ring seat is provided with the static ring, the movable ring seat is provided with the movable ring, and the end surface of the movable ring, which is contacted with the static ring, forms end surface sealing;

at least one of the static ring and the dynamic ring comprises a PTFE bellows;

2. The PTFE bellows integrated mechanical seal of claim 1, wherein: the inner diameter of the static ring seat is provided with the limiting protrusion and/or the outer diameter of the static ring seat is provided with the limiting protrusion.

3. The PTFE bellows integrated mechanical seal of claim 1, wherein: the inner diameter of the movable ring seat is provided with the limiting protrusion and/or the outer diameter of the movable ring seat is provided with the limiting protrusion.

4. The PTFE bellows integrated mechanical seal of claim 1, wherein: the PTFE corrugated pipe and the static ring are integrally formed.

5. The PTFE bellows integrated mechanical seal of claim 1, wherein: the PTFE corrugated pipe and the movable ring are integrally formed.

6. The PTFE bellows integrated mechanical seal of claim 1, wherein: the limiting protrusion is parallel to the length direction of the rotating shaft.

7. The PTFE bellows integrated mechanical seal of claim 1, wherein: the static ring or the static ring seat is connected in an integrated manner or in a split manner.

8. The PTFE bellows integrated mechanical seal of claim 1, wherein: the movable ring or the movable ring seat is connected in an integrated manner or in a split manner.

9. The PTFE bellows integrated mechanical seal of claim 1, wherein: the movable ring seat is in interference fit with the rotating shaft.