CN210050096U

CN210050096U - External double-end-face corrosion-resistant mechanical seal

Info

Publication number: CN210050096U
Application number: CN201920656622.8U
Authority: CN
Inventors: 孙岩; 孙建华
Original assignee: ZIBO HUASHUN CORROSION PREVENTION VACUUM PUMP CO Ltd
Current assignee: ZIBO HUASHUN CORROSION PREVENTION VACUUM PUMP CO Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-02-11
Anticipated expiration: 2029-05-09

Abstract

The utility model relates to an adorn corrosion-resistant mechanical seal of bi-polar face outward belongs to vacuum pump accessory technical field. The utility model provides a sealing member is leaked after corroding easily when the extraction has corrosive liquids and gas problem that current vacuum pump exists. The utility model comprises a front static ring, a front dynamic ring, a compression sealing device, a rear dynamic ring and a rear static ring, wherein the inner side of the front dynamic ring is provided with an o-shaped ring; the compressing and sealing device is sleeved between the front rotating ring and the rear rotating ring and provides axial pressing force for the front rotating ring and the rear rotating ring.

Description

External double-end-face corrosion-resistant mechanical seal

Technical Field

The utility model relates to an adorn corrosion-resistant mechanical seal of bi-polar face outward belongs to vacuum pump accessory technical field.

Background

The mechanical seal is a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to the rotation axis, and the end faces are kept in fit and relatively slide under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal. The mechanical seal is a shaft seal device of a rotating machine. Since the drive shaft extends through the inside and outside of the apparatus, there is a circumferential gap between the shaft and the apparatus through which the medium in the apparatus leaks out, and if the pressure in the apparatus is lower than atmospheric pressure, air leaks into the apparatus, so that a shaft seal device must be provided to prevent leakage. The shaft seal has many kinds, and the mechanical seal has the advantages of small leakage amount, long service life and the like, so the mechanical seal is the most important shaft sealing mode in the devices in the world. The mechanical seal is also called end face seal.

The existing vacuum pump mechanical seal mainly has the following defects:

(1) when the vacuum pump is used for pumping corrosive liquid or gas, a structure in contact with a pumped medium is required to have strong corrosion resistance, and a mechanical seal is also in direct contact with the pumped medium, so that the vacuum pump also needs to have good corrosion resistance to meet the requirement of the vacuum pump. Most of the existing mechanical seals have no corrosion resistance.

(2) The existing corrosion-resistant mechanical seal of the vacuum pump adopts a form of a single-end-face sealing element, and when the single-end-face mechanical seal is used, corrosive liquid or gas possibly seeps out from the front end of the mechanical seal, so that the external environment is damaged, and the sealing effect is not ideal.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the above-mentioned defect that current vacuum pump seal assembly exists, provided one kind and adorned the corrosion-resistant mechanical seal of bi-polar face outward, simple structure, reasonable in design adopt the sealed mode of bi-polar face, and the front and back both ends are all sealed through rotating ring and quiet ring, and sealed effect is better, and the material of sealing member all adopts corrosion-resistant material simultaneously, has improved mechanical seal's effect.

The utility model discloses an adopt following technical scheme to realize:

an externally-mounted double-end-face corrosion-resistant mechanical seal comprises a front static ring, a front dynamic ring, a compression sealing device, a rear dynamic ring and a rear static ring, wherein an o-shaped ring is arranged on the inner side of the front dynamic ring, and an o-shaped ring is arranged on the inner side of the rear dynamic ring; the compressing and sealing device is sleeved between the front rotating ring and the rear rotating ring and provides axial pressing force for the front rotating ring and the rear rotating ring, so that the front rotating ring and the rear rotating ring are compressed and sealed on the front static ring and the rear static ring to play a sealing role.

Preferably, the compression sealing device comprises a positioning ring sleeved outside the front rotating ring and the rear rotating ring, a boss is arranged inside the positioning ring, springs are arranged on two sides of the boss, one end of the front spring is supported on the front rotating ring, the other end of the front spring is supported on the boss inside the positioning ring, one end of the rear spring is supported on the rear rotating ring, and the other end of the rear spring is supported on the boss inside the positioning ring; the positioning ring is sleeved on the outer sides of the front movable ring and the rear movable ring and is in close contact with the outer sides of the front movable ring and the rear movable ring respectively.

Preferably, the compression sealing device comprises a positioning ring, a spring is sleeved in the positioning ring, one end of the spring is supported on the front movable ring, the other end of the spring is supported on the rear movable ring, the positioning ring is sleeved on the outer sides of the front movable ring and the rear movable ring, and the positioning ring is respectively in close contact with the outer sides of the front movable ring and the rear movable ring; the both sides of position circle all are provided with and keep off the platform. The baffle table can ensure that the front movable ring and the rear movable ring cannot be separated from the positioning ring, the spring provides pressing force for the front movable ring and the rear movable ring, and the front movable ring and the rear movable ring are respectively pressed on the front static ring and the rear static ring.

Preferably, the front rotating ring and the rear rotating ring are made of graphite; the front static ring and the rear static ring are made of silicon carbide; the locating ring is made of high-strength glass fiber reinforced plastic.

Preferably, the spring is a corrugated spring, a gasket is arranged between the springs of the front rotating ring, a gasket is also arranged between the front end of the rear rotating ring and the spring, and the inner diameter of the spring is larger than that of the front rotating ring and that of the rear rotating ring.

Preferably, the o-ring is made of polytetrafluoroethylene.

The utility model has the advantages that:

(1) the utility model discloses an adorn corrosion-resistant mechanical seal of bi-polar face outward, adopt the mode of bi-polar face mechanical seal, can compress tightly preceding rotating ring and back rotating ring respectively on preceding quiet ring and back quiet ring through compressing tightly sealing device to all realize sealing with the front end and the rear end of the device, during operation, the liquid or the gas in the vacuum pump can obtain better sealing;

(2) a adorn corrosion-resistant mechanical seal of bi-polar face outward, preceding rotating ring, back rotating ring, preceding quiet ring, back quiet ring and position circle adopt corrosion-resistant material, can prolong mechanical seal's life greatly.

Drawings

Fig. 1 is a cross-sectional view of a first embodiment of the present invention;

fig. 2 is a sectional view of a second embodiment of the present invention;

in the figure: 1. a front stationary ring; 2. a forward moving ring; 3. a gasket; 4. a spring; 5. positioning rings; 6. a rear rotating ring; 7. a posterior stationary ring; 8. An o-ring.

Detailed Description

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

Example one

As shown in fig. 1, the external double-end-face corrosion-resistant mechanical seal of the present invention comprises a front stationary ring 1, a front moving ring 2, a pressing sealing device, a rear moving ring 6 and a rear stationary ring 7, wherein an o-ring 8 is disposed inside the front moving ring 2, and an o-ring 8 is also disposed inside the rear moving ring 6; the compressing and sealing device is sleeved between the front moving ring 2 and the rear moving ring 6 and provides axial compressing force for the front moving ring 2 and the rear moving ring 6. The pressing sealing device comprises a positioning ring 5 sleeved outside a front moving ring 2 and a rear moving ring 6, a boss is arranged inside the positioning ring 5, springs 4 are arranged on two sides of the boss, one end of each spring 4 on the front side is supported on the front moving ring 2, the other end of each spring 4 on the front side is supported on a boss on the inner side of the positioning ring 5, one end of each spring 4 on the rear side is supported on the rear moving ring 6, and the other end of each spring 4 on the rear side is supported on a boss on the inner side of the positioning ring 5; the locating ring 5 is sleeved on the outer sides of the front movable ring 2 and the rear movable ring 6, and the locating ring 5 is respectively in close contact with the outer sides of the front movable ring 2 and the rear movable ring 6. The front rotating ring 2 and the rear rotating ring 6 are made of graphite materials; the front static ring 1 and the rear static ring 7 are made of silicon carbide; the locating ring 5 is made of high-strength glass fiber reinforced plastic. The spring 4 is a corrugated spring, a gasket 3 is arranged between the spring 4 of the front rotating ring 2, a gasket 3 is also arranged between the front end of the rear rotating ring 6 and the spring 4, and the inner diameter of the spring 4 is larger than that of the front rotating ring 2 and that of the rear rotating ring 6. The O-shaped ring 8 is made of polytetrafluoroethylene.

The utility model discloses a use as follows:

during the use, will preceding quiet ring 1 fix the one end at the seal face that the vacuum pump will seal the axle, back quiet ring 7 is fixed at the other end that will seal the axle the seal face, and compress tightly it, in operation, the vacuum pump pivot rotates, drive preceding rotating ring 2, back rotating ring 6 and compress tightly sealing device and rotate together, it is sealed with preceding quiet ring 1 to promote preceding rotating ring 2 through the spring that compresses tightly sealing device in, promote simultaneously the sealed of back rotating ring 6 and back quiet ring 7, the sealing action when realizing the pivot is rotatory, simultaneously can effectually prevent inside corrosive liquids or gas overflow the polluted environment.

Example two

As shown in fig. 2, the pressing and sealing device includes a positioning ring 5, a spring 4 is sleeved in the positioning ring 5, one end of the spring 4 is supported on the front moving ring 2, the other end is supported on the rear moving ring 6, the positioning ring 5 is sleeved outside the front moving ring 2 and the rear moving ring 6, and the positioning ring 5 is respectively in close contact with the outer sides of the front moving ring 2 and the rear moving ring 6; the two sides of the positioning ring 5 are provided with baffle tables. The rest is the same as the first embodiment.

The utility model discloses mainly apply to the place that the vacuum pump pivot carries out mechanical seal.

Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.

Claims

1. An externally-mounted double-end-face corrosion-resistant mechanical seal, characterized in that: the compression sealing device comprises a front static ring (1), a front movable ring (2), a compression sealing device, a rear movable ring (6) and a rear static ring (7), wherein an o-shaped ring (8) is arranged on the inner side of the front movable ring (2), and the o-shaped ring (8) is also arranged on the inner side of the rear movable ring (6);

the compressing and sealing device is sleeved between the front moving ring (2) and the rear moving ring (6), and the compressing and sealing device provides axial pressing force for the front moving ring (2) and the rear moving ring (6).

2. An externally-fitted, double-ended, corrosion-resistant mechanical seal according to claim 1, wherein: the compression sealing device comprises a positioning ring (5) sleeved on the outer sides of a front movable ring (2) and a rear movable ring (6), a boss is arranged on the inner side of the positioning ring (5), springs (4) are arranged on two sides of the boss, one end of each spring (4) on the front side is supported on the front movable ring (2), the other end of each spring (4) on the front side is supported on a boss on the inner side of the positioning ring (5), one end of each spring (4) on the rear side is supported on the rear movable ring (6), and the other end of each spring (4) on the rear side is supported on a boss on the inner side of the positioning;

the positioning ring (5) is sleeved on the outer sides of the front movable ring (2) and the rear movable ring (6), and the positioning ring (5) is in close contact with the outer sides of the front movable ring (2) and the rear movable ring (6) respectively.

3. An externally-fitted, double-ended, corrosion-resistant mechanical seal according to claim 1, wherein: the pressing sealing device comprises a positioning ring (5), a spring (4) is sleeved in the positioning ring (5), one end of the spring (4) is supported on the front movable ring (2), the other end of the spring (4) is supported on the rear movable ring (6), the positioning ring (5) is sleeved on the outer sides of the front movable ring (2) and the rear movable ring (6), and the positioning ring (5) is respectively in close contact with the outer sides of the front movable ring (2) and the rear movable ring (6);

the two sides of the positioning ring (5) are provided with baffle tables.

4. An externally fitted double end-face corrosion resistant mechanical seal according to claim 2 or 3, wherein: the front rotating ring (2) and the rear rotating ring (6) are made of graphite materials; the front static ring (1) and the rear static ring (7) are made of silicon carbide; the positioning ring (5) is made of high-strength glass fiber reinforced plastic.

5. An externally fitted double end-face corrosion resistant mechanical seal according to claim 2 or 3, wherein: the spring (4) is a corrugated spring, a gasket (3) is arranged between the front moving ring (2) and the spring (4), the gasket (3) is also arranged between the front end of the rear moving ring (6) and the spring (4), and the inner diameter of the spring (4) is larger than the inner diameters of the front moving ring (2) and the rear moving ring (6).

6. An externally-fitted, double-ended, corrosion-resistant mechanical seal according to claim 1, wherein: the o-shaped ring (8) is made of polytetrafluoroethylene.