CN219623252U

CN219623252U - Double-end-face mechanical sealing structure

Info

Publication number: CN219623252U
Application number: CN202322109995.2U
Authority: CN
Inventors: 张家犀; 李睿恩; 李稚蕊
Original assignee: Sichuan Huashan Fluid Industrial Technology Co ltd
Current assignee: Sichuan Huashan Fluid Industrial Technology Co ltd
Priority date: 2023-08-08
Filing date: 2023-08-08
Publication date: 2023-09-01
Anticipated expiration: 2033-08-08

Abstract

The utility model belongs to the technical field of mechanical sealing, and particularly discloses a double-end-face mechanical sealing structure which comprises a shaft sleeve, a movable ring, a shell, a stationary ring and an end cover, wherein the movable ring is positioned in the shell, the shell is connected with one side of the end cover, a sealing ring is arranged on the inner side of the shaft sleeve, a sealing strip is arranged between the end cover and the shell, the movable ring is connected with the shaft sleeve and can rotate along with the shaft sleeve, the stationary ring is connected inside the end cover, the end face of the movable ring is attached to the end face of the stationary ring, a moving block is axially and slidably matched with the shaft sleeve, an elastic piece is connected between the moving block and the movable ring, one end of the shell is in threaded connection with a gland, and one end of the gland can prop against the moving block and push the moving block to move. The utility model can improve the tightness of the mechanical sealing structure and reduce the occurrence of leakage.

Description

Double-end-face mechanical sealing structure

Technical Field

The utility model relates to the technical field of mechanical sealing, in particular to a double-end-face mechanical sealing structure.

Background

Currently, mechanical seal structures are one of the vital components in power machines and fluid machines. The stability and reliability of the mechanical seal structure may play an important role in the normal and stable operation of the device.

The mechanical seal is an axial end face sealing device which achieves sealing by means of the pretension of elastic elements to static and dynamic ring end face sealing pairs and the compression of medium pressure and elastic element pressure, and belongs to an end face sealing structure.

The sealing effect of the existing mechanical sealing structure is poor, and leakage at the sealing position can occur frequently.

Disclosure of Invention

The utility model provides a double-end-face mechanical sealing structure, and aims to improve the sealing performance of the mechanical sealing structure and reduce the occurrence of leakage.

The utility model is realized by the following technical scheme: the utility model provides a bi-polar face mechanical seal structure, includes axle sleeve, moving ring, shell, quiet ring and end cover, the moving ring is located the shell, the shell with one side interconnect of end cover, the inboard of axle sleeve is equipped with the sealing washer, the end cover with be equipped with the sealing strip between the shell, moving ring and axle sleeve connection just can rotate along with the axle sleeve, quiet ring connects inside the end cover, the terminal surface of moving ring with the terminal surface of quiet ring pastes mutually, along its axial sliding fit on the axle sleeve has the movable block, the movable block with be connected with the elastic component between the moving ring, the one end threaded connection of shell has the gland, the one end of gland can with the movable block offsets and promotes the movable block and remove.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

according to the utility model, the movable block is in sliding fit on the shaft sleeve, the end part of the shell is in threaded connection with the gland, so that the position of the movable block can be adjusted by rotating the gland, the extrusion force applied by the elastic piece on the movable block to the movable ring is adjusted, the extrusion degree of the movable ring and the stationary ring is adjusted, and under the action of the gland, the position of the movable block can be limited to a certain extent, so that the position state of the movable ring is more stable, the tightness between the movable ring and the stationary ring can be enhanced, the tightness of the whole mechanical sealing structure is effectively improved, and the occurrence of leakage is reduced.

Further, one end of the movable ring facing the stationary ring is connected with a sealing cover, the diameter of the sealing cover is larger than that of the end part of the stationary ring, one end of the sealing cover facing the stationary ring is provided with a sealing block, and the sealing cover abuts against one end of the stationary ring. The sealing cover and the sealing block in the scheme can further enhance the sealing performance between the movable ring and the static ring.

Further, a sealing ring is arranged between the sealing cover and the movable ring. The scheme can strengthen the tightness among the sealing cover, the movable ring and the shaft cover.

Further, the shaft sleeve is axially provided with a sliding groove, the bottom of the moving block is connected with a sliding block, and the sliding block is axially matched with the sliding groove in a sliding manner. The cooperation of spout and slider in this scheme can make the motion of movable block more steady, and can reduce the wearing and tearing of movable block, improves the life of movable block.

Further, the gland comprises an inner cylinder and an outer cylinder which are connected with each other, a gap is reserved between the inner cylinder and the outer cylinder, the outer shell is positioned between the inner cylinder and the outer cylinder, and the inner cylinder is in threaded connection fit with the inner side of the outer shell. The gland in this scheme includes inner tube and urceolus, forms double-deck sealed structure, can improve the leakproofness with between the shell under the effect of inner tube and urceolus like this.

Further, the inner side of the inner cylinder is connected with a telescopic unit, and two ends of the telescopic unit are respectively connected with the shaft sleeve and the inner cylinder. The flexible unit can avoid producing the clearance between inner tube and the axle sleeve tip in this scheme to improve the leakproofness. Simultaneously, the telescopic unit can generate compression or extension movement along with the rotation of the whole gland, so as to adapt to the axial movement of the gland.

Further, a sealing ring is further connected between the telescopic unit and the shaft sleeve. In this scheme, the sealing ring can improve the leakproofness between flexible unit and the axle sleeve.

Further, the telescopic unit is a corrugated pipe. The telescopic unit adopts the bellows in this scheme, and the bellows is light, and deformability is better.

Further, an oil filling hole is formed in the end cover, the oil filling hole is communicated with the cavity in the end cover, and the cavity in the end cover is communicated with the cavity in the shell. In this scheme, through oil filler point to the inside cavity injection lubricating oil of end cover, can play the lubrication effect, can also play the oil blanket effect, improve the leakproofness.

Further, a sealing sleeve is coaxially connected to the inner side of the stationary ring, and a sealing ring is also arranged between the stationary ring and the end cover. The sealing performance of the static ring can be improved in the scheme.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

FIG. 1 is a longitudinal cross-sectional view of an embodiment of a double-ended mechanical seal of the present utility model;

fig. 2 is a partial enlarged view at B in fig. 1.

In the drawings, the reference numerals and corresponding part names:

shaft 1, housing 2, end cap 3, gland 4, inner cylinder 401, outer cylinder 402, bellows 403, seal ring 404, threaded ring 4011, shaft sleeve 5, moving block 501, moving ring 502, seal cover 503, seal block 504, spring 505, slide slot 5011, slide block 5012, stationary ring 6, seal cartridge 601, oil filler hole 7, seal strip 8.

Description of the embodiments

For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.

As shown in fig. 1, this embodiment 1 provides a double-end-face mechanical seal structure, including a shaft sleeve 5, a movable ring 502, a housing 2, a stationary ring 6 and an end cover 3, the movable ring 502 is located in the housing 2, the housing 2 is connected with the left side of the end cover 3, the inner side of the shaft sleeve 5 is provided with an O-shaped sealing ring, sealing strips 8 are respectively arranged between the end cover 3 and the housing 2 to improve the sealing performance, and the shaft sleeve 5 is fixed on the shaft 1 and can rotate along with the rotation of the shaft 1.

The movable ring 502 is connected to the sleeve 5 and is rotatable with the sleeve 5, and the movable ring 502 is fixed to the sleeve 5 by being engaged with the sleeve. The stationary ring 6 is connected inside the end cover 3, and the stationary ring 6 can be fixed inside the end cover 3 in a clamping manner.

The end face of the moving ring 502 is attached to the end face of the stationary ring 6, and the moving ring 502 can rotate while the stationary ring 6 is stationary, thereby functioning as a mechanical seal. The shaft sleeve 5 is provided with a moving block 501 in a sliding fit along the axial direction, the moving block 501 in the embodiment is located at the left part of the shaft sleeve 5, a sliding groove 5011 is formed in the shaft sleeve 5 along the axial direction, the bottom of the moving block 501 is connected with a sliding block 5012, the sliding block 5012 is in sliding fit with the sliding groove 5011 in the axial direction, and an elastic piece is connected between the moving block 501 and the movable ring 502 and is a spring 505 in the embodiment.

In this embodiment, one end of the movable ring 502 facing the stationary ring 6 is connected with a sealing cover 503, the sealing cover 503 is connected with the shaft sleeve 5, the diameter of the sealing cover 503 is larger than that of the end of the stationary ring 6, one end of the sealing cover 503 facing the stationary ring 6 is provided with a sealing block 504, the sealing block 504 is embedded in the end face of the sealing cover 503, the sealing cover 503 abuts against one end of the stationary ring 6, the sealing block 504 is made of rubber material, the sealing performance between the sealing cover 503 and the stationary ring 6 can be improved, and an O-shaped sealing ring is arranged between the sealing cover 503 and the movable ring 502 in this embodiment.

The left end threaded connection of shell 2 has gland 4, and the one end of gland 4 can offset and promote the movable block 501 to remove with movable block 501, and specifically: in this embodiment, the pressing cover 4 includes an inner cylinder 401 and an outer cylinder 402 which are connected with each other, a gap is provided between the inner cylinder 401 and the outer cylinder 402, the housing 2 is located between the inner cylinder 401 and the outer cylinder 402, and the inner cylinder 401 is in threaded connection with the inner side of the housing 2, and in combination with fig. 2, an annular threaded ring 4011 is connected to the outer side of the inner cylinder 401 in this embodiment, and the inner cylinder 401 is in threaded connection with the inner side of the housing 2 through the threaded ring 4011. In this embodiment, a telescopic unit is connected to the inner side of the inner cylinder 401, and two ends of the telescopic unit are connected to the sleeve 5 and the inner cylinder 401 respectively.

Referring to fig. 2, in this embodiment, a sealing ring 404 is further connected between the expansion unit and the shaft sleeve 5, the expansion unit may be a bellows 403 or a spring, the expansion unit in this embodiment is a bellows 403, the inner side of the stationary ring 6 is coaxially connected with a sealing sleeve 601, an O-shaped sealing ring is also disposed between the stationary ring 6 and the end cover 3, and in this embodiment, the sealing sleeve 601, the sealing ring, the sealing strip 8, the sealing ring 404 and the sealing block 504 are all made of rubber materials.

In this embodiment, by rotating the gland 4, the gland 4 is in threaded fit with the housing 2, so as to generate axial displacement, and when the gland 4 moves axially, the end portion of the inner cylinder 401 of the gland 4 will push the moving block 501 to move rightward, so that the spring 505 is compressed, and the sealing cover 503 at the end portion of the moving ring 502 is tightly attached to the stationary ring 6, so that the tightness between the moving ring 502 and the stationary ring 6 is improved. And the inner cylinder 401 of the gland 4 in this embodiment will simultaneously move to the right causing the telescoping unit to be compressed to accommodate the axial movement of the gland 4.

In addition, in this embodiment, the arrangement of the sealing sleeve 601, the sealing ring, the sealing strip 8, the sealing ring 404 and the sealing block 504 can effectively improve the tightness of the whole sealing structure.

The seal structure in this embodiment can be applied to a single-end face mechanical seal structure and a double-end face mechanical seal structure.

Embodiment 2 differs from embodiment 1 in that in this embodiment, the inner side of the outer cylinder 402 of the gland 4 is provided with an internal thread, the outer side of the housing 2 is provided with an external thread, the outer cylinder 402 of the gland 4 is in threaded connection with the outer side of the housing 2, so that the inner cylinder 401 and the outer cylinder 402 of the gland 4 are respectively in threaded connection with the inner side and the outer side of the housing 2, and the tightness between the gland 4 and the housing 2 can be further improved.

Embodiment 3 is different from embodiment 1 in that in this embodiment, the inside of the end cover 3 and the casing 2 is hollow, and after the stationary ring 6 is installed inside the end cover 3, a space is still provided between the left part of the stationary ring 6 and the end cover 3, a gap is also provided between the sealing cover 503 of the moving ring 502 and the casing 2, and a cavity is also formed between the moving ring 502, the moving block 501 and the inner cylinder 401 and the casing 2, the oil filling hole 7 is formed on the end cover 3, the oil filling hole 7 is communicated with the cavity inside the end cover 3, and the cavity inside the end cover 3 is communicated with the cavity inside the casing 2, so that lubricating oil can be filled into the end cover 3 and the casing 2 through the oil filling hole 7, further the oil seal sealing function is achieved, and the sealing performance is improved.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims

1. The utility model provides a bi-polar face mechanical seal structure, includes axle sleeve, moving ring, shell, quiet ring and end cover, the moving ring is located the shell, the shell with one side interconnect of end cover, the inboard of axle sleeve is equipped with the sealing washer, the end cover with be equipped with the sealing strip between the shell, moving ring and axle sleeve connection just can rotate along with the axle sleeve, quiet ring connects inside the end cover, the terminal surface of moving ring with the terminal surface of quiet ring pastes mutually, its characterized in that, along its axial sliding fit on the axle sleeve has the movable block, the movable block with be connected with the elastic component between the moving ring, the one end threaded connection of shell has the gland, the one end of gland can with the movable block offsets and promotes the movable block to remove.

2. The double-end-face mechanical sealing structure according to claim 1, wherein one end of the movable ring facing the stationary ring is connected with a sealing cover, the diameter of the sealing cover is larger than that of the end part of the stationary ring, one end of the sealing cover facing the stationary ring is provided with a sealing block, and the sealing cover abuts against one end of the stationary ring.

3. The double-end-face mechanical seal structure according to claim 2, wherein a seal ring is arranged between the seal cover and the movable ring.

4. The double-end-face mechanical sealing structure according to claim 1, wherein the shaft sleeve is provided with a sliding groove along the axial direction of the shaft sleeve, the bottom of the moving block is connected with a sliding block, and the sliding block is in axial sliding fit with the sliding groove.

5. The double-end-face mechanical seal structure according to claim 1, wherein the gland comprises an inner cylinder and an outer cylinder which are connected with each other, a gap is formed between the inner cylinder and the outer cylinder, the outer cylinder is located between the inner cylinder and the outer cylinder, and the inner cylinder is in threaded connection fit with the inner side of the outer cylinder.

6. The double-end-face mechanical seal structure according to claim 5, wherein the inner side of the inner cylinder is connected with a telescopic unit, and two ends of the telescopic unit are respectively connected with the shaft sleeve and the inner cylinder.

7. The double-end-face mechanical seal structure according to claim 6, wherein a sealing ring is further connected between the telescopic unit and the shaft sleeve.

8. The double-ended mechanical seal according to claim 6 or 7, wherein the telescoping unit is a bellows.

9. The double-end-face mechanical seal structure according to claim 1, wherein the end cover is provided with an oil filling hole, the oil filling hole is communicated with a cavity inside the end cover, and the cavity inside the end cover is communicated with a cavity inside the shell.

10. The double-end-face mechanical sealing structure according to claim 1, wherein a sealing sleeve is coaxially connected to the inner side of the stationary ring, and a sealing ring is also arranged between the stationary ring and the end cover.