CN213511339U

CN213511339U - Single end face mechanical sealing device

Info

Publication number: CN213511339U
Application number: CN202022232829.8U
Authority: CN
Inventors: 王强; 黄纯洁
Original assignee: Zigong Keyu Sealing Technology Co ltd
Current assignee: Zigong Keyu Sealing Technology Co ltd
Priority date: 2020-10-09
Filing date: 2020-10-09
Publication date: 2021-06-22
Anticipated expiration: 2030-10-09

Abstract

The utility model discloses a single-end-face mechanical sealing device, which comprises a rubber static ring seat, a static ring, a movable ring, a transmission sleeve, a sealing box, a driving shaft and a fastening driving block, wherein a positioning gland is arranged outside the sealing box; the rubber static ring seat and the moving ring are respectively sleeved on the driving shaft in the sealing box, the static ring is embedded on the rubber static ring seat, the moving ring is abutted against the static ring, and the transmission sleeve is provided with a positioning structure for fixing the moving ring in the transmission sleeve; one side of the sealing box close to the positioning gland is provided with a cooling water sealing ring, and the inner ring of the cooling water sealing ring is attached to the driving shaft, so that a cooling water flowing cavity is formed among the movable ring, the static ring, the sealing box, the cooling water sealing ring and the driving shaft.

Description

Single end face mechanical sealing device

Technical Field

The utility model relates to a mechanical seal technical field, concretely relates to single-end face mechanical seal device.

Background

Shaft seals of centrifugal pumps are diverse: the machine seal has double end faces, single end faces, integrated type machine seal and bulk type machine seal. On the anticorrosion centrifugal pump, only a bulk machine seal can be generally used. Because the container type mechanical seal can only be made of stainless steel materials, and the stainless steel is not resistant to the corrosion of chloride ions and fluoride ions. At present, a container type machine seal made of a non-metallic anticorrosive material is not available, particularly in the cobalt and nickel hydrometallurgy industry with high corrosion resistance requirements, the conveying medium has high corrosivity, solid slurry is carried, the working condition is very harsh, and the lip-shaped rubber ring power seal can be mainly used at present.

SUMMERY OF THE UTILITY MODEL

Based on this, to the above-mentioned problem, it is necessary to provide a single-end mechanical sealing device which has corrosion resistance, good sealing performance, and convenient installation, and can prevent the rubber corrugated pipe from being twisted off and ensure the sealing effectiveness.

The technical scheme of the utility model as follows:

a single-end-face mechanical sealing device comprises a driving shaft and a sealing box sleeved on the driving shaft, wherein a rubber static ring seat, a static ring, a moving ring and a transmission sleeve which are sleeved on the driving shaft are arranged in the sealing box, the rubber static ring seat is positioned at one end in the sealing box, the static ring is embedded in the inner side of the rubber static ring seat, one side of the moving ring is abutted against one side of the static ring, one end of the transmission sleeve is arranged on the outer ring of the moving ring, a cooling water sealing ring is arranged at one end, far away from the rubber static ring seat, of the inner side of the sealing box, the inner ring of the cooling water sealing ring is attached to the driving shaft, and a cooling water flowing cavity is formed in the sealing box by gaps among the moving ring, the static ring, the cooling water sealing ring and the driving shaft; and a baffle ring is arranged between the static ring and the cooling water sealing ring, the baffle ring divides the cooling water flowing cavity into a high-pressure region and a low-pressure region, the static ring is positioned in the high-pressure region, and the cooling water sealing ring is positioned in the low-pressure region.

In the technical scheme, the sealing box and the driving shaft are limited and fixed through the positioning gland, and the installation mode does not need to use all stainless steel materials for fixed connection and does not need to use bulk sealing; some parts are movably connected by other non-metal materials to realize container type mechanical seal; meanwhile, a cooling water path is formed in the sealing box and is divided into a low-pressure area and a high-pressure area, the water level of the high-pressure area is kept at a high level by the aid of the baffle ring, the function of fully cooling the movable and static rings is achieved, the utilization rate of cooling water is improved, the pressure of the cooling water sealing ring is reduced, the service life of the cooling water sealing ring is prolonged, and meanwhile, the cooling water outlet is located in the low-pressure area, so that the sealing effect and the service life of the cooling water sealing ring are further guaranteed.

In a further technical scheme, the device also comprises a rubber corrugated pipe, a tight ring and a spring, wherein one end of the rubber corrugated pipe is tightly attached to the movable ring, the other end of the rubber corrugated pipe is tightly attached to the inner side of the transmission sleeve, the tight ring is sleeved on the outer side of the other end of the rubber corrugated pipe, the end of the rubber corrugated pipe is provided with a trepan boring matched with the driving shaft, the middle part of the rubber corrugated pipe is provided with a convex expansion compensation section, a plurality of inner lugs and a plurality of outer lugs which extend along the axial direction of the transmission sleeve are arranged on one end of the transmission sleeve far away from the movable ring at intervals, the inner convex pieces are positioned on the first circumference, the outer convex pieces are positioned on the second circumference, positioning grooves matched with the inner convex pieces are arranged at intervals along the circumferential direction at one end of the tight ring, and one end of the spring is sleeved on the outer convex pieces and abuts against the transmission sleeve.

In a further technical scheme, the centers of the first circumference and the second circumference are both positioned on the central axis of the transmission sleeve, and the diameter of the second circumference is larger than that of the first circumference.

In a further technical scheme, the device further comprises a positioning structure, wherein the positioning structure comprises a positioning notch, a pressure foot and a positioning protrusion matched with the positioning notch, the positioning notch is arranged on the outer periphery of the rotating ring, and the pressure foot and the positioning protrusion are both arranged on the transmission sleeve; the positioning notch and the positioning bulge are matched to circumferentially position the movable ring, and the pressure foot is pressed on the movable ring to limit the movable ring in the transmission sleeve.

In a further technical scheme, a fastening driving block is fixedly arranged on the driving shaft, a straight key groove is formed between the fastening driving block and the driving shaft, and an anti-rotation pin is embedded in the straight key groove.

The utility model has the advantages that:

1. the utility model discloses have corrosion resisting property, the leakproofness is good, simple to operate, can avoid rubber bellows to be twisted off, guarantees sealed validity.

2. The cooling water path is formed in the sealing box and is divided into the low-pressure area and the high-pressure area, the water level of the high-pressure area is kept at a high level by the aid of the baffle ring, the function of fully cooling the movable and static rings is achieved, the utilization rate of cooling water is improved, the pressure of the cooling water sealing ring is reduced, the service life of the cooling water sealing ring is prolonged, meanwhile, the cooling water outlet is located in the low-pressure area, and the sealing effect and the service life of the cooling water sealing ring are further guaranteed.

3. The utility model discloses to rubber bellows's mounting means, make the drive shaft rotate the in-process and drive through tight circle the synchronous rotation of transmission cover and rotating ring can avoid rubber bellows to be twisted off like this, guarantees sealed validity.

4. The positioning structure comprises a positioning notch, a pressure foot and a positioning bulge, the positioning notch and the positioning bulge are matched with each other to circumferentially position the movable ring, the pressure foot is pressed on the movable ring to limit the movable ring in the transmission sleeve, the movable ring is limited in the transmission sleeve through the positioning structure, slipping between the movable ring and the transmission sleeve is avoided, and the sealing effect is guaranteed.

5. The anti-rotation pin embedded in the straight key groove effectively plays an anti-rotation effect, and has the advantages of simple structure and simple and convenient use.

Drawings

Fig. 1 is a cross-sectional view of a single-ended mechanical seal according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a transmission sleeve according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of the drive sleeve of FIG. 2 from another angle;

FIG. 4 is a rear view of a drive sleeve according to an embodiment of the present invention;

fig. 5 is a front view of the rotating ring according to the embodiment of the present invention;

fig. 6 is a schematic structural view of the tight loop according to the embodiment of the present invention.

Description of reference numerals:

10. a stationary ring; 101. a rubber stationary ring seat; 20. a moving ring; 30. a transmission sleeve; 40. a sealing box; 401. positioning a gland; 402. cooling the water sealing ring; 403. a cooling water inlet; 404. a cooling water outlet; 50. a drive shaft; 501. fastening the driving block; 502. a straight key groove; 503. an anti-rotation pin; 601. positioning the notch; 602. a presser foot; 603. positioning the projection; 70. a rubber bellows; 701. tightening a ring; 702. a spring; 703. an inner tab; 704. an outer tab; 705. a first circumference; 706. a second circumference; 707. and (6) positioning a groove.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Examples

As shown in fig. 1, a single-end-face mechanical sealing device includes a rubber stationary ring seat 101, a stationary ring 10, a moving ring 20, a transmission sleeve 30, a sealing box 40 and a fastening driving block 501, which are sleeved on a driving shaft 50, wherein the fastening driving block 501 is fixedly arranged on the driving shaft 50, one end face of the fastening driving block 501 is closely attached to one end face of a positioning gland 401, the positioning gland 401 is disc-shaped, and the other end face of the positioning gland 401 is closely attached to one end face of the sealing box 40; the rubber static ring seat 101 and the moving ring 20 are respectively arranged in the sealing box 40, the axial cross section of the rubber static ring seat 101 is in an L shape, the static ring 10 is embedded in the inner side of the rubber static ring seat 101, one end face of the moving ring 20 is contacted with one end face of the static ring 10, one end of the transmission sleeve 30 is connected to the moving ring 20, the transmission sleeve 30 is sleeved on the outer side of the rubber corrugated pipe 70, the rubber corrugated pipe 70 is sleeved on the driving shaft 50 and is arranged in the sealing box 40, and the outer side of the other end of the transmission sleeve 30 is provided with a spring 702;

a cooling water sealing ring 402 is arranged on the inner side of one end, close to the positioning gland 401, of the sealing box 40, the cooling water sealing ring 402 is in contact with the driving shaft 50, a closed environment is formed in the sealing box 40, a cooling water flowing cavity is formed in the sealing box 40 through gaps among the movable ring 20, the static ring 10, the rubber corrugated pipe 70 and the driving shaft 50, a baffle ring is arranged between the static ring 10 and the cooling water sealing ring 402 and divides the cooling water flowing cavity into a high-pressure region and a low-pressure region, the static ring 10 is located in a high-pressure region, the cooling water sealing ring 402 is located in a low-pressure region, the baffle ring is fixedly connected with or integrally formed with the sealing box 40, and the bottom end of the baffle ring is close to the driving shaft; a cooling water inlet 403 is arranged between the static ring 10 and the retaining ring, and a cooling water outlet 404 is arranged between the retaining ring and the cooling water sealing ring 402.

In the embodiment, the sealing box 40 and the driving shaft 50 are limited and fixed through the positioning gland 401, and the installation mode does not need to use all stainless steel materials for fixed connection and does not need to use bulk sealing; some parts are movably connected by other non-metal materials to realize container type mechanical seal; meanwhile, a cooling water channel is formed in the sealing box 40 and is divided into a low-pressure area and a high-pressure area, the water level of the high-pressure area is kept at a high level due to the arrangement of the baffle ring, the function of fully cooling the movable and fixed rings 10 is achieved, the utilization rate of cooling water is improved, the pressure of the cooling water sealing ring 402 is reduced, the service life of the cooling water sealing ring 402 is prolonged, and meanwhile, the cooling water outlet 404 is located in the relative low-pressure area, so that the sealing effect and the service life of the cooling water sealing ring 402 are further guaranteed.

In another embodiment:

as shown in fig. 1-6, the single-ended mechanical seal further includes a rubber bellows 70, the front end of the rubber corrugated pipe 70 is tightly pressed in the transmission sleeve 30 through the movable ring 20, the tight ring 701 is sleeved on the outer peripheral wall of the rear end of the rubber corrugated pipe 70, the rear end of the rubber corrugated pipe 70 is provided with a sleeve hole matched with the driving shaft 50, the middle part of the rubber corrugated pipe 70 is provided with an inward bending telescopic compensation section, the rear end of the transmission sleeve 30 is provided with a plurality of inner convex sheets 703 and a plurality of outer convex sheets 704 at intervals around the rubber corrugated pipe 70, the inner convex sheets 703 and the outer convex sheets 704 both extend backwards along the axial direction of the transmission sleeve 30, the inner convex sheets 703 are positioned on a first circumference 705, the outer convex sheets 704 are positioned on a second circumference 706, the periphery of the front end of the tight ring 701 is provided with positioning grooves 707 which are equal to the number of the inner convex sheets 703 at intervals along the circumferential direction, the positioning grooves 707 are matched with the inner convex sheets 703 in a one-to-one correspondence, and one.

In this embodiment, the spring 702 applies an elastic acting force to the driving sleeve 30 to make the moving ring 20 and the stationary ring 10 tightly contact with each other, so as to prevent the spring 702 from scraping against the tight ring 701 and the rubber bellows 70, and the spring 702 applies an elastic acting force to the driving sleeve 30 to make the moving ring 20 and the stationary ring 10 tightly contact with each other to play a role in automatically compensating the seal abrasion of the moving ring 10 and the stationary ring 10, thereby ensuring the sealing performance between the moving ring 20 and the stationary ring 10; the movable ring 20 is positioned in the transmission sleeve 30 by a positioning structure, the front end of the rubber corrugated pipe 70 is pressed in the transmission sleeve 30 through the movable ring 20, the rear end of the rubber corrugated pipe 70 is in interference fit with the driving shaft 50 and is locked through the tightening ring 701, the positioning groove 707 on the tightening ring 701 is matched with the inner protruding piece 703 on the transmission sleeve 30 to transmit torque force without influencing the axial movement of the transmission sleeve 30, so that the transmission sleeve 30 and the movable ring 20 are driven to synchronously rotate through the tightening ring 701 in the rotating process of the driving shaft 50, the rubber corrugated pipe 70 can be prevented from being twisted off, and the sealing effectiveness is ensured.

In another embodiment:

as shown in fig. 2-4, the first circumference 705 and the second circumference 706 are both centered on the central axis of the drive sleeve 30, and the diameter of the second circumference 706 is greater than the diameter of the first circumference 705. An inner ring is formed, and fastening is realized while synchronous rotation is realized.

In another embodiment:

as shown in fig. 2-5, the device further includes a positioning structure, the positioning structure includes a positioning notch 601, a presser foot 602, and a positioning protrusion 603 matching with the positioning notch 601, the positioning notch 601 is disposed on the outer periphery of the rotating ring 20, and both the presser foot 602 and the positioning protrusion 603 are disposed on the driving sleeve 30. The positioning notch 601 is matched with the positioning protrusion 603 to circumferentially position the movable ring 20, the presser foot 602 is pressed on the movable ring 20 to limit the movable ring 20 in the transmission sleeve 30, the movable ring 20 is limited in the transmission sleeve 30 through the positioning structure, slipping between the movable ring 20 and the transmission sleeve 30 is avoided, and the sealing effect is ensured.

In another embodiment:

as shown in fig. 1, a fastening driving block 501 is fixedly disposed on the driving shaft 50, a straight key groove 502 is disposed between the fastening driving block 501 and the driving shaft 50, and an anti-rotation pin 503 is embedded in the straight key groove 502. The anti-rotation pin 503 embedded in the straight key groove 502 effectively plays the role of anti-rotation, and has simple structure and convenient use.

The above embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A single-end-face mechanical sealing device comprises a driving shaft and is characterized by further comprising a sealing box sleeved on the driving shaft, wherein a rubber static ring seat, a static ring, a dynamic ring and a transmission sleeve which are sleeved on the driving shaft are arranged in the sealing box, the rubber static ring seat is located at one end in the sealing box, the static ring is embedded in the inner side of the rubber static ring seat, one side of the dynamic ring abuts against one side of the static ring, one end of the transmission sleeve is arranged on the outer ring of the dynamic ring, a cooling water sealing ring is arranged at one end, far away from the rubber static ring seat, of the inner side of the sealing box, the inner ring of the cooling water sealing ring is attached to the driving shaft, and a cooling water flowing cavity is formed in the sealing box by gaps among the dynamic ring, the static ring, the cooling water sealing ring and the driving shaft; and a baffle ring is arranged between the static ring and the cooling water sealing ring, the baffle ring divides the cooling water flowing cavity into a high-pressure region and a low-pressure region, the static ring is positioned in the high-pressure region, and the cooling water sealing ring is positioned in the low-pressure region.

2. The single-ended mechanical seal device of claim 1, further comprising a rubber bellows, a tensioner, and a spring, one end of the rubber corrugated pipe is tightly attached to the movable ring, the other end of the rubber corrugated pipe is tightly attached to the inner side of the transmission sleeve, the tight ring is sleeved on the outer side of the other end of the rubber corrugated pipe, the end of the rubber corrugated pipe is provided with a trepan boring matched with the driving shaft, the middle part of the rubber corrugated pipe is provided with a convex expansion compensation section, a plurality of inner lugs and a plurality of outer lugs which extend along the axial direction of the transmission sleeve are arranged on one end of the transmission sleeve far away from the movable ring at intervals, the inner convex pieces are positioned on the first circumference, the outer convex pieces are positioned on the second circumference, positioning grooves matched with the inner convex pieces are arranged at intervals along the circumferential direction at one end of the tight ring, and one end of the spring is sleeved on the outer convex pieces and abuts against the transmission sleeve.

3. A single-ended mechanical seal according to claim 2, wherein said first circumference and said second circumference are both centred on the central axis of said drive sleeve, and the diameter of said second circumference is greater than the diameter of said first circumference.

4. The single-end-face mechanical sealing device according to claim 1 or 2, further comprising a positioning structure, wherein the positioning structure comprises a positioning notch, a pressure foot and a positioning protrusion matched with the positioning notch, the positioning notch is arranged on the outer periphery of the rotating ring, and the pressure foot and the positioning protrusion are both arranged on the transmission sleeve;

the positioning notch and the positioning bulge are matched to circumferentially position the movable ring, and the pressure foot is pressed on the movable ring to limit the movable ring in the transmission sleeve.

5. The single-end-face mechanical sealing device according to claim 1 or 2, wherein a fastening driving block is fixedly arranged on the driving shaft, a straight key groove is arranged between the fastening driving block and the driving shaft, and an anti-rotation pin is embedded in the straight key groove.

6. The single-ended mechanical seal device according to claim 1, wherein a cooling water inlet is provided between the stationary ring and the baffle ring, and a cooling water outlet is provided between the baffle ring and the cooling water sealing ring.