CN112197005A

CN112197005A - Mechanical seal sliding diameter dynamic seal structure

Info

Publication number: CN112197005A
Application number: CN202011083762.4A
Authority: CN
Inventors: 李辉
Original assignee: Jiangmen Teamful Sealing Technology Co ltd
Current assignee: Jiangmen Teamful Sealing Technology Co ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-01-08

Abstract

The invention belongs to the technical field of mechanical sealing, and particularly relates to a dynamic sealing structure at the sliding diameter of mechanical sealing, which comprises a shaft sleeve, wherein one end of the shaft sleeve is sleeved with a static ring, one side of the static ring is provided with a static ring seat, a first sealing ring is arranged between the static ring and the static ring seat, the static ring is fixedly connected with the static ring seat, one side of the static ring, which is far away from the static ring seat, is provided with a rotating ring, and a second sealing ring is arranged between the rotating ring and the shaft sleeve. Leading to the problem of damage to the seal ring.

Description

Mechanical seal sliding diameter dynamic seal structure

Technical Field

The invention belongs to the technical field of mechanical sealing, and particularly relates to a dynamic sealing structure at the sliding diameter of a mechanical seal.

Background

The mechanical seal is a shaft seal device of a rotating machine; for example, in the equipments such as centrifugal pump, centrifuge, reaction kettle and compressor, because the transmission shaft penetrates inside and outside the equipment, there is a circumferential gap between the shaft and the equipment, the medium in the equipment leaks out through the gap, if the pressure in the equipment is lower than the atmospheric pressure, the air leaks into the equipment, therefore, a shaft sealing device for preventing the leakage is necessary.

In the prior art, each set of mechanical seal has friction loss while rotating and rubbing, so each set of mechanical seal also has a compensation ring and a non-compensation ring, the compensation ring of the mechanical seal is subjected to slip compensation through a slip diameter, the seal at the slip diameter of the mechanical seal is used as a leak point of the mechanical seal, and the mechanical seal is sealed by an O-shaped ring or a U-shaped ring or a wedge-shaped ring.

Disclosure of Invention

The invention aims to provide a dynamic sealing structure at a mechanical sealing sliding diameter position, which aims to solve the problem that the service life of a sealing layer is greatly shortened because the sealing layer cannot be adjusted along with the change of pressure and is always in a tight state in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a mechanical seal diameter department of sliding moves seal structure, includes the axle sleeve, the pot head of axle sleeve is equipped with the stationary ring, stationary ring seat is installed to one side of stationary ring, install first sealing washer between stationary ring and the stationary ring seat, stationary ring and stationary ring seat fixed connection, one side that stationary ring kept away from stationary ring seat is provided with rotatory ring, be provided with the second sealing washer between rotatory ring and the axle sleeve, be provided with buffer between stationary ring and the rotatory ring, one side that stationary ring was kept away from to rotatory ring is provided with the spring holder, spring holder and axle sleeve fixed connection, be provided with first spring between spring holder and the rotatory ring, the spring holder passes through first spring elastic connection with rotatory ring.

Preferably, the stationary ring and the rotating ring are provided with sliding grooves at opposite sides, two ends of the buffer device are respectively positioned in the sliding grooves of the stationary ring and the rotating ring, and the buffer device is connected with the sliding grooves in a sliding manner.

Preferably, the buffering device comprises two pressing blocks and two sliding blocks, the two sliding blocks are respectively located in sliding grooves in the stationary ring and the rotating ring, the sliding blocks are connected with the sliding grooves in a sliding mode, one ends of the two pressing blocks are respectively located inside the two sliding blocks, a third sealing ring is installed between the two pressing blocks, and the third sealing ring is fixedly connected with the pressing blocks.

Preferably, a second spring is arranged inside the sliding block, one end of the second spring is located at one end of the pressing block, and the pressing block is elastically connected with the sliding block through the second spring.

Preferably, one end of the stationary ring is provided with an anti-rotation pin, one end of the anti-rotation pin is located inside the stationary ring seat, and the anti-rotation pin is connected with the stationary ring seat in a clamping manner.

Preferably, the spring seat is provided with a fastening bolt, one end of the fastening bolt is located on the shaft sleeve, and the fastening bolt is screwed with the spring seat through threads.

Compared with the prior art, the invention has the beneficial effects that:

(1) the second spring is arranged between the sliding block and the pressing block, when the pressure in the machine is increased, the rotating ring is extruded towards the direction of the stationary ring, meanwhile, the pressing block slides towards the inside of the sliding block, under the action of the second spring, the buffer device can be fully combined with the stationary ring and the rotating ring, when the pressure is reduced, the buffer device can be unfolded, and the problem that the sealing ring is in a tight state for a long time to cause damage to the sealing ring is solved.

(2) The invention is provided with the buffer devices positioned in the static ring and the rotating ring, and the buffer devices slide in the sliding grooves to enable the rotating ring and the static ring to rotate and simultaneously prevent a medium from passing through the position where the static ring and the rotating ring are combined, thereby realizing the sealing effect on the medium.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of a buffering device according to the present invention;

FIG. 3 is a schematic view of the engagement of the chute with the stationary and rotating rings of the present invention;

in the figure: 1-stationary ring seat; 2-a buffer device; 3-anti-rotation pin; 4-a stationary ring; 5-a first sealing ring; 6-a second sealing ring; 7-a first spring; 8-fastening bolts; 9-spring seats; 10-shaft sleeve; 11-a rotating ring; 12-a third sealing ring; 13-briquetting; 14-a second spring; 15-a slide block; 16-chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a mechanical seal sliding diameter position dynamic seal structure comprises a shaft sleeve 10, one end of the shaft sleeve 10 is sleeved with a static ring 4, one side of the static ring 4 is provided with a static ring seat 1, a first seal ring 5 is arranged between the static ring 4 and the static ring seat 1, the static ring 4 is fixedly connected with the static ring seat 1, one side of the static ring 4, which is far away from the static ring seat 1, is provided with a rotating ring 11, a second seal ring 6 is arranged between the rotating ring 11 and the shaft sleeve 10, a buffer device 2 is arranged between the static ring 4 and the rotating ring 11, the buffer device 2 is made of wear-resistant materials, the size of a slide block 15 is smaller than the depth of a chute 16, when the mechanical load runs, the contact between the rotating ring 11 and the static ring 4 increases the sealing degree between the two, one side of the rotating ring 11, which is far away from the static ring 4, is provided with a spring seat 9, the spring seat 9 is fixedly, the spring seat 9 is elastically connected with the rotating ring 11 through the first spring 7, and the buffer device 2 slides in the chute 16 to enable the rotating ring 11 and the stationary ring 4 to rotate and simultaneously prevent the medium from passing through the position where the stationary ring 4 and the rotating ring 11 are combined, so that the sealing effect on the medium is realized.

Furthermore, the stationary ring 4 and the rotating ring 11 are provided with a sliding groove 16 at the opposite side, the two ends of the buffer device 2 are respectively located in the sliding grooves 16 of the stationary ring 4 and the rotating ring 11, and the buffer device 2 is connected with the sliding groove 16 in a sliding manner.

Specifically, the buffering device 2 includes two pressing blocks 13 and two sliding blocks 15, the two sliding blocks 15 are respectively located in the sliding grooves 16 on the stationary ring 4 and the rotating ring 11, the sliding blocks 15 are slidably connected with the sliding grooves 16, one ends of the two pressing blocks 13 are respectively located inside the two sliding blocks 15, a third sealing ring 12 is installed between the two pressing blocks 13, and the third sealing ring 12 is fixedly connected with the pressing blocks 13.

It is worth to say that, the inside of slider 15 is provided with second spring 14, the one end of second spring 14 is located the one end of briquetting 13, briquetting 13 passes through second spring 14 elastic connection with slider 15, when mechanical internal pressure increases, rotatory ring is to the extrusion of stationary ring direction, the briquetting is to the inside slip of slider simultaneously, under the effect of second spring 14, buffer 2 can fully combine between 4 and the rotatory ring 11 with stationary ring, when pressure diminishes, buffer 2 can expand, avoid the sealing washer to be in tight state for a long time, lead to the problem of sealing washer damage.

Furthermore, one end of the stationary ring 4 is provided with an anti-rotation pin 3, one end of the anti-rotation pin 3 is located inside the stationary ring seat 1, the anti-rotation pin 3 is connected with the stationary ring seat 1 in a clamping manner, and the stationary ring 4 is fixed on the stationary ring seat 1 through the anti-rotation pin 3 and cannot rotate together with the rotating ring 11.

Furthermore, a fastening bolt 8 is arranged on the spring seat 9, one end of the fastening bolt 8 is located on the shaft sleeve 10, and the fastening bolt 8 is screwed with the spring seat 9 through threads.

The working principle and the using process of the invention are as follows: when the invention is used, the stationary ring 4 is fixed on the stationary ring seat 1 through the anti-rotation pin 3, the first seal ring 5 is positioned between the stationary ring 4 and the stationary ring seat 1 to play a role of sealing, the stationary ring seat 1 is fixed with equipment, the spring seat 9 is fixed on the shaft sleeve 10 through the fastening bolt 8, the rotary ring 11 is elastically connected with the spring seat 9 through the first spring 7, the second seal ring 6 is positioned between the rotary ring 11 and the shaft sleeve 10 to play a role of isolating and sealing, the buffer device 2 is positioned inside the chute 16, when the machine is filled with media, the pressure inside the machine is increased, so that the third seal ring 12, the pressing block 13 and the sliding block 15 are tightly combined with the stationary ring 4 and the rotating ring 11 under the action of the second spring 14 by pressing the rotating ring 11 towards the stationary ring 4, when the pressure inside the machine decreases, the damping device 2 is unfolded, and the capacity of the damping device 2 to automatically adjust according to the pressure is realized.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a mechanical seal diameter department of sliding moves seal structure, includes axle sleeve (10), its characterized in that: one end of the shaft sleeve (10) is sleeved with a static ring (4), one side of the static ring (4) is provided with a static ring seat (1), a first sealing ring (5) is arranged between the static ring (4) and the static ring seat (1), the static ring (4) is fixedly connected with the static ring seat (1), one side of the static ring (4) far away from the static ring seat (1) is provided with a rotating ring (11), a second sealing ring (6) is arranged between the rotating ring (11) and the shaft sleeve (10), a buffer device (2) is arranged between the static ring (4) and the rotating ring (11), a spring seat (9) is arranged on one side of the rotating ring (11) far away from the static ring (4), the spring seat (9) is fixedly connected with the shaft sleeve (10), a first spring (7) is arranged between the spring seat (9) and the rotating ring (11), the spring seat (9) is elastically connected with the rotating ring (11) through a first spring (7).

2. A mechanical seal sliding diameter dynamic seal structure according to claim 1, wherein: the two ends of the buffer device (2) are respectively positioned in the sliding grooves (16) on the stationary ring (4) and the rotating ring (11), and the buffer device (2) is in sliding connection with the sliding grooves (16).

3. A mechanical seal sliding diameter dynamic seal structure according to claim 2, wherein: the buffer device (2) comprises two pressing blocks (13) and two sliding blocks (15), the two sliding blocks (15) are respectively located in sliding grooves (16) on the stationary ring (4) and the rotating ring (11), the sliding blocks (15) are in sliding connection with the sliding grooves (16), one ends of the two pressing blocks (13) are respectively located in the two sliding blocks (15), a third sealing ring (12) is installed between the two pressing blocks (13), and the third sealing ring (12) is fixedly connected with the pressing blocks (13).

4. A mechanical seal sliding diameter dynamic seal structure according to claim 3, wherein: the inside of slider (15) is provided with second spring (14), the one end of second spring (14) is located the one end of briquetting (13), briquetting (13) and slider (15) pass through second spring (14) elastic connection.

5. A mechanical seal sliding diameter dynamic seal structure according to claim 1, wherein: the anti-rotation lock is characterized in that an anti-rotation pin (3) is arranged at one end of the static ring (4), one end of the anti-rotation pin (3) is located inside the static ring seat (1), and the anti-rotation pin (3) is connected with the static ring seat (1) in a clamping mode.

6. A mechanical seal sliding diameter dynamic seal structure according to claim 1, wherein: the spring seat (9) is provided with a fastening bolt (8), one end of the fastening bolt (8) is located on the shaft sleeve (10), and the fastening bolt (8) is screwed with the spring seat (9) through threads.