CN216382579U

CN216382579U - Mechanical seal

Info

Publication number: CN216382579U
Application number: CN202123259359.5U
Authority: CN
Inventors: 房旭; 李增鹏
Original assignee: Zibo Qianrui Pump Co ltd
Current assignee: Zibo Qianrui Pump Co ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-04-26
Anticipated expiration: 2031-12-23

Abstract

The utility model relates to the technical field of mechanical seal, and particularly discloses a mechanical seal which comprises a spring seat, a movable ring, a plurality of springs, a push ring and a static ring assembly, wherein the spring seat is provided with a plurality of grooves; the spring seat is fixedly arranged on the shaft; a plurality of grooves are uniformly formed in one side surface of the spring seat along the circumferential direction; a spring is arranged in the groove; the whole movable ring is arranged in a cylinder with a through hole in the center of the bottom surface, and the diameter of the through hole is smaller than the inner diameter of the cylinder; the movable ring is sleeved outside the spring seat in a matching manner; the other end of the spring is abutted against the inner bottom surface of the movable ring; the outer side of the movable ring is abutted against the push ring; the push ring abuts against the stationary ring assembly. Compared with the prior art, the arrangement of a plurality of springs ensures uniform elasticity and is beneficial to high-speed rotation. The movable ring is sleeved outside the spring seat in a matching manner, so that the moving stability of the movable ring is ensured, the movable ring is prevented from shaking, the abrasion is reduced, and the sealing performance is improved.

Description

Mechanical seal

Technical Field

The utility model relates to the technical field of mechanical seal, and particularly discloses a mechanical seal.

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. Such as centrifugal pumps, centrifuges, reaction kettles, compressors, and the like. 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 existing single-spring mechanical seal commonly uses a spring as a transmission mechanism, and the common round wire spring is unstable in transmission and uneven in elasticity, so that the single-spring mechanical seal is not suitable for high-speed operation. And the mechanical seal with multiple springs is adopted, so that the sealing effect is poor.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a mechanical seal to solve the problems that the single-spring mechanical seal in the prior art has uneven elasticity and the multi-spring mechanical seal is poor in effect.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a mechanical seal comprises a spring seat, a movable ring, a plurality of springs, a push ring and a static ring assembly; the spring seat is fixedly arranged on the shaft; a plurality of grooves are uniformly formed in one side surface of the spring seat along the circumferential direction; a spring is arranged in the groove; the whole movable ring is arranged in a cylinder with a through hole in the center of the bottom surface, and the diameter of the through hole is smaller than the inner diameter of the cylinder; the movable ring is sleeved outside the spring seat in a matching manner; the other end of the spring is abutted against the inner bottom surface of the movable ring; the outer side of the movable ring is abutted against the push ring; the push ring abuts against the stationary ring assembly. The arrangement of a plurality of springs ensures uniform elasticity and is beneficial to high-speed rotation. The movable ring is sleeved outside the spring seat in a matching manner, so that the moving stability of the movable ring is ensured, the movable ring is prevented from shaking, the abrasion is reduced, and the sealing performance is improved. The arrangement of the push ring ensures the sealing of the movable ring and the static ring component.

Preferably, a plurality of strip holes are arranged on the outer side surface of the movable ring; a threaded cylindrical pin is arranged in the long hole; the other end of the threaded cylindrical pin is arranged on the spring seat in a threaded mode, and the swing of the movable ring is limited. The setting of screw thread cylindric lock has guaranteed the stability of being connected of rotating ring and spring holder.

Preferably, a first sealing ring is arranged on the contact surface of the moving ring and the spring seat, so that the moving ring is ensured to move, and meanwhile, the sealing performance is improved.

Preferably, the outer side of the bottom surface of the movable ring is provided with a convex edge; one side of the push ring is sleeved in a space formed by the movable ring and the convex edge. The shaking of the push ring is limited, the stability of the push ring is guaranteed, the conflict between the push ring and the static ring assembly is guaranteed, and the sealing effect is guaranteed.

Preferably, the stationary ring assembly comprises a stationary ring and a stationary ring cover; one side of the static ring is sleeved in the static ring cover; the static ring opposite side is abutted against the push ring, and the static ring cover is arranged, so that the stability of the static ring is ensured, and the installation is convenient and the fixation is realized.

Preferably, the spring seat is fixed on the shaft by a set screw; and a second sealing ring is arranged between the spring seat and the shaft. The setting screw makes things convenient for the epaxial installation of spring holder to be fixed. And the sealing ring II is arranged, so that the sealing between the spring seat and the shaft is ensured.

The utility model has the beneficial effects that: the arrangement of a plurality of springs ensures uniform elasticity and is beneficial to high-speed rotation. The movable ring is sleeved outside the spring seat in a matching manner, so that the moving stability of the movable ring is ensured, the movable ring is prevented from shaking, the abrasion is reduced, and the sealing performance is improved.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged schematic view at A in FIG. 1;

description of reference numerals:

1-a spring seat, 2-a movable ring, 3-a spring, 4-a push ring, 5-a shaft, 6-a threaded cylindrical pin, 7-a first sealing ring, 8-a stationary ring, 9-a stationary ring cover, 10-a set screw, 11-a second sealing ring, 12-a cylindrical pin, 13-a third sealing ring and 14-a shell;

101-a groove;

201-elongated hole, 202-convex edge.

Detailed Description

The present invention is further described below with reference to examples.

Example 1

As shown in fig. 1 and 2, the mechanical seal comprises a spring seat 1, a movable ring 2, six springs 3, a push ring 4 and a static ring assembly; the spring seat 1 is fixed on the shaft 5 through a set screw 10; a second sealing ring 11 is arranged between the spring seat 1 and the shaft 5; the setting screw 10 is arranged to facilitate the installation and fixation of the spring seat 1 on the shaft 5. And the second sealing ring 11 is arranged, so that the sealing between the spring seat 1 and the shaft 5 is ensured. Six grooves 101 are uniformly formed in one side surface of the spring seat 1 along the circumferential direction; a spring 3 is arranged in the groove 101; the whole movable ring 2 is arranged in a cylinder with a through hole in the center of the bottom surface, and the diameter of the through hole is smaller than the inner diameter of the cylinder; the movable ring 2 is sleeved outside the spring seat 1 in a matching way; the other end of the spring 3 is abutted against the inner bottom surface of the movable ring 2; the outer side of the movable ring 2 is abutted against the push ring 4; the push ring 4 abuts against the stationary ring assembly. The arrangement of the six springs 3 ensures uniform elasticity and is beneficial to high-speed rotation. The movable ring 2 is arranged outside the spring seat 1 in a matched manner, so that the movable ring 2 is guaranteed to move stably, the movable ring 2 is prevented from shaking, abrasion is reduced, and the sealing performance is improved. The arrangement of the push ring ensures the sealing of the movable ring 2 and the static ring component.

In the above arrangement, six elongated holes 201 are provided on the outer side surface of the movable ring 2; a threaded cylindrical pin 6 is arranged in the long hole 201; the other end of the threaded cylindrical pin 6 is arranged on the spring seat 1 in a threaded mode, and the swing of the movable ring 2 is limited. The arrangement of the threaded cylindrical pin 6 ensures the connection stability of the movable ring 2 and the spring seat 1. A first sealing ring 7 is arranged on the contact surface of the moving ring 2 and the spring seat 1, so that the moving ring 2 is guaranteed to move, and meanwhile, the sealing performance is improved. The outer side of the bottom surface of the movable ring 2 is provided with a convex edge 202; 4 side sleeves of push ring are established in the space that rotating ring 2 and chimb 202 are constituteed, have restricted rocking of push ring 4, have guaranteed the stability that push ring 4 set up, guarantee the conflict of push ring 4 and quiet ring subassembly, have guaranteed sealed effect.

The static ring assembly comprises a static ring 8 and a static ring cover 9; one side of the static ring 8 is sleeved in the static ring cover 9; the other side of the static ring 8 is abutted against the push ring 4. The static ring cover 9 ensures the stability of the static ring 8, and is convenient to install and fix. When the sealing device is used, the static ring cover 9 is fixed on the outer shell 14 or the end cover by the cylindrical pin 12, and the gap between the static ring cover 9 and the shell 14 or the end cover is sealed by the sealing ring III 13 to prevent leakage.

Claims

1. A mechanical seal is characterized by comprising a spring seat (1), a movable ring (2), a plurality of springs (3), a push ring (4) and a static ring assembly; the spring seat (1) is fixedly arranged on the shaft (5); a plurality of grooves (101) are uniformly formed in one side surface of the spring seat (1) along the circumferential direction; a spring (3) is arranged in the groove (101); the whole movable ring (2) is arranged in a cylinder with a through hole in the center of the bottom surface, and the diameter of the through hole is smaller than the inner diameter of the cylinder; the movable ring (2) is sleeved outside the spring seat (1) in a matching manner; the other end of the spring (3) is abutted against the inner bottom surface of the movable ring (2); the outer side of the movable ring (2) is abutted against the push ring (4); the push ring (4) is abutted against the static ring component; a plurality of strip holes (201) are arranged on the outer side surface of the movable ring (2); a threaded cylindrical pin (6) is arranged in the long hole (201); the other end of the threaded cylindrical pin (6) is arranged on the spring seat (1) in a threaded mode.

2. The mechanical seal according to claim 1, characterized in that a first seal ring (7) is arranged on the contact surface of the movable ring (2) and the spring seat (1).

3. The mechanical seal according to claim 1, characterized in that the outer side of the bottom surface of the rotating ring (2) is provided with a flange (202); one side of the push ring (4) is sleeved in a space formed by the movable ring (2) and the convex edge (202).

4. A mechanical seal according to claim 1, wherein the stationary ring assembly comprises a stationary ring (8) and a stationary ring cover (9); one side of the static ring (8) is sleeved in the static ring cover (9); the other side of the static ring (8) is abutted against the push ring (4).

5. A mechanical seal according to claim 1, characterized in that the spring seat (1) is fixed on the shaft (5) by means of a set screw (10); and a second sealing ring (11) is arranged between the spring seat (1) and the shaft (5).