CN219139819U

CN219139819U - Mechanical seal stationary ring assembly

Info

Publication number: CN219139819U
Application number: CN202223487629.2U
Authority: CN
Inventors: 于平超; 臧祖玄; 臧蕴棋; 王凯; 宋泽铭
Original assignee: Dandong Jialong Machinery Manufacturing Co ltd
Current assignee: Dandong Jialong Machinery Manufacturing Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-06-06
Anticipated expiration: 2032-12-27

Abstract

The utility model relates to a static ring assembly of a mechanical seal, which consists of a static ring, a static ring sealing ring, an end ring, an anti-rotation pin, a positioning clamping spring and a gland, wherein the outer circular surface of the static ring is in clearance fit with an inner spigot slotted hole which is opened backwards on the gland, the end ring is installed in the inner spigot slotted hole of the gland at the rear end of the static ring in a sliding fit manner, the end ring is axially limited and fixed by the positioning clamping spring, the anti-rotation pin is radially and fixedly installed on the end ring to prevent the static ring from rotating, the structure is simple, the negative pressure in a pumping sealing cavity of a pump is completely prevented from being generated, the static ring is separated from the original position, the heat dissipation effect at the end part of the static ring sealing is good, the static ring and the static ring sealing ring are easy to disassemble and replace, and the static ring sealing ring is simple and convenient to replace.

Description

Mechanical seal stationary ring assembly

Technical Field

The present utility model relates to mechanical seals, and in particular to a stationary ring assembly for a mechanical seal.

Background

The mechanical seal stationary ring assembly mainly comprises a stationary ring, a stationary ring sealing ring, an anti-rotation pin and a gland, wherein an inner spigot groove is formed in the front end face of the gland, the outer circular face of the stationary ring is installed in a clearance sliding fit with the inner spigot groove formed in the gland, an outer spigot groove is formed in the rear portion of the stationary ring, the stationary ring sealing ring is installed in the outer spigot groove formed in the rear portion of the stationary ring, and the stationary ring anti-rotation pin is arranged between the rear end portion of the stationary ring and the gland to prevent rotation of the stationary ring.

The pump of the partial machine used in petroleum, petrochemical industry and the like can generate evacuation negative pressure during operation, so that the back pressure phenomenon of a mechanical seal cavity is caused, and when the back pressure in the pump pumping negative pressure mechanical seal cavity is large, the movable ring and the stationary ring can move axially together, so that the stationary ring is separated from the original matching position relation with the end cover, the matching clamping of the stationary ring and the mounting groove on the pressure cover is caused, the automatic correct resetting is not realized, and the leakage is serious due to the fact that the matching design relation between the stationary ring and the movable ring is damaged; even the outer circle of the static ring is separated from the matching surface of the mounting groove on the pressure cover, and the rotation preventing pin is separated, so that the mechanical seal is completely disabled.

In addition, the traditional mechanical seal quiet ring assembly can appear quiet ring sealing washer when the installation and cut off the meat by the gland or cut off the damage phenomenon such as meat by quiet ring afterbody, and unable in time discover the maintenance after quiet ring sealing washer damages moreover, only can discover when pressing the operation and detecting or installing the operation on the equipment, so inspection and maintenance to quiet ring sealing washer are inconvenient.

In the prior art, a PLAN53 scheme (namely, a serial mechanical seal is adopted, the sealing hydraulic pressure of a secondary mechanical seal cavity is larger than that of a primary mechanical seal), a static ring of the primary mechanical seal also needs an anti-back pressure structure, and the structure (shown in figure 2) is that a baffle and a clamping ring are added in front of the static ring to prevent the static ring from being separated from the original position, but the baffle and the clamping ring parts arranged around the front end part of the static ring of the structure occupy the space around the sealing end face of the front end of the static ring greatly, so that the axial exposed size of the end face of the static ring becomes smaller, the diffusion of the rubbing heat of the sealing end face and the cooling effect of flushing liquid (sealing liquid) on the static ring are obviously influenced, and the service life of the mechanical seal is directly influenced; in addition, the structure is inconvenient to disassemble and assemble due to the fact that the static ring end face is scratched and damaged easily in the disassembling and assembling process.

Disclosure of Invention

The utility model aims to improve the defects of the prior art, and provides a mechanical seal static ring assembly which is used for preventing a back pressure static ring from being separated and has good heat dissipation effect when a static ring seal end part is washed and cooled.

The utility model discloses a static ring assembly of a mechanical seal, which consists of a static ring, a static ring sealing ring, an end ring, an anti-rotation pin, a positioning clamp spring and a gland.

An inner spigot slot hole with a backward opening is formed in a gland, an outer spigot table is formed in the front portion of a stationary ring, the outer circular surface of the stationary ring is in clearance fit with the inner spigot slot hole formed in the gland, an outer spigot slot (namely a stationary ring sealing ring mounting groove) is formed in the rear portion of the stationary ring, a stationary ring sealing ring is mounted on the outer spigot slot, an end ring is mounted in the inner spigot slot hole of the stationary ring rear end gland in a sliding fit manner, the front end of the end ring stretches into the outer spigot slot formed in the rear portion of the stationary ring and abuts against the stationary ring sealing ring, a positioning clamp spring is mounted on the inner spigot slot hole of the stationary ring rear end gland, the positioning clamp spring axially limits and fixes the end ring, an anti-rotation pin is fixedly mounted on the end ring in a radial direction, the outer end portion of the anti-rotation pin is matched with an end through clamping slot formed in the outer end of the inner spigot slot hole of the gland, and the inner end portion of the anti-rotation pin is matched with a groove formed in the rear of the stationary ring to prevent rotation of the stationary ring.

The utility model has simple structure and convenient manufacture, completely prevents the negative pressure in the pumping sealing cavity of the pump from generating so as to lead the static ring to deviate from the original position, ensures that the axial dimension of the end face of the static ring is exposed greatly, ensures that the periphery of the end face of the static ring can be fully washed and cooled, has good washing and cooling heat dissipation effects at the sealing end part of the static ring, and prolongs the service life of the mechanical seal; meanwhile, the static ring and the static ring sealing ring are arranged on the rear side of the gland, so that the damage to the sealing ring caused by the end cover and the static ring can be avoided, and whether the static ring and the static ring sealing ring have problems and abrasion or not can be timely observed and checked, the static ring and the static ring sealing ring are easy to assemble and disassemble, and the replacement is simple and convenient.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a prior art structure.

Detailed Description

The utility model discloses a static ring assembly of a mechanical seal, which consists of a static ring 1, a static ring sealing ring 2, an end ring 3, an anti-rotation pin 4, a positioning clamp spring 5 and a gland 6.

The gland 6 is provided with an inner spigot slot 61 which is opened backwards, the front part of the static ring 1 is provided with an outer spigot table 11, the outer circular surface 10 of the static ring 1 is in clearance fit with the inner spigot slot 61 which is opened on the gland 6, the rear part of the static ring 1 is provided with an outer spigot slot 12, the outer spigot slot 12 is provided with a static ring sealing ring 2, the end ring 3 is arranged in the inner spigot slot 61 of the rear end gland 6 of the static ring 1 in a sliding fit manner, the front end of the end ring 3 extends into the outer spigot slot 12 which is opened at the rear part of the static ring 1 and is abutted against the static ring sealing ring 2, the positioning clamp spring 5 is arranged on the inner spigot slot 61 of the rear end gland 6 of the end ring 3, the positioning clamp spring 5 carries out axial limiting and anti-falling fixation on the end ring 3, the anti-rotation pin 4 is radially fixedly arranged on the end ring 3, the outer end part of the anti-rotation pin 4 is matched with an end through clamp slot 64 which is opened at the outer end of the inner spigot slot 61 of the gland 6, and the inner end part of the anti-rotation pin 4 is matched with a groove 14 which is opened at the rear part of the static ring 1 to prevent the static ring 1 from rotating.

The utility model has the advantages that the application test is carried out on the pump position of 107-P-108A/B of China sea oil Huizhou petrochemical company, P-102B of China petrochemical group Nanjing chemical industry, P9002AB of Shandong Yongtai technology, so that the operation effect is good, and the design and use requirements are met.

Claims

1. The mechanical seal stationary ring assembly is characterized by comprising a stationary ring, a stationary ring sealing ring, an end ring, an anti-rotation pin, a positioning clamp spring and a gland;

an inner spigot slot hole with a backward opening is formed in a gland, an outer spigot table is formed in the front portion of a stationary ring, the outer circumferential surface of the stationary ring is in clearance fit with the inner spigot slot hole formed in the gland, an outer spigot slot is formed in the rear portion of the stationary ring, a stationary ring sealing ring is mounted on the outer spigot slot, an end ring is mounted in the inner spigot slot hole of the gland at the rear end of the stationary ring in a sliding fit manner, the front end of the end ring stretches into the outer spigot slot formed in the rear portion of the stationary ring and is abutted against the stationary ring sealing ring, a positioning clamp spring is mounted on the inner spigot slot hole of the gland at the rear end of the end ring, the positioning clamp spring axially limits and fixes the end ring, an anti-rotation pin is fixedly mounted on the end ring in a radial direction, the outer end portion of the anti-rotation pin is matched with an end through clamping slot formed in the outer end of the inner spigot slot hole of the gland, and the inner end portion of the anti-rotation pin is matched with a groove formed in the rear of the stationary ring to prevent rotation of the stationary ring.