CN216555363U

CN216555363U - Mechanical seal for scraper

Info

Publication number: CN216555363U
Application number: CN202123238066.9U
Authority: CN
Inventors: 周虎; 闻兰; 闻永华
Original assignee: JIANGSU HUAQING FLUID TECHNOLOGY CO LTD
Current assignee: JIANGSU HUAQING FLUID TECHNOLOGY CO LTD
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-05-17
Anticipated expiration: 2031-12-21

Abstract

The utility model discloses a mechanical seal for a scraper machine, which comprises a static ring assembly and a rotary ring assembly, wherein a static ring seat in the static ring assembly is fixedly connected with a flange, a static ring is inserted into the static ring seat and is fixedly connected with the static ring seat, the static ring is formed by splicing a pair of semi-static rings which are asymmetrically split along the axial direction and an inclined angle, the included angle between two split surfaces of each semi-static ring and the horizontal plane is respectively controlled to be 10-20 degrees, -20 degrees to-10 degrees, a lubricating oil way is arranged on the static ring seat, a gap between the static ring seat and a main machine shaft is communicated with the lubricating oil way, a counter bore arranged along the axial direction of the main machine shaft is also arranged on the static ring, and the mechanical seal further comprises a countersunk head screw inserted into the static ring seat after passing through the counter bore; the rotating ring assembly comprises a rotating sealing ring and a spring seat, and a spring for applying adhesive force to the rotating sealing ring is installed in the spring seat. The mechanical sealing structure is simple, good in sealing performance, free of dry friction between the static ring and the rotary sealing ring, convenient to assemble and disassemble and capable of avoiding dry friction between the static ring and the rotary sealing ring.

Description

Mechanical seal for scraper

Technical Field

The utility model relates to the technical field of mechanical seals, in particular to a mechanical seal for a scraper machine.

Background

The scraper conveyor is a continuous conveyor for bulk material conveyed by means of a moving scraper chain in a closed rectangular-section housing. At present, the mechanical seal for the scraper machine is a device for preventing fluid leakage, which is formed by keeping fit and relative sliding of a pair of sealing end faces vertical to a rotation axis under the action of fluid pressure and elasticity of a compensation mechanism and under the coordination of auxiliary seal.

In addition, the scraper machine belongs to a large-scale equipment device, the space between a main machine bearing seat body and a sealing cavity is narrow, and a driving machine, a coupler, a bearing box body and the like need to be disassembled when a mechanical seal is replaced, so that the static ring can be disassembled, and the equipment installation and maintenance cost is huge. In order to solve the problem of replacing the static ring, application No. 201822161445.4 (a full-section type dynamic sealing device) mentions that the static ring is formed by combining two parts which are integrally cut, and the static friction ring is also formed by combining the two parts, but in the patent, a holding screw for connecting the two parts is required to be arranged between the two parts when the static ring is installed, the holding screw is arranged along the radial direction of the static ring, the split static friction ring is arranged in the split static ring, the bottom surface (non-sealing surface) of the static friction ring is directly matched with the static ring to ensure the flatness of the sealing surface, but as the static ring is locked and combined into a whole by a radial screw, the machining error causes the deformation or the unevenness of the matching surface, the sealing surface of the static friction ring is deformed, and the risk of sealing leakage exists. Therefore, how to arrange a mechanical seal which is simple in structure, good in sealing performance and convenient to disassemble and assemble is the research direction of technicians in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a mechanical seal for a scraper machine.

In order to achieve the purpose, the utility model adopts the technical scheme that: a mechanical seal for a scraper machine comprises a stationary ring assembly and a rotating ring assembly, wherein the stationary ring assembly is installed on a flange of a seal cavity of a main machine, the rotating ring assembly is sleeved on a main machine shaft, the stationary ring assembly comprises a stationary ring and a stationary ring seat, the stationary ring seat is sleeved on the main machine shaft and is fixedly connected with the flange, the stationary ring is sleeved on the main machine shaft and is positioned on one side, away from the flange, of the stationary ring seat, the stationary ring is inserted into the stationary ring seat and is fixedly connected with the stationary ring seat, the stationary ring is formed by splicing a pair of semi-stationary rings which are asymmetrically split along an axial angle and an oblique angle, an included angle between two split surfaces of each semi-stationary ring and a horizontal plane is respectively controlled to be 10 degrees to 20 degrees to 10 degrees, an oil filling port is formed in the end face, facing one side of the stationary ring, of the stationary ring seat, a lubricating oil circuit communicated with an inner cavity of the oil filling port is further formed in the stationary ring seat, the lubricating oil path comprises a horizontal section parallel to the axis direction of the main shaft and a vertical section vertical to the axis direction of the main shaft, one end of the vertical section is communicated with the horizontal section, the other end of the vertical section penetrates through the inner side wall of the static ring seat, a gap between the static ring seat and the main shaft is communicated with the lubricating oil path, the static ring is further provided with a counter bore arranged along the axial direction of the main shaft, and the mechanical seal further comprises a counter bore screw which is inserted in the static ring seat after axially penetrating through the counter bore; rotatory ring assembly establishes at epaxial rotatory sealing ring of host computer and spring holder including the cover, install the spring that applies laminating power to the rotatory sealing ring in the spring holder, rotatory sealing ring by the spring is applyed thrust and is realized continuously laminating and rotate relatively with the stationary ring, forms the movive seal.

As a specific implementation mode, the bottom of one side of the counter bore close to the static ring seat is in a conical shape matched with the shape of a nut of the countersunk head screw.

As a specific implementation mode, a sealing ring I is arranged between the static ring seat and the flange, static sealing is formed between the static ring seat and the flange through the sealing ring I, and a sealing groove used for containing the sealing ring I is formed in one of the static ring seat and the flange.

As a specific implementation mode, an oil seal is arranged between the static ring seat and the flange.

In a specific embodiment, a seal ring ii is disposed between the rotary seal ring and the main shaft, and a floating seal is formed between the rotary seal ring and the main shaft by the seal ring ii.

As a specific implementation manner, the oil injection port is arranged above the main machine shaft, the counter bores are distributed on the stationary ring at equal intervals along the same circumferential direction, and the axial lead of the counter bore at the lowest position of the stationary ring and the axial lead of the main machine shaft are located in the same vertical plane.

In a specific embodiment, the stationary ring is made of polytetrafluoroethylene material filled with copper powder and graphite. The static ring is R-PTFE which is produced by Yonggong sealing element Limited company in Yangzhong city.

In a specific embodiment, the spring seat is fixedly connected with the main machine shaft through a set screw, and the axis direction of the set screw is perpendicular to the axis direction of the main machine shaft.

In a specific embodiment, the spring seat is in transmission connection with the rotary sealing ring through a transmission pin.

As a specific implementation manner, the spring seat is provided with a threaded through hole parallel to the axial lead direction of the main shaft, the rotary seal ring is provided with spring holes corresponding to the threaded through holes in position and number one to one, the springs penetrate through the threaded through holes and then are tightly pressed in the spring holes, and the mechanical seal further comprises an adjusting screw inserted in the threaded through hole along the axial lead direction of the mechanical seal and tightly pressed on the springs and used for adjusting the compression amount of the springs.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: according to the mechanical seal for the scraper machine, the static ring is provided with the counter bore, and sealing medium or lubricating oil can be stored in the counter bore, so that a liquid film is formed between the rotary seal ring and the static ring when a main machine runs, dry friction is avoided, and good sealing performance between the rotary seal ring and the static ring is ensured; in addition, the stationary ring seat is provided with a lubricating oil way, so that the effect of lubricating and cooling the end face of the friction pair can be achieved when the main engine runs, heat generated by friction can be dissipated in time, and the service life of parts is prolonged; in addition, the static ring adopts a pair of semi-static ring structures which are asymmetrically split in axial and oblique angles, the static ring and the static ring seat are fixed by arranging countersunk screws in counter bores, the static ring seat is an integral body, the static ring and the static ring can not cause the deformation of a matching surface when being matched, so the risk of uneven matching surface is avoided, the split static ring is convenient to assemble, the replacement of the static ring (a wearing part) can be realized in a narrow space without disassembling a driving machine, a coupler and a bearing box body, the equipment installation and maintenance cost is greatly reduced, the two asymmetric semi-static rings are simultaneously arranged, the included angles between two split surfaces on the semi-static ring and a horizontal plane are respectively 10-20 degrees, -20-10 degrees, the two semi-static rings can be rapidly combined into a whole circle, and the radial direction can not move, precisely directed to the stationary ring seat. Can be quick install two semi-stationary rings and there is not the gap between the two, need not to increase in addition and hold the screw tightly and can realize the fixed of both.

Drawings

FIG. 1 is a longitudinal cross-sectional view of a mechanical seal for a screed machine according to the present invention;

FIG. 2 is an axial view of a stationary ring in a mechanical seal for a scraper machine according to the present invention;

wherein: 1. a main spindle; 2. a flange; 3. a stationary ring seat; 4. a stationary ring; 5. rotating the seal ring; 6. a spring seat; 7. a spring; 8. a counter bore; 9. countersunk head screws; 10. a lubrication oil path; 11. a plug; 12. a sealing ring I; 13. oil sealing; 14. adjusting the screw; 15. tightening the screw; 16. a drive pin; 17. and a sealing ring II.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

A mechanical seal for a scraper machine comprises a stationary ring component arranged on a flange 2 of a seal cavity of a main machine and a rotating ring component sleeved on a main machine shaft 1. Here, the stationary ring assembly includes a stationary ring 4 and a stationary ring seat 3, and the rotating ring assembly includes a rotating seal ring 5, a spring seat 6, and a plurality of springs 7, as shown in fig. 1.

Specifically, in the stationary ring assembly, a stationary ring seat 3 is sleeved on a main machine shaft 1 and is fixedly connected with a flange 2 through an axially arranged bolt, a stationary ring 4 is sleeved on the main machine shaft 1 and is positioned on one side, far away from the flange 2, of the stationary ring seat 3, the stationary ring 4 is inserted into the stationary ring seat 3 and is fixedly connected with the stationary ring seat 3, the stationary ring 4 is formed by splicing a pair of semi-stationary rings which are asymmetrically split along the axial direction and an oblique angle, as shown in fig. 2, the two semi-stationary rings form a whole circle on the outer side of the main machine shaft 1, the included angle between two split surfaces of each semi-stationary ring and the horizontal plane is respectively controlled to be 10-20 degrees, -20 degrees to-10 degrees, the included angle is too small, and the stationary ring 4 is easy to slide radially and is not beneficial to installation; the contained angle is too big, and the semi-stationary ring of processing can produce the closed angle, easily collides with the damage, and the contained angle between two subdivision faces and the horizontal plane of this semi-stationary ring is 15 in this example, and another is-15, adopts this structure can be quick synthesizes whole circle with two semi-stationary rings, and radial direction can not take place to remove, leads to stationary ring seat 3 accurately. Here, the end face of the stationary ring seat 3 facing the stationary ring 4 is provided with an oil injection port, the stationary ring seat 3 is further provided with a lubricating oil path 10 communicated with an inner cavity of the oil injection port, the lubricating oil path 10 comprises a horizontal section parallel to the axial lead direction of the main shaft 1 and a vertical section perpendicular to the axial lead direction of the main shaft 1, one end of the vertical section is communicated with the horizontal section, the other end of the vertical section penetrates through the inner side wall of the stationary ring seat 3, a gap between the stationary ring seat 3 and the main shaft 1 is communicated with the lubricating oil path 10, the stationary ring 4 is further provided with a counter bore 8 arranged along the axial direction of the main shaft 1, the mechanical seal further comprises a counter head screw 9 inserted into the stationary ring seat 3 after passing through the counter bore 8 along the axial direction of the mechanical seal, here, the bottom of one side of the counter bore 8 close to the stationary ring seat 3 is in a conical shape matched with the nut shape of the counter head screw 9, the installation of the counter head screw 9 is facilitated by the conical shape, and simultaneously, the storage of sealing medium or lubricating oil is facilitated.

When assembling stationary ring 4, put two semi-stationary rings 4 in the synthetic whole circle in the outside of main shaft 1, then paint sealed glue on the subdivision composition surface and the side towards stationary ring seat 3, later insert stationary ring 4 stationary ring seat 3, thereby pack into stationary ring 4's counter bore 8 with countersunk screw 9 in again with the screw hole on stationary ring seat 3 screw up fixedly and effectively prevent the radial leakage of subdivision composition surface and stationary ring 4's circumferential direction, when the stationary ring 4 takes place wearing and tearing need to be changed, only need loosen countersunk screw 9, can take out stationary ring 4 and renew stationary ring 4 again, whole change process is swift, need not to dismantle other host computer spare parts. In addition, the counter bore 8 on the stationary ring 4 is not only used for installing the counter screw 9 to realize the fixation with the stationary ring seat 3, but also can store lubricating oil, so that a liquid film always exists between the stationary ring 4 and the rotary sealing ring 5 in the operation process of the main machine, the dry friction between the stationary ring 4 and the rotary sealing ring 5 is effectively prevented, and meanwhile, the sealing performance between the stationary ring and the rotary sealing ring can be improved; through setting up lubricated oil circuit 10, when the host computer was used for the first time, add appropriate amount lubricating oil at the oiling mouth of stationary ring seat 3, then plug up the oiling mouth through end cap 11, make the gap department between stationary ring seat 3, stationary ring 4 and host computer axle 1 fill lubricating oil, realize can playing the effect of the vice terminal surface of lubricated cooling friction when the host computer operation, in time dispel the heat that the friction produced.

In this example, referring to fig. 1, the oil injection port is disposed above the main shaft 1, and the counter bore 8 is disposed below the main shaft 1. Make the lubricating oil that injects from the oiling mouth downwards flow into between the clearance of stationary ring seat 3 and host shaft 1 along lubricated oil circuit 10 through this setting mode, lubricating oil flows into between the clearance of stationary ring 4 and host shaft 1 through the gap between host shaft 1 and stationary ring seat 3 in addition, according to the flow direction of lubricating oil, and counter bore 8 sets up the below at host shaft 1, can be at the rotatory in-process of rotary seal ring 5 relative stationary ring 4, there is some lubricating oil infiltration between the binding face of rotary seal ring 5 and stationary ring 4, guarantee to have the liquid film between rotary seal ring 5 and the stationary ring 4 all the time, sealing performance between the two has been guaranteed, and effectively prevent to take place dry friction between rotary seal ring 5 and stationary ring 4 simultaneously.

In this example, a sealing ring i 12 is arranged between the stationary ring seat 3 and the flange 2, a stationary seal is formed between the stationary ring seat 3 and the flange 2 through the sealing ring i 12, and one of the stationary ring seat 3 and the flange 2 is provided with a sealing groove for accommodating the sealing ring i 12. Specifically, the seal groove is provided on the end surface of the stationary ring base 3 on the side facing the flange 2.

In this embodiment, an oil seal 13 is further disposed between the stationary ring seat 3 and the flange 2, an oil seal framework for installing the oil seal 13 is disposed on one side end surface of the stationary ring seat 3 facing the flange 2, the oil seal framework is close to the main shaft 1, and the oil seal 13 is installed in the stationary ring seat 3 to prevent a large amount of solid media from entering a seal cavity formed by the stationary ring seat 3, the stationary ring 4 and the rotary seal ring 5, so as to improve the environment of the seal cavity.

Here, the rotating ring assembly includes a rotating seal ring 5 and a spring seat 6, which are sleeved on the main shaft 1, a spring 7 for applying a fitting force to the rotating seal ring 5 is installed in the spring seat 6, and the rotating seal ring 5 is continuously fitted with the stationary ring 4 to form a radial seal by applying a thrust force to the rotating seal ring 5 by the spring 7. The spring seat 6 is fixedly connected with the main shaft 1 through a set screw 15, and the axial lead direction of the set screw 15 is vertical to the axial lead direction of the main shaft 1. Meanwhile, the spring seat 6 is in transmission connection with the rotary sealing ring 5 through a transmission pin 16. The main shaft 1 drives the spring seat 6 to rotate, and the rotary sealing ring 5 rotates along with the rotation of the spring seat 6 through the transmission pin 16 and forms a dynamic seal with the attached static ring 4.

Here, the spring seat 6 is provided with a threaded through hole parallel to the axial lead direction of the main shaft 1, the rotary seal ring 5 is provided with spring holes corresponding to the threaded through hole in position and number one by one, the spring 7 penetrates through the threaded through hole and then is pressed in the spring hole, and the mechanical seal further comprises an adjusting screw 14 inserted in the threaded through hole along the axial lead direction of the mechanical seal and pressed on the spring 7 and used for adjusting the compression amount of the spring 7. A sealing ring II 17 is further arranged between the rotary sealing ring 5 and the main machine shaft 1, and floating sealing is formed between the rotary sealing ring and the main machine shaft through the sealing ring II 17.

Here, the stationary ring 4 is an R-PTFE stationary ring 4 manufactured by nyzhou permanent seal limited, and polytetrafluoroethylene used for the stationary ring 4 is filled with copper powder and graphite. The purpose of filling copper powder is to reduce the cold fluidity of pure polytetrafluoroethylene and creep deformation under load, improve the strength and wear resistance of parts, enhance the heat dissipation performance, lead out frictional heat in time and reduce the temperature of a sealing surface; the purpose of filling graphite is to effectively improve self-lubricating property, reduce friction coefficient, especially reduce heat generated by sealing friction when a sealing cavity is in a state of insufficient sealing medium or no medium, and improve the stability of mechanical sealing.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A mechanical seal for a scraper machine comprises a stationary ring assembly arranged on a flange of a seal cavity of a main machine and a rotating ring assembly sleeved on a main machine shaft, and is characterized in that the stationary ring assembly comprises a stationary ring and a stationary ring seat, the stationary ring seat is sleeved on the main machine shaft and fixedly connected with the flange, the stationary ring is sleeved on the main machine shaft and positioned on one side of the stationary ring seat far away from the flange, the stationary ring is inserted into the stationary ring seat and fixedly connected with the stationary ring seat, the stationary ring is formed by splicing a pair of semi-stationary rings which are asymmetrically split along an axial angle and an oblique angle, the included angle between two split surfaces of each semi-stationary ring and a horizontal plane is respectively controlled to be 10-20 degrees, -20-10 degrees, an oil filling port is formed in the end surface of the stationary ring seat facing one side of the stationary ring, and a lubricating oil way communicated with the inner cavity of the oil filling port is further formed in the stationary ring seat, the lubricating oil path comprises a horizontal section parallel to the axis direction of the main shaft and a vertical section vertical to the axis direction of the main shaft, one end of the vertical section is communicated with the horizontal section, the other end of the vertical section penetrates through the inner side wall of the static ring seat, a gap between the static ring seat and the main shaft is communicated with the lubricating oil path, the static ring is further provided with a counter bore arranged along the axial direction of the main shaft, and the mechanical seal further comprises a counter bore screw which is inserted in the static ring seat after axially penetrating through the counter bore; rotatory ring assembly establishes at epaxial rotatory sealing ring of host computer and spring holder including the cover, install the spring that applies laminating power to the rotatory sealing ring in the spring holder, rotatory sealing ring by the spring is applyed thrust and is realized continuously laminating and rotate relatively with the stationary ring, forms the movive seal.

2. The mechanical seal for the scraper machine of claim 1, wherein the bottom of the counterbore close to the static ring seat is in a conical shape matched with the shape of the nut of the countersunk screw.

3. The mechanical seal for the scraper machine according to claim 1, wherein a seal ring i is disposed between the stationary ring seat and the flange, a stationary seal is formed between the stationary ring seat and the flange by the seal ring i, and a seal groove for accommodating the seal ring i is formed on one of the stationary ring seat and the flange.

4. The mechanical seal for a scraper machine of claim 1, wherein an oil seal is provided between the stationary ring seat and the flange.

5. The mechanical seal for the scraper machine according to claim 1, wherein a seal ring ii is provided between the rotary seal ring and the main shaft, and a floating seal is formed therebetween by the seal ring ii.

6. The mechanical seal for the scraper machine of claim 1, wherein the oil injection port is disposed above the main shaft, and a plurality of counter bores are uniformly distributed on the stationary ring at intervals along the same circumferential direction, wherein the counter bore located at the lowest position of the stationary ring has an axis line in the same vertical plane as the axis line of the main shaft.

7. The mechanical seal for a scraper machine of claim 1, wherein the spring seat is fixedly connected to the main shaft by a set screw, and a shaft axis direction of the set screw is perpendicular to a shaft axis direction of the main shaft.

8. The mechanical seal for a scraper machine of claim 1, wherein the spring seat is in driving connection with the rotary seal ring through a driving pin.

9. The mechanical seal for the scraper machine of claim 1, wherein the spring seat is provided with threaded through holes parallel to the axial lead direction of the main shaft, the rotary seal ring is provided with spring holes corresponding to the threaded through holes in position and number one by one, the springs penetrate through the threaded through holes and then are pressed in the spring holes, and the mechanical seal further comprises adjusting screws inserted in the threaded through holes along the axial lead direction of the mechanical seal and pressed on the springs for adjusting the compression amount of the springs.