CN221704446U - Sealing structure of high-pressure machine seal - Google Patents

Abstract

The utility model belongs to the technical field of high-pressure seals, in particular to a sealing structure of a high-pressure seal, which comprises a gland; an upper stationary ring is fixedly connected to the bottom of the gland; the bottom of the upper stationary ring is rotationally connected with a lower movable ring; the top of the gland is fixedly connected with a static ring seat; the bottom of the lower moving ring is rotationally connected with a spring seat; the static ring seat, the gland, the upper static ring, the lower dynamic ring and the spring seat are integrally assembled; the top of the static ring seat is rotationally connected with a gasket; through making static ring seat, gland, last static ring, lower moving ring and spring holder integrated equipment design, preassemble into a whole before the installation, after checking and pressure testing pass, the suit is epaxial in the axle seal case to guarantee normal sealed effect, still be convenient for check assembly quality, also just so assemble in advance, check and experimental seal assembly, guarantee installation and assembly quality easily, protect sealed face not receive debris pollution or damage because of misoperation before installation or start.

Description

A sealing structure of a high pressure mechanical seal

Technical Field

The utility model relates to the technical field of high-pressure mechanical seals, in particular to a sealing structure of a high-pressure mechanical seal.

Background Art

A high-pressure mechanical seal refers to a device that prevents fluid leakage by having at least one pair of end faces perpendicular to the axis of rotation, which remain in contact and slide relative to each other under the action of fluid pressure and the elastic force or magnetic force of a compensation mechanism and the cooperation of an auxiliary seal.

A Chinese patent with publication number CN214999400U discloses a new mechanical seal structure suitable for high pressure, which belongs to the field of mechanical seal technology and includes a shaft body, a shaft sleeve is sleeved on the surface of the shaft body, a pressure cover is sleeved on the surface of the shaft sleeve, a sealing ring structure is provided between the shaft sleeve and the pressure cover, an anti-rotation structure is provided between the shaft sleeve and the pressure cover and on one side of the sealing ring structure, and a gasket is provided on one side of the pressure cover; the utility model adopts the arrangement of the shaft sleeve, the sealing ring structure and the anti-rotation structure, so that the shaft sleeve will press the sealing ring structure when it rotates with the shaft body, and the gap between the static ring and the dynamic ring is pressed together, so that the surfaces of the static ring and the dynamic ring are tightly attached to the inner sides of the shaft sleeve and the pressure cover, thereby achieving the purpose of sealing. Through the arrangement of this device, the problem of mechanical seal not being able to withstand high pressure and the problem of poor anti-rotation effect can be effectively solved, the stability of the mechanical seal can be improved, and the mechanical seal can withstand higher pressure, thereby increasing the service life of the mechanical seal.

As mentioned above, the patent provides a new mechanical seal structure suitable for high pressure. Although it solves the problem that the mechanical seal cannot withstand high pressure and the anti-rotation effect is poor, it improves the stability of the mechanical seal and makes the mechanical seal resistant to higher pressure, thereby increasing the service life of the mechanical seal. However, when in use, there is a circumferential gap between the shaft and the equipment, and 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, the overall sealing effect needs to be improved. In addition, when performing maintenance, there are many corresponding parts that need to be dismantled one by one. The workload of maintenance is large, and the overall adaptability of use still has room for improvement.

Here we provide a sealing structure for a high pressure mechanical seal.

Utility Model Content

Therefore, the technical problem to be solved by the present invention is to overcome the prior art.

In order to solve the above technical problems, the utility model provides a sealing structure of a high-pressure mechanical seal, including a pressure cover; the bottom of the pressure cover is fixedly connected with an upper static ring; the bottom of the upper static ring is rotatably connected with a lower dynamic ring; the top of the pressure cover is fixedly connected with a static ring seat; the bottom of the lower dynamic ring is rotatably connected with a spring seat; the static ring seat, pressure cover, upper static ring, lower dynamic ring and spring seat are designed as an integrated assembly; the top of the static ring seat is rotatably connected with a gasket; the surfaces of the static ring seat, pressure cover, upper static ring, lower dynamic ring and spring seat are all rotatably connected with shaft sleeves.

In one embodiment of the utility model, the inner wall of the sleeve is rotatably connected to a transmission shaft; one end of the transmission shaft sequentially passes through the stationary ring seat, the pressure cover, the upper stationary ring, the lower dynamic ring and the spring seat; the top of the stationary ring seat is rotatably connected to a transmission ring.

In an embodiment of the utility model, a set screw is threadedly connected to the surface of the transmission ring; one end of the set screw passes through the transmission ring and the transmission shaft in sequence and extends to the inside of the transmission shaft.

In one embodiment of the utility model, the surface of the gasket is rotatably connected to the surface of the transmission shaft and the bottom of the transmission ring respectively; the surface of the stationary ring seat and the inner wall of the spring seat are both sleeved with O-rings; the surface of the upper stationary ring and the surface of the lower dynamic ring are both sleeved with connecting sealing rings.

In an embodiment of the present invention, the material of the upper stationary ring is tungsten carbide; the material of the lower dynamic ring is silicon carbide; and the material of the gasket is tetrafluoroethylene.

In one embodiment of the utility model, a dustproof collar is rotatably connected to the bottom of the lower moving ring and the inner wall of the spring seat; and a dustproof spring is fixedly connected to the bottom of the dustproof collar.

In one embodiment of the utility model, an upper card cover is clamped on the top of the stationary ring seat; a lower card cover is clamped on the bottom of the stationary ring seat; and the surface of the transmission shaft and the surfaces of the upper card cover and the lower card cover are all rotatably connected.

In one embodiment of the utility model, a connecting bolt is clamped on the surface of the lower clamping cover; one end of the connecting bolt passes through the lower clamping cover, the static ring seat and the upper clamping cover in sequence and extends to the top of the upper clamping cover; a tight gasket is sleeved on the surface of the connecting bolt located at the top of the upper clamping cover; a fixing nut is threadedly connected to the top of the tight gasket and on the surface of the connecting bolt.

The above technical solution of the utility model has the following advantages compared with the prior art:

The sealing structure of a high-pressure mechanical seal described in the utility model is designed by assembling a static ring seat, a pressure cover, an upper static ring, a lower dynamic ring and a spring seat in an integrated manner, which are pre-assembled into a whole before installation, and are sleeved on the inner shaft of a shaft seal box after being inspected and pressure tested to ensure a normal sealing effect, and are also convenient for checking the assembly quality. It is also precisely this kind of sealing component that has been assembled, inspected and tested in advance that is easy to ensure the installation and assembly quality, and protect the sealing surface from being contaminated by debris or damaged due to operating errors before installation or startup.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

FIG1 is a cross-sectional view of a partial structure of the utility model;

FIG2 is a first perspective view of the present invention;

FIG3 is a perspective view of the structure of the utility model from above;

FIG4 is a first perspective view of a partial structure of the utility model;

FIG. 5 is a second stereoscopic view of a partial structure of the present invention.

Explanation of the reference numerals in the accompanying drawings in the specification: 1. gland; 2. upper stationary ring; 3. lower moving ring; 4. stationary ring seat; 5. spring seat; 6. gasket; 7. bushing; 8. transmission shaft; 9. transmission ring; 10. set screw; 11. O-ring; 12. connecting sealing ring; 13. dustproof sleeve ring; 14. dustproof spring; 15. upper clamping cover; 16. lower clamping cover; 17. connecting bolt; 18. tight washer; 19. fixing nut.

DETAILED DESCRIPTION

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

Referring to Figures 1-5, a sealing structure of a high-pressure mechanical seal includes a gland 1; the bottom of the gland 1 is fixedly connected to an upper static ring 2; the bottom of the upper static ring 2 is rotatably connected to a lower dynamic ring 3; the top of the gland 1 is fixedly connected to a static ring seat 4; the bottom of the lower dynamic ring 3 is rotatably connected to a spring seat 5; the static ring seat 4, the gland 1, the upper static ring 2, the lower dynamic ring 3 and the spring seat 5 are an integrated assembly design; the top of the static ring seat 4 is rotatably connected to a gasket 6; the static ring seat 4, the gland 1, the upper static ring 2, the lower dynamic ring 3 and the spring seat 5 The surface of the seat 5 is rotatably connected with a shaft sleeve 7; when working, the pressure cover 1 is stuck between the upper static ring 2 and the static ring seat 4, and the upper static ring 2 is pressed and connected, and the lower dynamic ring 3 can rotate, and the other part is arranged in the spring seat 5 and rotates inside the spring seat 5. Before installation, the static ring seat 4, the pressure cover 1, the upper static ring 2, the lower dynamic ring 3 and the spring seat 5 are assembled into a whole, and then checked and proofread. After ensuring that they are qualified, they are installed in the bearing box to ensure normal sealing effect, while protecting the sealing surface from being contaminated by debris or damaged due to operating errors.

Further, as shown in Figures 1, 4 and 5, the inner wall of the sleeve 7 is rotatably connected with a transmission shaft 8; one end of the transmission shaft 8 sequentially penetrates the stationary ring seat 4, the pressure cover 1, the upper stationary ring 2, the lower dynamic ring 3 and the spring seat 5; the top of the stationary ring seat 4 is rotatably connected with a transmission ring 9; the surface of the transmission ring 9 is threadedly connected with a set screw 10; one end of the set screw 10 sequentially penetrates the transmission ring 9 and the transmission shaft 8 and extends to the inside of the transmission shaft 8; the surface of the gasket 6 is rotatably connected to the surface of the transmission shaft 8 and the bottom of the transmission ring 9 respectively; the surface of the stationary ring seat 4 and the inner wall of the spring seat 5 are both sleeved with O-rings 11; the surface of the upper stationary ring 2 and the surface of the lower dynamic ring 3 are both sleeved with connecting sealing rings 12; the material of the upper stationary ring 2 is tungsten carbide; the material of the lower dynamic ring 3 is The material of the gasket 6 is silicon carbide; the material of the gasket 6 is tetrafluoroethylene; when working, the transmission shaft 8 can rotate in the sleeve 7, and the transmission ring 9 is connected to the transmission shaft 8 by using the set screw 10, so that the transmission shaft 8 can drive the transmission ring 9 to rotate together after the rotation of the transmission shaft 8, the gasket 6 supports the transmission ring 9 for rotation, the O-ring 11 protects the inner walls of the static ring seat 4 and the spring seat 5 for rotation, and the connecting sealing ring 12 seals the gap between the upper static ring 2 and the lower dynamic ring 3 to prevent leakage. The upper static ring 2 is made of tungsten carbide, and its high hardness is used to ensure the service life of the machine seal. The material of the lower dynamic ring 3 is silicon carbide, and its high temperature resistance is used to prevent it from being deformed during rotation. The material of the gasket 6 is tetrafluoroethylene, and its high temperature resistance and corrosion resistance are used to work for a long time, thereby ensuring the service life of the machine seal.

Further, as shown in Figures 2, 4 and 5, a dustproof collar 13 is rotatably connected to the bottom of the lower moving ring 3 and the inner wall of the spring seat 5; a dustproof spring 14 is fixedly connected to the bottom of the dustproof collar 13; an upper card cover 15 is clamped on the top of the static ring seat 4; a lower card cover 16 is clamped on the bottom of the static ring seat 4; the surface of the transmission shaft 8 and the surfaces of the upper card cover 15 and the lower card cover 16 are all rotatably connected; a connecting bolt 17 is clamped on the surface of the lower card cover 16; one end of the connecting bolt 17 passes through the lower card cover 16, the static ring seat 4 and the upper card cover 15 in sequence and extends to The top of the upper card cover 15; the surface of the connecting bolt 17 located at the top of the upper card cover 15 is sleeved with a tight gasket 18; the top of the tight gasket 18 and the surface of the connecting bolt 17 are threadedly connected with a fixing nut 19; when working, the dustproof ring 13 cooperates with the dustproof spring 14 to prevent dust from the inside, and also ensures the sealing effect. The upper card cover 15 and the lower card cover 16 protect the inside, and the connecting bolt 17 is used to cooperate with the tight gasket 18 and the fixing nut 19 to fix the upper card cover 15 and the lower card cover 16 on the static ring seat 4, so as to achieve protection and further seal the inside.

Working principle: Since the above patent provides a new mechanical seal structure suitable for high pressure, although it solves the problem that the mechanical seal is not resistant to high pressure and the anti-rotation effect is poor, the stability of the mechanical seal is improved, and the mechanical seal can withstand higher pressure, thereby increasing the service life of the mechanical seal. However, when in use, there is a circumferential gap between the shaft and the equipment, and 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, the overall sealing effect needs to be improved. In addition, when performing maintenance, there are many corresponding parts that need to be dismantled one by one, and the maintenance workload is large. The overall adaptability of use still has room for improvement. The problem is that when working, the pressure cover 1 is stuck between the upper static ring 2 and the static ring seat 4, and the upper static ring 2 is pressed and connected. The lower dynamic ring 3 can rotate, and the other part is set in the spring seat 5 and rotates inside the spring seat 5. Before installation, the static ring seat 4, the pressure cover 1, the upper static ring 2, the lower dynamic ring 3 and the spring seat 5 are first assembled into a whole, and then checked and proofread. After ensuring that they are qualified, they are installed in the bearing box to ensure normal sealing effect. At the same time, the sealing surface is protected from contamination by debris or damage due to operational errors. The transmission shaft 8 can rotate in the sleeve 7, and the transmission ring 9 is connected to the transmission shaft 8 by the set screw 10, so that the transmission shaft 8 can drive the transmission ring 9 together after rotating. Rotation, gasket 6 supports the transmission ring 9 for rotation, O-ring 11 protects the inner wall of the static ring seat 4 and the spring seat 5 for rotation, and the connecting sealing ring 12 seals the gap between the upper static ring 2 and the lower dynamic ring 3 to prevent leakage. The upper static ring 2 is made of tungsten carbide, and its high hardness is used to ensure the service life of the machine seal. The material of the lower dynamic ring 3 is silicon carbide, and its high temperature resistance is used to prevent it from deforming during rotation. The material of the gasket 6 is tetrafluoroethylene, and its high temperature resistance and corrosion resistance are used to work for a long time to ensure the service life of the machine seal. The dustproof sleeve ring 13 cooperates with the dustproof spring 14 to prevent dust from the inside, and also ensures the sealing effect. The upper card cover 15 and the lower card cover 16 is used to protect the interior, and the upper card cover 15 and the lower card cover 16 are fixed on the static ring seat 4 using the connecting bolts 17 in conjunction with the tight gasket 18 and the fixing nut 19. While achieving protection, the interior is further sealed. The static ring seat 4, the pressure cover 1, the upper static ring 2, the lower dynamic ring 3 and the spring seat 5 are designed as an integrated assembly, pre-assembled into a whole before installation, and after inspection and pressure testing, they are mounted on the inner shaft of the shaft seal box to ensure normal sealing effect and facilitate inspection of assembly quality. It is also such a sealing component that is assembled, inspected and tested in advance that it is easy to ensure installation and assembly quality, and protect the sealing surface from being contaminated by debris or damaged by operating errors before installation or startup.

Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims (8)

1. A sealing structure for a high-pressure mechanical seal, characterized in that: it comprises a gland (1); the bottom of the gland (1) is fixedly connected to an upper static ring (2); the bottom of the upper static ring (2) is rotatably connected to a lower dynamic ring (3); the top of the gland (1) is fixedly connected to a static ring seat (4); the bottom of the lower dynamic ring (3) is rotatably connected to a spring seat (5); the static ring seat (4), the gland (1), the upper static ring (2), the lower dynamic ring (3) and the spring seat (5) are designed as an integrated assembly; the top of the static ring seat (4) is rotatably connected to a gasket (6); the surfaces of the static ring seat (4), the gland (1), the upper static ring (2), the lower dynamic ring (3) and the spring seat (5) are all rotatably connected to a shaft sleeve (7). 2. A sealing structure for a high-pressure mechanical seal according to claim 1, characterized in that: the inner wall of the sleeve (7) is rotatably connected to a transmission shaft (8); one end of the transmission shaft (8) sequentially passes through the stationary ring seat (4), the pressure cover (1), the upper stationary ring (2), the lower dynamic ring (3) and the spring seat (5); the top of the stationary ring seat (4) is rotatably connected to a transmission ring (9). 3. A sealing structure for a high-pressure mechanical seal according to claim 2, characterized in that: a surface of the transmission ring (9) is threadedly connected with a set screw (10); one end of the set screw (10) passes through the transmission ring (9) and the transmission shaft (8) in sequence and extends to the interior of the transmission shaft (8). 4. According to claim 1, a sealing structure of a high-pressure mechanical seal is characterized in that: the surface of the gasket (6) is rotatably connected to the surface of the transmission shaft (8) and the bottom of the transmission ring (9) respectively; the surface of the stationary ring seat (4) and the inner wall of the spring seat (5) are both sleeved with O-rings (11); the surface of the upper stationary ring (2) and the surface of the lower dynamic ring (3) are both sleeved with connecting sealing rings (12). 5. A sealing structure for a high-pressure mechanical seal according to claim 1, characterized in that: the material of the upper static ring (2) is tungsten carbide; the material of the lower dynamic ring (3) is silicon carbide; and the material of the gasket (6) is tetrafluoroethylene. 6. A sealing structure for a high-pressure mechanical seal according to claim 1, characterized in that: a dustproof ring (13) is rotatably connected to the bottom of the lower moving ring (3) and located on the inner wall of the spring seat (5); and a dustproof spring (14) is fixedly connected to the bottom of the dustproof ring (13). 7. A sealing structure for a high-pressure mechanical seal according to claim 2, characterized in that: an upper card cover (15) is clamped on the top of the static ring seat (4); a lower card cover (16) is clamped on the bottom of the static ring seat (4); the surface of the transmission shaft (8) and the surfaces of the upper card cover (15) and the lower card cover (16) are all rotatably connected. 8. A sealing structure of a high-pressure mechanical seal according to claim 7, characterized in that: a connecting bolt (17) is clamped on the surface of the lower card cover (16); one end of the connecting bolt (17) passes through the lower card cover (16), the static ring seat (4) and the upper card cover (15) in sequence and extends to the top of the upper card cover (15); a tight gasket (18) is sleeved on the surface of the connecting bolt (17) located on the top of the upper card cover (15); a fixing nut (19) is threadedly connected to the top of the tight gasket (18) and on the surface of the connecting bolt (17).