CN219673290U

CN219673290U - Sealing device for pulping pressure screen

Info

Publication number: CN219673290U
Application number: CN202320783845.7U
Authority: CN
Inventors: 关键; 蔡昌莎; 曹云鹏; 胡益军; 邹豪; 都森欣; 陆晶妮; 裘明权
Original assignee: Lopland Machinery & Equipment Ningbo Co ltd
Current assignee: Lopland Machinery & Equipment Ningbo Co ltd
Priority date: 2023-04-11
Filing date: 2023-04-11
Publication date: 2023-09-12
Anticipated expiration: 2033-04-11

Abstract

The utility model provides a sealing device for a pulping pressure screen, which comprises a shaft sleeve and a mounting flange, wherein a first mounting groove and a second mounting groove are respectively arranged at two ends of an inner cavity of the mounting flange; the inner wall of the mounting flange is also provided with a guide sleeve extending along the axial direction of the guide sleeve, two ends of the guide sleeve extend to the main sealing surface position of the main sealing assembly and the auxiliary sealing surface position of the auxiliary sealing assembly respectively, and flushing channels are reserved between the inner wall of the guide sleeve and the outer wall of the shaft sleeve and between the outer wall of the guide sleeve and the inner walls of the main sealing assembly and the auxiliary sealing assembly. The utility model provides a sealing device for a pulping pressure screen, which can be applied to a working condition with high rotating speed, and has stable sealing performance and long service life.

Description

Sealing device for pulping pressure screen

Technical Field

The utility model relates to the technical field of mechanical sealing, in particular to a sealing device for a pulping pressure screen.

Background

The pressure screen is an orifice plate type pulp screening device for medium and low concentration pulp screening procedure, and has the function of removing coarse slag which does not meet the paper making quality requirement in the pulp. The reliability and the working efficiency of the pressure screen are determined by a rotor, the sealing working condition of the pressure screen in a pulping workshop in the papermaking industry is poor, and the pulp concentration and the temperature of the pressure screen exceed the sealing application range of the general performance.

The conventional soft packing seal (packing) is easy to leak, has a low service life and is not suitable for high-concentration working conditions at high temperature. While mechanical seals are superior to soft-filler seals in sealing performance, the cost of manufacturing mechanical seals, as well as other difficulties, have been a constant challenge; because the mechanical seal is dynamic seal, the service life of the sealing ring which plays a key sealing role in the mechanical seal is generally lower, and because of the limitation of sealing materials, the sealing ring is easy to damage in high-temperature occasions, namely the service life is influenced; in addition, the mechanical sealing structure is generally complex in structure and numerous in parts, so that the problems of difficult replacement, high maintenance cost, high operation cost and the like are caused.

So at present, when the mechanical seal is applied, how to improve the service life of the sealing ring is very important.

Disclosure of Invention

The utility model solves the problem of overcoming the defects in the prior art, and provides the sealing device for the pulping pressure screen, which can be applied to working conditions of high temperature and high concentration, has stable sealing performance and long service life.

In order to solve the problems, the utility model provides a sealing device for a pulping pressure screen, which comprises a shaft sleeve and a mounting flange sleeved outside the shaft sleeve, wherein both ends of an inner cavity of the mounting flange are respectively and telescopically provided with a main static ring assembly and an auxiliary static ring assembly along the axial direction of the mounting flange, both ends of the shaft sleeve are detachably sleeved with a main ring assembly and an auxiliary dynamic ring which are respectively matched with the main static ring assembly, and both ends of the shaft sleeve are also provided with a first limiting step and a second limiting step which are respectively and axially used for limiting the movement of the main ring assembly and the auxiliary dynamic ring assembly towards the middle position of the shaft sleeve; the side wall of the mounting flange is provided with a liquid inlet communicated with the first mounting groove and a liquid outlet communicated with the second mounting groove; and a guide sleeve extending towards one side of the driving ring assembly is further assembled on the inner wall of the mounting flange, so that cooling liquid entering through the liquid inlet hole flows through the position of the driving ring assembly, then flows through the position of the auxiliary moving ring assembly, and finally flows out of the liquid outlet hole.

Compared with the prior art, the sealing device has the following advantages:

the sealing device for the pulping pressure screen has the advantages that the double-end-face sealing structure and the special flushing flow channel design ensure that flushing fluid fully flushes the main sealing end face and the secondary sealing end, and heat of the sealing face is taken away in time when the sealing face is flushed, so that the service life of the mechanical seal is prolonged; in addition, corresponding limit steps are respectively arranged at the two ends of the shaft sleeve in the structure, so that the position accuracy of the driving ring assembly and the main static ring assembly during installation is ensured, and the stability of the whole mechanical seal in use is also ensured.

Further, the driving ring assembly comprises a driving ring and a driving ring seat, one end of the driving ring seat is provided with a first mounting groove, one end of the driving ring is thermally embedded in the first mounting groove, and the other end of the driving ring is matched with the sealing surface of the main static ring assembly; and a first diversion inclined plane is arranged on the inner side of the driving ring near one end of the main static ring component. The driving ring assembly with the improved structure is of an embedded assembly structure, namely, the driving ring and the driving ring seat are assembled together in a hot assembly mode after being separately processed, so that the structural strength of the driving ring is ensured, and compared with an integral movable ring piece, the structure can also save the cost; in addition, the arrangement of the first guide inclined plane enables flushing liquid to flush the sealing grinding surface better, the cooling effect is increased, and the heat cracking of the sealing surface due to local high heat is avoided, so that the service life of the sealing surface is prolonged.

As an improvement, a first limiting groove matched with the first limiting step is formed in the inner wall of the driving ring seat near one end of the mounting flange; an avoidance groove is formed in the inner wall of the other end of the driving ring seat, a first clamping ring is sleeved on the outer wall of the shaft sleeve near one end of the driving ring, and the first clamping ring is axially limited on the end face of the avoidance groove. In the improved structure, the driving ring assembly and the shaft sleeve are in a sleeved fit mode, and are axially clamped and limited through the first clamping ring, so that the structure is simple, and the assembly and the disassembly are convenient.

And a sealing ring is arranged between the inner wall of the driving ring seat and the outer wall of the shaft sleeve, and a sealing gasket for preventing impurities from contacting the sealing ring is assembled in the avoidance groove. In the improved structure, the sealing ring is arranged to ensure the tightness between the driving ring assembly and the shaft sleeve, and in addition, the sealing gasket is arranged to isolate particle impurities at the medium end from entering the sealing ring, so that the sealing ring is prevented from being leaked due to abrasion, and the sealing performance of the whole sealing device is improved.

The main static ring assembly comprises a main static ring and a main static ring seat, one end of the main static ring seat is provided with a second mounting groove, one end of the main static ring is thermally inlaid in the second mounting groove, and the other end of the main static ring is in sealing fit with the driving ring; and a second diversion inclined plane is arranged on the inner side of the main static ring seat near one end of the main static ring. In the improved structure, the main static ring component is an embedded component, so that the connection strength between the main static ring and the main static ring seat is improved, and the installation between the integral main static ring component structure and the installation flange is convenient, and the main acting force acts on the main static ring seat in the assembling process with the installation flange, so that the main static ring can be better protected, namely the deformation of the sealing end surface of the main static ring due to the concentrated stress can be avoided, and the sealing performance of the sealing surface is ensured; in addition, the second diversion inclined plane increases the circumferential cooling area of the main sealing surface, improves the cooling efficiency and ensures the service life of the sealing ring.

The improved structure is characterized in that a first assembling groove and a second assembling groove are respectively formed in two ends of an inner cavity of the mounting flange, the main static ring assembly is slidably assembled in the first assembling groove, and the auxiliary static ring assembly is slidably assembled in the second assembling groove; the first assembly groove and the second assembly groove bottom are respectively provided with a plurality of first spring holes and second spring holes which are uniformly distributed along the circumferential direction, a plurality of first springs and second springs are respectively assembled in the first spring holes and the second spring holes, the other ends of the first springs and the second springs are respectively abutted with the end faces of the main static ring assembly and the auxiliary static ring assembly, and the first springs and the second springs are used for respectively providing axial compensation for the main static ring assembly and the auxiliary static ring assembly. In the improved structure, the main seal and the auxiliary seal are static ring compensation structures, and compensation force is provided for corresponding static ring assemblies through the form of a plurality of small springs, so that the compensation performance is stable, the stability of the sealing performance is ensured, and the leakage is not easy.

And the inner ends of the liquid inlet hole and the liquid outlet hole are respectively positioned at the bottoms of the first assembling groove and the second assembling groove and used for flushing the first spring and the second spring. Among the above-mentioned improvement structure, the special position setting of feed liquor hole and play liquid hole for the flushing fluid can also be fine when realizing sealed face flushing, cooling realization spring wash, avoid impurity particle to gather, influence the compensation performance of spring.

Drawings

FIG. 1 is a perspective view of a sealing device for a pulp pressure screen according to the present utility model;

FIG. 2 is a schematic view in semi-section of a sealing device for a pulping pressure screen of the present utility model;

FIG. 3 is an enlarged schematic view of the structure of the portion X in FIG. 2;

FIG. 4 is an enlarged schematic view of the structure at Y in FIG. 2;

fig. 5 is an enlarged schematic view of the structure at Z in fig. 2.

Reference numerals illustrate:

1. a shaft sleeve; 2. a mounting flange; 2.1, a first assembling groove; 2.2, a second assembling groove; 3. a first limit step; 4. a second limit step; 5. a liquid inlet hole; 6. a liquid outlet hole; 7. a guide sleeve; 8. a drive ring; 9. a drive ring seat; 10. a first mounting groove; 11. a first diversion ramp; 12. the first limit groove; 13. an avoidance groove; 14. a first snap ring; 15. a seal ring; 16. a sealing gasket; 17. a primary stationary ring; 18. a main stationary ring seat; 19. a second mounting groove; 20. a second diversion ramp; 21. a first spring; 22. a second spring; 23. an auxiliary moving ring; 24. an auxiliary moving ring seat; 25. a third mounting groove; 26. the second limit groove; 27. and a second snap ring.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

As shown in fig. 1 and 2, the utility model provides a sealing device for a pulping pressure screen, which comprises a shaft sleeve 1 sleeved outside a pressure screen rotating shaft and synchronously rotating with the pressure screen rotating shaft, wherein a mounting flange 2 is sleeved outside the shaft sleeve 1, and the mounting flange 2 is used for being fixedly connected with a mounting cavity of a centrifugal machine during mounting; in addition, a first assembling groove 2.1 and a second assembling groove 2.2 are respectively arranged at two ends of the inner cavity of the mounting flange 2, a main static ring component is assembled in the first assembling groove 2.1 in an axial sliding manner, a secondary static ring component is assembled in the second assembling groove 2.2 in an axial sliding manner, and in addition, a driving ring component and a main static ring component are respectively and detachably sleeved at two ends of the shaft sleeve 1, wherein a sealing surface of the driving ring component is in sealing fit with a sealing surface of the main static ring component, so that a main seal is formed; the sealing surface of the auxiliary moving ring component is in sealing fit with the sealing surface of the auxiliary static ring component to form auxiliary sealing, in the structure, the shaft sleeve 1, the driving ring component, the main static ring component, the mounting flange 2, the auxiliary static ring component and the auxiliary moving ring component are of a container type structure, namely, the whole sealing device is assembled into a whole in advance before being mounted in a pressure screen sealing cavity, and the whole sealing device is assembled and disassembled, so that the sealing device is easy to assemble on equipment, the assembling quality is ensured, and the sealing surface is protected from being polluted by sundries or damaged by misoperation before being mounted or started.

More specifically, in the structure, the two ends of the shaft sleeve 1 are further provided with the first limiting step 3 and the second limiting step 4 which are used for respectively axially limiting the movement of the driving ring assembly and the auxiliary moving ring assembly towards the middle position of the shaft sleeve 1, so that the axial positions of the driving ring assembly and the main static ring assembly are ensured to be stable during installation. Because the sealing device clamps and drives the left end and the right end of the shaft sleeve 1 through the impellers on the equipment in the use process, the space for driving the set screw or the key is saved, and the cost of the mechanical seal is reduced; two spacing steps in the above-mentioned structure can also prevent that sealing component from receiving the clamping force effect at both ends and influencing sealing element's axial position, guarantee sealing performance stable.

On the other hand, as shown in fig. 2, in the above structure, a liquid inlet hole 5 communicated with the first fitting groove 2.1 and a liquid outlet hole 6 communicated with the second fitting groove 2.2 are arranged on the side wall of the mounting flange 2; the inner wall of the mounting flange 2 is also provided with a guide sleeve 7 extending towards one side of the driving ring assembly, so that the cooling liquid entering from the liquid inlet hole 5 flows through the position of the driving ring assembly (main seal) and then flows through the position of the auxiliary moving ring assembly (auxiliary seal) under the drainage effect of the guide sleeve 7, and finally flows out of the liquid outlet hole 6, so that the flushing and cooling of the main seal and the auxiliary seal are realized, friction heat is timely taken away when impurities of the sealing surface are flushed away, and the service life of the sealing ring is prolonged; and the main sealing surface is flushed by the flushing liquid in the structure, and particles in the medium easily enter from the gap of the sealing ring because the main sealing surface is in direct contact with the medium end, and the performance of the main sealing is more critical, so that a flushing liquid path is designed to pass through the main sealing and then the auxiliary sealing during flushing.

In this embodiment, as shown in fig. 3, the driving ring assembly includes a driving ring 8 and a driving ring seat 9, one end of the driving ring seat 9 is provided with a first mounting groove 10, one end of the driving ring 8 is hot-inlaid in the first mounting groove 10, and the other end of the driving ring 8 is matched with a sealing surface of the main static ring assembly; and a first diversion inclined plane 11 is arranged on the inner side of the main driving ring 8 near one end of the main static ring component.

In addition, in the structure, the inner wall of the driving ring seat 9, which is close to one end of the mounting flange 2, is provided with a first limiting groove 12 matched with the first limiting step 3; the inner wall of the other end of the driving ring seat 9 is provided with an avoidance groove 13, the outer wall of the shaft sleeve 1 near one end of the driving ring 8 is sleeved with a first clamping ring 14, the first clamping ring 14 is axially limited on the end face of the avoidance groove 13, namely, the axial limitation of the driving ring assembly and the shaft sleeve 1 is realized through the first clamping ring 14, and meanwhile, the connection and the fixation of the driving ring seat 9 and the shaft sleeve 1 are effectively realized under the action of the first limiting step 3.

On the other hand, in order to ensure the sealing performance between the assembly structure of the driving ring assembly and the shaft sleeve 1, a sealing ring 15 is arranged between the inner wall of the driving ring seat 9 and the outer wall of the shaft sleeve 1, a sealing washer 16 for preventing impurities from contacting the sealing ring 15 is assembled in the avoiding groove 13, specifically, a sealing ring 15 groove is arranged on the inner wall of the driving ring seat 9, the outer ring of the sealing ring 15 is matched in the sealing ring 15 groove, and the inner ring is in sealing fit with the shaft sleeve 1; the preferred sealing gasket 16 is a flexible gasket made of PTFE material, and shields impurities in the pressure screen from entering the sealing type ring groove to protect the sealing ring 15.

On the other hand, as shown in fig. 4, the main static ring assembly comprises a main static ring 17 and a main static ring seat 18, one end of the main static ring seat 18 is provided with a second mounting groove 19, one end of the main static ring 17 is thermally embedded in the second mounting groove 19, and the other end of the main static ring 17 is in sealing fit with the driving ring 8; and a second diversion inclined plane 20 is arranged on the inner side of the main static ring seat 18 near one end of the main static ring 17.

In this embodiment, a plurality of first spring 21 holes and second spring 22 holes (not shown in the figure) are respectively formed at the bottoms of the first fitting groove 2.1 and the second fitting groove 2.2, the first springs 21 holes and the second springs 22 are respectively formed in the plurality of first spring 21 holes and the plurality of second spring 22 holes, and the other ends of the first springs 21 and the second springs 22 are respectively abutted against the end surfaces of the main static ring assembly and the auxiliary static ring assembly, so as to respectively provide axial compensation for the main static ring assembly and the auxiliary static ring assembly. Of course, in this structure, corresponding anti-rotation pins (not shown in the figure) are further disposed on the end surfaces of the main static ring 17 and the auxiliary static ring assembly respectively, corresponding anti-rotation pin holes are disposed at the bottoms of the first fitting groove 2.1 and the second fitting groove 2.2, and after the anti-rotation pins are disposed, the main static ring assembly and the auxiliary static ring assembly can be kept stable under the driving of the circumferential friction force of the main static ring assembly and the auxiliary dynamic ring assembly, and cannot circumferentially slip.

On the other hand, in the above structure, the inner ends of the liquid inlet hole 5 and the liquid outlet hole 6 are respectively positioned at the bottom of the first assembling groove 2.1 and the second assembling groove 2.2, so as to realize the flushing of the first spring 21 and the second spring 22.

As shown in fig. 2 and 5, the auxiliary moving ring assembly and the auxiliary static ring assembly in the embodiment are also in the form of an insert assembly, wherein the auxiliary moving ring assembly comprises an auxiliary moving ring 23 and an auxiliary moving ring seat 24, a third mounting groove 25 is formed on one end of the auxiliary moving ring seat 24, and the auxiliary moving ring 23 is in thermal insert fit in the third mounting groove 25; in addition, a second limiting groove 26 which is in axial limiting fit with the second limiting step 4 is formed in the inner wall, close to one end of the auxiliary moving ring seat 24, of the auxiliary moving ring seat 23, a second clamping ring 27 is clamped on the outer wall, far away from one end of the driving ring assembly, of the shaft sleeve 1, and the second clamping ring 27 abuts against and is limited on the end face of the other end of the auxiliary moving ring seat 24, so that the auxiliary moving ring seat 24 is installed and positioned on the shaft sleeve 1.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims

1. A sealing device for a pulping pressure screen, which is characterized in that: the device comprises a shaft sleeve (1) and a mounting flange (2) sleeved outside the shaft sleeve (1), wherein two ends of an inner cavity of the mounting flange (2) are respectively provided with a main static ring assembly and an auxiliary static ring assembly along the axial direction in a telescopic manner, two ends of the shaft sleeve (1) are detachably sleeved with a driving ring assembly respectively matched with the main static ring assembly and an auxiliary dynamic ring (23) matched with the auxiliary static ring assembly, and two ends of the shaft sleeve (1) are also provided with a first limiting step (3) and a second limiting step (4) which are respectively used for axially limiting the driving ring assembly and the auxiliary dynamic ring assembly to move towards the middle position of the shaft sleeve (1); the side wall of the mounting flange (2) is provided with a liquid inlet hole (5) and a liquid outlet hole (6); the inner wall of the mounting flange (2) is also provided with a guide sleeve (7) extending towards one side of the driving ring assembly, so that cooling liquid entering from the liquid inlet hole (5) flows through the position of the driving ring assembly under the drainage effect of the guide sleeve (7) before flowing through the position of the auxiliary moving ring assembly, and finally flows out from the liquid outlet hole (6).

2. The sealing device for a pulping pressure screen according to claim 1, wherein: the driving ring assembly comprises a driving ring (8) and a driving ring seat (9), a first mounting groove (10) is formed in one end of the driving ring seat (9), one end of the driving ring (8) is in hot-insert fit in the first mounting groove (10), and the other end of the driving ring (8) is matched with a sealing surface of the main static ring assembly; and a first diversion inclined plane (11) is arranged on the inner side of the driving ring (8) near one end of the main static ring component.

3. The sealing device for a pulping pressure screen according to claim 2, wherein: a first limiting groove (12) matched with the first limiting step (3) is formed in the inner wall, close to one end of the mounting flange (2), of the driving ring seat (9); an avoidance groove (13) is formed in the inner wall of the other end of the driving ring seat (9), a first clamping ring (14) is sleeved on the outer wall of the shaft sleeve (1) close to one end of the driving ring (8), and the first clamping ring (14) is axially limited on the end face of the avoidance groove (13).

4. A sealing device for a pulping pressure screen according to claim 3, characterized in that: a sealing ring (15) is arranged between the inner wall of the driving ring seat (9) and the outer wall of the shaft sleeve (1), and a sealing gasket (16) for preventing impurities from contacting the sealing ring (15) is assembled in the avoidance groove (13).

5. The sealing device for a pulping pressure screen according to claim 2, wherein: the main static ring assembly comprises a main static ring (17) and a main static ring seat (18), a second mounting groove (19) is formed in one end of the main static ring seat (18), one end of the main static ring (17) is thermally inlaid in the second mounting groove (19), and the other end of the main static ring (17) is in sealing fit with the driving ring (8); and a second diversion inclined plane (20) is arranged on the inner side of the main static ring seat (18) near one end of the main static ring (17).

6. A sealing device for a pulping pressure screen according to any of claims 1 to 5, characterized in that: a first assembling groove and a second assembling groove (2.2) are respectively arranged at two ends of the inner cavity of the mounting flange (2), the main static ring component is assembled in the first assembling groove in a sliding manner, and the auxiliary static ring component is assembled in the second assembling groove (2.2) in a sliding manner; the bottoms of the first assembling groove and the second assembling groove (2.2) are respectively provided with a plurality of first spring holes and second spring holes which are uniformly distributed along the circumferential direction, a plurality of first springs (21) and second springs (22) are respectively assembled in the first spring holes and the second spring holes, the other ends of the first springs (21) and the second springs (22) are respectively abutted with the end faces of the main static ring assembly and the auxiliary static ring assembly, and the axial compensation is respectively provided for the main static ring assembly and the auxiliary static ring assembly.

7. The sealing device for a pulping pressure screen according to claim 6, wherein: the inner ends of the liquid inlet hole (5) and the liquid outlet hole (6) are respectively positioned at the bottoms of the first assembling groove and the second assembling groove (2.2) and used for flushing the first spring (21) and the second spring (22).