CN214093038U

CN214093038U - Improved mechanical seal for alumina slurry pump

Info

Publication number: CN214093038U
Application number: CN202023269500.5U
Authority: CN
Inventors: 沈伟健; 马正阳; 杨克允; 赵世超; 徐凡; 林韩波; 刘明威; 娄维尧; 蔡姚杰
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-08-31
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses an improved mechanical seal for an alumina slurry pump, which comprises a seal cavity, an atmosphere side seal gland, a medium side seal gland, a shaft end gland and a shaft sleeve, wherein the atmosphere side seal gland is arranged at one end of the seal cavity, and the medium side seal gland is arranged at the other end of the seal cavity; the sealing cavity is internally provided with a sealing assembly body, and the sealing assembly body comprises an atmosphere side sealing assembly body, a medium side sealing assembly body and a spring system arranged between the sealing assembly body and the medium side sealing assembly body. The sealing of the alumina slurry pump is improved, and the double-end-face large-spring mechanical sealing is adopted, so that the sealing effect can be effectively guaranteed while the mechanical sealing structure is simplified, the service life of the mechanical sealing is prolonged to a certain extent, and the maintenance cost of the mechanical sealing is reduced; can ensure the high-efficiency production of the alumina and promote the development of the alumina industry, and has great promotion effect on the development of mechanical seal.

Description

Improved mechanical seal for alumina slurry pump

Technical Field

The utility model relates to a mechanical seal technical field, concretely relates to mechanical seal is used to modified aluminium oxide thick liquid pump.

Background

Alumina is a high-hardness mixture, is widely applied in industry, and is also an important chemical raw material. Along with the gradual increase of the production scale, more and more practical industrial production problems appear, wherein one of the problems is the mechanical sealing problem of an alumina slurry pump.

The earliest contact mechanical seal in China is from pump equipment introduced to foreign countries in the oil refining industry, the mechanical seal is formally developed in the 20 th century and the 60 th century, the first mechanical seal standard in China is issued in 1975, and the second standard is issued in 1978. After the science and technology of 'sixty-five' and 'seventy-five' are passed through, foreign advanced technologies are introduced and are autonomously improved, the mechanical sealing level of medium-sized equipment reaches the foreign level, but a large gap is still formed between large-sized equipment and sealing materials. There is also room for great improvement in mechanical seal quality and reliability.

Mechanical seal for pump comprises high accuracy part, because the condition is comparatively complicated in aluminium oxide production process, the reason that became invalid is also manifold, through the mechanical seal who gets off to the inefficacy and carry out the analysis, reveals the condition and mainly has following five: the sealing between the shaft sleeve and the shaft, the sealing between the movable ring and the shaft sleeve, the sealing between the movable ring and the static ring, the sealing between the static ring and the static ring seat and the sealing between the sealing end cover and the pump body. However, these are only surface reasons, and the corresponding problems are to be solved, and the operation conditions and the medium characteristics are to be comprehensively analyzed. In the past, according to the characteristics of alumina, proper sealing materials are selected, whether a cooling water system is normal or not is checked before operation, whether leakage exists or not is checked, and then targeted prevention is carried out according to the problems. Although this has a certain effect, the problem is not actually solved, and an accident due to the failure of the mechanical seal may occur. It is therefore desirable to design a mechanical seal suitable for use in an alumina slurry pump.

SUMMERY OF THE UTILITY MODEL

To the above technical problem that prior art exists, the utility model aims to provide an improved mechanical seal for alumina slurry pump.

The technical scheme of the utility model as follows:

the improved mechanical seal for the alumina slurry pump is characterized by comprising a seal cavity, an atmosphere side seal gland, a medium side seal gland, a shaft end gland and a shaft sleeve, wherein the atmosphere side seal gland is arranged at one end of the seal cavity; a sealing assembly body is arranged in the sealing cavity, the sealing assembly body comprises an atmosphere side sealing assembly body, a medium side sealing assembly body and a spring system arranged between the sealing assembly body and the medium side sealing assembly body, the upper end of the atmosphere side sealing gland is provided with a cooling liquid inlet hole, and the lower end of the atmosphere side sealing gland is provided with a cooling liquid outlet hole; the upper end of the medium side sealing gland is provided with a flushing liquid inlet hole, and the lower end of the sealing cavity is provided with a flushing liquid outlet hole.

The improved mechanical seal for the alumina slurry pump is characterized in that the atmosphere side seal assembly body comprises an atmosphere side static ring, an atmosphere side dynamic ring and an atmosphere side push ring which are sequentially arranged along the axial direction; the static ring on the atmosphere side is provided with an O-shaped ring on the atmosphere side, and an O-shaped ring on the atmosphere side is arranged between the movable ring on the atmosphere side and the pushing ring on the atmosphere side.

The improved mechanical seal for the alumina slurry pump is characterized in that the medium side seal assembly body comprises a medium side push ring, a medium side movable ring and a medium side static ring which are sequentially arranged along the axial direction; and an O-shaped ring of the medium side movable ring is arranged between the medium side push ring and the medium side movable ring, and an O-shaped ring of the medium side stationary ring is arranged on the medium side stationary ring.

The improved mechanical seal for the alumina slurry pump is characterized in that a gasket is arranged between the medium side seal gland and the shaft end gland, and plays roles of sealing and abrasion resistance.

The improved mechanical seal for the alumina slurry pump is characterized in that gland O-shaped rings are respectively arranged between the medium side sealing gland and the sealing cavity and between the atmosphere side sealing gland and the sealing cavity.

The improved mechanical seal for the alumina slurry pump is characterized in that the spring system comprises a spring seat arranged on the shaft sleeve and two springs symmetrically arranged on the spring seat, wherein one spring is arranged on the outer side of the atmospheric side push ring, and the other spring is arranged on the outer side of the medium side push ring.

The improved mechanical seal for the alumina slurry pump is characterized by further comprising a flushing system and a back cooling system, wherein the flushing liquid inlet hole and the flushing liquid outlet hole are respectively connected with the flushing system, and the cooling liquid inlet hole and the cooling liquid outlet hole are respectively connected with the back cooling system.

The improved mechanical seal for the alumina slurry pump is characterized in that the flushing system comprises a liquid storage device, the liquid storage device is used for providing cleaning fluid for a flushing fluid inlet, the liquid storage device is externally connected with a pressure source through a pressure source switch and is provided with a pressure switch, a liquid level meter and a liquid filling switch.

The utility model has the advantages that:

1) the sealing of the alumina slurry pump is improved, and the double-end-face large-spring mechanical sealing is adopted, so that the sealing effect can be effectively guaranteed while the mechanical sealing structure is simplified, the service life of the mechanical sealing is prolonged to a certain extent, and the maintenance cost of the mechanical sealing is reduced; can ensure the high-efficiency production of the alumina and promote the development of the alumina industry, and has great promotion effect on the development of mechanical seal.

2) This mechanical seal still is equipped with rinse-system and back of the body cold system, and rinse-system can further reduce sealed temperature, can prevent the liquid film vaporization simultaneously, improves lubricated condition, goes out to a certain extent and seals the face on the granule object. The back cooling system adopts a direct cooling mode, generates higher temperature in the production process of the aluminum oxide, and forcibly cools the sealing parts due to the fact that the sealing parts can also cause temperature rise due to mutual friction under the operation condition.

Drawings

FIG. 1 is a schematic structural view of a mechanical seal for an alumina slurry pump according to the present invention;

FIG. 2 is a schematic view of an auxiliary system of the mechanical seal for an alumina slurry pump according to the present invention;

in the figure: 1-atmosphere side sealing gland, 2-atmosphere side static ring, 3-atmosphere side static ring O-shaped ring, 4-atmosphere side dynamic ring, 5-atmosphere side dynamic ring O-shaped ring, 6-atmosphere side push ring, 7-spring, 8-spring seat, 9-slotted cone end set screw, 10-sealing cavity, 11-medium side push ring, 12-medium side dynamic ring, 13-medium side dynamic ring O-shaped ring, 14-gland O-shaped ring, 15-medium side static ring, 16-medium side static ring O-shaped ring, 17-medium side sealing gland, 18-cylindrical pin, 19-shaft sleeve, 20-shaft end gland, 21-gasket, 22-hexagon head bolt I and 23-hexagon head bolt II.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described below with reference to specific embodiments shown in the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

As shown in fig. 1-2, an improved alumina slurry mechanical seal comprises an atmosphere side sealing gland 1, an atmosphere side static ring 2, an atmosphere side static ring O-shaped ring 3, an atmosphere side moving ring 4, an atmosphere side moving ring O-shaped ring 5, an atmosphere side pushing ring 6, a spring 7, a spring seat 8, a slotted cone end set screw 9, a seal cavity 10, a medium side pushing ring 11, a medium side moving ring 12, a medium side moving ring O-shaped ring 13, a gland O-shaped ring 14, a medium side static ring 15, a medium side static ring O-shaped ring 16, a medium side sealing gland 17, a cylindrical pin 18, a shaft sleeve 19, a shaft end gland 20, a gasket 21, a first hexagon head bolt 22 and a second hexagon head bolt 23.

The improved alumina slurry mechanical seal mainly comprises a seal cavity 10, an atmosphere side seal gland 1, a medium side seal gland 17, a shaft end gland 20 and a shaft sleeve 19.

The atmosphere side sealing gland 1 is arranged at one end of the sealing cavity 10, and the medium side sealing gland 17 is arranged at the other end of the sealing cavity 10; a sealing assembly is arranged in the sealing cavity 10, and the sealing assembly comprises an atmosphere side sealing assembly, a medium side sealing assembly and a spring system arranged between the sealing assembly and the medium side sealing assembly.

Further, the atmosphere side sealing assembly body comprises an atmosphere side static ring 2, an atmosphere side dynamic ring 4 and an atmosphere side push ring 6 which are sequentially arranged along the axial direction; an atmosphere side static ring O-shaped ring 3 is arranged on the atmosphere side static ring 2, and an atmosphere side moving ring O-shaped ring 5 is arranged between the atmosphere side moving ring 4 and the atmosphere side push ring 6.

Further, the medium side sealing assembly body comprises a medium side push ring 11, a medium side movable ring 12 and a medium side static ring 15 which are sequentially arranged along the axial direction; a medium side movable ring O-shaped ring 13 is arranged between the medium side push ring 11 and the medium side movable ring 12, and a medium side static ring O-shaped ring 16 is arranged on the medium side static ring 15.

Further, the spring system comprises a spring seat 8 arranged on the shaft sleeve 19 and two springs 7 symmetrically arranged on the spring seat 8, wherein one spring 7 is arranged outside the atmosphere side push ring 6, and the other spring 7 is arranged outside the medium side push ring 11.

Furthermore, gland O-rings 14 are respectively arranged between the atmosphere side sealing gland and the medium side sealing gland and between the medium side sealing gland and the sealing cavity, so that the sealing effect is achieved.

Further, a gasket 21 is arranged between the medium side sealing gland 17 and the shaft end gland 20, and plays a role in sealing and preventing abrasion.

Further, an auxiliary system of the mechanical seal is required to be equipped, so that a good operation environment can be created for the main seal and the auxiliary seal, and the service life of the mechanical seal is prolonged to a certain extent. The upper end of the atmosphere side sealing gland 1 is provided with a cooling liquid inlet, so that the cooling liquid can be conveniently input; the lower end is provided with a cooling liquid outlet for facilitating the outflow of cooling liquid, and the cooling liquid inlet hole and the cooling liquid outlet hole are respectively connected to a back cooling system (cooling water circulation system). The upper end of the medium side sealing gland 17 is provided with a washing liquid inlet hole for facilitating the input of cooling liquid, the lower end of the sealing cavity is provided with a washing liquid outlet hole, and the washing liquid inlet hole and the washing liquid outlet hole are respectively connected to a washing system.

Furthermore, the O-shaped ring is made of rubber material fully coated with fluoroplastic, so that good corrosion resistance and friction resistance can be obtained, and the service life is long.

The working principle is as follows:

the structure of the mechanical seal is double-end-face big spring type mechanical seal. When sealing, two end faces which are opposite and are vertical to the shaft are kept in fit under the action of fluid pressure and the elastic force of the compensation mechanism and matched with auxiliary sealing to achieve leakage resistance. And a pair of sealing friction pairs is added to seal the cooling water. During operation, sealing liquid needs to be injected into the sealing cavity to play roles in lubrication and plugging. The mechanical auxiliary system comprises a flushing system and a back cooling system, the flushing system can further reduce the sealing temperature, meanwhile, a liquid film can be prevented from vaporizing, the lubricating condition is improved, and particle objects on a sealing surface are removed to a certain extent. The back cooling system adopts a direct cooling mode, and because the temperature is higher in the production process of the alumina and the temperature of the sealing parts is also increased due to mutual friction under the operation condition, the back cooling system is required to carry out forced cooling.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The improved mechanical seal for the alumina slurry pump is characterized by comprising a seal cavity (10), an atmosphere side seal gland (1), a medium side seal gland (17), a shaft end gland (20) and a shaft sleeve (19), wherein the atmosphere side seal gland (1) is arranged at one end of the seal cavity (10), and the medium side seal gland (17) is arranged at the other end of the seal cavity (10); a sealing assembly body is arranged in the sealing cavity (10), the sealing assembly body comprises an atmosphere side sealing assembly body, a medium side sealing assembly body and a spring system arranged between the sealing assembly body and the medium side sealing assembly body, the upper end of the atmosphere side sealing gland (1) is provided with a cooling liquid inlet hole, and the lower end of the atmosphere side sealing gland is provided with a cooling liquid outlet hole; the upper end of the medium side sealing gland (17) is provided with a washing liquid inlet hole, and the lower end of the sealing cavity (10) is provided with a washing liquid outlet hole.

2. The improved mechanical seal for the alumina slurry pump according to claim 1, wherein the atmosphere side seal assembly comprises an atmosphere side static ring (2), an atmosphere side dynamic ring (4) and an atmosphere side push ring (6) which are arranged in sequence along the axial direction; the static ring (2) on the atmosphere side is provided with an O-shaped ring (3) on the atmosphere side, and an O-shaped ring (5) on the atmosphere side is arranged between the movable ring (4) on the atmosphere side and the push ring (6) on the atmosphere side.

3. The improved mechanical seal for the alumina slurry pump according to claim 2, wherein the medium side seal assembly comprises a medium side push ring (11), a medium side movable ring (12) and a medium side static ring (15) which are arranged in sequence along the axial direction; and a medium side moving ring O-shaped ring (13) is arranged between the medium side push ring (11) and the medium side moving ring (12), and a medium side static ring O-shaped ring (16) is arranged on the medium side static ring (15).

4. The improved mechanical seal for alumina slurry pumps of claim 1, characterized in that a gasket is arranged between the medium side gland (17) and the shaft end gland (20) to play the role of sealing and wear prevention.

5. The improved mechanical seal for the alumina slurry pump according to claim 1, wherein gland O-rings (14) are respectively arranged between the medium side sealing gland (17) and the atmosphere side sealing gland (1) and the seal cavity (10).

6. An improved mechanical seal for an alumina slurry pump according to claim 3, wherein the spring system comprises a spring seat (8) provided on the sleeve (19) and two springs (7) symmetrically provided on the spring seat (8), wherein one spring (7) is provided outside the atmosphere side thrust ring (6) and the other spring (7) is provided outside the medium side thrust ring (11).

7. The improved mechanical seal for an alumina slurry pump according to claim 3, further comprising a flushing system and a back cooling system, wherein the flushing liquid inlet hole and the flushing liquid outlet hole are respectively connected with the flushing system, and the cooling liquid inlet hole and the cooling liquid outlet hole are respectively connected with the back cooling system.

8. An improved mechanical seal for an alumina slurry pump according to claim 7, wherein the flushing system includes a reservoir for providing cleaning fluid to the flushing fluid inlet, the reservoir being connected to the pressure source via a pressure source switch and being equipped with a pressure switch, a level gauge, and a charging switch.