CN219413003U

CN219413003U - Double-end-face mechanical sealing structure for high-pressure slurry pump

Info

Publication number: CN219413003U
Application number: CN202320241692.3U
Authority: CN
Inventors: 刘鹏飞; 兰凯旋
Original assignee: Shanghai Xierjun Fluid Technology Co ltd
Current assignee: Shanghai Xierjun Fluid Technology Co ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-07-25
Anticipated expiration: 2033-02-17

Abstract

The utility model relates to a double-end-face mechanical sealing structure for a high-pressure slurry pump, wherein a shaft sleeve is sleeved on a rotating shaft, one side of the shaft sleeve is in sealing fit with a non-compensation ring, the other side of the shaft sleeve is provided with a locking ring, the non-compensation ring is attached with a compensation ring, the compensation ring is in sealing fit with a compensation ring seat, the compensation ring seat is in sealing fit with a first gland, the first gland is in sealing fit with a second gland, and the second gland is in sealing fit with an atmosphere side sealing assembly; the atmosphere side seal assembly is arranged in a cavity surrounded by the first gland, the second gland and the shaft sleeve, a clamping groove between the first gland and the compensation ring seat is axially formed along the rotating shaft, a plurality of fluid dynamic pressure grooves are formed between the first gland and the compensation ring seat and uniformly distributed around the rotating shaft, a compensation ring anti-rotation pin is arranged between the compensation ring and the compensation ring seat, and the compensation ring anti-rotation pin is sleeved in the compensation ring anti-rotation pin sheath. The utility model has small bending moment, small deformation, less heat productivity, low end surface temperature and no edge breakage or chipping.

Description

Double-end-face mechanical sealing structure for high-pressure slurry pump

Technical Field

The utility model relates to the technical field of sealing, in particular to a double-end-face mechanical sealing structure for a high-pressure slurry pump, which has the advantages of small bending moment, small deformation, reduced end face pressure deformation, small heating value, low end face temperature and capability of avoiding edge breakage or fragmentation.

Background

A slurry pump (slurry pump) is a centrifugal pump in terms of its operation principle, and conceptually means a device for converting electric energy into kinetic energy and potential energy of a medium by a mechanism that increases the energy of a solid-liquid mixed medium by centrifugal force (rotation of an impeller of the pump). Is mainly applicable to the fields of industries such as mines, power plants, dredging, metallurgy, chemical industry, building materials, petroleum and the like. The name slurry pump is a centrifugal pump divided from the point of view of the transport medium. In addition, the slurry pump can be particularly divided into different types from different angles. Besides pumping water, the water pump can also pump air, solid-liquid mixture-mineral powder slurry-! The proportion of the water pump power consumption in the total national electric quantity is very large, the energy-saving condition of the water pump has an important influence on national economy, and the water pump plays an active role in the energy-saving link and plays an important role in the thermal power generation emission reduction process. The slurry pump not only saves energy by 4% -8% compared with similar products, but also contributes to the release of haze from the atmosphere.

Pumps suitable for transporting liquids (water) containing suspended solids are generally referred to as slurry pumps. At present, the device is one of indispensable equipment in each technological process of mineral separation and coal separation plants. The slurry pump can be divided into single-stage/multi-stage, single-suction/double-suction, cantilever, horizontal/vertical and horizontal/vertical combination of pump shell, etc. according to different principles, as shown in the figure, its basic structure is formed from impeller, pump shell, pump shaft, bearing and bracket, the power also includes motor, counter-wheel or rubber belt wheel coupling, etc., the wear-resisting component also includes lining plate shaft sleeve, etc., the sealing component includes shaft seal, auxiliary impeller, etc., the supporting component includes support, etc., but the internal principle is identical, when the impeller is quickly rotated, the blade can make medium quickly rotated, the rotating medium can fly out from impeller under the action of centrifugal force, after the medium in the pump is thrown out, the central portion of impeller can form vacuum region, and the medium can be pressed into the feed pipe by means of pipe network under the action of atmospheric pressure (or water pressure). Thus, continuous feeding can be realized without circulation, thereby achieving the lift and flow required by the process design. Of course, the feeding mode adopts a press-in mode at present, namely the material level is higher than that of the feeding pipe, and the step of pouring water from the water feeding pipe or the pump shell into the interior can be omitted.

The slag slurry contains a large amount of granular media, and the sealing end surface of the media side needs to be made of hard-to-hard matching materials. The PV value of the common hard-to-hard material is low, the abrasion of the sealing end face under high pressure is serious, and the service life is short. The compensating ring and the non-compensating ring are made of hard-to-hard materials, the end face can be started with large torque, and the position of the anti-rotation pin of the compensating ring is provided with the starting impact that the driving pin is easy to deform or the compensating ring is easy to break. The medium side seal is an outflow type seal, and the sealing under high pressure is matched with the thermal deformation and pressure deformation of the end face, and the sealing liquid on the inner diameter side is in a divergent taper. Sealing liquid is difficult to enter the sealing end face, the end face lubrication effect is poor, the heating value is large, and the mechanical seal is fast invalid.

At present, mechanical sealing under the working condition mostly uses foreign imported products. The hard sealing ring material with patent by foreign sealing manufacturers has low friction coefficient, small sealing heating value and good sealing use effect. The double-end-face mechanical sealing structure for the high-pressure slurry pump is small in bending moment, small in deformation, small in heating value, low in end face temperature and capable of reducing end face pressure deformation and avoiding edge breakage or chipping.

Disclosure of Invention

The utility model aims to provide a double-end-face mechanical sealing structure for a high-pressure slurry pump, which has the advantages of small bending moment, small deformation, less end face pressure deformation, small heating value and low end face temperature, and avoids edge breakage or fragmentation.

A double-end-face mechanical seal structure for a high-pressure slurry pump, comprising:

the shaft sleeve is sleeved on the rotating shaft, one side of the shaft sleeve is in sealing fit with a non-compensation ring, the other side of the shaft sleeve is provided with a locking ring, the non-compensation ring is attached to the compensation ring, the compensation ring is in sealing fit with a compensation ring seat, the compensation ring seat is in sealing fit with a first gland, the first gland is in sealing fit with a second gland, and the second gland is in sealing fit with an atmosphere side sealing assembly;

the atmosphere side seal assembly is located in a cavity surrounded by the first gland, the second gland and the shaft sleeve, a clamping groove between the first gland and the compensation ring seat is axially formed along the rotating shaft, a plurality of fluid dynamic pressure grooves are formed between the first gland and the compensation ring seat and uniformly distributed around the rotating shaft, a compensation ring anti-rotation pin is arranged between the compensation ring and the compensation ring seat, and the compensation ring anti-rotation pin is sleeved in a compensation ring anti-rotation pin sheath.

And springs are arranged in the fluid dynamic pressure grooves, and the springs in the fluid dynamic pressure grooves are compressed when the first gland moves relative to the compensation ring seat.

The first gland is in sealing fit with the slurry pump flange.

The compensation ring anti-rotation pin sheath is clamped between the compensation ring and the compensation ring seat.

The bottom interface of the locking ring is an arrow, the upper part of the locking ring is two inclined rings, and the inclined rings are connected through bolts.

The shaft sleeve is sleeved on a rotating shaft, one side of the shaft sleeve is hermetically matched with a non-compensation ring, the other side of the shaft sleeve is provided with a locking ring, the non-compensation ring is attached to a compensation ring, the compensation ring is hermetically matched with a compensation ring seat, the compensation ring seat is hermetically matched with a first gland, the first gland is hermetically matched with a second gland, and the second gland is hermetically matched with an atmosphere side sealing assembly; the atmosphere side seal assembly is arranged in a cavity surrounded by the first gland, the second gland and the shaft sleeve, a clamping groove between the first gland and the compensation ring seat is axially formed along the rotating shaft, a plurality of fluid dynamic pressure grooves are formed between the first gland and the compensation ring seat and uniformly distributed around the rotating shaft, a compensation ring anti-rotation pin is arranged between the compensation ring and the compensation ring seat, and the compensation ring anti-rotation pin is sleeved in the compensation ring anti-rotation pin sheath. The utility model has small bending moment, small deformation, less heat productivity, low end surface temperature and no edge breakage or chipping.

Drawings

FIG. 1 is a cross-sectional view of the present utility model;

FIG. 2 is an enlarged view of a portion of the present utility model I;

FIG. 3 is an enlarged view of a portion of the utility model II;

FIG. 4 is a cross-sectional view of the hydrodynamic grooves of the present utility model;

in the figure: 1. the device comprises a first gland, 2, a second gland, 3, shaft sleeves, 4, a non-compensation ring, 5, a compensation ring, 6, a compensation ring seat, 7, an atmosphere side sealing assembly, 8, a locking ring, 9, a compensation ring anti-rotation pin, 10, a compensation ring anti-rotation pin sheath, 11, a rotation shaft, 12, a slurry pump flange, 13 and a fluid dynamic pressure groove.

Detailed Description

The utility model is further described below with reference to the drawings and specific examples.

A double-end-face mechanical seal structure for a high-pressure slurry pump, comprising: the shaft sleeve 3 is sleeved on the rotating shaft 11, one side of the shaft sleeve 3 is in sealing fit with the non-compensating ring 4, the locking ring 8 is arranged on the other side of the shaft sleeve 3, the non-compensating ring 4 is attached to the compensating ring 5, the compensating ring 5 is in sealing fit with the compensating ring seat 6, the compensating ring seat 6 is in sealing fit with the first gland 1, the first gland 1 is in sealing fit with the second gland 2, and the second gland 2 is in sealing fit with the atmosphere side sealing assembly 7; the atmosphere side seal assembly 7 is located in a cavity surrounded by the first gland 1, the second gland 2 and the shaft sleeve 3, a clamping groove between the first gland 1 and the compensation ring seat 6 is axially formed along the rotating shaft 11, a plurality of hydrodynamic grooves 13 are formed between the first gland 1 and the compensation ring seat 6, the hydrodynamic grooves 13 are uniformly distributed around the rotating shaft 11, a compensation ring anti-rotation pin 9 is arranged between the compensation ring 5 and the compensation ring seat 6, and the compensation ring anti-rotation pin 9 is sleeved in the compensation ring anti-rotation pin sheath 10.

The hydrodynamic grooves 13 are provided with springs, and when the first gland 1 moves relative to the compensating ring seat 6, the springs in the hydrodynamic grooves 13 are compressed. The first gland 1 is in sealing fit with the slurry pump flange 12. The compensating ring anti-rotation pin sheath 10 is clamped between the compensating ring 5 and the compensating ring seat 6. The bottom interface of the locking ring 8 is an arrow, the upper part is two inclined rings, and the inclined rings are connected through bolts.

The compensating ring 5 is thickened, and the circumference of the inner diameter is provided with an arc-shaped dynamic pressure groove. The compensation ring seat 6 is hermetically arranged, and the compensation ring 5 and the compensation ring seat 6 are prevented from rotating by the anti-rotation pin 9. The compensating ring anti-rotation pin 9 is provided with a compensating ring anti-rotation pin sheath 10.

The compensation ring 5 is thickened, so that the influence caused by the deformation of the end face pressure can be reduced. The circular arc-shaped dynamic pressure groove is formed in the circumference of the inner diameter of the compensation ring 5, so that the inner side sealing liquid can effectively enter the sealing end face, the sealing end face has good lubrication effect, small heating value, low end face temperature and small end face thermal deformation. The starting torque of the end face is reduced. The sealing is provided with the compensation ring seat 6, the clearance between the compensation ring 5 and the compensation ring seat 6 is small, the bending moment born by the anti-rotation pin 9 is small, and the deformation of the anti-rotation pin is small. The anti-rotation pin 9 is provided with a sheath 10, so that the brittle material compensation ring 5 can be effectively prevented from edge breakage or fracture under the starting impact.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a bi-polar face mechanical seal structure for high pressure slurry pump which characterized in that includes:

the shaft sleeve (3), the shaft sleeve (3) is sleeved on the rotating shaft (11), one side of the shaft sleeve (3) is in sealing fit with the non-compensation ring (4), the locking ring (8) is arranged on the other side of the shaft sleeve, the non-compensation ring (4) is attached to the compensation ring (5), the compensation ring (5) is in sealing fit with the compensation ring seat (6), the compensation ring seat (6) is in sealing fit with the first gland (1), the first gland (1) is in sealing fit with the second gland (2), and the second gland (2) is in sealing fit with the atmosphere side sealing assembly (7);

the atmospheric side seal assembly (7) is arranged in a cavity surrounded by the first gland (1), the second gland (2) and the shaft sleeve (3), a clamping groove between the first gland (1) and the compensation ring seat (6) is axially formed along the rotating shaft (11), a plurality of hydrodynamic grooves (13) are formed between the first gland (1) and the compensation ring seat (6), the hydrodynamic grooves (13) are uniformly distributed around the rotating shaft (11), a compensation ring anti-rotation pin (9) is arranged between the compensation ring (5) and the compensation ring seat (6), and the compensation ring anti-rotation pin (9) is sleeved in the compensation ring anti-rotation pin sheath (10).

2. The double-end-face mechanical sealing structure for the high-pressure slurry pump according to claim 1, wherein a spring is arranged in the hydrodynamic groove (13), and the spring in the hydrodynamic groove (13) is compressed when the first gland (1) moves relative to the compensation ring seat (6).

3. The double-end-face mechanical sealing structure for the high-pressure slurry pump according to claim 1 is characterized in that the first gland (1) is in sealing fit with the slurry pump flange (12).

4. The double-end-face mechanical sealing structure for the high-pressure slurry pump according to claim 1, wherein the compensating ring anti-rotation pin sheath (10) is clamped between the compensating ring (5) and the compensating ring seat (6).

5. The double-end-face mechanical sealing structure for the high-pressure slurry pump according to claim 1, wherein the bottom interface of the locking ring (8) is an arrow, the upper part is two inclined rings, and the inclined rings are connected through bolts.