CN220082129U

CN220082129U - Double-end-face mechanical seal applied to high-concentration ore pulp equipment

Info

Publication number: CN220082129U
Application number: CN202321004671.6U
Authority: CN
Inventors: 吴磊波; 冯贤良
Original assignee: NINGBO TIANGONG MACHINERY SEALING CO LTD
Current assignee: Ningbo Tiangong Fluid Technology Co ltd
Priority date: 2023-04-26
Filing date: 2023-04-26
Publication date: 2023-11-24
Anticipated expiration: 2033-04-26

Abstract

The utility model provides a double-end-face mechanical seal applied to high-concentration ore pulp equipment, which comprises a shaft sleeve and a mounting flange, wherein a main static ring assembly and an auxiliary static ring assembly are respectively assembled at two ends of an inner cavity of the mounting flange; a limiting protrusion is arranged on the inner cavity wall of the mounting flange, and a limiting groove matched with the limiting protrusion is arranged on the main static ring component and/or the auxiliary static ring component; an elastic compensation piece is arranged between the main static ring component and the auxiliary static ring component. The utility model provides a double-end-face mechanical seal applied to high-concentration ore pulp equipment, which has the advantages of simple structure, convenience in disassembly and assembly, stable sealing performance and long service life, and can be applied to high-concentration working conditions.

Description

Double-end-face mechanical seal applied to high-concentration ore pulp equipment

Technical Field

The utility model relates to the technical field of mechanical sealing, in particular to a double-end-face mechanical sealing applied to high-concentration ore pulp equipment.

Background

The desulfurization pump is a common ore pulp device, and can adapt to various working conditions, such as conveying acid, alkaline clear liquid or slurry; various corrosive ore pulp in smelting industry; the pump is corrosion-resistant and wear-resistant, and has a very wide application range. Has the following characteristics: strong wear resistance, impact resistance and corrosion resistance. The desulfurizing pump is one of the key equipments in petrochemical industry, chemical fiber, pharmacy and steel production, and has unique use condition and operation characteristics compared with other rotating mechanical equipment.

When the desulfurization pump is operated, the medium in the pump contains desulfurization slag slurry, the slag slurry contains a large amount of hard particles with different sizes, and the medium has strong scouring capability, so that the rotating shaft of the equipment also has relatively large axial movement, and therefore, the working condition brings higher requirements on the mechanical sealing performance; for example, the wear resistance, the scouring resistance and the axial movement of the rotating shaft can be adapted, and the sealing performance is kept stable.

The existing mechanical seal of the desulfurization pump has complex structure and poor capability of coping with the movement of a rotating shaft of equipment, so that the sealing performance is unstable, and the environment pollution is easily caused by leakage; the method cannot be well applied to high-concentration working conditions, and the service life is not enough; in addition, the mechanical sealing structure of the prior desulfurization pump is complex and inconvenient to assemble and disassemble.

Disclosure of Invention

The utility model solves the problems of overcoming the defects in the prior art, and provides the double-end-face mechanical seal applied to the high-concentration ore pulp equipment, which has the advantages of simple structure, convenience in disassembly and assembly, stable sealing performance and long service life, and can be applied to the working condition of high concentration.

In order to solve the problems, the utility model provides a double-end-face mechanical seal applied to high-concentration ore pulp equipment, which comprises a shaft sleeve and a mounting flange sleeved outside the shaft sleeve, wherein a main static ring component and an auxiliary static ring component which can slide along the axial direction of the mounting flange are respectively arranged at two ends of an inner cavity of the mounting flange, and the main static ring component and the auxiliary static ring component are in limit fit in the circumferential direction; the two ends of the shaft sleeve are respectively provided with a driving ring assembly and a secondary moving ring assembly, the driving ring assembly is in sealing fit with the primary static ring assembly to form a primary seal, and the secondary moving ring assembly is in sealing fit with the secondary static ring assembly to form a secondary seal; a limiting protrusion is arranged on the inner cavity wall of the mounting flange, and a limiting groove matched with the limiting protrusion is arranged on the main static ring component and/or the auxiliary static ring component; an elastic compensation piece is arranged between the main static ring assembly and the auxiliary static ring assembly, so that the main static ring assembly and the auxiliary static ring assembly always have the trend of moving towards the main static ring assembly and the auxiliary dynamic ring assembly respectively.

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

the mechanical sealing mechanism is a double-end mechanical seal, namely a main seal at a medium end and an auxiliary seal at an atmosphere end, and the auxiliary seal can have a temporary sealing effect when the main seal fails, so that leaked medium is prevented from being directly leaked into the atmosphere, and environmental pollution is avoided; in addition, in the structure, the main static ring component and the auxiliary static ring component are in limit fit along the circumferential direction, and at least one component is provided with a limit groove for limit fit with a limit protrusion on the mounting flange, and the limit between the two components and the mounting flange in the circumferential direction can be realized only by one limit protrusion, so that the structure is simple, and the assembly and the disassembly are convenient; in still another aspect, an elastic compensation piece is arranged between the main static ring assembly and the auxiliary static ring assembly, namely, the two static ring assemblies share one elastic compensation piece, so that the internal structure of the mechanical seal is simplified, the balance of compensation forces of the two static ring assemblies is ensured, and the sealing stability of the two sealing surfaces is better ensured; the main seal and the auxiliary seal are static ring compensation type, and the reasonable gap and the two sides of the main seal and the auxiliary seal share compensation elements, so that the mechanical seal achieves proper axial displacement, and the pump body working condition with corresponding axial displacement can be better adapted.

Further, the main static ring assembly comprises a main static ring and a main static ring seat, a first mounting groove is formed in one end of the main static ring seat, the main static ring is assembled in the first mounting groove, a first sealing ring is arranged between the circumferential outer wall of the main static ring and the inner wall of the first mounting groove, and a first flexible gasket is arranged between the tail end of the main static ring and the bottom of the first mounting groove; the other end of the main stationary ring seat is provided with two symmetrical first bosses, and each first boss is provided with a limiting groove. In the structure, a floating type assembling structure is adopted between the main static ring and the main static ring seat, so that the problems of high overall alloy cost and easy deformation of common hot-inlaid structure are avoided, and meanwhile, a flexible gasket is arranged at the bottom of the dynamic and static ring; the problem that the dynamic and static rings deform and the mechanical seal fails due to the stress effect of the uneven bottom of the metal seat on the dynamic and static rings under high pressure is avoided.

Still further, the auxiliary stationary ring assembly comprises an auxiliary stationary ring and an auxiliary stationary ring seat, one end of the auxiliary stationary ring seat is provided with a second mounting groove, the auxiliary stationary ring is assembled in the second mounting groove, a second sealing ring is arranged between the circumferential outer wall of the auxiliary stationary ring and the inner wall of the second mounting groove, and a second flexible gasket is arranged between the tail end of the auxiliary stationary ring and the bottom of the second mounting groove; two symmetrical second bosses are arranged at the other end of the auxiliary static ring seat, and each second boss is provided with a limiting groove; the two second bosses are respectively in limit fit between the two first bosses along the circumferential direction, and any one of the limit grooves is matched with the limit protrusions.

And the side wall of the mounting flange is provided with a liquid inlet hole and a liquid outlet hole respectively, and the liquid inlet hole and the liquid outlet hole are communicated with the sealing cavity through the limiting groove. In the structure, the mounting flange is provided with the corresponding flushing holes, and the main seal, the auxiliary seal and the elastic compensation piece are flushed and cooled in time, so that the stability of the sealing performance is ensured.

Preferably, the elastic compensation piece is a spring, and the main static ring seat and the auxiliary static ring seat are respectively provided with a limiting step for the two ends of the spring to abut against. In the structure, the spring is selected as the elastic compensation piece, the structure is simple, the installation is convenient, and the compensation force for the two static ring assemblies is balanced and stable.

The improved structure is characterized in that a mounting boss is arranged on the outer wall of the shaft sleeve near one end of the main seal, a third mounting groove is concavely formed in one end of the mounting boss, and a driving ring is assembled in the third mounting groove to form a driving ring assembly; and a third sealing ring is arranged between the radial outer wall of the driving ring and the inner wall of the third mounting groove, and a third flexible gasket is arranged between the tail end of the driving ring and the bottom of the third mounting groove.

Still further, the auxiliary moving ring assembly comprises an auxiliary moving ring and an auxiliary moving ring seat, the auxiliary moving ring seat is sleeved at the other end of the shaft sleeve, a fourth mounting groove for assembling the auxiliary moving ring is formed in one end of the auxiliary moving ring seat, a fourth sealing ring is assembled between the radial outer wall of the auxiliary moving ring and the inner wall of the fourth mounting groove, and a fourth flexible gasket is assembled between the tail end of the auxiliary moving ring and the bottom of the fourth mounting groove.

The structure and the materials of the main ring, the auxiliary ring, the main static ring and the auxiliary static ring are the same; the main static ring seat and the auxiliary static ring seat have the same structure. In the improved structure, the plurality of parts adopt universal parts with the same structure, thereby facilitating the mass production of the parts and reducing the cost; and the installation does not need special distinction, thus avoiding the wrong installation.

And in addition, a silicon carbide protection plate is assembled on one side of the mounting flange close to the main seal, and a sealing ring is assembled between the inner hole wall of the silicon carbide protection plate and the outer wall of the main stationary ring seat. In the structure, the silicon carbide protection plate is arranged at the medium end of the mounting flange, so that the mounting flange can better cope with pulp scouring, and the service life is ensured.

Still further, a positioning groove is formed in the inner hole wall of the silicon carbide protection plate, the radial outer ring of the sealing ring is matched in the positioning groove, and the inner ring of the sealing ring is matched on the outer side wall of the main static ring seat in a sealing mode. In the improved mechanism, the positioning groove is arranged to enable the installation position of the sealing ring to be more accurate, and in the use process, the sealing ring cannot move in position; and slag particles in the medium can be better prevented from entering a gap between the silicon carbide protection plate and the outer wall of the main static ring seat.

Drawings

FIG. 1 is a schematic illustration in half section of a double-ended mechanical seal of the present utility model applied to a high-concentration pulp apparatus;

FIG. 2 is a schematic view of a mounting flange of the present utility model in semi-section;

FIG. 3 is a front view of a mounting flange of the present utility model;

FIG. 4 is a cross-sectional view of a primary (secondary) stationary ring seat in accordance with the present utility model;

FIG. 5 is a left side view of the primary (secondary) stationary ring seat of FIG. 4;

FIG. 6 is an enlarged view of the structure at X in FIG. 1;

fig. 7 is an enlarged view of the structure at Y in fig. 1.

Reference numerals illustrate:

1. a shaft sleeve; 2. a mounting flange; 3. a limit protrusion; 4. a limit groove; 5. an elastic compensation member; 6. a primary stationary ring; 7. a main stationary ring seat; 8. a first mounting groove; 9. a first seal ring; 10. a first flexible gasket; 11. a first boss; 12. an auxiliary stationary ring; 13. an auxiliary stationary ring seat; 14. a second mounting groove; 15. a second seal ring; 16. a second flexible gasket; 17. sealing the cavity; 18. a liquid inlet hole; 19. a liquid outlet hole; 20. a limit step; 21. a mounting boss; 22. a third mounting groove; 23. a drive ring; 24. a third seal ring; 25. a third flexible gasket; 26. an auxiliary moving ring; 27. an auxiliary moving ring seat; 28. a fourth mounting groove; 29. a fourth seal ring; 30. a fourth flexible gasket; 31. a silicon carbide guard plate; 32. a seal ring; 33. a positioning groove; 34. a set screw; 35. a notch; 36. an anti-rotation pin.

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 double-end-face mechanical seal applied to high-concentration pulp equipment, which comprises a shaft sleeve 1 sleeved outside a rotating shaft of the pulp equipment, wherein the shaft sleeve 1 is in transmission connection with the rotating shaft, and the shaft sleeve 1 synchronously rotates along with the rotating shaft; in addition, a mounting flange 2 is sleeved outside the shaft sleeve 1, and when the mechanical seal is mounted on equipment, the mounting flange 2 is connected with an equipment mounting cavity to serve as a static ring seat; the two ends of the inner cavity of the mounting flange 2 are respectively provided with a main static ring component and an auxiliary static ring component which can slide along the axial direction of the mounting flange, the two ends of the shaft sleeve 1 are respectively provided with a driving ring component and an auxiliary dynamic ring component, wherein the driving ring component is in sealing fit with the main static ring component to form a main seal, and the auxiliary dynamic ring component is in sealing fit with the auxiliary static ring component to form an auxiliary seal; a sealing cavity 17 is formed between the outer side wall of the shaft sleeve 1 and the inner side walls of the driving ring assembly, the main static ring assembly, the auxiliary dynamic ring assembly and the auxiliary static ring assembly; the inner cavity wall of the mounting flange 2 is provided with a limiting protrusion 3, as shown in fig. 3, the main static ring component and/or the auxiliary static ring component is provided with a limiting groove 4 matched with the limiting protrusion 3, and the main static ring component and the auxiliary static ring component are in circumferential limiting fit, namely after one component in the main static ring component and the auxiliary static ring component is in circumferential anti-rotation with the mounting flange 2 in the limiting fit, the other component can also synchronously realize circumferential anti-rotation.

In addition, an elastic compensation piece 5 is arranged between the main static ring assembly and the auxiliary static ring assembly, so that the main static ring assembly and the auxiliary static ring assembly always have the trend of moving towards the main static ring assembly and the auxiliary dynamic ring assembly respectively. In this embodiment, the elastic compensation member 5 is preferably a spring, the spring is sleeved outside the shaft sleeve 1, and two ends of the spring are respectively abutted against the main static ring assembly and the auxiliary static ring assembly.

More specifically, in this embodiment, the primary static ring assembly includes a primary static ring 6 and a primary static ring seat 7, one end of the primary static ring seat 7 is provided with a first mounting groove 8, the primary static ring 6 is assembled in the first mounting groove 8, a first sealing ring 9 is disposed between the circumferential outer wall of the primary static ring 6 and the inner wall of the first mounting groove 8, and a first flexible gasket 10 is disposed between the tail end of the primary static ring 6 and the bottom of the first mounting groove 8; the other end of the main stationary ring seat 7 is provided with two symmetrical first bosses 11, and each first boss 11 is provided with a limiting groove 4.

Similarly, the auxiliary static ring assembly comprises an auxiliary static ring 12 and an auxiliary static ring seat 13, a second mounting groove 14 is formed in one end of the auxiliary static ring seat 13, the auxiliary static ring 12 is assembled in the second mounting groove 14, a second sealing ring 15 is arranged between the circumferential outer wall of the auxiliary static ring 12 and the inner wall of the second mounting groove 14, and a second flexible gasket 16 is arranged between the tail end of the auxiliary static ring 12 and the bottom of the second mounting groove 14; two symmetrical second bosses are arranged at the other end of the auxiliary static ring seat 13, and each second boss is provided with a limiting groove 4; the two second bosses are respectively and limitedly matched between the two first bosses 11 along the circumferential direction so as to realize circumferential rotation-preventing limit matching of the main static ring assembly and the auxiliary static ring assembly, and any one limit groove 4 is matched with the limit protrusion 3.

As shown in fig. 4 and 5, in the above structure, more specifically, the tail end of the main static ring seat 7 or the auxiliary static ring seat 13 is a cylindrical sleeve structure, and two notches 35 are symmetrically formed at the tail end of the sleeve, so that two convex bosses are formed at the end of the sleeve; so when main quiet ring seat 7 and vice quiet ring seat 13 tail end axial grafting, two first bosss 11 on the quiet ring seat of main 7 just fit in two breach 35 on the quiet ring seat of pair 13, two second bosss on the quiet ring seat of pair 13 just fit in two breach 35 on the quiet ring seat of main 7, realize the spacing cooperation of circumference of two parts when realizing the quiet ring seat of main 7 or vice quiet ring seat 13 axial plug-in fit. In this embodiment, the preferred angle α between the two side walls of the first boss 11 and the second boss is 88 °, that is, the angle between the two side walls of each notch 35 is 92 °, which is convenient for the axial insertion and assembly between the boss of the primary static ring seat 7 or the secondary static ring seat 13 and the notch 35, so that an approximately circular housing is formed after the two bosses are matched; and the circumferential limit of the corresponding structure at the tail end of the main static ring seat 7 or the auxiliary static ring seat 13 after the corresponding structure is inserted and assembled can be realized.

In this embodiment, in order to prevent the seal ring 32 from being too hot or media particles accumulating at the seal surface position, the sealing performance and the service life are affected; as shown in fig. 1, a liquid inlet hole 18 and a liquid outlet hole 19 are respectively formed on the side wall of the mounting flange 2, and the liquid inlet hole 18 and the liquid outlet hole 19 are communicated with the sealing cavity 17; more specifically, in this structure, two spacing grooves 4 have all been seted up at main quiet ring seat 7, vice quiet ring seat 13 tail end to be used for with spacing protruding 3 cooperation spacing only need spacing groove 4 can, so when main quiet ring seat 7, vice quiet ring seat 13's tail end along the axial connection cooperation, remaining spacing groove 4 has formed the intercommunicating pore promptly, feed liquor hole 18, play liquid hole 19 all communicate with sealed chamber 17 through this intercommunicating pore, the quick circulation flow of flushing fluid of being convenient for, the washing and the cooling of sealed face.

On the other hand, as shown in fig. 1, in this embodiment, the main stationary ring seat 7 and the auxiliary stationary ring seat 13 are respectively provided with a limiting step 20, and two ends of the spring are respectively abutted against the two limiting steps 20; in the structure, the compensating acting force of the two main static rings 6 and the auxiliary static ring 12 which play a role in compensation in the axial direction is provided by the same spring; therefore, in case of accidents such as cracking of the medium side mechanical seal (main seal), the influence of the large spring compression amount change on the elasticity of the medium side mechanical seal is small, and meanwhile, the sealing ring 32 (auxiliary seal) at the atmosphere end can be used as a single-end-face mechanical seal for emergency, so that large leakage is avoided due to failure of the medium side main seal, and the buffer time is provided for subsequent maintenance.

In addition, as shown in fig. 6, in the above structure, a mounting boss 21 is arranged on the outer wall of one end of the shaft sleeve 1 near the main seal, a third mounting groove 22 is concavely arranged at one end of the mounting boss 21, and a driving ring 23 is assembled in the third mounting groove 22 to form a driving ring assembly; and a third sealing ring 24 is arranged between the radial outer wall of the driving ring 23 and the inner wall of the third mounting groove 22, and a third flexible gasket 25 is arranged between the tail end of the driving ring 23 and the bottom of the third mounting groove 22.

On the other hand, as shown in fig. 7, the auxiliary moving ring assembly comprises an auxiliary moving ring 26 and an auxiliary moving ring seat 27, the auxiliary moving ring seat 27 is sleeved at the other end of the shaft sleeve 1, a plurality of set screws 34 distributed along the circumferential direction are arranged on the side wall of the auxiliary moving ring seat 27 in a penetrating way, and part of each set screw 34 is abutted against the outer wall of the shaft sleeve 1 to realize the transmission connection of the auxiliary moving ring assembly and the shaft sleeve 1; the other part of the set screw 34 passes through the shaft sleeve 1 to be tightly matched with the outer wall of the rotating shaft, so that the shaft sleeve 1 is in transmission connection with the rotating shaft.

One end of the auxiliary moving ring seat 27 is provided with a fourth mounting groove 28 for assembling the auxiliary moving ring 26, a fourth sealing ring 29 is assembled between the radial outer wall of the auxiliary moving ring 26 and the inner wall of the fourth mounting groove 28, and a fourth flexible gasket 30 is assembled between the tail end of the auxiliary moving ring 26 and the bottom of the fourth mounting groove 28. In the embodiment, a floating type matching mechanism is adopted among the driving ring 23, the main static ring 6, the auxiliary dynamic ring 26, the auxiliary static ring 12 and corresponding dynamic ring seats or static ring seats, so that the problems of high overall alloy cost and easy deformation of common hot mounting are avoided, meanwhile, a soft gasket is arranged at the bottom of the dynamic ring and the static ring, and the soft gasket is preferably a tetrafluoroethylene gasket; the problem that the dynamic and static rings are deformed and the mechanical seal fails due to the stress effect on the dynamic and static rings caused by the uneven bottom of the metal seat at 2.5MPa is avoided.

More preferably, in this embodiment, the structures and materials of the driving ring 23, the auxiliary moving ring 26, the main stationary ring 6 and the auxiliary stationary ring 12 are the same; the main static ring seat 7 and the auxiliary static ring seat 13 have the same structure; the device is convenient for mass production of parts, can be used universally during installation, and is not easy to be misplaced.

As shown in fig. 1, a silicon carbide protection plate 31 is arranged on one side of the mounting flange 2 near the main seal, so that the mounting flange 2 can better cope with pulp flushing in the working cavity, and the service life is ensured; in addition, a sealing ring 32 is arranged between the inner hole wall of the silicon carbide protection plate 31 and the outer wall of the main static ring seat 7; the inner hole wall of the silicon carbide protection plate 31 is provided with a positioning groove 33, the radial outer ring of the sealing ring 32 is matched in the positioning groove 33, and the inner ring of the sealing ring 32 is matched on the outer side wall of the main static ring seat 7 in a sealing way. The sealing ring 32 in the structure is a special-shaped sealing ring, unlike a conventional O-shaped sealing ring, a gap is not generated between the sealing ring and the positioning groove 33, and slag particles in a medium are prevented from entering the gap, so that the O-shaped sealing ring is blocked, and compensation is not smooth.

In this embodiment, the main ring 23, the auxiliary ring 26, the main static ring 6 and the auxiliary static ring 12 are made of cobalt-based hard alloy with high hardness, so that they can adapt to the ore pulp containing high-hardness particles.

In addition, as shown in fig. 6 and 7, in the above-described structure, the anti-rotation pins 36 are provided at the bottoms of the first mounting groove 8, the second mounting groove 14, the third mounting groove 22 and the fourth mounting groove 28, and corresponding anti-rotation pin grooves are provided on the respective movable rings or stationary rings.

Although the present disclosure is disclosed above, the scope 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 disclosure.

Claims

1. The double-end-face mechanical seal applied to the high-concentration ore pulp equipment is characterized in that: the device comprises a shaft sleeve (1) and a mounting flange (2) sleeved outside the shaft sleeve (1), wherein a main static ring component and an auxiliary static ring component which can slide along the axial direction of the mounting flange are respectively assembled at two ends of an inner cavity of the mounting flange (2), and the main static ring component and the auxiliary static ring component are in limit fit in the circumferential direction; a driving ring assembly and an auxiliary moving ring assembly are respectively arranged at two ends of the shaft sleeve (1), the driving ring assembly is in sealing fit with the main stationary ring assembly to form a main seal, and the auxiliary moving ring assembly is in sealing fit with the auxiliary stationary ring assembly to form an auxiliary seal; a limiting protrusion (3) is arranged on the inner cavity wall of the mounting flange (2), and a limiting groove (4) matched with the limiting protrusion (3) is arranged on the main static ring assembly and/or the auxiliary static ring assembly; an elastic compensation piece (5) is arranged between the main static ring assembly and the auxiliary static ring assembly, so that the main static ring assembly and the auxiliary static ring assembly always have the trend of moving towards the main static ring assembly and the auxiliary dynamic ring assembly respectively.

2. The double-ended mechanical seal for use in a high-strength pulp mill of claim 1, wherein: the main static ring assembly comprises a main static ring (6) and a main static ring seat (7), a first mounting groove (8) is formed in one end of the main static ring seat (7), the main static ring (6) is assembled in the first mounting groove (8), a first sealing ring (9) is arranged between the circumferential outer wall of the main static ring (6) and the inner wall of the first mounting groove (8), and a first flexible gasket (10) is arranged between the tail end of the main static ring (6) and the bottom of the first mounting groove (8); the other end of the main stationary ring seat (7) is provided with two symmetrical first bosses (11), and each first boss (11) is provided with a limiting groove (4).

3. The double-ended mechanical seal for use in a high-strength pulp mill of claim 2, wherein: the auxiliary static ring assembly comprises an auxiliary static ring (12) and an auxiliary static ring seat (13), a second mounting groove (14) is formed in one end of the auxiliary static ring seat (13), the auxiliary static ring (12) is assembled in the second mounting groove (14), a second sealing ring (15) is arranged between the circumferential outer wall of the auxiliary static ring (12) and the inner wall of the second mounting groove (14), and a second flexible gasket (16) is arranged between the tail end of the auxiliary static ring (12) and the bottom of the second mounting groove (14); two symmetrical second bosses are arranged at the other end of the auxiliary static ring seat (13), and each second boss is provided with a limiting groove (4); the two second bosses are respectively in limit fit between the two first bosses (11) along the circumferential direction, and any one of the limit grooves (4) is matched with the limit protrusions (3).

4. A double-ended mechanical seal for use in a high-strength mineral slurry installation as claimed in claim 3, wherein: a sealing cavity (17) is formed between the outer side wall of the shaft sleeve (1) and the inner side walls of the driving ring assembly, the main static ring assembly, the auxiliary dynamic ring assembly and the auxiliary static ring assembly, a liquid inlet hole (18) and a liquid outlet hole (19) are respectively formed in the side wall of the mounting flange (2), and the liquid inlet hole (18) and the liquid outlet hole (19) are communicated with the sealing cavity (17) through the limiting groove (4).

5. A double-ended mechanical seal for use in a high-strength mineral slurry installation as claimed in claim 3, wherein: the elastic compensation piece (5) is a spring, and limiting steps (20) used for enabling two ends of the spring to be abutted are respectively arranged on the main static ring seat (7) and the auxiliary static ring seat (13).

6. A double-ended mechanical seal for use in a high-strength mineral slurry installation as claimed in claim 3, wherein: a mounting boss (21) is arranged on the outer wall of the shaft sleeve (1) near one end of the main seal, a third mounting groove (22) is concavely formed in one end of the mounting boss (21), and a driving ring (23) is assembled in the third mounting groove (22) to form a driving ring assembly; and a third sealing ring (24) is arranged between the radial outer wall of the driving ring (23) and the inner wall of the third mounting groove (22), and a third flexible gasket (25) is arranged between the tail end of the driving ring (23) and the bottom of the third mounting groove (22).

7. A double-ended mechanical seal for use in a high-strength mineral slurry installation as claimed in claim 3, wherein: the auxiliary moving ring assembly comprises an auxiliary moving ring (26) and an auxiliary moving ring (26) seat, the auxiliary moving ring (26) seat is sleeved at the other end of the shaft sleeve (1), a fourth mounting groove (28) for assembling the auxiliary moving ring (26) is formed in one end of the auxiliary moving ring (26) seat, a fourth sealing ring (29) is assembled between the radial outer wall of the auxiliary moving ring (26) and the inner wall of the fourth mounting groove (28), and a fourth flexible gasket (30) is assembled between the tail end of the auxiliary moving ring (26) and the bottom of the fourth mounting groove (28).

8. The double-ended mechanical seal for use in a high-strength mineral slurry installation of claim 7, wherein: the structure and the material of the main ring (23), the auxiliary ring (26), the main static ring (6) and the auxiliary static ring (12) are the same; the main static ring seat (7) and the auxiliary static ring seat (13) have the same structure.

9. A double-ended mechanical seal for use in a high-strength mineral slurry installation according to any one of claims 2 to 8, wherein: a silicon carbide protection plate (31) is assembled on one side, close to the main seal, of the mounting flange (2), and a sealing ring (32) is assembled between the inner hole wall of the silicon carbide protection plate (31) and the outer wall of the main static ring seat (7).

10. The double-ended mechanical seal for use in a high-strength mineral slurry installation of claim 9, wherein: the silicon carbide guard plate (31) is provided with a positioning groove (33) on the inner hole wall, the radial outer ring of the sealing ring (32) is matched in the positioning groove (33), and the inner ring of the sealing ring (32) is matched on the outer side wall of the main static ring seat (7) in a sealing way.