Built-in mechanical seal

Abstract

The built-in mechanical seal comprises a sealing box, a static ring is arranged in the front end of the sealing box, the front end of the static ring is tightly attached to a movable ring, the movable ring is arranged at a groove in the rear end of an impeller, the rear end of the static ring is arranged on a static ring base, and a material blocking ring is arranged between the static ring and an opening in the front end of the sealing box. A water seal seat is arranged at the position of a step inside the rear end of the sealing box, a water seal ring combination is arranged in a groove in the rear end of the water seal seat and arranged on the shaft sleeve, a clamping spring is embedded in the portion, located on one side of the water seal seat, of the sealing box, and a spring assembly is arranged between the water seal seat and the static ring seat. And a water seal cavity is formed among the water seal ring combination, the water seal seat, the static ring seat, the static ring, the moving ring and the shaft sleeve. The sealing device is simple and compact in structure and small in occupied space, the static ring, the static ring seat, the water seal seat and the water seal ring are combined and integrated in the sealing box, installation is convenient, and sealing is more reliable under the high-pressure working condition by combining the water seal design.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field especially relates to a built-in mechanical seal. BACKGROUND

[0002] Mechanical seal is an important fluid sealing device, is widely used in various mechanical equipment, through accurate geometric design and material selection, realizes the close adhesion of sealing surface, effectively prevents fluid leakage. The prior art built-in mechanical seal structure is complex, and installation is inconvenient, and more O type rings need to be used to ensure that the sealing reaches the requirement, and the size precision and surface finish of the O type ring have important influence on its sealing performance, if the size of the O type ring is not accurate or the surface is rough, the sealing failure can be caused, and the large number of used O type rings can increase the risk of sealing failure. SUMMARY

[0003] The utility model aims at solving above-mentioned technical problem, provides a built-in mechanical seal that structure is simple, reliable performance.

[0004] In order to realize above-mentioned technical purpose, reach above-mentioned technical requirement, the utility model adopts the technical scheme that a built-in mechanical seal, including seal box, the seal box is arranged at pump cover one side, the seal box front end inside is provided with static ring, the static ring front end is closely combined with dynamic ring, the dynamic ring is arranged at the recess at the rear end of impeller, the static ring rear end is arranged on static ring seat, the static ring is provided with the baffle ring between the seal box front end opening, the seal box rear end inside step is provided with water seal seat, the water seal seat rear end recess is provided with water seal ring combination, the water seal ring combination is arranged on the shaft sleeve, the seal box inside located water seal seat one side is embedded with the snap spring, the water seal seat is provided with spring assembly between static ring seat, the water seal ring combination, water seal seat, static ring seat, static ring, dynamic ring and the shaft sleeve form water seal cavity.

[0005] Preferably, the spring assembly includes a plurality of springs uniformly distributed in the circumferential direction, one end of the spring is arranged on the water seal seat, and the other end is arranged on the static ring seat.

[0006] Preferably, the water seal O type ring is arranged between the water seal seat and the seal box, the static ring O type ring is arranged between the static ring and the seal box, and the dynamic ring O type ring is arranged between the dynamic ring and the impeller.

[0007] Preferably, the seal box is provided with a threaded hole and is threadedly connected with an external cooling water nozzle.

[0008] Preferably, the inner surface of the seal box is provided with an annular boss, and the outer circle of the static ring is in contact with the inner circle of the annular boss.

[0009] Preferably, the front end of the static ring seat is provided with an axial positioning boss, the rear end of the static ring is provided with an annular groove, and the static ring is positioned by cooperation of the axial positioning boss and the annular groove.

[0010] Compared with the traditional structure, the utility model has the advantages of simple and compact structure, small space occupation, convenient installation, no jamming phenomenon even when conveying high-concentration slurry, more reliable sealing under high-pressure working condition, uniform distribution of a plurality of springs, balanced force on the sealing end face, saving of axial space, less number of sealing rings, small error and reduced risk of mechanical seal failure. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic view of the utility model;

[0012] In the drawing: 1. impeller, 2. pump cover, 3. dynamic ring O-shaped ring, 4. material blocking ring, 5. static ring seat, 6. spring, 7. sealing box, 8. water seal seat, 9. water seal ring combination, 10. dynamic ring, 11. static ring, 12. shaft sleeve, 13. static ring O-shaped ring, 14. water seal O-shaped ring, 15. clamping spring, 16. external cooling water nozzle, 17. pump shaft. DETAILED DESCRIPTION

[0013] The utility model will be further explained below.

[0014] Referring to the accompanying Figure 1 A built-in mechanical seal, comprising a sealing box 7, the sealing box 7 is arranged at one side of pump cover 2, the static ring 11 is arranged in the front end inside of sealing box 7, the front end of static ring 11 is tightly attached to dynamic ring 10, dynamic ring 10 is arranged at the rear end groove of impeller 1, the rear end of static ring 11 is arranged on static ring seat 5, the material blocking ring 4 is arranged between the front end opening of sealing box 7 and static ring 11, the water seal seat 8 is arranged at the rear end inside step of sealing box 7, the water seal ring combination 9 is arranged in the rear end groove of water seal seat 8, the water seal ring combination 9 is arranged on shaft sleeve 12, the clamping spring 15 is embedded in the inside of sealing box 7 at the side of water seal seat 8, the spring assembly is arranged between water seal seat 8 and static ring seat 5, and the water seal cavity is formed between water seal ring combination 9, water seal seat 8, static ring seat 5, static ring 11, dynamic ring 10 and shaft sleeve 12.

[0015] In the preferred embodiment, the spring assembly comprises a plurality of springs 6 evenly distributed in the circumferential direction, one end of the spring 6 is arranged on the water seal seat 8, and the other end is arranged on the static ring seat 5.

[0016] In the preferred embodiment, the water seal seat 8 is provided with a water seal O-ring 14 between the water seal seat 8 and the seal box 7, the static ring 11 is provided with a static ring O-ring 13 between the static ring 11 and the seal box 7, and the dynamic ring 10 is provided with a dynamic ring O-ring 3 between the dynamic ring 10 and the impeller 1.

[0017] In the preferred embodiment, the seal box 7 is provided with threaded holes and externally connected cooling water nozzles 16 are screwed into the threaded holes, and the two externally connected cooling water nozzles 16 are distributed at a horizontal angle.

[0018] In the preferred embodiment, the seal box 7 is provided with an annular boss on the inner surface, and the outer circle of the static ring 11 is in contact with the inner circle of the annular boss.

[0019] In the preferred embodiment, the static ring seat 5 is provided with an axial positioning boss at the front end, the static ring 11 is provided with an annular groove at the rear end, and the static ring 11 and the static ring seat 5 are positioned by the axial positioning boss and the annular groove.

[0020] In specific implementation, the utility model is suitable for high-pressure, dangerous medium or solid particle-containing working conditions, and has good sealing performance. The static ring 11, the static ring seat 5, the water seal seat 8 and the water seal ring combination 9 are integrated in the seal box, so that the structure is compact, the space occupation is small, and installation is convenient. The cooling water enters the water seal cavity through one of the externally connected cooling water nozzles 16 and flows out from the other externally connected cooling water nozzle 16, thereby playing the roles of isolation, lubrication, cooling and medium leakage prevention; even if high-concentration slurry is transported, the phenomenon of jamming does not occur due to the arrangement of the material blocking ring; the uniform distribution of multiple springs ensures that the sealing end face is balanced in force, thereby saving axial space; only three sealing rings are needed to meet the sealing requirement, the number of sealing rings used is small, the error is small, and the risk of mechanical seal failure is reduced.

[0021] The above embodiments of the utility model are merely illustrative, but are not used to limit the protection scope of the utility model, and all equivalent technical solutions also belong to the scope of the utility model. The patent protection scope of the utility model should be defined by the claims.

Claims

1. A mechanical seal of the canned type, characterized in that: The application relates to a sealing device for a pump, which comprises a sealing box (7) arranged on one side of a pump cover (2), a static ring (11) arranged in the front end of the sealing box (7), a dynamic ring (10) tightly combined with the front end of the static ring (11) and arranged in a groove at the rear end of an impeller (1), the rear end of the static ring (11) being arranged on a static ring seat (5), a material blocking ring (4) arranged between the static ring (11) and the opening in the front end of the sealing box (7), a water seal seat (8) arranged at the step in the rear end of the sealing box (7), a water seal ring assembly (9) arranged in a groove in the rear end of the water seal seat (8), the water seal ring assembly (9) being arranged on a shaft sleeve (12), a clamping spring (15) arranged in the sealing box (7) on one side of the water seal seat (8), a spring assembly arranged between the water seal seat (8) and the static ring seat (5), and a water seal cavity formed between the water seal ring assembly (9), the water seal seat (8), the static ring seat (5), the static ring (11), the dynamic ring (10) and the shaft sleeve (12).

2. The mechanical seal of claim 1, wherein: The spring assembly comprises a plurality of springs (6) uniformly distributed in the circumferential direction, one end of each spring (6) being arranged on the water seal seat (8) and the other end being arranged on the static ring seat (5).

3. The built-in mechanical seal of claim 1, wherein: A water seal O-shaped ring (14) is arranged between the water seal seat (8) and the sealing box (7), a static ring O-shaped ring (13) is arranged between the static ring (11) and the sealing box (7), and a dynamic ring O-shaped ring (3) is arranged between the dynamic ring (10) and the impeller (1).

4. The built-in mechanical seal of claim 1, wherein: Threaded holes are arranged on the sealing box (7) and are threadedly connected with external cooling water nozzles (16).

5. The built-in mechanical seal of claim 1, wherein: An annular boss is arranged on the inner surface of the sealing box (7), and the outer circle of the static ring (11) is in contact with the inner circle of the annular boss.

6. The built-in mechanical seal of claim 1, wherein: An axial positioning boss is arranged at the front end of the static ring seat (5), an annular groove is arranged at the rear end of the static ring (11), and the static ring (11) and the static ring seat (5) are positioned by cooperation of the axial positioning boss and the annular groove.

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