CN217682436U

CN217682436U - Sealing ring for multi-stage centrifugal pump

Info

Publication number: CN217682436U
Application number: CN202221471719.XU
Authority: CN
Inventors: 李燕; 李文周; 王姣
Original assignee: Shanghai First Pump Works Co ltd
Current assignee: Shanghai First Pump Works Co ltd
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-10-28
Anticipated expiration: 2032-06-14

Abstract

The utility model relates to a centrifugal pump technical field provides a sealing ring for multistage centrifugal pump, including boss and convex shoulder, set up thin tooth external screw thread on the excircle of convex shoulder, set up the dismouting groove on the boss, set up corresponding thin tooth internal thread in the centrifugal pump casing, convex shoulder and centrifugal pump casing are through thin tooth external screw thread and thin tooth interior screw-thread fit. The utility model discloses a screw-thread fit connects, makes difficult not hard up droing under the frictional condition of sealing ring and impeller, when having prolonged sealing ring life, avoids damaging pump equipment, safe and reliable, and sealing ring easy dismounting is swift moreover.

Description

Sealing ring for multi-stage centrifugal pump

Technical Field

The utility model relates to a centrifugal pump technical field especially relates to a sealing ring for multistage centrifugal pump.

Background

The sealing ring is a quick-wear part of the multistage centrifugal pump, plays a role in protecting shells such as a water inlet section, a middle section and a water outlet section, prevents the abrasion of large parts, is matched with a rotating part such as an impeller and the like for use, and plays a role in sealing, supporting and balancing axial force or throttling through a small gap between the sealing ring and the rotating part. Traditional sealing ring and the section of intaking, the middle section, go out and fix through little screw or spot welding between the casing such as the water section, but the multistage centrifugal pump is when the operation, because the multistage centrifugal pump shaft is the flexible axle, sealing ring and impeller contact friction phenomenon easily appear, for example solid particle gets into the sealing ring and seals the face, when contact friction is enough big, the impeller can drive the sealing ring and rotate together, further the sealing ring is not hard up, the screw fracture, phenomenons such as the solder joint drops, thereby lead to the sealing ring to deviate from the condition, destroy pump equipment.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a sealing ring for a multistage centrifugal pump, the sealing ring and the shells such as the water inlet section and the middle section have a shear resistance which is much larger than the mode of screw fixation and spot welding fixation, so that the sealing ring is not easy to loosen and fall off under the condition of ensuring the friction between the sealing ring and an impeller, the service life of the sealing ring is prolonged, and the pump equipment is prevented from being damaged, and the sealing ring is safe and reliable; and the sealing ring is convenient and quick to disassemble and assemble.

In order to solve the problem, the utility model provides a sealing ring for multistage centrifugal pump, characterized by, including boss and convex shoulder, set up thin tooth external screw thread on the excircle of convex shoulder, set up the dismouting groove on the boss, set up the thin tooth internal thread that corresponds in the centrifugal pump casing, convex shoulder and centrifugal pump casing pass through thin tooth external screw thread and thin tooth interior screw-thread fit.

Furthermore, a tool withdrawal groove is arranged between the fine thread external thread of the convex shoulder and the boss.

Furthermore, the number of the assembling and disassembling grooves on the boss is 4-10.

Further, the section of the assembling groove is square or U-shaped.

Further, the thickness of the sealing ring matches the thickness of the centrifugal pump housing.

The utility model has the advantages of, adopt screw-thread fit between the casing such as sealing ring and the section of intaking, middle section, its anti-shearing ability that can bear is a lot bigger than the fixed mode of fix with screw and spot welding, ensures to make under the frictional condition of sealing ring and impeller, and the sealing ring is difficult not hard up to drop, when having prolonged sealing ring life, avoids damaging pump equipment, safe and reliable, this structure also is applicable to parts similar to the sealing ring structure such as guide vane cover and throttle cover for multistage centrifugal pump simultaneously.

Drawings

Fig. 1 is a schematic front view of a seal ring for a multistage centrifugal pump according to the present invention;

FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1

Fig. 3 shows a schematic view of the mounting of the sealing ring to the housing of the centrifugal pump.

Reference numerals:

10. a seal ring;

11. fine external threads;

12. disassembling and assembling the groove;

13. a boss;

14. a tool withdrawal groove;

15. a mating end face;

20. a centrifugal pump housing;

21. fine internal threads;

22. a spigot section;

23. and (4) shoulder forming.

Detailed Description

The following describes in detail a sealing ring for a multistage centrifugal pump according to an embodiment of the present invention with reference to the accompanying drawings.

Referring to fig. 1 and 2, the sealing ring for a multistage centrifugal pump of the present invention includes a boss 13 and a shoulder 23, and is installed in the water inlet section or the middle section of the centrifugal pump. The thickness of the sealing ring is equivalent to the thickness of a shell of a water inlet section or a middle section inlet of the centrifugal pump.

The convex shoulder of the sealing ring 10 is matched with the centrifugal pump shell 20, the external circle of the convex shoulder 23 is provided with a fine thread external thread 11, and the matching part of the centrifugal pump shell 20 is provided with a fine thread internal thread 21 with the same specification; the outer circle of the boss of the sealing ring is provided with a dismounting groove 12, and the dismounting groove 12 is of a square structure. A tool withdrawal groove 14 is arranged between the fine thread 11 of the convex shoulder 23 and the convex platform 13, and the number of the dismounting grooves 12 of the sealing ring 10 is 4-10.

Referring to fig. 3, during installation, the fine thread external thread 11 of the sealing ring 10 is screwed into the fine thread internal thread 21 of the shell 20, and a wrench is used for clamping the dismounting groove 12 to drive the sealing ring 10 until the matching end surface 15 of the sealing ring 10 is attached to the spigot end surface 22 of the centrifugal pump shell 20; when the sealing ring is disassembled, a wrench is used for clamping the disassembling groove 12 to drive the sealing ring 10 until the sealing ring 10 is separated.

The utility model has the advantages of, adopt screw-thread fit between the casing such as sealing ring and the section of intaking, middle section, its anti-shearing ability that can bear is a lot more than the mode that fix with screw and spot welding are fixed, ensures to make under the frictional condition of sealing ring and impeller, and the sealing ring is difficult not hard up to drop, when having prolonged sealing ring life, avoids damaging pump equipment, safe and reliable, and sealing ring easy dismounting is swift moreover. The structure is also suitable for parts similar to sealing ring structures, such as guide vane sleeves, throttling sleeves and the like for the multistage centrifugal pump.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a sealing ring for multistage centrifugal pump, a serial communication port, includes boss and convex shoulder, set up thin tooth external screw thread on the excircle of convex shoulder, set up the dismouting groove on the boss, set up the thin tooth internal thread that corresponds in the casing of centrifugal pump, convex shoulder and centrifugal pump casing pass through thin tooth external screw thread and thin tooth internal thread cooperation.

2. The seal ring for a multistage centrifugal pump according to claim 1, wherein a relief groove is provided between the fine-pitch external thread of the shoulder and the boss.

3. The seal ring for a multistage centrifugal pump according to claim 1 or 2, wherein the number of the disassembly grooves on the boss is 4 to 10.

4. The seal ring for a multistage centrifugal pump according to claim 3, wherein the cross-section of the disassembly groove is square or U-shaped.

5. A sealing ring for a multistage centrifugal pump according to claim 3, wherein the thickness of the sealing ring matches the thickness of the centrifugal pump housing.