CN211039137U

CN211039137U - Sealing structure for horizontal centrifugal pump

Info

Publication number: CN211039137U
Application number: CN201921780656.4U
Authority: CN
Inventors: 吴明亮
Original assignee: Wuxi Aibide Pump Industry Co ltd
Current assignee: Wuxi Aibide Pump Industry Co ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-07-17
Anticipated expiration: 2029-10-22

Abstract

The utility model relates to a sealing structure for a horizontal centrifugal pump, which comprises a pump shaft, a pump body and a machine sealing cavity body positioned at the rear end of the pump body; the rear end of the mechanical seal cavity is fixedly provided with an mechanical seal cover; the sealing structure is arranged between the mechanical seal gland and the pump shaft; the sealing structure comprises a back seal and a labyrinth structure; the labyrinth structure is positioned between the mechanical seal gland and the pump shaft; the sawtooth structure of the labyrinth structure is tightly attached to the pump shaft; the back seal is mounted between the pump shaft and the mechanical seal gland around the pump shaft. Due to the application of the back seal and the labyrinth structure, when the mechanical seal of the centrifugal pump is damaged in operation, the mechanical seal can be maintained at any time in use, no strict requirement is required for the maintenance time of the pump, and the operation of a user and a manufacturer is facilitated.

Description

Sealing structure for horizontal centrifugal pump

Technical Field

The utility model relates to a centrifugal pump field, concretely relates to a seal structure for horizontal centrifugal pump.

Background

Most SBS horizontal centrifugal pumps use single-end-face mechanical seals, when the pump is used on site, if the mechanical seals are damaged, the condition of leakage of pump media can be generated, and when the pump media are leaked, the quantity of the media is large, the flow rate is high, and the site environment is seriously influenced. Great inconvenience is brought to users, high requirements are also put forward on the maintenance time period of the pump seal, and great troubles are brought to after-sales service of the pump.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model discloses a seal structure for horizontal centrifugal pump.

The utility model discloses the technical scheme who adopts as follows:

a sealing structure for a horizontal centrifugal pump comprises a pump shaft, a pump body and a machine seal cavity body positioned at the rear end of the pump body; the rear end of the mechanical seal cavity is fixedly provided with an mechanical seal cover; the sealing structure is arranged between the mechanical seal gland and the pump shaft; the sealing structure comprises a back seal and a labyrinth structure; the labyrinth structure is positioned between the mechanical seal gland and the pump shaft; the sawtooth structure of the labyrinth structure is tightly attached to the pump shaft; the back seal is mounted between the pump shaft and the mechanical seal gland around the pump shaft.

The further technical scheme is as follows: and a single-end-face mechanical seal is arranged between the mechanical seal cavity and the mechanical seal gland and surrounds the pump shaft.

The further technical scheme is as follows: the back seal is located between the single ended machine seal and the labyrinth arrangement.

The further technical scheme is as follows: the centrifugal pump further comprises an impeller; the impeller is positioned in the pump body and fixed at one end of the pump shaft.

The further technical scheme is as follows: the centrifugal pump also comprises a bracket fixed at the rear end of the pump body; the mechanical seal cavity is fixed on the bracket; a bearing chamber is fixed at the rear end of the bracket; a bearing is arranged in the bearing chamber; the pump shaft is mounted in the bearing.

The further technical scheme is as follows: a flushing pipe is arranged on the mechanical seal gland; and flushing liquid introduced by the flushing pipe enters between the mechanical seal cavity and the mechanical seal gland.

The further technical scheme is as follows: an annular structure with one end parallel to the axis of the pump shaft extends out of the rear end of the mechanical seal gland, and a labyrinth structure is positioned between the annular structure and the pump shaft; the sawtooth structure of the labyrinth structure faces the direction of the pump shaft and is tightly attached to the pump shaft.

The beneficial effects of utility model are as follows:

1. the utility model provides a centrifugal force and axial resistance that back of the body sealed can produce at rotatory in-process, form the obstacle to revealing of single-ended machine seal, delayed the machine seal and revealed the velocity of flow.

2. The utility model discloses the labyrinth structure of well machine gland lid plays the obstacle of revealing on second floor, further delays the velocity of flow that the machine sealed intracavity medium was revealed.

3. The utility model provides a back is sealed and the pump shaft is zero clearance fit, and the leakage point along the pump shaft clearance with the machine seal reduces.

The structure of the utility model is particularly suitable for the SBS horizontal centrifugal pump. The SBS horizontal centrifugal pump is a water pump model. The single-end-face mechanical seal of the SBS horizontal centrifugal pump has the advantages that due to the application of the back seal and the labyrinth structure, when the mechanical seal is in actual use on site, if the mechanical seal is damaged during operation, the leakage speed of a pump medium can be greatly reduced, the strict requirement on the maintenance time of the pump is avoided, and the SBS horizontal centrifugal pump is win-win for pump users and manufacturers.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

In the figure: 1. a pump body; 2. an impeller; 3. a machine seal cavity; 4. a bracket; 5. a bearing chamber; 6. a deep groove ball bearing; 7. a pump shaft; 8. single-end face machine sealing; 9. back sealing; 10. a mechanical seal gland; 11. and (4) flushing the pipe.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

Fig. 1 is a schematic structural diagram of the present invention. As shown in fig. 1, the centrifugal pump of the horizontal type includes a pump body 1. The rear end of the pump body 1 is fixed with a bracket 4. Specifically, the bracket 4 may be fixed to the rear end of the pump body 1 using screws. The impeller 2 is located in the pump body 1. An organic enclosure 3 is fixed on the bracket 4. The rear end of the mechanical seal cavity 3 is fixed with an organic seal cover 10. The space surrounded by the mechanical seal gland 10 and the mechanical seal cavity 3 is a mechanical seal cavity.

The rear end of the bracket 4 is fixed with a bearing chamber 5. A bearing 6 is installed in the bearing chamber 5. In the present embodiment, the bearing 6 is a deep groove ball bearing. The pump shaft 7 is mounted in a bearing 6. After the pump shaft 7 sequentially passes through the bearing chamber 5, the bracket 4, the mechanical seal gland 10 and the mechanical seal cavity 3, the impeller 2 is fixed at one end of the pump shaft 7. The pump shaft 7 rotates in the bearing 6 and carries the impeller 2 in rotation.

The horizontal centrifugal pump also comprises a flushing pipe 11 which is communicated with the mechanical seal cavity between the mechanical seal cavity 3 and the mechanical seal pressing cover 10 through one end of the flushing pipe 11, and the flushing pipe 11 is used for introducing cooling water to take away heat. And a single-end mechanical seal 8 is arranged between the mechanical seal gland 10 and the pump shaft 7 and surrounds the pump shaft 7. Fig. 2 is an enlarged view of a portion a in fig. 1. As shown in fig. 2, the single-ended mechanical seal 8 is used to prevent leakage of the water pump delivery medium in the mechanical seal cavity. And a sealing structure is also arranged between the machine sealing cover 10 and the pump shaft 7. The sealing structure comprises a back seal 9 and a labyrinth structure. Specifically, an annular structure with one end parallel to the axis of the pump shaft 7 extends from the rear end of the mechanical seal gland 10, the labyrinth structure is located between the annular structure and the pump shaft 7, and the sawtooth structure of the labyrinth structure faces the direction of the pump shaft 7 and is tightly attached to the pump shaft 7. The back seal 9 is mounted around the pump shaft 7 between the pump shaft 7 and the mechanical seal gland 10. And a back seal 9 is located between the labyrinth arrangement and the single ended mechanical seal 8.

The back seal 9 is fixed to the pump shaft 7 and embraces the pump shaft 7. The back seal 9 generates centrifugal force and axial resistance in rotation to form an obstacle to leakage of the single-end face mechanical seal 8, and the medium leakage flow rate in the mechanical seal cavity 3 is delayed. Meanwhile, the labyrinth structure at the rear end of the mechanical seal gland 10 plays a role of a second layer of leakage obstacle, and further delays the medium leakage flow rate in the mechanical seal cavity 3. The back seal 9 and the pump shaft 7 are in gapless fit, and leakage points of the mechanical seal cavity 3 along the gaps of the pump shaft 7 are reduced.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made without departing from the basic structure of the invention.

Claims

1. A kind of seal structure used for horizontal centrifugal pump, characterized by that: the centrifugal pump comprises a pump shaft (7), a pump body (1) and a machine seal cavity (3) positioned at the rear end of the pump body (1); the rear end of the mechanical seal cavity body (3) is fixedly provided with an organic seal cover (10); the sealing structure is arranged between the mechanical seal gland (10) and the pump shaft (7); the sealing structure comprises a back seal (9) and a labyrinth structure; the labyrinth structure is positioned between the mechanical seal gland (10) and the pump shaft (7); the sawtooth structure of the labyrinth structure is tightly attached to the pump shaft (7); the back seal (9) is arranged between the pump shaft (7) and the mechanical seal gland (10) around the pump shaft (7).

2. The seal structure for a horizontal centrifugal pump according to claim 1, wherein: and a single-end-face mechanical seal (8) is arranged between the mechanical seal cavity (3) and the mechanical seal gland (10) and surrounds the pump shaft (7).

3. The seal structure for a horizontal centrifugal pump according to claim 2, wherein: the back seal (9) is located between the single-ended mechanical seal (8) and the labyrinth arrangement.

4. The seal structure for a horizontal centrifugal pump according to claim 1, wherein: the centrifugal pump further comprises an impeller (2); the impeller (2) is positioned in the pump body (1) and is fixed at one end of the pump shaft (7).

5. The seal structure for a horizontal centrifugal pump according to claim 1, wherein: the centrifugal pump also comprises a bracket (4) fixed at the rear end of the pump body (1); the mechanical seal cavity (3) is fixed on the bracket (4); a bearing chamber (5) is fixed at the rear end of the bracket (4); a bearing (6) is arranged in the bearing chamber (5); the pump shaft (7) is mounted in the bearing (6).

6. The seal structure for a horizontal centrifugal pump according to claim 1, wherein: a flushing pipe (11) is arranged on the mechanical seal gland (10); flushing liquid introduced by the flushing pipe (11) enters between the mechanical seal cavity (3) and the mechanical seal pressing cover (10).

7. The seal structure for a horizontal centrifugal pump according to claim 1, wherein: an annular structure with one end parallel to the axis of the pump shaft (7) extends out of the rear end of the mechanical seal gland (10), and a labyrinth structure is positioned between the annular structure and the pump shaft (7); the sawtooth structure of the labyrinth structure faces the direction of the pump shaft (7) and is tightly attached to the pump shaft (7).