CN215672846U - Reverse suction section pressure relief sealing structure of self-balancing multistage centrifugal pump - Google Patents
Reverse suction section pressure relief sealing structure of self-balancing multistage centrifugal pump Download PDFInfo
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- CN215672846U CN215672846U CN202122259732.0U CN202122259732U CN215672846U CN 215672846 U CN215672846 U CN 215672846U CN 202122259732 U CN202122259732 U CN 202122259732U CN 215672846 U CN215672846 U CN 215672846U
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Abstract
The utility model provides a pressure relief sealing structure for a reverse suction section of a self-balancing multistage centrifugal pump, wherein a stepped throttling shaft sleeve (2) is installed on a pump shaft (1), an L-shaped throttling bush (3) is fixedly installed in an inner hole of the reverse suction section (10) through a set screw (4), a semi-open impeller (5) is installed on the pump shaft (1), the left end face of the semi-open impeller (5) is in contact with the right end face of the stepped throttling shaft sleeve (2), a sealing shaft sleeve (6) is installed on the pump shaft (1), the left end face of the sealing shaft sleeve (6) is in contact with the right end face of the semi-open impeller (5), a packing box body (9) is fixedly installed at the right end face of the reverse suction section (10) through a bolt, and a graphite packing seal (8) is installed in a sealing cavity formed between the packing box body (9) and the sealing shaft sleeve (6). The structure improves the sealing performance of the back suction section and reduces the erosion and wear speed of the graphite packing seal.
Description
Technical Field
The utility model relates to the technical field of self-balancing multistage centrifugal pumps, in particular to a pressure relief sealing structure of a reverse suction section of a self-balancing multistage centrifugal pump.
Background
The self-balancing multistage centrifugal pump mainly comprises a water inlet section, a middle section, a water outlet section, a secondary water inlet section, a positive guide vane, a negative guide vane, a positive impeller, a negative impeller, a pump shaft, a throttling part, a retaining sleeve, a transition pipe, a bearing body and other parts. In the operation process of the self-balancing multistage centrifugal pump, the pump shaft is driven by the motor to rotate to do work on the conveyed fluid, so that the energy of the conveyed fluid is increased, and the required amount of fluid is continuously sent out from the suction pool through the water inlets of the water inlet section, the positive impeller, the positive guide vane, the middle section and the water outlet section of the pump, the horizontal water outlets of the transition pipe, the reverse suction section, the reverse impeller, the reverse guide vane and the water outlet section of the pump.
According to the working principle of the self-balancing multistage centrifugal pump, a fluid medium enters a reverse suction section through a transition pipe after passing through the pressurization and speed increase of two or more positive impellers, and then enters a drainage pipeline system through a water outlet section after passing through the pressurization and speed increase of two or more negative impellers, so that the fluid medium in the reverse suction section is in a high-pressure and high-speed state in the operation process of the pump. The tail end of a reverse suction section of the current self-balancing multistage centrifugal pump is usually sealed by a graphite packing, and a sealing bush and a sealing shaft sleeve are arranged between the reverse suction section and a pump shaft. When fluid medium in a high-pressure and high-speed state entering the reverse suction section passes through a sealing gap between the sealing bush and the sealing shaft sleeve, a jet effect is easily generated, the graphite packing at the tail end of the reverse suction section is directly washed, and the service life of the graphite packing seal is seriously influenced.
In view of this, in order to improve the throttling sealing performance of the back suction section of the self-balancing multistage centrifugal pump and reduce the erosion wear of the graphite packing seal caused by the fluid medium, a pressure relief sealing structure suitable for the back suction section of the self-balancing multistage centrifugal pump is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects and aims to provide a pressure relief sealing structure for a reverse suction section of a self-balancing multistage centrifugal pump, and the sealing performance of the reverse suction section of the self-balancing multistage centrifugal pump is improved and the erosion wear rate of graphite packing seal is reduced by a combined sealing form of a semi-open impeller and a stepped throttling sealing structure.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: the pressure relief and sealing structure for the reverse suction section of the self-balancing multistage centrifugal pump comprises a pump shaft, a stepped throttling shaft sleeve, an L-shaped throttling bush, a reverse suction section, a semi-open impeller, a sealing shaft sleeve, a packing box body, a graphite packing seal and a packing gland, wherein the pump shaft is arranged in an inner hole of the reverse suction section, the stepped throttle shaft sleeve is arranged on the pump shaft, the L-shaped throttle bush is fixedly arranged in an inner hole of the reverse suction section through a screw, the semi-open impeller is installed on the pump shaft and the left end face of the semi-open impeller contacts with the right end face of the stepped throttling shaft sleeve, the sealing shaft sleeve is installed on the pump shaft and the left end face of the sealing shaft sleeve contacts with the right end face of the semi-open impeller, the stuffing box body is fixedly installed at the right end face of the reverse suction section through bolts, the graphite packing is installed in a sealing cavity formed between the stuffing box body and the sealing shaft sleeve in a sealing mode, and the packing gland is installed at the right end face of the sealing cavity of the stuffing box body.
The semi-open impeller, the stepped throttling shaft sleeve and the sealing shaft sleeve share a common flat key to be arranged on the pump shaft.
The diameter of the hub of the semi-open impeller is equal to the diameter of the outer circle of the stepped throttling shaft sleeve, and the maximum diameter of the outer circle of the semi-open impeller is three times of the diameter of the outer circle of the stepped throttling shaft sleeve.
The reverse suction section pressure relief sealing structure of the self-balancing multistage centrifugal pump is characterized in that in the operation process of the self-balancing multistage centrifugal pump, a high-speed and high-pressure fluid medium entering a reverse suction section inner cavity from a transition section passes through a sealing gap between a stepped throttling shaft sleeve and an L-shaped throttling bush, and enters an inner cavity between a reverse suction section and a stuffing box body along the radial direction of a semi-open impeller under the rotation action of the semi-open impeller, so that the erosion abrasion of the fluid medium directly sealing a graphite packing after passing through the sealing gap between the stepped throttling shaft sleeve and the L-shaped throttling bush is reduced, the sealing performance of the graphite packing is improved, and the service life is prolonged.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a front view of the semi-open impeller of the present invention.
Labeled as: 1: a pump shaft; 2: a stepped throttle shaft sleeve; 3: an L-shaped throttling bush; 4: tightening the screw; 5: a semi-open impeller; 6: sealing the shaft sleeve; 7: a packing gland; 8: sealing the graphite packing; 9: a stuffing box; 10: a reverse suction section.
Detailed Description
An embodiment of the present invention is further described below with reference to fig. 1 and 2:
the reverse suction section pressure relief sealing structure of the self-balancing multistage centrifugal pump comprises a pump shaft 1, a stepped throttling shaft sleeve 2, an L-shaped throttling bush 3, a reverse suction section 10, a semi-open impeller 5, a sealing shaft sleeve 6, a stuffing box body 9, a graphite packing seal 8 and a packing gland 7, wherein the pump shaft 1 is arranged in an inner hole of the reverse suction section 10, the stepped throttling shaft sleeve 2 is arranged on the pump shaft 1, the L-shaped throttling bush 3 is fixedly arranged in the inner hole of the reverse suction section 10 through a set screw 4, the semi-open impeller 5 is arranged on the pump shaft 1, the left end surface of the semi-open impeller 5 is contacted with the right end surface of the stepped throttling shaft sleeve 2, the sealing shaft sleeve 6 is arranged on the pump shaft 1, the left end surface of the sealing shaft sleeve 6 is contacted with the right end surface of the semi-open impeller 5, the stuffing box body 9 is fixedly arranged at the right end surface of the reverse suction section 10 through a bolt, the graphite packing seal 8 is arranged in a sealing cavity formed between the stuffing box body 9 and the sealing shaft sleeve 6, the packing gland 7 is arranged at the right end face of the sealing cavity of the packing box body 9.
The semi-open impeller 5, the stepped throttling shaft sleeve 2 and the sealing shaft sleeve 6 share a common flat key and are arranged on the pump shaft 1.
The diameter of the hub of the semi-open impeller 5 is equal to the diameter of the outer circle of the stepped throttling shaft sleeve 2, and the maximum diameter of the outer circle of the semi-open impeller 5 is three times of the diameter of the outer circle of the stepped throttling shaft sleeve 2.
The reverse suction section pressure relief sealing structure of the self-balancing multistage centrifugal pump is characterized in that in the operation process of the self-balancing multistage centrifugal pump, a high-speed and high-pressure fluid medium entering the inner cavity of the reverse suction section 10 from the transition section passes through a sealing gap between the stepped throttling shaft sleeve 2 and the L-shaped throttling bush 3, and enters the inner cavity between the reverse suction section 10 and the packing box body 9 along the radial direction of the semi-open impeller 5 under the rotation action of the semi-open impeller 5, so that the direct erosion abrasion of the fluid medium on the graphite packing seal 8 after passing through the sealing gap between the stepped throttling shaft sleeve 2 and the L-shaped throttling bush 3 is reduced, the sealing performance of the graphite packing seal 8 is improved, and the service life is prolonged.
Claims (3)
1. Self-balancing multistage centrifugal pump's anti-section pressure release seal structure of inhaling, including pump shaft (1), cascaded throttle bush (2), L type throttle bush (3), anti-section of inhaling (10), semi-open impeller (5), sealed axle sleeve (6), the packing box body (9), graphite packing seals (8) and gland (7), its characterized in that: the pump shaft (1) is installed in the hole of the reverse suction section (10), stepped throttling shaft sleeve (2) is installed on the pump shaft (1), L-shaped throttling bush (3) is fixedly installed in the hole of the reverse suction section (10) through set screw (4), semi-open impeller (5) is installed on the pump shaft (1) and the left end face of the semi-open impeller (5) is in contact with the right end face of the stepped throttling shaft sleeve (2), sealing shaft sleeve (6) is installed on the pump shaft (1) and the left end face of the sealing shaft sleeve (6) is in contact with the right end face of the semi-open impeller (5), stuffing box body (9) is fixedly installed at the right end face of the reverse suction section (10) through bolts, graphite packing seal (8) is installed in a seal cavity formed between the stuffing box body (9) and the sealing shaft sleeve (6), and packing gland (7) is installed at the right end face of the seal cavity of the stuffing box body (9).
2. The reverse suction section pressure relief and seal structure of the self-balancing multistage centrifugal pump according to claim 1, characterized in that: the semi-open impeller (5), the stepped throttling shaft sleeve (2) and the sealing shaft sleeve (6) share a common flat key to be arranged on the pump shaft (1).
3. The reverse suction section pressure relief and seal structure of the self-balancing multistage centrifugal pump according to claim 1, characterized in that: the diameter of the hub of the semi-open impeller (5) is equal to the diameter of the outer circle of the stepped throttling shaft sleeve (2), and the maximum diameter of the outer circle of the semi-open impeller (5) is three times of the diameter of the outer circle of the stepped throttling shaft sleeve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122259732.0U CN215672846U (en) | 2021-09-17 | 2021-09-17 | Reverse suction section pressure relief sealing structure of self-balancing multistage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122259732.0U CN215672846U (en) | 2021-09-17 | 2021-09-17 | Reverse suction section pressure relief sealing structure of self-balancing multistage centrifugal pump |
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| Publication Number | Publication Date |
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| CN215672846U true CN215672846U (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122259732.0U Active CN215672846U (en) | 2021-09-17 | 2021-09-17 | Reverse suction section pressure relief sealing structure of self-balancing multistage centrifugal pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704467A (en) * | 2022-04-06 | 2022-07-05 | 河南郑泵科技有限公司 | High-lift large-flow self-balancing multistage centrifugal pump suitable for complex water quality environment |
-
2021
- 2021-09-17 CN CN202122259732.0U patent/CN215672846U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704467A (en) * | 2022-04-06 | 2022-07-05 | 河南郑泵科技有限公司 | High-lift large-flow self-balancing multistage centrifugal pump suitable for complex water quality environment |
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