CN210565305U - Two-stage centrifugal pump - Google Patents
Two-stage centrifugal pump Download PDFInfo
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- CN210565305U CN210565305U CN201921514280.2U CN201921514280U CN210565305U CN 210565305 U CN210565305 U CN 210565305U CN 201921514280 U CN201921514280 U CN 201921514280U CN 210565305 U CN210565305 U CN 210565305U
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- impeller
- pump
- mechanical seal
- shaft
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Abstract
The utility model discloses a two-stage centrifugal pump, including the pump body, preceding pump cover, back pump cover, one-level impeller, second grade impeller, pump shaft, mechanical seal, suspension bearing device, set up mechanical seal (7) between back pump cover and pump shaft, set up the through-hole that leads to the mechanical seal exocoel on the back pump cover corresponding to the middle and lower part of second grade impeller, lead the medium of the middle and lower part of second grade impeller to the mechanical seal exocoel, wash and cool mechanical seal; and the axial matching end surfaces of the nut pressing cap, the first-stage impeller, the impeller positioning sleeve, the second-stage impeller and the mechanical sealing shaft sleeve are respectively provided with a sealing ring, so that the pump shaft is not in contact corrosion with a pump cavity medium, and the service life of the pump shaft is prolonged.
Description
Technical Field
The utility model relates to a two-stage centrifugal pump.
Background
The two-stage centrifugal pump comprises a pump body, a front pump cover, a rear pump cover, a first-stage impeller, a second-stage impeller, a pump shaft, a mechanical seal and a suspension bearing device; the pump comprises a pump shaft, a pump body, a first-stage impeller, a second-stage impeller, a nut pressing cap and a mechanical seal, wherein the pump body is arranged on the pump shaft in a matched mode, the second-stage impeller is arranged on the pump shaft in a matched mode, the pump body corresponds to the pump body, the pump body is arranged at the front end of the pump shaft in a matched mode, an impeller positioning sleeve is arranged between the first-stage impeller and the second-stage impeller, the nut pressing cap is.
Above-mentioned prior art is connected with the cooling flushing pipe that leads to the mechanical seal exocoel in pump body drain pipe mouth department, and this kind of external cooling flushing pipe of mechanical seal connects the installation inconvenient, and because from pump body drain pipe mouth department promptly the high pressure portion introduces the mechanical seal exocoel with the medium, make the medium pressure who gets into the mechanical seal exocoel higher like this, make mechanical seal bear the high pressure effect, mechanical seal moves under the high pressure operating mode promptly, cause mechanical seal life to reduce, need improve the high pressure resistant design requirement to mechanical seal service behavior promptly.
In addition, the nut pressing cap, the primary impeller, the impeller positioning sleeve and the secondary impeller are mutually matched in axial end face fit, and a medium in the pump cavity can easily enter the surface of the pump shaft, so that the pump shaft is easy to corrode when a corrosive medium is conveyed, and the service life of the pump shaft is shortened; if the pump shaft is made of a material which is resistant to corrosion media, the cost of the shaft is greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to improve the defects of the prior art and provide a two-stage centrifugal pump to improve the working environment of a mechanical seal cavity of a pump shaft and reduce the working condition pressure of the mechanical seal cavity; and effectively prevent the pump shaft and the medium of carrying from contacting, prevent that the pump shaft from corroding and reduce life.
The utility model discloses a two-stage centrifugal oil pump, which comprises a pump body, a front pump cover, a rear pump cover, a primary impeller, a secondary impeller, a pump shaft, a mechanical seal and a suspension bearing device;
the rear side pump cavity key cooperation that the second grade impeller corresponds the pump body is installed on the pump shaft, and the front side pump cavity key cooperation that the one-level impeller corresponds the pump body is installed at the tip before the pump shaft, is equipped with the impeller position sleeve between one-level impeller and second grade impeller, is equipped with the nut at the pump shaft front end and presses the cap, and the nut is pressed the cap and is compressed tightly the location with one-level impeller, impeller position sleeve, the mutual axial of second grade impeller, sets up mechanical seal, characterized by between rear pump cover and pump shaft:
a through hole which leads to the mechanical seal outer cavity is formed in the rear pump cover corresponding to the middle lower part of the secondary impeller, and a medium at the middle lower part of the secondary impeller is led to the mechanical seal outer cavity to flush and cool the mechanical seal;
a first sealing ring is arranged on the axial matching end surface of the nut pressing cap and the primary impeller;
a second sealing ring is arranged on the axial matching end surface of the first-stage impeller and the impeller positioning sleeve;
a third sealing ring is arranged on the axial matching end surface of the impeller positioning sleeve and the secondary impeller;
and a fourth sealing ring is arranged on the axial matching end surface of the secondary impeller and the mechanical sealing shaft sleeve.
The utility model discloses lead to the mechanical seal exocoel with the medium of second grade impeller, guaranteed promptly to wash the cooling to mechanical seal, reduced the medium pressure of mechanical seal exocoel simultaneously, made mechanical seal not bear the high pressure effect, mechanical seal moves under the low pressure operating mode promptly, has improved mechanical seal's life. Meanwhile, the nut pressing cap, the first-stage impeller, the impeller positioning sleeve, the second-stage impeller and the mechanical sealing device are axially matched with each other, the end faces are provided with sealing rings, a medium in a pump cavity cannot enter the surface of the pump shaft, the pump shaft is not in contact corrosion with a corrosive medium, and the service life of the pump shaft is prolonged.
Drawings
FIG. 1 is a schematic structural diagram of a novel embodiment for implementation.
Detailed Description
The utility model discloses doublestage centrifugal oil pump is including the pump body 1, preceding pump cover 2, back pump cover 3, one-level impeller 4, second grade impeller 5, pump shaft 6, mechanical seal 7, suspension bearing device 8.
The pump comprises a pump shaft 6, a second-stage impeller 5, a pump body 1, a nut pressing cap 60, a pump cover 3 and a pump shaft 6, wherein the pump cover is arranged on the pump shaft 6 in a matched mode, the pump cover is arranged on the pump cover, the pump cover is arranged on the pump shaft 6, the pump cover is arranged on the pump cover, the pump cover is arranged on.
And a through hole 30 which leads to the mechanical seal outer cavity is formed in the rear pump cover 3 corresponding to the middle lower part of the secondary impeller 5, and a medium at the middle lower part of the secondary impeller 5 is led to the mechanical seal outer cavity to flush and cool the mechanical seal.
A first sealing ring a1 is arranged on the axial matching end surface of the nut pressing cap and the primary impeller;
a second sealing ring a2 is arranged on the axial matching end surface of the first-stage impeller and the impeller locating sleeve;
a third sealing ring a3 is arranged on the axial matching end surface of the impeller locating sleeve and the secondary impeller;
a fourth sealing ring a4 is arranged on the axial matching end surface of the secondary impeller and the mechanical sealing shaft sleeve;
the first sealing ring a1, the second sealing ring a2, the third sealing ring a3 and the fourth sealing ring a4 are O-shaped sealing rings.
Claims (1)
1. The two-stage centrifugal pump comprises a pump body, a front pump cover, a rear pump cover, a first-stage impeller, a second-stage impeller, a pump shaft, a mechanical seal and a suspension bearing device; the rear side pump cavity key cooperation that the second grade impeller corresponds the pump body is installed on the pump shaft, and the front side pump cavity key cooperation that the one-level impeller corresponds the pump body is installed at the tip before the pump shaft, is equipped with the impeller position sleeve between one-level impeller and second grade impeller, is equipped with the nut at the pump shaft front end and presses the cap, and the nut is pressed the cap and is compressed tightly the location with one-level impeller, impeller position sleeve, the mutual axial of second grade impeller, sets up mechanical seal, characterized by between rear pump cover and pump shaft:
a through hole which leads to the mechanical seal outer cavity is formed in the rear pump cover corresponding to the middle lower part of the secondary impeller, and a medium at the middle lower part of the secondary impeller is led to the mechanical seal outer cavity to flush and cool the mechanical seal;
a first sealing ring is arranged on the axial matching end surface of the nut pressing cap and the primary impeller;
a second sealing ring is arranged on the axial matching end surface of the first-stage impeller and the impeller positioning sleeve;
a third sealing ring is arranged on the axial matching end surface of the impeller positioning sleeve and the secondary impeller;
and a fourth sealing ring is arranged on the axial matching end surface of the secondary impeller and the mechanical sealing shaft sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921514280.2U CN210565305U (en) | 2019-09-12 | 2019-09-12 | Two-stage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921514280.2U CN210565305U (en) | 2019-09-12 | 2019-09-12 | Two-stage centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210565305U true CN210565305U (en) | 2020-05-19 |
Family
ID=70642202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921514280.2U Active CN210565305U (en) | 2019-09-12 | 2019-09-12 | Two-stage centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210565305U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115949591A (en) * | 2023-02-01 | 2023-04-11 | 广州市昕恒泵业制造有限公司 | Multi-stage middle-open double-suction centrifugal pump |
-
2019
- 2019-09-12 CN CN201921514280.2U patent/CN210565305U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115949591A (en) * | 2023-02-01 | 2023-04-11 | 广州市昕恒泵业制造有限公司 | Multi-stage middle-open double-suction centrifugal pump |
| CN115949591B (en) * | 2023-02-01 | 2023-12-08 | 广州市昕恒泵业制造有限公司 | Multistage split double-suction centrifugal pump |
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