CN201818502U - Multistage centrifugal pump with thrust bearing assembly - Google Patents
Multistage centrifugal pump with thrust bearing assembly Download PDFInfo
- Publication number
- CN201818502U CN201818502U CN2010201644573U CN201020164457U CN201818502U CN 201818502 U CN201818502 U CN 201818502U CN 2010201644573 U CN2010201644573 U CN 2010201644573U CN 201020164457 U CN201020164457 U CN 201020164457U CN 201818502 U CN201818502 U CN 201818502U
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- Prior art keywords
- impeller
- bearing assembly
- thrust bearing
- centrifugal pump
- multistage centrifugal
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Abstract
The utility model relates to a multistage centrifugal pump with a thrust bearing assembly, which is characterized in that the high-pressure sealing thrust bearing assembly is arranged on a shaft of the multistage centrifugal pump provided with a series of impellers, the thrust bearing assembly can effectively balance the axial thrust generated by the impellers, and the multistage centrifugal pump is particularly suitable for being used for conveying solid-liquid mixtures (the diameter d of solid particles is smaller than or equal to 2mm). Because the pressure of lubricating liquid (clean lubricating liquid) in the thrust bearing assembly is greater than the pressure of liquid inside the pump, and the multistage centrifugal pump ensures that liquid flowing through the mechanical sealing part arranged between the impellers and the thrust bearing assembly is lubricating liquid instead of conveyed liquid. Meanwhile, the liquid is prevented from flowing to other parts in the pump through a sealing element by the high pressure difference, and the abrasion and the corrosion on the parts are avoided.
Description
Technical field
The present invention relates to a kind of multistage centrifugal pump that is used to carry solidliquid mixture, relate in particular to a kind of multistage centrifugal pump that thrust bearing assembly is housed.
Background technique
All impellers are installed on the same axis in the multistage centrifugal pump of general type, pump, and the liquid process inlet segment of carrying in the pump enters the suction chamber of first stage impeller, all can raise through pressure behind each impeller, and the delivery chamber from impeller flows to water exit end at last.
Each grade impeller all has an end thrust to affact on the axle, all impeller action must balance in some way to the end thrust on the axle, usually the method for balancing axial thrust is that impeller is installed on the axle with a specific order and direction, for example, first group of impeller can align with an end of axle, this group impeller inlet all facing one direction, second group of impeller can align with the other end of axle, this group impeller inlet is all towards the opposite direction of first group of impeller inlet.Liquid flows into the import of second group of first impeller by the outlet of first group of last impeller, and this mode can balance most of end thrust.
The method of above-mentioned balance multistage centrifugal pump end thrust can suppress the generation of axial force, but it also has drawback, import at first group of impeller outlet and second group of first stage impeller, because pressure difference is bigger, can cause the liquid carried in the pump to cross axle sleeve between these impellers, if the liquid of being carried is solidliquid mixture, in this case with very high velocity flow, high velocity liquid is known from experience the abrasion that causes part in the pump, thereby causes the damage of pump.Can certainly take more rational design, select the axle sleeve that can be fit to this high pressure difference for use, still, the phenomenon of part abrasion still can not solve effectively in the pump, still can reduce the working life of pump.
The method of another kind of balance multistage centrifugal pump end thrust is to provide a waterpower thrust to pump, this method is that the high pressure offset in the pump of the pressure that utilizes a Balance disc or balancing drum to produce at inlet segment is poor, but abrasion phenomenon recited above also can appear in this method.
The method of end thrust in a kind of new ballast pump is provided, avoids occurring above-mentioned described abrasion phenomenon simultaneously, this pump will be subjected to client's welcome very much, and this present invention just addresses that need.
Summary of the invention
The present invention is embodied in an end thrust that thrust bearing assembly comes the balance impeller to produce has been installed in multistage centrifugal pump, and this pump has avoided adopting axle sleeve to regulate high pressure difference, and this pump is particularly useful for carrying solidliquid mixture.
Specify as follows; All impellers of multistage centrifugal pump of the present invention all are installed on the axle, each impeller closely is bound up on the axle by key and snap ring, when liquid flows into and when outlet is flowed out from each grade impeller inlet, the pressure of liquid all can increase, the import of first-stage double-absorption impeller links to each other with the inlet segment of frame, the outlet of impeller links to each other with the water exit end of frame, all impellers are arranged on the axle according to both definite sequences, the outlet of first-stage double-absorption impeller links to each other with the import of second level impeller, and the outlet of second level impeller links to each other with the import of next stage impeller, connect successively, thereby guaranteed liquid each impeller of flowing through smoothly.
Two types choma is equipped with on the both sides of impeller, preoral loop and back choma, the bearing and the bearing housing that also comprise back shaft in the frame, first mechanical seal are installed between thrust bearing assembly and the impeller, and second mechanical seal is installed between frame and the axle.
In this invention, thrust bearing assembly is installed in the bearing support, and be connected with axle, thrust bearing assembly comprises thrust disc and bearing shell, bearing support and frame are by Bolt Connection together, first mechanical seal is installed between it and impeller, the pressure that the liquid that offers the Lubricants by thrust bearing assembly and flow out from impeller is complementary, thereby the pressure difference of mechanical seal place will be dropped to a very low scope, therefore, this thrust bearing assembly can be eliminated the end thrust of all impeller action to the axle.
The multistage centrifugal pump of this invention is particularly useful for carrying solidliquid mixture, when the liquid of carrying has solid particle, the pressure of the Lubricants owing to flow through in the thrust bearing assembly is greater than fluid pressure in the pump, the liquid of mechanical seal control channel of having guaranteed to flow through is Lubricants, rather than the mixed solution of being carried, low differential pressure can guarantee that flow rate of liquid is relatively low simultaneously, thereby the wearing and tearing that guaranteed Sealing and impeller reach minimum value.Lubricants is carried by a high-pressure service pump, and the Lubricants in the thrust bearing assembly cools off by the circulatory system of a heat exchanger.
Second mechanical seal is installed in motor side in the pump, and it is unique mechanical seal that prevents the leak of liquid of carrying in the pump.
Other characteristics of the present invention and advantage will appear in the following narration, in conjunction with the accompanying drawings, in the mode of example, set forth the principle of invention.
Description of drawings
Fig. 1 is the multistage centrifugal pump sectional view that thrust bearing assembly is housed of the present invention.
Among the figure: 1. inlet segment, 2. water exit end, 3. spool, 4. frame, 5. impeller, 6. stator, 7. inlet side, 8. outlet limit, 9. suction chamber, 10. delivery chamber, 11. preoral loop, 12. back chomas, 13. thrust bearing assemblies, 14. bearing suppories, 15. mechanical seal, 16. thrust discs, 17. bearing shells, 18. high-pressure service pumps, 19. inlet ball valve, 20. heat exchangers, 21. oil pipes, 22. heat exchanger cooling water intakes, 23. heat exchanger cooling water outlet, 24. mechanical seals, 25. cooling collars, 26. bolts.
Embodiment
With reference to accompanying drawing, the multistage centrifugal pump of being showed in the accompanying drawing is used to carry solidliquid mixture (solid particle diameter d≤1mm).This pump comprises a frame (4), comprises an inlet segment (1) and a water exit end (2) in the frame (4).What impeller (5) was parallel is installed on the axle (3), axle and impeller are driven by a power unit such as motor (not providing on the figure) and rotate, all impellers closely are bound up on the axle by key and snap ring (not providing on the figure), also comprise the bearing and the bearing housing (not providing on the figure) of back shaft in the frame.
Each impeller (5) all comprises an import and an outlet, import mainly receives from the liquid in the suction chamber (9), outlet mainly is that the liquid that sucks from import is transported to delivery chamber (10), each impeller rotates in specific doughnut, in its periphery is delivery chamber, liquid flows into the suction chamber (9) of next stage impeller by the passage in the frame (4) from the outlet of each grade impeller.In first passage, liquid flows to the suction chamber of second impeller from the delivery chamber of first impeller, in second passage, liquid flows to the suction chamber of the 3rd impeller from second impeller delivery chamber, and the like, frame the effect interior and stator (6) that impeller is adjacent is to prevent that streaming from appearring when entering import in liquid.
Import round each grade impeller of axle (3) receives from the liquid in each suction chamber, the outlet of each grade impeller is transported to annular delivery chamber (10) to liquid with the form of jet, in first stage impeller, comprise two imports, such structure helps increasing the intake of pump water inlet section (1).
The both sides of impeller (5) are equipped with two types choma, preoral loop (11) separates suction chamber of impeller (7) and delivery chamber (10), back choma (12) the suction chamber of the delivery chamber of previous stage impeller and back one-level impeller separately, before and after complementary mazy groove (not providing on the figure) can confined liquid on the choma speed in certain scope, thereby prevent that liquid from revealing from choma.
Impeller in the running, must produce the axial force that acts on the axle (3), the direction of these axial forces is pointed to the left side among the figure and is increased gradually, this is because liquid effects can make impeller obtain very high pressure after to the impeller, and some suffered pressure of the left side of impeller is less, the result causes the axial force direction left, towards the direction of suction chamber.
In the multistage centrifugal pump of the present invention, all axial force of impeller all arrive on the axle (3) with identical directive effect, all axial forces left side in figure added together, the thrust bearing assembly (13) that these axial forces all are installed on the impeller shaft balances, thrust bearing assembly (13) is installed in the bearing support (14), bearing support (14) leans on Bolt Connection together with frame (4), and first mechanical seal (15) is installed between thrust bearing assembly (13) and the impeller.
Thrust bearing assembly (13) comprises a thrust disc (16), two bearing shells (17), wherein thrust disc (16) is between two bearing shells (17), Lubricants also is positioned at two bearing shells (17) and locates, thrust disc (16) is fixed on the axle (3), and rotate together with the axis, two bearing shells (17) then are fixed in the bearing support (14), and Lubricants is carried by a high-pressure service pump (18).For example, a positive displacement pump, by an inlet ball valve (19), lubricant oil is transported between two bearing shells (17), between two bearing shells (17) and thrust disc (16), form one deck oil film, limit the axial displacement that the thrust disc (16) that is fixed together with axle (3) or any thrust cause with this.
Lubricants in the thrust bearing assembly (13) relies on a heat exchanger (20) to form circulating cooling system, and when the pressure of impeller generation was higher, Lubricants circulated by the oil pipe (21) in the heat exchanger (20).Cooling water, flows out from heat exchanger cooling water outlet (23) through heat exchanger (20) by heat exchanger cooling water intake (22), offers the cooling of Lubricants necessity.
High-pressure service pump (18) provides certain pressure to Lubricants, for example, and 0.7MP
aWorking pressure, pressure than the impeller outlet is big, this less relatively pressure difference has great significance for the mechanical seal between impeller and thrust bearing assembly (13), Lubricants pressure is higher than the pressure of liquid in the pump, and the liquid of the mechanical seal that can guarantee to flow through is Lubricants rather than the solidliquid mixture carried.In addition, less relatively pressure difference can guarantee that Lubricants can both flow to mechanical seal fully when any solidliquid mixture is appointed in conveying, has guaranteed that the abrasion of mechanical seal reaches minimum.
Second mechanical seal (24) is installed in the motor side of axle (3), adjacent with first stage impeller, this sealing can be used as the two way sealed of the buffer solution that sealing provides from the pressurized source (not providing on the figure) of outside, allow buffer solution to flow in the import and frame of first stage impeller with the outside of certain flow by mechanical seal, the cooling collar of a routine (25) is around being installed in the mechanical seal (24).
From above narration, can draw, the present invention mainly is a kind of improved multistage centrifugal pump, especially when carrying solidliquid mixture, can avoid the excessive wear and the erosion of pump effectively, this pump can be eliminated the High Pressure Difference of liquid in the pump effectively, thus the high speed flow that causes when avoiding solidliquid mixture in pump, to flow.
Claims (4)
1. multistage centrifugal pump that thrust bearing assembly is housed, be particularly useful for carrying the multistage centrifugal pump of solidliquid mixture, largest solid particle diameter d≤1mm, its composition comprises inlet segment (1), water exit end (2), axle (3), frame (4), impeller (5), inlet side (7), outlet limit (8), suction chamber (9), delivery chamber (10), preoral loop (11), back choma (12), thrust bearing assembly (13), mechanical seal (15), inlet ball valve (19), heat exchanger (20), oil pipe (21), heat exchanger cooling water intake (22), heat exchanger cooling water outlet (23), mechanical seal (24), cooling collar (25), it is characterized in that comprising in the frame (4) inlet segment (1) and a water exit end (2), what all impellers (5) were parallel is installed on the axle (3), each impeller closely is bound up on the axle by key and snap ring, the import of first-stage double-absorption impeller links to each other with the inlet segment (1) of frame (4), the outlet of impeller links to each other with the water exit end of frame (2), the outlet of first-stage double-absorption impeller links to each other with the import of second level impeller, and the outlet of second level impeller links to each other with the import of next stage impeller, connect successively, the both sides of impeller (5) are equipped with two types choma, preoral loop (11) and back choma (12), the bearing and the bearing housing that also comprise back shaft in the frame, thrust bearing assembly (13) is installed in the bearing support (14), bearing support (14) leans on Bolt Connection together with frame (4), first mechanical seal (15) is installed between thrust bearing assembly (13) and the impeller, second mechanical seal (24) is installed between frame (4) and the axle (3), thrust bearing assembly (13) comprises thrust disc (16) and bearing shell (17), it is characterized in that, thrust disc (16) is fixed on the axle (3), and and impeller (5) rotate together, thrust disc (16) is positioned between two bearing shells (17), and two bearing shells (17) then are fixed in the bearing support (14).
2. multistage centrifugal pump as claimed in claim 1 is characterized in that, thrust bearing assembly (13) comprises a heat exchanger (20) that can make Lubricants form circulating cooling system.
3. multistage centrifugal pump as claimed in claim 1 is characterized in that, cooling water, flows out from heat exchanger cooling water outlet (23) through heat exchanger (20) by heat exchanger cooling water intake (22), offers the cooling of Lubricants necessity.
4. multistage centrifugal pump as claimed in claim 1 is characterized in that, second mechanical seal (24) is the sealing that axle (3) is gone up unique leak of liquid that prevents to be carried.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201644573U CN201818502U (en) | 2010-04-19 | 2010-04-19 | Multistage centrifugal pump with thrust bearing assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201644573U CN201818502U (en) | 2010-04-19 | 2010-04-19 | Multistage centrifugal pump with thrust bearing assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201818502U true CN201818502U (en) | 2011-05-04 |
Family
ID=43916459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201644573U Expired - Fee Related CN201818502U (en) | 2010-04-19 | 2010-04-19 | Multistage centrifugal pump with thrust bearing assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201818502U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329282A (en) * | 2014-10-30 | 2015-02-04 | 中国核动力研究设计院 | Electromagnetically-lifted fully-sealed pump and start-stop method thereof |
-
2010
- 2010-04-19 CN CN2010201644573U patent/CN201818502U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329282A (en) * | 2014-10-30 | 2015-02-04 | 中国核动力研究设计院 | Electromagnetically-lifted fully-sealed pump and start-stop method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20140419 |