CA2046465C - Multi-stage centrifugal pump - Google Patents
Multi-stage centrifugal pumpInfo
- Publication number
- CA2046465C CA2046465C CA002046465A CA2046465A CA2046465C CA 2046465 C CA2046465 C CA 2046465C CA 002046465 A CA002046465 A CA 002046465A CA 2046465 A CA2046465 A CA 2046465A CA 2046465 C CA2046465 C CA 2046465C
- Authority
- CA
- Canada
- Prior art keywords
- casing
- bushing
- ring
- pin
- split
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
A multi-stage centrifugal pump with an axially split casing (10) and a number of impellers (14) carried by a drive shaft (12) has inter-stage bushings (24) and rings (22) for sealing each side of each impeller. Each bushing (24) or ring (22) is conventionally prevented from rotating by a radial pin protruding from the lower half of the casing (10) into an axial slot in the periphery of the bushing or ring. The pin is necessarily small and is liable to shear, difficult to engage in the slot and, in cases where the bushing (24) or ring (22) is diametrically split, does not allow rotation of the lower half for its removal without lifting the shaft (12). To avoid all these disadvantages, the exposed end (37) of a tangential pin (32) fitted in the casing (10) is flush with the join face (28) of the casing and abuts against a shoulder (44) formed by a recess (38) in the periphery of the bushing (24) or ring (22). This pin (32) can be larger than the known radial pin and is subjected to compression, not shear.
Description
2046~65 TITLE
Multi-Stage Centrifugal Pump BACKGROUND TO THE INVENTION
This invention relates to multi-stage centrifugal pumps, and more particularly to means for preventing rotation of an inter-stage bushing or ring in a multi-stage centrifugal pump with an axially split casing which houses a shaft carrying impellers.
DESCRIPTION OF THE PRIOR ART
A multi-stage centrifugal pump has a number of inter-stage bushings and rings, sometimes called stage pieces and wear rings, which fit within the casing and have to be accurately positioned radially and locked against axial and rotational movement. These bushings and rings have essentially the same function as one another, namely to seal each side of each impeller, but the bushings have a larger radial thickness and may carry integral guide vanes for the incoming fluid whereas the rings have a smaller radial thickness and lack guide vanes. Radial positioning is by means of a close fit between the periphery of the bushing or ring and a bore machined in the casing. Axial location is by means of a flange on the bushing or ring which engages in an annular groove machined in the casing.
Hitherto, each bushing or ring has been prevented from rotating by means of a small pin fitted into a radial hole drilled in the base of the annular groove, said pin protruding into an axial slot machined in the flange. The pins have been fitted in the lower half of the casing in the vertical plane containing the pump axis, so that the axial slots in the bushings and rings could be engaged with the pins during the assembly of the shaft and 20~6465 impellers into the lower half of the casing. This arrangement has the disadvantages that the pin is necessarily small and is liable to shear if large or cyclic loads are applied to it during operation of the pump; it can be difficult to ensure correct engagement of the pin in the axial slot during assembly; and, in cases where the bushing or ring has been diametrically split to permit its easy removal, the pin does not allow rotation of the lower half to enable it to be removed without lifting the shaft.
OBJECT OF THE lNv~N.ION
The object of the present invention is to avoid the aforesaid disadvantages.
SUMMARY OF THE lNv~ ION
According to the invention, means for preventing rotation of an inter-stage bushing or ring in a multi-stage centrifugal pump with an axially split casing which houses a shaft carrying impellers are characterised by a tangential pin fitted into a hole provided in either half of the casing at its join face, the centre-line of the pin being normal to the join face and the exposed end of the pin being flush with said face, and a recess in which the pin engages provided in the periphery of the bushing or ring.
Other objects and advantages of the invention will become appararent from the following description of an embodiment of the invention, given way of example :-BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional side elevation of a multi-stage centrifugal pump with a casing which is split axially in a horizontal plane;
Figure 2 is a cross-section through the upper half of the casing on the line 2-2 in Figure 1;
Figure 3 is an end view of a diametrically split inter-stage bushing;
Figure 4 is a view of one half of the bushing in the direction of the arrow 4 in Figure 3;
Figure 5 is an end view of an inter-stage ring which is not diametrically split; and Figure 6 is a side elevation of the ring shown in Figure 5.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to Figures 1 to 4 of the drawings, in a preferred embodiment of the invention a multi-stage centrifugal pump has a casing indicated generally at 10 which is split axially in a horizontal plane and houses a power-driven shaft 12 on which there are rigidly secured a plurality of impellers 14. Each impeller 14 is disposed in a chamber 16 having an axial inlet 18 and a radial outlet 20, the chambers 16 being connected in series in well-known manner. An inter-stage ring 22 is disposed at the inlet side of each impeller 14, and an inter-stage bushing 24 carrying integral guide means 25 for the incoming fluid is disposed at the other side thereof. As exemplified in Figures 3 and 4, each bushing 24 and ring 22 is diametrically split in a plane 26 incline at, say' 10~ to the horizontal, the split being below the joint face 28 of the casing 10 at that side of the casing 10 where the periphery of the rotating shaft 12 moves upwardly.
The two halves of each bushing 24 (and ring 22) are located together by dowels 30. Each bushing 24 (and ring 22) is prevented from rotating by a tangenti/al pin 32 (see Figure 2) driven into a hole 34 machined in the upper half 36 of the casing 10 at its joint face 28, the centre-line 29 of the pin 32 being normal to the joint face 28 and the exposed end 37 of the pin 32 béing flush with the joint face 28. The pin 32 engages in a recess 38 machlned in a flange 40 on the upper half 42 of the bushing 24 (or ring 22) the recess 38 including a shoulder 44 against which the exposed end 37 of the pin 32 abuts. The flange 40 engages in known manner in an annular groove 45 machined in the casing 10. In practice, due to manufacturing tolerances, the exposed end 37 of the pin 32 may be slightly short of the joint face 28 of the casing 10 without departing from the scope of the invention, but it must not protrude beyond said face. The pin 32 is positioned at that side of the casing 10 which places said pin under compression if the bushing 24 (or ring 22) tends to rotate in the same direction as the shaft 12.
In a modification exemplified by the ring 22 shown in Figures 5 and 6, the bushing 24 and rings 22 are not diametrically split, in which case the pins 32 can equally well be fitted in the lower half 46 of the casing 10.
In another modification, the recess 38 is machined in a suitable part of the periphery of the bushing 24 (or ring 22) other than the axial location flange 40 thereon.
Arrangements in accordance with the invention have the advantages that the pin 32 can be much larger than the 6~6S
radial pin used hitherto and is in compression, not shear, so that it will readily withstand all anticipated loadings;
there is a greater certainty of correct engagement of the pin 32 in the recess 38, and if engagement is not achieved further assembly of the pump is prevented; and, in cases where the bushing 24 (or ring 22) is diametrically split and the pin 32 is fitted in the upper half 36 of the casing 10, the lower half 48 of the bushing 24 or ring 22 can be rotated to enable it to be removed without lifting the shaft.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any A
novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
Multi-Stage Centrifugal Pump BACKGROUND TO THE INVENTION
This invention relates to multi-stage centrifugal pumps, and more particularly to means for preventing rotation of an inter-stage bushing or ring in a multi-stage centrifugal pump with an axially split casing which houses a shaft carrying impellers.
DESCRIPTION OF THE PRIOR ART
A multi-stage centrifugal pump has a number of inter-stage bushings and rings, sometimes called stage pieces and wear rings, which fit within the casing and have to be accurately positioned radially and locked against axial and rotational movement. These bushings and rings have essentially the same function as one another, namely to seal each side of each impeller, but the bushings have a larger radial thickness and may carry integral guide vanes for the incoming fluid whereas the rings have a smaller radial thickness and lack guide vanes. Radial positioning is by means of a close fit between the periphery of the bushing or ring and a bore machined in the casing. Axial location is by means of a flange on the bushing or ring which engages in an annular groove machined in the casing.
Hitherto, each bushing or ring has been prevented from rotating by means of a small pin fitted into a radial hole drilled in the base of the annular groove, said pin protruding into an axial slot machined in the flange. The pins have been fitted in the lower half of the casing in the vertical plane containing the pump axis, so that the axial slots in the bushings and rings could be engaged with the pins during the assembly of the shaft and 20~6465 impellers into the lower half of the casing. This arrangement has the disadvantages that the pin is necessarily small and is liable to shear if large or cyclic loads are applied to it during operation of the pump; it can be difficult to ensure correct engagement of the pin in the axial slot during assembly; and, in cases where the bushing or ring has been diametrically split to permit its easy removal, the pin does not allow rotation of the lower half to enable it to be removed without lifting the shaft.
OBJECT OF THE lNv~N.ION
The object of the present invention is to avoid the aforesaid disadvantages.
SUMMARY OF THE lNv~ ION
According to the invention, means for preventing rotation of an inter-stage bushing or ring in a multi-stage centrifugal pump with an axially split casing which houses a shaft carrying impellers are characterised by a tangential pin fitted into a hole provided in either half of the casing at its join face, the centre-line of the pin being normal to the join face and the exposed end of the pin being flush with said face, and a recess in which the pin engages provided in the periphery of the bushing or ring.
Other objects and advantages of the invention will become appararent from the following description of an embodiment of the invention, given way of example :-BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a sectional side elevation of a multi-stage centrifugal pump with a casing which is split axially in a horizontal plane;
Figure 2 is a cross-section through the upper half of the casing on the line 2-2 in Figure 1;
Figure 3 is an end view of a diametrically split inter-stage bushing;
Figure 4 is a view of one half of the bushing in the direction of the arrow 4 in Figure 3;
Figure 5 is an end view of an inter-stage ring which is not diametrically split; and Figure 6 is a side elevation of the ring shown in Figure 5.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to Figures 1 to 4 of the drawings, in a preferred embodiment of the invention a multi-stage centrifugal pump has a casing indicated generally at 10 which is split axially in a horizontal plane and houses a power-driven shaft 12 on which there are rigidly secured a plurality of impellers 14. Each impeller 14 is disposed in a chamber 16 having an axial inlet 18 and a radial outlet 20, the chambers 16 being connected in series in well-known manner. An inter-stage ring 22 is disposed at the inlet side of each impeller 14, and an inter-stage bushing 24 carrying integral guide means 25 for the incoming fluid is disposed at the other side thereof. As exemplified in Figures 3 and 4, each bushing 24 and ring 22 is diametrically split in a plane 26 incline at, say' 10~ to the horizontal, the split being below the joint face 28 of the casing 10 at that side of the casing 10 where the periphery of the rotating shaft 12 moves upwardly.
The two halves of each bushing 24 (and ring 22) are located together by dowels 30. Each bushing 24 (and ring 22) is prevented from rotating by a tangenti/al pin 32 (see Figure 2) driven into a hole 34 machined in the upper half 36 of the casing 10 at its joint face 28, the centre-line 29 of the pin 32 being normal to the joint face 28 and the exposed end 37 of the pin 32 béing flush with the joint face 28. The pin 32 engages in a recess 38 machlned in a flange 40 on the upper half 42 of the bushing 24 (or ring 22) the recess 38 including a shoulder 44 against which the exposed end 37 of the pin 32 abuts. The flange 40 engages in known manner in an annular groove 45 machined in the casing 10. In practice, due to manufacturing tolerances, the exposed end 37 of the pin 32 may be slightly short of the joint face 28 of the casing 10 without departing from the scope of the invention, but it must not protrude beyond said face. The pin 32 is positioned at that side of the casing 10 which places said pin under compression if the bushing 24 (or ring 22) tends to rotate in the same direction as the shaft 12.
In a modification exemplified by the ring 22 shown in Figures 5 and 6, the bushing 24 and rings 22 are not diametrically split, in which case the pins 32 can equally well be fitted in the lower half 46 of the casing 10.
In another modification, the recess 38 is machined in a suitable part of the periphery of the bushing 24 (or ring 22) other than the axial location flange 40 thereon.
Arrangements in accordance with the invention have the advantages that the pin 32 can be much larger than the 6~6S
radial pin used hitherto and is in compression, not shear, so that it will readily withstand all anticipated loadings;
there is a greater certainty of correct engagement of the pin 32 in the recess 38, and if engagement is not achieved further assembly of the pump is prevented; and, in cases where the bushing 24 (or ring 22) is diametrically split and the pin 32 is fitted in the upper half 36 of the casing 10, the lower half 48 of the bushing 24 or ring 22 can be rotated to enable it to be removed without lifting the shaft.
All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any A
novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
Claims (4)
1. Means for preventing rotation of an axial-fixed multi-stage bushing or ring in a high pressure multi-stage centrifugal pump with an axially split casing which houses a shaft carrying impellers; comprising:
a tangential pin means fitted into a hole provided in either half of the casing at its joint face, which hole does not extend to the exterior of the casing in order to prevent leakage of pressurized fluid pumped by said high pressure multi-stage centrifugal pump, the center-line of the pin means being normal to the joint face and the exposed end of the pin means being flush with said face; and a recess in which the pin means engages provided in the periphery of the bushing or ring.
a tangential pin means fitted into a hole provided in either half of the casing at its joint face, which hole does not extend to the exterior of the casing in order to prevent leakage of pressurized fluid pumped by said high pressure multi-stage centrifugal pump, the center-line of the pin means being normal to the joint face and the exposed end of the pin means being flush with said face; and a recess in which the pin means engages provided in the periphery of the bushing or ring.
2. Means according to claim 1, in which the pin means is positioned at that side of the casing which places it under compression if the bushing or ring tends to rotate in the same direction as the shaft.
3. Means according to claim 1, in which the recess is machined in a flange of the bushing or ring which, by engagement in an annular groove in the casing, hold the bushing or ring axially fixed.
4. Means according to claim 1, in which the casing is split in a horizontal plane, the bushing or ring is split in a different plane, and the pin means is fitted in a hole machined in the upper of the casing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9015047.5 | 1990-07-07 | ||
| GB909015047A GB9015047D0 (en) | 1990-07-07 | 1990-07-07 | Multi-stage centrifugal pumps |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2046465A1 CA2046465A1 (en) | 1992-01-08 |
| CA2046465C true CA2046465C (en) | 1998-09-22 |
Family
ID=10678810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002046465A Expired - Lifetime CA2046465C (en) | 1990-07-07 | 1991-07-08 | Multi-stage centrifugal pump |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0466350B1 (en) |
| AT (1) | ATE106994T1 (en) |
| CA (1) | CA2046465C (en) |
| DE (1) | DE69102357T2 (en) |
| ES (1) | ES2057773T3 (en) |
| GB (1) | GB9015047D0 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0401188D0 (en) * | 2004-01-21 | 2004-02-25 | Weir Pumps Ltd | Pump casing |
| DE102008033073B3 (en) * | 2008-07-15 | 2009-12-03 | Ruhrpumpen Gmbh | Centrifugal pump, has flow channel provided between inlet and outlet, and positioning unit attached at separating wall in selectable angle distance from guiding device and accommodated in region of mold parting line |
| CN103291462B (en) * | 2013-01-05 | 2015-08-05 | 中国航空工业集团公司西安飞机设计研究所 | A kind of split type fuel pump method of discharge |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB100858A (en) * | 1916-03-29 | 1916-07-20 | G & J Weir Ltd | Improvements in Centrifugal or the like Pumps. |
| US1639279A (en) * | 1923-05-16 | 1927-08-16 | Frederick Iron And Steel Compa | Wearing ring for rotary elements |
| US1743348A (en) * | 1928-05-07 | 1930-01-14 | Byron Jackson Pump Co | Centrifugal-pump assembly |
| FR850685A (en) * | 1938-05-21 | 1939-12-22 | G & J Weir | Improvements to rotary pumps |
| CA957563A (en) * | 1970-12-21 | 1974-11-12 | Carl J. Blom | Multistage pump and manufacturing method |
-
1990
- 1990-07-07 GB GB909015047A patent/GB9015047D0/en active Pending
-
1991
- 1991-06-24 DE DE69102357T patent/DE69102357T2/en not_active Expired - Lifetime
- 1991-06-24 ES ES91305692T patent/ES2057773T3/en not_active Expired - Lifetime
- 1991-06-24 AT AT91305692T patent/ATE106994T1/en not_active IP Right Cessation
- 1991-06-24 EP EP91305692A patent/EP0466350B1/en not_active Expired - Lifetime
- 1991-07-08 CA CA002046465A patent/CA2046465C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0466350B1 (en) | 1994-06-08 |
| DE69102357D1 (en) | 1994-07-14 |
| CA2046465A1 (en) | 1992-01-08 |
| ES2057773T3 (en) | 1994-10-16 |
| ATE106994T1 (en) | 1994-06-15 |
| DE69102357T2 (en) | 1995-01-19 |
| GB9015047D0 (en) | 1990-08-29 |
| EP0466350A3 (en) | 1992-02-26 |
| EP0466350A2 (en) | 1992-01-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |