WO2002097278A1 - Stage housing constructed from multiple metal sheets - Google Patents
Stage housing constructed from multiple metal sheets Download PDFInfo
- Publication number
- WO2002097278A1 WO2002097278A1 PCT/EP2002/005342 EP0205342W WO02097278A1 WO 2002097278 A1 WO2002097278 A1 WO 2002097278A1 EP 0205342 W EP0205342 W EP 0205342W WO 02097278 A1 WO02097278 A1 WO 02097278A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet metal
- stage housing
- blades
- edges
- metal part
- Prior art date
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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/063—Multi-stage pumps of the vertically split casing type
-
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
- F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
Definitions
- the invention relates to a multi-part sheet metal construction stage housing, in particular for centrifugal pumps, with blades arranged in the stage housing, flow channels delimited by the blades being covered by at least one flat sheet metal part connected to the blades.
- Centrifugal pumps manufactured in sheet metal construction as are known for example from DE 4310466 A1, have pump stages, the
- Stage housing are composed of several sheet metal parts.
- the flow-guiding channels located within a stage housing in a stator or in a feedback device are limited in their width by blades and are usually covered on both sides by housing walls.
- the housing walls of such step housings can be part of pot-shaped components or can be designed as a separate component. They are often punched out of a metal strip that is unwound from a metal roll.
- the production of such sheet metal parts is largely automatic, but it requires a relatively high amount of material, which is due to a large proportion of waste, the so-called waste. This share of waste increases the manufacturing costs considerably.
- the invention is based on the problem of simplifying the manufacture of a stage housing and at the same time reducing its manufacturing costs.
- the solution to this problem provides that several edges form the circumference of the shaped sheet metal part, that transitions having small sheet metal cutting losses are formed between adjacent edges and that two mutually opposite edges have the same cutting profile.
- a lot more wall parts can therefore be produced from a raw material to be processed. If such a housing wall is created with a punching process, the feed required for punching out must be set much lower on a press. As a result, significantly more parts can be produced per unit of time using a larger number of strokes.
- such a flat sheet metal part has an area of essentially square basic shape or a warped modification thereof and is enclosed by the edges which are arranged at an angle to one another and are connected to one another by lines.
- the transitions or corners are cut off during production and form only a minimal proportion of waste.
- the edges like the lines forming a transition between the edges, can have a rectilinear, curved and / or polygonal course according to further configurations.
- Such a flat sheet metal part has a smaller area compared to a previously known and rotationally symmetrical housing wall of a step housing. With regard to the hydraulic properties of a step housing, such a wall formation requires only a slight and therefore negligible change in efficiency.
- the flat sheet metal part whose non-rotationally symmetrical edges form the outer circumferential contour, can be adapted to the number of blades of a stator or a feedback device respectively. There is thus the possibility of forming flow-favorable transitions in the area between the blade ends or blade tips.
- the circumferential contour therefore corresponds more to a polygon.
- a surface can be selected for the sheet metal molded part, which represents an optimum between a material saving and the necessary surface for a vane duct to be covered.
- the flat sheet metal part is provided with a central opening.
- This central opening serves to lead through a shaft and / or as a throughflow opening for a fluid to be conveyed.
- Fig. 1 is a plan view of a stage housing according to the prior art
- Fig. 2 is a plan view of an inventive stage housing
- Fig. 3 is a sheet metal blank belonging to Fig. 2, the
- Fig. 4 shows a modification of a sheet metal blank
- Fig. 5 is a sheet metal blank belonging to Fig. 1 according to the prior art
- a sheet-metal molded part 4 fastened to the blades 3 and designed to be rotationally symmetrical has the function of a step housing wall and covers the between from the blades 3, the bottom surface 2 and the sheet metal part 4 formed blade channels 5. For reasons of a better view, the sheet metal part 4 is only partially shown here in order to allow an insight into the blade channels 5.
- the sheet metal part 4 is provided with a central opening 6 for the implementation of a shaft (not shown here) and / or for the passage of a fluid.
- a fluid emerging from an impeller flows into the blade channels 5 from the outside through an annular gap 7 formed in the assembled state between two stage housings. It is diverted at its radially inner end and, in the example shown, flows to a suction opening 8 arranged in the bottom surface 2 of a subsequent pump stage. It depends on the structural design of a stage housing, where the suction opening 8 is arranged, from which a transfer to a downstream pump stage takes place.
- FIG. 2 shows a new stage housing wall as a flat sheet metal part 9, likewise only partially, in order to enable the same view of the blade channels 5 as in FIG. 1.
- the flat sheet metal part 9 is of predominantly square basic shape and has a polygonal outer periphery 10. This is formed by edges 11, 11.1, or, 11.1, 11.2, which are arranged at an angle to one another and are connected to one another by lines 12 - 14. These lines can have different courses. A curved line 12, composite lines 13 and a straight line 14 are shown as examples. Other course shapes of the lines can also be used. The invention is not limited to the forms shown.
- Such a flat sheet metal part 9 has a significantly smaller area compared to the sheet metal part 4 shown in FIG. 1 for reasons of space, as a result of which considerable material savings are possible. Due to the essentially angular basic shape, which in the exemplary embodiment is comparable to a square surface, it can be cut directly from a sheet metal strip. The width of a sheet metal strip available as raw material is equal to the minimum width b of the sheet metal part 9. Thus, during production, there is only a portion of the waste that is cut off - in FIG. 3 shown in dashed lines - corresponds to corner 15 in the area of the lines 12, 13 or 14 acting as transitions.
- FIG. 3 shows a sequence of stamping steps on a sheet metal strip 16 during the production of a sheet metal part 9 from FIG. 2.
- the corners 15 remaining as waste are first cut out of a sheet metal strip 16 having a width b.
- the size of which depends on the selected course of a line 12 - 14 connecting the edges 11 - 11.2.
- a further proportion of waste arises in the manufacture of the central opening 6, which is, however, unavoidable since it is necessary to carry out a shaft.
- a separating cut then takes place in the area of the edge 11.1, in the example shown a predominantly straight cut, which separates two sheet metal parts lying against one another in the raw material.
- FIG. 4 shows a modification of the sheet metal part 9.
- the edges 11 have a curved shape like a
- FIG. 5 shows the known production of a sheet metal part 4 according to FIG. 1.
- the sheet metal strip 17 used as the raw material is shown reduced by 25% compared to FIG middle opening of the sheet metal strip 17, a new sheet metal part 9 is also shown in dashed lines for size comparison.
- the new sheet strip width b used in FIG. 3 that the previous much larger sheet metal strip width B had to be made 2 times x and 2 times y wider, resulting in a high loss of material in the form of waste.
- B b + 2 x + 2 y.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02743013A EP1390620A1 (en) | 2001-05-31 | 2002-05-15 | Stage housing constructed from multiple metal sheets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10126488.7 | 2001-05-31 | ||
DE10126488A DE10126488A1 (en) | 2001-05-31 | 2001-05-31 | Stage housing in multi-part sheet metal construction |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002097278A1 true WO2002097278A1 (en) | 2002-12-05 |
Family
ID=7686746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/005342 WO2002097278A1 (en) | 2001-05-31 | 2002-05-15 | Stage housing constructed from multiple metal sheets |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1390620A1 (en) |
DE (1) | DE10126488A1 (en) |
WO (1) | WO2002097278A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH025798A (en) * | 1988-06-24 | 1990-01-10 | Fuji Electric Co Ltd | Diffuser of multiple stage centrifugal hydraulic machine |
EP0492604A2 (en) * | 1990-12-25 | 1992-07-01 | Ebara Corporation | Interstage casing for a pump made of sheet metal |
DE4310466A1 (en) | 1993-03-31 | 1994-10-06 | Klein Schanzlin & Becker Ag | Pump stage in sheet metal construction |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT8030902V0 (en) * | 1980-12-29 | 1980-12-29 | Lowara Spa | CONTAINER FOR MULTI-STAGE PUMP STAGE. |
-
2001
- 2001-05-31 DE DE10126488A patent/DE10126488A1/en not_active Withdrawn
-
2002
- 2002-05-15 EP EP02743013A patent/EP1390620A1/en not_active Withdrawn
- 2002-05-15 WO PCT/EP2002/005342 patent/WO2002097278A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH025798A (en) * | 1988-06-24 | 1990-01-10 | Fuji Electric Co Ltd | Diffuser of multiple stage centrifugal hydraulic machine |
EP0492604A2 (en) * | 1990-12-25 | 1992-07-01 | Ebara Corporation | Interstage casing for a pump made of sheet metal |
DE4310466A1 (en) | 1993-03-31 | 1994-10-06 | Klein Schanzlin & Becker Ag | Pump stage in sheet metal construction |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 014, no. 135 (M - 0949) 14 March 1990 (1990-03-14) * |
Also Published As
Publication number | Publication date |
---|---|
DE10126488A1 (en) | 2002-12-05 |
EP1390620A1 (en) | 2004-02-25 |
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