CA1266797A - Centrifugal pump housing - Google Patents
Centrifugal pump housingInfo
- Publication number
- CA1266797A CA1266797A CA000509011A CA509011A CA1266797A CA 1266797 A CA1266797 A CA 1266797A CA 000509011 A CA000509011 A CA 000509011A CA 509011 A CA509011 A CA 509011A CA 1266797 A CA1266797 A CA 1266797A
- Authority
- CA
- Canada
- Prior art keywords
- casing
- jacket
- flange
- housing
- inlet
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
- F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
ABSTRACT
The housing of a centrifugal pump is made of sheet metal and has a spherical or conical shell with a flange at one end and an inlet in the other end. The inlet is surrounded by a composite or one-piece collar having openings for the shanks of bolts which secure the housing to a fluid supplying pipe. The nuts for such bolts are confined in sockets which are provided in the outer side of the shell opposite the collar.
The flange is connected to a bearing block or to the casing of a block motor, and the shell can contain an insert which is integral with the inlet and can carry a sealing ring for the impeller.
The housing of a centrifugal pump is made of sheet metal and has a spherical or conical shell with a flange at one end and an inlet in the other end. The inlet is surrounded by a composite or one-piece collar having openings for the shanks of bolts which secure the housing to a fluid supplying pipe. The nuts for such bolts are confined in sockets which are provided in the outer side of the shell opposite the collar.
The flange is connected to a bearing block or to the casing of a block motor, and the shell can contain an insert which is integral with the inlet and can carry a sealing ring for the impeller.
Description
The invention relates to casings of centrifugal pumps.
The casing of a centriEugal pump is stressed by the pipe which supplies the fluid to its inlet and by forces which are generated by hydraulic fluid flowing from the inlet, through one or more impellers, and to the outlett The improved centrifugal pump casing is intended to withstand such forces even though it is made from sheet metal.
To this end, the casing comprises a deformation-resistant hollow jacket which consists of sheet metal and has means for fastening it to a support at the pressure side of the casing The jacket further comprises a plurality of reinforcing corrugations at the suction side of the casing, and the casing further comprises a connecting flange which is rigid with the jacket in the region of the corrugations and means for connecting the jacket to a suction line. The connecting means includes fastener means provided at the corrugations, and the corrugatlons have holes for the fastener means.
The corrugations can be provided with abutments in the region of the flange, and the casing can further comprise means for rigidly securing the flange to the jacket. Still further, the casing can comprise an insert which is provided in and is affixed to the jacket. Such insert can include a suction nozzle in the region of the flange, and the casing can further comprise an impeller in the jacket and a split ring between the impeller and the noæzle. Alternatively, the jacket can include a portion which constitutes a suction nozzle at the suction side of the casing. Such jacket can define a space which surrounds the suction nozzle, and the casing can further include reinforcing means provided in the jacket between the nozzle and the space.
The reinforcing means can include one or more stiffening ribs '~
~6~7 27~10-119 and/or a rigid metallic or synthetic plastic mass. The jacket can include a portion which deEines a lateral impeller chamber.
The improved centrifugal pump casing or housing can further comprise an axially extending inlet at the suction side. The flange can comprise separately produced parts which are bonded to the jacket in the region of the inlet, or the entire flange can be a separately produced part ~e.g., a disc) which is bonded to the jacket.
Fig. 1 is a fragmentary axial sectional view of a housing or casing which embodies one form of the invention;
Fig. 2 is a partial axial sectional view of a second casing;
Fig. 3 is an end elevational view as seen from the left-hand side of Fig. l;
Fig. ~ is a parkial axlal sectional view oE a third casing;
Fig. 5 is a partia] axial sectional view oE a fourth casing;
Fig. 6 i9 an end elavational view oE as seen from the left-hand slde of Fig. 4 or 5~
The centrifugal pump housing or casing o Fig. 1 has a flange 2 at the pressure side and an axially extending tubular inlet 9 at the suction side of a radial impeller 3. The housing further comprises a par-tly spherical, partly cylindrical and partly frustoconical shell or jacket 1 which is integral with the flange 2 and inlet 9 and surrounds the inlet and the impeller 3. The flange 2 can be connected to a bearing block or to the casing of a block motor, not shown. The collar or flange 4 at the suction side of the impeller 3 comprises a Elat disc-shaped portion 5 which surrounds the inlet 9 and is integral with the shell 1, and a set of plate- or disc-shaped parts 8 welded to the shell radially out~ardly of sealing portion 5 and provided with openings 16 for the shanks of bolts sarving as a means to separably ~6~7 27210~119 secure the collar 4 to the discharge end of a fluid-admi~ting pipe (not sho~n). The shell 1 is formed with external sockets 6 in the form of depressions disposed opposite the parts 8 of the collar 4 and serviny to receive nuts 7 which mate with the shanks of ~he aforementioned bolts. The sockets 6 are formed simultaneously with the formation of the flanye 2 and inlet 9 and contribute ~o rigidity of the housing. The dimensions of the sockets 5 are selected with a view to allow for insertion of tools which are used to apply the nuts 7 to or to disengage these nuts from the bolts. The parts 8, which are welded to the shell 1, also contribute to greater rigidity of the housing. The manner in which the parts 8 are welcled to the shell 1 is shown ln Fig. 3.
The inlet 9 is in ~rictlonal engagemen~ with a sealing ring 10 of known type. The sealing ring 10 has a U-shaped cross-sectional outline and its tubular portions flank the radially innermost portlon of the outer coverplate of the impeller 3. All parts of the housing are made of sheet metal.
An advantage of the improved housing ls that it can stand pronounced internal stresses and that it can be mass-produced from simple metallic blanks. The partly spherical,partly cylindrical and partly conlcal shape of the shell 1 also contributes to rigidity of the housing, the same as the integration of the inlet 9 into the shell 1. That portion of the housing which is attached to the fluid-admitting pipe is further reinforced ~,.
by the sockets 6 and by the parts 8 of the collar 4.
As can be seen in Fig. 3, the shell 1 can be formed with four equidistant sockets 6, one behind each of the parts 8.
Fig. 2 shows a modified housing wherein, in order to enhance the hydraulic characteristics in the : plenum chamber 11, the inlet 9 is integral with an insert or partition 12 whose larger-diameter end portion is welded to the shell 1, as at 13. The insert 12 reduces the volume of the space at the suctlon side of the impeller 3. The bond at 13 can be established by a continuous welded seam or by spot welding. ~ similar continuous or :interrupted bond is established between the housing 1 and the inlet 9, as at 14. In.all other respects, the housing of Fig~ 2 is or can be identical with the housing which is shown in Figs. 1 and 3.
Referring to Fig. 4, there is shown a housing wherein the inlet 9 is welded to the adjacent portion of the shell 1 and the shell again comprises external sockets 6 which can accommodate nuts 7 and are disposed opposite a collar including a disc-shaped or plate-like member 15 secured to the shell 1 by welding (as at 17) and provided with openings 16 for the shanks oE bolts which are to mesh with the nuts 7. A substantial part of the disc-shaped part 15 abuts against the adjacent end face of the shell 1. The bond at 17 can constitute a continuous welded seam or a series of spot welds.
The thickness of the material of the part 15 can be selected with a view to adequately reinforce the shell 1 and the entire housing of Fig. 4. The inlet 9 is a ~;~6~
separately produced tubular part which is in frictional engagement with the sealing ring 10 for the outer coverplate of the radial impeller 3. As a rule, the disc-shaped part 15 will be made from metallic sheet stock whose material may but need not be the same as that of the shell 1 and/or inlet 9 and/or sealing ring 10.
Fig. 5 shows a housing which constitutes a modification of the housing of Fig. 4 and comprises an insert 12 which is integral with the inlet 9, the same as in the embodimenk of Fig. 2. The compartment 18 which surrounds the inlet 9 can receive one or more reinforcing or stiffening elements in the form of ribs, walls, webs or the like made Erom metallic sheet stock and extending from the sockets 6 to the sealing ring 10 which is in frictional engagement with the inlet 9. Instead of or in addition to the just described stiffening means, the compartment 18 can be partially or completely filled by a rigid metallic or synthetic plastic mass to enhance the rigidity of the housing and/or to prevent penetration of the conveyed fluid which could entail a contamination and/or corrosion of the corresponding portion of the housing. The curvature of the shell 1 between the flange 2 and -the part 15 contributes to external reinforcement of the housing, and the stiffening means and/or the mass in the compartment 18 contributes to internal reinforcement of the housing so that the latter can readily withstand the anticipated stresses in spite of the fact that all of its parts are made of metallic sheet stock.
Fig. 6 shows the manner in which the disc-shaped `:
;~ - 6 -7~
part 15 of the collar at the suction side of the impeller overlies portions of the sockets 6. This part is separably secured to the discharge end of the fluid-admitting pipe by four sets of bolts and nuts. The number of sockets 6 can be increased above or reduced to less than four. Since the part 15 abuts against a substantial portion of the shell 1 and is welded thereto, it can constitute the primary reinforcing and carrying component of the entire housing.
It has been found that a shell which has a partly conical and partly spherical shape contributes significantly to riyidity of the housing.
The insert 12 is dimensionecl in such a way that it can be inserted into the shell 1 in a direction from the flange 2 toward the sockets 6 and is automatically centered by the internal surface of the shell when it reaches the position shown in Fig. 2 or 5. The sub-division of the housing into several sections (such as the sections 1, 10, 12 and 15 shown in Fig. 5) contributes to lower cost of the housing because each individual section can be mass-produced in a simple machine and at a low cost. The sealing ring 10 can be omitted if the inlet 9 is configurated in such a way that a portion of the inlet and the adjacent portion of the impeller 3 define a non-contact type seal.
The casing of a centriEugal pump is stressed by the pipe which supplies the fluid to its inlet and by forces which are generated by hydraulic fluid flowing from the inlet, through one or more impellers, and to the outlett The improved centrifugal pump casing is intended to withstand such forces even though it is made from sheet metal.
To this end, the casing comprises a deformation-resistant hollow jacket which consists of sheet metal and has means for fastening it to a support at the pressure side of the casing The jacket further comprises a plurality of reinforcing corrugations at the suction side of the casing, and the casing further comprises a connecting flange which is rigid with the jacket in the region of the corrugations and means for connecting the jacket to a suction line. The connecting means includes fastener means provided at the corrugations, and the corrugatlons have holes for the fastener means.
The corrugations can be provided with abutments in the region of the flange, and the casing can further comprise means for rigidly securing the flange to the jacket. Still further, the casing can comprise an insert which is provided in and is affixed to the jacket. Such insert can include a suction nozzle in the region of the flange, and the casing can further comprise an impeller in the jacket and a split ring between the impeller and the noæzle. Alternatively, the jacket can include a portion which constitutes a suction nozzle at the suction side of the casing. Such jacket can define a space which surrounds the suction nozzle, and the casing can further include reinforcing means provided in the jacket between the nozzle and the space.
The reinforcing means can include one or more stiffening ribs '~
~6~7 27~10-119 and/or a rigid metallic or synthetic plastic mass. The jacket can include a portion which deEines a lateral impeller chamber.
The improved centrifugal pump casing or housing can further comprise an axially extending inlet at the suction side. The flange can comprise separately produced parts which are bonded to the jacket in the region of the inlet, or the entire flange can be a separately produced part ~e.g., a disc) which is bonded to the jacket.
Fig. 1 is a fragmentary axial sectional view of a housing or casing which embodies one form of the invention;
Fig. 2 is a partial axial sectional view of a second casing;
Fig. 3 is an end elevational view as seen from the left-hand side of Fig. l;
Fig. ~ is a parkial axlal sectional view oE a third casing;
Fig. 5 is a partia] axial sectional view oE a fourth casing;
Fig. 6 i9 an end elavational view oE as seen from the left-hand slde of Fig. 4 or 5~
The centrifugal pump housing or casing o Fig. 1 has a flange 2 at the pressure side and an axially extending tubular inlet 9 at the suction side of a radial impeller 3. The housing further comprises a par-tly spherical, partly cylindrical and partly frustoconical shell or jacket 1 which is integral with the flange 2 and inlet 9 and surrounds the inlet and the impeller 3. The flange 2 can be connected to a bearing block or to the casing of a block motor, not shown. The collar or flange 4 at the suction side of the impeller 3 comprises a Elat disc-shaped portion 5 which surrounds the inlet 9 and is integral with the shell 1, and a set of plate- or disc-shaped parts 8 welded to the shell radially out~ardly of sealing portion 5 and provided with openings 16 for the shanks of bolts sarving as a means to separably ~6~7 27210~119 secure the collar 4 to the discharge end of a fluid-admi~ting pipe (not sho~n). The shell 1 is formed with external sockets 6 in the form of depressions disposed opposite the parts 8 of the collar 4 and serviny to receive nuts 7 which mate with the shanks of ~he aforementioned bolts. The sockets 6 are formed simultaneously with the formation of the flanye 2 and inlet 9 and contribute ~o rigidity of the housing. The dimensions of the sockets 5 are selected with a view to allow for insertion of tools which are used to apply the nuts 7 to or to disengage these nuts from the bolts. The parts 8, which are welded to the shell 1, also contribute to greater rigidity of the housing. The manner in which the parts 8 are welcled to the shell 1 is shown ln Fig. 3.
The inlet 9 is in ~rictlonal engagemen~ with a sealing ring 10 of known type. The sealing ring 10 has a U-shaped cross-sectional outline and its tubular portions flank the radially innermost portlon of the outer coverplate of the impeller 3. All parts of the housing are made of sheet metal.
An advantage of the improved housing ls that it can stand pronounced internal stresses and that it can be mass-produced from simple metallic blanks. The partly spherical,partly cylindrical and partly conlcal shape of the shell 1 also contributes to rigidity of the housing, the same as the integration of the inlet 9 into the shell 1. That portion of the housing which is attached to the fluid-admitting pipe is further reinforced ~,.
by the sockets 6 and by the parts 8 of the collar 4.
As can be seen in Fig. 3, the shell 1 can be formed with four equidistant sockets 6, one behind each of the parts 8.
Fig. 2 shows a modified housing wherein, in order to enhance the hydraulic characteristics in the : plenum chamber 11, the inlet 9 is integral with an insert or partition 12 whose larger-diameter end portion is welded to the shell 1, as at 13. The insert 12 reduces the volume of the space at the suctlon side of the impeller 3. The bond at 13 can be established by a continuous welded seam or by spot welding. ~ similar continuous or :interrupted bond is established between the housing 1 and the inlet 9, as at 14. In.all other respects, the housing of Fig~ 2 is or can be identical with the housing which is shown in Figs. 1 and 3.
Referring to Fig. 4, there is shown a housing wherein the inlet 9 is welded to the adjacent portion of the shell 1 and the shell again comprises external sockets 6 which can accommodate nuts 7 and are disposed opposite a collar including a disc-shaped or plate-like member 15 secured to the shell 1 by welding (as at 17) and provided with openings 16 for the shanks oE bolts which are to mesh with the nuts 7. A substantial part of the disc-shaped part 15 abuts against the adjacent end face of the shell 1. The bond at 17 can constitute a continuous welded seam or a series of spot welds.
The thickness of the material of the part 15 can be selected with a view to adequately reinforce the shell 1 and the entire housing of Fig. 4. The inlet 9 is a ~;~6~
separately produced tubular part which is in frictional engagement with the sealing ring 10 for the outer coverplate of the radial impeller 3. As a rule, the disc-shaped part 15 will be made from metallic sheet stock whose material may but need not be the same as that of the shell 1 and/or inlet 9 and/or sealing ring 10.
Fig. 5 shows a housing which constitutes a modification of the housing of Fig. 4 and comprises an insert 12 which is integral with the inlet 9, the same as in the embodimenk of Fig. 2. The compartment 18 which surrounds the inlet 9 can receive one or more reinforcing or stiffening elements in the form of ribs, walls, webs or the like made Erom metallic sheet stock and extending from the sockets 6 to the sealing ring 10 which is in frictional engagement with the inlet 9. Instead of or in addition to the just described stiffening means, the compartment 18 can be partially or completely filled by a rigid metallic or synthetic plastic mass to enhance the rigidity of the housing and/or to prevent penetration of the conveyed fluid which could entail a contamination and/or corrosion of the corresponding portion of the housing. The curvature of the shell 1 between the flange 2 and -the part 15 contributes to external reinforcement of the housing, and the stiffening means and/or the mass in the compartment 18 contributes to internal reinforcement of the housing so that the latter can readily withstand the anticipated stresses in spite of the fact that all of its parts are made of metallic sheet stock.
Fig. 6 shows the manner in which the disc-shaped `:
;~ - 6 -7~
part 15 of the collar at the suction side of the impeller overlies portions of the sockets 6. This part is separably secured to the discharge end of the fluid-admitting pipe by four sets of bolts and nuts. The number of sockets 6 can be increased above or reduced to less than four. Since the part 15 abuts against a substantial portion of the shell 1 and is welded thereto, it can constitute the primary reinforcing and carrying component of the entire housing.
It has been found that a shell which has a partly conical and partly spherical shape contributes significantly to riyidity of the housing.
The insert 12 is dimensionecl in such a way that it can be inserted into the shell 1 in a direction from the flange 2 toward the sockets 6 and is automatically centered by the internal surface of the shell when it reaches the position shown in Fig. 2 or 5. The sub-division of the housing into several sections (such as the sections 1, 10, 12 and 15 shown in Fig. 5) contributes to lower cost of the housing because each individual section can be mass-produced in a simple machine and at a low cost. The sealing ring 10 can be omitted if the inlet 9 is configurated in such a way that a portion of the inlet and the adjacent portion of the impeller 3 define a non-contact type seal.
Claims (7)
1. A centrifugal pump casing having a suction side and a pressure side and comprising a deformation-resistant hollow jacket consisting of sheet metal and having means for fastening it to a support at the pressure side of the casing, said jacket further having a plurality of reinforcing corrugations at the suction side of the casing; a connecting flange rigid with said jacket in the region of said corrugations; and means for connecting said jacket to a suction line, including fastener means provided at said corrugations, said corrugations having holes for said fastener means.
2. The casing of claim 1, wherein said corrugations have abutments in the region of said flange.
3. The casing of claim 1, further comprising means for rigidly securing said flange to said jacket.
4. The casing of claim 1, further comprising an insert provided in and affixed to said jacket and including a suction nozzle in the region of said flange, an impeller in said jacket, and a split seal provided between said impeller and said nozzle.
5. The casing of claim 1, wherein said jacket includes a portion constituting a suction nozzle at the suction side of the casing.
6. The casing of claim 1, wherein said jacket includes a portion defining a lateral impeller chamber.
7. The casing of claim 1, wherein said jacket includes a suction nozzle at the suction side of the casing and defines a space surrounding said nozzle, and further comprising reinforcing means provided in said jacket between said nozzle and said space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/025,152 US4775295A (en) | 1985-05-17 | 1986-05-09 | Centrifugal pump casing |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853517827 DE3517827A1 (en) | 1985-05-17 | 1985-05-17 | CENTRIFUGAL PUMP HOUSING |
| DEP3517827.2 | 1985-05-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1266797A true CA1266797A (en) | 1990-03-20 |
Family
ID=6271012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000509011A Expired - Lifetime CA1266797A (en) | 1985-05-17 | 1986-05-13 | Centrifugal pump housing |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0259313B1 (en) |
| JP (1) | JPS63500817A (en) |
| CN (1) | CN1004645B (en) |
| CA (1) | CA1266797A (en) |
| DE (2) | DE3517827A1 (en) |
| IN (1) | IN165644B (en) |
| WO (1) | WO1986006800A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE68921203T2 (en) * | 1988-02-29 | 1995-10-12 | Ebara Corp | CONNECTION PIECE FOR LINES IN A PUMP. |
| JP2808838B2 (en) * | 1990-06-29 | 1998-10-08 | 株式会社荏原製作所 | Centrifugal pump casing |
| IT1248200B (en) * | 1991-01-11 | 1995-01-05 | Ebara Corp | METAL SHEET CASE FOR CENTRIFUGAL PUMP |
| JP2676450B2 (en) * | 1991-01-11 | 1997-11-17 | 株式会社荏原製作所 | Sheet metal pump casing |
| DE4329019C2 (en) * | 1993-08-28 | 1999-11-04 | Ksb Ag | Centrifugal pump housing in sheet metal construction |
| DE19838798C2 (en) * | 1998-08-26 | 2002-08-29 | Ind Tech Res Inst | Pump housing made of a sheet metal and process for its manufacture |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2844100A (en) * | 1954-07-06 | 1958-07-22 | Kurt J Heinicke | Sheet metal centrifugal pump |
| GB1092533A (en) * | 1964-02-27 | 1967-11-29 | Speedwell Res Ltd | Improvements relating to pump casings |
| DK131438B (en) * | 1973-08-31 | 1975-07-14 | Danske Mejeriers Maskinfabrik | Centrifugal pump. |
| GB2010434B (en) * | 1977-12-16 | 1982-06-30 | Rolls Royce | Flanged joint structure for composite materials |
-
1985
- 1985-05-17 DE DE19853517827 patent/DE3517827A1/en active Granted
-
1986
- 1986-05-09 WO PCT/DE1986/000188 patent/WO1986006800A1/en active IP Right Grant
- 1986-05-09 DE DE8686902795T patent/DE3661759D1/en not_active Expired
- 1986-05-09 EP EP86902795A patent/EP0259313B1/en not_active Expired
- 1986-05-09 JP JP61502737A patent/JPS63500817A/en active Granted
- 1986-05-13 IN IN363/CAL/86A patent/IN165644B/en unknown
- 1986-05-13 CA CA000509011A patent/CA1266797A/en not_active Expired - Lifetime
- 1986-05-16 CN CN86103310.8A patent/CN1004645B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3661759D1 (en) | 1989-02-16 |
| EP0259313B1 (en) | 1989-01-11 |
| CN86103310A (en) | 1986-11-12 |
| EP0259313A1 (en) | 1988-03-16 |
| CN1004645B (en) | 1989-06-28 |
| IN165644B (en) | 1989-12-02 |
| DE3517827A1 (en) | 1986-11-20 |
| JPH0361040B2 (en) | 1991-09-18 |
| JPS63500817A (en) | 1988-03-24 |
| DE3517827C2 (en) | 1988-07-14 |
| WO1986006800A1 (en) | 1986-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |