WO2003069163A1 - Boitier de pompe et dispositif de pompe - Google Patents

Boitier de pompe et dispositif de pompe Download PDF

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Publication number
WO2003069163A1
WO2003069163A1 PCT/JP2003/001493 JP0301493W WO03069163A1 WO 2003069163 A1 WO2003069163 A1 WO 2003069163A1 JP 0301493 W JP0301493 W JP 0301493W WO 03069163 A1 WO03069163 A1 WO 03069163A1
Authority
WO
WIPO (PCT)
Prior art keywords
casing
inner casing
pump
outer casing
end portion
Prior art date
Application number
PCT/JP2003/001493
Other languages
English (en)
Inventor
Yoshiaki Miyazaki
Hiroshi Uchida
Kenichi Kajiwara
Yukimasa Nakatsukasa
Original Assignee
Ebara Corporation
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ebara Corporation filed Critical Ebara Corporation
Priority to JP2003568254A priority Critical patent/JP2005517860A/ja
Priority to AU2003208007A priority patent/AU2003208007A1/en
Publication of WO2003069163A1 publication Critical patent/WO2003069163A1/fr

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

Definitions

  • the present invention relates to a pump casing and a pump apparatus, and more particularly to a pump casing comprising a plurality of plate-like members and a pump apparatus having such a pump casing.
  • a pump casing constituting a part of a pump apparatus has various shapes and structures depending on the applications of the pump apparatus.
  • a pump casing which is used as a part of the pump apparatus for delivering water, comprising a plurality of plate-like members such as sheet metal.
  • plate-like members are formed into predetermined respective shapes by press-forming, and are then joined together by welding, thus forming a pump casing (i.e. pressed pump casing) .
  • the plate-like member constituting the pump casing may comprise a stainless steel plate or the like for the purpose of lightweight and reduction in cost.
  • TIG welding tungsten inert gas arc welding
  • MIG welding metal inert gas welding
  • the present invention has been made in view of the above drawbacks. It is therefore an object of the present invention to provide a pump casing which can prevent plate-like members from being deformed at the time of welding by employing a welding process which can reduce the effect of heat on the plate-like members, and can be lightweight and be manufactured in a reduced production time, and to provide a pump apparatus having such a pump casing.
  • a pump casing comprising: at least two plate-like members formed by press-forming into predetermined shapes , the at least two plate-like members being j oined together at their circumferential portions by seam welding.
  • the effect of heat on the plate-like members to be welded can be reduced.
  • the pump casing can be lightweight.
  • the at least two plate-like members are joined together at their entire circumferential portions .
  • the at least two plate-like members comprise an inner casing serving as a vortex chamber for housing an impeller therein, and an outer casing for enclosing the inner casing so as to form a passage of a liquid between the inner casing and the outer casing.
  • the inner casing is formed into a substantially cylindrical cup shape having an opening at an upper end portion thereof and a volute portion projecting radially outwardly at a circumferential side wall of the inner casing.
  • the inner casing has a bottom wall projecting downwardly.
  • the outer casing is formed into a substantially cylindrical cup shape having an opening at an upper end portion thereof and a closed bottom wall at a lower end portion thereof.
  • the closed bottom wall of the outer casing curves upwardly from the outer circumferential portion to the central portion thereof.
  • a cylindrical end portion of the inner casing is fitted into a cylindrical end portion of the outer casing, and the inner casing and the outer casing are j oined together by seam welding at fitted portions .
  • the at least one of the inner casing and the outer casing is formed by bulge forming.
  • a pump casing comprising: an inner casing having a thin plate-like member formed by press-forming into a predetermined shape for housing an impeller therein; and an outer casing having a thin plate-like member formed by press-forming into a predetermined shape; the inner casing and the outer casing being joined together by welding.
  • a method of manufacturing a pump casing comprising: press-forming at least two plate-like members into predetermined shapes; and joining the at least two plate-like members together at their circumferential portions by seam welding.
  • a pump apparatus comprising: a pump casing having at least two plate-like members formed by press-forming into predetermined shapes, the at least two plate-like members being joined together at their circumferential portions by seam welding; an impeller housed in the pump casing; a main shaft for supporting the impeller; and a motor for rotating the main shaft and the impeller.
  • a pump apparatus comprising: an inner casing having a thin plate-like member formed by press-forming into a predetermined shape for housing an impeller therein; an outer casing having a thin plate-like member formed by press-forming into a predetermined shape; an impeller housed in the inner casing; a main shaft for supporting the impeller; and a motor for rotating the said main shaft and the impeller; the inner casing and the outer casing being joined together by welding.
  • FIG. 1 is a cross-sectional view showing a whole structure of a pump apparatus according to an embodiment of the present invention
  • FIG. 2 is a plan view showing a pump casing of the pump apparatus shown in FIG. 1; and FIG. 3 is an enlarged cross-sectional view of portion III shown in FIG . 1.
  • a pump apparatus comprises an impeller 1, a pump casing 2 in which the impeller 1 is housed, a main shaft 5 for supporting the impeller 1, and a motor 6 for rotating the impeller 1 through the main shaft 5.
  • the impeller 1 is fixed to the end portion of the main shaft 5 by a shaft nut 7 in such a manner that an impeller inlet la faces axially outwardly, and is rotated together with the main shaft 5.
  • the main shaft 5 is rotatably supported by a bearing 8 disposed near the impeller-side end portion of the main shaft 5, and a bearing (not shown in the drawings) disposed in the motor 6.
  • the main shaft 5 is coupled to the motor 6, and hence the impeller 1 is rotated together with the main shaft 5 by energizing the motor 6.
  • the pump casing 2 comprises an inner casing 3 and an outer casing 4, which are composed of a single plate-like member (sheet metal), respectively.
  • the inner casing 3 is formed into a substantially cylindrical cup shape having a circular opening at an upper end portion thereof and a volute portion 3b projecting radially outwardly at a circumferential side wall 3c of the inner casing 3.
  • the inner casing 3 has a bottom wall 3e projecting downwardly and having an open mouth 3d.
  • the outer casing 4 is formed into a substantially cylindrical cup shape having a circular opening at an upper end portion thereof and a closed bottom wall 4b at a lower end portion thereof.
  • the inner casing 3 and the outer casing 4 are joined together by seam welding at their entire circumferential portions (edge portions) .
  • a cylindrical upper end portion 3a of the inner casing 3 is fitted into a cylindrical upper end portion 4a of the outer casing 4, and the inner casing 3 and the outer casing 4 are joined together at fitted portions through a seam-welded portion 16 formed by seam welding and extending the respective circumferential portions of the inner casing 3 and the outer casing 4, thus producing the pump casing 2.
  • the inner casing 3 serves as a vortex chamber for housing the impeller 1, and the outer casing 4 is disposed outwardly of the inner casing 3.
  • Both the inner casing 3 and the outer casing 4 are made of stainless steel.
  • the pump casing 2 is fixed to a flange of the motor 6 by a plurality of bolts 9 (one bolt 9 is shown in FIG. 1) .
  • the inner casing 3 has the volute portion 3b projecting radially outwardly at the circumferential side wall 3c thereof.
  • a discharge nozzle 11 for discharging a liquid to be pumped is fixed to a portion of the volute portion 3b.
  • the volute portion 3b has a substantially spiral shape extending along the circumferential side wall 3c of the inner casing 3 toward the discharge nozzle 11, thus allowing the liquid pressurized by the rotation of the impeller 1 to flow smoothly into the discharge nozzle 11 (see broken lines shown in FIG. 2) .
  • the discharge nozzle 11 is connected to a pipe (not shown in the drawings) through a discharge-side flange 12.
  • the liquid pressurized by the rotation of the impeller 1 flows through the discharge nozzle 11, and is discharged into the pipe.
  • the discharge nozzle 11 is made of stainless cast steel.
  • a liner ring 13 is disposed between the inner casing 3 and the impeller 1.
  • the liner ring 13 is provided so as to prevent the liquid pressurized by the rotation of the impeller 1 from leaking toward a low-pressure side (e.g. the impeller inlet side) .
  • a so-called floating-type liner ring having such a structure that a ring-shaped liner ring body is housed in a space formed between a liner-ring holder and a liner-ring cover.
  • the outer casing 4 is arranged so as to enclose the inner casing 3, and a passage of the liquid is formed between the inner casing 3 and the outer casing 4.
  • the outer casing 4 has an inlet port 4c at a side thereof for introducing the liquid into the pump casing 2, and the inlet port 4c is connected to a pipe (not shown) through an inlet-side flange 15.
  • the bottom wall 4b of the outer casing 4 has a substantially hemispherical shape such that the bottom wall 4b of the outer casing 4 curves upwardly from the outer circumferential portion to the central portion thereof. With this curved structure of the bottom wall 4b, the strength of the outer casing 4 can be enhanced. Operation of the pump apparatus having the above structure will be described below.
  • a liquid is introduced from the inlet port 4c through the pipe into the outer casing 4 by the rotation of the impeller 1.
  • the flow of the liquid is regulated by a regulating vane 10, and the liquid is then sucked through the open mouth 3d of the inner casing 3 and the impeller inlet la into the impeller 1.
  • the liquid is pressurized by the rotation of the impeller 1, and is then discharged through the discharge nozzle 11 to the pipe (not shown) for delivering the pumped liquid.
  • the manufacturing process of the pump casing 2 according to the present invention will be described below.
  • the cylindrical upper end portion 3a of the inner casing 3 is fitted into the cylindrical upper end portion 4a of the outer casing 4. At this state, as shown in FIG.
  • the fitted portions, at which the inner casing 3 and the outer casing 4 are brought into close contact with each other, are joined by seam welding.
  • the seam-welded portion 16 is formed by the seam welding, and allows the inner casing 3 and the outer casing 4 to be joined together. In this manner, the pump casing 2 is manufactured .
  • Seam welding is a welding process in which two or more members are joined together by supplying current to a portion of the members to be welded in such a state that the members are clamped and pressed against each other by a pair of rotating disc electrodes for thereby applying successive spot welding to the members .
  • the advantages of seam welding are that the welding time of the seam welding is shorter than that of melting welding process such as TIG welding or MIG welding, and a welded portion has an excellent airtight and liquid-tight capability.
  • the cylindrical upper end portion 3a of the inner casing 3 is fitted into the cylindrical upper end portion 4a of the outer casing 4, and the fitted portions are joined temporarily by spot welding at certain points (e.g. four points) .
  • the fitted portions are temporarily joined in advance, and hence corrugation is prevented from being formed at the fitted portions at the time of later seam welding, and the fitted portions are thus prevented from being separated form each other due to the corrugation.
  • seam welding is carried out.
  • the welding portion can be cooled, and hence the effect of heat generated by welding on the welding portion can be reduced, thus preventing strain from being induced in the welding portion.
  • a weld trace i.e. singe
  • current is intermittently supplied to the disc electrodes at a predetermined period.
  • the seam welding has the advantage of short welding time, heat generated by welding has little effect on the members to be welded such as the inner casing 3 and the outer casing 4. Accordingly, the inner casing 3 and the outer casing 4 can be welded without being deformed . Further, a thin stainless steel plate can be used for the inner casing 3 and the outer casing 4, and hence the pump casing 2 can be lightweight. Furthermore, the seam-welded portion 16 formed in the inner casing 3 and the outer casing 4 can provide an excellent airtight and liquid-tight capability.
  • the pump casing 2 can easily be formed into a desired shape.
  • the inner casing 3 has the volute portion 3b projecting radially outwardly, and such volute portion 3b can easily be formed by bulge forming.
  • Bulge forming is a process for forming a cylindrical member into a desired shape by pressing the cylindrical member from inside against a female die provided outwardly of the cylindrical member. Specifically, the female die whose inner surface has a recess corresponding to a desired shape is set, and the cylindrical member is inserted into the female die. Thereafter, an internal pressure is applied on an inner surface of the cylindrical member by a fluid or a rubber. As a result, the cylindrical member is bulged outwardly and pressed against the inner surface of the female die, and is thus formed into a desired shape .
  • the thickness of the stainless steel plate used for the inner casing 3 is as thin as about 1.5 mm, the inner casing 3 can easily be bulged by bulge forming. Because the bulge forming is employed, the volute portion 3b can be formed from a single stainless steel plate without being divided into two pieces. Accordingly, the number of components can be reduced and manufacturing processes can be simplified.
  • outer casing 4 may be formed into a desired shape by bulge forming.
  • the present invention because seam welding is employed for joining the plate-like members constituting the pump casing, these plate-like members can be welded in a short time without being deformed. Further, the thin plate-like members can be used, and hence the pump casing can be lightweight. Furthermore, since bulge forming is employed, even if the plate-like member is formed into a complicated shape, the plate-like member can be formed into a desired shape without being divided into several pieces. As a result, the number of components can be reduced and manufacturing processes can be simplified, thus reducing manufacturing cost.
  • the present invention is applicable to a pump casing and a pump apparatus, and more particularly to a pump casing comprising a plurality of plate-like members and a pump apparatus having such a pump casing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un boîtier de pompe et un dispositif de pompe, et plus particulièrement un boîtier de pompe comprenant une pluralité d'éléments de type plaque, et un dispositif de pompe possédant ce boîtier de pompe. Un boîtier de pompe (2) comprend au moins deux éléments de type plaque (3, 4) formés à la presse dans des formes prédéterminées, et ces éléments de type plaque (au moins deux) (3, 4) sont joints ensemble au niveau de leurs parties périphériques par soudage continu.
PCT/JP2003/001493 2002-02-13 2003-02-13 Boitier de pompe et dispositif de pompe WO2003069163A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2003568254A JP2005517860A (ja) 2002-02-13 2003-02-13 ポンプケーシング及びポンプ装置
AU2003208007A AU2003208007A1 (en) 2002-02-13 2003-02-13 Pump casing and pump apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-35573 2002-02-13
JP2002035573 2002-02-13

Publications (1)

Publication Number Publication Date
WO2003069163A1 true WO2003069163A1 (fr) 2003-08-21

Family

ID=27678059

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2003/001493 WO2003069163A1 (fr) 2002-02-13 2003-02-13 Boitier de pompe et dispositif de pompe

Country Status (3)

Country Link
JP (1) JP2005517860A (fr)
AU (1) AU2003208007A1 (fr)
WO (1) WO2003069163A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620042A (en) * 1969-09-02 1971-11-16 Airtex Products Div Sheet metal water pump
US4775295A (en) * 1985-05-17 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Centrifugal pump casing
US5030061A (en) * 1988-06-01 1991-07-09 Ksb Aktiengesellschaft Casing for inline centrifugal pumps
EP0566089A1 (fr) * 1992-04-14 1993-10-20 Ebara Corporation Carter de pompe en tôle
GB2266750A (en) * 1992-05-07 1993-11-10 Falmer Investment Ltd Sheet-metal centrifugal pump casing.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620042A (en) * 1969-09-02 1971-11-16 Airtex Products Div Sheet metal water pump
US4775295A (en) * 1985-05-17 1988-10-04 Klein, Schanzlin & Becker Aktiengesellschaft Centrifugal pump casing
US5030061A (en) * 1988-06-01 1991-07-09 Ksb Aktiengesellschaft Casing for inline centrifugal pumps
EP0566089A1 (fr) * 1992-04-14 1993-10-20 Ebara Corporation Carter de pompe en tôle
GB2266750A (en) * 1992-05-07 1993-11-10 Falmer Investment Ltd Sheet-metal centrifugal pump casing.

Also Published As

Publication number Publication date
JP2005517860A (ja) 2005-06-16
AU2003208007A1 (en) 2003-09-04

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