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
  • F04D29/426—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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D5/00—Pumps with circumferential or transverse flow
  • F04D5/002—Regenerative pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D5/00—Pumps with circumferential or transverse flow
  • F04D5/002—Regenerative pumps
  • F04D5/003—Regenerative pumps of multistage type
  • F04D5/006—Regenerative pumps of multistage type the stages being axially offset

Definitions

• the invention has for its object to reduce the manufacturing outlay in side-channel centrifugal pumps of the type mentioned at the outset while maintaining a high degree of efficiency.
• the solution according to the invention consists in that the suction and the pressure intermediate piece of at least one stack of stages are formed as sheet metal parts and are arranged in an annular housing element.
• the construction effort is very low.
• the invention is based on the knowledge that the shape accuracy that is now available for sheet metal parts from the deformation technology under certain conditions it is sufficient to use such sheet metal parts as housing parts for side channel pumps.
• a prerequisite for this, however, is a simple design of the sheet metal parts such that a flat plate can be used as the initial raw part, which is then deep-drawn in the desired manner.
• the casing shell elements of successive steps can be centered at the ends against one another and in relation to the end casing parts in a known manner. You can also center the suction and pressure adapters on their outer circumference. According to the invention, however, an embodiment is preferred in which the suction and pressure intermediate pieces have radial play in the housing jacket elements and are centered from the shaft. The radial game between the Suction and pressure intermediate pieces and the housing jacket elements are expediently only available during assembly, while after completion of assembly and after centering by the shaft, the suction and pressure intermediate pieces are firmly clamped between the housing jacket elements.
• the centering from the shaft takes place in an advantageous embodiment in that a bearing bush carrier is arranged in each of the pressure intermediate pieces, which is centered on the outer circumference of an associated bearing bush sitting on the shaft.
• the intermediate suction piece can then be centered in each case by the adjacent pressure intermediate piece of the preceding stage, in that its inner bore engages over its bearing bush carrier or bearing bush.
• the housing parts enclosing the impeller, like the impeller itself, are thus centered by the shaft.
• the shaft in turn is centered in relation to the outer housing.
• the bearing bush carriers can be formed on the pressure intermediate pieces by pulling or other non-cutting deformation; but they can also be welded to it. With regard to the accuracy of fit, they are expediently machined outside and inside. The latter also applies to the centering hole of the intermediate suction piece, while the outer diameters of the suction and pressure intermediate pieces generally do not require any machining.
• the gap accuracy between the suction and pressure intermediate pieces on the one hand and the impeller on the other hand can be promoted in the shaping of these housing parts from sheet metal in that according to the invention the suction intermediate piece as a whole or at least in its area interacting with the impeller is designed as a flat plate. Because of this this is Housing part, which cooperates with the impeller over a particularly large area, is not exposed to warping. The entire radially outer boundary of the delivery space is allocated to the pressure intermediate piece, which is subject to greater deformation anyway and interacts with the impeller with a smaller surface area. On the one hand, this results in the advantage that those surfaces of the intermediate pieces in which larger manufacturing tolerances have to be expected interact with the impeller to a lesser extent, so that an overall optimally small impeller play is achieved under the given deformation conditions becomes.
• a circumferential groove which is in principle undesirable and limited in cross section by this curvature and the suction intermediate piece, is formed in the area of this curvature. If, as usual, the radially outer boundary of the delivery chamber were to be partially assigned to the intermediate suction piece and partially to the intermediate pressure piece, this groove would be twice as large due to the curvature on both sides; the leakage current would accordingly be at least twice as large. Because the working space is limited radially on the outside exclusively by the pressure adapter, while the suction adapter is flat, this leakage current is minimized.
• a simple and effective way of guaranteeing the distances between the individual stage packages can be achieved in that the suction and pressure intermediate pieces are axially fixed between the housing jacket elements.
• the associated suction and pressure intermediate pieces must also be fixed to each other in the circumferential direction. This is done in the simplest way according to the invention in that a recess is punched into the circumference of one of these parts, into which a projection of the other part engages.
• This arrangement expediently lies within the edge region, the suction and pressure intermediate pieces, which lies between the end faces of adjacent casing elements. For example, a narrow cutout can be punched into the suction intermediate piece on the circumference, into which a tab that is notched on the circumference by the pressure intermediate piece engages.
• These shaped elements do not require any additional production outlay, because they can be attached at the same time as the rest of the shaping process of the sheet metal parts.
• the entire stage packages can be arranged according to the invention in a pot surrounding them, which is expediently also provided with suction and pressure ports, only this pot being sealed from the atmosphere. needs to be tested.
• a single housing sealing point is usually sufficient for this. Any leaks between the steps and the interior of the surrounding pot can generally be neglected, so that no special seal is required between the casing elements. However, such seals can also be added if desired.
• the housing casing elements of the step packages can be axially braced via the fastening elements of the surrounding pot.
• Fig.l shows a cross section through a first embodiment
• Fig.2 shows an enlarged detail of Fig.l
• Fig.3 shows a second embodiment.
• the housing of the pump shown in FIG. 1 is closed at the ends by the pump suction housing 2 with suction nozzle 4 and the pump pressure housing 3 with pressure nozzle 5.
• Bearing brackets 13 with ball bearings 14, which support and center the shaft 1, are connected to them.
• the suction and pressure housings 2, 3 also contain the shaft seals 19.
• cylindrical housing casing elements 8 are clamped, directly with one another and with the pump pressure housing 3 and with the pump suction housing 2 via an additional centering ring 9 centered and sealed against each other by O-rings 15.
• a suction adapter 6 and a pressure adapter 7 are clamped between the housing jacket elements 8 or between a housing jacket element 8 and the ring 9. As a result, they are axially positioned and fixed. Together with the associated impeller 10 and a casing element 8, they each form a step package.
• the outer edges of the suction and pressure intermediate pieces 6, 7 are clamped between the end faces of the housing jacket elements 8, 9 and, as long as this clamping is not yet effective during assembly, there is play in relation to the associated inner diameter of the housing jacket elements.
• the outermost suction and pressure intermediate pieces are centered by the hub parts of the suction and pressure housings 2, 3.
• the intermediate suction and pressure intermediate pieces 6, 7 are centered from the shaft 1 via a bearing bush 12.
• the pressure intermediate piece of the stage shown on the left in the drawing is welded to a bearing bush carrier 11, which cooperates in a centering manner with the outer circumference of the bearing bush 12.
• the inside diameter of the intermediate suction piece 6 of the step shown on the right is machined to match the outside diameter of the bearing bush carrier 11 and is centered by the latter.
• the pressure intermediate pieces 7 are shaped in such a way that they completely form the side channel 16 and the radially outer boundary 17 of the delivery space.
• the suction intermediate piece 6 in its entirety or only with the exception of its radially innermost region, is not the impeller cooperates, designed as a flat plate and is therefore not subject to warpage.
• the suction intermediate piece 6 consists of a relatively thick material (for example 3 mm) in order to give particularly good conditions for an invariably flat shape.
• the pressure intermediate piece 7 can be somewhat thinner (for example 2 mm).
• the curved transition of the cylindrical part 17 of the pressure intermediate piece 7 in its radial flange area results in a particularly clearly recognizable one in the enlarged illustration in FIG , approximately triangular groove delimited by the flat surface of the suction intermediate piece and the curved surface of the pressure intermediate piece, in which an undesired backflow of the conveying medium from cell to cell is possible. If, as is otherwise customary, the radially outer limitation of the delivery space in the impeller area is arranged on the suction intermediate piece 6 and in the side channel area on the pressure intermediate piece 7, the cross section of this groove would be doubled, since then the curved one Limitation would occur on both sides. As a further advantage, this is avoided by the flat design of the suction intermediate piece 6.
• the pot housing 32 is provided with both suction nozzle 4 and pressure nozzle 5. It forms the pump housing together sam with the housing cover 33, which contains the shaft seal 19. The housing is held by the bearing bracket 13 with foot 34 and ball bearings 14, which support the shaft 1 on the fly.
• the outer housing 32, 33 is axially clamped together by fastening elements 24.
• the casing elements 8 and the ring elements 9 provided in this example in each step package and a transfer ring 22 are axially clamped together. Seals between the casing elements 8, 9 and the adjacent casing parts are not provided. Sealing to the outside is carried out here solely by an O-ring 15 between the outer housing parts 32, 33.
• the medium flows through the pump coming from the suction port 4 in the axial direction through the steps and into the pressure chamber 20 of the last side channel step. From here it flows through openings 21 of the transfer ring 22, which participates in the centering and axial fixing of the casing elements, into the space 23 between the pot 32 and the casing 8, 9 and finally leaves the pump through the pressure connection 5.
• suction and pressure intermediate pieces 6, 7 For an explanation of the suction and pressure intermediate pieces 6, 7 and their details, reference is made to the description of the first exemplary embodiment.
• the housing jacket elements are made several times thicker than the sheet metal parts 6, 7.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• External Artificial Organs (AREA)
• Control Of Non-Positive-Displacement Pumps (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Prostheses (AREA)
• Micromachines (AREA)
• Control Of Motors That Do Not Use Commutators (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=8012386

Family Applications (1)

Country Status (16)

Families Citing this family (12)

Family Cites Families (13)

• 1995
  • 1995-08-30 DE DE29513904U patent/DE29513904U1/de not_active Expired - Lifetime
• 1996
  • 1996-08-29 NZ NZ318379A patent/NZ318379A/xx not_active IP Right Cessation
  • 1996-08-29 AT AT96930979T patent/ATE199967T1/de not_active IP Right Cessation
  • 1996-08-29 US US09/029,645 patent/US6082960A/en not_active Expired - Fee Related
  • 1996-08-29 ES ES96930979T patent/ES2156290T3/es not_active Expired - Lifetime
  • 1996-08-29 WO PCT/EP1996/003806 patent/WO1997008461A1/fr active IP Right Grant
  • 1996-08-29 PT PT96930979T patent/PT847498E/pt unknown
  • 1996-08-29 AU AU69852/96A patent/AU702493B2/en not_active Ceased
  • 1996-08-29 DE DE59606640T patent/DE59606640D1/de not_active Expired - Lifetime
  • 1996-08-29 EP EP96930979A patent/EP0847498B1/fr not_active Expired - Lifetime
  • 1996-08-29 DK DK96930979T patent/DK0847498T3/da active
  • 1996-08-29 CZ CZ1998283A patent/CZ286307B6/cs not_active IP Right Cessation
  • 1996-08-29 CA CA002230514A patent/CA2230514C/fr not_active Expired - Fee Related
  • 1996-08-30 TW TW085110606A patent/TW393550B/zh not_active IP Right Cessation
• 1998
  • 1998-02-20 FI FI980395A patent/FI980395A0/fi unknown
  • 1998-02-26 NO NO19980819A patent/NO312313B1/no not_active IP Right Cessation
• 2001
  • 2001-05-31 GR GR20010400838T patent/GR3035987T3/el not_active IP Right Cessation

Non-Patent Citations (1)

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