EP2990651A1 - Boîtier de pompe - Google Patents

Boîtier de pompe Download PDF

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Publication number
EP2990651A1
EP2990651A1 EP14182156.1A EP14182156A EP2990651A1 EP 2990651 A1 EP2990651 A1 EP 2990651A1 EP 14182156 A EP14182156 A EP 14182156A EP 2990651 A1 EP2990651 A1 EP 2990651A1
Authority
EP
European Patent Office
Prior art keywords
housing
housing part
pump
pump housing
wall
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.)
Granted
Application number
EP14182156.1A
Other languages
German (de)
English (en)
Other versions
EP2990651B1 (fr
Inventor
Robert Greve
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grundfos Holdings AS
Original Assignee
Grundfos Holdings AS
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
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Application filed by Grundfos Holdings AS filed Critical Grundfos Holdings AS
Priority to EP14182156.1A priority Critical patent/EP2990651B1/fr
Priority to CN201520646076.1U priority patent/CN205243947U/zh
Priority to CN201510526181.6A priority patent/CN105387000B/zh
Publication of EP2990651A1 publication Critical patent/EP2990651A1/fr
Application granted granted Critical
Publication of EP2990651B1 publication Critical patent/EP2990651B1/fr
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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
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid 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
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/001—Preventing vapour lock
    • F04D9/002—Preventing vapour lock by means in the very pump
    • F04D9/003—Preventing vapour lock by means in the very pump separating and removing the vapour

Definitions

  • the invention relates to a pump housing of a centrifugal pump with the features specified in the preamble of claim 1.
  • Pump housings of centrifugal pumps are available in various designs.
  • the pump housing made of plastic and are typically produced by injection molding.
  • These pump housings have at least one suction connection, one pressure connection and a receptacle for a gas separator, which is arranged in the region between the suction connection and the suction opening in a corresponding receptacle integrated in the pump housing.
  • the pump housing is designed to connect a motor housing of an electric drive motor, whose shaft carries a rotatable impeller in the pump housing.
  • the electric motor is typically designed as a wet-running motor, d. H. it has a canned motor, in which the rotor of the motor is mounted. This can is sealingly connected to a bearing plate, which receives a bearing for the motor shaft and is arranged between the motor and the pump housing. This bearing plate simultaneously forms one side of the pump housing.
  • the pump housing is to be manufactured inexpensively in the plastic injection molding process, which is particularly advantageous for large and very large quantities, then one strives to the housing To construct as few housing parts as possible and to design the components as far as possible so that no lost cores are required, which considerably complicate the injection molding and in particular more expensive.
  • the invention has the object, a generic pump housing in such a way that on the one hand as little as possible housing components are required and on the other hand, this produced as possible without lost cores and can be easily mounted in the other.
  • the pump housing according to the invention of a centrifugal pump has a first housing part, which comprises at least one suction port, a pressure port and a receptacle for a gas separator and is provided for connecting an electric drive motor whose shaft carries a rotatable impeller in the pump housing.
  • a second housing part is provided which is sealingly and positively integrated into the first housing part and which forms a suction mouth and a part of a spiral housing for the impeller of the centrifugal pump.
  • the basic idea of the pump housing according to the invention insofar as it concerns the housing components to be manufactured from plastic injection molding, is to divide in two, in such a way that the first housing part the suction port, the pressure port and the receptacle for the gas separator comprises, and is also designed to connect an electric drive motor, whereas a second housing part is provided, which is sealingly and positively integrated into the first housing part and which has a suction mouth and a part of the spiral housing for forms the impeller of the centrifugal pump.
  • Under sealing in the context of the invention does not necessarily mean a 100% term seal, it is understood, however, that the seal is such that an overflow between suction and pressure side, which is separated by the second housing part, is largely avoided.
  • the seal is designed in such a way that no efficiency losses occur here.
  • the positive integration of the second housing part in the first housing part is carried out such that the second housing part is held in all directions, except for the opposite direction to the insertion direction by the first housing part positively.
  • the solution according to the invention thus makes it possible to provide a complex-shaped pump housing, which can be constructed essentially from two injection-molded plastic parts, which can be produced without lost cores, ie exclusively with drawing or other reusable cores. It can be formed in the second housing part by the advantageous division not only the suction mouth, but also a part of the spiral housing for the impeller of the centrifugal pump, which is hydraulically advantageous.
  • the housing construction according to the invention is extremely stable, since all supporting connections, namely suction port, pressure port and receptacle for the gas separator are incorporated in this first housing part and due to their arrangement, this additionally stabilize.
  • it is precisely the walls which configure this first housing part as a ventilator pump housing part which additionally stabilize the housing, whereas the second housing part, which has almost exclusively hydraulic functions, can be made comparatively light and thin-walled.
  • the production of the pump housing according to the invention is also possible in a different way.
  • both housing parts are designed as injection molded plastic parts and manufactured without lost cores, since then a cost-effective production can be done in mass production.
  • a suction chamber upstream of the suction chamber is formed between the two housing parts, in which a leading to the suction port line opens and has the receptacle for the gas separator or is connected to the line.
  • the line leading to the suction port and on the other hand a line leading to the gas separator or a receptacle for the gas separator is arranged, a calming of the flow and a separation of the gas from the liquid to be conveyed, before this through the Suction port passes and enters the actual sphere of action of the impeller.
  • a circumferential axial edge is advantageously provided on the second housing part, which is at least partially conical and sealingly engages in a corresponding receptacle in the first housing part.
  • an axial edge means an edge whose wall extends essentially in the direction parallel to the axis.
  • the assembly is facilitated, since the second housing part is automatically guided by the conicity when inserted into the first housing part in the proper seat within the first housing part, on the other hand, without incorporation of a seal solely by structural design a sealing Recording of this edge in the first housing part achieved.
  • the circumferential axial edge is preferably such that it is covered by the mounting plate in the installation position, ie when the drive motor is connected, and thus lies in the hydraulically unloaded region.
  • this circumferential axial edge on the second housing part is bounded near its tapering end by a radial wall which is provided for engagement with a shoulder in the receptacle in the first housing part.
  • a kind of stop is formed, which ensures that the second housing part can not be pushed too far into the first housing part.
  • This radial wall in conjunction with the shoulder of the receptacle of the first housing part forms a part of the positive connection between the housing parts and supports this second housing part securely in the first housing part, without that in the region of the tapered edge with increasing penetration depth of the second component in the first housing part Inadmissible high voltages can occur in this area.
  • the spiral housing which forms part of the second housing part, has a helically arranged around the central longitudinal axis of the pump housing axial wall.
  • the formation of the spiral housing through this axial wall is hydraulically particularly advantageous and can be realized within the second housing part without undercuts and thus with simple tools.
  • the spiral housing has at least one radial wall, which is also part of the second housing part and which separates the spiral housing from the suction chamber surrounding the suction chamber.
  • a wall is to be understood, which extends in the axial direction, that is arranged substantially parallel to the central longitudinal axis of the pump housing, which also forms the axis of rotation of the centrifugal wheel.
  • a wall is to be understood, which extends transversely thereto, ie, relative to the central longitudinal axis of the pump housing substantially radially.
  • a helically arranged axial wall is a wall which is arranged parallel to the central longitudinal axis of the pump housing, but the distance of which changes from this angle-dependent with respect to the central longitudinal axis, so seen in the direction of the central longitudinal axis, a helical course is formed.
  • the spiral housing is not only spirally formed with respect to an axial wall, but also has at least one radial wall which is arranged helically in relation to the central longitudinal axis, that is to say obliquely, d. H. which increases with respect to a radial plane angle-dependent, d. H. changes their distance to this radial plane.
  • This helically arranged radial wall is advantageously formed within the second housing part.
  • the second housing part advantageously has axial, ie substantially axially parallel guides, which are received in corresponding guide receptacles on the inside of the first housing part.
  • These guides form an anti-rotation device for the substantially circular second housing part, moreover facilitate the assembly in the intended position in the first Housing part and ensure installation only in the intended position.
  • the second housing part in an axial wall on a recess which is aligned with a recess in an axial wall of the first housing part and forms part of the pressure port leading to the pressure port.
  • spiral housing is connected to a channel leading to the pressure port within the first housing part. It is characterized an undercut-free channel management possible, which can be advantageously formed tool technically.
  • this can advantageously be formed open on one side, so extend into the axially encircling conical edge, said then advantageously not only this peripheral edge is interrupted in the axially aligned with the recess area, but is replaced by a corresponding increase in the receptacle for this edge.
  • This corresponding increase in the receptacle for the edge closes functionally the recess in the axially encircling edge, so that the recess in the axial wall leading to the pressure port, practically forms a closed recess, although this is formed open on one side in the second housing part.
  • the axial wall of the spiral housing is recessed starting on one side of the recess and terminating on the other side of the radial recess. In this way, the axial wall can be hydraulically effective over almost the entire circumference of the housing as part of the volute casing.
  • the first housing part has a suction mouth in sections surrounding axial wall on the free end face, the second housing part is supported.
  • This axial wall separates functionally advantageously the suction chamber from the degassing and also serves to support the second housing part in the central region, whereby a particularly stable housing construction is achieved and the walls, in particular of the second housing part can be made comparatively thin.
  • This hem wall and sections surrounding the axial wall extends advantageously in a range of 180 ° to 270 ° to the suction port and thus forms on the other side beyond the suction mouth of the flow largely foreclosed degassing.
  • This degassing space is conductively connected on its upper side with the receptacle for the gas separator or at least with a line leading there.
  • the second housing part can optionally be coupled to one of a selection of first housing parts, which differ with regard to the arrangement of the terminals.
  • a pump which is the same in terms of drive, impeller and volute casing for different housings and installation purposes without changing their hydraulic properties.
  • This may be particularly useful if, for example, special installations for heating baths are required and has the advantage that the hydraulic concept of the pump and the drive can be maintained and only the suction-side housing part, ie the first housing part, is constructive adapt.
  • the second housing part advantageously forms an axial wall and a radial wall of the spiral housing.
  • the spiral housing on the motor side final wall is advantageously formed by a bearing plate for a bearing for the shaft carrying the impeller or a flange of the can.
  • the motor-side wall which is typically formed of sheet metal, extend in a plane
  • the required for the formation of the spiral housing part is formed by the second housing part, which has the preferably helically arranged radial wall and the helically arranged axial wall ,
  • the drive unit 1 has in known manner to an electric motor which is designed as a wet-running motor and a split tube or a canned pot has, in which a rotor 3 runs, which has a shaft 4 , which is mounted on the one hand at the bottom of the canned pot and on the other hand in a bearing plate 5 each in bearings and whose free end carries a gyro 6, which rotates within the centrifugal pump 2.
  • the drive unit 1 also has an electronics housing 7, in which a frequency converter and other control and regulating electronics are provided and via which the power cord is connected.
  • the actual motor housing 8 has a flange which connects to a counter flange 13 of the pump housing 9 and is connected by four screws 10 with this.
  • the pump housing 9 is constructed from two housing parts 11, 12 which are produced as injection-molded parts without lost cores, namely a first housing part 11 and a second housing part 12.
  • the first housing part 11 has a substantially cup-shaped form with which the motor housing 8 directed connection flange 13 which defines a circular receptacle 14 towards the outside, which is for receiving the second Housing part 12 is provided and receives this form-fitting.
  • the connecting flange 13 is offset relative to the receptacle 14, as in particular from Fig. 8 is apparent.
  • This offset part 15 within the connection flange serves to receive the bearing plate 5 of the drive unit 1, when the drive unit 1 is flanged with its motor housing 8 to the pump housing 9.
  • the actual receptacle 14 extends into the interior of the first housing part 11. It is bounded by a circumferential substantially cylindrical wall 16 to the outside and by a remote part 17 to the inside.
  • the receptacle 14 is adjoined by a cup-shaped interior space inside the first housing part 1, into which a suction channel 18 leading to a suction connection 19 opens in the rear region.
  • a substantially cylindrical receptacle 20 is provided for a breather valve 21, which forms a gas separator.
  • This receptacle 20 with the breather valve 21 incorporated therein determines the mounting position of the unit and should be arranged so that the substantially cylindrical receptacle 20 is arranged vertically with its longitudinal axis, so that the breather valve 21 is arranged at the top.
  • the receptacle 20 has a recess in the bottom, which opens approximately in the region above the suction channel 18, and a recess in the cylinder wall, which also opens in the interior of the pump housing 9, above a horizontal wall 22, which is substantially parallel to the longitudinal central axis 23 of the pump housing, which coincides with the axis of rotation of the rotor 3, is arranged above this.
  • This horizontal wall 22 forms part of an axial wall 24 which surrounds the suction mouth 25 of the pump formed by a central opening in the second housing part 12 by approximately 180 ° and delimits a suction chamber 26 formed in front of the suction mouth 25 with respect to a calming and venting space 27.
  • the drive unit 1 directed end face 28 of the axial Wall 24 supports the second housing part 12 around the suction mouth 25 in the installed position.
  • This second housing part 12 has a circumferential, partially interrupted axial edge 29, which has a conically tapered to the interior of the pump housing 9 section 30 and an adjoining cylindrical portion 31.
  • the cylindrical portion 31 of the axial edge 29 merges into a radial wall 32, which extends transversely to the longitudinal central axis 23 and rests with its rear side in the stepped portion 17 of the receptacle 14.
  • the axial edge 29 is sealingly within the cylindrical wall 16 of the first housing part 11, wherein the conical section 30, which has a smaller wall thickness than the rest of the edge 29, flush against the wall 16 applies.
  • Adjoining the radial wall 32 to the interior of the pump housing 9 is an axial wall 33 which, seen in the direction of the longitudinal center axis 23, has an approximately spiral course (see FIG Fig. 3 ) and the peripheral wall of the spiral housing of the centrifugal pump 2 forms.
  • This axial wall 33 of the spiral housing initially jumps back radially inwards and defines a recess 39, then turns by about 90 ° in the actual spiral-shaped course, which terminates at the other side of the radial recess expiring.
  • a radial wall 34 connects to the pump interior back, which forms a side wall of the spiral housing and helically, ie, rising obliquely, may be formed.
  • the other side wall of the spiral housing is formed by the bearing plate 5.
  • the radial wall 34 is adjoined inwardly by a cross-sectionally double-U-shaped ring section, whose axial cylinder section 35 forms the suction port 25 of the pump and the radial bottom 36 is supported in the installed position of the end face 28 of the axial wall 24 and the horizontal wall 22.
  • guides 37 are arranged on the side of the radial wall 32 and the axial wall 33 which extend substantially parallel to the axis and engage in corresponding receptacles 38 in the first housing part 11.
  • These guides 37 in the second housing part 12 in conjunction with the receptacles 38 facilitate the insertion of the second housing part 12 in the receptacle 20 of the first housing part 11 and ensure by their inclined surfaces the automatic proper positioning during insertion and secure beyond the second housing part 12 against rotation within of the first housing part 11.
  • the axial wall 33 which bounds the volute casing on the circumference, extends to both sides of the recess 39, as shown in FIGS. 3, 5 and 9 is visible.
  • This recess 39 in the axial wall 33 is on one side, namely, open towards the axial edge 29 and continues in this.
  • a recess 40 is provided in alignment with the recess 39 in the axial wall 33, which opens into a channel 41, at the end of a pressure port 42 of the pump housing 9 is provided.
  • the recess 40 is surrounded in the region of the cylindrical wall 16 by an elevation 43 in this wall, which is formed so that this increase in installation position of the second housing part 12, the axial edge 29 in the region of the recess 39 continues flush.
  • the second housing part 12 in its manufacture as an injection molded part significantly simplified, since due to the unilaterally open recess 39 in the axial edge 29 and the axial wall 33 in this area no drawing cores are required.
  • the fluid to be delivered passes via the suction port 19 into the suction channel 18, in its alignment the axial wall 24th lies.
  • the flow is slowed down so that gas can separate out of the liquid and ascend upwards to the venting valve 21, where it reaches the outside.
  • the liquid enters the suction chamber 26, from there through the suction mouth 25 into the actual pumping chamber, where it is energized by the rotating in the volute casing impeller 6.
  • the durckbeetzschte liquid enters the channel 41 and from there to the pressure port 42nd
  • the spiral housing can be designed according to the hydraulic requirements with respect to a side wall and a peripheral wall, without the other components, namely the first housing part 11 and the completed from the bearing plate 5 to the pump drive unit in any form must be adjusted.
  • the pump can be adjusted by this first housing part 11 is shaped differently, the mechanical and hydraulic part of the pump, however, unchanged So can remain the drive unit 1 and the bearing plate 5 and 6 Kreiselrad and the second housing part 12th

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP14182156.1A 2014-08-25 2014-08-25 Boîtier de pompe Active EP2990651B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP14182156.1A EP2990651B1 (fr) 2014-08-25 2014-08-25 Boîtier de pompe
CN201520646076.1U CN205243947U (zh) 2014-08-25 2015-08-25 泵壳体
CN201510526181.6A CN105387000B (zh) 2014-08-25 2015-08-25 泵壳体

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14182156.1A EP2990651B1 (fr) 2014-08-25 2014-08-25 Boîtier de pompe

Publications (2)

Publication Number Publication Date
EP2990651A1 true EP2990651A1 (fr) 2016-03-02
EP2990651B1 EP2990651B1 (fr) 2018-07-11

Family

ID=51390070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14182156.1A Active EP2990651B1 (fr) 2014-08-25 2014-08-25 Boîtier de pompe

Country Status (2)

Country Link
EP (1) EP2990651B1 (fr)
CN (2) CN105387000B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2990651B1 (fr) * 2014-08-25 2018-07-11 Grundfos Holding A/S Boîtier de pompe
EP3757395B1 (fr) * 2019-06-28 2023-06-07 Grundfos Holding A/S Dispositif de pompe électrique avec moteur à rotor noyé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735272A1 (fr) * 1995-03-28 1996-10-02 WILO GmbH Pompe centrifuge avec déaération
DE20219186U1 (de) * 2001-12-11 2003-02-27 ASKOLL HOLDING S.r.l., Dueville, Vicenza Kreiselpumpe mit Entgaser
EP1650440A1 (fr) * 2004-10-20 2006-04-26 Pedrollo S.p.a. Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19920780A1 (de) * 1999-01-26 2000-07-27 Wilo Gmbh Kreiselpumpe mit Gasabscheidekammer
DE20005247U1 (de) 2000-03-21 2000-05-25 Grundfos A/S, Bjerringbro Kreiselpumpenaggregat
EP2990651B1 (fr) * 2014-08-25 2018-07-11 Grundfos Holding A/S Boîtier de pompe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0735272A1 (fr) * 1995-03-28 1996-10-02 WILO GmbH Pompe centrifuge avec déaération
DE20219186U1 (de) * 2001-12-11 2003-02-27 ASKOLL HOLDING S.r.l., Dueville, Vicenza Kreiselpumpe mit Entgaser
EP1650440A1 (fr) * 2004-10-20 2006-04-26 Pedrollo S.p.a. Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter

Also Published As

Publication number Publication date
CN205243947U (zh) 2016-05-18
CN105387000B (zh) 2020-05-22
EP2990651B1 (fr) 2018-07-11
CN105387000A (zh) 2016-03-09

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