EP1190177B1 - Kreiselpumpe - Google Patents

Kreiselpumpe Download PDF

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Publication number
EP1190177B1
EP1190177B1 EP01911604A EP01911604A EP1190177B1 EP 1190177 B1 EP1190177 B1 EP 1190177B1 EP 01911604 A EP01911604 A EP 01911604A EP 01911604 A EP01911604 A EP 01911604A EP 1190177 B1 EP1190177 B1 EP 1190177B1
Authority
EP
European Patent Office
Prior art keywords
cylindrical body
head
pump according
heads
inserts
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
Application number
EP01911604A
Other languages
English (en)
French (fr)
Other versions
EP1190177A2 (de
Inventor
Flavio Rigon
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.)
VERTICAL S.P.A.
Original Assignee
Vertical SpA
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 Vertical SpA filed Critical Vertical SpA
Publication of EP1190177A2 publication Critical patent/EP1190177A2/de
Application granted granted Critical
Publication of EP1190177B1 publication Critical patent/EP1190177B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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

Definitions

  • the present invention relates to a centrifugal pump, particularly of the multistage type (eg. US-A-2 753 807).
  • Centrifugal pumps are constituted by a cylindrical body with two heads, i.e., an intake head and a delivery head.
  • the cylindrical body contains a plurality of stages constituted by an impeller and a diffuser which contains the impeller; the diffuser is rigidly coupled to the cylindrical body and the impeller is rigidly coupled to a motorized central shaft.
  • the diffuser and the impeller are obtained by blanking and drawing or stamping stainless steel plate, and the individual parts are joined by welding.
  • This manufacturing technology allows to contain costs, but causes several problems linked, in particular, to the low thickness of the metal plate that is used, which does not allow threading or other machining for the coupling of a plurality of stages.
  • the stages after being inserted in the cylindrical body, are packed by means of tension elements which connect the two heads and the packing load is adjusted by means of torque wrenches during tightening.
  • the packing load is designed to correctly position the diffusers so that they assume an exact position with respect to the corresponding impellers and is also designed to prevent the diffusers from being turned by the flow of water generated by the impellers or, more simply, from moving and causing noise in the pump.
  • a solution to this problem might be to provide the diffusers of the various stages by precision casting complemented by machining, but this would entail, particularly for mass-produced pumps, excessively high costs which would render the product unmarketable.
  • the aim of the present invention is to provide a pump in which the components used for the cylindrical body, the diffusers and the heads, as well as for the impellers, have a low cost without penalizing the quality of the pump.
  • a consequent primary object of the invention is to reduce to a minimum the components manufactured with expensive technologies such as precision casting.
  • Another object is to provide a pump in which the geometry of the arrangement of the internal elements, and particularly of the diffusers, is not linked to the tension of traction elements or stud bolts.
  • Another object is to provide a pump in which it is possible to disassemble and reassemble the internal pack of stages without losing the correct assembly geometry.
  • Another object is to provide a pump which has a low cost both for small production runs and for large ones.
  • a centrifugal pump comprising a cylindrical body which contains a plurality of stages with diffusers which are rigidly coupled to said cylindrical body and impellers which are rigidly coupled to a motorized shaft, and an intake head which is arranged opposite a delivery head, characterized in that the said cylindrical body is formed by means of a segment of metal pipe, said diffusers and impellers are obtained by blanking and stamping metal p late, and said heads are obtained by precision casting, coupling occurring by means of inserts which act between said cylindrical body and at least one of the heads and are arranged in blind holes in the heads and in through holes in the cylindrical body, said inserts being retained in seats by screws which pass through the inserts and engage the heads.
  • the pump according to the invention is composed of a cylindrical body 10, preferably obtained by means of a segment of stainless steel pipe, which is associated with two heads, respectively an intake head 11 and a delivery head 12, obtained by precision casting of stainless steel.
  • the intake head 11 is associated with the cylindrical body 10 by means of a weld 13
  • the delivery head 12 is associated with the cylindrical body 10 by means of insert devices, generally designated by the reference numeral 14 in Figure 1, which are described in detail hereinafter.
  • each stage is constituted by a diffuser 15 being rigidly coupled to the cylindrical body 10 and by an impeller 16 being rigidly coupled to a motorized shaft 17 arranged axially inside the body 10.
  • the delivery head 12 obtained as mentioned by precision casting, is composed of two parts 12a and 12b which are mutually coupled by screwing the part 12a onto the part 12b by using a threaded region 17.
  • the part 12a which is provided with a bearing 18, also acts as a guiding and centering element for the end 19 of the shaft 17.
  • conveyance ducts 20 which convey the water into a conveyance chamber 21 being directly connected to the delivery port 22, on which a duct, not shown, is subsequently screwed.
  • a check valve is contained in the conveyance chamber 21 and is constituted by a flow control element 23 having a cylindrical portion 24 which allows guided axial sliding within the chamber 21.
  • the flow control element 23 forms a seal on an O-ring 25 which is accommodated in an annular groove 26 provided in the part 12a of the head 12.
  • Coupling between the head 12 and the cylindrical body 10 occurs by means of the insert devices 14, which are constituted by a cylindrical insert 27 being accommodated in a blind hole 28 formed in the part 12b of the head 12 and in a through hole 29 provided in the cylindrical body 10 in an exactly corresponding region.
  • the insert 27, as shown more clearly in Figure 4, has a central hole 30 whose diameter is larger than the diameter of the shank of a screw 31 which screws into a threaded hole 32 provided in the head 12.
  • the hole 30 is internally threaded so that it is possible to insert therein, after extracting the screw 31, a threaded body which by continuing the screwing action acts as an extractor for the insert 27.
  • the head In order to provide the coupling between the head 12 and the cylindrical body 10, the head is pushed so as to cause the correct packing of all the diffusers of the various stages and determine their exact positioning when the hole 29 provided in the cylindrical body 10 is perfectly aligned with the hole 28 provided in the head 12, so that the insert 27 can be inserted and locked with the screw 31.
  • This coupling device is particularly advantageous, since correct positioning is no longer determined by the force applied between the head 12 and the cylindrical body 10 but by the alignment of the holes in which the insert is inserted.
  • the pump is mostly produced by means of blanking and stamping processes which are particularly advantageous.
  • the structure of the head provided in two parts which are screwed together, allows to contain the water hammer so that the transient mechanical stresses that it produces do not propagate in a possibly destructive manner to the underlying hydraulic stages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Reciprocating Pumps (AREA)

Claims (11)

  1. Zentrifugalpumpe, die einen zylindrischen Körper (10), der eine Vielzahl von Stufen mit Diffusoren (15), die fest mit dem zylindrischen Körper gekoppelt sind, und Pumpenräder (16) enthält, die fest mit einer motorisierten Welle (17) gekoppelt sind, und einen Einlasskopf (11) aufweist, der einem Auslasskopf (12) gegenüberliegend angeordnet ist, dadurch gekennzeichnet, dass der zylindrischen Körper (10) durch ein Segment eines Metallrohrs gebildet ist, die Diffusoren (15) und Pumpenräder (16) durch Schneiden, Stanzen und Schweißen eines Metallbleches erhalten sind, und die Köpfe (11, 12) durch Präzisionsgießen erhalten sind, wobei das Koppeln durch Einsätze (27) zustande kommt, die zwischen dem zylindrischen Körper (10) und zumindest einem der Köpfe (11, 12) wirken und in Sacklöchern (28) in den Köpfen (11, 12) und in Durchgangslöchern (29) in dem zylindrischen Körper (10) angeordnet sind, wobei die Einsätze (27) in Passsitzen durch Schrauben (31) festgehalten werden, die durch die Einsätze (27) hindurchgehen und mit den Köpfen (12) in Eingriff sind.
  2. Zentrifugalpumpe nach Anspruch 1, dadurch gekennzeichnet, dass das Metallblech, aus dem die Diffusoren und Pumpenräder gebildet sind, ein korrosionsbeständiges Stahlblech ist.
  3. Zentrifugalpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Einlass- und Auslassköpfe durch Präzisionsgießen unter Verwendung von korrosionsbeständigem Stahl mit anschließendem Nachbearbeiten bereitgestellt sind.
  4. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass zumindest der Auslasskopf an dem zylindrischen Körper durch die Wirkung der Einsätze verriegelt ist, die durch justierte Löcher gehen, die in einer Wand des zylindrischen Körpers bei Sacklöchern vorgesehen sind, die den gleichen Querschnitt aufweisen und in dem Auslasskopf vorgesehen sind, wobei das Einsetzen der Einsätze eintritt, wenn der Auslasskopf in Richtung des Einlasskopfes gedrückt wird, um das Fluchten der in dem zylindrischen Körper und in den Köpfen gebildeten Löcher mit gleichzeitigen Verdichten der Diffusoren der einzelnen Stufen zu erhalten.
  5. Pumpe nach Anspruch 4, dadurch gekennzeichnet, dass die Einsätze durch eine Schraube in Position gehalten werden, die durch ein in den Einsatz vorgesehenes Loch hindurchgeht und mit einem mit Gewinde versehenen Loch eingreift, dass in dem Kopf vorgesehen ist.
  6. Pumpe nach Anspruch 5, dadurch gekennzeichnet, dass das in dem Einsatz vorgesehene Durchgangsloch einen größeren Durchmesser als der Schraubenschaft aufweist, mit dem es nicht zusammenwirkt, wobei das Loch in dem Einsatz ein Innengewinde aufweist.
  7. Pumpe nach Anspruch 5, dadurch gekennzeichnet, dass zum Zerlegen des Kopfes eine Schraube in dem mit Gewinde versehenen Loch in dem Einsatz eingefügt wird, wobei das Schrauben der Schraube die Extraktion des Einsatzes aus dem Sackloch des Kopfes bewirkt in dem diese untergebracht ist.
  8. Pumpe nach Anspruch 1, dadurch gekennzeichnet, dass eine Förderkammer für das gepumpte Fluid in dem Auslasskopf vorgesehen und mit dem Diffusor der letzten Stufe der Pumpe verbunden ist.
  9. Pumpe nach Anspruch 8, dadurch gekennzeichnet, dass die Förderkammer ein Prüfventil mit einem Flusssteuerelement enthält, dass eine Dichtung mit einem ringförmigen Passsitz bildet, der in dem Kopf durch Nachbearbeiten nach dem Präzisionsgießen bereitgestellt wird, wobei der Passsitz einen O-Ring enthält.
  10. Pumpe nach Anspruch 9, dadurch gekennzeichnet, dass das Flusssteuerelement des Prüfventils durch Schneiden und Stanzen eines Metallbleches bereitgestellt ist.
  11. Pumpe nach Anspruch 9, dadurch gekennzeichnet, dass das Flusssteuerelement wie eine Kuppel geformt ist, die einen zylindrischen Bereich aufweist, der axial gleiten kann und durch Vorsprünge geführt ist, die in einem inneren Bereich der Förderkammer vorgesehen sind.
EP01911604A 2000-02-11 2001-02-06 Kreiselpumpe Expired - Lifetime EP1190177B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT2000PD000039A IT1315390B1 (it) 2000-02-11 2000-02-11 Pompa centrifuga perfezionata
ITPD000039 2000-02-11
PCT/EP2001/001260 WO2001059303A2 (en) 2000-02-11 2001-02-06 Centrifugal pump

Publications (2)

Publication Number Publication Date
EP1190177A2 EP1190177A2 (de) 2002-03-27
EP1190177B1 true EP1190177B1 (de) 2006-01-11

Family

ID=11451818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01911604A Expired - Lifetime EP1190177B1 (de) 2000-02-11 2001-02-06 Kreiselpumpe

Country Status (9)

Country Link
EP (1) EP1190177B1 (de)
CN (1) CN1233943C (de)
AT (1) ATE315727T1 (de)
AU (1) AU4059101A (de)
DE (1) DE60116603T2 (de)
ES (1) ES2254375T3 (de)
HK (1) HK1046946B (de)
IT (1) IT1315390B1 (de)
WO (1) WO2001059303A2 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20020095A1 (it) * 2002-05-15 2003-11-17 Vertical Srl Pompa multistadio particolarmente di tipo ad immersione
AT413427B (de) * 2004-03-01 2006-02-15 Vogel Pumpen Leitschaufelgehäuse einer pumpenstufe
ES2318969B1 (es) * 2006-06-16 2010-02-10 Bogemar, S.L. Sistema de anclaje de una envolvente exterior de un cuerpo de bomba centrifuga.
CN102966532B (zh) * 2012-11-29 2015-04-29 无锡市金城泵业制造有限公司 快接潜水管道泵的止回阀组件
CN105201861A (zh) * 2015-07-09 2015-12-30 长沙神舟水泵厂 一种新型多级离心泵装置及制造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2753807A (en) * 1952-01-21 1956-07-10 Tait Mfg Co The Centrifugal pump and method of manufacture therefor
DE3729673A1 (de) * 1987-09-04 1989-03-23 Grundfos Int Mehrstufige kreiselpumpe
US5234317A (en) * 1990-12-25 1993-08-10 Ebara Corporation Sheet metal interstage casing for a pump

Also Published As

Publication number Publication date
IT1315390B1 (it) 2003-02-10
WO2001059303A3 (en) 2001-12-20
ATE315727T1 (de) 2006-02-15
DE60116603D1 (de) 2006-04-06
ES2254375T3 (es) 2006-06-16
HK1046946A1 (en) 2003-01-30
ITPD20000039A1 (it) 2001-08-11
CN1233943C (zh) 2005-12-28
CN1363020A (zh) 2002-08-07
EP1190177A2 (de) 2002-03-27
WO2001059303A2 (en) 2001-08-16
HK1046946B (zh) 2007-01-19
AU4059101A (en) 2001-08-20
DE60116603T2 (de) 2006-08-03

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