EP1190177A2 - Kreiselpumpe - Google Patents

Kreiselpumpe

Info

Publication number
EP1190177A2
EP1190177A2 EP01911604A EP01911604A EP1190177A2 EP 1190177 A2 EP1190177 A2 EP 1190177A2 EP 01911604 A EP01911604 A EP 01911604A EP 01911604 A EP01911604 A EP 01911604A EP 1190177 A2 EP1190177 A2 EP 1190177A2
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.)
Granted
Application number
EP01911604A
Other languages
English (en)
French (fr)
Other versions
EP1190177B1 (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 Srl
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 Srl filed Critical Vertical Srl
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

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
    • 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.
  • 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.
  • 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 plate, 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.
  • Figure 1 is a general view of a pump according to the invention in the assembled condition
  • Figure 2 is a view of the pump of Figure 1, disassembled into its components
  • Figure 3 is a sectional view of the delivery head and of part of the pump body
  • Figure 4 is a sectional view of the means for connecting the delivery head to the cylindrical containment body. Ways of carrying out the Invention
  • 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.
  • insert devices generally designated by the reference numeral 14 in Figure 1, which are described in detail hereinafter.
  • the various stages of the pump are accommodated inside the cylindrical body 10; 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.
  • 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 advantages of the introduced improvements are considerable.
  • the pump is mostly produced by means of blanking and stamping processes which are particularly advantageous.

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)
EP01911604A 2000-02-11 2001-02-06 Kreiselpumpe Expired - Lifetime EP1190177B1 (de)

Applications Claiming Priority (3)

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

Publications (2)

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0159303A2 *

Also Published As

Publication number Publication date
ES2254375T3 (es) 2006-06-16
IT1315390B1 (it) 2003-02-10
CN1363020A (zh) 2002-08-07
AU4059101A (en) 2001-08-20
ITPD20000039A1 (it) 2001-08-11
DE60116603D1 (de) 2006-04-06
ATE315727T1 (de) 2006-02-15
HK1046946A1 (en) 2003-01-30
WO2001059303A2 (en) 2001-08-16
HK1046946B (zh) 2007-01-19
EP1190177B1 (de) 2006-01-11
CN1233943C (zh) 2005-12-28
WO2001059303A3 (en) 2001-12-20
DE60116603T2 (de) 2006-08-03

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