Source: https://patents.google.com/patent/US4640666A/en
Timestamp: 2019-11-16 23:08:54
Document Index: 58882829

Matched Legal Cases: ['art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5', 'art 5']

US4640666A - Centrifugal pump - Google Patents
Centrifugal pump Download PDF
US4640666A
US4640666A US06/751,472 US75147285A US4640666A US 4640666 A US4640666 A US 4640666A US 75147285 A US75147285 A US 75147285A US 4640666 A US4640666 A US 4640666A
US06/751,472
Bengt Sodergard
1982-10-11 Priority to SE8205774 priority Critical
1982-10-11 Priority to SE8205774A priority patent/SE444969B/en
1985-07-03 Application filed by International Standard Electric Corp (ISEC) filed Critical International Standard Electric Corp (ISEC)
1986-11-07 Assigned to ITT INDUSTRIES, INC. reassignment ITT INDUSTRIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE. CORP.
1987-02-03 Publication of US4640666A publication Critical patent/US4640666A/en
1988-08-20 First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20348163&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US4640666(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
2004-02-03 Anticipated expiration legal-status Critical
238000005520 cutting process Methods 0 abstract claims description 32
238000005086 pumping Methods 0 abstract claims description 5
F04D29/2288—Rotors specially for centrifugal pumps with special measures for comminuting, mixing or separating
The invention concerns a centrifugal pump for pumping heavily polluted liquids. The impeller is provided with an inlet having cutting means cooperating with an inlet opening of the pump housing, which cutting means cut elongated bodies, such as rags before they get into the pump housing.
This application is a continuation of application Ser. No. 535,109, filed Sept. 23, 1983, now abandoned.
This invention concerns a centrifugal pump for pumping liquids containing solid bodies, such as rags and other elongated objects.
The centrifugal pump which draws in the liquid at its center and throws it outwardly in the peripheral direction has good abilities when pumping fairly clean liquids. If the liquid contains solid bodies, however, the problem occurs that these may be stuck between the impeller and the surrounding pump housing and cause a stop or at least a decreased pumping ability.
A method to solve these problems is to design the pump so that the impeller rotates beside the liquid flow, a so-called vortex impeller. The stopping problems are mainly solved by this design, but other disadvantages, such as a decreasing efficiency, occur.
Another method to solve the problem is to arrange some sort of a cutting means in front of the impeller which cuts rags and such things so they become possible to pump. An example of such a construction is shown in U.S. Pat. No. 4,108,386.
In this known design the front end of the impeller is provided with two cutting means, which cooperate with the inlet of the pump housing for cutting up the pollutants. This construction, however, does not work satisfactorily due to the fact that the underpressure prevailing in the pump inlet causes an incoming rag to be drawn into the impeller center. Smaller rags may then rotate with the impeller and never make contact with the cutting means. Bigger rags may bring about an increasing rotation opposition which can stop the pump.
In general, it is an object of the present invention to avoid the disadvantages of the prior art.
It is a further object of the present invention to provide a pump having an impeller which is designed to avoid clogging by solid objects such as rags and other elongated objects.
In pursuance of these objects, one feature of the present invention resides in the provision of a pump comprising a pump housing having an internal surface bounding a central inlet and provided with grooves and an impeller having at least a portion received in the inlet for rotation therein, the portion being substantially cylindrical and having a diameter which is smaller than that of the inlet, the portion having substantially axially extending cutting means which project radially from the portion to cooperate with the grooves to cut solid objects such as rags and other elongated objects.
Above-mentioned and other features and objects of the invention will become more apparent by reference to the following description taken in conjunction with the accompanying drawing in which:
FIG. 1 shows a sectional view of the invention seen radially.
FIG. 2 shows the invention from an axial direction.
FIG. 3 shows a perspective view of an inlet part of an impeller according to the invention.
In the Figures, a pump housing 1 has an inlet opening 2 provided with grooves 3. A centrifugal impeller 4 is provided with an inlet part 5, primary cutting means 6, secondary cutting means 7 and projections 8. The inlet part 5 of the impeller 4 is cylindrical and projects down into the inlet opening 2 of the housing 1. On the periphery of the inlet part 5 there are provided the cutting means 6, preferably including two cutting portions which are arranged essentially axially and somewhat inclined towards the projections 8 and project up to the edge of the inlet opening 2. The cutting means 6 cooperates with the axially directed grooves 3 in the inlet opening 2, causing any solid objects such as rags and other elongated objects which may be included in the medium and constituting pollutants of such medium to be cut in the area between the inlet part 5 and the inlet opening 2. Intermediate the cutting means there is a distance between the periphery of the inlet part 5 and the inlet opening 2, which decreases the risk of development of underpressure at the impeller center which, if permitted to develop, would have certain disadvantages mentioned above. The radius of the inlet part 5 is about 75-95%, preferably 80-85%, of the radius of the inlet opening 2. A larger distance could mean that a plurality of pollutants could contact the cutting means 6 at the same time.
Some portions of the inlet part 5 project a distance outside the inlet opening 2. These portions or projections 8 are rounded as are the sections between them, giving the front surface of the inlet part 5 a wave form. The projections 8 are preferably arranged axially in front of the cutting means 6 as considered in the direction of flow, but may also be arranged in some other way.
The purpose of the projections 8 is primarily to create a flow pattern in front of the impeller 4 which prevents rags or other elongated objects constituting the pollutants from being drawn into the center of the impeller and directs them towards the cutting means 6 arranged at the periphery of the impeller 4.
In order to obtain further dispersion of the pollutants which have been cut by the above-mentioned cutting means 6, there is preferably further provided a number of secondary cutting portions together constituting secondary cutting means 7 which projects up to the edge of the inlet opening 2.
According to the invention there is thus obtained a cutting device for centrifugal pumps which in a simple and effective way disintegrates pollutants in the pumped medium, without engendering the risks for clogging from which the prior known devices have suffered. In the description above, an embodiment with two primary cutting portions constituting the cutting means 6 has been described. However, if larger impeller diameters are being used, it is possible to use an increased number of cutting portions constituting cutting means 6 and a larger number of projections 8, all within the scope of the invention.
1. A centrifugal pump for pumping liquids containing solid objects, such as rags and other elongated objects, comprising
a pump housing having an internal surface bounding an inlet opening and provided with grooves; and
an impeller having a part thereof received in said inlet opening for rotation therein, said part having a substantially cylindrical outer circumferential surface which is spaced a distance from said internal surface to form a slot therebetween to reduce underpressure at the center of the impeller, a primary cutting means having at least two substantially axially extending cutting portions on said part projecting radially outwardly from the said cylindrical surface, each of said primary cutting portions having a surface inclined relative to the longitudinal axis of said impeller which cooperates with edges of said internal surface which forms said grooves to cut the objects, at least one secondary cutting means having a surface projecting radially outwardly from said substantially cylindrical outer circumferential surface and up to one edge of said central inlet opening and cooperating with the edges of said internal surface which forms said grooves to cut the objects, and a projection extending axially outside of said inlet opening from each of said primary cutting portions to create a flow pattern to direct the solid objects to said primary cutting portions.
2. The pump of claim 1 wherein each of said projections is rounded.
3. The pump of claim 1 wherein said secondary cutting means extends over a shorter axial distance than said primary cutting means.
4. The pump of claim 1 wherein said outer diameter of said part is 75-95% of that of said inlet.
5. The pump of claim 4 wherein said outer diameter of said part is 80-95% of that of said inlet.
US06/751,472 1982-10-11 1985-07-03 Centrifugal pump Expired - Lifetime US4640666A (en)
SE8205774 1982-10-11
SE8205774A SE444969B (en) 1982-10-11 1982-10-11 Centrifugal pump for pumping avseddd vetskor CONTAINING solids
US06535109 Continuation 1983-09-23
US4640666A true US4640666A (en) 1987-02-03
ID=20348163
US06/751,472 Expired - Lifetime US4640666A (en) 1982-10-11 1985-07-03 Centrifugal pump
US (1) US4640666A (en)
EP (1) EP0120178B1 (en)
JP (1) JPS6250675B2 (en)
AU (1) AU564171B2 (en)
BR (1) BR8305511A (en)
CA (1) CA1224084A (en)
DE (1) DE3374889D1 (en)
DK (1) DK158845C (en)
FI (1) FI73794C (en)
NO (1) NO156339C (en)
SE (1) SE444969B (en)
US4911368A (en) * 1988-03-25 1990-03-27 Ebara Corporation Grinder pump
US5011370A (en) * 1989-04-27 1991-04-30 Itt Corporation Centrifugal pump
US5016825A (en) * 1990-02-14 1991-05-21 Mcneil (Ohio) Corporation Grinding impeller assembly for a grinder pump
EP0475920A1 (en) * 1990-09-12 1992-03-18 ITT Flygt Aktiebolag Clog resistant pump
US5451004A (en) * 1993-09-08 1995-09-19 Somat Corporation Integrated waste pulping and liquid extraction system
US5577674A (en) * 1993-09-08 1996-11-26 Somat Corporation Waste pulping and liquid extraction system and method including automatic bag feeding
WO2002101245A1 (en) * 2001-06-13 2002-12-19 Weir Warman Ltd Apparatus for use in slurry pumps
EP1270952A2 (en) * 2001-06-19 2003-01-02 Ohta Patent Office Stirring pump
EP1344944A1 (en) * 2002-03-14 2003-09-17 KSB Aktiengesellschaft Centrifugal pump with crushing device
US20040035961A1 (en) * 2000-07-25 2004-02-26 Ibanez Santiago Gimenez Sanitary shredder
US7159806B1 (en) 2005-01-18 2007-01-09 Ritsema Stephen T Cutter assembly for a grinder pump
US20070048158A1 (en) * 2005-08-24 2007-03-01 Metropolitan Industries, Inc. Low Profile Pump
US20090169365A1 (en) * 2005-06-17 2009-07-02 Itt Manufacturing Enterprises Inc. Pump
US20100003124A1 (en) * 2008-07-05 2010-01-07 Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg Pump with Cutting Impeller and Pre-Cutter
EP2586531A2 (en) 2011-10-26 2013-05-01 Alfredo Angelo Ciotola Cutter assembly and high volume submersible shredder pump
CN101571135B (en) 2008-04-30 2013-05-29 Ksb股份公司 Centrifugal pump with crushing device
US9409183B2 (en) 2012-07-30 2016-08-09 Weir Minerals Australia, Ltd. Pump and submersible solids processing arrangement
US10087946B2 (en) 2016-02-09 2018-10-02 Brunswick Corporation Centrifugal pumps having anti-air-locking features
US10364821B2 (en) 2017-01-16 2019-07-30 Liberty Pumps, Inc. Grinder pump and cutting assembly thereof
JPS6235910Y2 (en) * 1984-08-17 1987-09-11
JPS6310287U (en) * 1986-07-07 1988-01-23
JPH0567799B2 (en) * 1987-02-25 1993-09-27 Tsurumi Mfg
JPH0792073B2 (en) * 1987-06-30 1995-10-09 株式会社鶴見製作所 Grinder pump
JPH064071Y2 (en) * 1987-07-28 1994-02-02 株式会社鶴見製作所 Grinder - pump
JPH0231395U (en) * 1988-08-18 1990-02-27
JPH061078B2 (en) * 1989-05-01 1994-01-05 株式会社鶴見製作所 Grinder pump
DE4128281A1 (en) * 1991-08-27 1993-03-04 Abs Pumpen Ag Pump for handling domestic sewage - has disc with cutting blades arranged in front of pump inlet
US20050067295A1 (en) * 2003-09-25 2005-03-31 Dory Thomas S. Deep via seed repair using electroless plating chemistry
US3560106A (en) * 1969-02-13 1971-02-02 Nils Johan Sahlstrom Slurry handling pump
US3961758A (en) * 1974-08-23 1976-06-08 Peabody Barnes, Inc. Centrifugal pump with integral grinder
US4108386A (en) * 1977-04-13 1978-08-22 Mcneil Corporation Grinder pump
US4222528A (en) * 1978-12-13 1980-09-16 Arthur Smith Mill
JPS5838396A (en) * 1981-08-29 1983-03-05 Ebara Corp Grinder pump
US4378093A (en) * 1980-12-11 1983-03-29 Keener Steven M Grinder pump cutter assembly
US4402648A (en) * 1981-08-31 1983-09-06 A. O. Smith Harvestore Products, Inc. Chopper pump
GB1425821A (en) * 1971-12-11 1976-02-18 Wallwin Pumps Ltd Comminutor
GB2077606B (en) * 1980-06-11 1984-06-06 Haigh Eng Co Ltd Macerator pumping impeller
1982-10-11 SE SE8205774A patent/SE444969B/en not_active IP Right Cessation
1983-09-06 FI FI833171A patent/FI73794C/en not_active IP Right Cessation
1983-09-20 DE DE19833374889 patent/DE3374889D1/en not_active Expired
1983-09-20 EP EP19830850253 patent/EP0120178B1/en not_active Expired
1983-10-05 NO NO833617A patent/NO156339C/en not_active IP Right Cessation
1983-10-05 BR BR8305511A patent/BR8305511A/en not_active IP Right Cessation
1983-10-07 CA CA000438606A patent/CA1224084A/en not_active Expired
1983-10-10 AU AU20009/83A patent/AU564171B2/en not_active Ceased
1983-10-10 DK DK464983A patent/DK158845C/en not_active IP Right Cessation
1983-10-11 JP JP58189784A patent/JPS6250675B2/ja not_active Expired
1985-07-03 US US06/751,472 patent/US4640666A/en not_active Expired - Lifetime
US4454993A (en) * 1981-08-29 1984-06-19 Ebara Corporation Grinder pump
AU645341B2 (en) * 1990-09-12 1994-01-13 Itt Flygt Ab Clog resistant pump
WO1998025031A3 (en) * 1996-12-03 1998-11-26 Paul V Cooper Molten metal pumping device
US6969018B2 (en) * 2000-07-25 2005-11-29 Societe Etex De Recherches Techniques Sanitary shredder
US6951445B2 (en) 2001-06-13 2005-10-04 Weir Warman Ltd Apparatus for use in slurry pumps
US20040146416A1 (en) * 2001-06-13 2004-07-29 Burgess Kevin Edward Apparatus for use in slurry pumps
EP1270952A3 (en) * 2001-06-19 2004-01-07 Ohta Patent Office Stirring pump
CN1293308C (en) * 2001-06-19 2007-01-03 东洋电机工业所股份有限公司 Stirring pump in water
US8109730B2 (en) * 2005-06-17 2012-02-07 Itt Manufacturing Enterprises, Inc. Pump for contaminated liquid
US8186975B2 (en) * 2005-08-24 2012-05-29 Metropolitan Industries, Inc. Low profile pump with first and second rotor arrangement
US8267643B2 (en) * 2008-07-05 2012-09-18 Brinkmann Pumpen K.H. Brinkmann Gmbh & Co. Kg Pump with cutting impeller and pre-cutter
US8784038B2 (en) 2011-10-26 2014-07-22 Alfredo A. Ciotola Cutter assembly and high volume submersible shredder pump
DK158845C (en) 1991-01-14
SE8205774L (en) 1984-04-12
FI833171A (en) 1984-04-12
FI73794C (en) 1987-11-09
SE8205774D0 (en) 1982-10-11
DK464983A (en) 1984-04-12
FI73794B (en) 1987-07-31
DE3374889D1 (en) 1988-01-21
NO833617L (en) 1984-04-12
NO156339C (en) 1987-09-02
DK464983D0 (en) 1983-10-10
CA1224084A1 (en)
NO156339B (en) 1987-05-25
CA1224084A (en) 1987-07-14
JPS6250675B2 (en) 1987-10-26
FI833171A0 (en) 1983-09-06
BR8305511A (en) 1984-05-15
AU2000983A (en) 1984-04-19
EP0120178B1 (en) 1987-12-09
SE444969B (en) 1986-05-20
DK158845B (en) 1990-07-23
EP0120178A1 (en) 1984-10-03
AU564171B2 (en) 1987-08-06
FI833171D0 (en)
JPS5990793A (en) 1984-05-25
US3044408A (en) 1962-07-17 Rotary pump
US2165808A (en) 1939-07-11 Pump rotor
CA1270696A (en) 1990-06-26 Combined fluidizing and vacuum pump
US6190121B1 (en) 2001-02-20 Centrifugal pump with solids cutting action
US5470201A (en) 1995-11-28 Molten metal pump with vaned impeller
CA1086454A (en) 1980-09-30 Grinder pump
US3732032A (en) 1973-05-08 Centrifugal pumps
US3650481A (en) 1972-03-21 Grinder pump
EP0252037A1 (en) 1988-01-07 A seal device
US4378093A (en) 1983-03-29 Grinder pump cutter assembly
EP0168251B1 (en) 1989-09-13 Apparatus for immersing solids into fluids and moving fluids in a linear direction
US3130678A (en) 1964-04-28 Centrifugal pump
US2581828A (en) 1952-01-08 Pump
US4921400A (en) 1990-05-01 Pump and a method of separating gas by such from a fluid to be pumped
CN1108457C (en) 2003-05-14 Pump vane
US4063849A (en) 1977-12-20 Non-clogging, centrifugal, coaxial discharge pump
US7037069B2 (en) 2006-05-02 Impeller and wear plate
Owner name: ITT INDUSTRIES, INC., 320 PARK AVENUE, NEW YORK, N
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A DE. CORP.;REEL/FRAME:004623/0892