US3186345A - Means for preventing or limiting interchange of liquids between communicating vessels - Google Patents

Means for preventing or limiting interchange of liquids between communicating vessels Download PDF

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Publication number
US3186345A
US3186345A US275129A US27512963A US3186345A US 3186345 A US3186345 A US 3186345A US 275129 A US275129 A US 275129A US 27512963 A US27512963 A US 27512963A US 3186345 A US3186345 A US 3186345A
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United States
Prior art keywords
chamber
pump
motor
liquid
annular passage
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Expired - Lifetime
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US275129A
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English (en)
Inventor
Ivanoff Victor
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.)
Hayward Tyler and Co Ltd
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Hayward Tyler and Co Ltd
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Filing date
Publication date
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Publication of US3186345A publication Critical patent/US3186345A/en
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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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals

Definitions

  • the pump chamber When a unit of the type defined is used for pumping liquids at high temperature, the pump chamber is filled with hot liquid which tends to be carried by convection currents through the annular gap up to the motor chamber. Apart from the danger of over heating of the motor which is involved, the heat losses can, in large installations, amount to tens of horsepower.
  • an external coiling system hot liquid being tapped off from the lower end of the motor chamber, cooled, and passed back to the casing at the upper end of the motor chamber. The circulation of liquid through the external cooling system is forced by an auxiliary impeller carried at the upper end of the motor shaft.
  • the unit may, however, be required for hot stand-by duty, that is to say it may be immersed in the liquid, so that the liquid fills the casing, in readiness for immediate use in the event of the failure of another pump.
  • the motor shaft is stationary and so the auxiliary impeller is not operative to provide a forced circulation of liquid through the external cooling system, and the liquid in the motor chamber tends to become heated by convection.
  • the present invention provides means for limiting the interchange by convection of the relatively hot liquid in the lower, pump chamber and the relatively cool liquid in the upper, motor chamber.
  • a submersible electric motor pump unit of the type herein defined in which there is provided, at one end of the annular passage, a liquid trap or labyrinth including a downwardly directed wall surrounding the mouth of the passage, the arrangement being such that in order to pass from the lower chamber to the upper chamber through the annular passage, liquid must pass downwardly below the lower edge of the said wall.
  • the electric motor pump unit shown in the drawing comprises a casing in three parts, an upper portion 1 defining a motor chamber, a lower portion 2 defining a pump chamber and a relatively narrow neck portion 3 connecting the upper and lower portions.
  • a shaft 4 common to the motor and the pump, carries the motor rotor at its upper end, for co-operation with stator windings mounted within the upper casing portion 1.
  • the shaft extends with clearance through the neck portion 3, so that an annular passage 5 is defined between the shaft and the neck, and at its lower end, within the pump chamber,
  • the shaft carries a pump impeller 6.
  • the pump chamber is provided with the usual inlet 7 and outlet 8.
  • a labyrinth comprising a generally bell shaped member 11 concentric with and surrounding the shaft, with its mouth facing the adjacent upper end of the passage 5.
  • a tubular baflle 12 is mounted at the upper end of the annular passage 5 so as to form an upward extension thereof, and extends into the bell although spaced therefrom, with its upper edge at a higher level than the lower edge of the bell.
  • This trap or labyrinth arrangement can be inverted by providing a second labyrinth comprising an inverted bell 13 on the shaft 4 adjacent the lower end of the passage 5, and a downwardly extending tubular baffle 14 at the lower end of the passage.
  • a second labyrinth comprising an inverted bell 13 on the shaft 4 adjacent the lower end of the passage 5, and a downwardly extending tubular baffle 14 at the lower end of the passage.
  • layers 11A, 13A, 12A and 14A, of heat insulating material, such as impregnated asbestos, are provided on appropriate surfaces of the bells and the bafiles, respectively.
  • the layers are held in place by layers of metal cladding 11B, 13B, 12B
  • liquid trap arrangements described above can be provided at either the lower end or the upper end of the annular passage 5, but they are preferably provided at both ends, as described and illustrated.
  • a submersible electric motor and pump assemblage for pumping liquid comprising a housing .including a pump chamber, a motor chamber and a tubular neck portion joining the pump chamber and the motor chamber, a rotary pump within the pump chamber and an electric motor within the motor chamber, said motor having a drive shaft extending through said neck portion -with clearance to define an annular passage connecting the two chambers and coupled to the pump for rotating the same, said pump chamber having an inlet and an outlet for liquid to be pumped, the liquid flooding both chambers and the annular passage in the submersed condition of the assemblage, and a labyrinth means adjacent to one end of said annular passage, said labyrinth means inhibiting an upward flow of convection currents from the pump chamber towards the motor chamber by constraining said current to flow along a tortuous path exposing the same to a cooling action by liquid in the motor chamber prior to entering said motor chamber.
  • a submersible electric motor and pump assemblage for pumping liquid comprising a housing including a pump chamber, a motor chamber and a tubular neck portion joining the pump chamber and the motor chamber, a rotary pump within the pump chamber and an electric motor within the motor chamber, said motor having a drive shaft extending through said neck portion with clearance to define an annular passage connecting the two chambers and coupled to the pump for rotating the same, said pump chamber having an inlet and an outlet for liquid to be pumped, the liquid flooding both chambers and the annular passage in the submersed condition of the assemblage, and a labyrinth means adjacent to one end of said annular passage, said labyrinth means including a bell-shaped member disposed in the motor chamber adjacent to the respective end of the annular passage in lengthwise alignment therewith, said bell-shaped member being surrounded by' and filled with liquid in the motor chamber, the open side of the bell-shaped member facing towards said passage to inhibit an upward flow of convection currents by guiding said currents through said passage at least partly into
  • a submersible electric motor and pump assemblage for pumping liquid comprising a housing including a pump chamber, a motor chamber and a tubular neck portion joining the pump chamber and the motor chamber, a rotary pump within the pump chamber and an electric motor within the motor chamber, said motor having a drive shaft extending through said neck portion with clearance to define an annular passage connecting the two chambers and coupled to the pump for rotating the same, said pump chamber having an inlet and an outlet for liquid to be pumped, the liquid flooding both chambers and the annular passage in the submersed condition of the assemblage, and a labyrinth means adjacent to one end of said annular passage, said labyrinth means including a bell-shaped member disposed in the motor chamber coaxial with the said shaft sealed thereto, the open side of said bell-shaped member facing toward said annular passage, said bell-shaped member being surrounded by and filled with liquid in the motor chamber, and a tubular bafi'le forming an extension of said annular passage within the motor chamber and extending into the open
  • a submersible electric motor and pump assemblage for pumping liquid comprising a housing including a pump chamber, a motor chamber and a tubular neck portion joining the pump chamber and the motor chamber, a rotary pump within the pump chamber and an electric motor within the motor chamber, said motor having a drive shaft extending through said neck portion with clearance to define an annular passage connecting 4 the two chambers and coupled to the pump for rotating the same, said pump chamber having an inlet and an outlet for liquid to be pumped, the liquid flooding both chambers and the annular passage in the submersed condition of the assemblage, and a labyrinth means in each chamber adjacent to the respective end of said annular passage, each of said labyrinth means inhibiting an upward flow of convection currents from one chamber to the other through said passage by constraining said currents to flow along a tortuous path prior to entering and leaving the respective chamber.
  • a submersible electric motor and pump assemblage for pumping liquid comprising a housing including a pump chamber, a motor chamber and a tubular neck portion joining the pump chamber and the motor chamber, a rotary pump within the pumpchamber and an electric motor within the motor chamber, said motor having a drive shaft extending through said neck portion with clearance to define an annular passage connecting the two chambers and coupled to the pump for rotating the same, said pump chamber having an inlet and an outlet for liquid to be pumped, the liquid flooding both chambers and the annular passage in the submersed condition of the assemblage, and a labyrinth means in each chamber adjacent to the respective end of said annular passage, each of said labyrinth means including a bellshaped member disposed in the respective chamber coaxial with said shaft sealed thereto, the open side of each of said bell-shaped members facing toward said annular passage, each of said bell-shaped members being surrounded by and filled with liquid in therespective chamber, and a tubular bafile forming an extension of said annular passage within the respective

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US275129A 1962-04-26 1963-04-23 Means for preventing or limiting interchange of liquids between communicating vessels Expired - Lifetime US3186345A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15950/62A GB993668A (en) 1962-04-26 1962-04-26 Improvements in or relating to electric motor and pump units

Publications (1)

Publication Number Publication Date
US3186345A true US3186345A (en) 1965-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
US275129A Expired - Lifetime US3186345A (en) 1962-04-26 1963-04-23 Means for preventing or limiting interchange of liquids between communicating vessels

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US (1) US3186345A (fr)
CH (1) CH406857A (fr)
DE (1) DE1528865A1 (fr)
GB (1) GB993668A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910585A (en) * 1972-11-07 1975-10-07 Cnen Hydraulic multicellular sealing device for centrifugal pumps
US4236721A (en) * 1978-03-01 1980-12-02 B.V. Neratoom Sealing bushing
US4743197A (en) * 1987-05-08 1988-05-10 Allegheny Ludlum Corporation High temperature fan plug apparatus
US5232350A (en) * 1991-06-11 1993-08-03 Maytag Corporation Motor driven pump assembly with a protective cover
US5503523A (en) * 1993-11-16 1996-04-02 Deutsche Babcock-Borsig Aktiengesellschaft Transmission-driven compressor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1346924A (en) * 1919-06-13 1920-07-20 Arthur R Wilfley Centrifugal pump
US2381823A (en) * 1942-04-17 1945-08-07 Bour Harry E La Liquid sealed pump
US2677328A (en) * 1949-12-30 1954-05-04 Gen Electric Centrifugal pump for high temperature liquids

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1346924A (en) * 1919-06-13 1920-07-20 Arthur R Wilfley Centrifugal pump
US2381823A (en) * 1942-04-17 1945-08-07 Bour Harry E La Liquid sealed pump
US2677328A (en) * 1949-12-30 1954-05-04 Gen Electric Centrifugal pump for high temperature liquids

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910585A (en) * 1972-11-07 1975-10-07 Cnen Hydraulic multicellular sealing device for centrifugal pumps
US4236721A (en) * 1978-03-01 1980-12-02 B.V. Neratoom Sealing bushing
US4743197A (en) * 1987-05-08 1988-05-10 Allegheny Ludlum Corporation High temperature fan plug apparatus
US5232350A (en) * 1991-06-11 1993-08-03 Maytag Corporation Motor driven pump assembly with a protective cover
US5503523A (en) * 1993-11-16 1996-04-02 Deutsche Babcock-Borsig Aktiengesellschaft Transmission-driven compressor

Also Published As

Publication number Publication date
GB993668A (en) 1965-06-02
CH406857A (fr) 1966-01-31
DE1528865A1 (de) 1969-10-30

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