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GB2493360A - Submersible pump with bulkhead between impeller and motor - Google Patents

Submersible pump with bulkhead between impeller and motor Download PDF

Info

Publication number
GB2493360A
GB2493360A GB1113259.4A GB201113259A GB2493360A GB 2493360 A GB2493360 A GB 2493360A GB 201113259 A GB201113259 A GB 201113259A GB 2493360 A GB2493360 A GB 2493360A
Authority
GB
United Kingdom
Prior art keywords
motor
impeller
bulkhead
water
oil seal
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.)
Withdrawn
Application number
GB1113259.4A
Other versions
GB201113259D0 (en
Inventor
Adrian Lester
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1113259.4A priority Critical patent/GB2493360A/en
Publication of GB201113259D0 publication Critical patent/GB201113259D0/en
Publication of GB2493360A publication Critical patent/GB2493360A/en
Withdrawn legal-status Critical Current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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/062—Canned motor pumps pressure compensation between motor- and pump- compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0653—Units comprising pumps and their driving means the pump being electrically driven the motor being flooded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/083—Units comprising pumps and their driving means the pump being electrically driven for submerged use and protected by a gas-bell

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A submersible pump comprises a motor housing d and an impeller housing a, and a bulkhead h there between to create two separate chambers. The bulkhead may have a radial pressure release vent (i, figure 3) joining a central cavity, between a bearing and oil seal of the motor on one side and the bearing and oil seal of the impeller on the other side. The presence of the bulkhead reduces the tendency for water to enter the motor bearings or the rotor and stator which may cause failure. The pressure release vent allows water which has passed the impeller oil seal to exit the bulkhead through a drilled conduit to the exterior of the pump, and therefore not apply pressure on the motor bearings or rotor and stator.

Description

Submersible twin chamber water pump with pressure release vent
Description
Submersible water pump with twin chambers to prevent failure of motor by ingress of water The present invention relates to improvements to water pumps situated under water ("submersible" water pumps).
Existing submersible pumps, such as, for example, the submersible water pump shown in Diagram 1, comprise one chamber for both motor and pump. Such pumps are equipped with a motor housing (a) in which a mains electric motor (b) turns the single main shaft of the pump (c), which in turn runs into the second housing (d) containing the impeller (e) which pumps water by centrifugal force in through the inlet (f) and out through the outlet (g).
Water can pass unimpeded between the two housings, making the pump effectively one chamber. The motor stator is filled with oil for lubrication and heat dissipation in which the stator runs. Water under pressure when the pump is turning (typically 4 to 5 bar) tends to force its way through the oil seals of the motor shaft and into the motor, causing failure of the motor either by contamination and breakdown of the lubricant and or corrosion of the rotor and stator of the motor until they seize by friction. These factors contribute to a poor reliability record of submersible water pumps, with a failure rate of up to 5% in the first few months of use.
The invention (Diagrams 2 and 3) provides for a bulkhead (h) between the motor housing and the pump impeller housing to create two separate chambers, one for the motor and one for the pump impeller. The separation of the chambers reduces the pressure in the motor housing, and therefore at the oil seals, to the ambient water pressure in the tank, typically 0.25 bar.
I
There is greatly reduced tendency for the water to enter the bearings or rotor/stator. The performance of the bulkhead is ensured by the pressure release vent (i), a hole drilled along a radius of the circular bulkhead joining the central cavity, between the bearing and oil seal for the motor on one side and the bearing and oil seal of the impeller on the other side, to the outside of the pump. In the event of partial or total failure of the impeller oil seal, the water under pressure exits the bulkhead chamber through a small conduit drilled from the cavity to the exterior and does not apply pressure on the seal to the motor bearings and rotor/stator.
The bulkhead and the pressure release vent of this invention render the submersible pump much more reliable and enable it to be guaranteed for use over periods of years.
Other details of the submersible water pump which may or may not be incorporated into a design, such as pressure-sensitive on-demand water supply and dry-run protection, are not affected by the invention and do not form part of this application. Claim

Claims (1)

  1. <claim-text>What I claim is:- 1) First claim: Apparatus comprising a submersible pump provided with a bulkhead between the motor housing and the pump impeller housing, thereby creating two separate chambers, one for the motor and one for the impeller, which reduce the water pressure in the motor housing to the ambient water pressure in the tank, not the pressure on the impeller side, and which reduces the tendency for the water to enter the bearings or rotor/stator and cause the failure f the motor.</claim-text> <claim-text>2) Second claim: Apparatus according to the first claim fitted also with a pressure release vent, a hole drilled along a radius of the circular bulkhead joining the central cavity, between the bearing and oil seal for the motor on one side and the bearing and oil seal of the impeller on the other side, to the outside of the pump, in a manner in which, in the event of failure of the impeller oil seal, the water under pressure exits the bulkhead chamber through a small conduit drilled from the cavity to the exterior and does not apply pressure on the seal to the motor bearings and rotor/stator.</claim-text>
GB1113259.4A 2011-08-02 2011-08-02 Submersible pump with bulkhead between impeller and motor Withdrawn GB2493360A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1113259.4A GB2493360A (en) 2011-08-02 2011-08-02 Submersible pump with bulkhead between impeller and motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1113259.4A GB2493360A (en) 2011-08-02 2011-08-02 Submersible pump with bulkhead between impeller and motor

Publications (2)

Publication Number Publication Date
GB201113259D0 GB201113259D0 (en) 2011-09-14
GB2493360A true GB2493360A (en) 2013-02-06

Family

ID=44676554

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1113259.4A Withdrawn GB2493360A (en) 2011-08-02 2011-08-02 Submersible pump with bulkhead between impeller and motor

Country Status (1)

Country Link
GB (1) GB2493360A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104535266A (en) * 2014-12-23 2015-04-22 安德里茨（中国）有限公司 Clamp for sub-cavity pressure-resistant test of multi-cavity pump body

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1058433A (en) * 1964-04-28 1967-02-08 Daimler Benz Ag Improvements relating to the ventilation of electrical machines and electrically driven machines liable to submergence
GB1101048A (en) * 1964-04-01 1968-01-31 Clinton Rule Impeller pumps for liquids
GB1314651A (en) * 1970-03-24 1973-04-26 Blum A Submersible electric motor-pump assemblages
GB1428445A (en) * 1972-09-09 1976-03-17 Frankl & Kirchner Pump units
FR2345604A1 (en) * 1976-07-16 1977-10-21 Uwe Unterwasser Electric Gmbh Swimming pool filtration unit - has filter and jet immersed with motor in liquid tight compartment separate from pump
GB2135731A (en) * 1983-02-17 1984-09-05 Graziella Freschi Submersible pumps
JP2003082724A (en) * 2001-09-05 2003-03-19 Dmw Corp Sewage force feed device
JP2009103110A (en) * 2007-10-25 2009-05-14 Shin Meiwa Ind Co Ltd Underwater pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1101048A (en) * 1964-04-01 1968-01-31 Clinton Rule Impeller pumps for liquids
GB1058433A (en) * 1964-04-28 1967-02-08 Daimler Benz Ag Improvements relating to the ventilation of electrical machines and electrically driven machines liable to submergence
GB1314651A (en) * 1970-03-24 1973-04-26 Blum A Submersible electric motor-pump assemblages
GB1428445A (en) * 1972-09-09 1976-03-17 Frankl & Kirchner Pump units
FR2345604A1 (en) * 1976-07-16 1977-10-21 Uwe Unterwasser Electric Gmbh Swimming pool filtration unit - has filter and jet immersed with motor in liquid tight compartment separate from pump
GB2135731A (en) * 1983-02-17 1984-09-05 Graziella Freschi Submersible pumps
JP2003082724A (en) * 2001-09-05 2003-03-19 Dmw Corp Sewage force feed device
JP2009103110A (en) * 2007-10-25 2009-05-14 Shin Meiwa Ind Co Ltd Underwater pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104535266A (en) * 2014-12-23 2015-04-22 安德里茨（中国）有限公司 Clamp for sub-cavity pressure-resistant test of multi-cavity pump body
CN104535266B (en) * 2014-12-23 2017-01-25 安德里茨（中国）有限公司 Clamp for sub-cavity pressure-resistant test of multi-cavity pump body

Also Published As

Publication number Publication date
GB201113259D0 (en) 2011-09-14

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)