GB2485344A - Gear pump with connected electric motor cooled or lubricated by working fluid. - Google Patents

Gear pump with connected electric motor cooled or lubricated by working fluid. Download PDF

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Publication number
GB2485344A
GB2485344A GB1018694.8A GB201018694A GB2485344A GB 2485344 A GB2485344 A GB 2485344A GB 201018694 A GB201018694 A GB 201018694A GB 2485344 A GB2485344 A GB 2485344A
Authority
GB
United Kingdom
Prior art keywords
plate
chamber
motor
gear pump
drive
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Withdrawn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
GB1018694.8A
Other versions
GB201018694D0 (en
Inventor
Richard Weatherley
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.)
TCS MICRO Ltd
Original Assignee
TCS MICRO Ltd
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 TCS MICRO Ltd filed Critical TCS MICRO Ltd
Priority to GB1018694.8A priority Critical patent/GB2485344A/en
Publication of GB201018694D0 publication Critical patent/GB201018694D0/en
Publication of GB2485344A publication Critical patent/GB2485344A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/007—General arrangements of parts; Frames and supporting elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
    • F04C11/008—Enclosed motor pump units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/20—Manufacture essentially without removing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2230/00—Manufacture
    • F04C2230/60—Assembly methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rotary Pumps (AREA)

Abstract

A gear pump has a face plate 2 with inlets 6,8 and cooperating with an inner plate 20 defining a pump chamber 21 holding gears 16. The pump chamber 21 is in fluid communication with drive chamber 32 holding the rotor 40 of an electric motor to allow working fluid to lubricate and cool the motor. An O-ring 18 circumscribes the working chamber to seal the face plate 2 to the inner plate and the motor comprises a central plate 24, a stator and a motor plate 34. Tie bolts 44 hold the whole assembly together. Other elements may be sealed using a permanent seal such as glue.

Description

GEAR PUMP
The invention relates to a gear pump.
A gear pump is a type of pump in which two intermeshed gears rotate within a chamber. The teeth of the gears entrain liquid between the gears and the inner surface of the chamber and as the gears rotate pump liquid in the chamber is pumped from an inlet to the chamber to an outlet to the chamber.
Gear pumps can be used in many applications. Of particular interest are applications where long term reliability is required, for example where a pump is to be installed in a location where access is difficult, making service or replacement difficult, or in a consumer product where long term reliability avoids product failure and customer disatisfaction.
There is accordingly a need for gear pumps that are designed for long life.
According to the invention there is provided a gear pump for pumping a pump fluid, comprising: a pump chamber having a first port and a second port, and a pair of gears mounted for rotation in the pump chamber for driving pump fluid from the inlet to the outlet; a motor comprising a rotor and a drive shaft connected to the rotor to drive the pair of gears, the drive shaft and rotor being arranged in a drive chamber, the motor further comprising a stator arranged around the drive chamber; wherein the pump chamber and the drive chamber are in fluid communication to allow pump fluid to pass between them.
In this way, the pump fluid can provide lubrication for the rotor in the drive chamber.
The inventors have realised that it is not necessary to completely seal the chamber of a gear pump from a motor, and that by not doing so the longetivity of the pump can be improved.
In an embodiment, the gear pump includes a face plate having the first port and the second port; an inner plate, the inner plate and the face plate defining the pump chamber between them; a seal around the pump chamber between the inner plate and the face plate, for example an 0-ring, and the inner plate has a central opening within the seal to provide a fluid path between the pump chamber and the drive chamber and wherein the drive shaft passes through the central opening to drive the gears.
In this way, the pump chamber is sealed with a removable seal so that the pump can be manufactured by providing suitable gears and then mounting the face plate to the inner plate and sealing.
A motor plate may be provided on the opposite end of the gear pump to the face plate, the stator being provided between the motor plate and the rotor plate. The stator may be a sealed unit extending around the drive chamber, one end of the drive chamber being sealed by the motor plate and the other end of the drive chamber being externally sealed against the motor plate.
The motor chamber may sealed with a permanent seal, since it is not generally necessary to provide separate access. The permanent seal may be glue.
Screws passing through the motor plate and face plate may be used to compress the motor plate towards the face plate to hold the gear pump together.
Conveniently, the screws may pass longitudinally through flanges extending radially outwards from the inner plate and motor plate.
For a better understanding of the invention, an embodiment will now be described, purely by way of example, with reference to the accompanying drawing, which shows an exploded perspective view.
A face plate 2 is formed to have opposed flanges 4 and through holes 6, 8 which function as ports to the gear pump. Location through holes 14 are provided for location pins 28 which keep the different components of the gear pump in alignment.
An 0-ring seat 10 is formed on the inner face of the face plate 2, together with axle holes 12 for holding axle 26 and drive shaft 48 which support gears 16.
Inner plate 20 has central cutout 22 for holding the gears 16 as well as location through holes 14.
Central plate 24 has a central through hole 26 for the drive shaft 48 as well as location through holes 14 and an axle hole 12 for holding axle 26 supporting one of the gears 16.
Stator 30 is mounted on central plate 24 and is a fully sealed unit arranged as a cylinder around a central drive chamber 32. The stator 30 includes a plurality of electrical coils. Motor plate 34 forms the opposite end of the gear pump to face plate 2 and is provided with flanges 36 with threaded through holes 38.
Rotor 40 is shaped to rotate inside the drive chamber 32 and mounted on bushes 42, one of which is mounted in motor plate 34 and the other of which is in central plate 24.
The gear pump is held together with screws 44 which pass through the flanges 4 on the face plate 2 and screw into the threaded holes 38 on motor plate 34. A pump chamber 21 is formed, sealed by 0-ring 18 in 0-ring seat which defines the lateral extent of the pump chamber 21 and allows the face plate 2 to be assembled separately during manufacture. This allows the use of different gears for different applications.
Inlet 46 and outlet 47 mountings with end fittings for a tube are mounted to connect to inlet and outlet ports 6, 8.
One of the gears 16 is mounted on axle 26, the axle 26 having one end supported on axle hole 12 in the face plate 2 and the other on axle hole 12 in the central plate 24.
The other gear 16 is mounted on the drive shaft 48 which has one end supported on the other axle hole 12 in the face plate 2 and which is connected to the rotor 40.
The face plate 2, inner plate 20 and central plate 24 are kept in alignment by location pins 28 passing through location through holes 14 in those plates.
The motor, i.e. the central plate 24, stator 30 and motor plate 34 are sealed using glue. Further, the central plate 24 is sealed to the inner plate 20 with glue.
In use, the stator 30 is driven electrically to drive rotor 40 which turns the gears 16 in the pump chamber 22 to pump fluid from the inlet to the outlet.
Conventionally, seals have been provided in gear pumps to fully seal the motor from the pump chamber. In the present case however a fully sealed stator 30 is used, the drive chamber 32 in which the rotor 40 sits is sealed by motor plate 34 but there is no seal along drive shaft 48 between the pump chamber 22 and the drive chamber 32.
This allows fluid to enter the drive chamber 32 to act as a lubricant.
The design is arranged for easy manufacture using standard components.
Indeed, the various component parts are commercially available. In particular, the motor formed by the central plate 24, stator 30, drive rotor 40 and motor end plate 34 is commercially available.
Further, the use of glue for the motor to seal inner plate 20, central plate 24, stator 30 and motor plate (34) is cheap and provides an efficient seal while the use of an 0-ring to seal the pump chamber allows for flexible manufacturing with different gears for different applications.
The design delivers a reliable long life by the use of a brushless electric motor.
Those skilled in the art will realise that different components, plates and motors may be substituted for those described above.

Claims (9)

  1. CLAIMS1. A gear pump for pumping a pump fluid, comprising a pump chamber (21) having a first port (6) and a second port (8), and a pair of gears (16) mounted for rotation in the pump chamber for driving pump fluid between the first port (6) and second port (8); a motor comprising a rotor (40) and a drive shaft (48) connected to the rotor to drive the pair of gears, the drive shaft and rotor being arranged in a drive chamber (32), the motor further comprising a stator arranged around the drive chamber (30); wherein the pump chamber (21) and the drive chamber (32) are connected to allow pump fluid to pass between them.
  2. 2. A gear pump according to claim 1, comprising: a face plate (2) having the first port (6) and the second port (8); an central plate (24), the central plate (24) and the face plate (2) defining the pump chamber (21) between them; wherein the central plate (24) has a central opening to provide a fluid path between the pump chamber and the drive chamber and wherein the drive shaft passes through the central opening to drive the gears.
  3. 3. A gear pump according to claim 2 further comprising an inner plate (22) sealed to the face plate with an 0-ring (18).
  4. 4. A gear pump according to claim 2 or 3, further comprising a motor plate (34) on the opposite end of the gear pump to the face plate, the stator (30) being provided between the motor plate (34) and the central plate (24).
  5. 5. A gear pump according to claim 4, wherein the stator (30) is a sealed unit extending around the drive chamber (32), one end of the drive chamber being sealed by the motor plate (34) and the other end of the drive chamber being externally sealed against the central plate (24).
  6. 6. A gear pump according to claim 4 or 5 wherein the central plate (24) and motor plate (34) are sealed to the stator (30) with a permanent seal.
  7. 7. A gear pump according to claim 6 wherein the permanent seal is glue.
  8. 8. A gear pump according to any of claims 4 to 7, further comprising a plurality of screws (44) passing through the motor plate (34) and face plate (2) arranged in tension to hold urge the face plate (2) towards the motor plate (34).
  9. 9. A gear pump according to claim 8 wherein the face plate (2) and the motor plate (34) have flanges (4,36) extending radially outwards from the plate, the screws (44) passing through the flanges.
GB1018694.8A 2010-11-05 2010-11-05 Gear pump with connected electric motor cooled or lubricated by working fluid. Withdrawn GB2485344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1018694.8A GB2485344A (en) 2010-11-05 2010-11-05 Gear pump with connected electric motor cooled or lubricated by working fluid.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1018694.8A GB2485344A (en) 2010-11-05 2010-11-05 Gear pump with connected electric motor cooled or lubricated by working fluid.

Publications (2)

Publication Number Publication Date
GB201018694D0 GB201018694D0 (en) 2010-12-22
GB2485344A true GB2485344A (en) 2012-05-16

Family

ID=43414400

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1018694.8A Withdrawn GB2485344A (en) 2010-11-05 2010-11-05 Gear pump with connected electric motor cooled or lubricated by working fluid.

Country Status (1)

Country Link
GB (1) GB2485344A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825286A (en) * 1957-05-27 1958-03-04 Howard T White Motor driven pumps
US4195971A (en) * 1977-08-08 1980-04-01 Chrysler Corporation Fuel pump and motor assembly
US5725362A (en) * 1995-05-09 1998-03-10 Xolox Corporation Pump assembly
GB2384824A (en) * 2002-01-28 2003-08-06 Visteon Global Tech Inc Bypass/leakage cooling of electric fuel pump
JP2005256733A (en) * 2004-03-11 2005-09-22 Toyota Industries Corp Gear pump
JP2007278229A (en) * 2006-04-10 2007-10-25 Toyota Industries Corp Electric pump
JP2009019522A (en) * 2007-07-10 2009-01-29 Jtekt Corp Electric pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2825286A (en) * 1957-05-27 1958-03-04 Howard T White Motor driven pumps
US4195971A (en) * 1977-08-08 1980-04-01 Chrysler Corporation Fuel pump and motor assembly
US5725362A (en) * 1995-05-09 1998-03-10 Xolox Corporation Pump assembly
GB2384824A (en) * 2002-01-28 2003-08-06 Visteon Global Tech Inc Bypass/leakage cooling of electric fuel pump
JP2005256733A (en) * 2004-03-11 2005-09-22 Toyota Industries Corp Gear pump
JP2007278229A (en) * 2006-04-10 2007-10-25 Toyota Industries Corp Electric pump
JP2009019522A (en) * 2007-07-10 2009-01-29 Jtekt Corp Electric pump

Also Published As

Publication number Publication date
GB201018694D0 (en) 2010-12-22

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Legal Events

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732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20120517 AND 20120523

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