EP0011445A1 - Pumpe - Google Patents

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Publication number
EP0011445A1
EP0011445A1 EP79302505A EP79302505A EP0011445A1 EP 0011445 A1 EP0011445 A1 EP 0011445A1 EP 79302505 A EP79302505 A EP 79302505A EP 79302505 A EP79302505 A EP 79302505A EP 0011445 A1 EP0011445 A1 EP 0011445A1
Authority
EP
European Patent Office
Prior art keywords
pump
sleeve
movable
chamber
fixed
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Withdrawn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
EP79302505A
Other languages
English (en)
French (fr)
Inventor
Ernest William Potter
James Kerslake White
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.)
MILLARS WELLPOINT INTERNATIONAL Ltd
Original Assignee
MILLARS WELLPOINT INTERNATIONAL 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 MILLARS WELLPOINT INTERNATIONAL Ltd filed Critical MILLARS WELLPOINT INTERNATIONAL Ltd
Publication of EP0011445A1 publication Critical patent/EP0011445A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/084—Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular member being deformed by stretching or distortion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/086—Machines, pumps, or pumping installations having flexible working members having tubular flexible members with two or more tubular flexible members in parallel

Definitions

  • This invention relates to pumps capable of pumping at the rate of 10 m 3 /h water containing solid particles such as sand.
  • a pump which can perform this function, which is robust in construction, and is not liable to damage by the solids.
  • Heavy duty pumps commonly have a reciprocating piston or rotary member moving in a metal casing.
  • Diaphragm pumps might solve the problems of wear and sealing but would in general provide an insufficiently high pumping rate.
  • the present invention provides a pump capable of pumping at a rate of 10 m 3 /h water containing solid particles such as sand, the pump comprising a pump chamber of variable volume defined by a fixed end-member, an end-member movable towards and away from the fixed end-member, a flexible sleeve sealingly connected between the end-members, and a piston fixed to the movable end-member and projecting towards the fixed end-member, the fixed end-member having an inlet port and an outlet port each provided with a non-return valve, and mechanical reciprocating means for moving the movable end-member to and from a position at which the volume of the pump chamber is at a minimum and the sleeve is convoluted with at least one outward bulge, the sleeve being of polymeric material, being capable of withstanding an internal pressure of at least 0.5 MPa, and having a life of at least 20 million cycles of reciprocation before failure.
  • the preferred sleeve is of natural or synthetic rubber or a fluorocarbon (e.g. polytetrafluoroethylene).
  • a fluorocarbon e.g. polytetrafluoroethylene
  • the pump is primarily intended for pumping water containing solid particles such as sand, which may be in the form of a slurry (usually containing air), this does not preclude the use of the pump for pumping other fluids.
  • the choice of polymeric material for the sleeve will depend on the range of fluids it is desired to pump.
  • the sleeve is circumferentially reinforced externally (e.g. by rings of metal or plastics material) and/or internally (e.g. by fabric or rings of metal or plastics material).
  • the preferred sleeve is substantially barrel-shaped when the movable end-member is in the second extreme position.
  • the sleeve may have more than one convolution; this also limits the extent to which the sleeve bulges out at the minimum volume of the pump chamber.
  • the distance between the extreme positions of the movable end-member is preferably substantially half the distance between the end-members when the movable one is at its maximum distance from the fixed one. It is preferable for the length of the piston to be substantially equal to the minimum distance between the end-members. This makes the minimum volume of the pump chamber approach zero, thus providing a high ratio of maximum to minimum volume, comparable to that of a conventional piston pump.
  • the pump includes guide means for preventing rocking of the movable end-member during reciprocation, in order to reduce wear of the sleeve.
  • the pump chamber is preferably one of a pair of similar pump chambers whose movable end-members are driven by the reciprocating means in such a way that the volume of one chamber increases as that of the other decreases.
  • the pump illustrated has a pair of variable-volume pump chambers 1.
  • Each chamber 1 is defined by a fixed end-plate 2, a movable end-plate 3, and a resilient synthetic-rubber sleeve 4 circumferentially reinforced with nylon fabric and sealingly connected to the plates 2,3 by clamping means (not shown).
  • the movable plates 3 are rigidly connected by a longitudinal frame 6 which is reciprocated by a reciprocating mechanism which is only shown diagrammatically in Figure 1 and which may be of any convenient conventional type (preferably comprising a crank and a connecting rod).
  • Each movable plate 3 carries a closed, hollow, cylindrical piston 8 which reduces the minimum volume of the pump chamber and thus increases the ratio of maximum to minimum volume.
  • Each fixed plate 2 has an inlet port 11 and an outlet port 12, each provided with a non-return valve (shown diagrammatically) which may be of any convenient conventional type.
  • the left-hand chamber 1 is at its minimum volume and the right-hand chamber 1 is at its maximum volume.
  • the sleeve 4 of the right-hand chamber 1 is at its natural length (i.e. unstressed).
  • each movable plate 3 is provided with upper and lower bearing bosses 13 which run on respective guide bars 14 fixed to the corresponding plate 2.
  • the frame 6 comprises longitudinal bars 7 welded to the movable plates 3. Reciprocation of the frame 6 is caused by a connecting rod 16 whose "big end” 17 is connected to a crankshaft 18 driven by a motor (not shown) and whose "little end” 19 is connected to a pivot pin 20 mounted in the piston 8.
  • the piston 8 is midway between its extreme positions.
  • a pump as described above may be designed to provide a flow of 6000 gal/h (27 m 3 /h), with a suction lift of 9 m and a delivery head of 30 m (equivalent to a pressure of about 0.3 MPa or about 50 p.s.i.), for the purpose of de-watering foundations.
  • the sleeve 4 has to be able to withstand pressures up to at least 0.5 MPa (about 80 p.s.i.) may have a diameter of 150 to 200 mm (in its unstressed state) and a thickness of about 10 mm.
  • the sleeve In order to be able to function for several months without interruption, the sleeve has to have a life expectancy of at least 20 million cycles of reciprocation without failure.
  • the maximum spacing of the plates 2,3 may be 130 mm, and the minimum spacing may be 60 to 70 mm, the reciprocating mechanism being driven by, say, a 6 hp (4.5 kW) motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP79302505A 1978-11-10 1979-11-08 Pumpe Withdrawn EP0011445A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4413578 1978-11-10
GB7844135 1978-11-10

Publications (1)

Publication Number Publication Date
EP0011445A1 true EP0011445A1 (de) 1980-05-28

Family

ID=10500975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302505A Withdrawn EP0011445A1 (de) 1978-11-10 1979-11-08 Pumpe

Country Status (1)

Country Link
EP (1) EP0011445A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718836A (en) * 1984-07-23 1988-01-12 Normetex Reciprocating completely sealed fluid-tight vacuum pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498403A (en) * 1937-07-07 1939-01-09 Cecil Wheatley Stancliffe Improvements in or relating to reciprocating pumps
US2431007A (en) * 1943-12-17 1947-11-18 Charles E Wood Pumping apparatus
US2902944A (en) * 1956-12-14 1959-09-08 Chamberlain Corp Pump
FR1328970A (fr) * 1962-04-21 1963-06-07 Commissariat Energie Atomique Pompe doseuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498403A (en) * 1937-07-07 1939-01-09 Cecil Wheatley Stancliffe Improvements in or relating to reciprocating pumps
US2431007A (en) * 1943-12-17 1947-11-18 Charles E Wood Pumping apparatus
US2902944A (en) * 1956-12-14 1959-09-08 Chamberlain Corp Pump
FR1328970A (fr) * 1962-04-21 1963-06-07 Commissariat Energie Atomique Pompe doseuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4718836A (en) * 1984-07-23 1988-01-12 Normetex Reciprocating completely sealed fluid-tight vacuum pump

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19801023

ITF It: translation for a ep patent filed
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19811126

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WHITE, JAMES KERSLAKE

Inventor name: POTTER, ERNEST WILLIAM