EP1113174A2 - Doppelmembranpumpe - Google Patents

Doppelmembranpumpe Download PDF

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Publication number
EP1113174A2
EP1113174A2 EP00311302A EP00311302A EP1113174A2 EP 1113174 A2 EP1113174 A2 EP 1113174A2 EP 00311302 A EP00311302 A EP 00311302A EP 00311302 A EP00311302 A EP 00311302A EP 1113174 A2 EP1113174 A2 EP 1113174A2
Authority
EP
European Patent Office
Prior art keywords
central element
compartments
diaphragm pump
double diaphragm
diaphragms
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Withdrawn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
EP00311302A
Other languages
English (en)
French (fr)
Other versions
EP1113174A3 (de
Inventor
Derek Noel Marchant
Lewis Hunt Norris
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.)
Flotronic Pumps Ltd
Original Assignee
Flotronic Pumps 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 Flotronic Pumps Ltd filed Critical Flotronic Pumps Ltd
Publication of EP1113174A2 publication Critical patent/EP1113174A2/de
Publication of EP1113174A3 publication Critical patent/EP1113174A3/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Withdrawn legal-status Critical Current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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/08—Cooling; Heating; Preventing freezing
    • 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
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel

Definitions

  • This invention relates to double-diaphragm pumps and particularly to improved body design for such pumps.
  • Double-diaphragm pumps are known and described in EP-B 0 181 756 and EP 0 132 913.
  • the pumps described in these documents have a central body which separates two inner chamber members that form, in conjunction with a pair of flexible diaphragms, the inner portions of two pumping chambers.
  • the central body of the illustrated pumps contains a fluid operate valve system which controls the flow of pumped fluid to and from the inner portions of the pumping chambers.
  • Such pumps have the advantage over many other types of pumps that they can easily be installed "in line” into fluid transmission systems and the inlet and outlet manifolds are kept short.
  • an appreciable residue of fluid remains within the pump body and must be removed by dismantling the pump or other means which results in the loss or contamination of the residual fluid. In the case of high value fluids such loss is unacceptable economically.
  • the present invention provides a double-diaphragm pump in which the fluid loss, when draining the pump, is greatly reduced, and the overall dimensions are less than those of known pumps having similar pumping capacity.
  • a double diaphragm pump comprises a pair of axially spaced apart pumping chambers, each chamber having a pumping diaphragm to divide each chamber into an inner and an outer compartment, the outer end of each pumping chamber being closed by an end cover and the inner ends of both pumping chambers being closed by a central element, connection means extending between the diaphragms and through the central element, means for supplying operating fluid to the outer compartments to cause the diaphragms to oscillate and vary the capacities of the inner compartments, and each of the inner compartments having an inlet and outlet port leading to unidirectional valves to allow fluid to be drawn into one of the compartments when the appropriate diaphragm moves outwardly and expelled from that compartment when the diaphragm moves inwardly and in which the central element has a unitary partition wall which extends between and closes the inner ends of the inner compartments, said wall being substantially solid over a major portion of its area apart from a sealing aperture to allow the connection means to pass through
  • the opposed surfaces of the substantially solid part of the unitary wall are substantially parallel.
  • the opposed surfaces of the central element which form part of the inner chambers are of substantially overall concave shape.
  • the end covers can be of arcuate section and the edges of the diaphragms are held and located between the end covers and the central element.
  • the end covers may be substantially conical or, more preferably, of convexly curved form.
  • connection means between the diaphragms can be provided as a hollow push rod for sealed reciprocating movement through said sealed aperture in the unitary partition wall to transmit axial displacement forces between the two diaphragms
  • the means for supplying operating fluid comprises a shaft extending axially in a sealing manner through the hollow push rod and through the end covers, and including passage means extending along the shaft for conveying operating fluid to and from at least one of the outer compartments, said push rod co-operating with the shaft to control communication between said passage means and said one or both of the outer compartments.
  • Preferably means are included which operated in conjunction with the shaft to clamp the end covers to the central element.
  • the central element is made from a pair of dished plates rigidly secured together.
  • the central element is made from a single piece of material.
  • the unidirectional valves are preferably carried by readily detachable inlet and outlet manifolds connected respectively to the lower and upper parts of the central element and the valves can be ball valves.
  • Means for heating or cooling the fluid to be pumped can be included and which comprise a heating or cooling jacket formed in the enlarged outer periphery of the central element.
  • the double-diaphragm pump comprises a pair of axially spaced apart pumping chambers 1 and 2.
  • Each chamber has a pumping diaphragm indicated by reference numerals 3 and 4 which divide each pumping chamber 1 and 2 into an inner compartment, indicated by reference numerals 5 and 6, and an outer compartment 7 and 8 respectively.
  • the outer end of each pumping chamber is closed by an end cover 9 or 10 and the inner ends of both pumping chambers 1 and 2 are closed by a central element 11.
  • Connection means 12 extend between the diaphragms 3 and 4 and through the central element 11.
  • the central element 11 has a unitary partition wall 20 which extends between and closes the inner ends of the inner compartments 5 and 6 and this partition wall is substantially solid over a major portion of its area apart from a sealed aperture 21 to allow the connection means 12 to pass through it.
  • the partition wall is enlarged at its outer periphery 22 to carry the inlet and outlet ports 14 and 15 which are located respectively at the lower and upper portions of the element 11.
  • the rims of the end covers 9 and 10 peripherally engage respectively the outer rims 23 of the outer periphery 22 of the central element 11.
  • This central element 11 comprises two dish-like members 24, 25 which have a generally concave form with planar central portions 26, 27 which are held together by welding or other means to form the rigid unitary partition wall 20.
  • the central portions of the diaphragms 3 and 4 include embedded plates 28 and are connected to opposite ends of the connection means 12 which are in the form of a hollow push rod.
  • This push rod is slidably mounted in the sealed aperture 21 which is centrally located in the rigid central zone of the unitary partition wall 20 formed by the planar portions 26 and 27.
  • the end covers 9 and 10 are urged together and against the rims 23 of the members 24 and 25 by means of an axial shaft 30 which is held at one end by clamping means 31 and at the opposite end by a nut 32.
  • the clamping means carries a silencer 33.
  • the upper portion of the central element 10 formed by the members 24 and 25 is shaped to accommodate an exhaust manifold 34 in which is located a pair of balls 35 which provide the pair of outlet valves 17.
  • the balls 35 are seated in circular valve seatings 36 which lead to the ports 15 (not shown in Figure 2) which are located as high as possible in the inner compartments 5 and 6.
  • the lower part of the members 24 and 25 is also shaped to accommodate an inlet manifold 37 which again contains a pair of balls 38 which provide the inlet valves 16 and which are located on valve seatings 39 which lead to the inlet ports 14 (not shown in Figure 2).
  • the lower manifold 37 has an inlet pipe 40 and the upper manifold has an outlet pipe 41, as shown in Figure 2.
  • the push-rod diaphragm assembly is reciprocated by air, gas or liquid under pressure supplied to the two outer compartments 7 and 8 alternatively to form a change-over spool or other means in known manner.
  • a system is described in detail in EP-B-0 181 756 and the central passages for conveying the operating fluid are indicated by reference numeral 44.
  • the reciprocating movement of the push-rod diaphragm assembly alternately increases and decreases the volume of the inner compartments 5 and 6. This leads to fluid being drawn into the compartment whose volume is being increased through one of the lower ports 14 from the manifold 37. Similarly fluid is expelled from the compartment whose volume is being reduced through one of the upper ports 15 into the manifold 34.
  • Such operation is conventional for double diaphragm pumps.
  • the inlet and outlet manifolds 37 and 34 Due to the design of the pump allows for the inlet and outlet manifolds 37 and 34 to be located at the outer periphery of the central element 11 so that a relatively thin unitary partition wall 20 can be used thus allowing a considerable reduction in the overall axial dimensions of the pump when compared with known constructions in which the manifolds are located within a central element. Moreover, because the inner compartments 5 and 6 are adjacent the central element 11 and the inlet and outlet valves 16, 17 are carried at the top of the inner compartments 5 and 6, the length of the manifolds is reduced to a minimum and minimum wastage of valuable fluids is achieved when draining down. The construction also provides for the easy removal of the inlet and exhaust valve manifolds due to their location adjacent the outer rim of the central element.
  • the same reference numerals are used to indicate similar parts to those in Figures 1 and 2.
  • the construction of the ball valves has been simplified and the central element 11 is formed as a single body 50 by casting or machining from solid stock.
  • the machine body 50 includes four lower inlet port openings 51 and two upper outlet port openings 52.
  • the ports 51 enter directly into inner chambers 53 and the inlet manifold 54 is provided with circular ports 55 so that the balls 56 can bed directly into them and form the necessary seal.
  • the ports 55 in the manifold set the lower limit of travel for the balls.
  • the use of four manifolds in the lower portion of the machine body 50 ensures maximum filling for the pump chambers.
  • the upper outlet port openings 52 are also circular which also form seats 57 for the outlet balls 58.
  • a manifold 59 encloses the exhaust valves formed by the balls 58 and sets the upper limit of travel.
  • the inlet pipe 60 to the manifold 54 is horizontal and the outlet pipe 61 from manifold 59 is vertical. The choice of connection direction depends upon the construction of the relevant manifold and is independent of the main construction of the body of the pump.
  • valve construction shown in Figures 3 and 4 could be incorporated in the construction shown in Figures 1 and 2 and similarly the valve arrangements shown in Figures 1 and 2 could be used in the construction shown in Figures 4 and 5 where the element 10 is made from a single body of material.
  • the ball valves can be replaced by flap valves of any convenient and known type.
  • FIG. 5 shows such a construction which can be used whether the element 11 is formed from two dish-like members 24, 25 or from a solid body of material as shown in Figures 3 and 4.
  • Figure 5 shows a construction similar to that shown in Figures 3 and 4 but in which spaces 70 are provided in the enlarged outer periphery 22 of the unitary partition wall 20 which are closed by circumferential strips 71.
  • the spaces 70 are interconnected by a channel 73 so that a heat transfer medium, such as water, can be pumped through the spaces by suitable connections (not shown).
  • a heat transfer medium such as water
  • the spaces 70 can act as a heating or cooling jacket and the construction produced is more compact and less expensive than constructing a heating/cooling jacket to cover the complete pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP00311302A 1999-12-30 2000-12-18 Doppelmembranpumpe Withdrawn EP1113174A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9930809 1999-12-30
GBGB9930809.0A GB9930809D0 (en) 1999-12-30 1999-12-30 Double-diaphragm pumps

Publications (2)

Publication Number Publication Date
EP1113174A2 true EP1113174A2 (de) 2001-07-04
EP1113174A3 EP1113174A3 (de) 2002-01-02

Family

ID=10867158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00311302A Withdrawn EP1113174A3 (de) 1999-12-30 2000-12-18 Doppelmembranpumpe

Country Status (2)

Country Link
EP (1) EP1113174A3 (de)
GB (2) GB9930809D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010125328A1 (en) * 2009-04-29 2010-11-04 Flotronic Pumps Limited Double-diaphragm pumps
CN108506532A (zh) * 2018-06-08 2018-09-07 珠海市思卡净化技术有限公司 一种双球密封的出气阀

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105626487B (zh) * 2015-12-24 2018-04-20 广东基泰智能设备有限公司 无脉动柱塞泵
CN107013442A (zh) * 2016-03-02 2017-08-04 上海方顿工业设备有限公司 一种外置气控阀的气动隔膜泵

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132913A1 (de) 1983-04-07 1985-02-13 Flotronics Ag Membran- oder Kolbenpumpe
EP0181756A1 (de) 1984-11-06 1986-05-21 Flotronics Ag Doppelmembranpumpen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8713668D0 (en) * 1987-06-11 1987-07-15 Flotronics Ag Double-diaphragm pumps
US5332372A (en) * 1992-04-20 1994-07-26 Warren Rupp, Inc. Modular double-diaphragm pump
WO1996034202A1 (en) * 1995-04-27 1996-10-31 Svante Bahrton Double-acting pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132913A1 (de) 1983-04-07 1985-02-13 Flotronics Ag Membran- oder Kolbenpumpe
EP0181756A1 (de) 1984-11-06 1986-05-21 Flotronics Ag Doppelmembranpumpen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010125328A1 (en) * 2009-04-29 2010-11-04 Flotronic Pumps Limited Double-diaphragm pumps
GB2470348A (en) * 2009-04-29 2010-11-24 Flotronic Pumps Ltd Double diaphragm pump with unidirectional valve arrangement
GB2470348B (en) * 2009-04-29 2011-06-08 Flotronic Pumps Ltd Double-diaphragm pump with unidirectional valve arrangement
US8469681B2 (en) 2009-04-29 2013-06-25 Flotronic Pumps Limited Double-diaphragm pumps
CN108506532A (zh) * 2018-06-08 2018-09-07 珠海市思卡净化技术有限公司 一种双球密封的出气阀

Also Published As

Publication number Publication date
EP1113174A3 (de) 2002-01-02
GB0030886D0 (en) 2001-01-31
GB2357811A (en) 2001-07-04
GB9930809D0 (en) 2000-02-16

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