EP0421940A1 - Pompe à commande pneumatique - Google Patents

Pompe à commande pneumatique Download PDF

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Publication number
EP0421940A1
EP0421940A1 EP90810760A EP90810760A EP0421940A1 EP 0421940 A1 EP0421940 A1 EP 0421940A1 EP 90810760 A EP90810760 A EP 90810760A EP 90810760 A EP90810760 A EP 90810760A EP 0421940 A1 EP0421940 A1 EP 0421940A1
Authority
EP
European Patent Office
Prior art keywords
pump
piston
liquid
circuit
tubular body
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.)
Ceased
Application number
EP90810760A
Other languages
German (de)
English (en)
French (fr)
Inventor
Frédéric Dietrich
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.)
VACUMJET AG
Original Assignee
Ecot SA
Vacumjet AG
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 Ecot SA, Vacumjet AG filed Critical Ecot SA
Publication of EP0421940A1 publication Critical patent/EP0421940A1/fr
Ceased 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/1207—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air using a source of partial vacuum or sub-atmospheric pressure
    • F04B9/1222—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air using a source of partial vacuum or sub-atmospheric pressure the return stroke being obtained by an elastic fluid under pressure

Definitions

  • pumps for pumping, transferring or moving a wide variety of liquids; generally these pumps consist of a pumping element proper, associated with an electric motor in the form of a monobloc element or in separate components.
  • a pumping element proper associated with an electric motor in the form of a monobloc element or in separate components.
  • a pneumatic control of the pump in question is therefore particularly suitable for such use; different manufacturers have proposed pneumatically actuated pumps, in particular: the utility model DE-U-8.620.319 describes a pneumatically controlled pump, the piston of which comprises three annular seals separating the working fluid from the transported fluid; in addition, the control of the intake and exhaust valves is independent of the position of the piston in the cylinder.
  • -US-A-1,816,025 describes a system comprising two pump bodies, each provided with a float, and operating alternately. Each float acts on the air intake and exhaust valves via a linkage.
  • -the patent FR-A-824,474 relates to a pump in which the position of a float controls the intake and exhaust air valves via of a set of levers.
  • the patent GB-A-1,345,627 relates to a motor supply pump, controlled by the engine gases, but the piston of which is provided with seals against the chamber.
  • the invention proposes to produce a pump which, supplied by a pneumatic control circuit, can therefore be connected directly to the pneumatic circuits of the factory, or else to its own pneumatic circuits, therefore not requiring its own motor. training.
  • the pump according to the invention comprises only one moving part, the piston, which also ensures the opening and closing of the intake and discharge circuits of the control air as well as liquid to be transferred. It is easy to choose the constituent material (s) according to the degree of corrosivity of the liquid to be circulated and, the energy source being decentralized, it is not necessary to take special precautions in the case where the pumps are placed in an explosive atmosphere.
  • the pump according to the invention has the characteristics mentioned in the claims.
  • the pump consists, as can be seen in FIG. 1, of an elongated tubular body 1, of preferably circular section but which may be of another shape, and in which a piston 2 circulates freely along the axis longitudinal of said tubular body.
  • the longitudinal axis of the tubular body 1 is vertical.
  • the tubular body is closed at its two ends by bottoms 10a and 10b fixed to the tubular body by any means suitable for the constituent materials both of tubular body 1 and bottoms 10a and 10b; the figure shows an example of a fixing system, usable in the case of a tubular body of synthetic material, where the bottom 10a, respectively 10b, is supported on a seal 11a, 11b and is tightened by bolts not shown here, between two rings 12a and 13a, respectively 12b and 13b, against a support 14a, 14b fixed to the tubular body 1.
  • the bottoms 10a and 10b can be fixed to it by welding or by any other means ensuring sealing.
  • the bottom 10a is pierced in its center with an orifice 15a opening out inside a nozzle 16a connected to the pneumatic circuit. This tip 16a is fixed to the bottom 10a by any suitable means, for example by welding.
  • a tip 16b is fixed to the bottom 10b, pierced with an orifice 15b, this tip 16b being connected to the circuit of the circulating liquid.
  • the diameters of the orifices 15a and 15b are arbitrary, but adapted to the diameter of the pipes, both of the pneumatic circuit and of the circuit of the circulating liquid to which they are connected; generally, the diameter of the orifice 15b will be larger than that of the orifice 15a.
  • the piston 2 is dimensioned so as to slide very freely inside the tubular body; in the case where it is circular, the diameter of the piston will therefore be slightly less than the inside diameter of said tubular body, so as to leave a certain clearance between the piston and the wall of the tubular body.
  • the height of the piston must be sufficient so that the latter is properly guided inside the tubular body.
  • the piston 2 is shown in Figure 1 as consisting of a cylinder in the outer side wall from which a number of grooves have been dug, as well as a recess on the bottom. These grooves and hollows play no role in the operation of the pump and simply save material.
  • the piston 2 comprises two circular grooves 20a and 20b, one on its upper face and the other on its lower face, in which are housed circular seals 21a, respectively 21b, O-ring seals for example.
  • the piston 2 defines an upper chamber 17a and a lower chamber 17b, the upper chamber extending in the direction of the bottom 10a, while the chamber 17b extends in the direction of the bottom 10b.
  • the upper chamber 17a is connected to the pneumatic control circuit
  • the orifice 15b and the endpiece 16b the lower chamber 17b is connected to the circulating liquid circuit.
  • the displacement of the piston 2 inside the tubular body 1 will therefore be controlled by the difference in pressures between the chambers 17a and 17b; in other words, when the piston has been brought against the bottom 10b by an overpressure in the chamber 17a coming from the pneumatic circuit, it completely and tightly obstructs the orifice 15b by its circular seal 21b, thus preventing the penetration of liquid inside the tubular body 1.
  • the piston 2 By reducing the air pressure in the chamber 17a, by means which we will see later, so as to make this pressure lower than that prevailing in the circuit of circulating liquid and consequently to that prevailing in the chamber 17b, the piston 2 will tend to detach from the bottom 10b and move towards the bottom 10a.
  • the material constituting the piston 2 Since the material constituting the piston 2 has a specific mass lower than that of the liquid to be circulated, said piston will float above the liquid and reach the bottom 10a before the liquid, so as to seal the orifice 15a , via the circular seal 21a, before the liquid reaches it. In this case, the chamber 17b occupies its maximum volume, this volume being filled with liquid. It will then suffice to restore sufficient pressure in the pneumatic circuit, in order to push the piston 2 towards the bottom 10b, to discharge the liquid into its circulation circuit and return to the previous initial situation.
  • the operation of the pump can be understood even better by examining FIG. 2, in which schematically the pump is represented in an application for transferring a liquid from a reservoir 30 to another reservoir 31.
  • the pneumatic control circuit 4 mainly comprises a compressor 40 and a vacuum pump 41 connected to the upper chamber 17a via a three-way valve 42, controlled by a suitable control device 42a, this device being able to be of mechanical, electrical, electronic, pneumatic or hydraulic type.
  • This control device 42a acting on the three-way valve 42 is responsible for sequentially connecting either the compressor 40, in order to impose an overpressure in the chamber 17a, said overpressure pushing the piston 2 downwards and discharging the liquid into the liquid circulation circuit 3, ie the vacuum pump 41, imposing a pressure reduction in the chamber 17a and sucking the piston 2 as well as the liquid in the chamber 17b.
  • the control device regulates the rate of rise of the piston 2 in the tubular body 1 so that the liquid remains in contact with the underside of the piston 2 and that there is no cavitation phenomenon in the chamber 17b .
  • a retention device provided with a purge 43 interposed between the pump and the three-way valve 42 makes it possible to retain any droplets or vapors of liquid, so that they are not sucked by the vacuum pump 41. So that transfer or circulation of the liquid takes place in the desired direction, two non-return valves 32 and 33 are provided on the liquid circulation circuit 3; the non-return valve 33 also makes it possible to avoid an air intake in the circuit 3.
  • Figure 3 shows a pump similar to that of Figure 1, but whose piston 2 is spherical, can be full or empty, like a ping pong ball for example, the only constraints being as before that the diameter of the sphere is slightly less than that of the tubular body 1 and that the specific mass of the sphere is less than that of the liquid.
  • the sealing devices between the orifices 15a and 15b and the piston 2 are transferred to the orifices in question, FIG. 3 representing two possible embodiments, either an O-ring 18 is placed directly on the orifice 15a, or the orifice 15b has a shape such that the spherical piston 2 comes to bear there exactly in order to close it.
  • the figure shows two possible embodiments of the sealing devices carried over the orifices, it is understood that other embodiments are possible, and that the two orifices can be equipped with the same type of device or devices different.
  • the pump has been presented here in a liquid transfer application; it is understood that it applies to many other uses, in general this type of pump can be used as suction pump, pressure pump, suction and pressure pump and circulation pump, the implementation according to one or the other of these categories being made by a judicious choice of the overpressure and the pneumatic depression controlling the movement of the piston.
  • the figure shows the pump equipped with a compressor and a vacuum pump; in the case of an application comprising a plurality of pumps, these two elements can be common to all of the pumps or even in some cases consist of the air pressure and vacuum circuits of the plant. It can even be envisaged, in the event that a vacuum is not necessary for the operation of the pump, that the vacuum pump is eliminated, the corresponding path of the three-way valve then opening onto an orifice at atmospheric pressure.
  • the constituent materials of the pump elements will be chosen according to the envisaged application, and will be able to resist in particular to the corrosive and / or temperature attack of the liquid to be transported;
  • the tubular body will preferably be made of synthetic material or, if it is necessary to have a metallic body, stainless steel may be used for example, the piston preferably being chosen from synthetic material;
  • the bottoms, end caps, seals and fixing systems will be chosen in order to resist the action of the liquid too and to be able to assemble with each other and with the tubular body.
  • the construction of a pump according to the invention is extremely simple, requiring no rotating member or very high machining precision; the only moving part being the piston, whose contact with the tubular body is very loose and is constantly “lubricated” by the liquid, the maintenance of the pump will be facilitated since it will not undergo any wear.
  • the viscosity of the liquid to be transported does not play a role in the functioning of the pump, since the speed of displacement of the piston can be regulated by the speed of establishment of the vacuum and the overpressure in the upper chamber; in the case of very viscous liquids, a device for pumping and transferring products of all viscosities, described in patent CH 647145, can come as complete the installation and help transport the said liquid.
  • the pump according to the invention of a very low unit cost, requiring no particular maintenance, adapts to all kinds of applications, in particular those requiring a large number of pumps, a real saving being due to the fact that the power source is common to all the pumps. Since this power source is decentralized and no risk of sparks can appear near the pumps, they can work in an explosive atmosphere without additional precautions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP90810760A 1989-10-06 1990-10-04 Pompe à commande pneumatique Ceased EP0421940A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH366189 1989-10-06
CH3661/89 1989-10-06

Publications (1)

Publication Number Publication Date
EP0421940A1 true EP0421940A1 (fr) 1991-04-10

Family

ID=4260799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90810760A Ceased EP0421940A1 (fr) 1989-10-06 1990-10-04 Pompe à commande pneumatique

Country Status (3)

Country Link
US (1) US5092743A (ja)
EP (1) EP0421940A1 (ja)
JP (1) JPH03149359A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101799000A (zh) * 2010-03-15 2010-08-11 浙江大学 利用螺杆换向的气动泵
ITMC20090056A1 (it) * 2009-03-20 2010-09-21 Marco Cecconi Dispositivo per la riconversione degli impianti di erogazione di bevande fredde alla spina.

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5267838A (en) * 1992-01-03 1993-12-07 Baugh Benton F Severe service compressor system
US5451144A (en) * 1993-08-18 1995-09-19 French; George F. Air-operated pump
US5807083A (en) * 1996-03-27 1998-09-15 Tomoiu; Constantin High pressure gas compressor
US5779098A (en) * 1996-08-22 1998-07-14 Grand Soft Equipment Company Pressure control system for free-floating piston
US5897295A (en) * 1997-12-11 1999-04-27 Rogers; Tommy R. Timer controlled pneumatic water pump
US7007456B2 (en) * 2002-05-07 2006-03-07 Harrington Steven M Dual chamber pump and method
US7611333B1 (en) * 2002-05-07 2009-11-03 Harrington Steven M Multiple chamber pump and method
KR100601902B1 (ko) * 2004-01-14 2006-07-20 주식회사 씨엔텍코리아월드 가스조절/차단밸브 및 이를 이용한 온수 자동순환장치
EP1643244B2 (en) † 2004-09-07 2015-09-09 Asahi Kasei Bioprocess, Inc. Hoist-free chromatography method
GB0420196D0 (en) * 2004-09-11 2004-10-13 Steele David Improved piston and cylinder arrangement
US20060185671A1 (en) * 2005-02-17 2006-08-24 Durr Systems, Inc. Powder conveying pump
DE102006007277A1 (de) * 2006-02-02 2007-08-09 Fydec Holding Sa Vorrichtung und Verfahren zum Fördern von Stoffen
DE102009046649A1 (de) * 2009-11-12 2011-05-19 Robert Bosch Gmbh Klimakompressor für ein Fahrzeug, Fahrzeug
JP2012144985A (ja) * 2011-01-06 2012-08-02 Ono Sokki Co Ltd 液体加圧容器
CN102852752B (zh) * 2012-03-23 2015-01-21 宁波大学 一种气动泵
NL1040531C2 (nl) * 2013-12-06 2015-06-09 Alcmair Partners B V Inrichting voor het beademen van patiã«nten.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1816025A (en) * 1929-01-19 1931-07-28 Sablik Ignaz Liquid feeding apparatus
FR824474A (fr) * 1936-09-02 1938-02-09 Perfectionnements aux pompes
GB937023A (en) * 1962-04-19 1963-09-18 Aerojet General Co Fluid projection apparatus
FR1380748A (fr) * 1963-10-25 1964-12-04 Pompe à fluides utilisant un fluide moteur
GB1345627A (en) * 1971-12-22 1974-01-30 Mcintyre T Prime movers
FR2238879A1 (ja) * 1973-07-26 1975-02-21 Coulter Electronics
DE8620319U1 (ja) * 1986-07-29 1988-02-11 Schneider, Friedhelm, 5226 Reichshof, De

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3556682A (en) * 1968-08-12 1971-01-19 Hitachi Ltd Apparatus for liquid displacement transfer
GB2076477A (en) * 1979-11-19 1981-12-02 Tornqvist Peter Johan Torsten Apparatus generating a reciprocating motion
US4548550A (en) * 1983-05-11 1985-10-22 Nippon Zeon Co., Ltd. Method and system for driving blood pumping devices
JPS6061416A (ja) * 1983-09-14 1985-04-09 Hitachi Ltd スラリ−連続圧送装置
US4653989A (en) * 1985-11-18 1987-03-31 Poly Oil Pump, Inc. Oil well pumping mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1816025A (en) * 1929-01-19 1931-07-28 Sablik Ignaz Liquid feeding apparatus
FR824474A (fr) * 1936-09-02 1938-02-09 Perfectionnements aux pompes
GB937023A (en) * 1962-04-19 1963-09-18 Aerojet General Co Fluid projection apparatus
FR1380748A (fr) * 1963-10-25 1964-12-04 Pompe à fluides utilisant un fluide moteur
GB1345627A (en) * 1971-12-22 1974-01-30 Mcintyre T Prime movers
FR2238879A1 (ja) * 1973-07-26 1975-02-21 Coulter Electronics
DE8620319U1 (ja) * 1986-07-29 1988-02-11 Schneider, Friedhelm, 5226 Reichshof, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMC20090056A1 (it) * 2009-03-20 2010-09-21 Marco Cecconi Dispositivo per la riconversione degli impianti di erogazione di bevande fredde alla spina.
CN101799000A (zh) * 2010-03-15 2010-08-11 浙江大学 利用螺杆换向的气动泵

Also Published As

Publication number Publication date
US5092743A (en) 1992-03-03
JPH03149359A (ja) 1991-06-25

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