EP3663577A1 - Piston pump drive and control pneumatic oscillating system used in medical research - Google Patents

Piston pump drive and control pneumatic oscillating system used in medical research Download PDF

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Publication number
EP3663577A1
EP3663577A1 EP19020605.2A EP19020605A EP3663577A1 EP 3663577 A1 EP3663577 A1 EP 3663577A1 EP 19020605 A EP19020605 A EP 19020605A EP 3663577 A1 EP3663577 A1 EP 3663577A1
Authority
EP
European Patent Office
Prior art keywords
pneumatic
oscillating system
control
piston
distribution
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.)
Pending
Application number
EP19020605.2A
Other languages
German (de)
French (fr)
Inventor
Petrin Drumea
Liliana Dumitrescu
Gabriela Matache
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.)
Institutul National De Cercetare Dezvoltare Pentru Optoelectronics Filiala Institutul De Cercetari Pentru Hidraulica Si Pneumatica
Original Assignee
Institutul National De Cercetare Dezvoltare Pentru Optoelectronics Filiala Institutul De Cercetari Pentru Hidraulica Si Pneumatica
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 Institutul National De Cercetare Dezvoltare Pentru Optoelectronics Filiala Institutul De Cercetari Pentru Hidraulica Si Pneumatica filed Critical Institutul National De Cercetare Dezvoltare Pentru Optoelectronics Filiala Institutul De Cercetari Pentru Hidraulica Si Pneumatica
Publication of EP3663577A1 publication Critical patent/EP3663577A1/en
Pending 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
    • F04B9/123—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 having only one pumping chamber
    • F04B9/125—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 having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting elastic-fluid motor
    • F04B9/1253—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 having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting elastic-fluid motor one side of the double-acting piston fluid motor being always under the influence of the fluid under pressure
    • 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
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1077—Flow resistance valves, e.g. without moving parts
    • 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
    • F04B9/123—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 having only one pumping chamber
    • 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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous

Definitions

  • the drive and control oscillating pneumatic system is used to actuate a piston pump used in medical applications such as heart pulsations to ensure a working fluid flow by moving the piston on a stroke correlated with the control frequency of the pneumatic oscillating system that may vary.
  • the invention can also be used in the food industry, chemical industry, etc., in which applications of the kind already mentioned can be identified.
  • the technical problem that the invention solves is the conveyance, in wide ranges of frequency and amplitude, of a working fluid used mainly in medical applications, but also in food industry applications, chemical industry applications and similar, with fixed or variable flow rate, in a sterile environment or one which should not be contaminated with other substances, by eliminating conventional hydraulic drives.
  • the drive and control pneumatic system according to the invention is made of a piston pump that can carry special fluids, actuated by a pneumatic oscillating circuit, which allows one to easily adjust, in wide ranges, both the amplitude of the piston working stroke and the frequency of oscillations, without electrical - electronic control intervention.
  • the following advantages are obtained by using the piston pump drive and control pneumatic oscillating system:
  • Fig. 1 depicts the functional block diagram of the drive and control pneumatic oscillating system.
  • the system consists of an air preparation unit FR 3, a pneumatic directional control valve 2, a discharge throttle 1, a distribution and oscillation slide valve 4 and a piston with valves distribution for pumping the working fluid 5 .
  • the pneumatic cylinder as it is supplied only to the orifice "t", starts to move to the left and breaks the connection between "a" and "b".
  • the control circuit of the pneumatic directional control valve begins to slowly lose pressure through the throttle 1 and when the spring overcomes the pneumatic control, the directional control valve shifts to the initial distribution chamber, supplying pressure to the orifice "p", and discharges to the atmosphere through the throttle 1.
  • the speed of unloading the control pressure through the throttle 1 controls the amplitude of the leftward cylinder stroke, and the flow rate received from the source 3 controls the frequency of the movement of the pneumatic cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The piston pump drive and control pneumatic oscillating system consisting of an air preparation unit 3, a pneumatic directional control valve 2, a discharge throttle 1 with variable orifice and a distribution and oscillation slide valve 4 which pneumatically actuates the piston and the valves distribution 5 of a pump, enabling the flow of working fluid to be supplied by moving the working piston along a stroke (c) correlated with the pneumatic control frequency obtained by varying of the supply flow of the distribution and oscillation slide valve or by varying the flow section of the discharge throttle.

Description

    Technical Field
  • The drive and control oscillating pneumatic system is used to actuate a piston pump used in medical applications such as heart pulsations to ensure a working fluid flow by moving the piston on a stroke correlated with the control frequency of the pneumatic oscillating system that may vary.
  • The invention can also be used in the food industry, chemical industry, etc., in which applications of the kind already mentioned can be identified.
    • Background Art
  • There are known classic systems for drive and control of hydraulic pumps, consisting of flow and pressure distribution and control devices that use hydraulic oil as a working fluid, and in case of a breakdown the oil can seriously contaminate the working environment, which is not allowed in certain areas.
  • In the patent document DE3228109 "Linearantrieb zum Erzeugen impulsartiger schneller Stossbewegungen" a pneumatic oscillating system for actuating a pump piston is also presented. The limitations of this system consist in the limited possibilities of adjusting the amplitude and frequency of the piston movement.
    • Summary of invention
  • The technical problem that the invention solves is the conveyance, in wide ranges of frequency and amplitude, of a working fluid used mainly in medical applications, but also in food industry applications, chemical industry applications and similar, with fixed or variable flow rate, in a sterile environment or one which should not be contaminated with other substances, by eliminating conventional hydraulic drives.
  • The drive and control pneumatic system according to the invention is made of a piston pump that can carry special fluids, actuated by a pneumatic oscillating circuit, which allows one to easily adjust, in wide ranges, both the amplitude of the piston working stroke and the frequency of oscillations, without electrical - electronic control intervention. The following advantages are obtained by using the piston pump drive and control pneumatic oscillating system:
    • Working environment is not contaminated with hydraulic oil;
    • Cost price of the facility decreases by eliminating conventional hydraulic drives;
    • Energy losses and residual heat generated in hydraulic drives are eliminated;- Maintenance costs are eliminated;
    • Noise decreases.
    Brief description of drawings
  • The following is an example of embodiment of the invention related to Fig. 1 which depicts the functional block diagram of the drive and control pneumatic oscillating system.
    • Description of embodiments
  • According to it, the system consists of an air preparation unit FR 3, a pneumatic directional control valve 2, a discharge throttle 1, a distribution and oscillation slide valve 4 and a piston with valves distribution for pumping the working fluid 5.
  • Operation of the system is as follows:
    From the air preparation unit 3 the cylinder chambers connected through the orifices "t" and "a" are permanently supplied; by means of the directional control valve 2, when the spring force overcomes the pneumatic control force, the chamber connected through the orifice "p" is also supplied.
  • In this state the pneumatic cylinder moves to the right, until, near the end of the stroke, the connection between the orifice "a" and the orifice "b" is set, and thus the control of the directional control valve 2 is supplied.
  • When the force generated by the pressure in the control circuit overcomes the force of the directional control valve spring, the directional control valve shifts to the other distribution chamber which discharges the pressure in the orifice "p" to the atmosphere.
  • At this moment, the pneumatic cylinder, as it is supplied only to the orifice "t", starts to move to the left and breaks the connection between "a" and "b". The control circuit of the pneumatic directional control valve begins to slowly lose pressure through the throttle 1 and when the spring overcomes the pneumatic control, the directional control valve shifts to the initial distribution chamber, supplying pressure to the orifice "p", and discharges to the atmosphere through the throttle 1.
  • At this point, the movement to the right of the pneumatic cylinder is resumed until nearly reaching the end of the stroke, at which moment the connection between the orifices "a" and "b" is restored, and the cycle starts again from the beginning.
  • The speed of unloading the control pressure through the throttle 1 controls the amplitude of the leftward cylinder stroke, and the flow rate received from the source 3 controls the frequency of the movement of the pneumatic cylinder.
  • All these oscillations are taken over by the pump piston Dp to ensure the transfer of the working fluid through the valves S1 and S2.
  • The system according to the invention works optimally under the conditions of the functional characteristics of the piston pump framing in the value ranges of p = 4÷10 bar; f = 0.5÷10 Hz, Dp = 20,63 mm, and the pneumatic oscillating system framing in the value ranges of 0.5-3 bar, air flow 90-1500 I / min and a distance of 25-60 mm between the orifices "a" and "b".

Claims (4)

  1. Piston pump drive and control pneumatic oscillating system characterized in that it consists of an air preparation unit (3), a pneumatic directional control valve (2) with a maximum frequency of 10 Hz, a discharge throttle (1) with variable orifice, a distribution and oscillation slide valve (4), which pneumatically actuates the piston and the valves distribution (5) of a pump that conveys working fluid.
  2. Pneumatic oscillating system according to claim 1, characterized in that it is supplied from a max. 10 bar pneumatic network and it operates automatically without the intervention of a control panel or an electrical - electronic control unit
  3. Pneumatic oscillating system according to claim 1, characterized in that the simple performing of the working stroke is done with no control equipment only by choosing two preset orifices that determine the displacement limits.
  4. Pneumatic oscillating system according to claim 1, characterized in that the control of working stroke amplitude (c) is achieved by varying the flow section of the throttle (1), and by varying the supply flow provided by the regulator in the air preparation unit (FR) (3) oscillation frequency is adjusted.
EP19020605.2A 2018-12-03 2019-10-29 Piston pump drive and control pneumatic oscillating system used in medical research Pending EP3663577A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ROA201801028A RO134247A2 (en) 2018-12-03 2018-12-03 Pneumatic oscillating system for drive and regulation of a piston pump used in medical research

Publications (1)

Publication Number Publication Date
EP3663577A1 true EP3663577A1 (en) 2020-06-10

Family

ID=68617977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19020605.2A Pending EP3663577A1 (en) 2018-12-03 2019-10-29 Piston pump drive and control pneumatic oscillating system used in medical research

Country Status (2)

Country Link
EP (1) EP3663577A1 (en)
RO (1) RO134247A2 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528482A1 (en) * 1965-05-06 1969-08-21 Maschf Augsburg Nuernberg Ag Control and conveying device operated with compressed air
US3721091A (en) * 1971-04-23 1973-03-20 Tokyu Car Corp Impact hydraulic forming device
FR2333944A1 (en) * 1975-12-01 1977-07-01 Ecole Nale Sup Arts Metiers Solar energy powered engine - has reciprocating piston with grooves in stem acting as valve element in sleeve
DE3228109A1 (en) 1982-07-28 1984-02-02 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Linear drive for producing impulse-like rapid percussive motions
US4780065A (en) * 1987-09-25 1988-10-25 William Sayers Cylinder pump having an air sensor activated reversing valve
US5862828A (en) * 1996-07-10 1999-01-26 Hygrama Ag Oscillating valve for a double acting operating cylinder
US9816535B2 (en) * 2012-05-08 2017-11-14 Tox Pressotechnik Gmbh & Co. Kg Hydropneumatic device for pressure transmission and riveting device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528482A1 (en) * 1965-05-06 1969-08-21 Maschf Augsburg Nuernberg Ag Control and conveying device operated with compressed air
US3721091A (en) * 1971-04-23 1973-03-20 Tokyu Car Corp Impact hydraulic forming device
FR2333944A1 (en) * 1975-12-01 1977-07-01 Ecole Nale Sup Arts Metiers Solar energy powered engine - has reciprocating piston with grooves in stem acting as valve element in sleeve
DE3228109A1 (en) 1982-07-28 1984-02-02 Festo-Maschinenfabrik Gottlieb Stoll, 7300 Esslingen Linear drive for producing impulse-like rapid percussive motions
US4780065A (en) * 1987-09-25 1988-10-25 William Sayers Cylinder pump having an air sensor activated reversing valve
US5862828A (en) * 1996-07-10 1999-01-26 Hygrama Ag Oscillating valve for a double acting operating cylinder
US9816535B2 (en) * 2012-05-08 2017-11-14 Tox Pressotechnik Gmbh & Co. Kg Hydropneumatic device for pressure transmission and riveting device

Also Published As

Publication number Publication date
RO134247A2 (en) 2020-06-30

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