EP0692072B1 - Pressure medium driven device performing linear motion - Google Patents

Pressure medium driven device performing linear motion Download PDF

Info

Publication number
EP0692072B1
EP0692072B1 EP94909953A EP94909953A EP0692072B1 EP 0692072 B1 EP0692072 B1 EP 0692072B1 EP 94909953 A EP94909953 A EP 94909953A EP 94909953 A EP94909953 A EP 94909953A EP 0692072 B1 EP0692072 B1 EP 0692072B1
Authority
EP
European Patent Office
Prior art keywords
piston
primary piston
pressure medium
pressure
pump
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.)
Expired - Lifetime
Application number
EP94909953A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0692072A1 (en
Inventor
Reijo Karppinen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0692072A1 publication Critical patent/EP0692072A1/en
Application granted granted Critical
Publication of EP0692072B1 publication Critical patent/EP0692072B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/007—Reciprocating-piston liquid engines with single cylinder, double-acting piston
    • F03C1/0073—Reciprocating-piston liquid engines with single cylinder, double-acting piston one side of the double-acting piston being always under the influence of the liquid under pressure
    • F03C1/0076—Reciprocating-piston liquid engines with single cylinder, double-acting piston one side of the double-acting piston being always under the influence of the liquid under pressure the liquid under pressure being continuously delivered to one cylinder chamber through a valve in the piston for actuating the return stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L21/00—Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting elements, e.g. in free-piston machines
    • F01L21/04—Valves arranged in or on piston or piston-rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • F01L25/066—Arrangements with main and auxiliary valves, at least one of them being fluid-driven piston or piston-rod being used as auxiliary valve
    • 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
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
    • F04B9/111—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
    • F04B9/113—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting liquid motor

Definitions

  • the invention relates to a device operated by pressure medium and producing linear to-and-fro motion.
  • the device is characterized by the construction of a primary piston with necessary valves generating the to-and-fro motion.
  • Previously known motion generating devices are a.o. hydraulic cylinders working by pressure medium and different types of percussion machines, in which the percussion piston gets its motive energy in different ways from pressure medium.
  • percussion machines self-acting valves are used for control of medium, whereat the percussion machines perform, automatically, continuous to-and-fro motion. See, for example, US-A-4031812.
  • hydraulic cylinders are controlled by means of outside valves.
  • a hydraulic accumulator e.g. a blast tank, is used to charge sufficient pressure and discharge it instantly against a piston that is to be moved, in order to produce at least a one-way rapid piston motion.
  • the valve actuators are in the body of the device and the piston is a component to transfer motion or power only.
  • US-A-4031812 discloses a pressure medium operated device of the kind with which the present invention is concerned.
  • a double-acting primary or working piston reciprocable in a body defining a cylinder houses a valve which controls the alternating application of the pressure medium to opposite sides of the primary piston and is itself operated by the pressure medium.
  • the control valve comprises a valve spool which is slidable in the primary piston and on the opposite ends of which the pressure medium acts to displace the valve spool.
  • US-A-3788781 discloses another pressure medium operated device in which a single-acting primary or working piston houses a control valve which cooperates with the body and serves to equalize the pressures on oppositie sides of the primary piston to allow a return spring to displace the primary piston through a return stroke.
  • US-A-4352664 discloses a similar fluid pressure operated device having a single-acting primary or working piston.
  • Present devices are not applicable as permanently working generators of to-and-fro motion only by hydraulic pressure, especially when the motion should be rapid in both directions, generation of pressure shocks in the valves avoided and one would not want to use a gas containing hydraulic accumulator in order to accelerate the motions.
  • a most important advantage of the invention is that by means of a built-in valve reversal free of pressure shock in the piston extreme ends is reached by prepressure control. This is of significance, since in the device a relatively voluminous stream flow is utilized in relation to its size. There will be no pressure shock in the stream line, because the piston is "freely” floating in the extreme end, i.e. it reverses along with the change of pressures active in different parts of the piston. This means that there is not an accurately determined reversal point, on reaching of which the valve would at once be mechanically closed or opened.
  • a further advantage of the device is its simple and solid construction and its applicability to numerous purposes.
  • the rapid to-and-fro motion produced by the device can be utilized for pumping fluids and gases, even against great counterpressure, the device motion can be transfered into vibration of a vibrator, stroke of a percussion machine a.s.o.
  • the piston motions can be accelerated in one direction, the motion in one direction becomes stronger as well.
  • Figre 1 shows an exemplary pump application of the invention.
  • the device is a hydraulically operated pump in a pressure washer with two cylinder spaces 20.
  • the water suction ducts are 22 and pressure channels 21.
  • Cylinders 1 in both ends of the device.
  • Secondary pistons 14 and 15 are separated from the drive fluid space 6 and 18 by packing pairs 16. Drainages 17 are between the packing pairs 16.
  • Cylinders 1 and the body center 2 are pieces of simple cylinders.
  • the pressure medium inlet channel is 4 and return channel 5. Inside the body center 2 there is a primary piston 3, the diameter of which actual piston part is the greatest ring shaped part. Secondary pistons 14 and 15 are fastened to primary piston 3 by thread.
  • Figure 1 shows all pistons in motion in the arrow direction to the right.
  • the fluid pressure is acting on the primary piston 3 ring surface A forcing the piston to the right.
  • the pressure in chamber space 18 exits over channels 12, 10 and 7 to return pipe 5.
  • Valve 8,9 stays on the left, while the pressure is acting on the shut-off part 9.
  • Piston 3 travels to its extreme position on the right. The extreme position, where the piston motion reverses, is determined by the travel of discharge channel 13 to the edge of ring chamber 19. Thereby, over discharge channel 13 full driving pressure is produced behind piston part 8 of valve 8,9 pressing the valve to the right and opening the channel closed by shut-off part 9.
  • the gap section of piston 8 is greater than the area of gap 23 that is closed by shut-off part 9.
  • FIG. 2 shows valve 8,9 still in the space where pistons 3,14,15 are moving to the left.
  • Valve part 9 is freely in the chamber.
  • Piston 8 is pushed by full pressure to the left by a force determined by the gap section of the shut-off gap and to the right by full pressure from the rear space of piston 8.
  • Piston 8 keeps its position on the right till, in a situation as per figure 2, the discharge channel 13 reaches again the edge of ring chamber 6, whereat the pressure behind piston 8 sinks remarkably.
  • Full pressure through the shut-off gap to piston 8 can now move the piston to the left shut-off position and, in its turn, the shut-off part 9 closes gap 23 and thus the situation as per figure 1 is reached.
  • the length of travel of the primary piston is determined by the length of shut-off part 26.
  • Discharge channel 13 is connected to channel 10 by a branch channel, which has a choking section 11.
  • a branch channel which has a choking section 11.
  • FIG. 3 shows a part enlargement and section of valve 8,9 construction.
  • the bevel surface 25 of valve 8 is tight against the corresponding seat surface of part 3.
  • the pressure acting over shut-off gap 23 upon part 8 is active in piston 8 front surface only on an area as big as shut-off gap 23.
  • the pressure acts rapidly also on bevel surface 25 and the force of valve 8,9 motion increases at once.
  • the cylindrical surface of part 9 is not tight against the inner surface of opening 23 and tightening is performed with part 9 top surface 24 against part 23 front surface. With this construction reliable function of the device is achieved.
  • this shut-off part acts in the same way as the valve applied to piston 8, i.e.
  • Pistons 14,15 or only either of them, can be replaced by a moving arm coming out from the housing and the motion of it utilized.
  • the aim is not to restrict the device to certain applications but many modifications are possible within the inventional concept determined in the enclosed patent claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
EP94909953A 1993-03-25 1994-03-24 Pressure medium driven device performing linear motion Expired - Lifetime EP0692072B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI931324A FI96132C (fi) 1993-03-25 1993-03-25 Paineväliaineella toimiva laite ja pumppu
FI931324 1993-03-25
PCT/FI1994/000108 WO1994021915A1 (en) 1993-03-25 1994-03-24 Pressure medium driven device performing linear motion

Publications (2)

Publication Number Publication Date
EP0692072A1 EP0692072A1 (en) 1996-01-17
EP0692072B1 true EP0692072B1 (en) 1999-09-15

Family

ID=8537625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94909953A Expired - Lifetime EP0692072B1 (en) 1993-03-25 1994-03-24 Pressure medium driven device performing linear motion

Country Status (5)

Country Link
EP (1) EP0692072B1 (fi)
JP (1) JP3538426B2 (fi)
DE (1) DE69420713T2 (fi)
FI (1) FI96132C (fi)
WO (1) WO1994021915A1 (fi)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3369928A1 (en) * 2017-03-03 2018-09-05 PistonPower ApS Hydraulic pressure intensifier
EP3369930A1 (en) * 2017-03-03 2018-09-05 PistonPower ApS Double acting hydraulic pressure intensifier
CN108590997A (zh) * 2017-03-03 2018-09-28 活塞动力有限责任公司 压力放大器
US10774847B2 (en) 2017-03-03 2020-09-15 Pistonpower Aps Pressure amplifier

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7740455B1 (en) 2007-07-09 2010-06-22 Brian Nissen Pumping system with hydraulic pump

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788781A (en) * 1972-03-17 1974-01-29 Owatonna Tool Co Hydraulic system
US4352644A (en) * 1980-05-12 1982-10-05 Owatonna Tool Company Air-hydraulic pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3369928A1 (en) * 2017-03-03 2018-09-05 PistonPower ApS Hydraulic pressure intensifier
EP3369930A1 (en) * 2017-03-03 2018-09-05 PistonPower ApS Double acting hydraulic pressure intensifier
CN108590997A (zh) * 2017-03-03 2018-09-28 活塞动力有限责任公司 压力放大器
CN108590997B (zh) * 2017-03-03 2020-04-28 活塞动力有限责任公司 压力放大器
US10774847B2 (en) 2017-03-03 2020-09-15 Pistonpower Aps Pressure amplifier
US10895269B2 (en) 2017-03-03 2021-01-19 Pistonpower Aps Double acting hydraulic pressure intensifier
US10920796B2 (en) 2017-03-03 2021-02-16 Pistonpower Aps Hydraulic pressure intensifier
US11060532B2 (en) 2017-03-03 2021-07-13 Pistonpower Aps Pressure amplifier

Also Published As

Publication number Publication date
FI931324A (fi) 1994-09-26
FI931324A0 (fi) 1993-03-25
JPH08508076A (ja) 1996-08-27
EP0692072A1 (en) 1996-01-17
FI96132B (fi) 1996-01-31
DE69420713T2 (de) 2000-05-31
FI96132C (fi) 1996-05-10
WO1994021915A1 (en) 1994-09-29
DE69420713D1 (de) 1999-10-21
JP3538426B2 (ja) 2004-06-14

Similar Documents

Publication Publication Date Title
EP0304210B1 (en) Double diaphragm pumps
US5558506A (en) Pneumatically shifted reciprocating pump
US6210131B1 (en) Fluid intensifier having a double acting power chamber with interconnected signal rods
US6769884B2 (en) Hydraulic drive system for piston pumps
CA1293197C (en) Free-piston motor with hydraulic or pneumatic energy transmission
US5803188A (en) Hydraulically driven percussion hammer
EP0466764B1 (en) An arrangement for controlling a linear motor
EP0692072B1 (en) Pressure medium driven device performing linear motion
US4483402A (en) Paving breaker
US4242941A (en) Actuator valve
US3256827A (en) Hydraulic power converter
US3796050A (en) High energy rate actuator
US1782975A (en) High-pressure reciprocating compressor
US5683230A (en) Pressure medium driven device performing linear motion
US4188174A (en) Wear resistant valve
US2735404A (en) L- komph
JPH1113707A (ja) 液圧式切換えユニット
JPH0361675A (ja) 補助圧形成装置
US4424012A (en) In-line fluid pump and shuttle valve therefor
US4846634A (en) Water to emulsion transformer
US5676033A (en) Pneumatic drive device
EP0537334A1 (en) Diaphragm and piston pump
NZ215091A (en) Gas or steam engine with reciprocating free piston
GB2302712A (en) Air-operated hydraulic motor
KR960000667B1 (ko) 복귀 스프링을 사용하지 않은 유압해머에 있는 유체의 주입구와 출구포트를 피스톤 마모와 무관하게 밀봉시키는 슬리브형 방향 제어밸브

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

17P Request for examination filed

Effective date: 19951023

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT SE

17Q First examination report despatched

Effective date: 19960819

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19990915

REF Corresponds to:

Ref document number: 69420713

Country of ref document: DE

Date of ref document: 19991021

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20030326

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030328

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040325

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041130

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090206

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20090930

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100324

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100324