EP0435196B1 - Dispositif de conversion de pression - Google Patents

Dispositif de conversion de pression Download PDF

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Publication number
EP0435196B1
EP0435196B1 EP19900125101 EP90125101A EP0435196B1 EP 0435196 B1 EP0435196 B1 EP 0435196B1 EP 19900125101 EP19900125101 EP 19900125101 EP 90125101 A EP90125101 A EP 90125101A EP 0435196 B1 EP0435196 B1 EP 0435196B1
Authority
EP
European Patent Office
Prior art keywords
pressure
chamber
cylinder
piston
valve
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
EP19900125101
Other languages
German (de)
English (en)
Other versions
EP0435196A1 (fr
Inventor
Kunito Saeki
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.)
SEIHO KIKO CO Ltd
Original Assignee
SEIHO KIKO CO 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 SEIHO KIKO CO Ltd filed Critical SEIHO KIKO CO Ltd
Publication of EP0435196A1 publication Critical patent/EP0435196A1/fr
Application granted granted Critical
Publication of EP0435196B1 publication Critical patent/EP0435196B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B3/00—Intensifiers or fluid-pressure converters, e.g. pressure exchangers; Conveying pressure from one fluid system to another, without contact between the fluids

Definitions

  • the present invention relates to a pressure converting device or a booster according to the preamble of claim 1, for increasing the pressure of working fluid supplied thereto to discharge the same at a higher pressure.
  • a pressure converting device or a booster according to the preamble of claim 1, for increasing the pressure of working fluid supplied thereto to discharge the same at a higher pressure.
  • Such a device is known for instance from SU-A-1 488 596.
  • a conventional pressure converting device for increasing the pressure of working fluid supplied thereto to discharge the same at a higher pressure is disclosed in, for example, Japanese Patent Publication (Kokoku) No. 62-21994.
  • This known pressure converting device substantially comprises a low-pressure-side cylinder, a high-pressure-side cylinder disposed in line with and joined to the low-pressure-side cylinder, a low-pressure-side piston reciprocably fitted in the low-pressure-side cylinder, a high-pressure-side piston reciprocably fitted in the high-pressure cylinder, a pilot-operated directional control valve provided on a rear cover to supply the working fluid alternately to the front and rear chambers of the low-pressure-side cylinder, a pilot valve for operating the directional control valve and a limiter provided within a space formed in a piston rod to operate the pilot valve.
  • the low-pressure-side piston and the high-pressure-side piston are mounted on the piston rod.
  • the relatively large pressure converting device is subject to restrictions on the manner of installation and requires a large space for its installation.
  • this pressure converting device in some cases, is unable to be started when the pressure of the working fluid acts on both plungers.
  • Another prior art pressure converting device is known from SU-A-1 488 596.
  • two secondary cylinders are coaxially disposed on both sides of a primary cylinder and have a smaller inside diameter than the primary cylinder.
  • a low pressure side piston having a front and a rear piston rod extending to opposite sides is axially slidably positioned in the primary cylinder and thereby partitions the primary cylinder into a front and a rear chamber.
  • Each of the extending piston rods reaches into one of the secondary cylinders constituting the high pressure side and is axially movable therein upon axial movement of the low pressure piston.
  • a cylinder's reversing control valve is operated by two auxiliary valves serving as pilot valves and alternatively connects an inlet port to which a pressurized working fluid is supplied to the front and rear chambers.
  • the pilot valves on the other hand are positioned on opposite sides of the primary cylinder and are operated through shifting rods provided coaxially within the valves and which reach into the front and rear chambers of the primary cylinder, respectively.
  • the present invention provides a pressure converting device which comprises a primary clinder, a secondary cylinder disposed in line with said primary cylinder and having an inside diameter smaller than that of said primary cylinder, a low-pressure-side piston having a front piston rod and a rear piston rod, said low-pressure-side piston being axially reciprocably disposed in said primary cylinder so as to partition the interior of said primary cylinder into a front chamber (A) and a rear chamber (B), a high-pressure-side piston mounted on the front end of said front piston rod and being axially reciprocably disposed in said secondary cylinder together with said low-pressure-side piston, a directional control valve provided on a rear wall of the primary cylinder to connect an inlet port (P) alternately to said front chamber (A) and said rear chamber (B) of said primary cylinder so that a pressurized working fluid is supplied alternately to said front chamber (A) and said rear chamber (B), a pilot valve provided in said rear wall of said primary cylinder for operating said directional control valve,
  • the pressure converting device of another embodiment of this invention is also characterized in that a spring is provided on one side of the slide spool of the directional control valve to bias the slide spool in one direction, and a plunger is provided on the other side of the slide spool so as to press the slide spool in the opposite direction when the pressurized working fluid is supplied.
  • a secondary cylinder ( a high-pressure-side cylinder) 2 Is coaxially connected to a primary cylinder ( a low-pressure-side cylinder) 1 by way of a partition wall 3.
  • the inside diameter of the secondary cylinder 2 is designed to be smaller than that of a primary cylinder 1.
  • the rear end of the primary cylinder 1 is closed by a rear wall 4.
  • a pilot valve 5 is provided within the rear wall 4 on the rear extension of the primary cylinder 1, and a pilot-operated directional control valve 6 which Is controlled by the pilot valve 5 is mounted on the upper surface of the rear wall 4.
  • a low-pressure-side piston 7 is fitted in the primary cylinder 1 for reciprocation so as to define a front chamber A and a rear chamber B in the primary cylinder 1.
  • a piston rod 8 is formed integrally with the low-pressure-side piston 7 so as to extend frontwardly.
  • a high-pressure-side piston 9 is fitted in the secondary cylinder 2 for reciprocation and is mounted on the front piston rod 8.
  • the interior of the secondary cylinder 2 is partitioned into a front chamber C and a rear chamber D by the high-pressure-side piston 9.
  • a rear piston rod 10 is formed integrally with the low-pressure-side piston 7 so as to extend rearward from the low-pressure-side piston 7.
  • a shifting rod 11 is screwed in the rear end of the rear piston rod 10 coaxially with the same.
  • a flange 12 is formed on the rear end of the shifting rod 11.
  • a mechanical spool 13 is mounted on the shifting rod 11 so as to be axially movable with an inner flange 13-1 thereof in contact with the rear end surface 10-1 of the rear piston rod 10 or the flange 12 of the shifting rod 12.
  • a spool case 14 receiving the mechanical spool 13 therein has valve chambers a, b, c and d.
  • the shifting rod 11, the mechanical spool 13 and the spool case 14 are the components of the pilot valve 5.
  • the mechanical spool 13 is provided with an annular groove 15 in its outer circumference.
  • the rear end of the pilot valve 5 is closed with a rear plug 16.
  • the high-pressure-side piston 9 is provided with a high pressure-side passage 17 along its axis.
  • a check valve 20 consisting of a ball 18 and a sprig 19 is provided at the rear end of the high-pressure-side passage 17.
  • a ball stopper 21 for stopping the ball 18 of the check valve 20
  • a connecting passage 22 connecting the rear chamber D of the secondary cylinder 2 to the high-pressure-side passage 17, a high-pressure-side discharge passage 23 connecting the rear chamber D to a high-pressure-side discharge port 24 to discharge the high-pressure working fluid from the rear chamber D through the high-pressure-side discharge port 24, a check valve 25 provided within the upper wall of the secondary cylinder 2, and a passage 26 extended under the check valve 25 to supply the working fluid to the front chamber C of the secondary cylinder 2.
  • the check valve 25 has a ball 27, a spring 28, a valve seat 29 and a cap 30.
  • a supply passage 31 is formed through the circumferential wall of the secondary cylinder 2, the partition wall 3 and the circumferential wall of the primary cylinder 1 and in the rear wall 4 to connect the check valve 25 to a discharge passage 32 formed in the rear wall 4.
  • a front supply passage 33 is formed through the partition wall 3 and the circumferential wall of the primary cylinder 1 to connect the front chamber A of the primary cylinder 1 to the directional control valve 6.
  • a rear supply passage 34 is formed through the rear wall 4 to connect the rear chamber B of the primary cylinder 1 to the directional control valve 6.
  • the directional control valve 6 has a slide spool 35 integrally provided with lands 36 and 37.
  • the slide spool 35 is fitted in a spool case 38 having valve chambers e, f, g, h and i arranged in that order from left to right.
  • a spring 39 is placed in the right-hand end of the spool case 38 to bias the slide spool 35 continuously to the left.
  • Indicated at 40 is a spring seat, and at 41 is a plug.
  • a plunger 42 is provided on the left side of the slide spool 35.
  • the working fluid acts on the plunger 42 to push the slide spool 35 to the right.
  • Indicated at 43 is a plunger support cylinder, at 44 is a plunger operating chamber, at 45 is a plunger case, and at 46 is a plug.
  • the valve chamber e of the directional control valve 6 is connected to the discharge passage 32 by a passage E.
  • the valve chamber e opens into a discharge port T.
  • the valve chamber f is connected to the rear supply passage 34 by a passage F.
  • the valve chamber g is connected to the valve chamber c of the pilot valve 5 by a passage G and also to an inlet port P for receiving the working fluid.
  • valve chamber h is connected to the front supply passage 33 by a passage H.
  • the valve chamber i is connected to the supply passage 31 by a passage J.
  • the valve chamber a of the pilot valve 5 is connected through a passage 49 and the passage E to the discharge port T.
  • the mechanical spool 13 is provided with a through hole 50.
  • Packings 51,52,53 and 54 are fitted respectively in an annular groove formed in the circumference of the low-pressure-side piston 7, an annular groove formed in the inner circumference of the partition wall 3, an annular groove formed in the circumference of the rear end of the partition wall 3, and an annular groove formed in the outer circumference of the high-pressure-side piston 9.
  • a tubular valve seat 55 is fitted in the bore of the high-pressure-side piston 9.
  • valve chambers b and c of the pilot valve 5 are disconnected from each other to take a position shown in Fig. 6.
  • the high-pressure-side piston 9 is shifted frontward in the secondary cylinder 2 to exert a pressure on the working fluid filling the front chamber C by the axial force W 1 and, consequently, the pressure of the working fluid is increased.
  • the high-pressure working fluid flows through the high-pressure-side passage 17, the check valve 20, the rear chamber D and the high-pressure-side discharge passage 23 and is discharged from the high-pressure-side discharge port 24.
  • the shifting rod 11 connected to the rear piston rod 10 is shifted gradually frontward, shifting the mechanical spool 13 frontward with the flange 12 of the control rod 11 engaging the rear end 13-2 of the inner flange 13-1.
  • the working fluid pushes the plunger 42 to the right against the resilience of the spring 39 to shift the slide spool 35 to the right, so that the directional control valve 6 is set in a slate as shown in Fig. 2. Then, the working fluid flows through the front supply passage 33 into the front chamber A Of the primary cylinder 1, so that the low-pressure-side piston 7 is shifted rearward.
  • the high-pressure-side piston 9 is shifted rearward in the secondary cylinder 2 by the force W2 to exert pressure by the high-pressure-side piston 9 on the working fluid in the rear chamber D.
  • the high-pressure working fluid flows through the high-pressure-side discharge passage 23 and is discharged through the high-pressure-side discharge port 24.
  • the pressure converting device of this invention has following advantages.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Reciprocating Pumps (AREA)

Claims (4)

  1. Dispositif de conversion de pression qui comprend :
    a) un cylindre principal (1),
    b) un cylindre secondaire (2) placé dans l'alignement dudit cylindre principal (1) et ayant un diamètre intérieur plus petit que celui dudit cylindre principal (1),
    c) un piston (7) de côté basse-pression ayant une tige de piston antérieure (8) et une tige de piston postérieure (10), ledit piston (7) de côté basse-pression étant placé de façon à pouvoir aller et venir axialement à l'intérieur dudit cylindre principal (1) de manière à partager l'intérieur dudit cylindre principal (1) en une chambre antérieure (A) et une chambre postérieure (B),
    d) un piston (9) de côté haute-pression, monté sur l'extrémité avant de ladite tige de piston antérieure (8) et placé de façon à pouvoir aller et venir axialement à l'intérieur dudit cylindre secondaire (2) en même temps que ledit piston (7) de côté basse-pression,
    e) une vanne directionnelle de commande (6) placée sur une paroi arrière (4) du cylindre principal (1) pour coupler un orifice d'entrée (P) alternativement à ladite chambre antérieure (A) et à ladite chambre postérieure (B) dudit cylindre principal (1) de manière à ce qu'un fluide de travail sous pression soit envoyé alternativement à ladite chambre antérieure (A) et à ladite chambre postérieure (B),
    f) une vanne pilote (5) placée dans ladite paroi arrière (4) dudit cylindre principal (1) pour actionner ladite vanne directionnelle de commande (6), ladite vanne pilote (5) logeant de façon concentrique une tige de commutation (11), ladite tige de commutation (11) étant capable d'actionner ladite vanne pilote (5),
    caractérisé en ce que :
    g) ledit piston (9) de côté haute-pression partage l'intérieur dudit cylindre secondaire (2) en une chambre antérieure (C) et une chambre postérieure (D), ladite chambre postérieure (D) communiquant avec un orifice de décharge (24) haute-pression,
    h) un clapet anti-retour (25) est placé dans le passage d'amenée (31) pour envoyer une partie du fluide de travail sortant de ladite vanne directionnelle de commande (6) à ladite chambre antérieure (C) dudit cylindre secondaire (2),
    i) un clapet anti-retour (20) est placé dans le passage (17) de côté haute pression qui relie ladite chambres antérieure (C) et postérieure (D)dudit cylindre secondaire (2), et
    j) ladite tige de commutation (11) couplée à l'extrémité arrière de ladite tige de piston postérieure (10) est capable d'actionner ladite vanne pilote (5) en correspondance au déplacement alternatif de ladite tige de piston postérieure (10) qui s'étend en arrière du piston (7) de côté basse-pression.
  2. Dispositif de conversion de pression selon la revendication 1, dans lequel ladite tige de commutation (11) fait partie intégrante de ladite tige de piston postérieure (10).
  3. Dispositif de conversion de pression selon la revendication 1, dans lequel ladite vanne directionnelle de commande (6) comporte un tiroir coulissant (35), un ressort (29) placé sur un côté dudit tiroir coulissant (35) pour pousser ledit tiroir coulissant (35) dans un sens, et un plongeur (42) placé sur l'autre côté dudit tiroir coulissant (35) pour pousser ledit tiroir (35) dans le sens opposé lors de l'envoi du fluide de travail sous pression.
  4. Dispositif de conversion de pression selon la revendication 1, dans lequel ladite vanne directionnelle de commande (6) est montée séparément sur ladite paroi arrière (4) dudit cylindre principal (1).
EP19900125101 1989-12-26 1990-12-21 Dispositif de conversion de pression Expired - Lifetime EP0435196B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP151331/89U 1989-12-26
JP1989151331U JP2512551Y2 (ja) 1989-12-26 1989-12-26 圧力変換装置

Publications (2)

Publication Number Publication Date
EP0435196A1 EP0435196A1 (fr) 1991-07-03
EP0435196B1 true EP0435196B1 (fr) 1994-11-09

Family

ID=15516254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900125101 Expired - Lifetime EP0435196B1 (fr) 1989-12-26 1990-12-21 Dispositif de conversion de pression

Country Status (3)

Country Link
EP (1) EP0435196B1 (fr)
JP (1) JP2512551Y2 (fr)
DE (1) DE69014089T2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5484269A (en) * 1995-04-24 1996-01-16 Moog Inc. Fluid intensifier
WO2000047894A1 (fr) * 1999-02-15 2000-08-17 Kazutomi Yokota Dispositif d'aspiration et d'evacuation de liquide trace

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904858C (de) * 1951-12-04 1954-02-22 Wilhelm Reppel Hin und her gehender Druckuebersetzer fuer pneumatische Anlagen
GB1281627A (en) * 1969-10-18 1972-07-12 Aisin Seiki Hydraulic intensifier
FR2134650B1 (fr) * 1971-04-30 1974-07-26 Bendix Corp
JPS4868803U (fr) * 1971-12-01 1973-09-01
JPS5612977A (en) * 1979-07-12 1981-02-07 Nissan Motor Paint dryer
DE3323902C1 (de) * 1983-07-02 1984-08-30 Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal Druckübersetzer
JPS6332172A (ja) * 1986-07-24 1988-02-10 Nippon Pneumatic Kogyo Kk 高圧水発生装置

Also Published As

Publication number Publication date
DE69014089D1 (de) 1994-12-15
JPH0387976U (fr) 1991-09-09
JP2512551Y2 (ja) 1996-10-02
EP0435196A1 (fr) 1991-07-03
DE69014089T2 (de) 1995-05-18

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