EP0109417B1 - Hydropneumatic pressure converter - Google Patents

Hydropneumatic pressure converter Download PDF

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Publication number
EP0109417B1
EP0109417B1 EP19830901610 EP83901610A EP0109417B1 EP 0109417 B1 EP0109417 B1 EP 0109417B1 EP 19830901610 EP19830901610 EP 19830901610 EP 83901610 A EP83901610 A EP 83901610A EP 0109417 B1 EP0109417 B1 EP 0109417B1
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EP
European Patent Office
Prior art keywords
cylinder
housing
hydraulic cylinder
front plate
hydraulic
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
Application number
EP19830901610
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German (de)
French (fr)
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EP0109417A4 (en
EP0109417A1 (en
Inventor
Béla ZIMBER
Imre Molnar
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT83901610T priority Critical patent/ATE23913T1/en
Publication of EP0109417A1 publication Critical patent/EP0109417A1/en
Publication of EP0109417A4 publication Critical patent/EP0109417A4/en
Application granted granted Critical
Publication of EP0109417B1 publication Critical patent/EP0109417B1/en
Expired 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
    • F15B11/072—Combined pneumatic-hydraulic systems
    • 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
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/216—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being pneumatic-to-hydraulic converters

Definitions

  • the invention relates to a pneumo-hydraulic pressure transducer with a pneumatic primary side and a hydroutomatic secondary side.
  • a device consisting of a pneumatic working cylinder and a hydraulic working cylinder is generally used, in which the piston of the pneumatic working cylinder forming the primary side is rigidly connected to the piston of the hydraulic working cylinder forming the secondary side.
  • the pressure is converted in relation to the cylinder diameter.
  • there is a disadvantage in that it is caused by the cylinders arranged axially one behind the other. Space requirement is too large.
  • the economy of the device is also impaired by the fact that two working cylinders are required, a sophisticated seal between the two cylinders and the pistons being ensured.
  • the large space requirement and the high cost of the known device limit its applicability in numerous cases.
  • Pneumo-hydraulic pressure transducers with the features from the introductory part of claim 1 are already known (FR-A-24 53 299; GB-A-1 376 417).
  • the primary side By designing the primary side as an immersion cylinder in the form of a rolling membrane with a cup-shaped membrane plate attached to it, the sealing problem between a cylinder and a piston is eliminated for the primary side.
  • a rolling diaphragm With a rolling diaphragm, however, the size of the pneumatic pressure is limited.
  • these known constructions in which the housing of the primary side and the secondary side of the pressure transducer are also arranged axially one behind the other, still have a relatively large overall length.
  • the object of the invention is to create a pneumo-hydraulic pressure transducer which, with a simple construction, requires little space.
  • a pneumo-hydraulic pressure transducer with the features according to the preamble of claim 1 in that the hose membrane is designed as a bellows, by which the cylindrical recess of its end plate is surrounded, and in that the cylinder housing of the hydraulic cylinder within the housing the primary side is arranged such that in the axially extended position of the bellows (3) the cylinder housing of the hydraulic cylinder (4) is located within the recess of the end plate.
  • the pressure transducer according to the invention is extremely space-saving because the primary side and the secondary side are arranged one inside the other such that the displacement of the hydraulic cylinder is arranged within the displacement of the end plate of the bellows.
  • the spring from which the end plate of the bellows is returned to its initial position, preferably surrounds the cylinder housing of the hydraulic cylinder and the spring is also supported on the end plate of the bellows in the recess.
  • the pressure transducer according to the invention is extremely simple and is constructed from relatively inexpensive structural components.
  • the pneumo-hydraulic pressure converter is arranged in the housing 11.
  • the primary side is formed by a bellows 3, the end face of which is closed by an end plate 2, in which a cylindrical recess is formed.
  • the interior 1 of the bellows 3 can be connected to a pneumatic pressure source via a connector 13 formed on the housing 11.
  • the secondary side of the pneumo-hydraulic pressure transducer is formed by a hydraulic cylinder 4, which is arranged so that it lies in the axially extended position of the bellows 3 within the same or within the recess of the end plate 2.
  • the piston 5 of the hydraulic cylinder 4 is attached to the bottom of the recess on the end plate 2 of the bellows 3.
  • the hydraulic cylinder 4 itself has an inflow space 7 connected to an inflow rescue 6 and a displacement space 8.
  • the displacement chamber 8 is connected to a drain line 14.
  • a partition 9 is provided between the inflow space 7 and the displacement space 8, in which a seal 10 is arranged. The seal cooperates with the piston 5 so that the inflow space 7 and the displacement space 8 are separated from each other.
  • the hydraulic cylinder is also provided with a seal 15 above the inflow space 7.
  • a compression spring 12 holds the bellows 3 in its basic position.
  • the pressure transducer according to the invention can be used as a working device; In this case, so-called suction pressure valves or check valves must be inserted into the inflow line 6 or inserted into the outflow line. If the pressure transducer is used as a pump, it is expedient to operate a plurality of pressure transducers in parallel but out of phase in order to reduce the flow pulsation or to achieve a uniform flow.

Abstract

A hydropneumatic pressure converter has a first pneumatic part and a second hydraulic part. The essence of the invention lies in that the first pneumatic portion is formed by a flexible cylinder provided with a front plate having a cylindrical cavity. The cylinder of the second hydraulic part is arranged in the cylindrical cavity of the front plate of the flexible cylinder. The piston of the hydraulic cylinder is attached to the front wall which has the cylindrical cavity. The hydraulic cylinder has a fluid inlet chamber connected to an inlet conduit, and a displacement chamber which is separable therefrom with the hydraulic cylinder. The solution according to the invention is of particularly reduced size since the first part is arranged in the second part. Furthermore, the piston stroke requires only a small volume.

Description

Die Erfindung betrifft einen pneumo-hydraulischen Druckwandler mit einer pneumatischen Primärseite und einer hydrautischen Sekundärseite.The invention relates to a pneumo-hydraulic pressure transducer with a pneumatic primary side and a hydroutomatic secondary side.

Auf zahlreichen Gebieten der Technik ist es erforderlich, pneumatischen Druck in hydraulischen Druck zu transformieren. Zu diesem Zwecke wird im allgemeinen eine aus einem pneumatischen Arbeitszylinder und einem hydraulischen Arbeitszylinder bestehende Vorrichtung verwendet, bei welcher der Kolben des die Primärseite bildenden pneumatischen Arbeitszylinders mit dem Kolben des die Sekundärseite bildenden hydraulischen Arbeitszylinders steif verbunden ist. Der Druck wird im Verhältnis der Zylinderdurchmesser umgewandelt. In vielen Fällen besteht jedoch ein Nachteil darin, daß der von den axial hintereinander angeordneten Zylindern bedingte. Platzbedarf zu groß ist. Die Wirtschaftlichkeit der Vorrichtung wird auch dadurch beeinträchtigt, daß je zwei Arbeitszylinder erforderlich sind, wobei eine anspruchsvolle Dichtung zwischen beiden Zylindern und den Kolben sicherzustetlen ist. Der große Raumbedarf, sowie der hohe Kostenaufwand bei der bekannten Vorrichtung beschränken in zahlreichen Fällen deren Anwendbarkeit.In many areas of technology it is necessary to transform pneumatic pressure into hydraulic pressure. For this purpose, a device consisting of a pneumatic working cylinder and a hydraulic working cylinder is generally used, in which the piston of the pneumatic working cylinder forming the primary side is rigidly connected to the piston of the hydraulic working cylinder forming the secondary side. The pressure is converted in relation to the cylinder diameter. In many cases, however, there is a disadvantage in that it is caused by the cylinders arranged axially one behind the other. Space requirement is too large. The economy of the device is also impaired by the fact that two working cylinders are required, a sophisticated seal between the two cylinders and the pistons being ensured. The large space requirement and the high cost of the known device limit its applicability in numerous cases.

Es sind auch bereits pneumo-hydraulische Druckwandler mit den Merkmalen aus dem einleitenden Teil des Anspruchs 1 bekannt (FR-A-24 53 299; GB- A-1 376 417). Durch die Ausbildung der Primärseite als Schtauchzylinder in Form einer Rollmembran mit daran befestigtem becherförmigen Membranteller entfällt für die Primärseite das Dichtungsproblem zwischen einem Zylinder und einem Kolben. Bei einer Rollmembran ist jedoch die Größe des pneumatischen Druckes beschränkt. Außerdem haben auch diese bekannten Konstruktionen, bei denen die Gehäuse der Primärseite und der Sekundärseite des Druckwandlers ebenfalls axial hintereinander angeordnet sind, noch eine verhältnismäßig große Baulänge.Pneumo-hydraulic pressure transducers with the features from the introductory part of claim 1 are already known (FR-A-24 53 299; GB-A-1 376 417). By designing the primary side as an immersion cylinder in the form of a rolling membrane with a cup-shaped membrane plate attached to it, the sealing problem between a cylinder and a piston is eliminated for the primary side. With a rolling diaphragm, however, the size of the pneumatic pressure is limited. In addition, these known constructions, in which the housing of the primary side and the secondary side of the pressure transducer are also arranged axially one behind the other, still have a relatively large overall length.

Durch die Erfindung wird die Aufgabe gelöst, einen pneumo-hydraulischen Druckwandler zu schaffen, der bei einfacher Konstruktion einen geringen Platzbedarf hat.The object of the invention is to create a pneumo-hydraulic pressure transducer which, with a simple construction, requires little space.

Dies wird gemäß der Erfindung bei einem pneumo-hydraulischen Druckwandler mit den Merkmalen entsprechend dem Oberbegriff des Anspruchs 1 dadurch erreicht, daß die Schlauchmembran als Balgen ausgebildet ist, von welchem die zylindrische Vertiefung seiner Stirnplatte umgeben ist, und daß das Zylindergehäuse des Hydraulikzylinders innerhalb des Gehäuses der Primärseite derart angeordnet ist, daß sich in der axial ausgedehnten Stellung des Balgens (3) das Zylindergehäuse des Hydraulikzylinders (4) innerhalb der Vertiefung der Stirnplatte befindet.This is achieved according to the invention in a pneumo-hydraulic pressure transducer with the features according to the preamble of claim 1 in that the hose membrane is designed as a bellows, by which the cylindrical recess of its end plate is surrounded, and in that the cylinder housing of the hydraulic cylinder within the housing the primary side is arranged such that in the axially extended position of the bellows (3) the cylinder housing of the hydraulic cylinder (4) is located within the recess of the end plate.

Der erfindungsgemäße Druckwandler ist äußerst raumsparend, weil die Primärseite und die Sekundärseite so ineinander angeordnet sind, daß der Hubraum des Hydraulikzylinders innerhalb des Hubraumes der Stirnplatte des Balgens angeordnet ist.The pressure transducer according to the invention is extremely space-saving because the primary side and the secondary side are arranged one inside the other such that the displacement of the hydraulic cylinder is arranged within the displacement of the end plate of the bellows.

Vorzugsweise umgibt die Feder, von welcher die Stirnplatte des Balgens in ihre Ausgangsstellung zurückgestellt wird, das Zylindergehäuse des Hydraulikzylinders und ist die Feder ebenfalls in der Vertiefung der Stirnplatte des Balgens an dieser abgestützt.The spring, from which the end plate of the bellows is returned to its initial position, preferably surrounds the cylinder housing of the hydraulic cylinder and the spring is also supported on the end plate of the bellows in the recess.

Der erfindungsgemäße Druckwandler ist äußerst einfach und ist aus verhältnismäßig billigen strukturellen Bestandteilen aufgebaut.The pressure transducer according to the invention is extremely simple and is constructed from relatively inexpensive structural components.

Die Erfindung wird anhand eines Ausführungsbeispieles mit Hilfe der beiliegenden Zeichnung - die den erfindungsgemäßen Druckwandler im Schnitt darstellt - näher erläutert.The invention is explained in more detail using an exemplary embodiment with the aid of the accompanying drawing, which shows the pressure transducer according to the invention in section.

Der pneumo-hydraulische Druckwandler ist im Gehäuse 11 angeordnet. Die Primärseite wird von einem Balgen 3 gebildet, dessen Stirnseite von einer Stirnplatte 2 abgeschlossen ist, in welcher eine zylindrische Vertiefung ausgebildet ist. Der Innenraum 1 des Balgens 3 ist über einen auf dem Gehäuse 11 ausgebildetem Stutzen 13 mit einer pneumatischen Druckquelle verbindbar. Die Sekundärseite des pneumo-hydraulischen Druckwandlers wird von einem Hydraulikzylinder 4 gebildet, der so angeordnet ist, daß er in der axial ausgedehnten Stellung des Balgens 3 innerhalb desselben bzw. innerhalb der Vertiefung der Stirnplatte 2 liegt. Der Kolben 5 des Hydraulikzylinders 4 ist an dem Boden der Vertiefung an der Stirnplatte 2 des Balgens 3 befestigt. Der Hydraulikzylinder 4 selbst weist einen mit einer Zuflußlettung 6 verbundenen Zuflußraum 7 und einen Verdrängerraum 8 auf. Der Verdrängerraum 8 ist mit einer Abflußleitung 14 verbunden. Zwischen dem Zuflußraum 7 und dem Verdrängerraum 8 ist eine Trennwand 9 vorgesehen, in der eine Dichtung 10 angeordnet ist. Die Dichtung wirkt mit dem Kolben 5 so zusammen, daß der Zuflußraum 7 und der Verdrängerraum 8 voneinander abgetrennt werden. Selbstverständlich ist der Hydraulikzylinder auch über dem Zuflußraum 7 mit einer Dichtung 15 versehen. Eine Druckfeder 12 hält den Balgen 3 in seiner Grundstellung.The pneumo-hydraulic pressure converter is arranged in the housing 11. The primary side is formed by a bellows 3, the end face of which is closed by an end plate 2, in which a cylindrical recess is formed. The interior 1 of the bellows 3 can be connected to a pneumatic pressure source via a connector 13 formed on the housing 11. The secondary side of the pneumo-hydraulic pressure transducer is formed by a hydraulic cylinder 4, which is arranged so that it lies in the axially extended position of the bellows 3 within the same or within the recess of the end plate 2. The piston 5 of the hydraulic cylinder 4 is attached to the bottom of the recess on the end plate 2 of the bellows 3. The hydraulic cylinder 4 itself has an inflow space 7 connected to an inflow rescue 6 and a displacement space 8. The displacement chamber 8 is connected to a drain line 14. A partition 9 is provided between the inflow space 7 and the displacement space 8, in which a seal 10 is arranged. The seal cooperates with the piston 5 so that the inflow space 7 and the displacement space 8 are separated from each other. Of course, the hydraulic cylinder is also provided with a seal 15 above the inflow space 7. A compression spring 12 holds the bellows 3 in its basic position.

Der pneumo-hydraulische Druckwandler arbeitet wie folgt:

  • Über den Stutzen 13 wird Druckluft in das Innere 1 des Balgens 3 eingeführt, worauf dieser sich ausdehnt bzw. mit seiner Stirnplatte 2 nach unten fährt und den Kolben 5 des sekundärseitigen Hydraulikzylinders vor sich herschiebt. Sobald der Kolben 5 den Zuflußraum 7 verläßt und die Dichtung 10 erreicht, schließt er den Weg zwischen dem Zuflußraum 7 und dem Verdrängerraum 8 ab; gleichzeitig preßt er während seines Fortschreitens das Öl unter einem hohen Druck aus dem Verdrängerraum 8 über die Abflußleitung 14 aus. Wenn dann der Balgen 3 entlüftet wird, kehrt die Stirnplatte des Balgens 3 auf Wirkung der Feder 12 in ihre Grundstellung zurück und zieht auch den Kolben 5 zurück. Jetzt ist der Weg zwischen dem Zuflußraum 7 und dem Verdrängerraum 8 wieder freigegeben.
The pneumo-hydraulic pressure converter works as follows:
  • Compressed air is introduced into the interior 1 of the bellows 3 via the connecting piece 13, whereupon the latter expands or moves with its end plate 2 downward and pushes the piston 5 of the secondary-side hydraulic cylinder in front of it. As soon as the piston 5 leaves the inflow space 7 and reaches the seal 10, it closes the path between the inflow space 7 and the displacement space 8; at the same time he presses the oil under high pressure from the displacer 8 through the drain line 14 as he progresses. When the bellows 3 is then vented, the end plate of the bellows 3 returns to its basic position due to the spring 12 and also pulls the piston 5 back. Now the path between the inflow space 7 and the displacement space 8 is cleared again.

Außerdem kann der erfindungsgemäße Druckwandler als Arbeitsvorrichtung verwendet werden; in diesem Fall müssen sogenannte Saug-Druckventile, bzw. Rückschlagventile in die Zuflußleitung 6 eingesetzt bzw. in die Abflußleitung eingefügt werden. Wenn der Druckwandler als Pumpe verwendet wird, ist es zweckmäßig, mehrere Druckwandler parallel, aber phasenverschoben zur Verringerung der Strömungspulsation bzw. zum Erreichen einer gleichmäßigen Strömung zu betreiben.In addition, the pressure transducer according to the invention can be used as a working device; In this case, so-called suction pressure valves or check valves must be inserted into the inflow line 6 or inserted into the outflow line. If the pressure transducer is used as a pump, it is expedient to operate a plurality of pressure transducers in parallel but out of phase in order to reduce the flow pulsation or to achieve a uniform flow.

Claims (2)

1. A hydropneumatic pressure converter the primary side of which has a hose diaphragm (3) which may be subjected to pneumatic pressure, which is arranged in a housing (11) and which has an output member in the form of a front plate (2) displaceable in the housing (11) under the effect of the pressure against a spring (12), the secondary side of the converter being a hydraulic cylinder (4) connected with the housing (11) of the primary side, the displacement piston (5) projecting into the cylinder housing is supported on the bottom of a cylindrical recess of the front plate (2), characterised in that the hose diaphragm is formed as a bellows (3) surrounding the cylindrical recess of the front plate (2), and that the cylindrical housing of the hydraulic cylinder (4) is disposed within the housing (11) of the primary side such that in the axially extended position of the bellows (3) the cylindrical housing of the hydraulic cylinder (4) is disposed within the recess of the front plate (2).
2. A hydropneumatic pressure converter according to claim 1, characterised in that the spring (12) surrounds the cylindrical housing of the hydraulic cylinder (4) and is supported in the recess of the front plate (2) of the bellows (3) at the bottom of the recess.
EP19830901610 1982-05-24 1983-05-24 Hydropneumatic pressure converter Expired EP0109417B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83901610T ATE23913T1 (en) 1982-05-24 1983-05-24 PNEUMOHYDRAULIC PRESSURE TRANSDUCER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU165282A HU188794B (en) 1982-05-24 1982-05-24 Pneumohydraulic pressure converter
HU165282 1982-05-24

Publications (3)

Publication Number Publication Date
EP0109417A1 EP0109417A1 (en) 1984-05-30
EP0109417A4 EP0109417A4 (en) 1984-08-10
EP0109417B1 true EP0109417B1 (en) 1986-11-26

Family

ID=10955521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901610 Expired EP0109417B1 (en) 1982-05-24 1983-05-24 Hydropneumatic pressure converter

Country Status (5)

Country Link
EP (1) EP0109417B1 (en)
JP (1) JPS59501019A (en)
DE (1) DE3367964D1 (en)
HU (1) HU188794B (en)
WO (1) WO1983004288A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4445011A1 (en) * 1994-12-16 1996-06-20 Tox Pressotechnik Gmbh Hydraulic pressure intensifier
DE19538861A1 (en) * 1995-10-19 1997-04-24 Bayerische Motoren Werke Ag Magnifying force especially for operating motor vehicle brakes

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US465145A (en) * 1891-12-15 Leather-splitting machine
FR1202448A (en) * 1958-07-17 1960-01-11 Renault Improvements to blowers
US3200717A (en) * 1963-04-11 1965-08-17 Einsiedler Charles Stephen Hydraulic pressure volume transformer
GB1163887A (en) * 1967-04-07 1969-09-10 Spencer Franklin Ltd Improvements in or relating to Pressure Intensifying Devices
FR2077960A1 (en) * 1970-02-27 1971-11-05 Courbet Gerard
US3776267A (en) * 1972-09-07 1973-12-04 Borg Warner Pressure transfer unit with bellows
GB1376417A (en) * 1973-04-06 1974-12-04 Bendix Corp Hydro-pneumatic brake control system
SU516842A1 (en) * 1974-08-01 1976-06-05 Центральное проектно-конструкторское бюро Министерства речного флота РСФСР Hydraulic motion multiplier
FR2453299A1 (en) * 1979-04-03 1980-10-31 Wabco Fahrzeugbremsen Gmbh Multiplication of pneumatic pressure for hydraulic circuit - uses pre-constrained helicoidal spring to support rigid plunger piston

Also Published As

Publication number Publication date
WO1983004288A1 (en) 1983-12-08
JPS59501019A (en) 1984-06-07
EP0109417A4 (en) 1984-08-10
DE3367964D1 (en) 1987-01-15
HU188794B (en) 1986-05-28
EP0109417A1 (en) 1984-05-30

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