EP0281052A1 - Réservoir pour systèmes hydrauliques avec grande sécurité d'infiltration d'air de l'extérieur - Google Patents

Réservoir pour systèmes hydrauliques avec grande sécurité d'infiltration d'air de l'extérieur Download PDF

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Publication number
EP0281052A1
EP0281052A1 EP88102984A EP88102984A EP0281052A1 EP 0281052 A1 EP0281052 A1 EP 0281052A1 EP 88102984 A EP88102984 A EP 88102984A EP 88102984 A EP88102984 A EP 88102984A EP 0281052 A1 EP0281052 A1 EP 0281052A1
Authority
EP
European Patent Office
Prior art keywords
tank
superimposition
area
air
outside
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.)
Withdrawn
Application number
EP88102984A
Other languages
German (de)
English (en)
Inventor
Giampaolo Nelzi
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.)
CAMPISA S.R.L.
Original Assignee
CAMPISA Srl
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 CAMPISA Srl filed Critical CAMPISA Srl
Publication of EP0281052A1 publication Critical patent/EP0281052A1/fr
Withdrawn legal-status Critical Current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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies

Definitions

  • the present invention relates to a tank for hydraulic systems with high safety against infiltration of air from outside.
  • hydraulic tanks which feed pumps, are rigid and, during the phase of aspiration, are subjected to a negative pressure which is particularly elevated in the case of pumps without a return since a considerable quantity of liquid is aspirated from the tank.
  • known tanks are generally made of rigid material, though particular care is placed in filtering the air absorbed from outside, in any case during the operation of the system there occurs the infiltration of a high percentage of humidity when rather high negative pressures occur inside the tank.
  • the aim of the present invention is to eliminate the above described disadvantages by providing a tank for hydraulic systems capable of giving excellent assurances against infiltrations of air during operation.
  • an object of the invention is to provide a tank having a structure which is simple to manufacture and has a modest cost.
  • Another object of the invention is to provide a tank which can outwardly vent air which accidentally infiltrates into other areas of the hydraulic system fed by the tank.
  • a tank for hydraulic systems with high safety against the infiltration of air from outside comprising a container which internally defines a cavity, adapted for the containment of working liquid and being connectable to a hydraulic circuit, characterized in that said cavity is insulated in an airtight manner at least from outside inwards and in that said container is elastically deformable at operating pressures.
  • the tank according to the invention comprises a container which defines in its interior a cavity 2 intended to contain the working liquid of a hydraulic circuit and which is provided with at least one inlet port 3 and/or with one outlet port 4 which are connectable in a known manner to a hydraulic circuit.
  • the cavity 2 is insulated in an airtight manner from outside inwards and said container is elastically deformable at operating pressures.
  • the container of the tank is made of molded synthetic material, for example oilresistant rubber, which is elastically deformable at the normal operating pressures of the tank.
  • the container is composed of a first portion 5 and of a second portion 6 having a substantially cylindrical configuration which are associated rigidly and coaxially with one another. More particularly, both the first and the second portion are constituted by cylinders, open at one base, and the first portion 5 is partially insertable with its open base in the open base of the second portion 6.
  • means for airtight connection can consist of a cylindrical stiffening body 7 which extends inside the first portion 5 at least in said area and of a cylindrical band 8 which can be tightened externally on the second portion 6 again in said area.
  • the second portion 6 is provided, on its inner surface, still at the superimposition area, with a pair of circumferential raised portions 9 and 10, axially spaced from one another, which are engageable, at the moment of the assembly of the first portion with the second portion, with a pair of circumferential abutments 11 and 12 which are correspondingly defined on the outer surface of the first portion 5 in the area of superimposition.
  • the pair of raised portions 9 and 10 and the pair of abutments 11 and 12 can be optimally employed also for the correct mutual positioning of the portions 5 and 6 during assembly.
  • the second portion 6 has, on its inner surface, in an area intermediate between the pair of raised portions 9 and 10, a third raised portion 13 which is pressed against the outer surface of the first portion 5 in the area of superimposition as an effect of the tightening of the cylindrical band 8.
  • tubular protrusions may be provided on the closed base of the first portion 5, which are to be provided directly during the molding step, for coupling to the hydraulic circuit to be fed.
  • tubular protrusions In the illustrated embodiment six tubular protrusions have been provided, of which: one protrusion 14 which defines the outlet port 4, one protrusion 15 which defines the inlet port 3 and one protrusion 16 with a hole 17 for venting the air during filling of the tank with the working liquid; the tubular protrusions indicated by the numerals 18, 19 and 20 are provided in case the coupling to other ducts of the hydraulic circuit to be served is required, and can be appropriately perforated at assembly time.
  • the second portion 6 is provided, on its lateral surface, proximate to its closed base, with a pair of circumferential abutments 21 and 22, spaced apart from one another and being similar to the circumferential abutments 11 and 12 of the first portion 5 to allow modular composition with another cylindrical portion 24 shaped like the second portion 6 if a tank having a greater volume is required.
  • non-return valve means are furthermore provided for the outward venting of the air from inside the cavity 2.
  • Said valve means can consist of a known valve or of a simple hole 23 provided in an area of the tank which in assembly is arranged upwardly.
  • a negative pressure in its interior causes the closure of the hole 23, while an increase in pressure in its interior causes the opening of said hole and allows the discharge of any air which has infiltrated into the hydraulic circuit due to phenomena of cavitation or to other causes.
  • the tank according to the invention fully achieves the intended aim, since, by virtue of its elastic deformability, it offers adequate assurances against the filtration of air from outside.
  • Another advantage is the possibility of eliminating air which may accidentally form in other areas of the hydraulic circuit.
  • the materials employed may be any according to the requirements and to the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP88102984A 1987-03-06 1988-02-29 Réservoir pour systèmes hydrauliques avec grande sécurité d'infiltration d'air de l'extérieur Withdrawn EP0281052A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT19609/87A IT1202645B (it) 1987-03-06 1987-03-06 Serbatoio per impianti idraulici ad elevata sicurezza contro l'infiltrazione di aria dall'esterno
IT1960987 1987-03-06

Publications (1)

Publication Number Publication Date
EP0281052A1 true EP0281052A1 (fr) 1988-09-07

Family

ID=11159525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102984A Withdrawn EP0281052A1 (fr) 1987-03-06 1988-02-29 Réservoir pour systèmes hydrauliques avec grande sécurité d'infiltration d'air de l'extérieur

Country Status (2)

Country Link
EP (1) EP0281052A1 (fr)
IT (1) IT1202645B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026708A1 (de) * 1989-08-31 1991-03-07 Sema Sarl Schnellvorschubvorrichtung fuer einen einfach wirkenden hydraulischen arbeitszylinder
DE19612593A1 (de) * 1995-03-31 1996-10-02 Trinova Ltd Umlaufhydrauliksystem
EP2426277A1 (fr) 2010-09-06 2012-03-07 Komatsu Hanomag GmbH Section de véhicule avant ou arrière
CN113883106A (zh) * 2021-10-12 2022-01-04 燕山大学 自变容弹性液压油箱及其控制方法
US20230233392A1 (en) * 2021-08-17 2023-07-27 Hawe Hydraulik Se Hydraulic drive unit for a stretcher and stretcher with a hydraulic drive unit
IT202400003562A1 (it) * 2024-02-20 2025-08-20 Marco Bernardi Un serbatoio modulare componibile/smontabile

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001337A (en) * 1963-07-19 1965-08-18 Richier Sa Improvements in or relating to hydraulic systems
GB1030006A (en) * 1963-09-21 1966-05-18 Ulf Ragnar Boye Improved expansion vessel for closed hydraulic systems
FR1508236A (fr) * 1966-11-21 1968-01-05 S E M A Citerne pliable
DE2351267A1 (de) * 1973-10-12 1975-04-17 Geb Berger Edith Sziranyi Ausgleichvorrichtung fuer hydraulikfluessigkeitsbehaelter von hydraulikanlagen
US3935882A (en) * 1974-02-19 1976-02-03 Caterpillar Tractor Co. Hydraulic tank reservoir pressure and vacuum stabilizer system
GB2145161A (en) * 1983-08-19 1985-03-20 Ms International Plc Sump means for machine embodying a hydraulic circuit
GB2160592A (en) * 1984-06-21 1985-12-24 Thames Water Authority Reservoirs for hydraulic systems

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1001337A (en) * 1963-07-19 1965-08-18 Richier Sa Improvements in or relating to hydraulic systems
GB1030006A (en) * 1963-09-21 1966-05-18 Ulf Ragnar Boye Improved expansion vessel for closed hydraulic systems
FR1508236A (fr) * 1966-11-21 1968-01-05 S E M A Citerne pliable
DE2351267A1 (de) * 1973-10-12 1975-04-17 Geb Berger Edith Sziranyi Ausgleichvorrichtung fuer hydraulikfluessigkeitsbehaelter von hydraulikanlagen
US3935882A (en) * 1974-02-19 1976-02-03 Caterpillar Tractor Co. Hydraulic tank reservoir pressure and vacuum stabilizer system
GB2145161A (en) * 1983-08-19 1985-03-20 Ms International Plc Sump means for machine embodying a hydraulic circuit
GB2160592A (en) * 1984-06-21 1985-12-24 Thames Water Authority Reservoirs for hydraulic systems

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026708A1 (de) * 1989-08-31 1991-03-07 Sema Sarl Schnellvorschubvorrichtung fuer einen einfach wirkenden hydraulischen arbeitszylinder
DE4026708C2 (de) * 1989-08-31 2002-10-10 Sema Sarl Schnellvorschubvorrichtung für einen einfach wirkenden hydraulischen Arbeitszylinder
FR2735537A1 (fr) * 1995-03-31 1996-12-20 Trinova Ltd Circuit hydraulique a recyclage
GB2299625A (en) * 1995-03-31 1996-10-09 Trinova Ltd Recirculating hydraulic system
US5727390A (en) * 1995-03-31 1998-03-17 Trinova Limited Re-circulating hydraulic system
GB2299625B (en) * 1995-03-31 1998-12-16 Trinova Ltd Re-circulating hydraulic system
DE19612593A1 (de) * 1995-03-31 1996-10-02 Trinova Ltd Umlaufhydrauliksystem
DE19612593C2 (de) * 1995-03-31 2003-07-31 Trinova Ltd Umlaufhydrauliksystem
EP2426277A1 (fr) 2010-09-06 2012-03-07 Komatsu Hanomag GmbH Section de véhicule avant ou arrière
US20230233392A1 (en) * 2021-08-17 2023-07-27 Hawe Hydraulik Se Hydraulic drive unit for a stretcher and stretcher with a hydraulic drive unit
US12274653B2 (en) * 2021-08-17 2025-04-15 Hawe Hydraulik Se Hydraulic drive unit for a stretcher and stretcher with a hydraulic drive unit
CN113883106A (zh) * 2021-10-12 2022-01-04 燕山大学 自变容弹性液压油箱及其控制方法
IT202400003562A1 (it) * 2024-02-20 2025-08-20 Marco Bernardi Un serbatoio modulare componibile/smontabile

Also Published As

Publication number Publication date
IT8719609A0 (it) 1987-03-06
IT1202645B (it) 1989-02-09

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