GB2160592A - Reservoirs for hydraulic systems - Google Patents

Reservoirs for hydraulic systems Download PDF

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Publication number
GB2160592A
GB2160592A GB08415849A GB8415849A GB2160592A GB 2160592 A GB2160592 A GB 2160592A GB 08415849 A GB08415849 A GB 08415849A GB 8415849 A GB8415849 A GB 8415849A GB 2160592 A GB2160592 A GB 2160592A
Authority
GB
United Kingdom
Prior art keywords
reservoir
expansion member
atmosphere
hydraulic
sealed
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Withdrawn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
GB08415849A
Other versions
GB8415849D0 (en
Inventor
Gordon Johnson
Neville Leonard Denman
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.)
Thames Water Authority
Original Assignee
Thames Water Authority
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 Thames Water Authority filed Critical Thames Water Authority
Priority to GB08415849A priority Critical patent/GB2160592A/en
Publication of GB8415849D0 publication Critical patent/GB8415849D0/en
Publication of GB2160592A publication Critical patent/GB2160592A/en
Withdrawn legal-status Critical Current

Links

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
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
    • F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
    • 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
    • F15B1/265—Supply reservoir or sump assemblies with pressurised main reservoir
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/205—Accumulator cushioning means using gas
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/21—Accumulator cushioning means using springs
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/30—Accumulator separating means
    • F15B2201/315—Accumulator separating means having flexible separating means
    • F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
    • 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
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/41—Liquid ports
    • F15B2201/413—Liquid ports having multiple liquid ports

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)

Abstract

A reservoir is described for a hydraulic system. The interior of the reservoir is sealed or adapted to be sealed from the atmosphere and an expansion member 10, open to the atmosphere and closed to the interior of the reservoir is mounted within the reservoir. The expansion member is resilient to accommodate changes in volume of the hydraulic liquid in the reservoir as the result of temperature changes, and may take the form of a bottle or like container or of a bellows, preferably of plastics. <IMAGE>

Description

SPECIFICATION Reservoirs for hydraulic systems This invention relates to reservoirs for hydraulic systems, particularly hydraulic control systems.
In a hydraulic system, a hydraulic liquid, e.g. an oil, is pumped from a reservoir in the form of a tank to a point of use and returned to the reservoir. In order to allow for variations in volume of the hydraulic liquid as a result of temperature changes during operation of the system, the reservoir is open to the atmosphere. As a result, certain internal areas of the reservoir or an expansion pipe thereof become exposed to the atmosphere with the possibility that condensation of moisture can occur in these areas when so exposed. The resulting condensate can cause corrosion of these areas or may be carried into the system where it can cause corrosion or malfunction of items, such as valves, in the system.Furthermore, in spite of the provision of filters between the interior of the reservoir and the atmosphere, it is virtually impossible to prevent dirt and dust from entering into the reservoir and causing abrasion and malfuction of the system.
It is an object of the invention to obviate or minimise these disadvantages.
Broadly speaking the present invention provides in, or for use in, a hydraulic system, a reservoir, wherein the interior of the reservoir is sealed or adapted to be sealed from the atmosphere, and wherein an expansion member open to the atmosphere is mounted within the reservoir, the expansion member being resilient to accommodate changes in volume of hydraulic liquid in said reservoir.
The provision of an expansion member within the reservoir, permits the whole hydraulic system to be sealed from the atmosphere, since changes in volume of the hydraulic liquid due to temperature changes are compensated by expansion or compression of the expansion member. Thus the possibility of condensation of water in the reservoir and consequent corrosion or malfunction are avoided.
The present invention also provides a hydraulic system, wherein the system comprises a reservoir, pump means, operating means responsive to the provision of hydraulic liquid supplied from the reservoir by said pump means, and conduit means for transporting hydraulic liquid from the reservoir, through the system and back to the reservoir, and wherein an expansion member is mounted in the interior of the reservoir and is open to the atmosphere and the interior of the reservoir and the hydraulic system are sealed from the atmosphere.
It will be appreciated that the expansion member can be of any desired shape and is conveniently in the form of a bottle or like container made of resilient plastics material which is resistant to the hydraulic liquid.
Alternatively, the expansion member may be in the form of a bellows of plastics, rubber or even metal, the latter possibly incorporating a spring under compression in order to facilitate expansion.
In order to enable the invention to be more readily understood, reference will now be made to the accompanying drawing which illustrates diagrammatically and by way of example an embodiment thereof and which is a section through the reservoir of a hydraulic system.
Referring now to the drawing, there is shown a reservoir for a hydraulic system. The reservoir is in the form of a rectangular section tank 1 with a lid 2 fixed to the tank as by welding or other conventional method not described in further detail. The lid 2 is formed with an aperture 3 and has a filling aperture 4 sealed by a cap 5 and fitted with a filter 6.
The aperture 3 is covered by a plate 7 secured as by bolts indicated at 8 to the lid 2 with the interposition of a sealing gasket 9.
The plate 7, which may be circular or rectangular in shape, is formed with a central aperture in which an expansion member in the form of a plastics bottle 10 is mounted. The bottle 10 has an externally threaded neck 11 and is formed below its neck with a discshaped flange 1 2. The bottle is held with the flange 1 2 abutting against the underside of the plate 7 by a nut 14 engaging the external threading of the neck 11, there being a washer 1 5 interposed between the nut and the plate. The bottle is closed by a cap 1 6 formed with an aperture 1 7 the size of which may be chosen in accordance with the size of the bottle or the required characteristics of the system.
The tank 1 also has a sump 18, an outlet pipe 1 9 leading to a pump and inlet pipes 20 for returned hydraulic liquid.
In setting up the hydraulic system just described, after all joints have been made, the reservoir is filled with hydraulic liquid through the filling aperture 4 until full. The pump is then operated to convey the liquid through the system and the reservoir is again filled and the cap 5 screwed on tight so that the interior of the system is full of hydraulic liquid without any air present and is sealed from the ambient atmosphere. If the temperature of hydraulic liquid changes during operation of the hydraulic system resulting in a change in the overall volume of the hydraulic liquid, such changes in volume are accommodated by appropriate expansion or contraction of the plastics bottle 10, the response of the bottle being governed to some extent by the size of the aperture 1 7 in the cap 16.
The use of the plastics bottle enables a completely sealed hydraulic system to be pro vided which contains no air or oxygen and in which there is no dead space in which condensation of moisture can occur. Thus the opportunities for corrosion to occur within the system are eliminated or considerably reduced.
Since the tank 2 no longer has to be open to the atmosphere and to have a sufficient space to accommodate changes in level consequent upon changes in volume of the hydraulic liquid, there are no longer the same constraints on the shape of the reservoir which can be of any desired shape. Furthermore, the tank could be made of plastics material with an integrally moulded plastics bottle or like container.
The plastics material of which the bottle may be made is one which is resilient and resistant to the hydraulic liquid.

Claims (9)

1. In, or for use in a hydraulic system, a reservoir, wherein the interior of the reservoir is sealed or adapted to be sealed from the atmosphere, and wherein an expansion member open to the atmosphere and closed to the interior of the reservoir is mounted within the reservoir, the expansion member being resilient to accommodate changes in volume of hydraulic liquid in said reservoirs.
2. A reservoir as claimed in Claim 1, wherein the expansion member is in the form of a bottle or like container of resilient plastics material which is resistant to the hydraulic liquid.
3. A reservoir as claimed in Claim 1, wherein the expansion member is in the form of a bellows.
4. A reservoir as claimed in Claim 3, wherein the bellows is made of rubber or plastics.
5. A reservoir as claimed in Claim 3, wherein the bellows is made of metal and incorporates a spring under compression to facilitate expansion.
6. A reservoir as claimed in any one of Claims 1 to 5, wherein the reservoir is formed with an aperture to receive the expansion member, and wherein the expansion member is secured in a mounting adapted to seal the aperture.
7. A reservoir as claimed in any one of Claims 1 to 6, wherein the expansion member is closed by a cap formed with a control aperture.
8. In, or for use in a hydraulic system, a reservoir substantially as hereinbefore described with reference to the accompanying drawings.
9. A hydraulic system, wherein the system comprises a reservoir as claimed in any preceding claim, pump means, operating means responsive to the provision of hydraulic liquid supplied from the reservoir by said pump means, and conduit means for transporting hydraulic liquid from the reservoir, through the system and back to the reservoir, the expansion member of the reservoir being open to the atmosphere and the interior of the reservoir and the hydraulic system being sealed from the atmosphere.
GB08415849A 1984-06-21 1984-06-21 Reservoirs for hydraulic systems Withdrawn GB2160592A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08415849A GB2160592A (en) 1984-06-21 1984-06-21 Reservoirs for hydraulic systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08415849A GB2160592A (en) 1984-06-21 1984-06-21 Reservoirs for hydraulic systems

Publications (2)

Publication Number Publication Date
GB8415849D0 GB8415849D0 (en) 1984-07-25
GB2160592A true GB2160592A (en) 1985-12-24

Family

ID=10562770

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08415849A Withdrawn GB2160592A (en) 1984-06-21 1984-06-21 Reservoirs for hydraulic systems

Country Status (1)

Country Link
GB (1) GB2160592A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281052A1 (en) * 1987-03-06 1988-09-07 CAMPISA S.r.l. Tank for hydraulic systems with high safety against infiltration of air from outside
WO1995020106A1 (en) * 1994-01-24 1995-07-27 Applied Power Inc. Vented hydraulic fluid reservoir
CN101900138A (en) * 2010-08-11 2010-12-01 内蒙古北方重工业集团有限公司 Exposed drive full online leak sealing hydraulic oil tank
WO2011042108A1 (en) * 2009-10-07 2011-04-14 Hydac System Gmbh Low-pressure supply tank
CN103591059A (en) * 2013-11-19 2014-02-19 徐工集团工程机械股份有限公司科技分公司 High-placed negative-pressure totally-enclosed hydraulic oil tank
WO2016203275A3 (en) * 2015-06-19 2017-03-09 Oxford University Innovation Limited Apparatus and method for protecting a pressurised fluid system from excessive pressure
DE102017006305A1 (en) * 2017-07-04 2019-01-10 Hydac Technology Gmbh Balancing device, in particular in the form of a tank

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112963392B (en) * 2021-01-26 2022-11-29 中国科学院国家天文台 Constant-volume and constant-pressure inflating device and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1467106A (en) * 1974-04-17 1977-03-16 Eder A Pressure balancing device for heating systems
US4052852A (en) * 1976-11-22 1977-10-11 Caterpillar Tractor Co. Constant pressure sealed fluid storage tank for hydraulic systems

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1467106A (en) * 1974-04-17 1977-03-16 Eder A Pressure balancing device for heating systems
US4052852A (en) * 1976-11-22 1977-10-11 Caterpillar Tractor Co. Constant pressure sealed fluid storage tank for hydraulic systems

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281052A1 (en) * 1987-03-06 1988-09-07 CAMPISA S.r.l. Tank for hydraulic systems with high safety against infiltration of air from outside
WO1995020106A1 (en) * 1994-01-24 1995-07-27 Applied Power Inc. Vented hydraulic fluid reservoir
US5465576A (en) * 1994-01-24 1995-11-14 Applied Power Inc. Vented hydraulic fluid reservoir
WO2011042108A1 (en) * 2009-10-07 2011-04-14 Hydac System Gmbh Low-pressure supply tank
CN101900138A (en) * 2010-08-11 2010-12-01 内蒙古北方重工业集团有限公司 Exposed drive full online leak sealing hydraulic oil tank
CN103591059A (en) * 2013-11-19 2014-02-19 徐工集团工程机械股份有限公司科技分公司 High-placed negative-pressure totally-enclosed hydraulic oil tank
CN103591059B (en) * 2013-11-19 2015-09-16 徐工集团工程机械股份有限公司科技分公司 Height puts the totally-enclosed hydraulic oil container of negative pressure
WO2016203275A3 (en) * 2015-06-19 2017-03-09 Oxford University Innovation Limited Apparatus and method for protecting a pressurised fluid system from excessive pressure
DE102017006305A1 (en) * 2017-07-04 2019-01-10 Hydac Technology Gmbh Balancing device, in particular in the form of a tank
US11168706B2 (en) 2017-07-04 2021-11-09 Hydac Technology Gmbh Equalization device, in particular in the form of a tank

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Publication number Publication date
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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)