EP0120152A1 - Appareil pour minimiser les pertes de fluide d'une partie composante d'un système hydraulique en cas de panne de la partie composante - Google Patents

Appareil pour minimiser les pertes de fluide d'une partie composante d'un système hydraulique en cas de panne de la partie composante Download PDF

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Publication number
EP0120152A1
EP0120152A1 EP83301481A EP83301481A EP0120152A1 EP 0120152 A1 EP0120152 A1 EP 0120152A1 EP 83301481 A EP83301481 A EP 83301481A EP 83301481 A EP83301481 A EP 83301481A EP 0120152 A1 EP0120152 A1 EP 0120152A1
Authority
EP
European Patent Office
Prior art keywords
chamber
fluid
component
tank
level
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.)
Granted
Application number
EP83301481A
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German (de)
English (en)
Other versions
EP0120152B1 (fr
Inventor
Donald James Reid
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.)
British Gas PLC
Original Assignee
British Gas Corp
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 British Gas Corp filed Critical British Gas Corp
Priority to DE8383301481T priority Critical patent/DE3372118D1/de
Priority to EP19830301481 priority patent/EP0120152B1/fr
Publication of EP0120152A1 publication Critical patent/EP0120152A1/fr
Application granted granted Critical
Publication of EP0120152B1 publication Critical patent/EP0120152B1/fr
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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder

Definitions

  • This invention relates to an apparatus for minimising the amount of fluid leaked from a component in a. hydraulic power system when the component has failed such as for example a hose-burst.
  • Hand-held hydraulic tools such as roadbreakers and rock drills are supplied with the hydraulic operating fluid by way of hoses which are connected via a power source prime mover such as a diesel or petrol engine to a tank serving as a reservoir for the fluid.
  • hoses are subject to severe wear and tear during use and as a result frequently split or crack. Since the hydraulic fluid continuously circulates through these hoses at pressures of at least 200 psi even when the tools are not being operated ie during standby or rest periods, fluid leaks at high velocity through such fissures in the hose wall. This may lead to a quite substantial loss of the expensive operating fluid and will create an unacceptable hazard to the site operatives and the environment.
  • the leakage can be kept to tolerably acceptable levels should an operative notice the leak quickly enough and deactivate the prime mover. However, in most cases, and particularly where the hoses are long, the operative may not notice the leak until significant fluid loss has occurred.
  • apparatus for minimising the amount of fluid leaked from,a component in a hydraulic power system when the component has failed, the apparatus comprising a tank for use as the reservoir for the hydraulic fluid, the tank having a first chamber for storing a main volume of the fluid and a second chamber communicating with the first chamber for storing a reference volume of the fluid above the main volume and means for deactivating the system power source when the quantity of fluid in the second chamber has fallen to or below a preset level as a result of its leakage from the system, the chambers being so dimensioned that for a given quantity of fluid entering or leaving the tank, fluid level fluctuation in the second chamber is greater than the corresponding fluid level fluctuation which would occur in the first chamber if the fluid were only entering or leaving the first chamber.
  • the means for deactivating the power source comprises a fluid level switch located in the second chamber.
  • the tank includes an expansion chamber communicating with the second chamber.
  • a hydraulic power system includes the apparatus defined above.
  • the apparatus comprises a tank 1 providing a reservoir for a hydraulic fluid which is to serve as the working fluid in a conventional hydraulic power system incorporating hoses and other like components and a power source such as a diesel or petrol engine.
  • the tank 1 comprises a lowermost chamber 2 for storing a main or major volume of the fluid, an upper chamber 3 for storing a reference minor volume of the fluid and an upper chamber 4 communicating with the chamber 3 serving as an expansion chamber.
  • the upper chambers 3 and 4 are housed in an extension 5 to the lowermost chamber 2.
  • the top wall 6 of the lowermost chamber 2 is provided with an inlet 7 for fluid returning from the system after use while the lower wall 8 of the chamber 2 is provided with an outlet 9 to supply fluid to the system for use.
  • the upper chamber 3 is formed between the front wall 10 of the tank 1 and an open-ended vertical channel component 11 which is welded to the wall 10.
  • the expansion chamber 4 is formed within the extension 5 by means of a flange 12 extending from the base of the channel component 11 and welded to the adjacent walls 10,13,14 and 15 of the tank 1.
  • the channel component 11 terminates short of the top wall 16 of the extension 5 and a series of drain holes 17 is provided in each of the walls 18, 19 and 20 of the component 11 close to the base thereof.
  • the holes 17 provide access for fluid to enter the expansion chamber 4 from the chamber 3 or leave the expansion chamber 4 to enter the chamber 3.
  • a. conventional oil filter element 21 for an oil filter or breather, the element 21 extending into the chamber 3 formed by the channel component 11.
  • a conventional fluid level gauge 22 mounted on the wall 15 of the tank 1 is a conventional fluid level gauge 22 to provide a visual indication of the fluid level in the expansion chamber 4.
  • a conventional fluid level limit switch 23 shown in schematic form).
  • This switch 23 is electrically connected by means (not shown) to the power source for example, a petrol or diesel engine, so that when the fluid in the chamber 3 falls to the level of the switch 23, the switch 23 switches off the power source to cause circulation of the fluid within the system to cease.
  • the power source for example, a petrol or diesel engine
  • the fluid 24 fills the lowermost chamber 2 and forms a column 25 in the chamber 3, above the level of the switch 23.
  • the level 26 of fluid in the chamber 3 remains substantially constant if operation is normal but in any case the fluid column 25 forms a fluid reference volume and because of the relative dimensions of the chambers 2 and 3, fluid level fluctuations in the reference chamber 3 are much greater than those in the lower chamber 2 if the same volume of fluid were entering or leaving only the lower chamber. Hence a small quantity of fluid lost from the main chamber 2 will result in a rapid and considerable change in fluid level in the reference volume.
  • the volume of the fluid leaked from the tank 1 during failure of a component can be limited to an extremely low level.
  • a manual override should be fitted to the fluid level switch to prevent the power source being cut out while topping up the fluid reservoir after maintenance or repairs.
  • the apparatus substantially eleiminates the problem of fluid expansion through the temperature range associated with outdoor work.

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)
EP19830301481 1983-03-17 1983-03-17 Appareil pour minimiser les pertes de fluide d'une partie composante d'un système hydraulique en cas de panne de la partie composante Expired EP0120152B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8383301481T DE3372118D1 (en) 1983-03-17 1983-03-17 Apparatus for minimising the amount of fluid leaked from a component in a hydraulic system when the component has failed
EP19830301481 EP0120152B1 (fr) 1983-03-17 1983-03-17 Appareil pour minimiser les pertes de fluide d'une partie composante d'un système hydraulique en cas de panne de la partie composante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830301481 EP0120152B1 (fr) 1983-03-17 1983-03-17 Appareil pour minimiser les pertes de fluide d'une partie composante d'un système hydraulique en cas de panne de la partie composante

Publications (2)

Publication Number Publication Date
EP0120152A1 true EP0120152A1 (fr) 1984-10-03
EP0120152B1 EP0120152B1 (fr) 1987-06-16

Family

ID=8191090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830301481 Expired EP0120152B1 (fr) 1983-03-17 1983-03-17 Appareil pour minimiser les pertes de fluide d'une partie composante d'un système hydraulique en cas de panne de la partie composante

Country Status (2)

Country Link
EP (1) EP0120152B1 (fr)
DE (1) DE3372118D1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR577250A (fr) * 1924-02-16 1924-09-02 Appareil pour indiquer le niveau du liquide contenu dans un réservoir et avertir quand ce niveau descend au-dessous d'une certaine limite
FR919822A (fr) * 1946-01-07 1947-03-19 Automobiles De Dion Bouton Dispositif protecteur d'un moteur thermique ou de toute autre machine contre le manque d'eau de refroidissement
FR1435198A (fr) * 1965-03-06 1966-04-15 Garnier & Cie A Procédé et dispositif pour la protection des moteurs thermiques à refroidissementpar liquide
US3832982A (en) * 1973-09-10 1974-09-03 H Guehr Coolant loss or coolant pump malfunction detection system for internal combustion engines
DE2715569A1 (de) * 1977-04-07 1978-10-12 Volkswagenwerk Ag Vorrichtung zum abschalten einer hydraulikanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR577250A (fr) * 1924-02-16 1924-09-02 Appareil pour indiquer le niveau du liquide contenu dans un réservoir et avertir quand ce niveau descend au-dessous d'une certaine limite
FR919822A (fr) * 1946-01-07 1947-03-19 Automobiles De Dion Bouton Dispositif protecteur d'un moteur thermique ou de toute autre machine contre le manque d'eau de refroidissement
FR1435198A (fr) * 1965-03-06 1966-04-15 Garnier & Cie A Procédé et dispositif pour la protection des moteurs thermiques à refroidissementpar liquide
US3832982A (en) * 1973-09-10 1974-09-03 H Guehr Coolant loss or coolant pump malfunction detection system for internal combustion engines
DE2715569A1 (de) * 1977-04-07 1978-10-12 Volkswagenwerk Ag Vorrichtung zum abschalten einer hydraulikanlage

Also Published As

Publication number Publication date
DE3372118D1 (en) 1987-07-23
EP0120152B1 (fr) 1987-06-16

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