CA1188959A - Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed - Google Patents
Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failedInfo
- Publication number
- CA1188959A CA1188959A CA000425071A CA425071A CA1188959A CA 1188959 A CA1188959 A CA 1188959A CA 000425071 A CA000425071 A CA 000425071A CA 425071 A CA425071 A CA 425071A CA 1188959 A CA1188959 A CA 1188959A
- Authority
- CA
- Canada
- 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.)
- Expired
Links
Landscapes
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
ABSTRACT Figure 1 This invention relates to apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed.
The apparatus comprises a tank 1 for use as a reservoir for the hydraulic fluid, the tank 1 having a first chamber 2 for storing a main volume of the fluid and a second chamber 3 communicating with the first chamber 2 for storing a reference volume of the fluid. The second chamber 3 is provided with a fluid level switch 23 which deactiates the system power source when the quantity of fluid in the second chamber 3 has fallen to or below a preset level as a result of its leakage from the system via a burst hose or the like. The chambers 2 and 3 are dimensioned so that for a given quantity of fluid entering or leaving the tank 1, fluid level fluctuation in the second chamber 3 is greater than the corresponding fluid level fluotuation which would occur in the first chamber 1 if the fluid were only entering or leaving the first chamber 2.
The apparatus comprises a tank 1 for use as a reservoir for the hydraulic fluid, the tank 1 having a first chamber 2 for storing a main volume of the fluid and a second chamber 3 communicating with the first chamber 2 for storing a reference volume of the fluid. The second chamber 3 is provided with a fluid level switch 23 which deactiates the system power source when the quantity of fluid in the second chamber 3 has fallen to or below a preset level as a result of its leakage from the system via a burst hose or the like. The chambers 2 and 3 are dimensioned so that for a given quantity of fluid entering or leaving the tank 1, fluid level fluctuation in the second chamber 3 is greater than the corresponding fluid level fluotuation which would occur in the first chamber 1 if the fluid were only entering or leaving the first chamber 2.
Description
~8~3~5~
This invention relate~ to an apparatus ~or minim~sing the amount of ~luid leaked ~rom a component in a hydraulic power system when the component has ~ailed such as ~or example a hose-burst.
Hand-held hydraulic tools such as roadbreak rs 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 ~erving as a reservoir for the fluid. Such ho~es are sub~ect to severe wear and tear during use and as a result frequently ~plit or crack. Since the hydraulic fluid cortinuou~ly circulates through these hoses at pres~ures of at least 200 psi even when the tools are not being operated ie during 3tandby or rest periods, ~luid leaks at high velocity through such fissures in the hose wall. This may lead to a quite substantial loss o~ the expensive operatiDg fluid and will create an unacceptable hazard to the site operatives and the envlronment.
In so~e cases the leakage can be kept to tolerably aoceptable lsvels ~hould an operati~e ~otice the lea~
quickly enough and deactivate the prime mover. However, in most case3, snd particularly where the hoses are long9 the operati~e may not notice the leak until significa~t ~luid loss has occurred.
, 8~3S~
It is therefore an object of the pre~ent invention to provide an apparatus for minimising the amount of f.uld leaked from a component in a hydraulic po~er sy~tem when the component has failedO
According to one aspect of the present lnventlon, there is provided apparatus for minimislng the amount o~
fluid leaked from,a component in a hydraulic power system ~hen the cOmpQnent ~as failed, the apparatus comprising a tank for use as the reservoir ~or the hydraulic ~luid, the tank having a first chamber for storing a main volu~e of the flu$d and a second ohamber communicating with the flrqt chamber for storing a re~erence volume of the ~luid above the main volume and means ~or deactivating the ~ystem power source when the quantity of fluid in the second chamber has ~allen to or below a pre~et level as a re~ult of it~
leakage from the ~y~tem, the chambers being so dlmensloned that for a given quantity o~ fluid enter$ng or lea~$ng the tank9 Pluid level fluctuation in the second chamber ls greater than the correspo~din$ fluid level fluctuatlon wbleh ~ould occur in tbe first chamber lf the fluld were only entering or leavlng the fir~t chamber.
Preferably the means for deactivating the power sour¢e aompri~e~ a fluld level switch looated in the ~econd chamber.
Suitably the tan~ includes an expansion chamber communicating with the second chamber.
Acoording to another aspect of the preserlt invention a hydraulic power ~ystem includes the apparatus defined above.
An e~bodi~ert of the invention will now be described with reference to the accompanying drawings in which:-Figure 1 is a perspective schematic view of the apparatuspartially cut away at the front to reveal an internal portion thereoP, Figure 2 i3 a front view o~ the apparatus showing the fluid level during normal operation a~d Figure 3 i3 a view similar to ~hat shown in Figure 2 ~howlng the ~luid level after shut-down of the system.
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 lrcorporatlng hoses a~d other like components and a po~er source such a~ a diesel or petrol engine.
The tank 1 comprises a lowermost chamber 2 for storing a main or ma~or volume of the ~luid7 an upper chamber 3 for 5~
storing a reference minor volu~e of the fluid and an upper chamber 4 communicatin~, with the chamber 3 serving aq an expan~ion cha~ber~ The upper chambers 3 and 4 are housed in an extension 5 to the lowermost chamber 2~
The top wall 6 o~ the lowermost cha~ber 2 is provided with an inlet 7 for ~luid returning from the ~ystem a~ter use while the lower wall 8 of the chamber 2 is provided ~ith an outlet 9 to ~upply fluid to the system for u~e.
The upper chamber 3 i3 Pormed between the front wall 10 o~ the tank 1 and an open-ended vertlcal channel component 11 which is ~elded to the wall 10. The expansion chamber 4 i9 formed w$thin the extension 5 by means ~f a ~lange 12 extendine ~rom the base o~ ths channel component 11 and welded to the adjacent walls 10,13,14 and 15 o~ the ta~k l.
The channel component 11 kerminates short oP the top wall 16 Or the extension 5 and a serie~ o~ drain holes 17 is provided in each of the walls 18 9 19 and 20 o~ the compo~ent 11 close to tbe base thereo~. The hole~ 17 provide acces~ for fluld to enter the expansion chamber 4 ~ro~ the ohamber 3 or leaYe the expanslo~ chamber 4 to snter the chamber 3. Depending from the top wall 16 oP the extension 5 ls a conventional oil ~ilter ele~ent 21 Por an oil ~ilter or breather, the element 21 extending into the chamher 3 formed by the channel oomponent 11. Mounted on the wall 15 of the tanh 1 is a conventional fluid level gauge 22 to provide a visual indication of the fluid lPvel in the expansion chamber 4. Located at a po~ition just above the drain holes 17 is a conYentional fluid le~vel limit switch 23 (shown in schematic ~orm). This ~witch 23 is electrically connected by means (not shown) to the power ~ource for example, a petrol or diesel engine, so that when the ~luid ln the chamber 3 falls to the level of the switch 23, the switch 23 switches of~ the power source to cau~e cireulation of the fluid within the system to cease.
Referring to Figure 2, during normal operation of the sy~tem9 the fluid 24 fills the lowermo~t cha~ber 2 and ~orms a column 25 in the chamber 3, above the level o~ the switch 230 The level 2S o~ fluid in the chamber 3 remains ~ubstantially con3tant if operation i9 normal but in any ca~e the flu~d column 25 ~orms a fluid reference volume and because of the relatiYe dimensions o~ the chambers 2 and 3, fluld level fluctuations in the reference cha~ber 3 are ~uch greater than those in the lower ~ha~ber ~ if the same volu~e of fluid were entering or leaving only the lower chamber. Hence a small quantity of ~luid lost ~rom the main chamber 2 wlll result ln a rapid and onsiderable change in ~Iuid level in the reference volu~e.
Referrlng to Figure 3, i~ a leakage occurs in the ~y~tem a~ a result of a hose split or the like, fluid 2~
will leave the tank I and the level 26 of fluid in the reference chamber 3 wlll fall until it reaches the limit switoh as shown in Figure 3. At this stage, the s~itch 23 will cut of~ the power source to prevent further leakage of fluid from the system. The drain holes 17 are dimensioned so a~ to prevent replenishing o~ the refere~ce volume from the expansion chamber 3 by en~uring the flow rate through these holes is much le~s than the loss rate from the reference volume .once a serious leak develops in the ~ystem.
By suitable selection of the dimensions of the re~erence chamber 3, the volume of the fluid leaked from the tank 1 during failure of a component can be limited to an extremely lo~ level~
A manual override should be fitted to the fluid level switch to prevent the po~er source being cut out while topping up the fluid reservoir after maintenanoe or repairsO
The apparatus substantially eleiminates t~e problem of ~luid expansion through the temperature range asRociated with outdoor work.
This invention relate~ to an apparatus ~or minim~sing the amount of ~luid leaked ~rom a component in a hydraulic power system when the component has ~ailed such as ~or example a hose-burst.
Hand-held hydraulic tools such as roadbreak rs 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 ~erving as a reservoir for the fluid. Such ho~es are sub~ect to severe wear and tear during use and as a result frequently ~plit or crack. Since the hydraulic fluid cortinuou~ly circulates through these hoses at pres~ures of at least 200 psi even when the tools are not being operated ie during 3tandby or rest periods, ~luid leaks at high velocity through such fissures in the hose wall. This may lead to a quite substantial loss o~ the expensive operatiDg fluid and will create an unacceptable hazard to the site operatives and the envlronment.
In so~e cases the leakage can be kept to tolerably aoceptable lsvels ~hould an operati~e ~otice the lea~
quickly enough and deactivate the prime mover. However, in most case3, snd particularly where the hoses are long9 the operati~e may not notice the leak until significa~t ~luid loss has occurred.
, 8~3S~
It is therefore an object of the pre~ent invention to provide an apparatus for minimising the amount of f.uld leaked from a component in a hydraulic po~er sy~tem when the component has failedO
According to one aspect of the present lnventlon, there is provided apparatus for minimislng the amount o~
fluid leaked from,a component in a hydraulic power system ~hen the cOmpQnent ~as failed, the apparatus comprising a tank for use as the reservoir ~or the hydraulic ~luid, the tank having a first chamber for storing a main volu~e of the flu$d and a second ohamber communicating with the flrqt chamber for storing a re~erence volume of the ~luid above the main volume and means ~or deactivating the ~ystem power source when the quantity of fluid in the second chamber has ~allen to or below a pre~et level as a re~ult of it~
leakage from the ~y~tem, the chambers being so dlmensloned that for a given quantity o~ fluid enter$ng or lea~$ng the tank9 Pluid level fluctuation in the second chamber ls greater than the correspo~din$ fluid level fluctuatlon wbleh ~ould occur in tbe first chamber lf the fluld were only entering or leavlng the fir~t chamber.
Preferably the means for deactivating the power sour¢e aompri~e~ a fluld level switch looated in the ~econd chamber.
Suitably the tan~ includes an expansion chamber communicating with the second chamber.
Acoording to another aspect of the preserlt invention a hydraulic power ~ystem includes the apparatus defined above.
An e~bodi~ert of the invention will now be described with reference to the accompanying drawings in which:-Figure 1 is a perspective schematic view of the apparatuspartially cut away at the front to reveal an internal portion thereoP, Figure 2 i3 a front view o~ the apparatus showing the fluid level during normal operation a~d Figure 3 i3 a view similar to ~hat shown in Figure 2 ~howlng the ~luid level after shut-down of the system.
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 lrcorporatlng hoses a~d other like components and a po~er source such a~ a diesel or petrol engine.
The tank 1 comprises a lowermost chamber 2 for storing a main or ma~or volume of the ~luid7 an upper chamber 3 for 5~
storing a reference minor volu~e of the fluid and an upper chamber 4 communicatin~, with the chamber 3 serving aq an expan~ion cha~ber~ The upper chambers 3 and 4 are housed in an extension 5 to the lowermost chamber 2~
The top wall 6 o~ the lowermost cha~ber 2 is provided with an inlet 7 for ~luid returning from the ~ystem a~ter use while the lower wall 8 of the chamber 2 is provided ~ith an outlet 9 to ~upply fluid to the system for u~e.
The upper chamber 3 i3 Pormed between the front wall 10 o~ the tank 1 and an open-ended vertlcal channel component 11 which is ~elded to the wall 10. The expansion chamber 4 i9 formed w$thin the extension 5 by means ~f a ~lange 12 extendine ~rom the base o~ ths channel component 11 and welded to the adjacent walls 10,13,14 and 15 o~ the ta~k l.
The channel component 11 kerminates short oP the top wall 16 Or the extension 5 and a serie~ o~ drain holes 17 is provided in each of the walls 18 9 19 and 20 o~ the compo~ent 11 close to tbe base thereo~. The hole~ 17 provide acces~ for fluld to enter the expansion chamber 4 ~ro~ the ohamber 3 or leaYe the expanslo~ chamber 4 to snter the chamber 3. Depending from the top wall 16 oP the extension 5 ls a conventional oil ~ilter ele~ent 21 Por an oil ~ilter or breather, the element 21 extending into the chamher 3 formed by the channel oomponent 11. Mounted on the wall 15 of the tanh 1 is a conventional fluid level gauge 22 to provide a visual indication of the fluid lPvel in the expansion chamber 4. Located at a po~ition just above the drain holes 17 is a conYentional fluid le~vel limit switch 23 (shown in schematic ~orm). This ~witch 23 is electrically connected by means (not shown) to the power ~ource for example, a petrol or diesel engine, so that when the ~luid ln the chamber 3 falls to the level of the switch 23, the switch 23 switches of~ the power source to cau~e cireulation of the fluid within the system to cease.
Referring to Figure 2, during normal operation of the sy~tem9 the fluid 24 fills the lowermo~t cha~ber 2 and ~orms a column 25 in the chamber 3, above the level o~ the switch 230 The level 2S o~ fluid in the chamber 3 remains ~ubstantially con3tant if operation i9 normal but in any ca~e the flu~d column 25 ~orms a fluid reference volume and because of the relatiYe dimensions o~ the chambers 2 and 3, fluld level fluctuations in the reference cha~ber 3 are ~uch greater than those in the lower ~ha~ber ~ if the same volu~e of fluid were entering or leaving only the lower chamber. Hence a small quantity of ~luid lost ~rom the main chamber 2 wlll result ln a rapid and onsiderable change in ~Iuid level in the reference volu~e.
Referrlng to Figure 3, i~ a leakage occurs in the ~y~tem a~ a result of a hose split or the like, fluid 2~
will leave the tank I and the level 26 of fluid in the reference chamber 3 wlll fall until it reaches the limit switoh as shown in Figure 3. At this stage, the s~itch 23 will cut of~ the power source to prevent further leakage of fluid from the system. The drain holes 17 are dimensioned so a~ to prevent replenishing o~ the refere~ce volume from the expansion chamber 3 by en~uring the flow rate through these holes is much le~s than the loss rate from the reference volume .once a serious leak develops in the ~ystem.
By suitable selection of the dimensions of the re~erence chamber 3, the volume of the fluid leaked from the tank 1 during failure of a component can be limited to an extremely lo~ level~
A manual override should be fitted to the fluid level switch to prevent the po~er source being cut out while topping up the fluid reservoir after maintenanoe or repairsO
The apparatus substantially eleiminates t~e problem of ~luid expansion through the temperature range asRociated with outdoor work.
Claims (5)
1. 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 located immediately above the first chamber and communicating with the first chamber for storing a reference volume of the fluid 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.
2. Apparatus as claimed in Claim 1 in which the means for deactivating the power source comprises a fluid level switch located in the second chamber.
3. Apparatus as claimed in Claim 1 in which the tank includes an expansion chamber communicating with the second chamber but isolated from the first chamber.
4. Apparatus as claimed in Claim 2 in which the tank includes an expansion chamber communicating with the second chamber but isolated from the first chamber.
5. A hydraulic power system including apparatus as claimed in Claim 1, 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425071A CA1188959A (en) | 1983-03-31 | 1983-03-31 | Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000425071A CA1188959A (en) | 1983-03-31 | 1983-03-31 | Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1188959A true CA1188959A (en) | 1985-06-18 |
Family
ID=4124917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425071A Expired CA1188959A (en) | 1983-03-31 | 1983-03-31 | Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1188959A (en) |
-
1983
- 1983-03-31 CA CA000425071A patent/CA1188959A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4916938A (en) | Valve leakage inspection, testing and maintenance process | |
| US3910102A (en) | Liquid volumetric line leak testing apparatus and method | |
| US6655135B2 (en) | Construction machine | |
| KR20150136053A (en) | Hydraulic system for construction machine, provided with protection device | |
| KR880002629B1 (en) | Interal oil pressure sensor | |
| JP2005321094A (en) | Hydraulic control valve which can improve response of holding valve | |
| US4513774A (en) | Apparatus for minimizing the amount of fluid leaked from a component in a hydraulic power system when the system has failed | |
| CA1188959A (en) | Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed | |
| NL8100608A (en) | WELL PUMP METHOD AND DEVICE. | |
| KR100551941B1 (en) | Transformer insulation reinforcement apparatus | |
| WO2012134302A2 (en) | Method and device for preventing a mud relief valve from incorrect opening | |
| EP0120152B1 (en) | Apparatus for minimising the amount of fluid leaked from a component in a hydraulic system when the component has failed | |
| US3734202A (en) | Automatic feed control system | |
| GB2115071A (en) | Apparatus for minimising the amount of fluid leaked from a component in a hydraulic power system when the component has failed | |
| CN105156838A (en) | Corrosion resistance method of buried casing internal pipeline | |
| US3698838A (en) | Automatic fluid supply and control means | |
| CA1179562A (en) | Boiler low water level sensing device | |
| NO155160B (en) | DEVICE FOR AA REDUCE THE AMOUNT OF FLUID LEAKING FROM A COMPONENT IN A HYDRAULIC SYSTEM IF THE COMPONENT FAILS. | |
| KR20040104093A (en) | An apparatus for sensing water level in water sealed device of gas conduit | |
| KR100737833B1 (en) | Automatic controller for grout injection, the injection system and the control method | |
| JPS59183103A (en) | Device for minimizing quantity of fluid leaking from constituent on damage of constituent in hydraulic power system | |
| ZA200401792B (en) | Method for restricting leakage of hydraulic oil in a rock drilling rig | |
| JP3552439B2 (en) | Sprinkler fire extinguishing equipment | |
| EP0115106A1 (en) | Boiler low water cut-off | |
| JPH05504324A (en) | Method and apparatus for providing enhanced operational safety for liquefied gas underground storage devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |