EP2154104A1 - Installation pour la distribution de fluide dans un atelier - Google Patents

Installation pour la distribution de fluide dans un atelier Download PDF

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Publication number
EP2154104A1
EP2154104A1 EP08425492A EP08425492A EP2154104A1 EP 2154104 A1 EP2154104 A1 EP 2154104A1 EP 08425492 A EP08425492 A EP 08425492A EP 08425492 A EP08425492 A EP 08425492A EP 2154104 A1 EP2154104 A1 EP 2154104A1
Authority
EP
European Patent Office
Prior art keywords
pump
plant
signal
fluid
delivery station
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
EP08425492A
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German (de)
English (en)
Other versions
EP2154104B1 (fr
Inventor
Giuseppe Virga
Elio Baschieri
Lino Di Betta
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.)
Filcar SpA
Original Assignee
Filcar SpA
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 Filcar SpA filed Critical Filcar SpA
Priority to EP08425492A priority Critical patent/EP2154104B1/fr
Priority to AT08425492T priority patent/ATE535491T1/de
Publication of EP2154104A1 publication Critical patent/EP2154104A1/fr
Application granted granted Critical
Publication of EP2154104B1 publication Critical patent/EP2154104B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02—Stopping, starting, unloading or idling control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2207/00—External parameters
    • F04B2207/70—Warnings
    • F04B2207/703—Stopping

Definitions

  • the present invention relates to a plant for distribution of fluids in a workshop, also referred to as "workshop fluids”.
  • workshop fluids are oil for motors, oil for braking systems, oil for differential gears, oil for gearbox, liquid for radiators, windshield washer liquid and the like.
  • the present invention can be used at the inside of mechanical repair workshops, in assistance centres and motor-vehicle production lines.
  • the fluid is sent to the delivery stations through one or more pumps carrying out transfer of same from the tank to the distribution network and then to the delivery station.
  • Each delivery station is provided with a dispensing device for each type of fluid and is placed in close proximity to the work station of each technician.
  • the pump keeps the fluid at the inside of the distribution network under pressure, so that as soon as a dispensing device is operated the workshop fluid is promptly delivered.
  • the escaped fluid if it is inflammable, can catch fire, or the liquid can be absorbed by the ground and pollute the surrounding environment, or it can also release toxic volatile substances.
  • the technical task of the present invention is to make available a plant for fluid distribution in workshop which is capable of substantially obviating the mentioned drawbacks.
  • a plant for fluid distribution in a workshop in accordance with the invention has been generally identified by reference numeral 1.
  • workshop fluids are oil for motors, oil for braking systems, oil for differential gears, oil for gearbox, liquid for radiators, windshield washer liquid and the like.
  • Plant 1 comprises at least one storage tank 2 for a workshop fluid, at least one fluid delivery station 3, a distribution network 4 extending between the tank 2 and the delivery station 3 and a pump 5 in fluid communication with tank 2 to draw liquid therefrom and admit it into the distribution network 4.
  • Advantageously pump 5 is associated with a control system 13 adapted to manage switching on and off of said pump 5.
  • Tank 2 can be a drum of a capacity of about 200 litres (in case of plants of small sizes), or a reservoir of a capacity of about 1000 litres (in case of plants of medium-big sizes).
  • the invention at all events can advantageously be used for plants provided with tanks of any capacity.
  • tank 2 is installed on suitable supports (not shown) and possibly underground.
  • tank 2 is a double-wall tank to reduce the likelihood of accidental fluid escape from the tank.
  • tank 2 comprises a level meter 25 to stop suction by pump 5, through the control system 13 for example, should tank 2 be completely empty, thus avoiding introduction of air bubbles into the distribution network 4.
  • plant 1 comprises a plurality of tanks 2, each of them containing a different type of workshop fluid.
  • Each tank 2 is in fluid communication with a dedicated distribution network 4 (as diagrammatically shown in Fig. 1 ).
  • each distribution network 4 is not in fluid communication with the others.
  • Each distribution network 4 comprises a main duct 6 and a plurality of branching-off ducts 7 connected, mutually in parallel, to the main duct 6.
  • the main duct 6 consists of rigid steel pipes fastened to the wall of the room wherein plant 1 is to be housed.
  • the main duct 6 consists of flexible hoses laid under the floor or at the inside of wall raceways.
  • the branching-off ducts 7 are adapted to feed the delivery stations 3 by connecting them to the main duct 6.
  • the branching-off ducts 7 comprise a flexible end portion 8, so that the branching-off ducts 7 can be extended or shortened depending on requirements, i.e. depending on the position at which the workshop fluid is to be delivered.
  • the flexible portion 8 (diagrammatically shown in Fig. 1 ) is rolled in a mechanical coiler 23 for flexible hoses.
  • Each delivery station 3 is preferably located at a distal position relative to tanks 2; in particular, each delivery station 3 is placed close to a work area (not shown) where the vehicle remains during the production, maintenance, repair operations.
  • Each delivery station 3 comprises one dispensing gun 9 connected to the distribution network 4.
  • the dispensing gun 9 is connected to the flexible end portion 8 of the branching-off duct 7, in such a manner that the latter, by the dispensing gun 9, can directly reach the vehicle tank on which the workshop fluid is to be used.
  • Each dispensing gun 9 comprises a handgrip and a switching-on lever for fluid delivery.
  • each dispensing gun 9 further comprises a lock button to stop the dispensing gun to the delivery position to enable delivery of fluid without requiring the gun being gripped, and a spout provided with a dripping-preventing check valve to avoid the workshop fluid from dripping when delivery is over.
  • each dispensing gun 9 is equipped with a litre-counter device 21.
  • the litre-counter device 21 comprises a hollow body passed through by the flow of the workshop fluid to be dispensed which drives a pair of idler gears in rotation, the number of revolutions of which is detected by an encoder.
  • the litre-counter device 21 can also be positioned upstream of the dispensing gun 9, and in particular between the branching-off duct 7 and the flexible portion 8.
  • a metering cock 22 can be provided which is equipped with a leverage for activation and adjustment, to enable an operator to fill a graduated decanter by which the fluid is poured off into the tank of the vehicle on which the fluid is used.
  • each delivery station 3 has an operating end for delivery of the workshop fluid.
  • the dispensing gun 9 and metering cock 22 are examples of this operating end.
  • pump 5 one for each tank 2, is a pneumatic pump.
  • each pump 5 is a single-acting or double-acting piston pump.
  • the piston pump 5 (not shown in detail) comprises a propelling plunger which is moved with a reciprocating motion within the first cylinder.
  • the propelling plunger is driven by a compressed-air source of constant pressure.
  • the propelling plunger is mechanically connected and drives a piston that is moved with a reciprocating motion within a second cylinder.
  • the cylinder is provided with a suction duct, in fluid communication with tank 2, and with a delivery duct, in fluid communication with the distribution network 4 and therefore with the delivery stations 3 by means of the main duct 6 and the branching-off ducts 7.
  • the propelling plunger drives the piston with a reciprocating motion, which piston draws the fluid from the suction duct and feeds it under pressure to the delivery duct.
  • a low pressure in the delivery duct determined by delivery of fluid from a delivery station 3, operates pump 5, while a high pressure in the delivery duct, produced by non-use of the delivery stations 3, stops pump 5.
  • pump 5 is an electric pump.
  • This electric pump can be of the fixed-displacement type or of the variable-displacement type.
  • pump 5 is able to substantially keep the flow rate of the delivered fluid constant, and therefore generates the necessary pressure to keep the nominal flow rate.
  • pressure generated by the electric pump 5 has a tendency to increase in an uncontrolled manner.
  • a first pressure switch be calibrated to a first threshold pressure Pmax, and the control system 13 of pump 5 switches the pump off when this limit value is reached.
  • a second pressure switch is set to a second threshold pressure Pmin enabling restarting of pump 5 when, following delivery at one or more delivery stations 3, pressure in the fluid-operated circuit falls under the predetermined limit value.
  • the control system 13 of pump 5 can therefore have a first input connected to the first pressure switch, and a second input connected to the second pressure switch, operating a remote control switch.
  • Signals received on the first and second inputs will be respectively used as switching-off and switching-on commands of pump 5, that will be therefore interlocked with said remote control switch.
  • the remote control switch carries out switching on/off of pump 5.
  • auxiliary contact which is representative of the activation state of pump 5 can be obtained from the remote control switch; use of this auxiliary contact will be explained in the following.
  • pump 5 can be an electric variable-displacement pump, in particular provided with a pressure-driven system for automatic adjustment of the flow rate.
  • pump 5 can be a vane pump comprising a collector ring shiftable between two positions: in a first position the ring is substantially concentric with the vane rotor of the pump (zero-flow rate condition), while in a second position the collector is tangent to the rotor (maximum-flow rate condition).
  • the collector displacement is governed by a spring tending to push the collector itself to the second position, which spring is countered by the generated delivery pressure tending to push the ring to the first position. If pressure in the fluid-operated circuit is low or zero, the spring thrust prevails and the pump generates the maximum flow rate.
  • the maximum pressure required for reducing the pump flow rate to zero substantially depends on the force of said compensation spring, on the preloading of which it is possible to operate in order to calibrate the system.
  • variable-displacement pump switching on/off of the electric motor is not required in order to keep the plant to a given pressure range; in fact, if the variable-displacement pump is maintained always switched on, the flow rate goes to zero in an automatic manner in the absence of active user bases.
  • the pressure drop causes the force generated by the compensation spring to prevail so that the collector ring is brought back to the tangent position and, as a result, there is an increase in the generated pressure until the system reaches a new balance condition.
  • plant 1 comprises first detecting means 10 (diagrammatically shown in Fig. 1 ) acting on each pump 5 and adapted to generate at least one signal SA representative of the activation state of pump 5 ( Fig. 2 ).
  • the first detecting means 10 is suitable to determine whether pump 5 is active, i.e. whether pump 5 is transferring fluid from tank 2 to the distribution network 4.
  • the first detecting means 10 preferably in the case of a pneumatic piston pump 5, can consist of a reed sensor (not shown in detail) acting on the propelling plunger or piston of pump 5 to detect the plunger or piston movement.
  • the reed sensor can be a (normally open) reed switch that closes in the presence of a magnetic field generated by the propelling plunger or piston stroke, closing a circuit adapted to generate said activation signal SA.
  • the reed sensor can comprise a magnetic portion (a permanent magnet, for example) and a sensitive portion (provided with one or more reeds of metal material, for example).
  • the magnetic portion is substantially integral with the propelling plunger or the piston, while the sensitive portion is substantially integral with the pump body and/or the tank.
  • the magnetic portion is provided to be substantially integral with the pump body and/or the tank, while the sensitive portion can be substantially integral with the propelling plunger or the piston.
  • said activation signal SA is advantageously generated.
  • the first detecting means 10 preferably when pump 5 is an electric fixed-displacement pump, can comprise a connection to said pump 5, to detect a switched on/off state of same.
  • the first detecting means 10 can comprise a connection to a remote control switch, such as the one briefly described above, acting on pump 5 to selectively supply the same with electric power.
  • the first detecting means 10, preferably if pump 5 is an electric variable-displacement pump, can comprise a current sensor, in particular of the Hall-effect type, to determine the current absorbed by the pump motor and, depending on this absorption, determine the activation condition of pump 5.
  • the first detecting means 10 can comprise a vacuostat device associated with pump 5 to detect a vacuum of same on sucking.
  • Plant 1 further comprises second detecting means 11 (diagrammatically shown in Fig. 1 ) adapted to generate a signal SE representative of the activation state of at least one delivery station 3. This activation state can be directly or indirectly connected to the fluid delivery at the delivery station 3.
  • the second detecting means 11 can comprise a sensor associated with the above mentioned coiler 23 to roll the flexible portion 8 of the branching-off duct 7 of the delivery station 3.
  • this sensor is able to detect an operating dispensing condition or a rest condition of said flexible portion 8.
  • the flexible portion 8 in the rest condition the flexible portion 8 is substantially fully rolled-up around its coiler 23, while in the operating dispensing condition the flexible portion 8 is at least partly and preferably fully unrolled.
  • the second detecting means 11 can for instance comprise a sensor of the reed type, suitably associated with coiler 23 to detect a rotation of same.
  • the second detecting means 11 can also comprise a microswitch contact associated with coiler 23, to detect a rotation of same and/or to detect when coiler 23 is at an end-of-stroke position (a fully rolled condition or a fully unrolled condition).
  • the second detecting means 11 can comprise a sensor suitable to detect whether an operating end of the delivery station 3 is at an operating dispensing position or at a rest condition.
  • This operating end preferably consists of said dispensing gun 9.
  • the dispensing gun 9 is in a rest condition when it is for example positioned in a drop-collecting housing, while it is in the operating condition when pulled out of said housing.
  • the second detecting means 11 can then consist of a contact sensor (e.g. a microswitch) suitably mounted on said housing in order to determine the presence or not of the dispensing gun 9.
  • a contact sensor e.g. a microswitch
  • the second detecting means 11 acts on each dispensing gun 9 and is adapted to determine operation of same so as to generate the SE signal representative of the fluid delivery.
  • the second detecting means 11 comprises a flowmeter (not shown) detecting passage of fluid through the dispensing gun 9.
  • this flowmeter is coincident with the litre-counter device of the above described dispensing gun 9.
  • the second detecting means 11 comprises a device for detecting operation of the activation lever of the dispensing gun 9.
  • the second detecting means 11 can be applied to the activation and adjustment leverage 22a of the metering cock 22 possibly being part of the delivery station 3, for the purpose of generating said signal SE.
  • the second detecting means 11 can comprise a connection to a user interface 14 to be better described in the following.
  • Plant 1 comprises a management unit 12 (diagrammatically shown in Fig. 1 ) adapted to receive and process signals SA, SE generated by the first detecting means 10 and the second detecting means 11 in order to generate an alarm signal SW, should pump 5 be active and the delivery unit 3 be switched off.
  • a management unit 12 (diagrammatically shown in Fig. 1 ) adapted to receive and process signals SA, SE generated by the first detecting means 10 and the second detecting means 11 in order to generate an alarm signal SW, should pump 5 be active and the delivery unit 3 be switched off.
  • the alarm signal SW is generated should pump 5 be active and should therefore admit fluid into the distribution network 4 without any delivery station 3 being actually dispensing fluid.
  • pump 5 admits fluid into the distribution line 4 when pressure in the delivery duct is low. This situation occurs both when the delivery station 3 is dispensing fluid, and when in the distribution network 4 there is a leak from which the fluid escapes.
  • the alarm signal SW generated by the management unit 12 is adapted to switch pump 5 off preferably stopping feeding of same.
  • This feeding interruption advantageously takes place by means of said control system 13 of pump 5.
  • the alarm signal SW causes an interruption in the pneumatic feeding to pump 5.
  • the alarm signal SW causes an interruption in the electric feeding to pump 5.
  • a solenoid valve (not shown) interlocked with the alarm signal WS can be active on the delivery duct of pump 5, in such a manner that activation of same closes the delivery duct, immediately stopping pump 5.
  • the alarm signal SW therefore ultimately aims at inhibiting admission of fluid into the distribution network 4.
  • the alarm signal SW generated by the management unit 12 is able to generate an acoustic/visual indication concerning the fact that an undesired escape of workshop fluid is occurring.
  • This acoustic/visual indication can be carried out from an illuminated display lamp and an acoustic siren (both not shown).
  • the fact that the alarm signal SW either causes switching-off of pump 5, or merely supplies an acoustic/visual signal to the operator, can depend on the frequency with which signal SA is received by the management unit 12.
  • signal SA is transmitted to the management unit 12 in a substantially continuous manner or at all events at a frequency greater than a predetermined threshold, it means that pump 5 is substantially always active (or in any case is switched on very frequently) and therefore is feeding a leak of very important amount. In this case therefore the alarm signal SW will directly switch pump 5 off.
  • signal SA is transmitted to the management unit 12 less frequently, i.e. at a lower frequency than said predetermined threshold, it means that there is a leak of less amount (there is a dripping connection or a faulty dispensing gun, for example) and it is therefore sufficient to provide an acoustic/visual signal to the operator, without switching pump 5 off.
  • the delivery station 3 comprises a user interface 4.
  • the user interface 14 is adapted to generate an enabling signal SO of the delivery station 3 on identification of an operator.
  • This signal SO is transmitted to a solenoid valve 24 interposed between the branching-off duct 7 and the flexible portion 8 that on receipt thereof enables the delivery station 3.
  • a non-reception of the enabling signal SO makes the delivery stations inactive. In this way only a qualified and identified operator can be enabled to use of plant 1.
  • the enabling signal SO can be also sent to the management unit 12, to which the user interface 14 is preferably connected.
  • the enabling signal SO can therefore constitute said signal SE representative of the activation state of the delivery station 3.
  • the management unit 12 can use the enabling signal SO, in combination with or in place of the above mentioned signal SE, in order to decide whether the alarm signal SW is to be generated or not.
  • the second detecting means 11 can comprise a connection with said user interface 14.
  • plant 1 ( Fig. 2 ) comprises respective transmitters 15a connected to the second detecting means 11, and at least one respective transmitter 15b connected to the first connecting means 10.
  • Plant 1 further comprises at least one first and one second receiver 16a, 16b connected to the management unit 12.
  • the management unit 12 further comprises at least one transmitter 17 to transmit the alarm signal SW to pump 5.
  • Pump 5 is associated with a receiver 18 to receive the transmitted alarm signal SW and be switched on.
  • the alarm signal SW can be provided to pump 5 through said control system 13.
  • Signal SE representative of the activation state of each delivery pump 3, is transmitted by the respective transmitter 15a and received by the first receiver 16a.
  • Signal SA representative of the activation state of pump 5
  • transmitter 15b is transmitted by transmitter 15b and is received by the second receiver 16b.
  • one or more of said transmitters/receivers communicate via wireless technology.
  • At least transmitters 15a associated with the second detecting means 11 and the first receiver 16a associated with the management unit 12 mutually communicate via wireless technology.
  • Connection between the management unit 12 and pump 5 and in particular the control system 13, can also be of the wired type.
  • the user interface 14 too can communicate with the management unit 12 either through wireless signals or through a wired connection and comprises a respective transmitter 19 communicating with a receiver 20 of the management unit 12.
  • Receivers 16a, 20 of the management unit 12 can be integrated into a single receiving device.
  • the invention achieves the intended purposes.
  • the alarm signal SW is generated when pump 5 is active and therefore admits fluid into the distribution network 4 without any delivery station 3 being really in an activated condition. This means that the alarm signal SW is generated when fluid escape is taking place in the distribution network 4.
  • This alarm signal enables the operators to be warned about the occurrence of fluid escape and/or to immediately stop the pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP08425492A 2008-07-21 2008-07-21 Installation pour la distribution de fluide dans un atelier Not-in-force EP2154104B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08425492A EP2154104B1 (fr) 2008-07-21 2008-07-21 Installation pour la distribution de fluide dans un atelier
AT08425492T ATE535491T1 (de) 2008-07-21 2008-07-21 Anlage zur flüssigkeitsverteilung in einer werkstatt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08425492A EP2154104B1 (fr) 2008-07-21 2008-07-21 Installation pour la distribution de fluide dans un atelier

Publications (2)

Publication Number Publication Date
EP2154104A1 true EP2154104A1 (fr) 2010-02-17
EP2154104B1 EP2154104B1 (fr) 2011-11-30

Family

ID=40011298

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08425492A Not-in-force EP2154104B1 (fr) 2008-07-21 2008-07-21 Installation pour la distribution de fluide dans un atelier

Country Status (2)

Country Link
EP (1) EP2154104B1 (fr)
AT (1) ATE535491T1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107746037B (zh) * 2017-10-10 2019-05-21 安徽江淮汽车集团股份有限公司 一种变速箱加油控制系统及其控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542836A (en) * 1982-07-01 1985-09-24 Castrol Limited Liquid dispensing system
US20020188382A1 (en) * 2001-06-08 2002-12-12 Sherwood Randall Lee Method and apparatus for monitoring and controlling pump and valve system operations
FR2828026A1 (fr) * 2001-07-26 2003-01-31 Mostefa Charef Unite electrique de controle pour installation de distribution de fluide
US6924733B1 (en) * 2003-08-21 2005-08-02 Mctier Supply Company Hose separation transmitter system and methods
EP1880975A1 (fr) * 2006-07-17 2008-01-23 Filcar S.p.A. Installation de distribution de fluide pour un atelier

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542836A (en) * 1982-07-01 1985-09-24 Castrol Limited Liquid dispensing system
US20020188382A1 (en) * 2001-06-08 2002-12-12 Sherwood Randall Lee Method and apparatus for monitoring and controlling pump and valve system operations
FR2828026A1 (fr) * 2001-07-26 2003-01-31 Mostefa Charef Unite electrique de controle pour installation de distribution de fluide
US6924733B1 (en) * 2003-08-21 2005-08-02 Mctier Supply Company Hose separation transmitter system and methods
EP1880975A1 (fr) * 2006-07-17 2008-01-23 Filcar S.p.A. Installation de distribution de fluide pour un atelier

Also Published As

Publication number Publication date
ATE535491T1 (de) 2011-12-15
EP2154104B1 (fr) 2011-11-30

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