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
  • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
  • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
  • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
  • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
  • F15B13/0422—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks

Definitions

• the subject of the present invention is a device for dispensing pressurized fluid used, for example, to control one or more users of pressurized fluid from a control member, in particular maneuvered by means of a pedal.
• the invention relates to a device for dispensing pressurized fluid installed on board a public works machine.
• the pressurized fluid dispensing devices usually encountered comprise a body which houses at least one pressure reducer and which, facing an upper face, supports a control member capable of modifying the pressure regulated by the pressure reducer, the reducing gear pressure device comprising: - a pusher which extends between a head and a foot, which is slidably mounted at the upper end of the body, reciprocating between a rest position and a depressed position , the head being urged by the control member to allow the control of at least one receiver external to the device, - a distribution channel formed in the body and which is connected at its ends respectively with a main compensation chamber intended to be connected to a low pressure fluid line and a blind auxiliary compensation chamber, the two main chamber and auxiliary tank in communication at least temporarily, - an inlet pipe that opens into the distribution channel, and which is connected to a source of high pressure fluid, - an outlet pipe which opens into the distribution channel and which is intended to to be connected to the receiver to be controlled, - a plunger which is movable in translation inside
• Such pressurized fluid dispensing devices generally make it possible to increase the regulated pressure in the outlet pipe when the pusher is controlled towards its depressed position.
• a known solution is to place the regulation on the opposite side to that desired at the control. In the neutral position, the pusher is then fully pressed and the pressure is maximum. In order to cause the decrease in pressure, it controls the raising of the pusher.
• This device has the disadvantage of not exerting a positive action on the pusher so that it may become stuck in the depressed position.
• the present invention therefore aims to provide a pressurized fluid dispenser device which reduces the load in the outlet pipe when the pusher is actuated from its rest position to its depressed position.
• the device for dispensing pressurized fluid according to the present invention is essentially characterized in that the pusher comprises a central bore that can be raised to the foot of said pusher, in that the head of the plunger is movably mounted inside the pusher.
• the dispensing device implements a single pusher that allows to control a pressure decrease in the outlet pipe by depression of the pusher.
• the floor drawer comprises a central groove whose annular section increases in the direction of the free end of the drawer.
• the slide comprises a central compensation bore which opens at the free end of the slide and which is connected to a transverse bore which opens into the main clearing chamber for at least temporary communication of said two chambers.
• a channel external to the drawer is formed in the body to put in communication at least temporarily the two main and auxiliary chambers.
• the throat of the slide is in permanent connection with the outlet pipe regardless of the axial position of the slide.
• Figure 2 is a cross-sectional view of the device of Figure 1, a pressure being applied and the pusher being in its rest position or not activated.
• Figure 3 is a view similar to that of Figure 2, the pusher being controlled to its depressed position to cause a decrease in pressure in the outlet pipe.
• the device for dispensing fluid under pressure according to the invention as shown in Figures 1 to 3, and generally designated by the reference numeral 1, comprises a body 2 in which is mounted at less a pressure reducer 3 and which supports, facing an upper face 4, a control member (not shown) adapted to modify the pressure regulated by the pressure reducer 3.
• This pressure reducer 3 has, in a known manner in itself, a pusher 5 which extends between a head 6 and a foot 7, and which is slidably mounted at the upper end 4 of the body 2, in a movement back and forth between a rest position as shown in Figures 1 and 2, and a depressed position as shown in Figure 3.
• the head 6 is biased by the control member to allow to control at least one receiving member outside the device (not shown).
• a distribution channel 10 is formed in the body 2 and extends between a first end 11 which opens into a main compensation chamber 15, and a second end 12 which opens into a blind auxiliary compensation chamber 16. known manner, the main clearing house
• the pressure reducer 3 further comprises an outlet pipe 22 which opens into the distribution channel 10, and which is intended to be connected to the hydraulic receiver to be controlled.
• the outlet pipe 22 is connected to the distribution channel 10, between the inlet pipe 21 and the auxiliary compensation chamber 16.
• the pressure reducer 3 has a plunger 25 integral with the displacement of a distribution between a start position and an end position to provide the pressure regulating function.
• the plunger 25 extends between an enlarged head 26 and a connecting foot 27 at which the distribution spool 30 is connected forming a shoulder 28.
• the plunger 25 is movable in translation inside the main compensation chamber 15.
• the dispensing spool 30 has a first end 31 which is integral with the connecting foot 27 of the plunger 25 and a second free end 32 opposite the first end and which is turned towards the auxiliary compensation chamber 16.
• the dispensing spool 30 and the plunger 25 may for example form a single piece.
• a cup 35 is mounted coaxially with the plunger 25 by being in simple support against the foot 7 of the pusher 5.
• a return spring 40 is housed in the main compensation chamber 15 to be interposed between the cup 35 and the bottom 17 of the main compensation chamber 15.
• This return spring is coaxial with the cup and is located outside thereof.
• the pusher 5 is recessed over most of its length and has a central bore 45 which opens at the foot 7 of this pusher.
• the pusher 5 may be a non-recessed piece which is extended by a hollow cylindrical body forming a liner. This hollow body is functionally similar to the hollow pusher over part of its length.
• the foot 7 may then for example be integral with the cup instead of being integral with the pusher, the cup thus extending upwards, in the direction of the pusher.
• the enlarged head 26 of the plunger 25 is movably mounted inside the central bore 45 of the pusher 5 and is urged towards the bottom of this bore by a regulating spring 50.
• This regulating spring 50 is housed inside.
• the bore 45 of the pusher 5 being mounted concentrically to the plunger 25. It is interposed between the underside of the enlarged head 26 of the plunger 25 and the bottom 37 of the cup 35.
• the plunger 25 thus extends to the In the aforementioned variant, the enlarged head 26 is mounted movably inside the hollow body that plays the role of this shirt.
• the distribution spool 30 has on the one hand, an axial central bore 33 which opens at the free end 32 of this drawer to be connected to the auxiliary compensation chamber 16 and secondly, a transverse bore 34 which opens into the main compensation chamber 15 and which is connected to the axial bore 33.
• the central bore 33 may be provided with a restriction 42 which opens into the auxiliary chamber 16.
• the axial bores 33 and 34 transverse allow to put into permanent communication the two main compensation chamber 15 and auxiliary 16.
• this permanent communication is obtained by replacing the two bores 33 and 34 by a channel 43 external to the drawer, being formed in the body 2 of the device 1. This channel 43 is shown in Figures 1 to 3 in dashed lines.
• the compensation slide 30 has, in its central part, a groove 37 whose annular section increases in the direction of the free end 32 of the slide 30.
• This central groove 37 defines on the surface exterior of the spool 30 an upstream annular shoulder 38 and a downstream annular shoulder 39 which extend substantially transversely to the longitudinal axis of the spool.
• the upstream shoulder surface 38 is smaller than the area of the downstream shoulder 39 so that the increase of the pressure in the inlet pipe 21 causes the slide 30 to move towards the auxiliary compensation chamber 16.
• the central groove 37 is, regardless of the position of the distribution valve 30 inside the distribution channel 10, in permanent connection with the outlet pipe 22.
• the drawer 30 is then in a position of equilibrium in which it is no longer in abutment against the bottom of the cup, the shoulder 28 of this drawer having been removed from this bottom.
• a so-called high pressure is then exerted in the outlet pipe 22.
• the pressurized fluid dispenser according to the present invention thus makes it possible to control in the outlet line 22 the fluid pressure from a high value when the pusher is not depressed to a lower position when this pusher is pressed inside the compensation chamber.
• the pressure regulation will thus be considered as inverted.
• the regulating spring gives the spool valve a set point from bottom to top.

Landscapes

• Engineering & Computer Science (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid-Driven Valves (AREA)
• Devices For Dispensing Beverages (AREA)
• Nozzles (AREA)
• Coating Apparatus (AREA)
• Multiple-Way Valves (AREA)
• Loading And Unloading Of Fuel Tanks Or Ships (AREA)
• Lift Valve (AREA)
• Fluid-Pressure Circuits (AREA)
• Reciprocating Pumps (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=33548266

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (3)

• 2003
  • 2003-07-18 FR FR0308825A patent/FR2857705B1/fr not_active Expired - Fee Related
• 2004
  • 2004-06-10 EP EP04767315A patent/EP1646791B1/de not_active Expired - Lifetime
  • 2004-06-10 PL PL04767315T patent/PL1646791T3/pl unknown
  • 2004-06-10 AT AT04767315T patent/ATE344884T1/de not_active IP Right Cessation
  • 2004-06-10 WO PCT/FR2004/001450 patent/WO2005017365A1/fr active IP Right Grant
  • 2004-06-10 DE DE602004003148T patent/DE602004003148T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events