WO2002066873A1 - Distributeur 2/2 a siege et pilote - Google Patents

Distributeur 2/2 a siege et pilote Download PDF

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Publication number
WO2002066873A1
WO2002066873A1 PCT/EP2002/000681 EP0200681W WO02066873A1 WO 2002066873 A1 WO2002066873 A1 WO 2002066873A1 EP 0200681 W EP0200681 W EP 0200681W WO 02066873 A1 WO02066873 A1 WO 02066873A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pilot
piston
connection
main valve
Prior art date
Application number
PCT/EP2002/000681
Other languages
German (de)
English (en)
Inventor
Horst Rott
Original Assignee
Bosch Rexroth Ag
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 Bosch Rexroth Ag filed Critical Bosch Rexroth Ag
Publication of WO2002066873A1 publication Critical patent/WO2002066873A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
    • F16K31/406—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor acting on a piston
    • 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
    • F15B2013/002—Modular valves, i.e. consisting of an assembly of interchangeable components
    • F15B2013/004—Cartridge valves

Definitions

  • the invention relates to a pilot operated 2/2 way seat valve, which is designed in particular as a valve cartridge and which has the features from the preamble of claim 1.
  • a valve of this type known from EP 0 503 188 A2 has a valve housing with a receiving bore formed in a sleeve-shaped housing section and a main valve piston which is axially movable in the receiving bore, a flow cross section of which has a flow cross section between a first valve connection opening axially into the receiving bore and a radial one is openable and controllable in the receiving bore opening second valve connection.
  • the main valve piston can be acted upon in the opening direction by the pressure in the first valve connection and in the closing direction by the pressure in a rear control chamber.
  • the control chamber is axially delimited opposite the main valve piston by a housing transverse wall and can be connected to the one valve connection in a throttled manner via a first flow path leading through the main valve piston.
  • a pilot valve can be switched between an open position in which a second flow path leading from the control chamber to the other valve connection and with a path section through the main valve piston is open, and a closed position in which the second flow path is closed.
  • the second flow path also leads through the sleeve-shaped housing section with the receiving bore, so that complex drilling is necessary and the design of the housing is subject to restrictions.
  • the object of the invention is to further develop a pilot operated 2/2 way seat valve with the features from the preamble of patent claim 1. wrap that it can be manufactured with reduced effort and the housing can be very thin-walled.
  • the axis of the connecting tube coincides with the axis of the main valve piston, so that the connecting tube is coaxial with the main valve piston. Frictional forces which act on the main valve piston due to the connecting pipe then act largely symmetrically on the main valve piston and therefore cannot lead to tilting of the main valve piston.
  • the connecting pipe is inserted with a first pipe section in the transverse wall of the housing and with a second pipe section in the main valve piston, the outer diameter of the first pipe section being larger than the outer diameter of the second pipe section.
  • an engagement surface is present on the connecting pipe, at which the pressure prevailing in the control chamber can act on the connecting pipe in the direction of the transverse housing wall and hold it on the transverse housing wall.
  • a compression spring housed in the control chamber which loads the main valve piston in the closing direction, is supported by the connecting tube on the housing and thus holds it in addition to the pressure in the control room on the housing transverse wall.
  • the connecting tube Due to the force exerted by the pressure and / or by the compression spring on the connecting tube, the connecting tube maintains its position with respect to the housing, even if it is not inserted firmly but with a certain radial play into the transverse wall of the housing.
  • the radial play enables the connection pipe to be aligned by the main valve piston.
  • pilot-operated 2/2-way seat valves are generally desired with basically the same structure.
  • neither the first valve connection to the second valve connection nor the second valve connection to the first valve connection can flow through the valve, ie it blocks in both flow directions.
  • a flow from the first valve connection to the second valve connection is possible when the pilot valve is closed, but not in the opposite direction.
  • the valve can only flow through from the second valve connection to the first valve connection.
  • the pressure reduction in the control chamber required to open the main piston and the displacement of control oil from the control chamber must take place in each case via the second flow path from the control chamber via the pilot valve and the connecting pipe to the respectively lower pressure valve connection.
  • the second flow path branches out only after the connecting pipe inside the main valve piston into a path branch leading to the first valve connection and into a path branch leading to the second valve connection, with a check valve element opening towards the respective valve connection being arranged in each path branch.
  • the second flow path depending on the variant, must lead either to the first valve connection or to the second valve connection.
  • a main valve piston with a Branch of the second flow path can be used after the connecting pipe.
  • a check valve element is then located in each path branch.
  • the first flow path has a first axial blind bore, which starts from the end face of the main valve piston facing the first valve connection, and a second axial blind bore offset from the first blind bore, which starts from the end face of the main valve piston facing the control chamber.
  • Both axial blind bores are connected to one another by a third blind bore which is open to the second valve connection and runs transversely.
  • a non-return valve element blocking this valve connection is located between the second blind bore and at least one valve connection.
  • the at least one check valve element is preferably inserted into the third blind bore, a stop projecting into the third blind bore, which holds the check valve element on one side of the second blind bore.
  • a throttle is located in the second blind bore.
  • variants 2 and 3 can be constructed identically to one another.
  • a throttle in itself is no longer necessary in the second blind bore.
  • a throttle can also be located in variant 2 in the second blind bore. Preferably, this fulfills the function of a stop for the at least one check valve element in the third blind bore in all three variants.
  • main valve pistons can be used for the three variants, which differ from each other only in the elements inserted into the third blind bore.
  • the first variant there are two check valve elements in the third blind hole.
  • the third sack in which the third sack is used.
  • the seat for the other check valve element can be obtained directly by reducing the diameter of the third blind hole.
  • the one check element between the second bag is missing.
  • FIG. 5 shows a circuit diagram of the first exemplary embodiment
  • FIG. 6 shows the main valve piston of the second exemplary embodiment, which blocks only in one flow direction in the closed position of the pilot valve, in a section corresponding to the section according to FIG. 4,
  • FIG. 7 shows a circuit diagram of the second exemplary embodiment
  • FIG. 8 shows the main valve piston of the third exemplary embodiment, which also locks in the closed position of the pilot valve only in one flow direction, but opposite to the flow direction compared to the second exemplary embodiment, in a section corresponding to the section according to FIG. 4 and
  • Figure 9 is a circuit diagram of the third embodiment.
  • the exemplary embodiments shown differ only in how different elements are inserted in the main valve piston. Otherwise, all are the same, so that with the exception of the respective main valve piston, reference can be made to FIG. 1 for all exemplary embodiments. Thereafter, the exemplary embodiments shown are provided as so-called valve cartridges for being inserted into a corresponding receiving bore 10 of a valve plate 11. A channel 12 opens axially into the receiving bore 10 and a channel 13 radially. The pressure medium flow between the two channels 12 and 13 can be controlled with the valve inserted into the receiving bore 10.
  • the second essential part of the valve housing 14 is a screw plug 25 which is screwed into the receiving bore 10 of the valve plate 11 and which receives the housing sleeve 15 in a recess 26 to a certain extent, that is to say overlaps the exterior to a certain extent.
  • the screw plug 25 is screwed in so far that the housing sleeve 15 is firmly clamped between the bottom 27 of the screw plug and the bottom of the receiving bore 10 in the valve plate 11.
  • a locking wire 28 engages in an outer ring groove of the housing sleeve 15 and in an inner ring groove of the locking screw 25.
  • the main valve piston 17 borders on a rear control chamber 35 which is delimited opposite the main valve piston 17 by the locking screw 25 and radially by the housing sleeve 15.
  • the main valve piston 17 is acted upon by the pressure prevailing in this control chamber in the direction of closing the flow cross section at the seat edge 20.
  • a compression spring 36 also acts on the main valve piston 17 in the closing direction. space 35 housed and clamped between the main valve piston and a still to be described connecting tube 40 of the screw 25.
  • the control chamber 35 is throttled on the one hand via a first flow path to the valve connection 19 or 21, in which the higher pressure is present, and on the other hand connectable to the valve connection via a second flow path, which can be opened and closed by a pilot valve 50, in which is at the lower pressure.
  • the pilot valve comprises an electromagnet 51 with a magnetic armature 52 and is designed as a screw-in cartridge which is screwed into a central receiving bore 53 of the screw plug 25 which is open to the outside.
  • the pilot valve is a 2/2-way seat valve with a pressure-balanced valve piston 54 which is suspended in the magnet armature 52.
  • a compression spring, not shown, on the side of the magnet armature 52 opposite the valve piston 54 acts against the magnetic force and, via the magnet armature, tries to place the valve piston 54 onto a valve seat 56 with a cone 55.
  • the valve piston 54 passes through the valve seat 56 with a section that has a reduced diameter compared to the seat diameter before it is guided at a distance from the valve seat 56 with a guide section, the diameter of which is equal to the seat diameter, in a blind bore 57 of the valve cartridge 58 ,
  • the free space around the portion of the valve piston 54 with the reduced diameter is provided via an oblique bore 59 in the valve cartridge 58 with an annular space 60 formed between the screw plug 25 and the valve cartridge 58 and via a bore 61 opening into this annular space in the screw plug 25 connected to the control room 35.
  • the bore 25 extends obliquely outwards, so that it opens into the control chamber 35 via an inner lead-in slope of the housing sleeve 15 and is therefore not completely covered even when the main valve piston 17 abuts the bottom 27 of the screw plug 25.
  • the bore 25 can also run in the axial direction.
  • the armature chamber 66 of the pilot valve 50 is connected via a bore 62 of the valve cartridge 58 to a free space 63 located between the end face of the valve cartridge 58 and the bottom of the receiving bore 53 of the screw plug 25. This in turn is connected via a bore 64 running in the axis of the valve in the screw plug 25 to a circular cylindrical recess 65 of the screw plug 25 which is open to the control chamber 35.
  • the connecting pipe 40 is inserted with a first pipe section 71 of larger diameter tightly into the recess 65 of the screw plug 25. It crosses the control chamber 35 with a second pipe section 72 of smaller diameter and projects sealingly into a corresponding bore 73 of the main valve piston 17. At the difference between the cross sections of the pipe sections 71 and 72, the connecting pipe 40 is acted upon by the pressure prevailing in the control chamber 35 in the direction of the screw plug 25.
  • the compression spring 36 also acts in this direction on the connecting pipe, so that despite a certain play in the recess 65 it remains securely on the screw plug 25 and only the main valve piston 17 and the connecting pipe 40 move relative to one another. Control oil can pass through the connecting pipe 40 from the bore 64 of the screw plug 25 into the main valve piston 17.
  • a stepped axial bore 74 extends from the bottom of the bore 73 of the main valve piston 17 and opens into the end face 33 of the main valve piston 17.
  • a ball 75 with a relatively large radial play as a check valve element which is held in the bore by an adapter sleeve 76 and which can sit tightly on the step between the two bore sections.
  • the check valve element 75 thus opens to the first valve connection 19.
  • a stepped radial bore 77 in the outer portion with a larger diameter as a further check valve element is a ball 78, which also has a relatively large radial clearance and which sit closely on the step between the two sections of the bore 77 can.
  • the radial bore 77 opens out in any position of the main valve piston 17 axially outside the bores 21 so that the ball 78 cannot be lost.
  • a longitudinal groove in the main valve piston connects the mouth of the bore 77 with the second valve connection 21.
  • the ball 78 opens towards the latter.
  • the three exemplary embodiments shown correspond to one another. They differ only in how the control chamber 35 can be connected to the two valve connections 19 and 21 via a first flow path. In this case, those for this first flow path are in the main valve piston
  • a blind bore 78 extends eccentrically from the end face 33 facing the first valve port 19, which extends into the plane through the axis of the radial bore 77 and perpendicular to the longitudinal axis of the main valve piston 17. In this plane there is a further transverse
  • two balls 89 and 90 serving as check valve elements and a ball seat 91 are inserted into the transverse bore 79.
  • the ball 89 is located between the pin 84 of the nozzle body 82 and the step 80.
  • the ball 90 is located between the pin 84 and the ball seat 91.
  • an annular groove 85 runs around the main valve piston 17, which on the one hand avoids one-sided pressure loading of the main valve piston 17 and on the other hand allows the to connect the two transverse bores to the second valve connection 21 via a single longitudinal notch in the outer surface of the main valve piston 17.
  • the pilot operated 2/2-way seat valves shown can be divided into four operating states.
  • a first operating state the pilot valve is closed and the pressure at the first valve connection 19 is greater than at the second valve connection 21.
  • the pilot valve is also closed and the pressure at the second valve connection 21 is higher than at the first valve connection 19.
  • the pilot valve is open and the pressure at the first valve connection 19 is greater than at the second valve connection 21.
  • the pilot valve is also open and the pressure at the second valve connection 21 is higher than at the first valve connection 19.
  • the same pressure is present in the control chamber 35 in the first operating state as in the first valve connection 19, since the pressure in the first valve connection 19 lifts the ball 89 in the transverse bore 79 from the step 80 and the ball 90 against the Ball seat 91 presses. There is thus a fluidic connection between the first valve connection 19 and the control chamber 35.
  • the control chamber 35 is blocked off by the ball 90 and by the pilot valve 50 for the second valve connection 21.
  • the pilot valve 50 is now opened.
  • Control oil from the control chamber 35 can now via the bores 61 and 59, the flow cross section between the piston 54 and seat 56 of the pilot valve, the bore 62 of the valve cartridge 58, the bore 64, the connecting pipe 40 and the bores 73 and 74 and the check valve element 75 in the main valve piston 17 flows to the first valve port 19.
  • the throttle bore 83 through which control oil can flow from the second valve port 21 into the control chamber 35 only in a throttled manner, the pressure in the control chamber 35 can be reduced to the pressure in the first valve port 19, if one considers the low pressure losses in the second flow path from the control chamber 35 to the first valve port 19.
  • the pressure prevailing in the second valve connection 21 and acting on the annular surface mentioned above on the main valve piston 17 can now lift it off the seat edge 20.
  • the valve opens.
  • control oil flows from the first valve port 19 to the control chamber 35 via the axial bore 78, the ball 89 and the throttle 83.
  • the ball 90 is pressed against the ball seat 91.
  • Control oil flows from the control chamber 35 via the pilot valve 50, the connecting pipe 40 and the transverse bore 77 with the ball 78 to the second valve connection 21. The valve also opens.
  • FIG. 5 The circuit diagram shown in FIG. 5 is thus realized by the exemplary embodiment according to FIGS. 1 to 4.
  • the pilot valve 50 When the pilot valve 50 is closed, neither from the first valve connection 19 to the second valve connection 21 nor in the reverse Flow direction possible. With the pilot valve 50 open, however, pressure medium can flow in both directions.
  • the ball 89 is lifted off the seat 80 and moved to the stop 84. There is now an oil flow from the first valve port 19 via the bore 78, the throttle gap on the ball 89 and the bore 79 to the second valve port 21. Because of the throttling on the ball 89, the pressure remains downstream of the ball and thus also in the control chamber 35 on the Level of the pressure in the second valve connection 35. The pressure in the first valve connection 19 rises so far that it can lift the main valve cone 17 against the pressure prevailing in the control chamber 35 from the seat edge 20 and open the valve.
  • the second exemplary embodiment functions like a check valve which blocks from the second valve connection 21 to the first valve connection 19.
  • the ball seat 91 and the ball 90 are located in the transverse bore 79.
  • no flow through the main valve from the first valve connection 19 to the second valve connection 21 is possible when the pilot valve is closed.
  • the higher pressure in the valve connection 19 in front of the end face 33 of the main valve piston 17 presses the ball 90 onto the valve seat 91, so that no flow between the two valve connections is possible via the bores 78 and 79.
  • the pressure in front of the end face 33 is also present in the control chamber 35 via the bores 78, 79 and 81.
  • the main valve piston 17 therefore remains on the seat edge 20.
  • the higher pressure can act on the annular surface of the main valve piston 17 to lift it off the seat edge 20 and open the valve.
  • the pressure prevailing in the first valve connection 19 is now also present in the control chamber 35.
  • the main valve piston is thus pressure-balanced with respect to the end face 33.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

L'invention concerne un distributeur 2/2 à siège et piloté, notamment de type cartouche. Un distributeur connu de ce type comprend un corps de soupape, un piston de soupape principal qui peut être déplacé axialement dans un alésage de réception du corps de soupape, qui peut commander en ouverture et en fermeture une section d'écoulement entre un premier raccord de soupape s'ouvrant axialement dans l'alésage de réception et un deuxième raccord de soupape s'ouvrant radialement dans l'alésage de réception et qui peut être sollicité dans le sens d'ouverture par la pression dans le premier raccord de soupape. Le piston de soupape principal peut être sollicité dans le sens de fermeture par la pression existant dans une chambre de commande arrière. La chambre de commande est délimitée axialement par rapport au piston de soupape principal par une paroi transversale du corps et peut être raccordée avec étranglement à l'un des raccords de soupape par un premier chemin d'écoulement traversant le piston de soupape principal. Une soupape pilote peut être commutée entre une position ouverte, dans laquelle un deuxième chemin d'écoulement est ouvert, conduisant de la chambre de commande à l'autre raccord de soupape et dont un segment traverse le piston de soupape principal, et une position fermée, dans laquelle le deuxième chemin d'écoulement est fermé. Dans le distributeur 2/2 à siège connu, le deuxième chemin d'écoulement traverse également le segment de corps en forme de douille présentant l'alésage de réception, de sorte qu'un perçage coûteux est nécessaire et que la réalisation du corps de soupape est soumise à des restrictions. L'invention vise à réduire les dépenses et à réaliser un corps de soupape à paroi mince. A cet effet, l'invention prévoit un tube de raccordement situé dans le deuxième chemin d'écoulement, s'étendant entre la paroi transversale du corps et le piston de soupape principal et croisant la chambre de commande arrière.
PCT/EP2002/000681 2001-02-16 2002-01-24 Distributeur 2/2 a siege et pilote WO2002066873A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10406892.1 2001-02-16
DE10106892A DE10106892A1 (de) 2001-02-16 2001-02-16 Vorgesteuertes 2/2-Wege-Sitzventil

Publications (1)

Publication Number Publication Date
WO2002066873A1 true WO2002066873A1 (fr) 2002-08-29

Family

ID=7674038

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/000681 WO2002066873A1 (fr) 2001-02-16 2002-01-24 Distributeur 2/2 a siege et pilote

Country Status (2)

Country Link
DE (1) DE10106892A1 (fr)
WO (1) WO2002066873A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104074995A (zh) * 2013-03-28 2014-10-01 浙江三花股份有限公司 双向电磁阀
CN104074996A (zh) * 2013-03-28 2014-10-01 浙江三花股份有限公司 双向电磁阀

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10323595A1 (de) * 2003-05-16 2004-12-09 Hydac Fluidtechnik Gmbh Ventil
DE102007025889A1 (de) * 2007-06-01 2008-12-11 Amd - Otto Hennlich Technology Gmbh Ventilpatrone zur auswechselbaren Anordnung in einem Ventilblock eines Schildausbaus
DE102014015704A1 (de) * 2014-10-22 2016-04-28 Hydac Fluidtechnik Gmbh Vorgesteuertes Wegeventil

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4779648A (en) * 1985-02-25 1988-10-25 Sloate Harry M Pilot controlled valves
EP0369969A2 (fr) * 1988-11-15 1990-05-23 Valvtech AB Soupape pour fluides sous pression

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072752A (en) * 1991-03-14 1991-12-17 Sterling Hydraulics, Inc. Bidirectional cartridge valve
DE19605557A1 (de) * 1996-02-15 1997-08-21 Rexroth Mannesmann Gmbh Ventilpatrone

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4779648A (en) * 1985-02-25 1988-10-25 Sloate Harry M Pilot controlled valves
EP0369969A2 (fr) * 1988-11-15 1990-05-23 Valvtech AB Soupape pour fluides sous pression

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104074995A (zh) * 2013-03-28 2014-10-01 浙江三花股份有限公司 双向电磁阀
CN104074996A (zh) * 2013-03-28 2014-10-01 浙江三花股份有限公司 双向电磁阀
CN104074995B (zh) * 2013-03-28 2018-01-02 浙江三花制冷集团有限公司 双向电磁阀
CN104074996B (zh) * 2013-03-28 2018-03-23 浙江三花制冷集团有限公司 双向电磁阀

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Publication number Publication date
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