EP2481933A2 - Ventileinrichtung - Google Patents

Ventileinrichtung Download PDF

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Publication number
EP2481933A2
EP2481933A2 EP12152616A EP12152616A EP2481933A2 EP 2481933 A2 EP2481933 A2 EP 2481933A2 EP 12152616 A EP12152616 A EP 12152616A EP 12152616 A EP12152616 A EP 12152616A EP 2481933 A2 EP2481933 A2 EP 2481933A2
Authority
EP
European Patent Office
Prior art keywords
valve
hydraulic
valves
valve arrangement
channel
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.)
Withdrawn
Application number
EP12152616A
Other languages
English (en)
French (fr)
Other versions
EP2481933A3 (de
Inventor
Bengt Olsson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2481933A2 publication Critical patent/EP2481933A2/de
Publication of EP2481933A3 publication Critical patent/EP2481933A3/de
Withdrawn legal-status Critical Current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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/30575—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve in a Wheatstone Bridge arrangement (also half bridges)
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7053—Double-acting output members

Definitions

  • the present invention relates to a valve arrangement for the control of hydraulic components such as power cylinders and motors, especially at working vehicles for forestry, agriculture and constructional works.
  • hydraulic components such as power cylinders and motors
  • the operator is not able to be placed in the immediate proximity to the core components of the hydraulics, whereby a need for remote control occurs.
  • This is normally solved in that the operator actuates a system of valves for the hydraulic components, via a distance bridging manoeuvring device, which e.g. may comprise electrical switches and longer or shorter electric cables, by means of which electro magnets are activated, which magnets actuates the change-over movements of the valves.
  • the valves are normally mounted at a metal block which comprises sophisticated channel systems. The blocks are comparatively difficult to manufacture with a reasonable reliability of service.
  • This known solution is complex and expensive, especially when large block valve units are demanded in small numbers. This technical field is also illustrated in the patent application with No: SE 0302743 .
  • a purpose of the present invention is to provide en enhanced valve arrangement for the control of hydraulic components. It is another purpose to provide a valve arrangement which solves the above described problems and which constitutes a simple, flexible and economical arrangement of valves for the control of hydraulic components and which in addition is very functional and reliable in service.
  • valve arrangement of the kind defined in the preamble of claim 1 and which exhibits the special technical features indicated in the characterizing portion of the claim.
  • the valve arrangement according to the invention is intended for controlling hydraulic components such as power cylinders and motors.
  • the valve arrangement comprises a directional valve and a first and a second channel, which channels are connected to the directional valve. Said directional valve is arranged to control the flow direction of a fluid in said channels.
  • the valve arrangement further comprises a number of first and second hydraulic valves arranged in pairs. The first hydraulic valve in each pair is connected to the first channel and arranged to be connected to a first port of a hydraulic component.
  • the second hydraulic valve in each pair is connected to the second channel and arranged to be connected to a second port of the corresponding hydraulic component.
  • Said first and second hydraulic valves are composed of dual port shut off valves of the seat type.
  • At least one hydraulic valve in each pair is arranged sealing in both fluid flow directions.
  • the valve arrangement also comprises a manoeuvring unit for activation of the directional valve and of the first and second hydraulic valves.
  • the invention provides a valve arrangement which is very simple in construction and reliable in service.
  • the valve arrangement further exhibits very high flexibility and versatility. Grace to that any desired number of pairs of hydraulic valves readily may be connected to the first and second channel, it is very easy to adapt the valve arrangement to different applications where the number and type of the hydraulic components to be controlled varies largely.
  • a number of unitary valves of very simple type is used, viz. dual port shut off valves of the seat type, which may be manufactured in large series at a reasonable cost.
  • These dual port shut off valves have only two modes, either open for through flow of fluid or closed for through flow of fluid, at least in one of both flow directions. This in contrast to larger multi port valves, which are always designed as sliding valves.
  • Seat valves may, in contrast to sliding valves, achieve complete sealing against fluid through flow and often provide a better functionality than sliding valves.
  • the advantageous sealing of the dual port shut off valves according to the invention results inter alia in a god load supporting capability of the hydraulic components which are controlled by means of said valves.
  • Fig. 1 illustrates a valve arrangement at which the hydraulic valves characterizing the invention are dual port shut off valves 20, 30 and 40 which, in this particular case, are of a certain type of seat valve which seals completely against fluid through flow in both directions. They are arranged to be changed over by means of electro magnets and they are completely closed by a spring force at an electrically inactivated mode.
  • Fig. 1 further illustrates a directional valve 10 comprising a double 3-port valve, often referred to as a 6/2 valve and an hydraulic component in the form of a power cylinder 50 which is controlled by means of the valve arrangement.
  • Fluid is supplied to this directional valve at port 12a and exits the directional valve at port 12b, for being returned to the pressure pump 2 which provides said supply. Normally, this is carried out through a tank 1 and a filter. If said pump is of the non-load-sensing type, then a relief valve is advantageously inserted, which is kept open for fluid through flow by spring force at electrical inactivated mode, but which is closed by means of electrical activation when any component is to be driven. If the pump 2 is of the load sensing type, then a valve 4 which is closed in the electrical inactivated mode is inserted, which valve is opened by electrical activation when any component is to be driven.
  • a flow restriction 5 In order to achieve the intended effect at the later type of pump, with a flow which is well adapted for the components, a flow restriction 5, a signal line connected to the pump and a heavily restricted relief line 7 is normally required in practice.
  • a flow restriction 5 In order to achieve the intended effect at the later type of pump, with a flow which is well adapted for the components, a flow restriction 5, a signal line connected to the pump and a heavily restricted relief line 7 is normally required in practice.
  • a signal line connected to the pump and a heavily restricted relief line 7 In fig. 4 possible alternative positionings of said auxiliary valves 3 and 4 are shown.
  • the manoeuvring unit 60 fig. 3 shows symbolically three 2-pole electrical switches 61, 62, 63 where the four points at the corners of each of the three symbolizes connection terminals for the three electrical cables that leads to the electro magnets of the valves.
  • the H-formed part at the centre of each switch symbolizes a conducting contact part, which is movable upwards and downwards from a central position of repose.
  • Valves 40a, 40b then remains closed, whereby the power cylinder assumes a neutral fixed load supporting sate.
  • the manoeuvring unit 60 described at this example constitutes merely one of several possible solutions for selectively and simultaneously controlling which valve that shall be activated and inactivated.
  • 3-pole electrical switches, additional diodes, relays and processors may be utilized.
  • single acting power cylinders may be of interest.
  • the piston rod may e.g. be driven out of a cylinder by a fluid via either of the valves 20b, 30b or 40b and flows back the same way when the piston rod is pressed back into the cylinder by an external force, such as the gravity.
  • Corresponding valve i.e. either of 20a, 30a or 40a may then normally be excluded.
  • valve 40b admits and blocks movement of e.g. a working cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Valve Housings (AREA)
EP12152616.4A 2011-01-27 2012-01-26 Ventileinrichtung Withdrawn EP2481933A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1150058 2011-01-27

Publications (2)

Publication Number Publication Date
EP2481933A2 true EP2481933A2 (de) 2012-08-01
EP2481933A3 EP2481933A3 (de) 2016-10-12

Family

ID=45507619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12152616.4A Withdrawn EP2481933A3 (de) 2011-01-27 2012-01-26 Ventileinrichtung

Country Status (1)

Country Link
EP (1) EP2481933A3 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945120A1 (de) * 1979-11-08 1981-05-14 Mogilevskij avtomobil'njy zavod imeni S.M. Kirova, Mogilev Hydraulischer oder pneumatischer antrieb mit mehreren unabhaengig arbeitenden motoren
SE524901C2 (sv) * 2003-10-17 2004-10-19 Bengt Olsson Väljar- och riktningsanordning
US7185953B1 (en) * 2005-08-25 2007-03-06 Tymco, Inc. Surface sweeping machine with a dump door and chute actuating mechanism
DE202007017130U1 (de) * 2007-12-07 2008-02-28 Festo Ag & Co. Ansteuervorrichtung für einen Pneumatikantrieb

Also Published As

Publication number Publication date
EP2481933A3 (de) 2016-10-12

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