EP0884483A1 - Interrupteur actionné par pression différentielle - Google Patents

Interrupteur actionné par pression différentielle Download PDF

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Publication number
EP0884483A1
EP0884483A1 EP98107635A EP98107635A EP0884483A1 EP 0884483 A1 EP0884483 A1 EP 0884483A1 EP 98107635 A EP98107635 A EP 98107635A EP 98107635 A EP98107635 A EP 98107635A EP 0884483 A1 EP0884483 A1 EP 0884483A1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure
switching valve
differential pressure
valve according
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
EP98107635A
Other languages
German (de)
English (en)
Other versions
EP0884483B1 (fr
Inventor
Martin Dipl. Ing. Heusser
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.)
Hawe Hydraulik GmbH and Co KG
Original Assignee
Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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 Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG filed Critical Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
Publication of EP0884483A1 publication Critical patent/EP0884483A1/fr
Application granted granted Critical
Publication of EP0884483B1 publication Critical patent/EP0884483B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20538—Type of pump constant capacity
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F15B2211/20592—Combinations of pumps for supplying high and low pressure
    • 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
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • 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
    • F15B2211/30505—Non-return valves, i.e. check valves
    • 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
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • 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
    • F15B2211/3057—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 having two valves, one for each port of a double-acting output member
    • 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
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • 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
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • 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
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/411—Flow control characterised by the positions of the valve element the positions being discrete
    • 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
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/426—Flow 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
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50554—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure downstream of the pressure control means, e.g. pressure reducing valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5151—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a directional control valve
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/605—Load sensing circuits
    • F15B2211/6051—Load sensing circuits having valve means between output member and the load sensing circuit
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/615—Filtering means
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/625—Accumulators
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6309—Electronic controllers using input signals representing a pressure the pressure being a pressure source supply pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6306—Electronic controllers using input signals representing a pressure
    • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
    • 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
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/635—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements
    • F15B2211/6355—Circuits providing pilot pressure to pilot pressure-controlled fluid circuit elements having valve means
    • 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
    • F15B2211/7052—Single-acting output members
    • 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
    • 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
    • F15B2211/76—Control of force or torque of the output member

Definitions

  • the invention relates to a differential pressure switching valve in the preamble of the claim 1 specified Art.
  • the differential pressure switching valve is used to one higher-level control unit to report if the by means of a proportional pilot valve set clamping pressure in the hydraulic motor of the clamping device Machine tool is reached or if a predetermined ratio between the pilot pressure and the clamping pressure is present. Only then will the control unit conduct another processing step.
  • the movement of the piston assembly will by an analog displacement sensor, a position switch or an electrical Switches scanned with contacts.
  • the structure of the differential pressure switching valve is complex and multi-part.
  • the pilot pressure must be significantly higher than the reference pressure (Clamping pressure) to the piston assembly against the force of one for the Basic position to be able to adjust necessary spring.
  • the high pilot pressure is unfavorable, because in the proportional pilot valve and a flow control valve connected to it unavoidable, pressure head proportional leaks occur that the Maintaining the pilot pressure makes it difficult or impossible, even if the proportional pilot valve is mechanically blocked if a fault occurs.
  • the increased leakage at the high pilot pressure complicates proper Monitoring the clamping pressure.
  • High standards apply to such clamping devices Security requirements. For example, the clamping pressure in the event of a malfunction held and a correct message to the higher-level control unit are given.
  • a pressure switch which acts on the switching pressure Includes spool, which is via a spring cup with molded plunger actuated the actuating element of the electrical switch.
  • the invention has for its object a differential pressure switching valve to accomplish, that is structurally simple and reliably precise within a large pressure range responsive to the predetermined relationship between pressures.
  • the switch point of the switch should be independent of the pressure value of the set one Clamping pressure over the entire work area as close as possible to the Clamping pressure.
  • the application area for the pilot pressure is a multiple of the application area for that which represents the actual clamping pressure in the clamping device Is reference pressure, can be used to precisely scan the relationship between use a very low pilot pressure, even one Needs to be a fraction of the reference pressure.
  • the to generate the in the jig provided the pilot pressure representing the target clamping pressure Components can be structurally simple due to the low pressure head. Especially the problem of leakage is advantageously eliminated since at the low one Pressure level of the pilot pressure no significant leakage on the pilot side more occurs or a structurally simple measure is sufficient to avoid leakage. This is useful in a tensioning device, in which the pilot pressure the clamping pressure is set and monitored and for safety reasons the parent Control unit must be reported whether the clamping pressure is reached, or Not.
  • This message is also used if there is a fault in the system during the Tension pressure must also be maintained and monitored to prevent damage to avoid for the clamping device or the workpiece. Because of the bias spring the switching points of the switch remain scarce over the entire working range under the clamping pressure, so that at low, but reached a clamping pressure Error message and if the clamping pressure is high and the clamping pressure has not been reached, a Good reporting can be avoided. Because of the low pilot pressure, the differential pressure switching valve well suited for jigs that are always or only temporarily with very high system pressure, e.g. up to approx. 400 bar or more will. The differential pressure switching valve is structurally simple and due to only less Individual parts compact. The axially interlocking pistons enable an optimal short overall length. The stroke of the piston assembly can be chosen short what the use of a simple, short-stroke switch allows and no gear reduction between the piston assembly and the switch as needed.
  • the ratio between the pressures to be compared scan without interference.
  • the smooth movement of the piston assembly by a Misalignment between pistons is not affected. Furthermore, the move smaller, second pistons loaded by the reference pressure without jamming force, although it mechanically attacks the larger first piston.
  • the biasing spring is directly between in a structurally simple manner the two pistons effective.
  • the bias of the bias spring for example by screwing the lens body or by inserting or removing it change washers as required.
  • the switch is the one to which the pilot pressure can be applied Chamber sealed, due to the low pilot pressure a simple seal is sufficient here.
  • the switching point of the switch can be adjusted if necessary the switch housing or the switch can be precisely adjusted in the frame.
  • the switch is a small, inexpensive microswitch with a short stroke.
  • an electrohydraulic tensioning device S in FIG. 1 in particular for a Workpiece or tool of a machine tool, the movements of a Hydraulic motor W used for clamping, and the clamping pressure and possibly monitoring a return pressure to a higher-level, not shown Control unit, e.g. a turning, drilling, milling machine or the like, operation steps display and report whether each operation step is correct or incorrect is executed.
  • the hydraulic motor W reported and whether the predetermined clamping pressure is reached or not, and regardless of the selected height of the clamping pressure.
  • Two pumps P1 and P2 are provided as the pressure source, which are driven by a motor M to be driven.
  • the pump P1 is for a larger flow rate and a high one System pressure, e.g. for storage charging using a pressure accumulator 1 ', and connected to a pump line 1 and a return line 2.
  • the pump P2 with a smaller delivery rate is connected to its own pressure line 3 and via one Pressure limiter 4 connected to the return line 2, the pressure limiter 4 the pressure in the further pressure line 3 to a low value, e.g. 25th Bar, limited.
  • Both pumps P1, P2 are constant feed pumps.
  • An essential part of the tensioning device S is a hydraulic control device H with an adjusting device E for the clamping pressure.
  • the setting device is a Proportional pilot valve V and a safety valve F arranged downstream of it, wherein the proportional pilot valve V to one of the further pressure line 3 branching control line 20 connected and with the safety valve is connected via parallel control lines 14, 15.
  • the control line 14 leads one from the proportional pilot valve V depending on the energization of a proportional solenoid P variable pilot pressure, while the control line 15 with an unlocking pressure for the safety valve F (in the embodiment shown a seat valve 7) which can be released hydraulically against a spring 8 can be acted upon.
  • the adjusting valve D is a pressure regulating in the embodiment shown Pressure reducing valve, which via a line 19 to the pump line 1 and a line 21 is connected to the return line 2, and of which one Supply line 17 to a directional control valve consisting of two seat valves J extends, the two seat valves (for example 3/2-way valves) with the Hydromotor W (e.g. a double-acting hydraulic cylinder) via consumer lines 5, 6 are connected.
  • Clamping pressure controlled by the setting valve D in dependence on the pilot pressure in the control line 12 in accordance with the energization of the proportional magnet P is set and held in its pressure value.
  • a differential pressure switching valve L provided with a switch G
  • structurally from Adjustment valve D is used separately between the control line 12 and a control line 22.
  • the control line 22 branches off from the consumer line 5 and has one reference pressure derived from the clamping pressure.
  • a throttle 42 can be arranged near the differential pressure switching valve L.
  • the differential pressure switching valve L by a bias spring 23 in the effective direction of the differential pressure.
  • the control valve D is a by a control pressure from the supply line 17 Control spring 11 acted upon.
  • the control spring 11 is actuated by an actuating piston 10 in a Chamber 9 so loaded that the effective spring force of the control spring 11 directly depends on the pilot pressure which acts in the chamber 9 via the control line 12. Will the pilot pressure by changing the energization of the proportional solenoid P raised, then the clamping pressure is raised accordingly, and vice versa.
  • the adjusting valve D keeps the clamping pressure at the set one Height.
  • the differential pressure switching valve L with its switch G is also then still able to correctly report whether the clamping pressure is present or not.
  • the clamping pressure can be up to 400 bar or more, while the pilot pressure in the control line 12 is less than that set by the pressure limiter 4 Pressure in the further pump line 3. It can, for example: only between 3 and 20 Bar, i.e. only a fraction of the clamping pressure.
  • the hydraulic motor W like the directional control valve J designed as a seat valve leakproof. Leak tightness is also given for adjusting valve D, such as also in the differential pressure switching valve L and in the safety valve in the shut-off position F. This means that the clamping pressure or reference pressure in the Control line 22 as well as the pilot pressure in the control line 12 over considerable Time can be kept unchanged.
  • the directional control valve J could be a single one, e.g. 4/3-way control valve, expediently in seat valve design.
  • a single pump could also serve as a pressure source, whereby then appropriately an additional pressure reducing valve upstream of the proportional pilot valve V. is provided in the control line 20 to the input pressure of the proportional pilot valve V to the sufficient for the low pilot pressure To reduce the pressure height.
  • the control line 20 could be from the Branch off pump line 1 or pressure line 19.
  • the differential pressure switching valve structurally combined with the switch G in FIG. 2 L points in a housing 24, a housing bore 25 in which a first piston 26, expediently a pot piston, sealed with a large contact area A1 is movable.
  • the piston 26 carries a plunger 27, which is on an actuating element 28 of the switch G designed as a microswitch is aligned and a sealing body 29 containing a seal 30 penetrates the Switch G facing the end of the housing bore 25 closes.
  • the first piston 26 dips from the surface facing away from the action surface A1 Side a coaxial second piston 31, which has a cylinder portion 32 with an acting surface A2 has, which is significantly smaller than the exposure area A1.
  • the ratio between the application areas A2 and A1 can be between 1: 5 and about 1:25, and is preferably about 1:15 to 1:20.
  • the second piston 31 preferably has an axial distance from the cylinder section 32 spherical driver head 33, which with a driver surface 34 in the first Piston 26 cooperates and one that transmits movement to the right in FIG. 2 Coupling forms.
  • the driver surface 24 is conical, on the one hand around the second piston 31 in addition to lead, on the other hand to any relative movements between the Allow pistons 26, 31.
  • a disc body 35 is positioned in the housing bore 25 and has a guide bore 36 for the cylinder section 32 of the second piston 31 contains.
  • the lead length the guide bore 36 is expediently shorter than the diameter of the cylinder section 32.
  • Adjacent to the disk body 35 is in the Housing bore 25 inserted a sealing part 38 sealed in a seal 39 a sliding sleeve 40 is positioned, in which the cylinder section 32 is also displaceable is such that the pressure surface A2 of the second piston 31 in one Chamber 41 is located via the throttle 42 (see FIG. 1) to the control line 22 for the Reference pressure can be connected.
  • the switch G is contained in a switch housing 43, which is in a frame 44 is fixed to the housing 24 and may be used to adjust the switching point of the actuating element 28 in the axial direction of the housing bore 25 can be adjusted.
  • the biasing spring 23 (see FIG. 1) has one end on the disc body 35 supported and is at its other end to a ring 45, the is intercepted on the driver head 33.
  • the switch G is the one not shown higher-level control unit of the tensioning device is electrically connected. The interior of the first piston 26 and the gap between the housing 24 and the frame 44 are relieved of pressure to the return T.
  • the differential pressure switching valve L is in a switching position in which the clamping pressure is reported because the plunger 27 pressed the actuating element 28 Has.
  • the pilot pressure acts on the larger area A1 while the reference pressure acts on the smaller application area A2 Via the driver head 33, the first piston 26, for example until it comes into contact with Sealing body 29, adjusted.
  • the bias spring 23 acts in the same direction as that Reference pressure on the contact surface A2. Falls with unchanged Pilot pressure the reference pressure, then the first piston 26 in Fig. 2 to the left moves until the plunger 27 releases the actuator 28.
  • the switch G reports "Tension pressure not available".
  • the switching point of switch G must be independent of the pressure value of the clamping pressure are just below the clamping pressure. Were the bias spring 23 not would exist, then for low clamping pressure below this low The corresponding switching point of the switch at high clamping pressure are too far below the high clamping pressure. The desk would respond too early at high clamping pressure and a faulty good signal submit.
  • the ratio between the application areas A2 and A1 adjusted so that the switch point of the switch at high clamping pressure would be optimally just below the high clamping pressure, then the corresponding would be Switching point at a low switching point above the low clamping pressure, so that no good signal would be generated at low clamping pressure.
  • the bias spring 23 causes an adjustment of the line of the switching points (the line of the switching pressures) to the Span pressure line over the entire work area such that the two lines in the are essentially parallel to each other and the switching points for all clamping pressures only are just below the respective clamping pressure.
  • the differential pressure switching valve D with its switch G is therefore able to operate over a very wide clamping pressure range generate correct and meaningful signals, i.e. The relation between the reference pressure and the low clamping pressure regardless of the height of the reference pressure or the pilot pressure.
  • differential pressure switching valve can be constructed differently with the same function.
EP98107635A 1997-06-10 1998-04-27 Interrupteur actionné par pression différentielle Expired - Lifetime EP0884483B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29710128U DE29710128U1 (de) 1997-06-10 1997-06-10 Differenzdruck-Schaltventil
DE29710128U 1997-06-10

Publications (2)

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EP0884483A1 true EP0884483A1 (fr) 1998-12-16
EP0884483B1 EP0884483B1 (fr) 2003-08-13

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EP98107635A Expired - Lifetime EP0884483B1 (fr) 1997-06-10 1998-04-27 Interrupteur actionné par pression différentielle

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EP (1) EP0884483B1 (fr)
AT (1) ATE247233T1 (fr)
DE (2) DE29710128U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29808294U1 (de) 1998-05-07 1998-08-13 Heilmeier & Weinlein Elektrohydraulischer Spannmodul
DE29809936U1 (de) 1998-06-03 1998-10-08 Heilmeier & Weinlein Differenzdruck-Schaltventil mit elektrischem Schalter
WO2016061655A1 (fr) * 2014-10-24 2016-04-28 Halliburton Energy Services, Inc. Interrupteur sensible à la pression pour actionner un dispositif

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419692A (en) 1967-01-16 1968-12-31 Sigma Netics Inc Pressure responsive actuator wherein a spring is adjusted by rotation of the housing to change actuation pressure
DE2219928A1 (de) 1972-04-22 1973-10-31 Teves Gmbh Alfred Ventil fuer die betaetigung eines elektrischen schalters (druckschalter)
DE2310193B1 (de) 1973-03-01 1974-04-25 Index Werke Kg Hahn & Tessky Sicherheits-Druckregelventil zur Einstellung eines konstanten Arbeitsdruckes
DE3819459A1 (de) 1988-06-08 1989-12-14 Festo Kg Druckgesteuerte elektrische schalteinheit
DE4423585A1 (de) 1993-07-21 1995-01-26 Heilmeier & Weinlein Elektrohydraulische Steuervorrichtung
DE4423541A1 (de) 1993-07-21 1995-01-26 Heilmeier & Weinlein Proportional-Druckregelventil in Schieberbauweise
DE4446538A1 (de) 1994-12-24 1996-06-27 Bosch Gmbh Robert Hydraulische Spanneinrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3419692A (en) 1967-01-16 1968-12-31 Sigma Netics Inc Pressure responsive actuator wherein a spring is adjusted by rotation of the housing to change actuation pressure
DE2219928A1 (de) 1972-04-22 1973-10-31 Teves Gmbh Alfred Ventil fuer die betaetigung eines elektrischen schalters (druckschalter)
DE2310193B1 (de) 1973-03-01 1974-04-25 Index Werke Kg Hahn & Tessky Sicherheits-Druckregelventil zur Einstellung eines konstanten Arbeitsdruckes
DE3819459A1 (de) 1988-06-08 1989-12-14 Festo Kg Druckgesteuerte elektrische schalteinheit
DE4423585A1 (de) 1993-07-21 1995-01-26 Heilmeier & Weinlein Elektrohydraulische Steuervorrichtung
DE4423541A1 (de) 1993-07-21 1995-01-26 Heilmeier & Weinlein Proportional-Druckregelventil in Schieberbauweise
DE4446538A1 (de) 1994-12-24 1996-06-27 Bosch Gmbh Robert Hydraulische Spanneinrichtung

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EP0884483B1 (fr) 2003-08-13
ATE247233T1 (de) 2003-08-15
DE59809258D1 (de) 2003-09-18
DE29710128U1 (de) 1997-08-14

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