US3667490A - Electro-pneumatic digital interface - Google Patents

Electro-pneumatic digital interface Download PDF

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Publication number
US3667490A
US3667490A US3667490DA US3667490A US 3667490 A US3667490 A US 3667490A US 3667490D A US3667490D A US 3667490DA US 3667490 A US3667490 A US 3667490A
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Prior art keywords
control
armature
condition
outputs
pressurization
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Clifford W Allen
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Bosch Rexroth Corp
Westinghouse Air Brake Co
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Westinghouse Air Brake Co
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Assigned to BANKERS TRUST COMPANY reassignment BANKERS TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FLUID POWER INC.
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Assigned to FLUID POWER INC., A CORP. OF DE reassignment FLUID POWER INC., A CORP. OF DE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANKERS TRUST COMPANY
Assigned to AMERICAN STANDARD INC. reassignment AMERICAN STANDARD INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANKERS TRUST COMPANY
Assigned to REXROTH CORPORATION, THE reassignment REXROTH CORPORATION, THE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AMERICAN STANDARD INC., A CORP OF DE
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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
    • 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
    • F15B13/043—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 electrically-controlled pilot valves
    • F15B13/0431—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 electrically-controlled pilot valves the electrical control resulting in an on-off function
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/02—Details, e.g. special constructional devices for circuits with fluid elements, such as resistances, capacitive circuit elements; devices preventing reaction coupling in composite elements ; Switch boards; Programme devices
    • F15C1/04—Means for controlling fluid streams to fluid devices, e.g. by electric signals or other signals, no mixing taking place between the signal and the flow to be controlled
    • 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
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/218—Means to regulate or vary operation of device
    • Y10T137/2202—By movable element
    • Y10T137/2213—Electrically-actuated element [e.g., electro-mechanical transducer]

Definitions

  • a rapid responsive electric to pneumatic interface device utilizing an interrupter vane to selectively control fluid flow in a control passage which monitors the continuity of fluid flow in a fluid jet, said interrupter vane being operably positioned responsive to a low level electric signal to an electro-magnet means to selectively position a metallic means attached to said vane.
  • an interrupter vane I mounted on a flexible arm 2 which is rigidly secured to any secure mounting means 3 in a manner that the vane is normally a small distance away from a pole piece 4.
  • the vane is of metallic or ferro-magnetic material with a non-magnetic shim 5 secured thereto to minimize residual magnet forces between the vane and the pole piece 4.
  • a winding 6 energized from a battery 7 when a switch 8 is closed.
  • a passage 9 through the pole piece is located beneath the vane 1 in a manner to be closed off at one end when the arm 2 is flexed due to magnetic attraction between the vane and the pole piece during energization of the winding 6.
  • the opposite end of the passage 9 is connected to a fluidic OR/NOR device to control the flow of fluid therethrough from a supply input 10 to one of two outputs 11 and 12.
  • the OR/NOR devices of .FIG. 1 and 2 are of different modifications with FIG. 1 having auxiliary control ports 13 and 14 and FIG. 2 having an auxiliary control port 15, an over-ride port 16 and a bleed circuit or choke 17.
  • An electric to pneumatic interface device for a fluid pressure system comprising:
  • a pure fluid digital control device having first and second outputs, and a control port subject to variation of fluid pressure to control pressurization of said first and second outputs
  • electro-magnetic means including a magnetic core arranged with a selectively energized control winding, said core having a control passage extending therethrough communicated with said control port, and
  • interrupter means comprising a flexible magnetic armature fixedly mounted at one end and selectively positionable with respect to said control passage to control fluid pressure therein in accordance with said armature opening said control port in one position responsive to one condition of energization of said winding and closing said control port in a second position responsive to a condition of energization of said winding opposite said one condition, said interrupter means further including a magnetic insulator carried by said armature when in said second position in spaced-apart relationship therewith sufficient to limit the residual magnetic force of attraction therebetween to a value less than the force of flexure of said armature.
  • control passage is subject to atmospheric pressure in said one position of said armature to effect one condition of pressurization of said first and second outputs, with flow of fluid pressure thereto being effective to establish subatmospheric pressure in said control passage in said second position of said armature to reverse the condition of pressurization of said first and second outputs.
  • control passage is provided with a supply of fluid pressure which in said one position of said armature is communicated to atmosphere to efiect one condition of pressurization of said first and second outputs and in said second position is effective to pressurize said control passage to reverse the condition of pressurization of said first and second outputs.

Abstract

An electro-pneumatic digital interface device utilizing a low level electrical input signal to control an interrupter vane in a control port to a fluidic device.

Description

United States Patent Allen 1451 June 6, 1972 [54] ELECTRO-PNEUMA'IIC DIGITAL v V R qg es Cited 7 INTERFACE UNITED STATES PATENTS 1 lnvenm Clmord Alien, Lexington, y- 3,304,049 2/1967 Wilkerson ..251/139 [73] A ig W i g Air Brake c p y wfl 3,513,866 Boothe et 137/8 1.5 merding, 3,24 0,219 3/1966 Dexter et al. 1 37/8 1.5 3,543,780 12/1970 Ahern ..137/s 1.5 [22] F1led: Apr. 28, 1970 [2!] Appl. Neg 32 697 Primary Examinerwilliam R. Cline Attorney-Ralph W. Mclntire, Jr.
us. (:1 .L ..137/81.5, 251/139 57 ABSTRACT ....Fl5c 3/08,Fl6k 31/02 I 3. [58] Field of Search ..137/s1.5; 251 /30, 139 elecm'pneummc dev'ce a level electrical input signal to control an interrupter vane in a control port to a fluidic device.
1 3 Claims 2 Drawing Figures ELECTRO-PNEUMATIC DIGITAL INTERFACE BACKGROUND OF THE INVENTION Industrial control systems presently in common use employ v a low-level electrical logic signal which requires interfacing to a fluid device in a fluid power system for controlling industrial machinery utilizing pneumatic or hydraulic cylinders and the like. This interfacing is usually done with solenoid valves limited to low-level signals that function inefficiently and at low speeds of response.
SUMMARY OF THE INVENTION According to the present invention, there is provided a rapid responsive electric to pneumatic interface device utilizing an interrupter vane to selectively control fluid flow in a control passage which monitors the continuity of fluid flow in a fluid jet, said interrupter vane being operably positioned responsive to a low level electric signal to an electro-magnet means to selectively position a metallic means attached to said vane.
DESCRIPTION Referring to the drawing, there is shown an interrupter vane I mounted on a flexible arm 2 which is rigidly secured to any secure mounting means 3 in a manner that the vane is normally a small distance away from a pole piece 4. The vane is of metallic or ferro-magnetic material with a non-magnetic shim 5 secured thereto to minimize residual magnet forces between the vane and the pole piece 4. Associated with the pole piece 4 is a winding 6 energized from a battery 7 when a switch 8 is closed. A passage 9 through the pole piece is located beneath the vane 1 in a manner to be closed off at one end when the arm 2 is flexed due to magnetic attraction between the vane and the pole piece during energization of the winding 6. The opposite end of the passage 9 is connected to a fluidic OR/NOR device to control the flow of fluid therethrough from a supply input 10 to one of two outputs 11 and 12. The OR/NOR devices of .FIG. 1 and 2 are of different modifications with FIG. 1 having auxiliary control ports 13 and 14 and FIG. 2 having an auxiliary control port 15, an over-ride port 16 and a bleed circuit or choke 17.
OPERATION When switch 8 is closed to energize the windings 6, the pole piece 4 will magnetically flex the arm 2 in the drawing the vane 1 to close the open end of passage 9. With the passage 9 closed, the jet flow through the OR/NOR gate will create a partial vacuum in said passage to cause the normal jet flow to output 11 to switch from output 1 1 to output 12 to effect a different control purpose. Thus, the normal jet flow to output 11 to serve a desired pneumatic control function is diverted to the output 12 to serve a different desired control function merely by closing the electric switch 8. Opening of the switch 8 permits the inherent spring force in the arm '2 to return the vane l to its open position. The non-magnetic shim 5 minimizes residual magnetic forces to permit rapid opening of the vane 1 from the pole piece 4. If for some reason the electric switching is inoperative, a small supply of fluid under pressure may be supplied by either of the auxiliary control ports 13 and 14 to divert the jet flow from the output 1 l to output 12.
In the modification shown in FIG. 2, some of the normal jet flow through the OR/NOR device from input 10 to output 11 is bled off through a choke 17 to the normally open control passage 9 in the pole piece 4. When said passage 915 open, the
flow of air through the choke 17 has no effect, however, when switch 8 is closed to effect closure of the passage 9 by the vane 1, the pressure from the choke 17 builds up in passage 9 and causes the jet flow through the OR/NOR device to be switched from output 1 1 to output 12 as desired to serve different pneumatic control functions. In the event of failure of vane operation for any reason, a small supply of fluid under pressure may be delivered via auxiliary control port 15 to divert the normal jet flow from output 11 to output 12. The over-ride port 16 may be supplied with fluid under pressure to over-ride the effect of closing the vane 1 if so desired.
Having now described the invention, what I claim as new and desire to secure by Letters Patent, is:
1. An electric to pneumatic interface device for a fluid pressure system comprising:
a. a pure fluid digital control device having first and second outputs, and a control port subject to variation of fluid pressure to control pressurization of said first and second outputs,
b. electro-magnetic means including a magnetic core arranged with a selectively energized control winding, said core having a control passage extending therethrough communicated with said control port, and
. interrupter means comprising a flexible magnetic armature fixedly mounted at one end and selectively positionable with respect to said control passage to control fluid pressure therein in accordance with said armature opening said control port in one position responsive to one condition of energization of said winding and closing said control port in a second position responsive to a condition of energization of said winding opposite said one condition, said interrupter means further including a magnetic insulator carried by said armature when in said second position in spaced-apart relationship therewith sufficient to limit the residual magnetic force of attraction therebetween to a value less than the force of flexure of said armature.
2. The combination recited in claim 1 further characterized in that said control passage is subject to atmospheric pressure in said one position of said armature to effect one condition of pressurization of said first and second outputs, with flow of fluid pressure thereto being effective to establish subatmospheric pressure in said control passage in said second position of said armature to reverse the condition of pressurization of said first and second outputs. I
3. The combination recited in claim 1 further characterized in that said control passage is provided with a supply of fluid pressure which in said one position of said armature is communicated to atmosphere to efiect one condition of pressurization of said first and second outputs and in said second position is effective to pressurize said control passage to reverse the condition of pressurization of said first and second outputs.
1: k k k

Claims (3)

1. An electric to pneumatic interface device for a fluid pressure system comprising: a. a pure fluid digital control device having first and second outputs, and a control port subject to variation of fluid pressure to control pressurization of said first and second outputs, b. electro-magnetic means including a magnetic core arranged with a selectively energized control winding, said core having a control passage extending therethrough communicated with said control port, and c. interrupter means comprising a flexible magnetic armature fixedly mounted at one end and selectively positionable with respect to said control passage to control fluid pressure therein in accordance with said armature opening said control port in one position responsive to one condition of energization of said winding and closing said control port in a second position responsive to a condition of energization of said winding opposite said one condition, said interrupter means further including a magnetic insulator carried by said armature when in said second position in spaced-apart relationship therewith sufficient to limit the residual magnetic force of attraction therebetween to a value less than the force of flexure of said armature.
2. The combination recited in claim 1 further characterized in that said control passage is subject to atmospheric pressure in said one position of said armature to effect one condition of pressurization of said first and second outputs, with flow of fluid pressure thereto being effective to establish subatmospheric pressure in said control passage in said second position of said armature to reverse the condition of pressurization of said first and second outputs.
3. The combination recited in claim 1 further characterized in that said control passage is provided with a supply of fluid pressure which in said one position of said armature is communicated to atmosphere to effect one condition of pressurization of said first and second outputs and in said second position is effective to pressurize said control passage to reverse the condition of pressurization of said first and second outputs.
US3667490D 1970-04-28 1970-04-28 Electro-pneumatic digital interface Expired - Lifetime US3667490A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089348A (en) * 1976-04-06 1978-05-16 Toyota Jidosha Kogyo Kabushiki Kaisha Reed valve
US20130019840A1 (en) * 2011-07-21 2013-01-24 Hitachi Koki Co., Ltd. Engine and Engine Working Machine
WO2015143516A1 (en) * 2014-03-26 2015-10-01 Whirlpool S.A. Reciprocating compressor provided with suction valves arrangement

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240219A (en) * 1962-11-26 1966-03-15 Bowles Eng Corp Fluid logic components
US3304049A (en) * 1963-01-09 1967-02-14 Gen Electric Fluid control devices
US3513866A (en) * 1967-03-27 1970-05-26 Gen Electric Washing machine with improved liquid and additive dispensing means
US3543780A (en) * 1968-06-17 1970-12-01 Bendix Corp Fluidic or/nor gate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3240219A (en) * 1962-11-26 1966-03-15 Bowles Eng Corp Fluid logic components
US3304049A (en) * 1963-01-09 1967-02-14 Gen Electric Fluid control devices
US3513866A (en) * 1967-03-27 1970-05-26 Gen Electric Washing machine with improved liquid and additive dispensing means
US3543780A (en) * 1968-06-17 1970-12-01 Bendix Corp Fluidic or/nor gate

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089348A (en) * 1976-04-06 1978-05-16 Toyota Jidosha Kogyo Kabushiki Kaisha Reed valve
US20130019840A1 (en) * 2011-07-21 2013-01-24 Hitachi Koki Co., Ltd. Engine and Engine Working Machine
WO2015143516A1 (en) * 2014-03-26 2015-10-01 Whirlpool S.A. Reciprocating compressor provided with suction valves arrangement
CN106460808A (en) * 2014-03-26 2017-02-22 惠而浦股份有限公司 Reciprocating compressor provided with suction valves arrangement
CN106460808B (en) * 2014-03-26 2018-09-04 惠而浦股份有限公司 Reciprocating compressor with inhalation valve

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NL7104526A (en) 1971-11-01
DE2104441A1 (en) 1971-11-11

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