Electromagnetic actuator

• US 4,458,487 A
• Filed: 03/15/1982
• Issued: 07/10/1984
• Est. Priority Date: 10/31/1980
• Status: Expired due to Fees

• Current Assignee: Yamatake-Honeywell Company Limited
• Original Assignee: Honeywell Incorporated (Honeywell International Inc.)
• Inventors: Tanaka, Kazuyoshi, Tanaka, Hitoshi, Kojima, Tadashi, Ichida, Shunji, Morozumi, Eiichi, Inoue, Kentaro, Uchihama, Tetsuo, Morio, Shyuji
• Primary Examiner(s): Croyle, Carlton R.
• Assistant Examiner(s): Stout, Donald E.
• Application Number:
  US06/361,928
• Time in Patent Office: 848 Days
• Field of Search: 417/417, 417/388, 251/30, 60/477, 60/491
• US Class Current: 60/477
• CPC Class Codes: F04B 17/046 the fluid flowing through the moving part of the motor
• CPC Class Codes: F23N 1/005 using electrical or electromechanical means F23N1/04 - F23N1/10 take precedence
• CPC Class Codes: F23N 2227/04 Prepurge
• CPC Class Codes: F23N 2227/36 Spark ignition, e.g. by means of a high voltage
• CPC Class Codes: F23N 2229/00 Flame sensors
• CPC Class Codes: F23N 2235/12 Fuel valves
• CPC Class Codes: F23N 2235/24 Valve details

Abstract

An electromagnetic actuator utilizing a fluid pressure obtained from an electromagnetic pump, wherein according to the present invention, there is provided a responsive member displaceable in response to the pressure of a fluid forced into a second chamber from a first chamber. The responsive member displaceable as described can operate a valve member or the like coupled thereto in an on-off control or a proportional control with a large stroke in a reliable manner.

Claims

1. An electromagnetic actuator comprising:

an electromagnetic pump for continuously supplying a fluid from a first chamber to a second chamber in accordance with an output of a driving device;

a passage interconnecting said first and second chambers;

a responsive load means comprising a responsive member responsive to a pressure in said second chamber and a load driven by said responsive member, and operable for controlling the mechanical displacement of said load; and

a flow-rate control means provided in said passage for maintaining the pressure in said second chamber at a determined value.

2. An electromagnetic actuator as set forth in claim 1 wherein said flow-rate control means is an orifice.

3. An electromagnetic actuator as set forth in claim 2 wherein said responsive load means comprises said responsive member and a slidable rod mechanically linked thereto, and said responsive member is made of a flexible material.

4. An electromagnetic actuator as set forth in claim 3 wherein said driving device comprises a control circuit which generates an output pulse current and varies effective value of said pulse current for controlling the delivery of said electromagnetic pump, and a feed-back circuit which detects said current flowing through the electromagnetic winding of said pump and feeds it back to said control circuit in a direction maintaining said delivery of said pump at a constant value.

5. An electromagnetic actuator as set forth in claim 4 wherein said output pulse current obtained from said control circuit is a controlling output for controlling said slidable rod in a two-position control or a proportional control manner.

6. An electromagnetic actuator as set forth in claim 5 wherein said load is a valve device or a damper for controlling flow rate of a fluid.

7. An electromagnetic actuator comprising:

an electromagnetic pump for continuously forcing a fluid through a first passage from a first chamber to a second chamber under operation of a plunger and a check valve reciprocable at a frequency corresponding to that of a driving signal supplied to an exciting coil of said pump;

a second passage provided in said electromagnetic pump for by-passing said check valve so as to interconnect said first and second chambers;

a movable member which closes said second passage under a magnetic force of said exciting coil when a driving signal is applied to said exciting coil, and thereby elevates the pressure in said second chamber;

a responsive member displaced in response to the pressure in said second chamber; and

a responsive load means including a coupling member for mechanically coupling said responsive member to a load.