US1819461A

US1819461A - Magnetically operated valve

Info

Publication number: US1819461A
Application number: US267586A
Authority: US
Inventors: Leo C Frank
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1928-04-05
Filing date: 1928-04-05
Publication date: 1931-08-18
Anticipated expiration: 1948-08-18

Description

Aug. 18, 1931. c. FRANK 1,819,461

MAGNETIGALLY OPERATED VALVE Filed April 5. 1928 v 5- m F192.

iNVENTOR L60 6. Fran/hv Patented Aug. 18, 1931 UNITED STATES PATENT OFFICE LEO FRANK, OF FOREST HEILLS, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELEC- TRIC & MANUFACTURING COMPANY, A CQRPORATION OF PENNSYLVANIA MAGNETI ALLY bPERATED VALVE Application filed April 5, 1926. Serial No. 267,686.

My invention relates generally to magnetically operated devices and particularly to the operation of pneumatic valves by elec-- devices energized from an alternating current power. source have been found unsatisfactory for the control of air engines since the chatter which is characteristic of an armature operated by an alternating current magnet-is transmitted to the valves.

An object of my invention, generally stated, is to provide for operating a pneumatic valve electro-magnetically from a source of alternating current.

A more specific object of the invention is to provide for operating a mechanism by.

means of an armature actuated by an alternating current magnet without transmitting the chatter of the armature which is characteristic of an armature actuated by an alternating current magnet.

Other objects of my invention will become apparent to those skilled in the art when the following description is considered in connection with, the "drawings in which:

Figure l is a view 'in longitudinal section of an electro-magnetically operated valve mechanism constructed in accordance with my invention.

Fig. 2 is a top plan view of the, valve mechanism shown in Fig. 1.

, Fig. 3 is a view in side elevation of a lever member employed in the transmission of force in the electro-magnetically operated device shown in Figs. 1 and 2, and

Fig. 4 is a View in side elevation of another levermember which co-acts with the lever member shown in Fig. 3 in the transmission of force in a device constructed in accordance with my invention.

Referring now to the drawings, a coil 10 is mounted on one leg of a magnetizable U- shaped core member 11 and is disposed to be connected to a source of electric energy through its terminals 9. When the coil 10 is-excited from a source of alternating current the core member 11 becomes energized and deenergized periodically by the fluctuating current in the coil 10. The flux established in the core member 11, however, attracts the armature member 12, thereby cornpleting the magnetic circuit through core member 11 and the armature member 12. \Vhen in this position a force is exerted through the

levers

13 and 14 upon the plunger 15 of the valve mechanism 16.

The lever member 13 is pivotally mounted by the pin 18 upon the frame structure 17 which also supports the core 11 and houses the valve mechanism 16. The lever member 13 has a bifurcated portion as shown in Fig. 2, into which the armature member 12 nests and is'pivotally mounted through the pin 19. At the back of the bifurcated portion of the lever member 13 a seat 24'is provided into which the coil spring 20 is fitted.

Another lever member 14 is also pivotally mounted through the pivot pin 18 upon the frame structure 17. The hinge portion 21 of the lever member 14 nests within the hinge portion 22 of the lever member 13 at the -with the seat 24 on the lever member 13, is

disposed to retain the coil spring 20 in position between them.

When the levers are in their assembled positions, a force applied to the armature member 12 is transmitted through the lever member 13 to the coil spring 20 which reacts against the seat provided on the lever member 14 and biases the lever qiiember 14 'in a direction to actuate the plunger 15 and open the valve mechanism 16. The lever memberv 14 is, however, biased by the spring 25 into a position at which the plunger 15 will allow the valvefmechanism 16 to remain in its closed position when the armature-12 is disengaged from the core 11. i

It will be seen by reference to the drawings that the lever member 14 is biased in opposite directions about its pivot point 18 by two

separate coil spring

20 and 25. Howto the lever 14 depressing the spring% to its limit and actuating the valve mechanism 16 to its open position without causing any depression in the spring 20. The spring 20 is of greater stifi'ness than the spring and for this reason the spring 25 is completely depressed at the beginning of the counterclockwise motion of the armature member 12. After the lever member 14 has reached 'while the lever'14 is held stationary' its final position, the lever member 13 continues to move, depressing the spring 20 ccordingly any vibration which occurs in the armature 12 after it has reached the limit of its counter-clockwise travel, is absorbed by the spring 20 which biases the lever 14 into its valve actuating-position. I

The chattering, which must necessarily occur, although to a limited extent in an electro-magnetic device operated from an alternating current source of power, is confined to the armature member 12 and the lever member 13, and its transmission to the valve mechanism 16 is prevented by the bufiing effect of the spring 20. Thus when the armature 12 is once sealed in its closed position, such chattering as occurs does not effect the supply of air flowing through the valve mechanism 16 and when once opened the valve inechanism 16 remains open until the coil 10 is deenergized, at which time the armature member 12 returns-to itsopen pos1- tion and the plunger 15 is permitted to return to its uppertposition through the clockwise movement 0 action of the spring 25.

An adjusting screw 26 is provided to limit the air. gap between the armature member 12 and the core member 11 when the armature member 12 is in its open position as well as to compensate the pressures of the

springs

20 and 25 which influence the respective ends of the lever member 14.:

Since it is possible to modify the embodiment of my invention hereinbefore set forth and adapt it to various applications without departing invention, it is desired that the foregoing description construed as entirely illustra-',

tive and not in a limiting sense. 4 I claim as my invention: v I p 1. In an electro-magnetically operated valve, an electro-magnet having an operatthelever 14 caused by the from the spirit and scope of the ing coil disposed to be energized by alternating current, an armature member responsiveto the operating coil, a valve mechanism, a system of co-axially mounted levers' disposed to transmit motion fromthearmature member to the valve-mechanism, one of said levers being pivotally connected to the armature member, and resilient means interposed bet een the pivotally connected lever and anot er lever, whereby one lever may vibrate while the other is held stationary 'by the reaction of the resilient means.

2. In an" electro-magnetically operated valve, in combination, a valve mechanism, an electro-magnet having an operating coil disposed to be energized .by alternating current and an armature responsive to the operating coil, a pivotally-mounted lever disposed to support the armature in an operative position, a second lever pivotally mounted in co-axial' relation to said first lever disposed to actuate the valve mechanism, and a spring member interposed between the free ends of said pivotallymounted levers to provide a resilient connection thereby to prevent the vibrations of valve, an electro-magnet disposed to be energized by alternating current, an armature member responsive to the electro-magnet, a valve mechanism, a plurality of levers pivotally mounted in co-axial relation, one of said levers being connected with said armature, the other of said levers being disposed to engage a push rod, said push rod being disposed to actuate the valve mechanism, and means interposed between said levers for absorbing vibrations which may occur in said armature member.

4. In an electro-magnetically operated valve, an electro-magnet, an armature member responsive to the electro-magnet, a valve mechanism, resilient means for retaining said valve mechanism in its closed position, a pair of lever members for transmitting motion from the armature to actuate the valve mechanism to its open position, a second resilient means connecting said lever members and providing a cushion. between them, said second resilient means being of greater stiffness than said first resilient' means andthereby permitting a flexibility ergiz'edby alternating current, anarmature member responsive to the electro-magnet, a

valvemecha'nism, a plurality of pivotally mounted levers, the first of said levers being connected with said armature, the last of said levers being disposed to engage a push rod, said push rod being disposed to actuate the valve mechanism, a spring disposed to bias said lever out of engagement with said push rod, and resilient, means connecting said first and last lever members for allowing said first lever to have an over-travel after said last lever has reached its final position and opened the valve mechanism.

6. In an electro-magnetically operated valve mechanism, in combination, an armature, an alternating-current magnet having a core and operating coil for actuating the armature, a lever system comprising a pair of levers pivotally mounted in co-a xial rela-- tion connected to the armature and disposed to transmit a predetermined motion to the valve mechanism, a spring member interposed between the separate members. of the lever system to absorb vibrations from the electromagnet, and means carried by one lever for changingthe relative angular positions of the lever members to adjust the operating position of the armature with respect to the core.

7. In an electro-magnetically operated valve, in combination, a valve mechanism, an electro-magnet for actuating the valve mechanism, said electro-magnet comprising a core and a movable armature, a plurality of levers disposed to transmit motion from the armature to the valve mechanism, said levers being disposed to pivot about a common axis, a resilient member interposed between the levers to render one responsiveto the movement of the other, and means for adjusting the relative positions of the levers,

thereby to provide forvarying the air gap between the armature and the core in accordance with changes in the operating volt age for operating the electromagnet.

8. In an electro-magnetically operated valve for controlling fluids, in combination, a valve mechanism, an electromagnet provided' with. a pivotally mounted armature for operating the valve mechanism, a pair of cooperating lever members interposed between the armature and the valve mechanism, said lever members being pivotally secured at a common point and having interfitting end portions, a spring member interposed between the end portions forming a armature for operating the valve, a frame member for supporting the valve and electromagnet in operative relation, a lever pivotally secured to the frame member disposed to support the armature in an operating position, a second lever pivotally secured to the frame member to rotate about the same axis as the first lever, said second lever having one end positioned in cooperative relation to the free end of the armature-actuated lever and its other end positioned for actuating the valve-operating plunger when rotated about its pivot point, anda coil spring interposed between the cooperatively positioned ends of the levers, said spring being under compression when the armature is'closed in response to the energization of the electromagnet, thereby to impbse a reactive force upon the plungeractuating lever in response to vibrations occurring in the armature. 1

10. In an electro-magnetically operated valve mechanism, in combination, a fluidcontrolling valve having a valve-operating plunger, an electro-magnet provided with an armature for operating the valve, a frame member for supporting the valve and electromagnet in operative relation, a lever pivotallv secured to the frame, said lever being disposed to pivotally support the armature of the electromagnet, a spring-biased lever pivotally mounted upon the frame member, said lever being disposed to engage the valve-operating lunger when actuated against the force of the biasing spring, a spring member for resiliently connecting said levers together, said spring having such characteristics as to prevent its depression until the spring-biased lever reaches the end of its travel to open the valve, whereupon LEO C. FRANK.