US2402732A - Automatic valve - Google Patents

Description

June 25, 1946. T COHEN I 2,402,732 I AUTOMATIC VALVE 7 Filed Dec. 31, 1942 y S q g 7! 2- v 3 flew/W04- 62% en, INVENTOR,

BY JM 2 M,

Patented June 25, 1946 AUTUMATIC VALVE Theodore A. Cohen, Chicago, 111., assigncr to Wheclco Instruments 00., Chicago, 111., a corporation of Illinois Application December 31, 1942, Serial No, 470,918

1 Claim. i

This invention relates to automatic valves in general and more particularly to such valves as are especially adapted for use Where slow opening and instantaneous closing is desired.

In automatic control systems for fuel burners guarded by flame failure safety apparatus, in particular, it is important to have a slow opening fuel valve especially in. large fuel feeding mains so as to allow igniting oi the burner gradually before the large inrush of fuel is capable of causing an explosion. The closing of the valve, on the other hand, should be instantaneous in event of flame iallure at the burner to prevent accumulation or" fuel in. the combustion chamber which also may cause an explosion.

The primary object 0:? this invention is accordingly to provide such an automatic valve havautomatic means for slowly opening the same and for instantaneously closing the valve upon the occurrence of a predetermined contingency such, ior example, as fiance failure at a burner to wh ch the valve was supplying fuel, or power failure.

Uther and further objects or this invention will be more apparent hereinafter as the same leecomes better understood from an examination of specification and claim in conjunction with the accompanying drawing wherein:

i. is a vertical sectional view of an autome .e valve and automatic operating mechanism therefor embodying this invention;

. 2 is diagrammatic and schematic view c operating means of the valve.

to the drawing more par iculariy,

t eference character designates a valve body cast a partition 4 separating the interior of the hotly between said openings. e lower part of c l, below the partition is cast open such opening is closed by a plate bolted on said hcdy. The upper art of the a eve the partition is cast and aided with a flange around the opening to is apertured to provide a valve .1;-

dish 3 is mounted on the lower end of a plunger and is normally held in closed positi 'o. a plunger extends unwardly through a in the bottom of casting 22a and is provided, on. its upper end, with a armature h. bellows l surrounds the l plunger 5, above the bearing in the casting to;

h is casting to which acts to close ill ing the electrical connections of the autoand below said armature 8 and is sealed to said casting and armature to prevent the escape of fuel gases, from the body, through the bearing 6, to the surrounding atmosphere. v

The upper part of the casting 2a acts to support an operating electro-magnet ll having a winding it and an operating stem 13. The stem it extends upwardly through a bearing l3a in the castin 2a aligned above the bearing 6 and said stem it is operated by'mechanism as follows:

An electric motor it is mounted on the casting to and is provided with a gear drive ll which operates a drive shaft 58 having a cam it. A cam follower it is mounted upon a laterally extending shaft 2i attached to the upper end of stem l3.

A limit switch ii is mounted on the base of casting 2a and cooperate with an operating stud lid on the armature 53 so that when the valve is closed said switch will close and when said valve opens as hereinafter described contact to of said switch will be opened.

A second limit switch it is mounted at the top of casting 2c and cooperates with an operating stud l?) on the stem it of the operating ical connections are as shown in supply 25 is connected to magnet "ough flexible leads Ma. The Incconnected acros the line 25 in such Operation rnally closed under the action in Fig. 2. Upon power being winding ill of electro-magzed but magnet l i being a tractive electrc niag does not lift armature ii. Motor d through limit switch contact to. revolves cam it whereupon shaft i switch it thereby deenergizing motor l6 leaving c be energized if either limit switch close valve and shuts oil fuel supply. When armature 8 reaches position shown in Fig. 2 with valve closed, limit stud I0 strikes limit switch 9, closing contact to which again completes the circuit to motor I so that upon the resump- I tion of power supply at 25 the opening cycle will be repeated. Thus a valve action is secured which is slow'opening and snap closing.

I am aware that many changes may be made and details varied without departing from the principles of my invention and I therefore do not wish to be limited to the details shown and described.

- I claim: I The combination of an automatic valve comprising a valve body, a valve closure therein,

spring means normally acting to close same, an armature connected to said closure, an electric motor, a reciprocable electro-magnet adapted to adhere to said armature, when energized and adiacent thereto, driving means for reciprocably moving said electro-magnet in a straight line, connecting said motor and electro-magnet, to retract the same, together with said closure, against the action of said spring to open the valve, switch means adapted to open a circuit to said motor when said electro-magnet has been moved to its extreme retracted position, electrical connections for said motor and electro-maanet to a source of power whereby failure of said source will deenergize the electro-niagnet to permit said sprin to close said valve and so connected to said switch means as to permit the motor to be stopped as aforesaid without deenersizing said electromagnet when said source is present and a second switch means so connected to said source and the first switch mean as to energize said motor when said source is again turned on and the valve is closed even when the electro-maanet is in extreme retracted position and the first switch means is open to permit said electro-m snet to move back to said armature to reensage the some and again open said valve upon the retractive movement of the electro-magnet, said electromagnet and armature forming an electro-ma netic detent or the like.

THEODORE A. COHEN.

Images