US2358999A - Solenoid operated valve - Google Patents

Description

Sept. 26, 1944.

Filed Aug. 22, 1941 2 Sheets-Sheet l WILL/AM A. IQAY,

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Patented Sept. 26, 1944 UNITED STATES PATENT OFFICE somuom OPERATED VALVE William A. Ray, Glendale, Calif.

Application August 22, .1241, Serial My present invention relates to fluid control valves, particularly those of the solenoid operated type, and to control means associated therewith.

An object of my invention is the provision of an electromagnetically operated valve having novel means for sealingly separating the electromagnetic means from the fluid controlled by the valve; a further related object being the provision of means for preventing escape of the fluid in the event of rupture of said separating means.

Another object is the provision, in an automatic electrically-operated valve, of novel means for manually operating the valve upon failure of electrical energy supply and for maintaining the valve in operated condition, which means is rendered inoperative upon restoration of the supply to permit resumption of automatic operation.

Another object is the provision of a solenoid operator, particularly adapted for energization by alternating current, including means for quelling vibration of the plunger when such current is employed; a more specific related object being the provision of means for applying a lateral force on one end of the plunger while maintaining its other end centered in the sleeve within which it is reciprocable.

Another object is the provision of means for delaying the actuation of condition-controlling means, such as switching means, for a predetermined interval after the operation of movable means, such as a valve operator; the delaying means being efiective subsequently to delay the deactuation of the condition-controlling means for a predetermined interval after the return of the movable means to unoperated position. Another object is the provision, in a time-delay system of the character described, of means for efiecting a two-way snap-action of the condition-controlling means.

Other objects and advantages of my invention will be found in the description, the drawings, and the appended claims. v For complete understanding of the invention, reference may be had to the following detailed description and accompanying drawings, where- Figure 1 is a vertical sectional view of a solenoid-operated valve embodying features of my invention;

Figures 2 and 3 are'fragmentary views, simi-' lar to that of Fig. 1, showing the parts in positions assumed in operation;

(Cl. ELI- 5133) Figure 4 is a plan. of the valve shown in 1; Figure 5 is a. vertical section taken along the irregular line 5-5 of Fig. 1;

Figure 6 is a fragmentary horizontal section taken along the line 5-4 of Fig. 5;

Figure 7 is a side elevation taken in the plane of line 1-7 of Fig. 5 with the housing 55 broken away to show, in particular, the time-delay mechanism; and

Figure 8 is a diagrammatic view of the apparatus shown in the other figures, along with an appropriate electrical control circuit therefor.

In the drawings, the numeral ll indicates a valve casing-having an inlet 12' and an outlet ii, the inner portion of the casing adjacent to which is built up to provide an annular valve seat 84. Cooperable with this seat is a dished closure member l5 secured to one end of a valve stem Hi, the other end portion of the stem extending freely through a central opening in an apertured cup-shaped washer ll located in the inlet of the casing and held from outward movement by a wire ring l8 snapped into a groove formed in the inlet wall and engageable with the periphery of the washer. A spring l9, surrounding the valve stem 56 and compressed between the washer ii and a nut 2d threaded on an intermediate portion of the stem, serves to urge the closure member it toward its seat and the washer ll against its retaining snap ring. The periphery of the closure member ii is guided by three spaced portions 2i extending from the innor wall of the casing.

Covering an opening in the top wall of easing ii is a flexible diaphragm 22, of material such as leather or thin sheet metal, the marginal portion of which is clamped between the casing and the bottom flange 23 of a sub-housing, generally indicated at 24, attached to the casing. Pivoted on a pin 25 mounted in spaced brackets 26 attached to horizontal platforms 21 extending from the upper inner side walls of the easing (Fig. 5) is a U-shaped arm 28, the rounded lower extremities of which straddle the portion of valve stem it between the closure member i5 and nut 20. The upper cross-portion of arm 28 abuts the underside of diaphragm 22 and above it is the medial portion of a channelled lever 29, the arm 28 and lever 29 being secured together and to the diaphragm at these portions by screws. It is thus apparent that the arm and the lever can be rocked as a unit on pin 25 to operate the closure member IS, the pin 25 being located as close as is practicable to the shown in. Fig.

plane of the diaphragm so as to minimize fiexure of the same. The general valve-operating arrangement thus far described is disclosed and claimed in my copending application Serial No. 378,756, filed February 13, 1941.

The sub-housing 2B is of generally rectangular form and comprises side walls it turned up from flange portion 23 (Fig. end walls 3i, and an overlapping top wall 32; the walls being secured together as by welding or solder to form, together with diaphragm 22, a sealed compartment.

Threaded in an opening in an inclined portion of the top wall 32 is a solenoid device, generally indicated at 33, comprising a sleeve 36, the upper end of which is closed by a plug 35, and a plunger 36 freely reciprocable in the sleeve and limited in upward movement by a round-ended stop pin 37, secured in plug 535, which cooperates with a concentric conical recess 38 in the u per end of the plunger to center that end in the sleeve when the plunger is attracted by the energization of coil 35. The plunger is generally square in cross-sectiomits corners being rounded so that the plunger is a loose fit in the sleeve. The corners 6d of the lower end of the plunger are slightly larger in diameter (but still consid-- erably smaller than the internal diameter of the sleeve) so that, if a lateral force is applied to the lower end of the plunger when it is in its attracted position, only these corners can engage the sleeve. The general solenoid construction shown herein is disclosed and claimed in U. S. Patents No. 2,096,763, to Ray et al., and No.

2,098,195, to Ray, and will not herein further be described.

The lower end portion of the plunger 36 is axially slotted to receive one end of a link B5 which is pivoted on a pin 86 secured in the plunger; the other end of the link being pivoted on a pin 41 extending between the side walls of the bent-up left-hand end portion of the channelled lever 29. Between the link and a side wall of the lever is an end portion of an arm 48 which is secured at its thickened other end to arod 49 sealingly :lournalled in openings in the side walls 30 of the sub-housing, for a purpose hereinafter to be described. The arm 88, being rotatable on a center different to that of the unit composed of lever 29 and arm 28, is slotted to receive pin 41.

By its linked connection with lever 29, when l the solenoid plunger is attracted by energization of coil 3%, arm 28 is rocked to move closure memher it to its open position against the bias of spring l9. It will be noted that the counterforce of spring 89 is applied laterally to the lower end of the plunger (the general axis of movement of link 65 being at an angle to the ems of the plunger) so that (while its upper end is centered by pinv 3?, its lower end portion 6E6 is held tightly against the right-hand side of the'sleeve, as is 2. The components of magnetic and mechanical forces applied to the plunger in its attracted position serve to prevent vibration and hum when the solenoid is energized by alternating current. Due to the inclined position of the solenoid, gravity acting on the plunger also contributes to-this efiect, and may, in modified constructions, be the controlling factor.

Extending through an opening in a horizontal portion of the top wall 32 of the sub-housin is a rod 50 which is provided at its lower end with a conical head 5i, spaced above which, and

upper facing 53 of leather, or the like. The upper portion of the rod Ed is guided in an opening in the top portion of a U-shaped bracket so, mounted on the wall 32, and extends freely through an aligned opening in the top wall of a cylindrical protective housing 55, which is frictionally mounted on the turned-up peripheral portion of flange 23. Rod Evil is urged upwardly by a spring 56, secured at one end to the rod and at the other to the Wall 32, so that in the normal position of the rod as shown in Fig. l the collar 52, by its facing 53, seals the adjacent opening around the rod. It will be noted that,

- in the event of rupture of the diaphragm, leakage of fluid would be confined to the space defined by the interior of the sub-housing and the solenoid sleeve. The head 5i of rod id is cooperable with the hooked end 5? of the bent-up right-hand end portion of lever 29. in the event of failure of electrical supply for the solenoid 33, the valve may be operated by manipulation of rod 6i]. When this rod is moved downward by finger pressure on a button 58, the lever is is rocked, the hook 5i riding on the tapered surface of cone 5i until it drops into the recess 59 between the cone and collar 52, the parts assuming the positionsshown in Fig. 3. Pressure on button 58 may'now be released-the closure member 115 being held in substantial iull-open position by engagement of hook 5? with head 56.

It will be noted that, in the manual opening of the valve, the solenoid plunger 36 is moved ill) only partially toward its attracted position, so that upon resumption of electrical supply it is moved still further upward, thereby rocking lever 29 so that the engagement of hook 51 with the head M is released and the rod 50 returns to its normal raised position under the influence of spring 56.

As seen in Fig. 6, the guide hole for rod 50 in the top portion of bracket 54 provides a tongue which extends into a shallow slot 6| formed in the upper side wall of rod 50. This slot is wider at its upper end than at its lower, so that limited rotation of the rod is. permitted when it is in its depressed position. Spring 58 is so arranged that it exerts a rotative force on rod 50 tending to retain the vertical, or right-hand, side of the slot Si in engagement with the tongue 60. If it, is desired to reclose the valve (after it has been manually opened) before the resumption of electrical supply, the button 58 is rotated to its Release position shown in Fig. 4 against; the torsional bias of spring 58, thereby bringing a flattened or cutaway surface 62 of the otherwise conical head 5! into register with hook hi so that the rod can then move upward to close the valve.

If the solenoid is connected to the electrical manually opened, should immediately close if the limit-control is callingior such operation. However, under such condition 01 the limit-control, its switching means would generally be open, so that no energy would normally be available at the solenoid for raising its plunger to release the manual holding means. To overcome this defeet, I have provided switching means, actuated by the manual valve-operating means, whereby the same will be released upon resumption of electrical service regardless of the condition of attached to the rod, is a collar 52 having an 76 the limit-control. These means are more clearly shown in Fig. 5 and comprise a pair of resilient contact blades 65 and 66 which aremounted on an insulating 'base 61 by means of posts 68 and 69, respectively; the base being attached to the ear portions of the bracket 54. In the downward movement of rod 50, a pin H (preferably of insulating material) carried thereby, engages blade 65 and flexes it into contact with blade 66, as shown in Fig. 3. Post 68 is connected by a wire to a terminal plate 12 and post 69 to another plate I3, to which plate one lead of the solenoid is also connected. The other solenoid lead is connected to a third terminal plate 74. The corresponding terminal posts shown on housing in Fig. 'l have been assigned primed numerals. Referring to the corresponding diagram of Fig. 8, it will be seen that the contact blades are connected in shunt with the terminals of a thermostat 15, and that the thermostat is connected in series with the power supply terminal l5 and one lead of the solenoid, the other solenoid lead going directly to the other power supply terminal ii. The blades and 6?, when in contact, thus cornplete a circuit from the power supply terminals to the solenoid independent of the thermostat, so that upon resumption of electrical service the solenoid plunger is attracted to its fully-raised position, releasin the rod 5d, the resultant upward movement of which effects disengagement of the contact blades. If the thermostat switch is now in closed condition, the plunger remains in energized position since the solenoid is connected to the power terminals through this switch; but if the thermostat switch happens to be open, after the plunger is initially attracted it then falls when the blades 65 and 66 separate.

Referring now more particularly to Fig. 7 and the corresponding diagrammatic showing of Fig. 8, rod 49 is connected by arm 48 to the lever 29 so that it moves in accordance therewith, as was described hereinabove. Yieldably connected to an end of rod 49, exterior to the sub-housing 24, by its volute portion 80, is a resilient arm 8! which insulatingly carries on its free end a contact element 82. Cooperable with this contact element is another similar element 83 mounted on a bracket 84 which is insulatingly attached to the flange 23. Insulated terminals 85 and 86 are provided for the electrical connection of the contact elements in a circuit, terminal 85 being connected to element 82 by a flexible wire or. Also mounted by one of it ends on flange Z8 is a U- shaped bimetallic member 88, the free end of which carries a head 88 normally positioned immediately above a solid portion or arm ti and adjacent an opening 9t formed therein, this opening being of such size and shape as to freely receive the head 89 and the portion of member 88 to which it is attached. Wrapped around a portion of thebimetaliic member is a resistance coil Q! which, when energized by passage of current therethrough, is effective to heat the bimetallic member so that its free end warps in a left-hand direction.

When the solenoid is energized, in the opening movement of the valve the rod 39 is rotated in a clockwise direction (as viewed in Fig. 7) so that arm Si is moved into engagement with the head 89 of the bimetallic member, additional rotation of the'rod efiecting fiexure of the arm and, in particular, of its volute portion As shown in Fig. 8, the resistance coil Qi is connected in parallel with the solenoid coil so that heating of the bimetallic member is now initiated. After a predetermined interval, warping oi the bimetallic member moves its head 88 into register with openingSO with the result that arm 8| is suddenly projected upward, bringing contact elements 82 and 83 into engagement, as is shown in broken lines in Fig. 7. In this position of arm 8|, the upper edge of the head 89 is latched under the portion of arm 8! adjacent the left-hand edge of opening 90 due to the arcuate path of the end of this arm. Continued energization of the resistance coil eiTects slight additional movement of the bimetallic member in a left-hand direction until the portion thereof above head 89 is in engagement with the left-hand edge of the opening, in which position it remains during the energization oi the resistance coil and solenoid. Should such energization now be discontinued, the valve closes and the arm 8i tends to assume its normal position. However, due to the engagement of head 89 with the underside of arm 8 i, the same is restrained from movement until the oimetallic member cooled sudiciently to again bring its into register with whereupon arm moves suddenly do opening contacts Gil and E2. The time-delay ture may, for example, be advantageously employed in connection with the control of the circulating fan of hot-air heating system. Refer ring to Fig. 8 and assuming that the closure memterval after the opening of the valve, and its oper-- ation will be continued for an interval after the reclosing of the valve, so that the air will be circulatecl while, and only while, it is hot. Terminals 83 of the fan circuit are preferably connected directly to the service lines, the valve and control terminals 16 and TI usually being connected to a low-voltage supply to minimize the hazard in the thermostat circuit. In Fig. 8, a damper 38 is shown connected for operation by rod @3. Such a damper may, for example, conveniently be employed to control the supply of auxiliary air to the furnace and is opened concurrently with the opening of the fuel valve.

The two-way snap-action time-delay system described is also adapted for use in connection with the control of fluid-pressure operated systems, a let and closure member therefor then being substituted for the contact elements. It

will be noted that the energy for efiecting snap I action of the control arm is stored up in that arm, and hence its movement is independent of the rate of movement of the bimetallic member.

While I have herein shown and described a specific embodiment of my invention, I wish it to be understood that modifications may he made without departing from the spirit of the invention, and that i intend therefore to be limited only by the scope of the appended claims.

I claim as my invention:

1. in an alternating current solenoid: a sleeve member, a plunger reciprocaole in said sleeve and so clearanced therefrom that it can tilt to a limited degree, a load for said plunger, an energiaing coil fo causing the plunger to move inwardly of the sleeve to operate said load, and stop means limiting said inward movement of the plunger, said stop means and said plunger cooperating to provide a Pivot point substantially on the axis of the sleeve about which point the plunger can tilt when its movement is so limited, the reaction of said load on the plunger being such that when the plunger is in said limited position there is a, preponderant force urging it to tilt about said pivot point into one-sided engagement with the sleeve.

2. In an alternating current solenoid: a sleeve member, a plunger reoiprocable in said sleeve and so clearanced therefrom that it can tilt to a lim ited degree, a load for said plunger, a coil around said sleeve for attracting the plunger therewithin to operate said load, and stop means closing one end of said sleeve and engageable by said plunger in its inwardly-attracted movement, said stop means and said plunger cooperating to provide a pivot point substantially on the axis of the sleeve and about which the plunger can tilt when it is in fully attracted position, the reaction oi said load on the plunger being such as to cause it to tilt about said pivot point into engagement with the sleeve.

3. In an alternating current solenoid: asleeve member, a plunger reciprocalole in said sleeve and so clearanced therefrom that it can tilt to a limited degree, a coil around said sleeve for causing attraction of the plungerwithin the sleeve, stop means closing one end of said sleeve and engageable by one end of said plunger in the inwardly-attracted movement thereof, and a load operated by said plunger and connected to the essence opposite end thereof, said stop means and said plunger providing portions which interengage when the plunger is in fully attracted position and restrict the position of said one end of the plunger about a point on the axis of the sleeve, the reaction of said load on. said plunger being at an angle to the axis of the sleeve so that the plunger is tilted about said point and into engagement with the sleeve when in fully attracted position.

4. In an alternating current solenoid: a sleeve member, a plunger reciprocable in said sleeve and so clearanced therefrom that it can tilt to a limited degree, a coil around said sleeve for causing attraction of the plunger within the sleeve, stop means limiting said inward attraction of the plunger, said stop means and said plunger cooperating to provide a pivot point substantially on the axis of said sleeve about which point the plunger can tilt when in fully attracted position, and means so mounting said sleeve member that its axis is inclined from the vertical and the plunger is therefore tilted by gravity about said pivot point and into engagement with the sleeve when in fully attracted position.

Will-1AM A. RAY.

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