US2262681A

US2262681A - Automatic air valve for stokers

Info

Publication number: US2262681A
Authority: US
Inventors: Huber Michael
Original assignee: LAWRENCE R SCHMIEDER
Current assignee: LAWRENCE R SCHMIEDER
Priority date: 1939-12-19
Filing date: 1939-12-19
Publication date: 1941-11-11
Anticipated expiration: 1958-11-11

Description

Nov. 11, 1941. M. HUBER 2,262,631

AUTOMATIC AIR VALVE FOR STOKERS Filed D90. '19, 1939 3 Sheets-Sheet ,1

I Invento;

M/CHAEL HUBER,

A itomey;

M. HUBER AUTOMATIC AIR VALVE FOR STOKERS Nov. 11, 1941.

Filed Dec. 19, 1939 3 Sheets-Sheet 2 A itorneys Nov. 11, 1941. M. HUBER AUTOMATIC AIR VALVE FOR STOKERS' Filed Dec. 19, 1939 3 Sheets-Sheet 3 a i i J a 7 I W w m? pfiw 7 3 Z 9 G 4 721 8 M my 2 A M M K I L i W. iij/iix v. 5% ;3 3; Em: K% ZZEZZ Z sq R. M R 3 Mia MY WwV Inventor M/CH/IEL HUBER,

A iiomeys Patented Nov. 11, 1941 AUTOMATIC AIR VALVE FOR STOKERS Michael Huber, Cincinnati, Ohio, assignor of onehalf to Lawrence R. Schmieder, Cincinnati,

Ohio

Application December 19, 1939, Serial No.310,054

7 Claims.

This invention relates to an automatic air valve for stokers, and has for the primary object the provision of a durable, dependable and controllable device of the above stated character which may be readily adapted to most any type of stoker now in use for regulating the amount of air necessary for a complete and steady combustion of any kind of solid fuel and which will automatically close and thereby shut ofi draft to the furnace during idle periods of the blower of the stoker, and which may be easily adjusted to vary the amount of air the blower is allowed to expel as forced draft for the fuel and may be easily adjusted to permit the blower to receive a full amount of air at any time it is deemed necessary to have a full amount of forced draft to the burning fuel.

With these and other objects in view, the invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described an claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawings, in which Figure l is a front elevation illustrating an automatic air valve and showing the latter applied to a fragmentary portion of a stoker.

Figure 2 is a top plan view illustrating the same.

Figure 3 is a sectional view taken on the line 3-3 of Figure 1.

Figure 4 is an enlarged fragmentary longitudinal sectional viewillustrating the automatic means for closing the valve and the adjustment of said means.

Figure 5 is a sectional view taken on the line 55 of Figure 4.

Figure 6 is a sectional view taken on the line 6--6 of Figure 4.

Figure 7 is a view similar to Figure 4 illustrating a modification of this invention.

Figure 8 is a sectional view taken on the line 8-8 of Figure 7.

Figure 9 is a sectional view taken on the line 9--9 of Figure 7.

Referring in detail to the drawings, the numeral 5 indicates a fragmentary portion of a stoker in which is employed the usual blower (not shown). The housing for the blower is indicated generally by the character 6 and the air opening for the blower in the housing is indicated by the character 8. The present invention is so constructed that it may be readily adapted to the housing over the air opening 8 for the purpose of controlling the amount of air to the blower and for automatically closing the opening 8 when the blower ceases to operate. It is to be understood that the present invention is opened under the suction of the blower and is self-closing whenever the operation of the blower of the stoker is stopped which will close natural draft to the furnace with which the stoker is employed.

A valve housing 9 consisting of an annular body I!) is provided atone end with an attaching flange H provided with openings to receive stud bolts or like fasteners for rigidly mounting the valve housing onto the housing 6 of the stoker 5. It is preferable that the flange ll be constructed of large size which will permit the flange to be adapted to various stoker housings in which the draft openings thereof vary as to size, it being understood that when the flange H has been adjusted or secured on a stoker housing the surplus portions of the flange may be readily sawed off to give a neat and attractive appearance to the device, as shown at I2.

Attaching lugs 13 are formed integrally with the body l0 adjacent the end thereof opposite to the flange H and are located on the interior of the body and are provided with screw threaded openings to receive bolts I4 having finger pieces IE to facilitate the rotation of the bolts. The bolts are employed for detachably securing on the latter-named end of the body an end plate I6 having a centrally arranged opening ll aligning with the draft opening 8. The bolts l4 extend through openings provided in the end plate Hi.

It is to be noted that the lugs l3 are oppositely arranged on the body consequently bringing about securing of the end plate on the body at opposite sides of the latter.

The end plate l6 about the opening I1 is extended inwardly in the direction of the body for the purpose of forming a valve seat I8 and coacting therewith is a valve element [9 including a disc-like portion 26 to engage with the seat for closing the opening H and a stem 2|. The end plate 16 further includes a supporting bar 22 which spans the opening I! and is provided with a screw threaded opening through which'the stem 2| passes freely. The disc 20 is detachably secured on the stem 2! by being positioned between a pair of clamping plates 23, one of which is slightly larger in diameter than the other and is provided with a recess 24 while the other is pro-t vided with a projection 25 which extends through an opening in the disc and has the stem 2| extending therethrough. A nut 26 is threaded on the stem and bears against one of the plates 23 the other of the plates being threaded on the stem iconsequently firmly anchoring the disc on the stem and providing a connection between these parts which will tend to prevent the disc from 3 buckling.

A bushing 21 is threaded in the opening of the j supporting bar 22 and includes a sleeve-like portion 28 provided with openings 29 to permit a spanner-type wrenchlto be applied thereto for threading the bushing into and out of the; opening of th 'bar 22. "The bushing 21 has threaded therein a neck portion 30 of a sleeve 3|, the

latter being of an increased diameter over theneck portion. The sleeve 3i is eigter nally screw; 3 threaded and has threaded thereon a stop sleeve 1 32, one end of which is notched, as shown' at 33, j to receive a spanner wrench for the' adjustmentof the stop sleeve on the sleeve 31.

sleeve 34 is arranged Within the sleeve 3| andv spaced from the major portion thereof and is threaded into the neck 30 of the sleeve 3| and 1 acts as a bearing for the slidable support of the stem 2l of th valve element [9. Thefree end of the sleeve 34 is notched, as at 35, to permit the application of a spanner wrench thereto. As the sleeve 34 forms a bearingfor the stem 2l it An inner by the operator as well as the distance it may 'move towards the seat under the influence of the spring permitting a very accurate adjustment of.

the valve to be had so as to efiiciently regulate the proper amount of air to the blower of the 'stoker to-assure proper combustion of the fuel.

A dust cap 41 is arranged over the various sleeves and, valve stem and has a frictional fit i is preferable that it be of the lubricatingtype, that is, treated with graphite or similar lubricant material so as ,to assure, free sliding movement 1 within the sleeve. 31. i has an end wall 38 provided with a threaded openj ing to thread onto the stem and which forms. a seat for, one end of a coil spring 39. The .coil 3 1 spring receives therein the'stemcand the sleeve 3 34and its opposite end is seated-on a flange on 1 the sleeve 34, which flange abuts the neck, of l the sleeve 3 I The spring is of the expansion type of the stem of thevalve under all conditions.

Theunattached end ofc the stem 2i is screw threaded, as shown at 36, to havethreaded thereon a sleeve, 31 which is arranged to telescope One end of the sleeve 31 and acts to seat the valve elementon the valve seatlB and by adjusting-thesleevefil on the stem the tension ,of the spring may be increased andjdecreased. as desired, Nuts 4.0 and 41 are threaded. on thestemwith the nut spaced stem.

The sleeve 3 2, as before stated, acts as a stop by being abutted by the nut lil for limiting the opening of the valve under the suction of the.

blower of the. stoker. By this arrangement it is possible to regulate the amount of air the blower' will receive through the opening .11 in the end plate I6 and consequently regulate the amount:

of air the stoker furnishes the burningifuelsr .A combined guide rod and indicator 43- is secured on the disc 20 and passes freely through an opening 44 in the supportingbar 22 and has threaded thereon a knurled stop 45 located between the disc 20 of the valve and the supporting bar 22-for the purpose of providing a means of varying the closing of the valve with relation to the seat. A scale 46 is provided on'the combined guide rod'and indicator 43 and when read in" conjunction with th bar 22 may indicate to the;

operator the distance the disc of the valve ele-' ment will be kept from the valve seat during non-' operation of the blower of the stoker. The mem ber 43 extending through the opening 44 besides performing thefunctions outlined also prevents the valve element from rotating during its movement towards and from the valve seat and con sequently obviates any possibility of 'the stem 45': from the end wall 38, of ,the sleeve 31-, the nut, 4| holding nut in adjusted position. on the.

with the flange 28 of the bushing 21 for the pur- "pos eof excluding dirt and other foreign matter from the mechanism confined 1 therein.

Referring to the modified form. of my invention it ls proposed to use in conjunction with the spring33 a magnetic means 48 for the seating of the valve element. ,In this form of the invention the dust cap 49 is slightly modified from the ,dus t cap 4'| and has arranged in its closed end a permanent magnet 50 and coacting therewith is a member 5! subject to attraction by the magnet and is threaded on the stem 36 in lieu of the nut 40., The attraction of the magnet 50 for themember 5 I will be fora limited dis tance theretromand by the arrangement as described and shown in Figure '7 this magnetic action will take place after thevalve has moved a limited distance towards a seated position so that a further movement of the valve element towards a seatedposition will be under the influence of the magnetic means, the spring 39 of .course acting to initially move the valveelement towards a seated position.

The arrangement shown in Figure 7 permits:

the useofaweaker spring than the type of device shownin ;the other form of my invention and theoperation of the blower of the stoker discontinues. In small size valves used on small size stokers, the spring 739, may be eliminated and rely on, closing of the valve by the magnetic means. U e

In making the adjustments on the valve'for the purpose "of, limiting the unseating of the .valve element-from the seat it is. preferable to so care rye out this. adjustment that the valve. element when unseated to its'limit of adjustment will admit' approximately eighty per cent of the entire amount of air to the blower that canbe admitted under the construction of this invention and the stoker. of air is desired, one of the bolts l4 maybe removed and the other bolt released so that the end plate I6 andthe valve carried thereby may be swung laterally of the valve casing and theree by admit the maximum amount of .air to the blower of the stoker. e e ..It is believedjthat. the, foregoing description, when taken in connection with the drawings will fully set forth the constructionand advantages of this inventionto those skilled in thev art. to

which such a device relates, soQthat further odetailed description will not be required.

, Having thus described the invention, what I claim is:

1. In adevice fer the class described a valvei housing, an end wall detachably connected to one will assure of a positive seating of the valve when If at any time the maximum amount end; of said housingand having an air inletiopen; ing; therein ,and a valve seat; 1surroundingthe.

opening, atvalvie element including a stem and coacting with; said seat and movable away from the seat by suction in theahousingeautomatic means coacting with the stem for working in oppositiontothe suction and acting to move the valve element towards the seat, a supporting bar spanning the air inlet opening and carried by the end wall, a bushing threaded in said supporting bar and having the stem extending freely therethrough, a bearing sleeve carried by said bushing and detachable therefrom and slidably supporting the stem, a second sleeve threaded on the stern and housing one end of an expansion type coil spring interposed between said bushing and the second-named sleeve and capable of having its tension varied by the adjustment of the second-named sleeve on the valve stem and adjustable means for limiting movement of the valve element toward opening and closing movements.

2. In a device of the class described, a valve housing having an air inlet opening therein, a supporting bar spanning the opening, a bushing threaded in said supporting bar, a valve element to coact with the seat and movable away from said seat by suction in the housing and including a stem freely received by said bushing, a bearing sleeve threaded in said bushing and slidably supporting the stem, a second sleeve threaded on the stem and housing one end of an expansion spring interposed between the second sleeve and the bushing for urging the valve element towards the seat in opposition to the suction, lock nuts on the valve stem, and a stop sleeve adjustably mounted on the bushing and coactive with one of the lock nuts in limiting the distance the valve element may move away from the seat.

3. In a device of the class described, a valve housing having an air inlet opening therein, a supporting bar spanning the opening, a valve seat surrounding the opening, abushing threaded in said supporting bar, a valve element to coact with the seat and movable away from said seat by suction in the housing and including a stem freely received by said bushing, a bearing sleeve threaded in said bushing and slidably supporting the stem, a second sleeve threaded on the stem, an expansion spring interposed between the sec ond sleeve and the bushing for urging the valve element towards the seat in opposition to the suction, lock nuts on the valve stem, a stop sleeve adjustably mounted on the bushing and coactive with one of the lock nuts in limiting the distance the valve element may move away from the seat the stop sleeve being telescoped by the second sleeve.

4. In a device of the class described, a valve housing having an air inlet opening therein, a valve seat surrounding the opening, a supporting bar spanning the opening, a bushing threaded in said supporting bar, a valve element to coact with the seat and movable away from said seat by suction in the housing and including a stem freely received by said bushing, a bearing sleeve threaded in said bushing and slidably supporting the stem, a second sleeve threaded on the stem, an expansion spring interposed between the second sleeve and the bushing for urging the valve element towards the seat in opposition to the suction, a stop member adjustably arranged on the valve stem, a stop sleeve adjustably mounted on the bushing and coactive with said stop memposition indicator and an adjustable stop means for variably limiting the distance of the movement of the valve element toward the seat. 5. In a device of the class described, a valve housing having an air inlet opening therein, a

valve seat surrounding the opening, a supporting bar spanning the opening, a bushing threaded in said supporting bar, a valve element to coact with the seat and movable away from said seat by suction in the housing and including a stem freely received by said bushing, a bearing sleeve threaded in said bushing and slidably supporting the stem, a second sleeve threaded on the stem and housing one end of an expansion spring interposed between the second sleeve and the bushing for urging the valve element towards the seat in opposition to the suction, lock nuts on the valve stem, a stop sleeve adjustably mounted on the bushing and coactive with one of the lock nuts in limiting the distance the valve element may move away from the seat, means carried by the valve element and coacting with the supporting member in preventing rotation of the valve element and providing a valve position bearing sleeve, second-named sleeve and stop' sleeve.

6. In a device of the class described, a valve housing having an air inlet opening therein, a valve seat surrounding the opening, a supporting bar spanning the opening, a bushing threaded in said supporting bar, a valve element to coact with the seat and movable away from said seat by suction in the housing and including a stem freely received by said bushing, a bearing sleeve threaded in said bushing and slidably supporting the stem, a second sleeve threaded on the stem and housing one end of an expansion spring interposed between the second sleeve and the bushing for urging the valve element towards the seat in opposition to the suction, lock nuts on the valve stem, a stop sleeve adjustably mounted on the bushing and coactive with one of the lock nuts in limiting the distance the valve element may move away from the seat, means carried by the valve element and coacting with the supporting member in preventing rotation of the valve element and providing a valve position indicator and an adjustable stop means for variably limiting the distance of the movement of the valve element toward the seat, a dust cap removably mounted on the bushing for encasing the major portion of the valve stem, bearing sleeve, second-named sleeve and stop sleeve, and a permanent magnet located in the dust cap for attracting one of the lock nuts thereto and thereby active to cooperate with the spring in moving the valve element towards a seated position.

7. In a device of the class described, a valve housing having an air inlet opening therein, a valve seat within the housing and surrounding the opening, a bar extending across the opening outwardly of the seat, an inwardly opening valve 2,262,681 which the graduated rod passes and an adjust-' able stopon the graduated rod between the valve member and the'cro'ss bar and. adapted. to engagethe cross bar to limit movement of the- 5 valve member towarcithe seat.

MICHAEL HUBER.