US1264313A

US1264313A - Controller.

Info

Publication number: US1264313A
Application number: US4809015A
Authority: US
Inventors: Jerome E Lynch
Original assignee: JAMES W WOODWARD; Lynch & Woodward
Current assignee: JAMES W WOODWARD; Lynch & Woodward
Priority date: 1915-08-30
Filing date: 1915-08-30
Publication date: 1918-04-30
Anticipated expiration: 1935-04-30

Description

1. E. LYNCH.

CONTROLLER.

APPLICATION FILED AUG.30. 1915,

4Lua'tented Apr. 30, 1918.

ZU/N/esses/ T@ PATE@ FFM. i

JEROME E. LYNCH, 0F BOSTON, MASSACHUSETTS, ASSIGNOR TO LYNCH & WOODWRD,

OF BOSTON, MASSACHUSETTS, A PARTNERSHI? COMPOSED 0Fv JEROME E. `:LYNCH AND JAMES W. WOODWARD.

rennais. i

y the following is a'speciiication.

This invention relates to improvements in controllers particularly though not exclusively adapted for controlling and operating dampers, valves and like devices.

The object of the invention is to providek a simple,.sensitive and accurate controller constructed and arranged to be operated by the application of a predetermined pressure of vapor to open or close dampers, valves and the like.

rlhe invention consists in the combination and arrangement of parts set forth in the foll lowing specification and particularly pointed out in the claims.

Referring to the drawings:

Figure l is a vertical section, partly in elevation, of a controller embodying my invention, the same being operatively connected with la damper as illustrative of one specic adaptation of the device. p

`llfig. 2 is a transverse section taken on the line 2-`-2 of Fig. 1.

Like numerals referto like parts in both views ofthe drawings;

ln the drawings, 5 is a casing which preferably consists of an outer cylindrical portion 6 and an inner cylindrical portion 7. The upper ends 8 and 9 of said outer and inner portions respectively are closed, while the lower ends 10 and 11 of said casing members respectively are each provided with an .annular flange 12 to which a ring 18 is secured,V preferably by bolts 111.

Theportion 7 of said casing is substantially shorter and smaller in diameter than the portion 6, thus providing an annular chamber 15 between the sidewalls of said casing portions and also a chamber 16 between the closed ends 8 and 9 of said casing portions. The

chambers

15 and 16 constitute a float chamber within which is arranged a iioat 17, preferably cylindrical in sha-pe and closed at its upper end 18, while the lower end 19 of said fioat is open.

The casing 5 is adapted to contain liquid,

the normal level of which is slightly below the upper closed end 9 of the inner portion 7 of said casing as indicated by the line A,

Specification of Letters Patent.

CONTROLLER.

Application filed August 30, 1915. Serial No. 48,090.

saidilevel being maintained by an overflow pipe 20. The "liquid indicated at A substantially fills the chamber 15, while the chamber 16 is adapted to contain steam or other vapor which are admitted thereto" under pressure through a vapor inlet-pipe 21 connected with the casing adjacent tothe upper wall 8 of the outer portion thereof.

lThe inlet pipe 21 is preferably connected with a vapor supply pipe 22 which leads from any suitable source of supply.` This supply aipe is also connected to the overflow pipe 20 y means of a check valve 23, which prevents the vapor supplied through the supply pipe 22 frompassing directly into the casing 5 on the level of the liquid ".A contained therein, but causessaid vapor to pass upwardly tothefluid inlet pipe 21. Saidcheck valve is however arranged to be opened by the pressure of water or liquid upon the inside of said casing when said liquid reaches the level of said valve, thus permitting the same to return to the boiler or othen source from whence the vapor is sup-` Ip 1e i y rllhe ioat 17 `is arranged to move vertically preferably midway between the outer and inner portions 6 and 7 of said casing inwhich position said float is preferably guided by means ofva` rod 24 secured to the end 18 of said float andpassing downwardly therefrom through an opening25 in the wall 9 of the inner portion of the casing 6. The lower end of the rod 21 is still further guided and controlled in its vertical reciprocations preferably by a cross frame 26 secured withinv the inner portion-7. An .eye 27 is preferably formed at the lower-end of the rod 24C and upon a bracket 32 secured to the ring 13. The outer end' 33 of said lever 8O is operatively connected in any suitable manner, preferably by a chain 3st extending over suitable pulleys 3,5, in the. present instance with a damper 36 shown somewhat diagrammatical and whereby the movements of said fioat vertically will cause Ysaid damper to be opened or closed,`as desired, to regulate the draft of a boiler.

A counter weight 37 is mounted preferably upon the outerarm of the lever 30 and is adjustable thereon so as to vary the weight that must be lifted by the pressure ofvapor upon the float 17 before said oat can be operated to move theV damper connected with y said lever. The interior 38 of the float 17 above the level of the liquid A is adapted to contain air which is admitted thereto through the opening 25 in the stationary part ot said casing, said opening being slightly larger in diameter than the rod 24. Means carried partly by the movable member or float 17 and in part mounted upon the stationary portion 17 of the casing are adapted to close the opening 25 when the float 17 is depressed a predetermined amount in order to prevent the liquid in said casing from being discharged through said opening after said float has reached the limit of its downward nuoven ment.

The means just described consist of a valve 39 preferably adjustably secured to the float 17 while a valve seat 4() secured vto the stationary portion `7 is adapted to cooperate with said valve to perform the functions hereinbefore rei'erred to. To adjust the device so that it will operate at varying pressures vto close the opening 25 the weight 37 may be vmoved toward or away from the pivot 31 of the lever 30 and thereby increase or diminish :the weight to be lifted thereby.

The lweight 37 cooperates with the resistance ofthevair from the chamber 38 in said float as it escapesv through the opening 25 to check themovements of said'tloat. The size ofthe openingf25 isk also adapted to be made largeror smaller, as desired, to increase or diminish the amount of air which is permitted to escape through said opening wherebythe movements ot said ioat will be correspondingly increased or diminished.

Thel means for varying the size of j the opening and the ,amount of air which is permitted to pass through said opening preferably consists of a bushing 41 which is secure'd in the upper wall 9 of the interior portion of said casing. They bushing 41 has a flange 42 which rests upon the upper surface vot the wall 9, while secured to said ange is the seat 40 `for the valve 39. The bushing 41 extends through said vpartition 9 and is held stationary therein by screw-threads 43 upon the outer surface of the portion ot said, bushing extending` through said partition. Said bushing also extends a substantial distance below the portion 9.and is engaged by an adjustable screw-threaded cap 44y having a central hole 45 constituting a guide for the rod V24 of saidI float. A plurality of slots 46 are arranged about the bushing 41 and adapted to be opened or closed by the movement of the cap 44 longitudinally of said bushing. The cap 44 is readilyadjustable fromvbeneath the device, permitting the same tov be rotated at any time to vary the checking power of said air cushion.

The operation of the device is as follows:

The damper 36 may be set so that there controlled thereby will produce a prede termined pressure or steam. Should the load for which the damper is adjusted be suddenly decreased the pressure oi2 steam in the boiler will naturally7 be increased and this increase will be transmitted to the chamber 16 against the tloat 17 causing said iioat to be depressed. The depression of the float 17 operates through the rod 24 and link28 to rock the lever 30 upon its pivot 31 in opposition to the force exerted by the weight 37, thereby causing the damper 36 to close so as to check the draft' of the furnace.

Should the pressure within the chamber 16 be reduced by the condensation of the steam therein or for any other reason the lioat 17 will be moved upwardly by the weight 37 and in consequence the damper 36 will be opened so as to increase the draft.

The downward movement ot the tioat 17 will be retarded by the air within said iioat, which is permitted to escape, but slowly, through the passages 46, which passages may be enlarged or decreased as desired by adjusting the collar 44.

Should the pressure of the vapor within the chamber 16 continue long enough to cause the float to descend a. predetermined distance, this distance being governed bythe position of the valve 39 and the rod 24, said valve will engage the seat 42 and thus close the passages 46, preventingvthe escape ot the liquid in the casing 5.

It will thus be obvious that any sudden increase inthe' pressure of vapor entering the chamber 16 will be prevented trom suddenly depressing the float 17, but instead the movements thereof will be checked by the action of the air within said float which must gradually escapebefore saidiioat will be permitted to descend. The movement'of the damper 36 will, therefore, be yvery slow and gradual rather than sudden. The movement of the lioat in the oppositie direction will also be gradual for like reasons.

Having thus described my invention what I claim and desire by Letters Patent to secure is:

1. A controller having, in combination, a float provided with an air chamber, a casing for said float constructed and arranged to contain liquid, said liquid constituting a seal for the air within said air chamber, an air valve communicating with the air chamber in said float, a vapor inlet for said easing adapted to direct vapor into said casing` against said iioat to expel the air from said air chamber through said air valve and means constructed and arranged to adjust said air valve to increase or diminish the amount of air passing through said valve and thereby increase yor diminish the resistk ancelto themovement of said float.

2. AVcontrollerhaving, in combination, a float provided with an air chamber, a easing for said'float constructed and arranged to contain liquid, said liquid constituting a seal for the air Within said air chamber, an air Valve communicating With said chamber, a vapor inlet for said casing adapted to direct vapor against said float to expel the air from said air chamber through said air Valve, and means constructed and arranged to vary the opening of said air valve Whereby the resistance to the movements of said 10 float may be increased or diminished.

In testimony whereof I have hereunto set my hand in presence of two subscribing Wlt- Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, JD. C.