US1598270A - Automatic damper regulator - Google Patents

Description

Aug., 3L w25; W'. D. DFQESKE AUTMTI C DAMPER REGULATOR Filed April 7. i923 2 iheeiiss-5i1ef l h i N W. D. DREISKE Aug. 3l 1926.

AUTOMATIC DAMPER REGULATOR Filed April 7, 1923 2 Sheets-Sheet 2 Cil Patented Aug. 31, 1926.

PATENT OFFICE.

WLLTAM D. DREISKE, OF OAK PARK, LLINOIS.

AUTOMATIC DAMPER REGULATOR.

Application led April 7, 1923.

This invention relates to damped regulators, and more particularly to regulators of that kind in which a compensating mechanism is provided whereby the damper, in the automatic control thereof, is not always either entirely closed or entirely open, but to the contrary is, by reason of the compensating mechanism, some times only partially open, thereby tending to maintain or ensure a proper air supply for the particular load under which the boiler may be operating at any particular time, instead of merely providing either the maximum or the minimum draft foi the fire in the furnace.

Generally stated, therefore, the object of the invention is to provide, in addition to the ordinary compensating mechanism, an auX- iliary compensating device which will still further govern the action of the steam pressure controlled damper regulator, thereby to ensure still more accurately the proper draft or air supply for any particular load under which the boiler may be operating and tending to ensure closer regulation of the temperaturey necessary for the boiler under all conditions of load, or under changing loads, as will hereinafter more fully appear.

It is also an object to provide certain details and features of construction and combinations tending to increase the general eiciency and the desirability of a damper regulator compensating mechanism of this particular character.

To these and other useful ends the invention consists in matters .hereinafter set forth and claimed, and shown in the accompanying drawings, in which Figure 1 is a side elevation of a Adamper regulator apparatus embodying the principles of the invention, showing the condition of the parts when the piston in the cyliuder is down.

Figure 2 is a simliar view, with the lower portion thereof broken away for convenience of illustration, showing the positions of the parts when the piston is in its raised position.

Figure 3 is a similar view showing the piston raised a distance from the position shown in Figure l.

Figure 4 is a horizontal section on line '-i--ll in Figure 2.

Figure 5 is an enlarged detail section on line 5-5 in Figure 2.

Figure 6 is an enlarged front View of the Serial No. 630,447.

auxiliary compensating device shown in said other views.

Figure 7 is a side elevation of the device shown in Figure 6.

Figure 8 is a diagram of the damper regulating aparatus, showing the same connected to the damper of a boiler furnace.

As thus illustrated, the invention comprises a cylinder 1 with a piston 2'therein, and with a lever 3 pivoted or fulcrumed at el; below the bottom of said cylinder. Said lever has a weight 5 which is adjustable thereon. Below said lever, and below said cylinder, is a diaphragm 6 provided with a knife edge 7 upon which said lever is supported. A closed compartment 8 is formed below said diaphragm, with a pipe 9 leading` thereto, so that pressure in said compartment 8 will raise the lever 3 in a manner that will be readily understood; whereas, with the cessation of pressure in the chamber 8, said lever 3 will move downward. Said piston is operated, preferably, by hydraulic pressure, and for this purpose a valve mechanism is provided' comprising a casii'xg` 10 having a spool-shaped valve 11 therein to control the ports 12 and 13 which are connected by pipes 14 and 15, respectively, with the lower and upper ends of the cylinder 1, in the manner shown. The spool-shaped valve 11 is connected by a rod 16 with the lever 17, which latter is fulcrumed at 18 on the bell crank lever 19, the latter being fulcrumed at 20 on a stationary portion of the cylinder structure. A rod 21 connects the liever 3 with the end of the lever 17, so that the latter is operated when the lever is moved up or down. A water pressure supply pipe 22 leads into the side of the valve casing 10, opposite the middle portion of the spool-shaped valve 11, so that'the inlet port 23 may be connected with either the port 12 or the port 13, by the space provided between the two ends of the valve. Exhaust pipes 24- and 25 lead from the ends ofthe valve casing, so that while hydraulic pressure is entering one end of the cylinder the water may be allowed to flow out of the other end thereof, in a manner that will be readily understood. Of course, any suitable fluid pressure may be employed for operating the piston 2 in the cylinder.

Now the ordinary compensating mechanism comprises a tapered bar 26 rigidly conlll) nected at its upper end by an arm 27 to the upper end portion of the piston rod 28 oit said piston. The bell crank 19 has a roller 29 which ordinarily engages the inclined edge 30 of the barBG, so that as this aar moves upward the tulcrum point 18 will move downward and vice versa when the bar moves downward the ulcrum point "LS will move upward, and this sort otI adjustment tends, to change the `manner in which the valve mechanism controls `the admission of tluid pressure to the cylinder to operate the piston. The bell crank 19, it will he seen. is subject to .pressure ot' a spring 31 which tends to press the roller 29 toward the bar 26, but which yields to permit tlieeompensating action explained.

vllowin accordance with the vinvention a short bar whiclris wedge shaped or` tapered troni its lower end to its upper end, asshown in Figures 6 `and 7, is employed, said bar 3Q thus termed. being interposed between' the roller 29 and the edge 30 ot the bai-..26 previously mentioned. The inclined edge 33 has a shoulder 311 above and a shoulder 35 lbelow to limitl the travel oil the roller 29 thereon. Hence, when the bar 26 moves upward the" friction carries the bar 32 upward until the roller 29 strikes the shoulder 35, and then the bar 25 slides upward in the groove 36 formed in baclt ot the bar l32, until the limit ot upward movement is reached. ln a similar manner, when the bar 25 moves downward, the bar 32 will move with it untilIl the shoulder 34 strikes the roller 29, when the bar 32 will then remain stationary and the bar 26 will slide downward. pThus, and whether the piston moves upward or downward, ithas, or may have, at first a maximum or accelerated control over thefulcruni point 18, until the limit of the movement ot' the bar 33 is reached,.and thereafter any further movement of the fulcrunipoint 18 will be slower, inasmuch as the angle ot the edge 30 is much less than the angle ot the edge 33, with the result that the damperv regulator will come closer to effecting such a control over the damper as will insure proper temperature ott the lire for any given load, than would be the case if the roller 29 were allowed to directly engage the edge 30 of the compensating bar 26, which latter slides up and down in the lined or .stationary vertical gulde 37 mounted on the sidev of the cylinder.

Of course, without the bar 2G, and without any compensating mechanism whatever, the damper would at all times be entirely open or completely closed ateachchange of steam 4Vpressure in the boiler. This would .rovide er: essive variation in the draft which would increase the consumption oi coal. il compensating attachment is theretore provided, which operates in the manner shown, causing the regulator to come to rest and remain so until a slight change in pressure occurs, and the operation is again repeated. In addition, as explained, the auxiliary compensating device 32 is employed, which insures 'further accuracy and a greater closeness ot regulation of the turnace damper 38 necessary to insure a proper air supply for whatever load the boiler may be operating under at any particular time. Vlt will be seen that, :tor the purpose of automatic control, said damper is connected by a chain or other flexible connection 39 with the upper end ot the piston rod 2S, so that the up and down movement ot this rod controls the damper in the desired manner. lt will be understood, furthermore, that this damper is in the stack l0 of the boiler furnace, rso that it controls the draft and `he air supply tor the furnace below the boiler. rihus said damper is subject to automatic control by the variation of the pressure in the boiler itself, communicated to the chamber 8 by the steam pipe 9 leading from the boiler. Ot course, any suitable iiuid pressure may be used, but the atomatic damper regulator is subject to con rol by the variation in pressure of the steam in the boiler.

ylfhue the main compensating` device 30 co-operates with the secondary or auxiliary compensating device 32, as explained, to automatically govern the action of the regulator, in the manner explained. One coinpen ating device,vtheretore, acts through the other to automatically control the regulator, or to govern the regulator, in accordance with variations in the boiler pressure, thereby to automatically control the damper or other iiistrumentalities, by the piston 2 or other actuator.

lllhat l claim as my invention is 1. ln an automatic damper regulator for boiler furnaces, subject to control by the variation. or the boiler pressure, the combination of a piston, a damper controlled by said piston, valve mechanism to control Huid pressure tol operate said piston, means controlled by the boiler pressure to control said valve mechanism, a main compensating device to govern the action ot said valve mechanism, and an auxiliary compensating` device acting conjointly with said main compensating device to control the action ot said damper regulator.

ri structure as specified in claim l, said .main compensating device comprising a relatively long tapered bar, a 'tulcrum member having engaging means, and said auxiliary .compensating device comprising a shorter bar inserted like a wedge between said iirst mentionedj bar andv said engaging means, said shorter bar having the greater angle.

KK `3. A structure as specified in claim 1, said main compensating device comprising a relatively long tapered bar, a tule-rum member provided with means tending to engage the angular edge of said bar, and said auxiliary compensating device comprising a sliding member interposed between said bar and said engaging means.

4L. A structure as specified in claim l, said main compensating device comprising a relatively long tapered bar, a ulcrum member having means to engage the angular edge ot said bar, said bar being movable up and down by the action ot said piston, and said auxiliary compensating device comprising a relatively short tapered bar inserted like a wedge between said relatively long bar and said engaging means, said relatively short bar having means to limit the up and down movement thereof, whereby the up and down movement of said auxiliary compensating` device is less than the up and down movement of said relatively long bar.

5. A structure as specified in claim l, said main compensating device comprising a movable member and instrumentalities subject to control by movement of said member to govern the action of said valve mechanism, and said auxiliary device comprising means interposed to change the eii'ect of the movement of said member, so that the main compensating device and the auxiliary compensating device co-operate to produce a result dilierent from that which the main compensating' device would be capable oitl producing alone.

G. ln a regulator, in combination with means to be controlled thereby, the combination oi a primary compensating device, and a secondary compensating device, each dependent on the other, the one device acting conjointly with and through the other device to automatically govern the action of said regulator, whereby to automatically regulate saio means to be controlled in the desired manner.

7. A structure as speciiied in claim 6, said primary compensating device comprising a vertically disposed bar having an inclined edge, and said secondary compensating device comprising a shorter bar sliding on said inclined edge, together with means to engage the secondary compensating device.

8. A structure as specilied in claim 6, said -primary compensating device comprising a member of suitable length, means whereby said member is movable endwise, and said secondary compensating device comprising a member' which is slidable upon and longitudinally of said other member', together with means having traveling engagement with one edge of said secondary compensating device.

9. A regulator and means controlled thereby, having primary and secondary compensating devices, acting conjointly and one through the other to automatically govern the action ot said regulator, whereby to govern said means to be controlled, substantially as described.

10. ln an automatic regulator for boiler furnaces, subject to control by the variation of the boiler pressure, the combination of an actuator, instrumentalities controlled by said actuator, mechanism to control said actuator, means controlled by the boiler pres'- sure to control said mechanism, a main compensating device to govern the action of said mechanism, and an auxiliary compensating device acting conjointly with said main compensating device to control the action of said regulator.

ll. A structure as specilied in claim l0, said main compensating device comprising a relatively long tapered bar, a fulcrum member having engaging means, and said auxiliary compensating device comprising a shorter bar inserted like a wedge between said first mentioned bar and said engaging means, said shorter bar having the greater angle.

l2. A structure as specified in claim l0, said main compensating device comprising a relatively long tapered bar, a ulcrum member provided with means tending to engage the angular edge ot said bar, and said auxiliary compensating device comprising a sliding member interposed between said bar and said engaging means.

13. A structure as specitied in claim 10, said main compensating device comprising a relatively long tapered bar, a fulcrum member having means to engage the angular edge of said bar, said bar being movable by the action of said actuator, ant said auxiliary compensating device comprising a relatively short tapered bar inserted like a wedge between said relatively long bar and said engaging means, said relatively short bar having means to limit the movement thereof, whereby the movement of said auxiliary compensating device is less than the movement of said relatively long bar.

lll. A structure as specified in claim 10, said main compensating device comprising a movable member and means subject to control by movement of said member to govern the action ot said mechanism, and said auxiliary device comprising means interposed to change the eliect oit the movement of said member, so that the main compensating device and the auxiliary compensating device co-operate to produce a result different from that which the main compensating device would be capable of producing alone.

TWILLIAM D. DREISKE.

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