US1314254A - Motor fob dampebxreo-trlators - Google Patents

Description

M. W. EASTMAN.

MOTOR FOR DAMPER REGULATORS.

APPLICATION FILED OCT. 1. m1.

1,314,254. Patented Aug. 26, 1919.

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M. W. EASTMAN. MOTOR FOR DAMPER REGULATORS. APPLICATION FILED OCT. 1. 19!?- 1,314,254. Patented Au 26, 1919.

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MERLE WOOD'WABD EASTMAN, 0F CAMBRIDGE, MASSACHUSETTS.

MOTOR FOR DAMIER-REGULATORS.

Specification of Letters Patent.

Patented Aug. 26, 1919.

Application filed October 1, 1917. Serial No. 194,232.

To all whom it ma concern:

Be it known t at I, MERLE WOODWARD EASTMAN, a citizen of the United States, residing at Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Motors. for DampereRegulators, of which the following is a specification.

My invention relates to motors for damper regulators for automatically operating. the flue dampers to control the boiler pressure.

The object of my invention is to provide a damper regulator for steam boilers which will control the damper .by the boiler pressure in such a manner that the damper will be moved by successive stages with a well defined period of rest between the various stages, and thereby maintain a more nearly uniform furnace temperature. To accomplish these results, I have produced a machine having a weighted motor, the piston of which is operated on its upward stroke, by the accumulation of water pressure, the motor having multiple valves operated by the boiler pressure for venting the cylinder at various stages, and thereby retarding the movement of the piston.

Sheet (1) Figure (1) shows a vertical section of the water motor and diaphragm chamber. Fig. (2) shows an exterior view of the water motor. Sheet (2) Fig. (3) shows a sectional view of one of the exhaust valves. Fig. (4) shows a cross section through all of the exhaust valves. Like numerals refer to like parts in the several figures.

Referring to Sheet (1) Fig. (1), (1 is the diaphragm chamber, (2) is a tapped ole for pipe connections tothe boiler pressure, (3) is the pressure cap which conveys the force of the boiler pressure to scale beam (4:), (5) is Weights for counteracting the boiler pressure, (6) is a connecting rod which 0 crates bell crank (7) for opening and closing the exhaust valves (8), (9) is a connection to water or other fiuid under pressure. This connection is provided with a small needle valve, not shown, for limiting the flow of water, to an amount less than can be dissipated by any one of exhaust valves (8), (19), (20) or (21).- (10) is a piston which operates in cylinder (11). (12) is counter-weights for operating the motor on the downward stroke. (13) is a chain or cord connection running over of the exhaust valves bein sheaves or pulleys (14) and (15), to damper arm (16). (17) is a damper weight for closing damper (18). plpe connections for conveying the waste water from the exhaust chamber to the sewer, hot well, or other draining apparatus; the exhaust. pipe being connected at the (23) and (24) are i end most convenient, the opposite end of chamber being plugged.

Referring to Sheet (2) Fig. (4), (22) is springs for normally holding the exhaust valves closed.

The operation of the machine is as follows: Normally bell crank (7) is pressed against the ends of valve stem (8), (19) (20) and (21), compressing spring (22) and holding the exhaust valves open. The pressure being admitted at (9). through needle valve, not shown, is dissipated by being exhausted through exhaust valve (19) to the atmosphere. Whenever the boiler pressure exceeds weights (5 scale beam (4) will be raised oscillating ell crank (7), thereby allowing exhaust valve (19) to be closed by spring (22). This operation permits the accumulation of pressure under piston (10),

which travels upward until the pressure is again dissipate through connection (25) Fig. (2) and exhaust valve (20). As the boiler pressure further increases valve (20) will be released from engagement with bell crank (7 allowing spring to close valve (20), and the piston will travel to a point in the motor cylinder (26), where a similar period of rest will take place, and so on as the boiler pressure increases and each successive exhaust valve is closed, until the piston (10) has made a complete stroke of cylinder (11) and closed damper (18). Con-- nection (28) is an overflow from the top of motor cylinder to prevent the accumulation of water above piston (10). As the boiler pressure decreases the bell crank will first open exhaust valve (8), when the motor will travel on a downward stroke by the force of counter-weights (12), until it has reached a point opposite connection (27), and as the boiler pressure continues to decrease the valves will be opened in the following order. First (8), second (21), third (20), fourth (19), at which time the motor plston has returned to its startir iglpoint and the damper is entirely open. is independent action controlled by the varying lengths of the ex aust valve stems,

which is successively engaged anddisenga ed by the-bell crank.

n practice the machine seldom, 1f ever, makes a complete stroke of the motor, but will be held at a point in its travel, WhlCll will give the necessary draft to burn the fuel und r the boiler, and maintain the desired steam pressure.

As each exhaust valve spring is released or compressed, a change in force takes lace which is equivalent to adding .or ta 1ng weights from scale beam- (4:) which requlred a further increase or decrease of pressure as the case may be, before the piston can travel to the next succeedin stage. This results 1n a well defined period of rest at each stage of the travel of the motor. I Y

I .am wellaware of the fact that damper regulators for controlling boiler pressure have been used having cut-Iofi attachment 'desi ned to hold the piston at a partial stro e, but such arrangement usually consists in compensating the movement of a single actuating valve having admission and exhaust ports,-and as such valves are liable to stick, the cut-off attachment ismade ineflt'ective resulting in a complete stroke of the piston. Even when the cut- I ployed.

ofl' attachment is most effective, the tendency of such machines, due to the necessary friction of a closely fitted plston valve, 1s

to travel past the point where it should stop, resulting in too great a variation in the furnace temperature, for economy.

My invention provides for a positive graduated movement of the piston, the number of stages of its travel being only limited to the number of exhaust valves em- The period of rest between the various stages of the travel of the piston may be made more or less to suit the conditionsby adjusting the tension of the spring which holds the exhaust-valve closed.

While the specifications describe my invention in connection with-the operation of dampers for controlling thejboiler pressure, I do not wish to limit the scope of the invention to this particular field, as it may be successfully applied to controlling ba anced lever valves, for supplying steam to' blower engines or turbine blowers, or exhaust fans, as used in connection with forced or induced draft; or it may be applied .to the control of balanced lever valves for reducing steam pressure from a high initial to a lower reduced pressure. I therefore wish to. claim my invention broadly for any use for which it may be applicable.

Having fully described my invention, what of one another,

' I claim as newand desire to protect by Letsaid piston being operated by.

ple exhaust valves designed to be opened independent of one another, forventing the cyllnderat various points, and means for closing sald exhaust valves, to cause the piston to travel in successive stages with.

a well defined stage. I

3. The combination of a motor cylinder and piston, said piston being operated by accumulative pressure, and having-multiple exhaust valves actuated independently means for so actuating said period of rest betweeneach valves, comprising a weighted device for venting the cylinder at various points to cause the piston to travel in successive stages with a well defined period of rest between each stage.

4. The combination of'a motor cylinder and piston, said piston being operated by accumulative pressure, and having multiple exhaust valves arranged to be opened independently of one another, means for so actuating said valves, comprising aweighted device for venting the cylinder at various points, and springs for closin said"- valve, to cause the piston to travel in successive stages with a well defined period of rest between each stage.

5. The combination of .'a motor cylinder and piston, said piston being operated by accumulative pressure, ple exhaust valves held to their seats by springs, and with stems of arranged to be opened and closed independently of one another, means for so actuating and having multi-' varying lengths said valves, comprising a weighted device In testimony whereof I have aflixed signature in presence of two witnesses.

MERLE WOODWARD EASTMAN.

Witnesses CHARLES BRITTON KIJNGEMANN, GEORGE "MCANAUL,

with a well defined period of rest

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