US1758147A - Walter m - Google Patents

Description

@70645: BY I May 13, 1930. wfMJcRoss 1,758,147

HEATING SYSTEM CONTROL Filed Jan. 5l, 1927 IN VEN TOR.

ciency or under optimum Patented May 13, 1930 UNITED vSTATES PATENT OFFICE WALTER M. CROSS, 0F KANSAS CITY, MISSOURI, ASSIGNOR TO CROSS COAL-O-MATIC COMPANY, 0F KANSAS CITY, MISSOURI, A CORPORATION 0F MISSOURI p HEATING-SYSTEM CONTROL Applicatin led Januaryv 31, 1927. Serial No. 164,953.

This invention relates to improvements in a heating system control and refers more particularly to a dual system of control; one phase of the heating system operating the fuel feed and force draft mechanism and depending upon its actuation by variations in the room temperature of the dwelling to be heated; the other control functioning the fuel feed and force draft by predetermined minimum temperatures either inthe furnace or combustion pot o1. the temperature of the water circulating through the boiler or hot water system.

The control is in connection with an automatic stoker and ace set-up which is op'- erated either at maximum conditions of elfi'- operating or combustion conditions on one hand and bank fire conditions of operation on the other. In brief the control is such that as normally operated the heat supplied to the dwelling will be dependent primarily upon the thermostatic control functioned yby the room temperature,

y while the secondary control, either in the combustlon pot or actuated by the temperature of the boiler `water will serve primarily to keep the fire alive or prevent'extinguishment when the system is not being drawn upon for heat to the dwelling.

This application is a continuation in so far as the control is concerned of my previous apphcations, Serial No. 44,604, filed July 18, and Serial No. 147,667, filed Nov. 11,

Fig: 1 of the drawing depicts ,a sectional slde view ofthe end feed Stoker showing the manner of installing the control in connection with a steam boiler setting.

Fig. 2 shows the electrical control system.

Referring to the a common type of furnace setting, in which are positioned the flue tubes 2, water being circulated around the flues in the boiler 3. The combustion space is shown at 4 in the lower part of which is a combustion pot 5, to wh feed hopper 6, through` the longitudinal passage 7, in which is positioned a screwconveyor 8. The screw conveyor is driven from a motor 9 upon whose shaft 10 is mounted a drawings, at 1 is shown ich is fed a coal or coal slack from theA worm 11 meshing with'the worm gear 12, which reciprocates a vertical connecting rod 13 which functions a pawl, not shown in the drawings, but which engages the ratchet wheel 14 mounted upon the shaft 8a, which is an elongationof the conveyor screw shaft. The sprocket V wheel and chain mechanism shown at 15 manipulates an automatic dump grate which forms no part of the present invention. On the shaft 10 is also mounted a blower fan 16 which drives air through the aperture 17 discharging it through the duct 18 into the bed of re contained in the combustion pot through tuyres 19.

operation the automatic Stoker is functioned in the same manner as any common under-feed combustion apparatus, the coal being transferred from the hopper by means of the conveyor screw through the passage 17 and into the bottom of the combustion pot where it forces its way upward into the burning zone, where it is consumed, the ashes overowing the mouthof the-combuss tion pot.

The control consists of a thermostat diagrammatically shown at 20,` which is conveniently positioned in the dwelling at a point where the temperature maintained will more or less control the temperature throughout the house, or, if desired, individual thermostats can be had in the` separate rooms of the dwelling and the mechanism complicated accordingly to supply heat at the point de'- sired. VFor the purpose of the present'invention a single thermostat will suflice. The thermostat operates in connection with the electrical cir cuit-which receives its power from the lines vice to a predetermined point will cause a completion of the circuit andjcontacting of the metal 22l with the contact point 23, a battery 24 being interposed in .the circuit.

With the completion of the circuit by the con- 21 and 22. Acooling of the thermostatic deand27. .Thus the power from the lines 21 and 22 is conducted through the lines 28 and 29 through the motor 9 and line 30. In this manner the motor is started and the combustion mechanism put in operation, the drive being transmitted to the screw conveyor and to the blower fan.

The operation as suggested is under maximum conditions, or the mechanism is completely stopped at which time the operation is substantially under bank fire conditions.

To supplement this control there is a fluid operated thermostat 31, positioned in the boiler, where it assumes the temperature of the water. The thermostat 31 is set at a predetermined temperature to actuate the diaphragm 32, and this in turn moves the contacting member 33 against or away\,from

the contacting point 34.' Assuming that thek operation when operated vby the thermostat .20. The operation of the thermostat 31, however, is supplementaryl to the thermostatic control 20 to prevent extinguishment of the lirein the furnace when heat is not required in the dwelling. Furthermore, the operation due to the actuation of the thermostat 31 will cause the mechanism to operate under optimum conditions. Thatis, the fuel will be supplied at the same rate and air 1n- ]'ected to the combustion pot to consume the fuel under the most eicient conditions, rather than producing a slow burning fire which is a normal'practice where suicient combustion is -necessary only to keep the fire from` being extinguished.

It is understood air supply rates are carefully figured to proe duce the optimum operating conditions when the control device actuates to start the automatic stoker. There is no'regulation of drafts as in the common type of furnace, making for operation under varying conditions, none of which are perha s economically proper and efficient for the fiiel which is being used. In the present showing the mechanism is described in connection with a steam boiler,

but it will be understood that the secondary `for when the control 31 may be positioned in the combustion space, as well as in the boiler, and the minimum temperature governed accordingly.

By this invention, then, economical conditions of thermostat 20 in the heated there is a complete stoppa e of the fuel feed mechanism and the force draft fan. This permits only the burning o f the residual fuel, which when consumed would allow the fire to be entirely extinguished, if it were not for the auxiliary control within the combustion pot, which functions when the furnace or' the water in the boiler is cooled to a predetermined ltemperature. This auxiliary control starting the'fuel feed and force draft again institutes maximum operation until the tmperature in the boiler is restored to above 100, or at any other predetermined temperature selected as the minimum temperature.

I claim as my invention:

1. A heating system comprising. a boiler and combustion pot, an automatic under feed Stoker for supplying fuel to said combustion pot, a dual thermostatic control mechanism adapted to operate the stoker, one thermostatic mechanism functioning by variations in the temperature of the interior of the dwelling and `the other by predetermined minimum temperature of the fluid temperature in the boiler, to prevent extinguishment of the fire underl low heat requirement conditions.

2. A force draft furnace for hot water or 4 steam heating systems having a power driven automatic under feed stoking element, adapted to be operated under optimum combustion conditions, a anismA adapted to operate the stoker, one thermostatic mechanism functioning by variations in the temperature of the interior of the dwelling and the other by predetermined Vminimum temperature of the boiler water to prevent extinguishment of there.

WALTER M. oRoss.

that the fuel supply and combustion areat all times enforced,l

room reaches ,a predetermined temperaturel in the combustion pot or the water dual thermostatic control mech-

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