US2192990A - Boiler control - Google Patents

Description

March 12, 1940. H s TURNER 2,192,990

BOILER CONTROL Original Filed June 24, 1956 V; t AJM, INVENTOR.

ATTORNEY.

Patented Mar. 12, 1940 PATENT OFFICE 2,192,990 y BoILEn CONTROL Hubert s. Turner, New' York, N. Y.v

Original application June 24, 1936, Serial No. 86,999. Divided and this application January 7, 1938, Serial No. 183,854

4 Claims.

My invention relates to improvements in heating systems wherein a boiler is employed for generating the heating medium such as steam, and more particularly has reference to and is illustrated in the accompanying drawing in its application to a steam boiler, the object being to prevent operation of the boiler without a predetermined level of water therein and this application is a division of my pending application S. N. 86,999 filed June 24, 1936 and now Patent No. 2,169,077. v

When an automatic heater is used, such as an oil fueled steam or hot water boiler, the water ,gauge is not always kept under observation the same as with manually fueled boilers, and many oil burners are not provided with cut-offs which automatically operate when the water becomes low. To overcome this, I have devised a control which will prevent operation of the boiler when a predetermined low water level is reached.

In the accompanying drawing I have illustrated a suitable form of apparatus in perspective embodying an application of my invention, parts being broken away. n

4| and 42 indio-ate two small bellowsY attached to a header 43 and frame 43 having pivot |61. Air outlet pipe 44 is connected with bellows 4l, and on each side of the header 43, extending parallel with bellows 4| and 42, is a bifurcated bar 46, 46 connected across at the right end by yoke 46 as shown. Between said bellows is coiled spring 41, 4adjustable by the nut 48, which threadably engages the bar 48' within tube 48 passing through chamber 43, and said bar 48 is attached to one end of said spring and the opposite end of said spring 4'! is secured to cable 5|. Nuts 49 control the movement of the roller 50 in the slots 59 in bar 46, 46', and the ilexible cord or chain 5|, passes over roller 5|) to its anchorage at 5| on the frame 43 as shown.

The water in the boiler also circulates in header 43, being supplied through tube 45 and bellows 42 which are below the water level in the boiler, and as the water in the boiler approaches low water level, the water in header 43 being parallel therewith and fed therefrom, and being relieved of the weight of some of the water in said header, is forced upwardly by the action of spring 4l pulling on cord 5|, passing over roller 50, and.`

anchored at 5|. Due to the leverage exerted by the projecting bar 46, 46', pivoted on stud |01, and corresponding stud on lthe other side, the header 43 rises, and the left end thereof comes in contact with the lower side of the horizontal arm 23 of angle 23, forcing the latter to the left,

tripping piece 20 normally resting on lug 22, shutting off the burner, themercury contact tube I9 falling and breaking the circuit to the oil burner motor cr other appliance.

'Ihis lifting of header 43 is exerted, regardless of possible steam pressure, as the force is transmitted to stud |04 and its companion on the other side regardless of the position of these studs in their slots. Whenever the piece 20 is tripped, the burner or other appliance is shut down and cannot again be started until piece 20 and angle 23 are reset by turning button 2`| clockwise which causes piece 2|) to ride upon the lug 22 of arm 23. This prevents another of the dangers found in ordinari boiler controls; namely, when a lowwater cut-ofi of the iloat valve type is used, and the water in the boiler reaches the cut-ofi point during operation of the burner, the returning condensation waterv in a steam system raises the water level sufliciently to raise the float, which starts the burner again, which is quickly stopped when the Ireturned water has again vaporized. These frequent stoppings and startings, when the water level is low, seriously overheat the boiler and can cause damage thereto. In my invention, not only is this prevented, but the burner cannot be restarted without rst bringing the boiler water up to its proper level, as the upraised header 43 prevents the upper varm 23 and its lug 22 from taking the normal position.

To cut o steam, upon its excessive rise of pressure, it expands bellows 4| andl 42, thereby forcing chamber 43 leftwardly upon its trunnions |64, along slots in the ends of bars 46, 46', until said chamber strikes button |66 on lever 2S, pivoted upon shaft 2l, thus again releasing member 26 from lug 22, allowing the mercury switch I9 to fall and again cut off the heating element.

Of course it will be understood that various modifications may be made in the construction and arrangement of parts without departing from horizontally in response to variation in steam pressure in said boiler and means for effecting vertical movement of said chamber in response to variation in Water level in said boiler.

3. A device of the character described comprising a substantially horizontal frame pivoted at one end, a chamber slidably connected to the other end of said frame for horizontal movement, means opposing movement of said chamber relative to said frame and tending to rotate said frame to move said chamber upwardly, and tubular expansible means for providing communication between said chamber and a boiler whereby said chamber moves horizontally in response to variation in steam pressure in said boiler and vertical- HUBERT S. TURNER.

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