US2303128A - Gas burner control for domestic water heaters - Google Patents

Description

Nov. '24, 1942. E. R. KOPPEL 2,303,128

I GAS BURNER CONTROL FOR DOMESTIC WATER HEATERS Filed May 6, 1940 2 Sh eets-Sheet 1 Ernst RKoppeZ INVENTOR.

ATTORNEY.

Nov. 24,1942. R Kopp 2,303,128

' ens. BUfiNER-QONTRQL FOR DOMESTIC wmznnmgrsss FiI-ed May 6, 1940.. 2 sheets-sheet 2 Q 1 Pateted NotnZ 23 22 f I v I 2' I Q I Gss BURNER coN'rsoL ron DOMESTIC wuss HEATERS Application May 6, 1940, Serial No. 333,814

b 3 Claims. (01.236-21) This invention relates to gas burner control for In the drawings:

. ENT oFFlcE v domestic water heaters. Figure l is a sectional view of the lower end 01" In the construction of domestic water heating a tank Showin h control and thermflstfltl units, it is customary to employ a cylindrical pp thereto; tank disposed with its axis vertical and having a, F18. 2 is a horizontal section taken on line 2-2 substantial thickness of insulation around its 0! F18- 1;

sides and over the top, with a thin sheet metal at 8 is a vertical section taken on line of casing the outside- A as burner is normally Fig. 2: 1

placed beneath the tank, inside of the casing, i 4 is a vertical section taken nl ne 4-4 1" i and a chimney flue is provided upwardly through E- I V i the center of the tank. 7 Fix. 5 is a detail section showing the by-pess The gas burner has a. pilot-flame and a main for the D r. 01! li i 0 P18. 4; d

burner flame, the former operating continuously 8- 6 i8 8 fron View of h 038111! s l' and the latter operating intermitt t in control-in place.

- cordanc with th demand for t, waten Here. Referring to the drawings, the water tank I has tofore, the control of the main burner flame by an outer casing 2 spaced therefrom to provide'forf means of a thermostat has entailed equipment of heat insulation A 1' cover p e 4 18 a size requiring its location outside of the ing, located near the bottom of the casing I to. provide This meant that the supply pipe for t g m access to the burner I and to the control mecheapplied. to the main thermostat located part way 20 e gas supply Pin i n the control up the side of the casing and that two pipes went mechanism at the bOttOm 0f the mdown on the outside oi. the casing to the bottom The control mechanism has i lower u 1v where they nt r d t pfloi; control and the providing a gas chamber 8 receiving us directly burner. The unsightly appearanc of t equipfrom the supply pipe 8.1 A circular disk valve I ment and the danger of its being tampered with normally Pressed cloud on it! mt by e by' small childr n h b recognized for some spring H in the gas chamber 8, and closes oil time and attempts have been mad t Mn the gas from the burner. when the disk valve I control thatocan be placed entirely i i t is pressed downwardlyagainst spring II it opens casing, out of sight. This, with the existing 1 and allows gas to escape from chamber 8 past controls could only be achieved by the addition of 0 seat It into the upper chamber l2 and through another merely ornamental housing around the the passage directly the heater proper.

The object of the present invention is to progg gi fi fif 'gv fifii; vide a control for the use burner which is'small supp c 85 operated valve l6 controlling the passase of gee a d compact and wh h l q and we .throuehportn totlle pilot burner u. 1 The main valve 0 is controlled by two thermo- An o i is t provide a single valve stats I. and a. The thermostat ll extends into whichisoperatedbybothapilotthermostatand thewaterspaceinthe tankand respondstothe amsln control thermostat. 40 temperature ,0! the water in the tank to open or Moth" iectistoprovide a controlto which close the valve I. The thermostat 20 extends the as supply pipe is connected through the ebovethepilotilame andisresponsivetoits tembottom oi' the casing and in which no part experature to provide 'the safety feature of preventtends outside of the tonin in: opening of valve I should the pilot time be- Another object to provide my control come extinguished. Iioch thermostat preferably mechanism which is readily ldiueted and which wmpm homnmly copper u and on inner control rod 2! ol diflerent cohssaveryshortpethl'orthegesrromthevalve j meant I and limtbovmbemd to an mt mp mt mm secured to the end subjected to heat changes.

Wt 9 w The other end of the tube is and while the eon- Other objects will be made'clear in connection 235?; the gig with h descrip ion f one em dim n t The upper thermostat is h'asltsbese a secured inventlonfll st utedintheaccomr ri ed w intliewau tthetenkendaohann luextende lugs. -g66dcwnnrdlyirombueltonthcoutsideo! Thecasting'lhasasmallelllendinz the tank to hold the casting 1 at a substantially fixed distance from the thermostat, A bell crank lever 25 is horiziontally pivoted at the upper end of channel 24 and has its vertical face engaged by the end of the rod 22 of the thermostat I9 while its horizontal face rests upon the upper end of a vertical push rod 26 extending downwardly inside the channel.

. The push rod 26 is made in two sections joined by a coupling 21 threaded to the two ends in opposite directions to provide for adjusting the over-all length of the rod. The lower end of therod 26 passes through the top of casting I and engages a triangularly shaped ledge 28 which is pivoted to a short stub vertical push rod 2!.

Normally the ledge 28 is held against pivoting on the rod 29 so that when rod 28 presses downwardly upon the ledge it moves the rod 28 down wardly. The rod 2! rests upon the center of a disk 30 which in turn contacts the rim of a con-.

I disk again seats. Spring tends to support the weight of disk 9 and hold it against the seat.

In operation, when the water in tank I cools, the tube 2| of thermostat I! contracts and causes its rod 22 to move outwardly against the bell crank lever 25. This forces push rod 26 downwardly against ledge 28, thereby pressing rod 29 downwardly against disk 30 which in turn snaps spring 2| past center, opening valve 9 and releasing the gas to the burner. Likewise, when the water in tank I becomes heated, tube 2| of thermostat l9 expands'and withdraws rod 22 inwardly allowing the bell crank lever 25 to pivot away i from rod 28. Spring 3| then snaps over center 26. and effects and lifts rod 29, ledge'28 and rod seating of the valve disk 9.

In order to provide the safety feature of preventing the valve I from being actuated to open position by thermostat it in case the pilot flame becomes extinguished, the ledge 22 has its vertical face engage one end of a lever 22 which is pressed against-it by a spring 24 to hold the ledge in normal position. The other end of.lever 23 is engaged by the control rod 22 of thermostat 2|.

. When the thermostat is cold, as when the pilot is extinguished its tube 2| contracts and the consequent outward movement of rod 22 operates lever 32 against spring ll and away from the ledge 2| having a cylindrical tank disposed with its axis I vertical, a heating burner beneath said tank, a layer of heat insulation around the tank, a cylindrical casing enclosing the insulation and tank and substantially concentric with the tank to' so as to give the latter no support. Thereafter,

when thermostat ll calls for heat and rod 2! lowers, the ledge 28 merely drops away from the rod and does not eflect a push-on rod 22.

Upon lighting of the pilot burner again thermostat 2| will become heated and allow spring 34 to press lever 23 back to normal position holding ledge 22 in a non-pivotal relation.

The entire control mechanism takes up little space and can be placed wholly inside the casing 'ofthetank. Itisreadilyadiustedbymeanso! the coupling 21 on rod 26 andlis simple'to main- .tain. n. desired the manually controlledpilot valve it may be additions-l1! shut oil by therprovide for a uniform thickness of insulation with a minimum of space between the casing and tank. gas control devices disposed entirely inside said casing and comprising a casting providing a main valve chamber having a connection for the gas supply pipe and a connection for the burner with a snap action valve disposed therebetween, a pilot burner secured to said casting and extending to casing.

2. In combination in a domestic water heater having a cylindrical tank disposed with its axis vertical, a heating burner beneath said tank, a layer of heat insulation around the tank, a cylindrical casing enclosing the insulation and tank and substantially concentric with the tank to provide for a uniform thickness'of insulation with v a minimum of space between the casing and tank,

gas control. devices disposed entirely inside said casing and comprising a c valve chamber having a connection for-the gas supply pipe and a connection for the burner with a snap action valve disposed therebetween, a pilot burner secured to said casting and extending to a point relative to the main burner to efl'ect lighting of the latter, a thermostat responsive to the temperature of the water inside the tank to operate said valve, said thermostat being disposed above said valve and extending horizontally through the wall of the tank and being connected with said valve by a vertically reciprocating push'rod disposed within the space provided for insulation between the tank and outer cylindrical casingfand a thermostat responsive to a temperature produced by the pilot flame, and meanstodisconnectsaidpushrodtopreventthe opening oi' the valve by it when said second thermostat moves to a position responsive to failure of the pilot.

3. In a gas burner control, a thermostat, a rod disposed to be moved longitudinally by the thermostat against a bell crank lever pivoted to a conditions.

mar R. KOPPIL.

ing providing a main

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