US2541175A

US2541175A - Gas water heater

Info

Publication number: US2541175A
Application number: US692902A
Authority: US
Inventors: Clark M Osterheld
Original assignee: McGraw Electric Co
Current assignee: McGraw Electric Co
Priority date: 1946-08-24
Filing date: 1946-08-24
Publication date: 1951-02-13
Anticipated expiration: 1968-02-13

Description

c. M. OSTERHELD GAS WATER HEATER Filed Aug. 24, 1946 Feb. 13, 1951 INVENTOR,

CLARK M. OSTERHELD ATT'Y Patented Feb. 13, 1951 OFFICE GAS WATER HEATER- Clark M. Qsterheld, Stoughton, Wis, assignor to McGraw Electric Company, Elgin, 111., a corporation of Delaware Application August 24, 1946, Serial No. 692,902

1 Claim.

My invention relates to gas water heaters and particularly to gas heated Water heaters.

One object of my invention is to provide means for preventing attack of the hot gases of combustion n the wall of the flue in a hot water tank.

Another object of my invention is to provide a removable lining for the flue carrying off the products of combustion of a gas heater.

Another object of my invention is to provide a single removable aluminum lining for the flue having bafile plates connected thereto.

Other objects of my invention will either be apparent from a description of one form of device embodying my invention or will be set forth in said description and particularly pointed out in the appended claim.

In the drawings,

Figure 1 is a vertical, sectional view through a domestic hot water tank embodying my invention,

Fig. 2 is a view in horizontal section therethrough taken on the line 2--2 of Fig. 1,

Fig. 3 is a fragmentary view in front elevation of a baiiie plate, and,

Fig. 4 is a fragmentary sectional View thereof taken on the line 4-4 of Fig. 3.

Referring first of all to Fig. 1 of the drawings I have there illustrated an ordinary domestic hot water tank H having a, lower closure member I3 connected therewith, said closure member having a cold water inlet pipe 15, and an upper closure plate I! having a hot water outlet pipe [9 connected therewith. A mass it of heat-insulating material such as rock wool surrounds tank H and is held in place by an outer casing 23.

The tank II is provided with an inner flue 25 for upward flow and escape of the products of combustion generated by a gas burner 21 which gas burner is positioned below the tank II. In order to protect the inside surface of the Wall of the flue 25 from attack by the products of combustion, I provide a lining 29 which is preferably made of relatively thin aluminum so that it may easily have its upper and lower ends bent outwardly so that the lining 29 may be held in proper operative position in flue 25.

I provide a plurality of bevel plates 3| here shown as four in number and comprising a relatively narrow elongated strip of aluminum which has been bent to substantially L-shape in lateral section. Bent-over baflie portions 33 are provided in the strip 3| so that the products of combustion are slowed up at least a certain amount and since the narrow edge 35 of the strip 3| is riveted or otherwise suitably secured to the inside surface a! the conduit 29, a relatively large amount of heat will be extracted from the upwardly flowing products of combustion which will flow through the wall of tube 25 and from there into the water.

I may also provide an anti-corrosion unit 31, which may comprise a rod of magnesium either with or without a resistor connected in series electric circuit with said rod and with the Water in the tank whereby I am able to reduce attacks on the inside surface of the tank H and on the outside surface of the flue 25, that is that surface of the tank and of the flue engaged by the water.

The use of the conduit or flue lining 29 protects the inner surface of the flue and causes a slowing down of the upward flow of the products of combustion so that a much better heater is obtained than would be the case without the use of a lining of aluminum such as herein set forth.

Various modifications may be made in the device embodying my invention without departing from the spirit and scope thereof, and all such modifications clearly coming, within the scope of the a pended claim shall be considered as part of my invention.

I claim as my invention:

In combination in a water heater assembly, a storage tank, a gas burner therebelow, said tank having an open-ended flue passing through said tank and the liquid therein and carrying hot gases of combustion from said burner, and a removable thin tubular lining of aluminum separate from the weight-supporting and pressure-sustaining structure of said tank and flue, said lining fitting snug in said flue to provide good heat conduction from the gases of combustion to the wall of the flue, said lining being sufficiently thin that it is mechanically Weak compared to the structural members of the flue whereby it may be crimped for retaining it in place and may also be removed, all without risk of injuring the tank or flue.

CLARK M. OSTERHELD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,211,858 Johnson Jan. 9, 1917 1,553,922 Aram Sept. 15, 1925 1,712,543 Bayer May 14, 1929 1,912,834 Geyer June 6, 1933 FOREIGN PATENTS Number 7 Country Date 699,059 France -r Dec. 8, 1930