US2051311A - Hot water heater - Google Patents

Description

Aug. 18, 1936.

R.E.MOORE HOT WATER HEATER Filed Jan. 4, 1935 fl 6 n n MAE! l:l %.j 6 I v 15 i 24 j%, 41 :7; I 7/ I W J6 6 Ewen/$04" wags?) OZ'(2 "ZZd96/ b77Z0O/"6 Patented Aug. 18, 1936 UNITED STATES HOT WATER HEATER Robert Edwin Moore, Chicago, Ill., assignor to Bell & Gossett Company, Chicago, Ill., a corporation of Illinois Application January 4, 1935, Serial No. 394

2 Claims.

My present invention relates to the provision of a non-liming hot water heater with temperature control and, as the above designation implies, has for its object, first, the provision of a hot water heater in which water containing salt of calcium in solution may be heated without causing a deposition of lime upon the heater, and, second, the provision of a heater in which the maximum temperature to which the water can be heated is controlled or regulated.

I have accomplished these objects by means of the structure illustrated in the accompanying drawing, in which- Fig. 1 is a schematic View of a boiler and a hot water storage tank with a water heater embodying my invention assembled with and forming the connection between the boiler and the tank.

Fig. 2 is a central vertical elevation through the heater casing.

Fig. 3 is a fragmental detail, partially in section, of the means employed for adjusting the apparatus to secure the desired maximum heating temperature.

Similar reference characters refer to similar parts throughout the respective views.

The water heater or heat transfer device consists of a cylindrical casing 5 having, preferably, a semi-spherical bottom 6, the center I whereof is tapped and threaded for receiving the piping constituting the return 8 to the boiler. The top of the casing 5 is a removable closure plate 9 held to the casing by machine bolts ID, or other suitable means. Installed within the casing 5 is a coil I I, preferably of copper because of its heat conducting properties, which coil II is connected through ports l2 in the casing by means of tubes l3 with the hot water storage tank M. The form and arrangement of the casing 5, coil H and connection between the coil II and the hot water storage tank 14 are in accordance with present standard practice.

Instead, however, of connecting the casing 5 through ports l5 and I6 directly with the boiler I! I connect the ports 15 and IS with the tubular ends l8 and 19 of a fitting comprising such tubular ends connected by a tubular body portion 20. The tubular body portion 20 is extended beyond the tubular end l9 and the end of such extension is closed by a clean-out plug 2|.

Mounted and secured at the lower end of the tubular body portion 20 is a bi-metallic thermosensitive strip of metal 22. The strip of metal 22 passes through the bore in the member 20 beyond the central line or axis of the tubular end [8 and adjacent the end thereof is provided with a valve 23 which co-operates with the valve seat 24 located in the tubular end portion l8. Connecting with the outer end of tubular portion I8 is a pipe 25 which leads to the boiler l1 5 at a point adjacent but below the water line' thereof. About the middle of the tubular body portion 20 is provided a bore 26 in which is slidably mounted the stud of a bridle member 21 through which the bi-metallic strip 22 passes. A 10 screw 28 and a lock nut 29 are provided by means of which the position of the bridle 21 may be adjusted which will control the temperature at which the bi-metallic strip 22 will raise the valve 23 from its seat 24. The boiler water is caused to circulate through the casing 5 by gravity inasmuch as when the water condenses by contact with the coil H and becomes heavier and falls it will be returned to the bottom of the boiler l1 and hot water will flow into the casing 5 through the pipe 25.

The bridle 21 is adjusted so that when the boiler water flowing into the casing 5 has attained the hottest desired temperature the bimetallic strip will fiex so as to seat the valve 23 upon its seat 24, but when the temperature of water in the casing 5 is below the hottest desired temperature the bi-metallic strip 22' will be flexed in the opposite direction so as to raise the valve 23 from its seat 24 and permit the hot boiler 30 water to enter the casing 5.

Much, if not all, of water available for service distribution is what is known as hard and one reason for the hardness in water is that the water contains carbon dioxide gas in solution and water with carbon dioxide gas in solution is capable of dissolving calcium carbonate. When the water is heated the carbon dioxide gas is driven off and the calcium carbonate is deposited.

It is found, however, that if the water is not. heated above or F. the carbon dioxide gas will not be driven off andthe calcium carbonate will not be deposited.

The water to be heated passing through the coil H can never be raised to the temperature of the boiler water circulating about the coil H in the casing 5, but the water to be heated will raise to about 10 to 15 of the temperature of the boiler water so that if the bi-metallic strip is set to open the valve 23 at say or F. the water in the coil II will never'be heated to a point where the lime will be deposited. Moreover, service water heated above 135 or 140 F. is liable to start the joints and the packing in the hot water distribution system and is dangerous, or liable to 7 be dangerous, to the person using the'water.

' While a 'hot water heater of this kind is not an excessive absorber of the heat from the boiler waterit, nevertheless, absorbs some of the heat j and my present invention limits-such absorption 7 strictly to the amount necessary to bring the service water supply to the temperature required. By making the bi-metallic strip 22 substantially as' long as the coil H it is responsive to'and actuated by the temperature of all of the water which is acting upon the coil H and not merely the hottest portion thereof located adjacent the valve 23. r a 7 Having described my invention what -I claim is new and desire to secure by Letters Patent is:

1. In combination witha hot water heater comprising acasing adapted to be connected to 'a boiler for securing acirculation of boiler. water therethrough and having a heat transfer coil adaptedto be connected with a service water supply installed within said casing, a fitting having transverse end channels therein adapted respectively to beincluded inthe conduit from the cas ing to the boiler and to the casing at a point adjacent'the bottom thereof, and'a connecting means with a channel establishing communica:

tion between'said end channels in which communicating channel is mounted a bi -metallic element, and a valve carried by said bi-Vmetallici element cooperating with a valve seat for controlling the passageway from the boiler to the casing.

2. In combination with a hot water eat r com- 7 prising a casing adapted to be connected to: a

V boiler for securing a circulation of boiler water therethrough and having a heat transfer .coil adapted to be connected with a service water sup- 7 ply installed within said casing; a fitting having co-operating with a valve seat for controlling the passageway from the boiler to the casing, and

means for adjustably modifying the flexing of saidbi-metallic element. 7

ROBERT EDWIN MOORE.

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