US1490860A - Indirect water-heating apparatus - Google Patents

Description

April 15 1924. 1,490,860

c. SMITH ET AL INDIRECT WATER HEATING APPARATUS Filed Feb. 17, I922 Berzram C. [fa/p By Httome];

Patented Apr. 15, 1924.

, STATES PATENT oFFicE.

CHETWOOD SMITH, F WORCESTER, AND BERTRAM G. HARPER, OF BOSTON, MASSA- CHUSETTS, ASSIGNORS TO STACK HEATER COMPANY, OF BOSTON, MASSACHUSETTS,

A CUORATION OF MASSACHUSETTS.

INDIRECT WATER- ENG P TUS.

v To all whom it may concern:

Be it known that we, Cm'rwoon SMITH and BnRTRArZt C. HARPER, citizens of the United States, said SMITH residing at 5 Worcester, in the county of Worcester and State of Massachusetts, said HARPER residing at Boston, county of Sufiolk, and State of Massachusetts, have invented a new and useful Indirect Water-Heating Apparatus,

mof which the following is a specification.

' lihis invention relates to' improvements in indirect Water heating apparatus such as is umd in hot water storage and supply systems. Similar devices nowcommonly in use are efl'ective for heating the water supply under normal conditions of operation, but having a marked tenden to become overheated at times of reduced emand, particularly, if associated with main heaters used tor-other put.

it is the neral object of our invention to improve't e construction of such heating apparatus, particularly by provig improved devices for preventing or relieving overheatin and for maintaining an adequate supp y of water in the indirect heatin system.

nether object of our invention is to provide for proper disposal of the steam or water, it any is discharged from the indirect system by reason of overheating.

. @ur invention further relates to arrange ments and combinations of parts which will he hereinafter described and more particularly pointed out in the appended claims.

A preferred form of our invention is shown in the drawing which is a front elevation of our improved apparatus, parts thereof being shown'in section. v

Referring to the drawing, we have shown a hot water storage tank 10 which ay be (ill of any usual construction and which is provided with the usual cold water supply pipe l1 and hot water discharge pipe 12. The 24 storage tank 10 is connected by upper and lower pipes 13 and is to the opposite ends of a coil or nest of i t 15 contained within a casing 16 and orming therewith an i indirect Water heater.

A main heater 20 is shown in the drawings and, in this particular w .5 1| m. of our invention, this heater is inthe form of a hot air furnace. A heating unit 21 extends into the fire box of the main heater 20 and is connected b upper and lower pipes 22 and 23- with the indirect heater casin l6. A water supplytank 24 is connected y a pipe 25 to the lower connection .23 between the heating unit and the indirect heater.

The tank 24 is open to the atmosphere and the water level therein is controlled by a float valve of any usual form.

A vent pipe 26 extends upward from the upper connection 22 and is provided with an outlet 27 controlled by a. valve 28. A pipe 29 extends from the pipe 26 to the heater 20 where a branch pipe 30 extends 'into the ash pit of the heater and isprovided with a valve 31. A second branch pipe 32 controlled by a valve 34: extends into the water box 33 commonly provided in hot air furnaces for moistening the air passing through the furnace. A safety valve 35 of ang usual design is also preferably connecte to the pi 26. y

be open at all times and the safety valve 35 is required for protection only in the event that all of these valves are accidentally closed at the same time.

Assuming that the valve 28 only is open, the pipe 26 will be filled with water to the level of the water in the supply tank 24:, hut will permit the discharge of steam from the indirect heating system should the same become overheated. This condition not infrequently arises, particularly in house heat ing apparatus on occasions when the main heater 20 is being heavily fired while the demand for hot water from the tank 10 is at the sametime reduced. Should the water in the indirect system become overheated, the steam is discharged from the outlet 27 and any water discharged therewith is immediately replaced from the supply tank lt is sometimes objectionable to discharge this steam and water mixture directly into the atmosphere of the cellar or other space in which the heater is located. To avoid this objection, we have provided the pipe 29- and its branch pipes 30 and 32. en the pipe 30-is open, the steam or water from the vent pipe 26 is discharged into the ash pit of the, heater. The steam passes upward through the fuel bed and may he of actual' nection is sufiicient in whic advantage in the process of combustion. If the steam and water is discharged through the pipe 32 into the water box 33, the temsystem in which all three of these relief connections are provided, in actual use it will.

be usually found that a sin 1e selected concase no shutoif valve or safety valve is necessary.

Certain of the advantages of ourv invention may be obtained by the use of the sup- 7 ply tank 24 and its connecting pipe 25 only,

omitting the vent pipe 26. In this 8.36, the excess of pressure caused by the overheating of the unit 21 is to some extent relieved through the pipe 25. Satisfacto operation is, however, much improved by t e addition of the vent pipe 26 connecting into the upper ipe 22. v Y

will be evident that changes and modifications can be made therein by .those skilled aving thus described our invention, it

in the art within the spirit and scope of our invention as set forth in the claims, and we do not wish to be otherwise limited to the details herein disclosed but what we claim is:

1. Water heating apparatus comprising a storage tank, an indirect water heater therefor, a main heater, a heating unit therein, upper and lower connections forming with said indirect heater and said unit an indirect heating system, a water supply, and a vent pipe for said system discharging into the ash pit of said main heater.

2. Water heating apparatus comprising a storage tank, an indirect water heater therefor, a main heater having a water box, a heatin unit in said main heater, connections f drming with said indirect heater and said heating unit an indirect heatng system, and a vent pipe for said system, said vent pipe discharging into said water box.

In testimony whereof we have hereunto aflixed our signatures.

CHETWOOD SMITH. BERTRAM C. HARPER;

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