US1497623A - Steam-jet water heater - Google Patents

Description

June 10 1924. 1,497,623

J 1 VVEIR STEAM JET WATER HEATER Filed Dec. '29. 1921 2 Sheets-Sheet. 1

& "a ll/ ll I I11 I FIG 7.

June 10 1924.

J. G. WEI R STEAM JET WATER HEATER Filed Dec. 29 1921 2 Sheets-Shoot 2 Patented June 10, 1324.

I UNITED STATES 1,497,623 PATENT OFFICE.

JAMES GEORGE WEIR, F GLASGOW, SCOTLAND, ASSIGNOR TO G. 60 J. WEIR, LIMITED, CATHCART, GLASGOW, SCOTLAND.

STEAM-JET WATER HEATER.

Application filed December 29, 1921. Serial No. 525,717.

T 0 all whom it may concern:

Be it known that I, JAMES GEORGE TEIR,

a subject of the King of Great Britain and Ireland, residing at Cathcart, Glasgow, 5 Scotland, have invented certain new and useful Improvements in Steam-Jet VVa-ter Heaters; and-I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to steam jet water nozzle heaters, that is apparatus in which water is heated by blowing steam into it, the steam being condensed in the water. In such heaters the steam is commonly dis charged through a nozzle into a combining cone or chamber into which water is drawn by the aspirating or injector action of the steam jet, the combining chamber being immersed in the water which it is desired to heat, this water being contained in a tank or other vesselfor example, a feed tank.

The present invention has reference to this nozzle-and-combining-chamber type of heater.

Heaters of this type employed for condensing exhaust steam in feed tanks are subject to heavy pulsations which are very detrimental to the heater and to the tank. These pulsations commence as the feed water is heated up and, with heaters adapted to discharge any considerable quantity of steam, great trouble is experienced from the pulsations when the feed tank temperature reaches and exceeds one hundred and twenty degrees Fahr.

This trouble has been reduced by substi tuting for a single steam jet a number of small jets, discharging through a number of small nozzles, which act in parallel.

The substitution of a plurality of small nozzles for a single nozzle does not. however, necessarily eliminate or sufficiently reduce the trouble. I have found, by experiment, that to adequately diminish vibration it is necessary to limit the internal diameter of the nozzles to a maximum of three quarters of an inch: a somewhat less diameter is preferable. Otherwise the periodicity of vibration is sufficiently low to cause trouble.

The number of nozzles to be employed is, therefore, determined by the quantity of steam dealt with and is not influenced by .the questions of condensing surface, kinetic efliciency, or flow of water.

I have also found that it is conducive to the reduction of vibration to form the nozzles of at least three different lengths so that their vibrations are out of harmony, which reduces still further the intensity of vibration.

The present invention consists in a new and improved combination of parts. The invention will be described in the following specification and more particularly defined in the annexed claims.

The accompanying drawings illustrate the carrying of the invention" into effect in one convenient manner.

Fig. 1 is a vertical section through a feed tank provided with a heater according to the present invention adapted for the discharge of exhaust steam.

Fig. 2 is a longitudinal section through the heater shown in Fig. 1, the section being taken on line 22 of Figure 3.-

Fig. 3 is a cross section on the line 33 of Fig. 2.

c is the feed tank, 7 the steam pipe conveying steam to the heater, and g the combining chamberof the heater. a, b, c, d are the steam-discharge nozzles. These nozzles consist of tubes, which are passed through, and fixed in, the tube plate 72. This tube plate closes the end of the combining chamber except for the passages through the tubes. 70, 7c are the water-admission ports to the combining chamber. Heated water is discharged from the combining chamber at the end m.

There are (in the present example) four sets of steam discharge nozzles. all the tubes of each set being of the same length, but the lengths being different in the several sets. The actual numbers and lengths of these nozzles are r- (I si x nozzles, length five inches.

7)twelve nozzles, length ten inches.

c six nozzles, length fifteen inches. d eight nozzles, length twenty inches. For comparison and to give an example of good practice, it may be said that the length of the combining cone in the present example, from the tube plate to the dis charge end, is thirty-one inches and its internal diameter at the discharge end is nine inches. The diameter of the steam-admission pipe at the tube plate is nine and seveneighths inches, and the steam-discharge nozzles are all of twenty-seven thirty-seconds of an inch external diameter and N0. 10 S. W. G. in thickness.

The steam-discharge nozzles may be divided into a different number of sets.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent is 1. In a Water heater the combination With a Water containing tank and a steam-and- Water combining chamber located in the said tank of a plurality of sets of steamdischarge nozzles in said chamber arranged to act in parallel and means for conveying steam to the said nozzles, the several sets being all of different lengths and no nozzle being more than three-quarters of an inch in internal diameter.

2. In a Water heater the combination with .a Water containing tank and a steam-ami- Water combining chamber located in the said tank of a plurality of sets of steam-discharge nozzles in said chamber, arranged to act in parallel, the nozzles being arranged in concentric circles with the longer nozzles predominating in the interior circles and the shorter nozzles predominating in the exterior circles, and no nozzle being more than three-quarters of an inch in internal diameter.

I hereby sign my name to this specification.

JAMES GEORGE WEIR.

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