US1329115A - Spark arrester and quencher - Google Patents

Description

SPARK APPL ; EVANS.

ER AND QUENCHER. ILED SEPT.9.1919.

Patented Jan. 27, 1920.

2 SHEETS-SHEET I- 4 INVENTOR war flliwns A B I d ORNEYS E. A. EVANS.

SPARK ARRESTER AND QUENCHER. APPLICATION FILED SEPT. 9. 1919.

Patented Jan. 27, 1920.

2 SHEETS-SHEET 2- INVENTOR .ZZZLJ/(ZT' filiana EDGAR A. EVANS, 0Z5 VICTORIA, COLUMBIA, CANADA.

SPARK AEBESTEE AND QUENGI-IER.

Application riled September 1919.

To all whom it may concern:

Be it known that 1, linear, A. EvANs, a citizen of the United States, residing at Victoria, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Spark rrrresters and Quenchers, of which the following is a specification.

This invention relates to a means for arresting and quenching sparks as delivered in the smoke-stack of a steam generating boiler or the like, and is particularly de signed for application to boilers as used in lumber camps or elsewhere having readily inflammable surroundings.

The invention is particularly described in the following specification, reference being made to the drawings by which it is accompanied, in which:

Figure l is a general view of the boiler showing the application or" the spark quenching device and its attendant parts.

Fig. 2 is a vertical section to an enlarged scale of the spark quenching device to the head of the smoke-stack, and

Fig. 3 is a horizontal section on the line 33 in Fig. 2.

In these drawings 2 represents a steam generating boiler, and 3 its smoke-stack. To the head of the smoke-stack is secured on a suitable light metal frame a frusto-conical mesh screen 5. The smaller end of this screen is directed upward and has a circular opening 6 and the lower end projects concentrically beyond the circle of the smokestack, leaving an annular open space T. Gutside of this screen 5 is supported on a suitable frame a conoidal outer screen 9 and within this screen 9 is a coil 10 of metal pipe having small apertures at intervals apart directed upward and inward against the inner screen 5, the axes of the jets, preferably, being approximately tangential to the surface of the screen at their points of contact therewith.

Through this Perforated pipe 10 water is delivered under pressure with the object that the water spray will quench the sparks as delivered from the smoke-stack.

As a water service under pressure is not generally available in logging camps, the desired object is attained by delivering the water to a pipe 11 from an injector 12, the water being drawn from a water tank 13 to which the service water is delivered. The injector may be operated by steam direct from Specification of Letters Patent.

Patented Jan. 27, 1920.

Serial No. 322,717.

the boiler, a very small jet of which will be suliicient for the purpose, but preferably by compressed air from av reservoir lat into which it is compressed by a direct acting steam-operated pump 15.

The essential feature of the invention lies in the delivery of a water spray against the spark arresting screen.

I do not desire to be confined to the particular form of spark arresting screen or screens used, nor to the manner here shown delivering the water.

its the loppings and trimmings of forest trees about logging camps dry up, they become very inflammable, and the loggers are anxious to take every precaution to prevent fire, as if the fire runs through their limits, their available timber supply is lost. Spark arresters are in themselves of little protection, as if a boiler fire of a logging engine is forced, the sparks will be driven through the screen and may beca-rried by the wind into inflammable brush.

With this device no live sparks can be projected from the screen. They are immediately quenched by the water spray as they are projected from the smoke-stack, either as hey pass through the screen or are retained by it.

The provision of a double screen is not an essential, but is believed to be a desirable feature.

Having now particularly described my invention, I hereby declare that what I claim as new and desire to be protected in by Letters Patent, is:

1. The combination with the upper end of a smoke-stack, of means for delivering a finely divided spray of wa er across the exit area of it.

2. The combination with the upper end of a smoke-stack and a spark arresting screen thereover, of means for delivering a finely divided spray of water inward onto the screen.

3. The combination with the vtop of a smoke-stack and a spark arresting screen thereorer, of means for delivering fine jets of water under pressure inward onto the screen the axes of the jets being approximately tangential to the surface of the screen at their points of contact therewith.

4c. The combination with the top of a smoke-stack, of a frusto-conical screen, the base of which. is concentric with and outside the circle of the smoke-stack and the upper lOO end of which is relatively smaller in diameter than the smoke-stack, and a coil of pipe spirally disposed around the outside of the screen and finely apertured around the inner side the axes of the apertures being directed upward and inward to beapproximately tangential to the surface of the conical screen at their places of contact.

5. The combination with the top of a smoke-stack, of a screen extending from a ring secured to the top of the smoke-stack to be concentric outside the same, to a ring concentric with the smoke-stack but of relatively smaller diameter, an outer screen conforming generally to the first named screen and inclosing the upper open end, and a coil of pipe bent spirally around the inner side of the outer screen and finely apertured at intervals apart, and meansfor delivering water under pressure to the pipe coil to direct a finely divided spray into the space between the screens.

6. The combination with the top of a smoke-stack of a screen extending from a ring secured to the top of the smoke-stack to be concentric outside the same, to a ring concentric with the smoke-stack but of relaively smaller diameter, an outer screen conforming generally to the first named screen and inclosing the upper open end, and a coil of pipe bent spirally around the inner side of the outer screen and finely apertured at intervals apart, the axes of the apertures being approximately tangential to the surface of the inner screen at their places of contact therewith, and means for delivering water under pressure to the pipe coil to direct a finely divided spray into the space between the screens.

7. The combination with the top of a smokestack and a spark arresting screen thereover, of a coil of pipe outside the screen, said pipe provided with small apertures along its inner side directed toward the screen and means for delivering water under pressure to the perforated pipe.

In testimony whereof I aflix my si nature.

EDGAR A. Evans.

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