Improvements in Means for Extracting Air from Boiler Feedwater.
Year: 1892

page_text: Date of Application, 4th Feb., 1892
Complete Specification Lett. 26th Oct. 1892-Accented 4th Feb. 1893
PROVISIONAL SPECIFICATION.
Improvements in Means for Extracting Air from Boiler Feedwater.
SAMUEL CHERRY, Engineer 3 Machin Place Canton Cardiff do hereby declare
the nature of this invention to be as follows:-
This is an invention for extracting air out of boiler feedwater. It is a small
pump either double or single acting & attached to either pump levers, or pump
links, to the suction side of pump is attached an indiarubber pipe, (with spiral wire
inside;) & connected to overflow pipe from hotwell, & air pump, there is a flange
on end of indiarubber pipe recessed to take end of overflow pipe, with a brass
washer outside with three small clip springs attached, to keep pipe in place.
When the pump is in motion it extracts all air out of feed water allowing no air
to enter the boilers.
Dated this 3rd day of Februa180
SAMUEL CHERRY.
COMPLETE SPECIFICATION.
Improvements in Means for Extracting Air from Boiler Feedwater.
I, SAMUEL CHERRY, of No. 3, Machin Place, Canton, Cardiff, in the County
of Glamorgan, Engineer, do hereby declare the nature of this invention, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention relates to improvements in means for extracting air from the hot
wells of a condensing steam engine.
It is a well known fact that in all condensing engines, a certain quantity of
vapour comes over with the condensed water, and which, it is obvious, would
naturally rise to the surface of the water and collect in a level higher than the head
valve of the air pump. Experience shews that the vapour above mentioned exerts
an injurious effect upon the boiler after it has entered it.
The object of the present invention is to extract any air and vapour, either or
both, which may present itself or themselves in the hot well, and, inasmuch as they
both possess the same physical properties in respect of extraction by exhaustion,
the improved apparatus hereinafter described is adapted to extract either or both,
as the case may be.
The invention consists in the combination with the overflow pipe of a hot well
of an exhaust pump or its equivalent, and the suction pipe of which is attached to
the overflow pipe in such a way that any excess pressure in the well will blow
it off.
a is the ordinary side lever. is a force pump. Its piston c is shown as worked
from the lever by coupling the rod d thereto, but it must be pointed out that my
invention does not confine me in respect of the position or type of pump or by what
means it is worked. It may be worked from any convenient part of the engine or
be an independent donkey pump. is the hot well and fis its overflow pipe. The
outer end of the latter is enlarged externally in respect of its diameter in any
convenient way. The drawing illustrates this enlargement as consisting of a ring g
convex in cross section. The object of it is to present a raised surface which can
be clipped by the series of clips next described. is a flexible suction hose made
preferably of india rubber lined with a wire spiral. i, are spring clips made fast
to the end of the suction pipe from which they project in a forward direction. The
clips are of a proper shape, projection and resilience, to close upon the ring and, by
[Pce dl

page_text: such closure, to hold the end of the suction pipe tight up to the overflow pipe.
j is a valve box in constant communication with the cylinder of the pump b. The
suction delivers into it. k is the foot or suction valve of the pump, and I is a
valve vibrating in opposition to the valve k. Its function is to provide for the
expulsion of the air by the return strokes of the pump.
The object in making the connection between the suction pipe h and the overflow
pipe in the way illustrated is to allow the end of the hose and coupling being
blown off in case of excessive pressure from the water overflowing from the hot
well, and provided that proper provision is made for such connection being broken
by such pressure, the connection in question may be arranged for in any convenient
way.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, i declare that what I
claim is
1. The combination with the hot well of a pump adapted to extract air or vapour
therefrom, as set forth.
2. The releasable method of coupling up the suction of the extracting pump
referred to in the preceding claim, to the hot well or to any pipe leading therefrom,
as set forth.
3. The hereinbefore method of coupling the suction pipe to the overflow from
the hot well, as set forth.
Dated
51 1.
COL1000
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicant.