Improvements in Steam Vacuum Pumps.
Year: 1890

page_text: ate of Application, 8th Apr., 1890-Accepted, 10th May, 18:0
COMPLETE
SPECIFICATION.
[Communicated from abroad by THE IRRIGATION PUMP COMPANY, a corporation
duly organized under the laws of the State of Colorado, doing business at Sreeley,
State of Colorado, United States of America.]
Improvements in Steam Vacuum Pumps.
I, OLIVER IMRAY of No. 28 Southampton Buildings Chancery Lane in the County
of London, Fellow of the Institute of Patent Agents 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 :-
This invention relates to steam vacuum pumps of the known kind wherein two
closed chambers are alternately supplied with steam which, condensing, produces a
partial vacuum in them, and the object of this invention is to govern the alternate
admission of the steam to the two chambers by means of a valve moved by a small
engine which is worked by the steam or part of the steam used for condensation.
Figure 1 of the accompanying drawings is a side view, Fig. 2 is an end view and
Fig. 3 is a plan shewing the combined engine and valve according to this invention.
Fig. 4 is a transverse section and Fig. 5 is a longitudinal section of the valve.
A A¹ are parts of the two chambers into which the steam to be condensed is alter-
nately delivered by the passages B B'. These passages open from a cylindrical valve
casing C in which is fitted to revolve a rotating valve D. The casing C is a little longer
than the valve D, and it is a little larger in diameter, except in the two portions of
its internal periphery which surround the mouths of the passages B B'; at these places
the valve D fits accurately to the casing. G is a small engine which is shewn as
being a rotary engine but might be an engine of other kind. It is supplied with
steam from the boiler by a pipe J branching from the steam pipe H through a
valve M, which may be a reducing valve adjusted to the pressure required for
working the engine. The engine discharges its exhaust by a port F into the valve
box C. The steam pipe H also connects through a valve N, which may also be a
reducing valve, to the valve box C, so as to supply additional steam if the exhaust
from the engine G is insufficient. On the engine shaft O is a fly wheel P and a
pinion gearing with a wheel R on the shaft E of the valve D, so that as the
engine shaft revolves, the valve shaft revolves much more slowly. The valve D
wanting nearly half of its cylindrical body affords always a cavity in the valve box
by which steam can pass from either of the ports H or F to that one of the two
passages B B which at the time is uncovered by the valve, the other of the
passages B B¹ being then closed by the valve.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. In a steam vacuum pump, in combination with the two vacuum chambers and
the passages to them, a rotary valve caused to revolve slowly by a small steam engine,
the exhaust steam from which, with or without additional steam, is directed by the
position of the valve, into the one or the other of the two chambers, substantially as
described.
2. The construction of the rotary valve above referred to and its casing, substan-
tially as described with reference to the accompanying drawings.
Dated this 8th day of Anril 1890
ABEL & IMRAY,
Agents for the Applicant.