Year: 1886

page_text: I, WILLIAM ROBERT PARK, of Taunton, in the County of Bristol, and State of
Massachusetts, in the United States of America, machinist, do hereby declare the
nature of my 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 is designed mainly for feeding boilers, but is applicable also to other
uses; that form of it shown in the drawings is, however, especially designed for use
as a boiler feed.
In Figure 1 of the drawings is shown a lengthwise section of an apparatus embodying
all the features of my invention; and in Figure 2 a diagram of the same.
A represents the water supply inlet, which communicates by proper pipes with the
water reservoir; and a is the water chamber. The steam inlet B has two branches b, 1,
so that steam entering at B flows by branch through nozzle D and by branch bi
through nozzle F, which in that form of my apparatus shown in the drawings is the
annular space between the end of tube d¹ and the entrance of tube f. When used as
a boiler feed the steam inlet B is connected by pipes with the steam space of the
boiler. The tubes d, d' are the combining tube and the delivery tube of the nozzle D,
and the tubes, f¹, fare the combining and delivery tubes of the nozzle F.
The overflow G is closed by the valve g opening outwards, and this valve opens
when there is pressure in chamber H, but is held closed when there is a partial vacuum
in chamber H.
None of the parts are new in themselves, nor is the combination of the two nozzles,
each with its combining and delivery tubes new, for as is well known to all skilled in
this art, that combination is shown in Letters Patent of the Kingdom of Great
Britain and Ireland to Henry Jacques Giffard, No. 1665 of the year 1858; and my
invention is an improvement upon the apparatus shown in Figure 2 of that patent
and consists mainly in modifying the overflows, whereby the operation of the apparatus
is made more certain and effective.
In Giffard's apparatus the lifter overflow was formed by separating the combining
and delivery tubes of the lifter jet; and this overflow I retain at d³, but connect it
with the water chamber a, and thereby materially modify its operation; for in my
apparatus the opening d' is rather a regulator than an overflow, spilling or discharging
'מ
077

page_text: the surplus water, when too much enters the combining tube d, and admitting more
water when too little is taken into tube d; for as will be clear to all skilled in the art,
the nozzle D and tubes d and d¹ will not act with their maximum effect under a
certain pressure of steam when the tubes d d' are made without opening d³, as shown
in Figure 2; for in that case if the steam pressure be too low, more water will enter
combining tube d than can be properly delivered through tube d¹, while if the steam
pressure be too high, the quantity of water passing through tubes d d' will be less
than it should be.
While I am aware that I am not the first to connect the throat-or junction of the
combining and delivery tubes of the lifter jet with the water chamber, I am, so far as
I know, the first to combine the nozzle D, nozzle F, tubes f, f¹, f, and overflow G
with the tubes d, d', having the overflow d³ at their junction leading to the water
supply, and this combination is the main feature of my invention.
In Giffard's apparatus the combining tube of forcer jet, corresponding to the
tubes, of my apparatus was not connected with an overflow; and another feature
of my invention consists in the combination of the nozzle D, tubes d, d', and nozzle F
with the tubes f, f, f³, when the tubes f, fare connected with overflow G. This
combination is new with me, so far as I know, although I am aware that I am not
the first to make openings in the combining tube of the forcer jet and to connect these
openings with the overflow; but in all jet apparatus known to me, the combining
tube of the forcing jet either lacked the connection with the overflow, as in Giffard's
apparatus, or else was not used in combination with the lifter jet and its combining
and delivery tubes.
The practical value of my improvements on the Giffard apparatus will be clear from
an understanding of the operation of my apparatus.
When steam is let on, it flows through the nozzle D, tubes d, d¹, nozzle F and
tube and escapes freely through openings f³ and overflow G; thereby tending to
form a vacuum in the water chamber a and in the water supply pipe leading from it.
The result is a current of supply water mixed with condensed steam through
tubes d, d, f, f¹, f', and chamber becomes full of water under pressure due to the
effort of the current from tube f to enter it, and the pressure in that chamber raises
check valve K and water enters the boiler. As soon as this takes place any steam or
water remaining in chamber H is carried along by the current in tubes f, f³, f³, and
chamber H becomes a vacuum chamber; the valve g being then held upon its seat by
the pressure of the atmosphere.
This apparatus consisting of the two steam nozzles D and F, the tubes d, d², f, f¹, f*,
the water chamber a, chamber H and its overflow G, with the openings fleading to
the overflow, constitutes an efficient apparatus for lifting water to a great height, as
well as for feeding a boiler; and works admirably at that steam pressure to which the
nozzles and their combining and delivery tubes are adapted, requiring no other
manipulation than to let on or shut off steam.
This apparatus is illustrated by the diagram Figure 2, and does not differ in
substance from the practical apparatus as shown in Figure 1, except only in the
absence of the openings d' at or near the junction of the combining and delivery tubes
of the lifter jet. The difference is that the apparatus illustrated by the diagram is
not well adapted to varying pressures of steam, while the apparatus shown in Figure 1
is self-regulating and works equally well at widely varying pressures.
The main merit of my apparatus is that nothing need be done but turn on the steam,
when the apparatus takes care of itself.
As the steam pressure varies, the quantity of water taken into the tube d and
delivered to tube f also varies, more being taken in under steam of heavy pressure
than under steam of a lighter pressure. It is for this reason that the holes at the
junction of tubes d and d¹ make a practical improvement in the working of the
apparatus; for they adapt it more perfectly to use with steam varying largely in
pressure. The apparatus with these regulating tubes works admirably under all
pressures with which I have been enabled to test it, from low steam up to steam of
over 100 pounds.

page_text: The openings f' in the tube f and between f and f¹ are connections with the
overflow G, and as will be clear, these two tubes f and f¹ may be a single tube, as
shown in Figure 2, if the area of the opening f³ be sufficient to allow the steam from
both nozzles to escape readily through the overflow.
The valve serves to allow the apparatus to drain when the steam is shut off; it is
forced upon its seat by the pressure of the water in chamber J (or f³) when the
apparatus is in operation, and opened by atmospheric pressure when steam is shut off.
A pipe with a stop cock leading from chamber J as shown in Giffard's patent may
be used in lieu of valve j.
Having now particularly described and ascertained the nature of my invention and
in what manner the same is to be performed, I declare that what I claim is:
First In combination, nozzle D, tubes d, d', water chamber a, nozzle F,
tubes f,f,f, with openings f³ and overflow G, the openings f³ connecting the
combining tube of nozzle F with overflow, all substantially as described.
Second-In combination, nozzle D, tubes d, d¹, with opening d³, water chamber a,
nozzle F, tubes f, f', f', with openings f³, and overflow G, the openings d² con-
necting the combining tube d of nozzle D with the water supply, and the openings f³
connecting the combining tube f, f¹, of nozzle F with the overflow, all substantially
as described.