Improvements in Water Circulating and Heating Appliances, for Producing Hot Water Supply for Heating Buildings, and in Apparatus connected therewith.
Year: 1889

page_text: Date of Application 7th Nov., 1889-Accepted, 7th Dec., 1889
COMPLETE SPECIFICATION.
Improvements in Water Circulating and Heating Appliances, for
Producing Hot Water Supply for Heating Buildings, and in
Apparatus connected therewith.
1 HARRY WARD Aston Union Erdington in the County of Warwick, 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 that class of water heating and circulating apparatus in
which steam is utilized to heat water and sometimes to circulate it by the adapta-
tion of the well known "Giffard" injector principle in the construction of steam
jet circulators and heaters. My object is to produce a simple and easily constructed
form of injector which is silent in its action and at the same time readily accessible
in its parts and readily placed in position without a complication of joints and
connections. In addition to this I desire to arrange the connections between the
steam boiler and injector in such manner that the system operates automatically
so soon as the steam pressure attains a certain point when steam is raised and I
also prevent flow back of the hot water supply to the steam boiler should steam
pressure fall while at work.
In carrying my invention into effect I construct my injector in such manner
that it consists essentially of a straight length of cast pipe or tube with the
customary flanges to connect up in the range of pipe. into the side of which I
cast or form an inclined pipe part of which is of the same area as the main
circulating pipe and part is of conical configuration terminating in a cylindrical
portion internally of the greatest diameter of the cone and closed by a flange and
suitable bolts or studs. Into this conical portion is introduced a conical brass
piece terminating in a cylindrical portion suitably supported by bored ledges.
The conical brass piece is smaller in diameter than the conical space in the pipe and
opens to it by a number of slots or perforations and the passage from one end of the
pipe curves up and passes into the cone space which then communicates with the
other end. An internal jet or nozzle is slipped into the brass conical piece and is
supplied with steam from a space behind communicating with a steam supply pipe.
A metal cap suitably perforated inserted in this space behind the steam jet nozzle
and conical piece and under the closing flange serves to keep them in position by the
aid of the flange and permits of ready removal by removing the said flange without
disconnecting that portion of the injector which is permanently connected to the main
system of pipes.
poses.
This improved form of injector may be applied either for heating and circulating
the water required to heat a building or for heating water for hot water supply pur-
When required for heating a building in addition to the ordinary stop valve
upon the steam supply pipe 1 place a check valve allowing the steam to pass to the
steam nozzle but preventing the water from passing back into the boiler should the
steam pressure become low. When the system is used for circulating and heating
water fer heating purposes only it is necessary to provide for the continuous removal
of the condensed water continually added to the system by the steam jet. For this
purpose I provide an overflow at a sufficient height in the building to keep up the
required pressure in the pipes.
In order that my invention may be readily understood and properly carried into
effect I append hereunto an explanatory sheet of drawings to which I shall herein-
after refer. Figure 1 is a section of my improved steam jet heater and circulator and
Figure 2 is an external view. Figure 3 is a diagramatic section of a building
showing the direction of flow in heating the position of the overflow and the action
of the check valve on the annale steam nine

page_text: 1
The steam supply enters my improved steam jet heater and circulator A by the
inlet pipe B and it passes the cylindrical brass piece C (Figure 1) which serves to
hold in position the stean nozzle D and the conical brass piece E, to the nozzle D
from whence it issues in the direction of the arrow and induces a current of water
to pass from the part F to G and so on through the whole system returning to F
again as shown by the arrows, at the same time the water is heated by the con-
densation of the steam to any desired extent within certain limits. The cylindrical
shell or piece C is held in position by the set screw H passing through the cover I.
Upon the steam supply pipe B I place a check valve of any usual construction in
addition to the ordinary stop valve in order to allow the steam to flow freely to
the nozzle but at the same time to prevent water ever passing back should the
pressure be reduced. My improved jet heater and water circulator is bolted in the
straight line of the circulating or other pipes by the flanges K. L. and the nozzle D
is readily removed without breaking the main joints by removing the cover I
when the cylindrical shell C can be at once lifted out and then the nozzle D and
the conical piece E removed for examination or cleaning.
It is desirable to provide stop cocks or valves on both sides of the jet circulator
in order to isolate it from the water when the cover I is to be removed and avoid
the necessity of emptying the system of pipes.
My improved jet heater may be constructed in duplicate form if desired which
form presents certain advantages.
Figure 3 shows diagramatically the action of my apparatus. The jet heater is
shown at A and it heats and impels the water in the direction shown by the arrows
while the overflow relieves the accumulation of condensed water at M which is also
the cold inlet pipe, and allows it to discharge through the pipe N. The pipes are
filled from the cistern O containing a ball tap. When the hot water is drawn off at
intervals for various purposes it is of course unnecessary to provide an overflow.
The check valve is indicated at the position P. Figure 3.
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 improved construction of steam jet heating and circulating apparatus
consisting of the nozzle 1), the conical piece E and the shell C with the cover I as
shown in Figure 1 of the accompanying drawing substantially as and for the
-purpose herein before described.
(2.) The combination of the steam jet apparatus A, Figure 1, and
check valve
on the supply pipe B to prevent the water flowing back to the boiler should the
pressure fall too much substantially as and for the purpose herein before described.
Dated this 6th day of November 1889.
CLERK & MARKS,
13, Temple Street, Birmingham, Agents for Applicant.