Improvements in Percussion Turbines or Impulse Wheels.
Year: 1889

page_text: Date of Application, 24th Dec., 1889-Accepted, 25th Jan., 1890
COMPLETE SPECIFICATION.
Improvements in Percussion Turbines or Impulse Wheels.
CHARLES LOUIS HETT, of Turbine Foundry, Brigg, in the county of Lincolnshire,
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:-
This invention has for its object the production of an effective water motor capable
of using a variable quantity of water to the best advantage by the combination of a
regulating nozzle with a percussion or impulse water wheel. The combination by
this invention is new simple and effective.
Hitherto the methods of supplying the water used in Percussion Turbines and
Impulse Wheels has been by a simple nozzle or nozzles, and the method of regulating
the flow of water has been by a cock or valve. The effect of such regulation being
that when a portion of the water was shut off, the velocity of the jet was also
diminished and a loss of efficiency resulted.
In this invention I use an adjustable nozzle of a similar character to the steam jet
valve of an injector by which the quantity of the water striking the buckets of the
Percussion Turbine or Impulse Wheel may be regulated from nothing up to a
maximum. I do not confine my invention to the use of any kind of bucket_but
prefer that known as a "Pelton" wheel, which is a slight modification of those
employed in a patent for a steam turbine granted to Christian Schielle dated
26th July 1855 No. 1693.
The nozzle may be fixed in such a manner as to deliver the jet of water at any
angle on the buckets which are arranged around the circumference of the turbine or
water wheel.
I am aware that Percussion Turbines and Impulse Wheels of various descriptions
have been used as water motors. I am also aware that injector or coned valves have
been used for controlling the size of jets of water and I therefore make no claim
to the use of Percussion Turbines alone or to the use of injector or coned valves
alone.
In the accompanying Drawing I show a longitudinal section of a Percussion
Turbine and an injector or coned valve combined, in which A is a percussion or
bucket water wheel, are the buckets arranged around its circumference, (is the
wheel case in which the percussion wheel works, D is the inlet pipe, E is the nozzle,
F is a pointed cone valve or spindle placed concentrically in the nozzle, G is the
hand wheel for regulating the position of the coned valve, which determines the
size of the water jet impinging on the buckets of the percussion wheel, and regulates
the quantity of water, but in no way diminishes the velocity of the issuing water or
the force with which it strikes the buckets.
The water driving the percussion wheel passes into the inlet pipe D up to the
nozzle E, where it is regulated by the spindle F, similar to that of an ordinary
injector, after which it strikes the buckets B driving them and the wheel A upon
which they are fixed, in the direction shown.
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:
The combination of a controlling nozzle fitted with a coned valve substantially as
shown, with a Percussion Turbine or Impulse Wheel as set forth.
Dated this 94th day of Dreamhar
CHARLES LOUIS HETT,
Turbine Foundry, Brigg, Applicant.