Internal-combustion engines – Rotary – Only combustion and expansion of charge in engine
Patent
1987-06-25
1989-05-02
Husar, Stephen F.
Internal-combustion engines
Rotary
Only combustion and expansion of charge in engine
123238, F02B 5300
Patent
active
048258270
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a rotary-type heat engine for the generation of shaft power. In detail, this invention relates to compression, combustion and expansion processes that belong to the basic principle of operation of a heat engine.
In this invention, these processes are performed in each independent working chamber, in contrast to a Reciprocating Piston Engine. The expansion system of this invention can also be separate from the compression system, so this invention can be applied to not only a Diesel Engine System or Gasoline Engine System but also to a Gas Turbine System or Steam Turbine System.
BACKGROUND ART
A Diesel Engine has the advantage of high thermal efficiency due to operating at high temperature, but it has also the disadvantages of heavy weight, reciprocating unbalance, too much energy loss exhausted to atmosphere, etc.
In the Reciprocating Piston Engine and the Wankel Rotary Engine, there are available pressure gases, not fully expanded in their working chamber at the end of the expansion stroke, and then these pressure gases are exhausted to atmosphere at the next exhaust stroke.
A Gas Turbine has the advantages of low weight, no reciprocating unbalance, continuous power generation, etc., but because it operates at comparatively low temperature, it has also the disadvantage of low thermal efficiency.
The following is a brief description of the Circumferential Piston Pump, a kind of rotary pump, related to this invention.
The pistonlike rotor elements, supported from cylindrical hubs inset into the pump end plate, travel in circular paths in mating body bores. The rotors do not mesh or touch, and fluid seals exist only between rotor and stator surfaces, and not between rotors. It is characteristic of a circumferential piston pump that the rotors do not mesh with, or contact, each other. This is distinguished from lobe, gear, and screw pumps. The radial surfaces and axial-end surfaces of the rotor-piston elements run in clearance contact with the body wall. And load-bearing cotact may exist in these zones. Each rotor in a Circumferential Piston Pump feels the full pumping torque alternatively.
This pump operates at a high compression efficiency under a low compression ratio, and yet it has low compression efficiency under compression ratios higher than "1:2", because high pressure gases compressed by one rotor backflow instantaneously into the pumping chamber of the other rotor which just starts compressing low pressure gases, so the kinetic energy related to backflowing of gases increases the entropy of gases.
DISCLOSURE OF INVENTION
The object of this invention is to provide a Rotary-Type Heat Engine having the following advantages: high thermal efficiency, no crank, no valve, no reciprocating unbalance, simple and fewer components.
This object is achieved by the device according to the invention having the characterizing features set forth in the accompanying claims.
The basic structure for the device in accordance with this invention, consisting of 2-stage working chambers, is the same structure as if two Circumferential Piston Pumps (one is small and the other is large) are combined closely in series, that is, one pump consists of 2-stage pumping chambers with two pairs of Circumferential Pistonlike Rotors.
Herein the device related to this invention is characterized in that one of two working chambers combined closely in series is small in size and the other is large in size. And the details are as follows.
Each working chamber having a pair of circumferential pistonlike rotors is connected to the other by a comparatively small gas-passageway. The pistonlike rotors, supported from cylindrical hubs, travel in circular paths in mating body bores. And there is a certain phase-angle of the small pistonlike rotor relative to the large one, and all the pistonlike rotors in the working chambers are rotated at the same rotation speed by timing gears.
This invention like a 2-stage Circumferential Piston Pump has the function of compression and expansion generally req
REFERENCES:
patent: 3214907 (1965-11-01), Martin
patent: 3724427 (1973-04-01), Sauder
Husar Stephen F.
Meller Michael N.
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