Abstract:
The future of the piston engine in surface vehicles is uncertain.  
     Today, four fiths, 4/5, the car fuel is wasted, but this invention to allow to double the efficiency of car piston engine.  
     This invention can augur good news for business with a sustainable enviroment without compromising personal mobility.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
         [0001]    An internal combustion engine of open closed cycle and binary fluid with the principal mechanical parts driven by gyratory screws with external synchronized timing gears, characterized by a compression of air cooled by water with air flow and pressure modulation, regenerative air heating, gases heating for continuous combustion, gases dry expansion from a constant maximum temperature, gases and steam superheated re-heated by continuous combustion, gas and steam superheated dry expansion from a constant maximum temperature, and exhaust gases cooling for condensation and water recovery.  
           [0002]    The invention belongs to the field of the internal combustion engine for surface vehicles and electrical generators.  
         BACKGROUND OF THE INVENTION  
         [0003]    The piston engine, dominates the power plant market for cars but it is difficult to redesign a piston engine for stricter air pollution standards, the price of petroleum is crescent, and the good perfomance makes low the engine efficiency at car legal speed.  
           [0004]    The invention is the result of a research to solve these problems.  
           [0005]    The invention, with a similar original cost to the car piston engine, is more efficient than any other known combustion engine, a passenger car can make more than 90 mpg in urban streets or in a highway at 60 mph.  
           [0006]    The invention can use any commercial fuel fluid, especially compressed natural gas.  
           [0007]    The invention is cleaner than any other known combustion engine, oil-free, it uses a catalityc converter and it produces undefiled exhaust emission, it is cooled and cleaned by gas washers and acid control without water consumption.  
         BRIEF SUMMARY OF THE INVENTION  
         [0008]    The invention is an Absolute World Novelty, a new class of positive displacement engine of fast response as the piston engine, and similar to a regenerative combustion turbine of split shaft in speed and appearance.  
           [0009]    The cycle of the invention is also an Absolute World Novelty, it is an open cycle for the air and closed for the water with capacity of modulation from 10% to 100% combined with pressure ratio modulation from 4 to 20, with constant maximum temperature of inlet gas to expanders for any speed or load. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWING  
       [0010]    [0010]FIG. 1 is the diagram of the normal thermal cycle for this invention, the left axis of ordinates is the specific enthalpy, the right axis of ordinates is the absolute temperature, and the axis of abscissas is the specific entropy.  
         [0011]    [0011]FIG. 2 is a schematic diagram showing the relations of component parts of this invention.  
         [0012]    [0012]FIG. 3 is the diagram of the thermal cycle for this invention, for dry starting, idle run, standard run and maximum power, the left axis of ordinates is the specific enthalpy, the right axis of ordinates is the absolute temperature, and the axis of abscissas is the specific entropy. 
     
    
     DETAILED DESCRIPTION  
       [0013]    In FIG. 1, the normal thermal cycle of the invention consists of a welt compression, indicated with  1 - 2 , regenerative heating indicated with  2 - 3 , continuous combustion heating indicated with  3 - 4 , dry expansions indicated with  4 - 5 , reheating for continuous combustion heating indicated with  5 - 6 , dry expansion indicated with  6 - 7 , regenerative catalytic heating indicated with  7 - 8 , regenerative cooling indicated with  8 - 9 , cooling for condensation of water vapor indicated with  9 - 10 , and with outlet exhaust gases to state  1 .  
         [0014]    In FIG. 2, indicated with  1  is the dry air filter, indicated with  2 , is the air screws compressor oil-free of with external synchronized timing gear, this compressor consists essentially of two helical grooved no contact rotors, a male, the driver, four lobes, and one female, six guilles, in a stationary housing with suitable inlet and outled ports, with water injection and combined sliding valve for capacity modulation from 10% to 100% and pressure ratio modulation from 4 to 20, indicated with  3  is the high pressure water separator; in FIG. 2 indicated with  4  the high pressure side of the regenerator, is a heat exchanger that heats the air compressed before combustion with heat rejected by the cycle; indicated with  5 , is the first combustor in which the fuel is burned with primary air and the hot gas is diluted with secondary air for a homogeneous mixture of the outlet gas at constant temperature of 2,500° F., indicated with  6  is the first stage expander, it is a gyratory screws machine with rotors fully synchronized and without contact between screws or housing and screws, this expander drives only the compresor and the accesories, the hot gas escaping in the first expander is recuperated by the second expander, the outlet gas from the first expander indicated with  6 , that goes to the second combustor indicated with  7  or to the catalyzer indicated with  9 , by means of a damper indicated with  19 , in principle the part at high temperature use a stainless steel alloy of iron-cobalt-niquel with coating of alloy of chromium-aluminium-ytrio, the internal cooling is by water at head pressure for bearing and gears box, and by water vaporization in rotors and housing; the second combustor indicated with  7  has steam injection generated by the internal cooling, for inlet run the fuel inyection is cut, the pressure ratio is reduced at minimum, and the damper indicated with  19  is closed, in normal run the outled gas of the second combustor indicated with  7  is of constant temperature, 2,500° F.; indicated with  8  is the second stage expander which drives the outpower shaft, the escaping of hot gas in second expander is recupered by the regenerator; indicated with  9  is a typical catalytic converter for regenerative combustion turbine; indicated with  10  is the low pressure side regenerator; indicated with  11  is an air cooled condenser that recuperated water from water injected and generated by combustion, indicated with  12  is the low pressure water separator; indicated with  13  is the water tank insulated with automatic heater for low temperatures, water filter for the solid removal and to neutralize oxides and acid of sulphur; indicated with  14  is the water pump for the compressor indicated with  2 ; indicated with  15  is the air cooled for the water compressor indicated with  2 ; indicated with  16  is the water injected with the water outlet from cooling of gears, seals, anti-friction ball and roller bearings of compressor indicated with  2 ; indicated with  17  is the water and air outlet from compressor indicated with  2  to separator indicated with  3 ; indicated with  18  is the water control for cooling of expander indicated with  6  and the expander indicated with  8 ; indicated with  19  is the damper valve for idle run; indicated with  20  is a steam separator; indicated with  21  is a water ejector for exhaust gas aspiration from the low pressure side of the regenerator indicated with  10 .