Rotary screw engine having adjustable internal feed and adjustable outlet control

Claim 2

A rotary screw type engine having a casing and in which cooperative and interengaging male and female rotors rotate to define an expansion chamber, one of said rotors having an internal inlet port in and adjacent one end for conducting high pressure fluid to said chamber, a piston type control valve member located centrally within and in concentric alignment with one of said rotors and having a feed port registerable with said rotor inlet port, said valve member being slideable axially between a feeding position in which said valve member feed port is aligned with said rotor inlet port and a position closed in which said ports are not in registry, means for equalizing pressure on each end of said valve member, a high pressure vapor inlet passage means extending from outside said casing and to said valve member feed port for conducting high pressure vapor thereto for charging said expansion chamber with vapor when said valve member is moved to said feeding position, and an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber.

Claim 3

A rotary screw type engine having a casing and in which cooperative anD interengaging male and female rotors rotate to define an expansion chamber, one of said rotors having a central bore, an inlet port in and adjacent one end of said one rotor and located between said bore and said chamber, a control piston having an open interior and slideable in said bore and also having a feed port extending from its interior and through its periphery, said feed port registerable with said rotor inlet port, said piston being axially slideable in said rotor between (1) a feeding position in which said piston feed port is aligned with said rotor inlet port and (2) a closed position in which said ports are not in registry, means for equalizing pressure on each end of said piston, a discharge outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, and a high pressure vapor inlet passage means extending into the interior of said piston for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said piston feed port when said piston is moved to said feeding position.

Claim 4

A rotary screw type engine having a casing and in which cooperative anD interengaging male and female rotors rotate to define an expansion chamber, one of said rotors having a central bore, an inlet port in and adjacent one end of said one rotor and located between said bore and said chamber, a control piston having an open interior and slideable in said bore and also having a feed port extending from its interior and through its periphery, said feed port registerable with said rotor inlet port, said piston being axially slideable in said rotor between (1) a feeding position in which said piston feed port is aligned with said rotor inlet port and (2) a closed position in which said ports are not in registry, means for equalizing pressure on each end of said piston, a discharge outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, and a high pressure vapor inlet passage means extending into the interior of said piston for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said piston feed port when said piston is moved to said feeding position.

Claim 5

An elastic fluid operated rotary engine having a casing, cooperative and interengaging male and female rotors rotatable in said casing to define therewith an expansion chamber, one of said rotors having a generally centrally located inlet port in and adjacent one end and extending into communication with said chamber, a shiftable control valve member having a feed port registerable with said rotor inlet port, said valve member being shiftable between a feeding position in which said valve member feed port is aligned with said rotor inlet port and a position closed in which said ports are not in registry, a high pressure vapor inlet passage means extending into the interior of said piston for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said valve member feed port whcn said valve member is moved to said feeding position, an equalizing port in said valve member and also registerable with said rotor inlet port, and an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, said valve member equalizing port being in communication with said exhaust outlet, when said valve member feed port is moved to the closed position, whereby the expansion chamber of said rotors can be vented via said valve member equalizing port directly to said exhaust outlet.

Claim 6

An elastic fluid operated rotary engine having a casing, cooperative and interengaging male and female rotors rotatable in said casing to define therewith an expansion chamber, one of said rotors having a generally centrally located inlet port in and adjacent one end and extending into communication with said chamber, a shiftable control valve member having a feed port registerable with said rotor inlet port, said valve member being shiftable between a feeding position in which said valve member feed port is aligned with said rotor inlet port and a position closed in which said ports are not in registry, a high pressure vapor inlet passage means extending into the interior of said piston for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said valve member feed port whcn said valve member is moved to said feeding position, an equalizing port in said valve member and also registerable with said rotor inlet port, and an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, said valve member equalizing port being in communication with said exhaust outlet, when said valve member feed port is moved to the closed position, whereby the expansion chamber of said rotors can be vented via said valve member equalizing port directly to said exhaust outlet.

Claim 7

A rotary screw type engine having a casing and in which cooperative and interengaging male and female rotors rotate to define an expansion chamber, one of said rotors having a central bore, an inlet port in and adjacent one end of said one rotor and located between said bore and said chamber, a control piston having a hollow interior and slideable in said bore, said piston having a feed port extending through its periphery from its interior, said feed port registerable with said rotor inlet port, said piston being axially slideable in said rotor between a feeding position in which said piston feed port is aligned with said rotor inlet port and a position closed in which said ports are not in registry, an equalizing port in said piston and also registerable with said rotor inlet port, an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, said piston equalizing port being in communication with said exhaust outlet when said feed port is in a closed position, whereby the expansion chamber of said rotors can be vented via said piston equalizing port directly to said exhaust outlet, and a high pressure vapor inlet passage means extending into the interior of said piston for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said piston feed port when said piston is moved to said feeding position.

Claim 8

A rotary screw type engine having a casing and in which cooperative and interengaging male and female rotors rotate to define an expansion chamber, one of said rotors having a central bore, an inlet port in and adjacent one end of said one rotor and located between said bore and said chamber, a control piston having a hollow interior and slideable in said bore, said piston having a feed port extending through its periphery from its interior, said feed port registerable with said rotor inlet port, said piston being axially slideable in said rotor between a feeding position in which said piston feed port is aligned with said rotor inlet port and a position closed in which said ports are not in registry, an equalizing port in said piston and also registerable with said rotor inlet port, an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, said piston equalizing port being in communication with said exhaust outlet when said feed port is in a closed position, whereby the expansion chamber of said rotors can be vented via said piston equalizing port directly to said exhaust outlet, and a high pressure vapor inlet passage means extending into the interior of said piston for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said piston feed port when said piston is moved to said feeding position.

Claim 9

A rotary screw type engine having a casing in which cooperative and interengaging male and female rotors rotate to define an expansion chamber, said rotors each having a central bore, an inlet port in and adjacent one end of each of said rotors and located between said bores and said chamber, a control piston having a hollow interior and slideable in each of said bores and also having a feed port registerable with its respective rotor inlet port, said pistons being axially slideable in their respective rotor between a feeding position in which their piston feed port is aligned with its respective rotor inlet port and a position closed in which said ports are not in registry, a high pressure vapor inlet passage means extending into the interior of said pistons for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said piston feed ports when said pistons are moved to said feeding position, an equalizing port in each of said pistons and also registerable with its respective rotor inlet port, an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, said piston equalizing ports being in communication with said exhaust outlet when said feed ports are in the closed position, whereby the expansion chamber of said rotors can be vented via said piston equalizing ports directly to said exhaust outlet, a control stem for each of said pistons, and means for causing said pistons to move in unison.

Claim 10

A rotary screw type engine having a casing in which cooperative and interengaging male and female rotors rotate to define an expansion chamber, said rotors each having a central bore, an inlet port in and adjacent one end of each of said rotors and located between said bores and said chamber, a control piston having a hollow interior and slideable in each of said bores and also having a feed port registerable with its respective rotor inlet port, said pistons being axially slideable in their respective rotor between a feeding position in which their piston feed port is aligned with its respective rotor inlet port and a position closed in which said ports are not in registry, a high pressure vapor inlet passage means extending into the interior of said pistons for conducting high pressure vapor thereto for charging said expansion chamber with vapor via said piston feed ports when said pistons are moved to said feeding position, an equalizing port in each of said pistons and also registerable with its respective rotor inlet port, an exhaust outlet in said casing and located at the other end of said rotors for discharging fluid from said expansion chamber, said piston equalizing ports being in communication with said exhaust outlet when said feed ports are in the closed position, whereby the expansion chamber of said rotors can be vented via said piston equalizing ports directly to said exhaust outlet, a control stem for each of said pistons, and means for causing said pistons to move in unison.