Screw rotor mechanism

Details Screw rotor mechanism Screw rotor mechanism

1986-07-10

1987-09-22

Croyle, Carlton R.

Rotary expansible chamber devices

Heat exchange or non-working fluid lubricating or sealing

418178, 418201, 74458, 744245, F04C 1816, F04C 2900

Patent

active

046952330

ABSTRACT:
A pair of dry-sealed screw rotors for compressors which includes rotor tooth profiles in which an inter-tooth gap at a profile point on male and female rotor of a normal temperature is determined by an amount of interference due to thermal expansion caused during the operation of the compressors and an amount of minimum safety clearance necessary for the operation. The inter-tooth gap is further determined by a total thickness of seal coatings applied to the peripheral surfaces of the rotors at a profile point at which the thus determined gap is smaller than the total thickness of seal coatings. With the thus shaped rotor teeth, a most preferable seal line is achieved so as to produce an improved compression efficiency.

REFERENCES:
patent: 4475878 (1984-10-01), Kasuya

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