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US 2008/0304990 A1Published application
Screw Compressor
AssigneeJohnson Controls Denmark Aps
InventorLars Skovlund Andersen
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AssigneeJohnson Controls Denmark Aps
InventorLars Skovlund Andersen
Estimating the term…
The present invention relates to a screw compressor and a method for operating the compressor primarily for gaseous refrigerants, comprising a compressor housing, which comprises a male and a female screw rotor arranged in screw rotor bores in the compressor housing, which male and female rotor are co-rotatingly drivable and interacting for compressing the refrigerant, which screw compressor comprises at least one slider, which slider is movable in relation to the male and the female rotor, where movement of the slider controls the internal volume ratio of the screw compressor, which slider is moveable in a slider housing, which slider is in a direction sideways to the plane formed by the rotational axes of the male and the female rotor, which slider is interacting with the male and the female rotor. It is the object of the invention to develop a highly effective screw compressor, which screw compressor can regulate the discharge pressure. This can be achieved by a screw compressor as described in the opening paragraph if the slider comprises at least two surfaces, which surfaces are cooperating with subsequent surfaces placed in conjunction with the slider housing for controlling the angular and linear placement of the slider in its forward position. It can hereby be achieved that independent pressure volumes formed between the male and the female rotor during the interaction of the rotors are connected to the discharge before the last compression takes place, when this slider is moved away from its forward position. This will lead to a reduction of the discharge pressure of the compressor.
A screw compressor primarily for gaseous refrigerants, comprising a compressor housing, which comprises a male and a female screw rotor arranged in screw rotor bores fin the compressor housing, which male and female rotor are co-rotatingly drivable and interacting for compressing the refrigerant, which screw compressor comprises at least one slider, which slider is movable in relation to the male sand the female rotor, where movement of the slider controls the internal volume ratio of the screw compressor, which slider is moveable in a slider housing, which slider is operating in a direction sidewards to the plane formed by the rotational axes of the male and the female rotor, which slider is operating adjacent to the rotors at a minimum amount of play towards the male and the female rotor, wherein the compressor comprises discharge end plates, which discharge endplates are place between the discharge end of the male and female screw rotors and the end plate of the compressor housing, which discharge end plates comprises a discharge opening, which discharge end plates comprise discharge end walls, where the slider comprises at least two areas, which areas are cooperating with subsequent areas placed in conjunction with the discharge end walls for controlling the angular and linear placement of the slider for avoiding rotor contacts.
Method for controlling the discharge of a screw compressor, which compressor comprises a male and a female screw rotor arranged in screw rotor bores in the compressor housing, which male and female rotor are co-rotatingly drivable and interacting for compressing the refrigerant, where a slider is moved in relation to the male and the female rotor from a sideways direction, which direction deviates several degrees from the axes of rotation of the male and the female rotor, which slider is operable for controlling the discharge of the compressor, wherein a discharge opening is formed in discharge endplates, where the discharge endplates comprises discharge end walls, where the slider comprises guiding areas which areas interacts with corresponding areas placed in conjunction with the discharge end wall for controlling the angular and linear placement of the slider when the slider is operating adjacent to the rotors at a minimum amount of play towards the male and the female screw rotor.
Method for controlling the discharge of a screw compressor according to claim 18, wherein the slider is controlled by one mechanical stop, when the slider is placed in a position for increasing the discharge pressure of the compressor.
Dependencies are inferred from the claim text.