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US 9,850,902 B2Granted
Compressor with a bypass port
AssigneeJohnson Controls Technology Company
InventorsPaul Nemit, Jr., Angela Marie Comstock, William L. Kopko
Life of this patent
Estimating the term…
Abstract
A system is provided for adjusting the volume ratio of a screw compressor. The system can use a port in a rotor cylinder to bypass vapor from the compression chamber to the discharge passage of the compressor. A valve can be used to open or close the port to obtain different volume ratios in the compressor.
Claims11
A compressor comprising:
- a compression mechanism, the compression mechanism being configured and positioned to receive vapor from an intake passage and provide compressed vapor to a discharge passage;
- a port positioned in the compression mechanism to bypass a portion of the vapor in the compression mechanism to the discharge passage;
- a valve comprising a valve body positioned in a bore configured and positioned to control vapor flow through the port, the valve body having a first position to unobstructedly permit vapor flow from the compression mechanism to the discharge passage, a second position to prevent vapor flow from the compression mechanism to the discharge passage, and a third position between the first position and the second position to partially permit vapor flow from the compression mechanism to the discharge passage, the valve body in the second position preventing vapor flow by blocking the port without insertion of the valve body inside the port, and the valve body in the third position partially permitting vapor flow by partially blocking the port without insertion of the valve body inside the port;
- the compressor having a first volume ratio in response to the valve body being in the second position, a second volume ratio in response to the valve body being in the first position, and a third volume ratio in response to the valve body being in the third position, the first volume ratio being greater than the second volume ratio and the third volume ratio being between the first volume ratio and the second volume ratio;
- and
- the valve body being automatically positionable using the pressure of the vapor entering the intake passage and the pressure of the compressed vapor discharged from the discharge passage to operate the compressor at the first volume ratio, the second volume ratio or the third volume ratio;
- wherein the valve body is movable in the bore between the first position and the second position in response to a difference in forces applied to opposite ends of the valve body.
4 more elements
A screw compressor comprising:
- a pair of intermeshing rotors, each rotor of the pair of intermeshing rotors being positioned in a corresponding cylinder, the pair of intermeshing rotors being configured to receive vapor from an intake passage and provide compressed vapor to a discharge passage;
- a port positioned in at least one rotor cylinder to bypass a portion of the vapor from a compression pocket formed by the pair of intermeshing rotors to the discharge passage;
- a valve comprising a valve body positioned in a bore configured and positioned to control vapor flow through the port, the valve body having a fully open position to unobstructedly permit vapor flow from the compression pocket to the discharge passage, a closed position to prevent vapor flow from the compression pocket to the discharge passage, and a partially open position to partially permit vapor flow from the compression pocket to the discharge passage, the valve body in the closed position preventing vapor flow by blocking the port without insertion of the valve body inside of the port, the valve body in the partially open position partially blocking the port without insertion of the valve body inside of the port;
- the screw compressor having a first volume ratio in response to the valve body being in the closed position, a second volume ratio in response to the valve body being in the fully open position, and a third volume ratio in response to the valve body being in the partially open position between the closed position and the fully open position, the first volume ratio being greater than the second volume ratio and the third volume ratio being between the first volume ratio and the second volume ratio;
- and
- the valve body being automatically positionable using the pressure of vapor entering the intake passage and the pressure of vapor discharged from the discharge passage to operate the compressor at the first volume ratio, the second volume ratio, or the third volume ratio.
3 more elements
Dependencies are inferred from the claim text.