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US 11,118,585 B2Granted
Screw compressor with oil injection at multiple volume ratios
AssigneeIngersoll-Rand Industrial U.S., Inc.
InventorsDaniel R. Crum, Ryan Patrick Coleman, Nobin Cherian
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Abstract
The present disclosure is directed to a screw compressor system having a compressor housing with a pair of screw rotors rotatably supported within a compression chamber. Lubricant is injected into a compression chamber at a first volume ratio and at a second volume ratio greater than the first volume ratio to increase the sealing and lubrication between the screw rotors and rotor bores in the compressor housing as well as to increase heat transfer from a compressed working fluid in the compression chamber.
Claims18
A compressor comprising:
- a compressor housing;
- a compression chamber defined by an inner bore and first and second ends of the compressor housing, the inner bore extending between the first and second ends of the compressor housing;
- an inlet port upstream of the compression chamber;
- a discharge port downstream of the compression chamber;
- male and female screw rotors rotatably meshed together within the compression chamber, the male and female screw rotors operable for compressing a working fluid;
- a compression pocket defined by a region in the compression chamber that is sealed from the inlet port and the discharge port;
- a volume ratio defined within the compression pocket, the volume ratio varying between 1.0 at an entrance region proximate the first end of the compression chamber and a design maximum volume ratio at an exit region proximate the second end of the compression chamber;
- a first lubricant injector in fluid communication with a first discharge orifice defined between the first and second ends and in the inner bore of the compressor housing, the first lubricant injector configured to inject lubricant into the compression chamber through the inner bore at a first volume ratio;
- a second lubricant injector in fluid communication with a second discharge orifice defined between the first and second ends and in the inner bore of the compressor housing, the second lubricant injector configured to inject lubricant into the compression chamber through the inner bore at a second volume ratio, wherein the second volume ratio is larger than the first volume ratio;
- and
- a main lubricant gallery formed in the compressor housing and a main lubricant inlet connected to the main lubricant gallery, the main lubricant inlet in fluid communication with a source of lubricant;
- wherein the first and second lubricant injectors are fluidly coupled with the main lubricant gallery through respective first and second axial galleries extending from the main lubricant gallery, the first and second lubricant injectors each define a passageway from the respective first and second axial galleries into the compression chamber to direct lubricant from the main lubricant inlet into the compression chamber.
9 more elements
A screw compressor comprising:
- a compressor housing;
- a compression chamber defined by an inner bore and first and second ends of the compressor housing, the inner bore extending between the first and second ends of the compressor housing;
- an inlet port upstream of the compression chamber;
- a discharge port downstream of the compression chamber;
- male and female screw rotors rotatably meshed together within the compression chamber, the male and female screw rotors operable for compressing a working fluid;
- a compression pocket defined by a region in the compression chamber that is sealed from the inlet port and the discharge port;
- a first lubricant injector port in fluid communication with a first discharge orifice defined between the first and second ends and in the inner bore of the compressor housing, the first lubricant injector configured to inject lubricant into the compression chamber through the inner bore at a first volume ratio;
- a second lubricant injector port in fluid communication with a second discharge orifice defined between the first and second ends and in the inner bore of the compressor housing, the second lubricant injector configured to inject lubricant into the compression chamber through the inner bore at a second volume ratio, wherein the second volume ratio is larger than the first volume ratio;
- and
- a main lubricant gallery extending radially between the male and female rotors;
- and
- first and second axial lubricant galleries formed in the compressor housing and extending from the main lubricant gallery to the first lubricant injector port and to the second lubricant injector port, respectively.
9 more elements
A method of operating a compressor comprising:
- compressing a working fluid in a compression chamber with a meshed pair of male and female screw rotors, the compression chamber defined by an inner bore and two opposing ends of a compressor housing;
- injecting lubricant through a first discharge orifice defined between the two opposing ends and in the inner bore of the compressor housing, the lubricant injected through the first discharge orifice into the compression chamber at a first volume ratio;
- injecting lubricant through a second discharge orifice defined between the two opposing ends and in the inner bore of the compressor housing, the lubricant injected through the second discharge orifice into the compression chamber at a second volume ratio, the second volume ratio being greater than the first volume ratio;
- wherein the injecting lubricant into the compression chamber at a first volume ratio includes flowing lubricant into a main lubricant gallery within the compressor housing which encloses the pair of male and female screw rotors, and subsequently flowing lubricant from the main lubricant gallery into an axial lubricant gallery also formed within the compressor housing, the axial lubricant gallery feeding a lubricant injector.
1 more element
Dependencies are inferred from the claim text.