Abstract: A method of treating, tuning, assembling, and/or overhauling a twin rotor device includes applying a coating material on an internal set of working surfaces of the twin rotor device when at least partially assembled. The coating may be factory or field applied to a new or used twin rotor device. The working surfaces may be uncoated or previously coated and may be built-up as the coating material forms a coating on at least some of the working surfaces. Manufacturing variations of a pair of rotors and a housing may be compensated by the coating. One or more performance characteristics of the twin rotor device may be improved by the coating, and variation between a series of twin rotor device may be reduced or substantially eliminated. The coating may reduce internal leakage and increase volumetric efficiency of the twin rotor device. The twin rotor device may be a supercharger 200, a screw compressor 1200, or other twin rotor device.

Abstract: A method of treating, tuning, assembling, and/or overhauling a twin rotor device (200, 1200) includes applying a coating material (102) on an internal set of working surfaces (218, 222, 224, 226, 228, 1218, 1222, 1224, 1226, 1228) of the twin rotor device when at least partially assembled. The coating may be factory or field applied to a new or used twin rotor device. The working surfaces may be uncoated or previously coated and may be built-up as the coating material forms a coating (206, 1206) on at least some of the working surfaces. Manufacturing variations of a pair of rotors (220, 1220) and a housing (210, 1210) may be compensated by the coating. One or more performance characteristics of the twin rotor device may be improved by the coating, and variation between a series of twin rotor device may be reduced or substantially eliminated. The coating may reduce internal leakage and increase volumetric efficiency of the twin rotor device.

Abstract: A supercharger outlet resonator comprises a housing, a first surface comprising a first opening and a housing axis bisecting the first opening, and a second surface comprising a second opening, the second surface located parallel to the first surface. A channel is perpendicular to the housing axis and connects the first opening to the second opening. The channel comprises at least one sidewall. An envelope is fluidly separated from the channel by the at least one sidewall, the envelope at least partially surrounds the channel, and the envelope extends from the first surface to the second surface. The envelope comprises a third opening and at least one second sidewall. A noise-reducing material located on the housing.

Abstract: The present teachings include an energy recovery device usable in multiple applications, for example hydropower and vehicle power plant applications. In one aspect, an energy recovery device includes a housing having an inlet and an outlet in fluid communication with an internal cavity, and a pair of counter-rotating rotors having intermeshed lobes disposed within the housing internal cavity. Each rotor defines a transport volume between the housing and a pair of adjacent lobes and has a calculated maximum ideal twist angle below which the transport volume will be sealed from both the housing inlet and housing outlet. Each rotor also has an actual twist angle that exceeds the maximum ideal twist angle.

Abstract: A gear pump for power generation comprises a first rotor and a second rotor in a case. The first rotor comprises a first plurality of radially spaced teeth, wherein the first plurality of radially spaced teeth wrap around the first rotor helically in a clockwise direction, and wherein at a first position the first plurality of radially spaced teeth have a helix angle different than the helix angle of the first plurality of radially spaced teeth at a second position. The second rotor comprises a second plurality of radially spaced teeth, wherein the second plurality of radially spaced teeth wrap around the second rotor helically in a counter-clockwise direction, and wherein at a first position the second plurality of radially spaced teeth have a helix angle different than the helix angle of the second plurality of radially spaced teeth at a second position.

Abstract: A supercharger outlet resonator comprises a housing, a first surface comprising a first opening and a housing axis bisecting the first opening, and a second surface comprising a second opening, the second surface located parallel to the first surface. A channel is perpendicular to the housing axis and connects the first opening to the second opening. The channel comprises at least one sidewall. An envelope is fluidly separated from the channel by the at least one sidewall, the envelope at least partially surrounds the channel, and the envelope extends from the first surface to the second surface. The envelope comprises a third opening and at least one second sidewall. A noise-reducing material located on the housing.

Abstract: A method of treating, tuning, assembling, and/or overhauling a twin rotor device (200, 1200) includes applying a coating material (102) on an internal set of working surfaces (218, 222, 224, 226, 228, 1218, 1222, 1224, 1226, 1228) of the twin rotor device when at least partially assembled. The coating may be factory or field applied to a new or used twin rotor device. The working surfaces may be uncoated or previously coated and may be built-up as the coating material forms a coating (206, 1206) on at least some of the working surfaces. Manufacturing variations of a pair of rotors (220, 1220) and a housing (210, 1210) may be compensated by the coating. One or more performance characteristics of the twin rotor device may be improved by the coating, and variation between a series of twin rotor device may be reduced or substantially eliminated. The coating may reduce internal leakage and increase volumetric efficiency of the twin rotor device.

Abstract: A gear pump unit for hydroelectric power generation comprises a generator (138) and a control module operatively connected to a gear pump (131). The gear pump (131) comprises a case (131B) with a fluid inlet (132) and an outlet (135). A first rotor (133) comprises a first plurality of radially spaced teeth (133A, 133B, 133C) that wrap around the first rotor helically in a clockwise direction. A second rotor (134) comprises a second plurality of radially spaced teeth (134A, 134B, 134C) that wrap around the second rotor helically in a counter-clockwise direction. The first plurality of teeth mesh with the second plurality of teeth. The gear pump unit operates in a pump, turbine, or siphon mode via the control module 150 selectively rotating the first and second rotors. Electricity is generated by coupling the rotational energy of the first and second rotors to the generator (138).

Abstract: A Roots-type supercharger 100, 1100 includes a housing 120, 1120, a first rotor 200, a second rotor 300, an outlet volume 400, a transfer volume 500, and a bleed port 600, 600?, 1600. The housing includes an interior chamber 130, an inlet port 140, and an outlet port 150, 1150. The first rotor 200 and the second rotor 300 have a plurality of lobes 210, 310, respectively. The outlet volume 400 is substantially bounded between the outlet port, the first rotor, the second rotor, and the interior chamber of the housing. The transfer volume 500 is substantially bounded between the first rotor, the second rotor, and the interior chamber of the housing. The bleed port 600, 600?, 1600 is adapted to fluidly connect the outlet volume and the transfer volume at least during a portion of a transfer volume cycle. The variable bleed port may include a plate that pivots about a pivot or slides along a slide. The plate may be arc shaped and may arc around a centerline of one of the rotors.