Abstract:
Apparatus and method for determining the clearance and wear of mechanical back-up bearings of turbomachinery utilizing electromagnetic bearings. In order to reduce the prospects of catastrophic failure during a shut-down or loss of electrical power, a rotating apparatus utilizes the electromagnetic bearings to manipulate the shaft to measure the clearance of the mechanical back-up bearings. When power is restored, a programmable controller provides power to the electromagnetic bearings to automatically move the shaft in accordance with a predetermined sequence to contact the mechanical back-up bearings to determine the clearance of the mechanical back-up bearings. These values are stored in the controller memory. The measured clearance is compared to prior clearance measurements of the mechanical back-up bearings to determine the wear of the back-up bearings. The actual wear is compared to the allowable wear for the bearings. If actual wear exceeds a predetermined value, a warning is generated. If the actual wear equals or exceeds the allowable wear, the controller automatically locks the turbomachinery from further operation until repair or replacement is accomplished. Otherwise, the controller centers the shaft to permit normal operation of the turbomachinery.
Abstract:
A heat exchanger (128) is disclosed. The heat exchanger (128) for use in a vapor compression system includes a shell (76), a first partition (146), a first tube bundle (160), a hood (158) and a distributor (80). The first tube bundle (160) includes a plurality of tubes extending substantially horizontally in the shell (76). The first partition (146) divides the shell (76) into at least two separate compartments (150, 152), and the hood (80) is positioned in a first compartment (150) of the at least two compartments. The hood (80) covers the first tube bundle (160). The distributor (80) is configured and positioned to distribute fluid onto at least one tube of the first tube bundle (160).
Abstract:
An heat exchanger (38) for use in a vapor compression system is disclosed and includes a shell (76), a first tube bundle (78), a hood (86) and a distributor (80). The first tube bundle (78) includes a plurality of tubes extending substantially horizontally in the shell (76). The hood (86) covers the first tube bundle (78). The distributor (80) is configured and positioned to distribute fluid onto at least one tube of the plurality of tubes.
Abstract:
Apparatus and methods are provided for cooling motors used to drive gas and air compressors. In particular, the cooling of hermetic and semi-hermetic motors is accomplished by a gas sweep using a gas source located in the low-pressure side of a gas compression circuit. The gas sweep is provided by the creation of a pressure reduction at the compressor inlet sufficient to draw uncompressed gas through a motor housing, across the motor, and out of the housing for return to the suction assembly. The pressure reduction is created by means provided in the suction assembly, such as a nozzle and gap assembly, or alternatively a venturi, located upstream of the compressor inlet. Additional motor cooling can be provided by circulating liquid or another cooling fluid through a cooling jacket in the motor housing portion adjacent the motor.
Abstract:
L'installation couverte pour la pratique de ski ou autre sport de glisse comprend une piste inclinée (1) recouverte d'une couche de neige ou de glace, protégée à l'intérieur d'un hall (2) isolé thermiquement dont l'atmosphère est réfrigérée. Conformément à l'invention, le hall (2) comporte : au moins un passage (4) permettant la communication entre l'intérieur et l'extérieur dudit hall (2), notamment pour l'entrée ou la sortie des usagers et/ou des engins d'entretien; des moyens (10) permettant l'apport d'air neuf dans ledit hall (2), depuis l'extérieur dudit hall (2); des moyens (11) permettant l'extraction de l'air vers l'extérieur dudit hall (2); des moyens (12) permettant la mesure de l'écart de pression entre les zones intérieure et extérieure situées de part et d'autre dudit passage de communication (4); et des moyens de gestion (13) associés auxdits moyens de mesure d'écart de pression (12), qui assurent le pilotage desdits moyens d'apport (10) et d'extraction (11) de sorte à équilibrer ou au moins limiter l'écart de pression entre lesdites zones intérieure et extérieure de part et d'autre dudit passage de communication (4).