Abstract:
A hemispherical shoe (sliding member) 1 has a flat sliding surface 3, which is quenched to form a quenched portion 7. A part of the quenched sliding surface is partially annealed to form an annealed portion 6. When an oil film pressure acts on the sliding surface 1, the annealed portion 6 is deformed by pressure so that the surface thereof has a concave portion 6A. In the annealed portion 6, a remaining quenched portion 8 may remain at the center part thereof. The concave portion 6A can be used as an oil reservoir or an oil flow path, so that an excellent seizure resistance can be ensured.
Abstract:
A vapor compression system includes a compressor, a condenser, an expansion device and an evaporator. Refrigerant circulates though the closed circuit vapor compression system. Touchdown bearings protect a rotor during power shutdown of the compressor. Liquid refrigerant from the condenser flows along a supply line and lubricates the touchdown bearings. The refrigerant from the touchdown bearings is discharged through an outlet and flows along a discharge line to the evaporator.
Abstract:
Disclosed are an anti-abrasion device and a reciprocating compressor having the same, whereby a sleeve is fabricated with an outer diameter smaller than an inner diameter of a connecting rod to be non-press-fitted, thereby facilitating an assembly of the sleeve, and also the deformation of an inner diameter of the sleeve is prevented during the assembly of the sleeve, thereby preventing beforehand an increase in an input load of a motor unit due to the deformation of the sleeve and an abrasion of a pin of a crankshaft.
Abstract:
An air refrigerant cooling apparatus has magnetic bearings with high reliability and high efficiency. The air refrigerant cooling apparatus includes a motor having a first magnetic bearing and a second magnetic bearing for supporting a shaft, a compressor and an expansion turbine. The compressor is connected to the shaft and separated from the first magnetic bearing by a first labyrinth. The expansion turbine is connected to the shaft and separated from the second magnetic bearing by a second labyrinth. Pressure differences are generated between spaces where the first magnetic bearing and the second magnetic bearing are provided and respective inlet of the compressor and outlet of the expansion turbine by an external pressure outside the motor.
Abstract:
An object of the present invention is to provide an air refrigerant cooling apparatus having magnetic bearings with high reliability and high efficiency. In the present invention, magnetic bearings are applied to a motor of an air refrigerant cooling apparatus which includes a compressor, the motor and an expansion turbine. To remove contamination moving into the inside of the motor from the outside through a labyrinth, a pressure difference is generated between the inside of the motor and the compressor. Thus, high-speed rotation is kept, and an air refrigerant cooling apparatus with high reliability and high efficiency can be attained. Provided near the magnetic bearings are sensors for detecting positions of the shaft in the radial and the axial directions. To prevent the sensors from being exposed to the air refrigerant leaked from the compressor and the expansion turbine through labyrinth, a pressure difference is also generated between the space where the sensors are provided and the outside of the motor. Thus, the sensor operation is stabilized. An air refrigeration system having high reliability and high efficiency with a simple configuration is attained by incorporating the air refrigerant cooling apparatus into a refrigeration system.
Abstract:
A bearing assembly (42A) includes a shaft (90A) and a thrust runner (68A) attached to the shaft (90A). The shaft runner protrudes radially outward from the shaft. A thrust bearing (66A) is positioned axially adjacent to the thrust runner (68A). A first flow passage (86A) is between the thrust runner (68A) and a first face (74A) of the thrust bearing (66A). A second flow passage (88A) is between a second face (76A) of the thrust bearing (66A) and a housing (70A). A restriction feature (98A) restricts a flow of fluid through the second flow passage (88A).
Abstract:
Disclosed are a magnetic bearing and a centrifugal compressor. The magnetic bearing comprises a revolving shaft (110) and an electromagnetic component, wherein the electromagnetic component is arranged around an outer periphery of the revolving shaft (110), and a gap is formed between the electromagnetic component and the revolving shaft (110) for adjusting a position of the revolving shaft (110). The electromagnetic component comprises an iron core (120) with a winding slot, and coils (150). The coils (150) are arranged in the winding slot. The magnetic bearing (100) also comprises a protection mechanism (140), which is configured to prevent the revolving shaft (110) from colliding with the electromagnetic component, thereby achieving the purpose of axially protecting the magnetic bearing (100). The centrifugal compressor comprises the magnetic bearing (100), thereby obtaining axial protection and prolonging service life.