Abstract:
The present invention provides a hermetic or open compressor for hydrocarbon refrigerant having high reliability. According to the present invention, in the compressor using hydrocarbon as refrigerant, synthetic oil such as polyalkylene glycol oil, ester oil or ether oil is used as freezer oil. Sliding member of the compressor includes both a portion made of aluminum material and a portion made of iron material. Therefore, it is possible to realize a compressor having excellent wear resistance and high reliability.
Abstract:
The present invention overcomes deficiencies in the prior art by providing a centrifugal pump which conforms to ANSI standards, is reversible, is efficient, is self priming, has low flow stability and low radial thrust characteristics, handles viscous fluids well, and can pump fluid within a high range of pressure values. Such a pump configuration provides an easy way to retrofit problem applications, an attractive cost effective solution for the new installations, and ensures dimensional interchangeability of the pump, for ease of replacement, spare parts inventory, and standardization of maintenance techniques
Abstract:
A bearing having a valve seat for a rotary compressor which is made of austenitic cast iron with graphite crystallized in an austenite matrix in the form of an A type, C type or A/C combined type under the ISO classification, maximum length crystallized graphite being in a range of 0.45 to 1.4 mm.
Abstract:
A valved body for a hermetic motor-compressor for refrigerant fluids, such as a shaft support for a rotary-ring compressor, is constituted by a metal part comprising a wall, such as a flange, which adjoins a compression chamber for the fluid and has a fluid discharge port controlled by an automatic discharge valve. The wall has a through seats and the discharge valve comprises essentially:a cup-shaped insert of sintered steel, housed in the seat and comprising a peripheral skirt and an end wall located on the side nearer the compression chamber, with a central aperture constituting the discharge port and with an annular sealing rib surround the opening of the port within the cup,a cover applied and fixed to the cup-shaped insert on the outer face of the wall and having outlet openings for the fluid from the cavity of the insert,a disc obturator housed and guided within the insert so as to leave a passage for the fluid between the periphery of the obturator itself and the peripheral skirt of the insert, and cooperating with the sealing rib, anda disc spring interposed between the obturator and the cover for thrusting the obturator against the annular rib.
Abstract:
An apex seal for a rotary piston engine, the apex seal being made of cast iron and having an elongated shape, a roundish sliding surface, the upper portion (including the sliding surface) with a chilled structure containing a large proportion of cementite and the lower portion with at least one-third of the height of the seal and with no chilled structure; and a method of producing the same.
Abstract:
Disclosed is an air compressor (10) for supplying compressed air to a pneumatic system in a motor vehicle. The air compressor (10) comprises a crankcase (46), a cylinder housing (14) connected to the crankcase, a cylinder head (20), a crankshaft (40) rotatably mounted in the crankcase, a cylindrical piston (12) that is connected to the crankshaft (40) by a connecting rod (42). In order to load the compressed air with as little heat as possible, the crankcase (46), the cylinder housing (14), the cylinder head (20), and the piston (12) are made of aluminum or an aluminum alloy, and the at least one piston ring (54) or the at least one oil ring is made of gray cast iron or polytetrafluoroethylene (PTFE).