Abstract:
A multistage dry pump includes a pump housing having plural pump chambers aligned in parallel, a rotational shaft extending along a parallel alignment direction of the plural pump chambers and rotatably supported by the pump housing, and plural rotors parallelly aligned in an axial direction of the rotational shaft and furnished in the respective plural pump chambers. The rotational shaft is formed with a base material of which linear expansion coefficient is less than 6×10−6 m/m·K inclusive, and the respective plural rotors is made of a material which is more easily machined than the material of the rotational shaft.
Abstract translation:多级干式泵包括:泵壳体,其具有平行排列的多个泵室,沿着多个泵室的平行排列方向延伸并由泵壳体可旋转地支撑的旋转轴,以及沿旋转轴线方向平行排列的多个转子 并设置在相应的多个泵室中。 旋转轴形成有线膨胀系数小于6×10 -6 m / m·K的基材,并且各个转子由比旋转轴的材料更容易加工的材料制成。
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:
A scroll type apparatus for fluid displacement is disclosed. In one embodiment, the apparatus includes an adjustment mechanism capable of being adjusted after assembly of the apparatus to close an axial gap between scroll members and account for manufacturing tolerances in apparatus components. In another embodiment, the apparatus includes an orbital scroll of two portions, with a supporting portion surrounding an eccentric bearing of higher density than that of a scroll portion. The center of mass of the orbital scroll is thus moved towards the eccentric bearing to reduce torquing of the scroll as it orbits. In a further embodiment, the apparatus includes an orbital scroll having two portions, a supporting portion surrounding an eccentric bearing having a lower coefficient of thermal expansion than that of a scroll portion, to reduce thermal expansion of the supporting portion, reducing misaligmnent of the eccentric orbital scroll on the bearing.
Abstract:
The present invention is to provide a refrigerant compressor comprising a compressing element driven by a rotary shaft, for compressing and discharging a sucked HFC type refrigerant or refrigerant mainly comprising the HFC type refrigerant by the compressing element, where a rotary shaft applied with the plasma sulphonitriding treatment on the surface is used as the rotary shaft. Or a vane applied with the plasma sulphonitriding treatment on the surface of a vane made of a steel equivalent to a high speed tool steel vane or a steel equivalent to a stainless steel is used. Accordingly, a refrigerant compressor comprising a rotary shaft or a vane having a low friction coefficient in a sliding portion on the surface of the rotary shaft or the vane and a high wear resistance can be provided even in the case an ester type refrigerator oil or an ether type refrigerator oil is used as the refrigerator oil and an HFC type refrigerant is used.
Abstract:
A screw-type rotary fluid machine such as a compressor or a vacuum pump has male and female rotors which rotate within a casing, with or without mutual contact. At least one of the male and female rotors being surface-treated to have a treated surface structure. The treated surface structure is a multi-layered structures composed of a plurality of layers including a non-electrolytic Ni plating layer and at least one covering layer of organic resin. The organic resin may be one or more kinds selected from a group of engineering plastics, so as to improve mechanical strength.
Abstract:
A multiple speed fluid motor includes a housing having an inlet port for receiving high pressure fluid and an exhaust port for exhausting low pressure fluid, and a gerotor gear set. An output shaft is supported for rotation relative to the housing. One of the gerotor gears is coupled with the output shaft for rotating the output shaft in response to fluid being supplied to the inlet port. The motor includes fluid passages for conducting fluid to the fluid displacement means. A control valve member is movable to control fluid flow through the fluid passages to control the rotational speed of the output shaft. The control valve member is mounted in a valve chamber defined by a plurality of plates.
Abstract:
A sliding member of an iron-based non-porous material, such as vane, of a rotary compressor has a sliding surface processed by a surface treatment in which the surface is subjected to oxidizing and nitriding to form an oxidized and nitrided layer thereon. The surface is then subjected to a steam-treatment in which water is caused to react with components of the oxidized and nitrided layer to form a layer of oxidized iron of a porous network structure disposed outwardly of the oxidized and nitrided layer. The oxidized iron layer is composed mainly of tri-iron tetroxide and softer than the oxidized and nitrided layer.
Abstract:
A rotary abutment type hydraulic motor is disclosed comprising a housing having a rotor chamber and a pair of abutment valve chambers intersecting the rotor chamber. A rotor having at least three lobes is disposed in the rotor chamber, and a two lobed stator is provided in each of the abutment valve chambers. The abutment valve axes are circumferentially spaced apart one-half the angular spacing between adjacent rotor lobes. A unique sealing arrangement is provided between the rotor lobes and rotor chamber wherein sealing pins carried by the rotor lobes are hydraulically displaced radially outwardly to sealingly engage the inner surface of the rotor chamber during motor operation. A unique abutment valve lobe rotor hub sealing arrangement is also provided which is defined by a metal plate extending between adjacent rotor lobes and hydraulically displaceable metal pins disposed beneath the plate in recesses in the rotor hub. Hydraulic fluid under pressure biases the pins outwardly against the plate to bias the plate into sealing engagement with the abutment valve lobes during interengagement therebetween. Opposite ends of the abutment valve shafts are provided with a floating bearing and seal arrangement which is responsive to hydraulic fluid under pressure to seal the shaft ends against leakage of hydraulic fluid thereacross.
Abstract:
An improved rotor and gear assembly for rotary mechanisms of the trochoidal type, in which a rotor having a central bore is mounted for rotation on a shaft, with a bearing between the rotor bore and the journal portion of the shaft. An internally toothed ring gear is secured to a side face of the rotor for engagement with a stationary spur gear to maintain phasing between the rotor and its trochoidal housing during the planetary and rotary motion of the rotor within the housing. The ring gear is mounted on the rotor in such a manner as to maintain concentricity therewith while permitting differences in thermal expansion between the materials of the rotor and the gear, and without imposing stress on the mounting means or the bearing without causing distortion in the gear or the rotor.
Abstract:
Parallel pump shafts are inter-geared to rotate in opposite directions having 90* offset arcuate heads of crescent form as in Roots pumps, the periphery of each head having a close approach to a bearing support for the opposing head, there being a unique port design which permits axial and radial flow into the area where volumes are being created and destroyed, the object being to eliminate undesirable hydraulic effects, particularly cavitation.