Abstract: A rotor for a rotary compressor having a metal central portion integral with two opposite end portions that are fiber-reinforced metal matrix composites having a matrix metal common to the central portion. Such rotors may be made by pressing inorganic fibers to form the end portions of the rotor, arranging the end portions in an opposing relationship in a mold to form the central portion between the end portions. Molten metal is placed into the mold such that it infiltrates the porous end portions while forming the central portion. Solidification of the metal forms fiber-reinforced metal-matrix composite end portions integral with the central portion.

Abstract: Bearing apparatus for movable vane compressor is provided with a pressure-reducing passage extending from an annular clearance between the inner side surface of the bearing and the side surface of the rotor to the open air or the like, such as the suction-chamber and the suction-working space. Compressed air enters the annular clearance through a gap between the inner side surface of the side housing and the side surface of the rotor from the compression-working space between two adjacent vanes and then runs out through the pressure-reducing passage without pushing the bearing grease from the bearing.

Abstract: A method of manufacturing a rotor for rotary fluid pumps comprising the steps of assembling a hollow cylindrical body and both side plates to a hollow rotor body, providing the hollow rotor body with a plurality of sockets each receiving a separately fabricated U-shaped vane-groove forming member, and inserting the U-shaped vane-groove forming members into the respective sockets to fix the same to the rotor body by brazing. The U-shaped vane-groove forming member is made from a suitable material as a vane groove itself and sufficiently finished independently from the rotor body.

Abstract: A rotary compressor provided with a rotary sleeve mounted in a center housing for rotation with a plurality of vanes radially slidably fitted in a rotor which is eccentrically disposed in the rotary sleeve, and an air bearing room defined between the outer periphery of the rotary sleeve and the inner periphery of the center housing and internally connected to compressed air in the compressor, characterized in that a multiplicity of air-accumulating grooves are formed in either or both of the outer periphery of the rotary sleeve and the inner periphery of the center housing to increase the bearing capacity of the air-bearing room and prevent the rotary sleeve from directly contacting the inner periphery of the center housing even if the high-pressure in the rotary sleeve pushes aside the rotary sleeve.

Abstract: Apparatus in a vane type rotary compressor for floatingly supporting a rotary sleeve which is mounted in a center housing for rotation with a plurality of vanes movable in a rotor, the apparatus comprising an air-bearing room defined between the inner periphery of the center housing and the outer periphery of the rotary sleeve and supplied with the maximum-pressure or discharge-pressure air through an air-supply passage extending from the discharge chamber or compression working space under the maximum pressure. The air-supply passage is formed with an accumulator for reducing the pulsations and/or temperature of the supplied air. The accumulator is composed of either or both of a relatively large hollow in the thickened wall of the center housing and a plurality of fine bores and alternative grooves forming a S-shaped hole in the suction side wall.

Abstract: A hollow rotor for movable vane pumps and the like having a pair of right and left cup-shaped bodies each being separately shaped from steel or aluminum alloy in the form similar to either of axially bisected parts of a complete rotor. The right and left cup-shaped bodies have the respective open side faces abutted and joined to each other by butt resistance welding to be incorporated into the complete hollow rotor.

Abstract: A rotary compressor is provided with a rotary sleeve mounted in a center housing for rotation with a plurality of vanes movable in a rotor which is eccentrically disposed in the rotary sleeve. An air-bearing room is defined between the outer periphery of the rotary sleeve and the inner periphery of the center housing and supplied with air through an inlet internally connected to the discharge chamber or compression working space under the maximum pressure. A multiplicity of air-accumulating grooves are formed in either or both in the outer periphery of the rotary sleeve and the inner periphery of the center housing.The air-accumulating groove is composed of a suction portion gradually inclined from the peripheral direction and a compression portion sharply inclined from or perpendicular to the peripheral direction.

Abstract: A rotary compressor provided with a center housing and side housings, a rotary sleeve mounted for rotation in the housings and a plurality of vanes radially, slidably fitted in a rotor which is eccentrically disposed in the rotary sleeve. The rotary sleeve has its opposite side surfaces formed with a plurality of air-guide grooves. As the rotary sleeve rotates, the air-guide grooves guide air to flow from the compression working space in the rotary sleeve to the air-bearing room between the outer periphery of the rotary sleeve and the inner periphery of the center housing and from the air-bearing room to the suction working space in the rotary sleeve so that an air film is formed in each of the both side clearances between the both side surfaces of the rotary sleeve and the inner surfaces of both side housings.

Abstract: A rotor for a rotary compressor having a metal central portion integral with two opposite end portions that are fiber-reinforced metal matrix composites having a matrix metal common to the central portion. Such rotors may be made by pressing inorganic fibers to form the end portions of the rotor, arranging the end portions in an opposing relationship in a mold to form the central portion between the end portions. Molten metal is placed into the mold such that it infiltrates the porous end portions while forming the central portion. Solidification of the metal forms fiber-reinforced metal-matrix composite end portions integral with the central portion.

Abstract: A rotary compressor with a center housing and a rotary sleeve mounted in the center housing for rotation with a plurality of vanes radially slidably fitted in a rotor which is eccentrically disposed in the rotary sleeve, and an air-bearing room defined between the outer periphery of the rotary sleeve and the inner periphery of the center housing to floatingly support the rotary sleeve, characterized in that a part of compressed air in the rotary compressor is injected into the air-bearing room through the throttles provided in the compression side wall of the center housing to prevent the rotary sleeve from scuffing the inner periphery of the center housing.

Abstract: The rotary compressor according to the present invention is constructed such that a rotary sleeve is rotatably and floatingly, suspended within a central housing by means of a pneumatic bearing chamber. A rotor, into and out of which a vane can freely move, is rotatably housed within said rotary sleeve. On the periphery of said rotary sleeve a taper is formed continuously extending from both ends toward the axial center. Such a construction ensures inhibition of frictional heat generation in the vane and non-lubricated rotation.

Abstract: A method of forming a rotor for a vane-type rotary pump. The rotor is generally cylindrical with a plurality of vane slots. A tubular member having generally flat sections separated one from the other by corner portions is formed into the rotor by forming the flat sections into slots by deforming the tubular member. The slots are thereafter formed into the vane slots with a die and the corner portions are formed into the outer peripheral surface of the rotor, also using a die.

Abstract: A rotary compressor housing is outwardly formed with reinforcing grids in the form of square, diaper or honeycomb. The reinforcing grids allow the intermediate wall portions between the bolted wall portions to thermally expand as much as the bolted wall portions, resulting in that the inner periphery of the center housing always keep its circularity when the inner temperature rises due to an unavoidable compression of air.

Abstract: In a small reciprocating pump, an annular space is provided between a cylinder and a cylinder block. The cylinder is bifurcated at its upper end, and has two projecting edges. One of these projecting edges is radially outwardly spaced apart from the other, and greater in length than the other. A cylinder head has a lower surface provided with an annular groove in which the outer projecting edge of the cylinder is engaged. A seal ring is disposed in this annular groove, and another seal ring between the projecting edges of the cylinder to maintain the cylinder in gastight contact with the cylinder head. The other seal ring also serves to support a metal plate which forms therein a valve. The cylinder head is provided with an intake passage having an intake valve, and a discharge passage having a discharge valve. The cylinder block is connected to a crank case in a gastight fashion. A crankshaft is supported rotatably in the crank case for reciprocating a piston in the cylinder.