Abstract: In a scroll compressor furnished with a fixed scroll and an orbiting scroll, and provided with steps on end plates of the fixed scroll and the orbiting scroll, formed such that the height thereof is high at a central side and low at an outer peripheral end side in a spiral direction of the walls, and with upper rims of the walls formed in a stepped shape corresponding to the steps, gaps are respectively provided between the end plates and upper rims of the walls, and a height of the gaps at room temperature is formed higher than a height under operating conditions. Moreover, the steps are provided at positions which exceeds a pitch angle of &pgr; (rad) along the spiral direction from the outer peripheral end. Furthermore, a concavity is formed in the end plate of the fixed scroll, and a discharge valve is provided in the concavity. Moreover, a plate which is freely movable in an orbit axis direction of the orbiting scroll is arranged, and a pressing device which presses the plate is provided.

Abstract: In a scroll compressor furnished with a fixed scroll and an orbiting scroll, and provided with steps on end plates of the fixed scroll and the orbiting scroll, formed such that the height thereof is high at a central side and low at an outer peripheral end side in a spiral direction of the walls, and with upper rims of the walls formed in a stepped shape corresponding to the steps, gaps are respectively provided between the end plates and upper rims of the walls, and a height of the gaps at room temperature is formed higher than a height under operating conditions. Moreover, the steps are provided at positions which exceeds a pitch angle of &pgr; (rad) along the spiral direction from the outer peripheral end. Furthermore, a concavity is formed in the end plate of the fixed scroll, and a discharge valve is provided in the concavity. Moreover, a plate which is freely movable in an orbit axis direction of the orbiting scroll is arranged, and a pressing device which presses the plate is provided.

Abstract: Object: To provide a high performance scroll type fluid machine in which machining is facilitated, strength of central end portion of scroll wrap is high enough, volume of the innermost compression chamber becomes zero and yet compression efficiency does not lower.Solving means: A central end portion profile of spiral wrap of each scroll (1, 2) is formed in a step-like shape having at least two steps (1A, 1B and 2A, 2B), the central end portion profile of each said step is made in a complete engagement profile and thickness of said step-like spiral wrap is made thinner at the upper step leaving an end plate.

Abstract: The present invention relates to a scroll type compressor. The compression gas in a discharge chamber is made to flow into a backside small sealed chamber through a leak passage provided before the position on the revolution angle of the revolving scroll, whereat the back side of a volute wrap of the revolving scroll starts to cross a discharge opening and at the same time a pair of small sealed chambers begin to communicate with the discharge chamber.

Abstract: An inexpensive, efficient pump which can supply lubricating oil uses the revolving motion of an orbiting scroll 2. The pump is so constructed that a piston supported by a fixing member 1 is fitted in a cylinder chamber 102 formed in the inner surface of the end plate 21 of an orbiting scroll 2 which revolves while sliding on the fixing member, by which a pump chamber 104 is defined between them. The piston 101 is extended or retracted depending on the revolving motion of orbiting scroll 2, the volume of the pump chamber 104 is increased or decreased, and a fluid suction port 105 and a fluid discharge port 106 are connected to the pump chamber 104 at predetermined time intervals to supply the fluid.