US 5,350,280 AGranted

Fluid compressor

AssigneeKabushiki Kaisha Toshiba

InventorsToshiya Yajima, Takuya Hirayama, Hirotsugu Sakata, Makoto Hayano, Masayuki Okuda, Naoya Morozumi, Takeshi Kumazawa, Teruo Kobuna

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Abstract

A fluid compressor comprises a rotary member, a cylinder, and a closed casing for receiving the rotary member and cylinder. The rotary member and cylinder are relatively turned so that a fluid is drawn into work chambers through a suction port, successively compressed and conveyed toward a discharge port through the work chambers, and discharged outside. The fluid compressor is provided with a control valve means. When pressure in the work chambers exceeds a predetermined value during the compressing process, the control valve releases the pressure through a discharge or suction end of the cylinder, or to the inside of the casing.

Claims7

Dependent claims

A fluid compressor for sucking, compressing, and discharging a fluid, comprising:

(a) a cylinder having a suction port and a discharge port;
(b) a cylindrical rotary member eccentrically disposed in and along said cylinder so that the periphery thereof may partly be in contact with the inner face of said cylinder, said cylinder and rotary member being relatively turntable;
(c) a helical groove formed around said rotary member at pitches that gradually reduce from the suction port side toward the discharge port side;
(d) a helical blade movably fitted in said helical groove, the periphery of said blade being in contact with the inner face of said cylinder, said blade defining a plurality of work chambers between the inner face of said cylinder and the peripheral face of said rotary member;
(e) drive means for relatively turning said rotary member and cylinder so that the fluid is drawn into the work chambers through the suction port, successively compressed and conveyed through the work chambers toward the discharge port, and discharged from the discharge port;
(f) a one-way communication path connecting the bottom of said helical groove to the discharge port of said cylinder;
and
(g) control valve means for releasing pressure from the work chambers if the pressure in the work chambers exceeds a predetermined value during a compressing process;
wherein said one-way communication path is formed in said rotary member;
and
wherein part of said one-way communication path forms a path extending in the same direction as said groove, and said control valve means includes a piston rod disposed in the path, the piston rod being pushed to the bottom of said blade and having an undercut for releasing pressure from the work chambers only when the pressure exceeds the predetermined value.

8 more elements

A fluid compressor comprising:

a closed outer casing having a suction port through which a fluid to be compressed flows into said compressor and a discharging port through which the fluid compressed by said compressor flows out;
a cylinder having an inner cylindrical surface and being rotatably supported around a first rotation axis in said casing with an inner space between said cylinder and said casing, said inner space communicating with the discharging port;
a cylindrical rotary member having an outer cylindrical surface and a diameter smaller than that of the inner cylindrical surface of said cylinder and being rotatably supported in said casing around a second rotation axis A parallel to but displaced from said first axis in order that the outer cylindrical surface of said cylindrical rotary member makes contact with the inner cylindrical surface of said cylinder;
an Oldham coupling provided between said cylinder and said cylindrical rotary member;
a motor supported by said casing in order to rotate said cylinder and said cylindrical rotary member around said first and second rotation axes respectively;
and
a helical blade having a pitch decreasing from one end near the suction port to an other end near the discharging port and being interposed between the inner cylindrical surface of said cylinder and the outer cylindrical surface of said cylindrical rotary member in order to partition a space therebetween into a plurality of work chambers, the work chamber closest to said one end of said helical blade communicating with the suction port, the work chamber closest to the other end of said helical blade communicating with said inner space between said cylinder and said casing,
wherein the outer surface of said cylindrical rotary member is formed with a helical groove with which said helical blade is slidably engaged, and
wherein a one-way communication path is formed to connect said inner space to at least one of said work chambers with a control valve which opens when a differential pressure between said inner space and said at least one of said work chambers exceeds a predetermined value.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/897,690Filed 12 Jun 1992
Priority: JP 3-14008912 Jun 1991
Granted: 27 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

F04C 28/16
Characterised by changing the positions of the inlet or outlet openings with respect to the working chamber: using lift valves
F04C 29/0035
Systems for the equilibration of forces acting on the pump: equalization of pressure pulses
F04C
Rotary-piston, or oscillating-piston, positive-displacement machines for liquids

Family

No related US applications are recorded in the indexed filing history.

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