EP0220801A1 — Variable volume gas compressor

Claim 1

Independent Claim 148 words

A variable volume gas compressor comprising a compressor body (1) having an intake chamber (11), a cylinder chamber (12), and an angularly movable member (15) having gas passage means (10,16) therein; the gas passage means (10,16) being adapted to control communication between the intake chamber (11) and the cylinder chamber (12), and the effective volume of the gas passage means (10,16) altering as a result of angular movement of the angularly movable member (15) so as to alter the effective volume of a compression space (8 a ); compression means (8,9) in the cylinder chamber (12) for compressing a gas in the compression space (8 a ); and drive means (24-28) for effecting angular movement of the angularly movable member (15) characterised in that the drive means (24-28) effect angular movement of the angularly movable member (15) in dependence upon the intake pressure in the intake chamber (12).

Claim 2

Dependent Claim 148 words

A variable volume gas compressor comprising a compressor body (1) having an intake chamber (11), a cylinder chamber (12), and an angularly movable member (15) having gas passage means (10,16) therein; the gas passage means (10,16) being adapted to control communication between the intake chamber (11) and the cylinder chamber (12), and the effective volume of the gas passage means (10,16) altering as a result of angular movement of the angularly movable member (15) so as to alter the effective volume of a compression space (8 a ); compression means (8,9) in the cylinder chamber (12) for compressing a gas in the compression space (8 a ); and drive means (24-28) for effecting angular movement of the angularly movable member (15) characterised in that the drive means (24-28) effect angular movement of the angularly movable member (15) in dependence upon the intake pressure in the intake chamber (12).

Claim 3

Dependent Claim 43 words

A compressor as claimed in claim 1 characterised in that the angularly movable member (15) is set by the drive means (24-28) in an angular position such that the gas entering the compression space (8 a ) is at a substantially constant pressure.

Claim 4

Dependent Claim 81 words

A compressor as claimed in claim 1 or 2 characterised in that the angularly movable member (15) is connected by connecting means (26,28) to a slidably movable member (24) which has a surface (24 a ) open to the intake pressure in the intake chamber (11), urging means (25) being provided for urging the movable member (24) towards the intake chamber (11), the angular position of the angularly movable member (15) depending upon the position of the slidably movable member (24).

Claim 5

Dependent Claim 31 words

A compressor as claimed in claim 3 characterised in that the slidably movable member (24) comprises a piston (24) which is slidably mounted in a part of the compressor body (1).

Claim 6

Dependent Claim 28 words

A compressor as claimed in claim 4 characterised in that the piston (24) is a hollow piston having a spring (25) therein which constitutes the said urging means.

Claim 7

Dependent Claim 44 words

A compressor as claimed in claim 5 characterised in that the connecting means (26,28) comprise a pin (26) fixed to the angularly movable member (15), the pin (26) being loosely mounted in an engagement recess (28) formed in the side of the piston (24).

Claim 8

Dependent Claim 46 words

A compressor as claimed in any preceding claim characterised in that the compression means (8,9) comprises a rotor (9) which is rotatably mounted in the cylinder chamber (12) and which has radially movable vanes (8) which are engageable with the wall of the cylinder chamber (12).

Claim 9

Dependent Claim 65 words

A compressor as claimed in any preceding claim characterised in that the compressor body (1) has a cylinder block (4) which is disposed between side blocks (5,6), said cylinder block (4), and side blocks (5,6) collectively defining the cylinder chamber (12), the angularly movable member (15) being constituted by a plate (15) which is mounted for angular movement on one of the side blocks (5,6).

Claim 10

Dependent Claim 31 words

A compressor as claimed in claim 5 characterised in that the connecting means comprises a rack (30) and pinion (31) drive between the piston (24') and the angularly movable member (15').

Claim 11

Dependent Claim 44 words

A compressor as claimed in claim 9 in which the rack (30) is formed on one side of the piston (24'), the rack (30) meshing with an intermediate pinion (31) which meshes with a pinion (32) fixed concentrically to the angularly movable member (15').

Claim 12

Dependent Claim 199 words

A gas compressor of variable volume comprising: a cylinder (4) formed into a substantially elliptical or round shape; front andrearside blocks (5,6) fixed to the two sides of the cylinder (4): a rotor (9) fitted rotatably in a cylinder chamber (12), which is defined by said cylinder (4) and said two side blocks (5,6), and carrying a plurality of vanes (8) which can protrude and retract radially thereof; a compression chamber (8 a ) formed by said vanes in said cylinder chamber (12); a rotary plate (15) mounted for rotation within a predetermined angular range on the inner face of said front side block; said rotary plate (15) being rotated to continuously move an intake port (10) communicating with the cylinder chamber (12) of the cylinder (4) relative to a communication port (17) formed in the front side block so that the volume of said compression chamber (8 a ) may be made variable in accordance with the running state of said gas compressor; an intake chamber (11) formed by said front side block; and driving means (24-28) for moving rotatably said rotary plate, the latter being driven in accordance with the intake pressure of said intake chamber (11).

Claim 13

Dependent Claim 199 words

A gas compressor of variable volume comprising: a cylinder (4) formed into a substantially elliptical or round shape; front andrearside blocks (5,6) fixed to the two sides of the cylinder (4): a rotor (9) fitted rotatably in a cylinder chamber (12), which is defined by said cylinder (4) and said two side blocks (5,6), and carrying a plurality of vanes (8) which can protrude and retract radially thereof; a compression chamber (8 a ) formed by said vanes in said cylinder chamber (12); a rotary plate (15) mounted for rotation within a predetermined angular range on the inner face of said front side block; said rotary plate (15) being rotated to continuously move an intake port (10) communicating with the cylinder chamber (12) of the cylinder (4) relative to a communication port (17) formed in the front side block so that the volume of said compression chamber (8 a ) may be made variable in accordance with the running state of said gas compressor; an intake chamber (11) formed by said front side block; and driving means (24-28) for moving rotatably said rotary plate, the latter being driven in accordance with the intake pressure of said intake chamber (11).

Variable volume gas compressor

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