GB2158881A

GB2158881A - Rotary vane compressor

Info

Publication number: GB2158881A
Application number: GB08507204A
Authority: GB
Inventors: Hans Baumgartner; Manfred Brandstadter; Rainer Sudbeck
Original assignee: Pierburg GmbH
Current assignee: Pierburg GmbH
Priority date: 1984-05-18
Filing date: 1985-03-20
Publication date: 1985-11-20
Also published as: IT8547956A0; DE3501782A1; GB8507204D0; IT8547956A1; IT1181634B; FR2564529A1

Abstract

The inlet port 11 of a rotary-vane compressor is associated with an inlet port system comprising a group of several bores 10 in the side-wall or end-wall of cylinder 1, the bores being situated the one after the other in the circumferential direction of the cylinder chamber. The flow cross section of the group of bores is controlled by a slide valve 14. <IMAGE>

Description

SPECIFICATION Rotary vane compressor This invention is applicable to rotary-vane compressors. In particular, the invention relates to a rotary-vane compressor in which gas is driven from an inlet to an outlet by a vaned rotor driven to rotate, the rotor having individual compressor vanes, there being means for continually varying the volumes of the cells defined between the vanes as the rotor rotates.

A device for controlling the inlet port of a rotary-vane compressor is known, for example, from the German Offenlegungsschrift 3144712, in connection with a process for controlling the filling of internal combustion engines with combustible gas. In this known device the volume of combustible gas aspirated is controlled by pivoting inwards into the inlet passage a controlling edge of a rotatable cylinder wall.

From the German Offenlegungsschrift 31 06 028 a rotary-vane motor is known for right-left operation. For achieving the best efficiency in the rightward operation the motor has a group of air-inlet and air-outlet ports, whereas for achieving the best efficiency in the leftward operation the motor has another group of air-inlet and air-outlet ports. The two groups of ports are arranged so that they can be closed in alternation. The ports are situated in a rotatable adjustment sleeve which is also the cylinder in which the vanes slide.

Both these known devices have rotatable cylinder walls,which are costly to make and finish, particularly in regard to preventing major leakages at the housing slits necessary for passing through the actuator connected to the cylinder walls.

The intention in the present invention, starting out from a device of the kind described at the outset, is therefore to control the flow cross section of the inlet port without leakages occurring, and to simplify both the control device and the compressor.

According to the present invention there is provided a rotary-vane compressor with a vaned rotor driven to rotate in a cylindrical chamber, the vanes defining cells whose volumes vary continually, the compressor having an inlet port system which takes the form of a series of bores in the cylinder side-wall or endwall, the bores being situated the one after the other in the circumferential direction of the cylindrical chamber, the bores communicating with an inlet channel for the gasses, each bore having a diameter hardly greater than the thickness of the individual compressor vanes, and wherein the flow cross section of the group of bores is controlled by a slide valve.

Preferably, the slide valve is a rotary slide valve; alternatively, the slide valve may be a flat-plate slide valve.

The invention makes it possible to achieve, particularly in conjunction with the process of the German Offenlegungsschrift 3144712, a more precise control of the aspirated volume of combustible gas. The device is considerably simplified in its construction, compared to the previously known devices, reducing manufacturing costs. And it should have a long working life.

The invention will now be described on the basis of the example shown in the drawing, in which: Figure 1 is a cross section of the device of the present invention applied to a rotary-vane compressor.

Figures 2 and 3 show alternaive constructions.

Fig. 1 shows a rotary-vane compressor with a housing 1, a rotor 2 and rotary vanes 4 fixed to a vane-axle 3. The rotor is eccentric to the cylinder chamber 5 of the compressor, whereas the vane-axle 3 is coaxial with the cylinder chamber 5. The rotor 2 is mounted to rotate on roller bearings (not shown) in the housing 1, and is driven in the conventional manner through a belt or gearwheels.

The vanes 4 subdivide the cylinder chamber 5 into separate cells. As the rotor rotates, the volumes of the cells defined between the vanes 4 change continually. At a region just before a cell reaches its greatest volume,at 6, is an inlet port system 8; and at a region just before a cell reaches its smallest volume, at 7, is an outlet port 9.

The inlet port system 8 consists of a series of bores 10 in the cylinder wall, situated the one after the other in the circumferential direction of the cylinder chamber 5. Gas is admitted to the cylinder chamber, through the bores 10, from a gas-feed channel 11. Each bore 10 has a diameter hardly greater than the thickness of the vane 4.

The outlet port 9 takes the form of an opening 1 2 which leads outwards to the user through an outlet connection channel 1 3.

In Fig. 1, the flow cross-section of the system of bores 10 communicating with the gas-feed channel 11 is controlled by a rotary slide valve 14, whose position of rotation is controlled by a lever 1 5 fixed to an externally projecting stub-axle (not shown) of the rotary slide-valve 14.

In Fig. 2, as an alternative to the rotary slide valve 14, a flat-plate slide valve 16, for controlling the flow cross-section of the system of bores 1 0. The flat-plate slide valve 1 6 is actuated, against the influence of a return spring 17, by a pull-rod 18 which can be pulled from outside the housing 1 to open the inlet port system 8.

In the alternative construction shown in Fig.

3, the inlet port system 8 has bores 10 in the end-wall of the cylinder chamber between where each cell reaches its greatest volume at 6, and where each cell reaches its least volume at 7. As before, the flow cross section of the inlet port system 8 is controlled either by a rotary slide valve 14 or by a flat-plate slider 16.

The invention can also be applied, suitably adapted, to a compressor of the vane-cell type.

Claims

1. A rotary-vane compressor with a vaned rotor driven to rotate in a cylindrical chamber, the vanes defining cells whose volumes varycontinually, the compressor having an inlet port system which takes the form of a series of bores in the cylinder side-wall or end-wall, the bores being situated the one after the other in the circumferential direction of the cylindrical chamber, the bores communicating with an inlet channel for the gasses, each bore having a diameter hardly greater than the thickness of the individual compressor vanes, and wherein the flow cross-section of the group of bores (10) is controlled by a slide valve (14, 16).

2. A compessor as claimed in Claim 1, wherein the slide valve is a rotary slide valve (14).

3. A compressor as claimed in Claim 1, wherein the slide valve is a flat-plate slide valve (1 6).

4. A rotary valve compressor substantially as herein before described with reference to any one of the accompanying drawings.