Compressor with directly driven variable iris diaphragm, and charging device

Abstract

A compressor for a supercharging device of an internal combustion engine and a supercharging device are described. The compressor has an iris diaphragm mechanism that has a special drive. The drive includes an adjusting ring as an integral constituent part of an actuator of the drive and is formed as a rotor, which surrounds an air supply channel, of an electric motor. This results in a significantly simplified structural form of the drive.

Claims

1. A compressor for a supercharging device of an internal combustion engine, the compressor comprising: a compressor wheel arranged rotationally conjointly on a rotor shaft; an air supply channel for conducting an air mass flow to the compressor wheel; an iris diaphragm mechanism comprising multiple lamellae, a rotatably mounted adjusting ring, and a multiplicity of permanent magnets disposed on the adjusting ring, the iris diaphragm mechanism arranged upstream of the compressor wheel and, adjustable by the adjusting ring, for closing and opening a diaphragm opening, such that variable setting of a flow cross section for the air mass flow for incident flow on the compressor wheel is possible; an actuator for rotating the adjusting ring; and a compressor housing; wherein the adjusting ring forms an integral constituent part of the actuator and is formed as a torque generating electric motor rotor which surrounds the air supply channel.

2. The compressor as claimed in claim 1, wherein the multiplicity of permanent magnets are arranged around a circumference of the adjusting ring.

3. The compressor as claimed in claim 1, further comprising a multiplicity of coils of the electric motor positioned on the inside of the compressor housing around the circumference thereof.

4. The compressor as claimed in claim 1, wherein the adjusting ring, the iris diaphragm mechanism and the compressor wheel are arranged in series in a flow direction of the air supply channel.

5. The compressor as claimed in claim 1, wherein the adjusting ring drives each lamella of the iris diaphragm mechanism synchronously.

6. The compressor as claimed in claim 1, wherein the adjusting ring directly drives only a main lamella of the iris diaphragm mechanism.

7. A supercharging device for an internal combustion engine, the supercharging device comprising: a compressor including: a compressor wheel arranged rotationally conjointly on a rotor shaft; an air supply channel for conducting an air mass flow to the compressor wheel; an iris diaphragm mechanism comprising multiple lamellae, a rotatably mounted adjusting ring, and a multiplicity of permanent magnets disposed on the adjusting ring, the iris diaphragm mechanism arranged upstream of the compressor wheel and adjustable by the adjusting ring, for closing and opening a diaphragm opening, such that variable setting of a flow cross section for the air mass flow for incident flow on the compressor wheel is possible; an actuator for rotating the adjusting ring; and a compressor housing; wherein the adjusting ring forms an integral constituent part of the actuator and is formed as a torque generating electric motor rotor which surrounds the air supply channel.

8. The supercharging device as claimed in claim 7, wherein the multiplicity of permanent magnets are arranged around a circumference of the adjusting ring.

9. The supercharging device as claimed in claim 7, further comprising a multiplicity of coils of the electric motor positioned on the inside of the compressor housing around the circumference thereof.

10. The supercharging device as claimed in claim 7, wherein the adjusting ring, the iris diaphragm mechanism and the compressor wheel are arranged in series in a flow direction of the air supply channel.

11. The supercharging device as claimed in claim 7, wherein the adjusting ring drives each lamella of the iris diaphragm mechanism synchronously.

12. The supercharging device as claimed in claim 7, wherein the adjusting ring directly drives only a main lamella of the iris diaphragm mechanism.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a diagrammatic illustration, from a front elevation, of the main components of a direct drive for an iris diaphragm mechanism of a compressor.

(2) FIG. 2 is a diagrammatic illustration, from a side elevation, of the direct drive from FIG. 1; and

(3) FIG. 3 is a partially sectional illustration of a compressor.

(4) Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

(5) A compressor, for a supercharging device for an internal combustion engine, is equipped with a compressor wheel 7 arranged rotationally conjointly on a rotor shaft (not shown). Flow is incident on the compressor wheel 7 via an air supply channel 6. Situated upstream of the compressor wheel 7 is an iris diaphragm mechanism 3 (shown only schematically) which has multiple adjustable or pivotable lamellae 8 for closing and opening the diaphragm opening in the iris diaphragm mechanism 3, such that a flow cross section for the air mass flow for incident flow on the compressor wheel 7 is adjustable. In some examples, as shown, the iris diaphragm mechanism 3 has three lamellae 8, which adjust a corresponding diaphragm opening 9.

(6) An adjusting ring 2 serves for the adjustment of the individual lamellae 8. The adjusting ring 2 is rotated, whereby the lamellae 8 are pivoted inward or outward for the adjustment of the diaphragm opening. For this purpose, each lamella is equipped with an actuating element which is guided in a corresponding groove (not shown) of the adjusting ring.

(7) Permanent magnets 5 are arranged, spaced apart from one another, on the circumference of the adjusting ring 2. Coils 4 are situated in a spaced-apart manner on the inside of the circumference of the compressor housing 1 of the compressor. The compressor housing 1 with the coils 4 forms the stator, and the adjusting ring 2 with the magnets 5 forms the rotor, of a torque motor. Through different electrical energization of the coils 4, the adjusting ring 8 is rotated and thus causes inward pivoting or outward pivoting of the lamellae 8 for the adjustment of the diaphragm opening 9.

(8) As can be seen from FIG. 2, the diaphragm mechanism 3 is situated directly upstream of the compressor wheel 7, and the adjusting ring 2 is situated directly upstream of the diaphragm mechanism 3. The adjusting ring 2 surrounds the inflow channel 6 such that, during operation, the air flow is conducted through the adjusting ring 2 via the diaphragm mechanism 3 onto the compressor wheel 7. The air flow thus simultaneously serves to cool the rotor, which acts as adjusting ring 2.

(9) The adjusting ring 2 is therefore integrated into the actuator for the iris diaphragm mechanism 3, and constitutes the rotor of a torque motor. The number of magnets 5 and coils 4 illustrated in the figures is merely an example. Depending on the electrical energization of the coils 4, the adjusting ring 2 is rotated to the left or to the right in FIG. 1 in order to open or close the diaphragm mechanism.

(10) FIG. 3 shows a partially sectional illustration of a compressor equipped with an iris diaphragm mechanism 3. Flow is incident on a compressor wheel 7 via an air supply channel 6. An iris diaphragm mechanism 3 serves for the adjustment of the flow cross section.

(11) The iris diaphragm mechanism 3 has an adjusting ring 2, over the circumference of which permanent magnets 5 are arranged. Coils 4 are provided adjacent to this in the compressor housing 1. Through electrical energization of the coils 4, the adjusting ring 2 is rotated, whereby the iris diaphragm mechanism 3 is opened or closed.

(12) A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the disclosure. Accordingly, other implementations are within the scope of the following claims.