JP-7856159-B2 - Centrifugal compressor

JP7856159B2JP 7856159 B2JP7856159 B2JP 7856159B2JP-7856159-B2

Inventors

米村淳
金子雄大

Assignees

株式会社IHI

Dates

Publication Date: 20260511
Application Date: 20230405
Priority Date: 20220908

Claims (3)

The intake passage connected to the intake port, A compressor impeller is disposed in the aforementioned intake passage, A movable member is provided in the intake passage on the intake port side of the compressor impeller and is movable between a protruding position that protrudes into the intake passage and a retracted position that retracts from the intake passage. The first end of the inner circumferential surface of the movable member, which is the end on the compressor impeller side, The second end of the movable member, which is the end on the intake port side of the inner circumferential surface, has an arc shape in cross-section along the rotation axis of the compressor impeller, An extended portion provided between the first end and the second end, extending in a direction corresponding to the rotation axis direction of the compressor impeller, Equipped with, The connection position between the second end and the extended portion is located on the compressor impeller side of the center of the movable member in the direction of the rotation axis , The radius of curvature of the second end is greater than the radius of curvature of the first end. The radius of curvature of the second end is greater than the thickness of the movable member in the rotational axis direction. A fillet portion is formed between the second end and the side of the movable member facing the intake port. Centrifugal compressor.
The radial distance between the inner circumferential end of the face of the movable member facing the intake port and the extended portion is 80% or less of the thickness of the movable member in the rotational axis direction. The centrifugal compressor according to claim 1 .
The radial distance between the inner circumferential end of the face of the movable member facing the intake port and the extended portion is 20% or more of the thickness of the movable member in the rotational axis direction. The centrifugal compressor according to claim 1 .

Description

This disclosure relates to a centrifugal compressor. This application claims priority under Japanese Patent Application No. 2022-143038, filed on 8 September 2022, the contents of which are incorporated herein by reference. A centrifugal compressor has a compressor housing in which an intake passage is formed. A compressor impeller is placed in the intake passage. When the flow rate of air flowing into the compressor impeller decreases, the air compressed by the compressor impeller flows back through the intake passage, causing a phenomenon called surging. Patent Document 1 discloses a centrifugal compressor in which a throttling mechanism is provided in the compressor housing. The throttling mechanism is positioned upstream of the intake air relative to the compressor impeller. The throttling mechanism includes a movable member. The movable member is configured to move between a protruding position in which it protrudes into the intake air passage and a retracted position in which it retracts from the intake air passage. The throttling mechanism reduces the cross-sectional area of the intake air passage by causing the movable member to protrude into the intake air passage. When the movable member protrudes into the intake air passage, air flowing backward in the intake air passage is blocked by the movable member. By blocking the air flowing backward in the intake air passage, surging is suppressed. European Patent Application Publication No. 3530954 Figure 1 is a schematic cross-sectional view of a turbocharger according to an embodiment of the present disclosure.Figure 2 is an extracted view of the dashed line portion of Figure 1.Figure 3 is an exploded perspective view of the components that make up the link mechanism.Figure 4 is a cross-sectional view taken along line IV-IV in Figure 2.Figure 5 is the first diagram illustrating the operation of the link mechanism.Figure 6 is a second diagram illustrating the operation of the link mechanism.Figure 7 is a third diagram illustrating the operation of the link mechanism.Figure 8 is a schematic cross-sectional view showing the detailed shape of the movable member.Figure 9 is an extracted view of the dashed line portion of Figure 8.Figure 10 is a schematic cross-sectional view showing the shape of the movable member according to a modified example. Embodiments of this disclosure will be described below with reference to the attached drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely illustrative examples for ease of understanding and do not limit this disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same function or configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to this disclosure are omitted from the illustrations. Figure 1 is a schematic cross-sectional view of the turbocharger TC. The direction of arrow L in Figure 1 is described as the left side of the turbocharger TC. The direction of arrow R in Figure 1 is described as the right side of the turbocharger TC. Of the turbocharger TC, the side facing the compressor housing 100, which will be described later, functions as a centrifugal compressor CC. In the following, the centrifugal compressor CC will be described as being driven by the turbine impeller 8, which will be described later. However, it is not limited to this, and the centrifugal compressor CC may be driven by an engine (not shown) or by an electric motor (not shown). Thus, the centrifugal compressor CC may be incorporated into devices other than the turbocharger TC, or it may be a standalone unit. As shown in Figure 1, the turbocharger TC comprises a turbocharger body 1. The turbocharger body 1 includes a bearing housing 2, a turbine housing 4, a compressor housing 100, and a linkage mechanism 200. Details of the linkage mechanism 200 will be described later. The turbine housing 4 is connected to the left side of the bearing housing 2 by fastening bolts 3. The compressor housing 100 is connected to the right side of the bearing housing 2 by fastening bolts 5. A housing hole 2a is formed in the bearing housing 2. The housing hole 2a penetrates the supercharger TC in the left-right direction. A bearing 6 is disposed in the housing hole 2a. The bearing 6 is, for example, a fully floating bearing. However, the bearing 6 may be other radial bearings such as a semi-floating bearing or a rolling bearing. A part of the shaft 7 is disposed in the housing hole 2a. The shaft 7 is rotatably supported by the bearing 6. A turbine impeller 8 is provided at the left end of the shaft 7. The turbine impeller 8 is rotatably housed within the turbine housing 4. A compressor impeller 9 is provided at the right end of the shaft 7. The compressor impeller 9 is rotatably housed within the compressor housing 100. An intake port 10 is formed in the compressor housing 100. The in