WO2022054598A1 - Centrifugal compressor and supercharger - Google Patents

Abstract

A centrifugal compressor CC comprising: a housing (compressor housing 100) in which an air intake flow passage connected with an air intake port is formed; a compressor impeller positioned in the air intake flow passage; movable members (first movable member 210, second movable member 220) positioned more on the air intake port side than the compressor impeller in the air intake flow path; an electric actuator connected with the movable members; and magnet parts 311, 312, 313, 321, 322, 323, 331, 332 provided to at least one among the portion of the housing facing the movable members, and the movable members.

Description

Centrifugal compressor and turbocharger

This disclosure relates to centrifugal compressors and turbochargers. This application claims the benefit of priority under Japanese Patent Application No. 2020-151016 filed on September 9, 2020, the contents of which are incorporated herein by reference.

The centrifugal compressor is equipped with a compressor housing in which an intake flow path is formed. A compressor impeller is arranged in the intake flow path. When the flow rate of the air flowing into the compressor impeller decreases, the air compressed by the compressor impeller flows back through the intake flow path, and a phenomenon called surging occurs.

Patent Document 1 discloses a centrifugal compressor in which a throttle mechanism is provided in a compressor housing. The throttle mechanism is arranged on the upstream side of the intake air with respect to the compressor impeller. The diaphragm mechanism includes a movable member. The movable member is configured to be movable between a protruding position protruding into the intake flow path and a retracting position retracting from the intake flow path. The throttle mechanism reduces the cross-sectional area of the intake flow path by projecting the movable member into the intake flow path. When the movable member protrudes into the intake flow path, the air flowing back in the intake flow path is blocked by the movable member. Surging is suppressed by blocking the air flowing back in the intake flow path.

European Patent Application Publication No. 3530954

By the way, as an actuator for driving a movable member of a diaphragm mechanism, an electric actuator is generally used. When the movable member is located at a specific position (for example, a protruding position or a retracted position), the actuator may be continuously energized in order to hold the movable member at the specific position. As a result, excessive heat generation may occur in the actuator, and the temperature of the actuator may become excessively high. If the temperature of the actuator becomes excessively high, the performance of the actuator may deteriorate due to demagnetization or the like.

An object of the present disclosure is to provide a centrifugal compressor and a turbocharger capable of suppressing heat generation in an actuator.

In order to solve the above problems, the centrifugal compressor of the present disclosure includes a housing in which an intake flow path connected to an intake port is formed, a compressor impeller arranged in the intake flow path, and a compressor impeller among the intake flow paths. A movable member arranged closer to the intake port, an electric actuator connected to the movable member, a portion of the housing facing the movable member, and a magnet portion provided on at least one of the movable members. Be prepared.

A plurality of movable members are provided, and the magnet portion is provided on at least one of a portion of the housing that faces the movable member in a state where the plurality of movable members are in contact with each other and a portion of the movable member that abuts on another movable member. It may be provided.

A plurality of movable members are provided, and the magnet portion is the portion of the housing that faces the movable member when the plurality of movable members are separated from each other, and the magnet portion is the most separated from the housing when the plurality of movable members of the movable members are separated from each other. It may be provided on at least one of the adjacent portions.

The direction of the magnetic force generated by the magnet portion may be the direction along the moving direction of the movable member.

The magnet portion may hold the movable member at a specific position when the movable member is located at a specific position.

In order to solve the above problems, the turbocharger of the present disclosure includes the above centrifugal compressor.

According to the present disclosure, heat generation in the actuator can be suppressed.

FIG. 1 is a schematic cross-sectional view of the turbocharger. FIG. 2 is an extracted view of the broken line portion of FIG. FIG. 3 is an exploded perspective view of the members constituting the link mechanism. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a first diagram for explaining the operation of the link mechanism. FIG. 6 is a second diagram for explaining the operation of the link mechanism. FIG. 7 is a third diagram for explaining the operation of the link mechanism. FIG. 8 is a cross-sectional view showing a state in which the first movable member and the second movable member are held in the retracted position.

An embodiment of the present disclosure will be described below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding, and the present disclosure is not limited unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate explanations, and elements not directly related to the present disclosure are omitted from the illustration. do.

FIG. 1 is a schematic cross-sectional view of the turbocharger TC. The arrow L direction shown in FIG. 1 will be described as the left side of the turbocharger TC. The arrow R direction shown in FIG. 1 will be described as the right side of the turbocharger TC. Of the turbocharger TC, the compressor housing 100 side, which will be described later, functions as a centrifugal compressor CC. Hereinafter, the centrifugal compressor CC will be described as being driven by the turbine impeller 8 described later. However, the present invention is not limited to this, and the centrifugal compressor CC may be driven by an engine (not shown) or an electric motor (motor) (not shown). As described above, the centrifugal compressor CC may be incorporated in a device other than the turbocharger TC, or may be a single unit.

As shown in FIG. 1, the supercharger TC includes a supercharger main body 1. The turbocharger main body 1 includes a bearing housing 2, a turbine housing 4, a compressor housing (housing) 100, and a link mechanism 200. The details of the link mechanism 200 will be described later. A turbine housing 4 is connected to the left side of the bearing housing 2 by a fastening bolt 3. A compressor housing 100 is connected to the right side of the bearing housing 2 by a fastening bolt 5.

A housing hole 2a is formed in the bearing housing 2. The accommodating hole 2a penetrates in the left-right direction of the turbocharger TC. A bearing 6 is arranged in the accommodating hole 2a. The bearing 6 is, for example, a full floating bearing. However, the bearing 6 may be another radial bearing such as a semi-floating bearing or a rolling bearing. A part of the shaft 7 is arranged in the accommodating hole 2a. The shaft 7 is rotatably supported by a bearing 6. A turbine impeller 8 is provided at the left end of the shaft 7. The turbine impeller 8 is rotatably housed in 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 in the compressor housing 100.

An intake port 10 is formed in the compressor housing 100. The intake port 10 opens on the right side of the turbocharger TC. The intake port 10 is connected to an air cleaner (not shown). A diffuser flow path 11 is formed between the bearing housing 2 and the compressor housing 100. The diffuser flow path 11 boosts air. The diffuser flow path 11 is formed in an annular shape from the inside to the outside in the radial direction (hereinafter, simply referred to as the radial direction) of the compressor impeller 9. The diffuser flow path 11 communicates with the intake port 10 via the compressor impeller 9 on the inner side in the radial direction.

Further, the compressor scroll flow path 12 is formed in the compressor housing 100. The compressor scroll flow path 12 is formed in an annular shape. The compressor scroll flow path 12 is located, for example, radially outside the compressor impeller 9. The compressor scroll flow path 12 communicates with the intake port of an engine (not shown) and the diffuser flow path 11. When the compressor impeller 9 rotates, air is taken into the compressor housing 100 from the intake port 10. The intake air is pressurized and accelerated in the process of flowing between the blades of the compressor impeller 9. The pressurized and accelerated air is boosted in the diffuser flow path 11 and the compressor scroll flow path 12. The boosted air flows out from a discharge port (not shown) and is guided to the intake port of the engine.

As described above, the turbocharger TC includes a centrifugal compressor (compressor) CC. The centrifugal compressor CC includes a compressor housing 100, a compressor impeller 9, and a link mechanism 200 described later.

An exhaust port 13 is formed in the turbine housing 4. The exhaust port 13 opens on the left side of the turbocharger TC. The exhaust port 13 is connected to an exhaust gas purification device (not shown). A communication flow path 14 and a turbine scroll flow path 15 are formed in the turbine housing 4. The turbine scroll flow path 15 is located radially outside the turbine impeller 8. The communication flow path 14 is located between the turbine impeller 8 and the turbine scroll flow path 15.

The turbine scroll flow path 15 communicates with a gas inlet (not shown). Exhaust gas discharged from an engine exhaust manifold (not shown) is guided to the gas inlet. The communication flow path 14 communicates the turbine scroll flow path 15 with the exhaust port 13. The exhaust gas guided from the gas inlet to the turbine scroll flow path 15 is guided to the exhaust port 13 via the communication flow path 14 and the blades of the turbine impeller 8. The exhaust gas rotates the turbine impeller 8 in its distribution process.

The rotational force of the turbine impeller 8 is transmitted to the compressor impeller 9 via the shaft 7. As described above, the air is boosted by the rotational force of the compressor impeller 9 and guided to the intake port of the engine.

FIG. 2 is an extracted view of the broken line portion of FIG. As shown in FIGS. 1 and 2, the compressor housing 100 includes a first housing member 110 and a second housing member 120. The first housing member 110 is located on the right side (the side separated from the bearing housing 2) in FIG. 2 with respect to the second housing member 120. The second housing member 120 is connected to the bearing housing 2. The first housing member 110 is connected to the second housing member 120.

As shown in FIG. 2, the first housing member 110 has a substantially cylindrical shape. A through hole 111 is formed in the first housing member 110. The first housing member 110 has an end face 112 on the side close to (connecting) to the second housing member 120. Further, the first housing member 110 has an end face 113 on the side separated from the second housing member 120. An intake port 10 is formed on the end surface 113. The through hole 111 extends from the end face 112 to the end face 113 along the rotation axis direction of the compressor impeller 9 (hereinafter, simply referred to as the rotation axis direction). That is, the through hole 111 penetrates the first housing member 110 in the rotation axis direction.

The through hole 111 has a parallel portion 111a and a reduced diameter portion 111b. The parallel portion 111a is located on the end face 113 side of the diameter reduction portion 111b. The inner diameter of the parallel portion 111a is substantially constant over the direction of the axis of rotation. The reduced diameter portion 111b is located on the end face 112 side of the parallel portion 111a. The reduced diameter portion 111b is continuous with the parallel portion 111a. The inner diameter of the portion of the reduced diameter portion 111b that is continuous with the parallel portion 111a is approximately equal to the inner diameter of the parallel portion 111a. The inner diameter of the reduced diameter portion 111b becomes smaller as it is separated from the parallel portion 111a (that is, closer to the end surface 112).

A notch 112a is formed on the end face 112. The cutout portion 112a is recessed from the end surface 112 toward the end surface 113. The cutout portion 112a is formed on the outer peripheral portion of the end face 112. The cutout portion 112a is, for example, generally annular when viewed from the direction of the rotation axis.

Further, a storage chamber AC is formed on the end face 112. The accommodation chamber AC is formed on the intake port 10 side of the first housing member 110 with respect to the leading edge LE of the blades of the compressor impeller 9. The accommodation chamber AC includes an accommodation groove 112b, which will be described later, a bearing hole 112d, and an accommodation hole 115 (see FIG. 3).

The accommodating groove 112b is formed on the end face 112. The accommodating groove 112b is located between the notch 112a and the through hole 111. The accommodating groove 112b is recessed from the end surface 112 toward the end surface 113. The accommodating groove 112b is, for example, generally annular when viewed from the direction of the rotation axis. The accommodating groove 112b communicates with the through hole 111 on the inner side in the radial direction.

A bearing hole 112d is formed in the wall surface 112c on the end face 113 side of the accommodating groove 112b. The bearing hole 112d extends in the rotation axis direction from the wall surface 112c toward the end face 113 side. Two bearing holes 112d are provided so as to be separated from each other in the rotation direction of the compressor impeller 9 (hereinafter, simply referred to as a rotation direction or a circumferential direction). The two bearing holes 112d are arranged at positions offset by 180 degrees in the rotational direction.

A through hole 121 is formed in the second housing member 120. The second housing member 120 has an end face 122 on the side close to (connecting) to the first housing member 110. Further, the second housing member 120 has an end surface 123 on the side separated from the first housing member 110 (the side connected to the bearing housing 2). The through hole 121 extends from the end face 122 to the end face 123 along the rotation axis direction. That is, the through hole 121 penetrates the second housing member 120 in the rotation axis direction.

The inner diameter of the end portion of the through hole 121 on the end surface 122 side is approximately equal to the inner diameter of the end portion of the through hole 111 on the end surface 112 side. A shroud portion 121a is formed on the inner wall of the through hole 121. The shroud portion 121a faces the compressor impeller 9 from the outside in the radial direction. The outer diameter of the compressor impeller 9 becomes larger as it is separated from the leading edge LE of the blades of the compressor impeller 9. The inner diameter of the shroud portion 121a increases as it is separated from the end face 122 (that is, closer to the end face 123).

A housing groove 122a is formed on the end face 122. The accommodating groove 122a is recessed from the end surface 122 toward the end surface 123. The accommodating groove 122a is, for example, generally annular when viewed from the direction of the rotation axis. The first housing member 110 is inserted into the accommodating groove 122a. The end surface 112 of the first housing member 110 comes into contact with the wall surface 122b on the end surface 123 side of the accommodating groove 122a. At this time, a storage chamber AC is formed between the first housing member 110 (specifically, the wall surface 112c) and the second housing member 120 (specifically, the wall surface 122b).

The intake flow path 130 is formed by the through hole 111 of the first housing member 110 and the through hole 121 of the second housing member 120. That is, the intake flow path 130 is formed in the compressor housing 100. The intake flow path 130 is connected to the intake port 10 on one side and is connected to the diffuser flow path 11 on the other side. The intake port 10 and the diffuser flow path 11 communicate with each other via the intake flow path 130. The intake port 10 side of the intake flow path 130 is the upstream side of the intake air, and the diffuser flow path 11 side of the intake flow path 130 is the downstream side of the intake air.

The compressor impeller 9 is arranged in the intake flow path 130. The cross-sectional shape of the intake flow path 130 (that is, the through holes 111, 121) perpendicular to the rotation axis direction is, for example, a circle centered on the rotation axis of the compressor impeller 9. However, the cross-sectional shape of the intake flow path 130 is not limited to this, and may be, for example, an elliptical shape.

A sealing material (not shown) is arranged in the cutout portion 112a of the first housing member 110. The sealing material suppresses the flow rate of air flowing through the gap between the first housing member 110 and the second housing member 120. However, the notch 112a and the sealing material are not essential components.

FIG. 3 is an exploded perspective view of the members constituting the link mechanism 200. In FIG. 3, only the first housing member 110 of the compressor housing 100 is shown. As shown in FIG. 3, the link mechanism 200 includes a first housing member 110, a first movable member 210, a second movable member 220, a connecting member 230, and a rod 240. The link mechanism 200 is arranged on the intake port 10 side (upstream side) of the intake flow path 130 with respect to the compressor impeller 9 in the rotation axis direction.

The first movable member 210 is arranged in the accommodation groove 112b (accommodation chamber AC). Specifically, the first movable member 210 is arranged between the wall surface 112c of the accommodating groove 112b and the wall surface 122b of the accommodating groove 122a (see FIG. 2) in the rotation axis direction. The first movable member 210 is formed of, for example, a resin material. The first movable member 210 is molded, for example, by injection molding.

The first movable member 210 has an facing surface S1 facing the wall surface 112c of the accommodating groove 112b and an opposing surface S2 facing the wall surface 122b of the accommodating groove 122a. The first movable member 210 has a main body portion B1. The main body portion B1 includes a curved portion 211 and an arm portion 212.

The curved portion 211 extends in the circumferential direction of the compressor impeller 9. The curved portion 211 has a substantially semicircular arc shape. Of the curved portions 211, one end surface 211a and the other end surface 211b in the circumferential direction extend in parallel in the radial direction and the rotation axis direction. However, the one end surface 211a and the other end surface 211b may be inclined with respect to the radial direction and the rotation axis direction.

An arm portion 212 is provided on one end surface 211a side of the curved portion 211. The arm portion 212 extends radially outward from the outer peripheral surface 211c of the curved portion 211. Further, the arm portion 212 extends in a direction inclined with respect to the radial direction (second movable member 220 side).

The second movable member 220 is arranged in the accommodation groove 112b (accommodation chamber AC). Specifically, the second movable member 220 is arranged between the wall surface 112c of the accommodating groove 112b and the wall surface 122b of the accommodating groove 122a (see FIG. 2) in the rotation axis direction. The second movable member 220 is formed of, for example, a resin material. The second movable member 220 is molded, for example, by injection molding.

The second movable member 220 has an facing surface S1 facing the wall surface 112c of the accommodating groove 112b and an opposing surface S2 facing the wall surface 122b of the accommodating groove 122a. The second movable member 220 has a main body portion B2. The main body portion B2 includes a curved portion 221 and an arm portion 222.

The curved portion 221 extends in the circumferential direction of the compressor impeller 9. The curved portion 221 has a substantially semicircular arc shape. Of the curved portions 221 the one end surface 221a and the other end surface 221b in the circumferential direction extend in parallel in the radial direction and the rotation axis direction. However, the one end surface 221a and the other end surface 221b may be inclined with respect to the radial direction and the rotation axis direction.

An arm portion 222 is provided on the one end surface 221a side of the curved portion 221. The arm portion 222 extends radially outward from the outer peripheral surface 221c of the curved portion 221. Further, the arm portion 222 extends in a direction inclined with respect to the radial direction (first movable member 210 side).

The curved portion 211 faces the curved portion 221 with the rotation center of the compressor impeller 9 interposed therebetween (that is, sandwiching the intake flow path 130). The one end surface 211a of the curved portion 211 faces the other end surface 221b of the curved portion 221 in the circumferential direction. The other end surface 211b of the curved portion 211 faces the one end surface 221a of the curved portion 221 in the circumferential direction. In the first movable member 210 and the second movable member 220, the curved portions 211 and 221 are movable in the radial direction, as will be described in detail later.

The connecting member 230 is connected to the first movable member 210 and the second movable member 220. The connecting member 230 is located closer to the intake port 10 than the first movable member 210 and the second movable member 220. The connecting member 230 has a generally arcuate shape. A first bearing hole 231 is formed on one end side of the connecting member 230 in the circumferential direction, and a second bearing hole 232 is formed on the other end side of the connecting member 230. The first bearing hole 231 and the second bearing hole 232 open in the end surface 233 on the side of the first movable member 210 and the second movable member 220 of the connecting member 230. The first bearing hole 231 and the second bearing hole 232 extend in the rotation axis direction. Here, the first bearing hole 231 and the second bearing hole 232 are composed of non-penetrating holes. However, the first bearing hole 231 and the second bearing hole 232 may penetrate the connecting member 230 in the rotation axis direction.

A rod connecting portion 234 is formed between the first bearing hole 231 and the second bearing hole 232 of the connecting member 230. The rod connecting portion 234 is formed on the end surface 235 of the connecting member 230 opposite to the first movable member 210 and the second movable member 220. The rod connecting portion 234 protrudes from the end face 235 in the rotation axis direction. The rod connecting portion 234 has, for example, a roughly cylindrical shape.

The rod 240 has a roughly cylindrical shape. A flat surface portion 241 is formed at one end of the rod 240, and a connecting portion 243 is formed at the other end of the rod 240. The flat surface portion 241 extends in the plane direction substantially perpendicular to the rotation axis direction. A bearing hole 242 opens in the flat surface portion 241. The bearing hole 242 extends in the direction of the rotation axis. The connecting portion 243 has a connecting hole 243a. An actuator 250 (see FIGS. 5 to 7) described later is connected to the connecting portion 243 (specifically, the connecting hole 243a). The bearing hole 242 may be a long hole whose length in the direction perpendicular to the rotation axis direction and the axial direction of the rod 240 is longer than the axial length of the rod 240, for example.

A rod large diameter portion 244 and two rod small diameter portions 245 are formed between the flat surface portion 241 and the connecting portion 243 of the rod 240. The rod large diameter portion 244 is arranged between the two rod small diameter portions 245. Of the two rod small diameter portions 245, the rod small diameter portion 245 on the flat surface portion 241 side connects the rod large diameter portion 244 and the flat surface portion 241. Of the two rod small diameter portions 245, the rod small diameter portion 245 on the connecting portion 243 side connects the rod large diameter portion 244 and the connecting portion 243. The outer diameter of the rod large diameter portion 244 is larger than the outer diameter of the two rod small diameter portions 245.

An insertion hole 114 is formed in the first housing member 110. One end 114a of the insertion hole 114 opens to the outside of the first housing member 110. The insertion hole 114 extends, for example, in a plane direction perpendicular to the rotation axis direction. The insertion hole 114 is located radially outside the through hole 111 (that is, radially outside the intake flow path 130). The flat surface portion 241 side of the rod 240 is inserted into the insertion hole 114. The rod large diameter portion 244 is guided by the inner wall surface of the insertion hole 114. The movement of the rod 240 in a direction other than the central axis direction of the insertion hole 114 (that is, the central axis direction of the rod 240) is restricted.

A housing hole 115 is formed in the first housing member 110. The accommodating hole 115 opens in the wall surface 112c of the accommodating groove 112b. The accommodating hole 115 is recessed from the wall surface 112c toward the intake port 10. The accommodating hole 115 is located on the side (second housing member 120 side) separated from the intake port 10 from the insertion hole 114. The accommodating hole 115 has a substantially arc shape when viewed from the direction of the rotation axis. The accommodating hole 115 extends longer in the circumferential direction than the connecting member 230. The accommodating hole 115 is separated from the bearing hole 112d in the circumferential direction.

A communication hole 116 is formed in the first housing member 110. The communication hole 116 communicates the insertion hole 114 and the accommodating hole 115. The communication hole 116 is formed in an approximately intermediate portion in the circumferential direction of the accommodating hole 115. The communication hole 116 is, for example, an elongated hole extending substantially parallel to the extension direction of the insertion hole 114. The width of the communication hole 116 in the longitudinal direction (extending direction) is larger than the width of the communication hole 116 in the lateral direction (direction perpendicular to the extending direction). The width of the communication hole 116 in the lateral direction is larger than the outer diameter of the rod connecting portion 234 of the connecting member 230.

The connecting member 230 is accommodated in the accommodation hole 115 (accommodation chamber AC). In this way, the first movable member 210, the second movable member 220, and the connecting member 230 are arranged in the accommodation chamber AC formed in the first housing member 110. The circumferential length of the accommodating hole 115 is longer than the circumferential length of the connecting member 230. The radial width of the accommodating hole 115 is also larger than the radial width of the connecting member 230. Therefore, the movement of the connecting member 230 in the plane direction perpendicular to the rotation axis direction is allowed inside the accommodating hole 115.

The rod connection portion 234 is inserted from the communication hole 116 into the insertion hole 114. The flat surface portion 241 of the rod 240 is inserted into the insertion hole 114. The bearing hole 242 of the flat surface portion 241 faces the communication hole 116. The rod connecting portion 234 is inserted into and connected to the bearing hole 242. The rod connection portion 234 is pivotally supported in the bearing hole 242.

FIG. 4 is a sectional view taken along line IV-IV of FIG. As shown by the broken line in FIG. 4, the first movable member 210 has a connecting shaft portion 213 and a rotating shaft portion 214. The connecting shaft portion 213 and the rotating shaft portion 214 project from the facing surface S1 (see FIG. 2) facing the wall surface 112c of the first movable member 210 in the rotation axis direction. The connecting shaft portion 213 and the rotating shaft portion 214 extend to the back side of the paper surface in FIG. The rotation shaft portion 214 extends in parallel with the connecting shaft portion 213. The connecting shaft portion 213 and the rotating shaft portion 214 have a substantially cylindrical shape.

The outer diameter of the connecting shaft portion 213 is smaller than the inner diameter of the first bearing hole 231 of the connecting member 230. The connecting shaft portion 213 is inserted into the first bearing hole 231. The connecting shaft portion 213 is rotatably supported in the first bearing hole 231. The outer diameter of the rotating shaft portion 214 is smaller than the inner diameter of the bearing hole 112d of the first housing member 110. The rotating shaft portion 214 is inserted into the bearing hole 112d on the vertically upper side (that is, the side close to the rod 240) of the two bearing holes 112d. The rotary shaft portion 214 is rotatably supported by the bearing hole 112d.

The second movable member 220 has a connecting shaft portion 223 and a rotating shaft portion 224. The connecting shaft portion 223 and the rotating shaft portion 224 project in the rotation axis direction from the facing surface S1 (see FIG. 2) facing the wall surface 112c of the second movable member 220. The connecting shaft portion 223 and the rotating shaft portion 224 extend to the back side of the paper surface in FIG. The rotation shaft portion 224 extends parallel to the connecting shaft portion 223. The connecting shaft portion 223 and the rotating shaft portion 224 have a substantially cylindrical shape.

The outer diameter of the connecting shaft portion 223 is smaller than the inner diameter of the second bearing hole 232 of the connecting member 230. The connecting shaft portion 223 is inserted into the second bearing hole 232. The connecting shaft portion 223 is rotatably supported by the second bearing hole 232. The outer diameter of the rotating shaft portion 224 is smaller than the inner diameter of the bearing hole 112d of the first housing member 110. The rotating shaft portion 224 is inserted into the bearing hole 112d on the vertically lower side (that is, the side separated from the rod 240) of the two bearing holes 112d. The rotary shaft portion 224 is rotatably supported by the bearing hole 112d.

As described above, the link mechanism 200 is a four-section link mechanism. The four links (sections) are a first movable member 210, a second movable member 220, a first housing member 110, and a connecting member 230. Since the link mechanism 200 is a four-section link mechanism, it is a limited chain and has one degree of freedom and is easy to control.

Note that FIG. 4 shows the magnet portions 311, 312, 313, 321, 322, 323, 331, and 332, and the description of these magnet portions will be described later.

FIG. 5 is a first diagram for explaining the operation of the link mechanism 200. In FIGS. 5, 6 and 7 below, a view of the link mechanism 200 as viewed from the intake port 10 side is shown. As shown in FIG. 5, the end portion of the drive shaft 251 of the actuator 250 is connected to the connecting portion 243 of the rod 240.

The actuator 250 is an electric actuator and is driven by electricity. The actuator 250 is, for example, an electric cylinder having a motor (not shown). In this case, the rotational power of the motor is converted into power in the straight direction and transmitted to the drive shaft 251. As a result, the drive shaft 251 moves in the axial direction. When the rotation direction of the motor is switched, the moving direction of the drive shaft 251 is switched.

In the arrangement shown in FIG. 5, the first movable member 210 and the second movable member 220 are in contact with each other. At this time, as shown in FIGS. 2 and 4, the protruding portion 215, which is an inner portion in the radial direction of the first movable member 210, protrudes (exposed) into the intake flow path 130. Of the second movable member 220, the protruding portion 225, which is an inner portion in the radial direction, protrudes (exposed) into the intake flow path 130. The positions of the first movable member 210 and the second movable member 220 in this state (specifically, the state shown in FIG. 5) are referred to as protrusion positions (or aperture positions).

As shown in FIG. 5, at the protruding position, the peripheral end portions 215a and 215b of the protruding portion 215 and the circumferential end portions 225a and 225b of the protruding portion 225 are in contact with each other. An annular hole 260 is formed by the protrusion 215 and the protrusion 225. The inner diameter of the annular hole 260 is smaller than the inner diameter of the intake flow path 130 at the position where the protrusions 215 and 225 protrude. The inner diameter of the annular hole 260 is, for example, smaller than the inner diameter of any position of the intake flow path 130.

FIG. 6 is a second diagram for explaining the operation of the link mechanism 200. FIG. 7 is a third diagram for explaining the operation of the link mechanism 200. The actuator 250 linearly moves the rod 240 in a direction intersecting the rotation axis direction (vertical direction in FIGS. 6 and 7). In FIGS. 6 and 7, the rod 240 moves upward from the position shown in FIG. The amount of movement of the rod 240 with respect to the arrangement of FIG. 5 is larger in the arrangement of FIG. 7 than in the arrangement of FIG.

When the rod 240 moves, the connecting member 230 moves upward in FIGS. 6 and 7 via the rod connecting portion 234. At this time, the connecting member 230 is allowed to rotate about the rod connecting portion 234 as the rotation center. Further, there is a slight play in the inner diameter of the bearing hole 242 of the rod 240 with respect to the outer diameter of the rod connecting portion 234. Therefore, the movement of the connecting member 230 in the plane direction perpendicular to the rotation axis direction is slightly allowed.

As described above, the link mechanism 200 is a four-section link mechanism. The connecting member 230, the first movable member 210, and the second movable member 220 exhibit one degree of freedom with respect to the first housing member 110. Specifically, the connecting member 230 slightly swings in the left-right direction while slightly rotating counterclockwise in FIGS. 6 and 7 within the above allowable range.

Of the first movable member 210, the rotating shaft portion 214 is pivotally supported by the first housing member 110. The rotation shaft portion 214 is restricted from moving in the plane direction perpendicular to the rotation axis direction. The connecting shaft portion 213 is pivotally supported by the connecting member 230. Since the connecting member 230 is allowed to move, the connecting shaft portion 213 is provided so as to be movable in the plane direction perpendicular to the rotation axis direction. As a result, as the connecting member 230 moves, the first movable member 210 rotates clockwise in FIGS. 6 and 7 with the rotation shaft portion 214 as the center of rotation.

Similarly, of the second movable member 220, the rotary shaft portion 224 is pivotally supported by the first housing member 110. The rotation shaft portion 224 is restricted from moving in the plane direction perpendicular to the rotation axis direction. The connecting shaft portion 223 is pivotally supported by the connecting member 230. Since the connecting member 230 is allowed to move, the connecting shaft portion 223 is provided so as to be movable in the plane direction perpendicular to the rotation axis direction. As a result, as the connecting member 230 moves, the second movable member 220 rotates in the clockwise direction in FIGS. 6 and 7 with the rotation shaft portion 224 as the center of rotation.

Thus, the first movable member 210 and the second movable member 220 move in the direction of separating from each other in the order of FIGS. 6 and 7. The protrusions 215 and 225 move radially outward of the protrusion position. The positions of the first movable member 210 and the second movable member 220 in this state (specifically, the state shown in FIG. 7) are referred to as evacuation positions. In the retracted position, for example, the protrusions 215 and 225 are flush with the inner wall surface of the intake flow path 130 or are located radially outside the inner wall surface of the intake flow path 130. When moving from the retracted position to the protruding position, the first movable member 210 and the second movable member 220 approach each other and come into contact with each other in the order of FIGS. 7, 6, and 5. In this way, the positions of the first movable member 210 and the second movable member 220 are switched between the protruding position and the retracted position according to the rotation angle with the rotation shaft portion 214 and 224 as the rotation center.

In this way, the first movable member 210 and the second movable member 220 can move to a protruding position protruding into the intake flow path 130 and a retracted position not exposed (protruding) into the intake flow path 130. In the present embodiment, the first movable member 210 and the second movable member 220 move in the radial direction of the compressor impeller 9. However, the present invention is not limited to this, and the first movable member 210 and the second movable member 220 may rotate around the rotation axis (circumferential direction) of the compressor impeller 9. For example, the first movable member 210 and the second movable member 220 may be shutter blades having two or more blades.

When the first movable member 210 and the second movable member 220 are located in the retracted position (hereinafter, also referred to as the retracted position state), the first movable member 210 and the second movable member 220 do not protrude into the intake flow path 130, so that the intake air (air) flowing through the intake flow path 130 The pressure loss can be reduced.

Further, as shown in FIG. 2, in the first movable member 210 and the second movable member 220, the protruding portions 215 and 225 are arranged in the intake flow path 130 at the protruding positions. When the first movable member 210 and the second movable member 220 are located at the protruding positions, the flow path cross-sectional area of the intake flow path 130 becomes small.

Here, as the flow rate of the air flowing into the compressor impeller 9 decreases, the air compressed by the compressor impeller 9 may flow back in the intake flow path 130 (that is, the air flows from the downstream side to the upstream side). be.

As shown in FIG. 2, when the first movable member 210 and the second movable member 220 are located at the protruding positions (hereinafter, also referred to as protruding position states), the protruding portions 215 and 225 are the leading edge end LE of the compressor impeller 9. It is located on the inner side in the radial direction from the outermost diameter end of. As a result, the air flowing back in the intake flow path 130 is blocked by the protrusions 215 and 225. Therefore, the first movable member 210 and the second movable member 220 can suppress the backflow of air in the intake flow path 130.

Further, since the flow path cross-sectional area of the intake flow path 130 becomes smaller, the flow velocity of the air flowing into the compressor impeller 9 increases. As a result, the occurrence of surging of the centrifugal compressor CC can be suppressed. That is, the centrifugal compressor CC of the present embodiment can expand the operating region of the centrifugal compressor CC to the small flow rate side by forming the protruding position state.

As described above, the first movable member 210 and the second movable member 220 are configured as a throttle member for narrowing the intake flow path 130. That is, in the present embodiment, the link mechanism 200 functions as a throttle mechanism for narrowing the intake flow path 130. The first movable member 210 and the second movable member 220 can change the flow path cross-sectional area of the intake flow path 130 by driving the link mechanism 200.

By the way, in order to hold the first movable member 210 and the second movable member 220 at a specific position when the first movable member 210 and the second movable member 220 are located at a specific position (for example, a protruding position or a retracted position), The actuator 250 may be continuously energized.

In the protruding position state where the first movable member 210 and the second movable member 220 are located at the protruding positions shown in FIG. 5, the actuator 250 is continuously energized so that the rod 240 is pushed downward in FIG. It can be done. For example, the rod 240 continues to be pushed downward in FIG. Alternatively, for example, the operation of pushing the rod 240 downward in FIG. 5 and the operation of slightly moving the rod 240 upward in FIG. 5 are repeated.

In the retracted position state where the first movable member 210 and the second movable member 220 are located at the retracted positions shown in FIG. 7, the actuator 250 is continuously energized so that the rod 240 is pulled upward in FIG. 7. Can be evacuated. For example, the rod 240 continues to be pulled upward in FIG. 7. Alternatively, for example, the operation of pulling the rod 240 upward in FIG. 7 and the operation of slightly moving the rod 240 downward in FIG. 7 are repeated.

As described above, when the first movable member 210 and the second movable member 220 are located at specific positions, the actuator 250 is continuously energized so that the first movable member 210 and the second movable member 220 are moved. It is held in a specific position. As a result, the vibration of the first movable member 210 and the second movable member 220 is suppressed. Therefore, the wear of the first movable member 210 and the second movable member 220 due to the collision with the surrounding members is suppressed. Further, it is possible to prevent the first movable member 210 and the second movable member 220 from being displaced from the desired positions.

However, continuous energization of the actuator 250 may cause excessive heat generation in the actuator 250. As a result, the temperature of the actuator 250 becomes excessively high, and the performance of the actuator 250 may deteriorate due to demagnetization of the motor in the actuator 250 or the like. In particular, since the air circulating in the centrifugal compressor CC has a high temperature, the temperature of the actuator 250 tends to rise.

Therefore, in the centrifugal compressor CC of the present embodiment, as shown in FIGS. 4 and 8, the magnet portions 311, 312, 313, 321 and 322 for holding the first movable member 210 and the second movable member 220 at specific positions are present. 323, 331, 332 are provided. Among the above-mentioned magnet portions, the magnet portions 311, 312, 321 and 322 are magnet portions for the protruding positions that hold the first movable member 210 and the second movable member 220 at the protruding positions. On the other hand, among the above-mentioned magnet portions, the magnet portions 313, 323, 331, and 332 are magnet portions for the retracted position that hold the first movable member 210 and the second movable member 220 in the retracted position. FIG. 4 shows a state in which the first movable member 210 and the second movable member 220 are held at the protruding positions. FIG. 8 is a cross-sectional view showing a state in which the first movable member 210 and the second movable member 220 are held in the retracted position.

Each of the above magnet portions is, for example, a portion of the compressor housing 100 or a movable member (specifically, the first movable member 210 or the second movable member 220) where a permanent magnet is provided. However, a part or all of each of the above magnet parts may be a magnetized part of the compressor housing 100 or the movable member. When a part of the member is magnetized to form a magnet portion, the member needs to be formed of a magnetic material.

4 and 8 show an example in which a part of each of the above magnet portions is exposed on the outer surface of the compressor housing 100 or a movable member (specifically, the first movable member 210 or the second movable member 220). Has been done. However, a part or all of each of the above magnet portions may be provided inside the compressor housing 100 or the movable member without being exposed on the outer surface of the compressor housing 100 or the movable member.

As shown in FIG. 4, the magnet portion 311 is provided on one end surface 211a of the curved portion 211 of the first movable member 210. The magnet portion 322 is provided on the other end surface 221b of the curved portion 221 of the second movable member 220. The one end surface 211a of the curved portion 211 is a portion of the first movable member 210 that comes into contact with the second movable member 220. The other end surface 221b of the curved portion 221 is a portion of the second movable member 220 that comes into contact with the first movable member 210. The magnet portion 311 and the magnet portion 322 are in contact with each other in a protruding position state (that is, a state in which the first movable member 210 and the second movable member 220 are in contact with each other).

The magnet portion 311 extends parallel to, for example, one end surface 211a. However, the magnet portion 311 may be inclined with respect to one end surface 211a. The magnet portion 322 extends parallel to, for example, the other end surface 221b. However, the magnet portion 322 may be inclined with respect to the other end surface 221b. The magnet portion 311 extends from, for example, the radially inner end of the one end surface 211a to the radially outer end. The magnet portion 322 extends from, for example, the radially inner end of the other end surface 221b to the radially outer end. The magnet portion 311 extends from one end portion to the other end portion of the one end surface 211a in the rotation axis direction, for example. The magnet portion 322 extends from one end portion in the rotation axis direction of the other end surface 221b to the other end portion, for example.

Here, the polarity on the magnet portion 322 side of the magnet portion 311 and the polarity on the magnet portion 311 side of the magnet portion 322 are different from each other. Therefore, in the protruding position state, the one end surface 211a and the other end surface 221b are attracted to each other by the magnetic force generated by the magnet portion 311 and the magnet portion 322. The magnetic force generated by the magnet portion 311 and the magnet portion 322 acts in the direction in which the one end surface 211a and the other end surface 221b face each other. The first movable member 210 and the second movable member 220 are movable in a direction in which one end surface 211a and the other end surface 221b face each other. Therefore, the direction of the magnetic force generated by the magnet portion 311 and the magnet portion 322 is a direction along the moving direction of each movable member. The direction along the moving direction of the movable member does not have to exactly match the moving direction, and may include a direction inclined by a predetermined angle with respect to the moving direction.

As shown in FIG. 4, the magnet portion 312 is provided on the other end surface 211b of the curved portion 211 of the first movable member 210. The magnet portion 321 is provided on one end surface 221a of the curved portion 221 of the second movable member 220. The other end surface 211b of the curved portion 211 is a portion of the first movable member 210 that comes into contact with the second movable member 220. The one end surface 221a of the curved portion 221 is a portion of the second movable member 220 that comes into contact with the first movable member 210. The magnet portion 312 and the magnet portion 321 are in contact with each other in the protruding position state.

The magnet portion 312 extends parallel to, for example, the other end surface 211b. However, the magnet portion 312 may be inclined with respect to the other end surface 211b. The magnet portion 321 extends parallel to, for example, one end surface 221a. However, the magnet portion 321 may be inclined with respect to one end surface 221a. The magnet portion 312 extends, for example, from the radially inner end of the other end surface 211b to the radially outer end. The magnet portion 321 extends, for example, from the radially inner end of the one end surface 221a to the radially outer end. The magnet portion 312 extends from one end to the other end of the other end surface 211b in the rotation axis direction, for example. The magnet portion 321 extends from one end portion to the other end portion of the one end surface 221a in the rotation axis direction, for example.

Here, the polarity of the magnet portion 321 side of the magnet portion 312 and the polarity of the magnet portion 312 side of the magnet portion 321 are different from each other. Therefore, in the protruding position state, the other end surface 211b and the one end surface 221a are attracted to each other by the magnetic force generated by the magnet portion 312 and the magnet portion 321. The magnetic force generated by the magnet portion 312 and the magnet portion 321 acts in the direction in which the other end surface 211b and the one end surface 221a face each other. Each movable member of the first movable member 210 and the second movable member 220 can move in the direction in which the other end surface 211b and the one end surface 221a face each other. Therefore, the direction of the magnetic force generated by the magnet portion 312 and the magnet portion 321 is a direction along the moving direction of each movable member.

As described above, the magnet portions 311 and 312, 321 and 322 are provided at the portions of the movable members that come into contact with other movable members. As a result, a magnetic force is generated that attracts the first movable member 210 and the second movable member 220 to each other in the protruding position state. Therefore, when the first movable member 210 and the second movable member 220 are located in the protruding positions, the first movable member 210 and the second movable member 220 can be held in the protruding positions. Therefore, when the first movable member 210 and the second movable member 220 are located at the protruding positions, the energization of the actuator 250 can be stopped. Therefore, heat generation in the actuator 250 is suppressed.

In the above, an example in which the magnet portions 311 and 312, 321 and 322 are provided as the magnet portions for holding the first movable member 210 and the second movable member 220 in the protruding positions has been described. However, a part of the magnet portions 311, 312, 321 and 322 may be omitted from the configuration of the centrifugal compressor CC.

For example, when the first movable member 210 is formed of a magnetic material, the magnet portions 311 and 312 may be omitted from the configuration of the centrifugal compressor CC. Also in this case, the magnet portions 321 and 322 generate a magnetic force that attracts the first movable member 210 and the second movable member 220 to each other. For example, when the second movable member 220 is formed of a magnetic material, the magnet portions 321 and 322 may be omitted from the configuration of the centrifugal compressor CC. Also in this case, the magnet portions 311 and 312 generate a magnetic force that attracts the first movable member 210 and the second movable member 220 to each other.

For example, among the magnet portions 311, 312, 321 and 322, the magnet portions 311 and 322 may be omitted from the configuration of the centrifugal compressor CC. In this case, the magnet portions 312 and 321 generate a magnetic force that attracts the other end surface 211b and the one end surface 221a to each other. For example, among the magnet portions 311, 312, 321 and 322, the magnet portions 312 and 321 may be omitted from the configuration of the centrifugal compressor CC. In this case, the magnet portions 311 and 322 generate a magnetic force that attracts the one end surface 211a and the other end surface 221b to each other. However, as in the example of FIG. 4, the first movable member 210 and the second movable member 220 are provided both between the one end surface 211a and the other end surface 221b and between the other end surface 211b and the one end surface 221a. It is preferable that a magnetic force that attracts each other is generated. Thereby, the magnetic force for holding the first movable member 210 and the second movable member 220 at the protruding positions can be increased.

In the above, each movable member is held in a protruding position by the magnet portions 311 and 312, 321 and 322. However, each movable member is formed by a magnet portion provided in a portion of the compressor housing 100 that faces the movable member (specifically, the first movable member 210 or the second movable member 220) in the protruding position state in the direction of the rotation axis. It may be held in a protruding position.

For example, a magnet portion may be provided on a portion of the wall surface 112c of the accommodating groove 112b that faces the movable member in the direction of the rotation axis in the protruding position state. In this case, it is necessary for the magnetic material to form a movable member facing the magnet portion of the wall surface 112c in the protruding position state. Alternatively, the magnet portion of the movable member needs to be provided at a position facing the magnet portion of the wall surface 112c in the protruding position state. As a result, a magnetic force that holds the movable member in the protruding position can be generated.

For example, a magnet portion may be provided on a portion of the wall surface 122b (see FIG. 2) of the accommodating groove 122a that faces the movable member in the direction of the rotation axis in the protruding position state. In this case, it is necessary for the magnetic material to form a movable member facing the magnet portion of the wall surface 122b in the protruding position state. Alternatively, it is necessary to provide the magnet portion of the movable member at a position facing the magnet portion of the wall surface 122b in the protruding position state. As a result, a magnetic force that holds the movable member in the protruding position can be generated.

When the magnet portion is provided in the portion of the compressor housing 100 that faces the movable member in the direction of the rotation axis in the protruding position state, the direction of the magnetic force generated by the magnet portion is orthogonal to the moving direction of the movable member. However, as in the example of FIG. 4, the direction of the magnetic force generated by the magnet portion is preferably the direction along the moving direction of the movable member. Thereby, the first movable member 210 and the second movable member 220 can be easily held in the protruding position by the magnetic force.

As described above, the portion of the compressor housing 100 facing the movable member (specifically, the first movable member 210 or the second movable member 220) in the protruding position state, and the other movable member of the movable member. The first movable member 210 and the second movable member 220 are brought to the protruding positions by the magnet portion provided on at least one of the abutting portions (specifically, one end surface 211a, the other end surface 211b, one end surface 221a or the other end surface 221b). Can be retained.

As shown in FIG. 8, the magnet portion 313 is provided at the center of the outer peripheral surface 211c of the first movable member 210. The magnet portion 331 is provided at a portion of the compressor housing 100 (specifically, the first housing member 110) that comes into contact with the central portion of the outer peripheral surface 211c. The central portion of the outer peripheral surface 211c is a portion closest to the compressor housing 100 (specifically, a portion that abuts) in the retracted position state (that is, a state in which the first movable member 210 and the second movable member 220 are separated from each other). Is. The portion of the compressor housing 100 where the magnet portion 331 is provided is a portion of the compressor housing 100 that faces the first movable member 210 in the radial direction (specifically, a portion that abuts) in the retracted position state. The magnet portion 313 and the magnet portion 331 are in contact with each other in the retracted position state.

The magnet portion 313 extends in the extending direction of the outer peripheral surface 211c, for example. However, the extending direction of the magnet portion 313 does not have to be along the extending direction of the outer peripheral surface 211c. The magnet portion 331 extends, for example, in the circumferential direction. However, the extending direction of the magnet portion 331 does not have to be along the circumferential direction. The magnet portion 313 extends from one end to the other end of the outer peripheral surface 211c in the rotation axis direction, for example. The magnet portion 331 extends from, for example, a position of the first housing member 110 facing one end of the outer peripheral surface 211c in the rotation axis direction to a position facing the other end of the outer peripheral surface 211c in the rotation axis direction. do.

Here, the polarity of the magnet portion 331 side of the magnet portion 313 and the polarity of the magnet portion 313 side of the magnet portion 331 are different from each other. Therefore, in the retracted position state, the outer peripheral surface 211c and the compressor housing 100 are attracted to each other by the magnetic force generated by the magnet portion 313 and the magnet portion 331. The magnetic force generated by the magnet portion 313 and the magnet portion 331 acts in the direction in which the outer peripheral surface 211c and the compressor housing 100 face each other. The first movable member 210 is movable in the direction in which the outer peripheral surface 211c and the compressor housing 100 face each other. Therefore, the direction of the magnetic force generated by the magnet portion 313 and the magnet portion 331 is the direction along the moving direction of the first movable member 210.

As shown in FIG. 8, the magnet portion 323 is provided at the center of the outer peripheral surface 221c of the second movable member 220. The magnet portion 332 is provided at a portion of the compressor housing 100 (specifically, the first housing member 110) that comes into contact with the central portion of the outer peripheral surface 221c. The central portion of the outer peripheral surface 221c is a portion (specifically, a portion that abuts) closest to the compressor housing 100 in the retracted position state. The portion of the compressor housing 100 where the magnet portion 332 is provided is a portion of the compressor housing 100 that faces the second movable member 220 in the radial direction (specifically, a portion that abuts) in the retracted position state. The magnet portion 323 and the magnet portion 332 are in contact with each other in the retracted position state.

The magnet portion 323 extends in the extending direction of the outer peripheral surface 221c, for example. However, the extending direction of the magnet portion 323 does not have to be along the extending direction of the outer peripheral surface 221c. The magnet portion 332 extends, for example, in the circumferential direction. However, the extending direction of the magnet portion 332 does not have to be along the circumferential direction. The magnet portion 323 extends from one end to the other end of the outer peripheral surface 221c in the rotation axis direction, for example. The magnet portion 332 extends from, for example, a position of the first housing member 110 facing one end of the outer peripheral surface 221c in the rotation axis direction to a position facing the other end of the outer peripheral surface 221c in the rotation axis direction. do.

Here, the polarity of the magnet portion 332 side of the magnet portion 323 and the polarity of the magnet portion 323 side of the magnet portion 332 are different from each other. Therefore, in the retracted position state, the outer peripheral surface 221c and the compressor housing 100 are attracted to each other by the magnetic force generated by the magnet portion 323 and the magnet portion 332. The magnetic force generated by the magnet portion 323 and the magnet portion 332 acts in the direction in which the outer peripheral surface 221c and the compressor housing 100 face each other. The second movable member 220 can move in the direction in which the outer peripheral surface 221c and the compressor housing 100 face each other. Therefore, the direction of the magnetic force generated by the magnet portion 323 and the magnet portion 332 is a direction along the moving direction of the second movable member 220.

As described above, the magnet portions 313 and 323 are provided in the portion of the movable member closest to the compressor housing 100 (specifically, the portion in contact with the compressor housing 100) in the retracted position state. The magnet portions 331 and 332 are provided in a portion (specifically, a portion in contact with the movable member) of the compressor housing 100 that faces the movable member in the radial direction in the retracted position state. As a result, a magnetic force is generated that attracts each movable member and the compressor housing 100 to each other in the retracted position state. Therefore, when the first movable member 210 and the second movable member 220 are located in the retracted position, the first movable member 210 and the second movable member 220 can be held in the retracted position. Therefore, when the first movable member 210 and the second movable member 220 are located at the retracted positions, the energization of the actuator 250 can be stopped. Therefore, heat generation in the actuator 250 is suppressed.

In the above, an example in which magnet portions 313, 323, 331, and 332 are provided as magnet portions for holding the first movable member 210 and the second movable member 220 in the retracted position has been described. However, a part of the magnet portions 313, 323, 331, and 332 may be omitted from the configuration of the centrifugal compressor CC.

For example, when the first movable member 210 is formed of a magnetic material, the magnet portion 313 may be omitted from the configuration of the centrifugal compressor CC. Even in this case, the magnet portion 331 also generates a magnetic force that attracts the first movable member 210 and the compressor housing 100 to each other. For example, when the second movable member 220 is formed of a magnetic material, the magnet portion 323 may be omitted from the configuration of the centrifugal compressor CC. Even in this case, the magnet portion 332 also generates a magnetic force that attracts the second movable member 220 and the compressor housing 100 to each other. For example, when the first housing member 110 is formed of a magnetic material, the magnet portions 331 and 332 may be omitted from the configuration of the centrifugal compressor CC. Also in this case, the magnet portions 313 and 323 generate a magnetic force that attracts each movable member and the compressor housing 100 to each other.

In the above, each movable member is held in the retracted position by the magnet portion 313, 323, 331, 332. However, each movable member is provided by a magnet portion provided in a portion of the compressor housing 100 that faces the movable member (specifically, the first movable member 210 or the second movable member 220) in the retracted position state in the direction of the rotation axis. It may be held in the retracted position.

For example, a magnet portion may be provided on a portion of the wall surface 112c of the accommodating groove 112b that faces the movable member in the rotation axis direction in the retracted position state. In this case, it is necessary that the magnetic material forms a movable member facing the magnet portion of the wall surface 112c in the retracted position state. Alternatively, it is necessary to provide the magnet portion of the movable member at a position facing the magnet portion of the wall surface 112c in the retracted position state. As a result, a magnetic force that holds the movable member in the retracted position can be generated.

For example, a magnet portion may be provided on a portion of the wall surface 122b (see FIG. 2) of the accommodating groove 122a that faces the movable member in the rotation axis direction in the retracted position state. In this case, it is necessary that the magnetic material forms a movable member facing the magnet portion of the wall surface 122b in the retracted position state. Alternatively, it is necessary to provide the magnet portion of the movable member at a position facing the magnet portion of the wall surface 122b in the retracted position state. As a result, a magnetic force that holds the movable member in the retracted position can be generated.

When the magnet portion is provided in the portion of the compressor housing 100 that faces the movable member in the retracted position in the direction of the rotation axis, the direction of the magnetic force generated by the magnet portion is orthogonal to the moving direction of the movable member. However, as in the example of FIG. 8, the direction of the magnetic force generated by the magnet portion is preferably the direction along the moving direction of the movable member. Thereby, the first movable member 210 and the second movable member 220 can be easily held in the retracted position by the magnetic force.

As described above, the part of the compressor housing 100 facing the movable member (specifically, the first movable member 210 or the second movable member 220) in the retracted position state, and the compressor in the movable member in the retracted position state. The first movable member 210 and the second movable member 220 can be held in the retracted position by the magnet portion provided on at least one of the portions closest to the housing 100.

As described above, in the present embodiment, the magnet portion 311, 312, 313, 321, 322, 323, 332, 332 is a movable member (specifically, the first movable member 210 or the first movable member 210 or the first movable member 210 in the compressor housing 100. 2 It is provided on a portion facing the movable member 220) and at least one of the movable members. As a result, when the first movable member 210 and the second movable member 220 are positioned at specific positions (for example, a protruding position or a retracted position), the magnet portions 311, 312, 313, 321, 322, 323, 331, and 332 are located. The first movable member 210 and the second movable member 220 can be held at a specific position. Therefore, when the first movable member 210 and the second movable member 220 are located at specific positions, the energization of the actuator 250 can be stopped. Therefore, heat generation in the actuator 250 is suppressed. As a result, deterioration of the performance of the actuator 250 due to demagnetization of the motor or the like is suppressed.

In the present embodiment, the magnet portion for the protruding position (specifically, the magnet portions 311 and 312, 321 and 322) for holding the first movable member 210 and the second movable member 220 at the protruding position and the first. A magnet portion (specifically, magnet portions 313, 323, 331, 332) for a retracted position that holds the movable member 210 and the second movable member 220 in the retracted position is provided in the centrifugal compressor CC. However, one of the magnet portion for the protruding position and the magnet portion for the retracted position may be omitted from the configuration of the centrifugal compressor CC. However, from the viewpoint of holding the position of each movable member at both the protruding position and the retracted position, it is preferable that both the magnet portion for the protruding position and the magnet portion for the retracted position are provided in the centrifugal compressor CC.

Although the embodiments of the present disclosure have been described above with reference to the attached drawings, it goes without saying that the present disclosure is not limited to such embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure. Will be done.

In the above, an example in which the actuator 250 is an electric cylinder has been described. However, the actuator 250 may be an electric actuator other than the electric cylinder. For example, the actuator 250 may be a solenoid type actuator. In that case, when the actuator 250 is energized, the drive shaft 251 moves to one side in the axial direction. When the actuator 250 is de-energized, the restoring force of the spring causes the drive shaft 251 to move to the other side in the axial direction.

In the above, an example in which two movable members, a first movable member 210 and a second movable member 220, are provided in the throttle mechanism (that is, the link mechanism 200) of the compressor housing 100 has been described, except that the number of movable members in the throttle mechanism. May be 1 or 3 or more. When the number of movable members is 3 or more, the state in which these plurality of movable members are in contact with each other corresponds to the protruding position state in the above example. When the number of movable members is 3 or more, the state in which these plurality of movable members are separated from each other corresponds to the retracted position state in the above example.

9: Compressor impeller 10: Intake port 100: Compressor housing (housing) 130: Intake flow path 210: First movable member (movable member) 220: Second movable member (movable member) 250: Actuator 311: Magnet part 312: Magnet Part 313: Magnet part 321: Magnet part 322: Magnet part 323: Magnet part 331: Magnet part 332: Magnet part CC: Centrifugal compressor TC: Supercharger

Claims (6)

1. A housing in which an intake flow path connected to the intake port is formed,
   The compressor impeller arranged in the intake flow path and
   A movable member arranged on the intake port side of the intake flow path with respect to the compressor impeller,
   An electric actuator connected to the movable member and
   A portion of the housing facing the movable member, and a magnet portion provided on at least one of the movable members.
   To prepare
   Centrifugal compressor.
2. Equipped with the plurality of the movable members
   The magnet portion is provided on at least one of the portion of the housing that faces the movable member when the plurality of movable members are in contact with each other and the portion of the movable member that abuts on the other movable member. Be,
   The centrifugal compressor according to claim 1.
3. Equipped with the plurality of the movable members
   The magnet portion is the portion of the housing that faces the movable member when the plurality of movable members are separated from each other, and the magnet portion is the most separated from the housing when the plurality of movable members of the movable member are separated from each other. Provided on at least one of the adjacent parts,
   The centrifugal compressor according to claim 1 or 2.
4. The direction of the magnetic force generated by the magnet portion is a direction along the moving direction of the movable member.
   The centrifugal compressor according to any one of claims 1 to 3.
5. The magnet portion holds the movable member in the specific position when the movable member is located in the specific position.
   The centrifugal compressor according to any one of claims 1 to 4.
6. A turbocharger provided with the centrifugal compressor according to any one of claims 1 to 5.

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