This centrifugal compressor is provided with an impeller mounted on a main shaft rotating around an axis line, and a vane device for adjusting the flow rate of a fluid in an inflow flow path to the impeller. The vane device includes: a plurality of vane main bodies provided at intervals in a circumf
This centrifugal compressor is provided with an impeller mounted on a main shaft rotating around an axis line, and a vane device for adjusting the flow rate of a fluid in an inflow flow path to the impeller. The vane device includes: a plurality of vane main bodies provided at intervals in a circumferential direction, wherein a mounting angle of the plurality of vane main bodies is changed by rotating the shaft portion; a plurality of link members which is rotated along with the shaft portion; a drive ring which is formed with an annular shape centered on the axis line and is moved in a moving direction along a rotation locus of the link member, and a drive mechanism which is connected to the drive ring and transmits a force in a tangential direction to the drive ring.
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1. A centrifugal compressor comprising: a main shaft which rotates around an axis line;a bladed wheel mounted on the main shaft; anda vane device which adjusts a flow rate of a fluid in an inflow flow path to the bladed wheel, whereinthe vane device comprises: a plurality of vane main bodies provide
1. A centrifugal compressor comprising: a main shaft which rotates around an axis line;a bladed wheel mounted on the main shaft; anda vane device which adjusts a flow rate of a fluid in an inflow flow path to the bladed wheel, whereinthe vane device comprises: a plurality of vane main bodies provided at intervals in a circumferential direction with respect to the axis line of the main shaft in the inflow flow path and each including a rotary shaft extending in a radial direction with respect to the axis line of the main shaft, wherein a mounting angle of the plurality of vane main bodies is changed by rotating the rotary shaft;a plurality of links, which are rotated along with respective rotary shafts, and which have a block shape, wherein a first end of each the plurality of links is connected to the respective rotary shafts;an annular member which is formed with an annular shape centered on the axis line and is moved in a moving direction along a rotation locus of the links, wherein the moving direction is both a axial direction and the circumferential direction, the rotation locus is generated by rotating with the vane main bodies, and the annular member is connected to a second end of each of the plurality of links; anda drive mechanism which is connected to the annular member and transmits a force in a tangential direction to the annular member,the drive mechanism comprises: an output shaft which is rotationally driven; anda transmission arm transmitting a rotational force from the output shaft to the annular member as a force in the tangential direction, wherein the a first end of the transmission arm is connected to the output shaft, and a second end of the transmission arm is connected to the annular member,the transmission arm comprises: a driving lever which is fixed to the output shaft, extends in a radial direction of the output shaft, and rotates along with the output shaft; anda driving link bar, wherein a first end of the driving link bar is connected to the driving lever, and a second end of the driving link bar is connected to the annular member,the driving link bar is provided with: a connecting rod-shaped portion, having ends, extending along the circumferential direction with respect to the axis line of the main shaft; andfirst and second universal joints provided at ends of the connecting rod-shaped portion, anda first end of the connecting rod-shaped portion is connected to the driving lever via the first universal joint, and a second end of the connecting rod-shaped portion is connected to the annular member via the second universal joint, andeach of the vane main bodies comprises a torque limiter which allows respective rotary shafts to perform relative rotation between the rotary shafts and respective links in a case where torque acting on the vane main body exceeds a threshold value set in advance. 2. The centrifugal compressor according to claim 1, wherein the universal joints comprise: two spherical bearings which are connected to the driving lever and the annular member; androd-shaped portions extending toward the connecting rod-shaped portion from the respective spherical bearings, thereby coming into contact with the connecting rod-shaped portion, and having a first threaded portion provided in a portion which is brought into contact with the connecting rod-shaped portion, andthe connecting rod-shaped portion is provided with a second threaded portion which is screwed with the first threaded portion. 3. The centrifugal compressor according to claim 1, further comprising: a torque detector which detects a torque of an electric motor; anda control section which reversely rotates the output shaft of the electric motor in a case where a detected value in the torque detector exceeds a threshold value set in advance. 4. A centrifugal compressor, comprising: a main shaft which rotates around an axis line;a bladed wheel mounted on the main shaft; anda vane device which adjusts a flow rate of a fluid in an inflow flow path to the bladed wheel, whereinthe vane device comprises: a plurality of vane main bodies provided at intervals in a circumferential direction with respect to the axis line of the main shaft in the inflow flow path and each including a rotary shaft extending in a radial direction with respect to the axis line of the main shaft, wherein a mounting angle of the plurality of vane main bodies is changed by rotating the rotary shaft;a plurality of links, which are rotated along with respective rotary shafts, and which have a block shape, wherein a first end of each the plurality of links is connected to respective rotary shafts;an annular member which is firmed with an annular shape centered on the axis line and is moved in a moving direction along a rotation locus of the links, wherein the moving direction is both a axial direction and the circumferential direction, the rotation locus is generated by rotating with the vane main bodies, and the annular member is connected to a second end of each of the plurality of links; anda drive mechanism which is connected to the annular member and transmits a force in a tangential direction to the annular member,the drive mechanism comprises: an output shaft which is rotationally driven; anda transmission arm transmitting a rotational force from the output shaft to the annular member as a force in the tangential direction, wherein the a first end of the transmission arm is connected to the output shaft, and a second end of the transmission arm is connected to the annular member,the transmission arm comprises: a driving lever which is fixed to the output shaft, extends in a radial direction of the output shaft, and rotates along with the output shaft; anda driving link structure, wherein a first end of the driving link structure is connected to the driving lever, and a second end of the driving link structure is connected to the annular member,the driving link structure is provided with: a connection portion extending in a direction away from the annular member; andfirst and second universal joints provided at the connection portion so as to be spaced apart from each other in at least one of the axial direction and a radial direction with respect to the axis line of the main shaft,a first end of the driving link structure is connected to the driving lever via the first universal joint on one side, and a second end of the driving link structure is connected to the annular member via the second universal joint on the other side,each of the vane main bodies comprises a torque limiter which allows respective rotary shafts to perform relative rotation between the rotary shafts and respective links in a case where torque acting on the vane main body exceeds a threshold value set in advance. 5. A centrifugal compressor comprising: a main shaft which rotates around an axis line;a bladed wheel mounted on the main shaft; anda vane device which adjusts a flow rate of a fluid in an inflow flow path to the bladed wheel, whereinthe vane device comprises: a plurality of vane main bodies provided at intervals in a circumferential direction with respect to the axis line of the main shaft in the inflow flow path and each including a rotary shaft extending in a radial direction with respect to the axis line of the main shaft, wherein a mounting angle of the plurality of vane main bodies is changed by rotating the rotary shaft;a plurality of links, which are rotated along with respective rotary shafts, and which have a block shape, wherein a first end of each the plurality of links is connected to respective rotary shafts;an annular member which is formed with an annular shape centered on the axis line and is moved in a moving direction along a rotation locus of the links, wherein the moving direction is both a axial direction and the circumferential direction, the rotation locus is generated by rotating with the vane main bodies, and the annular member is connected to a second end of each of the plurality of links; anda drive mechanism which is connected to the annular member and transmits a force in a tangential direction to the annular member,the drive mechanism comprises: an output shaft which is rotationally driven; anda transmission arm transmitting a rotational force from the output shaft to the annular member as a force in the tangential direction, wherein the a first end of the transmission arm is connected to the output shaft, and a second end of the transmission arm is connected to the annular member,the transmission arm comprises: a driving lever which is fixed to the output shaft, extends in a radial direction of the output shaft, and rotates along with the output shaft; anda driving link structure, wherein a first end of the driving link structure is connected to the driving lever, and a second end of the driving link structure is connected to the annular member,the driving link structure is provided with: a damper which is damping a force acting on the driving link structure, and is provided between the first end of the driving link structure and the second end of the driving link structure; andfirst and second universal joints provided at the damper, anda first end of the driving link is connected to the driving lever via the first universal joint on one side, and a second end of the driving link is connected to the annular member via the second universal joint on the other side, andeach of the vane main bodies comprises a torque limiter which allows respective rotary shafts to perform relative rotation between the rotary shafts and respective links in a case where torque acting on the vane main body exceeds a threshold value set in advance.
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