JP2018096303A - Rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a temperature difference occurring in a vehicle cabin and thereby reduce opening of a divided surface.SOLUTION: A rotary machine includes: a vehicle cabin 101 in which a storage space is formed by an upper half vehicle cabin 300 and a lower half vehicle cabin 200; a rotor 2 having a rotary shaft 3 which is rotatably stored in the storage space and a multi-stage impeller 4 fixed to an outer periphery of the rotary shaft 3; multiple diaphragms 51 covering a periphery of the rotor 2 in the storage space; and a discharge port forming body 91 which forms at least a part of a discharge port 58 which discharges a working fluid discharged from a last stage impeller 4 to the outside of the vehicle cabin 101 and extends from the upper half vehicle cabin 300 to the lower half vehicle cabin 200 at the inner side of the vehicle cabin 101. The discharge port forming body 91 has heat conductivity lower than that of the vehicle cabin 101.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating machine.

  The centrifugal compressor sucks in the process gas to be compressed, raises the pressure to a desired pressure, and supplies it to the next step. For example, a centrifugal compressor for a nitric acid plant sucks in a process gas of about 50 ° C., but the process gas is heated to about 200 ° C. as the pressure is increased.

  At that time, in the centrifugal compressor in which the flanges of the two divided compartments are bolted, thermal deformation occurs due to the temperature difference from the outlet to the bearing in addition to the temperature difference from the inlet to the outlet of the process gas. If it does so, the division | segmentation surface of two division | segmentation compartments will open, and there exists a possibility that a process gas may flow out of a compartment.

  Further, in a centrifugal compressor, washing water may be injected during operation to wash the inside of the machine, and the passenger compartment is rapidly cooled by the washing water supplied by this water injection, The temperature distribution changes unsteadily. As a result, a steep temperature difference occurs in the thickness direction of the passenger compartment, and the temperature difference causes thermal deformation that causes opening of the mouth around the dividing surface.

  Patent Document 1 proposes a means for suppressing leakage of high-pressure gas from the dividing surface. In Patent Document 1, the horizontal flange has a straight portion (2a) along the body portion (10a), a curved portion (2b) along the curved surface portion (10b), and a top portion near the top portion (10c) ( 2c), and the curved portion bolt interval (L2) of the curved portion (2b) is equal to the linear portion bolt interval (L1) of the linear portion (2a) and the top bolt interval (L3) of the top vicinity portion (2c). ) Is disclosed. According to Patent Document 1, it is possible to reduce the amount of reduction in surface pressure in the top vicinity portion (2c), and to suppress the opening in the top vicinity portion (2c).

JP 2013-249771 A

  However, in Patent Document 1, no consideration is given to leakage of the process gas from the divided surface based on the temperature difference generated in the centrifugal compressor.

  This invention is made | formed in view of the said situation, and it aims at providing the rotary machine which can reduce the opening of a division surface by relieving the temperature difference which arises in a vehicle interior.

The present invention employs the following means in order to solve the above problems.
A rotating machine according to a first aspect of the present invention includes a casing in which an accommodating space is formed by an upper half casing and a lower half casing, a rotating shaft rotatably accommodated in the accommodating space, A rotor having a plurality of stages of impellers fixed to the outer periphery of the rotation shaft, a plurality of diaphragms disposed in the housing space and covering the periphery of the rotor, and a working fluid discharged from the final stage of the impellers A discharge port forming body that forms at least a part of a discharge port that discharges to the outside of the vehicle compartment and extends from the upper half vehicle compartment to the lower half vehicle compartment inside the vehicle compartment, The outlet forming body has a lower thermal conductivity than the vehicle compartment.

  According to such a configuration, among the discharge ports through which the working fluid having the highest temperature circulates, the vicinity of the divided surface, which is a joint between the upper half vehicle compartment and the lower half vehicle compartment, is covered with the discharge port forming body. For this reason, the heat of the working fluid flowing through the discharge port is transmitted to the upper and lower vehicle compartments through the discharge port forming body. Thereby, in the upper half casing and the lower half casing around the discharge port forming body, the temperature rise due to the flow of the working fluid is alleviated. Thereby, the deformation | transformation of the upper half compartment and the lower half compartment in the vicinity of a division surface is reduced, and it is suppressed that a division surface opens.

  Moreover, in the rotary machine which concerns on the 2nd aspect of this invention, the said discharge port formation body may comprise the annular | circular shape extended over the perimeter of the circumferential direction of the said rotating shaft in a 1st aspect.

  By setting it as such a structure, the whole area | region of a discharge outlet is covered with a discharge outlet formation body. Therefore, all of the heat of the working fluid flowing through the discharge port is transmitted to the vehicle compartment via the discharge port forming body. As a result, in the passenger compartment, the temperature rise due to the process gas flowing through the discharge port is further alleviated. Thereby, the deformation | transformation of an upper half compartment and a lower half compartment is reduced more.

  Moreover, in the rotary machine according to the third aspect of the present invention, in the first aspect or the second aspect, the vehicle interior corresponds to a region where the discharge port forming body is provided, from an inner peripheral surface of the vehicle interior. A recessed receiving groove may be formed, and the discharge port forming body may be provided in the receiving groove.

  By setting it as such a structure, a discharge port formation body is provided, without making a discharge port formation body protrude largely from the inner surface of an upper half compartment and a lower half compartment. The discharge port forming body can be provided without hindering the flow state of the working fluid flowing through the discharge port.

  Moreover, in the rotating machine according to the fourth aspect of the present invention, in any one of the first aspect to the third aspect, the rotary machine is provided between the rotating shaft and the vehicle compartment, and seals the inside and outside of the vehicle compartment. And a seal heat shield that is provided between the seal portion and the vehicle compartment and accommodates the seal portion, wherein the seal heat shield has a lower thermal conductivity than the vehicle compartment. May be.

  By setting it as such a structure, the heat | fever of the seal gas supplied to a seal | sticker part is transmitted to an upper half vehicle compartment and a lower half vehicle compartment via a seal heat shield. This makes it difficult for heat to be transmitted to the upper and lower half passenger compartments, and makes it difficult for the temperatures of the upper and lower half passenger compartments to decrease in the region where the seal portion is installed. For this reason, in the upper half casing and the lower half casing around the seal heat shield, the temperature decrease due to the flow of the seal gas is alleviated. Thereby, the deformation | transformation of the upper half compartment and the lower half compartment around the division surface of the seal | sticker part vicinity is reduced, and it is suppressed that a division surface opens.

  Moreover, in the rotating machine according to the fifth aspect of the present invention, in any one of the first aspect to the fourth aspect, the flow direction of the working fluid is directed from the direction toward the outside in the radial direction of the rotation shaft to the inside. A curved flow path forming body that forms at least a part of a curved flow path that is turned in a direction, and the curved flow path forming body is disposed between the diaphragm and the vehicle compartment from the upper half vehicle compartment to the lower half of the vehicle. It extends over the passenger compartment and may have a lower thermal conductivity than the passenger compartment.

  By setting it as such a structure, the division | segmentation surface vicinity of the upper half compartment and lower half compartment of a curved flow path is covered with the curved flow path formation body. Therefore, the heat of the working fluid in which the curve flows through the flow path is transmitted to the upper half casing and the lower half casing through the bent flow path forming body. Therefore, the heat of the working fluid flowing through the curved flow path is transmitted to the upper and lower half vehicle compartments via the curved flow path forming body. Thereby, in the upper half casing and the lower half casing around the curved channel adult, the temperature rise due to the flow of the working fluid is alleviated. Thereby, the deformation | transformation of the upper half compartment and the lower half compartment around the division surface of the curved flow path vicinity is reduced, and it is suppressed that a division surface opens.

  Moreover, in the rotating machine according to the sixth aspect of the present invention, in any one of the first aspect to the fifth aspect, the rotary machine is provided between the rotating shaft and the vehicle compartment, and the rotating shaft is rotatable. A bearing portion to be supported; and a bearing heat shield that is provided between the bearing portion and the vehicle compartment and accommodates the bearing portion, wherein the bearing heat shield has a thermal conductivity higher than that of the vehicle compartment. It may be lowered.

  By setting it as such a structure, the heat | fever of the lubricating oil used by a bearing part is transmitted to an upper half vehicle compartment and a lower half vehicle compartment via a bearing heat shield. As a result, heat is not easily transmitted to the upper half passenger compartment and the lower half passenger compartment, and the temperatures of the upper half passenger compartment and the lower half passenger compartment in the region where the bearing portion is installed are unlikely to decrease. Therefore, the temperature drop due to the lubricating oil is alleviated in the upper and lower half casings around the bearing heat shield. Thereby, the deformation | transformation of the upper half compartment and the lower half compartment around the division surface of the bearing part vicinity is reduced, and it is suppressed that a division surface opens.

  According to the present invention, it is possible to reduce the opening of the dividing surface by reducing the temperature difference generated in the passenger compartment.

It is a longitudinal section showing a schematic structure of a centrifugal compressor concerning an embodiment of the present invention. It is the figure which looked at the upper half compartment in the embodiment of the present invention from the lower part of the perpendicular direction.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the rotating machine of the present embodiment is a single-shaft multi-stage centrifugal compressor (multi-stage centrifugal compressor) 1 including a plurality of impellers 4. In the centrifugal compressor 1 of the present embodiment, a part of the inside of the passenger compartment 101 is replaced with a plurality of members.

  The centrifugal compressor 1 includes a rotor 2, a diaphragm group 5, a seal device (seal portion) 6, a bearing device (bearing portion) 7, and a vehicle compartment assembly 100.

  The rotor 2 rotates about the axis O. The rotor 2 includes a rotating shaft 3 extending along the axis O and a plurality of impellers 4 that rotate together with the rotating shaft 3.

  A driving machine (not shown) such as a motor is connected to the rotating shaft 3. The rotating shaft 3 is rotationally driven by this driving machine. The rotary shaft 3 has a cylindrical shape centered on the axis O and extends in the axial direction Da in which the axis O extends. The rotating shaft 3 is rotatably supported by the bearing device 7 at both ends in the axial direction Da.

  The impeller 4 is fixed to the outer peripheral surface of the rotating shaft 3. The impeller 4 rotates together with the rotating shaft 3 to compress the process gas (working fluid) that is the object of compression using centrifugal force. An example of the process gas used in the present embodiment is nitric acid. The impeller 4 is provided in a plurality of stages in the axial direction Da with respect to the rotating shaft 3. The impeller 4 of the present embodiment is disposed between bearing devices 7 disposed on both sides of the rotational axis 3 in the axial direction Da. The impeller 4 is a so-called closed impeller provided with a cover 4a, a blade 4b, and a disk 4c. The impeller 4 defines a flow path through which process gas flows by a cover 4a, a blade 4b, and a disk 4c. An impeller group is constituted by a plurality of impellers 4 arranged in the same direction along the axial direction Da. The centrifugal compressor 1 of the present embodiment has one impeller group.

  The diaphragm group 5 covers the rotor 2 from the outside. The diaphragm group 5 includes a plurality of diaphragms 51 arranged in the axial direction Da corresponding to each of the plurality of impellers 4. The plurality of diaphragms 51 cover the periphery of the rotor 2. A plurality of diaphragms 51 are arranged so as to be stacked in the axial direction Da. In the diaphragm 51, a space capable of accommodating the impeller 4 is formed inside the radial direction Dr of the rotating shaft 3, which is a direction intersecting the axis O. The diaphragms 51 are connected to each other to define a flow path through which the process gas flows together with the flow path of the impeller 4.

  Here, specifically, the flow path formed by the diaphragm 51 will be described in order from the upstream side that is one side (first side) in the axial direction Da. In this embodiment, the diaphragm group 5 includes a suction port 52, a suction flow channel 53, a plurality of diffuser flow channels 54, a plurality of bent flow channels 55, a plurality of return flow channels 56, in order from the upstream side where the process gas flows. A discharge channel 57 and a discharge port 58 are defined together with a vehicle compartment 101 to be described later.

  The suction port 52 allows the process gas to flow into the suction flow path 53 from the outside. The suction port 52 allows the process gas flowing from the outside of the passenger compartment 101 to flow into the diaphragm group 5. The suction port 52 is connected to the suction flow channel 53 while gradually decreasing the flow channel area from the outer side in the radial direction Dr toward the inner side in the radial direction Dr.

  The suction flow channel 53 causes the process gas to flow from the outside into the impeller 4 arranged on the most upstream side among the plurality of impellers 4 arranged in the axial direction Da together with the suction port 52. The suction channel 53 extends from the suction port 52 to the inside in the radial direction Dr. The suction flow path 53 is connected to an inlet facing the upstream side of the impeller 4 while changing its direction from the radial direction Dr to the downstream side which is the other side (second side) of the axial direction Da.

  In the diffuser flow path 54, the process gas that has flowed out of the impeller 4 to the outside in the radial direction Dr flows. The diffuser flow path 54 is connected to an outlet that faces the outer side of the radial direction Dr of the impeller 4. The diffuser flow path 54 extends from the outlet of the impeller 4 toward the outside in the radial direction Dr, and is connected to the curved flow path 55.

  The bent flow path 55 turns the process gas flow direction from a direction toward the outside of the radial direction Dr to a direction toward the inside of the radial direction Dr. That is, the bent flow channel 55 is a U-shaped flow channel when viewed from the radial direction Dr. The curved channel 55 is formed between the outer peripheral surface of the diaphragm group 5 and the inner peripheral surface of the vehicle interior 101.

  The return flow path 56 allows the process gas flowing through the curved flow path 55 to flow into the impeller 4. The return flow path 56 gradually increases in width while extending toward the inside in the radial direction Dr. The return flow path 56 changes the flow direction of the process gas so as to go downstream in the axial direction Da inside the radial direction Dr of the diaphragm group 5.

  The discharge flow path 57 circulates the process gas discharged from the final stage impeller 4 arranged on the most downstream side among the plurality of impellers 4 arranged in the axial direction Da to the discharge port 58. The discharge channel 57 extends from the final stage impeller 4 to the outside in the radial direction Dr. The discharge channel 57 is connected to the inlet facing the upstream side of the impeller 4 while changing the direction from the radial direction Dr to the downstream side which is the other side of the axial direction Da.

  The discharge port 58 discharges the process gas discharged from the final stage impeller 4 flowing through the discharge flow channel 57 to the outside of the vehicle interior 101. The discharge port 58 discharges the process gas flowing through the inside of the diaphragm group 5 to the outside of the vehicle interior 101. The discharge port 58 is connected to the discharge flow channel 57 while gradually decreasing the flow channel area from the outer side in the radial direction Dr toward the inner side in the radial direction Dr.

  The sealing device 6 prevents the process gas from leaking from the inside of the passenger compartment 101 to the outside. The sealing device 6 seals the outer peripheral surface of the rotating shaft 3 over the entire circumference. For example, a labyrinth seal is used as the sealing device 6 of the present embodiment. The sealing device 6 is provided on both sides in the axial direction Da with the diaphragm group 5 interposed therebetween. A part of the process gas is supplied to the sealing device 6 as a sealing gas.

  The bearing device 7 supports the rotary shaft 3 so as to be rotatable in the circumferential direction Dc. The bearing device 7 is provided between the rotating shaft 3 and the vehicle interior 101. The bearing device 7 is provided outside the seal device 6 in the axial direction Da. The bearing device 7 is provided on both sides of the axial direction Da across the diaphragm group 5 and the seal device 6.

  The vehicle interior assembly 100 constitutes a vehicle interior 101 that houses the rotor 2, the diaphragm group 5, the seal device 6, and the bearing device 7. As shown in FIGS. 1 and 2, the vehicle compartment assembly 100 includes a lower half compartment 200, an upper half compartment 300, a fixing portion 400, a seal housing 500, a seal member 600, and a first flow path formation. A body (discharge port forming body) 91, a second flow path forming body (curved flow path forming body) 92, a third flow path forming body 93, a seal heat shield 94, and a bearing heat shield 95. ing.

  The lower half passenger compartment 200 is fixed on the floor surface. A part of the suction port 52 is formed in the lower half passenger compartment 200 so as to open downward in the vertical direction Dv. A part of the discharge port 58 is formed in the lower half casing 200 so as to open downward in the vertical direction Dv.

  The upper half passenger compartment 300 is fixed on the lower half passenger compartment 200 as shown in FIG. The shape of the upper half casing 300 when viewed from below in the vertical direction Dv is substantially the same as the shape when the lower half casing 200 is viewed from above in the vertical direction Dv. The upper half casing 300 is combined with the lower half casing 200 to form a horizontally divided casing 101.

  The vehicle interior 101 forms the exterior of the centrifugal compressor 1. The vehicle interior 101 is formed in a cylindrical shape. The vehicle interior 101 is formed such that the central axis coincides with the axis O of the rotation shaft 3. The vehicle interior 101 has a housing space formed therein. The vehicle interior 101 accommodates the diaphragm group 5 in the accommodation space. The vehicle interior 101 accommodates the rotating shaft 3 and the impeller 4 in a rotatable state within the accommodating space. The vehicle interior 101 accommodates the sealing device 6 and the bearing device 7 in the accommodation space.

  Hereinafter, a more specific configuration of the vehicle interior 101 will be described. However, the lower half vehicle compartment 200 and the upper half vehicle compartment 300 have substantially the same configuration except that the arrangement positions thereof are different. The upper half passenger compartment 300 will be described as an example.

As shown in FIG. 2, the upper half casing 300 has an upper half flange surface 310 and an upper half accommodating recess 350.
The upper half flange surface 310 is a horizontal plane that faces downward in the vertical direction Dv. The upper half flange surface 310 is one of the divided surfaces when the vehicle interior 101 is divided in the vertical direction. A plurality of through holes 402 through which fastening bolts are inserted are formed in the upper half flange surface 310. The through hole 402 is recessed upward from the upper half flange surface 310 in the vertical direction Dv. A plurality of through holes 402 are formed at intervals along the direction in which the upper half flange surface 310 extends. The through hole 402 is formed so as to match the position of the fixing hole on the flange surface (lower half flange surface, not shown) of the lower half compartment 200 when the upper half compartment 300 is combined with the lower half compartment 200. Has been. The upper half flange surface 310 has a first upper half flange surface 311 and a second upper half flange surface 312.

  The first upper half flange surface 311 is connected to an upper half large-diameter recess 351 described later in the upper half accommodating recess 350. Two first upper half flange surfaces 311 are formed apart in the width direction Dw across the axis O when viewed from above in the vertical direction Dv. The first upper half flange surface 311 is a plane that extends long in the axial direction Da. A flange surface (first lower half flange surface, not shown) similar to the first upper half flange surface 311 is provided in the lower half casing 200.

  The second upper half flange surface 312 is connected to an upper half small-diameter recess 352 described later in the upper half accommodating recess 350. The second upper half flange surface 312 is formed on both sides of the first upper half flange surface 311 in the axial direction Da. The second upper half flange surface 312 is a plane continuous with the first upper half flange surface 311. The second upper half flange surface 312 is disposed on the inner side in the width direction Dw than the first upper half flange surface 311 when viewed from above in the vertical direction Dv. A flange surface (second lower half flange surface, not shown) similar to the second upper half flange surface 312 is provided in the lower half casing 200.

  The upper half accommodating recess 350 is recessed upward from the upper half flange surface 310 in the vertical direction Dv. The upper half accommodating recess 350 is a space covered with the inner surface of the upper half passenger compartment 300 when viewed from below in the vertical direction Dv. A housing space extending around the axis O is formed in the interior of the vehicle interior 101 by a similar recess (lower half housing recess, not shown) formed in the lower half housing 200 and an upper half housing recess 350. . Members such as the rotor 2, the diaphragm group 5, the seal device 6, and the bearing device 7 are disposed in the housing space. The upper half accommodating recess 350 includes an upper half large diameter recess 351, an upper half small diameter recess 352, and an upper half step surface 353.

  The upper half large-diameter recess 351 is a space for housing the diaphragm group 5 together with the same recess (lower half large-diameter recess, not shown) of the lower half passenger compartment 200. The upper half large-diameter recess 351 extends in the axial direction Da. The upper half large-diameter recess 351 is formed to be recessed from the first upper half flange surface 311. The upper half large-diameter recess 351 is a space formed around the axis O. The upper half large-diameter recess 351 is formed inside the width direction Dw so as to be sandwiched between the two first upper half flange surfaces 311 when viewed from below in the vertical direction Dv. The upper half large-diameter recess 351 has a substantially rectangular shape when viewed from below in the vertical direction Dv.

  The upper half small-diameter concave portion 352 is a space for housing the seal device 6 and the bearing device 7 together with the same concave portion (lower half small-diameter concave portion, not shown) of the lower half casing 200. The upper half small diameter recess 352 is adjacent to the upper half large diameter recess 351 in the axial direction Da and extends in the axial direction Da. The upper half small-diameter recess 352 is a space connected to the upper half large-diameter recess 351 in the axial direction Da. The upper half small diameter recess 352 is formed on both sides of the upper half large diameter recess 351 in the axial direction Da so as to sandwich the upper half large diameter recess 351. The upper half small-diameter recess 352 is formed to be recessed from the second upper half flange surface 312. The upper half small-diameter recess 352 is a space formed around the axis O. The upper half small-diameter recess 352 is formed on the inner side in the width direction Dw so as to be sandwiched between the two second upper half flange surfaces 312 when viewed from below in the vertical direction Dv. The upper half small-diameter recess 352 is formed to have a smaller size in the radial direction Dr than the upper half large-diameter recess 351. That is, the upper half small-diameter recess 352 has a rectangular shape smaller than the upper half large-diameter recess 351 when viewed from below in the vertical direction Dv.

  The upper half step surface 353 is a surface that is formed between the upper half large-diameter recess 351 and the upper half small-diameter recess 352 and extends in the radial direction Dr. The upper half step surface 353 is a part of the surface that defines the upper half large-diameter recess 351. Specifically, the upper half step surface 353 is a part of the inner surface facing the axial direction Da of the upper half casing 300 forming the upper half large-diameter recess 351. The upper half step surface 353 is directly connected to the upper half flange surface 310. The upper half step surface 353 on one side in the axial direction Da forms a part of the suction port 52. The upper half step surface 353 on the other side in the axial direction Da forms a part of the discharge port 58. A plane (lower half step surface, not shown) similar to the upper half step surface 353 is provided in the lower half casing 200.

  The fixing portion 400 has the lower half casing 200 and the upper half casing 300 so as to form an accommodation space in a state where the flange surface of the lower half casing 200 (not shown) and the upper half flange face 310 are in contact with each other. And fix. The fixing part 400 according to the present embodiment is inserted into the fixing hole formed in the flange surface of the lower half casing 200, the through hole 402 formed in the upper half flange surface 310, and the through hole 402. A fastening bolt (not shown) screwed into the fixing hole;

  The seal housing 500 is disposed in the accommodation space. One seal housing 500 is provided in each of the spaces formed by the upper half-small-diameter concave portion 352 and the lower half-small-diameter concave portion which are spaces on one side and the other side in the axial direction Da in the accommodation space. The seal device 6 can be fixed inside the seal housing 500. The seal housing 500 has a cylindrical shape with the axis O as the center. The seal shaft 500 is inserted into the seal housing 500 with the seal device 6 fixed inside. The seal housing 500 is fixed to the upper half vehicle compartment 300 and the lower half vehicle compartment 200 via a seal member 600.

  The seal member 600 seals between the upper half casing 300 and the lower half casing 200 and the seal housing 500. The seal member 600 is provided on the outer peripheral surface of the seal housing 500. The seal member 600 is in contact with the inner peripheral surface of the upper half small-diameter recess 352 and the inner peripheral surface of the lower half casing 200 facing the upper half small-diameter recess 352. The seal member 600 of this embodiment is an O-ring. One seal member 600 is provided at the inner end in the axial direction Da with respect to the outer peripheral surface of the seal housing 500.

  The first flow path forming body 91 blocks heat transfer between the discharge port 58 and the vehicle interior 101 so that the heat of the process gas flowing through the discharge port 58 is not easily transmitted to the vehicle interior 101. As shown in FIGS. 1 and 2, the first flow path forming body 91 forms at least a part of the discharge port 58. The first flow path forming body 91 extends from the upper half passenger compartment 300 to the lower half passenger compartment 200 inside the passenger compartment 101. That is, the first flow path forming body 91 is formed so that the position in the circumferential direction Dc of the rotating shaft 3 straddles the dividing surface of the upper half casing 300 and the lower half casing 200 when viewed from the axial direction Da. Yes. The first flow path forming body 91 is disposed between the diaphragm 51 and the vehicle interior 101 when viewed from the axial direction Da. The first flow path forming body 91 of the present embodiment has an annular shape extending over the entire circumference in the circumferential direction Dc. The first flow path forming body 91 is formed with a constant thickness over the entire region covering the discharge port 58.

  The first flow path forming body 91 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. Specifically, the first flow path forming body 91 of the present embodiment is disposed so as to form an air layer between the vehicle interior 101 and is made of the same metal material as the vehicle interior 101.

  The first flow path forming body 91 is not limited to structurally lower thermal conductivity than the vehicle interior 101. The first flow path forming body 91 only needs to have a lower thermal conductivity than the passenger compartment 101. Therefore, the first flow path forming body 91 may be, for example, a resin material, may be a resin or metal coating, may be a resin, metal, or a lining of a heat insulating material, and may be a porous heat insulating material. It may be a heat insulating material.

  The first flow path forming body 91 of the present embodiment is accommodated in a first accommodation groove (accommodation groove) 91a formed in the upper half compartment 300 and the lower half compartment 200 so as to replace a part of the compartment 101. It is fixed in the state. The first receiving groove 91 a is recessed from the inner peripheral surfaces of the upper half casing 300 and the lower half casing 200 corresponding to the region where the first flow path forming body 91 is provided. Specifically, in the upper half casing 300, the first accommodation groove 91a is formed on the inner surface facing the inside in the width direction Dw of the other end portion of the upper half large-diameter recess 351 in the axial direction Da. Similarly, the first accommodation groove 91a is also formed in the lower half trapezoidal recess of the lower half compartment 200. The first accommodation groove 91 a is formed in an annular shape along the inner peripheral surface of the passenger compartment 101. As a result, the first flow path forming body 91 does not protrude inside the upper half large-diameter recess 351 and the lower half trapezoidal recess, and the surface forming the discharge port 58 is the same as that of the upper half casing 300 and the lower half casing 200. It is arranged in a state flush with the inner peripheral surface.

  The second flow path forming body 92 blocks heat transfer between the curved flow path 55 and the vehicle interior 101 so that the heat of the process gas flowing through the curved flow path 55 is not easily transmitted to the vehicle interior 101. The second flow path forming body 92 forms at least a part of the curved flow path 55. A curved flow path 55 is formed between the inner peripheral surface of the second flow path forming body 92 and the outer peripheral surface of the diaphragm group 5. In the centrifugal compressor 1 of this embodiment, all the curved flow paths 55 are formed by the second flow path forming body 92.

  The second flow path forming body 92 extends from the upper half passenger compartment 300 to the lower half passenger compartment 200 inside the passenger compartment 101. In other words, the second flow path forming body 92 is formed so that the position in the circumferential direction Dc of the rotating shaft 3 straddles the divided surfaces of the upper half passenger compartment 300 and the lower half passenger compartment 200 when viewed from the axial direction Da. ing. The second flow path forming body 92 is disposed between the diaphragm 51 and the vehicle interior 101 when viewed from the axial direction Da. The second flow path forming body 92 of the present embodiment has an annular shape extending with a constant thickness over the entire circumference in the circumferential direction Dc.

  The second flow path forming body 92 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. Specifically, the second flow path forming body 92 of the present embodiment is disposed so as to form an air layer between the vehicle interior 101 and is made of the same metal material as the vehicle interior 101.

  The second flow path forming body 92 is not limited to structurally lower thermal conductivity than the vehicle interior 101. The second flow path forming body 92 only needs to have a lower thermal conductivity than the vehicle interior 101. Therefore, the second flow path forming body 92 may be, for example, a resin material, a resin or metal coating, a lining of resin, metal, or a heat insulating material. It may be a heat insulating material such as a material.

  The second flow path forming body 92 is fixed in a state of being accommodated in a second accommodation groove 92 a formed in the upper half casing 300 and the lower half casing 200 so as to replace a part of the casing 101. Yes. The second accommodation groove 92 a is recessed from the inner peripheral surface of the vehicle interior 101 corresponding to the region where the second flow path forming body 92 is provided. Specifically, the second housing groove 92a is formed on the inner surface facing the inside in the width direction Dw on one side of the axial direction Da with respect to the first housing groove 91a in the upper half large-diameter recess 351 in the upper half casing 300. Has been. In the lower half casing 200, the second housing groove 92a is formed on the inner surface facing the inside in the width direction Dw on one side of the axial direction Da from the first housing groove 91a in the lower half large-diameter recess. The second accommodation groove 92 a is formed in an annular shape along the inner peripheral surface of the passenger compartment 101. As a result, the second flow path forming body 92 does not protrude inside the upper half large-diameter recess 351 and the lower half large-diameter recess, and the surface on which the curved flow path 55 is formed is the upper half casing 300 and the lower half car. It is arranged in a state flush with the inner peripheral surface of the chamber 200.

  The second flow path forming body 92 has a main body 921 formed in an annular shape and a flow path forming recess 922 that is recessed from the inner peripheral surface of the main body 921 toward the outer peripheral surface. The flow path forming recess 922 is formed in an annular shape on the inner peripheral surface side of the main body 921 so as to continue from one end to the other end in the circumferential direction Dc.

  The third flow path forming body 93 is disposed between the suction port 52 and the suction flow path 53 and the vehicle interior 101 so that the heat of the process gas flowing through the suction port 52 and the suction flow path 53 is not easily transmitted to the vehicle interior 101. Blocks heat transfer. As shown in FIGS. 1 and 2, the third flow path forming body 93 forms a suction port 52 and a suction flow path 53. The third flow path forming body 93 extends from the upper half passenger compartment 300 to the lower half passenger compartment 200 inside the passenger compartment 101. In other words, the third flow path forming body 93 is formed so that the position in the circumferential direction Dc of the rotating shaft 3 straddles the divided surfaces of the upper half casing 300 and the lower half casing 200 when viewed from the axial direction Da. ing. The third flow path forming body 93 is disposed between the diaphragm 51 and the vehicle interior 101 when viewed from the axial direction Da. The third flow path forming body 93 is provided facing the upper half step surface 353 and the lower half step surface on one side in the axial direction Da. The third flow path forming body 93 of the present embodiment has an annular shape extending over the entire circumference in the circumferential direction Dc. The third flow path forming body 93 is formed with a constant thickness over the entire region covering the suction port 52 and the suction flow path 53.

  The third flow path forming body 93 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. Specifically, the third flow path forming body 93 of the present embodiment is disposed so as to form an air layer between the vehicle interior 101 and is made of the same metal material as the vehicle interior 101.

  The third flow path forming body 93 is not limited to structurally lower thermal conductivity than the vehicle interior 101. The third flow path forming body 93 only needs to have a lower thermal conductivity than the passenger compartment 101. Therefore, the third flow path forming body 93 may be, for example, a resin material, a resin or metal coating, a lining of resin, metal, or a heat insulating material, and a porous body heat insulating material. It may be a heat insulating material such as a material.

  The third flow path forming body 93 of the present embodiment is accommodated in a third accommodation groove 93a formed in the upper half compartment 300 and the lower half compartment 200 so as to replace a part of the compartment 101. It is fixed with. The third accommodation groove 93 a is recessed from the inner peripheral surface of the vehicle interior 101 corresponding to the region where the third flow path forming body 93 is provided. Specifically, the third accommodation groove 93 a is formed at one end of the upper half large-diameter recess 351 in the axial direction Da in the upper half casing 300. Further, the third accommodation groove 93a is formed at one end of the lower half large-diameter recess in the axial direction Da in the lower half passenger compartment 200. That is, the third accommodation groove 93a is formed on the inner surface of the upper half large-diameter recess 351 and the lower half large-diameter recess that faces the inner side in the width direction Dw on one side of the axial direction Da with respect to the second accommodation groove 92a. . The third accommodation groove 93 a is formed in an annular shape along the inner peripheral surface of the passenger compartment 101. As a result, the third flow path forming body 93 does not protrude inside the upper half large-diameter recess 351 and the lower half large-diameter recess, and the surface forming the suction port 52 and the suction flow path 53 is the upper half casing 300. And it arrange | positions in the state flush | planar with the internal peripheral surface of the lower half compartment 200.

  The seal heat shield 94 blocks heat transfer between the seal device 6 and the vehicle interior 101 so that the heat of the seal gas used around the seal member 600 is not easily transmitted to the vehicle interior 101. The seal heat shield 94 can accommodate the seal member 600, the seal housing 500, and the seal device 6 therein. The seal heat shield 94 of the present embodiment is provided only on the side corresponding to the seal device 6 on the side close to the final stage among the seal devices 6 on both sides in the axial direction Da.

  The seal heat shield 94 extends from the upper half passenger compartment 300 to the lower half passenger compartment 200 inside the passenger compartment 101. That is, the seal heat shield 94 is formed so that the position in the circumferential direction Dc of the rotating shaft 3 straddles the dividing surface of the upper half vehicle compartment 300 and the lower half vehicle compartment 200 when viewed from the axial direction Da. . The seal heat shield 94 according to the present embodiment is disposed between the seal member 600 and the passenger compartment 101 when viewed from the axial direction Da.

  The seal heat shield 94 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. Specifically, the seal heat shield 94 of the present embodiment is disposed so as to form an air layer between the passenger compartment 101 and is made of the same metal material as the passenger compartment 101.

  The seal heat shield 94 is not limited to structurally lower thermal conductivity than the vehicle interior 101. The seal heat shield 94 only needs to have a lower thermal conductivity than the passenger compartment 101. Therefore, the seal heat shield 94 may be, for example, a resin material, may be a resin or metal coating, may be a resin, metal, or a lining of a heat insulating material, such as a porous heat insulating material. The heat insulating material may be used.

In addition, the seal heat shield 94 of the present embodiment includes a first heat shield body 941 that extends between the diaphragm 51 in the final stage and the vehicle interior 101, and a second heat shield that extends between the seal member 600 and the vehicle interior 101. And a heat main body 942.
The first heat shield body 941 is provided to face the upper half step surface 353 and the lower half step surface of the other side in the axial direction Da. The first heat shield body 941 has a disk shape along the upper half step surface 353 and the lower half step surface.
The second heat shield body 942 has a cylindrical shape along the inner peripheral surfaces of the upper half small-diameter recess 352 and the lower half small-diameter recess.

  The seal heat shield 94 is fixed in a state of being accommodated in a fourth accommodation groove 94 a formed in the upper half compartment 300 and the lower half compartment 200 so as to replace a part of the compartment 101. The fourth accommodation groove 94a is recessed from the inner peripheral surface of the vehicle interior 101 corresponding to the region where the seal heat shield 94 is provided. Specifically, in the upper half passenger compartment 300, the fourth accommodation groove 94a is formed by an end portion on the other side in the axial direction Da of the upper half large-diameter recess 351 and an upper half small-diameter recess 352 on the other side in the axial direction Da. It is formed to be continuous. In the upper half large-diameter recess 351, the fourth accommodation groove 94a is formed in a size that can accommodate the first heat shield on the upper half step surface 353 on the other side in the axial direction Da. In the upper half small-diameter recess 352, the fourth accommodation groove 94a is formed in a size capable of accommodating the second heat shield on the inner surface facing the inner side in the width direction Dw. Further, in the lower half casing 200, the fourth accommodation groove 94a is formed so as to be continuous with the end portion on the other side in the axial direction Da of the lower half large-diameter recess and the lower half small-diameter recess on the other side in the axial direction Da. Has been. In the lower half large-diameter recess, the fourth housing groove 94a is formed in a size that can accommodate the first heat shield on the lower half step surface of the other side in the axial direction Da. The fourth housing groove 94a is formed in a size that can accommodate the second heat shield on the inner surface facing the inner side in the width direction Dw in the lower half small-diameter concave portion. The fourth accommodation groove 94 a is formed over the entire circumference along the inner peripheral surface of the passenger compartment 101. As a result, the seal heat shield 94 is arranged so that the surface contacting the seal member 600 is flush with the inner peripheral surfaces of the upper half vehicle compartment 300 and the lower half vehicle compartment 200 without protruding inside the accommodation space. Has been.

  The bearing heat shield 95 blocks heat transfer between the bearing device 7 and the vehicle interior 101 so that the heat of the lubricating oil used in the bearing device 7 is not easily transmitted to the vehicle interior 101. The bearing heat shield 95 is provided between the bearing device 7 and the vehicle interior 101. The bearing heat shield 95 can accommodate the bearing device 7 therein. The bearing heat shield 95 of the present embodiment is provided only on the side corresponding to the bearing device 7 on the side close to the final stage among the bearing devices 7 on both sides in the axial direction Da. The bearing heat shield 95 is provided on the other side in the axial direction Da with respect to the seal heat shield 94.

  The bearing heat shield 95 extends from the upper half passenger compartment 300 to the lower half passenger compartment 200 inside the passenger compartment 101. In other words, the bearing heat shield 95 is formed so that the position in the circumferential direction Dc of the rotating shaft 3 straddles the divided surfaces of the upper half casing 300 and the lower half casing 200 when viewed from the axial direction Da. . The bearing heat shield 95 of the present embodiment has a cylindrical shape extending with a constant thickness over the entire circumference in the circumferential direction Dc.

  The bearing heat shield 95 is formed so that its thermal conductivity is lower than that of the passenger compartment 101. Specifically, the bearing heat shield 95 of the present embodiment is disposed so as to form an air layer between the passenger compartment 101 and is made of the same metal material as the passenger compartment 101.

  The bearing heat shield 95 is not limited to structurally lower thermal conductivity than the passenger compartment 101. The bearing heat shield 95 only needs to have a lower thermal conductivity than the passenger compartment 101. Therefore, the bearing heat shield 95 may be, for example, a resin material, may be a resin or metal coating, may be a resin, a metal, or a lining of a heat insulating material, and may be a porous heat insulating material or the like. The heat insulating material may be used.

  The bearing heat shield 95 is fixed in a state of being accommodated in a fifth accommodating groove 95 a formed in the upper half casing 300 and the lower half casing 200 so as to replace a part of the casing 101. The fifth housing groove 95a is recessed from the inner peripheral surface of the vehicle interior 101 corresponding to the region where the bearing heat shield 95 is provided. Specifically, the fifth accommodation groove 95 a is formed only in the upper half small-diameter recess 352 on the other side in the axial direction Da in the upper half casing 300. The fifth housing groove 95a is formed only in the lower half small-diameter concave portion on the other side in the axial direction Da in the lower half casing 200. The fifth housing groove 95a is formed on the other side in the axial direction Da with respect to the fourth housing groove 94a. In the upper half small-diameter recess 352 and the lower half small-diameter recess, the fifth receiving groove 95a is formed on the inner surface facing the inner side in the width direction Dw. The fifth accommodation groove 95 a is formed in a cylindrical shape along the inner peripheral surface of the passenger compartment 101. As a result, the bearing heat shield 95 does not protrude inside the upper half small-diameter recess 352 and the lower half small-diameter recess, and the surface in contact with the bearing device 7 is the inner periphery of the upper half casing 300 and the lower half casing 200. It is arranged flush with the surface.

  In the centrifugal compressor 1 as described above, the rotor assembly 2, the diaphragm group 5, the seal device 6, and the bearing device 7 are accommodated in the accommodating space in the casing assembly 100 without the upper half casing 300. Thereafter, in a state where the rotor 2 and the diaphragm group 5 to which the seal device and the bearing device 7 are attached are placed on the lower half compartment 200, the upper half compartment 300 is placed from above in the vertical direction Dv. In this state, the fastening bolt is inserted into the through hole 402 of the upper half casing 300 and the tip portion is screwed into the fixing hole on the lower half casing 200 side. Thereby, the centrifugal compressor 1 which has the compartment 101 and the rotor 2 arrange | positioned inside the compartment 101 is assembled.

  When such a centrifugal compressor 1 is operated, a high-pressure process gas flows and a large pressure is generated in a space where the diaphragm group 5 and the like are arranged. When such a large pressure is generated, there is a possibility that the process gas leaks from the dividing surface between the upper half casing 300 and the lower half casing 200.

  In addition to the problem of pressure, there is a possibility that the dividing surface opens due to the temperature rise accompanying the pressure increase of the process gas. For example, if the centrifugal compressor 1 is for a nitric acid plant, the process gas at about 50 ° C. is heated to about 200 ° C. as the pressure increases. Therefore, a difference occurs in the amount of heat transmitted from the process gas from one side of the axial direction Da to the other side. As a result, a temperature difference occurs in the vehicle interior 101 from one side to the other side in the axial direction Da. As the temperature difference increases, the thermal deformation that occurs in the upper half passenger compartment 300 and the lower half passenger compartment 200 increases.

  However, according to the centrifugal compressor 1 as described above, the discharge port 58 through which the hottest process gas flows is formed by the first flow path forming body 91 extending from the upper half compartment 300 to the lower half compartment 200. Has been. As a result, the first flow path forming body 91 covers the vicinity of the dividing surface of the upper half casing 300 and the lower half casing 200 in the discharge port 58. Therefore, the process gas flowing through the discharge port 58 touches the first flow path forming body 91 without directly touching the vehicle interior 101 (lower half vehicle interior 200, upper half vehicle interior 300). As a result, the heat of the process gas flowing through the discharge port 58 is transmitted to the upper half casing 300 and the lower half casing 200 via the first flow path forming body 91. Here, the first flow path forming body 91 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. Accordingly, heat is not easily transmitted to the upper half passenger compartment 300 and the lower half passenger compartment 200, and the temperatures of the upper half passenger compartment 300 and the lower half passenger compartment 200 in the vicinity of the dividing surface are hardly increased. Therefore, the temperature rise due to the process gas flowing is reduced in the upper half casing 300 and the lower half casing 200 around the first flow path forming body 91. Thereby, the deformation | transformation of the upper half compartment 300 and the lower half compartment 200 near a division surface is reduced, and it is suppressed that a division surface opens. Therefore, the opening of the dividing surface can be reduced by reducing the temperature difference generated in the passenger compartment 101. In addition, thermal stress that causes plastic deformation of the passenger compartment 101 can be reduced.

  Moreover, in order to wash | clean the inside of the centrifugal compressor 1, the wash water colder than a process gas may be inject | poured during a driving | running (water injection, Water Injection). When washing water is supplied by this water injection, the passenger compartment 101 is rapidly cooled, and the temperature distribution in the passenger compartment 101 changes unsteadily. As a result, a steep temperature difference occurs in the thickness direction of the passenger compartment 101, and the temperature difference also causes thermal deformation that causes an opening on the divided surface and its periphery. In particular, this temperature difference becomes conspicuous on the rear stage side where the degree of pressure increase is large.

  However, even in such a case, since the discharge port 58 is covered with the first flow path forming body 91, the wash water flowing through the discharge port 58 is allowed to flow into the vehicle interior 101 (lower half vehicle interior 200, upper The first flow path forming body 91 is touched without directly touching the half vehicle compartment 300). As a result, the heat of the washing water flowing through the discharge port 58 is transmitted to the upper half casing 300 and the lower half casing 200 through the first flow path forming body 91. Accordingly, heat is not easily transmitted to the upper half passenger compartment 300 and the lower half passenger compartment 200, and the temperatures of the upper half passenger compartment 300 and the lower half passenger compartment 200 in the vicinity of the dividing surface are hardly lowered. Therefore, the temperature drop due to the flow of the washing water is alleviated in the upper half casing 300 and the lower half casing 200 around the first flow path forming body 91. Thereby, the deformation | transformation of the upper half compartment 300 and the lower half compartment 200 around the division surface of the discharge port 58 vicinity is reduced. Therefore, the opening of the dividing surface can be reduced by reducing the temperature difference generated in the passenger compartment 101. In addition, thermal stress that causes plastic deformation of the casing 101 around the dividing surface in the vicinity of the discharge port 58 can be reduced.

  Further, not only the vicinity of the dividing surface but also the entire region of the discharge port 58 is covered with the first flow path forming body 91. Therefore, all of the heat of the process gas and the cleaning water flowing through the discharge port 58 is transmitted to the vehicle interior 101 via the first flow path forming body 91. As a result, in the passenger compartment 101, the temperature increase due to the process gas flowing through the discharge port 58 and the temperature decrease due to the flow of cleaning water are alleviated. Thereby, the deformation | transformation of the upper half compartment 300 and the lower half compartment 200 is reduced more. Therefore, the opening of the dividing surface can be reduced by reducing the temperature difference generated in the passenger compartment 101. In addition, thermal stress that causes plastic deformation of the passenger compartment 101 can be reduced.

  Further, since the first flow path forming body 91 is provided in the first receiving groove 91a, the first flow path forming body 91 is not greatly projected from the inner surfaces of the upper half casing 300 and the lower half casing 200, One flow path forming body 91 is provided. In particular, as in the present embodiment, the surface of the first flow path forming body 91 that forms the discharge port 58 is disposed so as to be flush with the inner peripheral surface of the upper half vehicle interior 300, so that the vehicle interior 101 can be completely formed. It is possible to prevent the first flow path forming body 91 from protruding from the inner surface. As a result, the first flow path forming body 91 can be provided without hindering the flow state of the working fluid flowing through the discharge port 58. Further, when the size of the casing 101 itself is limited, the first flow path forming body 91 can be provided without changing the size of the discharge port 58.

  Further, the sealing device 6 is attached to the passenger compartment 101 in a state covered with the seal heat shield 94. Therefore, the heat of the sealing gas supplied to the sealing device 6 is transmitted to the upper half compartment 300 and the lower half compartment 200 via the seal heat shield 94. Here, the seal heat shield 94 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. As a result, heat is not easily transmitted to the upper half passenger compartment 300 and the lower half passenger compartment 200, and the temperatures of the upper half passenger compartment 300 and the lower half passenger compartment 200 are unlikely to decrease in the region where the sealing device 6 is installed. Become. Therefore, in the upper half casing 300 and the lower half casing 200 around the seal heat shield 94, the temperature drop due to the flow of the seal gas is alleviated. Thereby, the deformation | transformation of the upper half compartment 300 and the lower half compartment 200 around the division surface of the sealing device 6 vicinity is reduced, and it is suppressed that a division surface opens. Therefore, the opening of the dividing surface can be reduced by reducing the temperature difference generated in the passenger compartment 101. In addition, thermal stress that causes plastic deformation of the casing 101 around the dividing surface in the vicinity of the sealing device 6 can be reduced.

  Further, among the flow paths through which the process gas flows, the second flow path forming body in which the curved flow path 55 in which the normal process gas directly contacts the vehicle interior 101 extends from the upper half vehicle interior 300 to the lower half vehicle interior 200. 92. Thereby, the vicinity of the split surface of the upper half casing 300 and the lower half casing 200 of the curved flow path 55 is covered with the second flow path forming body 92. Therefore, the process gas flowing through the curved flow path 55 touches the second flow path forming body 92 without directly touching the vehicle interior 101 (the lower half vehicle compartment 200 and the upper half vehicle compartment 300). As a result, the heat of the process gas flowing through the curved flow path 55 is transmitted to the upper half casing 300 and the lower half casing 200 via the second flow path forming body 92. Here, the second flow path forming body 92 is formed so that the thermal conductivity is lower than that of the passenger compartment 101. Accordingly, heat is not easily transmitted to the upper half passenger compartment 300 and the lower half passenger compartment 200, and the temperatures of the upper half passenger compartment 300 and the lower half passenger compartment 200 in the vicinity of the dividing surface are hardly increased. Therefore, the temperature rise due to the process gas flowing in the upper half casing 300 and the lower half casing 200 around the second flow path forming body 92 is alleviated. In particular, in the plurality of bent flow paths 55, the temperature of the process gas that is exposed increases toward the final stage. However, the temperature rise due to the process gas flowing by the second flow path forming body 92 is effectively mitigated. Thereby, the deformation | transformation of the upper half compartment 300 and the lower half compartment 200 around the division surface of the curved flow path 55 vicinity is reduced, and it is suppressed that a division surface opens. Therefore, the opening of the dividing surface can be reduced by reducing the temperature difference generated in the passenger compartment 101. In addition, thermal stress that causes plastic deformation of the casing 101 around the dividing surface in the vicinity of the curved flow path 55 can be reduced.

  The bearing device 7 is attached to the passenger compartment 101 in a state where the bearing device 7 is covered with the bearing heat shield 95. Therefore, the heat of the lubricating oil used in the bearing device 7 is transmitted to the upper half casing 300 and the lower half casing 200 through the bearing heat shield 95. Here, the heat shield is formed so that the thermal conductivity is lower than that of the passenger compartment 101. As a result, heat is not easily transmitted to the upper half passenger compartment 300 and the lower half passenger compartment 200, and the temperature of the upper half passenger compartment 300 and the lower half passenger compartment 200 is unlikely to decrease in the region where the bearing device 7 is installed. Become. Therefore, the temperature drop due to the lubricating oil in the upper half casing 300 and the lower half casing 200 around the bearing heat shield 95 is alleviated. Thereby, the deformation | transformation of the upper half compartment 300 and the lower half compartment 200 around the division surface of the bearing apparatus 7 vicinity is reduced, and it is suppressed that a division surface opens. Therefore, the opening of the dividing surface can be reduced by reducing the temperature difference generated in the passenger compartment 101. In addition, thermal stress that causes plastic deformation of the casing 101 around the dividing surface in the vicinity of the bearing device 7 can be reduced.

(Other variations of the embodiment)
Although the embodiments of the present invention have been described in detail with reference to the drawings, the configurations and combinations of the embodiments in the embodiments are examples, and the addition and omission of configurations are within the scope not departing from the gist of the present invention. , Substitutions, and other changes are possible. Further, the present invention is not limited by the embodiments, and is limited only by the scope of the claims.

  In the present embodiment, the first flow path forming body 91, the second flow path forming body 92, the third flow path forming body 93, the seal heat shield 94, and the bearing heat shield 95 are all formed as separate members. However, it is not limited to such a form. For example, the first flow path forming body 91, the second flow path forming body 92, the third flow path forming body 93, the seal heat shield 94, and the bearing heat shield 95 are all integrally formed as one member. Also good. Further, only a part of the first flow path forming body 91, the second flow path forming body 92, the third flow path forming body 93, the seal heat shield 94, and the bearing heat shield 95 is integrated as one member. It may be formed. Therefore, for example, only the plurality of second flow path forming bodies 92 may be integrally formed as one member. Further, only the second flow path forming body 92 and the third flow path forming body 93 may be integrally formed as one member. Further, the bearing heat shield 95 and the seal heat shield 94 may be integrally formed as one member. By integrating a plurality of members in this way, the cost of design, processing, and assembly can be reduced as compared with the case where they are provided as separate members.

  Further, the first flow path forming body 91, the second flow path forming body 92, the third flow path forming body 93, the seal heat shield 94, and the bearing heat shield 95 of the present embodiment are the same metal material as the vehicle interior 101. However, the present invention is not limited to this. If the first flow path forming body 91, the second flow path forming body 92, the third flow path forming body 93, the seal heat shield 94, and the bearing heat shield 95 are lower in conductivity than the vehicle interior 101. , Each may be formed of a different structure or material. In addition, by making each into another material, a suitable material can be selected according to the temperature transmitted to the vehicle interior 101, and it can suppress cost as a whole.

In the present embodiment, the centrifugal compressor 1 is described as an example of the rotary machine, but the present invention is not limited to this. For example, the rotating machine may be a supercharger or a pump.

1 Centrifugal Compressor O Axis Da Axial direction Dr Radial direction Dv Vertical direction Dw Width direction 2 Rotor 3 Rotating shaft 4 Impeller 4a Cover 4b Blade 4c Disk 5 Diaphragm group 51 Diaphragm 52 Suction port 53 Suction channel 54 Diffuser channel 55 Curved flow Path 56 Return flow path 57 Discharge flow path 58 Discharge port 6 Sealing device 7 Bearing device 100 Cabin assembly 200 Lower half compartment 300 Upper half compartment 310 Upper half flange face 311 First upper half flange face 312 Second upper half Flange surface 350 Upper half accommodation recess 351 Upper half large diameter recess 352 Upper half small diameter recess 353 Upper half step surface 101 Car interior 402 Through hole 500 Seal housing 600 Seal member 91 First flow path forming body 91a First accommodation groove 92 Second flow Path forming body 92a Second housing groove 921 Main body 922 Flow path forming recess 93 Third flow path forming body 93a First Housing groove 94 seal heat shield 941 first heat blocking body 942 second thermal barrier body 94a fourth receiving groove 95 bearing heat shields 95a fifth receiving groove

Claims (6)

A vehicle compartment in which a housing space is formed by an upper half compartment and a lower half compartment;
A rotor having a rotating shaft rotatably accommodated in the accommodating space, and a plurality of impellers fixed to the outer periphery of the rotating shaft;
A plurality of diaphragms arranged in the housing space and covering the periphery of the rotor;
Forming at least part of a discharge port for discharging the working fluid discharged from the impeller at the final stage to the outside of the vehicle compartment, and extending from the upper half vehicle compartment to the lower half vehicle compartment inside the vehicle compartment A discharge port forming body,
The discharge port forming body is a rotating machine whose thermal conductivity is lower than that of the passenger compartment.   The rotating machine according to claim 1, wherein the discharge port forming body has an annular shape extending over the entire circumference in the circumferential direction of the rotating shaft. The casing is formed with a receiving groove that is recessed from the inner peripheral surface of the casing, corresponding to a region where the discharge port forming body is provided,
The rotating machine according to claim 1, wherein the discharge port forming body is provided in the housing groove. A seal portion that is provided between the rotating shaft and the vehicle compartment and seals the inside and outside of the vehicle compartment;
A seal heat shield that is provided between the seal portion and the passenger compartment and houses the seal portion;
The rotating machine according to any one of claims 1 to 3, wherein the seal heat shield has a lower thermal conductivity than the vehicle compartment. A curved flow path forming body that forms at least a part of a curved flow path that turns the flow direction of the working fluid from the direction toward the outside in the radial direction of the rotating shaft to the direction toward the inside;
The curved flow path forming body extends from the upper half passenger compartment to the lower half passenger compartment between the diaphragm and the passenger compartment, and has a lower thermal conductivity than the passenger compartment. The rotating machine according to any one of claims 1 to 4. A bearing portion provided between the rotating shaft and the vehicle compartment and rotatably supporting the rotating shaft;
A bearing heat shield that is provided between the bearing portion and the vehicle compartment and accommodates the bearing portion;
The rotary machine according to any one of claims 1 to 5, wherein the bearing heat shield has a lower thermal conductivity than the vehicle compartment.

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