JP-7857265-B2 - Turbo compressor

Inventors

• 井出 聡
• 村上 翔太郎

Assignees

• 株式会社神戸製鋼所

Dates

Publication Date

20260512

Application Date

20231117

Claims (6)

1. It is a turbo compressor, A rotating member including an impeller, the rotating member having a through hole formed at the center of rotation, A rotating shaft for rotating the aforementioned rotating member, wherein the rotating shaft has a female threaded portion formed at its tip, A tension bolt having a longitudinal intermediate portion located within the through hole, a first male threaded portion protruding from one opening of the through hole being screwed with a nut outside the impeller, and a second male threaded portion protruding from the opening opposite to the first opening being screwed with the female threaded portion, Equipped with, The tension bolt has, in the intermediate portion, a main body and a radiating portion stacked on the outer circumference of the main body in at least a portion of the longitudinal direction of the intermediate portion, The radiating portion is positioned so as to face the portion of the rotating member surrounding the radiating portion in a non-contact state with a gap in between, and is made of a material with a higher emissivity than the main body portion. The dimension of the gap is 5% to 50% of the diameter of the tension bolt. Turbo compressor.
2. The turbo compressor according to claim 1, wherein the radiating portion is a coating layer formed on the outer periphery of the main body by ceramic thermal spraying.
3. The turbo compressor according to claim 2, wherein the coating layer comprises a ceramic coating containing at least one of aluminachromia and alumina-titania.
4. The rotating member comprises a rotating member body portion which is the main body of the rotating member, and other radiating portions laminated on at least a portion of the surface of the rotating member body portion facing the intermediate portion of the tension bolt, The turbo compressor according to claim 1, wherein the other radiating portion is made of a material with a higher emissivity than the rotating member body.
5. The radiating portion in the tension bolt is provided in a part of the longitudinal direction in the intermediate portion, The turbo compressor according to claim 1, wherein the tension bolt has a contact portion that contacts the rotating member in the portion of the intermediate part other than the portion where the radiating portion is provided.
6. The turbo compressor according to claim 5 , wherein the tension bolt has a separate radiating portion provided in the contact portion that contacts the rotating member, and is made of a material with a higher emissivity than the main body portion.

Description

This invention relates to a turbo compressor. Conventionally, turbo-type compressors are known. Patent Document 1 discloses a turbo compressor equipped with a tension bolt that clamps and supports the impeller against the rotating shaft at a predetermined pressure. The tension bolt is made of a high-strength steel rod with male threads formed at both ends. In clamping and supporting the impeller against the rotating shaft using a tension bolt, first, the tension bolt is passed through a through-hole in the impeller, and the male thread at one end is screwed onto a female thread provided at the tip of the rotating shaft. Next, with a predetermined tensile force applied to the tension bolt, a nut is screwed onto the other male thread protruding from the impeller. By clamping and supporting the impeller against the rotating shaft in this way using a tension bolt, the impeller is clamped between the rotating shaft and the nut by the reaction force (axial force) of the tensile force generated in the tension bolt. Patent No. 4876867 This is a cross-sectional view showing a part of the configuration of a turbo compressor according to the first embodiment of the present invention.This is a cross-sectional view showing the tension bolt and its surrounding components in the turbo compressor.This is a cutaway diagram showing the configuration of the intermediate portion of the tension bolt.This graph shows the simulation results regarding the temperature change of tension bolts.This graph shows the simulation results of the stress changes acting on a tension bolt.This is a cross-sectional view showing a part of the configuration of a turbo compressor according to a second embodiment of the present invention.This is a cross-sectional view showing a part of the configuration of a turbo compressor according to the third embodiment of the present invention.This is a cross-sectional view showing a part of the configuration of a turbo compressor according to the fourth embodiment of the present invention.This is a cross-sectional view showing a part of the configuration of a turbo compressor according to a fifth embodiment of the present invention. The embodiments of the present invention will be described below with reference to the drawings. The forms described below are illustrative examples of the present invention, and the present invention is not limited to these forms except for its essential configuration. [First Embodiment] 1. Structure of Turbo Compressor 1 The structure of the turbo compressor 1 according to the first embodiment of the present invention will be described with reference to Figure 1. Note that Figure 1 shows only a portion of the components of the turbo compressor 1. As shown in Figure 1, the turbo compressor 1 comprises a rotating member, a casing 11, and a casing cover 12. The turbo compressor 1 also comprises a gear case 13, a bull gear 16, and a pinion gear 15. The gear case 13 is a case member having a housing space 13a for housing the bull gear 16 and the pinion gear 15. The casing cover 12 is fastened to the gear case 13 by fastening members (not shown in the figure). The gear case 13 has a case hole 13b that connects the housing space 13a to the outside. The casing cover 12 is positioned so that the centerlines of the case hole 13b and the casing cover 12 coincide, and it has a cover hole 12a that penetrates in the thickness direction. The gear case 13 and the casing cover 12 are fastened together such that the case hole 13b of the gear case 13 and the cover hole 12a of the casing cover 12 communicate with each other. The casing cover 12 has the casing 11 attached to the side opposite to the side attached to the gear case 13. The casing 11 is also attached to the casing cover 12 using fastening members (not shown in the illustration). The space 1a formed by the casing cover 12 and the casing 11 houses the impeller 10. The rotating member is a member that rotates by a rotating shaft 15b, which will be described later, and in this embodiment, it is configured as an impeller 10. In the turbo compressor 1, during operation, kinetic energy is imparted to the gas by the rotation of the impeller 10 in the space 1a formed by the casing cover 12 and the casing 11. Then, in the portion of space 1a radially outside the impeller 10, the gas, which has been given kinetic energy by the rotation of the impeller 10, is decelerated and pressurized. During operation of the turbo compressor 1, temperature changes occur in the impeller 10, the casing 11, and the casing cover 12, which are affected by the compressed gas. The impeller 10, casing 11, and casing cover 12 expand and contract in response to these temperature changes. A motor or turbine (not shown) is connected to the pull gear 16 housed in the storage space 13a of the gear case 13. The pull gear 16 rotates by receiving rotational driving force from a rotational drive source such as a motor. The pinion gear 15 has a gear body 15a that meshes with the