Casing for rotating machine, rotating machine, and method for producing casing for rotating machine

Patent metadata

Field	Value
Publication number	US-12553365-B2
Application number	US-202218287387-A
Country	US
Kind code	B2
Filing date	Jun 21, 2022
Priority date	Jun 24, 2021
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

A casing that is for a rotating machine and that is configured such that a plurality of housings are linked together, the casing comprising: a first housing including a first connection part that protrudes outward in a radial direction of the rotating machine and that has a first surface extending along the radial direction; a second housing including a second connection part that protrude outward in the radial direction and that has a second surface extending along the radial direction and being in contact with the first surface; and at least one fastening device that fastens the first connection part and the second connection part in the axial direction of the rotating machine, wherein at least one of the first surface or the second surface includes, at least at a portion thereof, a rough surface region having formed therein a plurality of laser irradiation marks formed by irradiation with laser light.

First claim

The invention claimed is:

1 . A casing for a rotating machine configured such that a plurality of housings are linked to each other, the casing for the rotating machine comprising:
a first housing that includes a first connection part having a first surface extending along a radial direction of the rotating machine; a second housing that includes a second connection part having a second surface extending along the radial direction and being in contact with the first surface, and at least one fastening device that fastens the first connection part and the second connection part in an axial direction of the rotating machine, wherein at least one of the first surface or the second surface includes a rough surface region in which a plurality of laser irradiation marks formed by irradiation with laser light are formed and a non-rough surface region in which the laser irradiation marks are not formed, wherein the first connection part has a recessed portion into which an outer peripheral edge portion of the second connection part is fittable, the at least one fastening device includes a support plate that includes an inner peripheral portion that sandwiches the outer peripheral edge portion of the second connection part between the inner peripheral portion and the recessed portion of the first connection part and an outer peripheral portion that protrudes on an outer side of the second connection part in the radial direction of the rotating machine, and a fastening bolt that fastens the outer peripheral portion of the support plate to the first connection part, wherein in a case where a conical trapezoidal space is defined whose diameter increases, from a head part fastening surface of the fastening bolt toward a fastening strength acting direction of the fastening bolt, by an inclination angle θ with respect to the fastening strength acting direction, the rough surface region is configured to be present in the conical trapezoidal space that satisfies a condition in which the inclination angle θ is 0° or more and 30° or less, and the non-rough surface region is configured not to be present in the conical trapezoidal space and wherein the casing is configured such that when the first surface and the second surface are brought into close contact by a fastening force generated by the fastening device, a frictional resistance against positional deviation is generated in the rough surface region, and a continuous contact surface is formed between the first surface and the second surface in the non-rough surface region.

2 . The casing for a rotating machine according to claim 1 ,
wherein the rough surface region includes a first rough surface region formed on one surface of the first surface or the second surface, and a second rough surface region provided at a position separated from the first rough surface region on the one surface in a circumferential direction of the rotating machine.

3 . The casing for a rotating machine according to claim 1 ,
wherein the at least one fastening device includes a fastening bolt including a shaft part that is inserted into a through-hole formed in the second connection part and screwed into the first connection part, and a head part configured to hold the second connection part between the head part and the first connection part.

4 . The casing for a rotating machine according to claim 1 ,
wherein the second housing is formed of a material harder than a material of the first housing, and the rough surface region is formed on the second surface of the second housing.

5 . The casing for a rotating machine according to claim 1 ,
wherein the plurality of laser irradiation marks are formed by the laser light emitted from a laser marker device having a laser light output of 100 W or less.

6 . A rotating machine comprising:
the casing according to claim 1 ; and an impeller that is rotatably accommodated in the casing.

7 . A method for producing a casing for a rotating machine configured such that a plurality of housings are linked to each other, the plurality of housings including
a first housing that includes a first connection part having a first surface extending along a radial direction of the rotating machine, and a second housing that includes a second connection part having a second surface extending along the radial direction and being in contact with the first surface, the method for producing the casing for a rotating machine comprising, a rough surface region forming step of irradiating at least one of the first surface or the second surface with laser light to form a rough surface region including a plurality of laser irradiation marks, and a non-rough surface region forming step of forming the non-rough surface region in which the laser irradiation marks are not formed, wherein the first connection part has a recessed portion into which an outer peripheral edge portion of the second connection part is fittable, the at least one fastening device includes a support plate that includes an inner peripheral portion that sandwiches the outer peripheral edge portion of the second connection part between the inner peripheral portion and the recessed portion of the first connection part and an outer peripheral portion that protrudes on an outer side of the second connection part in the radial direction of the rotating machine, and a fastening bolt that fastens the outer peripheral portion of the support plate to the first connection part, wherein in a case where a conical trapezoidal space is defined whose diameter increases, from a head part fastening surface of the fastening bolt toward a fastening strength acting direction of the fastening bolt, by an inclination angle θ with respect to the fastening strength acting direction, the rough surface region is configured to be present in the conical trapezoidal space that satisfies a condition in which the inclination angle θ is 0° or more and 30° or less, and the non-rough surface regions is configured not to be present in the conical trapezoidal space, and wherein the casing is configured such that when the first surface and the second surface are brought into close contact by a fastening force generated by the fastening device, a frictional resistance against positional deviation is generated in the rough surface region, and a continuous contact surface is formed between the first surface and the second surface in the non-rough surface region.

8 . The method for producing a casing for a rotating machine according to claim 7 ,
wherein in the rough surface region forming step, the rough surface region is formed by the laser light emitted from a laser marker device having a laser light output of 100 W or less.

9 . A casing for a rotating machine configured such that a plurality of housings are linked to each other, the casing for a rotating machine comprising:
a first housing that includes a first connection part having a first surface extending along a radial direction of the rotating machine; a second housing that includes a second connection part having a second surface extending along the radial direction and being in contact with the first surface; and at least one fastening device that fastens the first connection part and the second connection part in an axial direction of the rotating machine, wherein at least one of the first surface or the second surface includes a rough surface region in which a plurality of laser irradiation marks formed by irradiation with laser light are formed and a non-rough surface region in which the laser irradiation marks are not formed, wherein the at least one fastening device includes a first arcuate member that has a first fitting groove that is fitted to the fi

Assignees

• Mitsubishi Heavy Ind Engine & Turbocharger Ltd

Inventors

• Akiyama Youji
• Seike Nariaki
• Ehana Takuya

Classifications

• F05D2260/31

  Retaining bolts or nuts · CPC title

• F05D2250/60

  Structure; Surface texture · CPC title

• F05D2230/13

  using lasers · CPC title

• F05D2220/40

  in turbochargers · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title