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

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.

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 first connection part and the second connection part from an outer side in the radial direction and extends along a circumferential direction of the rotating machine,
• a second arcuate member that has a second fitting groove that is fitted to the first connection part and the second connection part from the outer side in the radial direction and extends along the circumferential direction of the rotating machine,
• a rotation part configured to rotatably link one end portion of the first arcuate member and one end portion of the second arcuate member, and
• a fastening part that fastens the other end portion of the first arcuate member and the other end portion of the second arcuate member,
• wherein in a case where, regarding an angle position around an axis line of the rotating machine, a rotation center of the rotation part is set to 0° and an angle position α is defined such that an angle gradually increases toward the fastening part via the second arcuate member from the rotation part,
• the rough surface region includes a rotation-part-side rough surface region formed within an first angle range satisfying a condition of −60°≤α≤60°,
• wherein the non-rough surface region is configured not to be present in the first angle range, 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.

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 first connection part and the second connection part from an outer side in the radial direction and extends along a circumferential direction of the rotating machine,
• a second arcuate member that has a second fitting groove that is fitted to the first connection part and the second connection part from the outer side in the radial direction and extends along the circumferential direction of the rotating machine,
• a rotation part configured to rotatably link one end portion of the first arcuate member and one end portion of the second arcuate member, and
• a fastening part that fastens the other end portion of the first arcuate member and the other end portion of the second arcuate member,
• wherein in a case where, regarding an angle position around an axis line of the rotating machine, a rotation center of the rotation part is set to 0° and an angle position α is defined such that an angle gradually increases toward the fastening part via the second arcuate member from the rotation part,
• the rough surface region includes a fastening-part-side rough surface region formed within an second angle range satisfying a condition of 120°≤α≤240°,
• wherein the non-rough surface region is configured not to be present in the second angle range, 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.