JP-7856141-B2 - compressor

Inventors

• 田中 隆太
• 赤松 陽介
• 大内田 聡
• 中島 雅祐
• 吉永 誠一郎

Assignees

• 株式会社IHI

Dates

Publication Date

20260511

Application Date

20230302

Priority Date

20220316

Claims (7)

1. A compressor that further compresses a fluid compressed by a first impeller using a second impeller, An impeller housing having a first housing for housing the first impeller and a second housing for housing the second impeller, The system includes an interstage component connected to the impeller housing, which together with the impeller housing forms an interstage passage for introducing the fluid from the first impeller to the second impeller, The interstage channel has at least one curved channel, The curved channel includes an inner circumferential wall surface that curves on the inner side in a cross-section passing through the center line of the curved channel, and an outer circumferential wall surface that curves on the outer side in the cross-section. One of the inner circumferential side wall surface and the outer circumferential side wall surface is formed in the impeller housing, The other of the inner circumferential side wall surface and the outer circumferential side wall surface is formed in the interstage component, In the cross-section, the boundary line indicating the boundary between the impeller housing and the interstage component extends between the inner and outer side walls so as to intersect both the straight line connecting the starting end of the inner side wall and the starting end of the outer side wall, and the straight line connecting the end of the inner side wall and the end of the outer side wall . In the cross-section, the boundary line indicating the boundary between the impeller housing and the interstage component has a first boundary line and a second boundary line between the inner circumferential side wall surface and the outer circumferential side wall surface. The first boundary line extends so as to intersect the straight line connecting the starting end of the inner circumferential side wall surface and the starting end of the outer circumferential side wall surface. A compressor wherein the second boundary line extends so as to intersect a straight line connecting the end of the inner circumferential side wall and the end of the outer circumferential side wall, and is directly or indirectly connected to the first boundary line between the inner circumferential side wall and the outer circumferential side wall .
2. The compressor according to claim 1, wherein the distance between the inner circumferential side wall surface and the outer circumferential side wall surface in a direction perpendicular to the center line is constant at each position along the center line.
3. The compressor according to claim 1, wherein, in a cross-section perpendicular to the centerline of the curved flow path, the inner circumferential side wall extends in a straight line, and the outer circumferential side wall curves so as to bulge outward from the inner circumferential side wall on the opposite side.
4. The interstage component is an interstage housing connected in series to the first housing via the second housing, The inner circumferential side wall surface is formed in the second housing, The compressor according to claim 1, wherein the outer peripheral wall surface is formed on the interstage component.
5. The interstage component is an interstage plate sandwiched between the first housing and the second housing, The inner circumferential side wall surface is formed in the interstage component, The compressor according to claim 1, wherein the outer peripheral wall surface is formed in the first housing.
6. The interstage channel further comprises a straight channel extending linearly from the curved channel, The straight channel includes a first wall surface connected to the inner circumferential wall surface and a second wall surface connected to the outer circumferential wall surface. The compressor according to claim 1, wherein the first wall surface and the second wall surface extend parallel to each other in the cross-section passing through the center line and are formed in the impeller housing.
7. A compressor that further compresses a fluid compressed by a first impeller using a second impeller, An impeller housing having a first housing for housing the first impeller and a second housing for housing the second impeller, The system includes an interstage component connected to the impeller housing, which together with the impeller housing forms an interstage passage for introducing the fluid from the first impeller to the second impeller, The interstage channel has at least one curved channel, The curved channel includes an inner circumferential wall surface that curves on the inner side in a cross-section passing through the center line of the curved channel, and an outer circumferential wall surface that curves on the outer side in the cross-section. One of the inner circumferential side wall surface and the outer circumferential side wall surface is formed in the impeller housing, The other of the inner circumferential side wall surface and the outer circumferential side wall surface is formed in the interstage component, In the cross-section, the boundary line indicating the boundary between the impeller housing and the interstage component extends between the inner and outer side walls so as to intersect both the straight line connecting the starting end of the inner side wall and the starting end of the outer side wall, and the straight line connecting the end of the inner side wall and the end of the outer side wall. A compressor in which, in a cross-section perpendicular to the center line of the curved flow path, the inner circumferential wall surface extends in a straight line, and the outer circumferential wall surface curves so as to bulge outwards from the inner circumferential wall surface on the opposite side.

Description

This disclosure relates to a compressor. Patent documents 1 to 3 disclose technology relating to compressors. Among such compressors, multi-stage compressors having two or more compression stages are known. A multi-stage compressor includes, for example, a first-stage compression stage that draws in and compresses fluid, and a second-stage compression stage that further compresses the fluid compressed by the first-stage compression stage. In such a multi-stage compressor, the first-stage and second-stage compression stages are generally connected by piping, and fluid from the first-stage compression stage is introduced to the second-stage compression stage through a flow path in the piping. International Publication No. 2021/038737Japanese Patent Publication No. 2012-202331Japanese Patent Publication No. 2021-085512 Figure 1 is a cross-sectional view showing a compressor according to one embodiment.Figure 2 is an enlarged cross-sectional view of the compression unit of the compressor shown in Figure 1.Figure 3 is an enlarged cross-sectional view of a portion of the interstage flow path of the compression unit shown in Figure 1.Figure 4(a) is a cross-sectional view of the interstage channel along the line A1-A1 in Figure 3. Figure 4(b) is a cross-sectional view of the interstage channel along the line A2-A2 in Figure 3.Figure 5 is a cross-sectional view of the compression unit, showing the individual components of the compression unit as shown in Figure 2.Figure 6 is an enlarged cross-sectional view of a compression unit according to a comparative example.Figure 7(a) is an enlarged cross-sectional view of a part of the compression unit according to Reference Example 1. Figure 7(b) is an enlarged cross-sectional view of a part of the compression unit according to Reference Example 2.Figure 8(a) is an enlarged cross-sectional view of a part of the compression unit according to Reference Example 3. Figure 8(b) is an enlarged cross-sectional view of a part of the compression unit according to Reference Example 4.Figure 9 is an enlarged cross-sectional view of a part of the compression unit according to Modification 1.Figure 10 is an enlarged cross-sectional view of a part of the compression unit according to the modified example 2. A compressor according to one embodiment of the present disclosure further compresses a fluid compressed by a first impeller with a second impeller. The compressor comprises an impeller housing having a first housing for housing a first impeller and a second housing for housing a second impeller, and an interstage component connected to the impeller housing and, together with the impeller housing, forming an interstage passage for introducing fluid from the first impeller to the second impeller. The interstage passage has at least one curved passage. The curved passage includes an inner circumferential wall surface that curves on the inner side in a cross-section passing through the centerline of the curved passage, and an outer circumferential wall surface that curves on the outer side in a cross-section. One of the inner circumferential wall surface and the outer circumferential wall surface is formed in the impeller housing. The other of the inner circumferential wall surface and the outer circumferential wall surface is formed in the interstage component. In the compressor described above, the interstage passage that introduces fluid from the first impeller to the second impeller is formed by the impeller housing and the interstage component. One of the inner and outer side walls of the curved passage of the interstage passage is formed in the impeller housing, while the other is formed in the interstage component. In other words, the inner and outer side walls of the curved passage are formed in separate housings. In this case, unlike when the inner and outer side walls are formed in a single housing, the formation of overhangs in each component can be avoided, making it possible to mold each component. This makes it possible to mold each component using die casting, which has a low manufacturing cost. Furthermore, in the above configuration, the process of separately preparing piping for the interstage passage and assembling it to the impeller housing can be eliminated, thus reducing assembly man-hours. Therefore, the above compressor makes it possible to improve productivity and suppress mass production costs. In some embodiments, the boundary line indicating the boundary between the impeller housing and the interstage component in the above cross-section may have a first boundary line and a second boundary line between the inner circumferential side wall surface and the outer circumferential side wall surface. The first boundary line may extend so as to intersect a straight line connecting the starting end of the inner circumferential side wall surface and the starting end of the outer circumferential side wall surface. The second boundary line may extend so as to intersect a