JPH0717994U - Single suction type suction casing of compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent flow disturbance due to struts that connect an inner casing and an outer casing in a single-suction inlet air inlet casing such as a compressor for a gas turbine. [Structure] The struts (7a), (7b), ─, (7f) are provided in a vertical direction, instead of the radial arrangement as in the past. The air flowing into the intake casing (1) from above smoothly flows along the surfaces of all the struts (7a), (7b), ─, (7f), and there is no separation unlike the conventional case, so the total pressure The loss is significantly reduced, and there is no variation between struts, improving the performance of the compressor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a strut structure of a one-suction type intake casing part of a compressor for a gas turbine or the like.

[0002]

[Prior art]

 FIG. 4 is a vertical sectional side view showing an example of a single suction type intake casing of a conventional gas turbine compressor, and FIG. 5 is a transverse sectional view of the same. In these figures, (1) is an intake casing with a single suction structure, (2) is an outer casing, (3) is an inner casing, (4a), (4b), (4c), (4d), (4e). ) And (4f) are struts radially provided around the rotation axis to connect and support the outer casing (2) and the inner casing, (5) is a compressor inlet guide vane, and (6) is a compressor flow. The respective paths are shown.

The air sucked from the intake casing (1) of such a compressor is changed by the compressor outer casing (2) and inner casing (3) from a rectangular cross section to an annular cross section. Flowing in a flow path that changes its direction, it flows into the compressor flow path (6) between the struts (4) and between the compressor inlet guide vanes (5).

[0004]

[Problems to be solved by the device]

 Since the intake casing of the conventional compressor has a single-suction structure, among the plurality of struts arranged radially, the vertical struts (4a), (4d) except the lateral struts (4b), For (4c), (4e), and (4f), the flow that flows down from above and branches left and right by the compressor inner casing (3) becomes belly and back. Then, as a matter of course, the flow separated from the strut surface, resulting in a large decrease in total pressure, and also in the compressor performance.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned conventional problems, the present invention is directed to a single-suction intake casing of a compressor, in which a plurality of struts that connect and support the outer casing and the inner casing of the compressor are all directed vertically. The present invention proposes a single-suction type intake casing for a compressor, which is characterized in that

[0006]

[Action]

 Since the present invention is configured as described above, there is no strut that causes the air at the inlet of the compressor to be struck or back-struck, and the air flows smoothly along the surface of all struts. Therefore, the flow does not separate from the surface of the strut, and no vortex flow is generated, so that the total pressure loss is significantly reduced, and there is no variation between struts, and the performance of the compressor is improved.

[0007]

【Example】

 1 is a vertical side view showing an embodiment of the present invention, and FIG. 2 is a transverse sectional view of the same. In these figures, the same parts as those of the conventional one described in FIG. 4 and FIG. 5 are given the same reference numerals to avoid redundancy, and detailed description thereof is omitted.

In this embodiment, struts (7a), (7b), (7c), (7d), (7e), which connect and support the outer casing (2) and the inner casing (3) at the compressor inlet. (7f) is provided not vertically but in the vertical direction. Therefore, there are no struts that cause the bellows and backlash of air at the compressor inlet, and the air flows smoothly along the surface of all struts. As a result, the flow does not separate and becomes uniform along the circumference, significantly reducing total pressure loss.

FIG. 3 is a diagram illustrating the result of a test comparing the pressure loss of each strut in the conventional strut arrangement and the strut arrangement of the present invention. According to this, in the conventional strut arrangement, the pressure loss of each strut shows a variation with the value shown in the right half of the figure, whereas in the strut arrangement of the present invention, the pressure loss of each strut is as shown in the figure. As can be seen from the left half, the value is extremely small and there is almost no variation.

[0010]

[Effect of device]

 According to the present invention, the air at the inlet of the compressor flows smoothly along the surfaces of all the struts, so that the flow does not separate from the surfaces of the struts. Therefore, the total pressure loss is significantly reduced, and there is no variation between struts, which improves the compressor performance.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a diagram illustrating the result of a test comparing the pressure loss of each strut in the present invention with the conventional case.

FIG. 4 is a vertical cross-sectional side view showing an example of a single suction type intake casing of a conventional gas turbine compressor.

5 is a cross-sectional view of FIG.

[Explanation of symbols]

 (1) Air intake casing (2) Outer casing (3) Inner casing (4a), (4b), (4c), (4d), (4e), (4f) Strut (5) Compressor inlet guide vane (6) Compressor channel (7a), (7b), (7c), (7d), (7e), (7f) strut

Claims (1)

[Scope of utility model registration request] 1. A single-suction type intake casing of a compressor, wherein a plurality of struts for connecting and supporting an outer casing and an inner casing of a compressor inlet are all provided in a vertical direction. Single suction type intake casing.