JPH0439451Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the shape of a guide vane for rectification that is applied to rectify flow in a flow path such as a pipe or a duct.

BACKGROUND ART FIG. 4 is a perspective view showing a conventional rectifying guide vane 01 in which both ends are welded to a channel wall 03 and an intermediate support member 05 at welded portions 02. Rectifying guide vane 0
The leading edge part 01a and the trailing edge part 01b of No. 1 had a shape in which the plate thickness was made thinner than the base material over the entire length including the welded parts 02 at both ends in order to minimize flow turbulence. In addition, FIG. 5 is an enlarged view of the V part in FIG. The plate thickness of the welded parts at both ends of the guide vane becomes thinner at the leading edge and the trailing edge. Therefore, when repetitive loads due to fluid force or thermal loads are applied to thin welded parts, stress concentration occurs locally, resulting in a significant decrease in fatigue strength.

Means for Solving the Problems The present invention solves the above-mentioned problems.The present invention solves the above-mentioned problems. In the rectifying guide vane having a shape that reduces turbulence, the plate thickness is the same in the vicinity of the end face from the leading edge to the trailing edge, and the leading edge and trailing edge of the part away from the end face are This is a rectifying guide vane characterized by having a thinner thickness over its entire length.

Effect: According to the above-mentioned means, the plate thickness at the end of the rectifying guide vane becomes uniform, and therefore the plate thickness at the welded part becomes uniform, so it is possible to improve weldability and welding strength, and to improve local It is possible to prevent a decrease in fatigue strength due to stress concentration.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a rectifying guide vane 1 of the present invention. ing. End surfaces 1c are provided at both ends of the rectifying guide vane 1 parallel to the flow direction. This rectifying guide vane 1 is fixed inside a flow path such as a pipe or duct and functions to straighten the fluid flowing in the flow path, but in order to suppress flow turbulence as much as possible, it has almost the entire length except for the vicinity of the end face 1c. The thickness of the board is reduced across the board. The rectifying guide vane 1 is fixed by welding the end face 1c on both sides to a support member such as a channel wall forming the channel or an intermediate support provided within the channel. The thickness of the end face 1c is uniform from the front edge 1a side to the rear edge 1b side, and the thickness of the base material can be used as is.

Further, FIG. 2 shows the above-mentioned rectifying guide vane 1 welded to the channel wall 3 at the welding part 2, and the rectifying guide vane 1 according to the present invention has an end face 1c with a uniform plate thickness. A welded portion 2 is formed over the entire circumference, and there is no welded portion 2 with a thin plate thickness as in the conventional example. Therefore, welding work becomes easier, and weldability and welding strength are also improved. And welded part 2
There are no areas where local stress concentration occurs,
There is no reduction in fatigue strength.

FIG. 3 shows another embodiment of the rectifying guide vane 1 according to the present invention, in which a rounded shape 4 is provided in advance in the vicinity of the welded part 2. In this case as well, welded part 2
The plate thickness is uniform over the entire circumference, and the welded portion can be made longer than in the above embodiment.

Effects of the Invention According to the above-mentioned present invention, there is no part where local stress concentration occurs in the welded part, and it is possible to prevent a decrease in fatigue strength in the welded part. Therefore, it becomes possible to provide a rectifying guide vane that is more reliable than before.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the rectifying guide vane according to the present invention, FIG. 2 is a perspective view showing the rectifying guide vane shown in FIG. 1 welded to the channel wall, and FIG.
The figure is a perspective view showing a state in which a rectifying guide vane according to another embodiment of the present invention is welded to a channel wall, FIG. FIG. 5 is a partially enlarged view of section V in FIG. 4. 1... Rectifying guide vane, 1a... Front edge portion, 1b...
...Rear edge, 1c... End face, 2... Welded part, 3...
Channel wall, 4...Round shape.

Claims (1)

[Scope of utility model registration request] In a flow straightening guide vane whose end face is welded in a flow path and whose leading edge and trailing edge are thinner to reduce flow turbulence, the vicinity of the end face is disposed from the leading edge. A rectifying guide vane characterized in that the plate thickness is the same up to the trailing edge, and the plate thickness of the leading edge and the trailing edge in a portion away from the end face is thinner over the entire length.