JPH084502A - Vibration control device for stationary vanes - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a vibration damping device for a stationary blade that does not adversely affect the performance of the compressor or turbine, has a small increase in weight, and has good workability during manufacturing and repair. Especially. [Structure] Each end surface of the stabbing portion of each vane has grooves cut at an angle with respect to the circumferential direction, and is stretched through these grooves to press each of the above vanes. Have a wire that is

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for stationary vanes such as compressors and turbines that handle gas.

[0002]

2. Description of the Related Art As a conventional damping structure for a stationary blade in a compressor or the like, there are known, for example, a double outer band and a resin molded inner band.

[0003]

However, in the case where the above-mentioned conventional outer band is doubled, there is a problem that the weight is increased due to the doubled outer band. In addition, when the inner band is molded, there is a problem that the inner band cannot be molded due to the structure of the vane (cantilevered by the outer band), and the molding requires a great deal of labor and experience by the operator. .

The present invention is intended to solve the above problems. That is, an object of the present invention is to provide a vibration damping device for a stationary blade that does not adversely affect the performance of the compressor or the turbine, has a small increase in weight, and has good workability during manufacture and repair. It is what

[0005]

In order to achieve the above object, the present invention has a groove formed on the end surface of the stubbing portion of each vane at an angle to the circumferential direction, and , A wire that is stretched through the grooves and presses the stationary vanes.

[0006]

According to the present invention, the end surfaces of the stabbing portions of each vane have grooves cut at an angle with respect to the circumferential direction, and the grooves are stretched through the grooves. Having a wire that presses each vane, i.e., the vane and the wire are reasonably pressed through the circumferentially angled grooves to ensure damping. Further, since the end portion of the wire is fixed to the outer band or the stubbing portion, the wire always tightens the groove, so that the wire is not loosened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway sectional front view showing an embodiment of the present invention. In FIG. 1, 1 is a vane, 2 is an outer band, 3 is a stabbing portion of the vane 1, 4 is an end surface of the stabbing portion 3, 5 is a groove provided in the end surface 4, and 6 is a wire described later. is there.

FIG. 2 is a developed plan view taken along the line AA of FIG. That is, the outer band 2 has a ring shape, but in FIG. 2, it is shown expanded in a plane shape. The groove 5 is provided on the end surface 4 at an angle θ (about 5 to 10 degrees) with respect to the circumferential direction,
A wire 6 is stretched through the groove 5 to press the stationary vanes 1, and both ends of the wire 6 are fixed to the outer peripheral surface of the outer band 2 or a part of the stubbing portion 3 by welding. There is.

In the vibration damping device for a stationary blade constructed as shown in FIGS. 1 and 2, the groove 5 formed on the end face 4 of the stubbing portion 3 of each stationary blade 1 at an angle θ with respect to the circumferential direction. By passing a wire 6 having a tension and having a tension in the groove 5, the stationary blade 1 and the wire 6 are appropriately pressed and damped. Since the wire 6 is fixed to the outer peripheral surface of the outer band 2 or the stubbing portion 3, the wire 6 binds the groove 5 from the outside, so that the wire 6 does not easily loosen. Moreover, since the groove provided on the end surface 4 of the stubbing portion 3 is closer to the end side than the center, the stationary blade 1
It is effective not only in the bending mode vibration control, but also in the torsion mode vibration control.

[0010]

According to the present invention, there is provided a wire which has grooves provided on the end surface of the stabbing portion of each vane, and which is stretched through the grooves to press the vanes. Since it has, it does not adversely affect the performance of the compressor or turbine, and vibration can be suppressed. Moreover, since the groove is cut at an angle to the circumferential direction, pressing by the tension of the wire is possible. It is always reliable, and since the end of the wire is fixed to the outer band or the stubbing part, it does not loosen.

As described above, according to the present invention, the increase in weight is minimal and the workability during manufacture and repair is good,
When it is removed, it is only necessary to cut the wire, and the effect is extremely large.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a developed plan view taken along the line AA of FIG.

[Explanation of symbols]

 1 stationary blade 2 outer band 3 stubbing part 4 end face 5 groove 6 wire

Claims (2)

[Claims] 1. An end face of a stabbing portion of each vane has grooves cut at an angle with respect to a circumferential direction, and the vanes are stretched through the grooves to form the vanes. A vibration damping device for a stationary blade, comprising a pressing wire. 2. The vibration damping device for a stationary blade according to claim 1, wherein the groove provided on the end face of the stabbing portion of each stationary blade is closer to the end side than the center.