JPH03183340A - Vibration isolator for vertical shaft rotating machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration isolator for a spindle rotating electrical machine, and particularly to a structure of a vibration isolator suitable for a large water turbine generator or the like.

[Conventional technology]

A conventional vibration isolator, as described in Japanese Patent Publication No. 52-42445, has a stay provided between the bearing brat and the foundation, and an adjustment bolt whose length is adjustable at the end of the stay. A metal spring was placed at the other end for support.

[Problem to be solved by the invention]

This is because the above conventional technology provides support by providing a stay between the upper bearing bracket and the foundation.

The number of attached parts such as metal fittings that hold the stay increases, which increases costs, and the adjustment bolt and spring are located far apart, so during adjustment work, there are two people: one who adjusts the bolt and one who measures the deflection of the spring. This had the disadvantage of requiring a large amount of installation work.

An object of the present invention is to extend the upper bearing bracket in the radial direction, omit the stay, and adjust the spring arranged between the bracket and the foundation with the adjustment bolt arranged between the spring and the bracket, thereby providing a vibration isolator. An object of the present invention is to provide a vibration isolating device for a vertical shaft rotary machine that makes adjustment extremely easy.

[Means to solve the problem]

In order to achieve the above purpose, an adjustment bolt is arranged at the tip of the upper bearing bracket extending in the radial direction, and the tip of the adjustment bolt is supported by making contact with a spring placed between the foundation and the bracket. .

[Function] That is, since the upper bearing bracket extends in the radial direction, there is no need for a stay, reducing installation man-hours, and
Since the adjustment bolt placed at the tip of the bracket directly supports the spring, the deflection of the spring can be observed when adjusting the bolt, making it easy for one worker to adjust the vibration isolator.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a vertical sectional view of a vertical shaft wooden wheel generator showing an embodiment of the present invention, in which the runner 21 is rotated by the hydraulic power introduced into the casing 22, and the generator rotor 23 directly connected to the water wheel is rotated by the hydraulic power introduced into the casing 22. It rotates accordingly. The rotor 23 is held by bearings 24 and 25, and the load applied to the bearings 25 is transmitted to the foundation 12 via the upper bearing bracket 2.

FIG. 1 shows a portion of FIG. 4 in detail.

The bracket 2 is fixed to the upper part of the stator, and an adjustment bolt 6 is screwed into a flange 4 at the tip of the bracket 2. The base 1 is attached to the foundation 12 facing the adjustment bolt 6.
0 is fixed. A spring 7 is arranged on the base 10,
The spring 7 is attached to the base 10 by a mounting bracket 8.

In such an arrangement, the length of the adjustment bolt 6 is adjusted by inserting a spanner into the parallel drawer 3 provided on the bolt 6 and rotating it, and then adjusting the length of the protrusion provided on the spring 7 with the adjustment bolt 6. By pressing, a preload is applied to the spring 7, and when the adjustment work of the bolt 6 is completed, the bolt 6 is locked by the nut 5 so that it does not loosen.

FIG. 2 is a plan view taken from the line ■-■ in FIG. It is supported by C part, but when preload is applied, spring 7
Deflection occurs and the gap G in the recess decreases, so the preload is managed by changing this gap G. For example, when applying a preload of 520 tons using a spring that causes a deflection of lll11 with a load of 100 tons. is the gap G
The adjustment bolt 6 applies a load to the spring 7 until the distance decreases by 0.2 m. This adjustment work is performed by the operator by inserting a spanner into the parallel part 13 provided on the adjustment bolt 6.
Since the deflection of the spring 7 is measured by the change in the gap G, adjustment work can be performed extremely easily by one operator.

In addition, in the conventional structure shown in FIGS. 6 and 7, the stay 4 had to be held by the holding fittings 3 and 9, and this installation work required a large amount of man-hours, but the present invention eliminates this. Since this is not necessary, the number of installation steps can be significantly reduced.

By the way, in the conventional structure shown in FIG. 6, by applying a preload using the stay 4 to the protrusion provided on the spring 7, the weight is applied evenly over the entire width B of the spring. In the invention, as shown in Fig. 1, a point in the center of the width B of the spring is pushed by the adjusting bolt 6, which may cause excessive stress on the spring 7, but according to experimental results, as shown in Fig. 3. As shown in , the thickness of the spring part T
and the total height H of the protrusion (H/T) a of about 1.5 or more,
That is, if H/T is set to about 1.15 or more, the stress S of the spring 7 becomes constant. That is, in the present invention, one point in the center of the spring 7 is pressed against the adjustment bolt 6, and the height of the protrusion of the spring 7 is appropriately selected so that H/T is 1.15.
If the above is done, the load will be equal to the case where the load is applied uniformly in the width direction of the spring 7 as in the conventional case.

In addition, FIG. 5 shows another embodiment of the present invention, in which a pivot 1.4 having a spherical tip is fixed to a recess 11 provided in a base 10, and the gap G between the spring 7 and the bottom surface can be measured more accurately. This has the same effect as in Fig. 3.

Moreover, it goes without saying that the same effect can be obtained even if the two aspects of the present invention are applied between the lower bracket 15 and the foundation 12.

〔Effect of the invention〕

As described above, according to the present invention, the upper bearing bracket is extended in the radial direction, thereby eliminating the need for a stay.

The installation work is extremely easy, and since the deflection of the spring can be measured while adjusting the adjustment bolt when adding preload to the spring, it can be done by one person, making it extremely easy to adjust the vibration isolator. There is an effect that can be done.

Furthermore, since a protrusion is provided at the center of the spring and the height of the protrusion is appropriately selected, excessive stress concentration will not occur in the spring.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing details of a part of FIG. 4. Figure 2 is a sectional view taken along the line nn in Figure 1, Figure 3 is a characteristic diagram showing the spring stress concentration when the height of the spring protrusion is changed, and Figure 4
The figure is a vertical sectional view of a vertical shaft wooden wheel generator showing one embodiment of the present invention, FIG. 5 is a partial plan view showing another embodiment of the present invention, and FIG.
7 are a side view and a partial plan view of a conventional vibration isolator. 2... Upper bearing bracket, 6... Adjustment bolt, 7
...Spring, 10...Base, b...Protrusion, 14
... Pivot leather 1 figure tail 2 - figure

Claims (1)

[Claims] 1. A metal plate spring mounted on the base is disposed between the upper or lower bearing bracket and the foundation of the vertical shaft rotating machine, and the spring is pushed by an adjustment bolt. The spring is adapted to apply a load, and is characterized in that a protrusion is provided at the center of the spring, and the tip of the adjustment bolt contacts one point in the widthwise center of the protrusion, thereby applying the load. Vibration isolation device for vertical shaft rotating machines. 2. Claim 1 characterized in that the ratio of the total height H of the projection part to the thickness T of the spring part is H/T of 1.15 or more.
Vibration isolation device for vertical shaft rotating machines as described in . 3. The vibration isolating device for a vertical shaft rotating machine according to claim 1, characterized in that the adjustment bolt is interposed between a bracket and a spring. 4. The vibration isolating device for a vertical shaft rotating machine as set forth in claim 1, wherein the tip of the adjustment bolt has a spherical surface, and the protrusion of the spring is supported by being pushed by the spherical surface. 5. Vertical shaft rotation according to claim 1, characterized in that a pivot having a spherical tip is disposed in a recess provided in the base, and the gap between the tip of the pivot and the bottom surface of the spring can be measured. Machine vibration isolator.