JPS62107296A - Correcting method for imbalance in impeller - Google Patents

Abstract

PURPOSE:To easily perform correcting work of imbalance, by inserting a calker nut into a hole, drilled in one part of a main plate, from a side opposite to a side plate and fixing the nut thereafter tightening a weight, supplied to the main plate from the side opposite to the side plate, to an internal threaded part of side nut through an external thread. CONSTITUTION:A blank of calker nut 11 is inserted placing its flange 11c to the outer into a hole 10, drilled in one part of a main plate 1, from a side opposite to a side plate. And the nut, utilizing its internal threaded part 11a, is given rotating torque by a calking tool and fixed to the main plate 1 giving plastic deformation to a small thickness cylindrical part 11b in the blank by calk forming. Thus the flange 11c of the calker nut 11 is brought into close contact with and secured to the main plate 1. Thereafter, a weight 13 of required weight, being supplied onto the flange 11c of the calker nut 11 brought into close contact with the main plate 1 from the side opposite to the side plate, is tightened and fixed to the internal threaded part 11a of the calker nut 11 through an external thread of a bolt 14, and mounting work of the weight for correcting imbalance is completed. In this way, correcting work can be easily performed only from one direction.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a method for correcting misalignment of an impeller, and in particular,
For example, the present invention relates to an impeller unbalance correction method suitable for performing a balance test using a vertical balance tester and performing unbalance correction work.

[Background of the invention]

The method of correcting the imbalance in the conventional balance test is [
As described in "Motion Balance Test" by Kazuhiko Akashi et al., Corona Publishing (first edition 1960), 224-26, there are two main methods: adding a weight and removing a weight, each with different product and work details. Various methods are adopted depending on the situation.

For example, in a balance test of a multi-blade impeller, the method of removing the weight is not efficient when the thickness of the base material plate becomes thin, so a method of adding a weight is generally used.

When attaching weights to multi-blade impellers, welding is more likely to cause deformation due to heat effects as the base metal plate becomes thinner.
There is a concern that performing welding work near or on the test machine may affect the detection part.

The soldering method is unreliable for relatively heavy objects that rotate at high speed.

In addition, the rivet fastening method and screw fastening method have high bonding strength and high reliability, and are often adopted4, but in the vertical testing machine as described on pages 74-75 of the above-mentioned document, , to supply weights and fastening parts.
Once the workpiece has been removed from the testing machine and the unbalance has been corrected, the test must be performed again.

Furthermore, in a multi-blade impeller, a plate part that serves as a weight is wrapped around a large number of arranged blades.

A sandwiching method is also used, but as the impeller becomes relatively large, the amount of unbalance tends to increase, so it is necessary to control the weight each time and manufacture many types of complicated sandwiching weights. did not become.

Therefore, an unbalance correction method that has been widely adopted in the past as an example of adding a relatively heavy weight to a multi-blade impeller will be explained with reference to FIGS. 5 to 7.

Here, Fig. 5 is a cross-sectional view of a general multi-blade impeller, Fig. 6 is a cross-sectional view showing a method for attaching weights using conventional rivet fastening, and Fig. 7 is a cross-sectional view showing a method for attaching weights using conventional screw fastening. FIG. 3 is a cross-sectional view showing the method.

'In Figure 5, 1 is the main plate and 2 is a large number of blades.

3 is a side plate, 4 is a hub fastened to the main plate 1, and these constitute a general multi-blade impeller 5.

When attaching a relatively heavy weight to such a multi-blade impeller 5, as shown in FIG. It is common to fix the center in the direction of 0-O.

The most commonly used methods for attaching weights are:
As mentioned above, the rivet fastening method (Fig. 6) and screw fastening method (
Figure 7).

The method of attaching the weight by fastening with rivets as shown in Fig. 6 is as follows.
As shown in FIG. 6(a), the weight 6 is supplied to the main plate 1 in the direction of arrow A, the rivet 7 is supplied in the direction of arrow B, and as shown in FIG. The forming step 7' is carried out in the direction of arrow A.

In addition, the method for attaching the weight by screw fastening as shown in Fig. 7 is as shown in Fig. 7(a).
The supply of bolts 8 and 8 is in the direction of arrow A, as shown in Fig. 7 (b).
), the nut 9 is tightened in the direction of arrow B.

In this way, in both the riveting and screw fastening methods, it is necessary to supply parts to the main plate 1 from both sides and work from both sides.
The work must be done by inserting your hand in the direction of arrow B from the inner diameter of the side plate 3.

Therefore, if a weight for unbalance correction cannot be added by welding or gluing, and mechanical fixing is attempted, work must be done from both sides of the main plate 1, and in particular, the shaft of the multi-blade impeller 5 must be fixed. When performing a balance test using a vertical balance tester that conducts tests with the center 0-0 in the vertical direction and correcting unbalance, it is necessary to temporarily remove the multi-blade impeller on the tester and turn it around. 9. There was a problem of poor workability.

[Purpose of the invention]

The present invention was made in order to solve the problems of the prior art described above, and it is possible to add weights from one direction to correct unbalance when testing a two-impeller balance. The purpose of this invention is to provide a method for correcting unbalance of an impeller.

[Summary of the invention]

The method for correcting unbalance of an impeller according to the present invention is a method for correcting unbalance of an impeller consisting of a main plate, 9 blades on a side plate, and a hub, in which a hole is made in a part of the main plate, and 9 blades are inserted into the hole on the opposite side plate. After inserting and fixing the caulking nut, a weight of a required weight is supplied to the main plate from the opposite side of the plate, and the weight is fastened to the female threaded portion of the caulking nut via the male screw.

As an additional note, in the present invention, when performing an impeller balance test, if the work of adding a weight to the main plate of the impeller to correct the imbalance can be performed only from one direction,
It was developed with the focus on the fact that corrections can be made while the impeller is mounted on the balance tester without having to reverse it.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

First, FIG. 1 is a diagram showing the procedure of a method for correcting unbalance of a multi-blade impeller according to an embodiment of the present invention, and (a) to (b)
is a sectional view showing the crimping nut fixing process, (d) is a perspective sectional view showing the crimping nut fixing state, and (θ) is a sectional view showing the weight attachment state.

The target product for the unbalance test of this example is the multi-blade impeller 5 shown in FIG. 5, and FIG. 1 shows only the main plate 2 of the multi-blade impeller 5.

First, as shown in FIG.
Open. This work is performed in the direction of arrow A from the opposite side of the main plate 1 shown in FIG. 5 (the left side of the main plate 1 in FIG. 5).

Next, as shown in FIG. 1(b), the hole 1 of the main plate 1 is
0, and from the opposite side plate in the direction of arrow A, tighten the swage nut 1.
Insert the material in step 1 with the flange llc outside. Then, a rotational torque is applied using the caulking tool 12 using the female thread portion 11a to plastically deform the thin cylindrical portion 11b of the material, thereby caulking and fixing it to the main plate 1. The fixed state of part 1 is shown in FIG. 1(d), in which the flange llc of the caulking nut is tightly fixed to the main plate 1.

This caulking nut 11 is a commercially available product that can be easily obtained, and can be fixed at a required location with a simple operation.

Thereafter, as shown in FIG. 1(e), a weight 13 of a required weight is supplied from the opposite plate side onto the flange llc of the caulking nut 11 that is in close contact with the main plate 1, and the weight 13 is
3 into the female threaded part 11a of the caulking nut 11, and then insert the bolt 1
After tightening and fixing via the male screw No. 4, the work of installing the weight for unbalance correction is completed.

In this way, the series of operations described above can be performed from only one direction.

In addition, the method of attaching weights using caulking nuts is particularly effective for large multi-blade impellers with a thin plate structure, and the weight of the weight can be easily adjusted by changing the plate thickness and diameter. The cost will increase even for models that do not require special weights and are produced in small quantities.Next, Figures 2 to 4 show the balance test of multi-blade impellers using a vertical balance tester.
This will be explained with reference to the figures.

Figures 2 and 3 are explanatory diagrams showing a state in which a multi-blade impeller is mounted on a vertical balance test machine, and Figure 4 is an illustration of a vertical balance test machine equipped with a multi-blade impeller. Figure 2 shows the multi-blade impeller 5 supported by the fulcrum 15a of the vertical balance tester main body 15 with the main plate 1 at the bottom and the side plate 3 at the top.

In this case, due to the difference in the dimensions of the multi-blade impeller.

For example, in order to test a large multi-blade impeller 5' as shown by the dashed-dotted line, the working surface will be elevated, and a weight will be attached to the main plate l from the inner diameter side of the side plate 3. This means poor workability.

On the other hand, Figure 3 shows the main plate 1 of the multi-blade blade 5 above.

A state in which the hub 4 is supported by the fulcrum 15a of the vertical balance tester main body 15 is shown with the side plate 3 facing down.

In this way, even if the dimensions of the multi-blade impeller are different, for example, when testing a large-sized multi-blade impeller 5' as shown by the dashed line, the surface height of the main plate 1 will not change, as shown in Figure 1. If the method of attaching the weight using the caulking nut explained in 2 is adopted, there is no need to work inside the side plate 3.

FIG. 4 shows an embodiment in which the unbalance correction method shown in FIG. 1 is applied to a vertical balance tester.

As shown in the 4th FM, the multi-blade impeller 5 is mounted on the vertical balance test machine main body 15, a balance test is carried out, and the amount and position of unbalance is detected by gravity.

The information is displayed on the display panel 16.

Then, use a special drill unit 17 to drill a hole at the position of the main plate corresponding to the angle indicating the unbalanced position, and first drill the first hole.
Attach the weights as explained in the figure and correct the imbalance.

The drill unit 17 is mounted on an arm 18 so as to be slidable in the horizontal direction, and the arm 18 is slidable on the support post 19 in the vertical direction, and is capable of performing drilling work during installation. It is possible to change the product being tested.

According to this embodiment, it is possible to work with many types of multi-blade impellers with relatively large diameters (see the dashed line in Fig. 4) without changing the working height much, and after measuring the unbalance, Workability is good, as it is possible to correct unbalances directly on the testing machine without removing the product under test, and confirmation can be performed immediately by re-measuring.

In addition, in the above-mentioned example, a multi-blade impeller was explained as a target product for balance testing and unbalance correction.
The present invention is not necessarily limited to multi-blade impellers, but can be applied to hanging impellers in which the same effects can be expected by attaching objects to the main plate.

In addition, in the above embodiment, an example was explained in which a balance test and an unbalance test were performed using a vertical balance tester.
Needless to say, the present invention is not limited to this, and can be applied to other balance testers.

Furthermore, in the embodiment shown in FIG.
Although the example in which the weight 13 is fastened with the bolt 14 has been described, the present invention is not limited to this.

For example, the weight itself may be provided with a male thread and fastened to the female thread of a caulking nut.

(Effects of the Invention) As described above, according to the present invention, an impeller with good workability can be used to add a weight from one direction to correct unbalance during an impeller balance test. An unbalance correction method can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the procedure of a method for correcting unbalance of a multi-blade impeller according to an embodiment of the present invention, (a) to (Q) are cross-sectional views showing the process of fixing a caulking nut, and (d) (e) is a perspective sectional view showing the state in which the caulking nut is fixed, and (e) is a sectional view showing the state in which the weight is attached. Figures 2 and 3 are explanatory diagrams showing a multi-blade impeller mounted on a vertical balance test machine, and Figure 4 is a front view of the vertical balance test machine equipped with a multi-blade impeller. , Fig. 5 is a cross-sectional view of a general multi-blade impeller, Fig. 6 is a cross-sectional view showing the conventional method of attaching weights by fastening with rivets, and Fig. 7 is a cross-sectional view of a conventional multi-blade impeller.
FIG. 3 is a sectional view showing a conventional method for attaching weights by screw fastening. 1...Main plate, 2...Blade, 3...Side plate, 4...
hub. 5.5'...Multi-blade impeller, 10...Hole, 11...
Caulking nut, lla... Female thread part, 12... Tool for caulking, 13... Weight, 14... Bolt, 15
...Vertical contact tester body, 17...Drill unit i~.

Claims (1)

[Claims] 1. A method for correcting unbalance in an impeller consisting of a main plate, side plates, blades, and a hub. After drilling a hole in a part of the main plate and inserting a caulking nut into the hole from the opposite side plate, fixing the impeller. A method for correcting unbalance of an impeller, characterized in that a weight of a required weight is supplied to the main plate from the opposite side of the plate, and the weight is fastened to the female threaded portion of the caulking nut via a male thread.