JP2000352397A - Vane for motor fan and balance correction means thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vane for a motor fan which enables adapting of an advanced correction level by balance correction at any portion in the axial direction without deteriorating workability in the balance correction. SOLUTION: A vane 1 for motor fan and balance correction means thereof comprise small holes or preferably U grooves opening on the inner peripheral face side provided on a rotor hub on the inner peripheral surface side whose depth varies at least in part. Alternatively, a recessed portion 4-5 is provided with inclination in the circumferential or axial direction. Furthermore, a weight for balance correction is structured to insert and fix into any part of the recessed portion 4-5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller for a motor fan, and more particularly to an impeller for facilitating advanced balance correction and a method for correcting the balance.

[0002]

2. Description of the Related Art FIGS. 11 and 12 are cross-sectional views and a front view of a main part of an example of a motor fan according to the prior art, in which the balance correction of a rotating body including an impeller is usually performed for the purpose of suppressing vibration and quieting. Will be applied. As shown in the figure, the balance correcting means forms a small hole 4 at the opening end 3-1 of the rotor hub 3 as appropriate, and embeds a weight (not shown, the same applies hereinafter) into the hole. Although omitted, a weight is added and fixed to the blade 2,
Instead of using the weight together, various means such as a method of cutting off the meat of the rotor hub 3 are widely known.

[0003] These balance corrections can be performed in a single plane in the axial direction on one side of the rotor hub 3 as shown in the figure in many cases. As is known as two-sided correction, for example, a method in which balance correction at the open end 3-1 of the rotor hub 3 and balance correction using the bottom 3-2 of the rotor hub 3 are also used. ing.

[0004]

In the above-described conventional configuration, since the balance is corrected at a fixed position on one or two surfaces in the axial direction, advanced corrections such as forced repetition of the correction work are required. In addition, it is difficult to cope with the level, and in the case of the two-sided correction, the reverse correction work is disadvantageous in terms of workability.

[0005]

SUMMARY OF THE INVENTION An impeller for a motor fan and a method for correcting the balance according to the present invention include:
Preferably, it is drilled in the same direction, at least a part of which has a depth close to the entire length of the rotor hub, and comprises a small hole or an open U-groove on the inner peripheral surface side of the rotor hub, or Perforated radially within the thickness of the hub or circumferentially long within the thickness of the rotor hub and inclined in the circumferential direction so that their respective circumferential ends overlap each other It is configured to have a recess formed.

[0006] Further, the balance correcting operation includes a step of measuring imbalance, a step of selecting and extracting a weight for balance correction corresponding to the measurement result, and inserting the selected weight into a predetermined recess. And a step of fixing and holding the inserted and inserted weights at predetermined axially deviated portions in concave portions having different depths.

[0007]

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

FIGS. 1 and 2 are a schematic sectional view and a front view of a first example of an axial fan according to the present invention, in which a plurality of balance correcting weights are attached to a rotor hub 3 from an open end 3-1. Small hole-shaped recesses 4-1 and 4-2 for fitting and inserting are provided by drilling. The small hole-shaped recesses 4-1 and 4-2 are attached to the rotor hub 3
Although the arrangement in the circumferential direction is the same as that of the above-described prior art, it is characterized in that its axial depth is not unitary, and as shown in FIG. It is a preferred embodiment to have a depth reaching the vicinity of the bottom surface of the slave hub.

As shown in the drawing, a small hole-shaped concave portion is formed which is concentric in two rows of a shallow one and a deep one from the opening end 3-1 to the bottom 3-2.

As shown in FIGS. 3 and 4, small-hole-shaped recesses 4-1 and 4-2 are formed from the lower portion 3-2 of the rotor hub 3 toward the open end 3-1. May be.

Each of the above-described recesses is a small hole formed in the thickness of the cylindrical portion of the rotor hub. As a third example of the present invention, as shown in FIGS. May be a U-shaped groove-shaped recess 4-3 which is opened on the inner peripheral surface side of the rotor hub 3. The reason why the U-shaped concave portion 4-3 is opened to the inner peripheral surface side is as follows.
The weight to be fitted and inserted is to prevent the weight fixed and inserted from being dissipated and separated by the centrifugal force acting on the rotor hub 3 which is the rotating part due to the operation of the motor fan. It is essential to secure the fixing means in the form of formation, but it is also possible to form a U-shaped groove or other concave portion which is open on the outer peripheral surface side of the rotor hub 3.

FIGS. 7 and 8 show a fourth embodiment of the present invention.
This example is adopted when the cylindrical portion forming the rotor hub 3 can have a thick structure.
4 is formed so as to have a gradient from the opening end toward the bottom side toward the axis center. The mass of the weight for balance correction is selected in accordance with the required correction amount, and its effect is related to the distance from the axis. Therefore, the inclination of the concave portion 4-4 causes the weight of the weight to move in the axial direction. It is intended to change the fixing distance from the shaft center depending on the insertion fixing part of the. In the illustrated example, the gradient is from the opening end toward the axis, but the gradient may be outward.

Further, as in a fifth example shown in FIG. 9, within the thickness of the cylindrical portion of the rotor hub 3, the front shape of the small hole-shaped concave portion has a long side in the circumferential direction. You may incline so that the distance from an axial center may change. As in the fourth example described above, it is intended to change the fixing distance from the axis depending on the fixing position of the weight. The adjacent sector-shaped concave portions 4-5 having long sides in the circumferential direction can be corrected in balance in two radial directions if their circumferential ends overlap each other in the radial direction.

Using the rotor hub 3 having the plurality of recesses having different depths, the unbalance is measured, and the weight having the mass corresponding to the measurement result and the fixing position are detected. By inserting a predetermined weight into the recessed hole, it is possible to perform optimal balance correction not only in the circumferential direction and the radial direction but also in any part in the axial direction.

[0015]

The configuration / means for correcting the balance according to the present invention is more than the conventional one-sided or two-sided correction, and enables more advanced balance correction by selecting and setting an arbitrary correction point in the axial direction. As a result, it is possible to further improve the level of quietness and vibration suppression.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a main part of an example of a motor fan according to the present invention.

FIG. 2 is a front view of the example of FIG. 1;

FIG. 3 is a schematic cross-sectional view of a main part of a second example of the motor fan according to the present invention.

FIG. 4 is a front view of the example of FIG. 3;

FIG. 5 is a schematic sectional view of a main part of a third example of the motor fan according to the present invention.

FIG. 6 is a front view of the example of FIG. 5;

FIG. 7 is a schematic cross-sectional view of a main part of a fourth example of the motor fan according to the present invention.

FIG. 8 is a front view of the example of FIG. 7;

FIG. 9 is a schematic cross-sectional view of a main part of a fifth example of the motor fan according to the present invention.

FIG. 10 is a front view of the example of FIG. 9;

FIG. 11 is a schematic sectional view of a main part of an example of a motor fan according to the prior art.

FIG. 12 is a front view of the example of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impeller 2 Blade 3 Rotor hub 3-1 Open end 3-2 Bottom 4 Small hole for balance correction 4-1, 4-1 'Shallow recess 4-2, 4-2' Deep recess 4-3 Inner circumference U-groove open on the surface side 4-4 Recessed portion having gradient in radial direction 4-5 Recessed portion inclined in circumferential direction 5 Rotor

Claims (9)

[Claims] 1. A motor fan impeller in which a plurality of blades are implanted on an outer peripheral surface of a rotor hub, wherein a plurality of recesses extending in an axial direction and having different depths are formed in the rotor hub. An impeller for a motor fan. 2. A recess formed in the rotor hub is formed from an open end to a bottom, and at least a part of the recess has a depth close to the bottom of the rotor hub.
The impeller for a motor fan according to claim 1, wherein: 3. A recess formed in the rotor hub is formed from a bottom side toward an open end, and at least a part thereof has a depth close to an open end of the rotor hub. The impeller for a motor fan according to claim 1, characterized in that: 4. The rotor hub according to claim 1, wherein the recesses formed in the rotor hub are formed concentrically in two rows of a shallow one and a deep one. The impeller for a motor fan according to the above. 5. The motor fan impeller according to claim 1, wherein the plurality of recesses having different depths formed in the rotor hub are small holes. 6. A motor fan impeller having a plurality of blades planted on an outer peripheral surface of a rotor hub, wherein the rotor hub has a plurality of U-shaped grooves extending in an axial direction and opened on an inner peripheral surface side. An impeller for a motor fan, wherein a recess is formed. 7. A motor fan impeller having a plurality of blades implanted on an outer peripheral surface of a rotor hub, wherein the rotor hub has an axially extending radial gradient within a thickness of the rotor hub. A recess formed by a plurality of small holes having: 8. A motor fan impeller in which a plurality of blades are implanted on an outer peripheral surface of a rotor hub, wherein the rotor hub is circumferentially long within the thickness of the rotor hub and has a circumferential shape. A concave portion is formed so as to be inclined in a direction so that its circumferential end portions overlap each other in the radial direction. 9. A method for correcting the balance of an impeller for a motor fan, wherein a plurality of blades are implanted on an outer peripheral surface of a rotor hub and a plurality of recesses extending in an axial direction are formed in the rotor hub. In the step of measuring the unbalance, the step of selecting and extracting the weight for balance correction corresponding to the measurement result, the step of fitting and inserting the selected weight into a predetermined recess, And fixing the weights at predetermined positions in the concave portions having different depths which are deviated in the axial direction, respectively.