JPS59208200A - Moving blade control type axial blower - Google Patents

Abstract

PURPOSE:To vary the flow rate of air by changing the angle of a moving blade in such a manual and simple manner that the pin integrally formed on a blade is dropped into one of the dents formed on a retaining plate and then turned to a proper position. CONSTITUTION:Many dents 12 for a pin 9 selectively dropped therein are circularly arranged on a retaining plate 11, which is tightened to an impeller hub 3 with small screws 13. A blade 7 is depressed in its central direction to compress a spring 10 so that the pin 9 integrally formed on the blade comes off the dent 12 on the retaining plate 11. Depressing the blade 7 is released after the blade 7 is turned to a position at which the pin 9 might fall in adequate one of the dents for the blade 7 directing at a demanded angle. The pin 9 then drops into the dent 12 by the restoring force of the spring 10 so that changing the angle of the blade may be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a variable rotor blade axial flow blower used in ventilation, air conditioning, blower equipment, etc.

Configuration of conventional examples and their problems Conventional axial flow blowers have semi-fixed rotor blades as shown in Figures 1 and 2, or have external drive blades as shown in Figures 3 and 4. There was only a variable rotor blade type in which the rotor blades were changed by a device.

In FIG. 1, 1 is a motor, 2 is a motor shaft, 103 is an impeller hub, and 4 is the motor shaft 2 and the impeller hub 1.
Bolt for fixing 03 together, 6 is washer, 6
107 is a key, and 107 is a blade fixed radially to the impeller hub 103 with a nut 8. Fig. 2 is a sectional view taken along line A-A in Fig. 1. To change the mounting angle of the blade 107, loosen the nut 8. To increase the air volume, move the nut 8 in the X direction, and to decrease the air volume, move the nut 8 in the Y direction. It is necessary to rotate the blade 107.

Figure 3 shows an example of an axial flow blower with variable rotor blades. In Figure 3, the same number as in Figure 1 indicates the same item or one that performs the same function. The outer blade 307 is a blade that is attached radially to the impeller hub 303 in the same way as shown in FIG. Through the blade mounting bolt 31
1 and is rotatably mounted. A roller 312 is rotatably attached to a part of this blade rotating fitting 308, and the other roller 312 is attached to a drive fitting 313 and a holding plate 31.
4 and is held between bolts 316. Further, this drive fitting 313 is supported by a bearing 317 mounted on the impeller hub cover 316, and has a structure capable of sliding in the direction a in the figure. Furthermore, the drive fitting 3
13 is connected to a rod 319 via a bearing 318, and the rod 319 is driven by a drive device (not shown).
It has a structure that allows it to slide during rotation when moving in the direction. Note that 320 is a bearing holder, and 321 is a ring that prevents the bearing from being removed.

FIG. 4 is a sectional view taken along line BB in FIG. 3.

With the above configuration, when the rod 319 moves in the direction a, force is transmitted through the bearing 318, drive fitting 313, and blade rotation fitting 308, and the blade 307 rotates, so even when the blower is operating, the mounting angle of the rotor blade can be adjusted freely. It can be changed.

However, there is no need to constantly control the air volume of ventilation, air conditioning, and blower equipment, and the air volume can be adjusted occasionally or regularly in response to seasonal load fluctuations, load fluctuations between weekdays and holidays, and load fluctuations due to increases and decreases in equipment. However, once the air volume has been changed, it is often the case that the air volume is operated at the same amount for a certain period of time. In such a case, a semi-fixed axial flow blower as shown in FIG. 1 has the disadvantage that it is necessary to enter the air path and loosen the nut 8 to change the mounting angle of the blade 107.

In addition, in the case of an axial flow blower with variable rotor blades as shown in Figure 3,
Since a rotor blade variable mechanism, a drive device (not shown) for driving the rod 319, a control device for controlling them, and the like are required, the device is complicated and expensive.

OBJECTS OF THE INVENTION The present invention solves the drawbacks of the conventional technology, and aims to provide a blower that allows the rotor blades to be easily and manually changed to change the air volume as required.

Structure of the Invention In order to achieve the above object, the present invention comprises blades radially attached to an impeller hub fixed to the shaft of an electric motor, a nut for fixing the blades to the impeller hub, and an impeller hub. A spring placed between the blades, a presser plate that presses the blade, and a bottle integrated with the blade and a presser plate that press down and rotate the blade toward the center. The installation angle of the blade can be changed by fitting the holes together.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 6 and 7.

In FIGS. 6 to 7, parts with the same numbers as those in FIG. 1 indicate the same parts or parts having the same functions, and their explanations will be omitted. We will then mainly explain the different parts. 3 is an impeller hub, 7 is a blade, 9 is a bottle integrated with the blade 7, 10 is a spring inserted between the impeller hub 3 and the blade 7, and 11 is a hole 12 on the outer periphery into which the bottle 9 is fitted. Holding plate with many holes, 13 is holding plate 1
1 is a countersunk screw fixed to the impeller hub 3, and 14 is a washer inserted between the impeller hub 3 and the nut 8. FIG. 6 is a sectional view taken along the line CC in FIG. 6, and FIG. 7 is a perspective view showing details of the blade door.

In the above configuration, the blade 7 is held down toward the center so as to compress the spring 10, and the bottle 9 is held down by the holding plate 11.
Remove the bottle 9 from the hole 12 drilled in the hole 12, rotate the blade 7 so that it enters the appropriate hole 12 corresponding to the required blade angle, remove the pressing force, and the restoring force of the spring 10 will force the bottle 9 into the hole 12. It is possible to change the cutting blade angle.

Therefore, it is possible to manually change the mounting angle of the rotor blades as necessary without using any tools or the like.

Effects of the Invention As is clear from the above explanation, an impeller hub fixed to the shaft of an electric motor, blades attached radially to the impeller hub, and a NAND fixing the blades to the impeller hub, It consists of a spring placed between the impeller hub and the blade, and a presser plate that presses the blade. The installation angle of the blade can be changed by fitting the holes.
The installation angle of the rotor blades can be easily changed and the air volume can be changed manually as needed without using any tools, and the effect is great.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional axial blower with semi-fixed rotor blades, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is an example of a conventional axial blower with variable rotor blades. Cross-sectional view, Figure 4 is B in Figure 3
-B sectional view, FIG. 6 is a sectional view of a main part showing an embodiment of the present invention, FIG. 6 is a sectional view showing a C-C cross section of FIG. 6, and FIG. 7 is a perspective view of a main part of FIG. 6. It is a diagram. 1...Electric motor, 3...Impeller...B,
7...Blade, 8...Natsuto, 10
······spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4

Claims (1)

[Claims] An impeller hub fixed to the shaft of an electric motor, blades radially attached to the impeller hub, and a nut fixing the blades to the impeller hub.
a spring placed between the impeller hub and the blade; a holding plate that holds the blade against the spring and has a plurality of holes on the outer periphery; and the holding plate engages with the hole of the holding plate by the force of the spring; and a pin provided on the blade, and by pushing down and rotating the blade toward the center, the blade pin and the hole in the valve plate fit together to change the installation angle of the blade.