JPS6091000A - Motorfan - Google Patents

Abstract

PURPOSE:To reduce noise by a method wherein the bearing of a motor shaft, to which an impeller is secured, is pinches by an air guide of split constitution arranged at the outer periphery of the impeller while the whole body including the motor is covered by a split casing. CONSTITUTION:The impeller is secured to the tip end of the motor shaft and constitutes the rotary body 22 of the fan together with a rotor 17. The casing of the motorfan is split into two of more parts and a stator 26 of the motor is held by the lower casing 24 while the bearing 18 is pinches by two sets of air guides 23. Next, the stator is covered by the upper casing 25 and, thereafter, the outer periphery of two casings 24, 25 are fixed by a clamping band 28 to constitute the motorfan. Balancing is regulated by cutting off the part of the rotor or the like after the rotating body 22 is assembled perfectly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric blower that can be used in vacuum cleaners, etc.Conventional structure and problems thereof Conventionally, this type of electric blower has been It has the configuration shown in the figure.

1 is a motor, 2 is a motor shaft, and an impeller 5 and a conical guide 6 are inserted into the motor shaft 2 from a receiving portion 3 via a spacer 4, and are fixed with screws 7. An air guide 8 is arranged around the outer periphery of the impeller 5, and the impeller 6 and the air guide 8 are covered with a casing 9.

Now, in the above configuration, the motor 1 is 20,000~
When rotating at a high speed of 30,000r and pom, if the impeller 5 is unbalanced, the vibrations due to the rotation will be transmitted to the motor shaft 2, resulting in loud noise υ, and rotational vibrations due to the unbalance on the motor side. If the noise is transmitted to the impeller 6, there is a disadvantage that the noise further increases.

Furthermore, a gap is absolutely necessary between the motor shaft 2 and the mounting hole of the impeller 5, and if the impeller 5 is fixed eccentrically during assembly, vibrations will occur.

Therefore, in order to offset the amount of unbalance between the impeller 5 and the motor 1, there was a problem in that it required time and effort during assembly, such as changing the position of several parts to suppress the amount of unbalance to a small value.

Next, the general configuration of conventional electric blowers has the disadvantage that the fan section including the impeller and the motor section are each independent, and combining them requires separate casings, which increases costs. It also had

OBJECTS OF THE INVENTION The present invention solves these conventional problems and provides a noise-reducing and inexpensive electric blower.

Structure of the Invention In the electric blower of the present invention, an impeller is constituted by a front shroud plate, a rear shroud plate, and a blade disposed between both shroud plates, and this impeller is fixed to a motor shaft and the bearing of the motor shaft is It is clamped by a split air guide arranged around the outer circumference of the impeller, and the impeller,
Air guide.

The entire motor section is made up of separate casings.

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

Fig. 2 shows a state in which the armature (hereinafter referred to as rotor) of the motor section and the impeller are integrated, 11 is a front shroud plate, 12 is a rear shroud plate, and this front, rear shroud plate 11, A blade 13 is disposed between the blades 12, and the above three parts are joined together by a canopy member 14 provided on the blade 13 to form an impeller 15.

Next, parts such as a rotor 17, a bearing 18 consisting of a bearing, and a commutator 19 are attached to the motor shaft 16. An impeller 15 and a conical kite 20 are fixed to the tip of the motor shaft 16 with screws 21, and together with the rotor 17 and the like constitute a rotating body 22 of the blower.

This balance adjustment of the rotating body 22 is performed by cutting a part of the conical guide 20 on the impeller side or the rotor 17.

3 and 4 show an air guide 23 arranged around the outer periphery of the impeller 5, and this air guide 23 is divided into two parts along the center. Note that the number of divisions may be two or more.

FIG. 5 shows the overall configuration of the electric blower, and the housing of the electric blower is divided into two or more parts.

24 is a lower case, and 26 is an upper case. The stator 26 of the motor section is held in the lower housing 24, and after the rotating body 22 is inserted therein, the stator 26 of the motor section is held.
The bearing 18 is clamped by two air guides 23. next,
After covering with the upper casing 25, the outer peripheries of the two casings 24 and 25 are fixed with a tightening band 28 to complete an electric blower. 27 is a brush portion, and 29 is an exhaust port.

The electric blower having the above configuration is used by being incorporated into a vacuum cleaner or the like, and is no different from conventional electric blowers. The air flow caused by the rotation of the motor is as indicated by the arrows in FIG.

Effects of the Invention When the impeller and motor are individually balanced as in the conventional example, eccentricity occurs during assembly. Alternatively, there is a limit to how much the unbalance can be reduced even if the position of several phrases is changed. However, as is clear from the examples, in the electric blower of the present invention, the balance is adjusted after all the rotating bodies of the electric blower are assembled, so the vibration caused by the rotation of the impeller can be extremely small, and the rotation noise ( N sound)
Or you can get a smaller and quieter device. Since the impeller part and the motor part can be constructed in one housing, the conventional motor case, bearing member, fan casing, etc. are no longer necessary, and an inexpensive electric blower can be obtained. Furthermore, since each component can be mounted on the divided housing, assembly can be performed from one side, which has excellent effects such as improved workability.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a cross-sectional view of an electric blower showing a conventional example, Fig. 2 is a cross-sectional view showing a state of connection between the motor section and the impeller of an electric blower showing an embodiment of the present invention; 3 is a top view of the air guide of the electric blower, FIG. 4 is a sectional view showing a part of the air guide, and FIG. 5 is a sectional view of the main part of the electric blower. 15... impeller, 17... armature,
18...Bearing, 16...Motor shaft, 23...
...Air guide, 24, 25...Housing. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 3 Figure 4

Claims (1)

[Claims] The front shroud plate, the rear shroud plate, and the blades arranged between both shroud plates constitute an impeller, and this impeller is fixed to the motor shaft, and the bearing of the motor shaft is arranged on the outer periphery of the impeller 2. An electric blower that is sandwiched between air guides and the impeller, air guide, and motor are all covered by a separate housing.