JPH02131724A - Motor-driven air blower for vacuum cleaner - Google Patents

Abstract

PURPOSE:To support a motor by repulsion of magnetic force, and also, to prevent the compression of support rubber, so that the vibration in the thrust, radial and rotational directions of the motor is not transferred to the body by attaching a permanent magnet to a bracket and casing of the centroid part of the motor and a pair of ribs formed in the bracket, respectively, and attaching a magnet of the same pole to a position of the body opposed to the respective magnets. CONSTITUTION:As for the vibration in the thrust direction of a motor 30, the motor 30 is supported by non-contact by repulsion of a magnet B 22 attached to a casing 20 and a magnet B' 24 attached to a body 25, it does not occur that the motor 30 is drawn to a dust collecting chamber 33 side and it does not occur that the front of support rubber 29 is compressed. Also, as for the vibration in the radial direction of the motor 30, since a magnet 21 is attached in the vicinity of the centroid of the motor 30, and in the body 25 opposed thereto, the motor 30 is held by non-contact by repulsion to a magnet 23 of the same pole, the radial vibration is not transferred to the body 25.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an electric blower for a vacuum cleaner used at home.

Prior Art Conventionally, this type of electric blower is known, for example, from Japanese Patent Application Laid-Open No. 641-876.
The configuration was as described in Publication No. 4. Further, to explain the details with reference to Figures 3 and 4, 1 is a shaft that forms a υ outer shell with a load side bracket (metal) 2 and an anti-load side bracket (metal) 3, and rotates toward the load side bracket 2. 4 protruded, and a rotating fan 6 was fixed thereto with nanometers 6. An air guide 7 is attached to the outer circumference and below the fan 6, a casing 8 covers the front of the fan 6, and an intake port 8a is opened in the center of the casing 8, facing the intake port 6a of the fan 6. ing.

The load side placket 2 has an opening 2a, and the anti-load side placket 3 has an exhaust port 3a.

That is, a motor 1 whose outer shell is constituted by a load side placket 2 and a counter-load side placket 3 is provided with a filter 6, an air guide 7. It is a combination of Kernung 8. The air sucked in from the intake port 8a by the rotation of the fan 6 cools the inside of the motor 1, and then is discharged from the exhaust port 3a. Motor 1
Support rubber made of soft material such as rubber 9.
It is held at 10.

Problems to be Solved by the Invention However, when operating a vacuum cleaner with such a structure, the vacuum pressure in the dust collection chamber of the main body increases due to the suction force of the motor (
Approximately 16ooIIIH2o), the vacuum pressure pulls the motor forward (toward the dust collection chamber), compressing the support rubber, and as a result, the rubber itself loses its elasticity, causing motor vibration. The noise was transmitted directly to the vacuum cleaner itself, creating vibrational noise that increased the noise level of the vacuum cleaner itself.

In particular, in recent years, the suction power of vacuum cleaners has become higher, and as quieter vacuum cleaners are desired, the above problem has become very serious.

Means for Solving the Problems In order to solve these conventional problems, the present invention provides a fan in which the stator, the rotor, and the rotor rotate twice,
A bearing on the load side of the rotor, which is provided below the fan.
The air guide holds the bearing on the anti-load side of the rotor, and the anti-load side bracket holds the bearing on the anti-load side of the rotor. A magnet is attached to the top surface, and a magnet of the same polarity is provided on the vacuum cleaner body facing the same, a rib is provided on the anti-placket perpendicular to the rotor, magnets are attached above and below the rib, and the magnet is provided opposite to the magnet. The main body is equipped with magnets of the same polarity.

Function: With the above-mentioned means, the center of gravity of the motor floats due to the repulsive force of the magnet, and since a magnet is also attached to the upper surface of the casing, the thrust direction of the motor is also held by the repulsive force of the magnet. Therefore, the motor is held in a non-contact manner with respect to the main body of the vacuum cleaner, and vibrations in the radial and thrust directions of the heptata are not transmitted to the main body, thereby reducing vibration noise.

Furthermore, since the ribs formed on the anti-load side placket are also held by the repulsive force of the magnets, motor vibrations occurring in the rotational direction of the fan can also be absorbed by the magnetic force.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In Figures 1 and 2, 11 is a rotor, and shaft 1
A pairing 13 is press-fitted onto both sides of the bearing 2, and one side of the bearing 13 is held by a placket 14 on the opposite load side. An exhaust port 14a is opened below the counter-load side placket 14. Further, the anti-load side placket 14 holds the outer periphery of the stator 15 at its center.

On the load side, the pairing 13 of the rotor 11 is held by an air guide 17. A shaft 12 projects through an air guide 17 on the load side of the rotor 11, and a fan 18 is fixed thereto with a nut 19.
Rotates with 1. Casing 2o above the fan 18
is covered, and an intake port 20& is opened in the center thereof opposite to the intake port 18a of the fan 18.

Furthermore, a permanent magnet A2 is attached to the side surface of the counter-load side plaque note 14.
1 is attached, and a magnet B22 is attached to the upper surface of the casing 2o. Magnets A' 2 3 and B'24 having the same polarity as the permanent magnets A21 and B22 are connected to the vacuum cleaner main body 25.
It is set in. Further, a pair of ribs 26 are formed diagonally on the outer periphery of the anti-load side placket 14, and permanent magnets C27 are attached to the upper and lower sides of the ribs 26, and are opposed to the magnets C27. Magnet C72 with the same polarity
8 is similarly provided on the main body 25.

29 is the support rubber front that supports the front part of the motor 3o,
The rear part is supported by a support rubber back 31. 32
is a partition wall that partitions the dust collection chamber 33 and the motor chamber 34, and the partition wall 3
2 has an intake port 36 that communicates the dust collecting figure 33 and the motor chamber 34.
It is.

Next, the operation of the above configuration will be explained. When the motor 27 is operated, the fan 18 and the rotor 11 move at high speed (
32000 rpm), air is sucked in by the rotation of the fan 18, and the inside of the dust collection chamber 33 becomes high vacuum pressure. The air sucked into the rotor 1 in the motor 30
1 and the stator 15, it is discharged through the exhaust port 14a.

At this time, the fan 18 which is a rotating body. Due to the residual unbalance of the rotor 11, vibration occurs in the pairing 13, and the vibration is transmitted to the air guide 17 forming the housing and the anti-load side placket 14, and the vibration is transmitted to the support rubber 29, which supports the motor 3o. 31 as well. However, at this time, the vibration in the thrust direction of the motor 30 is suppressed by the repulsive force of the magnet B22 attached to the casing 20 and the magnet B'24 attached to the main body 26, as the motor 3o is supported without contact. Since the support rubber front 29 is no longer stretched toward the 33 side, the support rubber front 29 is no longer compressed. Therefore, the vibration of the motor 30 is not transmitted to the main body 26, so that vibration noise can be reduced. In addition, in response to vibrations in the radial direction of the motor 30, a magnet 21 is attached near the center of gravity of the motor 30, and the motor 3o is moved in a non-contact manner by the repulsive force of a magnet 23 of the same polarity on the main body 26 facing the magnet 21. Since it is held, radial vibrations are not transmitted to the main body 26. Furthermore, the magnet 27 attached to the rib 26 formed on the placket 14 and the main body 25 facing the magnet 27 also respond to the vibration K in the rotational direction of the motor 30.
Vibration is absorbed by the repulsive force with the magnet 28 of the same polarity provided at the motor 30, and rotation of the motor 30 can also be prevented when starting up.

In this way, according to the present invention, the vibration of the motor 3o is reduced to the main body 2.
6, the noise from the vacuum cleaner can be reduced, allowing for quiet and comfortable cleaning.

Effects of the Invention The present invention is achieved by attaching permanent magnets to a pair of ribs formed on the placket, casing, and placket at the center of gravity of the motor, and attaching magnets of the same polarity to positions on the main body opposite to the respective magnets. The repulsive force of the magnetic force of this magnet supports the motor and prevents compression of the support rubber, thereby reducing the thrust of the motor. Since vibrations in the radial and rotational directions can be prevented from being transmitted to the main body, the vacuum cleaner can achieve low noise and provide comfortable cleaning.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention, Fig. 2 is a front view as seen from the motor casing, Fig. 3 is a partial sectional view of a conventional motor, and Fig. 4 is a conventional motor with a main body. FIG. 3 is a cross-sectional view of the assembled state. 11... Rotor, 13... Bear link, 14... Anti-load side placket, 18... Fan, 21... Magnet A122... Magnet A
', 23. ．． ．． ... Magnet B124 ... Magnet B
', 27... Magnet C128... Magnet C
' Name of agent Patent attorney Shigetaka Awano and 1 other person Figure +1--・D1ter f3---A゜Arin7 +4-, Soyoi 1 shell 117" Raka, To 18-11 fan 211 HakujA 22-...-'o'A stone taste 1

Claims (1)

[Claims] It consists of a stator, a rotor, a fan that rotates together with the rotor, an air guide provided below the fan and holding a bearing on the load side of the rotor, an anti-load side bracket that holds a bearing on the anti-load side of the rotor, and the fan The upper part is covered with a casing, and a magnet is attached to the anti-load side placket at the center of gravity of the motor and the top surface of the casing, and a magnet of the same polarity is provided on the vacuum cleaner body facing the same, and a magnet is attached to the anti-load side placket of the motor. An electric blower for a vacuum cleaner in which a rotor is provided with a vertical rib, magnets are attached above and below the rib, and magnets with the same polarity are provided in the main body to face the rib.