JPH0318242A - electric blower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electric blower for a vacuum cleaner.

2. Description of the Related Art Conventionally, this type of electric blower has a structure as illustrated in FIG. 3, for example. 1 forms an outer shell from an air guide (made of resin) 2 and a counter-load side bracket (made of resin) 3, and a shaft 4 that rotates toward the air guide 2 protrudes, to which a rotating fan 6 is fixed with a nut 5. , in front of fan 6,
This is a motor fan U covered with a casing 7, and an intake port 7a is opened in the center of the casing 7, facing the intake port 61L of the fan 6. Anti-load side bracket 3.
, 1, and 3 have an exhaust port 3a open therein.

! In addition, a rotor 8 and a stator 9 are built into the motor 1, and the rotor 8 is wound with a winding 8a, and the stator 9 is wound with a winding a91L. Ota,
Below the rotor 8, a commutator 10 connected to the winding 8a is fixed to the shaft 4 and comes into contact with a carbon brush 12 in a brush holder 11 fixed below the anti-load side bracket 3. It is designed to be able to slide.

One-1! ), the current supplied from the external power source reaches the carbon brush 12 from the stator winding 9a, and the commutator 10
to the winding EIL of the rotor 8. Therefore, the current flowing through the winding 8a of the rotor 8 and the magnetic flux generated by the stator 9 are interlinked, so a rotational torque is generated in the winding 8lL of the rotor 8 according to Fleming's left hand rule, and as a result, the rotor 8 Rotate.

When the rotor 8 rotates at high speed, the fan 6 fixed to the rotor 8 rotates at high speed and sucks air, which is converted from dynamic pressure to static pressure by the air guide 2 to cool the rotor 8 and stator 9. After that, it is discharged through the exhaust port 31L formed in the anti-load side bracket 3. The motor fan U1 is held by the main body 14 by surrounding the outer periphery of the casing 7 with a support rubber 13 made of a flexible material.The motor fan U1 is surrounded by a soundproof plate made of urethane or the like. It was covered with 16.

Problems to be Solved by the Invention However, in the motor fan U having such a structure, when rotating at high speed due to the residual imbalance between the rotor and the fan, vibration is transmitted to the bearing through the shaft, and vibration is generated to the air guide and the anti-load side bracket. is transmitted and even transmitted to the casing. At this time, the support rubber for holding the motor fan U is pulled forward by the suction force of the motor fan U and is compressed, resulting in a decrease in vibration absorption. Since the vibration noise is transmitted to the motor fan U, the vibration noise becomes high pitched, and the vibration noise is carried by the exhaust gas and is directly discharged from the motor fan U, which is extremely unpleasant to the ears.

6., 7 The present invention solves the above-mentioned problems of the conventional art.It securely fixes the motor case cap and casing, improves quality, and reduces the vibration of the motor fan by making it difficult to transmit it to the main body. This is intended to reduce noise.

Means for Solving the Problems In order to solve the above problems, the present invention provides a stator, a rotor, a fan that rotates together with the rotor, an air guide that is provided below the fan and holds a load-side bearing of the rotor, and a rotor. It consists of an anti-load side bracket that holds a load side bearing, the upper part of the fan is covered with a casing, and the casing has a substantially cylindrical motor case cap that protrudes beyond the casing in the center. , the motor case cap is made of resin and is press-fitted into the casing, and the outer diameter of the upper part of the motor case cap is reduced to $-! ). t
In addition, a large number of bosses are provided, inserted into holes formed in the casing, and welded together.A step is created on the outer periphery of the motor case cap and the bosses are melted at the same time as shown in page 6. A support rubber made of flexible material is installed to hold the vacuum cleaner body.

Effect When the motor fan is constructed using the above-mentioned means, the motor fan is held by the outer periphery of the motor case cap provided in the center of the casing, so the motor fan can be held in the area where thrust vibration is small, so vibrations are not transmitted to the main body. This makes it difficult for the motor case cap to be transmitted, resulting in low vibration, making the vacuum cleaner quieter, and improving the ease of assembling the motor case cap and casing. The reliability of the fixing can also be improved by forming this.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In Figures 1 and 2, 21 is the rotor, and the shaft 2
2, and exhaust ports 24a7 -, -. −; is open. The anti-load side bracket 24 holds the outer periphery of the stator 26 at its medium heat portion.

A winding 251 a that generates a magnetic field for rotating the rotor 21 is wound around the stator 26 . On the load side, the bearing 23 of the rotor 21 is connected to the air guide 26.
The bearing 23 on the anti-load side of the rotor 23 is held by a housing 24b formed on the anti-load side placket I-24.

In addition, a shaft 22 projects from the load side of the rotor 21 through an air guide 26, and a fan 27 is fixed thereto by a screwdriver 28 to rotate together with the rotor 21. A casing 29 covers the upper part of the fan 27, and a motor case cap 30 is press-fitted into the center of the casing 29. A plurality of bosses 30a are formed.After assembling the motor case cuff 30 and the casing 29, the bosses 30a are formed.
0a is welded. The outer periphery of the motor fan unit 34 is held by the main body 33 via support rubber 31, and the outer periphery of the motor fan unit 34 is entirely covered by a motor case 36. In addition, a step 30b is formed on the outer periphery of the motor case cap 30, and the boss 302L
It is melted simultaneously with the welding to form a retainer 30b'.

Next, the operation of the above configuration will be explained.

In FIG. 1, when an alternating current voltage is applied to the motor 34 and an alternating current flows through the windings 26 & constituting the stator 26, magnetic flux is generated to rotate the rotor 21. By interlinking the rotor 2
1 rotates, and a fan 27 fixed to the rotor 21 rotates at high speed. Then, the air is sucked by the fan 27 through the rotor case cap 30, and is sucked into the rotor 2.
1 and the winding 262L'i of the stator 25 after cooling.
Exhaust port 24 formed below the anti-load side bracket 24
2L is discharged.

Here, there is a residual imbalance between the rotor 21 and the fan 27, so when the rotor 21, the fan 97, and the fan 2γ rotate at high speed (approximately 32,000 rpm), vibrations are generated via the shaft 22, bearing 23, and air guide 26. is transmitted to the casing 29.

However, since the motor fan U is moving about the center of gravity of the rotor 21, the thrust vibration in the center of the casing 29 is reduced.

Therefore, vibration noise is reduced and comfortable cleaning can be achieved.

In addition, since the outer diameter D1 of the upper part of the press-fitting portion of the motor case canf 30 is small, workability during press-fitting is good.

Therefore, the boss 302L can be easily inserted at the beginning of assembly, and at the same time, the boss 302L is inserted into the hole of the casing 29, positioned, and then press-fitted, so that workability is good.

The plurality of bosses 302L formed on the motor case cuff 30 improve the reliability of fixation, and the step 30b is melted to prevent it from coming off 30b'.
Since it is formed in a straight line, mechanical fixing can be easily performed, and the reliability of the fixing can be further improved.

1. The step 30b is made of a material with low heat resistance.
- It is made of resin and is easy to weld.

Effects of the Invention The present invention has a motor case cap in which a motor fan is installed in a casing, and support rubber is placed around the outer periphery of the motor case cap to hold the motor fan in the vacuum cleaner body, so that the motor fan can be held in a part where vibration is small. can reduce vibration transmission to
In addition to realizing a low-noise vacuum cleaner, the outer diameter of the upper part of the motor case camp is smaller than the inner diameter of the casing, so it is very difficult to assemble when press-fitting, which improves work efficiency. By melting the step formed between the book boss and the motor case camp to mechanically prevent it from coming off, it is possible to improve the reliability of fixing the casing and motor case cap.

[Brief explanation of drawings]

FIG. 1 is a partially cut-away sectional view showing an embodiment of the present invention, FIG. 2 is a partially sectional view of a case cap of the same, and FIG. 3 is a partially sectional view showing a conventional motor fan U. 1 1 , -ji 21... Rotor 26... Air guide, 27... Fan, 29... Casing. 30...Motor case cap, 30&
...Boss, 30b...Step, 30b'
...Keeper, 31...Support rubber, 36...Motor case.

Claims (2)

[Claims] (1) A stator and a rotor, a fan that rotates together with the rotor, a resin air guide provided below the fan that holds the load-side bearing of the rotor, and a resin-made air guide that holds the rotor's non-load-side bearing. The fan is comprised of a load-side bracket, and the upper part of the fan is covered with a casing, and the casing has a substantially cylindrical motor case cap protruding from the casing in the center, and the motor case cap is made of resin. The motor case cap is press-fitted into the casing, and the motor case cap is provided with a large number of bosses, and the outer diameter above the press-fitting part of the motor case cap is made small, and the motor case cap is inserted into a hole formed in the casing. A step is provided on the outer periphery of the motor case cap and is melted at the same time as the boss is welded.A support rubber made of a flexible material is installed around the motor case cap for cleaning. An electric blower characterized by being held in the machine body. (2) Claim 1 in which the step part of the motor case cap is made of a material with low heat resistance, and the other parts are made of a material with high heat resistance.
Electric blower as described.