JPS6021728A - Electromotive blower support of electric cleaner - 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] [Field of application of the invention] This invention relates to an electric blower support device for a remover.

[Background of the invention]

Conventional electric blower support devices for vacuum cleaners support the front and rear of the electric blower with anti-vibration rubber, but vibration insulation was insufficient and the noise was large.

That is, FIG. 1 is a partially opened front view of a conventional vacuum cleaner, where IA is the vacuum cleaner body, 28 is a dust case, and 3 is a partially opened front view of a conventional vacuum cleaner.
A is the main body case, 208 is an electric blower, A is a soft anti-vibration rubber, and B is a hard anti-vibration rubber.

Therefore, this conventional electric blower support device has a front-rear support system in which the front part of the electric blower 20A is supported by anti-vibration rubber A, and the rear part is supported by anti-vibration rubber B. The vibration transmission rate was high, and the noise caused by the rotational vibration of the electric blower 2OA could not be reduced, making it impossible to lower the noise level.

In addition, due to its own weight, the electric blower 20A tilts its axis of rotation with respect to the horizontal, resulting in uneven pressure distribution between the anti-vibration rubber A and the front partition wall, resulting in poor airtightness. However, in the illustrated configuration, because of the above-mentioned support mode, the front part of the electric blower 20A is downward and tends to become horizontal when thrust is applied, but the rear part of the electric blower 20A is not supported by the anti-vibration rubber. Since it was fixed at B, it was difficult to keep it level.

[Purpose of the invention]

An object of the present invention is to provide an electric blower support device for a vacuum cleaner that can improve vibration insulation and reduce noise.

[Summary of the invention]

The structure of the electric blower support device for a vacuum cleaner according to the present invention is such that, in a main body case of a vacuum cleaner that incorporates an electric blower consisting of a fan casing and an electric motor, the front part of the fan casing of the electric blower is covered with anti-vibration rubber. In the axial direction, the fan casing is clamped between the front inner wall of the main body case and the axial support section provided at the rear inside the main case, and in the radial direction, the fan casing is supported near the front inside the main case. It is configured to be supported by the provided radial support portion.

As an additional note, to support the electric blower when it is in operation,
Using the thrust generated by the static pressure generated by the electric blower, the electric blower is attracted and held on the front partition wall of the main body case via anti-vibration rubber, and when the electric blower stops, the fan is turned off to prevent the electric blower from falling off. Since the outer circumference of the rear end of the casing is supported in the axial direction from the rear, during operation,
Since the structure is supported by the main body case with only one vibration isolating rubber, vibration insulation is improved.

[Embodiments of the invention]

Each embodiment of the nAK of the present invention will be described with reference to the drawings.

First, FIG. 2 is a longitudinal sectional view of a vacuum cleaner equipped with an electric blower support device according to an embodiment of the present invention, FIG. 3 is a partially opened front view showing the inner wall of the main body case, and FIG. The figure is a perspective view showing the inner wall of the main body case, Figure 5 is a perspective view of the vibration isolating rubber, Figure 6 is a partial sectional view showing the electric blower in the stopped state, and Figure 7 is the same in the operating state. FIG. 8 is a graph showing the relationship between thrust and displacement limit thrust, FIG. 9 is a graph showing the relationship between imaging number ratio and vibration transmissibility, and FIG. FIG. 11, a graph diagram showing a 1/3 octave band analysis of noise, is a graph diagram showing the relationship between the amount of fan imbalance and the noise level.

That is, in FIG. 2, the vacuum cleaner main body 1 is divided into front and rear parts, and the front part has a dust collection case 2. At the rear is the main body case 3.

These two cases are assembled by inserting the protrusion 5 protruding from the bottom of the dust collection case 2 into the receiving part 6 provided at the bottom of the main body case 3, and connecting the crank 7 attached to the top of the dust collection case 2 and the main body. The case 3 can be divided by connecting it to the clamp receiving part 8 on the upper part of the case 3.

The dust collection case 2 opens at the rear, and has a suction port 9 at the front d1 for sucking in dust, and a check valve 10 at the rear.
There is. A dust collection device 11 for filtering dust is removably attached to the rear opening 4 of the dust collection case 2. A packing lla is attached to the outer periphery of the dust collection device 11 to maintain airtightness between the dust collection device 11 and the inner wall of the dust collection case 2.

The main body case 3 is formed with an intake port 13 on a partition wall 12 on the front inner wall, an exhaust port 4 on the rear upper wall surface, and a handle portion 15 at the center of the upper part.

In addition, a cord reel chamber 1 is provided at the rear of the main body case 3.
6 and a cord-type cable 17 are housed therein, and a switch 18 is mounted inside and above the main body case 3.

Furthermore, an electric blower chamber 1 is provided at the front inside of the main body case 3.
9, and an electric blower 20 is housed therein.

This electric blower 20b has a front fan casing 20a.
and a rear electric motor 20b, and the outer diameter of the fan casing 20a is larger than the outer diameter of the electric motor 20b.

In addition, the electric blower 20 covers the front part of the fan casing 20a with a cylindrical anti-vibration rubber 21 in order to prevent vibrations and maintain airtightness. It is in contact with the section 22.

Furthermore, a stopper to prevent the electric blower 20 from falling off, and a stopper for preventing the electric blower 20 from falling off,
It is supported by the rear end outer periphery 20C of the fan casing 20a, which is larger than the outer diameter of the fan casing 20a, and by the axial support part 23 provided on the main body case 3.

In order to prevent the electric blower 200 from rotating, as shown in FIG.
A protrusion 20d protruding radially from the outer periphery 20C of the rear end is fitted, and at the same time, a groove 24 provided in the main case 3 receives the end 21a.

Furthermore, in order to receive the impact of the electric blower 20 when the vacuum cleaner main body 1 falls, a shock absorbing section 2 is provided at the rear of the electric blower 20.
5, with a round hole in the center, and an electric blower bore 20
d is inserted. Moreover, on the outer periphery of the electric blower 20,
It is wrapped with a sound absorbing cover 26 for soundproofing.

In the above configuration, the dust sucked in through the suction port 9 is trapped inside the dust collection case 2 by forcing the check valve 10 open by wind pressure.

On the other hand, the air filtered and purified by the dust collector 11 is sent to the air intake port 13. It passes through the electric blower 2o and is discharged from the exhaust port 14.

To remove the dust accumulated in the dust collection case 2, press the clamp 7.
The dust collection case 2 is removed from the main body case 3, and the dust collection device 11 is removed and thrown away.

As shown in FIG. 6, 20 electric blowers are held in contact with the axial support 23 when stopped, but when in operation,
As shown in FIG. 7, due to the static pressure generated by the electric blower 200, a thrust force P acts forward, compressing the vibration isolating rubber 21, and separating the axial support portion 23 and the fan casing 20a, causing the electric blower 200 to is maintained by thrust P.

Therefore, vibrations from the electric blower 20 to the axial support portion 23 are completely insulated.

Here, the conditions necessary for the electric blower 20 to maintain its own weight without falling off are as follows.

The thrust P and displacement S in the electric blower 20 are calculated by the following equation.

8=- to Here, D: anti-vibration rubber opening diameter.

H: Electric blower vacuum degree.

k: Anti-vibration rubber spring constant.

On the other hand, the critical thrust Po required to overcome the dead weight W and support the electric blower 20 can be calculated as follows from the combination of moments centered at point Q in FIG.

Here, W: dead weight of the electric blower.

L: From fulcrum Q to electric blower center of gravity G distance.

d: Fan casing outer diameter.

FIG. 8 shows the relationship among thrust force P, displacement Ji,s, and limit thrust r+o.

At an air volume within the usage range indicated by the air volume of the vacuum cleaner, the thrust force P generated by the electric blower 20 is the limit thrust force P.

It can be seen that there is no risk of the electric blower 20 falling off. At the same time, even at the lowest thrust 1)-1 shown in the figure, the fan casing 20a is pushed further than the axial support part 23 by S' shown in the figure.
It can be seen that the vibration is isolated by separating the

In this way, the rear part of the electric blower 20 is free, so the vibration transmission rate is lower than that of a system in which the electric blower 20 is supported at the front and rear. Figure 9 shows this, a
indicates the vibration transmissibility of the conventional one, and b indicates the vibration transmissibility of the one according to this embodiment.

As a result, the noise caused by the rotational vibration of the electric blower 20 is reduced, and the noise level can be lowered.

FIG. 10 shows the results of 1/3 octave band analysis of the noise level.

In the figure, C is the conventional one, and d is the one of this embodiment.

The effect of reducing the noise level in the vicinity of 400 I-IZ, which is the rotational sound of the electric blower, is large, and the overall noise level is reduced.

FIG. 11 shows the relationship with the fan unbalanced noise level.
Each shows the overall level of the conventional one and the one of this embodiment.

As can be seen from the figure, the noise reduction effect is greater in a fan with a large fan imbalance in which the rotational-secondary sound is dominant.

On the other hand, in the electric blower 20, the rotation axis is tilted with respect to the horizontal due to its own weight, and the pressure distribution between the vibration isolating rubber 21 and the partition wall 12 on the front inner wall becomes uneven, resulting in poor airtightness. It is something.

・'As mentioned above, in the conventional support structure shown in Fig. 1, the front part of the electric blower 20A lowers and tries to become horizontal when thrust is applied, but the rear part of the electric blower 20A is stiff. Because it was fixed with anti-vibration rubber B, it was difficult to keep it level.

In addition to this, the electric blower 20 according to this embodiment
The rear part of the robot lowers, but since the rear part is not fixed, it tends to become horizontal when the thrust moves by one. Therefore, it has good airtightness.

Furthermore, since there is only one vibration isolating rubber, it is easier to assemble than conventional ones, and there is less chance of the vibration isolating rubber coming loose during assembly, which also improves airtightness.

From the above, compared to the conventional electric blower support system, there is less variation in suction power due to poor airtightness.

Furthermore, in the conventional vacuum cleaner shown in FIG. 1, the impact when dropped is received by the anti-vibration rubber B at the rear of the electric blower 20A, but in this embodiment, the small impact is absorbed by the axial support part 23.
The axial support portion 21 of the
is deformed, and the shock buffering section 24 also receives the rear part of the electric blower 20.

Therefore, the axial support portion 23 can be prevented from being damaged and can withstand large impacts.

As described above, in this embodiment, the electric blower 2
When the electric blower 20 is in operation, the electric blower 20 is supported by thrust, and when it is stopped, it is supported by the axial support part 23, so the number of parts can be reduced compared to the conventional one.

At the same time, vibration insulation can be improved and noise can be reduced.

Since the rear part of the electric blower 20 is not fixed yet,
The electric blower @20 can be easily returned to the horizontal position, the pressure distribution on the airtight surface is uniform, and the vibration isolating rubber 21 is less likely to turn over during assembly, which reduces variations in the suction power.

Furthermore, since the shock absorbing section 24 is provided at the rear of the electric blower 20, it can withstand large shocks.

In addition to the above, in the hole 21b of the end 21a of the vibration isolating rubber 21,
Since the protrusion 20d of the fan casing 20a is fitted and the end portion 21a is received in the groove 24 of the main body case 3, rotation of the electric blower 20 can be prevented.

Next, FIG. 12 is a partially opened front view of a vacuum cleaner including an electric blower support device according to another embodiment of the present invention.

In the figure, the same reference numerals as in Figure 2 indicate equivalent parts, and 21
-1 is a vibration-proof rubber, and 23-1 is an axial support portion.

The difference between this embodiment and the previous embodiment is that in the previous embodiment, the outer periphery 20C of the rear end of the fan casing was directly supported by the axial support portion 23; As shown, the vibration isolating rubber 21-1 is extended rearward and is inserted between the rear end outer circumference 20C of the fan casing and the axial support portion 23-1.

As a result, this embodiment can achieve the same effect as the previous embodiment, and can further reduce the impact when dropped.

〔Effect of the invention〕

According to the present invention, it is possible to provide an electric blower support device for a vacuum cleaner that can improve vibration insulation and reduce noise, and can be said to be an invention with excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a partially opened front view of a conventional vacuum cleaner, FIG. 2 is a longitudinal sectional view of a vacuum cleaner equipped with an electric blower support device according to an embodiment of the present invention, and FIG. , FIG. 4 is a perspective view showing the inner wall of the main body case, FIG. 5 is a perspective view of the anti-vibration rubber, and FIG. 6 is a front view of the electric blower. A partial sectional view showing a stopped state,
FIG. 7 is a partial cross-sectional view showing the operating state, FIG. 8 is a graph showing the relationship between thrust and displacement limit thrust, and FIG. 9 is a graph showing the relationship between frequency ratio and vibration transmission rate. 10 is a graph showing 1/3 octave band analysis of noise, FIG. 11 is a graph showing the relationship between fan ambiguity amount and noise level, and FIG. FIG. 7 is a partially opened front view of a vacuum cleaner including an electric blower support device according to another embodiment. 1... Vacuum cleaner body, 2... Dust collection case, 3...
Main body case, 12... Partition wall, 20... Electric fan g
, 20a...Fan casing, 20b...Electric motor, 20C...Fan casing rear end outer periphery, 21,2
1-1... Vibration-proof rubber, 22... Radial direction support part, 2
．． 3.23-1... Axial support part. Agent Patent attorney Kosaku Fukuda (and 1 other person) Kaya 1 Mugyo 2 eyes $3 Eyes 3 Kaya 4 Koz2 Kaya 5 Eyes 21 Hisaya Otsugo Kaya 70 8 Kuchi Kaya 9 Eyes #'vJ number ratio 3155θρ IK 2K IK Each octa-fu y>) 4 civilian 1 skin power (/h) 1st I backfu? 〉A〉Hara〉Quantity (Miyako@2) Figure 2

Claims (1)

[Scope of Claims] 1. A main body case of a vacuum cleaner containing a built-in electric blower consisting of a fan casing and an electric motor;
In the axial direction, the fan casing is held between the front inner wall of the main body case and an axial support provided at the rear inside the main case, and in the radial direction, the fan casing is held between the front inner wall of the main case and an axial support provided near the front inside the main case. An electric blower support device for a vacuum cleaner, characterized in that the electric blower support device is configured to be supported by a radial support portion. 2. An electric blower support device for a vacuum cleaner according to claim 1, wherein the outer periphery of the rear end of the fan casing is directly supported by an axial support portion. 3. A vacuum cleaner according to claim 1, in which the vibration isolating rubber is extended rearward and inserted between the outer circumference of the rear end of the fan casing and the axial support part. electric blower support device.