KR20080108021A - Electric fan and electric cleaner using the same - Google Patents

Abstract

An electric blower and an electric cleaner using the same are provided to restrain the occurrence of noise or to reduce noise in a low wind velocity or high vacuum area. An electric blower comprises a centrifugal fan(2) installed to a rotary shaft of an electric motor and provided with a plurality of fan blades(34) spaced out from each other and fitted, supported between a pair of facing plates, and a plurality of diffusers located on the outer circumference of the centrifugal fan against an outlet(35) formed on the circumference of the centrifugal fan, wherein the front end of the fan blade is inclined from one end to the other end in the rectilinear shape.

Description

Electric blower and electric vacuum cleaner using it {ELECTRIC FAN AND ELECTRIC CLEANER USING THE SAME}

TECHNICAL FIELD The present invention relates to an electric blower and an electric vacuum cleaner using the same, and more particularly, to an electric blower in which the shape of a fan blade in a centrifugal fan is improved and an electric vacuum cleaner using the same.

In general, an electric vacuum cleaner has an electric blower and a dust collecting means in the cleaner body, and draws dust together with air from the surface to be cleaned by the suction force of the electric blower, separates dust and air from the dust collecting means, and accumulates dust in the dust collecting means, The clean air separated from the dust is exhausted to the outside of the cleaner body.

The electric blower is composed of a motor and a fan rotated by the motor, and the fan has a centrifugal type and includes a diffuser for rectifying the air discharged from the centrifugal fan.

In particular, the electric blower used for the vacuum cleaner is required to reduce noise.

As a countermeasure against this bass, as shown in FIG. 11, the centrifugal fan 51 whose outer diameter of the fan blade 52 is smaller than the outer diameter of the pair of plates 53 is proposed. However, the centrifugal fan 51 of this shape is excellent in hearing in normal operation, but has low wind volume and noise in a high vacuum region, compared to a general centrifugal fan in which the outer diameter of the fan blade and the outer diameter of the plate are equal. There was a case.

Moreover, in order to suppress the high frequency sound which arises from a centrifugal fan, the electric blower which provided the inclined air guide (diffuser) in the outer peripheral direction of an impeller is proposed (for example, refer patent document 1).

[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-115698

The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide an electric blower capable of suppressing the occurrence of noise or reducing the noise even in a low air volume and a high vacuum region, and an electric vacuum cleaner using the same.

In order to achieve the above object, the electric blower according to the present invention is provided on a rotating shaft of an electric motor, and has a centrifugal fan having fan blades in which a plurality of sheets are spaced apart from each other and supported by a pair of opposing plates; In an electric blower having a diffuser having a plurality of diffuser blades located on the outer circumference of the centrifugal fan opposite the discharge port formed on the peripheral surface of the fan, the tip of the fan blade is linear from one end to the other end It characterized in that the inclined to.

Moreover, the vacuum cleaner which concerns on this invention is characterized by accommodating the said electric blower in the main body.

According to the electric blower which concerns on this invention, the electric blower which can suppress the generation | occurrence | production of a noise in a low air volume and a high vacuum region, or can reduce a noise can be provided.

Moreover, according to the vacuum cleaner which concerns on this invention, the vacuum cleaner which can suppress the generation | occurrence | production of a noise in a low air volume and a high vacuum area, or can reduce a noise can be provided.

The electric blower which concerns on one Embodiment of this invention is demonstrated with reference to drawings.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which cuts out and shows the structure of the electric blower of one Embodiment of this invention.

As shown in Fig. 1, the electric blower 1 includes a metal centrifugal fan 2, a motor 4 for rotating the centrifugal fan 2 via a rotation shaft 3, and a case for storing them. 5) consists of. Moreover, in one Embodiment of this invention, the centrifugal fan 2 side in the axial direction of the rotating shaft 3 is front, front surface, front side, and the motor 4 side is rear, rear surface, or rear side. It demonstrates using terms, such as these.

This case 5 is comprised by the fan cover 6 which covers the centrifugal fan 2, and the motor case 7 which accommodates the motor 4. As shown in FIG.

The motor 4 uses, for example, a motor with a brush, and the motor case 7 has a shape structure in which the rear plate portion 11 is bottomed, and the fan cover 6 side is opened as the opening 12. And the motor 4 is stored.

The bearing 12a is provided inside the bearing housing portion 12b provided so as to protrude in a substantially cylindrical shape toward the rear of the central portion of the rear plate portion 11 on the rear surface side in the axial direction of the motor case 7. Is housed.

The opening 12 of the motor case 7 is provided with a screw 14 or the like such that the frame 8 is orthogonal to the rotation shaft 3 of the motor 4.

The frame 8 has a bridge shape that extends radially from the rotation shaft 3 portion of the motor 4. The lower end of the inner circumferential side of the fan cover 6 is integrated with the motor case 7 to form the case 5 of the electric blower 1.

In addition, the size of the coupling part of the motor case 7, the frame 8, and the fan cover 6 may be substantially the same. In the substantially center of this frame 8, the bearing accommodating part 13b which protrudes in a substantially cylindrical shape toward the front, and opened the through-hole for rotation shaft 3 (not shown) is provided. The bearing 13a is accommodated in this bearing accommodation part 13b.

The fan cover 6 also covers the centrifugal fan 2 and the diffuser 21. The fan cover 6 has a suction opening 6a opposed to the air inlet 31 of the centrifugal fan 2 at the center of its front face, and a rear opening is formed over the entire rear face. It is formed in a substantially cylindrical shape.

On the other hand, the motor 4 is comprised by the stator 15 fixed to the motor case 7, and the rotor 16 arrange | positioned inside this stator 15. As shown in FIG. Both ends of the rotary shaft 3 at the center of the rotor 16 are axially rotatably supported by the bearings 12a and 13a. Moreover, a blowout port (not shown) as an exhaust port is formed in the circumferential surface near the rear surface of the motor case 7 as an opening.

In addition, the diffuser 21 is fixed to the suction front side of the frame 8.

As shown in Fig. 2A, the diffuser 21 is formed in a substantially disc-shaped disc portion 22 and a through hole through which the rotating shaft 3 penetrates at an approximately center of the disc portion 22. 23, screw holes 24a and 24b for screwing to the frame 8, and a plurality of arc-shaped blades standing up near the outer periphery at one side of the diffuser 21 so as to be located at the outer periphery of the fan 2; As shown in Fig. 2B, a plurality of arc-shaped blades 26 are formed on the rear surface of the disc portion 22, which is formed in a spiral shape.

The diffuser 21 is inserted into the outer circumference of the bearing housing 13b of the frame 8 so as to face the frame 8 and is fixed to the frame 8 with screws through the screw holes 24a and 24b. do.

3 to 5, the centrifugal fan 2 has the same diameter as that of the front plate 32 on the side of the air inlet 31 and the front plate 32, and is installed opposite thereto. It consists of a plurality of circular arc-shaped fan blades 34 which are sandwiched and supported between one rear side plate 33. The fan blades 34 are spaced apart from each other.

The fan blade 34 is provided with a plurality of mounting protrusions 34a (see FIG. 5), and the mounting protrusions 34a are provided with mounting holes 32a formed in the front plate 32 and the rear plate 33. Caulking to fit into 33a), each of the fan blades 34 is fixed with the fan blades 34 fitted in the front plate 32 and the rear plate 33.

The air intake port 31 is formed in the center of the front plate 32, and the discharge port 35 is formed between the front plate 32 and the outer peripheral ends 32b, 33b of the rear plate 33.

As shown in Fig. 4, the front end portion 34b of the fan blade 34 has one end (front end) 34b ₁ inside the outer peripheral end 32b of the front plate 32 (fan shaft center side). The other end (rear end) 34b ₂ is located inside the outer circumferential end 33b of the rear plate 33. And it is inclined linearly towards the other end (34b ₂₎ from one end (34b ₁₎ the other end (34b ₂₎ has one end (34b ₁₎ than the axial center so as to be positioned on the fan side.

Therefore, the diameter d1 of the front plate 32, the diameter d2 of the rear plate 33, the diameter d3 of the circle on which one end 34b ₁ is located, and the other end 34b ₂ are located. When the diameter d4 of the circle is set, d1 = d2, d1> d3, d3> d4.

In addition, the tip portion 34b of the fan blade 34 is not limited to a rigid straight shape as in the present embodiment, and can be regarded as a substantially straight shape by a curved shape or a combination of a curve and a straight line, a combination of a straight line and a straight line. Embodiment of the range which exists is defined in this invention as linear form including these Examples.

In the above structure, when the rotary shaft 3 rotates, the centrifugal fan 2 rotates with this rotation, and air is sucked by this rotation. This air is blown out from the discharge port 35 through the centrifugal fan 2 from the suction opening 6a formed in the front face side of the fan cover 6. The air flows along the inner circumferential surface of the fan cover 6 so as to extend in the axial direction between the arc-shaped blades 25. Moreover, this air flows toward the center of the diffuser 21 in a spiral shape between the arc-shaped blades 26 on the back surface of the disk part 22. As shown in FIG. In this way, the diffuser 21 rectifies the air blown out from the discharge port 35 of the centrifugal fan 2 and guides it to the motor 4. The air guided to the motor 4 cools the motor 4 and then is discharged out of the motor case 7.

According to a test conducted by the present inventors, the electric blower is a tip end portion of a fan blade in which noise is sandwiched between the front plate and the rear plate, and each outer diameter at the outer peripheral end of the contact with the front plate and the rear plate. It was smaller and quieter than the electric blower of this equivalent common fan. In addition, even if the voltage was changed to change the rotation speed, the noise was smaller and quieter than a general fan having the same outer diameter. The inclined tip portion 34b of the fan blade 34 is linearly inclined from one end portion 34b ₁ to the other end portion 34b ₂ , thereby reducing the amount of noise and reducing noise in the high vacuum region. It is suitable for mass production.

According to the electric blower of this embodiment, the electric blower which can suppress the generation | occurrence | production of a noise or can reduce a noise in a low air volume and a high vacuum area is implement | achieved.

As shown in Fig. 6, the electric blower 1 of the present invention is built in the cleaner main body 42 of the electric vacuum cleaner 41, and the dust collector 43a of the centrifugal separation method is located upstream of the electric blower 1; The dust collecting means 43 which consists of a pleat-shaped dust-collecting filter 43b by which the wrinkle was gathered is arrange | positioned. A hose 44, an extension pipe 45, and a nozzle 46 are connected to an upstream side of the dust collecting means 43 of the cleaner body 42.

The vacuum cleaner 41 incorporating the electric blower 1 of the present invention has a low air volume, and even if the area of the ventilation flow path is narrowed due to dust stored in the high vacuum region, that is, the dust collecting means 43, the occurrence of noise is suppressed or The noise can be reduced and quiet, and quiet even when the voltage is changed.

In addition, according to the vacuum cleaner according to the present invention, a vacuum cleaner capable of suppressing the occurrence of noise or reducing the noise in a low air volume and high vacuum region is realized.

(Example)

The noise at the time of low wind volume and the maximum air volume is measured using the electric blower (example) of this invention shown in FIG. 1, and it compares with the conventional electric blower (comparative example) shown in FIG.

(1) test conditions

1) Air flow rate: Low air flow realized state (vacuum degree: large), maximum air flow realized state (vacuum degree: small)

2) Measuring method: In the state of realizing maximum air flow, place the motor on urethane so that carbon is horizontal.

At low wind speeds, the motor is set so that the carbon is horizontal to the fallopian tubes.

The sound collecting microphone is set 1 m above the center of the motor full length. When the voltage is 100 V, the valve angle is adjusted to a low air volume realization state such that the air volume Q = 1.3 m 3 / min, and noise measurement is performed as it is.

The degree of vacuum is measured in the upstream portion of the fan.

3) Measuring environment: air temperature 24 ℃, humidity 48%, air pressure 729 mmHg

(2) results

1) Low wind volume realization state: Table 1 and FIG.

Table 1

As can be seen from Table 1, the comparative example is 83.4 kPa (A) at the voltage of 40 V in the low air volume realized state and the air volume Q = 0.76 m 3 / min, while the noise of the example is 81.1 kPa (A). At the voltage of 60 V and the air volume Q = 0.99 m 3 / min, the comparative example is 91.8 mPa (A), while the noise of the example is 89.5 mPa (A). At a voltage of 80 V and air flow Q = 1.16 m 3 / min, the comparative example is 90.8 mPa (A), while the noise of the example is 88.3 mPa (A). When the voltage was 100 V and the air volume Q = 1.3 m 3 / min, the noise of the example was 96.1 kA (A), while the comparative example was 94.5 kA (A), and the low air volume realized state (air volume Q = 0.76 to 1.3 m 3 / min) In the example was found that the noise value is smaller and quieter than the comparative example.

Also, as can be seen from Fig. 7, even in the low air volume realization state, even if the voltage is changed to change the rotation speed, the embodiment shown by the solid line shows the noise value over approximately the entire area as compared with the comparative example shown by the dotted line. I could see this small and quiet.

In addition, as shown in Fig. 8, in the correlation measurement of the frequency of the noise and the noise value at the voltage 60 V in the low air volume realization state, it can be seen that the noise is smaller than that of the comparative example over the entire frequency range. there was.

In particular, in the frequency range where a peak of 10 Hz or more is generated, the noise value is clearly smaller than that of the comparative example, and therefore, it can be seen that the occurrence of noise or reduction of the noise is achieved.

2) Maximum air volume realization state: Table 2 and FIG.

[Table 2]

 As can be seen from Table 2, the comparative example is 81.6 kPa (A) at the voltage of 40 V in the maximum air volume realized state and the air volume Q = 1.68 m 3 / min, while the noise of the example is 82.1 kPa (A). When the voltage is 60 V and the air volume Q = 2.18 m 3 / min, the noise of the example is 87.6 Pa (A), whereas the comparative example is 88.2 Pa (A). In addition, at the voltage of 80 V and the air volume Q = 2.62 m 3 / min, the noise of the example is 89.6 kPa (A), whereas the comparative example is 89.6 kPa (A). At a voltage of 100 V and a maximum air flow Q = 3.00 m 3 / min, the noise of the example was 92.0 kPa (A), while the comparative example was 91.6 kPa (A), and the maximum air flow realized state (air flow Q = 1.68 to 3.00 m 3 / min ), Even if the voltage is changed to change the rotational speed, the noise values of the examples and the comparative examples do not differ significantly.

Also, as can be seen from Fig. 9, in the entire region of the maximum air volume realized state, the noise values of the examples and the comparative examples are not significantly different.

In addition, as shown in Fig. 10, in the correlation measurement of the frequency of the noise and the noise value at the voltage of 60 V in the maximum air volume realized state, the noise is represented by the solid line and the comparative example represented by the dotted line over the entire frequency range. There is no big difference.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a partially cut away configuration of an electric blower of an embodiment of the invention.

Fig. 2 is a diagram showing a configuration example of the diffuser used in the electric blower of the embodiment of the present invention, (a) is a plan view, and (b) is a bottom view.

3 is a conceptual diagram of a centrifugal fan used in an electric blower of an embodiment of the present invention.

Fig. 4 is a longitudinal sectional view of the centrifugal fan used for the electric blower of the embodiment of the present invention.

Fig. 5 is a plan view of a fan blade of the centrifugal fan used in the electric blower of the embodiment of the present invention.

6 is a conceptual diagram of an electric vacuum cleaner according to an embodiment of the present invention.

Fig. 7 is a voltage-noise level diagram of a noise test result using an electric blower according to an embodiment of the present invention (low wind amount realization state).

Fig. 8 is a frequency-noise value diagram of a noise test result using an electric blower according to an embodiment of the present invention (low wind amount realization state).

9 is a voltage-noise level diagram (maximum air volume realization state) of a noise test result using an electric blower according to an embodiment of the present invention.

Fig. 10 is a frequency-noise value diagram (maximum air volume realization state) of a noise test result using the electric blower according to the embodiment of the present invention.

Fig. 11 is a longitudinal sectional view of a centrifugal fan used in a conventional electric blower.

<Explanation of symbols for the main parts of the drawings>

1: electric blower

2: centrifugal fan

3: axis of rotation

4: motor

5: case

6: fan cover

6a: suction opening

7: motor case

8: frame

21: diffuser

25, 26: circular arc blade

31: air intake

32: front side plate

32b: outer peripheral end

33: rear side plate

33b: outer peripheral end

34: fan blade

34b: tip

34b ₁ : one end

34b ₂ : the other end

35 outlet

Claims (3)

A centrifugal fan provided on a rotating shaft of the electric motor, the fan having a fan blade in which a plurality of sheets are spaced apart from each other between a pair of opposing plates; In the electric blower having a diffuser having a plurality of diffuser blades located on the outer circumference of the centrifugal fan opposite the discharge port formed on the peripheral surface of the centrifugal fan, the tip of the fan blade toward the other end from one end thereof An electric blower characterized by inclining in a straight line shape. 2. The fan blade according to claim 1, wherein the fan blade is provided between a front side plate on the air inlet side and a rear side plate having the same diameter as the front side plate and opposing the front side plate. An end is located on the fan shaft center side than the outer peripheral end of the front plate, the other end is located on the fan shaft center side than one end of the front plate. An electric vacuum cleaner comprising the electric blower according to claim 1 or 2 in a vacuum cleaner body.

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