JP2003144353A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner, in which the durability and the reduction of noise of a motor-driven air blower can be improved at low cost and the suction work rate of the vacuum cleaner can be improved. SOLUTION: This vacuum cleaner is provided with the motor-driven air blower 2, which is composed of a fan part 10 having a motor part 11, a suction part 18 and a discharge part 15 and a motor case 19 which has a suction port 20 communicated with the suction part 18 and covers the periphery of the motor- driven air blower 2, and is provided with a communication part 28 on the downstream side of the discharge part 15 while having a partition wall 22, and the motor case 19 is formed with an exhaust port 21 for exhausting a wind 9b generated from the motor-driven air blower 2 from the motor case 19 on the downstream side of the communication part 28. In such a vacuum cleaner, the motor part 11 can be cooled without a high-cost component such as a cooling fan.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling a motor section of an electric blower of an electric vacuum cleaner.

[0002]

2. Description of the Related Art The structure of a conventional vacuum cleaner will be described with reference to FIGS. In FIG. 4, the vacuum cleaner body (hereinafter,
A main body 1 has a built-in electric blower 2 for suction, and a dust collection chamber 3 for accumulating sucked dust is formed in front of the electric blower 2. Reference numeral 4 denotes a connection pipe detachably connected to the main body 1 so as to communicate with the dust collection chamber 3, and one end of a flexible hose 5 is connected to the connection pipe. A hand grip pipe 6 is connected to the other end of the hose 5, and the inside of the dust collection chamber 3 is in communication with the hand grip pipe 6 via the hose 5 and the connection pipe 4. A suction pipe 7 is detachably connected to the hand grip pipe 6, and a suction tool 8 for sucking dust is detachably connected to the tip of the suction pipe 7 so as to communicate with the inside of the dust collection chamber 3.

FIG. 5 is a side view of the electric blower 2. The electric blower 2 includes a fan unit 10 that sucks suction air 9 and a motor unit 11 that rotates an impeller 12 of the fan unit 10. The suction air 9 sucked from the impeller 12 is guided to the outside of the impeller 12 by an air guide 13. Get burned. To improve the suction power of the vacuum cleaner, the motor part with high pressure loss 1
In order to prevent the suction air 9 from passing through 1, the exhaust portion 15 is provided around the fan case 14 that serves as a lid for the impeller 12 and the air guide 13, and the suction air 9 does not pass through the motor portion 11 but around the fan case 14. Is discharged to the outside of the electric fan 2. A cooling fan 1 is provided behind the motor unit 11.
6 is installed, and the cooling fan 16 causes the motor unit 11
The cooling air 17 was sent to cool the motor unit 11.

[0004]

However, in the above-mentioned conventional structure, energy is required to rotate the cooling fan 16, which causes energy loss and hinders improvement of suction power. Further, the noise is increased by the noise directly emitted from the impeller 12 and the air guide 13, which are the sound source of the noise of the electric blower 2, to the outside of the electric blower 2, and the rotating sound of the cooling fan 16 is added. Moreover, the cost is increased by installing the cooling fan 16.

The present invention solves the above-mentioned problems and provides an electric vacuum cleaner which is low in cost and has improved durability and noise reduction of an electric blower, and which can improve the suction power of the electric vacuum cleaner. The purpose is to provide.

[0006]

In order to achieve the above object, the present invention is provided in a stator, a rotor that freely rotates, a motor section including a bracket that covers the stator and the rotor, and an output shaft of the rotor. And an electric blower including a fan portion including a casing arranged on the outer peripheral portion of the impeller and covering the impeller and having an intake portion and a discharge portion on the outer peripheral surface, and an electric blower having an intake port communicating with the intake portion. A motor case that covers the circumference of the motor and has a partition wall that is provided with a communication portion downstream of the discharge portion, and discharges exhaust air emitted from an electric blower from the motor case to the motor case downstream of the communication portion. Exhaust that is once discharged to the outside of the electric blower from the discharge part on the outer peripheral surface of the fan case that is formed to improve the suction work rate with an electric vacuum cleaner Passes through the communication part of the partition wall of the motor case, so the flow direction is constant, and then passes through the motor case that covers the periphery of the electric blower to cool the motor part and then to the exhaust port. More outflow. Therefore, the motor part can be cooled without using high-cost parts such as a cooling fan. Further, since the motor case covers almost the entire electric blower, which is a noise source, noise can be reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
A motor unit including a stator, a freely rotating rotor, a bracket that covers the stator and the rotor, an impeller provided on the output shaft of the rotor, and an impeller disposed on the outer peripheral portion of the impeller to cover the impeller and an intake portion on the outer peripheral surface and discharge. A motor having an electric blower configured by a fan unit made of a casing having a portion, an intake port communicating with the intake unit, covering the periphery of the electric blower, and providing a communication unit downstream of the discharge unit and having a partition wall An electric vacuum cleaner that includes a case and has an exhaust port formed in the motor case downstream of the communication portion to exhaust exhaust air emitted from an electric blower from the motor case, and is formed for improving a suction work rate. Exhaust air that has been once discharged to the outside of the electric blower from the exhaust part on the outer peripheral surface of the fan case passes through the communication part of the partition wall of the motor case, so the flow direction is Constant and become, by passing through the motor case covering further around the subsequent electric blower, after performing the cooling of the motor section, the flow out the exhaust port. Therefore, the motor part can be cooled without using high-cost parts such as a cooling fan. Further, since the motor case covers almost the entire electric blower, which is a noise source, noise can be reduced.

According to a second aspect of the present invention, in the above-mentioned first aspect of the invention, the exhaust port is formed behind the partition wall and on the side of the communicating portion opposite to the output shaft of the rotor. Gather at the communication part of the partition wall of the motor case,
And the exhaust air with a constant flow direction, after that,
The cooling effect of the motor unit can be further improved by flowing so as to cover the entire motor unit in the motor case that covers the periphery of the electric blower.

According to a third aspect of the present invention, in the above-described first or second aspect of the invention, the bracket is provided with an opening, and the bracket gathers at the communicating portion of the partition wall of the motor case and flows. The exhaust air whose direction is constant can cool the stator and the like in the motor section through the opening, and the cooling effect of the motor section can be further improved.

According to a fourth aspect of the present invention, in the above-mentioned third aspect of the invention, the opening portion of the bracket is provided on the communication portion side and the anti-communication portion side of the motor case with respect to the output shaft of the rotor. The exhaust air, which gathers at the communication part of the partition wall of the motor case and has a constant flow direction, passes between the openings to further cool the stator in the motor part. Therefore, the cooling effect of the motor unit can be further improved.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a soundproof material is provided on an outer wall of the motor case. By covering with the case and providing a soundproof material on the outer wall of the motor case, noise reduction can be further realized.

[0012]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a side view of the electric blower 2 and the motor case 19 according to the present invention, FIG. 2 is a side sectional view of the electric blower 2, and FIG. 3 is a perspective view of the electric blower 2. The electric blower 2 is composed of a fan unit 10 having an intake unit 18 that sucks the suctioned air 9, and a motor unit 11 that generates rotational power of the impeller 12 of the fan unit 10. In order to improve the suction power of the electric vacuum cleaner, the impeller 12 and the suction air 9 should be prevented from passing through the motor 11 having a high pressure loss.
A discharge portion 15 is provided around the fan case 14 that covers the air guide 13 that guides the air to the outside of the impeller 12. Mode
Reference numeral 29 of the rotor portion 11 is a rotor having a winding, and the impeller 12 is attached to the output shaft 23. Reference numeral 30 is a stator having a stator winding. Rotor 29 and stator 30
Are covered with a bracket 31.

Around the electric blower 2, a partition wall 22 having a communication portion 28 for collecting exhaust air discharged from the discharge portion 15 is provided downstream of the discharge portion 15 in a motor case 19 which is a two-part component. The motor case 19 covers the air intake part 18 of the electric blower 2 in front of the impeller 12.
Of the exhaust port 2 on the side of the communication port 28 opposite to the output shaft 23 of the rotor 29 and behind the partition wall 22.
1 is formed. Here, the exhaust port 21 does not have to be located below the motor case 19 as shown in FIG.
As long as it is the anti-communication portion 28 with respect to the output shaft 23 of FIG. An outer wall porous hole 24 is opened in the motor case 19 behind the motor portion 11, and the suctioned air 9 is discharged to the outside of the motor case 19 not only from the exhaust port 21 but also from the outer wall porous hole 24. A soundproof material 25 is attached to the motor case outer wall 26 around the fan case 14. Here, the soundproof material 25
May be attached to the outer wall 26 of the motor case other than the periphery of the fan case 14, but it is particularly effective in the vicinity of the fan case 14 having the discharge portion 15 for discharging exhaust air.
Further, the opening portion 27 of the bracket 31 is provided on the communication portion 28 side and the anti-communication portion 28 side of the motor case 19 with respect to the output shaft 23 of the rotor 29, and the partition wall 22 of the motor case 19 has. Exhaust air collected in the communication part 28 and having a constant flow direction is generated by the plurality of openings 2
It is configured to pass between seven.

The operation of the above configuration is as follows.

Suction wind 9a sucked from the impeller 12
Is guided to the outside of the impeller 12 by the air guide 13,
It is discharged to the outside of the electric blower 2 from the discharge part 15 around the fan case 14 without passing through the motor part 11. Electric blower 2
The exhaust air 9b discharged to the outside gathers at the communication part 28 of the partition wall 22 between the motor case 19 and the fan part 10 and the motor part 11, and the flow becomes constant.
9 to the output shaft 23, the communication portion 2 of the motor case 19
8 and the opening 27 provided on the anti-communication portion 28 side, respectively, and the anti-communication portion 2 with respect to the output shaft 23 of the rotor 29.
By discharging from the exhaust port 21 to the 8 side, the motor part 11 can be cooled. Therefore, unlike the conventional example, the motor unit 11 can be cooled without the cooling fan 16, so that the energy required for the rotation of the cooling fan 16 is not required and the suction power can be further improved.
Further, since the rotation noise of the cooling fan 16 is eliminated, an increase in noise can be suppressed. Further, since the cost of the cooling fan 16 is eliminated, the cost increase can be suppressed. Further, by wrapping the discharge portion 15 around the fan case 14 which is a noise source in the motor case 19, it is possible to further suppress the increase in noise. In addition, the fan case 14 which is a noise source
Since the outer wall porous hole 24 is formed at a position distant from the surrounding discharge portion 15, the exhaust area can be increased while suppressing the increase in noise, the pressure loss inside the motor case 19 is reduced, and suction work is further performed. The rate can be improved.

[0017]

According to the present invention, it is possible to provide an electric vacuum cleaner which can be manufactured at low cost and can improve the durability and noise of an electric blower and can improve the suction power of the electric vacuum cleaner.

[Brief description of drawings]

FIG. 1 is a side view of an electric blower and a motor case of an electric vacuum cleaner showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the electric blower.

FIG. 3 is a perspective view of an electric blower and a motor case of the electric vacuum cleaner.

FIG. 4 is a side view of a conventional vacuum cleaner.

FIG. 5 is a side view of the electric blower of the electric vacuum cleaner.

[Explanation of symbols] 2 electric blower 9 suction wind 10 Fan section 11 Motor part 12 impeller 13 Air guide 14 fan case 15 Discharge part 18 Intake section 19 motor case 20 air intake 21 Exhaust port 22 division wall 23 Output shaft 25 Soundproofing material 26 Motor case outer wall 27 openings 28 Communication 29 rotor 30 stator 31 bracket

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazuhisa Morishita             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 3B006 BA05 BA06 FA01 LA07                 3B057 AA24

Claims (5)

[Claims] 1. A motor portion including a rotor that freely rotates with a stator, a bracket that covers the stator and the rotor, an impeller provided on an output shaft of the rotor, and an outer peripheral surface that is arranged on an outer peripheral portion of the impeller and covers the impeller. An electric blower configured by a fan section including a casing having an intake section and an exhaust section, and an air blower that has an intake port communicating with the intake section and covers the periphery of the electric blower, and a communication section is provided downstream of the exhaust section. An electric vacuum cleaner comprising a motor case having a partition wall, and an exhaust port for exhausting exhaust air generated by an electric blower from the motor case, the exhaust case being formed in the motor case downstream of the communication portion. 2. The electric vacuum cleaner according to claim 1, wherein the exhaust port is formed on the rear side of the partition wall and on the side opposite to the communication part with respect to the output shaft of the rotor. 3. The electric vacuum cleaner according to claim 1, wherein the bracket has an opening. 4. The electric vacuum cleaner according to claim 3, wherein the opening of the bracket is provided on each of the communication part side and the anti-communication part side of the motor case with respect to the output shaft of the rotor. 5. The electric vacuum cleaner according to claim 1, wherein a soundproof material is provided on the outer wall of the motor case.