JP2003033298A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To realize a highly reliable vacuum cleaner, such as effectively cooling electric components, and suppressing exhaust temperature from the vacuum cleaner to reduce discomfort to a user. A negative pressure is generated in an exhaust path by using exhaust gas of an intake device to suck in outside air, and the air is mixed with the intake air and exhausted to be discharged outside the cleaner.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an electric motor blower,
The present invention relates to an electric vacuum cleaner having a built-in electric component such as an operation control device and a power cord.

[0002]

2. Description of the Related Art Conventional vacuum cleaners have adopted a system in which electric parts such as an electronic control unit and a power cord are cooled by exhaust gas which has passed through a winding part of an electric motor and becomes hot.

[0003]

Exhaust gas that has passed through a high temperature portion of the electric motor (for example, the temperature rises up to about 100 ° C.) has a considerably high temperature, so that the electronic control portion and the power cord, etc. located downstream thereof are exhausted. There is a natural limit to the cooling effect.

Further, since the exhaust gas from the main body that has passed through the electric motor and the electric parts has a correspondingly high temperature, there is a concern that the exhaust gas may hit the hand holding the main body handle or the body of the user and increase discomfort.

Further, for cooling electric parts such as an electric motor,
Since a large amount of ventilation is required, the electric blower tends to be large in size, which is also a cause of blowing noise.

The present invention has been made in view of the background of the prior art as described above, and effectively cools the electric parts and suppresses the exhaust gas temperature from the cleaner to reduce the discomfort to the user. The purpose is to realize a highly reliable vacuum cleaner.

[0007]

In order to achieve the above object, the present invention utilizes the exhaust gas of an intake device to generate a negative pressure in the exhaust passage to suck the outside air, and mix the intake air with the exhaust gas. To be discharged outside the vacuum cleaner.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a main body of an electric vacuum cleaner according to an embodiment of the present invention.

Inside the main body 4 to which the hose 2 leading to a suction port and an extension pipe (not shown) is connected, a dust collection chamber 6 for storing a paper bag 5 for dust collection, a storage chamber 7 for incorporating a filter, and an intake air An electric blower 8 serving as a device is configured. Here, the storage chamber 7 is attachable to and detachable from the bottom surface side of the main body 4 so that when the filter is clogged, maintenance and inspection or replacement can be performed. Further, the upper space 9 is partitioned from the electric blower 8, and a control device 10 such as an electronic circuit and electric parts such as a cord reel 12 for winding the power cord 11 are housed therein. On the other hand, the exhaust passage 14 of the electric blower 8 is provided with a nozzle 16 whose cross-sectional area is gradually reduced, and a mixing passage 18 facing the downstream side of the nozzle 16. This mixing path 18
Straight conduit 18 having a cross-sectional area larger than the opening area of the nozzle 16
A and an enlarged passage 18B whose cross-sectional area gradually increases toward the downstream side (upward in the figure). A space 20 between the nozzle 16 and the mixing passage 18 is connected to the space 9 through a communication passage 22. An exhaust filter 26 is attached to the exhaust port 24 on the downstream side of the mixing passage 18.

Next, the driving operation and the effect of implementation will be described. First, when the power cord 11 is connected to a power source and the electric blower 8 is started by the control device 10, the dust and air sucked from the suction port flow into the body 4 from the hose 2 and the dust collection chamber 6
The dust is captured by the paper bag 5 inside. The filtered air is filtered again by the filter in the storage chamber 7 downstream of the dust collection chamber 6, then flows into the electric blower 8, passes through the winding portion of the electric motor 8A, and is guided to the exhaust passage 14. . Exhaust gas from the electric motor 8A that has become hot due to passing through the winding portion is exhausted from the exhaust passage 1
From the nozzle 16 arranged in No. 4, it is jetted at high speed toward the mixing passage 18. At this time, a negative pressure is generated in the space 20 around the nozzle 16 due to the action of the jet pump.
The space 9 communicated with the communication passage 22 also has a negative pressure. Therefore, the outside air around the main body 4 is sucked into the space 9 through the opening 4A through which the power cord 11 is put in and taken out, and cools the electric parts such as the control device 10 and the cord reel 12 while passing through the communication passage 22 into the space 20. Inflow. The outside air flowing into the space 20 mixes with the air ejected from the nozzle 16 in the straight pipe path 18A, and gradually increases the pressure by converting the velocity energy into the pressure energy in the expansion path 18B.
It is discharged to the outside of the main body 2 through the filter 26 provided on the No. 4.

In the above-described embodiment, since the electric part in the space 9 is not exposed to the high temperature exhaust gas from the electric motor 8A, it is possible to prevent a problem such as thermal deformation.
In addition, even if the hose 2 becomes narrower due to foreign matter and the amount of sucked air decreases, the electrical components in the space 9 are cooled by the air in the room, which is considerably lower in temperature than the exhaust air of the electric motor 8A. However, an effective cooling effect can be obtained. For this reason,
The blower 8 can be downsized, and noise can be reduced by reducing the air volume. Further, even if a sharp foreign matter is mixed in the dust and the paper bag 5 is damaged, the electric parts such as the control device 10 are not exposed to dust, and therefore damage can be prevented. Further, in the above embodiment, the intake air is taken in through the opening 4A of the power cord 11. However, in order to protect the electric parts such as the control device 10 from the dust contained in the outside air, the outside air is provided through another opening provided with a filter. You may make it suck. Further, since the exhaust air from the main body 4 can be made to have a low temperature by mixing the exhaust air of the electric motor 8A with the intake air from the room, it is possible to improve the problem that the high-temperature exhaust air is blown to the user and the surroundings and causes discomfort. . Further, by increasing the pressure of the exhaust gas in the main body 4 by the above jet pump action, even if the exhaust filter 26 of the exhaust port 24 is clogged and the resistance increases,
Can exhaust smoothly. Further, even if the exhaust port 24 is blocked, it can be exhausted by bypassing the opening 4A through the communication passage 22, so that the electric motor 8A can be prevented from overheating.

Further, in the above-mentioned embodiment, the mixing passage 18 is provided at the rear portion of the main body 4, but by providing the mixing passage 18 directly below the blower 8, the warm exhaust air from the exhaust port 24 is sucked again from the opening 4A. It is also possible to reduce the size of the main body 4 by shortening the rear portion of the main body 4 while avoiding this. Also, space 9
When the inside is not required to be cooled so much, the space 20 is provided at the bottom of the main body 4 to communicate with the outside, and the outside air is introduced from the bottom surface of the main body 4, so that it can be utilized only for lowering the exhaust temperature. Further, in the embodiment, the jet pump mechanism is provided in the exhaust passage 14, but a negative pressure is provided in the exhaust passage 14 by providing a flow passage such as an orifice whose passage cross section is reduced to cause a pressure drop due to a change in speed. It may be made to suck the outside air into the main body 4.

[0014]

As described above with reference to the above-described embodiments, the negative pressure is generated in the main body by using the exhaust air of the intake device to suck the outside air to effectively cool the electric parts. By mixing this intake air and exhaust air and discharging it outside the vacuum cleaner, the temperature of the exhaust gas from the vacuum cleaner can be suppressed and the discomfort to the user can be reduced, etc. to realize a highly reliable vacuum cleaner. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a main body of an electric vacuum cleaner according to an embodiment of the present invention.

[Explanation of symbols]

4 ... Main body, 8 ... Electric blower, 9 ... Space, 14 ... Exhaust passage,
18 ... Mixing path.

Claims (3)

[Claims] 1. An electric vacuum cleaner characterized in that a negative pressure is generated in an exhaust passage by using exhaust gas of an intake device to suck in outside air, and the intake air and the exhaust gas are mixed and discharged out of the cleaner. . 2. A mixing passage having an area larger than the opening is provided opposite to the opening provided in the exhaust passage of the intake device,
By ejecting the exhaust gas from the opening into this mixing passage,
An electric vacuum cleaner, characterized in that a negative pressure is generated around the opening, and the negative pressure is used to suck outside air. 3. The electric vacuum cleaner according to claim 1 or 2, wherein an electric component is arranged between the suction outside air and the mixing passage.