JP2002315696A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of dust removing performance by sufficiently securing a sucking air quantity in a suction tool, and to cool a motor- driven air blower even if a filter is clogged. SOLUTION: This vacuum cleaner has a cooling hole B18 for communicating a motor-driven air blower chamber 6 with outside air, and is provided with an air duct opening-closing valve 21 for opening a cooling air duct A20 by detecting exhaust air temperature rise in the motor-driven air blower by mesh- clogging of the filter such as a paper bag, and prevents a reduction in the service life and thermal deterioration by efficiently cooling the motor-driven air blower 4, and prevents the deterioration of the dust removing performance without reducing the sucking air quantity by closing the air duct opening-closing valve 21 when clogging of the filter 2 is slight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vacuum cleaner,
In particular, it relates to cooling of an electric blower.

[0002]

2. Description of the Related Art The structure of a conventional vacuum cleaner of this type will be described with reference to FIGS.

As shown in FIG. 7, reference numeral 1 denotes a cleaner body, which has a dust collecting chamber 3 in which a filter 2 such as a paper bag can be mounted.
On the rear side, there are provided an electric blower room 6 having a built-in electric blower 4 and communicating with the dust collecting chamber 3 through a communication hole A5, and a code reel room 8 having a built-in code reel 7. A cord 7a is wound around the cord reel 7.

The electric blower 4 includes a rotary fan (not shown), and its front and rear portions are held by the cleaner main body 1 by support rubber 9 formed of an elastic material such as rubber. In addition, the cleaner body 1 includes the electric blower 4.
Exhaust gas discharged from the exhaust hole 10 provided in the cleaner body 1
An exhaust passage A11 leading to the front of the vehicle is provided. A hose 12, an extension pipe 13, a suction device 14 are provided at a front portion of the cleaner body 1.
Are provided detachably.

[0005] The hose 12 and the extension pipe 13 are provided with an intake passage 15 for sucking air into the cleaner body 1 and an electric blower 4.
Exhaust passage B16 for returning the exhaust gas to the suction device 14, the intake passage 15 communicates with the dust collection chamber 3 of the cleaner body 1, and the exhaust passage B16 communicates with the exhaust passage A11 of the cleaner body 1. Is in communication with In addition, the dust collection chamber 3 of the cleaner body 1
Are provided with cooling holes A17 communicating with the atmosphere. In the dust collecting chamber 3, the electric blower 4 also communicates with the suction side, and the inside of the dust collecting chamber 3 is maintained at a negative pressure. Although not explicitly shown in FIG. 7, in a state where the filter 2 is mounted in the dust collection chamber,
The intake passage 15 of the hose 12 and the intake port of the filter 2 are airtightly connected, so that air containing dust from the intake passage 15 of the hose 12 does not flow into the dust collection chamber 3 without passing through the filter 2. Therefore, when the electric blower 4 operates, the inside of the dust collection chamber 3 becomes a negative pressure, and accordingly, the filter 2 spreads inside the dust collection chamber 3, and a suction force acts on the intake passage 15 from the intake port of the filter 2, and the intake passage From 15, air containing dust passes through the filter 2, and then flows to the suction side of the electric blower 4 through a gap between the filter 2 and the inner wall of the dust collection chamber 3. Therefore, the intake passage 1 of the cleaner body 1
Reference numeral 5 denotes a passage extending to the dust collection chamber 3 and the suction side of the electric blower 4, and a space surrounded by a support rubber 9 provided in front of the electric blower 4 is also an intake passage.

The operation of the above configuration will be described. When the cord reel 7 is connected to a power supply, power is supplied to the electric blower 4 to start operation, and a rotating fan (not shown) rotates at high speed. As a result, an airflow to be sucked is generated, and dust is sucked together with the air from the suction tool 14 and guided into the dust collection chamber 3 through the extension pipe 13 and the suction passage 15 provided in the hose 12. The dust is captured by the filter 2 in the dust collection chamber 3, and the air is guided into the electric blower 4 from the communication hole A <b> 5 along the flow of the intake passage 15, and
Is cooled and discharged from the exhaust hole 10 of the electric blower 4. Further, the electric blower 4 is sufficiently cooled by sucking cold air (hereinafter, referred to as atmosphere) outside the cleaner body 1 taken in from the cooling holes A17 along the flow of the intake passage 15.

[0007] The exhaust gas is exhausted through an exhaust passage A in the cleaner body 1.
11 to the front of the cleaner body 1 and the hose 1
2. It is guided to the suction tool 14 through the exhaust passage B16 of the extension pipe 13. Further, the air is supplied to the intake passage 15 of the extension pipe 13.
Is sucked into the cleaner body 1 again through the hose 12. The dotted lines and arrows in the figure indicate the flow of air.

As described above, the air is circulated, and no exhaust air is emitted outside the cleaner body 1. Therefore, the air in the room is not polluted and the noise can be reduced. Cooling hole A1
By sucking the atmosphere from 7, the cooling of the fan motor was sufficiently performed, and a reduction in the life of the fan motor could be prevented.

[0009]

However, in the above-mentioned conventional structure, since the cooling hole A17 for taking in the air is kept open, the intake passage 1 of the hose 12 and the extension pipe 13 is not provided.
Thus, there is a problem that the amount of air sucked from the nozzle 5 decreases, and a sufficient amount of air does not flow into the suction device 14, and as a result, the dust removal property is deteriorated.

Further, since the code reel 7 cannot be cooled, there is a problem that the temperature of the code 7a becomes high and the life is shortened.

An object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a vacuum cleaner in which a sufficient amount of suction air is suctioned by a suction tool to prevent a reduction in dust removal.

[0012]

In order to solve the above-mentioned conventional problems, a vacuum cleaner according to the present invention comprises a vacuum cleaner body having an electric blower for generating a suction wind, and a suction for sucking dust on a surface to be cleaned. Tool, a suction passage communicating with the suction side of the electric blower, and an exhaust passage for returning at least a part of the exhaust gas discharged from the electric blower to the suction tool side in the vacuum cleaner main body. A cooling air passage for communicating the atmosphere with the intake passage, and air passage opening / closing means for opening and closing the cooling air passage in accordance with the temperature of exhaust air from the electric blower. When the temperature of the exhaust gas rises due to the rise in the temperature of the electric blower at the time of clogging of the filter, the cooling air path is opened to efficiently cool the electric blower, and the life of the electric blower due to thermal deterioration is reduced. Prevention It can be. Further, when the clogging of the filter is small, the cooling air passage is closed, and the amount of air to be sucked is not reduced.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 comprises a vacuum cleaner body having an electric blower for generating a suction wind, and a suction tool for sucking dust on a surface to be cleaned. Provides an intake passage communicating with the suction side of the electric blower, and an exhaust passage for returning at least a part of exhaust gas discharged from the electric blower to the suction implement side, and communicates the atmosphere with the intake passage. A cooling air path is provided,
According to the temperature of the exhaust air from the electric blower, by providing an air path opening and closing means for opening and closing the cooling air path, filters such as paper bags are clogged, when the exhaust temperature of the electric blower rises, Is detected, and the cooling air passage is opened to efficiently cool the electric blower, whereby a reduction in the life of the electric blower due to thermal deterioration can be prevented. Further, when the clogging of the filter is small, the cooling air passage is closed so that the amount of sucked air is not reduced.

According to a second aspect of the present invention, a shape memory alloy is used as the air path opening / closing means of the first aspect.
When the filter such as a paper bag is clogged and the exhaust temperature of the electric blower rises, this is detected, and the shape is stored in the shape that opens the cooling air passage to cool the electric blower, so that the heat of the electric blower is It is possible to prevent a reduction in life due to deterioration. In addition, when the clogging of the filter is small, the cooling air passage is closed so that the amount of sucked air is not reduced, and the amount of sucked air by the suction tool is sufficiently ensured to prevent a decrease in dust removal. The above operation can be made with a simple configuration.

According to a third aspect of the present invention, there is provided a cleaner main body having a built-in electric blower for generating a suction wind, and a suction device for sucking dust on a surface to be cleaned, wherein the electric blower is provided in the cleaner main body. An intake passage communicating with the suction side of the air blower, and an exhaust passage for recirculating at least a part of the exhaust gas discharged from the electric blower to the suction tool side, and a cooling air passage communicating the atmosphere with the intake passage. According to the provision of the air passage opening and closing means for opening and closing the cooling air passage according to the power consumption of the electric blower, when the filter is clogged and the power consumption of the electric blower falls below a predetermined value, Since the cooling air passage is opened in conjunction therewith to efficiently cool the electric blower, it is possible to prevent the life of the electric blower from being shortened due to thermal deterioration. In addition, when the clogging of the filter is small, the cooling air passage is closed, and the amount of air taken in is not reduced, and the amount of air taken in by the suction tool is sufficiently secured.

According to a fourth aspect of the present invention, there is provided a cleaner body having a built-in electric blower for generating a suction wind, and a suction device for sucking dust on a surface to be cleaned. A cooling air passage for providing an intake passage communicating with the suction side of the blower and an exhaust passage for returning at least a part of exhaust gas discharged from the electric blower to the suction tool side, and for communicating the atmosphere with the intake passage; Provided with air path opening / closing means for manually opening / closing the cooling air path from the outside of the cleaner main body, a filter such as a paper bag is clogged, and the temperature of the exhaust of the electric blower has increased. At this time, the cooling air passage is manually opened to efficiently cool the electric blower, so that the life of the electric blower can be prevented from being shortened due to thermal deterioration.

According to a fifth aspect of the present invention, the opening / closing means for manually opening / closing the cooling air passage from the outside of the cleaner main body includes:
By linking with the input switch of the electric blower, the cooling air path opens in conjunction with switching to the strong operation input that requires a strong suction force, so that the electric blower can be cooled efficiently and the heat of the electric blower The life can be prevented from being shortened due to deterioration. In addition, by switching the cooling air passage in conjunction with switching to a weak operation input with a weak suction force, the suction air amount is not reduced, and the suction air amount with the suction tool is sufficiently secured to remove dust. Drop can be prevented.

According to a sixth aspect of the present invention, there is provided a power supply unit storage chamber having a power supply unit therein, and the power supply unit storage room is provided in a cooling air passage. The power supply unit can be cooled by taking in the heat, and thermal deterioration due to heat generation of the power supply unit can be prevented.

According to a seventh aspect of the present invention, the control circuit for controlling the input of the electric blower is disposed near the cooling air path, so that the heat-generating components in the control circuit are taken in from the cooling air path communicating with the atmosphere. It is sufficiently cooled by cold air, and the cooling efficiency can be improved.

According to the eighth aspect of the present invention, since the air passage opening / closing valve is used as the air passage opening / closing means, a filter such as a paper bag is clogged with a simple structure, and the temperature of the electric blower increases.
Cooling air is supplied to the electric blower only when the input of the electric blower is reduced, so that the life of the electric blower due to thermal deterioration can be prevented from being shortened. Further, when the clogging of the filter is small, the cooling air passage is closed so that the amount of sucked air is not reduced.

According to the ninth aspect of the present invention, the air passage opening / closing valve is provided with a small hole, and the size of the small hole is adjusted so that the filter is less clogged and the air passage opening / closing valve is closed. Also, cooling air is flown to the electric blower from the small holes, and at the same time, the life can be prevented from being shortened due to thermal deterioration of the electric blower,
The amount of air taken in is not significantly reduced, and the amount of air taken in by the suction tool can be ensured as necessary and sufficient to prevent a reduction in dust removal.

According to a tenth aspect of the present invention, since the cooling air passage is provided substantially above the main body of the cleaner, the exhaust air discharged from the electric blower is naturally warm, so that the warm exhaust air rises upward. In addition, the atmosphere and warm exhaust air from the cooling holes led from the cooling air passage are easily mixed with each other, so that the electric blower can be efficiently cooled and the life of the electric blower due to thermal deterioration can be prevented from being shortened.

[0023]

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

(Embodiment 1) FIG. 1 is a sectional view of a main body of a vacuum cleaner according to a first embodiment of the present invention. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 1, a cooling hole B18 for communicating the atmosphere is provided in the electric blower chamber 6, and a support rubber 9 of the electric blower 4 has a space surrounded by the support rubber 9, that is, An air intake unit 19 that communicates with the electric blower chamber 6 is provided, and the air intake unit 19 is provided with an air passage opening / closing valve 21 that detects a change in exhaust gas temperature and opens and closes the cooling air passage A20.

The operation of the above configuration is as follows.
When electric power is supplied to the electric blower 4, the electric blower 4 starts operating, and a rotating fan (not shown) rotates at high speed. As a result, an airflow to be sucked is generated, and dust is sucked from the suction tool 14 together with the air.
The air is guided into the dust collection chamber 3 through an intake passage 15 provided in the dust collection chamber 2. Then, the dust is captured by the filter 2 in the dust collection chamber 3,
The air is guided into the electric blower 4 through the communication hole A5, cools the electric blower 4, and is discharged from the exhaust hole 10 of the electric blower 4.

The exhaust gas is guided to the front part of the cleaner body 1 through the exhaust passage A11 in the cleaner body 1, passes through the hose 12, the exhaust passage B16 of the extension pipe 13, and passes through the suction device 14.
It is led to. Further, the air is supplied to the intake passage 1 of the extension pipe 13.
5 is sucked into the cleaner body 1 again through the hose 12.

At this time, if the filter 2 such as a paper bag is clogged, the amount of air passing through the filter 2 decreases, and the exhaust temperature of the electric blower 4 increases. Then, the air passage opening / closing valve 21 opens due to the rise in the exhaust temperature of the electric blower 4 and the cooling hole B
Atmospheric air flows into the air inlet 19 from the cooling air path A
Thus, the electric blower 4 can be efficiently cooled to prevent the life of the electric blower 4 from being shortened due to thermal deterioration. Further, when the clogging of the filter is small, the air passage opening / closing valve 21 is closed, and the suction air amount is not reduced. .

When a shape memory alloy is used for the air passage opening / closing valve 21, the filter 2 such as a paper bag is clogged, and when the exhaust temperature of the electric blower 1 rises, the cooling air passage A20 is opened. By storing the information, the electric blower 4
Can be cooled, and a reduction in the life of the electric blower 4 due to thermal deterioration can be prevented.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. 1, similarly to the first embodiment.

In the figure, a cooling hole B18 communicating the electric blower chamber 6 with the atmosphere, an intake introduction section 19 communicating the electric blower chamber 6 with the intake passage 15 are provided, and the power consumption of the electric blower 4 varies in the intake introduction section 19. And an air passage opening / closing valve 21 for opening and closing the cooling air passage A20.

The operation of the above configuration is as follows.
When the filter 2 such as a paper bag is clogged and the power consumption of the electric blower 4 is reduced, the air path opening / closing valve 21 is opened and the cooling hole B18 is opened.
From the air flows into the air inlet section 19 and the cooling air path A2
Since 0 is formed and the electric blower 4 is efficiently cooled,
It is possible to prevent the life of the electric blower 4 from being shortened due to thermal deterioration. When the clogging of the filter 2 is small, the air passage opening / closing valve 2
1 is closed, does not decrease the air volume of suction,
4 to ensure a sufficient amount of suction air to prevent a reduction in dust removal.

(Embodiment 3) FIG. 2 is a sectional view of a main body of a vacuum cleaner according to a third embodiment of the present invention. In addition,
The same components as those in the first embodiment are denoted by the same reference numerals,
The description is omitted.

In the drawing, a cooling hole C24 for communicating the atmosphere is provided in the electric blower room 6, and the support rubber 9 of the electric blower 4 has a space surrounded by the support rubber 9, that is, the intake passage 15 and the electric blower room 6 Intake section 19 that communicates
And air passage opening / closing means 26 for opening / closing the cooling air passage B 25 by manually operating the outside of the vacuum cleaner main body 1 in the air inlet section 19.

The operation of the above configuration is as follows.
The cooling air passage B25 is manually opened in response to a decrease in the suction force when the filter 2 is clogged, and the cooling air passage B25 is opened to efficiently cool the electric blower 4, so that a reduction in the life of the electric blower 4 due to thermal deterioration can be prevented. Further, when the clogging of the filter 2 is small, the cooling air passage B25 is closed so that the suction air amount is not reduced, and the suction air amount in the suction tool 14 is sufficiently secured to prevent a decrease in dust removal performance. it can.

The air passage opening / closing means 26, which is manually operated to open and close the cooling air passage B25, operates in conjunction with an input changeover switch 27 of the electric blower 4 to provide a strong operation input requiring a strong suction force. By opening the cooling air path B25 in conjunction with the switching, the electric blower 4 can be cooled efficiently, and the life of the electric blower 4 due to thermal deterioration can be prevented from being shortened. Further, by switching the cooling air passage B25 in conjunction with switching to the weak operation input with a weak suction force, the suction air amount in the suction tool 14 is sufficiently secured without reducing the suction air amount, and dust is removed. Can be prevented from decreasing.

(Embodiment 4) FIG. 3 is a sectional view of a vacuum cleaner main body of a vacuum cleaner according to a third embodiment of the present invention. In addition,
The same components as those in the first embodiment are denoted by the same reference numerals,
The description is omitted.

In the figure, a cord 7a as a power supply unit
Is provided with a communication hole B22 for connecting the cord reel chamber 8, which is a power supply unit storage chamber in which the code reel 7 wound with is wound, to the electric blower chamber 6, and a cord outlet 23 as a cooling hole for communicating with the atmosphere. Used.

The operation of the above configuration is as follows.
Communication hole B for communicating between the cord reel chamber 8 and the electric blower chamber 6
22 is provided to take in the atmosphere from the cord outlet 23 so that the cord 7a can be cooled.
Thermal deterioration due to heat generation of the cord 7a can be prevented.

(Embodiment 5) FIG. 4 is a sectional view of a cleaner body of a vacuum cleaner according to a fifth embodiment of the present invention, and FIG. 5 is a sectional view of another cleaner body of the same vacuum cleaner. It is. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the control circuit 28 for controlling the input of the electric blower 4 is disposed near the cooling hole D29, so that the heat-generating components in the control circuit 28 are connected to the cooling hole 29 communicating with the atmosphere. The cooling is sufficiently performed by the taken-in cold air 30, and the cooling efficiency can be improved.

As shown in FIG. 5, by disposing the control circuit 28 in the vicinity of the communication hole B22, the heat-generating components in the control circuit 28 are connected to the communication hole B22 which communicates with the atmosphere via the code reel chamber 8. It is cooled by the air taken in, and the cooling efficiency can be improved.

(Embodiment 6) FIG. 6 is a sectional view of an air passage opening / closing valve of a vacuum cleaner according to a sixth embodiment of the present invention. In addition,
The same components as those in the first embodiment are denoted by the same reference numerals,
The description is omitted.

As shown in FIG. 6, small holes 3
By providing 1, by adjusting the size of the small hole 31, even when the filter 2 is less clogged and the air path opening / closing valve 21 is closed, the cooling air is flown from the small hole 31 to the electric blower 4, It is possible to prevent a reduction in the life and thermal deterioration of the electric blower 4, and at the same time, not to significantly reduce the amount of sucked air, and to secure a sufficient and sufficient amount of sucked air in the suction device 14 to prevent a decrease in dust removal performance. .

(Embodiment 7) Next, a seventh embodiment of the present invention will be described with reference to FIG. The same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.

By providing the suction inlet 19 substantially above the vacuum cleaner main body 1, the flow 20 of the cooling air path is formed substantially above the vacuum cleaner main body 1 and discharged from the electric blower 4. Since the exhaust gas is naturally warm, the warm exhaust gas rises upward, the atmosphere guided from the cooling air passage 15 and the warm exhaust gas are easily mixed, and the electric blower 4 can be efficiently cooled and the electric blower 4 is deteriorated by heat. The life can be prevented from being shortened.

As described in the above embodiment, if the electric blower of the present invention is used for a vacuum cleaner, a highly reliable vacuum cleaner can be obtained.

[0048]

As described above, according to the present invention, the amount of air taken in by the suction device is sufficiently ensured to prevent a reduction in dust removal performance, and the cooling of the electric blower even if the filter is clogged. And a reduction in life due to thermal deterioration can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vacuum cleaner main body of a vacuum cleaner showing first, second, and seventh embodiments of the present invention.

FIG. 2 is a cross-sectional view of a vacuum cleaner main body of a vacuum cleaner according to a third embodiment of the present invention.

FIG. 3 is a sectional view of a vacuum cleaner main body of a vacuum cleaner showing a fourth embodiment of the present invention.

FIG. 4 is a sectional view of a vacuum cleaner main body of a vacuum cleaner showing a fifth embodiment of the present invention.

FIG. 5 is a sectional view of another vacuum cleaner main body of the vacuum cleaner.

FIG. 6 is a sectional view of an air passage opening / closing valve of a vacuum cleaner according to a sixth embodiment of the present invention.

FIG. 7 is a sectional view of a vacuum cleaner main body of a conventional vacuum cleaner.

FIG. 8 is a partial sectional view of the electric vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 3 Dust collection room 4 Electric blower 5 Communication hole A (Communication hole) 6 Electric blower room 7 Code reel 8 Code reel room 11 Exhaust passage A (Exhaust passage) 15 Intake passage 18 Cooling hole B (Cooling hole) 19 Intake air inlet 20 cooling air path A (cooling air path) 21 air path opening / closing valve (air path opening / closing means) 24 cooling hole C (cooling hole) 25 cooling air path B (cooling air path) 26 air path opening / closing means 27 input switching Switch 28 control circuit 29 cooling hole D (cooling hole) 31 small hole

Continued on the front page (72) Inventor Masafumi Okushima 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3B006 AA08

Claims (10)

[Claims] 1. An electric vacuum cleaner having an electric blower for generating a suction wind, and a suction device for sucking dust on a surface to be cleaned, wherein the electric cleaner is connected to a suction side of the electric blower. An intake passage, and an exhaust passage for recirculating at least a part of the exhaust gas discharged from the electric blower to the suction device side, and a cooling air passage communicating the atmosphere with the intake passage. A vacuum cleaner comprising an air path opening / closing means for opening and closing the cooling air path in accordance with the temperature of the exhaust gas. 2. The vacuum cleaner according to claim 1, wherein a shape memory alloy is used as the air passage opening / closing means. 3. A cleaner body having a built-in electric blower for generating a suction wind, and a suction device for sucking dust on a surface to be cleaned, wherein the cleaner body communicates with a suction side of the electric blower. An intake passage, and an exhaust passage for returning at least a part of the exhaust gas discharged from the electric blower to the suction tool side, and a cooling air passage for communicating the atmosphere with the intake passage. An electric vacuum cleaner comprising an air path opening / closing means for opening / closing the cooling air path in response to a change in electric power. 4. A cleaner main body having a built-in electric blower for generating a suction wind, and a suction device for sucking dust on a surface to be cleaned, wherein the cleaner main body communicates with a suction side of the electric blower. An intake passage, an exhaust passage for recirculating at least a part of exhaust gas discharged from the electric blower to the suction tool side, and a cooling air passage for communicating the atmosphere with the intake passage. An electric vacuum cleaner having an air passage opening / closing means for manually opening / closing the cooling air passage from outside. 5. The vacuum cleaner according to claim 4, wherein the air path opening / closing means is configured to interlock with an input switch of the electric blower. 6. The electric vacuum cleaner according to claim 1, further comprising a power supply unit storage chamber containing a power supply unit, wherein the power supply unit storage room is provided in a cooling air passage. . 7. The electric vacuum cleaner according to claim 1, wherein a control circuit for controlling an input of the electric blower is disposed near the cooling air passage. 8. The vacuum cleaner according to claim 1, wherein the air passage opening / closing means is an air passage opening / closing valve. 9. The vacuum cleaner according to claim 8, wherein a small hole is provided in the air passage opening / closing valve. 10. The vacuum cleaner according to claim 1, wherein the cooling air passage is provided substantially above the cleaner body.