JPH06327589A - Vacuum cleaner floatable on exhaust pressure - Google Patents

Abstract

PURPOSE:To prevent the dispersion of dust due to the exhaust pressure of an electrical blower as much as possible around the body of a vacuum cleaner, regarding a vacuum cleaner of such type as floatble on exhaust pressure. CONSTITUTION:The first and second double skirts 39 and 41 are attached to the external bottom of a vacuum cleaner body 21 where an exhaust discharge port 31 is formed. Also, annular space 42 between the skits 39 and 41 communicated with an exhaust port 38 at the upper section of the body 21. On the other hand, the first skirt 39 is fitted with a body 43 of sleigh type in profile and air vent hole 44 is formed on the bottom piece 45 thereof. According to this construction, an exhaust flow passing a gap (g) formed between the piece 45 and a floor C upon the floating of the body 21, is introduced from the hole 44 to the annular space 42 for discharge through the exhaust port 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pressure levitation type electric vacuum cleaner in which a vacuum cleaner body is floated by an exhaust pressure generated during operation to reduce movement resistance.

[0002]

2. Description of the Related Art FIG. 7 shows a general canister type vacuum cleaner. In this figure, reference numeral 1 is a cleaner body, and an electric blower 3 is installed behind the dust collection chamber 2. Reference numeral 4 denotes a partition wall that partitions the dust collection chamber 2 and the electric blower 3 and is provided with a large number of ventilation holes 4a.

The dust collection chamber 2 is provided with an insertion port 5 for a connection hose H, and the insertion port 5 has a dust collection bag 6 made of paper having air permeability.
Is set. Then, when the electric blower 3 is activated,
Due to the suction force, dust in the air is collected in the dust collecting bag 6 through the connection hose H, and after passing through the electric blower 3, from the exhaust port 7 provided on the rear wall of the main body to the rear of the cleaner main body 1. It is designed to be exhausted. In the figure, the arrow indicates the exhaust direction.

A pair of left and right wheels 8 as a moving means are attached to the rear portion of the cleaner body 1 so as to project downward from the outer bottom surface of the body, and a steering roller 9 is provided at the center of the front portion. It is provided so that when the machine body is towed, the cleaner body 1 can be moved by the wheels 8 and the steering rollers 9. Reference numeral 10 is a handle for carrying the machine.

By the way, in the conventional vacuum cleaner configured as described above, the wheel body 8 and the small diameter steering roller 9 roll on the floor surface during towing, thereby moving the cleaner body 1. However, for example, when a carpet is laid on the floor, the movement resistance of the wheels 8 and the steering rollers 9 becomes large, which causes a problem that the operation of moving the machine body is hindered. It was

As a solution to such a problem, conventionally, the exhaust pressure of the electric blower is used to levitate the cleaner body, thereby reducing the movement resistance when the cleaner body is towed, so-called. Various vacuum cleaners of the exhaust pressure floating type have been proposed.

[0007] As an example, by forming an exhaust outlet on the bottom wall of the cleaner body, and by mounting a skirt around the outer bottom of the cleaner body so as to surround the exhaust outlet, the floor surface becomes The exhaust pressure chamber is configured by the space surrounded by the skirt between the bottom walls, and the air blown from the discharge port increases the pressure resistance in the exhaust pressure chamber so that the airframe is levitated. Are known. As an improvement of this conventional example, a skirt formed of a soft material is also proposed.

As a second prior art, for example, as disclosed in Japanese Utility Model Publication No. 55-9866, an annular brush is provided so as to surround an exhaust outlet provided on the bottom wall of the cleaner body. The one provided is known. Also in this case, the structure for levitating the machine body is the same as the above-mentioned conventional example in principle, and the pressure resistance between the brush and the floor surface causes the cleaner body to levitate from the floor surface to improve the traveling property. .

Further, as a third prior art, Japanese Patent Publication No.
There is one disclosed in Japanese Patent Laid-Open No. 5-11336. In this prior art, an annular protrusion is provided around the lower surface of the cleaner main body, and wheels are provided inside the protrusion so that the wheels can freely move in and out, and when the wheels are projected from the protrusion, the exhaust air from the electric blower is exhausted from the cleaner main body. Is discharged from above, and when the wheels are retracted into the protrusion, the exhaust is blown out from the lower part of the cleaner body toward the floor surface, and the body pressure is raised by the exhaust pressure.

[0010]

By the way, in the case where the exhaust outlet is surrounded by only a single skirt as in the first conventional example, a narrow space generated between the skirt and the floor surface when the machine body is floated up. When the exhaust flow flows out through such a gap, the flow velocity of the exhaust rapidly increases, and the dust existing around the main body of the cleaner is scattered.

Even if the skirt is made of a soft material, such a dust scattering phenomenon similarly occurs as the exhaust pressure of the exhaust pressure chamber formed in the skirt increases during use. The second prior art using a brush instead of the skirt, or the third prior art using an annular protrusion.
It can occur similarly in the prior art of.

FIG. 8 shows a double skirt provided in order to improve such inconvenience. In the exhaust pressure floating type electric vacuum cleaner shown in this figure, an exhaust gas discharge port 12 is formed in a bottom wall 11 of a cleaner body 1, and an electric blower is provided downward from this exhaust gas discharge port 12 toward the floor surface. The exhaust flow of 3 is designed to blow out. On the other hand, annular skirts 13 and 14 are doubly attached to the outer bottom of the cleaner body 1 so as to surround the exhaust outlet 12.

Each of these skirts 13 and 14 is formed to have an arcuate shape in which the cross section is curved inward, and the second skirt 14 on the outer peripheral side is formed longer than the first skirt 13 on the inner peripheral side. Then, even when the lower end of the first skirt 13 is not in contact with the floor surface, the lower end of the second skirt 14 is always in contact with the floor surface. Further, a plurality of exhaust inflow ports 15 are bored in the bottom wall 11 along the first and second skirts 13 and 14, and the exhaust inflow ports 15 are formed in the cleaner body 1. It communicates with the exhaust port 7 through the passage 16.

In the above structure, the air blown from the discharge port 12 raises the pressure resistance generated in the exhaust pressure chamber 17 constituted by the space surrounded by the first skirt 13 between the floor surface C and the bottom wall 11. Let the airframe levitate. Due to the floating of the machine body, the wheels 8 and the steering rollers 9 are separated from the floor surface C, and the machine body is in a state in which it can be easily traveled by a slight traction force.

When the airframe further rises and a gap G is created between the first skirt 13 and the floor surface C, the air in the exhaust pressure chamber 17 enters the annular space 18 between the first and second skirts 13, 14. Further, it is discharged to the outside from the exhaust port 7 through the exhaust inlet port 15 and the exhaust passage 16, and the flying height of the machine body is maintained at a proper level. Also, when the first skirt 13 rises, the second
Since the skirt 14 is in contact with the floor surface C, the dust in the exhaust pressure chamber 17 can be captured by the second skirt 14, and the dust can be prevented from scattering to the outside.

However, in the conventional skirt having the double structure as described above, the exhaust flow flowing out from the gap G between the first skirt 13 and the floor C directly leaks to the periphery of the cleaner body 1. The second skirt 14 is only used to prevent this, and although some dust scattering prevention effect is recognized as compared with the above-mentioned respective prior arts, when the flow velocity of the exhaust flow is extremely high, Skirt 1
The exhaust flow also leaks from 4, and dust around the cleaner body is scattered to some extent.

In particular, in recent years, the output of the electric vacuum cleaner has been increased, and the speed of the exhaust gas flow tends to further increase accordingly. Therefore, the above-described improvement example cannot cope with the actual situation. Is coming.

Further, in the conventional exhaust pressure levitation type vacuum cleaner, when trying to get over a step which obstructs running, such as an article left on a sill or a floor, a skirt,
Since a structure such as a brush or a protrusion that is used for levitation of the fuselage is provided so as to surround the wheels, the problem that the wheels come into contact with the step before the wheels during traveling and hinder the traveling There was a point.

The present invention has been made in view of the above problems, and in an exhaust pressure levitation type electric vacuum cleaner, it is possible to prevent dust around the main body of the cleaner from scattering due to the exhaust pressure of the electric blower as much as possible. The first purpose is to smoothly overcome the step on the floor surface and the second purpose.

[0020]

SUMMARY OF THE INVENTION According to the present invention, an exhaust outlet for blowing out an exhaust flow of an electric blower built in a main body of a cleaner is formed on a bottom wall of the main body of the cleaner, and the exhaust is provided on an outer bottom portion of the main body of the cleaner. An annular first skirt is attached so as to surround the discharge port, and an annular second skirt is provided so as to surround the first skirt.
A skirt is attached, and a lower end peripheral edge of the second skirt is configured to be located below a lower end portion of the first skirt, and further communicates with an annular space formed between the first and second skirts. It is intended for an exhaust pressure levitation type electric vacuum cleaner in which an exhaust port is provided above the main body of the vacuum cleaner.

In order to achieve the first object, according to the present invention, the lower end portion of the first skirt is formed of a resinous annular sled body, and the bottom surface piece of the sled body is provided with a thickness thereof. Ventilation holes that penetrate in the vertical direction are formed.

The bottom piece of the annular sled preferably has a flat portion on the inner peripheral side of the portion where the ventilation hole is formed, which has the same height as the lower end opening surface of the ventilation hole or projects downward from the opening surface. In addition, a flat surface portion or a protrusion portion is provided on the outer peripheral side of the ventilation hole forming portion at the same height as the lower end opening surface of the ventilation hole or protruding below the opening surface. In this case, the protrusion may be formed integrally with the bottom piece, or a tube or a brush which is a separate member may be integrally attached to the bottom piece.

Further, the annular sled body may have a bottom piece extended to form an extension plane portion continuous with the first and second skirts, and a ventilation hole may be formed in the extension plane portion. .

Further, in the present invention, in addition to the above configuration, a second
An annular third skirt may be attached to the outside of the skirt so as to surround the second skirt, and the lower end of the third skirt may be located below the lower end of the second skirt.

In order to achieve the above-mentioned second object, in the exhaust pressure floating type electric vacuum cleaner of the present invention, the exhaust outlet is provided on the bottom wall of the cleaner body, and the exhaust is provided on the outer bottom portion of the cleaner body. A plurality of annular skirts surrounding the discharge port are arranged at intervals, and the lower end of the outer skirt is located below the lower end of the inner skirt. In the above, the step-over riding wheel that can be displaced in the vertical direction is provided in the cleaner main body portion that is further forward than the front end portion of the outermost skirt.

[0026]

According to the technical means for achieving the first object, the exhaust flow generated by the electric blower is discharged from the exhaust discharge port toward the floor surface, and the floor surface and the outer bottom portion of the cleaner main body. The exhaust pressure of the exhaust pressure chamber formed by the space surrounded by the first skirt between the two rises. This allows
When the cleaner body floats, a blowing gap is created between the sled bottom piece of the first skirt and the floor surface. In this state, part of the exhaust flow passing through the sled bottom piece is Due to the pressure difference between the atmospheric pressure in the gap and the atmospheric pressure generated in the ventilation hole, the gas is discharged upward from the ventilation hole.

On the other hand, since the lower edge of the second skirt is in full contact with the floor surface, the exhaust flow leaking from the gap is captured by the second skirt and merges with the exhaust flow from the ventilation hole. It is discharged to the outside through an exhaust port provided on the top of the cleaner body. As a result, the exhaust pressure for levitating the cleaner body is properly maintained, and dust and the like around the cleaner body are prevented from being scattered.

In this case, if the bottom piece of the sled body has the above-mentioned flat surface portion or the projection portion inside and outside the area where the ventilation hole is formed, the space between the floor surface and the bottom piece and the inside of the ventilation hole The pressure difference becomes even larger, and the exhaust flow that has entered the gap between the floor surface and the bottom piece can be guided to the ventilation holes as much as possible, and the exhaust speed that blows out from the second skirt further decreases.

If the first and second skirts are connected to each other by a bottom piece of a sled body and ventilation holes are formed in the extension plane part of the bottom piece that constitutes the connecting portion, the flat surface of the bottom piece. The area of the part becomes large, and the exhaust pressure in the first skirt becomes stable. Further, since the exhaust pressure difference between the extended flat portion and the ventilation hole increases, the amount of exhaust gas passing through the ventilation hole increases.

Further, when the third skirt is provided, a part of the exhaust flow leaking from the second skirt is captured by the third skirt, and the exhaust flow flowing out around the cleaner body is further reduced.

According to the technical means for achieving the second object, when there is a step such as a sill or an obstacle in front of the machine body in the traveling direction, the step-passing wheel comes into contact with the step first,
The wheel is displaced in position and rolls along the step, and the skirt on the outermost periphery does not come into contact with the step during that time, so that it is easy to get over the step.

[0032]

1 and 2 show a first embodiment of an exhaust pressure floating type vacuum cleaner according to the present invention. In these drawings, reference numeral 21 denotes a cleaner body, and a dust collecting chamber 22 is provided inside.
And an electric blower chamber 24 in which the electric blower 23 is installed are formed in the front and rear through a partition wall 25, and the dust collecting chamber 22 and the electric blower chamber 24 are formed in the partition wall 25. It communicates through a large number of ventilation holes 25a. Two
Reference numerals 6 and 27 denote cushioning rubbers that hold the electric blower 23.

The dust collection chamber 22 has an insertion port 28 for the connection hose H.
Is provided, and a paper dust bag 29 having air permeability is set in the insertion port 28. Further, the electric blower chamber 24 has an exhaust outlet 31 formed through the bottom wall 30 of the cleaner body 21.

Then, when the electric blower 23 is activated, dust is collected by the suction force through the connection hose H into the dust collecting bag 29.
Collected in. On the other hand, the exhaust gas generated by the suction force is
The exhaust gas passes through the ventilation hole 25a of the partition wall 25, the electric blower chamber 24, and the exhaust passage E toward the exhaust outlet 31, and is further exhausted downward from the exhaust outlet 31 toward the floor surface C.

A pair of left and right traveling wheels 32 are arranged at the rear of the cleaner body 21 so as to project downward from the outer bottom of the cleaner body, and a steering roller 33 is provided at the center of the front part. The cleaner body 21 can be moved by the traveling wheels 32 and the steering rollers 33 when the machine body is towed. Reference numeral 34 is a handle for carrying the machine body.

An exhaust chamber 3 having a lower end opened between the rear wall 35 of the cleaner body 21 and the rear partition wall 36 of the electric blower chamber 24.
7 is formed, and an exhaust port 38 formed of a large number of small holes is formed through the rear wall 35.

Reference numeral 39 denotes an annular first skirt mounted on the outer surface of the bottom wall 30. The first skirt 39 is mounted so as to surround the exhaust outlet 31, the traveling wheel 32, and the steering roller 33. When the electric vacuum cleaner is used, the first skirt 39, the bottom wall 30, and the floor surface C are The space surrounded by the above functions as the exhaust pressure chamber 40.

Reference numeral 41 denotes a second skirt, which is arranged so as to circulate from the outer peripheral portion of the cleaner main body bottom wall 30 to the cleaner main body rear wall 35 and surround the first skirt 39. Therefore, an annular space 42 communicating with the exhaust chamber 37 is formed between the first and second skirts 39 and 41. The second skirt 41 is formed to be longer than the first skirt 39, so that the lower end periphery of the second skirt 41 is located below the lower end of the first skirt 39.

In such a structure, the electric blower 2
The exhaust flow generated in 3 is discharged from the exhaust discharge port 31 toward the floor surface C, the exhaust pressure of the exhaust pressure chamber 40 formed in the first skirt 39 rises, and its pressure resistance becomes a constant value. When it exceeds the limit, the cleaner main body 21 floats, and good machine running performance is obtained.

In the exhaust pressure floating type vacuum cleaner having the above-mentioned basic structure, the first skirt 39 is used in this embodiment.
The lower end of the sled body 43 is formed of a resin-molded annular sled body 43, and the sled body 43 is provided with a plurality of ventilation holes 44.

The sled body 43 is formed by integrally molding a flat plate-shaped bottom piece 45 formed in a deformed annular shape, and a mounting rib 46 rising vertically along the substantial center line of the bottom piece 45. The attachment ribs 46 are fixed to the lower end of the annular body 47 that forms the upper half of the first skirt 39, thereby forming the lower half of the first skirt 39.

The bottom piece 45 is provided with a flat surface portion 45a which is substantially parallel to the horizontal floor surface C, and outwardly extending inclined peripheral wall portions 45b and 45c are extended from inner and outer peripheral edges of the flat surface portion 45a. The flat surface portion 45a realizes stabilization of exhaust pressure, which will be described later. Further, the ventilation hole 44 is formed in the shape of an elongated hole penetrating in the thickness direction of the flat surface portion 45a on the outer peripheral side of the mounting rib 46 of the bottom flat surface portion 45a, and as shown in FIG. They are arranged at substantially equal intervals over the entire circumference of 45a.

In this way, the sled body 43 is attached to the first skirt 39.
In the case of a machine equipped with a
When 1 floats, a blowing gap g of about an air film is formed between the sled body 43 provided at the lower end portion of the first skirt 39 and the floor surface C, and a part of the exhaust flow flows from the gap g. As indicated by the dashed arrow 1 in FIG. The gap g generated when the cleaner body 21 floats is balanced by the weight of the machine body, the exhaust amount of the electric blower 23, and the exhaust pressure, and the stability is also achieved by the width dimension of the flat surface portion 45a of the sled body bottom piece 45. To be affected.

Most of the exhaust flow discharged from the gap g is indicated by the solid line in FIG. 1 due to the pressure difference between the atmospheric pressure inside the ventilation hole 44 and the atmospheric pressure in the gap g along the flat surface portion 45a inside and outside the ventilation hole 44. As shown by the arrow, while flowing through the ventilation hole 44 to the annular space 42 and further raising the exhaust chamber 37,
It is discharged to the outside through the exhaust port 38.

As described above, most of the exhaust flow goes upward through the ventilation holes 44, so that the flow rate of exhaust flowing from the gap g along the floor surface C is significantly reduced as compared with the conventional case. Therefore, since the velocity of the exhaust gas flowing out from the slight gap formed between the second skirt 41 and the floor surface C is also small, the scattering of dust around the cleaner body 21 can be prevented as much as possible.

FIG. 3 shows a second embodiment of the exhaust pressure floating type vacuum cleaner according to the present invention. In the figure, parts having the same constructions and operations as those of the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the first
The bottom piece 45 of the sled body 43 provided at the lower end of the skirt 39 is configured as follows.

That is, the flat portion 45a of the bottom piece 45 is formed at the same height inside and outside the ventilation hole 44 as in the first embodiment, but the outer periphery of the flat portion 45a is the same. The difference lies in that the tube 48 as a projection is attached so as to protrude downward from the lower end opening surface of the ventilation hole 44 over the entire circumference.

In this state, the tube 48 is attached to the flat portion 4 of the bottom piece 45 of the sled body.
The gap g between 5a and the floor surface C becomes narrow due to the presence of the tube 48, so that the air pressure in the ventilation hole 44 and the ventilation hole 44
The pressure difference from the atmospheric pressure in the gap g along the flat surface portion 45a extending inside and outside increases. Therefore, the flow rate of the exhaust gas flowing toward the ventilation hole 44 is increased, and the effect of preventing the exhaust flow from flowing out of the second skirt 41 is further increased as compared with the first embodiment.

Although the tube 48 is used as the protrusion in this embodiment, a brush may be used. The point is that the ventilation holes 44 are provided on the inner peripheral side of the formation position of the ventilation holes 44.
The same height as the lower end opening surface of or of the flat surface projecting downward than the opening surface is provided, and the same height as the lower end opening surface of the ventilation holes 44 or Also, by providing the flat surface portion or the projection portion that protrudes downward, it becomes possible to more effectively direct the exhaust flow to the ventilation hole 44 as described above.

FIG. 4 shows a third embodiment of the exhaust pressure floating type vacuum cleaner according to the present invention. In the figure, the same reference numerals are given to portions having the same configurations and operations as those of the above-described respective embodiments, and the description thereof will be omitted. In this embodiment, the bottom piece 4 of the sled body 43 provided at the lower end of the first skirt 39.
5 is extended to form an extension plane portion 49 continuous with the first and second skirts 39 and 41, and a ventilation hole 44 is formed in the extension plane portion 49. In addition, this ventilation hole 4
A plurality of 4 are provided on the extended flat surface portion 49 which is on the outer periphery of the mounting rib 46 of the sled body 43.

In this manner, the lower end surface of the first skirt 39 and the vicinity of the lower end portion of the second skirt 41 are connected all around by the bottom surface piece 45 of the sled body 43 having the extended flat portion 49. The area of the flat surface portion 45a of the bottom surface piece 45 is increased, and the exhaust pressure in the first skirt 39 is stabilized. Further, since the exhaust pressure difference between the extended flat portion 49 and the ventilation hole 44 becomes large, it is possible to obtain substantially the same effect as that of the second embodiment, such as the amount of exhaust gas passing through the ventilation hole becomes large.

FIG. 5 shows a fourth embodiment of the exhaust pressure floating type vacuum cleaner according to the present invention. In the figure, the same reference numerals are given to portions having the same configurations and operations as those of the above-described respective embodiments, and the description thereof will be omitted. In this embodiment, an annular third skirt 50 is attached to the outside of the second skirt 41 so as to surround the second skirt 41, and the lower end of the third skirt 50 is lower than the lower end of the second skirt 41. It is configured to be located at.

As described above, the first and second skirts 39 and 41
By further providing the third skirt 50 on top of the above, it is possible to capture again the exhaust flow that has flowed out from the gap between the second skirt 41 and the floor surface C. Therefore, the cleaner body accompanying the outflow of the exhaust flow It is possible to further thoroughly prevent the scattering of the surrounding dust. Reference numeral 51 is a second annular space formed between the second skirt 41 and the third skirt 50, and 30a is a bottom wall extension portion that partitions the annular space 42 and the second annular space 51 from the exhaust chamber 37. Through holes 52, 53 that connect the annular spaces 42, 51 and the exhaust chamber 37 to the bottom wall extension 30a.
Are formed.

FIG. 6 shows a fifth embodiment of the exhaust pressure floating type vacuum cleaner according to the present invention. In the figure, the same reference numerals are given to portions having the same configurations and operations as those of the above-described respective embodiments, and the description thereof will be omitted. In the present embodiment, the step-over riding wheel capable of being vertically displaced in the vicinity of the cleaner main body portion further to the front side than the front end portion of the second skirt 41, specifically, the insertion port 28 of the connection hose H. 54 is provided.

This step-riding wheel 54 is used for the cleaner main body 21.
Is attached to the free end of a rotating arm 55 that is rotatably pivoted near the insertion port of the cleaner, and is compressed by a compression spring 56 stretched between the rotating arm 55 and the front end of the cleaner body 21. The wheels 54 are constantly urged in a direction away from the floor surface C.

When the electric vacuum cleaner is in the non-energized state, the rotating arm 55 has the wheel 54 positioned away from the floor surface C by the urging force of the compression spring 56, and is indicated by a broken line in FIG. As shown in the figure, it is configured so that it can be rotated on a circular orbit having a radius of the length of the rotating arm 55 to a position where it stands up substantially vertically against the biasing force of the compression spring 56.

According to this structure, when there is a step F such as a sill or an obstacle on the floor surface C in the forward direction of the machine body, the step-over wheel 54 can be operated by turning off the power of the vacuum cleaner. The pivot arm 55 is pivotally displaced in a direction away from the floor surface C. As a result, the wheel 54 moves up to a height that easily reaches the upper surface of the step F, and the wheel 54 at the upper moving position is located further forward than the front end of the cleaner main body 21. 21, the step F is contacted before the second skirt 41.

When the wheel 54 rides on the step F, the rotating arm 55 is pushed backward and downward as the machine body advances, and the wheel 54 is finally moved to the first and second skirts 39, 41. Since it is located below the lower end of the floor, the step F on the floor surface C can be smoothly overcome. Even if the step-riding wheel 54 can move vertically only vertically, the function of getting over the step F can be achieved.

[0059]

As described above, according to the first structure of the present invention, the lower end portion of the first skirt is constituted by the annular sled body made of resin, and the bottom piece of the sled body is further provided with Since the ventilation hole that penetrates in the thickness direction is formed, the cleaner body floats up due to the exhaust flow discharged from the exhaust discharge port toward the floor surface, and the bottom piece of the sled body of the first skirt and the floor. In the gap generated between the surfaces, most of the exhaust flow is discharged upward from the ventilation hole due to the pressure difference between the air pressure in the portion along the bottom piece and the atmospheric pressure in the ventilation hole.

Therefore, since the flow rate of the exhaust gas flowing out from the second skirt along the floor surface can be suppressed and the exhaust gas amount can be reduced, the scattering of dust around the cleaner body can be prevented as much as possible. it can.

According to the second aspect, since the bottom piece of the sled body has the above-mentioned flat surface portion or the projection portion inside and outside the portion where the ventilation hole is formed, the gap between the floor surface and the bottom piece, The pressure difference between the inside of the ventilation hole is further increased, and the exhaust flow that has entered the gap between the floor surface and the bottom piece can be guided to the ventilation hole as much as possible, further reducing the exhaust speed blown out from the second skirt. You can

According to the third aspect, since the first and second skirts are connected by the bottom piece of the sled body, and the ventilation plane is formed in the extension plane portion of the bottom piece which constitutes the connecting portion, By making the flat surface area of the bottom piece large, the exhaust pressure in the first skirt can be stabilized. Further, since the exhaust pressure difference between the extended flat portion and the ventilation hole becomes large, the exhaust flow can be discharged from the ventilation hole without flowing out to the surroundings.

According to the fourth aspect, since the annular third skirt is attached to the outside of the second skirt so as to surround the second skirt, a part of the exhaust flow leaking from the second skirt is removed to the first side. The three skirts can be captured, and the exhaust flow flowing out around the cleaner body can be further reduced.

According to the second structure of the present invention, since the stepping wheel which can be displaced in the vertical direction is provided at the bottom of the main body of the cleaner, which is further forward than the front end of the outermost skirt, the bottom is provided. If there is a step such as a sill or an obstacle in the front of the aircraft in the traveling direction, the step-over wheel comes into contact with the step first,
The wheel is displaced in position and rolls along the step, and the skirt on the outermost periphery does not come into contact with the step during that time. Therefore, it is easy to climb over the step, and the exhaust pressure levitation type electric vacuum cleaner has been difficult to achieve in the past. The operability of can be greatly improved.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of the overall configuration showing a first embodiment of the present invention.

FIG. 2 is a bottom view thereof.

FIG. 3 is a schematic vertical sectional side view of the overall configuration showing a second embodiment of the present invention.

FIG. 4 is a schematic vertical sectional side view of the overall configuration showing a third embodiment of the present invention.

FIG. 5 is a schematic vertical sectional side view of the entire configuration showing a fourth embodiment of the present invention.

FIG. 6 is a schematic vertical sectional side view of the overall configuration showing a fifth embodiment of the present invention.

FIG. 7 is a schematic vertical cross-sectional side view of the entire configuration showing an example of a conventional electric vacuum cleaner that does not use an exhaust pressure levitation method.

FIG. 8 is a schematic vertical cross-sectional side view of the overall configuration showing a known technique using an exhaust pressure levitation system.

[Explanation of symbols]

 21 Vacuum Cleaner Main Body 23 Electric Blower 30 Bottom Wall 31 Exhaust Discharge Port 38 Exhaust Port 39 First Skirt 41 Second Skirt 42 Annular Space 43 Sliding Body 44 Ventilation Hole 45 Bottom Piece 45a Plane Section 48 Tube 49 Extension Plane Section 50 Third Skirt 54 Step-over wheel

Claims (5)

[Claims] 1. A vacuum cleaner main body is provided with an exhaust discharge port for blowing out an exhaust flow of an electric blower built in the main body, while an outer bottom part of the cleaner main body is annular so as to surround the exhaust discharge port. A first skirt is attached, and an annular second skirt is attached so as to surround the first skirt, and the lower end peripheral edge of the second skirt is located below the lower end of the first skirt. Further, in an exhaust pressure floating type electric vacuum cleaner having an exhaust port at an upper portion of the cleaner body that communicates with an annular space formed between the first and second skirts, a lower end portion of the first skirt is made of resin. An exhaust pressure levitation type electric vacuum cleaner, characterized in that the exhaust pressure levitation type vacuum cleaner is constituted by a ring-shaped sled body made of, and a ventilation hole penetrating in a thickness direction thereof is formed on a bottom piece of the sled body. 2. The bottom piece of the annular sled has a flat portion on the inner peripheral side of the site where the ventilation hole is formed, at the same height as the lower end opening surface of the ventilation hole or projecting below the opening surface. And
The exhaust pressure levitation type electric cleaning apparatus according to claim 1, wherein the ventilation hole forming portion has a flat surface portion or a projection portion that is flush with a lower end opening surface of the ventilation hole or projects downward from the opening surface. Machine. 3. A bottom piece of the sled body provided on the first skirt is extended to form an extension plane portion continuous with the first and second skirts, and a ventilation hole is formed in the extension plane portion. An exhaust pressure floating type vacuum cleaner according to claim 1. 4. An annular third skirt is attached to the outside of the second skirt so as to surround the second skirt, and the lower end of the third skirt is located below the lower end of the second skirt. The exhaust pressure levitation type vacuum cleaner according to any one of claims 1 to 3, which is configured as described above. 5. A cleaner main body is provided with an exhaust outlet from which an exhaust flow of an electric blower built into the main body is blown, and an outer peripheral portion of the cleaner main body is annularly formed so as to surround the exhaust outlet. A plurality of formed skirts are arranged at intervals, and in an exhaust pressure levitation type vacuum cleaner configured such that the lower end of the skirt on the outer peripheral side is located below the lower end of the skirt on the inner peripheral side, An exhaust pressure levitation type electric vacuum cleaner, characterized in that a step-carrying wheel that can be displaced in the vertical direction is provided in the cleaner body portion that is further forward than the front end of the outermost skirt.