JP6859063B2 - Suction tool - Google Patents

Description

The present invention relates to a suction tool incorporated in, for example, a vacuum cleaner, a blackboard eraser cleaner, etc., and is particularly devised so that dirt and dust can be separated and floated from the surface to be cleaned by ultrasonic vibration and effectively sucked. Regarding things.

For example, Patent Documents 1 to 5 disclose the configuration of a conventional suction tool.
First, in the case of the floor nozzle of the vacuum cleaner according to the invention described in Patent Document 1, an ultrasonic vibrator and a solid horn vibrated by the ultrasonic vibrator are provided on the rear side of the nozzle body. is set up. The ultrasonic waves emitted from this solid horn propagate in the air and vibrate the surface to be cleaned to raise fine dust on the surface to be cleaned and suck it from the suction port.

Next, in the case of the floor nozzle of the vacuum cleaner according to the invention described in Patent Document 2, an ultrasonic vibrator, a solid horn vibrated by the ultrasonic vibrator, and a solid horn vibrated by the ultrasonic vibrator are provided on the rear side of the nozzle body. A brush vibrated by this solid horn is installed. This brush vibrates rugs and floors to lift dust and suck it through the suction port.

Next, in the case of the electric vacuum cleaner according to the invention described in Patent Document 3, an ultrasonic vibrator and a solid vibrating body vibrated by the ultrasonic vibrator and brought into contact with the surface to be cleaned are in the suction port. And are installed. The solid vibrating body directly vibrates the surface to be cleaned, releases dust from the surface to be cleaned, and sucks dust from the suction port.

Next, in the case of the vacuum cleaner according to the invention described in Patent Document 4, an ultrasonic remover is detachably attached. In this ultrasonic remover, a Langevin type oscillator is installed in a tubular case provided with a suction hole at the tip, and a horn is attached to the Langevin type oscillator. The tip of this horn projects outward from the tip of the case.
The ultrasonic remover is attached to the tip of the nozzle of the vacuum cleaner, and for example, the tip of the horn is brought into contact with a carpet or a tile in a bathroom to remove dirt, and the dust generated at that time is removed from the suction hole. Suck from. In this way, the vacuum cleaner is used for the purpose of removing stains on carpets and removing stains on tile joints in bathrooms.

Further, in the case of the suction port assembly according to the invention described in Patent Document 5 and the vacuum cleaner including the suction port assembly, a rotary drum is installed in the suction port, and the first brush is provided on the outer peripheral surface of the rotary drum. Is projected and arranged, and a second brush is installed in front of the suction port. The first brush and the second brush are vibrated by an ultrasonic vibrator, whereby dust on the surface to be cleaned is separated and idled.

Japanese Unexamined Patent Publication No. 58-49129 Japanese Unexamined Patent Publication No. 58-49130 Japanese Unexamined Patent Publication No. 4-347120 Japanese Unexamined Patent Publication No. 2005-80822 Japanese Unexamined Patent Publication No. 2006-297050

According to the above-mentioned conventional configuration, there are the following problems.
That is, in the inventions described in Patent Documents 1 to 5, there is a problem that dirt and dust cannot be separated and floated by ultrasonic vibration and effectively sucked. Hereinafter, a specific description will be given.
First, as in the invention described in Patent Document 2, a part of the invention described in Patent Document 3, and the invention described in Patent Document 5, a brush, a solid vibrating body having protrusions, and a brush member are vibrated. On the other hand, for those that separate and move dirt and dust, paper scraps and hair will wrap around the brush, solid vibrating body with protrusions, and brush member, and as a result, the separation and floating function of dirt and dust will be impaired. There was a problem.
On the other hand, in the case of the invention described in Patent Document 1, the remaining invention described in Patent Document 3, and the invention described in Patent Document 4, there is no such concern, but for suction. There is a problem that the space where the dust separated from the surface to be cleaned is suspended due to the air flow and the ultrasonic vibration is not sufficient.
That is, in the case of the invention described in Patent Document 1, since the portion where the solid horn is arranged and the suction port are partitioned, it is difficult to generate an effective air flow for suction, and the patent In the case of the remaining inventions described in Document 3, there is a circumstance that the solid vibrating body is arranged in the suction port and the area of the suction port is narrowed, and further described in Patent Document 4. This is because even in the case of the present invention, since the suction hole is provided only on the outer peripheral side of the horn, the area for suction is limited.

The present invention has been made based on such a point, and an object of the present invention is to provide a suction tool capable of separating and floating dirt and dust from a surface to be cleaned by ultrasonic vibration and effectively sucking them. is there.

In order to solve the above problems, the suction tool according to claim 1 of the present invention includes a suction tool main body provided with a suction port, an ultrasonic horn installed on the suction tool main body, and an ultrasonic wave installed on the suction tool main body. comprising an ultrasonic vibrator which vibrates the horn, and grooves which the aspirant can float separated from a surface to be cleaned with circulating air toward the suction port provided at a tip of the ultrasonic horn, and the The groove is set to a depth that is a half wavelength when the ultrasonic vibration of the ultrasonic horn uses air as a medium and becomes an antinode of the vibration, and it takes 5 seconds or more for the surface to be cleaned to melt. It is characterized in that the frequency and amplitude of the ultrasonic vibration are set so as to be performed.
Further, in the suction tool according to the second aspect , when the frequency of the ultrasonic vibration is 28 kHz, the amplitude of the ultrasonic vibration is set to 11 μm or less in the suction tool according to the first aspect, and the frequency of the ultrasonic vibration is set to 11 μm or less. In the case of 40 kHz, the amplitude of the ultrasonic vibration is set to 4 μm or less, when the frequency of the ultrasonic vibration is 60 kHz, the amplitude of the ultrasonic vibration is set to 3 μm or less, and the frequency of the ultrasonic vibration is other. If frequency is characterized in that you set the frequency and amplitude of the ultrasonic vibrations to require more than 5 seconds until dissolved the above surface to be cleaned.
The suction tool according to claim 3 is the suction tool according to claim 1 or 2, wherein the base end portion of the groove is formed in an arc shape.
The suction tool according to claim 4 is the suction tool according to any one of claims 1 to 3, wherein the tip of the ultrasonic horn is formed in an arc shape. ..
Further, the suction tool according to claim 5 is the suction tool according to any one of claims 1 to 4, wherein the suction port is extended by a predetermined width, and the ultrasonic horn is also substantially the same width as the predetermined width. It is characterized by being extended.
Further, the suction tool according to claim 6 is the suction tool according to any one of claims 1 to 5, the ultrasonic horn is in contact in a state of being elastically urged to the object and wherein Rukoto It is something to do.
Further, the suction tool according to claim 7, in the suction tool according to any one of claims 1 to 6, the suction tool is characterized in der Rukoto one for vacuum cleaner.
Further, the suction tool according to claim 8, in the suction tool of claim 7, wherein the ultrasonic horn is one which is characterized that you have placed behind along the traveling direction of the suction opening.
Further, the suction tool according to claim 9, in suction tool according to any one of claims 1 to 8, the suction tool is characterized in der Rukoto one for blackboard eraser cleaner.

As described above, according to the suction tool according to claim 1 of the present invention, the suction tool main body provided with the suction port, the ultrasonic horn installed in the suction tool main body, and the ultrasonic waves installed in the suction tool main body. Since it is provided with an ultrasonic vibrator that vibrates the horn and a groove provided at the tip of the ultrasonic horn that allows air to flow toward the suction port and allows dust separated from the surface to be cleaned to float, ultrasonic waves are provided. Dirt and dust are separated and idled by vibration, and air can be circulated through the groove to effectively suck.
Further, according to the suction tool according to claim 2, in the suction tool according to claim 1, since the base end portion of the groove is formed in an arc shape, ultrasonic waves are easily concentrated on the tip side and are effectively soiled. And dust can be separated and floated.
Further, according to the suction tool according to claim 3, in the suction tool according to claim 1 or 2, since the tip portion of the ultrasonic horn is formed in an arc shape, it is possible to prevent the object from being damaged.
Further, according to the suction tool according to claim 4, in the suction tool according to any one of claims 1 to 3, the groove has a half wavelength or less when the ultrasonic vibration of the ultrasonic horn uses air as a medium. However, since the depth is set to be the antinode of the vibration, the attenuation of the ultrasonic vibration emitted from the surface of the ultrasonic horn is suppressed even in the portion where the groove is formed at the tip of the ultrasonic horn. It is possible to effectively separate and move dirt and dust from the object.
Further, according to the suction tool according to claim 5, in the suction tool according to any one of claims 1 to 4, the frequency / amplitude of the ultrasonic vibration is such that the surface to be cleaned and the ultrasonic horn are in contact with each other for a predetermined time. Even if it is, since the surface to be cleaned is set in a range where it is difficult to melt, it is possible to prevent the object from being damaged.
Further, according to the suction tool according to claim 6, in the suction tool according to any one of claims 1 to 5, the suction port is extended by a predetermined width, and the ultrasonic horn is substantially the same as the predetermined width. Since the width is extended, dirt and dust can be separated and moved over a wide range.
Further, according to the suction tool according to claim 7, in the suction tool according to any one of claims 1 to 6, the ultrasonic horn is brought into contact with the object in an elastically urged state. The tip of the ultrasonic horn can be brought into contact with the object with appropriate pressure.
Further, according to the suction tool according to claim 8, in the suction tool according to any one of claims 1 to 7, the suction tool is for a vacuum cleaner, so that the ultrasonic vibration is generated in the vacuum cleaner. By separating and floating dirt and dust, the above effect can be achieved.
Further, according to the suction tool according to the ninth aspect, in the suction tool according to the eighth aspect, since the ultrasonic horn is arranged rearward along the traveling direction of the suction port, the separated and idle dust is efficiently removed. Can be sucked well.
Further, according to the suction tool according to claim 10, in the suction tool according to any one of claims 1 to 8, the suction tool is for a blackboard eraser cleaner, and therefore, the blackboard eraser cleaner has the above effect. Can play.

It is a figure which shows the 1st Embodiment of this invention, and is the side view which shows the vacuum cleaner. It is a figure which shows the 1st Embodiment of this invention, and is the side sectional view which shows the suction tool. It is a figure which shows the 1st Embodiment of this invention, and is the perspective view which shows the ultrasonic horn. It is a figure which shows the 1st Embodiment of this invention, and is the front view which shows the ultrasonic horn. It is a figure which shows the 1st Embodiment of this invention, and is the enlarged view of the V part of FIG. It is a figure which shows the 1st Embodiment of this invention, and is the enlarged view of the VI part of FIG. It is a figure which shows the 1st Embodiment of this invention, and is the front view which shows the state which the tip of the ultrasonic horn is in contact with a carpet. 8 (a) is an enlarged view showing how ultrasonic waves are concentrated in the groove of the ultrasonic horn, and FIG. 8 (b) is the tip of the ultrasonic horn. It is an enlarged view which shows the state that the ultrasonic wave is diffused from to the outside. It is a figure which shows the 1st Embodiment of this invention, and is a table which shows the example of the combination of the frequency and the amplitude of the ultrasonic horn so that an object does not melt easily. It is a figure which shows the 1st Embodiment of this invention, and is the figure which shows the experimental result about the presence or absence of melting of a plastic bag by ultrasonic vibration of an ultrasonic horn, and FIG. A diagram showing the relationship between the melting start time, FIG. 10B is a diagram showing the relationship between the amplitude and the melting start time when the frequency is 40 kHz, and FIG. 10C is a diagram showing the relationship between the amplitude and the melting start time when the frequency is 60 kHz. It is a figure which shows the relationship. It is a figure which shows the 1st Embodiment of this invention, and is the figure which shows the experimental result about the presence or absence of melting of a plastic bag when the _{amplitude of the ultrasonic vibration of an ultrasonic horn is set to 6 μm 0-P, and is the frequency and melting.} It is a figure which shows the relationship of the start time. It is a figure which shows the 1st Embodiment of this invention, and is the figure which showed the relationship between the distance from the surface of an ultrasonic horn, and the sound pressure of an ultrasonic vibration. It is a figure which shows the 1st Embodiment of this invention, and is a table which shows the relationship between the air temperature and a sound velocity, a frequency, a wavelength, and a half wavelength. FIG. 14 (a) is a diagram showing the first embodiment of the present invention, showing the result of an experiment in which a piece of paper is moved by the ultrasonic vibration of the ultrasonic horn at a location away from the vibration surface of the ultrasonic horn. ) Shows the relationship between the distance from the vibrating surface and the distance the piece of paper moved when the frequency is 28 kHz and the amplitude is 30 μm _0-P . FIG. 14 (b) shows the relationship between the frequency of 60 kHz and the amplitude of 6 μm _0-P . It is a figure which shows the relationship between the distance from the vibrating surface at the time, and the distance which a piece of paper moved. It is a figure which shows the 1st Embodiment of this invention, and is the figure which shows the result of the experiment which moves a piece of paper away from the vibrating surface of the ultrasonic horn by the ultrasonic vibration of the ultrasonic horn, and has a frequency of 28 kHz. It is a figure which shows the relationship between the amplitude and the distance which a piece of paper moved when the distance from a vibrating surface is 10 mm. 16A is a diagram showing the relationship between the frequency and the damping factor when the vibrating surface distance is 3 mm, and FIG. 16B is a diagram showing the relationship between the frequency and the damping factor when the vibrating surface distance is 3 mm. It is a figure which shows the relationship between the frequency and the attenuation rate at the time. It is a figure which shows the 2nd Embodiment of this invention, and is the perspective view which shows the appearance of the handy type vacuum cleaner. It is a figure which shows the 3rd Embodiment of this invention, and is the front sectional view which shows the blackboard eraser cleaner.

Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 16. In this first embodiment, the suction tool according to the present invention is applied to the mobile vacuum cleaner 1.
As shown in FIG. 1, the vacuum cleaner 1 includes a vacuum cleaner main body 3, a suction hose 5, and a suction tool 7 detachably attached to the tip of the suction hose 5.

As shown in FIG. 1, the vacuum cleaner main body 3 first has an outer casing 8. Rear wheels 9 and 9 (only one side in FIG. 1 is shown) are rotatably provided on both sides of the outer casing 8 on the rear end side (right side in FIG. 1) in the width direction. Further, a universal caster 11 is installed on the front end side (left side in FIG. 1) of the outer casing 8, whereby the orientation of the vacuum cleaner 1 can be smoothly changed. Further, a motor, a suction fan, a filter, etc. (not shown) are incorporated in the vacuum cleaner main body 3.

Further, an ultrasonic oscillator 17 is installed in the outer casing 8. The ultrasonic oscillator 17 generates a voltage pulse at a predetermined frequency and amplitude, and the voltage pulse vibrates an ultrasonic oscillator described later to generate an ultrasonic wave.
The suction hose 5 is detachably connected to the outer casing 8, and a grip portion 19 is attached to the tip of the suction hose 5.

As shown in FIG. 2, the suction tool 7 has a suction pipe 21. The base end side (upper side in FIG. 2) of the suction pipe 21 is detachably inserted and connected to the tip end side of the suction hose 5. Further, a suction nozzle 23 is rotatably installed on the tip end side of the suction pipe 21 in the direction indicated by the arrow a. The suction nozzle 23 is formed with a recess 25 opened on the bottom surface side (lower side in FIG. 2), and a suction port for communicating the inside of the recess 25 and the inside of the suction pipe 21 is formed on the upper side of the recess 25. 27 is provided.

Further, an ultrasonic vibration unit accommodating member 29 is installed behind the suction pipe 21 (on the right side in FIG. 2), and the ultrasonic vibration unit 31 is an elastic member in the ultrasonic vibration unit accommodating member 29. The suction pipe 21 is movably installed in the axial direction (upper and lower directions in FIG. 2) via the coil spring 33.

As shown in FIG. 2, the ultrasonic vibration unit 31 first has a bracket 35. The bracket 35 is connected to the inner upper end (upper end in FIG. 2) of the ultrasonic vibration unit accommodating member 29 via the coil spring 33. Further, an ultrasonic vibrator 37 is installed on the bracket 35. The ultrasonic vibrator 37 has a proximal end side vibrating member 39 and a distal end side vibrating member 41, and between these proximal end side vibrating members 39 and the distal end side vibrating member 41, a first piezo element 43 and a second piezo The element 45 is inserted. An ultrasonic horn 47 is fixed to the tip side (lower side in FIG. 2) of the tip side vibrating member 41. Further, the tip-side vibrating member 41 is fixed to the bracket 35 via the fixing plate 49.

The first piezo element 43 and the second piezo element 45 are connected to the ultrasonic oscillator 17 already described via the voltage input cable 50. The voltage pulse generated by the ultrasonic oscillator 17 causes the thicknesses of the first piezo element 43 and the second piezo element 45 (the size in the vertical direction in FIG. 2) to fluctuate, which causes ultrasonic vibration. .. As a result, the ultrasonic horn 47 is ultrasonically vibrated.
The voltage input cable 50 is installed along the outside of the suction hose 5.

As shown in FIGS. 3 and 4, the ultrasonic horn 47 is wide, and the thickness of the tip side 47a (lower left side in FIG. 4) is thinner than the thickness of the base end side 47b. Although it is wide as described above, it is set to have substantially the same width as the inner width of the suction nozzle 23 described above. Further, the lengths of the tip end side 47a and the base end side 47b are set to be substantially the same, and a tapered portion 47c is provided at the boundary portion thereof. Further, as shown in FIGS. 3 to 5, a plurality of (8 in the case of this first embodiment) grooves 51 are formed at the tip (lower left end in FIG. 3) of the ultrasonic horn 47. It is formed. By providing the groove 51, as shown in FIG. 6, the air flow from the anti-suction port 27 side (right side in FIG. 6) to the suction port 27 side (left side in FIG. 6) of the ultrasonic horn 47 is promoted. It has become like.

Further, as shown in FIG. 7, the tip side of the ultrasonic horn 47 comes into contact with the carpet 53, which is an object, thereby applying the sound pressure of ultrasonic vibration at a short distance to the carpet 53. Tell. The sound pressure of the ultrasonic vibration causes the carpet 53 to vibrate, and dirt on the surface thereof and dust that has entered the inside are separated and idled. Dirt and dust separated / floating from the carpet 53 float in the groove 51 and are sucked / removed from the suction port 27.

Further, as shown in FIG. 2, the ultrasonic horn 47 is arranged behind the suction port 27 in the traveling direction of the suction tool 7 (direction from right to left in FIG. 2). As a result, dirt and dust separated and floated from the carpet 53 are effectively sucked into the suction port 27.

Further, when the groove 51 is viewed from the front, it has a shape as shown in FIG. 8A, and its base end side is formed in an arc shape. As a result, the ultrasonic vibration is concentrated on the tip of the ultrasonic horn 47. Further, when the tip of the ultrasonic horn 47 is viewed from the side surface, as shown in FIG. 8B, it has a shape protruding in an arc shape. As a result, ultrasonic waves are diffused from the tip of the ultrasonic horn 47.

Next, the setting of the frequency and amplitude of the ultrasonic vibration of the ultrasonic horn 47 will be described. The frequency and amplitude of the ultrasonic vibration of the ultrasonic horn 47 are set so that the object does not easily melt.
As shown in the table of FIG. 9, when the frequency is 28 _{kHz, the amplitude is set to 11 μm 0-P} or less, when the frequency is 40 kHz, the amplitude is _{set to 4 μm 0-P} or less, and when the frequency is 60 kHz. The amplitude is _{set to 3 μm 0-P} or less.
In addition, the fact that the object does not melt easily means a state in which "it takes 5 seconds or more to melt".
By the way, when performing normal cleaning with a normal vacuum cleaner, the work is not performed at the same place for more than 5 seconds.

The above set values were derived from the following experiments.
First, the frequency is at 28 kHz, the amplitude _{3.8μm 0-P, 4.4μm 0-} P, 6μm 0-P, 6.2μm 0-P, 8.2μm 0-P, each of 10.2 .mu.m _0-P When set to, the time until the plastic bag began to melt was measured. As a result, the results shown in FIG. 10 (a) were obtained.
Note that FIG _{. 10A is a diagram showing the relationship between the two, with the amplitude μm 0-P} on the horizontal axis and the melting start time (sec) on the vertical axis. "0-P" means one amplitude.
According to the above results, initially dissolved in about 10 seconds when the amplitude is 10.2 .mu.m _0-P, initially soluble in about 20 seconds when the 8.2 .mu.m _0-P, when the 6.2 .mu.m _0-P 60 seconds beginning to melt in degree, 3.8μm _0-P, is 4.4μm _0-P, when the 6μm _0-P began to melt in about 120 seconds.
Based on this result, when the frequency was 28 kHz, the amplitude was set to _{11 μm 0-P} or less in consideration of the safety factor while predicting the amplitude that it takes 5 seconds or more to start melting.

The frequency is at 40 kHz, the amplitude _{2.3μm 0-P, 4.0μm 0-} P, 6.2μm 0-P, if you set the respective 8.3 .mu.m _0-P, FIG. 10 (b) The results shown are obtained.
In addition, FIG. 10B is also _{a diagram showing the relationship between the two, with the amplitude μm 0-P} on the horizontal axis and the melting start time (sec) on the vertical axis.
According to the above results, the amplitude begins to melt at 0 seconds when 8.3 .mu.m _0-P, initially melted in about 2 seconds when the 6.2 .mu.m _0-P, when the 4.0 .mu.m _0-P about 6 seconds When it was 2.3 μm _0-P , it started to melt in about 20 seconds. Therefore, when the frequency is 40 kHz, the amplitude is _{set to 4 μm 0-P} or less.

When the frequency is 60 kHz and the amplitude is set to 2.2 _{μm 0-P} , 4.1 μm _0-P , and 6.1 μm _0-P , respectively, the results shown in FIG. 10 (c) are obtained. It was.
In addition, FIG. 10C is also _{a diagram showing the relationship between the two, with the amplitude μm 0-P} on the horizontal axis and the melting start time (sec) on the vertical axis.
According to the above results, when the amplitude is 6.1 [mu] m _0-P begin to melt at about 0 sec, when the 4.1 .mu.m _0-P begin to melt at about one second, when the 2.2 .mu.m _0-P 20 seconds It started to melt in about. Therefore, when the frequency is 40 kHz, the amplitude is _{set to 3 μm 0-P} or less.

In order to confirm the validity of the results of the above test, _{an experiment was conducted to confirm the presence or absence of melting when the amplitude was set to 6 μm 0-P} and the frequencies were 28 kHz, 40 kHz, and 60 kHz. The result is shown in FIG. According to it, when the frequency was 60 kHz, it started to melt in 0 seconds, when the frequency was 40 kHz, it started to melt in 1 second, and when the frequency was 28 kHz, it started to melt in 60 seconds. From this, it is possible to confirm the validity of the set values shown in the table of FIG.

Next, the setting of the depth (d) (shown in FIG. 5) of the groove 51 of the ultrasonic horn 47 will be described. The depth (d) of the groove 51 is set so that the sound pressure of the ultrasonic vibration emitted from the surface in the groove 51 becomes as large as possible at the tip of the ultrasonic horn 47. As shown in FIG. 12, the ultrasonic vibration changes periodically while being attenuated as the distance from the surface of the ultrasonic horn 47 increases.
Note that FIG. 12 is a diagram showing the relationship between the two, with the horizontal axis representing the distance and the vertical axis representing the sound pressure. The portion surrounded by the middle circle in FIG. 12 is the antinode portion of ultrasonic vibration in which the sound pressure increases.
According to FIG. 12, the sound pressure on the surface of the ultrasonic horn 47 is the highest, and then the sound pressure is increased at a position separated from the surface of the ultrasonic horn 47 by half a wavelength (λ / 2). Then, the peak of the sound pressure is reached every half wavelength (λ / 2). Therefore, if the depth (d) of the groove 51 is set to be half a wavelength (λ / 2) or less and is an antinode of vibration, the tip of the ultrasonic horn 47 can be set even in the portion where the groove 51 is present. In, the sound pressure of the ultrasonic vibration can be increased.

The half wavelength (λ / 2) is obtained as follows.
First, the speed of sound (m / s) is calculated by the following equation (I).
C = f × λ ――― (I)
However,
C: Speed of sound (m / s)
f: Frequency (kHz)
λ: Wavelength (mm)

By modifying the above formula (I), the wavelength can be obtained.
λ = C / f --- (II)
However,
λ: Wavelength (mm)
C: Speed of sound (m / s)
f: Frequency (kHz)

The half wavelength is obtained by halving the λ of the above formula (II).
λ / 2 = C / (2 × f) --- (III)
However,
λ: Wavelength (mm)
C: Speed of sound (m / s)
f: Frequency (kHz)

Further, the speed of sound C (m / s) differs depending on the air temperature.
The relationship between the sound velocity C due to the air temperature, the frequency f calculated from the sound velocity C, the wavelength λ, and the half wavelength λ / 2 is shown in the table of FIG.
That is, when the frequency is 28.0 kHz, the depth (d) of the groove 51 is set to 6 mm or less, and when the frequency is 40.0 kHz, the depth (d) of the groove 51 is set to 4 mm or less. When the frequency is 60.0 kHz, it is preferable to set the depth (d) of the groove 51 to 3 mm or less.
Further, the depth (d) of the groove 51 is set to such an extent that dirt and dust separated from the carpet 53 by ultrasonic vibration can be floated in the groove 51 in order to be sucked from the suction port 27. Need to be done. The set values of the depth (d) of the groove 51 as described above are all sufficient for suspending dirt and dust separated from the carpet 53 in the groove 51.

Further, here, an experiment was conducted in which the frequency was 28 kHz, the amplitude was 30 μm _0-P , the ultrasonic horn 47 was a cylindrical shape of φ8 mm, and the piece of paper was moved by the ultrasonic vibration emitted from the ultrasonic horn 47. The results shown in 14 (a) were obtained.
Note that FIG. 14A is a diagram showing the relationship between the two, with the horizontal axis representing the distance (mm) from the vibrating surface and the vertical axis representing the distance (mm) that the piece of paper moved.
According to the above result, the distance that the piece of paper moves becomes smaller as the distance from the surface of the ultrasonic horn 47 increases. Further, at a position of 6 mm, which is the same as the depth (d) of the groove 51 set when the frequency is 28.0 kHz, the distance that the paper piece has moved is as large as about 7 mm.

Further, an experiment was conducted in which a piece of paper was moved by ultrasonic vibration emitted from the ultrasonic horn 47, with a frequency of 60 kHz, an amplitude of 6 μm _{0-P, and an ultrasonic horn 47 of φ7.5 mm. FIG.} The results shown in (b) were obtained.
Note that FIG. 14B is a diagram showing the relationship between the two, with the horizontal axis representing the distance (mm) from the vibrating surface and the vertical axis representing the distance (mm) that the piece of paper moved.
According to the above results, the distance the piece of paper has moved decreases as the distance from the surface of the ultrasonic horn 47 increases. Further, at a position of 3 mm, which is the same as the depth (d) of the groove 51 set when the frequency is 60.0 kHz, the distance the paper piece has moved is as large as about 7 mm.
In the graph of FIG. 14B, the apex (vibration antinode) of the mountain of the distance that the piece of paper moved appears at the position of 3 mm.

Further, when the frequency was set to 28 kHz and the amplitude of the ultrasonic vibration was changed to measure the distance that the piece of paper moved at a position where the distance from the surface of the ultrasonic horn 47 was 10 mm, as shown in FIG. Results were obtained.
Note that FIG. 15 is a diagram showing the relationship between the two, with the horizontal axis representing the vibration amplitude (μm _0-P ) and the vertical axis representing the distance (mm) that the piece of paper moved.
According to the above results, the larger the amplitude of the ultrasonic vibration, the greater the influence on the piece of paper.

Next, when the frequency was changed and the amplitude attenuation rate was measured at a position where the distance from the surface of the ultrasonic horn 47 was 3 mm, the results shown in FIG. 16A were obtained.
Note that FIG. 16A is a diagram showing the relationship between the two, with the frequency (kHz) on the horizontal axis and the amplitude attenuation factor (%) on the vertical axis.
Further, when the frequency was changed and the amplitude attenuation rate was measured at a position where the distance from the surface of the ultrasonic horn 47 was 5 mm, the result shown in FIG. 16B was obtained.
Note that FIG. 16B is a diagram showing the relationship between the two, with the frequency (kHz) on the horizontal axis and the amplitude attenuation factor (%) on the vertical axis.
According to the above results, the lower the frequency, the lower the attenuation rate, and it can be seen that the frequency should be set lower.

The operation will be described based on the above configuration.
First, the suction tool 7 is attached to the tip of the suction hose 5 to operate a motor (not shown) and an ultrasonic oscillator 17. As a result, suction from the suction port 27 is started, and ultrasonic vibration of the ultrasonic horn 47 is started.
Next, the tip of the ultrasonic horn 47 is brought into contact with the carpet 53, which is the object. As a result, the carpet 53 is vibrated, dirt and dust are separated and floated, and the carpet 53 is blown toward the traveling direction while floating in the groove 51.
The dirt and dust are sucked from the suction port 27.

Further, since the ultrasonic vibration unit 31 is movably installed in the axial direction (vertical direction in FIG. 2) of the suction pipe 21 via the coil spring 33, the ultrasonic force due to the elastic force of the coil spring 33 causes the ultrasonic waves. The tip of the horn 47 is brought into contact with the rug 53 with an appropriate pressure.

As described above, according to the present embodiment, the following effects can be obtained.
First, dirt and dust can be separated and floated by ultrasonic vibration and effectively sucked. This is because an ultrasonic horn 47 is installed in the vicinity of the suction port 27, and the ultrasonic horn 47 separates and floats dirt and dust from the rug 53, which is an object, and the ultrasonic waves. Since the groove 51 is formed in the horn 47, the air flow is promoted from the anti-suction port 27 side (right side in FIG. 6) of the ultrasonic horn 47 to the suction port 27 side (left side in FIG. 7). Moreover, the dirt and dust are effectively suspended in the groove 51.
Further, since the ultrasonic horn 47 has a wide shape, dirt and dust can be separated and floated from the carpet 53 over a wide range.
Further, since the ultrasonic horn 47 is arranged behind the suction port 27, it is possible to efficiently suck the dust separated and idled by the ultrasonic vibration.
Incidentally, assuming that the ultrasonic horn 47 is installed in front of the suction port 27, dust is displaced to the rear of the ultrasonic horn 47 by suction. At this time, since the portion where the dust is induced by the suction is after the ultrasonic horn 47 has passed, the effect of the ultrasonic vibration of the ultrasonic horn 47 cannot be obtained for this portion. ..

Further, since the ultrasonic vibration unit 31 is movably installed in the axial direction (vertical direction in FIG. 2) of the suction pipe 21 via the coil spring 33, the ultrasonic wave is caused by the elastic force of the coil spring 33. The tip of the horn 47 can be brought into contact with the rug 53 with an appropriate pressure.

Further, when the groove 51 is viewed from the front, as shown in FIG. 8A, the base end side of the groove 51 has an arc shape, so that the ultrasonic vibration is concentrated on the tip of the ultrasonic horn 47. It is possible to effectively separate and idle dirt and dust from the carpet 53.
Further, when the tip of the ultrasonic horn 47 is viewed from the side surface side, as shown in FIG. 8B, it has a shape protruding in an arc shape, and ultrasonic vibration is diffused, so that the ultrasonic vibration is diffused over a wide range. Dirt and dust can be separated and floated from the carpet 53.
Further, the depth (d) of the groove 51 is set to be half a wavelength (λ / 2) or less when the air of the ultrasonic vibration of the ultrasonic horn 47 is used as a medium and becomes an antinode of the vibration. Therefore, ultrasonic vibration can be generated with a large amplitude even in the portion where the groove 51 is formed at the tip of the ultrasonic horn 47, and dirt and dust are effectively separated and idled from the rug 53. Can be made to.

Next, a second embodiment of the present invention will be described with reference to FIG. In the case of this second embodiment, an example in which the present invention is applied to the handy type vacuum cleaner 1 is shown.
The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
Even with such a handy type vacuum cleaner 1, the same effect can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIG.
In this third embodiment, the suction tool 61 is applied to the blackboard eraser cleaner 63.
The blackboard eraser 63 has a hollow outer casing 65. A suction port 67 is opened on the upper side of the outer casing 65 in FIG. Further, a vacuum suction unit 69 is installed in the outer casing 65, and the vacuum suction unit 69 includes a motor (not shown), a suction fan, a filter, and the like. The vacuum suction unit 69 sucks from the outside of the outer casing 65 through the suction port 67.

The suction tool 61 includes a net-like case 71 having an open upper side in FIG. 18, a filter 73 installed on the inner peripheral side of the case 71, and an ultrasonic vibrator 37 installed on the bottom surface of the case 71. Consists of. The tip of the ultrasonic horn 47 of the ultrasonic transducer 37 comes into contact with the surface of the blackboard eraser 75, which is an object. Further, an ultrasonic oscillator (not shown) is installed, and the ultrasonic oscillator and the ultrasonic oscillator 37 are connected by a voltage input cable (not shown).
The configuration of the ultrasonic vibrator 37 is the same as that of the first embodiment, and the same parts in the drawings are designated by the same reference numerals and the description thereof will be omitted.

The operation will be described based on the above configuration.
First, the vacuum suction unit 69 is operated to start suction, and at the same time, the operation of the ultrasonic vibrator 37 is started.
Next, the blackboard eraser 75, which is an object, is moved in the left-right direction in FIG. 18 on the suction port 67. At this time, the chalk powder adhering to the blackboard eraser 75 is separated and idled by the ultrasonic vibration of the ultrasonic horn 47, and is sucked into the outer casing 65.

As described above, even in this third embodiment, the same effect as that of the first and second embodiments can be obtained.

The present invention is not limited to the first to third embodiments.
Various cases can be considered for the shape, number, depth, etc. of the grooves of the ultrasonic horn.
In the first embodiment, the voltage input cable is installed along the outside of the suction hose, but it may be passed through the inside of the suction hose.
Further, in the first to third embodiments, a mobile vacuum cleaner, a handy type vacuum cleaner, and a blackboard eraser cleaner have been described as examples, but they are used in various places such as stain removal. Applicable to suction tools.
In addition, the illustrated configuration is merely an example and is not limited thereto.

The present invention relates to a suction tool, and in particular, a device devised so that dirt and dust can be separated and floated by ultrasonic vibration to be effectively sucked, and is suitable for, for example, an electric vacuum cleaner and a blackboard eraser cleaner.

7 Suction tool 21 Suction pipe (part of the suction tool body)
27 Suction port 29 Ultrasonic vibration unit housing member (part of the suction tool body)
33 Coil spring (elastic member)
37 Ultrasonic Oscillator 47 Ultrasonic Horn 51 Groove

Claims (9)

A suction tool body with a suction port and
The ultrasonic horn installed on the suction tool body and
An ultrasonic oscillator installed on the suction tool body and vibrating the ultrasonic horn,
A groove provided at the tip of the ultrasonic horn that allows air to flow toward the suction port and allows the object to be sucked separated from the surface to be cleaned to float.
Equipped with,
The groove is set to a depth that is half a wavelength when the ultrasonic vibration of the ultrasonic horn uses air as a medium and is an antinode of the vibration.
A suction tool characterized in that the frequency and amplitude of the ultrasonic vibration are set so that it takes 5 seconds or more for the surface to be cleaned to melt. In the suction tool according to claim 1,
When the frequency of the ultrasonic vibration is 28 kHz, the amplitude of the ultrasonic vibration is set to 11 μm or less.
When the frequency of the ultrasonic vibration is 40 kHz, the amplitude of the ultrasonic vibration is set to 4 μm or less.
When the frequency of the ultrasonic vibration is 60 kHz, the amplitude of the ultrasonic vibration is set to 3 μm or less.
If the frequency of the ultrasonic vibration of the other frequencies suction device, characterized in that you set the frequency and amplitude of the ultrasonic vibrations to require more than 5 seconds to the surface to be cleaned is melted. In the suction tool according to claim 1 or 2.
A suction tool characterized in that the base end of the groove is formed in an arc shape. In the suction tool according to any one of claims 1 to 3.
A suction tool characterized in that the tip of the ultrasonic horn is formed in an arc shape. In the suction tool according to any one of claims 1 to 4.
A suction tool characterized in that the suction port is extended by a predetermined width, and the ultrasonic horn is also extended by substantially the same width as the predetermined width. In the suction tool according to any one of claims 1 to 5.
The ultrasonic horn is in contact in a state of being elastically urged to the object extractor tool, characterized in Rukoto. In the suction tool according to any one of claims 1 to 6.
Suction tool is the suction tool which is characterized in der Rukoto thing for an electric vacuum cleaner. In the suction tool according to claim 7,
The ultrasonic horn suction tool characterized that you have placed behind along the traveling direction of the suction opening. In the suction tool according to any one of claims 1 to 8.
Suction tool the suction tool, characterized in der Rukoto one for blackboard eraser cleaner.

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