cleaning machine

Abstract

To provide a vacuum cleaner that offers improved cleaning performance and quieter operation. [Solution] The electric vacuum cleaner 100 of the present invention comprises a vacuum cleaner body 1 having an electric blower 40 and a suction nozzle 200 that sucks up dust with the suction force generated by the electric blower 40. The suction nozzle 200 has a first rotating cleaning body 220 provided with a first brush 220k and a second rotating cleaning body 230 provided with a second brush 230k having a larger diameter than the first brush 220k. The first rotating cleaning body 220 has a drive motor 221 inside, and the second rotating cleaning body 230 has a brush body 230K formed by bundling multiple second brushes 230k together arranged in a spiral shape, and the first rotating cleaning body 220 and the second rotating cleaning body 230 are arranged to be in contact with each other.

Description

Technical Field

[0005] , , ,

[0001] The present invention relates to a vacuum cleaner.

Background Art

[0002] Electric vacuum cleaners used in ordinary households are roughly classified into those for cleaning a flooring floor and those for cleaning a floor covered with a carpet. Patent Document 1 describes a configuration in which the tip of the brush of the carpet brush is disposed above the tip of the brush of the other rotating brush in order to reduce the contact resistance of the electric vacuum cleaner with respect to the carpet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when there is one rotating brush, there is a problem that dust remaining on the floor surface (particularly fine particles such as pollen and dust) cannot be induced (collected) into the dust suction port and remains in the airtight holding member provided behind the rotating brush. In recent years, home appliances tend to be quiet, and there is a need to reduce the noise around the drive motor of the rotating brush. The present invention has been made to solve the above problems, and an object thereof is to provide a vacuum cleaner capable of improving cleaning performance and achieving quiet operation.

Means for Solving the Problems

[0005] To solve the aforementioned problems, the electric vacuum cleaner of the present invention comprises a vacuum cleaner body having an electric blower and a suction nozzle that sucks up dust with the suction force generated by the electric blower, the suction nozzle having a first rotating cleaning body provided with a first brush and a second rotating cleaning body provided with a second brush having a larger diameter than the first brush, the first rotating cleaning body having a drive motor inside, the second rotating cleaning body having multiple second brushes arranged in a spiral shape, and the first rotating cleaning body and the second rotating cleaning body being arranged to be in contact with each other. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a vacuum cleaner that can improve cleaning performance and reduce noise. [Brief explanation of the drawing]

[0007] [Figure 1] This is a perspective view of an electric vacuum cleaner according to an embodiment of the present invention, stored in a support base. [Figure 2] This is a top view of a standard mouthpiece. [Figure 3] This is a bottom view of the standard mouthpiece. [Figure 4A] This is a conceptual schematic diagram showing the brush bristles of a scraping and rotating cleaning body. [Figure 4B] This is a conceptual schematic diagram showing the brush bristles of a wiping and rotating cleaning body. [Figure 5] This is a conceptual diagram showing the cleaning operations of the standard suction nozzle, specifically the wiping and rotating cleaning body in front and the scraping and rotating cleaning body behind it, viewed from the side. [Figure 6] This is a conceptual bottom view of a standard suction nozzle showing the inside of a wiping and rotating cleaning body. [Figure 7] This is a conceptual side view of a case where the brush bristles (brush) of the wiping brush's rotating cleaning body are tilted in the opposite direction to the scraping brush's rotating cleaning body. [Figure 8] This is a conceptual side view of a case where the brush bristles (brush) of the wiping and rotating cleaning body of another example of a wiping brush are inclined in the direction of the scraping and rotating cleaning body of a scraping brush. [Figure 9]It is a conceptual bottom view of the standard suction body of Modification 1. [Figure 10A] It is a conceptual side view of the standard suction body of Modification 2. [Figure 10B] It is a conceptual side view of the standard suction body of another example of Modification 2. [Figure 11] It is a conceptual bottom view showing the inside of the wiping rotary cleaning body of the standard suction body of Modification 3. [Figure 12] It is a conceptual bottom view showing the inside of the wiping rotary cleaning body of the standard suction body of Modification 4. [Figure 13] It is a diagram showing the control current of the main body motor and the control current of the suction motor in Example 2 of the second embodiment.

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described in detail with appropriate reference to the drawings. (First Embodiment) FIG. 1 is a perspective view of a state in which a vacuum cleaner 100 according to an embodiment of the present invention is stored in a support base 70. In the drawings below FIG. 1, the front, rear, left, right, upper, and lower directions as viewed from the cleaner main body 1 are shown.

[0009] The vacuum cleaner 100 of the embodiment can be changed to various usage forms such as a stick state (see FIG. 1) and a handy state with the extension pipe 300 removed for cleaning.

[0010] The stick state of the vacuum cleaner 100 shown in FIG. 1 is a state in which the extension pipe 300 and the standard suction body 200 are connected. The standard suction body 200 is of a power brush type in which rotary brushes (220, 230 (see FIG. 3)) rotate by a suction motor 221 (see FIG. 6) described later. Although the vacuum cleaner 100 of the present embodiment describes a stick-type cleaner, the present invention is applicable to a variety of cleaners such as a canister-type cleaner and a barrel-type cleaner, not limited to this.

[0011] A dust case 2 is detachably attached to the cleaner main body 1. The cleaner main body 1 also includes an introduction pipe 14 that sends air containing dust sucked in from the connection port 10a into the dust case 2. The motor case part 11 houses an electric blower 40 operated by the main body motor 40m and a circuit board 50. When not in use, the electric cleaner 100 is stored in a support base 70 as shown in FIG. 1. The support base 70 includes a base part 71 and a stand part 72.

[0012] The electric cleaner 100 is used by connecting small suction nozzles (accessories), broom-shaped suction nozzles (accessories), extension hoses (accessories), etc., which are not shown in any figure. <Standard suction nozzle body 200>

[0013] FIG. 2 is a top view of the standard suction nozzle body 200. FIG. 3 is a bottom view of the standard suction nozzle body 200. As shown in FIG. 2, the standard suction nozzle body 200 shown in FIG. 1 includes a suction nozzle case 210 that呈略 T 字形状 in a top view and a suction nozzle joint 213 connected to the suction nozzle case 210.

[0014] The suction nozzle case 210 includes a suction nozzle main body 211 that is细长 formed in the left-right direction (width direction) in a top view and a connecting part 212 connected to the suction nozzle joint 213 at the central part of the suction nozzle main body 211 in the left-right direction. A part of an internal flow path S (see FIG. 3) that connects the suction port P (see FIG. 3) and the suction nozzle joint 213 (see FIG. 2) is formed in the connecting part 212.

[0015] Bumpers 211a are provided on the suction nozzle main body 211 shown in FIG. 2 from the front end face to the left and right side faces by insert molding. The bumpers 211a are formed of an elastic material such as rubber or elastomer, or a resin material such as polypropylene. The bumpers 211a ensure airtightness inside the suction nozzle main body 211 during use. Also, when the standard suction nozzle body 200 collides with furniture or the like, it serves as a buffer material to prevent damage to the furniture or the like and absorb the impact on the suction nozzle main body 211.

[0016] The suction nozzle connector 213 includes a first connecting portion 214 that is rotatably connected to the connecting portion 212, and a second connecting portion 215 that is rotatably connected to the first connecting portion 214. The first connecting portion 214, in a top view in Figure 2, has a roughly D-shape and a cylindrical shaft 214a that is connected to the connecting portion 212. The shaft 214a has an axial direction that is in the left-right direction of the suction nozzle body 211, and both ends of the shaft 214a are supported by bearing portions (not shown) formed in the connecting portion 212.

[0017] The first connecting portion 214 is configured to be rotatable from a state approximately parallel to the floor surface (cleaning surface) Y (see Figure 1) to a state approximately perpendicular to it. That is, by rotating the first connecting portion 214 with respect to the suction nozzle case 210 using the shaft 214a as a pivot point, the extension tube 300 can be rotated between a state approximately parallel to the floor surface Y and a state approximately perpendicular to it.

[0018] The second connecting portion 215 shown in Figure 2 is configured to allow the suction nozzle body 211 to rotate relative to the first connecting portion 214. For example, the extension tube 300 can be tilted from a state where it is approximately perpendicular to the floor surface Y to a state where it is approximately parallel to the floor surface Y. The second connecting section 215 is provided with a power supply terminal 215a to which power is supplied. In this embodiment, the power supplied to the standard suction nozzle 200 is supplied from the vacuum cleaner body 1 (see Figure 1) through the extension pipe 300.

[0019] <Wipe-rotating cleaning unit 220 and scraping-rotating cleaning unit 230> Figure 3 is a bottom view of the standard suction nozzle 200. The suction nozzle body 211 (see Figure 2) of the suction nozzle case 210 has a brush chamber Q with a suction opening P on the bottom side (the side facing the floor surface Y of the cleaning surface). The brush chamber Q of the standard suction nozzle 200 includes a wiping rotating cleaning body 220 (first rotating cleaning body) for cleaning a hardwood floor surface Y, and a scraping rotating cleaning body 230 (second rotating cleaning body) for cleaning a carpeted floor surface Y.

[0020] The wiping and rotating cleaning body 220 is a rotating brush that is a cylindrical wiping brush that is long from left to right and has a large outer diameter. The wiping and rotating cleaning body 220 is rotatably supported within the brush chamber Q via bearings, ball bearings, etc., which are made of highly sliding resin or the like. The scraping and rotating cleaning body 230 is a rotating brush that is a cylindrical scraping bristles that are long from side to side and have a smaller outer diameter than the wiping and rotating cleaning body 220. The wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 are positioned in contact with each other and pressed together so that rotational force is transmitted between them.

[0021] The wiping and rotating cleaning body 220 is driven by the suction motor 221 (see Figure 6). Then, the scraping and rotating cleaning body 230 is rotated by the frictional force with the wiping and rotating cleaning body 220. The scraping and rotating cleaning body 230 has a smaller outer diameter than the wiping and rotating cleaning body 220. The scraping and rotating cleaning body 230 rotates at high speed due to the frictional force with the wiping and rotating cleaning body 220. Therefore, bearings are important for the scraping and rotating cleaning body 230 to improve cooling performance against frictional heat at the shaft and to increase the rotational speed.

[0022] Therefore, the scraping and rotating cleaning body 230 is rotatably supported within the brush chamber Q via bearings or ball bearings made of metal, highly sliding resin, etc. Examples of metal bearings include sintered bearings. Examples of highly sliding resin bearings include polyacetal polyoxymethylene (POM, trade name: Duracon), which has excellent mechanical properties. The bearings of the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 are not limited and can be arbitrarily selected as long as they enable smooth rotational movement of each.

[0023] Figure 4A is a conceptual schematic diagram showing the brush bristles 230k of the scraping rotary cleaning body 230. Figure 4B is a conceptual schematic diagram showing the brush bristles 220k of the wiping rotary cleaning body 220. The wiping and scraping rotating cleaning units 220 and 230 consist of two types of rotating cleaning units with different brush bristles (brush bristles 220k and 230k). The scraping and rotating cleaning unit 230 plays the role of thoroughly scraping up dust and dirt. Thick, long brush bristles 230k are provided (planted) on the outer surface 230a of the scraping and rotating cleaning body 230. The thickness of each individual brush bristle is such that brush bristles 220k < brush bristles 230k.

[0024] As shown in Figure 4A, the brush bristles 230k of the scraping and rotating cleaning body 230 have a loop shape at their tip 230k1. The brush bristles 230k of the scraping and rotating cleaning body 230 are thick and long. In this way, the scraping and rotating cleaning body 230 constitutes a scraping brush. By making the brush bristles 230k of the scraping and rotating cleaning body 230 loop-shaped, entanglement of hair and other materials is suppressed.

[0025] As shown in Figure 3, the brush bristles 230k of the scraping and rotating cleaning body 230 are grouped together to form a brush body 230K. The brush body 230K of the scraping and rotating cleaning body 230 is formed in a spiral shape to increase friction with the wiping and rotating cleaning body 220. On the other hand, the wiping and rotating cleaning body 220 plays the role of guiding the dust scraped up by the scraping and rotating cleaning body 230 to the suction port P. The wiping and rotating cleaning body 220 has thin, short brush bristles 220k (see Figure 4B) on its outer surface 220a.

[0026] Since the brush bristles 220k of the wiping and rotating cleaning body 220 are thinner and shorter than the brush bristles 230k of the scraping and rotating cleaning body 230 shown in Figure 4A, the wiping and rotating cleaning body 220 constitutes a wiping brush. As shown in Figure 4B, the brush bristles 220k of the wiping and rotating cleaning body 220 can also have a loop shape at their tip 220k1. By making the brush bristles 220k of the wiping and rotating cleaning body 220 loop-shaped, entanglement of hair and other debris is suppressed. Furthermore, the loop-shaped tip 230k1 of the brush bristles 230k of the scraping rotating cleaning body 230, which is a scraping brush, is positioned lower than the tip 220k1 of the brush bristles 220k of the wiping rotating cleaning body 220, which is a wiping brush.

[0027] This configuration allows the user to clean carpets or hardwood floors by pressing the standard suction nozzle 200's scraping and wiping cleaning body 230 and wiping and wiping cleaning body 220 against the floor surface Y, thereby improving the cleaning performance of the scraping and wiping cleaning body (scraping brush) 230 on carpets with long piles while suppressing a decrease in the operability of the wiping and wiping cleaning body (wiping brush) 220.

[0028] Figure 5 is a conceptual diagram showing the cleaning operations of the standard suction nozzle 200, specifically the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230, viewed from the side. In this case, placing the suction motor inside the rotating brush of the standard suction nozzle 200 increases the diameter, and the suction size of the standard suction nozzle 200 also increases. In contrast, by placing the suction motor inside the wiping rotating cleaning body 220, which has short brush bristles (brush bristles 220k), the increase in the suction size of the standard suction nozzle 200 can be suppressed. Therefore, the suction motor 221 (see Figure 6), which is the suction motor for the suction nozzle of the wiping and rotating cleaning body 220, is housed inside the wiping and rotating cleaning body 220 shown in Figure 3.

[0029] The suction motor 221 drives the wiping and rotating cleaning body 220, and the frictional force of static and dynamic friction between the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 causes the scraping and rotating cleaning body 230 to rotate in a driven manner. As shown in Figure 5, the rotation of the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 allows fine particles b such as pollen and dust to be sucked into the suction port P by the brush bristles 220k of the wiping and rotating cleaning body 220 and the brush bristles 230k of the scraping and rotating cleaning body 230.

[0030] Figure 6 is a conceptual bottom view of a standard suction nozzle 200 showing the inside of the wiping and rotating cleaning body 220. The cleaning unit 220 contains a suction motor 221, a rotation transmission jig 222, and a brush rotating body 223. The rotation transmission jig 222 and the brush rotating body 223 are resin molded products, and are injection molded using materials such as PS (polystyrene) and PP (polypropylene). The brush rotating body 223 constitutes the outer circumferential surface 220a of the wiping and rotating cleaning body 220. Thin, short brush bristles 220k are provided on the outer circumferential wall 220a.

[0031] The suction motor 221 uses a DC brushless motor with a stator consisting of coils (such as 3-pole or 4-pole) and a rotor made of permanent magnets such as ferromagnetic materials like cobalt or ferrite. The material of the rotor's permanent magnets can be arbitrarily selected, but a material with strong magnetism is preferred because it increases the motor's torque. As shown in Figure 6, the suction motor 221 is fixed to one side cover 210y1 of the suction case 210 of the standard suction body 200. The rotation transmission jig 222 and the brush rotating body 223 are rotatably supported on the other side cover 210y2 of the suction case 210 of the standard suction body 200.

[0032] Note that the suction motor 221 may be other motors such as induction motors, not just DC brushless motors. Sound-absorbing material 221s is wound around the suction motor 221 to absorb motor noise. The sound-absorbing material 221s is made using, for example, sponge, porous material, butyl rubber, or urethane foam. The sound-absorbing material 221s can reduce the noise generated by the suction motor 221.

[0033] The rotational transmission jig 222 shown in Figure 6 has a disc-shaped flywheel 222a and, for example, a cross-shaped convex fitting portion 222b. The flywheel 222a is connected to the rotating shaft of the suction motor 221 and is directly driven by the suction motor 221. Direct drive of the rotation transmission jig 222 and the brush rotating body 223 by the suction motor 221 eliminates the need for pulleys, gears, etc., which are the transmission mechanism (reduction mechanism) of the suction motor 221, thus reducing weight.

[0034] Furthermore, by eliminating pulleys and gears, the suction motor 221, which is a source of noise, can be covered by the wiping and rotating cleaning body 220, thereby reducing noise. By controlling the motor power (∝torque × rotational speed) of the suction motor 221 to three times its original value and the rotational speed to one-third of its original value, the generation of unpleasant high-frequency noise can be suppressed. The brush rotating body 223 has a concave fitting portion 223a and a rotating cylindrical body 223b. The concave fitting portion 223a is configured to fit with the convex fitting portion 222b of the rotation transmission jig 222. As a result, the rotation of the convex fitting portion 222b of the rotation transmission jig 222 causes the concave fitting portion 223a to rotate, thereby driving the brush rotating body 223 to rotate.

[0035] As shown in Figure 5, since the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 are in contact with each other, the rotational force of one wiping and rotating cleaning body 220 causes the other scraping and rotating cleaning body 230 to rotate. In this way, the rotational force of one of the wiping and rotating cleaning bodies 220 causes the other scraping and rotating cleaning body 230 to rotate. The dust scraped by the scraping rotating cleaning body 230 is guided to the suction port P (see Figure 5) by the wiping rotating cleaning body 220, making the floor surface Y "smooth and shiny". Examples of dust include pollen, dust, and sand with a particle size of approximately 3 μm.

[0036] Since the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 are pressed against each other and in contact, the brush bristles of the wiping and rotating cleaning body 220 and the brush bristles of the scraping and rotating cleaning body 230 rub against each other. This causes dust and dirt adhering to the brush bristles 220k of the wiping and rotating cleaning body 220 and 230k of the scraping and rotating cleaning body 230 to be brushed off and collected at the suction port P (see Figure 5). This refreshes and cleans the brush bristles 220k of the wiping and rotating cleaning body 220 and 230k of the scraping and rotating cleaning body 230.

[0037] <Direction of the brush bristles (brush) 220k of the wiping and rotating cleaning unit 220> If the brush bristles 220k of the wiping and rotating cleaning body 220 are positioned perpendicular to the rotation axis of the wiping and rotating cleaning body 220, in other words, perpendicular to the outer surface of the wiping and rotating cleaning body 220, then, as shown in Figure 5, the brush bristles 220k may wear down due to contact between the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230. Therefore, as shown in Figure 7, the brush bristles 220k of the wiping and rotating cleaning body 220 are tilted in the opposite direction to the scraping and rotating cleaning body 230, thereby reducing the frictional force applied to the brush bristles 220k and suppressing wear of the brush bristles 220k.

[0038] Figure 7 is a conceptual side view of the case where the brush bristles (brush) 220k of the wiping brush's rotating cleaning body 220 are tilted in the opposite direction to the scraping brush's rotating cleaning body 230. Figure 8 is a conceptual side view of another example where the brush bristles (brush) 220k of the wiping and rotating cleaning body 220 of a wiping brush are inclined in the direction of the scraping and rotating cleaning body 230 of a scraping brush.

[0039] As shown in Figure 8, when the brush bristles 220k of the wiping and rotating cleaning body 220 are tilted in the direction of the scraping and rotating cleaning body 230, the frictional resistance (frictional force) between the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 increases, making it easier for the wiping and rotating cleaning body 220 to rotate. In other words, as the resistance between the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230 increases, the wiping and rotating cleaning body 220 can rotate the scraping and rotating cleaning body 230 with less loss due to the frictional force between them. As a result, the 220 brush bristles (brush) of the wiping brush can penetrate more deeply into the floor surface Y. Therefore, it has the effect of improving the cleaning performance of carpets with long piles.

[0040] <Effects and Effects> With the above configuration, the suction motor 221 is housed inside the wiping and rotating cleaning body 220, which makes the vacuum cleaner 100 quieter. Furthermore, by covering the area around the suction motor 221 with sound-absorbing material 221s, further noise reduction is possible. Furthermore, as shown in Figure 7, the frictional force applied to the brush bristles 220k of the wiping and rotating cleaning body 220 can be reduced by tilting them in the opposite direction to the scraping and rotating cleaning body 230. Based on the above, we can provide a vacuum cleaner 100 that offers improved cleaning performance and quieter operation.

[0041] <Example 1> Figure 9 is a conceptual bottom view of the standard suction nozzle 200A of modified example 1. The standard suction nozzle 200A of the modified example 1 has multiple or one flexible elastic blades 230b between the spiral brush bristles 230k of the scraping and rotating cleaning body 230A. The other components are the same as in the first embodiment, so the same reference numerals are used for similar components, and detailed descriptions are omitted.

[0042] The blade 230b has, for example, a flat, elongated strip shape and is spirally arranged around the outer circumference of the scraping and rotating cleaning body 230A. The blade 230kb is formed using an elastic material such as natural rubber, butadiene rubber, or elastomer. The material of the blade 230b can be arbitrarily selected. According to Modification 1, a blade 230b is added to the scraping and rotating cleaning body 230, so that the blade 230b scrapes the floor surface Y (see Figure 1) such as carpet, increasing the ability to scrape out dust, debris, etc. scattered on the floor surface Y such as carpet, and improving cleaning performance.

[0043] <Example 2 and other examples> Figure 10A is a conceptual side view of the standard mouthpiece 200B of modified example 2. In the modified example 2, the standard suction nozzle 200B has the rotation axis 220j of the wiping and rotating cleaning body 220 brought closer to the scraping and rotating cleaning body 230 using an elastic material 239 such as a tension coil spring. The rotation axis 220j of the wiping and rotating cleaning body 220 is guided to move in a straight line by a linear guide 220g.

[0044] The wiping and rotating cleaning body 220 is brought closer to the scraping and rotating cleaning body 230 by the elastic force of the elastic material 239. This suppresses a decrease in the rotational force of the wiping and rotating cleaning body 220 on the driven wheel, even if wear occurs on the brushes (brush bristles 220k, brush bristles 230k) of the wiping and rotating cleaning body 220 and the scraping and rotating cleaning body 230.

[0045] Figure 10B is a conceptual side view of another example of the standard mouthpiece 200B1 in Modification Example 2. As shown in another example of Modification 2 in Figure 10B, the rotation axis 230j of the scraping rotating cleaning body 230 is guided to move in a linear motion by the linear guide 230g. The rotation axis 230j of the scraping rotating cleaning body 230 is brought closer to the wiping rotating cleaning body 220 using an elastic material 240 such as a compression coil spring. This suppresses a decrease in the rotational force of the driven wiping rotating cleaning body 220 even if wear occurs on the brushes (brush bristles 220k, brush bristles 230k) of the wiping rotating cleaning body 220 and the scraping rotating cleaning body 230. It should be noted that, by changing the configuration in which external forces are applied to the rotating shafts 220j and 230j, respectively, other elastic materials such as torsion coil springs, leaf springs, compression coil springs, and tension coil springs may also be used for elastic materials 239 and 240.

[0046] <Variation 3> Figure 11 is a conceptual bottom view showing the inside of the wiping and rotating cleaning body 220C of the standard suction body 200C of Modification 3. When the suction motor 221 is in operation, it becomes hot due to Joule heating of the coil, frictional heat between motor components, etc. Therefore, in modified example 3, a cooling fan 221f is fixed to the rotating shaft 221j of the suction motor 221. As a result, the cooling fan 221f rotates when the suction motor 221 is in operation, and the suction motor 221, whose temperature has risen, can be cooled using convection of the surrounding air.

[0047] By installing a cooling fan 221f inside the wiping and rotating cleaning body 220C, the temperature rise of the vacuum cleaner 100 can be suppressed. <Modification 4>

[0048] Figure 12 is a conceptual bottom view showing the inside of the wiping and rotating cleaning body 220D of the standard suction nozzle body 200D of Modification 4. When the suction motor 221 is in operation, it becomes hot due to Joule heating of the coil, frictional heat between components, etc. Therefore, in modified example 4, a pump (cooling unit) 221p is fixed to the rotating shaft 221j of the suction motor 221. A pipeline (cooling unit) not shown is connected to the pump 221p, and fluid flows through the pipeline. The pipeline is provided with fins to increase the heat dissipation area and promote heat dissipation from the fluid.

[0049] Alternatively, instead of the pump 221p, a compressor 221c is connected to the rotating shaft 221j of the suction motor 221. A refrigeration cycle (not shown) through which a refrigerant circulates is connected to the compressor 221c. The suction motor 221 is cooled by the latent heat of vaporization through heat exchange between the suction motor 221 and the evaporator (not shown) of the refrigeration cycle. By placing the cooling section of the refrigeration cycle, including the pump 221p and the compressor 221c, inside the wiping and rotating cleaning body 220D, it is possible to suppress the suction motor 221 from becoming overheated.

[0050] (Second Embodiment) The second embodiment suppresses the noise of the vacuum cleaner 100. Examples 1 to 4 will be described as a second embodiment.

[0051] <Example 1> Noise is reduced by suppressing noise within the user's audible range (20-20,000 Hz). Specifically, the lower the frequency band is below the audible range (20-20,000 Hz), and the higher the frequency band is above the audible range, the less audible the sound becomes to the human ear. Therefore, the circuit board 50 (see Figure 1) controls the rotation speed of the main motor 40m (see Figure 1) and the suction motor 221 (see Figure 6) of the electric blower 40 of the vacuum cleaner 100 so that they differ as much as possible from the frequency range of human hearing. This reduces noise.

[0052] <Example 2> Figure 13 shows the control current 40mi for the main motor 40m and the control current 221i for the suction motor 221 in Example 2 of the second embodiment. As shown in Figure 13, the rotational speed (frequency) and phase of the suction motor 221 and the main motor 40m are adjusted by the circuit board 50 (see Figure 1) so that their respective noises cancel each other out. Specifically, the frequency of the control current 221i of the suction motor 221 and the frequency of the control current 40mi of the main motor 40m are controlled to be the same or approximately the same, and in opposite or approximately opposite phase.

[0053] As a result, the noise from the main motor 40m and the noise from the suction motor 221 cancel each other out, suppressing the noise audible to humans. As another example, the control unit of a smartphone controls the sound generated by a vacuum cleaner 100 to be picked up by the smartphone's microphone. Then, similar to Figure 13, the control unit of the smartphone emits a sound of the same frequency or approximately the same frequency with opposite or approximately opposite phase that cancels out the sound from the speaker, or a control unit of a device other than the smartphone plays it through earphones or speakers.

[0054] Alternatively, a communication unit capable of communicating with multiple home appliances (for example, a vacuum cleaner 100, a washing machine, an air conditioner, etc.) is pre-installed on the circuit board 50 (see Figure 1). Then, while the washing machine or air conditioner is in operation, the circuit board 50 (see Figure 1) receives control signals from the washing machine or air conditioner via the communication unit. Then, in a manner similar to that shown in Figure 13, the circuit board 50 (see Figure 1) of the vacuum cleaner 100 controls the rotation speed of the main motor 40m and the suction motor 221 of the vacuum cleaner 100 to be the same as or approximately the same as the operating frequency of the washing machine or air conditioner, and controls the operating phase of the main motor 40m and the suction motor 221 of the vacuum cleaner 100 to be in opposite phase or approximately opposite phase to the operating phase of the washing machine or air conditioner. This method allows for noise reduction, for example, by operating the vacuum cleaner 100 while the washing machine or air conditioner is in operation.

[0055] <Example 3> It is said that sounds around 3000 Hz are easily audible to the human ear. In other words, sounds with a frequency around 3000 Hz are easily heard by the human ear and are likely to stimulate dopamine secretion. Therefore, the operating frequency of the main motor 40m and the operating frequency of the suction motor 221 are adjusted to around 3000 Hz, a frequency range that is pleasant to the human ear, using the circuit board 50 (see Figure 1). This makes it possible to create a vacuum cleaner 100 with a pleasant operating noise.

[0056] <Example 4> The sound produced by the main motor 40m (see Figure 1) of the vacuum cleaner 100 and the sound produced by the suction motor 221 (see Figure 6) are controlled by the motor sound, which depends on the torque of the frequency and current value, and the fluid sound of the air sucked in by the vacuum cleaner 100, using the circuit board 50 (see Figure 1) to create a musical (melody) effect. Alternatively, using the circuit board 50 (see Figure 1), the sound generated by the vacuum cleaner 100 can be adjusted to mimic the sounds of a mother's womb, thereby controlling the operation of the vacuum cleaner 100 to help infants (babies) fall asleep more easily. According to Example 4, it is possible to provide an electric vacuum cleaner 100 that helps infants (babies) fall asleep easily.

[0057] <<Other Embodiments>> 1. In the first embodiment described above, the case in which the wiping rotating cleaning body 220 is positioned in front and the scraping rotating cleaning body 230 is positioned in the rear was described, but the scraping rotating cleaning body 230 may be positioned in front and the wiping rotating cleaning body 220 may be positioned in the rear. 2. The present invention is not limited to the embodiments and modified configurations described above, and various modified and specific forms are possible within the scope of the appended claims. [Explanation of symbols]

[0058] 1. Vacuum cleaner body 40 Electric blower 40m main motor 100 Electric Vacuum Cleaners 200 Standard suction body (suction body) 220 Wiping Rotating Cleaning Body (First Rotating Cleaning Body) 220g Linear Guide (Interaxial Pressure Welding Method) 220k brush bristles (first brush) 220k1 Brush bristle tip (tip of the first brush) 221 Suction motor (drive motor) 221f Cooling fan (cooling unit) 221p Pump (Cooling Unit) 230. Rotating scraping cleaning body (second rotating cleaning body) 230g Linear Guide (Interaxial Pressure Welding Method) 230k brush bristles (second brush) 230k1 Brush bristle tip (second brush tip) 230K brush body 239 Elastic material (interaxial pressure welding means) 240 Elastic material (interaxial pressure welding means) 50 Circuit board (control unit)

Claims

1. A vacuum cleaner body equipped with an electric blower, The system includes a suction port that sucks up dust using the suction force generated by the electric blower, The suction body comprises a first rotating cleaning body provided with a first brush, and a second rotating cleaning body provided with a second brush having a larger diameter than the first brush. The first rotating cleaning body has a drive motor inside, The second rotating cleaning body has multiple brushes arranged in a spiral shape. The first rotating cleaning body and the second rotating cleaning body are arranged so as to be in contact with each other. A vacuum cleaner characterized by the following features.

2. A vacuum cleaner body equipped with an electric blower, The system includes a suction port that sucks up dust using the suction force generated by the electric blower, The aforementioned mouthpiece body is It comprises a first rotating cleaning body provided with a first brush, and a second rotating cleaning body provided with a second brush having a larger diameter than the first brush, The first rotating cleaning body has a drive motor inside. A vacuum cleaner characterized by the following features.

3. In the vacuum cleaner according to claim 1 or claim 2, The second brush of the second rotating cleaning body is loop-shaped, The tip of the second brush of the second rotating cleaning body is positioned lower than the tip of the first brush of the first rotating cleaning body. A vacuum cleaner characterized by the following features.

4. In the vacuum cleaner according to claim 3, The first brush of the first rotating cleaning body is inclined in the opposite direction to the second rotating cleaning body. A vacuum cleaner characterized by the following features.

5. In the vacuum cleaner according to claim 3, The first brush of the first rotating cleaning body is inclined in the direction of the second rotating cleaning body. A vacuum cleaner characterized by the following features.

6. In the vacuum cleaner according to claim 1, The outer diameter of the first rotating cleaning body is larger than the outer diameter of the second rotating cleaning body. A vacuum cleaner characterized by the following features.

7. In the vacuum cleaner according to claim 1 or claim 2, The first rotating cleaning body has a cooling unit inside for cooling the drive motor. A vacuum cleaner characterized by the following features.

8. In the vacuum cleaner according to claim 1 or claim 2, The system includes an interaxial pressure means that applies an external force to bring the first rotating cleaning body and the second rotating cleaning body closer together. A vacuum cleaner characterized by the following features.

9. In the vacuum cleaner according to claim 1 or claim 2, The main motor that operates the aforementioned electric blower, The system includes a control unit for controlling the aforementioned vacuum cleaner, The control unit controls the drive motor and the main motor so that their frequencies are the same or approximately the same, and their phases are opposite or approximately opposite. A vacuum cleaner characterized by the following features.

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