CN117281417A

CN117281417A - Electric dust collector

Info

Publication number: CN117281417A
Application number: CN202310348534.2A
Authority: CN
Inventors: 大下悟
Original assignee: Toshiba Lifestyle Products and Services Corp
Current assignee: Toshiba Lifestyle Products and Services Corp
Priority date: 2022-06-23
Filing date: 2023-04-04
Publication date: 2023-12-26
Also published as: JP2024002258A

Abstract

The invention provides an electric dust collector which can be conveniently used irrespective of the type of a dust collection object surface. The electric vacuum cleaner includes a first detecting unit for detecting the type of the suction target surface and a second detecting unit for detecting the traveling direction of the suction port body. In the case of the first type of surface to be cleaned having a large contact resistance with the first and second rotary cleaning elements, the first and second rotary cleaning elements are rotated so as to assist the travel of the suction port body in the traveling direction by the contact resistance between the first rotary cleaning element and the second rotary cleaning element. In the case of the second type of surface to be cleaned having a small contact resistance, the first and second rotary cleaning elements are rotated in opposite directions to each other so that the propulsive force applied to the suction port body by the contact resistance of each of the first and second rotary cleaning elements is balanced.

Description

Electric dust collector

Technical Field

Embodiments of the present invention relate to an electric vacuum cleaner.

Background

There is currently an electric vacuum cleaner having two rotary cleaning elements incorporated in a suction port body provided with a suction port. Patent document 1 discloses an electric vacuum cleaner in which rotary cleaning elements are disposed in the left and right directions with respect to the center of a suction port, and the rotary cleaning elements are supported in a cantilever state with respect to a housing of the suction port.

As another electric vacuum cleaner other than the above, there is an electric vacuum cleaner in which a rotary cleaning body is disposed in the suction port body in front of and behind the suction port with respect to the traveling direction. According to such an electric vacuum cleaner, the front and rear rotary cleaning bodies are rotated in opposite directions to each other, whereby dust deposited on the surface to be cleaned can be more effectively cleaned and urged to move toward the suction port.

Patent document 1: japanese patent application laid-open No. 2021-194377

However, in the case of cleaning a floor surface on which a floor surface such as a carpet is laid, unlike the case of cleaning a floor surface such as a wooden floor or a tatami, resistance to the rotating cleaning element from the surface to be cleaned during operation thereof, that is, contact resistance to the rotating cleaning element with respect to the surface to be cleaned increases, and resistance to the movement of the suction port body increases. Then, the tendency is promoted by rotating the front and rear rotary cleaning bodies in opposite directions, and the operation of the suction port body becomes heavy, and the operability is deteriorated, which may hinder the usability of the electric vacuum cleaner.

Disclosure of Invention

Accordingly, an object of the present invention is to provide an electric vacuum cleaner which can be used more conveniently regardless of the type of the surface to be cleaned.

In order to solve the above problems, an electric vacuum cleaner according to an embodiment of the present invention includes a suction port body, a cleaner body, and a control unit. The suction port body includes: a housing formed with a suction port; a first rotary cleaning element which is disposed on the front and rear sides of the suction port and rotatably supported by the housing, and which has a first outer peripheral portion which contacts the surface to be cleaned when cleaning; a second rotary cleaning element which is disposed on the other side of the suction port in parallel with the first rotary cleaning element, is rotatably supported by the housing, and has a second outer peripheral portion which contacts the surface to be cleaned when cleaning; a first motor configured to be capable of driving the first rotary cleaning element; and a second motor provided to be capable of driving the second rotary cleaning body independently of the first rotary cleaning body, wherein the cleaner body has a dust collection unit configured to collect dust sucked through the suction port. The control unit includes a first detection unit that detects a type of the suction target surface, and a second detection unit that detects a traveling direction of the suction port body, and rotates the first and second rotary cleaning bodies so that the contact resistances of the first and second rotary cleaning bodies and the contact resistances of the first and second rotary cleaning bodies assist traveling of the suction port body in the traveling direction when the suction target surface is a first suction target surface having a contact resistance larger than a predetermined value, and rotates the first and second rotary cleaning bodies so that the thrust forces applied to the suction port body by the first and second rotary cleaning bodies are balanced when the suction target surface is a second suction target surface having a contact resistance smaller than the predetermined value.

The invention has the advantages that: according to the electric dust collector of the invention, the electric dust collector can be used conveniently irrespective of the type of the dust collection object surface.

Drawings

Fig. 1 is a perspective view showing the overall configuration of an electric vacuum cleaner according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a suction port body provided in the electric vacuum cleaner according to the above embodiment, when viewed from the left oblique front side with respect to the advancing direction.

Fig. 3 is a top plan view showing the same upper suction port as viewed from above.

Fig. 4 is an exploded plan view showing the upper casing with the upper suction port body in a state where the upper casing of the main body is detached.

Fig. 5 is a bottom view of the upper suction port body as seen from below.

Fig. 6 is a sectional view of the suction port body based on the line A-A shown in fig. 3 as above.

Fig. 7 is a sectional view of the suction port body based on the line B-B shown in fig. 3 as above.

Fig. 8 is a perspective view showing a suction port body provided in an electric vacuum cleaner according to another embodiment of the present invention in a state of being viewed from the left oblique front with respect to the advancing direction.

Fig. 9 is a plan view of the same upper suction port body as viewed from above.

Fig. 10 is a bottom view of the upper suction port body as seen from below.

Fig. 11 is a side view of the same upper suction port body as seen from the left.

Fig. 12 (a) and (b) are schematic diagrams schematically showing the configuration of the first and second detection units provided in the suction port body.

Description of the reference numerals

The vacuum cleaner comprises a vacuum cleaner body, a main body 11, a main body 111, a main body connecting part, a holding part 112, an operating part 113, an electric blower 12, a dust collecting part 13, a main body 14 control part 15, a secondary battery, a suction inlet body 2, a housing 21, a suction inlet 21, a housing upper part 211, a housing lower part 212, a housing inner wall 213, a first rotary cleaning body 221, a second rotary cleaning body 222, a first motor 231, a second motor 232, a first power transmission body 241, a second power transmission body 242, a front supporting wheel 27a and a rear supporting wheel 28, an extension tube 3, a control part 301, a rotary roller 311, a first reflecting roller 312a, a second reflecting roller 312b, a first photoelectric sensor 321a, a second photoelectric sensor 321b, a reflecting surface s1, a non-reflecting surface s2, a first brush chamber R11, a second brush chamber R12, a first motor chamber R21, a second motor chamber R22, a first belt chamber R31, and a second belt chamber R32.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(integral construction of electric vacuum cleaner)

Fig. 1 is a perspective view showing the overall configuration of an electric vacuum cleaner C according to an embodiment of the present invention.

In the present embodiment, the electric vacuum cleaner C is a so-called stick type vacuum cleaner, and includes a cleaner main body 1, a suction port body 2, and an extension pipe 3. The cleaner body 1 includes an electric blower 12 and a dust collection unit 13 in a body case 11. The vacuum cleaner C transmits the negative pressure generated by the electric blower 12 to the suction port body 2 via the extension tube 3, sucks dust present on the suction target surface F into the suction port body 2, sucks dust sucked into the suction port body 2 into the cleaner body 1 via the extension tube 3, and deposits the dust in the dust collecting portion 13 of the cleaner body 1. The cleaning target surface F is, for example, a floor surface of a house.

The air containing dust sucked into the suction port body 2 is referred to as "dust-containing air" herein. The dust-containing air sucked into the cleaner body 1 is separated into air and dust by the dust collecting portion 13, the dust is accumulated in the dust collecting portion 13, and the air is discharged to the outside of the cleaner body 1 from an exhaust port (not shown) provided in the body case 11 through the electric blower 12 by passing through the dust collecting portion 13.

In the cleaner body 1, a main body case 11 has a housing chamber of an electric blower 12, and a main body connection portion 111 having an inflow port formed therein, and a flow passage (not shown) extending from the inflow port to an exhaust port via a dust collection portion 13 is formed therein. The main body casing 11 includes a grip 112 that can be held by a user when the user uses the electric vacuum cleaner C to perform suction, an operation unit 113 is provided at or near the grip 112, and the main body control unit 14 is incorporated therein. Fig. 1 schematically shows the outline of the electric blower 12 and the main body control unit 14 by broken lines.

The operation unit 113 is provided in a range that can be operated by the remaining thumb in a state where the user grips the grip unit 112 with 4 fingers other than the thumb, and transmits an electric signal corresponding to the operation of the user to the main body control unit 14. In the present embodiment, the operation unit 113 includes an operation start switch 113a, an operation mode switching switch 113b, and a brush operation switch 113C, and the operation start switch 113a switches the operation and the stop of the electric vacuum cleaner C, and the operation mode switching switch 113b switches the load of the electric blower 12, that is, the flow rate of air sucked through the suction port body 2. The brush operation switch 113c is configured to switch the operation and the stop of the rotary cleaning elements 221 and 222 by switching on and off the power supply to the motors 231 and 232 described later.

The main body control unit 14 is mounted as a control circuit board on the cleaner main body 1, and is disposed in a housing chamber provided in the main body case 11. The main body control unit 14 includes a microprocessor, an input/output interface, and various storage devices, executes a predetermined operation stored in advance based on electric signals from the operation unit 113 and various sensors, and generates command signals.

In the present embodiment, the main body control unit 14 performs control to switch the operation modes of the motors 231 and 232 according to the type of the surface F to be cleaned, particularly when the brush operation switch 113c is turned on and the rotary cleaning elements 221 and 222 are operated to perform cleaning. The main body control unit 14 corresponds to the "control unit" of the present embodiment.

The dust collection unit 13 is detachable from the main body case 11, and separates dust-containing air sucked into the cleaner main body 1 through the suction port body 2 into air and dust by centrifugal separation, for example, using a difference in mass, and collects the dust. The dust collected by the dust collection unit 13 can be discarded by detaching the dust collection unit 13 from the main body case 11.

In addition to the above, the cleaner body 1 includes the secondary battery 15 as a power source. The secondary battery 15 is housed in the main body casing 11, and stores electric power supplied to the electric blower 12 and the main body control unit 14. In the present embodiment, the secondary battery 15 is detachable from the main body case 11, and in a state of being attached to the main body case 11, electric power is supplied to the electric blower 12 and the like via terminals provided in the main body case 11.

The electric blower 12 is disposed in a housing chamber formed in the cleaner body 1, and operates with the secondary battery 15 as a power source. The electric blower 12 includes a housing, a fan, and a motor, and the fan and the motor are integrally housed in the housing. The electric blower 12 receives a command signal from the main body control unit 14, and the motor is operated in accordance with the command signal, whereby the fan is rotated by the rotational power thereof, and a negative pressure is generated in the suction port body 2.

The suction port body 2 is also called a cleaner head, and has a suction port 21a through which dust-containing air passes when dust deposited on the suction target surface F is sucked. The suction port body 2 houses the rotary cleaning elements 221 and 222, and incorporates motors 231 and 232 as driving sources of the rotary cleaning elements 221 and 222, and power transmission elements 241 and 242 for transmitting rotational power to the rotary cleaning elements 221 and 222.

In the present embodiment, a pair of rotary cleaning bodies 221, 222, motors 231, 232, and power transmission bodies 241, 242 are provided, respectively. The pair of rotary cleaning elements (first rotary cleaning element 221 and second rotary cleaning element 222) are brought into contact with the surface F to be cleaned by the outer peripheral portions 221a and 222a, respectively, with the suction port body 2 placed on the surface F to be cleaned. Then, the rotating cleaning bodies 221 and 222 are rotated, and the outer peripheral portions 221a and 222a of the rotating cleaning bodies sweep out dust on the surface F to be cleaned, thereby promoting movement of the dust from the surface F to be cleaned toward the suction port 21a.

The extension tube 3 is interposed between the cleaner body 1 and the suction port body 2, and connects the suction port body 2 to the cleaner body 1 such that the negative pressure generated by the electric blower 12 acts on the suction port 21a of the suction port body 2. In other words, the extension pipe 3 fluidly connects the suction port 21a of the suction port body 2 and the flow passage inside the casing 21 to the inflow port of the main body casing 11. In the present embodiment, the extension pipe 3 is formed in an elongated tubular shape from a synthetic material such as hard plastic, and is detachable from the cleaner body 1 and the suction port body 2, respectively. Here, the connection portion 25 is an element attached to the suction port body 2, but the extension pipe 3 and the connection portion 25 constitute the "air path body" of the present embodiment in explanation. The joint 26 described later corresponds to a "connection portion" of the air passage body to the suction port body 2.

The electric vacuum cleaner C can be used not only as a stick-type vacuum cleaner, but also as a hand-held vacuum cleaner by removing the extension tube 3 from the vacuum cleaner body 1 and directly attaching the suction port body 2 to the vacuum cleaner body 1.

(constitution of suction port body)

Fig. 2 is a perspective view showing the suction port body 2 of the electric vacuum cleaner C according to the present embodiment, as viewed from the left oblique front side with respect to the advancing direction. Fig. 3 is a plan view showing the suction port body 2 in a state of being seen from above, fig. 4 is an exploded plan view showing the suction port body 2 in a state of having the housing upper portion 211 of the housing 21 removed, and fig. 5 is a bottom view showing the suction port body 2 in a state of being seen from below.

As shown in fig. 2, the term "front" or "forward" refers to the front or front with respect to the advancing direction of the suction port body 2, and the term "rear" or "rear" refers to the rear or rear with respect to the advancing direction of the suction port body 2. The "forward direction" of the suction port body 2 refers to a direction in which the suction port body 2 travels when the grip 112 of the cleaner body 1 is gripped and the suction port body 2 is pushed forward via the extension tube 3.

Similarly, with respect to the suction port body 2, "right" or "right" means right or right with respect to the advancing direction of the suction port body 2, and "left" or "left" means left or left with respect to the advancing direction of the suction port body 2. The term "upper" or "upper" means upper or upper in the vertical direction. In a state where the suction port body 2 is placed on the suction target surface F, the upper surface of the housing 21 of the suction port body 2 faces upward. "lower" or "lower" refers to vertically lower or lower. The rear surface 21r of the housing 21 of the suction port body 2 faces downward in a state where the suction port body 2 is placed on the suction target surface F.

When referred to as the "traveling direction" of the suction port body 2, the "traveling direction" includes both the direction when the suction port body 2 moves forward and the direction when the suction port body moves backward. That is, the "traveling direction" and the "traveling direction" are different concepts, and the traveling direction of the suction port body 2 can be changed to the traveling direction when the suction port body 2 is traveling, and the retreating direction of the suction port body 2 can be changed to the traveling direction when the suction port body 2 is retreating.

Fig. 6 is a sectional view of the suction port body 2 based on the line A-A shown in fig. 3, and fig. 7 is a sectional view of the suction port body 2 based on the line B-B shown in fig. 3. The line A-A overlaps with a center line (hereinafter referred to as "center line of the suction port body") bisecting the suction port body 2 in the left-right direction in the vertical direction.

The structure of the suction port body 2 will be further described with reference to fig. 2 to 5, with appropriate reference to fig. 6 and 7.

The suction port body 2 has a suction port 21a, and the suction port 21a is capable of running or sliding on the suction target surface F, and is oriented toward the suction target surface F in a state of being used for suction, that is, in a state where the rear surface 21r of the housing 21 of the suction port body 2 is opposed to the suction target surface F in the present embodiment, the rear surface of the housing lower portion 212. The suction port 21a is formed long in the left-right direction D2 (fig. 3), and is connected to a communication port provided in the substantially center of the suction port body 2 in the left-right direction D2. The suction port 21a is formed in a nozzle shape that narrows a flow path area in a flow direction when the dust-laden air is sucked from the open end toward the communication port.

The suction port body 2 includes a housing 21, rotary cleaning bodies 221, 222, motors 231, 232, power transmission bodies 241, 242, and a connection pipe 25, and a control unit 301 including the motors 231, 232, and the housing 21 includes a housing chamber for housing the rotary cleaning bodies 221, 222, the motors 231, 232, the power transmission bodies 241, 242, and the control unit 301.

In other words, the rotary cleaning elements 221 and 222, the motors 231 and 232, the power transmission bodies 241 and 242, and the control unit 301 are housed in different housing chambers (hereinafter, the housing chambers of the rotary cleaning elements 221 and 222 may be referred to as "brush chambers", the housing chambers of the motors 231 and 232 may be referred to as "motor chambers", and the housing chambers of the power transmission bodies 241 and 242 may be referred to as "belt chambers") in the housing 21. The motors 231 and 232 are not limited to being housed in the casing 21, and may be housed in the rotary cleaning bodies 221 and 222. For example, the rotary cleaning elements 221 and 222 have housing chambers for the motors 231 and 232 formed therein, and the motors 231 and 232 are housed in the housing chambers. The motors 231 and 232 can also be housed in bearings that support the rotation shafts of the rotary cleaning elements 221 and 222.

The housing 21 and the connection pipe 25 are connected to each other via a joint portion 26 provided at a substantially center of the housing 21 in the left-right direction D2, and the connection pipe 25 is swingable left-right about a first axis in the front-rear direction D1 with respect to the housing 21 and rotatable up-down about a second axis perpendicular to the first axis in a state of being connected to the housing 21.

The housing 21 includes a housing upper portion 211, a housing lower portion 212, and a housing inner wall 213 (fig. 6). The housing upper portion 211, the housing lower portion 212, and the housing inner wall 213 are made of the same or different materials as separate members, and are assembled with each other to constitute the housing 21 as a whole. The case upper portion 211, the case lower portion 212, and the case inner wall 213 can be formed separately into appropriate members or portions according to functions of the respective portions, manufacturing conditions, and the like.

For example, the case upper portion 211 can be divided into an intermediate portion 211a located in the middle of the front-rear direction D1 and extending over the entire width of the case upper portion 211, a front cover portion 211b connected to the front with respect to the intermediate portion 211a, and a rear cover portion 211c connected to the rear, and by making the front cover portion 211b and the rear cover portion 211c transmissive, the state of the rotary cleaning body (first rotary cleaning body) 221 covered by the front cover portion 211b can be visually confirmed from the outside, and the state of the rotary cleaning body (second rotary cleaning body) 222 covered by the rear cover portion 211c can be visually confirmed from the outside. Thus, it is possible to confirm that foreign matter such as wire ends is wound around the rotary cleaning elements 221 and 222 housed in the housing 21, and to take measures such as removal of the foreign matter at a proper time.

The case 21 has a rectangular shape that is long in the left-right direction D2 in a plan view as viewed from above, and the case upper portion 211 and the case lower portion 212 each extend over the entire width of the case 21, which is the dimension of the case 21 in the left-right direction D2.

The housing upper portion 211 covers the housing lower portion 212 from above, thereby surrounding the entirety of the housing lower portion 212. Then, the housing upper portion 211 forms an inner space of the housing 21 between the housing lower portion 212 by being combined with the housing lower portion 212. The housing 21 appropriately partitions the internal space by the housing inner wall 213, and performs reinforcement necessary for securing strength.

In the present embodiment, the housing 21 has the suction port 21a, and the communication port, which is a narrow portion of the suction port 21a, is provided in the substantially center of the housing 21 in the left-right direction D2. The interior space of the housing 21 is partitioned by the housing inner wall 213, and thus, in addition to the suction chamber 21b for dust-containing air continuing from the suction port 21a, the housing chambers R1 (R11, R12) for the rotary cleaning elements 221, 222, the housing chambers R2 (R21, R22) for the motors 231, 232, the housing chambers R3 (R31, R32) for the power transmission elements 241, 242, and the housing chamber for the control unit 301 are formed in the housing 21.

As shown in fig. 6, the suction chamber 21b is partitioned by an extension portion that extends forward and rises from a flat portion of the housing lower portion 212 that forms the rear surface 21r of the housing 21, and a housing inner wall 213, and forms a ventilation path inside the housing 21 that continues from the suction port 21 a. The upstream end of the suction chamber 21b is adjacent to the suction port 21a, and is disposed between a pair of rotary cleaning elements 221 and 222 in the present embodiment.

Here, the upstream end of the suction chamber 21b is divided in the front-rear direction D1 by a hanging portion 213a of the housing inner wall 213 and a hanging portion 212a connected to an extended portion of the housing lower portion 212. The hanging portion 213a of the housing inner wall 213 forms a part of the first brush chamber R11 accommodating the first rotary cleaning element 221 provided in front of the suction port 21a among the pair of rotary cleaning elements, and the hanging portion 212a of the housing lower portion 212 forms a part of the second brush chamber R12 accommodating the second rotary cleaning element 222 provided behind the suction port 21 a. In this sense, the hanging parts 212a and 213a can be referred to as partition walls inside the housing 21 that divide the first and second brush chambers R11 and R12.

As shown in fig. 4, the brush chambers R11 and R12, which are the housing chambers for the rotary cleaning elements 221 and 222, are formed as long spaces in the lateral direction D2 that sandwich the suction port 21a from front to back. In the present embodiment, the first brush chamber R11 for accommodating the first rotary cleaning element 221 at the front is formed by the front cover portion 211b of the housing upper portion 211, the hanging portion 213a of the housing inner wall 213, and the portion connected to the front (fig. 6). On the other hand, the second brush chamber R12, which houses the second rotary cleaning element 222, is formed by an extended portion and a hanging portion 212a of the housing lower portion 212.

The housing chambers of the motors 231 and 232, that is, the motor chambers R21 and R22 are formed in the left half and the right half of the housing 21, respectively, as spaces sandwiching the suction chamber 21b from the left and right. With further reference to fig. 7, in the present embodiment, the first motor chamber R21 accommodating the first motor 231 in the left direction and the second motor chamber R22 accommodating the second motor 232 in the right direction are formed by the intermediate portion 211a of the housing upper portion 211 and the housing inner wall 213, respectively, and are separated from the first and second brush chambers R11, R12 by the housing inner wall 213.

The housing chambers of the power transmission body 24, that is, the belt chambers R31 and R32, are formed outside the corresponding motors 231 and 232 in the left-right direction D2 so as to be shifted from each other in the front-rear direction D1. In the present embodiment, the first belt chamber R31 accommodating the first power transmission body 241 corresponding to the first motor 231 is formed so as to be displaced forward with respect to the center of the housing 21 in the front-rear direction D1, and the second belt chamber R32 accommodating the second power transmission body 242 corresponding to the second motor 232 is formed so as to be displaced rearward with respect to the center of the housing 21 in the front-rear direction D1.

The housing chamber R4 of the control unit 301 is formed between the first motor chamber R21 and the second motor chamber R22, and is partitioned from the first and second motor chambers R21 and R22 by the inner walls of the casing supporting the first and second motors 231 and 232, respectively. In the present embodiment, the housing chamber R4 of the control unit 301 is located at the substantially center of the housing 21 in the left-right direction D2, and is overlapped with the center line of the suction port body 2 in the up-down direction.

In addition to the above, as shown in fig. 5, the suction port body 2 includes a pair of front support wheels 27a and 27b and a rear support wheel 28. The support wheels 27a, 27b, 28 support the suction port body 2 on the suction target surface F, and the rear surface 21r of the housing 21 is kept separate from the suction target surface F during suction, thereby promoting smooth running of the suction port body 2 on the suction target surface F. The front support wheels 27a, 27b and the rear support wheel 28 constitute a "support portion" in the present embodiment.

In the present embodiment, the front support wheels 27a, 27b and the rear support wheel 28 are fixed wheels each having a rotation axis oriented in a fixed direction. The rotation axes of the front support wheels 27a, 27b and the rear support wheel 28 are fixed in a direction extending laterally. The front support wheels 27a and 27b are disposed so as to sandwich the suction port 21a from the left and right at the substantial center of the housing 21 in the front-rear direction D1. On the other hand, the rear support wheel 28 is disposed rearward of the housing lower portion 212, specifically, below the connection pipe 25, and rearward of the joint portion 26. In this way, in a state where the rear surface 21r of the case 21 is viewed from below, the front support wheels 27a and 27b and the rear support wheel 28 are positioned at positions corresponding to the apexes of the triangle, and the rear support wheel 28 is disposed at substantially the center of the pair of front support wheels 27a and 27b in the left-right direction D2. In the present embodiment, a sheet (not shown) of a low friction material such as a raised cloth is attached to the outer peripheral surfaces of the front support wheels 27a and 27b and the rear support wheel 28, that is, the surface that contacts the surface F to be cleaned. This reduces frictional resistance when the suction port body 2 is moved in a direction parallel to the rotation axes of the front support wheels 27a, 27b and the rear support wheel 28, in other words, in the left-right direction D2, and thus enables a light and easy operability when cleaning the floor surface of the wooden floor or the like.

(constitution of rotating cleaning element and Power Transmission mechanism)

The rotary cleaning elements, i.e., the first rotary cleaning element 221 and the second rotary cleaning element 222, are formed in a cylindrical shape having a long axial length as a whole, and are housed in the first brush chamber R11 and the second brush chamber R12, which are housing chambers provided in the housing 21. The first and second rotary cleaning elements 221 and 222 each include a rotary shaft having a length that transversely extends in the left-right direction D2 the brush chambers R11 and R12 that house the rotary shaft, and cleaning elements formed in a spiral shape on the outer periphery of the rotary shaft, and are supported by the housing 21 via bearings provided at the shaft ends of the rotary shafts. The first and second rotary cleaning elements 221 and 222 are supported by the housing 21, and the outer peripheral portions 221a and 222a thereof, specifically, the tip ends of the cleaning elements are in contact with the cleaning target surface F.

The first and second rotary cleaning elements 221 and 222 are further provided with pulleys at one axial end. When pulleys provided to motors 231 and 232 described later are set as the driving side, pulleys provided to first and second rotary cleaning elements 221 and 222 are set on the driven side.

The motors, i.e., the first motor 231 and the second motor 232 constitute driving sources for the corresponding rotary cleaning elements 221 and 222, and operate by receiving power supply from the secondary battery 15 provided in the cleaner body 1. The first and second motors 231 and 232 have output shafts that are housed in the first motor chamber R21 and the second motor chamber R22 in parallel with the rotation axes of the rotary cleaning elements 221 and 222, and pulleys are attached to the output shafts. Pulleys provided in the first and second motors 231, 232 are located on the driving side in relation to pulleys provided in the rotary cleaning bodies 221, 222.

The power transmission bodies, that is, the first power transmission body 241 and the second power transmission body 242 are interposed between the corresponding motors 231 and 232 and the rotary cleaning bodies 221 and 222, and the rotational power of the motors 231 and 232 is transmitted to the corresponding rotary cleaning bodies 221 and 222. In the present embodiment, the first and second power transmission bodies 241 and 242 are endless belts, and are mounted on driving pulleys mounted on the motors 231 and 232 and driven pulleys mounted on the rotary cleaning bodies 221 and 222.

In the present embodiment, the first rotary cleaning element or the first rotary brush 221 constitutes a "first rotary cleaning element", and the outer peripheral portion 221a corresponds to a "first outer peripheral portion". The second rotary cleaning element or the second rotary brush 222 constitutes a "second rotary cleaning element", and the outer peripheral portion 222a corresponds to a "second outer peripheral portion".

Further, the first motor or first motor 231 constitutes "a first motor", and the second motor or second motor 232 constitutes "a second motor". The first motor 231 and the second motor 232 can be driven independently of each other, and rotational power is transmitted independently of each other to the corresponding rotary cleaning bodies 221 and 222. That is, in the present embodiment, the control unit 301 can output command signals to the first motor 231 and the second motor 232 independently of each other.

(switching of operation modes of the rotating cleaning element)

As described above, when the brush operation switch 113c is turned on and the first rotary cleaning element 221 and the second rotary cleaning element 222 are operated to perform cleaning, the main body control unit 14 performs control to switch the operation modes of the first and second motors 231 and 232 according to the type of the cleaning target surface F.

As a configuration for realizing this control, in the present embodiment, the main body control unit 14 is provided with a first detection unit for detecting the type of the suction target surface F and a second detection unit for detecting whether the suction port body 2 is moving forward or moving backward in the direction of travel of the suction port body 2.

The first detection unit detects the type of the surface to be cleaned F based on the resistance received from the surface to be cleaned F when the first rotary cleaning element 221 and the second rotary cleaning element 222 are operated, that is, the contact resistance (hereinafter referred to as "contact resistance of the surface to be cleaned with the rotary cleaning element" or simply as "contact resistance") generated by the surface to be cleaned F being prevented from rotating with respect to the first and second rotary cleaning elements 221 and 222. Specifically, the contact resistance of the cleaning target surface F with respect to the first and second rotary cleaning elements 221 and 222 is detected, and compared with a predetermined value set in advance and stored in the main body control unit 14. Then, when the detected contact resistance is greater than a predetermined value, the surface to be cleaned F is detected as a first surface to be cleaned, and when the detected contact resistance is less than or equal to a predetermined value, the surface to be cleaned F is detected as a second surface to be cleaned.

The first type of suction target surface F is exemplified by a floor surface on which a floor surface such as a carpet is laid, which is a floor surface on which a large resistance is applied to the hand of a user that pushes or pulls the grip 112 forward or backward through the extension tube 3 when the suction port body 2 is moved. The "resistance received by the hand of the user via the extension tube" can be referred to as a movement resistance or a running resistance of the suction port body 2. On the other hand, the second type of suction target surface F is exemplified by a floor surface such as a wooden floor or tatami, which is a floor surface with little resistance applied to the hand of the user who holds the grip 112. However, the first and second types of surfaces F to be cleaned are not limited to this.

The main body control unit 14 operates the first and second motors 231 and 232 to rotate the first and second rotary cleaning bodies 221 and 222 so as to assist the travel of the suction port body 2 in the traveling direction by a reaction force against the contact resistance of the first rotary cleaning body 221 and the second rotary cleaning body 222 when the suction target surface F is the first suction target surface, for example, when the floor surface on which the carpet Mao Jiaochang is laid is sucked by the electric vacuum cleaner C.

Specifically, the first and second rotary cleaning bodies 221 and 222 are rotated in opposite directions to each other, and one of the first and second rotary cleaning bodies 221 and 222 is rotated at a higher speed than the other rotary cleaning body rotated in the reverse direction with respect to the traveling direction.

For example, when the suction port body 2 is advanced, the front first rotary cleaning element 221 is rotated forward with respect to the traveling direction, the rear second rotary cleaning element 222 is rotated backward with respect to the traveling direction, and the rotation speed of the first rotary cleaning element 221 is increased from that of the second rotary cleaning element 222. By the difference in rotation speed between the two rotary cleaning bodies 221 and 222, the propulsive force acting in the forward direction and the propulsive force acting in the backward direction are made different with respect to the suction port body 2, and the travel of the suction port body 2 can be assisted.

On the other hand, in the case where the surface F to be cleaned is the second type of surface to be cleaned, for example, in the case where the floor surface of the wooden floor having a smooth surface is cleaned by the electric cleaner C, the first and second rotary cleaning bodies 221 and 222 are rotated in opposite directions to each other, so that the thrust forces applied to the suction port body 2 by the contact resistances of the respective surfaces F to be cleaned by the first rotary cleaning body 221 and the second rotary cleaning body 222 are balanced with each other.

For example, when the suction port body 2 is advanced, the front first rotary cleaning element 221 is rotated forward with respect to the traveling direction, the rear second rotary cleaning element 222 is rotated backward with respect to the traveling direction, and the thrust force applied to the suction port body 2 by the first rotary cleaning element 221 in the advancing direction and the thrust force applied to the suction port body 2 by the second rotary cleaning element 222 in the retracting direction are balanced with each other.

Here, the control of balancing the thrust forces applied to the suction port body 2 by the first and second rotary cleaning bodies 221 and 222, respectively, can be simply realized as control of rotating the first rotary cleaning body 221 and the second rotary cleaning body 222 in opposite directions at substantially equal speeds.

The first detection unit and the second detection unit can be realized by load sensors that detect the loads of the first motor 231 and the second motor 232.

The load sensors may detect the loads actually applied to the first motor 231 and the second motor 232 via the output shafts of the motors 231 and 232, respectively, but the loads of the first motor 231 and the second motor 232 can be replaced by the currents flowing through the first motor 231 and the second motor 232, and thus, for example, the load sensors provided in the first motor 231 and the second motor 232 can be replaced by the current sensors provided in the first motor 231 and the second motor 232.

Further, the loads of the first and second motors 231 and 232 can be estimated based not only on the currents flowing through the first and second motors 231 and 232, but also on the drive current values, which are command values for the control of the first and second motors 231 and 232.

Specifically, when the drive current value of the motors 231 and 232 is suitable for the first type of surface F to be cleaned, the load applied to the motors 231 and 232 is reduced according to the contact resistance with respect to the rotary cleaning bodies 221 and 222 when the suction port body 2 runs on the second type of surface F to be cleaned, and the drive current value is reduced to be lower than the predetermined value, whereby the second type of surface F to be cleaned is detected. On the other hand, when the drive current values of the motors 231 and 232 are suitable for the second type of surface F to be cleaned, the load applied to the motors 231 and 232 increases according to the contact resistance with respect to the rotary cleaning bodies 221 and 222 when the suction port body 2 runs on the first type of surface F to be cleaned, and the drive current value increases to exceed the predetermined value, whereby the first type of surface F to be cleaned is detected.

(action and Effect)

The suction port body 2 and the electric vacuum cleaner C of the present embodiment have the above-described configuration, and effects obtained by the present embodiment will be described below.

First, the electric vacuum cleaner C can be used more conveniently regardless of the type of the suction target surface F. Specifically, when the floor surface on which the floor surface of the carpet or the like is laid is to be cleaned, the first detection unit detects that the cleaning target surface F is the first type, and the first and second rotary cleaning elements 221 and 222 are rotated so as to assist the travel of the suction port body 2 in the traveling direction by the contact resistance of the cleaning target surface F with respect to the first rotary cleaning element 221 and the second rotary cleaning element 222. On the other hand, in the case of cleaning the floor surface such as a wooden floor surface or a tatami, the second type of cleaning object surface F is detected, and the first and second rotary cleaning elements 221 and 222 are rotated in opposite directions to each other so that the first rotary cleaning element 221 and the second rotary cleaning element 222 exert the pushing force on the suction port body 2 by the contact resistance of the cleaning object surface F.

In this way, when the first type of surface F to be cleaned having a relatively large contact resistance with respect to the first and second rotary cleaning elements 221 and 222 is cleaned, for example, a thrust force greater than the running resistance is generated with respect to the suction port body 2 by the first and second rotary cleaning elements 221 and 222, whereas when the second type of surface F to be cleaned having a relatively small contact resistance is cleaned, the resistance received by the friction between the rotary cleaning elements 221 and 222 and the surface F to be cleaned during running of the suction port body 2 can be reduced, preferably eliminated. Here, by attaching sheets of low friction material such as felt to the outer peripheral surfaces of the front support wheels 27a, 27b and the rear support wheel 28, the resistance when the suction port body 2 is moved in the left-right direction D2 can be reduced, and thus, the light operability when cleaning the floor surface of the wooden floor or the like can be achieved.

This can suppress deterioration of operability of the suction port body 2 according to the type of the suction target surface F, and can improve convenience of the electric vacuum cleaner C.

Here, when the surface F to be cleaned is the second type, the first and second motors 231 and 232 can be easily controlled by rotating the first and second rotary cleaning bodies 221 and 222 at substantially the same speed with each other, thereby cleaning the surface F to be cleaned of the second type such as the wooden floor or the tatami floor.

Further, by detecting the type of the suction target surface F and the traveling direction of the suction port body 2 based on the load of the first or second motor 231, 232, it is not necessary to add a special sensor or the like, and an increase in the number of components can be suppressed.

For example, in the case where the surface F to be cleaned is the first type, since the contact resistance of the surface F to be cleaned with respect to the first and second rotary cleaning bodies 221 and 222 is large, it can be detected based on the fact that the loads of the first and second motors 231 and 232 are relatively large.

Then, in the case where the traveling direction of the suction port body 2 is the forward direction, for example, in the case where the suction target surface F is the first type, the detection can be made based on the fact that the load applied to the motor via the rotating cleaning element rotating in the reverse direction with respect to the forward direction is relatively larger than the load applied to the motor via the rotating cleaning element rotating in the forward direction.

The traveling direction of the suction port body 2 can also be detected by a case where the force acting in the direction of pressing the suction target surface F by the rotating cleaning bodies provided forward in the traveling direction (specifically, forward in the traveling or backward in the backward direction) of the two rotating cleaning bodies 221, 222 is relatively large when the suction port body 2 is traveling and backward.

For example, when the suction port body 2 is advanced, the first rotary cleaning element 221 positioned in front tends to be pressed against the surface F to be cleaned more strongly, and therefore, the advance direction of the suction port body 2 is detected as the advance direction based on the fact that the load to the first motor 231 that drives the first rotary cleaning element 221 is relatively large.

When the suction target surface F is the first type, the first rotary cleaning element 221 and the second rotary cleaning element 222 are rotated in opposite directions, whereby efficient cleaning of dust deposited on the suction target surface F can be achieved, and the rotary cleaning elements rotating in the forward direction with respect to the traveling direction among the first and second rotary cleaning elements 221 and 222 are rotated at a higher speed than the rotary cleaning elements rotating in the reverse direction, whereby traveling of the suction port body 2 in the traveling direction can be assisted.

The control for assisting the travel of the suction port body 2 is not limited to this, and may be specifically realized by rotating the first rotary cleaning element 221 and the second rotary cleaning element 222 in the same direction as the forward direction with respect to the traveling direction of the suction port body 2. For example, when the suction port body 2 is advanced, both the front first rotary cleaning element 221 and the rear second rotary cleaning element 222 are rotated in the forward direction.

In this way, by rotating both the first and second rotary cleaning elements 221 and 222 in the same direction in which the suction port body 2 travels, the suction port body 2 can be more actively assisted in traveling in the traveling direction.

(other embodiments)

Fig. 8 is a perspective view showing a suction port body 2 'of another embodiment of the present invention when viewed from the left obliquely front side with respect to the advancing direction, fig. 9 is a plan view showing the suction port body 2' when viewed from above, fig. 10 is a bottom view showing the suction port body 2 'when viewed from below, and fig. 11 is a side view showing the suction port body 2' when viewed from the left side.

The directions shown in fig. 8 are the same as those in the previous embodiment, and for example, "front" or "forward" in the suction port body 2' of the present embodiment means the front or front with respect to the advancing direction of the suction port body 2', and "right" or "right" means the right or right with respect to the advancing direction of the suction port body 2 '.

In each of fig. 8 to 11, the same reference numerals as those shown in fig. 2 and the like are given to elements having the same functions or corresponding elements as those of the suction port body 2 of the previous embodiment, and the description thereof is omitted.

In the present embodiment, the configuration other than the suction port body 2' is the same as that of the electric vacuum cleaner C of the previous embodiment. In other words, the suction port body 2' can be used in place of the suction port body 2 in the electric vacuum cleaner C of the previous embodiment.

The suction port body 2' of the present embodiment is different from the suction port body 2 of the previous embodiment in the following points. The following description is given for the purpose of specific description, but is not limited to this, if the details are included.

The first point is that three support wheels, specifically, a pair of front support wheels 27a ', 27b ' and a rear support wheel 28', which are provided on the rear surface 21r of the housing 21 are disposed at positions located at the apexes of the triangle in a state where the rear surface 21r of the housing 21 is viewed from below, and that the joint portion 26' which is a joint portion of the connection pipe 25 with respect to the housing 21 is disposed inside the triangle having the three support wheels 27a ', 27b ', 28' as the apexes in a plane direction parallel to the suction target surface F or the horizontal plane.

In the present embodiment, as shown in fig. 10 and 11, a pair of front support wheels 27a and 27b are disposed at a position forward of the suction port 21a, a rear support wheel 28' is disposed at a position rearward of the suction port 21a, and the joint portion 26' is disposed inside a triangle having the three support wheels 27a ', 27b ', 28' as vertexes. The joint portion 26' is connected to the housing 21 so as to be swingable about a first axis in the front-rear direction D1, and is connected to be rotatable up and down about a second axis perpendicular to the first axis. The joint portion 26' is not limited to this, and may be connected so as to be rotatable up and down about an axis in the left-right direction D2, or may be connected so as to be movable up and down and in all directions of the left and right by a universal joint structure. In the explanation relating to the present embodiment, the joint portion 26' constitutes a connection portion of the "air path body".

In this connection, in the present embodiment, the front support wheels 27a ', 27b' disposed in front of the joint portion 26 'and the rear support wheel 28' disposed behind the joint portion 26 'below the connection pipe 25 are all universal wheels, and the rotation shafts of the front support wheels 27a', 27b 'and the rear support wheel 28' are rotatable about the axis in the vertical direction.

In this way, by disposing the joint portion of the connection pipe 25 with respect to the suction port body 2', that is, the joint portion 26', inside the triangle having the three support wheels 27a ', 27b', 28 'as the vertices, the force transmitted from the extension pipe 3 during the operation of the suction port body 2' can be well dispersed to the three support wheels 27a ', 27b', 28', and the suction port body 2' can be more reliably supported with respect to the suction target surface F.

Further, by making at least two of the three support wheels 27a ', 27b', 28', and making all of the support wheels 27a', 27b ', 28' universal in the present embodiment, not only the movement in the front-rear direction D1 but also the movement in the left-right direction D2 can be easily corresponded, and further higher operability can be achieved.

The second point is that a rotating roller 311 protruding from the back surface 21r of the housing 21 is provided on the back surface 21r side of the housing 21, and the type of the suction target surface F and the traveling direction of the suction port body 2' are detected based on the operation of the rotating roller 311. That is, in the present embodiment, the rotating roller 311 is an element shared by the first detection unit and the second detection unit. Based on the operation of the rotating roller 311, it is possible to detect whether the suction target surface F is the first suction target surface, and whether the direction of travel of the suction port body 2' is the forward direction or the backward direction.

Fig. 12 is a schematic diagram schematically showing the configuration of the second detection unit provided in the suction port body 2'.

The second detection unit includes a rotation roller 311 as a common element with the first detection unit, and includes a reflection roller 312 coupled to the rotation roller 311 so as to be rotatable in synchronization therewith. As shown in fig. 11, the rotating roller 311 is located closer to the rear surface 21r of the housing 21 than the ground contact points of the supporting wheels 27a ', 27b ', 28', and when the suction port body 2' is placed on a hard ground surface F such as a floor surface of a wooden floor, the supporting wheels 27a ', 27b ', 28' are in contact with the ground contact point with the ground surface F, and the rotating roller 311 is maintained in a state separated from the ground surface F. Fig. 11 shows a gap between the ground F and the rotating roller 311 by a symbol g. On the other hand, when the suction port body 2 'is placed on a soft floor surface F such as a carpeted floor surface, the rotation roller 311 contacts the floor surface F and rotates with the movement of the suction port body 2' by friction with the floor surface F.

The reflection roller 312 has a first reflection roller 312a and a second reflection roller 312b, and the first reflection roller 312a and the second reflection roller 312b are fixed to each other. The outer peripheral surface of the first reflection roller 312a and the outer peripheral surface of the second reflection roller 312b are each formed with a reflection portion s1 extending over a range of 180 ° in the circumferential direction, and a non-reflection portion s2 is formed over a range of 180 ° other than the reflection portion s 1. The reflection portion s1 of the first reflection roller 312a and the reflection portion s1 of the second reflection roller 312b are offset from each other by 90 ° in the circumferential direction.

Further, a first photosensor 321a is provided near the outer peripheral surface of the first reflection roller 312a, and a second photosensor 321b is provided near the outer peripheral surface of the second reflection roller 312 b. The first and second photosensors 321a and 321b output a high (H) signal when facing the reflective sections s1 of the corresponding reflective rollers 312a and 312b, and output a low (L) signal when facing the non-reflective sections s 2. The detection signals of the first and second photosensors 321a, 321b are transmitted to the main body control unit 301 via signal lines routed through the extension tube 3.

The main body control unit 301 detects the direction of travel of the suction port body 2' based on the characteristics of the detection signals output from the first and second photosensors 321a, 321b. For example, when the rise of the detection signal outputted from the first photosensor 321a from the L signal to the H signal is detected while the H signal is outputted from the second photosensor 321b, the rotation direction of the rotation roller 311 is detected as the forward rotation direction and the traveling direction of the suction port body 2' is detected as the forward traveling direction. On the other hand, when the rise of the detection signal output from the first photosensor 321a is detected while the L signal is output from the second photosensor 321b, it is detected that the rotation direction of the rotation roller 311 is the reverse direction and the traveling direction of the suction port body 2' is the reverse direction.

The second detecting unit thus detects the traveling direction of the suction port body 2'. The first detection unit can detect whether the surface F to be sucked is a relatively soft first or a relatively hard second based on whether the rotating roller 311 is rotating or stopping.

In the present embodiment, the rotating roller 311 corresponds to "rolling elements", and constitutes "a movable portion" of the first detection portion.

In this way, the first detection unit and the second detection unit are realized by a common configuration, specifically, a configuration including the rotating roller 311, whereby simplification of the configuration and reduction of cost can be promoted. Further, by sharing the configuration, the space or area occupied by the first and second detection units can be reduced, and the operability can be further improved by reducing the weight.

In the above description, the stick type vacuum cleaner is used as the vacuum cleaner, but the vacuum cleaner that can be used is not limited to this, and various vacuum cleaners including a suction port body such as a canister type vacuum cleaner or an upright type vacuum cleaner can be used.

In the above description, the secondary battery is used as the power source of the electric vacuum cleaner, but the power source of the electric vacuum cleaner is not limited to this, and may be a commercial ac power source.

The control of switching the operation modes of the motors (first motor and second motor) is not limited to being realized by a control unit (main body control unit) provided in the cleaner main body, and may be realized by a control unit provided in the suction port body.

The type of the suction target surface F can be detected by providing a contact sensor or an optical sensor on the rear surface 21r of the housing 21, in addition to the above. That is, the type of the surface F to be sucked is detected as the first type or the second type based on the relative distance relation between the back surface 21r of the housing 21 and the surface F to be sucked. For example, an optical sensor is provided on the back surface 21r of the case 21 so as to irradiate the surface F to be cleaned with infrared rays and receive the reflected light. Then, when the surface F to be sucked is the first one of the hard surfaces, the distance between the optical sensor and the surface F to be sucked is maintained, and the reflected light is received by the optical sensor, whereas when the surface F to be sucked is the second one of the soft surfaces, the reflected light is not received by the optical sensor, and the optical sensor is close to the surface F to be sucked.

The direction of travel of the suction port body can be detected by the following arrangement in addition to the above: a cam is mounted coaxially with the rotation axis of any one of the universal wheel, the front support wheel 27a ', 27b', and the rear support wheel 28', and a mechanical switch pressed by the cam according to the rotation operation of the front support wheel 27a', 27b ', or the rear support wheel 28' is provided adjacent to the cam. In this case, the cam and the switch constitute a second detection portion.

It is also possible to provide a dust sensor for detecting the amount of dust contained in the dust-containing air and to detect the dust collection state of the electric vacuum cleaner, that is, the degree of removal of dust from the surface to be collected. The dust sensor is, for example, provided in an appropriate portion of a ventilation path from the suction port to the dust collecting portion of the cleaner body, preferably in a suction chamber of the suction port body.

The control of switching the operation mode of the motor can be performed not only by the step of determining whether the type of the surface to be cleaned is the first type or the second type, but also by the following steps.

After the operation of the electric vacuum cleaner is started, the first and second motors are operated in the first operation mode, and the first rotary cleaning element and the second rotary cleaning element are rotated in opposite directions so that the propulsive forces applied to the suction port body by the contact resistances of the surfaces to be cleaned are balanced with each other. For example, the first rotary cleaning element and the second rotary cleaning element are rotated at substantially equal speeds in mutually opposite directions. When the first detection unit detects that the surface to be cleaned is a first surface to be cleaned having a contact resistance with respect to the first and second rotary cleaning elements greater than a predetermined value, the operation modes of the first and second motors are switched to the second operation mode, and the first and second motors are operated so as to assist the travel of the suction port body in the traveling direction by the contact resistance with the first and second rotary cleaning elements. In other cases, the first and second motors are continuously operated in the first operation mode. The switching to the second operation mode can be performed by detecting the direction of travel of the suction port body when the user pushes or pulls the grip 112 by the second detection unit, and based on the result thereof.

While several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the scope of patent claims and the equivalent scope thereof.

Claims

1. An electric vacuum cleaner is provided with:

a suction inlet body;

a cleaner main body; and

the control part is used for controlling the control part to control the control part,

the suction port body includes:

a housing formed with a suction port;

a first rotary cleaning element which is disposed on the front and rear sides of the suction port and rotatably supported by the housing, and which has a first outer peripheral portion which contacts the surface to be cleaned when cleaning;

a second rotary cleaning element which is disposed on the other side of the suction port in parallel with the first rotary cleaning element, is rotatably supported by the housing, and has a second outer peripheral portion which contacts the surface to be cleaned when cleaning;

a first motor configured to be capable of driving the first rotary cleaning element; and

A second motor configured to be capable of driving the second rotary cleaning body independently of the first rotary cleaning body,

the cleaner body has a dust collecting part configured to collect dust sucked through the suction inlet,

the control unit includes:

a first detection unit configured to detect a type of the surface to be cleaned; and

a second detecting part for detecting the advancing direction of the suction inlet body,

when the surface to be cleaned is a first surface to be cleaned having a contact resistance with respect to the first and second rotary cleaning elements greater than a predetermined value, the first and second rotary cleaning elements are rotated so as to assist the travel of the suction port body in the traveling direction by the contact resistance of the first rotary cleaning element and the second rotary cleaning element,

on the other hand, when the suction target surface is the second suction target surface having the contact resistance smaller than the predetermined value, the first and second rotary cleaning elements are rotated in opposite directions to each other so that the propulsive forces applied to the suction port body by the first and second rotary cleaning elements are balanced by the contact resistance.

2. The electric vacuum cleaner of claim 1, wherein,

the control unit rotates the first and second rotary cleaning elements at substantially equal speeds to each other when the surface to be cleaned is the second surface to be cleaned.

3. The electric vacuum cleaner of claim 1, wherein,

the first detecting unit detects the type of the surface to be cleaned based on the load of the first or second motor.

4. The electric vacuum cleaner of claim 1, wherein,

the suction port body further includes a support portion provided on the back surface side of the housing and having a grounding point at a position apart from the back surface of the housing,

the first detection unit includes a movable portion protruding from the rear surface of the housing and having a contact end at a position closer to the rear surface of the housing than the ground point, and detects the type of the surface to be sucked based on whether the surface to be sucked is in contact with the movable portion.

5. The electric vacuum cleaner as claimed in claim 4, wherein,

the first detection unit includes a rolling element rotatably supported with respect to the housing as the movable unit,

The second detection unit detects a traveling direction of the suction port body based on rotation of the rolling element in accordance with movement of the suction port body when the suction target surface is the first suction target surface.

6. The electric vacuum cleaner as claimed in claim 4, wherein,

the support part comprises three support parts positioned at the vertexes of a triangle in a state that the back surface of the shell is observed from the lower side,

at least two of the three support portions are universal wheels.

7. The electric vacuum cleaner as claimed in claim 4, wherein,

and an air path body connected to the suction port body and the cleaner body, forming a part of an air path from the suction port to the dust collection unit,

the air passage body is disposed inside a triangle having the three support portions as vertexes with respect to the connection portion of the suction port body in a plane direction parallel to the suction target surface.

8. The electric vacuum cleaner of claim 1, wherein,

the second detecting unit detects a traveling direction of the suction port body based on a load of the first or second motor.

9. An electric vacuum cleaner according to any one of claims 1 to 8, wherein,

the control unit rotates the first and second rotary cleaning elements in opposite directions to each other, and rotates one of the first and second rotary cleaning elements, which rotates the other rotary cleaning element, which rotates in a forward direction with respect to the traveling direction, at a higher speed than the other rotary cleaning element, which rotates in a reverse direction with respect to the traveling direction, when the surface to be cleaned is the first surface to be cleaned.

10. An electric vacuum cleaner according to any one of claims 1 to 8, wherein,

the control unit rotates the first and second rotary cleaning elements in the same direction that is forward with respect to the traveling direction when the surface to be cleaned is the first surface to be cleaned.

11. An electric vacuum cleaner is provided with:

a suction inlet body;

a cleaner main body; and

the suction port body includes:

a housing formed with a suction port;

the control unit includes:

after the operation of the electric vacuum cleaner is started, the first and second motors are operated in a first operation mode in which the first and second rotary cleaning elements are rotated in opposite directions so that the first and second rotary cleaning elements are balanced in thrust applied to the suction port body by contact resistance of the suction target surface with respect to the first and second rotary cleaning elements,

When the first detection unit detects that the suction target surface is a suction target surface having a contact resistance greater than a predetermined value, the operation mode of the first and second motors is switched to a second operation mode, and the first and second motors are operated so that the travel of the suction port body in the traveling direction is assisted by the contact resistance of the first and second rotating cleaning bodies.