TWI743634B - Mobile air purifier - Google Patents

Abstract

The subject of the present invention is to provide a mobile air purifier capable of suppressing sound in the rest mode. Means of Solution The mobile air cleaner (1) of the present invention is equipped with wheels (9s1, 9s2), a drive motor (9m1, 9m2) that drives the wheels (9s1, 9s2), and removes the air sucked from the suction port (2i) A filter (3) for dust in the indoor air, a fan (6) installed on the downstream side of the air flow through the filter (3), an outlet (2o) for discharging the dust-removed air, and a control drive The control device (5a) of the motor (9m1, 9m2), the means (11a) for determining whether it is the first mode or the second mode, and the maximum propulsion force of the driving motor (9m1, 9m2) in the second mode , The propulsion force setting means (12b) is set to a predetermined propulsion force smaller than the maximum propulsion force of the driving motor (9m1, 9m2) in the first mode.

Description

Mobile air purifier

The present invention relates to a mobile air cleaner.

The previous fixed-type air purifier was fixedly installed, so it was unable to clean the stagnant area of the indoor air, and the power consumption would increase for the purpose of purifying the stagnant area. In contrast, a mobile air purifier can be moved to a dirty place in the home to clean it. In other words, the mobile air purifier can clean a wider space by moving between rooms.

In addition, the mobile air purifier can be moved to the dirty part of the house to clean the air, so it has the advantage of being able to clean with a small air volume and quietly. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 2016-220174 (paragraphs 0589, 0591, etc. of the specification) [Patent Document 2] Japanese Patent Application Publication No. 2015-181778 (paragraph 0031 of the specification, etc.) [Patent Document 3] JP 2013-230294 A (paragraphs 0044 to 0046 of the specification, FIG. 5, etc.)

[The problem to be solved by the invention]

However, the mobile air purifier may be operated while someone is sleeping. The mode in which a mobile air purifier operates while a person is going to bed is called a rest mode. In the resting mode, the mobile air purifier will vibrate when crossing the cable or running on the carpet. Because the user is going to bed, there is a situation where the vibration and sound are noise.

Also, in the rest mode, the mobile air purifier walks in the dark when the lighting is turned off, so there is a risk of hitting a user walking indoors.

In Patent Document 1, it is described that when a user sets a silent mode (rest mode), the volume and exhaust volume generated by the cleaning robot are reduced. Record as the user’s pre-set mode, when the user sets "allowing bed cleaning (silent mode)", and the room lighting is turned off at night, the sweeping robot automatically determines that the user is sleeping and automatically sets it to The content of the silent mode state.

In Patent Document 2, there is a record that people are sleeping when "night" and "dark" are high, so the operation mode is set to "quiet" and the message volume is set to "small".

Patent Document 3 describes that when a self-propelled sweeper detects the presence of a person within the proximity limit with a human sensor or the like, the operation mode is switched to the silent mode.

However, in Patent Documents 1 to 3, although there are descriptions about the rest mode of the mobile air purifier, there is no description about the sound generated during the rest mode. In addition, in Patent Documents 1 to 3, there is no description of a structure for notifying the existence of a mobile air purifier during the rest mode.

The present invention is the inventor in view of the foregoing actual situation, and its object is to provide a mobile air purifier that can suppress the sound generated in the rest mode. [Means to solve the problem]

In order to solve the aforementioned problems, the mobile air cleaner of the present invention is provided with: wheels, which move the frame; a driving motor, which drives the wheels; The dust in the air; the fan is arranged on the downstream side of the air flow of the air passing through the filter; the outlet is to discharge the air from which the dust is removed; the control device is to control the driving motor; the determination means is to determine It is the first mode, or the second mode with a lower operating sound than the first mode; and the propulsion force setting means is to set the maximum propulsion force of the driving motor in the second mode to be higher than that in the first mode The maximum propulsion force of the aforementioned driving motor is smaller than the predetermined propulsion force. [Effects of the invention]

According to the present invention, it is possible to provide a mobile air purifier capable of suppressing sound in the rest mode.

Hereinafter, embodiments of the present invention will be described in detail while referring to the drawings as appropriate. Fig. 1 shows a mobile air cleaner 1 according to an embodiment of the present invention. Fig. 2 shows a plan view of the mobile air cleaner 1 of the embodiment. Fig. 3 reveals the I-I section of Fig. 2.

The mobile air cleaner 1 of the embodiment of the present invention has a normal mode (first mode) and a rest mode (second mode). The general mode refers to a mode in which the air is cleaned while walking during the day.

The rest mode refers to a mode in which the rotation speed of the fan (centrifugal impeller 6) is reduced during sleep at night to clean the air. In the rest mode, the mobile air purifier 1 is to avoid the level difference in order to suppress the vibration and sound of the vehicle body when passing through the level difference. Specifically, in the rest mode, the maximum driving force of the walking wheels is limited, so that it cannot cross the step.

By suppressing the operating sound, that is, suppressing the vibration sound by suppressing the sound of the fan, it is difficult to know where the mobile air purifier 1 is in the room. Therefore, a means 11c for urging people's attention is equipped (Figure 6). When an approaching person is detected in the rest mode, an attention urging means (such as an LED, etc.) flashes or lights to urge attention. As shown in Figs. 1 and 2, the mobile air cleaner 1 is a vehicle body 1H having a substantially cylindrical shape.

As shown in Fig. 3, the vehicle body 1H of the mobile air cleaner 1 is provided by air supply means 1w, traveling means 1r, filters 3, sensors (11b, 11d), human attention urging means 11c, control board 5a, And the battery 5b, the inner package and the outer cover 2 are formed. On the top of the exterior protective cover 2, an upper cover 2f that can be opened and closed is attached.

When the filter 3 is exchanged, the upper cover 2f is opened, and the filter 3 is held by the handle 3h (Figure 3), and the filter 3 can be lifted.

As shown in FIGS. 1 and 2, on the upper side surface of the exterior cover 2, a vehicle body suction port 2i is provided all around. Furthermore, the vehicle body suction port 2i may be provided in a part of the side portion of the mobile air cleaner 1.

In Fig. 4(a), a side view of the mobile air purifier 1 is revealed, Fig. 4(b) is shown in the section II-II of Fig. 4(a), and Fig. 4(c) is shown in Fig. 4(a) III -III section.

As shown in FIG. 4(c), the vehicle body discharge port 2o is provided in the lower part of the vehicle body 1H.

As shown by the arrow α1 in Fig. 3, the suction port 2i provided on the entire side circumference sucks indoor air from the entire side circumference. The air cleaned by removing dust and the like by the filter 3 is discharged downward from the lower discharge port 2o as shown by the arrow α2 in FIG. 3.

The air blowing means 1w shown in FIG. 3 includes a centrifugal impeller 6, an impeller motor 6m, and a reel 7. The impeller motor 6m is arranged coaxially with the centrifugal impeller 6 and drives the centrifugal impeller 6.

The centrifugal impeller 6 series is arranged roughly upwards. The centrifugal impeller 6 sucks in air from above through the suction port 6i by rotating, and discharges it to the bottom through the discharge port 2o (arrow α2 in FIG. 3). Furthermore, the suction port 6i refers to the upper end surface 6h1 of the blade 6h of the centrifugal impeller 6 (FIG. 3).

As shown in FIG. 4(c), the reel 7 is provided on the outer periphery of the centrifugal impeller 6 in a spiral shape in a plan view.

A rear view of the mobile air cleaner 1 is shown in FIG. 5. The traveling means 1r shown in FIGS. 3 and 5 has left and right wheels 9s1 and 9s2, wheel motors 9m1 and 9m2 (refer to FIG. 3), and a rear wheel 9k. The wheel motors 9m1 and 9m2 drive the left and right wheels 9s1 and 9s2, respectively.

In the mobile air purifier 1, a pair of left and right wheels 9s1 and 9s2 and a rear wheel 9k are installed protruding below. The left and right wheels 9s1 and 9s2 are driving wheels, and the rear wheel 9k is a driven wheel.

As means for transmitting power from the wheel motors 9m1 and 9m2 to the left and right wheels 9s1 and 9s2, belts are used. The power trains from the wheel motors 9m1 and 9m2 are respectively transmitted to the left and right wheels 9s1 and 9s2 through pulleys (not shown).

The rear wheel 9k is fixed to the lower plate 2s (refer to FIG. 3) through casters (not shown). The caster train is rotatably held on the lower plate 2s.

The filter 3 shown in Figure 3 and Figure 4(b) has a pre-filter to remove dust with a large particle diameter, a HEPA filter to remove dust with a small particle diameter, and to remove odorous components. Of deodorizing filters. The filter 3 is attached to the inside of the vehicle body suction port 2i, and is provided in a substantially circumferential shape in a plan view. As shown in FIG. 3, the filter 3 is installed in the upper side of the vehicle body 1H in the height direction.

Furthermore, if the filter 3 is installed on the upper side of the vehicle body 1H, it may be continuously installed in a ring shape, or may be intermittently installed in a ring shape.

<The arrangement of filter 3 and centrifugal impeller 6> In the mobile air cleaner 1, the filter 3 is installed on the side of the vehicle body 1H, and the air flow direction (arrow α1 in FIG. 3) is deflected at a substantially right angle, and flows into the suction port 6i of the upward centrifugal impeller 6 ( image 3). That is, the air passing through the filter 3 is deflected at a substantially right angle (downward in the vertical direction), and flows into the suction port 6 i of the centrifugal impeller 6.

Moreover, the lower end surface 3a (refer FIG. 3) of the filter 3 arrange|positioned at the side part of the mobile air cleaner 1 is arrange|positioned above the lower end surface 6h2 of the impeller 6h of the centrifugal impeller 6.

A bottom perspective view of the mobile air cleaner 1 is shown in FIG. 6. At almost the center of the bottom plate 2t of the mobile air purifier 1, the attention urging means 11c for urging people's attention is provided protruding below. That is, the human attention urging means 11c is installed in a position that cannot be directly visually observed. In the rest mode, when someone approaching is detected in the dark, the LED of the reminder means 11c flashes or lights up.

The LED of the human attention urging means 11c is installed protruding below, so it will flicker or light up toward the floor Y. Therefore, the shadow of the mobile air purifier 1 appears in the dark without glare to the user. In addition, if the human attention urging means 11c such as an LED is installed facing downward, it may be installed in a place of the vehicle body 1H other than the floor 2t.

＜Control System＞ The control board 5a shown in FIG. 3 is supplied with power from the battery 5b.

A block diagram of the control structure of the mobile air cleaner 1 is shown in FIG. 7. A microcomputer and various circuits are mounted on the control board 5a.

The mobile air cleaner 1 has an action control unit 11 and an action control unit 12. The action control unit 11 determines the control of the mobile air cleaner 1 based on the information of the sensors (11b, 11d) and the like. The action control unit 12 controls each component of the mobile air cleaner 1 based on the information from the action control unit 11.

＜Action Control Unit 11＞ The motion control unit 11 is an arithmetic device 11a that inputs information from the human detection means 11b and the dust sensor 11d. The attention urging means 11c is flashing or lighting by the computing device 11a.

The computing device 11a is composed of hardware and software. Furthermore, the arithmetic device 11a may be constituted by a circuit (only hardware). The human detection means 11b is composed of an ultrasonic sensor, an infrared camera, a laser sensor, a ToF sensor, etc., and is installed in the vehicle body 1H. The infrared camera detects obstacles. The ToF sensor measures the distance to obstacles.

As described above, the attention urging means 11c is composed of LEDs. The LED of the attention urging means 11c flashes or lights up toward the floor Y, and informs the user of the existence of the mobile air purifier 1. The dust sensor 11d detects dust.

Furthermore, as the sensor, a taste sensor (not shown) or the like that detects taste may also be used.

＜Motion control part 12＞ The operation control unit 12 includes an arithmetic device 12a, left and right wheel torque specifying means 12b, and left and right wheel rotation detecting means 12c. The impeller motor 6m, the left and right wheel motors 9m1, 9m2, and the display unit s2 are controlled by the computing device 12a.

The computing device 12a is composed of hardware and software. Furthermore, the arithmetic device 11a may be constituted by a circuit (only hardware). The left and right wheel torque designation means 12b are torque control drivers, and currents corresponding to a predetermined torque are passed to the left and right wheel motors 9m1 and 9m2.

The left and right wheel rotation detection means 12c are encoders or Hall elements, etc., and are built in the left and right wheel motors 9m1 and 9m2. In addition, the left and right wheel rotation detecting means 12c may be provided outside the left and right wheel motors 9m1 and 9m2.

The information of the left and right wheel rotation detecting means 12c is input to the computing device 12a. The left and right wheel motors 9m1 and 9m2 are controlled by the computing device 12a through the left and right wheel torque specifying means 12b. The display unit s2 displays the operation and operation of the mobile air cleaner 1. On the display part s2, information of the action control part 12 and the action control part 11 is displayed. The display unit s2 uses, for example, a 7-segment liquid crystal display.

With the aforementioned structure, the mobile air cleaner 1 cleans the air in the room through the filter 3 while walking autonomously. As described above, the mobile air cleaner 1 has a normal mode and a rest mode. In the rest mode, the rotation speed of the centrifugal impeller 6 is reduced so as not to interfere with the sleep of the user, and control is performed to suppress the operating sound.

＜Operation part 1S＞ As shown in FIG. 1, the operation part 1S of the mobile air cleaner 1 is arrange|positioned on the upper surface of the vehicle body 1H behind the upper cover 2f.

The operation part 1S has an operation button s1 and a display part s2. The wiring connected to the operation button s1 of the operation part 1S and the display part s2 is connected to the control board 5a (refer FIG. 3).

<The driving force and step difference of the left and right wheels 9s1 and 9s2> The mobile air purifier 1 performs walking to avoid the step Y1 (FIG. 10) of the floor Y.

Therefore, the driving propulsion force when the left and right wheels 9s1 and 9s2 cross the step Y1 will be described.

Fig. 8 reveals the change in the driving force relative to the time when the mobile air cleaner 1 crosses the step Y1. The horizontal axis of FIG. 8 represents the time, and the vertical axis of FIG. 8 represents the driving propulsion force (torque). When crossing the step Y1, the driving force of the left and right wheels 9s1 and 9s2 will rise sharply. Then, after crossing the level difference Y1, the driving propulsion system is reduced to the same level as the driving propulsion force before reaching the level difference Y1.

According to Fig. 8, it can be seen that when the left and right wheels 9s1 and 9s2 contact the level difference Y1, if the driving propulsion force exceeds the level difference driving propulsion force fa, the vehicle body 1H can cross the level difference Y1. 9 shows the change of the driving propulsion force relative to the time when the maximum driving propulsion force is restricted according to the setting of the rest mode in the mobile air purifier 1. The horizontal axis of FIG. 9 represents the time, and the vertical axis of FIG. 9 represents the driving propulsion force.

When the rest mode is used, the maximum driving propulsion force f1 is set to be lower than the driving propulsion force fa (FIG. 8) over the step, and it becomes impossible to cross the gap that requires the driving propulsion force fa to cross the step. In other words, by setting the rest mode, if the maximum driving propulsion force is limited to less than the maximum driving propulsion force of the normal mode, it becomes only possible to cross the step up to the height of the restricted maximum driving propulsion force f1.

Therefore, in the mobile air cleaner 1, the maximum driving force ( Maximum torque) f1.

<The driving force of the left and right wheels 9s1 and 9s2 when crossing the step Y1> Next, the driving propulsion force of the left and right wheels 9s1 and 9s2 when crossing the level difference Y1 will be described.

Fig. 10 shows a schematic diagram when the left and right wheels 9s1 and 9s2 of the mobile air cleaner 1 cross the step Y1. The level difference Y1 has a height h from the floor Y. When the left and right wheels 9s1 and 9s2 are in contact with the level difference Y1 at the point P, the left and right wheels 9s1 and 9s2 are in contact with the floor Y at the point A.

The left and right wheels 9s1 and 9s2 have a radius r and a center O. The driving force F of the mobile air cleaner 1 across the step Y is based on the clockwise momentum caused by the driving force F around the point P, which is greater than that of the mobile air cleaner 1 applied to the left and right wheels 9s1 and 9s2 The relationship of the counterclockwise momentum caused by the weight (mg) of, is represented by the following formula (1). [Number 1]

The floor Y on which the mobile air cleaner 1 can walk in the rest mode is, for example, a smooth hard floor where no sound is generated during walking. A smooth and hard floor that does not produce sound has a low rolling resistance (= the driving propulsion caused by the left and right wheels 9s1 and 9s2). Then, the relationship of the following formula (2) is established.

Drive propulsion force for smooth hard floor <Maximum drive propulsion force in rest mode f1 <Set step height (carpet, cable, etc.) across drive propulsion 　　　　(2) As the setting of the step height, for example, about 2 to 3 mm is considered. Furthermore, the setting of the step height can be arbitrarily determined.

The driving force of formula (2) is caused by the left and right wheels 9s1 and 9s2. That is, the driving propulsion force of the formula (2) is the sum of the driving propulsion forces of the left and right wheels 9s1 and 9s2.

<Walking control flow in rest mode> Next, the flow of the walking control in the rest mode of the mobile air cleaner 1 will be described.

Fig. 11 shows the walking control flow of the mobile air cleaner 1 in the rest mode. The control system in the rest mode is mainly performed by the arithmetic device 11 a of the action control unit 11 and the arithmetic device 12 a of the action control unit 12.

When the mobile air cleaner 1 is started, first, it is judged by the arithmetic device 11a whether it is in the rest mode (step S11 in FIG. 11). When it is not in the rest mode (No in step S11), it shifts to the normal mode (step S12).

When it is in the rest mode (Yes in step S11), the computing device 12a uses the left and right wheel torque specifying means 12b to change the maximum driving force (maximum driving torque) of the left and right wheels 9s1 and 9s2 to the rest mode setting. In addition, the arithmetic device 12a changes the rotation speed of the centrifugal impeller 6 to the rest mode setting (step S13). Then, the mobile air cleaner 1 performs random movement under the control of the arithmetic device 12a (step S14).

During random movement, it is determined by the arithmetic device 11a whether or not to shift to the normal mode (step S15). When it is determined that it has shifted to the normal mode (Yes in step S15), it shifts to the normal mode (step S12).

When it is not determined that the transition to the normal mode is made (No in step S15), the process proceeds to step S16. In step S16, the arithmetic device 11a determines whether or not to stop.

When the stop button (not shown) is pressed and it is determined to be stopped (Yes in step S16), it stops. When it is determined that it is not stopped (No in step S16), the process proceeds to step S17.

During random movement, if the left and right wheels 9s1 and 9s2 contact a step Y1 greater than the set maximum driving force f1 (FIG. 10), the maximum driving force f1 cannot be crossed because the maximum driving force f1 is limited. Therefore, the mobile air purifier 1 is stuck at this place (not allowed to advance or retreat). Therefore, the left and right wheel rotation detecting means 12c detects that the left and right wheels 9s1 and 9s2 have stopped rotating for a certain period of time (step S17).

When the stop of the left and right wheels 9s1 and 9s2 is detected for a certain period of time (Yes in step S17), the arithmetic devices 11a and 12a are judged to be stuck, and first, the arithmetic device 12a performs reverse travel (step S18). After that, the mobile air cleaner 1 switches the direction (change direction) (step S19), and returns to random movement (step S14).

On the other hand, in step S17, when the rotation stop of the left and right wheels 9s1 and 9s2 is not detected (No in step S17), random movement is continued (step S14). The above is the walking control in rest mode.

Furthermore, steps S15 and S16 are not provided, and a step for judging the transition to the normal mode and a step for judging the stop may be provided using another flow. According to the aforementioned structure, when the left and right wheels 9s1 and 9s2 encounter a predetermined level difference Y1 (FIG. 10) in the rest mode, the mobile air cleaner 1 travels while avoiding the level difference Y1.

Therefore, the mobile air purifier 1 can avoid vibration that occurs when the step difference Y1 is crossed, and can ensure quietness in the rest mode.

＜The person in the rest mode should pay attention to the control of the means 11c＞ The control of the attention urging means 11c for urging people's attention will be explained.

As shown in FIG. 6, at the center of the bottom plate 2t (refer to FIG. 6) of the mobile air cleaner 1, a human attention urging means 11c is provided. When there is a person near the mobile air purifier 1 in the rest mode, the attention urging means 11c, that is, the LED flashes or emits light, to illuminate the floor Y below the mobile air purifier 1. As a result, a shadow of the mobile air purifier 1 will appear in the dark, and the user is urged to pay attention.

Fig. 12 reveals the control flow of the human attention urging means 11c in the resting mode. When the rest mode is started, the information of the human detection means 11b is used, and the computing device 11a is used to determine whether there is a person nearby (step S21 in FIG. 12).

When it is determined that there is a person (Yes in step S21 in FIG. 12), the computing device 12a uses the wheel motors 9m1 and 9m2 to stop the left and right wheels 9s1 and 9s2, and flashes or lights the LED of the attention urging means 11c (step S22 ). After that, the process proceeds to step S21.

In step S21, when it is determined that there is no person (No in step S21 in FIG. 12), the arithmetic device 12a operates the left and right wheels 9s1 and 9s2, and turns off the LED of the attention urging means 11c (step S23), and then proceeds to step S21.

The above is the control of 11c in the rest mode. According to the aforementioned structure, when there is a person nearby in the rest mode, the LED of the attention urging means 11c flashes or emits light in the dark, so that the shadow of the mobile air purifier 1 appears. Thereby, it is possible to accurately notify the size and position of the mobile air purifier 1 without making the user feel glare. Therefore, the user can be effectively urged to pay attention to the existence of the mobile air purifier 1 in the rest mode.

＜＜Other embodiments＞＞ 1. In the foregoing embodiment, various structures have been explained, and each structure may be appropriately combined to form a structure.

2. In the foregoing embodiment, the situation in which the centrifugal impeller 6 is arranged upward or downward has been described, but it may be arranged inclined upward or downward.

3. In addition, the urging means 11c can be attached to the surface of the car body 1H with organic EL instead of LED.

4. The structure described in the foregoing embodiment is an example, and various other forms can be implemented within the scope described in the scope of the patent application.

1: Mobile air purifier 1H: car body 1r: means of walking 1S: Operation Department 1w: means of air supply 2: Exterior protective cover (frame) 2f: Upper cover 2i: Main body suction port (suction port) 2o: body discharge port (discharge port) 2s: lower board 2t: bottom plate 3: filter 3h: Filter grip handle 5a: Control board 5b: battery 6: Centrifugal impeller (fan) 6h: blade 6h1: upper end face 6h2: lower end face 6i: suction port 6m: motor for impeller 7: scroll 9m1: Left wheel motor (drive motor) 9m2: Right wheel motor (drive motor) 9s1: left wheel (wheel) 9s2: right wheel (wheel) 9k: rear wheels 11: Mobility Control Department 11a: Computing device (judging means, lighting control means) 11b: Human detection methods 11c: People pay attention to urging means 11d: Dust sensor 12: Motion Control Department 12a: Computing device (control device) 12b: Left and right wheel torque designation means (propulsion force setting means) 12c: Detection method of left and right wheel rotation s1: Operation button s2: display part Y1: step difference

[Fig. 1] A perspective view of a mobile air cleaner according to an embodiment of the present invention. [Fig. 2] A plan view of the mobile air cleaner of the embodiment. [Fig. 3] A cross-sectional view taken along the line I-I in Fig. 2. [Fig. [Fig. 4] (a) is a side view of the mobile air cleaner of the embodiment, (b) is a cross-sectional view of II-II in (a), and (c) is a cross-sectional view of III-III of (a). [Figure 5] The rear view of the mobile air cleaner. [Figure 6] The bottom perspective view of the mobile air cleaner. [Figure 7] Block diagram of the control structure of the mobile air cleaner. [Fig. 8] A diagram showing the change in the driving force relative to the time when the mobile air cleaner crosses a step. [Fig. 9] A diagram showing the change in the driving propulsion force at the time when the mobile air cleaner limits the maximum driving propulsion force according to the setting of the rest mode. [Fig. 10] A schematic diagram when the left and right wheels of a mobile air cleaner cross a step. [Figure 11] The walking control flow chart in the resting mode of the mobile air purifier. [Figure 12] The control flow of the human attention urging means in the rest mode.

1: Mobile air purifier

5a: Control board

6m: motor for impeller

9m1, 9m2: left and right wheel motors

11: Mobility Control Department

11a: Computing device

11b: Human detection methods

11c: People pay attention to urging means

11d: Dust sensor

12: Motion Control Department

12a: Computing device

12b: Designation of left and right wheel torque

12c: Detection method of left and right wheel rotation

s2: display part

Claims (3)

A mobile air purifier characterized by: wheels, which are a moving frame; a driving motor, which drives the wheels; and a filter, which is arranged in the frame and removes dust in the indoor air sucked in from the suction port. ; The fan sucks in the indoor air from the suction port; the exhaust port discharges the air from which the dust is removed; the control device controls the driving motor; the judging means judges whether it is the first mode or the running sound The second mode is smaller than the first mode; the propulsion force setting means is to set the maximum propulsion force of the driving motor in the second mode to be smaller than the maximum propulsion force of the driving motor in the first mode The predetermined propulsion force; the human detection method is to detect the presence or absence of human beings; the human attention urging method is to urge people’s attention; and the lighting control method is to use when a human is detected in the situation of the aforementioned second mode The aforementioned people pay attention to urging means to light up. For example, the mobile air purifier described in the first item of the scope of patent application, wherein the propulsion force specified in the preceding paragraph is set to a propulsion force that is less than the specified step. For example, in the mobile air purifier described in item 1 of the scope of patent application, the aforementioned means for urging people to pay attention is installed under the vehicle body or facing downward.

Images