CN221013077U

CN221013077U - Foot drier

Info

Publication number: CN221013077U
Application number: CN202322683713.XU
Authority: CN
Inventors: 朱厚林
Original assignee: Zhongshan Huilong Electric Appliances Co ltd
Current assignee: Zhongshan Huilong Electric Appliances Co ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-05-28
Anticipated expiration: 2033-09-28

Abstract

The utility model discloses a foot dryer, which comprises a base, a water absorbing piece and an air extracting device, wherein the upper surface of the base is provided with an air extracting position; the water absorbing piece is arranged at the air extraction position, wherein the upper surface of the water absorbing piece is used for supporting feet, and the water absorbing piece is used for absorbing water on the soles; the air extractor is arranged on the base, an air extraction channel is communicated between the air extraction position and the air extractor, and the air extractor can extract water in the water absorbing piece. The foot dryer provided by the utility model can directly suck water on the sole of a foot through the contact of the water absorbing piece and the foot of a person, realize foot drying, and can extract the water in the water absorbing piece through the air extractor, reduce the water content of the water absorbing piece, so that the water absorbing piece can keep water absorption, and realize long-term repeated use of the water absorbing piece.

Description

Foot drier

Technical Field

The utility model relates to the technical field of foot dryers, in particular to a foot dryer.

Background

In scenes such as advanced hotel or family, people need to dry the sole after bathing to skid or leave the footprint and influence floor cleaning when stepping on the floor, at present, the foot dryer on the market usually adopts the hot air to dry the foot, and this kind of foot dryer includes the box, and the box upper surface is the footboard, is provided with the grid hole on the footboard, is provided with heating device and forced draught blower in the box, and during the use, people's foot stands in the grid hole department of footboard, and forced draught blower sends out the wind after the heating device heats from the grid hole, thereby dries people's sole. However, the foot dryer needs a fan and a heating device, the structure is relatively complex, the process of heating and evaporating water by hot air is a process of converting the water from a liquid state to a gas state, the heating device is needed to provide heat, the whole foot dryer has high power and high energy consumption, and in addition, the heating device is easy to generate short circuit or easy to generate accidents after long-time working in a humid environment, so that the existing foot dryer also has the safety problem.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the foot dryer which can omit the arrangement of the heating device, has simple structure and low cost, can reduce energy consumption and has higher safety.

The foot dryer comprises a base, a water absorbing piece and an air extracting device, wherein an air extracting position is arranged on the upper surface of the base; the water absorbing piece is arranged at the air exhaust position, wherein the upper surface of the water absorbing piece is used for supporting feet, and the water absorbing piece is used for absorbing water on soles; the air extractor is arranged on the base, an air extraction channel is communicated between the air extraction position and the air extractor, and the air extractor can extract the water in the water absorbing piece.

The foot dryer provided by the embodiment of the utility model has at least the following beneficial effects: according to the foot dryer provided by the utility model, people can stand on the water absorbing piece and directly absorb water on the sole through the water absorbing piece to dry feet, wherein the water in the water absorbing piece can be extracted through the air extracting device, the water content of the water absorbing piece is reduced, so that the water absorbing piece can keep water absorption, and long-term repeated use of the water absorbing piece is realized.

According to some embodiments of the utility model, the air extraction channel comprises an air extraction cavity and a first discharge hole, the air extraction cavity is arranged at the air extraction position, the water absorbing piece is arranged at the air extraction cavity, the base is provided with a separation cavity, the separation cavity is positioned below the air extraction cavity, the outer surface of the base is provided with a second discharge hole communicated with the separation cavity, the air extraction device is arranged in the separation cavity, the air inlet of the air extraction device is communicated with the first discharge hole, and the air outlet of the air extraction device is communicated with the separation cavity.

According to some embodiments of the utility model, the air extractor comprises a motor and an air extractor fan, the air extractor fan comprises a fan blade disc and a fan cover, a plurality of drainage sheets are arranged on the upper surface of the fan blade disc in a vortex shape, the fan cover is positioned above the fan blade disc and covers all the drainage sheets, an output shaft of the motor is connected with the fan cover, wherein the air inlet is arranged on the fan cover, and the fan blade disc, the upper cover and the drainage sheets are enclosed to form a plurality of air outlets circumferentially arranged along the fan blade disc.

According to some embodiments of the utility model, the air extractor comprises a water blocking shell, the water blocking shell is provided with a water collecting cavity with an open upper side, the side wall of the water collecting cavity is at least partially positioned below the fan blade disc, the vertical projection of the fan blade disc is positioned in the water collecting cavity, the lower end of the water blocking shell is provided with a water outlet hole, and the water collecting cavity is communicated with the separation cavity through the water outlet hole.

According to some embodiments of the utility model, the bottom wall of the water collecting cavity protrudes upwards to form an installation part, the lower surface of the water blocking shell is provided with an installation cavity extending to the installation part, the upper side wall of the installation cavity is provided with an avoidance hole, the motor is installed in the installation cavity, and the output shaft of the motor penetrates through the avoidance hole.

According to some embodiments of the utility model, the second discharge hole has a height in a vertical direction greater than the air outlet.

According to some embodiments of the utility model, a support plate is arranged in the air pumping cavity, a plurality of ventilation holes are arranged on the support plate, and the water absorbing piece is placed on the support plate.

According to some embodiments of the utility model, the base comprises a shell, a bottom cover and an air extraction bin, the shell is annular, the bottom cover is covered at the lower end of the shell, the air extraction bin is detachably embedded at the upper end of the bottom cover, the shell, the air extraction bin and the bottom cover are enclosed to form the separation cavity, and the air extraction cavity is arranged at the air extraction bin.

According to some embodiments of the utility model, the absorbent member is removable.

According to some embodiments of the utility model, the base is provided with a battery that powers the suction device at a voltage of less than 36V; or, the base is provided with a wireless charging device, the wireless charging device is electrically connected with the air extractor, and the wireless charging device supplies power to the air extractor with a voltage less than 36V.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view showing an internal structure of a foot dryer according to an embodiment of the present utility model;

FIG. 2 is an external schematic view of the foot dryer shown in FIG. 1;

FIG. 3 is an exploded view of the foot dryer shown in FIG. 1;

FIG. 4 is a schematic view of an air extractor of the foot dryer shown in FIG. 1;

Fig. 5 is an exploded view of the air extractor of the foot dryer shown in fig. 1.

Reference numerals:

Base 100, shell 110, bottom cover 120, suction bin 130, separation chamber 140, suction chamber 131, first discharge hole 132, second discharge hole 111, support 133, suction device 200, motor 210, suction fan 220, fan blade disk 221, fan cover 222, drainage sheet 2211, air inlet 2221, air outlet 223, water absorbing member 300, water retaining shell 400, water collecting chamber 410, water outlet 420, mounting portion 430, mounting chamber 440, avoiding hole 450, support plate 500, and ventilation hole 510.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1 to 3, a foot dryer according to an embodiment of the present utility model includes a base 100, a water absorbing member 300, and an air extracting device 200, wherein an air extracting position is disposed on an upper surface of the base 100; the water absorbing piece 300 is arranged at the air extraction position, wherein the upper surface of the water absorbing piece 300 is used for supporting feet, and the water absorbing piece 300 is used for absorbing water on soles; the air extractor 200 is disposed on the base 100, and an air extraction channel is communicated between the air extraction position and the air extractor 200, and the air extractor 200 can extract the moisture in the water absorbing member 300.

According to the foot dryer provided by the utility model, people can stand on the water absorbing piece 300 and directly absorb water on the sole through the water absorbing piece 300 to dry feet, wherein the water in the water absorbing piece 300 can be extracted through the air extracting device 200, the water content of the water absorbing piece 300 is reduced, the water absorbing piece 300 can keep water absorption, and the long-term repeated use of the water absorbing piece 300 is realized.

The existing foot dryer needs a heating device to provide heat to evaporate water on feet, the whole power of the foot dryer is large, generally about 1 kilowatt, so that the power is supplied by a power grid, the power supply voltage of the power grid is 110V or 220V, the existing foot dryer is easy to cause electric shock accidents once the power supply voltage exceeds 36V when the foot dryer is used in a bathroom in a wet environment. The foot devices are designed in an insulating way, so that the probability of electric shock accidents can be reduced, but the production cost is increased.

It is easily imaginable that in the present utility model, the time required for each foot drying of the water absorbing member 300 is shorter, usually about 10 seconds, and in addition, the water content of each sole of a person is usually limited, the water absorbing member 300 can dry the feet multiple times after extracting the water through the air extractor 200, so as to meet the requirement of short-time multiple use, while the bathing of the person is usually concentrated in a certain period of the day, other periods of time are usually not required for drying the feet, and the use gap of the foot dryer is long. The foot dryer provided by the utility model can fully utilize the use gap, namely, in the time gap between two times of bathing of people, the air extractor 200 is started to extract the water on the water absorbing piece 300, and the air extractor 200 can work in a mode with low power and long time because of long time gap, so that the task of extracting the water of the water absorbing piece 300 is completed. Because the air extractor 200 has small power, correspondingly, the required power supply voltage of the air extractor 200 can be designed to be very small, and in the specific implementation process, the required power supply voltage of the air extractor 200 is less than 36V, so that the air extractor can be safely used in a wet environment such as a bathroom, even if electric leakage occurs, electric shock accidents are not easy to occur, the safety is high, and the production cost is not increased. In addition, when the air extractor 200 operates with smaller power, the noise generated is small, and compared with the prior art, the foot dryer provided by the utility model has large noise during operation, and the foot dryer is equivalent to mute operation.

Specifically, in some embodiments, the foot dryer provided by the present utility model, the base 100 may be provided with a battery, so that the air extractor 200 may be powered by the battery at a voltage of less than 36V; alternatively, in some embodiments, the base 100 is provided with a wireless charging device electrically connected to the air extractor 200, the wireless charging device supplying power to the air extractor 200 at a voltage less than 36V, whereby the air extractor 200 may be powered by wireless charging at a voltage less than 36V. By adopting the arrangement, the foot dryer has high safety, can be flexibly placed, and is convenient to safely use in environments such as a bathroom.

When the existing foot dryer works in a wet environment, hot air sent out by the foot dryer carries more water vapor, and the foot dryer is poor in foot drying effect. Compared with the existing foot dryer, the foot dryer provided by the utility model can extract the moisture in the water absorbing piece 300 through the air extracting device 200, so that the water absorbing piece 300 can keep water absorption in a humid environment, and therefore, the water absorbing piece 300 can be contacted with the foot in the humid environment and absorb the moisture of the sole of the foot, and the foot can be dried effectively.

In a specific implementation process, the foot dryer provided by the utility model comprises a control device, wherein the control device is electrically connected with the air exhaust device. It is contemplated that in some embodiments, the control device may have a timing switch function, and the control device may turn on or off the air extractor at a timing to ensure that the absorbent member 300 retains long-term absorbency; in some embodiments, the control device may also be electrically connected to a humidity sensor, where the humidity sensor may detect the humidity of the water absorbing member, and the control device may control whether the air extracting device is started according to information fed back by the humidity sensor. Of course, other control modes may be adopted for the foot dryer, for example, in some embodiments, the control device may be electrically connected to a gravity sensor, the gravity sensor may detect whether a person stands on the water absorbing member 300, and the control device controls whether the air extracting device is started according to a signal fed back by the gravity sensor.

With the arrangement, the foot dryer provided by the utility model can dry feet by only standing on the water absorbing piece 300, and has no need of other redundant operations, and is simple and quick to use.

In a specific implementation process, the water absorbing member 300 may be various foaming water absorbing sponge, cotton wool pad and other water absorbing materials, the water absorbing materials are porous water absorbing materials, the air extracting device 200 can extract water of the water absorbing materials, and the water absorbing materials have flexibility, so that people can feel comfortable when standing on the water absorbing member 300.

Referring to fig. 1 and 3, it is conceivable that in some embodiments, the air extraction channel includes an air extraction cavity 131 and a first discharge hole 132, the air extraction cavity 131 is disposed at the air extraction position, the water absorbing member 300 is installed in the air extraction cavity 131, the base 100 is provided with a separation cavity 140, the separation cavity 140 is located below the air extraction cavity 131, the outer surface of the base 100 is provided with a second discharge hole 111 communicating with the separation cavity 140, the air extraction device 200 is installed in the separation cavity 140, the air inlet 2221 of the air extraction device 200 communicates with the first discharge hole 132, and the air outlet 223 of the air extraction device 200 communicates with the separation cavity 140. With the above arrangement, when the air extractor 200 works, the air extracting cavity 131 can form negative pressure, so that moisture in the water absorbing member 300 is pumped into the air extracting cavity 131 together with the outside air, then water and air are pumped into the separating cavity 140 by the air extractor 200, so that the pressure in the separating cavity 140 is higher than the outside pressure, that is, positive pressure is formed in the separating cavity 140, under the positive pressure environment, the air in the separating cavity 140 can be naturally discharged from the second discharging hole 111, and part of the moisture in the air can be changed into liquid state to stay in the separating cavity 140, thereby separating part of the water from the air, reducing the humidity of the discharged air, so that the discharged air carries a large amount of moisture and is re-absorbed by the water absorbing member 300, and the water absorption of the water absorbing member 300 is affected.

It is easy to imagine that the foot dryer provided by the utility model can reduce the moisture in the air, and besides the foot dryer provided by the utility model can be used for drying feet by the water absorbing piece 300, the foot dryer can also be used for reducing the air humidity in the environment and realizing the dehumidification function.

Wherein in some embodiments, a drawer-type water pan can be arranged in the separation cavity 140, and water can be poured out by taking out the drawer-type water pan; in other embodiments, the separation chamber 140 may also be connected to a drain pipe through which water within the separation chamber 140 is drained to a bathroom, sewer, or other location.

Referring to fig. 1, 4 and 5, it is conceivable that in some embodiments, the air extractor 200 includes a motor 210 and an air extractor 220, the air extractor 220 includes a fan disc 221 and a fan cover 222, a plurality of drainage sheets 2211 are arranged on the upper surface of the fan disc 221 in a vortex shape, the fan cover 222 is located above the fan disc 221 and covers all the drainage sheets 2211, an output shaft of the motor 210 is connected with the fan cover 222, wherein an air inlet 2221 is disposed on the fan cover 222, and the fan disc 221, the upper cover and the drainage sheets 2211 enclose to form a plurality of air outlets 223 arranged along the circumference of the fan disc 221. Therefore, when the motor 210 works, the output shaft of the motor 210 can drive the fan blade disc 221 to rotate, and then the air and moisture in the air extraction fan 220 are centrifugally thrown out from the air outlet 223 by the drainage piece 2211, so that the air extraction function is realized. Wherein, the moisture extracted from the water absorbing member 300 by the air extracting device 200 can form a water flow when passing through the air extracting cavity 131 or the air extracting fan 220, then the water flow is thrown into the separating cavity 140 by the air extracting fan 220, and the gaseous moisture in the air can form water drops when striking the inner wall of the separating cavity 140, thereby realizing that the moisture is separated from the air and stays in the separating cavity 140 temporarily. With the adoption of the arrangement, water-gas separation can be effectively performed.

Referring to fig. 1, 4 and 5, it is conceivable that in some embodiments, the air extractor 200 includes a water blocking housing 400, the water blocking housing 400 is provided with a water collecting cavity 410 with an open upper side, a side wall of the water collecting cavity 410 is at least partially located below the fan disc 221, a vertical projection of the fan disc 221 is located in the water collecting cavity 410, a water outlet hole 420 is provided at a lower end of the water blocking housing 400, and the water collecting cavity 410 is communicated with the separation cavity 140 through the water outlet hole 420. During the operation of the air extractor 200, at least part of the air and moisture centrifugally thrown out by the air extractor 220 can be pumped onto the inner wall of the water collecting cavity 410, and the air will leave from above the water collecting cavity 410 due to the higher air pressure in the water collecting cavity 410, and part of the moisture in the air can be trapped by the inner wall of the water collecting cavity 410, so that the efficiency of water-air separation can be improved.

Referring to fig. 1, 4 and 5, it is conceivable that in some embodiments, the bottom wall of the water collecting cavity 410 protrudes upward to form a mounting portion 430, a mounting cavity 440 extending to the mounting portion 430 is formed on the lower surface of the water blocking shell 400, an avoidance hole 450 is formed on the upper side wall of the mounting cavity 440, the motor 210 is mounted in the mounting cavity 440, and the output shaft of the motor 210 penetrates through the avoidance hole 450. With the above arrangement, the mounting portion 430 can protect the motor 210, and play a waterproof role.

Referring to fig. 1, it is conceivable that in some embodiments, the second discharge hole 111 has a height in the vertical direction greater than the air outlet 223, and with the above arrangement, the air suction fan 220 may be prevented from throwing air and moisture directly to the second discharge hole 111, so that the air in the separation chamber 140 is discharged at positive pressure.

It should be noted that, the air extractor 200 may also be configured in other manners, for example, the air extractor 200 may include a blower, an air inlet of the blower is communicated with the first air outlet, and a water absorbing filter is disposed at an air outlet of the blower to reduce the humidity of the air exhausted by the blower.

Referring to fig. 1 and 3, it is conceivable that in some embodiments, a support plate 500 is provided in the pumping chamber 131, a plurality of ventilation holes 510 are provided in the support plate 500, and the water absorbing member 300 is mounted on the support plate 500, so that the support plate 500 can support the water absorbing member 300, so that the water absorbing member 300 can support the foot. Wherein, a gap is arranged between the supporting plate 500 and the bottom wall of the air pumping cavity 131, so that when the air pumping device 200 works, negative pressure can be formed between the supporting plate 500 and the bottom wall of the air pumping cavity 131, and the moisture in the water absorbing member 300 can be pumped.

The bottom wall of the pumping chamber 131 is provided with a supporting portion 133, and the supporting portion 133 abuts against the supporting plate 500, so that the supporting portion 133 can support the supporting plate 500 to improve the bearing capacity of the supporting plate 500.

Referring to fig. 1 and 3, it is conceivable that in some embodiments, the base 100 includes a housing 110, a bottom cover 120 and a suction chamber 130, the housing 110 is annular, the bottom cover 120 is covered on the lower end of the housing 110, the suction chamber 130 is detachably embedded on the upper end of the bottom cover 120, the housing 110, the suction chamber 130 and the bottom cover 120 enclose a separation chamber 140, and the suction chamber 131 is disposed on the suction chamber 130. With the above arrangement, the production and processing of the base 100 can be facilitated, and the maintenance of the air extractor 200 at a later stage can be facilitated.

Referring to fig. 1 and 3, it is envisioned that in some embodiments, the absorbent member 300 may be removable, whereby after the absorbent member 300 becomes soiled, the absorbent member 300 may be removed for cleaning, and if the absorbent member 300 becomes damaged, the absorbent member 300 may be replaced.

Referring to fig. 1, it is conceivable that in some embodiments, the water absorbing member 300 is horizontally disposed at the suction position so that a person stands on the water absorbing member 300 smoothly.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. A foot dryer, comprising:

The device comprises a base (100), wherein the upper surface of the base (100) is provided with an air suction position;

The water absorbing piece (300) is arranged at the air extraction position, wherein the upper surface of the water absorbing piece (300) is used for supporting feet, and the water absorbing piece (300) is used for absorbing water on soles;

The air extractor (200) is arranged on the base (100), an air extraction channel is communicated between the air extraction position and the air extractor (200), and the air extractor (200) can extract the water in the water absorbing piece (300).

2. The foot dryer according to claim 1, wherein the air extraction channel comprises an air extraction cavity (131) and a first discharge hole (132), the air extraction cavity (131) is arranged at the air extraction position, the water absorbing member (300) is installed at the air extraction cavity (131), the base (100) is provided with a separation cavity (140), the separation cavity (140) is located below the air extraction cavity (131), the outer surface of the base (100) is provided with a second discharge hole (111) communicated with the separation cavity (140), the air extraction device (200) is installed in the separation cavity (140), an air inlet (2221) of the air extraction device (200) is communicated with the first discharge hole (132), and an air outlet (223) of the air extraction device (200) is communicated with the separation cavity (140).

3. The foot dryer according to claim 2, wherein the air extractor (200) comprises a motor (210) and an air extractor fan (220), the air extractor fan (220) comprises a fan blade disc (221) and a fan cover (222), a plurality of drainage sheets (2211) are arranged on the upper surface of the fan blade disc (221) in a vortex shape, the fan cover (222) is located above the fan blade disc (221) and covers all the drainage sheets (2211), an output shaft of the motor (210) is connected with the fan cover (222), and the air inlet (2221) is arranged on the fan cover (222), and the fan blade disc (221), the upper cover and the drainage sheets (2211) are enclosed to form a plurality of air outlets (223) arranged along the circumference of the fan blade disc (221).

4. A foot dryer according to claim 3, wherein the air extractor (200) comprises a water retaining shell (400), the water retaining shell (400) is provided with a water collecting cavity (410) with an open upper side, the side wall of the water collecting cavity (410) is at least partially located below the fan blade disc (221), the vertical projection of the fan blade disc (221) is located in the water collecting cavity (410), the lower end of the water retaining shell (400) is provided with a water outlet hole (420), and the water collecting cavity (410) is communicated with the separation cavity (140) through the water outlet hole (420).

5. The foot dryer according to claim 4, wherein the bottom wall of the water collecting cavity (410) protrudes upwards to be provided with a mounting portion (430), a mounting cavity (440) extending to the mounting portion (430) is formed in the lower surface of the water retaining shell (400), an avoidance hole (450) is formed in the upper side wall of the mounting cavity (440), the motor (210) is mounted in the mounting cavity (440), and an output shaft of the motor (210) penetrates through the avoidance hole (450).

6. A foot dryer according to claim 3, characterized in that the second discharge opening (111) has a height in the vertical direction which is greater than the air outlet (223).

7. A foot dryer according to claim 2, characterized in that a support plate (500) is arranged in the suction chamber (131), a plurality of ventilation holes (510) are arranged in the support plate (500), a gap is arranged between the support plate (500) and the bottom wall of the suction chamber (131), and the water absorbing member (300) is arranged on the support plate (500).

8. The foot dryer according to claim 7, wherein the base (100) includes a housing (110), a bottom cover (120) and an air extraction chamber (130), the housing (110) is annular, the bottom cover (120) is covered at the lower end of the housing (110), the air extraction chamber (130) is detachably embedded at the upper end of the bottom cover (120), the housing (110), the air extraction chamber (130) and the bottom cover (120) enclose to form the separation chamber (140), and the air extraction chamber (131) is arranged in the air extraction chamber (130).

9. A foot dryer according to any one of claims 1 to 8, wherein the water absorbing member (300) is detachable.

10. A foot dryer according to any one of claims 1 to 8 wherein: the base (100) is provided with a battery which supplies power to the air extraction device (200) at a voltage of less than 36V; or alternatively, the first and second heat exchangers may be,

The base (100) is provided with a wireless charging device, the wireless charging device is electrically connected with the air extractor (200), and the wireless charging device supplies power to the air extractor (200) with voltage less than 36V.