Toothbrush sterilizer

Abstract

The utility model discloses a toothbrush sterilizer which comprises a shell, a heating unit and at least one sterilizing lamp, the shell is provided with a first cleaning cavity. The heating unit is at least partially arranged in the first cleaning cavity and comprises a heating plate and a mirror reflection layer, the heating plate is provided with a heat conduction face facing the interior of the first cleaning cavity, and the mirror reflection layer is arranged on the heat conduction face and faces the interior of the first cleaning cavity; the mirror reflection layer is provided with an avoiding hole; the disinfection lamp is arranged on the heat conduction face and exposed to the first cleaning cavity through the receding hole, the disinfection light source and the heat source are integrated, energy loss can be slowed down, and therefore the drying and disinfection efficiency can be improved. And the mirror reflection layer plays a role in reflecting disinfection light in the cleaning cavity, so that the disinfection efficiency of the disinfection lamp is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to toothbrush cleaning technical field especially relates to a toothbrush sterilizer. BACKGROUND

[0002] Toothbrush is an important tooth cleaning tool in people's daily life. Toothbrush is usually stored in a warm and humid bathroom environment in an unused state, bacteria are more likely to breed on toothbrush, and oral diseases are easily caused. Therefore, it is necessary to disinfect and sterilize toothbrush regularly, and toothbrush sterilizer emerges as the times require. The existing toothbrush sterilizer mainly relies on heat energy and ultraviolet energy to dry and sterilize the toothbrush head at high temperature, but the current toothbrush sterilizer has the problem of large energy loss, and the efficiency of drying and sterilization needs to be improved. SUMMARY

[0003] The utility model solves at least one defect in the above background technical field, and provides an improved toothbrush sterilizer.

[0004] The utility model adopts the technical scheme in the technical solutions: a toothbrush sterilizer is constructed, which comprises a shell, a heating unit and at least one disinfection lamp; the shell has a first cleaning cavity; the heating unit is at least partially arranged in the first cleaning cavity, the heating unit comprises a heating plate and a mirror surface reflection layer, the heating plate has a heat conduction surface facing the inside of the first cleaning cavity, and the mirror surface reflection layer is arranged on the heat conduction surface and faces the inside of the first cleaning cavity; the mirror surface reflection layer has at least one avoiding hole; the disinfection lamp is arranged on the heat conduction surface and exposed to the first cleaning cavity through the avoiding hole.

[0005] In some embodiments, the heating unit further comprises an insulating layer and / or a waterproof layer arranged between the heat conduction surface and the mirror surface reflection layer.

[0006] In some embodiments, the toothbrush sterilizer further comprises a power supply unit arranged inside the shell; the heating plate comprises a substrate and a heating circuit arranged on the substrate, and the substrate is connected with the power supply unit.

[0007] In some embodiments, the shell further has a second cleaning cavity, the second cleaning cavity is located above the first cleaning cavity and communicates with the first cleaning cavity; a partition plate is arranged between the first cleaning cavity and the second cleaning cavity, the heating unit is located below the partition plate, and the partition plate isolates the heating unit and the second cleaning cavity.

[0008] In some embodiments, the toothbrush sterilizer further comprises a power supply unit, a main control board and a display; the power supply unit and the main control board are arranged inside the shell, and the main control board is connected with the power supply unit; the main control board is provided with a clock module, and the display is connected with the main control board and is used at least for displaying time information.

[0009] In some embodiments, the toothbrush sterilizer further comprises a human body detection unit, the human body detection unit comprises a radar sensor and / or an infrared sensor arranged on the main control board, and the main control board can control the display to be turned on or turned off according to a signal sent by the human body detection unit.

[0010] In some embodiments, the toothbrush sterilizer further comprises at least one adjusting key connected with the main control board, and the adjusting key is used for adjusting parameter information of the clock module.

[0011] In some embodiments, the toothbrush sterilizer further comprises a power supply unit, a main control board and a human body detection unit; the power supply unit and the main control board are arranged inside the shell, and the main control board is connected with the power supply unit; the human body detection unit comprises a radar sensor and / or an infrared sensor arranged on the main control board, and the main control board is connected with the sterilization lamp and can control the sterilization lamp to be turned on or turned off according to a signal sent by the human body detection unit.

[0012] In some embodiments, the toothbrush sterilizer further comprises a hanger arranged below the first cleaning cavity, and the hanger is provided with at least one hanging opening communicated with the first cleaning cavity; the hanger is detachably connected with the shell.

[0013] In some embodiments, the heating unit further comprises a temperature measuring module arranged on the heating plate; and / or the air-drying unit comprises an air inlet and an air outlet, the air inlet is formed on the shell, and the air outlet is located inside the shell; the external atmosphere, the air inlet, the air outlet and the first cleaning cavity are sequentially communicated.

[0014] The utility model has at least the following beneficial effects: the mirror surface reflection layer plays a role of reflecting sterilization light in the cleaning cavity based on the mirror surface reflection principle, and the mirror surface reflection usually reduces light energy loss compared with other reflection modes (such as diffuse reflection or rough surface reflection), so that the sterilization light is more efficiently utilized, and the sterilization efficiency of the sterilization lamp is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the utility model, the utility model will be further described below in conjunction with the drawings and embodiments, wherein:

[0016] Figure 1 is the toothbrush sterilizer in some embodiments of the utility model three-dimensional structure schematic view;

[0017] Figure 2 is Figure 1 the toothbrush sterilizer in another perspective view three-dimensional structure schematic view shown in figure 2;

[0018] Figure 3 is Figure 1 the longitudinal section structure schematic view of the toothbrush sterilizer shown in figure 3;

[0019] Figure 4 is the structure schematic view of the heating unit in some embodiments of the utility model;

[0020] Figure 5 is Figure 3 the exploded structure schematic view of the toothbrush sterilizer shown in figure 4;

[0021] Figure 6 is Figure 5 the three-dimensional perspective view of the toothbrush sterilizer of the exploded structure shown in figure 5;

[0022] Figure 7 is Figure 1 the exploded structure schematic view of the toothbrush sterilizer shown in figure 6. DETAILED DESCRIPTION

[0023] In order to have more clear understanding of the technical features, object and effect of the utility model, the specific implementation mode of the utility model will be described in detail by comparing with the drawings.

[0024] It should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" above the other element, or there can be one or more intervening elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] Please refer to Figures 1 to 4 The utility model discloses a toothbrush sterilizer, which comprises a shell 1, a heating unit 3 and at least one sterilization lamp 4. The shell 1 has a first cleaning cavity 10. The cleaning cavity is used for accommodating toothbrush heads, razors and the like. The heating unit 3 is at least partially arranged in the cleaning cavity. The heating unit 3, the air-drying unit and the sterilization lamp 4 jointly act on the toothbrush heads, razors and the like in the cleaning cavity to dry and sterilize and clean the toothbrush heads, razors and the like.

[0026] The heating unit 3 comprises a heating plate 30 and a mirror surface reflection layer 31. The heating plate 30 has a heat-conducting surface 301 facing the inside of the first cleaning cavity 10. The mirror surface reflection layer 31 is arranged on the heat-conducting surface 301 and faces the inside of the first cleaning cavity 10. The mirror surface reflection layer 31 has at least one avoidance hole 310. The sterilization lamp 4 is arranged on the heat-conducting surface 301 and exposed to the first cleaning cavity 10 through the avoidance hole 310. The number of the sterilization lamps 4 and the avoidance holes 310 is consistent, and the sterilization lamps 4 and the avoidance holes 310 correspond one by one. The sterilization lamp 4 can emit sterilization light to the inside of the cleaning cavity, and the sterilization light can be used to sterilize and disinfect the toothbrush heads. The sterilization light can include ultraviolet light (wavelength about 200-280nm), far ultraviolet light (wavelength about 200-230nm), blue light (wavelength about 405nm), UVA (wavelength about 315-400nm) and the like.

[0027] Specifically, the mirror surface reflection layer 31 can adopt a mirror surface material with high reflectivity such as bright stainless steel or other metal materials; the mirror surface reflection layer 31 can be a coating layer arranged on the heat conduction surface 301 or a flat plate attached to the heat conduction surface 301. The surface of the mirror surface reflection layer 31 facing the interior of the cleaning cavity is a smooth and flat surface, and the disinfection light emitted by the disinfection lamp 4 can be mirror reflected at the mirror surface reflection layer 31. The mirror surface reflection layer 31 can concentrate the disinfection light energy in a target area, for example, in the vicinity of the toothbrush head; the mirror surface reflection layer 31 plays a role of reflecting the disinfection light in the cleaning cavity based on the principle of mirror reflection, and mirror reflection generally reduces light energy loss compared to other reflection modes (such as diffuse reflection or rough surface reflection), thereby more efficiently utilizing the disinfection light and improving the disinfection efficiency of the disinfection lamp 4. Moreover, since the disinfection lamp 4 is arranged on the heat conduction surface 301 of the heat generation plate 30, the disinfection light source and the heat source are integrated together, which can slow down energy loss, thereby facilitating the improvement of the efficiency of drying and disinfection.

[0028] In some embodiments, the heat generation unit 3 further comprises an insulation layer (not shown) and a waterproof layer (not shown) arranged between the heat conduction surface 301 and the mirror surface reflection layer 31. The waterproof layer can include a nano coating and other waterproof material layers. The insulation layer can be an insulation sheet clamped between the heat conduction surface 301 and the mirror surface reflection layer 31; the insulation sheet can adopt materials such as silica gel, plastic, and glass fiber. The insulation sheet also needs to have good heat conduction performance. Among them, the waterproof layer is closer to the heat conduction surface 301 than the insulation layer. That is, the waterproof layer can be coated on the heat conduction surface 301 first, then the insulation sheet is arranged on the waterproof layer, and then the mirror surface reflection layer 31 is arranged on the insulation sheet. Alternatively, in other embodiments, the insulation layer and the waterproof layer can be selected alternatively. The insulation layer is used to prevent the circuit on the heat conduction surface 301 of the heat generation plate 30 from being in contact with the mirror surface reflection layer 31 to cause short circuit, and also can prevent the solder pad of the disinfection lamp 4 from being in contact with the mirror surface reflection layer 31 to cause short circuit.

[0029] Please refer to Figure 2 and Figure 3 , the U direction indicated by the arrow is the upward direction, and the D direction indicated by the arrow is the downward direction. As Figure 2 and Figure 3As shown, in some embodiments, the toothbrush sterilizer further comprises a hanger 5 disposed below the first cleaning cavity 10, the hanger 5 having at least one hanging opening 50 in communication with the first cleaning cavity 10. The hanging opening 50 is used to hang toothbrush heads, razors, and the like. The hanger 5 and the shell 1 are detachably connected. For example, the hanger 5 and the shell 1 can be connected by snap connection, magnetic connection, or the like. In this way, it is convenient to replace different types of hangers 5, and it is also convenient to detach the hanger 5 for cleaning. For example, in some embodiments, there are two types of hangers 5 according to different needs, the first type of hanger 5 has six hanging openings 50, and can hang six toothbrushes; the second type of hanger 5 has five hanging openings 50, and can hang four toothbrushes and one manual razor.

[0030] Please refer to Figure 3 、 Figure 5 and Figure 6 In some embodiments, the shell 1 further has a second cleaning cavity 11, which is located above the first cleaning cavity 10 and in communication with the first cleaning cavity 10. The second cleaning cavity 11 is used to place a mouthwash cup. A partition plate 12 is provided between the first cleaning cavity 10 and the second cleaning cavity 11, and the heating unit 3 is located below the partition plate 12, which isolates the heating unit 3 from the second cleaning cavity 11. Specifically, in the vertical direction, the partition plate 12 and the bottom surface of the first cleaning cavity 10 define a C-shaped isolation space, and the heating unit 3 is arranged in the isolation space, which can avoid the opening of the mouthwash cup, so as to avoid the water of the mouthwash cup from contacting the heating unit 3, and the safety is better. The partition plate 12 and the shell 1 can be an integrally formed structure. Alternatively, the partition plate 12 can also be an independent component installed in the interior of the shell 1.

[0031] Please refer to Figure 3 、 Figure 5 and Figure 6 In some embodiments, the toothbrush sterilizer further comprises a cup holder 6, which has at least one placing hole 60 matched with the shape of the mouthwash cup, and the mouthwash cup can be placed in the placing hole 60. The cup holder 6 is disposed in the second cleaning cavity 11 and abuts against the partition plate 12. Since the cup holder 6 directly contacts the mouthwash cup, water stains can be left on the cup holder 6, and the cup holder 6 and the second cleaning cavity 11 can be separated and can be detached for cleaning. As shown in the embodiments of Figure 1 and Figure 6 The cup holder 6 has three placing holes 60, and three mouthwash cups can be placed at the same time.

[0032] Please refer to Figure 7In some embodiments, the toothbrush sterilizer further comprises a power supply unit 7 arranged inside the housing 1. The power supply unit 7 can comprise a battery or the like. The power supply unit 7 is arranged at one side of the first cleaning cavity 10 and the second cleaning cavity 11 in the horizontal direction. The heating plate 30 comprises a substrate, a heating circuit arranged on the substrate, and the substrate is connected with the power supply unit 7. Specifically, the heating circuit can be formed on the substrate by etching, printing or the like. In some embodiments, the sterilization lamp 4 can be an ultraviolet lamp arranged on the substrate. Further, the ultraviolet lamp can be an ultraviolet LED welded on the first substrate. The first substrate can be an aluminum substrate.

[0033] Referring to Figure 7 In some embodiments, the toothbrush sterilizer further comprises a main control board 80 and a display 9. The main control board 80 is arranged inside the housing 1, and the main control board 80 is connected with the power supply unit 7. The main control board 80 has a clock module, and the display 9 is connected with the main control board 80, and the display 9 is used at least to display time information. The time information displayed by the display 9 can be sterilization countdown information or real-time time information. In this way, the toothbrush sterilizer also has the function of a clock, and the user can know the time through the toothbrush sterilizer when washing, thereby improving the user experience. Specifically, the clock module is an electronic component used to provide time signals, timing functions and synchronous control. The specific structure and circuit principle of the clock module can refer to the prior art. The outer surface of the housing 1 is provided with a light-transmitting plate 90, and the information displayed by the display 9 can be displayed to the user through the light-transmitting plate 90.

[0034] In some embodiments, the toothbrush sterilizer has three working modes. The normal mode is 150 seconds of sterilization + 8 minutes of air drying, that is, the sterilization lamp 4 works for 150 seconds + the fan 23 works for 8 minutes; the strong mode is 300 seconds of sterilization + 15 minutes of air drying and 50-degree drying, that is, the sterilization lamp 4 works for 300 seconds + the fan 23 and the heating body 2 work simultaneously for 15 minutes; the plug-in super strong mode is 600 seconds of sterilization + 30 minutes of air drying and 50-degree drying, that is, the sterilization lamp 4 works for 600 seconds + the fan 23 and the heating body 2 work simultaneously for 30 minutes. In addition to being used to display time information, the display 9 can also be used to display working mode information, and the working mode information can include the above three working mode information. In addition, the display 9 can also be used to display time information.

[0035] In some embodiments, the toothbrush sterilizer further comprises a human body detection unit, which comprises a radar sensor and / or an infrared sensor arranged on the main control board 80. That is, the toothbrush sterilizer can comprise at least one of a radar chip and an infrared sensor. The radar chip is a micro sensor based on radar frequency application. The radar chip can adopt an ultra-low power radar chip, which has a working frequency within the ISM frequency band of 5.8 GHz (i.e. 5.725 GHz~5.875 GHz), and integrates circuit modules such as voltage-controlled oscillator (VCO), radio frequency transmission (TX), radio frequency reception (RX), and intermediate frequency amplifier. The VCO output frequency point can be configured through the IIC (Inter-Integrated Circuit, Integrated Circuit Bus) interface, and the set frequency points are dispersed within the ISM frequency band of 5.8 GHz, and the number of frequency points can reach 32.

[0036] The main control board 80 can control the opening and closing of the display 9 according to the signal sent by the human body detection unit. Specifically, when the user approaches the toothbrush sterilizer, the human body detection unit detects the approaching signal and sends a corresponding signal to the main control board 80; the main control board 80 receives the signal sent by the human body detection unit, controls the display 9 to start, and the display 9 displays time information to the user. When the user moves away from the toothbrush sterilizer, the human body detection unit does not detect the approaching signal, and then the main control board 80 controls the display 9 to close. In this way, the toothbrush sterilizer can automatically display time information when the user approaches, and automatically close the display 9 when the user moves away to save energy consumption.

[0037] Please refer to Figure 7 In some embodiments, the toothbrush sterilizer further comprises at least one adjustment key 81 connected to the main control board 80, which is used to adjust the parameter information of the clock module for time calibration. As Figure 7 shown in the embodiment, there are two adjustment keys 81, which are respectively used to adjust hours and minutes. The two adjustment keys 81 are simple and easy to understand, which greatly improves the user experience.

[0038] Please continue to refer to Figure 6 and Figure 7 In some embodiments, the shell 1 comprises a front shell 131 and a rear shell 132, which are detachably connected together. The outer surface of the front shell 131 is provided with a light-transmitting plate 90, through which the information displayed by the display 9 can be displayed to the user. The side surface of the front shell 131 has two through holes 14, through which the two adjustment keys 81 are respectively exposed for user operation.

[0039] In some embodiments, the main control board 80 is also connected with the sterilization lamp 4, and the main control board 80 can control the opening and closing of the sterilization lamp 4 according to the signal sent by the human body detection unit. Specifically, the main control board 80 is connected with the heating plate 30, for example, the main control board 80 and the heating plate 30 can be connected together through wires. The sterilization lamp 4 is arranged on the heating plate 30, so the main control board 80 and the sterilization lamp 4 are also connected. When the user approaches the toothbrush sterilizer, the human body detection unit detects the approaching signal and sends a corresponding signal to the main control board 80; the main control board 80 receives the signal sent by the human body detection unit and controls the sterilization lamp 4 to be closed to prevent the sterilization light from causing adverse effects on the human body. When the user is away from the toothbrush sterilizer, the human body detection unit does not detect the approaching signal, and the main control board 80 controls the sterilization lamp 4 to be turned on. In this way, the toothbrush sterilizer can automatically pause the sterilization work when the user approaches to prevent the sterilization light (for example, ultraviolet light) from leaking and causing harm to the human body.

[0040] In some embodiments, the heating unit 3 further comprises a temperature measuring module arranged on the heating plate 30. For example, the temperature measuring module can comprise an NTC temperature sensor arranged on the heating plate 30. The main control board 80 is connected with the heating plate 30, the temperature measuring module can obtain the real-time temperature of the heating plate 30 and send the temperature information to the main control board 80 in the form of electrical signal. The temperature information can also be displayed on the display 9, that is, the display 9 can also be used to display the temperature information. When the toothbrush sterilizer is in the working state, the display 9 can switch to display the heating temperature, and the user can directly see the internal heating condition to ensure the effectiveness of the sterilization and drying process.

[0041] In some embodiments, the main control board 80 can control the heating of the heating plate 30 by using a pulse square wave signal. For example, the main control board 80 can use a square wave signal with a frequency of 25 kHz (i.e., 25,000 Hz) to power the heating plate 30, which can improve the power supply efficiency and reduce the consumption of the battery. In some embodiments, the software PWM is also used to drive the MOS tube on the main control board 80 to achieve precise heating control, so that the heating plate 30 can work according to the preset temperature and time to meet the drying requirements in different working modes.

[0042] As Figure 2 and Figure 7As shown, in some embodiments, the toothbrush sterilizer further comprises a drying unit, the drying unit comprising an air inlet 21 formed on the shell 1 and an air outlet 22 located inside the shell 1. The external atmosphere, the air inlet 21, the air outlet 22 and the first cleaning cavity 10 are sequentially connected in communication, thereby constituting an air duct for realizing air circulation in the cleaning cavity and accelerating water evaporation in the cleaning cavity. Further, the drying unit further comprises a fan 23 arranged inside the shell 1, and the air outlet of the fan 23 serves as the air outlet 22. That is, the air outlet of the fan 23 faces the inside of the first cleaning cavity 10.

[0043] It can be understood that the above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some deformations and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A toothbrush sanitizer characterized by, The toothbrush sterilizer comprises a shell (1), a first cleaning cavity (10) in the shell (1), a heating unit (3) arranged at least partially in the first cleaning cavity (10), the heating unit (3) comprising a heating plate (30) having a heat-conducting surface (301) facing the inside of the first cleaning cavity (10) and a mirror surface reflecting layer (31) arranged on the heat-conducting surface (301) and facing the inside of the first cleaning cavity (10), the mirror surface reflecting layer (31) having at least one avoiding hole (310), and at least one sterilization lamp (4) arranged on the heat-conducting surface (301) and exposed to the first cleaning cavity (10) through the avoiding hole (310). The heating unit (3) further comprises an insulating layer and / or a waterproof layer arranged between the heat-conducting surface (301) and the mirror surface reflecting layer (31). The toothbrush sterilizer further comprises a power supply unit (7) arranged in the shell (1), the heating plate (30) comprises a substrate and a heating circuit arranged on the substrate, and the substrate is connected with the power supply unit (7). The shell (1) further comprises a second cleaning cavity (11) arranged above and in communication with the first cleaning cavity (10), a partition plate (12) arranged between the first cleaning cavity (10) and the second cleaning cavity (11), and the heating unit (3) is arranged below the partition plate (12) and separated from the second cleaning cavity (11) by the partition plate (12).

2. The toothbrush sanitizer of claim 1, wherein, The toothbrush sterilizer further comprises a power supply unit (7), a main control board (80) and a display (9).

3. The toothbrush sanitizer of claim 1, wherein, The power supply unit (7) and the main control board (80) are arranged in the shell (1), and the main control board (80) is connected with the power supply unit (7).

4. The toothbrush sanitizer of claim 1, wherein, The main control board (80) has a clock module, the display (9) is connected with the main control board (80), and the display (9) is used at least for displaying time information.

5. The toothbrush sanitizer of claim 1, wherein, The toothbrush sterilizer further comprises a human body detection unit comprising a radar sensor and / or an infrared sensor arranged on the main control board (80), and the main control board (80) can control the opening and closing of the display (9) according to the signal sent by the human body detection unit. The toothbrush sterilizer further comprises at least one adjusting key (81) connected with the main control board (80), and the adjusting key (81) is used for adjusting the parameter information of the clock module. The toothbrush sterilizer further comprises a power supply unit (7), a main control board (80) and a human body detection unit.

6. The toothbrush sanitizer of claim 5, wherein, The power supply unit (7) and the main control board (80) are arranged in the shell (1), and the main control board (80) is connected with the power supply unit (7).

7. The toothbrush sanitizer of claim 5, wherein, ​ 8. The toothbrush sanitizer of claim 1, wherein, ​ ​ The human body detection unit comprises a radar sensor and / or an infrared sensor arranged on the main control board (80) connected with the sterilization lamp (4), and the main control board (80) can control the opening and closing of the sterilization lamp (4) according to the signal sent by the human body detection unit.

9. The toothbrush sanitizer of claim 1, wherein, The toothbrush sterilizer further comprises a hanger (5) arranged below the first cleaning cavity (10), the hanger (5) has at least one hanging opening (50) communicated with the first cleaning cavity (10); and the hanger (5) and the shell (1) are detachably connected.

10. The toothbrush sanitizer of claim 1, wherein, The heating unit (3) further comprises a temperature measurement module arranged on the heating plate (30). And / or, the toothbrush sterilizer further comprises a air-drying unit, the air-drying unit comprises an air inlet (21) and an air outlet (22), the air inlet (21) is formed on the shell (1), and the air outlet (22) is located in the interior of the shell (1); the external atmosphere, the air inlet (21), the air outlet (22) and the first cleaning cavity (10) are sequentially communicated.

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