Humidifier

Abstract

The embodiment of the utility model provides a humidifier, and belongs to the technical field of humidifying equipment, the humidifier comprises a base and a mounting shell arranged on the base in a surrounding mode, and a water tank device and an air duct device are arranged in the mounting shell; an air outlet net is arranged at the other end, away from the base, of the mounting shell, the air duct device is arranged on the base, and the water tank device is arranged at the top of the air duct device; a controller is arranged on one side of the mounting shell, and an air inlet is formed in the side, away from the controller, of the mounting shell; the humidifier comprises a heater and a temperature sensor; the water tank device comprises a water tank, the heater and the temperature sensor are arranged on the side, close to the air duct device, of the bottom of the water tank, the heater is used for heating water in the water tank, and the temperature sensor is used for detecting the temperature value of the water in the water tank; the controller is used for receiving the temperature value detected by the temperature sensor and controlling the heater to be turned on and turned off according to the temperature value. By means of the humidifier, the problem that a machine is damaged due to the fact that the temperature is too high during heating is solved.

Description

Technical Field

[0001] The present application relates to the technical field of humidification equipment, and in particular to a humidifier. Background Art

[0002] As people's living standards improve, they pay more and more attention to the quality of life and the quality of the working environment. Autumn and winter are the driest seasons of the year, especially in the north and places where air conditioners are used for a long time. The air is very dry, so humidification equipment is needed to increase the humidity of the air. Humidifiers are fashionable small appliances that can bring fresh and moist air to the home environment, and are therefore becoming more and more popular.

[0003] Currently, when a humidifier is used in winter, the water temperature is too low, which affects the humidification speed. Therefore, the water temperature needs to be heated to increase the humidification speed. During the water heating process, excessively high temperature can easily damage the humidifier. Utility Model Content

[0004] The present application provides a humidifier, aiming to solve the problem of damage to the machine caused by excessive temperature during heating.

[0005] The first aspect of the present application provides a humidifier, comprising:

[0006] A base and a mounting shell arranged around the base, wherein a water tank device and an air duct device are arranged in the mounting shell;

[0007] An air outlet net is arranged on the other end of the mounting shell away from the base, the air duct device is arranged on the base, the water tank device is arranged on the top of the air duct device, and the top of the water tank device is connected to the air outlet net;

[0008] A controller is provided on one side of the installation shell at a position corresponding to the water tank device, and an air inlet is provided on a side of the installation shell away from the controller, and the air inlet corresponds to the position of the air duct device;

[0009] The humidifier comprises a heater and a temperature sensor;

[0010] The water tank device comprises a water tank, a first through hole and a second through hole are formed at the bottom of the water tank, the heater covers the first through hole, the temperature sensor covers the second through hole, the heater and the temperature sensor are both located on one side of the bottom of the water tank close to the air duct device, the heater is used to heat the water in the water tank, and the temperature sensor is used to detect the temperature value of the water in the water tank;

[0011] The controller is connected to the heater and the temperature sensor, and is used to receive a temperature value detected by the temperature sensor and control the heater to be turned on and off according to the temperature value.

[0012] Optionally, the temperature value includes a first temperature threshold and a second temperature threshold;

[0013] The controller controls the heater to turn on based on the temperature value being less than the first temperature threshold;

[0014] The controller controls the heater to be turned off based on the temperature value being greater than or equal to the second temperature threshold.

[0015] Optionally, the first temperature threshold is 60°C, and the second temperature threshold is 65°C.

[0016] Optionally, the heater comprises a PTC heating sheet.

[0017] Optionally, the mounting shell includes a first mounting shell and a second mounting shell, the first mounting shell and the second mounting shell enclose a mounting cavity, the mounting cavity is used to install the water tank device and the air duct device, the controller is arranged on the first mounting shell, and the air inlet is arranged on the second mounting shell.

[0018] Optionally, the water tank device includes a tray, which is arranged on the water tank, a magnet is arranged at the bottom of the tray, a reed switch is arranged at the bottom of the water tank, the position of the reed switch corresponds to the magnet, the reed switch is connected to the heater, when the reed switch senses the magnet, the reed switch is in an open state, and when the reed switch does not sense the magnet, the reed switch is in a closed state.

[0019] Optionally, the air duct device includes a motor, an air duct bracket, a wind wheel and a filter, one end of the filter is connected to the base, the wind wheel is arranged on an end of the filter away from the base, the motor is arranged on an end of the wind wheel away from the filter, the air duct bracket is arranged on the wind wheel in a circumferential manner, and there is a gap between the air duct bracket and the wind wheel.

[0020] Optionally, the humidifier includes an ultraviolet lamp, a third through hole is opened at the bottom of the water tank, the ultraviolet lamp covers the third through hole, and the ultraviolet lamp is located on one side of the bottom of the water tank close to the air duct device.

[0021] Beneficial effects:

[0022] The present application provides a humidifier, comprising a base and a mounting shell circumferentially arranged on the base, a water tank device and an air duct device being arranged in the mounting shell, the air duct device being arranged on the base, the water tank device being arranged on the top of the air duct device, an air outlet net being further arranged at one end of the mounting shell away from the base, the top of the water tank device being connected to the air outlet net; the humidifier comprises a heater and a temperature sensor, the water tank device comprises a water tank, the heater and the temperature sensor are both arranged on a side of the bottom of the water tank close to the air duct device, a controller is arranged on one side of the mounting shell, the controller is located at a position corresponding to the water tank device, an air inlet is arranged on the other side of the mounting shell away from the controller, the air inlet corresponds to the position of the air duct device, the controller is connected to the heater and the temperature sensor, the heater is used to heat the water in the water tank, the temperature sensor is used to detect the temperature of the water in the water tank, the controller receives the temperature value detected by the temperature sensor, and controls the heater to be turned on or off based on the received temperature value.

[0023] When using the humidifier, during the process of heating the water in the water tank with the heater, the temperature sensor detects the temperature of the water, and the controller receives the detected temperature value. The controller controls the heater to be turned on or off according to the received temperature value, so that the temperature of the water in the water tank is within a certain temperature range, thereby avoiding the situation where the temperature is too high. As a result, the temperature of the water will not rise to a very high temperature, and the situation where the temperature is too high during heating and damage to the machine can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 is a structural schematic diagram of a humidifier proposed in one embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of an installation shell and a base in a humidifier proposed in an embodiment of the present application;

[0027] Figure 3 It is a structural schematic diagram of a heater and a temperature sensor in a humidifier proposed in one embodiment of the present application;

[0028] Figure 4 It is a structural schematic diagram of a water tank and a tray in a humidifier proposed in an embodiment of the present application;

[0029] Figure 5 It is a structural schematic diagram of an air duct device in a humidifier proposed in one embodiment of the present application.

[0030] Description of reference numerals:

[0031] 1. Base; 11. Air outlet; 12. Line hole; 13. Power cord; 2. Mounting shell; 21. First mounting shell; 22. Second mounting shell; 23. Controller; 24. Air inlet; 25. Air outlet net; 26. Handle; 3. Air duct device; 31. Filter; 32. Wind wheel; 33. Motor; 331. Motor body; 332. Motor shaft; 34. Wind wheel bracket; 4. Water tank device; 41. Water tank; 411. Heater; 412. Temperature sensor; 413. Ultraviolet lamp; 414. Reed switch; 42. Tray; 421. Magnet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Embodiment 1

[0034] The present application embodiment discloses a humidifier, such as Figure 1 As shown, the humidifier includes a base 1 and a mounting shell 2 circumferentially arranged on the base 1 , wherein an air duct device 3 and a water tank device 4 are arranged in the mounting shell 2 , wherein the air duct device 4 is placed on the base 1 , and the water tank device 4 is placed on top of the air duct device 3 .

[0035] The humidifier provided in the embodiment of the present application sucks the air of the external environment into the humidifier through the air duct device 3, then humidifies the air in the humidifier with the water of the water tank device 4, and then discharges the humidified air to the external environment, thereby achieving humidification of the air.

[0036] Specifically, Figure 2 As shown, an air vent 11 is provided on one side of the base 1, and air from the external environment can enter the humidifier through the air vent 11; a circuit hole 12 is provided on the other side of the base 1 away from the air vent 11, and a power cord 13 is passed through the circuit hole 12, one end of the power cord 13 is connected to a power supply for the humidifier, and the other end of the power cord 13 away from the power supply is connected to the circuit inside the humidifier.

[0037] An air outlet net 25 is provided on the other end of the installation shell 2 away from the base 1. The diameter of the air outlet net 25 is consistent with the end opening diameter of the end of the installation shell 2 where the air outlet net 25 is provided. The top of the water tank device 4 is connected to the air outlet net 25, and the air humidified by the humidifier is discharged into the external environment through the air outlet net 25.

[0038] On one side of the mounting shell 2, a controller 23 is arranged at a position corresponding to the water tank device 4, the controller 23 and the air outlet 11 of the base 1 are on the same side, and the controller 23 is connected to the power cord 13 through a line; an air inlet 24 is arranged on the other side of the mounting shell 2 away from the controller 23, the position of the air inlet 24 corresponds to the position of the air duct device 3, and the air inlet 24 and the power cord 13 of the base 1 are on the same side, and the air from the external environment enters the humidifier through the air inlet 24; a handle 26 is arranged on the mounting shell 2 near the air outlet net 25, and the handle 26 is located on the side of the mounting shell 2 away from the water tank device 4. When the humidifier needs to be moved, the handle can be directly lifted, making it more convenient to move the humidifier.

[0039] In the embodiments of the present application, Figure 2 As shown, the mounting shell 2 includes a first mounting shell 21 and a second mounting shell 22. The first mounting shell 21 and the second mounting shell 22 enclose a mounting cavity, and the mounting cavity is used to install the air duct device 3 and the water tank device 4. The first mounting shell 21 and the second mounting shell 22 are placed on the base 1 after being enclosed.

[0040] In detail, the controller 23 is arranged on the first mounting shell 21, and a mounting hole is opened on the first mounting shell 21. The position of the mounting hole corresponds to the position of the water tank device 4, and the mounting hole is close to the air outlet network 25. The mounting hole is used to install the controller 23; the air inlet 24 is arranged on the second mounting shell 22, and the position of the air inlet 24 corresponds to the position of the air duct device 3.

[0041] In the embodiments of the present application, Figure 1 and Figure 3 As shown, the humidifier further includes a heater 411 and a temperature sensor 412. The water tank device 4 of the humidifier includes a water tank 41. The bottom of the water tank 41 is connected to the top of the air duct device 3. The bottom of the water tank 41 is provided with a first through hole and a second through hole. The first through hole and the second through hole are both located near the center of the bottom of the water tank 41. There is a gap between the first through hole and the second through hole. The diameter of the first through hole is greater than the diameter of the second through hole. The heater 411 and the temperature sensor 412 are both located on the bottom of the water tank 41 on one side near the air duct device 3. The heater 411 covers the first through hole, and the diameter of the heater 411 is larger than the diameter of the first through hole. The temperature sensor 412 covers the second through hole, and the diameter of the temperature sensor 412 is larger than the diameter of the second through hole. When there is water in the water tank 41, the heater 411 can contact the water in the water tank 41 through the first through hole, and the temperature sensor 412 can contact the water in the water tank 41 through the second through hole.

[0042] Furthermore, the heater 411 is connected to the controller 23 via a line, and the controller 23 can control the heater 411 to be in an on state or an off state. The heater 411 is connected to the power cord 13 via a line, and the power is supplied to the heater 411 via the power cord 13; the heater 411 is used to heat the water in the water tank 41, and the humidification efficiency of the humidifier can be improved by the heating of the heater 411.

[0043] The temperature sensor 412 is connected to the power line 13 by a line, and the power supply supplies power to the temperature sensor 412 through the power line 13. The temperature sensor 412 is used to detect the temperature value of the water in the water tank 41; the temperature sensor 412 is also connected to the controller 23 by a line, and the controller 23 receives the temperature value detected by the temperature sensor 412, and the temperature value is set with a first temperature threshold and a second temperature threshold. After receiving the temperature value, the controller 23 compares the received temperature value with the first temperature threshold and the second temperature threshold. When the temperature value is less than the first temperature threshold, the controller 23 controls the heater 411 to turn on, and when the temperature value is greater than or equal to the second temperature threshold, the controller 23 controls the heater 411 to turn off. In this way, the temperature of the water in the water tank 41 can be controlled within the range from the first temperature threshold to the second temperature threshold, thereby avoiding the situation where the humidifier is damaged due to excessive temperature during heating.

[0044] In detail, the first temperature threshold can be set to 60°C, and the second temperature threshold can be set to 65°C. When the humidifier is powered on, the heater 411 is in the off state by default. At this time, the temperature sensor 412 detects that the temperature of the water in the water tank 41 is less than 60°C. After receiving this temperature value, the controller 23 controls the heater 411 to turn on, and the heater 411 starts to heat the water in the water tank 41. During the heating process, the temperature sensor 412 detects the temperature value of the water in real time. After heating for a period of time, when the controller 23 receives that the temperature value detected by the temperature sensor 412 is greater than or equal to 65°C, the controller 23 controls the heater 411 to turn off, the heater 411 no longer heats, and the temperature of the water gradually decreases. When the controller 23 receives that the temperature value detected by the temperature sensor 412 drops to less than 60°C, the controller 23 controls the heater 411 to turn on again, and so on. During the heating process, the temperature value of the water in the water tank 41 can be maintained in the threshold range of 60°C to 65°C.

[0045] Furthermore, the heating temperature is controlled within the threshold range of 60°C to 65°C. This temperature range can not only improve the humidification efficiency, but also is close to the temperature of pasteurization and the hot spot of general bacteria, which can achieve the effect of sterilization. Moreover, this temperature range will not damage the humidifier or cause harm to human skin.

[0046] The humidifier provided in the embodiment of the present application detects the temperature value of the water in the water tank 41 through the temperature sensor 412 when it is necessary to heat the water in the water tank 41. After receiving the temperature value, the controller 23 first compares it with the set first temperature threshold and second temperature threshold, and then controls the heater 411 to be turned on or off based on the comparison result, so that the water temperature can be controlled within the range of the first temperature threshold to the second temperature threshold, for example, within the threshold range of 60°C to 65°C. This can not only improve the humidification efficiency by using heating, but also ensure that the temperature will not be too high during heating, thereby protecting the humidifier.

[0047] In an embodiment of the present application, the heater 411 can be a PTC heating plate, which has its own thermostat. When the temperature of the PTC heating plate reaches 150°C, the thermostat automatically disconnects the heating function of the PTC heating plate. This can effectively protect the PTC heating plate, avoid damage to the PTC heating plate due to excessive temperature, and extend the service life of the PTC heating plate.

[0048] In the embodiments of the present application, Figure 3 As shown, the humidifier is provided with an ultraviolet lamp 413, and a third through hole is opened at the bottom of the water tank 41 of the humidifier, and the third through hole is located near the center of the bottom of the water tank 41. The ultraviolet lamp 413 covers the third through hole. The diameter of the ultraviolet lamp 413 is larger than the diameter of the third through hole, and the ultraviolet lamp 413 is located on the bottom of the water tank 41 on one side close to the air duct device 3; the ultraviolet lamp 413 can contact the water in the water tank 41 through the third through hole, and the ultraviolet lamp 413 is used to disinfect and sterilize the water in the water tank 41 and the air inside the humidifier, thereby enhancing the purification effect of the humidifier.

[0049] In the embodiments of the present application, Figure 3 and Figure 4 As shown, the water tank device 4 of the humidifier includes a tray 42, and the tray 42 is located in the water tank 41. A magnet 421 is arranged at the bottom of the tray 42, and a mounting hole is opened at the bottom of the tray 42, and the mounting hole is used to install the magnet 421; a reed switch 414 is arranged at the bottom of the water tank 41, and a mounting groove is opened on the side of the bottom of the water tank 41 away from the tray 42, and the mounting groove is used to install the reed switch 414, and the position of the magnet 421 corresponds to the position of the reed switch 414, and the reed switch 414 is connected to the heater 411 through a line.

[0050] Furthermore, when the tray 42 is in contact with the water tank 41, the reed switch 414 senses the magnet 421, and the reed switch 414 is in the on state, so that the reed switch 414 is turned on, and then the heater 411 is in the on state, and the heater 411 starts heating; when the tray 42 is separated from the water tank 41, the reed switch 414 does not sense the magnet 421, the reed switch 414 is in the off state, and the reed switch 414 is disconnected, and then the heater 411 is also in the off state, and the controller 23 cannot control the heater 411 to turn on, and at this time the heater 411 cannot heat the water tank 41.

[0051] In detail, the water tank device 4 includes a water tank, which is located in the tray 42. The water tank is used to provide water to the water tank 41. The water in the water tank can reach the water tank 41 only when the tray 42 is in contact with the water tank 41. By arranging a magnet 421 at the bottom of the tray 42 and a reed switch 414 at the bottom of the water tank 41, the heater 411 can only be turned on when the tray 42 is located in the water tank 41, that is, the heater 411 can only be turned on when there is water in the water tank 41, and when the tray 42 is separated from the water tank 41, there will be no water in the water tank 41. At this time, the heater 411 will be turned off, and the controller 23 will not be able to turn on the heater 411; in this way, when the heater 411 starts working, when there is no water in the water tank 41, the water tank 41 will not continue to be heated, thereby avoiding the situation where the machine is damaged because the heater 411 only heats the water tank 41.

[0052] In the embodiments of the present application, Figure 5 As shown, the air duct device 3 includes a motor 33, an air duct bracket 34, a wind wheel 32 and a filter 31. The filter 31 is placed on the base 1. The position of the air inlet 24 opened on the mounting shell 2 corresponds to the position of the filter 31, and the height of the filter 31 is consistent with the height of the air inlet 24. The material of the filter 31 includes PP primary filter, high-efficiency composite filter and activated carbon filter and other materials. The filter made of these materials has an efficiency of filtering particles with a particle size of 0.3um higher than 99.9%. The air from the external environment enters the humidifier from the air inlet. First, the air will pass through the filter 31. The filter 31 purifies the air and filters out some impurities contained in the air, so that the air in the humidifier is cleaner than the air in the external environment. The air discharged after humidification by the humidifier is also cleaner than the air in the external environment. The filter 31 plays a role in purifying the air.

[0053] Furthermore, the wind wheel 32 of the air duct device 3 is connected to the other end of the filter 31 away from the base 1, and the motor 33 is arranged on the end of the wind wheel 32 away from the filter 31. The motor 33 includes a motor shaft 332 and a motor body 331 circumferentially arranged around the motor shaft 332. A mounting hole is opened at the center of the wind wheel 32, and the motor shaft 332 is installed on the mounting hole, and the motor body 331 contacts the bottom of the water tank 41 of the water tank device 4. The motor 33 supplies power to the wind wheel 32 so that the wind wheel 32 can rotate; the air duct bracket 34 is circumferentially arranged on the wind wheel 32, and there is a gap between the wind wheel 32 and the air duct bracket 34. The air in the humidifier can flow through this gap and reach the water tank device 4.

[0054] When the humidifier is powered on, the motor 33 is turned on, and the motor 33 supplies power to the wind wheel 32 to make the wind wheel 32 rotate. The wind wheel 32 draws air from the external environment into the humidifier from the air inlet 24. The air is first purified by the filter, and then passes through the gap between the air duct bracket 34 and the wind wheel 32. The rotation of the wind wheel 32 makes the air reach the water tank device 4, and the water tank device 4 humidifies the air. Finally, the humidified air is discharged from the air outlet network 25 to the external environment, thereby achieving humidification of the external environment.

[0055] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. Without more restrictions, an element defined by the phrase "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device comprising the element.

[0057] The technical solution provided by the present application is described in detail above. The principle and implementation method of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. A humidifier, It is characterized in that include: A base and a mounting shell arranged around the base, wherein a water tank device and an air duct device are arranged in the mounting shell; An air outlet net is arranged on the other end of the mounting shell away from the base, the air duct device is arranged on the base, the water tank device is arranged on the top of the air duct device, and the top of the water tank device is connected to the air outlet net; A controller is provided on one side of the installation shell at a position corresponding to the water tank device, and an air inlet is provided on a side of the installation shell away from the controller, and the air inlet corresponds to the position of the air duct device; The humidifier comprises a heater and a temperature sensor; The water tank device comprises a water tank, a first through hole and a second through hole are formed at the bottom of the water tank, the heater covers the first through hole, the temperature sensor covers the second through hole, the heater and the temperature sensor are both located on one side of the bottom of the water tank close to the air duct device, the heater is used to heat the water in the water tank, and the temperature sensor is used to detect the temperature value of the water in the water tank; The controller is connected to the heater and the temperature sensor, and is used to receive a temperature value detected by the temperature sensor and control the heater to be turned on or off according to the temperature value.

2. The humidifier according to claim 1, It is characterized in that The temperature value includes a first temperature threshold and a second temperature threshold; The controller controls the heater to turn on based on the temperature value being less than the first temperature threshold; The controller controls the heater to be turned off based on the temperature value being greater than or equal to the second temperature threshold.

3. The humidifier according to claim 2, It is characterized in that The first temperature threshold is 60°C, and the second temperature threshold is 65°C.

4. The humidifier according to claim 1, It is characterized in that The heater includes a PTC heating sheet.

5. The humidifier according to claim 1, It is characterized in that The mounting shell includes a first mounting shell and a second mounting shell. The first mounting shell and the second mounting shell are combined to form a mounting cavity. The mounting cavity is used to install the water tank device and the air duct device. The controller is arranged on the first mounting shell, and the air inlet is arranged on the second mounting shell.

6. The humidifier according to claim 1, It is characterized in that The water tank device includes a tray, which is arranged on the water tank. A magnet is arranged at the bottom of the tray. A reed switch is arranged at the bottom of the water tank. The position of the reed switch corresponds to the magnet. The reed switch is connected to the heater. When the reed switch senses the magnet, the reed switch is in an open state. When the reed switch does not sense the magnet, the reed switch is in a closed state.

7. The humidifier according to claim 1, It is characterized in that The air duct device includes a motor, an air duct bracket, a wind wheel and a filter, one end of the filter is connected to the base, the wind wheel is arranged on the end of the filter away from the base, the motor is arranged on the end of the wind wheel away from the filter, the air duct bracket is arranged on the wind wheel in a circumferential manner, and there is a gap between the air duct bracket and the wind wheel.

8. The humidifier according to claim 1, It is characterized in that The humidifier comprises an ultraviolet lamp. A third through hole is formed at the bottom of the water tank. The ultraviolet lamp covers the third through hole. The ultraviolet lamp is located on one side of the bottom of the water tank close to the air duct device.

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