JP7488203B2 - Humidification device - Google Patents

Description

This invention relates to a humidifier that supplies humidified air containing mist to a room.

In the past, this type of humidifier included a water storage chamber that stores water in the main body of the device, a humidified air generating means installed in the water storage chamber to generate humidified air, a blower fan that blows the humidified air generated by the humidified air generating means into the room from an air outlet, and a water supply pump installed in the water supply pipe that supplies water to the water storage chamber. In this case, when the water level sensor installed in the water storage chamber malfunctions for some reason and is unable to detect that the water is full, the water supply pump continues to operate and the water supply to the water storage chamber does not stop, but an overflow pipe connection port is formed on the wall of the water storage chamber to drain the water in the water storage chamber, and the structure allows water to be drained via the overflow pipe even if the water level sensor malfunctions, preventing water from overflowing from the water storage chamber. (For example, Patent Document 1)

JP 2018-165581 A

However, with this conventional system, when the blower fan was activated, air flowed into the overflow pipe connected to the water storage chamber, and a whistling noise was generated when the air came out from the tip outlet of the overflow pipe, which could be unpleasant for the user.

In order to solve the above problems, in claim 1 of the present invention, there is provided an appliance body , an intake port for drawing in air outside the appliance body, an air blowing path through which the air that has passed through the intake port flows, a water storage chamber for storing water and having a water storage chamber inlet through which the air in the air blowing path flows, an air blowing fan installed in the appliance body for blowing the air drawn in from the intake port through the air blowing path and into the water storage chamber from the water storage chamber inlet, mist generating means for generating mist from the water in the water storage chamber, an overflow pipe connected to a wall surface of the water storage chamber for draining water that has exceeded a predetermined water level , a heater for heating the water in the water storage chamber, and a heater connected to a bottom of the water storage chamber for heating the water in the water storage chamber. The device comprises a drain pipe for draining water to the outside, a drain valve for switching whether or not water from the water storage chamber is allowed to flow into the drain pipe, a three-way branch joint for connecting the overflow pipe to the drain pipe downstream of the drain valve, and a control unit for controlling a mist operation in which humidified air containing mist generated in the water storage chamber is blown by the blower fan, and a throttling mechanism for reducing the inner diameter of the overflow pipe is located immediately adjacent to the joint of the overflow pipe, and the control unit opens the drain valve to drain the water in the water storage chamber that has been heated to a predetermined temperature by switching the heater ON/OFF .

In addition, in claim 2 , the mist generating means is characterized in that it is composed of a rotating body that pumps up the water in the water storage chamber by rotating and scatters it toward the outer periphery, a mist motor connected to a drive shaft that is supported so that the rotating body can rotate, and a collision body against which the water scattered by the rotating body collides.

According to this invention, a throttle mechanism is provided to reduce the inner diameter of the overflow pipe, which reduces the wind speed of the air passing through the tip outlet of the overflow pipe and prevents the generation of a whistling sound.

In addition, a joint is provided to connect the drain pipe, which is connected to the water storage chamber and drains the stored water, to the overflow pipe, and the throttling mechanism is located immediately adjacent to the joint. As the stored water heated by the heater is drained while passing through the joint, the throttling mechanism located immediately adjacent to the joint is heated by the heat generated by the drainage, and the formation of biofilm on the throttling mechanism can be suppressed.

The mist generating means is composed of a rotor that draws up water in the water storage chamber by rotating and scatters it in the outer circumferential direction, a mist motor connected to a drive shaft that is supported so that the rotor can rotate, and a collision body that generates fine mist and large-diameter mist when the water scattered by the rotor collides with the collision body. This simple configuration of drawing up water in the water storage chamber with the rotor and causing it to collide with the collision body can generate a large amount of humidified air containing mist.

FIG. 1 is a perspective view illustrating an external appearance of an embodiment of the present invention. Schematic diagram of the embodiment. FIG. 2 is a control block diagram of the embodiment. FIG. 2 is a diagram illustrating an operation unit according to the embodiment. A flowchart explaining the operation from the start to the end of the operation of the embodiment. FIG. 13 is a perspective view illustrating an air flow path in the device body of the embodiment. FIG. 4 is a partial enlarged view illustrating an air flow path in the overflow pipe according to the embodiment; FIG. 4 is a cross-sectional view illustrating the structure of a throttle mechanism and a joint according to the embodiment.

Next, a humidifier according to one embodiment of the present invention will be described with reference to the drawings.

In the following description, "front," "rear," "up," "down," "right," and "left" follow the definitions in Figures 1, 2, and 6 to 8. The up-down direction corresponds to the vertical direction when the device body 1 is installed. The front-rear direction and the left-right direction correspond to the horizontal direction when the device body 1 is installed.

1 is the main body of the device, 2 is an air outlet formed on the top of the device body 1 so as to be parallel to the front of the device body 1 and equipped with multiple louvers 3, 4 is an upper panel that forms the upper part of the front of the device body 1, 5 is a lower panel that forms the lower part of the front of the device body 1, 6 is an operation unit equipped with multiple switches that issue various operation commands, and 7 is a breaker cover that hides a breaker (not shown).

8 is a water storage chamber located at approximately the middle height position within the device body 1, which stores a predetermined amount of water. Inside this water storage chamber 8 is a cylindrical rotor 10 whose lower end is submerged in water and supported by a drive shaft 9.

The rotor 10 is a hollow inverted cone whose circumference gradually expands upward. When the mist motor 11, which is connected to the drive shaft 9 and drives the rotor 10 to rotate, is driven, the centrifugal force of the rotor 10 causes the water in the water storage chamber 8 to be pumped up and pushed up along the outer and inner walls of the rotor 10, causing the water to be scattered around along the outer wall of the rotor 10, and the water that has been pushed up along the inner wall of the rotor 10 is scattered outward from multiple scattering ports (not shown) formed at the upper end of the rotor 10.

12 is a cylindrical porous body located at a predetermined distance from the upper outer periphery of the rotor 10 and rotates with the rotor 10. The porous body 12 has a porous section 13 formed as an impact body on its entire circumferential wall and made of a number of slits, wire mesh, punched metal, etc. The rotor 10, mist motor 11, and porous section 13 constitute a mist generating means, which can generate a large amount of humidified air containing mist with a simple structure, and can be easily assembled and at low cost, as it is only necessary to assemble the mist motor 11 and the drive shaft 9.

The mist motor 11 that constitutes the mist generating section is driven, and the centrifugal force generated by rotating the rotor 10 draws up the water in the water storage chamber 8 and scatters the air. The water droplets that pass through the porous section 13 are crushed, and the water is atomized to produce a large amount of mist with a particle size of nanometers (nm) (hereinafter, fine mist), as well as water droplets with a relatively large particle size (hereinafter, large mist). The Leonard effect caused by the atomization of the water causes the fine mist to be charged with negative ions, and the large mist to be charged with positive ions.

14 is a blower fan that is installed inside the lower panel 5 and is driven at a predetermined rotation speed to suck in dry air from the room and blow it upwards to the appliance body 1. 15 is an airflow path that guides the air blown by the blower fan 14 to the water storage chamber 8 through the side of the mist motor 11 and to the water storage chamber inlet 16 through which air can flow into the water storage chamber 8, and the dry air sucked in from the bottom of the appliance body 1 is guided to the top of the appliance body 1 through the airflow path 15 and flows into the water storage chamber 8.

Reference numeral 17 denotes an air-water separation air duct connected to the other end (left side) above the water storage chamber 8 so that the flow path faces vertically upward, through which humidified air containing fine mist and large-diameter mist generated in the water storage chamber 8 flows, and reference numeral 18 denotes baffle plates as air-water separation means that are installed in multiple locations midway within the air-water separation air duct 17 and have inclined surfaces that slope vertically upward. The baffle plates 18 are composed of baffle plate 18a installed in the upper stage within the air-water separation air duct 17, baffle plate 18b installed in the middle stage, and baffle plate 18c installed in the lower stage.
When humidified air flows into the air-water separation duct 17, the humidified air flows in a serpentine manner around each baffle plate 18, causing large-diameter mist in the humidified air to be separated by the inclined surfaces. When the separated large-diameter mist gathers together, it flows under the influence of gravity along the inclined surfaces to the lower end of the baffle plate 18 and falls into the water storage chamber 8. This reduces the amount of large-diameter mist guided to the air outlet 2 and also guides humidified air containing a large amount of fine mist to the air outlet 2.

19 is a heater installed in the water storage chamber 8 to heat the stored water, and is switched ON/OFF as appropriate so that the temperature detected by the water storage temperature sensor 20, which is installed on the outer wall of the water storage chamber 8 and detects the temperature of the stored water, becomes a predetermined temperature.

21 is a water level sensor that is installed in the water storage chamber 8 and detects the water level by the up and down movement of a float. When the water level in the water storage chamber 8 drops below a predetermined water level, it outputs an OFF signal, when the water level rises and exceeds the predetermined water level, it outputs an ON signal, and when the water level rises further and the water storage chamber 8 becomes full, it outputs a full water signal.

22 is a water supply pipe connected to the side of the water storage chamber 8 and supplies water to the water storage chamber 8. In the middle of the water supply pipe 22, there is a water supply valve 23 that opens and closes an electromagnetic valve to control the water supply to the water storage chamber 8, and a pressure reducing valve 24 that reduces the water supply pressure to a predetermined value.

25 is a drain pipe connected to the bottom of the water storage chamber 8 to drain the water in the water storage chamber 8 to the outside of the appliance body 1, and a drain valve 26 is provided midway along the drain pipe 25 as a drain switching means that opens and closes an electromagnetic valve to control the drainage of water from the water storage chamber 8.

27 is a blower temperature sensor installed on the upper wall surface of the blower 2 to detect the temperature of the humidified air blown from the blower 2 toward the room, 28 is an intake air temperature sensor installed near the blower fan 14 to detect the temperature of the room air sucked in from the bottom of the device body 1, and 29 is a humidity sensor installed near the intake air temperature sensor 28 to detect the humidity in the room in which the device body 1 is installed. Based on the temperature and humidity detected by each sensor, the rotation speed of the mist motor 11 and the blower fan 14 is changed, and the ON/OFF state of the heater 19 is switched.

The operation unit 6 includes an operation switch 30 as an operation switching means for instructing the start and stop of the mist operation, a humidification switch 31 that can select from three humidification levels in which the temperature of the water stored in the water storage chamber 8 is changed by switching the ON/OFF state of the heater 19, thereby changing the proportion of the moisture content that can be contained in the humidified air blown into the room from the air outlet 2, and an auto mode that changes the humidification level so that the humidity detected by the humidity sensor 29 becomes a preset humidity, three air volume levels that can be set to the large and small rotation speeds of the mist motor 11 and the blower fan 14, and a humidity sensor 32 that can be set to the small and large rotation speeds of the mist motor 11 and the blower fan 14. The unit is equipped with an air volume switch 32 that can be selected between an automatic mode, which changes the air volume level so that the humidity set by the sensor 29 becomes the preset humidity, a timer changeover switch 33 that sets the start and stop times of the mist operation that supplies humidified air to the room, an air purification switch 34 that operates only the blower fan 14 at the air volume set by the air volume switch 32 to implement an air purification mode that purifies the air in the room, a time setting switch 35 that sets the current time, and a child lock switch 36 that prohibits operations other than stopping operation by operating the switch.

In addition, above each switch on the operation unit 6, there is provided a lamp corresponding to each switch, including an operation lamp 37 that lights up when the operation switch 30 is operated, a sterilization lamp 38 that lights up during sterilization operation that starts after the mist operation has continued for a predetermined time or more, a humidification level lamp 39 that displays the humidification level set by the humidification switch 31 as a number from 1 to 3 and A indicating auto mode, an air volume level lamp 40 that displays the air volume level set by the air volume switch 32 as a number from 1 to 3 and A indicating auto mode, a timer lamp 41 that lights up when the start and stop of the mist operation are set by the timer changeover switch 33, an air purification mode lamp 42 that lights up when the air purification switch 34 is operated and the air purification mode is set, a time display panel 43 that displays the current time set by the time setting switch 35, and a child lock lamp 44 that lights up when the child lock switch 36 is operated.

45 is a control unit composed of a microcomputer that controls the operation and opening and closing of the valves based on the detection values detected by each sensor and the settings of each switch provided on the operation unit 6, and is equipped with a mist motor control means 46 that drives the mist motor 11 at a predetermined rotation speed, a blower fan control means 47 that drives the blower fan 14 at a predetermined rotation speed, and a heater control means 48 that switches the heater 19 ON/OFF to control the water temperature in the water storage chamber 8.

49 is an air intake port formed on the lower front side of the appliance body 1 that draws indoor air into the appliance body 1.

51 is a bypass inlet through which air can flow through a bypass path 50 that penetrates the wall of the air-water separation duct 17, branches off from the air supply path 15, and bypasses the water storage chamber 8. The bypass inlet 51 faces the upwardly inclined surface of the baffle plate 18a installed at the top of the air-water separation duct 17 closest to the air supply outlet 2, and is formed to penetrate the wall of the air-water separation duct 17. By air flowing into the air-water separation duct 17 from the bypass inlet 51, the volume of humidified air rising from the water storage chamber 8 can be increased, and the volume of humidified air blown into the room from the air supply outlet 2 can be increased.

Reference numeral 61 denotes an overflow pipe having one end connected to the wall of the water storage chamber 8. Even if the water level sensor 21 malfunctions and is unable to detect full water, and water supply from the water supply pipe 22 is not stopped, causing the water level in the water storage chamber 8 to rise abnormally, the water in the water storage chamber 8 can be drained through the overflow pipe 61.
A throttle mechanism 62 that reduces the inner diameter of the overflow pipe 61 and narrows the flow path is connected to the other end of the overflow pipe 61. Note that the throttle mechanism 62 in this embodiment has an orifice structure that reduces the inner diameter (constricts the pipe) and then enlarges the inner diameter again (expands the pipe), as shown in Fig. 8 .

63 is a joint such as a T-shaped tee with three-way branches for joining piping. The joint 63 connects the drain pipe 25a in which the drain valve 26 is installed, the overflow pipe 61 in which the throttle mechanism 62 is installed, and the drain pipe 25b for draining water from the drain pipe 25a and the overflow pipe 61 to the outside of the appliance body 1.

64 is a drain pipe connected to drain pipe 25b and made of a hard polyvinyl chloride pipe or flexible piping. Drain pipe 64 leads water from drain pipe 25b to a drain hopper 65 installed outside the appliance body 1 to drain the water. The outlet side of drain pipe 64 is not directly connected to drain hopper 65 because there is a risk of drain backflow if it is directly connected to drain hopper 65, and is used for indirect drainage.

Next, the operation from the start to the end of operation in this embodiment will be described with reference to the flow chart of FIG.
First, when the operation switch 30 of the operating unit 6 is operated or the operation start time set by the timer changeover switch 33 arrives, the control unit 45 opens the drain valve 26 to drain the water in the water storage chamber 8, and when an OFF signal is detected by the water level sensor 21, it opens the water supply valve 23 to perform a cleaning operation to flush the water storage chamber 8 with water, and after a predetermined time has elapsed, it closes the drain valve 26 to supply water flowing in from the water supply valve 23 into the water storage chamber 8, and when an ON signal is detected by the water level sensor 21, it enters a water replacement mode in which the water supply valve 23 is closed, indicating that a predetermined amount of water has been supplied into the water storage chamber 8 (step S101).

When the water replacement mode of step S101 is completed, the control unit 45 performs a start-up mode in which the heater control means 48 turns on the heater 19 until the water temperature detected by the water temperature sensor 20 becomes the same as the room temperature, and the mist motor control means 46 and the blower fan control means 47 control the mist motor 11 and the blower fan 14 to rotate at a predetermined speed (step S102).

When the start-up mode of step S102 is completed, the control unit 45 performs a normal operation mode in which the mist motor 11 and the blower fan 14 are controlled by the mist motor control means 46 and the blower fan control means 47 so that they are driven at a predetermined rotation speed based on the humidification level and air volume level set by the humidification switch 31 and the air volume switch 32, and the heater control means 48 switches and controls the ON/OFF state of the heater 19 to perform a mist operation within a predetermined temperature range according to the humidification level and air volume level (step S103).

If it is determined that the operation switch 30 has been operated during the normal operation mode in step S103 to instruct the operation to end, the control unit 45 stops the mist motor 11, opens the drain valve 26 to drain the water in the water storage chamber 8, and after a predetermined time has elapsed, opens the water supply valve 23 to clean the water storage chamber 8, then closes the drain valve 26 to perform a water replacement operation to store a predetermined amount of water in the water storage chamber 8, then turns on the heater 19 to perform a sterilization operation for a predetermined time to sterilize the water by heating it, and then performs a cooling operation to cool the water storage chamber 8 after the predetermined time has elapsed, and when the temperature of the stored water falls below a predetermined temperature, performs a cleaning mode in which the drain valve 26 is opened to drain the water (step S104).

When the cleaning mode of step S104 is completed, the control unit 45 controls the blower fan 14 to operate at a predetermined rotation speed (e.g., 800 rpm) using the blower fan control means 47, and performs a drying mode in which air is blown into the water storage chamber 8 and the air passage 15 to dry the air and prevent the growth of bacteria (step S105), and determines whether the operation time of the blower fan 14 has counted a predetermined time (e.g., 3 hours), and when 3 hours have been counted, stops the blower fan 14 and ends operation.

Next, the flow paths of dry air and humidified air during mist operation will be explained with reference to Figure 6.

First, when the mist operation is started and the mist motor 11 and the blower fan 14 are driven at a predetermined rotation speed, air from within the room is sucked in through the intake ports 49 on the bottom and front of the device body 1 .
The sucked air then rises up the air blowing path 15 and is divided into air flowing into the water storage chamber inlet 16 and air flowing through the bypass path 50 toward the bypass inlet 51 .

The air flowing into the water storage chamber 8 from the water storage chamber inlet 16 is pumped up by the rotor 10 and crushed by the porous portion 13, and rises up the water-air separation duct 17 as humidified air containing fine mist, large mist, and negative ions. In addition, since the water storage chamber is heated by the heater 19, the humidified air is at a temperature higher than room temperature.
When the air rises up the air-water separation duct 17, the baffle plates 18a, 18b, 18c cause the flow path to meander, and the air flows in a manner that licks the inclined surfaces of each baffle plate 18, causing large-diameter mist in the humidified air to adhere to the surface of each baffle plate 18. When the air reaches the bottom end of each inclined baffle plate 18, the water droplets fall into the water storage chamber 8 due to gravity, thereby reducing the amount of large-diameter mist carried to the air outlet 2.

On the other hand, the air diverted to the bypass passage 50 passes through the bypass passage 50 and then flows into the air-water separation air duct 17 via the bypass inlet 51 .
Then, the humidified air that has risen from the water storage chamber 8 up the air-water separation duct 17 and the air that has been diverted by the bypass path 50 and flowed in from the bypass inlet 51 are mixed in the upper space 52 connected to the downstream end of the air-water separation duct 17.
The humidified air is guided in the direction of the air outlet 2 by a guide plate and a straightening plate (not shown) installed in the upper space 52, and the humidified air containing fine mist and negative ions is supplied into the room.

Next, the effect of preventing whistling noise generated near the outlet of the drain pipe 64 by providing a throttle mechanism 62 that reduces the inner diameter of the overflow pipe 61 will be explained with reference to Figures 7 and 8.

See Figure 7. When the mist motor 11 and the blower fan 14 are driven during mist operation, indoor air is sucked in through the intake port 49, passes through the above-mentioned air passage, and is blown out from the air outlet 2 as humidified air, while air also flows into the overflow pipe 61 connected to the wall surface inside the water storage chamber 8. In other words, after the air that has flowed through the overflow pipe 61 reaches the joint 63, it does not flow into the drain pipe 25a because the drain valve 26 is closed, but on the other hand, the outlet side of the drain pipe 64 (the end on the drain hopper 65 side) is an indirect drain and is open to the outside air, so it flows through the drain pipe 25b and the drain pipe 64 and is sent out to the outside of the device body 1.

At this time, if the drain pipe 64 has a bellows pipe structure like flexible piping and the wind speed of the air flowing through it is high, resonance occurs within the drain pipe 64, and a whistling sound is likely to occur from the outlet side of the drain pipe 64. The whistling sound is a noise generated by a resonance phenomenon caused by the corrugated shape of the flexible piping, and may be unpleasant for users.

As shown in FIG. 8, a throttling mechanism 62 is provided between the overflow pipe 61 and the joint 63, and the inner diameter φd1 of the overflow pipe 61 is reduced to an inner diameter φd2 by the throttling mechanism 62. This reduces the wind speed of the air flowing through the drain pipe 64 due to the pressure loss of the throttling mechanism 62, thereby preventing the generation of a whistling sound at the outlet side of the drain pipe 64. The size of the inner diameter φd2 narrowed by the throttling mechanism 62 is set to a size that ensures a flow rate that can be drained without problems from the overflow pipe 61 even if the water level in the water storage chamber 8 rises abnormally due to a failure of the water level sensor 21, causing an overflow.

Next, the effect of suppressing the growth of biofilms (microorganisms) by placing the throttle mechanism 62 immediately adjacent to the joint 63 will be explained with reference to Figures 7 and 8.

In order to prevent the generation of a whistling sound, it is necessary to reduce the wind speed of the air flowing through the overflow pipe 61 and the drain pipe 64, and therefore a method of reducing the inner diameter using the throttle mechanism 62 has been described. On the other hand, in order to suppress the effects of biofilms that form in the water piping, it is necessary to increase the inner diameter of the piping so that the piping is not clogged by the biofilms, and there is a trade-off between preventing the generation of a whistling sound and suppressing the generation of biofilms.
Here, the throttle mechanism 62 has a throttle point with an inner diameter φd2 that is smaller than the inner diameter φd1 of the overflow pipe 61, making it easier for biofilm to develop in the throttle mechanism 62 than in the overflow pipe 61.

On the other hand, when the operation switch 30 is operated during mist operation to end the operation, the control unit 45 controls the drain valve 26 to open and drain the water in the water storage chamber 8. At this time, the temperature of the stored water is high at about 60°C because it is immediately after the operation has been stopped. The water flows through the drain pipe 25a, the joint 63, the drain pipe 25b, and the drain pipe 64, and then is discharged into the drain hopper 65 for drainage treatment.

Therefore, by placing the throttling mechanism 62, where biofilms are likely to develop, close to the joint 63, the heat generated by the drainage is applied to the throttling mechanism 62 when operation is terminated, and the sterilizing effect of the heat can suppress the development of biofilms on the throttling mechanism 62.

In addition, since the whistling sound can be prevented by narrowing the inner diameter to φd2 using the narrowing mechanism 62, the inner diameter φd1 of the overflow pipe 61 can be increased conversely, thereby suppressing the effects of biofilms that form in the overflow pipe 61.

As described above, by arranging the throttling mechanism 62 in the drainage path of the overflow pipe 61, it is possible to reduce the wind speed of the circulating air while ensuring the drainage flow rate when overflow occurs, and prevent the generation of a whistling sound at the outlet side of the drainage pipe 64. Furthermore, by arranging the throttling mechanism 62 immediately adjacent to the joint 63, it is possible to suppress the generation of biofilm in the throttling mechanism 62 due to the heat associated with draining the water storage chamber 8. In other words, it is possible to simultaneously achieve the prevention of the generation of a whistling sound and the suppression of the generation of biofilm, which are in a trade-off relationship, and to avoid causing discomfort to the user.

In this embodiment, the throttle mechanism 62 has an orifice structure that expands the overflow pipe 61 after shrinking it, but it may have a structure that only shrinks the overflow pipe 61.

In addition, in this embodiment, the humidifier is described as pumping the water in the water storage chamber 8 by rotating the rotor 10, and crushing it in the porous section 13 to generate nano-mist and negative ions, which are then released into the room as humidified air. However, the humidifier may be an evaporative type that releases humidified air into the room by blowing air over a filter that is saturated with water.

In addition, the other configurations used in the present embodiment are presented as examples, and are not intended to limit the scope of the invention, and may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the invention and its equivalents described in the claims.

REFERENCE SIGNS LIST 1: device body 8: water storage chamber 10: rotor 11: mist motor 13: porous portion (impact body)
14 Blower fan 15 Blower path 19 Heater 25 Drain pipe 26 Drain valve 49 Inlet 61 Overflow pipe 62 Throttle mechanism 63 Joint

Claims (2)

a water storage chamber having a water storage chamber inlet through which air in the water storage chamber flows, a blower fan installed in the water storage chamber, the water storage chamber inlet being formed through which air in the water storage chamber flows, the water storage chamber inlet being formed ...
A humidifier characterized in that a throttling mechanism that reduces the inner diameter of the overflow pipe is positioned immediately adjacent to the joint of the overflow pipe , and the control unit opens the drain valve to drain the water in the water storage chamber that has been heated to a predetermined temperature by switching the heating heater ON/OFF . The humidifier according to claim 1, characterized in that the mist generating means is composed of a rotating body that draws up the water in the water storage chamber by rotating and scatters it in an outer circumferential direction, a mist motor connected to a drive shaft that supports the rotating body so that the rotating body can rotate, and a collision body against which the water scattered by the rotating body collides.

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