JP3622780B2 - Electric heating equipment with humidifier - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric heater equipped with a humidifier.
[0002]
[Prior art]
The electric heating equipment provided with the conventional humidification apparatus is demonstrated using FIGS. 7-9. FIG. 7 is a schematic perspective view showing an example of a conventional electric heating device. As shown in the figure, this electric heating device has a hot air outlet 102 at the lower front portion of the apparatus main body 101. The room is heated by blowing warm air from the warm air outlet 102. An operation unit 103 is provided on the upper surface of the apparatus main body 101. FIG. 8 is a schematic diagram illustrating an example of the operation unit 103. As shown in the figure, the operation unit 103 includes a power switch 106, a manual operation switch 107, an automatic operation switch 108, a steam switch 109, an on timer switch 110, a turn-off timer switch 111, a manual operation mode lamp 112, and an automatic operation mode lamp. 113, a digital display unit 114, an on timer lamp 115, an off timer lamp 116, and a water supply lamp 117.
[0003]
Further, a lid 105 having an opening 104 is provided on the upper surface of the apparatus main body 101. The apparatus main body 101 corresponding to the lower part of the lid 105 is provided with a humidifying device section that generates steam, and the steam generated in the humidifying apparatus section is discharged from the opening 104 to the outside of the apparatus main body 101 to be humidified indoors. I do. 9 is a cross-sectional view taken along the line XX ′ of FIG. In this example, a water storage tank 118 for storing water is provided in the apparatus main body 101, and a hollow pipe 119 formed of a copper tube is vertically attached to the side of the water storage tank 118. A conducting tube portion 120 is provided at the bottom of the water storage tank 118 and is connected to the lower end of the hollow pipe 119 by a connection tube 121 formed of silicon rubber.
[0004]
A steam outlet 122 is connected to the upper end of the hollow pipe 119 by a connection tube 123. The lid 105 has an opening 104 at a position facing the steam outlet 122. Here, the fluororesin 124 is applied to the surface of both ends of the hollow pipe 119, that is, the surface of the connection portion between the connection tube 121 and the connection tube 123. Thereby, corrosion of the hollow pipe 119 can be prevented. In addition, a tubular heating portion 126 is formed by winding a heating element 125 at a substantially central portion of the hollow pipe 119.
[0005]
The operation of the electric heating apparatus having the above configuration will be described. First, when the power is turned on by pressing the power switch 106 of the operation unit 103, the heater and the blower fan of the heating unit are driven and the hot air blows out from the hot air outlet 102. Thereby, indoor heating can be performed. Next, the heating operation mode is selected by the manual operation switch 107 or the automatic operation switch 108 in the heating operation mode. Here, as the heating operation mode, four modes of “strong, medium, weak, and weak” can be selected for manual operation, and three modes of “high, standard, and low” can be selected for automatic operation. Note that which of the above heating operation modes is selected can be grasped by the lighting state of the manual operation mode lamp 112 or the automatic operation mode lamp 113.
[0006]
Next, a case where the humidifying operation is performed will be described. First, the lid 105 is opened and water is injected from the steam outlet 122 to supply water into the water storage tank 118 through the hollow pipe 119 and the conducting pipe portion 120. The supplied water passes through the conducting pipe 120 from the bottom of the water storage tank 118 and fills the lower part of the hollow pipe 119. In this state, the power switch 106 of the operation unit 103 is pressed to turn on the power, and the heating operation described above is started. In this state, the steam switch 109 is further pressed to energize the heating element 125 of the tubular heating unit 126, thereby heating and evaporating the water in the hollow pipe 119. Then, the generated steam is discharged from the opening 104 through the steam outlet 122 to the outside of the apparatus main body 101, that is, the room where the electric heating device is installed, and humidifies the room. Thus, the humidification operation is performed together with the heating operation, and the operation of the humidification operation alone is not performed.
[0007]
[Problems to be solved by the invention]
The electric heating equipment having the conventional configuration described above can select two modes of the manual operation mode and the automatic operation mode as the heating operation mode. However, none of the operation modes is provided with a function for stopping the heating operation. For this reason, it is possible to select only a single operation of the heating device or a combined operation of the heating device and the humidifying device, and the humidifying device cannot be operated alone. This is because the steam generation capacity of the humidifying unit provided in the conventional electric heating device is small (several tens of ml), and the main function is focused on indoor heating. However, when installing a full-fledged humidifier unit with a steam generation capacity of several hundred ml in an electric heating device, if the humidifier unit cannot be operated alone, the original function cannot be fully achieved and it is inconvenient. It becomes a product.
[0008]
An object of the present invention is to provide an electric heating device that is capable of operating the humidifying device alone in the electric heating device including the humidifying device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an electric heating device according to the present invention is an electric heating device having a heating device unit that heats a room and a humidifying device unit that humidifies the room, and operates the humidifying device unit alone. Selection means is provided. In addition, in order to operate the said humidifier part independently, the heating operation stop mode is provided in the heating mode selection switch provided in the operation part. Moreover, you may provide the mechanism which stops heating operation by pressing down the humidification mode selection switch provided in the operation part for a fixed time.
[0010]
Furthermore, when both the heating operation and the humidification operation are stopped, a mechanism is provided to turn off the power lamp provided in the operation unit and turn off the power. In particular, a mechanism may be used in which the power lamp provided in the operation unit is turned off and the power is turned off after a certain time has elapsed since both the heating operation and the humidification operation are stopped. In addition, when the humidifier unit is operated independently, there is provided means for increasing the humidification amount as compared with the combined operation with the heating unit.
[0011]
Specifically, a heating unit that heats the room, a humidifying unit that humidifies the room, an operation unit including a power switch, a heating mode selection switch, and a humidification mode selection switch, and an input from the operation unit In the electric heater having the control unit for changing the operation mode of the heating device unit and the humidifying device unit, both the heating device unit and the humidifying device unit can be operated by the power switch, and the heating mode selection switch The heating unit can be stopped, and the humidifying unit can be stopped by the humidification mode selection switch. Moreover, in order to stop a heating apparatus part by continuing pressing the said humidification mode selection switch for a fixed time, the timer measurement means which measures the time which the said humidification mode selection switch is pressed is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
About the electric heating apparatus which concerns on this invention, the structure of an apparatus is first demonstrated using FIGS. 1-4. FIG. 1 is a schematic perspective view showing an example of an electric heating device according to the present invention. In this embodiment, the warm air outlet 2 is provided in the lower front part of the apparatus main body 1. The room is heated by blowing warm air from the warm air outlet 2. An operation unit 3 is provided on the upper surface of the apparatus main body 1. FIG. 2 is a schematic diagram illustrating an example of the operation unit 3. As shown in the figure, the operation unit 3 includes a power switch 8, a heating mode selection switch 9, a humidification mode selection switch 10, an on timer switch 11, an off timer switch 12, a power lamp 13, a heating mode lamp 14, and a humidification mode lamp. 15, a digital display unit 16, an on timer lamp 17, an off timer lamp 18, and a water supply lamp 19.
[0013]
A vapor outlet 6 having a lid 4 and an opening 5 is provided on the upper surface of the apparatus main body 1. A humidifier unit that generates steam is provided inside the apparatus main body 1 that is below the lid 4, and the steam generated in the humidifier unit is discharged from the opening 5 to the outside of the apparatus main body 1 to be humidified indoors. I do. 3 is a cross-sectional view taken along the line XX ′ of FIG. In this example, a water storage tank 20 is provided below the lid 4. The water storage tank 20 has a tank cap 21 and is a detachable cartridge type. When water is supplied, the lid 4 is opened to take out the water storage tank 20, and the tank cap 21 is opened to pour water. Conversely, when installing the water storage tank 20 into the apparatus main body 1, the water storage tank 20 is installed on the water receiving member 22 with the tank cap 21 facing downward.
[0014]
Here, since the tank cap 21 is provided with the valve mechanism 23, it is possible to supply water while the water level inside the humidifying unit is always kept constant. A water level confirmation window 7 is provided on the front surface of the apparatus main body 1 at a position facing the water storage tank 20. This water level confirmation window 7 is formed of a transparent board, and the water storage tank 20 is also a translucent plastic tank, so that the amount of remaining water can be visually confirmed from the outside. Thereby, the complicated operation | work which takes out the water storage tank 20 whenever confirmation of the amount of remaining water becomes unnecessary.
[0015]
On the other hand, a hollow pipe 24 formed of a copper pipe is vertically attached to the side of the water storage tank 20. The water receiving member 22 and the hollow pipe 24 communicate with each other through an auxiliary tank 25. That is, one of the auxiliary tanks 25 is connected to the lower end of the water receiving member 22 and the other is connected to the lower end of the hollow pipe 24. For this connection, connection tubes 26 and 27 made of silicon rubber are used. Further, the auxiliary tank 25 is provided with a drain port 28 for discharging unnecessary water to the outside of the apparatus main body 1.
[0016]
The upper end of the hollow pipe 24 is connected to the lower end of the mixing tank 30 through a connection tube 29. The upper end of the mixing tank 30 is connected to a connection member 32 via a connection tube 31. This connecting member 32 is a member for attaching and detaching the steam outlet 6 by fitting. Thus, if it is set as the structure which can remove the steam blower outlet 6, since the inside of the said mixing tank 30 etc. can be cleaned easily, clean steam can always be obtained. Here, the fluororesin 33 is applied to the surface of both ends of the hollow pipe 24, that is, the surface of the connection portion between the connection tube 27 and the connection tube 29. Further, a tubular heating part 35 is formed by winding a heating element 34 around the hollow pipe 24. In this embodiment, since this tubular heating part 35 is further covered with the heat insulating cover 36, the added heat can be used for heating the water without waste, which is very efficient. Therefore, the power consumption can be reduced, which is very economical.
[0017]
Next, the function of the mixing tank 30 will be described with reference to FIG. 4 is a cross-sectional view taken along line YY ′ of FIG. As shown in the figure, the mixing tank 30 communicates with the blower 38 through the air intake 37. By setting it as such a structure, the vapor | steam which generate | occur | produced in the said tubular heating part 35 and the air sent from the said air blower 38 can be mixed, and the temperature of a vapor | steam can be lowered | hung. Thereby, even when the steam directly hits the user, there is no risk of the user being burned, and the room can be humidified safely.
[0018]
The operation of the electric heater having the above configuration will be described with reference to FIG. FIG. 5 is a block diagram showing a schematic configuration of the electric heating equipment according to the present invention. As shown in this figure, input signals from the power switch 8, the heating mode selection switch 9, and the humidification mode selection switch 10 are sent to the microcomputer 40 through the switch circuit 39. The microcomputer 40 includes a control unit 41 and a timer measurement unit 42. The control unit 41 processes the input signal from the switch circuit 39 and outputs the result to the display circuit 43 and the drive circuit 44.
Thereby, the display circuit 43 changes the lighting state of the power lamp 13, the heating mode lamp 14, and the humidification mode lamp 15, and the drive circuit 44 controls the operation of the heating unit 45 and the humidifying unit 46. In addition to the input signal from the switch circuit 39, the control unit 41 is not only about the time during which each switch is pressed and the indoor environment data obtained by the temperature sensor 47 and the humidity sensor 48 measured by the timer measuring means 42. Processing is performed, and the result is output to the display circuit 43 and the drive circuit 44, thereby controlling the entire electric heating device.
[0019]
Here, the starting of the electric heating apparatus according to the present embodiment will be described. When the power switch 8 provided in the operation unit is pressed when the power supply of the electric heating device is in the “off” state, the power lamp 13 is turned on and the power supply is in the “on” state. Then, both the heating device 45 and the humidifying device 46 are started, and the heating operation and the humidifying operation are started. Hereinafter, each operation will be described in detail in the order of heating operation, humidification operation, and timer setting.
[0020]
First, the case where a heating operation is performed will be described. When the power is turned on by pressing the power switch 8 of the operation unit 3, the heater and the blower fan of the heating device unit 45 are driven and hot air blows out from the hot air outlet 2. Thereby, indoor heating can be performed. Next, the heating operation mode is selected by the heating mode selection switch 9 of the operation unit 3. The heating operation mode in the initial state immediately after turning on the power is “standard” mode, and every time the heating operation mode selection switch 9 is pressed, “standard” → “higher” → “(heating operation) stop” → “silent” → It circulates in the order of “Low” → “Standard”.
[0021]
Here, the target room temperature is different for each of the three modes “higher, normal, lower”. Specifically, “higher” is 24 ° C., “standard” is 22 ° C., and “lower” is 18 ° C. as a target room temperature, and two heaters for heating (in this embodiment, 600 W are provided). ) And the heating fan. On the other hand, in the “silent” mode, only one heater of 600 W among the heaters is continuously operated. Thereby, in the situation where quietness is required, such as when the user is sleeping, the driving sound of the heating device can be suppressed as much as possible. In addition, it can be grasped by the lighting state of the heating mode lamp 14 provided in the said operation part 3 which of the above heating operation modes is selected.
[0022]
Further, in the electric heating device according to the present embodiment, the “stop” mode is provided in the heating operation mode. Thus, the heating operation can be stopped while the main power supply is in the “on” state. That is, only the humidifier unit 46 can be operated independently. When the heating operation mode is the “stop” mode, the heating mode lamp 14 is turned off.
[0023]
Next, a case where the humidifying operation is performed will be described. First, water is supplied to the water storage tank 20 in advance according to the procedure described above. The supplied water passes through the auxiliary tank 25 from the bottom of the water storage tank 20 and fills the lower part of the hollow pipe 24. In this state, when the power switch 8 of the operation unit 3 is pressed to turn on the power, the heating element 34 of the humidifying unit 46 generates heat, and the water in the hollow pipe 24 is heated to 90 to 95 ° C. Can do. Then, after the temperature of the generated steam is adjusted to an appropriate temperature in the mixing tank 30, the steam is discharged from the opening 5 through the steam outlet 6 to the outside of the apparatus body 1, that is, the room where the electric heating device is installed, and humidifies the room. be able to.
[0024]
The humidification operation mode in the initial state immediately after turning on the power is “50” mode, and every time the humidification operation mode selection switch 10 is pressed, “50” → “60” → “(humidification operation) stop” → “continuous” → It circulates in the order of “40” → “50”. Here, each humidification operation mode is demonstrated. For the three modes “40, 50, 60”, the target indoor humidity is different. Specifically, “40” is 40%, “50” is 50%, and “60” is 60% as the target indoor humidity, and the heating element 34 and the blower 38 are controlled. On the other hand, the “continuous” mode literally operates the humidifier unit 46 continuously.
[0025]
Further, by providing the “stop” mode in the humidifying operation mode, it is possible to operate only the heating device unit 45 alone. In addition, it can be grasped by the lighting state of the humidification mode lamp | ramp 15 provided in the said operation part which of the above humidification operation modes is selected. When the humidifying operation mode is the “stop” mode, the humidifying mode lamp 15 is turned off.
[0026]
In the present embodiment, the humidification mode selection switch 10 not only selects the humidification operation mode, but also stops another heating function when another function, that is, the humidification mode selection switch 10 is continuously pressed for a certain time (for example, 1 second). It has the function of being able to. This is because the timer measurement means 42 in the microcomputer 40 counts the time during which the humidification mode selection switch 10 is kept pressed, and when the control unit 41 determines that “one second or longer”, the drive circuit 44 Command to stop the heating operation. This function obtains the same result as when the “stop” mode of the heating operation mode is selected.
[0027]
Here, in order to select the “stop” mode with the heating mode selection switch 9, it is necessary to perform a switch operation four times at the maximum (when the “stop” mode is selected from the “silent” mode). On the other hand, if the heating operation mode is set to the “stop” mode by pressing the humidification mode selection switch 10 for one second, the heating operation can be stopped with a single touch of the switch. This makes it possible to smoothly operate only the humidifying device section 46 without performing complicated switch operations. In addition, when the humidifier unit 46 is operated alone, an embodiment including means for increasing the amount of humidification as compared with the combined operation with the heating unit 45 can be employed.
[0028]
FIG. 6 is a circuit diagram of the electric heating device according to the present embodiment. In this embodiment, a humidification increase switch 49 is provided. When the humidification increase switch 49 is pressed, a command to turn on the relay coil 74 is sent from the microcomputer 40. As a result, in addition to the humidifying main heater 50, the humidification sub-heater 51 is energized, the heating capacity is increased, and the humidification capability is improved. In FIG. 6, reference numeral 60 denotes a commercial AC power source, and 45 a and 45 b denote first and second heaters constituting the heating device unit 45, respectively. Reference numeral 61 denotes a step-down transformer whose output is rectified by a full-wave rectifier circuit 62 and smoothed by a smoothing circuit 63. As a result, a DC voltage of 5V is obtained on the line L1. Line L2 is a ground voltage line.
[0029]
One end of each of the switches 9, 10, 49 is commonly connected to a terminal 67 of the microcomputer 40, and the other end of each of the switches 9, 10, 49 is connected to the micro through a collector base of a PNP type transistor 64, 65, 66. It is connected to terminals 68, 69 and 70 of the computer 40. The emitters of the transistors 64, 65 and 66 are connected to a 5V DC power supply line L1. Reference numerals 71, 72, 73 and 74 are relay coils driven by the microcomputer 40, and reference numerals 81, 82, 83 and 84 are relay switches corresponding to these relay coils. The switches 9, 10, and 49 are switches that are turned on while being pressed and turned off when the hands are released.
[0030]
Now, when the heating mode is selected with the switch 9, the "strong-medium-weak-OFF" operation is performed according to the difference between the set temperature of the mode and the room temperature, and during the "strong" operation, the microcomputer 40 It is detected that the terminals 67 and 68 are connected, and based on this, a current is passed through the relay coils 71 and 72. For this reason, the relay switches 81 and 82 are turned ON, and the first heater 45a and the second heater 45b are energized. When the set temperature of the heating mode approaches, the operation becomes “weak”, and the relay switch 82 is turned off and only the relay switch 81 is turned on by a command from the microcomputer 40. Therefore, only the first heater 45a is energized. Thus, the operation state of the heating device unit 45 changes depending on the heating mode selection of the switch 9. When the switch 9 is “stopped (heating operation)”, the relay switches 81 and 82 are both turned off, and the energization of the first and second heaters 45a and 45b is stopped.
[0031]
When the switch 10 is turned on, a current flows through the relay coil 73, the relay switch 83 is turned on, and the humidifying main heater 50 is energized. The humidifying mode is selected by the switch 10, and the relay switch 83 is turned on / off according to the difference between the humidity in the setting mode and the room humidity, and the humidifying main heater 50 is controlled. Similarly, when the switch 49 is turned ON, the relay switch 84 can be turned ON / OFF via the relay coil 74, whereby the humidification sub-heater 51 is turned ON / OFF to control the humidification sub-heater 51.
[0032]
As described above, in the electric heating apparatus according to the present embodiment, not only the heating device unit 45 and the humidifying device unit 46 are operated in combination, but either one can be operated alone. Here, when the heating operation is stopped and the humidification mode selection switch 10 sets the humidification operation mode to the “stop” mode, that is, when both the heating operation and the humidification operation are stopped, the power lamp If means for turning off the power 13 and turning the power off is provided, it is convenient that the power switch 8 does not need to be turned off.
[0033]
In this case, the power may be turned off after a certain time (for example, 10 seconds) has elapsed since both the heating operation and the humidifying operation are stopped. Accordingly, when the humidifying mode selection switch 10 is operated in a state where the heating operation is stopped, even if the “stop” mode is selected, if the mode is changed to a different mode within 10 seconds, the power is erroneously changed to the “off” state. Never become. In addition, the function demonstrated above is applicable also when operating the heating mode selection switch 9 further in the state which the humidification driving | operation has stopped.
[0034]
Next, a case where timer setting is performed will be described. First, an on timer setting in which the power is turned on after a specified time will be described. When the on-timer switch 11 provided on the operation unit 3 is kept pressed for 1 second, “7” is digitally displayed on the digital display unit 16 and the on-timer lamp 17 starts blinking. This “7” means that the power is turned on after 7 hours. Each time the on-timer switch 11 is pressed in this state, the digital display circulates as “7 → 8 → 9 → no display (timer setting release) → 1 → 2 →... → 6 → 7”. After setting the desired time by this operation, if the non-operation state is set for 8 seconds, the on-timer lamp 17 changes from blinking to lighting and the setting of the on-timer is completed. The number on the digital display section 16 decreases with the passage of time. When the desired time is reached, the power is turned on, and the heating operation and the humidifying operation are started.
[0035]
Next, a description will be given of how to set the power-off timer to turn off the power after a specified time. When the off timer switch 12 provided in the operation unit 3 is continuously pressed for 1 second, “1” is digitally displayed on the digital display unit 16 and the off timer lamp 18 starts blinking. This “1” means that the power is turned off after one hour. Each time the off timer switch 12 is pressed in this state, the digital display circulates as “1 → 2 →... → 8 → 9 → no display (timer setting release) → 1”. After setting the desired time by this operation, if the non-operation state is set for 8 seconds, the off timer lamp 18 changes from blinking to lighting, and the setting of the off timer is completed. The number on the digital display unit 16 decreases with the passage of time. When the desired time is reached, the power is turned off and the heating operation and the humidifying operation are stopped.
[0036]
As described above, the on-timer switch 11 or the off-timer switch 12 is designed so that the timer cannot be set unless it is kept pressed for 1 second. Thereby, when the user accidentally presses the timer switch, the timer setting is not performed, so that it is possible to prevent malfunction of the electric heating device.
[0037]
【The invention's effect】
According to the present invention, in the electric heating device that performs the heating operation and the humidifying operation, the humidification can be operated independently, so that the use is expanded compared with the conventional electric heating device that does not have this function, and the value of the electric heating device is increased. It has the effect of increasing. For example, the heating device unit and the humidifying device unit are both started by pressing the power switch, and then the heating device unit is stopped by the heating mode selection switch, thereby obtaining the single operation state of the humidifying device unit. Can do. As described above, by providing the heating operation stop mode in the heating mode selection switch provided in the operation unit, the electric heating device is very easy to use and can perform the humidifying operation alone.
[0038]
In addition, if a mechanism for stopping the heating operation by pressing the humidification mode selection switch for a certain period of time, that is, a timer measurement means for measuring the time during which the humidification mode selection switch is pressed, is provided, the heating operation can be performed with a single touch of the switch. Can be stopped. Thereby, it becomes possible to perform a humidification operation | movement smoothly smoothly, without performing complicated switch operation.
[0039]
Further, there is provided a mechanism for turning off the power lamp and turning off the power when both the heating operation and the humidifying operation are stopped. This is convenient because it is not necessary to turn off the power with the power switch. In particular, a mechanism may be adopted in which the power lamp is turned off after a certain time has elapsed since both the heating operation and the humidification operation are stopped, and the power is turned off. Thus, even if one of the “stop” modes is selected while one operation is stopped, the power is not erroneously turned off if the mode is changed to a different mode within a certain time.
[0040]
In addition, when the humidifier unit is operated independently, there is provided means for increasing the humidification amount as compared with the combined operation with the heating unit. Thereby, the performance of the humidifier can be fully demonstrated, and the room can be humidified effectively.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an example of an electric heating device according to the present invention.
FIG. 2 is a schematic diagram illustrating an example of an operation unit provided in the electric heating apparatus according to the present invention.
3 is a cross-sectional view taken along the line XX ′ of FIG.
4 is a cross-sectional view taken along the line YY ′ of FIG. 1;
FIG. 5 is a block diagram showing a schematic configuration of an electric heating device according to the present invention.
FIG. 6 is a circuit diagram of an electric heating device according to the present invention.
FIG. 7 is a schematic perspective view showing an example of a conventional electric heating device.
FIG. 8 is a schematic diagram illustrating an example of an operation unit provided in a conventional electric heating device.
9 is a cross-sectional view taken along the line XX ′ of FIG.
[Explanation of symbols]
1 Main unit
2 Hot air outlet
3 Operation part
4 Lid
5 openings
6 Steam outlet
7 Water level confirmation window
8 Power switch
9 Heating mode selection switch
10 Humidification mode selection switch
11 On timer switch
12 off timer switch
13 Power lamp
14 Heating mode lamp
15 Humidification mode lamp
16 Digital display
17 On timer lamp
18 OFF timer lamp

Claims (2)

A heating unit that performs indoor heating, a humidifying unit that humidifies the room, an operation unit that includes a power switch, a heating mode selection switch, and a humidification mode selection switch, and the heating unit that receives an input from the operation unit And an electric heating device having a control unit that changes an operation mode of the humidifying device unit ,
An electric heating apparatus comprising a mechanism for stopping a heating operation by continuously pressing a humidification mode selection switch provided in the operation unit for a predetermined time . The electric heating device according to claim 1, further comprising means for increasing the amount of humidification when the humidifier unit is operated alone compared to when the humidifier unit is used together with the heater unit .

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