JP7106397B2 - hot air heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a warm air heating device that heats a room by generating warm air.

Conventionally, as this type of heating device, for example, a heat generating means such as a burner is provided in the main body, and the combustion gas generated by the burner and the indoor air taken into the main body are mixed to generate warm air. It is known to heat the room by blowing out from an outlet provided on the front surface of the main body. The air outlet is provided with blades that can be rotated up and down, and by swinging the blades up and down according to the amount of hot air that is blown out, the temperature distribution in the room is made uniform. , there are those designed to increase the heating effect. Further, the angle of rotation of the blades at this time is controlled so that the greater the amount of combustion in the burner, the greater the angle, and the closer to a substantially horizontal state.

In this way, in a heating device equipped with movable blades, for example, if there is an obstacle in front of the main body and the movement of the blades is restricted, or if the blades do not operate properly due to a failure of the motor that drives the blades, etc. However, there is a problem in that hot air blowout is blocked and the main body and the floor surface are heated. Therefore, the safety of the equipment is ensured by checking whether the blades are operating correctly and stopping the operation when the operation cannot be confirmed.

As a method for checking the operation of the blades, it has been proposed to once rotate the blades to a reference point, for example, a fully open state, and then return them to the original position. It is designed to be detected by detecting means such as a switch (for example, Patent Document 1).

Japanese Patent No. 2890996

By the way, when checking the operation of the blades described above, it is also possible to simultaneously determine whether the detection means (limit switch) is operating normally. Specifically, if the detection means does not detect that the blades are fully opened when the blades return to their original positions, it can be determined that the detection means is operating normally.

However, if the position of the fully opened blade is close to the original position of the blade, the detection means may not detect the full opening even if the blade returns to its original position due to errors in the detection means and variations in the mounting position. can happen. In this case, even though there is no abnormality in the detection means, the error determination occurs frequently and the operation is stopped, which may impair the user's comfort.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot air heating apparatus that avoids unnecessary error determinations due to errors in detection means and that is excellent in safety and comfort.

The present invention provides heat generating means for generating heat;
an outlet for blowing out hot air;
a plurality of rotatable blades provided at the outlet;
a motor for rotating the blades;
a control unit capable of driving the motor to control the operation of the blades and executing a fully open operation to open the blades to a fully open position;
angle detection means for outputting a full-open detection signal when the blade reaches a predetermined angle during execution of the full-open operation, wherein the control unit moves the blade to a target angle after the full-open operation is executed. and determining whether or not the angle detection means outputs a full-open detection signal when the blade reaches the target angle, and the angle detection means outputs the full-open detection signal. the motor is controlled to rotate the blades until the angle detecting means stops outputting the fully open detection signal, and a correction operation is performed using the position of the blades at that time as a base point of the blade rotation operation. It is a warm air heater.

By configuring as described above, unnecessary error determination can be avoided, so that the hot air heating device is excellent in safety and comfort.

2 is an internal configuration diagram of the warm air heating device according to the present embodiment; FIG. 1 is a cross-sectional configuration diagram of a warm air heating device according to the present embodiment; FIG. It is an expanded sectional view of a blower outlet. (A) shows the closed state of the blades, and (B) shows the opened state of the blades. FIG. 4 is a perspective view of a mechanism for driving the blades of the hot air heating device according to the present embodiment; It is a front view of the same mechanism. It is a block diagram showing the configuration of the hot air heating device in the present embodiment. 4 is a flow chart showing an example of control of a full-open operation and a correction operation in this embodiment.

A preferred embodiment of the present invention will now be briefly described to illustrate the operation of the present invention.

The present invention is a hot air heating device that includes a plurality of blades rotated by driving a motor at an air outlet for blowing out hot air, and performs a fully open operation to open the blades to a fully open position during operation. When the angle detection means that outputs a full-open detection signal during execution outputs a full-open detection signal even during non-execution of the full-open operation, a correction operation is performed to change the base point of the rotation operation of the blades. . As a result, even if a full-open detection signal is output while the full-open operation is not being executed, if it is caused by a detection error of the angle detection means or a variation in the mounting position, the base point of the blade rotation operation can be detected. Since it is possible to continue operation by changing, it is possible to avoid unnecessary abnormality judgments such as stopping operation even though there is no abnormality, and it is possible to use the heating system safely and comfortably. .

Also, an upper limit value is set for the motor control amount in the correction operation. The upper limit of the control amount is the angle that is allowed as the error of the angle detection means and the variation in the mounting position. If the angle detection means outputs a fully open detection signal when the motor is driven at the upper limit, it is judged to be abnormal. and stop the operation, it is possible to reliably avoid unnecessary abnormality determinations and use the system safely.

After the full-open operation, the control unit controls the motor to move the blades to the target angle, and determines whether the angle detection means outputs a full-open detection signal when the blades reach the target angle. By limiting the timing for determining whether the angle detection means is operating normally to when the target angle is reached, unnecessary abnormality determination can be more reliably avoided.

In addition, in the movable mode in which the blades are rotated up and down within a set angle range, the lower end angle of the angle range is set as the target angle. As a result, it is possible to prevent the angle detection means from outputting the fully open detection signal when the blade reaches the target angle, and to more reliably avoid unnecessary abnormality determination.

Further, the full-open operation is an operation in which the blades are further opened to the mechanically rotatable upper limit position after the angle detection means outputs the full-open detection signal. This upper limit position is set as the base point of the rotational movement of the blades. As a result, it is possible to correct the angle deviation of the blade without being affected by the error of the angle detection means.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an internal configuration diagram of the warm air heating device, and FIG. 2 is a sectional configuration diagram of the warm air heating device. In this embodiment, a fan heater that performs heating by burning fuel will be described as an example of a warm air heating device.

The main body 1 contains a vaporizer 2 for heating kerosene to form a vaporized gas, a burner 3 as heat generating means for burning the vaporized gas generated by the vaporizer 2 to generate heat, and a burner 3 above the burner 3. A combustion chamber 4 is provided, an oil pan 5 for storing kerosene supplied from a fuel tank (not shown), and an electromagnetic pump 6 placed on the oil pan 5 for pumping kerosene to the carburetor 2 are provided.

An air blower 7 is attached to the back of the main body 1 for taking indoor air into the inside of the main body 1. - 特許庁In addition, on the front of the main body 1, an operation unit 15 provided with a large number of switches for instructing the operation of the heating device, and an air outlet 8 for blowing out hot air are attached. The blades 9 of the

The combustion chamber 4 has an opening 4 a through which combustion exhaust gas generated by the burner 3 is discharged, and a heat shield plate 10 is provided so as to cover the combustion chamber 4 . A hot air passage 11 is formed between the combustion chamber 4 and the heat shield plate 10 to mix combustion exhaust gas and air from the blower 7 to generate hot air.

In the hot-air heating device configured as described above, the combustion exhaust gas generated by the combustion of the burner 3 and the air taken into the main body 1 by the blower 7 are mixed while passing through the hot-air passage 11 to generate hot air. The air is discharged into the room from between the blades 9 of the outlet 8 to heat the room.

3A and 3B are enlarged cross-sectional views of the outlet, FIG. 3A showing a state in which the movable blades are closed, and FIG. 3B a cross-sectional view showing a state in which the movable blades are opened at a predetermined angle. In the warm-air heating device of this embodiment, the outlet 8 has three vertically rotatable movable blades 12 and two fixed, non-rotatable blades arranged between the movable blades 12 and extending in the horizontal direction. It has wings 13 . When the operation is stopped, the movable blades 12 are closed as shown in FIG. 3A, and when the operation is started (combustion in the burner 3 is started), the blade drive motor 23, which will be described later, rotates. By driving the movable blade 12, the movable blade 12 is opened as shown in FIG. 3(B). In the following description, the angle of the movable vane 12 refers to the angle θ in the drawing.

The movable vane 12 can be vertically rotated according to the amount of combustion in the burner 3, and adjusts the blowing angle of the hot air. On the other hand, the fixed blade 13 has a role of guiding forward the hot air that has passed through the hot air passage 11 . When the length of the movable blade 12 in the vertical direction (the length in the vertical direction in FIG. 3A) is long, the gap between the blades is widened, so that the hot air passing through the hot air passage 11 reaches the blades. Although the hot air tends to flow downward from the gap, the hot air can be blown out toward the front of the main body 1 by providing the fixed blade 13, so that the hot air can be efficiently discharged in the intended direction. can. In particular, the fixed blades 13 are more effective when the hot air passage 11 is directed downward and the hot air is blown downward, as in the present embodiment. A structure without the fixed blade 13 may be used.

FIG. 4 is a perspective view of a mechanism for driving the movable vanes, and FIG. 5 is a front view of the same mechanism. A blowout port 8 having movable blades 12 is attached to the main body 1 with a support fitting 20 .

The supporting bracket 20 includes a linking cam 22 connected to the movable blade 12 via a rotating shaft 21, a blade driving motor 23 for driving the movable blade 12, and a driving cam connected to the blade driving motor 23. 24 and an angle detection means 25 for detecting the angle of the movable blade 12 are attached, and a guide hole 26 for guiding the rotation of the linking cam 22 around the rotation shaft 21 is provided.

The link cam 22 has two pins (a first pin 221 and a second pin 222). The first pin 221 is connected to the rotating shaft 21 described above, and the second pin 222 is connected to the drive plate 27 which is provided slidably with respect to the support fitting 20 . A drive shaft 241 extending from the drive cam 24 is engaged with the drive plate 27, and one end of a spring member 28 attached to the tip of the drive shaft 241 is attached. A shielding piece 29 corresponding to the angle detection means 25, which will be described later, is provided below the driving plate 27. As shown in FIG.

The blade drive motor 23 is composed of a stepping motor capable of forward and reverse rotation, and its rotation is controlled based on instructions from a control section 30, which will be described later. When the driving cam 24 rotates due to the rotation of the blade driving motor 23 , the driving plate 27 moves up and down. That is, when the drive plate 27 moves downward, the linking cam 22 rotates in the direction of the arrow A, and the movable blade 12 rotates upward. Conversely, when the drive plate 27 moves upward, the linking cam 22 rotates in the direction of arrow B, and the movable blade 12 rotates downward. The angle detection means 25 detects that the movable blade 12 has rotated upward and reached a predetermined angle.

The angle detection means 25 is composed of, for example, a photointerrupter having a light emitting section 251 and a light receiving section 252 arranged to face the light emitting section 251 . When the blade drive motor 23 is rotated to rotate the movable blade 12 upward, the drive plate 27 moves downward. Then, when the angle of the movable blade 12 reaches a predetermined angle, the shielding piece 29 enters between the light emitting portion 251 and the light receiving portion 252 to block the light from the light emitting portion 251 . That is, when the light receiving section 252 cannot detect light, it is determined that the movable blade 12 has reached the predetermined angle. The configuration of the angle detection means 25 is not limited to this, and other detection methods may be used.

FIG. 6 is a block diagram showing the configuration of the warm air heating device. A control unit 30 made up of a microcomputer includes temperature detection means 16 for detecting the indoor temperature, various setting means (for example, room temperature setting means 17 for setting the temperature, operation mode setting means for setting the operation mode) provided in the operation unit 15. Input is received from means 18 ) and angle detection means 25 for detecting the angle of the movable blade 12 . Then, it outputs control signals to the heater 14 for heating the evaporator 2, the electromagnetic pump 6, the air blower 7, and the blade drive motor 23, thereby controlling the heating operation.

The control unit 30 also includes a combustion amount control means 31 for calculating and determining the combustion amount in the burner 3, a blower control means 32 for controlling the rotation of the blower 7, and a blade drive motor control for controlling the rotation of the blade drive motor 23. Means 33 , and abnormality determination means 34 for determining abnormality of parts related to rotation of the movable vane 12 such as the blade drive motor 23 and the angle detection means 25 . It should be noted that the configuration of the drawing is an example of the warm air heating device according to the present embodiment, and may include other components than those illustrated.

In the heating device configured as described above, when the start of operation is instructed, first, energization to the heater 14 is started to heat the vaporizer 2 . When the vaporizer 2 reaches a temperature at which the liquid fuel can be vaporized, the electromagnetic pump 6 is driven to supply the liquid fuel to the vaporizer 2, and the liquid fuel supplied to the vaporizer 2 is heated and vaporized to form a vaporized gas. becomes. Vaporized gas is supplied from the tip of the vaporizer 2 to the burner 3 and burned in the burner 3 . Combustion exhaust gas generated by combustion is mixed with air from the blower 7 to form warm air, which is then discharged from the blowout port 8 .

Moreover, the warm air heating device of this embodiment is provided with a plurality of switchable operation modes, and the operation mode is selected by operating the operation mode setting means 18 of the operation unit 15 . This operation mode has a movable mode in which the movable blades 12 are vertically rotated within a preset angle range, and a fixed mode in which the movable blades 12 are fixed at a preset angle. In either mode, the angle of the movable vane 12 is set according to the amount of combustion determined by the amount of combustion control means 31 . The blade drive motor control means 33 controls the drive steps of the blade drive motor 23 according to the set angle.

For example, when the amount of combustion is large, the movable blade 12 repeats vertical movement between 70 and 80 degrees in the movable mode, and is fixed at 75 degrees in the fixed mode. Further, when the amount of combustion is small, the movable blade 12 repeats vertical movement between 60 and 75 degrees in the movable mode, and is fixed at 65 degrees in the fixed mode. For medium firepower, the angle is set between large and small firepower. In addition, the above-mentioned angle is an example, and can be set appropriately. Also, the operation mode may be only the movable mode.

The movable vane 12 is set so that the angle is larger when the amount of combustion is large than when the amount of combustion is small, regardless of the operation mode. In other words, when the amount of combustion is large, the hot air blowing angle is increased to carry the warm air farther, and the opening area is increased to effectively prevent heat from being trapped inside the main body 1. can be done. In addition, when the amount of combustion is small, the feet can be warmed by directing the blow-out opening downward, thereby increasing the heating efficiency.

Further, during the heating operation, a full-open operation is performed to open the movable blades 12 to the full-open position. This full-open operation can be performed at predetermined time intervals. The fully open position here means a position where the movable blade 12 is opened to an angle equal to or greater than the maximum angle during normal operation. Since the maximum angle of the blades 12 is set to 80 degrees (the maximum angle in the movable mode), the fully open position should be a position where the angle of the movable blades 12 is 80 degrees or more. This full-open operation can be performed in either the movable mode or the fixed mode.

When the movable blade 12 reaches a predetermined first angle (for example, 80 degrees) after executing the fully open operation, the angle detection means 25 detects this and outputs a fully open detection signal to the controller 30 . In this embodiment, the angle detection means 25 is composed of a photointerrupter, and the full-open detection signal is a signal generated when the light-receiving section 252 no longer detects the light emitted by the light-emitting section 251 . By receiving this fully open detection signal, the abnormality determination means 34 determines that the movable blade 12 is operating correctly.

If the movement of the movable blades 12 is restricted due to an obstacle on the front surface of the main body 1 or if the movable blades 12 do not operate at the set angle due to a failure of the blade drive motor 23 or the like, hot air blowing is hindered. As a result, a problem arises that the temperature inside the main body 1 rises abnormally. Therefore, during operation, the fully open operation is performed to check whether the movable blades 12 are operating correctly, and when the operation cannot be confirmed, the operation is stopped. This allows safe use of the heating device.

Further, in the movable mode, an error occurs between the actual angle of the movable blade 12 and the control signal output from the blade drive motor control means 33 by repeating the operation of rotating the movable blade 12 up and down. In addition, it is conceivable that the user changes the angle of the movable vane 12 by hand or the like, causing a deviation from the actual angle. Therefore, by executing the fully open operation during the heating operation regardless of the operation of the movable vanes 12, the fully open position can be used as the base point of the rotation operation of the movable vanes 12, and the error in the angle of the movable vanes 12 can be corrected. For example, the movable blade 12 that has been manipulated can be returned to the correct position.

In the fully open operation of this embodiment, after the angle detecting means 25 detects that the movable blades 12 have reached the first angle, the blade drive motor 23 is further rotated to reach the upper limit at which the movable blades 12 can be mechanically rotated. It is designed to open to the position. For example, when the first angle is 80 degrees, the angle of the movable blade 12 at the upper limit position is 85 degrees, and this upper limit position corresponds to the fully open position. Rotating motion of the movable blades 12 in each operation mode is executed by controlling the drive step of the blade drive motor 23 with the fully open position (85 degrees) as a base point. By controlling the blade driving motor 23 so as to open the movable blade 12 to the upper limit position in this way, the mechanical upper limit position is set as the base point of the rotation operation of the movable blade 12, and thereby the angle detection means 25 detects the angle. Even if there is an error in the angle, the angle of the movable blade 12 can be corrected without being affected by the error.

When the fully open operation is finished, the movable blade 12 returns to the operation in the selected operation mode. When the movable blade 12 rotates downward and the angle becomes smaller than the first angle, the output of the fully open detection signal from the angle detection means 25 stops. If a full-open detection signal is output from the angle detection means 25 while the full-open operation is not being executed, there is a possibility that an abnormality has occurred in the blade drive motor 23 or the angle detection means 25. . The abnormality determination means 34 determines whether or not there is an abnormality in the parts related to the rotation of the movable blade 12, and stops the operation when it is determined that there is an abnormality.

However, due to a detection error of the angle detection means 25 and variations in the mounting position, the angle detection means 25 may output a fully open detection signal even when the movable blade 12 has returned to the operation mode. In particular, at the time of combustion with high thermal power, the angle of the movable blade 12 is close to the fully open position, so such a situation is likely to occur. will stop. Therefore, in order to avoid such an unnecessary abnormality determination, when the angle detection means 25 outputs the full-open detection signal while the full-open operation is not being performed, the base point of the rotating operation of the movable blade 12 is corrected. Take corrective action.

In the correcting operation, the blade drive motor 23 is rotated so as to further rotate the movable blade 12 downward in order to confirm the position where the angle detection means 25 does not detect the full opening. When the movable vane 12 rotates and the output of the fully open detection signal from the angle detection means 25 stops, the control unit 30 stores the position of the movable vane 12 at that time, and uses this position to rotate the movable vane 12. Set a new base point for movement. After that, with this position as a base point, the rotation operation of the movable blade 12 is executed by controlling the drive step of the blade drive motor 23 .

In this embodiment, the angle detection means 25 is set to output a fully open detection signal when the angle of the movable blade 12 reaches the first angle (80 degrees). When the full-open operation is finished and the operating mode operation is restored, that is, when the full-open detection signal is output even though the angle of the movable blade is 80 degrees or less, the correcting operation is performed. In the correction operation, if the movable blade 12 is rotated further downward and the output of the fully open detection signal is stopped when the movable blade 12 reaches the position of 70 degrees, for example, the position at this time (the actual angle is 70 degrees) is changed to 80 degrees. It is corrected and stored each time, and the drive step of the blade drive motor 23 is controlled as the base point of the rotational movement of the movable blade 12 . By executing the correcting operation in this way, it is possible to correct the base point of the rotating operation of the movable blade 12 and continue the operation. Abnormal determination is avoided.

In the correction operation, an upper limit value can be set for the control amount of the blade drive motor 23, and an angle that is allowed as an error of the angle detection means 25 or a variation in mounting position is set as the upper limit value of the control amount. When the blade drive motor 23 is composed of a stepping motor as in the present embodiment, an upper limit is set for the number of driving steps of the motor. Even if the correction operation is started and the blade drive motor 23 is rotated to the upper limit of the number of steps, if the angle detection means 25 continues to output the fully open detection signal, it is determined that an abnormality has occurred. to stop operation.

Further, the control unit 30 controls the drive step of the blade drive motor 23 so as to move the movable blade 12 toward the target angle when the fully open operation is completed. Whether or not to execute the correction operation can be determined by confirming whether or not a fully open detection signal is output from the angle detection means 25 when the movable blade 12 reaches this target angle. In this way, by limiting the timing of determination to when the movable blade 12 reaches the target angle, unnecessary abnormality determination can be effectively avoided.

The above-mentioned target angle is the angle of the movable blade 12 that is set according to the amount of combustion in each operation mode. In the movable mode, since the movable blade 12 has a rotation angle range set, the target angle is preferably the lower end angle of that angle range. In the above example, when the amount of combustion is large, the target angle is 75 degrees in the fixed mode and 70 degrees, which is the lower end of the angle range, in the movable mode. In the movable mode, setting the target angle to the lower end angle increases the difference from the first angle. Therefore, when the movable blade 12 reaches the target angle, the angle detection means 25 outputs a fully open detection signal. It can be suppressed.

FIG. 7 is a flow chart showing an example of control of the full-open operation and correction operation. The full-open operation is performed at predetermined intervals, and it is determined whether or not a predetermined time has passed since the previous full-open operation (step 1), and when it is detected that the predetermined time has passed, the full-open operation is started. (Step 2).

When the fully open operation is started, the blade drive motor 23 is rotated so that the movable blade 12 reaches the fully open position (step 3), and it is determined whether the movable blade 12 has reached the first angle based on the detection result of the angle detection means 25 (step 3). step 4). If it is detected that the movable vane 12 has reached the first angle (Yes in step 4), it can be determined that the movable vane 12 is operating correctly, and from here the movable vane 12 is further mechanically driven. The blade drive motor 23 is rotated until it reaches the maximum possible position (step 5). When the movable vane 12 reaches the upper limit position, the fully open operation is finished (step 6). After the fully open operation is completed, the blade drive motor is rotated so that the movable blade 12 reaches the target angle with the fully open position as the base point (step 7).

The target angle here is an angle that is set according to the amount of combustion in each operation mode. If so, it is determined whether a fully open detection signal is output from the angle detection means 25 (step 9). Here, if the fully open detection signal is not output from the angle detection means 25 (No in step 9), it can be determined that the angle detection means 25 and the blade drive motor 23 are operating normally. While performing the heating operation in the selected operation mode, it waits for the next full-open operation instruction.

On the other hand, when the fully open detection signal is output from the angle detection means 25 (Yes in step 9), correction operation is started (step 10). When the correction operation is started, the rotation of the blade drive motor 23 is added by one step to rotate the movable blade 12 further downward (step 11), and it is determined whether the output of the fully open detection signal has stopped (step 12). ).

When the output of the fully open detection signal continues (No in step 12), it is determined whether the number of additional steps of the blade drive motor 23 has reached the upper limit (step 13). , and the rotation of the blade drive motor 23 is added by one step. If the number of additional steps of the blade drive motor 23 has reached the upper limit (Yes in step 13), it is determined that the angle detection means 25 or the blade drive motor 23 is abnormal, and the operation is stopped.

When it is detected in step 12 that the output of the fully open detection signal has stopped (determination is Yes), the position of the movable blade 12 at this time is stored, set as the base point of the rotation operation (step 14), and corrected. The operation ends (step 15). After completing the correction operation, the process returns to step 1 and waits for the next instruction of the full-open operation while performing the heating operation in the selected operation mode. During that time, the pivoting motion of the movable vane 12 is controlled based on the base point set in step 14 .

As described above, the heating device of the present embodiment corrects the base point of the rotation operation of the movable vanes 12 when the angle detection means 25 outputs the full-open detection signal while the full-open operation is not being performed. Therefore, when the fully open detection signal is generated due to the detection error of the angle detection means 25 or the variation in the mounting position, the operation can be continued by changing the base point of the rotation operation of the movable blade 12. can. As a result, it is possible to avoid the unnecessary abnormality determination that the operation is stopped even though there is no abnormality, so that the heating device can be used safely and comfortably.

3 burner (heat generating means)
8 air outlet 12 movable blade (blade)
23 motor (blade drive motor)
25 angle detection means 30 control unit

Claims (4)

a heat generating means for generating heat;
an outlet for blowing out hot air;
a plurality of rotatable blades provided at the outlet;
a motor for rotating the blades;
a control unit capable of driving the motor to control the operation of the blades and executing a fully open operation to open the blades to a fully open position;
angle detection means for outputting a full-open detection signal when the blade reaches a predetermined angle during execution of the full-open operation, wherein the control unit moves the blade to a target angle after the full-open operation is executed. and determining whether or not the angle detection means outputs a full-open detection signal when the blade reaches the target angle, and the angle detection means outputs the full-open detection signal. the motor is controlled to rotate the blades until the angle detecting means stops outputting the fully open detection signal, and a correction operation is performed using the position of the blades at that time as a base point of the blade rotation operation. Warm air heater. The control unit sets an upper limit value to the amount of control of the motor in the correcting operation, and detects an abnormality when the angle detecting means outputs a fully open detection signal when the motor is driven at the upper limit value. 2. The warm air heater according to claim 1, wherein the operation is stopped after making a decision. 3. The warm air heating according to claim 2 , wherein the operation mode includes a movable mode in which the blades are rotated vertically within a set angle range, and the target angle in the movable mode is the lower end angle of the angle range. Device. The full-open operation is an operation in which the blade is further opened to a mechanically rotatable upper limit position after the angle detection means outputs a full-open detection signal,
If the angle detecting means does not output a fully open detection signal when the blade reaches the target angle after execution of the fully open operation, the control unit regards the upper limit position as a base point of the blade rotating operation. The warm air heating device according to any one of claims 1 to 3 .

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