JP6720621B2 - Hot air heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a warm air heater for releasing air heated by combustion heat of a burner as warm air. In particular, the present invention relates to a warm air heater equipped with a proportional valve for adjusting the fuel amount in order to enhance safety.

A proportional valve with a closing function is known as a proportional valve for adjusting the gas supply amount (for example, a pressure proportional valve that biases a closed state by spring pressure). Such a proportional valve with a closing function has an advantage that safety can be improved, but on the other hand, there is a concern that the valve may be stuck in the closed state, and therefore countermeasure control is required. In Patent Document 1 below, in a hot-air heater that employs a proportional valve with a closing function, as a countermeasure control, when the power is turned on (when the power plug is inserted into a power outlet), the proportional valve is in a closed state. It is described that a large current including the maximum current is supplied to operate the valve so that the valve can be released even if it is stuck (see paragraphs 0016 and 0020 of the same document). Then, thereafter, it is described that, when the operation switch is turned on, control is performed to supply a normal current required for combustion operation to the proportional valve to adjust to a predetermined opening degree. (See paragraph 0017 of the same document).

Further, Patent Document 2 below describes that an ion generating unit having an ion generating function is attached to a warm air heater. That is, an ion generation unit equipped with an ion generation unit and a fan for ion emission is built in a warm air heater, and ions are generated by discharge from the electrode section toward the air taken in from the installation space of the warm air heater. Then, the air containing the ions is discharged to the installation space. The ion discharging operation by the ion generating unit and the warm air heating operation are separately and independently executed by the user operation.

Patent No. 3837799 JP2012-132635A

By the way, it is conceivable that the above-mentioned countermeasure control is performed every time when the combustion operation is performed, other than when the power is turned on, to ensure reliability. However, at the same time as the above-described countermeasure control for the proportional valve, current is supplied to another load (for example, a fan) for warm air heating operation, or a load for additional function operation related to an additional function other than the warm air heating function (for example, ion) If the current supply to the generating unit overlaps, there is a possibility that the power supply capacity of the power supply unit may be insufficient. Therefore, if the power supply capacity is increased, the power supply unit becomes large. On the other hand, when the operation switch is turned on, the countermeasure control is independently executed in advance and then the control for the combustion operation (for example, driving of the fan) is started, so that the time required for the countermeasure control is required. When it is turned on, the immediate warmth that the heating is immediately obtained by blowing hot air is impaired.

The present invention has been made in view of the above circumstances, and an object thereof is to employ a proportional valve and implement countermeasure control for avoiding a stuck state by increasing the size of a power supply unit. (EN) Provided is a hot-air heater capable of performing a combustion operation without inducing heat, impairing immediate warmth, or impairing an additional function.

In order to achieve the above-mentioned object, a warm air heating load for performing warm air heating operation by combustion operation in the combustion section and an additional function load for performing additional function operation related to additional functions other than warm air heating. Then, the following technical measures were taken for the hot air heater including the control unit for controlling these operations.

In other words, you and further comprising a common power supply unit for supplying drive power to both the hot air heating load and the additional function for the load. Further, the hot air heating load is provided with a hot air fan and an adjustment valve whose opening degree is controlled to be adjustable so as to adjust the amount of fuel supplied to the combustion section. Their to, as the control unit, when said receiving the operation start instruction of the warm-air heating operation, when said additional function operation is running, load the additional function for performing the operation that additional functions When switching to a predetermined limit state in which the supply of drive power to the is limited, the drive power for performing the warm air heating operation is supplied to the warm air heating load, and when the combustion unit shifts to a combustion operation state. a structure to release the state in which the restriction.

By such a specific matter , when the warm air heating operation is started during the additional function operation, the supply of the drive power to the additional function load is restricted to a predetermined restricted state, so that the common power supply unit It is possible to avoid the risk of a power supply capacity excess problem. That is, if the same supply of drive power as before is continued and the additional function operation is continued as it is, in addition to the supply of drive power from the common power supply unit to the additional function load, further warm air heating is performed. Since the supply of drive power to the work load is newly added, it is conceivable that the power supply capacity of the common power supply unit may be exceeded. When the power supply capacity is increased as a countermeasure, not only the power supply circuit becomes larger, but also the cost increases. On the other hand, as in the present invention, by limiting the supply of the drive power to the load for the additional function only for a short period until the combustion unit starts the combustion operation, it is possible to avoid the possibility of exceeding the power supply capacity. .. As a result, even if the warm air heating operation is started during the additional function operation, the user can enjoy both the additional function and the warm air heating function without increasing the power supply capacity. It
In addition, the control unit performs a pre-purge operation by supplying drive power from the power supply unit to the hot air fan before the combustion operation in the combustion unit as the warm air heating operation, while the pre-purge operation is performed. During the operation period, the adjustment is performed by supplying driving power from the power supply unit to the adjusting valve for a predetermined period of time by energizing a large current larger than the current required for adjustment for changing the opening for normal combustion control. The valve is temporarily opened, and the period from the pre-purge operation to before the ignition detection in the combustion section, at least during the period for temporarily opening the adjustment valve, The configuration is such that the supply of drive power to the load for additional functions is switched to a restricted state (claim 1). By providing such a specific matter, in the present invention, even if a malfunction such as sticking occurs on the valve closing side in the adjustment valve, it is possible to cancel the sticking or other problems by the forced valve opening operation. Become. Since such a valve opening operation is performed each time the combustion operation is performed, the combustion operation of the combustion section can be ensured, and the valve opening operation of the regulating valve is performed by driving the hot air fan. The time required from the heating operation command to the start of the warm air heating operation due to the combustion operation of the combustion section can be shortened compared to the case where it is performed separately before the start, and immediate warming is not deteriorated. .. In addition, the supply of drive power to the additional function load was limited during the period from the pre-purge operation to the detection of ignition in the combustion section, at least during the period for temporarily opening the adjustment valve. Since the configuration is switched to the state, the period during which the additional function operation is temporarily limited can be minimized.

Further, in the warm air heater of the present invention, the supply of drive power to the load for additional function may be limited and the supply of drive power may be temporarily stopped (claim 2). By doing so, the supply of drive power to the additional function load is cut off, and it is possible to reliably avoid the possibility of a problem of power source capacity excess.

In the warm air heater of the present invention, an ion generator can be included as a load for additional functions (claim 3). By doing so, the ions generated by the ion generator are contained in the air as a load function, which can contribute to purification of the atmosphere.

Further, in the warm air heater of the present invention, as an additional function operation, the air containing the ions generated by the ion generator can be discharged to the outside of the machine by driving the ion fan (claim 4). ). By doing so, it is possible to further expect the atmosphere purification by the air containing ions.

As described above, according to the warm air heater of the present invention, when the warm air heating operation is started during the additional function operation, the predetermined limitation state in which the supply of the drive power to the additional function load is limited. Since it is switched to, it is possible to avoid the possibility of a problem that the power supply capacity of the common power supply unit is exceeded. That is, if the same drive power supply as before is continued and the additional function operation is continued as it is, it is conceivable that the common power supply unit may exceed the power supply capacity. If the capacity is increased, not only the size of the power supply circuit is increased but also the cost is increased. On the other hand, as in the present invention, by limiting the supply of the drive power to the additional function load for a short period until the combustion unit starts the combustion operation, it is possible to avoid the possibility of exceeding the power supply capacity. As a result, even if the warm air heating operation is started during the additional function operation, the user can enjoy both the additional function and the warm air heating function without increasing the power supply capacity. ..

The example of the warm air heater of embodiment is shown, FIG.1(a) is the perspective view seen from the front, and FIG.1(b) is the perspective view seen from the back. It is a schematic diagram which shows the warm air heater of FIG. 1 in principle. It is a time chart for explaining current supply control to a fan, a proportional valve, and an ion generating unit that are supplied with current from a common 22V power supply.

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

FIG. 1 shows the external appearance of a combustion type hot air heater according to an embodiment of the present invention. The warm air heater of the present embodiment takes in the air in the room which is the installation space, heats the taken in air by combustion heat, and adds the warmed air to the room as hot air to blow the air into the room, As an additional function, it has an ion emission function of emitting air containing ions to the installation space.

As shown in FIG. 1A, the warm air heater includes a substantially box-shaped exterior case 1 having a bottom wall, a front wall, a side wall, a top wall, a back wall, and the like. An operation unit 2 including an operation switch 21 for warm air heating operation and a display unit 3 are provided on the top wall of the outer case 1, and a temperature control panel 41 for adjusting the wind direction is provided on the lower portion of the front wall. The wind blowing port 4 is formed. An air intake port 5 (see FIG. 1B) is formed on the back wall of the outer case 1. Inside the outer case 1, there are arranged a combustion case 8 having a combustion unit 6 and a blower unit 7 built therein, an ion generating unit 9 for purifying the atmosphere of the warm air heater installation space, and a control unit 10. It is set up.

As shown in FIG. 2, the combustion unit 6 can be configured to include a burner 61 and a gas supply passage 62 for supplying gas as fuel. The burner 61 is provided with an ignition device 63 and a flame detector 64. The ignition device 63 can be configured by, for example, a spark plug, and the flame detector 64 can be configured by, for example, a thermocouple that detects heat of the flame. Further, the gas supply passage 62 is provided with an original gas electromagnetic valve 65 for switching between gas supply and cutoff by switching between opening and closing at an upstream position, and serves as a control valve for adjusting the gas supply flow rate by adjusting the opening degree. A proportional valve 66 is installed at the downstream side position. The proportional valve 66 is configured with a closing function that can be converted into a fully closed state. As the proportional valve 66 having such a closing function, for example, a repulsive magnetic force type pressure proportional valve can be used. The source gas electromagnetic valve 65 and the proportional valve 66 perform a valve opening operation when a drive signal (drive power) is supplied from the control unit 10, while a valve closing operation is performed when the drive signal is not supplied. That is, even if the original gas electromagnetic valve 65 and the proportional valve 66 are both closed and the original gas electromagnetic valve 65 is opened to supply gas to the proportional valve 66 side, the proportional valve 66 is closed. Therefore, the gas supply to the burner 61 side is kept cut off, and double safety is secured in this respect. Then, when the gas is introduced into the burner 61 from the nozzle at the downstream end of the gas supply passage 62, the air taken in from the air intake port 5 is taken in to mix it with a predetermined air-fuel ratio, and this air-fuel mixture is burned. It will be burned at 61.

The blower unit 7 includes a fan (warm air fan) 71, and the fan 71 includes a fan motor 72 for rotationally driving the fan 71. The fan 71 has a function of blowing the air taken in from the indoor space where the warm air heater is installed into hot air to blow out the air, and can be configured by a cross flow fan. By using the cross flow fan, warm air can be blown out from the warm air outlet 7 with a relatively wide and uniform wind velocity distribution. The fan motor 72 can be configured by a DC motor, and the rotation speed can be adjusted by receiving a drive signal (drive power) from the control unit 10.

The combustion case 8 has a double-shell structure on at least a part or all of the upper surface and the front surface. The combustion unit 6 is provided in an inner shell 81 that defines a combustion chamber, and an air supply passage 83 is defined between the upper shell side and the front shell side of the inner shell 81 and the outer shell 82. A space is defined below the inner shell 81 so as to communicate with the downstream end of the air supply passage 83, and the air blowing unit 7 is installed so as to face the warm air outlet 4 in this space. .. As a result, the air taken in from the air intake port 5 into the inner shell 81 and heated by the combustion heat of the combustion unit 7 and the air bypassing the combustion chamber and taken in from the air intake port 5 are supplied to the air supply path. In the state of being mixed in 83, the air can be fed toward the blower unit 7.

The ion generation unit 9 realizes an ion generation function, and includes a main body case 91, an ion emission fan 92 and an ion generator 93 installed in the main body case 91. In the main body case 91, the air intake port 94 (see also FIG. 1B) of the main body case 91 is exposed on the rear wall of the outer case 1, and the blowout port 95 is exposed on the top surface wall of the outer case 1. It is installed in. The ion generator 93 can be configured to generate ions by, for example, discharging the electrode portion. Then, the ion generating unit 9 drives the fan motor 92a to drive the air (ion-containing air) containing the ions generated by the ion generator 93 by turning on the operation switch 22 for the ion discharging operation of the operation unit 2. Thus, the ion discharge operation of discharging into the room through the outlet 95 is executed under the control of the control unit 10.

When the plug 101 is plugged into a power outlet (not shown) and the power is turned on, the control unit 10 receives an operation signal from the operation unit 2 such as the operation switches 21 and 22, and receives an ignition device serving as a warm air heating load. 63, the original gas solenoid valve 65, the proportional valve 66 and the fan motor 72, and the operation control of various loads such as the fan motor 92a and the ion generator 93 which are loads for the ion emission function. For such operation control, the control unit 10 can be configured to include a control unit 102, a drive circuit 103, and a power supply circuit 104. The control unit 102 is configured to include a microcomputer and sends various control signals for controlling the operation of the various loads to the drive circuit 103. The drive circuit 103 includes various drive circuit units corresponding to the various loads described above. For example, a drive signal (drive power) is output from the source gas solenoid valve drive circuit unit to the source gas solenoid valve 65 based on a control signal from the control unit 102. In particular, with respect to the proportional valve 66, the sticking that eliminates the possibility that the proportional valve 66 is stuck in the closed valve state at a predetermined timing (for example, during the pre-purge described later) before the combustion operation with the ON operation of the operation switch 21. Countermeasure control for cancellation is executed. That is, based on a control signal from the control unit 102, the proportional valve driving circuit unit of the driving circuit 103 supplies a proportional large amount of current to the proportional valve 66 (for example, a current larger than a normal supply current required for opening adjustment, A countermeasure (hereinafter, referred to as "kicking operation") is executed in which the valve 66 is forcibly opened by supplying a current including a maximum current that can be applied to the valve 66 for a predetermined time (for example, 1 second).

Further, the fan motor 72 is rotationally driven by the supply of a drive signal (driving power) from the warm air fan motor drive circuit section of the drive circuit 103. The fan motor drive circuit unit controls the rotational drive of the fan motor 72 so as to reach the target rotation speed instructed by the control signal from the control unit 102. That is, the fan motor 72 is provided with a rotation speed detection sensor (not shown), and the control unit 102 controls the fan motor 72 so that the rotation speed of the fan motor 72 becomes the target rotation speed based on the input rotation speed detection signal. A control signal is feedback-controlled to the motor drive circuit section.

The power supply circuit 104 is a switching power supply circuit that inputs AC power from a commercial power system and outputs DC power of a predetermined voltage, and can be configured by including an insulating AC/DC converter. The power supply circuit 104 supplies operating power to the control unit 102, and also supplies circuit operating power and drive power to various components to the drive circuit 103. At that time, it is possible to supply drive power according to the drive circuit unit for each of the various types of loads forming the drive circuit 103. For example, in the present embodiment, driving power is supplied from the same 22V power supply line to the proportional valve 66 and the fan motor 72 of the warm air heating load, and the fan motor 92a and the ion generator 93 of the ion emission function load. The main gas electromagnetic valve 65 is supplied with drive power from the 15V power supply line, and the ignition device 63 is supplied with drive power from the 100V power supply line. That is, drive power is supplied to the proportional valve 66, the fan motor 72, the fan motor 92a, and the ion generator 93 from the 22V power supply line that is a common power supply unit. The power supply capacity can be determined, for example, based on the current value required for each rated operation of the fan motor 72 and the proportional valve 66.

Next, the warm air heating operation control, the ion emission operation control and the operation thereof when the operation switches 21 and 22 are turned on by the user will be described with reference to FIG. Here, the warm air heating operation control based on the ON operation of the operation switch 21 and the ion ejection operation control based on the ON operation of the operation switch 22 are separately and independently executed according to the intention of the user. Therefore, the warm air heating operation may be turned on only when necessary, and may be turned off in other cases, while the ion ejection operation may be kept on and may be constantly in continuous operation. Hereinafter, the case where the warm air heating operation is switched from OFF to ON while the ion discharging operation is in continuous operation, that is, the case where the ion discharging operation and the warm air heating operation simultaneously overlap will be described.

When the operation switch 21 (see FIG. 2) is turned ON from the standby state of the warm air heating operation OFF, the control unit 102 receives the ON operation signal (warm air heating operation command) and executes the electric circuit resistance check P1. Then, the pre-purge operation P2 (including the kicking operation P3) and the ignition operations P4, P5 and P6 are performed, and then the combustion operation P7 is executed. Then, when the operation switch 21 is turned OFF, the OFF operation signal is received to stop the combustion, the post-purge operation P8 is executed, and then the operation returns to the standby state. On the other hand, when the control unit 102 receives the ON operation signal from the operation switch 21 for the warm air heating operation, the control unit 102 suspends the supply of the drive power for the ion ejection operation as described later. In the standby state, both the original gas solenoid valve 65 and the proportional valve 66 are closed, and the fan motor 72 is also stopped. The pre-purge operation is a process for improving the stability of combustion at the start of combustion by discharging combustible gas in the combustion chamber before the start of combustion. This is a process for discharging gas.

As the pre-purge operation of the present embodiment, first, the fan starting operation P2 is executed to start the fan motor 72 from the stopped state to raise it to a predetermined number of revolutions, and then the kicking operation during the operation period in the raising process. Execute P3. In the fan start-up P2, the control unit 102 outputs a control signal to the fan motor drive circuit unit of the drive circuit 103 based on the rotation speed detection signal so that the fan motor 72 becomes equal to or higher than the predetermined rotation speed to drive the fan motor. Driving power based on the control signal is supplied from the circuit section to the fan motor 72.

In the kicking operation P3, based on a control signal from the control unit 102, the proportional valve 66 is driven by supplying a predetermined large current (first current) from the proportional valve drive circuit unit of the drive circuit 103 to release the fixation. Electric power is supplied for a predetermined time (for example, about 1 second). By supplying this drive power, the proportional valve 66 can be forcibly opened even if the valve body is stuck in the valve closed position. As the predetermined large current (first current) to be energized for the kicking operation P3, the opening degree of the proportional valve 66 is changed and adjusted in order to adjust the gas supply flow rate range necessary for the normal combustion control of the burner 64. Therefore, it is possible to make the current value larger than the necessary current value and less than or equal to the maximum current value at which the proportional valve 66 can be energized. In order to ensure reliability, a larger current is preferable, and the maximum current value can also be adopted. The kicking operation P3 causes the proportional valve 66 to temporarily open, so that the residual combustible gas in the gas supply passage 62 between the proportional valve 66 and the original gas electromagnetic valve 65 can be purged. The effect can also be obtained.

After the kicking operation P3 is completed, the control unit 102 causes the rotation speed of the fan motor 72 to be higher than the required rotation speed required for the ignition operation (for example, [slow ignition rotation speed-100 rpm] in the control unit 102). Number), that is, if it is determined that the ignition condition is satisfied, the ignition operations P4, P5, P6 are started. First, as IGON (igniter ON operation) P4, energization to the ignition device 63 is controlled based on a control signal (ignition signal) from the control unit 102, and spark ignition is discharged from the ignition device 63 based on this. This is continued until flame detection by the flame detector 64 is performed, that is, until ignition detection (confirmation of ignition). On the other hand, following the igniter ON operation P4, the original gas solenoid valve 65 is opened, and then the drive circuit 103 opens the proportional valve 66 to a predetermined opening degree for starting combustion based on a control signal from the control unit 102. The drive power is supplied by current flow in the current value range necessary for adjustment. The predetermined opening degree of the proportional valve 66 is controlled according to, for example, a target combustion heat amount (target combustion amount) set according to a difference between a room temperature detected by an atmosphere temperature sensor in the installation space and a set temperature. , The opening of the normal combustion control range. Then, the combustion operation P7 is started by the ignition detection, that is, the ignition of the burner 61, and the current value supplied to the fan motor 72 is adjusted to be increased according to the combustion amount, and the rotation speed is also increased.

Next, the ion ejection operation control when the warm air heating operation is turned on from the standby state of OFF will be described. The control unit 102 operates in conjunction with the start of the warm air heating operation, more precisely, the start of the fan starting operation P2. , The supply of drive power to the ion generating unit 9 which has been continuing until then is temporarily stopped. That is, based on the control signal for the temporary stop from the control unit 102, the drive power is supplied from the ion fan motor drive circuit unit of the drive circuit 103 to the fan motor 92a and the ion generator drive circuit of the drive circuit 103 is supplied. The supply of drive power from the unit to the ion generator 93 is temporarily stopped. Then, this temporary stop is continued at the end of the ignition operations P4, P5, P6, that is, until the ignition detection, and the supply of drive power to the fan motor 92a and the ion generator 93 is restarted by the ignition detection. After that, the warm air heating operation and the ion discharge operation are continued. Although the ion emission is stopped during the temporary stop period, the stop time is short (for example, 5 seconds), and thus the operation display (for example, the text display "Ion emission operation is in progress" or the operation is performed on the display unit 3 is performed. It is possible to continue without interrupting the lighting of the display lamp indicating the inside). This is because there is no harmful effect even if the operation display is continued, and conversely, if the operation display is temporarily stopped (interrupted), there is a possibility that the user may be unnecessarily confused as to whether or not there is a failure.

In the case of the above embodiment, if the warm air heating operation is started during the ion discharging operation and the ion discharging operation is continued as it is, the ion generating unit 9 (fan motor 92a and ion generator 93) is supplied from the same 22V power supply line. ) Is continuously supplied (see the chain double-dashed line T1 in FIG. 3), and the supply of drive power to the fan motor 72 and the proportional valve 66 is newly added, the power supply capacity of the 22V power supply line ( 3 (see the alternate long and short dash line P in FIG. 3) may occur (see the state indicated by the alternate long and two short dashes line T2 in FIG. 3). On the other hand, if a measure to increase the power supply capacity is adopted, not only will the power supply circuit become larger, but also the cost will increase. On the other hand, as in the present embodiment, by limiting the ion ejection operation only for a short period in which the power supply capacity may be exceeded, it is possible to avoid the power supply capacity excess. As a result, even if the warm air heating operation is started during the ion discharge operation, the user can enjoy both the warm air heating function and the ion discharge function without increasing the power supply capacity. Like

On the other hand, in the present embodiment, the kicking operation is not executed once for the proportional valve 66 when the power is turned on, but the kicking operation is executed at the start of the combustion operation. During the prepurge operation, the kicking operation P3 of the proportional valve 66 is simultaneously performed. Therefore, even if the proportional valve 66 should fall into the stuck state, the kicking operation for releasing the stuck state can be performed at the start of the combustion operation, and the proportional valve 66 can surely open the valve. After that, it becomes possible to reliably perform the combustion operation every time. In addition, as a kicking operation for the proportional valve 66 is separately performed before the pre-purge operation, for example, a new kicking operation requires time, and as a result, there is a problem that immediate warmth is adversely affected. On the other hand, in the present embodiment, it is possible to avoid such a defect occurrence and maintain the immediate warming property.

<Other Embodiments>
It should be noted that the present invention is not limited to the above-described embodiment, but includes various other embodiments. That is, the supply of the drive power to the ion generating unit 9 is temporarily stopped from the start of the warm air heating operation (start of the prepurge start operation P2) to the ignition detection, but it is not completely stopped (the supply of the drive power is cut off). In addition, the supply of drive power can be temporarily restricted. That is, it is possible to supply drive power by energizing the fan fan motor 92a for ions and the ion generator 93 with a current value that is a predetermined amount smaller than that during steady operation. That is, it is possible to temporarily limit the supply of the driving power such that the ion generation unit 9 is continuously energized with a current having a current value that is suppressed to a level that does not exceed the power supply capacity. Further, since it is intended not to fall into excess of the power source capacity, only one of the fan motor 92a and the ion generator 93 which is the load of the ion generating unit 9, for example, only the ion generator 93 is targeted. The drive power supply can be controlled to be temporarily limited or temporarily stopped.

Further, in the above-described embodiment, the period from the start of the pre-purge operation P2 to the ignition detection is set as the period in which the supply of the driving power to the ion generating unit 9 is temporarily limited or temporarily stopped. Since the purpose is not to fall, at least during the kicking operation P3 where the possibility of exceeding the power supply capacity is the highest, or when the kicking operation P3 is started and the proportional valve opening operation P6 of the ignition operations is started immediately after the start. It can be a period until the current converges and stabilizes in the steady current state. This is because there is a strong possibility that the power supply capacity will be exceeded at least during the kicking operation P3, and at the same time, the power supply capacity will be temporarily exceeded immediately after the proportional valve opening operation P6 is started.

In the above-described embodiment, the ion discharge function is used as the additional function, the ion generator is used as the load for the additional function, and the ion discharge operation is used as the additional function operation. However, instead of or in addition to this, for example, a humidification function is used. Can be adopted as an additional function. In this case, the load function load can be a humidifier and the additional function operation can be a humidification function operation.

In the above embodiment, the case where the proportional valve 66 with a closing function is used as the adjusting valve has been shown, but the present invention is not limited to this, and an adjusting valve having no closing function can be used. Even in this case, by executing the kick-off operation P3 as in the above-described embodiment, it is possible to eliminate the problem that the adjusting valve remains stuck at a specific opening. In this case, a high degree of safety can be ensured by using a combination of the original gas electromagnetic valve 65 and another valve having a closing function.

In the above embodiment, the kicking-out operation P3 is executed every time the warm air heating operation is started, but the present invention is not limited to this, and the execution of the hot air heating operation this time is, for example, the end of the previous warm air heating operation. Only when a predetermined time or more has elapsed from the time point, the kicking action P3 can be executed. By doing so, when the warm air heating operation is started during the load function operation (for example, the ion discharge operation), the drive power for the additional function load is reduced only when the kicking operation P3 is executed. It can be configured to temporarily limit the supply (including suspension). In this case, if the execution of the hot air heating operation of this time has been less than the predetermined time since the end of the previous hot air heating operation, the execution of the kicking operation P3 is stopped and the warm air heating operation is performed as an additional function operation. Run at the same time.

7 fan (hot air fan; hot air heating load)
9 Ion generation unit (load for additional functions)
61 burner (burning section)
63 Ignition device (hot air heating load)
66 Proportional valve (regulation valve; hot air heating load)
92 fan (Ion fan; additional function load)
93 Ion generator (load for additional functions)
102 control unit 104 power supply circuit (power supply unit)

Claims (4)

Warm air heating load for performing warm air heating operation by combustion operation in the combustion section, additional function load for performing additional function operation related to additional functions other than warm air heating, and controlling these operations In a warm air heater equipped with a control unit for
Bei example a common power supply unit for supplying drive power to both the hot air heating load and the additional function for the load,
As the hot air heating load, an adjustment valve whose opening degree is controlled to be adjustable so as to adjust the amount of fuel supplied to the combustion unit, and a hot air fan are provided,
Before Symbol control unit,
When the additional function operation is being executed when the operation start command for the warm air heating operation is received, a predetermined value that limits the supply of drive power to the additional function load for executing the additional function operation is performed. In addition to switching to the restricted state, the drive power for executing the warm air heating operation is supplied to the warm air heating load, and the limited state is released when the combustion unit shifts to the combustion operation state. Composed ,
In addition, the control unit performs a pre-purge operation by supplying drive power from the power supply unit to the hot air fan before the combustion operation in the combustion unit as the warm air heating operation, while the pre-purge operation is performed. During the operation period, the adjustment is performed by simultaneously supplying the drive power from the power supply unit to the adjustment valve for a predetermined time by supplying a large current larger than the current required for the adjustment for changing the opening for normal combustion control. The valve is temporarily opened, and the period from the pre-purge operation to before the ignition detection in the combustion section, at least during the period for temporarily opening the adjustment valve, A warm air heater configured so as to switch to a state in which drive power supply to an additional function load is limited . The warm air heater according to claim 1,
The state in which the supply of the drive power to the additional function load is limited is a temporary stop of the supply of the drive power. The warm air heater according to claim 1 or 2,
The hot air heater in which the load for additional functions includes an ion generator. The warm air heater according to claim 3,
In the additional function operation, the air containing the ions generated by the ion generator is discharged to the outside of the machine by driving an ion fan.

Images