JP6233628B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater that heats a room. The present invention particularly relates to a warm air heating device having an “eco-operation function”.

There is known a hot air heating device with a structure in which a burner and a blower fan are built in the housing, a flame is generated by the burner, and the generated combustion gas is diluted with the air supplied by the blower fan and released to the outside of the housing Yes.
Many hot air heaters have a target temperature input switch for setting and inputting a temperature desired by a user. Many hot air heaters are provided with an indoor temperature sensor for detecting the indoor temperature and a control device. Then, the combustion amount of the burner and the blowing amount of the blower fan are controlled so that the room temperature detected by the indoor temperature sensor coincides with the target temperature set by the target temperature input switch.

For example, if the user desires 18 ° C. and the target temperature input switch sets 18 ° C., and the detected temperature of the indoor temperature sensor is 10 ° C. at that time, the burner and the blower fan are fully It is operated at capacity (100 percent output) and attempts to bring the room temperature closer to 18 ° C.
If the hot air heater uses on / off control, the burner combustion stops when the room temperature reaches the target temperature. If the hot air heater uses proportional control, the burner is continuously burned with the combustion amount reduced, and the room temperature is maintained at 18 ° C.

As a general rule, the hot air heating system controls the burner combustion amount and the blower fan air flow rate with the temperature desired by the user as the target temperature, but the room temperature is the target temperature set and input by the user. And a function of correcting the target temperature downward on the condition that the operation of the warm air heating device has continued and a considerable time has passed (Patent Document 1).
This function is called “eco-driving function” and saves fuel consumption without reducing the sensible temperature. In Patent Document 1, the same function is referred to as a “save operation function”.
That is, when the heating device is activated and the room temperature reaches a desired temperature and a considerable time has passed, the temperature of the walls and the furniture of the room rises, and these retain a considerable amount of heat energy. The user who is in the room is also warm. Therefore, even if the room temperature drops somewhat, the temperature of experience does not change greatly, and it is rare to feel cold.
The “eco-driving function” was invented from such an ergonomic point of view. It reached the target temperature that was set and input (hereinafter sometimes referred to as the initial target temperature), and the time has passed thereafter. As a condition, the target temperature is corrected downward to reduce the amount of combustion and save energy.

Japanese Patent No. 26009049

With the function called the “eco-operating function”, the hot air heating device of the prior art is corrected downward when the room temperature reaches the initial target temperature and further time passes later (hereinafter referred to as correction). Sometimes referred to as target temperature).
However, in the conventional hot air heating apparatus, when the operation is stopped once, the history information of the “eco-operation function” disappears, and when the operation is started again, the initial temperature input by the initial target temperature input switch is input. With the target temperature as the target temperature, the burner combustion amount and the blower fan air flow rate are controlled.
In other words, even if the burner or the like is controlled with the “eco-operating function” before the operation is stopped and the target temperature is corrected downward, the information is not utilized at the time of restarting in the conventional hot air heater. When restarted, the control is always started with the combustion amount of the burner and the air flow rate of the blower fan with the initial target temperature as the target.

  Therefore, even if the user pulls the power cord on his / her foot and the outlet is disconnected, and the user who has noticed immediately turns the outlet back on and restarts the hot air heater, the target temperature is set to the initial target temperature. Control is started on the burner combustion amount and the blower fan air flow rate. That is, if the hot air heater is stopped unintentionally and the hot air heater is restarted immediately after that, the walls and furniture in the room have considerable thermal energy, and the user's body is sufficient. However, the control of the burner or the like should be started with the correction target temperature as a target. However, this is not the case with the conventional hot air heating apparatus, and the control is started with the initial target temperature as a target. .

Further, after the restart, the temperature (initial target temperature) higher than the target temperature (corrected target temperature) immediately before the stop is controlled as the target temperature, so that the room temperature rises higher than the temperature immediately before the stop. . Here, the user's body is already used to the correction target temperature on the low temperature side, and when the room temperature reaches the initial target temperature on the high temperature side, the user feels heat.
The same problem also occurs when the warm-air heater is operated by the timer, the timer time expires, the hot-air heater is stopped, and the hot-air heater is restarted immediately thereafter. It is also a problem that occurs when a short interruption occurs due to a lightning strike and the hot air heater is restarted after the interruption.

The present invention focuses on the above-mentioned problems of the prior art is intended to improve the warm-air heating apparatus having a "eco-driving function", in case the warm-air heating device is stopped, the operation immediately before stop It is an object of the present invention to develop a hot air heating device having a function of determining a target temperature after restart according to conditions.

The invention described in claim 1 for solving the above-described problem is a hot air heating apparatus installed indoors, and includes a heating source, a blower fan, a room temperature detecting means for detecting a room temperature, and a room temperature detecting means. Temperature control means for controlling the heating source so that the detected temperature becomes the predetermined target temperature, the target temperature at the start of the hot air heater is set as the initial target temperature, and the detected temperature of the room temperature detecting means is the initial target temperature The heating source is controlled to reach the temperature, and the target temperature is changed to a corrected target temperature lower than the initial target temperature on the condition that the room temperature has reached the initial target temperature. In a warm air heater equipped with an eco-operation function that controls the heating source to reach the corrected target temperature, a timer that determines when the hot air heater is stopped by manual input and / or continuous use over a long period of time If It has a timer to dynamically stop the operation, after the target temperature is changed from an initial target temperature corrected target temperature by eco-driving function, in the timer by stops warm-air heating apparatus, further subsequent predetermined time When the hot air heater is manually restarted, the hot air heater is controlled such that the heating source is controlled to be a target temperature that is equal to or higher than the corrected target temperature and lower than the initial target temperature. .

The hot air heating device of the present invention has an “eco-operation function (synonymous with a save operation function)”, and the target temperature is lower than the initial target temperature on the condition that the room temperature has reached the desired room temperature. The correction target temperature is changed.
Here, in the hot air heating device of the present invention, the hot air heating device is stopped after the target temperature is changed from the initial target temperature to the corrected target temperature by the eco-operation function, and the hot air heating device is further stopped within a certain time thereafter. When restarted, the heating source is controlled so that the target temperature is equal to or higher than the corrected target temperature and lower than the initial target temperature. Therefore, as described above, when the hot air heater is stopped unintentionally and the hot air heater is restarted immediately thereafter, the heating source is controlled with a temperature lower than the initial target temperature.

  The invention described in claim 2 has a desired room temperature input means for inputting a desired room temperature by the user. At the time of start-up, the desired room temperature input by the desired room temperature input means is set as the initial target temperature, and the eco operation function is used. If the hot air heater is stopped after the target temperature is changed from the initial target temperature to the corrected target temperature, and the hot air heater is restarted within a certain time thereafter, the corrected target temperature is set as the target temperature. 2. The hot air heating device according to claim 1, wherein the heating source is controlled so that the state is maintained and the temperature detected by the room temperature detecting means becomes the corrected target temperature.

  In the present invention, when the hot air heater is restarted, the control is started under the operating condition immediately before stopping. Therefore, the user does not feel uncomfortable.

The reference example of the present invention has a function of stopping the operation of the hot air heater by a timer, and the cause of the stop of the hot air heater is that at least the stop by the timer and the power supply to the hot air heater are interrupted. Is included .

Examples of the timer include a timer that defines a stop time and a timer that defines an operation time. These timers are timers that are actively set by the user. Another example of the timer is a timer for preventing forgetting to turn off.
This example is a more specific embodiment of the first and second aspects of the invention, and facilitates the implementation of the invention.

According to the third aspect of the present invention, when the room temperature reaches the initial target temperature after startup and the state continues for a certain period of time, the target temperature is changed from the initial target temperature to the first corrected target temperature. The target temperature is changed to the second corrected target temperature that is lower than the first corrected target temperature on the condition that the corrected target temperature has been reached, and the target temperature is re-corrected target temperature once more if necessary. Equipped with an eco-operation function that controls the heating source so that the detected temperature of the room temperature detection means becomes the corrected target temperature after the change, and hot air heating with the target temperature changed to one of the corrected target temperatures When the device is stopped and the hot air heater is restarted within a certain period of time after that, the state where the corrected target temperature immediately before the stop is set as the target temperature is maintained, and the room temperature has reached the corrected target temperature. As one of the conditions The target temperature is warm-air heating apparatus according to claim 1 or 2, characterized in that it is changed to the next correction target temperature.

The warm air heating device of the present invention is a warm air heating device capable of correcting a target temperature over a plurality of times. And in the warm air heating device of the present invention, for example, when the warm air heating device is stopped after being changed to the first corrected target temperature, and the warm air heating device is restarted within a certain time thereafter, the warm air heating device has been described above. In this way, the control of the heating source is started with the first corrected target temperature as a target. In addition, in the present invention, the target temperature is changed to the second corrected target temperature on the condition that the state before the operation is stopped is taken over as it is and the room temperature has reached the first corrected target temperature.
If the configuration having the third and fourth correction target temperatures is adopted, for example, the hot air heating device is stopped after being changed to the second correction target temperature, and the hot air heating device is thereafter within a certain period of time. When is restarted, the control of the heating source is started with the second corrected target temperature as a target. In addition, in the present invention, the target temperature is changed to the third corrected target temperature on the condition that the state before the operation stop is taken over as it is and the room temperature reaches the second corrected target temperature.
In the invention according to claim 4, when the target temperature is changed from the initial target temperature to the corrected target temperature by the eco-operation function, the upper limit of the output of the heating source is regulated, and the corrected target temperature after the change is further increased. The temperature according to any one of claims 1 to 3, wherein when the second correction target temperature, which is a low correction target temperature, is changed, the upper limit of the output of the heating source is further restricted and suppressed to a lower level. It is a wind heater.

  The hot air heating apparatus of the present invention has a function of determining a target temperature after restarting according to the operating conditions immediately before stopping. Therefore, the hot air heating device of the present invention does not have the inconvenience of making the user feel cold, and can reduce energy consumption. Moreover, the hot air heating apparatus of the present invention does not feel hot after restarting.

It is a perspective view which shows the warm air heating apparatus concerning embodiment of this invention. It is a schematic side sectional view of the hot air heating device of FIG. It is a time chart which shows the relationship between the maximum combustion amount of the hot air heating apparatus of FIG. Shows the case where is temporarily stopped. It is a time chart which shows the relationship between the maximum combustion amount of the warm air heating apparatus of FIG. Shows the case where is temporarily stopped. It is a time chart which shows the relationship between the maximum combustion amount of the hot air heating apparatus of FIG. 1 and an actual combustion amount, the rotation speed of a ventilation fan, target temperature, and room temperature, and it is a disturbance when it is controlled aiming at 1st correction target temperature Indicates the case where the error occurred. It is a time chart which shows the relationship between the maximum combustion amount and actual combustion amount of the warm air heating device in other embodiment of this invention, the rotation speed of a ventilation fan, target temperature, and room temperature, and is controlled by making 2nd correction target temperature into a target. It shows the case where the operation stops temporarily during

Embodiments of the present invention will be further described below.
The hot air heating apparatus 1 of this embodiment is a gas fan heater that is used by being placed on an indoor floor, and includes a substantially rectangular parallelepiped casing 2 as shown in FIG. The housing 2 includes a combustion case 3, a blower fan 4, a control device 5, a room temperature detection thermistor (room temperature detection means) 6, and the like.
The hot air heating device 1 is supplied with electric power from a power supply system (not shown) (for example, a cord with a power plug and an outlet) to drive each device such as the blower fan 4 and the control device 5.

A housing side exhaust port 20 is provided in the lower part of the housing 2 as shown in FIG. An operation panel 10 is provided on the top surface of the housing 2. The operation panel 10 includes a display device 15 and various input devices including an operation switch 8, a desired room temperature input switch (desired room temperature input means) 11 and 12, an eco operation switching switch 13, and a timer setting switch 16.
Here, the operation switch 8 is a switch for starting or stopping the heating operation.
The desired room temperature input switch 11 is a temperature increase side switch, and increases the desired room temperature each time it is pressed or kept pressed. The desired room temperature input switch 12 is a temperature lowering switch, and the desired room temperature is lowered each time the button is pressed or kept pressed.
On the display device 15, the desired room temperature input by the desired room temperature input switches 11, 12 is displayed.
The eco driving changeover switch 13 is a switch for selecting whether or not to perform eco driving.

The timer setting switch 16 is a switch that determines when the hot air heating device 1 is manually stopped.
If it demonstrates more concretely, in this embodiment, the operation time of the warm air heating apparatus 1 can be prescribed | regulated. That is, when the time set in the timer elapses from the start of operation, the hot air heating device 1 automatically stops.
The stop time can also be defined by the timer setting switch 16. That is, the operation timer is a clock that recognizes time, for example, and the hot air heating device 1 automatically stops when the time set in the operation timer comes.
In addition, the warm air heating apparatus 1 of this embodiment has a built-in timer for preventing forgetting to turn off in addition to these manually input timers. This timer is a fixed timer whose time is set in advance at the time of shipment from the factory, and is a timer that automatically stops operation when the hot air heating device 1 is continuously used for a long time. In this embodiment, this timer is set to a time of about 5 hours to 10 hours.

  The operation panel 10 described above is connected to the control device 5 inside the housing 2, and can transmit information input by the user through various input devices to the control device 5. The information transmitted from the control device 5 can be displayed on the display device 15.

The combustion case 3 is a substantially rectangular parallelepiped box, and as shown in FIG. 2, a combustion mechanism including a burner 17, a thermocouple 18, a spark plug 19 and the like is incorporated therein. A gas supply path (not shown) is connected to the burner 17.
An electromagnetic valve (not shown) and a flow rate control valve (not shown) are provided in the gas supply path, and the fuel gas is supplied to the burner 17 by opening the electromagnetic valve. The amount of gas supplied is controlled to increase or decrease by a flow rate control valve. That is, the hot air heating device 1 of the present embodiment controls the combustion amount by pseudo proportional control. More specifically, the opening degree of the flow control valve is set in a plurality of stages, and the amount of fuel gas supplied to the burner 17 is changed in stages according to the deviation between the target temperature and room temperature. Increase or decrease.

A blower fan 4 is built in the vicinity of the lower end of the combustion case 3. That is, the lower part of the combustion case 3 constitutes a fan case, and the combustion case 3 is a combustion case integrated with a fan case.
The blower fan 4 is a DC fan, can change the rotation speed (rotation speed) of the impeller, and the amount of air blown out from the hot air heating device 1 increases or decreases.

A case-side exhaust port 22 is provided in the lower front portion of the combustion case 3. The case side exhaust port 22 communicates with the housing side exhaust port 20 of the housing 2.
As shown in FIG. 2, a case side intake port 23 for supplying primary air and secondary air to the inside of the combustion case 3 is provided on the back side of the combustion case 3.

  The control device 5 includes a control board including a microcomputer (not shown) that controls the hot air heating device 1, and controls the operation of each part of the hot air heating device 1.

Specifically, the control device 5 can acquire signals from various temperature sensors (thermistors) of the hot air heating device 1, the temperature inside the housing 2, the room in which the hot air heating device 1 is installed. It is possible to acquire temperature information such as room temperature, operating condition information related to the operation of each part, and the like. And control of each part of warm air heating device 1 is performed based on the acquired information.
That is, the control device 5 monitors the temperature of the room in which the hot air heating device 1 is installed by a room temperature detection thermistor (room temperature detection means) 6, and the temperature detected by the room temperature detection thermistor 6 is a predetermined target temperature. In this manner, the amount of gas supplied to the burner 17 and the rotational speed of the blower fan 4 are controlled.
In the present embodiment, temperature control means for controlling the heating source is configured by the control device 5 and a flow rate control valve (not shown).
In addition, as a configuration unique to the present embodiment, the control device 5 includes storage means for storing the current operating conditions. Further, as a unique configuration, the control device 5 has a program that regulates the upper limit of the combustion amount of the burner 17.

Next, the outline | summary of operation | movement of the warm air heating apparatus 1 shown to this embodiment is demonstrated.
The hot air heating apparatus 1 of this embodiment can start and stop the hot air heating apparatus 1 by operating the operation switch 8. Further, if the eco driving changeover switch 13 is turned on, the eco driving is automatically started when the target temperature changing conditions described later are met. If the eco-operation changeover switch 13 is turned on, the upper limit of the amount of gas supplied to the burner 17 is regulated with the start of the eco-operation, and an upper limit for control is provided for the combustion amount.

To explain sequentially, when the operation switch 8 is turned on, the blower fan 4 is activated and the burner 17 is ignited. Then, a large amount of air is mixed with the combustion gas generated from the burner 17, and the air that has become hot air is blown out of the housing 2 from the housing-side exhaust port 20.
Thus, in the warm air heating apparatus 1 of this embodiment, indoor temperature can be raised by taking in indoor air, heating it, and blowing it out.

Further, the control device 5 continuously acquires the room temperature by the room temperature detection thermistor 6 when the hot air heating device 1 is in the heating operation state. That is, while the warm air heating device 1 is performing the heating operation, the control device 5 performs an operation of acquiring the room temperature at regular time intervals (or always).
During the combustion operation, the acquired room temperature is compared with a predetermined target temperature, and the gas supply amount to the burner 17 is increased or decreased based on the comparison result. That is, the gas supply amount to the burner 17 is controlled in a pseudo proportional manner. More specifically, the amount of gas supplied to the burner 17 is increased or decreased stepwise so that the room temperature detected by the room temperature detection thermistor 6 matches a predetermined target temperature, and the rotational speed of the blower fan 4 is adjusted. The

Here, in the present embodiment, when the operation switch 8 is turned on and the hot air heating device 1 that has been in a stopped state is started up, in principle, the desired room temperature input by the desired room temperature input switches 11 and 12 is set as the initial target. The burner 17 and the like are controlled as the temperature.
For example, when the warm air heating device 1 was used last time and a considerable time has elapsed from the time when this use was finished, the room temperature has dropped to, for example, 10 ° C., and the desired room temperature input switch 11, 12 is 18 ° C., the burner 17 and the blower fan 4 are operated at full capacity (100% output) as shown in the time chart of FIG. Blows warm air and tries to bring the room temperature closer to 18 ° C.

And if the place where the warm air heating device 1 is installed is in a room in a normal ventilation state, the temperature in the room reaches 18 ° C. which is the initial target temperature after a few minutes.
Since the hot air heating apparatus 1 of this embodiment changes the combustion amount of the burner 17 stepwise according to the deviation as described above, the output of the burner 17 is automatically as shown in the time chart of FIG. The burner 17 burns with a weak heating power and maintains the room temperature in the vicinity of 18 ° C., which is the desired room temperature. The same applies to the blower fan 4, and the rotational speed gradually decreases.

  Here, the warm air heating device 1 of the present embodiment has an eco-operation changeover switch 13, and when performing eco-operation, the target temperature is corrected downward under a constant target temperature changing condition. Moreover, the upper limit of the output of the burner 17 is regulated.

That is, in the hot air heating apparatus 1 of the present embodiment, when the eco operation is selected, the indoor temperature is maintained at or near the initial target temperature of 18 ° C., and this state continues for a certain time or more. In this case, the target temperature for controlling the burner 17 and the like is changed to the corrected target temperature. That is, the condition that the room temperature has reached the initial target temperature is one of the conditions, and the target temperature is changed to the corrected target temperature on the condition that the initial target temperature near 18 ° C. or higher is maintained for a certain period of time. Is done.
Here, the “certain time” is the time required for the user's body to warm up, and the time required for the wall and furniture to retain a considerable amount of heat. Specifically, the “certain time” is about 20 to 60 minutes.

  In this embodiment, it is assumed that the initial target temperature is 18 ° C., and the state where the room temperature is around 18 ° C. continues for 30 minutes or more, from the initial target temperature input by the desired room temperature input switches 11 and 12. The burner 17 and the like are controlled with the temperature reduced once as the new target temperature. That is, the burner 17 and the like are controlled using 17 ° C. as the first correction target temperature.

Moreover, the warm air heating device 1 of the present embodiment has an upper limit change condition that the eco operation is started or the start conditions of the eco operation are met, and the target temperature is changed to the corrected target temperature. As a result, the upper limit of the output of the burner 17 is regulated, and the maximum output is suppressed by about 10%. That is, when the burner 17 is controlled with the initial target temperature as a target, the burner 17 is naturally operated with the upper limit of the heat generation capability of the burner 17 as the upper limit of output. That is, when the room temperature is sufficiently lower than the target temperature, the burner 17 burns at an output of 100% of its own heat generation capacity. When the room temperature approaches the target temperature, the amount of heat generation is gradually reduced to maintain the room temperature at the target temperature.
Here, in the hot air heating device 1 of the present embodiment, after the target temperature is corrected from the initial target temperature to the first correction target, the room temperature is sufficiently higher than the target temperature (first correction target temperature). Even if the temperature becomes low, the burner 17 does not exhibit 100% of its own heat generation capacity, and burns at an output of 90% of its heat generation capacity, for example.
As described above, in the hot air heating device 1 of the present embodiment, the opening degree of the flow control valve is set in a plurality of stages, and the opening degree of the flow control valve is stepwise according to the deviation between the target temperature and the room temperature. In this case, a configuration is adopted in which the amount of fuel gas supplied to the burner 17 is increased or decreased. Therefore, for example, the output of the burner 17 is set to ten stages, and normally the output can be changed from the first stage to the tenth stage, but the target temperature is corrected from the initial target temperature to the first correction target. After that, the output is changed stepwise between the first stage and the ninth stage.

Further, when the room temperature is maintained near 17 ° C., which is the first correction target temperature, and this state continues for a certain time or more, the target temperature for controlling the burner 17, the blower fan 4, and the like is the second correction target temperature. Changed to temperature.
More specifically, when the room temperature is in the vicinity of 17 ° C., which is the first target temperature, for 30 minutes or longer, a temperature obtained by further subtracting 1 ° C. from the current first target temperature is set as the new target temperature. The burner 17 and the like are controlled. That is, the burner 17 and the blower fan 4 are controlled with 16 ° C. as the new second correction target temperature.

Therefore, the upper limit of the output of the burner 17 is further restricted, and the maximum output is further suppressed by about 10%. In other words, when the burner 17 is controlled with the first corrected target temperature as a target, the target temperature is controlled from the first corrected target temperature in a stepwise manner where the increase / decrease control is performed with 90% of the heat generation capacity as the upper limit. After the correction to the second corrected target temperature, even if the room temperature becomes sufficiently lower than the target temperature (second corrected target temperature), the burner 17 will reduce 90% of its own heat generation capacity. For example, it burns at an output of 80% of the heat generation capacity.
In the warm air heating device 1 of the present embodiment, the output that can be changed from the first stage to the ninth stage is changed to the second correction target after the target temperature is corrected from the initial target temperature. The output is changed step by step between the first step and the eighth step.

Moreover, as a function peculiar to this embodiment, when the warm air heating device 1 is stopped and restarted immediately thereafter, the operation condition immediately after the stop is continued.
That is, the warm air heating device 1 of the present embodiment includes the storage means for storing the current operating conditions as described above. When the hot air heating device 1 is stopped, the operating conditions immediately before the stop are stored. It is left. Therefore, when the warm air heating device 1 is stopped and restarted immediately thereafter, the operation condition before the stop is read from the storage means, and the operation is restarted with the operation condition immediately before the stop.

That is, as shown in FIG. 3, if the hot air heating device 1 is stopped due to pulling out of the outlet or expiration of timing of the operation timer, for example, when the operation is performed with the second corrected target temperature as a target, the current target temperature is The second correction target temperature remains in the storage means. In addition, it remains in the storage means that the upper limit of the burner 17 output is 80% of the full capacity.
The same applies when a power failure occurs due to a lightning strike or the like, and the current target temperature and the upper limit of the output of the burner 17 remain in the storage means.

Then, for example, when the user notices that the outlet has been disconnected, reconnects the outlet, or notices that the timer has expired, resets the time, turns on the operation switch 8 again, and turns off the hot air heater 1 that has been stopped. When activated, the operating condition immediately before the stop is read from the storage means, and the burner 17 and the like are controlled to increase or decrease with the second corrected target temperature as the target temperature. The upper limit of burner 17 output is limited to 80% of full capacity.
Therefore, according to the hot air heating apparatus 1 of this embodiment, after restarting, the room temperature does not rise excessively, and fuel consumption is suppressed. Also, it does not make the user feel the heat.

In the present embodiment, when the hot air heating device 1 is stopped and restarted immediately after that, the operating condition immediately after the stop is continued, but “immediately” means that the room temperature or the sensible temperature of the user decreases. Means a short period of time. Specifically, a predetermined time is measured by a timer, and the operating condition before the stop is continued only when the warm air heating device 1 is restarted until the time elapses.
That is, in this embodiment, when the hot air heating device 1 is restarted within a certain time measured by the timer after the hot air heating device 1 is stopped, the control is started according to the operating condition before the stop. This “certain time” is determined by an empirical rule, and it is appropriate that it is within 10 minutes or within 5 minutes.

In the example described above, the case where the outlet is pulled out while operating with the second corrected target temperature as the target has been described. However, when the target is operated with the first corrected target temperature as the target. The same applies to the case where the operation is stopped at the same time, the operation condition immediately before the stop is read from the storage means, the burner 17 and the like are controlled to increase / decrease with the first correction target temperature as the target temperature, and the upper limit of the burner 17 output is the full capacity Limited to 90 percent (see FIG. 4).
Further, when the operation is stopped while the operation is being performed with the first correction target temperature as a target, the recording of the time during which the operation has been performed at the first correction target temperature is also continued.
That is, when the target is the first correction target temperature and there is a state where the room temperature is equal to or higher than the first correction target temperature for 10 minutes, the 10 minutes are taken over, and for the remaining 20 minutes, the room temperature is the first correction target temperature. If the temperature is equal to or higher than the temperature, the target temperature is changed to the second corrected target temperature. Therefore, according to the hot air heating apparatus 1 of this embodiment, after restarting, the room temperature does not rise excessively, and fuel consumption is suppressed.
Note that whether or not to continue recording the time during which the operation was performed at the first correction target temperature is arbitrary, and it may be desirable not to inherit this. Also, a method of subtracting a certain time from the previous operation time or adding only a certain ratio can be considered.

Next, the case where the warm air heating device 1 receives a disturbance will be described.
When a certain amount of time has elapsed since the warm air heater 1 is activated, the target temperature is lowered by the eco-operation function. And since the warm air heating device 1 of this embodiment employs pseudo proportional control, the burner 17 and the blower fan 4 are shown in FIGS. 3 and 4 if the room temperature is stable. As shown in the time chart of FIG. 5, steady operation is performed with a low output of about several percent of the capacity.
In this state, for example, if a room door is opened and a person enters or exits, the room temperature rapidly decreases as shown in FIG. For this reason, the difference between the target temperature and the room temperature increases, and it is required that the burner 17 and the blower fan 4 have a large output. That is, in this embodiment, since the output is set in a plurality of stages, it is required that the opening of a flow control valve (not shown) is opened in one stage or more.

Here, in the hot air heating device 1 of the present embodiment, the upper limit of the output of the burner 17 is regulated in conjunction with the lowering of the target temperature by the eco operation function. That is, as shown in the time chart of FIG. 5, when the operation is performed with the first correction target temperature as a target, the upper limit of the output of the burner 17 is restricted to 90% for control.
Therefore, in this embodiment, even if there is a large disturbance and the room temperature rapidly decreases, the output of the burner 17 does not exceed 90% of its capacity, and the combustion amount of the burner 17 and the blower fan 4 linked to this burner 17 The rotational speed does not increase excessively. Therefore, even if there is a disturbance, the operation sound of the blower fan 4 does not suddenly increase, and the user is not surprised.
That is, in the hot air heating apparatus 1 of the present embodiment, there is an upper limit on the amount of heat generated by the burner 4, and when the amount of heat generated by the heating source is increased or decreased to reach the target temperature, the upper limit is not exceeded. When the calorific value is adjusted and the target temperature is changed from the initial target temperature to the corrected target temperature by the eco-operation function, the upper limit of the calorific value of the heating source is corrected downward. However, the operation sound of the blower fan 4 does not suddenly increase, and the user is not surprised.

In the embodiment described above, when the hot air heating device 1 is stopped and restarted immediately after that, the operating condition immediately after the stop is continued as it is. That is, if the burner 17 or the like is controlled with the second corrected target temperature as a target immediately before the stop, the burner 17 or the like is controlled with the second corrected target temperature as a target even when restarted.
However, the target temperature after restart is not necessarily the same as that immediately before stopping, and may be slightly different. That is, after the target temperature is changed from the initial target temperature to the first corrected target temperature, or after the target temperature is changed to the second corrected target temperature, the hot air heating device 1 is stopped and restarted immediately thereafter. If the burner 17 or the like is controlled with a target temperature that is equal to or higher than the corrected target temperature immediately before the stop and lower than the initial target temperature, the operational effects of the present invention can be exhibited.

FIG. 6 is a time chart showing an example in which the burner 17 or the like is controlled with a temperature that is equal to or higher than the correction temperature just before the stop and lower than the initial target temperature. When the heating device 1 is stopped and the hot air heating device 1 is restarted immediately thereafter, the burner 17 and the like are controlled using the temperature between the second correction target temperature and the first correction target temperature as a new target temperature. .
Further, the target temperature after restart may be changed according to the stop time.

In the embodiment described above, the first correction target temperature is a temperature that is one degree lower than the initial target temperature, and the second correction target temperature is a temperature that is one degree lower than the first correction target temperature. However, this lowering width is arbitrary. In the above-described embodiment, the target temperature is decreased twice, but the number of decreases is also arbitrary.
However, it is necessary to lower the target temperature to such an extent that the sensed temperature does not change, and it is desirable that the range of reduction when the temperature is lowered is 0.5 ° C. to 2 ° C. Further, it is desirable that the maximum reduction width is 3 ° C. or less.

In the embodiment described above, the upper limit of the output of the burner 17 is limited to 90 percent of the capability of the burner 17 and then limited to 80 percent.
However, the upper limit value of the output of the burner 17 is not limited to this, and may be an upper limit setting that is looser than this, or may be an upper limit setting that is stricter than this. As a guideline for determining the upper limit, it is recommended to consider the relationship between the sound volume generated by the blower fan 4 and the load. That is, the sound generated by the blower fan 4 is not proportional to the load, and the generated sound tends to increase at an accelerated rate when approaching the upper limit of the capacity. That is, when the blower fan 4 is operated at 100% of capacity or in an overloaded state, a large noise is generated. However, there are many cases where there is no great difference in sound volume between when the blower fan 4 is operated at 50% of the capacity and when it is operated at 80% of the capacity.
Therefore, it is desirable that the upper limit value of the output of the burner 17 be lower than the rotation region where the sound generated by the blower fan 4 increases sharply. Commonly, the upper limit may be set to about 70% to 90% of the capacity.
Or if it operates in an overload state, a loud noise will be emitted. However, in terms of control, the operating capacity of the blower fan 4 is restricted to 80%.

As mentioned above, although embodiment of this invention was described taking the gas fan heater as an example, this invention is not limited to a gas fan heater, It can apply also to a petroleum fan heater. That is, in the previous embodiment, the gas burner is adopted as a heating source, but a kerosene burner may be adopted as a heating source.
Furthermore, the present invention can be applied to an electric heater or a heat pump as a heat source.

  In the embodiment described above, the output of the burner 17 is changed stepwise, but the output of the burner 17 may be changed steplessly. That is, the burner 17 may be proportionally controlled.

DESCRIPTION OF SYMBOLS 1 Hot air heating apparatus 4 Blower fan 5 Control apparatus 6 Thermistor for room temperature detection (room temperature detection means)
8 Operation switch 11, 12 Desired room temperature input switch (desired room temperature input means)

Claims (4)

A hot air heater installed indoors,
A heating source, a blower fan, a room temperature detecting means for detecting the room temperature, and a temperature control means for controlling the heating source so that the detected temperature of the room temperature detecting means becomes a predetermined target temperature,
The target temperature at the start of the hot air heater is set as the initial target temperature, and the heating source is controlled so that the detection temperature of the room temperature detection means becomes the initial target temperature,
As a condition that the room temperature has reached the initial target temperature, the target temperature is changed to a corrected target temperature lower than the initial target temperature, and the heating source is controlled so that the detected temperature of the room temperature detection means becomes the corrected target temperature. In the hot air heater with eco-drive function
A timer that determines when the hot air heater is stopped by manual input and / or a timer that automatically stops operation when continuously used for a long time;
When the target temperature is changed from the initial target temperature to the corrected target temperature by the eco-operation function, the hot air heater is stopped by the timer , and the hot air heater is manually restarted within a certain period of time thereafter The hot air heating device is characterized in that the heating source is controlled so that the target temperature is equal to or higher than the corrected target temperature and lower than the initial target temperature. The user has a desired room temperature input means for inputting a desired room temperature, and at the time of start-up, the desired room temperature input by the desired room temperature input means is used as an initial target temperature,
If the hot air heater is stopped after the target temperature is changed from the initial target temperature to the corrected target temperature by the eco-operation function, and the hot air heater is restarted within a certain period of time after that, the corrected target temperature is set. 2. The hot air heating apparatus according to claim 1, wherein the heating source is controlled so as to maintain the target temperature and the detected temperature of the room temperature detecting means becomes the corrected target temperature. If the room temperature reaches the initial target temperature after startup and the condition continues for a certain period of time, the target temperature is changed from the initial target temperature to the first corrected target temperature, and the room temperature reaches the first corrected target temperature. The target temperature is changed to a second corrected target temperature that is lower than the first corrected target temperature, and the target temperature is changed to the recorrected target temperature one or more times as necessary. Equipped with an eco-operation function to control the heating source so that the temperature becomes the corrected target temperature after the change,
If the hot air heater is stopped with the target temperature changed to one of the corrected target temperatures, and the hot air heater is restarted within a certain period of time after that, the corrected target temperature immediately before the stop is set to the target temperature. 3. The temperature according to claim 1, wherein the target temperature is changed to the next corrected target temperature under one of the conditions that the room temperature has reached the corrected target temperature. Wind heating device. When the target temperature is changed from the initial target temperature to the corrected target temperature by the eco-operation function, the upper limit of the output of the heating source is regulated,
  The upper limit of the output of the heating source is further restricted and suppressed lower when the corrected target temperature after the change is changed to a second corrected target temperature that is a lower correction target temperature. The hot-air heating apparatus in any one of thru | or 3.

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