JP6366361B2 - Hot air heater - Google Patents

Description

  The present invention relates to a warm air heating device that raises the temperature of air by mixing air sucked into a casing from a suction port with combustion exhaust gas of a combustor and blows out the heated air from a blower outlet.

Hot air heating devices such as gas fan heaters and oil fan heaters are a hot air circulation type that mixes the sucked indoor air with the combustion exhaust gas of the combustor and blows it back into the room again, with a large heating capacity, It is the most suitable heating equipment for heating the whole room.
Patent Document 1 discloses a combustor (2) for combusting fuel in a housing (1) having an inlet (4) for sucking air and an outlet (6) for blowing out air, and a combustor (2). A fuel amount adjusting means (7, 8, 9) for adjusting the amount of fuel to be supplied to the housing, an air intake into the housing (1) through the suction port (4), and a housing through the air outlet (6) An air flow means (5, 11) for flowing air so as to blow out air from inside the body (1) and a control means (22) for controlling the operation are provided, and the housing is provided from the suction port (4). (1) Hot air heating configured to raise the temperature of air by mixing the air sucked into the combustion exhaust gas of the combustor (2) and to blow out the heated air from the outlet (6) An apparatus is described.

  In addition, the hot-air heating device described in Patent Document 1 uses suction air temperature measurement means (13) for measuring the temperature of air sucked into the housing (1) from the suction port (4), and instructions related to operation. Driving instruction receiving means (14) for receiving from a person. Then, the control means (22) is configured so that the air temperature measured by the suction air temperature measurement means (14) and the first target temperature are adjusted so that the air temperature measured by the suction air temperature measurement means (14) becomes the target temperature. The target fuel supply amount to be supplied to the combustor (2) is determined based on the temperature difference between the target fuel supply amount and the fuel supply amount adjusting means (7, 8, 9) to supply the target fuel supply amount to the combustor (2). .

JP-A-6-281138

  In the hot air heating apparatus as described in Patent Document 1, the temperature of the air sucked into the housing (1) from the suction port (4), that is, the temperature of the indoor air is set to a target temperature such as 22 ° C., for example. Since the amount of fuel combusted in the combustor is adjusted so that the temperature of the hot air blown from the outlet becomes higher than the target temperature. For example, at the time of maximum combustion in which the maximum amount of fuel is supplied to the combustor, the temperature of the hot air blown out from the outlet may be about 100 ° C. Therefore, when the human body touches the parts of the air outlet heated by the hot air, there is a possibility that it may become a burn or a symptom close thereto.

  As described above, the conventional warm air heating device is very useful in a scene that exhibits a high heating capability of heating the air in the entire room, but because of the high heating capability, There were also problems associated with higher temperatures. Therefore, although the heating capacity is low, an electric heating apparatus with relatively small problems such as hot air blowing out at a high temperature and parts becoming hot may be used. When such an electric heating device is used, the entire room cannot be heated to a comfortable temperature because of its low heating capacity. Therefore, the air conditioner and the like must also be operated, and as a result, there is a problem that the cost (electricity cost) required for heating increases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a hot air heating apparatus that can adjust the temperature of hot air blown to a desired temperature while ensuring high heating capacity. There is in point to do.

In order to achieve the above object, the hot air heating apparatus according to the present invention is characterized in that a combustor that burns fuel in a housing having a suction port for sucking air and a blower port for blowing air, and the combustor A fuel amount adjusting means for adjusting a fuel amount to be supplied to the air, and air is sucked into the housing through the suction port and air is blown out from the housing through the outlet. Air flow means for flowing, and control means for controlling the operation, the air sucked into the casing from the suction port is mixed with the combustion exhaust gas of the combustor to raise the temperature of the air, A hot air heater that blows out the air from the outlet,
Suction air temperature measuring means for measuring the temperature of air sucked into the housing from the suction port;
Driving instruction receiving means for receiving driving instructions from the user,
The control means includes
The intake air temperature measurement is performed so that the temperature of the air measured by the intake air temperature measurement unit becomes the first target temperature when the operation instruction reception unit receives an operation execution instruction in the first heating operation mode. The target supply to be supplied to the combustor from the total supply fuel amount range between the minimum supply fuel amount and the maximum supply fuel amount based on the temperature difference between the air temperature measured by the means and the first target temperature. A fuel amount is determined, the target fuel supply amount is supplied to the combustor by the fuel amount adjusting means, and
When the operation instruction receiving means receives an operation execution instruction in the second heating operation mode, the amount of fuel supplied to the combustor and when combustion is performed with the amount of supplied fuel, the inside of the casing is Predicted temperature rise characteristics in which the relationship with the predicted rise temperature predicted to rise while the temperature of the air sucked into the air outlet is blown out from the air outlet, and the air measured by the intake air temperature measuring means A target supply fuel amount to be supplied to the combustor is determined from the total supply fuel amount range so that the temperature of the air blown from the outlet becomes a second target temperature, A target fuel supply amount is supplied to the combustor by the fuel amount adjusting means ;
The driving instruction receiving means is a temperature value group including a plurality of temperature values as the first target temperature and at least one temperature value as the second target temperature each time it is pushed by a user. It has a temperature setting switch that changes the setting of any one of the temperature values sequentially,
When the temperature value as the first target temperature is set by the temperature setting switch, the control means determines that the operation instruction reception means has received an operation execution instruction in the first heating operation mode. lies in you determined that the operation instruction reception means is accepting an instruction to execute the operation in the second heating operation mode when the temperature value is set as the second target temperature by the temperature setting switch .

  According to the above characteristic configuration, when the operation instruction accepting unit accepts an operation execution instruction in the first heating operation mode, the control unit performs a temperature of air sucked into the housing from the suction port (for example, a hot air heating device) The amount of fuel supplied to the combustor is adjusted so that the temperature of the indoor air in which is installed) becomes the first target temperature. As a result, the temperature in the room where the hot air heater is installed approaches a comfortable state for the user.

  In addition, the hot air heating device of this feature configuration does not include a temperature measuring means for measuring the temperature of the air blown out from the outlet, but measures the temperature of the air sucked into the housing from the inlet. The operation (second heating operation mode) in which the temperature of the air blown out from the outlet is set to a desired temperature by using the means can also be executed by switching to the first heating operation mode.

The second heating operation mode in which the temperature of the air blown from the blower outlet is set to a desired temperature without providing sensors for measuring the temperature of the air blown from the blower outlet, If the amount of fuel supplied to the combustor is determined, a predicted increase that is expected to increase while the temperature of the air sucked into the housing from the suction port is blown out from the outlet when combustion is performed with the amount of fuel supplied This is based on the knowledge that the temperature can be estimated. That is, in this feature configuration, when the operation instruction receiving means receives an operation execution instruction in the second heating operation mode, the control means performs combustion with the amount of fuel supplied to the combustor and the amount of supplied fuel. Predicted temperature rise characteristics that are expected to rise while the temperature of the air sucked into the housing from the suction port is expected to rise while it is blown out from the air outlet, and measurement of the intake air temperature Based on the temperature of the air sucked into the casing from the suction port measured by the means, the temperature of the air blown out from the blowout port is supplied to the combustor from within the entire supply fuel amount range so as to become the second target temperature. A target supply fuel amount is determined, and the target supply fuel amount is supplied to the combustor by the fuel amount adjusting means. In other words, the suction air temperature measuring means that is also used in the operation in the first heating operation mode is used so that the temperature of the air blown from the outlet becomes the second target temperature while suppressing an increase in cost. Operation in 2 heating operation mode is performed. As a result, in the first heating operation mode, in order to set the temperature of the air sucked into the housing from the suction port to the first target temperature, relatively high temperature air (a temperature higher than the first target temperature) However, in the second heating operation mode, it is possible to perform an operation such that the temperature of the air blown from the outlet is the second target temperature.
Therefore, it is possible to provide a hot air heater that can adjust the temperature of the hot air blown out to a desired temperature while ensuring a high heating capacity.
Further, according to the above characteristic configuration, each time the user presses the temperature setting switch, the temperature value group includes a plurality of temperature values as the first target temperature and at least one temperature value as the second target temperature. Any one of the temperature values is sequentially changed. That is, since the first target temperature for the first heating operation mode and the second target temperature for the second heating operation mode can be set using one temperature setting switch, the switch for setting the first target temperature; A switch for setting the second target temperature may not be separately mounted on the hot air heater.
In addition, the control means determines that the operation in the first heating operation mode is instructed when the temperature value as the first target temperature is set by the temperature setting switch, and the second target is set by the temperature setting switch. When the temperature value as the temperature is set, since it is determined that the operation of the operation in the second heating operation mode is instructed, a switch for the user to instruct the operation in the first heating operation mode; The switch for instructing the operation in the second heating operation mode may not be separately installed in the hot air heater.

  Another characteristic configuration of the hot air heating apparatus according to the present invention is that the operation instruction receiving means is configured to receive an instruction for changing the second target temperature from a user.

  According to the above characteristic configuration, since the user can change the second target temperature, the temperature of the air blown out from the outlet (second target temperature) can be set to a temperature preferable for the user.

  Still another characteristic configuration of the hot air heating device according to the present invention is that the control unit is in operation in the first heating operation mode, and the operation instruction receiving unit is instructed to execute the operation in the second heating operation mode. If the state in which relatively high-temperature air is blown out from the air outlet continues for a predetermined period or longer during operation in the first heating operation mode, the temperature of the air blown out from the air outlet After performing the temperature reduction process that continues the state where the temperature is relatively low for a certain period, the operation in the second heating operation mode is started.

If the state in which relatively high-temperature air is blown out from the air outlet during operation in the first heating operation mode continues for a predetermined period or longer, the parts of the air outlet that are continuously in contact with the hot air There is a high possibility that the temperature is too high. Therefore, at the time of switching from the operation in the first heating operation mode to the operation in the second heating operation mode, there is a possibility that the parts of the outlet are still at a high temperature. And in the 2nd heating operation mode, the user approaches the blower outlet and the parts of the blower outlet are intended to suppress the temperature of the air blown from the blower outlet to a relatively low temperature (second target temperature). If touched, there is a possibility of burns at the parts of the air outlet that are still hot.
However, in this feature configuration, the control means receives relatively high-temperature air from the outlet during operation in the first heating operation mode even if the operation instruction reception means accepts an operation execution instruction in the second heating operation mode. If the state where the air is blown out continues for a predetermined period or longer, the second heating operation is performed after performing the temperature lowering process for continuing the state where the temperature of the air blown out from the air outlet is relatively low for a certain period of time. Start operation in mode. That is, the temperature of the air outlet component can be lowered by allowing relatively low-temperature air to come into contact with the air outlet component during the temperature lowering process. As a result, during operation in the second heating operation mode, even if the user approaches the air outlet and touches the parts of the air outlet, there will be no burns.

  Still another characteristic configuration of the hot air heating apparatus according to the present invention is that the control means performs the temperature lowering process in a state where the fuel supply to the combustor is cut off by the fuel amount adjusting means.

  According to the above characteristic configuration, the control means performs the temperature reduction process in a state in which the fuel supply to the combustor is shut off by the fuel amount adjustment means. Only air will touch the outlet. As a result, the temperature of the parts of the outlet can be effectively reduced.

  Still another characteristic configuration of the hot air heating device according to the present invention includes an internal temperature measuring means for measuring the internal temperature of the casing, and the control means has a predetermined normal temperature measured by the internal temperature measuring means. When the temperature exceeds the upper limit temperature, in the relationship between the amount of fuel supplied to the combustor specified in the predicted temperature rise characteristic and the predicted increase temperature, the amount of supplied fuel is relatively relative to the predicted increase temperature. The point is that correction is performed to decrease the value.

If air is flowing normally through the air path inside the housing, fresh air at an appropriate flow rate will continue to be supplied to the inside of the housing, so the temperature inside the housing will rise excessively. There is no. However, for example, if dust or the like adheres to the suction port of the housing, the air flow inside the housing becomes worse. And since only a smaller amount of air than the amount of air required for the amount of fuel to be burned can be supplied to the combustor, the temperature of the air blown out from the outlet also rises. As a result, in the operation in the second heating operation mode, even if an attempt is made to set the temperature of the air blown from the air outlet to the second target temperature, the temperature of the air actually blown from the air outlet is higher than the second target temperature. It can be very expensive.
However, according to this characteristic configuration, when the temperature measured by the internal temperature measuring unit becomes equal to or higher than a predetermined normal upper limit temperature, the control unit increases the amount of fuel supplied to the combustor defined by the predicted temperature rise characteristic and the predicted increase. In relation to the temperature, correction is performed so that the amount of supplied fuel decreases relative to the predicted rise temperature. That is, the operation in the second heating operation mode is performed in consideration of the fact that the temperature of the air actually blown out from the air outlet changes to the rising side. As a result, it is possible to reduce the possibility that the temperature of the air actually blown from the blowout port will be significantly higher than the second target temperature.

Still another characteristic configuration of the hot air heating device according to the present invention is such that the fuel amount adjusting means has a proportional valve that changes the valve opening corresponding to the amount of fuel supplied to the combustor stepwise.
The control means is that the amount of fuel supplied to the combustor is changed stepwise by changing the valve opening of the proportional valve stepwise.

When the valve opening of the proportional valve changes continuously, the amount of fuel supplied to the combustor also changes continuously. As a result, the predicted temperature rise value in the predicted temperature rise characteristic also needs to be prepared as a value that continuously changes in accordance with the change in the amount of fuel supplied to the combustor (the valve opening of the proportional valve). . Therefore, when the value of the predicted rise temperature relative to the amount of fuel supplied to the combustor (the valve opening of the proportional valve) is determined by experiment, the amount of fuel supplied to the combustor (the valve opening of the proportional valve) is finely changed. Every time, it is necessary to conduct a very time-consuming experiment of measuring the temperature that rises while the temperature of the air sucked into the housing from the suction port is blown out from the blowout port.
On the other hand, according to this characteristic configuration, the control means changes the amount of fuel supplied to the combustor stepwise by changing the valve opening of the proportional valve stepwise. That is, the predicted temperature increase value in the predicted temperature increase characteristic may be prepared as a value that changes stepwise in accordance with the change in the amount of fuel supplied to the combustor (the valve opening of the proportional valve). Therefore, even if the value of the predicted rise temperature relative to the amount of fuel supplied to the combustor (the valve opening of the proportional valve) is determined by experiment, the amount of fuel supplied to the combustor (the valve opening of the proportional valve) It is only necessary to conduct a relatively small experiment to measure the temperature that rises while the temperature of the air sucked into the housing from the suction port is blown out from the blowout port each time the air pressure is changed stepwise.

It is a schematic block diagram of the warm air heating apparatus of 1st Embodiment. It is a figure which shows the structural example of the driving operation reception part of 1st Embodiment. It is a figure which shows the example of a transition of the information displayed on the set room temperature display part of 1st Embodiment. It is a functional block diagram of the warm air heating device of a 1st embodiment. It is a flowchart explaining the heating operation of 1st Embodiment. It is a figure which shows the example of a transition of the information displayed on the set room temperature display part of 2nd Embodiment, and the present room temperature display part. It is a flowchart explaining the heating operation of 2nd Embodiment. It is a figure which shows the structural example of the driving operation reception part of 3rd Embodiment. It is a figure which shows the example of a transition of the information displayed on the set room temperature display part of 3rd Embodiment, and the present room temperature display part. It is a flowchart explaining the heating operation of 4th Embodiment.

<First Embodiment>
The hot air heating device 100 of the first embodiment will be described below with reference to the drawings.
Drawing 1 is a schematic structure figure of the warm air heating device of a 1st embodiment. Specifically, FIG. 1A is a front perspective view showing an arrangement state of main components of the hot air heating device 100, and FIG. 1B is a cross-sectional view of the hot air heating device 100 as viewed from the side. FIG. As shown in the drawing, the hot air heating apparatus 100 includes a combustor 20 that burns fuel in a housing 10 that has a suction port 70 that sucks air and a blowout port 72 that blows out air, and fuel that is supplied to the combustor 20. The air flows in such a manner that the fuel amount adjusting means F for adjusting the amount of air, the intake of air into the housing 10 through the suction port 70, and the blowing of air from the inside of the housing 10 through the air outlet 72. A convection fan 40 (an example of the “air flow means” of the present invention) and a control means 80 for controlling the operation, and the air sucked into the housing 10 from the suction port 70 and the combustion exhaust gas of the combustor 20. It is an apparatus configured to raise the temperature of the air by mixing and to blow out the heated air from the outlet 72. In addition, the warm air heating device 100 includes an indoor temperature sensor 1 (an example of the “intake air temperature measuring means” of the present invention) that measures the temperature of the air sucked into the housing 10 from the suction port 70, and an instruction regarding operation. A driving operation receiving unit 50 (an example of “driving instruction receiving means” in the present invention) that receives from a user is provided.

  The casing 10 of the warm air heating device 100 is provided with a suction port 70 for taking outside air as combustion air A on the back surface, and blows out a mixed gas of combustion exhaust gas and air after combustion as warm air on the front surface. An air outlet 72 is provided. An air filter 71 for capturing dust is set outside the suction port 70.

  The combustor 20 burns the fuel gas G together with the combustion air A. Specifically, a fuel gas passage 24 that guides the fuel gas G is connected to the combustor 20, and a first electromagnetic that stops or allows the fuel gas G to flow through the fuel gas passage 24. A valve 26a and a second electromagnetic valve 26b, a proportional valve 25 capable of adjusting the flow rate of the fuel gas G, and an injection nozzle 23 for injecting the fuel gas G toward the combustor 20 are provided in order from the upstream side to the downstream side. It has been. Among these, the 1st electromagnetic valve 26a, the 2nd electromagnetic valve 26b, and the proportional valve 25 function as the fuel quantity adjustment means F which adjusts the fuel quantity supplied to the combustor 20. The reason why the two solenoid valves (the first solenoid valve 26a and the second solenoid valve 26b) are provided is to more reliably prevent the fuel gas G from leaking to the downstream side of the fuel gas passage 24. is there. In addition, the combustor 20 can detect the extinction of the flame by detecting the formed flame and the igniter 21 that ignites the mixture of the fuel gas G and the combustion air A guided to the combustion chamber 22. The flame sensor 4 is provided.

  The convection fan 40 as the air flow means of the present invention includes a cross flow fan 41 and a fan drive motor 42 that rotates the cross flow fan 41 in the circumferential direction. When the fan driving motor 42 rotates the cross flow fan 41, outside air is taken into the housing 10 from the suction port 70. A part of the air sucked into the housing 10 is guided to the combustion chamber 22 of the combustor 20 as combustion air A, and the remaining air flows around the combustion chamber 22 while flowing around the combustion chamber 22. Mixed with flue gas. As a result, the temperature of the air sucked into the housing 10 from the suction port 70 is raised and blown out from the air outlet 72 to the outside of the housing 10.

  On the back surface of the housing 10, there is provided an indoor temperature sensor 1 that can measure the temperature of ambient air, that is, the temperature of indoor air in which the hot air heating device 100 is used. That is, the indoor temperature sensor 1 functions as a suction air temperature measurement unit that measures the temperature of air sucked into the housing 10 from the suction port 70.

FIG. 2 is a diagram illustrating a configuration example of the driving operation reception unit 50 of the first embodiment, and FIG. 3 is a diagram illustrating a transition example of the first target temperature displayed on the set room temperature display unit 57 of the first embodiment. FIG. 4 is a functional block diagram of the hot air heating device of the first embodiment.
The driving operation reception unit 50 is provided on the top surface of the housing 10 and receives an instruction regarding driving from the user. The driving operation reception unit 50 is a nighttime timer switch S1, a good morning timer switch S2, an eco-operation switch S3, a hot air temperature fixing mode switch (operation mode changeover switch) S4, as operation switches operated by a user or the like. It has a temperature / time setting switch (temperature setting switch) S5 (upward switch S5a, downward switch S5b) and an operation / stop switch S6. In addition, the driving operation reception unit 50 is a display unit that indicates the state of the hot air heating device 100. The good night timer lamp 51 that is lit during the setting of the good night timer and the good morning timer lamp that is lit during the setting of the good morning timer 52, an eco-operating lamp 53 that is lit during execution of eco-driving, a hot-air temperature fixing mode lamp 54 that is lit during execution of hot-air temperature fixing mode operation, and a filter provided in the suction port 70 A filter cleaning lamp 55 that is lit to notify the user of clogging, an operation status display lamp 56 that is lit when driving, and numbers, letters, symbols, and the like that indicate the set room temperature are displayed. And a current room temperature display unit 58 for displaying numbers, characters, symbols, and the like representing the current room temperature.

  The operation / stop switch S6 is a switch for instructing start and stop of operation. When the user presses the operation / stop switch S6 when the hot air heating apparatus 100 is in a stopped state, the control unit 80 receives the operation as an instruction to start the operation and turns on the operation state display lamp 56. . When the user presses the operation / stop switch S6 while the hot air heating device 100 is in operation, the control unit 80 accepts the operation as an instruction to stop operation and also displays an operation state display lamp. 56 is turned off.

  The control means 80 is a device configured using an electric circuit unit having an arithmetic processing function such as a microcomputer and an information storage function such as a semiconductor memory. Then, the control means 80 operates the hot air heater 100 in the normal mode (corresponding to the “first heating operation mode” of the present invention) and the hot air temperature fixing mode (the “second heating operation mode” of the present invention). The operation is switched and executed according to instructions from the user. In the present embodiment, the control means 80 determines that the operation execution instruction in the normal mode has been received unless the hot air temperature fixing mode switch S4 (described later) is operated, and the hot air temperature fixing mode is set. If the switch S4 is “ON”, it is determined that the operation execution instruction in the hot air temperature fixed mode is received. That is, in the present embodiment, the hot air temperature fixing mode switch S4 corresponds to the “operation mode changeover switch” of the present invention.

  When the control unit 80 receives an operation execution instruction in the normal mode, the indoor temperature sensor 1 is set so that the temperature of the air measured by the indoor temperature sensor 1 as the intake air temperature measuring unit becomes the first target temperature. The target supply fuel amount to be supplied to the combustor 20 from the total supply fuel amount range between the minimum supply fuel amount and the maximum supply fuel amount based on the temperature difference between the air temperature measured by the engine and the first target temperature And the target fuel supply amount is supplied to the combustor 20 by the fuel amount adjusting means F. In the present embodiment, the proportional valve 25 constituting the fuel amount adjusting means F is a step proportional valve that changes the valve opening corresponding to the amount of fuel supplied to the combustor 20 in a stepwise manner. And the control means 80 changes the fuel amount supplied to the combustor 20 in steps by changing the valve opening degree of the proportional valve 25 in steps. Table 1 shows an example of a total supply fuel amount range between the minimum supply fuel amount and the maximum supply fuel amount that the fuel amount adjusting means F can supply to the combustor 20. As shown in Table 1, the valve opening degree of the proportional valve 25 has a total of 12 stages from 1 stage (minimum supply fuel amount) to 12 stages (maximum supply fuel amount). For example, the amount of fuel supplied to the combustor 20 when the valve opening is one stage corresponds to 0.76 kW in terms of heating capacity. As the number of stages of the valve opening increases, the amount of fuel supplied to the combustor 20 (heating capacity) increases. The control means 80 controls the operating state of the convection fan 40 so as to supply the combustor 20 with air corresponding to the amount of fuel supplied to the combustor 20.

  The first target temperature when the control means 80 operates in the normal mode can be set by the user operating the temperature / time setting switch (temperature setting switch) S5. For example, the control means 80 displays the first target temperature or the initial value input by the user on the set room temperature display unit 57 when operating in the normal mode. Each time the user presses and operates the upward switch S5a, the display value of the temperature is sequentially increased and changed, and every time the user presses and operates the downward switch S5b, the display value of the temperature is sequentially decreased and changed.

  FIG. 3 is a diagram illustrating a transition example of the first target temperature displayed on the set room temperature display unit 57 of the first embodiment. In this example, the user can set the temperature from 12 ° C. to 26 ° C. as the first target temperature in the normal mode in increments of 1 ° C. Although illustration is omitted, at this time, the temperature currently measured by the room temperature sensor 1 is displayed on the room temperature display unit 58. In addition, the user can set “L (low)” as a setting state corresponding to a setting temperature lower than 12 ° C., and “H (high)” as a setting state corresponding to a setting temperature higher than 26 ° C. Can be set. For example, when “L (low)” is set, the set temperature is a low temperature such as 10 ° C., and when “H (high)” is set, the set temperature is a high temperature such as 45 ° C. . These setting states are sequentially changed by one step each time the user pushes the upward switch S5a and the downward switch S5b.

  The nighttime timer switch S1 is a switch for making a reservation for stopping operation. When the user performs an “ON” operation on the sleep timer switch S1, the control unit 80 receives the operation as a reservation instruction for stopping the operation of the hot-air heating device 100 that is currently operating. For example, when the user performs an “ON” operation on the sleep timer switch S1, the control means 80 turns on the sleep timer lamp 51 and displays a number (initial value) indicating how many minutes the operation is stopped on the set room temperature display unit 57. ) Is displayed. Then, the control unit 80 increases the displayed time in response to the user pressing and pressing the upper switch S5a of the temperature / time setting switch S5, or the lower direction of the temperature / time setting switch S5. By reducing the displayed time in response to the user pressing the switch S5b, the displayed time is set as the remaining time until the operation is stopped. However, the upper limit of the time that can be set by this sleep timer is 60 minutes, for example.

  The good morning timer switch S2 is a switch for making a reservation for starting operation. When the user performs an “on” operation on the good morning timer switch S2, the control means 80 accepts the operation as a reservation instruction for starting the operation of the hot air heating apparatus 100 that is currently stopped. For example, when the user performs an “ON” operation on the good morning timer switch S2, the control means 80 turns on the good morning timer lamp 52 and also displays a number (initial value) indicating how many hours later the operation starts on the set room temperature display unit 57. ) Is displayed. Then, the control unit 80 increases the displayed time in response to the user pressing and pressing the upper switch S5a of the temperature / time setting switch S5, or the lower direction of the temperature / time setting switch S5. By reducing the displayed time in response to the user pressing the switch S5b, the displayed time is set as the remaining time until the start of operation.

  The eco-operation switch S3 is a switch for instructing execution of an operation that relatively reduces the amount of fuel consumed by the hot air heating device 100. When the user “turns on” the eco-operation switch S3, the control means 80 accepts the operation as an instruction to execute the eco-drive. For example, when the user presses the eco-operation switch S3, the control unit 80 turns on the eco-operation lamp 53 and starts operation in the eco-operation mode. In the operation in the eco operation mode, the control unit 80 maintains the first target temperature for 30 minutes when the indoor temperature measured by the indoor temperature sensor 1 rises to the first target temperature while performing the operation in the normal mode. Then, the operation in the normal mode is continued in a state where the target temperature in actual operation control is lowered by 1 ° C. from the first target temperature. Note that the first target temperature displayed on the set room temperature display unit 57 remains the first target temperature set by the user. Then, the control means 80 further operates for 30 minutes, and if the indoor temperature measured by the indoor temperature sensor 1 is equal to or higher than the target temperature (a temperature lower by 1 ° C. than the first target temperature), the actual operation control is further performed. Lower the set temperature by 1 ° C. In this way, the fuel cost can be saved by gradually lowering the set room temperature without greatly impairing the sensed temperature.

  The hot air temperature fixing mode switch S4 is a switch for instructing execution of the second heating operation mode of the present invention (the hot air temperature fixing mode described in the present embodiment). When the hot air temperature fixing mode switch S4 is in the state of being “on”, the control means 80 operates the hot air heating device 100 in the hot air temperature fixing mode, and the hot air temperature fixing mode switch S4 is operated to “turn off”. If it is in the state, the control means 80 will operate the warm air heating apparatus 100 in a normal mode. As described above, the hot air temperature fixing mode switch S4 functions as an operation mode switching switch for switching between the normal mode (first heating operation mode) and the hot air temperature fixing mode (second heating operation mode). As described above, the hot air temperature fixing mode switch S4 is a dedicated operation mode changeover switch for accepting execution and stop of the operation in the hot air temperature fixing mode from the user. In this embodiment, when the user operates the hot air temperature fixing mode switch S4, the control means 80 switches the operation to the hot air temperature fixing mode, and the hot air temperature fixing mode switch S4 is "ON". The hot air temperature fixing mode switch S4 is kept in the “ON” state even after the operation is stopped.

Inside the housing 10, a temperature sensor 2 for main body for measuring the internal temperature is provided. In the example shown in FIG. 1, the in-body temperature sensor 2 measures the temperature at the downstream side of the combustor 20 and the portion where the mixed gas flows after the combustion exhaust gas and air are mixed. The control means 80 performs control such as stopping the combustor 20 when it is determined that the measured temperature of the in-body temperature sensor 2 has reached an abnormally high temperature range. The possibility that the measured temperature of the in-body temperature sensor 2 reaches such an abnormally high temperature range is likely to be clogging of the filter provided in the suction port 70. Therefore, when it is determined that the measured temperature of the in-body temperature sensor 2 has reached an abnormally high temperature range, the control means 80 turns on the filter cleaning lamp 55 in order to notify the user of this problem.
Further, a circuit temperature fuse 3 is provided in the middle of the electric circuit constituting the control means 80 and the like to disconnect the electric circuit when the temperature of the electric circuit exceeds a predetermined level. That is, when the circuit temperature fuse 3 is blown at a predetermined temperature, the operation of the electric circuit (that is, the control means 80) is stopped before the temperature that the electric circuit can withstand, and the operation of the hot air heater 100 is performed. It is stopped and the electric circuit is prevented from being damaged by heat.

When the hot air temperature fixing mode switch S4 as the operation instruction receiving means receives an operation execution instruction in the hot air temperature fixing mode (second heating operation mode), the control means 80 performs the predicted temperature increase characteristic and the room temperature. Based on the temperature of the air measured by the sensor 1, the combustor 20 is selected from the total supply fuel amount range shown in Tables 1 and 2 so that the temperature of the air blown from the blowout port 72 becomes the second target temperature. The target supply fuel amount to be supplied to the fuel is determined, and the target supply fuel amount is supplied to the combustor 20 by the fuel amount adjusting means F. Here, the predicted temperature rise characteristic is that the amount of fuel supplied to the combustor 20 and the temperature of the air sucked into the housing 10 from the suction port 70 when combustion is performed with the supplied fuel amount are blown out from the blowout port 72. The relationship with the predicted rise temperature that is expected to rise during the period is defined in advance. Table 2 shows an example of the predicted temperature rise characteristic referred to by the control means 80 in the present embodiment. In addition, the value of the predicted rise temperature with respect to the proportional stage number shown in Table 2 is a value determined based on the experimental result under a predetermined condition. Table 2 also describes an example in which the temperature of the air blown out from the outlet 72 is derived when the room temperature is 22 ° C. and 7 ° C.
In the present embodiment, the second target temperature is one temperature value (for example, 60 ° C.) stored in advance by the control unit 80, and the setting of the second target temperature cannot be changed by the user.

  As shown in Table 2, for example, when combustion is performed with the fuel amount supplied to the combustor 20 when the number of stages of the valve opening of the proportional valve 25 is 12, the inside of the housing 10 It can be predicted that the temperature of the room air sucked into the air rises by 64 (K) while being blown out from the air outlet 72. In other words, if the room temperature is 7 ° C., and the number of stages of the valve opening of the proportional valve 25 is 12, the predicted rise temperature (64K) corresponding to the number of stages (12 stages) with respect to the room temperature (7 ° C.) A value (71 ° C.) obtained by addition becomes the predicted temperature of the air blown out from the blowout port 72. Similarly, when combustion is performed with the amount of fuel supplied to the combustor 20 when the number of stages of the valve opening of the proportional valve 25 is nine, the indoor air sucked into the housing 10 from the suction port 70 It can be predicted that the temperature will rise by 52 (K) while it is blown out of the outlet 72. That is, if the indoor temperature is 7 ° C., it can be predicted that warm air of 59 ° C. will be blown out from the outlet 72.

Next, operation control of the hot air heating device 100 will be described.
FIG. 5 is a flowchart for explaining the heating operation of the first embodiment. When the operation / stop switch is “turned on”, the control unit 80 proceeds to step # 10 and performs an operation start process. In this operation start process, when the hot air heating device 100 is switched from the operation stop state to the operation state, the control means 80 opens the first electromagnetic valve 26a and the second electromagnetic valve 26b and opens the proportional valve 25 to a predetermined value. The fuel gas G is injected from the injection nozzle 23 into the combustion chamber 22 of the combustor 20. At the same time, the control means 80 drives the fan driving motor 42 to operate the convection fan 40 and guides the combustion air A to the combustion chamber 22. The control means 80 ignites and burns the mixture of the fuel gas G and the combustion air A by the igniter 21.

  Next, in step # 11, the control unit 80 determines whether or not the hot air temperature fixing mode is in the “ON” state. If the hot air temperature fixing mode is not in the “ON” state, the control unit 80 proceeds to step # 12. The operation is performed in the normal mode, and when the hot air temperature fixing mode is in the “ON” state, the process proceeds to step # 13 and the operation in the hot air temperature fixing mode is performed.

  In step # 12, the control means 80 operates in the normal mode, that is, based on the temperature difference between the air temperature measured by the room temperature sensor 1 and the first target temperature, the total supply fuel amount range shown in Table 1 A target supply fuel amount to be supplied to the combustor 20 (that is, a proportional step number to be set) is determined from the range (that is, a range of 1 to 12 proportional stages), and the target supply fuel quantity is determined by the fuel amount adjusting means F. To supply to the combustor 20. As a result, control is performed so that the target fuel supply amount increases (that is, the number of proportional stages increases) as the temperature of the air measured by the room temperature sensor 1 is lower than the first target temperature. Thus, the control means 80 burns so that the temperature of the air sucked into the housing 10 from the suction port 70 (that is, the temperature of the indoor air in which the hot air heating device 100 is installed) becomes the first target temperature. Since the amount of fuel supplied to the container 20 is adjusted, the temperature in the room where the warm air heating device 100 is installed approaches a comfortable state for the user.

  In step # 13, the control means 80 is blown out from the outlet 72 based on the operation in the hot air temperature fixed mode, that is, based on the predicted temperature rise characteristic shown in Table 2 and the air temperature measured by the room temperature sensor 1. The target supply fuel amount to be supplied to the combustor 20 (that is, the number of proportional stages to be set) is determined from the total supply fuel amount range shown in Table 2 so that the temperature of the air to become the second target temperature. The target supply fuel amount is supplied to the combustor 20 by the fuel amount adjusting means F. For example, when the controller 80 operates in the hot air temperature fixing mode, the temperature of the air measured by the indoor temperature sensor 1 is 7 ° C., and the second target temperature in the hot air temperature fixing mode is 60 ° C. And the number of stages of the valve opening degree of the proportional valve 25 is set to “9 stages” with reference to the predicted temperature rise characteristics in Table 2. When the predicted temperature of the air blown from the outlet 72 is not the same as the second target temperature (60 ° C.), the control means 80, for example, the number of stages at which the predicted temperature closest to the second target temperature is obtained. Alternatively, the number of stages at which the closest predicted temperature is equal to or lower than the second target temperature may be selected.

  Thus, in the operation in the hot air temperature fixing mode, when the room temperature is 7 ° C., the number of stages of the valve opening of the proportional valve 25 is adjusted to 9, so that the temperature of the air blown from the outlet 72 is increased. Even if the wind temperature (second target temperature) is set to 60 ° C., for example, as shown in Table 2, the heating capacity is 3.17 kW. Considering that the heating capacity of a general electric heating device is 1.2 kW, even in the hot air temperature fixed mode, the heating capacity of about 2.5 times or more of a general electric heating device can be demonstrated. It will be. Thus, even if it is a case where it drive | operates by the warm air temperature fixed mode which considered the user's safety especially, the room in which the warm air heating apparatus 100 is installed can be heated favorably. Furthermore, since sufficient heating capability is exhibited even in the hot air temperature fixed mode, it is less necessary to use a plurality of heating devices, air conditioning devices, and the like, so that the running cost can be reduced.

  Next, in step # 14, the control means 80 determines whether or not the operation / stop switch S6 has been “turned off”. If the “cut” operation has not been performed, the control means 80 returns to step # 11 to perform the “turn off” operation. If so, the operation of the hot air heater 100 is stopped.

  As described above, the hot air heating apparatus 100 according to the present embodiment does not include a temperature sensor or the like for measuring the temperature of the air blown from the outlet 72, but the air sucked into the housing 10 from the inlet 70. The operation in the hot air temperature fixing mode in which the temperature of the air blown out from the air outlet 72 is set to the second target temperature using the indoor temperature sensor 1 that measures the temperature can be executed by switching to the normal mode.

Second Embodiment
The warm air heating device of the second embodiment is different from the first embodiment in that the user can change the setting of the second target temperature in the warm air temperature fixing mode. Although the hot air heating apparatus of 2nd Embodiment is demonstrated below, description is abbreviate | omitted about the structure similar to 1st Embodiment.

  In the present embodiment, when the hot air temperature fixing mode switch S4 is “on”, the control means 80 displays “SF” on the set room temperature display unit 57 and the second target on the current room temperature display unit 58. Display the current temperature setting. The user can recognize that the operation in the hot air temperature fixed mode is performed by looking at “SF (abbreviation of Soft)” displayed on the set room temperature display unit 57, and the current room temperature display unit 58 The current set value of the second target temperature (that is, the temperature of the air blown out from the air outlet 72) can be recognized by looking at the displayed numerical value.

  FIG. 6 is a diagram illustrating a transition example of the second target temperature displayed on the set room temperature display unit 57 of the second embodiment. In this example, the user can set a desired temperature as the second target temperature from among three temperatures of 60 ° C., 55 ° C., and 50 ° C. This setting change is performed one step at a time each time the user presses the upper switch S5a and the lower switch S5b of the temperature / time setting switch S5 while “SF” is displayed on the setting room temperature display 57. Is called. As described above, the temperature / time setting switch S5 of the driving operation reception unit 50 is configured to receive an instruction for changing the second target temperature from the user. And the control means 80 memorize | stores the 2nd target temperature set by the user.

  FIG. 7 is a flowchart for explaining the heating operation of the second embodiment. Step # 20 to step # 22 and step # 24 to step # 25 in the flowchart shown in FIG. 7 are the same as step # 10 to step # 14 shown in FIG.

  When the operation / stop switch is “turned on”, the control unit 80 proceeds to step # 20 and performs an operation start process. The content of this operation start process is the same as the content described in step # 10 of FIG. 5 of the first embodiment. Next, in step # 21, the control unit 80 determines whether or not the hot air temperature fixing mode is in the “ON” state. If the hot air temperature fixing mode is not in the “ON” state, the control unit 80 proceeds to step # 22. When the operation in the normal mode is performed and the hot air temperature fixing mode is in the “ON” state, the process proceeds to step # 23.

  In step # 22, the control means 80 operates in the normal mode, that is, based on the temperature difference between the air temperature measured by the room temperature sensor 1 and the first target temperature, the total supply fuel amount range illustrated in Table 1 A target supply fuel amount to be supplied to the combustor 20 (that is, a proportional step number to be set) is determined from the range (that is, a range of 1 to 12 proportional stages), and the target supply fuel quantity is determined by the fuel amount adjusting means F. To supply to the combustor 20.

  In step # 23, the control means 80 reads the set value of the second target temperature stored therein, that is, the second target temperature set by the user as described with reference to FIG. 2 Determine how many times the target temperature is. Then, in step # 24, the control means 80 operates from the air outlet 72 on the basis of the operation in the hot air temperature fixed mode, that is, the predicted temperature rise characteristics shown in Table 2 and the air temperature measured by the room temperature sensor 1. Target supply fuel amount supplied to the combustor 20 from the total supply fuel amount range shown in Tables 1 and 2 (that is, the set number of proportional stages) so that the temperature of the blown air becomes the second target temperature. And the target fuel supply amount is supplied to the combustor 20 by the fuel amount adjusting means F.

  As described above, in the present embodiment, since the user can change the setting of the second target temperature, the temperature of the air blown out from the air outlet 72 (second target temperature) can be set to a temperature preferable for the user.

<Third Embodiment>
The warm air heating device of the third embodiment is different from the above embodiment in that the warm air temperature fixing mode switch S4 is not provided. Although the hot air heating apparatus of 3rd Embodiment is demonstrated below, description is abbreviate | omitted about the structure similar to the said embodiment.

  FIG. 8 is a diagram illustrating a configuration example of the driving operation reception unit of the third embodiment. As shown in FIG. 8, in the present embodiment, the warm air temperature fixing mode switch S <b> 4 provided in the above embodiment is not provided in the driving operation reception unit 50. Instead, in the present embodiment, the temperature / time setting switch S5 is used to accept the execution and stop of the operation in the hot air temperature fixing mode (second heating operation mode) from the user.

  FIG. 9 is a diagram illustrating a transition example of information displayed on the set room temperature display unit and the current room temperature display unit according to the third embodiment. In this example, the user has 12 to 26 ° C. as the first target temperature in the normal mode and 60 ° C. and 55 ° C. as the second target temperature at a stage below the “L” state and the “H” state. , Three temperatures of 50 ° C. are provided. When the control unit 80 displays the first target temperature in the normal mode on the set room temperature display unit 57, the current room temperature display unit 58 displays the current room temperature measured by the room temperature sensor 1 (“7 ° C. in FIG. 9). ”) Is displayed. Further, when the control unit 80 displays the second target temperature in the hot air temperature fixing mode on the current room temperature display unit 58, the control unit 80 displays “SF (abbreviation of Soft)” on the set room temperature display unit 57. The user can recognize that the operation in the hot air temperature fixed mode is performed by looking at “SF (abbreviation of Soft)” displayed on the set room temperature display unit 57, and the current room temperature display unit 58 The set value of the second target temperature (that is, the temperature of the air blown out from the air outlet 72) can be recognized by looking at the displayed numerical value.

  Each time the temperature / time setting switch S5 (corresponding to the “temperature setting switch” of the present invention) included in the driving operation reception unit 50 is pushed by the user, a plurality of temperature values as the first target temperature and Two temperature values including at least one temperature value as the two target temperatures are sequentially set and changed. Specifically, when “L”, which is the setting for the normal mode, is displayed on the set room temperature display portion 57, when the downward switch S5b is further pressed, “60 ° C. for the hot air temperature fixing mode”. The display switches to the setting “”. When the temperature value as the first target temperature is set by the temperature / time setting switch S5 (that is, when the first target temperature is displayed on the set room temperature display unit 57), the control unit 80 When it is determined that the driving operation receiving unit 50 serving as the driving instruction receiving unit has received an instruction to execute driving in the normal mode, and the temperature value as the second target temperature is set by the temperature / time setting switch S5. (In other words, when “SF” is displayed on the set room temperature display unit 57 and the second target temperature is currently displayed on the room temperature display unit 58), the driving operation receiving unit 50 serving as the driving instruction receiving unit fixes the hot air temperature. It is determined that the operation execution instruction in the mode is accepted.

  Thus, the temperature / time setting switch S5 is normally pressed to a plurality of temperature values (H, 26 ° C., 25 ° C.,..., 13 ° C., 12 ° C., L) as the first target temperature. Each time the setting is changed sequentially, a change order is determined, and each time the temperature / time setting switch S5 is normally pushed, one temperature value as the first target temperature is changed to another one as the first target temperature. The setting is sequentially changed to the temperature value. Further, a plurality of temperature values (60 ° C., 55 ° C., 50 ° C.) as the second target temperature have a change order when the setting is sequentially changed every time the temperature / time setting switch S5 is normally pressed. Each time the temperature / time setting switch S5 is normally pushed, the setting is sequentially changed from one temperature value as the second target temperature to another temperature value as the second target temperature. Further, there is one first boundary temperature value (L) among the plurality of temperature values as the first target temperature, and one second boundary temperature value (60 among the plurality of temperature values as the second target temperature. ) And the lower switch S5b of the temperature / time setting switch S5 is normally pressed after the temperature is changed from one temperature value as the first target temperature to the temperature value (L) which is the first boundary temperature value. Then, the setting is changed to the second boundary temperature value (60 ° C.). Furthermore, after the setting is changed from one temperature value as the second target temperature to the temperature value (60 ° C.) that is the second boundary temperature value, the upward switch S5a of the temperature / time setting switch S5 is normally pressed. Then, the setting is changed to the first boundary temperature value (L).

As described above, every time the user presses the temperature / time setting switch S5, a temperature value group including a plurality of temperature values as the first target temperature and at least one temperature value as the second target temperature. Any one of the temperature values is sequentially changed. That is, the first target temperature for the normal mode (first heating operation mode) and the second target temperature for the hot air temperature fixed mode (second heating operation mode) are set using one temperature / time setting switch S5. Therefore, it is not necessary to separately mount a switch for setting the first target temperature and a switch for setting the second target temperature in the hot air heating apparatus 100.
In addition, the control means 80 determines that the operation in the normal mode (first heating operation mode) is instructed when the temperature value as the first target temperature is set by the temperature / time setting switch S5. When the temperature value as the second target temperature is set by the temperature / time setting switch S5, it is determined that the operation of the operation in the hot air temperature fixing mode (second heating operation mode) is instructed. A switch for instructing the operation in the normal mode by the user and a switch for instructing the operation in the hot air temperature fixed mode may not be separately installed in the hot air heating apparatus 100.

<Fourth embodiment>
The warm air heating device of the fourth embodiment is different from the above embodiment in that it is determined whether or not the temperature lowering process is performed before the operation in the warm air temperature fixed mode is started. Although the hot air heating apparatus of 4th Embodiment is demonstrated below, description is abbreviate | omitted about the structure similar to the said embodiment.

  FIG. 10 is a flowchart illustrating the heating operation of the fourth embodiment. Step # 30 to step # 32 and step # 35 to step # 36 in the flowchart shown in FIG. 10 are the same as step # 10 to step # 14 shown in FIG.

If the state in which the relatively high temperature air is blown out from the air outlet 72 during the operation in the normal mode continues for a predetermined period or longer, the parts of the air outlet 72 that have been continuously touching the high temperature air are also included. It is likely that the temperature is high. For example, if combustion is performed with the valve opening of the proportional valve 25 adjusted to 12 stages in Table 2, the hot air temperature at the outlet 72 is about 71 ° C. when the room temperature is 7 ° C., and the room temperature is 22 At ℃, the temperature is as high as 86 ℃. Therefore, at the time of switching from the operation in the normal mode to the operation in the hot air temperature fixed mode, there is a possibility that the parts of the air outlet 72 are still at a high temperature. Then, the user approaches the air outlet 72 and intends to suppress the temperature of the air blown out from the air outlet 72 in the hot air temperature fixed mode to a relatively low temperature (second target temperature). If the part 72 is touched, there is a possibility that the part of the air outlet 72 that is still hot will burn.
Therefore, as will be described later, when the control unit 80 is operating in the normal mode, when the hot air temperature fixing mode switch S4 of the driving operation receiving unit 50 receives an instruction to execute the operation in the hot air temperature fixing mode, If the state in which the relatively high temperature air is blown from the air outlet 72 during the operation in the mode continues for a predetermined period or longer, the state in which the temperature of the air blown from the air outlet 72 is relatively low is constant. After performing the temperature reduction process to continue for a period, the operation in the hot air temperature fixed mode is started.

  Specifically, first, when the operation / stop switch S6 is “turned on”, the control unit 80 proceeds to step # 30 and performs an operation start process. The content of this operation start process is the same as the content described in step # 10 of FIG. 5 of the first embodiment. Next, in step # 31, the control unit 80 determines whether or not the hot air temperature fixing mode is in the “ON” state. If the hot air temperature fixing mode is not in the “ON” state, the control unit 80 proceeds to step # 32. When the operation is performed in the normal mode and the hot air temperature fixing mode is in the “ON” state, the process proceeds to step # 33.

  In step # 32, the control means 80 operates in the normal mode, that is, based on the temperature difference between the air temperature measured by the room temperature sensor 1 and the first target temperature, the total supply fuel amount range illustrated in Table 1 A target supply fuel amount to be supplied to the combustor 20 (that is, a proportional step number to be set) is determined from the range (that is, a range of 1 to 12 proportional stages), and the target supply fuel quantity is determined by the fuel amount adjusting means F. To supply to the combustor 20.

  In step # 33, the control means 80 relatively moves from the air outlet 72 during operation in the normal mode for a predetermined period or longer (for example, 1 minute or longer) before the hot air temperature fixing mode becomes the “ON” state. It is determined whether or not the state in which air of high temperature (for example, temperature exceeding the second target temperature) is blown out has continued. Specifically, the control unit 80 stores the number of stages shown in Table 2 that the valve opening of the proportional valve 25 has been adjusted for a predetermined period in the past (for example, 1 minute or more). . As a result, the control means 80 detects the indoor temperature (the temperature of the air sucked into the housing 10 from the suction port 70) measured by the indoor temperature sensor 1 during the past predetermined period or longer (for example, 1 minute or longer). Based on the predicted temperature rise characteristics shown in Table 2, the temperature of the air blown out from the air outlet 72 can be derived.

  And the control means 80 blows off air of relatively high temperature (for example, temperature exceeding 2nd target temperature) from the blower outlet 72 during driving | operation in normal mode for more than the past predetermined period (for example, 1 minute or more). If the state to be performed is not continued, the process proceeds to step # 35. On the other hand, the control means 80 has a relatively high temperature (for example, a temperature exceeding the second target temperature) from the air outlet 72 during operation in the normal mode for a past predetermined period or longer (for example, 1 minute or longer). If the state where the air is blown out continues, the process proceeds to step # 34.

  In step # 34, the control means 80 executes a temperature lowering process that continues the state in which the temperature of the air blown from the blower outlet 72 is relatively low for a certain period. For example, the control means 80 adjusts the valve opening degree of the proportional valve 25 so that the temperature of the air blown out from the blowout port 72 is at least lower than the second target temperature, and a certain period (for example, 1 minute 30 seconds) ) Drive continuously. Alternatively, the control unit 80 performs the temperature reduction process in a state where the fuel supply to the combustor 20 is cut off by the fuel amount adjusting unit F. At this time, the control means 80 operates the convection fan 40 so that air is continuously blown out from the outlet 72.

  Thereafter, in step # 35, the control means 80 operates from the air outlet 72 on the basis of the operation in the hot air temperature fixed mode, that is, the predicted temperature rise characteristic shown in Table 2 and the temperature of the air measured by the room temperature sensor 1. Target supply fuel amount supplied to the combustor 20 from the total supply fuel amount range shown in Tables 1 and 2 (that is, the set number of proportional stages) so that the temperature of the blown air becomes the second target temperature. And the target fuel supply amount is supplied to the combustor 20 by the fuel amount adjusting means F.

  Next, in step # 36, the control means 80 determines whether or not the operation / stop switch S6 has been "turned off". If not, the control means 80 returns to step # 31 and is turned "off". If so, the operation of the hot air heater 100 is stopped.

  As described above, in the present embodiment, the temperature of the parts of the air outlet 72 is lowered by causing relatively low-temperature air to contact the parts of the air outlet 72 during the temperature reduction process. be able to. As a result, even when the user approaches the air outlet 72 and touches the parts of the air outlet 72 during operation in the hot air temperature fixed mode, there is no possibility of being burned.

<Another embodiment>
<1>
In the above embodiment, the configuration of the hot air heating device 100 has been described with a specific example, but the configuration can be changed as appropriate. For example, although the example in which the proportional valve 25 has 12 proportional stages has been described, a proportional valve 25 having more or less than 12 proportional stages may be used. In addition, although the example in which the proportional valve 25 is a step proportional valve that changes the valve opening corresponding to the amount of fuel supplied to the combustor 20 in a stepwise manner has been described, it corresponds to the amount of fuel supplied to the combustor 20. It is also possible to use a stepless proportional valve that continuously changes the valve opening.

<2>
In the above embodiment, the first target temperature in the normal mode (first heating operation mode), the second target temperature in the hot air temperature fixing mode (second heating operation mode), and the like have been described with specific numerical values. However, these numerical values can be changed as appropriate. In Tables 1 and 2, the relationship between the proportional step number of the valve opening of the proportional valve 25 and the heating output and the relationship between the proportional step number and the predicted rise temperature have been described with specific numerical values. These numerical values can also be changed as appropriate.
Moreover, in 2nd Embodiment, although the example which has three temperature values, 60 degreeC, 55 degreeC, and 50 degreeC as 2nd target temperature was demonstrated, 2nd target temperature has 2 or 4 or more temperature values. It can also be configured as follows.

<3>
You may correct | amend the relationship between the fuel supply amount (the number of steps of the valve opening degree of the proportional valve 25) and the predicted rising temperature in the predicted temperature rise characteristics shown in Table 2 as necessary.
For example, if the air normally flows through the passage of air inside the housing 10, fresh air at an appropriate flow rate is continuously supplied to the inside of the housing 10, so the temperature inside the housing 10 is It will not rise excessively. However, for example, if dust or the like adheres to the air filter 71 of the suction port 70 of the housing 10, the air flow inside the housing 10 becomes worse. And since only a smaller amount of air than the amount of air necessary for the amount of fuel to be combusted can be supplied to the combustor 20, the temperature of the air blown out from the outlet 72 also rises. As a result, even if an attempt is made to set the temperature of the air blown from the blower outlet 72 to the second target temperature in the operation in the hot air temperature fixed mode, the temperature of the air actually blown from the blower outlet 72 is the second target temperature. May be significantly higher.

  In view of such a problem, when the temperature measured by the in-body temperature sensor 2 (internal temperature measurement means) is equal to or higher than a predetermined normal upper limit temperature, the control means 80 is defined in the predicted temperature rise characteristics in Table 2. In the relationship between the amount of fuel supplied to the combustor 20 (the number of stages of the valve opening of the proportional valve 25) and the predicted rise temperature, a correction is made such that the amount of fuel supplied decreases relative to the predicted rise temperature (ie, , Correction is performed so that the same predicted rise temperature can be obtained with a smaller amount of supplied fuel. For example, by adding, for example, 4 ° C. to the predicted rise temperature in Table 2, the amount of supplied fuel is decreased relative to the predicted rise temperature (see Correction Example 1 in Table 3 below), Then, for example, by subtracting the proportional stage number in Table 2 by one, for example, correction (refer to Correction Example 2 in Table 4 below) for reducing the amount of supplied fuel relative to the predicted rise temperature is performed. That is, the operation in the hot air temperature fixed mode is performed in consideration of the fact that the temperature of the air actually blown out from the air outlet 72 changes to the rising side. As a result, it is possible to reduce the possibility that the temperature of the air actually blown out from the outlet 72 will be significantly higher than the second target temperature.

<4>
In the third embodiment, the transition form of the set temperature when the temperature / time setting switch S5 is pushed can be made different. For example, in the third embodiment, each time the user presses the temperature / time setting switch S5, the temperature includes a plurality of temperature values as the first target temperature and at least one temperature value as the second target temperature. The example in which any one temperature value in the value group is sequentially changed has been described. In this case, unless the temperature / time setting switch S5 is pressed many times, the state where the first target temperature is set cannot be changed to the state where the second target temperature is set. For example, in order to make a transition from a state where “26 ° C.” as the first target temperature is set to a state where “55 ° C.” as the second target temperature is set, the user sets the temperature / time. The lower switch S5b of the switch S5 has to be pressed 17 times.

  In view of such a problem, the control unit 80 distinguishes between a relatively short time pressing operation (normal pressing operation) and a relatively long time pressing operation (long pressing operation) with respect to the temperature / time setting switch S5. The second target temperature is received when the user presses the temperature / time setting switch S5 continuously for a set time or longer in a state where any one of the first target temperatures is set. The setting operation was changed to a specific temperature value in the, and the user continued to press the temperature / time setting switch S5 for a set time or longer while any one of the second target temperatures was set. When a long press operation is performed, the setting can be changed to a specific temperature value in the first target temperature.

For example, when the user presses and holds down the down switch S5b of the temperature / time setting switch S5 from the state where “26 ° C.” is set as the first target temperature, the control unit 80 sets the second target temperature to the medium. Transition to a state where “55 ° C.” as a specific temperature value is set. In contrast, when the user presses and holds the upward switch S5a of the temperature / time setting switch S5 from the state where “55 ° C.” as the second target temperature is set, the first target temperature is set. Transition is made to a state in which “26 ° C.” as a specific temperature value in the temperature is set. Here, the control means 80 stores the first target temperature (in this case, “26 ° C.”) in the normal mode at the stage of switching from the normal mode to the hot air temperature fixed mode. The first target temperature is a specific temperature value in the first target temperature.
By adopting such a configuration, it is possible to solve the problem that the user must press the temperature / time setting switch S5 many times in a configuration in which a large number of temperature values can be set.

  INDUSTRIAL APPLICABILITY The present invention can be used for a hot air heater that can adjust the temperature of hot air blown out to a desired temperature while ensuring high heating capacity.

1 Indoor temperature sensor (intake air temperature measurement means)
2 Internal temperature sensor (internal temperature measurement means)
10 Housing 20 Combustor 25 Proportional valve (Fuel amount adjusting means F)
26a First solenoid valve (fuel amount adjusting means F)
26b Second solenoid valve (fuel amount adjusting means F)
40 Convection fan (air flow means)
50 Driving operation accepting part (driving command accepting means)
S4 Hot air temperature fixed mode switch (operation mode switch)
S5 Temperature / time setting switch (temperature setting switch)
S5a Up direction switch (temperature setting switch)
S5b Down switch (Temperature setting switch)
70 Inlet 72 Outlet 80 Control means 100 Hot air heater

Claims (6)

A combustor that burns fuel, a fuel amount adjusting means that adjusts the amount of fuel supplied to the combustor, and a suction port through which air is sucked and an air outlet that blows out air, and the suction port. An air flow means for causing air to flow so that air is sucked into the casing and air is blown out from the casing through the outlet; and a control means for controlling the operation, and the suction port From the above, the air sucked into the casing is mixed with the combustion exhaust gas of the combustor to raise the temperature of the air, and the warm air heating device blows out the heated air from the outlet,
Suction air temperature measuring means for measuring the temperature of air sucked into the housing from the suction port;
Driving instruction receiving means for receiving driving instructions from the user,
The control means includes
The intake air temperature measurement is performed so that the temperature of the air measured by the intake air temperature measurement unit becomes the first target temperature when the operation instruction reception unit receives an operation execution instruction in the first heating operation mode. The target supply to be supplied to the combustor from the total supply fuel amount range between the minimum supply fuel amount and the maximum supply fuel amount based on the temperature difference between the air temperature measured by the means and the first target temperature. A fuel amount is determined, the target fuel supply amount is supplied to the combustor by the fuel amount adjusting means, and
When the operation instruction receiving means receives an operation execution instruction in the second heating operation mode, the amount of fuel supplied to the combustor and when combustion is performed with the amount of supplied fuel, the inside of the casing is Predicted temperature rise characteristics in which the relationship with the predicted rise temperature predicted to rise while the temperature of the air sucked into the air outlet is blown out from the air outlet, and the air measured by the intake air temperature measuring means A target supply fuel amount to be supplied to the combustor is determined from the total supply fuel amount range so that the temperature of the air blown from the outlet becomes a second target temperature, A target fuel supply amount is supplied to the combustor by the fuel amount adjusting means ;
The driving instruction receiving means is a temperature value group including a plurality of temperature values as the first target temperature and at least one temperature value as the second target temperature each time it is pushed by a user. It has a temperature setting switch that changes the setting of any one of the temperature values sequentially,
When the temperature value as the first target temperature is set by the temperature setting switch, the control means determines that the operation instruction reception means has received an operation execution instruction in the first heating operation mode. the operation instruction reception means is a determination to that warm-air heating accepts an execution instruction of the operation in the second heating operation mode when the temperature value of the second target temperature by the temperature setting switch is set apparatus.   The warm air heating device according to claim 1, wherein the operation instruction receiving means is configured to receive an instruction for changing the second target temperature from a user. When the operation instruction receiving means receives an operation execution instruction in the second heating operation mode during operation in the first heating operation mode, the control means performs the operation in the first heating operation mode. If the state in which relatively high-temperature air is blown out from the air outlet continues for a predetermined period or longer, the temperature lowering process continues the state in which the temperature of the air blown out from the air outlet is relatively low for a certain period. The hot air heating apparatus according to claim 1 or 2 , wherein after the operation is performed, the operation in the second heating operation mode is started. The hot air heating apparatus according to claim 3 , wherein the control means performs the temperature reduction process in a state where the fuel supply to the combustor is interrupted by the fuel amount adjusting means. An internal temperature measuring means for measuring the internal temperature of the housing;
When the temperature measured by the internal temperature measuring unit is equal to or higher than a predetermined normal upper limit temperature, the control unit calculates the amount of fuel supplied to the combustor defined by the predicted temperature rise characteristic and the predicted increased temperature. In the relationship, the hot air heating apparatus according to any one of claims 1 to 4 , wherein correction is performed such that the amount of supplied fuel is relatively decreased with respect to the predicted increase temperature. The fuel amount adjusting means has a proportional valve that changes the valve opening corresponding to the amount of fuel supplied to the combustor stepwise.
The hot air according to any one of claims 1 to 5 , wherein the control means changes the amount of fuel supplied to the combustor stepwise by changing the valve opening of the proportional valve stepwise. Heating device.

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