JP2015222141A - Hot-air heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot-air heating device capable of adjusting a temperature of supply hot air to a desired temperature while securing high heating performance.SOLUTION: In a hot-air heating device 100, an upper limit supply fuel amount to a combustor 20 is determined from a range of the whole supply fuel amounts so that a temperature of the supply air from a supply port 72 is kept at a prescribed upper limit hot-air temperature or less, on the basis of a predicted temperature rise characteristics in which a relationship between the supply fuel amount to the combustor 20 and a predicted temperature rise obtained by predicting temperature rise of the air sucked from a suction port 70 in implementing combustion with the supply fuel amount during being supplied from the supply port 72, is defined in advance, and a temperature of the suction air, a target supply fuel amount between a minimum supply fuel amount and the upper limit supply fuel amount is determined on the basis of temperature difference between the temperature of the suction air and a set target temperature, and the fuel of the target supply fuel amount is supplied to the combustor 20.

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) includes the air temperature measured by the suction air temperature measurement means (14) and the set target temperature so that the temperature of the air measured by the suction air temperature measurement means (14) becomes the target temperature. Based on the temperature difference, a target supply fuel amount to be supplied to the combustor (2) is determined, and the target supply fuel amount is supplied to the combustor (2) by the fuel amount adjusting means (7, 8, 9).

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.

  This invention is made | formed in view of said subject, The objective is the warm air heating apparatus which can adjust the temperature of the warm air blown off below desired temperature, ensuring the high heating capability. The point is to provide.

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
When the operation instruction receiving means receives an operation execution instruction in the first heating operation mode, the intake air temperature measuring means is set so that the temperature of the air measured by the intake air temperature measuring means becomes a set target temperature. The target supply fuel amount 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 engine and the set target temperature 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 The upper limit supply fuel amount to the combustor capable of setting the temperature of the air blown out from the outlet to be equal to or lower than a predetermined upper limit hot air temperature is determined from the total supply fuel amount range based on the temperature of Based on the temperature difference between the temperature of the air measured by the intake air temperature measuring means and the set target temperature so that the temperature of the air measured by the air temperature measuring means becomes the set target temperature, the minimum supply fuel amount A target supply fuel amount to be supplied to the combustor is determined from a supply fuel amount range between the upper limit supply fuel amount and the target supply fuel amount is supplied to the combustor by the fuel amount adjusting means. is there.

  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 the is installed becomes the set 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 temperature of the air that is sucked into the housing from the air inlet (for example, the temperature of the indoor air in which the hot air heater is installed) ) (Second heating operation mode) in which the amount of fuel supplied to the combustor is adjusted so that the temperature reaches the set target temperature (second heating operation mode) can be switched 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 be equal to or lower than the desired temperature without providing sensors for measuring the temperature of the air blown from the blower outlet is possible. If the amount of fuel supplied to the combustor is determined, it is predicted that the temperature of the air sucked into the housing from the suction port will rise while it is blown from the outlet when combustion is performed with the amount of fuel supplied This is based on the knowledge that the temperature rise 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 measured by the means, the upper limit supply fuel amount to the combustor capable of setting the temperature of the air blown out from the outlet to a predetermined upper limit hot air temperature or less is determined from the total supply fuel amount range, Based on the temperature difference between the air temperature measured by the intake air temperature measuring means and the set target temperature so that the air temperature measured by the intake air temperature measuring means becomes the set target temperature, Upper limit fuel supply It determines a target supply amount of fuel supplied to the combustor from the fuel supply amount range between, to supply the target fuel supply amount to the combustor by the fuel quantity adjusting means. As described above, in the second heating operation mode, the temperature of the air blown from the outlet is the upper limit while suppressing an increase in cost by using the intake air temperature measuring means also used in the operation in the first heating operation mode. The operation is performed so that the temperature is lower than the warm air temperature.

The first heating operation mode and the second heating operation mode are the air temperature measured by the intake air temperature measuring means and the set target so that the air temperature measured by the intake air temperature measuring means becomes the set target temperature. This is the same in that the target fuel amount to be supplied to the combustor is determined based on the temperature difference from the temperature, but the target fuel amount to be supplied to the combustor is the minimum fuel supply amount in the first heating operation mode. And the maximum supply fuel amount, and in the second heating operation mode, the adjustment is made between the minimum fuel amount and the upper limit supply fuel amount (≦ maximum supply fuel amount). The upper limit supply fuel amount is the amount of fuel supplied to the combustor so that the temperature of the air blown from the outlet can be made equal to or lower than a predetermined upper limit hot air temperature. As a result, in the first heating operation mode, there is no upper limit to the temperature of the air blown out from the air outlet in order to set the temperature of the air sucked into the housing from the suction port to the set target temperature, but in the second heating operation mode, The operation can be performed such that the temperature of the air blown out from the outlet is set to the upper limit hot air temperature or less.
As described above, the second heating operation mode is ensured in both the first heating operation mode and the second heating operation mode while ensuring the high heating capacity of setting the temperature of the air sucked into the housing from the suction port to the set target temperature. Then, by limiting the temperature of the hot air that is blown out to be equal to or lower than the upper limit hot air temperature, it is possible to avoid a problem that the user feels heat due to the hot air of high temperature.

  According to another characteristic configuration of the hot air heating device according to the present invention, the operation instruction receiving means includes a dedicated operation mode changeover switch for receiving execution and stop of the operation in the second heating operation mode from a user. In the point.

  According to the above characteristic configuration, by installing the dedicated operation mode changeover switch in the warm air heating device, it is easy to understand the operation required by the user when operating the warm air heating device in the second heating operation mode. Become.

  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 temperature of the air which blows off from a blower outlet is restrained to the relatively low temperature (below upper limit warm air temperature), a user approaches a blower outlet and the temperature of the blower outlet is reduced. Touching the components can cause burns at the outlet components 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 the temperature of the air blown out from the outlet is set to be equal to or lower than the upper limit hot air temperature, the temperature of the air actually blown out from the outlet is higher than the upper limit hot air temperature. May be significantly higher.
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 out from the outlet will be significantly higher than the upper limit hot air 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 flowchart explaining the heating operation of 2nd 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 set 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 accepting unit 50 is a nighttime timer switch S1, a good morning timer switch S2, an eco driving switch S3, a low temperature mode switch (driving mode changeover switch) S4, and a temperature / time as operation switches operated by a user or the like. It has a 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-operation lamp 53 that is lit during execution of eco-operation, a low-temperature mode lamp 54 that is lit during execution of low-temperature mode operation, and a filter clogged in the suction port 70 to the user. A filter cleaning lamp 55 that is turned on for notification, an operation state display lamp 56 that is turned on when the vehicle is operating, and a set room temperature display unit 57 that displays numbers, characters, symbols, and the like representing the set room temperature. And a current room temperature display unit 58 for displaying numbers, letters, 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 low temperature mode (corresponding to the “second heating operation mode” of the present invention). The operation is switched and executed in accordance with an instruction from the user. In this embodiment, if the low temperature mode switch S4, which will be described later, is not “on”, the control unit 80 determines that an instruction to execute the operation in the normal mode is received, and the low temperature mode switch S4 is “on”. If it is operated, it is determined that the execution instruction for the operation in the low temperature mode is received. That is, in this embodiment, the low temperature mode switch S4 corresponds to the “operation mode changeover switch” of the present invention.

  When the control unit 80 receives an instruction to execute the operation in the normal mode, the indoor temperature sensor 1 is controlled so that the temperature of the air measured by the indoor temperature sensor 1 as the intake air temperature measuring unit becomes the set target temperature. Based on the temperature difference between the temperature of the air to be measured and the set target temperature, the target supply fuel amount to be supplied to the combustor 20 is determined from the total supply fuel amount range between the minimum supply fuel amount and the maximum supply fuel amount. Then, 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 the 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 set 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 unit 80 displays the set 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 set 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. in 1 ° C. increments as the set target temperature in the normal mode. 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 this eco-operation mode operation, the control means 80 operates at the set target temperature for 30 minutes when the room temperature measured by the room temperature sensor 1 rises to the set target temperature while performing the operation in the normal mode. Thereafter, 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 set target temperature. The set target temperature displayed on the set room temperature display unit 57 remains the set 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 set 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 low temperature mode switch S4 is a switch for instructing execution of the second heating operation mode (low temperature mode described in the present embodiment) of the present invention. When the low temperature mode switch S4 is in the “on” operation state, the control means 80 operates the hot air heater 100 in the low temperature mode, and when the low temperature mode switch S4 is in the “off” operation state, the control means 80 80 operates the hot air heater 100 in the normal mode. As described above, the low temperature mode switch S4 functions as an operation mode switching switch for switching between the normal mode (first heating operation mode) and the low temperature mode (second heating operation mode). Thus, the low temperature mode switch S4 is a dedicated operation mode changeover switch for accepting execution and stop of the operation in the low temperature mode from the user. In this embodiment, when the user performs an “on” operation on the low temperature mode switch S4, the control means 80 switches the operation to the low temperature mode and stores that the low temperature mode switch S4 is in the “on” state. Even after is stopped, the low temperature mode switch S4 continues to memorize that it is in the “ON” state.

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 low-temperature mode switch S4 as the operation instruction receiving means receives an operation execution instruction in the low-temperature mode (second heating operation mode), the control means 80 detects the predicted temperature rise characteristic and the air measured by the room temperature sensor 1. The upper limit supply fuel amount to the combustor capable of setting the temperature of the air blown out from the outlet 72 to be equal to or lower than the predetermined upper limit hot air temperature is determined from the above-described total supply fuel amount range, Based on the temperature difference between the temperature of the air measured by the room temperature sensor 1 and the set target temperature so that the temperature of the air measured by the temperature sensor 1 becomes the set target temperature (the same as the set target temperature in the normal mode). Then, a target supply fuel amount to be supplied to the combustor 20 is determined from a supply fuel amount range between the minimum supply fuel amount and the upper limit supply fuel amount, and the target supply fuel amount is burned by the fuel amount adjusting means F. It is supplied to the vessel 20. 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 this embodiment, the upper limit hot air temperature is one temperature value (for example, 60 ° C.) stored in advance by the control means 80.

  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.

  And the control means 80 is the combustion which can make the temperature of the air which blows off from the blower outlet 72 below to predetermined | prescribed upper limit warm air temperature based on the predicted temperature rising characteristic of Table 2, and the temperature of the air which the indoor temperature sensor 1 measures. The upper limit supply fuel amount to the vessel 20 is determined from the total supply fuel amount range described above. For example, when the upper limit hot air temperature is 60 ° C. and the room temperature is 7 ° C., if the valve opening degree of the proportional valve 25 is 9 stages or less, the temperature of the air blown from the outlet 72 is the upper limit hot air temperature. (60 ° C.) or lower. Therefore, the control means 80 determines the fuel amount when the valve opening degree of the proportional valve 25 is 9 steps as the upper limit supply fuel amount to the combustor 20. Furthermore, the control means 80 is based on the temperature difference between the temperature of the air measured by the room temperature sensor 1 and the set target temperature so that the temperature of the air measured by the room temperature sensor 1 becomes the set target temperature. Combustor from within the supply fuel amount range between the minimum supply fuel amount and the upper limit supply fuel amount (in this example, the fuel amount range when the valve opening of the proportional valve 25 is in the range of 1st to 9th stages). A target supply fuel amount to be supplied to 20 (the number of stages of the opening degree of the proportional valve 25) is determined, and the target supply fuel amount is supplied to the combustor 20 by the fuel amount adjusting means F.

  As described above, the normal mode and the low temperature mode have a temperature difference between the temperature of the air measured by the room temperature sensor 1 and the set target temperature so that the temperature of the air measured by the room temperature sensor 1 becomes the set target temperature. This is the same in that the target fuel supply amount to be supplied to the combustor 20 is determined based on the difference between the minimum fuel supply amount and the maximum fuel supply amount in the normal mode. (In the example described above, the valve opening of the proportional valve 25 is adjusted between the first stage and the 12th stage), and in the low temperature mode, between the minimum fuel amount and the upper limit supply fuel amount (in the example described above, the proportional valve 25 In that the valve opening is adjusted between 1 and 9). The upper limit supply fuel amount is the amount of fuel supplied to the combustor 20 such that the temperature of the air blown from the outlet 72 can be made equal to or lower than a predetermined upper limit hot air temperature. As a result, in the normal mode, there is no upper limit to the temperature of the air blown from the outlet 72 in order to set the temperature of the air sucked into the housing 10 from the suction port 70 to the set target temperature. An operation can be performed in which the temperature of the air blown from the outlet 72 is set to the upper limit hot air temperature or less. As described above, the high heating capability of setting the temperature of the air sucked into the housing 10 from the suction port 70 to the set target temperature is ensured in both the normal mode and the low temperature mode, while the temperature blown out in the low temperature mode. By restricting the temperature of the wind to the upper limit hot air temperature or less, it is possible to avoid the problem that the user feels heat by the hot air of high temperature.

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 means 80 determines whether or not the low temperature mode is in the “on” state. If the low temperature mode is not in the “on” state, the control means 80 proceeds to step # 12 and operates in the normal mode. When the low temperature mode is in the “ON” state, the process proceeds to step # 13 and the operation in the low temperature mode is performed.

  In step # 12, the control means 80 operates in the normal mode, that is, based on the temperature difference between the temperature of the air measured by the room temperature sensor 1 and the set target temperature, the total supply fuel amount range illustrated in Table 1 ( That is, the target supply fuel amount to be supplied to the combustor 20 (that is, the proportional step number to be set) is determined from the range of the proportional stage number (1 to 12 stages), and the target supply fuel quantity is determined by the fuel amount adjusting means F. 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 set target temperature. As described above, the control means 80 is configured 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 set target temperature. Since the amount of fuel supplied to 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 operates in the low temperature mode, that is, based on the predicted temperature rise characteristics shown in Table 2 and the temperature of the air measured by the room temperature sensor 1, the air blown from the outlet 72 The upper limit supply fuel amount to the combustor 20 capable of setting the temperature below the upper limit hot air temperature is determined from the total supply fuel amount range shown in Table 2 (that is, the upper limit of the proportional stage number of the proportional valve 25 to be set is 1 The air temperature measured by the room temperature sensor 1 and the set target so that the temperature of the air measured by the room temperature sensor 1 becomes the set target temperature. Based on the temperature difference from the temperature, a target supply fuel amount to be supplied to the combustor 20 is determined from a supply fuel amount range between the minimum supply fuel amount and the upper limit supply fuel amount, and the target supply fuel amount is determined as the fuel. To the combustor 20 by the amount adjusting means F To feed. For example, when the control means 80 operates in the low temperature mode, the temperature of the air measured by the indoor temperature sensor 1 is 7 ° C., and the upper limit hot air temperature in the low temperature mode is preset to 60 ° C. For example, with reference to the predicted temperature rise characteristic in Table 2, the upper limit (upper limit supply fuel amount) of the number of stages of the valve opening of the proportional valve 25 is set to “9 stages”. And the control means 80 is based on the temperature difference of the temperature of the air which the room temperature sensor 1 measures, and the said setting target temperature so that the temperature of the air which the room temperature sensor 1 measures becomes the said setting target temperature. A target fuel supply amount (number of stages of the valve opening of the proportional valve 25) to be supplied to the combustor 20 is determined from the fuel amount range when the valve opening of the proportional valve 25 is in the range of 1 to 9; The target fuel supply amount is supplied to the combustor 20 by the fuel amount adjusting means F.

  Thus, in the operation in the low temperature mode, for example, when the room temperature is 7 ° C. and the number of stages of the valve opening of the proportional valve 25 is adjusted to 9 stages corresponding to the upper limit supply fuel amount, 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 low-temperature mode, the heating capacity is about 2.5 times or more that of a general electric heating device. . As described above, even when the operation is performed in the low temperature mode in consideration of the safety of the user, the room in which the hot air heating device 100 is installed can be favorably heated. Furthermore, since sufficient heating capability is exhibited even in the low-temperature mode, it is not 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 low temperature mode in which the temperature of the air blown from the air outlet 72 is set to be equal to or lower than the predetermined upper limit hot air 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 above embodiment in that it is determined whether or not to perform the temperature reduction process before starting the operation in the low temperature mode. Although the hot air heating apparatus of 2nd Embodiment is demonstrated below, description is abbreviate | omitted about the structure similar to the said embodiment.

  FIG. 6 is a flowchart illustrating the heating operation of the second embodiment. Step # 30 to step # 32 and step # 35 to step # 36 in the flowchart shown in FIG. 6 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 low temperature mode, there is a possibility that the parts of the air outlet 72 still remain at a high temperature. Then, the user approaches the air outlet 72 and keeps the air from the air outlet 72 in the low temperature mode so that the temperature of the air blown out from the air outlet 72 is relatively low (below the upper limit hot air temperature). If the parts are touched, there is a possibility that the parts of the air outlet 72 which is still hot will be burned.
Therefore, as will be described later, when the low temperature mode switch S4 of the driving operation accepting unit 50 receives an instruction to execute the operation in the low temperature mode during the operation in the normal mode, the control means 80 blows during the operation in the normal mode. If the state in which relatively high-temperature air is blown from the outlet 72 continues for a predetermined period or longer, the temperature lowering process that continues the state in which the temperature of the air blown from the outlet 72 is relatively low for a certain period of time. After the operation, the operation in the low temperature 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 means 80 determines whether or not the low temperature mode is in the “on” state. If the low temperature mode is not in the “on” state, the control means 80 proceeds to step # 32 and operates in the normal mode. If the low temperature 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 temperature of the air measured by the room temperature sensor 1 and the set target temperature, the total supply fuel amount range illustrated in Table 1 ( That is, the target supply fuel amount to be supplied to the combustor 20 (that is, the proportional step number to be set) is determined from the range of the proportional stage number (1 to 12 stages), and the target supply fuel quantity is determined by the fuel amount adjusting means F. Supply to the combustor 20.

  In step # 33, the control means 80 is relatively hot (for example, from the outlet 72 during operation in the normal mode for at least the past predetermined period (for example, 1 minute or more) before the low temperature mode becomes the “ON” state. It is determined whether or not the state in which the air at a temperature exceeding the upper limit hot air temperature) has been blown out continues. 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 the air of relatively high temperature (for example, temperature exceeding upper limit warm air temperature) from the blower outlet 72 during the operation in the normal mode for the past predetermined period or longer (for example, 1 minute or longer). If the state to be performed is not continued, the process proceeds to step # 35. On the other hand, the control means 80 is relatively hot (for example, a temperature exceeding the upper limit hot air temperature) from the outlet 72 during operation in the normal mode for a predetermined period or more in the past (for example, 1 minute or more). 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 upper limit hot air temperature, so that 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 blows out from the outlet 72 based on the operation in the low temperature mode, that is, based on the predicted temperature rise characteristics shown in Table 2 and the air temperature measured by the room temperature sensor 1. The upper limit supply fuel amount to the combustor 20 that can make the temperature of the air below the upper limit hot air temperature is determined from the total supply fuel amount range shown in Table 2 (that is, the upper limit of the proportional stage number of the proportional valve 25 to be set is determined) The air temperature measured by the indoor temperature sensor 1 and the above described temperature are determined so that the temperature of the air measured by the indoor temperature sensor 1 becomes the set target temperature. Based on the temperature difference from the set target temperature, a target supply fuel amount to be supplied to the combustor 20 is determined from a supply fuel amount range between the minimum supply fuel amount and the upper limit supply fuel amount, and the target supply fuel amount Is burned by the fuel amount adjusting means F To supply to 20.

  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 low temperature 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 said embodiment, although the specific numerical value was given and demonstrated about the setting target temperature etc. of normal mode (1st heating operation mode) and low temperature mode (2nd heating operation mode), those numerical values can be changed suitably. . 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.

<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, in the operation in the low temperature mode, even if the temperature of the air blown from the blower outlet 72 is set to be equal to or lower than the upper limit hot air temperature, the temperature of the air actually blown from the blower outlet 72 is higher than the upper limit hot air temperature. It can be very expensive.

  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.

  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 or less 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 Low temperature 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
When the operation instruction receiving means receives an operation execution instruction in the first heating operation mode, the intake air temperature measuring means is set so that the temperature of the air measured by the intake air temperature measuring means becomes a set target temperature. The target supply fuel amount 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 engine and the set target temperature 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 The upper limit supply fuel amount to the combustor capable of setting the temperature of the air blown out from the outlet to be equal to or lower than a predetermined upper limit hot air temperature is determined from the total supply fuel amount range based on the temperature of Based on the temperature difference between the temperature of the air measured by the intake air temperature measuring means and the set target temperature so that the temperature of the air measured by the air temperature measuring means becomes the set target temperature, the minimum supply fuel amount Hot air that determines a target supply fuel amount to be supplied to the combustor from a supply fuel amount range between the upper limit supply fuel amount and supplies the target supply fuel amount to the combustor by the fuel amount adjusting means. Heating device.   The hot air heating apparatus according to claim 1, wherein the operation instruction receiving means includes a dedicated operation mode changeover switch for receiving execution and stop of the operation in the second heating operation mode 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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