JPH04363513A - Warm-air heater - Google Patents

Abstract

PURPOSE:To control the combustion rate corresponding to the area of a room that is automatically and accurately judged to save user's trouble, and to accurately detect the room temperature not only during heating but at the time of re-ignition after an extinguishment. CONSTITUTION:An upper temperature sensor 32 is provided above a fan 11 that is located in the rear part of an apparatus main body 1 and a lower temperature sensor 33 is attached below the fan. The temperatures detected by the lower sensor 33 are indicated for five minutes after ignition, and after that, the temperatures detected by the upper sensor 32 are indicated. The area of a room is judged according to the temperature rise in five minutes after ignition, and the judgment is based on the temperatures detected by the lower temperature sensor 33. Therefore, mis-judgment does not occur even when re-ignition takes place immediately after extinguishment.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot air heater that uses a blower to send out heat generated from a heat source, and more particularly to a hot air heater that can accurately control combustion according to room temperature.

0002

[Prior Art] Conventionally, in kerosene stoves, etc.
2. Description of the Related Art Hot air heaters are known that use a blower to send out heat generated from a combustion section that includes a vaporizer, a burner, and the like. In this type of hot air heater, the indoor temperature is detected by a temperature sensor, the detected temperature is displayed on the display, and the combustion amount is controlled based on the detected temperature. ing. This combustion amount control is
Traditionally, it has been almost constant and uniform. For example, the change in heating power until reaching the set temperature set by the user, the change in heating power after reaching the set temperature, and the temporal control of these changes in heating power are controlled by various factors such as the room temperature at the start of heating and the size of the room. It was the same regardless of the conditions. The combustion amount control after reaching the set temperature is performed such that the lower the temperature detected by the temperature sensor is than the set temperature, the more the heating power is increased. However, with uniform control as described above, it may not be possible to obtain an appropriate room temperature depending on the conditions. For example, even if the heating power is the same, the degree of rise in room temperature will vary depending on the temperature at the start of heating, so if the temperature at the start of heating is high, overheating will occur. In addition, if a user moves a hot air heater from a large room to a small room and uses it, the room temperature rises relatively quickly in the small room, so if the heating power is high, the room temperature will quickly rise to the set temperature. However, even if you reduce the heat, the room temperature cannot change suddenly, resulting in overheating. On the other hand, there are hot air heaters that control the amount of combustion depending on the size of the room, but with conventional hot air heaters of this type, the user manually sets the size of the room. I'm trying to be like that. Therefore, each time the user changes the room in which the hot air heater is installed, it is necessary to set the size of the room, which is time-consuming.

[0003] Furthermore, the temperature sensor for detecting the room temperature needs to be installed at a point that represents the entire room during heating operation, but conventionally, the temperature sensor is located above the blower on the rear side of the hot air heater body. There was only one, located at The reason why the temperature sensor is placed above the blower is to accurately detect the room temperature during heating operation, but the temperature sensor placed above the blower is not suitable for use when igniting or extinguishing the air. For example, accurate temperature detection may not be possible. In other words, the upper part of the body of a hot-air heater tends to heat up more easily, but if the temperature sensor is installed above the blower, for example, if the fire is re-ignited soon after extinguishing the air, the temperature of the body of the warm-air heater will be higher. The temperature sensor is heated by the residual heat, and the temperature detected by this temperature sensor becomes higher than the actual room temperature, making it impossible to accurately detect the temperature when reigniting. This becomes especially noticeable when the blower does not provide cooling after extinguishing the fire, such as during a power outage. For example, in a hot air heater equipped with an overtemperature prevention device, when the heater is relit, it is determined that the room temperature exceeds the allowable upper limit, even though the actual room temperature requires heating. Heating operation itself may not be performed. In addition, for hot-air heaters that take a long time to generate residual heat after the operation switch is turned on, a residual heat switch is installed, and if the residual heat switch is turned on in advance and the operation switch is turned on, the ignition is made to ignite after a few seconds or instantly. However, with this type of hot air heater, the temperature detected by the temperature sensor rises above the actual room temperature due to the heat generated from the vaporizer during residual heat, making it impossible to accurately detect the room temperature. .

0004

[Problems to be Solved by the Invention] As mentioned above, in conventional hot air heaters, the combustion amount was controlled to be the same regardless of conditions such as the size of the room. The problem is that it is difficult to obtain an accurate room temperature depending on the conditions.On the other hand, even with hot air heaters that change the amount of combustion depending on the size of the room, conventionally the user has to manually set the room size. The problem was that it took a lot of time and effort. In addition, in conventional hot air heaters, the temperature sensor for detecting room temperature was installed only above the blower at the rear of the device, making it impossible to accurately detect the room temperature, especially when re-igniting after extinguishing a fire. There was a problem. The present invention aims to solve these problems, and is capable of accurately detecting the room temperature not only during heating operation but also when re-igniting after extinguishing a fire. An object of the present invention is to provide a hot air heater that can automatically and accurately control the amount of combustion.

[0005]

[Means for Solving the Problems] The hot air heater of the present invention includes:
In order to achieve the above object, there is provided a body having an inlet in the rear part and an outlet in the front part, and a ventilation passage communicating between the inlet and the outlet; a heat source provided in communication with a passageway, a blower provided in a ventilation path of the container body, an upper temperature sensor provided above the blower at a rear portion of the container body, a lower temperature sensor provided below the blower on the rear surface; a temperature display section that displays the temperature detected by these temperature sensors; and a temperature display section that displays the temperature detected by these temperature sensors; Temperature display control means for displaying the detected temperature on a temperature display section and displaying the temperature detected by the upper temperature sensor on the temperature display section after the predetermined time has elapsed, and detecting the temperature by the lower temperature sensor after the heat source starts generating heat. a room size determining means for determining the size of the room based on a change in temperature; a temperature setting means; and a room size determined by the temperature setting means and the upper temperature sensor. and a heat generation control means for controlling the amount of heat generated by the heat source based on the detected temperature.

[0006]

[Function] In the hot air heater of the present invention, during heating operation,
As the heat source generates heat, air is drawn in from the suction port and heated by the heat source through the air passage inside the container, and is blown out from the air outlet by driving the blower. The temperature detected by the temperature sensor is then displayed on the temperature display section.
The temperature detected by the lower temperature sensor located below the blower is displayed on the temperature display section until a predetermined time elapses after the heat source starts generating heat, and after the predetermined time elapses, the temperature detected by the upper temperature sensor located above the blower is displayed. The detected temperature is displayed on the temperature display section. Further, after the heat source starts generating heat, the size of the room is determined based on the change in temperature detected by the lower temperature sensor, and after that, the size of the room is determined based on the temperature set by the user using the temperature setting means and the determined room size. The amount of heat generated by the heat source is controlled based on the area and the temperature detected by the upper temperature sensor. By the way, if the heat source starts generating heat again shortly after it has stopped generating heat, the temperature detected by the upper temperature sensor may be different from the actual room temperature due to residual heat in the appliance. Rather, the temperature detected by the lower temperature sensor is closer to the actual room temperature. Therefore, as described above, if the temperature detected by the lower temperature sensor is displayed for a predetermined time after the heat source starts generating heat, more accurate temperature display can be performed. In addition, if the size of the room is determined after the heat source starts generating heat based on the temperature detected by the lower temperature sensor, the size of the room can be reliably determined. However, during heating operation, after a certain amount of time has passed after the heat source starts generating heat, the temperature detected by the upper temperature sensor will be closer to the actual room temperature than the lower temperature sensor, so the upper Preferably, a temperature sensor is used.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot air heater of the present invention will be described below with reference to FIGS. 1 to 9. In Figure 1,
Reference numeral 1 denotes a container body, and this container body 1 includes a stand 2 placed on the indoor floor, and a case-shaped outer plate 3 fixed on the stand 2.
It consists of And, on the rear surface of this outer plate 3,
An opening 4 is formed, and a blower support plate 5 is fixed so as to cover the opening 4, and a suction port 6 is formed in the blower support plate 5. Also,
An air outlet 7 is formed in the front surface of the outer panel 3, and a louver 8 is provided in the air outlet 7. Further, a blower duct 9 is fixed inside the outer panel 3 between the opening 4 and the blower outlet 7, and inside the blower duct 9 there is a blower passage communicating the suction port 6 and the blower outlet 7. 10 are formed. An electric blower 11 for convection consisting of a fan motor is installed within the blower support plate 5 and located within the air passage 10 . A combustion tube 16 is provided in the center of the vessel body 1, and a combustion section 17 serving as a heat source is provided at the lower side of the combustion tube 16.
is fixed. The inside of the combustion tube 16 covering the upper part of the combustion section 17 communicates with the air passage 10 through a hot air port 18 formed in the upper part of the combustion tube 16 and opening toward the front. Furthermore, a fixed tank 19 is attached at a position below the combustion tube 16 within the vessel body 1 . Figure 2
As shown in FIG. 1, a cartridge tank 20 is removably attached to the fixed tank 19, and kerosene, which is a liquid fuel, is appropriately supplied from the cartridge tank 20 to the fixed tank 19. The fixed tank 19 is connected to an electromagnetic pump 21 and an oil pipe 22.
It is connected to the vaporizer 23 via. This carburetor 23 has a front nozzle 24 and a rear nozzle 2.
5, and the front nozzle 24 is connected to the combustion section 1.
The rear nozzle 25 faces the combustion gas introduction port of the rear burner 27 of the combustion section 17 . Also,
The carburetor 23 is provided with a front solenoid valve 28 that opens and closes the front nozzle 24 and a rear solenoid valve 29 that opens and closes the rear nozzle 25. Of these, the front solenoid valve 28 is fixed via a gas vent pipe 30. It is connected to tank 19. Furthermore, as shown in FIG. 1, an ignition heater 31 is provided for the front burner 26. Further, on the outside of the rear surface of the outer panel 3 of the vessel body 1, an upper temperature sensor 32 is provided above the blower 11, and a lower temperature sensor 33 is provided below the blower 11. It is provided. Further, an electronic circuit section 34 is provided on the front side of the upper part of the outer panel 3, and an operation section and a display section 35 are provided to be exposed on the upper front side of the outer panel 3.

Next, the configuration of the electric circuit will be explained with reference to FIG. An overheating prevention thermostat 4 is installed between both poles of a plug 41 connected to a 100V commercial AC power source.
2, 43, 44, a vaporizer thermal fuse 45, a current fuse 46, a capacitor 47, and a parallel circuit of a surge absorbing element 48 are connected in series. A series circuit of a triac 49 and a vaporizer heater 50 is connected between the two pole positions (points a and b) of the capacitor 47. A series circuit of a resistor 51 and a capacitor 52 is connected in parallel to the triac 49. Also, the gate of triac 49 and the triac 49
A series circuit including a phototriac 53 and a resistor 54 is connected between the intermediate point of the vaporizer heater 50 and the intermediate point of the vaporizer heater 50 . Also, between the points a and b, there is a relay contact 5.
5 and 56 are connected to a series circuit of a rectifier circuit 57 and a resistor 58, and the rear solenoid valve 29 is connected between the output terminals of the rectifier circuit 57. Further, a rectifier circuit 61 and a resistor 62 are connected in series between the intermediate point between the relay contacts 55 and 56 and the point b, and the front solenoid valve 28 is connected between the output end of the rectifier circuit 61. is connected. Further, a series circuit including a relay contact 63, the ignition heater 31, and a relay contact 64 is connected between the point a and the intermediate point between the rectifier circuit 61 and the resistor 58. A relay contact 65 is connected between the intermediate point of the contact 64 and the intermediate point of the rectifier circuit 61 and the resistor 62. Further, between the point a and the point b, the blower 11 and the resistor 6 are connected.
6 and triac 67 parallel circuit and capacitor 6
8 and a resistor 69 are connected in series, and a series circuit of a capacitor 70 and a resistor 71 is connected in parallel to the triac 67. A phototriac 72 is connected between the midpoint between the blower 11 and the triac 67 and the gate of the triac 67. In addition, the triac 67 and the capacitor 6
A relay contact 73 is connected between the intermediate point of 8 and the relay contact 65 and point b. Furthermore, the point a and b
A control section 74 consisting of a microcomputer or the like is connected between the point and the point. This control section 74 includes a vaporizer thermistor 75, the upper temperature sensor 32 made of a thermistor, the lower temperature sensor 33 made of a thermistor, the electromagnetic pump 21, and the anti-seismic automatic fire extinguishing device 7.
6, a detector 77, a frame rod 78, the operation section and the display section 35 are connected, and an operation switch 79 is connected thereto. Although not shown, the control unit 74 also includes the relay contacts 55, 56, 63,
A relay coil for opening and closing 64, 65, 73,
The photo triacs 53, 72 and photo-coupled photo diodes are also connected. The operation section and display section 35 include a temperature display section 81 (shown in FIG. 4) that displays the temperature detected by the upper temperature sensor 32 or the lower temperature sensor 33 as room temperature, and a temperature display section 81 (shown in FIG. 4) that allows the user to set the desired room temperature. Temperature setting means 82 for
(shown in FIG. 4). In addition, as a software function, the control section 74 including the microcomputer etc. controls the lower temperature sensor 3 until a predetermined period of time elapses after ignition (the start of heat generation from the heat source), as shown in FIG.
temperature display control means 83 for displaying the temperature detected by the upper temperature sensor 32 on the temperature display section 81 and displaying the temperature detected by the upper temperature sensor 32 on the temperature display section 81 after the predetermined time elapses; Room size determination means 84 determines the size of the room based on the change in temperature detected by the lower temperature sensor 32 during this period, and It has combustion control means 85 which is a heat generation control means for controlling thermal power (calorific value of the heat source) based on the size and the temperature detected by the upper temperature sensor 32.

Next, the operation of the above structure will be explained. During heating operation, kerosene is sent from the fixed tank 19 to the vaporizer 23 by the electromagnetic pump 21.
It is vaporized by heating by the vaporizer heater 50. Combustion gas, which is a mixture of vaporized kerosene and air, is supplied from nozzles 24 and 25 to burners 26 and 27, and is ignited by an ignition heater 31 and burned. In addition, by driving the electric blower 11, air is sucked into the container body 1 through the suction port 6.
Air heated by the burners 26 and 27 passes through the air passage 10 inside and blows out from the outlet 7. Next, an outline of the operation of the electric circuit will be explained. The resistance values of the vaporizer thermistor 75, the upper temperature sensor 32, and the lower temperature sensor 33 each consisting of a thermistor change depending on the ambient temperature, and a signal corresponding to this resistance value is sent to the control unit 74, which controls the The unit 74 converts the sent signal into temperature and performs calculations for controlling the heater 50, electromagnetic pump 21, and blower 11. The amount of heat generated by the vaporizer heater 50 that vaporizes kerosene is controlled by the phase control of the triac 49. In this phase control, the amount of heat generated is output from the control unit 74 in response to a signal from the vaporizer thermistor 75, etc. Photo triac 53 by trigger signal
The triac 49 is triggered via. In addition, the relay contact 5 is
5, 56, 63, 64, 65, 73 are controlled to open and close,
The opening and closing of the solenoid valves 28 and 29 are controlled, and the ignition heater 31 is controlled to be energized and disconnected. Further, the speed of the blower 11 is controlled by phase control of the triac 67, but in this phase control, the temperature sensor 32
, 33, the triac 67 is triggered via the phototriac 72 by a trigger signal output from the control section 74. Further, in the electromagnetic pump 21, the amount of oil sent from the fixed tank 19 to the vaporizer 23 is controlled by frequency control by a control unit 74 in accordance with signals from temperature sensors 32, 33, etc. Note that the thermal power is determined according to the amount of oil fed.

Next, temperature detection and display by the temperature sensors 32 and 33 and combustion amount control will be explained in detail. The signals from the upper temperature sensor 32 and the lower temperature sensor 33 are each constantly input to the control unit 74, but this control means 74 only adopts the signal from either the upper temperature sensor 32 or the lower temperature sensor 33. , Based on this, the temperature display section displays the temperature, and
Controls combustion amount. As shown in FIG. 5, temperature display and combustion amount control are performed based on the temperature detected by the lower temperature sensor 33 after the operation switch 79 is turned on (at time α) and the room size is detected. Until completion (time point β) or from when the fire is extinguished (time point γ) to time point β, and during the heating operation from time point β to time point γ, the temperature detected by the upper temperature sensor 32 Based on this, temperature display and combustion amount control are performed. That is, as shown in the flowchart of FIG. 6, when the operation switch 79 is turned on, first, the detected temperature used for display and control is switched to the temperature detected by the lower temperature sensor 33 (step S1), and the burner 26, 2
7 is ignited (step S2). Note that combustion is performed at maximum thermal power for a predetermined period of time, for example, 5 minutes from this ignition point. Further, the temperature T0 detected by the lower temperature sensor 33 immediately after ignition is stored (step S3). After that, it is determined whether 5 minutes have passed since the ignition (
Step S4): When 5 minutes have passed, the rate of change in temperature detected by the lower temperature sensor 33 between that time and the ignition time is calculated (step S5). That is, from the temperature T1 detected by the lower temperature sensor 33 after 5 minutes and the temperature T0, the temperature increase value per unit time, that is, the rate of change R=(T1-T0)/5 is calculated. Next, the magnitude of this rate of change R is determined (steps S6, S7), and if R<1°C/min, the room size is set to be a large room (step S8), and 1°C/min≦R
<2℃/min, set the room size to medium (
Step S9), if 2°C/min≦R, the room size is set to a small room (step S10). At the same time, when 5 minutes have passed since the ignition, the detected temperature used for display and control is switched to the temperature detected by the upper temperature sensor 32 (step S11). Thereafter, combustion amount control is performed based on the room size setting and the temperature detected by the upper temperature sensor 32 (step S12). Furthermore, when the burners 26 and 27 are extinguished by the user's operation (step S13), the detected temperature used for display and control is switched to the temperature detected by the lower temperature sensor 33 (step S14).
, in preparation for the next start of operation. In addition, even after the fire is extinguished, the blower 1
1 continues driving for a while. Further, although not shown in the flowchart, from step S1 to step S1
1 and after step S14, the temperature detected by the lower temperature sensor 33 is displayed on the temperature display section 81, and from step S11 to step S14, the temperature detected by the upper temperature sensor 32 is displayed. displayed on the display. Also, as shown in Figure 7,
In the combustion amount control in step S11, the difference ΔT between the temperature Ta detected by the upper temperature sensor 32 and the set temperature Tb set by the user using the temperature setting means is determined as follows:
Tb - Ta is calculated (step S21), and this difference ΔT is determined (steps S22, S23).
). Then, if ΔT<5℃, combustion is performed with small heat (
Step S24), if 5°C≦ΔT<15°C, combustion is performed at medium thermal power (step S25), and if 15°C≦ΔT, combustion is performed at high thermal power (step S26). Next, it is determined whether a fire extinguishing operation has been performed (step S27), and if there has been no fire extinguishing operation, the process proceeds to step S2.
Return to 1. Note that these large, medium, and small thermal powers differ depending on the setting of the size of the room, and the relationship between the setting of the room size and the large, medium, and small thermal power is as shown in Table 1 below.

[0011]

[Table 1]

[0012] In Table 1, the number after P indicates the firepower, and the larger the number, the greater the firepower. This firepower is variably set in 16 stages, P16
is the maximum firepower and P1 is the minimum firepower. Note that the heat power setting immediately after 5 minutes has elapsed from ignition is performed based on the temperature detected by the lower temperature sensor 33 before that.

By the way, as the fire is extinguished, the hot air inside the container body 1 rises, and the temperature detected by the upper temperature sensor 32 rises by several degrees due to this hot air, making it different from the actual room temperature. On the other hand, the temperature detected by the lower temperature sensor 33 hardly changes. Here, changes in temperature detected by the two temperature sensors 32 and 33 after extinguishing the fire will be explained in more detail with reference to FIG. In the figure, the temperature detected by the upper temperature sensor 32 is marked with the character "upper", and the temperature detected by the lower temperature sensor 33 is marked with the character "lower". be. First, when the fire is extinguished at time A, the temperatures detected by both temperature sensors 32 and 33 decrease due to the air cooling effect of the blower 11. Thereafter, the temperature detected by the upper temperature sensor 32 is the temperature of the blower 1 at time B.
When 1 stops, the residual heat of container 1 causes the temperature to gradually rise and deviate from the actual room temperature, but after a sufficient period of time, it begins to fall again, and when it reaches point C, it becomes almost the actual room temperature. . On the other hand, the temperature detected by the lower temperature sensor 33 gradually decreases even after the blower 11 is stopped and remains at a substantially constant level. Here, a change in temperature detected by both temperature sensors 32 and 33 when re-igniting is performed between time B and time C will be described with reference to FIG. 9. In addition,
In the figure, the chain line indicates the temperature change shown in FIG. 8 above. When ignited at time D between time B and time C, the upper temperature sensor 32 is cooled by air convection in the room generated by the blower 11, and the temperature detected by the upper temperature sensor 32 first decreases. On the other hand, the temperature detected by the lower temperature sensor 33 starts to rise at the same time as the ignition because the lower temperature sensor 33 is close to the indoor floor and is naturally cold. Due to such temperature changes, if the fire is re-ignited between the above-mentioned time points B and C, and the size of the room is determined based on the temperature detected by the upper temperature sensor 32, an erroneous determination will occur. However, since the temperature detected by the lower temperature sensor 33 always rises gradually, it is not necessary to judge the size of the room based on the temperature detected by the lower temperature sensor 33 as in the above embodiment. If you do this, you will be able to make this determination accurately. Note that even during normal ignition after a sufficient period of time has elapsed after extinguishing the fire, in a hot-air heater that preheats the vaporizer 23, both temperature sensors 32, 33
Switching between both temperature sensors 32 and 33 is effective because the temperature detected by the temperature sensor shows changes almost the same as those shown in FIG. Further, at time E, when a certain period of time (2 to 7 minutes in the experiment) has elapsed from time D, the temperatures detected by both temperature sensors 32 and 33 temporarily approach each other. Therefore, at the time point E, the temperature display on the temperature display section is changed from the lower temperature sensor 32 to the upper temperature sensor 33.
By switching to , there will be almost no discontinuous changes in the temperature display, and the user will not feel any discomfort. In fact, in the embodiment described above, since the switching is performed 5 minutes after ignition, no noticeable discontinuous change occurs in the temperature display. Note that it is difficult to accurately detect the actual indoor temperature using only the lower temperature sensor 33, so the upper temperature sensor 3
2 is necessary.

As described above, according to the embodiment, the size of the room is determined based on the temperature detected by the temperature sensor 33, and the combustion amount control is switched according to the result. The combustion amount can be controlled accurately according to the installation situation, and switching is done automatically, which saves time and effort. Moreover, the size of the room can be determined by a lower temperature sensor 3 installed below the blower 11.
Since the determination is made based on the temperature detected in step 3, the size of the room can be accurately determined even if the fire is re-ignited immediately after being extinguished. This is because, as already explained, even if the fire is re-ignited immediately after being extinguished, the difference between the temperature detected by the lower temperature sensor 33 and the actual room temperature is small. On the other hand, if the only sensor that detects the room temperature is the lower temperature sensor 33, the detection of the indoor temperature during heating operation will be inaccurate, and the lower part will not get warm, but only the upper part will become warm. However, comfortable heating can be achieved by appropriately switching between the lower temperature sensor 33 and the upper temperature sensor 32, taking advantage of their respective advantages. In addition, it is possible to reduce the deviation between the displayed temperature and the actual room temperature, which tends to occur when a fire is extinguished, immediately after a fire is extinguished, or during a power outage, and accurate temperature display can be performed at all times. Further, by providing the two temperature sensors 32 and 33, the sensor position can be set as a representative point of the room temperature without considering the temperature change after extinguishing the fire, so the sensor position can be easily set in terms of design. That is, since the lower temperature sensor 33 detects the temperature after extinguishing the fire, the upper temperature sensor 32
The best position can be set as a representative point of room temperature during heating operation.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in various modifications. for example,
In the above example, the size of the room was determined in three stages, but
Of course, it is also possible to make a judgment at more than one level. In addition, in the combustion amount control, in addition to simply changing the amount of change in thermal power depending on whether the difference between the detected temperature and the set temperature is large or small, the starting point for decreasing the thermal power may be changed. Furthermore, in the embodiment, when the detection of the size of the room is completed, the temperature sensor 33 changes from the lower temperature sensor 32 to the upper temperature sensor 33.
However, after completing the detection of the room size,
When the difference between the temperatures detected by both temperature sensors 32 and 33 becomes less than the minimum resolution of temperature display, the displayed temperature may be switched from the lower temperature sensor 32 to the upper temperature sensor 33. As a result, no change occurs in the temperature display during switching.

[0016]

[Effects of the Invention] According to the present invention, the size of the room is determined based on the temperature detected by the temperature sensor, and the amount of heat generated is controlled accordingly. In addition to being able to accurately control the size of the room, the size of the room is automatically set, which saves time and effort. In addition, two temperature sensors, an upper temperature sensor and a lower temperature sensor, are provided, and the temperature detected by the lower temperature sensor is displayed for a predetermined time after the start of heat generation, and after that, the temperature detected by the upper temperature sensor is displayed. Therefore, it is possible to accurately display the temperature, even when the heat source starts generating heat again shortly after the heat source has stopped generating heat. In addition, since the size of the room is determined after the heat source starts generating heat based on the temperature detected by the lower temperature sensor, the size of the room can be reliably determined. Furthermore, during the heating operation after a certain period of time has passed after the heat source starts generating heat, the amount of heat generated is controlled based on the temperature detected by the upper temperature sensor, so this control can be performed accurately.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a hot air heater of the present invention.

FIG. 2 is a schematic explanatory diagram of the combustion section portion of the same as above.

FIG. 3 is a wiring diagram of the electric circuit same as above.

FIG. 4 is a block diagram same as above.

FIG. 5 is a graph showing the priority relationship between the upper temperature sensor and the lower temperature sensor.

FIG. 6 is a flowchart same as above.

FIG. 7 is a flowchart of combustion control same as above.

FIG. 8 is a graph showing changes in temperature detected by both temperature sensors after extinguishing the fire.

FIG. 9 is a graph showing changes in temperature detected by both temperature sensors when the fire is re-ignited after being extinguished.

[Explanation of symbols]

1　Vessel body 6 Suction port 7 Air outlet 10　Air duct 11 Electric blower (blower) 17 Combustion part (heat source) 32 Upper temperature sensor 33 Lower temperature sensor 81 Temperature display section 82 Temperature setting means 83 Temperature display control means 84 Room size determination means

Claims (1)

[Claims] 1. A container body having a suction port in a rear surface portion and an air outlet port in a front surface portion, and having a ventilation passage therein which communicates the suction port and the discharge port, and a container body that communicates with the ventilation passage within the container body. a heat source provided in the air passage of the container body; an upper temperature sensor provided above the blower in the rear portion of the container body; a lower temperature sensor provided below the blower; a temperature display section that displays the temperature detected by these temperature sensors; temperature display control means for displaying the temperature on a temperature display section and displaying the temperature detected by the upper temperature sensor on the temperature display section after the predetermined time has elapsed; and the temperature detected by the lower temperature sensor after the heat source starts generating heat. a room size determining means for determining the size of the room based on a change in the room size; a temperature setting means; and a room size determined by the temperature setting means and the temperature detected by the upper temperature sensor. and a heat generation control means for controlling the amount of heat generated by the heat source based on the temperature.