JPH09318046A - Hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce odor felt by a user when the user ignites oil by a method wherein a convection fan is stopped when the oil is ignited and a delay time from an igniting operation to a driving of the convection fan is changed in response to a temperature of a gasifying device when an operation is started. SOLUTION: As a user turns on an operation switch to start an operation of a heater device, a temperature of a gasifying device 6 is measured by a temperature sensor 9. This measured value is utilized for estimating a degree of heating within a main body of the device when its operation is started. A data table stored in ROM or the like at a control section 11 is referred in reference to this temperature and then a delay time of a convection fan 2 is fed out. With such an arrangement as above, it is possible to rotate the convection fan 2 at a timing capable of reducing odor most under a condition satisfying a standard value of hot air at a rear surface of the device. That is, in the case that the measured temperature of the gasifying device 6 is high, the delay time of the convection fan 2 is short (2 seconds), although in the case that the temperature is low, the delay time can be extended (4 seconds). Accordingly, it is possible to reduce odor felt by a user when the user feels when the user ignites oil.

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 which burns vaporized liquid fuel to release hot air.

[0002]

2. Description of the Related Art Conventional hot-air heaters that burn vaporized liquid fuel of this kind and emit warm air generate a considerable amount of odor such as unburned residue during ignition. FIG. 7 is a sectional view of a main part of a conventional warm air heater. In FIG. 7, 1 is a burner that burns vaporized liquid fuel, 2 is a convection fan that discharges warm air generated by the burner 1, 3 is a combustion cylinder that forms a space over the burner 1 in which flame can be formed, and 4 is hot air blowing. Outlet,
5 is an air suction port.

Next, the operation will be described. When combustion is started, a flame is formed in the burner 1, and the high temperature gas generated by this flame rises in the combustion cylinder 3 and comes out.
This high-temperature gas is pushed out by the rotation of the convection fan 2 together with the air sucked from the air suction port 5 to the front surface, and is discharged from the warm air blowing port 4 to be used for indoor heating. By the way, odor components such as unburned residue generated during ignition operation are
Since the hot air is discharged from the hot air outlet 4 in the form of being pushed out by the high temperature gas, the odor is directly blown to the user.

As a measure against the odor at the time of ignition, there is a method of stopping the convection fan 2 for a certain period of time during the ignition operation. FIG. 8 is a cross-sectional view of the main parts of this type of hot air heater. When combustion is started, the high temperature gas generated by the flame formed in the burner 1 rises in the combustion cylinder 3 and escapes. At this time, since the convection fan 2 is stopped, there is no forced flow of air. This high-temperature gas is discharged and diffused by natural convection from the air suction port 5 located at a position higher than the hot air outlet 4. After that, when a delay time determined in advance by a timer or the like elapses, the convection fan 2 rotates, and
The hot air is discharged from the hot air outlet 4 in a flow like the above and is used for heating the room. That is, the odor component generated during the ignition operation is discharged together with the high-temperature gas to the rear surface having the air suction port 5 and diffused, so that the odor component is not directly blown to the user on the front surface.

Further, there is a system in which an ignition detection signal is used for the delay time from the start of the ignition operation to the driving of the convection fan 2 instead of a fixed value determined by a timer or the like. Ignition detection is generally confirmed later than flame formation. Therefore, the method of driving the convection fan 2 after the detection of ignition has the same effect as the method using the timer or the like, and can surely obtain the odor reduction effect even when the flame formation is delayed due to vaporization delay or the like. You can

FIG. 9 is an explanatory diagram showing how the odor concentration decreases due to the delay time of the convection fan 2. When the convection fan 2 is rotating before the ignition operation, the odorous component is diluted and the concentration is slightly reduced. On the other hand, when the convection fan 2 is rotated immediately after the ignition operation, the odor concentration becomes highest. This is because the odorous components are pushed out at once.
After that, the odor concentration decreases as the delay time of the convection fan 2 increases, and the odor felt by the user in front decreases.

FIG. 10 is an explanatory view showing how the backside hot air temperature rises due to the delay time of the convection fan 2. The backside hot air temperature tends to increase as the delay time of the convection fan 2 increases. Furthermore, it is also affected by how warm the inside of the main unit is. Compared to the case where the main body starts operation when it is cold (cold start), the back hot air temperature is higher when the main body starts operating when it is warm (hot start) when it is used immediately before (hot start) The rate of increase of will be faster.

[0008]

Since the conventional warm air heater is constructed as described above, the high temperature gas discharged from the rear surface of the main body while the convection fan 2 is stopped is at the standard value (110 ° C.). ) It is necessary to drive the convection fan 2 before the temperature reaches the above temperature, and if a fixed value is set for the delay time of the convection fan 2 and the standard value of the backside hot air temperature is satisfied, the timing at which the odor concentration becomes lower is always There is a problem that it cannot be used effectively.

Further, in the method using the ignition detection, the detection circuit is easily affected, and if the detection is delayed due to the failure of the detection circuit or the ignition of the red flame, the driving timing of the convection fan 2 is also delayed, and the standard of the rear hot air temperature is specified. There is a problem that the value cannot be satisfied.

The present invention has been made to solve the above problems, and an object thereof is to obtain a warm air heater capable of reducing the odor felt by the user during ignition.

[0011]

In the warm air heater according to the present invention, the convection fan is stopped at the time of ignition, and the delay time from the start of the ignition operation to the driving of the convection fan depends on the temperature of the carburetor at the start of operation. It is configured to change.

Further, the warm air heater according to the present invention has the above-mentioned structure and is further provided with a heat shield plate above the air suction port.

Furthermore, the warm air heater according to the present invention has the above-mentioned structure, and the heat shield plate is further provided with a deodorizing function of activated carbon or the like.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. First Embodiment FIG. 1 is a configuration diagram of a warm air heater showing a first embodiment of the present invention. The same parts as those of the conventional example shown in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, 6 is a vaporizer for supplying vaporized liquid fuel to the burner 1, 7 is a fuel pump for supplying liquid fuel to the vaporizer 6, 8 is a vaporization heater built in the vaporizer 6, and 9 is a vaporization heater. A temperature sensor for detecting the temperature of the vaporizer 6,
Reference numeral 10 is an igniter that ignites the burner 1 at the time of ignition, and 11 is a control unit that controls the convection fan 2, the fuel pump 7, the vaporization heater 8, and the igniter 10 to control combustion in the burner 1.

FIG. 2 is a flow chart showing the operation of the first embodiment. When the user turns on the operation switch (not shown) to start the operation, the temperature sensor 9 first measures the temperature of the carburetor 6 (step 2).
0). This measured value is used to estimate the degree of warming inside the main body at the start of operation. From this temperature, the delay time of the convection fan 2 is derived by referring to the data table stored in advance in the ROM or the like provided in the control section 11 (step 21) (step 22). As a result, the convection fan 2 can be rotated at the timing at which the odor can be most reduced under the condition that the back surface hot air standard value is satisfied. That is, when the temperature of the vaporizer 6 measured in step 20 is high (90 ° C. or higher), the delay time of the convection fan 2 is short (2 seconds), but conversely, when the temperature is low (less than 90 ° C.), the delay is delayed. The time can be lengthened (4 seconds) and the odor can be significantly reduced.

Thereafter, the control of the vaporizer heater 8 is started so as to keep the temperature of the vaporizer 6 within the combustible temperature range (200 to 300 ° C.) (step 23). Since the ignition operation is not performed, the ignition operation completed flag is 0 (step 24). Then, when the vaporizer 6 reaches a predetermined temperature (200 ° C.) or higher, ignition is possible (step 25). Igniter 10
After activating (step 26), the fuel pump 7 starts supplying the liquid fuel (step 27). The liquid fuel is vaporized in the vaporizer 6 and supplied to the burner 1 to ignite and form a flame. Thereafter, the ignition operation is continued until ignition is detected, and when ignition is confirmed (step 28), the ignition operation completed flag is set to 1 (step 29), and the igniter 1
0 is turned off (step 30).

On the other hand, the convection fan 2 remains stopped (step 31) until the delay time derived in the previous step 22 elapses, and the unburned residue generated during ignition on the flow of the high temperature gas shown in FIG. Odor components such as are discharged to the back of the main unit and diffused. After that, when the delay time elapses, the convection fan 2 starts rotating (step 32), the high temperature gas is discharged from the warm air outlet 4 along with the flow of the warm air shown in FIG. 7, and is used for heating the room. .

FIG. 3 is a time chart at the hot start in the first embodiment. The operation follows the above flow chart. Since the temperature of the vaporizer 6 at the start of operation is 100 ° C. (hot start), the delay time for driving the convection fan 2 is set to 2 seconds. Then, when the vaporization heater 8 is energized and the temperature of the vaporizer 6 reaches the combustible temperature (200 ° C.), the fuel pump 7 starts supplying the liquid fuel and ignites after operating the igniter 10. Then, when the previously determined delay time elapses, the convection fan 2 starts to rotate. When a fixed value is used for the delay time as in the conventional warm air heater, the delay time cannot be increased any further.

FIG. 4 is a time chart at the cold start in the first embodiment. The operation is the same as that of the time chart 3 and thus is omitted, but since the temperature of the carburetor 6 at the start of operation is 25 ° C. (cold start), the delay time for driving the convection fan 2 is set to 4 seconds. As a result, it is possible to drive the convection fan 2 with a delay time that could not be realized in the past, and it is possible to utilize the place where the odor concentration is significantly low as shown in FIG. Especially during normal use, this cold start is more frequent.

As described above, in the first embodiment, the convection fan 2 is stopped at the time of ignition, and the delay from the start of the ignition operation until the convection fan 2 is driven according to the temperature of the carburetor 6 at the start of operation. Since the time is changed, the odor at the time of ignition can be reduced for the user under a wider condition while satisfying safety aspects such as the standard value of the backside hot air temperature.

Embodiment 2 FIG. FIG. 5 is a sectional view of a main part of a warm air heater according to a second embodiment of the present invention. In FIG. 5, reference numeral 12 is a heat shield plate provided above the air suction port 5 of the convection fan 2. The operation of this warm air heater is the same as that of the first embodiment. When the convection fan 2 is stopped, high-temperature gas is discharged from the air suction port 5, but the hot air exhausted to the back side by the heat shield plate 12 is obstructed, and as a result, the degree of rise in the back side hot air temperature decreases, and the convection fan 2 The delay time can be extended.

As described above, in the second embodiment, the convection fan 2 is stopped at the time of ignition, and the delay from the start of the ignition operation to the driving of the convection fan 2 is started according to the temperature of the carburetor 6 at the start of the operation. Since the heat shield plate 12 is provided above the air intake port 5 of the convection fan 2 while changing the time, the user can ignite a wider range of conditions while satisfying safety aspects such as the standard value of the backside hot air temperature. The odor at the time can be reduced.

Embodiment 3. FIG. 6 is a sectional view of a main part of a warm air heater according to a third embodiment of the present invention. In FIG. 6, reference numeral 12 is a heat shield plate provided above the air suction port 5 of the convection fan 2, and has a ventilation port 12a. Thirteen
Is a deodorizing device attached to the heat shield plate 12, and uses a filter such as activated carbon. The operation of this warm air heater is the same as that of the first embodiment. Although the high temperature gas is discharged from the air suction port 5 when the convection fan 2 is stopped, the delay time of the convection fan 2 is lengthened while reducing the odorous components that are normally discharged from the rear surface and diffused into the room by the deodorizing device 13. You can

[0025]

As described above, in the present invention, the convection fan is stopped at the time of ignition, and the delay time from the start of the ignition operation to the driving of the convection fan is changed according to the carburetor temperature at the start of operation. Since it is configured as described above, the odor at the time of ignition can be reduced for the user under a wider condition while satisfying safety aspects such as the standard value of the backside hot air temperature.

Further, in the present invention, in addition to the above-mentioned structure, since the heat shield plate is provided above the air suction port of the convection fan, the safety value such as the standard value of the backside hot air temperature is satisfied, Under a wider range of conditions, the odor at the time of ignition can be reduced for the user.

Further, in the present invention, in addition to the above-mentioned structure, a deodorizing function is provided, so that safety conditions such as the specified value of the backside hot air temperature can be satisfied while the user is ignited under wider conditions. Odor can be reduced,
The odor diffused in the room can also be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a warm air heater according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the warm air heater according to the first embodiment of the present invention.

FIG. 3 is a time chart showing an operation at the time of hot start of the warm air heater according to the first embodiment of the present invention.

FIG. 4 is a time chart showing an operation at cold start of the warm air heater according to Embodiment 1 of the present invention.

FIG. 5 is a cross-sectional view of a main part of a warm air heater showing a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part of a warm air heater showing a third embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a state in which a convection fan of a conventional warm air heater is ignited in a rotating state.

[Fig. 8] Fig. 8 is an explanatory diagram showing a state where ignition is performed with a convection fan of a conventional warm air heater stopped.

FIG. 9 is an explanatory diagram showing a relationship between a convection fan delay time and an odor concentration in a warm air heater.

FIG. 10 is an explanatory diagram showing a relationship between a convection fan delay time and a back surface hot air temperature in the warm air heater.

[Explanation of symbols]

 1 burner 2 convection fan 6 vaporizer 7 fuel pump 8 vaporization heater 9 temperature sensor 10 igniter 11 control unit 12 heat shield plate 13 deodorizing device

Claims (3)

[Claims] 1. A burner for burning vaporized liquid fuel, a vaporizer for feeding vaporized liquid fuel to the burner, a fuel pump for feeding liquid fuel to the vaporizer, and heating the vaporizer to a predetermined temperature. A vaporization heater, a temperature sensor that detects the temperature of the vaporizer, an igniter that ignites the burner, a convection fan that discharges warm air generated by the burner, the fuel pump, a vaporization heater, and a convection A control unit that controls a fan and an igniter to control combustion in the burner, the control unit stops the convection fan at the time of ignition, and starts the ignition operation according to the carburetor temperature at the start of operation. A warm-air heater characterized by changing the delay time from the drive to the convection fan drive. 2. The warm air heater according to claim 1, wherein a heat shield plate is provided above the air suction port of the convection fan. 3. The warm air heater according to claim 2, wherein the heat shield plate has a deodorizing function of activated carbon or the like.