JP3701490B2 - Hot air heater - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a hot air heater such as an oil fan heater.
[0002]
[Prior art]
Conventionally, in this type, for example, as shown in FIGS. 1 and 5, reference numeral 1 denotes a vaporizing cylinder for vaporizing fuel pumped by an electromagnetic pump 2, which is supplied by the vaporized fuel and the combustion fan 3. Combustion air is premixed and burned by a burner 4 having a flame hole formed in the upper net.
[0003]
A combustion cylinder 5 is provided so as to surround the burner 4. A catalyst body 7 for purifying and deodorizing the combustion gas is fixed to the upper part of the combustion cylinder via a rectifying plate 6.
[0004]
Reference numeral 8 denotes a convection fan attached to the back side of the main body 9. The air blown by the convection fan 8 is mixed with the combustion gas from the burner 4 to exchange heat, and there are many louvers 10 on the front side of the main body 9. The room is heated by being blown into the room as warm air from the provided hot air outlet 11.
[0005]
An operation unit 14 is provided on the upper surface of the main body 9 and includes an operation switch 15 for instructing start and stop of the heating operation and a room temperature setting switch 16 for setting a desired room temperature.
[0006]
Reference numeral 17 denotes a combustion amount determining means for determining the combustion amount of the burner 4 based on the temperature difference between the set room temperature set by the room temperature setting switch 16 and the detected room temperature detected by the room temperature detecting means 18. Reference numeral 19 denotes burner control means for controlling the burner 4 to be burned to the combustion amount determined by the combustion amount determining means 17.
[0007]
Reference numeral 20 denotes a rotational speed determining means for selecting a blown air amount corresponding to the combustion amount determined by the combustion amount determining means 17, that is, a rotational speed of the convection fan 8. The combustion amount is rated maximum (for example, 2750 kcal / h, hereinafter referred to as “large”). When the rotation speed of the convection fan 8 is selected, the rotation speed of the convection fan 8 is selected to be a strong rotation (for example, 1050 rpm, hereinafter referred to as the rated maximum rotation speed and referred to as 100% rotation). The rotational speeds of 60% and 30% are selected, respectively. Reference numeral 21 denotes convection fan control means for drivingly controlling the convection fan 8 at the rotation speed selected by the rotation speed determination means 20.
[0008]
The combustion amount determination means 17, the burner control means 19, the rotation speed determination means 20, and the convection fan control means 21 are provided in a control unit 22 constituted by a microcomputer.
[0009]
Now, the operation of this conventional apparatus will be described with reference to the flowchart shown in FIG. 6. In step 1 (hereinafter abbreviated as S1), it is determined whether or not the operation switch 15 has been pressed. 19 ignites the burner 4.
[0010]
Next, in S3, the combustion amount determining means 17 determines the combustion amount based on the temperature difference between the set room temperature and the detected room temperature, and in the next S4, the rotational speed determining means 20 determines the rotational speed of the convection fan 8 corresponding to the combustion amount. In addition to the selection, the heating operation is performed in the normal operation in which the burner 4 and the convection fan 8 are controlled with the determined combustion amount and rotation speed, respectively.
[0011]
[Problems to be solved by the invention]
By the way, in this conventional one, the amount of combustion and the number of rotations are uniquely determined under any conditions. For example, combustion is performed at an outside temperature at the start of heating in a 6 tatami room and at a room temperature of 10 ° C. Under the condition that the amount is fixed at 2750 kcal / h, the room temperature distribution chart (100 (a) in FIG. 7) at a height of 100 mm from the floor 1 minute after ignition shows a short hot air reach distance and convection of room air. The effect of the room temperature distribution is 350mm high from the floor 10 minutes after ignition, as shown in Fig. 7 (b). The front space of the hot air heater is warm, but the space other than the front is at room temperature. The room temperature was still low and the temperature in the room was very uneven. There were few comfortable heating spaces of about 21 ° C. or more, and the temperature rise of the whole room from the start of heating was slow, so that the heating efficiency was poor and uneconomical.
[0012]
Here, in order to enhance the convection effect, it is conceivable to set the rated maximum rotational speed corresponding to the rated maximum combustion amount to a higher value, but this increases the power consumption and the noise level. It had the disadvantages to say.
[0013]
[Means for solving problems]
The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the configuration includes a burner, a convection fan, a room temperature setting means for setting a desired room temperature, a room temperature detection means for detecting the room temperature, and a set room temperature. In a hot air heater comprising a combustion amount determining means for determining a combustion amount of a burner based on a temperature difference from a detected room temperature, and a rotational speed determining means for determining a rotational speed of a blower fan corresponding to the combustion amount Convection promoting means for setting the rotational speed of the blower fan to a rotational speed higher than the rated maximum rotational speed in preference to the rotational speed determining means for a predetermined time from the start of heating is provided, and when the predetermined time has elapsed, the convection promoting means And the rotational speed of the convection fan is determined by the rotational speed determination means.
[0014]
In particular, the burner, the convection fan, the room temperature setting means for setting the desired room temperature, the room temperature detection means for detecting the room temperature, and the burner combustion amount based on the temperature difference between the set room temperature and the detected room temperature. A temperature at which a detected room temperature is compared with a predetermined temperature in a warm air heater having a combustion amount determining means for determining and a rotational speed determining means for determining the rotational speed of a blower fan corresponding to the combustion amount The comparison means and a time for selecting a first predetermined time when the detected room temperature is equal to or higher than a predetermined temperature at the start of heating, and for selecting a second predetermined time longer than the first predetermined time when the detected room temperature is lower than the predetermined temperature The first or second predetermined time selected by the selection means and the time selection means from the start of heating is set to a higher rotational speed than the rated maximum rotational speed in preference to the rotational speed determining means. Convection promoting means Was assumed to determine the rotational speed of the convection fan by the first or second of the rotational speed determining means releases the setting of the convection promotion means When a predetermined time has elapsed.
[0015]
Also provided is an initial combustion amount storage means for storing the burner combustion amount at the start of heating, and a combustion amount comparison means for comparing the combustion amount of the burner during heating operation with the combustion amount stored in the initial combustion amount storage means. When the second predetermined time is selected and the first predetermined time has elapsed since the start of heating, when the temperature comparing means determines that the room temperature is equal to or higher than the predetermined temperature, or the amount of combustion When the combustion amount is lower than the combustion amount stored in the initial combustion amount comparison unit by the comparison unit, the setting of the convection promoting unit is canceled and the rotation number of the convection fan is determined by the rotation number determination unit. .
[0016]
[Action]
With the above configuration, the rotational speed of the convection fan 8 is always driven at a rotational speed higher than the rated maximum rotational speed at the start of heating to enhance the convection effect of the room air, and after a predetermined time has elapsed, the rotational speed is adjusted to the amount of combustion. Therefore, the room temperature can be brought close to the set room temperature quickly and uniformly, and the power consumption and noise value are not increased unnecessarily.
[0017]
When the room temperature detected by the room temperature detecting means 18 at the start of heating is a predetermined temperature (for example, 18 ° C.) or higher, the rotational speed of the convection fan 8 is set to a rotational speed higher than the rated maximum rotational speed for a first predetermined time (for example, 1 minute). Only when the detected room temperature is lower than a predetermined temperature (18 ° C.), the rotational speed of the convection fan 8 is fixed at a rotational speed higher than the rated maximum rotational speed for a second predetermined time (for example, 10 minutes). Heating is performed, and after the selected first or second predetermined time has elapsed, the number of revolutions corresponding to the amount of combustion is set, so that the convection effect of room air is always improved at the start of heating, and the room temperature is made early and uniform. Therefore, the power consumption and the noise value are not increased unnecessarily.
[0018]
In addition, when the room temperature at the start of heating is lower than the predetermined temperature (18 ° C.) and the second predetermined time (10 minutes) is selected, the first predetermined time (1 minute) has elapsed since the start of heating. When the room temperature is equal to or higher than the predetermined temperature (18 ° C.) or when the combustion amount is lower than the initial combustion amount, the setting of the convection promoting means 23 is canceled, and the rotational speed of the convection fan 8 is set according to the combustion amount. Since normal operation is performed at a rotational speed, the room temperature is not increased more than necessary.
[0019]
【Example】
Next, a hot air heater according to the present invention will be described with reference to an embodiment shown in the drawings.
In addition, since the structure of a warm air heater is the same as the conventional one, the same thing uses the same code | symbol and abbreviate | omits description.
[0020]
23 indicates that the rotation speed of the convection fan 8 is higher than 100% rotation (for example, 1150 rpm, hereinafter referred to as 110% rotation), which is the maximum rotation speed (rated maximum rotation speed; for example, 1050 rpm) during normal operation, regardless of the combustion amount. The convection promoting means that performs the convection promoting operation fixed to the above is operated in preference to the rotational speed determining means 20 for a predetermined time at the start of heating, and promotes convection of the room air.
[0021]
Reference numeral 24 denotes temperature comparison means for comparing the detected room temperature of the room temperature detection means 18 with a predetermined temperature, and reference numeral 25 denotes a first predetermined time during which the convection promoting means is operated by the output of the temperature comparison means 24 or the first Time selection means for selecting a second predetermined time longer than the predetermined time, and the selected first or second predetermined time is counted by the time measuring means 26.
[0022]
The predetermined time during which the convection promoting means 23 operates is determined by the time selecting means 25. That is, when the detected room temperature is equal to or higher than a predetermined temperature (here, 18 ° C.), the convection promoting means 23 is operated for a first predetermined time (here, 1 minute), and when the detected room temperature is lower than the predetermined temperature (18 ° C.). Activates the convection promoting means for the second predetermined time (here 10 minutes), and when the time counting means 26 counts up the selected first or second predetermined time, the setting of the convection promoting means 23 is canceled and the rotation The routine shifts to a normal operation in which the convection fan 8 is driven at a rotational speed corresponding to the combustion amount by the number determining means 20.
[0023]
27 is an initial combustion amount storage means for storing the combustion amount at the start of heating determined by the combustion amount determination means 17, and 28 is determined by the combustion amount determination means 17 after the first predetermined time has elapsed. It is a combustion amount comparison means for comparing the combustion amount of the burner 4 with the combustion amount stored in the initial combustion amount storage means 28.
[0024]
When the second predetermined time is selected, the convection promotion operation is canceled not only by counting up the second predetermined time, but also by the temperature comparison means 24, the room temperature becomes equal to or higher than the predetermined temperature (18 ° C.). In some cases, or when the combustion amount comparing means 28 determines that the combustion amount has decreased below the initial combustion amount.
[0025]
Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. 3. If the operation switch 15 is pressed (Yes in S5), the burner 4 is ignited in S6, and then the combustion amount in S7. The determining means 17 determines the combustion amount based on the temperature difference between the set room temperature and the detected room temperature.
[0026]
In the next S8, the determined combustion amount is stored in the initial combustion amount storage means 27, and in S9, it is determined by the temperature comparison means 24 whether or not the detected room temperature is equal to or higher than the predetermined temperature (18 ° C.). The time selecting means 25 selects the first predetermined time (1 minute), the time measuring means 26 starts counting the first predetermined time (1 minute), and activates the convection promoting means 23 in S11, and the convection fan 8 The convection promotion operation is started to fix the rotation speed at 110%.
[0027]
Next, when the time counting means 26 counts up the first predetermined time (1 minute) (Yes in S12), the setting of the convection promoting means 23 is canceled in S13, and the rotational speed corresponding to the combustion amount by the rotational speed determining means 20 Thus, the operation shifts to a normal operation for driving the convection fan 8.
[0028]
In the case of No in S9, that is, when the detected room temperature is lower than the predetermined temperature (18 ° C.), the time selection means 25 selects the second predetermined time (10 minutes), and this second predetermined time (10 The counting means 26 starts counting, and the convection promoting means 23 is operated in S15 to start the convection promoting operation for fixing the rotational speed of the convection fan 8 to 110% rotation.
[0029]
In S16, when the time measuring unit 26 counts 1 minute, the process proceeds to S17. This is because the convection promoting operation is always performed for the first predetermined time (1 minute), and the convection effect is always increased at the start of heating so as to raise the room temperature uniformly.
[0030]
In the next S18, it is determined whether the time counting means 26 has counted the second predetermined time (10 minutes). If No, the process proceeds to S19, and the temperature comparison means 24 determines whether the detected room temperature is equal to or higher than the predetermined temperature (18 ° C.). If No, the process proceeds to S20, and the combustion amount determination means 1 determines the combustion amount according to the temperature difference between the detected room temperature and the set room temperature.
[0031]
Next, in S21, the combustion amount comparison means 28 compares the combustion amount determined by the combustion amount determination means 17 with the combustion amount at the start of combustion stored in the initial combustion amount storage means, and the combustion amount is determined from the initial combustion amount. If not, the process returns to S17 to continue the convection promoting operation.
[0032]
The above steps S17 to S21 are repeated, and if YES is determined in any of steps S17, S18, and S21, that is, when the second predetermined time (10 minutes) has elapsed, or the detected room temperature is predetermined. When the temperature becomes equal to or higher than the temperature (18 ° C.) or when the combustion amount is lower than the initial combustion amount, the routine proceeds to S13, where the setting of the convection promoting means 23 is canceled, and the rotational speed corresponding to the combustion quantity by the rotational speed determining means 20 Thus, the operation shifts to the normal operation for driving the convection fan 8.
[0033]
As described above, the first and second predetermined times for operating the convection promoting means are provided because the convection effect is short when the room is relatively warm or when heating is frequently started and stopped. This is because when the room is cold and the room is cold, the convection effect is slightly increased to raise the room temperature uniformly.
[0034]
FIG. 4 is a room temperature distribution diagram when the hot air heater according to the present invention is used. The test conditions are the outside air temperature at the start of heating and the room temperature of 10 ° C., the room size is 6 tatami mats, and the combustion amount is 2750 kcal / h. It is fixed and has the same conditions as the conventional room temperature distribution diagram (FIG. 7).
[0035]
(A) is a room temperature distribution chart at a height of 100 mm from the floor surface after 1 minute of ignition. The reach of hot air is longer and the convection effect of room air is higher than the conventional one (Fig. 7 (a)). I understand that.
[0036]
(B) is a room temperature distribution chart 350 mm high from the floor 10 minutes after ignition, and almost the entire measurement area is about 21 ° C. or higher compared to the conventional one (FIG. 7 (b)). The temperature unevenness is almost eliminated, and the comfortable temperature space is increased by about 4 times.
[0037]
As described above, the rotational speed of the convection fan 8 is made higher than the rated maximum rotational speed only for a short time at the start of heating, and the room temperature is brought close to the set room temperature quickly and uniformly. The power consumption is not changed and the power consumption is reduced, resulting in a reduction in combustion consumption and energy saving.
[0038]
【The invention's effect】
As described above, according to the present invention, the convection effect of the room air is increased by increasing the rotational speed of the convection fan from the rated maximum rotational speed by the convection promoting means at the start of heating, and the temperature unevenness in the room is substantially eliminated. In addition to improving the rapid heating effect, which allows the room temperature to be brought close to the set room temperature quickly and uniformly, the rotation speed of the convection fan is made higher than the rated maximum rotation speed only for a short time at the start of heating, thus reducing power consumption. Above, the rated maximum noise value has an excellent effect that it is not different from the conventional one.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a hot air heater according to an embodiment and a conventional example of the present invention.
FIG. 2 is a block diagram of an embodiment according to the present invention.
FIG. 3 is a flowchart of the same.
FIG. 4 is a room temperature distribution diagram after 1 minute of ignition and after 10 minutes of ignition when the hot air heater according to the present invention is used.
FIG. 5 is a block diagram of a conventional example.
FIG. 6 is a flowchart of the same.
FIG. 7 is a room temperature distribution diagram after 1 minute of ignition and after 10 minutes of ignition when a conventional hot air heater is used.
[Explanation of symbols]
4 Burner 8 Convection fan 16 Room temperature setting switch 17 Combustion amount determination means 18 Room temperature detection means 20 Rotation speed determination means 23 Convection promotion means 24 Temperature comparison means 25 Time selection means 27 Initial combustion amount determination means 28 Combustion amount comparison means

Claims (3)

Burner, convection fan, room temperature setting means for setting a desired room temperature, room temperature detection means for detecting the room temperature, and combustion amount determination means for determining the combustion amount of the burner based on the temperature difference between the set room temperature and the detected room temperature And a rotational speed determining means for determining the rotational speed of the blower fan corresponding to the amount of combustion, the predetermined time from the start of heating is given priority over the rotational speed determiner in order to determine the rotational speed of the blower fan. Convection promoting means for setting the rotational speed to a rotational speed higher than the rated maximum rotational speed is provided, and when the predetermined time has elapsed, the setting of the convection promoting means is canceled and the rotational speed of the convection fan is determined by the rotational speed determining means. A hot air heater characterized by that. Burner, convection fan, room temperature setting means for setting a desired room temperature, room temperature detection means for detecting the room temperature, and combustion amount determination means for determining the combustion amount of the burner based on the temperature difference between the set room temperature and the detected room temperature And a temperature comparison means for comparing the detected room temperature with a predetermined temperature, and a heating start, in the hot air heater comprising a rotation speed determination means for determining the rotation speed of the blower fan corresponding to the combustion amount Time selection means for selecting a first predetermined time when the detected room temperature is at or above a predetermined temperature, and for selecting a second predetermined time longer than the first predetermined time when the detected room temperature is lower than the predetermined temperature; and heating start Convection promoting means for setting the rotational speed of the blower fan to a rotational speed higher than the rated maximum rotational speed in preference to the rotational speed determining means for the first or second predetermined time selected by the time selecting means from Providing the first or first Warm air heater, characterized in that to determine the rotational speed of the convection fan by the rotation speed determining means releases the setting of the convection promotion means When a predetermined time has elapsed. An initial combustion amount storage means for storing the combustion amount of the burner at the start of heating, and a combustion amount comparison means for comparing the combustion amount of the burner during the heating operation with the combustion amount stored in the initial combustion amount storage means, When the second predetermined time is selected and the first predetermined time has elapsed from the start of heating, when the temperature comparing means determines that the room temperature is equal to or higher than the predetermined temperature, or the combustion amount comparison When the combustion amount is reduced below the combustion amount stored by the initial combustion amount comparison means, the setting of the convection promoting means is canceled and the rotational speed of the convection fan is determined by the rotational speed determination means. The warm air heater according to claim 2.

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