JP2016223676A - Hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem on a risk of accidental fire caused by lifting of flame from a flame hole, as in a case when an operation is implemented with a minimum heating capacity regardless of a room temperature, a heating capacity is quickly lowered through a combustion state of a burner is not completely stabilized as only a short time has passed from the start of the operation, as it is necessary to quickly lower the heating capacity to the minimum heating capacity after termination of the operation with a maximum heating capacity by pressing an operation switch.SOLUTION: In an operation for fixing a heating capacity in a low state, an operation with a heating capacity 12 for a prescribed time after switching on an operation switch is terminated, and then a speed for lowering the heating capacity toward a heating capacity 1 is reduced in a manner that a speed for lowering from an intermediate heating capacity 6 to the heating capacity 1, is slower than a speed for lowering to the intermediate heating capacity 6 from the state of the heating capacity 12.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hot air heater equipped with a gas burner inside.

  Conventional hot air heaters of this type are equipped with a gas burner inside the appliance, provided with an intake port for taking in indoor air at the back of the appliance, and blowing hot air from the inside of the appliance into the room on the front. A blower opening is provided. And the ventilation fan is arrange | positioned inside the instrument, The air is taken in from the inlet port by this ventilation fan, and the air which flowed in the instrument is discharged | emitted from a ventilation port. A part of the air flowing in the instrument is used as air for combustion of the gas burner, and the high-temperature combustion gas generated in the gas burner is mixed with air and blown from the blower opening as warm air. A temperature sensor for detecting the temperature of room air taken into the appliance is provided near the air inlet.

  This hot air heater is equipped with a switch for setting the temperature.When the operation switch is turned on, the indoor air temperature is set after the gas heater has been stabilized for a predetermined time by operating at the maximum heating capacity. The heating capacity is automatically changed to reach the desired temperature. That is, immediately after the operation switch is turned on, the operation is performed at the maximum heating capacity, but thereafter, as the room temperature rises, the operation capacity automatically decreases gradually (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-210468

  In the above control, since the room temperature does not change rapidly, the heating capacity is reduced relatively slowly. For example, the heating capacity is set so that it can be switched to 12 levels, and the heating capacity is controlled to decrease by 1 level every about 25 seconds.

  As described above, in the conventional hot air heater, the user sets a target room temperature and the heating capacity is controlled so that the room temperature becomes the set temperature. However, the constant heating is performed regardless of the room temperature. There has been a demand to drive with capacity. In particular, there is a high need for operation with a minimum heating capacity regardless of the room temperature. In such a case, after the operation switch is pushed and the operation at the maximum heating capacity is completed, it is necessary to quickly reduce the heating capacity to the minimum heating capacity, but only a short time has passed since the operation was started. Therefore, the heating capacity is rapidly lowered when the burner is not completely stable.

  Then, if the heating power of the burner is reduced more rapidly from a state where the heating power of the burner is reduced to some extent, the combustion speed of the gas ejected from the burner's flame outlet cannot catch up with the gas ejection speed, and the flame lifts from the flame mouth, There is a risk of misfire.

  Then, this invention makes it a subject to provide the warm air heater which can reduce a heating capability rapidly so that it may not misfire immediately after a driving | operation start in view of said problem.

  In order to solve the above problems, a hot air heater according to the present invention includes a gas burner inside, introduces indoor air into the appliance, and mixes hot air generated from the gas burner with the introduced indoor air. A warm air heater that discharges as warm air outside the appliance, and when the power switch is turned on, the heating capacity is automatically lowered so that the heating capacity can be reached after operating for a predetermined time with high heating capacity. When the operation of fixing the heating capacity to a low state is performed, after the operation for a predetermined time in the state where the heating capacity is high after the operation switch is turned on is finished, the heating capacity is reduced to a low state. The speed at which the heating capacity is lowered is lower than the speed at which the heating capacity is lowered from the high heating capacity to the predetermined intermediate heating capacity, and the speed at which the heating capacity is lowered from the intermediate heating capacity to the low heating capacity is reduced. That.

  In a state where the heating capacity is lowered to a predetermined intermediate heating capacity, misfire is relatively difficult to occur, and misfiring is likely to occur in a state where the heating capacity is lowered from the intermediate heating capacity to a low state. Therefore, by reducing the speed at which the heating capacity is lowered from the intermediate heating capacity to the predetermined intermediate heating capacity at a lower speed, the heating capacity is reduced while preventing the occurrence of misfire. Reduced the time to lower to as low as possible.

  Misfires are more likely to occur when the temperature of the indoor air taken in as combustion air is lower. Therefore, a temperature sensor for detecting the temperature of the indoor air is provided, and when the temperature of the indoor air is lower than a predetermined temperature, the speed of lowering the intermediate heating capacity from the intermediate heating capacity to the low heating capacity is further reduced. Is desirable.

  As is apparent from the above description, the present invention can prevent the occurrence of misfire in the burner when the heating capacity is rapidly lowered from the high heating capacity to the low heating condition.

Diagram showing the appearance of a hot air heater Sectional view showing internal structure of hot air heater Structural diagram for explaining the operation of the hot air heater Graph showing the rate of decrease in heating capacity Flow chart showing heating capacity reduction control Flow chart showing second reduction control of heating capacity

  Referring to FIG. 1, reference numeral 1 denotes a warm air heater according to the present invention, which includes a blower port 11 at a lower front portion, and air introduced into the warm air heater 1 from an intake port 12 provided on the back surface. It is configured so as to be warmed inside to produce warm air and to blow air from the air blowing port 11 into the room.

  An operation switch 13 is provided on the upper surface of the hot air heater 1, and when the operation switch 13 is pressed, a heating operation is started. Reference numeral 14 denotes a temperature setting switch. The heating capacity is automatically adjusted so that the room temperature becomes the temperature set by the temperature setting switch 14, and the amount of air blown from the air blowing port 11 is increased or decreased. Reference numeral 15 denotes a spot heating switch. When the spot heating switch 15 is pushed, the heating capacity is controlled to be fixed to a minimum regardless of the room temperature.

  Referring to FIGS. 2 and 3, a hot air fan 3 made of a white fan is provided inside the hot air heater 1. When the air fan 3 is rotated, indoor air is supplied from the intake port 12 to the hot air heater. 1 is introduced, and the introduced air is blown into the room from the blower port 11. A gas burner 2 is provided inside the warm air heater 1, and a part of the air introduced into the warm air heater 1 by the blower fan 3 is used as combustion air, and the burner 2 is combusted. To do.

  The high-temperature combustion gas generated in the burner 2 is mixed with other introduced air in the warm air heater 1 and is blown into the room from the air outlet 11 as warm air. A temperature sensor 41 is provided in the vicinity of the intake port 12, and the temperature of the room air is detected by the temperature sensor 41.

  The temperature data detected by the temperature sensor 41 is input to the control unit 4. In addition, the control unit 4 is connected to the power switch 13, the temperature setting switch 14, and the spot heating switch 15. In addition, two on-off valves 16 and a capacity control valve 17 that increases or decreases in opening degree are provided in series in the pipeline for supplying gas to the burner 2, both of which are opened by the control unit 4. It is configured to be controlled.

  When the operation switch 13 is turned on, in order to stabilize the combustion state of the burner 2, the control unit 4 sets the opening degree of the capacity control valve 17 to the maximum opening degree and sets the rotation speed of the blower fan 3 to the maximum rotation speed. Operate for a predetermined time at maximum heating capacity. In the present embodiment, the heating capacity is switched in stages from the maximum heating capacity state to the fire extinguishing state in 12 stages.

  On the other hand, when the spot heating switch 15 is pressed, when the operation at the maximum heating capacity is completed, the opening degree of the capacity control valve 17 is narrowed so that the minimum heating capacity state is reached regardless of the room temperature, and the rotation speed of the blower fan 3 is decreased. Decelerated and continued operation with minimum heating capacity. However, instead of switching from the maximum heating capacity state to the minimum heating capacity state at once, the heating capacity is gradually reduced. However, since the user desires that the heating capacity is minimized as soon as the user presses the spot heating switch 15, it is desirable that the heating capacity decrease rate is fast. However, if the heating capacity is reduced, there is a risk that a lift is generated in the burner 2 and the fire is misfired when the heating capacity decreases at a high rate.

  Therefore, as shown in FIG. 4, from the maximum heating capacity (heating capacity 12) to the midway heating capacity 6, each stage is decreased every 0.5 seconds to rapidly decrease the heating capacity. Then, from the heating capacity 6 to the heating capacity 1 which is the minimum heating capacity, the heating speed is decreased every 2 seconds so that the burner 2 does not cause a lift, and the heating capacity decreasing speed is reduced. However, since it becomes easier to lift when the room temperature is low, the heating capacity is decreased every 3 seconds when the room temperature is lower than 10 ° C.

  This heating capacity reduction control will be described in detail with reference to FIG. 5. When the operation switch 13 is pushed and the operation is started (S1), the maximum heating capacity (heating capacity 12) is set for a predetermined time t as described above. ) (S2, S3). And if this predetermined time t passes, a heating capability will be reduced from the heating capability 12 to the heating capability 6 every 0.5 second as mentioned above (S4).

  Next, it is determined whether the room temperature detected by the temperature sensor 41 is 10 ° C. or higher (S5). If the room temperature is 10 ° C. or higher, the heating capacity is decreased every 2 seconds (S6, S7). ). When the heating capacity is reduced to 1, the state is continued (S9).

  When the room temperature is lower than 10 ° C., the heating capacity is reduced every 3 seconds (S8).

  In the flow shown in FIG. 5, when the heating capacity is decreased from capacity 6 to capacity 1, the room temperature is first determined in S5. If the room temperature is 10 ° C. or higher at that time, the heating capacity is reduced in 2 seconds. If the temperature is lower by one step and lower than 10 degrees, the heating capacity is lowered by one step in 3 seconds, but may be controlled as shown in FIG.

  In the flow shown in FIG. 6, after the heating capacity is lowered to the heating capacity 6 (S4), the room temperature is uniformly determined for 2 seconds (S100), and the room temperature is determined when 2 seconds have elapsed. At that time, if the room temperature is 10 ° C. or higher (S101), the heating capacity is lowered by one level (S7), but if it is lower than 10 ° C., the heating capacity is lowered by one level after 3 seconds (S102). However, if the room temperature rose to 10 ° C. or more before 3 seconds passed (S103), the heating capacity was immediately lowered by one step without waiting for 3 seconds (S103, S7).

  By the way, as described above, the risk of lift increases as the heating capacity decreases. Therefore, in the above embodiment, when the heating capacity falls below the heating capacity 6, the timing for lowering the heating capacity is uniformly extended from 0.5 seconds to 2 seconds or 3 seconds, but from the heating capacity 6 toward the heating capacity 1 The timing may be gradually extended, and control may be performed so that the timing at which the heating capacity 2 is finally switched to the heating capacity 1 is 2 seconds or 3 seconds.

  In addition, this invention is not limited to an above-described form, You may add a various change in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Hot-air heater 2 Gas burner 3 Blower fan 4 Control part 11 Blower inlet 12 Inlet 13 Operation switch 14 Temperature setting switch 15 Spot heating switch 16 On-off valve 17 Capability control valve 41 Temperature sensor

Claims (2)

  A hot air heater that includes a gas burner inside, introduces indoor air into the appliance, mixes the hot air generated from the gas burner and the introduced indoor air, and discharges it as hot air outside the appliance, When turning on the power switch, after operating for a predetermined time in a state where the heating capacity is high, and automatically reducing the heating capacity so as to become the predetermined heating capacity, an operation for fixing the heating capacity to a low state is performed. After the operation for a predetermined time in the state where the heating capacity is high after the operation switch is turned on, the speed at which the heating capacity is lowered toward the state where the heating capacity is low is changed from a state where the heating capacity is high to a predetermined intermediate level. A warm air heater characterized in that the speed at which the heating capacity is lowered from the intermediate heating capacity to the state where the heating capacity is low is slower than the speed at which the heating capacity is lowered to the heating capacity.   A temperature sensor for detecting the temperature of the indoor air is provided, and when the temperature of the indoor air is lower than a predetermined temperature, the speed of lowering the intermediate heating capacity from the intermediate heating capacity to the low heating capacity is further reduced. The hot air heater according to claim 1.

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