JP2018066522A - Hot air heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which enables a blower fan to be driven at a high rotation speed when a burner does not combust without providing cooling air feeling to a user in a hot air heater.SOLUTION: The specification discloses a hot air heater. The hot air heater includes: a housing including an air inlet and an air outlet; a burner which combusts a fuel to heat air; an electric heater which converts electric power to heat to heat air; and a blower fan which takes air from an indoor space through the air inlet, causes the air to pass through the burner and the electric heater, and sends the air into the indoor space through the air outlet. In the hot air heater, the electric heater heats air when the burner does not combust and the blower fan is driven.SELECTED DRAWING: Figure 3

Description

  The present specification relates to a hot air heater.

  In Patent Document 1, a housing having an air supply port and an air outlet, a burner that burns fuel and heats air, air is taken in from the room through the air supply port, the burner is passed through, and the air outlet is The warm air heater provided with the ventilation fan which sends air out indoors is disclosed. In this hot air heater, when the burner is not combusting and the blower fan is driven, the feeling of cold wind given to the user is suppressed by reducing the rotational speed of the blower fan.

JP 2014-134368 A

  When the burner is not burning, it may be desired to drive the blower fan at a high rotational speed. For example, it is desirable to drive the blower fan at a high rotational speed when it is desired to quickly circulate indoor air or to quickly cool the interior of the housing while the burner is not burning. However, in the technique of Patent Document 1, the blower fan cannot be driven at a high rotational speed when the burner is not combusting.

  In this specification, the technique which solves the said subject is provided. The present specification provides a technology that can drive a blower fan at a high rotational speed when a burner is not combusting in a hot air heater without giving a cold air feeling to a user.

  This specification discloses a warm air heater. The warm air heater includes a housing having an air supply port and an air outlet, a burner that burns fuel to heat the air, an electric heater that converts electric power into heat and heats the air, and an air supply port. And a blower fan that takes in air from the room, passes through the burner and the electric heater, and sends the air into the room through the air outlet. The warm air heater heats the air with an electric heater when the burner is not burning and the blower fan is driven.

  In the hot air heater, the air can be heated by the electric heater when the burner is not combusted and the blower fan is driven. Therefore, even when the blower fan is driven at a high rotational speed when the burner is not combusting, it is possible to prevent the user from feeling cold by heating the air with the electric heater. According to the warm air heater, the blower fan can be driven at a high rotational speed when the burner is not burning without giving the user a feeling of cold air.

The figure which shows typically the structure of the gas fan heater 2 which concerns on an Example. The figure which shows typically the electric system of the gas fan heater 2 which concerns on an Example. The flowchart explaining operation | movement of the gas fan heater 2 which concerns on an Example.

  In one or more embodiments, the hot air heater is configured to heat the air with an electric heater when the burner is not burning and the blower fan is driven and the rotational speed of the blower fan is high. You may make it perform, and when the rotation speed of a ventilation fan is low, you may make it not heat the air by an electric heater.

  Generally, when air is heated by an electric heater, the utility cost is higher than when air is heated by a burner. For this reason, it is desirable to keep the electric heater to the minimum necessary use from the viewpoint of suppressing the utility cost. In the above hot air heater, when the burner is not combusting and the blower fan is driven at a high rotational speed, that is, when there is a high possibility of giving a cold air feeling to the user, the air is heated by the electric heater. Do. Further, in the above hot air heater, when the burner is not combusted and the blower fan is driven at a low rotational speed, that is, when there is a low possibility of giving the user a feeling of cold air, Do not heat. According to said warm air heater, it can prevent giving a user a feeling of cold wind, suppressing the increase in the utility bill by use of an electric heater.

  In one or more embodiments, the hot air heater may use the air taken in from the room via the air supply port as combustion air for the burner, and blow off the combustion exhaust gas from the burner. You may make it send out indoors through an exit.

  In the so-called open-type hot air heater as described above, it is necessary to drive the blower fan at a high rotational speed in the pre-purge operation or the post-purge operation. For this reason, in the open type hot air heater, the blower fan is driven at a higher rotational speed when the burner is not combusted, compared to the semi-enclosed type hot air heater or the closed type hot air heater. There are many opportunities to do. According to the hot air heater described above, in an open hot air heater where there are many opportunities to drive the blower fan at a high rotational speed in a state in which the burner is not combusted, it is possible to prevent the user from feeling cold air. be able to.

(Example)
A gas fan heater 2 according to an embodiment of a hot air heater will be described with reference to FIG. The gas fan heater 2 takes in air from the room through the air supply port 4 on the back surface, burns the fuel gas using the sucked air as combustion air, and converts the air heated by the combustion of the fuel gas into the air outlet 6 on the front surface. The room is heated by sending it into the room. The gas fan heater 2 is a so-called open type gas fan heater.

  The gas fan heater 2 takes in indoor air from a gas supply pipe 8 that supplies fuel gas, a burner 10 that burns fuel gas from the gas supply pipe 8, and an air supply port 4, and blows out the heated air 6, a blower fan 12 that is sent into the room, a control unit 14 that controls the operation of the gas fan heater 2, an operation unit 16 that allows the user to operate the gas fan heater 2, and a housing 18 that houses these. Yes.

  The air supply port 4 is formed on the upper side of the back surface of the housing 18, and the air outlet 6 is formed on the lower side of the front surface of the housing 18. Inside the casing 18, a part of the air flowing in from the air supply port 4 is supplied to the burner 10 as combustion air, and the remaining air is mixed with the combustion exhaust gas of the burner 10 and led to the outlet 6. A passage 20 is formed. The blower fan 12 is disposed downstream of the burner 10 in the internal air passage 20 (between the burner 10 and the outlet 6). The air supply port 4 is provided with an air filter 22 that suppresses entry of dust and the like.

  An electric heater 24 is provided between the blower fan 12 and the outlet 6 in the internal air passage 20. The electric heater 24 generates heat when energized and heats the air passing through the internal air passage 20.

  The gas supply pipe 8 is provided with an electromagnetic on-off valve 26 that opens and closes the gas supply pipe 8. The gas supply pipe 8 is supplied with city gas (for example, gas mainly composed of methane gas (CH 4) such as 13A) from the outside of the gas fan heater 2. The burner 10 is provided with an igniter 28 above the flame opening.

  An indoor temperature sensor 30 is provided on the rear surface of the housing 18. The indoor temperature sensor 30 detects the temperature of indoor air sucked into the housing 18 from the air supply port 4. As the indoor temperature sensor 30, various types such as a thermocouple and a thermistor can be used.

  In the internal air passage 20, a heater temperature sensor 32 is provided in the vicinity of the electric heater 24. The heater temperature sensor 32 detects the temperature of the electric heater 24. As the heater temperature sensor 32, various types such as a thermocouple and a thermistor can be used.

  As shown in FIG. 2, the operation unit 16 sets an operation switch 34 that instructs the user to start and stop the operation of the gas fan heater 2, an abnormality notification buzzer 36 that notifies the user of the occurrence of an abnormality, and a heating target temperature. The temperature setting part 38, the display part 40 which displays various information, such as heating target temperature and room temperature, are provided. The operation switch 34 is configured to alternately instruct the control unit 14 to start and stop operation each time the pressing operation is repeated.

  The control unit 14 controls operations of the blower fan 12, the electric heater 24, the on-off valve 26, the igniter 28, and the like. The control unit 14 includes a memory 42 for storing various programs and data, and a timer 44 for timing.

  When the user operates the operation switch 34 to instruct the start of the operation of the gas fan heater 2, the control unit 14 performs the process shown in FIG.

  In step S <b> 2, the control unit 14 drives the blower fan 12 at a high rotational speed and supplies combustion air to the burner 10. In addition, the control unit 14 opens the on-off valve 26 to supply gas from the gas supply pipe 8 to the burner 10 and ignites the igniter 28 to start combustion of the burner 10. In step S <b> 2, the control unit 14 does not energize the electric heater 24 and does not heat the air by the electric heater 24.

  In step S4, the control unit 14 determines whether or not the room temperature detected by the room temperature sensor 30 is equal to or higher than a predetermined set temperature. The set temperature may be a temperature equal to the heating target temperature, for example. If the room temperature is less than the set temperature (NO in step S4), the process returns to step S4 in order to continue heating the air by the burner 10. If the room temperature is equal to or higher than the set temperature (YES in step S4), the process proceeds to step S6 in order to end the heating of the air by the burner 10.

  In step S6, the control unit 14 switches the rotational speed of the blower fan 12 from a high rotational speed to a low rotational speed. Further, the control unit 14 closes the on-off valve 26 and stops the gas supply from the gas supply pipe 8 to the burner 10, thereby stopping the combustion of the burner 10. In step S <b> 6, the control unit 14 does not energize the electric heater 24 and does not heat the air by the electric heater 24. In this case, the air is not heated by the burner 10 and the air is not heated by the electric heater 24. However, since the blower fan 12 is driven at a low rotational speed, the user is given a cool air feeling. There is no.

  In step S <b> 8, the control unit 14 resets the timer 44 and starts measuring time by the timer 44.

  In step S10, the control unit 14 determines whether or not the room temperature detected by the room temperature sensor 30 is equal to or higher than a set temperature. When the room temperature is less than the set temperature (NO in step S10), the process returns to step S2 in order to resume the heating of the air by the burner 10. If the room temperature is equal to or higher than the set temperature (YES in step S10), the process proceeds to step S12.

  In step S12, the control unit 14 determines whether or not the elapsed time from the start of the time measurement by the timer 44 in step S8 is equal to or longer than the first predetermined time. If the elapsed time is less than the first predetermined time (NO in step S12), the process returns to step S10. If the elapsed time is equal to or longer than the first predetermined time (YES in step S12), the process proceeds to step S14.

  In step S14, the control unit 14 switches the rotational speed of the blower fan 12 from a low rotational speed to a high rotational speed. Further, the control unit 14 energizes the electric heater 24 and heats the air by the electric heater 24. In step S6, the control unit 14 keeps the on-off valve 26 closed and does not heat the air by the burner 10. In this case, the air is not heated by the burner 10, but the air is heated by the electric heater 24. Therefore, even if the blower fan 12 is driven at a high rotational speed, it does not give the user a feeling of cold air. .

  In step S <b> 16, the control unit 14 resets the timer 44 and starts timing by the timer 44.

  In step S18, the control unit 14 determines whether or not the room temperature detected by the room temperature sensor 30 is equal to or higher than a set temperature. If the room temperature is less than the set temperature (NO in step S18), the process returns to step S2 in order to resume the heating of the air by the burner 10. If the room temperature is equal to or higher than the set temperature (YES in step S18), the process proceeds to step S20.

  In step S20, the control unit 14 determines whether or not the elapsed time since the start of time measurement by the timer 44 in step S16 is equal to or longer than a second predetermined time. If the elapsed time is less than the second predetermined time (NO in step S20), the process returns to step S18. If the elapsed time is equal to or longer than the second predetermined time (YES in step S20), the process returns to step S6.

  As described above, the gas fan heater 2 according to this embodiment includes the casing 18 including the air supply port 4 and the air outlet 6, the burner 10 that burns the city gas and heats the air, and converts the electric power into heat. And an air heater 24 that heats the air and a blower fan 12 that takes in air from the room through the air supply port 4, passes the burner 10 and the electric heater 24, and sends the air into the room through the air outlet 6. ing. The gas fan heater 2 heats air by the electric heater 24 when the burner 10 is not combusted and the blower fan 12 is driven.

  The gas fan heater 2 according to the present embodiment heats the air by the electric heater 24 when the burner 10 is not combusted and the blower fan 12 is driven and the blower fan 12 has a high rotational speed. When the rotation speed of the blower fan 12 is low, the air is not heated by the electric heater 24.

  The gas fan heater 2 of the present embodiment uses the air taken in from the room through the air supply port 4 as combustion air for the burner 10, and the combustion exhaust gas from the burner 10 enters the room through the outlet 6. Send it out.

  If the gas fan heater 2 does not include the electric heater 24, a method of burning the burner 10 with a weak thermal power is conceivable so as not to give the user a feeling of cold air when driving the blower fan 12. . However, when this method is used, the burner 10 repeatedly ignites and extinguishes, and the ignition sound of the burner 10 is frequently generated, causing discomfort to the user and increasing the amount of carbon monoxide emitted. There is a risk that. On the other hand, in the gas fan heater 2 of the present embodiment, air is heated by the electric heater 24 so as not to give the user a feeling of cold air. According to the gas fan heater 2 of the present embodiment, frequent occurrence of the ignition sound of the burner 10 which becomes a problem when the burner 10 is burned with weak thermal power in order not to give the user a feeling of cold wind, An increase in carbon monoxide emissions can be prevented.

  In the above-described example, the gas fan heater 2 is illustrated and described as an embodiment of the hot air heater. However, the hot air heater disclosed in the present specification is not limited to this, for example, an oil fan. A heater, a gas stove, an oil stove, or the like may be used.

  In the above embodiment, the hot air heater uses the air taken in from the room via the air supply port as combustion air for the burner, and sends the combustion exhaust gas from the burner into the room through the outlet. Although the case where it is what is called an open type warm air heater was demonstrated, the warm air heater which this specification discloses is not restricted to this. The warm air heater disclosed in the present specification uses, for example, air taken in from a room via an air supply port as combustion air for the burner, and exhausts combustion exhaust gas from the burner to the outside through an exhaust pipe. It may be a so-called semi-enclosed hot air heater that discharges, or air taken from the outside through an air supply pipe is used as combustion air for the burner, and combustion exhaust gas from the burner is sent to the exhaust pipe. It may be a so-called hermetic hot air heater that is discharged outside through the room.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

2: Gas fan heater 4: Air supply port 6: Air outlet 8: Gas supply pipe 10: Burner 12: Blower fan 14: Control unit 16: Operation unit 18: Housing 20: Internal air passage 22: Air filter 24: Electricity Heater 26: Open / close valve 28: Igniter 30: Indoor temperature sensor 32: Heater temperature sensor 34: Operation switch 36: Abnormality alarm buzzer 38: Temperature setting unit 40: Display unit 42: Memory 44: Timer

Claims (3)

A housing having an air supply opening and an air outlet;
A burner that burns fuel and heats the air;
An electric heater that converts electric power into heat and heats the air;
It has a blower fan that takes in air from the room through the air supply port, passes the burner and the electric heater, and sends the air into the room through the air outlet,
A hot air heater that heats air with an electric heater when the burner is not burning and the blower fan is driven.   When the burner is not combusting and the blower fan is driven, air is heated by the electric heater when the blower fan is rotating at a high speed, and when the blower fan is rotated at a low speed, the electric heater is used. The hot air heater according to claim 1, wherein the air is not heated. Use the air taken from the room through the air inlet as combustion air for the burner,
The hot air heater according to claim 1 or 2, wherein the combustion exhaust gas from the burner is sent out indoors through the blowout port.

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