JP5121749B2 - Hot air heater - Google Patents

Description

  The present invention relates to a hot air heater having a combustion operation control function for executing an ignition operation again when a misfire occurs due to a lack of gas during a combustion operation.

  Conventionally, as a hot air heater as described above, a burner for burning liquid fuel, a fuel supply means for supplying fuel to the burner, a fuel detection means for detecting the presence or absence of fuel, and the fuel supply means are controlled. A combustion appliance that includes a combustion control unit that performs combustion with the burner and performs an ignition operation again when a misfire occurs due to a lack of gas during the combustion operation is known (see Patent Document 1).

  This combustion appliance temporarily stops combustion by a signal indicating no fuel from the fuel detection means, and starts counting for a certain time by the timer means, and a signal with fuel from the fuel detection means comes within a certain time. Combustion is automatically restarted, and after a certain period of time, combustion is not restarted even if a fuel detection signal comes from the fuel detection means.

JP 09-280558 A

  In the above-mentioned combustion appliance, after a certain period of time, even if a fuel detection signal comes from the fuel detection means, combustion will not resume, so if you leave it for a long time in a cold region, the room temperature will drop and the household goods will freeze There's a problem.

  An object of the present invention is to provide a hot air heater that prevents a household item from freezing when a misfire occurs due to a lack of gas during combustion operation while the user is away.

The present invention includes an intake means for taking in outdoor air, a combustion means to which air sucked by the intake means is supplied and fuel gas is supplied and combusted, and a combustion gas burned by the combustion means is exhausted outside the room. Exhaust means for conducting, heat exchange means provided in the exhaust means for conducting heat of the combustion gas to room air, and air blowing means for blowing the room air so that heat is conducted by the heat exchange means A warm air heater comprising a room temperature sensor for detecting a room temperature, a room temperature setting switch for setting a target room temperature, and a combustion operation control means for controlling the operation of the combustion means, wherein the combustion operation control means comprises a combustion The misfire determination means for determining whether or not the combustion means has misfired during operation, the time measuring means for determining the elapse of a predetermined time, and the time measuring means from the time when the misfire determination means has determined that the misfire has occurred. And ignition operation means for performing an ignition operation when it is determined the constant time, the ignition determination means for determining whether or not ignited at the ignition operation means, the temperature sensor target room temperature and set by the temperature setting switch When the predetermined time has elapsed from the time when the difference from the detected room temperature detected by the above is determined to be not more than a predetermined temperature and the time determining means determines that the ignition has not been ignited, the ignition operation means the operation of possess a retry means for repeating until it is determined that the ignition by the ignition determining means, when it is determined that the ignition by the ignition determining means in the ignition operation by the retry means, said combustion operation control means heat Is forcibly executing a relatively high combustion operation .

  According to the present invention, it is determined that the ignition operation means ignites the operation to be ignited by the ignition operation means when the predetermined time has elapsed from when the combustion operation control means determines that the ignition determination means does not ignite. Therefore, the combustion operation is resumed when fuel is supplied in the case of misfire due to a lack of gas during the combustion operation while the user is away from the cold region. Thereby, it can prevent that household goods freeze.

It is a system configuration figure showing an example of the warm air heater concerning the present invention. It is a control block diagram in the warm air heater of FIG. It is a flowchart which shows the retry operation control process in FIG.

  Referring to FIG. 1, this hot air heater is, for example, an FF type gas hot air heater, and in a main body case 1 disposed in the room, an air passage 2 and an indoor space through the air passage 2. A blower fan 3 that is a blower that convects air and a combustion apparatus main body 4 that heats indoor air flowing through the blower passage 2 are provided.

  The combustion apparatus main body 4 includes a burner 5 as combustion means, a combustion chamber 6 in which the burner 5 is accommodated, and a heat exchanger 7 as heat exchange means connected to the combustion chamber 6. An air intake cylinder 8 is connected, and a combustion exhaust gas exhaust cylinder 9 serving as an exhaust means is connected via a heat exchanger 7. These intake cylinder 8 and exhaust cylinder 9 extend outside the main body case 1 and are led out outdoors. Further, the intake cylinder 8 is provided with a combustion fan 10 for supplying combustion air to the burner 5 in the combustion chamber 6, and the combustion fan 10 includes a rotary blade 11 provided rotatably in the intake cylinder 8. And a combustion fan motor 12 that rotationally drives the motor. The intake cylinder 8 and the combustion fan 10 constitute the intake means of the present invention.

  The burner 5 in the combustion chamber 6 is connected to a gas supply pipe 13 piped and introduced from the outside of the main body case 1, and fuel gas supplied from the gas supply pipe 13 is introduced into the combustion chamber 6 from the intake cylinder 8. The combustion air is mixed and burned. In the combustion chamber 6, an ignition electrode 14 for igniting the burner 5 and a flame detector 15 such as a frame rod or a thermocouple for detecting the flame of the burner 5 are arranged facing the burner 5. Has been.

  The gas supply pipe 13 is provided with two open / close electromagnetic valves 16 and 17 and a gas proportional valve 18.

  The air passage 2 has an air inlet 19 and an air outlet 20 on the back surface and the front surface of the main body case 1, respectively, and is formed via the heat exchanger 7 therebetween. An air filter 21 is attached to the intake port 19, and a louver 22 is attached to the air outlet 20 for adjusting the direction in which the hot air is blown out.

  The blower fan 3 includes a rotary blade 24 provided in the blower passage 2 facing the air inlet 19 of the blower passage 2 and a blower fan motor 25 that rotationally drives the blade. The blower fan 3 sucks room air into the blower passage 2 through the intake port 19 by the rotation of the rotary blades 24, and blows the sucked air through the heat exchanger 7 in the blower passage 2. The air flows toward 20 and blows into the room from the air outlet 20.

  Note that a room temperature sensor 26 that detects the temperature of room air that is sucked into the air passage 2 by the blower fan 3 as a room temperature is provided at a location facing the air inlet 19 in the air passage 2.

  With reference to FIGS. 1 and 2, the gas hot air heater of the present embodiment further controls the operation of the electromagnetic valves 16, 17, the gas proportional valve 18, the combustion fan motor 12, the blower fan motor 25, ignition. A controller 27 that is operated via the electrode 14, an operation switch 28 for the user to instruct operation start / stop, a retry operation setting switch 29 that sets execution of a retry operation to be described later, and a target room temperature for the combustion operation And an operating device 31 including a room temperature setting switch 30 for setting.

  As shown in FIG. 2, the controller 27 includes a combustion operation control means 32 (which includes a retry operation control means 33 described later) and a temperature control means 34 as function realizing means according to the present invention. I have.

  The temperature control means 34 sets the temperature set by the room temperature setting switch 30 as the target room temperature, and sets the burn amount (heating amount) of the burner 5 based on the difference between the target room temperature and the detected room temperature detected by the room temperature sensor 26. A combustion amount determining unit 35 for determining is provided.

  The combustion operation control unit 32 controls the combustion operation based on the combustion amount determined by the combustion amount determination unit 35 of the temperature adjustment control unit 34 when the operation start is instructed by the operation switch 28. That is, the combustion amount determination unit 35 changes the necessary combustion amount of the burner 5 from moment to moment according to the difference between the room temperature detected by the room temperature sensor 26 and the set room temperature for combustion operation by the room temperature setting switch 30 (target room temperature during combustion operation). The combustion operation control means 32 determines the supply amount of fuel gas to the burner 5 and the supply amount of combustion air to the burner 5 so that the burner 5 is combusted with the required combustion amount. And the blower fan motor 25 is controlled so that the air volume of the blower fan 3 corresponding to the required amount of combustion is obtained, whereby the temperature control operation of the hot air heater is performed.

  In addition, the combustion operation control means 32 can perform a forced strong operation that forcibly executes a combustion operation with a relatively high amount of heat and a forced weak operation that forcibly executes a combustion operation with a relatively low amount of heat.

  The retry operation control means 33 retries the ignition operation every time a predetermined time elapses until fuel gas is supplied in the case of misfiring due to a lack of gas during the combustion operation when the operation start is instructed by the retry operation setting switch 29. Control to do.

  Next, the operation of the hot air heater of this embodiment will be described. First, the basic operation during the combustion operation will be briefly described with reference to FIGS. 1 and 2. It is assumed that a desired target room temperature is set in advance by the room temperature setting switch 30 during the combustion operation. When an operation start command is given to the controller 27 by the ON operation of the operation switch 28 by the user, the controller 27 activates the combustion fan 10, and then causes the ignition electrode 14 to generate a spark discharge for a certain period of time and supply gas. The solenoid valves 16 and 17 and the gas proportional valve 18 of the pipe 13 are opened, and supply of a predetermined amount of fuel gas to the burner 5 is started, whereby ignition processing to the burner 5 is performed. And the ignition to the burner 5 is confirmed by the flame detector 15.

  In this way, after the burner 5 is ignited, the controller 27 controls the blower fan motor 25 to start the operation of the blower fan 3. As a result, room air is sucked into the air passage 2 via the air inlet 21, and the air thus sucked is heated by the combustion heat of the burner 5 in the process of flowing through the air passage 2 toward the outlet 20. Heated through the exchanger 7, it is blown out as hot air from the outlet 20.

  When the combustion of the burner 5 and the operation of the blower fan 3 are started in this way, the temperature control means 34 adjusts the combustion amount of the burner 5 according to the difference between the detected room temperature of the room temperature sensor 26 and the target room temperature, as described above. Then, the combustion operation control means 32 performs temperature control for controlling the combustion operation of the burner 5 and the air volume of the blower fan 3. In this case, basically, as the room temperature detected by the room temperature sensor 26 approaches the target room temperature, the combustion amount of the burner 5 is reduced, and the rotational speed of the blower fan 3 is reduced to reduce the blown amount of hot air. . Further, when the detected room temperature of the room temperature sensor 26 becomes lower than the target room temperature due to a change in the target room temperature or the like, the amount of combustion of the burner 5 is increased and the number of rotations of the blower fan 3 is increased so increase. Thereafter, when the operation switch 28 is turned OFF during such a combustion operation, the combustion operation is stopped.

  The above operation is a basic operation in the combustion operation of the hot air heater of the present embodiment. Further, in the hot air heater of the present embodiment, the retry operation control unit 33 performs the next retry operation control process. .

  Hereinafter, the retry operation control will be described. As shown in FIG. 3, first, the combustion operation control means 32 is controlled by the temperature control means 34 (STEP 1).

  Next, whether or not the burner 5 has misfired during the temperature control operation is determined based on the output of the flame detector 15 that detects the flame of the burner 5 (STEP 2).

  If NO in STEP 2 (when the burner 5 does not misfire during the temperature control operation), the temperature control operation is continued by the combustion operation control means 32. On the other hand, if YES at STEP 2 (when the burner 5 misfires during the temperature control operation), the temperature control operation is stopped by the combustion operation control means 32 (STEP 3).

  Thereafter, it is determined whether or not the difference between the target room temperature set by the room temperature setting switch 30 and the detected room temperature detected by the room temperature sensor 26 is equal to or higher than a predetermined temperature (N ° C.) (STEP 4). If NO in STEP 4 (if the difference between the target room temperature set by the room temperature setting switch 30 and the detected room temperature detected by the room temperature sensor 26 is not equal to or greater than a predetermined temperature), the target room temperature and room temperature sensor set by the room temperature setting switch 30 It waits until the difference with the detection room temperature detected by 26 becomes more than predetermined temperature.

  Next, in the case of YES in STEP 4 (when the difference between the target room temperature set by the room temperature setting switch 30 and the detected room temperature detected by the room temperature sensor 26 exceeds a predetermined temperature), the ignition electrode 14 ignites the burner 5. Ignition operation is executed (STEP 5).

  Then, whether or not the burner 5 is ignited by the ignition operation is determined based on the output of the flame detector 15 that detects the flame of the burner 5 (STEP 6).

  Thereafter, if YES in STEP 6 (when the burner 5 is ignited by the ignition operation), the forced strong operation is executed by the combustion operation control means 32 (STEP 7). On the other hand, when the determination is NO in STEP 6 (when the burner 5 is not ignited by the ignition operation), the retry operation of the ignition operation is executed.

  Next, it is determined based on the output of the flame detector 15 that detects the flame of the burner 5 whether or not misfiring has occurred during forced strong operation (STEP 8).

  If NO in STEP 8 (when the burner 5 does not misfire during forced strong operation), the process returns to STEP 1 to execute the temperature adjustment operation. If YES in STEP 8 (if the burner 5 misfires during forced strong operation), an ignition operation for igniting the burner 5 with the ignition electrode 14 is executed (STEP 9).

  Thereafter, whether or not the burner 5 is ignited by the ignition operation is determined based on the output of the flame detector 15 that detects the flame of the burner 5 (STEP 10).

  Next, in the case of YES in STEP 10 (when the burner 5 is ignited by the ignition operation), the forced strong operation is continued. On the other hand, if NO in STEP 10 (when the burner 5 does not ignite due to the ignition operation), a retry operation of the ignition operation is executed. First, it is determined whether or not a predetermined time has elapsed since the ignition operation (STEP 11).

  If NO in STEP 11 (when a predetermined time has not elapsed since the ignition operation), the process waits until a predetermined time has elapsed since the ignition operation. On the other hand, if YES in STEP 11 (when a predetermined time has elapsed from the ignition operation), an ignition operation for igniting the burner 5 with the ignition electrode 14 is executed (STEP 12).

  Thereafter, whether or not the burner 5 is ignited by the ignition operation is determined based on the output of the flame detector 15 that detects the flame of the burner 5 (STEP 13).

  Next, when the answer is NO in STEP 13 (when the burner 5 is not ignited by the ignition operation), the process returns to STEP 11 to determine again whether or not a predetermined time has elapsed since the immediately preceding ignition operation. On the other hand, if YES in STEP 13 (when the burner 5 is ignited by the ignition operation), the forced strong operation is executed.

  Then, the processing of STEP 11 to STEP 13 is repeated until YES is obtained in STEP 13 (until the burner 5 is ignited by the ignition operation).

  Note that the processing of STEP2 and STEP8 corresponds to the misfire determination means in the present invention. Further, the processing of STEP5, STEP9 and STEP12 corresponds to the ignition operation means in the present invention. Further, the processing of STEP 11 corresponds to the time measuring means in the present invention. Moreover, the processing of STEP6, STEP10, and STEP13 corresponds to the ignition determination means in the present invention. Further, the processing of repeating STEP 11 to STEP 13 corresponds to the retry means in the present invention.

  According to this embodiment, it is determined whether or not a predetermined time has elapsed since the time determining means determines that the ignition determining means does not ignite until it is determined that the ignition determining means has ignited. And a retry means for repeatedly igniting with an ignition operation means for performing an ignition operation when it is determined that the fuel has passed, so that if the fuel is misfired due to a lack of gas during the combustion operation while being absent in an extremely cold region, the fuel is When supplied, the combustion operation is resumed, so that the household goods can be prevented from freezing.

  In the above embodiment, the FF type heater that takes the combustion air from the outdoors by the combustion fan and forcibly exhausts it to the outdoors has been described. However, although not shown, the combustion air is taken from the room and the blower is used. For hot air heaters such as FE type heaters forcibly exhausting outdoors, CF type heaters for taking combustion air from indoors and exhausting them outdoors by natural ventilation using exhaust pipes, or gas fuel The present invention can be applied to a warm air heater that uses liquid fuel. Moreover, if it is a warm air heater which has a heat exchanger, the same effect can be acquired not only by a combustion type but by applying the freeze prevention operation control of this invention.

  DESCRIPTION OF SYMBOLS 1 ... Main body case, 2 ... Air flow path, 3 ... Air blower fan, 4 ... Combustion apparatus main body, 5 ... Burner, 6 ... Combustion chamber, 7 ... Heat exchanger, 8 ... Intake pipe, 9 ... Exhaust pipe, 10 ... Combustion fan DESCRIPTION OF SYMBOLS 11 ... Rotary blade, 12 ... Combustion fan motor, 13 ... Gas supply pipe, 14 ... Ignition electrode, 15 ... Flame detector, 16, 17 ... Open / close solenoid valve, 18 ... Gas proportional valve, 19 ... Intake port, 20 ... Air outlet, 21 ... Air filter, 22 ... Louver, 24 ... Rotating blade, 25 ... Blower fan motor, 26 ... Room temperature sensor, 27 ... Controller, 28 ... Operation switch, 29 ... Retry operation setting switch, 30 ... Room temperature setting switch, DESCRIPTION OF SYMBOLS 31 ... Operating device, 32 ... Combustion operation control means, 33 ... Retry operation control means, 34 ... Temperature control means, 35 ... Combustion amount determination part.

Claims (1)

Intake means for taking in outdoor air, combustion means for supplying and burning fuel gas supplied by the intake means, and exhaust means for exhausting combustion gas burned by the combustion means to the outside A heat exchange means provided in the exhaust means for conducting heat of the combustion gas to room air, a blower means for blowing the room air so that heat is conducted by the heat exchange means, and detecting a room temperature A warm air heater comprising a room temperature sensor, a room temperature setting switch for setting a target room temperature, and a combustion operation control means for controlling the operation of the combustion means,
The combustion operation control means is determined to have misfired by the misfire determination means for determining whether or not the combustion means has misfired during the combustion operation, the timing means for determining the elapse of a predetermined time, and the misfire determination means. Set by an ignition operation means for performing an ignition operation when it is determined that the predetermined time has elapsed from the time, an ignition determination means for determining whether or not the ignition operation means has ignited, and the room temperature setting switch When the difference between the target room temperature and the detected room temperature detected by the room temperature sensor is equal to or higher than a predetermined temperature and the ignition time determining means determines that the ignition time does not ignite, the time measuring means determines that a predetermined time has elapsed. possess a retry means for repeating the operation of the ignition by the ignition operation means until it is determined that the ignition by the ignition determining means,
When it is determined that the ignition determination unit has ignited by the retry operation, the combustion operation control unit forcibly executes a combustion operation having a relatively high amount of heat .

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