JP3345337B2 - Combustion hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a combustion type hot air heater such as a gas hot air heater.

[0002]

2. Description of the Related Art A combustor is accommodated in a main body case, such as a gas warm air heater, which is disposed indoors, and a combustion fan provided in the main body case draws room air into the main body case while burning the combustor. In a combustion-type hot-air heater that blows hot air heated by heat into a room, a room temperature is detected using a room temperature sensor, and the detected room temperature substantially matches a set room temperature set by a user or the like. The temperature control operation is performed as described above. In such a combustion type hot air heater, the temperature control operation controls the combustion amount of the combustor and the air volume of the blower fan, and furthermore, the room temperature rises above the set room temperature only by controlling the combustion volume and the air volume. In such a case, the extinguishing and reignition of the combustor are intermittently repeated (the extinguishing and reignition of the combustor are automatically repeated).

In this type of combustion type hot air heater, in the early stage of the combustion operation of the combustor, in order to stabilize the combustion of the combustor at an early stage, a predetermined period (for example, a predetermined constant time) from the time of ignition is set. ), A forced combustion operation for burning the combustor at its maximum combustion amount is performed. in this case,
The predetermined period is determined so that combustion of the combustor can be reliably stabilized regardless of various operating environments of the combustor or variations in the type of fuel or the fuel component. Such a forced combustion operation is performed not only at the time of ignition (at the start of heating operation) according to turning on of the operation switch of the hot air heater, but also at the time of re-ignition of the combustor in the temperature control control (at the time of combustion operation). At the time of resumption).

In such a conventional combustion type hot air heater,
At the time of ignition (at the start of heating operation) according to the turning on of the operation switch of the hot air heater, since the room temperature is generally low, the combustion of the combustor is performed early by performing the above-mentioned forced combustion operation of the combustor. Not only stabilization, but also room temperature can be raised quickly. However, at the time of reignition of the combustor in the subsequent temperature control operation (when restarting combustion), the room temperature is already close to the set room temperature, and at that time, the forced combustion operation of the maximum combustion amount is performed. This causes a disadvantage that the room temperature easily rises excessively with respect to the set temperature within the predetermined period.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves such inconveniences and provides a combustion-type hot air in which combustion and extinguishing of a combustor are intermittently repeated during a temperature control operation for making a room temperature substantially coincide with a set temperature. An object of the present invention is to provide a combustion-type hot-air heater capable of preventing a situation in which a room temperature excessively rises due to a forced combustion operation at the time of reignition of a combustor in the temperature control operation. And

[0006]

In order to achieve the above object, a first aspect of the combustion type hot air heater according to the present invention comprises a combustor housed in a main body case and indoor air supplied to the main body case. A blower fan for blowing hot air, which is heated by the combustion heat of the combustor while being sucked into the inside of the combustor, from the main body case, a room temperature detecting unit for detecting a room temperature, and instructing operation / stop of a heating operation to the combustor. An operation switch for performing ignition / extinguishing of the combustor, and a temperature control operation for intermittently repeating the extinguishing / reignition of the combustor so as to make the detected room temperature detected by the room temperature detecting means substantially coincide with a set temperature during the heating operation. Done,
And combustion control means for performing a forced combustion operation for burning the combustor with a predetermined amount of combustion for a predetermined time after re-ignition of the combustor by the temperature control control operation. The control means includes room temperature determination means for determining whether or not a room temperature detected by the room temperature detection means is equal to or higher than a predetermined temperature before a forced combustion operation corresponding to reignition of the combustor by the temperature control control operation. When the determination unit determines that the detected room temperature is lower than the predetermined temperature, the forced combustion operation is performed with the predetermined combustion amount as the maximum combustion amount of the combustor, and the room temperature determination unit sets the detected room temperature to the predetermined temperature. When it is determined that the above is the case, the forced combustion operation is performed with the predetermined combustion amount being a combustion amount smaller than the maximum combustion amount.

According to the present invention, during the re-ignition (when the combustion operation is restarted) in the temperature control operation in which the extinguishing and re-ignition of the combustor of the hot air heater are intermittently repeated, the forced combustion is performed. Before the operation, first, it is determined whether the room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature by the room temperature determining means. When the room temperature determining unit determines that the detected room temperature is lower than the predetermined temperature, the combustion control unit performs the forced combustion operation for the predetermined time at the maximum combustion amount, thereby stabilizing the combustion of the combustor at an early stage. And the room temperature can be raised quickly. On the other hand, when the room temperature determining means determines that the detected room temperature is equal to or higher than the predetermined temperature, it is considered that the combustion of the combustor can be stabilized early without performing the forced combustion operation at the maximum combustion amount for a predetermined time. Therefore, the combustion control means performs the forced combustion operation with the combustion amount smaller than the maximum combustion amount, so that an excessive rise in room temperature can be avoided.

Also, at the time of ignition in response to the turning on of the operation switch, the ignition switch may be accidentally turned off during the heating operation, and immediately after that, the operation switch may be turned on again. When the room temperature is already close to the set temperature and the room temperature is equal to or higher than the predetermined temperature, the room temperature rises excessively by the forced combustion operation, similarly to the reignition in the temperature control operation. Sometimes.

Therefore, the present invention relates to the combustion type hot air heater, wherein the combustion control means performs a forced combustion operation in which the combustor is burned at a predetermined combustion amount for a predetermined time after the ignition of the combustor by the operation switch. And performing room temperature determination means for determining whether a room temperature detected by the room temperature detection means is equal to or higher than a predetermined temperature before a forced combustion operation corresponding to ignition of the combustor by the operation switch. When it is determined that the detected room temperature is lower than the predetermined temperature, the forced combustion operation is performed with the predetermined combustion amount as the maximum combustion amount of the combustor, and the detected room temperature is determined by the room temperature determination means to be equal to or higher than the predetermined temperature. When it is performed, the predetermined combustion amount is set to a combustion amount smaller than the maximum combustion amount, and the forced combustion operation is performed.

According to the present invention, even before the forced combustion operation corresponding to the ignition of the combustor by the operation switch, the room temperature detected by the room temperature detecting means is compared with the predetermined temperature by the room temperature determining means. . As a result, when the room temperature determining means determines that the detected room temperature is lower than the predetermined temperature, such as when the operation switch is turned on for the first time, the combustion control means performs the forced operation for the predetermined time at the maximum combustion amount. By performing the combustion operation, the combustion of the combustor can be stabilized at an early stage, and the room temperature can be quickly raised. On the other hand, as in the case where the operation switch is accidentally turned off during the heating operation, and immediately after that, the operation switch is turned on again, the room temperature does not drop much from the set temperature, When it is determined that the detected room temperature is equal to or higher than the predetermined temperature, the combustion control means performs a forced combustion operation with a combustion amount smaller than the maximum combustion amount, so that an excessive rise in room temperature can be avoided.

Further, by performing the forced combustion operation with a combustion amount smaller than the maximum combustion amount, the combustion noise caused by the forced combustion operation can be made quieter than the case of the maximum combustion amount.

Next, a second aspect of the combustion type hot air heater of the present invention is a combustion type hot air heater having a combustor housed in a main body case and a combustion heat of the combustor while sucking room air into the main body case. A blower fan for blowing warm air heated by the main body case from the main body case, a room temperature detecting means for detecting a room temperature, an operation switch for instructing operation and stop of a heating operation to ignite and extinguish the combustor, During the operation, a temperature control operation in which fire extinguishing and re-ignition of the combustor are intermittently performed so that the detected room temperature detected by the room temperature detecting means substantially matches the set temperature, and the temperature control operation by the temperature control operation is performed. A combustion control means for performing a forced combustion operation for burning the combustor at the maximum amount of combustion for a predetermined time from reignition of the combustor, wherein the combustion control means comprises: Forced luck A room temperature determining means for determining whether or not the room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature. When the room temperature determining means determines that the detected room temperature is lower than the predetermined temperature, the predetermined time is counted as a second time. The forced combustion operation is performed as a first time, and when the detected room temperature is determined to be equal to or higher than the predetermined temperature by the room temperature determination means, the predetermined time is set as a second time shorter than the first time. Is performed.

According to the present invention, exactly the same as in the first aspect, at the time of re-ignition in the temperature control operation of the warm air heater, first, the room temperature is controlled before the forced combustion operation. The determining means determines whether the room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature. The determination is performed in exactly the same manner as in the first aspect, and when the room temperature determining unit determines that the detected room temperature is lower than a predetermined temperature, the combustion control unit sets the maximum combustion amount to the predetermined time. By performing the forced combustion operation for the first time, the combustion of the combustor can be stabilized at an early stage, and the room temperature can be quickly raised. On the other hand, when the room temperature determining means determines that the detected room temperature is equal to or higher than the predetermined temperature, the forced combustion operation is performed for the first time at the maximum combustion amount because the room temperature has not dropped so much from the set temperature. Even without this, it is considered that the combustion of the combustor can be stabilized early. Therefore, in such a case, the combustion control means avoids an excessive rise in room temperature by performing a forced combustion operation in which the predetermined time is the second time shorter than the first time at the maximum combustion amount. Can be.

Also, at the time of ignition in response to the turning on of the operation switch, the ignition switch is accidentally turned off during the heating operation, and immediately after that, the operation switch is turned on again. When the room temperature is already close to the set temperature and the room temperature is equal to or higher than the predetermined temperature, the room temperature rises excessively by the forced combustion operation, similarly to the reignition in the temperature control operation. Sometimes.

Therefore, the present invention provides the combustion type hot air heater, wherein the combustion control means performs a forced combustion operation in which the combustor is burned at a maximum combustion amount for a predetermined time after the ignition of the combustor by the operation switch. And performing room temperature determination means for determining whether a room temperature detected by the room temperature detection means is equal to or higher than a predetermined temperature before a forced combustion operation corresponding to ignition of the combustor by the operation switch. When it is determined that the detected room temperature is lower than the predetermined temperature, the forced combustion operation is performed with the predetermined time as a third time, and when the detected room temperature is determined to be equal to or higher than the predetermined temperature by the room temperature determination means, The forced combustion operation is performed by setting a predetermined time as a fourth time shorter than the third time.

According to the present invention, even before the forced combustion operation corresponding to the ignition of the combustor by the operation switch, the room temperature detected by the room temperature detecting means is compared with the predetermined temperature by the room temperature determining means. . As a result, when the room temperature determination unit determines that the detected room temperature is lower than a predetermined temperature, such as when the operation switch is turned on for the first time, the combustion control unit performs the predetermined time at the maximum combustion amount. By performing the forced combustion operation as the third time, the combustion of the combustor can be stabilized early,
Room temperature can be raised quickly. On the other hand, the room temperature determination unit determines that the detected room temperature is equal to or higher than the predetermined temperature, such as when the operation switch is accidentally turned off during the heating operation, and immediately after that, the operation switch is turned on again. In some cases, the combustion control means performs the forced combustion operation with the predetermined time being the fourth time shorter than the third time at the maximum combustion amount, so that an excessive rise in room temperature can be avoided.

[0017]

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a system configuration diagram of the hot air heater of the present embodiment,
FIG. 2 is a block diagram showing the configuration of the control unit shown in FIG. 1,
3 is a flowchart showing an ignition operation of the hot air heater shown in FIG. 1, FIG. 4 is a flowchart showing a first mode of operation of the hot air heater shown in FIG. 1, and FIG. 5 is a hot air heater shown in FIG. 6 is a flowchart showing a second mode of operation of the machine.

Referring to FIG. 1, the hot air heater of the present embodiment is, for example, a gas fan heater, and includes a duct 2, a blower fan 3, a gas burner (combustor) 4 in a main body case 1 disposed indoors. , A duct 5, a gas supply pipe 6, and a control unit 7 (combustion control means).

The duct 2 constitutes an air passage for hot air. The air inlet 8 for taking in the room air is opened at the back of the main body case 1, and the hot air outlet is provided at the lower front part of the main body case 1. 9 is open. In order to prevent dust and dirt from flowing into the duct 2, the air filter 1
0 is detachably attached. A movable louver 11 for adjusting the opening degree is attached to the outlet 9,
Gad motor 1 for driving this movable louver 11
2 are provided. In addition, the intake port 8 inside the duct 2
A room temperature sensor 13 (room temperature detecting means) constituted by a thermistor facing the air inlet 8 is attached to a nearby location, and the room temperature sensor 13 outputs a signal corresponding to the room temperature to the control unit 7.

The blower fan 3 has a fan motor 14 whose number of revolutions changes in proportion to the energizing current, and rotating blades 15 arranged in the duct 2 facing the air outlet 9 and driven to rotate by the fan motor 14. Then, the indoor air s is sucked into the duct 2 from the intake port 8 by the rotation of the rotary blade 15. Then, the sucked room air s is mixed with the combustion exhaust gas h of the gas burner 4 incorporated in the duct 2 and blown out as warm air m from the outlet 9 into the room. This blower fan 3
A rotation speed sensor 16 constituted by a Hall element or the like for detecting the rotation speed is provided. The rotation speed sensor 16 outputs a signal corresponding to the rotation speed of the fan motor 14 to the control unit 7.
Output to

Gas burner 4 incorporated in duct 2
Has an ignition electrode 19 for arranging a combustion plate 18 in a combustion cylinder 17 and igniting a mixture of combustion air and fuel gas.
Is disposed downstream of the combustion plate 18. The combustion cylinder 17 of the gas burner 4 is disposed in the duct 2, and the combustion exhaust h is discharged from the combustion cylinder 17 into the duct 2. A thermocouple 20 for detecting the presence or absence of a combustion flame is disposed downstream of the combustion plate 18.
An electromotive force is generated in a state where the electromotive force is exposed to the combustion flame of the gas burner 4, and the generated electromotive force is output to the control unit 7.

The duct 5 is a passage for supplying the indoor air s (combustion air) and the fuel gas to the gas burner 4, and communicates with the inside of the combustion cylinder 17 of the gas burner 4 and the duct 2
Is incorporated in the main body case 1 and the main body case 1
Has an air intake port 21 for room air s which is open at the back of the vehicle. A nozzle 22 attached to the tip of the gas supply pipe 6 is provided at a location on the gas burner 4 side of the duct 5. The indoor air s is sucked into the duct 5 from the intake port 21 by the rotation of the blower fan 3, and the sucked indoor air s is mixed with the fuel gas ejected from the nozzle 22 of the gas supply pipe 6. The mixture is supplied to the gas burner 4. The air inlet 21 is covered by the air filter 10 together with the air inlet 8 of the duct 2.

The gas supply pipe 6 is provided with electromagnetic valves 24 and 25 and an electromagnetic proportional valve 26 in this order from the upstream side. The solenoid valves 24 and 25 are opened by energization, and shut off the passage of fuel gas in a closed state where energization is stopped. The electromagnetic proportional valve 26 is a valve whose opening increases with the magnitude of the energizing current, and the energizing current is proportional to the amount of gas supplied to the gas burner 4.

An operation switch 2 is provided on the outer surface of the main body case 1.
7, a room temperature setting switch 28 and a filter lamp 29 are provided. The operation switch 27 has its ON / OFF
The operation instructs the control unit 7 to start or end the heating operation. The room temperature setting switch 28 is an operation switch for setting the room temperature, and instructs the control unit 7 by increasing or decreasing the set temperature T by, for example, 1 ° C. by a predetermined operation. The filter lamp 29 is controlled by the power supply control of the control unit 7 when the air volume at the time of the rotation operation of the blower fan 3 becomes smaller to some extent as compared with the normal operation, such as when the clogging of the air filter 10 is progressing. The air filter is turned on, and the user is notified of the necessity of cleaning the air filter 10 by the lighting.

Next, referring to FIG.
Is configured using a microcomputer or the like. The major functional components are roughly classified into a combustion control unit 30, a fan control unit 31, a room temperature determination unit 32 (room temperature determination unit), a timer 33, 34, 35 and 36 are provided.

The combustion control unit 30 is provided with instruction signals of the operation switch 27 and the room temperature setting switch 28 and the room temperature sensor 1
Based on the detection signals of the thermocouple 3 and the thermocouple 20, the ignition, extinguishing, and adjustment of the combustion amount of the gas burner 4 (adjustment of the supply amount of fuel gas)
For example, combustion control of the gas burner 4 is performed. In this case, in the present embodiment, during the combustion operation including the ignition operation of the gas burner 4, the combustion control unit 30 adjusts the combustion amount (fuel gas supply amount) of the gas burner 4 to the 1st to 12th speed (the 12th speed is the maximum combustion). (Corresponding to the amount).

The fan control unit 31 is provided with instruction signals for the operation switch 27 and the room temperature setting sensor 28 and the room temperature sensor 1
3. Based on the detection signals of the rotation speed sensor 16 and the thermocouple 20, the fan motor 14 is energized to control the rotation speed of the blower fan 3, thereby controlling the rotation of the blower fan 3 including the combustion air to the gas burner 4. Control the air volume. During the combustion operation including the ignition operation of the gas burner 4, the fan control unit 31 controls the blowing fan 3 according to the combustion amount of the gas burner 4.
Can be set in 12 stages of 1 to 12 speeds (12 speeds correspond to the maximum rotation speed of the blower fan 3 corresponding to the maximum combustion amount).

The combustion amount (fuel gas supply amount) of the gas burner 4 at each speed described above and the blowing fan 3 corresponding thereto
Is determined in advance. The control by the combustion control unit 30 and the fan control unit 31 is as follows.
The details are performed according to a predetermined sequence described later.

The room temperature determining unit 32 detects the detected room temperature t detected by the room temperature sensor 13 before starting the combustion operation of the gas burner 4 (ignition / reignition operation) or during the temperature control operation, and a room temperature setting switch. A comparison is made with a set temperature T which is a target temperature control temperature set by 28, and the result is given to the combustion control unit 30 and the fan control unit 31.

In the pre-purge prior to the start of the combustion operation of the gas burner 4, the timer 33 controls the combustion control unit 30 and the fan control unit 31 based on the output of the rotation speed sensor 16 based on the output of the rotation speed sensor 16.
Time for determining whether the rotation of the blower fan 3 is equal to or higher than the minimum rotation level (for example, 1
0 seconds).

When the gas burner 4 is ignited and re-ignited, the timer 34 controls the combustion control unit 30 and the fan control unit 31
Based on the output of the thermocouple 20, a time (for example, 30 seconds from the start of the ignition / reignition operation) for judging ignition / non-ignition of the gas burner 4 is measured. Further, the timer 34 performs the forced combustion operation after ignition / reignition of the gas burner 4 according to the determination result of the room temperature determination unit 32 (for example, 30 seconds).
Time.

In an initial state prior to the start of the combustion operation of the gas burner 4, the timer 35 is controlled by the combustion control unit 30 and the fan control unit 31 based on the output of the thermocouple 20.
A time for determining the normal / abnormal state of 0 (for example, 50 seconds after the operation switch 27 is turned on) is measured. Also,
The timer 35 measures the time (for example, 50 seconds) for performing the forced combustion operation after the ignition / reignition of the gas burner 4 according to the determination result of the room temperature determination unit 32.

The timer 36 measures the time (for example, 8 minutes) from the stop of the combustion operation due to the temperature control operation to the restart of the combustion operation of the gas burner 4.

Hereinafter, these timers 33, 34, 35,
36, 10-second timer 33 and 30-second timer 3, respectively
They are referred to as a 4, 50-second timer 35 and an 8-minute timer 36.

Next, a first mode of operation of the gas hot air heater according to the present embodiment will be described with reference to FIGS.

First, referring to FIG. 3, when the user turns on operation switch 27 to perform the heating operation (STE).
P1), and accordingly, the combustion control unit 30 of the control unit 7
Activates the 50-second timer 35 (STEP 2) and compares the output of the thermocouple 20 with a predetermined initial check level (for example, 10 mV) (STEP 3). If the 50-second timer 35 times out before the output of the thermocouple 20 falls below the initial check level (STEP 4), the output of the thermocouple 20 is abnormally stopped as an abnormal output. On the other hand, if the output of the thermocouple 20 becomes equal to or lower than the initial check level in STEP 2 before the time of the 50-second timer 35 expires, it is determined that the output of the thermocouple 20 is normal, and the process proceeds to STEP 5.

In STEP 5, the fan control unit 31 controls the energization of the fan motor 14 so that the blower fan 3 is operated at a predetermined rotation speed (for example, a rotation speed corresponding to the 12th speed) for a certain period of time. Pre-purge is performed. At the same time, the combustion control unit 30 activates the 10-second timer 33 and determines whether or not the rotation speed of the fan motor 14 is normal based on the output of the rotation speed sensor 16 (STE).
P6). Then, the rotation of the blower fan 3 indicated by the output of the rotation speed sensor 16 reaches the minimum rotation level (for example, 6 rpm).
If the time of the 10-second timer 33 has expired (STEP 7) before the time does not reach m) or more, the rotation of the blower fan 3 is stopped abnormally as an abnormal rotation. On the other hand, the 10-second timer 33
If the rotation of the blower fan 3 becomes equal to or higher than the minimum rotation level in STEP6 before the time has not elapsed, it is determined that the rotation of the blower fan 3 is normal, and the process proceeds to STEP8.

In STEP 8 after the pre-purge, the combustion control unit 30 energizes the solenoid valves 24 and 25 to open them, and controls the energization of the solenoid proportional valve 26 to supply the fuel gas supplied to the gas burner 4. Is equivalent to the eighth speed (medium combustion amount).
The energization of the ignition electrode 19 is controlled so as to generate a spark discharge. At the same time, the fan control unit 31 controls the energization of the fan motor 14 so as to continue to operate the blower fan 3 from the pre-purge, so that the number of revolutions of the fan motor 14 is equivalent to the eighth speed (medium rotation).

Next, the combustion control unit 30 has a 30-second timer
Is activated (STEP 9), and the output of the thermocouple 20 is compared with a predetermined ignition detection level (STEP 10).
If the 30-second timer 34 times out before the output of the thermocouple 20 reaches the ignition detection level (STEP 11), an error is stopped as an ignition error (non-ignition) by the ignition electrode 19. On the other hand, if the output of the thermocouple 20 becomes equal to or higher than the ignition detection level in STEP 10 before the 30-second timer 34 has timed out, it is determined that the ignition has been properly performed, and the energization to the ignition electrode 19 is stopped (STEP 12). ) To start the combustion operation, and then proceeds to STEP 13 in FIG.

In STEP 13, the room temperature determining section 32 of the control unit 7 compares the detected room temperature t of the room temperature sensor 13 with a predetermined temperature. If it is determined that the detected room temperature t is lower than the predetermined temperature, in STEP 14 the combustion control section 30 and fan control unit 3
1 performs the forced combustion operation for a predetermined time at the maximum combustion amount corresponding to the 12th speed. Also, in STEP 13, the room temperature determination unit 3
2 determines that the detected room temperature t is equal to or higher than the predetermined temperature, the combustion control unit 30 and the fan control unit 3 in STEP15.
The forced combustion operation is performed for a predetermined time at a medium combustion amount (for example, a combustion amount corresponding to the eighth speed) where 1 is smaller than the maximum combustion amount.

Here, the predetermined temperature is set to a lower limit temperature at which the room temperature rises excessively when the forced combustion operation is performed at the maximum combustion amount for a predetermined time, for example, a set temperature set by a room temperature setting switch 28. 2 ° C lower than T (T
-2). By doing so, if the detected room temperature t is equal to or higher than the predetermined temperature (T-2), an excessive rise in the room temperature can be avoided by performing the forced combustion operation for the predetermined time with the medium combustion amount, and t is a predetermined temperature (T
If it is lower than -2), the room temperature can be quickly raised by performing the forced combustion operation for the predetermined time at the maximum combustion amount.

In addition, the predetermined time can be ensured in the initial stage of the combustion operation of the combustor without fail irrespective of various operating environments of the combustor or variations in fuel type or fuel component. Is set to a time (for example, 50 seconds) at which can be stabilized early.

For example, the detected room temperature t is generally much lower than the set temperature T, such as when the combustion switch is started for the first time by turning on the operation switch 27. If it is determined to be lower than T-2), the flow proceeds to STEP14. STEP
When the forced combustion operation is started at 14, the combustion control unit 30 first controls the energization of the electromagnetic proportional valve 26 so that the fuel gas supplied to the gas burner 4 becomes equivalent to the 12th speed (maximum combustion amount). At the same time, the fan control unit 31 controls the energization of the fan motor 14 so that the rotation speed of the blower fan 3 becomes equivalent to the 12th speed (maximum rotation speed).

Next, the combustion control unit 30 sets the 50 second timer 34
Is activated (STEP 16), and the forced combustion operation based on the maximum combustion amount is continued until the 50-second timer 34 times out (STEP 17).

When the 50-second timer 34 times out and the forced combustion operation is completed, a temperature control operation is started (STEP 18). In the temperature control operation, the combustion control unit 30 and the fan control unit 31 operate the combustion of the gas burner 4 so that the room temperature t detected by the room temperature sensor 13 substantially matches the set temperature T set by the room temperature setting switch 28. The electromagnetic proportional valve 26 and the fan motor 14 are controlled so that the amount (the supply amount of the fuel gas) and the air volume (the number of rotations) of the blower fan 3 are gradually reduced from the 12th speed to the 1st speed, respectively (STEP 19). ). Then, the combustion control unit 30
(STEP 2) when the room temperature t detected by the room temperature sensor 13 becomes higher than a predetermined temperature (for example, T + 1 ° C.) exceeding the set temperature T set by the room temperature setting switch 28.
0), the temperature control of the electromagnetic proportional valve 26 and the fan motor 14 alone determines that the room temperature tends to rise excessively, and stops the combustion operation.
6 is operated (STEP 21).

When the combustion operation is stopped by the temperature control operation, the combustion control unit 30 subsequently operates the electromagnetic proportional valve 26.
Of the power supply to the solenoid valves 24, 2
The power supply to 5 is stopped and the valve is closed. At the same time, the fan control unit 31 controls the energization of the fan motor 14 so that the blower fan 3 is operated at a predetermined rotation speed (for example, a weak rotation corresponding to the first speed) for a certain period of time. Purge is performed, and then the energization of the fan motor 14 is stopped to stop the blower fan 3 (STEP 2).
2).

When the combustion operation is stopped as described above, the room temperature t detected by the room temperature sensor 13 gradually decreases. Therefore, the combustion control unit 30 monitors the room temperature t, and before the 8-minute timer 36 times out, the room temperature sensor 13
When the room temperature t detected in step (2) becomes lower than the set temperature T set by the room temperature setting switch 28 (STEP 23), the process returns to STEP 2 in FIG. Also, a room temperature sensor 1
Even if the room temperature t detected at 3 does not become lower than the set temperature T set by the room temperature setting switch 28, the 8-minute timer 36
When the time is up (STEP 24), the process returns to STEP 2 in FIG.

As a result, the operations of STEP 2 to STEP 24 are repeated, and as long as the room temperature t detected by the room temperature sensor 13 does not exceed the predetermined temperature (T + 1), the combustion controller 3
The temperature control operation of the electromagnetic proportional valve 26 and the fan motor 14 for gradually decreasing the combustion amount of the gas burner 4 (the supply amount of the fuel gas) and the air volume (the number of revolutions) of the blower fan 3 by the fan control unit 31 and the fan controller 14. When the room temperature t exceeds the predetermined temperature (T + 1), the combustion operation itself is turned ON / OF.
A temperature control operation is performed.

As in the case where the temperature control operation for turning ON / OFF the combustion operation itself is performed, the detected room temperature t is close to the set temperature T, and the room temperature judgment unit 32
If it is determined in STEP 13 that the detected room temperature t is equal to or higher than the predetermined temperature (T-2), the process proceeds to STEP 15. STEP
When the forced combustion operation is started at 15, the combustion control unit 30 first controls the energization of the electromagnetic proportional valve 26 so that the fuel gas supplied to the gas burner 4 becomes equivalent to the eighth speed (medium combustion amount). At the same time, the fan control unit 31
4 is controlled so that the rotation speed of the blower fan 3 is equivalent to the eighth speed (medium rotation speed).

Next, the combustion control unit 30 sets the 50 second timer 35
Is operated (STEP 16), and the forced combustion operation based on the medium combustion amount is continued until the 50-second timer 35 times out (STEP 17). At this time, since the temperature control operation has already been performed, STEP 18 is omitted, and the operations after STEP 19 are repeated.

In the present embodiment, even when the combustion is started by the ON operation of the operation switch 27, the heating operation is stopped for some reason, and immediately after that, the ON operation is performed again. If the detected room temperature t is close to the set temperature T,
In step 13, the room temperature determination unit 32 detects the room temperature t at a predetermined temperature (T−
2) If it is determined that the above is the case, in STEP15, the forced combustion operation with the medium combustion amount is performed. Conversely, even when the temperature control operation for turning ON / OFF the combustion operation itself is being performed, if the room temperature t detected by the room temperature sensor 13 suddenly drops due to environmental conditions or the like, the room temperature determination unit 32 determines in step 13 If it is determined that the detected room temperature t is lower than the predetermined temperature (T-2), a forced combustion operation based on the maximum combustion amount is performed in STEP14.

Further, in the warm air heater, the set temperature T may be changed by the room temperature setting switch 28 during the heating operation. In this embodiment, the room temperature determination unit 32 detects the detected room temperature t also in such a case. By comparing with the changed set temperature T, it is determined whether to perform the forced combustion operation at the maximum combustion amount or at the medium combustion amount.

In this embodiment, the operation switch 2
Irrespective of whether ignition is performed according to the injection of the fuel cell 7 or reignition in the temperature control operation, the room temperature determination unit 32 detects the room temperature t detected by the room temperature sensor 13 before the forced combustion operation. Is determined to be at or above a predetermined temperature (T-2). However, at the time of ignition in response to the turning on of the operation switch 27, the determination is not performed and the maximum combustion amount is unconditionally forced for a predetermined time. A combustion operation may be performed.

Next, a second mode of operation of the gas warm air heater of the present embodiment will be described with reference to FIGS.

In this embodiment, the user shown in FIG. 3 operates the operation switch 27 to perform the heating operation (STE).
From P1), the gas burner 4 is ignited and the ignition electrode 1
The operation before the power supply to the power supply 9 is stopped (STEP 12) is exactly the same as that in the first embodiment. The operation after the start of the temperature control operation (STEP 20) shown in FIG.
The operation after the start of the temperature control operation (STEP 18 in FIG. 4) is exactly the same. And in this embodiment,
Since the operations of STEPS 13 to 19 shown in FIG. 5 are different from those of the first embodiment, only the operations of STEPs 13 to 19 will be described.

In STEP 13 of FIG. 5, the control unit 7
The room temperature determination unit 32 compares the detected room temperature t of the room temperature sensor 13 with the predetermined temperature, and when it is determined that the detected room temperature t is lower than the predetermined temperature, the combustion control unit 30 and the fan control unit 31 Forcible combustion operation is performed for a first time (for example, 50 seconds) with the corresponding maximum combustion amount. Also,
When the room temperature determination unit 32 determines in step 13 that the detected room temperature t is equal to or higher than the predetermined temperature, in step 17, the combustion control unit 30 and the fan control unit 31 perform the forced combustion operation based on the maximum combustion amount. A second time shorter than the time (for example, 30 seconds) is performed.

Here, the first time is ensured in the initial stage of the combustion operation of the combustor without depending on the various operating environments of the combustor or the variation of the type of fuel or the fuel component. It is determined so that the combustion of the vessel can be stabilized early. Further, the predetermined temperature is set to a lower limit temperature at which room temperature rises excessively when the forced combustion operation is performed at the maximum combustion amount for the first time,
For example, the temperature is set to a temperature (T-2) lower by 2 ° C. than the set temperature T set by the room temperature setting switch 28. By doing so, the detected room temperature t becomes the predetermined temperature (T-2).
Above this, by performing the forced combustion operation for the second time at the maximum combustion amount, an excessive rise in room temperature can be avoided, and if the detected room temperature t is lower than a predetermined temperature (T-2), the maximum combustion amount By performing the forced combustion operation for the first time, the room temperature can be quickly raised.

As is the case when the combustion switch is started for the first time by turning on the operation switch 27, the detected room temperature t is generally much lower than the set temperature T, and the room temperature judgment section 32
When it is determined in step 13 that the detected room temperature t is lower than the predetermined temperature (T-2), the process proceeds to STEP14. When the forced combustion operation is started in STEP 14, first, the combustion control unit 30
Controls the energization of the electromagnetic proportional valve 26 so that the fuel gas supplied to the gas burner 4 becomes equivalent to the 12th speed (maximum combustion amount). At the same time, the fan control unit 31 controls the energization of the fan motor 14 to blow air. The rotation speed of the fan 3 is set to be equivalent to the 12th speed (maximum rotation speed).

Next, the combustion control unit 30 sets the 50 second timer 34
Is operated (STEP 15), and the forced combustion operation based on the maximum combustion amount is continued until the 50-second timer 34 times out (STEP 16).

When the 50-second timer 34 times out and the forced combustion operation ends, the temperature control operation starts (STEP 20). The operation after the start of the temperature control operation is exactly the same as in the first embodiment as described above.

Next, as in the case where the temperature control operation for turning ON / OFF the combustion operation itself is performed, the detected room temperature t is close to the set temperature T,
If it is determined in STEP 13 that the detected room temperature t is equal to or higher than the predetermined temperature (T-2), the process proceeds to STEP 17. S
When the forced combustion operation is started in TEP17, first,
The combustion control unit 30 controls the energization of the electromagnetic proportional valve 26 so that the fuel gas supplied to the gas burner 4 becomes equivalent to the 12th speed (maximum combustion amount). At the same time, the fan control unit 31 controls the energization of the fan motor 14. Then, the rotation speed of the blower fan 3 is set to be equivalent to the 12th speed (maximum rotation speed). Next, the combustion control unit 30 operates the 30-second timer 34 (STEP 30).
18) Until the 30-second timer 34 times out, the forced combustion operation based on the maximum combustion amount is continued (STE).
P19). At this time, since the temperature control operation has already been performed, STEP20 is omitted, and STEP2 is omitted.
The operations after 1 are repeated.

In this embodiment, even when the combustion is started by the ON operation of the operation switch 27, the heating operation is stopped for some reason, and immediately after that, the ON operation is performed again. If the detected room temperature t is close to the set temperature T,
In step 13, the room temperature determination unit 32 detects the room temperature t at a predetermined temperature (T−
2) If it is determined that the above is the case, the forced combustion operation based on the maximum combustion amount is performed for the second predetermined time in STEPs 17 to 19. Conversely, even when the temperature control operation for turning on / off the combustion operation itself is being performed, the room temperature determination unit 32 in STEP 13 may determine whether the room temperature t detected by the room temperature sensor 13 suddenly drops due to environmental conditions or the like. Determines that the detected room temperature t is lower than the predetermined temperature (T-2), STEP1
The forced combustion operation based on the maximum combustion amount of 4 to 16 is performed for the first predetermined time.

Further, in the warm air heater, the set temperature T may be changed by the room temperature setting switch 28 during the heating operation. In this embodiment, the room temperature determination unit 32 detects the detected room temperature t also in such a case. By comparing the changed combustion temperature with the changed set temperature T, it is determined whether the forced combustion operation based on the maximum combustion amount is performed for the first time or the second time.

In this embodiment, the operation switch 2
Irrespective of whether ignition is performed according to the injection of the fuel cell 7 or reignition in the temperature control operation, the room temperature determination unit 32 detects the room temperature t detected by the room temperature sensor 13 before the forced combustion operation. Is determined whether the temperature is equal to or higher than a predetermined temperature (T-2). However, at the time of ignition in response to the turning on of the operation switch 27, the determination is not performed and the predetermined time is unconditionally set to the maximum combustion amount. A forced combustion operation for one time may be performed.

In the first and second embodiments, the predetermined temperature is varied according to the set temperature. However, the predetermined temperature may be a fixed temperature.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a hot air heater according to an embodiment.

FIG. 2 is a block diagram showing a configuration of a control unit shown in FIG.

FIG. 3 is a flowchart showing an ignition operation of the warm air heater shown in FIG. 1;

FIG. 4 is a flowchart showing a first mode of operation of the warm air heater shown in FIG. 1;

FIG. 5 is a flowchart showing a first mode of operation of the hot air heater shown in FIG. 1;

[Explanation of symbols]

1 ... body case, 3 ... blower fan, 4 ... combustor,
7: combustion control means, 13: room temperature detection means, 27: operation switch, 32: room temperature determination means.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 1984-48459 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24H 3/04 305 F23N 5/00 F23N 5 / 02 350 F23N 5/20 103

Claims (4)

(57) [Claims] 1. A combustor housed in a main body case, a blower fan for blowing hot air generated by heating by combustion heat of the combustor from the main body case while sucking room air into the main body case, A room temperature detecting means for detecting a room temperature, an operation switch for instructing operation / stop of a heating operation to ignite / extinguish the combustor, and a detected room temperature detected by the room temperature detecting means during a heating operation to a set temperature. A temperature control operation is performed intermittently to repeat fire extinguishing and re-ignition of the combustor so as to substantially match, and the combustor is operated at a predetermined combustion amount for a predetermined time from the re-ignition of the combustor by the temperature control control operation. A combustion-type hot-air heater provided with combustion control means for performing a forced combustion operation for burning, wherein the combustion control means performs a forced combustion operation corresponding to re-ignition of the combustor by the temperature control control operation. Room temperature determining means for determining whether or not the room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature; and when the room temperature determining means determines that the detected room temperature is lower than the predetermined temperature, the predetermined combustion amount is determined by the combustor. When the detected room temperature is determined to be equal to or higher than the predetermined temperature by the room temperature determination means, the predetermined combustion amount is determined to be smaller than the maximum combustion amount, and the forced combustion operation is performed. Combustion-type hot-air heater characterized by being performed. 2. The combustion control means performs a forced combustion operation in which the combustor is burned with a predetermined amount of combustion for a predetermined time from the ignition of the combustor by the operation switch, and the ignition of the combustor by the operation switch. Before the forced combustion operation corresponding to the above, comprises a room temperature determining means for determining whether the room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature, and the room temperature determining means determines that the detected room temperature is lower than the predetermined temperature. Sometimes, the forced combustion operation is performed with the predetermined combustion amount as the maximum combustion amount of the combustor, and when the detected room temperature is determined to be equal to or higher than the predetermined temperature by the room temperature determination means, the predetermined combustion amount is determined by the maximum combustion amount. 2. The combustion type hot air heater according to claim 1, wherein the forced combustion operation is performed with a small amount of combustion. 3. A combustor housed in a main body case, and a blower fan for blowing hot air generated by heating by combustion heat of the combustor while sucking room air into the main body case, from the main body case. A room temperature detecting means for detecting a room temperature, an operation switch for instructing operation / stop of a heating operation to ignite / extinguish the combustor, and a detected room temperature detected by the room temperature detecting means during a heating operation to a set temperature. A temperature control operation in which the fire extinguishing and re-ignition of the combustor is intermittently performed so as to substantially coincide with each other, and the combustor is operated at the maximum combustion amount for a predetermined time from the re-ignition of the combustor by the temperature control control operation. A combustion control means for performing a forced combustion operation for burning, the combustion control means comprising: a forced combustion of the combustor corresponding to re-ignition of the combustor by the temperature control operation. Room temperature determining means for determining whether a room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature before the baking operation, and when the room temperature determining means determines that the detected room temperature is lower than the predetermined temperature, the predetermined time is used. Is performed as a first time, and when the room temperature determining means determines that the detected room temperature is equal to or higher than the predetermined temperature, the predetermined time is set as a second time shorter than the first time. A combustion-type hot air heater characterized by performing a combustion operation. 4. The combustion control means performs a forced combustion operation in which the combustor is burned at a maximum combustion amount for a predetermined time from the ignition of the combustor by the operation switch, and the ignition of the combustor by the operation switch. Before the forced combustion operation corresponding to the above, comprises a room temperature determining means for determining whether the room temperature detected by the room temperature detecting means is equal to or higher than a predetermined temperature, and the room temperature determining means determines that the detected room temperature is lower than the predetermined temperature. In some cases, the forced combustion operation is performed with the predetermined time as a third time, and when the detected room temperature is determined to be equal to or higher than the predetermined temperature by the room temperature determining means, the predetermined time is set to a fourth time shorter than the third time. 4. The forced combustion operation is performed as time.
The combustion-type hot air heater described.