JP2566046B2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention has a casing in which a heating source and a blower are arranged,
The present invention relates to a warm air heater control device that controls a heating source and a blower according to a target heating amount.

[Prior Art] In a warm air heater, the heating amount of a heating source and the blowing amount of a blower are appropriately controlled to each other, and a warm air of an appropriate temperature is blown out.

Such blowers are driven by a motor whose rotation speed changes easily by changing the applied voltage, and the blower is changed by changing the applied voltage to the motor in accordance with the heating amount of the heating source. Has been changed.

On the other hand, recently, it has been desired to increase the heating capacity so that sufficient heating can be performed even when the heating load in a relatively large room or the like is large. On the other hand, the heating load in a room or the like that can obtain such a large heating capacity and is not so wide When is small, it is desired that the heating amount is sufficiently limited so that excessive heating is not performed.

[Problems to be Solved by the Invention] However, in a blower in which a fan is driven by a motor, when the blower duct is constant, the rotational speed characteristic with respect to the voltage applied to the motor has a constant relationship. If the maximum heating amount of the heating source is increased according to demand and the heating amount of the heating source can be changed in a wide range from small heating amount to large heating amount, the applied voltage to the blower is changed accordingly. Then, when the rotation speed is changed from the low rotation speed to the high rotation speed, when the heating amount is large, the air blowing amount becomes large, and when the heating amount is small, the air blowing amount becomes small.

Therefore, when the amount of blown air is small, the warm air blown out from the warm air outlet is weak and difficult to reach a long distance, and warm air easily stagnates near the warm air heater.

As described above, when the blower operates at a low rotational speed, there are two cases, that is, the indoor temperature gradually increases and the heating amount decreases, and the indoor temperature gradually decreases. In the former case, if the hot air easily hits the user, it is easy to feel as overheating, and even if there is stagnation of the hot air, it is unlikely that the heating is insufficient. If the wind does not act effectively on the user, it becomes easy to feel insufficient heating.

An object of the present invention is to provide a wide range of required heating amount from a small heating amount to a large heating amount, and to provide an appropriate heating effect according to the change in the room temperature.

[Means for Solving the Problems] According to the invention of claim 1, the present invention provides a blower and a heating source in a casing having an indoor air intake and a hot air outlet, and detects the temperature by a temperature detecting means. While controlling the heating amount of the heating source based on the room temperature to be performed, in a warm air heater controlling the blower according to the heating amount, the warm air outlet of the warm air outlet according to the heating amount of the heating source. A damper that opens and closes a part is provided, and when the heating amount is less than or equal to a first reference heating amount, the damper is closed and the heating amount is the first
The opening operation of the damper is performed when the second reference heating amount is set to be larger than the reference heating amount, and the difference between the first reference heating amount and the second reference heating amount is set to the heating amount. The technical means is to increase the change of

[Operation and Effect of Invention] <Operation and Effect of Invention> In this invention, the blower is controlled according to the heating amount of the heating source controlled based on the room temperature.

On the other hand, the damper provided at the hot air outlet from which the hot air of the heating source is blown out is closed when the heating amount of the heating source becomes equal to or lower than the first reference heating amount, and the damper is opened from the first predetermined heating amount. The opening operation is performed when the second reference heating amount that is set to a large value or more is reached.

Therefore, when the heating amount is sufficient and the heating amount of the heating source becomes small and becomes equal to or less than the second reference heating amount when the indoor temperature gradually rises, the damper remains in the open state and Only the air flow is reduced. The warm air blown at this time is weak, but in this case, the entire room is warm and the weak warm air does not warp and does not make the user feel the warm air, so a moderate heating effect can be provided. .

As a result, even if the heating effect of the warm air does not directly act on the user, there is no sense of insufficient heating.

When the room temperature further rises and becomes less than or equal to the first heating amount, the blowing amount of the blower further decreases, but at this time, the damper is closed and a part of the hot air outlet is closed. . Therefore, since the warm air is blown out from the limited opening of the warm air outlet, the amount of warm air decreases, the warm air temperature rises, and the wind speed becomes strong.

Therefore, the warm air effectively acts on the user to give a proper heating feeling, and it is difficult for the user to feel insufficient heating.

On the contrary, the indoor temperature gradually decreases due to insufficient heating,
When the heating amount increases and becomes equal to or more than the first reference heating amount, the damper remains in the closed state, so the amount of warm air by the blower is smaller than that in the case where the damper is open, and the warm air temperature is It becomes higher and the warm air becomes stronger.

Therefore, the warm air effectively acts on the user, and it is difficult for the user to feel the decrease in the indoor temperature.

When the indoor temperature further decreases and the heating amount exceeds the second reference heating amount, the heating amount of the heating source increases and the blowing amount of the blower increases, and at this time, the damper is opened. Therefore, sufficient warm air is blown out.

In the above operation, since the difference between the first reference heating amount and the second reference heating amount is large with respect to the change in the heating amount of the heating source, the heating amount of the heating source is constant. When the indoor temperature stabilizes at a certain temperature in the vicinity, and when the heating amount changes slightly around a constant heating amount, the change causes unnecessary movement such that the damper repeats opening and closing operations. There is nothing to do.

EXAMPLES Next, the present invention will be described based on examples.

In the stationary gas warm air heater 1 shown in FIGS. 2 and 3, the outer casing 2 is formed of several members made of a metal plate and resin, and each of the outer casing 2 has a plurality of openings. The indoor air intake 3 and the combustion air suction port 4 are provided above the rear surface, and the warm air blowing port 5 that blows out warm air is provided below the front surface. The indoor air intake 3 and the suction port 4 are located outside. It is covered with a filter 6 which is detachably attached to the casing 2.

Inside the outer casing 2, as shown in FIG.
A convection duct 7 is provided, and in the vicinity of the warm air outlet 5 in the convection duct 7, a through-flow type convection fan 8 having the convection duct 7 as a blowing casing is arranged, and the suction port 4 and the warm air outlet 5 are They are the upstream end and the downstream end of the convection duct 7, respectively.

The convection fan 8 drives the impeller 8a arranged in the convection duct 7 by the motor 8b.

The warm air blowout port 5 is provided with a damper 9 for closing a part of the warm air blowout port 5, and rotates according to an operating state to control the blowout state of the airflow passing through the convection duct 7.

Here, when the damper 9 closes a part of the warm air outlet 5, as shown in FIG. 5, it closes the upper half of the warm air outlet 5 and opens the warm air outlet 5. Is the sixth
As shown in the drawing, the hot air outlet 5 is opened outward so as to come into close contact with the upper end surface of the hot air outlet 5.

The opening / closing mechanism of the damper 9 will be described below with reference to FIGS.

FIG. 8 shows a member and a damper 9 which constitute the vicinity of the warm air outlet 5 of the outer casing 2, and the damper 9 is rotatably supported by a rotating shaft (not shown) on the back side of the warm air outlet 5. A drive rod 91 for opening and closing is provided.

On the other hand, the damper 9 is provided with a gad motor 9a, which is composed of a motor and a speed reduction mechanism, as a driving means in close proximity thereto, and an output member 92 is fixed to an output shaft 9b which is rotationally driven in one direction.

As shown in FIGS. 9 and 10, the output member 92 includes a disc portion 92a and an output rod portion 92b, and the output rod portion 92b includes:
A connecting plate 93 connected to the drive rod 91 is connected.

When the gad motor 9a is driven and the output shaft 9b is rotated by the above-described opening / closing mechanism, the disk portion 92a of the output member 92 is rotated accordingly, and the output rod portion 92b is rotated.

As a result, the connecting plate 93 substantially reciprocates according to the displacement of the output rod portion 92b, and the drive rod 91 drives the damper 9 to open and close,
The opening area of the hot air outlet 5 is changed.

On the other hand, on the outer side of the disk portion 92a of the output member 92, a position sensor 94 which is made up of a micro switch and detects the open state of the damper 9 and a position sensor 95 which detects the closed state thereof are provided in close proximity to each other in the axial direction. In the disk portion 92a, a detection concave portion 92c for detecting a closed state in a portion corresponding to each detection portion 94a, 95a of the position sensors 94, 95, and a detection recess (not shown) for detecting an open state. And a recess is formed.

As a result, in FIG. 9, the position sensor 94 is in the open detection state in which the detection unit 94a is located in the detection recess 92c and detects the open state of the damper 9, and the detection units 94a and 95a are disc-shaped.
When contacting the outer peripheral surface of 92a, the position sensors 94 and 95 are in the non-detection state in which the respective states are not detected.

A burner 10 as a heating source is arranged on the upstream side of the convection fan 8 in the convection duct 7, and the high-temperature combustion gas generated in the burner 10 is accompanied by the operation of the convection fan 8 and the indoor air intake 3 The hot air is mixed with the indoor air taken in to form warm air and is blown out from the warm air outlet 5.

A nozzle 13 that is a downstream end of a fuel supply path 12 that guides the fuel gas is arranged in an air guide tube 11 that guides the combustion air from the suction port 4 to the burner 10. The fuel gas ejected from the nozzle 13 is used for combustion. The burner 10 is guided to the mixing chamber 14 together with the air.
Burns at.

The fuel supply path 12 is provided with two solenoid valves 15 and 16 and a gas governor 17 for making the supply gas pressure constant in order from the upstream side, and the fuel supply path 12 is provided downstream of the gas governor 17 with a main pipe 12a.
To the two bypass pipes 12b and 12c, and the main pipe 12a and the two bypass pipes 12b and 12c are merged again to form the nozzle 13
Is connected to

The main pipe 12a is provided with a proportional valve 18 for adjusting the fuel gas amount, and the bypass pipe 12b is provided with a gas amount adjusting screw 19 for adjusting the minimum supply amount of the fuel gas.

The bypass pipe 12c supplies the fuel gas in a predetermined amount (for example, a predetermined amount) in order to perform quick heating (hot dash) in the initial operation.
It is an auxiliary fuel supply path for increasing the amount by only 15%) and is provided with a bypass solenoid valve 20 which is opened only in the initial stage of operation.

An ignition electrode 21 for performing spark discharge for addition and a thermocouple 22 for monitoring the combustion state of the burner 10 are provided near the burner 10.

In addition, a thermistor 23 that detects the indoor temperature is provided in the suction port 4.

On the upper surface of the outer casing 2 of the gas warm air heater 1 configured as described above, an operation switch 24 for instructing start and stop of operation and a resin opening / closing lid 25 are covered to perform various operations described later. A plurality of switches for operation and an operation display unit containing the display device 26 are provided, and the gas warm air heater 1 is controlled by the control device 30 shown in FIG. It

The control device 30 includes a microcomputer having various input / output circuits (hereinafter referred to as “microcomputer”) and a drive circuit for driving each part of the gas warm air heater 1 by the microcomputer. The mode control unit 31 and the display control unit 3 are the functional units formed by
2. There are a setting control unit 33, an operation control unit 34, a capacity determination unit 35, a proportional valve control unit 36, a fan control unit 37, and a damper control unit 38.

Further, as an operation switch for giving an operation signal to the control device 30, in addition to the operation switch 24 described above, a display changeover switch 41, a time setting switch 42, a setting switch 43 consisting of two switches, and two ON timer switches 44. , 45, off timer switch 46, and save operation switch 47.

The operation purpose of each switch and the control content of each functional unit according to the operation of each switch will be described below.

The mode control unit 31 is a functional unit for setting the operation mode of the gas warm air heater 1 and the display mode of the display device 26. The mode control unit 31 includes connector terminals 51 and 52 on a control board (not shown). The operation mode or display mode is changed as follows according to the conduction state of the external circuit connected to each connector terminal 51, 52.

The connector terminal 51 has at least two connection pins, and when a short circuit is made between the pins of the connector terminal 51 by a predetermined connector or the like that matches the connector terminal 51, the mode control unit 31 puts the capability determination unit 35 in the step mode. When the control is performed and the pins of the connector terminal 51 are not short-circuited, the capability determining unit 35 is controlled to the temperature control mode.

The mode control unit 31 displays the display device in the temperature control mode.
Regarding 26, the temperature display mode and the time display mode are switched according to the operation signal from the display changeover switch 41, and the setting mode by the setting switch 43 is determined in synchronization with the switching of each display mode.

The connector terminal 52 includes, for example, four connection pins. When the mode control unit 31 short-circuits the pins of the connector terminal 52 with a predetermined connector or the like matching the connector terminal 52, the mode control unit 31 responds to the short-circuit state of each connection pin. The display control unit 32 is controlled to the inspection mode.

In this case, the connector that matches the connector terminal 52,
A changeover switch for forming a predetermined short circuit between the pins is provided in advance, and the required inspection mode can be easily selected.

The display control unit 32 selects the display content of the display device 26 according to the control state of the mode control unit 31, and displays the selected display content as follows.

In this embodiment, a 4-digit 7-segment LED is provided as the display device 26, which corresponds to the numbers "0" to "9" and the alphabets "A" to "F". Display characters.

In the case of the temperature control mode, the temperature display mode and the time display mode are switched according to the switching signal from the display changeover switch 41, the set temperature and the detected temperature are set in the temperature display mode, and the time setting switch 42 is set in the time display mode. The selected current time or set time is displayed.

In the case of the step mode, the capacity level corresponding to each heating capacity is displayed according to the heating capacity selected by the setting switch 43.

In the inspection mode, for example, the thermistor 23 for each inspection mode according to the short-circuit state of each pin of the connector terminal 52.
Detected temperature, control value for convection fan 8, proportional valve
The control instruction value to 18, the correction value to the convection fan 8 by each variable resistor 37a, 37b described later, the correction value to the proportional valve 18 by the variable resistor 36a, the output of the thermocouple 22, the set time of the timer, etc. , Is displayed according to the operation of each switch provided in the operation display unit.

Further, the display device 26, an LED for displaying operation, combustion or hot dash, other, LED for displaying the selected state of the time adjustment switch 42, the operation state of each timer switch 44-46 and the save operation switch 47, further, An LED is provided that blinks when clogging of the filter 6 is detected by a filter switch (not shown).

The setting control unit 33 is a functional unit that controls the setting content of the setting switch 43 according to the setting mode.In the temperature control mode, the setting control unit 33 operates in the temperature display mode according to the display mode selected by the display changeover switch 41. The set temperature is set, and in the time display mode, the time selected by the time setting switch 42 is set.

The set temperature to be set is “L (corresponding to about 10 ° C.)”, “16”, “18”, ..., “26”, “H (for continuous strong operation)”, and 8 at 2 ° C. intervals. There are stages.

Further, the setting control unit 33 mainly fixes (locks) the set temperature.
There is a lock function to perform two setting switches 43
When is operated at the same time and the operation time continues for 0.5 seconds or more, the set temperature or the like is fixed, and the lock lamp of the display device 26 indicates that it is being fixed.

If the set temperature is fixed, set switch 43
The set temperature does not change even if one of the two is operated.

When the set temperature is fixed, the operation switch 24 and each timer switch
The operation for starting operation by ~ 46 will not be accepted.

If two setting switches 43 are simultaneously operated for 0.5 seconds or more during fixing, the fixing is released and the operation of each switch is accepted again.

The operation control unit 34 performs the operation start control in a predetermined sequence in accordance with the operation signal of the operation switch 24, and controls the burner.
The ignition control of 10 is started, and during combustion, the operation stop control is performed according to the operation signal of the operation switch 24, and predetermined digestion control is performed.

Further, following the ignition control, ignition detection by the thermocouple 22 is performed, and when the output voltage of the thermocouple 22 exceeds a certain voltage, it is determined as the ignition detection state.

Further, during combustion, whether or not normal combustion is performed is determined by whether or not the output voltage of the thermocouple 22 is equal to or higher than a predetermined voltage.

In the present embodiment, when the heating capacity determined by the capacity determining unit 35, which will be described later, is level 2 or less, 10 mV is used as the reference voltage, and when the heating capacity is levels 3 to 8, 14 mV is used as the reference voltage. The output voltage of the couple 22 is compared with the reference voltage. If the output voltage is less than the reference voltage, it is discriminated as an oxygen-deficient combustion state or a misfire state, and fire suppression control is performed.

Further, in this embodiment, the timer 34a having a clock function is used.
Is provided, and the operation control is performed not only by the operation of the operation switch 24 but also by the operation of each of the timer switches 44 to 46.

When each ON timer switch 44, 45 is operated, the operation start operation precedes the time before the set time so that the room temperature becomes the set temperature at the preset time set in the timer 34a. Done.

When the off timer switch 46 is operated, the operation start control is performed together with the operation of the off timer switch 46 even if the operation start operation by the operation switch 24 is not performed.

Here, when the operation is performed by each of the timer switches 44 to 46, a predetermined time (for example, 60 minutes) is set as the operation continuation time, the timer 34a is activated, and the operation stop control is automatically performed when the predetermined time elapses. To end the operation.

If the off timer switch 46 is once operated and then operated again, the timer 34a is reset,
From that time, the operation is continued for a predetermined time.

On the other hand, each set time for performing timer operation control according to each ON timer switch 44, 45 is stored in a storage device provided in association with the timer 34a, and is set by the time setting switch 42. It is stored in each storage device selected corresponding to the ON timer switches 44 and 45.

When the above-described fixing is performed, the operation control unit 34 does not accept the operation for starting the operation by the operation switch 24 and each of the timer switches 44 to 46.

Therefore, if it is fixed during operation, the operation switch
If only the operation for stopping the operation by 24 is accepted and it is fixed during the stop, the ON timer switch 44,
Only when the timer operation control by 45 is performed, the operation is started prior to the set time, and when the timer operation control is not performed, the operation is not started at all unless the fixation is released. .

In the operation start control, the pre-purge is performed for 3 seconds and then the burner 10 is ignited, and in the operation stop control, the post-purge is performed for about 20 seconds after the burner 10 is extinguished.

The capacity determining unit 35 determines the heating capacity as a reference for determining the combustion amount of the burner 10 and the applied voltage of the convection fan 8.
Set according to the operation of the switch 43.

In the present embodiment, as the heating capacity, level 1 is the weakest heating capacity, and level 8 is the largest heating capacity.
In the temperature control mode, the heating capacity is determined from the temperature difference between the temperature set by the setting switch 43 and the temperature detected by the thermistor 23, as shown in FIG. 7. However, when the set temperature is set to "L" or "H", respectively, the heating capacity is determined to be level 8 or level 1 regardless of the detected temperature.

In the step mode, the heating capacity is selected according to the operation of the setting switch 43 regardless of the temperature detected by the thermistor 23.

In addition, the capacity determination unit 35 is provided with a save operation switch 47 for preventing overheating according to the user's request. When the save operation switch 47 is operated during operation, a save operation not shown is shown. As the lamp lights up,
For example, every 30 minutes after the temperature detected by the thermistor 23 reaches the set temperature, the set temperature is changed by 1 ° C. to be lowered.

As a result, if the room is sufficiently heated to the set temperature, the actual set temperature will gradually become lower than the apparent set temperature. There is no need to change it, and the consumption of fuel gas can be suppressed.

At the beginning of operation, level 4 is determined to facilitate ignition of the burner 10, and when ignition is detected, level 8 is determined for a predetermined time (15 minutes) thereafter. , The bypass solenoid valve 20 is simultaneously opened to perform rapid heating (hot dash) operation, and after a predetermined time has elapsed, the rapid heating (hot dash) operation ends and the set temperature and the temperature detected by the thermistor 23 are reached. The heating capacity is determined based on this.

The proportional valve control unit 36 drives and controls the proportional valve 18 according to the heating capacity determined by the capacity determination unit 35. Here, in order to ensure that the current value corresponding to the determined heating capacity is energized, a variable resistor that is manually adjusted.
36a is provided, and the proportional valve 18 is driven based on a control value obtained by combining the correction value given by the variable resistor 36a and the determined heating capacity.

The fan control unit 37 drives and controls the convection fan 8 according to the heating capacity determined by the capacity determination unit 35. Here, in order to drive at the number of revolutions corresponding to the determined heating capacity,
Variable resistors 37a and 37b adjusted by manual operation are provided, and as shown in FIG. 11, when the determined heating capacity is level 1 or 2, it is determined as the correction value given by the variable resistor 37a. The voltage between solid line A and solid line B is applied on the basis of the combined control value of the heating capacity and the heating capacity determined with the correction value given by the variable resistor 37b in the case of levels 3-8. The voltage between the solid line C and the solid line D is applied to the motor of the convection fan 8 on the basis of the combined control value.

As a result, even if the motor of the convection fan 8 varies, an appropriate voltage corresponding to the control value is applied, and an optimum rotation speed from a high rotation speed to a low rotation speed is obtained corresponding to each level. Appropriate air is circulated with respect to the heating amount of the burner 10, and a warm air temperature and a warm air amount that are comfortable for the user are secured.

The damper control unit 38 is a functional unit for driving and controlling the gad motor 9a provided in the damper 9, and according to the control state of the operation control unit 34 at the time of operation start and operation stop, and during operation, the capacity determination unit. Each is controlled according to the heating capacity determined by 35.

Here, the closed state is controlled at the beginning of the operation, and the opening area of the hot air outlet 5 is reduced. Therefore, while the heating capacity determined by the capacity determining unit 35 is level 4 and the fuel gas corresponding to the level 4 is supplied, the supply amount of the combustion air relatively decreases, so that the mixing is performed. Qi becomes gas rich, which makes ignition easier.

The damper 9 is opened in response to rapid heating within a predetermined time after the ignition of the burner 10 is detected.

After the rapid heating is completed, the damper 9 is used as a capacity determination unit.
It is opened or closed depending on the heating capacity determined by 35.

Here, the opening operation is performed when the heating capacity is equal to or higher than level 3, and the closing operation is performed when the heating capacity is equal to or lower than level 1.

That is, as shown in FIG. 12, level 1 is always closed, level 3 or higher is always open, and level 2 is when the heating capacity changes from level 3 or higher to level 2. The open state is maintained as it is, and conversely, when the heating capacity changes from level 1 to level 2, the closed state is maintained as it is.

On the other hand, in the post-purge of the operation stop control, the amount of air that is maintained in the open state and passes through the convection duct 7 is increased so that the burner 10 and the convection duct 7 can be rapidly cooled, and the post-purge is closed. Driven to the state.

As a result, when the ignition operation is performed, it is not necessary to close it again, and the operation start operation such as pre-purge can be promptly started.

Here, the open state and the closed state of the damper 9 are detected by the position sensors 94 and 95 including two micro switches provided in the drive unit of the gad motor 9a, and the control instruction value and the position sensors 94 and 95 are detected. The gad motor 9a is driven when the detected state is different from the above, and the gad motor 9a is not driven when the control instruction value and the detected state match.

In addition, when the position sensors 94 and 95 are out of order, the control instruction value and the detection state may never match. In such a case, the gad motor 9a is unnecessarily driven, and the combustion state of the burner 10 becomes unstable. Therefore, in order to protect the gad motor 9a and the damper 9 and ensure safety, The drive time of the gad motor 9a is limited to 20 seconds at maximum,
No further driving is performed and the operation is stopped after 20 seconds.

Further, even when the open state and the closed state are detected at the same time, the operation is stopped after 20 seconds.

In this embodiment, when the damper 9 is driven, the state change is normally completed in 5 to 6 seconds.

Hereinafter, the operation of the damper control unit 38 for instructing the state of the damper 9 will be described according to the operating state of the gas warm air heater 1 shown in FIG.

When the operation start operation is performed by the operation switch 24 (YES in step 1), predetermined ignition control is performed (step 2).

In this ignition control, the closed state of the damper 9 is instructed.

When ignition is detected by the thermocouple 22 within a predetermined time after ignition control (YES in step 3),
The damper 9 is instructed to be opened, and the bypass solenoid valve 20 is opened for rapid heating (hot dash) to perform the forced strong operation (step 4), after which the temperature control is started (step 5). ), Until operation is stopped (NO in step 6).

In the temperature control, the state of the damper 9 is instructed according to the heating capacity level determined by the capacity determining unit 35.

On the other hand, if ignition is not detected within the predetermined time despite the ignition control being performed (N in step 3
O), abnormal stop (step 7), and display that effect.

After that, when the operation for stopping the operation is performed by the operation switch 24 (YES in step 6), the solenoid valves 15, 16 are closed by the fire extinguishing control (step 8), and the post-purge is started (step 9). .

In this fire extinguishing control and post purge, the damper 9 is maintained in the open state.

Therefore, since sufficient air passes through the convection duct 7 heated by the burner 10, the cooling effect is great and the convection duct 7 is quickly cooled.

After the post-purging is completed (YE
S), the damper 9 is closed (step 11), and when the closed state is detected, the damper standby state is entered and the next operation start operation is awaited (step 1).

Next, the control of the state instruction of the damper 9 in the temperature control control of step 5 will be described with reference to FIG.

In this temperature control, the current level of the heating capacity determined by the capacity determination unit 35 is compared with the previous level, and if this level does not change from the previous level (step 21
In “=”), the state of the damper 9 is not changed and the state is continued.

If the current level is lower than the previous level (“<” in step 21), it is determined whether or not the current level is lower than 2 and if the current level is lower than 2 (YES in step 22) ), The closed state is instructed (step 23), and when the current level is greater than 2 (NO in step 22), the state change of the damper 9 is not instructed and the open state up to that point is maintained.

In step 21, if the current level is higher than the previous level (“>”), it is determined whether or not the current level is 3 or higher. If the current level is 3 or higher (YES in step 24). ) And indicate the open state (step 2
5) If the current level is less than 3 (step 2
No in 4), without giving an instruction to change the state of the damper 9,
Maintain the closed state until then.

Next, drive control of the gad motor 9a according to the above instruction will be described with reference to FIG.

If the state instruction of the damper 9 is open (“open” in step 31), it is determined whether or not the position sensor 9 that detects the open state is in the open detection state, and if it is not in the open detection state (in step 32, NO), and drives the gad motor 9a (step 33).

When the damper 9 is in the open detection state or is in the open detection state (YES in step 32), the drive of the gad motor 9a is stopped (step 34).

When the gad motor 9a is driven, the damper 9 normally has 5
It changes from the closed state to the open state in ~ 6 seconds. However, if an abnormality or the like of the position sensor 94 occurs, the open detection state may not occur, so the drive of the gad motor 9a is continued until the open detection state is reached within 20 seconds (step 35).
If the time period during which the gad motor 9a is driven exceeds 20 seconds (YES in step 35), the driving of the gad motor 9a is stopped (step 36), an abnormality is displayed, and the gas warm air is displayed. The operation of the heater 1 is stopped.

If the state instruction of the damper 9 is closed (“closed” in step 31), it is determined whether or not the position sensor 95 that detects the closed state is in the closed detection state. NO), and drives the gad motor 9a (step 38).

When the damper 9 is in the closed detection state or is in the closed detection state (YES in step 37), the driving of the gad motor 9a is stopped (step 34).

Even when the damper 9 is driven to the closed state, the gad motor
The drive of 9a is continued until the close detection state is reached within 20 seconds (NO in step 39), and the gad motor
When the time during which 9a is driven has passed 20 seconds (YES in step 39), the driving of the gad motor 9a is stopped (step 36), an abnormality is displayed, and the operation of the gas warm air heater 1 is performed. To stop.

As described above, in the present invention, since the damper 9 that operates according to the change in the room temperature is provided, effective heating can be performed and overheating is not felt.

In that case, damper 9 is closed at level 1 and level 3
Since it is opened at, even if the heating capacity becomes stable near level 2, the damper will not be opened and closed every time it changes to another level. Therefore, there is no unnecessary movement.

In addition, since ignition is easy, the proportional valve
It is not necessary to change the mutual control state of 18 and the convection fan 8.

Further, since the damper 9 is in the open state in the post-purge, the cooling is good, and the damper 9 is closed when the post-purge is completed. Therefore, the ignition operation can be started together with the operation start operation, and the maneuverability of the operation start is good.

Further, regarding the driving of the damper 9, it is only necessary to instruct the state of the damper 9, and it is not necessary to perform a special sequence control for the operation, so that the configuration of the microcomputer program drive device is simplified.

In addition, since unnecessary movement is eliminated, the energy saving effect is great.

The gas warm air heater 1 of the present embodiment having the above configuration,
At the time of adjustment in the factory, each level of the heating capacity can be easily obtained, and the voltage applied to the convection fan 8 or the current value to the proportional valve 18 can be easily adjusted corresponding to each level.

Further, in the adjustment of the voltage applied to the convection fan 8, for the levels 1 and 2, the variable resistor 37a is used to adjust the levels 3 to 3.
Since variable voltage can be adjusted to an appropriate voltage for each of the variable resistors 37b for 8, the amount of air blow corresponding to each amount of combustion from small combustion amount to large combustion amount can be obtained, and as a result, blowing air at a stable temperature is blown out. be able to.

In this embodiment, the heating capacity is set in steps, but it may be set continuously.

In the present embodiment, the warm air heater that mixes the combustion gas with the room air and blows it out into the room is shown, but the combustion air is sucked in from the outside to exhaust the combustion gas to the outside, and the heat exchange is performed in the heat exchanger. It may be a forced air supply / exhaust type (FF type) warm air heater that blows out the warm air that has been supplied into the room.

 The fuel may be petroleum.

[Brief description of drawings]

FIG. 1 is a block diagram showing a functional configuration of a control device for a gas warm air heater according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a front surface of the gas warm air heater according to this embodiment, and FIG. Is a perspective view showing the rear surface of the gas hot air heater of the present embodiment, FIG. 4 is a configuration diagram showing a schematic structure of the gas hot air heater of the present embodiment, and FIG. 5 is a closed state of the damper of the present embodiment. FIG. 6 is a partial front view of the gas warm air heater, FIG. 6 is a partial front view of the gas warm air heater showing the opened state of the damper of this embodiment, and FIG. 7 is a capacity determining unit of the control device of this embodiment. 8 to 10 are characteristic diagrams showing the determining characteristics of the heating capacity in the temperature control mode in Fig. 8, Fig. 8 to Fig. 10 are for explaining the opening / closing structure of the damper, and Fig. 8 is the hot air outlet of the gas warm air heater. Front view showing the vicinity, FIG. 9 is an M view in FIG. 8, FIG. 10 is an N view in FIG. 8, and FIG. Characteristic diagram showing the voltage applied to the convection fan for heating capacity to be constant, FIG. 12 is a characteristic diagram showing a status indication of the damper with respect to the heating capacity in the temperature control,
FIG. 13 is a flow chart for explaining a damper state instruction for each operating state, FIG. 14 is a flow chart for explaining a damper state instruction for a heating capacity in temperature control, and FIG. 15 is a gad motor for a damper instruction state. 6 is a flowchart for explaining a driving state of the. In the figure, 1 ... Gas warm air heater (warm air heater), 2 ... Outer casing (casing), 3 ... Indoor air intake,
5: Warm air outlet, 8: Convection fan (blower), 9
...... Damper, 10 ...... Burner (heating source), 23 ...... Thermistor (temperature detection means), 30 ...... Control device (control means), 9
4, 95 ... Position sensor (state detection means), level 1 (first reference heating amount), level 3 (second reference heating amount).

Claims (1)

(57) [Claims] 1. A blower and a heating source are arranged in a casing having an indoor air intake and a hot air outlet, and the heating amount of the heating source is controlled based on the indoor temperature detected by a temperature detecting means. In addition, in the warm air heater that controls the blower according to the heating amount, a damper that opens and closes a part of the warm air outlet according to the heating amount of the heating source is provided, and the heating amount is the first. When the heating amount is less than or equal to the reference heating amount, the damper is closed, and when the heating amount is greater than or equal to the second reference heating amount that is set to be greater than the first reference heating amount, the damper is opened.
A warm air heater, wherein a difference between the first reference heating amount and the second reference heating amount is increased with respect to a change in the heating amount.