JP2650655B2 - Hot air heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a hot air heater in which a heating source and a blower are arranged in a casing, and the heating source and the blower are controlled according to a target heating amount.

[0002]

2. Description of the Related Art In a hot air heater, the amount of heat of a heating source and the amount of air blown by a blower are appropriately controlled with respect to each other, thereby blowing out hot air at an appropriate temperature. 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.

[0003]

However, in a blower in which a fan is driven by a motor, when the blow duct is constant, the rotation speed characteristic with respect to the voltage applied to the motor has a fixed relationship. If the maximum heating amount of the heating source is increased as required and the heating amount of the heating source can be changed in a wide range from a small heating amount to a large heating amount, the applied voltage of the blower is changed accordingly When the rotation speed is changed from a low rotation speed to a high rotation speed, the blowing amount increases when the heating amount is large, and the blowing amount decreases when the heating amount is small.

[0004] For this reason, when the amount of blown air is small, the warm air blown out from the warm air outlet is weak and hard to reach far, and the warm air tends to stagnate near the warm air heater. As described above, when the blower operates at a low rotation speed, there are two cases, a case where the room temperature is gradually increased and the heating amount is reduced, and a case where the room temperature is gradually reduced. In the former case, if the hot air is easy to hit the user, it will be easy to feel as overheating, and even if there is a stagnation of the hot air, it is unlikely that the heating will be sensed insufficiently,
In the latter case, if the warm air does not effectively act on the user, the user tends to feel insufficient heating.

On the other hand, in a hot air heater using a burner as a heating source, a safe and reliable ignition operation is desired. However, at the time of ignition, an air flow is generated in the burner by pre-purge at the start of operation. Since the temperature of the burner is low, it is difficult to perform a smooth ignition. For this reason, conventionally, a special control is performed in the air-blowing control system or the fuel control system so that the air-fuel ratio is easily ignited only at the time of ignition, and the air-blowing control system or the fuel control system is complicated.

It is an object of the present invention to provide an efficient and smooth ignition operation in a hot air heater using a burner as a heating source without complicating a ventilation control system or a fuel control system.

[0007]

According to the present invention, claim 1 is:
Distribution and burner derived combustion air by operating from the room air inlet into the casing of the blower and the blower for generating an air flow to the warm air blowing mouth and a room air inlet and the warm air blowing port And the set temperature and the detected room temperature
Control the amount of fuel supplied to the burner in accordance with the temperature difference between
And the blower according to the amount of fuel supplied to the burner.
Hot air heater equipped with control means for controlling the rotation speed of the
Opening and closing a part of the opening of the hot air outlet,
Changes the air flow generated by the blower
A damper is provided, and the control means controls the ignition operation of the burner.
Sometimes the fuel supply to the burner is controlled to the ignition supply
While controlling the blower according to the ignition supply amount,
Controlling the damper to a closed state is technical means.
This allows the blower to operate during the burner ignition operation.
The combustion air is guided to the burner,
Since the provided damper is closed, the ignition
The amount of fuel supplied is controlled by the blower.
The amount of combustion air generated is less than the amount corresponding to the amount of ignition supply.
Less. Therefore, during ignition operation,
Fuel supplied to the burner
The amount of combustion air relatively decreased, resulting in excess fuel and
It is easy to fire. As a result, the ventilation control system or the fuel control system can be simplified.

In the second aspect, the post-purge is performed by operating the blower after the combustion of the burner is stopped, and the damper is opened in the post-purge. Since the damper is opened during the post-purge, the amount of air blow increases, and the burner and the like can be quietly cooled in a short time. Further, when the post-purge is completed, the damper is driven to the closed state. Therefore, in the next operation, the damper is already in the closed state before the ignition operation is started, and the startability of the operation start is good.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on embodiments. In the stationary gas hot air heater 1 shown in FIGS. 2 and 3, an outer casing 2 is formed from several members made of a metal plate and a resin, and the outer casing 2 has indoor air having a plurality of openings. An intake port 3 and a combustion air intake port 4 are provided above the rear surface, and a warm air outlet port 5 for blowing hot air is provided below the front surface. The indoor air intake port 3 and the intake port 4 are attached to and detached from the outer casing 2. It is covered by a freely provided filter 6.

As shown in FIG. 4, a convection duct 7 is provided inside the outer casing 2, and in the vicinity of the hot air outlet 5 in the convection duct 7, the convection duct 7 is used as a blowing casing in the convection duct 7. The arranged impeller 8a is connected to the motor 8
A convection fan 8 of a once-through type driven by b is disposed, and the suction port 4 and the hot air outlet 5 are an upstream end and a downstream end of the convection duct 7, respectively.

The hot-air outlet 5 is provided with a damper 9 for closing a part of the hot-air outlet 5, and rotates according to the operation state to change the state of the air flow passing through the convection duct 7. Control. Here, when a part of the hot air outlet 5 is closed, as shown in FIG.
In order to close the upper half of the hot air outlet 5 and open the hot air outlet 5, as shown in FIG.

The opening / closing mechanism of the damper 9 will now be described with reference to FIGS.
It will be described based on. FIG. 8 shows members constituting the vicinity of the hot air outlet 5 of the outer casing 2 and the damper 9.
The damper 9 is rotatably supported by a rotating shaft (not shown) on the back side of the hot air outlet 5, and has a drive rod 91 for opening and closing.
Is provided. On the other hand, the damper 9 is provided with a gad motor 9a comprising a motor and a speed reduction mechanism as driving means in the vicinity, and an output member 92 is fixed to an output shaft 9b which is driven to rotate in one direction. As shown in FIGS. 9 and 10, the output member 92 includes a disc 92 a and an output rod 9.
2b, a connecting plate 93 connected to the driving rod 91 is connected to the output rod portion 92b.

When the gad motor 9a is driven by the above opening / closing mechanism and the output shaft 9b is rotated, the disk portion 92a of the output member 92 is rotated, and the output rod portion 92b is rotated. As a result, the connecting plate 93 makes a substantially reciprocating motion in accordance with the displacement of the output rod portion 92b, and the drive rod 91 drives the damper 9 to open and close, thereby changing the opening area of the hot air outlet 5.

On the other hand, on the outside of the disk portion 92a of the output member 92, position sensors 94 and 95 composed of microswitches for detecting the open state and the closed state of the damper 9 are provided close to each other in the axial direction. The disk portion 92a includes a detection concave portion 92c for detecting a closed state in a portion corresponding to each of the detection portions 94a and 95a of the position sensors 94 and 95, and a detection concave portion (not shown) for detecting an open state. Are formed. As a result, in FIG.
Is in the open detection state in which the detection unit 94a is located in the detection concave portion 92c and detects the open state of the damper 9.
When the positions 4a and 95a abut on the outer peripheral surface of the disk portion 92a, the position sensors 94 and 95 are in a non-detection state in which each state is not detected.

A burner 10 as a heating source is disposed upstream of the convection fan 8 in the convection duct 7, and the high-temperature combustion gas generated in the burner 10 is supplied to the indoor air inlet by the operation of the convection fan 8. The hot air is mixed with the room air taken in from the hot air outlet 3 and becomes hot air, and is blown out from the hot air outlet 5. A nozzle 13 serving as a downstream end of a fuel supply path 12 for guiding fuel gas is disposed in an air guide pipe 11 for guiding combustion air from the suction port 4 to the burner 10, and fuel gas ejected from the nozzle 13 is used for combustion. The mixture is guided to the mixing chamber 14 together with the air, and burns in the burner 10.

In the fuel supply passage 12, reference numeral 12a denotes a main pipe having a proportional valve 18 for adjusting the amount of fuel gas;
2b is a bypass pipe provided with a gas amount adjusting screw 19 for adjusting the minimum supply amount of fuel gas, 15 and 16 are solenoid valves,
Reference numeral 17 denotes a gas governor for keeping the supply gas pressure constant.

The bypass pipe 12c is an auxiliary fuel supply passage for increasing the supply amount of the fuel gas by a predetermined amount (for example, 15%) in order to perform rapid heating (hot dash) at the beginning of the operation. A bypass solenoid valve 20 that is opened is provided. 21 is an ignition electrode for performing spark discharge for ignition, 22 is a thermocouple for monitoring the combustion state of the burner 10, and 23 is a thermistor for detecting the room temperature.

Reference numeral 24 on the upper surface of the outer casing 2 denotes an operation switch for instructing start and stop of operation, 25 denotes a resin opening / closing lid, and a plurality of switches and a display device for performing various operations are provided inside the lid. An operation display unit in which the gas warm air heater 26 is provided is provided. The control device 30 shown in FIG. 1 controls the start and stop of the operation and the heating amount of the gas hot air heater 1.

The control device 30 is a microcomputer provided with various input / output circuits (hereinafter referred to as "microcomputer").
And a drive circuit for driving each unit of the gas warm air heater 1 by the microcomputer. The functional unit formed by the microcomputer and each drive circuit includes a mode control unit 3
1, display control unit 32, setting control unit 33, operation control unit 3
4. There is a capacity determining unit 35, a proportional valve control unit 36, a fan control unit 37, and a damper control unit 38.

The operation switches for giving operation signals to the control device 30 include, in addition to the operation switch 24, a display changeover switch 41, a time adjustment switch 42, and the like.
There are a setting switch 43 composed of two switches, two ON timer switches 44 and 45, an OFF timer switch 46, and a save operation switch 47.

The operation purpose of each switch and the control contents 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). Then, the operation mode or the display mode is changed as follows according to the conduction state of the external circuit connected to each of the connector terminals 51 and 52.

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

In the temperature control mode, the mode control section 31 switches the display device 26 between the temperature display mode and the time display mode in response to an operation signal from the display changeover switch 41, and switches between the display modes. The setting mode by the setting switch 43 is determined in synchronization.

The connector terminal 52 has, 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 that matches the connector terminal 52, the mode control unit 31 short-circuits the connection pins. The display control unit 32 is controlled to the inspection mode according to the state. In this case, the connector matching the connector terminal 52 is provided with a changeover switch for forming a predetermined short circuit between the pins in advance, and a required inspection mode can be easily selected.

The display control unit 32 selects the display contents of the display device 26 in accordance with the control state of the mode control unit 31, and displays the selected display contents as follows. In this embodiment, as the display device 26, 4
An LED consisting of 7 segments of digits is provided,
Characters corresponding to numerals from "0" to "9" and alphabets from "A" to "F" are displayed.

In the temperature control mode, a temperature display mode and a time display mode are switched in response to a switching signal from the display changeover switch 41. In the temperature display mode, the set temperature and the detected temperature are set. Switch 4
2 displays the current time or the set time selected by the user. In the case of the step mode, the setting switch 4
In accordance with the heating capacity selected by 3, a capacity level corresponding to each heating capacity is displayed.

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

The display device 26 has an LED for displaying operation, combustion, or hot dash, a selected state of the time setting switch 42, and timer switches 44 to 44.
An LED for displaying the operation state of the save operation switch 47 and an LED for blinking when the clogging of the filter 6 is detected by a filter switch (not shown) are provided.

The setting control section 33 is a function section for controlling the contents set by the setting switch 43 according to the setting mode. In the case of the temperature control mode, the setting control section 33 controls the temperature according to the display mode selected by the display changeover switch 41. In the display mode, the set temperature is set, and in the time display mode, the time selected by the time setting switch 42 is set.

As the set temperature to be set, "L (about 1
0 ")," 16 "," 18 ", ...," 2
6 "," H (for continuous strong operation) "and 8 stages at 2 ° C. The setting control unit 33 has a lock function mainly for fixing (locking) the set temperature. When the two setting switches 43 are simultaneously operated and the operation time continues for 0.5 seconds or more, After fixing the set temperature, etc., the display device 2
The lock lamp of No. 6 indicates that it is being fixed.

When the set temperature is fixed, even if one of the setting switches 43 is operated, the set temperature is not changed. Further, when the set temperature is fixed, the operation for starting the operation by the operation switch 24 and each of the timer switches 44 to 46 is not accepted in the operation control. If two setting switches 43 are simultaneously operated for 0.5 second or more during fixing, the fixing is released and the operation of each switch is accepted again.

The operation control section 34 performs operation start control in a predetermined sequence in accordance with the operation signal of the operation switch 24 to start the ignition control of the burner 10, and during combustion, operates the operation signal of the operation switch 24. In response to this, the operation stop control is performed, and a predetermined fire extinguishing control is performed. Further, following the ignition control, the ignition detection by the thermocouple 22 is performed, and when the output voltage of the thermocouple 22 becomes equal to or higher than a predetermined voltage, it is determined that the ignition is detected.

During combustion, it is determined whether or not the combustion is normal, based on 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 described below is equal to or lower than level 2, 10 mV is used as the reference voltage, and
In the case of 8, the output voltage of the thermocouple 22 is compared with the reference voltage using 14 mV as a reference voltage.

Further, in this embodiment, a timer 34a having a clock function is provided, and the operation is controlled not only in response to the operation of the operation switch 24 but also by the operation of each of the timer switches 44 to 46. Each input timer switch 4
When the buttons 4 and 45 are operated, the operation start operation is performed prior to the time before the set time so that the indoor temperature becomes the set temperature at the set time preset in the timer 34a.

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, each of the timer switches 44-4
6, the operation is performed for a predetermined time (for example, 60 minutes) as the operation continuation time.
Is activated, and after a predetermined time elapses, operation stop control is automatically performed to end the operation. Note that the off timer switch 4
In the case where the device 6 is operated once and then operated again, the timer 34a is reset, and the operation is continued for a predetermined time from that time.

On the other hand, each set time for performing the timer operation control in accordance with each of the ON timer switches 44 and 45 is stored in a storage device provided with the timer 34a. The data is stored in each storage device selected corresponding to each of the ON timer switches 44 and 45 by 42.

When the above-described fixing is performed, the operation control unit 34 does not accept any operation for starting operation by the operation switch 24 and the timer switches 44 to 46. Therefore, when the operation is fixed during operation, only the operation for stopping the operation by the operation switch 24 is accepted, and when the operation is fixed during the operation stop, the timer operation control by the ON timer switches 44 and 45 is performed. Only when the operation is started, the operation is started in advance of the set time, and when the timer operation control is not performed, the operation is not started at all unless the fixing is released.

In the operation start control, the burner 10 is ignited after the pre-purge for 3 seconds is performed, and in the operation stop control, the post-purge is performed for about 20 seconds after the fire extinguishing control of the burner 10 is performed. Will be

The capacity determination unit 35 determines the heating capacity, which is a reference for determining the amount of combustion of the burner 10 and the voltage applied to the convection fan 8, in accordance with the operation of the setting switch 43. In the present embodiment, as the heating capacity, eight steps from level 1 as the weakest heating capacity to level 8 as the largest heating capacity are set in advance in steps,
In the case of the temperature control mode, as shown in FIG. 7, the heating capacity is determined from the temperature difference between the set temperature by the setting switch 43 and the temperature detected by the thermistor 23, and is set to “L” or “H” as the set temperature, respectively. If so,
The heating capacity is determined to be level 8 or level 1 irrespective of the detected temperature. In the case of 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.

The capacity determining section 35 is provided with a save operation switch 47 for preventing overheating according to the user's request.
7 is operated, a save operation lamp (not shown) is turned on, and the set temperature is lowered by 1 ° C. every 30 minutes after the temperature detected by the thermistor 23 reaches the set temperature. As a result, if the room is sufficiently heated for the set temperature,
Since the actual set temperature gradually becomes lower than the apparent set temperature, there is no need for the user to change the set temperature again, and the fuel gas consumption can be suppressed.

In the early stage of the operation, the burner 1
Level 4 is determined to facilitate ignition of 0,
When the ignition is detected, the level 8 is determined for a predetermined time (15 minutes) thereafter. At this time, the bypass solenoid valve 20 is simultaneously opened to perform the rapid heating (hot dash) operation, and the predetermined time elapses. Thereafter, the rapid heating (hot dash) operation ends, and the heating capacity is determined based on the set temperature and the temperature detected by the thermistor 23.

The proportional valve control section 36 drives and controls the proportional valve 18 in accordance with the heating capacity determined by the capacity determining section 35.
Here, in order to ensure that a current value corresponding to the determined heating capacity is supplied, a variable resistor 36a adjusted by a manual operation is provided.
The proportional valve 18 is driven based on the control value obtained by combining the correction value given by the above and the determined heating capacity.

The fan control section 37 controls the drive of the convection fan 8 according to the heating capacity determined by the capacity determination section 35. Here, variable resistors 37a and 37b adjusted by manual operation are provided to drive at a rotation speed corresponding to the determined heating capacity, and as shown in FIG. In the case of 2, the voltage between the solid line A and the solid line B is applied based on the control value obtained by combining the correction value given by the variable resistor 37a and the determined heating capacity, and the level 3 to 8 In this case, a voltage between the solid line C and the solid line D is applied to the motor of the convection fan 8 based on a control value obtained by combining the correction value given by the variable resistor 37b and the determined heating capacity.

As a result, even if the motor of the convection fan 8 varies, an appropriate voltage corresponding to the control value is applied, and the optimum rotation speed from the high rotation speed to the low rotation speed corresponding to each level is determined. As a result, appropriate air is circulated for the amount of heating 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 section 38 is a functional section for controlling the drive of the gad motor 9a provided in the damper 9, and according to the control state of the operation control section 34 at the time of starting and stopping the operation, and during the operation. Each is controlled according to the heating capacity determined by the capacity determining unit 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. For this reason, while the heating capacity determined by the above-described capacity determination unit 35 is level 4 and fuel gas is supplied in accordance with the level 4, the supply amount of combustion air is relatively reduced. The gas becomes gas-rich and ignition becomes easy.

The damper 9 is opened in response to the 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 opened or closed according to the heating capacity determined by the capacity determining unit 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, at level 1 it is always closed, at level 3 or higher it is always open, and at level 2 when the heating capacity changes from level 3 or higher to level 2 The open state is maintained, and when the heating capacity changes from level 1 to level 2, the closed state is maintained.

On the other hand, in the post-purge of the operation stop control, the burner 10 and the convection duct 7 are quickly cooled by maintaining the open state and increasing the amount of air passing through the convection duct 7 to enable the post-purge. When completed, it is driven to the closed state. As a result, when the ignition operation is performed, it is not necessary to re-open the closed state, and the operation start operation such as the prepurge can be promptly started.

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

When the position sensors 94 and 95 are out of order, the control instruction value and the detection state may not always match. In such a case, the gad motor 9a
Of the burner and the burner 1
Since the combustion state of 0 becomes unstable, the driving time of the gad motor 9a is limited to a maximum of 20 seconds in order to protect the gad motor 9a and the damper 9b and to ensure safety. Driving is not performed, and operation is stopped after elapse of 20 seconds.

When the open state and the closed state are simultaneously detected, the operation is stopped after a lapse of 20 seconds. In the present embodiment, when driving the damper 9, usually,
The state change is completed in 5 to 6 seconds.

Hereinafter, the operation of instructing the state of the damper 9 by the damper control unit 38 will be described in accordance with the operation state of the gas warm air heater 1 shown in FIG. When the operation start operation is performed by the operation switch 24 (YE in step 1).
S), predetermined ignition control is performed (step 2). In this ignition control, the closed state of the damper 9 is instructed.

If the ignition is detected by the thermocouple 22 within a predetermined time after the ignition control (YES in step 3), the damper 9 is instructed to open, and the bypass electromagnetic switch is provided for rapid heating (hot dash). Valve 2
0 is set to the open state, the forced strong operation is performed (Step 4), then the temperature control is started (Step 5), and the operation is continued until the operation stop operation is performed (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 the ignition is not detected within the predetermined time, regardless of the ignition control being performed (step 3).
(NO in), abnormal stop (Step 7), and a message to that effect is displayed.

Thereafter, when an operation for stopping the operation is performed by the operation switch 24 (YE in the step).
S), the electromagnetic valves 15 and 16 are closed by the fire extinguishing control (step 8), and post-purge is started (step 9). In the fire extinguishing control and the post-purge, the damper 9 is opened. Therefore, since sufficient air passes through the convection duct 7 heated by the burner 10, the cooling effect is large and the convection duct 7 is quickly cooled.

When the post-purge is completed (YES in step 10), the damper 9 is closed (step 1).
1) When the closed state is detected, the operation enters the operation standby state, and waits for the next operation start operation (step 1).

Next, the control of the state indication of the damper 9 in the temperature control at the step 5 will be described with reference to FIG. In this temperature control, the current level of the heating capacity determined by the capacity determining unit 35 is compared with the previous level. If the current level does not change from the previous level (“=” in step 21), the damper The state is continued without giving the state change instruction of step 9.

If the current level is smaller than the previous level ("<" in step 21), it is determined whether or not the current level is smaller than 2, and if the current level is smaller than 2 (step 21). 22 (YES in step S22), the closed state is instructed (step S23), and if the current level is greater than two (NO in step S22), the damper 9
Is not given, and the open state is maintained.

In step 21, if the current level is higher than the previous level (">"), it is determined whether the current level is 3 or more, and if the current level is 3 or more (step 21). 24, an open state is instructed (step 25). If the current level is smaller than 3 (NO in step 24), no instruction to change the state of the damper 9 is given, and the previous closed state is maintained. I do.

Next, the gad motor 9 according to the above instruction
The drive control of a 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 95 for detecting the open state is in the open detection state. NO), the gad motor 9a is driven (step 33).

When the damper 9 is in the open detection state or in the open detection state (Y in step 32).
ES), driving of the gad motor 9a is stopped (step 34). When the gad motor 9a is driven, the damper 9 normally changes from the closed state to the open state in 5 to 6 seconds. However, if an abnormality or the like of the position sensor 94 occurs, the open detection state may not be achieved. Therefore, the driving of the gad motor 9a is continued only within 20 seconds until the open detection state is reached (NO in step 35). , Gad motor 9a
If 20 seconds have elapsed (YES in step 35), the drive of the gad motor 9a is stopped (step 36), an abnormality is displayed, and the operation of the gas warm air heater 1 is started. Stop.

When the state instruction of the damper 9 is closed ("close" in step 31), it is determined whether or not the position sensor 95 for detecting the closed state is in the closed state. If NO in step 37), the gad motor 9a is driven (step 38). If the damper 9 is in the closed detection state or is in the closed detection state (YES in step 37), the drive of the gad motor 9a is stopped (step 34).

Even when the damper 9 is driven to the closed state, the drive is continued until the driving time of the gad motor 9a becomes the closed detection state within 20 seconds (N in step 39).
O), when the gad motor 9a is driven for more than 20 hours (YES in step 39), the gad motor 9a is stopped (step 36), an abnormality is displayed, and the gas hot air heater is operated. 1 is stopped.

As described above, according to 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 this case, since the damper 9 is closed at the level 1 and opened at the level 3, even if the heating capacity is stabilized near the level 2, the damper 9 is not opened and closed each time the heating capacity is changed to another level. Therefore, there is no useless movement.

Further, since ignition is easy, it is not necessary to change the mutual control state of the proportional valve 18 and the convection fan 8 in the ignition operation. Further, in the post-purge may be cooled because the damper 9 is in the open state, the damper 9 is closed when the post-purge is complete, start the operation starting order to be started ignition operation with the next operation start operation <br /> Good.

Further, with respect to 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. Therefore, the program of the microcomputer and the configuration of the driving device can be simplified. Become. Further, since there is no useless movement, the energy saving effect is large.

In the gas hot air heater 1 according to the present embodiment having the above-described configuration, each level of the heating capacity can be easily obtained at the time of adjustment in the factory, and the voltage applied to the convection fan 8 corresponding to each level is obtained. Alternatively, adjustment of the current value to the proportional valve 18 is easy. Further, in the adjustment of the voltage applied to the convection fan 8, the voltages can be adjusted to appropriate levels for the levels 1 and 2 by the variable resistor 37a and to levels 3 to 8 by the variable resistor 37b. An air blowing amount corresponding to each combustion amount from the combustion amount to the large combustion amount is obtained, and as a result, it is possible to blow out hot air having a stable temperature.

In this embodiment, the heating capacity is set stepwise, but may be set continuously. In the present embodiment, the hot air heater that mixes the combustion gas with the indoor air and blows the indoor air is shown. However, the combustion air is sucked from the outside to exhaust the combustion gas to the outside, and the heat exchange is performed by the heat exchanger. Forced air supply and exhaust system (FF
) May be used. The fuel may be petroleum.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a functional configuration of a control device for a gas hot air heater according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a front surface of the gas hot air heater of the present embodiment.

FIG. 3 is a perspective view showing a rear surface of the gas warm air heater of the embodiment.

FIG. 4 is a configuration diagram showing a schematic configuration of a gas warm air heater of the present embodiment.

FIG. 5 is a partial front view of the gas warm air heater showing a closed state of the damper of the embodiment.

FIG. 6 is a partial front view of the gas warm air heater showing an open state of the damper of the embodiment.

FIG. 7 is a characteristic diagram showing a characteristic of determining a heating capacity in a temperature control mode in a capacity determining unit of the control device of the present embodiment.

FIG. 8 is a front view showing the vicinity of a hot air outlet for describing an opening / closing structure of a damper of the gas hot air heater according to the present embodiment.

FIG. 9 is a diagram viewed from M in FIG. 8;

FIG. 10 is a view as viewed from N in FIG. 8;

FIG. 11 is a characteristic diagram illustrating a voltage applied to a convection fan with respect to a heating capacity determined by a capacity determining unit of the embodiment.

FIG. 12 is a characteristic diagram illustrating a state instruction of a damper with respect to a heating capacity in the temperature control according to the present embodiment.

FIG. 13 is a flowchart illustrating a state instruction of a damper for each operation state in the present embodiment.

FIG. 14 is a flowchart for explaining a damper state instruction with respect to the heating capacity in the temperature control according to the present embodiment.

FIG. 15 is a flowchart for explaining a driving state of a gad motor with respect to an instruction state of a damper in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas hot air heater (hot air heater) 2 Outer casing (casing) 3 Indoor air intake 5 Hot air outlet 8 Convection fan (Blower) 9 Damper 10 Burner 30 Control device (Control means)

Claims (2)

(57) [Claims] 1. A blower for generating an air flow from the indoor air inlet to the hot air outlet in a casing having an indoor air inlet and a hot air outlet, and combustion air is guided by the operation of the blower. And a burner that is set in accordance with a temperature difference between a set temperature and a detected room temperature.
Fuel supply to the burner and fuel to the burner
In a warm air heater provided with control means for controlling the number of revolutions of the blower according to a supply amount , a part of an opening of the warm air outlet is opened and closed, and
And a damper for changing a flow rate of air generated by the blower , wherein the control means controls a fuel supply amount to the burner to an ignition supply amount during an ignition operation of the burner, and controls the blower to the point.
A hot-air heater characterized by controlling according to the amount of fired supply and controlling the damper to a closed state. 2. The method according to claim 1, wherein the post-purge is performed by operating the blower after the combustion of the burner is stopped, and the damper is opened in the post-purge and the damper is closed after the post-purge is completed. The hot air heater according to claim 1, characterized in that: