JPH0686956B2 - Hot air heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot air heater using gas, kerosene, or the like as a fuel, and more specifically, it has a high ignition performance and a odor-free temperature. It concerns the wind heater.

(Prior Art) Generally, in a hot air heater that uses gas or kerosene as fuel and controls the room temperature by the heat of combustion, in order to achieve energy saving, for example, strong combustion with a calorific value of 3000 kcal / h and heat generation of A so-called Hi-Low-OFF combustion system that combines weak combustion of 1200 kcal / h and combustion stop has been adopted, and it has become possible to control the room temperature more accurately.

(Problems to be solved by the invention) However, in this type of hot air heater, when the combustion is stopped by the detection of the thermistor, only the fan is rotated after the stop in order to prevent the body from overheating. Is post-processed for cooling, and this post-process is controlled by a microcomputer or the like incorporated in a control circuit. Gas and kerosene ignite normally if the gas concentration is within a certain range, but it becomes difficult to ignite when the air is in excess of the optimum gas concentration. Has the drawbacks that occur.

This type of hot air heater has a built-in delay timer that performs post-processing for stopping combustion, but when the thermistor detects a drop in room temperature and starts combustion while the delay timer in which the fan is rotating is operating. Had a problem in that the ignition was poor and an offensive odor was generated because ignition was performed in a state where the air supply was excessive compared to the ignition when the fan was not initially rotating.
In particular, all primary combustion burners with low NO _x burn with a lean gas concentration, so this tendency is more pronounced than the Bunsen burner burners and all secondary combustion burners. It becomes even more remarkable when a natural gas is used as a fuel.

Further, when using butane gas or the like as fuel, there is also a problem that when ignition is performed in an excess air state, an abnormal combustion noise called boo is emitted at the initial stage of ignition.

The present invention solves the above problems and provides a warm air heater in which the room temperature is comfortably controlled and has excellent ignition performance and no odor during ignition.

(Means for Solving Problems) In order to solve the above problems, the present invention relates to a temperature detector for detecting a room temperature, and a room temperature for reading a room temperature by using a voltage signal output by the temperature detector as an input signal. A measurement unit, a set temperature determination unit that determines the set temperature by using the output of a temperature setting device that sets the room temperature as an input signal, a set temperature registration unit that stores the temperature determined by the set temperature determination unit, and the above room temperature measurement Stop level detection unit that determines the stop of combustion based on the level of the difference between the room temperature and the set temperature registration unit and the set temperature, a delay timer that rotates the fan for a certain period of time after the stop of combustion, and rotation due to the inertia of the fan The extension tamai set assuming the time to stop, the combustion amount calculation unit that calculates the combustion amount after the operation of this extension timer, the rotation of the fan and the combustion amount of the burner are controlled, In addition, a device control unit that stops the rotation of the fan at the time of ignition is provided.

(Operation) With such a configuration, when the combustion is restarted after the combustion is stopped, the fan that continues to rotate due to the inertia is completely stopped and then ignited. Therefore, the ignitability is good and the odor is not generated.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a front view of an essential part showing an operating portion of a warm air heater according to the present invention, showing an ignition switch 1 for operating the warm air heater, a temperature control switch 2 for setting a room temperature, and an indication that it is in operation. A power supply lamp 3, a combustion lamp 4 that indicates that combustion is in progress, and a room temperature lamp 5 that displays the set room temperature stepwise are provided. The temperature displayed beside each indicator lamp of the room temperature lamp 5 is 16,18,20,22,24,26.
The numbers and high letters indicate temperatures in degrees Celsius and the high letters indicate temperatures above 28 ° C. Temperature control switch 2
When the room temperature lamp 5 is operated to control the room temperature to 18 ° C., the room temperature lamp 5 blinks 18 indicators. When set to high, it burns continuously.

FIG. 2 is an electric circuit diagram of this embodiment. The operation of the warm air heater will be described with reference to this electric circuit diagram. First, when the ignition switch 1 shown in FIG. Ignition switches 1a and 1b shown in two places in succession by broken lines are closed and the warm air heater is operated. While the valve of the ignition cock 6 is opened, while the ignition switch 1b is closed, the second solenoid valve (SV ₂ ) 7 is actuated to open the valve, and the large burner 8 and the second solenoid valve 7 are inserted from the cock 6. The passage to the small burner 9 opens. At the same time, current flows through the igniter 10 and the fan motor (FM) 11. After that, the first solenoid valve (SV ₁ ) 12 is actuated and the valve is opened, the gas passes through the first solenoid valve 12, the cock 6 and the governor 13 and then is split into two forks. After ignition, the flame is transferred to the small burner 9 and both burners 8 and 9 burn together. The air heated by the combustion heat of both burners 8 and 9 blows out as warm air.

The large burner 8 and the small burner 9 each have a frame rod 14 and a frame rod for detecting the presence or absence of combustion, respectively.
15 is mounted, and its output is input to the microcomputer 17 via the combustion detection circuit 16 connected to these. On the other hand, the output corresponding to the room temperature detected by the temperature detector 18 passes through the temperature control circuit 19 and is also supplied to the microcomputer 17
Entered in. Furthermore, the microcomputer 17 includes
In addition to being connected to the temperature control switch 2 shown in FIG.
A first solenoid valve check circuit 20 for detecting opening / closing of the first solenoid valve 12 inserted in the gas passage is connected.

FIG. 3 is a block diagram of the microcomputer 17 described above. The microcomputer 17 includes a room temperature measuring unit for reading the output of the temperature detector 18 converted into a voltage signal by the temperature control circuit 19.
21 and the temperature control switch 2
Of the outputs corresponding to 6 steps from ℃ to 2 ℃ every 26 ℃, and 7 steps of continuous burning “high”, the output of the temperature set as the desired room temperature is set as the input signal. A set temperature determination unit 22, a set temperature registration unit 23 that stores the set temperature determination unit 22, and a difference between the room temperature read by the room temperature measurement unit 21 and the set temperature stored in the set temperature registration unit 23. A temperature difference calculation unit 24, a combustion stop level detection unit 25 that determines combustion stop depending on the temperature level calculated by the temperature difference calculation unit 24, and a combustion amount calculation unit 26 that similarly continues combustion and adjusts the combustion amount, A delay timer 27 for controlling the fan rotation time after the combustion is stopped, a delay timer 28 for extending the inertial rotation time ignition of the fan, and the combustion amount calculation unit 2 described above.
6, the fan motor 11, the first solenoid valve 12, the second solenoid valve 7 according to the input signals from the delay timer 27 and the delay timer 28.
And a device control section 29 for outputting the driving force of each display section of the power source lamp 3, the combustion lamp 4, and the room temperature lamp 5.

The operation of the warm air heater having such a configuration will be described.
When the ignition switch 1 shown in FIG. 1 is pressed, the power lamp 3
And the room temperature lamp 5 lights up, and the ignition switch shown in FIG.
1a and 1b are closed and the valve of the cock 6 is opened. Next, the first solenoid valve check circuit 20 operates to check the presence / absence of abnormality of the first solenoid valve 12, and when it is confirmed that there is no abnormality, the device control section of the microcomputer 17 shown in FIG. A device control command is issued through 29 to operate the second solenoid valve 7 to open the valve and to supply a current to the igniter 10 and the fan motor 11. At the same time, the device control section 29 causes the room temperature lamp 5 shown in FIG. 1 to blink. About 1 second later, the first solenoid valve 12
When the valve is opened and the gas passage is fully opened and both large and small burners 8 and 9 are ignited, the frame rods 14 and 15 attached to the burners detect ignition, and the signal indicates that While the illustrated combustion lamp 4 is turned on, the current of the igniter 10 shown in FIG. 2 is cut off.

When combustion is started, the output of the temperature detector 18 is read by the room temperature measuring unit 21 of the microcomputer 17, and the calculation result of the temperature difference calculating unit 24 that compares this with the set temperature stored in the set temperature registration unit 23. Based on the
Strong combustion that opens both the solenoid valve 12 and the second solenoid valve 7, weak combustion that closes the second solenoid valve 7, or combustion stop that closes the first solenoid valve 12 based on the detection result of the combustion stop level detection unit 25 This is performed according to a command from the control unit 29.

When the combustion stop level detection unit 25 determines that the calculation result of the microcomputer 17 is the stop level and sends a signal to the device control unit 29 to close the first solenoid valve 12 and cut off the gas supply, the delay timer 27 starts the timer. Send a signal of. This delay timer
Reference numeral 27 is for rotating the fan for a certain period of time, for example, 80 seconds, to prevent overheating of the body, and instructs the device control unit 29 to drive the fan motor 11 during this period.

When the delay timer 27 finishes its operation, the extension timer 28 starts operating in response to the end signal. Further, the delay timer 27 sends an operation end signal to the device control unit 29, and the device control unit 29 receiving this signal opens the electromagnetic switch of the fan motor 11. The set time of the extension timer 28 is generally about 10 to 15 seconds, assuming the time until the fan completely stops.

When the operation of the extension timer 28 ends, the combustion amount calculation unit 26
And the end signal is sent to the device control unit 29. Upon receipt of the signal, the combustion amount calculation unit 26 selects strong combustion or weak combustion in the case of Hi-Low-OFF combustion based on the temperature difference calculated by the temperature difference calculation unit 24, and combustion in the case of proportional combustion. Calculates the quantity and controls the equipment
29 receives this, in the case of strong combustion the first solenoid valve 12 and the second
The solenoid valve 7 is opened together, the igniter 10 is discharged, and the large burner 8
And the small burner 9 is ignited, and the combustion lamp 4 is turned on.
When the combustion is weak, the second solenoid valve 7 is closed and the large burner 8
Ignite only. At the same time, the electromagnetic switch of the fan motor 11 is closed and the fan is rotated to send out warm air.

(Effects of the Invention) As described above, according to the present invention, the combustion start timing of the burner is extended until the fan that rotates for a certain period of time to stop overheating of the body completely stops after the combustion is stopped. Since it is postponed by the action of, the fan can be rotated and ignition can be performed in a state where the gas concentration is constant, the ignition state is stable, and the odor at the time of ignition is reduced.

Further, when butane gas or the like is used as the fuel, it is possible to prevent abnormal combustion noise that occurs in an excess air state.

[Brief description of drawings]

FIG. 1, FIG. 2 and FIG. 3 are a front view of an essential part of a warm air heater according to the present invention, an electric circuit diagram and a block diagram of a microcomputer, respectively. 1,1a, 1b …… Ignition switch, 2 …… Temperature control switch,
3 ... power lamp, 4 ... combustion lamp, 5 ... room temperature lamp, 6 ... cock, 7 ... second solenoid valve, 8 ... large burner, 9 ... small burner, 10 ... igniter, 11 ...... Fan motor, 12 ...... First solenoid valve, 13 ...... Governor, 14,15 ...... Combustion detection frame rod, 16 ...... Combustion detection circuit, 17 ...... Microcomputer, 18 ...... Temperature detector, 19 ...... Temperature control circuit, 20 ...... First solenoid valve check circuit, 21 ...... Room temperature measuring part, 22 ...... Set temperature judgment part, 23 ...... Set temperature registration part, 24
...... Temperature difference calculator, 25 ...... Fuel stop level detector, 26 ...
… Combustion amount calculation part, 27 …… delay timer, 28 …… extension timer, 29 …… equipment control part.

Front Page Continuation (72) Inventor Yuichi Emura, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-56-923 (JP, A)

Claims (1)

[Claims] 1. A temperature detector for detecting a room temperature, a room temperature measuring unit for reading a room temperature by using an electric signal output by the temperature detector as an input signal, and a set temperature as an input signal for an output of a temperature setting device for setting the room temperature. A set temperature determination unit for determining
Combustion stop level that determines combustion stop based on the level of the difference between the set temperature registration section that stores the temperature determined by this set temperature determination section and the room temperature read by the room temperature measurement section and the set temperature stored by the set temperature registration section A detection unit, a delay timer that drives the fan for a fixed time after the combustion is stopped, an extension timer that delays combustion restart for a fixed time after the fan is stopped by the delay timer, and a combustion amount is calculated after the operation of the extension timer ends. A warm air heater including a combustion amount calculation unit and a device control unit that controls the rotation of the fan and the combustion amount of the burner and that stops the rotation of the fan during ignition.