JPS6120789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a control device for a hot air fan, and particularly to a humidification control device for a hot air fan.

Conventionally, the amount of heating was generally controlled by on/off or
In many cases, the amount of heating (amount of combustion) is controlled using Hi/Lo control. Also,
To solve the problem of rooms drying out when heated with warm air, it was necessary to manually adjust the amount of humidification and to use a humidifier that could change the amount of humidification. When used in conjunction with a humidifier in this way. If the amount of combustion were automatically changed depending on the room temperature, the amount of humidification would become too large or too small, and it was necessary to reset the amount of humidification each time. The present invention was made in view of these points. Once the humidification amount is set according to the size of the room, the humidification is automatically set according to the combustion amount. It is an object of the present invention to provide a control device for a hot air fan that can control the amount of air and provide comfortable warmth.

Hereinafter, an example in which the present invention is implemented in an oil hot air fan will be explained.

FIG. 1 is a sectional view of an oil hot air heater. In the figure, 1 is a main body case, and an operating section 12 including a control device is provided on the front surface of the main body case. Inside the case 1, there are a heat exchanger 3, a convection fan 6, a combustion fan 5, an oil tank 7, a pump 8, an ignition heater 4, and the like.

Combustion air is taken in by the combustion fan 5 from the intake cylinder 11, and is supplied from the intake passage 17a of the damper device 17 to the combustion side passage 17c and the bypass passage 17b depending on the opening degree of the damper. The damper 17 has a structure as shown in FIG. 6A, and has a rotating portion 105, and the rotating portion 105 is provided with openings 106 and 107. The rotating portion 105 is connected to a gear 109 by a shaft 108, as shown in FIG. The pulse motor 66 has a connection diagram as shown in FIG.
By applying the specified pulse input, clockwise rotation,
Or turn left. Therefore, the rotating part 10 of the damper
5 is rotated by a pulse supplied to the pulse motor, and as a result, the ratio of the amount of combustion air supplied to the combustion side passage 17c and the amount of supply to the bypass passage 17b can be changed.

The burner 2 in FIG. 1 is made of porous ceramic, and is sprayed with petroleum by a pump 8 to become immersed in petroleum. Further, reference numeral 9 denotes a return passage for returning residual oil sprayed onto the burner 2 from the pump 8 to the oil tank 7.
When the burner 2 is immersed in oil, the amount of air sent from the combustion passage 17c to the burner 2 is Q, and the amount of combustion vaporized and combusted from the burner 2 is q, as shown in Fig. 7. q is approximately proportional to Q. Therefore, the combustion amount q can be proportionally controlled by the pulses supplied to the pulse motor 66 in FIG. 6B.

In addition, in FIG. 6B, 112 is a cam provided on the shaft 108, which operates the micro switch 111 for detecting whether the damper opening is at the maximum or minimum. In other words, when detecting the damper rotation position where the damper is at its maximum opening and the combustion amount is maximum, the damper opening 106
However, when the state as shown in FIG. 6A is reached, the lever 113 of the micro switch 111 becomes a cam 112 that is pushed upward in the figure.
The micro switch 111 is operated at this damper opening degree.

Indoor air is sucked in through the suction port 15 by the convection fan 6, undergoes heat exchange with the heat exchanger 3, and is discharged from the discharge port 14. The intake air is detected as a representative temperature of the room by a room temperature detector 16 such as a thermistor.

Further, 18 is a temperature detector that detects the temperature of the heat exchanger, and 13 is an outlet for a humidifier provided on the top surface of the hot air fan.

FIG. 2 is an external view of an operating section provided on the front side of the control section 12 in FIG. 1.

Fluorescent display tube 20, buzzer 21, keys 22-2
6. It has a timer section consisting of light emitting diodes 27a to 27c, a function switch 28, a timer operation key 29, etc., and an operation operation section consisting of a light emitting diode 27d and start/stop keys 30 and 31.

32 is a temperature setting device for setting the room temperature.

Further, 33 is a humidification amount regulator.

Reference numeral 34 is an oil level indicator composed of 4 LEDs, which indicates the amount of remaining oil based on the signal from the oil level detector.

FIG. 3 is a control circuit block diagram of the hot air fan shown in FIG. 1, showing one embodiment of the present invention.

In FIG. 3, 63A is a power cord, to which, for example, a 100V commercial power source is connected. 56 is a filter section including a line filter and a surge absorber. 57 and 58 are temperature fuses and safety thermoswitches, which are the final safety devices. The 100V line has a power transformer 5 for the electronic circuit of the control device.
4 forms a power supply unit 64, and 55 is a circuit unit that supplies various DC and AC power supplies to the control circuit.

The control device is mainly composed of an electronic control section 65 consisting of a central processing section 41 and the like.

The central processing unit 41 receives a power supply (50/
60Hz) A power synchronization signal is received from the synchronization signal generator 40 and is used as the basic unit of time for all.

The second input signal is a room temperature detector 16, a room temperature setter 32, a heat exchanger temperature detector 18, and a humidification amount setter 3.
It is 3.

These are all analog signals, and are detected as digital signals by an analog switch 39 and selectively via a voltage/frequency converter (V/F converter) 38.

The third input is an input operation key group 35 comprised of the above-mentioned number keys, operation keys, etc., and is used by the user to input input commands to the control device. The fourth input is other detection inputs 37 such as a wind pressure switch, a float switch for detecting that water has entered the oil tank, and an earthquake damping switch that is activated when an earthquake occurs.

The central processing unit 41 has a display output unit consisting of a fluorescent display tube 20, a group of LEDs 27 for displaying operating status and memory, a group of LEDs 34 for indicating an oil level abnormality, and a buzzer 21 for issuing an alarm. ing. The relay 59 is used to turn on and off the main circuit of the 100V line through its contacts.

The humidifier outlet 13, the ignition heater 4, the pump 8, the combustion fan 5, and the convection fan 6 are turned on/off or controlled in speed by thyristors 44a to 44c, respectively. Thyristor 44a-4
4d is insulated by photocouplers 42a to 42d, and outputs the output signal from the central processing section 41 to the transistor 4.
3a to 43d. Therefore, the thyristors 44a to 44d are turned on and off by the output signal of the central processing section 41. Note that the diode 61,
Zena diode 62, capacitor 63, resistor 60
constitutes a gate power supply for driving the thyristors 44a to 44d. The thyristor 44e has a resistor 45 and a bridge diode 4.
6. A synchronous power supply composed of a Zena diode 47, a capacitor 49, resistors 48e, 48f,
48g, 48h, programmable union transistor (PUT) 50 resistor 51,5
The relaxation oscillation circuit is configured to be driven by a pulse transformer 53 which outputs the pulse output of the relaxation oscillation circuit. Central processing unit 41
The output for controlling the convection fan 6 is the photocoupler 42.
Output by e, 42f, 42g, 42h,
The resistors 48e, 48f, 48g, and 48h are selectively turned on and off. Resistor 48e~4
8h are each weighted at a predetermined ratio, and the charging speed of the capacitor 49 can be controlled in 16 ways. Therefore, the convection fan 6 is controlled at 16 rotational speeds including stopping.

A more detailed embodiment of the electronic control section 65 in FIG. 3 is shown in FIG.

FIG. 4 shows the electronic control unit 65 using a 4-bit 1-chip microcomputer (μ-P).
This is an example of realizing this. In FIG. 4, 200 is a microcomputer (hereinafter referred to as μ-P).

The μ-P200 has an architecture as shown in FIG. It is MN1400 (manufactured by Matsushita Electronics Co., Ltd.), and its explanation will be omitted.

In FIG. 4, μ-P200 outputs the outputs of C ₀ to _{C 3} among the discrete C outputs (C ₀ to C ₁₁ ) as so-called scan outputs.

The scan outputs _C0 to _C3 are arranged in a matrix with the D outputs ( _D0 to _D7 ) to drive a generally well-known dynamic drive fluorescent display tube 20. That is, the scan outputs of C ₀ to _{C 3} dynamically drive the grids of each digit, colon, and AM/PM digit of the fluorescent display tube as shown in the figure, and the outputs of D ₀ to _{D 7} serve as data to the 7-segment anode and , is configured to drive the anodes of Colon AM and PM. Therefore, each digit of the fluorescent display tube, colon, AM,
Since PM etc. can be displayed as desired by the μ-P200, it is possible to display a clock, ignition/extinguishing time, etc.

The C ₀ to C ₃ outputs are simultaneously connected to the C ₄ and C ₅ outputs through transistors 73a to 73d, 71a, 71b, 7
2a and 72b form a matrix. Each intersection of the matrix is the aforementioned operating status display LED 27d, timer operation display LED 27c,
There are memory display LEDs 27a and 27b, and remaining oil amount display and abnormality display LEDs 34a to 34d. These LEDs are dynamically driven by the scan output of C ₀ to C ₃ and C ₄ and C ₅ , and each LED is independently controlled. It can be lit or blinking. C ₀
The ~ _C3 scan output also forms a matrix with the _A0 ~ _A3 inputs, and the AM/PM selection key 22,
Number keys 23, 24, 25, function switch 28 contacts, clear u 26, operation key 3
0, the stop key 31, the timer operation key 29, and the damper position detection switch 111 are A ₀ to A ₃ inputs,
It is placed at the intersection with the C ₁ , C ₂ , and C ₃ outputs, and can be determined independently as input data.

Note that a diode (not shown) can be inserted in series with each switch to avoid data confusion. In addition, the intersections of A ₀ to A ₃ inputs and C ₀ are connected to diodes 75a to 75d and resistors 120a to 120.
d, data is input by transistors 74a to 74d. The transistors 74a to 74d have Zener diodes 76a to 76d, each having a different voltage at which the Zener characteristic occurs, connected to their bases, and the Zener voltage V _Z of each Zener diode is
gradually increases with a constant voltage difference. for example
If Zener diodes with V _Z of 8V, 7V, 6V, and 5V are selected as 76a to 76d, and the voltage across the variable resistor 77 is appropriately selected using resistors 78 and 79, the movable contact of the variable resistor 77 can be As the position moves from top to bottom in the diagram, each transistor 74
A to 74d become non-conductive one by one from the fully conductive state, and input to μ-P200 [A ₀ , A ₁ , A ₂ , A ₃ ]
are [0000], [1000], [1100], [1110],
It changes depending on the position of the movable contact of the variable resistor 77, such as [1111].

The variable resistor 77 is configured to rotate according to the residual oil level, as shown in FIG. 10. In Figure 10, 121 is a cartridge tank, 17 is an auxiliary tank (fixed to the hot air fan)
It is.

Reference numeral 125 denotes a spring, which changes the vertical position of the tank depending on the weight of the oil in the cartridge tank. Therefore, since the cartridge tank 121 moves up and down depending on the amount of remaining oil, the rack 122 attached to the cartridge tank 121 also changes its position up and down. Rotate gear 12
3 rotates, and the shaft 124 of the gear 123 also rotates, so if the variable resistor 77 is linked to this shaft 124, the amount of remaining oil is detected as the position of the movable contact of the variable resistor 77, and the amount is transferred to the μ-P200 described above. A ₀ ~
_A3 input is the data on the amount of remaining oil. 16,18
is a thermistor, and the room temperature and the temperature of the sintering exchanger are converted into voltage by correlation with resistors 16' and 18'. Further, 32 is a variable resistor, and the potential of the movable contact of the variable resistor is supplied as a room temperature setting signal. Reference numeral 33 supplies a humidification amount setting signal as a voltage value. These four signal voltages are sent to each input of analog switch 39. The analog switch 39 is, for example, μPD4066C (manufactured by NEC Corporation), and selectively inputs one of the four inputs to the voltage frequency converter (V/F converter) 38 using the E ₀ to E ₃ outputs of μ-P200. It is something. The V/F converter 38 is, for example, a V/F converter (RC4151) manufactured by Raytheon Corporation, and the pulse frequency output from the output terminal changes depending on the input voltage level.

The output of the V/F converter 38 is μ-P200
It is possible to count the input pulses input to input _S1 of . Therefore, with μ-P200, the above 2
The two detection signals and the setting signal can be detected using digital signals called pulse numbers.

80 and 81 are latches, for example μ
It is a D latch such as PD4042C (New Nippon Electric). The latches 81 and 80 are of μ-P200 respectively.
Data is input through E ₀ to E ₃ outputs. and
The C ₆ and C ₇ outputs control the data latch and the Z state of the data path, respectively. The Q output of each latch is connected to transistors 70a-70d,
and 70a-70h, and the transistors 70a-70h drive photocouplers 42a-42h, respectively. Therefore, the μ-P 200 can independently control the speed of the convection fan 6 and control the on/off of the combustion fan 5, pump 8, ignition heater 4, and humidifier outlet 13.

Output C ₈ of μ-P200 is main relay 59
are turned on and off by a transistor 68. Outputs C ₉ and C ₁₀ are transistors 67a and 67
b generates a pulse output for rotating the pulse motor 66 in the forward and reverse directions. μ-P20
0 is a damper position detection switch 111 that changes the damper opening degree by outputting an output pulse to C ₉ and C ₁₀
After the maximum opening position is obtained, the number of pulses issued in the forward and reverse directions is stored in the RAM as data.
I remember it inside. Therefore, the damper opening degree can be determined with only one switch (111) input.
The _C11 output is transmitted to the voltage buzzer 21 by a multivibrator composed of transistors 69a and 69b.
to drive. Therefore, an alarm can be generated when necessary.

The S ₀ input of μ-P200 is connected to the collector of transistor 82, and the base of transistor 82 is connected to e ₃ via a resistor.

AC power is supplied to e ₃ as shown in FIG. Therefore, the collector of transistor 82 is
Generates a signal synchronized with the power supply (50/60Hz). Therefore, the μ-P200 can count various times based on the power supply frequency (50/60Hz) by counting the input of _S0 .

Note that the capacitor 85 is μ-P2 when the power is turned on.
Capacitor 8 for resetting 00
3. Resistor 84 is for determining the processor cycle of μ-P200.

Further, 37a is a switch that opens when an earthquake is detected, and is incorporated in a seismic sensing device (not shown).

37b is a contact point of a float switch (not shown) provided in the auxiliary oil tank 17 for detecting water contamination. 37c is a contact point of a wind pressure switch (not shown) provided in the combustion air flow path. These three switches are configured to input sensed data to the B ₀ -B ₂ inputs of μ-P200. Therefore, μ-P200 can determine what kind of abnormality has occurred.

FIG. 5 shows a specific example of the power supply section 64 in FIG. In the figure, 89, 90, 102, 103,
104 is a diode, 99 is a diode bridge, 91, 94 are transistors, 92, 95, 1
00 is Zena diode, 86, 87, 88, 9
7 and 98 are capacitors, and 93, 96, and 101 are resistors. E ₁ to E ₅ and e ₁ to _{e 3} in the figure are E ₁ in Figure 4.
~ _E5 , connected to _e1 ~ _e3 .

The specific configuration for implementing the present invention has been described above.

FIG. 8 is a diagram for explaining the present invention, and below,
This will be explained with reference to FIG. 8 and FIGS. 2 to 4. Whether operation key 30 is pressed or timer operation key 2
When 9 is pressed and the programmed ignition time is met, the μ-P 200 enters ignition operation. Therefore, the _C8 output is set to Hi, and pulses are outputted by _C9 or _C11 until an input is received from the switch 111, and the damper is set to the maximum opening. Further, data of the latch 80 is inputted and latched by the outputs _E0 to E3 and the output _C7 so that the thyristors 44b, 44c, and 44d are conductive to operate the ignition heater 4, pump ₈ , and combustion fan 5. Therefore, when the hot air fan is ignited, it starts with maximum combustion. This state is time t ₀ in FIG.

The temperature of the heat exchanger is controlled by an analog switch 39,
Since the number of pulses is input to _S1 by the V/F converter 38, the μ-P200 can monitor the temperature of the heat exchanger (detected by the thermistor 18), and when the temperature rises to a predetermined temperature, ignition is completed. It is determined that the data of the latch 80 is changed by the E ₀ to E ₃ outputs, and the thyristor 44b is turned off. At the same time, the LED 27d is changed from flashing to lit to indicate that the ignition has ended. Also latch 81
By changing the data, the phase angle of the thyristor 44e that drives the convection fan 6 is changed (the convection fan 6 is stopped during ignition), and the speed is controlled so that the temperature of the heat exchanger is at a predetermined level. At this time, the change in the phase angle of the convection fan (change in the data of the latch 81) is performed at a fixed time period based on the time constant of the heat exchanger.

This point corresponds to time _t1 in FIG. time t ₁
When the convection fan starts rotating, thermistor 16
As shown in Figure 8, the room temperature Troom that was detected in 2008 often decreases a little and then starts to rise. Therefore, μ-P200 is the time when the room temperature detected from S ₁ showed the lowest temperature after the operation started.
Predetermined temperature increase ΔT from t ₁ . (For example, 1ded) We counted the time until time t ₂ until it rose, measured the dead time τ in the heating load state of the room where the hot air fan is placed, and performed the calculation process τ′ = α + βτ in the RAM. After that, store it. However, α and β are arbitrary constants.

After that, the hot air fan continued to burn at its maximum until the temperature reached room temperature.
Troom controls combustion so that the set temperature Tset set by the setting device (variable resistor) 32 is reached. This combustion control method uses the aforementioned τ' to control the combustion amount.

The μ-P200 takes in Troom as data from the _S1 input terminal at predetermined time intervals.
Detected the time interval for capturing Troom, Δt.
When the change in Troom is ΔTd and the difference from the setting is ΔTp, μ-P200 ideally changes the combustion amount q based on the calculation result as shown below. In other words, if the amount of combustion up to now is qo, then q=qo+A・ΔTp・+B・ΔTd/Δt・exp[−t
/τ′] Change the combustion amount q so that However, A, B
is an arbitrary constant. This operation is performed by driving a pulse motor using the output pulse of the output C ₉ or C ₁₀ of μ-P200 and changing the damper opening degree.

In the above equation, it is difficult to realize the term ΔTd/ΔTexp [-t/τ'] including a time variable with the low-cost 4-bit microcomputer μ-P200 used in this embodiment.

Therefore, if we replace the term B・ΔTd/Δt・exp[−t/τ′] with a term that does not change over time and remove that term after a certain period of time, this can be achieved relatively easily, and the Good characteristics can be obtained.

That is, when changing the combustion amount, the combustion is performed at an amount of q = qo + A.ΔTp + B. That is, q=qo+A・ΔTp+[B・ΔTd/ΔT・1/τ′]
〓′o.

By using such a control method, the eighth
In the figure, after reaching the set temperature Test at t ₃ , for example, even if the room temperature suddenly drops due to ventilation in the room at t ₄ , the combustion amount of Troom is controlled so that it immediately reaches Test. This can greatly improve comfort.

The aforementioned measurement of τ and calculation/storage of τ' can be done only when the hot air fan is started for the first time, but it is better to do it every time the hot air fan is operated to better track changes in the heat capacity of the room where the hot air fan is located. It is advantageous.

Next, we will discuss the control method for the humidifier outlet.

The humidifying outlet 13 is turned on and off by a thyristor 44a. In μ-P200, where q is the combustion amount and D is the time ratio (duty) for energizing the humidifier outlet, K ₁ is an arbitrary constant that controls D so that D=K ₁ ·q. That is, the ratio of the on/off time of the thyristor 44a is q
It is controlled in proportion to. The humidification amount setter 33 determines the maximum value of D when the combustion amount q is maximum. For example, when the humidification amount setting device is at the maximum position, D=1 (thyristor 44a
remains on), and at the minimum position, D=
0 (the thyristor 44a remains off), the desired maximum humidifying capacity can be set regardless of the humidifying capacity of the humidifier connected to the humidifier outlet, and the humidifying capacity can be set according to the combustion amount q. Since the amount changes, it is possible to prevent excessive humidification or insufficient humidification and to comfortably control the amount of humidification.

Further, at this time, one cycle period T _H that determines the on/off duty D of the thyristor 44a is determined by T _H =K ₂ +K ₃ ·τ' using the above-mentioned τ'.

As a result, the on/off duty D of the humidifier changes depending on the size of the heating load, so the amount of humidification can be achieved in accordance with the heating load without unnecessarily increasing the number of on/off cycles and shortening the life of the device. be able to.

Further, in the embodiment of the present invention, only the humidifier outlet is turned on and off, but it is clear that the humidifier may have a built-in humidifier.

As described above, according to the present invention, the on-off duty of the switch means connected in series to the humidifier or the humidifying outlet is controlled to be changed in proportion to the amount of combustion. It is possible to humidify at an almost appropriate average amount depending on the amount of heating without installing a special humidity sensor to detect the humidity of the indoor air, realizing highly comfortable heating at a relatively low price. It is possible to do so and has a very large effect.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a hot air fan showing an embodiment of the present invention, Fig. 2 is an external view of the operating section of the hot air fan, and Fig. 3 is a block diagram of a hot air machine control circuit showing an embodiment of the present invention. Figure 4 is a detailed diagram of the control circuit of the hot air fan,
Figure 5 is the power supply circuit diagram of the warm air fan, Figure 6 A, B,
C is a sectional view, external view, and circuit diagram of the damper and its driving device, Fig. 7 is a burner combustion characteristic diagram, Fig. 8 is an explanatory diagram of the operation of the hot air fan, and Fig. 9 is a system configuration diagram of the microcomputer. FIG. 10 is a configuration diagram of the oil tank. 3... Heat exchanger, 12... Control unit, 13... Humidifier outlet, 16... Room temperature detector, 32...
...Temperature setting device, 41...Central processing section.

Claims (1)

[Scope of Claims] 1. A heat source, a heating amount control means for controlling the heating amount of the heat source, a room temperature detection means for detecting a representative temperature of the living space, a room temperature setting means, and the room temperature setting means and the room temperature detection means. a control unit for controlling the heating amount control means according to a signal from the controller, a built-in humidifier or an outlet for a humidifying device, and a switch means in series with the humidifier or the outlet;
A control device for a hot-air fan, wherein the control section controls the switch means to turn on and off, and controls the on-off duty of the switch means to change depending on the magnitude of the heating amount. 2. The hot air fan according to claim 1, further comprising a maximum humidification amount setting means, and a duty of the switch means at the maximum heating amount based on a signal from the maximum humidification amount setting means. control device.