JPS62162852A - Controller of hot air flow machine - Google Patents

Abstract

PURPOSE:To make it possible to use the hot air flow machine in a safe and highly efficient state by detecting the temperature within the hot air flow machine and displaying an extraordinary state. CONSTITUTION:An operating portion 12 including a controller is provided on the front surface of a main body case 1. The temperature detector 18 of a heat exchanger 3 detects the overheat within the apparatus produced by the clogging of meshes of a filter. In A-D of display means 34, the natures of faults are displayed. When there is a fault in the hot air flow machine, a place where the faults have developed is displayed. For example, in a case where the temperature of the heat exchanger becomes higher than a predetermined valve, it is indicated in display means that there is a fault in a convection air system, and the fault is displayed so that whether there is clogging of filters provided at a suction port for sucking up air or not is checked. That is, an appropriate processing can be applied by observing a warning (for example, cleaning of filter) indicated in 'D' of the display means, and it is possible to prevent the hot air flow machine from falling into a more serious fault. Thus, the life of the hot air flow machine is prolonged, and generation of a dangerous state is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a control device for a hot air fan, and more particularly, to an improvement in safety and ease of use against clogging of the filter of a hot air fan.

Conventional hot air fans use a convection fan to convect indoor air to heat the room, and there is a risk that dust, dirt, etc. in the convective air may convect or adhere to the combustion part, adversely affecting combustion. There were many. For this reason, hot air fans are equipped with filters to prevent convection of dirt and dust. however,
This filter cannot completely remove dirt and dust, and after many years of use, it often causes abnormal combustion or overheating of the equipment1.Also, the filter itself This often caused clogging, resulting in the above-mentioned inconvenience. Therefore, conventional hot air fans are equipped with a temperature fuse or overheat prevention thermoswitch inside the device to prevent overheating, and are configured to stop the air flow when the device overheats.

Problems to be Solved by the Invention Such conventional overheating prevention devices only guarantee the ultimate safety of the equipment, and until the device is activated, the user has to prevent combustion conditions caused by filter clogging, etc. It was not possible to detect deterioration or overheating, and the fuel was often used in an inconvenient combustion state or in an overheated state.

Further, even if the overheating prevention device is activated and the operation is stopped, the user cannot know the cause of this and cannot easily perform maintenance and inspection.

Means for Solving the Problems The present invention has been made in order to eliminate such conventional drawbacks, and is constituted by the following means.

That is, it has a burner, a convection fan, an ignition device, and a control unit that controls them, and this control unit is combined with a temperature detector that directly or indirectly detects the temperature inside the hot air fan, and a display that displays abnormal conditions. and an electronic control section that receives a signal from the temperature detector and operates the display means.

Effect: This configuration prevents clogging of hot air fan filters, etc.
It is possible to detect this before the overheat prevention device, which is the ultimate safety device, is activated, and to display this abnormal condition to notify the user. Therefore, users should prevent the inconvenience of using hot air fans while they are overheated or in abnormal combustion states caused by clogged filters, and perform appropriate maintenance and inspections to ensure safe operation. It is possible to obtain the effect that the hot air fan can be used in a highly efficient state.Example The following describes an example in which the present invention is applied to an oil hot air fan.

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 tank 6, a combustion fan 6, an oil tank 7, a pump 8, an ignition heater 4, and the like.

Combustion air is taken in by the combustion fan 6 from the intake cylinder 11, and is supplied to the combustion side passage 17c and the bypass passage 17b depending on the opening degree of the suction passage 17 of the damper device 17 and the redamper. The damper 17 has a structure as shown in FIG.
06,107 is set. The rotating portion 106 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. 6(C), and is rotated clockwise or counterclockwise by applying a predetermined pulse input between terminals CR or C and L. Therefore, the rotary part 105 of the damper is rotated by the pulses supplied to the pulse motor, and as a result, the combustion side passage 17
The ratio of the amount of combustion air supplied to C and the amount of combustion air supplied to bypass path 17b can be changed.

The burner 2 in FIG. 1 is made of porous ceramic, and is immersed in oil after being flushed with oil by a pump 8. Also, 9 pumps 8 to burner 2
This is a return path for returning residual oil that has been sprayed onto the oil tank 7 to the oil tank 7.

When the burner 2 is immersed in oil, let Q be the amount of air sent from the combustion passage 170 to the burner 2, and let q be the amount of combustion vaporized and burned from the burner 2, and q is approximately proportional to Q. It is something. Therefore, the combustion amount q can be proportionally controlled by the pulses supplied to the pulse motor 6e in FIG. 6(b).

In FIG. 6(o), a cam 112 is installed on the shaft 108 and operates a microswitch 111 for detecting whether the damper opening is at its maximum or minimum. That is, in order to detect the damper rotation position where the damper is at its maximum opening and the combustion amount is maximum, when the damper opening 106 is in the state shown in FIG. 6(a), the lever of the microswitch 111 is 113 is a cam 112 that is pushed upward in the figure;
The microswitch 111 is operated at this damper opening degree.

Indoor air is sucked in through the suction port 15 by convection 7 and 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 detects overheating inside the device caused by clogging of the filter or the like. Moreover, 13 is an outlet for a humidifier provided on the top surface of the hot air machine.

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

In the figure, 2o is a fluorescent display tube that displays the time.

The function switch 28 is a four-contact changeover switch, and when it is moved to the left (C1ock, dj,) position from the position shown in the figure, the clock can be adjusted. Function switch 28 wo C1ock Adj.

By pressing the key 22 in the position , AM or PM can be selected. Pressing the key 22 once will set the time in the morning, and pressing it again will set the time in the afternoon.

Each time 23 to 26 is pressed, 1 is added according to each digit.
It is a numeric key that adds up in increments, and key 23 is the 1 o'clock digit,
24 is 10 minutes, 26 is 1 minute, and each digit is added each time it is pressed. The key 26 is a clear key used to cancel input commands input to the control unit using the numeric keys 23 to 26 or the like.

When the function switch 28 is moved to the right position in the figure, that is, ON e Prog position or OFF*Pro (position), the corresponding LICD 27m, 27b (light emitting diode) will blink, and the ignition time (or extinguishing time) can be programmed. The ignition time and extinguishing time can be programmed and stored in the same way as clock adjustment.Also, when the ignition or extinguishing time is programmed,
When the function switch 28 is returned to the illustrated position, the corresponding LKDs 27a and 27b are turned off and the memory is displayed. Incidentally, at this time, the fluorescent display tube 2o becomes a clock display, and the display is incremented every minute.

29 is a method for giving an input signal to the control device to automatically operate the warm air fan (timer operation) when the programmed ignition time or extinguishing time matches the time ticked by the clock. When the timer operation key is pressed - times, LKD27c flashes to indicate that the warm air fan is operating on the timer.

In this case, blinking the LKD27C has the effect of strongly indicating that the timer is operating than lighting, and reduces the possibility of the user accidentally leaving the house while pressing the timer operation key. Also, if you press the timer operation key again,
The blinking of KD27c can be stopped and the timer operation can be stopped.

That is, the timer operation according to the programmed contents can be started and stopped with one touch using the timer operation key.

Keys 30 and 31 are operation start/stop keys for the warm air fan, and when the operation start key 3o is pressed, the operation status display LKD2 is pressed.
7d flashes to indicate that ignition is in progress and the ignition operation begins. The LED 27d finishes igniting, the temperature of the heat exchanger rises to the specified temperature, and the convection fan begins to rotate.
When hot air starts to be discharged, the light changes from blinking to lighting up. When the stop key 31 is pressed, the hot air fan goes into extinguishing operation and the LED 27 turns on.
d blinks at a longer cycle than when the heat is ignited, indicating that the heat exchanger is extinguished until the temperature of the heat exchanger drops sufficiently and the convection fan stops.

32 is a temperature setting device, which is used to set the room temperature.

Further, 33 is a humidification amount regulator.

Reference numeral 34 denotes an oil level indicator composed of four LEDs, which displays the amount of remaining oil based on the signal from the oil level detector. For example, when displaying with 4 LEDs, if there is 8 oil in the oil tank, the rightmost LED in the diagram will change from lighting to blinking when the remaining oil amount goes from 8 to 7, and 7/8. The amount of remaining oil is displayed.

In other words, the three LEDs from the left are lit, and the one on the right
A state in which only D is blinking is shown.

As a result, the amount of remaining oil can be displayed in 8 stages using 4 LEDs. Furthermore, when the amount of remaining oil decreases to a certain level, for example, when the amount of remaining oil decreases to 1/8 (at this time, the leftmost LED blinks and the other three LEDs are off), the buzzer will open. A buzzer installed inside the oil pump 21 issues an oil-out alarm.

The remaining oil amount display LED 34 is composed of four independent LEDs, and also serves as an abnormality display device.

Items M to D in the figure display the contents of the abnormality corresponding to the four LEDs, and if there is an abnormality in the hot air fan, it is displayed where the abnormality is.

For example, when the temperature of the heat exchanger becomes higher than a predetermined value, an error message is displayed indicating that there is an abnormality in the convection air system, and an abnormality message is displayed to check whether the filter provided at the suction air intake port is clogged. In other words, in the IID column 34,
If only the LED corresponding to D remains lit and the other three blink at the same time, the user will first understand that there is an abnormality, and only LED 34 corresponding to DK will remain lit and blink incessantly. Therefore, you can prevent the warm air fan from developing into a more serious abnormality by taking appropriate measures based on the precautions displayed in D (for example, cleaning the filter). It can extend the life of the fan and prevent dangerous situations from occurring.

Although not shown in FIG. 1, a wind pressure switch that turns on and off at an appropriate pressure difference is installed in the supply and exhaust passage, and when the wind pressure switch does not operate even if the burner motor 6 is operating, the air supply and exhaust line In this case, for example, the LED corresponding to C of LKD34 in FIG.
If only the LED 34 lights up and does not blink, and the other 3 LEDs 34 blink and is OK, the user will easily know if the air supply and exhaust are clogged. be able to.

In this way, the LED rows 3 and 4 are used to display the remaining oil level and only when there is an abnormality, to indicate an abnormality.
It is used extremely effectively and can display residual oil and abnormalities at low cost.

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

In Figure 3, 63 is a power cord, for example 100
v commercial power supply is connected. 66 is a filter section including a line filter and a surge absorber. 67.5
8 is a temperature fuse and a safety thermoswitch, which is the final safety device. The 10QV line has a power transformer 64 for the electronic circuit of the control device, forming a power supply section 64,
65 is a circuit section that supplies various DC and AC power sources to the control circuit.

The control device is mainly composed of an electronic control section θ6 consisting of a central processing section 41 and the like.

The central processing unit 41 receives a power source (so/s) as an input signal.

Hz) A power synchronization signal is received from the synchronization signal generator 4o, and is used as the basic unit of time for all.

The second input signals are a room temperature detector 16, a room temperature setter 32, a temperature detector 18 that detects the temperature of the heat exchanger, and a humidification amount setter 33.

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

The third input is an input operation key group 35 comprised of the aforementioned 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 that detects when water has entered the oil tank, and an earthquake damping switch that is activated when an earthquake occurs.

The central processing section 41 has a display output section consisting of a fluorescent display tube 20, an LED group 2 for displaying operating status and memory, an LED group 34 for indicating oil level abnormality, and a buzzer 21 for issuing an alarm. are doing. Relay 59 is used to turn on and off the main circuit of line 100'/line through its contacts.

The humidifier outlet 13, ignition heater 4, pump 8, combustion 77 fan 6, and convection fan 6 are each connected to a thyristor 44a.
It is turned on/off or speed controlled by ~44C. Thyristors 441-44d are photocouplers 42a-
42d, and supplies the output signal of the central processing unit 41 to the transistors 43a 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, and resistor 6° constitute a gate power source for driving the thyristors 44a to 44d. The thyristor 44el has a resistor 45,
A synchronous power supply composed of a bridge diode 46 and a zener diode 47, a capacitor 49, a resistor 48θ,
48f, 48g.

It is configured to be driven by a relaxation oscillation circuit comprising a 48h1 programmable union transistor (PUT) 50, resistors 51, 52, etc., and a pulse transformer 53 that outputs the pulse output of the relaxation oscillation circuit. The output for controlling the convection fan 6 of the central processing unit 410 is provided by photocoupler 426, 42f.

42g, 42h output, and the resistor 38el
, 48f', 4B[, 48h are selectively turned on and off. The resistors 488 to 48h 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 to have 16 rotational speeds including stopping.

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

Figure 4 shows a 4-bit 1-chip microcomputer (μ
This is an example in which the above electronic control unit 66 is realized using the electronic control unit 66 (mP). In FIG. 4, 200 is a microcomputer (hereinafter referred to as μ-P). μmP2O0 has a configuration as shown in FIG. 7, but since it is a well-known one-chip microcombinator, a detailed explanation of its configuration will be omitted.

. In FIG. 4, μmP2O0 is disk IJ-toC
Among the outputs (CO to C11), the output of c(,,c3) is
It is output as a so-called scan output. The scan outputs CQ and C3 are arranged in a matrix with the D outputs (Do to D7) to drive a generally well-known dynamic drive fluorescent display tube 2o. That is, the scan output of CO to C3 dynamically drives each digit of the fluorescent display tube, the colon, and the grid of λM/PM digits as shown in the figure, and the n□-D7 output is 7 as data.
It is configured to drive the anodes of the segment and the anodes of the columns M and PM. Therefore, each digit of the fluorescent display tube, such as colon, M, PM, etc., is μ
Since mP2O0 can be displayed arbitrarily, it is possible to display the ignition/extinguishing time of the clock display 1, etc.

c(,,c3 output is simultaneously connected to c4.'c5 output,
Transistors 731L to 73d, 711L,
71b.

A matrix is formed via 72'L and 72b. Each intersection of the matrix is the driving status display LK mentioned above.
D27d, evening (7 operation display IED27c.

There are memory display LKD27a, 27b, and remaining oil amount display/abnormality display Lli:D34a to 34d.These LEDs are dynamically driven by the scan output of C○ to c3 and c4 and c5, and each llCD can be lit or turned on independently. It can be made to blink.

CO~C3 scan output is also human. ~A3 Forms a matrix with human power, AM/PM selection key 221, number keys 23, 24, 25, each contact of function switch 28, clear key 26. The operation key SO, the stop key 31, the timer operation key 9, and the damper position detection switch 111 are operated by AQ to M3 manually, c, c2. They are placed at the intersection with the c3 output and can be independently determined as input data.

Note that a diode (not shown) is inserted in series with each switch to avoid data confusion.

In addition, the intersection point between MU0~3manpower and CO is diode 7.
6&~76d1 resistor 120a~120+1.

Data is input from transistors 741 to 74d. The transistors 74 &~74a are Zener diodes 76'a- each having a different voltage at which Zener characteristics occur.
~76d is connected to its base, and the Zener voltage vz of each Zener diode increases with a constant voltage difference in try<. For example, sV.

76 Zener diodes with Vz of 7V, eV, sV
&~76d, and if the voltage across the variable resistor 77 is appropriately selected using the resistor 78.79, the variable resistor 77
As the position of the movable contact moves from top to bottom in the figure, each transistor 742L to 74d changes from fully conductive to 1
The input CAo, A to μmP2O0 gradually becomes non-conductive.
1. A2. A3) is (1000) in order from (oooo)
, (:1100).

Variable resistor 77 like (1110), (1111)
It changes depending on the position of the movable contact.

The variable resistor 77 is configured to rotate according to the residual oil level, as shown in FIG. 8th
In the figure, 121 is a cartridge tank, and 1 is an auxiliary tank (fixed to the hot air fan). A spring 126 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 1 attached to the cartridge tank 121
22 also changes its position up and down. Therefore, the gear 123 rotates and the shaft 124 of the gear 123 also rotates.
If the variable resistor 7 is linked, the amount of remaining oil will be determined by the variable resistor 77.
is detected as the position of the movable contact, and the above-mentioned μmP2O
The amount of labor needed to reach 0 is the amount of remaining oil. 16
．． 18 is a thermistor, and the room temperature and the temperature of the heat exchanger are converted into voltage by correlation with resistors 16' and 1B'.

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, μP.
D40660 (manufactured by NEC Corporation), and the E of μmP2O0
One of the four inputs is selectively input to the voltage frequency converter (V/F converter) 38 by the outputs ◯ to E3. 'I' / F core Herme 38 is, for example, Raytheon's v/F converter (RC4151)
The pulse frequency output from the output terminal changes depending on the input voltage level.

The output of the V/F coy-verter 38 is input to the input S1 of μmP2O0, and input pulses can be counted. Therefore, μmP2O0 allows the two detection signals and the setting signal to be detected as digital signals called pulse numbers.

80 and 81 are latches, for example μPD4042
It is a D latch such as C (New Nippon Electric). Latch 81.
80 are inputted with data by the EO to E3 outputs of μmP 200, respectively. The two states of data latch and data bus are controlled by the C6 and C7 output traps, respectively. The Q output of each latch is configured to drive transistors 7o8 to 70d and Cl: 706 to 7oh, and the transistors 7011 to 70h drive photocouplers 421 to 42h, respectively.

Therefore, μmP2O0 can independently control the speed of the convection fan 6, and control the on/off of the combustion fan 6, pump 8, ignition heater 4, and humidifier outlet 13.

The output C8 of μmP2O0 turns on the main relay 59 using the transistor 68.

Outputs C'9 and C10 are transistors 67a and 67
b generates a pulse output to rotate the pulse motor 66 in the forward and reverse directions. μmP2O0 is C9,”
The damper opening degree is changed by outputting an output pulse to 10, but after the maximum opening position is obtained by the damper position detection switch 111, the number of harnesses output in the forward and reverse directions is stored in the RAM as data. ing. Therefore, the damper opening degree can be determined by inputting only one switch (111).

The C11 output drives the piezoelectric buzzer 21 by a multivibrator composed of transistors 691L and 69b. Therefore, an alarm can be generated when necessary.

The s□ input of μmP2O0 is connected to the collector of a transistor 82, and the base of the transistor 82 is connected to C3 via a resistor.

AC power is supplied to C3 as shown in FIG. Therefore, the collector of transistor 82 is connected to the power supply (50/
60H2).

Therefore, μmP2O0 can count various times based on the power supply frequency (50760H2) by counting the input of So.

Note that the capacitor 86 is for resetting μmP2O0 when the power is turned on, and the capacitor 83 and resistor 84 are for determining the processor cycle of μmP2O0.

Further, 372L 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. 3
70 is a contact point of a j pressure switch (not shown) provided in the combustion air flow path. These three switches are μmP2
It is configured to input detection data to BQ and B2 manual power of O0. Therefore, μmP2O0 can determine what kind of abnormality has occurred.

FIG. 6 shows a specific example of the power supply unit 64 in FIG. In the figure, 89, 90, 102, 103° 104 is a diode, 99t; t diode bridge, 91.94 is a transistor, 92, 95, 100 is a Zena diode, 8
6.87.88, 97°98 is a capacitor, 93.96
．． 101 is a resistor. E1-E5, 151-e in the figure
3 is connected to E1-ES and 01-e3 in FIG.

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

Effects of the Invention The present invention includes a temperature detector that directly or indirectly detects the temperature inside the device, a display unit that displays an abnormal state, and an electronic control unit that operates the display unit with a signal from the temperature detector. Therefore, it is possible to detect overheating or abnormal combustion of equipment caused by a clogged filter, etc., and notify the user of this before the final safety device for overheating prevention is activated.

Therefore, the user can carry out appropriate maintenance and inspection, so that the hot air fan can be used in a highly safe and highly efficient manner without using it in an unsafe condition.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hot air fan showing one embodiment of the present invention;
The figure is an external view of the operating section of the warm air fan, Figure 3 is a block diagram of the hot air fan control circuit showing an embodiment of the present invention, Figure 4 is a detailed diagram of the control circuit of the warm air fan, and Figure 6 is a block diagram of the warm air fan control circuit. Power supply circuit diagram of the hot air fan, Figure 6 (a), f). (C) is a sectional view, external view, and circuit diagram of the damper and its driving device, Figure 7 is a system configuration diagram of the microcomputer, and Figure 8 is a configuration diagram of the oil tank. , 4... Ignition device (ignition heater), 6... Convection fan, 12...
...Control unit (operation part), 18...Temperature detector, 3
4...Display means (abnormality display device), 66...
...Electronic control section. Name of agent: Patent attorney Toshio Nakao and 1 other person
6 Figure

Claims (3)

[Claims] (1) It has a burner, a convection fan, an ignition device, and a control unit that controls them, and the control unit includes a temperature detector that directly or indirectly detects the temperature inside the hot air fan and displays an abnormal state. A control device for a hot air fan, comprising a display means and an electronic control section that operates the display means based on a signal from the temperature detector. (2) A control device for a warm air fan according to claim 1, wherein the temperature detector is configured to detect the temperature of a heated part such as a heat exchanger of the hot air fan. (3) The hot air fan control device according to claim 1, wherein the display means displays the details of maintenance and inspection of the hot air fan.