KR910009358Y1 - Safety control device for hot air heater - Google Patents

Abstract

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Description

Safety controls of the warmer

1 is a cross-sectional view of a warm air fan for explaining the present invention.

2 is a block diagram of a warm air control circuit to which the present invention is applied.

3 is a detailed circuit diagram of the temperature sensing unit.

4 is a convection blower drive circuit diagram.

5 is a detailed circuit diagram of the safety control unit.

* Explanation of symbols for the main parts of the drawings

A ₈ : Temperature sensing part A ₉ : Convection blower drive

A ₁₆ : Safety control part R ₁ ~ R ₂₀ : Resistance

C _{1 to} C ₉ : condenser D ₁ , D ₂ : diode

Q _{1 to} Q ₄ : transistors ZD ₁ , ZD ₂ : zener diodes

OPD ₁ , OPD ₂ : photodiode OPT ₁ , OPT ₂ : phototransistor

AND ₁ , AND ₂ : AND gate OR ₁ to OR ₃ : OR gate

SW _{1 to} SW ₄ : Switch I ₁ and I ₂ : Inverter

T: Triac PL: Warning Light

BZ: Alarm

The present invention relates to a control circuit of a hot air fan using solid fuel, such as granular coal, and more particularly, to provide a control circuit for preventing burnout of a hot air fan by detecting a burst or overload condition of a hot air fan due to latent heat.

That is, the present invention relates to a control device for safe operation of a warm air fan that burns solid fuel and heats air and forcibly discharges the air into a room.

The applicant has filed Korean Utility Model Registration Application No. 87-l0985, "Automatic Control of Hot Water Boiler" (hereinafter referred to as "Senwon draft"). The unit is composed of a blower driving unit, a circulating pump driving unit, a driving motor unit, a recurrence time control unit, a fault alarm unit, and the like, so that it is possible to continuously supply solid fuel and automate fire treatment.

The operation of the motor and the blower is performed when the output of the chamber temperature sensing unit receives the low level signal and the driving motor and the blower are operated to supply fuel and burn the chamber temperature. When the motor stops and receives a command from the recursion time control unit, and the circulation pump drive unit operates to release heat, the output of the chamber temperature sensor is low level again, and the above operation is repeated.

For example, the recursive time control section of the source draft is a temperature of 85 ° C and arbitrary when a predetermined temperature is set (assuming 35 ° C) for long-term outing or lowering the temperature when the current chamber temperature in the boiler is assumed to be 85 ° C. During the recursion time between the set temperatures of 35 ℃, the recursive heat of 45 ℃ is detected, and the chamber temperature sensor outputs a high level signal state for a long time, so that the driving motor and the blower do not operate, and the solid fuel burned in the combustion chamber is burned. This is a device that maintains the ember continuously by operating the drive motor of the blower periodically even during the recursion time due to the recursive heat.

However, it is not easy to apply the control circuit as in the source draft to the warmer as in the present invention. In other words, in an indirect heating device such as a boiler, heated water is transferred to the room through a flow path, thereby indirectly increasing the temperature of the room. Since the temperature rises rapidly by receiving heat directly from the heating plate inside the hot air fan and the heated air is sent out to the room as it is, without the thorough safety measures for thermal management, the hot air fan itself becomes overheated due to latent heat generated during combustion of the solid fuel. There is a drawback that the temperature rises excessively.

In addition, another problem in the heater that directly heats the air, unlike the source draft is that the difference in the level of the temperature rises or falls rapidly because the heated air is delivered to the room as it is.

In order to solve this drawback, the present invention requires a safety control device to maintain the temperature of the air heated and discharged from the hot air fan at a predetermined temperature range stably. The main purpose is to provide a latent thermal overheating control circuit.

Another object of the present invention is to prevent burnout of the warm air fan due to overload by this device. When described in more detail based on the accompanying drawings as follows.

FIG. 2 is a block diagram of the entire blower control circuit to which the present invention is applied, and includes a time controller A ₁ for controlling the fuel supply motor driver A ₁₂ , a convection blower driver A ₁₃ , and a latent heat blower driver A _14. ), The time control unit (A ₂ ) for controlling the start time of the combustion blower driving unit (A ₁₅ ) is connected to the motor drive (A ₄ ) through the logic control unit (A ₃ ), the time control unit (A ₁ ), (A ₂₎ ) Is connected to a signal detection unit (A ₅ ) that detects the starting state of the fuel supply motor drive unit (A ₁₂ ) and gives the initial conditions so that the inter-stage control unit (A ₁ ), (A ₂ ) can be restarted for a set time, Counter units (A ₆ ) and (A ₇ ) connected to the time control unit (A ₂ ) have a convection blower through a convection blower drive (A ₉ ), a combustion blower drive (A ₁₁ ), and a latent heat blower drive (A ₁₀ ). drive section (a _13), latent heat of the blower drive (a ↑), combustion air blower and the drive (a ₁₅₎ is associated respectively When, in the convection fan drive (A ₉₎ and a combustion blower drive (A ₁₁₎ been simultaneously connected to the time control unit (A ₁₎ and the temperature to control the indoor temperature and the cold air prevents the sensing unit (A ₈₎ is connected to, In addition, the logic control unit A ₃ is connected to the safety control unit A ₅ for detecting the starting voltage of the fuel supply motor driving unit A ₁₂ or the over temperature state of the heat sink installed in the hot air heater and initializing all conditions.

3 is a detailed circuit diagram of the temperature sensing unit A _{8. The} temperature switch SW ₄ and the temperature detecting switch SW ₄ for preventing the air that is overheated above a predetermined temperature are supplied to the room. Are connected to the AND gate (ANA ₂ ), respectively, and their output terminals are respectively connected to the time control unit (A ₁ ) and the combustion blower drive (A ₁₁ ), but the other end of the switch for detecting the temperature (SW ₂ ) is the condenser (C ₉ ). And resistor R ₁₇ are connected in parallel to the time control unit A ₂ and the counter unit A ₇ .

FIG. 4 is a detailed circuit diagram of the convection blower drive A ₉ for preventing the discharge of air when the air heated in the hot air fan is below a predetermined temperature, and includes a counter part A ₆ and a temperature sensing part A ₈ . Inverter (I ₃ , I ₄ ) is connected in series to the output terminal of the OR gate (OR ₃ ) connected from, and the latent heat blower drive (A ₁₀ ) is connected, and a switch for preventing cold air between the inverters (I ₃ , I ₄ ). (SW ₃ ) is connected and photodiode (OPD ₂ ), resistor (R ₁₈ ) and light emitting diode (LED ₂ ) are connected in series, and phototransistor (OPQ ₂ ) and zener diode are connected to mono diode (OPD ₂ ). (ZD ₃ ), resistors (R ₁₉ , R ₂₀ ) and transistor (Q ₄ ) are connected to the convection blower driver (A).

5 is a safety control unit A ₁₆ of the present invention, in which a resistor R ₁ and a diode D ₁ are connected in series to a non-inverting terminal (+), but a capacitor C ₁ and a resistor R ₂ are parallel to each other. Connect the connected delay circuit and connect the distribution resistors (R ₃ , R ₄ ) to the inverting terminal (-) to integrate the signal output from the resistor (R ₇ ) and the capacitor (C ₄ ), and then the OR gate (OR ₁ ). The other end of the OR gate OR ₁ and the other end of the OR gate OR ₁ are connected to the output terminal OUT of the constant voltage circuit A ₁ in parallel with the light emitting diode LED ₁ , the resistors R ₅ , R ₆ , and the capacitor. (C ₂ ) is connected via an inverter (I ₁ ), and the input terminal of the constant voltage circuit (A ₁ ) is attached to the inner plate (4) or the heat sink plate (5) of the warm air fan to sense the actual temperature and in case of abnormal temperature is turned off thermal cut-out switch (PT ₁₎ and the heat sink switch (PT ₂₎ has been connected in series is connected to one end of teutaen register (Q ₂₎ that is between the cone Three (C ₇₎ are parallel and connected, OR gate (OR ₁₎ of the output stage has one end connected to the other end of the resistor (R ₈₎ and a capacitor of the AND gate (AND ₁₎ via a capacitor (C ₅₎ which is parallel connected ( C ₆₎ connected between jidoe one end of the resistor (R ₈₎ is connected in common to the base of the transistor (Q ₂₎ being connected via the output terminal and the resistor (R ₉₎ of the aND gate (aND ₁₎ the transistor (Q ₁ The collector of) is connected to the base of transistor Q ₂ with feedback resistor R ₁₀ connected to the base, and the collector of transistor Q ₂ has resistors R ₁₁ , R ₁₂ , zener diode ZD ₁ and a capacitor. (C ₆ ) by connecting _one end of the switch (SW ₁ ) to the parallel contact (SW ₁ a, SW ₂ b), the other end of the contact (SW ₂ b) is connected to the logic control unit (A ₃ ) and contact (SW) ₁ a) the other end of the aND gate (aND ₁₎ on, the aND gate (inverter output terminal (I ₂₎ and the photodiode ₍₁ OPD) and a resistor (R ₁₃ of the aND ₁₎ sikimyeo connection) and Diode (D ₂₎ a power supply (Vc) connected in series, and has the collector of the phototransistor (OPQ ₁₎ resistors (R ₁₄ -R ₁₅₎ and a Zener diode (ZD ₂₎ and a transistor (Q ₃₎ and a triac (T ) Is configured by connecting alarm (BZ) and warning lamp (PL) to generate warning sound and warning lamp in case of abnormality.

The following describes the effect.

First, in FIG. 2, when initial startup (power supply) is performed to drive the warm air fan, the time controller A ₁ outputs a signal of a predetermined period according to time.

Using the signal counted by the oscillation count in the time control unit A ₁ as an example, a time of about 1-5 minutes can be arbitrarily adjusted, and the motor driver 12 uses the fuel from the hopper 1 as a loss hole 2 as a signal. To control the combustion time. The signal set and output in this way operates the motor drive circuit A ₄ through the logic controller A ₃ .

By the operation of the motor drive circuit A ₄ , starting power flows to the motor driving unit A while the fuel supply motor (not shown) is started for the set time of the time control unit A ₁ . The ram 3 supplies the solid fuel of the hopper 1 onto the rostol 2 while reciprocating from side to side. At this time, when the temperature detected in the room is below the predetermined set temperature (eg 30 ° C.), the temperature sensing unit A ₈ operates the counting unit A ₇ to drive the combustion blower driving unit A ₁₅ . Given.

That is, when the periodic signal output from the counter unit A ₇ is used as the 4-minute cycle, for example, a signal of an appropriate divider (for example, 2 minute cycle) is outputted so that the solid fuel can be burned at the minimum phase.

Therefore, the periodic signal output from the counter unit A ₇ is to operate the combustion blower drive A ₁₁ to operate the combustion blower driving unit A ₁₅ . The air generated by the combustion blower (F ₁ ) is supplied to the rostol (2) through the wind blowing tube (4) to increase the combustion efficiency of the solid fuel.

On the other hand, the capacitor (C ₉₎ as an off-state temperature sensing switch (SW ₂₎ is in the state as described above, so that the temperature sensed at the indoor set temperature or less (30 ℃) installed in the interior 4 degrees or as a fifth help and The low signal through the resistor R ₁₇ initializes the time control unit A ₂ and the counter unit A ₆ to inoperate.

This allows the counter (A ₆₎ the low signal and the temperature output from the detection switch (SW ₂₎ the gate is at a low signal is input in the OR (OR ₃₎ and the inverter (I _3, I ₄₎ while passing through the latent heat of the blower drive (A ₁₀ Input low level signal to). As the latent heat blower drive unit A ₁₄ is operated by the latent heat blower drive A ₁₀ , the latent heat blower F ₂ circulates the air covered in the warm air.

At this time, if the temperature of the air rising in the hot air fan is below a predetermined temperature (30 ℃), the cold wind prevention temperature switch (SW ₃ ) is turned off because the convection blower drive (A ₉ ) and the convection blower drive unit (A ₁₃ ) Is inoperable and there is no air discharge.

As described above, when the temperature in the hot air heater exceeds the predetermined temperature (30 ° C.) due to the repeated heating operation of the motor driving unit A ₁₂ and the combustion blower driving unit A ₁₅ , the temperature switch SW _{3 for} preventing the cold wind and the switch for detecting the indoor temperature (SW ₂ ) is turned on.

Accordingly, the high level signal from the switch SW ₂ for detecting the indoor temperature operates the time controller A ₂ so that the counter A ₇ operates the combustion blower driver A ₁₅ at a predetermined period (for example, two minute intervals). To count. In addition, thereby, enter the high-level time control unit (A ₂₎ been input to the counter (A ₆₎ through a signal of a fifth-degree OR gate (OR ₃₎ a high level in the room temperature detecting switch (SW _2). Here too, the high level signal is input to the OR gate OR ₃ and is a signal for operating the convection blower drive unit A ₁₃ at regular intervals (for example, 4 to 5 minutes apart).

Therefore, the inverter I ₃ outputs the low level signal by the high level signal through the or gate OR ₃ . Then, the power supply Vc through the light emitting diode LED ₂ and the resistor R ₁₈ turns on the phototransistor OPQ ₂ and the toristor Q ₄ while operating the photodiode OPD ₂ .

Accordingly, the convection blower drive A ₉ triggers and operates the convection blower driver A ₁₃ connected through the resistor A ₁₉ . By the operation of the convection blower driver A ₁₃ , the convection blower F ₃ is activated in accordance with the set period signal of the counter A ₆ . At this time, when the temperature of the air heated by the solid fuel burned on the roaster 2 of the hot air blower reaches a maximum set temperature (eg 80 ° C.) or more, the temperature switch SW _{4 for} preventing the warm air of the swine detector A ₈ is Is off. As a result, a low-level bias voltage by the resistor R ₁₆ is inputted to the counter unit A ₇ to reset the low signal to the combustion blower drive A ₁₁ .

In addition, since the low level signal is also output from the AND gate AND ₂ , the combustion blower drive A ₁₁ and the combustion blower driving unit A ₁₅ are inoperative to solidify the solid fuel on the rostol 2. At the same time, the low-level signal output from the AND gate AND ₂ is input to the time controller A ₁ to initialize all the conditions, thereby stopping the supply of the solid fuel periodically supplied by the motor driver A ₁₂ .

However, since the temperature switch SW ₂ for detecting the indoor temperature in the temperature sensing unit A ₈ maintains the turned-on state, the time controller A ₂ controls the counter unit A ₆ to provide a convection blower drive A _9. By operating the convection blower drive unit (A ₁₃ ) is operated by the blower fan (F ₃ ) to periodically discharge the latent heat in the hot air fan.

As a result of the periodic operation of the convection fan, the latent heat of the solid fuel remaining on the rostol 2 is removed to prevent overheating of the hot air fan. Ondeu cut-out switch (PT ₁₎ has an inner plate is 4, the temperature rise of the surface temperature cut-out switch thereof (PT ₁₎ in the heat registers or more to a temperature above the set of the control apparatus is turned off.

Then, the operating power VD supplied to the constant voltage circuit VA is cut off through the transistor Q ₂ , the heat sink switch PT ₂ , and the temperature rise switch PT ₁₂ . Therefore, since the power supply Vc applied to each circuit is cut off through the output terminal OUT of the constant voltage circuit VA, the solid-state fuel combusted on the rostol 2 is naturally burned while the hot air control device stops all functions. It is being burned through.

Next, the safety control unit A ₁₆ will be described. Here, the safety control unit (A ₁₆ ) is a heat sink for the over-current state of the operating power supply (VD) supplied to the motor drive (A ₁₂ ) when the motor drive unit (A ₁₂ ) put the operation state by the motor drive (A ₄ ) This is to detect the switch PT ₂ and to prevent burnout of the drive motor.

Therefore, while the motor drive circuit A ₄ operates, the operating power supply VD supplied to the motor driving unit A ₁₂ is the non-inverting terminal of the comparator OP ₁ through the resistor R ₁ and the diode D ₁ . When an overvoltage is generated in the operating power supply VD, i.e., due to an overload of the driving motor, the comparator OP ₁ outputs a high level signal. This high level signal is input to one end of the AND gate AND ₁ through the OR gates OR ₁ -OR ₂ .

In addition, since the motor driving unit A ₁₂ is in operation, the actual power source of the driving motor VD is input from the motor driving unit A _{12, and} passes through the resistors R _11- R ₁₂ and the zener diode ZD ₁ . Since the rated voltage is generated, the signal of the high relay is input to the other end of the AND gate AND ₁ via the switch SW ₁ .

Therefore, the AND gate AND ₁ outputs a high level signal. A part of this high level signal is inverted through the inverter I ₂ and a low level signal is output, so that the power supply Vc through the diode D ₂ and the resistor R _{12 is} connected to the photodiode PTD ₁ . Lights up. As a result, the phototransistor OPTQ ₁ and the transistor Q ₃ are turned on to give a trigger signal to the triac T. Then, the triac T is turned on so that the driving power source VD is applied to the warning light PL and the alarm BZ, indicating that an abnormality has occurred as an alarm sound or a warning light. In addition, a high level signal output from the soil-and Gay (AND ₁₎ turns on by being input to the transistor (Q ₁₎ via a resistor (R _9). Since the transistor Q ₂ is turned off by the turn-on operation of the transistor Q ₂ , the power supplied to the constant voltage circuit VA through the switches PT ₁ and PT ₂ is stopped.

Therefore, since the power supply Vc applied through the output terminal OUT of the constant voltage circuit VA is cut off, the time controllers A ₁ and A ₂ maintain the non-operating state, and all the functions of the heater control circuit are stopped. will be.

Afterwards, when the user quenches the switch SW ₁ to restart the heater control circuit, the rated voltage (high level power supply) of the zener diode ZD ₁ passes through the contact point SWb ₁ to the logic controller A ₃ . Is inputted to start the motor drive A ₄ . By the operation of the motor drive A ₄ , the safety control unit A ₁₆ repeats the above operation while detecting the starting power supply VD supplied to the motor driving unit A ₁₂ .

As described above, in the present invention, in controlling the hot air fan, the temperature of the heated air is detected from time to time to prevent the cold air from being supplied at an over temperature state and at a low temperature, as well as the overload state that is frequently generated in the drive motor. By preventing burnout, there is an advantage in improving the temperature control and the reliability of the heater.

Claims (3)

A time control unit A ₁ for controlling the fuel supply motor driver A ₁₂ , a convection blower driver A ₁₃ , a time control unit for controlling the startup time of the latent heat blowing mechanism driver A ₁₄ and the combustion air blower driver A ₁₅ . A ₂ is connected to the motor drive A ₄ through the logic controller A ₃ , and the time controllers A ₁ and A ₂ detect the starting state of the fuel supply motor driver A ₁₂ to detect the starting state. _{In a} typical warmer fan control circuit configured by connecting a signal detecting unit A ₅ which gives an initial condition so that ₁ and A ₂ can be restarted for a set time, a counter unit A connected to the time control unit A _{2 is} provided. ₆ ), (A ₇ ) includes a convection blower drive (A ₉ ), a combustion blower drive (A ₁₁ ), and a latent heat blower drive (A ₁₀ ) to provide a convection blower drive unit (A ₁₃ ) and a latent heat blower drive unit (A ₁₄ ). Combustion blower drive (A ₁₅ ) is connected to each other and convection blower drive (A ₉₎ ) And the combustion blower drive (A ₁₁ ) is connected to the time control unit (A ₁ ) at the same time is connected to a temperature sensing unit (A ₈ ) for controlling the temperature and prevention of cold air in the room, and also of the fuel supply motor drive unit (A ₁₂ ) Safety control device for a hot air blower, characterized in that the logic control unit (A ₃ ) is connected to the safety control unit (A ₅ ) for detecting the over-voltage state of the heat sink installed in the starting voltage or the heat blower to initialize all conditions. The temperature sensing unit (A ₈ ) and the convection blower drive (A ₉ ), the temperature switch for preventing the warm air to prevent the discharge of air heated above the maximum set temperature or air lowered below the minimum set temperature. (SW ₄ ) and the cold air temperature control switch (SW ₃ ), the safety controller of the warm air, characterized in that each connected. The safety control unit (A ₁₆ ) is connected to the non-inverting terminal (+) by connecting a resistor (R ₁ ) and a diode (D ₁ ) in series, but the capacitor (C ₁ ) and the resistor (R ₂ ) are in parallel. Connect the connected delay circuit and connect the distribution resistors (R ₃ , R ₄ ) to the inverting terminal (-) to integrate the signal output from the resistor (R ₇ ) and the capacitor (C ₄ ), and then the OR gate (OR ₁ ). The other end of the OR gate OR ₁ is connected to the output terminal OUT of the constant voltage circuit A ₁ in parallel with the light emitting diode LED ₁ and the resistors R ₅ , R ₆ and a capacitor. (C ₂ ) is connected through the inverter (I ₁ ), and the input terminal of the constant voltage circuit (A ₁ ) is attached to the inner plate (4) or the heat sink plate (5) of the warm air fan to sense the actual temperature and abnormal temperature The on-over switch PT ₁ and the heat sink switch PT ₂ which are turned off are connected in series to one end of the transistor Q ₂ , and a capacitor ( C ₇ ) are connected in parallel, and the output terminal of the OR gate OR ₁ is connected to one end of the AND gate AND ₁ through a capacitor C ₅ connected in parallel, and the other end thereof is the resistor R ₈ and the capacitor C _6. ) jidoe is connected between one end of the resistor (R ₈₎ is connected in common to the base of the transistor (Q ₁₎ is connected through the output stage and the resistor (R ₉₎ of the aND gate (aND ₁₎ of the transistor (Q ₁₎ The collector is connected to the base of transistor Q ₂ with feedback resistor R ₁₀ connected to the base, and the collector of transistor Q ₂ has resistors R ₁₁ , R ₁₂ , zener diode ZD ₁ , and capacitor C. ₆ ) by connecting them in parallel to _one contact point SW ₁ a and SW ₁ b of the switch SW ₁ , and the other end of the contact point SW ₁ b to the logic controller A ₃ , and the contact point SW ₁ a. ) sikimyeo other end is connected to the aND gate (aND ₁₎ of, in the output stage of the aND gate (aND _1), the inverter (I ₂₎ and the photodiode ₍₁ OPD) and a resistor (R ₁₃₎ and a diode Series connection to (D ₂₎ to the supply voltage (Vc), and has the collector of the phototransistor (OPQ ₁₎ resistors (R _14, R ₁₅₎ and a Zener diode (ZD ₂₎ and a transistor (Q ₃₎ and a triac (T) Safety control device of a hot air blower, characterized in that configured by connecting the alarm (BZ) and the warning light (PL) for generating a warning sound and a warning light when an error occurs.