KR940001421Y1 - Safety device for burner - Google Patents

Abstract

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Description

Combustion state detection circuit

1 is a general block diagram of a combustor.

2 is a specific circuit diagram of an embodiment of the present invention.

Figure 3 is a waveform diagram of each input and output terminal of the microprocessor for explaining the present invention.

4 is a flowchart of a microprocessor for explaining the present invention.

* Explanation of symbols for main parts of the drawings

4: temperature sensing unit 5: microprocessor

8: Malfunction prevention part 9: Reset alarm part

601: heater driving unit R ₈ -R ₁₅ : resistance

C ₂ , C ₃ : Capacitor D ₁ , D ₂ : Diode

Q ₃ -Q ₅ : Transistor RY ₁ : Relay

The present invention relates to an abnormal state detection circuit of the combustor, in particular, disconnection of the temperature sensing element, disconnection of the preheating heater, abnormal overheating of the burner, and the holding of the microprocessor to sense the fact that the combustor is blocked and simultaneously It is related to the abnormal state detection circuit that caused the alarm.

In the past, when the preheater was disconnected, the burner could be disconnected only when the burner was not preheated or burned, and when the burner was overheated, the burner could be checked only by the operation of the thermostat. there was.

In other words, it was possible to check the disconnection of the preheating heater only through visual or tactile sense, and to detect the abnormal overheating of the burner only when the thermostat was activated. No alarm was provided.

Therefore, the present invention compares the operating time and the temperature detected by the burner temperature sensing element in the normal state in which the preheater is operated to determine whether the preheater is operating normally or abnormally. It is designed to detect disconnection, burner temperature detection element, and to prevent burner damage due to overheating by intervening the operation of the combustor when the burner is abnormally overheated. Since holding may be induced, the abnormal operation of the preheating heater is suppressed as much as possible by blocking the relay operation for energizing the preheating heater during the holding of the microprocessor, which will be described in detail with reference to the accompanying drawings.

1 is a general block diagram of a combustor, a key input unit 1 for selecting various keys, an electrostatic source unit 2 for converting an AC power source into a DC power source, a flame detector unit 3 for detecting a flame, and a temperature of a room temperature and a burner The preheating heater receives the control signal from the microprocessor 5 and the microprocessor 5 that compares the temperature sensing unit 4 and the data applied from each unit with the set data and sends control signals accordingly. , A load driving unit 6 for driving the ignition device, the electronic pump, the blow motor and the fan motor, and a display unit 7 for receiving the control signal from the microprocessor 5 and displaying the contents thereof.

2 is a detailed circuit diagram of the present invention, in which the reference voltage input unit 201 and the resistors R ₆ -R including resistors R ₁ -R ₅ , capacitors C ₄ , and transistors Q ₁ , Q ₂ are illustrated. ₇ ), a temperature sensing unit (4) consisting of a noise preventing capacitor (C ₁ ), a room temperature sensing element (TH) and a burner temperature sensing element (HTH), a resistor (R _8- R ₁₂ ), and a capacitor (C ₂ , C _3). ), Diodes (D ₁ , D ₂ ) and transistors (Q ₃ , Q ₄ ) to prevent malfunction 8 and resistors (R ₁₃ -R ₁₆ ), transistors (Q ₅ ) and preheating heater driving relay (RY). ₁ ) The reset alarm unit 9 consisting of the heater driving unit 601 and the resistors R ₁₆ and R ₁₇ alarm device BZ and the light emitting element D ₃ and the data applied from the respective parts, Comparing with the microprocessor (5) for transmitting the control signal accordingly.

4 is a flowchart for explaining the present invention as described above, when the operation key of the key input unit 1 is turned on, the output terminal P ₅ of the microprocessor ₅ becomes a high level potential and the heater driving unit 601. The transistor Q ₅ is turned on and the relay Ry ₁ is operated to allow the AC power to be applied to the preheater, thereby preheating the burner. At this time, the burner temperature sensing element HTH of the temperature sensing unit 4 is applied. When the potential applied to the input terminal P ₂ of the microprocessor 5 is not lowered below the a potential as in FIG. 3B, so that the set time T ₁ elapses, that is, the temperature of the burner When the temperature is not higher than x ° C., the microprocessor 5 determines that the burner temperature sensing element HTH of the temperature sensing unit 4 is disconnected, performs a reset operation, and simultaneously resets the output terminal P ₆ to the output terminal P ₆ . Pulse signal as in (e) of 3 degrees Output to thereby operate the light-emitting element (D ₃₎ and the alarm (BZ) of the reset alarm unit (9).

If the potential applied to the input terminal P ₂ of the microprocessor 5 is not lowered below the set potential a so that the set time T ₁ elapses, the burner temperature sensing element HTH is disconnected. The reason for the determination is that if the burner temperature sensing element HTH is in a normal state, even a small potential will be applied to the input terminal P ₂ .

On the other hand, the potential applied to the input terminal P ₂ of the microprocessor 5 by the burner temperature sensing element HTH of the temperature sensing unit 4 has exceeded a potential as shown in (b) of FIG. If the temperature does not fall below the b potential within the set time T ₂ , that is, if the temperature of the burner does not rise above the set temperature (y ° C.), the microprocessor 5 determines that the preheating heater is disconnected. The potential applied to the input terminal P ₂ of the microprocessor 5

This is because the resistance of the burner temperature sensing element HTH is high.

Therefore, the microprocessor 5 performs a reset operation and simultaneously transmits a pulse signal to the output terminal P ₆ to operate the light emitting device D ₃ and the alarm device BZ of the reset alarm unit 9.

On the other hand, when the temperature of the burner reaches the appropriate temperature (Z ℃ ≤ temperature ≤ y ℃), the normal combustion stroke is performed, but when the set temperature (Z ℃) is exceeded, the microprocessor 5 determines that it is overheated and resets it. Simultaneously with the operation, a pulse signal is sent to the output terminal P ₆ to operate the reset alarm unit 9 to prevent damage to the burner.

In FIG. 2, the malfunction preventing part 8 blocks the operation of the heater driving part 601 when the microprocessor 5 is held by external noise or the like. As shown in Fig. 1A, the high-level potential transmitted from the output terminal P ₄ of the microprocessor 5 includes the resistor R ₆ , the capacitor C ₂ , and the diode D ₂ of the malfunction prevention part 8. After charging in another capacitor (C ₃ ) through), when the output terminal (P ₄ ) becomes a low level potential, the capacitor (C ₃ ) is discharged through the resistors (R ₉ , R ₁₀ ) While Q ₃ and another transistor Q ₄ are turned on, the Vcc power source operates the preheating heater driving relay Ry ₁ through the resistor R ₁₅ and the transistor Q ₅ of the heater driver 601. The microprocessor 5 enters the holding state by noise or the like from the outside and exits. Terminals (P ₄₎ has a potential as to the turn-off state transistor (Q ₃₎ has a fixed high or low level ground malfunction prevention section 8 is cut off the operation of the heater driving unit (601).

In this way, the present invention detects the disconnection of the temperature sensing element (HTH), the disconnection of the preheating heater, the abnormal overheating of the burner, and the holding state of the microprocessor (5), which blocks the operation of the combustor and simultaneously alarms the fact. By doing so, there are advantages such as reliability of the product.

Claims (3)

In the combustor using a microprocessor, the temperature sensing unit (4) for detecting the room temperature and the temperature of the burner 롸 compares the data applied from each unit with the set data and sends out a control signal accordingly, but the temperature sensing unit ( 4) is the temperature sense signal (T _1, the set time being from T ₂₎ If below the set point (x ℃, y ℃) within determines that the burner temperature-sensing device is disconnected or the preheater is disconnected, and the top When exceeding another set temperature (Z ° C) during combustion, the microprocessor 5 which determines that it is an abnormal overheat and performs the reset operation, and the heater driver 601 for driving the preheater by receiving control signals from the microprocessor 5. ) And the microcontroller 5 to prevent the operation of the heater driving unit 601 when the microprocessor 5 is held by the noise of the external rotor and the microprocessor. An abnormal state detection circuit of a combustor, characterized in that it comprises a reset alarm unit (9) for generating an alarm signal upon reset of the processor (5). The method of claim 1, wherein the malfunction prevention part 8 is composed of resistors (R _8- R ₁₂ ), capacitors (C ₂ , C ₃ ) diodes (D ₁ , D ₂ ) and transistors (Q ₃ , Q ₄ ). An abnormal state detection circuit of a combustor. 2. The abnormal state detection circuit of a combustor according to claim 1, wherein the heater driving unit (601) is composed of a resistor (R ₁₃ -R ₁₅ ), a transistor (Q ₅ ), and a preheating heater driving relay (Ry ₁ ).