KR940003237Y1 - Temperature controller of gas boiler - Google Patents

Abstract

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Description

Heating temperature control circuit for gas boiler

1 is an overall block diagram of the present invention.

2 is a main circuit diagram of the present invention.

Figure 3a, b is a graph showing the degree of burner replacement time according to the heating temperature and time by the circuit of the present invention.

* Explanation of symbols for main parts of the drawings

1,2,3: OP amplifier 4: Buffer

5,6,7,8 Comparator 9: Delay IC

10: Timer A: Detect heating water temperature and set temperature

B: Large, medium and small burner switching circuit part C. Burner reactivation pause circuit part

D: Large, medium and small burner operation time delay circuit

N ₁ , N ₂ : NAND gate th: Thermostat

Tr ₁ , Tr ₂ , Tr ₃ , Tr ₄ , Tr ₅ , Tr ₆ , Tr ₇ , Tr ₈ , Tr ₉ , Tr ₁₀ , Tr ₁₁ : Transistor

The present invention is mainly for heating water by heating water by using gas as a fuel, and when hot water is tapped out from the main body of the machine to reach the temperature set by the user within a short time, and at the same time the proper heating state after approaching the set temperature. It automatically reduces the consumption of gas for the first time, and minimizes the number of times the burner is turned "on" or "off" to prevent crowding of the equipment and maintains the optimum temperature for consumers to keep the indoor environment at a low cost. The present invention relates to a heating temperature control circuit for a gas boiler designed to be maintained.

Most of the gas boilers currently used have a large and small capacity of the burner in which gas is burned by adjusting the output temperature of hot water so that the burner of a large use is operated first for heating according to the set temperature, and the temperature of the hot water. By stopping the burner of the burner when the temperature increases according to the intermittent operation of the bimetallic temperature sensor that measures the temperature, the gas is burned in the soburner, and when the temperature decreases again, the combustion is transferred to the burner. Hot water is heated to the temperature set according to your preference.

However, such a conventional gas boiler has a more complicated configuration of a circuit for operating the same temperature control stage, and there is a slight temperature difference depending on the sensing temperature of the temperature sensor up to the set temperature or to maintain the set temperature. Even if the burner is changed immediately, the temperature of the water is increased, and when the set temperature is reached, the burner is turned off immediately after repeated repeated operations.

The present invention is designed to quickly heat up to the set temperature in order to solve such a conventional problem, and the burner operates at a suitable time at all times in consideration of the latent heat of the heating water and the temperature deviation that the body does not feel the cold change at the proper temperature. As described in detail by the accompanying drawings as designed as follows.

Power is supplied from the outside of the gas boiler body, which also functions as a water heater, to supply a cold water to the inside, a ignition flame generator, a motor for driving a three-way valve, and a solenoid valve. When a signal is applied by the driving control circuit, it is driven by the contact of the relay formed separately.

In this unit used to heat water with gas as a fuel, the burner having the purpose of heating water is driven separately according to the heat dissipation level of large, medium and small, so that the water passing through the heat exchanger is appropriate. The solenoid valves intervene to burn the burner of the capacity required for the temperature.

As shown in the block diagram shown in FIG. 1, when the burner is combusted, the fan motor and the water pump are blown by the respective driving circuits at a constant speed, and the operating time is controlled by a safety timer. B. An abnormal signal generating circuit is provided to inform the driver when an abnormality occurs, and the user can select it to prevent unnecessary heating operation during the summer when no heating is required and during the winter when hot water and heating are needed. The winter selection circuit is connected.

Then, the external high voltage power is pressurized by the transformer to a voltage suitable for the circuit configuration and converted into direct current, and when the gas is supplied, a spark ignition circuit for igniting it and a flame detection circuit for detecting it are connected to the heating set by the user. A gas electronic valve driving circuit for opening / closing large, medium, and small burners is provided as a whole to heat hot water as an appropriate temperature necessary for temperature and tapping. The present invention describes the circuit for controlling the heating temperature in more detail. Is as follows.

Resistor (R ₁ to R ₂₀ ), Capacitor (C _{1 to} C ₃ ), Diode (D ₁ ), Zener Diode (ZD ₁ ), Variable Resistor (VR ₁ , VR ₂ ), OP Amplifier (1 to 3), Burner (4) a heating water temperature detection and setting temperature unit, comprising: (4) and a thermostat (th) for comparing the detected temperature of heating water with a predetermined set temperature and outputting a predetermined voltage according thereto; Resistor R ₂₁ to R ₄₃ , transistors Tr ₁ to Tr ₈ , capacitors C ₄ to C ₇ , and comparators 5 to 8, wherein the heating water temperature is detected and A large, medium and small burner switching circuit section ( _b ) for selectively driving the relays Ly ₁ (Ly ₂ ) for driving the large, medium and small burners according to the output voltage; Diode (D ₂ ), resistors (R ₄₄ to R ₄₆ ), capacitors (C ₆ to C ₁₁ ), NAND gates (N ₁ , N ₂ ), transistor (Tr ₉ ), and timer (10). A burner reactivation pause circuit portion (C) which pauses the interlocking operation in the medium and small burner switching circuit portions (B) and directs the burner to be switched to a set temperature at a low temperature; Resistor (R ₄₇ ), condenser (C ₁₂ ~ C ₁₅ ), transistor (Tr ₁₀ , Tr ₁₁ ) and relay IC (9), and the delay rate that the large, medium and small burners are frequently switched according to the set temperature It is designed by interconnecting large, medium and small burner operation time delay circuits.

Referring to Figures 2 and 3a, b of the effect of the present invention configured as described above is as follows.

First, in the thermoth (th) installed to measure the temperature of the heated hot water, the temperature of the heating water is detected and input to the "+" stage of the OP amplifier 1.

At this time, the reference voltage according to the set temperature input to the "-" terminal of the OP amplifier 1 is applied a predetermined voltage in accordance with the operating value of the variable resistor (VR ₁ ), so the OP amplifier 1 Compared and mixed, it is input to the highest output sensitive circuit composed of two OP amplifiers (2) (3).

Further, the output of the input to the maximum output-sensitive circuit the OP amplifier 1 is makin is a substantial temperature responsive characteristics determined by the amount of charge of the capacitor (C _3), wherein the capacitor (C ₃₎ is output soft signals the temperature sensitive It plays a role of changing state.

Then, the predetermined signal output from the peak output circuit (Peak hold circuit) is input to the "+" end of the buffer 4, and the predetermined signal output from the heating water temperature detection and setting circuit section is output in a stable state. And then applied to the '+' terminals of the comparators 5, 6, 7, and 8, respectively, wherein the magnitude of the reference voltage applied to each of the '-' terminals is equal to the comparator (5)> comparator (6). )> Comparators (7)> Comparators (8)

At this time, the comparators 5, 6, 7 and 8 perform an operation of comparing the predetermined reference voltage applied to the "-" stage and the output voltage of the buffer 4 with each other. When the output voltage of the buffer 4, which is a mixed value of the sensed temperatures, is greater than the reference voltage applied to the '-' terminals of the respective comparators 5, 6, 7, and 8, each output is 'high'. Becomes

For example, when the output of the buffer 4 becomes larger than the reference voltage applied to the '-' terminal of the comparator 5, the output of the comparator 5 becomes 'high', so that the trigger terminal of the delay IC 7 ( T ₁ ) is input 'high' signal, and reset terminal (R ₁ ) is 'low' because the digital transistor (Tr ₁ ) is 'ON' by the signal which is the result of sensing temperature and setting temperature result from output sensing circuit. 'Signal' is input and eventually 'low' signal is output from the output terminal O ₁ of the delay IC 9, and 'high' is output from the collector of the digital transistor Tr ₂ to output the large burner ignition relay Ly ₁ . Is driven to cause combustion by the large burner.

In addition, the signal transistor (Tr ₃₎ to the base of the "high" because the signal applied to a transistor (Tr ₃₎ is there is the "on", wherein the output of the comparator (6) is a "high" state to "High" Since the output of the transistor Tr ₅ held is muted by the transistor Tr ₃ to make the state low, the heavy burner driving relay Ly ₂ is turned off, and the heavy burner burns in duplicate when the large burner is driven. Can be prevented.

On the other hand, since the 'low' signal is being output from the output terminal O ₁ of the delay IC 9 in which the 'high' signal is input to the trigger terminal T ₁ (Tr ₁₀ ), the signal is " low " The signal is input and the state in which the 'high' signal is output from the collector is maintained, and the output of the transistor Tr ₅ is maintained in the 'low' state by the transistor Tr ₃ so that the output terminal of the transistor Tr ₂ is " High "state, and since the output of the comparator 7 also maintains a high state, the output of the transistor Tr ₇ also maintains a high state. The blower fan continues to run for a while.

In addition, when the heating amount is lower than the burning amount of the large burner to maintain the proper temperature, that is, when the user is raised to a temperature higher than the desired setting temperature, or when the first operation, the operation of the large burner that is operated for rapid hot water heating In order to stop and maintain the proper temperature, the output of the OP amplifiers 1, 2, 3 causes the buffer 4 to stop as a result of the temperature sensing by the thermoth (th) and the value of the set variable resistance (VR ₂ ). When output through the comparator 5, the value is larger than the reference voltage of the '+' stage at the '-' stage, and the value less than the reference voltage of the '+' stage at the '-' input terminal of the comparator 6 (7). Since a "low" signal is output only at the output terminal of the comparator 5 and the output of the digital transistor Tr ₁ becomes "high", the "low" signal is applied to the trigger terminal T ₁ of the delay IC 9. Input and its output becomes "high" so that the output of the comparator 8 changes from "high" to "low" Until the 'high' signal is inputted to the reset terminal R ₂ of the delay IC 9, the combustion operation of the large burner in which the output signal of the transistor Tr ₂ remains "low" is continued.

Thereafter, the temperature of the heating water rises after a predetermined time, so that the output of the buffer 4 is less than the reference voltage of the comparator 5, and is less than the reference voltage applied to the '_' terminal of the comparator 6 (7). If it becomes large, the output of the comparator 6 becomes "high" and the signal applied to the other trigger terminal T ₂ of the delay IC 9 becomes "high" and "high" at the base of the transistor Tr ₄ . Since the signal is applied, the transistor Tr ₄ is 'on' and the transistor Tr ₅ is 'off', so that a "high" signal is output from the collector of the transistor Tr ₅ .

In addition, since a "low" signal is output from the output terminal O ₂ of the delay IC 9 to the base of the transistor Tr ₁ , the output of the transistor Tr ₅ is maintained to be induced to a "high" state. Since the high burner signal, which is an operation signal, is sent to the middle burner driving circuit unit and the blowing fan driving circuit unit, the relay Ly ₂ is driven to maintain combustion by the heavy burner.

When the thermostat (th) detects a state in which the set temperature can be maintained even by combustion heating with only the small burner, the output voltage of the buffer 4 is applied to the "-" end of the comparator 5 (6). It becomes smaller than the reference voltage and becomes larger than the reference voltage applied to the '-' terminal of the comparator 7 so that the output of the comparator 6 becomes "low" so that the "low" signal is applied to the trigger T ₂ of the delay IC 9. Since it is applied to the base of the transistor Tr ₄ at the same time, the transistor Tr ₄ is turned off and the transistor Tr ₅ is turned on, so that the output of the transistor Tr ₅ becomes “low”.

At this time, the driving of the heavy burner is delayed because a "low" signal is output from the transistor Tr ₅ by the 'high' signal output from the delay IC 9 output terminal O ₂ at the base of the transistor Tr ₁ . However, the "high" signal, which is the output of the comparator 7, is input to the trigger terminal T of the timer 10 and is simultaneously applied as a "high" signal to the base of the transistor Tr ₆ to maintain the 'on' state. Since the transistor Tr ₇ is 'off', a "high" signal is outputted from the collector thereof, and only the blower fan and the sober burner are driven by the 'high' signal output from the transistor Tr ₉ collector, thereby Heating state is maintained.

That is, the temperature of the heating is not less than a predetermined temperature when the conditions are heating the combustion only small burners, the transistor so "low" signal is output from the collector of the (TR _2, TR _5), for, relay of the burner (Ly ₁ , Ly ₂ ) is 'off' and the 'high' signal is output from the collector of the transistor TR ₇ so that only the blower fan and the small burner driver are driven to maintain the heating operation by the small burner.

The large, medium and small burner switching circuits (B) and the hot water are heated to transfer the large burner, the heavy burner, and the small burner which exhibit the corresponding heat amount for the proper tapping temperature according to the set temperature by the above operation. It is delayed by large, medium and small burner operation delay circuit (D) that burner is replaced at any time according to the set temperature.

If too frequent changeovers occur in the equipment, it may cause shortening of the service life or failure. Also, the temperature sensing temperature (th) is different from the actual temperature of the hot water circulated to the surrounding hot water and heating. In addition, since the latent heat that can make the room lighter for a certain period of time in the hot water, there is a temperature rise or a temperature drop deviation that the user in the room cannot feel, so the burner is switched to be sensitive to the set temperature immediately. Burner reactivation stop circuit (C) is required.

Therefore, in the burner reactivation stop arc (C), the temperature detection according to the set temperature and the output voltage of the setting circuit (A) and the predetermined reference voltage applied to the "-" end of the comparators (5) (6) and (7) In comparison, when the reference voltage applied to the "-" terminal of each comparator is large, the output of the comparator 7 becomes "low" so that a "high" signal is applied to the trigger terminal T of the timer 10. At the output terminal of the timer 10, the output of the transistor Tr ₇ is kept low for a time constant by the resistor R ₄₆ and the capacitor C ₁₁ so that the output of the transistor Tr ₇ becomes low. Burner operation is cut off.

Then, when a predetermined time passes and the temperature of the heating water falls below the set value, the output of the buffer 4 is increased again, so that it becomes larger than the reference voltage applied to the "-" end of the comparators 5, 6, and 7. When the high signal is output from the collector of the transistor Tr ₂ , but the blower fan does not receive the driving signal, the circuit is controlled so that the circuit cannot be driven until the high signal is output from the transistor Tr ₇ . Can be.

In addition, the comparator 8 has a reference voltage applied to the "-" end of the voltage set value greater than the reference voltage applied to the "-" of the comparators 5, 6, 7, which is the output after the buffer (4) Even if this becomes small, once the burners are replaced at the small burners and the heavy burners, the replaced burners are maintained until the "high" signal is output from the comparator 8 so as to prevent frequent burner replacements.

In (a), the large burner is operated to the closest 55 ° C at the temperature set by the user (eg, 60 °), thereby rapidly heating.

And from 55 ℃ to 58 ℃, it is replaced by heavy burner and has a relatively gentle rising curve, and it is replaced by soburner because it is almost close to the set temperature between 58 ℃ and 60 ℃. After the soburner is maintained in a suppressed state, when the set temperature reaches 60 ° C, the soburner is also "off", and all burners are not operated by the timer 10 for a predetermined time (about 10-20 minutes). Due to the latent heat of heat, the room can be heated even when the constant combustion heating stops, and the slight stop time is a time constant by the resistance (R ₄₆ ) and the condenser (C ₁₁ ). Just select the time.

In (b), when the heating circuit is re-ignited after stopping the heating circuit for a certain time, the heating water temperature may be largely different from the set temperature in the same state as C, and the small temperature difference in the same state as A and B (about 5 Or less than ℃).

It is common to appear differently depending on the degree of heat resetting of the heating and the degree of cold in the season.

At this time, when the heating water temperature shows the same state as B in the state where the burner can be reactivated after the operation stop time has elapsed by the timer 10, only the burner is turned on. When it reaches the same curve as C, it turns on the dabberna, so that the burner of the proper ability is turned on by excluding sequential transfers of small, medium, and medium by sequential procedures.

The main circuit as described above is installed in the main body so that it is possible to perform "on", "off" and temperature control setting indoors by remote control operation by wireless.

In addition, according to the circuit of the present invention, the signal for driving the large, medium and small burners was controlled by the relay Ly ₁ (Ly ₂ ) to interrupt the electromagnetic valve formed in each burner to allow gas to pass through.

In other words, in the burner re-operation pause circuit section (c), the heating water temperature detection and the set temperature section (a) are determined after a certain time by the characteristics of the timer 10 by the time constant of the capacitor C ₁₁ and the resistor R ₄₆ . ), The large, medium and small burner switching unit (b) and the large, medium and small burner operating time delay circuit unit (D) are operated, and the tapping temperature of the combustion apparatus is set by the consumer. When the temperature is reached, the burner's operation is completely shut off and the state is maintained for a certain time to prevent instant re-ignition.

In general, the gas burner cuts off the operation of the burner when the set temperature is reached, and then the burner reactivation stop circuit part (C) is adopted because the temperature drops rapidly (5 ° to 8 ° C.) after a few seconds after the boiling time. Unless the instrument is repeated many times 'on'-'off' in a short time, the instrument's life and reliability will result in gas fuel inefficiency.

As described above, the present invention allows the large burner to be driven for rapid heating during the first operation by the temperature set by the user, and the middle burner and the small burner of the appropriate capacity are automatically switched to suit the appropriate temperature, and the hot water The heating time that can be moved to its own latent heat prevents the waste of fuel due to the circuit structure that stops the burner operation, and prevents the failure and prolongs the life of the device by the circuit which burner is frequently diverted and prevents continuous replacement. It is a useful design to do.

Claims (3)

A heating water temperature detection and setting temperature unit (A) for outputting a predetermined voltage by comparing the detected temperature of the heating water with a predetermined setting temperature; Large, medium and small burner switching circuit unit for selectively driving the relay Ly ₁ (Ly ₂ ) for driving the large and medium burners according to the heating water temperature detection and the set temperature output voltage ( _A ) )Wow ; A burner reactivation pause circuit section (C) which temporarily stops the linking operation in the large, medium and small burner switching circuit sections (B) and resists the change of the burner sensitively to the set temperature; A heating and temperature control circuit for a gas boiler comprising a large and medium and small burner operation time delay circuit unit (L) configured to interconnect a large, medium and small burner at any time according to a set temperature. The burner reactivation pause circuit unit (C) according to claim 1, further comprising a diode (D ₂ ), a resistor (R ₄₄ -R ₄₆ ), a NAND gate (N ₁ , N ₂ ), a transistor (Tr ₉ ), and a timer ( 10) Heating temperature control circuit for a gas boiler, characterized in that by interconnecting. The large, medium, and small burner operating time delay circuit portion (D) includes a resistor (R ₄₇ ), a capacitor (C ₁₂ to C ₁₅ ), a transistor (Tr ₁₀ , Tr ₁₁ ), and a relay IC (9). Heating temperature control circuit for a gas boiler, characterized in that by interconnecting the.