KR0133952Y1 - Gas boiler equipped with proportional control based on air - Google Patents

Abstract

The present invention relates to a proportional control of the gas valve and fan motor at the same time according to the water temperature not only can maintain the desired water temperature, but also to control the gas volume and air volume at the same time to maintain the most optimal combustion state, The one-chip microcomputer 2 receives the digital clock for RPM, which is the rotational speed of the DC fan motor 3, by the count stage C, and the heating water temperature to the input terminals a1-a3 where the input analog signal is converted into a digital signal. The circuit (7), the hot water supply temperature circuit (8), and the flame detection circuit (9) are connected, and after performing all calculations for proportional control to the output terminals (d1, d2) that output digital signals as analog signals, control the DC motor. An air proportional control gas boiler characterized in that a DC fan motor (3) and a gas valve (4) which are simultaneously controlled in proportion to the voltage through the circuit (10) and the gas valve control circuit (6) are installed.

Description

Air proportional control gas boiler

1 is a schematic diagram showing an air proportional control gas boiler according to an embodiment of the present invention.

2 is a block diagram showing the internal register of the one-chip microcomputer shown in FIG.

3 is a flowchart for explaining the operation of the air proportional control gas boiler of the present invention.

* Explanation of symbols for main parts of the drawings

1: room temperature controller 2: microcomputer

3: DC fan motor 4: Gas valve

5: control unit 6: gas valve control circuit

7: heating water temperature circuit 8: hot water supply temperature circuit

9: flame detection circuit 10: DC motor control circuit

[Technology Background]

The present invention relates to a proportional control of the gas valve and fan motor at the same time according to the water temperature not only can maintain the desired water temperature, but also to control the gas volume and air volume at the same time to maintain the most optimal combustion state gas boiler.

[Prior art]

Currently, boilers used for heating purposes have been developed and used in various ways according to the required water and installation purposes as oil and gas boilers and electric boilers depending on the fuel supplied.

The domestic gas boiler is supplied with gas that passes through the gas supply pipe to be ignited through the main burner and the pilot burner by the ignition transformer, and a hot water supply heat exchanger is installed, and a rooftop roof or hot water circulation pump is installed through the water supply and heating pipe. have.

The general proportional control boiler of the gas boiler is capable of heating and using hot water at a uniform temperature within a non-adjustable range, less thermal stress on the main heat exchanger due to temperature deviation, and low noise.

In addition, the heating and hot water outlet temperature characteristics are precisely controlled within ± 2 ℃, so it can be used in a comfortable state when using hot water, and the probability of initial ignition noise is lowered by maintaining uniform exhaust resistance.

In the conventional boiler control method having the above characteristics, the on / off control method compares the set temperature with the measured temperature to turn the boiler on / off, but it is difficult to maintain an appropriate water temperature in this method.

That is, when the fan is turned on and the fan is turned on, it is delayed during the prepurge time and then the igniter is turned on and the gas valve is turned on and ignited (ignition). Then, when the igniter is turned off and the set temperature is lower than the measured temperature, the gas valve is turned on and measured. If the temperature is less than the start / stop temperature range subtracted from the set temperature, the operation of turning on the igniter and turning on the gas valve is repeated.

Therefore, since the conventional proportional control gas boiler only controls the gas valve in the igniter off state after ignition, there is a drawback in that the combustion state is not good because the gas amount and the air amount do not match.

[Purpose of designation]

The present invention devised to solve the disadvantages of the conventional on / off control method as described above, unlike the conventional one by using a one-chip microcomputer to achieve the desired temperature at the fastest speed by proportional control after ignition (ignition) As the temperature is continuously maintained as proportional, derivative, and integral control, the gas valve and fan motor are proportionally controlled at the same time according to the water temperature, so that not only the desired water temperature can be maintained but also the gas and air volume can be simultaneously controlled to maintain the most optimal combustion state. The purpose is to provide an air proportional control gas boiler.

[Composition of design]

In the air proportional control gas boiler of the present invention for achieving the above object, the one-chip microcomputer 2 receives a digital clock for RPM which is the rotational speed of the DC fan motor 3 at the count stage C, and inputs an analog signal. Is connected to the heating water temperature circuit (7), the hot water supply temperature circuit (8) and the flame detection circuit (9) to an input terminal (a1-a3) that is converted into a digital signal, and outputs the digital signal as an analog signal (d1). d2), all the calculations for the Vile control are installed, and then the DC fan motor 3 and the gas valve 4 which are simultaneously controlled in proportion to the voltage through the DC motor control circuit 10 and the gas valve control circuit 6 are installed. It is characterized by.

EXAMPLE

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a system diagram showing an air proportional control gas boiler according to an embodiment of the present invention. The air proportional control gas boiler according to the present invention omits contents other than proportional control, that is, the overall of the gas boiler and omits only proportional control. Display and explain.

The one-chip microcomputer (2) that controls and controls the operation of the gas boiler is installed with an indoor temperature controller (1) in contact with a main controller (not shown) to perform the program by state so that the indoor temperature is maintained at a constant temperature for setting the gas boiler. Done.

The parts necessary for the proportional control are respectively connected to the input / output terminals of the one-chip microcomputer 2, and the count stage C is a digital clock (eg, 3 revolutions per revolution) of the RPM which is the rotational speed of the DC fan motor 3. Clock) to read the number of clocks per second from the one-chip microcomputer 2 to recognize the RPM of the DC fan motor (3).

In addition, the input stages (a1-a3) in which an analog signal is inputted and converted into digital signals are respectively connected to a heating water temperature circuit (7), a hot water supply temperature circuit (8), and a flame detection circuit (9) to convert the input value into a temperature. Used for conversion and conversion of the state of the flame, the other port output stage (b) is provided with a control section 5 for ignition control, pump control and other control.

The output stages d1 and d2, which are converted into analog signals and transmitted as analog signals, perform all calculations for proportional control by totally proportioning the input data in the one-chip microcomputer 2 (see FIG. 3). When the voltage is outputted, the DC motor motor 3 and the gas valve 4 are controlled by the DC motor control circuit 10 and the gas valve control circuit 6 based on the voltage.

Therefore, the air proportional control gas boiler according to the present invention uses the one-chip microcomputer 2 to simultaneously control the gas valve 4 and the DC fan motor 3 according to the water temperature. By controlling the air volume at the same time, it is possible to maintain the most optimal combustion state.

FIG. 2 is a block diagram showing the internal register of the one-chip microcomputer shown in FIG. 1. In the one-chip microcomputer 2, which is a central processing unit, registers R1 and R2 for storing values of set and measured temperatures; Register (R3) that stores the value of the calculated temperature (set-to-measured temperature), registers (Rp, Rd, Ri) that store the calculated values of proportional control, derivative control and integral control, and the total calculated control value It consists of a register (R4).

The operation of the air proportional control gas boiler by the one-chip microcomputer 2 configured as described above will be described based on the flowchart shown in FIG. 3.

When the fan is turned on as in the prior art, the prepurge time is delayed and then the igniter (not shown) is turned on and the gas valve 4 is turned on and ignited (ignited). The one-chip microcomputer 2, which has received the illustrated temperature and the voltage output from the flame detection circuit 7-9, stores the values of the set temperature and the measured temperature in the registers R1 and R2, which are internal storage locations. Then, the other register (R3) stores the value of the calculated temperature (set temperature-measured temperature), if the temperature value calculated in the register (R3) is greater than 10 to move to the routine of the unit time delay If the temperature value calculated in the register R3 is less than 10, the control operation starts from then on.

The temperature value calculated in the register R3 is compared with 10 to operate at the maximum capacity of the burner (not shown) to reach the desired temperature at the fastest speed, that is, the set temperature-10, and then proportionally control. Integrate the differential control and the integral control to calculate and maintain the set temperature through control after calculation.

That is, the register Rp is a proportional control coefficient storage device and stores the proportional control calculation value—the proportional constant × the calculated temperature value R3, and the register Rd is the derivative control coefficient storage device and the derivative control derivative value. Stores the coefficient x (calculated temperature value R3-previous data R3 'of R3). The register Ri is an integral control coefficient storage device and is an integral control coefficient value-integral coefficient x (R3' + ( Stores R3 + R3 ') / 2) + Vrpm, and Vrpm represents the number of revolutions of the DC fan motor 3. Therefore, the final register R4 is a register Rp + register Rd + register Ri. The total calculated control value of) is stored.

Finally, the one-chip microcomputer 2 outputs the value of the resistor R4 through the DC motor and the gas valve control 10 and 6 to simultaneously control the gas valve 4 of the DC fan motor 3, and the unit time. It moves to the routine of delay, performs the function of proportional control, and then moves to the initial stage of non-control control.

[Effect of design]

As described above, according to the present invention, unlike the conventional on / off control method, after the ignition (ignition) using a one-chip microcomputer, the proportional control is achieved to reach the desired temperature at the fastest speed, and the temperature is controlled by the proportional, derivative, and integral control. As it maintains and maintains the gas valve and fan motor at the same time according to the water temperature, it is possible not only to maintain the desired water temperature but also to provide the air proportional control gas boiler which can maintain the most optimal combustion state by controlling the gas volume and air volume simultaneously. have.

Claims (3)

The one-chip microcomputer 2 receives a digital clock for RPM which is the rotational speed of the fan motor 3 at the count stage C, and a heating water temperature circuit to the input terminal al-a3 where the input analog signal is changed into a digital signal. (7), the hot water supply temperature circuit (8) and the flame detection circuit (9) are connected, and the DC motor control circuit after all calculations for proportional control to the output terminals (d1, d2) for transmitting digital signals as analog signals A proportional control gas boiler characterized in that a DC fan motor (3) and a gas valve (4) which are simultaneously controlled in proportion to the voltage through the (10) and the gas valve control circuit (6) are installed. The method of claim 1, wherein the one-chip microcomputer 2 compares the temperature value calculated in the internal register R3 with 10 to operate at the maximum capacity of the burner to reach the desired temperature at the fastest speed. Air proportional control gas boiler. The method of claim 2, wherein when the temperature value calculated by the resistor (R3) is less than 10, the value of the resistor (R4) is output through the DC motor and gas valve control (10, 6) and the DC fan motor (3) and An air proportional control gas boiler characterized by simultaneously controlling the gas valve (4).