JP2004317082A - Air proportional control boiler using wind pressure sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air proportional control boiler using a wind pressure sensor. <P>SOLUTION: When the air quantity is decreased in controlling the gas supply quantity in proportion to the quantity of air sucked by the wind pressure sensor for proportionally detecting the air quantity using differential pressure, in order to solve the problem that the gas supply quantity is decreased to reduce the output of the boiler, the rotational frequency of a blower is controlled to keep the air quantity constant when the gas quantity is fixed to enable fixed rated output, whereby the air quantity proportional to the gas quantity can be always supplied to always supply the gas quantity and the air quantity required by the rated output so as to provide the advantage of heightening the combustion efficiency and restraining the discharge of harmful gas to the utmost, thereby preventing environmental contamination. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
【Technical field】
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air proportional control boiler using a wind pressure sensor, and more particularly, to adjusting a gas supply amount in proportion to the amount of air sucked by a wind pressure sensor that uses a differential pressure to detect the amount of air proportionally. In order to solve the problem that the boiler output is reduced by reducing the gas supply amount when the air amount decreases, the air amount is fixed when the gas amount is fixed so that a constant rated output is made. The present invention relates to an air proportional control boiler using a wind pressure sensor that adjusts the number of rotations of a blower so as to maintain a constant output and constantly supplies an air amount proportional to a gas amount so that a rated output of the boiler can be maintained.
[0002]
[Prior art]
Heating and hot water boilers used in ordinary households are roughly classified into oil boilers and gas boilers depending on the fuel used. In recent years, gas boilers that have low air pollution and are convenient for use have been mainly used, and liquefied natural gas (LNG) is used as the fuel.
[0003]
Gas boilers are classified into a condensing type and a non-condensing type by a heat exchanger that heats heating water. Among them, the condensing type gas boiler directly heats the heating water by using the combustion heat and absorbs the latent heat of condensation of the exhaust gas again, thereby maximizing the thermal efficiency.
[0004]
To explain an example of a commonly used condensing gas boiler, a burner is provided at the upper part to ignite and burn down a gas mixed with air, and a high-temperature combustion gas is used at a heating heat exchanger provided at the lower part. The heating operation is performed by heating the fluid (or the heating water) by circulating the fluid and circulating the heated fluid in the room and the living room.
[0005]
During the hot water operation, the three-way valve was operated to shut off the hot water supplied to the room and the living room, switched to the hot water supply heat exchanger provided in parallel, used as a heating source, and shut off and contacted. The hot water for hot water supply is supplied to and returned to the other parts of the hot water supply heat exchanger while being heated, and the warmed hot water is used for washing and bathing.
[0006]
The gas boiler configured as described above is divided into various types according to the control method and the closed state.In particular, the air proportional control method measures the pressure of the air flowing in from the outside, and in proportion to the measured air pressure. In order to supply fuel to the burner, an accurate amount of fuel is supplied in proportion to an incoming air pressure, thereby improving combustion efficiency, minimizing emission of harmful gas and preventing environmental pollution. .
[0007]
That is, since the variable for adjusting the gas amount changes depending only on the air pressure, a constant amount of gas is discharged at a constant air pressure and a constant air ratio without constantly controlling the proportional control portion of the gas valve. Since the value is held, unlike the on / off type or the current proportional control method, the proportional control can be accurately performed.
With respect to such an air proportional control boiler, the applicant has previously filed a Korean patent application (10-1998-44402, Oct. 22, 1998) under the name of "air proportional control condensing boiler" and received registration. I have.
[0008]
FIG. 3 is a configuration diagram showing a general air proportional control condensing boiler, and FIG. 4 is a block diagram showing a configuration of a general air proportional control condensing boiler. First, as shown in FIG. 3, the condensing gas boiler is operated according to an air proportional control method in which the air pressure is adjusted according to the temperature change of the outside air so that a constant amount of air can always be supplied. According to the overall configuration, the closed main body 2 is provided with an intake duct 3 for sucking outside air by the operation of the blower 10 and an exhaust duct 20 for discharging burned exhaust gas to the outside; first and second; A burner 12 for burning a mixture of gas supplied through electromagnetic valves 46 and 46 'and an air proportional control valve 47 and air sucked by the blower 10, a sensible heat section heat exchanger 14 for heating heating water, and a latent heat section A combustor 4 in which the heat exchanger 16 is integrally assembled; a hot water heat exchanger 34 for heating feed water by heating water heated while passing through the sensible heat unit heat exchanger 14; A circulation pump 22 for supplying the heating water passing through the heat exchanger 24 and the water / water separator 26 to the latent heat portion heat exchanger 16; and a heating water supplied by the operation of the three-way valve 28 and the overpressure prevention valve 32. And an expansion tank 48 for storing a part.
[0009]
Further, for the air proportional control, an air pressure detecting unit 50 provided in the suction chamber 6 for sensing the air pressure sucked by the blower 10 is provided, and the pressure is input by the air pressure recognition unit 51 of the air proportional control valve 47. For example, the controller 40 burns the boiler with the gas extracted based on the air pressure detected by the air pressure recognition unit 51, and calculates a heat quantity based on data on whether or not the temperature has reached a set temperature in response to a signal from the temperature sensor. Then, the rotation speed of the blower 10 is duty-controlled, the air pressure is changed by the required rotation speed, and the gas discharge amount of the air proportional control valve 47 is adjusted to adjust the gas amount supplied to the burner 12. I do.
[0010]
More specifically, a burner 12 that burns the supply air and the gas sucked through the suction chamber 6 by the operation of the blower 10 is provided above the combustor 4, and is provided below the burner 12 in order. The sensible heat unit heat exchanger 14 and the latent heat unit heat exchanger 16 are arranged. The sensible heat unit heat exchanger 14 heats the heating water in a process in which the sensible heat generated from the burner 12 comes into direct contact with the heat exchange, and the latent heat unit heat exchanger 16 generates the latent heat generated during the heat contact with the exhaust gas. The heating water is heated by using. The exhaust gas that has passed through the latent heat part heat exchanger 16 is discharged to the outside through the exhaust duct 20, and the condensed water generated in the heat exchange process is collected in the exhaust hood 18 and later discharged to the outside. The temperature of the heating water heated by the operation of the circulation pump 22 while passing through the latent heat part heat exchanger 16 and the sensible heat part heat exchanger 14 in order is sensed by the thermistor 52 and sent to the controller 40.
[0011]
The circulation pump 22 for circulating the heating water is arranged at a lower left portion of the boiler. When the circulation pump 22 is operated, the heating water that has finished heating the room flows into the heating water filter 24 via the line L1. The heating water filter 24 removes impurities contained in the heating water, and the filtered heating water is sent to an upper steam separator 26. The steam separator 26 is for discharging the air contained in the heating water, and discharges the air through the upper air vent.
[0012]
An overpressure prevention valve 32 is provided between the heating water filter 24 and the air / water separator 26 to prevent the pressure of the heating water from excessively increasing. Send to regulate pressure. The heating water that has passed through the steam separator 24 is supplied to the latent heat unit heat exchanger 16 through the line L2 by the operation of the circulation pump 22, and then heated while passing through the sensible heat unit heat exchanger 14 to be heated to the line L3. Is discharged. The heating water discharged through the line L3 is supplied into the room by the operation of the three-way valve 28.
[0013]
In the middle lower part of the boiler is shown a heat exchanger that obtains hot water using the heat of the heating water. The cold water flowing in through the line L6 by the operation of the hot water flow switch 36 is heated while passing through the hot water heat exchanger 34, and then discharged through the line L7. The hot water heat exchanger 34 has a parallel type structure, and by setting the controlled temperature deviation range to a smaller range, the operating range of the boiler can be increased and the emission of harmful gases can be suppressed to the utmost.
[0014]
A gas supply device is provided at the lower right side of the boiler. An air proportional control valve that varies the gas discharge amount while duty-controlling the rotation speed of the blower 10 based on the output signal of the blower 10 transmitted from the controller 40, including the first and second electromagnetic valves 46 and 46 '. The gas introduced through the line L8 by the operation of 47 is supplied to the nozzle 8 on the upper part of the combustor 4 via the line L9. At this time, the supply amount of the gas is varied by the operation of the air proportional control valve 47 to compensate for the supply amount according to the change of the outside air. The supplied gas is ignited and burned by a spark transmitted through an ignition transformer 42 and an ignition rod. Such a series of combustion processes involves input signals of a room temperature controller 38 operated by a user. It is controlled by the controller 40 that has received it.
[0015]
Next, an operation process of the air proportional control type condensing boiler will be described with reference to a block diagram shown in FIG.
The controller 40 calculates the fuel amount based on the optimum air-fuel ratio based on the heating water temperature sensed by the thermistor 52 and various input signals such as the desired room temperature and the desired operation time selected by the user. Next, a signal is sent to the stepless control blower 10 based on the calculated fuel amount to perform duty control, thereby optimally controlling the amount of fuel supplied to the burner 12 with a change in air pressure. The controller 40 sends output signals to the first and second solenoid valves 46 and 46 ', the ignition transformer 42, and the like, in addition to the blower 10, to enable normal operation of the boiler.
[0016]
As described above, in the air proportional control boiler using the wind pressure sensor, when the calorific value is calculated and the rotational speed of the blower 10 is duty-controlled to change the air pressure to a necessary amount, the air pressure changes. The amount of gas supplied to the burner 12 is adjusted by adjusting the gas discharge amount of the air proportional control valve 47.
[0017]
By the way, the above-mentioned air pressure detecting unit 50 transmits the pressure of the air flowing into the blower to the diaphragm when detecting the pressure of the air so that the microswitch attached to the diaphragm opens and closes the electric circuit. There is an on / off type wind pressure switch and an air proportional control type wind pressure switch which sends a signal to an air proportional control valve of a gas pipe in proportion to a decrease in the amount of air to reduce the amount of gas proportionally. This on / off type wind pressure switch has a disadvantage that a specific wind pressure switch must be used depending on the blower since the operating pressure is fixed and used.
[0018]
In addition, the existing air proportional control type wind pressure switch adjusts the gas amount according to the amount of air flowing into the boiler's blower, so if the exhaust flue is blocked by foreign matter and the amount of air supplied from the blower decreases. Therefore, there is a disadvantage that the amount of gas supplied to the boiler is reduced and the output of the boiler is reduced.
[0019]
Also, in the case of an air flow sensor (AFS) applied to an automobile or the like as the air pressure detecting unit 50, if foreign matter is deposited on the sensor surface, the sensitivity decreases, and if the temperature of the air to be measured changes, an error occurs in the flow measurement. This is disadvantageous in that it is more expensive than existing wind pressure sensors.
[0020]
[Problems to be solved by the invention]
The present invention has been devised to solve the above-described problems, and an object of the present invention is to provide a proportional to the amount of air sucked by a wind pressure sensor that detects the amount of air proportionally using a differential pressure. If the amount of air decreases when adjusting the amount of gas supplied, the amount of gas is fixed so that a constant rated output is made to solve the problem that the amount of gas supply decreases and the output of the boiler decreases. Adjusting the number of revolutions of the blower so that the air amount is constant, so that the air amount proportional to the gas amount can always be supplied, so that the rated output of the boiler can be maintained. It is to provide a control boiler.
[0021]
[Means for Solving the Problems]
The present invention for achieving the above-mentioned object is to provide a blower for sucking air through an intake duct in an air proportional control boiler that adjusts an amount of fuel supplied in association with the sucked air; An air pressure detection unit provided in the suction chamber for measuring the air pressure sucked by the blower, an air pressure recognition unit for converting the air pressure measured by the air pressure detection unit into an electric signal and outputting the signal, A fuel control electromagnetic valve for adjusting the supplied fuel amount and a fuel control electromagnetic valve in accordance with the air pressure input from the air pressure recognition unit to control the supplied fuel amount, as well as to supply the fuel. When the air pressure to be sucked changes according to the amount of fuel to be supplied, the rotation speed of the blower is adjusted to maintain the rated output (air input from the air pressure recognition unit). Adjust the fuel control solenoid valve according to the force to control the amount of fuel supplied, and if the suction air pressure changes according to the amount of fuel supplied, adjust the number of revolutions of the blower to rated output And a controller for holding the same).
[0022]
The operation of the present invention configured as described above will be described as follows.
The air pressure detected by the air blower is detected by the air pressure detection unit, and the boiler is operated so that the fuel that is input from the controller through the air pressure recognition unit and that is proportional to the amount of air is supplied by operating the fuel control valve. In addition, when the air pressure changes due to external factors when a constant amount of fuel is supplied for the rated output, the controller controls the rotation speed of the blower to produce air proportional to the amount of fuel supplied. It is operated so that the rated output can be maintained by being sucked.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Note that the present embodiment does not limit the scope of the present invention, but is presented only as an example, and the same parts as those in the conventional configuration are denoted by the same reference numerals and names.
[0024]
FIG. 1 is a configuration diagram showing an air proportional control condensing boiler according to the present invention, and FIG. 2 is a block diagram showing a configuration of an air proportional control boiler using a wind pressure sensor according to the present invention. A substantial difference between the configuration according to the present invention shown in FIGS. 1 and 2 and the conventional device shown in FIGS. 3 and 4 is that the air proportional control valve 47 is replaced by a fuel control electromagnetic valve 60. The same reference numerals are given to the same components as those of the conventional device.
[0025]
As shown here, a blower 10 for sucking air through the intake duct 3, an air pressure detecting unit 50 provided in the suction chamber 6 for measuring the air pressure sucked by the blower 10, An air pressure recognition unit 51 that converts the air pressure measured by the detection unit 50 into an electric signal and outputs the electric signal, a fuel control electromagnetic valve 60 for adjusting a supplied fuel amount, and senses a temperature of the heating water. A thermistor 52, a room temperature controller 38 for a user to operate a series of combustion processes, an ignition transformer 42 for generating and igniting a spark in the supplied gas, and a circulation pump 22 for circulating heating water. The first and second solenoid valves 46 and 46 ′ for adjusting the amount of fuel supplied, the temperature of the heating water sensed by the thermistor 52, and the selection by the user. The optimal heat quantity is calculated based on various input signals of the selected room temperature controller 38 and the like, and the number of revolutions of the blower 10 is controlled by the heat quantity to control the ignition transformer 42 by the air pressure input from the air pressure recognition unit 51. The first and second solenoid valves 46 and 46 'and the circulation pump 22 are operated to adjust the fuel control solenoid valve 60 to control the amount of fuel supplied, as well as to be sucked by the amount of fuel supplied. It comprises a controller 40 'that adjusts the rotation speed of the blower 10 to maintain the rated output when the air pressure fluctuates.
[0026]
Therefore, when the user performs the heating operation of the boiler through the indoor temperature controller 38, the controller 40 'first turns on the circulation pump 22 and the blower 10, and the air pressure detecting unit 50 detects the air pressure by the differential pressure to thereby determine the air pressure. When output to the recognition unit 51, the air pressure recognition unit 51 detects the amount of air currently supplied to the combustion chamber in accordance with the input signal, and controls the rotation speed of the blower 10 so that the air amount required for ignition is obtained. When the appropriate amount of air is reached, the ignition transformer 42 is turned on, the amount of air required for ignition is held for a certain period of time, and then the first and second electromagnetic valves 46 and 46 'are opened by the amount necessary for the current amount of air. When the ignition is performed, the ignition transformer 42 is turned off to start the heating operation.
[0027]
As described above, the controller 40 'ignites the boiler, senses the heating water temperature by means of the thermistor 52, and calculates the required heat quantity by the proportional control formula so that the current heating water temperature is proportionally controlled to the set heating water temperature. The amount of heat is calculated by calculating the number of revolutions of the blower 10 and controlling the blower 10 with the calculated value. The amount of fuel supplied is determined by the air pressure input from the air pressure recognition unit 51 to the appropriate amount of fuel currently required for the burner 12. The fuel control electromagnetic valve 60 is controlled by the value to adjust the fuel amount.
[0028]
Also, when the boiler is rated, the exhaust flue is obstructed by foreign substances and the amount of air is reduced, and a measurement error occurs due to contamination of the air pressure detection unit 50 and a change in the temperature of the inflowing air. In the case where the amount of fuel sucked fluctuates and does not reach the rated output, the amount of air to be sucked is proportionally sucked by the controller 40 'in accordance with the constant amount of fuel flowing through the fuel control solenoid valve 60. By adjusting the rotation speed of the blower 10 so that the amount of air to be sucked in is constant so that the gas amount and the air amount required for the rated output can be always supplied, the combustion efficiency is improved and To minimize emissions and prevent environmental pollution in advance.
[0029]
【The invention's effect】
As described above, the present invention is applied to the case where the air amount decreases when the gas supply amount is adjusted in proportion to the air amount sucked by the wind pressure sensor that detects the air amount proportionally using the differential pressure. In order to solve the problem that the output of the boiler decreases due to the decrease in the supply amount, the rotation speed of the blower is adjusted so that the air amount is constant when the gas amount is fixed so that the constant rated output is made. It is possible to always supply the gas amount and the air amount required for the rated output by adjusting the air amount proportional to the gas amount so that the combustion efficiency can be increased and the emission of harmful gas is minimized to reduce environmental pollution. There is an advantage that it can be prevented in advance.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an air proportional control condensing boiler according to the present invention.
FIG. 2 is a block diagram showing a configuration of an air proportional control boiler using a wind pressure sensor according to the present invention.
FIG. 3 is a configuration diagram showing a conventional air proportional control condensing boiler.
FIG. 4 is a block diagram showing a configuration of a conventional air proportional control condensing boiler.
[Explanation of symbols]
10: Blower 12: Burner 14: Sensible heat part heat exchanger 16: Latent heat part heat exchanger 18: Exhaust hood 20: Exhaust duct 22: Circulation pump 24: Heating water filter 26: Gas-water separator 34: Hot water heat exchange Unit 38: Indoor temperature controller 40, 40 ': Controller 46, 46': First and second electromagnetic valves 50: Air pressure detection unit 51: Air pressure recognition unit 60: Fuel control electromagnetic valve

Claims (1)

In an air proportional control boiler that regulates the amount of fuel supplied in relation to the air taken in,
A blower for sucking air through an intake duct,
An air pressure detection unit provided in a suction chamber for measuring air pressure sucked by the blower,
An air pressure recognition unit that converts the air pressure measured by the air pressure detection unit into an electric signal and outputs the signal.
A fuel control solenoid valve for adjusting the amount of fuel supplied,
Not only can the supplied fuel amount be controlled by adjusting the fuel control solenoid valve according to the air pressure input from the air pressure recognition unit, but the suctioned air pressure varies depending on the supplied fuel amount. A controller that adjusts the rotation speed of the blower to maintain the rated output in the case;
An air proportional control boiler using a wind pressure sensor, comprising:

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