JP2004333058A - Air proportional control boiler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air proportional control boiler, supplying the proper necessary heating value for proportional controlling the hot water temperature to a preset temperature, safely igniting a boiler to perform combustion under the optimum condition even under the abnormal weather condition, thereby improving combustibility, having high efficiency and saving the fuel cost. <P>SOLUTION: This air proportional control boiler directly controls a current proportional gas valve by gas quantity using an inexpensive AC blower, the current proportional gas valve and a gas quantity sensor, whereby the gas quantity can be adjusted in the whole range of gas quantity. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
【Technical field】
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a proportional air boiler, and more particularly, to an inexpensive AC blower, a current proportional gas valve, and a flow rate sensor. The present invention relates to an air proportional control boiler capable of efficiently controlling the air flow over the entire range of air flow by using an inexpensive equipment by enabling the amount to be adjusted.
[0002]
[Prior art and its problems]
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 the air pressure to be supplied, so that combustion efficiency can be increased, emission of harmful gas can be suppressed to a maximum, and environmental pollution can be prevented. .
[0007]
That is, since the variable for adjusting the gas amount changes only depending on the air pressure, a constant amount of gas is discharged for a constant air pressure without constantly controlling the proportional control part of the gas valve, so that a constant air ratio is obtained. Therefore, unlike the on / off type or the current proportional control method, the proportional control can be accurately performed.
[0008]
Such an air proportional control type boiler has been filed by the present applicant under the name of "air proportional control type condensing boiler" and published in Korean Patent (publication numbers 10-2000-26741, 2000.5.15). And registered (Patent No. 270900, 200.8.8 registration).
[0009]
FIG. 3 is a configuration diagram showing a general air proportional control condensing boiler, and FIG. 4 is a block diagram showing a control system configuration of a general air proportional control condensing boiler.
[0010]
First, as shown in FIG. 3, the condensing gas boiler is operated by an air proportional control method in which a constant amount of air is always supplied by adjusting an air pressure according to a temperature change of outside air. According to the overall configuration, a closed main body 2 provided with an intake duct 3 for sucking outside air by the operation of the DC blower 10 and an exhaust duct 20 for discharging burned exhaust gas to the outside; The burner 12 burns a mixture of the gas supplied through the electromagnetic valves 46 and 46 ′ and the air proportional control valve 47 and the air sucked by the DC blower 10, and the sensible heat section heat exchange heats the heating water. A combustor 4 in which a heat exchanger 14 and a latent heat part heat exchanger 16 are integrally assembled; a hot water heat exchanger 34 for heating feed water by heating water heated while passing through the sensible heat part heat exchanger 14; A circulating pump 22 for supplying the heating water passing through the heating water filter 24 and the air / water separator 26 to the latent heat portion heat exchanger 16; and heating introduced by the operation of the three-way valve 28 and the overpressure prevention valve 32. Water And an expansion tank 48 for storing a part thereof.
[0011]
In addition, for air proportional control, an air pressure detecting unit (wind pressure sensor) 50 provided in the suction chamber 6 and sensing the air pressure sucked by the DC blower 10 is provided. When the pressure is input, the controller 40 burns the boiler with the extracted gas based on the air pressure detected by the air pressure recognition unit 51, receives a signal from the temperature sensor, and uses the data as to whether or not the temperature has reached the set temperature. Is calculated, and the rotation speed of the DC blower 10 is duty-controlled to change the air pressure by the required rotation speed, and the gas discharge amount of the air proportional control valve 47 is adjusted to supply the gas supplied to the burner 12. Will be adjusted.
[0012]
More specifically, a burner 12 that burns supply air and gas sucked through the suction chamber 6 by the operation of the DC blower 10 is provided above the combustor 4, and a burner 12 is provided below the burner 12 in order. Further, a sensible heat section heat exchanger 14 and a latent heat section 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 is directly contacted and heat exchanged, and the latent heat unit heat exchanger 16 is generated at the time of thermal contact with the exhaust gas. The heating water is heated using the latent heat.
[0013]
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 then discharged to the outside. By the operation of the circulation pump 22, the temperature of the heating water heated 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.
[0014]
A 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.
[0015]
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. To adjust the pressure. The heating water that has passed through the steam separator 24 is supplied to the latent heat unit heat exchanger 16 via 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.
[0016]
In the middle lower part of the boiler, a heat exchanger for obtaining hot water using the heat of the heating water is shown. 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 deviation range of the controlled temperature to a smaller area than before, the operating area of the boiler is raised to minimize the emission of harmful gases. Can be.
[0017]
A gas supply device is provided at the lower right side of the boiler. The air proportionality that varies the gas discharge amount while duty controlling the rotation speed of the DC blower 10 according to the output signal of the DC blower 10 transmitted from the controller 40, including the first and second electromagnetic valves 46 and 46 '. The gas flowing in through the line L8 by the operation of the control valve 47 is supplied to the nozzle 8 above the combustor 4 through 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 accompanying the change in the outside air. The gas thus supplied is ignited and burned by a spark transmitted through the ignition transformer 42 and the ignition rod. Such a series of combustion processes receives an input signal of a room temperature controller 38 operated by a user. It is controlled by the controller 40.
[0018]
Next, the operation process of the air proportional control type condensing boiler will be described with reference to the 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 detected 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 DC 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 DC blower 10, thereby enabling normal operation of the boiler.
[0019]
As described above, in the air proportional control boiler, when the calorific value is calculated and the rotational speed of the DC blower 10 is duty-controlled to change the air pressure at the required rotational speed, the air proportional control is performed in accordance with the change in the air pressure. The amount of gas supplied to the burner 12 is adjusted by adjusting the gas discharge amount of the valve 47.
[0020]
That is, when the burner is controlled based on the temperature by the AC blower, the current proportional control valve, and the wind pressure sensor which are usually used in the boiler as in the related art, the amount of air supplied to the combustion chamber cannot be grasped. If the gas blows or the flue is clogged, that is, the air volume and gas ratio do not match under abnormal conditions, noise and explosion may occur at the time of ignition, and misfire may occur, and noise and misfire during combustion There are problems such as occurrence of.
[0021]
To solve this, the air proportional control valve 47 is used as the gas valve as described above, and the DC blower 18 is used because a high pressure is required due to the characteristic of the air proportional control valve 47. However, when the DC blower 18 and the air proportional control valve 47 are used, the cost of the product is high, and the amount of gas set in the air proportional control valve 40 does not match the entire air flow, and an error occurs, resulting in an error. There is a problem that it is not practical compared to the price and the efficiency is reduced. Further, there is a problem that the cost of the boiler is increased by using the expensive DC blower 18.
[0022]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention was devised to solve the above-described problems, and an object of the present invention is to use an air volume sensor instead of a conventional wind pressure sensor while using an inexpensive AC blower and a current proportional gas valve. Then, by directly controlling the current proportional gas valve according to the air flow so that the gas amount can be adjusted over the entire air flow range, it is possible to efficiently control the air flow over the entire air flow range using inexpensive equipment. An object of the present invention is to provide an air proportional control boiler.
[0023]
Summary of the Invention
An object of the present invention is to provide an air proportional control boiler that regulates an amount of fuel supplied in association with air to be sucked, an AC blower for sucking air through an intake duct, An air flow sensor provided in a suction chamber for measuring an amount of air sucked by the AC blower, a current proportional gas valve for adjusting an amount of supplied gas, and an air flow sensor for controlling the RPM of the AC blower based on a heat amount; And a controller that adjusts the current proportional gas valve according to the air volume measured in step (a).
The operation of the present invention performed as described above will be described.
After calculating the amount of heat with the controller, the rotation speed of the AC blower is controlled by RPM and the amount of intake air is changed at the necessary number of rotations. By controlling the current proportional gas valve by conversion, the amount of gas can be adjusted over the entire range of air flow.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that this embodiment does not limit the scope of the present invention, but is presented only as an example.
[0025]
FIG. 1 is a configuration diagram showing an air proportional control boiler according to the present invention, and FIG. 2 is a block diagram showing a configuration of a control system of the air proportional control boiler according to the present invention. 1 and 2, the same components as those of the conventional apparatus of FIGS. 3 and 4 are denoted by the same reference numerals.
[0026]
As shown here, an AC blower 60 for sucking air through the intake duct 3, an air flow sensor 70 provided in the suction chamber 6 for measuring the amount of air sucked by the AC blower 60, and the air flow sensor 70 , A current proportional gas valve 80 for adjusting the amount of supplied gas in accordance with the output of the air volume recognition unit 71, and a thermistor 52 for sensing the temperature of the heating water A room temperature controller 38 for operating a series of combustion processes by a user, an ignition transformer 42 for generating and igniting a spark in the supplied gas, a circulation pump 22 for circulating heating water, First and second solenoid valves 46, 46 'for adjusting the amount of fuel to be supplied, the temperature of the heating water sensed by the thermistor 52, and The optimum heat quantity is calculated based on various input signals of the selected room temperature controller 38 and the like, the RPM of the AC blower 60 is controlled based on the heat quantity, and the ignition transformer 42 and the first and the second are controlled by the air quantity measured by the air quantity sensor 70. And a controller 40 'for operating the circulation pump 22 to adjust the gas proportional valve 80.
[0027]
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 AC blower 60, and detects the air volume currently supplied to the combustion chamber by the air volume sensor 70. Then, the RPM of the AC blower 60 is controlled so that the air volume required for ignition is obtained.
[0028]
When the appropriate air volume is reached, the ignition transformer 42 is turned on to maintain the air volume required for ignition for a certain period of time, and then the first and second electromagnetic valves 46 and 46 'are opened as necessary for the current air volume to cause ignition. When done, turn off the ignition transformer and start heating operation.
[0029]
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. Then, the heat amount is calculated into the RPM of the AC blower 60, and the AC blower 60 is controlled by the calculated value, and the supplied fuel amount is changed from the air flow value detected by the air flow sensor 70 to the appropriate fuel amount necessary for the burner 12 at present. The converted value is used to control the current proportional gas valve 80 to adjust the fuel amount.
[0030]
【The invention's effect】
As described above, the present invention uses an inexpensive AC blower, a current proportional gas valve and an air flow sensor, and directly controls the current proportional gas valve according to the air flow, so that the fuel amount can be adjusted to the entire range of the air flow, and the current heating The appropriate amount of heat required for the water temperature to be controlled proportionally to the set temperature can be supplied, and the boiler can be safely ignited and burned under optimum conditions even in abnormal climates or conditions, so that the flammability is improved and the efficiency is improved. The advantage is that the fuel cost can be reduced and the fuel cost can be reduced.
In addition, there is an advantage that the boiler can be used safely and conveniently at a lower price by using an inexpensive AC blower and a current proportional gas valve.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an air proportional control boiler according to the present invention.
FIG. 2 is a block diagram showing a configuration of a control system 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 control system of a conventional air proportional control condensing boiler.
[Explanation of symbols]
10: DC 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: Steam separator 34: Hot water heat Exchanger 38: Indoor temperature controller 40 ': Controllers 46, 46': First and second electromagnetic valves 47: Air proportional control valve 60: AC blower 70: Air flow sensor 71: Air flow recognition unit 80: Current proportional gas valve

Claims (1)

In an air proportional control boiler that regulates the amount of fuel supplied in relation to the intake air,
An AC blower for sucking air through an intake duct;
An air flow sensor provided in a suction chamber for measuring an amount of air sucked by the AC blower;
A current proportional gas valve for adjusting the amount of gas supplied,
A controller that controls the RPM of the AC blower according to the amount of heat and adjusts the current proportional gas valve according to the amount of air measured by the air volume sensor;
An air proportional control boiler comprising:

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