KR100292457B1 - Air ratio control type non-condensing boiler - Google Patents

Abstract

According to the present invention, an air proportional control non-condensing method is provided in which an air proportional control valve is operated in accordance with the pressure of intake air in an air proportional control valve having a pressure detection unit and a pressure recognition unit for detecting the air pressure. The non-condensing boiler is provided with a boiler, which includes an air pressure detector (50) installed in the suction chamber (6) for sensing the air pressure sucked by the blower (10); The controller 40 adjusts the amount of gas supplied to the burner 12 in proportion to the pressure recognized by the pressure recognition unit 51 of the air proportional control valve based on the air pressure sensed by the air pressure detection unit 50. Doing.

Description

Air proportional control noncondensing boiler {AIR RATIO CONTROL TYPE NON-CONDENSING BOILER}

The present invention relates to an air proportional control non-condensing boiler, and more particularly, to an air proportional control non-condensing that controls an air ratio supplied to a burner by operating an air proportional control valve according to the intake air pressure according to a change in the rotational speed of the fan. It's about a boiler.

Boilers commonly used for heating and hot water supply in homes can be divided into oil boilers and gas boilers, depending on the fuel used. Gas boilers use liquefied petroleum gas (LPG) as a raw material, but since they contain little sulfur compared to diesel or kerosene, most LNG is used as a clean fuel to minimize air pollution.

In addition, the gas boiler can be divided into various types according to the control method or the sealed state, and can be further divided into condensing and non-condensing types according to the recovery method of the heat source for heating the heating water. Among them, the condensing boiler has a sensible heat exchanger that directly heats the heating water by using the heat burned by the burner, and a latent heat exchanger that heats the heating water by using latent heat of exhaust gas passing through the sensible heat exchanger. In addition, the non-condensing boiler is equipped only with a sensible heat exchanger.

Conventional methods of controlling the air ratio supplied to the burner of the non-condensing boiler include an on / off control system and a current proportional control system. On / off control system has been used in the past as a way to selectively cut off the supply of gas while being on / off according to the operation signal of the boiler operation switch. In the current proportional control system, the controller sends an output signal to the proportional control valve in response to a change in an input value such as a blower's rotation speed, thereby controlling the air ratio by varying the amount of fuel supplied to the burner.

That is, the current proportional control method controls the air ratio by varying the amount of gas supplied to the burner by selectively and independently controlling the rotation speed control and the gas amount control of the blower.

In the conventional on / off control system, since the air ratio supplied to the burner is kept almost constant, regardless of the amount of air introduced, a constant amount of fuel is always supplied, resulting in low combustion efficiency and excessive emission of harmful gases. Since the current proportional control system controls the air ratio based on the input value and the method of varying the current value applied by the proportional valve such as the number of revolutions of the blower, the responsiveness is low. Regardless, there is a problem in that a constant amount of fuel is supplied, resulting in low combustion efficiency and many emissions of harmful gases.

In order to solve the above problems, the present invention measures the pressure of air introduced from the outside, and then supplies fuel to the burner in proportion to the measured air pressure. The purpose of the present invention is to provide an air proportional control non-condensing boiler which can increase the combustion efficiency and minimize the emission of harmful gas to prevent environmental pollution.

That is, since the variable to control the gas amount is changed only depending on the air pressure, even if the proportional control part of the gas valve is not controlled separately, a certain amount of gas is discharged to a constant air pressure, so that it always has a constant air ratio. Unlike the proportional control method, accurate proportional control is possible.

1 is a block diagram of a non-condensing boiler applying the air proportional control system of the present invention,

Figure 2 is a block diagram showing the configuration of an air proportional control non-condensing boiler according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

10: blower 12: burner

14: heat exchanger 18: exhaust hood

20: exhaust duct 22: circulation pump

24: Heating water filter 34: Hot water heat exchanger

38: room temperature controller 40: controller

46, 46 ': 1st, 2 solenoid valve 47: proportional control valve

50: air pressure detection unit 51: air pressure recognition unit

An object of the present invention described above is an enclosed body having an intake duct for sucking external air and an exhaust duct for discharging the burned exhaust gas to the outside according to the operation of the blower; A burner that burns a mixture of the gas supplied through the first and second solenoid valves and the proportional control valve and the air sucked by the blower, and a heat exchanger that heats the heating water by the heat burned by the burner are integrally assembled. A combustor; A hot water heat exchanger for heating the water supply by the heated heating water while passing through the heat exchanger; A circulation pump for supplying the heating water passing through the heating water filter and the water separator to the heat exchanger; An expansion tank for storing a part of the heating water introduced by the operation of the 3-way valve; An air pressure detection unit installed in the suction chamber to sense air pressure sucked by the blower; The air proportional control non-condensing boiler, characterized in that it comprises a controller for controlling the amount of gas supplied to the burner in proportion to the pressure recognized by the pressure recognition portion of the air proportional control valve based on the air pressure detected by the air pressure detection unit Is achieved.

Here, the air proportional control valve automatically operates in conjunction with the controller according to the air pressure caused by the change in the rotation speed of the fan, thereby controlling the rotation speed of the fan.

Hereinafter, an air proportional control non-condensing boiler according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a non-condensing boiler applying the air proportional control system of the present invention, Figure 2 is a block diagram showing the configuration of a non-condensing boiler according to the present invention.

First, as shown in Figure 1, the condensing gas boiler of the present invention is operated in an air proportional control method so that a constant amount of air is always supplied by adjusting the air pressure in accordance with the temperature change of the outside air. The overall structure thereof includes an airtight main body 2 having an intake duct 3 for sucking external air according to the operation of the blower 10 and an exhaust duct 20 for exhausting the burned exhaust gas to the outside; ; The burner 12 and the heating water for burning the mixture of the gas supplied through the first and second solenoid valves 46 and 46 'and the proportional control valve 47 and the air sucked by the blower 10 are heated. A heat exchanger 14, a combustor 4 which is integrally assembled; A hot water heat exchanger 34 for heating the water supply by the heated heating water while passing through the heat exchanger 14; A circulation pump 22 for supplying the heating water passing through the heating water filter 24 to the heat exchanger 14; It consists of an expansion tank 48 for storing a part of the heating water flowing in accordance with the operation of the three-way valve 28 and the overpressure check valve (32).

In addition, for the air proportional control, an air pressure detection unit 50 is installed in the suction chamber 6 and detects the air pressure sucked by the blower 10, and the pressure recognition unit 51 of the air proportional control valve is installed. When the pressure is input, the controller 40 burns the boiler with the extracted gas based on the air pressure sensed by the air pressure recognition unit 51 and receives the temperature sensor signal to calculate the amount of heat based on the presence or absence of the set temperature. By calculating the duty cycle of the rotational speed of the DC blower 10, the air pressure is changed to the required rotational speed to adjust the gas discharge amount of the air proportional valve to adjust the amount of gas supplied to the burner 12.

In more detail, a blower 10 is disposed below the combustor 4, and a burner 12 that burns the air and the gas sucked through the suction chamber 6 is installed above the blower 10. The heat exchanger 14 is disposed above the burner 12. The heat exchanger 14 heats the heating water while the sensible heat generated from the burner is in direct contact with each other to exchange heat.

The exhaust gas passing through the heat exchanger 14 is discharged to the outside through the exhaust duct 20. According to the operation of the circulation pump 22, the temperature of the heated heating water in the process of passing through the heat exchanger 14 is detected by the thermistor 52, and the controller 40 controls the operating state of the boiler based on the input signal at this time. To control.

In the lower left of the boiler, a circulation pump 22 for circulating the heating water is disposed. When the circulation pump 22 is operated, the heating water which has finished heating in the room flows into the heating water filter 24. The heating water filter 24 removes impurities contained in the heating water, and the filtered heating water is supplied to the heat exchanger 14.

Below the expansion valve 48 is shown a heat exchanger that obtains hot water using the heat of the heating water. The cold water introduced by the operation of the hot water flow switch 36 is heated in the process of passing through the stacked series hot water heat exchanger 34, and then supplied to the required place.

In the lower right part of the boiler, a gas supply device is installed. Air proportional control valve including the first and second solenoid valves 46 and 46 ′, which varies the discharge amount of the gas while controlling the rotation speed of the blower according to the output signal of the blower 10 transmitted from the controller 40. Gas introduced by operation of the 47 is supplied to the burner 12 above the combustor 4. At this time, the supply amount of gas is varied according to the operation of the air proportional control solenoid valve 47 to compensate for the supply amount according to the change of the outside air. The gas thus supplied is ignited and combusted by the spark delivered through the ignition transformer 42 and the ignition rod. This series of combustion processes the controller 40 receiving the input signal from the room temperature controller 38 operated by the user. Controlled by

Next, with reference to the block diagram shown in Figure 2 will be described the operation of the non-condensing boiler of the proportional control method according to the present invention.

The controller 40 calculates the fuel amount based on the optimum air-fuel ratio based on various input signals such as the heating water temperature sensed by the thermistor 52 and the desired room temperature and the desired operating time selected by the user. Next, by controlling the duty by sending a signal to the stepless control DC blower 10 based on the calculated fuel amount, the amount of fuel supplied to the burner 12 is optimally controlled in accordance with the change in air pressure. In addition to the DC blower 10, the controller 40 sends output signals to the first and second solenoid valves 46 and 46 ′ and the ignition transformer 42 to enable normal operation of the boiler.

According to the present invention described above, by measuring the pressure of the air introduced from the outside, and then supplying fuel to the burner in proportion to the measured air pressure, by supplying the correct amount of fuel in proportion to the inlet air pressure, combustion There is an advantage to prevent the environmental pollution by increasing the efficiency and suppressing the emission of harmful gases as much as possible.

Claims (2)

An enclosed main body 2 having an intake duct 3 for sucking external air according to the operation of the blower 10 and an exhaust duct 20 for discharging the burned exhaust gas to the outside; A burner 12 which burns a mixture of the gas supplied through the first and second solenoid valves 46 and 46 'and the air proportional control valve 47 and the air sucked by the blower 10, and the burner A combustor 4 in which a heat exchanger 14 for heating heating water by the heat burned by 12 is integrally assembled; A hot water heat exchanger 34 for heating the water supply by the heated heating water while passing through the heat exchanger 14; A circulation pump 22 for supplying the heating water passing through the heating water filter 24 and the water separator 26; Expansion tank 48 for storing a portion of the heating water flowing in accordance with the operation of the three-way valve 28; An air pressure detector (50) installed in the suction chamber (6) for sensing air pressure sucked by the blower (10); A controller for adjusting the amount of gas supplied to the burner 12 in proportion to the pressure recognized by the pressure recognition unit 51 of the air proportional control valve 47 based on the air pressure sensed by the air pressure detector 50. 40 Air proportional control non-condensing boiler comprising a. The air proportional control non-condensing boiler according to claim 1, wherein the hot water heat exchanger (34) has a stacked series structure.