KR20000041753A - Method for controlling circulation pump in gas boiler in response to flow quantity and velocity of circulating flow - Google Patents

Abstract

PURPOSE: A method for controlling circulating pump in gas boiler in response to flow quantity and velocity of circulating flow is provided to operate a circulating pump in response to a measured revolution frequency by determining a temperature difference between an outlet temperature of heating water and an inlet temperature of heating water flowing back in a gas boiler, an amount of input gas, a theoretical amount of air, and a revolution frequency of an exhaust fan. CONSTITUTION: A method for controlling circulating pump in gas boiler in response to flow quantity and velocity of circulating flow comprises the following steps: a step for detecting a state of a system in a gas boiler(S2, S3, S4, S7); a step for measuring a coefficient of error(S8, S9); a step for estimating a temperature difference between a first thermistor and a second thermistor(S13); a step for estimating an amount of input gas in response to the temperature difference(S14); a step for estimating a theoretical amount of air according to the decision of the amount of input gas(S15); a step for determining a revolution frequency of a exhaust fan in response to the theoretical amount of air(S16); a step for estimating a continuous circulating amount in response to the decision of the temperature difference, the amount of input gas, and the revolution frequency of the exhaust fan(S17); a step for operating a pump according to a complete ignition(S19); a step for detecting a revolution frequency of the pump(S20); a step for detecting a flow quantity and flow velocity resulted from the continuous circulating(S21); a step for operating the pump in response to the continuous circulating amount(S22); and a step for operating the pump following by detecting an error against a target value and correcting the error value(S23).

Description

Circulating Pump Control Method of Gas Boiler According to Circulating Flow Rate and Flow Rate

The present invention relates to a method of controlling a circulating pump of a gas boiler, and more particularly, to determine the temperature difference, the gas input amount, the theoretical air amount, and the rotation speed of the exhaust fan in the gas boiler to determine the rotation speed of the circulating pump. And a method of driving the circulation pump according to the determined rotation speed.

In general, a circulating pump installed in a conventional gas boiler system has always been rotated at a constant speed during operation, or a very monotonous operation control that is strongly rotated during combustion and slightly rotated during fire extinguishing.

Therefore, constant rotation is performed regardless of heating pipe resistance or heating load. As combustion and fire extinguish irregularly, the difference between heating tapping temperature and heating return temperature is large, so that the difference in indoor temperature is large when burning and extinguishing. In addition, the heating efficiency is lowered, as well as there was a problem that can not be made comfortable heating.

In order to solve such a conventional problem, a method of controlling the rotation speed of the circulation pump by using a thermistor on the heating tapping side and the heating return side, respectively, has been suggested.

However, the circulation pump control method as described above has proposed a method of controlling two stages (high speed, low speed circulation pump control) or three stages (high speed, medium speed, low speed) by using the temperature difference between the heating tapping side and the heating return side. Not only is there no verification method for the operation of the circulation pump, but it still remains a problem that it is difficult to perform a quick and accurate proportional control only by the temperature difference of each hot water.

The present invention has been made to solve the problems of the prior art operating as described above, the object of the present invention is to detect the temperature difference between the heating tapping temperature and the heating return temperature, gas input amount, theoretical air amount, exhaust fan rotation speed The present invention provides an optimization of gas consumption by suggesting a method of controlling the rotational speed of the circulation pump, and realizes complete proportional control of the gas boiler system by checking the operation of the circulation pump and correcting the error thereof.

1 is a system diagram applied to the circulating pump control method of the gas boiler of the present invention,

2 is a flowchart illustrating a method of controlling a circulation pump of a gas boiler according to the circulation flow rate and flow rate of the present invention.

<Description of the symbols for the main parts of the drawings>

10: combustor 13: blower 18: exhaust

20: water tank 21: electrode 26: circulation pump

35: tap water supply side 50: gas pipe 53: gas proportional side

TH1: Thermistor 1 TH2: Thermistor 2

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be more apparent from the following detailed description based on the accompanying drawings in order to achieve the above object.

Figure 1 shows a gas boiler (1) to which the control method of the present invention is applied, which is installed in a casing (2) of the gas boiler (1) to burn a gas to heat hot water for heating or hot water supply (10). ), A water tank 20 for storing heating circulation water, and a secondary heat exchanger 30 having different paths for circulation of hot water and cold water.

At this time, a burner group 12 including a plurality of burners is formed in the casing 11 of the combustor 10, and a primary heat exchanger 14 is installed in the upper direction thereof to prevent overheating and the water passing therethrough. The burner group 12 is heated, and a blower 13 for supplying combustion air is installed at the bottom of the combustor casing 11, and the burner group 12 is provided near the burner group 12. The spark coupler 15 for ignition and the frame rod 16 for detecting the ignition of the burner group are installed, and an exhaust unit 18 for discharging the exhaust gas is provided on the upper surface of the combustor casing 11. It is formed through the casing 2 of 1).

In addition, a gas pipe 50 for supplying gas is installed below the burner group 12, wherein two electron valves 51 and 52 for passing the gas at the time of energization and a proportional valve for adjusting the gas supply amount are provided. 53 is provided upstream of the gas pipe 50 with respect to the gas supply path.

In addition, the water tank 20 has a high water level detection sensor 21 for detecting the quantity of water in the water tank, an overflow pipe 22 for discharging excess water, and a low water level detection for detecting whether water is empty in the pipeline. The sensor 32, the heating return pipe 24 in which the water separator 23 is installed, and the water supply pipe 25 for supplying water to the primary heat exchanger 14 by recovering the heating water rotated on the floor. A circulation pump 26 for adjusting the circulation of water is installed downward.

On the other hand, in the secondary heat exchanger 30, thermistor 1 (TH1) for detecting the direct heating and tapping side temperature of hot water supplied to the user by discharging water through tap water and thermistor 2 (TH2) for detecting the heating return side temperature. The hot water discharge tube 31 is attached, the cold water from the outside of the gas boiler flows into the water flow switch 33 for detecting the presence or absence of water flow and a certain amount according to the direct water temperature to obtain a stable temperature characteristics The direct inflow pipe 34 and the water supply pipe 25 having a mechanical automatic quantity control device are connected to the heating hot water supply pipe 37 through which water for heating passes through the three-way valve 36.

In addition, between the heating return pipe 24 and the direct water inlet pipe 34 is provided with a tap water supply side 35 for replenishing water when the water tank 20 is insufficient, clogging of the heating filter, heating distributor The bypass pipe 38 is installed to prevent the pressure from rising inside the gas boiler 1 and to circulate the flow of water by making an internal closed circuit of the gas boiler 1 when the heating pipe is blocked. The low temperature sensing thermistor TH3 is formed in the casing 2 of the gas boiler 1.

2 is a flowchart illustrating a method of controlling a circulation pump of a gas boiler according to the present invention.

The circulation pump control method of the gas boiler according to the circulating flow rate and flow rate according to the present invention is the state of each component of the gas boiler system (water level, frozen state, ground fault, thermistor 1, thermistor 2, the state of the exhaust fan, the pump After detecting the state), if there is no abnormality, the error coefficient according to the state detection is obtained. The temperature difference from thermistor 1 and thermistor 2 is obtained, the gas input amount corresponding to the temperature difference is calculated, the theoretical air amount is obtained, and the rotation speed of the exhaust fan is determined according to the theoretical air amount. In addition, after determining the peristaltic circulation by determining the temperature difference, the gas input amount, and the rotation speed of the exhaust fan, driving the pump according to the saturation, detecting the rotation of the pump, and detecting the flow rate and the flow rate according to the peristaltic circulation, This drives the pump according to the peristaltic circulation. And it is configured to detect the error to the target value, and correct the error value to drive the pump at a constant speed.

The invention can be variously modified and can take various forms and only the specific examples thereof are described in the following detailed description of the invention. It is to be understood, however, that the invention is not limited to the particular forms mentioned in the detailed description of the invention below, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. It should be understood to do.

Referring to the operation of the present invention made of the above configuration as follows.

2 is a flowchart illustrating a method of controlling a circulation pump of a gas boiler according to the circulation flow rate and flow rate of the present invention. Referring to Figures 1 and 2 will be described a preferred embodiment of the present invention.

When power is supplied to the system (S1), the state of the configuration of each system is automatically detected. That is, the water level is detected due to the short circuit of the electrode 21 (S2), when the low water level is detected, the water replenishment is made by the tap water supply side 35 (S5). In addition, by detecting the temperature of the low-temperature sensing thermistor (TH3) and thermistor 1 (TH1) and thermistor 2 (TH2) to detect complete freezing (S3), by detecting the short circuit of the circuit (S4), thermistor 1 Abnormalities of (TH1) and 2 (TH2) are detected (S7). If there is an abnormality in the state detection of the component is treated as an error to stop the circulation pump 26 (S6).

After detecting the safety check state, the exhaust fan is preliminarily operated (S8) in order to detect an error coefficient for each component, and whether or not the system is abnormal is detected, and a rotational error of the exhaust fan is detected (S9). Further, the circulation pump 26 is preliminarily operated (S10) to detect the rotational error of the circulation pump 26 (S11), and then the flow rate of the circulation passages 24, 25 and 37 is detected (S12) to obtain an error coefficient.

After calculating the error coefficient, the hot water temperature on the heating tapping side and the hot water temperature on the heating tapping side are inputted from the thermistor 1 (TH1) and thermistor 2 (TH2) to calculate the respective control amounts. The temperature difference ΔT is obtained from the absolute value obtained by subtracting the temperature of the side (S13). The gas input amount is determined by controlling the gas proportional side 53 of the gas pipe 50 entering the combustor 10 based on the calorie value obtained by calculating the relationship between the temperature difference between thermistor 1 and thermistor 2 and the target temperature according to the obtained temperature difference. (S14).

In order to control the amount of oxygen required to burn the gas to calculate the theoretical amount of air flowing through the blower 13 (S15), the Weber (WEBER) index or the like is used. The theoretical air amount is calculated to be different depending on the type of gas used. After the theoretical air amount is calculated, the rotation speed (RPM) of the exhaust fan installed in the exhaust unit 18 is determined according to the heat amount and the theoretical air amount according to the temperature difference (S16).

As a result, the interlocking circulation flow rate and the flow rate according to the temperature difference ΔT, the gas input amount, and the rotation speed of the exhaust fan can be obtained (S17). The rotation speed of the circulation pump 26 is determined by determining the peristaltic circulation flow rate and flow rate (S18). At this time, by igniting with a small amount of gas in order to prevent explosion ignition at first, while slowly driving the circulation pump 26 (S19), the rotation speed is detected (S20) and the flow rate and flow rate are measured accordingly (S21).

Accordingly, the circulation pump 26 is driven at a constant speed according to the interlocking circulation flow rate and the flow rate (S22), the rotation speed of the circulation pump 26 is detected, and the error of the target value is detected (S23). The circulation pump 26 is driven again.

According to the present invention, the gas consumption is optimized for the system of the gas boiler, thereby providing high efficiency. After detecting and determining the state of each component, the peristaltic circulation flow rate and flow rate are determined, and the circulating pump is driven at an appropriate rotational speed to achieve high thermal efficiency that can be adapted to all other environments. In addition, although the conventional system was not able to cope precisely with the elements (for example, the rotational speed of the exhaust fan, the rotational speed of the circulation pump, the gas input amount, etc.) driven by the fixed input value, the control of the present invention was not possible. It is clear that the method is a very original and inventive invention that provides full proportional control to ensure adaptability and thermal efficiency to the optimal system.

Claims (6)

In a method of driving a pump of a gas boiler, Detecting the state of the gas boiler system, Calculating the error coefficient, Obtaining the temperature difference from thermistor 1 and thermistor 2, Determining a gas input amount according to the temperature difference, Obtaining a theoretical air amount according to the determination of the gas input amount, Determining a rotation speed of the exhaust fan according to the theoretical air amount, Determining the interlocking circulation amount by determining the temperature difference, the gas input amount, and the rotation speed of the exhaust fan; Driving the pump according to perfection, Detecting rotation of the pump; Detecting the flow rate and the flow rate according to the peristaltic circulation, Driving a pump according to the peristaltic circulation amount, and And detecting the error with respect to the target value, and correcting the error value to drive the pump. The method according to claim 1, In the step of detecting the state of the gas boiler system, the configuration of the system to be detected is characterized by consisting of water level detection, complete freeze detection, ground fault detection, abnormal detection of thermistor 1 and thermistor 2, rotation detection of the exhaust fan and pump. Circulation pump control method of gas boiler according to circulation flow rate and flow rate. The method according to claim 2, If there is an error in the configuration of each system after the detection, it is set to the error mode, the pump operation method of the gas boiler according to the circulating flow rate and the flow rate, characterized in that to stop the operation of the pump. The method according to claim 1, In the process of obtaining the temperature difference between thermistor 1 and thermistor 2, the thermistor 1 measures the temperature of the hot water on the tapping side, the thermistor 2 operates to measure the temperature of the hot water on the return side, and the temperature difference is thermistor 2 at the measured temperature of the thermistor 1 Circulating pump control method of a gas boiler according to the circulating flow rate and flow rate, characterized in that it is obtained by subtracting the measured temperature of. The method according to claim 1, The theoretical air amount is a difference in the air amount according to the type of gas, the circulation pump control method of the gas boiler according to the flow rate and flow rate. The method according to claim 1, The driving of the pump according to the ignition is ignited with a small amount of gas in order to prevent the explosion ignition and the pump operation of the circulating pump according to the circulating flow rate and flow rate, characterized in that for slowly operating the pump.