KR100212514B1 - Control technique for heating of gas boiler - Google Patents

Abstract

The present invention relates to a heating control method of a gas boiler, and more particularly, a gas that can improve durability of an expensive heat exchanger by controlling a combustion state in a burner according to a temperature state of heating water to protect a heat exchanger. The present invention relates to a heating control method of a boiler.

The heating control method of the gas boiler of the present invention supplies a gas to the microcomputer 26 having a program for controlling the entire stroke, a temperature sensing unit 10 for sensing the temperature of the heating water, and a burner 28. In the gas boiler including a gas valve (4) for the purpose and a heat exchanger (30) for transferring heat generated by the burner to the heating water, the temperature sensing unit (10) is removed from the microcomputer (26) when the combustion stroke is performed. A first step of detecting the heating water temperature using; A second step of comparing the detected heating water temperature with a set temperature stored in the microcomputer 26; A third step of adjusting the combustion state in the burner 28 by extending the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is less than the set temperature -α as a result of the comparison; A fourth step of adjusting the combustion state in the burner 28 by shortening the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is larger than the set temperature + alpha; And a fifth step of controlling the combustion state in the burner 28 by maintaining the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is within the set temperature ± α range. Characterized in that consisting of.

Description

Heating control method of gas boiler

The present invention relates to a heating control method of a gas boiler, and more particularly, a gas that can improve durability of an expensive heat exchanger by controlling a combustion state in a burner according to a temperature state of heating water to protect a heat exchanger. The present invention relates to a heating control method of a boiler.

Gas boilers are increasingly being used because of the use of clean fuel gas, which reduces pollutants and reduces environmental pollution. 1 and 2 is a schematic configuration and block circuit diagram of a conventionally used gas boiler has a heating mode for performing indoor heating and a hot water mode for supplying hot water to the bathroom or sink. Referring to Figures 1 and 2 will be described briefly the operating state.

As shown in FIG. 1, the gas boiler controls the gas valve 4 to supply a predetermined amount of gas to the burner 28 while igniting and burning it in the burner 28 and using high temperature heat generated at this time. to be. The ignition in the burner 28 applies a high voltage to the igniter 22 after the gas is supplied and ignites the gas by the spark generated at this time. The hot heat generated by the ignition rises and heats the heat exchanger 30 installed on the upper side of the burner 28. The detection of the ignition state is detected by the salt voltage detection unit 12 by transmitting the ignition state data to the microcomputer 26. In the heat exchanger 30, heating water and direct water flow, respectively. Direct water flows in through the direct water supply pipe 2a, passes through the heat exchanger 30, and is discharged through the other end of the direct water supply pipe 2a after the water temperature is elevated by heat exchange with the heating water.

On the other hand, the heating water passes through the supply pipe 38 is moved to the pipe (not shown) installed indoors. At this time, the movement to the water tank 34 or the circulation pump 20 by the three-way side 36 is blocked. The heat is deprived of heat while passing through the heating pipe installed in the room, and the temperature of the heated water is introduced into the water tank 34. The water tank 34 is a temporary storage of the heating return water and is also connected to the automatic refill water valve 18 for replenishing insufficient heating water. The automatic refill water valve 18 is connected to the direct water supply pipe 2a to replenish water when the water tank 34 lacks water. The heating water introduced into the water tank 34 passes through the three-way valve 36-the circulation pump 20-the return pipe 40 and then enters the heat exchanger 30 to be heated up, and then through the supply pipe 38. Repeat the cycle.

In the conventional gas boiler as described above, when the ignition stroke is performed, the microcomputer 26 measures the temperature of the heating water, calculates the amount of heat generated accordingly, and then outputs a control signal to the gas valve 4 at the microcomputer 26 so as to obtain a maximum value. After burning, if the set temperature was exceeded, the gas consumption corresponding to the calorific value calculated thereafter was supplied. However, this has the effect of rapidly raising the temperature of the heating water, but there was a problem that the heat exchanger 30 that transfers heat from the burner 28 to the heating water is overheated.

That is, when the temperature of the heating water is low, there is no fear of overheating. However, when the operating time of the boiler has elapsed and the temperature of the heating water is high, the gas supply amount is constant when the moving time between the current value steps of the gas valve is constant as in the prior art. The heat exchanger was overheated because it increased.

The present invention has been made to solve the above problems, an object of the present invention to improve the durability of the heat exchanger which is an expensive device by controlling the combustion state in the burner according to the temperature state of the heating water to protect the heat exchanger. It is to provide a heating control method of a gas boiler.

The heating control method of the gas boiler of the present invention for achieving the above object, the microcomputer 26 with a program for controlling the entire stroke, a temperature sensing unit 10 for sensing the temperature of the heating water, burner ( 28. A gas boiler comprising a gas valve 4 for supplying gas to the gas 28 and a heat exchanger 30 for transferring heat generated by the burner to the heating water, wherein the temperature at the microcomputer 26 when the combustion stroke is performed. A first step of detecting the heating water temperature using the detection unit 10; A second step of comparing the detected heating water temperature with a set temperature stored in the microcomputer 26; A third step of adjusting the combustion state in the burner 28 by extending the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is less than the set temperature -α as a result of the comparison; A fourth step of adjusting the combustion state in the burner 28 by shortening the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is larger than the set temperature + alpha; And a fifth step of controlling the combustion state in the burner 28 by maintaining the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is within the set temperature ± α range. Characterized in that consisting of.

1 is a schematic configuration diagram of a gas boiler conventionally used;

FIG. 2 is a schematic block circuit diagram of the gas boiler of FIG. 1;

3 is a table showing a gas valve current value setting state of a conventional gas boiler;

4 is a flowchart for explaining the method of the present invention.

* Explanation of symbols for main parts of the drawings

2: flow switch, 4: gas valve,

6: fan rotation speed detection unit, 8: water level detection unit,

10: temperature detection unit, 12: salt voltage detection unit,

14: exhaust fan, 16: power supply,

18: automatic refill water valve, 20: circulation pump,

22: igniter, 24: room cone,

26: microcomputer, 28: burner,

30: heat exchanger, 32: exhaust hood,

34: water tank, 36: three-way,

38: return pipe, 40: supply pipe.

Hereinafter, the heating control method of the gas boiler of the present invention with reference to the accompanying drawings in detail as follows.

The method of the present invention is a method of preventing the heat exchanger from overheating by adjusting the amount of heat generated by appropriately controlling the gas consumption by varying the current value of the gas valve in accordance with the temperature of the heating water during the combustion operation of the gas boiler. The value is achieved by varying the travel time between the set steps.

The method of the present invention as described above comprises the following steps: a first step of detecting the heating water temperature using the temperature sensing unit 10 in the microcomputer 26 when the combustion stroke is performed; A second step of comparing the detected heating water temperature with a set temperature stored in the microcomputer 26; A third step of adjusting the combustion state in the burner 28 by extending the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is less than the set temperature -α as a result of the comparison; A fourth step of adjusting the combustion state in the burner 28 by shortening the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is larger than the set temperature + alpha; And a fifth step of controlling the combustion state in the burner 28 by maintaining the step-by-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is within the set temperature ± α range. It consists of.

The method of the present invention is performed in a normal combustion state, and when the combustion stroke is performed, the microcomputer 26 measures the heating water temperature from the temperature sensing unit 10. The temperature sensing unit 10 is a temperature sensor 10a installed on the supply pipe 38 to measure the temperature of the heating supply water or a temperature sensor 10b installed on the return pipe 40 to measure the temperature of the heating return water. Is measured from The heating water temperature may be set by selecting either the temperature of the heating return water or the heating supply water. For convenience of description, the following description will be made based on the heating water temperature.

When the heating water temperature is measured by the temperature sensor 10a of the temperature sensing unit 10, the microcomputer 26 compares this with the set temperature stored in the microcomputer. The set temperature is a heating water temperature set by the user, and usually has an upper and lower allowable range of about α.

First, the step of a gas valve current value is demonstrated using FIG. In the gas boiler, when the heating water temperature is set by the user, the gas consumption is supplied through the gas valve 4 to increase the temperature of the heating water after measuring the current heating water temperature and calculating the calorific value accordingly. Initially, the step Sn is gradually raised from the minimum value MIN (S1) to reach an appropriate step. At this time, the movement time between steps has been set to one fixed value. Therefore, the time taken to reach the maximum value Sn from the minimum value S1 becomes (t * n).

As a result of the comparison in the microcomputer 26, if the heating water temperature measured by the temperature sensor 10a is less than (the set temperature-α), it is necessary to cut off the supply of rapid calorific value while ensuring sufficient heat quantity, so that the heat exchanger 30 Since the overheating can be prevented, the microcomputer 26 gradually increases the interstep movement time of the gas valve current value as compared with the conventional one. Therefore, the gas consumption used for combustion in the burner 28 gradually rises. At this time, if the delay time between steps is 10 seconds in the past, for example, it can be set to about 10 to 20 seconds.

As a result of the comparison, if the heating water temperature measured by the temperature sensor 10a is greater than (the set temperature + α), since the heating water temperature is overheated, the microcomputer 26 reduces the gas valve current value in order to reduce the supply of gas consumption. At this time, the falling time between steps is rapidly lowered, thereby rapidly reducing the gas consumption. Therefore, since the amount of heat generated in the burner 28 is reduced, it is possible to prevent the heat exchanger 30 from overheating. It is preferable to shorten the movement time between the steps, for example, it can be set to about 0.1 to 02. seconds.

In addition, if the heating water temperature is within the range of (set temperature ± α), rather than the above two cases, the microcomputer 26 recognizes the normal heating water temperature and follows the step movement time of the gas valve current value that has been set in the past. At this time, the step-to-step movement time of the gas valve current value can be set to, for example, about 5 to 10 seconds. After the step-to-step movement time of the gas consumption is determined as described above, the proportional control is performed in the same manner as described above.

As described above, according to the present invention, by controlling the combustion state in the burner according to the temperature state of the heating water, the heat exchanger is protected, thereby increasing the durability of the heat exchanger, which is an expensive device.

Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will be within the scope of the appended claims. .

Claims (2)

Microcomputer 26 with a program for controlling the entire stroke, a temperature sensing unit 10 for sensing the temperature of the heating water, a gas valve 4 for supplying gas to the burner 28, and a burner In the gas boiler comprising a heat exchanger (30) for transferring the generated heat to the heating water, A first step of detecting a heating water temperature using the temperature sensing unit 10 in the microcomputer 26 when the combustion stroke is performed; A second step of comparing the detected heating water temperature with a set temperature stored in the microcomputer 26; A third step of adjusting the combustion state in the burner 28 while extending the inter-step movement time of the gas valve 4 in the microcomputer 26 when the heating water temperature is less than the set temperature -α as a result of the comparison; A fourth step of adjusting the combustion state in the burner 28 while shortening the movement time between the steps of the gas valve 4 in the microcomputer 26 when the heating water temperature is greater than (set temperature + alpha); And If the heating water temperature is within the range of (set temperature ± α), the fifth step of controlling the combustion state in the burner 28 by maintaining the movement time between steps of the gas valve 4 in the normal state in the microcomputer 26 Heating control method of a gas boiler, characterized in that configured. 2. The step moving time in claim 3, wherein the step moving time in the third step is 10 to 20 seconds, the step moving time in the fourth step is 0.1 to 0.2 seconds, and / or the step moving time in the fifth step. The heating control method of the gas boiler characterized by setting to 5 to 10 second.

Images