KR20020007669A - Air purge method of gas heater - Google Patents

Abstract

PURPOSE: An air purging method of a gas boiler is provided to improve the delay of initial ignition time and inconvenience after installation of a boiler by discharging nitrogen and air for examination of airtightness in a gas pipe and to produce a reliable product. CONSTITUTION: An air purging method comprises the steps of: generating a buzzer sound for warning with response to the input of an air purge command; performing ventilation by turning on a motor for combustion; presuming to operate an ignition transformer by outputting control signals corresponding to a flame sensing signal and a microcomputer congestion sensing signal; and stopping operation after supplying gas by opening gas valves and operating a combustion motor for a specific time(t). Therefore, nitrogen and air existing in the gas pipes and a flue are discharged.

Description

Air purge method of gas heater

The present invention relates to an air purge method of a gas heater, and more particularly, to easily discharge nitrogen and air injected in order to check airtightness in a gas pipe, thereby preventing initial ignition time delay and inconvenience after installing a product. The present invention relates to an air purge method of a gas heater for improving and providing a reliable product.

Nitrogen gas is often injected to check the gas tightness of the gas pipe after installing the gas heater that burns the gas for the first time. However, since nitrogen has an incombustibility, it interferes with combustion, and thus, a process of releasing nitrogen gas after the airtightness test is completed is required.

Conventionally, in order to discharge unnecessary nitrogen in the gas pipe, if the gas smells while discharging nitrogen inside the pipe while the gas pipe is removed, connect the gas pipe to the gas heater, ventilate the room, and then perform the ignition stroke to operate the heater. I was. Alternatively, the gas pipe was connected first, and then the operation / stop key was pressed to repeat the initial air purge stroke to discharge nitrogen in the pipe and the air introduced during use and to ignite.

However, in the conventional method as described above, if there is a small amount of residual nitrogen or residual air in the pipe, the ignition can be performed quickly by one or two ignition operations. Otherwise, the ignition takes a long time and in the severe case, the ignition inability is severe. There have been many cases of restart operation.

The present invention has been made to solve the above problems, the object of the present invention is to easily discharge nitrogen and air for gas tightness in the gas pipe to improve the initial ignition time delay and inconvenience after installation and reliability It is to provide an air purge method of a gas heater that can provide a product.

Air purge method of the gas heater of the present invention for achieving the above object, the first step of generating a buzzer sound for warning when the input of the air purge command, and after the buzzer sound is generated to perform the ventilation by turning on the combustion motor The second step, and the third step of outputting the control signal corresponding to the ignition transformer output signal to simulate the operating state of the ignition transformer, and the control signal corresponding to the flame detection signal and the microcomputer explosion detection signal to output a normal combustion state A fourth step of disguising, and a fifth step of supplying gas by turning on the gas valves and stopping the operation after operating the combustion motor for a predetermined time (t). According to another embodiment of the present invention, a gas detection sensor is installed on a part of the gas supply pipe, and a gas movement state is sensed to detect when the gas moves to a degree of ignition so that the combustion motor and the virtual operation control signals are turned off. do.

1 is a circuit diagram for performing a conventional ignition / air purge function used in the present invention,

2 is a control signal output state diagram for performing a conventional ignition / air purge operation,

3 is a flowchart showing an operating state of the ignition / air purge circuit of FIG. 2;

4 is a flowchart showing an air purge method for a gas heater according to the present invention.

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

10: safety detection unit 10a: ignition transformer signal terminal

10b: salt detection signal terminal 10c: micom congestion detection signal terminal

12: comparator 14,16: transistor

18: gas valve 1 20: gas valve 2

22: output IC 24: control microcomputer

26: gas detection unit

Hereinafter, the air purging method of the gas heater of the present invention will be described in detail with reference to the accompanying drawings.

Method of the present invention, by adding a separate air purge function for the initial operation during the control process of the conventional gas heater, a method that can quickly and easily and safely discharge nitrogen and air during the trial run, separately before the operation mode It is equipped with a command input key, and when pressed, the gas heater can be quickly commissioned by quickly discharging the gas unnecessary for combustion to the outside. This also has the advantage of being applicable even when unburned gas is present in the gas pipe.

First, a circuit and an operating state of a conventional gas heater will be described with reference to FIGS. 1 to 3. 1 is a configuration diagram of an initial ignition circuit of a gas heater, in which an operation signal is input through an ignition transformer signal terminal 10a provided in the safety detection unit 10 at the time of ignition. When the driving signal is input, the output of the comparator 12 is inverted from high to low. Accordingly, the transistor 14 is turned on, and relays Ry connected to the gas valves 1 and 2 (18 and 20) are operated to supply gas through the gas valves 1 and 2 (18 and 20). . Reference numeral 16 denotes a transistor which performs a conventional signal amplification and switching function.

In addition, after the ignition is completed, the flame state is detected through the salt detection signal terminal 10b. When the flame is normally detected, the output of the comparator 12 maintains a low state, and accordingly, the relay Ry of the gas valves 1, 2 (18, 20) is continuously operated. If the flame is extinguished, the output of the comparator 12 becomes high due to the signal input through the salt detection signal terminal 10b, and accordingly, the transistor 14 is turned off so that the gas valves 1, 2 (18, 20). ), The relay Ry is turned off and the gas supply is cut off.

2 is a time difference art showing a voltage application state at the time of driving / stopping.

As shown, power is first supplied to a combustion motor (not shown) to perform air purging for about 50 seconds at the maximum rotation speed, and after 50 seconds, the rotation speed is reduced and operated. In addition, power is applied to the ignition transformer (not shown) after about 57 seconds to generate a spark discharge in the igniter. At the same time, after about 58 seconds, the gas valve 1 is opened to supply gas, and after about 59 seconds, the proportional valve is opened to supply gas, and after about 60 seconds, the gas valve 2 20 is opened to supply gas. Spark discharge by the igniter is performed for about 6 seconds to ignite the supplied gas. When the ignition is successfully completed, a signal is input through the salt detection signal terminal 10b of FIG. 1, and accordingly, the relays of the gas valves 1 and 2 (18 and 20) are normally operated to supply gas. If the ignition or gas combustion fails in an abnormal way, the gas valves 1 and 2 (18, 20) are shut off, which stops the gas supply and maintains a safe state. The control signal is normally output from the control microcomputer 24 to operate the gas heater.

In general, the ignition process for gas indicates the ignition failure status to the user after about 5 times of ignition attempts have failed, and performs the fire extinguishing operation (burner, motor is "strong", and blower fan is operated in "medium" state). . If the ignition is completed normally, perform basic combustion for 25 seconds and perform normal combustion. At this time, when extinguishing conditions are reached, the extinguishing administration is performed for about 90 seconds and ends.

The method of the present invention is carried out as a previous step of a conventional air purge as described above. In other words, after the pre-purification (60 seconds) and the ignition stroke are performed, the pseudo signal is used to establish the pseudo operation state in the normal operation state by using a virtual signal, and then almost exhausts nitrogen or air in the pipe and facilitates the ignition stroke. It can be done. The method of the present invention can also be applied to prevent the combustion of the air remaining in the pipe of the gas heater or the gas movement in the pipe or the combustion delay due to unburned gas during long time use.

4 is a flowchart illustrating a first embodiment of the method of the present invention, in which a first step of generating a buzzer sound for warning when an input of an air purge command is detected, and turning on the combustion motor after the buzzer sound is generated to generate ventilation; A second step of performing; and a third step of disguising the operation state of the ignition transformer by outputting a control signal corresponding to the ignition transformer output signal; and a control signal corresponding to the flame detection signal and the microcomputer runaway detection signal and outputting normal combustion. And a fourth step of disguising the state and a fifth step of supplying gas by turning on the gas valves and stopping the operation after operating the combustion motor for a predetermined time (t).

The control process by the method of the present invention can be inserted between the process of querying the operating conditions of FIG. 3 and the pre-purification (60 seconds) and the ignition step. Although not shown in detail, the operating conditions are divided into ignition and blowing. This will be described with reference to the circuit diagram of FIG. 1.

First, as a first step, the user inputs a command by pressing a function key (not shown) for performing an air purge (or "test mode"). The air purge function key may be installed in a key input unit (not shown) of a conventional gas heater or may be configured by using a combination of other keys, and the command of the function key is input to the control microcomputer 24.

If a command by air purge function key is input, it outputs buzzer sound for warning to user. Buzzer sound output is performed through a buzzer mounted on a conventional gas heater.

After the warning by the buzzer sound is reported as described above, as the second step, the combustion motor is turned on. As the combustion motor is turned on, nitrogen and air remaining in the gas pipe and inside the exhaust communication are discharged by an exhaust fan connected to the combustion motor.

At the same time, the ignition transformer signal terminal 10a, the salt detection signal terminal 10b, and the microcomputer runaway detection signal terminal 10c included in the conventional safety detection unit 10 all have the same state as performing a normal combustion operation. . In other words, a virtual circuit is configured on the signal terminals 10a, 10b, and 10c so as to be judged to be in a normal combustion state, and a control signal is output. In practice, the ignition transformer is configured to be inoperative.

This can be achieved by connecting the signal output terminals L1, L2, L3 of the control microcomputer 24 and outputting a predetermined signal as shown in FIG. In the control microcomputer 24 connected as described above, when the same signal as that generated during the actual ignition transformer operation is input to the ignition transformer signal terminal 10a, the comparator 12 is in a high state to a low state. Is changed to In addition, the salt detection signal terminal 10b and the microcomputer congestion detection signal terminal 10c also input a signal in a normal operating state, respectively. Accordingly, the gas valves 1, 2 (18, 20) are normally operated so that gas is supplied through the valves. Therefore, there is an effect that the gas is normally supplied and the nitrogen and the air existing in the gas pipe and the exhaust communication are discharged.

In the above state, the operation is stopped after the combustion motor is operated for a predetermined time t. The predetermined time (t) is preferably operated for a sufficient time to discharge nitrogen, air or unburned gas in the gas pipe, which can be obtained by experimentation depending on the length of the pipe.

After the operation of the combustion motor is stopped and the output of the virtual control signals output from the control microcomputer 24 is stopped, the pre-purification (60 seconds) and the ignition stroke shown in FIG. 3 are performed. Since it is the same method as the conventional method, detailed description thereof will be omitted.

In addition to obtaining a predetermined time t as described above, the air purge time may be determined by detecting a gas movement state. This is the second embodiment of the present invention.

In other words, in the first embodiment, a control signal is output to the ignition transformer signal terminal 10a, the salt detection signal terminal 10b, and the microcomputer explosion detection signal terminal 10c so as to satisfy the virtual operation condition, and the gas valve 1, After opening 2 (18,20), attach a gas sensor inside gas inlet or gas pipe. The connection state of the gas detection sensor 26 is shown in FIG.

The signal input from the gas detection sensor 26 is input to the control microcomputer 24. The control microcomputer 24 senses an input gas movement state, and when gas starts to flow into a position where combustion can be successfully performed, a false circuit (ignition transformer signal terminal, flame detection signal terminal, and microcomputer explosion detection signal terminal) The output of the control signal that was input) is stopped and returned to the standby state so that the heating can be normally performed or the pre-purification stroke can be performed. Therefore, the second embodiment has an advantage of more accurately determining the ignition timing than the first embodiment.

According to the present invention as described above, there is an advantage that can easily discharge nitrogen and air for checking the airtightness in the gas pipe to improve the initial ignition time delay and inconvenience after installation of the product and provide a reliable product.

Claims (5)

In a gas heater that performs pre-purification and ignition strokes and burns gas for a predetermined time when a heating operation command is input, When the input of the air purge command is detected, a first step of generating a buzzer sound for warning, a second step of turning on the combustion motor to perform ventilation after the buzzer sound is generated, and outputting a control signal corresponding to the ignition transformer output signal. A third step of simulating the operation state of the ignition transformer, a fourth step of simulating a normal combustion state by outputting a control signal corresponding to a salt detection signal and a microcomputation detection signal, and supplying gas by turning on gas valves And a fifth step of stopping the operation after operating the combustion motor for a time (t). The method of claim 1, In the third step, a control signal corresponding to the ignition transformer output signal is output to simulate the operation state of the ignition transformer, and in the fourth step, a control signal corresponding to the flame detection signal and the microcomputer explosion detection signal is output to normal combustion state. An air purge method of a gas heater, characterized in that signals to be simulated are output from a control microcomputer. In a gas heater that performs pre-purification and ignition strokes and burns gas for a predetermined time when a heating operation command is input, When the input of the air purge command is detected, a first step of generating a buzzer sound for warning, a second step of turning on the combustion motor to perform ventilation after the buzzer sound is generated, and outputting a control signal corresponding to the ignition transformer output signal. A third step of simulating the operation state of the ignition transformer, a fourth step of simulating a normal combustion state by outputting a control signal corresponding to the salt detection signal and the microcomputation detection signal, and supplying gas by turning on the gas valves And a fifth step of stopping the operation after operating the combustion motor when detecting the movement state of the engine and detecting the movement to the optimum position for ignition. The method according to claim 1 or 3, And a function key for inputting the air purge command is further added to a function key installation part of the gas heater. The method of claim 3, The gas purge method of the gas heater characterized in that the gas detection sensor is installed in the gas inlet or gas pipe in order to detect the movement state of the gas in the fifth step, and transmits the detection state to the control microcomputer.