KR960010797B1 - Flash back safety device for gas-combustor - Google Patents

Abstract

The back fire safety device is designed to prevent explosion of a gas storage tank and burning out of its parts. The safety device includes : a gas outlet tube (20) connected to a burner (14) and sending the gas passed through a gas inlet tube (18); a safety valve (26) for opening and closing a gas nozzle (24) located in the gas inlet tube (18); and a flame nozzle (36) for discharging the flame outwards when a back fire is generated.

Description

Flashback safety device for gas burner

1 is a cross-sectional view showing the structure of a conventional flashback safety device applied to a gas combustion device.

2 is an exploded perspective view of a flashback safety device for a gas combustion device according to the present invention.

3 is a cross-sectional view of the coupling state of FIG.

4 is a cross-sectional view showing the operating state of the flashback safety device of the gas combustion device according to the present invention.

* Explanation of symbols for main parts of the drawings

18: gas inlet pipe 20: gas outlet pipe

26: safety valve 36: flame outlet

42: flashback detection means 46: the first solenoid

50: second solenoid 52: transparent piping

54: detection sensor 56: controller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flashback safety device for a gas combustion device, and more particularly, in a combustion device using gas as a fuel, installed on a gas flow path between a gas storage tank (or gas generator) and a burner. When backfire occurs, it detects the flame and automatically shut off the gas supply before the flame arrives at the explosion location, and automatically open the flame outlet to prevent explosion of the gas storage tank. It is related with the flashback safety device of the gas combustion device which can prevent the burning of fire.

In general, in a gas combustion device that receives gas from a gas storage tank such as a gas welder or a gas furnace and burns the gas in a burner, the gas is supplied to the burner due to a failure of the gas storage tank or the gas generator during operation. When the pressure of the gas is lowered below a certain value, there is a problem that the gas storage tank may be exploded because a backfire phenomenon is propagated to the gas storage tank against the gas supply pipe connected with the flame generated from the burner.

Accordingly, the gas combustion device 10, which is supplied with gas from the separate gas storage tank and combusted in the burner, is disposed between the gas storage tank 12 and the burner 14, as shown in FIG. On the corresponding gas supply path, the gas inlet pipe (18) connected by the gas storage tank 12 and the gas supply pipe 16 to receive the gas supplied from the gas storage tank 12, and the front end is The gas inlet pipe (18) is fitted to the rear end is coupled, the rear end of the gas passed through the gas inlet pipe 18 in the state connected by the burner 14 and the gas supply pipe (16 ') burner (14) The gas outlet pipe 20 to be sent to the gas storage pipe 12 is fitted in a state of coalescing by the spring 22 that always acts in the forward direction inside the coupling portion of the gas inlet pipe 10 and the gas outlet pipe 20. By the pressure of the gas supplied during normal gas supply from To open the gaseous outlet hole 24 formed in the gas inlet pipe 18, and when the backfire occurs from the burner 14, the gaseous outlet hole 24 is pushed forward by the pressure accompanying the flashback. The safety valve 26 and the gas outlet pipe 20 are closed to communicate with the interior of the gas outlet pipe 20 at a predetermined position on the upper surface of the gas outlet pipe 20. The radial flame ejection hole 28 is formed, and in the through hole 30 communicating with the gas outlet pipe 20, when the gas is normally installed in a state of being coaleded by a spring 32 acting downward, By the action of the spring 32 is pulled downward, and when the backfire occurs from the burner 14 to the flame ejection opening 36 is provided with a through-opening valve 34 is pushed upward by the backfire input accompanying it. Flashback Prevention (38) is installed so that the above-mentioned safety valve 26 automatically blocks the gas inlet and outgassing holes 24 inside and outside the gas inlet pipe 18 so that the gas supply can be shut off when the backfire occurs. Open through-opening valve 34 of the flame ejection opening 36 protruded to the flame to be discharged to the outside through the flame ejection opening 28 of the flame ejection opening (36).

However, in the flashback safety device of the conventional gas burner, the flame generated from the burner 14 propagates in the reverse direction against the gas supply pipe 16 'and explodes inside the gas outlet pipe 20. At this time, the safety valve (26) When the elasticity of the spring 22 holding the 26 is unable to close the gas outlet hole 24, the explosion flame propagates through the gas inlet pipe 18 to the gas storage tank 12 and is chained. There was a problem that there is a high risk of explosion.

In addition, the gas outlet pipe 20 is damaged during the parts such as the through-opening valve 34 and the spring 32 made of rubber due to the strong heat and pressure generated during the explosion, so that it is impossible to reuse and is always solid after being backfired. There was a problem that should be.

The present invention is to solve such a conventional problem, in a gas combustion device configured to receive the fuel gas from the gas storage tank and to burn in the burner at a predetermined position on the gas movement path when the backfire occurs due to the pressure drop of the supply gas It detects backfire and converts it into an electrical signal so that the gas flow from the gas storage tank is automatically shut off by blocking gaseous openings in the gas inlet pipe before the backfire reaches the gas outflow point. The purpose is to provide a new type of flame retardant safety device for gas-fired combustion equipment that automatically opens the flame outlets connected to the outlet pipes to prevent the explosion of gas storage tanks in advance and to prevent damage to parts. There is this.

In order to achieve the above object, the present invention, the gas inlet pipe connected to the gas storage tank for receiving the gas, the front end is coupled to the gas inlet pipe, the rear end is connected to the burner by the gas supply pipe to the gas A gas outlet pipe for passing the gas passing through the inlet pipe to the burner, and a safety valve for opening and closing the gas discharge hole formed in the gas inlet pipe in a state in which the gas inlet pipe and the gas outlet pipe are installed by a spring; A flame retardant safety device for a gas fired combustion apparatus comprising a flame ejection outlet coupled to communicate with an inside of the gas outlet pipe at a predetermined position on an upper surface of the gas outlet pipe to discharge the flame to the outside when a flashback occurs. And the other end is installed at a predetermined position on the gas supply pipe combined with the burner to detect the flame propagating backward from the burner. Is connected to the flashback detection means and the flashback detection means, and the tip of the operating rod is coupled with the tip of the safety valve installed inside the gas inlet pipe to pull the safety valve upon application of the flashback generation signal from the flashback detection means. A first solenoid that automatically closes the gas outlet, and is electrically connected to the flashback detection means, and when the flashback generation signal from the flashback escape means is applied when the operating rod is coupled with a through-opening valve inside the flame outlet. The second solenoid is configured to automatically open the through hole by pulling the through hole valve outward.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 and 3 are respectively an exploded perspective view of the flashback safety device of the gas combustion device according to the present invention and a cross-sectional view of the combined state thereof. The flashback safety device 40 of the present invention is fitted at one end by screwing into the gas outlet pipe 20, and the other end is installed at a predetermined position on the gas supply pipe 16 'coupled with the burner 14. And a flashback detecting means 42 which detects a flame generated from the burner 14 and propagates in the reverse direction against the gas supply pipe 16 ', and is electrically connected to the flashback detecting means 42. ) Is coupled to the front end of the safety valve 26 installed inside the gas inlet pipe 18, when the backfire detection signal is applied from the backfire detection means 42, the safety valve 26 is pulled out to generate gas. A first solenoid 46 for automatically closing the ball 2 and the back light detecting means 42 are also electrically connected to each other, and an operating rod 44 ′ is provided with a through-opening valve in the flame outlet 36. 48 is applied when the backfire generation signal from the backfire detection means 42 To automatically open to the public through the pulmonary valve 48 indicates that the configuration with the second solenoid (50).

In the flashback safety device 40 of the gas burner according to the present invention, the flashback detecting means 42 is separately coupled to the gas supply pipe 16 ′ separated by a predetermined distance from the burner 14 of the gas burner 10. The transparent pipe 52 is installed to be wrapped around the outer circumference of the transparent pipe 52, the dark room is formed inside the sensing sensor to detect the flame passing through the transparent pipe 52 when the backfire occurs ( 54 and the flame signal detected by the sensor 54 in the state of being electrically connected to the sensor 54, converts the flame signal into an electrical signal, coupled to the operating rod 44 as the first solenoid 46 Signal to operate in the direction of closing the safety valve 26, the second solenoid 50 opens the through-opening valve 48 inside the flame spout 36 coupled with the operating rod 44 ' Consists of a controller 56 which sends a signal to actuate in the giving direction The.

On the other hand, in the present invention, the first solenoid 46 is wound around the outer housing 58 and the cylindrical housing 58, which is fitted and coupled to the outer side of the front end of the gas inlet pipe 18, a separate power source And a coil 60 in which a current flows in a forward or reverse direction according to a signal from the controller 56, and is inserted into the housing 58, and an operating rod 44 is coupled to the front thereof. In the state is made of a magnet 62 to move back and forth in a straight line according to the current flow direction of the coil (60).

In the first solenoid 46, the rear side of the housing 58 is inserted into a separate adjusting iron core 64 for adjusting the force of the magnetic force line by screwing.

On the other hand, in the present invention, the second solenoid 50 is installed in a form covered by the case 66 at a predetermined height of the flame ejection opening 36, and has a conventional structure.

Meanwhile, in the present invention, the gas supply pipe 16 'interconnecting the gas outlet pipe 20 and the burner 14 has a spiral shape corresponding to a predetermined distance in front of the installation part of the flashback detection means 42. It is configured to be configured to delay the propagation speed of the flame directed to the gas outlet pipe 20 when backfired.

The operation of the present invention made as described above is as follows.

In a state in which a normal gas supply is made, as shown in FIG. 3, as the gas is discharged from the gas storage tank 12 at a constant pressure, a safety valve that blocks the gaseous discharge hole 24 inside the gas inlet pipe 18 ( 26 is opened, the through-hole 30 inside the flame outlet 36 formed on the gas outlet pipe 20 is kept closed by the through-opening valve 487 so that the gas is discharged from the gas outlet pipe 20. It is supplied to the burner 14 through the combustion furnace and burned.

When the gas supply pressure is lowered due to an abnormality or other cause of the gas combustion device 10 from such a steady state, the flame generated from the burner 14 propagates in the reverse direction across the gas supply pipe 16 '. In this state, as shown in FIG. 4, when the flame propagates from the burner 14 in the reverse direction of the gas supply direction passes through the transparent pipe 52 constituting the flashback detecting means 42, it is detected. The flame is sensed by the sensor 54, and the flame signal thus detected is converted into an electrical signal by the controller 56 and applied to the first solenoid 46 and the second solenoid 50.

When the electrical signal is transmitted from the controller 56 to the first solenoid 46 in this manner, current flows in a predetermined direction to the coil 60 wound on the outer circumference of the housing 58, and the magnet 62 is closed at the rear end 64. The safety valve 36 coupled with the operating rod 44 is pulled toward the gas outlet pipe 24 while overcoming the force of the spring 22, thereby preventing the gas from flowing into the gas outlet pipe 20. .

At the same time, when the electrical signal is transmitted from the controller 56 to the second solenoid 50, the through-opening closing valve 48 closing the through-hole 30 of the flame ejection opening 36 is operated by the operating rod 44 '. The outside of the through hole 30 is opened while being moved outward by the action of pulling outward.

In this way, the gaseous outflow hole 24 inside the gas inflow pipe 18 is closed, and the flame propagated against the gas supply pipe 16 'while the through hole 30 on the gas outflow pipe 20 is open. Delayed by the helical portion of the gas supply pipe 16 ', the gas outlet pipe 20 reaches the gas outlet pipe 20, and is ignited and exploded by the thinned gas in the gas outlet pipe 20. The flame generated at this time is generated inside the flame outlet 36. It is discharged to the outside through the through hole (30).

When the flashback is completed in this way, there is no signal applied from the controller 56 to the first and second solenoids 46 and 50 as the flame in the transparent pipe 52 constituting the flashback detecting means 42 disappears. Thus, the safety valve 26 and the through-opening valve 48 are returned to their original state, and normal gas supply and combustion operations are performed again.

According to the present invention, the flame propagated from the burner against the gas supply pipe is pre-detected by the flashback detecting means and converted into an electrical signal, and the gas is introduced before the flame reaches the gas outlet pipe at the explosion position by the electrical signal. The safety valve inside the pipe is automatically closed, and the through-opening and closing valve in the flame outlet is automatically opened so that the flame can be discharged efficiently without being propagated to the gas storage tank in the event of an explosion inside the gas outlet pipe. In addition, there is an effect that can prevent the explosion of the gas storage tank, and there is no effect of burnout of the components due to the explosion, it is possible to use continuously without replacing the device itself whenever the flashback occurs.

Claims (3)

Gas inlet pipe (18) connected to the gas storage tank (12) to receive gas, and the front end is coupled to the gas inlet pipe (18), the rear end is burner (by separate gas supply pipe (16 ') 14 is connected to the gas outlet pipe 20 which passes the gas inlet pipe 18 and passes through the gas inlet pipe 18 to the burner 14, and inside the coupling portion of the gas inlet pipe 18 and the gas outlet pipe 20. A safety valve 26 for opening and closing the gas discharge hole 24 formed in the gas inlet pipe 18 in a state of being coaleded by the spring 22 and the gas outlet at a predetermined position on the upper surface of the gas outlet pipe 20. In the flashback safety device for a gas combustion device, which is coupled to communicate with the inside of the pipe 20 and discharges the flame to the outside when the backfire occurs, one end is coupled to the gas outlet pipe 20, The other end is installed at a predetermined position on the gas supply pipe 16 'coupled with the burner 14, and is reversed from the burner 145. Flashback detection means 42 for detecting the propagation of the flame, and electrically connected to the flashback detection means 42, the tip of the operating rod 44 of the safety valve 26 installed in the gas inlet pipe 18 A first solenoid 46 coupled to the front end to automatically close the gaseous exit hole 24 by pulling the safety valve 26 upon application of the backfire signal from the backfire detection means 42 and the backfire detection means; (42) is electrically connected, and when the operating rod (44 ') is coupled with the through-opening closing valve (48) inside the flame outlet (36) when the flashback generation signal from the flashback detecting means (42) Flashing safety device for a gas combustion device, characterized in that consisting of a second solenoid (50) for automatically opening the through-hole (30) by pulling the through-hole valve (48) outward. 2. The transparent flame detector (52) according to claim 1, wherein the flashback detecting means (42) is separately coupled to the gas supply pipe (16 ') separated by a predetermined distance from the burner (14) of the gas combustion device (10), and the transparent It is installed to be wrapped around the outer periphery of the pipe 52, the interior of the dark chamber is formed to detect the flame passing through the transparent pipe 52 when the backfire occurs, and the detection sensor 54 Direction of closing the safety valve 26 coupled with the operating rod 44 with the first solenoid 46 by converting the flame signal detected by the detection sensor 54 into an electrical signal in an electrically connected state with Controller to send the signal to the second solenoid (50) to operate in the direction to open the through-opening valve 48 inside the flame spout 36 to which the operating rod 44 'is coupled ( 56) of the gas combustion device, characterized in that consisting of Flashback safety device. The gas supply pipe 16 ', which connects the gas outlet pipe 20 and the burner 14 to each other, has a spiral shape in front of the installation part of the flashback detecting means 42. Flashback safety device for a gas combustion device, characterized in that to form a delay to propagate the flame propagation speed of the flame.