JPS6026276Y2 - Gas burner control device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control device for a gas burner, particularly when a control valve is provided in the middle of a fuel gas supply line to shut off when the fuel gas flow rate becomes larger than a set value. The present invention relates to a control device.

The prior art will be explained with reference to FIG.

A control valve 3, an on-off valve 4, a solenoid valve 5, and a governor 6, which close when gas flows at a flow rate higher than a set flow rate, are installed in the middle of a pipe line 2 for supplying fuel gas, such as city gas, to the gas burner 1 from upstream. They are prepared in order.

When igniting the gas burner 1, the on-off valve 4 and the electromagnetic valve 5 are opened, and combustion of the gas burner 1 is started by an ignition source (not shown).

At the start of this combustion, the secondary pressure of the governor 6 is approximately equal to atmospheric pressure, so the on-off valve 4 and the solenoid valve 5
When the valve is opened, it is unavoidable that fuel gas exceeding the set value temporarily flows into the gas burner 1.

Therefore, when the fuel gas exceeding the set value flows, the control valve 3 may close, and ignition of the gas burner 1 may be prevented.

An object of the present invention is to provide a control device that solves the above-mentioned technical problems and can smoothly ignite a gas burner by preventing the control valve from closing during ignition.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a system diagram of an embodiment of the present invention. This gas burner 10 is used, for example, as a heat source for a hot air heater 15, and is ignited by an ignition means (not shown) without using a pilot burner.

In the middle of the pipe line 11 that supplies fuel gas to the gas burner 10, control valves 1 that are shut off when the fuel gas flow rate becomes lower than a set value are installed in order from the upstream side, similar to the prior art shown in FIG.
2, an on-off valve 13 and a governor 14 are provided.

Note that the control valve 12 is provided outside the hot air heater 15.

In the middle of the pipe line 11, an on-off valve 13 and a governor 14 are installed.
A first solenoid valve 16 as a first opening/closing control valve is provided between them.

Further, a second solenoid valve 17 as a second opening/closing control valve is provided downstream of the governor 14 .

A bypass line 18 is provided by short-circuiting the upstream and downstream sides of the second electromagnetic valve 17, and a throttle 19 is provided in the middle of this bypass line 18.

Note that the throttle 19 may be omitted and the inner diameter of the bypass conduit 18 may be made small to provide the same flow resistance as the throttle 19.

The first solenoid valve 16 and the second solenoid valve 17 are controlled by the control means 20
are connected to each.

This control means 20 controls the first
It has a control function of opening the second solenoid valve 17 after a predetermined period of time has elapsed after opening the solenoid valve 16 .

In order to operate the hot air heater 15, a push button (not shown) may be pressed while the on-off valve 13 is opened.

As a result, a blower (not shown) and the like are driven, and the first electromagnetic valve 16 is opened by the action of the control means 20.

At this time, the second solenoid valve 17 also remains closed.

In response to the opening of the first solenoid valve 16, the fuel gas is transferred to the governor 14.
The gas is supplied to the gas burner 10 via the bypass line 18.

At this time, since the bypass pipe line 18 is equipped with a throttle 19, the flow rate of the fuel gas is limited and small even though the opening degree of the governor 14 is large, and therefore the control valve 12 is The valve remains open.

In the gas burner 10, the small flow rate of the fuel gas is ignited by an ignition means (not shown), and combustion is started.

After a predetermined period of time has elapsed since the first solenoid valve 16 opened, the second solenoid valve 1
7 opens, thereby supplying a predetermined amount of fuel gas to the gas burner 10.

When the second electromagnetic valve is opened, a small amount of fuel gas is already flowing, so that no amount of fuel gas exceeding the set value will flow through the governor 14.

In this way, by opening the second solenoid valve 17 after a certain period of time has elapsed after the opening of the first solenoid valve 16, a large amount of fuel gas exceeding the set value can temporarily flow when the gas burner 10 is ignited. Therefore, the control valve 12 can be prevented from closing, and the gas burner 10 can be ignited smoothly.

As another embodiment of the present invention, the first solenoid valve 16 and the second solenoid valve 16
Full combustion operation state with the solenoid valve 17 open and the first solenoid valve 1
In a warm air heater that can freely switch between a semi-combustion operating state in which valve 6 is opened and the second solenoid valve 17 is closed, and an operating suspension state in which both electromagnetic valves 16 and 17 are closed, When switching to the full combustion operating state, the second solenoid valve 17 may be opened after a certain period of time has elapsed since the first solenoid valve 16 was opened.

As yet another embodiment of the present invention, in a hot air heater in which the on-off valve 13 is kept open at all times and the operation is started at a preset time using a timer etc., the first solenoid valve 16
The second electromagnetic valve 17 may be opened after a certain period of time has passed after the valve is opened.

Although each of the above-mentioned embodiments has been described in connection with a hot air heater, the present invention is not limited to a hot air heater, but can be widely implemented in connection with a gas combustion device.

As described above, according to the present invention, the first on-off control valve and the second on-off control valve are provided in the middle of the pipe line that supplies fuel gas to the gas burner, and a bypass line for the second on-off control valve is provided, so that the gas burner can be ignited. Since the second on-off control valve is opened when a predetermined period of time has elapsed after the first on-off control valve was opened, a large amount of fuel gas exceeding the set value temporarily flows when the gas burner is ignited. This prevents the gas burner from igniting smoothly.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of the prior art, and FIG. 2 is a system diagram of an embodiment of the present invention. 10...Gas burner, 11...Pipe line,
12... Control valve, 14... Governor, 1
6...First solenoid valve, 17...Second solenoid valve, 18...Bypass pipe line, 19...
Aperture, 20... Control means.

Claims (1)

[Scope of Claim for Utility Model Registration] A control valve that closes when a flow rate of fuel gas exceeding a set flow rate flows in a pipe line that supplies fuel gas to a gas burner, and a control valve that controls the supply pressure of fuel gas to the gas burner. is a control device for a svarna, which includes a governor and a governor in order from the upstream side, comprising: a first opening/closing control valve which is provided between the control valve and the governor in the middle of the supply pipe line and whose opening/closing is controlled; A second on-off control valve is provided on the downstream side of the first on-off control valve and is controlled to open/close, and the upstream and downstream sides of the second on-off control valve are short-circuited to allow only a limited flow rate of fuel gas. Bypass conduit, which allows
and controls the opening/closing operations of the first opening/closing control valve and the second opening/closing control valve.The first opening/closing control valve opens when the gas burner is ignited, and after a predetermined period of time has elapsed, the second opening/closing control valve opens. A control device for a gas burner, comprising a control means.