JPH0227322Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a primary air control device for a gas stove or other gas combustor for cooking.

The applicant of this application previously proposed a gas control device for this type of gas combustor, for example, in Japanese Patent Application No. 58-145758.
(Japanese Patent Application Laid-Open No. 60-38525), a gas nozzle faces the gas intake port of the gas burner, and the gas burner is connected to a type that sucks primary air from the primary air supply port using the gas jet force from the gas nozzle. On the upstream side of the gas passage, there is provided an on-off control valve that opens and closes when a first operating member is operated to control the operation of the igniter, and on the downstream side thereof, an on-off control valve that is opened and closed is controlled by a second operating member to at least reduce the amount of gas. A flow rate control valve that can freely adjust the flow rate, a medium flow rate, and a large flow rate is provided, and the flow rate control valve is configured to temporarily adjust the gas amount by operating the first operating member, at least in the small flow state of the gas amount. We have proposed a type in which the flow rate control valve is operated on the increasing side, but considering the case where the first operating member is operated with the flow rate control valve in a small flow rate state of the gas amount, The flow rate control valve is once operated to increase the amount of gas, and the gas burner can obtain good ignition when the amount of gas is increased, but next, when the first operating member is released, the flow rate control valve is operated to increase the amount of gas. The gas amount returns to a small flow rate state, and the gas burner thus has the disadvantage of being prone to accidental misfire. That is, in the seed gas burner, suction of primary air is performed by ejecting gas from a gas nozzle, and when the amount of gas is large, the amount of primary air is correspondingly large, and when the amount of gas is small, the amount of primary air is also small. However, immediately after increasing the gas amount by operating the first operating member and then releasing the operation to return the gas amount to a small flow rate state, the primary air amount cannot be reduced immediately and a large amount of primary air is sucked in, causing an accidental misfire.

The purpose of the present invention is to obtain a device free of such inconveniences, and the gas nozzle 2d is placed facing the gas intake port 1a of the gas burner 1, and the gas jetting force from the gas nozzle 2d is used to draw air from the primary air supply port. A gas passage 2 connected to a gas burner 1 that sucks primary air is connected in series with an open/close control valve 5 and a flow rate control valve 7 that can freely adjust the gas amount into at least three stages: small flow rate, medium flow rate, and large flow rate. The opening/closing control valve 5 and the flow rate control valve 7 are controlled to open and close by separate operating members, and the flow rate control valve 7 is operated as an opening/closing control valve at least in the small flow rate state of the gas amount. The gas burner is once operated to increase the amount of gas in response to the opening operation of the on-off control valve 5, and the igniter 3 is operated in conjunction with the opening operation of the on-off control valve 5. The primary air supply port 8 of 1 is provided with a restricting member 9 that operates to reduce the amount of air in a small gas flow state in conjunction with the opening/closing control operation of the flow rate control valve 7. In this case, the opening operation of the on-off control valve 5 is performed by the first operating member 4, and the opening/closing control of the flow rate control valve 7 is performed by the second operating member 4.
The first operating member 4 is configured as a push button, and when the first operating member 4 is pressed, the opening/closing control valve 5 opens and the electromagnetic safety valve 5a in front of the opening/closing control valve 5 is operated to the opening side. Then, when the pressure is released, the member 4 once returns to the intermediate position and leaves the electromagnetic safety valve 5a, but with the on-off valve 5 open, it is locked by a locking mechanism (not shown) and then moves to its side. The third operating member 4a on the other hand is constructed in the form of a push button, and when pressed, the third operating member 4a is released from its lock and returned to its initial position.

Further, the second operating member 6 is configured as a lever type that can be tilted left and right, and the flow rate control valve 7 is configured to open and close the first passage 2a and the second passage 2b which are parallel to each other. a first control valve 7a that opens and closes the
and a second control valve 7b that opens and closes the second passage 2b.If the second operating member 6 is placed at the right end position in the drawing, both control valves 7a and 7b are closed, and the third passage 2b is opened and closed.
A small flow rate state is obtained in which only the control valve c is opened.Next, if the member 6 is set at the intermediate position, the second control valve 7b is opened and a middle flow state is obtained.If the member 6 is set at the left end position, the first control valve 7b is opened. Valve 7a was also opened to obtain a large flow rate. Further, when the first control valve 7a is operated in the closed state, the first control valve 7a is pushed by the first control valve 7a and opens once to increase the amount of gas. is provided with a pressing member 4b that presses the first control valve 7a to open it.

The above is not particularly different from what was proposed earlier, but
According to the present invention, as described above, the primary air supply port 8 of the burner 1 is provided with a limiting member 9 that operates to limit the air amount when the gas amount is small. 1 and 2, it consists of a main damper 10 on the front side of the supply port 8 and an auxiliary damper on the front side thereof that overlaps with it, and the auxiliary damper 9 has the aforementioned second operating member in its upper locking hole 9a. When the gas flow rate is small, the member 6 is engaged with the automatic arm 6a extending from the member 6, and the member 6 is rotated to the left as shown in FIG. When the valve 6 is activated and the gas flow rate is large, the valve 6 can be rotated to the right as shown in FIG. More specifically, the auxiliary damper 9 has a pair of left and right through holes 9b, which cooperate with a pair of left and right openings 10a, 10a of the main damper 10 on its back side.

As clearly shown in FIGS. 5 and 6, for example, the auxiliary damper 9 is pivoted so as to be tiltable to the left and right, and is always on the open side by a spring 9c. In the small flow rate state, the primary air supply port 8 is closed and the airflow is reduced, thus preventing the above-mentioned accidental misfire when the supply port 8 is opened. That is, the burner 1 operates with a relatively small amount of primary air introduced from the beginning, and when the primary air is introduced in a relatively large amount, the above-mentioned accidental misfire does not occur.

In this way, according to the present invention, the gas nozzle 2d faces the gas intake port 1a of the gas burner 1, and the primary air supply port of the gas burner 1 is configured to suck primary air from the primary air supply port using the gas jet force from the gas nozzle 2d. A flow control valve 7 is connected to the air supply port 8.
A restricting member 9 is provided which operates to reduce the amount of air in the low gas flow state in conjunction with the opening/closing control of Since the amount of primary air sucked is limited by the gas jetting force from the gas nozzle 2b, when the increased amount of gas at ignition becomes a small flow rate immediately after ignition, the amount of air becomes excessive compared to the amount of gas. This has the effect of ultimately preventing misfires that occur during ignition.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of an example of a gas combustor equipped with the device of the present invention, Fig. 2 is a perspective view of its main parts, and Figs. 3 and 4 are diagrams explaining the operation of the limiting member. , FIG. 5, and FIG. 6 are operation explanatory diagrams of the modified examples. DESCRIPTION OF SYMBOLS 1... Gas burner, 2... Gas passage, 3... Igniter, 4... First operating member, 5... Opening/closing control valve,
6... Second operating member, 7... Flow rate control valve, 8...
Primary air supply port, 9...limiting member (auxiliary damper).

Claims (1)

[Scope of utility model registration request] Gas nozzle 2 is installed in the gas intake port 1a of the gas burner 1.
An on-off control valve 5 is connected in series to a gas passage 2 leading to a gas burner 1 of a type that faces the gas nozzle 2d and suctions primary air from a primary air supply port using the gas jet force from the gas nozzle 2d. Flow rate control valves 7 that can be adjusted freely are provided in three stages of small flow rate, medium flow rate, and large flow rate, and these open/close control valves 5 and flow rate control valves 7
are controlled to open and close by separate operation members, and furthermore, when the flow rate control valve 7 is at least in a small flow rate state of the gas amount, the amount of the gas is temporarily increased with the opening operation of the on-off control valve 5. In the case where the igniter 3 is operated in conjunction with the opening operation of the on-off control valve 5, the flow rate control valve 7 is connected to the primary air supply port 8 of the gas burner 1.
A restriction member 9 that operates to reduce the amount of air in a small gas flow state in conjunction with the opening/closing control operation of
A primary air control device in a gas combustor comprising: