JP6809970B2 - Gas stove - Google Patents

Description

The present invention relates to a gas stove including a burner having a burner head exposed on a top plate.

Conventionally, in this type of gas stove, a flame detection element consisting of a thermoelectric pair facing a part of a large number of flame holes opened on the outer peripheral surface of the burner head is arranged so as to penetrate the top plate, and the burner misfires due to boiling spills or the like. When the flame detection element stops detecting the flame, the gas supply to the burner is stopped.

By the way, after washing the burner head with water, if the burner head is set on the burner body without wiping the water well, a part of the flame hole is sealed with water and the ventilation resistance increases, and at the time of ignition, the upstream end of the mixing pipe A part of the fuel gas injected from the gas nozzle toward the inflow port may overflow without entering the inflow port, and this fuel gas may flow under the top plate to the burner opening. Then, when the flame generated in the flame hole that is not sealed by the ignition of the burner is transferred to the fuel gas that has flowed to the opening for the burner, the fuel gas that leaks from the inflow port burns, that is, the flame blows from the inflow port. It will be ready to be put out.

Therefore, conventionally, a thermocouple is placed facing the inflow port, and when the thermocouple is heated by blowing out a flame from the inflow port and the electromotive voltage rises above a predetermined threshold value, gas is supplied to the burner. It is known that the device is stopped (see, for example, Patent Document 1).

However, in this case, a dedicated thermocouple for detecting the blowout of the flame from the inflow port is required separately from the flame detection element arranged so as to face the flame hole of the burner head, which increases the cost. Further, since the thermocouple is arranged so as to face the inlet, the thermocouple may hinder the intake of primary air into the inlet, which may adversely affect the combustibility of the burner.

Japanese Unexamined Patent Publication No. 2003-28428

In view of the above points, it is an object of the present invention to provide a gas stove capable of detecting a flame blown out from an inlet of a mixing pipe by a flame detecting element arranged so as to face the flame hole of the burner head. There is.

In order to solve the above problems, the present invention is a gas stove including a burner having a burner head exposed on a top plate, and a flame detection element facing a part of a large number of flame holes opened on the outer peripheral surface of the burner head. Is placed so as to penetrate the top plate, the combustion exhaust gas generated by the blowout of the flame from the inflow port at the upstream end of the mixing pipe of the burner is opened under the top plate at the penetration point of the flame detection element of the top plate. It is characterized in that a guide member is provided to guide the portion or the opening near the penetration portion of the flame detection element.

According to the present invention, when a flame is blown out from the inflow port at the upstream end of the mixing pipe, the combustion exhaust gas is guided to the guide member and the opening of the penetration portion of the flame detection element of the top plate or the penetration of the flame detection element. Reach the opening near the location. Then, the combustion exhaust gas rises through this opening, and the flame near the flame detection element becomes oxygen-deficient due to the influence of the combustion exhaust gas and lifts. As a result, the flame detection element does not detect the flame, and it is possible to detect the blowout of the flame from the inflow port. As described above, according to the present invention, since the flame detection element arranged so as to face the flame hole of the burner head can detect the blowout of the flame from the inflow port, the thermocouple facing the inflow port is not provided as in the conventional example. I'm done. Therefore, the intake of the primary air to the inflow port is not hindered and the combustibility of the burner is not adversely affected, and the cost can be reduced.

By the way, in order to improve the detection accuracy of the flame blown out from the inflow port, it is necessary to increase the opening of the penetration portion of the flame detection element of the top plate or the opening near the penetration portion of the flame detection element. Then, the spilled juice easily invades from the opening. Therefore, in the present invention, the shutter member is provided to close the opening of the penetration portion of the flame detection element of the top plate or the opening near the penetration portion of the flame detection element, and is opened by the shutter member when a certain time has passed after the burner ignition. It is desirable to close the part. According to this, even if the opening is enlarged in order to improve the detection accuracy of the flame blown out from the inflow port, it is possible to prevent the intrusion of the spilled juice from the opening.

The perspective view of the main part of the gas stove of embodiment of this invention. The cut side view cut by the line II-II of FIG. A perspective view of a main part in a state where the top plate of the gas stove of the embodiment is removed.

With reference to FIGS. 1 and 2, the gas stove according to the embodiment of the present invention includes a top plate 1 covering the upper surface of the stove body (not shown) and a burner 2. A burner opening 11 is provided on the top plate 1, and a raised portion 12 is formed above the peripheral edge of the burner opening 11. Then, the ring-shaped trivet frame of the trivet (not shown) is fitted onto the raised portion 12 so that the trivet is positioned on the top plate 1.

The burner 2 includes a mixing pipe 21 located under the top plate 1, a burner body 22 provided integrally with the mixing pipe 21 at the downstream end of the mixing pipe 21, and inserted into the burner opening 11 from below, and a burner body. It has a burner head 23 that is placed on the 22 and exposed on the top plate 1. The burner body 22 is fixed on a support base 3 fixed to the stove body. The gas nozzle 24 faces the inflow port 211 at the upstream end of the mixing pipe 21. Then, the fuel gas injected from the gas nozzle 24 and the primary air sucked from the inflow port 211 are mixed in the mixing pipe 21 to generate an air-fuel mixture, and this air-fuel mixture opens on the outer peripheral surface of the burner head 23. It is designed to be ejected from a large number of flame holes 231 and burned. Further, the burner body 22 and the burner head 23 are annular, and a pot bottom temperature sensor 4 that abuts on the bottom surface of the cooking container placed on the trivet and detects the temperature is arranged in the annular inner peripheral space. ..

Further, on the outside of a part of the burner head 23 in the circumferential direction, a thermocouple 5 which is a flame detecting element facing a part of the flame holes 231 and an ignition electrode 6 facing the target portion 232 extending from the burner head 23 are provided. They are arranged so as to penetrate the top plate 1 in a state of being arranged in the circumferential direction. Then, in a part of the circumferential direction of the burner opening 11, an opening 13 formed of a concave portion recessed outward in the radial direction, which is a penetration portion of the thermocouple 5, and a radial direction, which is a penetration portion of the ignition electrode 6. An opening 14 composed of a recessed portion recessed outward is formed, and the thermocouple 5 and the ignition electrode 6 are inserted through the openings 13 and 14 with a relatively large gap around the opening. I have to. The opening 14 also functions as an opening near the penetration portion of the thermocouple 5.

By the way, after washing the burner head 23 with water, if the burner head 23 is set on the burner body 22 without wiping the water well, a part of the flame hole 231 is sealed with water, and when the burner 2 is ignited, as described above. A flame may be blown out from the inflow port 211 of the mixing pipe 21. In this case, a thermocouple is placed facing the inflow port 211, and when the electromotive voltage of the thermocouple exceeds a predetermined level, it is determined that a flame has blown out from the inflow port 211, and the burner 2 is reached. It is also possible to stop the gas supply of. However, this increases the cost and may hinder the intake of primary air into the inflow port 211, which may adversely affect the combustibility of the burner 2.

Therefore, in the present embodiment, under the top plate 1, the combustion exhaust gas generated by blowing out the flame from the inflow port 211 is introduced into the opening 13 of the through portion of the thermocouple 5 of the top plate 1 and the opening of the through portion of the ignition electrode 6. A guide member 7 that leads to the portion 14 is provided. With reference to FIG. 3, the guide member 7 has a window hole 71a through which the burner body 22 is inserted, and a top plate portion 71 that covers the mixing pipe 21 from above over the space portion on the upstream side of the inflow port 211. It has a side plate portion 72 that is bent downward from the side edge of the upper plate portion 71, and an end plate portion 73 that is bent downward from the end edge of the upper plate portion 71 on the side where the window hole 71a is formed. The side plate portion 72 and the end plate portion 73 can prevent leakage from the bottom of the plate portion 71 to the side. Further, between the hole edge of the window hole 71a and the peripheral surface of the burner body 22, there is a gap 71b located near the arrangement portion of the thermocouple 5 and the ignition electrode 6 to allow the combustion exhaust gas to flow upward. It is secured.

According to this, the combustion exhaust gas generated by the blowout of the flame from the inflow port 211 travels under the upper plate portion 71, and the gap 71b secured between the hole edge of the window hole 71a and the peripheral surface of the burner body 22. It flows upward from and reaches the opening 13 of the through portion of the thermocouple 5 and the opening 14 of the through portion of the ignition electrode 6. Then, the combustion exhaust gas rises through these openings 13 and 14, and the flame in the vicinity of the thermocouple 5 becomes oxygen-deficient due to the influence of the combustion exhaust gas and lifts, so that the electromotive voltage of the thermocouple 5 decreases. Therefore, when the electromotive voltage of the thermocouple 5 is equal to or less than the predetermined threshold value when a predetermined time (for example, 10 seconds) has elapsed from the burner ignition, or when the rising gradient of the electromotive voltage from the burner ignition is equal to or less than the predetermined gradient. Can determine that the flame has blown out from the inflow port 211, and in this case, the safety can be ensured by stopping the gas supply to the burner 2.

As described above, according to the present embodiment, since the thermocouple 5 which is the flame detection element arranged so as to face the flame hole 231 of the burner head 23 can detect the blowout of the flame from the inflow port 211, the thermoelectric facing the inflow port 211 There is no need to make a pair. Therefore, the intake of the primary air to the inflow port 211 is not hindered and the combustibility of the burner 2 is not adversely affected, and the cost can be reduced.

By the way, in order to improve the detection accuracy of the flame blown out from the inflow port 211, it is necessary to increase the openings 13 and 14. However, if it is left as it is, when a spill occurs, the spilled juice easily invades through the openings 13 and 14.

Therefore, in the present embodiment, a shutter member 8 is provided below the openings 13 and 14 to close the openings 13 and 14 from below by moving upward. The shutter member 8 is moved up and down by the actuator 81. Further, the shutter member 8 is formed with holes 82 and 83 through which the thermocouple 5 and the ignition electrode 6 are inserted. The shutter member 8 may close the openings 13 and 14 by moving along the lower surface of the raised portion 12.

When the burner 2 is ignited, the shutter member 8 is moved downward as shown by the solid line in FIG. 2, and the openings 13 and 14 are opened. According to this, when a flame is blown out from the inflow port 211 of the mixing pipe 21 at the time of ignition, the flame rises from the gap 71b between the hole edge of the window hole 71a of the guide member 7 and the peripheral surface of the burner body 22. The combustion exhaust gas bypasses the outside of the shutter member 8 and reaches the openings 13 and 14 as shown by the arrow a in FIG. After a certain period of time (for example, 60 seconds) has elapsed after ignition, the shutter member 8 is moved upward as shown by a virtual line in FIG. 2 to close the openings 13 and 14. This makes it possible to prevent the intrusion of spilled juice from the openings 13 and 14. It should be noted that the flame does not blow out from the inflow port 211 only after a certain time has passed after ignition. Therefore, there is no problem even if the openings 13 and 14 are closed after a certain period of time has passed after ignition.

Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, the thermocouple 5 is used as the flame detection element, but a frame rod may be used. Further, in the above embodiment, the opening 13 of the through portion of the flame detection element of the top plate 1 is continuous with the burner opening 11, but the opening 13 may be formed by a hole independent of the burner opening 11. It is possible. Further, the flame detection element is fitted into the opening of the penetration portion of the flame detection element with almost no gap, the top plate 1 is provided with an opening located near the penetration portion of the flame detection element, and the inflow port 211 is provided in this opening. The guide member may be configured to guide the combustion exhaust gas generated by the blowout of the flame from.

Further, in the above embodiment, the guide member 7 has an upper plate portion 71 that covers the mixing pipe 21 from above, but a lower plate portion and a lower plate portion located below the mixing pipe 21 and the burner body 22. It is also possible to have a side plate portion that bends upward from the side edge of the top plate 1 and abuts on the lower surface of the top plate 1. Further, the top plate 1 is composed of another glass top plate main body and a burner ring corresponding to the raised portion 12 of the above embodiment, which is placed on the top plate main body, and the flame detection element penetrates the burner ring. An opening at the location or an opening near the penetration portion of the flame detection element may be formed.

1 ... Top plate, 13 ... Opening of the penetration point of the thermocouple (flame detection element), 2 ... Burner, 21 ... Mixing pipe, 211 ... Inflow port, 23 ... Burner head, 231 ... Flame hole, 5 ... Thermocouple ( Flame detection element), 7 ... guide member, 8 ... shutter member.

Claims (2)

In a gas stove having a burner having a burner head exposed on the top plate, a flame detection element facing a part of a large number of flame holes opened on the outer peripheral surface of the burner head is arranged so as to penetrate the top plate. ,
Under the top plate, the combustion exhaust gas generated by the blowout of flame from the inlet at the upstream end of the mixing pipe of the burner is applied to the opening of the penetration point of the flame detection element of the top plate or the opening near the penetration point of the flame detection element. A gas stove characterized by being provided with a guiding guide member. The gas stove according to claim 1, further comprising a shutter member that closes the opening, and the opening is closed by the shutter member when a certain time has passed after ignition of the burner.

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