JP4246770B2 - Stove burner - Google Patents

Description

  The present invention relates to a stove burner capable of adjusting the heating power over a wide range from a strong fire to a hot fire.

  Conventionally, as a stove burner of this type, a large number of upper and lower two-stage flame holes are provided on the circumferential surface of the burner head with circumferential intervals, and different paths are provided to the upper and lower flame holes. Is known in which the air-fuel mixture is supplied and the total area of the lower flame holes is smaller than the total area of the upper flame holes (see, for example, Patent Document 1). According to this burner, it is possible to vary the heating power over a wide range from a strong fire state in which combustion is performed in both the upper flame hole and the lower flame hole to a fire condition when combustion is performed only in the lower flame hole.

  Further, in this burner, a thermocouple serving as a flame detection element for detecting a flame in the lower flame hole is disposed adjacent to a spark plug for igniting the lower flame hole. Then, when the burner is ignited, the lower flame hole is ignited by the spark plug with the air-fuel mixture supplied to both the upper flame hole and the lower flame hole, and the flame is transferred from the lower flame hole to the upper flame hole for ignition. ing. Further, an electromagnetic safety valve provided in a fuel gas passage common to the upper flame hole and the lower flame hole is held open by an electromotive force of a thermocouple so that the electromagnetic safety valve is closed in the event of a misfire.

By the way, at the time of ignition operation, an air-fuel mixture having a combustible concentration is not ejected from each flame hole until the extrusion (air purge) of air from the air-fuel mixture supply path for each flame hole is completed. Here, since the lower flame hole has a smaller total area than the upper flame hole and the amount of air-fuel mixture supplied is small, the time required for air purging of the air-fuel mixture supply path for the lower flame hole is the air-fuel supply for the upper flame hole. It tends to be longer than the time required for the air purge of the route. Therefore, before the air-fuel mixture having a combustible concentration is ejected from the lower flame hole and ignited, the air-fuel mixture having a combustible concentration may be ejected from the upper flame hole. As a result, when the lower flame hole is ignited, the air-fuel mixture previously ejected from the upper flame hole is ignited to generate a large flame, which may surprise the user.
JP-A-9-303719

  In view of the above, the present invention provides a stove burner capable of performing smooth ignition without generating a large flame despite having two upper and lower flame holes. It is said.

  In the present invention, a large number of upper and lower two-stage flame holes are provided on the circumferential surface of the burner head at intervals in the circumferential direction, and an air-fuel mixture is supplied to the upper and lower flame holes through different paths. In addition, in a stove burner in which the total area of the lower flame hole is smaller than the total area of the upper flame hole, in order to solve the above problem, the spark plug for igniting the lower flame hole, and the arrangement position of the spark plug And a flame detection element that detects the flame of the lower flame hole at a position opposite to the circumferential direction of the burner head, and when the burner is ignited, the air-fuel mixture is supplied only to the lower flame hole and the lower flame hole is opened by the spark plug. Ignition is performed, and supply of the air-fuel mixture to the upper flame hole is started when the flame detection element detects the flame.

  According to the present invention, even if it takes time to purge air from the mixture supply path for the lower flame hole, the lower flame hole is ignited without supplying the mixture to the upper flame hole. There is no flame. In addition, since the flame detection element is located on the opposite side of the burner head in the circumferential direction from the position of the ignition plug, when the flame detection element detects a flame, the flame detection element is in a state where it has been transferred to the lower flame hole almost all around the burner head. Become. In this state, supply of the air-fuel mixture to the upper flame hole is started, so that smooth fire transfer from the lower flame hole to the upper flame hole is performed over the entire circumference of the burner head.

  In the present invention, it is desirable to start supplying the air-fuel mixture to the upper flame hole after the notification means is activated when the flame detection element detects a flame. According to this, even if the fire suddenly becomes a high fire state due to the transfer to the upper flame hole, the user can know in advance that a strong fire state will be caused by the operation of the notification means. Therefore, the user is not surprised by a sudden change to a high fire condition.

  With reference to FIG. 1, 1 is a stove body, 2 is a top plate that covers the upper surface of the stove body 1, and 3 is a burner for the stove. The top plate 2 is provided with a burner opening 2a. On the top plate 2, five virtues (not shown) are placed so as to surround the burner opening 2 a. Then, the cooking container placed on the five virtues is heated by the burner 3.

  The burner 3 includes a burner head 4 exposed on the top plate 2. On the peripheral surface of the burner head 4, as shown in FIG. 2, a plurality of upper and lower two-stage flame holes 5U and 5L are provided with a circumferential interval therebetween. Here, the upper flame holes 5U are not provided at a plurality of locations in the circumferential direction matching the plurality of five virtue claws in order to prevent the flame from touching the five virtue claws and causing incomplete combustion. Accordingly, the number of the lower flame holes 5L is slightly larger than the number of the upper flame holes 5U. However, the area of each lower flame hole 5L is much smaller than the area of each upper flame hole 5U, so the total area of the lower flame holes 5L is smaller than the total area of the upper flame holes 5U. Further, as described later, the air-fuel mixture is supplied to the upper flame hole 5U and the lower flame hole 5L through different paths.

  The burner 3 further includes a mixing tube unit 6 installed in the stove body 1. The mixing tube unit 6 is provided with a first mixing tube 6U for the upper flame hole 5U and a second mixing tube 6L for the lower flame hole 5L. The mixture of the fuel gas and the primary air ejected from the first and second nozzles 7U and 7L arranged facing the upstream ends of the first and second mixing tubes 6U and 6L is mixed. It is made to generate | occur | produce in the pipe | tubes 6U and 6L.

  The mixing tube unit 6 is further provided with inner and outer triple cylinder portions 61, 62, 63 that rise toward the burner opening 2 a of the top plate 2. The air-fuel mixture from the first mixing pipe 6U is supplied to the space between the inner cylinder part 61 and the intermediate cylinder part 62, and the air-fuel mixture from the second mixing pipe 6L is between the intermediate cylinder part 62 and the outer cylinder part 63. Supplied to the space.

  The burner head 4 includes an annular upper head member 41 having an inner cylindrical portion 41a fitted to the inner cylindrical portion 61, and an annular intermediate head having an inner circumferential cylindrical portion 42a fitted to the intermediate cylindrical portion 62. The upper and lower members are composed of a member 42 and a cylindrical lower head member 43 coupled to the upper end of the outer cylinder portion 63. An annular projection on which the upper head member 41 is seated is erected on the outer peripheral portion of the upper surface of the intermediate head member 42, and a groove serving as the upper flame hole 5U is formed in the projection. In addition, an annular protrusion seated on the upper end of the lower head member 43 is provided on the outer periphery of the lower surface of the intermediate head member 42, and a groove serving as the lower flame hole 5L is formed in the protrusion.

  Thus, an air-fuel mixture supply path for the upper flame hole 5U is constituted by the first mixing pipe 6U, the space between the inner cylinder portion 61 and the intermediate cylinder portion 62, and the space between the upper head member 41 and the intermediate head member 42. Is done. Further, an air-fuel mixture supply path for the lower flame hole 5L is constituted by the second mixing pipe 6L, the space between the intermediate cylinder portion 62 and the outer cylinder portion 63, and the space between the intermediate head member 42 and the lower head member 43. Is done.

  The lower head member 43 is provided with a skirt portion 43a extending downward from the outer periphery of the upper end portion. And the cover ring 8 which covers the burner opening 2a of the top plate 2 is extrapolated to the skirt portion 43a so that the infiltration of the spilled juice from the burner opening 2a can be prevented by the cover ring 8.

  The burner 3 includes a spark plug 9 that ignites the lower flame hole 5L, and a thermocouple that detects the flame in the lower flame hole 5L at a position opposite to the circumferential direction of the burner head 4 from the position where the spark plug 9 is disposed. A flame detecting element 10 is attached. Although the flame detection element 10 is preferably arranged at a position 180 ° away from the arrangement position of the spark plug 9 in the circumferential direction, in this embodiment, in order to avoid interference with the mixing tube unit 6, The circumferential interval between the thermocouple 10 is unavoidably narrower than 180 °. Further, the intermediate head member 42 is provided with a target portion 42 b that faces the spark plug 9. The burner 3 is further provided with a pan bottom temperature sensor 11 that is positioned in the inner circumferential space of the burner surrounded by the burner head 4 and detects the temperature of the cooking container.

  Referring to FIG. 2, an electromagnetic safety valve 13 and a main valve 14 on the downstream side are interposed in the fuel gas supply path 12 for the burner 3. The fuel gas supply path 12 has a first branch path 12U connected to the first nozzle 7U facing the first mixing pipe 6U and a second branch facing the second mixing pipe 6L on the downstream side of the main valve 14. It branches off to the second branch path 12L connected to the nozzle 7L. Flow control valves 15U and 15L are provided in the first and second branch paths 12U and 12L, and an electromagnetic on-off valve 16 is further provided in the first branch path 12U.

  The main valve 14 is opened and closed by operating a known operation button (not shown). Further, the flow rate adjusting valves 15U and 15L are operated by a heating power adjusting lever (not shown). The combustion amount of the upper flame hole 5U is adjusted from strong fire to extinguishing via the first flow rate control valve 15U interposed in the first branch passage 12U by the heating power adjustment lever, and is provided in the second branch passage 12L. The amount of combustion in the lower flame hole 5L is adjusted from low to high through the second flow rate control valve 15L.

  The electromagnetic safety valve 13 and the electromagnetic opening / closing valve 16 are controlled by a controller 17 that inputs an output signal of the flame detection element 10. Further, a notifying means 18 comprising a buzzer controlled by the controller 17 is provided.

  Next, the operation at the time of ignition by the operation of the operation button will be described with reference to FIG. The operation button can be pushed in from the fire extinguishing position to the ignition position. When the pressure is released at the ignition position, the operation button returns to the combustion position slightly before the ignition position and is locked at this position. Then it returns to the fire extinguishing position.

  When the operation button is pushed to the ignition position (time t1), the electromagnetic safety valve 13 is pressed and opened, the main valve 14 is opened, the ignition switch is closed, and the spark plug 9 performs spark discharge. Is called. On the other hand, the electromagnetic on-off valve 16 remains closed. Therefore, the air-fuel mixture is supplied only to the lower flame hole 5L during the ignition operation. Even if it takes time to purge the air from the air-fuel mixture supply path for the lower flame hole 5L, the lower flame hole 5L is ignited without supplying the air-fuel mixture to the upper flame hole 5U. Will not occur.

  After ignition, the operation button is returned to the combustion position (time t2), but the main valve 14 is maintained in the open state even at the combustion position. On the other hand, when the operation button returns to the combustion position, the spark discharge at the spark plug 9 is stopped and the pressing of the electromagnetic safety valve 13 is released. However, the electromagnetic safety valve 13 is forcibly energized for a predetermined hold time by the controller 17 and is kept open. Then, during this hold time, the flame moves to the lower flame hole 5L facing the flame detection element 10, and when the flame detection element 10 detects a flame (time t3), the electromagnetic signal is output by the detection signal from the flame detection element 10 thereafter. The safety valve 13 is kept open. When a detection signal is output from the flame detection element 10, the controller 17 activates the notification means 18 for a predetermined time. Then, the electromagnetic on-off valve 16 is opened during the operation of the notification means 18 or after the operation is completed (time t4). Thereby, supply of the air-fuel mixture to the upper flame hole 5U is started.

  Here, since the flame detection element 10 is located on the opposite side of the burner head 4 in the circumferential direction from the position where the ignition plug 9 is disposed, when the flame detection element 10 detects a flame, the lower flame hole of almost the entire circumference of the burner head 4. It will be in a state where it is transferred to 5L. In this state, since the supply of the air-fuel mixture to the upper flame hole 5U is started, the smooth flame transfer from the lower flame hole 5L to the upper flame hole 5U is performed over the entire circumference of the burner head 4.

  Prior to the start of the supply of the air-fuel mixture to the upper flame hole 5U, the notification means 18 is activated. For this reason, even if the fire is suddenly changed to the upper flame hole 5U, the user can know in advance that the ignition means 18 is activated to make a strong fire. Therefore, the user is not surprised by a sudden change to a high fire condition.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the area of each lower flame hole 5L is made smaller than the area of each upper flame hole 5U, but a lower flame hole having a larger area than the upper flame hole 5U is provided that extends in the circumferential direction of the burner head 4. It is also possible. In this case, the number of lower flame holes is made smaller than the number of upper flame holes so that the total area of the lower flame holes is smaller than the total area of the upper flame holes. Moreover, in the said embodiment, although the thermocouple was used as the flame detection element 10, a flame rod may be used. Further, in the above embodiment, the buzzer is used as the notification means 18, but a notification device that notifies the start of the supply of the air-fuel mixture to the upper flame hole 5 </ b> U or a notification device that uses a lamp or the like is used. Is also possible.

Sectional drawing of the burner of embodiment of this invention. The perspective view of the burner of embodiment. The time chart which shows the action | operation at the time of ignition of the burner of embodiment.

Explanation of symbols

  3 ... Stove burner, 4 ... Burner head, 5U ... Upper flame hole, 5L ... Lower flame hole, 6U ... Upper flame hole mixing tube, 6L ... Lower flame hole mixing tube, 9 ... Spark plug, 10 ... Flame detection Element 18 ... notification means.

Claims (2)

On the peripheral surface of the burner head, a number of upper and lower two-stage flame holes are provided at intervals in the circumferential direction, and an air-fuel mixture is supplied to the upper and lower flame holes through different paths, and the lower flame is provided. In the stove burner in which the total area of the hole is smaller than the total area of the upper flame hole,
An ignition plug that ignites the lower flame hole, and a flame detection element that detects the flame of the lower flame hole at a position opposite to the circumferential direction of the burner head from the position where the ignition plug is disposed,
When the burner is ignited, the lower flame hole is ignited by the spark plug with the air-fuel mixture supplied only to the lower flame hole, and the supply of the air-fuel mixture to the upper flame hole is started when the flame detection element detects the flame. Stove burner characterized by   2. The stove burner according to claim 1, wherein when the flame detection element detects a flame, the supply of the air-fuel mixture to the upper flame hole is started after the notification means is activated.

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