JP4191656B2 - Gas stove - Google Patents

Description

  The present invention relates to a gas stove provided with a burner body including a burner body and a burner head that is detachably mounted on the burner body.

  In general, a spark plug and a thermocouple for detecting a flame are attached to the burner. Therefore, it is necessary to place the burner body on the burner head in a predetermined phase so that the ignition flame holes and flame detection flame holes formed on the burner body face the ignition plug and the thermocouple. Therefore, conventionally, as a measure to prevent erroneous setting of the burner head, a concave portion and a convex portion are formed in the burner body and the burner head, respectively, and the convex portion is fitted into the concave portion when the burner head is placed at a predetermined phase. What has been made known is known (see, for example, Patent Document 1).

According to this, when the burner head is not correctly placed on the burner body in a predetermined phase, the convex portion does not fit into the concave portion, so that the burner head floats and the burner head is not correctly placed. Can be recognized. However, some users do not think that it is abnormal even if the burner head is floating, and in an extreme example, some people place the burner head upside down and place it on the burner body. The burner head is often ignited without noticing that the burner head is not properly placed. In such a burner head mis-set state, a normal flame is not formed in the stove burner, and cooking cannot be performed well.
JP-A-6-185707 (paragraph 0012, FIG. 1, FIG. 4, FIG. 5)

  In view of the above, an object of the present invention is to provide a gas stove that can prevent the burner head from being burned without noticing that the burner head is in an erroneously set state.

  In order to solve the above problems, the present invention is a safety device in a gas stove provided with a burner body comprising a burner body and a burner head detachably mounted on the burner body. Burner head detecting means for detecting that the burner head is correctly placed, and combustion restriction means for making the burner incombustible when the burner head detecting means does not detect that the burner head has been correctly placed. It is characterized by that.

In order to solve the above-mentioned problems, the present invention is a safety device in a gas stove provided with a burner body and a burner head that is detachably mounted on the burner body. Burner head detection means for detecting that the burner head has been correctly placed, and combustion restriction means for making the burner incombustible when the burner head detection means does not detect that the burner head has been correctly placed. The burner head detection means is a detector that detects the detection piece provided in the burner head and the position of the detection piece when the burner head is correctly placed as a reference position, and the detection piece is present at the reference position. It is comprised by these.

  Further, the combustion limiting means includes at least one of an ignition operation preventing means for preventing the ignition operation by the operation element for the cono burner and a gas supply stopping means for preventing the gas from being supplied to the cono burner. Is desirable. Here, there is a possibility that the burner head hits the burner head during combustion of the stove burner and the burner head is set in an erroneous setting state. In this case, the combustion of the burner continues only with the ignition operation blocking means. However, if the gas supply stop means is provided, even if the burner head is set incorrectly during combustion, The gas supply is stopped and extinguished.

  By the way, the gas stove is generally provided with an electromagnetic safety valve that is held open based on the output of the flame detection element of the stove burner as a misfire safety measure. And if this electromagnetic safety valve and the control means for shutting off the electromagnetic safety valve and closing the electromagnetic safety valve when the burner head detection means does not detect that the burner head is correctly placed, the gas supply stop means is constituted. This eliminates the need for a dedicated valve for the gas supply stopping means, thereby reducing the cost. However, since the electromagnetic safety valve is forcibly pressed and opened by the ignition operation by the operation element for the stove burner, if an ignition operation is performed with the burner head being set incorrectly, the raw gas is released during the ignition operation. there is a possibility. Therefore, when an electromagnetic safety valve is used as a valve for the gas supply stop means, it is desirable to use an ignition operation blocking means as a combustion restriction means so that the ignition operation cannot be performed when the burner head is set incorrectly.

  Further, if the burner head becomes incombustible when the burner head is set incorrectly as in the present invention, a user who does not notice the incorrect setting may misunderstand that it is a failure. Therefore, it is desirable to provide notifying means that operates when the burner head detecting means does not detect that the burner head is correctly placed, so that the user does not misunderstand.

  With reference to FIG. 1, 1 is a top plate which covers the upper surface of the stove main body (not shown) of a gas stove. The top plate 1 has a burner opening 2, and a stove burner 3 is disposed in the stove body so as to face the burner opening 2. And the cooking container mounted on the top plate 1 via the virtues 4 is heated by the flame of the stove burner 3.

  The stove burner 3 mounts an annular burner head 33 on an annular burner body 32 connected to the mixing tube 31, and forms a number of flame holes 34 that open outwardly by the tooth profile on the lower surface of the outer periphery of the burner head 33. It consists of an annular burner. The burner body 32 is made of sheet metal and has an inner cylinder 32a and an outer cylinder 32b. The outer cylinder 32b is formed with a seating portion 32c at the upper end where the tooth profile of the burner head 33 is seated, and a spilled cover portion 32d projecting outward from the seating portion 32c, and the spilled cover portion 32d is used for the burner. An annular juice tray 5 that receives the boiled spilled juice falling into the opening 2 is detachably supported. Also, the burner head 33 has a phase determining cylinder that engages with an inner circumferential centering cylinder part 33a that fits into the inner cylinder 32a and an outwardly recessed part 32e formed in a part of the outer cylinder 32b. Convex part 33b is formed. When the burner head 33 is placed on the burner body 32 in a normal phase in which the convex portion 33b engages with the concave portion 32e, the thermocouple 35 is a flame detecting element arranged facing one place around the stove burner 3. In addition, flame detection holes 34 a formed in the burner head 33 are opposed to each other. Although not shown in the drawing, if a spark plug is disposed around the stove burner 3 adjacent to the thermocouple 35 and the burner head 33 is placed on the burner body 32 in a normal phase, it is used for detecting the flame. An ignition flame hole formed in a portion of the burner head 33 adjacent to the flame hole 34a faces the ignition plug.

  Gas is supplied to the stove burner 3 via a valve unit 7 that is operated by a push button type operating element 6 that swings around a pin portion 61 that is pivotally supported by the stove body. The valve unit 7 includes an interlocking block 71 that faces the boss portion 62 on the back surface of the operation element 6, a push rod 72 that moves when pushed by the interlocking block 71, an electromagnetic safety valve 73 that faces the push rod 72, and a push rod 72. And a main valve 74 attached to the intermediate portion. A heart cam type push-push mechanism 75 is assembled to the interlocking block 71. Then, according to the first pressing operation of the operation element 6, the interlocking block 71 is pushed by the boss portion 61, moves from the backward end position (position shown in the figure) to the forward end position, and follows the interlocking block 71. The main valve 74 is opened by the movement of the push rod 72, the electromagnetic safety valve 73 is forcibly pressed and opened, gas is supplied to the stove burner 3, and an ignition switch (not shown) is closed. A spark discharge is performed at the spark plug, and the burner 3 is ignited. When the pushing operation of the operation element 6 is released in this state, the interlocking block 71 and the push rod 72 are moved backward from the forward movement end position, and this backward movement is locked at the intermediate position by the push push mechanism 75. In this state, the main valve 74 is kept open, but the push of the electromagnetic safety valve 73 by the push rod 72 is released, and the electromagnetic safety valve 73 is held open by the electromotive force of the thermocouple 35. And if the electromotive force of the thermocouple 35 falls by misfire of the stove burner 3, the electromagnetic safety valve 73 will close and the gas supply to the stove burner 3 will be stopped. When the operation element 6 is pushed a second time, the locking of the interlocking block 71 at the intermediate position is released, the interlocking block 71 and the push rod 72 return to the return end position, and the main valve 74 is closed. Thus, the gas supply to the stove burner 3 is stopped.

  Further, a gas amount adjusting valve 76 is incorporated in the valve unit 7 so as to be positioned on the downstream side of the main valve 74. The control valve 76 is constituted by a needle valve that is advanced and retracted via a cam 76b by a thermal power control lever 76a. The gas is supplied from the gas flow control valve 76 to the mixing pipe 31 of the stove burner 3 through the nozzle 77.

  In the above configuration, in this embodiment, the burner head detection unit 8 that detects that the burner head 33 is correctly placed on the burner body 32 and the burner head detection unit 8 does not detect that the burner head is correctly placed. In other words, when the burner head 33 is erroneously set, combustion limiting means 9 is provided for making the burner 3 incombustible state. The burner head detection means 8 is a burner head in a state where the detection piece 81 extending downward from the centering cylinder portion 33a of the burner head 33 and the convex portion 33b of the burner head 33 are engaged with the concave portion 32e of the burner body 32. The position of the detection piece 81 when 33 is correctly placed on the burner body 32 is used as a reference position, and the detector 82 detects this when the detection piece 81 is at the reference position. As the detector 82, a limit switch, a reed switch, a proximity switch, an optical sensor, a weight sensor, or the like can be used.

  The combustion restricting means 9 is a controller 91 for inputting a signal from the detector 82, and two means controlled by the controller 91, that is, an ignition operation blockage for blocking an ignition operation by the operation element 6 for the burner 3. It comprises means 92 and gas supply stop means 93 for preventing gas from being supplied to the stove burner 3. The ignition operation blocking means 92 is an inoperative position (a position indicated by a solid line in FIG. 1) that allows an ignition operation by the operation element 6, that is, a pushing operation of the operation element 6, and an operation position that disables the pushing operation of the operation element 6. The lock piece 921 can be moved back and forth (the position indicated by the phantom line in FIG. 1), and a drive source 922 of the lock piece 921. As the drive source 922, a solenoid, a motor, or the like can be used. When the detector 82 cannot detect that the detection piece 81 is in the reference position, the controller 91 causes the lock piece 921 to advance to the operating position via the drive source 922. Thus, when the burner head 33 is incorrectly set, the operation element 6 cannot be pushed and the stove burner 3 is not ignited.

  The gas supply stop means 93 includes an electromagnetic safety valve 73 and a switch 931 provided in the connection circuit 35 a of the thermocouple 35 for the electromagnetic safety valve 73. When the detector 82 cannot detect that the detection piece 81 is in the reference position, the controller 91 opens the switch 931. According to this, when the burner head 33 hits the burner head 33 after the stove burner 3 is ignited and the burner head 33 is in an erroneous setting state, the electromotive force from the thermocouple 35 is not energized to the electromagnetic safety valve 73, and the electromagnetic The safety valve 73 is closed, the gas supply to the stove burner 3 is stopped, and the fire is extinguished.

  In the present embodiment, the electromagnetic safety valve 73 is directly held open by the electromotive force of the thermocouple 35. However, the controller 91 monitors the electromotive force of the thermocouple 35, and the electromotive force exceeding the standard. When this occurs, the electromagnetic safety valve 73 may be energized from the controller 91 to keep the electromagnetic safety valve 73 open. In this case, when the detector 82 cannot detect that the detection piece 81 is at the reference position, the controller 91 stops energization of the electromagnetic safety valve 73. In this case, the controller 91 and the electromagnetic safety valve 73 constitute the gas supply stop means 93.

  By the way, when the burner head 3 becomes incombustible due to the action of the combustion restricting means 9 in the erroneously set state of the burner head 33, there is a possibility that the user who does not notice the erroneous setting is misunderstood. Therefore, in this embodiment, the alarm device 10 controlled by the controller 91 is provided. And when the detector 82 cannot detect that the detection piece 81 exists in the reference position, the alarm device 10 is operated so that the user does not misunderstand. As the alarm device 10, a buzzer, a lamp, or a device that informs by voice that the burner head 33 is in an erroneous setting state can be used.

  FIG. 2 shows a second embodiment. In this device, a lever 11 is provided such that one end 11 a faces the detection piece 81 and the other end 11 b faces the operation element 6. The lever 11 is swingably supported in the stove body by an intermediate fulcrum part 11c, and is further urged by a spring (not shown) in a direction in which the one end 11a moves upward. When the burner head 33 is correctly placed, one end 11a of the lever 11 is pushed down by the detection piece 81, and the other end 11b of the lever 11 moves up (state shown by a solid line in FIG. 2). Although the pushing operation of the child 6 is allowed, when the burner head 33 is set incorrectly, the one end 11a of the lever 11 moves up and the other end 11b moves down (the state shown by the phantom line in FIG. 2). 11b faces the boss portion 62 of the operating element 6 and the pressing operation of the operating element 6 is prevented. Thus, the mechanical burner head detection means 8 is constituted by the detection piece 81 and the one end 11a of the lever 11, and the ignition operation prevention means 92 mechanically interlocked with the burner head detection means 8 by the other end 11b of the lever 11. Is configured.

  In the second embodiment, a limit switch 932 is provided which is closed by abutting against the lever 11 when the one end 11 a of the lever 11 is pushed down, and the limit switch 932 is connected to the electromagnetic safety valve 73. 35a. Therefore, when the burner head 33 is set incorrectly, the limit switch 932 is opened, the electromotive force of the thermocouple 35 to the electromagnetic safety valve 73 is cut off, and the electromagnetic safety valve 73 is closed. Thus, the gas supply stop means 93 is configured by the electromagnetic safety valve 73 and the limit switch 932, and the burner 3 can be extinguished when the burner head 33 is in an erroneously set state after the burner 3 is ignited.

  The embodiment in which the ignition operation blocking unit 92 and the gas supply stop unit 93 are provided as the combustion limiting unit 9 has been described above, but it is also possible to provide only one of the ignition operation blocking unit 92 and the gas supply stop unit 93. is there.

  In the above embodiment, the electromagnetic safety valve 73 is used as a valve for the gas supply stop means 93. However, an electric gas amount adjusting valve is provided, and the controller 91 controls the gas amount adjusting valve when the burner head 33 is erroneously set. May be closed. It is also possible to provide a dedicated solenoid valve for the gas supply stop means 93. However, providing an electrically operated gas amount adjusting valve or a dedicated solenoid valve increases the cost. Therefore, in order to reduce the cost, it is desirable to use the electromagnetic safety valve 73 also as a valve for the gas supply stop means 93. Here, when the burner head 33 is set incorrectly, it does not ignite well even if a spark discharge occurs in the spark plug. Therefore, the operation element 6 may continue to be pushed, while the electromagnetic safety valve 73 remains pressed open. Raw gas will be released. Therefore, when the electromagnetic safety valve 73 is also used as the valve for the gas supply stop means 93, it is desirable to use the ignition operation blocking means 92 together to prevent the release of raw gas.

  Moreover, in the said embodiment, although the burner head detection means 8 is comprised using the detection piece 81 suspended from the centering cylinder part 33a of the burner head 33, it is not restricted to this, For example, a burner body It is also possible to embed a detector such as a proximity switch for detecting the engagement of the convex portion 33b of the burner head 33 with the concave portion 32e of the 32, and to constitute the burner head detecting means 8 with this detector. .

The cut-away view of the principal part of the gas stove of 1st Embodiment of this invention. Sectional drawing of the principal part of the gas stove of 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 3 ... Combustor, 32 ... Burner body, 33 ... Burner head, 35 ... Thermocouple (flame detection element), 6 ... Operator, 7 ... Valve unit, 73 ... Electromagnetic safety valve, 8 ... Burner head detection means, 9 ... Combustion Limiting means, 92... Ignition operation blocking means, 93... Gas supply stopping means, 10.

Claims (4)

A gas stove provided with a stove burner composed of a burner body and a burner head detachably mounted on the burner body,
Burner head detection means for detecting that the burner head is correctly placed on the burner body;
Combustion restricting means for making the stove burner incombustible state when the burner head detecting means does not detect that the burner head has been correctly placed .
The burner head detection means includes a detection piece provided on the burner head, and a detector that detects the position of the detection piece when the burner head is correctly placed as a reference position and detects the detection piece at the reference position. gas stove, characterized in that configured in.   The combustion restricting means includes at least one of an ignition operation preventing means for preventing an ignition operation by a control element for a conburner and a gas supply stopping means for preventing a gas from being supplied to the stove burner. The gas stove according to claim 1.   The gas supply stop means is an electromagnetic safety valve that is pressed and opened by an ignition operation by an operation element for a stove burner and is held open based on the output of the flame detection element of the burner, and a burner head is a burner head detection means. A control means for cutting off the energization of the electromagnetic safety valve and closing the electromagnetic safety valve when it is not detected that it is correctly placed, and the ignition operation preventing means is used in combination as the combustion limiting means. The gas stove according to 2.   The gas stove according to any one of claims 1 to 3, further comprising notification means that operates when the burner head detection means does not detect that the burner head is correctly placed.

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