JP5184571B2 - Gas stove - Google Patents

Description

  The present invention relates to a gas stove.

  There is a safety device that disappears in the safety function of the gas stove. The extinguishing safety device detects the flame ejected from the main burner with a flame detector and shuts off the gas supply in response to the extinction of the flame. There are a flame rod type and a thermocouple type in the flame detector of the extinguishing safety device. The flame rod method uses a rectifying action of a flame to electrically detect the presence or absence of a flame. For this reason, the frame rod method requires an AC power supply and is expensive.

  The thermocouple method has the following problems. Thermocouples (thermocouples) have a shorter life when the temperature is too high. Therefore, it is necessary to dispose the thermocouple at some distance from the flame so that it does not go too deep into the flame when the heating power is high. However, if the thermocouple is moved too far away from the flame, it will move away from the flame when it is set to low heat, and the detection accuracy will decrease. The gas stove is provided with a pilot burner that gives a reignition spark when the main burner goes out. For this reason, in recent years, there has been proposed a extinguishing safety device of a type that detects the ignition of a pilot burner without the strength of the thermal power with a thermocouple instead of the main burner side (Patent Document 1 below).

  By the way, in a gas stove that requires a high calorific value, such as for business use, the main burner has a double structure of an inner burner and an outer burner. In such a double type burner, a pilot burner is required for each of the inner and outer burners, so two thermocouples are also required.

JP 2007-271195 A

In the above configuration, it is necessary to provide the pilot burner and the thermocouple in both the inner burner and the outer burner, which increases the number of parts. In addition, when attaching and detaching each burner, the pilot burner and the thermocouple get in the way, so the maintainability is poor.
The present invention has been completed based on the above-described circumstances, and aims to reduce the number of components and to improve workability when attaching / detaching a main burner.

  The present invention usually includes a double burner composed of an inner burner and an outer burner, a side-opening type accommodating portion recessed at the bottom of the outer burner, and a cylindrical head portion having gas outlets at both ends. A gas cock comprising a fire pilot burner, a thermocouple for detecting a flame of the normal fire pilot burner, and a safety valve for shutting off the gas supply to the double burner on condition that no flame is detected by the thermocouple A head portion of the pilot burner for normal fire is disposed with one end facing inward and the other end facing outward with respect to the housing portion of the outer burner. It is the structure which always supplies a spark to the burner of both the said inner side burner and the said outer side burner through the gas jet nozzle. In this way, it is possible to supply the sparks to both the internal and external burners with a single pilot fire burner, and since only one thermocouple is required, the number of parts can be reduced. In addition, since the normal-fire pilot burner (specifically, its head portion) is arranged in the accommodating portion formed at the bottom of the outer burner, it does not get in the way when the double burner is removed.

As an implementation of the present invention, the following configuration is preferable.
The ignition pilot burner is provided separately from the normal fire pilot burner. If it does in this way, if at least any one of an outer side burner or an inner side burner does not catch fire, it will not transfer to a pilot burner for normal fires.

The safety valve is an electromagnetic valve that opens the fuel gas supply path in response to the thermoelectromotive force of the thermocouple, and closes the fuel gas supply path in other cases, and the ignition pilot burner A power supply circuit is provided for forcibly applying a voltage corresponding to the thermoelectromotive force to the solenoid valve until fire is transferred to the normal-fire pilot burner via the double burner. In this way, the user does not have to perform an operation of opening the solenoid valve until the ignition burner is transferred to the normal-fire pilot burner. Therefore, it is easy to use.

  According to the present invention, the number of components can be reduced. Moreover, it becomes possible to improve workability | operativity at the time of attaching / detaching a double burner.

Sectional drawing which shows the internal structure of the gas stove applied to one Embodiment of this invention Gas stove perspective view (only main parts such as double burner are shown) Plan view of FIG. Enlarged view of Fig. 2 (showing the area around the pilot burner for normal fire) Enlarged view of Fig. 1 (Around the pilot burner for normal fire) Cross section of the safety valve (showing the operating principle) Gas stove block diagram Diagram showing removal operation of double burner

<One Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
1. 1. Structure Description FIG. 1 is a sectional view of a gas stove 10, FIG. 2 is a perspective view of the gas stove 10, and FIG. 3 is a plan view of the gas stove 10. The gas stove 10 includes a main burner 30, mixing pipes 37 and 47, an ignition pilot burner 50, a normal-fire pilot burner 60, a thermocouple 70, a gas cock device 80, and a stove body 20 that accommodates them. Prepare. In the following description, the front side refers to the operation surface side of the user (the installation side of the gas cock device 80 (left side in FIG. 1)).

  The stove body 20 is made of stainless steel, for example, and has a generally box shape as shown in FIG. The center of the stove body 20 is opened, and the main burner 30 is accommodated therein.

  The main burner 30 is an iron casting, and is a double burner 30 including an inner burner 31 and an outer burner 41 that is disposed outside the inner burner 31 and is slightly larger than the inner burner 31. Both the inner burner 31 and the outer burner 41 are hollow, and the inside is a hollow gas passage P. In the upper part of the inner burner 31 and the outer burner 41, a plurality of flame openings H are formed at regular intervals over the entire circumference. Each of these flame outlets H penetrates the wall surface of each burner and communicates with the gas passage P.

  In this embodiment, the flame burner H is formed on both the inner and outer peripheral sides of the inner burner 31, whereas the flame burner H is formed only on the outer burner of the outer burner 41. Yes, the inner peripheral side of the outer burner 41 is non-porous. Further, a linear slit 43 is formed on the upper surface portion of the outer burner 41 at a position on the back left side in FIG. The slit 43 transfers sparks between the outer burner 41 and the inner burner 31 and communicates with the gas passage P of the outer burner 41.

  A pair of mixing tubes 37 and 47 are arranged in parallel below the main burner (hereinafter referred to as double burner 30) 30 in the depth direction of the stove body 20. The mixing tubes 37 and 47 are for introducing a mixed gas of fuel gas and primary air into the inner burner 31 and the outer burner 41. In this embodiment, the left mixing tube 47 shown in FIG. 3 is for the outer burner 41, the right mixing tube 37 is for the inner burner 31, and the end of each tube is connected to the bottom surface of each burner. Yes.

  A metal base 25 is attached inside the stove body 20. The metal base 25 has a U-shaped cross section as shown in FIGS. 2 and 3 and is provided in a pair on the front side and the rear side of the mixing tubes 37 and 47. The metal bases 25F and 25R extend in parallel while intersecting with the mixing tubes 37 and 47, and support the mixing tubes 37 and 47 accommodated in the stove main body 20 and the double burner 30 disposed above the mixing tubes 37 and 47. .

  As shown in FIG. 2, the ignition pilot burner 50 is attached via a bracket B at a position corresponding to the side of the mixing tube 47 on the metal base 25F on the front side. The ignition pilot burner 50 is fixed obliquely laterally with the gas injection port formed at the tip of the burner facing the outer burner 41. A spark plug 53 is fixed to the bracket B together with an ignition pilot burner 50. The spark plug 53 receives a high voltage from the igniter 55 (a boost device) and sparks to perform the function of igniting the ignition pilot burner 50.

  An accommodating portion 45 is recessed in the bottom portion on the front side of the outer burner 41. The accommodating part 45 is a side-open type and is open to both the inside and outside of the burner 41 (both inside and outside).

  The normal-fire pilot burner 60 is formed by processing a metal plate (specifically, formed by combining two metal plates together). Such a normal-fire pilot burner 60 has a cylindrical head portion 63 provided with gas outlets 64 and 65 at both ends, and extends downward from the center of the head portion 63 to introduce fuel gas into the head portion 63. And an introduction pipe portion 61 (see FIGS. 4 and 5). The introduction pipe portion 61 and the head portion 63 are generally T-shaped and communicate with each other.

  An air intake port 61 a is formed in the lower portion of the introduction pipe portion 61, and a linear slit 63 a that penetrates the peripheral wall is formed in the peripheral wall of the head portion 63. The air intake port 61a is an intake port for taking in primary air for combustion. The slit 63 a extends substantially horizontally along the axis of the head portion 63, and the front and rear slit ends reach gas outlets 64 and 65 formed at both ends of the head portion 63, respectively. The slits 63 a transfer the spark between the gas jets 64 and 65 formed on both sides of the head part 63.

  The normal fire pilot burner 60 is fixed to the center of the front metal base 25F with the head portion 63 facing upward. Such a normal-fire pilot burner 60 is located just below the accommodating portion 45 formed in the outer burner 41 and accommodates the head portion 63 from below with respect to the accommodating portion 45.

  As shown in FIGS. 4 and 5, the normal-fire pilot burner 60 has the axis of the head portion 63 oriented in the radial direction of the double burner 30 (left and right direction in FIG. 5). The gas outlet 64 is protruded inward from the inner opening 45a, and the other end (gas outlet) 65 faces the outer opening 45b. By doing in this way, a fire is supplied to the inner burner 31 through the gas jet port 64 on one end side projecting inward (always supplied), and the outer side through the gas jet port 65 on the other end side projecting outward. A spark can be supplied to the burner 41 (always supplied).

  The thermocouple (thermocouple) 70 detects the flame of the normal fire pilot burner 60. As shown in FIGS. 4 and 5, on the front metal base 25F, in front of the normal fire pilot burner 60, Along with the normal fire pilot burner 60, it is mounted vertically. Then, the thermocouple 70 has the tip detection unit 73 facing the tip of the other end 65 of the pilot burner 60 for normal fire. From the above, when the normal fire pilot burner 60 is ignited, the flame heats the detection unit 73 and causes the thermocouple 70 to generate a thermoelectromotive force. On the other hand, when the normal fire pilot burner 60 is not ignited, the detection unit 73 is not heated, and the thermocouple 70 does not generate a thermoelectromotive force.

  In order to improve the flame detection performance of the thermocouple 70, it is preferable that the mounting position of the thermocouple 70 is not shifted from the normal fire pilot burner 60. In this embodiment, the holding portion 62 is provided integrally with the normal fire pilot burner 60. The holding portion 62 has a cylindrical shape that allows a thermocouple (specifically, a lower portion of the thermocouple) 70 to be fitted without a gap, and is configured to hold the thermocouple 70 without misalignment. As described above, in this embodiment, the thermocouple 70 is attached to the normal fire pilot burner 60, and both parts are unitized and then attached to the metal base 25F so that high positional accuracy can be compensated. It has become.

  The gas cock device 80 is mainly composed of a cock body 81, an operation means (hereinafter referred to as operation knob) 85, a safety valve 90, and a main valve 87, and is arranged on the front side (lower side of FIGS. 2 and 3) of the double burner 30. Has been placed. The cock body 81 is generally box-shaped. A gas intake port 82 connected to the gas source is formed on the upper wall of the cock body 81, and the fuel gas is taken into the gas intake port 82 therethrough.

  A fuel gas supply path is formed in the gas cock main body 81, and a safety valve 90 and a main valve 87 are built therein. The safety valve 90 is provided on the upstream side of the main valve 87. As shown in FIG. 6, the safety valve 90 includes a guide plate 91, a valve body 92 to which a valve shaft 93 is fixed, and an electromagnet 98. The valve shaft 93 of the valve body 92 penetrates the guide hole formed in the guide plate 91 so as to be slidable, and the valve body 92 is movable in the left-right direction in the drawing. A coil spring 94 is wound around the valve shaft 93, and an iron piece 95 is fixed to the rear end of the valve shaft 93. The iron piece 95 is provided with an electromagnet 98 so as to face the iron piece 95.

  The coil wire 99 of the electromagnet 98 is connected to the thermocouple 70. From the above, when the thermocouple 70 detects the flame of the pilot burner 60 for normal fire and generates a thermoelectromotive force, the electromagnet 98 is excited, so that the iron piece 95 is attracted and the valve element 92 is shown in the figure. Pull to the left. As a result, the valve body 92 moves backward on the left side in the drawing, and the fuel gas supply path U is opened ("opening operation"). On the other hand, no thermoelectromotive force is generated in the thermocouple 70 when the normal-fire pilot burner 60 is extinguished. In this case, the valve element 92 is pushed to the right side in the figure by the urging force of the coil spring 94, and the fuel The gas supply path U is closed (“closing operation”). As a result, the supply of fuel gas to the main valve 87 and the burners 30, 50, 60 on the downstream side, which will be described next, is stopped at once.

  Further, reference numeral 86 shown in FIG. The push rod 86 is interlocked with the operation knob 85, and when the operation knob 85 is pressed to perform an ignition operation, the valve element 92 is pushed in the backward direction through the push rod 86 so that the fuel gas supply path U is opened. It has become.

  The main valve 87 is provided on the downstream side of the safety valve 90. The fuel gas supply path U is divided into three branches on the downstream side of the main valve 87, and each gas outlet is connected to the double burner 30 via the gas pipe 100, and the ignition pilot burner 50 is connected via the gas tube 110. The pilot burner 60 for continuous fire is connected to each other. The gas pipe 100 is branched into two, and one end 103 of the branch destination is connected to the mixing pipe 37 of the inner burner 31, and the other end 105 is connected to the mixing pipe 47 of the outer burner 41 (see FIG. 3). When the operation knob 85 is turned, the main valve 87 is opened and the fuel gas is taken into the double burner 30, the ignition pilot burner 50, and the normal fire pilot burner 60.

  Reference numeral 120 shown in FIG. 7 is a voltage circuit. The voltage circuit 120 is triggered by the operation of the operation knob 85 and forcibly applies a voltage corresponding to the thermoelectromotive force to the coil wire 99 of the electromagnet 98 for a certain period of time. A timer (not shown) and a voltage generator (not shown) for generating a voltage are provided. The fixed time is about several seconds, and is set to a time slightly longer than the time required for the fire of the ignition pilot burner 50 to pass through the double burner 30 to the normal fire pilot burner 60. Yes. The trigger input to the voltage circuit 120 may be, for example, by detecting the operation of the operation knob 85 with a contact and using the detection signal as a trigger input.

  And on the stove body 20 of the gas stove 10 configured as described above, the virtues 27 are placed on the upper side of the double burner 30, and cooking is performed by placing a cooking utensil such as a pot on the cooker. Can be done. Further, a juice receiver 28 is installed below the five virtues 27 so that the gas cock device 80 and the like are not blown out.

2. Ignition Operation of Gas Stove 10 To ignite the gas stove 10, the operation knob 85 may be operated (rotated while being pushed). Then, the safety valve 90 is opened by being pushed by the push rod 86. The main valve 87 is opened together with the safety valve 90. Therefore, the fuel gas is taken into the double burner 30, the ignition pilot burner 50, and the normal fire pilot burner 60 through the gas source, and each flame outlet H formed in the double burner 30 and each pilot burner 50, 60. A gas mixture (a mixture of fuel gas and primary air) is ejected from the gas ejection port.

  On the other hand, when the operation knob 85 is operated, the igniter 55 (pressure booster) is activated to spark the spark plug 53. As a result, the ignition pilot burner 50 is ignited. After that, the flame of the ignition pilot burner 50 is transferred to a part of the outer burner 41 (flame H located near the slit 43).

  Then, the fire sequentially moves along the outer periphery of the outer burner 41, and flames are attached to each flame outlet H. In addition, the flame moves to the inner burner 31 through the slit 43 and sequentially moves to each flame outlet H formed on the outer periphery of the inner burner 31.

  At this stage, no fire is transferred to the normal-fire pilot burner 60, the detection unit 73 of the thermocouple 70 is in an unheated state, and the thermocouple 70 does not generate a thermoelectromotive force. Therefore, normally, the electromagnet 98 is not excited, and the valve body 92 of the safety valve 90 is closed when the user releases the operation knob 85. However, in this case, the voltage circuit 120 is activated by the operation of the operation knob 85, and a voltage corresponding to the thermoelectromotive force is forcibly applied to the coil wire 99 of the electromagnet 98 for a certain period of time. Therefore, even if the operation knob 85 is released, the supply of the fuel gas continues, so that the flame of the burner 30 does not disappear after the fire has been transferred to the outer burner 41.

  Now, when the fire transfer proceeds and either the outer burner 41 or the inner burner 31 ignites the front flame head H in FIG. 2, the fire is the head portion of the pilot burner 60 for normal fire. The gas is transferred to one of the gas outlets 63 (for example, the gas outlet 64 on one end side). Then, the fire also moves to the remaining gas ejection port (for example, the gas ejection port 65 on the other end side) of the head portion 63 via the slit 63a. As a result, the head of the pilot burner 60 for normal fire is transferred. The part 63 is in a state in which both sides are ignited. When this stage is reached, the detector 73 of the thermocouple 70 is heated by the flame of the gas outlet 65 (a state in which a flame is detected), and the thermocouple 70 generates a thermoelectromotive force.

  Therefore, the electromagnet 98 maintains the excited state even after the application of the forced voltage by the voltage circuit 120 is cut off as the fixed time elapses thereafter. Therefore, the valve body 92 maintains the state of being pulled in the left direction in FIG. 6, and the safety valve 90 continues to open the fuel gas supply path U. When both the outer burner 41 and the inner burner 31 make a round of fire transfer and all the flame outlets H are ignited, a series of ignition operations is completed.

3. When the ignition operation is completed, as shown in FIG. 1, the normal-fire pilot burner 60 is connected to the inner burner through the gas outlet 64 on one end side protruding inward. 31 is constantly supplied to the outer burner 41 through the gas outlet 65 on the other end facing outward. Therefore, for example, even if the flames of the outer burner 41 and the inner burner 31 are temporarily extinguished due to spilling, if the fire of the normal fire pilot burner 60 is not extinguished, the fire of the normal fire pilot burner 60 is Thus, the burners 31 and 41 are automatically reignited. Therefore, the inner burner 31 and the outer burner 41 maintain the combustion state as long as the normal fire pilot burner 60 continues to supply the spark.

  On the other hand, when the flame of the normal fire pilot burner 60 is extinguished together with the flames of the outer burner 41 and the inner burner 31, the thermocouple 70 is not heated and no thermoelectromotive force is generated. Therefore, the safety valve 90 operates, and the valve element 92 closes the fuel gas supply path U as shown in FIG. From the above, when the gas stove 10 goes out, the supply of fuel gas to the burners 30, 50, 60 is automatically stopped.

4). Description of Effect In the gas stove 10, it is possible to supply a spark to the both internal and external burners 31, 41 with one normal fire pilot burner 60, and only one thermocouple 70 is required. Therefore, the number of parts can be reduced. Further, the head portion 63 of the normal fire pilot burner 60 is disposed in the accommodating portion 45 formed at the bottom of the outer burner 41. Therefore, as shown in FIG. 8, when the double burner 30 is pulled upward and removed, there is no concern that the double burner 30 interferes with the normal-fire pilot burner 60. Therefore, there is no fear of breakage or misalignment in the pilot fire burner 60. In addition, since the double burner 30 can be easily attached and detached, it is easy to maintain.

  In addition, although rarely, if the double burner 30 is clogged with the clog of the flame outlet H or the slit 43, the fire of the ignition pilot burner 50 may not transfer to the double burner 30, Even if it moves, the fire may not turn to each flame outlet H. In this case, since the fire is not transferred to the normal-fire pilot burner 60, the detection unit 73 of the thermocouple 70 is not heated, and the safety valve 90 closes the fuel gas supply path U. Therefore, the safety and reliability of the gas stove 10 are increased. Such an effect is obtained because the gas stove 10 has separate pilot burners 50 and 60 for ignition and normal fire.

  For reference, if the ignition burner 60 and 60 are not used separately as in the gas stove 10 but the ignition burner 60 is used together with the ignition function, Even if there is a situation in which the fire of the pilot burner 60 for normal fire does not turn to the double burner side due to the above-described problem, the detection unit 73 of the thermocouple 70 remains heated. Therefore, in this case, the safety valve 90 is not closed.

  In the gas stove 10, the voltage circuit 120 is actuated by the operation of the operation knob 85, and a voltage corresponding to the thermoelectromotive force is forcibly applied to the coil wire 99 of the electromagnet 98 for a certain period of time. ing. Accordingly, if the user can only confirm that the flame has been transferred to the outer burner 41, the flame of the burner 30 will not be extinguished even if the user removes his / her hand from the operation knob 85 and the fuel gas continues to be supplied. Therefore, the user does not need to keep pressing the operation knob 85 until the fire transfer is completed, which is convenient.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above-described embodiment, an example in which the voltage circuit 120 is provided has been described. However, it is possible to adopt a configuration in which this is eliminated.

DESCRIPTION OF SYMBOLS 10 ... Gas stove 20 ... Stove body 30 ... Double burner 31 ... Inner burner 37 ... Mixing tube 41 ... Outer burner 43 ... Slit 45 ... Housing part 47 ... Mixing tube 50 ... Pilot burner for ignition 60 ... Pilot burner for normal fire 63 ... Head part 64, 65 ... Gas jet outlet 70 ... Thermo couple 80 ... Gas cock device 81 ... Cock main body 85 ... Operation knob 86 ... Push rod 87 ... Main valve 90 ... Safety valve 92 ... Valve body 93 ... Valve shaft 95 ... Iron piece 98 ... Electromagnet 120 ... Voltage circuit H ... Flame outlet

Claims (3)

A double burner consisting of an inner burner and an outer burner;
A side-opening type accommodating portion recessed in the bottom of the outer burner;
A pilot burner for normal fire having a cylindrical head portion provided with gas outlets at both ends;
A thermocouple for detecting the flame of the pilot fire burner;
A gas cock device provided with a safety valve that shuts off the supply of gas to the double burner on the condition that no flame is detected in the thermocouple, and
The head portion of the pilot fire burner is disposed with one end facing inward and the other end facing outward with respect to the housing portion of the outer burner. A gas stove that is configured to constantly supply sparks to both burners of the outer burner.   The gas stove according to claim 1, wherein an ignition pilot burner is provided separately from the normal fire pilot burner. The safety valve is an electromagnetic valve that performs an opening operation to open the fuel gas supply path in response to the thermoelectromotive force of the thermocouple, and closes the fuel gas supply path at other times,
A voltage circuit for forcibly applying a voltage corresponding to the thermoelectromotive force to the electromagnetic valve until the ignition pilot burner is transferred to the normal-fire pilot burner via the double burner; The gas stove according to claim 2, further comprising a gas stove.

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