JP2013079750A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate machining of a burner port for flame-out detection, concerning a flame-out safety device for a safety function of a heating cooker such as a gas stove.SOLUTION: The heating cooker includes: a gas burner body 30 for heating an object by burning a gas supplied through a gas passage P1 formed inside; a thermocouple 70 for detecting flame-out of the gas burner body 30; an auxiliary gas burner 61 mounted on the gas burner body 30 and blowing out a gas branched from the gas burner body, from a burner port 63 for flame-out detection, to heat the thermocouple 70; a gas cock device 80 including an electromagnetic safety valve for shutting off the gas to be supplied to the gas burner body 30 in response to a non-heating state of the thermocouple 70. The auxiliary gas burner 61 is prepared separately from the gas burner body 30.

Description

  The present invention relates to a cooking device.

  There is a safety device that disappears in the safety function of the heating regulator such as gas stove. The extinguishing safety device detects a flame ejected from the burner body with a flame detector, and shuts off the gas supply in response to the extinction of the flame. There is a thermocouple method for the flame detector of the extinguishing safety device.

JP 2003-28428 A

  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.

In order to prevent a decrease in detection accuracy, it is only necessary that the flame hitting the thermocouple becomes constant regardless of the strength of the heating power. In order to achieve this, it is conceivable to form a dedicated flame opening for the purpose of detecting disappearance in the burner body. However, since such a flame mouth is not a circular shape like a normal flame mouth, forming it on the burner body is extremely impractical and unrealistic.
The present invention has been completed based on the above-described circumstances, and an object thereof is to facilitate the processing of a flame outlet for detecting disappearance.

  The present invention provides a gas burner body that heats an object to be heated by burning combustion gas supplied through a gas passage formed therein, a thermocouple for detecting the disappearance of the gas burner body, and the gas burner body. An auxiliary gas burner that is attached and heats the thermocouple by ejecting a combustion gas branched from the gas burner body side from the flame outlet for detection of extinction, and combustion for the gas burner body corresponding to the non-heated state of the thermocouple And a gas cock device having an electromagnetic safety valve that shuts off the gas supply, and the auxiliary gas burner is a separate member from the gas burner body. Note that “disappearance” means a state in which the flame is extinguished even though the main valve supplying the combustion gas is open.

  In this invention, since the auxiliary gas burner is a separate member from the gas burner main body, it is easier to process and can be processed more accurately than when the flame outlet for detecting the extinction is formed directly on the gas burner main body. It is. In addition, in order to process the burner body to satisfy the same function as the auxiliary gas burner, there is a need for a special processing machine (machining center, etc.) due to its complicated structure, and because the base is cast iron, the manufacturing accuracy is poor and stable. It is difficult to obtain a stable flame because the depth of the flame outlet is not controlled.

As an implementation of the present invention, the following configuration is preferable.
-The flame outlet for detecting the extinction has a slit shape. If it is a slit shape, even if the thermal power on the gas burner body side is strong or weak, the thermal power is not so strong. Therefore, even if the heating power on the gas burner body side is strong or weak, the flame hitting the thermocouple can be made almost constant.

  According to the present invention, a flame outlet for detecting disappearance can be easily processed.

Sectional drawing which shows the internal structure of a gas stove in Embodiment 1 of this invention Gas stove perspective view (only main parts such as double burner are shown) Plan view of FIG. Perspective view of auxiliary gas burner The figure which expanded the B section of FIG. The figure which expanded the A section of FIG. Cross section of the safety valve (showing the operating principle) Gas stove block diagram Illustration explaining the effect In Embodiment 2 of this invention, the perspective view of a gas stove Front view of gas stove Perspective view of auxiliary gas burner

<Embodiment 1>
A first 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. A gas stove (an example of the “heating cooker” of the present invention) 10 includes a gas burner body 30, mixing tubes 37 and 47, an ignition burner 50, a thermocouple 70, a gas cock device 80, and a stove body 20 that houses these. And comprising. 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 main body 20 is opened, and the gas burner main body 30 is accommodated therein.

  The gas burner main body 30 is an iron casting, and is a double gas burner 30 that includes an inner gas burner 31 and an outer gas burner 41 that is disposed outside the inner gas burner 31 and is slightly larger than the inner gas burner 31. Both the inner gas burner 31 and the outer gas burner 41 are hollow, and the inside is a hollow gas passage P1. In the upper part of the inner gas burner 31 and the outer gas 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 gas burner and communicates with the gas passage P1.

  In addition, as shown in FIG. 2, the inner gas burner 31 has a closed ring shape as a whole, whereas the outer gas burner 41 has a C shape as a whole, and the front side is greatly cut away. It has a shape. This is because a thermocouple (details will be described later) 70 is arranged on the front side of the inner gas burner 31, and it is necessary to release the thermocouple 70 and the bracket BK2 for fixing the thermocouple 70.

  Further, a linear slit 43 is formed at a position near the front surface of the outer gas burner 41 on the upper surface portion of the outer gas burner 41 so as to cut below the gas burner. The slit 43 extends obliquely toward an auxiliary gas burner (details will be described later) 61 attached to the front surface of the inner gas burner 31. The slit 43 transfers the spark from the outer gas burner 41 to the inner gas burner 31 while relaying the auxiliary gas burner 61.

  Below the gas burner main body 30, a pair of mixing tubes 37 and 47 are arranged in parallel in the depth direction of the stove main body 20. The mixing pipes 37 and 47 are for introducing a mixed gas of fuel gas and primary air into the inner gas burner 31 and the outer gas burner 41. In this embodiment, the left mixing tube 47 shown in FIG. 3 is for the outer gas burner 41, the right mixing tube 37 is for the inner gas burner 31, and the end of each tube is connected to the bottom surface of each gas 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 gas burner main body 30 disposed on the upper side.

  As shown in FIG. 2, the ignition burner 50 is attached via a bracket BK1 at a position corresponding to the side of the mixing tube 47 on the front metal base 25F. The ignition burner 50 is fixed obliquely laterally with the gas injection port formed at the tip of the gas burner facing the outer gas burner 41. An ignition plug 53 is fixed to the bracket BK1 together with the ignition burner 50. The spark plug 53 performs a function of receiving a high voltage from the igniter 55 (a boost device) and sparking it to ignite the ignition burner 50.

  Next, the auxiliary gas burner 61 will be described. The auxiliary gas burner 61 is made of brass, for example, and is made of a member (that is, a separate part) different from the inner gas burner 31 and is generally block-shaped. A gas passage P2 is formed inside the auxiliary gas burner 61, and a plurality of flame openings communicating with the gas passage P2 are formed on the outer peripheral wall. Specifically, as shown in FIG. 4, the front wall of the auxiliary gas burner 61 is formed with two flame ports, a flame port 63 and a flame port 64, vertically. The flame outlet 63 has a slit shape extending in the horizontal direction, and penetrates the front wall from side to side. The flame port 64 is circular. These two flame outlets 63 and 64 formed on the front wall are flame outlets for detecting disappearance for the purpose of hitting a thermocouple 70 described later. Note that “disappearance” means a state in which the flame of the gas burner body 30 is extinguished even though the main valve 87 for supplying combustion gas is open.

  In addition, flame ports 65 </ b> A and 65 </ b> B are formed in the left and right side walls of the auxiliary gas burner 61. The flame ports 65A and 65B formed on the side wall are both circular. These two flame outlets 65A and 65B are for transferring fire from the outer gas burner 41 to the inner gas burner 31.

  A cylindrical attachment portion 68 is formed on the rear wall side of the auxiliary gas burner 61. On the other hand, a mounting hole is opened on the front side of the outer peripheral wall of the inner gas burner 31. This attachment hole penetrates the outer peripheral wall of the inner gas burner 31. Screws are cut on the outer periphery of the attachment portion 65 and the inner periphery of the attachment hole, respectively, and the attachment portion 65 is screwed into the attachment hole, thereby assisting the front side of the outer peripheral wall of the inner gas burner as shown in FIG. A gas burner 61 is attached.

  The inside of the mounting portion 65 is hollow and communicates with the gas passage P2 formed inside the auxiliary gas burner 61 as shown in FIG. 6, so that the auxiliary gas burner 61 is connected from the inner gas burner 31 side. Combustion gas is supplied to the side, and a flame can be lit to each flame outlet 63, 64, 65A, 65B.

  Since the auxiliary gas burner 61 has the gas passage P2 formed vertically inside, the bottom wall 69 is a separate member as shown in FIG.

  The thermocouple (thermocouple) 70 detects a flame (specifically, a flame U for detecting the extinction) that the auxiliary gas burner 61 illuminates. As shown in FIGS. 2 and 5, Is attached vertically through a bracket BK2. Specifically, it is attached to the metal base 25F on the front side. In the thermocouple 70, the tip detection unit 73 faces the tip of the flame outlet 63 formed on the front wall of the auxiliary gas burner 61. From the above, when the flame U illuminates the flame outlets 63 and 64 of the auxiliary gas burner 61, the flame U heats the detection unit 73 and causes the thermocouple 70 to generate a thermoelectromotive force. On the other hand, when the flame U of the auxiliary gas burner 61 is extinguished, the detection unit 73 is not heated and the thermocouple 70 does not generate a thermoelectromotive force.

  The gas cock device 80 is mainly composed of a cock body 81, 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 of the gas burner body 30 (lower side in FIGS. 2 and 3). Has been. 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. 7, the safety valve 90 includes a guide plate 91, a valve body 92 to which the 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 auxiliary gas burner 61 and generates a thermoelectromotive force, the electromagnet 98 is excited, and as a result, the iron piece 95 is attracted and the valve element 92 is drawn to the left side in the drawing. . 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, in a state where the auxiliary gas burner 61 is extinguished, no thermoelectromotive force is generated in the thermocouple 70. In this case, the valve body 92 is pushed to the right side in the drawing by the urging force of the coil spring 94 to supply fuel gas. The path U is closed (“closing operation”). Thus, the supply of the fuel gas to the main valve 87 and the gas burners 30 and 50 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 branched into two branches downstream of the main valve 87, and each gas outlet is connected to the gas burner main body 30 via the gas pipe 100, and is connected to the ignition burner 50 via the gas tube 110. Yes. 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 gas burner 31, and the other end 105 is connected to the mixing pipe 47 of the outer gas 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 gas burner body 30 and the ignition burner 50.

  The stove main body 20 of the gas stove 10 configured as described above has the five virtues 27 placed on the upper side of the gas burner main body 30, and a cooking utensil such as a pan is placed thereon to perform cooking by heating. It 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 gas burner main body 30 and the ignition burner 50 through the gas source, and a mixed gas (fuel gas and primary air is supplied from each flame outlet H formed in the gas burner main body 30 and the gas outlet of the pilot gas burner 50. Mixture) is ejected.

  On the other hand, when the operation knob 85 is operated, the igniter 55 (pressure booster) is activated to spark the spark plug 53. Thereby, the ignition burner 50 is ignited. Thereafter, the flame of the ignition burner 50 is transferred to a part of the flame outlet H of the outer gas burner 41 as shown in FIG.

  Then, the fire sequentially moves along the outer periphery of the outer gas burner 41 and ignites each flame outlet H. In addition, the fire moves to the flame port 65 of the auxiliary gas burner 61 attached to the front surface of the inner gas burner 31 through the slit 43.

  When the fire moves to the auxiliary gas burner 61, the fire moves to the inner gas burner 31 side via the auxiliary gas burner 61. Therefore, after that, the flames are sequentially transferred to each flame outlet H formed on the outer periphery of the inner gas burner 31. When both the outer gas burner 41 and the inner gas burner 31 make a round of fire transfer and all the flame outlets H are ignited, a series of ignition operations is completed.

  Further, when the auxiliary gas burner 61 is transferred to the fire, the flame formed in the flame openings 63 and 64 provided in the front heats the detection unit 73 of the thermocouple 70, so that the thermocouple 70 generates a thermoelectromotive force. Accordingly, thereafter, the electromagnet 98 is kept in an excited state. Therefore, the valve body 92 maintains the state of being pulled in the left direction in FIG. 7, and the safety valve 90 continues to open the fuel gas supply path U.

3. Function of the auxiliary gas burner 61 and the thermocouple 70 When the gas stove 10 disappears during cooking (for example, when the flame of the gas burner body 30 and the auxiliary gas burner 61 disappears due to spilling from the pan), the thermocouple 70 is not heated. It becomes a state and does not generate thermoelectromotive force. Therefore, the safety valve 90 operates, and the valve body 92 closes the fuel gas supply path U as shown in FIG. From the above, when the gas stove 10 is turned off, the supply of the fuel gas to the gas burner body 30 can be automatically stopped.

4). Description of Effect In the gas stove 10, the flame outlet 63 for detecting the disappearance is formed into a slit shape. Since the combustion gas is ejected from the slit-shaped flame outlet 63 while spreading radially, the extinction detection flame U has a radially spreading shape as shown in FIG. Even if the supply amount of the combustion gas is increased or decreased to increase or decrease the heating power on the gas burner main body 30 side, the flame U spreading radially does not change so much only by changing the spread. Therefore, it is possible to make the flame (the strength of the thermal power) hitting the thermocouple 70 constant regardless of the strength of the thermal power on the gas burner body 30 side.

  Therefore, since the thermocouple 70 is not subjected to excessive heating, the life of the thermocouple 70 can be extended. In addition, it is possible to make the flame hitting the thermocouple 70 constant (the strength of the thermal power), and further, the relative positional relationship between the thermocouple 70 and the auxiliary gas burner 61 is slightly shifted in the horizontal direction and the vertical direction in FIG. However, the thermocouple 70 cannot be removed from the flame U. Therefore, it is possible to detect the disappearance of the gas stove 10 with high accuracy.

  In the present embodiment, in addition to the slit-type flame mouth 63, a circular flame mouth 64 is provided below the flame-out detection flame mouth, but this is a combustion in addition to the slit-type flame mouth. It is an auxiliary flame opening for forming an auxiliary flame that stabilizes the flame, and it is possible to prevent floating of the flame by overlapping and burning each other.

  In the gas stove 10, since the auxiliary gas burner 61 is a separate member from the inner gas burner 31, the workability is better than when the flame outlet 63 for detecting the extinction is directly formed in the inner gas burner 31.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS.
In the first embodiment, as an example of the gas stove 10, a double type gas stove provided with double gas burners has been exemplified. The gas stove 200 according to the second embodiment is a single type gas burner. The basic structure of the gas stove 200 is the same as that of the gas stove 10 of the first embodiment except that the gas burner is single. The gas burner body 210, the mixing tube 237, the ignition burner (not shown), and then The auxiliary gas burner 261 to be described, the thermocouple 70, a gas cock device (not shown), and a stove main body (not shown) for housing them are provided.

  The auxiliary gas burner 261 is for detecting the extinction similarly to the auxiliary gas burner 61 of the first embodiment, and is constituted by a member different from the gas burner main body 210.

  The auxiliary gas burner 261 is made of brass, for example, and has a generally block shape as shown in FIG. The auxiliary gas burner 261 has a slit-type flame outlet 263 formed on the front wall. The slit-type flame outlet 263 extends in the horizontal direction and penetrates the front wall to the left and right. A gas passage (not shown) through which the flame port 263 communicates is formed inside the auxiliary gas burner 261. Further, a cylindrical attachment portion 268 is formed on the side wall of the auxiliary gas burner 261. In addition, the back wall (wall on the opposite side of the front wall) 269 of the auxiliary gas burner 261 is a separate member because of the processing of the gas passage.

  As shown in FIGS. 10 and 11, the auxiliary gas burner 261 is attached to the side surface side of the outer peripheral wall of the gas burner main body 210 via the attachment portion 268, and receives the supply of combustion gas from the gas burner main body 210 side to flame. The mouth 263 is configured to light a flame. A thermocouple 70 is vertically mounted on the front surface of the auxiliary gas burner 261 via a bracket BK 2, and the thermocouple tip detection unit 73 is heated by the flame U from the flame outlet 263.

  As described above, in the gas stove 200, as in the first embodiment, the flame outlet 263 for detecting the extinction is formed into a slit shape. Since the combustion gas is ejected radially from the slit-shaped flame opening 263, the flame U has a radially expanded shape as shown in FIG. Even if the supply amount of the combustion gas is increased / decreased to increase or decrease the heating power on the gas burner body 210 side, the flame U spreading radially does not change so much only by changing the spread. Therefore, it is possible to make the flame (the strength of the thermal power) hitting the thermocouple 70 constant regardless of the strength of the thermal power on the gas burner main body 210 side.

  Therefore, since the thermocouple 70 is not subjected to excessive heating, the life of the thermocouple 70 can be extended. Further, the flame hitting the thermocouple 70 can be made constant (the strength of the heating power), and the relative positional relationship between the thermocouple 70 and the auxiliary gas burner 261 is slightly shifted in the horizontal direction and vertical direction in the figure. However, the thermocouple 70 cannot be removed from the flame. Therefore, it is possible to detect the disappearance of the gas stove 200 with high accuracy.

  Further, since the auxiliary gas burner 261 is a separate member with respect to the gas burner main body 210, the workability is better than when the flame outlet 263 for detecting the extinction is formed directly on the gas burner main body 210.

  Although the auxiliary gas burner 261 of the second embodiment does not have a flame opening for transferring fire, this is because the gas burner main body 210 is a single type, and it is not necessary to transfer the flame between the two burners. It is.

  In the auxiliary gas burner 61 of the first embodiment, the auxiliary flame port 64 is formed below the slit-type flame port 63. However, in the auxiliary gas burner 261 of the second embodiment, the auxiliary flame port is eliminated. This is because the auxiliary gas burner 261 of the second embodiment does not form a flame port for fire transfer, and because the slit-type flame port 263 has a wide slit width, the momentum of the combustion gas to be ejected is different. This is because even if there is no mouth, the flame U lit to the slit-type flame mouth 263 is stabilized.

<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 said Embodiment 1, 2, the gas stove was illustrated as an example of a heating cooker. The scope of application of the present invention is not limited to a gas stove, but can also be applied to a pottery cooker that directly cooks food such as meat with a gas burner.

  (2) In the first and second embodiments, the screw fastening is illustrated as the attachment structure of the auxiliary gas burner with respect to the gas burner main body. However, other than that, it is possible to attach by, for example, brazing.

10. Gas stove (an example of the “heating cooker” of the present invention)
DESCRIPTION OF SYMBOLS 20 ... Stove body 30 ... Gas burner body 31 ... Inner gas burner 41 ... Outer gas burner 61 ... Auxiliary gas burner 63 ... Fire extinguishing detection flame 70 ... Thermocouple 80 ... Gas cock device 90 ... Safety valve P1, P2 ... Gas passage

Claims (2)

A gas burner body that heats an object to be heated by burning combustion gas supplied through a gas passage formed therein;
A thermocouple for detecting the disappearance of the gas burner body;
An auxiliary gas burner that is attached to the gas burner body and that heats the thermocouple by ejecting combustion gas branched from the gas burner body side from a flame outlet for detection of extinction,
A gas cock device provided with an electromagnetic safety valve that shuts off the supply of combustion gas to the gas burner body in response to the non-heated state of the thermocouple,
The heating cooker, wherein the auxiliary gas burner is a separate member from the gas burner body.   2. The cooking device according to claim 1, wherein the extinction detection flame mouth formed in the auxiliary gas burner has a slit shape.

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