JP2022080570A - Gas rice cooker - Google Patents

Abstract

To provide a gas rice cooker even when something abnormal occurs in operation of a safety device, capable of reliably stopping the heating by a gas burner.SOLUTION: A gas rice cooker includes an energizing spring upward energizing a hollow contact body coming into contact with a bottom part of a rice cooking pot, a thermosensitive part located on a top face of the contact body or a rear face thereof and formed of a thermosensitive material whose magnetic permeability drops when a temperature thereof exceeds a prescribed Curie temperature, and a permanent magnet vertically movably stored in the contact body. Accordingly, if only the Curie temperature of the thermosensitive part is set to an appropriate temperature, the permanent magnet is magnetized to the thermosensitive part until the rice cooking of the rice cooking pot is completed, however, once the rice cooking is completed, the temperature of the thermosensitive part increases to cause the permanent magnet magnetized to the thermosensitive part to fall, so that a safety device is actuated to stop the heating of a gas burner. Further, the rice cooking part includes a thin wall part formed on the bottom part by thinning the thickness of the bottom part around a contact position with which the contact body comes into contact.SELECTED DRAWING: Figure 2

Description

The present invention relates to a gas rice cooker having a rice cooker and a gas burner that heats the bottom of the rice cooker from below.

A gas cooker that cooks rice by burning fuel gas with a gas burner is known. In this gas cooker, a rice cooker is placed on a ring-shaped gas burner, and the rice cooker is heated from below to cook rice. Further, in the center of the gas burner, a contact body forming a part of the safety device is projected. The abutting body is formed in a cylindrical shape having a top surface and is urged upward by a spring. When the rice cooker is placed on the gas burner, the top surface of the contact body comes into contact with the bottom surface of the rice cooker by the force of the spring.

Further, a heat-sensitive portion made of heat-sensitive ferrite is mounted on the top surface of the abutting body in a state of being in contact with the back surface side of the top surface. Here, heat-sensitive ferrite is a ferromagnetic material on which a magnet is magnetized at room temperature, but when it exceeds a predetermined temperature called the Curie temperature, the magnetic permeability drops sharply and the magnet changes to a normal magnetic material that is not magnetized. Have. Further, a permanent magnet is mounted inside the abutting body so as to be movable in the vertical direction.

The safety device of the gas cooker operates as follows. First, when the user places the rice cooker on the gas burner, the top surface of the contact body, which is urged upward by the spring, comes into contact with the bottom of the rice cooker. However, in this state, the permanent magnet inside the abutting body is located at a lower position away from the heat-sensitive portion. From that state, when the user presses the rice cooking button, the gas valve built in the gas cooker opens and the gas burner starts burning the fuel gas. In addition, the movement of pushing down the rice cooking button is transmitted to the permanent magnet inside the abutment body via the safety lever, and as a result of pushing up the permanent magnet inside the abutment body, it is mounted on the back surface side of the top surface of the abutment body. A permanent magnet is magnetically attached to the heat-sensitive part.

Even after the rice is cooked in this way, the water in the rice cooker will boil while the rice is being cooked, so the temperature at the bottom of the pot will not rise above the specified Curie temperature, but the water that will boil when the rice is cooked. The temperature of the bottom of the pot rises and exceeds the Curie temperature. Then, the magnetic permeability of the heat-sensitive portion of the abutting body decreases, the permanent magnet cannot be magnetized to the heat-sensitive portion, and the weight of the permanent magnet is applied to the safety lever. As a result, the safety lever is pushed down by the weight of the permanent magnet, the rice cooking button returns to the position before cooking rice, and with this movement, the gas valve closes and the combustion of fuel gas in the gas burner stops. (Patent Document 1).

Japanese Unexamined Patent Publication No. 7-289425

However, in the above-mentioned conventional gas cooker, if the permanent magnet magnetically attached to the heat-sensitive part is caught inside the abutting body and an abnormality occurs in the operation of the safety device, the weight of the permanent magnet becomes a safety lever. There was a problem that it was not possible to stop the combustion of the fuel gas in the gas burner because it was not added.

The present invention has been made to solve the above-mentioned problems in the prior art, and is a gas capable of stopping the combustion of fuel gas in the gas burner even when an abnormality occurs in the operation of the safety device. The purpose is to provide a rice cooker.

In order to solve the above-mentioned problems, the gas cooker of the present invention adopts the following configuration. That is,
In a gas cooker having a rice cooker and a gas burner that heats the bottom of the rice cooker from below.
A hollow abutting body that abuts from below on the bottom of the rice cooker,
An urging spring that urges the abutting body toward the bottom of the rice cooker,
A permanent magnet provided so as to be movable in the vertical direction inside the abutting body,
A heat-sensitive portion provided on the top surface of the abutting body or the back surface side of the top surface and formed of a heat-sensitive material whose magnetic permeability decreases when a predetermined Curie temperature is exceeded is provided.
The bottom of the rice cooker is characterized in that a thin portion having a thin bottom is formed so as to surround the contact position where the contact body abuts.

In the gas rice cooker of the present invention, the contact body is in contact with the bottom of the rice cooker from below, and the contact body is urged upward by the urging spring. The contact body has a hollow shape, and a heat-sensitive portion made of a heat-sensitive material whose magnetic permeability decreases when a predetermined Curie temperature is exceeded is provided on the top surface or the back surface side of the top surface of the contact body. A permanent magnet is housed inside the abutting body so as to be movable in the vertical direction. Therefore, if the Curie temperature of the heat-sensitive part is set to an appropriate temperature, the permanent magnet is magnetically attached to the heat-sensitive part until the rice cooking in the rice-cooking kettle is completed. When the temperature rises, the permanent magnet magnetized on the heat-sensitive part falls, the safety device is operated, and the heating by the gas burner can be stopped. Here, at the bottom of the rice cooker of the gas cooker of the present invention, a thin portion having a thin bottom is formed so as to surround the contact position where the contact body abuts.

By doing this, even if the permanent magnet that is no longer magnetized to the heat-sensitive part does not fall due to being caught inside the abutting body and the safety device cannot be operated, the safety device can be operated as follows. It is possible to operate and stop heating. That is, if the gas burner continues to heat the rice cooker even after the rice cooker is completed, the temperature of the rice cooker rises. Further, since the contact body that comes into contact with the bottom of the rice cooker from below is urged upward by the urging spring, the bottom of the rice cooker is in a state where the contact position of the contact body is pushed up. Then, on the bottom of the rice cooker, a thin portion having a thin bottom is formed so as to surround the contact position. For this reason, as the temperature of the rice cooker rises, the bottom of the rice cooker eventually breaks at the thin-walled part, and a part of the bottom (the part surrounded by the thin-walled part) together with the abutting body, It is pushed up by the force of the urging spring. The movement of the abutting body eliminates the catching of the permanent magnet inside the abutting body, and as a result of the permanent magnet falling, it becomes possible to operate the safety device and stop the heating by the gas burner.

Further, in the gas rice cooker of the present invention described above, a thin portion at the bottom may be formed by forming a groove from below in the bottom of the rice cooker.

By doing so, a thin-walled portion can be easily formed by forming a groove in the bottom portion. Further, if the groove is formed from the lower part of the bottom, the inner surface side of the rice cooker can be left flat, so that the cooked rice does not get into the groove and become difficult to take.

Further, in the gas rice cooker of the present invention described above, the thin portion at the bottom of the rice cooker may be formed at the following positions. First, the gas burner is formed in an annular shape, and the abutting body is erected at a position inside the inner diameter of the gas burner, and the top surface of the abutting body is brought into contact with the bottom of the rice cooker. Then, the thin portion at the bottom of the rice cooker may be formed at a position inside the outer diameter of the gas burner.

The rice cooker usually has a peripheral wall extending upward from the peripheral edge of the bottom. The peripheral wall of this rice cooker continues to be heated by the gas burner even after the rice is cooked, and when the temperature of the bottom of the rice cooker becomes high, the peripheral wall of the rice cooker extending upward from the peripheral edge of the bottom is the heat sink. It will perform its function. Therefore, the temperature of the bottom of the rice cooker near the peripheral wall is less likely to rise. Therefore, if the thin-walled portion at the bottom of the rice cooker is formed at a position inside the outer diameter of the gas burner, the influence of heat dissipation on the peripheral wall is reduced, and the temperature of the thin-walled portion can be raised. It is possible to reliably break the bottom part with a thin-walled part.

Further, in the gas rice cooker of the present invention described above, the thin portion at the bottom of the rice cooker may be formed at a position inside the inner diameter of the gas burner.

The thin portion at the bottom of the rice cooker is formed so as to surround the contact position where the contact body abuts. Therefore, when the total length of the thin-walled portion becomes long, the force of the contact portion pushing up the bottom portion is dispersed, and it becomes difficult for the thin-walled portion to break the bottom portion even if the temperature of the bottom portion rises. From this, if the thin-walled portion at the bottom of the rice cooker is formed at a position inside the inner diameter of the gas burner, the overall length of the thin-walled portion can be suppressed, so that the bottom portion is surely broken at the thin-walled portion. It becomes possible.

It is explanatory drawing which shows the rough structure of the gas cooker 1 of this Example. It is sectional drawing which shows the detailed internal structure of the gas cooker 1 of this Example. It is sectional drawing which shows the internal structure of the safety device 30 mounted on the gas cooker 1. It is explanatory drawing which shows the position of the rice cooking button 6 and the safety lever 36 at the time of rice cooking. It is sectional drawing which shows the internal state of the safety device 30 at the time of cooking rice. It is a perspective view which showed the shape of the lower surface of the rice cooker 10 of this Example. In the gas rice cooker 1 of this embodiment, it is explanatory drawing which shows the reason why the combustion of a fuel gas can be surely stopped even if an abnormality occurs in a safety device 30. In the gas rice cooker 1 of this embodiment, it is explanatory drawing which shows the reason why the combustion of a fuel gas can be surely stopped even if an abnormality occurs in a safety device 30. It is explanatory drawing about the rice cooker 10 of a modification.

FIG. 1 is an explanatory diagram showing a rough structure of the gas cooker 1 of the present embodiment. The gas cooker 1 of this embodiment has a structure in which a cylindrical upper frame portion 3 is placed on a cylindrical lower frame portion 2 and a rice cooker 10 is housed in the upper frame portion 3 from above. It has become. The rice cooker 10 is formed by casting or forging using a lightweight metal material having high thermal conductivity (for example, aluminum).

The lower frame portion 2 is a member formed into a bottomed cylindrical shape by pressing a sheet metal, and a gas burner 20 is housed inside the lower frame portion 2. Further, a ring-shaped juice tray 4 is fitted on the upper surface of the lower frame portion 2, and the burner head 21 on the upper portion of the gas burner 20 protrudes from the hole 4a in the center of the juice saucer 4. There is. The burner head 21 is a ring-shaped member, and a plurality of flame openings are formed on the outer peripheral side surface, and the contact body 31 protrudes from the central through hole 21a. As will be described later, the contact body 31 forms a part of the safety device mounted on the gas cooker 1.

Further, a gas connecting portion 5 and a rice cooking button 6 are attached to the side surface of the lower frame portion 2. By connecting a gas hose (not shown) to the gas connection portion 5, it is possible to supply fuel gas to the gas burner 20, and when the rice cooking button 6 is pressed down, the gas burner 20 starts burning the fuel gas. ..

FIG. 2 is a cross-sectional view showing a detailed internal structure of the gas cooker 1 of this embodiment. The rice cooker 10 includes a cylindrical peripheral wall 10a and a disk-shaped bottom portion 10b that closes one end side of the peripheral wall 10a, and the peripheral wall 10a has a flange portion 10c formed by expanding the diameter of the upper end portion of the peripheral wall 10a. There is. Further, a plurality of legs 11 are projected downward near the outer edge of the lower surface of the bottom portion 10b, and a cylindrical convex portion 12 is projected downward in the center of the lower surface of the bottom portion 10b. Has been done. Further, a circular groove portion 13 is formed on the lower surface of the bottom portion 10b so as to surround the convex portion 12. Since the thickness of the bottom portion 10b is thin at the portion where the groove portion 13 is bored, the groove portion 13 of the present embodiment is one aspect of the "thin wall portion" in the present invention. Further, the upper frame portion 3 for accommodating the rice cooker 10 is formed with a ring-shaped mounting surface 3a by bending the upper end portion inward. The rice cooker 10 is housed in the upper frame portion 3 by placing the flange portion 10c on the mounting surface 3a of the upper frame portion 3.

Inside the lower frame portion 2, a burner body 22 forming a part of the gas burner 20, a gas supply valve 7 for supplying fuel gas to the gas burner 20, a safety device 30 described later, and the like are housed. The burner body 22 is an annular member formed by combining sheet metal members, and a central passage 22a is formed in the center so as to penetrate in the vertical direction. Further, the burner body 22 has a double structure, and in the space between the sheet metal member forming the central passage 22a and the sheet metal member on the outside thereof, a ring-shaped mixing chamber surrounding the central passage 22a is provided. 22b is formed.

A ring-shaped juice tray 4 is placed on the upper end of the lower frame portion 2, and the upper portion of the burner body 22 protrudes from the hole 4a opened in the center of the juice tray 4. A burner head 21 forming a part of the gas burner 20 is placed on the upper portion of the burner body 22. The burner head 21 is formed in an annular shape, and when the burner head 21 is placed on the burner body 22, the through hole 21a formed in the center of the burner head 21 is continuous with the central passage 22a of the burner body 22. It will be in the state of. Further, a plurality of flame openings 21b are opened on the outer peripheral side surface of the burner head 21, and the mixing chamber 22b formed inside the burner body 22 is in a state of communicating with the outside through the flame openings 21b. The groove portion 13 formed on the lower surface of the rice cooker 10 is formed at a position inside the through hole 21a of the burner head 21 when the rice cooker 10 is housed in the upper frame portion 3. The reason for this will be described later.

Further, the gas supply valve 7 is connected to the gas connection portion 5 (see FIG. 1) by a gas pipe (not shown). Further, the gas supply valve 7 is connected to an injection nozzle (not shown), and fuel gas can be injected from the injection nozzle toward the mixing pipe (not shown) of the burner body 22. Therefore, when the gas supply valve 7 is opened, the fuel gas supplied from the gas hose is injected from the injection nozzle toward the mixing pipe via the gas connection portion 5 and the gas supply valve 7, and the fuel is injected together with the air. The gas flows into the mixing tube and mixes with the air inside the mixing tube. The fuel gas mixed with the air inside the mixing pipe in this way flows into the mixing chamber 22b of the burner body 22 and then flows out from the flame port 21b. By igniting the fuel gas flowing out from the flame port 21b in this way, it becomes possible to start the combustion of the fuel gas.

The safety device 30 of the gas cooker 1 is mounted in the central passage 22a of the burner body 22. The safety device 30 includes an abutting body 31 mounted in the central passage 22a, an urging spring 32 that urges the abutting body 31 upward, and a spring support 33 that supports the urging spring 32 from below. , A base 34 to which the spring support base 33 is attached is provided. The contact body 31 is urged upward by the urging spring 32 in a state where the rice cooker 10 is not housed in the upper frame portion 3, but when the rice cooker 10 is housed in the upper frame portion 3, the contact body 31 is urged upward. As shown in FIG. 2, the rice cooker 10 is pushed down by the convex portion 12.

Further, as will be described later, the abutting body 31 has a hollow inside, and a permanent magnet to be described later is accommodated in the space inside the abutting body 31 so as to be movable in the vertical direction. The safety device 30 also includes a rod 35 for moving the permanent magnet in the vertical direction, and a safety lever 36 formed in an L shape and to which the rod 35 is attached to the tip. The safety lever 36 is pivotally supported by a support shaft 36a on the side opposite to the side to which the rod 35 is attached, and in the state before cooking rice, the rod 35 is in a lowered state as shown in FIG. However, when the rice cooking button 6 is pushed down, the safety lever 36 rotates about the support shaft 36a, thereby pushing up the rod 35 upward. This point will be explained in detail later.

FIG. 3 is a cross-sectional view showing the internal structure of the safety device 30. In FIG. 3, parts other than the safety device 30 are indicated by thin broken lines. As shown in the figure, the contact body 31 of the safety device 30 has a bottomed cylindrical shape, and a disk-shaped lid portion 31a is attached to the upper end thereof. The outer diameter of the lid portion 31a is formed to be larger than the outer diameter of the contact body 31, and the urging spring 32 abuts on the lower surface of the lid portion 31a protruding from the outer peripheral side surface of the contact body 31. The contact body 31 is urged upward. Further, inside the contact body 31, a heat-sensitive portion 31b made of heat-sensitive ferrite is attached at a position at the center of the lower surface of the lid portion 31a. Further, a pair of guide shafts 31c are attached to the positions on both sides of the heat-sensitive portion 31b inside the abutting body 31 in a state of hanging from the lower surface of the lid portion 31a.

Further, a magnet holder 38 is slidably attached to the inside of the abutting body 31 with respect to the guide shaft 31c, and a permanent magnet 37 is attached to the magnet holder 38. As shown in FIG. 3, flange portions 38a are projected on both sides of the magnet holder 38, and through holes (not shown) are formed in each of the flange portions 38a. A guide shaft 31c is inserted into the through hole of each flange portion 38a. Since the inner diameter of the through hole is formed to be larger than the shaft diameter of the guide shaft 31c, the magnet holder 38 and the permanent magnet 37 move in the vertical direction inside the contact body 31 while being guided by the guide shaft 31c. Can be done. Further, the magnet holder 38 is attached to the tip of the rod 35, and the rod 35 is attached to the tip of the safety lever 36.

Before the user starts cooking rice, the rice cooking button 6 is in the raised position as shown in FIG. In this state, the safety lever 36 is in a state of rotating around the support shaft 36a in the direction in which the rod 35 is lowered (clockwise in the drawing). Therefore, as shown in FIG. 3, inside the contact body 31, the magnet holder 38 and the permanent magnet 37 are in a state of moving downward. After that, when the user of the gas cooker 1 starts cooking rice, the rice cooker button 6 is pressed down. Then, the movement is transmitted to the gas supply valve 7, the gas supply valve 7 is opened, the fuel gas is supplied to the gas burner 20, and rice cooking is started. Further, when the rice cooking button 6 is pressed down, the movement is transmitted to the safety lever 36 to rotate the safety lever 36.

FIG. 4 is an explanatory diagram showing a state in which the safety lever 36 is rotated by pressing down the rice cooking button 6 during rice cooking. As shown, when the rice cooking button 6 is pushed down, the safety lever 36 rotates about the support shaft 36a, and as a result, the rod 35 (see FIG. 3) attached to the tip of the safety lever 36 abuts. It is pushed up inside 31. When the rice cooking button 6 is pressed down, a flame due to combustion of fuel gas is formed in the flame port 21b of the burner head 21. In FIG. 4, the flame formed in the flame opening 21b is indicated by a alternate long and short dash line.

FIG. 5 is a cross-sectional view showing the internal state of the safety device 30 when the rice cooking button 6 is pressed down (that is, when cooking rice). When the rice cooking button 6 is pushed down, the rod 35 is pushed up by the safety lever 36 as shown, so that the magnet holder 38 attached to the tip of the rod 35 is guided by the guide shaft 31c to the contact body 31. Move up inside. As a result, the permanent magnet 37 attached to the magnet holder 38 approaches the heat-sensitive portion 31b attached to the lower surface of the lid portion 31a and magnetizes.

Here, the heat-sensitive portion 31b is formed of heat-sensitive ferrite. As is well known, heat-sensitive ferrite is a ferromagnetic material that magnetizes magnetism at room temperature, but when it exceeds a predetermined temperature called Curie temperature, the magnetic permeability drops sharply and the magnet changes to a normal magnetic material that does not magnetize. have. Further, the Curie temperature of the heat-sensitive portion 31b is set to a temperature higher than the boiling point of water. Therefore, while the water in the rice cooker 10 is boiling during rice cooking, the temperature of the heat-sensitive portion 31b is kept near the boiling point, so that the permanent magnet 37 is magnetically attached to the heat-sensitive portion 31b.

When the rice cooking is completed and there is no boiling water in the rice cooker 10, the temperature of the heat-sensitive portion 31b begins to rise beyond the boiling point and eventually exceeds the Curie temperature of the heat-sensitive portion 31b, so that the permanent magnet 37 is used as the heat-sensitive portion. It will not be magnetized to 31b. Then, the weights of the permanent magnet 37 and the magnet holder 38 are applied to the rod 35 and the safety lever 36, and the safety lever 36 rotates in the direction in which the rod 35 is lowered (clockwise in FIGS. 4 and 5). Then, by such movement of the safety lever 36, the rice cooking button 6 is pushed up to the original position, the gas supply valve 7 which has been opened is closed, and the supply of fuel gas to the gas burner 20 is stopped. As a result, the combustion of the fuel gas stops. Further, in accordance with the movement of the safety lever 36, inside the contact body 31, the magnet holder 38 (and the permanent magnet 37) moves downward while being guided by the guide shaft 31c, and is shown in FIG. It returns to the state before the start of rice cooking.

However, it is safe if the magnet holder 38 is caught inside the abutting body 31 (for example, the inner surface of the abutting body 31 or the guide shaft 31c) while the magnet holder 38 is being guided and moved by the guide shaft 31c. The lever 36 and the rice cooking button 6 cannot be returned to their original positions. As a result, the gas supply valve 7 cannot be closed, and the combustion of the fuel gas in the gas burner 20 cannot be stopped. Therefore, in the gas rice cooker 1 of the present embodiment, even if the magnet holder 38 is caught inside the contact body 31, the rice cooker can stop the combustion of the fuel gas in the gas burner 20. A groove portion 13 is formed on the lower surface of the bottom portion 10b of 10.

FIG. 6 is a perspective view showing the shape of the groove portion 13 formed on the lower surface of the bottom portion 10b of the rice cooker 10. In FIG. 6, the rice cooker 10 is displayed in an upside-down state. As shown in the figure, a cylindrical convex portion 12 is projected from the center of the bottom portion 10b of the rice cooker 10. A groove portion 13 having a shape (circular in FIG. 6) surrounding the convex portion 12 is formed around the convex portion 12. If the groove portion 13 is formed around the convex portion 12 in this way, even if the magnet holder 38 is caught inside the abutting body 31, the fuel gas is burned in the gas burner 20 as follows. Can be stopped.

FIG. 7 is an explanatory diagram showing the reason why the combustion of the fuel gas in the gas burner 20 can be stopped even when the magnet holder 38 is caught inside the abutting body 31. FIG. 7 shows a state in which the rotation of the safety lever 36 is stopped halfway because the magnet holder 38 is caught inside the contact body 31. Since the safety lever 36 and the rice cooking button 6 have not returned to their original positions, the gas supply valve 7 cannot be closed, and the gas burner 20 continues to burn the fuel gas. Therefore, the temperature of the bottom portion 10b of the rice cooker 10 gradually rises. Then, as shown in FIG. 6, since the groove portion 13 is formed around the convex portion 12 in the bottom portion 10b of the rice cooker 10, the bottom portion 10b is thinned in the groove portion 13 and is also convex. The portion 12 is pushed up by the force of the urging spring 32. Therefore, as the temperature of the bottom portion 10b rises, the bottom portion 10b eventually breaks at the groove portion 13 and the convex portion 12 moves upward by the force of the urging spring 32. FIG. 7 shows a state in which the convex portion 12 is moved upward by the urging spring 32.

Further, in order to break the bottom portion 10b of the rice cooker 10 at the groove portion 13, the position where the groove portion 13 is formed in the bottom portion 10b may be a position inside the outer diameter of the burner head 21. desirable. More preferably, as in the rice cooker 10 of the present embodiment (see FIG. 2), it is desirable to form the groove portion 13 at a position inside the inner diameter of the burner head 21 (that is, inside the through hole 21a). .. The reason for this is as follows.

In FIG. 7, the flame due to the combustion of the fuel gas is indicated by a long-dotted line. As shown in the figure, the position where the flame burns the bottom portion 10b of the rice cooker 10 is a position outside the outer diameter of the burner head 21. Therefore, at first glance, the temperature of the bottom portion 10b is highest at the position where the flame is roasted, and this position (that is, the position outside the outer diameter of the burner head 21) is the optimum position for forming the groove portion 13. Seems to be. However, in a situation where the peripheral wall 10a exists on the outer periphery of the rice cooker 10 and the temperature is so high that the bottom portion 10b breaks at the groove portion 13, the peripheral wall 10a functions as a strong heat radiating plate. Therefore, considering the influence of heat dissipation by the peripheral wall 10a, it is desirable that the position where the groove portion 13 is formed is inside the outer diameter of the burner head 21 rather than outside the outer diameter of the burner head 21.

In addition, in a situation where the bottom portion 10b is hot enough to break at the groove portion 13, the position of the flame is on the inner diameter side of the burner head 21 as compared with the normal state (that is, the state during rice cooking). It will spread toward you. The reason for this is that when the temperature of the bottom portion 10b becomes high, the combustion speed of the fuel gas increases, so that the flame traces the flow of the secondary air. As a result, since the flame enters inside the outer diameter of the burner head 21, the temperature of the groove portion 13 becomes sufficiently high even if the groove portion 13 is formed inside the outer diameter of the burner head 21, and the groove portion 13 is formed. It is possible to break the bottom portion 10b.

Further, the force for breaking the groove portion 13 of the bottom portion 10b is a force for the urging spring 32 to push up the convex portion 12, and the force for the urging spring 32 is not so large. Therefore, when the peripheral length of the groove portion 13 becomes long, the force of the urging spring 32 is dispersed, and it becomes difficult to break the bottom portion 10b at the groove portion 13. Therefore, the position of the groove portion 13 formed in the bottom portion 10b is outside the convex portion 12, but it is more desirable if the position is inside the inner diameter of the burner head 21 (that is, inside the through hole 21a).

As described above, when the bottom portion 10b breaks at the portion of the groove portion 13, the convex portion 12 moves upward by the force of the urging spring 32. Along with this, the contact body 31 pushed down by the convex portion 12 also moves upward (see FIG. 7). Then, the magnet holder 38 is not caught inside the contact body 31, and the magnet holder 38 (see FIG. 5) can be dropped. As a result, as shown in FIG. 8, the safety lever 36 is pushed down by the rod 35 to return to the state before cooking rice, and accordingly, the rice cooking button 6 also returns to the position before cooking rice and the gas supply valve 7 is closed. Then, it becomes possible to stop the combustion of the fuel gas. As described above, in the gas rice cooker 1 of the present embodiment, even if the magnet holder 38 is caught inside the abutting body 31 after the rice cooking is completed, the bottom portion 10b of the rice cooker 10 is broken at the position of the groove portion 13. By moving the contact body 31 upward, the catching can be eliminated. As a result, the safety lever 36 can be returned to the original position, and the combustion of the fuel gas can be reliably stopped. Further, since the groove portion 13 is formed in the lower surface of the bottom portion 10b, the upper surface side of the bottom portion 10b is flat. Therefore, the cooked rice does not enter the groove portion 13.

In the gas rice cooker 1 of the present embodiment described above, it is assumed that the groove portion 13 is formed in the bottom portion 10b of the rice cooker 10. However, it is sufficient if the portion where the thickness of the bottom portion 10b is reduced is formed so as to surround the convex portion 12, and it is not always necessary to form the groove portion 13. For example, as illustrated in FIG. 9, a thin-walled portion 14 having a thin bottom portion 10b may be formed around the convex portion 12. Even in this way, when the temperature of the bottom portion 10b rises abnormally, the bottom portion 10b is broken at the portion of the thin-walled portion 14 and the convex portion 12 is pushed up. It is possible to reliably stop the combustion of fuel gas.

Although the gas cooker 1 of the present embodiment and the modified example has been described above, the present invention is not limited to the above-mentioned embodiment and the modified example, and may be carried out in various embodiments without departing from the gist thereof. It is possible.

For example, in the above-mentioned Examples and Modifications, it has been described that the heat-sensitive portion 31b made of heat-sensitive ferrite is attached to the lower surface of the lid portion 31a of the contact body 31, but the lid portion 31a is formed by the heat-sensitive ferrite. You may. In this case, the lid portion 31a also serves as the heat sensitive portion 31b.

1 ... gas cooker, 2 ... lower frame, 3 ... upper frame, 3a ... mounting surface,
4 ... Juice saucer, 4a ... Hole, 5 ... Gas connection, 6 ... Rice cooking button,
7 ... gas supply valve, 10 ... rice cooker, 10a ... peripheral wall, 10b ... bottom,
10c ... Flange part, 11 ... Leg part, 12 ... Convex part, 13 ... Groove part,
14 ... thin part, 20 ... gas burner, 21 ... burner head,
21a ... through hole, 21b ... flame mouth, 22 ... burner body,
22a ... Central passage, 22b ... Mixing room, 30 ... Safety device,
31 ... contact body, 31a ... lid, 31b ... heat sensitive part,
31c ... guide shaft, 32 ... urging spring, 33 ... spring support,
34 ... base, 35 ... rod, 36 ... safety lever,
36a ... Support shaft, 37 ... Permanent magnet, 38 ... Magnet holder,
38a ... Flange portion.

Claims (4)

In a gas cooker having a rice cooker and a gas burner that heats the bottom of the rice cooker from below.
A hollow abutting body that abuts from below on the bottom of the rice cooker,
An urging spring that urges the abutting body toward the bottom of the rice cooker,
A permanent magnet provided so as to be movable in the vertical direction inside the abutting body,
A heat-sensitive portion provided on the top surface of the abutting body or the back surface side of the top surface and formed of a heat-sensitive material whose magnetic permeability decreases when a predetermined Curie temperature is exceeded is provided.
A gas rice cooker characterized in that a thin portion having a thin bottom is formed on the bottom of the rice cooker so as to surround the contact position where the contact body abuts. In the gas cooker according to claim 1,
The thin-walled portion of the bottom of the rice cooker is a gas rice cooker having a groove formed in the bottom of the rice cooker from below. In the gas cooker according to claim 1 or 2.
The gas burner is formed in an annular shape and has an annular shape.
The contact body is erected at a position inside the inner diameter of the gas burner.
A gas rice cooker characterized in that the thin portion of the bottom of the rice cooker is formed at a position inside the outer diameter of the gas burner. In the gas cooker according to claim 3,
A gas rice cooker characterized in that the thin portion of the bottom of the rice cooker is formed at a position inside the inner diameter of the gas burner.

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