JP2007215945A - Gas rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas rice cooker, provided with a gas burner 14 including a circular burner head to heat the bottom 20 of an inner pot 2 of ceramic, and a temperature sensor 15 abutting on the bottom 20 at an upper area of a center part of the burner head in the gas burner 14, the bottom 20 having a circular inner rib 21 surrounding an abutment part to the temperature sensor 15, and outer projecting ribs 22 positioned on the outer side of the inner rib 21, in such a way that the outer side of the inner rib 21 at the bottom 20 is heated by flames F of the gas burner, in which generation of yellow tips due to contact of the flames F generated by the gas burner 14 with the outer ribs 22 is reduced so as to improve burning performance of the gas burner 14, and prevent inconvenience of attachment of soot to the bottom 20. <P>SOLUTION: A plurality of the outer ribs 22 are provided around the inner rib 21, and they are extended from the outer circumference of the inner rib 21 outward. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gas rice cooker, and more particularly to a gas rice cooker having a ceramic inner pot.

  In order to cook cooked rice deliciously, the ideal heating pattern is to heat the kettle at low heat first, then boil and evaporate the water at once with high heat, and finally steam the cooked rice sufficiently. In this way, sugar and free amino acids such as glucose and sucrose increase during the initial low heat heating, resulting in sweetness and umami that are characteristic of cooked rice. Can be cooked.

  The heating pattern is easily reproduced by using a ceramic pot. Since ceramic has a large heat capacity and low thermal conductivity, it is excellent in heat retention.When rice is cooked using a ceramic pot, the rice grains are not easily transferred to the pot at the initial stage of cooking, and the rice grains are heated to low heat. Then, the rice grains are heated strongly and the water boils and evaporates all at once. Finally, the cooked rice is fully steamed in a ceramic pot with a large heat capacity. Thereby, rice cooking of an ideal heating pattern can be performed.

Under such background, recently, a gas rice cooker having a ceramic inner pot having a large heat capacity and a low thermal conductivity has appeared. As such a gas cooker, the one shown in FIG. 3 is known.
In this, the ceramic inner pot (2) is detachably dropped into the rice cooker body (11) whose upper open end is covered with an outer lid (10) so as to be opened and closed. The upper open end of (2) is closed by an inner lid (13) attached to the outer lid (10). The inner pot (2) is heated by the gas burner (14) disposed below the inner pot (2), and the temperature of the inner pot (2) that rises with the heating is the temperature that abuts the bottom (20). Monitored by sensor (15).

As shown in FIG. 4, an annular reinforcing inner rib (21) and outer rib (22) are formed concentrically on the bottom (20) of the inner hook (2). The distortion is prevented when the inner pot (2) is baked by baking in a kiln.
In this case, when the inner pot (2) is attached to the rice cooker body (11), the temperature sensor (15) is placed inside the inner rib (21) formed on the bottom (20) as shown in FIG. While abutting, the outside of the inner rib (21) at the bottom (20) is heated by the flame (F).
JP-A-8-266404

  However, in the above conventional one, as shown in FIG. 3, the tip of the flame (F) generated by the gas burner (14) is entirely on the outer rib (22) formed near the outer periphery of the bottom (20). It will be in the state blocked | interrupted by contacting over the circumference | surroundings, and combustion conditions will deteriorate. Accordingly, a reddish yellow portion (yellow tip) in which carbon is incandescent is generated in the flame (F), and the combustibility is lowered. Further, there is a problem that the carbon component of the yellow tip becomes soot and adheres to and accumulates in the vicinity of the outer rib (22), and the bottom (20) is contaminated with soot.

The present invention has been made in view of such points,
`` A gas burner (14) having an annular burner head for heating the bottom (20) of the ceramic inner pot (2);
The gas burner (14) comprises a temperature sensor (15) that comes into contact with the bottom (20) in the upper region of the central part of the burner head,
An annular inner rib (21) surrounding the contact portion of the temperature sensor (15) and an outer rib (22) positioned outside the inner rib (21) project from the bottom (20). And
In the gas cooker where the outside of the inner rib (21) at the bottom (20) is heated by the flame (F) of the gas burner (14), the ceramic inner pot (2) is fired. In addition to preventing distortion of the bottom (20) of the gas burner (14), the flame (F) of the gas burner (14) is less likely to cause yellow chips due to contact with the outer rib (22). An object is to improve the combustibility, thereby preventing the inconvenience of the sticking to the bottom (20).

[Invention of Claim 1]
The solution means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
“A plurality of the outer ribs (22) are provided around the inner rib (21) and extend outward from the outer periphery of the inner rib (21)”.
According to the above solution, each outer rib (22) is set in a shape extending outward from the outer periphery of the inner rib (21). Therefore, the outer rib (22) is formed over the entire circumference to the flame (F) from the gas burner (14) as in the conventional case described above in which the outer rib (22) is formed concentrically with the inner rib (21). Are not in contact with each other and are unlikely to become an obstacle to combustion. Thereby, it is possible to prevent the combustion conditions of the gas burner (14) from deteriorating and to reduce the occurrence of yellow chips.
In addition, since there are a plurality of outer ribs (22) extending outward from the outer periphery of the inner rib (21), the deformation strength of the bottom (20) is increased when the inner pot (2) is baked by baking the base. .

[Invention of Claim 2]
In the invention according to claim 1,
In the case where “the outer rib (22) extends linearly from the outer periphery of the inner rib (21)”, the flow direction of the combustion exhaust gas generated in the gas burner (14) (in the bottom (20) And the direction in which the outer rib (22) extends coincides with the outer rib (22), so that the outer rib (22) does not become the flow resistance of the combustion exhaust. Therefore, the combustibility of the gas burner (14) is further improved.

[Invention of Claim 3]
In the invention according to claim 1 or 2,
“The diameter of the flame alignment circle connecting the flame holes formed in the burner head (140) is 65 mm to 70 mm,
The inner rib (21) has a diameter of 45 mm to 55 mm,
The distance from the burner head (140) to the bottom of the hook (20) is set to about 50 mm, respectively. "In the above-described conventional inner hook (2), a 60 mm diameter inner rib (21 ), The inner rib (21) approaches the circumferential side of the temperature sensor (15). Therefore, the temperature sensor (15) tends to be hidden behind the inner rib (21) against the flame (F) generated by the gas burner (14), and the inner rib (21) functions as a heat insulating wall. Therefore, even if the flame (F) fluctuates during combustion of the gas burner (14), the heat of the flame (F) is prevented from directly acting on the temperature sensor (15), and the temperature sensor (15) The temperature of 2) can be detected accurately.

[Invention of Claim 4]
In the invention according to claims 1 to 3,
“The height of the inner rib (21) is set to be larger than 4 mm and equal to or smaller than 10 mm” The invention has the following effects.
That is, when the height of the inner rib (21) is 4 mm or less, the distortion preventing function of the bottom (20) when firing the inner pot (2) is weak. On the other hand, if the height exceeds 10 mm, the inner surface (20a) of the bottom of the pot rises along the inner rib (21), and the inner surface (20a) of the bottom of the hook is not smooth.
Therefore, in the invention according to claim 4, in order to obtain a smooth inner surface (20a) while reliably preventing distortion of the bottom (20) during firing, the height of the inner rib (21) is 4 mm. It was set larger and 10 mm or less.
Also, by providing a high inner rib (21), the temperature sensor (15) tends to be hidden behind the inner rib (21), so that the heat of the flame (F) is directly applied to the temperature sensor (15). It is prevented from acting on.

The present invention has the following specific effects.
In the invention according to claim 1, as described above, the occurrence of yellow chips can be reduced, so that the gas burner is compared with the conventional one in which the annular outer rib (22) is formed on the bottom (20). The combustibility of (14) is improved, and the inconvenience that the soot adheres to the bottom (20) and is contaminated is prevented.
In addition, since there are a plurality of outer ribs (22) extending outward from the outer periphery of the inner rib (21), the deformation strength of the bottom (20) is increased when the inner pot (2) is baked by baking the substrate. Distortion of the bottom (20) during firing is prevented.

  In the invention according to claim 2, since the outer rib (22) has a shape that linearly extends radially from the outer periphery of the inner rib (21), the flow direction of the combustion exhaust gas generated by the gas burner (14) and the outer rib Since the extending direction of (22) coincides, and the outer rib (22) does not become the flow resistance of the combustion exhaust gas, the combustibility of the gas burner (14) is further improved.

  According to the invention of claim 3, as described above, the heat of the flame (F) is prevented from directly acting on the temperature sensor (15), and the temperature sensor (15) Temperature can be detected accurately. Therefore, it is possible to prevent the gas burner (14) from prematurely cutting before the completion of cooking.

  In the invention according to claim 4, since the height of the inner rib (21) is set to be larger than 4 mm and not larger than 10 mm, as described above, the distortion of the bottom (20) during firing is surely prevented. On the other hand, a smooth inner surface (20a) of the bottom of the pot can be obtained, and the heat of the flame (F) is prevented from directly acting on the temperature sensor (15), so that accurate temperature detection can be performed. Thereby, it can contribute to prevention of premature cutting of the gas burner (14) at the time of cooking rice. In particular, in the invention of claim 3, when the invention specific matter of claim 4 is limited, the tall inner rib (21) comes close to the temperature sensor (15), so the flame of the gas burner (14) ( The heat of F) becomes more difficult to act on the temperature sensor (15), and more accurate temperature detection can be performed.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the rice cooker body (11) is configured in the same manner as the conventional one described above, and the upper end open part is covered with an outer lid (10) so as to be freely opened and closed. The base end portion is supported by the support shaft (16) so as to be rotatable up and down. In addition, the rotating tip of the outer lid (10) is held closed by the lock button (17), while the inner lid that closes the upper end opening of the inner hook (2) on the lower surface of the outer lid (10). (13) is attached.

Below the inner body (12) provided in the rice cooker body (11) is an annular burner head (140) whose diameter (the diameter of the flame hole alignment circle connecting each flame hole (a)) is set to 70 mm. A gas burner (14) is provided, and a temperature sensor (15) that contacts the center of the bottom (20) of the inner pot (2) is located above the center of the burner head (140). ing.
The inner pot (2) is configured so as to be detachable into the inner body (12) of the rice cooker body (11).

  As shown in FIG. 2 (a perspective view looking up from below), the body portion (23) of the inner hook (2) is formed in a cylindrical shape, and an annular shape is formed at the center of the bottom (20). The inner rib (21) is raised, and linear outer ribs (22) and (22) extending radially from the outer periphery of the inner rib (21) are arranged in the circumferential direction at intervals of 120 degrees. The inner pot (2) is formed of a ceramic material obtained by firing a base material mixed with petalite.

  In the present embodiment, the height of the inner rib (21) and the outer rib (22) is set to 6 mm, and is set to a dimension higher than the conventional rib height of 4 mm. The widths of the inner rib (21) and the outer rib (22) are set to the same 2.5 mm as described above. The diameter of the inner rib (21) formed in an annular shape (diameter at the center of the rib width) is set to 50 mm (60 mm for the conventional one described above), and a temperature sensor (15) having a diameter of 23 mm is set inside the inner rib (21). Is supposed to enter. The length of the outer rib (22) is set to 45 mm.

  As shown in FIG. 1, the vertical cross-sectional shape of the region connecting the barrel (23) of the inner hook (2) to the flat hook bottom (20) is an arc-shaped portion (18). 18) The area inside the lower end is the bottom (20). The diameter of the bottom (20) is set to 135 mm, and the outer diameter of the body (23) is set to 210 mm. In the present embodiment, the distance from the bottom (20) to the burner head (140) is set to about 50 mm.

Moreover, the outer peripheral flange (24) engaged from the upper end with the upper-end periphery of the inner trunk | drum (12) of the rice cooker main body (11) protrudes from the upper end of the trunk | drum (23) of an inner pot (2).
Since the outer rib (22) is formed radially, it also functions as a hook foot when the inner hook (2) is placed on a sink or the like.
In this case, when the gas burner (14) is burned in the state of FIG. 1 with the inner pot (2) attached to the rice cooker body (11), the flame (F) generated in the burner head (140) of the gas burner (14) ) Heats the outer region of the inner rib (21) at the bottom (20). In this case, the outer ribs (22) and (22) have a shape that linearly extends radially from the outer periphery of the inner rib (21). Therefore, the outer rib (22) is formed over the entire circumference to the flame (F) from the gas burner (14) as in the conventional case described above in which the outer rib (22) is formed concentrically with the inner rib (21). Are not in contact with each other and are unlikely to become an obstacle to combustion. Thereby, the deterioration of the combustion conditions of the gas burner (14) can be prevented, the generation of yellow chips can be reduced, and the combustibility of the gas burner (14) is improved.

  Further, as indicated by the arrow (A) in FIG. 2, the flow direction of the high-temperature combustion exhaust gas generated from the gas burner (14) coincides with the direction in which the outer rib (22) extends, so that the outer rib (22) is the combustion exhaust gas. On the other hand, the combustibility of the gas burner (14) is further improved.

  In this embodiment, the inner bottom (20) of the inner hook (2) is provided with an annular inner rib (21) and a radial outer rib (22). The deformation strength of the pot bottom (20) when firing) is increased. This prevents distortion of the bottom (20) during the firing. In particular, in the present embodiment, the height of the inner rib (21) etc. is set to 6 mm, so that the inner surface (20a) of the bottom of the hook does not rise along the inner rib (21) etc. as described above. In addition, a smooth inner surface (20a) of the bottom can be obtained, and the heat of the flame (F) of the gas burner (14) is prevented from directly acting on the temperature sensor (15), so that accurate temperature detection is possible. Yes.

  In the above embodiment, the diameter of the inner rib (21) is set to 50 mm. Therefore, the inner rib (21) approaches the circumferential side of the temperature sensor (15) as compared with the case where the inner rib (21) having a diameter of 60 mm formed in the conventional inner hook (2) is employed. Therefore, as described in the operation of the invention according to claim 3 described above, even if the flame (F) fluctuates during combustion of the gas burner (14), the heat of the flame (F) is directly applied to the temperature sensor (15). The temperature sensor (15) can accurately detect the temperature of the inner pot (2).

[Others]
1. In the above embodiment, the three outer ribs (22) and (22) are arranged in the circumferential direction at intervals of 120 degrees. However, if two or more outer ribs (22) and (22) are provided, the above-described embodiment Actions and effects almost the same as those of can be obtained.
2. The outer rib (22) may have a wave shape extending outward from the inner rib (21) or other curved shape.

3. The height of the inner rib (21) and the outer rib (22) is not limited to 6 mm, but is almost the same as the above embodiment as long as it is larger than 4 mm and not larger than 10 mm. Is obtained.
If the height of the inner rib (21) or outer rib (22) is large, the inner surface (20a) of the bottom of the hook rises along the inner rib (21) and the like to obtain a smooth inner surface (20a) of the bottom. The reason is not possible for the following reasons. That is, at the time of firing the inner pot (2), the firing proceeds from the portion where the thickness of the bottom (20) is thin (the portion where the inner rib (21) etc. does not exist) and the firing progresses in the process of shrinking. Since the slow thick part (the part where the inner rib (21) etc. exists) is pulled, the inner surface (20a) of the bottom of the inner rib (21) and the outer rib (22) is recessed. Therefore, if the height of the inner rib (21) or the outer rib (22) is large, the thickness change due to the location of the bottom (20) increases, and the degree of firing progress varies depending on the location of the bottom (20). Thus, the dent is also noticeable. However, it has been experimentally confirmed that the degree of the depression is within an allowable range when the height of the inner rib (21) and the outer rib (22) is suppressed to 10 mm or less. Moreover, if there are many outer ribs (22) etc., the bottom face (20a) of the bottom of the hook will become smoother.

4). In the above embodiment, the burner head of the gas burner (14) is set to 70 mm and the diameter of the inner rib (21) is set to 50 mm, but the diameter of the burner head (140) is set to 65 mm to 70 mm. Even if it is set and the diameter of the inner rib (21) is set to 45 mm to 55 mm, substantially the same operation and effect as in the above embodiment can be obtained. In this case, if the height of the inner rib (21) and the outer rib (22) is set to a dimension larger than 4 mm and not larger than 10 mm, the same operation and effect as described above can be obtained.

Sectional drawing of the rice cooker which concerns on embodiment of this invention The perspective view of the inner pot (2) integrated in the rice cooker which concerns on embodiment of this invention Cross-sectional view of a conventional rice cooker Perspective view of the inner pot (2) incorporated in the conventional rice cooker

Explanation of symbols

(2) ・ ・ ・ Inner pot
(14) ・ ・ ・ Gas burner
(15) ・ ・ ・ Temperature sensor
(20) ...
(21) ・ ・ ・ Inner rib
(22) ・ ・ ・ Outer rib
(140) ... Burner head

Claims (4)

A gas burner (14) having an annular burner head for heating the bottom (20) of the ceramic inner pot (2);
The gas burner (14) comprises a temperature sensor (15) that comes into contact with the bottom (20) in the upper region of the central part of the burner head,
An annular inner rib (21) surrounding the contact portion of the temperature sensor (15) and an outer rib (22) positioned outside the inner rib (21) project from the bottom (20). And
In the gas rice cooker in which the outside of the inner rib (21) at the bottom (20) is heated by the flame (F) of the gas burner (14),
A plurality of the outer ribs (22) are provided around the inner rib (21), and have a shape extending outward from the outer periphery of the inner rib (21). In the gas rice cooker according to claim 1,
The gas cooker, wherein the outer rib (22) extends linearly from the outer periphery of the inner rib (21). In the gas rice cooker according to claim 1 or claim 2,
The diameter of the flame hole circle connecting the flame holes formed in the burner head (140) is 65 mm to 70 mm,
The inner rib (21) has a diameter of 45 mm to 55 mm,
A gas cooker in which the distance from the burner head (140) to the bottom (20) is set to about 50 mm. In the gas rice cooker according to any one of claims 1 to 3,
A gas cooker in which the height of the inner rib (21) is set to be greater than 4 mm and 10 mm or less.

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