JPH0197414A - Rice cooking and warm-keeping jar - Google Patents

Abstract

PURPOSE: To uniformly heat the entire surface at the time of the both of rice cooling and heat insulation only by a heat source at one place by making heat conduction from a heater to an inner pot by a heat pipe system. CONSTITUTION: An outer pot is constituted of a protective frame 13 and the bottom part 14, the protective frame 13 is a cylindrical heat pipe and is provided with a hollow double structure and the fluid 17 of a heating medium is enclosed in it. The fluid 17 is ethyl alcohol or fluorocarbon or the like, for instance, vaporized and elected at the time of being heated at a heating part in the enclosed protective frame, turned to the fluid again by radiating the heat at a low temperature part and circulated inside the protective frame 13. Heat from mica heaters 15 and 16 incorporated to the bottom part 14 of the outer pot is conducted from the bottom part to the inner pot 11 and transmitted from a side part to the inner pot 11 by the function of the heat pipe of the protective frame 13. Also, the heat from the protective frame 13 is transmitted from the part tightly adhered to a lid 12 of the protective frame 13 to the lid 12 of the inner pot and heating is uniformly performed through the protective frame 13 by the heat from the heater 16 for the heat insulation as well.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rice cooker and insulating jar, and in particular, has a heating structure that uniformly heats the inner pot from the heater using a heat pipe, and heats the inner pot from the entire surface of the inner pot. The present invention relates to a rice-cooking and warming jar that heats the rice uniformly.

[Conventional technology]

The rice-cooking and warming jars currently on the market are a combination of an electric rice cooker and a warming jar.

Such a rice-cooking and warming jar is provided with a heater at the bottom of the inner pot, and heating power is supplied to the heater to cook the rice. In order to keep the rice warm, a heat-retaining heater is provided on the lid of the inner pot or on the side of the inner pot, and the heat-retaining heater is used to keep the rice warm after cooking.

[Problem that the invention seeks to solve]

In such a rice-cooking/warming jar, the heater for cooking rice is installed at the bottom of the inner pot, and heating power is supplied to this heater to heat the rice from the bottom of the inner pot. The contents (water and rice) are heated to cook rice. In the early stages of cooking rice.

Even when heating from the bottom of the inner pot, the heat added by water convection is evenly applied to the rice due to the moisture in the inner pot, but in the later stages of cooking, the rice absorbs moisture and becomes less cooked. If there is less water in the inner pot, there will be no convection of water and the contents of the inner pot will not be heated evenly. For this reason, only the portion close to the heater is heated strongly, and in some cases, the rice may be burnt. In response to this, in the later stages of rice cooking, the heating power is reduced to prevent the rice from burning, but it is desirable to be able to heat the contents of the inner pot evenly.

By the way, in order to uniformly heat the contents of the inner pot, the heater, which is the heat source, should not be installed only at the bottom of the inner pot; for example, it should be installed so that it covers the entire surface of the inner pot. However, a heater with such a structure is complicated, expensive, and difficult to assemble, making it impractical for use in a rice cooker.

In addition, the rice cooking and warming jar is equipped with a warming heater in order to keep the cooked rice warm.

This heat-retaining heater is required to uniformly heat the rice content and keep it warm. For this reason, a heat-retaining heater is installed on the side of the inner pot or on the lid of the inner pot.
There was a problem in that the heat source was localized and uniform heating was not possible.

The present invention has been made to solve the above problems.

An object of the present invention is to provide a rice cooking/warming jar that can uniformly heat an inner pot for cooking rice and keeping it warm.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means for solving problems]

In order to achieve the above object, in the present invention, in a rice cooking/warming jar equipped with a heater, an inner pot, and an outer pot that houses the inner pot, heat is uniformly heated from the heater to the inner pot using a heat pipe. The main feature is that it has a heating structure that heats up to .

[Effect]

According to the above means, in a rice cooking/warming jar equipped with a heater, an inner pot, and an outer pot that houses the inner pot, the heating structure includes a heating structure that uniformly heats the inner pot from the heater using a heat pipe. be done.

For this reason, for example, the inner pot is made into a hollow double-walled structure in which a heating medium fluid is sealed. Alternatively, the outer pot may have a hollow double structure, and the heating medium fluid may be sealed inside. Alternatively, the outer pot is composed of a cylindrical protective frame and a bottom part, and the protective frame has a hollow double structure, and the heat medium fluid is sealed inside. In such a structure, the inner pot or the outer pot is configured to perform heat pipe type heat conduction, and heat conduction from the heater to the inner pot is performed by the heat pipe type.

Therefore, no matter where the heater is installed, the inner pot will be uniformly heated from the entire surface, and the heater can be installed at any position. therefore,
As for the installation position of the heat-retaining heater, it is not necessary to install it at the lid of the inner pot as in the conventional case, and even if it is installed at the bottom of the inner pot, the same effect can be obtained. For this reason, the structure of the lid portion of the rice-cooking and warming jar is also simple.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a rice cooking and warming jar according to a first embodiment of the present invention. In Fig. 1, 11 is an inner pot;
12 is the lid of the inner pot, and work 3 is a protective frame for storing the inner pot. 14 is the bottom of the protective frame 13, and the protective frame 13 and the bottom 14 constitute an outer pot. 15 is a mica heater for cooking rice, and 16 is a mica heater for cooking rice and keeping warm. Mica heaters 15 and 16 are used for cooking rice, and only mica heater 16 is used for keeping the rice warm. The protection frame 13 here is a cylindrical heat pipe. The structure is a hollow double structure in which a heat medium fluid 17 is sealed. This heating medium fluid 1
7 is, for example, ethyl alcohol, chlorofluorocarbon, etc., and when heated in the heated part (lower part) in the enclosed protective frame, it vaporizes and rises, and radiates heat in the low temperature part (upper part).
It becomes a fluid again and circulates inside the protective frame 13. As a result, heat transfer is performed with good thermal response in the protective frame having a heat pipe structure. 18 is a temperature sensor for controlling the rice cooking operation. Here, since the protective frame 13 of the outer pot consisting of the protective frame 13 and the bottom part 14 is used as a heat pipe, the heat generated from the mica heaters 15 and 16 built into the bottom part 14 of the outer pot is transferred to the inner pot 11 from the bottom. In addition to being conducted, due to the action of the heat pipe of the protective frame 13,
Heat is transferred to the inner pot 11 from the side. Further, the heat from the protective frame 13 of the heat pipe is transferred to the lid 12 of the inner pot from the upper portion of the protective frame 13 that is in close contact with the lid 12. Therefore, for keeping warm, the heat from the mica heater 16 for keeping warm provided at the bottom of the outer pot uniformly heats the pot through the protective frame 13 having a heat pipe structure.

Next, another embodiment of the present invention will be described. FIG. 2 is a sectional view of the left half of the rice cooking and warming jar according to the second embodiment of the present invention. In FIG. 2, 21 is an inner pot, 22 is a lid of the inner pot, 23 is an outer pot, and 25 is an embedded sheathed heater for both cooking and keeping the rice warm.

28 is a temperature sensor for controlling the rice cooking operation. Here, the outer pot 23 as a whole functions as a heat pipe. The structure is such that the outer pot itself has a hollow double structure, and a heat medium fluid 27 is sealed inside. In this second embodiment, the heater is a single embedded sheathed heater 25 that is used for both cooking rice and keeping warm. In addition, by simply placing the lid of the inner pot in close contact with the flange surface at the top of the outer pot with a heat pipe structure, heat from the sheathed heater 25 at the bottom can be transferred to the lid 2.
2, and there is no need to provide a special lid heater. In this way, the heat source only needs to be in one place, and this one
With one heat source, it is possible to heat the entire surface evenly during both cooking and keeping the rice warm.

Next, another embodiment of the present invention will be described. FIG. 3 is a sectional view of the left half of the rice cooking and warming jar according to the third embodiment of the present invention. In FIG. 3, 31 is an inner pot, 32 is a lid of the inner pot, 33 is a protective frame serving as an outer pot, and 35 is an embedded sheathed heater for both cooking and keeping the rice warm. 38 is a temperature sensor for controlling the rice cooking operation. Here, the inner pot 31 as a whole functions as a heat pipe. The structure is that the inner pot itself is a hollow double structure, and there is a heating medium fluid 37 inside.
is included. In this third embodiment, the heater is a single embedded sheathed heater that is used for both cooking rice and keeping the rice warm. Further, by simply bringing the lid 32 into close contact with the upper flange surface of the inner pot having a heat pipe structure, the heat generated from the sheathed heater 35 at the bottom is transmitted, and the heat can be kept evenly over the entire surface.

As described above, according to this embodiment, by using the heat pipe structure with good thermal response in the outer pot or the protective frame, and by using it in the inner pot itself, Since the heating from the heater to the inner pot is uniformly heated using a heat pipe, a rice cooking/warming jar with a power saving and highly efficient structure can be obtained.

Therefore, no matter where the rice-cooking and heat-keeping heaters are installed, the inner pot will be uniformly heated over the entire surface, and the heaters can be installed at any position. Therefore, there is no need to install the heater on the lid of the inner pot as in the past.
It may be provided at the bottom of the inner pot, and therefore the structure of the lid portion of the rice-cooking and warming jar can be simplified.

The present invention has been specifically explained above using examples, but
It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

〔Effect of the invention〕

As described above, according to the present invention, in a rice cooking/warming jar equipped with a heater, an inner pot, and an outer pot that covers the inner pot, heat conduction from the heater to the inner pot is conducted using a heat pipe method. This makes it possible to heat the entire surface uniformly, and with only one heat source, it is possible to uniformly heat the entire surface for cooking and keeping warm. Therefore, a lid heater for keeping warm is unnecessary, and a rice cooking/warming jar with a simple structure can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rice cooking and warming jar according to a first embodiment of the present invention. Fig. 2 is a sectional view of the left half of a rice-cooking/warming jar according to a second embodiment of the present invention, and Fig. 3 is a sectional view of the left half of a rice-cooking/warming jar according to a third embodiment of the present invention. be. In the figure, 11, 21. 31... Inner pot, 12, 22° 32
... Lid of inner pot, 13 ... Protective frame, 15 ... Mica heater for cooking rice, 16 ... Mica heater for cooking rice and keeping warm, 17, 27, 37 ... Heat medium fluid, 25゜3
5... A sheathed heater for cooking rice and keeping warm.

Claims (6)

[Claims] (1) A rice cooker equipped with a heater, an inner pot, and an outer pot that houses the inner pot, is characterized by a heating structure that uniformly heats the inner pot from the heater using a heat pipe. A rice-cooking and warming jar. (2) The heating structure for uniformly heating with a heat pipe is characterized in that the inner pot has a hollow double structure and a heating medium fluid is sealed inside the inner pot. The rice cooking jar mentioned above. (3) The heating structure for uniformly heating with a heat pipe is characterized in that the outer pot has a hollow double structure and a heating medium fluid is sealed inside. The rice cooking jar mentioned above. (4) The heating structure uses a heat pipe to heat the pot uniformly. The outer pot consists of a cylindrical protective frame and a bottom part, and the protective frame is replaced by two hollow
The rice-cooking/warming jar according to claim 1, characterized in that it has a layered structure in which a heat medium fluid is sealed. (5) Claims 1, 2, and 3, wherein the heater is an embedded sheathed heater.
or the rice-cooking/warming jar described in item 4. (6) The rice cooking and warming jar according to claim 1, 2, 3, or 4, wherein the heater is a mica heater.