JP2019083882A - Ih compatible cooker - Google Patents

Abstract

To provide an IH compatible cooker that is constituted of graphite, has a high-rate of temperature increase by induction heating and has a stable rate of temperature increase.SOLUTION: An IH compatible cooker 1 includes a heat generating member made of isotropic graphite. The heat generating member has an open porosity of 10% or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an IH-compatible cooking appliance.

  In recent years, the spread of IH cookers using induction heating (IH) has progressed. In order to cook using an IH cooker, it is necessary to use an induction heating possible cooking appliance. For example, Patent Document 1 discloses a pan made of graphite as an induction heating cooker.

Japanese Patent Application Laid-Open No. 9-75211

  Graphite pots are known to have a higher heating rate by induction heating than metal pots. However, in recent years, with the rising awareness of energy saving, in order to enable cooking for a short time, further improvement of the temperature rising rate is required.

  In addition, it is known that even if it is used under the same conditions, there may be variations in the heating rate even if it is used under the same conditions, and in applications that require precise and fine temperature control such as a rice cooker The stability of the temperature rising rate is also required together with the improvement of the temperature rising rate.

  The main object of the present invention is to provide an IH-compatible cooking appliance which is made of graphite, has a high temperature rise rate by induction heating, and a stable temperature rise rate.

  The IH-compatible cooking appliance according to the present invention includes a heat generating member made of isotropic graphite. The open porosity of the heat generating member is 10% or more. For this reason, the IH corresponding | compatible cooking appliance which concerns on this invention has a high temperature increase rate. Moreover, the variation in the temperature rising rate of the IH-compatible cooking appliance according to the present invention is narrow, and the temperature rising rate is stable.

  In the present invention, "isotropic graphite" refers to graphite having an anisotropic ratio of 1.1 or less.

  In the present invention, the term "heat generating member" means a portion which is inductively heated and heated when under the influence of a magnetic field.

  In the IH-compatible cooking appliance of the present invention, the open porosity of the heat-generating member is more preferably 15% or more and 18% or less.

  The IH-compatible cooking appliance according to the present invention may further include a coating film covering at least a part of the surface of the heat generating member.

  In the IH-compatible cooking appliance of the present invention, the heat generating member may be an appliance body.

  The IH-compatible cooking appliance according to the present invention may further include an appliance body, and the heat generating member may be attached to the appliance body.

  According to the present invention, it is possible to provide an IH-compatible cooking appliance which is made of graphite, has a high temperature rise rate by induction heating, and has a stable temperature rise rate.

It is a typical sectional view of an IH corresponding cooking appliance concerning a 1st embodiment. It is a schematic cross section of the IH corresponding | compatible cooking appliance which concerns on 2nd Embodiment. It is a graph showing the relationship between the open porosity of samples 1-4 produced in Examples 1-4, and the required time to reach 250 degreeC.

  Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiments are merely illustrative. The present invention is not at all limited to the following embodiments.

First Embodiment
FIG. 1 is a schematic cross-sectional view of an IH-compatible cooking appliance 1 according to the present embodiment.

  Specifically, the IH-compatible cooking appliance 1 shown in FIG. 1 is a pan. In the present invention, "cooking utensils" include dishes such as dishes, cups and trays in addition to pots, inner pots for rice cookers, frying pans and the like.

  The IH-compatible cooking appliance 1 includes an appliance body 10 made of isotropic graphite as a heat generating member. Here, isotropic graphite is graphite which is molded by isostatic pressing or the like, and is graphite having an isotropic structure / characteristic with an anisotropic ratio of 1.1 or less.

  As a result of intensive studies, the present inventors have found that, when the open porosity is in a specific range, the temperature rising rate at the time of induction heating correlates with the open porosity of isotropic graphite. . Specifically, when the open porosity was in a specific range, it was found that the higher the open porosity of isotropic graphite, the higher the temperature rising rate at the time of induction heating.

  In the cooking appliance 1 for IH according to the present embodiment, the open porosity of the isotropic graphite-made appliance body 10 is 10% or more. Therefore, the IH-compatible cooking appliance 1 has a high temperature rise rate. Although the reason is that it is not clear, the open pores possessed by the isotropic graphite instrument body 10 have a narrow distribution of the pore diameters and many open pores having a narrow distribution of the pore diameters such as 10% or more. It is thought that the speed is high.

  From the viewpoint of achieving a higher temperature increase rate, the open porosity of the device body 10 is preferably 12% or more, and more preferably 15% or more. However, if the open porosity of the device body 10 is too high, the strength of the IH-compatible cooking device 1 may be lowered, or the temperature rising rate may vary. Therefore, the open porosity of the device body 10 is preferably 20% or less, and more preferably 18% or less.

  In addition, the open porosity of the instrument main body 10 can be measured by a mercury intrusion method using micromeritics (model number; Auto Pore IV MIC-9500) manufactured by Shimadzu Corporation.

  In the present embodiment, an example in which the tool body 10 constitutes the heat generating member has been described. However, in the present invention, the tool main body does not necessarily have to be constituted by the heat generating member. In the present invention, the portion to be inductively heated when under the influence of a magnetic field may be constituted by a heat generating member made of isotropic graphite having an open porosity of 10% or more. In the present invention, the IH-compatible cooking device may further include other members in addition to the device body made of graphite. For example, the IH-compatible cooking appliance 1 according to the present embodiment includes the appliance body 10 and the coating film 20 covering at least a part of the surface of the appliance body 10. As the coating film 20, a ceramic film, a fluorine resin film, etc. are mentioned, for example. When the IH-compatible cooking device 1 is, for example, a clay pot, the outer surface of the IH-compatible cooking device 1 may be coated with a ceramic film, and the inner surface may be coated with a fluorine resin film.

(Production method)
Next, an example of the manufacturing method of the IH corresponding | compatible cooking appliance 1 is demonstrated.

  First, a binder such as pitch is added to an aggregate such as coke, and the mixture is kneaded and pulverized. Thereafter, the kneaded material is formed. Next, the molded product is fired and graphitized to prepare a graphite block. In order to ensure the uniformity of the characteristic of the block obtained, it is preferable to perform molding by cold isostatic pressing. Next, the IH-compatible cooking device 1 can be manufactured by cutting out the graphite block into a desired shape.

  In addition, in the open porosity, kneading is performed so that aggregate having a large average particle diameter and aggregate having a small average particle diameter are used in combination, or aggregate having a large average particle diameter and an aggregate having a small average particle diameter are produced. By crushing the material, it is possible to control by the aggregate having a small average particle size entering the gaps between the aggregate having a large average particle size during molding. The open porosity can also be controlled by impregnating the pitch or changing the impregnating conditions such as the pressure at the time of impregnating the pitch and the number of times of impregnation.

Second Embodiment
FIG. 2 is a schematic cross-sectional view of an IH-compatible cooking appliance according to a second embodiment.

  In the first embodiment, the example in which the heat generating member main body is configured by the instrument main body has been described. However, the present invention is not limited to this configuration.

  For example, an IH-compatible cooking appliance 1a according to the second embodiment shown in FIG. 2 includes, for example, an appliance body 10a which is not induction heated such as a clay pot, and a heat generating member 30 attached to the appliance body 10a. The heat generating member 30 is a member made of isotropic graphite having an open porosity of 10% or more. Also in the IH-compatible cooking appliance 1a, since the heat generating member 30 is constituted by a member made of isotropic graphite having an open porosity of 10% or more, high temperature rise by induction heating as in the IH-compatible cooking appliance 1 Speed and narrow variations in the heating rate can be realized.

  In addition, the IH corresponding | compatible cooking appliance 1a which concerns on 2nd Embodiment may further have a coating film etc. similarly to the IH corresponding | compatible cooking appliance 1 which concerns on 1st Embodiment.

  EXAMPLES Hereinafter, the present invention will be described in more detail based on specific examples, but the present invention is not limited to the following examples at all, and the present invention is appropriately modified without changing the gist of the present invention. It is possible.

Example 1
A graphite binder obtained by adding a pitch binder to coke having a large average particle diameter and coke having a small average particle diameter, kneading and crushing, performing cold isostatic pressing, firing and graphitizing The disk of φ124.5 × 3 mm was cut out to prepare Sample 1. The open porosity of the produced sample 1 was 17%, and the anisotropic ratio was 1.05.

(Example 2)
A pitch binder is added to coke having a large average particle diameter and coke having a small average particle diameter and kneaded, so that particles of a kneaded material having a large average particle diameter and particles of a kneaded material having a small average particle diameter are produced. The sample 2 was produced at the same process as Example 1 except having crushed. The open porosity of the produced sample 2 was 16%, and the anisotropic ratio was 1.05.

(Example 3)
A sample 3 was produced in the same manner as in Example 1 except that pitch pressure impregnation was carried out after firing, and graphitization was carried out after firing again. The open porosity of sample 3 produced was 13%, and the anisotropic ratio was 1.05.

(Example 4)
A sample 4 was produced in the same manner as in Example 3 except that the step of impregnating the pitch and firing again was performed twice. The open porosity of the produced sample 4 was 11%, and the anisotropic ratio was 1.05.

(Comparative example)
The sample 5 was produced at the same process as Example 1 except having used coke of a fixed particle diameter, and having carried out extrusion molding. The open porosity of the produced sample was 20%, and the anisotropic ratio was 1.25.

(Open porosity)
The open porosity of each of the samples 1 to 5 prepared in each of the examples 1 to 4 and the comparative example was measured by a mercury intrusion method using micromeritics manufactured by Shimadzu Corporation (model number: Auto Pore IV MIC-9500). The results are shown in Table 1.

(Time to reach 250 ° C)
The required time to reach 250 ° C. is achieved by heating samples 1 to 5 prepared in each of Examples 1 to 4 and Comparative Example using an IH cooker (“PH-33” manufactured by Panasonic Corporation) having an output of 1400 W. It was measured. The results are shown in Table 1 and FIG.

   As for the samples 1 to 4 of Examples 1 to 4, the required time to reach 250 ° C. was measured three times, and the same time was obtained each time. On the other hand, in the comparative example using anisotropic graphite, as a result of measuring the required time to reach 250 ° C. three times, it dispersed for every measurement, such as 100 seconds, 85 seconds, and 90 seconds. From this result, it is understood that the variation in heating rate can be suppressed by using isotropic graphite.

  In addition, samples 1 to 4 of Examples 1 to 4 using an isotropic graphite and having an open porosity of 10% or more have a required time to reach 250 ° C. as compared with Sample 5 of a comparative example not using isotropic graphite. It was short. From this result, it is understood that by setting the open porosity to 10% or more using isotropic graphite, it is possible to increase the temperature rising rate by induction heating.

1, 1a IH-compatible cookware 10, 10a Apparatus body 20 Coating film 30 Heat generating member

Claims (5)

Equipped with a heat generating member made of isotropic graphite,
The IH corresponding cooking appliance whose open porosity of the said heat-generating member is 10% or more.   The IH-compatible cooking appliance according to claim 1, wherein an open porosity of the heat-generating member is 15% or more and 20% or less.   The IH-compatible cooking appliance according to claim 1, further comprising a coating film covering at least a part of the surface of the heat generating member.   The IH-compatible cooking device according to any one of claims 1 to 3, wherein the heat generating member is a device body.   The IH-compatible cooking appliance according to any one of claims 1 to 3, further comprising an appliance body, wherein the heat generating member is attached to the appliance body.

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