JP4702022B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker that uses steam to cook rice, or a rice cooker with a heat retention function that performs rice cooking and heat insulation.

  Conventionally, there exist rice cookers that cook rice using superheated steam (see, for example, Patent Document 1).

FIG. 5 shows a conventional rice cooker that cooks rice using typical superheated steam. As shown in FIG. 5, a pot 32 in the rice cooker body 31, a heating plate 33 for sealing the pot 32, a heating means 34 for heating the pot 32, a steam generating means 35, a steam generating means 35 and a pot 32. And a steam pipe 36 communicating with each other. The steam generating means 35 is composed of a water tank 37 and a water tank heating means 38. A heating plate heating means 39 for heating the heating plate 33 is fixed to the lid 40.
Japanese Patent No. 3518544

  However, in the conventional example, since the steam temperature is increased by using a part of the heating plate, it is difficult to keep the steam temperature uniform and high. Moreover, the temperature distribution of the heating plate is not uniform, and the surface of the rice is dried by the radiant heat from the high temperature portion of the heating plate, so that the taste is lowered. Moreover, since the steam inlet hole is only a part of the heating plate, it is difficult for high temperature steam to reach the whole rice. Moreover, it had the subject that it was not possible to confirm whether steam was actually generated from the steam generating means during rice cooking.

  The present invention solves the above-mentioned problem, and a plurality of steam discharge holes are provided in the inner lid at approximately equal distances from the steam inlet to the steam heating space, the temperature distribution of the heating plate is uniform, and the superheated steam is distributed over the rice. The purpose is to provide a rice cooker that uses superheated steam that is easy to reach.

In order to solve the above-mentioned problems, a rice cooker according to the present invention comprises a detachable pan, a lid covering the pan, an inner lid provided on the pan side of the lid, and steam generating means for generating steam. A steam heating space configured to store steam, the induction heating type steam heating means for heating the steam heating space, the steam generation means, and the induction A steam path communicating with the heating steam heating means; and a control means for controlling the steam generating means and the steam heating means, the steam heating means including an induction heating coil provided on an inner lower surface of the bottom plate of the lid; The inner lid is configured with a plurality of vapor discharge holes in the inner lid that are symmetrical with respect to an axis passing through the steam inlet to the steam heating space and the center of the inner lid and equidistant from the steam inlet in the circumferential direction. A sheet having thermal conductivity on the bottom plate of the lid Sandwiched therebetween is provided with a said induction heating coil.

  The rice cooker of this invention can comprise the rice cooker using the superheated steam with which the temperature distribution of a heating plate is uniform and superheated steam is easy to spread over the whole rice.

The first invention includes a detachable pan, a lid covering the pan, an inner lid provided on the pan side of the lid, steam generating means for generating steam, and an inner lid on the inner lid upper side. A steam heating space configured by a lid and a bottom plate of the lid to store steam, induction heating type steam heating means for heating the steam heating space, the steam generation means and the induction heating type steam heating means are connected in communication A steam path, a control means for controlling the steam generation means and the steam heating means, the steam heating means comprising an induction heating coil provided on the inner lower surface of the lid and the inner lid, and the steam heating space A sheet having a plurality of steam discharge holes in the inner lid that is symmetrical with respect to an axis passing through the steam inlet and the center of the inner lid and equidistant from the steam inlet in the circumferential direction, and having a thermal conductivity in the bottom plate of the lid The induction heating coil is installed across the This makes it possible to configure a rice cooker that uses superheated steam that has a uniform temperature distribution on the inner lid and overheated steam that easily spreads over the entire rice. It is possible to prevent the steam cooled in step 1 from remaining as water droplets.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of a rice cooker according to the first embodiment of the present invention. In FIG. 1, the lid | cover 2 which covers the upper surface is installed in the main body 1 of the rice cooker so that opening and closing is possible. The storage portion 3 of the main body 1 includes an upper frame 4 on the upper side and a coil base 5 on the lower side. The inner pot 6 stored in the storage unit 3 is formed of a magnetic material such as stainless steel or iron. The inner pan 6 has a flange protruding outward at the upper end opening, and is detachably accommodated in the accommodating portion 3 by placing the flange on the upper end of the upper frame 4. The inner pan 6 has a gap between the inner pot 6 and the storage portion 3 when stored. An induction heating coil 7 for inductively heating the inner pot 6 is disposed at a portion of the coil base facing the bottom of the inner pot 6. The induction heating coil 7 is a winding having a center substantially directly below the center of the bottom of the inner pot 6. When the inner pot 6 is stored, the temperature detecting means 8 comes into contact with the bottom surface of the inner pot 6. A steam generating means 11 comprising a heating container heating means 9 and a heating container 10 is provided at the rear part of the main body 1. The lid 2 includes a steam heating space 13 surrounded by the bottom plate 2 a and the inner lid 12, and the steam generating means 11 and the steam heating space 13 are communicated with each other by a steam path 14. An intermediate portion of the vapor path 14 is composed of a light transmissive member 15, and a light source 16 is installed below the light transmissive member 15. A part of the light transmissive member 15 above the light source 16 is a window 17 penetrating the lid 2.

  The inner lid 12 can be attached to and detached from the bottom plate 2a. When the inner lid 12 is attached to the bottom plate 2a, the outer peripheral packing 18 and the inner peripheral packing 19 are in close contact with the inner lid, and the steam heating space 13 is formed. An induction heating coil 20 for heating the inner lid is provided on the bottom plate 2a. The connection packing 21 provided at the tip of the steam path 14 is connected to the upper end of the heating container 10 when the lid 2 is closed. Inside the main body 1, a control means 23 comprising a control board 22a and an operation board 22b is provided. A microcomputer (not shown) is mounted on the control board 22a. The microcomputer controls the current for generating an alternating magnetic field in the induction heating coil 7 by software. Further, the steam generating means 11 and the inner lid heating induction heating coil 20 are controlled. An inner lid temperature detection sensor 24 is provided so as to penetrate the bottom plate 2a and come into contact with the inner lid 12. As shown in FIG. 2, by providing a plurality of steam discharge holes 26 in the inner lid 12 at approximately equal distances from the steam inlet 14a to the steam heating space 13, the temperature distribution of the inner lid 12 is uniform, and the high temperature steam It is easy to spread all over the rice. A coating 25 having thermal conductivity is provided on the surface of the induction heating coil 20 for heating the inner lid. The steam generated by the steam generating means 11 becomes superheated steam in the steam heating space 13 and is ejected from the steam discharge hole 26 to the inner pan 6. At this time, heat is radiated from the bottom plate 2a, and when superheated steam disappears in the steam heating space 13, dew condensation adheres to the inner surface of the bottom plate 2a. The surface of the induction heating coil 20 for heating the inner lid is coated with a heat conductive coating 25 to transmit the self-heating of the induction heating coil 20 for heating the inner lid to the bottom plate 2a, thereby preventing condensation on the inner surface of the bottom plate 2a. To do. With the above configuration, when steam is passing through the steam path, steam condenses inside the lid-side window and light appears to scatter, and steam is actually generated from the steam generating means during rice cooking. Can be confirmed. 3A shows a state of the window 17 when no steam is generated, and B shows a state of the window 17 during the generation of steam. Further, by transmitting the self-heating of the induction heating coil 20 for heating the inner lid to the bottom plate 2a, condensation on the inner surface of the bottom plate 2a is prevented.

  FIG. 4 shows a plan view of the main body 1 having a configuration different from that described above. In FIG. 4, the middle of the vapor path 14 is constituted by a light transmissive member 15, and a light source 16 is installed at a portion protruding into the light transmissive member 15. A part of the light transmissive member 15 above the light source 16 is a window 17 penetrating the lid 2. The induction heating coil 20 for heating the inner lid is fixed on the bottom plate 2a with a sheet 27 having thermal conductivity interposed therebetween. With the above configuration, when steam is passing through the steam path, steam condenses inside the lid-side window and light appears to scatter, and steam is actually generated from the steam generating means during rice cooking. Can be confirmed. Further, the self-heating of the inner lid heating induction heating coil 20 is transmitted to the bottom plate 2a by the heat conductive sheet 27 to prevent condensation on the inner surface of the bottom plate 2a. Similarly, in the configuration in which the induction heating ring 28 is fixed to the bottom plate 2a instead of the sheet 27 having thermal conductivity, the heat of the induction heating ring 28 is transmitted to the bottom plate 2a to prevent condensation on the inner side surface of the bottom plate 2a. it can. Further, even in a configuration in which the protrusion 12a provided on the inner lid 12 is in contact with the lower surface inside the bottom plate 2a of the lid 2, heat from the inner lid 12 can be transmitted to the bottom plate 2a to prevent condensation on the inner surface of the bottom plate 2a. it can.

  As described above, the rice cooker according to the present invention has a uniform temperature distribution of the inner lid, and high-temperature steam easily spreads over the whole rice, so that it can be applied to uses such as a cooker.

Sectional drawing of the rice cooker in Embodiment 1 of this invention. The same plan view Cross section of the rice cooker Sectional view of rice cooker with the same configuration Sectional drawing which shows the conventional rice cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 6 Inner pan 11 Steam generating means 12a Protrusion 13 Steam heating space 14 Steam path 15 Light-transmitting member 16 Light source 20 Inner lid heating induction heating coil 25 Thermally conductive coating 26 Steam exhaust hole 27 Thermal conductivity Sheet 28 with induction heating ring

Claims (1)

A detachable pan, a lid covering the pan, an inner lid provided on the pan side of the lid, steam generating means for generating steam, the inner lid on the inner lid, and a bottom plate of the lid A steam heating space configured to store steam, induction heating steam heating means for heating the steam heating space, a steam path for connecting the steam generation means and the induction heating steam heating means, and A steam generating means and a control means for controlling the steam heating means, the steam heating means comprising an induction heating coil provided on the inner lower surface of the lid and the inner lid, and a steam inlet to the steam heating space; A plurality of steam discharge holes are provided in the inner lid that are symmetrical with respect to an axis passing through the center of the inner lid and equidistant from the steam inlet in the circumferential direction, and the induction heating is performed by sandwiching a sheet having thermal conductivity between the bottom plate of the lid Rice cooker with a coil.