JP2008167833A - Pressure rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure rice cooker providing an efficient agitating effect when agitating cooked objects in a pot, by pressurizing and decompressing a pot inside. <P>SOLUTION: This pressure rice cooker includes: the pot for putting the cooked objects therein; a rice cooker body having an opening part and a heating means; a lid body for closing the opening part; a pressure valve having an opening/closing mechanism for communicating the pot inside with outside air or cutting off the communication; a pressure valve opening mechanism attached to the pressure valve; and a control means for controlling the heating amount of the heating means and the pressure valve opening mechanism, wherein the control means controls the cooking by alternately executing the pressurization and the decompression in a boiling retaining process in a series of cooking processes. This pressure rice cooker has a thin-sheet inner plate detachably mounted on an inner bottom part of the pot and the inner plate is formed with a plurality of recesses or holes having a width or a diameter smaller than the grain size of the cooking object. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pressure-type rice cooker that cooks rice with the inside of the pan in a pressurized state, and particularly to a pressure-type rice cooker that can convection a large amount of boiling water from a low position in the pan and cook rice. And a rice cooker that is easy to clean the pot.

In recent years, if the problem of global warming and environmental pollution can be solved as a top priority issue on a global scale, energy consumption can be reduced. To that end, it has entered an era in which it is important to be able to uniformly heat the entire pan by convection inside the pan of the rice to be cooked. Since global warming is one of the causes of frequent natural disasters, numerical targets for global warming prevention, that is, CO ₂ emissions, are set in each country and region around the world, and the target is achieved. Various measures have been put forward for this purpose, and efforts are being made in Japan to achieve reduction targets under the Kyoto Protocol. Under such circumstances, electric appliances used in ordinary households are also targeted, and electric rice cookers are urgently required to save energy, and rice cookers that have been devised in various ways have been introduced in patent literature.

  By the way, it is desirable for rice to be able to bring out the deliciousness of rice by cooking rice, cook it up to the core of the rice, and cook it evenly throughout the pan. In addition, rice can be cooked in a short time with the same energy per unit time. However, in the conventional rice cooker, the state of convection of the rice to be cooked inside the rice cooker is determined by the shape of the pan and the shape of the induction heating coil, and it is difficult to cook even rice.

  One of the reasons was how to secure the water required for boiling. If there is not enough water, the convection will not be sufficient, so the food to be cooked will not be sufficiently stirred, so the part near the induction heating coil will be much hotter than the center part of the pot, The temperature difference between and the temperature difference between the center and the outer periphery of the pan is large. Due to such uneven temperature inside the pan, the bottom of the pan near the heating part of the cooked rice is easy to scorch, the top finishes slightly harder, and only the center part finishes well. It was inevitable.

  Therefore, the present inventor has invented a pressure rice cooker that increases the pressure in the pan and allows water to penetrate into the rice grains in a short time by the synergistic effect of heating and pressure, and obtains an even cooked rice, and has already filed a patent application (For example, see Patent Document 1 below).

  Specifically, as shown in Patent Document 1 below, in a series of rice cooking processes in a pressure rice cooker, a water absorption process in which the rice absorbs water, and a rising process in which the cooked rice is heated quickly so that the cooked rice is in a boiling state. In the boiling maintenance process in which the inside of the pan is boiled and the pressure valve is opened and closed to maintain the pressure in the pan to be substantially constant in the pressurized state, the operation of forcibly opening the pressure valve is 1 to 6 In some cases, the rice to be cooked is vigorously stirred by using the violent boiling phenomenon (sudden boiling) that occurs when the pressure in the pan drops rapidly to near atmospheric pressure. By boiling the cooked rice near the central part of the pot and the inner wall of the pot by bumping, it is intended to obtain a boiled dish.

  However, in the boiling maintenance process in the above-mentioned pressure rice cooker, the present applicants are sucked by rice with time and the amount of water is reduced, and since the water becomes steam due to boiling, the effect of stirring is reduced. I knew it would go. In particular, because the initial bumping due to decompression occurs near the bottom of the pan, a sufficient stirring effect is obtained, but as the number of decompression overlaps, residual water at the bottom disappears and bumping occurs at the top of the pan, thus stirring. The effect of becomes weaker. For this reason, it has been found that it is desirable to keep the amount of water at the bottom as much as possible and to cause bumping from a low position in the pan, so that the stirring effect can be obtained more efficiently.

  On the other hand, for the purpose of obtaining a cooked state without uneven cooking, as shown in Patent Document 2 below, legs that are placed at the bottom of a rice cooker pan to make convection of a large amount of boiling water And a rice platform having an outer diameter supported by the legs and in contact with the inner peripheral surface of the pan, and placing a saw on the bottom of the rice cooker in which a porous portion of mesh that does not pass rice is formed on the rice platform. There is something that puts sharpened rice on top of the sushi and cooks it with water. In this case, the lower part of the soot is a boiling chamber and the upper part is a cooking chamber, which is a two-layer pan.

Furthermore, as shown in FIG. 14, the rice cooker disclosed in the following Patent Document 3 includes only the solid 131 of the cooked food at the bottom of the pot 122 into which the cooked food stored in the rice cooker main body 121 is placed. A pan 128 that separates the pan from the bottom of the pan 122, covers the top opening of the pan 122 with a lid 124, heats the pan 122 with the heating means 123, and detects the temperature of the pan 122 and the pan An output from the lid temperature detecting means 126 for detecting boiling in the 122 is input to the heating control means 127 to control the heating means 123. Further, the heating control means 127 includes a water absorption process, a cooking process, a boiling maintenance process, A heating means is controlled so that it may heat continuously in a cooking process and a boiling maintenance process among the rice cooking processes which consist of a steaming process. In addition, the code | symbol 132 of FIG. 14 is water.
JP 2004-344568 (paragraphs [0011], [0014], [0016], FIG. 1) JP-A-4-166111 (1st page, 2nd page, FIG. 1) JP-A-2005-261704 (paragraphs [0012] to [0014], [0028], FIG. 1 and FIG. 3)

  However, the rice cooker disclosed in Patent Document 2 has a boiling chamber at the bottom and a cooking chamber at the top, so that the amount of boiling water can be increased. When cooking rice, it will be overcooked and the rice will become watery. In addition, the heating in the boiling maintenance step is indirect and only steamed, and the desired effect cannot be obtained because the pot is not stirred and cooked during cooking.

  Moreover, the rice cooker of the said patent document 3 uses the saw 128, inputs the output from the pan temperature detection means 125 and the lid temperature detection means 126 to the heating control means 127, controls the heating means 123, and the heating control means 127. Controls the heating means 123 so as to heat continuously in each process such as the water absorption process, the cooking process, the boiling maintenance process, the cooking process of the rice cooking process consisting of the steaming process, but the cooking process is boiling Since it is not in a boiling state yet, the stirring force is not strong as in the boiling maintenance step. Further, the stirring force in the boiling maintaining step is weakened because the bubbles generated in the boiling chamber are blocked by the bubbles and the bumping is suppressed. For this reason, the effect | action which stirs the rice etc. which are cooked by the intense convection effect | action like a bumping state cannot be expected very much.

  Therefore, there is a need for a rice cooker that does not have the above disadvantages and that can quickly cook rice to be cooked while stirring from the bottom with an explosive amount of boiling water from the bottom of the pan, and cooks plump and delicious rice. . Furthermore, it is desirable that the pan is easy to care for.

  As a result of various studies to solve the above problems, the inventor of the present application provided an insole that is in contact with or substantially in contact with the inner bottom of the pan, and a plurality of depressions or By providing a hole, if the pot is depressurized when the water stored in the insole or the hole is boiled, the rice becomes evenly cooked with explosive heat convection from a low position in the pot. Has been found to be able to cook quickly, and has led to the completion of the pressure rice cooker of the present invention.

  That is, this invention aims at providing the pressure type rice cooker which can obtain a more efficient stirring effect, when stirring the to-be-cooked rice in a pan by pressurizing and decompressing the inside of a pan. To do.

  Another object of the present invention is to provide a pressure-type rice cooker that can easily remove rice that is attached to the bottom of the pan, can be easily washed and rinsed, and is easy to maintain.

  Furthermore, an object of this invention is to provide the pressure type rice cooker which can perform a fragrant fragrance to rice by scorching the rice cracker which generate | occur | produced in a series of rice cooking processes in a follow-up cooking process.

  In order to achieve the above object, a pressure rice cooker according to claim 1 of the present invention is a pan for containing a rice to be cooked containing water and rice, an opening for housing the pan, and a rice to be cooked in the pan. A rice cooker main body having a heating means for heating the pan, a lid for closing the opening of the pan and the rice cooker main body, a pressure valve having an open / close mechanism for communicating or blocking outside air with the inside of the pan, and the pressure valve A pressure valve opening mechanism for forcibly opening the pressure valve, and control means for controlling the heating amount of the heating means and controlling the opening operation of the pressure valve by the pressure valve opening mechanism And the control means is a pressure type rice cooker that performs control by alternately performing pressurization and decompression in a boiling maintaining step in a series of rice cooking steps, and is in close contact with the inner bottom portion of the pan And has a thin insole that can be detachably mounted , The insole and a plurality of recesses or holes having a smaller width or diameter than the particle size of the object to be cooking object is formed.

  According to a second aspect of the present invention, in the pressure rice cooker according to the first aspect, the insole is attached to the inner bottom portion of the pan closely or substantially closely.

  The invention according to claim 3 is the pressure rice cooker according to claim 1, wherein the insole is formed of iron, stainless steel, copper, aluminum, nickel, or an alloy of these metals. .

  A fourth aspect of the present invention is the pressure rice cooker according to the first aspect, wherein the insole is formed of a sintered body of carbon 95% to 100%.

  The invention according to claim 5 is the pressure rice cooker according to claim 1, wherein the recess or hole formed in the insole is a groove or a slit.

  A sixth aspect of the present invention is the pressure rice cooker according to the first aspect, wherein the recess or hole formed in the insole is a depression or hole having a circular, elliptical or polygonal shape. Features.

  The invention according to claim 7 is the pressure rice cooker according to any one of claims 1 to 6, wherein the recesses or holes formed in the insole are concentric, radial or parallel lines extending outward from the center. It is characterized by being arranged in a shape.

  Invention of Claim 8 is the pressure type rice cooker in any one of Claims 1-7, The shape of the cross section of the recessed part formed in the said insole is either a rectangle, U shape, or V shape It is characterized by.

  The invention according to claim 9 is the pressure rice cooker according to any one of claims 1 to 8, wherein the insole is provided with a magnet for detachably mounting in contact with an inner bottom portion of the pan. It is characterized by.

  The invention of claim 10 is the pressure rice cooker according to claim 1, wherein the control means burns rice balls accumulated between the insole and the pan bottom in the follow-up cooking process after rice cooking, It is controlled to perform scenting.

  By providing the above configuration, the present invention has the following excellent effects. That is, according to invention of Claim 1, the pressure type rice cooker of this invention has employ | adopted the pressure type rice cooking system which repeats pressurization and pressure reduction in a boiling maintenance process among a series of rice cooking processes, During the boiling under reduced pressure in this method, more rapid convection occurs and stirs the rice, so it is possible to cook plump and delicious rice quickly. That is, a thin insole that is detachably attached to the inner bottom portion of the pan in which the rice to be cooked of the pressure rice cooker of this method is provided, and the insole has a width smaller than the particle size of the cooked rice or By forming a plurality of recesses or holes having a diameter, water is accumulated in that portion, and when this water is suddenly depressurized from a pressurized state by being heated at the time of rice cooking, it boils at once (sudden boiling) Become. In this case, since water is stored in the inner bottom of the pan, bumping occurs in the inner bottom portion, so sudden convection occurs from a lower position than before, and this convection stirs the rice to be cooked, that is, rice. So you can cook delicious plump rice quickly. Moreover, the energy required for cooking rice can be saved.

  Furthermore, in this pressure rice cooker, the insole is configured to be detachably attached to the inner bottom part of the pan, so take out the insole after using the pressure rice cooker, The rice grains can be washed and removed as they are, and the insole and pan bottom can be easily rinsed and rinsed.

  In the invention of claim 2, the above-mentioned effect can be obtained by attaching the insole to the inner bottom portion of the pan in close contact or substantially in close contact.

  The invention of claim 3 is the pressure rice cooker according to claim 1, wherein the insole is formed of iron, stainless steel, copper, aluminum, nickel, or an alloy thereof having good thermal conductivity and durability. Therefore, there is little heat loss, it does not break even if dropped, and it can be removed from the pan, so it is easy to handle such as washing and rinsing.

  Further, the invention of claim 4 is the pressure rice cooker according to claim 1, wherein the insole is formed of a sintered body of carbon 95% to 100%, so that heat conduction is good and heating is performed. Suitable for. Moreover, since it is a sintered compact, the convection by the raise of the bubble at the time of boiling is obtained by the bubble from the micropore in a base material, and uniform rice cooking can be performed. In addition, the charcoal action removes impurities from the water and cooks delicious rice. Furthermore, since the carbon sintered body has a high heat capacity, heat insulation can be performed with low power consumption.

  According to the inventions of claims 5 and 6, a plurality of recesses or holes having a width or diameter smaller than the grain of rice are formed in the insole of the pot by providing grooves, slits, depressions or holes. The recess or hole has a shape such as a circle, an ellipse, or a polygon, but water is stored in the plurality of recesses or holes and heated, and when it is rapidly depressurized from a pressurized state, it boils all at once. Vigorous convection can be triggered from near the bottom of the pan. And this heat of boiling penetrates into rice and can bring out the deliciousness. In addition, rice agitated with a large amount of boiling water promotes water absorption and can be converted into α from the core of each grain. And this heats up to the center of the pot where the temperature is difficult to rise, and the rice in the center of the pot is cooked deliciously.

  According to invention of Claim 7, the recessed part or hole of the pan of a rice cooker can take various arrangement | sequences as an embodiment. The effect of the invention of claim 1 can be further ensured by selecting a suitable arrangement from among these arrangements. For example, if the central part of the insole is arranged in a concentrated manner, what has been cooked in the state where the central part is recessed can be changed to a cooked state where the central part is raised.

  According to invention of Claim 8, the cross section of a groove | channel or a hollow can be suitably selected from a rectangle, U shape, V shape, etc.

  According to the ninth aspect of the present invention, the insole is provided with a magnet for being detachably mounted in contact with the inner bottom portion of the pan, so that it is fixed in close contact with the inner bottom of the pan when mounted on the pan. Therefore, the insole is not displaced when washing rice, etc., and it is easy to remove and there is no need to provide a special fixing device on the bottom of the pan.

  According to the invention of claim 10, the control means controls the scorch so that the rice is burnt in the additional cooking process, so that the rice has a fragrant fragrance, so that a delicious scent is added and the appetite is much better. You can get more rice.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a rice cooker for embodying the technical idea of the present invention, and is not intended to identify the present invention as this rice cooker. The present invention can be equally applied to the other embodiments included in the scope.

    FIG. 1 is a cross-sectional view of a pressure rice cooker according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a pan of the pressure rice cooker, showing a state where an insole having a recess is provided at the bottom of the pan. It is. FIG. 3: is sectional drawing which concerns on the other Example of the pan of a pressure type rice cooker, and has shown the figure which provided the insole which has a hole in the pan bottom part. FIG. 4 is a cross-sectional view of another embodiment of the rice cooker, showing an example in which the insole is mounted with a gap from the inner bottom portion of the pan. FIG. 5 is a plan view of an insole in which the formed recesses or holes are concentrically arranged radially with grooves or slits, and FIG. 6 is a diagram in which the formed recesses or holes are arranged radially from the center. FIG. 7 is a plan view of an insole formed in a central portion with a concavity or hole formed in a circular shape, and FIG. 8 is a circular view of the concavity or hole formed in FIG. FIG. 9 is a plan view of an insole formed in an array, FIG. 9 is a plan view of an insole in which the formed recess or hole is circular, the center hole is large and the peripheral hole is small, and FIG. 10 is formed. FIG. 5 is a plan view of an insole in which the recessed portion or hole is circular and the peripheral hole is large and the central hole is small. FIG. 11 is an example plan view of an insole formed concentrically with a plurality of recesses as grooves. FIG. 12 is a cross-sectional view of a recess formed in the insole. FIG. 12 (a) shows a rectangle, FIG. 12 (b) shows a U-shaped recess, and FIG. 12 (c) shows a V-shaped recess. FIG. 13 is a curve diagram showing a control state of temperature and pressure in the rice cooking process.

  As shown in FIG. 1, for example, a pressure rice cooker 1 according to an embodiment of the present invention includes a pan 3 into which a rice to be cooked is placed, an opening for detachably storing the pan 3, and a rice to be cooked in the pan 3. A rice cooker body 2 having an induction heating coil 5 and the like, a vent hole 23a and an exhaust hole 23b communicating outside, a lid 4 for closing the opening of the pan 3 and the rice cooker body 2, and an induction heating coil 5 And a control means for controlling the side heater 6 and the like to cook the rice to be cooked and keeping warm, the rice cooker body 2 is provided with a shutter mechanism 25 for opening and closing the vent hole 23a and the exhaust hole 23b, and the control means is rice cooking. The shutter mechanism 25 is controlled so that the vent hole 23a and the exhaust hole 23b are opened when the temperature inside the container body is equal to or higher than the predetermined temperature, and the vent hole 23a and the exhaust hole 23b are closed when the temperature is lower than the predetermined temperature. ing.

  The rice cooker main body 2 has a bottomed cylindrical inner case 21 formed of a nonmetallic material that accommodates the pot 3 therein, and an outer case 22 that covers the inner case. 3 is detachably accommodated. The inner case 21 has a flange 21a that protrudes to the outer periphery at its upper end. The pan 3 is formed with a flange 31 projecting outward at an upper end opening thereof, and the pan 31 is placed so as to be hooked on the flange 21 a of the inner case 21. The inner case 21 is provided with the induction heating coil 5 on the outer periphery near the bottom. The induction heating coil 5 is supported by a coil cover (not shown) formed of a heat resistant resin material so that the distance to the outer peripheral surface of the pan 3 is constant. Further, a side heater 6 is disposed in the inner case 21 between the upper opening and the induction heating coil 5.

  The lid body 4 has a structure in which a front lid 41 and a lid cover 48 are respectively attached to the upper and lower sides of the frame body 42, and an inner lid 43 is attached to the frame body via the lid cover 48, and the inner case of the rice cooker main body 2. It is attached so as to cover the upper opening of 21. The attachment has the structure which supported the frame 42 on the rice cooker main body 2 using the hinge member 44 and the pivot pin 45. As shown in FIG. Between the frame body 42 and the inner lid 43, a lid heater 49 is disposed so as to be covered with a lid cover 48, and a lid temperature sensor (not shown) is provided.

  Furthermore, the inner lid 43 is equipped with a pressure adjustment valve 4a and a safety valve 4b for adjusting the pressure in the rice cooker body 2. The pressure regulating valve 4a has an opening / closing mechanism for communicating or blocking the inside of the pan and the outside air so that the pressure in the pan is substantially constant. Then, a pressure adjustment valve opening mechanism such as a solenoid (not shown) attached to the pressure adjustment valve 4a for forcibly opening the pressure adjustment valve 4a, a heating amount of the heating means, and a pressure adjustment valve opening mechanism Control means for controlling the opening operation of the pressure regulating valve 4a by the control means, and the control means is controlled to perform rice cooking by pressurizing and depressurizing in a boiling maintaining process in a series of rice cooking processes.

  The lid cover 48 is fixed to the frame body 42, and the inner lid 43 covers the lid cover 48 and is detachably supported by the frame body 42. The top lid 41 is detachably mounted with a spillover prevention lid 4c that prevents the cooked rice in the pan 3 from spilling out and jumping out at once. Around the outer periphery of the inner lid 43, a pot packing 46 that seals the flange portion 31 of the pot and the inner lid 43 is supported and attached to the outer frame 50. Further, a locking member 47a formed at the upper end of the inner case 21 is provided on the opposite side of the hinge member 44, and is locked by a locking lever 47b provided on the frame body 42 to close the lid body 4. Supports the state. When the pot 3 is accommodated in the rice cooker body 2 and covered with the lid 4, the pot packing 46 is pressed against the opening edge of the pot 3 and the pot 3 is closed.

  The rice cooker body 2 is equipped with an operation plate 7 on the front surface of the outer case 22. The operation plate 7 is provided with operation buttons such as a power switch 7a, a rice cooking start switch, a menu selection switch, a heat retention switch and the like (not shown) and a display panel 7b. On the panel 7b, a rice cooking menu selected by an electronic component (not shown) attached to the operation control board 8 is displayed.

  The rice cooker body 2 is provided with a pan bottom temperature sensor 32 at the center of the bottom 23 so as to be in contact with the bottom surface of the pan 3. Further, either the rice cooker body 2 or the lid 4 is provided with an outside air temperature sensor (not shown) that detects the outside air temperature. The rice cooker main body 2 receives information from the temperature sensor, and supplies and controls power to heating means such as the induction heating coil 5, the side heater 6, and the lid heater 49 in accordance with a predetermined program incorporated therein. Is disposed in the vicinity of the vent hole 23a. The power supply control board 10 is equipped with control means made of electronic components such as inverters made of semiconductor elements, switching elements, timer elements and the like. The control means controls the heating amount of the heating means, controls the opening operation of the pressure valve by the pressure valve opening mechanism, and controls to cook rice by pressurizing and depressurizing in the boiling maintaining process in a series of rice cooking processes. Is done. Among these electronic components, the inverter 9 generates heat during operation and is cooled by the heat sink or the cooling fan 11.

  As shown in FIG. 1, a vent 23a for sucking air and an exhaust hole 23b for discharging the sucked air are formed in the bottom 23 of the rice cooker body 2, and the cooling fan 11 is located in the vicinity of the vent 23a. Is arranged. The vent hole 23a and the exhaust hole 23b are formed in the bottom 23 by a plurality of narrow grooves having a predetermined width and length, so-called slits. The vent holes 23a and the exhaust holes 23b made of these slits are opened and closed by opening / closing doors made of a plate-like body having a width and a length that block the respective slits, that is, shutter plates 23a 'and 23b'. The shutter plates 23a 'and 23b' are connected to the operation plate 24, and the operation plate 24 is moved by the solenoid 12 to open and close the vent hole 23a and the exhaust hole 23b. The operation plate 24 is guided by a guide mechanism 26 provided on the bottom 23 of the rice cooker body 2 and is slidable on the bottom 23. The shutter mechanism 25 includes an operation plate 24 having shutter plates 23a 'and 23b' and a solenoid 12 that operates the operation plates.

  The present invention is, for example, as described above, the pan 3 into which the rice to be cooked is placed, the opening for storing the pan 3, the heating means for heating the cooked rice in the pan 3, and the heating means to control the cooking of the rice to be cooked. A rice cooker body 2 having a control means for performing rice cooking and heat retention control, and a lid 4 that closes the opening of the pan 3 and the rice cooker body 2, and repeatedly pressurizing and depressurizing in the boiling maintaining process during the rice cooking process. In the pressure type rice cooker controlled to perform rice cooking, as shown in FIGS. 2 to 4, the rice cooker has a thin plate-like insole 51 that is detachably attached to the inner bottom portion 3 a of the pan 3. Are formed with a plurality of recesses 52a or holes 52b having a width or diameter smaller than the particle size of the cooked rice. 2 and 3 show an example in which the insole 51 in which the recess 52a or the hole 52b is formed is closely attached to the inner bottom. In FIG. 4, the insole 51 in which the hole 52b is formed is a pot. 3 shows an example in which it is slightly lifted from the inner bottom portion of No. 3, and is mounted with an interval 52C of 3 to 5 mm specifically.

  The insole 51 is formed of the same material as that of the pan 3, for example, iron, stainless steel, copper, aluminum, nickel or the like, or one or more kinds of clad materials containing them. Like the above, it has a high thermal conductivity and does not bend, and does not rust or withstand rubbing caused by rubbing. Furthermore, the thing manufactured with the electromagnetic material is preferable since the heating by induction heating is accelerated | stimulated. The insole 51 can also be formed of a sintered body of carbon 95% to 100%, but has good heat conduction, and a material suitable for electromagnetic induction heating can be obtained by increasing the resistivity. In this case, since it is a sintered body, air bubbles from the fine pores in the base material allow convection due to the rising of the air bubbles during boiling, and uniform rice cooking can be achieved. You can cook delicious rice. Since the heat capacity of the carbon sintered body is high, heat insulation can be performed with low power consumption. The material of the insole 51 may be made of a ceramic such as alumina having good thermal conductivity, and by mixing the particulate carbon with the ceramic, a material that can cook delicious rice can be obtained. Further, the insole 51 may be coated with a Teflon (registered trademark) film in order to reduce adhesion of the cooked rice. Since the insole 51 can be removed, it is easy to handle when washing after cooking.

  The plurality of recesses 52 a or holes 52 b formed in the insole 51 may be elliptical grooves as shown in FIG. 5, or these may be slits penetrating the insole 51. Further, as shown in FIG. 6, a circular recess (recess) 52 a or a hole 52 b penetrating the insole 51 may be used. Alternatively, the recess 52a may have various shapes such as an ellipse, a rectangle, a hexagon, and other polygons. Furthermore, it may be a hole 52b having a circular, elliptical or polygonal shape. In short, a plurality of concave portions (holes) or holes having a width or diameter smaller than the grain size of rice so long as normal rice grains do not enter may be used.

  The plurality of recesses 52a or holes 52b formed in the insole 51 of these pans 3 are arranged radially, concentrically, and the like at predetermined intervals on the bottom surface portion of the insole 51 as shown in FIGS. Provided. What is necessary is just to select suitably the space | interval, the number, etc. of the recessed part 52a or the hole 52b. Alternatively, although not shown, a part of a circle may be arranged in a concentric circle partially cut, and in this case, there is no groove or depression between a plurality of groove portions arranged in a sector shape as a whole. There will be multiple sectors.

  For example, the recess 52a or the hole 52b formed in the insole 51 is provided with elliptical grooves and slits arranged concentrically and radially from the center as shown in FIG. 5, or as shown in FIG. In the bottom portion of 51, recesses 52a or holes 52b of equal size are provided concentrically and radially from the center. Alternatively, as shown in FIG. 7, the plurality of circular recesses 52a or holes 52b may be divided into a central part and a peripheral part of the insole 51 and arranged so as to be concentrated in the central part. The circular recess 52a or the hole 52b is not provided in the center portion of the insole 51 but is concentrated outside. Furthermore, as shown in FIGS. 9 and 10, recesses or holes having different sizes may be arranged. In FIG. 9, the recess 52a or the hole 52b near the center is enlarged, and in FIG. 10, it is enlarged near the outer periphery. Of course, the recess 52a and the hole 52b are not limited to a circle, but may be indentations or through-holes of various shapes such as a polygon such as a rectangle or a hexagon, although not shown. Alternatively, the arrangement may be such that a plurality of grooves and slits are arranged in parallel in the insole 51, and the form, size, arrangement, density of the arrangement, and the like can be selected as appropriate. For example, FIG. 11 shows an example of this, and the insole 51 is formed by concentrically arranging a plurality of recesses 52a as grooves.

  As shown in FIG. 12, the recess 52a formed in the insole 51 has a rectangular shape as shown in FIG. 12 (a), a U-shape or semi-circular shape as shown in FIG. 12 (b), or FIG. It can be formed in a V shape as shown in (c). And since the width | variety of these recessed parts 52a is narrower than the particle size of rice as shown in the figure, water is stored without entering rice.

  As shown in each figure, the insole 51 is provided with a magnet 53 that is detachably attached to the inner bottom portion of the pan 3 and is fixed to the back surface thereof. Thus, by providing the magnet 53 for detachably mounting the insole 51 in contact with the inner bottom portion of the pan 3, when the insole 51 is mounted on the pan 3, it is fixed to the inner bottom of the pan. It is held without moving when sharpening rice, and it is easy to remove after cooking rice, and there is no need to provide a special fixing device on the bottom of the pan. The magnet 53 is selected from heat-resistant magnets, and may be a metal magnet or a rubber magnet. The attachment portion of the magnet can be formed as a spacer that creates an interval between the insole and the pan bottom.

  In this way, by forming a plurality of recesses 52a or holes 52b having a width or diameter smaller than the grain size of rice in the insole 51 attached to the inner bottom portion of the pan 3 into which the cooked rice of the rice cooker is placed, According to the present invention, when the water accumulated in the recesses 52a and the holes 52b is heated at the time of rice cooking, it boils all at once, and can cause heat convection from a lower position than a conventional pan and a large amount of boiling. Rice agitated with water is promoted to absorb water and can be gelatinized from the core of each grain. And by this, it heats to the center part of the pan where the temperature is difficult to rise, and the rice in the middle of the pan is cooked deliciously. And since it is boiling water from the position lower than before, this boiling heat penetrate | infiltrated into rice, and it can cook and provide plump delicious rice quickly. Moreover, the energy required for cooking rice can be saved.

  The present invention having such an action performs pressurization and decompression in the process of cooking rice as shown in FIG. 13, applies high temperature during pressurization to infiltrate heat and moisture into the rice core, and rapidly It becomes extremely effective when applied to a rice cooker that stirs rice by explosive convection caused by decompression. In this rice cooking method, rice is cooked at, for example, 1.2 atm and 105 ° C. at the time of pressurization, and the pressure is rapidly reduced to 1 atm at the time of depressurization. Then, in the case of rice, heat and moisture penetrate to the core of the rice during pressurization to extract sweetness and stickiness, and during decompression, large boiling occurs and the rice is stirred from the bottom of the pan, so the water absorption of rice Is promoted and the rice is turned into α from the core, and the rice is heated to the center of the pan by stirring and cooked plump rice. This control is to control the pressurizing / depressurizing means such as valves intermittently while maintaining the temperature in the boiling maintenance process among the rice cooking process consisting of the water absorption process, the rising process, the boiling maintenance process, the steaming process, and the additional cooking process. It is. At the time of depressurization at the time of boiling, a large amount of water is required at the bottom of the pot in order to cause sudden boiling and perform rapid and large stirring. However, according to the present invention, a necessary amount of water can be ensured.

  That is, an insole 51 that is detachably attached to the inner bottom portion of the pan 3 into which the rice to be cooked of this type of rice cooker is placed, and the insole 51 has a width or diameter smaller than the particle size of the cooked rice. By forming a plurality of recesses 52a or holes 52b, the water stored in that portion is heated at the time of rice cooking and suddenly depressurized from the pressurized state, and then boils all at once, and more from a lower position in the pan than before. As the water is supplied, rapid convection occurs and the rice is stirred, so you can quickly cook delicious plump rice. Moreover, the energy required for cooking rice can be saved. Depending on the amount of rice to be cooked, if necessary to cause rapid convection from a low position in the pan, the insole 51 is mounted at a slight interval from the pan bottom so as to supply the necessary amount of water. In this way, the water stored in that part is used. This interval is usually 3 to 5 mm.

  This rice cooker generates a large amount of rice which is umami-no-mochi in the boiling process. When the steaming process is over, the rice ball remains between the insole 51 and the inner bottom of the pan 3. By heating the pot in the follow-up cooking process by the control means and scorching the rice cake left between the insole 51 and the inner bottom of the pot, the rice is fragrantly scented without scorching the rice itself. The flavor can be further increased.

  As described above, according to the present invention, in the pressure-type rice cooker that is controlled to pressurize and depressurize in the boiling maintenance process during the rice cooking process, the inner bottom of the pot accommodated in the rice cooker body With a structure that has an insole that is detachably attached to the part, and a plurality of recesses or holes having a width or diameter smaller than the grain size of rice are formed in the insole, a large amount of boiling water from the pan bottom The rice cooker can cook rice while stirring from the bottom, and can cook delicious plump rice. This rice cooker can effectively use energy and is also effective for energy saving. Moreover, since the insole is detachably attached to the pan, it is easy to clean the pan.

FIG. 1 is a sectional view of a pressure rice cooker according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an embodiment of a pan of a rice cooker, and shows a diagram in which an insole having a recess is provided in the pan bottom portion. FIG. 3 is a cross-sectional view of another embodiment of the pot of the rice cooker, and shows a diagram in which an insole having a hole is provided in the pot bottom portion. FIG. 4 is a cross-sectional view of another embodiment of the rice cooker, showing an example in which the insole is mounted with a gap from the inner bottom portion of the pan. FIG. 5 is an embodiment plan view of an insole in which the formed recesses or holes are arranged concentrically and radially by grooves or slits. FIG. 6 is an example plan view of an insole in which the formed recesses or holes are arranged radially from the center. FIG. 7 is a plan view of an embodiment of the insole formed by concentrating and arranging the formed recesses or holes in a circular shape in the center. FIG. 8 is a plan view of an embodiment of an insole formed by concentrating and arranging the formed recesses or holes in a circular shape on the outer periphery. FIG. 9 is a plan view of an embodiment of an insole in which the formed recess or hole is circular and the hole in the center is large and the hole in the periphery is small. FIG. 10 is an example plan view of an insole in which the formed recesses or holes are circular, the peripheral hole is large and the central hole is small. FIG. 11 is an embodiment plan view of an insole provided by concentrically arranging a plurality of recesses as grooves. 12A and 12B are cross-sectional views of a recess formed in the insole. FIG. 12A shows a rectangular shape, FIG. 12B shows a U-shaped recess, and FIG. 12C shows a V-shaped recess. FIG. 13 is a curve diagram showing a control state of temperature and pressure in the rice cooking process. FIG. 14 is a system configuration diagram of a conventional rice cooker.

Explanation of symbols

2 Rice cooker body 3 Pot 4 Lid 4a Pressure adjustment valve 4b Safety valve 4c Blow-out prevention lid 5 Induction heating coil 6 Side heater 7 Operation plate 7a Power switch 7b Display panel 8 Operation control board 9 Inverter 10 Power supply control board 11 Cooling fan 21 Inside Case 22 Outer case 31 Pan flange portion 32 Pan bottom temperature sensor 41 Front lid 42 Frame 43 Inner lid 51 Insole 52a Recess, indentation 52b Hole 52c Interval 53 Magnet

Claims (10)

  A pot for containing the rice to be cooked including water and rice, an opening for accommodating the pot, and a rice cooker body having heating means for heating the rice to be cooked in the pot, and an opening for the pot and the rice cooker body. A lid that closes the part, a pressure valve having an opening / closing mechanism for communicating or blocking the inside of the pan and the outside air, and a pressure valve opening mechanism attached to the pressure valve for forcibly opening the pressure valve And a control means for controlling the heating amount of the heating means and controlling the opening operation of the pressure valve by the pressure valve opening mechanism, and the control means is pressurized in the boiling maintaining process during a series of rice cooking processes. A pressure rice cooker that controls to perform rice cooking by alternately performing pressure reduction and decompression, and has a thin plate-like insole that is detachably attached to the inner bottom portion of the pan, and the insole A plurality having a width or diameter smaller than the particle size of the cooked rice Pressure type rice cooker, characterized in that part or holes are formed.   The pressure rice cooker according to claim 1, wherein the insole is attached to the inner bottom portion of the pan in a close or almost intimate manner.   2. The pressure rice cooker according to claim 1, wherein the insole is formed of iron, stainless steel, copper, aluminum, nickel, or an alloy of these metals.   The pressure type rice cooker according to claim 1, wherein the insole is formed of a sintered body of carbon 95% to 100%.   The recess or hole formed in the insole is a groove or a slit, and the pressure rice cooker according to claim 1.   2. The pressure rice cooker according to claim 1, wherein the recess or the hole formed in the insole is a hollow or a hole having a circular shape, an elliptical shape, or a polygonal shape.   The recesses or holes formed in the insole are provided concentrically, arranged radially or parallel to the outside from the center, and arranged in parallel lines. Pressure rice cooker.   The pressure rice cooker according to any one of claims 1 to 7, wherein a shape of a cross section of the recess formed in the insole is any one of a rectangle, a U shape, and a V shape.   The pressure rice cooker according to any one of claims 1 to 8, wherein the insole is provided with a magnet that is detachably mounted in contact with an inner bottom portion of the pan.   The said control means is controlled to scent the to-be-cooked rice by scorching the rice cake accumulated between the insole and the pan bottom in the additional cooking process after cooking rice. Pressure rice cooker.

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