JP4416714B2 - Pressure cooker - Google Patents

Description

  The present invention relates to a pressure heating cooker that cooks by raising the pressure chamber to a pressure equal to or higher than the atmospheric pressure by suppressing the ejection of steam, and in particular, accommodates a pot-shaped container in which food is placed inside the pressure chamber. In this way, the present invention relates to a pressure cooker in which the pressure inside the pot-like container and the pressure outside are made the same.

  Conventionally, this type of pressure heating cooker has a pan-shaped container and a lid that seals the opening of the pan-shaped container, and a pressure regulating valve is generally provided on the lid. . This pressure regulating valve is equipped with a pressurization mechanism that closes the exhaust port provided on the inner lid side of the lid by its own weight. When cooking is started, the exhaust port is opened and the inside of the pan-like container rises to a predetermined temperature. Then, when a predetermined time has elapsed, the pressurizing mechanism is operated to close the exhaust port, and the inside of the pan-like container is raised to a pressure equal to or higher than the atmospheric pressure. And if the pressure in a pan-like container becomes higher than predetermined pressure, a pressurization mechanism will be pushed up with the pressure, a pressure will be open | released to air | atmosphere with steam, and if a pressure falls, a pressurization mechanism will fall. Thus, the inside of a pan-like container is hold | maintained at the set peak pressure by a pressure mechanism moving up and down. As described above, the conventional pressure cooker comprises a pressure vessel (pressure chamber) with a pan-like container and a lid, and the boiling temperature is increased by increasing the pressure in the pan-like vessel containing the ingredients. Thus, the food can be cooked quickly and softly with little electric power (see, for example, Patent Document 1).

JP 2002-17567 A

  However, in the conventional pressure heating cooker (rice cooker) as described in Patent Document 1 described above, the material of the pot-shaped container (inner pot) is charcoal, glass, ceramics, earthenware, pottery, or the like. When the material has the property of breaking against strong impact, the pot-shaped container (inner pot) may be damaged by the pressure acting on the wall surface of the pot-shaped container (inner pot) from the inside to the outside. It had the problem that. In addition, when the material of the pot-shaped container (inner pot) is porous, such as charcoal or earthenware, the moisture in the foodstuff passes through the porous micropores due to the pressure acting on the wall surface of the pot-shaped container (inner pot). And had a problem of oozing out.

  The present invention has been made in view of the above-described problems. Instead of making the pan-like container part of the pressure chamber as in the prior art, the entire pan-like container is accommodated inside the pressure chamber. Thus, an object of the present invention is to provide a pressure cooker that can suppress the breakage of the pot-shaped container and the exudation of the moisture of the ingredients by making the pressure inside and outside the pot-shaped container the same.

  In order to solve the above-described problems and achieve the object, the pressure heating cooker according to the present invention suppresses the jet of steam, thereby increasing the pressure in the pressure chamber to a pressure equal to or higher than the atmospheric pressure for cooking. A heating cooker, a pot-shaped container, a main body provided with a receiving recess for receiving the pot-shaped container, a heating means provided in the main body for heating the pot-shaped container, and an opening for receiving and opening attached to the main body A lid that forms a pressure chamber together with the housing recess, and pressure adjusting means that is provided in either the main body or the lid and maintains the pressure in the pressure chamber at a high pressure.

  According to this invention, instead of making the pan-like container a part of the pressure chamber as in the prior art, by accommodating the entire pan-like container inside the pressure chamber, the pressure inside and outside the pan-like container By making the same, it is possible to prevent the pan-like container from being damaged and moisture from oozing out.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pressure heating cooker according to the present invention will be described in detail based on the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a cross-sectional view of an electromagnetic induction heating rice cooker which is a pressure heating cooker according to an embodiment of the present invention. In FIG. 1, an electromagnetic induction heating rice cooker 100 includes a rice cooker body 1 provided with a storage recess 10 having an upper opening, and a hinge portion (not shown) provided at the upper rear portion of the rice cooker body 1. 1 is attached so as to be openable and closable, and the opening of the housing recess 10 is sealed to form the pressure chamber 30 together with the housing recess 10, and the pressure chamber 30 provided in the lid 2. Solenoid 16 which is a pressure adjusting means for keeping the internal pressure at a high pressure, an inner pot 3 which is a pan-like container that is detachably accommodated in the accommodating recess 10, and an inner pot 3 provided in the rice cooker body 1. The heating coil 4 is a heating means for electromagnetic induction heating.

  The rice cooker body 1 has a body case 5 that constitutes the exterior and interior of the rice cooker body 1. The main body case 5 is formed in a substantially cylindrical shape and forms an outer wall 6a and an upper frame 6b of the rice cooker main body 1 and an upper case 6 and is configured integrally with the upper case 6, and an outer peripheral end portion is an outer wall 6a of the upper case 6. The lower case 7 which is joined to the lower end of the rice cooker body 1 to form the bottom surface 7a of the rice cooker body 1, and the upper case 6 is joined to the upper frame 6b of the upper case 6 which is substantially cylindrical and has a substantially cylindrical shape. An inner case 8 that forms a part of the housing recess 10 of the inner pot 3, and a shape that is substantially bowl-shaped and covers the lower part of the inner pot 3, and the upper end is the inner case 8. A coil base 9 that is integrally coupled to the lower end of the inner pot 3 together with the inner case 8 to form the accommodating recess 10 of the inner pot 3, further forms the bottom surface 9a of the accommodating recess 10, and the heating coil 4 is disposed on the lower surface side. It is constituted by. The upper end portion of the inner case 8 is a flange portion 8a having a shape that is formed by bending a predetermined width outward over the entire circumference. And on this flange part 8a, the three support protrusion 8b which supports the inner pot 3 is formed 120 degree | times apart.

  A heating coil 4 for electromagnetic induction heating is disposed on the lower surface of the coil base 9. The heating coil 4 is composed of an inner coil 4a provided on the flat part on the back surface of the coil base 9 and an outer coil 4b provided on the curved part on the outer peripheral side. The inner coil 4a and the outer coil 4b are swirled in a spiral shape and connected in series, and are supplied with a high-frequency current.

  A sensor hole 9b for placing the pan bottom temperature sensor 13 is formed at substantially the center of the coil base 9 forming the bottom surface 9a of the housing recess 10. And the substantially cylindrical pan-bottom temperature sensor 13 is arrange | positioned in the sensor hole 9b so that it may protrude from the sensor hole 9b. The pan bottom temperature sensor 13 is urged by a compression spring 14 that is contracted between the bottom surface 7 a and the upper end surface of the pan bottom temperature sensor 13 abuts against the bottom rear surface of the inner pan 3. The pan bottom temperature sensor 13 measures the temperature of the inner pan 3 in such a state that the upper end surface is in contact with the bottom rear surface of the inner pan 3.

  The lid body 2 is provided with an attachment hole 18a in which a steam discharge device 20 having a steam port 20a is detachably attached at substantially the center, and an outer lid 18 that forms the upper surface side of the lid body 2; And an inner lid 19 having a pressure regulating structure portion 25 connected to the lower opening of the steam discharge device 20 and forming the lower surface side of the lid body 2. An operation panel 15 having a rice cooking switch, a reservation switch, and the like is provided on the front side of the outer lid 18.

  FIG. 2 is a perspective view showing a state in which the inner pot 3 is accommodated in the accommodating recess 10. In FIG. 2, the inner pot 3 is comprised from the inner pot main body 3a which comprises a substantially bowl shape, and the flange part 3b formed in the bowl shape over the perimeter to the outer side from the opening part of this inner pot main body 3a. . The material of the inner pot 3 is composed of a 95% to 100% carbon fired body having good heat conduction as a base material, and a fluorine coating or the like is applied to the inside. Moreover, since a sintered body is comparatively easy to break, it is composed of 4 to 10 mm, which is approximately 2 to 5 times the plate thickness of a conventional metal container. For this reason, even if it is the inner pot 3 which made the fired body a base material, sufficient intensity | strength is obtained. When the inner pot is composed of carbon, so-called charcoal, first, the charcoal is heated to generate infrared rays, so that delicious rice can be cooked. In addition, the charcoal deodorizing action absorbs the tap water and makes it possible to cook tasty and delicious rice.

  FIG. 3 is a cross-sectional view of the main part for explaining the structure of the pressure chamber 30. FIG. 3 is abbreviate | omitting and showing the member which is not related to the pressure chamber 30 so that the member which comprises the pressure chamber 30 can be understood well. FIG. 4 is an enlarged view of portion A in FIG. FIG. 5 is a view showing a state in which the housing recess 10 and the lid are connected in an airtight manner by the action of the packing 12. 3 and 4, the storage recess 10 that forms the lower part of the pressure chamber 30 is integrated with the inner case 8 that forms the inner wall of the rice cooker body 1 and the lower end of the inner case 8 in a generally bowl shape. And an upper frame 6b of the upper case 6 that is airtightly connected to a flange portion 8a formed at the upper end portion of the inner case 8. Inside the upper frame 6b, a resin packing 12 is provided so as to protrude inward over the entire circumference (see FIG. 2).

  In FIG. 3, the lid body 2 constituting the upper portion of the pressure chamber 30 includes an outer lid 18 that forms the upper surface side of the lid body 2 and an inner lid 19 that forms the lower surface side of the outer lid 18. The outer peripheral edge portion of the inner lid 19 is airtightly connected to the outer peripheral portion of the outer lid 18. The pressure regulating structure 25 formed on the inner lid 19 is provided with a solenoid 16 and a safety valve 17 as pressure regulating means. A sensor hole 9b is formed in the central portion of the coil base 9 that forms the bottom surface 9a of the housing recess 10. As a sealing means for sealing the sensor hole 9b, a resin cover member 39 that covers the entire sensor hole 9b together with the pan bottom temperature sensor 13 is provided. The resin cover member 39 is strong enough to withstand the pressure in the pressure chamber 30. As a result, the pressure chamber 30 can be formed relatively easily without a particularly complicated structure and without increasing the number of components except for the resin cover member 39. In addition, since the pan bottom temperature sensor 13 contacts the inner pan 3 through the resin cover member 39, sensitivity falls. In other words, this is detected with a predetermined time delay with respect to the actual temperature change of the pan bottom temperature sensor 13 and is detected lower by a predetermined temperature. Therefore, various rice cooking controls are performed taking this predetermined value into consideration. In the present embodiment, the pan bottom temperature sensor 13 is disposed substantially at the center of the bottom surface 9a. However, the present invention is not limited to this position. The pan bottom temperature sensor 13 is a contact type, but is not limited to this. For example, a non-contact type sensor such as an infrared temperature sensor is used to cover the bottom surface 9a and the infrared temperature sensor with an infrared transmitting resin or the like. It is good also as a structure which carries out. By using such a non-contact type sensor, the sensitivity of the sensor is not lowered.

  In FIG. 4, a step portion 18 b for system integration is formed on the outer peripheral edge portion of the upper lid 18 over the entire circumference. When the lid body 2 is closed with respect to the rice cooker body 1, the step portion 18b fits inside the upper frame 6b of the upper case 6. At this time, as shown in FIG. 5, the outer peripheral surface of the stepped portion 18b crushes the packing 12 provided on the inner peripheral surface of the upper frame 6b. In this way, the pressure chamber 30 is formed by the lid 2 sealing the opening of the storage recess 10.

  As shown in FIG. 2, when the inner pot 3 is set in the pressure chamber 30, the three support portions in which the flange portion 3 b of the inner pot 3 is brought into contact with the upper end flange portion 8 a of the inner case 8. It is supported and set by the protrusion 8b. And when the inner pot 3 is set normally, a predetermined space is formed between the outer peripheral surface of the inner pot main body 3a, the accommodating recess 10 and the inner peripheral surface. And in the pressure chamber 30, the space inside the inner pot 3 and the space outside the inner pot 3 are connected by the space formed between the adjacent support protrusions 8b being a communication path. Therefore, even when there is a change in pressure in the pressure chamber 30, the magnitude of the pressure in both spaces is the same.

  FIG. 6 is a view for explaining the operation of the solenoid 16 which is a pressure adjusting means. A solenoid 16 that is a pressure regulating means (pressure regulator) has a built-in electromagnetic coil, and is fixed to a main body 16a for moving the plunger 16c in and out by a contracted spring and the magnetic force of the electromagnetic coil, and to the tip of the plunger 16c. And a pressure adjusting ball 16b. The main body 16a is energized to draw the pressure adjusting ball 16b (position indicated by a solid line in FIG. 6), and pushes out the pressure adjusting ball 16b without being energized (position indicated by a dotted line in FIG. 6). The pressure adjusting ball 16b is disposed above the passage opening 19a communicating with the pressure chamber 30, and is pressed by the plunger 16c before or at the beginning of cooking, and is in a state of being detached from the passage opening 19a (FIG. 6). (The position indicated by the middle dotted line). And at the time of pressure rice cooking, the internal pressure of the pressure chamber 30 is raised by being drawn into the solenoid 16 and closing the passage opening 19a with the weight of the ball. On the other hand, when the internal pressure of the pressure chamber 30 exceeds 20 kPa, for example, the steam in the pressure chamber 30 is discharged to the outside so as to lift the pressure adjusting ball 16b. The safety valve 17 works and discharges steam to the outside when the internal pressure of the pressure chamber 30 exceeds 25 kPa.

  In the electromagnetic induction heating rice cooker 100 having such a configuration, the user puts a desired number of cups of rice and an amount of water required for cooking the rice into the inner pot 3 and stores the inner pot 3. After setting in the recess 10, the desired rice hardness, cooking time, etc. are set by operating the operation panel 15, and the rice cooking switch is pressed. A microcomputer (not shown), which is a control means, performs a rice cooking operation by sequentially executing steps of preheating, rice cooking (pressure rice cooking), unevenness, and heat retention according to a stored program. The solenoid 16 which is a pressure regulating means (pressure regulator) is controlled by the microcomputer to raise the pressure in the pressure chamber 30 to a high boiling temperature, and to cook rice quickly, softly and deliciously with a small amount of electric power.

  As mentioned above, in the electromagnetic induction heating rice cooker 100 of this Embodiment, the lid | cover which is attached to the rice cooker main body 1 so that opening and closing is possible, seals the opening part of the accommodation recessed part 10, and forms the pressure chamber 30 with the accommodation recessed part 10. The body 2 and a solenoid 16 that is provided on the lid body 2 and maintains the pressure in the pressure chamber 30 at a high pressure are provided. Therefore, by accommodating the entire inner pot 3 inside the pressure chamber 30, the inner and outer pressures of the inner pot 3 can be made the same, and damage to the inner pot 3 and the exudation of moisture from the ingredients. Can be prevented.

  Note that the pressure adjusting means is not limited to the one using a solenoid, and for example, a weight may be simply provided on the passage opening 19a. However, this type of pressure regulator cannot be controlled electrically, so fine rice cooking control cannot be performed. In addition, in this Embodiment, although the solenoid 16 which is a pressure regulation means is provided in the cover body 2, the thing of the type provided in the rice cooker main body 1 may be sufficient.

  Moreover, in the electromagnetic induction heating rice cooker 100 of this Embodiment, in the pressure chamber 30, the space inside the inner pot 3 and the space outside the inner pot 3 are connected, and the magnitude | size of the pressure of both spaces is large. Since the pressure is the same in the space inside the inner pot 3 and the space outside the inner pot 3 because they are the same, the inner pot 3 is damaged or the moisture of the ingredients from the inner pot 3 oozes out. Can be reliably prevented.

  In the present embodiment, the material is porous, and more specifically, the inner and outer pressures are made the same for the inner pot 3 made of a charcoal fired body. It is possible to prevent moisture from leaking through the ingredients, and to fully demonstrate the performance of the rice cooker.

  Furthermore, the food cooked in the inner pot 3 is rice, and since it is equipped with a control means (microcomputer) that controls the heating by the heating coil 4 and pressure cooks the rice, it is fast and delicious with less power. You can cook rice.

  In addition, although this Embodiment is an electromagnetic induction heating rice cooker, this invention is not restricted to an electromagnetic induction heating rice cooker, The main body provided with the pot-shaped container and the accommodating part which accommodates a pot-shaped container, and a main body If it is a cooking-by-heating machine provided with the heating means which heats a pot-shaped container, it is applicable.

  The present invention is suitable for a heating cooker that heats and cooks food stored in a pot-shaped container, and in particular, a heating equipped with a pot-shaped container made of a fragile material such as charcoal, ceramic, glass, and earthenware. It is suitable for a cooking device, and is particularly suitable for application to an electromagnetic induction heating rice cooker equipped with an inner pan made of charcoal and using rice as a food material.

It is a cross-sectional view of the electromagnetic induction heating rice cooker which is the pressure heating cooker of embodiment which concerns on this invention. It is a perspective view which shows a mode that an inner pot is accommodated in the accommodation recessed part of a rice cooker main body. It is a cross-sectional view of the principal part for demonstrating the structure of the pressure chamber of a rice cooker main body. It is an enlarged view of A part of FIG. It is a figure which shows a mode that an accommodation recessed part and a cover body are connected airtightly by the effect | action of packing. It is a figure for demonstrating operation | movement of the solenoid which is a pressure regulation means.

Explanation of symbols

1 Rice cooker body (main body)
2 Lid 3 Inside pan (pan-shaped container)
4 Heating coil (heating means)
DESCRIPTION OF SYMBOLS 5 Main body case 6 Upper case 7 Lower case 8 Inner case 8a Flange part 8b Support protrusion 9 Coil stand 10 Receiving recessed part 12 Packing 13 Pan bottom temperature sensor 15 Operation panel 16 Solenoid (pressure regulator: pressure regulator)
17 Safety valve 18 Upper lid 19 Inner lid 20 Steam discharge device 20a Steam outlet 30 Pressure chamber 39 Resin cover member (sealing means)
100,110 Electromagnetic induction heating rice cooker

Claims (3)

A pressure heating cooker that cooks by raising the pressure chamber to a pressure equal to or higher than atmospheric pressure by suppressing the ejection of steam,
A pot-shaped container,
It said pot-like container and yield capacity, a body accommodating recess is provided you support,
A heating means provided in the main body for heating the pan-like container;
A lid body forming the pressure chamber to be <br/> and the accommodating recess openably attached to the main body sealing the opening of the accommodating recess,
Pressure adjusting means that is provided in any of the main body and the lid and maintains the pressure in the pressure chamber at a high pressure;
The accommodating recess comprises a flange portion having a predetermined width outwardly formed on the upper end thereof, and a plurality of support protrusions for supporting the pan-like container are formed on the flange portion,
The pot-shaped container is made of porous charcoal, and the pot-shaped container is made by solidifying powdered charcoal and firing it .
The pan-like container has a generally bowl-like shape, and has a flange portion formed in a bowl shape over the entire circumference from the opening thereof, and a plurality of flange portions of the housing recess are provided on the back surface of the flange portion. A pressure heating cooker, which is supported by the support protrusions of the container and is set in the housing recess . It further has a temperature sensor disposed in a sensor hole formed in the wall surface of the housing recess, and measures the temperature of the pan-like container, and the sealing means holds the pressure in the pressure chamber in the sensor hole. The pressure heating cooker according to claim 1, wherein: The food cooked in the pan-like container is rice,
The pressure heating cooker according to claim 1 or 2 , further comprising control means for controlling the heating by the heating means to pressure-cook the rice.

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