JP2012016422A - Rice cooker - Google Patents

Abstract

An energy-saving rice cooker is provided.
SOLUTION: A substantially bottomed cylindrical rice cooker main body 1 in which a pan storage portion 1a for storing a pan 2 is formed, a pan heating means 5 for heating the pan 2, and an opening 1f of the rice cooker main body 1 are covered. The lid body 3 includes a lid heating means 11 for heating the upper layer portion of the pan 2, a steam path 15 for exhausting water vapor generated during rice cooking to the outside, and rice cooking disposed in the steam path 15. A heat exchanger 16 that changes the water vapor that is sometimes generated into water, a steam generator 18 that converts water condensed by the heat exchanger 16 into superheated steam during boiling and unevenness in the rice cooking process, and the heat exchanger 16 And a condensed water path 20 connecting the steam generating means section 18, a steam inlet hole 22 for introducing superheated steam into the pan 2 in the steam generating means section 18, and a steam inlet 15 in the pot 2 during cooking rice. Exhaust holes 17 are provided for reducing the pressure. A value, it is possible to provide a rice cooker to cook delicious rice.
[Selection] Figure 1

Description

  The present invention relates to a rice cooker, and more particularly to a rice cooker using steam.

  Conventionally, as a rice cooker using this kind of water vapor, a water reservoir in the rice cooker, steam generating means for steaming the stored water, steam for heating the steam obtained by the steam generating means to superheated steam There is a heating means that uses the superheated steam as a heat source for cooking rice (see, for example, Patent Document 1).

JP 2004-321377 A

  However, in a conventional rice cooker as disclosed in Patent Document 1, a pan, a pan heating means for heating the pan, a lid covering the opening of the pan, and a steam generating means, The steam generating means is configured to inject steam into the pan from the opening of the pan. In a rice cooker that utilizes water vapor above the boiling point of this type of water, the following problems can be solved and rice can be cooked.

  In a general rice cooker, the water in the pot is almost lost in boiling rice and the subsequent rice cooking process, and the fluidity of rice is also lost. In the above process, it is necessary to continue the heating of the bottom and lid to promote gelatinization of the rice starch, so that it is necessary to cook rice deliciously. There are problems such as the rice upper layer being dried.

  However, in rice cookers that use steam, steam is first supplied by supplying superheated steam above the boiling point (100 ° C) of water under atmospheric pressure to the rice from above the opening of the pan. Without drying. In addition, when water is replenished at 100 ° C or lower, water adheres to the surface of the rice grains, resulting in watery rice with a high water content, but since it is water vapor at 100 ° C or higher, there is thermal energy that promotes gelatinization of rice starch, It can be improved.

  However, in the case of the above configuration, a large amount of heat energy is required for boiling water from room temperature to 100 ° C. by the steam generating means. Therefore, the power consumption which cooks rice becomes large compared with the rice cooking which does not have a steam generation means, and there exists a subject which cannot provide an energy-saving rice cooker to a customer.

  In addition, in cooking rice, the water in the pot is boiled at 100 ° C. to boil, so the steam released to the outside air during cooking is about 100 g, and the heat used by the pot heating means for heating the pot There was a problem that energy loss occurred.

  The present invention solves the above-mentioned conventional problems, arranges a heat exchanger that changes the water vapor generated during rice cooking to water, and heats the heat energy of water vapor generated during rice cooking to boiling or unevenness in the rice cooking process. At the same time, it is intended to provide a rice cooker that is converted to superheated steam and uses a heat source to save energy.

  In order to solve the above-described conventional problems, the rice cooker of the present invention includes a substantially bottomed cylindrical rice cooker body having a pot storage portion formed therein, a pot stored in the pot storage portion, and the pot And a lid body that covers the opening of the rice cooker body, and the lid body has lid heating means for heating the upper layer of the pan, and water vapor generated during rice cooking. Steam path for exhausting, heat exchanger arranged in the steam path to change the water vapor generated at the time of rice cooking to water, and water condensed by the heat exchanger at the time of boiling and unevenness in the rice cooking process A steam generating means section, a condensate water path connecting the heat exchanger and the steam generating means section, and a steam inlet hole for introducing superheated steam into the pan is provided in the steam generating section. Exhaust gas to reduce pressure in the pan during cooking The steam heat energy generated during rice cooking is converted into superheated steam during boiling and unevenness in the rice cooking process, and the heat source is utilized to improve the taste of rice and save energy. A rice cooker that measures can be provided.

  According to the rice cooker of this invention, the water vapor | steam which generate | occur | produces during rice cooking is condensed with the heat exchanger arrange | positioned at the lid | cover main body, and it changes to water. The obtained condensed water is converted into superheated steam by the steam generating means disposed on the lid body, and the thermal energy of the steam generated during cooking is utilized as the thermal energy necessary for the deliciousness of cooked rice. . Therefore, the heat energy for cooking rice is the sum of the heating means for heating the pan and the heat energy by steam, improving the taste of rice, and the heat energy of steam is heated by the lid during boiling and unevenness processes in the rice cooking process. During the operation of the means, the steam generating means portion is changed from water to superheated steam by the thermal energy of the lid heating means, so that rice can be cooked without using extra power consumption during rice cooking. As a further effect, water vapor generated during rice cooking is condensed and phase-changed into water, so the amount of water vapor released from the rice cooker to the outside air can be reduced or completely eliminated, and condensation on the rice cooker storage shelf can be prevented. It is possible to provide a rice cooker that can improve safety in consideration of dangers such as burns and burns.

The longitudinal cross-sectional view of the rice cooker in Embodiment 1 of this invention. The figure which shows the drive state of the temperature change of a pan in a rice cooking process of the rice cooker, and a heating apparatus (a pan heating means and a lid heating means). The longitudinal cross-sectional view of the rice cooker in Embodiment 2 of this invention The longitudinal cross-sectional view of the rice cooker in Embodiment 3 of this invention Partial top view of the rice cooker

  1st invention consists of the substantially bottomed cylindrical rice cooker main body in which the pan accommodating part was formed in the inside, the pan accommodated in the said pan accommodating part, the pan heating means which heats the said pan, and the said rice cooker A lid body that covers the opening of the body, the lid body includes a lid heating means for heating the upper layer of the pan, a steam path for exhausting water vapor generated during rice cooking, and the steam path A heat exchanger for changing the water vapor generated during rice cooking to water, steam generating means for converting the water condensed by the heat exchanger into superheated steam during boiling and unevenness in the rice cooking process, and the heat exchange A condensate water path connecting the steam generator and the steam generating means section, the steam generating means section having a steam inlet hole for introducing superheated steam into the pan, the steam path, the pressure in the pot during cooking rice Exhaust holes are arranged to reduce the amount during cooking. By converting the heat energy of the steam generated into superheated steam during boiling or unevenness in the rice cooking process, the heat source can be used to improve the taste of rice and provide a rice cooker that saves energy. .

The second invention, in particular, the heat exchanger of the first invention has a water storage part for storing water, water vapor generated during rice cooking is introduced into the water storage part and condensed into water, The condensed water obtained during the water storage and cooking is used as superheated steam, and the superheated steam is used as a heat source during cooking or / and heat retention. In addition to the effect of the first invention, it occurs during cooking. Since water vapor is changed into water before being released to the outside air, no vapor is generated. Therefore, it is possible to provide a rice cooker that can improve safety in consideration of the risk of burns and the like.

  According to a third aspect of the present invention, in particular, the heat exchanger of the first aspect of the present invention cools water vapor with the outside air taken in and condenses it into water. In addition to the effects of the first invention, the amount of water vapor generated during rice cooking can be reduced to the outside air, so that water droplets adhering to the storage shelf for storing the rice cooker can be used. A rice cooker that can reduce the amount and prevent corrosion can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of the rice cooker in Embodiment 1 of the present invention, and FIG. 2 shows the temperature change of the pan and the driving state of the heating device (pan heating means and lid heating means) in the rice cooking process of the rice cooker. FIG.

  As shown in FIG. 1, the rice cooker concerning this Embodiment is the substantially bottomed cylindrical rice cooker main body 1 in which the pan accommodating part 1a was formed, and the pan 2 accommodated in the pan accommodating part 1a. The lid main body 3 attached to the rice cooker main body 1 so as to be able to open and close the opening 1f of the rice cooker main body 1 and the inner side of the lid main body 3 (the side covering the opening 2a of the pan 2) are detachably attached. A substantially disk-shaped inner lid 4 capable of sealing the opening 2a of the pan 2 and a pan heating means 5 for heating (induction heating) the pan 2 are provided.

  The pot storage portion 1 a of the rice cooker body 1 has a bottomed cylindrical shape corresponding to the shape of the substantially annular upper frame 1 b fitted into the inner peripheral portion of the opening 1 f at the top of the rice cooker body 1 and the pot 2. And a coil base 1c integrally connected to the upper frame 1b at the upper opening side end.

  An inner bottom heating coil 5a and an outer bottom heating coil 5b constituting the pot heating means 5 are attached to the outer peripheral surface of the coil base 1c. The bottom heating coil 5a is arranged so as to face the periphery of the center of the bottom of the pan 2 via the coil base 1c, and the outside bottom heating coil 5b is a corner of the bottom of the pan 2 via the coil base 1c. It arrange | positions so that a part may be opposed.

  An opening 1g is provided in the central portion of the bottom of the coil base 1c. A pan temperature sensor 6, which is an example of a pan temperature detection unit for measuring the temperature of the pan 2, is disposed in the opening 1 g so as to be able to contact the bottom of the pan 2.

  In the rice cooker main body 1, a control unit 7 for performing rice cooking by driving and controlling each unit and each device is installed. The control unit 7 performs drive control of each unit and each device in accordance with a user instruction performed using the operation unit 8 provided on the lid body 3.

  A hook 1 d that can be engaged with the hook 9 of the lid body 3 is provided on the upper part of the front wall of the rice cooker body 1 (upper left side in FIG. 1). A spring 1e is provided between the hook 1d and the upper frame 1b. The hook 1d is biased forward (left side in FIG. 1) by a spring 1e.

  The lid body 3 is provided with an inner lid temperature sensor 10, which is an example of an inner lid temperature detection unit, a lid heating means 11 for heating the upper layer portion of the pan 2, and a hinge shaft 12. The inner lid temperature sensor 10 is provided so as to be able to contact the inner lid 4 and is configured to be able to detect the temperature of the inner lid 4.

  The lid heating means 11 is composed of a heating coil disposed in the lid body 3 so as to face the opening 2 a at the upper part of the pan 2 through the inner lid 4, and the inner lid 4 is controlled by the control unit 7. Induction heating. The hinge shaft 12 is an opening / closing shaft of the lid main body 3, and both ends of the hinge shaft 12 are rotatably supported by the upper frame 1 b of the rice cooker main body 1. The lid body 3 is urged in a direction to rotate away from the opening 1 f of the rice cooker body 1 by a rotating spring (not shown) such as a torsion coil spring provided in the vicinity of the hinge shaft 12.

  A part of the inner lid 4 is made of a metal such as ferritic stainless steel capable of induction heating. In order to discharge the steam generated in the pot 2 to the outside of the pot 2, the inner lid 4 is provided with a steam port 4a composed of a plurality of holes. A substantially annular pan packing 13 that is in close contact with the pan 2 when the lid main body 3 is in a closed state is attached to the surface of the outer peripheral portion of the inner lid 4 on the pan 2 side. The pot packing 13 is made of an elastic body such as rubber.

  The lid body 3 has a display unit 14 including a liquid crystal display for displaying various information such as a rice cooking menu and a rice cooking time, and instructions for selecting a rice cooking menu, starting rice cooking, canceling, and executing reservations. An operation unit 8 is provided. The operation unit 8 includes a plurality of buttons (not shown) such as a rice cooking start button. The user can cook rice by instructing the start of cooking with the operation unit 8 while referring to the display content of the display unit 14. The control unit 7 that has received an instruction to start cooking rice controls (drives) the pot heating unit 5 and the lid heating unit 11 based on the stored rice cooking program and the detected temperatures of the pan temperature sensor 6 and the inner lid temperature sensor 10. (Or stop) and execute the rice cooking process.

  Further, the lid body 3 is provided with a steam path 15 for exhausting water vapor generated by boiling of the water in the pot 2 to the outside air. The steam path 15 is provided with a heat exchanger 16 that condenses water vapor generated during rice cooking and changes the phase to water. Further, the steam path 15 is provided with an exhaust hole 17 for reducing pressure during rice cooking in the pan 2 and a hole 19 for sending the condensed water obtained by the heat exchanger 16 to the steam generating means section 18. Has been established.

  Next, in order to send condensed water to the steam generation means section 18, a condensed water path 20 that connects the heat exchanger 16 and the steam generation means section 18 is provided. The condensed water obtained by the heat exchanger 16 has a structure in which the condensed water path 20 falls by its own weight from the hole 19 provided in the steam path 15 and drops onto the steam generating means section 18. In this case, the height of the lid body 3 is increased, the overall height of the product body is increased, and it becomes difficult to realize a compact rice cooker.

  Moreover, since the weight of the lid body 3 is also increased, it is difficult to make the opening / closing configuration of the lid body 3 complicated and to ensure the strength.

  Further, all the water condensed in the steam path 15 is sent to the steam generating means unit 18 during rice cooking, and after the completion of rice cooking, the condensate does not remain in the steam path 15, but it is completely steam generating means. Cannot be guaranteed to be sent to part 18. Therefore, the water remaining in the steam path 15 is sterile because it is distilled water from water vapor, but assuming a long-term standing state from the end of cooking to the next cooking, The problem of mold breeding cannot be wiped out.

  Therefore, in this Embodiment, the pump 21 can be arrange | positioned in the condensed water path | route 20, and the condensed water in the vapor | steam path | route 15 can be reliably sent to the steam generation means part 18, and after completion | finish of rice cooking, the vapor | steam path | route 15 is provided. The inside is completely dry, and it can prevent the generation of bacteria and the growth of mold caused by condensed water.

Moreover, the height of the lid body 3 can be lowered when compared with the case where the pump 21 is not provided. Therefore, the total height of the product is also reduced, and the product can be made compact. Furthermore, since the weight of the lid body 3 can be reduced, the opening / closing mechanism of the lid body 3 is simplified and the strength is ensured.

  Next, the operation of the rice cooker in the present embodiment will be described with reference to FIGS. FIG. 2 is a diagram showing a temperature change of the pan in the rice cooking process and a driving state of the heating device (the pan heating means 5 and the lid heating means 11).

  First, when rice and water are set in the pan 2 by the user and the rice cooking menu is selected by the operation unit 8, when the start of rice cooking is instructed, the rice cooking process is started by the control of the control unit 7. . Here, the rice cooking step is mainly composed of four steps of a pre-cooking step (also referred to as an immersion step), a temperature raising step (also referred to as a cooking step), a boiling maintenance step, and a steaming step. .

  During these steps, gelatinization of rice is promoted and rice is cooked. In this rice cooking process, the control unit 7 controls the heating operation of the pot heating means 5 and the lid heating means 11 according to the detected temperature of the pot temperature sensor 6 and the inner lid temperature sensor 10 and the rice cooking program corresponding to the rice cooking menu. Is done.

  In this Embodiment 1, the some rice cooking menu is prepared according to the kind of rice, etc., and the rice cooking program according to the said each rice cooking menu is memorize | stored in the control part 7. FIG. When the rice cooking process is started, first, the pre-cooking process is started.

  The pre-cooking process is a process in which the rice is absorbed by keeping the water at a constant temperature. In this pre-cooking step, the control unit 7 controls the temperature of the pan 2 so that the temperature of the water in the pan 2 does not exceed the temperature at which the gelatinization of rice begins (about 60 ° C.). The pan heating means 5 and the lid heating means 11 are controlled based on the temperature detected by the temperature sensor 10. Thereby, water absorption of rice is promoted.

  When a preset time has elapsed from the start of the pre-cooking process, the process proceeds to the temperature raising process. The temperature raising step is a step in which the pot 2 is heated at once by the pot heating means 5 and the lid heating means 11 to bring the water in the pot 2 into a boiling state (about 100 ° C.). In this temperature raising step, the controller 7 controls the driving of the pot heating means 5 and the lid heating means 11 so that the pot 2 is rapidly ripened to bring the water in the pot 2 into a boiling state.

  When the temperature detected by the pan temperature sensor 6 reaches about 100 ° C. by performing the temperature raising step, the process proceeds to the boiling maintaining step. The boiling maintaining step is a step of gelatinizing rice starch to raise the degree of gelatinization to about 60%. In this boiling maintenance step, the controller 7 controls the pan heating means 5 and the lid heating means 11 so as to maintain the boiling state of the water in the pot 2. More specifically, the control unit 7 performs duty control that repeats driving and stopping of the pot heating unit 5 and the lid heating unit 11 at regular time intervals, and intermittently heats the pot 2.

  In this temperature raising step, water is continuously boiled, so that a large amount of steam at about 100 ° C. is generated. When the inside of the pan 2 is filled with the generated steam, excess steam passes through the steam port 4 a of the inner lid 4 and flows into the steam path 15. The steam that has flowed into the steam path 15 is condensed by the heat exchanger 16 and changes into water.

At this time, if the heat exchanger 16 has a high exchange rate, about 80 g of condensed water is obtained in the step of maintaining boiling of cooked rice, and the pump 21 is disposed in the condensed water path 20. Therefore, all of the condensed water can be sent to the steam generation means unit 18. In addition, since steam does not leak from the exhaust hole 17 for reducing the pressure during rice cooking in the pan 2 disposed in the steam path 15, it also leads to the realization of a steamless rice cooker. However, if the heat exchanger 16 has a low exchange rate, the amount of condensed water in the boiling maintenance process of the cooked rice is about 10 to 20 g, and the remaining about 60 g of water vapor enters the steam path 15. Leakage from the disposed exhaust hole 17 makes it impossible to realize a steamless rice cooker.

  Here, generation of superheated steam will be described.

  In the boiling maintaining process and the steaming process of the cooked rice, it is preferable to give heat to the rice from the entire surface. The pot heating means 5 and the lid heating means 11 are used to heat the pot 2 and the inner lid 4 to cook rice. Continuing to maintain the heating and making it a cooking method similar to traditional Japanese rice cake cooking can accelerate the gelatinization of rice and cook it into sweet and delicious rice, but maintain the heating of the rice If you continue, the portion of the rice that is in contact with the pot 2 will be burnt and eat less.

  However, according to the present embodiment, the lid heating unit 11 heats the inner lid 4 and the steam generation unit 18 and changes the condensed water fed by the pump 21 of the condensed water path 20 to superheated steam. By adding superheated steam into the pot 2 from the steam input hole 22 provided in the inner lid 4 during the boiling maintaining process and the steaming process, the rice can be cooked deliciously without burning.

  By using the configuration as described above, the heating of the lid heating means 11 heated during the boiling maintaining process and the steaming process of the conventional rice cooker can generate superheated steam, and thus a superheated steam steamed rice cooker that saves energy. Can be realized.

  In addition, it is not necessary for the customer to prepare water for the superheated steam, and since condensed water does not remain in the steam path 15 after the completion of cooking, superheated steam can be generated in mentales.

  Here, if it is a device with a high exchange rate of the heat exchanger 16, about 80g of condensation can be obtained, and the amount of superheated steam used with the heat source during cooking can be adjusted in each step of cooking rice. The boiled rice can be hardened or softened. Moreover, also about the temperature of superheated steam, it can adjust temperature according to the hardness of rice at 130 to 300 degreeC.

(Embodiment 2)
FIG. 3: has shown the longitudinal cross-sectional view of the rice cooker concerning Embodiment 2 of this invention. In addition, the same code | symbol is attached | subjected to the part same as the rice cooker in the said Embodiment 1, and the description is abbreviate | omitted.

  Since the basic structure of the rice cooker of this Embodiment is the same as that of the rice cooker in the said Embodiment 1, description of the part is abbreviate | omitted.

  The lid main body 3 of the rice cooker in the present embodiment is configured such that a water reservoir 23 is disposed on the upper surface of the lid main body 3 and water is poured into the water reservoir 23. The water storage unit 23 is configured to be detachable from the lid body 3, and the customer puts water into the water storage unit 23 before starting rice cooking.

  The water in the pot 2 boils, and the generated water vapor passes through the steam path 15 and the steam path B24, and then the steam hole A25 and the water storage part arranged in the storage part of the water storage part 23 of the lid body 3. It passes through a steam hole B26 disposed at the bottom of the water 23 and is put into the water of the water storage part 23.

  In the steam path B24, an electromagnetic valve 27 is disposed, and the electromagnetic valve 27 is closed until the boiling maintaining process of the rice cooking process is started, and the water stored in the water storage unit 23 is dropped into the pan 2. It is preventing.

  And when the boiling maintenance process of a rice cooking process starts, the said electromagnetic valve 27 is opened and it is set as the structure by which water vapor | steam is thrown in in the water storage part 23. FIG. However, since water vapor is not always generated in the boiling maintaining process depending on the amount of cooked rice, the electromagnetic valve 27 opens the valve when water vapor is generated in time with the presence or absence of water vapor. When this is not occurring, it is necessary to close the valve. Moreover, even if it takes such a structure, although there exists a possibility of dripping in the pot 2, dripping in the pot 2 can be prevented by making the vapor | steam path | route B24 into the path | route shape of a U-shaped pipe. .

  However, if the path shape of the U-shaped tube is used, there is a risk of spoilage or the generation of a strange odor with the remaining water. Therefore, the path of the U-shaped tube should be a metal path and heated after the completion of rice cooking. Measures to evaporate are required.

  The water vapor introduced into the water storage unit 23 condenses and phase-changes into water. If the temperature of the water in the water storage unit 23 after the completion of the boiling maintenance process is 100 ° C. or lower, the pot 2 in the boiling maintenance process. About 100% of water vapor generated from the inside can be condensed, and about 80 g of water can be obtained.

  By adopting such a configuration, steam does not leak from the exhaust hole 28 provided in the upper surface portion of the water storage section 23, so that a steamless rice cooker can be realized.

  Due to the above phenomenon, the water stored in the water storage unit 23 at the start of cooking rice is changed to hot water at the end of the boiling maintenance process.

  Hot water in the water storage section 23 is transferred from the condensed water discharge hole A29 of the water storage section 23 storage section disposed on the upper surface of the lid body 3 and the condensed water discharge hole 30 disposed at the bottom of the water storage section 23 to the condensed water path 20. Discharged. At that time, the amount of the hot water in the water storage unit 23 discharged to the condensed water path 20 can be adjusted by the pump 21 by the time for opening the path. The hot water discharged to the condensed water path 20 is transported to the steam generating means section 18 to generate superheated steam and is put into the pot 2 from the steam inlet hole 22 of the inner lid 4. Since the effect of superheated steam on rice cooking is the same as that of the first embodiment, description thereof is omitted.

  By taking the configuration of the lid body 3 configured as described above, since it is hot water that is carried to the steam generation means unit 18, compared with the configuration of the rice cooker in the first embodiment, The work of the lid heating means 11 for heating the steam generating means section 18 to make superheated steam is small, and energy for making the superheated steam into a large amount of heat generated during cooking in the pot 2 It is possible to realize a superheated steam rice cooker that can save energy.

  The amount of superheated steam in the rice cooker in the present embodiment can be adjusted by the pump 21 disposed in the condensed water path 20, and at the same time, the heat energy of a large amount of steam generated during rice cooking was used. Compared with the configuration of the rice cooker in the first embodiment, the temperature of the superheated steam can be easily increased, and the rice can be cooked with superheated steam having a large amount of heat of 200 ° C to 300 ° C. .

(Embodiment 3)
FIG. 4 is a longitudinal sectional view of a rice cooker according to Embodiment 3 of the present invention, and FIG. 5 is a partially cut-out top view of the rice cooker. In addition, the same code | symbol is attached | subjected to the part same as the rice cooker in the said embodiment, and the description is abbreviate | omitted.

  Since the basic structure of the rice cooker of this Embodiment is the same as that of the rice cooker in the said Embodiment 1, description of the part is abbreviate | omitted.

  The structure of the lid body 3 of the rice cooker in the present embodiment is an example of a heat exchanger.

  4 and 5, the rice cooker in the present embodiment includes a heat sink 31 made of metal such as aluminum in the steam path 15 and a blower 32 that is arranged near the heat sink 31 and sends air to the heat sink 31. Further, an intake hole 33 for taking in outside air at the intake portion of the blower 32 is disposed on the outer surface portion of the lid body 3.

  The water vapor generated from the pot 2 passes through the steam port 4 a disposed in the inner lid 4 and fills the steam path 15.

  The air (outside air) taken in from the intake hole 33 by the blower 32 is -5 ° C to 40 ° C even in consideration of the four seasons in Japan. Further, since the heat sink 31 has a heat capacity, the water vapor generated from the inside of the pan 2 by rice cooking is generated on the surface portion of the heat sink 31 when the temperature of the heat sink 31 is equal to or lower than the temperature of water vapor passing through the vapor path 15. Condensate and become water droplets. In order to make the temperature of the heat sink 31 always lower than the temperature of water vapor passing through the steam path 15, the blower 32 is provided.

  With the configuration as described above, the water vapor passing through the vapor path 15 is condensed by the heat capacity of the heat sink 31 and the air sucked by the blower 32, so that the water vapor can be generated and distilled water can be generated. The air is discharged from the exhaust hole 17 disposed in the steam path 15 to the outside air. The function of changing the condensed water generated in the steam path 15 to superheated steam and cooking rice deliciously is the same as the rice cooker in the first embodiment and the second embodiment, and thus the description thereof is omitted. .

  By adopting the configuration of the lid body 3 as described above, the amount of water vapor released to the outside air can be reduced as compared with a configuration in which no heat exchanger is present. Condensation can be prevented, and the progress of corruption can be prevented.

  In addition, by reducing the absolute amount of water vapor and the blower 32, it is possible to provide a rice cooker that reduces the water vapor discharge temperature and considers safety. In addition, although the example of Embodiment 2 and 3 was described to the technical means of the heat exchanger, the effect of this invention converts the water vapor | steam which generate | occur | produces during rice cooking into superheated steam, energy saving and cooking rice deliciously. Therefore, the means for condensing the generated water vapor is not limited to that described in the above embodiment.

  As described above, the rice cooker according to the present invention changes the water vapor in the pan generated during rice cooking into water with a heat exchanger, and uses the phase-changed water as heated steam to heat the rice and heat. It can be used to cook delicious rice with less energy and can be applied to various types of rice cookers for home and business use.

DESCRIPTION OF SYMBOLS 1 Rice cooker main body 1a Pan accommodating part 1f Opening part 2 Pan 3 Lid main body 5 Pan heating means 11 Lid heating means 15 Steam path 16 Heat exchanger 17 Exhaust hole 18 Steam generating means part 20 Condensate water path 22 Steam inlet hole

Claims (3)

Covers the substantially bottomed cylindrical rice cooker body having a pot storage part formed therein, the pot stored in the pot storage part, the pot heating means for heating the pot, and the opening of the rice cooker body A lid body, a lid heating means for heating the upper layer portion of the pan, a steam path for exhausting water vapor generated during rice cooking to the outside, and a steam path disposed in the steam path and generated during rice cooking A heat exchanger for changing the phase of water vapor to water, a steam generating means for converting the water condensed by the heat exchanger to superheated steam when boiling rice and when cooking, the heat exchanger and the steam generating means A condensate water path connecting the steam generating means part with a steam inlet hole for introducing superheated steam into the pan, and an exhaust hole for reducing the pressure in the pot during cooking with the steam path. Rice cooker with each of them. The heat exchanger has a water storage unit for storing water, and water vapor generated during rice cooking is introduced into the water storage unit to condense into water, and the condensed water obtained during the water storage and rice cooking is overheated. The rice cooker according to claim 1, wherein steam is used and the superheated steam is utilized as a heat source during rice cooking and / or heat retention. The heat exchanger cools the steam with the outside air taken in and condenses it into water, converts the condensed water into superheated steam, and uses the superheated steam as a heat source during cooking or / and heat retention. Item 9. A rice cooker according to item 1.