JP2009285231A - Rice cooker - Google Patents

Abstract

【Task】
Provided is a rice cooker that steams after the end of rice cooking, supplies steam into the inner pot during heat insulation, steams rice deliciously with the steam, and humidifies with steam during heat insulation.
[Solution]
An outer lid 2 that covers the upper surface opening of the main body 1, an inner pot 3 that is detachably accommodated in the main body 1, an inner lid 4 that covers the upper part of the inner pot 3, and an inner lid steam provided on the inner lid 4 The outer lid 2 has a passage 7, an outer lid steam passage 8 provided in the outer lid 2, and limiting means 9 for restricting the passage of steam between the outer lid steam passage 8 and the inner lid steam passage 7. Is a rice cooker equipped with a lid heating means 10 for heating the inner lid 4, provided with a dew receiving tray 5 covering the substantially entire surface of the inner lid 4 on the lower surface of the inner lid 4, and the dew receiving tray 5 has a smaller heat capacity than the inner lid 4. The outer peripheral surface is in close contact with the lower surface of the inner lid 4 via the seal packing 5d, and the dew receiving tray 5 protrudes toward the inner lid 4 at a position closer to the inner lid steam passage 7 side than the outer circumferential side. And a plurality of steam flow passages 5j are provided along the ring shape in the bulging portion 5i.
[Selection] Figure 4

Description

  The present invention is provided with a dew condensation receiving part for storing dew condensation water generated during rice cooking in an inner pot housed in the main body, steamed rice with steam generated from the dew condensation receiving part during steaming and heat retention, The present invention relates to a rice cooker that reduces drying of rice.

  In order to cook delicious rice and reduce drying during heat insulation, rice cookers that send steam into the inner pot have been proposed.

  As such a rice cooker, a water tank (water storage part) is provided in a part of the main body or the inner pot, water is put into the water tank before the start of rice cooking, and steam is heated by heating the water tank with heating means. Generates and supplies the steam to the space in the inner pan, and a dish-shaped dew receiving portion is provided on the lower surface of the inner lid that closes the upper surface opening of the inner pan, and is generated in the inner pan as rice cooks It is known that steam is accumulated in the dew receiving part, and the dew receiving part is heated by a heat retaining heater at the time of heat retention to heat water accumulated therein and to be supplied as steam into the inner pot.

  Patent documents 1, 2, 3 and the like are known as the former method, and patent documents 4, 5 and the like are known as the latter method.

  Specifically, each of the above patent documents will be described in Patent Document 1 in which a water tank (water storage unit) and a water tank heating means for heating the water tank are provided in the main body or the outer lid. Steam generated by heating by the tank heating means is supplied from the upper part of the water tank into the inner pot through a steam pipe, and a water storage part and a heating means for the water storage part are provided at the bottom of the inner pot, the heating means It is the structure which conveys the vapor | steam from the water storage part which generate | occur | produced by being heated by the inside of an inner pot through a steam pipe.

  Further, in Patent Documents 2 and 3, a lid heating means is attached to the upper surface of the inner lid that covers the upper opening of the inner pot, and a water tank (water storage container) is detachably attached to the lower surface. The water tank is heated together with the lid, and steam is supplied into the inner pot from a water supply / steam port provided in the water tank.

  Further, in Patent Documents 4 and 5, the inner lid that covers the upper opening of the inner pot, the outer lid provided on the upper surface of the inner lid, and the inner lid that is suspended from the lower surface of the outer lid are inserted through the inner lid. It is equipped with a support shaft and a dish-shaped dew tray positioned below the inner lid and fixed to the support shaft. The steam generated in the inner pan during rice cooking is stored in the dew pan, and is appropriately vaporized during heat insulation to the inner pot. It is the structure which supplies.

JP 2003-144308 A JP 2007-325681 A JP 2007-313138 A Japanese Utility Model Publication No. 57-140209 JP-A-57-209016

  In the above-described prior art, what is shown in Patent Document 1 is that a water tank is provided in the main body or the outer lid, or a water storage part is provided in the bottom of the inner pot, and those shown in Patent Documents 2 and 3 are also included. Since the water tank is detachably attached to the lower surface of the inner lid that covers the upper opening of the inner pot, it is necessary to put water in the water tank before cooking rice. When water was not added, such as forgetting to add water to the water tank before cooking, it was impossible to reduce the drying of the rice by supplying steam into the inner pot during the heat insulation.

  Moreover, when supplying vapor | steam from the water tank to the upper part of an inner pot with patent documents 1, 2, and 3, since the vapor | steam jet outlet opened only to a part of upper part of the inner pot, it ejected from the steam jet outlet. A large amount of steam was supplied to a part of the inner pot, and the entire inner pot could not be filled with steam, and the part not supplied with steam sometimes dried.

  Moreover, as for the thing shown in patent documents 4, 5, the dew pan attached to the inner pot side center part of the inner lid is very small compared with the area of the whole inner lid, and the whole lower surface of the inner lid was exposed in the inner pot. In addition, since a gap is formed between the entire circumference of the outer peripheral surface of the dew pan and the lower surface of the inner pan, both the inner lid and dew pan during cooking are the same due to the high-temperature steam generated from the inner pan. It is heated to a temperature and does not condense, and the high-temperature steam is discharged out of the main body through a steam vent hole opened on the center side of the inner pot. As a result, dew condensation water did not accumulate in the dew tray, and steam could not be supplied into the inner pan during heat insulation to reduce rice drying.

  The present invention has been made to solve the above-described conventional problems. In claim 1, the main body, an outer lid that covers the upper surface opening of the main body, and an inner housing that is detachably accommodated in the main body. A pan, an inner lid covering the upper opening of the inner pan, an inner lid steam passage provided in a substantially central portion of the inner lid, an outer lid steam passage provided in the outer lid, and the outer lid steam A rice cooker having a restriction means for restricting the passage of steam between a passage and the inner lid steam passage, and the outer lid is provided with a lid heating means for heating the inner lid; A dew condensation tray that covers almost the entire surface of the inner lid is provided, the dew condensation tray is made of a material having a smaller heat capacity than the inner lid, and its outer peripheral surface is in close contact with the lower surface of the inner lid via a seal packing, and the dew condensation The saucer has a substantially ring shape protruding from the outer peripheral side to the inner lid side at a position closer to the inner lid steam passage side. Has a bulging portion, is provided with a plurality of vapor passage along the ring shape bulging portion.

  According to a second aspect of the present invention, the plurality of steam flow passages provided in the bulging portion of the dew condensation tray are provided at positions that do not face the inner lid steam passage provided in the inner lid.

  According to the present invention, the steam generated during rice cooking is condensed on the lower surface of the inner lid, the condensed water is collected as water droplets in the condensation tray, and the water is used during steaming and heat retention to form steam. In addition, it is not necessary to add water every time before cooking rice, and there is little labor, and it is possible to realize a rice cooker that can cook and keep warm using steam.

  Further, the dew receiving tray provided on the lower surface of the inner lid has a substantially ring-shaped bulging portion protruding toward the inner lid side at a position closer to the inner lid steam passage side than the outer peripheral side, and the bulging portion includes Since a plurality of steam flow passages are provided along the ring shape, the condensed water accumulated in the condensation tray spreads over the entire surface of the condensation tray along the substantially ring-shaped bulge. Since the steam that spouts out into the inner pot along the ring shape, it is uniformly supplied to the entire inner pot, and the entire inner pot can be filled with steam, preventing the rice from drying and keeping it warm. be able to.

  Furthermore, since the steam flow passage is provided in the bulging part of the dew condensation tray, the condensed water collected in the dew condensation tray can be dripped from the steam flow passage into the inner pot even if the outer lid is opened to dress rice. If the outer lid is closed again without wetting the main body, it can be effectively used to humidify the inside of the inner pot with steam and suppress the drying of the rice.

  In addition, since the steam flow passage of the dew condensation tray is provided at a position that does not face the inner lid steam passage, the steam does not go straight out of the inner lid steam passage, and the steam flows into the gap between the dew tray and the inner lid. The steam that has been filled into water drops and accumulates on the dew receiving tray, and can be supplied as steam to the inner pot, which can be used to prevent the rice from drying.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of the whole rice cooker according to the present invention, and FIG. 2 is a view showing the flow of steam during rice cooking in the longitudinal sectional view. FIG. 3 is a view showing the flow of steam during heat insulation in the longitudinal sectional view. FIG. 4 is a central longitudinal sectional view of the lid portion, and FIG. 5 is a partially broken perspective view showing the internal structure of the lid portion. FIG. 6 is an exploded perspective view of the lid portion as seen from above. FIG. 7 is an exploded perspective view of the lid portion viewed from the left side.

  In the figure, the main body 1 of the jar rice cooker is provided with a protective frame 11 whose upper surface is open on the inside, and an inner pot 3 is detachably accommodated in the protective frame 11.

  The inner pot 3 has a bottomed cylindrical shape, and its upper end is bent substantially horizontally so that it can be easily attached and detached from the main body 1.

  Heating means 12 including a bottom surface heating coil for induction heating the bottom surface portion of the inner pot 3 and a side surface heating coil for induction heating the side surface portion is provided on the outer bottom surface portion and the outer side surface portion of the protective frame 11.

  An outer lid 2 that covers the upper surface opening is attached to the upper surface opening of the main body 1 so as to be openable and closable. An inner surface made of a stainless steel plate that closes the upper surface opening of the inner pot 3 is attached to the lower surface of the outer lid 2. The lid 4 is attached via a seal packing 4e. The inner lid 4 may be integrated into the outer lid 2, and as shown in FIG. 7, detachable members 4a and 4b are provided on the upper and lower sides of the outer peripheral surface to provide a lower surface receiving portion (see FIG. (Not shown) may be detachably attached.

  A condensation tray 5 is detachably attached to the lower surface of the inner lid 4 so as to cover almost the entire surface of the inner lid 4. The dew receiving tray 5 is made of an aluminum plate, and includes a plate portion 5a whose upper and lower surfaces are coated with fluororesin, and a resin frame 5c and a frame 5c that are fitted into a rising wall 5b on the outer periphery of the plate portion 5a. The seal packing 5d is fitted to the inner peripheral wall surface, and the seal packing 5d is bent on the lower surface of the inner lid 4 by bending the tip portion protruding from the inner peripheral wall surface of the frame 5c in the center direction of the dish portion 5a. It is in close contact. Therefore, a gap 6 is formed between the lower surface of the inner lid 4 and the dew receiving tray 5. In addition, a water reservoir 5e that receives condensed water dripping from the inner lid 4 and the dish portion 5a when the outer lid 2 is opened is formed in the bent portion of the seal packing 5d.

  The seal packing 5d described above does not necessarily need to be fitted into the inner peripheral wall surface of the frame 5c, and may be fixed by other methods. In short, the seal packing 5d is located on the inner wall side of the rising wall 5b of the dish portion 5a. It is only necessary to receive dew condensation water dripping from the dish portion 5a when the outer lid 2 is opened.

  As shown in FIGS. 5, 6, and 7, the attachment / detachment structure of the dew receiving tray 5 is provided with an upper receiver 4 c in the upper part of the outer periphery of the inner lid 4 and a lower receiver 4 d in the lower part, An upper hook 5g urged upward by a spring 5f is provided at the upper part of 5c, and a lower hook 5h is provided at the lower part, and the lower hook 5h of the condensation tray 5 is fitted into the lower holder 4d of the inner lid 4. Thereafter, the upper hook 5g is pushed down against the spring 5f to fit into the upper holder 4c of the inner lid 4, and is returned upward by the spring 5f so as not to come off the upper holder 4c.

  Further, the dew receiving tray 5 is made of an aluminum plate as described above, and has a lower specific heat, weight, thickness, and heat capacity of the material than the inner lid 4 made of a stainless steel plate, and is easily warmed.

  Further, the dew receiving tray 5 is provided with a bulging portion 5i projecting toward the inner lid 4 at a substantially intermediate position in the radial direction continuously along the circumferential direction, and a plurality of small holes formed along the circumferential direction on the upper surface thereof. Individual steam flow passages 5j are provided.

  Reference numeral 7 denotes an inner lid steam passage provided in the inner lid 4, which is configured not to face the steam flow passage 5j of the dew receiving tray 5 and to be smaller than the entire opening area of the steam flow passage 5j. .

  Further, the inner lid steam passage 7 is connected to an outer lid steam passage 8 provided in the outer lid 2, and a restricting means 9 is provided between the passages, and the restricting means 9 allows the condensation pan to be received from the inner pot 3. 5, The passage of the steam that goes out to the outer lid steam passage 8 through the inner lid steam passage 7 is restricted.

  The restricting means 9 may be one that mechanically opens and closes the passage, or may restrict passage of steam by the weight of the sphere and the pressure of the passing steam, using a sphere that closes the passage. . In the figure, the structure of a small hole and a sphere that closes the small hole is shown.

  The outer lid 2 is provided with a lid heating means 10 for heating the inner lid 4 and also for heating the dew receiving tray 5 through the inner lid 4.

  13 is a temperature sensor that detects the temperature of the bottom surface of the inner pot 3, and 14 is a control circuit that is arranged in the lower space in the main body 1, and is based on temperature information from the temperature sensor 13, heating means 12, lid heating The energization state of the means 10 is controlled.

  The present embodiment has the above configuration, and the operation thereof will be described next.

  When the user puts an appropriate amount of rice and water into the inner pot 3 and closes the outer lid 2, the inner lid 4 closes the upper portion of the inner pot 3, resulting in a sealed space. At this time, this space also includes a gap 6 formed by the inner lid 4 and the dew receiving tray 5.

  Thereafter, when the user performs a rice cooking operation, rice cooking is started, the heating means 12 is energized, and the inner pot 3 is heated. However, at this time, the lid heating means 10 is not energized.

  Steam (low temperature steam) is generated from the time when the inside of the inner pot 3 exceeds 60 ° C., and condensation occurs due to the temperature difference by touching the inner peripheral surface of the inner pot 3. Since the surface of the dew receiving tray 5 facing the inner pot 3 receives heat due to dew condensation, the temperature of the dew receiving tray 5 rises in a state close to the temperature of hot water inside the inner pot 3.

  At this time, the inner lid 4 is almost entirely covered with the dew receiving tray 5 and is not exposed to steam (low temperature steam), and the frame 5c of the plate portion 5a is made of resin, so that the dew is formed. Although radiant heat from the tray 5 is received, the heat conduction from the condensation tray 5 is small, and the temperature is lower than that of the condensation tray 5.

  Eventually, when the inside of the inner pot 3 boils, steam (100 ° C.) is generated and the pressure increases, and the steam flows from the steam flow passage 5j of the condensation tray 5 into the gap 6 formed by the inner lid 4 and the condensation tray 5. .

  At this time, when the porridge is cooked and the steam flow passage 5j is blocked by a beating or the like, or the flow of steam is deteriorated, if the pressure in the inner pot 3 further increases, the seal packing 5d The water reservoir 5e is deformed in the direction in which the pressure escapes, and its tip is separated from the lower surface of the inner lid 4. From the gap, the steam in the inner pot 3 becomes a gap 6, as shown in FIG. It flows to the passage 7 side.

  Further, as shown in FIG. 2, the steam is released to the outside through the inner lid steam passage 7, the restricting means 9, and the outer lid steam passage 8 when the restriction means 9 is opened. Since the opening area of the steam flow passage 5j of the dew receiving tray 5 is larger than that of the cover steam passage 7, the pressure in the gap between the inner pan 3 and the dew receiving tray 5 and the inner lid 4 is substantially equal. The gap 6 is filled with steam.

  In addition, since the steam flow passage 5j of the dew condensation tray 5 is located at a position that does not face the inner lid steam passage 7, steam does not go straight out of the inner lid steam passage 7, and the dew condensation tray 5 and the inner lid 4 The gap 6 is filled with steam. The full steam is condensed on the opposite surface of the dew receiving tray 5 of the inner lid 4, which has a lower temperature than the dew receiving tray 5, and is hard to be warmed.

  Since the inner lid 4 is not easily warmed and the lid heating means 10 is not heated, the steam that has touched the inner lid 4 is dissipated, and the inner lid 4 is continuously condensed to form water droplets. Accumulate on top.

  Eventually, when the steaming is started, the lid heating means 10 is energized to heat the inner lid 4, and the water droplets dripped from the lower surface of the inner lid 4 and accumulated in the dew receiving tray 5 are heated to become steam.

  As shown in FIG. 3, the steam cannot go out from the outer lid steam passage 8 due to the action (blocking) of the limiting means 9, so that the steam pressure causes the steam from the steam flow passage 5 j of the dew receiving tray 5 to enter the inner pot 3. The inside of the inner pot 3 is filled with steam. Thereby, the whole inside the inner pot 3 can be sufficiently steamed, and the rice can be finished deliciously.

  Similarly, during the heat retention, the steam generated by the lid heating means 10 does not escape to the outside air due to the action of the restriction means 9, and is uniformly supplied from the steam flow passage 5j of the dew condensation tray 5 to the entire inside pan 3. The inside of the inner pot 3 is humidified with steam to keep the rice dry while keeping it dry.

  In addition, the control of the energization state of the heating means 12 and the lid heating means 10 in the above-described steps from rice cooking to heat retention inputs a temperature sensor 13 for detecting the temperature of the inner pot 3 and temperature information from the temperature sensor 13. This is performed by the control circuit 14.

  On the other hand, when the outer lid 2 is opened to dress rice, the dew receiving tray 5 is provided with a bulging portion 5i protruding toward the inner lid 4, and a plurality of steam flow passages 5j are provided on the upper surface thereof. And the water reservoir 5e (curved portion) is formed in the seal packing 5d of the dew receiving tray 5 that has been in close contact with the lower surface of the inner lid 4 until then, the dew condensation water dripping from the pan 5a is water. It does not accumulate in the reservoir portion 5e, drop into the inner pot 3 from the steam flow passage 5j, or wet the main body 1 or the like. And after closing the outer lid | cover 2, it can use effectively for humidifying the inside of the inner pot 3 with steam with the dew condensation water which accumulated in the dew receiving tray 5, and suppressing drying of rice.

  In addition, when cleaning the condensation tray 5 after using the rice cooker, the condensation tray 5 is removed from the lower surface of the inner lid 4 and washed. The removal of the dew receiving tray 5 is the reverse of the attachment, and the upper hook 5g of the upper portion of the dew receiving tray 5 is pushed down against the urging force of the spring 5f to remove it from the upper receiving device 4c of the inner lid 4. Thereafter, the dew receiving tray 5 may be lifted somewhat upward to remove the lower hooking portion 5 h from the lower receiving tool 4 d of the inner lid 4.

  At this time, since the top surface and the bottom surface of the dish portion 5a are coated with the fluororesin, the dew condensation water does not stick to the dish portion 5a and the rice cake does not stick, and the dish portion 5a can be washed cleanly.

  As described above, according to the present embodiment, the steam generated during rice cooking is condensed on the lower surface of the inner lid 4, the condensed water is stored as water droplets in the condensation tray 5, and the water is used during steaming and heat insulation. Since it is made into steam, it is not necessary to put water into the dew condensation tray 5 before cooking, as in the prior art, and it is possible to realize a rice cooker that can be cooked and kept warm using steam with little effort.

  Further, the dew receiving tray 5 provided on the lower surface of the inner lid 4 has a substantially ring-shaped bulging portion 5i that protrudes toward the inner lid 4 at a position closer to the inner lid steam passage 7 side of the inner lid 4 from the outer peripheral side. In addition, since the plurality of steam flow passages 5j are provided along the ring shape in the bulging portion 5i, the condensed water accumulated in the dew condensation receiving tray 5 flows along the substantially ring-shaped bulging portion 5i. Since the steam that spreads over the entire surface and spouts from the steam flow passage 5j to the inner pot 3 also spouts along the ring shape, it is uniformly supplied to the entire inner pot 3, and the entire inner pot 3 is filled with steam. Can prevent the rice from drying and keep it warm.

  Further, since the steam flow passage 5j is provided in the bulging portion 5i of the dew condensation tray 5, the condensed water accumulated in the dew tray 5 can be removed from the steam flow passage 5j even if the outer lid 2 is opened to dress rice. If the outer lid 2 is closed again without dripping into the body 3 or wetting the main body 1, the inside of the inner pot 3 is humidified with steam and can be effectively used for suppressing the drying of rice.

  In addition, since the steam flow passage 5j of the dew condensation tray 5 is provided at a position that does not face the inner lid steam passage 7, steam does not go straight out of the inner lid steam passage 7, and the dew condensation tray 5 The gap 6 in the lid 4 is filled with steam, and the filled steam is converted into water droplets and accumulated on the dew receiving tray 5 and can be supplied as steam to the inner pan 3, which can be used for preventing rice from drying.

It is a longitudinal section of the whole rice cooker concerning the present invention. It is a longitudinal section showing the flow of steam in the rice cooking. It is a longitudinal cross-sectional view which shows the flow of the vapor | steam during the heat retention. It is a center longitudinal cross-sectional view of the cover part. It is a partially broken perspective view which shows the internal structure of the cover part. It is the disassembled perspective view which looked at the cover part from the upper surface. It is the disassembled perspective view which looked at the cover part from the left side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Outer lid 3 Inner pan 4 Inner lid 5 Condensation receptacle 5a Dish part 5b Standing wall 5c Frame body 5d Seal packing 5e Reservoir part 5i Swelling part 5j Steam flow path 6 Gap 7 Inner cover steam path 8 Outer cover steam Passage 9 Limiting means 10 Lid heating means

Claims (2)

  A main body, an outer lid that covers the upper surface opening of the main body, an inner pot that is detachably accommodated in the main body, an inner lid that covers the upper surface opening of the inner pot, and a substantially central portion of the inner lid An inner lid steam passage provided; an outer lid steam passage provided in the outer lid; and limiting means for restricting the passage of steam between the outer lid steam passage and the inner lid steam passage, In the rice cooker provided with a lid heating means for heating the inner lid, the outer lid is provided with a dew condensation tray on the lower surface of the inner lid so as to cover almost the entire surface of the inner lid, and the dew condensation tray is a material having a smaller heat capacity than the inner lid. The outer peripheral surface is in close contact with the lower surface of the inner lid through a seal packing, and the dew receiving tray protrudes toward the inner lid side at a position closer to the inner lid steam passage side than the outer peripheral side. It has a ring-shaped bulge, and a plurality of steam flow passages are provided along the ring in the bulge. Rice cooker according to symptoms.   2. The rice cooker according to claim 1, wherein the plurality of steam flow passages provided in the bulging portion of the dew condensation tray are provided at positions that do not face the inner lid steam passage provided in the inner lid. vessel.

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