JP3815466B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker using steam having a boiling point equal to or higher than the boiling point of water in order to improve rice cooking performance.

  In general rice cookers for home use, the pan heating means placed at the bottom of the pan to heat the rice and water in the pan is the main, and the heating means in the lid is the rice in the pan above the water. As a result of the space, auxiliary heating results. Therefore, the rice in the upper layer in the pan was insufficient in heating amount, and the rice and water in the pan could not be heated uniformly.

  Furthermore, in rice cooking, water is almost lost and fluidity of rice is lost. In the steaming process, which is the final process of rice cooking, it is delicious to continue heating until then and complete the gelatinization of rice starch. Although it is indispensable to cook rice, in this process, if the heating is continued, the rice near the bottom of the pot will be burnt, so the heating is often weakened.

  As a means for preventing insufficient gelatinization due to weakening of heating and improving rice cooking performance, an induction heating coil that is a high heat source is provided on the lid to heat rice from above the pan opening (For example, refer to Patent Document 1 and Patent Document 2).

  FIG. 3 shows the configuration of Patent Document 1. In the figure, reference numeral 1 denotes a main body case, and a bottom plate 3 having support legs 2 is fixed to the lower surface. Reference numeral 4 denotes a protective frame made of heat-resistant plastic, and a collar portion 5 provided on the upper peripheral edge is fixed to the upper surface of the main body case 1. 6 is a bottom heating induction coil mounted on the lower bottom of the protective frame 4, and 7 is a side heating induction coil installed on the lower side of the protective frame 4, which has a magnetic metal layer accommodated in the protective frame 4. The pot 8 is heated by the induction coil 6 for heating the bottom surface, and the contents of rice and water in the pot 8 are cooked. Reference numeral 9 denotes a temperature sensor mounted in a through hole provided at the center of the bottom surface of the protective frame 4, and 10 denotes a lid body having a knob 11, which is detachably mounted on the collar portion 5 at the upper end of the protective frame 4. The inner cover 12 made of heat-resistant plastic is fixed via a heat insulating material 13. Reference numeral 14 denotes an inner lid that is detachably attached to the inner cover 12 by a pin 20, and a peripheral portion thereof is placed on a collar portion of the pan 8 to cover the pan 8. Reference numeral 15 denotes a main body-side upper induction coil installed on the inner surface of the flange portion 5 of the protective frame 4 and is connected to a power source (not shown) in the main body case 1.

  Reference numeral 16 denotes a lid-side induction coil excited by the main body-side upper induction coil 15, which is attached to a portion of the lid 10 facing the main body-side induction coil 15, and the current excited by the lid-side induction coil 16 is induced. The heating plate 17 that flows to the coil 19 and is formed of a magnetic metal plate by the magnetic flux of the induction coil 19 is induction-heated, and rice cooking heating or heat insulation heating from the upper part in the pan 8 can be performed.

Since the basic configuration of Patent Document 2 is the same as that of Patent Document 1, details thereof are omitted here.
Japanese Patent No. 2988050 JP-A-6-62956

  However, in the rice cooker having the above conventional configuration, the rice in the upper layer in the pan is directly heated by the heat radiation of the induction heating coil, so that in the steaming process, the moisture of the rice is evaporated and dried. A phenomenon has occurred. Therefore, if the whole cooked rice in the pan is heated with an induction heating coil from above the pan to a temperature at which sufficient cooking performance can be ensured, the upper layer of the pan will dry and lose its taste, resulting in insufficient heating. The taste was not perfect throughout the pan.

  In addition, the higher the amount of cooked rice, the greater the amount of heating, but the greater the amount of cooked rice, the easier it is to dry because the upper rice is closer to the induction heating coil, so heating must be weakened. This caused a contradiction.

The present invention solves the above-described conventional problems, and is a detachable pan, a heating plate that covers the pan, a heating plate heating source of the heating plate, a steam generating means for generating steam, and the steam A steam passage part that is at least a part of a steam path from a generating means to a steam inlet hole for releasing steam into the pan, and in a stripping process, the steam heating part that is at least a part of the heating plate The steam generated by the steam generating means is heated by heating the steam generated by the steam generating means and throwing high temperature steam above the boiling point of water under atmospheric pressure into the pot from above the pot opening . The steam is heated by the steam heating surface on the upper surface (outer surface) of the heating plate before entering the pan, so that when hot in the pan, high-temperature steam above the boiling point (100 ° C) of water under atmospheric pressure is opened in the pan. We will supply rice from above, first, The rice is not dried because it is supplied, and secondly, when steam is supplied at a temperature of 100 ° C. or lower, water stays attached to the surface of the grain of rice. It has the energy necessary to advance the cooking, promotes gelatinization, and improves rice cooking performance. In addition, an optimum heating amount can be set regardless of the amount of cooked rice.

  As described above, according to the first to tenth aspects of the present invention, the steam that has been heated to a high temperature before the steam is put into the pan is further heated by being heated inside the same heating plate. With the effect of steam and strong convection, heat is efficiently applied to the whole rice without scorching from the rice that is not in contact with the kettle, promoting the alpha conversion of the rice, resulting in a good fire and sweetness and aroma. It can be cooked into highly sticky rice, which improves rice cooking performance.

  In addition, even if rice balls flow during cooking, stable heating is possible because the heating plate can be cared for, and the steam is further heated by maintaining the surface where the rice cake does not adhere during cleaning. It becomes possible, and rice cooking performance improves further.

  Further, the accumulation of rice cakes blocks the steam passage and prevents unsafe conditions such as steam leakage and product destruction due to steam pressure.

  In addition, while improving the rice cooking performance with high-temperature steam, it is easy to use for both the inner and outer surfaces of one heating plate.

The invention according to claim 1 is a detachable pan, a heating plate covering the pan, a heating plate heating source of the heating plate, a steam generating means for generating steam, and the steam generating means to the inside of the pan And a steam passage portion that is at least a part of a steam path to a steam inlet hole for releasing steam, and in the unevenness process, the steam is generated on an upper surface of the steam heating part that is at least a part of the heating plate. The steam generated by the means is heated , and high temperature steam that exceeds the boiling point of water under atmospheric pressure is put into the pan from above the opening of the pan, so that the temperature is raised before the steam enters the pan. Can do. Furthermore, the vapor | steam discharge | released in the pan becomes still higher temperature by being heated by the lower side (inside) of the same heating plate. Steam heated to both the upper and lower (outer and inner) surfaces of the heating plate is heated efficiently without scorching from the rice that is not in contact with the kettle due to the high temperature of the steam and strong convection of the steam. In addition to the whole rice, it is possible to improve the cooking efficiency of rice by promoting the alpha conversion of the rice and making it cooked to rice with good taste and sweetness and aroma.

  Furthermore, even if rice balls containing a rice starch solution are added to the steam heating surface during cooking, stable heating is possible by maintaining the heating plate, and the surface where the rice cake does not adhere to the surface is maintained. By being maintained, the steam heating surface can be further increased in temperature, and the rice cooking performance is further improved.

  Further, the accumulation of rice cakes blocks the steam passage and prevents unsafe conditions such as steam leakage and product destruction due to steam pressure.

  Furthermore, while improving the rice cooking performance with high-temperature steam, it is sufficient to clean both the upper and lower (outer and inner) surfaces of one heating plate, which is the same as in the past.

  The invention according to claim 2 is the invention according to claim 1, in particular, in the invention according to claim 1, the upper surface of the steam heating portion is larger than the area of the steam inlet hole, so that the steam generated by the steam generating means The steam heating surface having an area larger than the area of the steam inlet hole to be charged in can ensure a long steam contact time and is heated to a high temperature. Further, steam having a high flow rate can be discharged into the pan from the steam inlet hole having a small area. With the effect of heating rice to the back with high-speed steam with a high flow rate, it is possible to promote the alpha conversion of the whole rice and cook it into sticky rice with good sweetness, fragrance and stickiness is there.

  The invention according to claim 3 is the invention according to claim 1 or 2, particularly, wherein the upper surface of the steam heating portion is convex above the other surface of the heating plate, and the steam is on the upper side of the heating plate. By heating with the steam heating surface (outside), the temperature can be raised before the steam is put into the pan, but usually the temperature of the steam heating surface decreases with the supply of heat to the steam, and the steam Although the temperature also decreases, the convexity of the upper surface (outside) of the other surface of the heating plate makes it closer to the heating plate heating source and raises the temperature of the steam heating surface to supply heat to the steam. Can be maintained high and does not require a separate steam heating source, promotes alpha conversion of the entire rice and improves rice cooking performance.

  According to a fourth aspect of the present invention, there is provided a lid coil for inductively heating a heating plate as a heating plate heating source and a magnetic field generated by the lid coil, particularly in the invention according to any one of the first to third aspects. The ferrite is made close to the upper surface of the steam heating unit, and the steam is heated by the steam heating surface on the upper side (outside) of the heating plate, so that the steam is heated before being put into the pan. Normally, the temperature of the steam heating surface decreases with the supply of heat to the steam, and the steam temperature also decreases accordingly.However, the ferrite that permeates the magnetic field of the lid induction coil that induction-heats the heating plate is used. By making it close to the steam contact surface of the heating plate, the high frequency magnetic field is concentrated and the temperature of the steam heating surface is increased by Joule heat, and the temperature of the steam can be kept high by supplying heat to the steam. Does not require a separate steam heating source In, to facilitate α of the entire rice, it is intended to improve cooking performance.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the steam heating portion is a part of the steam passage, and the passage cross-sectional area of the steam heating portion is the steam passage portion. The cross-sectional area of the steam heating section is reduced by reducing the cross-sectional area of the steam passage section to reduce the specific heat capacity to be contacted to prevent the heat of the steam from being deprived. The steam can be heated to a high temperature by generating a turbulent state to enhance heat exchange. As a result, the initial temperature of the steam temperature is increased, the efficiency is reduced with little loss, and the effect of heating the rice with steam at a high temperature from the beginning promotes the alpha conversion of the whole rice, resulting in good sweetness and aroma. It can be cooked into highly sticky rice. Also, if the cross-sectional area of the passage through which steam passes is small, it is difficult to secure a passage when a stick is attached, and it is likely to be unsafe such as steam leakage or product destruction due to steam pressure, but the steam heating surface can be maintained Thus, the cross-sectional area of the passage can be increased.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, in particular, the steam path includes a heating plate packing that seals against the upper surface of the steam heating unit, and the heating plate is attached and detached. It can be used freely so that hot steam can be supplied to the rice before it is put into the pan. Can be stably heated, the surface having no deposits can make the steam heating surface even higher, and the rice cooking performance is improved.

  Further, the accumulation of rice cakes blocks the steam passage and prevents unsafe conditions such as steam leakage and product destruction due to steam pressure. Moreover, although it is the cooking rice by steam, the maintenance property only of the same heating plate as before is sufficient, and it can be used stably over time.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the upper surface of the steam heating part is made higher than the steam temperature and then main steam is discharged into the pan. The steam at a high temperature is supplied into the pan from the beginning, and heat can be efficiently applied to the entire rice from the beginning of the steam input, thereby improving the rice cooking performance.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, in which the steam passage portion and the steam heating portion are opposed to the lid coil, and the steam heating portion extends from the steam passage portion. The steam inlet and the steam inlet hole for sending steam to the heater are located opposite to each other with the steam heating surface of the heating plate in between, and are generated by the steam generating means and flow into the steam heating section through the steam passage section. The coming steam is further heated by the lid coil while passing, and the temperature rises. Since the steam inlet and the steam inlet hole into the pan are separated, the temperature can be further raised by contacting the steam heating surface of the heating plate. . By putting the steam at a higher temperature into the pan, the whole rice is promoted to become alpha, and can be cooked into rice with good stickiness, sweetness, aroma and stickiness.

  The invention according to claim 9 is the invention according to any one of claims 1 to 8, particularly comprising a seal portion that seals a connection portion between the steam generating means and the steam passage portion, and the seal portion is provided at the tip. A seal shape holding part is provided, which prevents steam from leaking from the connecting part between the steam generating means and the steam passage part by contact with steam, and throwing steam into the pan more reliably. By doing so, the reliability can be improved.

  The invention according to claim 10 is the invention according to any one of claims 1 to 9, in particular, by providing a rib for preventing the seal portion from being fixed outside the seal portion, whereby the seal portion is crushed and fixed. The steam generation means and the steam passage section can be prevented from being sealed, the steam is prevented from leaking, and the steam is more reliably put into the pan to improve the reliability. It is something that can be done.

  Embodiments of the present invention will be described below with reference to the drawings.

  An embodiment of the present invention will be described below with reference to FIG. In the figure, 31 is a substantially cylindrical body having an upper surface opened. An upper frame 32 is attached to the opening of the body 31. Inside the body 31, an upper frame 32 and a coil base 33 form a pan 34 storage portion. The coil base 33 is formed in a bottomed cylindrical shape, and the upper end portion of the coil base 33 is fixed to the upper frame 32. The coil base 33 is provided with a bottom induction coil 35 for induction heating of the pot 34, and the pot 34 is induction heated. In addition, a bottom sensor 36 for detecting the temperature of the pan 34 is energized by a sensor spring (not shown) on the bottom of the pan 34, and the cooking temperature in the pan 34 is optimally detected by detecting the temperature of the cooked rice and the temperature of the pot. The temperature is controlled so as to be in a proper temperature state.

  Reference numeral 37 denotes an outer lid made of synthetic resin. The outer lid 37 is rotatably supported via a pin on a hinge member 32a formed integrally with the rear portion of the upper frame 32.

  Reference numeral 38 denotes a pan packing 39 attached / detachable heating plate, which is attached to an outer lid cover 40 constituting the lower surface of the outer lid 37. The outer lid cover 40 includes a lid induction coil 41 that is a heating plate heating source and induction heating the heating plate 38, a ferrite 49 that transmits a high-frequency magnetic field, and a heating plate sensor 50 that is a temperature detection unit of the heating plate 38. Is installed. The heating amount of the heating plate 38 is determined by the magnitude of the current supplied to the lid induction coil 41, the number of turns of the lid induction coil 41, etc., as in the heating principle of the electromagnetic cooker. The effect of the plate requires as much heating power as possible in order to exert the oven effect from the top of the rice. Further, temperature information and temperature control of the heating plate 38 can be performed by the heating plate sensor 50.

  The upper frame 32 is provided with a boiler 42 as steam generating means, and a housing portion of the boiler 42 is formed by a boiler cover 43 attached to the upper frame 32. A boiler induction coil 44 for inductively heating the boiler 42 is wound around the boiler cover 43, and the boiler 42 is heated to generate steam. A steam path 45 for supplying the generated steam to the pan 34 is provided above the boiler 42, and the steam path 45 includes a steam passage portion 51 and a steam heating portion 52. In the steam passage 51, the steam path 45 and the boiler 42 are sealed by a boiler packing 46 serving as a seal part installed in the steam path 45. The boiler packing 46 is provided with a seal shape holding portion 55 over the entire periphery of the tip. Further, a rib 56 is provided outside the boiler packing 46, and the rib 56 is provided at a position where the boiler packing 46 contacts when the boiler packing 46 is crushed.

  Further, in the steam heating unit 52, the steam heating surface 53 that is located on the outer surface of the heating plate 38 and protrudes outward from the other surface and close to the lid induction coil 41 is brought close to the steam heating surface 53 and the lid induction coil 41. The steam is heated by the concentration of the high-frequency magnetic field of the ferrite provided outside. The heating section passage cross-sectional area of the passage section for heating the steam is larger than the passage section passage cross-sectional area of the steam passage section 51, and the detachable heating plate 38 is connected to the heating plate packing 48 constituting the steam heating surface 53. The steam path 45 is sealed. With these configurations, the temperature of the steam heating surface 53 of the heating plate 38 is detected by the heating sensor 50 and is made higher than the steam temperature, and then steam is generated by the boiler 42. The steam passes through the steam passage 51, is heated by the steam heating surface 53 of the steam heating section 52, and becomes high temperature steam before being put into the pan. The high-temperature steam is supplied into the pot 34 from a steam inlet hole 47 provided on the heating plate 38 and having a smaller area than the steam heating surface 53.

  As described above, the heating from the heating plate 38 needs to be heated with a strong heating power in order to exert the oven effect. However, in the steaming process of rice cooking, the moisture in the pan 34 has already disappeared. In addition, the strong heating by the heating plate 38 causes the rice to be dried, and the heating has a limit. Here, if the steam is generated when the heating plate 38 is heated and becomes higher than the steam temperature during the unevenness process, it is effective to prevent the rice from drying. The steam is heated by the steam heating surface 53, which is the outer surface of the heating plate 38, and becomes hot, and the steam that has become hot before being put into the pan 34 is put into the pan 34.

  Further, the steam becomes a higher temperature due to the heat of the inner surface of the heating plate 38. That is, the convection due to the steam flow that has become high temperature by heating the steam on both the outer and inner surfaces of the heating plate 38 contacts the whole rice without scorching from the top of the rice that is not in contact with the kettle. Thus, not only the high-temperature steam that has been charged adheres to the surface of the rice but also the high-temperature steam at 100 ° C. or higher comes into contact with the rice, so that gelatinization of the rice is promoted.

  In addition, heating only the heating plate 38 only heats the rice surface, but the heated steam can affect not only the surface of the rice but also the rice middle layer by convection. . In this way, due to strong convection of high-temperature steam, heat can be efficiently added to the whole rice, and it can be cooked into rice that has good sweetness, aroma and stickiness by promoting alpha conversion of rice, Rice cooking performance is improved.

  Furthermore, even if the rice heating solution 53 containing rice starch flows into the steam heating surface 53 during rice cooking, the heating plate 38 can be maintained, so that stable heating is possible, and there is no rice sticking in the cleaning. By maintaining the surface, the steam heating surface 53 can be further increased in temperature, and the rice cooking performance is further improved.

  Further, the accumulation of rice cakes blocks the steam passage and prevents unsafe conditions such as steam leakage and product destruction due to steam pressure.

  Furthermore, while improving the rice cooking performance with high-temperature steam, it is sufficient to clean both the outer and inner surfaces of one heating plate 38, which is the same as conventional.

  In addition, the heating plate 38 is heated by self-heating due to electromagnetic induction heating of the lid induction coil 41. However, the heating plate 38 can be heated by other than the electromagnetic induction heating method. Can do.

  Moreover, although the heating method of the boiler 42 which is a steam generation means has been described as an electromagnetic induction heating method using the boiler induction coil 44 in this configuration, the same effect can be obtained in another heating method.

  Further, in this configuration, the steam inlet hole 47 is provided in the heating plate, but the heating plate 38 is provided with a steam outlet hole 49 for discharging steam out of the main body, and the steam inlet hole 47 and the steam outlet hole 49 are combined. With the configuration described above, steam may be introduced into the pan.

  Further, the steam supply hole 47 is provided in the heating plate 38 to supply the steam, but the steam input hole 47 is not required to be provided in the heating plate 38, and is a steam input hole that can supply steam into the pan 34. If there is, it may be provided anywhere.

  The steam contact surface 53 on the outer surface of the heating plate 38 that is the steam path 45 has an area larger than the area of the steam inlet hole 47 that discharges steam into the pan 34, so that the steam generated by the steam generating means The steam heating surface 53 having an area larger than the area of the steam inlet hole 47 introduced into the pan 34 can ensure a long steam contact time and is heated to a high temperature.

  Further, steam having a high flow velocity can be discharged into the pot 34 from the steam inlet hole 47 having a small area. With the effect of heating rice to the back with high-speed steam with a high flow rate, it is possible to promote the alpha conversion of the whole rice and cook it into sticky rice with good sweetness, fragrance and stickiness is there.

  The steam heating surface 53 of the heating plate 38 that is the steam path 45 is convex outward from the other surfaces of the heating plate 38, and the steam is heated by the steam heating surface 53 outside the heating plate 38, Although the temperature can be raised before the steam is introduced into the pan 34, the temperature of the steam heating surface 53 is usually lowered by the supply of heat to the steam, and the steam temperature is lowered accordingly. By projecting outward from the surface, the temperature of the steam heating surface 53 is increased by being close to the lid induction coil 41 and heat can be supplied to the steam to keep the steam temperature high. It is not necessary and promotes the pre-gelation of the whole rice to improve the rice cooking performance.

  The steam is heated by the steam heating surface 53 outside the heating plate 38, so that the temperature can be raised before the steam is put into the pan 34. Usually, the temperature of the steam heating surface 53 is supplied by supplying heat to the steam. Accordingly, the temperature of the steam also decreases, but the ferrite 49 that transmits the magnetic field generated by the lid induction coil 41 that induction-heats the heating plate 38 passes through the steam contact surface 53 of the heating plate 38 that is the steam path 45. It is possible to concentrate the high-frequency magnetic field and raise the temperature of the steam heating surface 53 with Joule heat, supply heat to the steam, and keep the steam temperature high. No steam heating source is required, so that the whole rice is promoted to improve the rice cooking performance.

  The steam path 45 includes a steam passage section 51 on the steam generating means side and a steam heating section 52 on the heating plate 38 side, and a heating section passage cross-sectional area of the steam heating section 52 configured by the steam heating surface 53 of the heating plate 38. Is larger than the passage cross-sectional area of the steam passage portion. The steam passage 51 has a small passage cross-sectional area to reduce the specific heat capacity to be contacted to prevent the heat of the steam from being deprived, and the heating section passage cross-sectional area of the steam heating surface 53 is widened to make a turbulent flow. The steam can be heated to a high temperature by generating a state to enhance heat exchange. As a result, the initial temperature of the steam temperature is increased, the efficiency is reduced with little loss, and the effect of heating the rice with steam at a high temperature from the beginning promotes the alpha conversion of the whole rice, resulting in good sweetness and aroma. It can be cooked into highly sticky rice.

  In addition, it is difficult to secure a passage when a rice ball or the like adheres, and it is easy to be unsafe such as steam leakage or destruction of the product due to steam pressure. However, the steam heating surface 53 can be maintained, thereby widening the sectional area of the heating portion passage. It becomes possible.

  The steam path 45 can be detachably sealed by the heating plate packing 48 that contacts and seals the steam heating surface 53 of the heating plate 38, so that even if a bowl flows in, only the heating plate 38 is removed. By being able to wash, it is possible to maintain a surface without deposits, and thus stable heating is possible. With the surface without deposits, the steam heating surface 53 can be further heated, and rice cooking performance is improved. Further, the accumulation of rice cakes blocks the steam passage and prevents unsafe conditions such as steam leakage and product destruction due to steam pressure. Moreover, although it is the cooking rice by steam, the maintenance property only of the same heating plate as before is sufficient, and it can be used stably over time.

  By releasing main steam into the pan 34 after the steam heating surface 53 of the heating plate 38 is higher than the steam temperature, steam having a high temperature is supplied into the pan from the beginning of the charging, and it is efficiently performed from the beginning of steam charging. Heat can be applied to the whole rice, and rice cooking performance is improved.

  The steam path 45 is located at a position facing the lid induction coil 41 that induction-heats the heating plate 38 that is a heating plate heating source in both the steam passage portion 51 and the steam heating portion 52, and discharges steam into the pan. The steam introduction hole 47 is located at a location separating the steam heating surface 53 of the heating plate 38 from the steam inlet 61 of the steam passage portion 52.

  The steam generated in the boiler 42 as steam generating means and passing through the steam passage portion 51 and flowing into the steam heating portion 52 is further heated by the lid induction coil 41 during the passage to rise in temperature, and the steam inlet 61 Since the steam injection hole 47 into the pan is separated, the temperature can be further increased by contacting the steam heating surface 53 of the heating plate 38. Steam that has become hotter by the operation as described above is put into the pan 34 to promote the alpha conversion of the whole rice, and cooked into sticky rice with good sweetness, aroma and stickiness. It is something that can be done.

  Furthermore, by providing the boiler packing 46 with the seal shape holding portion 55, the deformation of the boiler packing 46 can be reduced. Since the steam passage 51 is detachable for cleaning, there is a possibility that the boiler packing 46 may be deformed when the boiler packing 46 is pushed or immersed in hot water for a long time during cleaning. is there. When the boiler packing 46 is deformed, the steam leaks from the connection portion between the boiler 42 and the steam passage 51, and the steam thrown into the pan 34 is reduced and the taste is lowered. When boiler packing 46 is not circular, it becomes easy to change especially.

  As described above, by providing the boiler packing 46 with the seal shape holding portion 55 and reducing deformation of the boiler packing 46, it is possible to provide a highly reliable rice cooker with reduced steam leakage.

  Further, by providing the rib 56 on the outside of the boiler packing 46, when the “<”-shaped boiler packing 46 is crushed, the center point of the “<” shape hits the rib 56, and the boiler packing 46 is further crushed. It becomes difficult. For this reason, it is possible to reduce sticking in a crushed state due to adhesion of rice or the like on glue inside the boiler packing 46. When the boiler packing 46 is fixed in a crushed state, a gap is generated between the boiler 42 and the steam passage 51, and the steam generated in the boiler 42 leaks from the gap, and the steam charged into the pan 34 is reduced. , The taste will be reduced.

  As described above, it is possible to provide a highly reliable rice cooker in which the boiler packing 46 is crushed and fixed and the connection between the boiler 42 and the steam passage 51 cannot be sealed, and steam leakage is reduced. Can do.

  As described above, the rice cooker according to the present invention efficiently adds heat to the whole rice without scorching from the rice not in contact with the kettle due to the effect of the high temperature of steam and strong convection of steam. Can be cooked into sticky rice with good sweetness, fragrance and stickiness by promoting the alpha conversion of rice, making it possible to improve rice cooking performance, so it can be used not only for home use but also for commercial rice cookers It can also be applied to.

Sectional drawing which shows the rice cooker in Example 1 of this invention. Detailed sectional drawing which shows the rice cooker in Example 2 of this invention. Cross section of conventional rice cooker

Explanation of symbols

34 pan 38 heating plate 41 lid heating means (lid induction coil)
42 Steam generating means (boiler)
45 Steam path 46 Seal (boiler packing)
47 Steam inlet hole 48 Heating plate packing 49 Ferrite 51 Steam passage part 52 Steam heating part 53 Steam heating surface 55 Seal shape holding part 56 Rib 61 Steam inlet

Claims (10)

A detachable pan, a heating plate covering the pan, a heating plate heating source of the heating plate, a steam generating means for generating steam, and a steam inlet hole for releasing steam from the steam generating means into the pan and a steam passage is at least part of the vapor path to the at steaming step, the over surface of the steam heating unit is at least part of the heating plate to heat the steam the steam generating means generates A rice cooker that puts high-temperature steam that is equal to or higher than the boiling point of water under atmospheric pressure into the pan from above the pan opening . The rice cooker according to claim 1, wherein the upper surface of the steam heating unit is larger than the area of the steam inlet hole. The rice cooker according to claim 1 or 2, wherein an upper surface of the steam heating unit is convex upward from the other surface of the heating plate. The lid induction coil which induction-heats the heating plate which is a heating plate heating source, and the ferrite which permeate | transmits the magnetic field which the said lid induction coil generate | occur | produced, The said ferrite was made to adjoin to the upper surface of a vapor | steam heating part. The rice cooker of any one of. The steam cooker according to any one of claims 1 to 4, wherein the steam heating part is a part of a steam passage, and a passage sectional area of the steam heating part is wider than a passage sectional area of the steam passage part. The rice cooker according to any one of claims 1 to 5, wherein the steam path includes a heating plate packing that seals against the upper surface of the steam heating unit, and the heating plate is detachable. The rice cooker according to any one of claims 1 to 6, wherein main steam is discharged into the pan after the upper surface of the steam heating unit is made higher than the steam temperature. A position where the steam passage portion and the steam heating portion face the lid coil, and the steam inlet and the steam inlet hole for sending steam from the steam passage portion to the steam heating portion face each other across the steam heating surface of the heating plate The rice cooker according to any one of claims 1 to 7. The rice cooker according to any one of claims 1 to 8, further comprising a seal portion that seals a connection portion between the steam generation means and the steam passage portion, wherein the seal portion is provided with a seal shape holding portion at a tip. The rice cooker of any one of Claims 1-9 provided with the rib which prevents sticking of a seal part on the outer side of a seal part.

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