JP2019034085A - rice cooker - Google Patents

Abstract

An object of the present invention is to prevent dew adhering to the rice from dripping when the outer lid is opened slowly. A main body, an outer lid that covers an upper surface opening of the main body and opens and closes with a hinge shaft as a fulcrum. An inner hook 4 housed in the main body 1, an inner lid 3 that covers the upper surface opening of the inner hook 4 and is attached to the outer lid 2, and a condensation tray 21 that is attached to the lower surface of the inner lid 3 and accumulates condensed water; The dew receiving tray 21 is integrally formed of a material having a larger heat capacity and higher heat resistance than an aluminum material. When the outer lid 2 is opened, the dew receiving tray 21 collects condensed water adhering to the surface of the dew receiving tray 21. An opening 22 is provided, and the surface 21 g of the dew condensation tray 21 is subjected to a roughing process to make the dew condensation water easily wet the dew condensation tray 21. [Selection] Figure 9

Description

  The present invention relates to a rice cooker that collects dew on a lid.

  Conventionally, many rice cookers that send steam into the inner pot have been proposed in order to reduce drying of the rice during the heat insulation.

  As such a rice cooker, the dew receiving tray shown in Patent Document 1 collects the aluminum pan coated with a fluororesin that collects condensed dew water and the dew dripping on the outer lid rotating shaft side of the pan. When the rice is humidified, the lid heater is energized to heat the dew condensation water, and the steam flows from the dew collecting passage and the dew collecting hole to the inner pot. To supply.

JP2011-234996A

  In the above-described conventional technology, the configuration of the dew receiving tray of Patent Document 1 is a combination of parts made of an aluminum pan and a resin dew collecting hole.

  For this reason, since the dish portion is made of aluminum having a small heat capacity and a small heat resistance, the temperature of the inner lid at the time of rice cooking also rises early, so that a large amount of condensed water cannot be stored.

  Also, when opening the lid, it will not open at once, and if it opens slowly with a long tilting time so as not to cause an open impact, dew cannot be collected from the lid to the pocket, and condensation will not occur. Water falls on the rice while the lid is open.

  An object of the present invention is to prevent condensed water from falling on rice when the lid is opened.

  The present invention has been made to solve the above-mentioned problems, and includes a main body, an outer lid that covers an upper surface opening of the main body and opens and closes with a hinge shaft as a fulcrum, an inner hook accommodated in the main body, An inner lid that covers the top opening of the hook and is attached to the outer lid; and a condensation tray that is attached to the lower surface of the inner lid and collects condensed water. The condensation tray has a larger heat capacity than the aluminum material and has a heat resistance. When the outer lid is opened, a recovery port is provided to guide the condensed water adhering to the surface of the condensation tray when the outer lid is opened, and the condensed water is condensed on the surface of the condensation tray. It has been subjected to roughening to make it easier to get wet.

  According to the present invention, it is possible to prevent the condensed water from falling on the rice when the lid is opened.

1 is an overall perspective view of a rice cooker according to the present invention. It is a schematic perspective view of the state where the outer lid of the rice cooker is open. It is side surface sectional drawing of the rice cooker. It is a perspective view of the state which removed the inner lid from the outer lid in the state where the condensation saucer of the rice cooker was attached. It is AA sectional drawing of FIG. It is a perspective view of the inner surface side of the dew condensation tray of the state removed from the inner lid of the rice cooker. Explanatory drawing about the wetness of the liquid. Explanatory drawing of the contact angle of the flat surface of a liquid, and a rough surface. The perspective view which gives a rough surface process to the surface of the dew condensation tray 22 of FIG.

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

  FIG. 1 is an overall perspective view of a rice cooker according to the present invention, and FIG. 2 is a schematic perspective view of the rice cooker with its outer lid open.

  In the figure, 1 is the main body of the rice cooker. An inner hook 4 is detachably inserted into the main body 1. On the upper surface of the main body 1, an outer lid 2 having an inner lid 3 that covers the upper surface openings of the main body 1 and the inner hook 4 is provided so as to be freely opened and closed.

  A packing 34 that is in close contact with the upper end of the inner hook 4 is provided at the lower peripheral edge of the inner lid 3, and the upper opening of the inner hook 4 is closed and sealed.

  An operation unit 31 for performing various menu operations is provided on the upper surface of the outer lid 2 of the main body 1. In addition, the upper surface of the outer lid 2 has a display unit 32 composed of a liquid crystal display for displaying time display, rice cooking progress, setting contents of various menus, and the like. And various menus and timer cooking settings.

  The main body 1 is provided with a handle 33 that can be rotated back and forth, so that the main body 1 can be carried freely.

  3 is a side cross-sectional view of the rice cooker, FIG. 4 is a perspective view of the rice cooker with the dew receiving tray attached to the inner lid removed from the outer lid, and FIG. 5 is an AA cross-sectional view of FIG. FIG. 3 is a perspective view of the inner surface side of the dew condensation pan in a state removed from the inner lid of the rice cooker. FIG. 9 is a perspective view in which the surface of the condensation tray 22 is roughened.

  Main heating means 14 is provided on the lower surface of the inner hook 4, and these are constituted by heating coils, whereby the entire surface of the inner hook 4 is uniformly induction heated. A lid heating means 16 is provided on the lower surface of the outer lid 2 so as to heat the inner lid 3 made of a stainless steel plate attached to the outer lid 2 evenly. The inner lid 3 covers the upper opening of the inner hook 4 and is provided so as to be kept airtight by contact between a packing 34 provided around the inner lid 3 and the upper end surface of the inner hook 4.

  The inner lid 3 includes a pressure regulating valve 13b having an inner lid steam passage 11 for discharging steam from the inner pot 4 to the outside, and a pressure regulating means 13 comprising a pressure regulating ball 13a for closing the inner lid steam passage 11. The steam that is provided and passes through the pressure adjusting means 13 is discharged to the outside from the exhaust port 8 through the outer lid steam passage 12 provided in the outer lid 2.

  When the vapor pressure inside the inner pot 4 rises above a predetermined pressure, the pressure adjusting ball 13a is lifted and the pressure is released, and is discharged from the outer lid vapor passage 12 to the outside of the main body 1 through the exhaust port 8. When the pressure becomes lower than the predetermined pressure, the pressure adjusting ball 13a again closes the inner lid steam passage 11 and the steam pressure increases. By repeating this, the pressure in the inner hook 4 and the inner lid 3 is adjusted to a predetermined pressure.

  Further, the pressure adjusting ball 13a is arbitrarily moved by an opening means 17 comprising a solenoid that operates in response to a signal from the control unit 20, and the pressure of the inner hook 4 can be freely adjusted.

  A temperature sensor 19 is provided at the lower part of the main body 1 so as to contact the outer bottom of the inner hook 4, and temperature information of the bottom of the inner hook 4 detected by the temperature sensor 19 is input to the control unit 20.

  The control unit 20 controls the operation of the main heating means 14 during rice cooking, and controls the lid heating means 16 during heat retention based on the temperature information of the inner pot 4 from the temperature sensor 19.

  A condensation tray 21 is detachably attached to the lower surface of the inner lid 3, and the condensation tray 21 is made of a resin (for example, SPS resin (syndiotactic polystyrene resin)) having a higher heat capacity and higher thermal resistance than an aluminum material. Is attached so as to cover almost the entire lower surface, thereby forming a space 24 between the inner lid 3 and the condensation tray 21. Further, the surface 21 g of the dew receiving tray 21 is buried below (inside) the upper end surface of the inner hook 4.

  The lid heating means 16 provided on the outer lid 2 heats the inner lid 3 adjacent to the outer lid 2 and also heats the dew condensation tray 21 via the inner lid 3.

  The dew condensation receiving tray 21 includes a tray portion 21a, a rising wall 21b provided on the outer periphery of the tray portion 21a, and a seal packing 21c fitted on the inner peripheral wall surface of the rising wall 21b, and the seal packing 21c. The tip portion protruding from the inner peripheral wall surface of the rising wall 21b is bent in the central direction of the dish portion 21a and is brought into close contact with the lower surface of the inner lid 3. The bent portion of the seal packing 21c is shaped so as to receive dew condensation water dripping from the inner lid 3 and the dish portion 21a when the outer lid 2 is opened.

  In addition, a plurality of bulged portions 21f having a substantially hemispherical shape and projecting toward the inner lid 3 are provided in the plate portion 21a of the dew condensation tray 21, and steam from the inside of the inner pot 4 flows into the apex of the bulged portion 21f. A steam hole 21e is provided.

  The hole position of the steam hole 21 e is provided at a position that does not face the inner lid steam passage 11 provided in the inner lid 3. This is configured such that the vapor flowing from the vapor hole 21 e is applied to the entire surface of the inner lid 3, and condensation is attached to the surface of the inner lid 3.

  Further, when the outer lid 2 is opened and the dew receiving tray 21 stands upright, dew adhering to the surface 21g of the dew receiving tray 21 (the surface on the inner hook 4 side) flows on the surface 21g of the dew receiving tray 21 so that the outer lid 2 can be opened and closed. It is led from the recovery port 22 provided at a position close to the hinge shaft 2a to be supported to the water reservoir 21d in the space 24.

  When the outer lid 2 is opened when the collection port 22 is ready to serve rice, the space 24 moves toward the collection port 22 so that the dew adhering to the surface 21 g on the inner pot 4 side of the dew receiving tray 21 can be easily guided into the space 24. An inclined portion 22a inclined inward and a water reservoir portion 21d for collecting condensed water from the recovery port 22 to the hinge shaft 2a side are provided. A rising wall 21 b is provided around the collection port 22 so as to prevent the condensed water accumulated in the space 24 from spilling into the inner pot 4. Similar to the steam hole 12e, the recovery port 22 is also provided at a position not facing the inner lid steam passage 11.

  When the outer lid 2 is closed, the condensed water collected in the water reservoir 21d spreads thinly over the entire side of the collection port 22 on both sides of the recovery port 22, and is efficiently heated by the lid heating means 16.

  Here, when the outer lid 2 is opened before, the dew is tilted when the outer lid 2 is slowly opened so as to increase the time during which the outer lid 2 is tilted so as not to cause an impact when the outer lid 2 is opened without opening at once. It did not flow along the part 22a, but fell before it and was not collected in the collection port 22, but fell into the rice.

  Since the collection port and the tray part of the condensation tray are integrally formed of resin, there are no joints or steps, and the dew adhering to the surface of the condensation tray flows smoothly to the collection port.

  In addition, the surface of the condensate pan is subjected to a grid-like coarse treatment, reducing the surface tension with the dew adhering to the surface of the condensate pan, improving water repellency, and making it easier for the dew to flow to the collection port. Yes. For this reason, there is no worry that water drops spill on the rice inside the inner pot or get over the bank of the dew receiving tray and spill on the floor.

  Therefore, in the present invention, a roughening process (FIG. 9) is applied to the surface 21g of the dew receiving tray 21 to which the dew adheres. By applying the coarse treatment, the surface 21g of the dew receiving tray 21 is attached by increasing the surface tension with the dew adhering to the surface 21g, and the surface is roughened so that the dew adheres to the surface and the dew is on the surface 21g. By slowing the flow from the water, when the outer lid 2 is opened, the dew condensation water adhering to the surface repels water so that the dew does not fall on the rice and easily flows to the recovery port 22, or Evaporate.

  FIG. 9 is a perspective view of a ball shape 40, a filed shape 41, and a mesh shape 42, which are examples of the coarse treatment applied to the surface 21 g of each dew receiving tray 21.

  Here, surface tension or wetting will be described with reference to FIGS. When water is in contact with an object, in general, when expressing wetness, examples include good wetting (poor water repellent) and poor wetness (water repellent good, so-called water repellency). .

  There is what quantitatively represents this wet state. As shown in FIG. 7, it is possible to confirm the wetness of the object by using an angle “contact angle” 37 between the solid surface 35 of the object and the liquid 36 swelled in a spherical shape. As shown in FIG. 7, it can be said that when the water droplet is dropped on the object, the water droplet rises small, and the larger the contact angle 37 with the solid surface 35 is, the harder the wet object is.

  Moreover, it can be said that it is an object which gets wet easily, so that a water droplet soaks and the contact angle 37 with the solid surface 35 is small. When the solid surface 35 is easily wetted with water, the solid is said to be hydrophilic. Conversely, when the solid surface 35 repels water, it is said to be water repellent. This is mainly determined by the properties of the material itself.

  The hydrophilic / water-repellent classification is relative, but is classified according to whether the contact angle 37 is 90 ° or less or 90 ° or more.

  The wettability is determined by the surface tension of the liquid and the solid, that is, the contact angle 37 and the contact area between the liquid and the solid, and as shown in FIG. Aqueous is less wettable.

  Actually, the wettability, which is the wettability of the liquid to the solid, is proportional to the roughness of the surface, and the characteristic can be expressed by the above-described FIG. 8 and the following “Wenzel equation”.

(Equation 1)
cosθw = r cosθ
θw is the contact angle 39 with the rough surface, θ is the contact angle 38 with the flat surface, and r is the area ratio of the rough surface to the flat surface. The rougher the surface, the larger the area ratio r. Roughly wet surfaces are more likely to get wet. Θ <90 ° θ> θw.

  In the ball shape 40 of Fig.9 (a), the surface 21g of the dew condensation tray 21 is processed into the convex ball shape like the surface portion of the chamozi attached to the jar rice cooker. The size of the ball shape of the convex portion is narrower and higher than the diameter of the ball shape of the convex portion of the conventional chamomile.

  By applying this convex ball shape, surface tension acts between the water and the ball shape, and by lowering the height of the ball shape, water drops between the water and the ball shape spread over a wide area and the surface tension is strong. Make it easy to get wet with water by working. As a result, water becomes difficult to repel water. By making it easy to get wet and making it difficult to drop and flow, water can be put into the recovery port 22 or evaporated before it.

In the filed (coarse-grained) shape 41 in FIG. 9B, the surface 21g of the dew receiving tray 21 is roughened more than the surface wrinkle for preventing fingerprint adhesion of the resin molded product.
This is similar to the above-described ball shape processing 40, and by applying this file to the surface, the surface of the hydrophilic dew receiving tray that gets wet with water originally becomes rough. By applying this file to the surface, the rougher the surface according to the Wenzel equation, the larger the surface area, the more likely it is to get wet. Flowing.

  If the surface is uniform but geometrically nonuniform and rough, the “Wenzel equation” holds. cosθw = r cosθ (r = actual surface area / apparent surface area ≧ 1 If a surface that is easily wetted is roughened, it becomes more likely to be wetted θ <90 ° θ> θw).

  In the mesh shape 42 of FIG. 9C, the surface 21 g of the dew receiving tray 21 is processed to have an uneven step shape on the mesh. This mesh shape is the above-mentioned unevenness specification, and the hydrophilic one according to the Wenzel equation is easier to wet as it is rougher. Therefore, the surface area increases due to the level difference due to the unevenness of the mesh, and it becomes easier to wet. In addition, since the mesh shape is an uneven mesh shape, when water flows, the path through which the unevenness flows becomes longer, and since the water flows into the recesses and recesses, the surface area becomes larger, making it easy to get wet and difficult to repel water. When the lid is opened, it adheres to the dew receiving tray, and then enters the recovery port 22 or the flow slows down, so that it evaporates during the flow.

  A present Example becomes the above structure, Next, the operation | movement is demonstrated about a rice cooking process.

  First, when the user puts an appropriate amount of rice and water into the inner pot 4 and closes the outer lid 2, the inner lid 3 closes the upper portion of the inner pot 4, and a space sealed by the packing 34 is formed. At this time, this space also includes a space 24 constituted by the inner lid 3 and the dew receiving tray 21.

  When the user sets rice cooking with the operation unit 31, the control unit 20 starts rice cooking.

  The controller 20 controls the energization of the main heating means 14 to heat the inner pot 4 so that rice cooking proceeds. At this time, the lid heating means 16 is not energized.

  The control unit 20 operates the opening means 17, and the pressure adjusting ball 13a closes the pressure adjusting valve 13b. The pressure regulating valve 13b opens to adjust the pressure when the inside of the inner pot 4 boils and the steam pressure increases.

  Steam (low temperature steam) is generated from the time when the inside of the inner pot 4 exceeds 60 ° C., and condensation occurs due to the temperature difference by touching the inner peripheral surface of the inner pot 4. Due to condensation, the surface of the dew receiving tray 21 facing the inner pot 4 receives heat, so the temperature of the dew receiving tray 21 rises in a state close to the temperature of hot water inside the inner pot 4.

  At this time, the inner lid 3 is almost entirely covered with the dew condensation tray 21 and is not touched by steam (low-temperature steam), and the dew condensation plate 21 is made of SPS resin. However, the heat conduction from the dew condensation tray 21 is small, and the temperature is lower than that of the dew condensation tray 21.

  Eventually, when the inside of the inner pot 4 boils, steam (about 100 ° C.) is generated to increase the pressure, and the space 24 constituted by the inner lid 3 and the dew receiving tray 21 from the steam hole 21 e and the recovery port 22 of the dew receiving tray 21. Steam flows into.

  The steam generated from the inside of the inner pot 4 is discharged from the outer lid steam passage 12 through the exhaust port 8 to the outside of the main body 1, and the steam inside the space 24 is condensed on the inner lid 3, and the dripping water droplets are condensed into a dew receiving tray. It falls on the upper surface of 21.

  At this time, since the inner lid 3 is almost entirely covered with the condensation tray 21 and is in contact with the seal packing 21c of the condensation tray 21, the heat of the condensation tray 21 is not transmitted to the inner lid 3, Since a temperature difference occurs, the steam flowing in from the steam hole 21 e and the recovery port 22 is condensed on the surface of the inner lid 3 and falls to the tray portion 21 a of the condensation tray 21. In addition, since the inner lid 3 is not easily warmed and the lid heating means 16 is not heated, the steam touching the inner lid 3 is dissipated and continuously dewed to the inner lid 3 to form water droplets. It accumulates in.

  Further, the steam hole 21e in the tray portion 21a of the dew receiving tray 21 is located at a position not facing the inner lid steam passage 11 and is at the apex of the bulging portion 21f that protrudes toward the inner lid 3 in a substantially hemispherical shape. The water droplets do not fall into the inner pot 4 and accumulate on the plate portion 21e of the dew receiving tray 21.

  In the present invention, the SPS resin is used for the condensation tray 21. Since the SPS resin has a higher thermal resistance than the conventional aluminum plate material, the dew receiving tray 21 that receives the heat generated from the inside of the inner pot 4 has a smaller heat transfer to the inner lid 3 side. As a result, the temperature difference between the inner lid 3 and the dew condensation tray 21 can be maintained large and long, and it becomes possible to condense the steam for a long time, resulting in a large amount of dew condensation water compared to the aluminum material used in the prior art.

  When rice cooking further proceeds and the water in the inner pot 4 runs out, the process proceeds to the steaming process. Sufficient steam is needed to steam well in the steaming process. The control unit 20 energizes the lid heating means 16 to heat the inner lid 3 facing the inner hook 4. Due to the heat of the inner lid 3, the dew condensation water that spreads and accumulates on the plate portion 21 e of the dew condensation tray 21 is efficiently heated and vaporized, and is discharged from the vapor hole 12 e and the recovery port 22 to the inside of the inner pot 4. As a result, the rice can be steamed with sufficient steam to finish the rice deliciously.

  When the steaming process is finished, rice cooking is finished, and the control unit 20 starts control of heat retention. The pressure regulating valve 13b is opened by the opening means 17, and the rice is kept at about 74 ° C. by energizing the main heating means 14 and the lid heating means 16 intermittently. Even during the heat insulation, the condensed water accumulated in the dew receiving tray 21 is heated and steam is slowly generated. When the outer lid 2 is opened to eat rice during the heat insulation, the air inside the inner pot 4 is replaced with dry outside air, but when the outer lid 2 is closed, it is humidified by the gently generated steam. It is possible to prevent moisture from being removed from the rice.

  The heating of the dew receiving tray 21 at the time of steaming or moisturizing is performed by heating the condensed water accumulated in the dew receiving tray 21 by the lid heating means 16 and vaporizing it. Since the dew condensation tray 21 used in this embodiment uses SPS resin, the dewth tray 21 is difficult to heat because it has a larger heat capacity and higher heat resistance than the aluminum plate material used in the prior art.

  For this reason, even when the average temperature is obtained by energization control by ON / OFF of the lid heating means 16 in order to obtain the temperature required for heat retention, the temperature change of the dew condensation tray 21 made of SPS resin becomes slow, and the lid heating is performed. With respect to the temperature change of the lid heating means 16 when the means 16 is energized ON / OFF, the width of the temperature change of the dew condensation tray 21 becomes smaller and the difference between the average temperature and the peak temperature becomes smaller. As a result, the breadth of the temperature change of the rice at the time of heat insulation becomes small, the heat insulation which reduced the drying of rice becomes possible, and the rice cooker which can heat the rice more deliciously can be provided.

  In addition, since the material of the dew condensation tray 21 is made of SPS resin, a large amount of dew condensation water can be stored, steam can be given to the rice in the inner pot for a long time during heat insulation, and the moisture retention performance can be improved. Can be kept warm.

  Further, the material of the condensation tray 21 is made of SPS resin, a space 24 is formed between the inner lid 3 and the condensation tray 21, and the surface 21 g of the condensation tray 21 is below (inside) the upper end surface of the inner pot 4. Since it has been submerged, the heat retaining performance in the inner pot 4 is improved, the energization rate to the lid heating means 16 during the heat retaining is reduced, and energy saving and rice drying can be further reduced.

  When cooking is finished, the user opens the outer lid 2 to eat rice. Since the surface facing the inner pot 4 has dew on the surface of the dew condensation tray 21, when the outer lid 2 is opened, the dew adhering to the surface 21g of the dew tray 21 flows downward, and the dew It flows along the inclined portion 22a and flows from the recovery port 22 to the water reservoir portion 21d.

  Further, since the recovery port 22 and the tray 21a of the dew receiving tray 21 are integrally formed of resin, there are no joints or steps, and the dew adhering to the surface 21g of the dew receiving tray 21 flows smoothly to the recovery port 22. Therefore, there is no fear that water drops hang on the rice inside the inner pot 4 or over the bank portion 22b of the dew receiving tray 21 and spills on the floor surface.

  Even when the inner hook 4, the inner lid 3, and the dew condensation tray 21 are removed from the main body 1 and the outer lid 2 for cleaning after use, the dew condensation tray 21 has no steps or seams due to the joining of parts, so that it is easy to clean. It is good.

  In addition, the number of parts of the dew receiving tray 21 is small, and since it is integrally molded with the SPS resin, the conventional fluororesin coating is unnecessary and the environment is considered.

  According to the above-described embodiment, it is possible to prevent the condensed water from falling on the rice when the lid is opened.

  DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Outer lid, 2a ... Hinge shaft, 3 ... Inner lid, 4 ... Inner hook, 8 ... Exhaust port, 13 ... Pressure adjusting means, 14 ... Main heating means, 16 ... lid heating means, 17 ... opening means, 20 ... control part, 21 ... condensation tray, 21a ... dish part, 21b ... rise wall 21c ... Seal packing, 21d ... Water reservoir, 21e ... Steam hole, 22 ... Recovery port, 22a ... Inclined part, 34 ... Packing, 35 ... Solid surface, 36 ... liquid, 37 ... contact angle, 38 ... contact angle with flat surface, 39 ... contact angle with rough surface, 40 ... ball shape, 41 ... filed shape, 42 ... Mesh shape

Claims (2)

The body,
An outer lid that covers the upper surface opening of the main body and opens and closes with the hinge shaft as a fulcrum;
An inner pot stored in the main body,
An inner lid that covers the upper surface opening of the inner hook and is attached to the outer lid;
A dew receiving tray that is attached to the lower surface of the inner lid and collects dew condensation water, and
The condensation tray is formed by integrally molding a material having a higher heat capacity and higher heat resistance than an aluminum material,
When the outer lid is opened, a recovery port is provided for guiding condensed water adhering to the surface of the condensation tray.
A rice cooker characterized in that the surface of the dew condensation tray is subjected to a roughing process to make the dew condensation water easily wet the dew condensation tray.   2. The rice cooker according to claim 1, wherein the surface of the dew condensation pan is subjected to any one of a ball shape, a file shape, and a mesh shape.

Images