JP6624971B2 - rice cooker - Google Patents

Description

  The present invention relates to a rice cooker that seals a space between an inner case and an inner pot accommodated in the inner case.

  As a conventional rice cooker, a seal member made of a heat insulating elastic member is provided on the periphery of the opening of the inner case of the rice cooker main body, and a groove formed by two rows of protrusions and a mounting hole on the periphery of the opening of the inner case. The seal member is fixed in a bank shape by a groove formed by two rows of protrusions and a mounting hole, and an upper portion of the seal member is protruded from the groove (for example, see Patent Document 1). ).

Japanese Patent No. 4822915

  In the conventional rice cooker described above, the seal member is fixed by the groove formed by the two rows of projections and the mounting hole. However, since the seal member is partially fixed, it is easy to come off or the seal member is There has been a problem that portions other than the mounting holes are easily lifted.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a rice cooker capable of securely fixing a sealing member without being lifted up and preventing leakage of heat energy generated during cooking and warming. The purpose is to obtain.

The rice cooker according to the present invention has a rice cooker main body having a cylindrical inner case with a bottom inside, an inner pot that is housed in the inner case so as to be able to be taken out, and a flange is formed on a peripheral edge at an upper end, and an inner case. A seal member provided so as to surround the periphery of the opening and having a plurality of ring-shaped protrusions provided along the radial direction at an upper end, and a holding portion for holding and holding both side surfaces of the seal member When the inner pot is housed in the inner case, each of the projections of the seal member abuts on the lower surface of the flange of the inner pot to support the inner pot . The height is formed lower than the outer peripheral side protrusion .

According to the present invention, since both sides of the seal member are held and held by the holding portion, the seal member does not float or come off.
Also, when the inner pot is housed in the inner case of the rice cooker main body, the plurality of radial projections provided at the upper end of the sealing member are in close contact with the lower surface of the flange of the inner pot, respectively. Is securely sealed. For this reason, it is possible to suppress leakage of heat energy generated between the inner pot and the inner case during cooking and keeping the temperature warm.

It is a perspective view which opens and shows the lid of the rice cooker which concerns on embodiment of this invention. It is sectional drawing which shows the state which removed the inner pot in the rice cooker of FIG. It is a perspective view which shows the state which removed the inner pot in the rice cooker of FIG. FIG. 3 is an enlarged sectional view of a portion A shown in FIG. 2. It is sectional drawing which shows the state which supported the flange of the inner hook by the sealing member of FIG. FIG. 5 is a cross-sectional view illustrating a first modification of the seal member of FIG. 4. It is sectional drawing which shows the modification 2 of the seal member of FIG.

  FIG. 1 is a perspective view showing a rice cooker according to an embodiment of the present invention with a lid opened, FIG. 2 is a cross-sectional view showing the rice cooker of FIG. 1 with an inner pot removed, and FIG. 3 is a rice cooker of FIG. It is a perspective view which shows the state which removed the inner hook in the container.

  As shown in FIG. 1, a rice cooker 1 according to the present embodiment has a rice cooker main body 2 having a bottomed inner cylindrical case 11 therein, and a lid 3 provided on the rice cooker main body 2 so as to be freely opened and closed. And an inner pot 4 which is housed in the inner case 11 so as to be freely taken out. When the inner pot 4 is accommodated in the inner case 11, a space is formed between the inner pot 4 and the inner case 11. A steam recovery tank 5 is detachably attached to the front of the rice cooker main body 2. An inner lid 6 is detachably attached to the inside of the lid 3.

  On the front surface of the lid 3, a lid opening / closing button 7 for opening and closing the lid 3 is provided. A flange 4 a formed by being bent outward is provided at a peripheral portion of the opening of the inner hook 4. A ring-shaped packing 6 a made of, for example, silicone rubber is attached to a peripheral portion of the inner lid 6. When the lid 3 is closed, the packing 6a abuts on the upper surface of the flange 4a of the inner hook 4 and closes the opening of the inner hook 4 in a sealed state.

  As shown in FIG. 2, the inside of the rice cooker main body 2 includes a heat shield plate 11a formed in a cylindrical shape, and a substantially deep dish-shaped coil stand 11b installed below the heat shield plate 11a. An inner case 11 is provided. A seal member 31 is provided above the inner case 11. As shown in FIG. 3, the seal member 31 is formed in a ring shape and is provided so as to surround the periphery of the opening of the inner case. A body heater 12 is closely attached to the outer peripheral surface of the heat shield plate 11a. The body heater 12 is energized at the time of cooking rice and at the time of keeping heat to generate heat. Note that, instead of the body heater 12, an induction heating coil may be provided on the outer peripheral surface of the heat shield plate 11a.

  An induction heating coil 13 is wound around and fixed to the outer surface (bottom and corner) of the inner case 11. The induction heating coil 13 generates an alternating magnetic field when energized, and heats the inner pot 4 by electromagnetic induction. Further, a temperature sensor 14 is provided at the center of the inner case 11 to contact the bottom of the inner pot 4 and detect the temperature of the inner pot 4.

  A power supply board 15 is provided inside the rice cooker main body 2 on the rear side. The power supply substrate 15 is fixed to a substrate holder 16 installed on the solder surface (back surface) side. The power supply board 15 has mounted thereon switching elements for supplying electric power to the induction heating coil 13 and other electronic components. Further, a radiator 17 that is in contact with the switching element is attached to the power supply board 15 described above. The radiator 17 has a plurality of radiating fins arranged at regular intervals, and is formed of an aluminum alloy having good thermal conductivity. A cooling fan 18 is provided below the radiator 17.

  An operation board 19 is mounted inside the lid 3. On the operation board 19, a microcomputer (not shown) including a control unit for controlling energization to the body heater 12 and the induction heating coil 13, other electronic components, and the like are mounted. An operation panel 20 including a menu selection switch, a rice cooker switch, a liquid crystal display, and the like is provided at a position on the operation board 19 of the lid 3.

Next, the configuration of the seal member 31 and the holding portion 41 that holds the seal member 31 will be described with reference to FIG.
FIG. 4 is an enlarged sectional view of a portion A shown in FIG.

  As shown in FIG. 4, the seal member 31 is vertically elongated in the axial direction of the inner case 11, and is made of, for example, silicon rubber having heat resistance and elasticity. The seal member 31 is formed in a ring shape as described above, and has a plate portion 32 which is a vertically long central portion, and, for example, two triangular protrusions 33 and 34 provided at an upper end of the plate portion 32 in a radial direction. And two forked legs 35 and 36 provided below the plate portion 32. Although two triangular protrusions are provided, three protrusions may be provided in the radial direction, depending on the thickness of the plate portion 32.

  The plate portion 32 is formed in a ring shape, and has a concave portion 32a that is concave inward on the outer peripheral surface. The protrusions 33 and 34 are formed on the upper end of the plate 32 over the entire circumference. The projections 33 and 34 have the same apex angle and height, and a ring-shaped groove 37 is formed between the projections 33 and 34. One of the legs 35, 36 is formed at the lower end in the vertical direction of the plate 32, and the other leg 36 extends outward from a lower portion of the outer peripheral surface of the plate 32. And is bent downward. A ring-shaped groove 38 whose lower part is open is formed between the legs 35 and 36.

  The holding unit 41 includes a first holding unit 42 and a second holding unit 43. The first holding portion 42 is formed in a ring shape and attached to the frame 21 of the rice cooker main body 2, and has a ring-shaped inner frame portion 42 a abutting on the inner peripheral surface of the plate portion 32 of the seal member 31. A ring-shaped protrusion 42b that fits into the groove 38 formed between the legs 35 and 36 is provided so as to surround the inner frame 42a via the protrusion 42b, and is lower than the inner frame 42a. And an outer frame portion 42c formed. The outer frame portion 42c is provided with a support portion 42d lower inside than the outer frame portion 42c.

  The second holding portion 43 has a ring shape, and is formed by a restraining portion 43a fitted into the concave portion 32a of the plate portion 32, and extending outward from the restraining portion 43a and bent downward to form a first holding portion. An insertion portion 43b supported by a support portion 42d of the holding portion 42, and a reinforcing portion 43c provided on an outer peripheral surface of the insertion portion 43b and locked to an upper end of an outer frame portion 42c of the first holding portion 42 are provided. I have.

Here, mounting and holding of the seal member 31 will be described.
When the seal member 31 is attached to the first holding portion 42 provided on the frame 21 of the rice cooker main body 2, the sealing is performed such that the inner frame portion 42 a of the first holding portion 42 is inserted into the ring of the seal member 31. The plate portion 32 of the member 31 is lowered along the inner frame portion 42a. Then, the protrusion 42 b of the first holding portion 42 is inserted into the groove 38 formed between the legs 35 and 36 of the seal member 31, and the legs 35 and 36 are placed on the first holding portion 42.

  Next, when holding the seal member 31 into which the inner frame portion 42a of the first holding portion 42 is inserted, the insertion portion 43b of the second holding portion 43 is moved to the inner peripheral surface of the outer frame portion 42c of the first holding portion 42. And push it down. When the insertion portion 43b is further pushed in, the insertion portion 43b comes into contact with the support portion 42d of the first holding portion 42, and the reinforcing portion 43c of the second holding portion 43 is moved to the outer frame portion of the first holding portion 42. 42c.

  At this time, the stopping portion 43a of the second holding portion 43 fits into the concave portion 32a of the plate portion 32, and sandwiches the plate portion 32 of the seal member 31 with the inner frame portion 42a of the first holding portion 42. The leg portion 36 of the seal member 31 is held between the protrusion 42b of the holding portion 42 and the seal member 31 to hold the seal member 31. The reinforcing portion 43c of the second holding portion 43 is provided to prevent the seal member 31 from coming off due to an impact received when the rice cooker 1 falls over for some reason or falls.

The operation of the seal member 31 in the rice cooker configured as described above will be described with reference to FIG.
FIG. 5 is a sectional view showing a state where the flange of the inner hook is supported by the seal member of FIG.
When the inner pot 4 is accommodated in the inner case 11 of the rice cooker main body 2 (see FIG. 1), the lower surface of the flange 4a of the inner pot 4 comes into contact with the projections 33, 34 of the seal member 31, and the projections 33, The tip of 34 is crushed by the weight of the inner pot 4. The crushed double projections 33 and 34 are in close contact with the lower surfaces of the flanges 4a, respectively, and seal the space between the inner hook 4 and the inner case. At this time, the plate portion 32 of the seal member 31 held between the first holding portion 42 and the second holding portion 43 supports the inner shuttle 4 via the flange 4a.

  As described above, according to the present embodiment, the entire periphery of the plate portion 32 and the leg portion 36 of the seal member 31 is held by being held between the first holding portion 42 and the second holding portion 43. Therefore, the sealing member 31 does not rise or come off.

  Further, when the inner pot 11 is accommodated in the inner case 11 of the rice cooker main body 2, the double radial projections 33 and 34 provided at the upper end of the seal member 31 are provided on the lower surface of the flange 4 a of the inner pot 4. Since they are in close contact with each other, the space between the inner pot 4 and the inner case is securely sealed. Therefore, it is possible to suppress the leakage of heat energy generated between the inner pot 4 and the inner case 11 during cooking and keeping the temperature.

  Further, even if the inner hook 4 is shifted to one side of the inner case 11 and the projections 33, 34 of the seal member 31 abut on the bent portion of the flange 4a, the double projections 33, 34 as described above. And the lower surface of the flange 4a. Therefore, leakage of heat energy generated between the inner pot 4 and the inner case at the time of cooking rice and keeping the temperature can be suppressed.

(Modification 1)
FIG. 6 is a sectional view showing a first modification of the seal member of FIG. Note that the same or corresponding parts as those of the embodiment are denoted by the same reference numerals and described.
In the embodiment, the projections 33 and 34 formed along the entire periphery of the upper end of the plate portion 32 have been described to have the same apex angle and height, but as a first modification, The inner projection 33 is formed lower than the outer projection 34 among the projections 33 and 34 of the seal member 31. The two protrusions 33 and 34 have a triangular shape as in the embodiment. The height of the protrusion 33 on the inner peripheral side is h1, and the height of the protrusion 34 on the outer peripheral side is h2. In this case, h1 <h2. The angles of the apex angles of the projections 33 and 34 are the same.

  As described above, by forming the height h1 of the protrusion 33 on the inner peripheral side lower than the height h2 of the protrusion 34 on the outer peripheral side, the inner hook 4 is accommodated in a state of being biased to one side of the inner case 11. Then, even if the inner projection 33 is in contact with the bent portion of the flange 4a, the height h1 of the inner projection 33 is low, so that the inner projection 33 is in close contact with the bent portion of the flange 4a. The state in which the flange 4a is in close contact with the flat portion by the side projection 34 becomes uniform, and leakage of heat energy generated between the inner pot 4 and the inner case during cooking and keeping the temperature can be suppressed.

  Although two triangular protrusions are provided, three protrusions may be provided in the radial direction, depending on the thickness of the plate portion 32. In this case, the height of the central protrusion is higher than the inner protrusion 33 and lower than the outer protrusion 34.

(Modification 2)
FIG. 7 is a sectional view showing a second modification of the seal member of FIG. Note that the same or corresponding parts as those of the embodiment are denoted by the same reference numerals and described.
As a second modification, of the protrusions 33 and 34 of the seal member 31, the thickness of the protrusion 33 on the inner peripheral side is formed to be thinner than the protrusion 34 on the outer peripheral side. The two projections 33 and 34 have a triangular shape as in the embodiment, and the thickness of the bottom of the inner projection 33 is w1 and the thickness of the bottom of the outer projection 34 is w2. In this case, w1 <w2. In this case, the angle of the apex angle of the protrusion 33 is smaller than the angle of the apex angle of the protrusion 34.

  As described above, by forming the thickness w1 of the protrusion 33 on the inner peripheral side to be smaller than the thickness w2 of the protrusion 34 on the outer peripheral side, the inner hook 4 is accommodated in one of the inner cases 11 in a state of being biased. Even if the projection 33 on the inner peripheral side comes into contact with the bent portion of the flange 4a, the thickness w1 of the projection 33 on the inner peripheral side is thin and the outer projection 33 is bent outward and adheres. Therefore, the state in which the flange 4a is in close contact with the flat portion by the outer peripheral side projection 34 is uniform, and the leakage of heat energy generated between the inner pot 4 and the inner case during cooking and keeping the temperature can be suppressed. .

  Although two triangular protrusions are provided, three protrusions may be provided in the radial direction, depending on the thickness of the plate portion 32. In this case, the thickness of the bottom of the central protrusion is thicker than the protrusion 33 on the inner peripheral side and thinner than the protrusion 34 on the outer peripheral side.

  1 rice cooker, 2 rice cooker main body, 3 lid, 4 inner pot, 4a flange, 5 steam recovery tank, 6 inner lid, 6a packing, 7 lid open / close button, 11 inner case, 11a heat shield plate, 11b coil stand, Reference Signs List 12 body heater, 13 induction heating coil, 14 temperature sensor, 15 power supply board, 16 substrate holder, 17 radiator, 18 cooling fan, 19 operation board, 20 operation panel, 21 frame, 31 seal member, 32 plate part, 32a Concave part, 33, 34 protrusion, 35, 36 leg, 37 groove, 38 groove, 41 holding part, 42 first holding part, 42a inner frame part, 42b protrusion part, 42c, outer frame part, 42d support part, 43 Second holding portion, 43a stopping portion, 43b insertion portion, 43c reinforcing portion.

Claims (3)

A rice cooker body having a bottomed cylindrical inner case inside,
An inner pot which is housed in the inner case so as to be able to be taken out, and a flange is formed on a peripheral edge of an upper end;
A seal member provided so as to surround the periphery of the opening of the inner case and having a plurality of ring-shaped protrusions provided along the radial direction at an upper end,
A holding portion for holding and holding both side surfaces of the seal member,
Each projection of the seal member, when the inner pot is housed in the inner case, abuts against the lower surface of the flange of the inner pot to support the inner pot ,
Of the plurality of protrusions, the protrusion on the inner peripheral side,
A rice cooker characterized in that the height is formed lower than the protrusion on the outer peripheral side . The rice cooker according to claim 1, wherein the inner protrusion of the plurality of protrusions is formed to be thinner than the outer protrusion. The holding unit,
A first holding portion having an inner frame portion abutting on an inner peripheral surface of the seal member mounted on the upper surface and an outer frame portion provided to surround the inner frame portion;
Fitted between the outer peripheral surface and the outer frame portion of the sealing member that abuts on the inner frame portion of the first holding portion, a second holding portion for holding the sandwich the both side surfaces of the sealing member and,
The rice cooker according to claim 1 or 2 , further comprising:

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