JPH08182608A - Induction heating rice cooker - Google Patents

Abstract

PURPOSE: To provide an induction heating rice cooker having a cooking function enhanced via the application of the generated heat of an induction heating coil. CONSTITUTION: This rice cooker has an inner vessel 4 for housing a pot body 3, a coil housing section 10 formed under the vessel 4, an induction heating coil 12 laid in the housing section 10, an air passage 8 formed between the external surface of the body 3 and the internal surface of the vessel 4, and a heat convection fan 16 for discharging the air from the housing section 10 to the passage 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating rice cooker for heating rice by electromagnetic induction.

[0002]

2. Description of the Related Art An induction heating rice cooker utilizing electromagnetic induction is
It is known for its excellent rice cooking function. In this type of conventional induction heating rice cooker, a rice cooker main body is placed above the induction heating coil. The inner main body of the rice cooker uses a non-magnetic material made of aluminum and the outer surface of the cooker is made of stainless steel. Alternatively, a clad material is formed by stacking magnetic materials made of iron.

Then, the magnetic flux generated by the induction heating coil is incident on the bottom of the pot main body to generate an eddy current due to the magnetic flux in the pot main body, and Joule heat due to the eddy current causes the pot main body to generate heat to cook rice. I have to. In addition, the air whose temperature has risen due to the heat of the induction heating coil that self-heats due to energization is exhausted to the outside from the exhaust port by the fan, and the temperature rise of the induction heating coil is suppressed.

[0004]

As described above, in the conventional induction heating rice cooker, the air whose temperature has risen due to the self-heating induction heating coil is exhausted to the outside by the fan,
There is a problem that there is a waste in utilizing the heat generated by the self-heating of the induction heating coil. In view of such a problem, it is an object of the present invention to provide an induction heating rice cooker that effectively utilizes the heat generated by the induction heating coil and has a good rice cooking function and high heating efficiency.

[0005]

The induction heating rice cooker according to the first aspect of the present invention is an induction heating rice cooker that heats a pot body by magnetic flux generated by an induction heating coil to cook rice. It is characterized by comprising a fan for exhausting air and an air passage for allowing the exhaust air from the fan to flow along the outer surface of the hook main body.

An induction heating rice cooker according to a second aspect of the invention is an induction heating rice cooker for heating rice by heating the kettle body with magnetic flux generated by an induction heating coil, the induction heating rice cooker being positioned below the pot body. A coil accommodating portion accommodating the induction heating coil, an air passage for allowing air to flow along the outer surface of the kettle body, and a coil accommodating portion provided at a position communicating with the air passage, And a fan for exhausting the air in the storage portion to the air passage.

An induction heating rice cooker according to a third aspect of the invention is an induction heating rice cooker for heating rice by heating the kettle body with magnetic flux generated by an induction heating coil, the induction heating rice cooker being located below the pot body. A coil accommodating portion accommodating the induction heating coil, and a ventilation hole formed in a lower portion of the coil accommodating portion,
An air passage that allows air to flow along the outer surface of the shuttle body is provided, and the coil housing portion and the air passage are communicated with each other.

An induction heating rice cooker according to a fourth aspect of the present invention is an induction heating rice cooker for heating rice by heating the kettle body with magnetic flux generated by an induction heating coil, the induction heating rice cooker being located below the pot body. A coil accommodating portion accommodating the induction heating coil, and a ventilation hole formed in an upper portion of the coil accommodating portion,
An air passage for allowing air to flow along the outer side surface of the hook main body, and the coil housing portion and the air passage are communicated with each other through the ventilation hole.

[0009]

In the first aspect of the invention, the pot body is heated by the magnetic flux generated by the induction heating coil. By driving the fan, the air whose temperature has risen due to the heat generated by the induction heating coil is discharged to the air passage. The air discharged to the air passage heats the outer surface of the kettle body, and the convection of water in the kettle body becomes active on the outer peripheral side. Exhaust air to cool the induction heating coil. Thus, the heat generated by the induction heating coil can be used to heat the kettle body to promote the external convection of water from the outer peripheral side of the kettle body toward the upper center.

In the second aspect of the invention, the pot main body is heated by the magnetic flux generated by the induction heating coil. The fan is driven to exhaust the air in the coil housing portion, the temperature of which has risen due to the heat generated by the induction heating coil, to the air passage. The air discharged to the air passage heats the outer surface of the kettle body, and the convection of water in the kettle body becomes active on the outer peripheral side. Exhaust air to cool the induction heating coil. Thus, the heat generated by the induction heating coil can be used to heat the kettle body to promote the external convection of water from the outer peripheral side of the kettle body toward the upper center.

In the third aspect of the invention, the pot body is heated by the magnetic flux generated by the induction heating coil. The air in the coil housing portion, whose temperature has risen due to the heat generated by the induction heating coil, flows into the air passage. The outside surface of the kettle body is heated by the air flowing into the air passage. As the air in the coil housing portion flows into the air passage, the air flows into the coil housing portion from the ventilation holes to cool the induction heating coil. Thus, the heat generated by the induction heating coil can be used to heat the kettle body to promote the external convection of water from the outer peripheral side of the kettle body toward the upper center.

In the fourth aspect of the invention, the main body of the pot is heated by the magnetic flux generated by the induction heating coil. The air whose temperature has risen due to the heat generated by the induction heating coil flows into the air passage through the ventilation hole provided in the upper part of the coil housing. The outside surface of the kettle body is heated by the air flowing into the air passage. As the air in the coil housing portion flows into the air passage, the air flows into the coil housing portion to cool the induction heating coil. Thus, the heat generated by the induction heating coil can be used to heat the kettle body to promote the external convection of water from the outer peripheral side of the kettle body toward the upper center.

[0013]

The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic sectional view showing the configuration of a first embodiment of an induction heating rice cooker according to the present invention, and FIG. 2 is a top view of the induction heating rice cooker. In the outer case 2 of the induction heating rice cooker 1, a pot main body 3 which is a rice cooker and an inner container 4 into which the pot main body 3 is fitted are housed. The pot main body 3 is made of an aluminum material on the inner peripheral side, and is laminated on the outer peripheral side with a magnetic material such as iron or ferromagnetic stainless steel that generates heat by magnetic flux.

The inner container 4 is made of a material such as ceramics or heat-resistant resin that allows magnetic flux to pass therethrough, and is open at the upper side to enclose the pot main body 3 from below. A control panel 2a is provided near one side of the upper part of the outer case 2, and an intake port 2c is provided near one side of the bottom surface 2b of the outer case 2.
Is provided. An upper lid 5 is attached to the upper part of the outer case 2 so that one side is rotatably supported with the control panel 2a side as a fulcrum and the other side is attached so as to be vertically movable to open and close the upper opening of the inner container 4. An upper cover vapor jet port 5a is provided on the opposite side of the upper cover 5 from the control panel 2a side. On the lower surface side of the upper lid 5, there is provided an inner lid supporting metal fitting 6 extending downward in the central portion of the upper lid 5, and the inner lid supporting metal fitting 6 opens and closes the upper opening 3a of the pot main body 3. 7 is attached. On the inner lid 7, the inner lid steam outlets 7a, 7a, 7a are provided at a plurality of positions not facing the upper lid steam outlet 5a.
a is provided.

The shuttle main body 3 is supported so that the inner peripheral surface of the internal container 4 and the external peripheral surface of the shuttle main body 3 are separated from each other by an appropriate length, and the wind is generated between the internal container 4 and the shuttle main body 3. The path 8 is formed. An opening 4a is opened in the lower part of the inner container 4 on the control panel 2a side. On the side of the opening 4a, the bottom of the inner container 4 extends in the direction of the outer case 2, and the tip of the inner container 4 rises upward, and the rising portion causes water droplets in the inner container 4 to escape from the inner container 4. A water seal portion 4b is formed so as not to drip. A partition 18 is provided at the same height as the bottom of the inner container 4 on the side where the control panel 2a is not provided, and the inside of the outer case 2 is airtightly isolated above and below.

The remaining peripheral surface side of the inner container 4 not shown in FIG. 1 is similarly isolated by extending the partition wall 18.
In addition, below the inner container 4, an induction heating coil holding plate 9 whose end is separated from the inner surface of the outer case 2 by an appropriate length is arranged. The induction heating coil holding plate 9 is made of a material through which magnetic flux can pass. A coil housing portion 10 is formed between the induction heating coil holding plate 9 and the inner container 4. The lower end of the box-shaped fan case 11 is airtightly joined to the end of the induction heating coil holding plate 9 on the side of the water seal 4b, and the upper end of the fan case 11 is open at the opening 4a of the inner container 4. Is airtightly joined to the outer surface of the side. As a result, the inside of the fan case 11 is communicated with the inside of the air passage 8 and the inside of the coil housing portion 10 and is airtightly isolated from the inside of the exterior case 2. That is, the inside of the coil housing portion 10 is
The air passage 8 communicates with the inside of the fan case 11.

A pancake-shaped induction heating coil 12 is provided on the upper surface of the induction heating coil holding plate 9, that is, in the coil housing portion 10. The rectangular parallelepiped ferrites 13, 13 are arranged along the radial direction of the induction heating coil 12. Below the ferrites 13 and 13, an inverter circuit for driving the induction heating coil 12 and a control circuit section 14 for driving and controlling the inverter circuit according to the temperature of the pot body 3 are arranged. A motor M mounted on a motor mounting plate 15 extending from the inner surface of the outer case 2 is disposed on the lower surface side of the induction heating coil holding plate 9 at the position where the fan case 11 is disposed. The induction heating coil holding plate 9 is provided on one side of the rotation shaft of the motor M.
And extends into the fan case 11, and a thermal convection fan 16 is attached to its rotating shaft. On the other side of the rotation shaft of the motor M, a control circuit section cooling fan 17 is attached in close proximity to the intake port 2c. The motor M is driven and controlled by the control operation of the control circuit section 14. A pot bottom temperature sensor S is provided at the bottom of the inner container 4 facing the center of the induction heating coil 12.

Next, the rice cooking operation of the induction heating rice cooker configured as described above will be described. The upper lid 5 is opened, the pot main body 3 in the inner container 4 is taken out, and a predetermined amount of rice and water necessary for cooking rice are put in the pot main body 3. When the pot main body 3 containing rice and water is fitted into the inner container 4 and the upper lid 5 is closed, the inner lid 7 closes the upper opening 3a of the pot main body 3. After that, when the control panel 2a is operated to perform a predetermined rice cooking operation, the control circuit unit 14 starts the control operation and the induction heating coil.
Energize 12 As a result, a magnetic flux is generated in the induction heating coil 12, and the generated magnetic flux is incident on the bottom of the pot main body 3 to heat the bottom of the pot main body 3 to heat the pot main body 3. As a result, outside convection of water indicated by the arrow W from the outer peripheral side toward the center of the upper part is generated in the pot main body 3 to perform the rice cooking operation.

The induction heating coil 12 self-heats when energized, and the temperature of the air in the coil housing 10 rises.
When the temperature inside the coil housing section 10 reaches a predetermined temperature, the control circuit section 14
The motor M is drive-controlled by the motor M, and the motor M starts to rotate and the heat-convection fan 16 exhausts the temperature-increased air in the coil housing 10 to the air passage 8. The exhausted air flows through the air passage 8 along the outer side surface of the hook main body 3, and the air is discharged from the air passage 8 to the inner lid 7.
Between the upper lid 5 and the upper lid 5 and forced convection that flows outward from the upper lid vapor jet port 5a is indicated by solid arrows. Therefore, the kettle body 3 is heated by the heat generated by the magnetic flux and the heat of the air that has been exhausted at a high temperature, and the temperature on the outer peripheral side of the kettle body 3 becomes higher than the temperature near the center of the kettle body 3. The convection along the inner surface of 3 becomes active, and promotes the outer convection indicated by the broken line arrow W. Further, the steam generated in the pot main body 3 is ejected from the inner lid vapor ejection ports 7a, 7a and flows out from the upper lid vapor ejection port 5a to the outside.

On the other hand, when the motor M is driven, the control circuit section cooling fan 17 sucks air from the intake port 2c and blows it to the control circuit section 14 to cool the control circuit section 14. In this way, the heat generated in the induction heating coil 12 is used to make the pot body 3
It is possible to further increase the side surface temperature and improve the heating efficiency.

When the steam generated in the pot main body 3 flows out from the upper cover steam outlet 5a, the vicinity of the upper cover steam outlet 5a becomes a negative pressure to enhance the exhaust air of the air flowing through the air passage 8. This means that the air having a high temperature is allowed to flow along the outer side surface of the kettle body 3 to enhance the heating of the kettle body 3. When the predetermined rice cooking time has elapsed, the induction heating coil 12 is de-energized, the motor M is stopped, and the rice cooking operation is completed. When such a rice cooking operation is performed, it is possible to prevent the air having a high temperature flowing through the air passage 8 from coming into contact with the inner surface of the upper lid 5 and condensing on the inner surface of the upper lid 5. Further, since the water sealing portion 4b is provided, the water droplets inside the inner container 4 do not drop, and the induction heating coil 12 can be protected from the water droplets.

FIG. 3 shows a second induction heating rice cooker according to the present invention.
It is a typical sectional view of an example. An opening 4a is formed in the lower side surface of the inner container 4, the bottom of the inner container 4 extends for a proper length in the direction of approaching the inner surface of the outer case 2, and the tip end thereof rises upward with a proper length. The water seal portion 4b is formed. The induction heating coil holding plate 13 is airtightly joined to the inner surface of the outer case 2 on the side where the control panel 2a is not provided, and is separated from the outer case 2 on the control panel 2a side. A portion that connects the opening 4a and the coil housing portion 10 is airtightly covered by a partition wall 21, and the inside of the partition wall 21 is airtightly isolated from the inside of the outer case 2. Further, the other peripheral surface side of the inner container 4 which is not shown in FIG. 3 is also similarly configured by the partition wall 21. A ventilation hole 9a is formed at a position of the induction heating coil holding plate 9 facing the center of the induction heating coil 12. As a result, the inside of the exterior case 2 is communicated with the inside of the coil housing portion 10 only through the ventilation holes 9a, and the inside of the coil housing portion 10 is communicated with the air passage 8.

At the bottom of the inner container 4, a pot bottom temperature sensor S is arranged at a position facing the ventilation hole 9a. A motor M mounted by a motor mounting plate 15 is arranged on the lower surface of the induction heating coil holding plate 9 on the intake port 2c side. A fan 17 for cooling the control circuit is attached to the rotating shaft of the motor M. The other configuration is the same as the configuration other than the heat convection fan 16 in FIG. 1, and the same components are designated by the same reference numerals.

This induction heating rice cooker 1 has an induction heating coil.
By energizing 12, the pot body 3 is heated and the rice cooking operation is performed in the same manner as described above. In addition, induction heating coil
12 heats up. Then, when the temperature of the air in the coil housing portion 10 rises, the temperature-increased air flows into the air passage 8 through the inside of the partition wall 21, and the space between the upper lid 5 and the inner lid 7 is passed from the upper portion of the air passage 8. It flows out from the street top vapor outlet 5a. When air having a high temperature flows through the air passage 8 in this manner, the air heats the outer surface of the pot body 3 in the same manner as described above. Then, as the air flows out from the coil housing portion 10, the air on the control circuit portion 14 side flows into the coil housing portion 10 through the ventilation holes 9a and cools the induction heating coil 12. In this way, natural convection indicated by solid arrows is generated. As a result, the heat generated by the induction heating coil 12 is used to heat the outer surface of the pot body 3 to promote the external convection in the pot body 3 indicated by the broken line arrow W. In addition, by the control circuit cooling fan 17, the intake port 2c
The air sucked from the air is blown to the control circuit unit 14 to cool the control circuit unit 14. The same effect as described above can be obtained by such natural convection.

FIG. 4 shows a third induction heating rice cooker according to the present invention.
It is a typical sectional view of an example. Inside the outer case 2, at a position at the same height as the bottom of the inner container 4, the upper space P is formed by the partition wall 18 that is disposed so as to straddle the inner container 4 and the outer case 2.
And the lower space Q are airtightly isolated. A ventilation hole 4c is provided at the bottom of the inner container 4 corresponding to the center of the induction heating coil 12, and the inside of the inner container 4 is communicated with the coil housing portion 10 only through the ventilation hole 4c. In addition, FIG.
The remaining peripheral surface side, which is not shown in FIG. 5, is also similarly configured by the partition wall 18.

The end portion of the inner container 4 at the opening position of the ventilation hole 4c is erected upward with a proper length, and the erected portion forms a water sealing portion 4d for preventing water droplets from falling from the inside of the inner container 4. ing. Below the induction heating coil 12, an induction heating coil holding plate 9 having no ventilation hole is arranged. A pot bottom temperature sensor S is provided above the ventilation hole 4c.
The other configuration is the same as that of FIG. 3 except the opening 4a and the partition wall 21, and the same components are denoted by the same reference numerals.

This induction heating rice cooker 1 has an induction heating coil.
By energizing 12, the pot body 3 is heated and rice is cooked in the same manner as described above. Then, the induction heating coil 12 self-heats, and the temperature-increased air in the coil housing portion 10 flows into the air passage 8 through the ventilation holes 4c to heat the bottom portion and the outer side surface of the pot main body 3, It flows from the upper part of the passage 8 through the space between the upper lid 5 and the inner lid 7 to the outside through the upper lid vapor jet port 5a. When the air in the coil housing portion 10 flows out from the ventilation hole 4c,
Air flows into the coil housing portion 10 from the outer peripheral side of the induction heating coil 12 to cool the induction heating coil 12. Then, the outer surface of the kettle body 3 is further heated by the air having a high temperature flowing out from the coil accommodating portion 10, and the outer convection of water indicated by the broken line arrow W in the kettle body 3 is promoted in the same manner as described above.

The control circuit cooling fan 17 blows the air sucked from the intake port 2c to the control circuit 14 to cool the control circuit 14. Also in this case, the same effect as described above can be obtained. Therefore, in any of the first, second, and third embodiments, the heat generated by the self-heating of the induction heating coil 12 can be effectively used for heating the pot main body, and the rice cooking function can be improved. The efficiency can be further increased. In this embodiment, the induction heating coil is a single pancake-shaped coil, but the same effect can be obtained even if two pancake-shaped coils are concentrically arranged.

[0029]

As described above in detail, according to the first invention,
The air whose temperature has risen due to the heat generated by the induction heating coil is forcibly exhausted to the air duct by the fan, and the outer surface of the pot main body is further heated to promote the external convection of the water inside the pot main body. It is possible to provide an induction-heated rice cooker having good heating efficiency and high heating efficiency.

According to the second aspect of the invention, the air in the coil housing portion, the temperature of which has risen due to the heat generated by the induction heating coil, is forcibly exhausted to the air passage by the fan, and the outer surface of the pot body is further heated.
It is possible to provide an induction heating rice cooker that can promote the external convection of water in the pot body, have a good rice cooking function, and have high heating efficiency.

According to the third aspect of the invention, the air in the coil housing portion, the temperature of which has risen due to the heat generated by the induction heating coil, is allowed to flow into the air passage by natural convection through the ventilation holes provided in the lower portion of the coil housing portion. It is possible to provide an induction heating rice cooker that can further heat the outer surface to promote the external convection of water in the pot main body, has a good rice cooking function, and high heating efficiency.

According to the fourth aspect of the invention, the air in the coil housing portion, the temperature of which has risen due to the heat generated by the induction heating coil, is caused to flow into the air passage by natural convection flowing through the ventilation holes provided in the upper portion of the coil housing portion. The bottom part and the outer side surface of the pot main body can be heated to promote the external convection of the water in the pot main body, and the excellent effect of being able to provide an induction heating rice cooker with a good rice cooking function and high heating efficiency, etc. .

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a first embodiment of an induction heating rice cooker according to the present invention.

FIG. 2 is a schematic top view of an induction heating rice cooker.

FIG. 3 is a schematic cross-sectional view of a second embodiment of the induction heating rice cooker according to the present invention.

FIG. 4 is a schematic sectional view of a third embodiment of the induction heating rice cooker according to the present invention.

[Explanation of symbols]

 1 induction heating rice cooker 3 pot main body 4 inner container 4a opening 4c ventilation hole 8 air passage 9a ventilation hole 10 coil housing 12 induction heating coil 16 heat convection fan M motor

Claims (4)

[Claims] 1. An induction heating rice cooker that cooks rice by heating the pot body by magnetic flux generated by an induction heating coil,
A fan for exhausting air around the induction heating coil,
An induction heating rice cooker, comprising: an air passage for allowing exhaust air from the fan to flow along the outer surface of the pot main body. 2. An induction heating rice cooker that cooks rice by heating the pot body with magnetic flux generated by an induction heating coil,
A coil accommodating portion that is located below the kettle body and accommodates the induction heating coil, an air passage that allows air to flow along an outer surface of the kettle body, the coil accommodating portion, and the An induction heating rice cooker, which is provided at a position where the air passage is communicated with, and is provided with a fan that exhausts air in the coil housing portion to the air passage. 3. An induction heating rice cooker that cooks rice by heating the pot body with magnetic flux generated by an induction heating coil,
A coil accommodating portion, which is located below the kettle body and accommodates the induction heating coil, a ventilation hole formed in a lower portion of the coil accommodating portion, and air along the outer surface of the kettle body. An induction heating rice cooker, comprising: an air passage through which air flows, and the coil housing portion and the air passage communicate with each other. 4. An induction heating rice cooker for heating rice by heating the pot body with magnetic flux generated by an induction heating coil,
A coil accommodating portion that is located below the kettle body and accommodates the induction heating coil, a ventilation hole formed in the upper portion of the coil accommodating portion, and air along the outer surface of the kettle body. An induction heating rice cooker, comprising: an air passage through which air flows, and the coil housing portion and the air passage communicate with each other through the air passage.