JPS6336766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating type rice cooker that utilizes radiant heat, and particularly to a rice cooker with improved thermal efficiency.

In a conventional rice cooker of this kind, the upper end flange of the pot is placed in a pot storage case, and a space surrounded by the pot and pot storage case is heated by a heater, and the radiant heat from the heater and the high-temperature air generated in the space are heated. Since the pot is heated by convection, the heat is radiated to the surrounding area from the entire circumferential wall of the pot storage case corresponding to the space, resulting in a large amount of heat loss. However, the temperature of the space around the peripheral wall of the pot, especially the middle part, is lower than the upper part and is not affected by the radiant heat from the heater, so the degree of heating is low, and the degree of heating of the pot is uneven. It was hot.

The present invention was made in view of the above circumstances, and an object of the present invention is to provide a rice cooker that can significantly reduce heat radiation from a pot storage case to the surroundings, greatly improve thermal efficiency, and even heat the entire pot uniformly. shall be.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cylindrical outer case provided with a bottom frame 1a, and an annular decorative frame 2 made of heat-resistant plastic is fitted onto the upper end. 3 is a pot storage case stored in the outer case 1, and the upper end of this case is the decorative frame 2.
It is fixed by screws etc. and,
This pot storage case 3 has an annular mounting step 4 in the middle part of the peripheral wall, and the inner diameter of the upper part of the mounting step 4 is larger than the inner diameter of the lower part of the mounting step 4. The diameter is set to be large by a predetermined dimension. 5 is an annular sheathed heater arranged at the inner bottom of the pot storage case 3 via a heat-resistant spacer 6, and 7 is a sensor provided at the center of the bottom of the pot storage case 3 to detect when the rice is cooked. It's a warm switch. Reference numeral 8 denotes a heat insulating material layer formed of a heat insulating material such as glass wool, which is disposed between the outer circumference of the pot storage case 3 and the inner circumference of the outer case 1; The thickness of the part facing the mounting step part 4 is set larger than the thickness of the part facing the upper part of the mounting step part 4,
Therefore, the heat insulating material layer 8 made of a heat insulating material is housed in the annular space between the outer circumference of the pot storage case 3 and the inner circumference of the outer case 1 without any gaps. Reference numeral 9 denotes a pot in which an annular step 10 is formed in the center of the peripheral wall, and the lower half has a smaller diameter than the upper half. By doing so, it is stored in the pot storage case 3. When this pot 9 is stored in the pot storage case 3, its bottom face faces the sheathed heater 5 with a predetermined gap, and the lower half of the pot 9 and the pot storage case 3 are arranged to face each other. A sealed space 11 for heating, in which the sheathed heater 5 is installed, is formed by the lower half of the sheathed heater 5 . On the other hand, 12 is a hinge member 1 attached to the outer case 1.
The inner cover 15 is attached to the inner surface of the outer cover via a heat insulating material layer 14 made of a heat insulating material. 16 is inner cover 1
The inner lid is removably attached to the pot 5, and its outer periphery is in contact with the curled portion 9a at the upper end of the pot 9. still,
The outer periphery of the inner cover 15 is close to the upper surface of the decorative frame 2, and the outer periphery of the heat insulating material 14 is placed opposite to cover the periphery of the upper end of the pot 9.

Next, the operation of this embodiment configured as above will be explained. Rice and water necessary for cooking the rice are put into the pot 9, and by pressing down a lever (not shown), the temperature-sensitive switch 7 is turned on, and the sheathed heater 5 is energized to generate heat. Then, the radiant heat from the sheathed heater 5 reaches the bottom of the pot 9 directly and reflected on the inner surface of the pot storage case 3, but at the same time, the pot storage case 3 itself and the air in the space 11 are also heated, and the air inside the space 11 is heated. The high temperature air rises near the stepped portion 10 due to convection. Since the step part 10 is in close contact with the placing step part 4, the heat received by the lower half of the pot storage case 3 from the sheathed heater 5 is transferred to the upper half of the pot 9 as shown by arrow a. Since the stepped portion 10 contacts the high-temperature air in the space 11, the heat received from the stepped portion 10 and the high-temperature air layer in the space 11 in the vicinity is transferred to the peripheral wall of the pot 9 and is transferred to the top of the pot 9. The rice in the pot 9 is heated and cooked evenly from the bottom and the surrounding wall of the pot 9.

As described above, according to this embodiment, the sheathed heater 5
The heat received by the pot storage case 3 is transferred from the mounting step 4 to the pot 9 via the step 10.
The heat transfer to the upper half of the pot storage case 3 is reduced accordingly, and the amount of heat radiated from the peripheral wall of the pot storage case 3 through the heat insulating material layer 8 can be reduced. Space part 1 that becomes temperature
The upper part of the pot 9 is sealed by the step 10 of the pot 9, and the thickness of the part of the heat insulating material layer 8 disposed around the outer periphery of the pot storage case 3 facing below the mounting step 4 is as follows. Since the thickness is set to be larger than the thickness of the part facing above the stage 4, heat is radiated from the lower half of the pot storage case 3 which is in contact with the space 11 and has a higher temperature than the upper half. By effectively preventing
Loss due to heat radiation from the pot storage case 3 can be prevented as much as possible, and the thermal efficiency of rice cooking can be greatly improved.Since heat is transferred to the peripheral wall of the pot 9 via the stepped portion 10, the entire area of the pot 9 is evenly distributed. The heating degree can be adjusted to a certain degree.

In this embodiment, since the heat insulating material 14 covers the outer periphery of the upper end of the pot 9, heat radiation loss can be further reduced.

As is clear from the embodiments described above, the present invention can significantly reduce heat radiation from the pot storage case to the surroundings, greatly improve thermal efficiency, and provide a rice cooker that can uniformly heat the entire pot.

[Brief explanation of drawings]

The drawing is a side view, partially in section, showing an embodiment of the present invention. In the drawing, 3 is a pot storage case, 4 is a mounting step, and 5 is a pot storage case.
8 is a sheathed heater, 8 is a heat insulating material layer, 9 is a pot, 10 is a step portion, and 11 is a space portion.

Claims (1)

[Claims] 1. A pan having an annular step formed in the middle part of the surrounding wall so that the lower half has a smaller diameter than the upper half, and a mounting step for placing the step of the pot on the surrounding wall, and A pot storage case forming a heating space surrounding the outer periphery of the pot below the mounting stage, a heater disposed within the space at a distance from the pot, and the pot storage case. and a heat insulating material layer that is provided to cover the outer periphery of the mounting stage and has a thickness at a portion facing the lower part of the mounting stage and greater than a thickness at a part facing the upper part of the mounting stage. A rice cooker.