JPS6360665B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rice cooking sheet that is used to provide cooked rice without burning by being placed on the bottom of a commercial rice cooker.

Conventional structure and its problems Traditionally, after cooking rice, the presence of burnt spots on the bottom of the pot was essential for delicious cooking, but commercial rice cookers have commercial restrictions. Since there is a strong desire for a rice cooker that does not cause burns, we were forced to use what is called a rice cooking sheet. The rice cooking sheets are mainly made of aluminum plates and Teflon glass sheets. In the case of an aluminum plate, if the bottom of the pot and the aluminum plate are not in close contact, mutual heat conduction and convection will not be sufficient and the rice will likely be unevenly cooked, so careful consideration must be given to processing accuracy and handling. Therefore, it was difficult to use it practically in equipment that is frequently used for business purposes. In the case of Teflon glass sheets or Teflon sheets, the rice will be cooked just as well as when there is no rice cooker sheet, but they are expensive and have less durability, such as tears or cuts. There were some shortcomings. Also, what is common to both is that when used for business purposes, rice cooking sheets are often used without washing due to busy schedules, and in this case, rice grains are left in the holes in the rice cooking sheets. It sticks to me. Because the rice cooking sheet is a part that is placed on the bottom of the pot, and because the heat source is located below the bottom of the pot, heat convection moves upward from the bottom of the pot, so it is usually made with many holes of several millimeters in size. However, if you use the pot with rice grains stuck to the holes, a lot of convection will occur between the bottom of the pot and the rice cooking sheet, and the important convection to the rice grains will be insufficient, resulting in rice particles near the center of the outer bottom of the pot. There was a problem that the temperature detection ability of the thermostat that was in contact with the rice cooker was reduced, making it easier for the rice to be cooked unevenly.

Purpose of the Invention The present invention was devised in view of the above circumstances, and provides rice that does not burn and can be cooked continuously using a sheet without any problems.

Structure of the Invention The rice cooking sheet of the present invention is laid on the inner bottom of a rice cooker pot, and has a thickness of 0.3 mm with a through hole in the center having a size of 3 to 6 mm and a through hole in the peripheral area having a size of 1.5 to 3 mm.
It is made of ~1.0mm silicone rubber.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a cylindrical outer case, 2 is an inner case, and the upper end opening has an edge projecting in the outer circumferential direction. Reference numeral 3 is a pot having a flange portion with the upper end of the opening protruding outward, and 4 is a lid having a knob 5 placed on the flange portion of the pot 3 and closed. Reference numeral 6 denotes a bottom plate having support legs 7, which are fitted and fixed to the lower end of the outer case 1. A reflector 8 is placed on the inner surface of the bottom of the inner case 2, and is fixed to the bottom of the inner case 2 at the same time as the heater stand 9 is fixed.
Three sheathed heaters 10 are placed on the heater stand 9. A heat-sensitive device 11 is disposed at the center of the bottom of the pot 3 to sense the pot temperature and control rice cooking. 1
2 is a lever that transmits the rice cooking control special feature of the heat sensitive device 11 to the micro switch 13;
It is attached to an operation plate 14 fixed to the frame and is rotatably attached by a bearing in the frame. 15 is a lever knob for starting rice cooking.

Next, the operation of this embodiment configured as described above will be explained.

A rice cooking sheet 16 is spread on the inner bottom of the pot 3, and washed rice and a predetermined amount of water are stored in the pot 3. When the lever knob 15 is lowered to start energizing, the sheathed heater 10 generates heat and heats the pot 3. As the pot heats up, the temperature inside the pot rises and the rice begins to absorb water, and after a predetermined period of time, the water in the pot 3 runs out, and when the temperature at the bottom of the pot 3 suddenly rises, the heat-sensitive device 11 that is in close contact with the bottom of the pot 3 The temperature also rises rapidly, and the operation of the heat-sensitive device 11 quickly cuts off the current, and the heat generation of the sheathed heater 10 is also stopped. However, the sheathed heater 1
0 has a large heat capacity, so even if the power is cut off and the heat generation is stopped, the temperature will remain at several hundred degrees or more, and the pot 3
Since the temperature at the inner bottom of the container is over 140℃, scorching can be seen. However, rice cooking sheet 1
6 is placed at the inner bottom of the pot, scorching occurs only in the eluted sticky part that exists on the surface sandwiched between the inner bottom of the pot 3 and the rice cooking sheet 16, and there is no burnt material between the rice cooking sheet 16 and the rice. No charring is visible.

Now, the rice cooking sheet 16 is provided with a large number of through holes in order to efficiently transmit heat convection from the bottom of the pot 3 to the rice, but when cooking rice continuously, the rice is inserted into the through holes of the rice cooking sheet 16. Rice may be cooked with grains stuck to it. In this case, the heat convection between the rice cooking sheet 16, which is in close contact with the inner bottom of the pot 3, and the inner bottom of the pot 3 is clogged with rice grains, resulting in a decrease in efficiency. The stability of temperature sensing of the heat sensitive device 11 and the outer bottom of the pot 3 tends to decrease. In other words, the operating temperature of the heat-sensitive device, which detects the temperature at which the rice is cooked and cuts off electricity, tends to vary. Therefore, rice is likely to be cooked unevenly, and using it for commercial purposes will be a hindrance to business. To explain the operation when using the rice cooking sheet 16 of the present invention, since the through holes around the center of the rice cooking sheet 16 are larger than other through holes, the heat between the rice cooking sheet 16 and the pot 3 is Convection is sufficient near the center of the rice cooking sheet 16, and even if it is clogged with rice grains, there are holes that are larger than the rice grains, so there is not much difference in heat convection between the periphery and the center. There is no occurrence of uneven cooking etc. during cooking. In addition, since a heat-sensitive device is attached to the center of the outside bottom of the pot 3, the thermal energy from the heater 10 is distributed at a large distance from the heater 10, and at the same time, due to the structure of being cooled by the heat-sensitive device, the heat energy is transferred to the center of the pot 3. However, if the hole near the center of the rice-cooking sheet 16 is made larger, the heat convection between the center of the inside bottom of the pot 3 and the rice-cooking sheet 16 will increase, and the heat convection will be distributed throughout the pot 3. Uniformity can be achieved and the rice will come out better.

Therefore, by increasing the size of the through-hole in the center of the rice cooking sheet 16, continuous rice cooking becomes possible, uneven cooking of rice is eliminated, and the finished product, especially in the center of the pot, is improved.

Since the rice cooking sheet 16 is made of silicone rubber, it has elasticity, fits well with the pot 3, is inexpensive, and poses no problem in terms of food hygiene.

Next, according to our experiments, the dimensions of the rice cooking sheet 16 are: hole pitch a = 5 to 15 mm, central through hole b = 3 to 6 mm, and diameter d of the area where the central through hole is open = heat-sensitive device. 11×f However, it is best if f=1 to 3, peripheral through hole c=1.5 to 3 mm, and thickness e=0.3 to 1.0 mm.

When this condition is satisfied, there will be no burning or uneven cooking during cooking, resulting in good results. Thickness is 0.3mm
The following disadvantages are that they cause charring, become too thin for use, and are difficult to handle. When the thickness is 1.0 mm or more, heat transfer from the pot 3 is poor, resulting in poor rice quality and uneven cooking. If the hole pitch a is large or
If the through holes are small and sluggish, heat transfer will be poor and the same phenomenon as above will occur. Furthermore, if the hole pitch a is too small or the through hole is too large, the strength will decrease and scorching will occur.

Effects of the Invention As is clear from the above explanation, the rice cooking sheet of the present invention has a particularly large through hole in the center, so that when it is provided at the bottom of a rice cooker pot for cooking rice, it maintains the performance of the rice cooker and maintains the performance of the rice cooker. It is possible to provide rice that is not evenly browned or evenly browned, and it is also possible to improve work efficiency in businesses that continuously cook rice.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a rice cooker equipped with a rice-cooking sheet showing an embodiment of the present invention, FIG. 2 is a perspective view of the rice-cooking sheet, and FIG. 3 is a perspective view of essential parts of the rice-cooking sheet. 3... Pot, 16... Rice cooking sheet.

Claims (1)

[Claims] 1 Made of silicone rubber, the central through hole is larger than the peripheral through hole, and the thickness is 0.3 to 1.0 mm.
A rice cooking sheet.