JPS6334727B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a temperature control device for heat-retaining appliances such as electronic jars and electronic jar rice cookers.

Conventional structure and its problems Traditionally, electronic jar rice cookers are kept warm by a heat-retaining heater wrapped around the outer surface of the inner frame, a rice-cooking heater attached to the bottom of the inner frame, and a lid heater attached to the inside of the outer lid. This was done by generating heat and keeping the rice inside the pot at a constant temperature of around 70°C. In order to maintain this constant temperature, a temperature-sensitive switch was attached to the outer surface of the inner frame to indirectly sense and control the temperature inside the pot.

As one configuration of the heat retention method, a heat retention heater is wrapped around the outer surface of the inner frame, a rice cooking heater is attached to the lower part of the inner frame, a lid heater is attached to the outer lid, and the temperature retention heater is wrapped around the outer surface of the inner frame. There is also a device in which a temperature-sensitive switch mounting base is fixed to the lower part, and the temperature-sensitive switch is attached to the temperature-sensitive switch mounting base with screws or the like. According to this configuration, the temperature of the cooked rice in the pot is indirectly sensed by the temperature-sensitive switch, and when the temperature of the cooked rice in the pot drops, the three heaters are energized to raise the temperature of the cooked rice in the pot to 70°C. When the temperature reaches a certain level, the power is turned off. In this case, the pot has a degree of freedom in the horizontal direction corresponding to the gap with the inner frame, and the pot may or may not come into contact with the temperature-sensitive switch mounting portion of the inner frame. In the former case, much of the heat from the temperature-sensitive switch attachment part of the inner frame is absorbed by the pot, so the amount of heat transmitted to the temperature-sensitive switch decreases and the heat retention temperature tends to increase. In the latter case, the trend is opposite to that described above. As a result, the heat retention temperature differs depending on the positional relationship between the inner frame and the pot.

On the other hand, in order to prevent the temperature-sensitive switch mounting part of the inner frame from coming into contact with the pot, some resin rivets are attached separately to form a protruding part on the inner surface of the inner frame, but this increases the number of parts and man-hours. Not only is this a high-cost product, but it also requires a fixing area to be provided at the temperature-sensitive switch mounting portion on the outer surface of the inner frame, resulting in many design difficulties.

OBJECT OF THE INVENTION The present invention has been made in view of the conventional drawbacks.
The present invention aims to provide a temperature control device for a heat-retaining appliance that regulates contact between an inner frame and a pot, and is low-cost and advantageous in terms of design.

Structure of the Invention In order to achieve the above object, the present invention provides that when a mounting base for mounting a temperature-sensitive switch for detecting a heat retention temperature is fixed to an inner frame, the head part is fixed using a rivet coated with a resin, and The head of the pot is made to protrude from the inner surface of the inner frame so that the inner frame and the pot are not in contact with each other in terms of heat transfer.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention applied to an electronic jar rice cooker will be described with reference to the accompanying drawings.

In Fig. 1, 1 is a cylindrical outer frame, 2 is an outer frame 1
A cylindrical inner frame formed by drawing a thin metal plate equipped inside, 3 a rice cooking heater equipped at the inner bottom of the inner frame 2, 4
5 is a pot that is removably placed on the rice cooking heater 3;
is an outer lid with a heat-insulating structure, 6 is an inner lid that covers the upper opening of the pot 4, 7 is a lid heater installed in the outer lid 5, 8 is a caulking metal fitting fixed to the outer surface of the inner frame 2, Reference numeral 9 denotes a heat-retaining heater wrapped around the outer surface of the inner frame 2 and attached by caulking with a caulking fitting 8;
is a caulking rivet whose head is coated with resin; 11 is a temperature-sensitive switch mounting base fixed to the outer surface of the inner frame 2 by a caulking rivet 10; 12 is a temperature-sensitive switch screwed to the temperature-sensitive switch mounting base 11;
13 is a switch that starts the rice cooking operation, and 14 is a magnetic thermostat that detects the temperature at the bottom of the pot and completes the rice cooking operation.

The rice cooking and warming method according to this configuration will be explained with reference to FIG. 2.

When the rice cooking start switch 13 is operated, the rice cooking heater 3 is energized and starts generating heat. The rice placed in the pot 4 is heated by the rice cooking heater 3 and cooking is started. Then, in the latter half of cooking, the magnetic thermostat 14 is activated by detecting the temperature at the bottom of the pot, and switch 1 is activated.
Cooking rice is completed by operating 3. At this time, heat retention heater 9, lid heater 7, rice cooking heater 3
A heat retention circuit is configured and heat retention is started. Immediately after rice cooking is completed, the temperature of the rice in the pot is close to 100°C, so the temperature-sensitive switch 12 is turned off. After that, the temperature of the cooked rice in the pot gradually decreased to 70℃.
When the temperature is around the same temperature, the temperature-sensitive switch 12 is turned on.
Then, energization of the heat insulation circuit starts. after that,
The temperature-sensitive switch 12 is repeatedly turned ON and OFF to maintain the temperature of the cooked rice in the pot at a constant temperature of around 70°C.

As described above, according to the embodiment of the present invention, the rivet 10 for fixing the temperature-sensitive switch mounting base 11 to the inner frame 2 is provided without direct contact between the temperature-sensitive switch mounting base 11 of the pot 4 and the inner frame 2. The resin-coated head protrudes from the inner surface of the inner frame 2 to restrict contact between the inner frame 2 and the pot 4, so no matter where the pot 4 is in the inner frame 2, the temperature-sensitive switch is activated. 12 is inner frame 2
The amount of heat received by the two cookers is approximately the same, and therefore the temperature of the cooked rice in the pot 4 remains constant. Furthermore, in the past, the temperature-sensitive switch mounting base 11 was fixed by spot welding or the like, which was a problem in automated lines, but according to the embodiment of the present invention, it is fixed by caulking with rivets 10. Easier to automate. On the other hand, the resin rivets that were conventionally attached to regulate the position of the pot are no longer required, and the number of parts and man-hours are both reduced, making it possible to significantly reduce costs.

Effects of the Invention As is clear from the description of the embodiments described above, according to the present invention, when fixing the mounting base for mounting the temperature-sensitive switch for detecting the heat retention temperature to the inner frame, the head part is fixed using a rivet coated with resin. In addition, the resin-coated head is made to protrude from the inner surface of the inner frame so that the inner frame and the pot are not in contact with each other in terms of heat transfer. When fixing the mounting base to the inner frame using metal rivets, the heat from the pot will be transmitted to the inner frame and the temperature-sensitive switch mounting base via the metal rivets. When a heat transfer route is formed, a temperature-specific part will be created at the temperature-sensitive switch mounting part of the inner frame. However, in the present invention, the head of the rivet is coated with a resin, and Since the inner pot protrudes from the inner surface of the inner frame so that heat does not come into contact with the inner pot in terms of heat transfer, heat transfer from the pot to the inner frame via the rivets is greatly reduced. As a result,
Since there will no longer be any temperature-specific areas at the temperature-sensitive switch mounting part of the inner frame, the amount of heat that the temperature-sensitive switch receives from the inner frame will be approximately the same no matter what condition the pot is placed in the inner frame. Therefore, the temperature-sensitive switch mounting portion of the inner frame can always be kept under constant temperature conditions. In addition, in terms of the structure, the desired purpose can be achieved by simply making some improvements to the work of fixing the mounting base on which the temperature-sensitive switch is attached to the inner frame, so a very large effect can be obtained with almost no increase in cost. be.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part of an electronic jar rice cooker showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the same, Fig. 3 is a plan view of the main part, and Fig. 4 is a front view of the main part. It is a diagram. 1... Outer frame, 2... Inner frame, 4... Pot, 10...
Rivet, 11...Temperature switch mounting base, 12...
...Temperature-sensitive switch.

Claims (1)

[Claims] 1. A main body consisting of an outer frame and an inner frame built into the outer frame, a pot stored in the main body, an outer lid that is pivotally supported at the upper end of one side of the main body and covers the upper opening of the main body, and Equipped with a heat-retaining heater wrapped around the outer surface of the inner frame, a mounting base for mounting a temperature-sensitive switch for detecting the heat-retaining temperature on the outer surface of the inner frame, and a temperature-sensitive switch.
When fixing the mounting base to the inner frame, the head is fixed using a rivet coated with resin, and the resin-coated head is made to protrude from the inner surface of the inner frame so that the inner frame and the pot are connected in a heat transfer manner. Temperature control device for thermal insulation equipment that is non-contact.