JPS6326106Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a heat-sensitive device for a cooker.

A conventional heat-sensitive device for a cooker in which the inner pot is made detachable, the bottom of the pot is heated by a heater, and a heat-sensitive device is brought into elastic contact with the bottom of the pot to control the temperature of the food inside the inner pot is shown in Fig. 1, for example. As shown in a cross-sectional view of a heat-sensitive device for a cooking device showing a conventional example, a lid body 2 is fixed on a vessel body 1 so as to be openable and closable, and a bottomed body with an open upper end is provided inside the vessel body 1. An inner container 3 is fixed, a heater 4 is fixed to the inner bottom of the inner container, and a heat-sensitive device 5 is fixed so as to be able to protrude and retract from the surface of the heater 4, and a device directly below the inner container 3 is arranged to open and close according to the movement of the heat-sensitive device 5. A dry firing prevention switch 6 is fixed. Reference numeral 7 denotes an inner pot which is detachably housed from the upper end of the inner container 3 and is configured such that its bottom abuts against the heater 4 and the upper end of a heat sensitive device 5 comes into elastic contact to detect the temperature of the inner pot 7.

Next, FIG. 2 shows an embodiment of the heat-sensitive device 5 shown in FIG. It has several fixing parts 9, and after being inserted into a fixing hole 38 provided at the bottom of the inner container 3, the tips thereof are bent and fixed so as to be vertically slidable, and a connecting plate 10 is fixed to the central part. 11 is a presser plate;
Reference numeral 12 is a sensor cover molded from an aluminum plate or the like having good thermal conductivity, and its outer periphery is caulked and fixed to the thermocase 8 with the presser plate 11 in between. Reference numeral 13 denotes a heat-sensitive element, and 14 a heat-resistant cushion material, which is clamped and fixed between the presser plate 11 and the sensor cover 12. Reference numeral 15 denotes lead wires for transmitting electrical signals from the heat-sensitive element 13, which are connected to the heat-sensitive element 13 and an operating circuit (not shown), respectively. A compression spring 16 has one end in contact with the outer periphery of the sensor cover 12 and the other end in contact with the bottom surface of the inner container 3, thereby elastically contacting the sensor cover 12 of the heat sensitive device 5 with the bottom surface of the inner pot 7.

Due to the above configuration, the sensor cover 12
receives radiation and convection heat from the outer heater 4 which receives heat from the inner pot 7, and the presser plate 11 is also caulked and fixed to the thermo case 8, and also clamps and fixes the heat sensitive element 13 and the heat resistant cushion material 14, so it is heat resistant and mechanical. Metal materials with good thermal conductivity are often used from the viewpoint of physical strength, and are also easily affected by the heat of the heater 4, and furthermore, the heat received on the side of the thermo case 8 is conducted to the presser plate 11 and the sensor cover 12. Because of this, the overall insulation is poor and only the temperature of the inner pot 7 and bottom surface cannot be accurately detected by the heat sensitive element 13.
In particular, when a foreign object is present between the inner pot 7 and the heater 4 and sufficient heat is not conducted to the inner pot 7, the temperature of the heater 4 rises, causing a significant thermal effect and resulting in extremely inaccurate detection. There were other drawbacks.

The present invention solves the above-mentioned drawbacks, and uses a heat-sensitive device for a cooker that removably stores an inner pot and is in elastic contact with the bottom of the inner pot, which has a heater inside. A sensor unit is constructed by fixing a thermocase to the bottom of the container, and comprising a thermobase, a heat-sensitive element, and a sensor cover covering it within the thermocase, and a compression spring interposed between the thermobase and the bottom of the container. The present invention provides a heat-sensitive device for a cooking appliance in which the sensor unit is provided with a sensor unit that can be freely retracted from the thermocase.

The structure of the present invention will be explained with reference to FIGS. 3 and 4 showing one embodiment.

17 is a thermo case formed from a heat-resistant metal plate, and has a cylindrical shape with an opening 18 at the center of the upper end, and an appropriate number of fixing parts 19 at arbitrary positions at the lower end.
20 are provided at the top and bottom, respectively. Reference numeral 21 is a thermo cover which covers the lower end opening of the thermo case 17 and is fixed inside the thermo case 17 by bending the fixing part 19 inward as shown in the figure.
After inserting the thermo case 17 into an appropriate number of fixing holes 38 provided in the inner container 3, bend it inward as shown in the figure and fix the thermo case 17 to the inner container 3. 36 and is fixed thereto. 22
The thermobase is slidably inscribed in the thermocase 17 and is made of a material such as a silicone resin glass laminate that has a low thermal mass and has good heat resistance and heat insulation properties.
Reference numeral 23 denotes a connecting plate that connects the thermobase 22 at the center and has material properties similar to the thermobase 22. 24 is a sensor cover made of a highly thermally conductive material such as aluminum, and its outer diameter is the opening 1 of the thermo case 17.
It has a cylindrical shape with a lower end opening sufficiently smaller than 8, and the lower end is fixed to the thermobase 22. Reference numeral 25 denotes a heat-sensitive element, and 26 indicates a heat-resistant packing with good heat insulation properties, which is placed on the upper end of the connecting plate 23, so that the heat-sensitive element 25 is brought into close contact with the sensor cover 24, and has an insulating effect that suppresses the influence of heat from below. . Reference numeral 27 denotes lead wires for transmitting electric signals of the heat-sensitive element 25, which are connected to the heat-sensitive element 25 and an operating circuit (not shown), respectively.
8. 29 is a compression spring, the upper end is the thermo base 22, and the lower end is the sensor cover 21.
The sensor unit 28 is in contact with the sensor unit 28 and is attached so as to constantly push the sensor unit 28 upward. Further, parts from the thermo case 17 to the compression spring 29 constitute a heat sensitive unit 30.

The operation of the above configuration will be explained.

When the inner pot 7 is placed on the bottom of the vessel 1 as shown in Fig. 3, the sensor unit 28 of the heat sensitive unit 30 is lowered, the switch 6 is turned on, and the heater 4 is energized and the thermostat is heated by radiation and convection heat from the heater 4. The case 17 is heated, but since the opening 18 at the upper end of the thermo case 17 is sufficiently larger than the outer diameter of the sensor cover 24, a heat insulating layer of air is formed between the two, and the thermo case 17 is heated. Since the base 22 also needs to slide up and down, some clearance is provided between them, so the contact area is extremely small, so that the heat is transferred from the thermo case 17 receiving the heat to the sensor cover 24 in which the heat sensitive element 25 is installed. The heat sensitive element 25 receives only the heat from the bottom of the inner pot 7 without any thermal influence, and the temperature of the inner pot 7 can be accurately detected.

Next, as shown in FIG. 4, when the inner pot 7 is removed, the elastic force of the compression spring 29 in the heat sensitive unit 30 pushes the thermo base 22, so that the sensor unit 28 consisting of the sensor cover 24 and the like in which the heat sensitive element 25 is installed is heated. The dry firing prevention switch 6, which is protruded from the case 17 and connected to the connecting plate 23 provided at the bottom of the sensor unit 28, is turned off, and the energization of the heater 4 provided at the bottom of the container body 1 is stopped.

As mentioned above, the present invention is a heat-sensitive device for a cooking device that removably stores an inner pot and is in elastic contact with the bottom of the inner pot in which a heater is installed. fixed at the bottom,
A sensor unit consisting of a thermobase, a heat-sensitive element, and a sensor cover covering it is provided in the thermocase, and a compression spring is interposed between the thermobase and the bottom of the body, and the sensor unit is retractable from the thermocase. By making the heater freely adjustable, when the heater is energized, radiation and convection heat from the heater are blocked by the thermocase, and the sensor unit consisting of the thermobase, heat-sensitive element, sensor cover, etc., which is retractably installed inside the thermocase, acts as a heater. Only the temperature of the inner pot can be accurately sensed by the heat-sensitive element of the sensor unit without being affected by the heat of This method is advantageous in that very accurate temperature detection can be obtained without being affected by the temperature rise of the heater.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of a cooking device showing a conventional example, Fig. 2 is a sectional view of a main part of a heat-sensitive device of a cooking device showing a conventional example, and Figs. FIG. 2 is a cross-sectional view of a main part of a heat-sensitive device of a cooking appliance showing an example. 1... vessel body, 4... heater, 7... inner pot, 1
7...Thermo case, 22...Thermo base, 2
4... Sensor cover, 25... Heat sensitive element, 28
...Sensor unit, 29...Compression spring.

Claims (1)

[Scope of utility model registration request] The inner pot 7 is removably stored, and the heater 4 is
In a heat-sensitive device for a cooker, which is in elastic contact with the bottom surface of the inner pot 7 at the bottom of the container 1, a cylindrical thermo case 17 with an open top end is fixed to the bottom of the container 1, and the thermo case 17 has a thermosensor inside. A sensor unit 28 is provided, which is composed of a base 22, a thermosensitive element 25, and a sensor cover 24 covering it, with a compression spring 29 interposed between the thermobase 22 and the bottom of the body 1.
A heat-sensitive device for a cooker, characterized in that a thermosensitive device 8 can freely appear and retract from a thermocase 17.