JPH0433827Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a heat-sensitive device for controlling cooking temperature in an electric cooking device such as an electric rice cooker.

Conventional technology Conventionally, this type of heat-sensitive device has been developed by patent application No. 57-39804.
It is structured as in the Publication No. This is because, as shown in Fig. 4, a heat shield cylinder 3 is provided for the purpose of suppressing the conduction of radiant heat from the heater 1 to the heat sensitive plate 2, but the spring 4 that presses the heat sensitive plate 2 against the bottom of the pot is Unless the spring force of the spring 5 that presses the heat shield tube 3 against the pot bottom is considerably stronger than the spring force, the heat shield tube 3 will be pushed down by the spring 4 and will not come into contact with the pot bottom. Therefore, in the heat-sensitive device, the total spring force that presses the entire device against the bottom of the pot is very large.

Problems that the invention aims to solve In such a conventional configuration, the total spring force that presses the entire heat-sensitive device against the bottom of the pot is very large, so a relatively lightweight pot such as an electric stove is used. When considering the application to a cooking appliance, there is a problem that the pot is pushed up by the spring force and floats, and the bottom of the pot does not stably contact the hot plate on which the heater 1 is installed. This configuration has the problem of requiring a large number of assembly steps.

An object of the present invention is to provide a heat-sensitive device that is easy to assemble and does not cause the heated object to float due to spring force when a lightweight heated object is placed thereon.

Means for Solving the Problems The heat-sensitive device of the present invention includes a heat-sensitive plate that encloses a heat-sensitive element and has an engaging protrusion on its outer periphery.The outer peripheral edge of the heat-sensitive plate has a cylindrical shape, and the upper end engages with the engaging protrusion in the inner diameter direction. A heat insulating tube having a flange formed thereon is placed on top of the heat insulating tube, and the heat insulating tube is housed in a bottomed cylindrical outer case, and between the bottom of the outer case and the heat insulating tube and between the bottom of the outer case and the heat sensitive plate. first and second compression springs are respectively interposed in the outer case, and the claws on the side surfaces of the outer case are bent inward and engaged with the outer periphery of the lower end of the heat shield cylinder, thereby regulating the amount of upward movement of the heat shield cylinder. It is characterized by what it did.

Function According to this configuration, the heat shield cylinder is urged upward by the first compression spring against the outer case, and the heat sensitive plate is urged upward by the second compression spring against the outer case. The amount of upward movement of the heat shield tube is regulated by engagement with a claw bent inside the side surface of the outer case, and the amount of upward movement of the heat sensitive plate is regulated by the engaging protrusion that engages with the collar of the heat shield tube. is regulated.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows a thermosensitive device of the present invention. 6 is a hot plate made of cast aluminum, into which a sheathed heater 7 is cast. 8 is a heat-sensitive plate containing a thermistor 9 as a heat-sensitive element, and the thermistor 9 is pressed against the heat-sensitive plate 8 by inserting an elastic heat-resistant insulating molded body 11 between the sensor holding plate 10 and the heat-sensitive plate 8. . Reference numeral 12 denotes an insulating plate interposed between the thermistor 9 and the heat-sensitive plate 8. 13 is a sensor case. Here, the sensor case 13, the heat-sensitive plate 8, and the sensor holding plate 10 are the heat-sensitive plate 8.
It is fixed by caulking the outer peripheral edge of. 14 is a heat shield cylinder, and a flange 15 is provided at the upper end in the inner diameter direction.
is formed, and this collar 15 engages with the outer peripheral edge of the heat-sensitive plate 8. Reference numeral 16 denotes a cylindrical outer case with a bottom, and claws 17 and 18 of different shapes are formed on the side surfaces at three equally spaced locations. By bending it, the heat shield tube 14 is locked so that it does not slip out from the outer case 16. 19 is a first compression spring that urges the heat shield tube 14 upward; 20 is a second compression spring that biases the heat sensitive plate 8 upward; these springs 19 and 20 cause the heat sensitive plate 8 and the heat shield tube 14 to will each come into contact with the bottom of the pot.

Briefly describing the assembly procedure, the thermistor 9, heat-resistant edge molded body 11, center presser plate 10, and sensor case 13 are integrally constructed by caulking the outer peripheral edge of the heat-sensitive plate 8. At the outer periphery, a second
Insert the compression spring force 20 into the outer case 1.
6 and then the first compression spring force 19
Put the heat shield tube 14 into the outer case 16, press down until the heat shield tube 14 comes into contact with the bottom of the outer case 16, and then press the claw 1 formed on the side surface of the outer case 16.
When 7 is bent inward, the lower edge of the heat shield tube 14 will be caught by the claws 17, and the assembly as a heat sensitive device will be completed.

Note that by configuring the step dimension b of the heat sensitive plate 8 to be larger than the stroke dimension a in which the heat sensitive plate 8 can be pushed down, the heat sensitive plate 8 is always aligned with the heat shield cylinder 14.
It is held in a state where it protrudes from the center of the. Figure 2 shows the external appearance.

With the above configuration, when the pot on the hot plate 6 is placed, the heat sensitive plate 8 first comes into contact with the bottom of the pot, and when the heat sensitive plate 8 is pushed down a little against the second compression spring 20, then The heat shield tube 14 comes into contact with the heat shield tube 14, and the heat shield tube 14 is also pushed down against the first compression spring 19 until the bottom of the pan comes into contact with the hot plate 6.

Effects of the Invention As is clear from the above explanation, in the heat-sensitive device of the present invention, the heat-sensitive plate and the heat-shielding cylinder that come into contact with the object to be heated are biased upward by independent first and second compression springs. The spring force that presses and biases the heat shield cylinder can also be set to a small value, eliminating the possibility that the spring will push up a lightweight object to be heated and the object to be heated will be unstablely placed on the hot plate. Improves thermal efficiency and usability. Furthermore, the heat shield cylinder blocks the hot air from the hot plate even for a hollow pot, preventing the thermistor from malfunctioning due to direct contact with the hot air from the heat sensitive plate, allowing accurate temperature control.

As for the workability of assembling the heat-sensitive device, the assembly can be completed by simply bending the claws on the side of the outer case inward, and the number of assembly steps can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the heat-sensitive device of the present invention, FIG. 2 is a perspective view of the main body of the cooking device of the present invention, FIG. 3 is a front view of the outer case of the heat-sensitive device in FIG. 1, and FIG. The figure is a longitudinal sectional view of a conventional example. 6... Heat plate, 7... Sheathed heater, 8... Heat sensitive plate, 9... Thermistor (heat sensitive element), 10... Sensor holding plate, 13... Sensor case, 14...
... Heat shield cylinder, 15 ... Tsuba, 16 ... Outer case, 17
...Claw, 19...First compression spring, 20...Second
compression spring, 21...engaging protrusion.

Claims (1)

[Scope of utility model registration request] A heat shielding cylinder having a cylindrical shape and having a flange formed at the upper end that engages with the engagement protrusion in the inner radial direction is placed on the outer peripheral edge of the heat-sensitive plate that encloses the heat-sensitive element and has an engagement protrusion on the outer circumference; Place the heat shield cylinder in a bottomed cylindrical outer case,
First and second compression springs are interposed between the bottom of the outer case and the heat shield cylinder and between the bottom of the outer case and the heat sensitive plate, respectively, and the claws on the side surfaces of the outer case are bent inward to provide the shield. A heat-sensitive device for an electric cooker that engages with the outer peripheral edge of the lower end of a heat shield cylinder to restrict the amount of upward movement of the heat shield cylinder.