JPH02239818A - Thermosensor for cooker - Google Patents

Abstract

PURPOSE:To fuse a temperature fuse and enhance safety when an electronic control unit or thermosensitive unit is at fault and the temperature of a plate continuously rises by fixing the temperature fuse just under the thermosensitive element and unifying these element. CONSTITUTION:For a thermosensitive unit 8 fixed slidably upward and downward in a main body 1 bottom central part, a flange 10a is provided at the lower edge of a cylindrical thermosensitive cylinder 10 whose lower side is opened, and the space between the thermoplastic element 12 and a control unit 8 is connected by a lead wire 14. The space between the thermosensitive element 12 and a temperature fuse 16 is electrically insulated by an insulating plate 15, and the temperature fuse 16 is fixed in contact with the insulating plate 15. The space between the temperature fuse 16 and an electronic control unit 8 is connected to a lead wire 17 to execute the connection. A spring 19 always presses the thermosensitive unit 9 upward and springingly contacts the thermosensitive cylinder 10 stably to a plate 2 to be subject equipped with a heater 2a in a bottom surface part. Thus, when the electronic control unit 8 or thermosensitive unit 9 is made into trouble, the heater 2a is not controlled, the heating is continues and the plate 2 is made into an abnormally high temperature, the temperature fuse 16 is disconnected, and the energizing is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat-sensitive device for an electric cooker used in general households. (Prior Art) A conventional cooking device will be explained with reference to FIGS. 4 and 5.

In order to sense and control the temperature of the plate 2, a heat-sensitive unit 9 is placed in elastic contact with the center of the bottom of the plate 2, and inside the heat-sensitive unit 9 there is a heat-sensitive element 1 on the upper surface of the heat-sensitive cylinder 10, as shown in FIG.
2 is fixed, and the electric signal of the heat sensitive element 12 accompanying the temperature change is connected to the electronic control unit 8 through the lead wire 14, and the electronic control unit 8 controls the output of the heater 28. ，
As a safety device for dealing with a failure of the control device of the thermal unit 9, a thermal fuse was generally provided in the control component storage portion 1a.

(Problem to be solved by the invention) In recent years, the electric power situation has changed to 200 V, making it possible to use electric cookers with a large heating power. However, the thermal fuse device described above has poor thermal sensitivity, so the sudden increase in plate 2 Unable to detect temperature rise. Even if there were no fire accidents, the equipment was often severely damaged and could not be reused.

The purpose of the present invention is to solve these problems and provide a product that is more practical and safer.

(Means for Solving the Problems) In the present invention, a thermal fuse is fixed directly under a heat-sensitive element, and the two are integrated.

(Function) If the electronic control unit or thermal unit fails, the temperature of the plate will continue to rise and the temperature will increase. (Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1.2.3.

Reference numeral 1 is a bottomed body with an open top, and a control parts storage part 1g is provided in a part of the side surface, and a lead wire hole 1b is provided in the center of the bottom surface. Reference numeral 2 denotes a bottomed plate with an open top, and a heater 2a is provided at the bottom of the plate, which can be detachably fixed on the main body 1. Reference numeral 3 denotes a reflecting plate fixed to the bottom of the plate 2 so as to cover almost the entire surface thereof, and a reflecting tube 3a for shielding heat from the heat-sensitive unit 9 is provided in the center. 4 connects reflector 3 to plate 2
The mounting screws 6 are fixed to the reflector plate 3 and function to hold the plate 2 on the body 1. A heat shield plate 6 is fixed to cover almost the entire inner bottom surface of the main body 1, and a holding hole 6a is provided in the center thereof.

Reference numeral 7 indicates a mounting screw fixing the heat shield plate 6 to the main body 1, 8 indicates an electronic control unit provided in the control parts storage section 1a, and 9 indicates
The thermosensitive unit is fixed to the center of the bottom of the main body 1 so as to be slidable up and down, and its configuration is as follows.

Reference numeral 10 denotes a cylindrical heat-sensitive tube that is open at the bottom, and a flange 10afa0: is provided at the lower end. 11 is a heat collection block that sensitively collects heat from plate 2, and 12 is the same block 1.
1 is a heat-sensitive element fixed inside the heat-sensitive element 1, and 13 is an insulating tube for electrically insulating the surroundings of the heat-sensitive element 12. 14 is a lead wire that connects the heat-sensitive element 12 and the electronic control unit 8; 16 is an insulating plate that performs electrical insulation and appropriate thermal insulation functions between the heat-sensitive element 12 and the thermal fuse 16. 16 is a thermal fuse and insulation board 1
6 and is fixed. 17 is a thermal fuse 16
A lead wire 18 is a fuse holder that connects the electronic control unit 8 and the thermal fuse 16, and also connects the lead wires 14 and 1 from the thermal cord 12 and the thermal fuse 16.
Lead hole 1 that holds both parts compactly without contacting 7.
8a and 18b are provided. 19 is the thermal unit 9
This is a spring that constantly pushes the thermosensitive cylinder 10 upwardly and brings the thermosensitive tube 10 into stable elastic contact with the plate 2.

It consists of the above-mentioned elements, and its operation will be explained next. 6P First, during normal operation as a product, the plate 2 is placed on the main body 1, and the heat-sensitive element 12 of the heat-sensitive unit 9 that is in elastic contact with the plate 2 senses the temperature rise of the plate 2 due to heating by the heater 2a.
The electric signal is processed by the electronic control unit 8, and the output of the heater 2a is controlled so that the temperature of the plate 2 is constant. At this time, the thermal fuse 16 is kept at a temperature sufficiently lower than the operating temperature due to the heat shielding effect of the reflector tube 3a, the insulating plate 16, etc.
If the electronic control unit 8 or the thermal unit 9 malfunctions for some reason, the heater 2a will continue to heat without being controlled, and as a result, the plate 2 will reach an abnormally high temperature, which in the worst case may even cause a fire. In this case, although the thermal fuse 16 passes through a buffer material called the insulating plate 16, it directly receives the conductive heat from the plate 2, so it is extremely sensitive to heat and turns off the current, minimizing damage to the device body. It can be kept to a minimum.

(Effects of the Invention) The present invention has the following effects. Since the thermal fuse is installed near the thermal element (closest to the second OP from the plate that is the heat source), the thermal fuse can always capture a temperature slightly lower than the temperature of the thermal element, which most accurately captures the control temperature during normal use. This makes it possible to accurately detect temperature rises caused by abnormal heating due to failure of the electronic control unit or heat-sensitive element earlier than other parts.As a result, damage to the instrument body is minimized, making it an excellent safety device. I can demonstrate it. In addition, if an abnormal condition occurs where the thermal fuse operates, the thermal element will be seriously damaged, so in many cases both are replaced at the same time. However, since both are housed in one place as a thermal unit, only the thermal unit must be disassembled and replaced. It can be easily repaired since it only needs to be assembled.

[Brief explanation of drawings]

FIG. 1 is an overall sectional view of a cooking device showing one embodiment of the present invention.
Figure 2 is a sectional view of the main part of Figure 1, Figure 3 is a sectional view of the main part when the viewpoint of Figure 2 is rotated approximately 90 degrees, and Figures 4 and 6 are examples of conventional cooking appliances. A sectional view of the main parts shown is shown. DESCRIPTION OF SYMBOLS 1... Main body, 2... Plate, 9... Heat sensitive unit, 7 P 12... Heat sensitive element, 16... Temperature fuse.

Claims (1)

[Claims] A heat-sensitive element (12) is provided on the inner upper surface of the heat-sensitive cylinder (10), and a thermal fuse (16) is provided directly below the heat-sensitive element (12) to form a heat-sensitive unit (9), and the outer upper surface of the heat-sensitive cylinder (10) is covered. A heat-sensitive device for a cooker characterized by being in elastic contact with the surface of a sensing object.