JPH0755474Y2 - Temperature sensor for cooker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a temperature sensor used for controlling the temperature of a cooking device such as a rice cooker, and in particular, a cooking device that maintains a constant cooking temperature.

[Conventional technology]

The conventional temperature sensor for a cooking device generally includes an outer case and an inner case that is supported by a spring from the bottom of the outer case so that the inner case is lifted by a certain distance, and a holder is provided inside the inner case. Supported by
A thermistor that is in contact with a lid made of metal that is integrally fixed to the inner case, a reed switch that is provided in the inner case and is connected to the heater circuit, and a reed switch that is provided in the outer case. And a magnetic flux generator that acts on the reed switch when the inner case is lowered due to the deformation of the spring due to its weight.

[Problems to be solved by the invention]

In the temperature sensor as described above, the bottom of an object to be heated, such as an inner pot, comes into contact with the lid of the sensor to lower the inner case against the spring due to its weight. Since it is necessary to sense the temperature of the heating body as efficiently as possible, the lid of the above-mentioned sensor which is in contact with the bottom surface of the heated body is made of a material having high thermal conductivity.

However, in that case, if the adhesion between the bottom surface of the object to be heated and the lid is poor, the heat transfer efficiency will be poor and accurate temperature control will not be possible. In order to eliminate the defect, it is required that the curved surface of the lid matches the curved surface of the bottom surface of the object to be heated, but the lid is usually made of a flat material on the periphery of the inner case. Since it is fixed to the inner case by bending and crimping the peripheral edge by press working, even if the curved surface shape is given by the molding processing of the lid before crimping processing, the strain due to crimping processing causes the upper surface of the lid. However, there is a problem in that the adhesiveness with the bottom surface of the object to be heated is impaired because the curved surface shape is changed. In press working, it is extremely difficult to predict the deformation of the curved surface due to the above-mentioned crimping work, which is a problem outside the control range for maintaining the working accuracy.

The present invention has been made to solve such a problem, so that even if the lid is crimped, the upper surface of the lid, which is deformed into the same shape as the bottom surface of the object to be heated, is prevented from being distorted. The purpose is to obtain the structure of the lid.

[Means for solving problems]

The temperature sensor for a cooker according to the present invention comprises an outer case fixed to the cooker body, an inner case inside the outer case having a wide upper edge and a thermistor holder for supporting the thermistor in an upper part. And a recess formed along the vicinity of the inner peripheral edge, covering the thermistor holder and crimping the peripheral edge to the peripheral edge of the inner case, and pressing the inner case toward the opening of the outer case. A support spring for urging and raising, a reed switch provided inside the inner case, and a magnetic flux generation that is provided integrally with the outer case and approaches the reed switch when the inner case descends to operate the reed switch. In the temperature sensor for a cooker including a device, the lid has a curved surface whose upper surface conforms to the shape of the bottom surface of the curved surface of the object to be heated placed thereon. A thermistor holder for supporting the star, the peripheral portion of the upper end extends to the peripheral edge of the inner case, and the reed switch is positioned on the side portion of the lower portion, and the lid is centered around the concave portion. The caulking secures the positioning of the thermistor holder, the thermistor, and the reed switch in the inner case.

[Action]

The inner region of the crimping margin of the lid is formed into a curved surface that conforms to the shape of the bottom surface of the object to be heated before crimping, but during the crimping process, bending due to the crimping of the crimping margin is performed. Since it is easily performed by the recess or groove formed in a ring shape, the strain of caulking does not reach the central portion of the lid, so that excellent adhesion between the bottom surface of the heated object and the top surface of the lid can be obtained.

〔Example〕

Each of the drawings shows an embodiment of the present invention, 1 is a lid, 1a is a crimping margin of the lid, 1b is a concave portion (FIG. 2) provided in a ring shape inside the bent portion of the crimping margin 1a, and 2 is The inner case is shown, and Fig. 1 shows the lid 1.
Fig. 2 is a perspective view showing a state in which the inner case is caulked, and Fig. 2 shows a cross section of the lid 1 bent until the caulking process. In FIG. 3, 3 is a thermistor holder whose upper end outer peripheral portion extends above the peripheral edge of the inner case 2, and 4 is a support spring, which urges the inner case 2 upward with respect to the outer case 5, that is, in the opening direction of the case. However, the entire inner case is lifted from the bottom surface of the outer case unless a load is applied to the upper surface of the lid 1. Reference numeral 6 is a thermistor supported by the thermistor holder, and 7 is a reed switch positioned by the concave portion 3a on the side of the lower portion of the thermistor holder 3. Reference numeral 8 in FIG. 4 denotes an object to be heated, the bottom surface 9 of which has a curved surface and the upper surface of the lid of the temperature sensor S.
It is shown that the 1d's are closely matched and closely attached. In this case, when the bottom surface of the object to be heated has a predetermined temperature, the thermistor 6
The resistance will control the power supply.

The recess 1b shown in FIG. 2 facilitates bending of the crimping margin 1a of the lid 1 when crimping the crimping margin 1a of the lid 1 to the peripheral edge of the inner case 2, and the upper surface 1d of the lid 1
It has the effect of blocking the strain effect that extends up to and can maintain the shape of the lid that was molded before caulking.

〔effect〕

According to the present invention, the accuracy of the curved surface of the top surface of the lid 1 can be easily controlled, the lid 1 can be manufactured uniformly, and the adhesion with the bottom surface of the object to be heated is ensured, so that a temperature sensor having an excellent temperature detection effect can be obtained. . In addition, by swaging the lid, the thermistor holder, the thermistor, and the reed switch can be simultaneously and easily positioned in the inner case.

[Brief description of drawings]

1 is a perspective view of the temperature sensor of the present invention, FIG. 2 is a sectional view of the lid of FIG. 1, FIG. 3 is a sectional view of the temperature sensor of the present invention,
FIG. 4 is a sectional view of a cooker incorporating the temperature sensor of the present invention. In the figure, 1 ... Lid, 1a ... Crimping allowance, 1b ... Recess, 1d ... Top of lid, 2 ... Inner case, 3 ... Thermistor holder, 4 ... Support spring, 5 ... Outer case, 6 ... Thermistor, 7 ... Reed switch, 8 ... Heated object.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 60-66715 (JP, A) JP 55-9249 (JP, B2) JP 61-22261 (JP, Y2) JP 58- 55852 (JP, Y2) Akira Hashimoto "Press Bending" Published by Nikkan Kogyo Shinbun (May 30, 1968)

Claims (1)

[Scope of utility model registration request] 1. An outer case fixed to a cooker main body, an inner case inside the outer case having a wide upper edge and a thermistor holder for supporting a thermistor in an upper part, and an inner case. A recess that is formed along the vicinity and covers the thermistor holder and crimps the peripheral edge of the inner case to the peripheral edge of the inner case; and a support that pushes up the inner case toward the opening of the outer case. A spring, a reed switch provided inside the inner case, and a magnetic flux generator that is provided integrally with the outer case and approaches the reed switch when the inner case descends to operate the reed switch. In the temperature sensor for a cooking device, the lid has a curved surface whose upper surface conforms to the shape of the bottom surface of the curved surface of the object to be heated placed thereon, and which supports the thermistor. The star holder has a peripheral edge at the upper end extending above the peripheral edge of the inner case, the reed switch is positioned at the side of the lower portion, and the lid is crimped around the concave portion. The positioning sensor secures the positioning of the thermistor holder, the thermistor, and the reed switch in the inner case.