JP5237983B2 - Temperature sensor - Google Patents

Description

  The present invention relates to a temperature sensor used for temperature detection of a detachable cooked object.

  In the cooking device in which the heated cooking body can be freely attached to and detached from the heated body, the temperature of the heated cooking body is detected using a temperature sensor for the cooking device.

  As a temperature sensor for a cooking appliance, for example, there is one described in Japanese Patent No. 3326737. According to the invention described in Japanese Patent No. 3326737, for example, when a detachable heated body is attached to the heating body, the temperature sensor for the cooker detects the temperature of the heating body by contacting the heated body. The temperature sensor includes a thermistor element and a thermal fuse, an aluminum lid that contacts the heated body, a case that houses the temperature sensor and the aluminum lid is fitted, and the case in one direction. A holder that is movably held, bends the lead so that one of the two leads of the thermal fuse is disposed close to the aluminum lid, and has a high thermal conductor between the lead and the aluminum lid. It is described that a temperature sensor for cooking appliances obtained by arranging the above can be obtained.

  Note that the content of the invention described in Japanese Patent No. 3326737 is described in Japanese Patent Application Laid-Open No. 2000-051067, which is its publication.

  In Patent Document 1, in order to enable detection of the inner pot by electric means, to simplify the structure of the center sensor part, and to achieve downsizing, cost reduction, etc., an inner pot stored in the outer case, In an electromagnetic rice cooker comprising a work coil that heats the inner pot, an inverter circuit including a resonance capacitor and a switching transistor that allows a high-frequency current to flow through the work coil, and a temperature sensor that detects the temperature of the inner pot. Based on the resonance voltage detection means for detecting the resonance voltage of the coil and the resonance voltage detection value of the resonance voltage detection means in the rice cooking start state in which the inverter circuit is operated or the inner pan temperature detection value of the temperature sensor in the same state It is described that an electrical set state determining means for determining the set state of the inner pot is provided.

  In Patent Document 2, in a cooker temperature sensor, a holder made of a heat-resistant resin material to which a heat receiving plate that receives heat generated by a heated object, a temperature sensing element that contacts the heat receiving plate, a temperature fuse, and a detection element is attached. A heat receiving plate and a holder that are caulked to the inner case, and a temperature sensor for a cooker comprising an outer case that holds the inner case via a spring, and a magnet that houses a magnet that operates on the inner case and the detection element In order to make it easy to incorporate the holder into the outer case, a locking projection 93 is provided at the lower portion of the leg portion 92 of the inner case 9, and a hole for engaging with this is provided in the bottom surface of the outer case 11, thereby providing a magnet holder. It is described that a protrusion 16 is provided on the bottom surface of 12 and a hole to be fitted to the bottom surface of the outer case 11 is provided.

  Further, in Patent Document 3, in order to improve the thermal responsiveness of a heat-sensitive body comprising a heat-collecting plate that collects heat generated by the heated object and a heat-sensitive element that contacts the heat-collecting plate, the heat-collecting plate 2 The material is made of aluminum nitride, so that the heat sensitive element 1 is directly embedded in the heat collecting plate without being covered with an insulating protective tube.

  Further, in Patent Document 4, there is no deformation of a part made of resin, and it can be reused and improved in terms of safety, so that the temperature can be detected with high efficiency. The body 31 has a holder 34. The holder 34 is provided with the reed switch 12, the thermistor 13, and the thermal fuse 19. The thermal fuse 19 is close to the heating body 5 and can be placed at the highest temperature. When an abnormal heating state occurs, the thermal fuse 19 is blown immediately. Further, it is described that the thermal fuse 19 is arranged in parallel with the uniaxial direction to reduce the size, and the diameter of the through hole 6 at the center of the heating element 5 is reduced.

JP 07-275123 A Japanese Patent Laid-Open No. 06-241909 Japanese Patent Laid-Open No. 07-043218 Japanese Utility Model Publication No. 06-062925

  In the cooking device, cooking is performed by heating a heated cooking body such as a pan. At this time, the temperature sensor provided in the cooking device detects the temperature of the heated cooking body such as a pan, and detects whether the inside of the cooking pan or the like is maintained at an appropriate temperature state. In addition, in order to detect an excessive rise in temperature, control for detecting an abnormal temperature is performed.

Since the temperature sensor for performing such control is a safety device for a cooker, it is required that the temperature of a heated cooking object such as a pan can be detected reliably and with high response. .
Therefore, in order to comply with safety standards (such as IEC; International Electrotechnical Commission standards, etc.) related to cooking appliances, a specified insulation distance is provided between the pan and the temperature sensitive element (thermistor and temperature fuse). When the predetermined insulation distance is provided, it is inevitable that the thermal responsiveness is lowered as compared with the case where the insulation distance is not provided (not complying with the standard of the insulation distance).

  Thus, in order to perform optimal cooking in a cooker, high-speed thermal response is required, but in order to comply with safety standards, when the insulation distance between the pan and the temperature sensing element is increased However, there is a problem that the thermal response is inevitably lowered.

  The present invention has been made in view of such circumstances, and a temperature sensor capable of avoiding a decrease in thermal response even when the insulation distance between the pan and the temperature sensing element is increased. It is intended to provide.

  (1) In the prior art, a resin such as silicon is used as an electrical insulator between a cooked object such as a pan and a temperature sensitive element, but this should be changed to a ceramic with good thermal conductivity. Therefore, it is possible to achieve high responsiveness, thereby avoiding a decrease in thermal responsiveness.

(2) In the prior art, the thermistor 1, which is set in the sensor holder 6 has been covered by the thermally conductive material or air, such as a silicone grease 8, a cylindrical shape having a thermistor 1 on the ceramic part 3 It is possible to change to a structure for receiving heat by the ceramic part 3 by accommodating the first accommodating part 31 and filling and sealing the adhesive 5, thereby realizing high responsiveness.

  (3) Further, by providing the ceramic part 3 in which the thermistor 1 in the case of (2) is accommodated on the upper surface of the sensor holder 6 and covering this part with a thin metal cap 4, High responsiveness can be achieved.

  According to the present invention, by adopting the structures of (1) to (3) above, it is possible to realize a highly responsive temperature sensor for a cooker while satisfying the safety standard related to the cooker.

It is a figure which shows the assembled state of the temperature sensor for cookers which comprised integrally the electric insulator between the pan of this invention, and two temperature sensing elements. It is a figure which shows the state which decomposed | disassembled the temperature sensor for cookers which comprised integrally the electric insulator between the pan of this invention and two temperature sensing elements. It is a figure which shows the assembled state of the temperature sensor for cookers comprised by dividing the electric insulator between the pan of this invention and two temperature sensing elements into plurality (for example, divided into 2). It is a figure which shows the state which decomposed | disassembled the temperature sensor for cookers comprised by dividing | segmenting into several (for example, 2 division | segmentation) the electrical insulator between the pan of this invention and two temperature sensing elements.

  Embodiments of the present invention will be described below with reference to the drawings.

(1) In FIGS. 1 and 2 , reference numeral 3 denotes a ceramic portion. Inside the ceramic portion 3, a first housing portion 31 (cylindrical recess) for housing the thermistor 1 and a part of the thermal fuse 2. And a second housing portion 32 (concave portion) for housing the housing. As a modification, instead of the integrated ceramic portion 3, as shown in FIGS. 3 to 4, a pair of ceramic portions 3 a and 3 b separated from each other, that is, a first housing portion that houses the thermistor 1. A temperature sensor is configured by the ceramic portion 3 a provided with 31 (cylindrical recess) and the ceramic portion 3 b provided with the second storage portion 32 (recess) that stores a part of the thermal fuse 2. May be.
As described above, the thermistor 1 as the temperature sensing element is accommodated in the first accommodating portion 31 and a part of the thermal fuse 2 is accommodated in the second accommodating portion 32, whereby the high temperature in the thermistor 1 and the thermal fuse 2 . Realize responsiveness.

(2) In FIGS. 1 to 4, reference numeral 1 is a thermistor, 2 is a thermal fuse, 3 , 3a and 3b are ceramic parts, and the thermistor 1 and thermal fuse 2 are filled with adhesive 5 and silicon grease 8 and sealed. By doing so, high responsiveness in the thermistor 1 and the thermal fuse 2 is realized.

  (3) In FIGS. 1 to 4, reference numeral 4 denotes a metal cap, and high response is realized by reducing the thickness of the metal cap 4.

  The temperature sensor of the present invention is suitable for use in a cooking device in which a heated cooking body can be freely attached to and detached from a heated body, when the temperature of the heated cooking body is detected using the temperature sensor for the cooking device. It is.

1 Thermistor 1a Thermistor lead wire 2 Thermal fuse 2a Thermal fuse lead wire 3, 3a, 3b Ceramic
31 1st accommodating part (accommodating a thermistor)
32 2nd accommodating part (accommodating a part of thermal fuse) 4 Metal cap 5 Adhesive material 6 Sensor holder 7a, 7b Lead wire 8 Silicon grease

Claims (3)

A temperature sensor for detecting the temperature of the cooked object,
A first housing portion that is an electrical insulator and is made of ceramic, which is a material having better thermal conductivity than silicon resin, and that houses a thermistor therein, and a second housing portion that houses a part of the thermal fuse And a ceramic part provided with,
A thin metal cap for covering the ceramic part,
The temperature sensor is characterized in that the thermistor is filled with an adhesive and sealed and accommodated in the first accommodating part of the ceramic part . The said ceramic part consists of the 1st ceramic part provided with the said 1st accommodating part formed separately from each other, and the 2nd ceramic part provided with the said 2nd accommodating part. The temperature sensor according to 1. 3. The temperature sensor according to claim 1, wherein a part of the thermal fuse is filled with silicon grease and is accommodated in the second accommodating portion of the ceramic portion.

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