JP5326408B2 - Temperature sensor - Google Patents

Description

  The present invention relates to a temperature sensor used in an electromagnetic field environment such as in a microwave induction heating apparatus.

Conventionally, various types of temperature sensors have been proposed as temperature sensors for measuring temperatures in an electromagnetic field environment such as in a microwave induction heating device (microwave oven). For example, Patent Document 1 discloses a temperature measuring unit that detects a temperature difference as a potential difference, an electromagnetic wave shielding unit that is formed of a material that shields electromagnetic waves and covers the temperature measuring unit, and an electromagnetic wave blocking unit that includes a heat insulating material. A glass tube covering the outside.
JP 2007-17212 A

  As described above, the conventional temperature sensor is covered with a hard object such as a glass tube. Therefore, when a liquid object is heated with a microwave induction heating device, the temperature of the object is measured with the glass tube. However, it is difficult to track and measure the temperature of a solid object, especially a solid object that deforms greatly due to thermal expansion, foaming, etc. There is a problem.

  Therefore, the present invention can be applied to a solid object that is greatly deformed and easily disintegrates, such as food that can be processed using a microwave induction heating device such as sponge cake. An object of the present invention is to provide a temperature sensor that can appropriately measure the temperature without being collapsed and following the deformation. For example, in the process of heating and expanding foods that can be processed using a microwave induction heating device such as the sponge cake mentioned above, and foaming molding of polyurethane resin, the measurement object is destroyed in the conventional technology, so the target position is The temperature cannot be tracked and measured. Further, in the prior art, since the temperature sensor has excessive rigidity, accurate measurement cannot be performed by changing the foam shape / foam state of the object to be measured.

  In order to achieve the above object, the present invention provides a temperature sensor used for measuring a temperature in an electromagnetic wave environment, extending in the longitudinal direction and detecting a temperature difference as a potential difference, and the measurement sensor. A belt-shaped portion that is formed in a belt shape extending in the same direction as the longitudinal direction of the warming portion, includes an insulating portion that covers the temperature measuring portion, and a metal covering portion that covers the surface of the insulating portion, and is defined by the insulating portion It has the flexibility which can be bent at least with respect to the longitudinal direction.

  As described above, according to the temperature sensor according to the present invention, since the insulating portion that coats the temperature measuring portion is formed in a flexible belt shape, it is pasted along the surface of the measurement object. Alternatively, the temperature of the solid measurement object can be easily measured by inserting it at a desired position inside.

  As described above, according to the present invention, it is possible to appropriately perform temperature measurement by tracking the deformation of a desired position of the object to be measured even for a solid object that is greatly deformed and easily collapses. Temperature sensors that can be provided.

  Next, an embodiment of a temperature sensor according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a temperature sensor according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. The temperature sensor according to the present embodiment is formed to extend in the longitudinal direction, and is formed in a strip shape extending in the same direction as the longitudinal direction of the thermocouple 10 and the thermocouple 10 that detects a temperature difference as a potential difference, and covers the thermocouple 10. The insulating film 12 which is an insulating part, the metal coating | coated part 14 which coat | covers the surface of the insulating film 12, and the earth | ground 18 connected to the metal coating part 14 with the clip 16 are provided.

  The thermocouple 10 is formed in a straight line and has flexibility, and its diameter is 0.025 to 1 mm. The thermocouple 10 only needs to detect a temperature difference as a potential difference. For example, a nicrosyl / nysil thermocouple, a chromel / constantan thermocouple, an iron / constantan thermocouple, a copper / constantan thermocouple, a chromel that can be used even at high temperatures. -Alme thermocouples, platinum / rhodium thermocouples, etc. can be used.

  In the temperature sensor according to the present embodiment, the insulating film 12 covers a position of a predetermined length from the tip of the thermocouple 10. The insulating film 12 is made of a synthetic resin having flexibility, and the synthetic film preferably has heat resistance to a temperature of 150 ° C. or higher. For example, polyimide, polyester, sumilite (registered trademark), particularly A polyimide is preferred.

  In the temperature sensor according to the present embodiment, the metal covering portion 14 is made of a conductive material such as copper or aluminum, and is particularly preferably made of copper. Formation of the metal coating part 14 on the surface of the insulating film 12 is performed by, for example, known sputtering.

  In the temperature sensor according to the present embodiment, the insulating film 12 and the metal covering portion 14 are formed by coating the metal covering portion 14 on one surface of the tape-like insulating film 12. As shown in FIG. 2, the tape-like insulating film 12 covered with the metal covering portion 14 is folded, the thermocouple 10 is sandwiched, and a heat-resistant adhesive such as a heat-resistant polyimide adhesive is interposed between the insulating films 12. Is glued. By using the tape-like insulating film 12 coated with the metal coating portion 14 as described above, the temperature sensor according to the present embodiment can be easily manufactured and is suitable for mass production. Further, the cost can be reduced by using an inexpensive material, and further, it is lighter and more flexible than a conventional temperature sensor.

  In the temperature sensor according to the present invention, the earth 18 is connected to the metal coating portion 14 and discharges electromagnetic waves leaked outside the electromagnetic environment. By providing the ground 18 in this manner, leakage of electromagnetic waves can be prevented as much as possible. In addition to the clip 16, the ground 18 may be electrically connected directly to the metal cover 14 by solder or the like.

  The temperature sensor according to the present embodiment has flexibility that can be bent at least in a linear direction. As a measuring method for judging the flexibility, there is a method of measuring the deflection of the material. The deflection can be measured according to the JIS standard “JISK7171 Plastics—Bending Properties Test Method”. The temperature sensor according to the present invention can be formed from any metal thin film / synthetic resin, and is a flexible material / shape that does not buckle against deformation of the measurement object, and has an equivalent elastic modulus as a laminated material. It is preferably 10 GPa or less, and particularly preferably 6 GPa or less.

  In addition, the thickness of the band-shaped portion of the temperature sensor according to the present embodiment is preferably a thickness capable of closing the microwave oven door in a state of being sandwiched between the microwave oven doors. The thickness of the thickest part is 1.2 mm or less, preferably 0.1 to 0.5 mm or less. By forming a thin band-shaped portion coated with the temperature measuring unit in this manner, the temperature measuring unit can be inserted into the microwave oven while being sandwiched between the microwave oven doors. It is not necessary to provide a hole for inserting the part.

  Next, a method for using the temperature sensor according to the present embodiment will be described. First, the solid object 22 which is a measuring object is installed in the microwave oven 20, and the strip | belt-shaped part of a temperature sensor is stuck on the surface with the heat resistant tape 24 as shown in FIG. 3, or the front-end | tip part is measured object. The temperature sensor is inserted into a desired position so that the width direction of the temperature sensor is perpendicular to the deformation direction of the object. Next, as shown in FIG. 4, the microwave induction heating device (microwave oven) 22 is closed on the door of the microwave induction heating device (microwave oven) with the front end side of the belt-shaped portion sandwiched between the doors 22 </ b> A of the microwave induction heating device (microwave oven) 22. And a measurement object is heated with a microwave induction heating apparatus (microwave oven), and the temperature change of the measurement object in that case is measured as a potential difference which generate | occur | produces in a thermocouple part.

  The temperature sensor according to the present embodiment is connected to a temperature display device 28 via a copper wire 26 as shown in FIG. 4, and the measured potential difference is converted into temperature and displayed.

  In the temperature sensor according to the present embodiment, the ground 18 can be connected to a microwave induction heating device (microwave oven) 20 and discharged to the microwave induction heating device (microwave oven) as shown in FIG. is there. By this operation, it is possible to prevent sparking during microwave irradiation and shield leaking microwaves outside the system to a level that satisfies the “safety standard of the Electrical Appliance and Material Control Law”.

It is a top view of the Example of the temperature sensor which concerns on this invention. It is sectional drawing along the AA 'line of FIG. It is a conceptual diagram which shows the state which affixed the strip | belt-shaped part of the temperature sensor which concerns on a present Example on the measuring object. It is a conceptual diagram of the state which measures temperature with the temperature sensor which concerns on a present Example. It is another conceptual diagram of the state which measures temperature with the temperature sensor which concerns on a present Example.

Explanation of symbols

10 Thermocouple 12 Insulating Film 14 Metal Cover 18 Ground

Claims (5)

In a temperature sensor used to measure temperature in an electromagnetic environment,
A temperature measuring unit that extends in the longitudinal direction and detects a temperature difference as a potential difference;
An insulating part that is formed in a strip shape extending in the same direction as the longitudinal direction of the temperature measuring part and covers the temperature measuring part;
A metal coating that covers the surface of the insulation;
An earth connected to the metal coating and discharging electromagnetic waves leaked outside the electromagnetic environment ,
A temperature sensor characterized in that a band-shaped portion defined by the insulating portion has flexibility capable of bending at least in the longitudinal direction.   The temperature sensor according to claim 1, wherein the insulating portion is made of a synthetic resin having flexibility and heat resistance of 150 ° C. or more.   The temperature sensor according to claim 2, wherein the synthetic resin is polyimide.   4. The temperature sensor according to claim 2, wherein the temperature measuring section is sandwiched by bending a tape-shaped member coated with a metal constituting the metal covering section on one surface of the synthetic resin. The thickness of the elongate portions, in a state sandwiched door of the microwave induction heating device, the temperature of claims 1 to 4, wherein any one, characterized in that it is possible capable thickness close the microwave door sensor.

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