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    • 31. 发明专利
    • DIFFERENTIAL TEMPERATURE SENSOR
    • JPS58210528A
    • 1983-12-07
    • JP9420582
    • 1982-05-31
    • MATSUSHITA ELECTRIC WORKS LTD
    • WADA TOSHIAKI
    • G01K3/08G01K5/62G01K5/68
    • PURPOSE:To perform zero point correction and to display a differential temp. exactly by mounting compensation bimetals of a spiral type which generate torque in the direction opposite from the bimetals on the side of a differential temp. sensor opposite from the fulcrum shaft. CONSTITUTION:An indicating pointer 6 is mounted on the forward end of the fulcrum shaft 5 of a differential temp. sensor on the side opposite from a sensor chamber 3, and one end 9b of compensation bimetals 9 of a spiral type is fixed to the lower part thereof. The other end 9a is fixed to a heat insulation material 1. The bimetals 9 rotate in the direction opposite from the rotating directions of bimetals 4, and generate the torque in the opposite direction. When the sensor is put in a room of a specified temp., the rotations of the bimetals 4 and 9 negate with each other and the pointer 6 is positioned at the origin of a temp. indicating nameplate 7 in both stages when the temp. in the room is high or low. Therefore, the zero point compensation is accomplished, and the differential temp. between the inside and outside of the room is displayed exactly with a transparent plate 2.
    • 38. 发明专利
    • THERMAL RELAY
    • JPH04109528A
    • 1992-04-10
    • JP22505190
    • 1990-08-29
    • HITACHI LTD
    • SHIMADA TOSHIOKOBAYASHI MORIO
    • H01H61/01G01K5/68H01H37/54
    • PURPOSE:To previously control a breakage portion of a bimetallic strip to an ideal position by providing a weak point (stress concentration part) on a part or a peripheral part of radially arranged slits. CONSTITUTION:In a bimetallic strip 2, a shaft supporting hole 2a for inserting and shaft-supporting an adjusting screw is provided on the center part and plural slits 2b-2g are provided radially from the shaft supporting hole 2a. Also a stress concentration part is provided in which a bottom surface 2c' of an optional slit 2c, coincident with neither a position on the center line X-axis connecting a pair of movable contacts 3 nor a position on the center line Y-axis orthogonal to the X-axis, is formed with a corner of R' radius smaller than a corner of R radius of the bottom surfaces 2b'-2g' of the other slits 2b-2g. When an overcurrent flows into a load connected in series, the metal 2 is heated with a heater 6, and when the metal 2 reaches a given temperature, it is reversed so that the movable contact 3 is quickly separated from a fixed contact 4 to break a circuit.