JP2006084247A - Temperature indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To confirm a low temperature, a medium temperature and a high temperature in relation to a temperature indicator for displaying the temperature of a measuring object by being mounted on the measuring object such as a pipe for steam or hot water, a valve for controlling the high temperature fluid, or an apparatus. <P>SOLUTION: This temperature indicator 1 has a case 2 to be mounted on the measuring object; a low-temperature side see-through part 17 provided on one end side of the case 2; a high-temperature side see-through part 18 provided on the other end side of the case 2; a temperature responsive member 10 contracted or elongated by a temperature change, whose one end side is mounted in the case 2; a movable member 9 mounted on the other end side of the temperature responsive member 10 and displaced in the axial direction of the case by contraction or elongation of the temperature responsive member 10; a low temperature display part 11 mounted on one end side of the movable member 9, and projecting toward the low-temperature side see-through part 17 when reaching a prescribed low temperature or lower; and a high temperature display part 13 mounted on the other end side of the movable member 9, and projecting toward the high-temperature side see-through part 18 when reaching a prescribed high temperature or higher. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature indicator that is attached to an object to be measured such as a pipe for steam or hot water, a valve or a device for controlling these high-temperature fluids, and displays the temperature level of the object to be measured. Knowing the temperature of piping, valves, and equipment of high-temperature fluid not only helps prevent burns, but also knows the operating state of the valve and the operating state of the equipment. For example, in the case of a steam trap that automatically discharges condensate without escaping steam from the steam piping system, the steam is normal at a medium temperature if it is within a predetermined temperature range, but if it is higher than the predetermined temperature range, It can be inferred that there is a leaking high temperature abnormality, and if the temperature is lower than the predetermined temperature range, it can be inferred that the drainage is insufficient or cannot be drained.

  The conventional temperature indicator is made of a shape memory alloy to make a thin plate and colored so that the front and back surfaces have different colors, so that the surface of the thin plate is deformed at a high temperature below the predetermined temperature so that the back side can be seen. A part of the thin plate is fixed to the surface of a pipe or a valve.

The above-mentioned conventional temperature indicator displays whether the temperature is low or high at a predetermined temperature. If the temperature is lower than the predetermined temperature, it is normal at medium temperature or abnormal at low temperature. There is a problem in that it cannot be distinguished, and when it is higher than a predetermined temperature, it cannot be distinguished whether it is normal at medium temperature or abnormal at high temperature.
Japanese Utility Model Publication No. 61-211941

  The problem to be solved is to be able to confirm low, medium and high temperatures.

  The present invention includes a case attached to an object to be measured, a low temperature side see-through portion provided on one end side of the case, a high temperature side see-through portion provided on the other end side of the case, and one end side attached to the case. A temperature-responsive member that contracts or expands due to a change, a movable member that is attached to the other end of the temperature-responsive member and that displaces in the axial direction of the case when the temperature-responsive member contracts or expands, and is attached to one end of the movable member. A low-temperature display portion that protrudes to the low-temperature side see-through portion when the temperature is lower than a low temperature, and a high-temperature display portion that is attached to the other end of the movable member and protrudes to the high-temperature side see-through portion when the temperature is higher than a predetermined temperature. .

  Since this invention can confirm low temperature, medium temperature, and high temperature, it produces the outstanding effect that low temperature abnormality, such as insufficient drainage or inability to drain, and normal, high temperature abnormality such as steam leakage can be distinguished.

  According to the present invention, the low temperature display portion protrudes from the low temperature side fluoroscopic portion when the temperature is lower than a predetermined low temperature, and the high temperature display portion protrudes from the high temperature side fluoroscopic portion when the temperature is higher than a predetermined high temperature. Therefore, it can be confirmed that the temperature is lower than the predetermined temperature range by confirming the protrusion of the low temperature display part to the low temperature side fluoroscopic part, and the predetermined temperature can be confirmed by confirming the protrusion of the high temperature display part to the high temperature side fluoroscopic part. It can be confirmed that the temperature is higher than the temperature range, and it is determined by immersing inward from the low temperature side fluoroscopic portion of the low temperature display portion and inward from the high temperature side fluoroscopic portion of the high temperature display portion. It can be confirmed that the temperature is medium.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The case 2 of the temperature indicator 1 is formed of a left main body 3 and a right main body 4 each having a hexagonal cross section, and the right end portion of the left main body 3 is press-fitted into the left end portion of the right main body 4 and fixed. The right main body 4 has a low-temperature side see-through part 17 made of a cut at the right end, and the left main body 3 has a high-temperature side see-through part 18 made of a cut at the left end. The left main body 3 and the right main body 4 are made of aluminum having a high thermal conductivity. Each of the left main body 3 and the right main body 4 may be formed in a polygonal shape such as a quadrangle or a cylindrical shape. The left main body 3 integrally includes a partition wall 6 having a through hole 5 in the center, and the right main body 4 integrally includes a partition wall 8 having a through hole 7 in the center. A movable member 9 is disposed in the case 2 through the through hole 5 and the through hole 7. The movable member 9 is guided in the through hole 5 and the through hole 7 and is displaced in the axial direction of the case 2. One end (right end) side of the temperature-responsive member 10 made of bimetal is welded to the partition wall 8 of the right main body 4. The other end (left end) side of the temperature responsive member 10 is welded and attached to substantially the center of the movable member 9. A low temperature display 11 having a U-shaped cross section is attached to one end (right end) of the movable member 9 with a set screw 12, and a high temperature display 13 having a U-shaped cross section on the other end (left end) of the movable member 9. Is attached with a set screw 14. The low temperature side see-through part 17 and the high temperature side see-through part 18 can also be formed by a window opened in the case 2 or a transparent member attached to the case 2.

  The bimetal is obtained by firmly bonding two kinds of metals or alloys having different thermal expansion coefficients into a plate shape, and bends in response to a temperature change. A spiral winding made by spirally winding a strip-shaped bimetal flat plate is spirally wound again to form a double spiral winding. In the first spiral shape, the inside is made of a low expansion material and the outside is made of a high expansion material. In the case of this helically wound shape, the radius becomes smaller and the length becomes longer when the temperature is high, and the opposite action occurs when the temperature is low. And in the case of the double helix formed using this, the radius becomes smaller and the length becomes longer when the temperature becomes high, and the opposite action is exerted when the temperature becomes low.

  The temperature indicator 1 is attached to, for example, an adhesive tape 16 on the outer surface of a bimetal steam trap 15 as an object to be measured. The temperature responsive member 10 contracts to displace the movable member 9 when the temperature of the bimetallic steam trap 15 decreases, and expands to displace the movable member 9 to the left when the temperature of the bimetallic steam trap 15 increases. . When the bimetal steam trap 15 operates normally and, for example, condensate below a set temperature of about 65 ° C. to 75 ° C. is automatically discharged, the low temperature display unit 11 is located inside the low temperature side fluoroscopic unit 17. The high temperature display unit 13 is immersed more inward than the high temperature side see-through unit 18. Thereby, it can confirm that it is normal. When the bimetal steam trap 15 is in a state of insufficient drainage or inability to drain and becomes a predetermined low temperature, for example, 60 degrees C or less, the temperature responsive member 10 contracts and the movable member 9 is displaced to the right, and the high temperature display 13 is on the high temperature side. The low-temperature display unit 11 protrudes into the low-temperature side see-through unit 17 although it is immersed inward from the see-through unit 18. Thereby, the low temperature abnormality which is a state with insufficient drainage or inability to drain can be confirmed. When the bimetal steam trap 15 leaks condensate or steam at a set temperature or higher and reaches a predetermined high temperature, for example, 80 ° C. or higher, the temperature responsive member 10 expands and the movable member 9 is displaced to the left. Is deeper inward than the low temperature side see-through part 17, but the high temperature display part 13 protrudes into the high temperature side see-through part 18. Thereby, the high temperature abnormality which the steam is leaking can be confirmed.

Sectional drawing of the temperature indicator of the Example of this invention. The front view which shows the state which attached the temperature indicator of the Example of this invention to the bimetal type steam trap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Temperature indicator 2 Case 3 Left main body 4 Right main body 5,7 Through-hole 6,8 Bulkhead 9 Movable member 10 Temperature response member 11 Low temperature display part 13 High temperature display part 15 Bimetal type steam trap 16 Adhesive tape 17 Low temperature side see-through part 18 High-temperature side fluoroscopic part

Claims (1)

A case attached to the object to be measured, a low temperature side see-through portion provided on one end side of the case, a high temperature side see-through portion provided on the other end side of the case, and one end side attached to the case and shrinking due to temperature change or A temperature-responsive member that extends, a movable member that is attached to the other end of the temperature-responsive member, and that is displaced in the axial direction of the case due to contraction or extension of the temperature-responsive member, and that is attached to one end of the movable member and below a predetermined low temperature A temperature indicator comprising: a low temperature display portion projecting to the low temperature side fluoroscopic portion; and a high temperature display portion attached to the other end of the movable member and projecting to the high temperature side fluoroscopic portion when the temperature is higher than a predetermined temperature.

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