JP4563187B2 - Temperature indicator - Google Patents

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, or a valve or device for controlling these high-temperature fluids, and displays the temperature of the object to be measured. Knowing the temperature of high-temperature fluid piping, valves, and equipment 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, it is normal at a medium temperature if it is within a 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 the drainage is impossible.

  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 temperature responsive member attached at one end in the case and contracted or expanded due to a temperature change, and attached to the other end of the temperature responsive member by contracting or extending the temperature responsive member. A movable member that is displaced in the axial direction of the case, a low temperature display portion that is attached to one end side of the movable member and protrudes from the case when the temperature is lower than a predetermined low temperature, and is attached to the other end side of the movable member and is higher than a predetermined high temperature possess high temperature display portion projecting from the case, and excessive shrinkage prevention member for preventing certain level of shrinkage of the temperature responsive member, above a certain contraction of the temperature responsive member by the high temperature display unit is brought into contact with excessive shrinkage prevention member It is characterized by preventing .

The present invention, have a excessive shrinkage prevention member for preventing certain level of shrinkage of the temperature responsive member, thereby preventing a constant or shrinkage of the temperature responsive member by the high temperature display unit is brought into contact with excessive shrinkage prevention member since, it is possible to prevent the temperature responsive member is over-shrinks if the temperature of the object to be measured has been reduced further than a predetermined low temperature. Therefore, the plastic deformation of the temperature responsive member can be prevented, and an excellent effect that the initial good temperature display function can be maintained over a long period of time is produced.

  In the present invention, the low temperature display portion protrudes from the case when the temperature is lower than a predetermined low temperature, and the high temperature display portion protrudes from the case 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 from the case of the low temperature display portion, and the temperature is higher than the predetermined temperature range by confirming the protrusion from the case of the high temperature display portion. It can be confirmed that the temperature is within a predetermined temperature range by confirming the immersion of the low temperature display portion and the case of the high temperature display portion.

  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 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 cold display section 11 having a U-shaped cross section is attached to one end (right end) side of the movable member 9 with a set screw 12, and a high temperature display section 13 having a U-shaped cross section is mounted on the other end (left end) side of the movable member 9. Is attached with a set screw 14. The partition wall 6 functions as an over-shrinkage prevention member that prevents the temperature-responsive member 10 from shrinking more than a certain amount by restricting the displacement of the high-temperature display unit 13 in the right direction. The partition wall 8 functions as an overextension preventing member that prevents the temperature responsive member 10 from extending beyond a certain level by restricting the leftward displacement of the low temperature display portion 11.

  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 type 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, both the low temperature display portion 11 and the high temperature display portion 13 are in the case 2. I'm immersed in it. Thereby, it can confirm that it is normal. When the bimetal steam trap 15 is in a state where drainage is insufficient or cannot be drained and the temperature becomes a predetermined low temperature, for example, 60 ° C. or less, the temperature responsive member 10 contracts and the movable member 9 is displaced to the right. Although it is immersed, the low temperature display part 11 protrudes from the case 2. Thereby, the low temperature abnormality which is a state with insufficient drainage or inability to drain can be confirmed. When the temperature of the bimetallic steam trap 15 further falls below a predetermined low temperature and reaches, for example, 50 ° C., the high temperature display portion 13 comes into contact with the partition wall 6 to prevent overcontraction of the temperature responsive member 10. 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 immersed in the case 2, but the high temperature display portion 13 protrudes from the case 2. Thereby, the high temperature abnormality which the steam is leaking can be confirmed. When the temperature of the bimetallic steam trap 15 further rises above a predetermined high temperature and reaches, for example, 90 ° C., the low temperature display portion 11 comes into contact with the partition wall 8 and the temperature responsive member 10 is prevented from overextension.

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 Through-hole 6 Bulkhead (over-shrinkage prevention member)
7 Through-hole 8 Bulkhead (overstretch prevention member)
DESCRIPTION OF SYMBOLS 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

Claims (1)

A case attached to the object to be measured, a temperature-responsive member attached to one end of the case and contracted or expanded due to temperature change, and an axis of the case attached to the other end of the temperature-responsive member by contraction or extension of the temperature-responsive member A movable member that is displaced in the direction, a low temperature display portion that is attached to one end side of the movable member and protrudes from the case when the temperature is lower than a predetermined low temperature, and a protrusion that is attached to the other end side of the movable member and protrudes from the case when the temperature is higher than the predetermined temperature high temperature display unit, it possesses a excessive shrinkage prevention member for preventing certain level of shrinkage of the temperature responsive member, to prevent certain level of shrinkage of the temperature responsive member by the high temperature display unit is brought into contact with excessive shrinkage prevention member Temperature indicator.

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