JP4717568B2 - 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, 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.

  A conventional temperature indicator includes a cylindrical case attached to the object to be measured, a temperature responsive member accommodated in the case and contracted or expanded due to a temperature change of the object to be measured, and a temperature responsive member attached to the temperature responsive member. A movable member that is displaced in the axial direction of the case by contraction or expansion, and a display unit that is attached to the movable member and protrudes outward from or intrudes into the case.

In the conventional temperature indicator, a case attached to an object to be measured is formed in a cylindrical shape. Therefore, when the object to be measured is a cylindrical shape such as a pipe, the contact area between the object to be measured and the case is small, so that the heat of the object to be measured is not easily transmitted to the case, and the temperature detection sensitivity of the object to be measured There was a problem that was low.
JP2003-42856

  The problem to be solved is to provide a temperature indicator with high detection sensitivity of the temperature of the object to be measured, because the heat of the object to be measured is easily transferred to the case.

The present invention includes a case attached to an object to be measured, a temperature responsive member accommodated in the case and contracted or expanded due to a temperature change of the object to be measured, and a case attached to the temperature responsive member by contraction or extension of the temperature responsive member. A movable member that is displaced in the axial direction, and a display unit that is attached to the movable member and that protrudes outward from or intrudes into the case, and has at least two concave curved surfaces having different diameters on the outer surface of the case The surface of the object to be measured is brought into contact with one of the at least two concave curved surface parts having different diameters on the outer surface of the case in accordance with the diameter of the cylindrical part of the outer surface of the object to be measured. Is easy to be transmitted to the case .

In the present invention, at least two concave curved surface portions having different diameters are formed on the outer surface of the case, and one surface of at least two concave curved surface portions having different diameters on the outer surface of the case is connected to the cylindrical portion of the outer surface of the object to be measured. Since the heat of the object to be measured is easily transferred to the case by selectively contacting according to the diameter, the heat of the object to be measured is easily transferred to the case, and the temperature detection sensitivity of the object to be measured is increased. This produces an excellent effect of being able to

In the present invention, at least two concave curved surface portions having different diameters are formed on the outer surface of the case, and one surface of at least two concave curved surface portions having different diameters on the outer surface of the case is connected to the cylindrical portion of the outer surface of the object to be measured. By selectively making contact with the diameter, the heat of the object to be measured is easily transferred to the case . For this reason, when attaching the temperature detector to the cylindrical portion having a small diameter on the outer surface of the object to be measured, the concave curved surface portion having a small diameter on the outer surface of the case is brought into contact with the cylindrical portion having a small diameter on the outer surface of the object to be measured. When attaching to a cylindrical portion having a large diameter, the concave curved surface portion having a large diameter on the outer surface of the case is attached in contact with the cylindrical portion having a large diameter on the outer surface of the object to be measured, whereby the heat of the object to be measured is easily transferred to the case. Therefore, the detection sensitivity of the temperature of the object to be measured can be increased.

  An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 3). The case 2 of the temperature indicator 1 is formed of a left main body 3 and a right main body 4 each having an outer shape of a substantially quadrangular prism and an inner shape, and the right end of the left main body 3 is press-fitted into the left end of the right main body 4. Fix it. On the outer surfaces of the left main body 3 and the right main body 4, flat portions 15 and 16 are formed on the upper surface and the right surface, respectively, and concave curved surface portions 17 and 18 are formed on the left surface and the lower surface. The flat portions 15 and 16 are used when attached to an object having a flat outer surface. The concave curved surface portion 17 has a shape that matches the outer surface of the trace pipe having a large diameter, and is used, for example, when it is attached to the trace pipe of 20A. The concave curved surface portion 18 has a shape coinciding with the outer surface of the trace pipe 19 having a small diameter, and is used, for example, when attached to the 8A trace pipe. 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 substantially triangular shape or a hexagonal shape, or in 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 portion 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 portion 13 having a U-shaped cross section is disposed on the other end (left end) side of the movable member 9. Is attached with a set screw 14.

  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 20 on the outer surface of the trace pipe 19 on the upstream side of the steam trap. The temperature responsive member 10 contracts when the temperature of the trace pipe 19 decreases and displaces the movable member 9 to the right, and expands when the temperature of the trace pipe 19 rises and displaces the movable member 9 to the left. When the steam trap operates normally and, for example, condensate below a set temperature of 65 to 75 degrees C. is automatically discharged, both the low temperature display portion 11 and the high temperature display portion 13 are immersed in the case 2. is doing. Thereby, it can confirm that a steam trap is normal. When the steam trap 15 is in a state of insufficient drainage or inability to drain, and the temperature becomes lower than a predetermined low temperature, for example, 60 ° C., the temperature responsive member 10 contracts and the movable member 9 is displaced in the right direction. 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 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 displaces to the left, and the low temperature display portion 11 2, the high temperature display unit 13 protrudes from the case 2. 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 FIG. 1 to trace piping. AA sectional drawing of FIG.

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, 16 Flat surface part 17, 18 Concave surface part 19 Trace piping 20 Adhesive tape

Claims (1)

A case attached to the object to be measured, a temperature responsive member housed in the case and contracted or expanded due to a temperature change of the object to be measured, and a case attached to the temperature responsive member in the axial direction of the case by the contraction or expansion of the temperature responsive member In the structure including a movable member that is displaced and a display unit that is attached to the movable member and protrudes outward or immerses inward from the case, at least two concave curved surface portions having different diameters are formed on the outer surface of the case. The surface of the object to be measured is selectively brought into contact with the diameter of the cylindrical part of the outer surface of the object to be measured so that the heat of the object to be measured is transmitted to the case. temperature indicator, characterized in that to facilitate.

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