JP4732160B2 - 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, a valve or a device for controlling these high-temperature fluids, and displays the temperature 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.

  A conventional temperature indicator 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 temperature responsive member attached to the temperature responsive member. Accordingly, the movable member is displaced in the axial direction of the case, and the display unit is attached to the movable member and protrudes outward or immerses inward with respect to the case.

In the conventional temperature indicator, since the accommodation chamber in the case for accommodating the temperature sensitive member is not sealed, the heat of the object to be measured transmitted to the case is transmitted to the temperature sensitive member through the air. For this reason, there is a problem that the heat of the object to be measured is not easily transmitted to the temperature sensitive member, and the temperature detection sensitivity of the object to be measured is 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 by making it easy for the heat of the object to be measured to be transmitted to the temperature sensitive member.

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 left partition that has 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 or immerses inwardly with respect to the case. And a right partition that has a right through hole in the center, and a movable member is disposed in the case through the left through hole and the right through hole. Between the left and right through holes in the movable member attaching the sealing means to keep the airtight, the accommodation chamber enclosed by the left and right partition walls of the case that houses the temperature responsive member is formed in a closed space, the sealed space is a good thermal conductivity gas than air Characterized in that it is entering.

In the present invention, a storage chamber surrounded by a left partition and a right partition in a case for storing a temperature responsive member is formed in a sealed space, and a gas having a thermal conductivity higher than air is sealed in the sealed space. Therefore, the heat of the object to be measured is easily transmitted to the temperature sensitive member, and an excellent effect that the temperature detection sensitivity of the object to be measured can be increased is produced.

In the present invention, a storage chamber surrounded by a left partition and a right partition in a case for storing a temperature responsive member is formed in a sealed space, and a gas having a thermal conductivity higher than air is sealed in the sealed space. . For example, helium can be used as the gas having better thermal conductivity than air. According to the present invention, the heat of the object to be measured transmitted to the case is quickly transmitted to the temperature responsive member via a gas having better thermal conductivity than air. 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 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 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. 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. O-rings 17 and 18 are attached to the movable member 9 as sealing means for maintaining airtightness between the through hole 5 and the through hole 7. 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 temperature responsive member 10 is accommodated in an accommodating chamber 19 as a sealed space surrounded by the partition walls 6 and 8 in the case 2. The storage chamber 19 is filled with helium having better thermal conductivity than air through the opening 20, and the opening 20 is sealed with a plug member 21.

  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, 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 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.

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 Bimetallic steam trap 19 Storage chamber 20 Opening 21 Plug member

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 a case having a movable member that is displaced and a display unit that is attached to the movable member and protrudes outward or immerses inwardly with respect to the case, the case has a left partition with a left through hole in the center and a right side in the center. A right partition that has a through hole is integrally formed, a movable member is disposed in the case through the left through hole and the right through hole, and the movable member is kept airtight between the left through hole and the right through hole. Install the sealing means, the housing chamber enclosed by the left and right partition walls of the case that houses the temperature responsive member is formed in a closed space, it is a good thermal conductivity gas than air is sealed in the closed space Temperature indicator according to claim Rukoto.

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