JP2008151584A - Temperature indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature indicator for eliminating a slide resistance in a movable member, and sensitively detecting a temperature of an object to be measured. <P>SOLUTION: The temperature indicator 1 comprises: a case 2 attached to the object to be measured; a temperature reaction member 15 attached to the case 2 at one end, and contracted or expanded due to a temperature change; the movable member 9 attached to the other end of the temperature reaction member 15, and displaced in the direction of the center of an axis of the case 2 due to a contraction or an expansion of the temperature reaction member 15; a low temperature indicating section 16 attached to one end of the movable member 9, and protruded from the case 2 when the temperature is a predetermined low temperature or less; a high temperature indicating section 18 attached to the other end of the movable member 9, and protruded from the case 2 when the temperature is a predetermined high temperature or more; a thin plate diaphragm 7 fixed to the case 2 on an outer circumference, and fixed to one end of the movable member 9 on an inner circumference; and a thin plate diaphragm 8 fixed to the case 2 on an outer circumference, and fixed to the other end of the movable member 9 on an inner circumference. The movable member 9 is guided by the diaphragms 7, 8 in the direction of the center of the axis of the case 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

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.

  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 slidably displaced in the axial direction of the case, and the display unit is attached to the movable member and protrudes outward from or intrudes into the case.

In the conventional temperature indicator described above, when foreign matter such as dust or scale is caught in the sliding part between the case and the movable member, the sliding resistance of the movable member increases, and the temperature detection sensitivity of the object to be measured is increased. There was a problem that it decreased.
JP-A-2005-300458

  The problem to be solved is to provide a temperature indicator that eliminates the sliding resistance of the movable member and has high detection sensitivity of the temperature of the object to be measured.

  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 or immerses inwardly with respect to the case. A fixed thin plate-like diaphragm is disposed on one end side and the other end side of the movable member, and the movable member is guided in the axial direction of the case.

  The present invention can eliminate the sliding portion between the case and the movable member by guiding the movable member in the axial direction of the case with the diaphragms arranged on one end side and the other end side of the movable member. This produces an excellent effect that the temperature detection sensitivity of the object to be measured can be increased.

  In the present invention, a thin plate-like diaphragm having an outer periphery fixed to a case and an inner periphery fixed to a movable member is disposed on one end side and the other end side of the movable member, and the movable member is guided in the axial direction of the case. . Therefore, the sliding part between the case and the movable member can be eliminated, the sliding resistance of the movable member can be eliminated, and the temperature detection sensitivity 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 end body 3, a left middle body 4, a right middle body 5, and a right end body 6, each having a substantially quadrangular outer shape and a cylindrical inner shape. Press-fit into the left end of the left middle main body 4, press the right end of the left middle main body 4 into the left end of the right middle main body 5, and press fit the right end of the right middle main body 5 into the left end of the right end main body 6 and fix it. . The outer periphery of the diaphragm 7 is sandwiched between the left end main body 3 and the left middle main body 4, and the outer periphery of the diaphragm 8 is sandwiched between the right middle main body 5 and the right end main body 6. The left end main body 3, the left middle main body 4, the right middle main body 5 and the right end main body 6 are made of aluminum having a high thermal conductivity. The left end main body 3, the left middle main body 4, the right middle main body 5, and the right end main body 6 may be formed in a polygonal shape such as a substantially triangular shape or a hexagonal shape, or in a cylindrical shape.

  The movable member 9 is formed of a left member 10, a middle member 11, and a right member 12, the right end portion of the left member 10 is press-fitted into the left end portion of the middle member 11, and the right end portion of the middle member 11 is left end portion of the right member 12. Press fit into and fix. The inner periphery of the diaphragm 7 is sandwiched between the left member 10 and the middle member 11, and the inner periphery of the diaphragm 8 is sandwiched between the middle member 11 and the right member 12. The diaphragm 7 disposed on one end (left end) side of the movable member 9 and the diaphragm 8 disposed on the other end (right end) side of the movable member 9 are formed in a thin plate shape with resin or rubber, and the movable member 9 is formed on the case 2. Guide in the axial direction. The right middle main body 5 integrally includes a partition wall 14 having a through-hole 13 through which the movable member 9 passes in the center. One end (right end) side of the temperature responsive member 15 made of bimetal is attached to the partition wall 14 of the right middle main body 5 by welding. The other end (left end) side of the temperature responsive member 15 is welded to the substantially central portion of the movable member 9. A cold display section 16 having a U-shaped cross section is attached to one end (right end) side of the movable member 9 with a set screw 17, and a high temperature display section 18 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 19.

  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.

  This temperature indicator 1 is attached to, for example, an adhesive tape 21 on the outer surface of, for example, a bimetallic steam trap 20 as an object to be measured. The temperature responsive member 15 contracts when the temperature of the bimetal steam trap 20 decreases and displaces the movable member 9 to the right, and expands when the temperature of the bimetal steam trap 20 increases and displaces the movable member 9 to the left. . When the bimetal steam trap 20 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 16 and the high temperature display portion 18 are in the case 2. I'm immersed in it. Thereby, it can confirm that it is normal. When the bimetal steam trap 20 is in a state of insufficient drainage or inability to drain, the temperature responsive member 15 contracts and the movable member 9 is displaced to the right, and the high temperature display 18 is in the case 2 Although being immersed, the low temperature display portion 16 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 20 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 15 expands and the movable member 9 is displaced leftward. Is immersed in the case 2, but the high temperature display portion 18 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 7, 8 Diaphragm 9 Movable member 15 Temperature response member 16 Low temperature display part 18 High temperature display part 20 Bimetal type steam trap

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 A thin plate with an outer periphery fixed to the case and an inner periphery fixed to the movable member with a movable member that displaces and a display unit that is attached to the movable member and protrudes outward or immerses inwardly with respect to the case A temperature indicator characterized in that the diaphragm is arranged on one end side and the other end side of the movable member to guide the movable member in the axial direction of the case.

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