JP2005037260A - Temperature indicator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To not only display a low temperature or a high temperature but also discriminate normality, low-temperature abnormality and high-temperature abnormality from one another. <P>SOLUTION: One end side located at the center side of a spiral bimetal 14 is fixed to a mount section 13 of an annular gasket 12 interposed between a lid body 2 in a bimetal type steam trap 1 and a cap 10 by welding. The spiral type bimetal 14 has an operation section 15 that is displaced to a low-temperature position, a medium-temperature one, and a high-temperature one at the other end side. The outer and upper sections of the spiral type bimetal 14 are covered in a heat-insulating case 16. The center section of an elastic member 17 made of a sheet of spring material nearly in a C shape is fixed by a screw 21 onto the inner periphery surface of the heat insulating case 16. A low-temperature-side window 19, where one end side of the low-temperature elastic member 17 enters and exists, is opened, and a high-temperature-side window 20, where the other end side of the elastic member 17 enters and exists, is opened at the peripheral wall of the heat-insulating case 16. <P>COPYRIGHT: (C)2005,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, 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 medium temperature at a predetermined temperature, but steam leaks at a temperature higher than the predetermined temperature. If the temperature is lower than the predetermined temperature, it can be estimated that the temperature is abnormal, that is, insufficient drainage or inability to drain.

  Conventional temperature indicators are made of a shape memory alloy and a thin plate is colored so that the front and back surfaces have different colors, so that the surface of the thin plate is deformed at high temperatures below the specified temperature so that the back surface 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 spiral bimetal whose one end on the center side is fixed to the object to be measured and whose other end is displaced to a low temperature position, a medium temperature position and a high temperature position, and a case where the low temperature side window and the high temperature side window are opened to cover the spiral bimetal And an elastic member that is fixed in the case and is partly displaced when the spiral bimetal is displaced to a low temperature position and the other part is displaced when the spiral bimetal is displaced to a high temperature position. When the other end side is displaced to the low temperature position, a part of the elastic member protrudes from the low temperature side window, and when the other end side of the spiral bimetal is displaced to the high temperature position, another part of the elastic member protrudes from the high temperature side window. It is characterized by that.

  Since this invention can confirm low temperature, medium temperature, and high temperature, it produces the outstanding effect that it can distinguish low temperature abnormality, such as insufficient drainage or drainage, normal, and high temperature abnormality, such as a steam leak.

  In the present invention, the other end of the spiral bimetal is displaced to a low temperature position, a medium temperature position, and a high temperature position. When the spiral bimetal is displaced to a low temperature position, a part of the elastic member protrudes from the low temperature side window and is elastic when displaced to the high temperature position. The other part of the member protrudes from the high temperature side window. Therefore, if a part of the elastic member protrudes from the low temperature side window, it can be confirmed that the temperature is lower than the predetermined temperature, and if another part of the elastic member protrudes from the high temperature side window, it is confirmed that the temperature is higher than the predetermined temperature. If the elastic member does not protrude from the low temperature side window and the high temperature side window, it can be confirmed that the temperature is medium.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). Reference numeral 1 is a bimetallic steam trap showing an example of a valve for controlling a high-temperature fluid. The bimetallic steam trap 1 has a bimetallic laminate 4 arranged in a casing formed by a main body 2 and a lid 3, drives a valve stem 5 with a bimetal that deforms according to the ambient temperature, and has an inlet 7 and an outlet 8. By opening and closing the valve port 9 communicating with the valve body 6 at the lower end of the valve rod 5, the condensate below a predetermined set temperature is automatically discharged. When changing the temperature of the condensate to be discharged, the cap 10 screwed to the outer periphery of the upper end of the lid 3 is removed, and the adjustment rod 11 screwed to the inner circumference of the lid 2 is displaced up and down.

  An annular gasket 12 interposed between the lid 2 and the cap 10 has an attachment portion 13 bent upward on the outer periphery. The attachment portion 13 is located on one side of the cap 10 and fixes one end side located on the center side of the spiral bimetal 14 by welding. The spiral bimetal 14 has an operation portion 15 that is bent outward in diameter at the other end. A heat insulating case 16 that covers the outer side and the upper side of the spiral bimetal 14 is sandwiched and fixed between the upper surface of the lid 2 and the lower surface of the hexagonal portion of the cap 10. A central portion of the elastic member 17 made by bending a thin plate spring material into a substantially C shape is fixed to the inner peripheral surface of the heat insulating case 16 with a screw 21. On the peripheral wall of the heat insulation case 16, a low temperature side window 19 is opened at one end of the elastic member 17, and a high temperature side window 20 is opened at the other end.

  When the bimetal steam trap 1 operates normally and condensate below a predetermined temperature is automatically discharged, the operation unit 15 of the spiral bimetal 14 has a low temperature side window 19 and a high temperature side window as shown in FIG. 20, the elastic member 17 does not protrude from the low temperature side window 19 and the high temperature side window 20. Thereby, it can confirm that it is normal. When the bimetallic steam trap 1 is leaking steam, the operation part 15 of the spiral bimetal 14 rotates about 50 degrees clockwise from the state shown in FIG. 2 and is displaced slightly to the right side of the high temperature side window 20. The other end side of the elastic member 17 is displaced outward and protrudes from the high temperature side window 20. Thereby, the high temperature abnormality which the steam is leaking can be confirmed. When the bimetal steam trap 1 is in a state where drainage is insufficient or impossible, the operation unit 15 of the spiral bimetal 14 rotates about 50 degrees counterclockwise from the state shown in FIG. The one end side of the elastic member 17 is displaced outward and protrudes from the low temperature side window 19. Thereby, the low temperature abnormality which is a state with insufficient drainage or inability to drain can be confirmed.

Sectional drawing which attached the temperature indicator of the Example of this invention to the bimetal type steam trap. AA sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bimetal type steam trap 2 Main body 3 Cover body 4 Bimetal laminated body 5 Valve rod 6 Valve body 7 Inlet 8 Outlet 9 Valve port 10 Cap 11 Adjustment rod 12 Gasket 13 Mounting part 14 Swirl type bimetal 15 Operation part 16 Thermal insulation case 17 Elastic member 19 Low temperature side window 20 High temperature side window

Claims (1)

A spiral bimetal whose one end on the center side is fixed to the object to be measured and whose other end is displaced to a low temperature position, a medium temperature position, and a high temperature position, a case where the low temperature side window and the high temperature side window are opened to cover the spiral type bimetal, And an elastic member that is partially displaced when the spiral bimetal is displaced to a low temperature position and that is partially displaced when the spiral bimetal is displaced to a high temperature position. A part of the elastic member protrudes from the low temperature side window when displaced to the position, and another part of the elastic member protrudes from the high temperature side window when the other end of the spiral bimetal is displaced to the high temperature position. Temperature indicator.

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