JP2008096348A - Vibrometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the breakage of the tip of a detection needle even when a vibrometer is accidentally or carelessly dropped or hit against an object. <P>SOLUTION: The casing of this vibrometer is formed of a body 1 and a cap 3 fixed on the rear end of the body 1. A detection needle 4 is attached axially displaceably, and a shape memory alloy 13 as a temperature reaction member is connected to the detection needle 4. The tip of the detection needle 4 to be pressed onto a detection object by the deformation of the shape memory alloy 13 is immersed into the body 1 at a low temperature, or projected from an opening 14 of the body 1 at a high temperature. By pressing the opening 14 of the body 1 onto the detection object, the tip of the detection needle 4 is pressed onto the detection object by the deformation of the shape memory alloy 13 due to heat at a high temperature time of the detection object. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibrometer that is used to detect whether vibration is caused by the operation of a high-temperature valve such as a steam trap, and confirms whether the operation is good or not. It relates to what was made.

  In a conventional vibrometer in which the detection needle is pressed against the object to be detected with a desired force, the detection needle is attached to the casing so as to be displaceable in the axial direction, and the detection needle is urged against the object by a spring. The tip of the detection needle to be contacted is projected from the opening of the casing, and the tip of the detection needle is pressed against the object to be detected and pushed to the opening of the casing, thereby compressing the spring by a certain amount.

In the conventional vibrometer described above, the tip of the detection needle protrudes from the opening of the casing when the detection needle is not pressed against the object to be detected such as when it is being carried. In some cases, the tip of the detection needle is damaged.
Japanese Utility Model Publication No. 6-37303

  The problem to be solved is to provide a vibrometer that does not damage the tip of the detection needle even if it is accidentally dropped or applied to an object.

  In the present invention, a detection needle is attached to a casing so as to be axially displaceable, a temperature responsive member is connected to the detection needle, and the tip of the detection needle pressed against an object to be detected by deformation of the temperature responsive member is placed in the casing at a low temperature. The tip of the detection needle is detected by the deformation of the temperature-responsive member due to heat at the high temperature of the detection object by pressing the casing opening against the detection object. It is characterized by being pressed against an object.

  In the present invention, the tip of the detection needle is immersed in the casing due to the deformation of the temperature responsive member at a low temperature when the object is not pressed against the object to be detected. Therefore, an excellent effect is obtained that the tip of the detection needle is not damaged even if it is accidentally dropped or applied to an object.

  The vibrometer of the present invention is configured such that the tip of a detection needle pressed against an object to be detected by deformation of a temperature sensitive member is immersed in the casing at a low temperature and protrudes from the opening of the casing at a high temperature. By pressing against the detection object, the tip of the detection needle is pressed against the detection object due to deformation of the temperature responsive member due to heat at a high temperature of the detection object. For this reason, the tip of the detection needle is immersed in the casing due to deformation of the temperature responsive member at a low temperature when it is not pressed against the object to be detected such as when it is carried. Therefore, the tip of the detection needle is not damaged even if it is accidentally dropped or applied to an object.

  An embodiment showing a specific example of the above technical means will be described (see FIG. 1). The casing of the vibrometer is formed from a main body 1 and a cap 3 fixed to the rear end of the main body 1. A detection needle 4 is disposed in the main body 1 so as to be displaceable in the axial direction. The vibration sensing element 5 is fixed to the rear end of the detection needle 4. The vibration sensing element 5 has a vibration transmission plate 6 screwed to the rear end of the detection needle 4, and an electrode plate 7, a piezoelectric element 8, an electrode plate 9, a weight 10, and a vibration isolation rubber 11 are inserted and fixed with a nut 12. Is. Between the anti-vibration rubber 11 and the cap 3, a coil-shaped shape memory alloy 13 is disposed as a temperature responsive member. One end of the shape memory alloy 13 is fixed to the anti-vibration rubber 11 and the other end is fixed to the cap 3. The shape memory alloy 13 is deformed according to the temperature, and if it is a predetermined temperature, for example, 60 degrees or less, it is transformed from the parent phase to the martensite phase and deformed into a short shape that is preliminarily contracted and memorized. The tip is immersed in the main body 1 and when it reaches a predetermined temperature or more, it has a long shape that is reversely transformed from the martensite phase to the parent phase and memorized, and the tip of the detection needle 4 protrudes from the opening 14 of the main body 1. Let The voltage fluctuation detected by the vibration sensing element 5 is sent to a determination device (not shown) by the cable 16 or wireless transmission means.

  Next, the operation of the vibrometer of the present embodiment will be described. The shape memory alloy 13 is deformed into a short shape at a low temperature when it is not pressed against an object to be detected such as when being carried, and the tip of the detection needle 4 is immersed in the main body 1. Therefore, the tip of the detection needle 4 is not damaged even if it is accidentally dropped or applied to an object. When the opening 14 of the main body 1 is pressed against a steam trap as an object to be detected, the shape memory alloy 13 is deformed into a long shape by the heat of the steam trap, and the tip of the detection needle 4 is pressed against the steam trap with a desired force. The vibration of the steam trap is transmitted to the vibration transmission plate 6 through the detection needle 4 and acts on the piezoelectric element 8 as a pressure fluctuation to cause a voltage fluctuation. This voltage fluctuation is sent from the electrode plates 7 and 9 to the determiner via the cable 16, and the determiner determines whether the steam trap is operating properly.

Sectional drawing of the vibrometer of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 3 Cap 4 Detection needle 5 Vibration sensing element 7 Piezoelectric element 13 Shape memory alloy 14 Opening of main body

Claims (1)

The detection needle is attached to the casing so that it can be displaced in the axial direction, and a temperature-responsive member is connected to the detection needle, and the tip of the detection needle that presses against the object to be detected by deformation of the temperature-responsive member is immersed in the casing at low temperatures. The tip of the detection needle is pressed against the object to be detected by the deformation of the temperature-responsive member due to the heat at the time of the object being detected at high temperatures by pressing the casing opening against the object to be detected. Vibration meter characterized by being able to.

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