JP6415939B2 - Vibration detection device, vibration detection method, and abnormal sound detection device - Google Patents

Description

  The present invention relates to a vibration detection device, a vibration detection method, and an abnormal sound detection device.

  Conventionally, a vibration detection device is installed in a valve and leakage or the like is detected by measuring vibration of a pipeline. In such a case, it is necessary to efficiently transmit the vibration of the valve to the vibration detection device. As a method for this, for example, a magnet is provided in the lower part of the vibration detection device, and is closely attached to a valve made of a magnetic material such as iron.

  For example, Patent Document 1 (Japanese Patent Laid-Open No. 2005-214666) discloses a leak detection apparatus and method for detecting a leak of liquid sodium in a valve with high accuracy.

  In the leak detection apparatus and method described in Patent Document 1 (Japanese Patent Laid-Open No. 2005-214666), the leak detection apparatus detects a leak of liquid sodium in a valve that controls the flow of liquid sodium, and the liquid sodium leaks. Liquid sodium leak is detected by detecting the acoustic emission that sometimes occurs through a valve rod for opening and closing the flow path of the liquid sodium.

  Patent Document 2 (Japanese Patent Laid-Open No. 2006-84443) discloses a leak detection apparatus and method for accurately detecting a fluid leak in a valve.

  The leak detection device described in Patent Document 2 (Japanese Patent Laid-Open No. 2006-84443) is a leak detection device that detects a fluid leak in a valve provided in a pipe, and obtains acoustic emission generated inside the valve. An acquisition unit that analyzes the acoustic emission acquired by the acquisition unit and detects fluid leakage, and a temperature control unit that controls the temperature of the propagation path of the acoustic emission.

JP 2005-214666 A JP 2006-84443 A

In the technique of Patent Document 1, there is a problem that it takes time to fix. Moreover, in the technique of patent document 2, it describes that a vibration can be detected.
However, in the case of a small valve, there is no flat surface on which the vibration detection device can be stably installed. As a result, when the vibration detection device is placed on the peripheral edge away from the rotation axis of the handle, there is a problem that the vibration in the axial direction is attenuated in the handle and the transmission efficiency of the vibration is deteriorated.
Furthermore, when the valve is made of a resin or brass material, the vibration detection device cannot be attached using a magnetic force or the like.

  An object of the present invention is to provide a vibration detection device, a vibration detection method, and an abnormal sound detection device that can detect efficiently.

(1)
A vibration detection device according to one aspect is a vibration detection device that detects vibration from a valve having an axial center portion and a peripheral portion, and a vibration detection portion having a measurement surface for detecting vibration, and a measurement surface of the vibration detection portion. A plate-like portion supported in contact with the plate-like portion, and the plate-like portion further has a protrusion on the surface opposite to the mounting surface of the vibration detecting portion on the flat plate portion, and the protrusion is the shaft core of the valve It is configured to be able to contact the part.

In this case, the vibration of the valve is transmitted to the flat plate portion. And the vibration of a flat plate part can be detected by a vibration detection part.
In addition, the flat plate portion is placed in contact with the peripheral portion of the bulb and at a predetermined distance from the end portion of the shaft core portion, so that vibrations in a plurality of axial directions can be detected by the vibration detection unit. it can. In addition, since the protruding portion contacts the shaft core portion of the valve, vibration can be transmitted to the vibration detecting portion by the protruding portion.

(2)
The vibration detection device according to a second aspect of the present invention is the vibration detection device according to one aspect, wherein the flat plate portion may have a larger area than the measurement surface of the vibration detection unit.

  In this case, since the flat plate portion has a larger area than the measurement surface of the vibration detection unit, vibration can be reliably transmitted to the measurement surface of the vibration detection unit.

(3)
A vibration detection device according to a third aspect of the present invention is the vibration detection device according to one aspect or the second aspect, wherein the flat plate portion may be configured to be placed on the uppermost portion of the peripheral portion of the valve.

  In this case, since the flat plate portion is configured to be placed on the uppermost portion of the peripheral portion of the valve, vibration can be easily transmitted to the vibration detecting portion.

(4)
The vibration detection device according to a fourth aspect of the present invention is the vibration detection device according to the third aspect of the present invention from one aspect, wherein the plate-like portion may be placed on the outermost part of the peripheral portion of the valve.

  In this case, since the plate-like part is configured to be placed on the outermost part of the peripheral part of the valve, the vibration can be easily transmitted to the vibration detecting part.

(5)
The vibration detection device according to a fifth aspect of the present invention is the vibration detection device according to the fourth aspect of the present invention from the one aspect, wherein the protrusion may be composed of a rod-shaped member or a conical member.

  In this case, since the protrusion is made of a rod-shaped member or a cone-shaped member, the end of the rod-shaped member or the top of the cone-shaped member can be brought into contact with the shaft core portion of the valve, so that vibration can be reliably transmitted. it can.

(6)
The vibration detection device according to a sixth aspect of the present invention is the vibration detection device according to the fifth aspect of the present invention, wherein the flat plate portion may be formed of a metal plate having an elastic force.

  In this case, since the flat plate portion is made of a metal plate having an elastic force, it is possible to reduce self-damping and prevent the vibration detecting portion from being excessively bent.

(7)
A vibration detection method according to another aspect uses the vibration detection device according to any one of claims 1 to 6.

  In this case, vibration detection can be performed using a vibration detection device.

(8)
According to still another aspect of the invention, an abnormal sound detection device includes the vibration detection device according to any one of claims 1 to 7 and an analysis device that analyzes vibration from the vibration detection device.

  In this case, it is possible to reliably detect the vibration from the vibration detection device and to analyze the vibration with an analysis device to reliably detect the abnormal sound.

It is a schematic diagram for demonstrating the condition of the identification method of an abnormal sound generation position. It is a schematic diagram which shows an example of the abnormal sound detection apparatus containing a vibration detection apparatus. It is a schematic diagram which shows an example of the state which mounts the vibration detection apparatus of FIG. 2 on a valve | bulb. It is explanatory drawing for demonstrating an example of a vibration detection. It is explanatory drawing for demonstrating an example of a vibration detection. It is explanatory drawing for demonstrating an example of a vibration detection. It is a schematic diagram which shows an example of the vibration sensor jig | tool of a vibration detection apparatus. It is a schematic diagram which shows an example of the state which mounted the vibration detection apparatus in the valve | bulb.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<Situation explanation of the method for identifying the location of abnormal sound>
FIG. 1 is a schematic diagram for explaining a situation of a method for specifying an abnormal sound occurrence position.

As shown in FIG. 1, a pipe network 110 is provided in the ground. The pipe network 110 is provided with vertical holes (manholes) 120 at regular intervals. A valve 300 is provided in the vertical hole (manhole) 120.
In the present embodiment, vertical holes 120 are provided at intervals between point A and point B. In this case, the vibration detection device 200 is provided in each of the valves 300 of the vertical holes 120 at point A and point B in FIG.
As shown in FIG. 1, when water leakage occurs, the vibration of water leakage is transmitted from the pipe network 110 to the valve 300.

<Description of abnormal sound detection device>
FIG. 2 is a schematic diagram illustrating an example of the abnormal sound detection device 100 including the vibration detection device 200.

  As shown in FIG. 2, the abnormal sound detection device 100 according to the present embodiment includes an arithmetic device 400 and a vibration detection device 200. The vibration detection device 200 mainly includes a vibration sensor 210 and a vibration sensor jig 220. In the present embodiment, vibration sensor 210 is uniaxial detection.

  As shown in FIG. 2, the arithmetic device 400 receives a signal from the vibration detection device 200 and calculates the occurrence position of the abnormal sound.

<Description of vibration detection device>
FIG. 3 is a schematic diagram showing an example of a state in which the vibration detection device 200 of FIG.

As shown in FIG. 3, the valve 300 includes an axial core part 310 and a handle part 320.
The vibration sensor jig 220 includes a flat plate portion 221 and a protruding portion 222. As shown in FIG. 3, the flat plate portion 221 has an outer diameter L2 that is larger than the outermost diameter L3 when the handle portion 320 of the valve 300 is viewed from above.
In addition, a protrusion 222 is provided in the center of the flat plate portion 221 and in the vertical direction of the flat plate portion 221. In the present embodiment, the protrusion 222 is made of a rod-shaped member.

As shown in FIG. 3, the vibration sensor 210 is mounted on the vibration sensor jig 220.
Then, the flat plate portion 221 is placed on the handle portion 320 of the valve 300.
In this case, the protruding portion 222 protruding from the flat plate portion 221 of the vibration sensor jig 220 contacts the shaft core portion 310 of the valve 300.

The vibration sensor jig 220 according to the present embodiment is made of spring steel. The thickness t of the spring steel is in the range of 0.2 mm to 2 mm.
In this embodiment, it is made of spring steel. However, the present invention is not limited to this, and there is little self-damping of vibration, it is easily elastically deformed in the direction of the shaft core portion 310, is deformed flexibly, and is a vibration sensor. Any other member may be used as long as the member does not bend excessively with a weight of 210.

(Explanation of vibration detection)
Next, FIGS. 4, 5 and 6 are explanatory diagrams for explaining an example of vibration detection.
4 and 5 show an example of horizontal vibration detection, and FIG. 6 shows an example of vertical vibration detection.

First, as shown in FIGS. 4 and 5, in the handle portion 320, the flat plate portion 221 of the vibration sensor jig 220 causes the horizontal vibration HV of the handle portion 320 to vibrate in the vertical direction at the central portion of the flat plate portion 221. Change to VV.
As a result, the vibration HV in the horizontal direction of the handle portion 320 can be detected by the vibration sensor 210 after being converted into the direction of the axial core portion 310 (in the present embodiment, the vertical direction).

  Next, as shown in FIG. 6, the vibration V <b> 1 in the vertical direction of the shaft core portion 310 can be detected by the vibration sensor 210 as the vibration VV through the protruding portion 222 and the flat plate portion 221.

As described above, the general valve 300 has a shape in which the shaft core portion 310 is recessed with respect to the handle portion 320. Therefore, particularly in the small-diameter valve 300, it is difficult to directly contact the vibration sensor 210 having a large area with the shaft core portion 310 because the handle portion 320 is obstructed.
On the other hand, in the abnormal sound detection device 100 and the vibration detection device 200 according to the present embodiment, the protrusion 222 can come into contact with the shaft core portion 310 by the vibration sensor jig 220 of the vibration detection device 200.

Vibrations detected by the respective vibration sensors 210 at point A and point B shown in FIG. 1 are given to the arithmetic device 400, and arithmetic processing is performed by the arithmetic device 400.
The arithmetic device 400 performs frequency filter processing, cross-correlation function calculation processing, and the like based on the measured signal, and calculates the position of vibration detected by the vibration sensor 210. As a result, the leak location shown in FIG. 1, that is, the abnormal sound (water leak position) can be identified.

(Second Embodiment)
Next, a second embodiment will be described. The abnormal sound detection device 100a (not shown) and the vibration detection device 200a according to the second embodiment are different from the abnormal sound detection device 100 and the vibration detection device 200 according to the first embodiment in that the vibration This is a sensor jig 220a.

  FIG. 7 is a schematic diagram illustrating an example of the vibration sensor jig 220a of the vibration detection device 200a, and FIG. 8 is a schematic diagram illustrating an example of a state in which the vibration detection device 200a is placed on the valve 300.

As shown in FIG. 7, the vibration sensor jig 220a includes a flat plate portion 221 and a protruding portion 222a. The protrusion 222a according to the second embodiment has an inverted conical shape.
And as shown in FIG. 8, the vibration sensor 210 is attached on the vibration sensor jig | tool 220a.
Then, the flat plate portion 221 is placed on the handle portion 320 of the valve 300.
In this case, the top of the inverted cone of the protruding portion 222 a protruding from the flat plate portion 221 of the vibration sensor jig 220 a contacts the shaft core portion 310 of the valve 300.

<Example>
Example 1
The vibration detection device 200 in the first embodiment is formed.
The vibration sensor jig 220 and the vibration sensor 210 were screwed in advance.
The vibration sensor jig 220 and the valve 300 were merely placed without being fixed. The vibration sensor jig 220 was made of spring steel having a thickness of 0.6 mm.
(Example 2)
The vibration detection device 200a according to the second embodiment is formed.
The vibration sensor jig 220a and the vibration sensor 210 were screwed in advance. The vibration sensor jig 220a and the valve 300 are merely placed without being fixed. The vibration sensor jig 220a is made of spring steel having a thickness of 0.6 mm.
(Comparative Example 1)
The vibration sensor 210 was placed on the valve 300.

In the first and second embodiments, the vibration detectors 200 and 200a can be easily and stably placed even in the handle portion 320 of the small valve 300, and vibrations can be reliably detected. It was.
On the other hand, in the comparative example, the vibration sensor 210 could not be stably placed.

As described above, in the abnormal sound detection devices 100 and 100a and the vibration detection devices 200 and 200a according to the present invention, the vibration of the valve 300 is transmitted to the flat plate portion 221. The vibration of the flat plate portion 221 can be detected by the vibration sensor 210.
Further, since the flat plate portion 221 is in contact with the handle portion 320 of the valve 300 and the protruding portions 222 and 222a are in contact with the shaft core portion 310, any vibration in the horizontal direction or the vertical direction is detected by the vibration sensor 210. can do.

  Further, since the flat plate portion 221 has a larger area than the measurement surface of the vibration sensor 210 and is configured to be placed on the uppermost portion of the handle portion 320 of the valve 300, the flat plate portion 221 can be reliably placed on the measurement surface of the vibration sensor 210. Vibration can be transmitted.

  Further, since the flat plate portion 221 is configured to be placed on the outermost part of the handle portion 320 of the valve 300, vibration can be easily transmitted to the vibration sensor 210.

  Further, since the protrusions 222 and 222a are made of a rod-shaped member or a cone-shaped member, the end of the rod-shaped member or the top of the cone-shaped member can be brought into contact with the shaft core portion 310 of the valve 300. Can be transmitted.

  In addition, in the abnormal sound detection devices 100 and 100a, vibration from the vibration detection devices 200 and 200a can be detected reliably, and the vibration can be analyzed by the arithmetic device 400 to reliably detect abnormal sound.

  The method for specifying the abnormal sound generation position can be applied to various pipe networks 110. For example, in addition to detecting leaks from water supply pipes, it is also used for detecting leaks in various pipes other than water supply, or for detecting leakage of fluids such as chemicals in pipes for chemicals in factories. be able to.

  In the present invention, the shaft core portion 310 corresponds to the “shaft core portion”, the handle portion 320 corresponds to the “peripheral portion”, the valve 300 corresponds to the “valve”, and the vibration detection devices 200 and 200a correspond to “vibration”. The vibration sensor 210 corresponds to the “vibration detection unit”, the vibration sensor jigs 220 and 220a correspond to the “plate portion”, the flat plate portion 221 corresponds to the “flat plate portion”, and protrudes. The units 222 and 222a correspond to “projections”, the abnormal sound detection devices 100 and 100a correspond to “abnormal sound detection devices”, and the arithmetic device 400 corresponds to “analysis device”.

  A preferred embodiment of the present invention is as described above, but the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

DESCRIPTION OF SYMBOLS 100,100a Abnormal sound detection apparatus 200,200a Vibration detection apparatus 210 Vibration sensor 220,220a Vibration sensor jig 221 Flat plate part 222,222a Protrusion part 300 Valve 310 Axis core part 320 Handle part 400 Arithmetic unit

Claims (7)

In a vibration detection device that detects vibration from a valve having a shaft core part and a peripheral part,
A vibration detector having a measurement surface for detecting vibration;
A plate-like portion supported in contact with the measurement surface of the vibration detection unit,
The plate portion includes a flat plate portion, and a protruding portion provided on a surface of the mounting surface and opposite side of addition the vibration detection portion to the flat portion,
The flat plate portion is placed on a peripheral portion of the valve,
The protrusions can contact a configured axial portion of the valve,
It said plate includes vibration sensing device that consists of an elastically deformable member in the axial core portion direction.   The vibration detection apparatus according to claim 1, wherein the flat plate portion of the plate-like portion has an area larger than a measurement surface of the vibration detection unit. The plate portion is configured to be placed on the outermost periphery of the valve, the vibration detecting device according to claim 1 or 2. The protrusion is formed of a rod-like member or cone-shaped member, the vibration detecting device according to any one of claims 1 to 3. Said plate is composed of a metal plate having elasticity, the vibration detecting device according to any one of claims 1 to 4. The vibration detection method using the vibration detection apparatus of any one of Claims 1-5 . The vibration detection device according to any one of claims 1 to 5 ,
An abnormal sound detection device comprising: an analysis device that analyzes vibration from the vibration detection device.

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