JPH0526503Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a vibration meter used to detect vibrations accompanying the operation of a valve such as a steam trap or vibrations of a rotating shaft to check whether the operation is good or not.

Prior Art A conventional vibration meter was first proposed by Jitsuganaki.
This will be explained with reference to No. 62-3873.

A detection needle that presses one end against the object to be detected is attached to the probe casing, the vibrations transmitted through the detection needle are converted into electrical signals by a microphone, and the electrical signals are amplified by an amplifier. The microphone is attached to the casing via an elastic member such as rubber. The amplifier is connected to the terminals of the microphone by soldering.

Problems to be Solved by the Present Invention The above method has a problem of poor vibration detection accuracy. That is, since the terminals of the microphone are directly connected to the amplifier by soldering, the amplifier may be attached to the microphone in an inclined state, and the amplifier may be in contact with the casing of the probe. In this case, mechanical vibrations from the casing are transmitted to the microphone via the amplifier, making it impossible to detect vibrations only from the detection needle. Further, since the vibration from the detection needle is received while the microphone is vibrating, the accuracy of vibration detection is reduced.

Therefore, the technical problem of the present invention is to make it difficult for mechanical vibrations from the casing to be transmitted to the microphone via the amplifier.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to attach a detection needle that presses one end against the object to be detected to the casing, and to A microphone that converts mechanical vibrations into electrical signals is placed inside the casing at the other end of the detection needle, and an amplifier that amplifies the electrical signals of the microphone is connected to the microphone and placed inside the casing. In a vibration meter, a microphone and an amplifier are attached to a casing via an elastic member such as rubber.

Effect The operation of the above technical means is as follows.

Since the microphone is attached to the casing via an elastic member such as rubber, vibrations from the casing are not transmitted. In addition, the amplifier is also attached to the casing via an elastic member such as rubber.
No vibrations from the casing are transmitted, and no vibrations from the casing are transmitted to the microphone via the amplifier. Therefore, the microphone can accurately and sensitively receive only the vibrations from the detection needle. Furthermore, since the microphone does not receive vibrations from the detection needle while it is vibrating, the accuracy of vibration detection is improved.

Effect of invention The present invention produces the following specific effects.

As mentioned above, according to the present invention, the microphone can only receive vibrations from the detection needle, and the microphone does not receive vibrations from the detection needle while vibrating, so the vibration detection accuracy is will improve.

Example An example showing a specific example of the present invention will be explained (first example).
(see Figure and Figure 2).

The overall configuration of the vibration meter is a detector 1, a calculation device 50,
It also consists of a cable 51 that connects the two. The detector 1 includes a detection needle 2, a detection needle holding member 4, and a front cover 6 that connects the detection needle holding member 4 and the main body 5.
and a rear cap 7 having a cable outlet 25.

A diaphragm mounting member 11 is provided in the approximately cylindrical internal space formed by the front cover 6 and the main body 5.
a spring holder 19 that connects the holding plate 15 and the microphone holder 18 that holds the ultrasonic microphone 16 via an elastic member 17 such as rubber, and a printed circuit that amplifies the detection signal. A board mounting member 3 to which the board 20 is attached is arranged.

The detection needle holding member 4 has a conical upper half and a cylindrical lower half. A penetrating vertical hole 9 is made in the center, and the detection needle 2 is placed inside. An elastic member 32 such as rubber is interposed between the detection needle 2 and the detection needle holding member 4. The detection needle 2 slides within the detection needle holding member 4 until the tip of the detection needle holding member 4 comes into contact with the surface of the object to be detected. The detection needle 2 has a substantially cylindrical shape, and is formed by arranging the temperature sensor 10 at one end and press-fitting the other end into the diaphragm mounting member 11. The conductor from the temperature sensor 10 is passed through a conductor hole 12 provided halfway in the center of the detection needle 2, a vertical hole 9 of the detection needle holding member 4, a holding plate 15, and a spring holder 1.
9. A wire is connected inside the printed circuit board 20 through the communication hole 14 that communicates the microphone holder 18 and the board mounting member 3.

The diaphragm 21 is screwed onto one end of the diaphragm mounting member 11. An elastic member 33 made of rubber or the like is interposed between the diaphragm mounting member 11 and the spring holder 19. An ultrasonic microphone 16 is placed facing the diaphragm 21. The pins of the ultrasonic microphone 16 are connected into the printed circuit board 20. The spring holder 19 has a cylindrical space inside, and a coil spring 22 is disposed therein to maintain a constant pressing force of the detection needle 2 against the object to be detected. An elastic member 34 such as rubber is provided between the spring holder 19 and the main body 5 and between the microphone holder 18 and the main body 5.
and 35 are interposed.

A micro switch 31 is attached to the holding plate 15. An elastic member 36 such as rubber is interposed between the holding plate 15 and the front cap 6. The conductive wire from the micro switch 31 is connected inside the printed circuit board 20. The micro switch 31 is turned on when the distance from the diaphragm mounting member 11 exceeds a certain value, and is turned off when the distance from the diaphragm mounting member 11 becomes less than a certain value. This distance is the detection needle 2
This is the position where the tip of the detection needle holding member 4 has been pushed into the tip. The holding plate 15, spring holder 19, and microphone holder 18 are coupled with screws 23.

Elastic members 37 and 38, such as rubber, are interposed between the board mounting member and the main body 5 and rear cap 7.

The calculation device 50 is a printed circuit board 20 inside the detector 1.
A functional unit that performs arithmetic processing on each signal sent from
It consists of a display section, etc.

The entire device operates as follows. When the temperature sensor 10 at the tip of the detector 1 is pressed against the object to be detected, the detection needle 2 is pushed to the tip of the detection needle holding member 4 against the biasing force of the coil spring 22.
At this position, the micro switch 31 is turned on, and the arithmetic unit 50 enters the measurement start state.

A temperature signal from the temperature sensor 10 is directly transmitted to the arithmetic unit 50 through the conductor, and at the same time, mechanical vibrations are transmitted to the diaphragm mounting member 11 through the detection needle 2, causing the diaphragm 21 to vibrate. The vibration of the diaphragm 21 propagates through the space inside the microphone holder 18 and is transmitted to the facing ultrasonic microphone 16, and is sent as a vibration signal to the arithmetic unit 50 through the printed circuit board 20.

[Brief explanation of drawings]

Figure 1 is a block diagram of the present invention and a cross-sectional view of the detector.
FIG. 2 is a sectional view taken along the line -- in FIG. 1. 1...Detector, 2...Detection needle, 3...Board mounting member, 5...Main body, 16...Ultrasonic microphone, 18...Microphone holder, 20...Printed circuit board, 21...Vibration plate, 35, 37, 38...Elastic member, 50... Arithmetic device.

Claims (1)

[Scope of utility model registration request] A detection needle that presses one end against the object to be detected is attached to the casing, and a microphone that converts the mechanical vibration of the object to be detected transmitted through the detection needle into an electrical signal is attached to the casing.
In a vibrometer, an amplifier is placed inside the casing at the other end of the detection needle, and an amplifier for amplifying the electrical signal of the microphone is connected to the microphone and placed inside the casing. A vibration meter attached to the casing via a member.