JPH0517626Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vibration meter for measuring vibrations of a machine, and particularly to a vibration sensor as a measuring element thereof.

[Prior Art] In general, vibration and temperature are considered to be important evaluation factors for abnormality detection in rotating machines. However, conventionally, the vibration of rotating machinery has been measured separately using a vibration meter, and the temperature has been measured separately using a thermometer.

[Problems to be solved by the invention] However, separately measuring vibration and temperature at the same location of a rotating machine is a troublesome and inefficient abnormality detection process.

An object of the present invention is to provide a vibration sensor that can measure vibration and temperature simultaneously.

[Means for Solving the Problems] The present invention forms a storage section opened on the measurement contact surface side in the casing of a vibration sensor that detects vibration by making surface contact with the object to be measured, and a storage section is formed in the storage section. A temperature measuring element made of a heat insulating material and having a built-in temperature sensor is provided, and this temperature measuring element is supported by an elastic body which is biased to protrude from the opening. The present invention is characterized in that a metal contact portion that makes surface contact with the object to be measured is provided, and the temperature sensor is provided inside the temperature probe in contact with the metal contact portion.

[Function] The temperature measuring probe is located within the storage section of the casing of the vibration sensor, and is configured such that its tip protrudes from the opening by the bias of an elastic body. When bringing the measurement contact surface of the vibration sensor casing into contact with an object to be measured such as a rotating machine, first the temperature probe is pressurized with an elastic body and comes into contact with the object to be measured, and then the casing of the vibration sensor is brought into contact with the object to be measured. Comes into contact with the object to be measured. Thereafter, the temperature probe and the casing of the vibration sensor are in constant contact with the object to be measured. The temperature of the object to be measured is transmitted to the metal contact portion at the tip of the temperature probe, and is measured by a temperature sensor inside the temperature probe.
In this case, the temperature probe is made of a heat insulating material and has a small heat capacity, so the temperature sensor has high responsiveness and can quickly measure temperature. On the other hand, the vibration of the object to be measured is measured by a vibration sensor. Therefore, vibration and temperature can be measured simultaneously by simply bringing the vibration sensor into contact with the object to be measured once.

[Example] Hereinafter, the present invention will be explained based on the illustrated example.

Reference numeral 1 is an acceleration-type vibrometer that applies the principle of forced vibration due to displacement, or more precisely, a vibration sensor as its measuring element. 3 forms the leg portion 2A. The leg portion 2A of the casing 2 is extended by a permanent magnet 4 attached to the bottom surface of the leg portion 2A, and constitutes a support base for the vibration meter.
Note that a normal metal member may be provided in place of the permanent magnet 4, or the leg portion 2A of the casing 2 itself may be extended.

In the recess 3 of the casing 2 extended by the permanent magnet 4, a temperature probe 5 having a built-in temperature sensor 8 is housed so as to be able to be pushed out and retracted, but not to be separated from the recess 3. That is, the recess 3 serves as a housing portion for the temperature probe. In order to enable the protruding and retracting operation while preventing this detachment, an outward flange 5a is formed at the base of the temperature measuring element 5 located within the recess 3.
An inward flange 2a is formed in the middle of the recess 3 to narrow the middle of the recess 3. Therefore, the temperature probe 5
can move up and down along the recess 3 until the inward flange 2a of the base comes into contact with the inward flange 2a of the recess 3. A spring (elastic body) 6 is provided between the base of the temperature probe 5 and the recess 3, and constantly applies an outward elastic force to the temperature probe 5. The length of the temperature probe 5 is the length of this spring 6.
The length is set so that the tip of the temperature probe 5 slightly protrudes from the recessed portion 3 extended by the permanent magnet 4 when the temperature probe 5 is pushed out to the maximum extent by the force. Therefore, when the permanent magnet 4 of the leg 2A of the casing 2 of the vibration sensor 1 is brought into contact with the flat surface of the object to be measured, the temperature probe 5 retreats into the recess 3 against the force of the spring 6, and the spring It is pressed against the flat surface of the object to be measured with a force of 6. The gap between the inward flange 2a of the recess 3 and the temperature probe 5 is maintained by a sealing member 7 provided at the tip of the inward flange 2a.
It is hermetically sealed so as not to inhibit the protruding and retracting operation of the temperature measuring element 5.

The temperature probe is made of heat insulating material (ceramics here) and has a metal contact portion 5 at its tip in order to reduce the heat capacity for temperature measurement and improve the responsiveness of temperature measurement.
b is provided in a plate shape. The purpose of making it plate-shaped is to increase the contact area. Inside the temperature sensor 5, a temperature sensor 8 consisting of a thermistor or the like is provided on the back side of the metal contact portion 5b at the tip, and its lead wire 9 passes through a small hole 5c inside the temperature sensor 5 to measure the temperature. It is pulled out from the base of the child 5, passes through the recess 3 in a coiled form, and is guided into the casing 2.
The small hole 5c of the temperature probe 5 is filled with a suitable filler made of a heat insulating material.

Vibration sensor 1 having a temperature sensor with the above configuration
is used in contact with a rotating machine 20 to be inspected, as illustrated in FIG. In this case, the vibration sensor 1 is connected to the rotating machine 2 by the action of the permanent magnet 4.
0 and held in that position, the metal contact portion 5b at the tip of the temperature measuring probe 5 is also pressed by the action of the spring 6 onto the rotating machine 20 and comes into surface contact with the rotating machine 20.

Therefore, the vibration of the rotating machine 20 is transmitted to the casing 2 of the vibration sensor via the permanent magnet 4, and according to the principle of forced vibration due to displacement, the input/output cable 1
1, an electrical signal of the vibration is extracted. On the other hand, the heat of the rotating machine 20 is transmitted to the metal contact portion 5b of the temperature probe 5 that is pressed against the rotary machine 20, and the temperature of the rotating machine 20 is sensed by the temperature sensor 8 inside the temperature probe 5. In this case, since the temperature probe 5 is made of a heat insulating material such as ceramics except for the metal contact portion 5b, the heat of the contact probe 5 is not diffused by thermal conduction, and the temperature can be measured quickly and accurately. be done. In addition, the metal contact portion 5b of the temperature probe 5 comes into contact with the rotating machine 20 immediately before the casing 2 of the vibration sensor comes into contact with the rotating machine 20, which speeds up the temperature rise, making it possible to sense the temperature without delaying the vibration sensing. . This temperature is also taken out as an electrical signal from the input/output cable 11.

These measured electrical signals of vibration and temperature are guided to the display device 12 and displayed on the display section 13 or recorded. This display device 12
can also be equipped with a vibration analyzer.

As mentioned above, since the temperature probe 5 is integrated into the vibration sensor 1, the vibration sensor 1 can be
Vibration and temperature can be measured by adsorbing or pressing the rotating machine 20 only once.
You can check for abnormalities. Therefore, compared to the case where vibration and temperature are measured using separate vibration meters and thermometers, the work efficiency is improved. Also, the second
Even when the object to be measured has a cylindrical surface like the rotating machine 20 shown in the figure, the temperature probe 5 sinks inside the recess 3 from the contact surface while remaining in contact with the object.
The permanent magnets 4 on both sides come into contact with the object to be measured. Therefore, both vibration sensing and temperature sensing are possible.

[Effect of the invention] Abnormality As mentioned above, the present invention integrates the temperature sensor into the vibration sensor of the vibration system, and each sensor comes into contact with the object to be measured independently. By bringing the sensors into contact with each other once, it is possible to simultaneously measure the vibration and temperature of the object to be measured. In addition, the temperature probe is made of a heat insulating material to lower its heat capacity and improve the rise in temperature at the metal contact portion, so it has excellent responsiveness to temperature and can quickly and accurately measure temperature. Furthermore, since the vibration sensor with the temperature sensor of the present invention has a relatively simple structure and can be constructed into a small measuring device, it can be managed and handled in the same way as the vibration sensor of a conventional portable vibration meter using a battery. It's easy.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a vibration sensor having a temperature sensor according to the present invention, and FIG. 2 is a diagram showing an example of its use. In the figure, 1 is a vibration sensor, 2 is a casing, 3 is a recess, 4 is a permanent magnet, 5 is a temperature probe, 5b is a metal contact part, 6 is a spring, and 8 is a temperature sensor.

Claims (1)

[Scope of utility model registration request] A casing of a vibration sensor that detects vibrations by making surface contact with an object to be measured is provided with a storage section opened on the measurement contact surface side, and a temperature probe made of a heat insulating material and containing a temperature sensor is provided within this storage section. At the same time, this temperature measuring element is supported by an elastic body urged to protrude from the opening, and a metal contact part is provided at the tip of the temperature measuring element projected from the opening to make surface contact with the object to be measured. A vibration sensor having a temperature sensor, characterized in that the temperature sensor is provided inside the temperature measuring element in contact with the metal contact portion.