JP2001174444A - Ultrasonic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic transducer capable of bringing the overall end face of the transducer into contact with a material to be measured having various curvatures. SOLUTION: The ultrasonic transducer 8 is mounted on the outer surface of the bottom of vapor piping 1 in which a vapor to be measured flows by a sensor holder 2. An elastic member 8a made of a silicone rubber is adhered to the end in contact with the piping 1. The member 8a can be deformed to match the outer surface of the piping 1, and the overall end face can be brought into contact with the piping 1 having various curvatures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic transducer used for diagnosing an object to be measured by emitting an ultrasonic wave in contact with the object to be measured and receiving a reflected wave. The present invention relates to an ultrasonic transducer suitable for installation on an object to be measured having a curved portion.

[0002]

2. Description of the Related Art For example, JP-A-6-281492 discloses a technique for detecting a liquid level in a pipe by an ultrasonic transducer provided on an outer surface of the pipe. The technology disclosed here is such that an ultrasonic transducer is brought into contact with the lower surface of a horizontally provided pipe, emits ultrasonic waves upward, and is reflected from the surface of the water to return to the inside of the pipe. It detects the water level.

[0003]

The diameter of the pipe to be measured is various, and in the case of an ultrasonic transducer having a constant curvature at the tip end surface to be brought into contact with the pipe, the pipe is brought into contact with pipes having different pipe diameters. In such a case, the entire front end of the ultrasonic transducer cannot contact the pipe. Therefore, it is necessary to manufacture an ultrasonic transducer having a different curvature at the distal end surface for each pipe diameter, and there is a problem that the cost is increased.
Therefore, a technical problem of the present invention is to provide an ultrasonic transducer capable of bringing the entire front end of the ultrasonic transducer into contact with an object to be measured having various curvatures.

[0004]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is an ultrasonic transducer which emits an ultrasonic wave and receives a reflected wave by contacting an object to be measured. In the ultrasonic transducer, the elastic member is attached to the tip of the ultrasonic transducer to be brought into contact with the object to be measured.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ultrasonic transducer according to the present invention has an elastic member such as a synthetic resin or a synthetic rubber attached to a tip portion to be brought into contact with an object to be measured, and the elastic member has a surface shape of the object to be measured. Therefore, the entire front end can be brought into contact with an object to be measured having various curvatures.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2). The present embodiment is applied to a steam dryness measuring apparatus for measuring the dryness of steam by attaching the ultrasonic transducer of the present invention to a steam pipe,
FIG. 1 is a cross-sectional view in which an ultrasonic transducer is installed in a steam pipe, and FIG. 2 is a cross-sectional view along AA in FIG.

[0007] An ultrasonic transducer 8 is mounted on the outer surface of the bottom of the steam pipe 1 through which the steam to be measured flows down by the sensor holder 2 and connected to the control calculator 3. Steam piping 1
A pressure sensor 4 for detecting the pressure of the steam pipe 1 is attached to
Connected to the control computing unit 3. A temperature sensor may be attached to the steam pipe 1 instead of the pressure sensor 4, and the pressure of the steam pipe 1 may be obtained by the control calculator 3 from the detected temperature. When the pressure of the steam pipe 1 is known, the pressure may be directly input to the control calculator 3 without attaching a pressure sensor or a temperature sensor. The control calculator 3 receives the pressure of the steam pipe 1 detected by the pressure sensor 4 and stores in advance the relationship between the specific volume of saturated steam and saturated water and the steam pressure.

The ultrasonic transducer 8 is connected to the steam pipe 1
An elastic member 8a made of silicone rubber is adhered to a tip portion of the sensor holder 2 which is to be brought into contact with the sliding member 7 of the sensor holder 2. The sensor holder 2 includes a magnet 5 magnetically attracted to the steam pipe 1, a main body 6 fixed to the magnet 5, a sliding member 7 disposed in the main body 6, and a coil spring as an elastic member. 9.

In FIG. 2, the magnet 5 has a magnetic force releasing lever 10 on the left side surface and a groove 11 having a substantially V-shaped cross section on the upper surface.
And the main body 6 is fixed with four bolts 12. The sides of the groove 11 of the magnet 5 are flat, and two places surely come into contact regardless of the pipe diameter of the steam pipe 1.

The main body 6 has a through hole 13 as a sensor holding portion.
Having. The through hole 13 has a large diameter at the upper part and a small diameter at the lower part. The sliding member 7 is disposed so as to be able to slide up and down through the through hole 13. The sliding member 7 is shaped like a rod having a large diameter at the upper part and a small diameter at the lower part, and has an accommodation groove 14 for accommodating the lower part of the ultrasonic transducer 8 at the upper large diameter part.
The side wall of the housing groove 14 has a window 16 through which the connector 15 of the ultrasonic transducer 8 passes. The ultrasonic transducer 8 housed in the housing groove 14 is held by the snap ring 17. The main body 6 has a window hole 2 for preventing the connector unit 15 of the ultrasonic transducer 8 from moving up and down.
Has zero. Although the through hole 13 is illustrated as the sensor holding unit, the sensor holding unit may be formed by a groove that does not pass through.

A coil spring 9 is provided around the small diameter portion of the sliding member 7.
Place. The upper end of the coil spring 9 contacts the lower surface of the large-diameter portion of the sliding member 7, and the lower end contacts the step between the large-diameter portion and the small-diameter portion of the through hole 13. The transducer 8 is urged to the steam pipe 1. In FIG. 1, the right side surface of the small-diameter portion of the sliding member 7 is cut out, and the sliding member 7 is prevented from rotating by a bolt 18. Also, the sliding member 7 is prevented from being pulled out when turned upside down by the split pin 19 inserted at the lower end. Although the sliding member 7 is formed separately from the ultrasonic transducer 8,
It may be formed integrally with the ultrasonic transducer 8.

The control arithmetic unit 3 controls the ultrasonic transducer 8 at predetermined time intervals, emits ultrasonic waves upward from the bottom outer surface of the steam pipe 1, and returns the ultrasonic waves from the water surface until it is reflected by the water surface and returned. From the detected water level, the sectional area of the steam section and the sectional area of the drain section are calculated from the detected water level, and the unit length of the steam pipe 1 is calculated from the calculated sectional area of the steam section and the sectional area of the drain section. , The volume V1 of the steam and the volume V2 of the drain are calculated.

The arithmetic and control unit 3 calculates the steam weight M1 by multiplying the calculated steam volume V1 by the reciprocal of the specific volume of the saturated steam based on the pressure of the steam pipe 1, and calculates the calculated drainage M1. The volume V2 is multiplied by the reciprocal of the specific volume of the saturated water based on the pressure of the steam pipe 1 to calculate the weight M2 of the drain. From the calculated weight M1 of the steam and the weight M2 of the drain, the dryness X of the steam is calculated as M1 / (M1 + M2)
Is calculated and output.

The elastic member 8a made of silicone rubber adhered to the tip of the ultrasonic transducer 8 is deformed in accordance with the outer surface of the steam pipe 1, and the entire tip is formed by the steam pipe 1
In close contact with the outer surface of the

[0015]

As described above, since the ultrasonic transducer of the present invention has an elastic member such as a synthetic resin or a synthetic rubber attached to the tip to be brought into contact with the object to be measured, An excellent effect is obtained in that it can be deformed in accordance with the surface shape of the object, and the entire front end can be brought into contact with the object to be measured having various curvatures.

[Brief description of the drawings]

FIG. 1 is a sectional view in which an ultrasonic transducer of the present invention is attached to a steam pipe.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam piping 2 Sensor holder 3 Control arithmetic unit 4 Pressure sensor 5 Magnet 6 Main body 7 Sliding member 8 Ultrasonic transducer 8a Elastic member 9 Coil spring 11 V-shaped groove 13 Through hole

Claims (1)

[Claims] 1. An ultrasonic transducer for emitting ultrasonic waves and receiving reflected waves in contact with an object to be measured, wherein an elastic member is attached to a tip of the ultrasonic transducer to be in contact with the object to be measured. And ultrasonic transducer.