JPH0518695Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to an ultrasonic flaw detection device for tubes, and in particular, it includes a probe that transmits ultrasonic waves in the axial direction of a tube to be inspected, and A water tank having a rotating mirror that reflects ultrasonic waves from a probe onto the wall of a test tube, and a turbine that is integrally coupled with the mirror and rotates the mirror concentrically with the axis of the test tube. This article relates to an immersion-type tube ultrasonic flaw detection device.

[Conventional technology] As a water immersion ultrasonic flaw detection device that detects flaws on the inner surface of a metal tube, ultrasonic pulses emitted from a probe in the tube axis direction of the test tube are transmitted using a mirror that rotates concentrically with the tube axis. There is a known configuration in which the echo waves are reflected onto the tube wall of the test tube, and then the echo waves from the tube wall are reflected by the mirror and received by the probe (for example, as disclosed in Japanese Patent Application Laid-Open No. Publication No. 60-205254).
In this device, in order to rotate the mirror, the mirror is integrally fixed to a rotating cylindrical body equipped with a turbine, and this rotating cylindrical body has a bearing between the turbine and the mirror. is mounted within the housing via the The flow of water that powered the turbine passed through an opening in the rotating cylinder and the bearing between the turbine and the bearing. Further, the water passing through the housing is configured to flow out only from an ultrasonic wave transmission hole provided in the rotating cylinder so as not to obstruct the passage of ultrasonic waves reflected by the rotating mirror. Ta.

[Problems to be solved by the invention] In the conventional device as described above, the flow of water that activated the turbine flows in both directions through the opening of the rotating cylindrical body provided between the turbine and the bearing and inside the bearing. As the bearing is divided into two parts, the force applied to the turbine is divided into two parts, resulting in poor rotational efficiency, and the bearings are easily clogged with debris, which can cause uneven rotation of the turbine, and furthermore,
There were problems such as damage to the bearing, resulting in a decrease in measurement accuracy or inability to perform measurements.

Furthermore, since the water in the housing flows out only through the hole at the top of the rotating mirror, there is also a problem in that the efficiency of the turbine decreases due to the reaction of this flowing water.

Furthermore, the water flowing out from the hole is tilted at 45 degrees with respect to the tube axis, and the water flows out along the mirror, so a vortex is generated in the center of the hole, and the water in the water is There was also the problem that air bubbles and impurities stagnated, giving noise to the ultrasonic waves and reducing measurement accuracy.

This invention solves this problem,
The purpose of this invention is to efficiently rotate the rotating mirror.
Moreover, it is an object of the present invention to provide an ultrasonic flaw detection device for pipes that performs rotation evenly, prevents foreign objects from clogging the bearing, and eliminates noise from being introduced into the ultrasonic waves, increasing measurement accuracy. .

[Means for Solving the Problems] The present invention as a means for solving the above problems includes a probe that transmits ultrasonic waves in the axial direction of the test tube, and a probe that is installed inside the tube. a rotating mirror that projects from the housing and reflects the ultrasonic waves from the probe onto the tube wall of the test tube; An ultrasonic flaw detection device for a tube comprising a rotating cylindrical body equipped with a turbine that rotates concentrically, the rotating cylindrical body being fixed in a housing via a bearing between the turbine and the mirror, A collar is provided on the outside of the rotating cylindrical body and on the turbine side of the bearing to prevent water from leaking into the bearing, and a collar for ultrasonic wave transmission and water drainage is provided in the ultrasonic passage section of the rotating cylindrical body. A hole for draining water is provided on the side of the mirror, and in particular, the hole for transmitting ultrasonic waves and draining water has a flange on the edge of the hole. It is a device.

[Function] In the ultrasonic flaw detection device of the present invention, the water supplied into the housing drives the turbine, and the water is prevented from leaking into the bearing provided outside the rotating cylindrical body and on the turbine side of the bearing. The collar allows the flow to flow mostly towards the axis of the tube through an opening in the rotating cylinder provided between the collar and the turbine. For this reason, only a fixed direction of force is applied to the turbine, which allows it to rotate efficiently and evenly.

Further, because of the brim, foreign objects will not enter the bearing and become clogged, and this will not cause uneven rotation or damage to the bearing.

On the other hand, water flowing toward the axis of the tube acts as a medium for ultrasonic waves and flows toward the mirror along the axis of the tube. This water flows out through the ultrasonic wave transmission and water drainage holes provided at the ultrasonic intersection of the rotating cylinder and on the mirror side of the rotating cylinder. In this case, since the holes are provided in the rotating cylindrical body in the direction in which the ultrasonic waves are reflected from the mirror and on the side of the mirror, there is almost no reaction due to outflow of water, increasing the efficiency of the turbine.

Furthermore, in the present invention, if a collar is provided on the edge of the hole for ultrasonic wave transmission and water drainage, the water flowing out from the hole will flow in a direction substantially perpendicular to the axis.
No vortices are generated at the center of the hole, and therefore no noise is generated in the ultrasonic waves, allowing for highly accurate measurements.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In the figure, reference numeral 1 denotes an ultrasonic flaw detection device, which is inserted into the test tube 2 and set by a spring 3 so that the axes of the flaw detection device 1 and the test tube 2 coincide.

The ultrasonic flaw detection apparatus 1 includes a probe 5 fixed in a housing 4 for transmitting and receiving ultrasonic waves, a rotating mirror 6 for reflecting ultrasonic waves, a turbine 7 for rotating the mirror 6, and the like.

The rotating mirror 6 and the turbine 7 are integrally coupled to a rotating cylindrical body 20, and the rotating cylindrical body 20
is rotatably fixed inside the housing 4 via a bearing 8 at an intermediate outer side between the rotating mirror 6 and the turbine 7. The rotating cylindrical body 20 has an opening 21 that is mostly open except for the support member so that water can pass between the turbine 7 and the bearing 8. Furthermore, near the turbine 7 side of the bearing 8,
A collar 9 that prevents water from leaking into the bearing 8 is provided on the outside of the rotating cylindrical body 20. Note that the flange 9 only needs to prevent the flow of water from passing directly into the bearing 8, and does not need to prevent water from leaking into the bearing 8.

The rotating mirror 6 is rotated at 45° with respect to the axis of the test tube 2.
The ultrasonic pulse transmitted from the probe 5 is reflected toward the wall of the tube 2 to be examined. The rotating cylindrical body 20 is provided with holes 10 for transmitting ultrasonic waves and draining water so as not to impede the progress of ultrasonic pulses going back and forth between the tube wall and the rotating mirror 6. Further, approximately triangular drainage holes 1 are provided on both sides of the mirror 6 of the rotating cylindrical body 20 to avoid the mirror portion.
1 is provided.

Furthermore, the ultrasonic wave transmission and water drainage hole 10
A collar 12 is provided on the edge. This collar 12 is connected to the axis of the test tube 2 using a rotating mirror 6.
The height is such that it intercepts the flow of water bent in a 45° direction and is almost perpendicular to the axis.

In the above-mentioned ultrasonic flaw detection apparatus 1, water is supplied as an ultrasonic medium into the test tube 2 and the housing 4, and the test tube 2 and the housing 4 are always filled with flowing water. Here, the ultrasonic pulse is transmitted from the probe 5 in the axial direction of the test tube, and the rotating mirror 6
The light is reflected toward the wall of the tube to be examined and reaches the tube wall.
This ultrasonic pulse is reflected by the wall of the tube to be examined and becomes an echo wave, which reaches the rotating mirror 6, is reflected again by the mirror 6, and is received by the probe 5. By measuring the time from the emission of this ultrasonic pulse to the reception of the echo wave, the distance from the axis to the tube wall to be examined can be calculated. By moving the flaw detection device 1 in the axial direction, measurement can be performed in the axial direction, and by statistically processing these results, the inner wall of the test tube can be detected.

The water 14 supplied into the housing 4 rotates the turbine 7 and is mostly connected to the turbine 7 and the collar 9 because it prevents water from leaking into the bearing 8.
It flows toward the rotating mirror 6 in the direction along the axis through the opening between the two.

The water that has flowed towards the mirror 6 is divided into three directions, and some of the water flows into the ultrasonic waves and the water drain hole 1.
0 and other parts flow out from drain holes 11 on both sides of the mirror 6. In this case, the water flowing out from the holes 10 for ultrasonic wave transmission and water drainage is
Therefore, the rotating mirror 6 rotates the axis of the test tube 2.
It intercepts the flow of water bent in a 45° direction and becomes approximately perpendicular to the axis. The water flowing out from these three directions is combined with the water supplied to the test tube 2 and extracted out of the system.

[Effects of the invention] The present invention provides an ultrasonic flaw detection device for pipes in which a collar is provided on the turbine side of the bearing to prevent water from leaking into the bearing, and an ultrasonic wave is transmitted to the ultrasonic passage of the rotating cylindrical body. A hole for draining water and a hole for draining water on the side of the mirror allow the rotating mirror to rotate efficiently and without uneven rotation.
In addition, it prevents the bearing from becoming clogged with debris, and has the special effect of being able to measure accurately and efficiently without causing noise to the ultrasonic pulses being measured, and without damaging the mirror rotation bearing. has.

[Brief explanation of the drawing]

The figure shows one embodiment of the ultrasonic flaw detection device of the present invention. 1 in the figure is an ultrasonic flaw detection device;
2 is a test tube, 5 is a probe, 7 is a turbine,
Reference numeral 8 indicates a bearing, 9 indicates a collar to prevent water from leaking into the bearing, and 20 indicates a rotating cylindrical body.

Claims (1)

[Claims for Utility Model Registration] (1) A probe that transmits ultrasonic waves in the axial direction of a test tube, a housing that houses the probe, and a probe that protrudes from the housing and extends from the probe. a rotating cylindrical body equipped with a rotating mirror that reflects the ultrasonic waves of the sample onto the tube wall of the test tube, and a turbine that is integrally coupled with the mirror and rotates the mirror concentrically with the tube axis of the test tube. In an ultrasonic flaw detection apparatus for a tube, the rotating cylindrical body is fixed in a housing between the turbine and the mirror via a bearing, the bearing being outside the rotating cylindrical body and on the turbine side of the bearing. In addition to providing a flange to prevent water from draining inward, holes for ultrasonic wave transmission and water drainage are provided in the ultrasonic passage portion of the rotating cylindrical body, and holes for draining water are provided in the side portion of the mirror of the rotating cylindrical body. An ultrasonic flaw detection device for pipes, which is characterized by: (2) The ultrasonic flaw detection device for pipes according to claim 1 of the utility model registration claim, wherein the hole for transmitting ultrasonic waves and draining water is provided with a flange on the edge of the hole. .