JPS6244362Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a liquid fluid for ultrasonic coupling, which jets liquid fluid between an ultrasonic probe and a material to be inspected to detect flaws and measure dimensions of the material to be inspected. This relates to a jet nozzle.

In automatic ultrasonic flaw detection devices or automatic size measuring devices, liquid (water) is generally used as a medium for transmitting ultrasonic waves from a probe to a specimen.

Therefore, this type of jet nozzle jets a liquid for ultrasonic coupling between the ultrasonic probe and the material to be tested, and uses ultrasonic waves to detect flaws and measure the dimensions of the material to be tested. In the event that air components (bubbles) exist in the liquid fluid interposed between the ultrasonic probe and the test material, the ultrasonic waves incident on the test material will not only be attenuated, but also There is a problem with receiving echoes and causing noise. Moreover, if the flow of the liquid fluid interposed between the ultrasonic probe and the test material is turbulent, the passage of the ultrasonic waves will be poor, and the S/N ratio of the echo sound at the time of reception will be poor. There is a problem. Furthermore, as the distance between the ultrasonic probe and the material to be inspected becomes longer, the diffusion loss of the ultrasonic waves along the way becomes larger, and the influence of the deviation in the incident angle becomes larger.
Therefore, there should be no bubbles in the liquid fluid between the two members, the flow should be laminar, and the distance between the two members should be as short as possible without adversely affecting flaw detection and dimension measurement. is ideal.

FIGS. 1 and 2 each show an example of a conventional jet nozzle of this type.

In the conventional example shown in FIG. 1, 1 is a jet nozzle body that jets a liquid fluid toward a test material S, 2 is an ultrasonic probe mounted inside this main body 1, and 3 is a liquid fluid for coupling (hereinafter referred to as 4 is a supply port, and 5 is a discharge port.
The supply port 4 is opened in front of the probe front surface 2a.

In this conventional example, as mentioned above, the supply port 4 is opened in front of the front surface 2a of the probe.
The flow of water flows between the probe front surface 2a of the supply pipe 3 and the supply port 4.
When the water supply starts, the air trapped there may become stagnant or remain attached to the front surface 2a of the probe. Further, depending on the temperature difference between the water and the probe 2, bubbles are generated on the front surface 2a of the probe, but these bubbles also remain attached to the front surface 2a of the probe. For this reason, the ultrasonic waves emitted from the probe 2 are attenuated due to the presence of the bubbles, or are reflected by the bubbles to generate noise. Furthermore, when the water supplied from the supply pipe 3 enters the jet nozzle body 1, the volume of the flow path is expanded, causing turbulence within the jet nozzle body 1 and impairing the propagation of ultrasonic waves. was. Also, supply port 4
In this configuration in which the discharge port 5 is opened in front of the probe front surface 2a, the distance between the probe front surface 2a and the discharge port 5 becomes long, and there is a problem in that the diffusion loss of the ultrasonic waves is large.

2 is an example in which the tip 1a of the jet nozzle main body 1 in the embodiment shown in FIG. 1 is constricted, but this conventional example also has the same problems as the aforementioned conventional example.

In short, conventional jet nozzles of this type do not meet the ideal requirements mentioned above, and do not provide good transmission of ultrasonic waves between the probe and the material to be tested when performing detection or measurement. Ta.

Therefore, in view of the above-mentioned drawbacks of the conventional jet nozzle of this type, the present invention has been improved, and the perpendicular cross-sectional area decreases in the downstream direction, and the part that guides the liquid fluid in the tangential direction of the front surface of the probe has been developed. A passageway is provided on the entire outer circumference of the probe, and fins are provided in the middle of the passageway to prevent the liquid from swirling, thereby reducing the distance between the probe and the discharge port of the jet nozzle body. In addition, the flow of liquid fluid is rectified from turbulent flow to laminar flow so that it flows along the front surface of the probe, and air bubbles etc. attached to the front surface of the probe are removed. It is an object of the present invention to provide a liquid fluid ejection nozzle for ultrasonic coupling which is capable of transmitting good ultrasonic waves.

The configuration of the present invention will be described below based on the embodiments shown in the drawings.

As shown in FIGS. 3 to 6, the jet nozzle of the present invention includes an ultrasonic probe 6, a cylindrical variable diameter body 7, an intermediate member 8, a holder 9, a noise main body 10, and a liquid fluid (hereinafter referred to as liquid Supply pipe 1 of (explaining the fluid as water)
1, 11 and fins 12. The ultrasonic probe 6 has a screw portion 14 for coupling the flange 13 and a connector (not shown) on its outer periphery,
Connected to the ultrasound device via a connector. The cylindrical body 7 with different diameters is integrated by threading 15 a threaded portion formed on its outer circumferential surface with a threaded portion formed on the inner circumferential surface of the intermediate member 8, and these two members 7, 8 are integrated. It is fitted and mounted on the outer peripheral surface of the ultrasonic probe 6. Then, the supply pipe 1 is attached to the annular step portion 16 of the intermediate member 8.
The opening end of one side of the nozzle body 10 formed by integrating the nozzle bodies 1 and 11 is attached, and the nozzle body 10 is fastened to the intermediate member 8 with bolts 17. Further, the intermediate member 8 is fastened to the holder 9 with bolts 20, sandwiching the flange 13 of the probe 6. This completes the entire assembly, and a water supply passage 18 is provided between the inner circumferential surface of the nozzle body 10, the cylindrical variable diameter body 7, and the outer circumferential surface.
is configured. The diameter of the outer circumferential surface of the cylindrical body 7 of different diameters increases toward the probe front surface 6a, and the R portion 19 is formed so as to eventually come into contact with the probe front surface 6a.
is configured. Therefore, the passage 18 is
The perpendicular cross-sectional area decreases toward the downstream side.

As shown in FIG. 5, a plurality of fins 12 (eight fins are shown in the drawing) are installed at equidistant positions on the circumference of the passage 18, and in this embodiment, a cylindrical body 7 with different diameters is installed. It is integrally attached to the R section 19 of. And the upstream end surface portion 12a of the fin 12
The fins 12 have a sharp edge structure to prevent water turbulence caused by the installation of the fins 12. Note that 21 is a water supply port, and 22 is a water discharge port. The diameter of the discharge port 22 is set larger than the effective diameter of the probe 6 so that all the ultrasonic beams emitted from the probe 6 can be incident on the specimen.

Next, the operating procedure of the jet nozzle having the above structure will be explained. First, water supplied from the two opposing supply ports 11, 11 flows into the passage 18 formed around the entire circumference of the ultrasonic probe 6 through the supply port 21. At this point, the feed water is in a turbulent state. As the supply water flows through the passage 18 whose perpendicular cross-sectional area decreases in the downstream direction, the flow is contracted, and since swirling is prevented by the fins 12, the flow is sequentially rectified into a laminar flow state. . Then, it is guided in the tangential direction of the probe front surface 6a by the R portion 19, flows down from the entire circumference of the probe 6 along the front surface 6a, and is discharged from the discharge port 22 onto the specimen. Therefore, the supply water flowing through the front surface 6a of the probe is generated due to the temperature difference between the supply water and the front surface 6a of the probe, and
Air bubbles that adhere to the water can be removed and flowed out. Furthermore, when the water supply starts, air bubbles existing near the front surface of the probe 6a can also flow out.

Therefore, there are no air bubbles in the supply water that couples between the front surface of the probe 6a and the test material, which reduces the attenuation of ultrasonic waves incident on the test material and the generation of noise caused by the presence of air bubbles. there is no problem. Furthermore, since the flow state of the supplied water is a laminar flow state, the ultrasonic wave propagation property is excellent, and the entire ultrasonic beam can be incident on the specimen. Furthermore, since the supply port 21 is arranged behind the probe front surface 6a, the probe front surface 6a
The distance between a and the discharge port 22 at the noise tip can be reduced, and the distance between the probe 6 and the material to be tested can be shortened. Therefore, the diffusion loss of ultrasonic waves is reduced.

As explained above, in the present invention, a passage having a section whose perpendicular cross-sectional area decreases in the downstream direction and which guides the liquid fluid in the tangential direction of the front surface of the probe is formed on the outer periphery of the probe. By providing fins on the entire surface and preventing swirling of the liquid fluid in the middle of the passage, the distance between the probe and the discharge port of the jet nozzle body is reduced, and the flow of the liquid fluid is prevented from turbulent. The current is rectified into a laminar flow so that it flows along the front of the probe, and air bubbles adhering to the front of the probe are removed, which reduces the attenuation of ultrasonic waves and the generation of noise.
Furthermore, it is possible to provide this type of jet nozzle with less diffusion loss, and highly accurate detection or measurement with less error can be performed.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional views of a conventional jet nozzle, FIGS. 3 to 6 show an embodiment of the jet nozzle according to the present invention, and FIG. 3 is a half-sectional side view showing the whole. 4 is a front view, FIG. 5 is a front view of the fins and the variable diameter body, and FIG. 6 is a front view of the intermediate member. 6... Ultrasonic probe, 6a... Probe front, 1
8...Aisle, 12...Fin.

Claims (1)

[Scope of utility model registration request] In a liquid jet nozzle for ultrasonic coupling, which jets a liquid fluid between an ultrasonic probe and a test material to perform flaw detection and dimension measurement of the test material, the perpendicular cross-sectional area is in the downstream direction. A passageway is provided on the entire outer periphery of the probe, and a passageway is provided on the entire outer periphery of the probe, and a fin is provided in the middle of the passageway to prevent swirling of the liquidflow. A liquid fluid ejection nozzle for ultrasonic coupling, characterized by: