JPH0810794Y2 - Water jet device for ultrasonic flaw detection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a water jet device for jet flaw detection of a subject, and more particularly to a device suitable for eliminating bubbles remaining in a scooter.

[Prior Art] A jet water flow for jet flaw detection is formed by ejecting water that has flowed into the scatter toward a subject from a nozzle at the tip of the scatter, and flaw detection is performed by ultrasonic waves on a water column formed by the jet water flow. It is used as a propagation path. A general example of a conventional water jet device will be described with reference to FIG. In the figure, reference numeral 1 denotes a scooter having a cylindrical cross section, a probe 2 is fitted in the scooter 1, and a cross section is narrowed at one end side facing the probe 2 to form a nozzle 3.
Reference numeral 4 denotes a pipe for supplying water into the scooter 1. The supplied water flows in the direction of the arrow shown in the figure to fill the scooter 1, and the probe 2 is soaked in water and successively ejected from the nozzle 3 to the outside. ing. Reference numeral 5 denotes a jet water flow formed between the nozzle 3 and a subject (not shown), and 6 denotes bubbles existing in the water filled in the scatter 1.

[Problems to be Solved by the Invention] In the above-mentioned conventional water jet device, the water supplied from the pipe 4 enters the scatter 1 as shown by the arrow in the figure,
The jet water jet 5 is ejected from the nozzle 3 to form a jet water flow 5. However, immediately after the jet water flow 5 is formed, a bubble 6 is generated in the scatter 1 and the generated bubble 6 remains in the scatter 1 especially on the front surface of the probe 2. Exhibit a phenomenon that is easy to do. Since the residual phenomenon of the bubbles 6 hinders the propagation of ultrasonic waves, it is necessary to continue the supply of water from the pipe 4 and discharge it to the outside of the scooter 1. However, at present, it cannot be easily discharged.
The water was continuously supplied from the tube 4 for a considerable time after the formation of the jet water flow 5, and therefore, there was a problem that ultrasonic flaw detection could not be performed for a long time until the bubbles 6 were considered to be completely discharged. .

The present invention provides a water jet device for ultrasonic flaw detection capable of discharging air bubbles remaining in a scatter of a water jet device in a short time with a simple configuration in view of the above-mentioned problems of the prior art. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a pipe for supplying water, a probe immersed in water supplied from the pipe, and water for submerging the probe. In a water jet device for ultrasonic flaw detection, which comprises a scatter having a nozzle for ejecting from the tip to the outside, the scatter is provided with a bubble-removing pipe that connects the probe part and the nozzle part in the scatter. The configuration is characterized by.

[Operation] By connecting the probe section and the nozzle section in the scooter with a tube for removing bubbles, the front surface of the probe having a large cross-sectional area and a slow water flow rate and the small cross-sectional area and a water flow rate in the scooter. When the water supplied from the pipe 4 fills the inside of the scatter and is jetted from the nozzle, the water pressure in the nozzle of the bubble removing pipe decreases, and the bubbles are communicated with the nozzle. A pressure difference is generated between the removing tube and the probe section, and back pressure is applied to the probe section through the tube. The bubbles remaining in the probe section that do not easily flow out of the scooter are rapidly discharged to the outside of the scooter by receiving the back pressure, and it is possible to start flaw detection in a short time after the supply of water to the scatter is started. Become.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In the figure, the same symbols as in FIG. 2 indicate the same items.
In the figure, 10 is a scatter having the same size as the scatter 1 shown in FIG. 2, and the scatter 10 is provided with a bubble removing pipe 11 which connects the front surface of the probe 2 and the nozzle 3 part.
In this case, the front surface of the probe 2 in communication has a larger cross-sectional area and a lower water flow rate than the nozzle 3, and conversely, the nozzle 3 has a small cross-sectional area and a high water flow rate.

For this reason, when the water supplied from the pipe 4 to the scooter 10 fills the scooter 10 and is ejected from the nozzle 3, the water pressure in the nozzle 3 portion of the bubble removing pipe 11 is reduced, and as much as that, the bubble removing pipe is A pressure difference is generated between the front surface of the probe 11 and the front surface of the probe 2. Since the back pressure due to this pressure difference is applied to the front surface of the probe 2, the bubbles 6 remaining on the front surface of the probe 2 and difficult to flow out of the scatter 10 receive the back pressure. And rapidly discharged from the scooter 10. Since the ultrasonic waves are surely propagated in the water without being disturbed by the discharge of the bubbles 6, it is possible to start the flaw detection in a short time after the supply of the water by the pipe 4 is started.

[Advantages of the Invention] Since the present invention is configured as described above,
The effect that the bubbles remaining in the scatter of the water jet device can be discharged in a short time with a simple structure is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a water jet device showing an embodiment of the present invention. FIG. 2 is a sectional view showing an example of a conventional general water jet device. 1,10 ... Scooter, 2 ... Probe, 3 ... Nozzle, 4
...... Water supply pipe, 5 ...... Jet water flow, 6 …… Bubbles,
11 …… A tube for removing bubbles.

Front page continuation (72) Inventor Yoshiaki Suzuki 650 Kazunachi-cho, Tsuchiura, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant Kyushu Branch

Claims (1)

[Scope of utility model registration request] 1. A scooter having a pipe for supplying water, a probe immersed in the water supplied from the pipe, and a nozzle for ejecting the water soaking the probe from the tip to the outside. In the water jet device for ultrasonic flaw detection, a water jet device for ultrasonic flaw detection is provided in the scatter, which is provided with a tube for removing bubbles for communicating a probe part and a nozzle part in the scatter.