JPH037814Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a liquid seal device, and particularly to a liquid seal device suitable for feeding an ultrasonic flaw detection device with pressurized water.

For example, when inspecting a heat exchanger for a nuclear reactor, ultrasonic waves are often used. In this case, it is necessary to feed the ultrasonic sensor to the part to be inspected, but as an example of this method, a method has been developed in which pressurized water or the like is passed inside the tube and the sensor is supplied with water by the flow of this fluid. ing. (Tokukai Akira
(Invention of No. 57-160057) In this case, for example, for a tube sheet for a pipe that requires inspection, such as a heat exchanger, as shown in Fig. 3, When the sensor must be fed using pressurized water with the end of the tube in close contact with the opening in the tube sheet, without inserting the tube itself into the tube through an opening formed in the tube sheet. occurs. In this case, if the sealing performance between the tube end and the tube plate is poor, internal fluids such as pressurized water will blow out, but on the other hand, if a flange is formed at the tube end and fixed with bolts, etc., the sealing performance will be improved. However, workability is significantly reduced.

The purpose of this invention is to eliminate the above-mentioned problems and to provide a sealing device that greatly improves workability while maintaining high sealing performance.

In short, this invention provides an ultrasonic flaw detection device that has a hollow inner tube that slides with respect to the guide tube at the tip of the guide tube that guides the ultrasonic sensor to the target object. Ultrasonic waves characterized in that the piston portion is provided with a fluid inlet/outlet that covers the hollow inner tube and the guide tube connection portion including the piston component on the outer surface of the hollow inner tube, and slides the hollow inner tube to drive the piston. It is characterized by being a flaw detection device.

Examples of this invention will be described below.

Figure 1 shows a cross section of the sealing device, with center line ^l 1
The left half shows the state in which the tip is in close contact with an object such as a tube plate, and the right half shows the state in which the tip is separated from the object. In the figure, reference numeral 1 is a guide tube, 2 is a connecting ring that is screwed into this guide tube 1, and 7 is this connecting ring 2.
It is a cylinder body that is further connected to the sealing device main body 2 by the connecting ring 2 and the cylinder body 7.
Configure 0. 4 is an inner tube disposed inside the connecting ring 2 and the cylinder body 7, and 4a is a piston portion formed integrally with the inner tube 4. This piston portion 4a is configured to closely engage with the inner circumferential wall of the cylinder body 7 and slide within the inner circumferential wall. Part of the cylinder body 7 (right half in the figure)
A partition wall 7a is formed for the space 7b.
and 7c, of which space 7c communicates with a space designated by the same reference numeral as the left half (see also FIG. 2). 7d is a communication hole formed in the lower part of the partition wall 7a. Reference numeral 3 indicates a sealing member for sealing the inner tube 4 and the connecting ring 2, and reference numeral 5 indicates a sealing member for sealing the piston portion 4a and the cylinder body 7.

Because of this structure, the piston part 4a is provided with a half-moon-shaped notch as shown in FIG. ing.

Next, the tip, that is, the lower end, of the inner tube 4 is a flange portion 4b, and a sealing member 8a made of a flexible material such as rubber is connected to the flange portion 4b.
8b is attached.

Next, the operating state of this device will be explained, including FIG. 3. First, a working fluid consisting of a gas such as air or a liquid such as oil flows in from the fluid inlet 21 . As a result, the space 7e is filled with working fluid, which presses the piston portion 4a downward, and the inner tube 4 descends accordingly. Seal portions 8a and 8b formed at the ends of the flange portion 4b by lowering the inner tube 4
contacts the object 9, and the contact portion is kept airtight by the pressing force of the inner tube 4 against the object 9.
Note that the repulsive force against the pressing force of the inner tube 4 is transmitted to the flexible tube 12 through the guide tube 1 as shown in FIG.
It is held by its elasticity. When the object 9 and the sealing device 20 are tightly engaged as described above, a cable with a sensor attached to the tip is let out from the cable drive device 11, and the cable is moved by the flow of fluid such as pressurized water to seal it airtight. It is passed through an opening formed in a target object 9 such as a tube plate through a sealed sealing device 20, and detected by an ultrasonic sensor.

Next, when the engagement between the object 9 and the sealing device 20 is to be released, the working fluid is supplied from another fluid inlet 22 . As a result, the working fluid passes through the space 7b and the communication hole 7d, reaches the space 7c, raises the piston portion 4a, and releases the engagement of the inner tube 4.

In addition, although the above-mentioned case was explained using the case of feeding an ultrasonic flaw detection sensor as an example, the present invention is not limited to this, and can be widely applied to fields that require a seal.

By implementing this invention, a good sealing effect can be obtained without the need for bolting or other work, and workability can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the sealing device according to this invention.
FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a diagram showing how the ultrasonic flaw detection device is used, showing an example of how this device is used. 2... Connection ring, 4... Inner cylinder, 4a... Piston part, 7... Cylinder body, 7a... Partition wall,
7b, 7c, 7e...Space, 7d...Communication hole, 8
a, 8b... Seal member, 9... Target object.

Claims (1)

[Scope of utility model registration request] In an ultrasonic flaw detection device having a hollow inner tube that slides with respect to the guide tube at the tip of the guide tube that guides the ultrasonic sensor to the target object, a piston part that surrounds the outer periphery of the hollow inner tube is provided, and the outer surface of the hollow inner tube An ultrasonic flaw detection apparatus characterized in that the piston part is provided with a fluid inlet/outlet which covers the hollow inner tube including the piston component part and the guide tube connection part, and which slides the hollow inner tube and drives the piston.