JPS609719Y2 - A device that pressure-feeds a cable with a float for inspection into the pipe to be inspected. - Google Patents

Description

[Detailed description of the invention] The present invention improves the performance of the feed pipe system itself, which can move back and forth to send a test cable with a float into the pipe to be inspected, and seals the pipe when the pipe to be inspected and the feed pipe system are joined. The present invention relates to a device for pressure-feeding a cable with a float for inspection into a pipe to be inspected with improved stopping performance.

It is common for a fluid transport pipe that conveys fluid to become unable to perform its original function due to external or internal causes during its service life.

Such problems also occur in nuclear equipment, which particularly requires safety, and as a higher level of safety is required, inspection standards during service life are also becoming stricter.

A cable with an inspection probe is used to inspect the inside of a fluid transport tube that requires such inspection, such as a spiral heat exchanger tube used in nuclear equipment, and compressed air is applied to this cable to guide the cable into the heat exchanger tube. Pumping and pulling is currently the method of choice.

However, the currently known devices do not have sufficient operability and sealing performance at the connection portion from the cable pressure feeding device to the heat transfer tube, and there is a need for improvement.

The present invention discloses a technical means that provides a new idea for improving such connection parts.

The purpose of this invention is to divide the feed pipe into a fixed feed pipe and a movable feed pipe, to allow the movable feed pipe to move forward and backward, to form a seal between these two pipes, and to separate the movable feed pipe from the inspected pipe. An object of the present invention is to provide a device for pressure-feeding a cable with a float for inspection into a pipe to be inspected, which improves operability and sealing performance by crimping and joining the cable to the tube.

According to the present invention, the movable feed tube, which can be sealed so as to be movable back and forth between the fixed feed tube and the fixed feed tube, is moved toward the tube to be inspected while eliminating misalignment from the tube axis in the tube axis direction. It is configured to be crimped and bonded to this.

Therefore, the operability of the device and the sealing performance, especially the sealing performance between the feed tube and the tube to be inspected, can be achieved with a relatively simple structure.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a device for pressure-feeding a cable 3 with a float for inspection (see FIG. 2) into a tube to be inspected, such as a spiral heat exchanger tube 2, in accordance with the present invention.

Device 1 is a cable feeding and winding device 4 with a float for inspection.
(hereinafter simply referred to as the cable feeding device 4), the cable 3 with a float for inspection is transferred to the compressed fluid supply device 5 (hereinafter, an example of the compressed air supply device 5 will be described).

) (In the following, we will discuss the example of compressed air.

), which is connected to the cable feeding device 4 and the compressed air supply device 5, and which has an inner diameter sufficient to insert the float 3a of the cable with a float for inspection, protruding downward. A movable feed tube 7 having a tip that can be crimped and joined to the inspection port 2a of the heat exchanger tube 2 when moved (advanced) and has an inner diameter sufficient to allow the float of the cable with a float for inspection to be inserted, and the movable feed tube 7. A drive means 8 that moves the feed pipe 7 up and down (advances and retreats), and a drive means 8 movable in the tube axis direction that seals between the fixed feed pipe 6 and the movable feed pipe 7 when the movable feed pipe 7 is moved up and down. It mainly consists of a sealing means 9 that allows the feeding pipe to move forward and backward.

In addition, if the movable feed pipe 7 is relatively long, a support bracket 10 for guiding the feed pipe in the pipe axis direction is provided fixed to a support member 11 as shown in FIG. In addition, the fixed feed pipe 6 is provided with a flange joint 6a, and the movable feed pipe 7 is provided with a flange joint 7a.

It is preferable that the tip of the movable feed tube 7 has a shape that tightly joins to the inspection port of the heat exchanger tube 2, or is provided with an annular sealing member.

The driving means 8 is fixed to a boss of the sealing means 9, which will be described later.
A pair of cylinders 8a, a piston rod 8b arranged in the cylinder and driven, a movable feed pipe 7 which is pivotally supported at the tip of the piston rod 8a by a pin 8c and approximately at the center shaft.
It mainly consists of a connecting bar 8d fixed to the connecting bar 8d.

The sealing means 9 for sealing the movable feed tube 7 so as to be movable forward and backward in the tube axis direction will be explained with reference to FIG. 2.

In order to enable the feed pipe 7 to move up and down (advance and retreat) with respect to the fixed feed pipe 6, the fixed feed pipe 6 is cut out in a comb-like shape from its tip periphery to the entire circumference, while the movable feed pipe 6 7 is also cut out in a shape complementary to the comb-teeth shape of the fixed feed pipe 6.

The complementary shape to this is the comb teeth of the fixed feed pipe 6, for example 6C1,
For 6C2, it is notched so that it can be inserted,
In addition, the notch between the comb teeth refers to the shape of the comb teeth, for example, 7BL, which can be inserted into the notch.

Therefore, the comb teeth of the fixed feed tube 6 and the comb teeth of the movable feed tube 7 can be interposed with each other.

A mounting flange 6b is provided above the comb teeth of the fixed feed pipe 6, and the mounting annular plate 9b is airtightly fixed to the upper end of the annular boss 9a. The installation is fixed to the Franciro B with bolts and nuts.

The annular plate 9b is installed using the O-ring 9c inside the position.
is provided between the sealing means 9 and the flange 6b to obtain airtightness in the upper part of the sealing means 9.

An annular plate 9d for mounting is also airtightly fixed to the lower end of the annular boss 9a.

An annular member 9f with an O-ring 9e interposed between it and the movable feed pipe is fixed to this annular plate 9d with bolts and nuts.

To install the annular plate 9d, use the O-ring 9g inside the position.
is provided.

O-rings 9e and 9g provide airtightness at the lower end of sealing means 9.

In addition, each feeding tube has a chamfered part on the inside of the tip of the comb teeth, such as a sloped part or a rounded part 6cb (shown by a dotted line), 7bb
is formed.

A guide bush (oilless) 9h that fits on the outer periphery of the movable feed pipe 7 in order to obtain a guiding and sliding effect is an annular boss 9a.
It is inserted along the inner surface of the

The operation and effects of the device 1 of the present invention having the above-described configuration will be explained.

As shown in FIG. 1, the movable feed pipe 7 is in a raised position or a retreated position, and the movable feed pipe 7 is positioned on the tube axis of the heat exchanger tube 2 to be inspected by a positioning device (not shown). Assume that it is located.

Now, the piston rod 8b is moved downward by hydraulic pressure or air pressure acting in the cylinder 8a, and the movable feed pipe 7 is guided by the support bracket 10 together with the connecting bar 8d that is moved downward. (arrow F).

Then, the tip of the movable feed tube 7 is pressed and joined to the inspection port 2a of the heat exchanger tube 2.

This crimp connection prevents the tip of the movable feed pipe 7 from detaching from the inspection port 2a when a cable with an inspection float is fed by pressure from the compressed air supply device 5 from the cable feeding device 4, which will be described later. This force is generated by being applied from the driving means 8 to the movable feed pipe 7.

Therefore, in conjunction with the sealing means 9 that allows the movable feed pipe to move back and forth in the tube axis direction, the entire compressed air supply system of the apparatus is This means that sufficient sealing performance is obtained.

In this way, when the inspection using the test float-equipped cable is completed for the heat exchanger tube, the compressed air supply from the compressed air supply device 5 is stopped, and then the test float-equipped cable is wound by the cable feeding device 4. collect it.

Thereafter, the operating mode of the drive means 8 is switched to the retracting mode to return the movable feed pipe 7 to the retracted position (arrow R).

Then, a positioning device (not shown) positions the movable feed tube 7 to the next heat exchanger tube, and the above-described operations are repeated to inspect this heat exchanger tube.

In this way, the movable feed pipe 7 can be crimped and joined to the heat exchanger tube 2 very easily, and its operability is excellent, and in the case of nuclear equipment that requires inspection of a large number of heat exchanger tubes, it is suitable for inspection. can be carried out within a short period of time and is extremely beneficial.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, the sealing means 9' that allows the movable feed tube to move back and forth in the tube axis direction is the annular boss 9a in the first embodiment, the comb tooth portion of the fixed feed tube, and the comb tooth portion of the movable feed tube. In place of the guide bush 9h and the annular member 9f, an annular plate 9b to which the upper end of the bellows 911 is fixed.
.

An annular plate 9d to which the lower end of the bellows 91 is fixed and a flange 9j formed on the movable feed pipe 7 are used.

An O-ring 9C is interposed between the annular plate 9b and the flange 6b, and the annular plate 9b and the flange 6b are connected by bolts and nuts.
The O-ring 9 is tightened between the annular plate 9d and the flange 9j to ensure airtightness between the bellows 91 and the fixed feed pipe 6.
The annular plate 9 is connected by bolts and nuts (not shown) with g interposed therebetween.
d and the flange 9j are tightened to obtain airtightness between the bellows 91 and the movable feed pipe 7.

Further, it is preferable to provide guide members 6d and 7c to improve guiding performance in the bellows 91 portion.

Further, in order to prevent center runout of the movable feed pipe 7, it is preferable that a guide member (not shown) is provided outside the support bracket 10 at an appropriate location for multi-point support, for example, below the flange 7a.

Since the other components are the same as those in the first embodiment, the same numbers will be given to them and their explanation will be omitted.

The sealing means 9' in the second embodiment has exactly the same function as the sealing means 9 in the first embodiment, and the other configurations are also the same, so the operation and action in this embodiment are also the same as in the first embodiment. The operation and effect are the same as in the example.

Although compressed air is used as an example of the fluid for propelling the float in the above embodiment, other compressed gases or compressed liquids may also be used.

Moreover, an electromagnetic type can be used as the driving means.

As is clear from the above explanation, according to the present invention,
By making a part of the feed pipe a movable feed pipe, it is extremely easy to press and bond to and release the pipe to be inspected, and the operability of the apparatus can be greatly improved.

Such high operability facilitates inspection of a large number of tubes to be inspected, such as heat exchanger tubes of nuclear power equipment, and can contribute to shortening the inspection time.

Not only can this high operability be obtained, but also the sealing performance when joining the feed tube and the tube to be inspected is good.

Since the structure allows the test float to pass smoothly through the expandable sealing means between the fixed feed pipe and the movable feed pipe, there is no possibility that the cable with the test float will be supported by this sealing means. do not have.

Since this sealing means has a structure that does not cause misalignment of the movable feed pipe, there is no deterioration in the sealing performance between the movable feed pipe and the pipe to be inspected due to misalignment, and it is also equipped with a float for inspection. Cables can also be inserted and removed smoothly.

[Brief explanation of the drawing]

FIG. 1 is an overall view of an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of the first embodiment of the present invention, and FIG. 3 is a partially enlarged sectional view of the second embodiment of the present invention. In the figure, 1 is a device for feeding a test cable with a float into the heat transfer tube, 2 is a heat transfer tube, 3 is a cable with a test float, 3a is a float, 4 is a cable feeding device, 5 is a compressed air supply device, 6 7 is a fixed feeding tube, 7 is a movable feeding tube, 8 is a driving means, and 9 is a sealing means that allows the movable feeding tube to move forward and backward in the tube axis direction.

Claims (1)

[Claims for Utility Model Registration] 1. Connecting a feed pipe to a pipe to be inspected, and feeding a float of a cable with a float for inspection through the inside of the feed pipe using pressurized air, into the pipe to be inspected. In a device for force-feeding a test cable with a float into a pipe to be inspected, a fixed feed pipe is connected to the feed pipe of the device and has a sufficient inner diameter to allow the float of the test float cable to be inserted; a movable feeding tube having an inner diameter sufficient to allow the float of the cable with a float for inspection to be inserted therethrough, and having a tip that provides a sealing connection with the tube to be inspected when crimped and bonded to the tube to be inspected; a means for sealing the fixed feed pipe and the movable feed pipe so as to be movable in the axial direction of these pipes; and a means for sealing the movable feed pipe so as to be movable in the axial direction of the fixed feed pipe and the movable feed pipe. A device for pressure-feeding a cable with a float for inspection into the pipe to be inspected. 2. The means for sealing the movable feed tube so that it can move forward and backward in the tube axis direction is formed by a comb tooth formed by notching from the periphery of the distal end of the fixed feed tube, and a comb tooth shape of the fixed feed tube having a complementary shape. comb teeth of the movable feed tube which are formed by notches and are interlocked with the comb teeth of the fixed feed tube; Claim 1 of the Utility Model Registration Claim, characterized in that the method is constituted by means for sealing the fixed feeding tube and the movable feeding tube so that they can move forward and backward in the tube axis direction over the advancing length of the comb teeth. A device that pumps a cable with a float for inspection into the pipe to be inspected. 3. A device for pressure-feeding an inspection float-equipped cable into a pipe to be inspected as claimed in claim 2, wherein a chamfer is formed on the inner edge of the comb tooth tip of the feeding tube. 4. A float for inspection into a pipe to be inspected as set forth in claim 2 or 3 of the utility model registration claim, characterized in that a guide bushing is provided across the cutout portions of the fixed feed pipe and the movable feed pipe. A device that pressure-feeds attached cables. 5. The means for sealing the movable feed tube so that it can move forward and backward in the tube axis direction includes a bellows provided between the tip of the fixed feed tube and the rear end of the movable feed tube, and a tube axis of the fixed feed tube. and a guide mechanism for guiding the movable feed pipe by aligning the tube axis of the fixed feed pipe with the pipe axis of the fixed feed pipe. A device that pressure-feeds a cable with a float for inspection.