JPS6013123Y2 - Cable for insertion into pipe - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a cable for insertion into a pipe.

In order to detect flaws in the thin tubes of a helical steam generator, it became necessary to insert a flaw detector and a signal cable into the tubes.

The helical steam generator has a total length of 100m and an inner diameter of 2.
It has 4 strokes and is helical, making it extremely difficult to insert.

The conventional one is shown in Fig. 1, 01 is a helical coil,
02 is a cable, and 03 is a fluid resistance body.Fluid resistance bodies 03 are attached to the cable 02 at equal intervals, and are inserted into the helical coil 01 using pressurized water as shown by the arrow.

However, since the fluid resistance elements 03 are attached to the cable 02 at equal intervals, the parts that generate thrust are only at certain intervals, so compared to the case where the entire cable 02 is pulled in the curved part of the helical coil 01. It is disadvantageous.

Furthermore, since the cable 02 uses a method of generating thrust through resistance, insertion pressure is not effectively converted into cable thrust.

Furthermore, when a device for pushing the cable is required, it is disadvantageous in terms of shape (it is difficult to implement the device because of the unevenness).

The present invention solves the above-mentioned conventional problems, and an example is shown in Figs. 2 and 3. 1 is a cable, lay 1
b* lc is an element of cable 1, 2 is a spiral groove, 3 is a hole composed of elements 1a, 1b, and lc, 4 is a signal cable, 5 is a tube into which cable 1 is inserted,
It is a curved pipe or a straight pipe.

The outer diameter of the cable 1 is slightly smaller than the inner diameter of the tube 5, and has a spiral groove 2 on the outer surface. 3) and take a large lead.

Further, a hole 3 for inserting a signal cable 4 is provided in the center of the cable 1.

For efficient insertion, the spiral groove 2 should be deep enough not to interfere with the hole 3 through which the signal cable 4 is passed.

In addition, an element law l is placed around the signal cable 4.
Cable 1 may be made by twisting bt lc.

The cable 1 is preferably made of nylon or the like.

To explain the operation of the present invention with reference to FIG. 4, the cable 1
is wound around the cable winding device 11 to prevent it from becoming tangled.

The winding device 11 is surrounded by a pressurized container 12, and the opening is connected to the pipe 5 to be inserted, and a pressurized fluid 14 such as pressurized water can be injected from an injection port 13 of the pressurized container 12. As a result, the cable 1 is inserted into the tube 6 using the momentum change of the helical movement of the pressure fluid 14 as a thrust.

The arrows in FIG. 2 indicate the helical movement of the pressure fluid 14 on the elements la, tb, lc.

As mentioned above, the present invention is a cable for insertion into a pipe whose outer diameter is slightly smaller than the inner diameter of the pipe to be inserted, has several spiral grooves on the outer surface, and has a signal cable inserted in the center. 1) It is efficient because the thrust is generated not by fluid resistance as in the past, but by a change in momentum.

(2) In contrast to conventional cables, where there are gaps between the parts that generate thrust, the cable of the present invention is pushed with the same force no matter which part of the cable you look at, so it can be inserted smoothly even into curved pipes.

(3) As in the embodiment, since the cable is made of nylon or the like, the cable has excellent strength, flexibility, and flexibility.

There are other effects.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional cable for insertion into a pipe, Fig. 2 is a sectional view of an embodiment of the present invention, Fig. 3 is a sectional view taken along line AA in Fig. 2, and Fig. 4 is an implementation of the present invention. FIG. 1... Cable, 1a, 1b, 1c...
・Element, 2...Spiral groove, 3...
... hole, 4. bend, signal cable, 5 ... tube,
11... Winding device, 12... Pressurized container, 13... Inlet, 14... Pressure fluid.

Claims (1)

[Scope of utility model registration request] A cable for insertion into a pipe, which has an outer diameter slightly smaller than the inner diameter of the pipe into which it is inserted, has several spiral grooves on its outer surface, and has a signal cable inserted in the center.