JPH0239594Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an in-pipe liquid dispensing tool used for internal cleaning of pipes, chemical treatment, etc.

<Background technology> In order to perform internal cleaning or chemical treatment of piping, liquid is inserted into the pipe in the form of a sandwich between the leading floater and the rear floater, and the liquid is inserted into the pipe. It has been conventional practice to apply gas pressure from the rear to force each floater and the trapped liquid into the pipe.

The above-mentioned conventional floater will be explained with reference to FIGS. 1 and 2. The piping 1 has an inner diameter d, and the floater 2 is made of an elastic material such as polyurethane, and has a diameter D and a length L. Here, the relationship among d, D, and L is generally as follows.

D/d≒1.01 to 1.06 L/D≒1.6 to 2.2 During use, push the floater 2 into the pipe 1 as shown by arrow P. At this time, since the outer diameter D of the floater is made somewhat larger than the inner diameter d of the pipe,
The floater 2 is compressed to the inner diameter d of the pipe, and the repulsive force generated by this compression maintains the sealing performance when traveling inside the pipe.

As shown in FIG.
A and the rear swinger 2b are inserted with a gap between them, and the cleaning liquid 3 is filled between the two swingers 2a and 2b. Compressed gas 4 is pressurized into the rear of the rear floater 2b, pushes the floater 2b in the direction of arrow Q, the cleaning liquid 3 is held between the two floaters 2a and 2b, and is caused to run inside the pipe. Perform internal cleaning.

At this time, in the conventional idlers 2, 2a, and 2b, the contact area with the pipe wall 1 is large, and there is a large difference between the frictional resistance at startup and the frictional resistance during running. Since it is compressible, once the idler starts running, its running speed is high, making it difficult to control the speed. Therefore, bends and rises,
In piping 1, which has many rises, vibration and
An impact occurs, and due to the imbalance of frictional resistance, the front and rear
The distance between the floating elements 2a and 2b was large, and the cleaning liquid did not reach the upper part of the piping, making it often impossible to clean the piping completely.

<Purpose of the invention> The purpose of the invention is to solve the above conventional problems,
The outer diameter of the floater body is made smaller than the inner diameter of the pipe, and a flexible rear disk is attached to the floater body to maintain the seal between the floater and the inner wall of the pipe while reducing the friction of the floater against the inner wall of the pipe. It is an object of the present invention to provide a tool for dispensing liquid in a pipe, which reduces resistance and prevents piping vibration, impact, and distance between the floaters when performing cleaning by running the floaters inside the pipe.

<Description of the invention> Next, the invention will be described by way of examples with reference to the drawings.

Figures 3, 4, and 5 are diagrams for explaining the structure of the floater according to the present invention, and the floater 12 according to the present invention has an outer diameter D ₁ that is slightly smaller than the inner diameter d of the pipe 1 into which it is inserted. and the inner diameter d of the piping 1 attached to the rear surface of the floater body 13.
Rear disc 1 with outer diameter D ₂ slightly larger than
4. The floater main body 13 generally has a maximum clearance c of 1 mm between its outer peripheral surface and the inner surface of the pipe 1.
The material is generally an elastic material such as polyurethane, and the length is generally the same as the diameter.
It should be about 1.6 to 2.2 times.

A disc-shaped disk 14 is attached to the rear of the floater main body 13. The method of attaching the disk 14 does not need to be particularly limited.

This disk 14 is made of a flexible material such as rubber or synthetic resin, and the thickness t varies depending on the inner diameter d of the target pipe 1 and the material constituting the disk 14. The thickness t must be large enough to maintain a predetermined shape with some contact pressure on the inner wall of the pipe before and during pressurization. Although it varies depending on the material of the disk, t is generally in the range of 1 to 10 mm.
The outer diameter _D2 of the disk is made somewhat larger than the inner diameter d of the pipe to maintain the sealing effect necessary to prevent leakage of working gas due to the differential pressure before and after the floater, and to maintain resistance against the inner wall of the pipe even when running. It is necessary to have a size that is small, and depending on the thickness t of the disk, it should be approximately in the range of 101 to 106% of the pipe inner diameter d.

The in-pipe liquid dispensing tool of the present invention has the above-mentioned floater 12.
It is composed of a plurality of .

As shown in FIGS. 4 and 5, the floater 12
When the disc 14 is inserted into the pipe 1, the disc 14 is deformed and its outer diameter becomes the inner diameter d of the pipe 1 from _D2 , and a sealed state is achieved. On the other hand, since the outer diameter _D1 of the floater main body 13 is slightly smaller than the inner diameter d of the pipe 1, this portion does not generate friction during running.

In the same manner as explained in FIG. 2 above, insert two floaters 12 according to the present invention into the pipe 1 at intervals,
In the meantime, cleaning liquid or the like is filled and pushed from the rear by, for example, air pressure, and the two floaters 12 are moved while holding the cleaning liquid, thereby cleaning the inside of the pipe.

By using the floater of the present invention, the frictional resistance with the inner wall of the pipe is lower than that of conventional floaters.
It prevents piping vibrations and shocks, and on the other hand, improves the sealing performance of the rear disk to prevent working gas from leaking forward, and eliminates fluctuations in the distance between the front and rear floaters, allowing for perfect construction.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional floater, Fig. 2 is a cross-sectional view showing a state in which two floaters are used to remove liquid, and Fig. 3
The figure is a cross-sectional view of the floater of the present invention inserted into a tube, and FIGS. 4 and 5 are partially enlarged cross-sectional views of the present invention. 1... Piping, 12... Floater, 13... Sweater body, 14... Disk.

Claims (1)

[Scope of utility model registration request] Multiple pieces are inserted into a pipe to sandwich a liquid for chemical processing, and when pressure is applied, the sandwiched liquid is moved within the pipe for chemical processing. a floater main body having an outer diameter slightly smaller than the inner diameter of the piping to be installed; and an airtight and flexible disk attached to the rear of the floater main body, having an outer diameter slightly larger than the inner diameter of the pipe. A floater for running liquid in pipes.