KR100420675B1 - Plastic a method of flexible pipe. - Google Patents

Abstract

In the present invention, in order to easily connect the connecting portion of the pipe flowing fluid therein with other pipe connection,

Insert and shape annular folds and spiral folds in a single pipe pipe, or sometimes form a private sector at the same time, cut one or more protruding cuts of the annular folds, and then press or mold the cuts to form a flange. Therefore, the present invention provides a method of forming a corrugated pipe for piping, which is intended to be fitted with a coupling nut on the flange so that the coupling nut can be fastened with another pipe pipe.

Description

Forming method of corrugated pipe for piping. {Plastic a method of flexible pipe.}

According to the present invention, in order to form a flange by pressing or forming an end portion in order to easily connect a connection part of a pipe in which a fluid (for example, water, gas, other chemicals) flows with another pipe connection part,

The corrugated pipe constituting the pipe is formed by integrally forming the annular corrugated portion and the spiral corrugated portion, and cutting one protruding portion of the annular corrugated portion, and the end of the corrugated pipe for piping that is easy to be tightened by crimping or processing a flange. It relates to a molding method.

As is well known, the annular corrugated pipe (1), the spiral corrugated pipe (2), and the straight pipe (3) were used as a single unit during the fluid transfer piping.

In other words, in the case of the annular corrugated pipe (1), the structural resistance is high and the distortion absorption capacity is higher than that of the spiral corrugated pipe. There is only a risk of damage due to the fact that it is only broken. However, since the wrinkles are annular, they are easy to crimp at the end and the mounting by the crimping part 6 is convenient. Therefore, the spiral corrugated pipe 2 is often used for resistance during fluid transfer. It has a small and good twist absorbing ability, and thus has many advantages over the annular corrugated pipe (1). However, since the crimp is formed in a spiral shape, the end portion cannot be crimped. In the case of, it is not flexible and it is not suitable for piping with many bends.

Therefore, as shown in Fig. 4, when the pipe is formed into a spiral corrugated pipe 1, a separate annular pleat or a privately formed portion is formed or welded to the cut portion 11 so that the pleated portion of the welded portion 4 is formed. In addition, since the flange 10 was formed by crimping or processing the private parts, the welding cost and the processing cost were high, causing the piping cost to be expensive.

In addition, in the case of the method of processing the flange 10 after the end of the spiral corrugated pipe (1) in the private state as shown in FIG. 6, the cost of straightening was also almost the same as the spiral corrugated pipe 1M production cost, and the flange processing cost of the corrugated pipe 1M As it was added about 20% separately, it was expensive to install.

As described above, the present invention is to cut the annular corrugated portion as necessary in the middle of the spiral corrugated portion, spiral corrugated portion so as to easily process the crimping portion or the flange at the end of the spiral corrugated tube to facilitate the pipe fastening. Referring to the drawings in detail as follows.

1 is a partial cross-sectional view of a conventional annular corrugated pipe.

Figure 2 is a partial cross-sectional view of a conventional spiral corrugated pipe.

Figure 3 is a partial cross-sectional view of processing a connection after welding a straight pipe to the conventional spiral corrugated pipe.

Figure 4 is a partial cross-sectional view of the processing of the connection after welding a straight pipe to the conventional annular corrugated pipe.

Figure 5 is a partial cross-sectional view of the conventional crimping connection portion of the annular corrugated pipe.

Figure 6 is a side view of a conventional spiral corrugated pipe by stretching both ends in a private state.

Figure 7 is a side view of the annular corrugated pipe cutting site of the present invention.

Figure 8 is a side view of the cut portion of the present invention after processing the connection portion.

[Explanation of symbols on the main parts of the drawings]

1. annular corrugated pipe. 2. Spiral corrugated pipe.

3. Intuition. 4. Welded parts.

5. Combined nuts. 6. Crimp.

7. annular wrinkles. 8. Spiral folds.

9. Private sector. 10. Flange.

11,11a. Cutting part. 12. Pipe for pipes.

1 to 6 of the accompanying drawings is a cross-sectional view of a conventional corrugated pipe,

7-8 are side and sectional views of the corrugated tube of the present invention.

That is, the annular corrugation part 7 and the private sector part 9 and the spiral corrugation part 8 are simultaneously formed in the order of forming a conventional corrugated pipe, but the annular corrugation part 7 and the private part part 9 are It is relatively short (e.g., about 5-7 bones in the annular corrugation, about half the length in the private sector, and the length of joining the nut 5 to the flange 10). Corresponding to the main pipe was configured as long as a predetermined length.

In the drawings, reference numerals 11 and 11a denote cutting portions, and 12 denote pipes for pipes.

The shaping | molding method of this invention comprised in this way is demonstrated concretely.

To describe the present invention, a pipe 12 is inserted into a mold having a certain shape, and a method of compressing a filling in the pipe 12 and a method of inserting a mold into the pipe 12 and pressing the pipe 12 outside the pipe 12. Done.

Accordingly, the mold of the pipe 12 is placed in the annular corrugation part 7, the spiral corrugation part 8, or the private sector part 9 in the middle thereof, and then processed sequentially. That is, the annular corrugation part 7 is About 5-7 bones, in the case of the private sector, cut in half so that the nut 5 is fastened to the machined flange 10, and the spiral pleated portion 8 becomes the main pipe. After cutting the intermediate portion of the annular corrugation portion 7 or the private sector portion 9 as necessary, the cutting portion 11, 1la is pressed or machined to the flange 10 which is pressed or processed. 5) to the other pipe.

In this way, the present invention forms the pipe (l2) itself having a pipe at the same time to form an annular corrugated portion (7), a private sector portion (9) and a spiral corrugated portion (8) at the same time simply cut (11, 11a) Only by cutting the annular corrugation part 7 or by processing the private sector part 7 and inserting the coupling nut 5 on the flange 10 and fastening it with other pipe pipes, a solid pipe is made. After forming or welding spiral corrugated pipes or straight pipes, it is possible to avoid the unnecessary cost and hassle of machining a flange, thereby reducing the pipe cost.

As described above, the annular corrugation and the spiral corrugation are sometimes inserted into the pipe pipe at the same time, and the private sector is inserted at the same time. It is possible to fasten ordinary coupling bolts and nuts to reduce the fluid resistance of spiral corrugated pipes and to improve the performance against warping, and at the same time, it can have the function of fastening to annular corrugated pipes or straight pipes. Simple, quick and low cost piping can be achieved.

Claims (1)

In constructing the pipe for conveying fluid, The annular corrugated portion 7 and the spiral corrugated portion 8 are simultaneously molded into one pipe pipe 12 to cut one or more protruding cut portions 11a of the annular corrugated portion 7 so that the other pipe pipe Forming method of the corrugated pipe for piping, characterized in that it is easy to fasten with.