KR20090008212U - Explosion-proof flexible joint - Google Patents

Abstract

The present invention relates to an explosion-proof flexible joint, and more particularly in the explosion-proof flexible joint consisting of a pipe having an intermediate portion corrugated pipe shape, a braid surrounding it and a coupling coupled to the pipe end, wherein the pipe end and the braid And a fixing ring overlapping the end portion with all or a portion of the inner surface, wherein the end portion of the pipe has a straight pipe and has at least one circumferential protrusion in a portion corresponding to the inner surface of the fixing ring. In close contact with the inner surface, the coupling is made of a cylindrical portion and the hollow plate portion is characterized in that the length of the cylindrical portion is longer than the length of the fixing ring, the end of the tube is condensed to fix the end of the fixing ring It relates to an explosion-proof flexible joint.

Through this, the explosion-proof flexible joint does not have a separate welding process for airtightness, thus making it easy to manufacture and reducing the cost, and also reducing the industrial accident by removing the lead welding process. The effect of improving the environment can be obtained.

Flexible, joint

Description

Explosion Proof Flexible Joint {EXPLOSION-PROOF FLEXIBLE JOINT}

The present invention relates to an explosion-proof flexible joint, and more particularly, because a separate welding process is not performed in order to maintain the airtightness of the flexible explosion-proof flexible joint, it is easy to manufacture and reduce the cost, and also removes the lead welding process. The present invention relates to an explosion-proof flexible joint that can reduce industrial accidents, thereby improving the environment of workers and users.

In general, the explosion-proof flexible joint is coated with a corrugated pipe and a braid (Braid) surrounding it to form a flexible tube, as shown in Figure 1a to 1c, coupling to the end of the flexible tube (pipe) consisting of such a braid and corrugated pipe In the case of coupling, molten lead is injected between the coupling and the tube as shown in an enlarged view of FIG. 1A to weld (braze) the braid and the corrugated pipe and the coupling. Accordingly, the flexible tube and the coupling are coupled to each other while forming a welded portion, in which nuts and other coupling tools are prepared as shown in FIG. 1B and used as shown in FIG. 1C.

Therefore, in the case of applying such a welding process, the welding process is cumbersome and demanding, and there is a problem that productivity decreases and defects increase as a lot of time is required.

In addition, it is preferable that such a welding part is made only at the coupling surface between the coupling and the flexible tube, but in practice, such a welding part is taken out of the braid and exposed to the outside as shown in the drawing. There is a problem that the appearance is not beautiful, there is a risk of industrial accidents caused by the welding process.

Lastly, such welding is mainly performed using lead, which causes a worker to be exposed to lead contamination, and also causes a possibility of lead contamination to a user who is working at a place where a flexible joint is applied. At the same time, with increasing environmental concerns, the demand for parts that do not use lead is increasing.

Therefore, there is an urgent need to develop a coupling structure between a coupling and a flexible tube that can maintain airtightness between the coupling parts without using a welding process and maintain sufficient coupling force between these parts.

In order to solve the problems of the prior art as described above, the present invention does not have a separate welding process for the airtight flexible joint, it is easy to manufacture and reduce the cost, and also remove the lead welding process, etc. In order to reduce industrial accidents, the object of the present invention is to provide an explosion-proof flexible joint capable of improving the environment of workers and users as well as providing a beautiful appearance.

The present invention to achieve the above object

In the explosion-proof flexible joint consisting of a pipe having a middle portion corrugated pipe, a braid surrounding the pipe and a coupling coupled to the pipe end,

It further comprises a fixing ring for nesting the pipe end and the braid end overlapping all or part of the inner surface,

The end of the pipe is a straight pipe, having at least one circumferential protrusion in a portion corresponding to the inner surface of the fixing ring, close contact with the inner surface of the fixing ring,

The coupling is composed of a cylindrical portion and a hollow flat plate, the length of the cylindrical portion is longer than the length of the fixing ring, the end is concentric and provides an explosion-proof flexible joint, characterized in that wrapped around the end of the fixing ring.

According to the explosion-proof flexible joint of the present invention, since a separate welding process is not carried out to maintain the airtightness of the flexible explosion-proof flexible joint, it is easy to manufacture and the cost can be reduced, and also the lead welding process can be eliminated to prevent industrial accidents. Since it can be reduced, not only can the environment of workers and users be improved, but also the effect of providing a beautiful appearance can be obtained.

Hereinafter, the present invention will be described in detail.

The present invention relates to an explosion-proof flexible joint, and more particularly to the pipe 10 having a middle portion corrugated pipe shape, the braid (20) surrounding it and a coupling 30 coupled to the end of the pipe 10. In the explosion-proof flexible joint is formed, the pipe 10 and the end portion of the braid 20 further includes a fixing ring 40 for nesting the entire or part of the inner surface, the end of the pipe 10 The portion is a straight pipe, having at least one circumferential protrusion 50 in the portion corresponding to the inner surface of the fixing ring 40, close contact with the inner surface of the fixing ring 40, the coupling 30 Is composed of a cylindrical portion 32 and the hollow flat plate portion 34 is longer than the length of the fixing ring 40, the length of the cylindrical portion 32, the end of the tube is wrapped around the end of the fixing ring 40 It has a fixed structure.

In general, the flexible joint means that the coupling end is provided with a coupling or coupling to one end as shown in Figure 1c, and in some cases, both ends and couplings and couplings may be configured It is meant to include.

Specific examples of the present invention are as shown in Figs. That is, in the flexible tube of the structure in which the braid 20 is generally covered with the corrugated pipe 10, the coupling is coupled to the end thereof for the connection thereof. In such a coupling, the airtightness between the coupling and the tube is secured. In order to maintain and fix the braid at the same time without applying welding, the fixing ring 40 is introduced. The retaining ring is a ring surrounding and enclosing the braid and the pipe to be positioned therein as shown in FIGS. 2 to 6. A braid located directly below the inner side of the ring is shown in FIGS. 2 to 4. Likewise, only part of the fixing ring may be introduced, or as shown in FIG. 5, it may be introduced deeply to correspond to almost all of them. In addition, a pipe located directly below the inner side of the ring and located under the braid may also be introduced deeply to correspond to almost all of the fixing rings as shown, and in some cases only a part thereof may be introduced.

However, in order to maintain the airtight through the fixing ring, while the end of the pipe is formed as a straight pipe as a whole, at least one circumferential protrusion 50 to the portion corresponding to the inner surface of the fixing ring 40 It is brought into close contact with the inner surface of the fixing ring 40. A specific example of this is shown in FIGS. 2 to 5, in which case the protrusion 50 on the left side corresponds to the pipe 50 and the ring is fitted through the protrusion to maintain airtightness. do. In such a configuration, as the pressure of the pipe increases, the pressure in the pipe acts radially from the inside to the outside, so that the protrusions are pressed toward the fixing ring, so that the airtightness is better maintained, thereby reducing the risk of leakage.

In the case of Figure 4 has two protrusions from the left side, the leftmost protrusion is in close contact with the fixed ring directly, the next protrusion is pressed in close contact with the fixed ring by pressing the braid and the fixing ring to maintain the airtight It is shown. In addition, in the case of Figure 5 also has two projections from the left side both projections are to be pressed in close contact with the fixing ring by pressing the braid and the fixing ring together. In addition, two or more protrusions may be directly in contact with the fixing ring to increase the airtightness.

Next, for coupling the coupling 30, the coupling 30 is composed of a cylindrical portion 32 and a hollow flat plate portion 34, the length of the cylindrical portion 32 is the fixing ring 40 It is longer than the length of, and the end is concentric (in the form of decreasing radius) has a configuration to wrap around the end of the fixing ring 40 to prevent the coupling from being separated from the pipe. In addition to this, the shaft portion may be pressed into the shaft along the shaft at the end of the fixing ring to fix the braid.

In addition, the fixing of the braid is to ensure the expansion of the straight pipe portion when the pipe is expanded in accordance with the manufacturing method described below to maintain a tight gap between the straight pipe portion and the fixing ring of the pipe, the braid at the straight pipe portion It may be in close contact with the inner surface of the fixing ring, thereby allowing the braid to be fixed, may be fixed through the projection as shown in Figures 4 and 5, and the right end of the fixing ring as a whole, or partially The pipe 10 may be press-fitted inward to fix it. Preferably, as shown in the embodiment of the rightmost protrusion 50 of FIGS. 2 to 5, the pipe 10 immediately after the end of the braid side fixing ring 40. The portion further includes a circumferential protrusion so that the braid is fixed between the fixing ring and the protrusion by the protrusion. To enhance the fixing force, it may be fixed can be made uniform in the circumferential direction.

In order to manufacture a flexible joint having such a structure, as shown in FIG. 3, a corrugated pipe 10 wrapped in a braid 20 is prepared, and as shown in the end thereof, the fixing ring 40 is coupled to the pipe. The pipe 10 is expanded through a expander to enlarge the diameter of the pipe 10. In this case, an appropriate mold is applied so that the protrusion is formed at the necessary part together with the expansion of the linear part at the time of expansion. That is, the protrusion may be configured to be in close contact with the inner surface of the fixing ring to be a protrusion in which the pipe is expanded.

The position, the number of the protrusions and the mutual positions of the protrusions and the braid may have various configurations as described above in consideration of the required level of airtightness, the method of fixing the braid, and the like. In addition, as described above, the protrusion may be further configured at a portion immediately after the end of the braid side fixing ring. Another embodiment in this case is as shown in FIG.

Next, the coupling is coupled to the end of the pipe, and in order to fix the coupled coupling, the end of the coupling cylindrical portion is axially fixed as shown in the drawing using a conduit that reduces the diameter of the tube. In this case, as shown in Figures 1b and 1c, as well as may be configured to further comprise a nut and a coupling.

The present invention described above is not limited to the above embodiments and the accompanying drawings, and various modifications are made by those skilled in the art without departing from the spirit and scope of the present invention described in the utility model registration claims below. And changes are also included within the scope of the present invention.

Figures 1a to 1c shows a photograph of a flexible joint produced by conventional welding.

Figure 2 is a view showing a partial cross-sectional view of one embodiment of a flexible joint of the present invention.

3 is a view showing a manufacturing process of another embodiment of the flexible joint of the present invention.

Figure 4 is a partial cross-sectional view of another embodiment of a flexible joint of the present invention.

5 is a partial cross-sectional view of another embodiment of a flexible joint of the present invention.

Figure 6 shows a picture of an embodiment for a flexible joint of the present invention.

Description of the main symbols in the drawings

10: pipe 20: braid

30: coupling 32: cylindrical part

34: hollow plate part 40: retaining ring

50: protrusion

Claims (3)

In the explosion-proof flexible joint consisting of a pipe having a middle portion corrugated pipe, a braid surrounding the pipe and a coupling coupled to the pipe end, It further comprises a fixing ring for nesting the pipe end and the braid end overlapping all or part of the inner surface, The end of the pipe is a straight pipe, having at least one circumferential protrusion in a portion corresponding to the inner surface of the fixing ring, close contact with the inner surface of the fixing ring, The coupling is made of a cylindrical portion and the hollow plate portion is characterized in that the length of the cylindrical portion is longer than the length of the fixing ring, the end is concentric with the end of the fixing ring wrapped around the fixed joint. The method of claim 1, The pipe is a flexible joint for explosion-proof, characterized in that in close contact with the braid to the inner surface of the fixing ring in the straight pipe portion, or a portion immediately after the end of the braid-side fixing ring. The method according to claim 1 or 2, The protrusion is in close contact with the inner surface of the fixing ring is a flexible joint for explosion-proof, characterized in that the pipe is a protrusion expansion.

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