JP4210109B2 - Pipe joint - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint that can ensure absolute reliability in a harsh environment without being influenced by the positional relationship between pipes when connecting pipes arranged apart from each other.
[0002]
[Prior art]
As a simple means for connecting pipes, a pipe joint using a rubber hose is widely used.
For example, as shown in FIG. 3, a pipe joint using a rubber hose is inserted into the end of a rubber hose 8 at the tip of the pipe 1 that has been slipped off, and the part into which the pipe 1 is inserted is inserted through a collar 9. It is caulking.
However, such a pipe joint using a rubber hose is flammable even if a high-insulation type is adopted for the rubber hose.
Also, considering the properties of rubber, it is unsuitable for fluids such as hydrogen that penetrate tissue.
In such a case, a flexible metal corrugated pipe is connected by a composite pipe 10 having a double structure covered with a metal mesh hose. In that case, as shown in FIG. A commercially available pipe joint that is connected to a pipe (not shown) by a dedicated connecting member 11 is used.
[0003]
[Problems to be solved by the invention]
The latter pipe joint is flame resistant and does not have the possibility of permeation of fluids such as hydrogen, so high reliability can be obtained, but it is poor in flexibility and has a low degree of freedom. If it is shifted, there is a problem that the shift cannot be absorbed.
Moreover, a dedicated connecting member is required for connecting the composite pipes, resulting in an increase in cost.
Furthermore, as can be said for the former pipe joint, a fatal defect has been pointed out that the internal pressure tends to cause deformation such as expansion and elongation.
[0004]
Accordingly, an object of the present invention is to provide a pipe joint that has flexibility comparable to that of a rubber hose, has high flame resistance, and does not allow fluid such as hydrogen to permeate.
[0005]
[Means for Solving the Problems]
According to the present invention, a protrusion is provided around a connecting portion of a pipe, and a tip portion of the connecting portion provided with the protrusion is inserted into an end portion of a metal corrugated pipe so that the metal corrugated pipe is inserted into the protrusion. Joining at the part that hits the end part side, the outer periphery of the metal corrugated pipe is covered integrally with the non-metallic flexible heat-resistant tube up to the range of the connecting part including the pipe protrusion, and the flexible tube is covered. A pipe joint in which a collar is externally fitted to the connecting portion covered by the above and the collar is press caulked with respect to the ridge, and a pipe joint that connects pipes that are separated from each other, from the end side. Insert the tip of the connecting part with the ridge around the separated part into the end of the metal corrugated pipe and join the metal corrugated pipe in the vicinity of the end, and the outer periphery of the metal corrugated pipe , A metal flexible heat-resistant tube is used to cover the entire area of the joint, including the ridges of the pipe, and a collar is externally fitted to the joint covered with the flexible tube. The pipe joint.
[0006]
In the former pipe joint, the connecting part can be formed in a nipple extending at the tip of the pipe, and in the latter pipe joint, a protrusion and a metal corrugate are provided on the outer periphery of the pipe connecting part. It is desirable to perform fur tree processing between the joint with the pipe.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, a connecting portion A is formed at the tip of a pipe 1 by extending a nipple 2 around which a protrusion 2a is provided. The tip of the connecting portion A is made of stainless steel as a metal corrugated pipe. Inserted into the end portion of the thin corrugated pipe 3, and a portion (a brazed portion) P where the stainless thin corrugated pipe 3 and the connecting portion A of the pipe 1 abut on the end side from the ridge 2 a of the pipe 1 It is joined.
The stainless steel thin corrugated pipe 3 is covered with a non-metallic flexible heat-resistant tube 4 on the outer periphery, and the non-metallic flexible heat-resistant tube 4 extends to the nipple 2 which is the connecting portion A of the pipe 1. The protrusion 2a provided around the nipple 2 is also integrally covered.
As the non-metallic flexible heat-resistant tube, for example, a so-called glass fiber blade hose can be suitably used.
[0008]
A collar 5 is fitted on the connecting portion A covered with the non-metallic flexible tube 4, and the collar 5 is subjected to a press caulking process in which the collar 5 is pressed in the axial direction at the portion of the ridge 2, whereby the nipple 2. And the non-metallic flexible tube 4 are firmly connected.
Therefore, the metal corrugated pipe 3 is protected from various adverse effects from the outside by the non-metallic flexible tube 4 and does not yield to a high internal pressure.
[0009]
The pipe joint formed in this way is rich in flexibility, excellent in flame resistance and airtightness, and is suppressed from deformation due to a high internal pressure, so that it can be suitably used under severe conditions.
Moreover, it is possible to connect by a general caulking process without requiring a dedicated connecting member.
[0010]
In the embodiment, the collars are connected by press caulking that pressurizes the collar in the axial direction, but they can also be connected by octagonal caulking that pressurizes from the radial direction.
In addition, the rigidity of the connecting portion can be improved by forming it in a nipple extending at the tip of the pipe, but the connecting portion can also be set to the pipe itself in applications where rigidity is not so required.
Next, such an embodiment will be described.
In addition, the same code | symbol is attached | subjected about the member which is common in the said Example.
[0011]
In FIG. 2, the connecting portion A set in the pipe 1 is provided with a ridge 6 around the portion farthest from the tip, and the tip of the connecting portion A that contacts the end from the ridge 6 is a thin corrugated stainless steel corrugate. The end of the pipe 3 is inserted, and the tip of the stainless thin corrugated pipe 3 and the pipe 1 are joined to each other in the vicinity of the end (braded portion) P of the pipe 1.
In the connecting portion A of the pipe 1, a fur tree processing 7 is applied to an outer peripheral surface that is between the brazed portion P and the protrusion 2 a.
[0012]
The outer periphery of the metal corrugated pipe 3 is integrally covered up to the connecting portion A of the pipe 1 with a non-metallic flexible heat-resistant tube 4 as in the above-described embodiment, and is covered with the flexible tube 4. The pipe 5 and the non-metallic flexible tube 4 are firmly connected by externally fitting the collar 5 to the connecting portion and subjecting the collar 5 to the full length from the radial direction by an eight-side caulking process.
The collar 5 is formed with a locking portion 5a, and the locking portion 5a is locked to the protrusion 6 so that the collar 5 is more securely prevented from coming off.
[0013]
In the pipe joint formed in this way, since the connecting portion is set on the pipe itself, it is not necessary to extend the nipple, and the cost can be reduced by adopting the eight-way caulking.
In addition, since the fur tree processed part functions as a stopper, the countermeasure for preventing the non-metallic flexible heat-resistant tube from slipping is perfect.
[0014]
In the above embodiment, a stainless steel corrugated pipe is used as the metal corrugated pipe, but it may be made of a metal other than stainless steel or may be somewhat thick as long as it has flexibility. .
[0015]
【The invention's effect】
As described above in detail, according to the present invention, it is rich in flexibility, excellent in flame resistance and airtightness, and can sufficiently cope with a high internal pressure, so that absolute reliability can be ensured under severe conditions.
Moreover, it is possible to connect by a general caulking process without requiring a dedicated connecting member.
And the rigidity of a connection part can be improved by forming a connection part with the nipple extended at the front-end | tip of a pipe.
Furthermore, if a fur-tree process is performed between the protrusion and the joint portion of the metal corrugated pipe, the non-metallic flexible heat-resistant tube can be prevented from coming off.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of the present invention.
FIG. 2 is an explanatory diagram of a modification example.
FIG. 3 is an explanatory diagram of a conventional example.
FIG. 4 is an explanatory diagram of a conventional example.
[Explanation of symbols]
1 ・ ・ Pipe, 2 ・ ・ Nipples, 2a ・ ・ Projections, 3 ・ ・ Stainless corrugated pipe made of stainless steel, 4 ・ Non-metallic flexible heat-resistant tube, 5 ・ ・ Collar, 5a ・ ・ Locking part, 6 ・・ Projection, 7 ・ ・ Furtree processing, 8 ・ ・ Rubber hose, 9 ・ ・ Collar, 10 ・ ・ Composite pipe, 11 ・ ・ Connecting member, A ・ ・ Connecting part, P ・ ・ Bading part.

Claims (4)

It is a pipe joint that connects pipes arranged apart from each other, and a ridge is provided around the connecting part of the pipe, and the tip of the connecting part provided with the ridge is provided at the end of the metal corrugated pipe. Insert the metal corrugated pipe into the part and join the metal corrugated pipe at the end where it touches the end, and connect the outer periphery of the metallic corrugated pipe to the outer periphery of the metal corrugated pipe with the nonmetallic flexible heat-resistant tube. This is a pipe joint that covers the entire area of the joint integrally, externally attaches a collar to the joint covered with the non-metallic flexible heat-resistant tube, and presses the collar against the ridge. The pipe joint according to claim 1, wherein the connecting portion is formed in a nipple extending at the tip of the pipe. It is a pipe joint that connects pipes that are separated from each other, and the tip of a connecting part that has a ridge around the part separated from the end side is inserted into the end part of the metal corrugated pipe and the The corrugated pipe is joined in the vicinity of the end portion, and the outer periphery of the metal corrugated pipe is integrally covered with the non-metallic flexible heat-resistant tube up to the range of the connecting portion including the protrusion of the pipe. A pipe joint in which a collar is externally fitted to a connecting part covered with a flexible heat-resistant tube made of steel, and the collar is caulked on all sides. The pipe joint according to claim 3, wherein the outer periphery of the connecting portion of the pipe is subjected to a furtree process between the protrusion and the joint portion of the metal corrugated pipe.

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