JPH035753Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a metal flexible tube to which a fitting can be simply and reliably fixed to the end.

[Conventional technology]

In conventional metal flexible tubes, a part of the fitting is butted against the end of the corrugated metal tube, and the end of the corrugated tube and the fitting are welded together to form a hermetically sealed unit. , also the fourth
As shown in the figure, one to several peaks at the end of the corrugated pipe are compressed and flattened in the longitudinal axis direction to form a ring-shaped engagement piece, and this engagement piece is locked to a cap nut screwed onto the nipple. and one in which a gasket is interposed between the nipple and the engagement piece, and they are integrated by screwing together with a cap nut;
Furthermore, as shown in Fig. 5, the end of the corrugated tube is extended into a pipe shape, and only one peak at the tip is made into a flat mountain shape to serve as an engagement piece, and a packing is interposed between this engagement piece and the nipple, and the cap nut is tightened. There are some things that are unified by conclusion.

[The problem that the idea aims to solve]

However, in the case of welded or brazed type pipes as shown in Figure 3, the heating during welding can cause the pipe material to be affected by heat, resulting in deterioration or oxidation of the material, and to prevent this, atmospheric gas or Welding in a vacuum requires equipment and costs.

In addition, as shown in Figures 4 and 5, the non-welded type requires a cap nut and requires machining of the tube ends, which creates stress and requires heat treatment. There are disadvantages such as not having

The purpose of this invention is to simply and reliably join the joint fittings by caulking them through an O-ring.

[Means to solve the problem]

The present invention was made to achieve the above object, and includes an O-ring that is fitted into one of the valleys at the end of a metal annular corrugated pipe, and the inner peripheral surface of the holding part of the nipple that presses the O-ring. A concave groove is formed in the inner circumferential surface of the corrugated tube to fit the peak part on the far side from the valley part where the O-ring of the corrugated pipe is fitted, and the holding part at the tip of the concave groove is used as a holding piece, The holding part is crimped from the outer circumferential direction, an O-ring is crimped on the inner peripheral surface of the holding part, and the corrugated pipe crest is held in the concave groove, and the trough is held in the holding piece. The main purpose is to form a unified body.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, reference numeral 1 denotes an annular corrugated tube made of metal such as stainless steel, copper, or aluminum. are arranged alternately.

Reference numeral 2 denotes a fitting such as a nipple to be joined to the end of the corrugated pipe 1, and this fitting 2 has a hexagonal or square nut part 21 integrally attached to its outer periphery so that it can be screwed with a tool such as a spanner. A male thread 22 is provided on the outer periphery of one end, a cylindrical holding portion 23 is provided on the other end, and a groove 24 is provided at the tip of the inner peripheral surface of this holding portion 23. This groove 24 fits into the outer periphery of one of the peaks of the corrugated tube located at the back side of the valley in which the O-ring is fitted, and the size, curvature, etc. of the groove are determined so as to hold this. It will be done. A ring-shaped holding piece 25 is formed on the inner circumferential surface of the concave groove 24 on the distal side thereof, and the ring-shaped holding piece 25 fits into and locks the groove of the corrugated tube. 3 is an O-ring having a size that fits into the groove 12 of the corrugated pipe.

To join a fitting (nipple) to one end of the annular corrugated pipe 1 formed in this way, first fit the O-ring 3 into one trough 12 at the end of the corrugated pipe 1, and then attach the fitting to the fitting. This O is inside the holding part 23 of 2.
Insert the end of the corrugated tube with the ring fitted into it. At this time, the groove 24 and one peak 11 of the corrugated tube are aligned. Next, by squeezing and crimping the holding part 23 from the outer periphery, the diameter of the holding part becomes small, and while the O-ring 3 is flattened and crimped, the peak part is fitted into the concave groove, and the holding piece is fitted into the valley part. and are held together as one.

At this time, since an O-ring is interposed between the corrugated tube and the holding portion, watertightness is maintained.

[Effect of idea]

In the metal flexible tube of the present invention, an O-ring is fitted into one of the valleys at the end of the metal annular corrugated tube, and the O-ring is crimped on the inner circumferential surface of the holding part of the nipple, which is deeper than the crimping surface of the O-ring. A concave groove is formed on the side to fit the crest of the corrugated tube, and the holding portion is crimped from the outer circumferential direction of the O-ring, and the tip is held by holding the crest of the corrugated tube. Since the troughs are held in one piece and integrated, the fittings can be easily joined without welding or using cap nuts, and there is an advantage that sealing can be performed completely with an O-ring.

[Brief explanation of the drawing]

The drawings show the joint part at the end of the metal flexible tube according to the present invention. Figure 1 is a front view of the upper half section, Figure 2 is a sectional view showing the joint, Figures 3 and 4.
FIG. 5 is a known example. 1 is a corrugated tube, 11 is a peak, 12 is a trough, 2 is a fitting, 23 is a holding portion, 24 is a groove, 25 is a holding piece, and 3 is an O-ring.

Claims (1)

[Scope of utility model registration request] Fit an O-ring into one of the valleys at the end of the metal annular corrugated tube, and fit the O-ring of the corrugated tube to the inner circumferential surface of the nipple that is further back than the inner circumferential surface of the holding part of the nipple to which this O-ring is crimped. A concave groove is formed into which the peaks on the inner side of the troughs are fitted, and the holding part at the tip of this groove is used as a holding piece, and the holding part is crimped from the outer circumferential direction to fit inside the holding part. A metal flexible tube that is integrally formed by crimping an O-ring on the circumferential surface, holding the corrugated tube crest in a groove, and holding the trough with a holding piece.