JPH0522713Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of industry] The present invention relates to an improvement of a bellows type pipe joint.

[Prior art]

For liquid supply pipes such as fuel pipes that are bent and installed in a narrow space, bellows-type fittings are used at the pipe connections to absorb dimensional errors. be. Since the bellows body of such bellows-type pipe joints is made of a thin metal plate, etc., the outer periphery is covered with a wire braid through a liner such as resin to protect it from damage caused by contact with external obstacles. I have to.

FIG. 14 shows such a conventional bellows-type pipe joint, in which a bellows body 11 formed into a bellows shape from a thin metal plate has sleeves 14,
The sleeve 14 is connected to the ends of the two pipes P and P', and the outer periphery of the bellows body 11 is covered with a wire braid 13 via a liner 12 made of resin. In the conventional bellows type pipe joint, the wire braid 13 has both ends connected to the sleeves 14, respectively.
It had a structure in which it was integrally welded and fixed to the upper annular fitting 15 and integrated with the bellows body 11.

Because of this structure, when inspecting the inner liner 12 for wear or damage caused by rubbing against the bellows body, it is necessary to push the stitches of the wire braid 13 apart and look through them, which makes the inspection work easier. It was very cumbersome and prone to uncertainty. Another problem was that if the liner was damaged, it could not be replaced as is, and the entire joint had to be replaced.

[Purpose of invention]

The purpose of this invention is to provide a bellows-type pipe joint that solves the conventional problems as described above, and that not only makes it easier to inspect the liner for wear and damage, but also makes it easier to replace the liner. It's about doing.

[Structure of the invention] The present invention achieves the above object by covering the outer periphery of the bellows body with a wire braid through a liner,
This bellows-type pipe joint in which both ends of the wire braid are fixed to both ends of the bellows body is characterized in that the fixing portions between the bellows ends and the wire braid ends are configured to be detachable, so that the wire braid can be removed from the bellows. It is something to do.

The present invention will be explained below with reference to embodiments shown in the drawings.

Fig. 1 shows an assembly of a bellows type pipe joint according to an embodiment of the present invention, Fig. 2 shows the bellows main body side of this assembly, and Fig. 4 shows the wire braid side separately. It is.

In this embodiment, 1 is a bellows body formed into a bellows shape from a thin metal plate, 2 is a liner formed into a tubular shape from a wear-resistant resin such as fluororesin, and 3 is a wire braid formed into a tubular shape using wire. .

The bellows body 1 has tubular sleeves 4, 4 welded to both ends thereof, and these sleeves 4,
4 are respectively connected to the ends of two pipes P and P' which are connected objects. An annular metal fitting 5 is welded to the sleeve 4, and this annular metal fitting 5
A plurality of tabs 6 are welded at regular intervals to the outer periphery of. This tab 6 is provided with a female thread S for screwing a bolt 9 which will be described later. (See Figures 2 and 3) On the other hand, the wire braid 3 has strip rings 7, 7 fixed by welding to both ends. A plurality of locking holes 8 are bored at regular intervals on the circumference of the strip ring 7, and the locking holes 8 correspond to the positions of the tabs 6. (See Fig. 4) To assemble the bellows main body 1 and the wire braid 3 configured as described above, as shown in Fig. 1, the outer periphery of the bellows main body 1 is covered with the liner 2, and then the wire braid 3 is placed on top of the liner 2. After that, align the locking holes 8 of the strip rings 7 at both ends with the tabs 6 on the bellows body 1 side, and tighten the bolts 9 with female thread S.
It may be fixed by screwing it into place. Also,
Conversely, when removing the wire braid 3 from the bellows body 1, the bolt 9 may be loosened.

In this way, the wire braid 3 is connected to the bellows body 1.
Since the liner 2 can be attached and detached freely, wear of the liner 2,
Inspection for damage etc. can be easily and reliably carried out by removing the wire braid 3 or by shifting it in the longitudinal direction. Also,
This also makes it easier to replace the liner 2.

5 to 8 show other embodiments of the present invention. In this embodiment, a through hole 9a is provided in the head of each bolt 9, and wires 10 are inserted through the through holes 9a of all the bolts 9 and tied in an annular shape. By inserting the wire 10 in this manner, it is possible to prevent the bolt 9 from loosening or falling off.

9 to 11 show still other embodiments of the present invention. In this embodiment, the locking hole 8 provided in the strip ring 7 in each of the above-mentioned embodiments is replaced with a locking notch 8' that extends through the end edge. By changing to the locking notch 8' in this way, the wire braid 3 can be removed as shown by arrow A in Figure 9 by simply loosening the bolt 9, without having to completely remove it. , or slide it. Therefore, the inspection work of the liner can be further simplified. This locking notch 8' is shown in FIGS. 12 and 13.
It may also be formed into a key shape as shown in the figure.

[Effect of idea]

As mentioned above, in the bellows-type pipe joint of the present invention, the wire braid is detachable from the bellows body, so when inspecting the liner for wear or damage, the wire braid can be easily removed from the bellows body. This also makes it easier to replace the liner.

[Brief explanation of drawings]

Fig. 1 is a side view showing a bellows-type pipe joint according to an embodiment of the present invention in half cross section, and Fig. 2 shows a partial cross section of the bellows body side of the joint with the wire braid side separated. 3 is a side view of FIG. 2, FIG. 4 is a side view showing the wire braid side partially in section, and FIG. 5 is a main part of a joint according to another embodiment of the present invention. 6 is a view in the direction of the arrow in FIG. 5, FIG. 7 is a view in the direction of the arrow in FIG. FIG. 10 is a vertical sectional view showing the main parts of a joint according to still another embodiment of the present invention, FIG. 10 is a view taken in the direction of the arrow in FIG. 9, FIG. Fig. 12 is a plan view corresponding to Fig. 10 according to another embodiment, Fig. 13 is a plan view showing the end of the wire braid in the same embodiment, and Fig. 14 shows a conventional bellows type pipe joint in half section. FIG. 1... Bellows body, 2... Liner, 3...
Wire braid, 4... Sleeve, 5... Annular metal fitting, 6... Tab, 7... Strip ring, 9...
...Bolt, S...Female thread.

Claims (1)

[Scope of utility model registration request] In a bellows-type pipe joint in which the outer periphery of a bellows body is covered with a wire braid via a liner, and both ends of the wire braid are fixed to both ends of the bellows body, the fixing parts between the bellows ends and both ends of the wire braid are configured to be detachable. , a bellows-type pipe joint characterized by a wire braid that can be removed from the bellows.