JPS6318874Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a vector-type pipe joint.

[Conventional technology]

Conventional vector-type pipe fittings require a shoulder at the end of the pipe to engage with the end of the fitting housing, and for pipes with smooth ends, a separate ring is required at the piping site. Piping work such as welding the body was troublesome.

[Problem that the invention attempts to solve]

The present invention provides a vector-type pipe joint that can be relatively easily engaged and connected to a pipe.

[Means for solving problems]

The gist of the present invention is to provide a pipe joint for joining pipes having an annular groove on the outer circumferential surface of the end thereof, which includes: (a) a pair of housings that are divided in the axial direction, and a first annular recess on the inner surface thereof; and a second annular recess at both ends thereof; (b) a packing having inward lips formed at both ends thereof, the packing being accommodated in the first annular recess and facing to be connected; (c) an annular biting ring cut at one point, the inner diameter end of which is located on the axial side of the outer diameter end, and the outer diameter end of which is attached to the second pipe; The tube joint is a pipe joint that loosely fits into the inner wall of the annular recess of the tube, and has a biting ring at the inner diameter end that engages with the annular groove of the tube.

[Effect]

Therefore, the packing accommodated in the first annular recess achieves a sealing effect on the fluid in the pipe, and the biting ring loosely fitted into the second annular recess generates deformation stress that is applied to the pipe. It absorbs the deformation of the tube and reliably prevents the tube from coming off.

〔Example〕

Examples will be illustrated and explained below. Figure 1 shows the front view of the housing, which is divided into two parts 1 and 1' in the radial direction.
are connected by bolts 2 and nuts 3 inserted into the bolt seats on the sides. FIG. 2 is a longitudinal cross-sectional view in the tube axis direction, showing the state in which the tubes are connected. A packing chamber is formed in the center of the housing 1, 1' by an outer peripheral wall 4 and a conical side wall 5. An annular packing 6 made of an elastic material is installed in the chamber so as to straddle the opposing pipes 17, 17' for connection. Lips 7 and 7' facing inward in the tube axis direction are formed at both ends of the inner circumferential side of the packing 6, and are in close contact with the outer circumferential surfaces of the end portions of the tubes 17 and 17', respectively. The center part 8 of the packing 6 is reduced in the radial direction by forming a gap 9 on the outer circumferential side, and the gap 10 on the lip 7 side is made smaller to prevent the lip 7 from becoming excessively large when the pressure inside the pipe becomes negative. This prevents deformation. An end chamber having a tapered side wall 11 and a parallel peripheral wall 12 is provided on both sides of the packing chamber of the housing 1, 1', and when assembled in this end chamber, the side wall 11 and the peripheral wall 12 and a tapered surface 14 and a parallel outer peripheral surface 15 on the outer diameter side in a loosely fitted state.
A conical ring-shaped biting ring 13, 13' having a cross-sectional shape tapering toward the inner diameter side is attached. The biting rings 13, 13' are notched at one place on the circumference, and in a free state, the inner diameter, which is smaller than the outer diameter of the tube, is pushed out and attached to the tubes 17, 17'.
Its inner diameter end 16 is engaged with grooves 18, 18' on the outer surface of the tube. The biting rings 13, 13' are made of hard metal, and the hardness of the cutting edge is made of hardened steel.
The one with HV500-550 is good. The cutting edge is the inner diameter end 1
6 should be sharpened to a width of about 200 microns in the tube axis direction. The groove 18 of the tube 17 for locking the inner diameter end of the biting ring 13 is formed in a V-notch shape or the like in cross section at a position separated from the tube end by the surface of engagement with the lip 7 of the packing 6.

FIG. 3 shows another embodiment, in which the biting ring 19 has the same thickness at each part and is shaped like a letter in cross section. In this case as well, the tapered surface 20 of the folded portion on the outer diameter side is the side wall 1 of the end chamber of the housing 1.
1 in a loosely fitted state, and the inner diameter end 21 is engaged with the groove 18 of the tube 17 as in the previous example.

The bite rings 13, 19 are preferably made of hardened steel or the like with a hardness of HV500 to 550. The groove 18 in the pipe 17 may be easily formed on-site.
It is sufficient that the inner diameter ends of the biting ring 13 etc. are engaged at the stage when the housings 1, 1' are fastened.

[Effect of idea]

In this way, the outer diameter end of the biting ring engages with the end chamber (second annular part) of the housing in a loosely fitted state, so the reaction force of the biting ring is not applied to the housing, making it easy to assemble the housing into the piping. It is possible to do this. In addition, even if axial elongation or bending stress is applied due to thermal expansion of the pipe after piping, the part that moves toward the center of the housing is connected in a loosely fitted state only by the packing accommodated in the first annular recess. The deformation stress applied to the piping can be absorbed and the seal can be maintained without the biting ring coming off the groove of the pipe. Also tube 17
When the biting ring 13, etc. acts in the detachment direction due to some external force, the outer diameter side of the biting ring 13, etc. is supported by the end chamber of the housing, so it deforms into a flat plate shape perpendicular to the tube axis using the outer diameter end as a fulcrum, and the inner diameter 13, etc. shrinks. The groove 18 of the tube is further cut into the groove 18 to reliably prevent the tube from coming off.

As described above, the pipe joint according to the present invention allows easy piping work, absorbs the stress of the pipe, and has a large holding power against pipe withdrawal, and is suitable for connecting relatively large diameter pipes.

[Brief explanation of the drawing]

FIG. 1 is a front view of a pipe joint according to an embodiment of the present invention, FIG. 2 is a longitudinal side view of the same, and FIG. 3 is a partial longitudinal side view of another embodiment. 1, 1': Housing, 6: Packing, 7,
7': Lip, 13,13': Biting ring, 1
8, 18': Groove, 19: Biting ring.

Claims (1)

[Claims for Utility Model Registration] A pipe joint for joining pipes having an annular groove on the outer circumferential surface of the end, the pipe fitting comprising: (a) a pair of housings divided in the axial direction, with a first housing on the inner surface thereof; (b) a housing having an annular recess and second annular recesses at both ends thereof, and (b) a packing having inward lips formed at both ends thereof, the packing being housed in the first annular recess and facing to be connected. (c) an annular biting ring cut at one point, the inner diameter end of which is located axially inward than the outer diameter end; A pipe joint having a biting ring that loosely engages with the inner wall of the second annular recess, and the inner diameter end engages with the annular groove of the pipe.