JPS58124889A - Joint for corrugated flexible pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] This invention relates to a joint for d-corrugated square convoluted pipes.

An example of a conventional corrugated rectangular conical pipe joint is shown in FIG. This corrugated rectangular conical tube joint connects a corrugated rectangular conical tube 1 made of synthetic resin and having nine or more ring-shaped concavo-convex strips ta*1b arranged around the outer circumferential surface, which are independent from each other without being spirally continuous. The joint 2 is made of an elastic material such as synthetic rubber, and has a plurality of protrusions 2m around the inner peripheral surface to match the pitches of the grooves 1a of the corrugated rectangular tube 1. By strongly pushing the corrugated rectangular tube 1 into this joint 2, the protrusions 2 on the inner shoulder surface of the joint 2 and the grooves on the outer circumferential surface of the corrugated rectangular tube 1 are formed. I'm trying to match it with 1m.

However, in this joint for a corrugated rectangular tube, the corrugated rectangular tube 1 is pushed in by elastically deforming the ridges 2a on the inner peripheral surface of the joint, so that the grooves 1a and the ridges 2a are engaged. The convex ridges 2m tend to be elastically deformed when rounded or conversely pulled out, resulting in a drawback that sufficient connection strength cannot be obtained.

Therefore, an object of the present invention is to provide a corrugated rectangular conical pipe joint that can provide sufficient connection strength.

An embodiment of this invention is shown in FIGS. 2 to 4. In other words, this joint for corrugated rectangular conical pipes is a joint that can be used to connect corrugated rectangular conical pipes l having a plurality of ring-shaped concavo-convex strips 1a*1b arranged around the outer circumferential surface, which are independent of each other without being continuous in a spiral shape. First, a joint pipe body 3 is provided with a split ring fitting groove 3a around the inner peripheral surface near the opening, and the outer periphery of the corrugated flexible pipe 1 is made of synthetic resin and deformed to reduce its diameter. Concave line IJIK on surface
When fitted, the outer and inner circumferential parts of the joint pipe body 30 are fitted into the fitting groove 3a of the split ring and the groove 1a of the corrugated flexible pipe 1, respectively. It consists of a ring 4.

The split 9 ring 40 split portion 4 is formed obliquely with a predetermined inclination angle with respect to the circumferential direction, so that sufficient expansion/contraction deformation can be performed even if the width of the split portion is set small, and This is to prevent foreign matter from getting caught in the split portion 41.

The diameter of the 30% Schilling fitting groove of the joint pipe body is 3 m, and the diameter is V.
, the diameter of the corrugated flexible tube 1 is d/, and the width of each groove 3a*1 of the joint tube body 3 and the corrugated flexible tube 1 is W.

When the height of the ridges 1b of the corrugated flexible tube 1 is H, the width T, inner diameter d, and outer diameter of the split ring 4 are set as follows.

D=bid=d'-d-+H A taper ff13a is formed at the opening edge of the joint tube body 3,
The corrugated flexible tube 1 is inserted so that it can be pushed in smoothly.

The operation of connecting the corrugated flexible tube 1 using this corrugated flexible tube joint will be described next.

In the steady state, the inner diameter d of the split ring 4 is smaller than the outer diameter of the convex strip 1b of the corrugated flexible tube 1, so it is deformed to expand the diameter a little to fit the concave strip 1aK of the corrugated flexible tube 1. Then, the corrugated flexible tube 1 is pushed into the joint tube body 3.

The outer circumferential surface of the split ring 4 fitted with the grooves 1aK of the corrugated flexible tube 1 protrudes from the outer circumferential surface of the convex stripes 1b of the corrugated flexible tube l, and has a round INK shape. As the pushing into the tubular body 3 is further advanced, the l\t+notation shilling 4 is pressed in the axial direction from the open bottom edge φ tapered surface 3bK of the joint tubular body 3, resulting in diameter reduction deformation as shown in the sixth drawing. Then, it sinks into the groove 11 of the Hatsuke-machi tunnel 1.

When the corrugated flexible tube 1 is further pushed in, the split ring fitting portion of the corrugated flexible tube 1 will be connected to the split ring fitting portion 3m of the joint tube body 30.
When the splitting ring 4 reaches the position, the diameter is expanded and deformed due to the force of the splitting ring 4, as shown in Fig. 6 [F]).
The inner peripheral part is fitted into the concave dik1m of the joint pipe body 3, and the outer peripheral part is fitted into the split ring fitting groove 3m of the joint pipe body 3, so that the corrugated flexible pipe 1 is connected to the joint pipe body 3 without being pulled out.

With this configuration, the joint tube body 3 and the corrugated flexible tube 1 can be connected to each other via the split ring 4 without being pulled out, and a large connection strength can be obtained.

In addition, the connection process is as simple as fitting the split ring 4 into the groove 1b of the corrugated flexible tube 1, and then inserting the corrugated flexible tube 1 into the joint tube body 3. It becomes extremely easy.

As described above, the joint for a corrugated flexible pipe of the present invention has a joint pipe body having an 11-ring fitting groove circumferentially provided on the inner circumferential surface, and a joint pipe body that is deformed in diameter to form a groove on the outer circumferential surface of the corrugated flexible pipe. Since it is round and has a hard elastic split ring to prevent removal, which is fitted and expanded to restore its diameter and fitted into both the grooves on the outer circumferential surface of the corrugated flexible pipe and the split ring fitting groove, the joint pipe body It is possible to obtain sufficient connection strength between the corrugated flexible tube and the corrugated flexible tube, and the connection work is also extremely easy.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a connection state of a corrugated flexible tube according to a conventional example, FIG. 2 is an explanatory diagram showing a connection state of a corrugated flexible tube according to an embodiment of the present invention, and FIG. FIG. 4 is a partially enlarged sectional view of the embodiment, FIG. 5 is a partially enlarged view of a corrugated flexible pipe to which the corrugated flexible pipe joint of the embodiment is applied, and FIG. FIG. 3 is an explanatory diagram of the operation of the BII/i embodiment.

Claims (1)

[Claims] The joint tube has a split ring fitting groove on its inner circumferential surface, and the diameter is reduced to fit into the groove on the outer circumferential surface of the corrugated rectangular tube, and the diameter is expanded and restored to form the groove on the outer circumferential surface of the corrugated rectangular tube. A joint for a corrugated rectangular conical pipe, comprising a hard elastic split ring for preventing removal, which fits into both the split ring fitting groove and the split ring fitting groove.