JPH0413488Y2 - - Google Patents

Description

[Detailed description of the invention] "Purpose of the invention" The present invention relates to the invention of a pipe joint mechanism with excellent high pressure resistance and flexibility, which effectively copes with the high pressure conditions of the fluid in the pipe, and which also has flexibility and extensibility. The aim is also to provide an outstanding joint mechanism.

(Industrial application field) Pipe fittings with excellent high pressure resistance and flexibility.

(Prior Art) There are two characteristics required of a pipe joint: resistance to high pressure and flexibility, and various proposals have been made to obtain these characteristics. However, in general, materials with high pressure resistance are inferior in flexibility, and conversely, materials with excellent flexibility are inevitably inferior in high pressure resistance. It is difficult to satisfy both high pressure resistance and flexibility.

One of the systems that attempts to satisfy both of these characteristics is a split-type housing in which a packing 11 with a U-shaped cross section is attached between the ends of the pipes to be connected, and this packing 11 is received, as shown in FIG. 12 is formed with a locking protrusion 15 that engages with a shoulder-like engagement step 14 formed at the end of the tube body 13.

In addition, this one is a particularly thick tube body 13.
In a, as shown in FIG.
Instead, a groove-shaped recess 16 may be formed and the engagement step 14a in the recess 16 may be used.

That is, these products have a U-shaped cross-section packing 11 to provide considerable flexibility to the connected pipe bodies 13, 13, and
The outside of the shaped packing is supported by the receiving recess of the housing 12, and the tip of the packing is crimped to the pipe body to form a seal, so it has the characteristic of not leaking even when the pipe internal pressure becomes high enough. .

(Problems to be Solved by the Invention) However, even the products shown in FIGS. 5 and 6 are not necessarily satisfactory in terms of high pressure resistance and flexibility.
That is, the details of this relationship are as shown in FIG. 7, and when high pressure acts inside the tube, the outside of the packing 11 is pushed out into the gap e between the outer surface of the tube body 13 and the inner surface of the housing 12, and In this state, vibrations caused by the flow of fluid in the pipe or the like act on the packing, which is pushed out into the space e, and damages it.

The above-mentioned disadvantages can be overcome to some extent by reducing the distance e between the inner surface of the housing and the tube body, but if the distance e is made minute in this way, the connected tube bodies 13 As a result, almost no flexibility can be obtained between the U-shaped packing 1
Most of the advantages of using 1 are lost.

That is, this method has the same disadvantages as the case where the packing material is generally sealed by applying pressure.

"Structure of the invention" (Means for solving the problem) A packing having a U-shaped cross section and a split-type housing for accommodating the packing are covered between the ends of the pipes to be connected, and the housing is formed into a pipe body. The housing is engaged with the engagement step and tightens the divided housing part body, and a protrusion that joins and supports the engagement step is provided on the outer corner of the housing on both sides of the packing. A recess is formed between the protrusion and the above-mentioned locking protrusion for the tube, the recess having a width equivalent to three times or more the width of the protrusion and receiving the engagement step. Pipe joint mechanism with excellent high pressure resistance and flexibility.

(Function) The protrusion formed on the inner surface of the housing connects and supports the outer corner of the packing up to the part close to the circumferential surface of the tube, so that even when high pressure is applied inside the tube, the packing does not touch the tube and this protrusion. With the department
Effectively prevents protrusion between the parts and provides high pressure resistance.

In a recessed part formed between the protrusion and a locking protrusion for the engagement step of the tube body, the recess has a width three times or more the width of the protrusion and is formed to receive the engagement step. When the body is bent, the engagement step portion is received, and relatively large flexibility is achieved between the connected tube bodies. That is, the end portion of the tube has great flexibility in the U-shaped packing portion in cross section, and the width of the protrusion is narrow, less than one third of the width of the recess, so that the center of the tube is In this recessed portion, even the engagement step portion outside the recessed portion has appropriate flexibility, so that both connected tube bodies have sufficient flexibility. In other words, since the protrusion is narrow as described above, it simply acts as a pivot point during the flexibility action, and hardly inhibits the flexibility action.

(Embodiment) To explain a specific embodiment of the invention according to the above-mentioned invention as shown in the attached drawings, FIG. A case where a joint part 6 is formed is shown,
FIG. 2 shows a pipe joint according to the present invention in which a shoulder-like engagement step 6 is formed by forming a groove-like recess 10 near the end of the pipe body 3 instead of attaching a ring-like locking member 7. In each figure, 1 is a housing and 2 is a packing. On the inner surface of the housing 1, there are protrusions 4 that are joined and supported on the outer corners 9 on both sides of the packing 2. are formed respectively, and a recessed portion 5 for receiving the engagement step 6 is formed between these projections 4 and a locking projection 18 that locks into the shoulder-like engagement step 6 described above. 4, the housing 1 is divided into a plurality of parts as shown in FIG.
9 is starting to tighten. The housing 1 is formed with protrusions vertically and horizontally to provide a predetermined strength.

The specific function of the device according to the present invention as described above is as shown in FIG. 4 together with FIG. 1 or 2, and in the state shown in FIGS. Since the parts 4, 4 are joined to the outer corner 9 of the packing 2 sufficiently deep and close to the circumferential surface of the tube body 3, the outer corner 9 of the packing 2 can be connected even when the fluid pressure inside the tube becomes high. is effectively prevented from being extruded between the protrusion 4 and the tube body.
On the other hand, in the state shown in FIG. 4 in which the axes of the tubes 3, 3 are bent, the shoulder-like engagement step 6 enters the recess 5, so a large bend is obtained between the tubes 3, 3. It is clear that great flexibility is obtained. Moreover, in this case, the width of the protrusion 4 is sufficiently narrow due to the formation of the recess 5, so that even if the above-mentioned large bending occurs, the protrusion 4 and the tube body 3 (see FIG. In this case, the gap e' that occurs between the ring-shaped locking member 7) is very small and does not increase as much as in the cases shown in Figures 1 and 2, so it still maintains high pressure resistance and the locking The outer corner 9 of 2 is prevented from entering into 〓e' during this time.

"Effects of the Invention" According to the present invention as explained above, it is possible to ensure favorable pressure resistance characteristics by the protruding part 4, and also to obtain great flexibility in the recessed part 5, and to maintain this flexible state. It is possible to maintain stable high pressure resistance even in the case of
This is a highly effective design in practical terms because it effectively utilizes the characteristics of shaped packing to obtain an appropriate sealing effect.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention, and FIG. 1 is a sectional view showing one embodiment of the invention, FIG. 2 is a partial sectional view of another embodiment, and FIG. Figure 3 is its side view, Figure 4
The figure is an explanatory diagram showing the working relationship, FIG. 5 is a sectional view of one example of a conventional pipe joint mechanism, FIG. 6 is a similar sectional view of another example, and FIG. 7 is a sectional view of one example of a conventional pipe joint mechanism. FIG. 2 is a cross-sectional explanatory diagram showing the behavior relationship when internal pressure acts on packing in an object. In these drawings, 1 is a housing, 2 is a packing, 3 is a tube to be connected, 4 is a protrusion, 5 is a recess for receiving an engagement stage, 6 is a locking protrusion, and 7 is an engagement stage. , 8 indicates the inner lip of the packing, and 9 indicates its outer corner.

Claims (1)

[Scope of utility model registration request] A packing having a U-shaped cross section and a split-type housing for accommodating the packing are covered between the ends of the pipes to be connected, and the housing is locked to an engaging stepped portion formed on the pipe body, and the split housing part In the case where the body is tightened and protrusions that join and support the engagement step are provided on the outer corners of the housing on both sides of the packing, between the protrusions and the locking protrusions for the pipe body. 1. A pipe joint mechanism having excellent high pressure resistance and flexibility, characterized in that a recessed portion having a width equivalent to at least three times the width of the protruding portion and receiving the engaging stepped portion is formed in the recessed portion.