JP4033254B2 - Pipe connection structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention mainly relates to various alternative pipes for water and sewage works, gas works, etc., temporary pipes temporarily installed for alternative pipes for factory pipe replacement work, buildings and factory interiors. In various piping pipes employed in the above, the present invention relates to a pipe connecting structure for forming a pipe.
[0002]
[Prior art]
Various types of pipes are realized by appropriately connecting metal pipes having appropriate pipe diameters and lengths according to the use and installing desired pipes. And the connection of the metal pipes necessary for the pipe formation is formed by forming a shallow concave line that goes around the pipe in the vicinity of the edge of each metal pipe, and using a joint having a leg portion that engages with the concave line. It is what.
[0003]
Specifically, this joint acts on a ring-shaped seal (made of rubber), two half-moon shaped clamping rings (made of metal) positioned on the outer periphery of the seal, and a method for reducing the inner diameter of the clamping ring. The end faces of adjacent pipes to be connected are precisely aligned, and a ring-shaped seal is fitted over both adjacent pipes, and the metal ring is tightened by operating the tightening bolts. The seal is strongly pressed with a tightening metal ring, and the legs of the tightening metal ring are engaged with the recesses.
[0004]
[Problems to be solved by the invention]
By the way, the pipe connection requires an operation for accurately aligning the end portions of the metal pipes, and the connection operation also serves as a sealing operation by a seal, so that an accurate connection operation is required. Therefore, it is not necessarily excellent in work efficiency. Therefore, the applicant of the present application has proposed a pipe connection structure that is easy to connect and excellent in workability (Japanese Patent Application No. 2001-046236).
[0005]
In the previously proposed pipe connection structure, a sheath pipe into which the other connection target pipe is closely inserted is provided at one pipe end of the connection target, and a locking projection is provided in the vicinity of the end of the other connection target pipe to be inserted. And forming, on the inner peripheral surface in the vicinity of the end portion of the sheath tube, a recess that engages with the locking projection, and an opening end notch that allows the locking projection to advance into the recess. A ring seal that seals the outer peripheral surface of the insertion tube and the inner peripheral surface of the sheath tube when the locking projection is positioned in the concave portion is built in the sheath tube, and the sheath tube is provided with the ring protrusion from the concave portion of the locking projection. A separation prevention mechanism for preventing separation is provided.
[0006]
Accordingly, the present invention further proposes the creation of a structure that is easy to manufacture and that is excellent in operability when the pipe structure is embodied.
[0007]
[Means for solving the problems]
In the pipe structure according to the present invention, a sheath pipe into which the other pipe to be connected is closely inserted is provided at one pipe end of the pipe to be connected, and a locking projection is formed in the vicinity of the end of the other pipe to be inserted. And an engagement groove that engages with the locking protrusion on the inner peripheral surface in the vicinity of the end portion of the sheath tube, and a seal housing groove that is provided behind the engagement groove, and the engagement groove Is formed at the opening end so that the locking projection can advance, and the outer peripheral surface of the insertion tube when the locking projection is positioned at the engagement groove is the seal housing groove. It is sealed with an internal ring seal, and when the engaging recess of the insertion tube is moved from the notch and the engaging recess facing the notch is made empty, the recess recess is closed. In addition, it is characterized in that it is formed by mounting a resin mounting body that fills the open end notch and has a locking structure for the sheath tube or the insertion tube.
[0008]
Accordingly, the locking projection of the insertion tube is inserted from the opening end notch and is positioned in the recess, and is rotated to move the locking projection from the opening end notch, so that the resin mounting body is moved to the opening end notch. The insertion tube is tightly inserted into the sheath tube in a state where the insertion tube is restricted to rotate within a range in which the locking projection can move, and is attached to the ring. It is sealed with a seal, so that the connection work of the metal pipe is made very easy, and the screw connection portion is difficult to loosen.
[0009]
Further, in particular, the resin mounting body is formed in a U-shaped cross section so that the engaging concave portion and the outer peripheral surface portion of the sheath tube are sandwiched by its own elasticity, and the engaging concave portion is formed on the outer peripheral surface of the sandwiched sheath tube. At the same time, a protrusion is provided at a corresponding portion of the resin mounting body to provide a mounting body locking structure.
[0010]
Therefore, it is easy to attach and detach the resin mounting body, and as a result, pipe formation and pipe disassembly work are facilitated.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. The pipe connection structure shown in the embodiment includes a connection target pipe A provided with a sheath pipe 1 into which the other connection target pipe B is closely inserted, and a connection target pipe (insertion pipe) B provided with a locking projection 2. It is configured by a resin mounting body 3 for preventing separation of the target tubes A and B in the connected state.
[0012]
The sheath pipe 1 is attached by welding directly to the pipe end of the pipe A to be connected, or by screw connection, and the like, and the engaging groove 11 and the seal housing groove 12 are provided on the inner peripheral surface. An opening end notch portion 13 is formed by notching a part of the engagement recess 11 on the opening end side.
[0013]
The engaging groove portion 11 is formed so as to correspond to the locking protrusion 2, and the locking protrusion 2 is positioned in the engaging groove portion 11, thereby being connected by mutual locking. This prevents the target tubes A and B from coming off.
[0014]
The seal housing recess 12 is provided in the back of the engagement recess 11 and includes a ring seal 4 internally.
[0015]
The opening end notch portion 13 cuts off a part (about 40 to 60 degrees) of the distal end portion of the sheath tube 1 up to the front end edge of the engaging groove portion 11 so that the engaging groove portion 11 is exposed to the opening end. Is formed.
[0016]
The resin mounting body 3 is formed in a U-shaped cross section, fills the opening end notch 13 and also fills the engaging groove 11 adjacent to the opening end notch 13, and the engagement groove And the outer peripheral surface of the sheath tube are sandwiched by their own elasticity.
[0017]
Further, a locking recess 14 is provided on the outer peripheral surface of the sheath tube 1 held by the resin mounting body 3, and a protrusion 31 is provided at a corresponding portion of the resin mounting body 3.
[0018]
Thus, the insertion tube B is inserted into the sheath tube 1, and the locking projection 2 is advanced from the opening end notch 13 into the engagement recess 11, and then rotated about the axial direction to open. The engaging recess 11 adjacent to the end notch 13 is a void.
[0019]
After that, when the resin mounting body 3 is mounted so as to fill the open end cutout portion 13 that is a space and the engagement groove portion 11 of the space (holding the sheath tube 1), the resin mounting body 3 is The mounting state is maintained by the elasticity of the self and the locking recess 14 and the locking of the protrusion 31, and the insertion tube B can be rotated within a range in which the locking protrusion 2 can move within the engaging groove 11. It is tightly inserted and connected in the sheath tube 1 in a state restricted to movement.
[0020]
Therefore, after inserting the insertion tube B into the sheath tube 1 and rotating it by a predetermined angle, by attaching the resin mounting body 3 to the opening end cutout portion 13 which is the introduction portion of the locking projection 2, the connection target tube A, B can be easily connected to form a desired pipe line.
[0021]
In addition, the present invention is not limited to the above-described embodiment. As illustrated in FIG. 5, the resin mounting body 3 a does not have a single clamping structure, and the opening end notch portion 13 and the cavity engaging recess portion are formed. 11 is formed into a shape that fills only the engagement groove portion 11, and between the outer peripheral portion of the insertion tube B that faces the engaging recess portion 11 and the surface that contacts the outer peripheral portion (the locking concave portion 21, the protruding portion). 32) may be provided, and a resin mounting body may be press-fitted and mounted on the engagement recess 11 in the space. In this case, the mounting body 3a does not have a protruding portion in appearance in conformity with the surface of the sheath tube 1, and it is difficult for the mounting body to be insufficiently detached.
[0022]
【The invention's effect】
As described above, the present invention connects the insertion tube provided with the locking projection and the connection target tube provided with the sheath tube into which the insertion tube is tightly inserted, and performs pipe connection, An engaging recess that engages with the locking projection on the inner peripheral surface in the vicinity of the end of the sheath tube, and an opening end notch that allows the locking projection to advance into the recess are formed. A ring seal that seals the insertion tube and the inner peripheral surface of the sheath tube, and after the insertion tube is inserted into the sheath tube, an opening end notch portion that is a position where the locking protrusion is introduced and an empty space This is a pipe connection structure in which a resin mounting body that closes the engagement concave stripe portion is installed, and the pipe configuration can be easily and reliably implemented.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an embodiment of the present invention.
FIGS. 2A and 2B are structural views of the same sheath tube, where FIG. 2A is a front view and FIG. 2B is a cross-sectional view.
FIG. 3 is a cross-sectional view for explaining a state in which the insertion tube is inserted, where (a) shows before insertion (b) shows after insertion.
FIG. 4 is a cross-sectional view of the mounting body when it is mounted; (a) indicates a mounting body location (b) indicates a locking projection portion;
FIG. 5 is an explanatory diagram of another example.
[Explanation of symbols]
A Connecting tube B Insertion tube 1 Sheath tube 11 Engaging recess 12 Seal receiving recess 13 Opening end notch 14 Locking recess 2 Locking protrusion 21 Locking recess 3, 3a Resin mounting body 31, 32 Part 4 Ring seal

Claims (2)

A sheath pipe into which the other connection target pipe is closely inserted is provided at one end of the connection target pipe, and a locking protrusion is formed in the vicinity of the end of the other connection target pipe to be inserted. On the peripheral surface, there are provided an engaging groove that engages with the locking protrusion, and a seal groove storing groove on the back of the engaging groove, and the engaging groove is exposed and locked to the opening end. An open end cutout that allows the protrusion to advance is formed, and the outer peripheral surface of the insertion tube when the locking protrusion is positioned in the engaging recess is sealed with a ring seal that is embedded in the seal housing recess. When the engaging recess of the insertion tube is moved from the notch and the engaging recess facing the notch is made a void, the cavity recess is closed and the notch is filled, and the sheath tube Or the pipe | tube connection structure characterized by mounting | wearing with the resin mounting body provided with the latching structure to an insertion pipe. The resin mounting body is formed in a U-shaped cross section so that the engagement recess and the outer peripheral surface of the sheath tube are sandwiched by its own elasticity, and a locking recess is provided on the outer peripheral surface of the sandwiched sheath tube The pipe connection structure according to claim 1, wherein a protrusion is provided at a corresponding portion of the resin mounting body to form a mounting body locking structure.

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