HK1196418A1 - Pipe connector - Google Patents

Abstract

A pipe joint is configured so that, even if a creep phenomenon occurs in a pipe body, the pipe joint retains high strength for resisting the dislocation of the pipe body. A pipe body (B) is inserted into an insertion space (S) adapted for the insertion of the pipe body (B) and formed along the outer peripheral surface (1a) of a nipple (1). In this state, a sleeve (4) is reduced in diameter and deformed by moving a first sloped surface (2) and a second sloped surface (3) relative to each other so that the first sloped surface (2) and the second sloped surface (3) approach each other. As a result, the outer surface (B2) of the pipe body (B) is partially compressively deformed by the inner peripheral surface of the sleeve (4) and at the same time the portion of the outer surface, the volume of which corresponds to the compressive deformation, is deformed and swollen from the front end outer peripheral portion (B3) of the pipe body (B) toward an annular recess (5) and fitted into the annular recess (5). The deformed and swollen front end outer peripheral portion (B3) of the pipe body (B) is caught by a stepped section (5a), and the entire pipe body (B) is held so that the pipe body (B) cannot move in the opposite direction (U) to the insertion direction (N) of the pipe body (B).

Description

Pipe connector

Technical Field

The present invention relates to a pipe connector used for connecting pipe bodies such as flexible hoses and pipes made of soft materials such as synthetic resins and rubbers.

Background

Conventionally, as this type of pipe connector, there is disclosed a pipe connector including: a connector body having a concave ring groove into which an end of a connection pipe is fitted and provided on one side thereof, an end surface of an outer wall of the concave ring groove being an inwardly concave inclined surface, and an inner wall side thereof being extended to serve as an inner cylinder, and a plurality of engaging grooves being provided around an outer peripheral surface of the inner cylinder; a cap nut having an inner surface as a reverse slope corresponding to the slope of the connector body; and a wedge ring having both ends formed by providing grooves inclined at a predetermined angle with respect to an axial direction in communication with an inclined surface of the connector body and an inclined surface corresponding to an inverse inclined surface of the cap nut, wherein the end of the connection pipe is inserted into the annular groove, the cap nut is screwed and fastened to the screw portion of the connector body, and the wedge ring is pressed between the inclined surface of the connector body and the inverse inclined surface of the cap nut, whereby the wedge ring is retracted into the grooves, a plurality of racks protruding from an inner peripheral surface of the wedge ring are recessed into an outer peripheral surface of the connection pipe, and the inner peripheral surface of the connection pipe pressed is fitted into the engaging groove of the inner cylinder (see, for example, patent document 1).

Prior art documents

Patent document

Patent document 1: japanese Kokai publication Sho 57-182691

Summary of the invention

Problems to be solved by the invention

In such a conventional pipe connector, the wedge ring is deformed to be reduced in diameter by the approaching movement of the opposing inclined surfaces, and the inner peripheral surface of the wedge ring is brought into contact with the outer peripheral surface of the connection pipe.

However, if the connection pipe is a synthetic resin hose, a pipe, or the like, and a creep (permanent deformation) phenomenon occurs in a pressure-contact portion with the wedge ring due to a change with time, and the thickness of the pressure-contact portion becomes thin, there is a problem that not only the pipe body is easily detached, but also fluid is easily leaked from between them.

In order to solve such a problem, it is conceivable to provide an elastically deformable annular seal member on the outer peripheral surface of the inner tube facing the inner peripheral surface of the connection pipe so that the tip end thereof is recessed into the inner peripheral surface of the connection pipe. However, in this case, since the thickness of the inner tube is increased by the thickness of the seal member, there is a problem that not only the flow rate through the inner tube is reduced, but also a step difference generated between the inner tube and the inner peripheral surface of the connection tube by accumulation of dross or the like is caused, which causes contamination (contamination).

The present invention has been made to solve the above problems, and an object of the present invention is to maintain high peel strength even when a creep phenomenon occurs in a pipe body.

Means for solving the problems

In order to achieve the object, the present invention includes: a nipple provided along an insertion space of the flexible pipe body; a cylindrical member provided in the insertion space of the pipe body so as to radially face an outer peripheral surface of the nipple with the nipple interposed therebetween, and having a1 st inclined surface formed so that an inner diameter thereof gradually decreases in an insertion direction of the pipe body; a tightening member provided so as to face the outer peripheral surface of the threaded nipple in a radial direction with the insertion space of the pipe body interposed therebetween, so as to face the 1 st inclined surface in the insertion direction of the pipe body, so as to be movable back and forth in the insertion direction of the pipe body with respect to the 1 st inclined surface, and having a 2 nd inclined surface formed so that an inner diameter thereof gradually decreases in a direction opposite to the insertion direction of the pipe body; and a sleeve that is provided so as to face the outer peripheral surface of the threaded connection pipe in a radial direction with the insertion space of the pipe body interposed therebetween, that is capable of reciprocating in the insertion direction of the pipe body between the 1 st inclined surface and the 2 nd inclined surface and that is capable of elastic deformation in the radial direction, that is formed so as to be deformed so as to be reduced in diameter as the 1 st inclined surface and the 2 nd inclined surface move relatively closer to each other, that is formed so as to be provided with an annular recess portion on a back side of the sleeve in the insertion direction of the pipe body so as to face the insertion space of the pipe body in the radial direction through a stepped portion, that is formed so as to have a diameter larger than an inner diameter at the time of reducing the sleeve, and that is formed so as to be fitted into the annular recess portion by being expanded and deformed in an outer peripheral portion of a tip end of the pipe body.

Effects of the invention

In the present invention having the above-described features, in a state where the pipe body is inserted into the insertion space of the pipe body formed along the outer peripheral surface of the nipple, the 1 st inclined surface and the 2 nd inclined surface move relatively close to each other to reduce the diameter of the sleeve, whereby the outer surface of the pipe body is locally compressed and deformed on the inner peripheral surface of the sleeve, and at the same time, the outer peripheral portion of the tip of the pipe body expanded and deformed by an amount corresponding to the capacity of the compression deformation is projected and deformed from the outer peripheral portion of the tip of the pipe body toward the annular concave portion to be fitted into the annular concave portion, and the outer peripheral portion of the tip of the pipe body expanded and deformed is.

Therefore, even if a creep phenomenon occurs in the pipe body, the drop strength can be maintained high.

As a result, compared to a conventional pipe connector in which the inner circumferential surface of the wedge ring is pressed against the outer circumferential surface of the connection pipe by reducing the diameter of the wedge ring by the approaching movement of the opposing inclined surfaces, the pipe connector can prevent the drop-out of the pipe body for a long period of time regardless of the creep phenomenon of the pipe body, thereby improving safety.

Drawings

Fig. 1 is a vertical cross sectional front view showing a pipe connector according to an embodiment of the present invention, wherein (a) shows a state before a1 st inclined surface and a 2 nd inclined surface move, and (b) shows a state after the 1 st inclined surface and the 2 nd inclined surface move closer to each other in a partially enlarged manner.

Fig. 2 is a perspective view of the pipe connector according to the embodiment of the present invention, wherein (a) shows an overall exploded state, and (b) is a perspective view of only the sleeve viewed from the opposite direction.

Fig. 3 is a vertical sectional front view showing a pipe connector according to another embodiment of the present invention, wherein (a) shows a state before the 1 st inclined surface and the 2 nd inclined surface move, and (b) shows a state after the 1 st inclined surface and the 2 nd inclined surface move closer to each other in a partially enlarged manner.

Fig. 4 is a vertical cross sectional front view showing a pipe connector according to another embodiment of the present invention, in which (a) shows a state before the 1 st inclined surface and the 2 nd inclined surface move, and (b) shows a state after the 1 st inclined surface and the 2 nd inclined surface move closer to each other in a partially enlarged manner.

Fig. 5 is a vertical cross sectional front view showing a pipe connector according to another embodiment of the present invention, wherein (a) shows a state before the 1 st inclined surface and the 2 nd inclined surface move, and (b) shows a state after the 1 st inclined surface and the 2 nd inclined surface move closer to each other in a partially enlarged manner.

Fig. 6 is a perspective view of the pipe connector according to the embodiment of the present invention, wherein (a) shows an overall exploded state, and (b) is a perspective view of only the sleeve viewed from the opposite direction.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in fig. 1 to 6, a pipe connector a according to an embodiment of the present invention includes, as main components: a nipple 1 provided along an insertion space S of a flexible pipe body B; a cylindrical member 20 provided so as to radially face the outer peripheral surface 1a of the nipple 1 across an insertion space S of the pipe body B; a fastening member 30 provided so as to be opposed to the outer peripheral surface 1a of the nipple 1 in the radial direction across the insertion space S of the pipe body B and to be capable of reciprocating in the axial direction of the nipple 1 with respect to the 1 st inclined surface 2; and a sleeve 4 which is provided so as to be opposed to the outer peripheral surface 1a of the nipple 1 in the radial direction, is provided so as to be capable of reciprocating between the 1 st inclined surface 2 and the 2 nd inclined surface 3 in the axial direction of the nipple 1, and is elastically deformable in the radial direction.

The cylindrical member 20 has a1 st inclined surface 2 formed so that the inner diameter gradually decreases toward the axial direction of the nipple 1.

The fastening member 30 has a 2 nd inclined surface 3 formed such that the inner radial direction 1 st inclined surface 2 is gradually reduced in the opposite direction.

As shown in fig. 1 (a), the connection end Ba disposed at one end of the pipe B is inserted into the insertion space S of the pipe B formed in a cylindrical shape along the outer peripheral surface 1a of the nipple 1 in a state where the 1 st inclined surface 2 of the tubular member 20 and the 2 nd inclined surface 3 of the fastening member 30 are separated in the axial direction of the nipple 1.

Thereafter, as shown in fig. 1 (b), the 1 st inclined surface 2 of the tubular member 20 and the 2 nd inclined surface 3 of the fastening member 30 are moved so as to be relatively close to each other, whereby the sleeve 4 is interposed between the 1 st inclined surface 2 and the 2 nd inclined surface 3 to be deformed while being reduced in diameter. Accordingly, the inner peripheral surface of the sleeve 4 is pressed against the outer surface B2 of the connection end Ba of the pipe body B inserted into the insertion space S of the pipe body B to be locally compressed and deformed, and at the same time, the distal end outer peripheral portion B3 of the connection end Ba of the pipe body B is expanded and deformed, so that the connection is maintained so as not to fall off in the direction U opposite to the insertion direction N of the pipe body B.

The threaded joint 1 is formed into a cylindrical shape having an outer diameter substantially the same as or slightly larger than an inner diameter of a pipe body B to be described later, or formed into a cylindrical shape having an outer diameter substantially the same as or slightly larger than the inner diameter and a thin wall thickness by performing press working or other forming work on a plate material made of a deformable rigid material such as stainless steel.

Further, it is preferable that the retaining concave-convex portion 1B facing the inner surface B1 in the connection end Ba of the pipe body B described later and the abutting portion 1c facing the front end surface B4 in the connection end Ba in the vicinity of the rear end in the insertion direction N of the pipe body B (hereinafter referred to as "pipe insertion direction N") are formed on the outer peripheral surface 1a of the nipple 1.

In the illustrated example, the retaining concave-convex portion 1b is formed in a male screw shape in which annular concave portions and annular convex portions are alternately continuous at an intermediate position in the axial direction of the outer circumferential surface 1a of the nipple 1.

As another example, although not shown, the outer peripheral surface 1a of the nipple 1 may be formed as a smooth surface.

The cylindrical member 20 is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the pipe body B described later, and is integrally formed outside the nipple 1 so as to be double-cylindrical, thereby being arranged so as not to move in the pipe insertion direction N, or the cylindrical member 20 formed separately from the nipple 1 so as to be double-cylindrical is inserted outside the nipple 1, thereby being integrally attached so as not to move in the pipe insertion direction N.

A1 st inclined surface 2 whose inner diameter gradually decreases in the pipe insertion direction N is formed on the inner peripheral surface of the cylindrical member 20 so as to face the outer peripheral surface 1a of the nipple 1.

The fastening member 30 is formed of a metal material such as stainless steel or another rigid material that is not prone to rust, for example, into a substantially cylindrical shape having an inner diameter larger than the outer diameter of the later-described sleeve 4 in a part in the axial direction, and is disposed on the nipple 1 side so as to be capable of reciprocating in the pipe insertion direction N and the pipe removal direction U via a sliding mechanism 31.

The slide mechanism 31 is formed over the fastening member 30 and the nipple 1 or the cylindrical member 20, and supports the fastening member 30 relative to the nipple 1 so as to be capable of reciprocating in the pipe insertion direction N and the pipe removal direction U.

The 2 nd inclined surface 3 opposed to the 1 st inclined surface 2 in the direction U opposite to the pipe insertion direction N (hereinafter referred to as "pipe removal direction U") and having an inner diameter gradually decreasing in the pipe removal direction U is formed on the inner peripheral surface of the fastening member 30 so as to be opposed to the outer peripheral surface 1a of the threaded pipe 1, or the 2 nd inclined surface 3 is integrally formed on the inner peripheral surface of another member fitted to the inner peripheral surface of the fastening member 30.

Preferably, the inclination angle of the 2 nd inclined surface 3 is substantially the same as the inclination angle of the 1 st inclined surface 2 so that the 2 nd inclined surface 3 and the 1 st inclined surface 2 formed on the inner peripheral surface of the tubular member 20 are in plane symmetry in the pipe insertion direction N, and the 2 nd inclined surface 3 and the 1 st inclined surface 2 are opposed to each other so as to form a splayed cross section, and as another example, the inclination angle of the 1 st inclined surface 2 may be set smaller than the inclination angle of the 2 nd inclined surface 3 so as to be substantially parallel to the outer peripheral surface 1a of the nipple 1.

Further, as shown in the drawing, for example, it is preferable that a plurality of flat surface portions for engaging with a tool or the like or concave-convex portions such as knurls are formed in the circumferential direction at appropriate intervals on the outer circumferential surface of the fastening member 30 as the tool engaging portion 32 for rotation operation.

The sleeve 4 is formed of an elastically deformable material such as polyoxymethylene resin or synthetic resin having excellent surface smoothness and heat resistance, for example, and is formed in a substantially cylindrical shape, and is disposed so as to face the outer peripheral surface 1a of the nipple 1 in the radial direction through the insertion space S of the pipe body B, and so as to be sandwiched between the 1 st inclined surface 2 and the 2 nd inclined surface 3 and to be capable of reciprocating in the pipe insertion direction N and the pipe removal direction U.

The sleeve 4 has an elastic deformation portion 4a that elastically expands and contracts in the radial direction, and the inner diameter thereof is set to be substantially the same as or larger than the outer diameter of the pipe body B described later when expanded and to be smaller than the outer diameter of the pipe body B when contracted.

The sleeve 4 has, on its outer circumferential surface: a1 st tapered surface 4b facing substantially parallel to the 1 st inclined surface 2 and having a diameter gradually decreasing in the tube insertion direction N; and a 2 nd tapered surface 4c facing the 2 nd inclined surface 3 substantially in parallel and having a diameter gradually decreasing in the tube falling direction U.

Preferably, the length and the inclination angle of the tube insertion direction N in the 1 st tapered surface 4b are the same as those of the tube removal direction U in the 2 nd tapered surface 4c with respect to the 1 st tapered surface 4b and the 2 nd tapered surface 4c, whereby the entire sleeve 4 is symmetrical in the tube insertion direction N and the tube removal direction U. In another example, the inclination angle of the 1 st tapered surface 4b may be set smaller than the inclination angle of the 2 nd tapered surface 4c, so that the entire sleeve 4 is asymmetrical in the tube inserting direction N and the tube dropping direction U.

A specific example of the elastic deformation portion 4a is configured as follows: by forming the notch portion 4a1 such as a groove, a slit, or a dimple in part of the sleeve 4 in the axial direction, the sleeve is elastically deformed in the radial direction to expand and contract smoothly and to reduce the diameter, and in a state where the tapered surface 4b is brought into contact with the 1 st inclined surface 2 and the reverse tapered surface 4c is brought into contact with the 2 nd inclined surface 3, the tapered surface 4b and the reverse tapered surface 4c slide along the 1 st inclined surface 2 and the 2 nd inclined surface 3 by the relative movement of the 1 st inclined surface 2 and the 2 nd inclined surface 3, respectively, and the sleeve 4 is deformed in the diameter reduction as a whole.

In the illustrated example, the plurality of grooves (slits) extending linearly in the axial direction from both axial end portions of the sleeve 4 are formed by cutting out in a staggered manner in the circumferential direction, whereby the overall axial length of the sleeve 4 can be smoothly expanded and reduced in diameter.

As another example, although not shown, a plurality of grooves extending in the axial direction from one end portion of the sleeve 4 in the axial direction may be formed in the circumferential direction, 1 groove may be formed in the axial direction of the sleeve 4, or a groove extending in a non-linear manner such as a curved line may be formed.

The inner peripheral surface of the sleeve 4 is provided with: a protrusion 4d that protrudes in a circumferential annular or nearly annular manner toward the outer circumferential surface 1a of the nipple 1 and the insertion space S of the pipe body B; and an annular seal member 6 having an inner peripheral end 6a projecting further toward the outer peripheral surface 1a of the nipple 1 and the insertion space S of the pipe body B than the tip of the projection 4 d. Preferably, the projection 4d and the seal member 6 are caused to sink into the outer surface B2 of the pipe body B by the diameter-reducing deformation of the sleeve 4.

Specifically, the 1 st inclined surface 2 of the tubular member 20 and the 2 nd inclined surface 3 of the fastening member 30 are moved relatively closer to each other, so that the sleeve 4 is deformed in a reduced diameter manner, and the projection 4d and the seal member 6 are respectively pressed into and recessed in the outer surface B2 of the pipe body B.

Preferably, the plurality of projections 4d are formed to project at intervals in the tube inserting direction N and the tube removing direction U. At this time, as the sleeve 4 is deformed by reducing the diameter, the plurality of projections 4d are locally pressed against the outer surface B2 of the tube B and are compressed and deformed, and the expanded and deformed portion of the outer surface B2 of the tube B is sandwiched between the projections 4d, so that even if a creep (permanent deformation) phenomenon occurs in the tube B, the pressed portion with the sleeve 4 is held, and high sealability can be maintained.

As shown in fig. 2 (a), the sealing member 6 is formed in an annular shape from a material that can be compressed and deformed, such as rubber, and is positioned so that the inner peripheral end 6a of the sealing member 6 projects toward the outer surface B2 of the pipe body B by fitting or the like the outer peripheral portion thereof into the attachment recess 4e formed in the inner peripheral surface of the sleeve 4 so as to be immovable. Further, it is preferable that the inner peripheral surface of the seal member 6 is formed to be curved to have a substantially arc-shaped cross section, and a recessed groove portion 6b into which a portion that expands and deforms when the seal member 6 is compressed and deformed is formed on the surface thereof.

In the illustrated example, a plurality of protrusions 4d are provided on the inner peripheral surface of the sleeve 4 so as to protrude in the axial direction thereof, an annular mounting recess 4e is formed at an intermediate position in the axial direction thereof, and an elastically deformable seal member 6 such as an O-ring is fitted into the annular mounting recess 4e so as to be held immovable in the axial direction.

In another example, although not shown, instead of providing either or both of the projection 4d and the seal member 6 on the inner circumferential surface of the sleeve 4, a part or all of the inner circumferential surface of the sleeve 4 in the axial direction may be smoothly formed.

The annular recessed portion 5 is provided on the back side of the sleeve 4 in the tube insertion direction N so as to face the insertion space S of the tube body B in the radial direction via the stepped portion 5a and communicate with each other. Specifically, a stepped portion 5a is continuously provided at the rear end of the sleeve 4 in the tube insertion direction N, an annular recessed portion 5 is formed between the first inclined surface 2 arranged on the rear side of the sleeve 4 in the tube insertion direction N, or the stepped portion 5a and the annular recessed portion 5 are continuously formed in the tube insertion direction N at the rear end of the first inclined surface 2 in the tube insertion direction N.

The annular recessed portion 5 is formed so as to radially face a portion on the inner side in the tube insertion direction N than a facing position with respect to the sleeve 4 across an insertion space S of the pipe body B in the outer peripheral surface 1a of the nipple 1, and so as to communicate with the insertion space S of the pipe body B via a stepped portion 5 a. The annular recess 5 is formed so that the diameter thereof is the maximum inner diameter of the inner peripheral surface or larger than the minimum inner diameter of the 1 st inclined surface 2 when the diameter of the sleeve 4 is reduced, and the inner side surface in the tube falling direction U is formed as a stepped portion 5a so as to be continuous with the inner bottom surface of the annular recess 5 in a substantially right angle shape.

The annular recess 5 is configured such that, as the sleeve 4 is deformed to be reduced in diameter by the relative movement of the 1 st inclined surface 2 of the tubular member 20 and the 2 nd inclined surface 3 of the tightening member 30, a tip end outer peripheral portion B3 at the connection end Ba of the tube B, which will be described later, is fitted into the annular recess 5 to be deformed to expand in an annular shape.

On the other hand, the pipe body B is preferably a hose, a pipe or the like molded from a soft synthetic resin such as vinyl chloride, a soft material such as silicone rubber or other rubber, and has an inner surface B1 and an outer surface B2 which are flat.

As a specific example of the pipe body B, a hose having a single-layer structure is used in the illustrated example.

As another example of the tube body B, although not shown, a plurality of tube bodies having different structures, that is, a laminated hose (braided hose) in which a plurality of or a single synthetic resin braid (reinforcing yarn) are spirally embedded as an intermediate layer between a transparent or opaque outer layer and an inner layer, a spiral reinforced hose (Fohlen hose) in which a band-shaped reinforcing member such as a rectangular cross section made of synthetic resin or metal and a linear reinforcing member such as a circular cross section are spirally wound as an intermediate layer and integrated, a spiral reinforced hose in which a metal wire or a hard synthetic resin wire is spirally embedded, or the like can be used.

According to the pipe connector a according to the embodiment of the present invention, as shown in fig. 1 (a), the connection end portion Ba of the pipe body B is inserted toward the insertion space S of the pipe body B formed along the outer peripheral surface 1a of the tube 1, and the tip end portion B4 of the connection end portion Ba reaches the back side in the pipe insertion direction N from the 1 st inclined surface 2, and in this state, as shown in fig. 1 (B), for example, when the fastening member 30 is moved in the pipe insertion direction N by the sliding mechanism 31 or the like to move the 1 st inclined surface 2 and the 2 nd inclined surface 3 relatively closer to each other, the tapered surface 4B and the reverse tapered surface 4c of the sleeve 4 slide along these surfaces, and accordingly, the entire sleeve 4 is gradually reduced in diameter and deformed.

Accordingly, the inner peripheral surface of the sleeve 4 is pressed against the outer surface B2 of the pipe body B, the outer surface B2 of the pipe body B is partially compressed and deformed so that the inner peripheral surface of the sleeve 4 is recessed into the outer surface B2 of the pipe body B, and at the same time, the distal end outer peripheral portion B3 of the compression deformation is engaged with the step portion 5a from the distal end outer peripheral portion B3 of the pipe body B by bulging deformation toward the annular recessed portion 5, and the entire pipe body B is held so as not to move in the pipe dropping direction U.

Therefore, even if the creep phenomenon occurs in the pipe body B due to the change with time and the thickness dimension of the pressure-contact portion with the sleeve 4 becomes thin, the bulging-deformed distal end outer peripheral portion B3 of the pipe body B continues to be caught by the step portion 5a, and the drop strength of the pipe body B can be maintained high.

In particular, when the annular seal member 6 is provided so that the inner peripheral end 6a of the sleeve 4 projects toward the insertion space S of the pipe body B, the sleeve 4 is deformed so as to be reduced in diameter in accordance with the relative movement of the 1 st inclined surface 2 and the 2 nd inclined surface 3, and the inner peripheral end 6a of the seal member 6 projecting from the inner peripheral surface of the sleeve 4 is thereby stuck to the outer surface B2 of the pipe body B.

Therefore, even if a creep phenomenon occurs in the pipe body B and the thickness of the portion to be pressure-bonded to the sleeve 4 becomes small, the sealing performance can be maintained high.

As a result, as compared with a conventional pipe connector in which the wedge ring is deformed by moving the opposing inclined surfaces closer to each other to reduce the diameter thereof, and the inner circumferential surface of the wedge ring is pressed against the outer circumferential surface of the connection pipe, even if a creep phenomenon occurs in the pipe body B, the seal can be maintained for a long period of time, thereby further improving safety.

Further, compared to a pipe connector in which an annular seal member is embedded in the outer circumferential surface 1a of the nipple 1 facing the inner surface B1 of the pipe body B, the wall thickness of the nipple 1 can be made thin, so that the flow rate through the nipple 1 is not reduced, and a large step is not generated between the nipple 1 and the inner surface B1 of the pipe body B, and contamination (contamination) due to accumulation of dross or the like can be prevented, and sanitation can be maintained for a long period of time.

When a plurality of projections 4d projecting toward the insertion space S of the pipe body B are arranged at predetermined intervals in the insertion direction (pipe insertion direction) N of the pipe body B on the inner peripheral surface of the sleeve 4, the sleeve 4 is entirely deformed so as to be reduced in diameter by the relative approaching movement of the 1 st inclined surface 2 and the 2 nd inclined surface 3, a portion B2a sandwiched between the projections 4d is expanded and deformed on the outer surface B2 of the pipe body B, and the expanded and deformed portion B2a is sandwiched between the projections 4d, so that the pipe body B is not moved in the pipe removal direction U, and the pressure contact portion with the sleeve 4 is held even if a creep (permanent deformation) phenomenon occurs in the pipe body B.

Thus, even if a creep phenomenon occurs in the pipe body B, the drop-out strength and the sealing property can be maintained at a high level.

As a result, even if a creep phenomenon occurs in the pipe body B, the pipe body B can be prevented from dropping off for a long period of time, and high sealing performance can be maintained, thereby further improving safety.

Further, when the 1 st tapered surface 4B facing the 1 st inclined surface 2 and the 2 nd tapered surface 4c facing the 2 nd inclined surface 3 are formed on the outer peripheral surface of the sleeve 4 so as to be symmetrical in the insertion direction (tube insertion direction) N and the reverse direction (tube removal direction) U of the tube body B, respectively, even if the sleeve 4 is disposed between the 1 st inclined surface 2 of the tubular member 20 and the 2 nd inclined surface 3 of the fastening member 30 so that the 1 st tapered surface 4B and the 2 nd tapered surface 4c are in either of the front and reverse directions, the sleeve is deformed to be reduced in diameter similarly by the relative approaching movement of the 1 st inclined surface 2 and the 2 nd inclined surface 3.

This enables the sleeve 4 to be assembled in either the front or rear direction.

As a result, the assembling of the sleeve 4 becomes easy, and assembling errors can be reduced.

Next, embodiments of the present invention will be described with reference to the drawings.

Example 1

As shown in fig. 1 (a), (b) and fig. 2, in example 1, an annular recess 5 is formed at the rear end of the ferrule 4 in the tube insertion direction N via a step portion 5 a.

Specifically, the following structure is provided: that is, in the sleeve 4, the back end surface in the pipe insertion direction N is formed as a stepped portion 5a, the annular recessed portion 5 is formed over the cylindrical member 20 having the 1 st inclined surface 2 adjacent to the stepped portion, and the inner peripheral surface thereof is caused to sink into the outer surface B2 of the pipe body B by the reduction deformation of the sleeve 4, whereby the outer surface B2 of the pipe body B which has been compressed and deformed expands along the stepped portion 5a which becomes the back end surface of the sleeve 4 to a diameter larger than the maximum inner diameter of the inner peripheral surface of the sleeve 4 at the time of reduction.

In example 1, screw portions that are screwed together are used as the sliding mechanism 31 that moves the fastening member 30 in the axial direction with respect to the threaded pipe 1.

In the example shown in fig. 1 (a), (b) and fig. 2, the fastening member 30 forming the 2 nd inclined surface 3 is a nut having a female screw engraved as the sliding mechanism 31, and is attached to the nipple 1 side so as to be reciprocatingly movable in the axial direction thereof by screwing the female screw to the male screw 21 engraved on the outer peripheral surface of the cylindrical member 20. By rotating the tightening member 30 to move the 2 nd inclined surface 3 closer to the 1 st inclined surface 2 of the tubular member 20, the 1 st tapered surface 4b and the 2 nd tapered surface 4c of the sleeve 4 are deformed to be reduced in diameter substantially uniformly.

However, when metal screw portions that are screwed together are used as the slide mechanism 31, if the two screw portions are screwed together with tightening, heat is generated by friction at the screwed portions, and the two screw portions expand due to the frictional heat, so that there is a possibility that so-called "seizing (burning)" occurs, which becomes immovable due to adhesion. In order to prevent this, it is preferable that either the female screw portion or the male screw portion is made of a non-metal or the like, so as to avoid frictional heat generation at the screw-threaded portion at the time of fastening.

In the illustrated example, the cylindrical member 20 forming the 1 st inclined surface 2 is integrally formed as a double cylinder facing radially with the insertion space S of the pipe body B interposed therebetween outside the nipple 1.

In the example shown in fig. 1 (a) and (B), a convex portion slightly protruding from the outer peripheral surface 1a of the nipple 1 is formed as the contact portion 1c facing the distal end surface B4 of the pipe body B, and a space allowing the distal end surface B4 of the pipe body B to be deformed by expansion is formed outside the convex portion.

In another example, although not shown, the abutting portion 1c may be formed to protrude perpendicularly from the outer peripheral surface 1a of the nipple 1 and abut the entire distal end surface B4 by inserting the pipe body B.

In example 1, the fitting recess 4e for fitting the seal member 6 is integrally formed in the center of the inner peripheral surface of the sleeve 4 in the pipe inserting direction N and the pipe removing direction U, and a plurality of (2) projections 4d are integrally formed on the pipe inserting direction N side and the pipe removing direction U side with the fitting recess 4e interposed therebetween, whereby the entire sleeve 4 is formed in a symmetrical shape in the pipe inserting direction N and the pipe removing direction U.

Further, the nipple 1 is formed with a connector body 10 on the back side in the pipe insertion direction N.

In example 1, as the connector body 10, a screw portion 10a for connecting the pipe connector a to a pipe connection port (not shown) of another device and a tool engagement portion 10b for engaging a tool (not shown) such as a wrench or spanner are integrally formed with the nipple 1, and the screw portion 10a is screwed to a screw portion (not shown) formed in another pipe, whereby the connector body is detachably connected to another device.

When a female screw is formed on the inner peripheral surface of a pipe connection port in another device (not shown) connected to the pipe connector a, a male screw corresponding to the female screw is formed on the screw portion 10 a. When a male screw is cut on the outer peripheral surface of the pipe connection port in another machine, a female screw corresponding to the male screw is cut. In the illustrated example, a male screw is engraved as the screw portion 10 a.

As the tool engagement portion 10b, a cap nut having a larger diameter than a cap nut partially formed as the tool engagement portion 32 for rotation operation is formed at one end in the axial direction of the outer peripheral surface of the fastening member 30.

In another example, although not shown, the threaded portion 10a and the tool engagement portion 10b may be formed separately from the nipple 1 as the connector body 10 and detachably attached to the nipple 1.

According to the pipe connector a according to the embodiment 1 of the present invention, as shown in fig. 1 (a), (B) and fig. 2, when the tightening member 30 is tightened and moved in the pipe insertion direction N by the screw threads serving as the sliding mechanism 31 and the 2 nd inclined surface 3 is moved closer to the 1 st inclined surface 2, and the sleeve 4 is deformed to reduce the diameter, the inner peripheral surface of the sleeve 4 (the projection 4d or the seal member 6) is pressed against the outer surface B2 of the pipe body B, and the outer surface B2 of the pipe body B is partially deformed to be compressed and sunk, and at the same time, the diameter larger than the maximum inner diameter of the inner peripheral surface when the sleeve 4 is deformed to reduce the diameter is expanded and deformed along the stepped portion 5a toward the annular recessed portion 5 by an amount corresponding to the capacity of the compression deformation.

Thus, the bulging and deformed distal end outer peripheral portion B3 of the pipe body B is caught by the step portion 5a in the pipe dropping direction U, and the entire pipe body B is held so as not to move in the pipe dropping direction U.

This has the advantage that the drop-out strength can be maintained at a high level in accordance with the creep phenomenon of the pipe body B with a simple structure.

Further, as shown in the example, when a convex portion slightly protruding from the outer peripheral surface 1a of the nipple 1 is formed as the contact portion 1c facing the distal end surface B4 of the pipe body B, when the inner peripheral surface of the sleeve 4 is recessed into the outer surface B2 of the pipe body B along with the diameter reduction deformation of the sleeve 4, the distal end surface B4 of the pipe body B is expanded and deformed further to the back side in the pipe insertion direction N than the convex portion which becomes the contact portion 1c, and therefore, the inner peripheral surface of the sleeve 4 can be further fastened to the outer surface B2 of the pipe body B, and can be recessed more deeply.

Example 2

As shown in fig. 3 (a) and (b), in example 2, the cylindrical member 20 is different from example 1 shown in fig. 1 (a) and (b) and fig. 2 in that an annular recessed portion 5 is formed at the inner end of the 1 st inclined surface 2 in the pipe insertion direction N via a stepped portion 5a, and the configuration is the same as that of example 1 shown in fig. 1 (a) and (b) and fig. 2 except for this.

Specifically, the stepped portion 5a and the annular recessed portion 5 are formed in the tubular member 20 so as to be continuous with the back end of the 1 st inclined surface 2, and the inner peripheral surface thereof is brought into pressure contact with the outer surface B2 of the pipe body B in accordance with the reduction deformation of the sleeve 4, whereby the outer surface B2 of the pipe body B which has been compressed and deformed expands and deforms to a diameter larger than the minimum inner diameter of the 1 st inclined surface 2 along the stepped portion 5a which becomes the back end of the 1 st inclined surface 2.

In the example shown in fig. 3 (a) and (B), a cylindrical member 22 formed separately from the cylindrical member 20 integrally formed on the outside of the threaded connector 1 is fitted into the cylindrical member so as not to move in the pipe insertion direction N, and the 1 st inclined surface 2 formed on the inner peripheral surface of the cylindrical member 22 is arranged to radially face the outer peripheral surface 1a of the threaded connector 1 with the insertion space S of the pipe body B interposed therebetween.

According to the pipe connector a according to the embodiment 2 of the present invention, as shown in fig. 3 (a) and (B), in the example shown in fig. 3, when the tightening member 30 is tightened and moved in the pipe insertion direction N by the screw threads serving as the sliding mechanism 31, and the 2 nd inclined surface 3 is moved closer to the 1 st inclined surface 2, and the sleeve 4 is deformed to reduce the diameter, the inner peripheral surface of the sleeve 4 (the projection 4d or the seal member 6) is pressed against and stuck into the outer surface B2 of the pipe body B, and the outer surface B2 of the pipe body B is partially compressed and deformed, and at the same time, the diameter larger than the minimum inner diameter of the 1 st inclined surface 2 is expanded and deformed toward the annular concave portion 5 along the stepped portion 5a by the volume of the compression deformation.

Thus, the bulging and deformed distal end outer peripheral portion B3 of the pipe body B is caught by the step portion 5a in the pipe dropping direction U, and the entire pipe body B is held so as not to move in the pipe dropping direction U.

As a result, compared to example 1 shown in fig. 1 (a), (B) and fig. 2, there is an advantage that the amount of bulging deformation at the distal end outer peripheral portion B3 of the pipe body B fitted into the annular recess 5 can be secured constant regardless of the amount of sinking of the inner peripheral surface (the projection 4d or the seal member 6) of the sleeve 4 into the outer surface B2 of the pipe body B, and the drop-out strength can be maintained high due to the creep phenomenon of the pipe body B.

Example 3

As shown in fig. 4 (a) and (B), in embodiment 3, a stopper 2a is provided on the 1 st inclined surface 2, and the stopper comes into contact with the back end 4f of the sleeve 4 in the insertion direction (tube insertion direction) N of the tube body B as the 1 st inclined surface 2 and the 2 nd inclined surface 3 move relatively closer to each other, and the stopper 2a of the 1 st inclined surface 2 comes into contact with the back end 4f of the sleeve 4 as the 1 st inclined surface 2 and the 2 nd inclined surface 3 move relatively closer to each other by the fastening member 30, and the 2 nd tapered surface 4c facing the 2 nd inclined surface 3 in the sleeve 4 is deformed to be reduced in diameter to the maximum extent, which is different from embodiment 1 shown in fig. 1 (a) and (B) and fig. 2 or embodiment 2 shown in fig. 3 (a) and (B), and the other configurations are different from embodiment 1 shown in fig. 1 (a) and (B) shown in fig. 2 or embodiment 3 (a) shown in fig. 1 (a) and (B), (b) The embodiment 2 shown is the same.

To describe in detail, the stopper 2a facing the back end 4f of the ferrule 4 in the tube insertion direction N is formed in a concave shape in the vicinity of the back end of the 1 st inclined surface 2 in the tube insertion direction N, and as the 1 st inclined surface 2 and the 2 nd inclined surface 3 are moved relatively closer by operating the tightening member 30, first, the ferrule 4 is moved in the tube insertion direction N while being deformed in a reduced diameter manner, and the back end 4f in the tube insertion direction N comes into contact with the stopper 2 a. Thereafter, in a state where the stopper 2a is in contact with the back end 4f of the sleeve 4 in the tube insertion direction N, the 2 nd inclined surface 3 is moved closer to the 1 st inclined surface 2 of the tubular member 20 by further operating the fastening member 30, whereby the 2 nd tapered surface 4c of the sleeve 4 is largely deformed to be reduced in diameter at the 2 nd inclined surface 3.

In the example shown in fig. 4 (a) and (b), the sleeve 4 is formed so that the 1 st tapered surface 4b and the 2 nd tapered surface 4c are symmetrical in the tube inserting direction N and the tube removing direction U. By moving the 2 nd inclined surface 3 toward the 1 st inclined surface 2 by rotating the tightening member 30, as shown in fig. 4 (b), the sleeve 4 first moves in the tube insertion direction N while deforming in a diameter-reduced manner, and the inner end 4f in the tube insertion direction N comes into contact with the stopper 2 a.

Thereafter, when the 2 nd inclined surface 3 is moved closer to the 1 st inclined surface 2 by further rotating the fastening member 30, not only the 2 nd tapered surface 4c but also substantially the entire outer peripheral surface of the elastically deformable portion 4a other than the 1 st tapered surface 4b of the sleeve 4 is pressed along the 2 nd inclined surface 3 to be inclined linearly by the 2 nd inclined surface 3. That is, in the sleeve 4, the 2 nd inclined surface 3 is deformed so as to be reduced in diameter more than the 1 st tapered surface 4b, and the inner peripheral portion of the 2 nd tapered surface 4c and the annular seal member 6 are deformed so as to be reduced in diameter to the maximum extent.

Thereby, the inner peripheral portion of the 2 nd tapered surface 4c is pressed against the outer surface B2 of the tube B to be maximally recessed, and the outer surface B2 of the tube B is locally fastened by being concentrated on the inner peripheral portion of the 2 nd tapered surface 4c or the portion of the annular seal member 6 in contact therewith.

As another example, although not shown, the socket 4 may be formed such that the inclination angle of the 1 st inclined surface 2 is smaller than the inclination angle of the 2 nd inclined surface 3 so as to be substantially parallel to the outer peripheral surface 1a of the nipple 1, and the inclination angle of the 1 st tapered surface 4b is smaller than the inclination angle of the 2 nd tapered surface 4c and so as to be asymmetrical in the pipe inserting direction N and the pipe dropping direction U.

In the example shown in fig. 4 (a) and (B), the cylindrical member 20 is provided with the see-through window 2B at a position radially opposed to the abutment portion 1c formed on the outer peripheral surface 1a of the nipple 1 so that the presence or absence of the abutment portion 1c formed on the outer peripheral surface 1a of the nipple 1 can be visually confirmed to reliably abut against the distal end surface B4 of the pipe body B.

As shown in fig. 4b, the transparent window 2b is covered with the fastening member 30 and is not exposed in a state where the sliding mechanism (female screw portion) 31 of the fastening member 30 is screwed and fastened to the male screw portion 21 of the tubular member 20.

In the example shown in fig. 4 (a) and (b), the threaded joint 1 has the retaining concave-convex portion 1b disposed at the inner peripheral portion of the 2 nd tapered surface 4c and at a position facing the annular seal member 6.

According to the pipe connector a according to embodiment 3 of the present invention, as the 1 st inclined surface 2 and the 2 nd inclined surface 3 are moved relatively closer to each other by the fastening member 30, the back end 4f of the socket 4 in the pipe insertion direction N is brought into contact with the stopper 2a, thereby preventing the over-movement of the socket 4, and as the 2 nd inclined surface 3 moves closer to the 1 st inclined surface 2 thereafter, the 2 nd tapered surface 4c of the socket 4 facing the 2 nd inclined surface 3 is deformed to be reduced in diameter to the maximum extent, and the inner peripheral portion of the 2 nd tapered surface 4c is pressed against the outer surface B2 of the pipe body B to be recessed to the maximum extent.

This can reduce the fastening area of the sleeve 4 by the fastening member 30.

As a result, as shown in fig. 1 (a), (B) and fig. 2 or fig. 3 (a), (B), as the 1 st inclined surface 2 and the 2 nd inclined surface 3 move relatively closer to each other by the tightening member 30, the 1 st tapered surface 4B and the 2 nd tapered surface 4c of the sleeve 4 are respectively deformed so as to be reduced in diameter substantially uniformly, and compared to this, the tightening torque of the sleeve 4 by the tightening member 30 can be reduced for a plurality of types of pipe bodies B having different structures.

This provides an advantage that the pipe connection can be easily performed even if the structure of the pipe body B is changed, and the sealing property is excellent.

Further, as in the example shown in fig. 4 (a) and (b), in the threaded pipe 1, when the retaining concave-convex portion 1b is disposed at the inner peripheral portion of the 2 nd tapered surface 4c and at a position facing the annular seal member 6, there are advantages such as excellent sealing effect and retaining effect.

Example 4

As shown in fig. 5 (a), (B) and fig. 6, in example 4, a surface pressing portion 4g which is smooth and does not protrude beyond the protruding portion 4d is provided along the insertion space S of the pipe body B on the inner peripheral surface of the socket 4, and the surface pressing portion 4g is arranged so as to face the opening end portion 1d of the nipple 1 when the socket 4 is deformed in a reduced diameter, which is different from example 1 shown in fig. 1 (a), (B) and fig. 2 or example 2 shown in fig. 3 (a), (B) or example 3 shown in fig. 4 (a), (B), and the configuration other than this is the same as example 1 shown in fig. 1 (a), (B) and fig. 2 or example 2 shown in fig. 3 (a), (B) or example 3 shown in fig. 4 (a), (B).

In the example shown in fig. 5 (a), (b) and 6, the fitting recess 4e for fitting the seal member 6 is integrally formed in the center of the pipe insertion direction N and the pipe removal direction U in the inner peripheral surface of the sleeve 4, 1 projection 4d is disposed on each of the pipe insertion direction N side and the pipe removal direction U side with the fitting recess 4e interposed therebetween, and the smooth portions 2g are integrally formed at both end portions, whereby the entire sleeve 4 has a symmetrical shape in the pipe insertion direction N and the pipe removal direction U.

In the example shown in fig. 6, a plurality of concave portions 4h are formed in the tapered surface 4b and the reverse tapered surface 4c of the sleeve 4 in a concave shape in the circumferential direction so as to reduce the contact area with the 1 st inclined surface 2 of the tubular member 20 and the 2 nd inclined surface 3 of the fastening member 30, whereby the sleeve 4 as a whole is smoothly deformed to be reduced in diameter as the 1 st inclined surface 2 and the 2 nd inclined surface 3 move closer to each other.

In another example, although not shown, the concave portion 4h may not be formed in the tapered surface 4b and the reverse tapered surface 4c of the sleeve 4, but may be formed to have a smooth circumferential surface as in embodiment 1, embodiment 2, and embodiment 3.

In example 4, a flange portion 10c is integrally formed on the back side of the nipple 1 in the pipe insertion direction N as the connector body 10.

The flange 10c is joined to a flange (not shown) having the same shape formed in another device (not shown) connected to the pipe connector a, and an annular coupling member (not shown) is attached to the flange, thereby detachably connecting the flange to another device.

In the illustrated example, an annular groove 10d into which an annular seal member (not shown) such as an O-ring is fitted is recessed in a connection end surface of the flange portion 10 c.

As another example, although not shown, the connector body 10 may be configured such that a flange portion 10c is formed separately from the nipple 1 and detachably attached to the nipple 1.

According to the pipe connector a according to embodiment 4 of the present invention, as the whole of the sleeve 4 is reduced in diameter and deformed by the relative movement of the 1 st inclined surface 2 and the 2 nd inclined surface 3, the smooth surface pressing portion 4g faces the opening end portion 1d of the nipple 1 and comes into surface contact with the outer surface B2 of the pipe body B, and therefore, even if the protrusion 4d is disposed in the vicinity of the opening end portion 1d of the nipple 1, the inner surface B1 of the pipe body B is not deformed so as to bulge inward of the inner peripheral surface 1e of the nipple 1.

As a result, the fluid passing through the pipe body B and the interior of the nipple 1 can pass through without hindrance.

As a result, there is an advantage that pressure loss due to a decrease in the fluid passing through the pipe body B and the nipple 1 can be prevented.

In example 1, example 2, and example 3, the threaded portion 10a and the tool engagement portion 10b are formed on the back side of the threaded pipe 1 in the pipe insertion direction N as the connector body 10, but the present invention is not limited to this, and the flange portion 10c may be formed as the connector body 10 instead of the threaded portion 10a and the tool engagement portion 10b as in example 4.

In contrast, in example 4, the flange portion 10c is formed on the back side of the nipple 1 in the pipe insertion direction N as the connector body 10, but the present invention is not limited to this, and the threaded portion 10a and the tool engagement portion 10b may be formed instead of the flange portion 10c as in example 1 and the like.

In the illustrated example, the female screw portion and the male screw portion 21 that are screwed together are formed as the sliding mechanism 31 that moves the fastening member 30 in the axial direction with respect to the threaded pipe 1, but the present invention is not limited thereto, and a configuration other than a screw may be used as long as at least the fastening member 30 can be moved in the axial direction with respect to the sleeve 4.

Further, the description has been made of a case where a single-layer hose is used as the pipe body B and other laminated hoses, spiral reinforced hoses, and the like are used instead, but the present invention is not limited thereto, and a pipe or the like may be used instead of the hose.

Description of the symbols

1-nipple, 1 a-peripheral face, 1 d-open end, 20-cylindrical part, 2-1 st inclined face, 2 a-stopper, 30-fastening part, 3-2 nd inclined face, 4-sleeve, 4B-1 st conical face, 4 c-2 nd conical face, 4 d-protrusion, 4 f-inner side end of sleeve, 4 g-face pressing part, 5-annular recess, 5 a-step part, 6-sealing part, 6 a-inner peripheral end, B-tube body, B1-inner face, B3-front end peripheral part, S-tube body insertion space, N-tube body insertion direction (tube insertion direction), and the reverse direction of U-tube body insertion direction (tube falling direction).

Claims (6)

1. A pipe connector is provided with:

a nipple provided along an insertion space of the flexible pipe body;

a cylindrical member provided so as to radially face an outer peripheral surface of the threaded nipple with the insertion space of the pipe body interposed therebetween, and having a1 st inclined surface formed so that an inner diameter thereof gradually decreases in an insertion direction of the pipe body;

a tightening member provided so as to face the outer peripheral surface of the threaded nipple in a radial direction with the insertion space of the pipe body interposed therebetween, so as to face the 1 st inclined surface in the insertion direction of the pipe body, so as to be movable back and forth in the insertion direction of the pipe body with respect to the 1 st inclined surface, and having a 2 nd inclined surface formed so that an inner diameter thereof gradually decreases in a direction opposite to the insertion direction of the pipe body; and

a sleeve that is provided so as to radially face the outer peripheral surface of the threaded connector with the insertion space of the pipe body interposed therebetween, that is capable of reciprocating in the insertion direction of the pipe body between the 1 st inclined surface and the 2 nd inclined surface and that is capable of elastic deformation in the radial direction, and that is formed so as to be deformed so as to be reduced in diameter as the 1 st inclined surface and the 2 nd inclined surface move closer to each other,

an annular recessed portion is provided on a back side of the sleeve in the insertion direction of the pipe body so as to face the insertion space of the pipe body in a radial direction via a stepped portion and communicate with each other,

the annular recess is formed to have a diameter larger than an inner diameter of the sleeve when the sleeve is reduced in diameter, and the outer peripheral portion of the distal end of the pipe body is expanded and deformed into an annular shape in accordance with the reduction deformation of the sleeve, and is fitted into the annular recess.

2. The pipe connector of claim 1,

an annular seal member is provided on an inner peripheral surface of the sleeve such that an inner peripheral end thereof protrudes toward the insertion space of the pipe body.

3. The pipe connector according to claim 1 or 2,

a plurality of protrusions protruding toward the insertion space of the tube body are arranged at predetermined intervals in the insertion direction of the tube body on the inner peripheral surface of the sleeve.

4. The pipe connector according to claim 1, 2 or 3,

a1 st tapered surface facing the 1 st inclined surface and a 2 nd tapered surface facing the 2 nd inclined surface are formed on the outer peripheral surface of the sleeve so as to be symmetrical in the insertion direction and the reverse direction of the pipe body, respectively.

5. The pipe connector according to claim 1, 2, 3 or 4,

a stopper is provided on the 1 st inclined surface, the stopper abutting against a rear end of the sleeve in the insertion direction of the pipe body as the 1 st inclined surface and the 2 nd inclined surface move closer to each other, and the stopper of the 1 st inclined surface abutting against the rear end of the sleeve and the 2 nd tapered surface opposing the 2 nd inclined surface in the sleeve are deformed so as to be reduced in diameter to the maximum extent as the 1 st inclined surface and the 2 nd inclined surface move closer to each other by the fastening member.

6. The pipe connector according to claim 1, 2, 3 or 4,

a surface pressing portion that is smooth and does not protrude beyond the protruding portion is provided along the insertion space of the pipe body on the inner peripheral surface of the sleeve, and the surface pressing portion is arranged so as to face the open end portion of the threaded connection pipe when the sleeve is deformed in a reduced diameter manner.