JP5557221B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint used for connecting a flexible deformable hose or tube such as a tube formed of a soft material such as synthetic resin or rubber.

  Conventionally, as this kind of pipe joint, a concave ring groove into which the end of the connecting pipe can be fitted is provided on one side, and the end surface of the outer wall of the concave ring groove is an inward inclined surface, while the inner wall side is extended. The inner cylinder, a joint main body provided with a number of locking grooves on the outer peripheral surface of the inner cylinder, a cap nut having an inner back surface opposite to the inclined surface of the joint main body, and both ends. An inclined surface corresponding to the inclined surface of the joint main body and the reverse inclined surface of the cap nut, and a wedge ring formed with a split groove inclined at a certain angle with respect to the axial direction, and the end of the connecting pipe is After being inserted into the concave ring groove, the cap nut is screwed and tightened to the threaded portion of the joint main body, and the wedge ring is pressed between the opposing inclined surface of the joint main body and the reverse inclined surface of the cap nut. By doing so, the wedge ring is internally contracted by the split groove, and a large number of teeth formed on the inner peripheral surface of the wedge ring are formed on the connection pipe. At the same time cuts into the peripheral surface, there is one inner peripheral surface of the connection tube to be squeezed has been so fitted into locking grooves of the inner tube (for example, see Patent Document 1).

Japanese Utility Model Publication No. 57-182691

In such a conventional pipe joint, the wedge ring is reduced in diameter by the close movement of the opposed inclined surfaces, and the inner peripheral surface of the wedge ring is pressed against the outer peripheral surface of the connecting pipe.
However, if the connecting pipe is a hose or tube made of synthetic resin, for example, and the creep (permanent strain) phenomenon occurs in the pressure contact portion with the wedge ring due to the change over time, the thickness of the pressure contact portion becomes thin. There was a problem that not only the body was easily removed but also the fluid was likely to leak from between them.
In order to solve such problems, an annular seal member that can be elastically deformed is provided on the outer peripheral surface of the inner cylinder facing the inner peripheral surface of the connection pipe so that the tip thereof bites into the inner peripheral surface of the connection pipe. Can be considered. However, in this case, the wall thickness of the inner cylinder is increased by the thickness of the seal member, which not only reduces the flow rate through the inner cylinder, but also occurs between the inner cylinder and the inner peripheral surface of the connecting pipe. There was a problem that soot and the like accumulated on the level difference and caused contamination.

An object of the present invention is to cope with such a problem, and an object of the present invention is to prevent a reduction in flow rate and pressure loss through the pipe body and the nipple .

In order to achieve such an object, the present invention provides a nipple provided along an insertion space of a flexible tubular body, and a radial direction across the outer peripheral surface of the nipple and the insertion space of the tubular body. A cylindrical member having a first inclined surface provided so as to be opposed and formed so that an inner diameter gradually decreases in an insertion direction of the tubular body, the outer peripheral surface of the nipple, and the tubular body Opposing in the radial direction across the insertion space, facing the first inclined surface and the insertion direction of the tube, and reciprocating in the insertion direction of the tube relative to the first inclined surface A tightening member having a second inclined surface formed so that an inner diameter gradually decreases in a direction opposite to the insertion direction of the tube body, the outer peripheral surface of the nipple, and the tube body Opposing in the radial direction across the insertion space, One of the first inclined surface and the second inclined surface is provided between the first inclined surface and the second inclined surface so as to be reciprocable in the insertion direction of the tube body and elastically deformable in the radial direction. A sleeve formed so as to be reduced in diameter with relative movement of the surface, and the first inclined surface of the cylindrical member is a relative of the first inclined surface and the second inclined surface. With a close approach movement, the sleeve has a concave stopper with which the inner end of the tube body in the insertion direction abuts, and the sleeve has a first tapered surface facing the first inclined surface; A second tapered surface opposed to the second inclined surface, and the back end of the sleeve is moved along with the relative movement of the first inclined surface and the second inclined surface by the fastening member; Abuts the stopper and inclines along the second inclined surface In other words, the second tapered surface is reduced in diameter than the first tapered surface, and a part of the tubular body is compressed and deformed between the inner peripheral portion of the second tapered surface and the outer peripheral surface of the nipple. Partially tightened, a projection projecting toward the insertion space of the tubular body on the inner peripheral surface of the sleeve, and a surface pressure that is smooth along the insertion space of the tubular body and does not project beyond the projection And the surface pressure portion is arranged so as to face the opening end of the nipple when the sleeve is reduced in diameter .

In the present invention having the above-described features, the entire surface of the sleeve due to relative movement of the first inclined surface and the second inclined surface is deformed, and the smooth surface pressure portion is opposed to the opening end of the nipple. By making surface contact with the outer surface of the tubular body, the inner surface of the tubular body does not bulge and deform inward from the inner peripheral surface of the nipple even if the protrusion is disposed near the opening end of the nipple.
Therefore, the fluid passing through the inside of the tube body and the nipple can pass smoothly without resistance.
As a result, it is possible to prevent a decrease in flow rate and pressure loss passing through the pipe body and the nipple.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal front view which shows the pipe joint which concerns on embodiment of this invention, (a) shows before the movement of a 1st inclined surface and a 2nd inclined surface, (b) is approach of a 1st inclined surface and a 2nd inclined surface. The part after the movement is shown partially enlarged. It is the perspective view, (a) has shown the whole decomposition | disassembly state, (b) is the perspective view which looked at the sleeve only from the reverse direction. It is a vertical front view which shows the pipe joint which concerns on the other Example of this invention, (a) shows before the movement of a 1st inclined surface and a 2nd inclined surface, (b) is a 1st inclined surface and a 2nd inclined surface. A partly enlarged view is shown. It is a vertical front view which shows the pipe joint which concerns on the other Example of this invention, (a) shows before the movement of a 1st inclined surface and a 2nd inclined surface, (b) is a 1st inclined surface and a 2nd inclined surface. A partly enlarged view is shown. It is a vertical front view which shows the pipe joint which concerns on the other Example of this invention, (a) shows before the movement of a 1st inclined surface and a 2nd inclined surface, (b) is a 1st inclined surface and a 2nd inclined surface. A partly enlarged view is shown. It is the perspective view, (a) has shown the whole decomposition | disassembly state, (b) is the perspective view which looked at the sleeve only from the reverse direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 6, a pipe joint A according to an embodiment of the present invention includes a nipple 1 provided along an insertion space S of a flexible tube B, and an outer peripheral surface 1 a of the nipple 1. A cylindrical member 20 provided so as to face the radial direction across the insertion space S of the tubular body B, the first circumferentially opposed surface 1a of the nipple 1 and the insertion space S of the tubular body B, and the first A clamping member 30 provided so as to be reciprocally movable in the axial direction of the nipple 1 relative to the inclined surface 2, and between the first inclined surface 2 and the second inclined surface 3 facing the outer peripheral surface 1 a of the nipple 1 in the radial direction. The sleeve 4 is provided as a main component so as to be reciprocally movable in the axial direction of the nipple 1 and elastically deformable in the radial direction.
The cylindrical member 20 has the 1st inclined surface 2 formed so that an internal diameter may become small gradually toward the axial direction of the nipple 1.
The fastening member 30 has a second inclined surface 3 formed so that the inner diameter gradually decreases in the opposite direction to the first inclined surface 2.

As shown in FIG. 1A, the outer peripheral surface of the nipple 1 with the first inclined surface 2 of the tubular member 20 and the second inclined surface 3 of the fastening member 30 separated in the axial direction of the nipple 1. A connection end Ba arranged at one end of the tube B is inserted toward the insertion space S of the tube B formed in a cylindrical shape along the line 1a.
Thereafter, as shown in FIG. 1B, the sleeve 4 is moved by moving the first inclined surface 2 of the tubular member 20 and the second inclined surface 3 of the fastening member 30 so that they are relatively close to each other. Is sandwiched between the first inclined surface 2 and the second inclined surface 3 to undergo a diameter reduction deformation. Accordingly, the inner peripheral surface of the sleeve 4 is pressed against the outer surface B2 of the connection end Ba of the tube B inserted into the insertion space S of the tube B, and is partially compressed and deformed. The distal end outer peripheral portion B3 at the connection end Ba is swelled and deformed so that it cannot be pulled out in the direction U opposite to the insertion direction N of the tube B.

The nipple 1 is made of a hard material such as a metal such as brass or a hard synthetic resin, for example, and is formed in a cylindrical shape having an outer diameter that is substantially the same as, slightly larger than, or slightly smaller than the inner diameter of the tube body B described later. Alternatively, for example, a plate material made of a deformable rigid material such as stainless steel is subjected to press processing or other forming processing, so that the outer diameter is approximately the same as or slightly larger than or slightly smaller than the inner diameter of the tube B. It is formed in a thin cylindrical shape.
Further, on the outer peripheral surface 1 a of the nipple 1, an unevenness portion 1 b for preventing slippage that opposes the inner surface B1 of the connection end portion Ba of the tube B, which will be described later, and the insertion direction N of the tube B (hereinafter “tube insertion direction”). It is preferable to form an abutting portion 1c facing the tip end surface B4 of the connection end Ba near the back end of N).
In the illustrated example, the concave and convex portion 1b for retaining is formed in the shape of a bamboo slab in which annular concave portions and annular convex portions are alternately continuous at the axially intermediate position of the outer peripheral surface 1a of the nipple 1.
Although not shown as another example, the outer peripheral surface 1a of the nipple 1 can 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 tube B to be described later, and is integrally formed outside the nipple 1 so as to form a double cylinder, thereby moving in the tube insertion direction N. By disposing the cylinder member 20 so as not to move, or by inserting the cylindrical member 20 formed separately from the nipple 1 so as to form a double cylinder outside the nipple 1, it becomes impossible to move in the tube insertion direction N. Are integrally attached.
On the inner peripheral surface of the cylindrical member 20, a first inclined surface 2 whose inner diameter gradually decreases in the tube insertion direction N is formed so as to face the outer peripheral surface 1 a of the nipple 1.

The fastening member 30 is made of, for example, a metal material that is not easily rusted such as stainless steel or other rigid material, and is formed in a substantially cylindrical shape having an inner diameter larger than an outer diameter of a sleeve 4 to be described later, on the nipple 1 side. On the other hand, it is arranged so as to be able to reciprocate in the tube insertion direction N and the tube removal direction U via the slide means 31.
The slide means 31 is formed across the fastening member 30 and the nipple 1 or the tubular member 20 and supports the fastening member 30 so as to be able to reciprocate in the tube insertion direction N and the tube withdrawal direction U with respect to the nipple 1.
The inner peripheral surface of the fastening member 30 is opposed to the first inclined surface 2 and the direction U opposite to the tube insertion direction N (hereinafter referred to as “tube removal direction U”), and the inner diameter gradually increases in the tube removal direction U. The smaller second inclined surface 3 is formed so as to face the outer peripheral surface 1 a of the nipple 1, or the second inclined surface 3 is integrated with the inner peripheral surface of another member inserted into the inner peripheral surface of the fastening member 30. It is formed.
The inclination angle of the second inclined surface 3 is the same as that of the first inclined surface 2 so that the second inclined surface 3 is symmetrical with the first inclined surface 2 formed on the inner peripheral surface of the tubular member 20 in the tube insertion direction N. It is preferable to make it substantially the same and to oppose a square-shaped section. As another example, the inclination angle of the first inclined surface 2 can be made looser than the inclination angle of the second inclined surface 3 so as to be substantially parallel to the outer peripheral surface 1 a of the nipple 1.
Further, on the outer peripheral surface of the fastening member 30, as a tool engaging portion 32 for rotating operation, for example, a plurality of flat portions engaged with a tool or the like as shown in the illustrated example are formed at appropriate intervals in the circumferential direction. It is preferable to form an uneven portion such as.

The sleeve 4 is formed in a substantially cylindrical shape by an elastically deformable material such as a polyacetal resin or a synthetic resin having excellent slipperiness and heat resistance on the other surface, and is inserted into the outer peripheral surface 1a of the nipple 1 and the tube B. While facing the radial direction across the space S, it is sandwiched between the first inclined surface 2 and the second inclined surface 3 so as to reciprocate in the tube insertion direction N and the tube withdrawal direction U.
Furthermore, the sleeve 4 has an elastically deformable portion 4a that elastically expands and contracts in the radial direction, and the inner diameter thereof is substantially the same as the outer diameter of the tubular body B described later at the time of expanding the diameter. Is set to be larger than the outer diameter of the tube B when the diameter is reduced.
The outer peripheral surface of the sleeve 4 is opposed to the first inclined surface 2 substantially parallel to the first tapered surface 4b, which gradually decreases in diameter in the tube insertion direction N, and the second inclined surface 3 is opposed substantially parallel to the tube. It has the 2nd taper surface 4c which becomes a small diameter gradually toward the removal direction U. As shown in FIG.
The first taper surface 4b and the second taper surface 4c have the same length and inclination angle in the tube insertion direction N on the first taper surface 4b and the length and inclination angle in the tube removal direction U on the second taper surface 4c. By doing so, it is preferable to make the whole sleeve 4 symmetrical in the tube insertion direction N and the tube removal direction U. As another example, the inclination angle of the first taper surface 4b is made smaller than the inclination angle of the second taper surface 4c so that the entire sleeve 4 is asymmetrically formed in the tube insertion direction N and the tube removal direction U. It is also possible.

As a specific example of the elastically deformable portion 4a, by forming a notch 4a1 such as a slit, a slit or a dent in a part of the sleeve 4 in the axial direction, the elastic deformation portion 4a can be elastically expanded or contracted in the radial direction to smoothly expand the diameter or The first inclined surface 2 and the second inclined surface are configured such that the tapered surface 4b is in contact with the first inclined surface 2 and the reverse tapered surface 4c is in contact with the second inclined surface 3 at the same time. 3, the taper surface 4 b and the reverse taper surface 4 c slide along the first inclined surface 2 and the second inclined surface 3, respectively, and the entire sleeve 4 is reduced in diameter. ing.
In the example shown in the figure, a plurality of slits (slits) extending linearly in the axial direction from both axial ends of the sleeve 4 are formed in a zigzag-like circumferential direction so that the overall axial length of the sleeve 4 is smoothly expanded. The diameter and the diameter can be deformed.
Although not shown in the drawings as other examples, a plurality of slits extending in the axial direction from one end of the sleeve 4 in the axial direction are formed in the circumferential direction, or one slit is formed along the entire axial length of the sleeve 4. It is also possible to form a non-linearly extending slot such as a curve.

On the inner peripheral surface of the sleeve 4, there are a protrusion 4 d that protrudes toward the outer peripheral surface 1 a of the nipple 1 and the insertion space S of the tube B in a state of being annular or close to an annular shape in the circumferential direction, and inside the tip of the protrusion 4 d. An annular seal member 6 having a peripheral end 6a protruding toward the outer peripheral surface 1a of the nipple 1 and the insertion space S of the tube body B is provided. Accordingly, it is preferable to cause the protrusion 4d and the seal member 6 to bite into the outer surface B2 of the tubular body B as the sleeve 4 is reduced in diameter.
Specifically, by moving the first inclined surface 2 of the cylindrical member 20 and the second inclined surface 3 of the fastening member 30 relatively close to each other, the sleeve 4 is deformed to reduce the diameter, and the protruding portion 4d and the seal member 6 are connected to the tube. It is configured to be pushed into the outer surface B <b> 2 of the body B so as to be bitten.
It is preferable that a plurality of the protruding portions 4d are formed to protrude in the tube insertion direction N and the tube pull-out direction U at intervals. In this case, as the entire diameter of the sleeve 4 is reduced, the plurality of protrusions 4d are partially pressed against the outer surface B2 of the tubular body B to compress and deform, thereby expanding the outer surface B2 of the tubular body B. Even if the protruding and deformed portion is sandwiched between the protrusions 4d and a creep (permanent strain) phenomenon occurs in the tube body B, the press contact portion with the sleeve 4 is held, and the sealing performance can be maintained high. .
As shown in FIG. 2A, the seal member 6 is formed in an annular shape from a material that can be compressed and deformed, such as rubber, and an outer peripheral portion of the seal member 6 is formed on the inner peripheral surface of the sleeve 4. On the other hand, the inner peripheral end 6a of the sealing member 6 is positioned so as to protrude toward the outer surface B2 of the tubular body B by being disposed so as to be immovable by fitting or the like. Furthermore, the inner peripheral surface of the seal member 6 is curved and formed in a substantially arc shape in cross section, and a concave groove portion 6b into which a bulging deformed portion enters when the seal member 6 is compressed and deformed is formed on the surface. preferable.
In the illustrated example, a plurality of protrusions 4d are provided in the axial direction on the inner peripheral surface of the sleeve 4, and an annular mounting recess 4e is formed at an intermediate position in the axial direction, and the annular mounting recess 4e is formed. For example, an elastically deformable seal member 6 such as an O-ring is fitted and held so as not to move in the axial direction.
Although not shown as another example, a part or all of the axial direction on the inner peripheral surface of the sleeve 4 is provided on the inner peripheral surface of the sleeve 4 without providing either or both of the protrusion 4d and the seal member 6 on the inner peripheral surface of the sleeve 4. It is also possible to form it smoothly.

On the back side in the tube insertion direction N with respect to the sleeve 4, an annular recess 5 is provided so as to communicate with the insertion space S of the tube body B in a radial direction via the stepped portion 5a. Specifically, a stepped portion 5 a is provided at the back end in the tube insertion direction N of the sleeve 4, and an annular recess is formed between the sleeve 4 and the first inclined surface 2 disposed on the back side in the tube insertion direction N. 5 or a step portion 5a and an annular recess 5 are continuously formed in the tube insertion direction N at the back end in the tube insertion direction N on the first inclined surface 2.
The annular recess 5 is opposed to the inner surface of the nipple 1 in the radial direction across the insertion space S of the tube body B and the rear side portion in the tube insertion direction N rather than the position facing the sleeve 4 via the stepped portion 5a. And is formed so as to communicate with the insertion space S of the tubular body B. The annular recess 5 is the maximum inner diameter of the inner peripheral surface at the time of the diameter reduction of the sleeve 4 or larger than the minimum inner diameter of the first inclined surface 2, and the inner side surface in the tube removal direction U is defined as a stepped portion 5 a. It is formed so as to be substantially perpendicular to the inner bottom surface of the annular recess 5.
Further, the annular recess 5 is connected to the tubular body B, which will be described later, along with the diameter-reducing deformation of the sleeve 4 due to the relative close movement of the first inclined surface 2 of the cylindrical member 20 and the second inclined surface 3 of the fastening member 30. The distal end outer peripheral portion B3 at the end portion Ba is configured to bulge and deform into an annular shape and fit into the annular recess 5.

On the other hand, the tube B is, for example, a hose or a tube formed of a soft synthetic resin such as vinyl chloride, or a soft material such as silicone rubber or other rubber, and the inner surface B1 and the outer surface B2 are flat. Is preferred.
As a specific example of the tube B, a hose having a single layer structure is used in the illustrated example.
Although not shown as another example of the tubular body B, a plurality or a single synthetic resin blade (reinforcing thread) is embedded in a spiral as an intermediate layer between the transparent or opaque outer layer and inner layer. Laminated hose (blade hose), and a spiral reinforcing hose (four) that is formed by spirally winding a strip reinforcing material such as a synthetic resin or metal cross section rectangle and a linear reinforcing material such as a circular section as a middle layer. It is also possible to use various types of tubular bodies having different structures such as a run hose), a spiral reinforcing hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape.

  According to such a pipe joint A according to the embodiment of the present invention, as shown in FIG. 1A, a pipe is directed toward the insertion space S of the pipe body B formed along the outer peripheral surface 1 a of the nipple 1. The connection end Ba of the body B is inserted, and the tip end surface B4 at the connection end Ba reaches the back side in the tube insertion direction N with respect to the first inclined surface 2 as shown in FIG. Thus, for example, when the fastening member 30 is moved in the tube insertion direction N by the slide means 31 and the first inclined surface 2 and the second inclined surface 3 are moved relatively close to each other, the sleeve 4 is moved along them. As the taper surface 4b and the reverse taper surface 4c slide, the entire sleeve 4 is gradually reduced in diameter.

Thereby, the inner peripheral surface of the sleeve 4 is pressed against the outer surface B2 of the tube B, and the outer surface B2 of the tube B is partially compressed and deformed, so that the inner peripheral surface of the sleeve 4 is the outer surface of the tube B. At the same time as it bites into B2, this compressed and deformed volume is swelled and fitted from the outer peripheral portion B3 of the tube B toward the annular recess 5, and this bulged and deformed tip outer peripheral portion B3 enters the step portion 5a. On the other hand, the entire tubular body B is held immovable in the tube removal direction U by being caught in the tube removal direction U.
Therefore, even if a creep phenomenon occurs in the tube B due to a change with time and the thickness of the pressure contact portion with the sleeve 4 becomes thin, the bulging and deformed tip outer peripheral portion B3 of the tube B is caught by the step portion 5a. By continuing, the pull-out strength of the tube B can be maintained high.

In particular, when the annular sealing member 6 is provided on the inner peripheral surface of the sleeve 4 so that the inner peripheral end 6a protrudes toward the insertion space S of the tube B, the first inclined surface 2 and the second inclined surface 2 are provided. As the sleeve 4 is reduced in diameter along with the relative movement of the surface 3, the inner peripheral end 6 a of the seal member 6 protruding from the inner peripheral surface of the sleeve 4 bites into and adheres to the outer surface B 2 of the tube body B.
Therefore, even if a creep phenomenon occurs in the tube body B and the thickness dimension of the pressure contact portion with the sleeve 4 becomes thin, the sealing performance can be maintained high.
As a result, compared with the conventional one in which the wedge ring is reduced in diameter due to the approaching movement of the inclined surfaces facing each other and the inner peripheral surface of the wedge ring is pressed against the outer peripheral surface of the connecting pipe, the tube B has a longer period regardless of the creep phenomenon. It can be hermetically held over a further time, and further improvement in safety can be achieved.
Furthermore, the wall thickness of the nipple 1 can be reduced compared with the case where an annular seal member is embedded in the outer peripheral surface 1a of the nipple 1 facing the inner surface B1 of the tube B, and the flow rate through the nipple 1 is thereby reduced. Is not reduced, a large step is not formed between the nipple 1 and the inner surface B1 of the tubular body B, contamination (contamination) due to accumulation of soot and the like can be prevented, and hygiene can be maintained for a long time. it can.

Furthermore, when a plurality of projections 4d projecting toward the insertion space S of the tube B are arranged on the inner peripheral surface of the sleeve 4 in the insertion direction (tube insertion direction) N of the tube B at predetermined intervals, respectively. Is a portion B2a sandwiched between the protrusions 4d on the outer surface B2 of the tubular body B as the entire diameter of the sleeve 4 is reduced due to the relatively close movement of the first inclined surface 2 and the second inclined surface 3. Bulges and deforms, the bulging deformation part B2a is sandwiched between the protrusions 4d, and the tubular body B becomes immovable in the tubular pull-out direction U. At the same time, a creep (permanent strain) phenomenon occurs in the tubular body B. Even so, the pressure contact portion with the sleeve 4 is maintained.
Therefore, even if a creep phenomenon occurs in the tube body B, it is possible to maintain a high pull-out strength and sealing performance.
As a result, the tubular body B can be prevented from coming off for a longer period of time regardless of the creep phenomenon, and the high sealing performance can be maintained, thereby further improving the safety.

In addition, the first tapered surface 4b facing the first inclined surface 2 and the second tapered surface 4c facing the second inclined surface 3 are arranged on the outer peripheral surface of the sleeve 4 in the insertion direction of the tube B (the tube insertion direction). ) When formed so as to have a symmetric shape in N and the reverse direction (tube pull-out direction) U, the sleeve 4 is placed between the first inclined surface 2 of the tubular member 20 and the second inclined surface 3 of the fastening member 30. Even if the first taper surface 4b and the second taper surface 4c are arranged so as to be in either forward or reverse directions, the diameter of the first taper surface 4b and the second taper surface 3 are similarly reduced by the relative movement of the first inclined surface 2 and the second inclined surface 3. To do.
Therefore, the sleeve 4 can be assembled in either the forward or reverse direction.
As a result, the assembly of the sleeve 4 is facilitated and assembly errors can be reduced.
Next, each embodiment of the present invention will be described with reference to the drawings.

This Example 1 shows the case where the annular recessed part 5 is formed through the step part 5a in the back | inner side end of the pipe | tube insertion direction N in the sleeve 4, as shown to FIG. 1 (a) (b) and FIG. Is.
More specifically, in the sleeve 4, the back end surface in the tube insertion direction N is a stepped portion 5 a, and the annular recess 5 is formed across the cylindrical member 20 having the first inclined surface 2 adjacent to the stepped portion 5 a. The outer peripheral surface B2 of the tubular body B that has been compressed and deformed along the stepped portion 5a serving as the back end surface of the sleeve 4 by causing the inner peripheral surface to bite into the outer surface B2 of the tubular body B along with the radial deformation. The sleeve 4 is configured to bulge and deform to a larger diameter than the maximum inner diameter of the inner peripheral surface of the sleeve 4 when the diameter is reduced.

Furthermore, in the first embodiment, as the slide means 31 that moves the fastening member 30 in the axial direction with respect to the nipple 1, a screw portion that is screwed together is used.
In the example shown in FIGS. 1A and 1B and FIG. 2, the fastening member 30 that forms the second inclined surface 3 is a nut in which an internal thread portion is engraved as the sliding means 31, and the internal thread portion is By being screwed into a male screw portion 21 engraved on the outer peripheral surface of the cylindrical member 20, the cylindrical member 20 is attached to the nipple 1 side so as to be capable of reciprocating in the axial direction. By rotating the fastening member 30 and moving the second inclined surface 3 closer to the first inclined surface 2 of the tubular member 20, the first tapered surface 4b and the second tapered surface 4c of the sleeve 4 are substantially the same. The diameter is uniformly reduced.
By the way, in the case where metal screw parts that are screwed together are used as the sliding means 31, when both screw parts are screwed together with tightening, heat due to friction is generated at the screwed parts, and this frictional heat is generated. When both screw portions expand, the so-called “galling (burn-in)” may occur that the two screw portions are in close contact and do not move. In order to prevent this, it is preferable that either one of the female screw portion and the male screw portion is made of a non-metal or the like so that frictional heat is not generated at the screwed portion during tightening.
In the illustrated example, the cylindrical member 20 having the first inclined surface 2 is integrally formed on the outer side of the nipple 1 so as to be opposed to each other in the radial direction with the insertion space S of the tube body B interposed therebetween. ing.

Further, in the example shown in FIGS. 1A and 1B, a protruding portion that slightly protrudes from the outer peripheral surface 1a of the nipple 1 is formed as an abutting portion 1c that faces the distal end surface B4 of the tubular body B. Further, on the outer side, the distal end surface B4 of the tubular body B forms a space that can be expanded and deformed.
Although not shown as another example, it is possible to form the abutting portion 1c so as to project vertically from the outer peripheral surface 1a of the nipple 1 so that the entire distal end surface B4 abuts by insertion of the tube body B. is there.
In the first embodiment, an attachment recess 4e for attaching the seal member 6 is integrally formed on the inner peripheral surface of the sleeve 4 in the center of the tube insertion direction N and the tube withdrawal direction U, and the tube is inserted across the attachment recess 4e. By integrally forming a plurality (two) of protrusions 4d on the direction N side and the tube removal direction U side, the entire sleeve 4 is configured to be symmetrical in the tube insertion direction N and the tube removal direction U. ing.

Further, a joint body 10 is formed on the back side in the tube insertion direction N in the nipple 1.
In the first embodiment, as the joint body 10, a screw portion 10a for connecting the pipe joint A to a pipe connection port (not shown) of another device, and a tool (not shown) such as a spanner or a wrench. Tool engaging portions 10b that engage with each other are formed integrally with the nipple 1, and can be attached to and detached from other devices by screwing the screw portion 10a to a screw portion (not shown) formed in another pipe line. Connected to.
ing.
When the internal thread is engraved on the inner peripheral surface of the pipe connection port in other equipment (not shown) connected to the pipe joint A, the threaded portion 10a is engraved with the corresponding external thread. Set up. Moreover, when an external screw is engraved on the outer peripheral surface of the pipe connection port in another device, an internal screw corresponding to this is engraved. In the illustrated example, an external screw is engraved as the screw portion 10a.
As the tool engaging portion 10b, a hexagon nut having a diameter larger than that of the hexagon nut partially formed as the tool engaging portion 32 for rotating operation is formed at one end in the axial direction on the outer peripheral surface of the fastening member 30. .
Although not shown as another example, it is also possible to form the threaded portion 10 a and the tool engaging portion 10 b as the joint body 10 separately from the nipple 1 and attach them detachably to the nipple 1.

According to such a pipe joint A according to the first embodiment of the present invention, as shown in FIGS. 1 (a) and 1 (b) and FIG. When the sleeve 4 is reduced in diameter by being moved in a tightening direction N and moved closer to the second inclined surface 3 toward the first inclined surface 2, the inner peripheral surface of the sleeve 4 (protrusion 4d or seal member). 6) is pressed against the outer surface B2 of the tubular body B, and the outer surface B2 of the tubular body B is partially compressed and deformed, and at the same time, this compressed and deformed capacity is transferred to the annular recess 5 along the stepped portion 5a. The sleeve 4 bulges and deforms to a larger diameter than the maximum inner diameter of the inner peripheral surface when the diameter of the sleeve 4 is reduced.
As a result, the tip outer peripheral portion B3 bulging and deforming in the tube B is hooked in the tube pull-out direction U with respect to the stepped portion 5a, so that the entire tube B is held immovably in the tube pull-out direction U.
Accordingly, there is an advantage that the pull-out strength can be maintained high in accordance with the creep phenomenon of the tube B while having a simple structure.

  Further, as shown in the illustrated example, when a projecting portion that slightly protrudes from the outer peripheral surface 1a of the nipple 1 is formed as the abutting portion 1c facing the distal end surface B4 of the tube B, the diameter of the sleeve 4 is reduced. Accordingly, when the inner peripheral surface bites into the outer surface B2 of the tubular body B, the distal end surface B4 of the tubular body B is inflated and deformed to the back side in the tube insertion direction N rather than the convex portion that becomes the abutting portion 1c. There is also an advantage that the inner peripheral surface of the sleeve 4 can be further tightened with respect to the outer surface B <b> 2 of the tube body B, so that the sleeve 4 can be deeply bitten.

In the second embodiment, as shown in FIGS. 3A and 3B, the annular recess 5 is formed in the tubular member 20 at the back end in the tube insertion direction N of the first inclined surface 2 via the step portion 5a. 1 is different from the first embodiment shown in FIGS. 1A, 1B, and 2, and other configurations are the same as those in the first embodiment shown in FIGS. 1A, 1B, and 2. It is.
More specifically, a stepped portion 5a and an annular recess 5 are formed in the tubular member 20 so as to be continuous with the rear side end of the first inclined surface 2, and the inner peripheral surface of the sleeve 4 is piped as the sleeve 4 is reduced in diameter. By pressing the outer surface B2 of the body B against the outer surface B2, the outer surface B2 of the tube body B that has been compressed and deformed is along the stepped portion 5a that becomes the back end of the first inclined surface 2, and the minimum inner diameter of the first inclined surface 2 It is configured to bulge and deform to a larger diameter.

  In the example shown in FIGS. 3A and 3B, the cylindrical member 22 formed separately from the cylindrical member 20 formed integrally with the outside of the nipple 1 is fitted so as not to move in the tube insertion direction N. By being inserted, the first inclined surface 2 formed on the inner peripheral surface of the cylindrical member 22 is arranged so as to face the radial direction across the outer peripheral surface 1a of the nipple 1 and the insertion space S of the tubular body B. Yes.

According to such a pipe joint A according to the second embodiment of the present invention, as in the example shown in FIGS. 3A and 3B, the fastening member 30 is screwed into the pipe insertion direction N by screwing to become the slide means 31. When the sleeve 4 is reduced in diameter by being moved by tightening and moving the second inclined surface 3 toward the first inclined surface 2, the inner peripheral surface (the protruding portion 4 d and the seal member 6) of the sleeve 4 is moved. At the same time, the outer surface B2 of the tube body B is partially compressed and deformed by being pressed against and bitten on the outer surface B2 of the tube body B. The first inclined surface 2 bulges and deforms to a larger diameter than the minimum inner diameter.
As a result, the tip outer peripheral portion B3 bulging and deforming in the tube B is hooked in the tube pull-out direction U with respect to the stepped portion 5a, so that the entire tube B is held immovably in the tube pull-out direction U.
Therefore, as compared with the first embodiment shown in FIGS. 1A, 1B, and 2, it is related to the amount of biting of the inner peripheral surface (protrusion 4d and seal member 6) of the sleeve 4 with respect to the outer surface B2 of the tube B. In addition, there is an advantage that the amount of bulging deformation at the outer peripheral portion B3 of the distal end of the tubular body B fitted into the annular recess 5 can be kept constant, and the pull-out strength can be maintained high corresponding to the creep phenomenon of the tubular body B. is there.

As shown in FIGS. 4 (a) and 4 (b), the third embodiment has a structure in which the first inclined surface 2 and the second inclined surface 3 move relative to the first inclined surface 2 in the sleeve 4. A stopper 2a with which the rear side end 4f of the tube body B insertion direction (tube insertion direction) N abuts is provided, and along with the relative approaching movement of the first inclined surface 2 and the second inclined surface 3 by the fastening member 30, A configuration in which the stopper 2a of the first inclined surface 2 and the back end 4f of the sleeve 4 are brought into contact with each other, and the second tapered surface 4c opposed to the second inclined surface 3 in the sleeve 4 is deformed to the smallest diameter is shown in FIG. Unlike Example 1 shown in a) (b) and FIG. 2 and Example 2 shown in FIGS. 3 (a) and (b), other configurations are shown in FIGS. 1 (a), (b) and FIG. It is the same as Example 1 shown and Example 2 shown to Fig.3 (a) (b).
More specifically, a stopper 2a facing the back side end 4f of the sleeve 4 in the tube insertion direction N is formed in a concave shape near the back side end of the first inclined surface 2 in the tube insertion direction N. As the first inclined surface 2 and the second inclined surface 3 move relative to each other, the sleeve 4 first moves in the tube insertion direction N while being deformed in a reduced diameter, and the rear end 4f in the tube insertion direction N Comes into contact with the stopper 2a. Thereafter, the second inclined surface 3 is changed to the first inclined surface 2 of the tubular member 20 by further operation of the fastening member 30 in a state where the inner end 4f of the sleeve 4 in the tube insertion direction N is in contact with the stopper 2a. The second inclined surface 3 is configured so that the second tapered surface 4c of the sleeve 4 is mainly deformed in the most reduced diameter by moving toward and away from it.

In the example shown in FIGS. 4A and 4B, a sleeve 4 is used in which the first tapered surface 4b and the second tapered surface 4c are symmetrically formed in the tube insertion direction N and the tube removal direction U. Yes. By moving the second inclined surface 3 toward the first inclined surface 2 by rotating the tightening member 30, first, as shown in FIG. The rear end 4f in the tube insertion direction N comes into contact with the stopper 2a and the rear end in the tube insertion direction N of the sleeve 4 comes into contact with the stopper 2a.
Thereafter, when the second inclined surface 3 is moved closer to the first inclined surface 2 by further rotating the fastening member 30, the second inclined surface 3 causes the sleeve 4 to not only the second tapered surface 4 c but also the first one. The substantially entire outer peripheral surface of the elastically deforming portion 4 a excluding the tapered surface 4 b is pressed so as to incline in a straight line along the second inclined surface 3. That is, in the sleeve 4, the second inclined surface 3 is reduced in diameter than the first tapered surface 4b, and the inner peripheral portion of the second tapered surface 4c and the annular seal member 6 are most reduced in diameter. .
As a result, the inner peripheral portion of the second tapered surface 4c is pressed most into the outer surface B2 of the tube B, and the inner peripheral portion of the second tapered surface 4c and the annular seal member 6 are cut into the outer surface B2 of the tube B. The parts that come into contact with each other are concentrated and partially tightened.
Although not shown as another example, the inclination angle of the first inclined surface 2 is made smaller than the inclination angle of the second inclined surface 3 so as to be substantially parallel to the outer peripheral surface 1a of the nipple 1, and the first taper. It is also possible to use the sleeve 4 formed so that the inclination angle of the surface 4b is asymmetrical in the tube insertion direction N and the tube removal direction U, which is looser than the inclination angle of the second tapered surface 4c.

Further, in the example shown in FIGS. 4A and 4B, a see-through window 2b is provided at a location in the tubular member 20 that faces the abutting portion 1c formed on the outer peripheral surface 1a of the nipple 1 in the radial direction. Te, the outer peripheral surface 1a which is formed in abutment portion 1c of the nipple 1, the distal end surface B4 of the tube B is to be able to check reliably butted visually those just not.
In the state where the slide means (female screw portion) 31 of the tightening member 30 is screwed into the male screw portion 21 of the cylindrical member 20 and tightened, the see-through window 2b is tightened as shown in FIG. It is covered with the member 30 so as not to be exposed.
In the example shown in FIGS. 4 (a) and 4 (b), an uneven portion 1b for retaining is arranged at a position facing the inner peripheral portion of the second tapered surface 4c and the annular seal member 6 in the nipple 1. ing.

According to such a pipe joint A according to the third embodiment of the present invention, as the first inclined surface 2 and the second inclined surface 3 are relatively moved by the fastening member 30, the tube 4 is inserted into the stopper 2a. By making the rear end 4f in the direction N abut, further movement of the sleeve 4 is prevented, and the second inclined surface 3 is moved closer to the first inclined surface 2 and the second inclined surface 3 is moved closer to the second inclined surface 3 in the sleeve 4. The second taper surface 4c facing the inclined surface 3 is deformed to the smallest diameter, and the inner peripheral portion of the second taper surface 4c is pressed into the outer surface B2 of the tubular body B and bites most.
Therefore, the fastening area of the sleeve 4 by the fastening member 30 can be reduced.
As a result, the relative relationship between the first inclined surface 2 and the second inclined surface 3 by the fastening member 30 as in the examples shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 and 3 (a) and 3 (b). A sleeve formed by a fastening member 30 for various types of tube bodies B having different structures as compared to a structure in which the first tapered surface 4b and the second tapered surface 4c of the sleeve 4 are substantially uniformly reduced in diameter as they approach. 4 tightening torque can be reduced.
Thereby, even if the structure of the tube body B changes, there is an advantage that the tube connection is easy but the sealing property is excellent.
Further, as shown in the example shown in FIGS. 4A and 4B, the uneven portion 1b for retaining is arranged at a position facing the inner peripheral portion of the second tapered surface 4c and the annular seal member 6 in the nipple 1. In this case, there is an advantage that the sealing effect and the retaining effect are excellent.

  In the fourth embodiment, as shown in FIGS. 5A, 5B and 6, the inner peripheral surface of the sleeve 4 is smooth along the insertion space S of the tube B and does not protrude beyond the protrusion 4d. A configuration in which a surface pressure portion 4g is provided and the surface pressure portion 4g is disposed so as to face the opening end 1d of the nipple 1 when the sleeve 4 is deformed is shown in FIGS. Unlike the first embodiment shown in FIG. 1 and the second embodiment shown in FIGS. 3A and 3B and the third embodiment shown in FIGS. 4A and 4B, other configurations are the same as those shown in FIGS. ) And Example 2 shown in FIG. 2, Example 2 shown in FIGS. 3 (a) and 3 (b), and Example 3 shown in FIGS. 4 (a) and 4 (b).

In the example shown in FIGS. 5A and 5B and FIG. 6, an attachment recess 4 e for attaching the seal member 6 is integrally formed on the inner peripheral surface of the sleeve 4 in the center in the tube insertion direction N and the tube removal direction U. The protrusion 4d is disposed one by one on the tube insertion direction N side and the tube withdrawal direction U side with the mounting recess 4e interposed therebetween, and the surface pressure portion 4g is integrally formed at both ends, thereby forming the entire sleeve 4 Are configured to be symmetrical in the tube insertion direction N and the tube removal direction U.
In the example shown in FIG. 6, a plurality of recessed portions 4 h are formed in the circumferential direction in the tapered surface 4 b and the reverse tapered surface 4 c of the sleeve 4, respectively, so that the first inclined surface 2 of the tubular member 20 and the fastening member 30 are formed. By reducing the contact area with the second inclined surface 3, the entire sleeve 4 is smoothly reduced in diameter as the first inclined surface 2 and the second inclined surface 3 move relative to each other. It is composed.
Further, although not shown as another example, the tapered portion 4 h and the reverse tapered surface 4 c of the sleeve 4 are not formed with the recess 4 h, and as shown in the first, second, and third embodiments, a smooth circle is provided. It is also possible to form on the peripheral surface.

Furthermore, in Example 4, a flange portion 10 c is integrally formed as a joint body 10 on the back side in the tube insertion direction N of the nipple 1.
The flange portion 10c is joined to a flange portion (not shown) having the same shape formed in another device (not shown) connected to the pipe joint A, and an annular coupling member (not shown) is stretched over these flange portions. ) Is detachably connected to other devices.
In the illustrated example, an annular groove 10d into which an annular sealing material (not shown) such as an O-ring is fitted is provided in the connection end face of the flange portion 10c.
Although not shown as another example, it is also possible to form the flange portion 10 c as the joint body 10 separately from the nipple 1 and attach it detachably to the nipple 1.

According to such a pipe joint A according to the fourth embodiment of the present invention, the entire surface of the sleeve 4 due to the relative close movement of the first inclined surface 2 and the second inclined surface 3 is reduced, and the smooth surface pressure is reduced. Even if the protrusion 4d is disposed near the opening end 1d of the nipple 1, the portion 4g faces the outer surface B2 of the tube B so as to face the opening end 1d of the nipple 1, so that the tube B The inner surface B1 does not bulge and deform inside the inner peripheral surface 1e of the nipple 1.
Therefore, the fluid passing through the inside of the tube B and the nipple 1 can pass smoothly without resistance.
As a result, there is an advantage that a reduction in flow rate and pressure loss passing through the tube B and the nipple 1 can be prevented.

In the first embodiment, the second embodiment, and the third embodiment, the case where the screw portion 10a and the tool engaging portion 10b are formed as the joint body 10 on the back side in the tube insertion direction N of the nipple 1 is shown. However, the flange portion 10c may be formed as the joint body 10 as in the fourth embodiment, instead of the screw portion 10a and the tool engaging portion 10b.
On the other hand, in the fourth embodiment, the case where the flange portion 10c is formed as the joint body 10 on the back side in the tube insertion direction N of the nipple 1 is shown, but the present invention is not limited thereto, and the flange portion 10c is not limited thereto. Instead of this, the screw portion 10a and the tool engagement portion 10b may be formed as in the first embodiment.
Furthermore, in the illustrated example, the female screw part 21 and the male screw part 21 that are screwed together are formed as the slide means 31 that moves the fastening member 30 in the axial direction with respect to the nipple 1. As long as the fastening member 30 can be moved in the axial direction, a structure other than a screw may be used.
Moreover, although the hose of the single layer structure was used as the pipe body B and it changed to a laminated hose, a spiral reinforcement hose, etc. besides that was demonstrated, it is not limited to this, A tube etc. may be used instead of a hose.

1 Nipple 1a Outer peripheral surface 1d Open end 20 Cylindrical member 2 First inclined surface 2a Stopper 30 Tightening member 3 Second inclined surface 4 Sleeve 4b First tapered surface 4c Second tapered surface 4d Protruding portion 4f Back end of sleeve 4g Surface pressure part 5 Annular recess 5a Step part 6 Seal member 6a Inner peripheral end B Tube B1 Inner surface B3 End peripheral part S Tube insertion space N Tube insert direction (tube insert direction) U Tube insert direction and Reverse direction (Pipe removal direction)

Claims (5)

A nipple provided along the insertion space of the flexible tubular body;
A first inclined surface provided so as to face the outer peripheral surface of the nipple in the radial direction across the insertion space of the tubular body, and formed so that the inner diameter gradually decreases in the insertion direction of the tubular body A cylindrical member having
The outer peripheral surface of the nipple and the insertion space of the tube body are opposed to each other in the radial direction, the first inclined surface is opposed to the insertion direction of the tube body, and relative to the first inclined surface. A tightening member having a second inclined surface formed so as to be reciprocally movable in the insertion direction of the tubular body, and formed so that an inner diameter gradually decreases in a direction opposite to the insertion direction of the tubular body;
The outer peripheral surface of the nipple and the insertion space of the tube body are opposed to each other in the radial direction, and the tube body can be reciprocated in the insertion direction of the tube body between the first inclined surface and the second inclined surface. And a sleeve that is elastically deformable in the radial direction, and that is formed so as to be reduced in diameter as the first inclined surface and the second inclined surface move relative to each other.
The first inclined surface of the tubular member comes into contact with the back end in the insertion direction of the tubular body in the sleeve as the first inclined surface and the second inclined surface relatively move. With a concave stopper,
The sleeve has a first tapered surface that faces the first inclined surface and a second tapered surface that faces the second inclined surface, and the sleeve includes a first tapered surface and a second inclined surface formed by the fastening member. As the relative approaching movement occurs, the back end of the sleeve comes into contact with the stopper, and the second tapered surface is reduced in diameter than the first tapered surface so as to incline along the second inclined surface. A portion of the tube body is compressed and partially tightened between the inner peripheral portion of the second tapered surface and the outer peripheral surface of the nipple;
Provided on the inner peripheral surface of the sleeve is a protrusion that protrudes toward the insertion space of the tube, and a surface pressure portion that is smooth along the insertion space of the tube and does not protrude from the protrusion, A pipe joint characterized in that the surface pressure portion is arranged so as to face the opening end of the nipple when the sleeve is reduced in diameter . The back side end of the sleeve is formed thicker than the amount of recess of the stopper, and the back side end abuts on the stopper, so that the outer periphery of the nipple from the inner peripheral surface of the cylindrical member. An annular recess on the inner peripheral surface of the tubular member on the inner side in the insertion direction of the tubular body than the stepped portion, and a diameter of the insertion space of the tubular body. Formed to communicate with each other in opposite directions,
The annular recess is larger in diameter than the inner diameter of the sleeve when the diameter of the sleeve is reduced, and is fitted into the annular recess by causing the outer peripheral portion of the tubular body to bulge and deform in accordance with the diameter reduction of the sleeve. pipe joint according to claim 1, characterized in that it is formed so as to. The pipe joint according to claim 1 or 2 , wherein an annular seal member is provided on an inner peripheral surface of the sleeve so that an inner peripheral end thereof protrudes toward the insertion space of the pipe body.   3. A plurality of protrusions protruding toward the insertion space of the tube body in the insertion direction of the tube body at predetermined intervals on the inner peripheral surface of the sleeve. The described pipe joint. On the outer peripheral surface of the sleeve, a first tapered surface facing the first inclined surface and a second tapered surface facing the second inclined surface are symmetrical in the insertion direction and the reverse direction of the tubular body, respectively. pipe joint according to claim 1 or 2, wherein the formed such that.

Images