JP2007205461A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of strongly preventing a pipe from coming out against extraction force applied to the pipe in the axial direction and positively preventing leakage of a fluid to the outside while having a simple structure, and to provide a pipe joint having a small pipe passage resistance and capable of promptly performing a piping connecting construction with a small rotational torque. <P>SOLUTION: The pipe joint is equipped with a pipe joint main body 1, a cap nut 2, and a spacer 3 having a receiving face 30 orthogonal to an an axial center L attached on a one end 17 side of the pipe joint main body 1. Further, the pipe joint includes an engagement ring 5 whose cross sectional shape including the axial line L in a state of the cap nut unfastened is a truncated chevron shape. By screwing of the cap nut 2 to a male screw 36 of the pipe joint main body 1, and erecting and deforming the engagement ring 5 substantially orthogonally to the axial center L at the inner receiving face 30 and an inner flange part 22 of the cap nut 2, an inner peripheral edge 50 of the engagement ring 5 is made to bite an outer peripheral face 9a of the pipe 9 for pipe coming-out prevention. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint.

As a conventional pipe joint, the joint body is provided with a cylindrical tightening part (slit ring) and a guide part that externally and internally fits the end of the pipe, and a cap nut is attached to the slit ring of the joint body. Is known to be connected to the slit ring and the guide portion by sandwiching the end portion of the pipe in an outer fitting / inner fitting shape by screwing onto a male screw on the outer peripheral surface of the outer circumference (see, for example, Patent Document 1). ). Further, a circumferential groove portion is formed on the outer peripheral surface of the guide portion of the joint body, and a sealing material (O-ring) is fitted therein, and is brought into contact with the inner peripheral surface of the pipe to be sealed.
Japanese Patent Laid-Open No. 7-248087

  In such a conventional pipe joint, the end portion of the pipe is sandwiched and connected between the tightening portion and the guide portion of the joint body, so the axial direction larger than the frictional force applied to the pipe by the sandwiching If the pulling force is applied, there is a risk that it will come out easily. Further, the inner diameter of the pipe joint is smaller than the inner diameter of the pipe, and there is a disadvantage that the pipe resistance of the fluid is increased.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pipe joint that has a simple structure and firmly prevents the drawing force in the axial direction applied to the pipe, and reliably prevents external leakage of fluid. And
It is another object of the present invention to provide a pipe joint that has a small pipe resistance and can quickly perform pipe connection work with a small rotational torque.

  In order to achieve the above-described object, the pipe joint according to the present invention is configured such that a locking ring having a cross-sectional shape including a shaft center rises substantially orthogonally to the shaft center by screwing of a cap nut. By deforming, the inner peripheral edge of the locking ring is bitten into the outer peripheral surface of the pipe to prevent the pipe from being removed.

  In addition, a pipe joint according to the present invention includes a joint body and a cap nut, and includes a spacer having a receiving surface orthogonal to an axis attached to one end side of the joint body, A cross-sectional shape including the shaft center in an untightened state has a C-shaped locking ring, and the receiving surface and the inner side of the cap nut are moved by screwing the cap nut onto the male screw of the joint body. By making the locking ring stand up and deform substantially perpendicular to the shaft center at the flange, the inner peripheral edge of the locking ring is bitten into the outer peripheral surface of the pipe so as to prevent the pipe from being removed. It is configured.

  Further, the joint main body has a first step portion near the one end and a second step portion on the back side on the inner peripheral surface, and the spacer is fitted so as to contact the first step portion, A concave groove that is long in the axial direction is formed between the inner surface of the spacer and the second stepped portion, and a first O-ring, a flat washer-shaped intermediate spacer, and a second O-ring are sequentially fitted in the concave groove. The two O-rings were pressed against the outer peripheral surface of the pipe and sealed.

In addition, the cap nut has a small protrusion for locking at the end on the joint body side, and the joint body is engaged with the small protrusion at a predetermined interval in the axial direction. The first and second small step portions that are removably locked, and the small protrusion of the cap nut is locked to the first small step portion,
When the locking ring maintains the square shape and the small protrusions are locked to the second small step portion, the locking ring stands up substantially perpendicular to the shaft center. Corresponds to the deformation prevention state.

  Further, in the retaining state in which the locking ring is sandwiched between the spacer and the inner flange portion of the cap nut and is erected and deformed substantially perpendicularly to the shaft center, the locking ring has a small bow shape. The inner peripheral edge of the pipe is deformed so as to bite into the outer peripheral surface of the pipe in a press-fit manner, or the edge is raised and bitten.

The present invention has the following remarkable effects.
In the pipe joint according to the present invention, since the locking ring bites into the outer peripheral surface of the pipe and gives a strong pulling-inhibiting force, the pipe is not easily pulled out even when receiving a force in the pulling direction.
In addition, the locking ring is deformed into a small bow shape, and its inner peripheral edge is difficult to press-fit into the outer peripheral surface of the pipe, or bites into the outer peripheral surface of the pipe, making it stronger against pulling force to the pipe. It is secured.
Moreover, by simply screwing the cap nut with a light force (small torque), the locking ring is erected from the cross-sectional shape including the shaft center so that it rises substantially perpendicular to the shaft center. Therefore, the connection work can be performed easily and quickly.

  In addition, since two O-rings are disposed in the joint body and sealed against the outer peripheral surface of the pipe, fluid leakage can be reliably prevented. Further, by fitting the first O-ring, the intermediate spacer, the second O-ring, and the spacer inside the joint body, the two O-rings are respectively housed in the concave grooves. Therefore, in manufacturing the joint main body, the difficult cutting work of machining two small concave grooves (for storing two O-rings respectively) on the inner peripheral surface is unnecessary. Manufacturing becomes easy and mass production becomes possible.

Further, before the pipe connection work (before the cap nut is screwed), the first small step portion of the joint body and the small protrusion for locking the cap nut are locked, so that the cap nut is removed from the joint body. It is not screwed out, and can be kept in a set state before connection work, so that each component is not disassembled and lost. Moreover, it is only necessary to insert the pipe as it is, and it is not necessary to combine the parts on site, so that the working time can be shortened.
In addition, after the cap nut is tightened (screwed) and the small protrusion is locked to the second small stepped portion, the cap nut is not screwed out, so that the completed connection is not loosened and the pipe Connection is further strengthened.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 to 9 show an embodiment of a pipe joint according to the present invention, which includes a joint body 1 having a male screw 36 and a cap nut 2 having a female screw 26 screwed to the male screw 36. . The pipe connected to this pipe joint is made of copper pipe, brass, plastic, etc., and uses liquid such as water and hot water, fluid such as refrigerant liquid and gas for air conditioner, and oil.
First, as shown in FIGS. 1 to 4, the outer peripheral surface 15 of the joint body 1 has a male screw 36, a first small step portion 41, and a first small step in order from the one end 17 side to the base end 18 side. And a second small step portion 42 disposed at a predetermined interval P in the axial center L direction than the portion 41. Specifically, on the outer peripheral surface 15 of the joint main body 1, annular small protrusions 44 and 45 are projected on the base end 18 side of the male screw 36 with a predetermined interval in the axial center L direction. Surfaces on the base end 18 side of the protrusions 44 and 45 are formed in a direction orthogonal to the axis L to form a first small step portion 41 and a second small step portion 42 (see FIGS. 8 and 9). Moreover, the taper part is formed in the one end 17 side of the annular small protrusions 44 and 45 so that it may expand to the base end 18 side (refer FIG. 8, FIG. 9), and the cap nut 2 is made to the base end 18 direction. When the screw is advanced, a small protrusion 21 of the cap nut 2 described later smoothly gets over each tapered portion. The one end 17 is a part on the pipe insertion port 35 side of the joint body 1, and the base end 18 is a part opposite to the one end 17 with respect to the axis L.
Further, the joint main body 1 is exemplified by a socket type in which a male screw 37 that is screwed to a female screw of a pipe or a joint (not shown) is provided on the outer peripheral surface of the base end 18.
Further, the inner peripheral surface 10 of the joint body 1 is in order from the one end 17 to the base end 18 side through a holding peripheral surface portion 14 into which a later-described spacer 3 is fitted, and from the holding peripheral surface portion 14 through the first step portion 11. It has an intermediate peripheral surface portion 16 that is long and straight in the direction of the axis L, and a pipe insertion peripheral surface portion 19 that is formed from the intermediate peripheral surface portion 16 through the second step portion 12. Further, the inner peripheral surface 10 has a flow path 38 penetrating from the peripheral surface portion 19 for pipe insertion through the pipe abutting step portion to the base end 18 side.
The predetermined interval P is a bag for deforming a locking ring 5 described later from a free state (a cross-sectional C shape including the shaft center L) to a standing state substantially orthogonal to the shaft center L. The length (distance) in the axis L direction in which the nut 2 is screwed in the axis L direction is set equal (see FIGS. 2 and 3).

  Next, as shown in FIG. 1 to FIG. 3 and FIG. 6, the cap nut 2 has a female screw 26 that is screwed onto the male screw 36 of the joint body 1 close to one end (rear end) of the inner peripheral surface 24. And an inner flange 22 with a pipe insertion opening 25 at one end. An inner side surface (base end surface) 23 of the inner flange portion 22 is formed in a flat shape perpendicular to the axis L direction. In addition, the cap nut 2 has a small protrusion 21 for locking the first and second small step portions 41 and 42 of the joint body 1 in the end 20 on the joint body 1 side (base end side). It has a bowl shape (see FIGS. 8 and 9).

  Further, as shown in FIGS. 1 to 3 and FIG. 7, the first O ring 6, the flat washer-shaped intermediate spacer 7, and the second O ring 8 are sequentially fitted in the intermediate peripheral surface portion 16 of the joint body 1. In addition, the short columnar spacer 3 is fitted to the holding peripheral surface portion 14 so as to contact the first stepped portion 11. In other words, the inner surface (base end surface) 31 of the spacer 3 fitted to the holding peripheral surface portion 14 of the joint body 1 and the second step portion 12 and the intermediate peripheral surface portion 16 of the joint body 1 are long in the direction of the axis L. A concave groove 13 is formed, and the first O-ring 6, the intermediate spacer 7, and the second O-ring 8 are sequentially fitted into the concave groove 13. The spacer 3 is made of a steel material or the like, and has an inner side surface 31. The dimension of the axial center L direction is the same as the length of the holding peripheral surface portion 14 in the axial center L direction, A receiving surface 30 is provided. The two O-rings 6 and 8 have the same shape.

As shown in FIGS. 1 and 2, between the spacer 3 and the inner flange portion 22 of the cap nut 2, a locking ring 5 that is secured to the outer peripheral surface 9 a of the pipe 9 is received by the spacer 3. The surface 30 and the inner side surface 23 of the inner flange portion 22 are disposed in contact with each other.
The locking ring 5 has a cross-sectional shape including the shaft center L in a state where the cap nut 2 is not tightened (free), and has a square shape with respect to the direction of the shaft center L (see FIGS. ) So to speak, it is a disc spring shape. In the state before the cap nut 2 is screwed (see FIGS. 1 and 2), the locking ring 5 is reduced in diameter from one end side to the base end side between the spacer 3 and the inner flange portion 22 of the cap nut 2. The front peripheral edge (small-diameter peripheral edge) 52 of the locking ring 5 is in contact with the receiving surface 30 of the spacer 3, and the rear peripheral peripheral edge (large-diameter peripheral edge) 53 is It is in contact with the inner side surface 23 of the inner flange 22.
And in the state which the small protrusion 21 of the cap nut 2 latched to the 1st small level | step-difference part 41, the ring 5 for latching is kept in the C shape (refer FIG.1, FIG.2, FIG.8), and In the state in which the small protrusion 21 is locked to the second small step portion 42 by the screw nut 2 being screwed, the locking ring 5 serves to prevent the standing deformation substantially perpendicular to the axis L (FIG. 3). , FIG. 7 and FIG. 9).

  The inner diameter of the intermediate spacer 7, the locking ring 5 in the free state, the spacer 3, the intermediate spacer 7, the pipe insertion peripheral surface portion 19 of the joint body 1, and the pipe insertion port 25 of the cap nut 2 is as follows. Corresponding to the outer diameter dimension of the pipe 9, it is set to a slightly larger dimension.

The pipe joint of the present invention is set in the state shown in FIG. 1 before pipe connection work (from factory shipment to pipe connection site). That is, the first O-ring 6, the intermediate spacer 7, and the second O-ring 8 are sequentially fitted in the intermediate peripheral surface portion 16 of the joint body 1, and the holding peripheral surface portion 14 so that the spacer 3 contacts the first stepped portion 11. Is fitted. Then, with the locking ring 5 sandwiched between the spacer 3 and the inner flange portion 22 of the cap nut 2, the female screw 26 of the cap nut 2 is screwed to the male screw 36 of the joint body 1 to the middle, The small protrusion 21 of the cap nut 2 is locked to the first small step portion 41 of the joint body 1. Since the cap nut 2 is not screwed out of the joint body 1 by this locking, the pipe joint is kept in the state shown in FIG.
Thus, in the joint body 1, the intermediate spacer 7 sandwiched between the two O-rings 6 and 8 and the spacer 3 each have a concave groove for accommodating the two O-rings 6 and 8, respectively. Can be formed. Moreover, the first O-ring 6, the intermediate spacer 7, the second O-ring 8, and the spacer 3 can be set in the inner peripheral surface 10 of the joint main body 1 by being sequentially fitted. Further, since the cap nut 2 is not screwed to one end side, the spacer 3 does not come off to the one end side from the position where the spacer 3 is fitted to the holding peripheral surface portion 14 of the joint body 1, and the ring 6, 8 is inserted into the concave circumferential groove 13. And the state which fitted the intermediate spacer 7 can be hold | maintained. On the other hand, when two concave grooves having a small width (for storing two O-rings) are cut on the inner peripheral surface 10 of the joint main body 1, the work is very difficult. In addition, the work of fitting the O-ring into the recessed groove processed in the joint body 1 while taking the time is troublesome. According to the pipe joint of the present invention, these problems are solved.

Next, the usage method and operation of the pipe joint according to the present invention will be described.
As described above, the pipe joint before the pipe connection work is in the state shown in FIGS. 1 and 8, and the pipe 9 is inserted from the pipe insertion port 25 of the cap nut 2 of this pipe joint, as shown in FIG. Then, the joint body 1 is inserted until it comes into contact with the pipe abutting step at the back of the pipe insertion peripheral surface portion 19. At this time, the two O-rings 6 and 8 are pressed against the outer peripheral surface 9a of the pipe 9 and elastically deformed.
Next, when the cap nut 2 is screwed into the male thread 36 of the joint body 1 from the state of FIG. 2, the locking ring 5 is pressed toward the proximal end side in the axial center L direction by the inner flange portion 22. It will be deformed in a direction that rises almost perpendicularly.

This modification will be described. Since the locking ring 5 is fitted on the inner peripheral surface 24 of the cap nut 2, the outer diameter D ₅₁ of the outer peripheral edge ₅₁ is constant during the deformation process (FIGS. 2, 3, 5, and 5). 7 refer), the inner peripheral edge 50, in contact with the fixed portion 39 of the outer peripheral surface 9a of the pipe 9, will bite into the outer peripheral surface 9a of the pipe 9 that the inner diameter D ₅₀ is reduced in diameter.
Then, as shown in FIGS. 3, 7, and 9, if the small protrusion 21 of the cap nut 2 is screwed until it is locked to the second small step portion 42 of the joint body 1, the pipe 9 is connected to the pipe joint. Connection is complete. At this time, on the outer peripheral surface 9 a of the pipe 9, the inner peripheral edge 50 of the locking ring 5 is approximately half the difference between the inner diameter dimension D ₅₀ before and after the cap nut 2 is screwed. I ’m eating. Thus, the inner peripheral edge 50 is bitten into the outer peripheral surface 9a of the pipe 9 by the difference in inner and outer diameters of the locking ring 5 to prevent the pipe from being removed.
More specifically, as shown in the simplified view of FIG. 11, the locking ring 5 (in a free state) before the cap nut 2 is screwed has a longitudinal dimension X of a cross-sectional shape including the axis L, which is a solid line. As shown in Fig. 4, the length is close to the diagonal of the quadrilateral cross section formed by the receiving surface 30 of the spacer 3, the inner surface 23 of the cap nut 2, the inner peripheral surface 24, and the outer peripheral surface 9a of the pipe 9. ) Dimensions.
When the cap nut 2 is screwed, the locking ring 5 is deformed in a direction substantially orthogonal to the axis L. Even if the cap nut 2 is screwed, the inner peripheral surface 24 of the cap nut 2 and the pipe 9 Since the distance dimension Y of the locking ring 5 remains constant, the longitudinal dimension X of the locking ring 5 is forcibly reduced to the distance dimension Y, and the locking ring 5 is indicated by a two-dot chain line. The inner peripheral edge 50 bites into the outer peripheral surface 9 a of the pipe 9. Thus, the locking ring 5 is bitten into the pipe 9 by utilizing the difference between the cross-sectional longitudinal dimension X of the locking ring 5 and the distance Y between the inner peripheral surface 24 of the cap nut 2 and the pipe 9. (Or create an edge E).

In FIG. 7, the locking ring 5 is erected and deformed substantially orthogonally to the axis L and deformed into a small bow shape, and its inner peripheral edge 50 is press-fitted into the outer peripheral surface 9 a of the pipe 9 (outer peripheral surface). Crushing) to obtain pipe pulling resistance. By the way, in FIG. 1 to FIG. 3, FIG. 5A and FIG. 7, the inner peripheral edge 50 of the disc spring-like locking ring 5 intersects the axis L with an inclination angle θ in the cross section. That is, the cross-sectional shape is inclined in the shape of a letter C with an inclination angle β, but the inner peripheral edge 50 is inclined at an inclination angle of θ = (90 ° −β). Easy.
On the other hand, as shown in FIGS. 5B and 10, the retaining ring 5 is deformed (elastically) into a small bow shape in the retaining state, and its inner peripheral edge 50 is connected to the outer periphery of the pipe 9. It is also preferable that the edge E is made to bite into the surface 9a. That is, if the inner peripheral edge 50 is formed in a triangular mountain shape in the cross section as shown in FIG. 5B and tightened as shown in FIGS. 1 to 2 and FIG. 3, as shown in FIG. Deeply bite into the outer peripheral surface 9 a of the pipe 9.

  Further, as described above, since the two O-rings 6 and 8 are pressed against the outer peripheral surface 9a of the pipe 9 and sealed, fluid leakage is reliably prevented. Further, since the small protrusion 21 of the cap nut 2 is engaged with the second small step portion 42 of the joint body 1, the cap nut 2 is not screwed out, and the connection once completed is not loosened. When the pipe is connected, it is only necessary to insert the pipe 9 into the pipe insertion port 25 of the cap nut 2 as it is, and the working efficiency is improved.

Further, as shown in FIG. 7 or FIG. 10, the locking ring 5 is completely orthogonal to the shaft center L when the pipe is held between the spacer 3 and the inner flange portion 22 of the cap nut 2. The inner peripheral edge and the outer peripheral edge intermediate portion are not in the form of a small bow with a small bulge toward the base end (elastically deformed), and the inner peripheral edge 50 is the outer peripheral surface 9 a of the pipe 9. Since it bites into the press-fit state or bites into the edge E, the pipe 9 is further prevented from being pulled out against the pulling force in the direction of the arrow 27 on the pipe 9.
In the illustrated embodiment, the case of the socket type is illustrated, but other than this, the one having the above-described configuration such as the cap nut 2, the locking ring 5, the spacer 3 or the like at both ends, or the T-shaped joint It is possible to freely change the design, such as one having the above-described three configurations at the end.

As described above, in the pipe joint according to the present invention, the locking ring 5 having a cross-sectional shape including the shaft center L is raised substantially perpendicularly to the shaft center L by the screwing of the cap nut 2. By deforming, the inner peripheral edge 50 of the locking ring 5 is made to bite into the outer peripheral surface 9a of the pipe 9 to prevent the pipe from being removed. Since the locking ring 5 gives a strong pulling prevention force to the pipe 9 after the screwing, the pipe 9 is not easily pulled out even if it receives a force in the pulling direction. Further, the frictional resistance when the cap nut 2 is screwed is small, and the retaining ring 5 can be firmly retained by being raised and deformed.
In this way, the inner peripheral edge 50 of the locking ring 5 can be bitten into the outer peripheral surface 9a of the pipe 9 simply by screwing the cap nut 2 with a small rotational torque. Can do.

Moreover, the pipe joint according to the present invention includes a spacer 3 having a joint body 1 and a cap nut 2 and having a receiving surface 30 orthogonal to an axis L attached to one end 17 of the joint body 1. In addition, when the cap nut 2 is not tightened, the cross-sectional shape including the shaft center L has a C-shaped locking ring 5, and the cap nut 2 is screwed into the male thread 36 of the joint body 1. The retaining ring 5 is erected and deformed substantially perpendicularly to the axis L at the receiving surface 30 and the inner flange portion 22 of the cap nut 2, so that the inner peripheral edge 50 of the retaining ring 5 is changed to the outer periphery of the pipe 9. Since the pipe 9 is configured to bite into the surface 9a to prevent the pipe from being pulled out, the locking ring 5 imparts a strong pulling prevention force to the pipe 9 after the cap nut 2 is screwed, although the structure is simple. The pipe 9 is not easily pulled out even if it receives a force in the pulling direction. Further, the frictional resistance when the cap nut 2 is screwed is small, and the retaining ring 5 can be firmly retained by being raised and deformed.
In this way, the inner peripheral edge 50 of the locking ring 5 can be bitten into the outer peripheral surface 9a of the pipe 9 simply by screwing the cap nut 2 with a small rotational torque (lightly). Can be done.
Since both the spacer 3 and the cap nut 2 are deformed by pressing the locking ring 5 with the receiving surface 30 orthogonal to the axis L direction and the inner side surface 23 of the inner flange portion 22, The ring 5 can be deformed upright in the axial center L direction. Therefore, the depth of biting into the outer peripheral surface 9a of the pipe 9 is not biased, and it is possible to strongly prevent the removal.

  The joint body 1 has a first step portion 11 near the one end 17 and a second step portion 12 on the back side on the inner peripheral surface 10, and the spacer 3 is fitted so as to contact the first step portion 11. Then, a concave circumferential groove 13 that is long in the axial center L direction is formed between the inner surface 31 of the spacer 3 and the second stepped portion 12, and the first O-ring 6 and the flat washer-shaped intermediate spacer 7 are formed in the concave circumferential groove 13. And the second O-ring 8 are sequentially fitted and the two O-rings 6 and 8 are pressed against the outer peripheral surface 9a of the pipe 9 and sealed, so that the two O-rings 6 and 8 are connected to the pipe 9 By being brought into pressure contact with the outer peripheral surface 9a, leakage can be reliably prevented. Further, in the joint body 1, the intermediate spacer 7 sandwiched between the two O-rings 6 and 8 and the spacer 3 form a concave groove for storing the two O-rings 6 and 8, respectively. be able to. Therefore, the difficult work of cutting the two concave grooves having a small width (for storing two O-rings respectively) on the inner peripheral surface 10 of the joint body 1 is unnecessary. Manufacturing becomes easy and mass production becomes possible. In addition, since the first O-ring 6, the intermediate spacer 7, the second O-ring 8, and the spacer 3 can be set in the inner peripheral surface 10 of the joint body 1 in this order, the O-ring is fitted into the concave groove while being contracted. No work is required, and the coupling body 1 can be set quickly.

Further, the cap nut 2 has a small protrusion 21 for locking at the end 20 on the joint body 1 side, and the joint body 1 has a small protrusion with a predetermined interval P in the axis L direction. 21 is provided with first and second small step portions 41 and 42 that are detachably locked to 21, and when the small protrusion 21 of the cap nut 2 is locked to the first small step portion 41, the locking ring 5 However, when the small protrusion 21 is held in the second small step portion 42 while maintaining the letter C shape, the locking ring 5 is in a state of being prevented from standing-up deformation substantially perpendicular to the axis L. Therefore, before the connection work (before the cap nut 2 is screwed), the cap nut 2 is not screwed out of the joint body 1. Therefore, it can be kept in the set state before the connection work, so that each component is not disassembled and is not lost. In addition, it is only necessary to insert the pipe 9 as it is, and it is not necessary to combine parts on site, so that the working time can be shortened.
In addition, after the cap nut 2 is completely tightened (screwed) and the small protrusion 21 is locked to the second small step portion 42, the cap nut 2 is not screwed out, so that the connection once completed may be loosened. In addition, the connection of the pipe 9 is further strengthened.

  Further, in the retaining state in which the locking ring 5 is sandwiched between the spacer 3 and the inner flange portion 22 of the cap nut 2 and is erected and deformed so as to be substantially orthogonal to the shaft center L, the locking ring 5 has a small bow shape. The inner peripheral edge 50 of the pipe 9 is press-fitted into the outer peripheral surface 9a of the pipe 9 (see FIG. 7), or the edge E is set up (see FIG. 10). Therefore, it is more strongly prevented from pulling out against the pulling force to the pipe 9.

It is a section side view showing one embodiment of a pipe joint concerning the present invention. It is a cross-sectional side view which shows the state which connected the pipe. It is a cross-sectional side view which shows the state which tightened the cap nut. It is a cross-sectional side view which shows a coupling main body. It is a cross-sectional side view which shows a locking ring, Comprising: (a) is a cross-sectional side view which shows the locking ring which has an inner peripheral end surface of one shape, (b) has an inner peripheral end surface of another shape. It is a cross-sectional side view which shows the ring for latching. It is a cross-sectional side view which shows a cap nut. It is a principal part sectional side view. It is a principal part sectional side view. It is a principal part sectional side view. It is a principal part cross-sectional side view which shows another specific example. It is a simplified diagram explaining the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint body 2 Cap nut 3 Spacer 5 Locking ring 6 1st O-ring 7 Intermediate spacer 8 2nd O-ring 9 Pipe 9a Outer peripheral surface
10 Inner surface
11 First step
12 Second step
13 Concave groove
17 One end
20 edge
21 Small protrusion
22 Inner buttock
30 Reception surface
36 Male thread
41 First small step
42 Second small step
50 Inner edge E Edge L Axis center P Predetermined interval

Claims (5)

  By locking the cap nut (2), the locking ring (5) having a cross-sectional shape including the shaft center (L) is raised and deformed substantially perpendicularly to the shaft center (L). A pipe joint characterized in that the inner peripheral edge (50) of the locking ring (5) is bitten into the outer peripheral surface (9a) of the pipe (9) to prevent the pipe from being removed.   A spacer having a joint body (1) and a cap nut (2), and having a receiving surface (30) orthogonal to an axis (L) attached to one end (17) side of the joint body (1) ( 3) and a locking ring (5) having a cross-sectional shape including a shaft (L) when the cap nut (2) is not tightened, and the cap nut (2 ) To the male screw (36) of the joint body (1), the locking ring (5) is formed between the receiving surface (30) and the inner flange (22) of the cap nut (2). Is caused to erect into the outer peripheral surface (9a) of the pipe (9) by causing the inner peripheral edge (50) of the locking ring (5) to bite into the pipe (9). A pipe joint characterized by being configured to prevent slipping.   The joint body (1) has a first step portion (11) near the one end (17) and a second step portion (12) on the back side on the inner peripheral surface (10), and the spacer (3) Is fitted in contact with the first stepped portion (11), and the axial center (L) direction is interposed between the inner surface (31) of the spacer (3) and the second stepped portion (12). A long concave circumferential groove (13) is formed, and a first O-ring (6), a flat washer-shaped intermediate spacer (7) and a second O-ring (8) are sequentially fitted into the concave circumferential groove (13), The pipe joint according to claim 2, wherein the two O-rings (6), (8) are sealed by being brought into pressure contact with the outer peripheral surface (9a) of the pipe (9).   The cap nut (2) has a small protrusion (21) for locking at the end (20) on the joint body (1) side, and the joint body (1) First and second small step portions (41) and (42) that are detachably locked to the small protrusions (21) at a predetermined interval (P) in the axial center (L) direction, In the state where the small protrusion (21) of 2) is locked to the first small step portion (41), the locking ring (5) maintains the square shape and the small protrusion In a state where (21) is locked to the second small step portion (42), the locking ring (5) corresponds to the retaining state of the standing deformation substantially perpendicular to the axis (L). The pipe joint according to claim 2 or 3.   A retaining state in which the locking ring (5) is sandwiched between the spacer (3) and the inner flange (22) of the cap nut (2) and is erected and deformed substantially perpendicularly to the shaft center (L). In this case, the locking ring (5) is deformed into a small bow shape so that its inner peripheral edge (50) bites into the outer peripheral surface (9a) of the pipe (9) in a press-fit manner, or The pipe joint according to 1, 2, 3 or 4, which is configured to bite the edge (E).

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