JP6662099B2 - Pipe fittings - Google Patents

Description

  The present invention relates to a pipe joint.

  Conventionally, pipe joints for connecting pipes are known. Some pipe joints include a collet ring for preventing a pipe connected to the pipe joint from coming off. For example, Patent Literature 1 discloses a pipe joint in which a collet ring is positioned by contacting a first end of a collet ring with a joint body and a second end of the collet ring with a cap. .

EP-A-2273176

  The present invention has been made in view of such a background, and provides a pipe joint including a novel collet ring.

  A pipe joint according to one aspect of the present invention includes an inner cylindrical portion in which a pipe is externally fitted, an outer cylindrical portion forming an insertion space in which the pipe is inserted and arranged between the inner cylindrical portion, and an insertion space. And a collet ring arranged in the collet. On the inner peripheral surface of the outer cylinder portion, a tapered surface having a smaller diameter is formed toward the insertion port side where the pipe is inserted into the insertion space. When a force is applied to the pipe inserted inside the collet ring in the insertion space and a pulling direction opposite to the pipe insertion direction acts on the pipe joint, the collet ring moves to the insertion port side together with the pipe. Then, one end of the collet ring in the axial direction abuts on the tapered surface, and one end of the collet ring is reduced in diameter to tighten the outer peripheral surface of the pipe. A positioning step portion having a large diameter on the insertion port side is formed on the inner peripheral surface of the outer cylinder portion. An outer cut-and-raised portion protruding radially outward of the collet ring is formed in the collet ring. The outer cut-and-raised portion is configured to come into contact with the positioning step portion from the insertion port side.

  According to such a configuration, the collet ring can be accurately and easily positioned in the insertion space of the pipe joint. Also, by changing the position of the positioning step formed on the inner peripheral surface of the outer cylinder, the collet ring can be positioned at a desired position in the insertion space. In addition, by positioning the collet ring in the insertion space, the effect of preventing the pipe from coming off due to the collet ring can be enhanced.

  In the above-mentioned pipe joint, the collet ring is formed with an inner projection projecting inward in the radial direction of the collet ring, and the inner projection projects into the outer peripheral surface of the pipe inserted inside the collet ring in the insertion space. May be configured. According to such a configuration, when a force is applied to the pipe inserted inside the collet ring in the insertion space in the pull-out direction of the pipe, the collet ring moves to the insertion port side together with the pipe. The performance (the mobility of the collet ring following the pipe) can be improved.

  Further, a plurality of outer cut-and-raised portions and inner protrusions may be formed on the collet ring, and the outer cut-and-raised portions and the inner protrusions may be alternately arranged along the circumferential direction of the collet ring. According to such a configuration, it is possible to achieve both the stability of the positioning of the collet ring by the outer cut-and-raised portion and the balance between the inner protrusion and the bite into the outer peripheral surface of the pipe.

It is sectional explanatory drawing which shows the structure of the pipe joint of one Embodiment. It is sectional explanatory drawing which shows the state which connected the pipe to the pipe joint of one Embodiment. It is a perspective view which shows a collet ring. It is a top view showing the 1st end side of a collet ring. It is a side view which shows a collet ring. It is a top view showing the 2nd end side of a collet ring. FIG. 7 is a sectional view taken along line VII-VII of FIG. 4.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the pipe joint 1 is a joint to which a pipe 8 is connected. The pipe joint 1 is used by being arranged between a device such as a water stopcock (not shown) and a pipe 8. The pipe joint 1 includes an inner cylinder part 2, an outer cylinder part 3, a collet ring 4, and the like.

  The inner cylinder part 2 is formed in a cylindrical shape. The inner cylinder 2 is made of a metal such as bronze. A flow path 20 through which a fluid flows is formed in the inner cylindrical portion 2. The inner cylinder part 2 has an inner cylinder small diameter part 21 and an inner cylinder large diameter part 22 having an outer diameter larger than the inner cylinder small diameter part 21.

  The inner cylinder small diameter portion 21 constitutes one end of the inner cylinder 2 in the axial direction (the end on the pipe connection side). The inner cylinder small-diameter portion 21 is a portion where the pipe 8 connected to the pipe joint 1 is externally fitted (a portion inserted inside the pipe 8). On the outer peripheral surface of the inner cylinder small diameter portion 21, two concave grooves 211 formed to be depressed in the radial direction are provided along the circumferential direction. An annular seal member 23 is mounted in each of the two concave grooves 211. The two seal members 23 are members that seal (seal) between the small diameter portion 21 of the inner cylinder and the pipe 8.

  The inner cylinder large diameter portion 22 constitutes the other end of the inner cylinder portion 2 in the axial direction (a portion other than the inner cylinder small diameter portion 21). Between the outer peripheral surface of the inner cylinder large diameter portion 22 and the outer peripheral surface of the inner cylinder small diameter portion 21 is a surface orthogonal to the axial direction of the inner cylinder portion 2 and has an annular contact with which an insertion guide 5 described later contacts. A surface 221 is formed.

  An engagement protrusion 222 is provided on the outer peripheral surface of one end in the axial direction (the end on the pipe connection side) of the inner cylinder large-diameter portion 22 along the circumferential direction. The engagement projection 222 is formed to protrude radially from the outer peripheral surface of the large diameter portion 22 of the inner cylinder. The engagement convex portion 222 is engaged with an engagement concave portion 32 of the outer cylindrical portion 3 described later. Note that the number of the engagement protrusions 222 and the engagement recesses 32 may be one as in the present embodiment, or may be more than one.

  A male screw 223 is formed on the outer peripheral surface of the other end in the axial direction of the inner cylinder large diameter portion 22. The male screw 223 is a part that is screwed into a female screw formed on a device such as a water stopcock (not shown).

  The inner cylinder large diameter portion 22 is provided with a hexagonal protrusion 224 formed to protrude in the radial direction. The protrusion 224 is provided at a position between the engagement protrusion 222 and the male screw 223.

  The outer cylinder 3 is formed in a cylindrical shape. The outer cylinder 3 is made of a synthetic resin such as polyamide, polyphenylsulfone, and polycarbonate. The outer cylindrical portion 3 is made of a synthetic resin having transparency so that it can be visually confirmed that the pipe 8 connected to the pipe joint 1 is inserted into an insertion space 10 described later.

An insertion port 11 for inserting a pipe 8 connected to the pipe joint 1 is formed at one end in the axial direction of the outer cylindrical portion 3 (the end on the pipe connection side).
A first tapered surface 31 is formed on the inner peripheral surface of one end portion (end portion on the pipe connection side) of the outer cylindrical portion 3 so that the inner diameter gradually decreases toward the insertion port 11. Have been.

  An engagement recess 32 is provided along the circumferential direction on the inner peripheral surface of the other end of the outer cylinder portion 3 in the axial direction. The engagement recess 32 is formed so as to be depressed in the radial direction from the inner peripheral surface of the outer cylindrical portion 3. The engagement recess 32 is engaged with the engagement protrusion 222 of the inner cylinder large-diameter portion 22 of the inner cylinder 2. Thereby, the outer cylinder part 3 is assembled to the inner cylinder part 2. In a state where the outer cylinder 3 is assembled to the inner cylinder 2, an annular insertion space 10 into which the pipe 8 is inserted is provided between the inner cylinder small-diameter portion 21 of the inner cylinder 2 and the outer cylinder 3. Is formed.

  On the inner peripheral surface of the outer cylinder portion 3, a positioning step portion 33 formed so that the insertion port 11 side has a large diameter is provided. The positioning step 33 is provided at a position between the first tapered surface 31 and the engagement recess 32. An outer cut-out portion 43 of the collet ring 4, which will be described later, is in axial contact with the positioning step portion 33 from the insertion port 11 side.

  On the inner peripheral surface of the outer cylindrical portion 3, there is formed a recessed portion 34 which is formed to be depressed in the radial direction and accommodates a cut-out portion 43 of the collet ring 4 which will be described later. The housing recess 34 is provided on the insertion port 11 side of the positioning step 33. A second tapered surface 341 is formed on the inner wall surface of the housing recess 34 so that the inner diameter gradually decreases toward the insertion port 11.

  An annular insertion guide 5 for guiding the pipe 8 inserted into the insertion space 10 is arranged in the insertion space 10. The insertion guide 5 is arranged inside the first tapered surface 31 of the outer cylindrical portion 3. The insertion guide 5 is arranged closer to the insertion port 11 than the collet ring 4 described later. The insertion guide 5 is made of a synthetic resin such as polypropylene, polyacetal, polyphenylene sulfide, polyphenylene amide, and polyamide. The insertion guide 5 is colored red or fluorescent so as to stand out with respect to the white pipe 8 or the inner cylinder portion 2 and the collet ring 4 which are metal material colors.

  In the insertion space 10, an annular collet ring 4 for preventing the pipe 8 inserted in the insertion space 10 from coming off is arranged. The collet ring 4 is made of a metal such as a synthetic resin or stainless steel. The collet ring 4 is arranged along the inner peripheral surface of the outer cylinder portion 3 with an interval provided between the collet ring 4 and the inner cylinder small-diameter portion 21 of the inner cylinder portion 2.

  As shown in FIGS. 3 to 7, a plurality of (in the present embodiment, ten) folded portions 42 are provided at a first end 401, which is one end in the axial direction of the collet ring 4. The plurality of folded portions 42 are arranged at equal intervals along the circumferential direction. Each folded portion 42 is formed so as to be folded inside the main body tube 41 from the first end 411 which is one end of the cylindrical main body tube 41 toward the second end 412 which is the other end. I have. A cut 421 is formed between the folded portions 42 along the axial direction from the first end 411 of the main body tubular portion 41.

  A plurality (five in the present embodiment) of outer cut-and-raised portions 43 are provided at a second end 402 which is the other end in the axial direction of the collet ring 4. The plurality of outer cut-out portions 43 are arranged at equal intervals along the circumferential direction. Each outer cut-and-raised portion 43 is a convex portion directed outward in the radial direction, and in the present embodiment, is formed by subjecting the main body tubular portion 41 to a cut-and-raised process. Specifically, each outer cut-and-raised portion 43 is formed by bending (cut-raising) a part of the outer cut-and-raised piece 431 formed on the main body tubular portion 41 radially outward. The outer cut-and-raised piece portion 431 extends from the second end 412 of the main body tube portion 41 between two cuts 432 formed along the axial direction, and extends from the second end 412 of the main body tube portion 41. It is comprised by the part which was done. In the present embodiment, the outer cut-out portion 43 is a portion extending from the second end 412 of the main body tubular portion 41. Each outer cut-and-raised portion 43 is formed so as to be inclined with respect to the axial direction of the main body tubular portion 41.

  The second end 402 of the collet ring 4 is provided with a plurality (five in the present embodiment) of inner protrusions 44. The plurality of inner protrusions 44 are arranged at equal intervals along the circumferential direction. Each of the inner projections 44 is formed by bending a portion extending from the second end 412 of the main body cylinder 41 radially inward. Each inner projection 44 is formed so as to be inclined with respect to the axial direction of the main body cylinder 41.

  In the collet ring 4, the outer cut-and-raised portions 43 and the inner protruding portions 44 are alternately arranged along the circumferential direction. That is, one inner protruding portion 43 is disposed between adjacent outer raised portions 43, and one outer protruded portion 43 is disposed between adjacent inner protruding portions 44.

  As shown in FIGS. 1 and 2, when connecting the pipe 8 to the pipe joint 1 having the above configuration, the pipe 8 is inserted into the insertion space 10 of the pipe joint 1. Specifically, when the pipe 8 is inserted from the insertion port 11 of the pipe joint 1 in the insertion direction X <b> 1, the distal end surface of the pipe 8 contacts the insertion guide 5. When the pipe 8 is further inserted in the insertion direction X <b> 1, the pipe 8 is guided by the insertion guide 5 and passes inside the collet ring 4. At this time, since the outer cut-and-raised portion 43 of the collet ring 4 is in contact with the positioning step 33 of the outer tubular portion 3 of the pipe joint 1, the position of the collet ring 4 is sufficiently maintained in the insertion space 10. Is done.

  Thereafter, when the insertion guide 5 comes into contact with the contact surface 221 of the large-diameter portion 22 of the inner cylinder portion 2, the insertion of the pipe 8 into the insertion space 10 of the pipe joint 1 is completed. Here, the collet ring 4 is positioned in the middle of the insertion space 10. That is, there is a distance between the collet ring 4 and the contact surface 221 of the large diameter portion 22 of the inner cylinder 2 of the inner cylinder 2. The outer cylinder 3 is made of a transparent synthetic resin. Therefore, the fact that the pipe 8 is securely inserted into the insertion space 10, that is, the fact that the insertion guide 5 is securely in contact with the contact surface 221 of the inner cylindrical large-diameter portion 22 of the inner cylindrical portion 2, Without being interrupted by the collet ring 4, it can be confirmed from the outside of the pipe joint 1 by the presence of the insertion guide 5 via the outer tubular portion 3.

  As shown in FIG. 2, when the pipe 8 is inserted into the insertion space 10 of the pipe joint 1, the inner protrusion 44 of the collet ring 4 is in a state of being cut into the outer peripheral surface of the pipe 8. Further, the seal member 23 attached to the two concave grooves 211 of the inner cylinder small-diameter portion 21 of the inner cylinder portion 2 includes the pipe joint 1 (specifically, the inner cylinder small-diameter portion 21 of the inner cylinder portion 2) and the pipe 8. Is sealed. The pipe 8 is a resin pipe formed in a cylindrical shape. The pipe 8 is made of a synthetic resin such as a polyolefin (crosslinked polyethylene, polybutene, etc.).

  When the pipe 8 is inserted into the insertion space 10 of the pipe joint 1 (inside the collet ring 4), a force is applied to the pipe 8 in the withdrawal direction X2 opposite to the insertion direction X1 of the pipe 8. When (pulling force) acts, the collet ring 4 moves to the insertion port 11 side together with the pipe 8. At this time, since the inner protrusion 44 of the collet ring 4 bites into the outer peripheral surface of the pipe 8, the collet ring 4 follows the pipe 8 and easily moves to the insertion port 11 side. Further, since the second tapered surface 341 is formed on the outer cylindrical portion 3, the collet ring 4 can be smoothly moved to the insertion port 11 side.

  After that, the first end 401 of the collet ring 4 comes into contact with the first tapered surface 31 of the outer tubular portion 3 of the pipe joint 1, and the first end 401 of the collet ring 4 (the portion where the folded portion 42 is provided). Reduces the diameter and tightens the outer peripheral surface of the pipe 8 from the outside to the inside in the radial direction. Thus, the detachment of the pipe 8 from the pipe joint 1 is suppressed.

Next, the operation and effect of the pipe joint 1 of the present embodiment will be described.
In the pipe joint 1 of the present embodiment, a plurality of outer cut-out portions 43 are formed in the collet ring 4. The plurality of outer cut-and-raised portions 43 are configured to abut against the positioning step portion 33 formed on the inner peripheral surface of the outer cylindrical portion 3 in the axial direction from the insertion port 11 side.

  According to such a configuration, the collet ring 4 can be accurately and easily positioned in the insertion space 10 of the pipe joint 1. In addition, by changing the position of the positioning step 33 formed on the inner peripheral surface of the outer cylinder 3, the collet ring 4 can be positioned at a desired position in the insertion space 10. In addition, by positioning the collet ring 4 in the insertion space 10, the effect of suppressing the detachment of the pipe 8 by the collet ring 4 can be enhanced.

  Further, the collet ring 4 is formed with an inner projection 44 projecting radially inward of the collet ring 4. The inner protrusion 44 is configured to cut into the outer peripheral surface of the pipe 8 inserted inside the collet ring 4 in the insertion space 10. According to such a configuration, when a pull-out force acts on the pipe 8 inserted inside the collet ring 4 in the insertion space 10, the collet ring 4 moves to the insertion port 11 side together with the pipe 8. The performance (the mobility of the collet ring 4 following the pipe 8) can be improved.

  The collet ring 4 has a plurality of outer cut-and-raised portions 43 and inner protrusions 44, and the outer cut-and-raised portions 43 and the inner protrusions 44 are alternately arranged along the circumferential direction of the collet ring 4. Have been. According to such a configuration, the stability of the positioning of the collet ring 4 by the outer cut-and-raised portion 43 and the balance between the inner protrusion 44 and the bite into the outer peripheral surface of the pipe 8 can be compatible.

(Other embodiments)
The present invention is not limited to the above embodiment at all, and it goes without saying that the present invention can be implemented in various modes without departing from the present invention.

(1) The outer cut-and-raised portion 43 of the collet ring 4 may be formed by bending (cut-raising) the entire outer cut-and-raised piece 431 radially outward.
(2) The outer cut-and-raised piece 431 constituting the outer cut-and-raised portion 43 of the collet ring 4 is sandwiched between two cuts 432 formed along the axial direction from the second end 412 of the main body tubular portion 41. It may be composed of only parts.

  (3) The location where the outer cut-and-raised portion 43 is provided in the collet ring 4 can be freely set as long as the positioning of the collet ring 4 by the outer cut-and-raised portion 43 and other functions of the collet ring 4 are not hindered.

(4) The inner projection 44 of the collet ring 4 may be formed by cutting and raising the main body tubular portion 41 in the same manner as the outer cut and raised portion 43.
(5) The functions of one component in the above-described embodiment or the other embodiments may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. . Further, a part of the configuration of the above embodiment or the other embodiments may be omitted. Further, at least a part of the configuration of the above-described embodiment or the other embodiment may be added to or replaced with the configuration of the other embodiment or the other embodiment. It should be noted that all aspects included in the technical idea specified by the language described in the claims, the detailed description of the invention, and the description of the drawings are embodiments of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Pipe joint 10 ... Insert space 11 ... Insertion opening 2 ... Inner cylinder part 21 ... Inner cylinder small diameter part 22 ... Inner cylinder large diameter part 3 ... Outer cylinder part 31 ... 1st taper surface (taper surface)
Reference numeral 33: positioning step portion 4: collet ring 401: first end (one end of the collet ring)
43: outside cut-and-raised portion 44: inside projection 8: pipe

Claims (2)

An inner cylinder portion in which the pipe is externally fitted, an outer cylinder portion forming an insertion space in which the pipe is inserted and arranged between the inner cylinder portion, and a collet ring arranged in the insertion space. A first tapered surface having a smaller diameter toward an insertion port side for inserting the pipe into the insertion space is formed on an inner peripheral surface of the outer cylindrical portion, and an inner side of the collet ring in the insertion space. When a force is applied to the pipe inserted into the pipe in a pulling-out direction opposite to the inserting direction of the pipe, the collet ring moves together with the pipe toward the insertion port side, and a shaft of the collet ring is moved. In a pipe joint, one end in the direction abuts on the first tapered surface, and the one end of the collet ring is reduced in diameter to tighten the outer peripheral surface of the pipe.
On the inner peripheral surface of the outer cylinder portion, a positioning step portion having a large diameter on the insertion port side is formed,
An outer cut-and-raised portion is formed on a portion of the collet ring on a side opposite to the insertion port side, the outer cut-and-raised portion protruding radially outward of the collet ring,
The outer cut-and-raised portion is configured to contact the positioning step from the insertion port side ,
An inner projection that projects radially inward of the collet ring is formed on the opposite portion of the collet ring, and the inner projection is inserted inside the collet ring in the insertion space. Is configured to bite into the outer peripheral surface of the pipe,
A pipe joint , wherein a portion of the inner peripheral surface of the outer cylindrical portion facing the outer cut-and-raised portion is provided with a second tapered surface whose inner diameter gradually decreases toward the insertion port side . In the collet ring, a plurality of the outer cut-and-raised portions and the inner protrusions are respectively formed, and the outer cut-and-raised portions and the inner protrusions are alternately arranged along a circumferential direction of the collet ring. The pipe joint according to claim 1 , wherein

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