JP5461955B2 - Fitting - Google Patents

Description

  The present invention provides an insertion guide that guides the insertion of a pipe in a joint that connects pipe ends in a water supply system or a hot water supply piping system, or a joint that connects an end of a pipe and a faucet device, for example. The present invention relates to a joint that enables tilting and suppresses damage to a seal member.

  Conventionally, as this type of joint, for example, the following pipe joint has been proposed (see Patent Document 1). This pipe joint has an inner cylinder part projecting from the main body part, and an outer cylinder part formed concentrically at an interval so as to form an insertion part of the connection pipe on the outer peripheral side of the inner cylinder part. A foreign matter intrusion prevention member that closes the opening for inserting the connecting pipe is mounted. When the connection tube is inserted into the opening for inserting the connection tube, the foreign matter intrusion prevention member is pushed into the insertion portion by the tip. By this foreign matter intrusion preventing member, foreign matter is prevented from entering the insertion portion of the connecting pipe, and the pipe connection workability is improved.

Japanese Patent No. 4205153 (pages 1 to 3)

  However, in the conventional pipe joint described in Patent Document 1, the foreign matter intrusion prevention member (insertion guide) is formed in a cylindrical shape, and the outer peripheral surface and the inner peripheral surface thereof are flat surfaces. When the member moves in the pipe joint, the sliding contact resistance with respect to the outer cylinder part and the inner cylinder part is large. By the way, the connecting pipe connected to the pipe joint is used with its end cut off, but the cut surface is not necessarily formed in a direction orthogonal to the axial direction of the connecting pipe, but is formed in an oblique direction. There is a case.

  Therefore, when the connecting pipe is inserted into the pipe joint, the distal end portion of the oblique cut surface presses the foreign matter intrusion preventing member and moves the foreign matter intrusion preventing member. On the other hand, since the foreign matter intrusion prevention member is formed of foamed urethane having high elasticity, the foreign matter intrusion prevention member moves while being compressed and deformed. However, when a hard connecting pipe is strongly inserted into the pipe joint, the foreign matter intrusion prevention member is abnormally deformed, and a part of the connecting pipe having an oblique cut surface comes into contact with the O-ring as a seal member. It may be damaged. In addition, there is a problem that the foreign matter intrusion prevention member itself may be damaged by the tip surface of the connecting pipe.

  Therefore, an object of the present invention is to provide a joint that uses a rigid insertion guide, enables tilting of the insertion guide when the pipe is inserted, and can suppress damage to the seal member. .

In order to achieve the above object, a joint of the invention according to claim 1 includes a joint body to which a pipe is inserted and connected, an inner cylinder portion protruding from the joint body, and an outer periphery of the inner cylinder portion. An outer cylinder part provided so as to form an insertion space for the pipe, a seal member fitted in a concave groove provided on the outer peripheral surface of the inner cylinder part to stop water in contact with the pipe, and the pipe And an insertion guide that guides the pipe by being pressed by the distal end portion. The insertion guide has rigidity, the contact area of the outer peripheral portion with respect to the inner peripheral surface of the outer cylinder portion is set to be smaller than the contact area of the inner peripheral portion with respect to the seal member, and the insertion guide is connected to the pipe. While being configured to be able to tilt following the tip shape , the insertion guide is formed in a symmetric shape .

  According to a second aspect of the present invention, there is provided the joint according to the first aspect, wherein the outer peripheral portion of the insertion guide is configured to be in point contact or line contact with the inner peripheral surface of the outer cylindrical portion, and the inner peripheral portion is a seal member. It is comprised so that a surface contact may be carried out with respect to the outer peripheral surface.

According to a third aspect of the present invention, there is provided the joint according to the second aspect, wherein the outer peripheral portion of the insertion guide is formed by a protruding portion having a cross-sectional mountain shape.
The joint of the invention according to claim 4 is characterized in that, in claim 2 or claim 3, the inner peripheral portion of the insertion guide is formed of a flat surface.

According to a fifth aspect of the joint of the present invention, in any one of the first to fourth aspects, the front end edge and the rear end edge of the inner peripheral portion of the insertion guide are formed in a circular arc shape in cross section. Features .

  In the joint according to the first aspect of the present invention, the insertion guide has rigidity, and the contact area of the outer peripheral portion with respect to the inner peripheral surface of the outer cylinder portion is set to be smaller than the contact area of the inner peripheral portion with respect to the seal member. ing. For this reason, when the pipe with the tip end surface formed obliquely is inserted into the insertion space and hits the insertion guide, the contact resistance of the outer peripheral portion of the insertion guide with respect to the inner peripheral surface of the outer cylinder portion is different from the seal member. Since it is smaller than the contact resistance of the inner peripheral part of the insertion guide, the insertion guide can be tilted following the tip shape of the pipe. Therefore, the insertion guide can guide the insertion of the pipe in the tilted state.

Therefore, according to the joint of the present invention, it is possible to use the rigid insertion guide, to tilt the insertion guide accompanying the insertion of the pipe, and to suppress damage to the seal member.
Furthermore, in the joint according to the first aspect of the present invention, the insertion guide is formed in a symmetric shape. Therefore, even when the insertion guide is installed in the joint in the reverse direction, the same function as the insertion guide can be exhibited, and the assemblability can be improved.

Sectional drawing which is a coupling in embodiment of this invention, Comprising: The coupling of the state before inserting a pipe. (A) is a front view which shows an insertion guide, (b) is a sectional side view which shows the insertion guide. It is a figure for demonstrating the effect | action of a coupling | joint, Comprising: The fragmentary sectional view of a coupling | joint which shows the state which the most front-end | tip part of the front end surface of the pipe contacted the insertion guide. It is a figure for demonstrating the effect | action of a coupling | joint, Comprising: The fragmentary sectional view of the coupling | joint which shows the state in which the whole tip surface of the pipe contacted the insertion guide and the insertion guide inclined. It is a figure for demonstrating the effect | action of a coupling | joint, Comprising: The partial sectional view of a coupling | joint which shows the state by which the pipe and the insertion guide were inserted to the innermost part of insertion space. (A) And (b) is a sectional side view which shows another example of an insertion guide. (A) is a perspective view which shows the further another example of an insertion guide, (b) is a sectional side view which shows the insertion guide.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, a joint main body 11 constituting the joint 10 includes a main body cylinder portion 12, an inner cylinder portion 13 protruding inward in the axial direction x from one end of the main body cylinder portion 12, and the inner cylinder portion. An insertion space 15 for the resin pipe 14 is formed on the outer periphery of the outer peripheral portion 13, and the outer cylindrical portion 17 is screwed and fixed to the outer periphery of the main body cylindrical portion 12 by a screwing portion 16. A male screw 18 is formed on the outer periphery of the other end of the main body cylinder portion 12 so as to be screwed and connected to a faucet device (not shown). A flow hole 19 through which water flows is formed inside the main body cylinder portion 12.

  A male screw portion 20 is formed on the outer peripheral surface of the outer cylindrical portion 17, and a female screw portion 22 on the inner peripheral surface of the cap 21 is screwed to connect the cap 21 to the outer cylindrical portion 17. An opening 23 into which the resin pipe 14 is inserted into the insertion space 15 is provided on the inner periphery of the outer end portion of the cap 21. In addition, a pair of first locking grooves 24 and second locking grooves 25 arranged in the axial direction x of the joint body 11 are recessed in the inner peripheral surface of the outer cylinder portion 17. Each locking groove 24, 25 is formed by a tapered portion 26 formed so as to be deeper toward the outer end side at the inner end side position, and a step portion 27 formed so as to be orthogonal to the axial direction x at the outer end side position. It is configured. In addition, a plurality of viewing windows 28 are provided in the outer cylinder portion 17 so that the inside of the insertion space 15 can be viewed through the viewing windows 28.

  A cover cylinder 29 that is formed of a transparent resin and forms the outer cylinder 17 is slidably disposed on the inner periphery of the outer cylinder 17. The inner end portion of the cover cylinder 29 is an annular locking claw 30 that bends at right angles toward the inner peripheral side, and the outer end portion is a locking protrusion 31 that protrudes obliquely outward toward the outer peripheral side. Then, the resin pipe 14 is inserted into the insertion space 15, and a later-described insertion guide 32 pressed against the tip of the resin pipe 14 abuts on the locking claw 30 of the cover cylinder 29 so that the cover cylinder 29 is inserted into the insertion space 15. It is made to move to the inner back part of 15. In this case, the locking protrusion 31 of the cover cylinder 29 slides along the tapered portion 26 that forms the first locking groove 24 positioned at the outer end of the inner peripheral surface of the outer cylinder portion 17 and is positioned on the inner end side. The second locking groove 25 is entered beyond the stepped portion 27 forming the second locking groove 25, and a sound is generated at that time. It is configured so that it can be confirmed by the sound that the resin pipe 14 has been inserted to a predetermined position in the insertion space 15.

  A retaining ring 33 made of a metal such as stainless steel is interposed between the outer end surface of the outer cylinder portion 17 and the inner peripheral surface of the cap 21. A retaining piece 33a is formed on the inner peripheral portion of the retaining ring 33 so as to project obliquely, and the resin pipe 14 is retained by biting into the outer peripheral portion of the resin pipe 14. A split ring 35 is interposed between the retaining ring 33 and the first inclined surface 34 on the inner periphery of the cap 21 so as to maintain the inclination angle of the retaining piece 33a. A second inclined surface 36 having the same inclination angle as the first inclined surface 34 of the cap 21 is provided at the outer end portion of the split ring 35, and the retaining piece 33 a is pulled by a force applied to the resin pipe 14 in the drawing direction. When the split ring 35 receives a force outward in the axial direction x, the split ring 35 is configured to be reduced in diameter. A tightening surface 37 provided on the inner peripheral surface of the split ring 35 tightens and holds the outer peripheral surface of the resin pipe 14.

  On the inner periphery of the split ring 35, an insertion guide 32 that is pressed by the distal end surface 14a of the resin pipe 14 to guide insertion of the resin pipe 14 is disposed. As shown in FIG. 2A, the insertion guide 32 is provided with a notch 38, is formed in a C-ring shape, and is configured to be expandable / contractable. As shown in FIG. 2B, the insertion guide 32 is formed in a pentagonal cross section, its outer peripheral part is constituted by a projecting part 39 having a cross-sectional mountain shape, and its inner peripheral part is constituted by a flat surface 40. . The insertion guide 32 is set so that the contact area of the outer peripheral portion with respect to the inner peripheral surface of the cover cylinder 29 is smaller than the contact area of the inner peripheral portion with respect to the outer peripheral surface of the seal member 41.

  Since the inner peripheral portion of the insertion guide 32 is composed of the flat surface 40, it comes into surface contact with a seal member 41 which will be described later and exhibits a large contact resistance, and the outer peripheral portion is composed of the protruding portion 39. A small contact resistance is shown by line contact with the inner peripheral surface of the cover cylinder 29. Therefore, when the resin pipe 14 is inserted into the insertion space 15 and hits the insertion guide 32, the outer periphery of the insertion guide 32 is easier to move than the inner periphery thereof, and as a result, the distal end surface 14 a of the resin pipe 14. It can be tilted following the shape.

  On the other hand, the front end surface 14a of the resin pipe 14 is between a front end surface front part 14b (lower part in FIG. 1) located at the most front end and a front end face rear part 14c (upper part in FIG. 1) located at the rearmost end. It is cut straight in the diagonal direction. As the inclination angle of the tip surface 14a, there are inclination angles close to a direction orthogonal to the axial direction x of the resin pipe 14, various inclination angles approaching the axial direction x, or an inclination angle obtained by combining a plurality of inclination angles. . In addition, when the front end surface 14a of the resin pipe 14 is cleanly cut in the direction orthogonal to the axial direction x, the insertion guide 32 does not tilt and moves while maintaining the orthogonal direction to the axial direction x. .

  On the outer peripheral surface of the inner cylindrical portion 13, two large and small first concave grooves 43a and second concave grooves 43b are provided at predetermined intervals in the axial direction x, and the resin pipes 14 are respectively provided in both concave grooves 43a and 43b. A first seal member 41a and a second seal member 41b made of rubber for stopping water in contact with each other are fitted. The first seal member 41a has a flat cross section, the second seal member 41b has a circular cross section, and the two seal members 41a and 41b allow the outer peripheral surface of the inner cylinder portion 13 and the resin pipe 14 to be Improvement of the water stoppage between the inner peripheral surface is achieved.

  As described above, the inner peripheral portion of the insertion guide 32 is configured by the flat surface 40, and the insertion guide 32 can pass through the outer circumferences of the first seal member 41a and the second seal member 41b with a predetermined sliding resistance. It is like that. Further, the front end edge 32a and the rear end edge 32b of the inner peripheral portion of the insertion guide 32 are formed in a circular arc shape, and the insertion guide 32 is in sliding contact without damaging the first seal member 41a and the second seal member 41b. It is configured to be able to. Further, the insertion guide 32 is formed in a symmetrical shape, and is configured so that the same function can be exhibited even when the insertion guide 32 is installed in the insertion space 15 in the reverse direction. ing.

  The outer diameter of the insertion guide 32 is the same as or slightly larger than the outer diameter of the resin pipe 14, and the inner diameter is slightly larger than the outer diameter of the inner cylinder portion 13. A retaining step 44 is provided on the inner peripheral surface of the split ring 35, and the protrusion 39 of the insertion guide 32 is engaged with the retaining step 44 so that the insertion guide 32 is retained. It is like that.

  The joint body 11, the cap 21, the insertion guide 32, the cover cylinder 29, the split ring 35 and the like are formed of a synthetic resin (engineering plastic) having rigidity such as polyacetal (POM) or polyphenylene sulfide (PPS). . The resin pipe 14 is formed of a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.).

Next, the effect | action is demonstrated about the coupling 10 comprised as mentioned above.
When the resin pipe 14 is inserted from the opening 23 of the cap 21 as shown in FIG. 3 from the state before the resin pipe 14 shown in FIG. 1 is inserted into the joint 10, the tip surface 14 a of the resin pipe 14 hits the insertion guide 32. . In this case, since the front end surface 14 a of the resin pipe 14 is cut obliquely, the front end surface front portion 14 b located at the most front end hits the insertion guide 32 and presses the insertion guide 32. At this time, the distal end surface rear portion 14 c located at the rear end of the distal end surface 14 a of the resin pipe 14 does not reach the insertion guide 32.

  Subsequently, as shown in FIG. 4, when the resin pipe 14 is further inserted, the insertion guide 32 reaches the outer peripheral portion of the first seal member 41a. When this position is reached, the inner peripheral portion of the insertion guide 32 is formed by the flat surface 40, so that it comes into surface contact with the first seal member 41a and exhibits a large contact resistance, while the outer peripheral portion is a protrusion having a mountain-shaped cross section. Since it is formed by the shape portion 39, it makes a line contact with the inner peripheral surface of the cover cylinder 29 and exhibits a small contact resistance. Therefore, the insertion guide 32 has an outer peripheral portion that is easier to move than the inner peripheral portion, the outer peripheral portion tilts around the inner peripheral portion, and follows the shape of the distal end surface 14a that is cut obliquely of the resin pipe 14. Inclined easily. That is, in the insertion guide 32, the front end surface front portion 14b side of the resin pipe 14 becomes the inclined front portion 32A, and the front end surface rear portion 14c side of the resin pipe 14 becomes the inclined rear portion 32B.

  Therefore, the entire distal end surface 14a of the resin pipe 14 is in close contact with the insertion guide 32, and the risk of damaging the first seal member 41a and the second seal member 41b by the distal end surface 14a of the resin pipe 14 is avoided. Furthermore, since the front end edge 32a and the rear end edge 32b of the inner peripheral part of the insertion guide 32 are formed in a circular arc shape, the first seal member 41a and the second seal member 41b are damaged by the insertion guide 32 itself. The fear is also avoided.

  Next, as shown in FIG. 5, when the resin pipe 14 is further inserted, the resin pipe 14 is guided forward by the insertion guide 32 while the insertion guide 32 is maintained in an inclined state, and the insertion guide 32 is moved forward. The inclined front portion 32A comes into contact with the locking claw 30 of the cover cylinder 29 and stops, and the insertion of the resin pipe 14 is completed. At this time, the inclined rear portion 32 </ b> B of the insertion guide 32 does not hit the locking claw 30 of the cover cylinder 29.

  In the middle of the operation, the insertion guide 32 and the resin pipe 14 pass through the inner peripheral side of the retaining piece 33a of the retaining ring 33 and also pass through the outer peripheral side of the first seal member 41a and the second seal member 41b. . At this time, since the insertion guide 32 is formed so as to be able to be expanded and contracted by the notch 38, the insertion guide 32 is brought into sliding contact with the retaining piece 33a to gradually increase the diameter of the retaining piece 33a, and at the same time, the insertion guide 32 32 itself is reduced in diameter and passes smoothly. In addition, since the insertion guide 32 is formed so as to be able to be expanded and contracted, its inner peripheral portion is constituted by a flat surface 40, and its front end edge 32a is formed in a cross-sectional arc shape. The first seal member 41a and the second seal member 41b smoothly pass over both the seal members 41a and 41b while expanding or contracting in diameter according to the shape of the second seal member 41b.

The effects exhibited by the above embodiment will be described collectively below.
(1) In the joint 10 of the present embodiment, the outer peripheral portion of the insertion guide 32 is formed so as to be in line contact with the inner peripheral surface of the cover cylinder 29, and the inner peripheral portion is in surface contact with the seal member 41. It is configured. For this reason, when the resin pipe 14 with the inclined front end surface 14 a is inserted into the insertion space 15 and hits the insertion guide 32, the insertion guide 32 tilts following the shape of the front end surface 14 a of the resin pipe 14. be able to. Therefore, the insertion guide 32 can guide the insertion of the resin pipe 14 in an inclined state in which the distal end surface 14a of the resin pipe 14 is in close contact with the rear end surface thereof.

  Further, since the insertion guide 32 is made of a synthetic resin having rigidity, it is not deformed or damaged when pressed by the resin pipe 14. Therefore, the function of the insertion guide 32 can be maintained.

  Therefore, according to the joint 10 of the present embodiment, the insertion guide 32 can be tilted with the insertion of the resin pipe 14, the damage to the seal member 41 can be suppressed, and the water stoppage of the joint 10 can be improved. Can do.

  (2) Since the outer peripheral portion of the insertion guide 32 is composed of the protruding portion 39 having a mountain-shaped cross section, the contact resistance of the protruding portion 39 with respect to the inner peripheral surface of the cover cylinder 29 can be sufficiently reduced. The insertion guide 32 can be tilted easily.

  (3) Since the inner peripheral portion of the insertion guide 32 is constituted by the flat surface 40, the contact area of the flat surface 40 with respect to the first seal member 41a and the second seal member 41b is increased to sufficiently increase the contact resistance. The insertion guide 32 can be easily tilted.

  (4) Since the front end edge 32a and the rear end edge 32b of the inner peripheral part of the insertion guide 32 are formed in a circular arc shape, the insertion guide 32 is the outer periphery of the first seal member 41a and the second seal member 41b. It is possible to prevent the sealing members 41a and 41b from being damaged when passing through.

  (5) Since the insertion guide 32 is formed in a longitudinally symmetrical shape, the same function as the insertion guide 32 is exhibited even when the insertion guide 32 is installed in the joint 10 in the reverse direction. It is possible to improve the assembling property.

In addition, this embodiment can also be changed and embodied as follows.
As shown in FIG. 6A, the insertion guide 32 can be formed in a triangular cross section, the top portion can be a projecting portion 39, and the inner peripheral portion can be a flat surface 40.

  As shown in FIG. 6 (b), the insertion guide 32 is formed in a pentagonal cross-sectional shape that becomes narrower toward the outer peripheral side, the top part is a projecting part 39, and the inner peripheral part is a flat surface 40. Can do. Furthermore, the insertion guide 32 can be formed in a polygonal shape such as a heptagonal cross section so as to have a protrusion 39 at the top.

  The projecting portion 39 may be provided on the outer peripheral surface of the insertion guide 32 at a predetermined interval in the circumferential direction so that the outer peripheral portion of the insertion guide 32 is in point contact with the inner peripheral surface of the cover cylinder 29. . In this case, the contact resistance of the insertion guide 32 with respect to the inner peripheral surface of the cover cylinder 29 can be further reduced as compared with the case of line contact in the embodiment.

  The top of the protruding portion 39 does not have to be sharp and may have a circular arc shape, a flat shape, or the like. In the case of a flat shape, for example, as shown in FIGS. 7A and 7B, the protruding portion 39 of the insertion guide 32 is configured to have a flat portion 39a extending in the circumferential direction at the top thereof. . The function of the insertion guide 32 can be stably exhibited by the flat portion 39a.

  The inner peripheral portion of the insertion guide 32 may be formed in an arc shape in cross section so that the contact resistance with respect to the seal member 41 can be reduced. In this case, the contact resistance of the insertion guide 32 with respect to the cover cylinder 29 and the contact resistance of the insertion guide 32 with respect to the seal member 41 can be adjusted.

  -The seal member 41 can also be constituted by one, for example, by omitting the second seal member 41b fitted in the second concave groove 43b. Furthermore, the second seal member 41b may be used instead of the first seal member 41a, and a plurality of second seal members (O-rings) 41b may be provided.

It is also possible to omit the cover cylinder 29 and set the inner diameter of the outer cylinder portion 17 to the inner diameter of the cover cylinder 29.
The contact resistance of the insertion guide 32 with respect to the cover cylinder 29 or the seal member 41 can be adjusted by changing the outer diameter or inner diameter of the insertion guide 32.

As the pipe, in addition to the resin pipe 14, a metal pipe such as copper or copper alloy can be used.
Further, the technical idea that can be grasped from the embodiment will be described below.

(B) The joint according to any one of claims 1 to 5 , wherein the insertion guide is formed of an engineering plastic. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-5 , the rigidity of an insertion guide can fully be improved.

(B) The fitting guide according to any one of claims 1 to 5 , wherein the insertion guide is formed in a polygonal cross section so as to have a protruding portion on an outer peripheral portion. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-5 , the insertion guide which carries out a line contact to the internal peripheral surface of an outer cylinder part can be manufactured easily.

  (C) The fitting guide according to claim 1, wherein the insertion guide is configured by a projecting portion having a flat portion at the top of the outer peripheral portion. When comprised in this way, in addition to the effect of the invention which concerns on Claim 1, the insertion guide can exhibit the function stably.

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Joint main body, 13 ... Inner cylinder part, 14 ... Resin pipe as a pipe, 14a ... Tip surface, 15 ... Insertion space, 29 ... Cover cylinder which comprises outer cylinder part, 32 ... Insertion Guide, 32a ... front end edge, 32b ... rear end edge, 15 ... insertion space, 17 ... outer cylinder part, 39 ... projecting part, 40 ... flat surface, 41 ... seal member, 41a ... first seal member, 41b ... 2nd sealing member, 43a ... 1st ditch | groove, 43b ... 2nd ditch | groove.

Claims (5)

A joint body to which a pipe is inserted and connected; an inner cylinder part protruding from the joint body; an outer cylinder part provided so as to form an insertion space for the pipe on the outer periphery of the inner cylinder part; A joint provided with a seal member that is fitted in a concave groove provided on the outer peripheral surface of the inner cylinder portion to stop water contact with the pipe, and an insertion guide that is pressed by the tip of the pipe to guide the pipe Because
The insertion guide has rigidity, and the contact area of the outer peripheral portion with respect to the inner peripheral surface of the outer cylinder portion is set to be smaller than the contact area of the inner peripheral portion with respect to the seal member. The joint is characterized in that it can be tilted following the movement , and the insertion guide is formed in a symmetric shape . The outer peripheral portion of the insertion guide is configured to make point contact or line contact with the inner peripheral surface of the outer cylinder portion, and the inner peripheral portion is configured to make surface contact with the outer peripheral surface of the seal member. The joint according to claim 1. The joint according to claim 2, wherein an outer peripheral portion of the insertion guide is configured by a protruding portion having a mountain-shaped cross section. The joint according to claim 2 or 3, wherein an inner peripheral portion of the insertion guide is formed by a flat surface. The joint according to any one of claims 1 to 4, wherein a front end edge and a rear end edge of the inner peripheral portion of the insertion guide are formed in a circular arc shape in cross section .

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