JP6553443B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

  As a conventional pipe joint, for example, a convex portion (large diameter portion) formed on the outer peripheral surface of the inner cylinder when the inner cylinder (collar) and the outer cylinder (sleeve) formed in a cylindrical shape are press-fit and assembled It is known to engage with a recess (groove) formed on the inner peripheral surface of the outer cylinder (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2015-7435

  However, if foreign matter (for example, dust, burrs (deformed parts such as projections produced during press-in, of course, those separated from the inner cylinder or outer cylinder)) get caught between the convex portion and the concave portion during press-in, For example, by assembling in a state in which at least one of the inner cylinder and the outer cylinder is deformed, there is a possibility that the engagement force of the convex portion and the concave portion may be reduced.

  The problem to be solved by the present invention is to provide a convex portion formed on any one of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, and the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. In the pipe joint that engages the concave portion formed on the other, the convex portion and the concave portion generated by engaging the convex portion and the concave portion with foreign matter sandwiched between the convex portion and the concave portion. An object of the present invention is to provide a pipe joint which can suppress a decrease in engagement force.

The pipe joint according to the present invention includes an inner cylinder formed in a cylindrical shape,
An outer cylinder formed in a cylindrical shape and assembled to the outer side of the inner cylinder by press-fitting relative to the inner cylinder in a press-fitting direction along the axial direction;
A convex portion formed on any one of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder;
And a concave portion formed on the other of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, which engages with the convex portion.
A gap is formed between the convex portion and the concave portion.
ADVANTAGE OF THE INVENTION According to the pipe joint which concerns on this invention, the fall of the engagement force of a convex part and a recessed part which arises by engaging a convex part and a recessed part in the state which the foreign material pinched can be suppressed.

In the pipe joint according to the present invention, the gap is preferably formed axially adjacent to the convex portion.
In this case, the foreign object is easily accommodated in the gap, which is effective in suppressing the decrease in the engagement force.

In the pipe joint according to the present invention, the hardness of the outer cylinder is preferably lower than the hardness of the inner cylinder.
In this case, the inner cylinder and the outer cylinder having different hardnesses are press-fitted and assembled, so that burrs as foreign matters (including deformation parts such as protrusions generated during the press-fitting, as well as those separated from the inner cylinder or the outer cylinder) are included. Since the present invention is adopted for a pipe joint which is likely to occur, it is effective for suppressing the decrease in the engagement force.

In the pipe joint according to the present invention, it is preferable that the outer cylinder is formed of a resin material and the inner cylinder is formed of a metal material.
In this case, by fitting the metal and resin by press-fitting, it is possible to form a pipe joint which is likely to generate burrs as foreign substances (including deformed parts such as projections produced at the time of press-fitting as well as those separated from the inner cylinder or outer cylinder). Since the present invention is adopted, it is effective for suppressing a decrease in engagement force.

In the pipe joint according to the present invention, a plurality of the convex portions are formed at intervals in the axial direction, and the gap is formed between all the convex portions and the concave portions that engage with the convex portions. It is preferable to do.
In this case, it is possible to suppress a decrease in engagement force at all the engagement points.

In the pipe joint according to the present invention, a plurality of the convex portions are formed at intervals in the axial direction, and the gap is formed at least between the inner cylinder in which the convex portions are formed and the outer cylinder. It is preferable to form between the convex part formed at the most rear side in the press-fitting direction with respect to any one of the cylinders and the concave part engaged with the convex part.
In this case, mainly by suppressing the decrease in the engagement force caused by the foreign matter, which occurs at the engagement portion between the convex portion formed on the most rear side in the press-fitting direction and the concave portion engaged with the convex portion. A decrease in resultant force can be easily suppressed.

In the pipe joint according to the present invention, a plurality of the convex portions are formed at intervals in the axial direction, and the gap is formed at least between the inner cylinder in which the convex portions are formed and the outer cylinder. It is preferable to form between the convex part formed in the foremost side in the press-fitting direction with respect to any one of the cylinders and the concave part engaged with the convex part.
In this case, mainly by suppressing the decrease in the engaging force caused by the foreign matter, which occurs at the engaging portion between the convex portion formed on the most front side in the press-fitting direction and the concave portion engaged with the convex portion. A decrease in resultant force can be easily suppressed.

  According to the present invention, it is possible to suppress a decrease in the engagement force of the convex portion and the concave portion caused by engaging the convex portion and the concave portion in a state in which the foreign matter is sandwiched between the convex portion and the concave portion. Can be provided.

It is a sectional view showing a tube joint concerning a 1st embodiment of the present invention. It is a principal part enlarged view of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2. It is sectional drawing which shows the header comprised with the pipe joint which concerns on the 2nd-4th embodiment of this invention. (A), (b) is an expanded sectional view explaining an effect | action when a cap is assembled | attached to a valve main body in manufacture of the pipe joint which concerns on the 1st Embodiment of this invention, respectively. (A) is an expanded sectional view which shows the state which assembled | attached the cap normally to the valve main body in manufacture of the conventional pipe joint, (b) is a valve main body and cap in the manufacture of the pipe joint of (a). And a foreign substance having been caught between the valve body and the cap body.

  Pipe joints according to various embodiments of the present invention will now be described with reference to the drawings.

  In FIG. 1, the code | symbol 1 is a pipe joint which concerns on the 1st Embodiment of this invention. In the present embodiment, the pipe joint 1 is configured as a valve joint. The pipe joint 1 includes a valve main body (inner cylinder) 2 formed in a cylindrical shape, and a pipe portion 3 formed in a cylindrical shape and assembled to the valve main body 2 inside the valve main body 2. In the present embodiment, both the valve body 2 and the pipe portion 3 are metal parts such as a copper casting (for example, CAC 406C). Further, in the present embodiment, the pipe portion 3 is disposed coaxially with the axis O1 of the valve body 2. Specifically, since the valve body 2 is formed inside the valve body 2, the screw part 2 s is assembled to the pipe part 3 by being screwed into a male screw part 3 s formed outside the pipe part 3. In particular, in the present embodiment, a seal member (for example, an O-ring) S is disposed between the valve body 2 and the pipe portion 3 in the axial direction to seal between the valve body 2 and the pipe portion 3. There is.

  Further, in the present embodiment, the ball seat 4 is disposed inside the valve body 2 and the pipe portion 3. The ball sheet 4 supports the ball 5. A handle 7 is connected to the ball 5 via a valve rod 6. The valve rod 6 is sealed by the seal member S between the valve body 2 and the valve rod 6. The handle 7 can be rotated about an axis O2 orthogonal to the axis O1. Thereby, the valve can be opened and closed by rotating the ball 5.

  Furthermore, the code | symbol P1 shown with a broken line in FIG. 1 is one side of the pipe body which distribute | circulates fluid, such as a cold / hot water. The valve body 2 has an inner peripheral surface 2f that holds one tubular body P1 so as to be slidable in the axial direction (in this embodiment, the direction extending along the axis O1). Further, in the present embodiment, the valve body 2 is further provided with a support ring 8. The support ring 8 has an inner peripheral surface 8 f which slidably holds the pipe body P 1 in the axial direction together with the inner peripheral surface 2 f of the valve body 2. In particular, in this embodiment, the outer peripheral surface of the tubular body P1 is sealed by disposing a seal member S such as an O-ring between the valve body 2 and the support ring 8 in the axial direction. Moreover, the pipe part 3 has an adapter part 3 a to which other joints (not shown) can be attached, and a fluid such as cold / hot water from the pipe body P <b> 1 flows in accordance with the rotation of the ball 5 inside the pipe part 3. It can be done.

  Furthermore, a cap (outer cylinder) 9 is attached to the valve body 2. In the present embodiment, the hardness (hardness) of the cap 9 is lower than the hardness of the valve body 2. In detail, in the present embodiment, the cap 9 is a resin component such as polyacetal. The cap 9 is assembled by press-fitting in the press-fitting direction along the axial direction with respect to the valve body 2 to the outside of the valve body 2 as described later. In the present embodiment, the cap 9 is disposed coaxially with the axis O1 of the valve body 2.

  The cap 9 holds the support ring 8 in the axial direction, and is provided with a lock ring 10 and a release ring 11 inside thereof. The lock ring 10 has a plurality of claw portions 10a arranged on the inner peripheral side thereof at intervals in the circumferential direction, and these claw portions 10a bite into or come into contact with the outer peripheral surface of the pipe member P1 so that the pipe member Hold P1 axially. The release ring 11 has an inner circumferential surface 11 f which slidably holds the pipe member P1 in the axial direction. Further, the release ring 11 is configured to be able to release biting of the claw portion 10a into the tubular body P1 by sliding in the axial direction.

  More specifically, the pipe joint 1 is assembled to the outside of the valve body 2 with a cap 9 being relatively press-fitted in the press-fit direction along the axial direction with respect to the valve body 2. The pipe joint 1 has a convex portion 12 formed on one of the outer peripheral surface of the valve main body 2 and the inner peripheral surface of the cap 9 (in the present embodiment, the outer peripheral surface of the valve main body 2) Of the inner peripheral surface of the cap 9 and the other inner surface (in this embodiment, the inner peripheral surface of the cap 9) of the cap 9, and a concave portion 13 that engages with the convex portion 12.

  In the present embodiment, as shown in FIG. 2, the convex portion 12 is an annular convex portion which protrudes from the outer peripheral surface of the valve main body 2 and extends around the axis (in the present embodiment, “around the axis O1”). is there. In the present embodiment, the two protrusions 12 are axially spaced apart. In particular, in the present embodiment, as shown in FIG. 2 and FIG. 3, of the two protrusions 12, the valve main body 2 in which the protrusions 12 are formed is pressed into the cap 9 (hereinafter simply referred to as “press-fit direction The convex portion 12 formed on the most front side of the above is referred to as a front side convex portion 12A, and the convex portion 12 formed on the most rear side in the press-fitting direction is referred to as a rear side convex portion 12B.

  Furthermore, in this embodiment, as shown in FIG. 3, each convex part 12 has the front side outer peripheral surface 12a on the front side in the press-fitting direction. The front side outer peripheral surface 12a is an annular inclined surface formed so as to surround the axis O1. In the present embodiment, the front side outer peripheral surface 12 a is shaped by increasing the diameter of the convex portion 12 at a constant rate as it goes from the front to the rear (from the front to the rear in the press-fitting direction). Moreover, the convex part 12 has the largest outer peripheral surface (outer peripheral surface where a radial dimension becomes the maximum) 12b connected to the front side outer peripheral surface 12a, as shown in FIG. The maximum outer peripheral surface 12b is formed by keeping the diameter of the convex portion 12 constant from the rear end of the front outer peripheral surface 12a to the rear. Furthermore, as shown in FIG. 3, the convex part 12 has the back side outer peripheral surface 12c connected with the largest outer peripheral surface 12b. The rear outer circumferential surface 12 c is shaped as an annular surface which is orthogonal to the axial direction and extends around the axis. In the present embodiment, the maximum outer peripheral surface 12 b and the rear outer peripheral surface 12 c are smoothly connected. Further, although the front side convex portion 12A and the rear side convex portion 12B are formed in the same shape and the same size, the shape and size of the front side convex portion 12A and the rear side convex portion 12B should be appropriately changed. Can.

  In the present embodiment, the recess 13 is an annular recess formed on the inner peripheral surface of the cap 9 extending around the axis. In this embodiment, the two recessed parts 13 are arrange | positioned at intervals in the axial direction. As shown in FIGS. 2 and 3, in the present embodiment, the concave portion 13 formed on the foremost side in the press-fitting direction of the two concave portions 13 is referred to as the front-side concave 13 A, and the most in the press-fitting direction. The concave portion 13 formed on the rear side is referred to as a rear side concave portion 13B.

  In this embodiment, as shown in FIG. 3, the recessed part 13 has the front side internal peripheral surface 13a in the front side of a press injection direction. The front-side inner peripheral surface 13a is an annular inclined surface formed so as to surround the axis O1. In the present embodiment, the front-side inner peripheral surface 13a is formed by increasing the diameter dimension of the recess 13 at a constant rate from the front toward the rear. Moreover, the recessed part 13 has the largest inner peripheral surface (inner peripheral surface where a radial dimension becomes the maximum) 13b connected with the front side inner peripheral surface 13a, as shown in FIG. The maximum inner peripheral surface 13b is formed by keeping the diameter of the concave portion 13 constant from the rear end of the front inner peripheral surface 12a to the rear. Furthermore, the recessed part 13 has the back side internal peripheral surface 13c connected with the largest internal peripheral surface 13b, as shown in FIG. The rear inner peripheral surface 13c is formed as an annular surface that is orthogonal to the axial direction and extends around the axis. In the present embodiment, the maximum inner peripheral surface 13b and the rear side inner peripheral surface 13c are smoothly connected. Moreover, although the front side recessed part 13A and the back side recessed part 13B are formed in the same shape and the same dimension, the shape and dimension of the front side recessed part 13A and the back side recessed part 13B can be changed suitably.

  In the present embodiment, as shown in FIGS. 2 and 3, a gap C is formed between the convex portion 12 and the concave portion 13 in a state in which the cap 9 is press-fit and assembled to the outside of the valve main body 2. . In particular, in the present embodiment, as shown in FIG. 3, the gap C is a protrusion when the cap 9 is press-fit relative to the valve body 2 in the press-fitting direction along the axial direction relative to the valve body 2. 12 between the front outer peripheral surface 12a of the front surface 12 and the front inner peripheral surface 13a of the concave portion 13 and between the maximum outer peripheral surface 12b of the convex portion 12 and the maximum inner peripheral surface 13b of the concave portion 13. The gap C2 and the gap C3 formed between the rear outer peripheral surface 12c of the protrusion 12 and the rear inner peripheral surface 13c of the recess 13 are formed to communicate with each other. 2 and 3, the gaps C1 to C3 are formed so as to communicate with each other, but at least one of the gaps C1 to C3 may be formed. Further, in the present embodiment, while keeping the gaps C1 and C2 substantially the same, the gap C3 is made larger than the gap C2 to cope with the entry of foreign matter in the axial direction. The relative relationship regarding the gap can be changed as appropriate.

  Here, with reference to FIG. 5 (a) and FIG. 5 (b), the operation when the cap 9 is assembled to the valve body 2 in the manufacture of the pipe joint 1 according to the present embodiment will be described.

  When the valve body 2 is press-fit into the cap 9, as shown in FIG. 5A, for example, the front side convex portion 12A formed on the valve body 2 rubs the inner circumferential surface 9f of the cap 9 Even if burrs B are formed in the vicinity of the rear side inner circumferential surface 13c of the concave portion 13, the burrs B as foreign matter are to the convex portions 12 formed on the valve main body 2 as shown in FIG. By being accommodated in the gap C3 formed adjacent to the axial direction in the gap C, the engagement margin D1 between the convex portion 12 and the concave portion 13 formed in the cap 9 (specifically, the convex portion 12) The same engagement margin as the engagement margin D1 in the normal state shown in FIG. 3 in which no foreign matter intervenes is secured as an axial hook between the rear outer peripheral surface 12c and the rear inner peripheral surface 13c of the recess 13). A convex portion 12 formed in the valve body 2 and a concave portion 13 formed in the cap 9 Engagement is reliably ensured without causing inclination, not deformed or expected the valve body 2 and the cap 9 (displacement). For this reason, the engagement force itself between the convex portion 12 formed on the valve body 2 and the concave portion 13 formed on the cap 9 does not decrease not only in the axial direction but also in the axial direction.

  On the other hand, FIG. 6A shows a conventional structure in which no gap C is formed between the convex portion 12 formed on the valve body 2 and the concave portion 13 formed on the cap 9. In the conventional structure shown in FIG. 6A, when a foreign matter such as a burr B is interposed between the convex portion 12 and the concave portion 13, the gap between the convex portion 12 and the concave portion 13 as shown in FIG. For example, the cap 9 is deformed or unexpectedly inclined (displaced), and the protrusion 12 formed on the valve body 2 and the recess 13 formed on the cap 9 are engaged. It will be incomplete. In this case, the engagement margin D2 between the convex portion 12 formed on the valve body 2 and the concave portion 13 formed on the cap 9 is larger than the normal engagement margin D1 shown in FIG. Also becomes smaller. Therefore, the engagement force between the convex portion 12 formed in the valve main body 2 and the concave portion 13 formed in the cap 9 is in the normal state (the convex portion 12 and the concave portion 13 shown in FIG. In the case where the shape and size are the same as in the pipe joint 1 according to the present embodiment, the engagement force is lower than in the case of the pipe joint 1).

  Thus, as in the pipe joint 1 according to the present embodiment shown in FIG. 5 (b), if the gap C is formed in advance between the convex portion 12 and the concave portion 13, a cap is provided on the outside of the valve main body 2. When 9 is press-fitted and assembled, foreign matter (for example, dust, burrs (deformation parts such as protrusions generated during press-fitting, as well as those separated from the inner cylinder or the outer cylinder) are provided between the convex part 12 and the concave part 13. Even if the foreign matter is contained in the gap C even if there is a possibility of ingress)), the projection 12 and the cap 9 are assembled in a state in which at least one of the valve body 2 and the cap 9 is deformed. There is no possibility that the engaging force of the recess 13 is reduced. Therefore, according to the pipe joint 1 according to the present embodiment, it is possible to suppress the decrease in the engagement force between the convex portion 12 and the concave portion 13 caused by engaging the convex portion 12 and the concave portion 13 in a state where foreign matter is caught. it can. For this reason, for example, even if the valve body 2 and the cap 9 are strongly pulled in the opposite direction to the press-fitting direction, the possibility of the cap 9 being detached from the valve body 2 is reduced.

  In particular, in the pipe joint 1 according to this embodiment, the gap C3 of the gap C is formed adjacent to the convex portion 12 in the axial direction. In this case, as described with reference to FIGS. 5A and 5B, the foreign matter is easily accommodated in the gap C, which is effective in suppressing a decrease in engagement force. Furthermore, in the present embodiment, in the gap C, the gap C1 is effective when foreign matter intervenes between the front outer peripheral surface 12a of the convex portion 12 and the front inner peripheral surface 13a of the concave portion 13. C2 is effective when a foreign substance is interposed between the maximum outer peripheral surface 12b of the convex portion 12 and the maximum inner peripheral surface 13b of the concave portion 13. In particular, the gap C1 directly adjusts the gap between the front outer peripheral surface 12a of the projection 12 and the front inner peripheral surface 13a of the recess 13. Needless to say, the front outer peripheral surface 12a of the projection 12 By adjusting the front side inner peripheral surface 13a of the recess 13 to a different angle, a desired gap interval can be obtained. As a specific example, referring to FIG. 3, an angle θ12 between the front outer peripheral surface 12a of the convex portion 12 and the maximum outer peripheral surface 12b, and an angle θ13 between the front inner peripheral surface 13a of the recess 13 and the maximum inner peripheral surface 13b. And can be adjusted to different angles. Specifically, if the angle θ12 is θ12 = 25 °, the angle θ13 is θ13 = 28 °, and the difference between the angles θ12 and θ13 is 3 °, the width of the gap C1 can be widely secured. Furthermore, in the present embodiment, since the three gaps C1 to C3 communicate with each other, it is effective in the case where the foreign matter moves in the axial direction between the convex portion 12 and the concave portion 13.

  Further, in the pipe joint 1 according to the present embodiment, the hardness of the cap 9 is lower than the hardness of the valve body 2. In this case, the valve main body 2 and the cap 9 having different hardnesses are press-fitted and assembled, so that burrs as foreign matters (deformations such as protrusions generated during press-fitting, as well as those separated from the valve main body 2 or the cap 9 are included. The present invention is applied to a pipe joint that is prone to), which is effective in suppressing the decrease in engagement force.

  Further, in the pipe joint 1 according to the present embodiment, the cap 9 is formed of a resin material, and the valve body 2 is formed of a metal material. In this case, a pipe joint is apt to have burrs as foreign substances (including deformed parts such as projections produced at the time of press-in, as well as those separated from the valve body 2 or the cap 9) by press-fitting and assembling metal and resin. Since the present invention is adopted in the present invention, it is effective in suppressing the decrease in the engagement force.

  In the pipe joint 1 according to the present embodiment, a plurality of convex portions 12 are formed at intervals in the axial direction, and a gap C is formed between all the convex portions 12 and the concave portions 13 that engage with the convex portions 12. It is formed between. In this case, the decrease in the engagement force can be suppressed at all the engagement points.

  In addition, according to the present embodiment, a plurality of convex portions 12 are formed at intervals in the axial direction, and a gap C is formed between at least the valve body 2 in which the convex portions 12 are formed among the plurality of convex portions 12. It can form between the convex part 12 formed in the most back side in the said press-fit direction with respect to any one other of the caps 9, and the concave part 13 engaged with this convex part 12. FIG.

  For example, when the pipe joint 1 according to the first embodiment is taken as an example, the gap C is set at least in the press-fitting direction with respect to the cap 9 of the valve body 2 formed with the convex portion 12 of the two convex portions 12A and 12B. It can be formed between the rear side convex portion 12B formed on the most rear side and the rear side concave portion 13B engaged with the rear side convex portion 12B. In this case, the engagement portion between the rear side convex portion 12B mainly formed on the rearmost side in the press-fitting direction and the concave portion 13B engaged with the rear side convex portion 12B, ie, between the valve body 2 and the cap 9 By suppressing the decrease in the engagement force caused by the foreign matter, which occurs at the engagement location where the foreign matter can deeply enter the axial direction following the press-fitting operation, the decrease in the engagement force can be easily suppressed. Furthermore, in this case, the gap C is not formed by forming the gap C between the rear side convex portion 12B and the rear side concave portion 13B, that is, if the space C is not formed in the other engaging portion It is possible to suppress the rattling of the inner cylinder and the outer cylinder, that is, the rattling of the valve body 2 and the cap 9, which may be caused by the above.

  Furthermore, according to the present invention, as a pipe joint according to still another embodiment, a plurality of convex portions 12 are formed at intervals in the axial direction, and the gap C is at least convex among the plurality of convex portions 12. A convex portion 12 formed on the foremost side in the press-fitting direction with respect to one of the valve main body 2 and the cap 9 in which the portion 12 is formed, and a concave portion 13 engaged with the convex portion 12; Can be formed between

  For example, when the pipe joint 1 according to the first embodiment is taken as an example, the gap C is set at least in the press-fitting direction with respect to the cap 9 of the valve body 2 formed with the convex portion 12 of the two convex portions 12A and 12B. It can be formed between the front-side convex portion 12A formed on the most front side and the front-side concave portion 13A engaged with the front-side convex portion 12A. In this case, an engagement portion between the convex portion formed mainly on the most front side in the press-fitting direction and the concave portion engaged with the convex portion, that is, the burr B is likely to occur first, and dust from the outside, etc. By suppressing the fall of the engagement force caused by the foreign matter, which occurs at the engagement point where the first approach is made, the fall of the engagement force can be easily suppressed. Further, in this case, if the gap C is not formed between the front-side convex portion 12A and the front-side concave portion 13A, that is, if the gap C is not formed in the other engaging portion, the gap C is formed. It is possible to suppress the rattling of the inner cylinder and the outer cylinder, that is, the rattling of the valve body 2 and the cap 9, which may be caused by the above.

  Next, in FIG. 4, reference numeral 100 is a header constituted by a pipe joint according to the second to fourth embodiments of the present invention. The header 100 illustrated in FIG. 4 includes a pipe joint 20 according to the second embodiment of the present invention, a pipe joint 30 according to the third embodiment of the present invention, and a pipe according to the fourth embodiment of the present invention. And a joint 40. Specifically, a total of four pipe joints of one pipe joint 20, two pipe joints 30, and one pipe joint 40 are connected in series in the axial direction (left and right direction in FIG. 1). .

  The pipe joint 20 according to the second embodiment of the present invention is disposed on the first axial side (right side in the drawing). Specifically, the pipe joint 20 has a tubular member 21 configured in a substantially L-shape, and the tubular member 21 has a tubular end on the second axial side (left side in the drawing) of the tubular member 21. It is formed in the portion 21b, and further has a pipe connection port 22 facing the direction perpendicular to the axial direction at the end 21a on the first axial side of the tubular member 21. The pipe connection port 22 is attached to the outer side of the tubular member 21, and is formed in a cylindrical shape with a connector member (inner cylinder) 23. And a cap (outer cylinder) 9 which is relatively press-fitted and assembled in a press-fitting direction along a direction perpendicular to the direction. In the present embodiment, both the tubular member 21 and the connector member 23 are resin parts made of a polyphenylene sulfide resin or the like which is reinforced by glass fibers and has a hardness higher than that of the polyacetal constituting the cap 9.

  The pipe joint 20 includes a convex portion 12 formed on one of the outer peripheral surface of the connector member 23 and the inner peripheral surface of the cap 9, the outer peripheral surface of the connector member 23, and the inner peripheral surface of the cap 9. And a recess 13 formed on the other side and engaged with the protrusion 12. In the present embodiment, the convex portion 12 is provided on the connector member 23, and the concave portion 13 is provided on the cap 9. In the present embodiment, the gap C is formed between the convex portion 12 and the concave portion 13 in a state where the cap 9 is press-fit and assembled to the outside of the connector member 23.

  The pipe joint 30 according to the third embodiment of the present invention has a tubular member 31 formed in a substantially T shape, and the adapter member 31 b whose end on the second axial side of the tubular member 31 is tubular And a pipe connection port 32 on the first side in the axial direction at the end 31 a of the tubular member 31 on the first side. Further, the pipe joint 30 has a pipe connection port 22 at an end 31 c branched from between both axial ends 31 a and 31 b of the tubular member 31 and facing in a direction perpendicular to the axial direction. The pipe connection port 22 uses a connector member (inner cylinder) 33 similar to the connector member 23 of the pipe joint 20 according to the second embodiment of the present invention, so that the pipe joint according to the second embodiment is basically used. The configuration is the same as that of the 20 pipe connection ports 22.

  On the other hand, the pipe connection port 32 is provided in a position facing the adapter portion 31b in the axial direction, and is formed in a cylindrical shape with an end portion (inner cylinder) 31a of the tubular member 31 formed in a cylindrical shape. A cap (outer cylinder) 9 is assembled on the outer side of the end 31a of the tubular member 31 with respect to the end 31a in a press-fitting direction relatively along the axial direction. In the present embodiment, the tubular member 31 is, together with the connector member 33, a resin component such as polyphenylene sulfide resin reinforced by glass fiber.

  Similarly to the pipe joint 20, in the pipe joint 30, a gap C is formed between the convex portion 12 and the concave portion 13 on the pipe connection port 22 side. Further, the pipe joint 30 includes a convex portion 12 formed on one of the outer peripheral surface of the end portion 31 a of the tubular member 31 and the inner peripheral surface of the cap 9, and the outer peripheral surface of the end portion 31 b of the tubular member 31. And a recess 13 formed on the other of the inner circumferential surfaces of the cap 9 and engaged with the protrusion 12. In the present embodiment, the convex portion 12 is provided at the end 31 a of the tubular member 31, and the concave portion 13 is provided at the cap 9. In the present embodiment, a gap C is formed between the convex portion 12 and the concave portion 13 in a state where the cap 9 is press-fitted and assembled to the outside of the end portion 31 a of the tubular member 31.

  The pipe joint 40 according to the fourth embodiment of the present invention is disposed on the second side in the axial direction. Specifically, the pipe joint 40 also has a tubular member 41 configured in a substantially T shape, and has a pipe connection port 32 at the end 41 a on the first axial side of the tubular member 41. The pipe connection port 22 is provided at an end portion 41c of the tubular member 41 that branches from between both end portions 41a and 41b in the axial direction and faces the direction perpendicular to the axial direction. The pipe connection port 22 assembles the connector member 43 similar to the connector member 33 of the pipe joint 30 according to the third embodiment of the present invention to the outside of the end 41 c of the tubular member 41. By using the end portion 43c facing the vertical direction, the configuration is basically the same as the pipe connection port 22 of the pipe joints 20 and 30 according to the second and third embodiments. Also, the pipe connection port 32 is basically the third one by using the end 41 b of the tubular member 41 similar to the end 31 b of the tubular member 31 of the pipe joint 30 according to the third embodiment of the present invention. It has the same configuration as the pipe connection port 32 of the pipe joint 30 according to the embodiment.

  Further, the pipe joint 40 has a pipe connection port 42 on the second axial side of the tubular member 41. The pipe connection port 41 is formed in a tubular shape with the second end (inner cylinder) 43b of the connector member 43 in the axial direction, and the end 43a of the connector member 43 is provided outside the end 43b. And a cap (outer cylinder) 9 relatively press-fit and assembled in a press-fitting direction along the axial direction. In the present embodiment, the connector member 43 together with the tubular member 41 is a resin component such as polyphenylene sulfide resin reinforced by glass fiber.

  In the pipe joint 40, similarly to the pipe joint 30, a gap C is formed between the convex portion 12 and the concave portion 13 on the side of the pipe connection ports 22 and 32. Furthermore, the pipe joint 40 has a protrusion 12 formed on either the outer peripheral surface of the end 43 b of the connector member 43 or the inner peripheral surface of the cap 9, and the outer peripheral surface of the end 43 b of the connector member 43 And a recess 13 formed on the other of the inner circumferential surfaces of the cap 9 and engaged with the protrusion 12. In the present embodiment, the convex portion 12 is provided at the end 43 b of the connector member 43, and the concave portion 13 is provided at the cap 9. In the present embodiment, a gap C is formed between the convex portion 12 and the concave portion 13 in a state where the cap 9 is press-fitted and assembled to the outside of the end portion 43 b of the connector member 43.

  Now, with reference to FIG. 3, in the pipe joint according to the present invention, the width d of the gap C needs to be at least as wide as the thickness of foreign matter such as burrs and dust. The width d of the gap C is a dimension that can be appropriately set according to the material of the valve body 2 and the cap 9 or the like. For example, the valve body 2 is made of a copper casting (CAC 406C), and the cap 9 is made of polyacetal resin. As shown in FIG. 3, the width d of the gap C1 is d1 and the width d of the gap C2 is d Assuming d2 and the width of the gap d of the gap C3 as d3, the thickness of foreign matter such as burrs and dust is assumed to be 0.1 mm or less based on an empirical rule. Therefore, in this case, the width d1 of the gap C1, the width d2 of the gap C2 and the width d3 of the gap C3 are preferably set to 0.1 mm or more.

  Furthermore, foreign substances such as burrs and dust (especially burrs) may cause deformation such as twisting. Therefore, in the pipe joint according to the present invention, it is preferable to make the width of the gap d of the gap C wider than the thickness of foreign matter such as burrs and dust. In particular, when the valve body 2 is made of a copper casting (CAC406C) and the cap 9 is made of polyacetal resin, the width d1 of the gap C1 is 0.16 mm, the width d2 of the gap C2 is 0.15 mm, If the width d3 of the gap C3 is set to 0.25 mm, it is possible to further suppress the decrease in the engagement margin D1 due to biting (sandwiping) of foreign matter such as burrs and dust.

  The above description is only one embodiment of the present invention, and various modifications are possible according to the claims. For example, although the inner cylinder and the outer cylinder according to the present invention are a valve body, a tubular member, or a combination of a connector member and a cap, a combination of various components such as a combination of tubular members can be selected. Further, in the pipe joint according to the present invention, when the inner cylinder and the outer cylinder formed in a cylindrical shape are press-fitted and assembled, the convex portion formed on the outer peripheral surface of the inner cylinder and the concave portion formed on the inner peripheral surface of the outer cylinder In addition, the concave portion formed on the outer peripheral surface of the inner cylinder and the convex portion formed on the inner peripheral surface of the outer cylinder can be engaged. Moreover, although the place mentioned above demonstrated by the combination of the metal inner cylinder and the resin outer cylinder, the combination of the resin inner cylinder and the metal outer cylinder, the combination of the metal inner cylinder and the outer cylinder, Or it can also be set as the combination of resin-made inner cylinders and outer cylinders.

  The fitting according to the invention can be used for any fluid, such as liquid (e.g. cold water, hot water, oil etc) or gas.

DESCRIPTION OF SYMBOLS 1; Pipe joint (1st embodiment), 2; Valve main body (inner cylinder), 9; Cap (outer cylinder), 12; Convex part, 12A; Front side convex part (convex part formed most front side , 12B; rear side convex part (convex part formed on the rearmost side), 13; concave part, 13A; front side convex part (concave part formed on the frontmost side), 13B; Concave portion formed on the side), 20; pipe joint (second embodiment), 23; connector member (inner cylinder), 30; pipe joint (third embodiment), 31; tubular member, 31a; tubular member End (inner cylinder), 33; connector member (inner cylinder), 40; pipe joint (fourth embodiment), 41; tubular member, 41a; end of tubular member (inner cylinder), 43; connector member (Inner cylinder), 43b; end of connector member (inner cylinder), 43c; end of connector member Inner cylinder), C; gap, C3; gaps formed adjacent to the axial direction relative to the convex portion

Claims (6)

An inner cylinder formed in a cylindrical shape;
An outer cylinder that is formed in a cylindrical shape and is relatively press-fitted and assembled to the outer side of the inner cylinder in the press-fitting direction along the axial direction with respect to the inner cylinder;
A convex portion formed on any one of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder;
A concave portion that is formed on the other of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder and that engages with the convex portion;
A gap is formed between the convex portion and the concave portion ,
A plurality of the convex portions are formed at intervals in the axial direction,
The pipe joint , wherein the gap is formed between all the protrusions and the recesses engaged with the protrusions . An inner cylinder formed in a cylindrical shape;
An outer cylinder that is formed in a cylindrical shape and is relatively press-fitted and assembled to the outer side of the inner cylinder in the press-fitting direction along the axial direction with respect to the inner cylinder;
A convex portion formed on any one of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder;
And a concave portion formed on the other of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, which engages with the convex portion.
A gap is formed between the convex portion and the concave portion,
A plurality of the convex portions are formed at intervals in the axial direction,
The gap is at least the protrusion formed on the rearmost side in the press-fitting direction with respect to the other one of the inner cylinder and the outer cylinder in which the protrusion is formed among the plurality of protrusions. A tube fitting formed between a portion and the recess that engages the protrusion . An inner cylinder formed in a cylindrical shape;
An outer cylinder formed in a cylindrical shape and assembled to the outer side of the inner cylinder by press-fitting relative to the inner cylinder in a press-fitting direction along the axial direction;
A convex portion formed on any one of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder;
And a concave portion formed on the other of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder, which engages with the convex portion.
A gap is formed between the convex portion and the concave portion,
A plurality of the convex portions are formed at intervals in the axial direction,
The gap is formed on the most front side in the pressing-in direction with respect to at least one of the plurality of the convex portions, the other of the inner cylinder and the outer cylinder in which the convex portion is formed. A tube fitting formed between a portion and the recess that engages the protrusion. The pipe joint according to any one of claims 1 to 3, wherein the gap is formed axially adjacent to the convex portion. The pipe joint according to any one of claims 1 to 4 , wherein the hardness of the outer cylinder is lower than the hardness of the inner cylinder. The outer cylinder is formed from a resin material,
The pipe joint according to any one of claims 1 to 5 , wherein the inner cylinder is formed of a metal material.

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