JP2000310384A - Pipe coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a pipe coupling even from resin material, and prevent a locking piece claw part of a collet ring from eating into the outside of the pipe more than required or slipping out by fitting a projecting part formed on the outside of the tip side of the collet ring locking piece to a recessed part formed in the tapered inner surface of a coupling main body. SOLUTION: A coupling main body 10 is formed by a connecting cylinder part 11 and a tapered sleeve 13. In the tapered sleeve 13, a tapered inner surface 40 for pressing an insert part 36 to an engagement piece 38 from the outside to reduce diameter, which is increased in diameter toward the deepest side. The taper inner surface 40 has a recessed part 41 on the rear end side. The collet ring 34 is cylindrical and the insert part 36 is divided into plural parts in the circumferential direction to form plural locking pieces, and a claw part 46 eating into the outer wall of the inserted pipe 42 is projected inside the locking piece 38. Further, a projecting part 52 fitted to the recessed part 41 of the tapered inner surface 40 is formed on the rear side of the tip part 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe joint, and more particularly, to a pipe joint for connecting a pipe for flowing a fluid such as air.

[0002]

2. Description of the Related Art The background art of the present invention is proposed by the present applicant and disclosed in Japanese Patent Application Laid-Open No. 8-178157. This background art has the following configuration as shown in FIGS. (FIG. 6 shows a state where a tube is not inserted above the center line, and shows a state where a tube is inserted below the center line. FIG. 7 shows a part of the embodiment of FIG. 10 is an exploded perspective view in which is cut away.) Reference numeral 10 denotes a joint body, which is basically provided in a tubular shape so that a pipe can be inserted. The joint main body 10 is formed by joining the connection cylinder 12 and the guide cylinder 14.
The guide cylinder 14 is attached to the sleeve 20 of the connection cylinder 12.
The outer fitting portion 30 is fitted, and the inner protruding portion 32 is locked and joined to the circumferential groove 22. 34 is a collet ring,
The pipe 42 has a basically cylindrical shape into which the pipe 42 can be inserted, and the joint body 10
One end side is inserted into the joint body 10 so as to be movable in the axial direction, and the insertion portion 36, which is a portion inserted into the joint body 10, is formed on a plurality of locking pieces 38 which are divided into a plurality in the circumferential direction. In addition, a claw portion 46 that protrudes into the outer wall of the tube 42 inserted into the inside of the locking piece 38 is provided in a protruding manner. Reference numeral 40 denotes a tapered inner surface, which is formed on the inner wall of the joint main body 10 and, when the collet ring 34 is moved in the pulling-out direction, comes into contact with the locking pieces 38 of the insertion portion 36 from the outside to reduce the diameter of the insertion portion 36. The diameter is increased in the depth direction in the joint body 10 to be guided as described above.
Numeral 64 denotes an elastic ring, which is fitted in the joint body 10 and seals between the inner peripheral surface in the joint body 10 and the outer peripheral surface of the pipe 42 to be inserted. When it becomes, it moves in the pulling-out direction of the tube 42.

An intermediate ring 54 is fitted between the collet ring 34 and the elastic ring 64 in the joint body 10 so as to be movable in the axial direction, and is provided in a ring shape through which the pipe 42 can be inserted. When the collet ring 34 is pushed in, it comes into contact with the distal end portion 48 of each locking piece 38 to guide the locking piece 38 to warp outward, and when the collet ring 34 is pressed and moved in the pulling direction by the elastic ring 64. In order to guide each locking piece 38 between the tapered inner surface 40 and the inner surface of the tapered inner surface 40 so as to bend inward, the locking piece 38 is opposed to the tapered inner surface 40 at an angle larger than the taper angle of the tapered inner surface 40, and A tapered outer surface 56 that expands in the lateral direction is provided. When each locking piece 38 warps inward on the inner peripheral edge of the tapered outer surface 56 so as to prevent each locking piece 38 from warping more than a predetermined amount. The locking piece 3 There comprises an inner circumferential locking part 68 abutting. The movement of the elastic ring 64 prevents the collet ring 34 from moving more than a predetermined amount in the pull-out direction via the intermediate ring 54, thereby preventing each locking piece 38 from warping more than a predetermined amount. In addition, a locking portion may be formed on the inner wall of the joint body 10 so as to abut against the outer peripheral edge of the intermediate ring 54 and prevent the intermediate ring 54 from moving in a drawing direction of the pipe 42 beyond a predetermined position. . Also, 18
Is a thread portion, which is provided on the side of the joint body 10 opposite to the side where the pipe 42 is inserted in order to connect the pipe joint itself to another passage. Reference numeral 24 denotes a hexagonal bolt formed in a head shape.

According to this pipe joint, the pipe 42 is connected to the joint body 1.
After being inserted into the tube 0, the tube 42 moves in a slightly withdrawing direction together with the collet ring 34, so that the claw portion 46 of the collet ring can be prevented from getting into the outer wall of the tube 42 and coming out of the tube 42. The movement of the collet ring 34 in the direction of exiting from the inside of the joint body 10 is achieved by the elastic ring 64 which moves in the direction of exiting from the inside of the joint body 10 by the action of the high pressure when the inner side of the pipe joint is at a high pressure.
Is also performed by pressing the collet ring 34. Further, by pushing the collet ring 34, the locking piece 36 is opened, the biting of the claw portion 46 into the tube 42 is released, and the tube 42 can be withdrawn.

[0005] According to the pipe joint of the present invention, the collet ring 34 in which the claw portion 46 is inserted into the outer wall of the tube 42 to connect the tube 42 to the inside, and the claw portion 46 is inserted into the outer wall of the tube 42. The joint body 10 having a tapered inner surface 40 acting to cause the engagement, an elastic ring 64 which seals the pipe 42 and is movable in the axial direction, and a tapered outer surface 56 which acts to release the lock by the claw portion 46 are formed. Intermediate ring 5 provided
4. As described above, since the function of attaching and detaching the pipe 42 to and from the joint body 10 is suitably dispersed in each member, the shape of each member can be simplified. Therefore, it is possible to facilitate the manufacture of the pipe joint, and it is particularly advantageous that the manufacture can be easily performed using a metal material. In addition, the intermediate ring 54 is provided with an inner peripheral locking portion 68 that acts to restrict the inward movement of the claw portion 46, and the inward movement of the claw portion is also preferable without complicating the shape. And the pipe can be prevented from being deformed more than predetermined.

[0006]

However, in the pipe joint of the background art described above, since the tapered inner surface 40 is merely a sloping surface, the locking piece 38 is slippery, and the pressure of the pressure device to which the pipe joint is connected is increased. The collet ring 34 and the tube 42 held by the collet ring 34 reciprocate in the insertion / removal direction of the tube 42 in response to the pulsation of the change. For this reason, there is a problem that the sealing state by the elastic ring 64 becomes unstable and the sealing performance is reduced. Further, the inner ring 54 is provided with an inner circumferential locking portion 68 so as to prevent each locking piece 38 from warping inward more than a predetermined amount. The inner circumferential locking portion 68 is made of a resin material. It is difficult to mold with sufficient strength. In particular, in a small-diameter pipe joint, since the space is limited, the thickness of the inner peripheral locking portion 68 cannot be increased to obtain a sufficient shape strength. Therefore, the pipe joint of this background art has a problem that it is difficult to mold it with plastic (resin) using a mold.

Accordingly, an object of the present invention is to provide a pipe joint which is easy to manufacture even with a resin material, and which can prevent a claw portion from being unnecessarily inserted into an outer wall of a pipe and a collet ring from coming off, and can improve sealing performance. Is to provide.

[0008]

To solve the above-mentioned problems, the present invention has the following arrangement. In other words, the present invention provides a joint body into which a pipe can be inserted, and an insertion portion which is basically cylindrical and into which the pipe can be inserted, and which is one end side inserted movably in the axial direction into the joint body, A collet ring formed on a plurality of locking pieces divided into a plurality in the circumferential direction and having a claw portion projecting into an outer wall of a pipe inserted inside the locking piece; Formed on the inner wall, when it moves in the direction of pulling out the collet ring, it comes into contact with the locking piece of the insertion portion from the outside and guides the insertion portion to reduce its diameter, so as to guide the insertion portion in the depth direction inside the joint body. When the inner surface of the taper that expands in diameter and the inner surface of the fitting that is fitted in the joint body and the outer surface of the inserted tube are sealed, and the inner side of the joint body has a high pressure, An elastic ring that moves in the direction in which the pipe is pulled out, and the collet in the joint body. A ring is provided between the ring and the elastic body ring so as to be movable in the axial direction, and is provided in a ring shape through which a tube can be inserted. When the collet ring is pushed in, it comes into contact with the tip of the locking piece. In order to guide the engaging piece so as to warp outward by contact with the engaging piece, and when the elastic piece is pressed and moved in the pulling direction, the engaging piece is sandwiched between the inner surface of the taper and guided so as to warp inward. An intermediate ring having an angle larger than the taper angle of the inner surface of the taper and facing the inner surface of the taper and having a tapered outer surface expanding in the depth direction in the joint body, wherein the collet ring has a predetermined position. In order to prevent the pipe from moving in the drawing direction as described above and to prevent the locking piece from warping inward more than a predetermined amount, a concave portion of the tapered inner surface formed on the tapered inner surface; Is formed on the outside of the distal end side of the locking piece, the pipe joint characterized in that it comprises a convex portion of the fitting in the recess of the tapered inner surface circle so provided was locking piece.

Further, since the joint body, the collet ring, and the intermediate ring are all formed of a resin, the joint body, the collet ring, and the intermediate ring can be suitably used in a technical field in which extremely small amount of metal contamination is a problem.

[0010] In addition, a diameter-expanding step is formed at a distal end portion of the joint body opposite to a portion connected to the pipe by the collet ring so as to be connected to another communication portion so as to form a stepped portion. Portion, and the enlarged diameter stepped portion is provided with a locking portion in which a slit is formed so as to be reduced in diameter, and another communication passage is provided on the side connected to the pipe by the collet ring with respect to the locking portion. And the step portion is formed so as to be sealable via a ring-shaped seal member, so that the pipe joint itself can be connected to another communication path,
It can be easily connected only by the insertion operation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 are sectional views showing one embodiment of the pipe joint according to the present invention. 1 shows a state in which a pipe such as a pneumatic resin tube is inserted into the pipe joint, FIG. 2 shows a state in which the pipe is connected and locked by the pipe joint, and FIG. 3 shows a state in which the pipe connection by the pipe joint is released ( Release). Reference numeral 10 denotes a joint body, which is composed of a connection cylinder 11 and a tapered sleeve 13, and has a flow path 16 penetrating therein in the axial direction. The connecting cylindrical body portion 11 includes a cylindrical side peripheral wall 11a into which the pipe 42 can be inserted.
Are provided with openings 11b at a plurality of locations (two locations in this embodiment). The tapered sleeve 13 is a tubular member that fits inside the tubular side peripheral wall 11a of the connection tubular body 11. A protrusion 13a protruding from the outer periphery of the tapered sleeve 13 fits into the opening 11b of the connection tubular body 11,
The connection cylinder 11 and the tapered sleeve 13 are integrated. That is, the taper sleeve 13 is inserted and fixed in the pipe connection port of the cylindrical side peripheral wall 11a, and the joint body 10 is formed. In order to reliably integrate the connection cylinder 11 with the tapered sleeve 13, the connection cylinder 11 is press-fitted.
The tapered sleeve 13 may be internally fitted to the tape, or both may be welded. It should be noted that the joint main body 10 is formed by connecting the connecting cylinder 11 and the tapered sleeve 13 as in this embodiment.
The division into parts is convenient for molding by a mold, and it is a matter of course that the division form can be selectively designed in various ways. Further, the joint body 10 may be formed integrally depending on the connection form with other communication passages.

Further, in the present embodiment, the joint body 10 (connecting tubular body 11) can be connected to another communication passage with one touch on the opposite side (tip side) of the portion connected to the pipe 42. , An engaging portion 17 is provided. In addition, this engaging portion 1
In FIG. 7, a diameter-enlarging step 70 is formed to form a step by expanding the diameter, and the diameter-enlarging step 70 can be reduced in diameter by a slit 71 (in this embodiment, a position symmetrical with respect to the circumference by 180 degrees). Are formed. Reference numeral 72 denotes a stepped portion, which is provided on the connection side of the pipe 42 in which the collet ring 34 described later is disposed, rather than the engagement portion 17, with another communication path and a ring-shaped sealing material (for example, an 'O'-ring). 74) is formed so as to be airtight (sealable). According to this, the pipe joint has a simple shape and is easy to manufacture, and the pipe joint itself can be easily and suitably connected to another communication passage only by the insertion operation.

The internal shape of the connecting cylindrical body 11 serving as the flow path 16 is such that the diameter of the connecting cylindrical body 11 is roughly increased in three stages from the engagement portion 17 side to the end of the cylindrical side wall 11a on the pipe connection port side. It has a first stepped portion 26 whose diameter is enlarged in the first stage, a second stepped portion 28 whose diameter is enlarged in the second stage, and a third stepped portion 29 which is enlarged in the third stage. . The first step 26 is formed by the pipe 4
In order to regulate the insertion depth of No. 2, it is a portion that can abut on the end face of the pipe 42 to be inserted. Also, the second step portion 28
Is a stopper for defining a position in the depth direction of an elastic ring 64 described later. Also, the second
The step portion 28 is a stopper portion for defining a position in the depth direction of the intermediate ring 54 described later.

The tapered sleeve 13 has an inner wall which, when moved in a direction in which a collet ring 34 to be described later is pulled out, comes into contact with a locking piece 38 of the inserted portion 36 from outside to reduce the diameter of the inserted portion 36. A tapered inner surface 40 that expands (expands) in the depth direction in the joint body 10 that guides the inner surface is formed. The tapered inner surface 40 also expands in the sense of allowing the locking piece 38 to warp outward so that the insertion portion 36 expands in diameter when the collet ring 34 is pushed into the inner side of the joint body 10. We are open. On the rear end side of the tapered inner surface 40, a concave portion 41 of the tapered inner surface formed in a concave shape is provided. That is, the most distal end portion, which is a portion inserted into the tapered sleeve 13 at the back side of the connection cylindrical body portion 11, is formed on the tapered inner surface 40. In this embodiment, the tapered inner surface 40 is continuous with the tapered inner surface 40.
On the rear end side (the side of the insertion opening into which the tube 42 is inserted), a concave portion 41 having a tapered inner surface is provided. The function and effect of the concave portion 41 on the inner surface of the taper will be described later. In the present embodiment, the connection cylinder 11 and the tapered sleeve 13 are made of a resin material molded by a resin mold. The connecting tubular portion 11 and the tapered sleeve 13 are basically shaped so as to gradually increase in diameter to one side, so that a resin mold can be manufactured relatively easily, and manufacturing costs can be reduced. Of course, it may be formed of a metal material.

Reference numeral 34 denotes a collet ring, which has a basically cylindrical shape into which the pipe 42 can be inserted, and has one end (insertion portion 36) inserted into the joint body 10 so as to be movable in the axial direction. Are formed on a plurality of locking pieces 38 which are divided into a plurality in the circumferential direction (four in this embodiment). On the inner side of the locking piece 38, a claw portion 46 is formed to protrude into the outer wall of the inserted tube 42. The claw portion 46 is to be inserted into the outer wall of the tube 42 to prevent the tube 42 from coming off.
As shown in the figure, the tip is formed sharp, and the plane shape is formed in an arc shape following the outer wall shape of the tube 42,
In this embodiment, although not shown, two locking pieces are provided on each locking piece 38. In this manner, by providing the locking piece 38 and the claw portion 46 in a divided manner, a balanced and reliable connection can be achieved.

The distal end portion 48 of the locking piece 38 is formed in a shape protruding outward (outward) as compared with the straight portion 50 on the rear side. The tip of the tip 48 is the claw 4
6, and has an R-shaped curved surface 58 (see FIG. 4) provided so as to abut on a tapered outer surface 56 of an intermediate ring 54 described later. On the rear side of the distal end portion 48, a convex portion 52 of an R-shaped locking piece that is opposed to and contacts the tapered inner surface 40 is formed. The projection 52 of the locking piece formed on the outer side of the distal end side of the locking piece 38 fits into the concave portion 41 of the tapered inner surface formed at a predetermined position on the tapered inner surface 40, so that the collet ring 34 is formed. It is possible to prevent the tube 42 from moving beyond the predetermined position in the pulling-out direction, and prevent the locking piece 38 from warping inward beyond a predetermined position. As described above, the concave portion 41 on the inner surface of the taper and the convex portion 52 on the locking piece allow the pipe 4 such as a resin tube in the one-touch fitting according to the present invention to be used.
The lock mechanism for inserting and fixing 2 is configured.

The surface of the tapered inner surface on the distal end side of the concave portion 41 is a plane substantially parallel to the axis of the pipe joint itself and the inserted tube. That is, the recess 4 on the inner surface of the taper
A part of 1 is not inclined with respect to the direction of the axis which is the insertion / removal direction of the tube 42. Therefore, when the projection 52 of the locking piece is fitted in the recess 41 of the inner surface of the taper, the locking piece 38 is held in a non-slip state, and pulsation due to pressure fluctuation of the connected pressure device. Works,
Reciprocal movement (chattering or the like) of the collet ring 34 in the axial direction can be suitably suppressed. By suppressing the movement of the collet ring 34 as described above, the movement of the pipe 42 is suppressed, the sealing state by the elastic ring is appropriately maintained, and the sealing performance of the pipe joint can be improved. Further, when the projection 52 of the locking piece fits into the recess 41 of the inner surface of the taper, there is a click feeling, and the user can suitably confirm that the connection of the tube 42 has been securely made and locked. There is also.

The collet ring 34 is connected to the joint body 10
The insertion portion 36 is pressed into the inner side of the joint body 10, and is inserted into the joint body 10 by utilizing the elasticity of the locking piece 38. In other words, the insertion portion 36 is reduced in diameter by the inward bending of each locking piece 38 at the cylindrical opening 60 of the tapered sleeve 13 so that the insertion portion 36 can enter the tapered sleeve 13, and reaches the position where the distal end portion 48 faces the tapered inner surface 40. The diameter of the collet ring 34 is increased by being inserted, whereby the collet ring 34 is inserted into the joint body 10. In the present embodiment, the locking piece 38 is formed by dividing the front end portion (insertion portion 36) into four equal parts in the circumferential direction as described above, and the rear end portion of the collet ring 34 has a flange-shaped flange. It is formed on the portion 62.

Incidentally, the collet ring 34 is integrally formed with the structure of the locking piece 38, the flange portion 62 and the like. Therefore, in manufacturing, a synthetic resin material such as an engineering plastic or a metal material may be used to integrally mold with a mold. When molding a synthetic resin material, use a material having a certain strength and durability, such as a reinforced plastic mixed with a reinforcing fiber, so that the claw portion 46 can be suitably inserted into the outer wall of the tube 42 and prevented from falling off. Can also. When the collet ring 34 is formed of a synthetic resin material, a claw-shaped member made of metal may be embedded in the claw portion 46 so that the claw ring 46 can be securely inserted into the outer wall of the tube 42. In addition, since the shape of the collet ring 34 is not relatively complicated, it can be relatively easily formed from a metal material.

Reference numeral 64 denotes an elastic ring, which is formed of an elastic material such as synthetic rubber and is fitted into the joint body 10 to seal between the inner peripheral surface of the joint body 10 and the outer peripheral surface of the pipe 42. . The elastic ring 64 can move in the direction in which the pipe 42 is pulled out when the inner side of the joint body 10 has a high pressure.
Further, the elastic body ring 64 may be fitted inside the joint body 10 before the connection tubular body 11 and the tapered sleeve 13 are connected. Specifically, the elastic ring 64 is expanded on the opening end side of the connection tubular body 11. It is fitted in the diameter part 66. The elastic ring 64
Is received by the second step portion 28 and is regulated so as not to move to a depth side of the joint body 10 beyond a predetermined position.

An intermediate ring 54 is fitted between the collet ring 34 and the elastic ring 64 in the joint body 10 so as to be movable in the axial direction, and is provided in a ring shape through which the pipe 42 can be inserted. . The intermediate ring 54 has a tapered outer surface 56 facing the tapered inner surface 40 at an angle larger than the taper angle of the tapered inner surface 40 and expanding in the joint body 10 in the depth direction. According to the tapered outer surface 56, when the collet ring 34 is pushed in, it can be guided to contact the end surface (curved surface 58) of the distal end portion 48 of the locking piece 38 to warp the locking piece 38 to the outside. When the intermediate ring 54 is pressed and moved by the body ring 64 in the pulling-out direction, the locking piece 38 can be sandwiched between the tapered inner surface 40 and guided inward. Reference numeral 69 denotes an outer peripheral edge, which is formed in a flange shape on the outer periphery of the intermediate ring 54. The outer peripheral edge 69 is received by the third step portion 29, and the intermediate ring 54 is regulated so as not to move to the inner side of the joint body 10 beyond a predetermined position. This intermediate ring 5
Reference numeral 4 denotes a relatively simple shape, which can be easily molded with a mold using a synthetic resin material such as engineering plastic or a metal material.

Reference numeral 75 denotes a screw main body. The engaging portion 17 of the joint main body 10 is fitted inside in a state sealed with an 'O'-ring 74 therebetween. A screw portion 76 (male screw) for screwing to a screw (not shown) or the like is formed. In the present embodiment, the “O” − is provided between the step 77 formed on the screw body 75 and the step 72 of the engagement section 17.
The engagement portion 17 is fitted into the screw body 75 with the ring 74 interposed therebetween, and the joint body 10 is connected and fixed to the screw body 75. The outer portion of the portion where the step 77 for receiving the 'O'-ring 74 is formed has a shape corresponding to a hexagonal bolt head 78.

The screw body 45 can be made of a metal material formed by cutting, for example, brass having good machinability or stainless steel having corrosion resistance.
As long as the specifications such as strength enough to withstand the use conditions are provided, a synthetic resin material (resin material) may be used.
Further, in the present embodiment, the screw portion 76 is added to the joint main body by the separate screw main body 75, but the present invention is not limited to this, and the engaging portion 17 as in this embodiment is used as a component. Instead, the screw portion 76 may be formed integrally with the joint body 10. That is, means for connecting the pipe joint itself to other communication passages is not particularly limited, and various connecting means may be selectively used as appropriate.

Next, the case of using the pipe joint having the above-described configuration will be described. As shown in FIG. 1, when the pipe 42 is inserted into the joint body 10 (collet ring 34), the pipe 42 separates the locking piece 38 of the collet ring 34 from the outer wall surface of the pipe 42 while resisting its elastic force. Move while spreading. Then, the pipe 42 is inserted to a predetermined position where the tip thereof comes into contact with the first step portion 26 provided inside the connection tubular body portion 11, and is pulled out slightly in the pulling-out direction to be prevented from falling off. More specifically, when the tube 42 is pulled from the insertion position, the collet ring 34 moves rearward together with the tube 42, and the distal end portion 48 is guided by the tapered inner surface 40, and each locking piece 38 warps inward. 36
Is reduced in the radial direction, the claw portion 46 enters the outer wall of the inserted tube 42, and the tube 42 is attached to the pipe joint.

Then, as shown in FIG.
When the elastic ring 64 is moved in the direction in which the tube is pulled out due to the high pressure on the inner side, the elastic ring 64 presses and moves the intermediate ring 54 in the direction in which the tube is pulled out. When the intermediate ring 54 is pressed and moved in the pulling-out direction in this manner, the distal end portion 48 of the locking piece 38 becomes tapered outer surface 56.
And the tapered inner surface 40, a force acts as indicated by the vector in FIG. 4, and the distal end portion 48 of the locking piece 38 slides inward. Specifically, the reaction force acting on the distal end portion 48 pinched between the tapered outer surface 56 and the tapered inner surface 40 includes a reaction force F1 acting on the tapered outer surface 56 and a reaction force F2 acting on the tapered inner surface 40 And are equal. Then, the reaction force F1 is applied to the tapered inner surface 4 with respect to the component force F3 acting in parallel to the tapered outer surface 56.
The component force F4 acting in parallel with 0 is larger. Also, the component force F5 of the component force F4 parallel to the component force F3 is clearly larger than the component force F3. Therefore, if the elastic ring 64 is moved in the pulling-out direction of the pipe, the locking piece 38 moves in the pulling-out direction along the tapered inner surface 40 and simultaneously warps inward, so that the locking piece 38 is moved to the outer wall of the pipe 42 in which the claw portion 46 is inserted. It is possible to prevent the tube 42 from slipping out. This is because the reaction forces F1 and F2 act in the axial direction, and the tapered outer surface 56 expands in the joint body 10 in the depth direction at an angle larger than the taper angle of the tapered inner surface 40. Therefore, the connection force of the pipe joint to the pipe 42 becomes stronger as the inner side of the joint body 10 becomes higher in pressure.

The tip 4 of the locking piece that moves inward
8 is locked by the projection 52 of the locking piece being fitted into the recess 41 of the inner surface of the taper, and the pipe 42 of the collet ring 34 is locked.
Is prevented from moving in the pulling-out direction, and the locking piece 38 is prevented from warping inward. This allows
The pipe 42 is prevented from being deformed more than predetermined, and
It is possible to prevent deterioration of the sealing performance of the connection between the two and prevent an increase in the resistance of the fluid flowing through the pipe 42. Further, the claw portion 46 is inserted into the tube 42 more than necessary, and the insertion portion 36 inserted into the joint body 10 of the collet ring 34 is inserted.
Can be prevented from being excessively reduced in diameter, and the collet ring 34 and the tube 42 can be prevented from coming out in an integrated state. Further, as described above, the pulsation of the collet ring 34 and the tube 42 is prevented, and a click feeling at the time of locking can be obtained.

Next, when the attached pipe 42 is detached from the pipe joint 10, as shown in FIG.
Is pushed into the joint body 10, the curved surface 58 of the distal end portion 48 of the locking piece 38 comes into contact with the tapered outer surface 56 of the intermediate ring 54, and the locking piece 38 is guided so as to warp outward. Thereby, the bite of the claw portion 46 into the outer wall of the tube 42 is released, and the tube 42 can be removed.

Although the above-described pipe joint of the above embodiment has been described as a straight pipe having an engaging portion 17 at one end side for mounting a pressure device, the overall shape of the pipe joint is limited to this. Never. That is, the configuration of the pipe joint of the present invention can be suitably applied to various types of pipe joints such as a relay pipe joint, an elbow, a T type, and a Y type.
As shown in FIG. 5, when the present invention is applied to an elbow type pipe joint, if the engaging portion 17 is provided on one end side of the elbow, the engaging portion 17 is simply inserted into a connected member such as the screw body 45. And the other end of the elbow (the connection side of the pipe) can be appropriately rotated about the axis of the engagement portion 17 in a state where the elbow is connected to the connected member by a seal. Therefore, the angle position on the connection side of the pipe of the elbow-shaped pipe joint with respect to the connected member can be easily adjusted, and the work of drawing and connecting the pipe can be facilitated.

Further, a configuration excluding the engaging portion 17 of the above embodiment (side peripheral wall of the connection cylinder portion, a tapered sleeve, a collet ring, an intermediate ring, and an elastic ring) is set, and the set is used as another fluid. It can also be used as a pipe joint which is externally fitted to a sleeve extending annularly at the passage connection port and connected by press fitting or caulking. As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and it goes without saying that many more modifications can be made without departing from the spirit of the invention. is there.

[0030]

According to the pipe joint of the present invention, the projection of the locking piece formed on the outer side of the distal end side of the locking piece fits into the concave portion of the tapered inner surface formed at a predetermined position on the tapered inner surface. The state in which the pipe is connected to the pipe joint so as to prevent the collet ring from moving beyond the predetermined position in the pipe withdrawing direction and prevent the locking piece from warping inward more than the predetermined position. Can be locked. The configuration of the concave portion on the inner surface of the taper and the convex portion of the locking piece is simple. With such a simple configuration, the lock mechanism for inserting and fixing the pipe in the one-touch fitting is preferably used. It has a significant effect that it can be configured. The shape of the components for forming the lock mechanism as described above can be made relatively simple and easy to mold, because a sufficient strength can be obtained even with a resin material. Therefore, a remarkable effect that the resin material can be suitably formed by the mold is also provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pipe joint according to the present invention.

FIG. 2 is a cross-sectional view showing a state where a pipe is connected and locked by a pipe joint.

FIG. 3 is a cross-sectional view showing a state in which a pipe connection by a pipe joint is released.

FIG. 4 is a principle explanatory diagram for explaining an operation principle of a locking piece of a collet ring.

FIG. 5 is a sectional view showing another embodiment of the pipe joint according to the present invention.

FIG. 6 is a cross-sectional view showing an example of a pipe joint of the background art.

FIG. 7 is an exploded perspective view illustrating a background art of FIG. 6 with a part cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Joint main body 11 Connection cylindrical body part 13 Tapered sleeve 34 Collet ring 36 Insertion part 38 Locking piece 40 Tapered inner surface 41 Concavity of taper inner surface 42 Pipe 46 Claw part 48 Tip part 52 Protrusion of locking piece 54 Intermediate ring 56 Tapered outer surface 64 elastic ring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J106 AA06 AB01 BA01 BB01 BC04 BD01 BE12 BE19 BE23 CA12 EA03 EB02 EC01 EC07 ED03 ED08 EE04 EF04 EF05

Claims (3)

[Claims] A joint body into which a pipe can be inserted, and an insertion part which is basically cylindrical and into which the pipe can be inserted, and which is one end side inserted into the joint body so as to be movable in an axial direction, has a peripheral portion. A collet ring formed on a plurality of locking pieces divided in a plurality of directions and provided with a claw projecting into an outer wall of a pipe inserted into the locking piece; and an inner wall of the joint body. In order to guide the insertion portion to be reduced in diameter by abutting against the locking piece of the insertion portion from the outside when the collet ring is moved in the pulling-out direction,
A taper inner surface that expands in the depth direction in the joint body; and a seal between the inner peripheral surface in the joint body and the outer peripheral surface of the inserted tube, which is fitted in the joint body, and An elastic ring that moves in the direction in which the pipe is pulled out when the back side of the pipe is at a high pressure; and a pipe that is fitted movably in the axial direction between the collet ring and the elastic ring in the joint body. It is provided in a ring shape that can be inserted, and when the collet ring is pushed in, it comes into contact with the tip of the locking piece and guides the locking piece to warp outward, and in the pulling direction by the elastic ring, At the time of being pressed and moved, the joint piece is opposed to the tapered inner surface at an angle larger than the taper angle of the tapered inner surface so as to guide the locking piece between the tapered inner surface and warp inward. Inside to expand the inner diameter An intermediate ring having an outer surface of the pipe, wherein the collet ring is prevented from moving in a pipe withdrawing direction beyond a predetermined position, and the locking piece is prevented from inwardly bending more than a predetermined position. A concave portion of the tapered inner surface formed on the tapered inner surface, and a convex portion of the locking piece formed outside the distal end side of the locking piece and provided to fit into the concave portion of the tapered inner surface. A pipe joint characterized by the above-mentioned. 2. The pipe joint according to claim 1, wherein the joint body, the collet ring, and the intermediate ring are all formed of resin. 3. An enlarged diameter step formed at an end portion of the joint body opposite to a portion connected to a pipe by the collet ring so as to be connected to another communication portion so as to form a stepped portion. And a connecting portion formed on the side connected to the pipe by the collet ring relative to the locking portion. The pipe joint according to claim 1 or 2, wherein a stepped portion is formed so as to be able to be sealed via the and a ring-shaped seal member.