KR20120110416A - Pipe joint - Google Patents

Abstract

PURPOSE: A pipe joint is provided to facilitate to insert a ring shaped member inward while inserting a connection pipe by adjusting the length of a bar shaped member. CONSTITUTION: A pipe joint(1) comprises an insertion checking unit(6). The insertion checking unit comprises a through hole(50), a groove portion(71), and an insertion checking member(8). The through hole penetrates the inner and outer surface of an outer cylinder body(5). The groove portion is extended to an axial direction from the through-hole and formed on the outer cylinder body. The insertion checking member formed into C-shape or O-ring shape and comprises a flexible bar shaped member(81) extended radially. The insertion checking member is inserted into the axial direction of a connection pipe by the front end of the connection pipe and then the bar shaped member is dragged into the groove portion of the outer cylinder body.

Description

Pipe joint {PIPE JOINT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting a connection pipe with one touch, which is provided with a connection pipe insertion checking means, and more particularly, an outer cylinder and an inner cylinder that form a receiving portion for receiving the connection pipe. In the pipe joint provided with the tube, the insertion and connection operation of the connection pipe is simple, and at the time of connection, the inserted connection pipe reaches the arbitrarily determined position in the pipe joint and is correctly connected. It relates to a one-touch type pipe joint having a dedicated connection pipe insertion check means that can be easily understood.

Conventionally, the pipe joint for connecting a connection pipe with one touch is known. For example, Unexamined-Japanese-Patent No. 4-18793 (patent document 1), Unexamined-Japanese-Patent No. 2001-193883 (patent document 2), and Unexamined-Japanese-Patent No. 2003-227592 (patent document 3) are concentric ( A cylindrical lock having projections such as teeth or projections for stopping the connecting tube between the inner cylinder disposed in the same state and the outer cylinder having a tapered surface axially facing the insertion hole. A one-touch joint is disclosed in which the ring is movably embedded in the axial direction. In this type of joint, the locking ring is moved near the insertion hole by inserting the connecting tube to the deepest part and then returning it. Then, the projection of the locking ring is reduced in diameter so as to enter the outer circumferential surface of the connection pipe by interaction with the tapered surface formed near the insertion port of the outer cylinder, thereby preventing the connection pipe from being pulled out.

Japanese Unexamined Patent Publication (Kokai) No. 2005-172218 (Patent Document 4) has substantially the same configuration as the pipe joints described in Patent Documents 1 to 3 above, but an inner cylinder for supporting a connecting tube inserted into the inside of the pipe joint from the inside. One-touch pipe joints of the type without the present invention are disclosed.

In addition, in WO2006 / 135227 (Patent Document 5), a modification other than the pipe joint described in Patent Documents 1 to 3 is described. In the one-touch pipe joint described in Patent Literature 5, both the outer sleeve and the inner sleeve have a tapered surface in the direction of narrowing the gap between the insertion openings, and have teeth and concentric so as to accommodate the connection pipe therebetween. A cylindrical locking ring composed of an outer grip ring and an inner grip ring arranged in the same manner, and a bottom portion connecting both grip rings at the deepest portion is arranged to be movable in the axial direction.

Moreover, as a one-touch type pipe joint other than the type which has the locking ring movable axially inside the pipe joint, Unexamined-Japanese-Patent No. 9-236190 (patent document 6) and Unexamined-Japanese-Patent No. 2006-118704 ( One-touch pipe joints as described in Patent Document 7) and Japanese Unexamined Patent Application Publication No. 2008-164074 (Patent Document 8) are known. The one-touch pipe joints described in Patent Documents 6 to 8 consist of an outer cylinder arranged concentrically and an inner cylinder extending from the joint body in order to form an accommodating portion for accommodating a connecting tube, and on the outer peripheral surface of the inner cylinder, An annular locking ring having a plurality of radially extending serrated teeth or projections is fixed to allow the inner circumferential surface of the connecting pipe to fall out.

Moreover, although it has a structure similar to the pipe joint described in the said patent document 6 and patent document 7, basically, Unexamined-Japanese-Patent No. 2002-106772 (patent document 9) and Unexamined-Japanese-Patent No. 2003-307290 (patent document 10) As described in, a one-touch pipe joint of a type in which an annular locking ring having a plurality of teeth or protrusions is fixed to enter the outer circumferential surface of the connection pipe from the inner circumferential surface of the outer cylinder, not from the outer circumferential surface of the inner cylinder. Also known.

In addition, the inventors of the present invention, as described in JP 2010-230094 (Patent Document 11) as an improved version of the pipe joint described in Patent Documents 1 to 10, in the radial direction in the connection pipe accommodating portion of the pipe joint A curved locking ring that deforms so as to extend in the axial direction when pressed toward the end, and when the connecting pipe is inserted, the free end of the locking ring having the protrusion is connected by interaction with the peripheral tapered wall. A patent application is filed for a one-touch pipe joint characterized in that the inner peripheral surface and / or the outer peripheral surface of the tube are displaced so as to be press-contacted.

The pipe joint is connected to the pipe joint in order to connect a tube such as a circular tube made of a plastic material or an aluminum three-layer tube having a structure in which the front and back surfaces of aluminum are made of a plastic material. It is necessary to return the pipe joint inserted to a predetermined position in the joint or to the position where the projection of the locking ring enters. If the inserted connection tube does not reach the predetermined position in the joint, the connection tube will easily cause a problem such as detaching from the joint or causing a seal failure with the joint.

However, in general, it is relatively easy to check whether the connection pipe is inserted into the pipe joint, but it is not easy to check whether the inserted connection pipe has reached a predetermined position. Therefore, the connecting operation is terminated before the inserted connecting tube reaches a predetermined position in the joint, or on the contrary, the connecting tube is subjected to excessive load to the deepest part in the joint or to the connecting tube, and they are destroyed. There was problem to be.

Moreover, in order to solve the above-mentioned problem, Unexamined-Japanese-Patent No. 11-132374 (patent document 12) as a means which makes it easy to confirm whether the inserted connection pipe reached | attained to the predetermined position in a joint. As described in the following, visually, a pipe joint of a type in which a confirmation hole or a transparent portion for confirming the tip position of a connecting tube in a connected state from the outside is provided in the outer cylinder of the joint is known. .

In addition, as a separate and dedicated connection tube insertion confirmation means, Japanese Patent Application Laid-Open No. H6-62292 (Patent Document 13), Japanese Patent Application Laid-Open No. 2001-324071 (Patent Document 14), and Japanese Patent Application Publication The rod-shaped insertion confirmation member, which is loosely fitted (slackly fitted) in the through-hole of the pipe joint outer cylinder described in 2002-89759 (Patent Document 15), is placed at the end of the inserted connection tube. The type of pipe joint which is pushed up by and protrudes out of the outer cylinder is known. In addition, the connection tube in which the seal ring which supports the rod-shaped insertion confirmation member which protrudes to the outside as described in Unexamined-Japanese-Patent No. 2009-19645 (patent document 16) from the inside of a pipe joint is inserted. As a result of the removal, a joint or the like of a type in which the insertion confirmation member having lost the support ring is immersed into the through hole from the outer circumferential surface of the outer cylinder is also known.

However, these types of pipe joints or connection pipe insertion confirmation means can only confirm whether the inserted connection pipe has reached or not at the position where the confirmation hole or the connection pipe insertion confirmation means is disposed, for example, It was not possible to confirm whether or not the connecting pipe had been reached at an arbitrarily determined position in the joint, such as the middle part of the part or the deepest part.

In addition, there is a problem in that, in the case of a pipe joint of a type that checks the insertion state of the connection pipe with the naked eye, it cannot function effectively in a dark place or a closed place. Moreover, in the case of a pipe joint of a type requiring a dedicated connection pipe insertion confirmation means, the protrusion value (protrusion height) to the outside of the insertion confirmation member or the immersion value into the inside of the through hole due to the structural constraint ), There is a problem that the operator cannot accurately check the uneven state of the insertion check member.

JP 4-18793 A Japanese Unexamined Patent Publication No. 2001-193883 Japanese Unexamined Patent Publication No. 2003-227592 Japanese Unexamined Patent Publication No. 2005-172218 WO2006 / 135227 Publication Japanese Patent Laid-Open No. 9-236190 Japanese Unexamined Patent Publication No. 2006-118704 Japanese Unexamined Patent Publication No. 2008-164074 Japanese Unexamined Patent Publication No. 2002-106772 Japanese Unexamined Patent Publication No. 2003-307290 Japanese Patent Laid-Open No. 2010-230094 Japanese Patent Laid-Open No. 11-132374 JP 6-62292 A Japanese Unexamined Patent Publication No. 2001-324071 Japanese Unexamined Patent Publication No. 2002-89759 Japanese Unexamined Patent Publication No. 2009-19645

Therefore, the present invention is intended to solve the problems described above, and its object is to simplify the insertion and connection operation of the connection pipe, and at the time of connection, the connection pipe inserted is arbitrarily determined in the joint. The present invention provides a one-touch joint with a dedicated connection tube insertion checking means capable of accurately and easily grasping whether or not it has reached the position.

Accordingly, the present inventors have repeatedly studied the one-touch pipe joint provided with a dedicated connection pipe insertion confirmation means. As a result, by placing a C-shaped ring or O-shaped part having a radially extending flexible rod-shaped member in the accommodating portion of the joint, and adjusting the length of the rod-shaped member, When the connecting tube is inserted, the ring-shaped part is pushed inward by the connecting tube, and the rod-shaped member preset in the through hole is drawn in from the outside of the outer cylinder to enter the length of the receiving portion of the joint. The pipe joint of the present invention, which can freely change the insertion confirmation position of the connecting pipe, has been completed.

That is, according to the present invention, a pipe joint including a joint main body, an outer cylinder and an inner cylinder forming a receiving portion for accepting a connection pipe, and a connection pipe insertion confirmation means for confirming the insertion state of the connection pipe. The insertion confirmation means includes a through hole penetrating the inner circumferential surface and the outer circumferential surface of the outer cylinder body, a groove portion extending from the through hole in the axial direction and formed on the inner circumferential surface of the outer cylinder body, and extending radially. And a C-shaped ring-shaped or O-shaped ring-shaped confirmation member which is arranged to be movable in the axial direction in the accommodating portion. It is arrange | positioned so that it may protrude from the inside of a through-hole to the exterior of the said outer cylinder, When the connecting pipe is inserted, the said rod-shaped member is the said insertion confirmation member, The said connection confirmation member As by the front end of the luggage and push toward the inner axial direction, the one-touch pipe joint of the formula, characterized in that from the outside of the outer cylinder into taken to be received in the groove portion formed on the inner peripheral surface is provided.

In the one-touch pipe joint provided with the exclusive connection pipe insertion confirmation means according to the present invention, the flexible rod-shaped member extending radially from the C-shaped ring or O-shaped ring confirmation member is inserted into the connection pipe. In the former initial state, it arrange | positions in the accommodating part of a pipe joint so that it protrudes outward from the through-hole of an outer cylinder. Therefore, normally, the insertion confirmation member connected with the rod-shaped member is disposed just below the through-hole of the outer cylinder, and the rod-shaped member is easily adjusted so that the operator can easily confirm the initial state before insertion of the connection pipe. The protrusion length from the outer circumferential surface of the outer cylinder can be freely changed.

On the other hand, when the connecting pipe is inserted into the receiving portion of the pipe joint, the insertion confirming member is brought into contact with the leading end of the connecting pipe, because it occupies all or part of the end face of the receiving portion, and is pushed to the deepest part of the receiving pipe fitting portion. Is put in. At this time, since the rod-shaped member is connected to the insertion confirmation member main body, the rod-shaped member is accompanied by the movement of the insertion confirmation member, and is drawn from the outside of the outer cylinder through the through hole and into the groove formed on the inner circumferential surface thereof. do.

For this reason, the operator can confirm the through-hole of the outer cylinder made into the empty space by using a time or a fingertip, and the inserted connection pipe reaches the predetermined position with respect to a pipe joint, and connection is completed. You can easily and accurately determine whether or not.

Thus, the connection pipe insertion confirmation means used by this invention is the length of a rod-shaped member, substantially the distance between the front end position of a connection pipe and the through-hole of an outer cylinder when connection of a connection pipe is completed. You can adjust it to be the same. Thereby, when the inserted connection tube reaches the position which completes the connection completely, the rod-shaped member is all formed in the inner peripheral surface of the outer cylinder through the through hole or through the through hole from the outside of the outer cylinder. Drawn into the groove and received. In this way, the pipe joint of the present invention adjusts the length of the rod-shaped member of the connection pipe insertion check means, thereby adjusting the insertion depth of the connection pipe to the length of the receiving portion of the pipe connection, that is, the insertion confirmation position of the connection pipe. You can change it freely.

Moreover, you may arrange | position a plurality of rod-shaped members with respect to the insertion confirmation member main body, In this case, it is necessary to form the through-hole corresponding to the number and position of a rod-shaped member in an outer cylinder.

In addition, the reason that the length of the rod-shaped member does not need to be exactly the same as the distance from the through hole to the distal end position of the connecting pipe is sufficient. This is because there are factors that cause errors such as elongation when the rod-shaped member is bent and drawn in, and curvature of the bent portion.

In the present invention, a groove is formed on the inner circumferential surface of the outer cylinder at least from the through hole toward the inner side in the axial direction. If the groove is not formed on the inner circumferential surface of the outer cylinder, the inner member of the outer cylinder and the outer circumferential surface of the connecting tube may cause the rod-shaped member to be drawn into the receiving portion with the insertion of the connecting tube to prevent further insertion of the connecting tube. It will result in a failure to be sandwiched or torn between.

In the present invention, the space formed between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the connecting tube in order to attract the rod-shaped member includes a gap formed by the diameter difference between the inner diameter of the outer cylinder and the outer diameter of the connecting tube. It does not use, but requires the formation of a groove portion different from that. The reason for this is that when the gap portion is used, rickety occurs due to the gap portion between the inserted pipe and the outer cylinder after insertion, and the connection pipe cannot be firmly fixed. On the other hand, when a groove is formed in a part of the inner circumferential surface of the outer cylinder, the inner diameter of the outer cylinder can be designed to be approximately the same size as the outer diameter of the connecting tube, so that the insertion and fixing of the connecting tube without rattling can be realized. have. Moreover, the inner diameter of an outer cylinder is set comparatively larger than the outer diameter of a connection pipe, and on the inner peripheral surface of an outer cylinder, it has an end part which ends substantially on the outer peripheral surface of a connection pipe from the inner peripheral surface of an outer cylinder. By providing a plurality of radially extending ribs, it is possible to prevent rattling and to form grooves for drawing rod-shaped members.

In addition, the groove portion of the outer cylinder has a larger inner diameter of the outer cylinder than the outer diameter of the connecting pipe, and has a slit extending in the axial direction and a sleeve having an inner diameter approximately the same as the outer diameter of the connecting pipe. It can also form. That is, the slit part after sleeve mounting forms a groove part on the inner peripheral surface of an outer cylinder.

The end face of a sleeve is O-shaped normally so that it may adhere on the inner peripheral surface of an outer cylinder. However, in the case of the present invention, when mounting the sleeve on the inner circumferential surface of the outer cylinder in consideration of the ease of mounting, it may be a C-shaped shape cut off a portion of the cross section so that the outer diameter can be small.

The use of the sleeve as described above improves the moldability of the outer cylinder and the mounting property of the internal parts such as the insertion check member, the locking ring, and the seal ring. In particular, in the case of a pipe joint of a type using a locking ring described later, a fixed wall parallel to the radial direction for restricting the movement in the axial direction of the locking ring can be easily formed on the inner circumferential surface of the outer cylinder.

In the present invention, the rod-shaped member is accommodated in the groove portion on the inner circumferential surface of the outer cylindrical body while being bent and deformed, accompanying the movement of the insertion confirming member in the axial direction. For this reason, it is preferable that the rod-shaped member and the insertion confirmation member including the same are made of a material which is flexible and resistant to tensile stress. Examples of such materials include thermoplastic elastomers, synthetic rubber or natural rubber. In particular, in the case of thermoplastic elastomers, since the elongation with respect to a certain load is generally smaller than that of synthetic rubber or natural rubber, the rod-shaped member is required to be bent and deformed while maintaining the length corresponding to the insertion confirmation position of the connection pipe. It is suitable as a material.

In addition, in order to obtain the high deformation | transformation characteristic of a rod-shaped member, it can also make it easy to bend by studying a shape, such as making the cross section into a flat shape. In particular, the rod-shaped member pulls in by forming a similar hinge structure having a smaller cross-sectional area than other portions, such as narrowing the cross-sectional area near the base of the ring-shaped insertion confirmation member main body or making the thickness thinner. Initial high bending characteristics can be obtained.

The shape of the tip of the rod-shaped member is not particularly limited, but in order to facilitate identification by the operator's finger or the like, the shape of the tip can be stimulated to a fingertip such as a sharp shape or a surface having irregularities. You can also do In addition, in order to improve the visibility by visual observation, the tip of the rod-shaped member or rod-shaped member may be colored with a noticeable color such as fluorescent color.

The one-touch type pipe joint having the exclusive connection pipe insertion checking means according to the present invention has the outer peripheral surface further having a fixed wall parallel in the radial direction and a tapered wall continuously expanding toward the outer side in the axial direction. A cylindrical body having a plurality of slits to form an inner cylinder and a free end of a cantilever, the first outwardly pressing the inner circumferential surface of the connecting tube by elastic deformation of the cylindrical body when the connecting tube is inserted. (External) It has a projection part and the 2nd outward projection part which is arrange | positioned at the said free end and stops the said connection pipe at the time of extracting the said connection pipe, and moves axially between the fixed wall and the tapered wall of the said inner cylinder. And an inner locking ring which is arranged to be capable of being disposed, and the inner locking when the connecting pipe is inserted to a predetermined position of the accommodation portion and then moved in the extraction direction. The first outwardly protruding portion is moved to the extraction direction together with the connecting pipe by being locked to the inner circumferential surface of the connecting pipe, the free end of the inner locking ring enters the tapered wall area of the inner cylinder, and the By interacting with the tapered wall, the inner locking ring can be configured to be enlarged to press-fit the second outward protrusion to the inner circumferential surface of the connection pipe.

In another aspect, the one-touch type pipe joint having the exclusive connection pipe insertion checking means according to the present invention has a fixed wall parallel in the radial direction and a tapered wall continuously reduced in the axially outward direction. A cylindrical body having a plurality of slits for forming the outer end of the tube and the free end of the cantilever beam, the first tube pressing the outer circumferential surface of the tube by elastic deformation of the tube when the tube is inserted; An inwardly projecting portion and a second inwardly projecting portion that is disposed at the free end and stops the connecting tube when the connecting tube is removed, and is axially movable between the fixed wall and the tapered wall of the outer cylinder. It further includes the outer locking ring arranged, and when the connection pipe is inserted to a predetermined position of the receiving portion, and moved in the extraction direction, the outer The locking ring is moved in the withdrawal direction together with the connecting pipe by the first inwardly protruding portion being locked to the outer circumferential surface of the connecting pipe, the free end of the outer locking ring enters the tapered wall area of the outer cylinder, and By interacting with the tapered wall, the outer locking ring may be configured to be reduced in diameter so as to press-contact the second inwardly projecting portion to the outer circumferential surface of the connection pipe.

In another aspect, the one-touch pipe joint having a dedicated connection pipe insertion confirmation means according to the present invention includes a fixed wall parallel in the radial direction and a tapered wall continuously expanding toward the outer side in the axial direction. A plurality of slits for forming the free end of the cantilever beam and the outer cylinder having an inner circumferential surface, the inner cylinder further having an inner diameter, a fixed wall parallel to the radial direction, and a tapered wall continuously reduced in the axially outward direction. A cylindrical body having a first outwardly projecting portion that presses the inner circumferential surface of the connecting tube by elastic deformation of the tubular body when the connecting tube is inserted, and the free end, and the connecting tube when the connecting tube is removed An inner lock having a second outwardly projecting portion for stopping the gap and movably disposed in the axial direction between the fixed wall and the tapered wall of the inner cylinder; A cylindrical body having a ring and a plurality of slits to form a free end of the cantilever, comprising: a first inwardly projecting portion that presses the outer circumferential surface of the connecting pipe by elastic deformation of the cylindrical body when the connecting pipe is inserted; An outer lock disposed at a free end and having a second inwardly projecting portion that stops the connecting pipe when the connecting pipe is pulled out, and is axially movable between the fixed wall and the tapered wall of the outer cylinder; The ring further includes a ring, and when the connecting pipe is inserted to a predetermined position of the receiving portion and then moved in the extraction direction, the inner locking ring is locked by the first outwardly protruding portion being locked to the inner circumferential surface of the connecting pipe. Moving in the extraction direction together with the connecting pipe, the free end of the inner locking ring enters the tapered wall region of the inner cylinder, and the tapered wall The inner locking ring is enlarged to press the second outward protrusion to the inner circumferential surface of the connection pipe, and the outer locking ring is fastened to the outer circumferential surface of the connection pipe. And the free end of the outer locking ring enters the tapered wall region of the outer cylinder, and by interaction with the tapered wall, the outer locking ring is connected to the second tube. The inwardly protruding portion may be configured to be reduced in diameter so as to be press-contacted to the outer circumferential surface of the connection pipe.

In the present invention, when using a pipe joint having a structure that further includes an inner locking ring and / or an outer locking ring as described above, the joint body, the inner cylinder, and the outer cylinder all have a cylindrical shape. Among them, the joint body may include an inner cylinder and may be molded integrally with the inner cylinder. In addition, the joint body and the inner cylinder have passage openings for flowing fluid therein, and the tip portion thereof is preferably in a funnel shape in order to reduce the resistance of the fluid. In addition, when importance is placed on productivity, cost, and the like of the pipe joint, the joint body, the inner cylinder, and the outer cylinder may be integrally formed with all of their parts.

If the outer cylinder of the pipe joint is of a type separate from the joint body, the outer cylinder may be improperly fitted (fit tightly) to the joint body, or loosely fitted (slack fitting) in a circumferential direction. It may be. When the outer cylinder is rotatably attached to the seam body, this type of pipe joint is relatively flexible to fracture stress because it can easily solve the bending stress and rotational moment that the connecting tube receives during or after connection. Can respond.

The material of the joint body, the inner cylinder and / or the outer cylinder is not particularly limited as long as it is relatively hard, but is preferably molded from a plastic material or a metal material. In particular, when molding from a plastic material, it is more preferable to use polyphenylsulfone (PPSU) resin or polyphenylene sulfide (PPS) resin as the material.

The joint body including the inner cylinder and the outer cylinder are arranged concentrically, and a receiving portion for accepting the connecting pipe is formed between the inner cylinder and the outer cylinder. And the accommodating part of a pipe joint has a 1st protrusion part which functions to press | press the main surface at the time of insertion of a connection pipe, and a 2nd protrusion part which functions to stop a connection pipe when it pulls out a connection pipe. The locking ring is arranged to be movable in the axial direction. The lock ring may be attached to either the outer circumferential surface of the inner cylinder or the inner circumferential surface of the outer cylinder. However, when one of the lock rings is broken due to falling of the pipe joint, adhesion of the solvent, or stepping on the connecting tube, It is desirable to arrange the locking rings on both sides so as to ensure the grip.

For this reason, in order to arrange | position an inner locking ring so that a movement is possible to an axial direction, the outer peripheral surface of an inner cylinder is provided with the fixed wall parallel to a radial direction, and the taper wall continuously expanded toward an axial direction outer side. Moreover, in order to arrange | position an outer locking ring so that an outer locking ring can move to an axial direction, the inner peripheral surface of an outer cylinder is provided with the fixed wall parallel to a radial direction, and the taper wall continuously axially toward an axial direction outer side. And the inner lock ring and / or the outer lock ring are arrange | positioned between the fixed wall and the taper wall, so that one end (fixed end) of the inner lock ring and / or the outer lock ring is the outer peripheral surface of the inner cylinder and / Alternatively, the movement in the axial direction is substantially limited by the relationship with the fixed wall of the inner circumferential surface of the outer cylinder, and the other end (free end) is allowed to move in the axial direction by the relationship with the tapered wall. For this reason, the fixed end of an inner lock ring and / or an outer lock ring is arrange | positioned inside an axial part rather than a free end, and the free end has a 2nd protrusion part for stopping a connection pipe when it pulls out.

The inner locking ring disposed on the outer circumferential surface of the inner cylinder is formed of a cylindrical body, and a plurality of slits are cut from the end of the cylindrical body so as to form a free end of the cantilever beam in the trunk portion. Further, the inner locking ring has a first outward protrusion functioning to press the inner circumferential surface of the connection pipe by elastic deformation when the connection pipe is inserted, and the free end functioning to stop the connection pipe when the connection pipe is removed. The 2nd outward protrusion part arrange | positioned at is provided.

The pressing function of the first outwardly projecting portion is that when the bulging portion of the inner locking ring has a shape such as a mesauring worm (looper) in its axial cross section, it is bent when pressed inward in the radial direction, and its reaction force The inner circumferential surface of the connecting pipe inserted in the reverse direction is properly pressed. In addition, since the slit extends in the axial direction to penetrate the body portion of the inner locking ring, each of the bulges divided by the slit facilitates elastic deformation without interfering with each other.

As a result, when the connecting pipe is inserted to the predetermined position of the receiving portion of the pipe joint and then moved in the pulling direction, the first outward protrusion stops on the inner circumferential surface of the connecting pipe, so that the inner locking ring also moves in the pulling direction together with the connecting pipe. Move. The free end of the inner locking ring enters the tapered wall region of the inner cylinder, and by interaction with the tapered wall, the inner locking ring is enlarged to press-fit the second outward protrusion to the inner circumferential surface of the connecting pipe.

In this type of pipe joint, the first outward protrusion is supported by the main body of the inner locking ring so as to press the inner circumferential surface of the inserted connection tube as appropriate, and the second outward protrusion is the insertion direction after inserting the connection pipe. When it does not move to, it retracts so that it may hardly contact with the inner peripheral surface, and is supported by the free end of an inner lock ring. When the connecting tube is inserted, the insertion resistance received by the connecting tube from the first outward protrusion is small, but when the connecting tube moves in the withdrawal direction, the connecting tube is secured by the interaction between the second outward protrusion and the tapered wall. Firmly hangs

On the other hand, the outer locking ring disposed on the inner circumferential surface of the outer cylinder is made of a cylindrical body, and a plurality of slits are cut from the ends of the cylindrical body to form a free end of the cantilever beam in the trunk portion. In addition, the outer locking ring has a first inward protrusion functioning to press the outer circumferential surface of the connection pipe by elastic deformation when the connection pipe is inserted, and the free end functioning to stop the connection pipe when the connection pipe is removed. A second inwardly projecting portion disposed on the substrate is provided.

The pressing function of the first inwardly protruding portion is curved when the concave portion (concave portion) of the outer locking ring has a axial cross-sectional shape, such as a beetle. The outer circumferential surface of the connecting pipe inserted into the pressure is appropriately pressed. Further, since the slit extends in the axial direction so as to penetrate through the body of the outer locking ring, it is easy for each of the narrowed portions divided by the slit to elastically deform without interfering with each other.

As a result, when the connecting pipe is inserted to a predetermined position of the receiving portion of the pipe joint and then moved in the pulling direction, the first inward protrusion stops on the outer circumferential surface of the connecting pipe, so that the outer locking ring is also pulled out together with the connecting pipe. Move. Then, the free end of the outer locking ring enters the tapered wall region of the outer cylinder, and by interaction with the tapered wall, the outer locking ring is reduced to press the second inwardly projecting portion to the outer peripheral surface of the connecting pipe.

In this type of joint, the first inward protrusion is supported by the main body of the outer locking ring so as to press the outer circumferential surface of the inserted connection tube appropriately, and the second inward protrusion is the extraction direction after the insertion pipe is inserted. When it does not move to the side, it retracts so that it may hardly contact with the outer peripheral surface, and is supported by the free end of an outer lock ring. And when the connection tube is inserted, the insertion resistance received by the connection tube from the first inward projection is small, but if the connection tube moves in the withdrawal direction, the connection tube is secured by the interaction between the second inward projection and the tapered wall. Firmly hangs

When using both an inner lock ring and an outer lock ring together, you may arrange | position so that a 1st outward protrusion part of an inner lock ring and a 1st inward protrusion part of an outer lock ring may press a connection pipe in a different position in an axial direction, Or you may arrange so that a connection pipe may be pressed in the position which mutually opposes. In addition, similarly to the first outward and inward projections, the second outward projection of the inner locking ring and the second inward projection of the outer locking ring may be arranged to stop the connecting pipe at different positions in the axial direction, or mutually. You may arrange | position so that a connection pipe may be stopped in an opposing position.

However, the application range of the connection pipe insertion confirmation means used in the present invention is not limited to the type of pipe joint having the inner lock ring and / or the outer lock ring as described above. For example, the inner circumferential surface or the outer circumferential surface of the connecting tube may be formed on the outer circumferential surface of the inner cylinder or the inner circumferential surface of the outer cylinder, including an outer cylinder arranged concentrically to form a receiving portion for receiving the connecting tube, and an inner cylinder extending from the joint body. A pipe joint of a type in which an annular locking ring having a plurality of teeth or protrusions extending radially is fixed for entering, a concentric inner cylinder, and a tapered surface axially facing the insertion hole Insertion pipe of the present invention, such as a pipe joint of a type in which a cylindrical lock ring having projections such as teeth or projections for stopping the connection pipe is movably built in the axial direction between the outer cylinder. The identification means can be applied to any type of joint, regardless of the type of the locking ring. Moreover, if the accommodating part of a connection pipe is formed by an outer cylinder and an inner cylinder, it is applicable also to the pipe joint of the type which does not have a locking ring inside.

The pipe joint according to the present invention preferably includes at least one seal ring for sealing the gap with the connecting pipe on the outer circumferential surface of the inner cylinder and / or the inner circumferential surface of the outer cylinder. The seal ring is generally fixed by forming a groove on the outer circumferential surface of the inner cylinder and / or the inner circumferential surface of the outer cylinder and accommodating therein. Moreover, the cross-sectional shape is not specifically limited, The seal ring which has various cross-sectional shapes, such as O shape, a square shape, a recessed shape, and a lip shape, can be employ | adopted.

In particular, in the case of a pipe joint of a type having an inner locking ring and / or an outer locking ring as described above, a pipe of a type having a conventional joint locking ring or a ring of an annular locking ring fixed therein Like the joint, when the connecting tube is inserted, the inner circumferential surface or the outer circumferential surface of the connecting tube is hardly deeply damaged by the projection of the locking ring, so that a high seal effect can be obtained.

According to another aspect of the present invention, there is provided a seam body, an inner cylinder extending from the seam main body toward the outer side in the axial direction, a through hole penetrating the inner and outer circumferential surfaces, and a groove portion extending in the axial direction from the through hole on the inner circumferential surface. And an outer cylinder disposed outside the inner cylinder and forming an accommodating portion for receiving the connecting tube between the inner cylinder and an inner circumferential surface and / or an outer circumferential surface of the connecting tube inserted into the accommodating portion. C-shaped ring or O which has a locking ring which prevents the connection pipe from being pulled out by press-contacting a sharp projection, and a flexible rod-shaped member extending radially, and axially movable in the receiving portion. It is composed of a ring-shaped insertion check member, and before inserting the connecting pipe, the rod-shaped member is disposed outside the outer cylinder from within the through hole. The rod-shaped member is formed on the inner circumferential surface from the outside of the outer cylinder by being pushed inwardly in the axial direction by the distal end of the connecting tube when the connecting tube is inserted. One touch, characterized in that the insertion confirmation position of the connection pipe with respect to the length of the receiving portion of the pipe joint can be freely changed by being drawn in to be accommodated into the groove, and by adjusting the length of the rod-shaped member of the insertion confirmation member. A pipe joint of the formula is provided.

Also in this type of one-touch pipe joint, the flexible rod-shaped member which extends radially from the C-shaped or O-shaped insertion confirmation member is external from the through-hole of the outer cylinder in the initial state before the connection tube is inserted. It is arranged in the receiving portion of the pipe joint so as to protrude. Therefore, normally, the insertion confirmation member is connected to the rod-shaped member, and is disposed just below the through-hole of the outer cylinder, and the rod-shaped member adjusts the length thereof so that the operator can easily facilitate the initial state before the insertion pipe insertion. The protruding length from the outer circumferential surface of the outer cylinder can be freely changed to confirm.

On the other hand, when the connecting pipe is inserted into the receiving portion of the joint, the insertion confirming member occupies all or part of the end face of the receiving portion, so that it is contacted by the distal end of the connecting tube, and is pushed to the deepest part of the connecting joint receiving portion. Lose. At this time, since the rod-shaped member is connected to the insertion confirming member, the rod-shaped member accompanies the movement of the insertion confirming member, is drawn from the outside of the outer cylinder through the through hole, into the groove formed on the inner circumferential surface thereof, and is received.

For this reason, the operator can check the through-hole of the outer cylinder made into empty space using the naked eye or the fingertip, and whether the inserted connection pipe reaches the predetermined position with respect to the pipe joint, and whether the connection is completed or not. Easy and accurate grasping

In addition, in this type of joint, the length of the rod-shaped member of the insertion confirmation member portion is substantially equal to the distance between the distal end position of the connecting tube and the through hole of the outer cylinder when the connecting tube is completed. You can adjust it to be the same. Thereby, when the inserted connection tube reaches the position which completes the connection completely, all the rod-shaped members are formed in the inner peripheral surface of the outer cylinder from the outside of an outer cylinder to the inside of a through hole, or through a through hole. Drawn into the groove, and received. In this way, the pipe joint of the present invention can freely change the insertion depth of the connection pipe, that is, the insertion confirmation position of the connection pipe, by adjusting the length of the rod-shaped member of the connection pipe insertion confirmation means. have.

Moreover, you may arrange | position a plurality of rod-shaped members with respect to the insertion confirmation member main body, In this case, it is necessary to form the through-hole corresponding to the number and position of a rod-shaped member in an outer cylinder.

The length of the rod-shaped member does not need to be exactly the same as the distance from the through hole to the tip position of the connecting pipe, and the reason why it is sufficient even if it is substantially "substantially" is actually the depth of the through hole (thickness of the outer cylinder). This is because there are factors that cause errors such as elongation when the rod-shaped member is bent and drawn in, curvature of the bent portion, and the like.

In the present invention, a groove is formed on the inner circumferential surface of the outer cylinder at least from the through hole toward the inner side in the axial direction. If the groove is not formed on the inner circumferential surface of the outer cylinder, the inner member of the outer cylinder and the outer circumferential surface of the connecting tube may cause the rod-shaped member to be drawn into the receiving portion with the insertion of the connecting tube to prevent further insertion of the connecting tube. It will lead to a failure between being sandwiched or pulled.

In the present invention, the space formed between the inner circumferential surface of the outer cylinder and the outer circumferential surface of the connecting tube in order to attract the rod-shaped member includes a gap formed by the diameter difference between the inner diameter of the outer cylinder and the outer diameter of the connecting tube. It does not use, but requires the formation of a groove portion different from that. The reason for this is that when the gap portion is used, the gap between the inserted tube and the outer cylinder is caused to rattle, and the tube cannot be firmly fixed. On the other hand, when a groove is formed in a part of the inner circumferential surface of the outer cylinder, the inner diameter of the outer cylinder can be designed to be approximately the same size as the outer diameter of the connecting tube, so that the insertion and fixing of the connecting tube without rattling can be realized. Can be. In addition, the inner diameter of the outer cylinder is set relatively larger than the outer diameter of the connecting pipe, and on the inner circumferential surface of the outer cylinder, a plurality of radially extending from the inner circumferential surface of the outer cylinder having an end portion substantially terminated on the outer circumferential surface of the connecting pipe. By providing the ribs, it is possible to prevent rattling and to form grooves for pulling rod-shaped members.

In addition, the groove portion of the outer cylinder has a larger inner diameter of the outer cylinder than the outer diameter of the connecting pipe, and has a slit extending in the axial direction and a sleeve having an inner diameter approximately the same as the outer diameter of the connecting pipe. It can also form. That is, the slit part after sleeve mounting forms a groove part on the inner peripheral surface of an outer cylinder.

The cross section of the sleeve is generally O-shaped so as to be in close contact with the inner circumferential surface of the outer cylinder. However, in the case of the present invention, when mounting the sleeve on the inner circumferential surface of the outer cylinder in consideration of the ease of mounting, it may be a C-shaped shape cut off a portion of the cross section so that the outer diameter can be small.

The use of the sleeve as described above improves the moldability of the outer cylinder and the mounting property of the internal parts such as the insertion check member, the locking ring, and the seal ring. In particular, in the case of a pipe joint of a type using a locking ring described later, a fixed wall parallel to the radial direction for restricting the movement in the axial direction of the locking ring can be easily formed on the inner circumferential surface of the outer cylinder.

In the present invention, the rod-shaped member is accommodated in the groove portion on the inner circumferential surface of the outer cylinder while being bent and deformed, accompanying the movement of the insertion confirmation member toward the axially inner side. For this reason, it is preferable that the rod-shaped member and the insertion confirmation member including the same are made of a material which is flexible and resistant to tensile stress. Examples of such materials include thermoplastic elastomers, synthetic rubber or natural rubber. In particular, in the case of thermoplastic elastomers, since the elongation with respect to a certain load is generally smaller than that of synthetic rubber or natural rubber, the rod-shaped member is required to be bent and deformed while maintaining the length corresponding to the insertion confirmation position of the connection pipe. It is suitable as a material.

Moreover, in order to acquire the high deformation | transformation characteristic of a rod-shaped member, it can also make it easy to bend by studying a shape, such as making the cross section into a flat shape. In particular, the rod-shaped member forms a similar hinge structure having a smaller cross-sectional area than other portions, such as narrowing the cross-sectional area near the root of the ring-shaped insertion confirming member main body or making the thickness thinner, thereby increasing the high Flexural characteristics can be obtained.

The shape of the tip of the rod-shaped member is not particularly limited, but in order to facilitate identification by the operator's finger or the like, the shape of the tip can be stimulated to a fingertip such as a sharp shape or a surface having irregularities. You can also do In addition, in order to improve the visibility by visual observation, the tip of the rod-shaped member or rod-shaped member may be colored with a visible color such as fluorescent color.

According to the present invention, a C-shaped ring or O-shaped ring member having a radially extending flexible rod-shaped member is disposed in a receiving portion of a joint, and the length of the rod-shaped member is adjusted so that the connection tube can be inserted. The ring-shaped component is pushed inwardly by the connecting pipe, and the rod-shaped member preset in the through hole is drawn in from the outside of the outer cylinder to connect the length of the receiving portion of the pipe joint. A one-touch pipe joint provided with a dedicated connection pipe insertion confirmation means capable of freely changing the insertion confirmation position of the pipe can be provided.

As a result, the operator can confirm the through-hole of the outer cylinder made into an empty space by using a time or a fingertip, and whether the inserted connection pipe reaches the predetermined position with respect to the pipe joint, and whether or not the connection is completed. It can be easily and accurately identified.

1 is a pipe joint according to one embodiment of the present invention, the central axis showing a state before insertion of a connection tube in the upper half and a state after insertion of the connection tube in the lower half. It is sectional drawing when it cuts into the cross section which passes.
Figure 2 is a perspective view of the insertion confirmation member disposed in the receiving portion of the embodiment of FIG.
3 is a perspective view of a sleeve mounted on an inner circumferential surface of the outer cylinder of the embodiment of FIG. 1.
4 is a perspective view of an insertion confirmation member of another embodiment.
5 is a perspective view of a sleeve of another embodiment.
6 is a perspective view illustrating the inner locking ring of the embodiment of FIG. 1.
FIG. 7 is a cross-sectional view when the inner locking ring of FIG. 6 is cut into a cross section passing through the central axis.
8 is a perspective view illustrating the outer locking ring of the embodiment of FIG. 1.
FIG. 9 is a cross-sectional view when the outer locking ring of FIG. 8 is cut into a cross section passing through the central axis. FIG.
Fig. 10 is a cross-sectional view of the seam according to another embodiment according to the present invention, cut in the cross section through the central axis, showing the state before insertion of the connection pipe in the upper half and the state after insertion of the connection pipe in the lower half. .

EMBODIMENT OF THE INVENTION Hereinafter, the one-touch pipe joint which concerns on one Embodiment of this invention is demonstrated in detail, referring drawings. In addition, this invention is not limited to the Example shown below, Various changes are possible within the range which does not deviate from the technical idea of this invention.

[Example]

Example 1

Fig. 1 is a one-touch pipe joint 1 according to a preferred embodiment of the present invention having a connection pipe insertion check means 6, which shows a state before insertion of the connection pipe in the upper half, and the connection pipe insertion in the lower half. The cross-sectional view at the time of cutting | disconnecting in the cross section which shows the state afterward and the central axis is shown. As understood with reference to FIG. 1, the pipe joint 1 of this invention should just be equipped with the at least 1 connection pipe insertion socket 2, Therefore, the shape as a whole is not limited only to an I-shape, It may be T-shaped or cross-shaped.

The pipe joint 1 includes a joint main body 3, an inner cylinder 4, an outer cylinder 5, an inner locking ring 11 and an outer locking ring 12, and a connection pipe insertion checking means 6. Each part has a substantially cylindrical or ring shape. In addition, in the present Example 1, the joint main body 3 contains the inner cylinder 4, and is integrally shape | molded by injection molding. The joint body 3 and the inner cylinder 4 have a passage opening 30 for flowing a fluid therein, and the tip portion 31 has a funnel shape in order to reduce the resistance of the fluid. Moreover, when importance is placed on productivity, cost, and the like of the pipe joint 1, the joint body 3, the inner cylinder 4, and the outer cylinder 5 may be integrally molded with all of their parts by injection molding or the like. It may be.

The connecting tube insertion checking means 6 used in the first embodiment includes a through hole 50 formed in the outer cylinder 5, a sleeve 7 mounted on the inner circumferential surface of the outer cylinder 5, and the outer cylinder. And an insertion check member 8 disposed in the receiving portion 13 formed by the inner cylinder 4. By the connection pipe insertion confirmation means 6, the inserted connection pipe 10 reaches a predetermined position in the pipe joint 1 to easily and accurately grasp whether or not the connection of the connection pipe 10 is completed. do.

2 shows a perspective view of the insertion confirming member 8 arranged in the receiving portion 13. The insertion confirmation member 8 comprises an O-shaped ring-shaped insertion confirmation member main body 80 and a flexible rod-shaped member 81 extending radially from the main body. In the initial state before the connection pipe 10 is inserted, the rod-shaped member 81 is provided in the receiving portion 13 of the pipe joint 1 so as to protrude outward from the through-hole 50 of the outer cylinder 5. It is arranged (see FIG. 1 above). Therefore, the insertion confirming member main body 80 connected with the rod-shaped member 81 is disposed just below the through-hole 50 of the outer cylinder 5, and the rod-shaped member 81 adjusts its length. By doing so, it is possible to freely change the protruding length from the outer cylinder outer circumferential surface so that the operator can easily confirm the initial state before the connection pipe insertion.

The through-hole 50 formed in the outer cylinder 5 should just be an opening which penetrates the inner and outer peripheral surfaces of the outer cylinder 5, and there is no restriction | limiting in particular in the position, size, and shape of the hole. However, the position of the through-hole 50 is the distance from the insertion confirmation position or the deepest part 14 of the connection pipe 10 in the pipe fitting receiving part 13, or the penetration hole 50 before insertion of the connection pipe | tube. Is determined in consideration of the length of the rod-shaped member 81 to be protruded in advance.

On the other hand, when the connecting pipe 10 is inserted into the receiving portion 13 of the pipe joint 1, the insertion confirming member 8 occupies all or part of the end face of the receiving portion. ) Is pushed into the deepest portion 14 of the pipe joint receiving portion 13. At this time, since the rod-shaped member 81 is connected to the insertion confirming member main body 80, it accompanies the movement of the insertion confirming member 8 and passes through the through hole 50 from the outside of the outer cylinder 5. , It is drawn into the groove (slit) 71 formed on the inner circumferential surface of the outer cylinder 5 by the sleeve 7 and is accommodated (see FIG. 1 lower side).

In the connecting tube insertion checking means 6 used in the first embodiment, the length of the rod-shaped member 81 is determined by the position of the tip of the connecting tube 10 when the connection of the connecting tube 10 is completed. What is necessary is just to adjust so that it may become substantially equal to the distance between the through-hole 50 of the outer cylinder 5. Thereby, when the inserted connection pipe 10 reaches the position which complete | finished the connection completely, the rod-shaped member 81 all enters into the through-hole 50 from the exterior of the outer cylinder 5, Alternatively, the through hole 50 is pulled into the groove portion 71 formed on the inner circumferential surface of the outer cylinder 5 by the sleeve 7 and accommodated therein (but in FIGS. 1 and 10, the rod In order to exaggerate the accommodating state of the shaped member 81, the length of the rod-shaped member 81 is shown to be shorter than the required length). Accordingly, in the pipe joint 1 of the first embodiment, the connection pipe 10 with respect to the length of the accommodating portion of the pipe joint 1 is adjusted by adjusting the length of the rod-shaped member 81 of the connection pipe insertion checking means 6. ), The insertion depth of the connection pipe 10 can be freely changed.

As a result, the operator can confirm the through-hole 50 of the outer cylinder 5 which became an empty space by using a time or a fingertip, and the inserted connection pipe 10 is predetermined with respect to the pipe joint 1. Reaching the position, it is possible to easily and accurately determine whether the connection is complete or not.

In addition, in the first embodiment, two rod-shaped members 81 are symmetrically installed with respect to the center of the insertion confirmation member main body 80 for the purpose of more easily confirming the insertion state of the connection pipe 10. For this reason, in the outer cylinder 5 of the pipe joint 1, the two through-holes 50 correspond to the number and position of the said rod-shaped member 81, and the central axis 51 of the outer cylinder 5 is carried out. ) Is installed symmetrically.

The rod-shaped member 81 is accommodated into the groove portion 71 on the inner circumferential surface of the outer cylinder while being bent and deformed, accompanying the movement of the insertion confirming member 8 toward the inner side in the axial direction. For this reason, it is preferable that the rod-shaped member 81 and the insertion confirmation member 8 including the same are made of a material which is flexible and resistant to tensile stress, and in the first embodiment, it is made of thermoplastic elastomer. Since the thermoplastic elastomer generally has a smaller elongation with respect to a certain load than synthetic rubber or natural rubber, it is a rod-shaped member which is required to be bent and deformed while maintaining the length corresponding to the insertion confirmation position of the connection pipe 10 ( 81) as a material.

In addition, in order to obtain the high deformation | transformation characteristic of the rod-shaped member 81, it can also be made easy to bend by studying a shape, such as making the cross section into a flat shape. As shown in Fig. 2, the rod-shaped member 81 of the first embodiment has a narrow cross-sectional area near the root of the insertion confirmation member main body 80, or is locally thinned as shown in Fig. 4. By forming a similar hinge structure having a smaller cross-sectional area than other portions, it is possible to obtain high bending characteristics at the initial stage of pulling in.

In addition, the shape of the tip of the rod-shaped member 81 may be shaped such that the tip of the rod-shaped member 81 can be stimulated to the fingertips, such as a sharp shape or a surface having irregularities, in order to facilitate confirmation by an operator's fingertip or the like. It may also be (see Figure 4). In addition, in order to improve the visibility by visual observation, the tip of the rod-shaped member 81 or the rod-shaped member may be colored with a prominent color such as fluorescent color.

3, the perspective view of the sleeve 7 mounted on the inner peripheral surface, such as an outer cylinder, is shown. The sleeve 7 has a cylindrical shape having an O-shaped cross section at its end portion 70, and the main surface thereof has an axial direction corresponding to the position of the through hole 50 of the outer cylinder 5. The two slits 71 which extend to and face each other are formed. In the first embodiment, by attaching the sleeve 7 to the inner circumferential surface of the outer cylinder 5, the groove portion 71 made of a slit is formed from the through hole 50 toward the inner side in the axial direction.

If the groove portion 71 is not formed on the inner circumferential surface of the outer cylinder 5, the rod-shaped member 81 drawn into the accommodation portion 13 with the insertion of the connection tube 10 is connected to the connection tube ( 10) will cause a failure to be inserted or pulled between the inner circumferential surface of the outer cylinder 5 and the outer circumferential surface of the connecting pipe 10 so as to prevent further insertion.

In addition, as a space formed between the inner circumferential surface of the outer cylinder 5 and the outer circumferential surface of the connecting tube 10 in order to attract the rod-shaped member 81, the inner diameter of the outer cylinder 5 and the connecting tube 10 are provided. Rather than using the gap portion caused by the difference in diameter of the outer diameter, a groove portion 71 different from that is formed. The reason for this is that, when the gap portion is used, the gap between the inserted pipe 10 and the outer cylinder 5 is rattled, and the connection pipe 10 cannot be firmly fixed.

Therefore, in the present Example 1, the inner diameter of the outer cylinder 5 is set larger than the outer diameter of the connection pipe 10, and by attaching the sleeve 7 therein, it is about the same as the outer diameter of the connection pipe 10. FIG. An inner circumferential surface having an inner diameter of size is formed. In addition, the sleeve 7 is made into the C shape which cut | disconnected and removed a part of cross section as shown in FIG. 5 so that the outer diameter may be made small in consideration of the ease of attachment.

The use of such a sleeve 7 improves the formability of the outer cylinder 5 and the mountability of internal parts such as the insertion check member 8 and the outer locking ring 12. Especially in the case of the pipe joint 1 of the type which uses the outer locking ring 12 mentioned later, the fixed wall 72 parallel to the radial direction for restricting the movement of the outer locking ring 12 to the axial direction is also, Since it can form easily on the inner peripheral surface of the outer cylinder 5, it is convenient.

As will be understood with reference to FIG. 1 again, in the receiving portion 13 of the pipe joint 1 of the first embodiment, the first projection portion which functions to press the inner and outer peripheral surfaces when the connecting tube is inserted and the connecting tube At the time of withdrawal, the inner locking ring 11 and the outer locking ring 12 having the second protrusion functioning to stop the connecting pipe are arranged to be movable in the axial direction. However, in the first embodiment, the locking ring need not be attached to both the outer circumferential surface of the inner cylinder 4 and the inner circumferential surface of the outer cylinder 5, but may be attached to either of them. However, considering that the locking ring on one side may be damaged by falling of the pipe joint 1, adhesion of the solvent, pressing on, or the like, the locking ring is the inner cylinder 4 and the outer cylinder 5 as in the first embodiment. It is preferable that it is attached to both sides.

In addition, in order to arrange | position so that the inner locking ring 11 and the outer locking ring 12 can be moved to an axial direction in the outer peripheral surface of the inner cylinder 4 of the pipe joint 1, and the inner peripheral surface of the outer cylinder 5, diameter Direction and a tapered wall that is continuously expanded or reduced in diameter toward the outer side in the axial direction. For this reason, the inner lock ring 11 and the outer lock ring 12 have one end (fixed end) in the axial direction in relation to the fixed wall of the inner cylinder 4 or the outer cylinder 5. The movement is substantially limited, and the other end (free end) is mounted between the fixed wall and the tapered wall so as to allow movement in the axial direction by the relationship with the tapered wall (see Fig. 1).

6 and 7 show a perspective view of the inner locking ring 11 used in the pipe joint 1 of the present embodiment and a cross-sectional view when cut into a cross section passing through the central axis.

The inner locking ring 11 arranged on the outer circumferential surface of the inner cylinder 4 is made of a cylindrical body, and the body portion has a plurality of slits 111 formed of a cylindrical body so as to form a free end of a cantilever. It is cut from the end. In addition, the inner locking ring 11 has a first outward protrusion 112 which functions to press the inner circumferential surface of the connection pipe by elastic deformation when the connection pipe is inserted, and to stop the connection pipe when the connection pipe is pulled out. It is provided with the 2nd outward protrusion part 113 arrange | positioned at the said free end which functions.

The pressing function of the first outward protrusion 112 is achieved by making the structure of the inner lock ring itself that supports the protrusion of the inner lock ring 11 a structure capable of elastic deformation. That is, since the bulging portion 110 of the inner locking ring 11 has a shape such as a mesauring worm (looper) in its axial cross section (see Fig. 1), if it is pressed inward in the radial direction, The inner circumferential surface of the connecting pipe 10 that is bent and inserted by the reaction force is appropriately pressed. In addition, since the slit 111 extends in the axial direction so as to penetrate the body portion of the inner locking ring 11, each of the bulges 110 divided by the slit 111 is elastically deformed without interfering with each other. Makes it easy.

As a result, in the pipe joint 1 of this embodiment, when the connecting pipe 10 is inserted to a predetermined position of the accommodation portion 13 of the pipe joint 1, and then moved in the pulling direction, the first outward protrusion ( Since 112 is engaged with the inner peripheral surface of the connection pipe 10, the inner locking ring 11 also moves in the extraction direction together with the connection pipe 10. The free end of the inner locking ring 11 enters the tapered wall region of the inner cylinder 4, and by interaction with the tapered wall, the inner locking ring 11 connects the second outward protrusion 113 to the connection pipe. It expands so that it may press-contact to the inner peripheral surface of (10), and the connection pipe 10 is reliably and firmly stopped by the 2nd outward protrusion part 113. As shown in FIG.

8 and 9 show a perspective view of the outer locking ring 12 used in the pipe joint 1 of the present embodiment and a cross-sectional view when cut into a cross section passing through the central axis.

The outer locking ring 12 disposed on the inner circumferential surface of the outer cylinder 5 is formed of a cylindrical body similarly to the inner locking ring 11 described above, and the plurality of slits are formed in the trunk portion so as to form a free end of the cantilever beam. Reference numeral 121 is cut from the end of the cylindrical body. In addition, the outer locking ring 12 has a first inward protrusion 122 that functions to press the outer circumferential surface of the connection pipe by elastic deformation when the connection pipe is inserted, and to stop the connection pipe when the connection pipe is pulled out. It is provided with the 2nd inwardly projecting part 123 arrange | positioned at the said free end.

The pressing function of the first inwardly projecting portion 122 is achieved by making the structure of the outer locking ring itself supporting the protrusion of the outer locking ring 12 a structure that can be elastically deformed. That is, since the convex part (concave part) 120 of the outer locking ring 12 has the shape of the axial cross section like a mesauring worm (looper) (refer FIG. 1), the radial direction When it pushes outward, it bends and the outer peripheral surface of the connection pipe 10 inserted by the reaction force is pressed suitably. In addition, since the slit 121 extends in the axial direction so as to penetrate the body portion of the outer locking ring 12, the elastic deformation is performed without each of the narrowing portions 120 divided by the slit 121 interfering with each other. Makes it easy.

As a result, in the pipe joint 1 of the present embodiment, when the connecting pipe 10 is inserted to a predetermined position of the receiving portion 13 of the pipe joint 1 and then moved in the pulling direction, the first inward protrusion ( Since 122 is locked to the outer peripheral surface of the connection pipe 10, the outer locking ring 12 also moves in the extraction direction together with the connection pipe 10. The free end of the outer locking ring 12 enters the tapered wall region of the outer cylinder 5, and by interaction with the tapered wall, the outer locking ring 12 connects the second inwardly projecting portion 123 to the connection pipe. It is reduced in diameter so as to be press-contacted to the outer circumferential surface of (10), and the connection pipe 10 is firmly and firmly locked to the connection pipe 10 by the second inwardly projecting portion 123.

The material of the locking rings 11 and 12, which can achieve the above functions, is not particularly limited as long as it is hard and has appropriate elasticity, but may be molded from a plastic material or a metal material. In particular, when molding into a plastic material, it is preferable to use an engineering plastic material such as polyphenylsulfone (PPSU) resin or polyphenylene sulfide (PPS) resin as the material.

The pipe joint 1 of this embodiment is provided with two seal rings 15 and 15 'in order to seal the clearance gap with the connection pipe 10 on the outer peripheral surface of the inner cylinder 4 (refer FIG. 1). . The seal rings 15, 15 'are fixed by forming grooves 16, 16' on the outer circumferential surface of the inner cylinder 4 and accommodating therein. In addition, although there is no restriction | limiting in particular in the cross-sectional shape of a seal ring, In this Embodiment 1, the seal rings 15 and 15 'which have O-type cross section are used.

The seal ring can be disposed on the outer circumferential surface of the inner cylinder 4, on the inner circumferential surface of the outer cylinder 5, or on the main surfaces of both of them. However, in the case of the pipe joint 1 of the first embodiment, the purpose of excluding the influence of dust and dust invading from the outside as much as possible and maintaining the seal state even when the outer cylinder 5 is damaged for any reason. Thus, seal rings 15 and 15 'are disposed on the outer circumferential surface of the inner cylinder 4. In addition, the arrangement of the seal rings 15 and 15 'prevents corrosion of the metal part exposed in the cross section when the circular pipe such as an aluminum three-layer pipe is connected to the pipe joint by the pipe joint 1. It also helps.

Moreover, the seal ring 15 is arrange | positioned in the position which opposes the 2nd inward protrusion 123 of the outer locking ring 12 like this Embodiment 1, and press-contacts the 2nd inward protrusion 123 after a connection pipe mounting. You can use the force to get a stronger seal effect. In addition, for the purpose of reducing the rattling of the connection pipe 10 after mounting, the seal rings 15 and 15 'of the present embodiment have the inner locking ring 11 on the same side between them. As far as possible, it is arrange | positioned separately in the front and rear.

[Example 2]

Fig. 10 is a one-touch pipe joint 1 'according to another preferred embodiment of the present invention having a connection pipe insertion check means 6, which shows a state before insertion of the connection pipe in the upper half and the connection pipe in the lower half. The state after insertion is shown, and the cross section at the time of cut | disconnecting to the cross section passing through the central axis is shown. As will be understood with reference to Fig. 10, the pipe joint 1 'of the second embodiment has a plurality of teeth or protrusions in which the locking ring 17 for locking the connection pipe 10 extends radially. In addition, it has the same structure as the pipe joint 1 of Example 1 except having the ring-shaped locking ring fixed to the inner peripheral surface of the outer cylinder 5.

Accordingly, the pipe joint 1 'of the second embodiment includes a joint body 3, an inner cylinder 4, an outer cylinder 5, a fixed outer locking ring 17, and a connection pipe insertion checking means 6 And any part has a substantially cylindrical or ring-shaped shape. In addition, in the present Example 2, the joint main body 3 contains the inner cylinder 4, and is integrally shape | molded by injection molding. The joint body 3 and the inner cylinder 4 have a passage opening 30 for flowing a fluid therein, and the tip portion 31 has a funnel shape in order to reduce the resistance of the fluid. In addition, in the case of focusing on productivity, cost, and the like of the pipe joint 1 ', the joint body 3, the inner cylinder 4, and the outer cylinder 5 are the same as in the case of the pipe joint 1 of the first embodiment. ) May be integrally molded by injection molding or the like.

In the pipe joint 1 ′ of the second embodiment, the connecting tube insertion checking means 6 of the connecting tube 10 includes a through hole 50 formed in the outer cylinder and an inner circumferential surface of the outer cylinder 5. And an insertion check member 8 disposed in the receiving portion 13 formed by the outer cylinder 5 and the inner cylinder 4 mounted on the sleeve 7 mounted thereon, and these are the tubes of the first embodiment. The same as in the case of the joint 1. Therefore, in the pipe joint 1 'of the second embodiment, the functions and configurations of the parts other than the fixed outer locking ring 17 are the same as those of the pipe joint 1 of the first embodiment. Detailed description of the function or configuration is omitted.

In the pipe joint 1 'of the second embodiment, as shown in the upper half of FIG. 10, before the connecting pipe 10 is inserted into the receiving portion 13 of the pipe joint 1', an O-shaped ring shape is shown. The rod-shaped member 81 of the insertion confirming member 8 is arranged to protrude from the inside of the through hole 50 to the outside of the outer cylinder 5. And the operator confirms the presence of the rod-shaped member 81 with the naked eye or a finger from the outside, and it is easy for the connection pipe 10 and the pipe joint 1 'not yet connected in a perfect state. You can figure it out for sure.

On the other hand, when the connection pipe 10 is inserted into the innermost part 14 of the receiving portion 13 of the pipe joint 1 'and the connection and fixing of the connection pipe 10 are completed, the insertion confirmation member 8 Since it occupies all or part of the cross section of the accommodating part 13, it contacts by the front-end | tip part of the connection pipe 10, and is pushed to the deepest part 14 of the pipe joint accommodating part 13. As shown in FIG. At this time, since the rod-shaped member 81 is integrally connected with the insertion confirming member main body 80, the through-hole 50 from the outside of the outer cylinder 5 is accompanied by movement of the insertion confirming member 8. ), It is drawn into the groove (slit) 71 formed in the inner circumferential surface of the outer cylinder 5 by the sleeve 7, and is received.

As a result, the operator can confirm the through-hole 50 of the outer cylinder 5 which became an empty space using the naked eye or a finger, etc., and the inserted connection pipe 10 is predetermined with respect to the pipe joint 1 '. By reaching the position of, it is possible to easily and accurately grasp whether or not the connection is completed.

1, 1 '... ... One-touch pipe joint
2 … ... socket
3…. ... Seam
30 ... ... Passage opening
31 ... ... Tip
4 … ... Inner body
5 ... ... Outer body
50 ... ... Through hole
51 ... ... Central axis
6 ... ... Insertion check means
7 ... ... sleeve
70 ... ... End
71 ... ... Slit, groove
8 … ... Insertion Confirmation Member
80... ... Insertion Confirmation Member
81... ... Rod-shaped member
10 ... ... Connector
11 ... ... Inner locking ring
110 ... ... Bulbu
111. ... Slit
112. ... First outward protrusion
113. ... 2nd outward projection
12 ... ... Outer locking ring
120... ... Ridge
121. ... Slit
122... ... First inward protrusion
123. ... 2nd inward protrusion
13 ... ... Receptacle
14. ... Deepest part
15, 15 '... ... Seal ring
16,16 '... ... Groove
17 ... ... Fixed outer locking ring

Claims (10)

A joint body, an outer cylinder and an inner cylinder for forming a receiving portion for accepting the connecting pipe, and connecting pipe insertion checking means for confirming the insertion state of the connecting pipe. In pipe joint,
The insertion confirmation means,
A through hole penetrating the inner circumferential surface and the outer circumferential surface of the outer cylinder;
A groove portion extending from the through hole in the axial direction and formed on the inner circumferential surface of the outer cylinder; and
And a C-shaped ring or O-shaped insertion confirmation member having a radially extending flexible rod-shaped member and axially movable in the receiving portion,
The rod-shaped member is arranged to protrude from the inside of the through hole to the outside of the outer tube before insertion of the tube. When the tube is inserted, the rod-shaped member has the insertion confirmation member at the distal end of the tube. By being pushed inward in the axial direction so as to be drawn in from the outside of the outer cylinder to be received into the groove formed on the inner circumferential surface thereof. The method of claim 1,
And the insertion confirmation position of the connection pipe with respect to the length of the receiving portion of the pipe joint can be freely changed by adjusting the length of the rod-shaped member of the insertion confirmation member. The method according to claim 1 or 2,
The groove is formed by attaching a sleeve having a slit extending in the axial direction to an inner circumferential surface of the outer cylinder. The method according to claim 1 or 2,
The rod-shaped member is a pipe joint, characterized in that its cross section is flat. The method according to claim 1 or 2,
And said insertion check member is molded from a thermoplastic elastomer or synthetic rubber or natural rubber. The method according to claim 1 or 2,
An outer circumferential surface of the inner cylinder or an inner circumferential surface of the outer cylinder includes a seal ring for sealing a gap with the connecting pipe. The method according to claim 1 or 2,
The pipe joint is,
The inner cylinder further having a fixed wall parallel to the radial direction and a tapered wall continuously expanding toward the outer side in the axial direction, and
A cylindrical body having a plurality of slits for forming a free end of the cantilever, wherein the inner peripheral surface of the connecting tube is pressed by elastic deformation of the cylindrical body when the connecting tube is inserted. It has a 1st outward protrusion part, and the 2nd outward protrusion part arrange | positioned at the said free end and which stops the said connection pipe when the said connection pipe is taken out, and moves axially between the fixed wall and the tapered wall of the said inner cylinder. It further comprises an inner locking ring which is arranged to be possible,
When the connection pipe is inserted to a predetermined position of the accommodation portion and then moved in the extraction direction, the inner locking ring moves in the extraction direction together with the connection pipe by stopping the first outward protrusion on the inner circumferential surface of the connection pipe. And the free end of the inner locking ring enters the tapered wall region of the inner cylinder, and by interaction with the tapered wall, the inner locking ring press-contacts the second outward protrusion to the inner circumferential surface of the connection pipe. Pipe joint, characterized in that expanded to. The method according to claim 1 or 2,
The pipe joint is,
The outer cylinder further having a fixed wall parallel to the radial direction and a tapered wall continuously axially oriented toward the outer side in the axial direction, and
A cylindrical body having a plurality of slits to form a free end of the cantilever beam, wherein the tubular body has a first inwardly projecting portion for pressing the outer circumferential surface of the connection pipe by elastic deformation of the cylindrical body when the connection pipe is inserted, and is disposed at the free end. And an outer locking ring which has a second inwardly projecting portion to stop the connecting tube when the connecting tube is pulled out, and is axially movable between the fixed wall and the tapered wall of the outer cylinder. Doing
When the connection pipe is inserted to a predetermined position of the housing portion and then moved in the extraction direction, the outer locking ring moves in the extraction direction together with the connection pipe by stopping the first inward protrusion on the outer circumferential surface of the connection pipe. And the free end of the outer locking ring enters the tapered wall region of the outer cylinder, and by interaction with the tapered wall, the outer locking ring press-contacts the second inwardly projecting portion to the outer circumferential surface of the connection pipe. A pipe joint characterized in that the shaft is reduced to. The method according to claim 1 or 2,
The pipe joint is,
The inner cylinder further having a fixed wall parallel to the radial direction and a tapered wall continuously expanded in the axial direction outward,
The outer cylinder further having a fixed wall parallel to the radial direction and a tapered wall continuously reduced in the axial direction toward the outer side,
A cylindrical body having a plurality of slits to form a free end of the cantilever beam, the cylindrical body having a plurality of slits, the first outwardly projecting portion for pressing the inner circumferential surface of the connection pipe by elastic deformation of the cylindrical body when the connection pipe is inserted, and disposed at the free end. And an inner locking ring which has a second outward protrusion which stops the connecting pipe when the connecting pipe is pulled out, and is axially movable between the fixed wall and the tapered wall of the inner cylinder. , And
A cylindrical body having a plurality of slits to form a free end of the cantilever beam, wherein the tubular body has a first inwardly projecting portion for pressing the outer circumferential surface of the connection pipe by elastic deformation of the cylindrical body when the connection pipe is inserted, and is disposed at the free end. And an outer locking ring which has a second inwardly projecting portion to stop the connecting tube when the connecting tube is pulled out, and is axially movable between the fixed wall and the tapered wall of the outer cylinder. and,
When the connection pipe is inserted to a predetermined position of the accommodation portion and then moved in the extraction direction, the inner locking ring moves in the extraction direction together with the connection pipe by stopping the first outward protrusion on the inner circumferential surface of the connection pipe. And the free end of the inner locking ring enters the tapered wall region of the inner cylinder, and by interaction with the tapered wall, the inner locking ring press-contacts the second outward protrusion to the inner circumferential surface of the connection pipe. And the outer locking ring is moved in a withdrawal direction together with the connecting pipe by the first inwardly protruding portion being locked to the outer circumferential surface of the connecting pipe, and the free end of the outer locking ring is tapered of the outer cylinder. Entering the wall area and interacting with the tapered wall, the outer locking ring is configured to allow the second inwardly projecting portion to be formed on the outer circumferential surface of the connection pipe. Pipe joints characterized in that the shaft diameter to a pressure contact. With the joint body,
An inner cylinder extending from the seam main body toward the outer side in the axial direction;
A through-hole penetrating the inner and outer circumferential surfaces, and a groove portion extending from the through-hole to the axially inner side on the inner circumferential surface, and disposed outside of the inner cylinder to connect the connection pipe with the inner cylinder. The outer cylinder which forms the accommodating part to receive,
A locking ring which prevents the connection tube from being pulled out by pressing a projection having a sharp end to the inner circumferential surface and / or the outer circumferential surface of the connection tube inserted into the accommodation portion, and a flexible rod-shaped member extending radially; And an insertion confirmation member having a C-shaped ring shape or an O-shaped ring shape disposed axially movable in the accommodation portion.
The rod-shaped member is arranged to protrude from the inside of the through hole to the outside of the outer tube before insertion of the tube. When the tube is inserted, the rod-shaped member has the insertion confirmation member at the distal end of the tube. By being pushed inward in the axial direction so as to be drawn in from the outside of the outer cylinder to be received into the groove formed on the inner circumferential surface thereof, and by adjusting the length of the rod-shaped member of the insertion confirming member to accommodate the pipe joint. Pipe joint characterized in that the insertion confirmation position of the connecting pipe with respect to the sub-length can be changed freely.

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