JP5286129B2 - Pipe fitting - Google Patents

Description

The present invention relates to a pipe joint that connects connection pipes with a single touch, and in particular, a curved lock ring that deforms so as to extend in the axial direction when pressed in the radial direction in the connection pipe housing portion of the pipe joint. When the connecting pipe is inserted, the free end having the claw portion of the lock ring is displaced so as to press the inner peripheral surface and / or outer peripheral surface of the connecting pipe by interaction with the surrounding tapered wall. It relates to a pipe joint.

Conventionally, a pipe joint for connecting a connecting pipe with one touch is known. For example, Japanese Utility Model Laid-Open No. 4-18793 (Patent Document 1), Japanese Patent Application Laid-Open No. 2001-193883 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2003-227592 (Patent Document 3) disclose concentric inner cylinders. A cylindrical lock ring with protrusions such as teeth or claws for locking the connecting pipe moves in the axial direction between the body and the outer cylinder with a tapered surface that decreases in diameter toward the insertion port There is disclosed a one-touch type pipe joint whose basic configuration is to be built in. This type of pipe joint is a taper formed by inserting the connecting pipe to the deepest part and then pulling it back to move the lock ring to the vicinity of the insertion port, and the protrusion of the lock ring is formed near the insertion port of the outer cylinder. The diameter of the connecting pipe is reduced by the interaction with the surface so as to bite into the outer peripheral surface of the connecting pipe, thereby preventing the connecting pipe from coming off.

In addition, this type of fittings is normally locked because it is necessary to prevent the lock ring from moving into the insertion slot for some reason after insertion of the connecting pipe and releasing the biting of teeth or claws. There is a feature that an elastic body such as a spring that constantly urges the lock ring toward the insertion port is arranged behind the ring.

Japanese Patent Application Laid-Open No. 2005-172218 (Patent Document 4) has substantially the same configuration as the pipe joint described in Patent Document 1-3, but the inside of the connection pipe inserted into the pipe joint is the inside. A one-touch type pipe joint that does not include an inner cylindrical body that is supported from the above is disclosed.

WO 2006/135227 (Patent Document 5) is another modification of the pipe joint described in Patent Document 1-3, and both the outer sleeve and the inner sleeve are tapered to narrow the gap of the insertion port. And concentrically arranged outer and inner grip rings with teeth, and both grip rings connected at their deepest depth so that they can receive a connecting tube between them. There is described a one-touch type pipe joint having a basic configuration in which a cylindrical lock ring including a bottom portion is arranged to be movable in an axial direction.

Therefore, also in the case of the pipe joint described in Patent Document 5, the connection pipe is fixed by inserting the connection pipe through the lock ring to the deepest part of the gap between the outer cylinder and the inner cylinder and then pulling it back. Move the ring to the vicinity of the insertion port, and the inner and outer circumferences of the lock ring teeth to prevent the connection tube from coming off by the interaction with the tapered surface formed near the insertion port of the outer cylinder and the inner cylinder This is achieved by biting into the surface.

And even in this type of pipe joint, it is necessary to prevent the connecting pipe from coming off due to the lock ring moving into the insertion port. Therefore, always attach the lock ring toward the insertion port at the rear of the bottom of the lock ring. A spring lip for biasing is integrally formed.

However, in the case of a one-touch type pipe joint using the interaction between the axially movable cylindrical lock ring and the tapered surface of the joint body as described in Patent Documents 1-5, There was a serious problem.

For one-touch type fittings with a movable lock ring, the lock ring is always urged toward the insertion port by a spring or the like to prevent the connection pipe from coming off due to movement of the lock ring after the connection pipe is inserted. There must be. Therefore, in the free state before inserting the connecting pipe, the end of the lock ring enters the tapered surface provided in the outer cylinder or the inner cylinder, and is reduced or enlarged so as to narrow the gap of the connecting pipe insertion port. Yes. For this reason, when inserting the connecting pipe, the outer peripheral surface or inner peripheral surface of the connecting pipe is damaged by the teeth or claws of the lock ring, and the sealing effect by the seal ring and the locking force by the lock ring cannot be obtained sufficiently. was there.

The lock ring is urged by a spring or the like as described above, but is not fixed to the pipe joint so as not to move with respect to any force. Therefore, for example, when the connection pipe is extended by thermal expansion, when the spring cannot resist the force, there is an essential problem that the connection pipe comes out of the pipe joint and comes off.

Furthermore, in the type of one-touch type pipe joints with a movable lock ring, in order to allow the teeth or claws of the lock ring to bite into the connection pipe, the connection pipe is once pushed into the deepest part of the pipe joint due to its structure. Since the operation of pulling back to the insertion port side has to be performed, there is a problem in that it takes time to connect the work, and a piping space for pulling back the connection pipe must be secured.

As one-touch type pipe joints other than the type having a lock ring movable in the axial direction inside the pipe joint, JP-A-9-236190 (Patent Document 6), JP-A-2006-118704 (Patent Document 7). ), As described in Japanese Patent Application Laid-Open No. 2008-164074 (Patent Document 8), an inner side extending from the joint body and an outer cylindrical body arranged concentrically to form a receiving portion for receiving a connecting pipe An annular lock ring having a plurality of radially extending teeth or pawls is secured to the outer peripheral surface of the inner cylindrical body and prevents the omission by biting into the inner peripheral surface of the connecting pipe. A type of one-touch type pipe joint is known.

Further, as described in Japanese Patent Application Laid-Open No. 2002-106792 (Patent Document 9) and Japanese Patent Application Laid-Open No. 2003-307290 (Patent Document 10), the pipe joint basically described in Patent Document 6-7 is basically described. The ring-shaped lock ring having a plurality of teeth or claws is inserted from the inner peripheral surface of the outer cylindrical body into the outer peripheral surface of the connecting pipe instead of from the outer peripheral surface of the inner cylindrical body. A fixed type one-touch type pipe joint is also known.

However, in the case of a one-touch type pipe joint in which an annular lock ring is fixed inside as described in Patent Document 6-10, the teeth or claws of the lock ring are connected pipes to be inserted. Therefore, it is necessary to sufficiently protrude from the surface of the inner cylinder body or the outer cylinder body. For this reason, when a connecting pipe is inserted, damage to the inner peripheral surface or outer peripheral surface thereof is usually larger than that of a pipe joint having a movable lock ring utilizing the interaction with the tapered surface described above. As a result, a sufficient sealing effect by the seal ring cannot be obtained, and in order to solve this problem, there is a problem that many restrictions are imposed on the design, for example, the seal ring must be mounted behind the annular lock ring. there were.

Japanese Utility Model Publication No. Hei 4-18793 JP 2001-193883 A Japanese Patent Laid-Open No. 2003-227592 JP 2005-172218 A WO2006 / 135227 publication JP-A-9-236190 JP 2006-118704 A JP 2008-164074 A Japanese Patent Laid-Open No. 2002-106762 JP 2003-307290 A

Accordingly, an object of the present invention is to provide a one-touch type tube that does not require a pulling-back operation of the connecting pipe and does not restore the shape of the lock ring after locking, so that the locking force of the connecting pipe by the lock ring is not reduced. It is to provide a joint. Another object of the present invention is to retreat to a position where it does not contact the surface of the connection pipe until the connection pipe is inserted, but after the connection pipe is inserted, it is displaced to a position where the surface of the connection pipe is firmly inserted. It is a pipe joint provided with a lock ring having protrusions such as teeth or claws, and has a simple structure capable of realizing a high sealing performance that has not been achieved in the past in combination with the seal ring, and The object is to provide a highly reliable one-touch type pipe joint.

Therefore, as a result of intensive studies on one-touch type pipe joints having a cylindrical lock ring utilizing the interaction with the tapered surface of the pipe joint body, the present inventors have found that the inside of the connecting pipe housing portion of the pipe joints. In addition, a curved lock ring that is deformed so as to extend in the axial direction when pressed in the radial direction is fixed so as to be slidable in the circumferential direction and immovable in the axial direction. In order to complete the present invention, a one-touch type pipe joint is developed in which the claw portion of the lock ring is displaced so as to press the inner peripheral surface and / or outer peripheral surface of the connecting pipe by the interaction with the surrounding tapered wall during insertion. It came.

That is, according to the present invention, the outer peripheral surface has a joint body, a fixed wall parallel to the radial direction, and a tapered wall that continuously increases in diameter toward the outer side or the inner side in the axial direction. An outer cylinder that forms an accommodating portion for receiving a connection pipe between the inner cylinder extending from the main body toward the outer side in the axial direction and the outer side of the inner cylinder. And a bulging portion that curves radially outward so as to partially occupy the gap of the housing portion, and deforms so as to extend axially when pressed radially inward, and a shaft A plurality of slits extending in a direction, and a claw portion for locking the connection pipe from the inside, and between the fixed wall and the tapered wall of the inner cylinder, A cylindrical inner lock ring disposed so as to be in sliding contact with the outer peripheral surface; In the pipe joint, when the connecting pipe is received into the housing part, the bulging part of the inner lock ring is pressed radially inward by the inner peripheral surface of the connecting pipe, and thereby the inner lock ring is In order to deform the end portion so as to enter the tapered wall region, the end portion of the inner lock ring presses the claw portion against the inner peripheral surface of the connecting pipe by interaction with the tapered wall of the inner cylinder. Thus, a pipe joint with a built-in inner lock ring is provided.

Further, according to the present invention, a structure for locking the inserted connecting pipe from the outside may be adopted. In this case, the joint main body and the inner cylinder extending from the joint main body toward the outside in the axial direction A body, a fixed wall parallel to the radial direction, and a tapered wall continuously reducing in diameter toward the outer side or the inner side in the axial direction, and mounted on the outer side of the inner cylindrical body The outer cylinder forming an accommodating portion for receiving the connecting pipe between the inner cylinder and the inner cylinder, and at least the accommodation that deforms to extend in the axial direction when pressed outward in the radial direction. A constricted portion curved radially inward so as to partially occupy the gap between the portions, a plurality of slits extending in the axial direction, and a claw portion for locking the connecting pipe from the outside And the outer cylinder body between the fixed wall and the taper wall of the outer cylinder body In a pipe joint comprising a cylindrical outer lock ring arranged so as to be in sliding contact with the inner peripheral surface, when the connection pipe is received into the housing part, the constriction part of the outer lock ring is the outer periphery of the connection pipe The end of the outer lock ring is tapered to the outer cylinder because the outer lock ring is deformed so as to be pushed radially outward by a surface and thereby the end of the outer lock ring enters the tapered wall region. An outer lock ring built-in type pipe joint is provided which is reduced in diameter so as to press the claw portion against the outer peripheral surface of the connection pipe by interaction with a wall.

Furthermore, according to the present invention, a structure for locking the inserted connecting pipe from both the inner side and the outer side may be adopted. In this case, the joint body, the fixing wall parallel to the radial direction, the axial direction An inner cylindrical body having a tapered wall continuously expanding toward the outer side or the inner side on the outer peripheral surface and extending from the joint body toward the outer side in the axial direction, and a fixed wall parallel to the radial direction And a taper wall continuously reducing in diameter toward the outer side or the inner side in the axial direction on the inner peripheral surface, and by mounting on the outer side of the inner cylinder, between the inner cylinder and An outer cylinder forming a receiving portion for receiving the connecting pipe, and deformed so as to extend in the axial direction when pressed radially inward, so as to at least partially occupy the gap of the receiving portion. A bulging portion curved outward in the radial direction, and a plurality of portions extending along the axial direction And a claw portion for locking the connecting pipe from the inside, and disposed so as to be in sliding contact with the outer peripheral surface of the inner cylindrical body between the fixed wall and the tapered wall of the inner cylindrical body. A cylindrical inner lock ring that is deformed so as to extend in the axial direction when pressed toward the radially outer side, and toward the radially inner side so as to partially occupy at least a gap of the housing portion. And a plurality of slits extending in the axial direction, and a claw portion for locking the connecting pipe from the outside, and a fixed wall and a tapered wall of the outer cylindrical body, A tubular outer lock ring arranged so as to be in sliding contact with the inner peripheral surface of the outer cylinder between the inner lock ring and the inner lock ring when receiving the connection pipe into the housing portion. The bulging part is radially inward by the inner peripheral surface of the connecting pipe. The inner lock ring is deformed so that its end enters the taper wall region, so that the end of the inner lock ring is interacted with the taper wall of the inner cylinder. The diameter of the claw portion is increased so as to press against the inner peripheral surface of the connection pipe, and the constricted portion of the outer lock ring is pressed radially outward by the outer peripheral surface of the connection pipe, and thereby the outer lock Since the ring is deformed so that the end portion of the ring enters the tapered wall region, the end portion of the outer lock ring moves the claw portion to the outer peripheral surface of the connecting pipe by interaction with the tapered wall of the outer cylindrical body. A pipe joint with a built-in inner and outer lock ring is provided which is reduced in diameter so as to be pressed.

According to the present invention, the pipe joint body, the inner cylinder body, and the outer cylinder body all have a cylindrical shape, and among these, the pipe joint body includes the inner cylinder body and can be integrally formed. Moreover, it is preferable that the pipe joint main body and the inner cylindrical body have a passage opening for allowing fluid to flow therein, and that the tip end thereof has a funnel shape in order to reduce the resistance of the fluid. Furthermore, when importance is attached to the productivity and cost of the pipe joint, all parts of the pipe joint main body, the inner cylinder body, and the outer cylinder body can be integrally formed.

In the present invention, 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 a plastic material is used, it is preferably a polyphenylene sulfide (PPS) resin.

According to the present invention, the joint main body including the inner cylinder body and the outer cylinder body are arranged concentrically, and a receiving portion for receiving the connection pipe is formed between the inner cylinder body and the outer cylinder body. A curved lock ring that deforms so as to extend in the axial direction when pressed in the radial direction is slidable in the circumferential direction and in the axial direction in the housing portion of the pipe joint. Mounted immovably. The lock ring may be attached to either the outer peripheral surface of the inner cylindrical body or the inner peripheral surface of the outer cylindrical body. It is preferable that both are attached so that the connection pipe can be gripped even when the pipe is broken.

For this reason, on the outer peripheral surface of the inner cylindrical body, a fixed wall parallel to the radial direction for slidably fixing the inner lock ring and a tapered wall continuously expanding toward the outer side or the inner side in the axial direction And are formed. Also, on the inner peripheral surface of the outer cylindrical body, a fixed wall parallel to the radial direction for slidably fixing the outer lock ring and a tapered wall continuously reducing the diameter toward the outer side or the inner side in the axial direction And are formed. The inner lock ring and / or the outer lock ring form a fixed end whose movement in the axial direction is restricted in relation to the outer peripheral surface of the inner cylindrical body and / or the fixed wall of the inner peripheral surface of the outer cylindrical body. And is mounted between the fixed wall and the tapered wall so as to form a free end that can move in the axial direction in relation to the tapered wall. Therefore, the fixed end and the free end of the inner lock ring and / or the outer lock ring formed in relation to the fixed wall and the tapered wall are mounted so that either end is located on the axially outer side or the inner side. May be.

The inner lock ring disposed on the outer peripheral surface of the inner cylindrical body deforms so as to extend in the axial direction when pressed toward the inner side in the radial direction, and a bulge portion curved toward the outer side in the radial direction, and in the axial direction. A plurality of slits extending along the claw and a claw portion for locking the connecting pipe from the inside are provided.

In addition, the bulging portion of the inner lock ring has a shape like a so-called worm in its cross-sectional shape, and deforms and extends along the outer peripheral surface of the inner cylindrical body when pressed inward in the radial direction. . For this reason, a plurality of slits extending along the axial direction penetrating the inner and outer peripheral surfaces are formed around the inner lock ring, so that the bulging portion is impossible without breaking within the elastic region of the material. Can be transformed without any problem.

As a result, when the connecting pipe is inserted into the housing portion of the pipe joint, the bulging portion of the inner lock ring is pressed radially inward by the inner peripheral surface of the connecting pipe, and the free end of the inner lock ring is pushed. It is deformed so as to enter the tapered wall region. Then, the free end of the inner lock ring is expanded by the interaction with the tapered wall of the inner cylinder so as to press the claw portion provided adjacent to the free end against the inner peripheral surface of the connecting pipe. For this reason, according to this invention, it can be firmly latched in the accommodating part of a pipe joint, without performing the useless operation of pulling back a connecting pipe to the insertion port side. Further, since the shape of the inner lock ring is not restored after locking, the locking force of the connecting pipe by the inner lock ring is not reduced.

Therefore, the bulging portion of the inner lock ring protrudes from the outer peripheral surface of the inner cylindrical body into the accommodating portion so as to come into contact with the inner peripheral surface of the connecting pipe when the connecting pipe is inserted into the accommodating portion of the pipe joint. That is, the bulging portion of the inner lock ring has a shape that partially occupies at least the gap of the housing portion by the mounting.

On the other hand, the outer lock ring disposed on the inner peripheral surface of the outer cylindrical body is deformed so as to extend in the axial direction when pressed outward in the radial direction in the same manner as the inner lock ring described above. And a plurality of slits extending in the axial direction, and a claw for locking the connecting tube from the outside.

In addition, the constricted portion of the outer lock ring has a shape like a so-called worm, in its cross-sectional shape, and deforms and expands along the inner peripheral surface of the outer cylinder when pressed radially outward. To do. For this reason, a plurality of slits extending along the axial direction penetrating the inner and outer peripheral surfaces are formed around the outer lock ring, so that the constricted portion cannot be broken without being broken in the elastic region of the material. Can be transformed without any problem.

As a result, when the connecting pipe is inserted into the housing of the pipe joint, the constricted part of the outer lock ring is pressed radially outward by the outer peripheral surface of the connecting pipe, and the free end of the outer lock ring is tapered. Deforms to enter the wall area. Then, the free end of the outer lock ring is reduced in diameter so as to press the claw portion provided adjacent to the free end against the outer peripheral surface of the connecting pipe by interaction with the tapered wall of the outer cylinder. For this reason, according to this invention, it can be firmly latched in the accommodating part of a pipe joint, without performing the useless operation of pulling back a connecting pipe to the insertion port side. Further, since the shape of the outer lock ring is not restored after locking, the locking force of the connecting pipe by the outer lock ring is not reduced. When it is desired to remove the connecting pipe, the outer cylinder can be removed, and the lock ring can be unlocked by removing the outer cylinder from the inner cylinder.

Accordingly, the constricted portion of the outer lock ring protrudes from the inner peripheral surface of the outer cylindrical body into the accommodating portion so as to come into contact with the outer peripheral surface when the connecting pipe is inserted into the accommodating portion of the pipe joint. In other words, the constricted portion of the outer lock ring has a shape that partially occupies at least the gap of the accommodating portion by being mounted.

Further, according to the present invention, before the connection pipe is inserted, the inner lock ring and the outer lock ring maintain a bulge shape or a constriction shape with such a length that their free ends do not enter the tapered region. For this reason, the claw portions of the inner and outer lock rings are not inserted into the outer peripheral surface of the inner cylindrical body or the inner peripheral surface of the outer cylindrical body before the connection pipe is inserted. Retreats radially inward or radially outward to a position not locked with the outer peripheral surface.

For this reason, according to the pipe joint of the present invention, when inserting a connecting pipe, like a pipe joint of a type having a conventional movable lock ring and a pipe joint of a type in which an annular lock ring is fixed inside, The inner peripheral surface or outer peripheral surface of the connecting pipe is not damaged by the claw portion of the lock ring. Further, according to the pipe joint of the present invention, a high sealing effect and a high locking force of the connecting pipe can be obtained due to a synergistic effect with a seal ring described later.

In the present invention, the bulging portion of the inner lock ring or the constricted portion of the outer lock ring may be greatly curved so as to come into contact with the inner peripheral surface of the opposing outer cylindrical body or the outer peripheral surface of the inner cylindrical body. Such a shape makes it easy for the connecting tube to abut against the bulging portion or the constricted portion and to press in the radial direction when the connecting tube is inserted into the housing portion. Moreover, since such a shape can take the cross-sectional length of a curved part large, when a bulging part or a constriction part is pressed to radial direction, the free end which has a nail | claw part can be displaced greatly to an axial direction. it can.

On the other hand, when both the inner lock ring and the outer lock ring are used, it is preferable that the bulging portion of the inner lock ring and the constricted portion of the outer lock ring are arranged at positions facing each other. In such an arrangement, when the connecting tube is inserted into the housing portion, the connecting tube is surely and evenly abutted against the bulging portion and the constricted portion. It is allowed to be locked with equal force from both the peripheral surface and the outer peripheral surface. Therefore, in this case, the connection pipe can be fixed in an extremely stable and highly reliable connection regardless of the connection pipe mounting accuracy and manufacturing accuracy.

However, the bulging portion of the inner lock ring or the constricted portion of the outer lock ring is not necessarily in contact with the inner peripheral surface of the opposing outer cylinder or the outer peripheral surface of the inner cylinder, and the inner lock ring and the outer lock Even when both rings are used, it is not necessary that the bulging portion of the inner lock ring and the constriction portion of the outer lock ring are in contact with each other. The bulging part or the constricted part should just protrude in it so that it may occupy at least a part of the gap of the accommodating part.

In the present invention, the material of the lock ring is not particularly limited as long as it is hard and has an appropriate elasticity, but it is preferably molded from a plastic material or a metal material. In particular, when a plastic material is used, a polyphenylsulfone (PPSU) resin or a polyphenylene sulfide (PPS) resin is preferable.

In the present invention, when both the inner lock ring and the outer lock ring are used, the claw portion of the inner lock ring and the claw portion of the outer lock ring are arranged so as to lock the connecting pipe at positions facing each other in the axial direction. Alternatively, the connecting pipes may be locked at different positions in the axial direction.

In the case of the former arrangement, the connecting pipe can be locked from the same position on the inner peripheral surface and the outer peripheral surface, which is advantageous when a relatively strong connection is desired. In the latter arrangement, a seal member such as a seal ring can be arranged at a position facing the claw portion, which is advantageous when high sealing performance is desired.

Therefore, when the seal ring is provided in the latter arrangement of the claw portion, is a groove portion for fixing the seal ring and the seal ring provided at a position facing the claw portion of the outer lock ring on the outer peripheral surface of the inner cylindrical body? Alternatively, it is preferable to provide a seal ring and a groove for fixing the seal ring at a position facing the claw portion of the inner lock ring on the inner peripheral surface of the outer cylinder. In particular, dust and dust are likely to enter the gap between the outer cylinder and the connecting pipe, and the seal ring is also likely to deteriorate. Therefore, when it is desired to ensure a permanent seal, the seal ring is placed on the outer periphery of the inner cylinder inside the connecting pipe. It is more advantageous to provide it on the surface.

Furthermore, in this case, it is more preferable that the claw portion of the outer lock ring facing the seal ring is arranged on the outer side than the claw portion of the inner lock ring in the axial direction. This is because in such an arrangement, the seal ring on the outer peripheral surface of the inner cylinder is inevitably arranged on the outer side in the axial direction from the claw portion of the inner lock ring. This is because the surface is not damaged by the claw portion of the inner lock ring.

The seal ring disposed on the outer peripheral surface of the inner cylindrical body or the inner peripheral surface of the outer cylindrical body and the groove portion thereof are not necessarily disposed in relation to the position of the claw portion opposed to the inner ring body or A plurality of outer cylinders can be arranged on one side.

For example, on the outer peripheral surface of the inner cylinder, two or more seal rings and groove portions may be arranged before and after the inner lock ring, or two or more axially outside from the claw portion of the inner lock ring. It is also possible to arrange the seal ring and its groove. Similarly, two or more seal rings and groove portions may be arranged on the inner peripheral surface of the outer cylindrical body on the front and rear sides of the outer lock ring, or on the outer side in the axial direction from the claw portion of the outer lock ring. It is also possible to arrange two or more seal rings and their grooves. Moreover, a part of two or more seal rings can also be arrange | positioned in the position facing the nail | claw part of an inner side lock ring or an outer side lock ring.

However, the claw portion of the lock ring does not come into contact with the sealing surface of the connecting pipe that may be damaged by the claw portion of the lock ring so that the sealing performance of the at least one seal ring is not deteriorated. It is preferable to dispose more on the outer side in the axial direction.

The outer cylinder of the pipe joint can be loosely slidably fitted in the circumferential direction. When the outer cylinder is attached to the joint body by such a method, it is possible to easily escape bending stress and rotational moment that the connecting pipe receives during or after connection, and to obtain a highly reliable connection. .

It is preferable that the tip of the outer cylinder of the pipe joint protrudes outward from the tip of the inner cylinder in the axial direction. When the pipe joint is subjected to an external impact due to dropping or the like, it is possible to receive the impact with an easily replaceable outer cylinder, and as a result, internal parts such as the inner cylinder are protected. Further, such a structure effectively prevents the inner cylinder from being damaged even when a bending stress or the like is generated in the connecting pipe.

The outer cylinder body of the pipe joint according to the present invention can include an insertion confirmation opening for confirming that the connection pipe has been inserted to a predetermined position of the housing portion. The insertion confirmation opening is an opening penetrating the front and back surfaces of the outer cylindrical body, and is preferably arranged on the inner side of the outer lock ring in the axial direction. Accordingly, it is possible to confirm the insertion of the tip of the connection pipe, and it is possible to confirm that the connection pipe has been completely inserted into the accommodating portion of the pipe joint. In addition, in the insertion confirmation opening, in order to make it easier to confirm the insertion of the connecting pipe, it is a rod-shaped part that protrudes outward in the radial direction when the tip of the connecting pipe comes into contact with the tip. An insertion confirmation means on which a tapered surface is formed can be attached.

The pipe joint receiving portion according to the present invention is an annular component, and one end face (side face) is formed with an annular groove for receiving the tip of the connecting pipe, and the other end face (side face). Can be provided with an insertion guide ring whose edge is chamfered or rounded.

The insertion guide ring covers the tip of the connection pipe when the connection pipe is inserted, and guides the inside of the housing portion of the pipe joint from the outer side in the axial direction toward the inner side. Therefore, the end of the connection pipe is sharply cut off. Even in such a case, the housing portion of the pipe joint such as the inner and outer lock rings or the seal ring is prevented from being damaged by the connecting pipe. Therefore, the insertion guide ring is preferably molded from a material having a smooth surface such as nylon resin.

According to the present invention, there is provided a one-touch type pipe joint that does not require a pulling-back operation of the connecting pipe and that the shape of the lock ring is not restored after locking, so that the locking force of the connecting pipe by the lock ring is not reduced. be able to.

Further, according to the present invention, the connecting pipe housing portion of the pipe joint includes a curved lock ring that deforms so as to extend in the axial direction when pressed in the radial direction, so that the connecting pipe is inserted. A one-touch type pipe joint is provided in which a free end having a claw portion of a lock ring is displaced so as to press an inner peripheral surface and / or an outer peripheral surface of a connecting pipe by interaction with a surrounding tapered wall. be able to.

Furthermore, according to the present invention, the lock ring having protrusions such as teeth or claws is retracted to a position where it does not come into contact with the surface of the connection pipe before the connection pipe is inserted, so that the inner peripheral surface or the outer peripheral surface of the connection pipe. However, after the connection pipe is inserted, it is displaced to a position where it can be firmly inserted into the surface of the connection pipe, so that a high locking force is exerted on the connection pipe. Further, according to the present invention, an unprecedented high sealing effect can be obtained due to a synergistic effect with the seal ring.

It is a perspective view which shows the whole preferable Example of the one-touch-type pipe joint by this invention. It is sectional drawing at the time of cutting out the pipe joint of FIG. 1 in the cross section which passes along a central axis. It is a perspective view which shows partially the inner cylinder body of the pipe joint of FIG. It is sectional drawing at the time of cutting out the inner cylinder body of FIG. 3 in the cross section which passes along a central axis. It is a perspective view which shows the outer cylinder body of the pipe joint of FIG. It is sectional drawing at the time of cutting out the outer cylinder body of FIG. 5 in the cross section which passes along a central axis. It is a perspective view which shows the inner side lock ring of the pipe joint of FIG. It is sectional drawing at the time of cutting out the inner side lock ring of FIG. 7 in the cross section which passes along a central axis. It is a perspective view which shows the outer side lock ring of the pipe joint of FIG. FIG. 10 is a cross-sectional view of the outer lock ring of FIG. 9 taken along a cross section passing through the central axis. It is a fragmentary sectional view at the time of cutting out a part of pipe joint of FIG. 1 in the cross section which passes along a central axis. It is a fragmentary sectional view at the time of cutting out a part of other preferable Example of the one-touch-type pipe joint by this invention in the cross section which passes along a central axis. It is a schematic diagram which shows the usage method of the pipe joint of FIG.

Hereinafter, a one-touch type pipe joint according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the examples shown below, and various modifications can be made without departing from the technical idea of the present invention.

[Example 1]
FIG. 1 shows the entirety of a one-touch type pipe joint 1 according to a preferred embodiment of the present invention. As can be understood with reference to FIG. 1, the pipe joint 1 of the present invention has two connecting pipe insertion sockets 2 in an I-shape. However, the pipe joint of the present invention is not limited to the case of having two connection pipe insertion sockets 2. For example, the connection pipe insertion socket 2 of the present invention is arranged on one side, and a normal receiving port or A case where only one connecting pipe insertion socket 2 is connected such that the outlet is connected, and a case where three or more connecting pipe insertion sockets 2 are connected like a T-shape or a cross shape are included. Moreover, the pipe coupling which combined the connecting pipe insertion socket 2 for different pipe diameters is also included.

The pipe joint 1 is formed of a pipe joint main body 3, an inner cylinder body 4, an outer cylinder body 5, an inner lock ring 6, and an outer lock ring 7, and all the parts have a substantially cylindrical shape. Moreover, in the present Example 1, the pipe coupling main body 3 contains the inner cylinder body 4, and is integrally shape | molded by injection molding (refer FIG. 3). The pipe joint main body 3 and the inner cylinder 4 have a passage opening 30 for flowing a fluid therein, and a tip 31 thereof has a funnel shape in order to reduce the resistance of the fluid. Furthermore, when importance is attached to the productivity and cost of the pipe joint 1, all parts of the pipe joint body 3, the inner cylinder body 4, and the outer cylinder body 5 can be integrally formed by injection molding or the like.

The material of the joint body 3, the inner cylinder 4 and / or the outer cylinder 5 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 a plastic material is used, it is preferably a polyphenylene sulfide (PPS) resin.

As shown in FIG. 2, a flange 41 is formed on the inner side in the axial direction of the inner cylinder 4, and an annular shape formed on the inner peripheral surface 50 of the outer cylinder 5 to the outer edge 42 of the flange 41. By loosely fitting the connecting groove 51, the outer cylinder 5 is mounted slidably and concentrically with respect to the joint body 3 including the inner cylinder 4. An accommodating portion 10 for receiving a connecting pipe is formed between the inner cylinder body 4 and the outer cylinder body 5.

When the outer cylinder 5 is attached to the joint body 3 and the inner cylinder 4 by the above-described method, the bending stress and the rotational moment received by the connecting pipe at the time of connection or after connection can be easily released, and a highly reliable connection is obtained. Will be able to.

Further, the distal end 52 of the outer cylindrical body 5 of the first embodiment projects outward from the distal end 43 of the inner cylindrical body 4 in the axial direction. When the pipe joint 1 is subjected to an external impact due to dropping or the like, it is possible to receive the impact with the easily exchangeable outer cylindrical body 5, and as a result, the internal components such as the inner cylindrical body 4 are protected. In addition, such a structure effectively prevents the inner cylinder 4 from being damaged even when a bending stress or the like is generated in the connecting pipe 1.

And in the accommodating part 10 of the pipe joint 1, the curved inner side lock ring 6 and the outer side lock ring 7 which deform | transform so that it may expand | extend to an axial direction when it presses toward radial direction are the circumferential direction. Mounted slidably and immovably in the axial direction. However, in the present invention, the lock ring does not need to be attached to both the outer peripheral surface 40 of the inner cylinder 4 and the inner peripheral surface 50 of the outer cylinder 5, and may be attached to either one of them. However, considering that one of the lock rings can be damaged by dropping the pipe joint 1, attaching a solvent, or stepping on the pipe joint 1, it is preferable to adopt the form as in the first embodiment.

As shown in FIGS. 3 and 4, a radially parallel fixing wall 44 and a shaft for slidably fixing the inner lock ring 6 are provided on the outer peripheral surface 40 of the inner cylindrical body 4 of the pipe joint 1. A tapered wall 45 that continuously expands toward the outside in the direction is formed. For this reason, the inner lock ring 6 forms a fixed end 60 in which movement in the axial direction is restricted in relation to the fixed wall 44 of the inner cylinder 4, and moves in the axial direction in relation to the tapered wall 45. Can be mounted between the fixed wall 44 and the tapered wall 45 so as to form a free end 61 (see FIG. 2). Although not shown, the inner lock ring is formed by forming a tapered wall in the axially inner side from the fixed wall, and its free end is also formed in the axially inner side from the fixed end. Can be arranged in the opposite direction.

5 and 6, the radial direction for slidably fixing the outer lock ring 7 to the inner peripheral surface 50 of the outer cylinder 5 of the pipe joint 1 of the first embodiment. And a tapered wall 55 that continuously decreases in diameter toward the outside in the axial direction. For this reason, the outer lock ring 7 forms a fixed end 70 whose movement in the axial direction is restricted in relation to the fixed wall 54 of the outer cylinder 5, and moves in the axial direction in relation to the tapered wall 55. Can be mounted between the fixed wall 54 and the tapered wall 55 so as to form a free end 71 (see FIG. 2). Further, a reinforcing rib 56 is provided on the outer peripheral surface 53 of the outer cylindrical body 5 to counter bending stress transmitted from the connecting pipe. Although not shown, the outer lock ring is formed by forming a tapered wall from the fixed wall to the inner side in the axial direction, and its free end is also formed from the fixed end to the inner side in the axial direction. Can be arranged in the opposite direction.

7 and 8 show a perspective view of the inner lock ring 6 used in the pipe joint 1 of the first embodiment and a cross-sectional view of the inner lock ring 6 taken along a cross-section passing through the central axis.

The inner lock ring 6 disposed on the outer peripheral surface 40 of the inner cylindrical body 4 is deformed so as to extend in the axial direction when pressed radially inward, and a bulging portion 62 curved toward the radially outer side. A plurality of slits 63 extending in the axial direction, and a claw portion 64 for locking the connecting pipe from the inside are provided.

The bulging portion 62 of the inner lock ring 6 has a shape like a so-called worm in its cross-sectional shape, and deforms and extends along the outer peripheral surface of the inner cylinder when pressed radially inward. (See FIG. 13). For this reason, a plurality of slits 63 extending along the axial direction penetrating the inner and outer peripheral surfaces are formed around the inner lock ring 6, whereby the bulging portion 62 is broken in the elastic region of the material. It can be transformed without difficulty.

Further, the claw portion 64 of the inner lock ring 6 only needs to have a shape that prevents the connection pipe from coming off rather than pressing the surface of the connection pipe. Or it consists of a hook-shaped protrusion.

As a result, as can be understood with reference to FIG. 13, when the connecting pipe 8 is inserted into the housing part 10 of the pipe joint 1, the bulging part 62 of the inner lock ring 6 is moved to the inner peripheral surface of the connecting pipe 8. It is pressed radially inward by 80 and deformed so that the free end 61 of the inner lock ring 6 enters the tapered wall 45 region. Then, the free end 61 of the inner lock ring 6 interacts with the tapered wall 45 of the inner cylinder 4 so that the claw portion 64 provided adjacent to the free end 61 is connected to the inner peripheral surface 80 of the connecting pipe 8. The diameter is expanded to press. For this reason, according to the pipe joint 1 of the first embodiment, it is possible to firmly lock the connecting pipe 8 in the accommodating portion 10 of the pipe joint 1 without performing a useless operation of pulling the connecting pipe 8 back to the insertion port 11 side. it can. Further, since the shape of the inner lock ring 6 is not restored after locking, the locking force of the connection pipe 8 by the inner lock ring 6 is not reduced.

Therefore, the bulging portion 62 of the inner lock ring 6 is accommodated from the outer peripheral surface 40 of the inner cylindrical body 4 so as to abut against the inner peripheral surface 80 when the connecting pipe 8 is inserted into the accommodating portion 10 of the pipe joint 1. Projecting into part 10. That is, the bulging portion 62 of the inner lock ring 6 has a shape that partially occupies at least the gap of the accommodating portion 10 by the mounting (see FIG. 11).

On the other hand, FIGS. 9 and 10 show a perspective view of the outer lock ring 7 used in the pipe joint 1 of the first embodiment and a cross-sectional view of the outer lock ring 7 taken along a cross section passing through the central axis.

The outer lock ring 7 disposed on the inner peripheral surface 10 of the outer cylindrical body 5 is deformed so as to extend in the axial direction when pressed outward in the radial direction in the same manner as the inner lock ring 6 described above. A constricted portion 72 curved inward in the direction, a plurality of slits 73 extending in the axial direction, and a claw portion 74 for locking the connecting tube 8 from the outside are provided.

In addition, the constricted portion 72 of the outer lock ring 7 has a shape like a so-called lame insect in its cross-sectional shape, and when it is pressed radially outward, it follows the inner peripheral surface 50 of the outer cylindrical body 5. Deforms and stretches. For this reason, a plurality of slits 73 extending along the axial direction penetrating the inner and outer peripheral surfaces are formed around the outer lock ring 7, whereby the constricted portion 72 is broken in the elastic region of the material. It can be transformed without difficulty.

The claw portion 74 of the outer lock ring 7 only needs to have a shape that prevents the connection tube from coming off rather than pressing the surface of the connection tube. Or it consists of a hook-shaped protrusion.

As a result, as can be understood with reference to FIG. 13, when the connecting pipe 8 is inserted into the housing part 10 of the pipe joint 1, the constricted part 72 of the outer lock ring 7 is moved to the outer peripheral surface 81 of the connecting pipe 8. The outer end of the outer lock ring 7 is deformed so as to enter the tapered wall 55 region. Then, the free end 71 of the outer lock ring 7 presses the claw 74 provided adjacent to the free end 71 against the outer peripheral surface 81 of the connecting pipe 8 by interaction with the tapered wall 55 of the outer cylinder 5. Reduce the diameter as follows. For this reason, according to the pipe joint 1 of the first embodiment, it is possible to firmly lock the connecting pipe 8 in the accommodating portion 10 of the pipe joint 1 without performing a useless operation of pulling the connecting pipe 8 back to the insertion port 11 side. it can. Further, since the shape of the outer lock ring 7 is not restored after locking, the locking force of the connection pipe 8 by the outer lock ring 7 is not reduced. If it is desired to remove the connecting pipe 8, the outer cylinder 5 can be removed, and the locking of the lock rings 6, 7 can be released by removing the outer cylinder 5 from the inner cylinder 4.

Accordingly, the constricted portion 72 of the outer lock ring 7 is accommodated from the inner peripheral surface 50 of the outer cylindrical body 5 so as to come into contact with the outer peripheral surface 81 when the connecting pipe 8 is inserted into the accommodating portion 10 of the pipe joint 1. Projecting into part 10. That is, the constricted portion 72 of the outer lock ring 7 has a shape that partially occupies at least the gap of the accommodating portion 10 by the mounting (see FIG. 11).

Further, as understood with reference to FIG. 11, according to the pipe joint 1 of the first embodiment, before the connection pipe 8 is inserted, the inner lock ring 6 and the outer lock ring 7 have their free ends 61, 71. Holds the bulging shape 62 or the constricted shape 72 of a length that does not enter the tapered walls 45 and 55 region. For this reason, the claw portions 64 and 74 of the inner lock ring 6 and the outer lock ring 7 are recessed from the outer peripheral surface 40 of the inner cylinder 4 or the inner peripheral surface 50 of the outer cylinder 5 before the connection pipe 8 is inserted. In other words, the connecting pipe 8 is retreated to the inner side in the radial direction or the outer side in the radial direction to a position where the connecting pipe 8 is not locked with the inner peripheral surface 80 or the outer peripheral surface 81.

For this reason, according to the pipe joint 1 of the first embodiment, the connecting pipe, such as a conventional pipe joint having a movable lock ring or a pipe joint in which an annular lock ring is fixed inside, is used. At the time of insertion, the inner peripheral surface 80 or the outer peripheral surface 81 of the connection pipe 8 is not damaged by the claw portions 64 and 74 of the lock ring. Moreover, according to the pipe joint 1 of the first embodiment, a high sealing effect and a high locking force of the connecting pipe 8 can be obtained due to a synergistic effect with a seal ring described later.

In the pipe joint 1 according to the first embodiment, the bulging portion 62 of the inner lock ring 6 and the constricted portion 72 of the outer lock ring 7 are arranged so as to face each other. This allows the insertion of the ratchet portion 62 and the constricted portion 72 to be surely and evenly abutted when the connecting tube 8 is inserted into the accommodating portion 10, and allows the connecting tube 8 to be locked inside. This is because the ring 6 and the outer lock ring 7 are engaged with both the inner peripheral surface 80 and the outer peripheral surface 81 with equal force. Accordingly, in this case, the connection pipe 8 can be fixed in an extremely stable and highly reliable manner regardless of the mounting accuracy and manufacturing accuracy of the connection tube 8.

However, when the insertion ease of the connecting pipe 8 is more important, the bulging portion 62 of the inner lock ring 6 and the constricted portion 72 of the outer lock ring 7 do not need to be in contact with each other, and each of them is at least the accommodating portion 10. What is necessary is just to protrude in it so that a part of clearance gap may be occupied.

In the pipe joint 1 of the first embodiment, the material of the lock rings 6 and 7 is not particularly limited as long as it is hard and has an appropriate elasticity, but it is formed from a plastic material or a metal material. Is preferred. In particular, when plastic is used, polyphenylsulfone (PPSU) resin or polyphenylene sulfide (PPS) resin is preferable.

In the pipe joint 1 of the first embodiment, the claw portion 64 of the inner lock ring 6 and the claw portion 74 of the outer lock ring 7 are arranged so as to lock the connection pipe 8 at different positions in the axial direction ( FIG. 11). This is because the seal ring 9 can be disposed at a position facing the claw portion 74 as shown in FIG. 13C, which is advantageous when high sealing performance is desired.

Therefore, in the pipe joint 1 according to the first embodiment, the seal ring 9 is disposed at a position facing the claw portion 74 of the outer lock ring 7, so that the seal ring 9 is fixed to the outer peripheral surface 40 of the inner cylindrical body 4. The groove portion 46 is provided. In particular, dust and dust are likely to enter the gap between the outer cylinder 5 and the connecting pipe 8 and the seal ring is likely to deteriorate. Therefore, when it is desired to secure a permanent seal, the seal ring 9 is used as in the first embodiment. It is preferable to provide on the outer peripheral surface 40 of the inner cylinder 4 which is the inner side of the connection pipe 8.

Furthermore, it is more preferable that the claw portion 74 of the outer lock ring 7 facing the seal ring 9 is disposed on the outer side than the claw portion 64 of the inner lock ring 6 in the axial direction. This is because, in such an arrangement, the seal ring 9 on the outer peripheral surface 40 of the inner cylinder is inevitably arranged on the outer side in the axial direction from the claw portion 64 of the inner lock ring 6, so that it is sealed by the seal ring 9. This is because the sealing surface of the connecting pipe 8 is not damaged by the claw portion 64 of the inner lock ring 6.

However, the seal ring disposed on the outer peripheral surface 40 of the inner cylindrical body 4 or the inner peripheral surface 50 of the outer cylindrical body 5 and the groove portion thereof are not necessarily disposed in relation to the position of the claw portion facing them. A plurality of inner cylinders 4 or outer cylinders 5 may be arranged on one side. Therefore, in the pipe joint of the first embodiment, in addition to the above-described seal ring 9 disposed at a position facing the claw portion 74 of the outer lock ring 7, the second seal is located behind the inner lock ring 6. A ring 9 ′ and its groove 46 ′ are arranged (see FIG. 11).

According to the present invention, as shown in FIG. 12, the connecting pipe 8 is locked at a position where the claw portion 64 of the inner lock ring 6 and the claw portion 74 of the outer lock ring 7 face each other in the axial direction. In this case, since the connecting pipe 8 can be locked from the same position where the inner peripheral surface 80 and the outer peripheral surface 81 face each other, it is advantageous when a relatively strong connection is desired. .

As shown in FIGS. 11 and 13, the outer cylindrical body 5 of the pipe joint 1 according to the first embodiment has an insertion confirmation opening 57 for confirming that the connection pipe 8 has been inserted to a predetermined position of the housing portion 10. It has. The insertion confirmation port 57 is an opening penetrating the front and back surfaces of the outer cylindrical body 5 and is arranged on the inner side from the outer lock ring 7 in the axial direction. Further, in the insertion confirmation opening 57, there is a rod-shaped component 101 for making it easier to confirm the insertion of the connection tube 8, and the distal end of the connection tube 8 abuts on the distal end portion 102 so that the radial direction is obtained. An insertion confirmation means 100 having a tapered surface 102 for projecting outward is attached. Note that the insertion confirmation opening 57 and the insertion confirmation means 100 are omitted in other drawings.

Further, the housing portion 10 of the pipe joint 1 according to the first embodiment is an annular component 111 as shown in FIGS. 11 and 13, and one end face (side face) 112 receives the tip of the connecting pipe. The other end surface (side surface) 114 is provided with an insertion guide ring 110 whose edge is chamfered or rounded.

The insertion guide ring 110 covers the tip of the connection pipe 8 when the connection pipe 8 is inserted, and guides the inside of the housing portion 10 of the pipe joint 1 from the outside in the axial direction toward the inside, so that the end of the connection pipe 8 is sharp. Even if it is cut off, the housing 10 of the pipe joint 1 such as the inner and outer lock rings 6, 7 or the seal ring 9 is prevented from being damaged by the connecting pipe 8. Therefore, the insertion guide ring 110 is preferably molded from a material having a smooth surface such as nylon resin. The insertion guide ring 110 is omitted in other drawings.

FIGS. 13A to 13B are schematic views showing how to use the one-touch type pipe joint 1 according to a preferred embodiment of the present invention. (A) shows the state before the connection pipe 8 is inserted, and (b) shows that the tip of the connection pipe 8 is in contact with the bulging part 62 of the inner lock ring 6 and the constricted part 72 of the outer lock ring 7 during the insertion. The state is shown, and (c) shows the state where the insertion and fixing of the connecting pipe are completed.

As shown in FIGS. 13 (a) and 13 (b), the distal end of the connection pipe 8 abuts and is received in the annular groove 113 of the insertion guide ring 110 attached to the insertion port 11 of the pipe joint 1. Then, the inside of the accommodating portion 10 is guided from the axially outer side toward the inner side. When the connecting tube 8 is inserted into the housing portion 10, the bulging portion 62 of the inner lock ring 6 and the constricted portion 72 of the outer lock ring 7 that are in contact with each other in the housing portion 10 are the tip of the connecting tube 8. And it abuts against the insertion guide ring 110 covering it, and is pushed and expanded in the radial direction by them.

At this time, the bulging portion 62 of the inner lock ring 6 is pressed inward in the radial direction by the inner peripheral surface 80 of the connecting pipe 8 and deformed so that the free end 61 of the inner lock ring 6 enters the region of the tapered wall 45. To do. Similarly to the inner lock ring 6, the constricted portion 72 of the outer lock ring 7 is pressed radially outward by the outer peripheral surface 81 of the connecting pipe 8, and the free end 71 of the outer lock ring 7 is tapered to the tapered wall 55 region. (See FIGS. 13B and 13C).

Then, as shown in FIGS. 13B and 13C, the free end 61 of the inner lock ring 6 is adjacent to the free end 61 due to the interaction with the tapered wall 45 of the inner cylinder 4. The provided claw portion 64 is expanded in diameter so as to be pressed against the inner peripheral surface 80 of the connecting pipe 8, and the free end 71 of the outer lock ring 7 is freed by the interaction with the tapered wall 55 of the outer cylindrical body 5. The diameter of the claw 74 provided adjacent to the end 71 is reduced so as to press against the outer peripheral surface 81 of the connecting pipe 8.

As a result, according to the pipe joint 1 of the first embodiment, the connecting pipe 8 is firmly locked in the accommodating portion 10 of the pipe joint 1 without performing a useless operation of pulling back to the insertion port side 11 ( (Refer FIG.13 (c)). Further, since the shapes of the inner lock ring 6 and the outer lock ring 7 are not restored after locking, the locking force of the connection pipe 8 by both the lock rings 6 and 7 is not reduced.

When the distal end of the connection pipe 8 is inserted to a predetermined position in the housing portion 10, the insertion confirmation means 100 provided in the insertion confirmation opening 57 of the outer cylindrical body 5 has a tapered surface 102 at the distal end of the connection pipe 8. To the outside, and informs the operator that the connecting pipe 8 is firmly fixed in the pipe joint 1 of the first embodiment.

1 ························································································································································· 30 ... passage opening 31 ... tip 4 ... inner cylinder 40 ... Outer peripheral surface 41 ... Flange 42 ... Outer edge 43 ... ··································································. ··· Groove 5 ··································································・ Connecting groove 52 ... Tip 53 ... Outer peripheral surface 5 ·················································································· Reinforcement ribs 57 ·················· Insertion Confirmation Opening 6 ······························································· ······················································································································· ... Claw 7 ... Outer lock ring 70 ... Fixed end 71 ... ········ Free end 72 ···········································································・ ・ ・ ・ Claw 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Connection tube 80・ ・ ・ ・ ・ ・ ・ ・ Inner peripheral surface 81 ・ ・ ・ ・ ・ ・ ・ ・ Outer peripheral surface 9, 9 '・ ・ ・ ・ ・ ・ ・ ・ ・ Seal ring 10 ・ ・ ・ ・ ・ ・························································································· Insertion confirmation means 101 -Rod-shaped part 102-Tapered surface 110-Insertion guide ring 111-Ring-shaped part 112, 114 ... End face (side face)
113 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Annular groove

Claims (22)

The fitting body;
A fixed wall that is parallel to the radial direction and a tapered wall that continuously increases in diameter toward the outer side or the inner side in the axial direction are provided on the outer peripheral surface, and the inner wall extends from the joint body toward the outer side in the axial direction. A cylinder,
By mounting on the outer side of the inner cylindrical body, an outer cylindrical body that forms a receiving portion for receiving a connecting pipe between the inner cylindrical body and the axial direction when pressed radially inward. A bulging portion that is deformed so as to be elongated, is curved radially outward so as to partially occupy at least a gap of the housing portion, a plurality of slits extending in the axial direction, and the connecting pipe. A cylindrical inner lock ring having a claw portion for locking from the inner side and disposed so as to be in sliding contact with the outer peripheral surface of the inner cylindrical body between the fixed wall and the tapered wall of the inner cylindrical body In a pipe joint consisting of
When the connecting pipe is received in the receiving part, the bulging part of the inner lock ring is pressed radially inward by the inner peripheral surface of the connecting pipe, and the inner lock ring tapers its free end. In order to be deformed so as to enter the wall region, the free end of the inner lock ring is expanded so as to press the claw portion against the inner peripheral surface of the connection pipe by interaction with the tapered wall of the inner cylinder. The said pipe joint characterized by the above-mentioned. The fitting body;
An inner cylinder extending from the joint body toward the outside in the axial direction;
By having a fixed wall parallel to the radial direction and a taper wall continuously reducing in diameter toward the outer side or the inner side in the axial direction on the inner peripheral surface, and by mounting on the outside of the inner cylinder, An outer cylinder that forms an accommodating portion for receiving the connecting pipe with the inner cylinder, and at least a gap between the accommodating portions that deforms to extend in the axial direction when pressed outward in the radial direction. A constricted portion curved radially inward so as to partially occupy, a plurality of slits extending along the axial direction, and a claw portion for locking the connecting pipe from the outside And a tubular outer lock ring disposed so as to be in sliding contact with the inner peripheral surface of the outer cylindrical body between the fixed wall and the tapered wall of the outer cylindrical body,
When the connecting pipe is received in the receiving part, the constriction of the outer lock ring is pressed radially outward by the outer peripheral surface of the connecting pipe, and the outer lock ring has its free end tapered to the wall. In order to deform so as to enter the region, the free end of the outer lock ring is reduced in diameter so as to press the claw portion against the outer peripheral surface of the connection pipe by interaction with the tapered wall of the outer cylinder. The said pipe joint characterized by the above-mentioned. The fitting body;
A fixed wall that is parallel to the radial direction and a tapered wall that continuously increases in diameter toward the outer side or the inner side in the axial direction are provided on the outer peripheral surface, and the inner wall extends from the joint body toward the outer side in the axial direction. A cylinder,
By having a fixed wall parallel to the radial direction and a taper wall continuously reducing in diameter toward the outer side or the inner side in the axial direction on the inner peripheral surface, and by mounting on the outside of the inner cylinder, An outer cylinder that forms an accommodating portion for receiving a connecting pipe between the inner cylinder and the inner cylinder;
A bulge portion that curves radially outward so as to partially occupy the gap of the housing portion, and deforms so as to extend in the axial direction when pressed inward in the radial direction, along the axial direction A plurality of slits extending and a claw portion for locking the connection pipe from the inside, and an outer peripheral surface of the inner cylinder between the fixed wall and the taper wall of the inner cylinder A cylindrical inner lock ring arranged so as to be in sliding contact, and deformed to extend in the axial direction when pressed radially outward so as to at least partially occupy the gap of the housing portion A constricted portion curved radially inward, a plurality of slits extending in the axial direction, and a claw portion for locking the connecting pipe from the outside, and fixing the outer cylindrical body Between the wall and the taper wall In a pipe joint composed of a cylindrical outer lock ring arranged so as to contact,
When accepting the connection pipe into the receiving portion, the bulge of the inner locking ring are pressed radially inward by the inner peripheral surface of the connecting pipe, and thereby the inner locking ring wherein the free end In order to deform so as to enter the tapered wall region of the inner cylinder, the free end of the inner lock ring interacts with the tapered wall of the inner cylinder so that the claw portion of the inner lock ring is connected to the connecting pipe. It is expanded to press the inner peripheral surface of, and said constricted portion of the outer locking ring is pressed radially outward by the outer peripheral surface of the connecting pipe, and thereby the said outer locking ring its free end to deformed so as to enter the tapered wall region of the outer cylindrical body, the free end of the outer locking ring, by interacting with the tapered wall of the outer tubular member, said outer lock It said fitting, characterized in that the reduced diameter so as to press the claw portion of the ring to the outer peripheral surface of the connecting pipe. The pipe joint according to any one of claims 1 to 3, wherein the joint body and the inner cylindrical body are integrally formed. Before the connection pipe is inserted, the claw part of the inner lock ring is retracted radially inward to a position where it is not locked with the inner peripheral surface of the connection pipe to be inserted, and / or the claw part of the outer lock ring is inserted. The pipe joint according to any one of claims 1 to 4, wherein the pipe joint is retracted radially outward to a position not locked with an outer peripheral surface of the connecting pipe. 5. The pipe joint according to claim 3, wherein the bulging portion of the inner lock ring and the constricted portion of the outer lock ring are disposed at positions facing each other. 5. The claw portion of the inner lock ring and the claw portion of the outer lock ring are arranged so as to lock the connection pipe at positions different from each other in the axial direction. Pipe fittings. The pipe joint according to claim 7, wherein the claw portion of the outer lock ring is disposed on the outer side from the claw portion of the inner lock ring in the axial direction. The outer peripheral surface of the inner cylinder includes a seal ring and a groove for fixing the seal ring at a position facing the claw portion of the outer lock ring. Pipe fittings. 5. The claw part of the inner lock ring and the claw part of the outer lock ring are arranged so as to lock the connection pipe at positions facing each other in the axial direction. Pipe fittings. The pipe joint according to any one of claims 1 to 4, wherein the outer cylinder is attached to the joint body so as to be slidable in a circumferential direction. The pipe joint according to any one of claims 1 to 4, wherein a distal end of the outer cylindrical body protrudes outward from the distal end of the inner cylindrical body in the axial direction. The outer peripheral surface of the inner cylindrical body or the inner peripheral surface of the outer cylindrical body includes a seal ring for sealing a gap with the connection pipe and a groove portion for fixing the seal ring. The pipe joint according to any one of claims 1 to 4. The pipe joint according to claim 13, wherein the seal ring is disposed at a position facing the claw portion of the inner lock ring or the claw portion of the outer lock ring. The pipe joint according to any one of claims 1 to 4, wherein the outer cylinder body is provided with an insertion confirmation opening in the axial direction from the outer lock ring to the inner side. The insertion confirmation opening is provided with rod-shaped insertion confirmation means having a tapered surface for projecting radially outward when the distal end of the connection tube abuts on the distal end portion. The pipe joint according to claim 15. The accommodating portion has one end surface having an annular groove for receiving the tip of the connection pipe, and an edge portion is chamfered or rounded so as not to damage the outer and inner lock rings or the seal ring. And an annular insertion guide ring that covers the tip of the connection pipe and guides the inside of the housing portion from the outside in the axial direction toward the inside when the connection pipe is inserted. The pipe joint according to any one of claims 1 to 4, characterized in that: The pipe joint according to any one of claims 1 to 4, wherein the lock ring is formed from a plastic material or a metal material. The pipe joint according to claim 18, wherein the plastic material is polyphenylsulfone (PPSU) resin or polyphenylene sulfide (PPS) resin. The pipe joint according to any one of claims 1 to 4, wherein the joint body, the inner cylindrical body, and / or the outer cylindrical body are formed from a plastic material or a metal material. The pipe joint according to claim 20, wherein the plastic material is polyphenylene sulfide (PPS) resin. The pipe joint according to any one of claims 1 to 3, wherein the joint body, the inner cylindrical body, and the outer cylindrical body are integrally formed.

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