JP7162183B2 - joint - Google Patents

Description

The present invention relates to a joint for connecting pipes.

2. Description of the Related Art Conventionally, joints used for connecting pipes (connected pipes) are known. The inner peripheral surface of such a joint is provided with a sealing member (packing) that is in close contact with the outer peripheral surface of the inserted connected pipe. Such a seal member may be damaged by the edge of the tip of the pipe to be connected when the pipe to be connected is inserted into the joint, or may be twisted when the pipe to be connected is inserted obliquely.
For example, Patent Document 1 below discloses a pipe provided in a joint body with a scratch-preventing sleeve having a seal ring holding cylindrical portion for holding a seal ring and a connecting pipe end receiving cylindrical portion into which the end of the connecting pipe is inserted. A fitting is disclosed. In addition, the scratch-preventing sleeve forms a stepped portion between the seal ring holding cylinder and the connecting pipe end receiving cylinder, with which the end of the connecting pipe abuts, and the rear end of the connecting pipe end receiving cylinder. is formed into a trumpet shape whose diameter gradually expands rearward. In this pipe joint, when the connecting pipe is inserted into the joint body, and the distal end of the connecting pipe is brought into contact with the stepped portion of the anti-scratch sleeve and further inserted, the anti-scratch sleeve is pushed further into the joint body than the seal ring, A seal ring is configured to be in close contact with the outer peripheral surface of the connection pipe.

JP 2009-2456 A

However, in the pipe joint disclosed in Patent Document 1, the connecting pipe end receiving cylindrical portion, which has a trumpet-like diameter that gradually expands rearward, is moved relative to the seal ring positioned forward of the stepped portion. A seal ring is in close contact with the outer peripheral surface of the connection pipe. As a result, the seal ring is crushed between the trumpet-shaped connection pipe end receiving cylinder and the joint main body, and the load tends to be relatively large when the connection pipe is inserted.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joint capable of reducing the insertion load while protecting the seal member that is in close contact with the outer peripheral surface of the pipe to be connected. and

In order to achieve the above object, a joint according to the present invention comprises a joint body provided with an insertion opening into which an end of a pipe to be connected is inserted on a first end side in the axial direction; The provided seal member is movable in the axial direction with respect to the joint body from a protective position covering the seal member to an exposed position where the seal member is exposed and can be in close contact with the outer peripheral surface of the connected pipe. a protective member comprising: a pushed portion provided on the second end side in the axial direction and pushed by the end portion of the connected pipe toward the exposed position; a cylindrical portion provided on the axial first end side of the pressing portion and covering the sealing member, the inner diameter of the cylindrical portion being larger than the outer diameter of the connected pipe, and the cylindrical portion The outer diameter of the axial first end portion including the portion covering the seal member is smaller than the inner diameter of the portion of the joint body where the cylindrical portion moves in the axial direction, and the shaft of the joint body A recessed step portion is provided on the second end side in the axial direction so as to have a larger inner diameter than that on the first end side in the axial direction, and receives the cylindrical portion. A recessed groove for receiving the seal member is provided over the entire circumference so as to open toward the axial center side on the bottom surface of the step facing the side .

Since the joint according to the present invention is configured as described above, it is possible to reduce the insertion load while protecting the sealing member that is in close contact with the outer peripheral surface of the pipe to be connected.

(a), (b) is a schematic perspective view which shows typically an example of the joint which concerns on one Embodiment of this invention. It is a schematic exploded perspective view of the joint. It is a schematic exploded perspective view of the joint. (a) is a schematic rear view of the joint, (b) is a schematic rear view showing an example of an outer cylindrical member constituting an operating member provided in the joint, and (c) is a joint provided in the joint. FIG. 4 is a schematic rear view schematically showing an example of an inner cylinder member and a protective member (informing member) that constitute the main body; 4A is a schematic side view of the joint, and FIG. 4B is a schematic longitudinal sectional view corresponding to the line X1-X1 in FIG. 4A. (a) and (b) are schematic longitudinal sectional views corresponding to FIG. 5(b). (a) is a schematic side view of the joint, and (b) is a schematic vertical cross-sectional view corresponding to the X2-X2 arrow view in (a). (a) is a schematic side view of the same joint, and (b) is a schematic vertical cross-sectional view corresponding to the X3-X3 line arrow view in (a).

An embodiment of the present invention will be described below with reference to the drawings.
It should be noted that some of the detailed reference numerals attached to other drawings are omitted in some of the drawings.
1 to 8 are diagrams schematically showing an example of a joint according to this embodiment.
As shown in FIGS. 1 and 5, the joint 1 according to the present embodiment comprises a joint body 2 provided with an insertion port 21 into which an end portion 9 of a connected pipe 8 is inserted on the first end side in the axial direction. An inner cylindrical member 20 is provided.

The connected pipe 8 connected to the joint 1 may be made of an appropriate material according to the type of fluid to be passed through the connected pipe 8 or the like. For example, the connected pipe 8 may be a resin pipe mainly made of a synthetic resin material such as polyvinyl chloride resin, or a metal pipe made of a metal material such as stainless steel. Further, the connected pipe 8 may be used as a pipe through which liquid such as water or gas such as gas passes, and may constitute, for example, a drain pipe having a relatively large diameter.
Further, an appropriate tubular member may be fixedly provided on the axial second end side of the joint 1 . Further, the axial second end portions of the two joints 1, 1 according to the present embodiment may be connected to each other by an appropriate tubular member. For example, the axial second ends of the two joints 1, 1 may be connected to each other by an elbow-shaped or flexible tubular member.

The joint 1 also includes a protective member 10 that is axially movable with respect to the inner cylindrical member 20 . The protective member 10 is axially movable with respect to the inner cylindrical member 20 between an initial position on the first axial end side and a connection completion position on the second axial end side. When it reaches the connection completion position by being pushed by the connected pipe 8 inserted therein, it constitutes a notification member that notifies the connection completion state. With such a configuration, the operator can be made to recognize that the connected pipe 8 has been inserted to a predetermined position and the connection has been completed.
Further, in the present embodiment, the joint 1 is rotatable about the axis with respect to the inner cylinder member 20, and the protective member 10 moves from the connection completion position as the joint 1 rotates relative to the inner cylinder member 20 in one direction. It has an outer cylinder member 30 that constitutes an operating member that moves toward the initial position. With such a configuration, by rotating the outer cylinder member 30 relative to the inner cylinder member 20, the protection member 10 that has been set to the connection completion position can be easily returned to the initial position. As a result, when reconnecting the connected pipe 8 to the joint 1, workability can be improved as compared with the case where the protective member 10 needs to be disassembled and returned to its initial position.

The joint 1 also includes a seal member (peripheral surface seal member) 4 provided on the inner peripheral side of the inner cylindrical member 20 .
The protective member 10 can move from a protective position covering the peripheral seal member 4 to an exposed position where the peripheral seal member 4 can be exposed and brought into close contact with the outer peripheral surface 8 a of the connected pipe 8 . The protection member 10 includes a pushed portion 15 provided on the second axial end side and pushed toward the exposed position by the end portion 9 of the connected pipe 8 , and a first axial portion of the pushed portion 15 . and a cylindrical portion 11 provided on the end side and covering the peripheral surface seal member 4 . With such a configuration, when the connected pipe 8 is inserted, the peripheral surface seal member 4 is covered with the protection member 10 in the protective position, so that the tip of the connected pipe 8 is prevented from touching the peripheral surface seal member 4 . It can be inserted in a non-contact state against the peripheral surface seal member 4, and damage, twisting, etc. of the peripheral surface seal member 4 can be prevented. In this embodiment, the protective position of the protective member 10 is the initial position on the first axial end side, and the exposed position of the protective member 10 is the connection completion position on the second axial end side. That is, the state where the peripheral seal member 4 is protected by the protective member 10 is the initial position, and the connection completed position is the state where the peripheral seal member 4 is exposed and can be brought into close contact with the outer peripheral surface 8a of the connected pipe 8. It is said that With such a configuration, when the protection member 10 constituting the notification member reaches the connection completion position (exposed position), a notification is given, so that the operator can be made to recognize that the properly sealed state has been established. .

Further, the inner diameter of the cylindrical portion 11 is made larger than the outer diameter of the connected pipe 8, and the outer diameter of the first axial end portion of the cylindrical portion 11 including the portion covering the peripheral surface seal member 4 is set to the inner diameter of the inner cylindrical member. The inner diameter of the recessed stepped portion 24, which will be described later, is smaller than the portion in which the cylindrical portion 11 of 20 moves in the axial direction. With such a configuration, the connected pipe 8 can be easily inserted into the cylindrical portion 11 of the protective member 10 that protects the peripheral seal member 4 . In addition, the protection member 10 can be easily moved with respect to the inner cylindrical member 20 together with the connected pipe 8, and the load required when inserting the connected pipe 8 (insertion load) can be reduced.
As shown in FIGS. 2 and 3, the cylindrical portion 11 of the protective member 10 has a substantially cylindrical shape penetrating in the axial direction. The inner diameter of the tubular portion 11 refers to the inner diameter of the smallest diameter portion of the tubular portion 11. In the present embodiment, as shown in FIG. It has the same diameter over substantially the entirety. With such a configuration, when inserting the connected pipe 8, it is easier to insert the connected pipe 8 than in the case where the cylindrical portion 11 has a projecting step portion, a recessed step portion, a bent portion, etc. It is possible to further improve the insertability of the connected pipe 8 into the cylindrical portion 11 without being caught. The inner diameter of the tubular portion 11 may be slightly larger than the outer diameter of the connected pipe 8 .

The cylindrical portion 11 has a chamfered inclined surface formed on the inner peripheral side edge of the axial first end portion on the insertion side of the connected pipe 8, and the axial direction first end portion is The inner diameter of the inner peripheral edge portion may be larger than the inner diameter of the second end in the axial direction. In other words, the tubular portion 11 may be provided with a portion at the first axial end portion which is larger than the inner diameter of the second axial end side. In this case, the dimension along the axial direction of the inclined surface of the inner peripheral side edge of the first axial end portion may be 1/4 or less of the dimension along the axial direction of the cylindrical portion 11 . The fact that the inner diameter of the tubular portion 11 is the same over substantially the entire axial direction may include the case where such an inclined surface is provided. Further, instead of making the inner diameter of the tubular portion 11 uniform over substantially the entire axial direction, the inner diameter slightly expands from the axial second end portion toward the axial first end portion. It may be in an open form.

Further, the outer diameter of the first axial end portion of the cylindrical portion 11 including the portion covering the peripheral seal member 4 indicates the outer diameter of the maximum diameter portion of the portion. The outer diameter of the first axial end portion of the portion 11 is made uniform over substantially the entirety of the first axial end portion in the axial direction. With such a configuration, there are a projecting stepped portion, a recessed stepped portion, a bent portion, etc. for crushing the peripheral surface seal member 4 in an axially middle portion on the outer peripheral side of the first axial end side portion of the tubular portion 11 . Compared with such a structure, the tubular portion 11 can be moved smoothly in the axial direction with respect to the peripheral surface seal member 4 . In addition, it is possible to more effectively suppress twisting of the peripheral surface seal member 4 and the like. The outer diameter of the first end portion of the tubular portion 11 may be slightly smaller than the inner diameter of the portion of the inner cylindrical member 20 where the recessed stepped portion 24 is formed.
In addition, in the illustrated example, a chamfered inclined surface is provided on the outer peripheral side edge of the first axial end of the cylindrical portion 11, and the outer diameter of the outer peripheral side edge of the first axial end is reduced to the first axial direction. An example is shown in which the outer diameter is smaller than the outer diameter of the two ends. With such a configuration, when the protective member 10 is moved from the exposed position to the protective position, as will be described later, the axial first end portion of the cylindrical portion 11 is less likely to be caught by the peripheral surface seal member 4 . can. In other words, the cylindrical portion 11 may be provided with a portion at the axial first end portion having a smaller outer diameter than the axial second end side. In this case, the dimension along the axial direction of the inclined surface of the outer peripheral side edge of the first axial end portion may be 1/4 or less of the dimension along the axial direction of the cylindrical portion 11 . The expression that the outer diameter of the first axial end portion of the cylindrical portion 11 is the same over substantially the entire axial direction includes the case where such an inclined surface is provided. good. Note that a configuration in which such an inclined surface is not provided on the outer peripheral side edge of the first end in the axial direction of the tubular portion 11 may be adopted.

The pressed portion 15 of the protective member 10 is provided in a continuous manner on the tubular portion 11 so as to protrude from the axial second end portion of the tubular portion 11 toward the axial center side. In the present embodiment, the pressed portion 15 is provided in an annular shape along the entire periphery of the axial second end portion of the cylindrical portion 11 (see also FIG. 4A). Note that instead of such a mode, a configuration in which the pressed portion 15 is provided only on a part of the peripheral edge of the axial second end portion of the tubular portion 11 may be employed.
The end surface of the end portion 9 of the connected pipe 8 is brought into contact with the surface of the pressed portion 15 facing the first end in the axial direction, and as the connected pipe 8 is inserted, the protective member 10 is moved to the second axial direction. It is moved toward the end side, that is, the exposed position (connection completion position).
Moreover, as shown in FIG. 6(b), the opening defined by the pressed portion 15 is formed on the second axial end side of the connected pipe 8 and the joint 1 in a state where the connected pipe 8 is connected. and are configured to communicate with each other. In addition, the inner diameter of the opening defined by the pressed portion 15 is substantially the same as the inner diameter of the connected pipe 8 and the axial second end portion of the joint 1 . Note that the inner diameter of the opening defined by the pressed portion 15, the inner diameter of the connected pipe 8, and the inner diameter of the axial second end portion of the joint 1 are not limited to substantially the same diameter, and are different. A diameter may be used.

Further, in the present embodiment, the engaging portion 13 of the protective member 10 and the inner cylinder member 20 constitutes a click mechanism that gives a click feeling when the protective member 10 reaches the exposed position where the peripheral surface seal member 4 is exposed. and an engaged portion 28 are provided. With such a configuration, the protective member 10 is at the exposed position, and the worker can sensuously (tactilely) recognize the state in which the peripheral surface seal member 4 is in close contact with the outer peripheral surface 8 a of the connected pipe 8 . . As a result, insufficient insertion and insufficient sealing can be suppressed, and the need to mark the connected pipe 8 with a marker or the like before insertion can be eliminated.
Further, in this embodiment, when the protective member 10 reaches the connection completion position, the engaging portion 13 engages with the engaged portion 28 of the inner cylindrical member 20 to give a click feeling, thereby indicating the connection completion state. It is configured to be notified. With such a configuration, even if the connection site is dark or noisy, compared to the case where the worker can visually or aurally recognize the connection completion state, the connection completion state can be sensed (tactilely). ) to make the operator aware of the connection completion state. That is, the engaging portion 13 and the engaged portion 28 constitute a click mechanism that gives a click feeling when the protective member 10 is at the exposed position and the connection completed position.

As shown in FIGS. 2 and 5B, the engaging portion 13 is provided on the outer peripheral edge portion of the axial second end portion of the tubular portion 11 . The engaging portion 13 has a substantially triangular shape (substantially mountain-like shape) that tapers toward the outer side in the radial direction when viewed in the circumferential direction. The engaged portion 28 of the inner cylindrical member 20 is provided at the distal end portion of a projecting piece portion 27 provided to extend from the axial second end portion of the inner cylindrical member 20 toward the axial second end side. there is The protruding piece 27 has a plate-like shape with its thickness extending along the radial direction. The engaged portion 28 is provided so as to protrude from the distal end portion of the projecting piece portion 27 toward the axial center side, and has a substantially triangular shape (substantially mountain-like shape) that tapers toward the axial center side when viewed in the circumferential direction. ).
As shown in FIGS. 6A and 6B, the engaging portion 13 of the protective member 10 moving the engaged portion 28 toward the exposed position (connection completion position) causes elastic deformation of the projecting piece portion 27. As shown in FIGS. A click feeling is given when moving to get over with. Similarly, when the protective member 10 moves toward the protective position (initial position), the engaging portion 13 overcomes the engaged portion 28 with the elastic deformation of the protruding portion 27, and the protective member 10 moves to the protective position. (initial position). A space is provided on the radially outer side of the protruding piece 27 to allow the radially outward elastic deformation of the protruding piece 27 .

Further, the protective member 10 is provided with a concave portion 12 for receiving the engaged portion 28 in the exposed position (connection completion position). The recess 12 is provided so as to be adjacent to the first end in the axial direction of the engaging portion 13 and open radially outward on the outer peripheral surface of the cylindrical portion 11 . In the illustrated example, the concave portion 12 is a hole penetrating through the cylindrical portion 11 in the thickness direction (radial direction).
Further, in this embodiment, as shown in FIGS. 2 and 3, the engaging portion 13 and the recessed portion 12 of the protective member 10 and the projecting portion 27 and the engaged portion 28 of the inner cylindrical member 20 are spaced apart in the circumferential direction. are provided at a plurality of locations (three locations in the example shown). Alternatively, only one engaging portion 13 and one concave portion 12 of the protective member 10 and one protruding piece portion 27 and one engaged portion 28 of the inner cylindrical member 20 may be provided.

In addition, as shown in FIGS. 2 and 3 , the protection member 10 is provided with a rotation restraint portion 14 that restrains rotation of the protection member 10 relative to the inner cylindrical member 20 about the axis. In the present embodiment, an example is shown in which the rotation suppressing portion 14 is a protrusion arranged along both circumferential sides of each projecting piece portion 27 . In other words, the protection member 10 is prevented from rotating about its axis relative to the inner cylinder member 20 by the rotation restraint portions 14, 14 on both circumferential sides of the projecting piece portion 27. As shown in FIG.
These anti-rotation portions 14, 14 on both sides protrude radially outward from the outer peripheral surface of the second axial end portion of the cylindrical portion 11, and extend axially along both side edges of each recess 12. provided to extend in the direction Further, in the example of the drawing, an example is shown in which a concave portion is provided at the proximal end portion of each projecting piece portion 27 to receive a portion of the rotation restraint portion 14 of the protective member 10 at the protective position. The rotation restraint portion 14 for restraining the rotation of the protection member 10 with respect to the inner cylindrical member 20 is not limited to the structure described above, and various other structures may be used.

As shown in FIGS. 2, 3, and 5B, the inner cylinder member 20 has a substantially cylindrical shape penetrating in the axial direction concentrically with the protection member 10 so as to enclose the protection member 10 therein. The opening of the inner cylindrical member 20 on the axial first end side constitutes the insertion port 21 of the joint 1 (joint main body 2).
In this embodiment, the inner cylinder member 20 is formed in a stepped shape on the axial second end side so that the inner diameter is larger than that on the axial direction first end side, and receives the tubular portion 11 of the protective member 10 . It has a configuration in which a recessed stepped portion 24 is provided. With such a configuration, the tip of the connected pipe 8 inserted from the first end in the axial direction, which is the side of the insertion port 21 , is less likely to be caught by the cylindrical portion 11 , and the connected pipe 8 with respect to the cylindrical portion 11 is less likely to be caught. Insertability can be further improved. In addition, the cylindrical portion 11 is stably attached to the inner cylindrical member 20 as compared with the case where the cylindrical portion 11 is arranged on the inner peripheral side of the inner cylindrical member 20 without providing such a recessed stepped portion 24 . can be moved.

The inner diameter of the first axial end portion of the inner cylindrical member 20 is set to correspond to the outer diameter of the connected pipe 8 . The inner diameter of the first axial end portion of the inner cylindrical member 20 may be slightly larger than the outer diameter of the connected pipe 8 . The inner diameter of the first axial end portion of the inner cylindrical member 20 is the same throughout substantially the entire axial direction. It should be noted that an appropriate chamfered inclined surface or the like may be provided on the periphery of the opening of the insertion port 21 .
The inner diameter of the second axial end portion of the inner cylindrical member 20 where the recessed stepped portion 24 is provided is set to the outer diameter of the cylindrical portion 11 (the rotation suppressing portion 14 is larger than the outer diameter of the cylindrical portion 11 so that the cylindrical portion 11 can be received). outside diameter of the removed part). In addition, the inner diameter of the axial second end portion of the inner cylindrical member 20 where the recessed stepped portion 24 is provided is substantially the same throughout the entire axial direction. In the present embodiment, the inner peripheral surface of the tubular portion 11 and the inner peripheral surface of the first axial end portion of the inner tubular member 20 are formed along the radial direction of the recessed stepped portion 24 so that they have substantially the same curved surface shape. An example in which the step size is approximately the same as the thickness size of the cylindrical portion 11 is shown. Further, as shown in FIG. 5(b), on the stepped wall surface facing the second axial end side of the recessed stepped portion 24, the cylindrical portion 11 of the protective member 10 positioned at the protective position has a first axial end side portion. are abutted or closely faced.

Further, in this embodiment, the inner cylindrical member 20 is provided with a concave groove 25 for receiving the peripheral surface seal member 4 over the entire circumference. With such a configuration, it is possible to suppress movement, twisting, and the like of the peripheral seal member 4 when the cylindrical portion 11 is moved with respect to the peripheral seal member 4 . In addition, since the outer diameter of the first axial end portion of the cylindrical portion 11 is the same throughout substantially the entire axial direction, compared to a trumpet-shaped portion, the distance from the exposed position to the protected position is greater. When the protective member 10 is moved by pressing, the tubular portion 11 is less likely to be caught by the peripheral surface seal member 4 accommodated in the groove 25 . Thereby, the protection member 10 can be smoothly moved toward the protection position.
The recessed groove 25 is provided so as to open toward the axial center side on the bottom surface facing the axial center side of the recessed stepped portion 24 forming the inner peripheral surface of the axial second end side portion of the inner cylinder member 20 . ing. In the illustrated example, the recessed groove 25 has a substantially rectangular groove shape when viewed in the circumferential direction.

As shown in FIG. 5B, the concave groove 25 is configured such that the opening on the axial side is covered over the entire circumference by the cylindrical portion 11 of the protective member 10 at the protective position. In other words, when the protective member 10 is in the protective position, the tubular portion 11 is positioned on the inner peripheral side of the peripheral seal member 4 over the entire circumference, and the peripheral seal member 4 is covered with the tubular portion 11 . Become.
The peripheral seal member 4 accommodated in the groove 25 is annular, and as shown in FIG. 6B, when the protection member 10 is in the exposed position, it is elastically restored from the opening of the groove 25 to the axial center. It protrudes toward the side and closely contacts the outer peripheral surface 8 a of the connected pipe 8 . The shape of the peripheral surface seal member 4 is such that it adheres closely to the outer peripheral surface 8a of the connected pipe 8 to ensure sealing performance, and the cylindrical portion 11 of the protective member 10 that moves toward the protective position has a shape that is It may have an appropriate shape so that it is difficult to get caught. The figure shows an example in which the peripheral surface seal member 4 is formed in a substantially U-shape opening toward the first end in the axial direction when viewed in the circumferential direction. Moreover, the peripheral surface seal member 4 may be made of an appropriate material according to the type of fluid to be passed through the connected pipe 8 or the like. The peripheral seal member 4 may be made of a soft synthetic resin material, rubber, various elastomer materials, or the like.

Further, in this embodiment, the inner cylindrical member 20 is provided with the retaining member 5 that suppresses the movement of the connected tube 8 inserted thereinto in the extraction direction (the first end in the axial direction). The retainer member 5 has a distal end portion 6 that protrudes toward the axial center from the inner peripheral surface of the first axial end portion of the inner cylindrical member 20 . The distal end portion 6 abuts the outer peripheral surface 8a of the connected pipe 8 so as to bite into it, and movement of the connected pipe 8 in the extraction direction is suppressed. In addition, the retainer member 5 is in the form of a thin plate whose thickness direction is generally along the axial direction. Further, in the example shown in the figure, an example in which notch-shaped recesses are provided alternately in the circumferential direction on the axial center side and the radial outer side so as to open respectively on the axial center side and the radial outer side of the retaining member 5 is shown. showing. In addition, the retaining member 5 can suppress the movement of the connected pipe 8 in the extraction direction, and at the same time, can be easily inserted when the connected pipe 8 is inserted. It is provided so as to incline toward.

In this embodiment, the inner cylindrical member 20 is provided with a housing recess 23 for housing the retaining member 5 so that the distal end portion 6 of the retaining member 5 is exposed on the inner peripheral surface. Further, the accommodation recess 23 is formed in a slit shape extending in the circumferential direction through the inner cylindrical member 20 in the radial direction (thickness direction). In addition, the accommodation recess 23 is provided in an inclined shape that is inclined toward the axial direction second end side as it goes toward the axial center side.
Further, the accommodation recess 23 is provided so as to allow elastic deformation of the distal end portion of the retainer member 5 toward the second end in the axial direction when the connected pipe 8 is inserted. Further, the accommodation recess 23 is configured to allow movement of the retainer member 5 radially outward.

In addition, on the inner peripheral side of this accommodation recess 23, the retainer member 5 is held so as to suppress the movement toward the axial center side with the tip portion 6 protruding slightly from the inner peripheral surface of the inner cylindrical member 20. department is provided. The drawing shows an example in which retained portions 7, 7 protruding in the circumferential direction are provided on both circumferential sides of the radially outer portion of the retaining member 5. As shown in FIG. On both inner edges of the housing recess 23 in the circumferential direction, there are provided protrusion-like holding portions for holding the held portions 7 and 7 of the retaining member 5 . Further, a holding portion and a held portion may be provided in the housing recess 23 and the retaining member 5 to suppress the movement of the retaining member 5 in the circumferential direction toward the axial center side.
Moreover, in this embodiment, as shown in FIGS. It has a configuration in which it is provided at a plurality of locations (three locations in the example shown). Note that, instead of such a mode, a configuration in which only one retaining member 5 and one accommodation recess 23 are provided may be employed.

Further, in the present embodiment, the inner cylinder member 20 is provided with a protrusion 22 that serves as a finger hook when the inner cylinder member 20 is rotated relative to the outer cylinder member 30 . The protrusion 22 is provided to protrude radially outward from the outer peripheral side of the axial first end of the inner cylinder member 20 . Further, the protrusion 22 protrudes radially outward from the outer peripheral surface of the outer cylindrical member 30 so that it can be hooked with a finger. In addition, the inner cylindrical member 20 is provided with a plurality of (three in the figure) protrusions 22 spaced apart in the circumferential direction. In addition, instead of such a mode, a configuration in which only one protrusion 22 is provided may be employed.
Further, in the present embodiment, the joint 1 is provided with an inter-cylinder seal member 3 for sealing between the inner cylinder member 20 and the outer cylinder member 30 . In the present embodiment, a concave groove 26 for accommodating the inter-cylinder seal member 3 is provided in the axial second end portion of the inner cylinder member 20 over the entire circumference.

The concave groove 26 is provided so as to open toward the axial second end side on the axial second end surface in the vicinity of the base end portion of the projecting piece portion 27 of the inner cylindrical member 20 . The illustrated example shows an example in which the groove 26 has a substantially rectangular groove shape when viewed in the circumferential direction.
The inter-cylinder seal member 3 accommodated in the recessed groove 26 has an annular shape, and as shown in FIG. It is configured to be in close contact with the wall surface 36 . The shape of the cylinder-to-cylinder seal member 3 may be an appropriate shape so as to ensure sealing performance, as in the case described above. The figure shows an example in which the inter-cylinder sealing member 3 is in the shape of an O-ring that is substantially circular when viewed in the circumferential direction. Further, the inter-cylinder seal member 3 is made of an appropriate material such as a soft synthetic resin material, rubber, various elastomer materials, etc., in accordance with the type of fluid to be passed through the connected pipe 8, as described above. Anything is fine.
The inside of the connected pipe 8 and the inside of the joint 1 are sealed from the outside of the joint 1 by the inter-cylinder seal member 3 and the peripheral surface seal member 4 .

In this embodiment, the outer cylinder member 30 moves toward the first position that prevents the protection member 10 from moving toward the exposure position (connection completion position), which is the protection position (initial position), and to the exposure position of the protection member 10 . relative to the inner cylindrical member 20 to the second position that allows the movement of the . Further, on the outer peripheral side of the joint 1, as shown in FIGS. 7(a) and 8(a), a display portion 29 for displaying the first position and the second position of the outer cylinder member 30 with respect to the inner cylinder member 20 is provided. It is configured with With such a configuration, when the outer cylinder member 30 is rotated relative to the inner cylinder member 20 to bring the protection member 10 into the protection position, the protection member 10 becomes the protection position. The operator can be made to recognize by the display unit 29 that the has reached the first position. Further, after the first position is set in this way, when the outer cylinder member 30 is rotated relative to the inner cylinder member 20 to allow the protection member 10 to move to the exposed position side, the protection member 10 is exposed. A worker can be made to recognize by the display part 29 that the outer cylinder member 30 which becomes movable to the position side has become the 2nd position. In this embodiment, the display portion 29 is provided on the inner cylindrical member 20 . A specific configuration of the display unit 29 will be described later.

As shown in FIGS. 2, 3 and 5(b), the outer cylinder member 30 has a substantially cylindrical shape that penetrates in the axial direction concentrically with the inner cylinder member 20 so as to internally accommodate the inner cylinder member 20. ing. In addition, the outer cylinder member 30 includes an inner cylinder receiving portion 37 at a first axial end portion that accommodates the inner cylinder member 20 and a second cylindrical end portion that constitutes a second axial end portion of the joint 1 . 31 and an intermediate tubular portion 35 provided between the second end tubular portion 31 and the inner tube receiving portion 37 . The stepped wall surface 36 to which the inter-cylinder seal member 3 is brought into close contact constitutes a stepped portion on the inner peripheral side between the intermediate cylindrical portion 35 and the inner cylinder receiving portion 37 .
The second end tubular portion 31 has an outer diameter and an inner diameter smaller than those of the intermediate tubular portion 35 . As shown in FIG. 6B, the inner diameter of the second end tubular portion 31 is substantially the same as the inner diameter of the connected pipe 8 in this embodiment. The above-described exposure position (connection completion position) and The surface of the pressed portion 15 of the protected member 10 facing toward the second end in the axial direction comes into contact or closely faces. When the connected pipe 8 is inserted, the inner peripheral surfaces of the second end cylindrical portion 31, the pressed portion 15, and the connected pipe 8, which have substantially the same inner diameter, are connected to each other in substantially the same curved shape. are distributed as follows. With such a configuration, the pressure loss at the joint 1 portion of the fluid flowing through the connected pipe 8 can be reduced.

Further, in the present embodiment, as shown in FIGS. 7B and 8B, the outer cylinder member 30 is rotated in one direction relative to the inner cylinder member 20. In this configuration, an inclined guide surface 34 is provided that contacts the contacted portion (the inclined guided surface 17) of the protective member 10 when the protective member 10 is moved. The inclined guide surface 34 abuts on the abutted portion (the inclined guided surface 17) of the protective member 10 when the outer cylinder member 30 is rotated in one direction relative to the inner cylinder member 20. The protection member 10 is moved from the connection completion position toward the initial position. With such a configuration, the protective member 10 can be smoothly moved toward the initial position by the guiding action of the inclined guide surface 34 .

Further, in this embodiment, the abutted portion of the protective member 10 is an inclined guided surface 17 provided in parallel with the inclined guide surface 34 of the outer cylindrical member 30 . With such a configuration, the protective member 10 can be moved more smoothly toward the initial position by the mutual guiding action of the inclined guide surface 34 and the inclined guided surface 17 . Here, the inclined guide surface 34 and the inclined guided surface 17 do not need to be completely parallel. It should be possible to move toward For example, the inclination angles may differ from each other by about 20 degrees.
In addition, in this embodiment, the inclined guide surface 34 of the outer cylinder member 30 and the inclined guided surface 17 of the protective member 10 are provided at a plurality of locations (three locations in the figure) spaced apart in the circumferential direction. and With such a configuration, the protective member 10 can be moved more smoothly toward the initial position by the mutual guiding action of the inclined guide surfaces 34 and the inclined guided surfaces 17 provided at a plurality of locations in the circumferential direction. can. Since the plurality of inclined guide surfaces 34 and inclined guided surfaces 17 have the same configuration, one of them will be described below as an example.

As shown in FIGS. 2, 3 and 8(b), the inclined guided surface 17 of the protective member 10 extends from the surface facing the second axial end of the pressed portion 15 of the protective member 10 to the axial second end. It is the projecting direction tip surface of the guided projecting piece portion 16 provided so as to project toward the two end side. The projected piece portion 16 to be guided is configured such that the thickness direction is along the radial direction. In addition, the projected piece portion 16 to be guided may be formed in a substantially circular arc shape that is substantially concentric with the protective member 10 when viewed in the axial direction.
The inclined guided surface 17 is provided so as to incline toward the axial first end side from the circumferential one side edge of the guided projecting piece portion 16 toward the circumferential other side edge.

The inclined guide surface 34 of the outer cylindrical member 30 is the bottom surface facing the first end in the axial direction of the guide recess 33 that opens in the stepped wall surface 32 so as to receive the guided projecting piece portion 16 of the protective member 10 .
As shown in FIGS. 7(b) and 8(b), the guide recess 33 has an outer diameter larger than that of the axially second end portion of the second cylindrical end portion 31 and a thickness thereof. It is provided at the enlarged axial first end portion. Moreover, as shown in FIG. 4(b), the guide recess 33 is provided so as to extend in the circumferential direction. The illustrated example shows an example in which the guide recess 33 has a substantially quarter arc shape when viewed in the axial direction.
The inclined guide surface 34 forming the bottom surface of the guide recess 33 is provided so as to incline from the deepest portion 34a on one side in the circumferential direction toward the other side in the circumferential direction toward the first end in the axial direction. The other side edge is a boundary edge 34 b with the step wall surface 32 . That is, the guide recess 33 is formed so that the depth dimension along the axial direction decreases from the deepest portion 34a on one side in the circumferential direction toward the boundary edge portion 34b on the other side in the circumferential direction. The axial dimension from the deepest portion 34a of the guide recess 33 to the boundary edge 34b corresponds to the axial movement dimension of the protective member 10 moved from the exposed position to the protected position. . Instead of providing the inclined guide surface 34 of the outer cylindrical member 30 and the inclined guided surface 17 of the protective member 10 at a plurality of locations, only one of each of these may be provided. Further, the portion to be abutted against the inclined guide surface 34 of the outer cylindrical member 30 is not limited to the inclined guided surface 17, and may be a surface having a convex curved surface shape, and other various modifications are possible. is.

The intermediate tubular portion 35 is provided so as to receive the protrusion portion 27 of the inner tubular member 20 described above. The inner diameter of the intermediate cylindrical portion 35 is set to an appropriate diameter so as to form a space that allows elastic deformation of the projecting piece portion 27 radially outward.
The inner cylinder receiving portion 37 has an inner diameter corresponding to the outer diameter of the inner cylinder member 20 so that the inner cylinder member 20 can be received. The inner diameter of the inner cylinder receiving portion 37 may be slightly larger than the outer diameter of the inner cylinder member 20 .
Further, in the present embodiment, at a position where the inner cylinder member 20 is moved toward the first end in the axial direction with respect to the inner cylinder receiving portion 37 (extractable position), the retainer member 5 is moved radially outward. The inner cylinder receiving portion 37 is provided with a recessed stepped portion 38 that forms a space for allowing the . The recessed stepped portion 38 is provided on the inner peripheral side of the first axial end portion of the inner cylinder receiving portion 37 in a stepped shape so that the inner diameter is larger than that of the second axial end portion.

Further, the inner cylinder receiving portion 37 is provided with a guide opening 39 for guiding and exposing the display portion 29 of the inner cylinder member 20 that is moved relative to the outer cylinder member 30 . . The display portion 29 of the inner cylinder member 20 is formed in the shape of a projection that protrudes radially outward from the outer peripheral surface of the inner cylinder member 20 . In the illustrated example, the display portion 29 has a substantially columnar shape when viewed in the projecting direction (radial direction).
The guide opening 39 of the inner cylinder receiving portion 37 has a slit shape extending in the circumferential direction through the inner cylinder receiving portion 37 in the radial direction (thickness direction). As shown in FIGS. 5(a) and 7(a), at one circumferential end of the guide opening 39, there is provided a support for preventing the display portion 29 from moving toward the first end in the axial direction with respect to the inner cylinder receiving portion 37. A second position holding portion 39a is provided. The second position holding portion 39a is formed to bend toward the second end in the axial direction so as to be located closer to the second end in the axial direction than the other circumferential portion of the guide opening 39 . Further, the second position holding portion 39a is provided with a restricting portion that restricts movement of the display portion 29 to the other side in the circumferential direction with respect to the guide opening 39. As shown in FIG.

The state in which the display portion 29 is positioned at the second position holding portion 39a of the guide opening 39 is defined as the second position where the protection member 10 is permitted to move toward the exposed position. In this state, the movement of the display portion 29 toward the axial direction first end side with respect to the inner cylinder receiving portion 37, that is, the movement to the extractable position is also suppressed. Further, in this state, the retaining member 5 is restricted by the inner peripheral surface of the inner cylinder receiving portion 37 and is restrained from moving radially outward. In this state, as shown in FIGS. 5(b), 6 and 7(b), the inclined guided surface 17 of the guided projecting piece portion 16 of the protective member 10 is aligned with the inclined guided surface of the outer cylindrical member 30. As shown in FIG. The deepest part 34a of 34 is faced, and the protection member 10 in the protection position can move toward the exposure position.

Further, if the display portion 29 is moved toward the other side in the circumferential direction relative to the inner cylinder receiving portion 37 so as to release the restriction by the restriction portion of the second position holding portion 39a, and is positioned at the bent portion. , the display portion 29 becomes movable relative to the inner cylinder receiving portion 37 toward the axial direction first end side. In this state, if the display portion 29, that is, the inner cylinder member 20 is moved relative to the inner cylinder receiving portion 37 toward the axial direction first end side, as shown in FIG. The concave stepped portion 38 of the inner cylinder receiving portion 37 is positioned radially outward of the retainer member 5 , so that the retainer member 5 can be moved radially outward. In other words, the pull-out position is reached, and in this state, the connected pipe 8 can be pulled out from the joint 1 as the stopper member 5 moves radially outward.

A portion of the guide opening 39 on the other side in the circumferential direction serves as a guide portion 39b extending in the circumferential direction. The display portion 29 moves relatively along this guide portion 39b, and as shown in FIG. to the exposed position side. In this state, as shown in FIG. 8B, the inclined guided surface 17 of the guided projecting piece portion 16 of the protective member 10 faces the boundary edge portion 34b of the inclined guide surface 34 of the outer cylindrical member 30. In this state, the protective member 10 cannot move toward the exposed position and is in the protective position. In addition, at the other end in the circumferential direction of the guide opening 39, there is provided a concave portion that enables reception of the display portion 29 when the inner cylinder member 20 is assembled to the outer cylinder member 30 (see FIG. 2). . It should be noted that the circumferential dimension of the guide opening 39 corresponds to the rotation of the outer cylinder member 30 that rotates relative to the inner cylinder member 20 when the protective member 10 is moved from the exposed position toward the protected position. An appropriate dimension may be set according to the angle (about 90 degrees in the example shown).
Further, in this embodiment, the guide opening 39 and the display portion 29 are provided at a plurality of locations (three locations in the example shown) at intervals in the circumferential direction. In addition, instead of such a mode, a configuration in which only one guide opening 39 and one display portion 29 are provided may be employed. The retaining member 5, the protective member 10, the inner cylindrical member 20, and the outer cylindrical member 30, which constitute the joint 1, may be made of a hard synthetic resin material, metal material, or the like.

In the joint 1 configured as described above, as shown in FIG. 5, the outer cylinder member 30 is positioned at the second position with respect to the inner cylinder member 20, and the protection member 10 is movable toward the exposed position and the protection position. In this state, the connected pipe 8 is inserted through the insertion port 21 . As shown in FIG. 6A, the end surface of the end portion 9 of the connected pipe 8 is pressed against the pressed portion 15 of the protective member 10, and the protective member 10 is axially moved with respect to the inner cylindrical member 20. Then, the engaging portion 13 of the protective member 10 contacts the engaged portion 28 of the inner cylindrical member 20 as described above. Then, as shown in FIG. 6(b), when the connected pipe 8 is further pushed in, the engaging portion 13 of the protective member 10 climbs over the engaged portion 28 of the inner cylindrical member 20, and a click feeling is imparted to the protective member. The member 10 is at the exposed position, the peripheral surface seal member 4 is exposed, and is brought into close contact with the outer peripheral surface 8a of the connected pipe 8. As shown in FIG. In this state, the inclined guided surface 17 of the guided projecting piece portion 16 of the protective member 10 comes into contact with or faces the deepest portion 34a of the inclined guide surface 34 of the outer cylindrical member 30. As shown in FIG.

When extracting the connected pipe 8 connected to the joint 1 as described above, as shown in FIG. , and the inner cylinder member 20 is moved relative to the outer cylinder member 30 so as to move toward the first end in the axial direction. In other words, it is set to the extractable position. As a result, as described above, the retaining member 5 can be moved radially outward, and the connected pipe 8 can be pulled out. In this state, the protective member 10 is in the exposed position (see FIG. 7(b)), so when connecting the connected pipe 8 after the connected pipe 8 is pulled out, the protective member 10 is placed in the protective position. is desired. That is, as shown in FIGS. 7(b) and 8(b), the inner cylinder member 20 (protection member 10) is rotated relative to the outer cylinder member 30 around the axis toward the first position side. . As a result, the guide action of the inclined guide surface 34 of the outer cylindrical member 30 causes the inclined guided surface 17 of the guided projecting piece portion 16 of the protective member 10 to move toward the first end in the axial direction, and the protective member 10 is protected. position, and the outer cylindrical member 30 is at the first position. In this state, the movement of the protective member 10 to the exposed position side is restrained by the boundary edge portion 34b of the inclined guide surface 34 of the outer cylinder member 30. As shown in FIG. Therefore, contrary to the above, the inner cylinder member 20 (protection member 10) is rotated relative to the outer cylinder member 30 around the axis toward the second position side, and moved to the second end side in the axial direction. to position the display portion 29 on the second position holding portion 39a. As a result, the protective member 10 from the protective position can be moved toward the exposed position, and the retainer member 5 cannot be moved radially outward.

In this embodiment, an example in which the display portion 29 for displaying the first position and the second position of the outer cylinder member 30 with respect to the inner cylinder member 20 is provided on the outer peripheral side of the joint 1 is shown. The configuration may be such that the portion 29 and the guide opening 39 for exposing the portion 29 are not provided. In this case, the inner cylinder member 20 and the outer cylinder member 30 are provided with a restricting guide or a guided portion for restricting the movement in the axial direction when the outer cylinder member 30 is rotated about the axis relative to the inner cylinder member 20 . It is good also as a structure provided in.
In this embodiment, the protective member 10 and the inner cylindrical member 20 are provided with the engaging portion 13 and the engaged portion 28 that constitute a click mechanism that gives a click feeling when the protective member 10 is in the exposed position. Although an example with such a click mechanism is shown, a configuration without such a click mechanism is also possible. In this case, a display window capable of informing that the protective member 10 has reached the exposed position (connection completion position) may be provided as an informing portion, or a mode may be employed in which a sound is produced to inform. Furthermore, the configuration may be such that the protection member 10 does not have a notification function for notifying that the protection member 10 has reached the exposed position (connection completion position).

Further, in this embodiment, an example is shown in which the protection member 10 is moved from the exposed position toward the protected position as the outer cylinder member 30 rotates in one direction relative to the inner cylinder member 20. However, it is not limited to such a mode. A configuration provided with an appropriate operating portion that can move the protective member 10 toward the protective position from the outer peripheral side of the joint 1, or a configuration in which the protective member 10 is detached from the inner cylinder member 20 to set the protective member 10 to the protective position may be configured to require assembly.
Further, in this embodiment, an example in which the protective member 10 is configured to be movable with respect to the inner cylinder member 20 from the exposed position toward the protective position is shown, but the protective member 10 may be non-movable. In other words, after the protective member 10 in the protective position is moved toward the exposed position, the protective member 10 may be rendered immovable toward the protective position.

Further, in this embodiment, an example in which the inner cylinder member 20 is provided with the groove 25 for receiving the peripheral seal member 4 is shown. A stepped wall or the like that prevents the member 4 from moving toward the second end in the axial direction may be provided. Further, in the present embodiment, an example in which the inner cylinder member 20 is provided with the recessed stepped portion 24 for receiving the cylindrical portion 11 of the protective member 10 is shown, but a configuration in which such a recessed stepped portion 24 is not provided is provided. good too.
Moreover, although this embodiment shows an example in which the outer cylinder member 30 that rotates about the axis relative to the inner cylinder member 20 is provided, the configuration is not limited to this. Only the inner cylinder member 20 may be used as the joint main body 2 without providing the outer cylinder member 30 . In this case, the shape of the inner tubular member 20 may be appropriately modified. For example, the inner cylinder member 20 may be provided with a portion that prevents the retaining member 5 from moving radially outward, or may be configured without the projection 22, the inter-cylinder sealing member 3, the groove 26, and the like. Further, a configuration may be adopted in which an appropriate tubular portion to which another tubular member is fixed is provided at the axial second end portion of the inner tubular member 20 . The above-described configuration of each member and each part of the joint 1 according to the present embodiment is merely an example, and various other modifications are possible.

1 joint 2 joint main body 4 peripheral seal member (seal member)
10 protective member 11 tubular portion 13 engaging portion (click mechanism)
15 Pushed portion 20 Inner cylindrical member (joint main body)
21 Receptacle 24 Recessed stepped portion (portion where the cylindrical portion moves in the axial direction)
25 concave groove 28 engaged portion (click mechanism)
8 connected pipe 8a outer peripheral surface 9 end

Claims (5)

A joint body provided with an insertion port into which the end of the connected pipe is inserted on the first end side in the axial direction, a seal member provided on the inner peripheral side of the joint body, and a protective position covering the seal member a protection member that is axially movable with respect to the joint body toward an exposed position where the seal member is exposed and can be brought into close contact with the outer peripheral surface of the connected pipe;
The protective member includes a pressed portion that is provided on the second end side in the axial direction and is pressed toward the exposed position by the end portion of the connected pipe, and a first end side in the axial direction of the pressed portion. a cylindrical portion covering the sealing member, the inner diameter of the cylindrical portion being larger than the outer diameter of the connected pipe, and the axial direction including the portion of the cylindrical portion covering the sealing member. The outer diameter of the one end side portion is smaller than the inner diameter of the portion of the joint body where the cylindrical portion moves in the axial direction.cage,
A recessed stepped portion is provided on the axially second end side of the joint body so as to have a larger inner diameter than that on the axially first end side, and receives the tubular portion. A recessed groove for receiving the seal member is provided along the entire circumference so as to open toward the axial center side of the step bottom facing the axial center side of the stepped portion. A fitting characterized by: In claim 1,
A joint characterized in that the inner diameter of the tubular portion is the same throughout substantially the entire axial direction. In claim 1 or 2 ,
A joint according to claim 1, wherein an outer diameter of a first axial end portion of the cylindrical portion including a portion covering the sealing member is uniform over substantially the entire axial direction. In any one of claims 1 to 3 ,
A joint, wherein the protection member is axially movable with respect to the joint body from the exposed position toward the protected position. In any one of claims 1 to 4 ,
A joint, wherein the joint body and the protection member are provided with a click mechanism that gives a click feeling when the protection member is in the exposed position.

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