JP2001165374A - Corrugated tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated tube joint which is simply constructed and can be connected easily. SOLUTION: A ring groove 12 is dug in an inner hole portion B of a joint body 10 in a radially outer direction. On the other hand, a ring groove 23 is dug on the outer periphery of a retainer case 18 in a radially inner direction. An inner periphery portion of a stop ring 24 is fitted in the ring 23. Firstly, a retainer 17 is inserted into a corrugated tube T, then the retainer 17 is mounted on the retainer case 18. Further, when the corrugated tube T and the like are inserted into the joint body 10, the outer periphery of the stop ring 24 is fitted into the ring groove 12, prohibiting the retainer case 18 from being disassembled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated pipe joint used for connecting a bellows-shaped corrugated pipe to, for example, a steel pipe. In particular, the present invention relates to a corrugated pipe joint that can easily and quickly perform a connection operation with a simple structure.

[0002]

2. Description of the Related Art FIG. 13 is a diagram schematically showing an example of a gas pipe of a building. In this piping example, the gas meter 81
Is located outside the building. In the gas meter 81,
A city gas supply pipe 80 and an indoor gas pipe (plated steel pipe) 82 are connected. The steel pipe 82 is connected to a corrugated pipe T going to a gas outlet 86 in each room. A gas device 89 such as a gas stove is connected to the end of the gas outlet 86 via a rubber tube 87 or the like.
A female thread is cut at a connecting portion (chi) 82a between the steel pipe 82 and the corrugated pipe T. Steel pipe 82 or corrugated pipe T
Is installed in the wall of the building or under the floor.

The corrugated tube T is a flexible tube having a bellows-like annular unevenness formed on the outer surface. The corrugated pipe T is connected to the Qi 82a. A corrugated pipe joint 88 is used to connect the corrugated pipe T to the Qi 82a.

A conventional example of this type of corrugated pipe joint 88 is disclosed in, for example, Japanese Patent No. 2686237. FIG. 10 is a cross-sectional view showing a temporary insertion state of the corrugated pipe of the joint. FIG. 11 is a cross-sectional view showing the joint after it has been fastened (corrugated pipe connected state). FIG. 12 is a perspective view of the retainer and a diagram for explaining the operation of the tip of the corrugated tube going over the claw of the retainer. In the following description, up, down, left, and right refer to up, down, left, and right in FIGS.

[0005] The corrugated pipe joint 88 is mainly composed of a joint body 51, a retainer 54 arranged in the joint body 51, and a nut 6 screwed on the upper part of the joint body 51.
2. The joint main body 51 is a cylindrical body made of stainless steel. A male screw 51a is formed on the lower outer peripheral surface of the main body 51. The male screw 51a is screwed into the female screw of the Qi 82a in FIG.

The joint body 51 has a through hole extending in the axial direction. A female screw 52a is formed on the upper inner surface of the through hole. This female screw 52a is a male screw 6 of a nut 62.
2a. A concave groove 52b is formed below the female screw 52a. The concave groove 52b has a larger diameter than the female screw 52a. A tapered portion 52c is formed below the concave groove 52b. The tapered portion 52c is tapered downward. A packing groove 52d is formed below the tapered portion 52c, and the first packing 68 is fitted therein. A step 52e is formed below the packing groove 52d, and the second packing 53 is fitted therein. The inner diameter of the step portion 52e is smaller than the diameter of the concave portion of the corrugated pipe T.

[0007] The retainer 54 is a sleeve-like member disposed in the inner hole of the joint body 51. The outer diameter of the retainer 54 is smaller than the concave groove 52b of the joint main body 51 and slightly smaller than the tapered portion 52c.

[0008] As shown in FIG.
Is formed with a slit 54a extending from the end in the axial direction. The plurality of slits 54a are formed at regular intervals in the circumferential direction of the retainer. A segment 55 is formed between two adjacent slits 54a. At the end of each segment 55, a claw 5 projecting radially inward is provided.
5a are formed. The circle formed by each claw 55a is smaller than the diameter of the convex portion of the corrugated tube T, and is substantially equal to the diameter of the concave portion. A plurality of protrusions 56 are formed on the outer peripheral surface of the other end of the retainer 54 (the opposite side of the segment 55). As shown in FIG. 10 and FIG.
2 engages the inner surface. The base of the retainer 54 is made of plastic, the claws 55a and the like are made of brass, and both are integrally molded.

A description will be given with reference to FIGS. 10 and 11 again. The nut 62 is a cylindrical body made of stainless steel. The nut 62 has a through hole through which the corrugated pipe T passes. A male screw 62 a that is screwed to the female screw 51 a of the joint main body 51 is formed on a lower outer peripheral surface of the nut 62. A projection 63 is formed on the inner surface of the lower end of the nut 62 and protrudes inward in the radial direction. The protrusion 63 is hooked on the protrusion 56 of the retainer 54. When the retainer 54 is pushed into the nut 62 from below and the projections 56 and 63 are hooked, the retainer 54 and the nut 62 are connected. Nut 6
A packing 57 is fitted on the inner surface of the upper part of 2.
In a temporarily tightened state of the nut 62 shown in FIG. 10 (a state in which the collar 65 is interposed between the nut 62 and the joint body 51), the claw 55a at the lower end of the retainer 54 is located on the inner peripheral portion of the concave groove 52b.

Next, a method of using the above-mentioned corrugated pipe joint 88 will be described. First, as shown in FIG. 10, the retainer 54 is arranged in the joint main body 51, and the male screw 62 a of the nut 62 is temporarily fastened to the female screw 52 a of the joint main body 51. FIG. 10 shows a state in which the corrugated pipe T has already been inserted into the nut 62, but the following description is about the operation when the corrugated pipe T is inserted.

Next, when the lower end of the corrugated pipe T is inserted from above into the through holes of the nut 62 and the joint body 51, the tip of the corrugated pipe T hits the claw 55 a of the retainer 54.
Further, when the corrugated pipe T is pushed in, the corrugated pipe T
Pushes the claw 55a of the retainer 54 outward and downward. Therefore, as shown in FIG. 12B, the segments 55 are each deformed and expanded in the radial direction with the cut end of the slit 54a of the retainer 54 as a fulcrum. The spreading deformation of the segment 55 is caused by the concave groove 52 b of the joint body 51.
(See FIG. 11). Further, when the claw 55a of the retainer 54 gets over the convex portion of the corrugated tube T, the claw 55a engages with the concave portion of the corrugated tube T as shown in FIG.

Thereafter, the nut 62 is turned using a tool such as a spanner or a wrench, and tightened into the joint body 51. Nut 6
With the tightening of 2, the retainer 54 is pushed downward and advances. At this time, since the claw 55a of the retainer 54 is engaged with the concave portion of the corrugated pipe T, when the retainer 54 advances, the corrugated pipe T is also pulled down at the same time. When the retainer 54 advances, the outer periphery of the retainer 54 is pressed by the tapered surface of the tapered portion 52c of the joint body 51 and pressed inward. Thereby, the claw 55a of the retainer 54 tightens the concave portion of the corrugated pipe T in the radial direction. Finally, as shown in FIG. 11, the end of the corrugated pipe T is pressed against the second packing 53. With this, corrugated pipe T
And the joint body 51 are sealed. When the nut 62 is tightened, the tip of the corrugated pipe T is crushed.

[0013]

In the conventional corrugated pipe joint 88, a tool such as a spanner or a wrench is required when the nut 62 is turned in the connection operation. However, as described above, the steel pipe 82 is often installed under the floor or in a wall, and it is difficult to turn a wrench or wrench in a narrow place or the like. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a corrugated pipe joint that can easily and quickly perform a connection operation with a simple structure.

[0014]

Means for Solving the Problems To solve the above problems, a corrugated pipe joint according to a first aspect of the present invention is a corrugated pipe joint in which bellows-shaped annular irregularities are formed on an outer surface; An inner hole through which the portion penetrates, and a retainer having a claw inserted into the annular concave portion of the outer surface of the corrugated pipe provided in the inner hole, and a connection portion with another pipe,
And a joint body having an inner hole into which the retainer and the end of the corrugated pipe are inserted, and a corrugated pipe and a corrugated pipe in which the retainer and the corrugated pipe end are inserted into the joint body inner hole after the corrugated pipe is inserted into the retainer. Fixing means for fixing the retainer to the joint body; sealing means for sealing between the corrugated pipe and the joint body;
It is characterized by having.

The corrugated tube and the retainer can be fixed to the joint body only by inserting the retainer into which the corrugated tube has been inserted into the inner hole of the joint body. Therefore, it is not necessary to use a tool such as a spanner or a wrench. Even so, the connection operation can be easily and quickly performed.

In the corrugated pipe joint according to the first aspect of the present invention, as the fixing means, a stop ring having a cut in one place on a circumference and an inner peripheral portion of the stop ring formed on the outer periphery of the retainer are provided. A structure having an engaging ring groove and a ring groove formed in the joint body inner hole and engaging with the outer periphery of the stop ring can be adopted. In this case, when the retainer is inserted into the joint body inner hole, the outer peripheral portion of the stop ring whose inner peripheral portion is engaged with the ring groove of the retainer engages with the ring groove of the joint body. The engagement of the stop ring fixes the retainer and the joint body, and as a result, fixes the corrugated pipe to the joint body. The user can be informed that the retainer is fixed to the joint body by the sound emitted when the outer peripheral portion of the stop ring is engaged, or by eliminating the gap between the retainer and the joint body on the appearance. it can.

The corrugated pipe joint according to the first aspect of the present invention preferably has a mechanism for releasing the fixing of the fixing means. In this case, the retainer fixed to the joint body can be removed from the body, and the corrugated pipe joint has reworkability. If a stop ring is used as a mechanism to release the fixing of the fixing means, the joint body should be divided by a ring groove, and the retainer should be removed from the joint body by dividing the body and removing the stop ring. Can be.

Further, in the corrugated pipe joint according to the first aspect of the present invention, when assembling the corrugated pipe through the inner hole of the retainer, the tip of the corrugated pipe is protruded from the retainer by a predetermined length. Is preferably provided. In this case, since the length of the corrugated pipe tip protruding from the retainer is predetermined, the tip of the corrugated pipe does not collapse when the retainer and the corrugated pipe are fixed, and a large force is not required for the connection work.

The corrugated pipe joint according to the second aspect of the present invention comprises:
A joint for a corrugated pipe in which bellows-shaped annular irregularities are formed on an outer surface; a joint body having a connection portion with another pipe and an inner hole into which an end of the corrugated pipe is inserted; And a retainer having a claw inserted into the annular recess of the same surface, and after attaching the retainer to the corrugated pipe, the corrugated pipe and the retainer are inserted into the joint body inner hole with the retainer and the corrugated pipe end inserted into the joint body inner hole. A sealing means for sealing between the corrugated pipe and the joint body; and an annular packing pressed against the outer peripheral surface of the corrugated pipe tip as said sealing means. And a spring member that urges the inner peripheral portion of the member toward the inside. Here, the spring member refers to a member having a continuous elasticity (non-sagging) for urging. The spring member is not limited to a metal member, but may be a hard plastic or a carbon material. The connection work can be performed easily and quickly similarly to the corrugated pipe joint of the first aspect of the present invention, and even if there is a burr or the like at the end of the corrugated pipe, the connection between the corrugated pipe and the joint body is not affected. Airtightness can be ensured.

The corrugated pipe joint according to the second aspect of the present invention comprises:
It is preferable that the spring member is a metal plate having a U-shaped cross section embedded in the packing. For example, if a packing containing a resin as a main component is used for a long period of time with a fixed shape, the elasticity may be weakened, and the airtightness between the corrugated pipe and the joint body may be reduced. However, since the metal plate reinforces the elasticity of the packing, a sufficient binding force can be maintained between the corrugated pipe and the packing, and airtightness can be ensured for a long time.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described with reference to FIGS. In the description of the embodiment, up, down, left, and right refer to up, down, left, and right in those figures. 1 to 3 are process diagrams for explaining a connection operation using a corrugated pipe joint according to a first embodiment of the present invention. FIG. 1 shows an initial process, FIG. 2 shows a middle process, and FIG. Show. FIG. 4 is a cross-sectional view showing a configuration of a retainer and a retainer case of the corrugated pipe joint according to the first embodiment. FIG. 5 is a cross-sectional view showing the configuration of the joint body of the corrugated pipe joint of the first embodiment. FIG. 6A is a sectional view (left half) and a side view (right half) of the retainer of FIG.
(B) is a bottom view of the retainer of FIG. 4.

The joint body 10 shown in FIG. 5 is a tubular body made of brass or the like. A male screw 10a is formed on the lower outer peripheral surface of the joint body 10. This male screw 10a is shown in FIG.
And screwed into the female screw of No. 3 Qi 82a. The joint body 10 has a through hole 11 extending in the axial direction. The through-hole 11 is a stepped cylindrical hole, and is roughly divided into inner holes A to D 11a to 11d in order from the upper side in the axial direction. Inner hole A part 11a
Is a cylindrical surface 11a 'opened on the upper end side of the joint body 10.
The inner bore B portion 11b is a cylindrical surface formed to have the same diameter as the minimum inner diameter portion of the conical surface 11a ″. is there. The inner hole C portion 11c is a stepped portion formed with a smaller diameter than the inner hole B portion 11b. The inner hole D portion 11d opens at the lower end side of the joint body 10 and the inner hole C portion 11c.
And a cylindrical surface formed with a smaller diameter than the B portion 11b.

A ring groove 12 is dug radially outward in the inner peripheral surface on the upper end side of the inner hole B portion 11b of the joint body 10. At the end of the corrugated pipe connection, an outer peripheral portion of a stop ring 24 described later is fitted into the ring groove 12. A seal groove 13 is dug outward in the radial direction on the inner peripheral surface on the lower end side of the inner hole B portion 11b. The seal groove 13 is provided with the corrugated pipe T and the joint body 10.
A seal member 14 for hermetically sealing (sealing) the space is fitted.

The seal member 14 comprises a stainless steel ring 14a (spring member) having a U-shaped cross section and a packing 14b (for example, made of resin) into which the ring 14a is inserted. The packing 14b covers the ring 14a. The outer peripheral portion of the packing 14b is pressed against the inner hole of the joint body 10, and the inner peripheral portion is pressed against the outer peripheral surface of the corrugated pipe when the corrugated pipe is connected. Stainless steel ring 14a
Urges the inner peripheral portion of the packing 14b toward the inside. At this time, the outer peripheral portion of the packing 14b is simultaneously moved outward. The elasticity of the packing 14b is reinforced by the stainless steel ring 14a, and the sealing property between the corrugated pipe T and the joint body 10 is maintained for a long time. Also, even if there is some burr or the like at the tip of the corrugated tube T, the sealing performance is not impaired. The joint body 10 may be divided at a position below the seal groove 13, and the seal member 14 may be fitted into the seal groove 13 from below. With this divided structure, the sealing member 14
Can be assembled without forcibly deforming the seal member 14 at the time of assembling, so that the seal member 14 can be easily assembled. In addition, the setting of the hardness of the seal member 14 becomes easy.

A packing groove 15 is smoothly dug radially outward in the inner hole C portion 11c of the joint body 10. A ring-shaped carbon packing 16 is fitted into the packing groove 15. This carbon packing 16
The main material is a carbon material that expands when the temperature rises, and becomes a gas seal that expands many times in the event of a fire and prevents gas from leaking outside the joint.

Next, the retainer 17 and the retainer case 18 for fixing the corrugated pipe T will be described.
In addition, in the claims and means for solving the problems in the present specification, a retainer and a retainer case are referred to as a retainer. As shown in FIG. 6A, the retainer 17
Is shaped like a sleeve, and has a slit 17a extending in the axial direction from the lower end. Slit 17a
As shown in FIG. 6B, a plurality of (5 in this embodiment) are formed at equal intervals in the circumferential direction. A segment 17b is formed between two adjacent slits 17a. At the lower end of each segment 17a, a claw 17c projecting inward in the radial direction is formed. Each nail 17c
The circle formed by the tip is smaller than the diameter of the annular projection T1 of the corrugated pipe T, and is substantially equal to the diameter of the annular recess T2 of the pipe T. On an outer peripheral surface on an upper end side (opposite side of the segment 17b) of the retainer 17, a plurality of projections 17d projecting outward in the radial direction are formed at equal intervals in the circumferential direction. These projections 17d are, as shown in FIG.
8 engages the inner surface. The base of the retainer 17 is made of plastic, the claws 17c and the like are made of brass, and both are integrally molded.

As shown in FIG. 4, the outer peripheral surface of the retainer case 18 is roughly divided into an upper outer peripheral surface 18a, a middle outer peripheral surface 18b, and a lower outer peripheral surface 18c in order from the upper side in the axial direction. Upper outer peripheral surface 18
In a, a hole 19 penetrating in the radial direction is formed.
The hole 19 serves as a gas leak detection port. A porous resin 20 having air permeability and water tightness is fitted in the hole 19. A ring groove 21 is dug toward the inside in the radial direction on the middle and outer peripheral surfaces 18 b of the retainer case 18, and an O-ring 22 is fitted into the groove 21. When the connection of the corrugated pipe is completed, the space between the joint body 10 and the retainer case 18 is sealed by the O-ring 22. A ring groove 23 is dug into the lower outer peripheral surface 18c of the retainer case 18 inward in the radial direction,
The inner peripheral portion of the stop ring 24 is fitted in the groove 23. A cut (not shown) is formed at one position on the circumference of the stop ring 24, and the cut is widened and incorporated into the ring groove 23. At the end of the corrugated pipe connection, the outer peripheral portion of the stop ring 24 is further fitted into the ring groove 12 of the joint body 10, so that the joint body 10 and the retainer case 18 are connected.

A through-hole 25 into which the corrugated pipe T is inserted is formed in the retainer case 18 so as to extend in the axial direction. A packing groove 26 is dug in the inner peripheral surface on the upper end side of the through hole 25 toward the outside in the radial direction.
A ring-shaped packing 27 is fitted in the groove 26. A groove 27a is dug in the inner surface of the packing 27 radially outward except for the upper and lower ends. At the center of the groove 27a, a protrusion 27b projecting inward in the radial direction is formed. The packing 27 and the O-ring 22 provide a watertight seal between the corrugated pipe T and the joint body 10.

The lower inner peripheral surface of the through hole 25 of the retainer case 18 has a hook groove 28 having a circumferential shape extending radially outward.
Has been dug. The retainer 17 is inserted into the hook groove 28.
The retainer 17 is mounted on the retainer case 18 by engaging the respective projections 17d. Prior to the start of corrugated pipe connection (usually at the factory shipment stage), the retainer 17 is attached to the retainer case 18 in advance. In addition, retainer 1
7 and the outer peripheral surface 18b of the retainer case 18 have a diameter that just fits into the inner hole B portion 11b of the joint body 10.

Next, a connection operation using the corrugated pipe joint of the present embodiment will be described with reference to FIGS. FIG.
As shown in (A), a cylindrical cap 29 having one end opened and the other end closed is attached to the retainer case 19 of the corrugated pipe joint. The inner diameter of the cap 29 is
The inner and outer peripheral surfaces 18b of the retainer case 18 are formed to have dimensions that can just fit. When the cap 29 is put on the retainer case 18 on which the retainer 17 is mounted, the opening end face of the cap 29 is
Contact x. At this time, a predetermined gap L is opened between the lower end of the retainer 17 (segment 17b side) and the bottom surface 29a of the cap 29. This interval L defines the length of the end of the corrugated pipe T protruding from the retainer 17 in the step shown in FIG. As a result, a situation in which the distal end of the corrugated pipe T is crushed at the time of connection does not occur, so that a large force is not required for the connection work. In this embodiment, the interval L is set to a length corresponding to three protrusions T1 of the corrugated tube T. When the cap 29 is put on the retainer case 18, the O-ring 22 is pressed against the inner peripheral surface of the cap 29, so that the cap 29 does not easily fall off.

Before a series of connection work, the cap 29
Is covered on the outer surfaces of the retainer 17 and the retainer case 18. Therefore, the covering T3 is removed by a predetermined length (in this embodiment, the portion from the flexible end face to the ninth recess T2) and the exposed end of the corrugated pipe T is inserted into the retainer case 18 (FIG. 1 (A) → ( B)). With this insertion, the packing 27 is pressed against the coating T3 of the corrugated pipe T, and the corrugated pipe T and the inside of the joint body 10 are sealed watertight. When the tip of the corrugated pipe T comes into contact with each of the claws 17c of the retainer 17, these claws 17c are opened outward and get over the projection T1 of the corrugated pipe T. When the corrugated pipe T is further advanced, the lower end of the corrugated pipe T becomes the bottom surface 2 of the cap 29.
Hits 9a. At this time, from the lower end of the corrugated pipe T, 3
One of the protrusions T1 protrudes from the retainer 17, and the retainer claws 17c are respectively inserted into the recesses T2 of the corrugated pipe T. Thereafter, the cap 29 is attached to the retainer case 1.
8 (Figure above (C) in FIG. 2).

Next, the retainer 1 sandwiching the corrugated pipe T
7 and the retainer case 18 are inserted into the joint body 10 from the upper end side (FIG. 2C → FIG. 3D). During this insertion, the outer peripheral portion of the stop ring 24 is contracted inward while sliding along the inner hole A portion 11a of the joint body 10.

Further, with the insertion of the corrugated pipe, the distal end of the corrugated pipe T advances to the inside of the through hole 11 of the joint body 10 while deforming the inner peripheral surface of the seal member 14 in the joint body 10. At this time, the inner peripheral portion of the packing 14b is pressed by the urging force of the stainless steel ring 14a of the seal member 14 while following the outer surface of the distal end portion of the corrugated pipe T. Therefore, the space between the corrugated pipe T and the joint body 10 is sealed.

In the state of FIG. 3E in which the corrugated pipe T is completely inserted, the end of the corrugated pipe T abuts against the inner step of the joint body 10 and stops. At this time, when the stop ring 24 reaches the ring groove 12 of the joint body 10,
It cannot be pressed inward in the radial direction and spreads outward. Then, the outer peripheral portion of the stop ring 24 enters the ring groove 12 of the joint body 10. Then, stop ring 24
Engages with both the joint body 10 and the retainer case 18, the joint body 10 and the retainer case 18 are connected, and a series of connection operations is completed (FIG. 3E). In this state, since the outer peripheral portion of the retainer 17 is fitted and held in the inner hole of the joint body 10, the claw 17c of the retainer 17 does not open, and the corrugated pipe T is connected to the corrugated pipe joint. Firmly fixed.

As described above, if the corrugated pipe joint of this embodiment is used, the connecting operation can be easily and quickly performed even in a narrow place without using a tool such as a spanner or a wrench. In this embodiment, the stop ring 2
The end of a series of connection work is known by the sound produced when the outer peripheral portion of the joint body 4 is fitted into the ring groove 12 of the joint body 10 and the upper end surface of the joint body 10 abutting against the outer step of the retainer case 18. be able to.

Next, the second embodiment of the present invention will be described with reference to FIGS.
An embodiment will be described. In the description of the embodiment, up, down, left, and right refer to up, down, left, and right in each figure. FIG.
FIG. 4 is a sectional view showing a connection state of a corrugated pipe joint according to a second embodiment of the present invention. 8 and 9 are process diagrams for explaining the operation of extracting a corrugated pipe from a corrugated pipe joint according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals. The feature of the corrugated pipe joint of this embodiment is that, as best shown in FIG.
2 and a screw bush 33. The screw bush 33 includes a flange portion 33b serving as an upper end portion of the joint body 30, and a male screw 33a. Flange part 33
b, an O-ring 31
Is fitted. A male screw 33a is formed in a middle portion of the cylindrical portion 33c.

On the other hand, on the inner surface of the upper end portion of the main body 32, a female screw 32b to be screwed with the external thread 33a of the screw bush 33 is formed. When the main body 32 and the screw bush 33 are assembled by screwing both screws, the lower end surface 33 of the screw bush 33
d and the step 32c (under the female screw 32b) of the main body 32 form the ring groove 12 (see FIG. 7). The O-ring 31 seals the space between the main body 32 and the screw bush 33.

As described above, after the corrugated pipe is connected, the ring groove 12 is secured between the main body 32 of the joint body 30 and the screw bush 33. The outer periphery of the stop ring 24 is fitted into the groove 12, and the inner periphery of the stop ring 24 is
9, the retainer case 18 and the joint body 30 cannot be separated from each other.

Hereinafter, the operation of extracting the corrugated pipe from the corrugated pipe joint of the present embodiment will be described. First, the main body 32 of the joint body 30 and the screw bush 33 are separated by rotating in the loosening direction of the screw. After this separation,
The stop ring 24 is the ring groove 2 of the retainer case 19.
3 is engaged. And stop ring 24
Is in contact with the lower end surface of the screw bush 33 to prevent the screw bush 33 from coming off the retainer case 18. However, after being separated from the screw bush 33, the main body 32 is not restrained by the stop ring 24, and as shown in FIG.
7. The retainer case 18 and the screw bush 33 are integrally removed from the main body 32.

Next, the cut (not shown) of the stop ring 24 is widened, and the stop ring 24 is removed from the ring groove 23 of the retainer case 18. Then, the screw bush 33 is removed from the retainer case 18. Further, the claws 17c of the retainer 17 are opened, and the corrugated pipe T is pulled out. At this time, since the outer peripheral portion of the claw 17c of the retainer 17 has nothing to press, the claw 17c can be opened. Thereby, the corrugated pipe T can be removed from the joint body 30. FIG. 9 shows a state where the corrugated pipe joint is disassembled. After that, if the main body 32 of the joint body 30 and the screw bush 33 are assembled, they can be used for the next connection operation. With the corrugated pipe joint of the present embodiment, the same effects (easy connection possible) as those of the first embodiment can be obtained by the above-described configuration and operation procedure, and also re-installability can be obtained.

[0041]

As described above, according to the corrugated pipe joint of the first aspect of the present invention, there is no need to use a tool such as a spanner or a wrench, and the connection operation can be easily and quickly performed even in a narrow place. It can be carried out. In addition, in the first aspect of the present invention, when a mechanism for releasing the fixing of the fixing means is provided, the retainer fixed to the joint body can be removed, and reworkability can be realized. Further, in the first aspect of the present invention, when the corrugated pipe is inserted into the retainer inner hole and assembled, when a member that defines the length of the corrugated pipe tip protruding from the retainer is attached, the connection is made at the time of connection. The tip of the corrugated pipe does not collapse, and a large force is not required for the connection work.

On the other hand, according to the corrugated pipe joint of the second aspect of the present invention, even if there is a burr or the like at the end of the corrugated pipe, the airtightness between the corrugated pipe and the joint body can be secured without being significantly affected. . In particular, the cross section U
In the case of embedding a U-shaped metal plate to constitute a spring member,
The airtightness between the corrugated pipe and the joint body can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a process diagram for describing an initial process of a connection operation using a corrugated pipe joint according to a first embodiment of the present invention.

FIG. 2 is a process diagram for explaining a middle stage process of the connection operation following FIG. 1;

FIG. 3 is a process chart for explaining a final step of the connection operation following FIG. 2;

FIG. 4 is a cross-sectional view showing a configuration of a retainer and a retainer case of the corrugated pipe joint according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration of a joint body of the corrugated pipe joint according to the first embodiment of the present invention.

FIG. 6A is a cross-sectional view (left half) of the retainer of FIG. 4;
FIG. 5B is a bottom view of the retainer of FIG. 4.

FIG. 7 is a sectional view showing a structure of a corrugated pipe joint according to a second embodiment of the present invention. In this figure, the corrugated pipe is connected.

FIG. 8 is a process chart for explaining a middle stage process of the sampling operation following FIG. 7;

FIG. 9 is a process chart for explaining a final step of the sampling operation following FIG. 8;

FIG. 10 is a cross-sectional view showing a state where a corrugated pipe is temporarily inserted into a conventional joint.

FIG. 11 is a cross-sectional view showing a state after a conventional joint is fastened (corrugated pipe connected state).

FIG. 12 is a view showing details of a retainer of a conventional joint. (A) is a perspective view of the retainer, (B) is a diagram illustrating the expansion and deformation of the retainer when the corrugated tube is inserted, and (C) is a diagram illustrating a state where the concave portion of the corrugated tube and the retainer are engaged. FIG.

FIG. 13 is a diagram schematically illustrating an example of a gas pipe.

[Explanation of symbols]

10, 30 Joint body 11, 25 Through hole 12, 21, 23 Ring groove 13 Seal groove 14 Seal member 15, 26 Packing groove 16 Carbon packing 17 Retainer 18 Retainer case 19 Hole 20 Porous resin 22, 31 O-ring 24 Stop ring 27 Packing 28 Hook groove 29 Cap 32 Main body 33 Screw bush 14a Stainless steel ring 14b Packing 17a Slit 17b Segment 17c Claw 17d Projection T Corrugated tube T1 Annular projection T2 Annular recess T3 Coating

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Atsushi Okubo 25-3, Morinodai, Midori-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Minoru Fujiyoshi 2nd Daifuku, Kuwana-shi, Mie Hitachi Metals, Ltd. Person Yasushi Fujinawa 13-14-102 Arai-cho, Kawaguchi-shi, Saitama F-term (reference) 3H017 CA03 CA05

Claims (9)

[Claims] 1. A corrugated pipe joint having a bellows-shaped annular unevenness formed on an outer surface thereof, the inner hole penetrating an end of the corrugated pipe, and the annular recess formed on the outer surface of the corrugated pipe provided in the inner hole. A retainer having a claw inserted into the retainer, a connection portion with another pipe, and a joint body having an inner hole into which the end of the retainer and the corrugated pipe are inserted; and a retainer and a corrugate after the corrugated pipe is inserted into the retainer. Fixing means for fixing the corrugated pipe and the retainer to the joint body with the pipe end inserted into the joint body inner hole; and sealing means for sealing between the corrugated pipe and the joint body. A characteristic corrugated pipe joint. 2. As the fixing means, a stop ring having a cut at one place on a circumference, a ring groove formed on an outer periphery of the retainer and engaging with an inner peripheral portion of the stop ring, 2. The corrugated pipe joint according to claim 1, further comprising: a ring groove formed in the hole and engaging with the outer periphery of the stop ring. 3. The retainer is divided into a plurality of segments having elasticity by a plurality of slits extending in an axial direction from an end, and the retainer claw is provided at an end of each segment on a radially inner side of the retainer. When the corrugated pipe is inserted into the retainer inner hole, each retainer claw opens and gets over the annular convex part of the corrugated pipe, and then fits into the annular concave part of the pipe, and as the fixing means, 2. The structure according to claim 1, wherein, after the end of the corrugated pipe is inserted into the inner hole of the joint body, each retainer claw is not opened by pressing the outer peripheral surface of each segment with the inner wall of the body. Or the corrugated pipe joint according to 2. 4. The corrugated pipe joint according to claim 1, further comprising a mechanism for releasing the fixing of said fixing means. 5. The corrugated pipe joint according to claim 2, wherein the joint body is divided by a ring groove, and the fixing body can be released by removing the stop ring by dividing the body. 6. When the corrugated pipe is passed through an inner hole of a retainer and assembled, a tip for projecting a predetermined length of the corrugated pipe from the retainer is provided, and a member for defining a length of the protruding part is provided. The corrugated pipe joint according to claim 1, wherein 7. A joint for a corrugated pipe in which bellows-shaped annular irregularities are formed on an outer surface; a joint body having a connection portion with another pipe and an inner hole into which an end of the corrugated pipe is inserted; A retainer having a claw that is attached to the outer surface of the corrugated pipe and inserted into the annular recess of the same face; and, after the retainer is attached to the corrugated pipe, the retainer and the corrugated pipe end are inserted into the joint body inner hole, and the corrugated pipe and A fixing means for fixing the retainer to the joint body; and a sealing means for sealing between the corrugated pipe and the joint body. A corrugated pipe joint comprising: a packing; and a spring member for biasing an inner peripheral portion of the packing toward the inside. 8. The corrugated pipe joint according to claim 7, wherein the spring member is a metal plate having a U-shaped cross section embedded in the packing. 9. A corrugated pipe joint having a bellows-shaped annular unevenness formed on an outer surface thereof; an inner hole penetrating an end of the corrugated pipe; and an annular recess formed on the outer surface of the corrugated pipe provided in the inner hole. A retainer having a claw inserted into the retainer, a connection portion with another pipe, and a joint body having an inner hole into which the end of the retainer and the corrugated pipe are inserted; and a retainer and a corrugate after the corrugated pipe is inserted into the retainer. A fixing means for fixing the corrugated pipe and the retainer to the joint body with the pipe end inserted into the joint body inner hole; and a sealing means for sealing between the corrugated pipe and the joint body. A corrugated pipe joint which informs a user of completion of fixing of a fixing means by a sound or a characteristic of a joint appearance.