JP2000088163A - Pipe body connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable connection by one common pipe body even in the case of a screw connection system wherein one pipe body side connected to the other pipe body has a screw part and also even in the case of an insertion connection system wherein one pipe body side has an insertion part and after the insertion shaft part is inserted in the other pipe body, they are interconnected with a clamp member. SOLUTION: One pipe body 10 is provided with a female screw part 24 and an engaging surface 26 continued thereto and an O-ring 34 is mounted on a fit-in surface 26. In the case that the other pipe body 12 is of an insertion connection system, the insertion shaft part 30 of the other pipe body 12 is inserted in one pipe body 10 and engaged in a watertight state with the fit-in surface 26 through the O-ring 34. Thereafter, the flange parts 22 and 28 of a pair of the pipe bodies 10 and 12 are clamped by an elastic clip 36 and the pipe bodies 10 and 12 are interconnected. Further, in the case of a connection system wherein the other pipe body 12 has a male screw part 50, the male screw part 50 is screwed in the female screw part 24 of one pipe body 10 and a pair of the pipe bodies 10 and 12 are interconnected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe connecting structure for connecting a pair of pipes.

[0002]

2. Description of the Related Art For example, a connection structure as shown in FIG. 7 has been generally adopted as a connection structure for connecting a faucet fitting and a pipe. In the figure, reference numeral 200 denotes a pipe on the pipe side, which has a female screw part 202 (FIG. 7A) on the inner peripheral side of the tip or a male screw part 204 (FIG. 7B) on the outer peripheral side.

Reference numeral 206 denotes a faucet-side tube, which is provided with a male nut 208 (FIG. 7A) on the outer peripheral side of the tip or a cap nut 212 (FIG. 7B) having a female thread 210 on the inner peripheral side. Each has.

In the case of this conventional connection structure, as shown in FIG. 1A, a connection is made by screwing a male thread 208 of a tube 206 into a female thread 202 of a tube 200, or as shown in FIG. As shown in FIG.
No. 2 male screw part 204, cap nut 2 of tube 206
12 are screwed together to form a pair of pipes 200, 206.
Make the connection.

The sealing between the pair of tubes 200 and 206 is performed by winding a sealing tape around the male screw portion 208 shown in FIG. 1A and screwing it together, or as shown in FIG. This is performed by sandwiching the packing 214 between the pair of pipes 200 and 206 as shown in FIG.

However, in the case of the connection structure shown in FIG. 7, it is necessary to rotate the seal tape or use a tool to rotate the screw part many times in order to screw the screw part together. There is a problem that a variation in construction occurs due to the degree of winding of the sealing tape and the degree of turning of the screw.

On the other hand, a connection structure as shown in FIG. 8 has recently been used. In this connection structure, a pair of pipes can be connected with one touch by using a clamp member. More specifically, in the figure, reference numeral 216 denotes a hollow insertion shaft having a circular cross section provided on the tube 206 so as to protrude, and an O-ring 218 for sealing is mounted on the outer peripheral surface.

Reference numeral 220 denotes a fitting surface provided on the pipe 200 and having a smooth circular section extending in the pipe axis direction.
Are flange portions provided on the tubes 200 and 206, respectively, and 226 is an elastic clip as a clamp member.

The elastic clip 226 is formed by bending a band-shaped metal leaf spring material into a substantially ring shape, as shown in FIG.
8 and an engagement groove 230 extending in the circumferential direction at the middle portion in the width direction.

In the case of this connection structure, the insertion shaft 216 is fitted into the inside of the tube 200, and the outer peripheral surface of the insertion shaft 216 is fitted to the fitting surface 220 via the O-ring 218.
The elastic clip 226 is inserted into the tube 2 through the fitting opening 228.
Tubes 200, 206 fitted elastically over strut 00, 206 and abutted against each other
Of the pair of flange portions 222 and 224
The pair of pipes 200 and 206 are connected in a watertight manner by being engaged in the 26 engaging groove 230.

The connection structure shown in FIG. 8 allows the connection of the pipes 200 and 206 to be performed very easily with one touch. In recent years, this connection structure has been adopted in many cases. In fact, the connection structure by the screw connection method shown in FIG. 7 and the connection structure shown in FIG. 8 still exist in reality, and therefore, for example, as a connection part on one pipe side, for example, a pipe body on the pipe side, etc. It can handle either the case where the mating side (the other tube side) is the connection method using screws shown in FIG. 7 or the case where the connection method is the insertion method by inserting the insertion shaft 216 shown in FIG. It is desirable that

[0012]

The tube connecting structure of the present invention has been devised to solve such a problem. Thus, the pipe connection structure of claim 1 is a pipe connection structure for connecting a pair of pipes,
(B) A female screw portion or a male screw portion to be screw-coupled with a male screw portion or a female screw portion on the other tube side, and (B) a hollow insertion shaft portion on the other tube side, and an outer peripheral surface of the insertion shaft portion (C) a sealing member mounted on the fitting surface and sealing a watertight seal between the fitting surface and the outer peripheral surface of the insertion shaft portion; And a stopping means for stopping the pair of pipes in the pipe axial direction in a connected state. In the present invention, the following connection structures (A) to (G) can be adopted as one embodiment.

(A) In claim 1, the stopper means is provided on the one tube and the other tube, and has an engaging portion to be engaged directly or via another member. Can be.

(B) In (A), the engaging portion comprises a flange-shaped portion projecting outward in a direction perpendicular to the tube axis, and the retaining means comprises a clamp member for clamping the engaging portion in the tube axis direction. Can be included.

(C) In (B), a cap nut having the female screw portion on the inner peripheral surface is provided on the one tubular body side on the outer peripheral surface of the tubular body on the one tubular body side and the engaging portion is provided on the outside. The pipe is mounted so as to be relatively movable in the pipe axis direction between a retracted position to be exposed to the outside and a connection position protruding in the pipe axis direction from the engagement portion. It is possible to form a stopper portion which comes into contact with a flange portion of the cap nut which faces inward in a direction perpendicular to the pipe axis to prevent the cap nut from coming off.

(D) In (C), the engaging portion in (B) can also be used as the stopper portion.

(E) In the first aspect, both the male screw portion and the female screw portion can be provided on the one tube side.

(F) In (B), both the externally threaded portion and the internally threaded portion are formed at one end of the tube main body at the one tube side, and one end is formed at one end with respect to the outer peripheral surface of the tube main body. A bag-like tubular member having the engaging portion and having an inner peripheral surface formed as the fitting surface, a connecting position where one end side of the tubular member protrudes from the pipe main body by a predetermined length in the pipe axis direction, and the male screw part. An outer fitting is provided so as to be relatively movable in the axial direction of the tube between a retracted position where the tube is retracted in a direction opposite to a position to be exposed to the outside, and a seal member between a fitting surface of the tubular members and an outer peripheral surface of the tube body. The seal can be made watertight.

(G) In any one of (B), (C), (D) and (F), the clamp member has a form in which a band-shaped leaf spring material is bent into a substantially ring shape. It has a fitting opening at a predetermined location in the circumferential direction, and can be engaged in a state where the flange portion on the one tubular body side and the mating flange portion on the other tubular body side are aligned at the middle portion in the width direction. It can be provided with an engagement groove extending along the circumferential direction.

[0020]

As described above, the connection structure according to the present invention comprises a female thread or a male thread which is screwed to a mating side of one tube, ie, a male thread or a female thread of the other tube, and the other. After inserting the hollow insertion shaft portion on the tubular body side, the fitting surface is fitted to the outer peripheral surface thereof, and a smooth fitting surface extending in the tube axis direction is mounted on the fitting surface. And a sealing member for sealing water-tightly to the outer peripheral surface of the portion, and the pair of pipes is prevented from being removed by a retaining means. In the case of this connection structure, the other side, that is, the other side In either case of the screw connection method or the insertion connection method of the hollow shaft portion on the tube side, it is possible to cope with the common connection portion, and the versatility can be improved.

Next, in the connection structure (A), an engagement portion is provided for engaging the one tube and the other tube directly or via another member in the axial direction of the tube. The above-mentioned retaining means is configured so as to include the above. According to this connection structure, the pair of pipes can be properly retained.

In the connection structure (B), the engaging portion is constituted by a flange portion projecting outward in a direction perpendicular to the tube axis, and these flange portions are clamped in the tube axis direction by a clamp member. In this connection structure, the pair of pipes can be reliably prevented from being removed. Here, the engaging portion formed of the flange portion can be constituted by a flange portion continuous in the circumferential direction.

In the connection structure (C), a cap nut is movably mounted on the one pipe side in the axial direction of the pipe, and the female screw portion on the inner peripheral side of the cap nut is screwed to the other pipe side. In the case of this connection structure, a pair of pipes can be connected by screw-connecting the cap nut to the external thread on the other pipe side.

Also, in the case where the other tube is connected by inserting the insertion shaft portion, the connection can be made by fitting this to the fitting surface of the one tube. In this case, the cap nut attached to one of the pipes is positioned at the retracted position, an engaging portion such as a flange on the one of the pipes is exposed to the outside, and a pair of pipes is provided at the engaging portion. The body is clamped by the clamp member and is stopped.

In this connection structure, a stopper portion for preventing the cap nut from being removed can be provided separately from the engaging portion, but it is preferable that the stopper portion and the engaging portion are used in combination. ((D)). This can simplify the structure of one of the tubular bodies.

The connection structure (E) has both a male screw portion and a female screw portion on one tube side. According to this connection structure, the other tube side has a male screw portion. By connecting the male screw portion to the female screw portion on one tube side, a pair of tube members can be connected. Alternatively, when the other pipe side is provided with a cap nut, a pair of pipe bodies can be connected by screw-connecting the female screw part on the inner peripheral side of the cap nut to the male screw part on one pipe body side. it can.

Further, the other tube side has an insertion shaft portion, a cap nut movably mounted in the tube axis direction on the outer peripheral surface of the tube body on the other tube side, and the outer peripheral surface of the tube body on the other tube side. And a stopper portion that defines a moving end of the cap nut in the pull-out direction, when the insertion shaft portion and the fitting surface on one of the tubular bodies are fitted watertight through a seal member. By screw-connecting the cap nut on the other tube side to the male screw portion on the one tube side, the pair of tubes can be prevented from coming off, that is, in a connected state in the tube axis direction. In this case, unlike the clamp by the clamp member as shown in FIG. 8, there is obtained an advantage that no looseness is generated between the pair of tubes and the pair of tubes can be firmly and firmly connected.

In the connection structure (F), both a male screw portion and a female screw portion are formed on one tube side, and a tube member having an engagement portion at one end is connected to the tube so as to be relatively movable in the tube axis direction. The outer peripheral surface of the main body is externally fitted, and the outer peripheral surface of the tube main body and the inner peripheral side fitting surface of the tubular member are sealed in a water-tight manner with a sealing member. Can be applied to both the case of the screw connection method and the case of the connection method by insertion of the insertion shaft part, and even if the other pipe side has a male screw part for screw connection, Any case having a cap nut provided with a portion can be used.

Specifically, when the other tube has a male thread, the pair of tubes can be connected by screw-connecting the male thread to the female thread on one tube. When the tubular body has a cap nut, a pair of tubular bodies can be connected by screwing the cap nut to the male screw portion on one tubular body.

In the case where the other tube has an insertion shaft portion, the tube member on the one tube side is protruded to the connecting position, and then the insertion shaft portion is inserted into the fitting surface on the inner peripheral side of the tube member. By connecting and fitting, a pair of pipes can be connected. At this time, the pair of pipes can be clamped by the clamp members at the engagement portions of each other, and can be prevented from coming off.

The connection structure (G) comprises a predetermined form of a clamp member, that is, a band-shaped leaf spring material, which is bent into a substantially ring shape to form a fitting opening at a predetermined location in the circumferential direction, and a widthwise intermediate portion. The connection of a pair of pipes is performed using a clamp member having an engagement groove extending along the circumferential direction. Connection can be made.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2, reference numeral 10 denotes, for example, a pipe on the pipe side, and reference numeral 12 denotes, for example, a pipe on the faucet side.
Is connected to a main pipe 14 made of a relatively soft resin pipe or the like. The other tube 12 is connected to a main tube 18 made of a relatively soft resin tube or the like.

In this embodiment, the pair of tubes 10 and 12
Also forms a connection fitting.

On one end of the tube 10, a flange portion (engaging portion) 22 which protrudes outward in the radial direction is formed on the entire outer periphery of the end portion, and an opening is formed on the inner peripheral side. Subsequently, a female screw portion 24 is formed. Further, a fitting surface 26 is formed in the inner part thereof, following the female screw part 24. Mating surface 26
Has a circular cross section and a smooth surface extending in the tube axis direction. An O-ring groove 32 is formed in the fitting surface 26, and an O-ring 34 as an elastic sealing member is mounted therein.

The other tube 12 has the flange 22
A flange portion (engaging portion) 28 having the same configuration as that of FIG. 1 is formed. Further, in FIG. 1A and FIG. A projection 30 is formed.

Reference numeral 36 denotes an elastic clip serving as a clamp member. The elastic clip 36 is formed by bending a band-shaped leaf spring material into a substantially ring shape.

The elastic clip 36 has a fitting opening 38 at a predetermined position in the circumferential direction, and an engaging groove 40 is formed in the middle part in the width direction along the circumferential direction. On the side opposite to the fitting opening 38, a relief portion 42 for avoiding interference with the flange portions 22 and 28 is formed. A guide portion 44 is formed which is open to the outside.

In FIG. 1, reference numerals 46 and 48 denote main pipes.
Or 18 is an insertion coupling part inside. In the other tube body 12 shown in FIG. 1B, a male thread portion 50 is formed following the flange portion 28.

In the connection structure of this embodiment, FIGS.
(A), when the other tube 12 has a hollow insertion shaft portion 30, first, a pair of tubes 10,
The insertion shaft 30 of the other tube 12 is inserted into the one tube 10 until the 12 flanges 22 and 28 abut against each other,
The outer peripheral surface of the insertion shaft portion 30 is connected to the female screw portion 2 on the inner peripheral side of the tubular body 10.
4 is fitted to the fitting surface 26 following. At this time, since the O-ring 34 is interposed between the outer peripheral surface of the insertion shaft portion 30 and the fitting surface 26, they are fitted in a watertight manner.

Then, under the above-mentioned fitting condition, the elastic clip 36
Are elastically fitted so as to straddle the pair of tubes 10 and 12 through the fitting openings 38, and the pair of flange portions 22 and 28 abutting are engaged with the engagement grooves 40 of the elastic clip 36, so that the pair of flanges 22 and 28 are engaged. Tubes 10 and 12 can be connected.

On the other hand, as shown in FIG. 1 and FIG. 2B, when the other tube 12 has the male thread 50, the male thread 50 is connected to the female thread 24 of the one tube 10.
By screwing in the pair, the pair of pipes 10 and 12 can be connected.

In the connection structure of this embodiment, one of the tubes 10 is
On its inner peripheral side, a female screw part 24 and a smooth fitting surface 2
6 and an O-ring 34 mounted on the mating surface 26. Therefore, according to the present embodiment, the other tube 12 is
Regardless of the type of the plug-in connection method of 0 or the screw connection method of the male screw part 50, one of the pipes 10 can be used with a common one, and the versatility can be improved. it can.

In the connection structure of this embodiment, one of the tubes 10
Is provided with a flange portion 22, so that the flange portion 2
2 and the flange portion 28 of the other tube body 12 are both engaged in the engagement groove 40 of the elastic clip 36, so that a pair of tube members 1
0 and 12 can be connected very easily with one touch by the elastic clip 36.

FIG. 3 shows another embodiment of the present invention.
One of the pipe bodies 10 in this example has a form in which a cap nut 52 which is formed separately from the pipe body 60 and has the female screw portion 24 on the inner peripheral side is externally fitted.

The cap nut 52 is formed with a radially inward flange portion 54 at the base end (the lower end in the figure). On the other hand, a large-diameter portion 56 is formed in the pipe main body 60 at a position away from the distal end by a predetermined length toward the base end side.
Reference numeral 2 denotes a retracted position where the flange portion 54 contacts the distal end surface of the large diameter portion 56 (the state shown in FIG. 2A), and a connection position where the flange portion 54 contacts the flange portion 22 at the distal end of the tube body 60 (FIG. ) Can be relatively moved in the tube axis direction.

When the cap nut 52 is at the retracted position, the flange portion 22 is exposed outside the cap nut 52. When the cap nut 52 is at the connection position, the cap nut 52 is connected to the flange portion 22. The flange portion 22 is in a position protruding further toward the distal end in the pipe axis direction, and is hidden inside the cap nut 52.

Here, the cap nut 52 is connected to its flange 5
4 comes into contact with the flange portion 22 so that the pipe body 60
The flange 22 also serves as a stopper in this example.

In this embodiment, the inner surface of the tube main body 60 is uniformly smooth from the distal end to a predetermined base end position.
The O-ring 34 is mounted in an O-ring groove 32 formed on the fitting surface 26. In the figure, 58
Is a ring-shaped packing for sealing.

In the connection structure of this embodiment, when the other tube 12 is of a plug-in connection type having the insertion shaft portion 30 as shown in FIG. 5A, the cap nut 52 is connected to the retracted position where the flange portion 22 is exposed. Then, the insertion shaft portion 30 is inserted into one of the tubular bodies 10 until the flange portions 22 and 28 contact each other,
The outer peripheral surface of the insertion shaft portion 30 is fitted to the fitting surface 26 through an O-ring 34 in a watertight manner.

Then, the elastic clip 36 is connected to the pair of pipes 10 and 1 by using the pair of flange portions 22 and 28 that abut.
2 and elastically fit over a pair of pipes 1
0 and 12 are connected.

On the other hand, as shown in FIG.
Is a screw connection type having a male screw portion 50, the cap nut 52 of one tube 10 is set as a connection position where the cap nut 52 protrudes from the flange portion 22 toward the distal end side in the tube axis direction, and the other tube body 12 male screw portions 50 are attached to cap nuts 52.
Of the tube body 12 via a ring-shaped packing 58 to connect the pair of tubes 10 and 12 in a watertight manner.

In the connection structure of this embodiment, the same effects as in the first embodiment can be obtained. That is, whether the other tube 12 is of the insertion connection method of the insertion shaft portion 30 or the screw connection method of the male screw portion 50, the one tube 10 is common and corresponds. Can be.

In the connection structure of this embodiment, in the case of the insertion connection method of the insertion shaft portion 30, the flange portion 22 of one of the pipes 10 is exposed by positioning the cap nut 52 at the retracted position. The pair of flange portions 22 and 28 can be engaged with the engagement groove 40 of the elastic clip 36 in a state where the flange portions 22 and 28 are in contact with each other, so that the pair of pipes 10 and 12 can be connected with the elastic clip 36 very easily. be able to.

FIG. 4 shows still another embodiment of the present invention. One tube body 10 in this example includes a tube body 60,
It comprises a substantially cylindrical (bag-shaped) cylindrical member 74 separate from this.

The cylindrical member 74 is provided on the fitting surface 26 having a smooth inner peripheral surface.
It has been. An O-ring groove 32 is formed in the fitting surface 26 (see FIG. 3C).
An O-ring 34 is mounted as a seal member.
The cylindrical member 74 has an outwardly facing flange portion 22 at its distal end.
However, a flange portion 78 is formed at the base end portion as an inward locking portion.

On the other hand, the pipe main body 60 is provided with a female screw portion 24 on the inner peripheral side on the distal end side, and the male screw portion 6 on the outer peripheral side.
4 are provided. An O-ring groove 32 is formed in the pipe main body 60 on a smooth outer peripheral surface following the male screw portion 64. The O-ring groove 32 has an O-ring as a sealing member.
A ring 34 is mounted.

Further, the O-ring groove 32 is provided in the pipe body 60.
A small-diameter portion 76 is formed on the base end side (lower side in the figure) in the tube axis direction over a predetermined length, and a distal end side (upper side in the figure) of the small-diameter portion 76 serves as a stopper. Stepped part 80
Are formed.

The tube member 74 is sealed to the tube body 60 by the O-ring 34 while the flange portion 78 is movable along the outer peripheral surface of the small diameter portion 76 of the tube body 60. Externally fitted so as to be movable in the tube axis direction. Here, the cylindrical member 74 is prevented from being removed from the tube main body 60 by the flange portion 78 abutting on the stepped portion 80 of the tube main body 60.

Here, a cylindrical member 74 movable in the tube axis direction.
4 (A) and 4 (B) show the retracted position where the distal end flange portion 22 is retracted from the distal end of the pipe main body 60 by a predetermined length in the pipe axis direction, as shown in FIGS. 4 (A) and 4 (B). Thus, the flange portion 22 at the distal end can be moved between a distal end of the pipe main body 60 and a connection position protruding a predetermined length in the pipe axis direction.

When the tubular member 74 is at the retracted position, the male screw portion 64 of the tube body 60 is exposed to the outside of the tubular member 74. When the tubular member 74 is at the connection position, the inner periphery of the tubular member 74 is On the side, a space of a predetermined length is formed between the distal end portion of the tube main body 60 and the flange portion 22 at the distal end of the tubular member 74.

In the connection structure of this embodiment, when the other tube 12 is of the screw connection type having the male screw portion 50 as shown in FIG. The external thread 5 of the other tube 12 is connected to the internal thread 24.
0 through a sealing tape.
0 and 12 are connected.

On the other hand, when the other tube body 12 is of the screw connection type having the female screw portion 72 as shown in FIG. 8B, the cylindrical member 74 is located at the retracted position and the male screw portion of the tube main body 60 is formed. 64 is exposed to the outside, and the female screw portion 72, that is, the cap nut 70 is screwed into the exposed male screw portion 64 via the packing 58, thereby connecting the pair of tubes 10 and 12. Do.

On the other hand, when the other tube body 12 is of the plug-in connection type having the insertion shaft portion 30 as shown in FIG.
After a predetermined space is formed between the distal end portion of the tubular member 12 and the flange portion 22, the insertion shaft portion 30 of the other tubular body 12 is inserted into the space, and the outer peripheral surface of the insertion shaft portion 30 is inserted into the cylindrical member 74. Water-tightly fits on the peripheral surface, that is, the fitting surface 26 via the O-ring 34.

At the same time, the elastic clip 36 is connected to one of the tubular members 1.
The pair of pipes 10, 12 is connected by using the flange 22 at 0 and the flange 28 at the other pipe 12 to elastically fit over the pipes 10, 12.

In the connection structure of this embodiment, the other tube 1
2 is the insertion connection method of the insertion shaft part 30 or the male screw part 50
, Or the screw connection method using the female screw portion 72, the common pipe 10 can be used.

FIG. 5 and FIG. 6 show still another embodiment of the present invention. On one end of the tubular body 10 in this example, a female screw portion 24 and a male screw portion 64 are provided on the inner surface side and the outer surface side on the distal end side, and a smooth fitting surface is provided on the inner surface side following the female screw portion 24. 26 are formed. An O-ring groove 32 is formed in the fitting surface 26, and an O-ring 34 for sealing is mounted therein.

On the other hand, as shown in FIG. 5A, the other tube body 12 is provided with a cap nut 70 having a female screw portion 72 on the inner peripheral side, and the cap nut 70 is provided by the cap nut 70. An insertion shaft portion 30 is provided which protrudes toward the distal end in the direction.

In the connection structure of this example, first, the insertion shaft portion 30 of the other tube 12 is inserted into the one tube 10 and fitted to the fitting surface 26 in a watertight manner via the O-ring 34. .
Subsequently, the female screw portion 72 of the other tube body 12, that is, the cap nut 7
0 is screwed into the male screw portion 64 of one of the tubes 10,
In this way, the pair of tubes 10 and 12 are securely connected (see FIG. 6A).

One tube 10 in the connection structure of this example
As shown in FIGS. 5B and 5C, the other pipe 12 has a screw connection system having a male screw portion 50 or a screw connection system having only a female screw portion 72 having no insertion shaft portion 30. It is possible to cope with any of them.

That is, in the case of FIG. 5B, the external thread 50 of the other tube 12 is connected to the internal thread 24 of the inner periphery of the one tube 10.
By screwing into the tube, the pair of tubes 10 and 12 can be connected (see FIG. 6B), and in the case of FIG.
Female thread 72 on the outer peripheral side of one tube 10
4 to connect the pair of tubes 10 and 12 (see FIG. 6C).

Although the embodiments of the present invention have been described in detail above, these are merely examples, and for example, the elastic clip 3 in the above example is used as a clamp member for clamping a pair of tubes.
It is also possible to use a configuration other than 6. In some cases, the main pipe 14 constitutes one pipe body,
A male thread, a female thread, a flange, a fitting surface, and the like to be provided on one of the tubes may be formed integrally with the main pipe 14.

Further, in the embodiment shown in FIG. 4, an inward flange portion 78 is provided on the cylindrical member 74 as a locking portion, and this is brought into contact with a stepped portion 80 as a stopper formed on one of the tube bodies 10 itself. The cylindrical member 74 is prevented from coming off by being in contact with the cylindrical member 74. For example, a stopper portion is provided on the tube body 10 side and surrounds the tube member. It is also possible to lock the tubular member 74 by locking the provided locking portion such as an outward flange portion.

Further, in the embodiment shown in FIG.
Although both the female screw portion 24 and the male screw portion 64 are provided on the distal end side of the tube 10, only the male screw portion 64 is provided as the screw portion, and the smooth fitting surface 26 is provided on the inner surface side of the tube 10 to fit the male screw portion 64. The sealing member is attached to the mating surface 26, and the other tube 1
As 2, it is also possible to connect those shown in FIG. 5A or FIG.

Further, in the present invention, the pair of tubes is elastically fitted with a predetermined frictional force and is prevented from being pulled out by the frictional force between the pair of tubes. The present invention can be configured in a form in which various changes are made without departing from the gist of the present invention, for example, the frictional force can be configured as a retaining means.

[Brief description of the drawings]

FIG. 1 is a view showing a pair of pipes and a clamp member in a pipe connection structure according to an embodiment of the present invention.

FIG. 2 is a view showing a state in which a pair of pipes in FIG. 1 are connected.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing still another embodiment of the present invention.

FIG. 5 is a diagram showing still another embodiment of the present invention.

6 is a view showing a state in which a pair of pipes in FIG. 5 are connected.

FIG. 7 is a view showing a conventional pipe connection structure.

FIG. 8 is a view showing another conventional pipe connection structure different from FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 One pipe 12 The other pipe 22 Flange part (engagement part) 24 Female screw part 26 Fitting surface 28 Flange part (engagement part) 30 Insert shaft part 34 O-ring (seal member) 36 Elastic clip (clamp member) 50 male screw part 52 cap nut 60 pipe body 64 male screw part 72 female screw part 74 cylinder member 78 flange part (locking part) 80 stepped part (stopper part)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshihiro Minami 5-1-1 Koiehoncho, Tokoname-shi, Aichi Prefecture Inax Corporation (72) Inventor Shigeru 5-1-1 Koiehonmachi, Tokoname-shi, Aichi Prefecture Inax Corporation (72) Inventor Masaaki Nagata 5-1-1 Koiehoncho, Tokoname-shi, Aichi F-term in Inax Co., Ltd. (Reference) 3H013 GA08 3J106 AB01 BA01 BB01 BC04 BC06 BD01 BD03 BE12 BE40 CA03 EA03 EB08 EC01 EC07 ED36 EE02 EF05

Claims (1)

[Claims] 1. A pipe connection structure for connecting a pair of pipes, comprising: (a) a female thread or a male thread which is screw-coupled to a male thread or a female thread of the other pipe;
(B) After inserting the hollow insertion shaft part on the other tube side,
(C) a smooth fitting surface that extends in the tube axis direction and fits on the outer peripheral surface of the insertion shaft portion; and (c) is mounted on the fitting surface, and is between the fitting surface and the outer peripheral surface of the insertion shaft portion. And a sealing member for sealing the pipes in a water-tight manner, and a stopper means for preventing the pair of pipes from coming off in the pipe axis direction in a connected state.