JP2000088157A - Pipe body connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable connection by one common pipe body even in the case that one pipe side connected to the other pipe body has a screw part, and also even in a case of an insertion connection type wherein after internal insertion or external insertion of a protrusion or a recessed fit-in surface, clamping by a clamp member is effected for connection. SOLUTION: A female screw part 24 is formed in one pipe body 10 and a recessed fit-in surface 26 continued thereto is provided. In the case that the other pipe body 12 is of an insertion connection system for a protrusion fit-in surface 35, the protrusion fit-in surface 35 is inserted in the pipe body 10, contact seal surfaces 28 and 36 are forced into watertight contact in the axial direction of a pipe through a seal member 30. In this state, a pair of the pipe bodies 10 and 12 are clamped by an elastic clip 37 by utilizing flange parts 22 and 32 and connected. In the case that the other pipe body 12 is of a screw connection system having a male screw part 50, a pair of the pipe bodies 10 and 12 are interconnected by inserting the male screw part 50 in the female screw part 24 of the pipe body 10.

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. 20 has been generally adopted as a connection structure for connecting a faucet and a pipe. In the figure, reference numeral 200 denotes a pipe on the piping side, which has a female screw portion 202 (FIG. 1A) on the inner peripheral side of a tip portion or a male screw portion 204 (FIG. 2B) on the outer peripheral side.

[0003] Reference numeral 206 denotes a tube on the faucet side, which is provided with a male nut 208 (FIG. 1A) on the outer peripheral side of the tip or a cap nut 212 (FIG. 2B) having an internal 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. 20, it is necessary to rotate the seal tape or use a tool to rotate the screw portion many times in order to screw the screw portion 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. 21 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 portion having a circular cross section provided on the pipe 206 so as to protrude, and has a smooth convex fitting surface 217 whose outer peripheral surface is circular and extends in the pipe axis direction. Is provided with an O-ring 218 for sealing.

Reference numeral 220 denotes a smooth circular concave fitting surface provided on the tube 200 and extending in the tube axis direction. Reference numerals 222 and 224 denote flange portions provided as flanges provided on the tubes 200 and 206, respectively. 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 portion 216 is inserted into the inside of the tube 200, and the convex fitting surface 217 is
18, and the elastic clip 226 is fitted through the fitting opening 228 into the tubular body 200, 2.
06 and a pair of flange portions 222, 224 fitted elastically so as to straddle and
Is engaged in the engagement groove 230 of the elastic clip 226 to connect the pair of pipes 200 and 206 in a watertight manner.

The connection structure shown in FIG. 21 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 using the screw connection method shown in FIG. 20 and the connection structure shown in FIG. 21 still exist in actuality. Therefore, for example, as a connection portion on one pipe side such as a pipe side pipe, It is desirable to be able to cope with either the case where the mating side (the other tube side) is a connection method using a screw shown in FIG. 20 or the connection method using a plug shown in FIG. .

[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 thread or a male thread which is screw-coupled to a male thread or a female thread on the other tubular body; and (b) a concave or a concave fitting into the convex or concave fitting surface of the other tubular body in the pipe axis direction. A convex fitting surface, and (c) a contact sealing surface that abuts against the contact sealing surface on the other tube side in the tube axis direction via a sealing member to seal a gap between the pair of tubes in a watertight manner. In addition to the above, there is provided a retaining means for retaining the pair of pipes in the pipe axial direction in a connected state.

[0013] A second aspect of the invention is characterized in that, in the first aspect, both the male screw portion and the female screw portion are provided on the one tube side.

According to a third aspect of the present invention, there is provided a tube connecting structure.
In any one of the above, the retaining means is provided on the one tube and the other tube, and has an engaging portion to be engaged directly or via another member.

According to a fourth aspect of the present invention, in the third aspect, the engaging portion comprises a flange-shaped portion projecting outward in a direction perpendicular to the tube axis, and the retaining means connects the engaging portion. It is characterized by including a clamp member for clamping in the tube axis direction.

According to a fifth aspect of the present invention, in the tube connecting structure according to the fourth aspect, a cap nut having an internal thread portion on an inner peripheral surface is provided on the one tubular body side, and an outer peripheral surface of a tube body on the one tubular body side is provided. And an outer peripheral surface of the pipe main body, which is mounted so as to be relatively movable in the pipe axis direction between a retracted position at which the engagement portion is exposed to the outside and a connection position protruding from the engagement portion in the pipe axis direction. A stopper portion is formed at the connection position, the stopper portion being in contact with an inward flange portion of the cap nut in a direction perpendicular to the pipe axis to prevent the cap nut from coming off.

According to a sixth aspect of the present invention, in the tube connecting structure of the fifth aspect, the engaging portion of the fourth aspect also serves as the stopper.

According to a seventh aspect of the present invention, there is provided a tube connecting structure.
In any one of the above, the concave fitting surface is formed on an inner peripheral surface of the tube main body on the one tube side.

According to an eighth aspect of the present invention, in the tube connecting structure according to the fourth aspect, the one tube side has the engaging portion at one end with respect to the outer peripheral surface of the tube main body, and the concave fitting on the inner peripheral surface. A bag-like tubular member having a mating surface is connected to a connecting position where one end side of the tubular body is protruded from the pipe body by a predetermined length in the pipe axis direction, and the male screw portion or female screw portion on the other pipe side is connected to the one pipe. It is characterized in that it is fitted externally so as to be relatively movable in the tube axis direction between a retracted position in which it is retracted in the opposite direction to a position where it can be screw-coupled to a female screw portion or a male screw portion on the body side.

According to a ninth aspect of the present invention, in the ninth aspect, a male screw portion is formed at an end of the pipe main body on the one tube side, and the male screw portion is externally provided at a retracted position of the tubular member. It is characterized by being made to be exposed to.

According to a tenth aspect of the present invention, there is provided a tube connection structure according to the fourth aspect.
In any one of 9, the clamp member has a form in which a band-shaped leaf spring material is bent into a substantially ring shape, has a fitting opening at a predetermined position in a circumferential direction, and has a widthwise middle portion. And an engaging groove extending along the circumferential direction, which can be engaged in a state where the flange portion on the one tube side and the mating flange portion on the other tube side are fitted together. And

[0022]

As described above, the connecting structure according to the first aspect of the present invention includes a female thread or a male thread which is screw-connected to a mating side of one tube, that is, a male thread or a female thread of the other tube. A concave or convex fitting surface that fits in the tube axis direction with the convex or concave fitting surface on the tube body side, and a contact member in the tube axis direction with a contact sealing surface on the other tube body via a seal member. contact,
And a contact sealing surface for sealing between them in a water-tight manner, and a pair of pipes are prevented from being removed by a retaining means. In the case of this connection structure, a mating side, that is, the other pipe side , Which can be coped with a common connection portion, and can be used more versatilely. In this case, the concave or convex fitting surface can be a smooth surface extending in the tube axis direction.

According to a second aspect of the present invention, there is provided a connection structure in which one of the pipes has both a male screw portion and a female screw portion, and according to this connection structure, the other pipe has a male screw portion. The pair of pipes can be connected by screwing the male screw part to the female screw part on one pipe side. Alternatively, when the other tube side is provided with a cap nut, a pair of pipe bodies can be connected by screw-connecting the internal thread portion on the inner peripheral side of the cap nut to the male thread portion on one tube side.

Further, the other tube side has a convex fitting surface, a cap nut mounted on the outer peripheral surface of the tube body on the other tube side so as to be movable in the tube axis direction, and an outer periphery of the tube body on the other tube side. And a stopper portion that is formed on the surface and defines a moving end of the cap nut in the pull-out direction, the convex fitting surface and the concave fitting surface on one of the tubular bodies are fitted in a watertight manner via a seal member. At the same time, the cap nut on the other tube side is screwed to the male screw portion on the one tube side to prevent the pair of tubes from coming off, that is, to be connected in the tube axis direction. In this case, unlike the clamp by the clamp member as shown in FIG. 21, there is provided an advantage that the pair of pipes does not rattle and the pair of pipes can be firmly and firmly connected.

According to a third aspect of the present invention, there is provided a connecting structure in which the one pipe and the other pipe are provided with engaging portions which are engaged with each other in the axial direction of the pipe directly or via another member, and include these engaging portions. In this way, the retaining means is configured, and according to this connection structure, the pair of pipes can be favorably retained.

According to a fourth aspect of the present invention, the engaging portion is constituted by a flange portion projecting outward in a direction perpendicular to the tube axis, and the flange portion is 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 that is continuous in the circumferential direction.

According to a fifth aspect of the present invention, a cap nut is mounted on the one pipe side so as to be movable in the pipe axis direction, and a 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 screwing the cap nut to the external thread on the other pipe side.

Even in the case of a connection system in which the other tube side is inserted by inserting the above-mentioned convex or concave fitting surface, connection is made by fitting this to the concave or convex fitting surface of the one tube side. Can be. In this case, the cap nut attached to one of the tubular bodies is located at the retracted position, and the engaging portion such as the flange of the one tubular body is exposed to the outside,
Then, the pair of pipes is clamped by the clamp member at the engaging portion and is prevented from being removed.

In this connection structure, a stopper portion for preventing the cap nut from being removed can be provided separately from the above-mentioned engaging portion, but it is desirable that the stopper portion and the engaging portion also be used. (Claim 6). This can simplify the structure of one of the tubular bodies.

In the connection structure of the fifth and sixth aspects, it is possible to form a convex fitting surface on one of the tubular bodies.
In these claims 5 and 6, it is desirable to form a concave fitting surface on the inner peripheral surface of the tube main body on one tube body side (claim 7). When such a concave fitting surface is formed in a tube provided with such a cap nut, and this is fitted to the mating convex fitting surface, the structure of one tube is complicated. Can be avoided.

In the connection structure according to the present invention, a cylindrical member having an engagement portion at one end is externally fitted to the outer peripheral surface of the tube main body in a state of being relatively movable in the tube axis direction. It is possible to cope with both the case of the screw connection type and the case of the plug-in connection type on the tube side.

Specifically, when the other tube side is of a screw connection type, a male screw portion or a female screw portion of the other tube side is screw-connected to a female screw portion or a male screw portion of one tube side to form a pair. When the tubular body can be in a connected state, and the other tubular body has a convex fitting surface, the tubular member on one tubular body is protruded to the coupling position, and then the concave fitting on the inner peripheral side of the tubular member is performed. By fitting the convex fitting surface to the mating surface,
A pair of tubes can be connected. In this case, the retaining means is configured to include a pair of engaging portions each formed of a flange-shaped portion of the pair of tubular bodies and a clamp member, and the pair of engaging portions is clamped by the clamp members to prevent the pair of tubular members from coming off. And so on.

In the connecting structure according to the eighth aspect, a male screw portion is formed at one end of the tube body at one tube side, and the male screw portion is exposed to the outside at the retracted position of the tubular member. (Claim 9). In this case, by positioning the tubular member at the retracted position, the female screw portion on the other tube side is screw-coupled to the male screw portion, thereby bringing the pair of tube members into a connected state. Can be.

In addition, while the male screw portion is formed as described above, the female screw portion is formed on the inner peripheral side of the end portion of the tube main body.
Even when the other tube side has a male screw portion, the pair of tubes can be connected by screwing the male screw portion of the other tube side to the female screw portion.

According to a tenth aspect of the present invention, in the connecting structure, a predetermined form of a clamp member, that is, a band-shaped leaf spring material is bent into a substantially ring shape to form a fitting opening at a predetermined position in a circumferential direction, and a widthwise intermediate portion is formed. A pair of pipes is connected by using a clamp member having an engagement groove extending along the circumferential direction. Body connections can be made.

[0036]

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 pipes 10, 12
Also forms a connection fitting.

One tubular body 10 is provided with an outer cylindrical portion 20 having a circular cross section, and a flange portion (engaging portion) as a flange-like portion protruding outward in the radial direction on the outer peripheral surface of the end portion. ) 22
Is formed over the entire circumference, and a female screw portion 24 is formed on the inner peripheral side following the opening. Further, a concave fitting surface 26 is formed in the inner part following the female screw part 24. The concave fitting surface 26 is a smooth surface having a circular cross section and extending in the tube axis direction.

The base end of the outer tube portion 20 is stepped, and a contact seal surface 28 perpendicular to the tube axis is formed in the stepped portion. An annular groove is formed in the contact seal surface 28, and a seal member 30 made of an O-ring is fitted and mounted therein.

The other pipe 12 has the flange 22
Flange portion (engaging portion) 3 as a flange portion having the same configuration as
1 and 2 (A), an insertion shaft portion 34 having a hollow inner cross section and a circular cross section is formed to protrude following the flange portion 32. The outer peripheral surface of the insertion shaft portion 34 is a convex fitting surface 35 having a circular cross section and a smooth surface in the tube axis direction. The distal end surface of the insertion shaft portion 34 is a contact seal surface 36 corresponding to the contact seal surface 28 of the one tubular body 10, that is, a contact seal surface 36 perpendicular to the tube axis.

Reference numeral 37 denotes an elastic clip as a clamp member. The elastic clip 37 is formed by bending a band-shaped leaf spring material into a substantially ring shape.

The elastic clip 37 has a fitting opening 38 at a predetermined position in the circumferential direction, and an engagement 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 32 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 14,
18 is an insertion connection part into the inside. In the other tube body 12 shown in FIG. 1B, a male screw portion 50 is formed following the flange portion 32.

In the connection structure of this embodiment, FIGS.
(A), when the other tube 12 has the convex fitting surface 35, first, the insertion shaft portion 34 of the other tube 12 is inserted into the outer tube portion 20 of the one tube 10. Then, the contact seal surface 36 is inserted through the seal member 30 to a position where the contact seal surface 36 contacts the corresponding contact seal surface 28 of the one tubular body 10. Then, the convex fitting surface 35 on the outer peripheral surface of the insertion shaft portion 34 is fitted to the concave fitting surface 26 of the one tubular body 10. At this time, the tube 1
The pair of flange portions 22 and 32 at 0 and 12 are substantially in contact with each other. The length of the insertion shaft portion 34 is determined in advance as such.

Then, under the fitted state, the elastic clip 3
7 is elastically fitted so as to straddle the pair of pipes 10 and 12 through the fitting opening 38, and the pair of flanges 2
The pair of pipes 10 and 12 can be connected by engaging the engagement grooves 2 and 32 with the engagement grooves 40 of the elastic clip 37.

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 pipes 10
On its inner peripheral side, a female thread portion 24 and a smooth concave fitting surface 26 following the female thread portion 24 are provided. Therefore, according to the present embodiment, the other tube body 12 has a plug-in connection method of the convex fitting surface 35 or a male screw. Part 5
In any case of the screw connection method by 0,
One of the pipes 10 can be used with a common one, and versatility can be improved.

In the connection structure of this embodiment, one of the tubes 10
Is provided with the flange portion 22, the flange portion 2
The pair of tubes 10 and 12 can be connected with the elastic clip 37 very easily with one touch only by engaging both the 2 and the flange portion 32 of the other tube 12 in the engagement groove 40 of the elastic clip 37. Can be. In the connected state, the pair of pipes 10 and 12 are sealed watertight by the contact of the pair of contact seal surfaces 28 and 36 via the seal member 30.

In the above example, an O-ring having a circular cross section is used as the seal member 30, and the pair of pipes 10, 12 is connected with the O-ring mounted on one of the pipes 10. However, as shown in FIG. 3 (A), a seal member 30 having a rectangular cross section is used, and this is attached to one of the tubes 10 so that a pair of tubes 10, 1
2 may be connected, or FIG. 3 (B)
As shown in FIG. 3, a seal member 30 having a circular or square cross section is not mounted in advance on either one of the pipes 10 and the other pipe 12, and a pair of pipes 10, 12
When connecting the sealing member 30 to the sealing surface 2
8 and 36 so that the pipes 10 and 12
The space may be sealed in a watertight manner. This is the same in the following embodiments.

FIG. 4 shows another embodiment of the present invention.
One tube body 10 in this example has a form in which a cap nut 52 which is a separate body from the tube body 60 and has a female screw portion 24 on the inner peripheral side is externally fitted.

The cap nut 52 is formed with a radially inward flange 54 at a base end (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 tip by a predetermined length in the pipe axis direction.
Reference numeral 2 denotes a retracted position (position (A) in the drawing) where the flange portion 54 contacts the distal end surface of the large diameter portion 56, and a connection position ((B) in the drawing) where the flange portion 54 contacts the flange portion 22 at the distal end of the tube main body 60. ) Can be relatively moved in the tube axis direction.

When the cap nut 52 is at the retracted position, the flange 22 is exposed outside the cap nut 52. When the cap nut 52 is at the connection position, the cap nut 52 is At the position protruding toward the distal end side in the pipe axis direction, the flange portion 22 is hidden inside the cap nut 52.

Here, the cap nut 52 is connected to its flange 5
4 comes in contact with the flange portion 22 of the tube main body 60, thereby preventing the tube main body 60 from being pulled out. That is, in this example, the flange portion 22 also serves as the stopper portion.

In this embodiment, a concave fitting surface 26 is formed on the inner peripheral surface of the pipe main body 60 over a predetermined length in the pipe axial direction from the distal end thereof. An abutting seal surface 28 is formed at the end of the concave fitting surface 26, and an O-ring or other form of seal member 30 is mounted thereon.

In the connection structure of this embodiment, as shown in FIG. 5A, when the other tube body 12 is a plug-in connection method having a convex fitting surface 35, the cap nut 52 is moved to the retracted position where the flange portion 22 is exposed. After being positioned, the insertion shaft 3
4 is inserted into the outer cylindrical portion 20 of the tubular body 10 so that the convex fitting surface 35 is fitted to the concave fitting surface 26, and the pair of contact seal surfaces 36 and 28 are connected via the seal member 30. Abut. In this state, the elastic clip 37 is connected to the pair of pipes 1.
0 and 12 are elastically fitted so as to straddle the pair of pipes 10 and 10 using the pair of flanges 22 and 32.
12 is connected.

On the other hand, as shown in FIG.
Is a screw connection type having an external thread portion 50, the cap nut 52 of one tube 10 is set as a connection position protruding from the flange portion 22 toward the distal end side in the tube axis direction, and the external thread portion of the other tube 12 is 50 is the female thread portion 24 of the cap nut 52
And the distal end surface of the tube 12 is brought into contact with the distal end surface of the tube 10 via a ring-shaped sealing member 58, thereby connecting the pair of tubes 10 and 12 in a watertight manner.

At this time, the tip surfaces of the tubes 10 and 12 serve as second abutting seal surfaces 61 and 62, and sandwich the seal member 58 in the tube axis direction.
Seal the gap watertight.

In the connection of this embodiment, the same effect as in the first embodiment can be obtained. That is, the other tube 1
Regardless of which of the two types is the plug-in connection method of the convex fitting surface 35 or the screw connection method by the male screw part 50, one tube 10 can be used with a common one.

In the connection structure of the present embodiment, in the case of the plug-in connection method of the convex fitting surface 35, the cap nut 52 is positioned at the retracted position to expose the flange portion 22 of one of the pipes 10 to the exposed state. Then, the pair of flanges 22 and 32 are engaged with the engagement groove 40 of the elastic clip 37 in a state where the flanges 22 and 32 are in contact with each other, so that the pair of pipes 10 and 12
Connection can be made very easily at 7.

FIG. 5 shows still another embodiment of the present invention. One of the tubes 10 in this example includes a tube main body 60 and a substantially cylindrical (bag-shaped) cylindrical member 74 separate from the tube main body 60. The cylindrical member 74 has a concave fitting surface 26 on the inner peripheral surface, an outward flange 22 at the distal end, and a flange 78 as an inward locking portion at the proximal end. ing.

On the other hand, the pipe main body 60 is provided with a female screw part 24 on the inner peripheral side on the distal end side and a male screw part 64 on the outer peripheral side, respectively.
A ring-shaped or other ring-shaped seal member 30 is mounted.

A portion of the outer peripheral surface of the tube main body 60 following the male screw portion 64 is a smooth surface, and the concave fitting surface 26 of the tubular member 74 is fitted to the portion so as to be slidable in the tube axis direction. Have been.

Further, a small-diameter portion 76 is formed in the pipe main body 60 over a predetermined length in the pipe axis direction.
A stepped portion 8 as a stopper is provided at the tip side (upper side in the figure) of
0 is formed. And the small diameter portion 7 of this pipe main body 60
The tubular member 74 is fitted to the pipe main body 60 so as to be movable in the pipe axis direction while the flange portion 78 is movable along the outer peripheral surface of the tube 6.

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. As shown in FIGS. 5A and 5B, the tubular member 74 has a retracted position in which the flange portion 22 at the distal end is retracted from the distal end of the pipe main body 60 by a predetermined length in the pipe axis direction, and is shown in FIG. As described above, 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 main body 60 is exposed to the outside of the tubular member 74. When the tubular member 74 is at the connection position, the inside of the tubular member 74 is The tip of the tube body 60 and the tubular member 7
A space of a predetermined length is formed between the front end 4 and the flange portion 22.

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 male screw portion 50 of the other tube 12 is screwed into the tube 24 via a seal tape, so that a pair of tube 1
0 and 12 can be connected.

In the case where the other tube 12 is of a screw connection type having a female screw portion 72 as shown in FIG.
The male member 64 of the tube body 60 is exposed to the outside by positioning the tubular member 74 at the retracted position, and the female screw 72, that is, the cap nut 7
By screwing 0, the pair of pipes 10 and 12 can be connected.

At this time, the pair of pipes 10 and 12 can be connected in a watertight manner by screwing the female screw 72 of the cap nut 70 into the male screw 64 via the sealing tape wound around the male screw 64. However, as shown in FIG. 2B, the distal end face of the flange portion 32 in the other pipe body 12 is used as a second contact seal face 62, and the second contact seal face 62 is used as one pipe. The contact seal surface 2 of the tube body 10 via a ring-shaped seal member 30 previously mounted on the body 10
By making contact with 8, a pair of pipes 10 and 12 can be sealed in a watertight manner.

When the other tube body 12 is of a plug-in connection type having a convex fitting surface 35 as shown in FIG.
After the cylinder member 74 is positioned at the connection position and a predetermined space is formed between the distal end portion of the tube main body 60 and the flange portion 22, the insertion shaft portion 34 of the other tube body 12 is inserted into the space. The convex fitting surface 35 of the insertion shaft portion 34 is fitted to the concave fitting surface 26 of the tubular member 74, and the contact sealing surface 36 at the tip of the insertion shaft portion 34 is fitted to the contact sealing surface 28 of the tube 10. On the other hand, it is brought into water-tight contact with the seal member 30 interposed therebetween.

In this state, the elastic clip 37 is elastically fitted over the tubes 10 and 12, and the flange portions 22 and 32 of the tubes 10 and 12 are engaged in the engagement grooves 40 of the elastic clip 37. This allows the pair of pipes 10 and 12 to be in a watertight connection state.

In the connection structure of this embodiment, the other tube 1
Regardless of which of the two types is a plug-in connection method of the convex fitting surface 35, a screw connection method using the male screw part 50, or a screw connection method using the female screw part 72, the common pipe 1
0 can correspond.

FIG. 6 shows still another embodiment of the present invention. On one end of the tube 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 extend on the inner surface side in the tube axial direction following the female screw portion 64. A smooth concave fitting surface 26 is formed. Further, also in this example, the base end portion of the outer cylindrical portion 20 is a stepped portion, and a contact seal surface 28 perpendicular to the tube axis is formed there, and a ring-shaped seal member such as an O-ring is formed there. 30 is mounted.

The other pipe 12 has an internal thread 7
2 is provided, and an insertion shaft portion 34 in a form protruding from the cap nut 70 toward the distal end in the tube axis direction is provided, and the insertion shaft portion 34 is provided.
In addition, a smooth convex fitting surface 35 extending in the tube axis direction is formed. A contact seal surface 36 is formed at the tip.

In the connection structure of this example, first, the insertion shaft portion 34 of the other tube 12 is inserted into the inside of one tube 10 so that the convex fitting surface 35 is fitted to the concave fitting surface 26,
The contact seal surface 36 of the tube 12 is brought into contact with the contact seal surface 28 of the tube 10 via the seal member 30, and the space therebetween is sealed in a watertight manner.

The female thread portion 7 of the other tube 12
2, ie, the cap nut 70 is connected to the male thread 64
, The pair of pipes 10 and 12 can be firmly connected in a fixed state.

One tube 10 in the connection structure of this example
As shown in FIGS. 6B and 6C, the other tube 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 convex fitting surface 35. Any of the above can be supported.

That is, in the case of (B), a pair of pipes 10 and 12 can be connected by screwing the male screw 50 of the other pipe 12 into the female screw 24 on the inner peripheral side of one pipe 10. In the case of C), the pair of tubes 10 and 12 can be connected by screwing the female thread 72 of the other tube 12 into the male thread 64 of one tube 10 (see FIG. 7).

In the above embodiment, when the other tube 12 is of the plug-in connection type having the convex fitting surface 35, the contact seal surface 28 of the one tube 10 is previously provided with a ring-shaped O-ring or the like. The sealing member 30 is mounted, and in this state, the pair of pipes 10 and 12 are connected to each other. As shown in FIGS. It is also possible to attach a ring-shaped seal member 30 made of the above and connect the pair of pipes 10 and 12 in that state.

FIG. 12 shows still another embodiment of the present invention. In this example, one tube body 10 has a female screw portion 24 on the inside of the end, and a convex fitting surface 82 is formed on the outside. The distal end surface is a contact seal surface 28, on which a ring-shaped seal member 30 such as an O-ring is mounted.

On the other hand, the tube body 12 has an outer insertion tube portion 84 having a circular cross section, and a smooth concave fitting surface 86 extending in the tube axis direction is formed on the inner peripheral surface thereof. In addition, the outer tube 8
A contact seal surface 36 perpendicular to the tube axis is formed at the base end portion of No. 4 (see FIG. 13A).

In the connection structure of this embodiment, when the other tube body 12 is of a plug-in connection type having a concave fitting surface 86 as shown in FIG. To the convex fitting surface 82 of one of the tubular bodies 10 and
The contact sealing surface 36 formed at the base end of the four
Is brought into contact with the contact seal surface 28 via the seal member 30.

At this time, the flange portions 22 and 32 of the pair of pipes 10 and 12 come into contact with each other (the positions of the flange portions 22 and 32 are determined in this manner).
Then, the elastic clip 37 is connected to the pair of tubes 10 and 12.
And fit over the flanges 22 and 3
The pair of pipes 10, 12 can be brought into a watertight connection state by engaging the engaging member 2 in the engaging groove 40 of the elastic clip 37 (see FIG. 13A).

On the other hand, the other tubular body 12 is
In the case of a screw connection type having a threaded portion, the male threaded portion 50 is screwed into the female threaded portion 24 of one of the tubes 10 via a seal tape, so that the pair of tubes 10 and 12 are connected to each other in a watertight manner. (See FIG. 13B). At this time, the lower surface in the figure of the flange portion 32 is used as a second contact seal surface 62, which is brought into contact with the contact seal surface 28 of one of the tubular bodies 10 via the seal member 30. By doing, a pair of pipes 10, 12
The space can be sealed watertight.

FIG. 14 shows still another embodiment of the present invention. In this example, a female screw portion 24 is provided on the inner peripheral side of the distal end portion of one of the tubular bodies 10 and a male screw portion 64 is provided on the outer peripheral side thereof. The seal member 30 is mounted. Further, a convex fitting surface 82 is formed on the outer peripheral surface of the tubular body 10 and a portion following the male screw portion 64.

In this connection structure, the other tube 12
Is a plug-in connection type having a concave fitting surface 86 as shown in (A), the concave fitting surface 86 is connected to the convex fitting surface 82 of one tube body 10 in the tube axis direction. At the same time, the pair of abutting sealing surfaces 28 and 36 are brought into contact with each other via the sealing member 30, and in this state, the elastic clip 37 is fitted over the pair of pipes 10 and 12, and the flange portions 22 and 36 are fitted. By engaging the engagement groove 32 of the elastic clip 37 with the engagement member 32, the tubes 10 and 12 can be brought into a watertight connection state (see FIG. 15A).

On the other hand, when the other tube 12 is of the screw connection type having the cap nut 70 shown in FIG. 14B, the cap nut 70 is screwed into the male screw portion 64 to form the pair of pipes 10. , 12 can be connected to each other (see FIG. 15B). At this time, by connecting the male screw portion 64 and the female screw portion 72 of the cap nut 70 with a screw via a seal tape, the tubes 10 and 12 can be sealed in a watertight manner. 1
The lower surface of the second flange portion 32 in the drawing is the second contact seal surface 6.
2, the second contact sealing surface 62 and one of the tubular bodies 1
The abutting sealing surface 28 is abutted in the axial direction of the tube via the sealing member 30 so that the tube bodies 10 and 12 can be sealed in a watertight manner.

When the other tube 12 is of a screw connection type having a male screw portion 50 shown in FIG.
By screwing the male screw portion 50 into the female screw portion 24 of one of the tubes 10, the pair of tubes 10, 12 can be connected (see FIG. 15C).

In this case as well, the external thread 50 and the internal thread 24 can be screwed together with a seal tape to seal the pipes 10 and 12 in a watertight manner. The lower surface in the figure of the portion 32 is a second contact seal surface 62, and the seal member 30 is sandwiched between the second contact seal surface 62 and the contact seal surface 28 of the tubular body 10 in the tube axis direction. The space between the tubes 10 and 12 can be sealed watertight.

In the embodiments of FIGS. 12 to 15 described above, when the other tube 12 is of a plug-in connection type having a concave fitting surface 86, the contact seal surface 28 of one tube 10 is A pair of pipes 10 and 12 are connected in this state with a seal member 30 made of a ring or the like mounted in advance, but as shown in FIGS. It is also possible to attach a seal member 30 made of an O-ring or the like on the side in advance and connect the pair of pipes 10 and 12 in that state.

Alternatively, even when the other tube 12 is of a screw connection type having a male thread or a female thread,
It is also possible to mount a seal member on the other tube 12 side in advance and connect the pair of tubes 10 and 12 to each other in this state.

Although the embodiments of the present invention have been described in detail above, these are merely examples. For example, the elastic clip 37 in the above example is used as a clamp member for clamping a pair of tubes.
Other forms may be used. In some cases, one main body is constituted by the main pipe 14, and a male screw portion, a female screw portion, a flange portion, a concave or convex fitting surface, etc. to be provided on the one main body side are formed integrally with the main pipe 14. Is also possible. Further, in the embodiment shown in FIG. 5, an inward flange portion 78 is provided as a locking portion on the cylindrical member 74, and this is brought into contact with a stepped portion 80 as a stopper portion formed on one of the tubular bodies 10 itself. Although the tubular member 74 is prevented from being pulled out, a stopper portion is provided on the tubular body 10 side and surrounding the tubular body, for example, a stopper is provided on the inner surface of the block-shaped member, and the outer portion provided on the tubular member 74 there. It is also possible to lock the cylindrical member 74 by locking the locking portion such as the direction flange portion.

Further, in the present invention, a pair of pipes is elastically fitted with a predetermined frictional force, and is prevented from being pulled out by the frictional force between the pair of pipes, that is, the friction generated between the pair of pipes. The present invention can be configured in various modified forms without departing from the gist, for example, the 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.

FIG. 6 is a diagram showing still another embodiment of the present invention.

FIG. 7 is a view showing the pair of tubes shown in FIG. 6 connected to each other.

FIG. 8 is a view showing still another embodiment of the present invention.

FIG. 9 is a view showing still another embodiment of the present invention.

FIG. 10 is a view showing still another embodiment of the present invention.

FIG. 11 is a view showing still another embodiment of the present invention.

FIG. 12 is a diagram showing still another embodiment of the present invention.

FIG. 13 is a view showing the pair of tubes of FIG. 12 connected to each other.

FIG. 14 is a view showing still another embodiment of the present invention.

FIG. 15 is a diagram showing the pair of tubes of FIG. 14 connected to each other.

FIG. 16 is a view showing still another embodiment of the present invention.

FIG. 17 is a view showing the pair of tubes of FIG. 16 connected to each other.

FIG. 18 is a view showing still another embodiment of the present invention.

FIG. 19 is a view showing the pair of tubes of FIG. 18 connected to each other.

FIG. 20 is a view showing a conventional pipe connection structure.

FIG. 21 is a view showing another conventional pipe connection structure different from FIG. 20;

[Explanation of symbols]

 10, 12 Tube 22, 32, 78 Flange 24, 72 Female thread 26, 86 Concave fitting surface 28, 36, 62 Contact sealing surface 30, 58 Seal member 35, 82 Convex fitting surface 37 Elastic clip (clamp) 38) Opening for fitting 40 Engagement groove 50, 64 Male thread 52, 70 Cap nut 74 Cylindrical member 80 Stepped portion

 ──────────────────────────────────────────────────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 Koiehonmachi, Tokoname-shi, Aichi F-term (reference) in Inax Co., Ltd. 3H013 JC05 3J106 AB01 BA01 BB01 BC04 BC06 BD01 BD03 BE40 CA03 EA03 EB08 EC01 EC07 ED36 ED39 EE02 EF04

Claims (10)

[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)
A concave or convex fitting surface that fits in the tube axis direction with the convex or concave fitting surface on the other tube side, and (c) a tube via a sealing member with respect to the contact sealing surface on the other tube side. Abut in the axial direction,
And a contact sealing surface for sealing the space between the pair of pipes in a watertight manner, and a stopper means for preventing the pair of pipes from coming off in the pipe axis direction in a connected state. . 2. A tube connection structure according to claim 1, wherein said one tube side has both a male screw portion and a female screw portion. 3. The device according to claim 1, wherein the stopper is provided on the one tube and the other tube, and has an engaging portion to be engaged directly or via another member. A pipe connection structure, characterized in that: 4. A clamp member according to claim 3, wherein said engaging portion comprises a flange-like portion projecting outward in a direction perpendicular to the tube axis, and wherein said retaining means clamps said engaging portion in the tube axis direction. A pipe connection structure comprising: 5. The cap according to claim 4, wherein a cap nut having the female screw portion on the inner peripheral surface is provided on the one tubular body side, and the engaging portion is provided on the outer peripheral surface of the tubular body on the one tubular body side. 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. A tubular body connection structure, wherein a stopper portion is formed to abut against a flange portion of the cap nut in a direction perpendicular to the pipe axis and to prevent the flange portion from coming off. 6. A tube connection structure according to claim 5, wherein said stopper portion is also used as said engagement portion according to claim 4. 7. The tube connection structure according to claim 5, wherein the concave fitting surface is formed on an inner peripheral surface of the tube body on the one tube side. 8. A bag-like bag according to claim 4, wherein said one tubular body has said engaging portion at one end with respect to an outer circumferential surface of a tubular body, and said concave fitting surface is formed on an inner circumferential surface. And the connecting position where the one end side protrudes in the pipe axis direction by a predetermined length from the pipe main body, and the male screw portion or female screw portion on the other tube side is connected to the female screw portion or male screw portion on the one tube side. A pipe connection structure characterized in that the pipe connection structure is fitted externally so as to be relatively movable in the pipe axis direction between a retracted position in which the screw is pulled in a direction opposite to a position where it can be screwed. 9. The method according to claim 8, wherein a male screw portion is formed at an end of the tube main body on the one tube body side, and the male screw portion is exposed to the outside at a retracted position of the tubular member. A pipe connection structure characterized by the following. 10. The clamp member according to claim 4, wherein the clamp member is formed by bending a band-shaped leaf spring material into a substantially ring shape, and is fitted at a predetermined position in a circumferential direction. An engagement groove extending along the circumferential direction, which has an opening and can be engaged in a state where the flange-shaped portion on the one tubular body side and the mating flange-shaped portion on the other tubular body side are fitted together at the middle portion in the width direction. A pipe connection structure comprising: