WO2022202118A1

WO2022202118A1 - Pipe joint

Info

Publication number: WO2022202118A1
Application number: PCT/JP2022/008179
Authority: WO
Inventors: 貴俊植松
Original assignee: 日東工器株式会社
Priority date: 2021-03-26
Filing date: 2022-02-28
Publication date: 2022-09-29
Also published as: JPWO2022202118A1

Abstract

[Problem] To provide a pipe joint in which bending between two coupled joint members is suppressed when a force that mutually bends the two joint members is applied. [Solution] A female-type joint body 20 of a female-type joint member 10 includes an inner tube part 34 and an outer tube part 36, which forms, together with the inner tube part 34, a ring-like space 38 that is open to the front side. A male-type joint member 12 includes a sleeve 52 disposed on an outer circumferential surface 50a of a male-type joint body 50. The sleeve 52 includes an inclined outer circumferential surface 70a and an inclined inner circumferential surface 70b. When the pipe joint 1 is subjected to a force that mutually bends the female-type joint member 10 and the male-type joint member 12 in a coupled state with respect to the longitudinal axis L, the inclined outer circumferential surface 70a of the sleeve 52 is pressed against the outer tube part 36, and the inclined inner circumferential surface 70b is pressed against the inner tube part 34. As a result, mutual bending of the female-type joint member 10 and the male-type joint member 12 is prevented.

Description

pipe joint

The present invention relates to a pipe joint consisting of two joint members that are detachably connected to each other.

For example, a pipe joint consisting of a female joint member and a male joint member is normally locked together in the direction of the longitudinal axis by a locking piece or the like with the tip of the male joint member inserted into the passage of the female joint member. It is designed to be connected by being fixed to. (Patent document 1)

JP 2019-132303 A

In the pipe joint described above, the inclination between the joint members is suppressed to some extent mainly by the radial engagement between the inner peripheral surface of the female joint member and the outer peripheral surface of the male joint member. there is If the entire pipe joint is made of a highly rigid metal material, etc., and the inner and outer peripheral surfaces are formed with high precision, the engagement between the inner and outer peripheral surfaces is sufficient to prevent inclination. can be suppressed. However, if the entire pipe joint is made of a resin material with relatively low rigidity or if it is not manufactured with such high precision, depending on the cost and intended use, bending stress acts between the joint members. Sometimes large tilts and bends occur between the joint members. If such a large inclination or bend occurs, there is a risk that the sealing performance between the joint members will deteriorate or the joint members will be damaged.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a pipe joint capable of suppressing bending between two joint members that are mutually connected when a force acts on the two joint members so as to bend each other. intended to

That is, the present invention
A pipe joint comprising first and second joint members detachably connected to each other,
The first joint member
A first coupling body defining a first passageway extending rearwardly from a front end opening, an inner tubular portion defining a forward portion of the first passageway, and a first fitting body positioned radially outwardly spaced from the inner tubular portion. A first joint body having an outer cylindrical portion that forms an annular space that opens forward between itself and the inner cylindrical portion;
with
The second joint member
a second joint body defining a second passageway extending rearwardly from the front end opening;
A tubular sleeve disposed on the outer peripheral surface of the second joint body so as to be displaceable in the direction of the longitudinal axis of the second joint body, the sleeve being inclined radially outward toward the rear of the second joint body. and an inclined inner peripheral surface inclined radially inward toward the rear of the second joint body;
a spring disposed between the second joint body and the sleeve to urge the sleeve forward;
and
When the front portion of the first joint body and the front portion of the second joint body are fitted together to connect the first joint member and the second joint member, the spring biases the spring. The distal end portion of the sleeve is inserted into the annular space and engaged with the first joint body. When a force is applied to the pipe joint such that it is bent toward the outside, the inclined outer peripheral surface of the sleeve is pressed against the outer tubular portion and the inclined inner peripheral surface is pressed against the inner tubular portion to form the first To provide a pipe joint in which mutual bending of a first joint member and the second joint member is prevented.

In the pipe joint, when a force is applied to bend the first joint member and the second joint member in the connected state, the inclined outer peripheral surface and the inclined inner peripheral surface of the sleeve are formed into the outer cylindrical portion and the inclined inner peripheral surface, respectively. Being pressed against the inner tubular portion, the sleeve can engage the first joint body in more locations to resist bending. This makes it possible to more effectively prevent the first joint member and the second joint member from being mutually bent in the connected state.

Further, when a force is applied to the pipe joint to bend the first joint member and the second joint member relative to the longitudinal axis in the connected state, the inclined outer peripheral surface of the outer cylinder The inner corners of the front end of the tubular portion may be in line contact and pressed against the inner corners of the front end of the tubular portion, and the inclined inner peripheral surface may be in line contact and pressed against the outer corners of the front end of the inner cylindrical portion.

For example, if the sleeve is made of a relatively soft material such as resin, when the inclined outer peripheral surface and the inclined inner peripheral surface of the sleeve are in line contact with each corner and pressed more strongly, each corner may portion bites into the inclined outer peripheral surface and the inclined inner peripheral surface. This makes it difficult for the sleeve to slip with respect to the first joint body, making it possible to more effectively suppress bending.

again,
The first joint member further comprises a lock piece holding hole formed in the inner cylindrical portion, and a lock piece held in the lock piece holding hole so as to be displaceable in the radial direction of the first joint body. prepared,
The second joint member further comprises an annular locking groove extending circumferentially on the outer peripheral surface of the second joint body,
In the connected state, the sleeve presses the lock member from the radially outer side so that the lock member can be maintained in a state of being engaged with the annular locking groove.

Further, the first joint body has an inner joint body that constitutes the inner cylindrical portion and an outer joint body that constitutes the outer cylindrical portion, and the inner joint body and the outer joint body are It can be fixed to each other by a snap fit.

An embodiment of a pipe joint according to the present invention will be described below with reference to the accompanying drawings.

1 is a cross-sectional view of a pipe joint in an unconnected state according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view of the pipe joint of FIG. 1 in a connected state;

As shown in FIGS. 1 and 2, a pipe joint 1 according to one embodiment of the present invention includes a female joint member (first joint member) 10 and a male joint member (second joint member) that are detachably connected to each other. joint member) 12.

The female joint member 10 has a female joint body (first joint body) defining a female side passage (first passage) 18 extending rearward (to the left in the drawing) from the front end opening 14 to the rear end opening 16. 20 and a valve member 22 disposed within the female passageway 18 . The female fitting body 20 includes an outer joint body 24 , an inner joint body 26 mounted inside the outer joint body 24 , and a longitudinal joint body 26 between the outer joint body 24 and the inner joint body 26 inside the outer joint body 24 . and a central joint body 28 sandwiched and fixed in the direction of the axis L. An inner joint body 26 defines a forward portion of the female passageway 18 , a central joint body 28 defines a central portion of the female passageway 18 , and an outer joint body 24 defines a rearward portion of the female passageway 18 . A locking hole 30 is formed in the outer joint body 24, and a locking projection 32 is formed in the inner joint body 26. The locking hole 30 and the locking projection 32 are snap-fitted together to form the outer joint body 24. The inner joint main body 26 is fixed to each other. The female joint body 20 includes an inner tubular portion 34 that is part of the inner joint body 26 and an outer tubular portion that is part of the outer joint body 24 and is positioned radially outwardly away from the inner tubular portion 34 . 36. The inner tubular portion 34 and the outer tubular portion 36 form an annular space 38 that opens forward. A lock piece holding hole 40 is formed through the inner tubular portion 34 in the radial direction, and a lock piece 42 is held in the lock piece holding hole 40 so as to be radially displaceable. In addition, in this embodiment, the inner joint main body 26, the outer joint main body 24, and the central joint main body 28 of the female joint main body 20 are formed of a resin material.

The male joint member 12 has a male joint body (second joint body) defining a male side passage (second passage) 48 extending rearward (to the right in the drawing) from the front end opening 44 to the rear end opening 46 . 50, a cylindrical sleeve 52 disposed displaceably on the outer peripheral surface 50a of the male joint body 50 in the direction of the longitudinal axis L of the male joint body 50, and between the male joint body 50 and the sleeve 52. and a spring 54 disposed on the sleeve 52 to bias the sleeve 52 forward. The male fitting body 50 consists of a front fitting body 56, a rear fitting body 58, and a center fitting body 60 held therebetween. A locking projection 62 is formed in the front joint body 56, and a locking hole 64 is formed in the rear joint body 58. By snap-fitting the locking projection 62 and the locking hole 64, the front joint body 56 and the locking hole 64 are formed. The rear joint main body 58 is fixed to each other. Male fitting member 12 further includes a valve member 66 disposed within male passageway 48 . An annular locking groove 68 extending in the circumferential direction is formed on the outer peripheral surface 50 a of the male joint body 50 . A side surface on the front side of the annular locking groove 68 is an arc-shaped surface corresponding to the spherical locking element 42 . The sleeve 52 has a front end portion 70 projecting forward at a position radially spaced apart from the outer peripheral surface 50 a of the male joint body 50 . A distal end portion 70 of the sleeve 52 is formed with an inclined outer peripheral surface 70a inclined radially outward toward the rear and an inclined inner peripheral surface 70b inclined radially inward toward the rear. In addition, in this embodiment, the male joint body 50 and the sleeve 52 are made of a resin material.

By inserting the front portion of the male joint body 50 into the front portion of the female joint body 20 and fitting them together, the female joint member 10 and the male joint member 12 are connected as shown in FIG. be. Specifically, when the male joint body 50 is inserted into the female side passage 18 of the female joint body 20 from the front end opening 14 thereof, the locking element 42 and the annular engaging groove 68 are radially aligned. In this position, the tip portion 70 of the sleeve 52 biased by the spring 54 presses the locking piece 42 from the radially outer side, and the locking piece 42 is maintained in a state of being engaged with the annular locking groove 68 . By engaging the lock piece 42 with the annular locking groove 68 in this way, the state in which the female joint member 10 and the male joint member 12 are connected is maintained. In this connected state, the valve member 22 of the female joint body 20 and the valve member 66 of the male joint member 12 contact each other in the direction of the longitudinal axis L and are displaced rearward. and the male side passage 48 are opened and communicated with each other.

In the connected state, the tip portion 70 of the sleeve 52 is inserted into the annular space 38 of the female joint body 20 and engaged with the male joint member 12 . At this time, in this embodiment, the inclined outer peripheral surface 70a of the sleeve 52 is in line contact with the inner corner portion 72 at the front end of the outer tubular portion 36, and the inclined inner peripheral surface 70b is in line contact with the outer corner portion at the front end of the inner tubular portion 34. 74 are positioned close to each other without contact. However, as described above, the outer joint main body 24 forming the outer tubular portion 36 and the inner joint main body 26 forming the inner tubular portion 34 are formed as separate members, and are fixed to each other by snap fitting. Therefore, there is some rattling between the outer joint body 24 and the inner joint body 26, which may cause the inclined inner peripheral surface 70b of the sleeve 52 to come into contact with the outer corner portion 74 of the inner cylindrical portion 34. obtain. In another embodiment, the angled inner peripheral surface 70b of the sleeve 52 makes line contact with the outer corner 74 of the inner tubular portion 34 and the angled outer peripheral surface 70a does not contact the inner corner 72 of the outer tubular portion 36. can also be positioned close to .

In the connected state as described above, when a force acts on the pipe joint 1 to bend the female joint member 10 and the male joint member 12 with respect to the longitudinal axis L, the inclined outer peripheral surface 70a of the sleeve 52 It presses against the inner corner 72 of the outer tubular portion 36, and the inclined inner peripheral surface 70b of the sleeve 52 comes into contact with and presses against the outer corner 74 of the inner tubular portion 34. As shown in FIG. For example, when the position of the female joint member 10 is fixed, if a force is applied to the male joint member 12 so as to bend the male joint member 12 in the clockwise direction centering on the position near the lock 42, In the lower position of the sleeve 52 as seen in the drawing, the distal end portion 70 is displaced in the lower left direction so that the inclined outer peripheral surface 70a is further pressed against the inner corner portion 72 of the outer cylindrical portion 36, and the upper position as seen in the drawing. Then, the tip portion 70 is displaced in the lower right direction so that the inclined inner peripheral surface 70b is in line contact with the outer corner portion 74 of the inner cylindrical portion 34 and pressed. If a force is applied to the male joint member 12 to bend it counterclockwise, the distal end portion 70 of the sleeve 52 is displaced upward and to the right at the lower position of the sleeve 52 as seen in the drawing, and the inclined inner peripheral surface 70b is formed. is pressed against the outer corner portion 74 of the inner cylindrical portion 34 in line contact with the outer corner portion 74 of the inner cylindrical portion 34, and at the upper position in the drawing, the tip portion 70 is displaced in the upper left direction so that the inclined outer peripheral surface 70a contacts the inner corner portion of the outer cylindrical portion 36. The portion 72 can be pressed more strongly. At which positions in the circumferential direction the inclined outer peripheral surface 70a and the inclined inner peripheral surface 70b are pressed against the outer cylindrical portion 36 and the inner cylindrical portion 34, respectively, depends on the female joint member 10 and the male joint member 12. It differs depending on what kind of bending direction force acts on it. In this embodiment, the female joint member 10 and the male joint member 12 are made of a resin material as a whole. 36 and the outer corner portion 74 of the inner tubular portion 34 are in line contact with each other and strongly pressed, the inner corner portion 72 and the outer corner portion 74 are formed on the inclined outer peripheral surface 70a and the inclined inner peripheral surface 70b, respectively. slightly bites into This makes it difficult for the sleeve 52 to slip relative to the female joint body 20, so that bending can be suppressed more effectively.

As described above, in the pipe joint 1, when a force acts to mutually bend the female joint member 10 and the male joint member 12 with respect to the longitudinal axis L, the inclined outer peripheral surface 70a of the sleeve 52 It presses against the outer tubular portion 36 and the inclined inner peripheral surface 70 b of the sleeve 52 presses against the inner tubular portion 34 . Since both the inclined outer peripheral surface 70a and the inclined inner peripheral surface 70b of the sleeve 52 are compressed, the sleeve 52 can engage the female coupling body 20 at more positions to resist bending forces. This makes it possible to more effectively prevent the female joint member 10 and the male joint member 12 from being mutually bent in the connected state. In particular, when each joint member is made of a resin material, which is generally less rigid than a metal material, and is composed of a plurality of parts, it tends to bend relatively greatly when a force is applied in the connected state. By adopting the above-described configuration of the present invention, it is possible to prevent deterioration of the sealing performance between the two joint members and breakage of each joint member due to large bending.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, a sleeve may be provided on the female coupling member and an inner tubular portion and an outer tubular portion defining an annular space may be provided on the male coupling member. Further, the female joint main body and the male joint member may be configured as an integral member, or may be made of, for example, a metal material other than resin.

1 Pipe joint 10 Female joint member (first joint member)
12 male joint member (second joint member)
14 front end opening 16 rear end opening 18 female side passage (first passage)
20 female joint body (first joint body)
22 Valve member 24 Outer joint main body 26 Inner joint main body 28 Central joint main body 30 Locking hole 32 Locking projection 34 Inner cylindrical portion 36 Outer cylindrical portion 38 Annular space 40 Locking piece holding hole 42 Locking piece 44 Front end opening 46 Rear end Opening 48 male side passage (second passage)
50 male joint body (second joint body)
50a outer peripheral surface 52 sleeve 54 spring 56 front joint main body 58 rear joint main body 60 central joint main body 62 locking protrusion 64 locking hole 66 valve member 68 annular locking groove 70 tip portion 70a inclined outer peripheral surface 70b inclined inner peripheral surface 72 inner corner Part 74 Outer Corner L Longitudinal Axis

Claims

A pipe joint comprising first and second joint members detachably connected to each other,
The first joint member
A first coupling body defining a first passageway extending rearwardly from a front end opening, an inner tubular portion defining a forward portion of the first passageway, and a first fitting body positioned radially outwardly spaced from the inner tubular portion. A first joint body having an outer cylindrical portion that forms an annular space that opens forward between itself and the inner cylindrical portion;
with
The second joint member
a second joint body defining a second passageway extending rearwardly from the front end opening;
A cylindrical sleeve disposed on the outer peripheral surface of the second joint body so as to be displaceable in the direction of the longitudinal axis of the second joint body, the sleeve being inclined radially outward toward the rear of the second joint body. and an inclined inner peripheral surface inclined radially inward toward the rear of the second joint body;
a spring disposed between the second joint body and the sleeve to urge the sleeve forward;
and
When the front portion of the first joint body and the front portion of the second joint body are fitted together to connect the first joint member and the second joint member, the spring biases the spring. Then, the tip portion of the sleeve is inserted into the annular space and engaged with the first joint body, and in the connected state, the first joint member and the second joint member are mutually aligned with respect to the longitudinal axis. When a force is applied to the pipe joint such that it is bent inward, the inclined outer peripheral surface of the sleeve is pressed against the outer tubular portion and the inclined inner peripheral surface is pressed against the inner tubular portion to form the first A pipe joint in which mutual bending of a first joint member and the second joint member is prevented.
When a force acts on the pipe joint such that the first joint member and the second joint member are mutually bent with respect to the longitudinal axis in the connected state, the inclined outer peripheral surface is inclined toward the outer cylindrical portion. 2. A tube according to claim 1, wherein said inclined inner peripheral surface bears in line contact with an inner corner of the forward end of said inner tubular portion, and wherein said inclined inner peripheral surface bears in line contact with said outer corner of said inner tubular portion. fittings.
The first joint member further comprises a lock piece holding hole formed in the inner cylindrical portion, and a lock piece held in the lock piece holding hole so as to be displaceable in the radial direction of the first joint body. prepared,
The second joint member further comprises an annular locking groove extending circumferentially on the outer peripheral surface of the second joint body,
3. The pipe joint according to claim 1 or 2, wherein in said connected state, said sleeve presses said lock element from the radially outer side so that said lock element maintains a state of engagement with said annular locking groove. .
The first joint body has an inner joint body that constitutes the inner cylindrical portion and an outer joint body that constitutes the outer cylindrical portion, and the inner joint body and the outer joint body are snap-fitted together. 4. A pipe joint as claimed in any one of claims 1 to 3, adapted to be mutually fixed by a.