JP7017441B2 - Pipe fittings - Google Patents

Description

The present invention relates to a pipe joint for connecting a pipe member having a flange portion.

Normally, pipes used in sanitary pipes in manufacturing plants in the food field have flanges called ferrules at the ends, and when connecting pipes to each other for piping, the ferrules between the pipes are put together with packing. While the state is sandwiched and butted, both clamp members are tightened by surrounding the circumference with a ferrule clamp composed of two semicircular clamping members (Patent Document 1). When performing the connecting work using such a ferrule clamp, the clamp must be tightened while the two pipes to be connected are aligned and the ferrule at the end is held with the packing sandwiched. Such work may be difficult to perform by only one worker. If the ferrule tube is long and heavy, the connection work becomes even more difficult.

In order to eliminate the complexity of using such a ferrule clamp, a pipe joint for a ferrule pipe has been developed so that a connecting action can be performed more easily (Patent Document 2). This pipe joint is provided with a joint body that accepts the flange portion of the ferrule pipe and a fixing lever that is pivotally attached to the joint body, and is for fixing while the flange portion is received inside the joint body. By pivotally operating the lever, the flange portion is pressed by the curved pressing surface of the fixing lever to further pull the ferrule pipe into the joint body, and the joint body is sealed and engaged with the ferrule pipe. Such pipe fittings are connected and disconnected relatively frequently, such as by periodically disconnecting the ferrule pipe for cleaning the pipe or temporarily connecting it to the ferrule pipe for testing. It is especially effective for.

Japanese Unexamined Patent Publication No. 2009-115167 JP-A-2015-102103

However, in the above-mentioned conventional pipe joint, the pressing surface of the fixing lever rubs against the flange portion while being pressed against the flange portion of the ferrule pipe. Therefore, for example, the pressing surface of the fixing lever and the ferrule When a foreign substance is caught between the flange of the pipe, or when the fixing lever is operated with the ferrule pipe inserted diagonally into the joint body, an excessive force acts on the flange. , There is a risk that the flange will be scratched.

Therefore, in view of the above problems of conventional pipe joints, it is an object of the present invention to provide a pipe joint in which the flange portion of a pipe member such as a ferrule pipe is not easily scratched.

That is, the present invention
A pipe joint for connecting a pipe member having a flange portion having a front end side surface and a rear end side surface, which is expanded radially outward at the tip portion.
A pipe joint body that defines a passage extending rearward from the front end opening that receives the flange portion of the pipe member, and
A flow path member that is displaceably arranged with respect to the pipe joint body in the direction of the longitudinal axis of the pipe joint body in the passage and defines a flow path extending in the direction of the longitudinal axis.
It is held displaceably in the pipe joint body in the radial direction, protrudes radially inward from the inner peripheral surface of the pipe joint body, and engages with the rear end side surface of the flange portion of the pipe member received in the passage. A lock that can be displaced between the lock position that locks the tube member in the passage and the lock release position that is located radially outside the lock position and unlocks the tube member. With a child
A holding position that is arranged on the outer peripheral surface of the pipe joint body and engages with the locker from the outside in the radial direction to hold the locker at the lock position, and the locker is displaced to the lock release position. With a sleeve that is displaceable between the release position and which allows
It is a connecting mechanism for relatively displaced the pipe joint body and the flow path member in the direction of the longitudinal axis, and is displaceable between the connecting position and the disconnecting position, and the locker is the locker. When the pipe member is displaced from the disengagement position to the connection position while being locked in the passage, the flow path member is displaced forward relative to the pipe joint body. A connecting mechanism in which the flow path member is hermetically engaged with the front end side surface of the flange portion of the pipe member.
Provide a pipe fitting having.

In the pipe joint, by setting the connecting mechanism to the connecting position while the pipe member is locked in the passage by the locker, the flow path member is displaced forward by the connecting mechanism to form the flange portion of the pipe member. It is designed to be hermetically engaged with the side surface of the tip. That is, when connecting the pipe member to the pipe joint, there is no operation of rubbing the flange portion of the pipe member in a state where a large force is applied, so that it is possible to prevent the flange portion of the pipe member from being damaged by the connecting work. It becomes.

Specifically, the connecting mechanism seems to be a lever attached to one of the pipe joint main body and the flow path member so as to be pivotable between the connecting position and the disconnecting position. Can be.

In this case further
The lever has a pivot portion pivotally attached to the pipe joint body and an arcuate engaging protrusion formed around the pivot portion.
The flow path member has a curved engaging recess, and the flow path member has a curved engaging recess.
When the lever is pivotally moved from the disengagement position to the connection position, the engaging protrusion may engage with the engagement recess and press the flow path member forward.

By using such a lever as the connecting mechanism, it is possible to reduce the force required for the connecting operation.

Furthermore, when the lever is in the disengagement position, the sleeve is allowed to be displaced to the release position, and when it is in the connection position, it interferes with the sleeve and the sleeve is displaced to the release position. You can try to prevent it from doing so.

With such a configuration, it is possible to prevent the sleeve from being accidentally displaced to the release position and being disconnected when the pipe members are connected.

Preferably,
The flange portion of the pipe member has an annular recess facing the tip end side of the pipe member.
An annular elastic seal member that is pressed against the front end side surface of the flange portion and compressed in the direction of the longitudinal axis when the flow path member is hermetically engaged with the pipe member, and an outer circumference of the elastic seal member. It has a front tubular portion provided to cover the surface and has a front tubular portion.
When the flow path member is hermetically engaged with the tube member, the tip of the front tubular portion can project forward of the elastic seal member and be received by the annular recess.

With such a configuration, the entire outer peripheral surface of the elastic seal member is covered by the front tubular portion in the sealed engagement state with the pipe member, and the elastic seal member can be prevented from being deformed radially outward. .. Thereby, the state of the sealed engagement between the elastic sealing member and the front end side surface of the flange portion can be stabilized. For example, when a high pressure is applied to the inside of the pipe member, the elastic sealing member is deformed radially outward to prevent the internal fluid from leaking. In addition, it is possible to prevent the elastic sealing member from being excessively deformed to the outside and damaged.

Preferably,
A front position that is arranged in the passage of the pipe joint body and engages with the locker from the inside in the radial direction to hold the locker in the lock release position, and the locker is displaced to the lock position. A holding member that is displaceable in the direction of the longitudinal axis to and from a rear position that allows
A spring arranged between the holding member and the flow path member and urging the holding member forward with respect to the flow path member.
Can be further prepared.

Further, when the pipe member is inserted into the passage, the holding member is pushed by the pipe member and displaced from the front position to the rear position so that the locker becomes the lock position and the locker is in the locked position. The sleeve is in the holding position, and the urging force of the spring allows the holding member to push the flange portion of the tube member forward and press it against the locker.

With such a configuration, the pipe member can be in a temporarily connected state held by the locker and the holding member simply by inserting the pipe member into the passage, and the connecting operation can be simplified. ..

Specifically, the rear end side surface of the pipe member has an inclined surface inclined inward in the radial direction toward the rear end side of the pipe member, and the locker is inclined at substantially the same angle as the inclined surface. It has a locking surface facing rearward, and the tubular member can be locked in the passage by engaging the locking surface of the locker with the inclined surface. ..

With such a configuration, the side surface of the rear end of the tube member and the locker can be engaged with each other in a wider area, and the locker can hold the flange portion in a more stable state. ..

Hereinafter, embodiments of the pipe joint according to the present invention will be described with reference to the accompanying drawings.

It is a side sectional view in the unconnected state of the pipe fitting which concerns on one Embodiment of this invention. It is a figure which shows the state in the middle of connection of the pipe joint of FIG. It is a figure which shows the temporary connection state of the pipe joint of FIG. It is a figure which shows the connection state of the pipe joint of FIG.

As shown in FIGS. 1 to 4, in the pipe joint 10 according to the embodiment of the present invention, a ferrule pipe (pipe member) 1 having a flange portion 3 having a diameter expanded outward in the radial direction at the tip portion 2 can be attached and detached. It is designed to be connected. As shown in FIG. 1, the pipe joint 10 is formed in a tubular pipe joint body 16 having a passage 14 extending rearward (to the left in the figure) from the front end opening 12 and in the passage 14 of the pipe joint body 16. The arranged flow path member 18, the locker 20 held by the pipe joint body 16, the sleeve 22 arranged on the outer peripheral surface 16a of the pipe joint body 16, and the lever (connection) attached to the pipe joint body 16. Mechanism) 24 and. The pipe joint 10 is further arranged in the passage 14 of the pipe joint main body 16 and is arranged between the holding member 26 that supports the locker 20 from the inside in the radial direction, and between the holding member 26 and the flow path member 18, and is a holding member. A spring 28 for urging the 26 to the front (to the right in the figure) with respect to the flow path member 18 is provided.

The flow path member 18 has a flow path 30 extending in the direction of the longitudinal axis L of the pipe joint body 16, and can be displaced with respect to the pipe joint body 16 in the direction of the longitudinal axis L in the passage 14 of the pipe joint body 16. Have been placed. The flow path member 18 further has an annular elastic sealing member 34 attached to the front end portion 32 thereof, and a front tubular portion 36 arranged so as to cover the entire outer peripheral surface 34a of the elastic sealing member 34. The elastic seal member 34 has a protrusion 38 protruding outward in the radial direction, and the protrusion 38 is fixed by fitting the protrusion 38 into a mounting groove 40 formed in the front cylindrical portion 36.

The locker 20 is held in the locker holding hole 42 formed in the pipe joint body 16, and is located outside the passage 14 of the pipe joint body 16 at an unlocked position (FIGS. 1 and 2) and the pipe joint body 16. It is possible to displace in the radial direction from the locking position (FIGS. 3 and 4) protruding inward in the radial direction from the inner peripheral surface 16b of the above. The sleeve 22 has a release position (FIGS. 1 and 2) that allows the locker 20 to be displaced to the unlocked position, and a locker that is displaced forward from the release position and engages with the locker 20 from the outside in the radial direction. It can be displaced in the direction of the longitudinal axis L from the holding position (FIGS. 3 and 4) for holding 20 in the locked position. Further, the sleeve 22 is urged forward toward the holding position by a spring 43 arranged between the sleeve 22 and the pipe joint main body 16. The holding member 26 engages with the locker 20 from the inside in the radial direction to hold the locker 20 in the unlocked position (FIG. 1), and is displaced rearward from the front position to move the locker 20 to the lock position. It is possible to displace in the direction of the longitudinal axis L from the rear position (FIGS. 3 and 4) that allows displacement. The locker 20 is held in the unlocked position or the locked position by the sleeve 22 and the holding member 26.

The lever 24 includes a pivot portion 44 pivotally attached to the pipe joint body 16, an arc-shaped engaging convex portion 46 formed around the pivot portion 44, and an operation shaft portion 48 extending in the radial direction of the pivot portion 44. Has. An operation ring 50 is attached to the tip end portion 48a of the operation shaft portion 48. Further, on the outer peripheral surface 18a of the flow path member 18, an engaging recess 52 curved in a shape corresponding to the engaging convex portion 46 of the lever 24 is formed. The lever 24 has a disengagement position (FIGS. 1 to 3) in which the engaging convex portion 46 does not engage with the engaging concave portion 52, and an engaging convex portion by rotating the operation shaft portion 48 forward from the disengaging position. It is pivotable with respect to the pipe joint body 16 with and from the connection position (FIG. 4) where the 46 engages with the engagement recess 52.

When connecting the pipe joint 10 to the ferrule pipe 1, first, in the non-connected state of FIG. 1, the flange portion 3 of the ferrule pipe 1 is inserted into the passage 14 from the front end opening 12 of the pipe joint body 16. Then, the flange portion 3 of the ferrule pipe 1 comes into contact with the holding member 26, and the holding member 26 is displaced rearward against the urging force of the spring 28 (FIG. 2). When the ferrule tube 1 is inserted to a position where the flange portion 3 of the ferrule tube 1 passes through the locker 20, the holding member 26 is in the rear position and the holding member 26 is released from the inside in the radial direction with respect to the locker 20. The locker 20 can be displaced to the lock position and is pushed by the sleeve 22 to be displaced inward in the radial direction to reach the lock position. At the same time, the sleeve 22 is in the holding position, and the locker 20 is engaged with the sleeve 22 from the outside in the radial direction and held in the locking position (FIG. 3). The locker 20 in the locked position engages with the rear end side surface 4 of the flange portion 3 to lock the ferrule tube 1 into the passage 14. The rear end side surface 4 of the flange portion 3 is an inclined surface inclined inward in the radial direction toward the rear end side (right side in the figure) of the ferrule tube 1, and the locker 20 is abbreviated as this. It has a locking surface 54 that is inclined at the same angle and faces the rear of the pipe joint 10, and has a locking surface 54 of the locker 20 that is inclined at substantially the same angle and a rear end side surface 4 of the flange portion 3. The ferrule tube 1 is locked in the passage 14 by engaging with. At this time, the holding member 26 presses the flange portion 3 of the ferrule tube 1 forward by the urging force of the spring 28 and presses it against the locker 20. As a result, the flange portion 3 is sandwiched and held between the holding member 26 and the locker 20. In this temporarily connected state, there is still a gap between the tip side surface 5 of the flange portion 3 and the elastic sealing member 34 of the flow path member 18, and the ferrule pipe 1 and the flow path member 18 are still hermetically engaged. do not have.

When the lever 24 is pivotally moved from the temporarily connected state of FIG. 3 to the connecting position, the engaging convex portion 46 of the lever 24 slides and engages with the engaging concave portion 52 of the flow path member 18, and the flow path member. 18 is pressed forward and displaced forward relative to the pipe joint body 16. As a result, the elastic sealing member 34 of the flow path member 18 is pressed against the front end side surface 5 of the flange portion 3 and compressed in the direction of the longitudinal axis L, and the flow path member 18 is in a state of being hermetically engaged with the flange portion 3. , The flow path 30 of the flow path member 18 and the flow path 6 of the ferrule tube 1 communicate with each other (FIG. 4). When the elastic seal member 34 is compressed, the tip portion 36a of the front tubular portion 36 is in a state of protruding forward from the elastic seal member 34, and the tip portion 36a is on the tip side surface 5 of the ferrule tube 1. Since it is received by the annular recess 7 formed so as to face the tip of the ferrule tube 1, it does not substantially come into contact with the ferrule tube 1. Since the entire outer peripheral surface 34a of the elastic seal member 34 is covered by the front tubular portion 36 from the state before connection, the front tubular portion 36 and the flange portion 3 are connected when the ferrule pipe 1 is connected. It will not be crushed by being sandwiched between them, and it will not be excessively deformed to the outside in the radial direction. Further, even when pressure is applied to the flow path 30 in the connected state, the elastic seal member 34 is supported from the radially outer side by the front cylindrical portion 36, so that the elastic seal member 34 does not deform radially outward. Therefore, the sealed state can be more reliably maintained even when a high-pressure fluid flows.

In the connected state of FIG. 4, the tip end portion 48a of the operation shaft portion 48 of the lever 24 is located close to the rear end surface 22a of the sleeve 22, and the sleeve 22 is displaced rearward from the holding position toward the release position. At this time, the rear end surface 22a of the sleeve 22 comes into contact with the tip end portion 48a of the lever 24. By causing the lever 24 to interfere with the sleeve 22 in this way, it is possible to prevent the sleeve 22 from being displaced to the release position in the connected state, and to prevent the connection from being unexpectedly released due to an erroneous operation. be able to.

When the connection is released, first, the lever 24 is pivotally moved from the connection state shown in FIG. 4 to the connection release position. Then, the flow path member 18 is displaced rearward by the urging force of the spring 28, the sealed engagement with the flange portion 3 of the ferrule pipe 1 is released, and the temporary connection state of FIG. 3 is obtained. In the temporarily connected state, since the operation shaft portion 48 of the lever 24 is displaced rearward, the sleeve 22 and the lever 24 no longer interfere with each other, so that the sleeve 22 can be displaced to the released position. .. Next, the ferrule pipe 1 is pulled out from the passage 14 of the pipe joint main body 16 with the sleeve 22 displaced to the release position. As a result, the locker 20 is pushed outward in the radial direction by the inclined rear end side surface 4 of the flange portion 3 to reach the lock release position, and the locker 20 is released from the lock on the ferrule tube 1. When the ferrule pipe 1 is detached from the pipe joint 10, the holding member 26 returns to the holding position, and the pipe joint 10 is in the non-connected state shown in FIG.

As described above, in the pipe joint 10, when the flow path member 18 is hermetically engaged with the ferrule tube 1, the flow path member 18 is not directly pressed by the lever 24, but the flow path member 18 is flanged by the ferrule tube 1. Since the pressure is applied toward the portion 3, it is possible to prevent the flange portion 3 from being scratched by the connecting operation.

An operation ring 50 is attached to the tip portion 48a of the operation shaft portion 48 of the lever 24, which is gripped by the operator when the lever 24 is operated between the connection position and the connection disconnection position. The purpose is to facilitate the operation of the lever 24. In particular, when the lever 24 is in the connecting position, the operating shaft portion 48 of the lever 24 is located along the outer peripheral surface 16a of the pipe joint body 16, making it difficult to grip the lever 24, but the lever can be easily gripped by gripping the operating ring 50. 24 operations can be performed. In the embodiment, the operation ring 50 is always rotatable with respect to the operation shaft portion 48, but when the lever 24 is not operated, the operation ring 50 is used for other operation shaft portions 48, sleeves 22 and the like. The operation ring 50 may be out of the way by allowing it to be temporarily fixed to the member.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, even if the lever is pivotally attached to the flow path member and the lever engages with the pipe joint body when the lever is rotated to the connecting position, the flow path member is relatively displaced forward. good. Further, instead of the lever, the flow path member may be configured to be displaced relative to the pipe joint body by another connecting mechanism such as a link mechanism or a handle mechanism. Further, the locking surface of the locker does not necessarily have to be inclined at the same angle as the inclined surface of the flange portion of the ferrule tube, and the diameter is more easily when the flange portion is pulled out, for example, as an inclination of a gentler angle. It may be possible to displace outward in the direction. The locker may have other shapes such as a sphere or a cylinder. Further, the flow path member has a structure in which the elastic sealing member has an annular protrusion protruding forward without having a front tubular portion, so that the protrusion is hermetically engaged with the annular recess of the flange portion in the connected state. You may. At this time, the diameter of the protrusion may be slightly larger or smaller than the diameter of the annular recess so that the protrusion bends in the radial direction when the protrusion is received by the annular recess. By doing so, the sealing property between the protrusion and the annular recess can be further improved. The present invention is not limited to the pipe joint for connecting the ferrule pipe, and may be a pipe joint for connecting another pipe member having a flange portion.

1 Ferrule pipe (pipe member)
2 Tip 3 Flange 4 Rear end side 5 Tip side 6 Flow path 7 Circular recess 10 Pipe fitting 12 Front end opening 14 Passage 16 Pipe joint body 16a Outer peripheral surface 16b Inner peripheral surface 18 Flow path member 18a Outer peripheral surface 20 Locker 22 Sleeve 22a Rear end surface 24 lever (connecting mechanism)
26 Holding member 28 Spring 30 Flow path 32 Front end 34 Elastic sealing member 34a Outer peripheral surface 36 Front tubular part 36a Tip 38 Protrusion 40 Mounting groove 42 Locker holding hole 43 Spring 44 Pivot 46 Engaging convex part 48 Operation Shaft 48a Tip 50 Operation ring 52 Engagement recess 54 Locking surface L Longitudinal axis

Claims (8)

A pipe joint for connecting a pipe member having a flange portion having a front end side surface and a rear end side surface, which is expanded radially outward at the tip portion.
A pipe joint body that defines a passage extending rearward from the front end opening that receives the flange portion of the pipe member, and
A flow path member that is displaceably arranged with respect to the pipe joint body in the direction of the longitudinal axis of the pipe joint body in the passage and defines a flow path extending in the direction of the longitudinal axis.
It is held displaceably in the pipe joint body in the radial direction, protrudes radially inward from the inner peripheral surface of the pipe joint body, and engages with the rear end side surface of the flange portion of the pipe member received in the passage. A lock that can be displaced between the lock position that locks the tube member in the passage and the lock release position that is located radially outside the lock position and unlocks the tube member. With a child
A holding position that is arranged on the outer peripheral surface of the pipe joint body and engages with the locker from the outside in the radial direction to hold the locker at the lock position, and the locker is displaced to the lock release position. With a sleeve that is displaceable between the release position and which allows
It is a connecting mechanism for relatively displaced the pipe joint body and the flow path member in the direction of the longitudinal axis, and is displaceable between the connecting position and the disconnecting position, and the locker is the locker. When the pipe member is displaced from the disengagement position to the connection position while being locked in the passage, the flow path member is displaced forward relative to the pipe joint body. A connecting mechanism in which the flow path member is hermetically engaged with the front end side surface of the flange portion of the pipe member.
Have,
A pipe joint in which the connection mechanism is attached to one of the pipe joint body and the flow path member so as to be pivotable between the connection position and the connection disconnection position . A pipe joint for connecting a pipe member having a flange portion having a front end side surface and a rear end side surface, which is expanded radially outward at the tip portion.
A pipe joint body that defines a passage extending rearward from the front end opening that receives the flange portion of the pipe member, and
A flow path member that is displaceably arranged with respect to the pipe joint body in the direction of the longitudinal axis of the pipe joint body in the passage and defines a flow path extending in the direction of the longitudinal axis.
It is held displaceably in the pipe joint body in the radial direction, protrudes radially inward from the inner peripheral surface of the pipe joint body, and engages with the rear end side surface of the flange portion of the pipe member received in the passage. A lock that can be displaced between the lock position that locks the tube member in the passage and the lock release position that is located radially outside the lock position and unlocks the tube member. With a child
A holding position that is arranged on the outer peripheral surface of the pipe joint body and engages with the locker from the outside in the radial direction to hold the locker at the lock position, and the locker is displaced to the lock release position. With a sleeve that is displaceable between the release position and which allows
It is a connecting mechanism for relatively displaced the pipe joint body and the flow path member in the direction of the longitudinal axis, and is displaceable between the connecting position and the disconnecting position, and the locker is the locker. When the pipe member is displaced from the disengagement position to the connection position while being locked in the passage, the flow path member is displaced forward relative to the pipe joint body. A connecting mechanism in which the flow path member is hermetically engaged with the front end side surface of the flange portion of the pipe member.
A front position that is arranged in the passage of the pipe joint body and engages with the locker from the inside in the radial direction to hold the locker in the lock release position, and the locker is displaced to the lock position. A holding member that is displaceable in the direction of the longitudinal axis to and from a rear position that allows
A spring arranged between the holding member and the flow path member and urging the holding member forward with respect to the flow path member.
With pipe fittings. When the tube member is inserted into the passage, the holding member is pushed by the tube member and displaced from the front position to the rear position so that the locker becomes the lock position and the sleeve becomes the lock. The pipe joint according to claim 2, wherein the holding position is reached, and the holding member presses the flange portion of the pipe member forward and presses against the locker by the urging force of the spring. A pipe joint for connecting a pipe member having a flange portion having a front end side surface and a rear end side surface, which is expanded radially outward at the tip portion.
A pipe joint body that defines a passage extending rearward from the front end opening that receives the flange portion of the pipe member, and
A flow path member that is displaceably arranged with respect to the pipe joint body in the direction of the longitudinal axis of the pipe joint body in the passage and defines a flow path extending in the direction of the longitudinal axis.
It is held displaceably in the pipe joint body in the radial direction, protrudes radially inward from the inner peripheral surface of the pipe joint body, and engages with the rear end side surface of the flange portion of the pipe member received in the passage. A lock that can be displaced between the lock position that locks the tube member in the passage and the lock release position that is located radially outside the lock position and unlocks the tube member. With a child
A holding position that is arranged on the outer peripheral surface of the pipe joint body and engages with the locker from the outside in the radial direction to hold the locker at the lock position, and the locker is displaced to the lock release position. With a sleeve that is displaceable between the release position and which allows
It is a connecting mechanism for relatively displaced the pipe joint body and the flow path member in the direction of the longitudinal axis, and is displaceable between the connecting position and the disconnecting position, and the locker is the locker. When the pipe member is displaced from the disengagement position to the connection position while being locked in the passage, the flow path member is displaced forward relative to the pipe joint body. A connecting mechanism in which the flow path member is hermetically engaged with the front end side surface of the flange portion of the pipe member.
Have,
The rear end side surface of the pipe member has an inclined surface inclined inward in the radial direction toward the rear end side of the pipe member, and the locker is inclined at substantially the same angle as the inclined surface and faces rearward. A pipe fitting having a locking surface, wherein the locking surface of the locker engages the inclined surface so that the pipe member is locked in the passage. Claims 2 to 4 , wherein the connecting mechanism is a lever attached to one of the pipe joint body and the flow path member so as to be pivotable between the connecting position and the disconnecting position. The pipe fitting according to any one of the above. The lever has a pivot portion pivotally attached to the pipe joint body and an arcuate engaging protrusion formed around the pivot portion.
The flow path member has a curved engaging recess, and the flow path member has a curved engaging recess.
1 Or the pipe fitting according to 5 . When the lever is in the disengagement position, the sleeve is allowed to be displaced to the release position, and when it is in the connection position, it interferes with the sleeve and the sleeve is displaced to the release position. The pipe fitting according to claim 1, 5 or 6 , which is designed to be blocked. The flange portion of the pipe member has an annular recess facing the tip end side of the pipe member.
An annular elastic seal member that is pressed against the front end side surface of the flange portion and compressed in the direction of the longitudinal axis when the flow path member is hermetically engaged with the pipe member, and an outer circumference of the elastic seal member. It has a front tubular portion provided to cover the surface and has a front tubular portion.
Claimed, when the flow path member is hermetically engaged with the tube member, the tip of the front tubular portion projects forward of the elastic sealing member and is accepted by the annular recess. The pipe fitting according to any one of 1 to 7 .

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