JP2009144755A - Pipe joint with anti-rotation function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint with an anti-rotation function surely inhibiting a pair of pipe parts from turning relatively, realizing reduction in size and preventing a seal ring mounted thereon from being damaged. <P>SOLUTION: The pipe joint 10 with the anti-rotation function is provided with a male member 20 and a female member 40. The male member 20 consists of a male pipe part 21, a ring part 28 arranged in the outer periphery of the male pipe part with a gap, an engaging claw part 30 formed on the inner periphery of the ring part 28, a turning piece 32 extended radially outward from an end of the ring part 28 and containing a fitting part 34 in the tip thereof and a projecting piece 36 protrusively provided on a base side of the turning piece 32. The female member 40 consists of a female pipe part 41, an engaging part 43 protrusively provided on the outer periphery of the female pipe part 41 and engaged with the engaging claw part 30, a pressing part 47 turning the turning piece 32 by pressing the projecting piece 36 and a turning inhibiting part 45 to be fitted with the fitting part 34 when the piece 32 turns to inhibit a pair of pipe parts from turning relatively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint with an anti-rotation function that is used to connect a pair of pipe parts such as tubes and pipes and that can regulate the rotation of the pair of pipe parts.

  For example, when connecting a pair of pipe parts such as a tube, a pipe, and a hose, various methods are adopted, but when it is necessary to connect easily and quickly, a male member and a female member are connected. The pipe joint of the structure which connects a pair of pipe parts by having and connecting them is used. In addition, when a pair of pipe parts are connected to each other, if they rotate with each other, it may cause twisting of the pipe parts. Therefore, a rotation prevention function for restricting the rotation of the pipe parts is provided. Pipe fittings are being used.

  As a conventional pipe joint of this type, Patent Document 1 below includes a male member and a female member, and the male member has a pair of opposing support arms having locking projections on its main body, Is provided with a hook portion for locking the locking projection of each of the support arms on the outer peripheral surface of the main body, and when the main body of the male member is inserted into the main body of the female member, Disclosed is a pipe joint in which a locking projection of a support arm is locked, and a pipe joint in which a pair of opposed recessed groove portions into which the base portion of each of the support arms is fitted is formed at the distal end opening edge of the main body of the female member. ing. Further, a seal ring is attached to the outer periphery of the main body of the male member so as to contact the inner periphery of the female member and seal the gap between the outer periphery of the male member and the inner periphery of the female member.

Then, when the support arm and the concave groove are aligned and the main body of the male member is inserted into the main body of the female member, the hook portion engages with the locking projection, and the male member and the female member are connected to each other. The base portion of the support arm of the male member is fitted into the notch-shaped concave groove portion of the member so that the male member is prevented from rotating with respect to the female member, and the pair of pipe portions connected thereto are also prevented from rotating.
JP 2000-249275 A

  By the way, in a pipe joint in which a male member is inserted and connected to a female member, the outer periphery of the male member overlaps the inner periphery of the female member by a predetermined length from the viewpoint of securing connection strength and airtightness. However, in the case of the above-mentioned Patent Document 1, since the base portion of the support arm of the male member is fitted into the notch-shaped concave groove portion of the female member main body, the male groove is equivalent to the concave groove portion and the support arm. The member main body and the female member main body become long, resulting in a demerit that the entire pipe joint is enlarged. In addition, when it is desired to further increase the rotation restriction between the male member and the female member, the groove portion needs to be formed long in the axial direction of the main body in order to firmly fit the base portion of the support arm into the groove portion. As a result, the female member becomes larger.

  Furthermore, in Cited Document 1, a seal ring may be attached to the main body of the male member in order to ensure the airtightness between the male member and the female member. When the main body is inserted, the seal ring may be caught in the notch-shaped groove portion of the female member, and the seal ring may be damaged.

  Accordingly, an object of the present invention is to reliably restrict the rotation of the pair of pipe portions, to achieve a compact size, and to prevent damage to the seal ring when it is attached. Another object of the present invention is to provide a pipe joint with an anti-rotation function.

  In order to achieve the above object, according to a first aspect of the present invention, in a pipe joint including a male member and a female member that connect a pair of pipe parts, the male member includes a male pipe part that is inserted into the female member; A ring portion provided with a predetermined gap on the outer periphery of the male pipe portion via a support piece, an engaging claw portion formed on the inner periphery of the ring portion, and the female member receiving side of the ring portion A rotating piece that extends radially outward from the end of the rotating member and is provided with a fitting portion that is fitted to the outer periphery of the female member at the tip thereof, and protrudes from the base side of the rotating piece, And a protruding piece for rotating the rotating piece in contact with the female member when the male pipe portion is inserted into the female member, and the female member receives the male pipe portion on the inner periphery. A female tube portion inserted into a gap between the male tube portion and the ring portion, and a protrusion projecting on the outer periphery of the female tube portion, engaging with an engaging claw portion on the inner periphery of the ring portion An engaging portion; a pressing portion that pushes the protruding piece to turn the turning piece; and a fitting portion of the turning piece when the turning piece is turned, and a pair of pipe portions The present invention provides a pipe joint with an anti-rotation function, characterized in that it has a rotation restricting portion for restricting the rotation between the two.

  According to the above invention, when the male tube portion of the male member is inserted into the inner periphery of the female tube portion of the female member and the female tube portion of the female member is inserted into the gap between the male tube portion and the ring portion of the male member, The projecting piece of the rotating piece extended from the end of the part comes into contact with the pressing portion of the female member, and the rotating piece rotates toward the outer periphery of the female member. When the male tube portion of the male member is completely inserted into the female tube portion of the female member, the engaging portion of the female member engages with the engaging claw portion of the male member, and the male member and the female member are prevented from coming off. To be joined. At this time, the protruding piece of the rotating piece is further strongly pressed by the pressing portion of the female member, the fitting portion at the tip of the rotating piece is fitted into the rotation restricting portion of the female member, and the male member and the female member Is firmly connected in a state where the rotation is restricted. As described above, the male member and the female member can be connected by one-touch insertion operation, the rotation can be restricted, and the pipe connection work can be performed efficiently.

  Further, the rotating piece extends radially outward of the ring portion, and rotates when the male member and the female member are connected, and the fitting portion of the rotating piece controls the rotation of the female member. Since it is a structure fitted to the part, it is not necessary to increase the length of the male pipe part of the male member and the female pipe part of the female member, and the shape of the pipe joint can be kept relatively compact.

  Furthermore, according to the present invention, unlike the cited document 1, since it is not necessary to provide a notch-shaped concave groove at the tip of the female member, when the seal ring is provided on the outer periphery of the male member, It can be prevented from being damaged.

  According to a second aspect of the present invention, in the first aspect of the present invention, the protruding piece provided on the rotating piece includes a base portion protruding in a substantially vertical direction from a side surface on the base side of the rotating piece, and a distal end side of the base portion. And when the male pipe portion is inserted into the female member, the tip portion first contacts the pressing portion of the female member, and thereafter The present invention provides a pipe joint with an anti-rotation function which is configured such that the base portion abuts.

  According to the above invention, the projecting piece provided on the rotating piece has a base part that protrudes in a substantially vertical direction from the side surface of the rotating part on the base side, and a distal end that is bent from the tip side of the base part toward the inner diameter direction of the ring part Since the tip of the protruding piece easily comes into contact with the pressing part of the female member, even if the insertion stroke between the male pipe part of the male member and the female pipe part of the female member is relatively short, The rotating piece can be reliably rotated, and the pipe joint can be made compact. In the connected state, since the base of the protruding piece contacts the pressing portion of the female member, the fitting portion of the rotating piece is firmly brought into contact with the rotation restricting portion of the female member to The rotation restricted state can be maintained.

  According to the pipe joint with an anti-rotation function of the present invention, by inserting the male pipe part into the female pipe part, the engaging part engages with the engaging claw part, and the protruding piece is strongly pressed by the pressing part, Since the fitting portion is fitted to the rotation restricting portion, the male member and the female member can be connected and the rotation can be restricted by a one-touch insertion operation, and the pipe connection work can be performed efficiently.

  Further, the rotating piece extends radially outward of the ring portion, and rotates when the male member and the female member are connected, and the fitting portion of the rotating piece controls the rotation of the female member. Since it is a structure fitted to the part, it is not necessary to increase the length of the male pipe part of the male member and the female pipe part of the female member, and the shape of the pipe joint can be kept relatively compact. Furthermore, since it is not necessary to provide a notch-shaped concave groove at the tip of the female member as in the cited document 1, it is possible to prevent the seal ring from being damaged when the seal ring is provided on the outer periphery of the male member. .

  Hereinafter, an embodiment of a pipe joint with an anti-rotation function of the present invention will be described with reference to the drawings.

  The pipe joint 10 with rotation prevention function of the present invention (hereinafter referred to as “pipe joint 10”) is a pair of pipe parts such as tubes, pipes, hoses, etc. used in, for example, automobile radiators, heater units, fuel supply systems and the like. As shown in FIG. 1, a male member 20 and a female member 40 are used to connect each other.

  First, the male member 20 will be described. As shown in FIGS. 1 and 2, the male member 20 is formed of a tubular member bent at a predetermined angle. One end of the male member 20 forms a male pipe portion 21 inserted into a female pipe portion 41 of a female member 40 described later. The other end on the opposite side forms a tube connecting portion 23 to which a tube portion such as a tube or a pipe is connected.

  As shown in FIG. 2, a concave groove 21a is formed on the outer periphery in the middle of the male pipe portion 21 in the axial direction, and an annular seal ring 50 is attached to the concave groove 21a. An annular flange portion 25 protrudes from the outer periphery of the proximal end of the male tube portion 21, and a pair of support pieces 27, 27 are directed toward the distal end of the male tube portion 21 from the opposed portions of the outer periphery of the flange portion 25. It is extended. An elliptical ring portion 28 is provided on the outer periphery of the distal end of the male tube portion 21 via the pair of support pieces 27 and 27 so as to be bent with a predetermined gap C (FIGS. 2 and 3). reference).

  The ellipse-shaped ring portion 28 having a long diameter and a short diameter (see FIG. 3) is connected to the pair of support pieces 27 and 27 at the short diameter portion, and a female (described later) is connected to the inner periphery of the short diameter portion. Engagement claw portions 30, 30 that engage with the engagement portion 43 of the member 40 are provided facing each other (see FIG. 2). A taper surface 30a that gradually decreases in height toward the distal end of the male pipe portion 21 is formed on the distal end side of each engagement claw portion 30, and the proximal end side of the engagement claw portion 30 has a step shape. The engagement step portion 30b engages with the engagement wall portion 43b of the engagement portion 43 of the female member 40 described later (see FIG. 5).

  The outer periphery of the long-diameter portion of the ring portion 28 is provided with concave and convex grip portions 28a and 28a so as to face each other, and by gripping the grip portions 28a and 28a and pressing them in directions close to each other, 21. The ring portion 28 is elastically deformed so that a gap between the outer periphery of the 21 and the inner periphery of the engagement claw portion 30 is widened, and the engagement between the annular engagement portion 43 and the pair of engagement claw portions 30 and 30 engaged therewith. The match is released.

  A rotating piece 32 extends from the outer periphery of the ring portion 28 toward the radially outer side of the ring portion 28 through the thin hinge portion 31 from the end on the female member 40 receiving side. Has been. The rotating piece 32 in this embodiment is provided at one position on the outer peripheral side of the short diameter portion of the ring portion 28 and at a position aligned with the engaging claw portion 30 (see FIG. 1). Further, as shown in FIG. 2, the rotating piece 32 is provided on the outer periphery of the ring portion 28 in a state inclined at an angle θ with respect to the direction A orthogonal to the axis of the male pipe portion 21. The angle θ is preferably 15 to 75 °, and can be appropriately selected depending on the amount of rotation of the rotating piece 32, the fitting position of the rotating piece 32 with respect to the outer periphery of the female member 40, and the like.

  Further, a fitting portion 34 is provided on the distal end side of the rotating piece 32 so as to be fitted to the outer periphery of the female member 40 and to restrict the rotation of the male member 20 and the female member 40. . The fitting portion 34 in this embodiment is composed of a pair of fitting pieces 35, 35 protruding from both side edges in the width direction of the distal end of the rotating piece 32 toward the insertion direction into the female member 40, and on the inside thereof. A rotation restricting portion 45 that is a protrusion of the female member 40 is fitted. Note that the fitting portion 34 is not limited to the pair of fitting pieces 35 and 35 protruding from the tip of the turning piece 32, and may be, for example, a shape having a protrusion (in this case, turning). The restricting portion 45 has a concave groove shape), and is not particularly limited.

  Further, on the base side of the rotating piece 32, when the male pipe portion 21 is inserted into the female member 40, a projecting piece 36 for contacting the female member 40 and rotating the rotating piece 32 protrudes. It is installed. In this embodiment, the projecting piece 36 includes a base portion 37 projecting substantially vertically from one side surface of the rotating piece 32 on the base portion side in the direction of insertion into the female member 40, and a ring portion from the distal end side of the base portion 37. 28 and a distal end portion 38 bent in the inner diameter direction. When the male tube portion 21 is inserted into the female tube portion 41, the distal end portion 38 first comes into contact with a pressing portion 47 described later (see FIG. 4), and thereafter, the base portion 37 comes into contact therewith. It is configured (see FIG. 5).

  Further, when the fitting portion 34 is fitted to the rotation restricting portion 45 and the engaging claw portion 30 is engaged with the engaging portion 43, the male member 20 and the female member 40 are connected. As shown in FIG. 5, the base portion 37 of the projecting piece 36 comes into contact with the pressing portion 47. Thereby, the rotation of the rotating piece 32 in the radially outward direction is restricted, and the fitting state between the fitting part 34 and the turning restricting part 45 can be maintained. Further, in this embodiment, the base portion 37 protrudes substantially perpendicularly from one side surface of the base portion of the protruding piece 36, so that it firmly contacts the pressing portion 47 having a vertical surface (see FIG. 5) and rotates. The rotating piece 32 fitted to the restricting portion 45 is difficult to come off. In this embodiment, only one rotating piece 32 is provided on the outer periphery of the ring portion 28. However, a plurality of rotating pieces 32 may be provided on the outer periphery of the ring portion 28, and there is no particular limitation.

  Next, the female member 40 connected to the male member 20 will be described. The female member 40 has a cylindrical shape as a whole, and at one end thereof receives the male pipe portion 21 on the inner periphery, and a female pipe portion 41 inserted into the gap C between the male pipe portion 21 and the ring portion 28. Have.

  An annular engagement portion 43 that projects into the engagement claw portion 30 of the male member 20 projects from the outer periphery of the female tube portion 41 from the axial tip. A tapered surface 43a that gradually decreases in diameter toward the distal end of the female tube portion 41 is formed at the distal end of the engaging portion 43, and the proximal end portion of the engaging portion 43 has a stepped shape. The engagement wall portion 43b engages with the 30 engagement step portions 30b. The engaging portion 43 is not limited to an annular projecting shape, and may have an annular concave groove shape (in this case, the engaging claw portion 30 has a protruding shape that fits into the concave groove. ), Not particularly limited. Further, the engaging portion 43 may be provided at a position opposite to the outer periphery of the female tube portion 41 in correspondence with the pair of engaging claw portions 30 and 30 without being provided in an annular shape around the entire circumference of the female tube portion 41. There is no particular limitation.

  Further, a rotation for fitting the fitting portion 34 of the turning piece 32 to the outer periphery in the middle of the axial direction of the female pipe portion 41 to restrict the rotation of the male member 20 and the female member 40. A restricting portion 45 is provided. The rotation restricting portion 45 of this embodiment has a protrusion with a predetermined width and is fitted between a pair of fitting pieces 35, 35 forming the fitting portion 34. Further, similarly to the tube connection portion 23 of the male member 20, a tube portion such as a tube or a pipe is connected to the outer periphery of the female tube portion 41 on the proximal end side with respect to the protruding rotation restricting portion 45. It is like that.

  Further, the end face on the distal end side of the projecting rotation restricting portion 45 forms a pressing portion 47 for pushing the protruding piece 36 of the rotating piece 32 of the male member 20 to rotate the rotating piece 32. Yes. The pressing portion 47 of this embodiment forms a surface perpendicular to the axis of the female tube portion 41, and is firmly attached to the base portion 37 of the protruding piece 36 when the male member 20 and the female member are connected. It comes into contact (see FIG. 5).

  Next, the usage method of the pipe joint 10 which consists of the said structure is demonstrated.

  That is, as shown in FIG. 1, after the rotation piece 32 of the male member 20 is aligned with the rotation restricting portion 45 of the female member 40, the male member 20 is moved relative to the female member 40 as shown in FIG. 2. The male pipe part 21 is inserted into the inner periphery of the female pipe part 41 and the female pipe part 41 is inserted into the gap C between the male pipe part 21 and the ring part 28.

  Then, while being guided by the tapered surfaces 30 a and 43 a, the engaging portion 43 of the female tube portion 41 enters between the engaging claw portion 30 and the male tube portion 21, and the inner periphery of the ring portion 28 is engaged with the engaging portion 43. The ring portion 28 is pushed and spread, and at the same time, the distal end portion 38 of the protruding piece 36 comes into contact with the pressing portion 47 (see FIG. 4).

  When the male tube portion 21 is further inserted into the female tube portion 41 in the above state, the distal end portion 38 of the protruding piece 36 is pressed by the pressing portion 47, and the rotating piece 32 rotates toward the outer periphery of the female member 40. Start to move. When the male tube portion 21 is further pushed in and the male tube portion 21 is completely inserted into the female tube portion 41, the engaging portion 43 gets over the engaging claw portion 30 and the engaging wall portion of the engaging portion 43 is engaged. 43b engages with the engaging step portion 30b of the engaging claw portion 30, and the male member 20 and the female member 40 are joined in a state of being prevented from coming off.

  At this time, the distal end portion 38 of the protruding piece 36 is further strongly pressed by the pressing portion 47 of the female member 40, and the rotating piece 32 is greatly rotated toward the outer peripheral side of the female member 40, so Inside the pair of fitting pieces 35, 35 forming the fitting portion 34, the protrusion rotation restricting portion 45 enters and fits, and at the same time, the base portion 37 of the protruding piece 36 contacts the pressing portion 47, The fitting state of the fitting part 34 and the rotation restricting part 45 is maintained, and the male member 20 and the female member 40 can be firmly connected in a state where the turning is restricted. As a result, a pair of pipe parts connected to the male member 20 and the female member 40 can be reliably connected without rotating. In addition, the seal ring 50 mounted on the outer periphery of the male tube portion 21 contacts the inner periphery of the female tube portion 41, and the gap between the outer periphery of the male tube portion 21 and the inner periphery of the female tube portion 41 is hermetically sealed.

  As described above, in the pipe joint 10, the male member 20 and the female member 40 can be easily connected and rotated by a one-touch insertion operation of inserting the male pipe portion 21 into the female pipe portion 41. Since it can regulate, pipe connection work can be performed efficiently.

  In this pipe joint 10, the rotating piece 32 extends outward in the radial direction of the ring portion 28, and rotates when the male member 20 and the female member 40 are connected. Since the structure in which the 32 fitting parts 34 are fitted to the rotation restricting part 45 is adopted, it is not necessary to increase the length of the male pipe part 21 of the male member 20 and the female pipe part 41 of the female member 40. The shape of the pipe joint 10 can be kept relatively compact.

  Further, since the pipe joint 10 employs the rotation restricting structure as described above, it is not necessary to provide a notch-shaped concave groove at the tip of the female member 40 as in the cited document 1. Therefore, when inserting the male pipe part 21 in the female pipe part 41, it can prevent that the seal ring 50 with which the outer periphery of the male pipe part 21 was mounted | worn is damaged.

  Further, since the rotating piece 32 extends outward in the radial direction of the ring portion 28, when the entire male member 20 is viewed in the axial direction, the male pipe portion 21 and the ring portion of the male member 20. There are few parts which overlap with 28, and the type | mold structure at the time of carrying out the injection molding of the male member 20 can be made comparatively simple. As a result, the freedom degree of the shape of the rotation piece 32 can be raised, and the rotation piece 32 can be formed without impairing the fitting force with respect to the outer periphery of the female member 40. For example, the rotating piece 32 is widened along the circumferential direction of the ring portion 28 as indicated by an imaginary line S1 in FIG. 3, or the axial center of the male pipe portion 21 is indicated as indicated by an imaginary line S2 in FIG. The angle θ of the rotating piece 32 with respect to the orthogonal direction A is changed, or the fitting portion 34 at the tip of the rotating piece 32 is protruded high as shown by an imaginary line S3 in FIG. The shape of the moving piece 32 can be determined as appropriate. As a result, the fitting force of the fitting portion 34 with respect to the rotation restricting portion 45 can be maintained, and the rotation restriction between the pair of pipe portions can be reliably achieved.

  Further, since the rotating piece 32 extends outward in the radial direction of the ring portion 28, it does not become an obstacle when the male tube portion 21 is inserted into the female tube portion 41, and the female tube portion 41 has a male tube. The part 21 can be inserted smoothly.

  Furthermore, in this embodiment, the protruding piece 36 provided on the rotating piece 32 includes a base portion 37 protruding in a substantially vertical direction from a side surface of the rotating piece 32 on the base side, and a ring portion 28 from the distal end side of the base portion 37. , The tip end of the protruding piece 36 is likely to come into contact with the pressing portion 47 of the female member 40, and the insertion stroke between the male tube portion 21 and the female tube portion 41 is facilitated. Even if it is comparatively short, the rotation piece 32 can be reliably rotated and the pipe joint 10 can be made compact.

  Further, when the male member 20 and the female member 40 are connected, the base portion 37 of the protruding piece 36 contacts the pressing portion 47, so that the fitting portion 34 of the rotating piece 32 firmly contacts the rotation restricting portion 45. Thus, the rotation restricted state of the female member 40 relative to the male member 20 can be firmly held.

  When it is desired to remove the pair of pipe portions for maintenance or other reasons, first, the gripping portions 28a and 28a on the outer periphery of the ring portion 28 are pressed so as to be close to each other. Then, the ring portion 28 is elastically deformed so that a gap between the outer periphery of the male pipe portion 21 and the inner periphery of the engagement claw portion 30 is widened, and the annular engagement portion 43 and the pair of engagement claw portions 30 and 30 are separated. The engagement is released. When the male tube portion 21 is pulled out from the female tube portion 41 in this state, the base portion 37 of the projecting piece 36 is separated from the pressing portion 47 and the rotating piece 32 is elastically returned to the original position, and the male member 20 and the female member 20 are removed. The connection with the member 40 can be released.

It is a disassembled perspective view which shows one Embodiment of the pipe joint with a rotation prevention function of this invention. It is sectional drawing of the pipe joint with the same rotation prevention function. It is a side view of the male member which comprises the pipe joint with the same rotation prevention function. It is the sectional view of the state where the use condition of the pipe joint with the same rotation prevention function was shown and the male member was inserted into the female member to predetermined depth. It is the sectional view of the state where the use state of the pipe joint with the same rotation prevention function was shown and the male member was inserted completely in the female member.

Explanation of symbols

10 Pipe joint with anti-rotation function (pipe joint)
20 male member 21 male pipe part 27 support piece 28 ring part 30 engaging claw part 32 rotating piece 34 fitting part 36 projecting piece 37 base part 38 tip part 40 female member 41 female pipe part 43 engaging part 45 rotation restricting part 47 Pressing part C Gap

Claims (2)

In a pipe joint composed of a male member and a female member that connect a pair of pipe parts,
The male member is formed on a male tube portion inserted into the female member, a ring portion provided with a predetermined gap on the outer periphery of the male tube portion via a support piece, and an inner periphery of the ring portion. And a fitting portion that extends radially outward from an end of the ring portion on the female member receiving side and that fits on the outer periphery of the female member. A moving piece and a protruding piece that projects from the base side of the rotating piece and rotates the rotating piece in contact with the female member when the male pipe is inserted into the female member. And
The female member receives the male pipe portion on the inner periphery, is inserted into a gap between the male pipe portion and the ring portion, and protrudes from the outer periphery of the female tube portion. An engaging portion that engages with the engaging claw portion, a pressing portion that pushes the protruding piece to rotate the rotating piece, and a fitting portion of the rotating piece when the rotating piece rotates. A pipe joint with an anti-rotation function, characterized by having a rotation restricting part for restricting the rotation of the pair of pipe parts.   The projecting piece provided on the rotating piece includes a base part projecting in a substantially vertical direction from a side surface on the base side of the rotating piece, and a tip part bent in the inner diameter direction of the ring part from the tip side of the base part. And when the male pipe portion is inserted into the female member, the tip portion comes into contact with the pressing portion of the female member first, and then the base portion comes into contact therewith. 1. A pipe joint with an anti-rotation function according to 1.

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