JP2019168051A - Pipe joint - Google Patents

Abstract

To provide a pipe joint capable of preventing dust from occurring.SOLUTION: A pipe joint 1 comprises: a cylindrical joint body 2; a ring-shaped holder member 5 having an insertion part 51 inserted into the joint body 2 and an exposed part 52 exposed from the joint body 2, and capable of being reduced in diameter; and a tightening cylinder 6 externally fitted to the joint body 2, and having a tapered contact surface 61 that abuts the exposed part 52 to reduce the diameter of the exposed part 52. On an outer wall of the joint body 2, a protrusion part 27 is provided. On an outer wall of the tightening cylinder 6, an engagement path 62 is provided that engages with the protrusion part 27 and guides the protrusion part 27 in the direction of reducing the diameter of the exposed part 52.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint for connecting pipes.

  Conventionally, as a technique in such a field, for example, as described in Patent Document 1 below, a pipe joint including a cylindrical joint body and an inner cylinder fitted into the joint body is known. In the pipe joint described in Patent Document 1, a radially displaceable holding piece is formed on the inner cylinder, and tapered tightening portions are formed on the outer periphery of the holding piece and the inner periphery of the joint body, respectively. Then, a biting protrusion is formed on the holding piece, and the biting protrusion is bitten into the outer wall of the pipe, thereby preventing the pipe from coming off.

JP-A-9-292070

  However, in the above-mentioned pipe joint, when the pipe is inserted into the inner cylinder and attached to the pipe joint or when the pipe is removed from the pipe joint, it is necessary to insert or extract the pipe while pushing down the biting protrusion on the outer wall of the pipe. There is. For this reason, the outer wall of the piping is scraped by the biting protrusion, which causes a problem of dust generation. When a problem of dust generation occurs, dust or the like flows to the side supplied along the liquid flowing through the pipe joint, causing the liquid to become dirty.

  This invention is made | formed in order to solve such a technical subject, Comprising: It aims at providing the pipe joint which can prevent dust generation.

  A pipe joint according to the present invention is a pipe joint for connecting pipes, and includes a tubular joint body, an insertion part inserted into the joint body, and an exposed part exposed from the joint body. And a ring-shaped holder member that can be deformed to a reduced diameter, and a taper-shaped contact surface that is fitted on the joint body and contacts the exposed portion of the holder member to reduce the diameter of the exposed portion. A tightening cylinder, and a protrusion is provided on the outer wall of the joint body. The outer wall of the tightening cylinder is engaged with the protrusion of the joint body and the protrusion is connected to the holder member. An engagement path is provided for guiding the exposed portion in the direction of reducing the diameter.

  In the pipe joint according to the present invention, a protrusion is provided on the outer wall of the joint body, and an engagement path is provided on the outer wall of the tightening cylinder to engage the protrusion and guide the protrusion in the direction of reducing the diameter of the exposed portion. Therefore, it is possible to reduce the diameter of the exposed portion of the holder member or to cancel the reduced diameter state by the cooperation of the joint body and the tightening cylinder. For this reason, when the pipe is attached to the pipe joint or removed from the pipe joint, the reduced diameter state of the exposed part is released, so that the pipe can be inserted or extracted without contacting the exposed part. In this way, since the outer wall of the pipe is not scraped, dust generation can be prevented.

  In the pipe joint according to the present invention, the engagement path is inclined with respect to the axial direction of the clamping cylinder and extends in the circumferential direction of the clamping cylinder, and is orthogonal to the axial direction. It is preferable to have at least a second engagement path extending in the circumferential direction. In this way, the operation of reducing the diameter of the exposed portion of the holder member or releasing the reduced diameter state of the exposed portion can be performed reliably.

  The pipe joint which concerns on this invention WHEREIN: It is preferable that the both ends of the said engagement path are block | closed in the outer wall of the said clamping cylinder. In this way, it is not necessary to remove the tightening cylinder from the joint body when installing and removing the pipe, so that loss of parts and the like can be prevented.

  Moreover, the pipe joint which concerns on this invention WHEREIN: It is preferable that the biting protrusion which bites into the outer wall of the said piping is provided in the said exposed part of the said holder member. In this way, it is possible to prevent the pipe from coming off by causing the biting protrusion to bite into the outer wall of the pipe.

  In the pipe joint according to the present invention, the holder member is provided with a plurality of slits extending along the axial direction of the holder member, and the plurality of slits are alternately arranged from the insertion portion side and the exposed portion side. Preferably it is formed. In this way, it is possible to easily reduce the diameter of the exposed portion or to cancel the reduced diameter state.

  Further, in the pipe joint according to the present invention, the insertion portion of the holder member is inserted into the joint main body via a cylindrical guide member externally fitted to the insertion portion, and the exposure of the holder member is performed. The part is preferably exposed from the guide member.

  Furthermore, in the pipe joint according to the present invention, a seal member that is in close contact with at least a part of the front end side surface of the pipe is provided inside the joint body, and the seal member is disposed inside the joint body by the guide member. It is preferable to be pressed against the stepped portion provided in the. In this way, since the seal member is always compressed by the guide member, stable sealing performance and sanitary performance can be ensured.

  Furthermore, in the pipe joint according to the present invention, it is preferable that the seal member has an end surface seal portion that comes into contact with the front end surface of the pipe and a side surface seal portion that comes into contact with a part of the front end side surface of the pipe. If it does in this way, since the penetration | invasion of the liquid to the area | region from the end surface of piping to the arrangement | positioning location of the sealing member of a side surface can be suppressed, the sanitary property of a pipe joint can be improved.

  According to the present invention, dust generation can be prevented.

It is a disassembled perspective view which shows the pipe joint which concerns on 1st Embodiment. It is a front view showing a pipe joint concerning a 1st embodiment. It is sectional drawing which shows the pipe joint which concerns on 1st Embodiment. It is a perspective view which shows a clamping cylinder. It is sectional drawing which shows the pipe joint before resin pipe insertion. It is sectional drawing which shows the state which inserted the resin pipe into the pipe joint. It is sectional drawing which shows the state which bites into a resin pipe by rotation of a clamping cylinder. It is sectional drawing which shows the pipe joint which concerns on 2nd Embodiment. It is sectional drawing which shows the pipe joint which concerns on 3rd Embodiment.

<First Embodiment>
Hereinafter, embodiments of a pipe joint according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a pipe joint according to the first embodiment, FIG. 2 is a front view showing the pipe joint according to the first embodiment, and FIG. 3 shows the pipe joint according to the first embodiment. It is sectional drawing.

  The pipe joint 1 according to the present embodiment is used for connecting a resin pipe (pipe) 10 for transporting a liquid such as a beverage or a chemical solution, for example, and includes a cylindrical joint body 2 and an inside of the joint body 2. A seal member 3 and a guide member 4 inserted into the holder body 5, a part of the holder member 5 inserted into the joint body 2 and the other part exposed from the joint body 2, a seal member 3, the guide member 4 and the holder member And a tightening cylinder 6 fitted to the joint body 2 so as to confine 5 inside the joint body 2. Since the joint main body 2, the seal member 3, the guide member 4, the holder member 5, and the tightening cylinder 6 are assembled in a state of being arranged substantially coaxially, the central axes of these components substantially overlap. Therefore, in the following description, the axial direction of each component is not referred to, but is uniformly referred to as “axis L direction”.

  The joint body 2 is formed of a resin material such as polypropylene so as to have a stepped hollow portion therein. As shown in FIG. 3, the hollow portion of the joint body 2 includes a small-diameter hollow portion 21 formed with a relatively small diameter, a large-diameter hollow portion 23 formed with a relatively large diameter, and a small-diameter hollow portion 21. And a medium-diameter hollow portion 22 that communicates with the large-diameter hollow portion 23. A first step portion 24 is formed between the small-diameter hollow portion 21 and the medium-diameter hollow portion 22, and a second step portion 25 is formed between the medium-diameter hollow portion 22 and the large-diameter hollow portion 23. .

  Further, on the outer wall of the joint body 2, a screw portion 26 is provided around a portion corresponding to the small-diameter hollow portion 21, and two protrusions 27 are provided on a portion corresponding to the large-diameter hollow portion 23. The two protrusions 27 have a cylindrical shape protruding outward from the outer wall of the joint body 2, and are arranged at intervals of 180 ° along the circumferential direction of the joint body 2.

  The seal member 3 is a packing formed in a ring shape with a rubber material, for example. The sealing member 3 has a substantially V-shaped cross section with a thick portion 31 formed on the outside and formed relatively thick, and a thin portion 32 formed on the inside and formed relatively thin. . As shown in FIG. 3, the seal member 3 is inserted into the large-diameter hollow portion 23 of the joint body 2 so that the V-shaped opening faces the small-diameter hollow portion 21, and comes into contact with the second step portion 25 described above. ing. At this time, the thick portion 31 of the seal member 3 contacts the second step portion 25, but the thin portion 32 does not contact the second step portion 25 and is in a free state. And in the state where the resin pipe 10 mentioned later is inserted, this thin part 32 closely_contact | adheres with the outer wall of the resin pipe 10 suitably (refer FIG.6 and FIG.7).

  The guide member 4 is formed in a substantially cylindrical shape by a resin material such as polypropylene. The guide member 4 includes a cylindrical portion 41 that can be inserted into the large-diameter hollow portion 23 of the joint body 2 and an annular flange portion 42 that is connected to the cylindrical portion 41 and projects outward in the radial direction. The flange portion 42 is formed so as to be able to contact the end surface of the large-diameter hollow portion 23 of the joint body 2 so as to regulate the insertion depth of the cylindrical portion 41 into the large-diameter hollow portion 23. Further, a stepped portion 43 for restricting the insertion depth of the holder member 5 into the cylindrical portion 41 is provided inside the cylindrical portion 41.

  The holder member 5 is formed in a ring shape from a resin material such as polyether ether ketone. The holder member 5 includes an insertion portion 51 that is formed to be relatively small and can be inserted into the cylindrical portion 41 of the guide member 4, and an exposed portion 52 that is formed to be relatively large and is exposed from the cylindrical portion 41. A plurality of biting protrusions 53 that bite into the outer wall of the resin tube 10 are provided inside the exposed portion 52. Further, the holder member 5 is provided with a plurality of slits 54 extending in the axis L direction so that the diameter of the holder member 5 can be reduced. The plurality of slits 54 are alternately formed from the insertion portion 51 side and the exposed portion 52 side.

  The holder member 5 configured as described above is inserted into the large-diameter hollow portion 23 of the joint body 2 via the guide member 4 fitted on the insertion portion 51, and the exposed portion 52 is the large-diameter hollow portion 23 and In a state exposed from the guide member 4, the joint body 2 is attached.

  FIG. 4 is a perspective view showing a tightening cylinder. The fastening cylinder 6 is formed so as to be engageable with the joint body 2, and tightens the exposed portion 52 of the holder member 5 in cooperation with the joint body 2 to reduce the diameter of the exposed portion 52. The fastening cylinder 6 is formed in a substantially cylindrical shape by a resin material such as polypropylene. Inside the tightening cylinder 6, a tapered contact surface 61 is provided that contacts the exposed portion 52 of the holder member 5 and reduces the diameter of the exposed portion 52. The contact surface 61 is inclined so as to rise toward the holder member 5 and contacts the outer end surface of the exposed portion 52 (see FIG. 3).

  Further, two engagement paths 62 are provided on the outer wall of the tightening cylinder 6, which are paths that penetrate the outer wall and engage with the two protrusions 27 in the joint body 2. These two engagement paths 62 are arranged one-to-one with respect to the two protrusions 27 described above, and guide the protrusions 27 in the direction of reducing the diameter of the exposed part 52 of the holder member 5. Is formed. Specifically, each engagement path 62 is inclined with respect to the direction of the axis L and communicates with the first engagement path 621 extending in the circumferential direction of the tightening cylinder 6 and the first engagement path 621, and the axis L And a second engagement path 622 extending in the circumferential direction and orthogonal to the direction.

  The first engagement path 621 causes the contact surface 61 to contact the outer end surface of the exposed portion 52 of the holder member 5 so that the biting protrusion 53 provided on the exposed portion 52 gradually bites into the outer wall of the resin tube 10. To play a role. On the other hand, the second engagement path 622 maintains the state in which the contact surface 61 is in contact with the outer end surface of the exposed portion 52, that is, maintains the state in which the biting protrusion 53 is bitten into the outer wall of the resin tube 10. . The length of the engagement path 62 in the circumferential direction of the tightening cylinder 6 is set to a range of about 60 °.

  Both ends of the engagement path 62 are closed at the outer wall of the tightening cylinder 6. Specifically, the end of the first engagement path 621 that is one end of the engagement path 62 extends to the joint body 2 side, and remains on the outer wall of the tightening cylinder 6 without being opened outward. . The end of the second engagement path 622 that is the other end of the engagement path 62 is not opened outward, but remains on the outer wall of the tightening cylinder 6.

  As shown in FIG. 4, in order to facilitate the engagement between the protrusion 27 and the engagement path 62, other parts are disposed near the end of the first engagement path 621 on the inner wall of the tightening cylinder 6. A thinner thin portion 63 is formed. In addition, the outer wall of the fastening cylinder 6 on the side opposite to the thin portion 63 is provided to prevent the finger from slipping when the operator rotates the fastening cylinder 6 relative to the joint body 2. An anti-slip portion 64 is provided.

  Hereinafter, attachment and removal of the resin pipe 10 using the pipe joint 1 of the present embodiment will be described with reference to FIGS.

  As shown in FIG. 5, in a state where the joint body 2, the seal member 3, the guide member 4, the holder member 5, and the tightening cylinder body 6 are assembled, the seal member 3 is pressed against the second step portion 25 by the guide member 4. Yes. The protrusion 27 of the joint body 2 is positioned in the vicinity of the end of the first engagement path 621 of the engagement path 62 while being engaged with the engagement path 62 of the fastening cylinder 6. At this time, the contact surface 61 of the tightening cylinder 6 is in contact with the outer end surface of the exposed portion 52 of the holder member 5, but the exposed portion 52 is not reduced in diameter.

  As shown in FIG. 6, when the resin pipe 10 is inserted into the pipe joint 1, the biting protrusion 53 provided on the exposed portion 52 of the holder member 5 does not contact the outer wall of the resin pipe 10. Does not interfere with the biting projection 53 and smoothly passes through the inside of the tightening cylinder 6, the holder member 5, the guide member 4 and the seal member 3 in order, and is inserted into the joint body 2. Then, when inserting the inside of the seal member 3, the resin tube 10 advances by pushing down the thin portion 32 of the seal member 3. As described above, since the seal member 3 is formed of a rubber material, no dust is generated even if the outer wall of the resin tube 10 contacts the thin portion 32. The resin tube 10 is inserted until the tip surface of the resin tube 10 contacts the first step portion 24 of the joint body 2.

  As shown in FIG. 7, when the tightening cylinder 6 is rotated with respect to the joint body 2 after the front end surface of the resin tube 10 comes into contact with the first step portion 24, the protrusion 27 of the joint body 2 is engaged with the engagement path. The guide slides with the engagement path 62 while being guided by the guide 62. At this time, the contact surface 61 of the tightening cylinder 6 presses the outer end surface of the exposed portion 52 of the holder member 5 from the outer peripheral side. As a result, the exposed portion 52 is deformed in a reduced diameter, and the biting projection 53 bites into the outer wall of the resin tube 10 to prevent the resin tube 10 from coming off. Then, when the protrusion 27 slides to the end of the second engagement path 622, the rotation of the tightening cylinder 6 ends. As a result, the resin pipe 10 is attached to the pipe joint 1, that is, is connected to the pipe joint 1.

  On the other hand, when removing the resin pipe 10 from the pipe joint 1, the tightening cylinder 6 is rotated in the reverse direction so that the protrusion 27 slides from the end of the second engagement path 622 to the end of the first engagement path 621. To do. As a result, the state in which the contact surface 61 of the tightening cylinder 6 presses the outer end surface of the exposed portion 52 is released, and the biting protrusion 53 of the holder member 5 is separated from the outer wall of the resin tube 10. The resin tube 10 can be removed by removing the resin tube 10 from the inside of the pipe joint 1 after releasing the state of biting into the resin tube 10 by the biting protrusion 53.

  As described above, in the present embodiment, when the resin pipe 10 is attached to or removed from the pipe joint 1, the resin pipe 10 does not come into contact with the biting protrusion 53 of the holder member 5. No interference occurs. For this reason, dust generation due to interference between the outer wall of the resin tube 10 and the biting protrusion 53 can be reliably prevented. Further, for example, the resin tube 10 is less forcedly deformed when the resin tube 10 is attached than a conventional tightening joint having a nut and a sleeve, and therefore, the resin tube 10 is repeated without cutting the deformed portion of the resin tube 10. It can be used, and the cost can be reduced.

  Further, since both ends of the engagement path 62 are blocked by the outer wall of the tightening cylinder 6, it is not necessary to remove the tightening cylinder 6 from the joint body 2 when the resin tube 10 is attached and detached. Can be lost. Furthermore, the diameter of the exposed portion 52 of the holder member 5 can be reduced or the reduced diameter state of the exposed portion 52 can be released simply by rotating the tightening cylinder 6 only about 60 ° relative to the joint body 2. Thus, the resin tube 10 can be attached and detached. Therefore, for example, the resin tube 10 can be attached and detached even in a limited space where only one hand can be inserted.

  Furthermore, since the seal member 3 is pressed against the second step portion 25 provided inside the joint body 2 by the guide member 4, for example, the seal member 3 is compared with the case where the seal member is disposed in the circumferential groove. Since the guide member 4 is always compressed, stable sealing properties and sanitary properties (ie, hygiene and cleanliness) can be ensured.

Second Embodiment
FIG. 8 is a cross-sectional view showing a pipe joint according to the second embodiment. The pipe joint 1A according to the present embodiment is different from the above-described first embodiment in the shape of the seal member, but the other structure is the same as that of the first embodiment, so that the duplicated explanation is omitted.

  As shown in FIG. 8, in this embodiment, an O-ring 3A is used as a seal member. The O-ring 3 </ b> A is formed of, for example, a rubber material, and is externally fitted to the resin tube 10 so as to be in close contact with a part of the side surface of the tip of the resin tube 10. The O-ring 3 </ b> A is pressed against the second step portion 25 of the joint body 2 by the guide member 4. According to the pipe joint 1A of the present embodiment, the same operational effects as those of the first embodiment described above can be obtained.

<Third Embodiment>
FIG. 9 is a cross-sectional view showing a pipe joint according to the third embodiment. The pipe joint 1B according to the present embodiment is different from the above-described first embodiment in the shape of the hollow portion of the joint body and the seal member, but the other structure is the same as that of the first embodiment, and thus the duplicated explanation is omitted. To do.

  As shown in FIG. 9, the hollow portion of the joint body 2 </ b> B does not have the medium-diameter hollow portion 22, and includes a small-diameter hollow portion 21 and a large-diameter hollow portion 23. A stepped portion 28 is formed between the small diameter hollow portion 21 and the large diameter hollow portion 23. An annular seal member 3 </ b> B is in contact with the stepped portion 28.

  The seal member 3 </ b> B includes an end surface seal portion 33 that contacts the front end surface of the resin tube 10 and a side surface seal portion 34 that contacts a part of the front end side surface of the resin tube 10. Specifically, the seal member 3B includes an end face seal portion 33 that is in close contact with the front end surface of the resin tube 10, and a side surface that extends in the axis L direction from the end surface seal portion 33 and is in close contact with a part of the front end side surface of the resin tube 10. The seal portion 34 is formed in a substantially L-shaped cross section. The seal member 3B is arranged in a state in which the front end surface of the end surface seal portion 33 is in contact with the step portion 28 and the rear end surface of the side surface seal portion 34 is in contact with the guide member 4. 28 is pressed against. The seal member 3B is made of, for example, a rubber material.

  According to the pipe joint 1 </ b> B of the present embodiment, the same effects as those of the first embodiment described above can be obtained, and the end surface seal portion 33 in which the seal member 3 </ b> B comes into contact with the tip surface of the resin pipe 10, Since it has the side seal part 34 which contacts a part of front end side surface, the following effects can be obtained further.

  That is, in a site where liquids such as beverages and chemicals are manufactured or used, sanitary properties are required not only for resin pipes that transport these liquids but also for pipe joints for connecting the resin pipes. Therefore, the pipe joint is required to have a certain sealing property in order to prevent intrusion of foreign matters, germs and the like and liquid leakage. In the case of the sealing member 3 described in the first embodiment and the O-ring 3A described in the second embodiment, the sealing member is brought into contact with a part of the tip side surface of the resin tube 10 to ensure the sealing performance. The region from the end face of the resin tube 10 to the location of the side seal member is not sealed. For this reason, the liquid flowing through the resin tube 10 may enter the region and stay there. Such stagnation of the liquid cannot be easily removed by ordinary cleaning, and thus affects the sanitary properties of the pipe joint.

  On the other hand, the seal member 3B of the present embodiment has the end surface seal portion 33 that contacts the tip surface of the resin tube 10 in addition to the side surface seal portion 34 that contacts a part of the tip side surface of the resin tube 10. By sealing the front end surface of the resin tube 10, it is possible to reliably prevent liquid intrusion and liquid stagnation into the above-described region. As a result, the sanitary property of the pipe joint 1B can be improved.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, in the above-described embodiment, the example in which the engagement path 62 is formed by a path that penetrates the outer wall of the tightening cylinder 6 has been described. However, the engagement path 62 may be formed by a groove that does not penetrate the outer wall.

1, 1A, 1B Pipe joint 2, 2B Joint body 3, 3B Seal member 3A O-ring (seal member)
4 Guide member 5 Holder member 6 Clamping cylinder 10 Resin pipe (pipe)
23 Large-diameter hollow portion 26 Threaded portion 27 Projection portion 31 Thickness portion 41 Cylindrical portion 42 Gutter portion 43 Stepped portion 51 Insertion portion 52 Exposed portion 53 Biting projection 54 Slit 61 Abutment surface 62 Engagement path 621 First engagement path 622 Second engagement path

Claims (8)

A pipe joint for connecting pipes,
A tubular joint body;
A ring-shaped holder member that has an insertion portion that is inserted into the joint body and an exposed portion that is exposed from the joint body;
A tightening cylinder externally fitted to the joint body, and having a tapered contact surface that contacts the exposed portion of the holder member to reduce the diameter of the exposed portion;
With
The outer wall of the joint body is provided with a protrusion,
The outer wall of the tightening cylinder is provided with an engagement path that engages with the protrusion of the joint body and guides the protrusion in the direction of reducing the diameter of the exposed portion of the holder member. Characteristic pipe joint.   The engagement path is inclined with respect to the axial direction of the fastening cylinder and extends in the circumferential direction of the clamping cylinder, and a second engagement that is orthogonal to the axial direction and extends in the circumferential direction. The pipe joint according to claim 1, comprising at least a joint.   The pipe joint according to claim 1 or 2, wherein both ends of the engagement path are closed at an outer wall of the tightening cylinder.   The pipe joint according to any one of claims 1 to 3, wherein the exposed portion of the holder member is provided with a biting protrusion that bites into an outer wall of the pipe. The holder member is provided with a plurality of slits extending along the axial direction of the holder member,
The pipe joint according to any one of claims 1 to 4, wherein the plurality of slits are alternately formed from the insertion portion side and the exposed portion side. The insertion portion of the holder member is inserted into the joint main body through a cylindrical guide member that is externally fitted to the insertion portion,
The pipe joint according to claim 1, wherein the exposed portion of the holder member is exposed from the guide member. Inside the joint body is provided with a seal member that is in close contact with at least a part of the tip side surface of the pipe,
The pipe joint according to claim 6, wherein the seal member is pressed against a step portion provided inside the joint body by the guide member.   The pipe joint according to claim 7, wherein the seal member has an end face seal portion that comes into contact with a front end face of the pipe and a side face seal portion that comes into contact with a part of a front end side face of the pipe.

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