JP2012154488A - Pipe joint, pipe connection structure, and pipe connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint, a pipe connection structure, and a pipe connection metho, having superior waterproofness irrespective of irregularities of an outer circumference face of a pipe body, and facilitating connection of the pipe body.SOLUTION: When a corrugated pipe 13a is inserted, the corrugated pipe 13a can be inserted without being caught with a holding claw 15 due to the tapered shape of the holding claw 15. A corrugated pipe 13b is in a state completely inserted and held in the pipe joint 1. In this state, packing 5b is crushed by a chip of the corrugated pipe 13b. Since the packing 5b includes a very large deformation amount, it can be deformed in accordance with a chip shape of the corrugated pipe 13b, and waterproofing can be positively carried out. In this state, the holding claw 15 caches the entire circumference of a trough part 25 of the corrugated pipe 13b, and thus the corrugated pipe 13b is not detached from the pipe joint 1.

Description

  The present invention relates to a pipe joint, a pipe connection structure, and a pipe connection method that are excellent in waterproofness without water entering from the outside and that allow easy connection of pipe bodies.

  Conventionally, steel pipes, resin-like corrugated flexible pipes, and the like are used as protective pipes for electric wires and the like. These protective tubes are used by connecting protective tubes to each other as necessary, or connecting a protective tube and a wiring box, a switch box, or the like. A pipe joint is used for the connection part of these protective pipes. Since electric wires and the like are passed through the inside of the pipe joint, high waterproofness is required particularly for pipe joints used outdoors.

  As such a pipe joint having waterproofness, for example, a tubular body is inserted into a tightening nut and a rubber packing, and a tubular sleeve is inserted between the tubular body and the covering layer of the tubular body, There is a joint for a covered conduit tube that is joined to a tightening nut so that a joint body is placed on a sleeve (Patent Document 1).

  Also, for conduits that use a synthetic resin sealing body, cut a part of the annular sealing body, insert the pipe body into the sealing body, and connect the tightening nut and joint body so as to sandwich the sealing body There is a joint sealing body (Patent Document 2).

Japanese Patent Laid-Open No. 08-98369 Japanese Utility Model Publication No. 06-77421

  However, the joint for a covered conduit tube as in Patent Document 1 has a problem that since it has a large number of parts, it takes time and labor to connect. In particular, the attachment of the tube body takes time since the joint body and the tightening nut are screwed together. Moreover, when the outer peripheral surface of a covered conduit is not smooth, there exists a problem that packing cannot follow the unevenness | corrugation of the outer peripheral surface of a covered conduit, and there exists a possibility that waterproofness may be inferior. In addition, the outer shape of the coated conduit may be deformed when it is cut or connected, and if the coated conduit is flexible, the outer shape of the coated conduit is completely near the bent portion of the coated conduit. Since it does not become a perfect circle, there is a possibility that a gap is formed between the packing and the covered electric wire tube. In this case, there is a problem that the waterproof property may be deteriorated.

  Similarly, the sealing body according to Patent Document 2 has a problem in that it takes time to mount the pipe body because the joint body and the tightening nut are screwed together. In addition, when the outer peripheral surface of the tube body is not smooth, the waterproof property is inferior, and there is a possibility that a gap is formed between the seal body and the tube body due to deformation of the outer shape when the tube body is cut or connected. In this case, there is a problem that the waterproof property may be inferior.

  The present invention has been made in view of such a problem, and has a superior waterproof property regardless of the unevenness of the outer peripheral surface of the tubular body, and a tubular joint, a tubular connection structure, and a tubular body that can be easily connected to the tubular body. An object is to provide a connection method.

  In order to achieve the above-described object, the first invention includes a cylindrical main body portion, an abutting portion provided in the main body portion and having an inner diameter reduced, and water provided in the abutting portion. An inflatable water stop member, and a holding portion that is provided in the main body portion and holds a corrugated tube having an independent wave. The water expandable water stop member is a ring-shaped urethane foam or rubber. A urethane foam or a water-absorbing non-woven fabric is stacked on the packing to form a ring shape, and the holding portion holds a plurality of valley portions of the corrugated tube along the inner periphery in the vicinity of the end portion of the main body portion. A claw portion and a tightening portion for tightening the claw portion in an inner circumferential direction, and one end portion of the holding portion is provided with a plurality of cuts in a cylindrical axis direction, and is provided on an inner surface of the tip portion. The claw part is provided, and the fastening part is completely connected to the main body part. When the corrugated tube is inserted from the front end side of the holding portion in a state of being embedded, the claw portion protrudes from the inner surface of the main body portion and is tapered so as not to become resistance to insertion of the corrugated tube. A claw shape that is hooked to the corrugated tube when the corrugated tube is removed, and a gap is formed between a portion of the tightening portion and the holding portion, and the tightening In a state in which the part is completely tightened to the main body part, the outer periphery of the claw part is pressed by the inner surface of the distal end of the tightening part, and the waved tube can be inserted and held, When the tightening portion is loosened, the gap is located on the outer periphery of the claw portion, and the claw portion is deformable in the outer peripheral direction so that the inserted wavy tube is removed. It is a joint.

  According to the first invention, since the water-expandable water-stopping member is provided at the abutting portion of the pipe joint, water can be stopped at the end of the pipe to be connected, and the water-stopping member is water. Since it has expansibility, it is possible to reliably waterproof the pipe joint. In particular, since the water is stopped at the end of the tube body, the water stoppage is not inferior even if the outer peripheral surface of the tube is uneven, and the water stoppage is inferior even if the outer shape of the tube is deformed. There is no.

  Further, if the water-swellable water-stopping member is urethane foam, the urethane foam is crushed by an extremely large deformation amount and stopped by the end of the pipe when the pipe is inserted into the pipe joint. For this reason, even when the cut surface of the end portion of the tubular body is uneven, the urethane foam is pressed while deforming following the unevenness of the end portion of the tubular body, so that water can be reliably stopped.

  In addition, when the tubular body is a corrugated tube, the corrugated tube and the pipe joint can be securely fixed to hold the corrugated portion of the corrugated tube by the plurality of claws, and the corrugated tube can be securely fixed. Since the corrugated pipe and the pipe joint are connected only by inserting the attached pipe into the pipe joint, connection of the pipe bodies is extremely easy.

  A pipe joint can be easily connected while securing waterproofness if a pair of pipes can be inserted from both sides and each pipe can be held. If the body is inserted and the other side can be attached to a peripheral member such as a wiring box or a switch box, the tubular body and the peripheral member can be easily connected while ensuring waterproofness.

  According to a second aspect of the present invention, a corrugated tube is inserted into the pipe joint according to the first aspect of the present invention, and the tip of the claw portion is the inner periphery of the main body when the tightening portion is completely tightened into the main body. When the corrugated tube is inserted, the tip of the claw portion is projected at the outer peripheral mountain portion of the corrugated tube. The end of the corrugated tube is pressed against the water-swellable water stop member provided in the abutting portion, and the water corrugated tube In the pipe connection structure, the corrugated pipe and the pipe joint are connected in a state where the inflatable water stop member is crushed.

  A protrusion on the outer periphery is provided on the other end of the holding part on the side where the claw part is provided, and a rib is provided in the inner peripheral direction inside the tightening part. In a state in which the rib is completely tightened, the rib may mesh with the protrusion, and the protrusion may be pressed by the tightening portion in the direction of the abutting portion.

  According to the second invention, since the water-expandable water stop member provided at the abutting portion of the pipe joint is crushed by the end of the pipe body, the pipe body and the pipe joint are connected. Even if the outer peripheral surface of the tube has irregularities, the water stoppage is not inferior, and even if the outer shape of the tube is deformed, the waterstop is not inferior. Furthermore, when the pipe body is inserted into the pipe joint, the water-expandable water-stopping member is crushed and stopped by the end part of the pipe body, so that the cut surface of the end part of the pipe body has irregularities. Even in this case, the water-swellable water-stopping member is pressed while deforming following the irregularities at the end of the tube body, so that water can be reliably stopped.

  According to the present invention, it is possible to provide a pipe joint, a pipe connection structure, and a pipe connection method that have excellent waterproofness regardless of the unevenness of the outer peripheral surface of the pipe body and that allow easy connection of the pipe body.

FIG. 2 is an exploded perspective view of the pipe joint 1. FIG. 3 is an assembly perspective view of the pipe joint 1. 1 is a cross-sectional view of a pipe joint 1. Sectional drawing of the state in which the corrugated pipe | tube 13 was inserted in the pipe joint 1. FIG. The disassembled perspective view of the pipe joint 30. FIG. The assembly perspective view of the pipe joint 301. FIG. Sectional drawing of the pipe joint 30. FIG. Sectional drawing of the state in which the corrugated pipe | tube 13 was inserted in the pipe joint 30. FIG. Sectional drawing of the pipe joint 40. FIG. Sectional drawing of the pipe joint 50. FIG. The figure which shows the waterproof test apparatus 60. FIG.

  Hereinafter, the pipe joint 1 concerning embodiment of this invention is demonstrated. FIG. 1 is an exploded perspective view of the pipe joint 1, and FIG. 2 is an assembled perspective view of the pipe joint 1.

  The pipe joint 1 mainly includes a main body 3, a packing 5, a chuck ring 7, a tightening portion 9, and the like. The main body 3 is a cylindrical member made of resin. Male screw portions 11 are provided at both ends of the main body 3. Details of the internal structure of the main body 3 will be described later.

  The packing 5 has a ring shape, and the outer diameter of the packing 5 is substantially the same as the inner diameter of the main body 3. The packing 5 is water-swellable and desirably has a large amount of deformation. For example, the packing 5 desirably has a thickness of 3 mm or more and a compression rate of 70% or more. If the thickness is 3 mm or more and the compression ratio is 70% or more, it is possible to easily follow the unevenness at the end of the tube when connecting the tube, and to easily set the packing 5 and insert the tube. Become. The packing 5 is preferably, for example, urethane foam. In this case, the packing 5 can be deformed extremely greatly. As the material of the packing 5, it is desirable to use a urethane foam alone, in addition to this, it is desirable to use a neoprene rubber sponge with a urethane foam or a neoprene rubber sponge with a water absorbent non-woven fabric. The effect of can be obtained. As described above, when the packing 5 is composed of two materials and is formed in two stages, a normal rubber packing is used instead of the neoprene rubber sponge, and urethane foam or a water-absorbing non-woven fabric is overlapped thereon. You can also. In this case, it is better to attach and fix the two materials. However, the two materials are not necessarily fixed, but may be simply stacked, or may be stacked and urethane foam or a water-absorbing non-woven fabric may be simply inserted into the rubber packing.

  The chuck ring 7 is a cylindrical resin member and has flexibility. A plurality of cuts are provided in one end portion of the chuck ring 7 in the cylindrical axis direction. The inner shape of the chuck ring 7 is substantially the same as the inner diameter of the main body 3. The details of the shape of the chuck ring 7 will be described later.

  The tightening portion 9 is a cylindrical member, and a female screw portion 12 is provided inside. The female screw portion 12 can be screwed with the male screw portion 11. Therefore, as shown in FIG. 2, when the pipe joint 1 is assembled, the tightening portions 9 a and 9 b are attached to both ends of the main body 3. Packings 5a and 5b and chuck rings 7a and 7b are accommodated in the pipe joint 1, respectively. The corrugated pipes 13a and 13b, which are tubular bodies, are inserted and connected to the fastening portions 9a and 9b at both ends of the pipe joint 1 and the internal chuck rings 7a and 7b.

  Next, the internal structure of the pipe joint 1 and the connection structure of the corrugated pipe 13 by the pipe joint 1 will be described. FIG. 3 is a cross-sectional view of the pipe joint 1 in an assembled state.

  In the inside of the cylindrical main body 3, an abutting portion 23 is provided at substantially the center in the axial direction of the main body 3. The abutting portion 23 is a portion where the inner diameter of the main body 3 is reduced. When the corrugated pipe 13 is inserted into the pipe joint 1, the end of the corrugated pipe 13 abuts against the abutting portion. That is, the inner diameter of the pipe joint 1 is smaller than the outer diameter of the corrugated pipe 13 to be connected, and the inner diameter of the abutting portion 23 is smaller than the outer diameter of the corrugated pipe 13. Moreover, it is desirable that the inner diameter of the abutting portion 23 is larger than the inner diameter of the corrugated tube 13 because the electric wire or the like is not caught by the abutting portion 23 when the electric wire or the like is inserted therein.

  On both sides of the abutting portion 23, packings 5a and 5b are provided, respectively. The packing 5 is bonded and fixed to the abutting portion 23 in advance with an adhesive or the like. In this case, for example, a double-sided tape may be attached in advance to one side of the packing 5 and bonded to the abutting portion 23. Since the outer diameter of the packing 5 is sufficiently larger than the inner diameter of the abutting portion 23, the packing 5 is not pushed beyond the abutting portion 23.

  Chuck rings 7 a and 7 b that are holding portions of the corrugated tube 13 are set on both ends of the main body 3. There are a plurality of cuts at one end of the chuck ring 7, and a plurality of holding claws 15 are provided at the tip of the chuck ring 7 in the inner circumferential direction. The holding claw 15 has a taper shape that hardly resists insertion of the corrugated tube 13 when the corrugated tube 13 is inserted from the tip side of the chuck ring 7, and when the corrugated tube 13 is removed. Has a claw shape to be caught by the corrugated tube 13.

  A protrusion 21 is provided on the outer periphery at the other end of the chuck ring 7 where the holding claw 15 is provided. The protrusion 21 is a part that is pressed down by the tightening portion 9.

  The tightening portion 9 is joined by the male screw portion 11 of the main body 3 and the female screw portion 12 of the tightening portion 9. A rib 19 is provided inside the tightening portion 9 in the inner circumferential direction. The rib 19 meshes with the protrusion 21 of the chuck ring 7 and presses the chuck ring 7 in the direction of the main body 3 when the fastening portion 9 is fastened and joined to the main body 3.

  A gap 17 is formed between the chuck ring 7 and the rib 19 of the tightening portion 9 and the tip portion. In the state where the tightening portion 9 is completely tightened to the main body 3, the outer periphery of the tip of the chuck ring 7 is pressed by the inner surface of the front end of the tightening portion 9, so that the deformation of the holding claws 15 in the outer peripheral direction is suppressed. Therefore, the holding claw 15 reliably holds the corrugated tube 13. On the other hand, when the tightening portion 9 is loosened, the gap 17 is located on the outer periphery of the holding claw 15, so that the holding claw 15 can be easily deformed in the outer peripheral direction, and the corrugated tube 13 can be removed.

  FIG. 4 is a view showing a state where the corrugated pipes 13 a and 13 b are inserted into the pipe joint 1. The corrugated pipe 13a is inserted into the pipe joint 1 (in the direction of arrow A in the figure). When the corrugated tube 13 a is inserted, the corrugated tube 13 a can be inserted without being caught by the retaining claws 15 due to the tapered shape of the retaining claws 15.

  The corrugated pipe 13b is in a state of being completely inserted and held in the pipe joint 1. In this state, the packing 5b is crushed at the tip of the corrugated tube 13b. Since the packing 5b has a very large amount of deformation, the packing 5b can follow the shape of the tip of the corrugated tube 13b and can reliably stop water. In this state, the holding claw 15 is caught over the entire circumference of the valley portion 25 of the corrugated tube 13 b, and the corrugated tube 13 b does not come out of the pipe joint 1.

  As described above, according to the pipe joint 1 according to the first embodiment, the corrugated pipes 13 can be easily connected to each other while ensuring waterproofness. Moreover, since the packing 5 has water expandability and can be deformed extremely greatly, it is possible to reliably obtain waterproofness. In particular, even when the corrugated tube 13 is cut at the connection site and there is a large unevenness on the cut surface, the packing 5 can follow the unevenness, and thus high waterproofness can be ensured. .

  The packing 5 is provided at the abutting portion 23, and the corrugated tube 13 comes into contact with the packing 5 at the end of the corrugated tube 13, and the packing 5 is pressed and deformed. For this reason, waterproofness can be reliably obtained irrespective of the uneven shape of the outer periphery of the corrugated tube 13. Furthermore, even when the outer shape of the corrugated tube 13 is deformed and the roundness of the corrugated tube 13 is deteriorated, it can be reliably waterproofed.

  In particular, unlike Patent Document 1 and Patent Document 2, since a water stop member or the like is not provided between the outer periphery of the corrugated tube 13 and the inner peripheral surface of the main body 3, the corrugated tube 13 is stopped when inserted. The insertion property of the corrugated pipe 13 is not affected by the water member or the like, and the corrugated pipe 13 can be easily inserted into the pipe joint 1. Further, when the corrugated tube 13 is inserted, the water stop member does not slide with respect to the inner peripheral surface of the main body 3, and the water stop member is not turned up or damaged.

  Further, the pipe joint 1 is provided with a plurality of holding claws 15, and when the corrugated pipe 13 is inserted, the corrugated pipe 13 can be inserted with one touch. To the pipe joint 1. Therefore, the pair of corrugated tubes 13 can be joined very easily without attaching packing or the like to the corrugated tube 13 each time.

  Next, the pipe joint 30 according to the second embodiment will be described. In the following embodiment, the same number as FIG. 1-4 is attached | subjected to the component which performs the same function as the pipe joint 1 shown in FIGS. 1-4, and the overlapping description is avoided. Although the pipe joint 30 concerning 2nd Embodiment is the structure substantially the same as the pipe joint 1, it differs by the following point. That is, the pipe joint 30 differs from the pipe joint 1 in that a male thread part 31 and a flange 33 are provided at one end.

  FIG. 5 is an exploded perspective view of the pipe joint 30, and FIG. 6 is an assembled perspective view of the pipe joint 30. The pipe joint 30 mainly includes a main body 3a, a packing 5, a chuck ring 7, a tightening portion 9, a nut 35, and the like.

  The main body 3a is a cylindrical member, and has a male screw portion 11 that can be joined to the tightening portion 9 at one end portion. In the vicinity of the other end of the main body 3a, a flange 33 projecting in the outer circumferential direction is provided over the entire circumference. A male screw portion 31 is provided at the end of the main body 3a. The male screw portion 31 can be screwed with the nut 35.

  The cap 37 can be inserted into the male screw portion 31 and prevents moisture, pride, and the like from entering the male screw portion 31.

  As shown in FIG. 6, the corrugated tube 13 is inserted into the tightening portion 9 and the chuck ring 7. The other male screw portion 31 is inserted into a wall body 39 of a peripheral member such as a wiring box or a switch box, and is fixed by a nut 35 from the opposite side of the wall body 39. Therefore, the corrugated tube 13 is connected to the wall body 39.

  FIG. 7 is a cross-sectional view of the pipe joint 30 in an assembled state. An abutting portion 23 is provided on the inner surface of the main body 3a near the flange 33. The packing 5 is provided on the tightening portion 9 side of the abutting portion 23.

  The wall 39 is provided with a hole into which the male screw portion 31 can be inserted in advance. Since the diameter of the hole is smaller than that of the flange 33, the pipe joint 30 contacts the wall body 39 and the flange 33. A nut 35 is joined to the male screw portion 31 from the opposite surface side of the wall body 39. Therefore, the pipe joint 30 is sandwiched and fixed to the wall body 39 by the nut 35 and the flange 33. A cap 37 is provided inside the male screw portion 31. The cap 37 is removed when an electric wire or the like is inserted into the pipe joint 30.

  In addition, it is desirable that the inner diameter of the male screw portion 31 is larger than the inner diameter of the corrugated tube 13 inserted into the pipe joint 30 because the electric wire or the like is not caught inside the male screw portion 31 when the electric wire or the like is inserted therein. . Further, if a water-stopping member such as packing is provided between the wall body 39 and the flange 33, the waterproof property can be ensured more reliably.

  FIG. 8 is a view showing a state where the corrugated pipe 13 is inserted into the pipe joint 30. When the corrugated pipe 13 is completely inserted into the pipe joint 30, the packing 5 is crushed at the end of the corrugated pipe 13. At this time, the corrugated tube 13 is held by the holding claws 15.

  According to the pipe joint 30 concerning 2nd Embodiment, the effect similar to the pipe joint 1 concerning 1st Embodiment can be acquired. In addition, the corrugated tube 13 can be easily connected to a peripheral box such as a wiring box or a switch box while ensuring the waterproof property of the corrugated tube 13.

  The waterproof performance of the pipe joint 1 according to the present invention and the conventional pipe joints 40 and 50 were compared. FIG. 9 shows a conventional pipe joint 40, and FIG. 10 shows a conventional pipe joint 50.

  The pipe joint 40 is a pipe joint that connects metal pipes 49a and 49b such as steel pipes. In the pipe joint 40, an abutting portion 43 having an inner diameter reduced is provided. Grooves 45 a and 45 b are provided in the circumferential direction on the inner peripheral surfaces on both sides of the abutting portion 43. The grooves 45a and 45b are provided with packings 41a and 41b, respectively. The packings 41a and 41b have a T-shaped cross section, and a part protrudes from the inner surface of the pipe joint 40.

  When the metal pipes 49a and 49b are inserted from both sides of the pipe joint 40 and inserted into the abutting portions 43, the outer peripheral surfaces of the metal pipes 49a and 49b come into contact with the packings 41a and 41b to be waterproofed. The metal tubes 49 a and 49 b are fixed by bolts 47, and the metal tubes 49 a and 49 b are fixed to the pipe joint 40.

  On the other hand, the pipe joint 50 is a pipe joint that connects the corrugated pipes 57a and 57b. In the pipe joint 50, an abutting portion 53 having a reduced inner diameter is provided. O-rings 51a and 51b are provided in advance near the ends of the corrugated tubes 57a and 57b to be inserted.

  When the corrugated pipes 57a and 57b are inserted from both sides of the pipe joint 50 and inserted into the abutment portion 53, the outer peripheral surfaces of the corrugated pipes 57a and 57b are waterproofed by O-rings 51a and 51b. The corrugated tubes 57 a and 57 b are fixed by tightening a not-shown holding member with a bolt or the like in the tightening hole 55, and the corrugated tubes 57 a and 57 b are fixed to the pipe joint 40.

  Next, a waterproof test method will be described. The waterproof test was conducted in accordance with JIS C0920: 2003 “Protection class by the outer shell of an electric machine”.

The protection grade (hereinafter simply referred to as “IP code”) defined by JIS C0920: 2003 is defined as IPX0 to IPX8 as a test indicating waterproof performance. For example, IPX5 (jet test) uses a water discharge nozzle with a nozzle diameter of 6.3 mm to discharge 12.5 L of water per minute from a distance of 2.5 to 3 m, The infiltration of water after 1 minute (minimum 3 minutes) per 1 m ³ of the surface area of the outer shell is confirmed.

Similarly, IPX6 (turbulent jet test) discharges 100 L of water per minute from a distance of 2.5 to 3 m using a water discharge nozzle with a nozzle diameter of 12.5 mm over the entire circumference of the test body. The infiltration of water after 1 minute (minimum 3 minutes) per 1 m ³ of the surface area of the outer shell is confirmed.

  Since the IP code is a more severe test as the numerical value is larger, it can be said that a pipe joint having a larger IP code (a pipe joint that has passed the larger IPX test) has higher waterproofness. This time, tests of IPX5-7 defined in JIS C0920: 2003 were carried out in each pipe joint.

  FIG. 11 is a diagram showing a waterproof test apparatus 60 corresponding to IPX7 (temporary diving test) as an example. The waterproof test device 60 includes a water tank 65, a weight plate 67, water 71, and the like. The test method is as follows.

  First, the weight plate 67 is installed inside the water tank 65. A wire 69 is previously installed on the weight plate 67. The test body (pipe joints 1, 40, 50) is fixed to the weight plate 67 with a wire 69 so as not to float on water. The pipe bodies 63a and 63b (the corrugated pipes 13a and 13b, the metal pipes 49a and 49b, the corrugated pipes 57a and 57b) connected to the test body 61 are extended above the water tank 65, and the ends of the pipe bodies 63a and 63b are extended. Remove from tank 65. In this state, water 71 was poured into the water tank 65 so that the depth B would be 1 m, and a 30-minute waterproof test was performed. After the test, the test body 61 was taken out and water penetration into the inside was confirmed. The test results are shown in Table 1.

  It can be seen that the pipe joint 1 according to the present invention does not intrude water even in the IPX7 test and has extremely high waterproof performance.

  On the other hand, as for the pipe joint 40, the penetration | invasion of water was confirmed in the IPX7 test. This is because the packing 41a, 41b is not completely in close contact with the metal tubes 49a, 49b due to sliding between the packings 41a, 41b and the metal tubes 49a, 49b when the metal tubes 49a, 49b are inserted, or the metal tubes 49a , 49b, the metal tubes 49a, 49b are displaced from the center of the pipe joint 40, and the adhesiveness of the packings 41a, 41b becomes non-uniform.

  The pipe joint 50 was also confirmed to have water intrusion in the IPX6 test. This is because when the corrugated tubes 57a and 57b are inserted, the O-rings 51a and 51b are displaced, and the adhesion between the O-rings 51a and 51b and the corrugated tubes 57a and 57b is deteriorated, or the corrugated tube 57a. , 57b due to deformation of the outer shape of the O-rings 51a, 51b and the corrugated tubes 57a, 57b.

  It can be seen that the pipe joint 1 according to the present invention can be reliably waterproofed even if the pipe body is a corrugated pipe, and has extremely high waterproofness.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, the pipe joint 1 can be used for connecting a metal pipe or the like according to a bolt or the like instead of the holding claw 15.

1, 30, 40, 50 ............ Fitting 3, 3 a ............ Main body 5 ............ Packing 7 ............ Chuck ring 9 ............ Tightening part 11 ............ Male thread part 12 ............ ...... Wavy tube 15 ......... Holding claw 17 ......... Gap 19 ......... Rib 21 ......... Protrusion 23 ......... Abutting part 25 ......... Valley part 31 ......... Male thread part 33 ......... Flange 35 ......... Nut 37 ......... Cap 39 ......... Wall bodies 41a, 41b ......... Packing 43 ......... Abutting portions 45a, 45b ......... Groove 47 ......... Bolts 49a, 49b ......... Metal tubes 51a, 51b ......... O-ring 53 ......... Tightening portion 55 ......... Clamping portion 57a, 57b ...... Wavy tube 60 ......... Waterproof test device 61 ......... Test bodies 63a, 63b ......... Tube Body 65 ......... Water tank 67 ......... Weight plate 69 ......... Wire 71 ......... Water

Claims (4)

A cylindrical body,
An abutting portion provided inside the main body and having an inner diameter reduced;
A water-swellable water-stopping member provided in the abutting portion;
A holding part that is attached to the main body part and holds a corrugated tube having an independent wave;
Comprising
The water-stop member is a ring-shaped urethane foam or rubber packing that is formed in a ring shape by overlapping urethane foam or a water-absorbing nonwoven fabric,
The holding part is
Along the inner periphery in the vicinity of the end of the holding portion, there are a plurality of claw portions that hold the trough portion of the corrugated tube, and a tightening portion that tightens the claw portion in the inner circumferential direction.
A plurality of cuts are provided in the cylindrical axial direction at one end of the holding part, and the claw part is provided on the inner surface of the tip part,
When the corrugated tube is inserted from the front end side of the holding portion in a state where the tightening portion is completely tightened to the main body portion, the claw portion protrudes from the inner surface of the holding portion and the corrugated portion It has a taper shape so that it is difficult to become resistance to insertion of the tube, and when the waved tube is removed, it is a claw shape that is caught by the waved tube,
A gap is formed in a part between the tightening portion and the outer peripheral surface of the claw portion, and when the tightening portion is completely tightened to the main body portion, the outer periphery of the claw portion is the tightening portion. It is possible to insert the corrugated tube and hold the corrugated tube, and when the tightening portion is loosened, the gap is positioned on the outer periphery of the claw portion. And the said nail | claw part will be in the removal state of the said corrugated pipe | tube inserted so that it can deform | transform in the outer peripheral direction, The pipe joint characterized by the above-mentioned. A corrugated pipe is inserted into the pipe joint according to claim 1,
With the tightening portion fully tightened to the main body portion, the tip of the claw portion protrudes to the inner peripheral side of the holding portion so as to be smaller than the diameter of the outer peripheral side peak portion of the corrugated tube, When the attached tube is inserted, it is possible to keep the protrusion at the tip of the claw portion to be smaller than the diameter of the outer peripheral ridge of the corrugated tube,
The end portion of the corrugated tube is pressed against the water-swellable water stop member provided at the abutting portion,
The pipe connection structure, wherein the corrugated pipe and the pipe joint are connected in a state where the water-expandable water stop member is crushed by the corrugated pipe. On the other end of the holding portion on which the claw portion is provided, a protrusion is provided on the outer periphery.
A rib is provided inside the tightening portion in the inner circumferential direction,
The rib is engaged with the protrusion in a state where the tightening portion is completely tightened to the main body, and the protrusion is pressed by the tightening portion in the direction of the main body. The pipe connection structure described. A pipe connection method using the pipe joint according to claim 1,
The fastening part is completely fastened to the main body part, and the tip of the claw part is protruded to the inner peripheral side of the holding part so as to be smaller than the diameter of the outer peripheral side peak part of the corrugated tube to be inserted. In the state, insert the corrugated tube into the holding part,
A tube connection method, wherein the corrugated tube is held by the claw portion in a state where the corrugated tube is completely inserted.

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