JP6298347B2 - Waterproof packing for conduit connector and conduit connector having the same - Google Patents

Description

  The present invention relates to a waterproof packing for a conduit connector attached to a conduit connector and a conduit connector including the same.

  In order to protect the electric wires, the electric wires may be accommodated in the conduit. The conduit can be connected to another conduit using a conduit connector such as a coupling, or can be connected to an attachment position using a conduit connector such as a connector. A conduit connector such as a coupling or a connector is usually provided with a waterproof packing for preventing water from entering the conduit connector (see, for example, Patent Document 1 below).

  As exemplified in Patent Document 1, the waterproof packing is generally attached to the end face of the conduit connector. This type of waterproof packing is made of an elastic body such as rubber. For example, an annular cylindrical portion attached to the end face of the conduit connector and a radially inner side (center axis side) projecting from the end face of the cylindrical portion. The lip is integrally formed.

  When attaching the conduit to the conduit connector, the conduit is inserted into the cylindrical portion of the waterproof packing, and the lip is elastically laid down by the conduit. At this time, the lip is in a collapsed state until it is parallel to the axial direction of the cylindrical portion, and the collapsed state is maintained until the conduit is subsequently removed.

Japanese Patent No. 3509805

  As described above, when the lip is maintained for a long time in a lying state, the lip remains in a deformed state after the conduit is removed, and so-called familiar deformation may occur. In this case, there is a problem that the airtightness between the lip and the electric conduit is lowered, and the waterproof property cannot be guaranteed for a long time.

  On the other hand, the present inventor does not attach the waterproof packing to the end face of the conduit fitting, but attaches the waterproof packing along the inner surface of the conduit fitting, from the viewpoint of the mounting property of the waterproof packing, etc. The structure which accommodates waterproof packing in a pipe connector was considered. However, in the case of such a configuration, due to the outer periphery of the waterproof packing being covered with the conduit connector, the cylindrical portion is not easily elastically deformed, and the lip fitting deformation is absorbed by the cylindrical portion. In particular, it is easy for deformation to occur.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a waterproof packing for a conduit connector and a conduit connector including the same, which is less likely to cause deformation.

  A waterproof packing for a conduit connector according to the present invention is a waterproof packing for a conduit connector attached to a conduit connector, and includes an annular tube portion, an annular first lip, and a lip receiving portion. Is provided. The said cylinder part is attached along the inner surface of the said conduit connector, and a conduit is inserted along an axial direction. The first lip protrudes from the inner surface of the cylindrical portion and is elastically tilted by the conduit tube inserted into the cylindrical portion. The lip receiving portion is provided in the cylindrical portion, and receives the first lip inclined by the conduit inserted into the cylindrical portion at an angle inclined with respect to the axial direction.

  According to such a configuration, the first lip tilted by the conduit tube inserted into the cylindrical portion is received by the lip receiving portion at an angle inclined with respect to the axial direction of the cylindrical portion. That is, the first lip is not tilted down until it is parallel to the axial direction of the cylindrical portion, but is maintained in a tilted state. Therefore, even when the first lip is maintained in a tilted state for a long time, unlike the case where the first lip is maintained in a lying state for a long time, the first lip is not easily deformed.

  In particular, in the present invention, since the tube portion is attached along the inner surface of the conduit connector, the tube portion is not easily elastically deformed, and the conforming deformation of the first lip protruding from the inner surface of the tube portion is caused by the tube portion. It is difficult to absorb. Even in such a configuration, since the lip receiving portion receives the first lip in an inclined state as described above, the conforming deformation of the first lip can be absorbed by the lip receiving portion. It is possible to effectively prevent the familiar deformation.

  The first lip is preferably tapered toward the tip.

  According to such a configuration, even if the first lip is not completely laid down and is tilted by being received by the lip receiving portion, the first lip has a tapered shape. The first lip can be favorably retracted from the region where the conduit is inserted. Thereby, when inserting a conduit tube in a cylinder part, a 1st lip becomes difficult to become resistance, and a conduit tube can be inserted smoothly.

  The first lip is orthogonal to the axial direction, and a front surface with which the conduit tube inserted into the cylinder portion abuts, and an inclined surface with respect to the front surface and the conduit tube inserted into the cylinder portion. Preferably, the first lip has a rear surface received by the lip receiving portion when tilted.

  With such a configuration, the first lip can be elastically deformed satisfactorily by bringing the conduit tube into contact with the front surface orthogonal to the axial direction of the cylindrical portion. Further, since the rear surface of the first lip is inclined with respect to the front surface, even when the first lip is tilted and received by the lip receiving portion, the first lip is elastically deformed with a sufficient amount of deformation. be able to. Therefore, it can prevent that the airtightness between a 1st lip and an electric wire pipe falls.

  It is preferable that the lip receiving portion is constituted by an inclined surface formed on the inner surface of the cylindrical portion so as to be gradually recessed toward the rear surface side of the first lip.

  According to such a configuration, the first lip can be received in an inclined state by the inclined surface formed on the inner surface of the cylindrical portion. At this time, since the inclined surface is formed so as to be gradually depressed toward the rear surface side of the first lip, the rear surface of the first lip can be satisfactorily received by the inclined surface from the root portion. Thereby, the conforming deformation of the first lip can be satisfactorily absorbed by the inclined surface, so that the conforming deformation of the first lip can be more effectively prevented.

  It is preferable that the waterproof packing for a conduit connector further includes an annular second lip. The second lip protrudes from the inner surface of the cylindrical portion at a position spaced from the first lip toward the front side in the insertion direction of the conduit tube, and is elastically formed by the conduit tube inserted into the cylindrical portion. I will be surrendered. The first lip protrudes from the inner surface of the cylindrical portion than the second lip.

  According to such a structure, since not only a 1st lip but a 2nd lip can be made to contact | abut with respect to the conduit tube inserted in a cylinder part, airtightness improves further. In particular, since the first lip protrudes from the inner surface of the cylindrical portion than the second lip, the airtightness is higher, but the conforming deformation is likely to occur. Even in such a configuration, since the first lip is received by the lip receiving portion in a tilted state, it is possible to effectively prevent the conforming deformation, thereby improving both airtightness and preventing the conforming deformation. Can be made.

  The conduit connector according to the present invention includes the waterproof packing for the conduit connector and a main body on which the waterproof packing for the conduit connector is attached along the inner surface.

  According to the present invention, the first lip tilted by the conduit inserted into the tube portion is received by the lip receiving portion at an angle inclined with respect to the axial direction of the tube portion. Hard to occur.

It is the perspective view which showed the structural example of the waterproof packing which concerns on one Embodiment of this invention. It is the perspective view which showed 1st Example of the conduit connector to which the waterproof packing of FIG. 1 was applied. It is sectional drawing of the conduit connector of FIG. 2A. It is the perspective view which showed 2nd Example of the conduit connector to which the waterproof packing of FIG. 1 was applied. It is sectional drawing of the conduit connector of FIG. 3A. It is the perspective view which showed 3rd Example of the conduit connector to which the waterproof packing of FIG. 1 was applied. It is sectional drawing of the conduit connector of FIG. 4A. It is sectional drawing of the waterproof packing of FIG. 1, and has shown the state by which the conduit tube is not inserted. It is sectional drawing of the waterproof packing of FIG. 1, and has shown the state in which the electric wire pipe was inserted.

  FIG. 1 is a perspective view showing a configuration example of a waterproof packing 1 according to an embodiment of the present invention. The waterproof packing 1 is attached to a conduit connector to which a conduit is connected, and prevents water from entering the conduit connector. The waterproof packing 1 is integrally formed of an elastic body such as rubber. Examples of the rubber include, but are not limited to, ethylene propylene rubber excellent in weather resistance and water resistance.

  The waterproof packing 1 is provided with, for example, a cylinder portion 10, a first lip 11, a second lip 12, a lip receiving portion 13, and the like. The cylinder part 10 is formed in the annular | circular shape, and the annular recessed part 14 is formed in the outer peripheral surface. By locking the concave portion 14 on the inner surface of the conduit connector, the tube portion 10 can be attached along the inner surface of the conduit connector.

  The first lip 11 protrudes from the inner surface at the central portion of the cylindrical portion 10 and is formed in an annular shape along the circumferential direction of the cylindrical portion 10. On the other hand, the second lip 12 protrudes from the inner surface at one end of the cylindrical portion 10, and is formed in an annular shape along the circumferential direction of the cylindrical portion 10, similarly to the first lip 11. The first lip 11 and the second lip 12 are formed at positions spaced apart so as not to contact each other when they are elastically deformed.

  The conduit tube is inserted into the tube portion 10 of the waterproof packing 1 accommodated in the conduit connector by being inserted into the conduit connector. More specifically, the conduit tube is inserted from the second lip 12 side to the first lip 11 side along the axial direction D1 of the cylindrical portion 10. In this way, the second lip 12 is formed at a position spaced from the first lip 11 on the front side in the conduit insertion direction (axial direction D1).

  The lip receiving portion 13 is provided on the side opposite to the second lip 12 side with respect to the first lip 11 in the cylindrical portion 10. The lip receiving portion 13 is provided at a position that can be contacted when the first lip 11 is elastically deformed, and can receive the first lip 11 that is elastically deformed with the insertion of the conduit.

  FIG. 2A is a perspective view showing a first embodiment of a conduit connector 100 to which the waterproof packing 1 of FIG. 1 is applied. Moreover, FIG. 2B is sectional drawing of the conduit connector 100 of FIG. 2A. The conduit connector 100 according to the first embodiment is a coupling for connecting two conduits, and more specifically, for connecting different types of conduits.

  The conduit connector 100 includes a waterproof packing 1 in a cylindrical main body 101. An insertion port 102 for inserting a conduit tube is formed on one end surface of the main body 101, and the waterproof packing 1 is attached along the inner surface of the main body 101 in the vicinity of the insertion port 102. An annular convex portion 103 having a shape corresponding to the concave portion 14 of the waterproof packing 1 is formed on the inner surface of the main body 101. When the convex portion 103 is fitted into the concave portion 14 of the waterproof packing 1, the waterproof packing 1 Is locked in the main body 101.

  The waterproof packing 1 is disposed so that the end on the second lip 12 side is close to the insertion port 102. The insertion port 102 has a larger diameter than the opening formed by the distal end edge of the second lip 12 and is set to be larger than the maximum diameter of the conduit applied to the conduit connector 100. On the other hand, the first lip 11 and the second lip 12 are set to project with respect to the inner surface of the cylindrical portion 10 so as to come into contact with the conduit when the conduit applied to the conduit connector 100 is inserted. . As a result, the conduit tube inserted into the conduit connector 100 comes into contact with the second lip 12 and the first lip 11 in this order, and the lip portions 11 and 12 are elastically deformed, and the cylindrical portion 10 It will be inserted inside.

  As shown in FIG. 2A, a portion of the main body 101 near the attachment position of the waterproof packing 1 is formed thick. An annular recess 104 having the same width as the width of the waterproof packing 1 in the axial direction D1 is formed on the inner surface of the main body 101 in the thick portion (see FIG. 2B). A portion 103 is formed. Thereby, the waterproof packing 1 is accommodated in the recessed part 104 formed in the thick part of the main body 101, and the waterproof packing 1 is attached in a state where the first lip 11 and the second lip 12 protrude from the inner surface of the main body 101. Can do.

  In the main body 101, a through hole 105 is formed in a thin portion on the center side (the side opposite to the insertion port 102 side) from the attachment position of the waterproof packing 1. A thread groove is formed in the inner peripheral surface of the through hole 105, and a screw (not shown) is screwed into the through hole 105, and the tip of the screw is inserted into the outer peripheral surface of the conduit tube inserted into the main body 101. By pressing, the conduit can be fixed.

  A cylindrical rib 106 is provided around the through hole 105 on the outer peripheral surface of the main body 101 so as to protrude, and the periphery of the head of the screw screwed into the through hole 105 is surrounded by the rib 106. it can. As shown in FIG. 2A, other ribs 107 may be appropriately provided in the thin portion of the main body 101.

  In this example, only one through-hole 105 is formed in the main body 101, but two or more through-holes 105 are formed, and an electric wire inserted into the main body 101 by a screw screwed into each through-hole 105. A configuration in which the tube is fixed may be used. In this case, a cylindrical rib 106 is provided around each through hole 105 on the outer peripheral surface of the main body 101, and the periphery of the head of the screw screwed into each through hole 105 is surrounded by each rib 106. It may be a simple configuration.

  A threaded tube portion 108 is formed at the end of the main body 101 opposite to the insertion port 102 side. A screw thread is formed on the outer peripheral surface of the threaded pipe portion 108, and a cap nut (not shown) is screwed into the threaded pipe section 108 to connect the two conduits. For example, the conduit tube inserted from the insertion port 102 into the main body 101 is a steel tube, and the conduit tube attached to the main body 101 while being inserted through the cap nut is a resin-made flexible conduit tube. However, the material of each conduit is not limited to these, and conduits formed of other various materials can be used.

  FIG. 3A is a perspective view showing a second embodiment of a conduit connector 200 to which the waterproof packing 1 of FIG. 1 is applied. Moreover, FIG. 3B is sectional drawing of the conduit connector 200 of FIG. 3A. The conduit connector 200 according to the second embodiment is a connector for attaching the conduit to an attachment position such as a wiring box.

  The conduit connector 200 includes a waterproof packing 1 in a cylindrical main body 201. An insertion port 202 for inserting a conduit tube is formed on one end surface of the main body 201, and the waterproof packing 1 is attached along the inner surface of the main body 201 in the vicinity of the insertion port 202. An annular convex portion 203 having a shape corresponding to the concave portion 14 of the waterproof packing 1 is formed on the inner surface of the main body 201. When the convex portion 203 is fitted into the concave portion 14 of the waterproof packing 1, the waterproof packing 1 Is locked in the main body 201.

  The waterproof packing 1 is disposed so that the end on the second lip 12 side is close to the insertion port 202. The insertion port 202 has a larger diameter than the opening formed by the distal end edge of the second lip 12 and is set to be larger than the maximum diameter of the conduit applied to the conduit connector 200. On the other hand, the first lip 11 and the second lip 12 are set to project with respect to the inner surface of the cylindrical portion 10 so as to come into contact with the conduit when the conduit applied to the conduit connector 200 is inserted. . Thereby, the conduit tube inserted into the conduit connector 200 is in contact with the second lip 12 and the first lip 11 in this order, and the lip portions 11 and 12 are elastically deformed, and the cylindrical portion 10 It will be inserted inside.

  As shown to FIG. 3A, the part of the main body 201 near the attachment position of the waterproof packing 1 is formed thick. An annular recess 204 having the same width as the width of the waterproof packing 1 in the axial direction D1 is formed on the inner surface of the main body 201 in the thick wall portion (see FIG. 3B). A portion 203 is formed. Thereby, the waterproof packing 1 is accommodated in the recessed part 204 formed in the thick part of the main body 201, and the waterproof packing 1 is attached in a state where the first lip 11 and the second lip 12 protrude from the inner surface of the main body 201. Can do.

  In the main body 201, a through hole 205 is formed in a thin portion on the center side (the side opposite to the insertion port 202 side) from the attachment position of the waterproof packing 1. A thread groove is formed on the inner peripheral surface of the through hole 205, and a screw (not shown) is screwed into the through hole 205, and the tip of the screw is inserted into the outer peripheral surface of the conduit tube inserted into the main body 201. By pressing, the conduit can be fixed.

  A cylindrical rib 206 is provided around the through hole 205 on the outer peripheral surface of the main body 201 so as to protrude from the periphery of the head of the screw screwed into the through hole 205. it can. As shown in FIG. 3A, other ribs 207 may be appropriately provided in the thin portion of the main body 201. Further, a screw hole 209 that does not penetrate the main body 201 is formed in a thin portion of the main body 201 in the vicinity of the through hole 205, and a ground screw (not shown) is screwed into the screw hole 209.

  In this example, only one through hole 205 is formed in the main body 201, but two or more through holes 205 are formed, and the electric wires inserted into the main body 201 by screws screwed into the respective through holes 205. A configuration in which the tube is fixed may be used. In this case, a cylindrical rib 206 is provided around each through-hole 205 on the outer peripheral surface of the main body 201 so that the periphery of the head of the screw screwed into each through-hole 205 is surrounded by each rib 206. It may be a simple configuration.

  A screw tube portion 208 is formed at the end of the main body 201 opposite to the insertion port 202 side. A screw thread is formed on the outer peripheral surface of the screw tube portion 208, and an annular seat packing 210 is provided along the outer peripheral surface of the root portion of the screw tube portion 208. A lock nut 211 is screwed into the threaded pipe portion 208 from the distal end side. When attaching the conduit connector 200 to the wiring box, the screw tube portion 208 is inserted into the wiring box, and the lock nut 211 is screwed into the screw tube portion 208, whereby the lock nut 211 and the seat packing 210 are connected. The side plate of the wiring box is sandwiched between and fixed.

  For example, the conduit tube inserted from the insertion port 202 into the main body 201 is a steel tube. However, the material of the conduit is not limited to this, and conduits formed of other various materials can be used.

  FIG. 4A is a perspective view showing a third embodiment of a conduit connector 300 to which the waterproof packing 1 of FIG. 1 is applied. 4B is a cross-sectional view of the conduit connector 300 of FIG. 4A. The conduit connector 300 according to the third embodiment is a coupling for connecting two conduits, and more specifically, for connecting the same kind of conduits.

  The conduit connector 300 includes a waterproof packing 1 in a cylindrical main body 301. Insertion ports 302 for inserting conduits are respectively formed at both end surfaces of the main body 301, and the waterproof packing 1 is attached along the inner surface of the main body 301 in the vicinity of each insertion port 302. An annular convex portion 303 having a shape corresponding to the concave portion 14 of the waterproof packing 1 is formed on the inner surface of both ends of the main body 301, and each convex portion 303 is fitted into the concave portion 14 of the waterproof packing 1. Each waterproof packing 1 is locked in the main body 301.

  Each waterproof packing 1 is arranged so that the end on the second lip 12 side is close to the insertion port 302. Each insertion port 302 has a larger diameter than the opening formed by the distal end edge of the second lip 12 and is set to be larger than the maximum diameter of the conduit applied to the conduit connector 300. On the other hand, the first lip 11 and the second lip 12 are set to have a protruding amount with respect to the inner surface of the cylindrical portion 10 so as to come into contact with the conduit when the conduit applied to the conduit connector 300 is inserted. . Thereby, the conduits inserted from both ends into the conduit connector 300 are in contact with the second lip 12 and the first lip 11 in this order, and the lips 11 and 12 are elastically deformed. It will be inserted into the cylinder part 10.

  As shown to FIG. 4A, the part of the main body 301 near the attachment position of each waterproof packing 1 is formed thick. An annular recess 304 having the same width as that of the waterproof packing 1 in the axial direction D1 is formed on the inner surface of the main body 301 in these thick portions (see FIG. 4B), and a part of the bottom surface of each recess 304 is formed. The convex portion 303 is formed. Accordingly, the waterproof packing 1 is accommodated in the recess 304 formed in the thick part of the main body 301, and the waterproof packing 1 is attached in a state where the first lip 11 and the second lip 12 protrude from the inner surface of the main body 301. Can do.

  In the main body 301, through holes 305 are formed in thin portions on the center side (the side opposite to the insertion port 302 side) from the attachment position of each waterproof packing 1. A thread groove is formed on the inner peripheral surface of each through-hole 305. Screws (not shown) are screwed into the respective through-holes 305, and the tips of these screws are inserted into the main body 301. Each conduit can be fixed by pressing against the outer peripheral surface.

  Cylindrical ribs 306 are provided around the through holes 305 on the outer peripheral surface of the main body 301 so as to project around the heads of the screws screwed into the through holes 305. be able to. As shown in FIG. 4A, other ribs 307 may be appropriately provided in the thin portion of the main body 301.

  In this example, only two through holes 305 are formed in the main body 301, but three or more through holes 305 are formed, and each screw inserted into the main body 301 is screwed into each through hole 305. It may be configured such that the conduit is fixed. In this case, a cylindrical rib 306 is provided around each through hole 305 on the outer peripheral surface of the main body 301, and the periphery of the head of the screw screwed into each through hole 305 is surrounded by each rib 306. It may be a simple configuration.

  As shown in FIG. 4B, an annular recess 308 for accommodating the intermediate packing 2 on the same axis as each waterproof packing 1 is formed on the inner surface of the central portion of the main body 301. The intermediate packing 2 has a configuration in which an annular cylindrical portion 21 into which a conduit is inserted along the axial direction D1 and an intermediate lip 22 protruding from the inner surface of the cylindrical portion 21 are integrally formed. Similarly to the waterproof packing 1, the intermediate packing 2 can be formed of an elastic body such as rubber exemplified by ethylene propylene rubber. However, the intermediate packing 2 is not limited to the same material as the waterproof packing 1, and may be formed of a different material.

  A portion in the vicinity of the attachment position of the intermediate packing 2 in the main body 301 is formed thick, and an annular shape having the same width as the width in the axial direction D1 of the intermediate packing 2 is formed on the inner surface of the main body 301 in the thick portion. A recess 308 is formed. The intermediate packing 2 is attached in a state where the intermediate lip 22 protrudes from the inner surface of the main body 301 by being locked in the recessed portion 308 while the intermediate packing 2 is fitted.

  The two conduits inserted from the respective insertion ports 302 are arranged in the main body 301 with their end faces butting each other. In this state, the end surfaces of the two conduits are located at the center of the main body 301, and the gap between the end surfaces is sealed by the annular intermediate packing 2 provided along the inner surface of the center.

  For example, the electric pipes inserted from the respective insertion ports 302 into the main body 301 are steel pipes. However, the material of the conduit is not limited to this, and conduits formed of other various materials can be used.

  FIG. 5A is a cross-sectional view of the waterproof packing 1 of FIG. 1 and shows a state where the conduit 3 is not inserted. FIG. 5B is a cross-sectional view of the waterproof packing 1 of FIG. 1 and shows a state in which the conduit 3 is inserted. Below, the specific structure of the waterproof packing 1 is demonstrated.

  As shown in FIG. 5A, the first lip 11 of the waterproof packing 1 according to this embodiment has a shape that tapers toward the tip. More specifically, the first lip 11 includes a front surface 111 on the front side in the insertion direction of the conduit 3 (second lip 12 side) and a rear surface 112 on the rear side in the insertion direction of the conduit 3 (lip receiving portion 13 side). And have.

  The front surface 111 of the first lip 11 extends along a radial direction D2 orthogonal to the axial direction D1 of the cylindrical portion 10. After the end face of the conduit 3 inserted into the cylinder portion 10 from the second lip 12 side abuts against the front surface 111 of the first lip 11, the conduit pipe 3 is further inserted into the rear side so that the outer peripheral surface is The first lip 11 is elastically tilted while being in sliding contact with the front surface 111.

  The rear surface 112 of the first lip 11 is inclined with respect to the front surface 111. The front surface 111 and the rear surface 112 are connected by a smooth curved surface at the tip. The inclination angle θ1 of the rear surface 112 with respect to the front surface 111 is preferably 10 to 20 °, more preferably 14 to 18 °, and even more preferably about 16 °.

  When the first lip 11 is tilted by the conduit 3 inserted into the cylindrical portion 10, the rear surface 112 of the first lip 11 is received by the lip receiving portion 13 as shown in FIG. 5B. The lip receiving portion 13 is formed of, for example, an inclined surface formed on the inner surface of the cylindrical portion 10, and is formed adjacent to the first lip 11 on the rear side in the insertion direction of the conduit 3. In this example, the inclined surface as the lip receiving portion 13 is gradually depressed with respect to the first lip 11 from the rear side in the insertion direction of the conduit 3 toward the front side in the insertion direction (the rear surface 112 side of the first lip 11). It is formed in such a way.

  The inclination angle θ2 of the lip receiving portion 13 with respect to the axial direction D1 is preferably 10 to 20 °, more preferably 11 to 15 °, and further preferably about 13 °. In addition, the inclination angle θ3 between the lip receiving portion 13 and the rear surface 112 of the first lip 11 is preferably about 90 °. As shown in FIG. 5B, the first lip 11 tilted by the conduit 3 inserted into the cylindrical portion 10 of the waterproof packing 1 has an angle at which the rear surface 112 is inclined with respect to the axial direction D1 of the cylindrical portion 10. It is received by the lip receiving portion 13.

  That is, it is not tilted down until the rear surface 112 of the first lip 11 is parallel to the axial direction D1 of the cylindrical portion 10, but is maintained in a tilted state. Therefore, even when the first lip 11 is maintained in a tilted state for a long time, unlike the case where the first lip 11 is maintained in a lying state for a long time, the first lip 11 is not easily deformed.

  In particular, in this embodiment, since the cylinder part 10 is attached along the inner surface of the conduit connector 100, 200, 300, the cylinder part 10 is hardly elastically deformed and protrudes from the inner surface of the cylinder part 10. It is difficult for the cylindrical portion 10 to absorb the conforming deformation of the one lip 11. Even in such a configuration, the lip receiving portion 13 absorbs the conforming deformation of the first lip 11 by the lip receiving portion 13 receiving the rear surface 112 of the first lip 11 in an inclined state as described above. Therefore, it is possible to effectively prevent the first lip 11 from being deformed.

  Further, in the present embodiment, the first lip 11 has a tapered shape even when the first lip 11 is not completely laid down and is tilted by the rear surface 112 being received by the lip receiving portion 13. Therefore, as shown in FIG. 5B, the first lip 11 can be satisfactorily retracted from the region in the tubular portion 10 where the conduit 3 is inserted. Thereby, when inserting the conduit 3 in the cylinder part 10, the 1st lip 11 becomes difficult to become resistance, and the conduit 3 can be inserted smoothly.

  In particular, in the present embodiment, the first lip 11 can be elastically deformed satisfactorily by bringing the conduit 3 into contact with the front surface 111 orthogonal to the axial direction D1 of the cylindrical portion 10. Further, since the rear surface 112 of the first lip 11 is inclined with respect to the front surface 111, even when the first lip 11 is received by the lip receiving portion 13 in a tilted state, the first lip 11 is sufficiently deformed. The lip 11 can be elastically deformed. Therefore, it is possible to prevent the airtightness between the first lip 11 and the conduit 3 from being lowered.

  Furthermore, in this embodiment, the rear surface 112 of the first lip 11 can be received in an inclined state by the inclined surface (lip receiving portion 13) formed on the inner surface of the cylindrical portion 10. At this time, since the inclined surface is formed so as to be gradually recessed toward the rear surface 112 side of the first lip 11, the rear surface 112 of the first lip 11 can be satisfactorily received by the inclined surface from the root portion. Accordingly, the conforming deformation of the first lip 11 can be satisfactorily absorbed by the inclined surface, so that the conforming deformation of the first lip 11 can be more effectively prevented.

  As described above, the first lip 11 is received by the lip receiving portion 13 in a tilted state, whereas the second lip 12 is elasticized by the conduit 3 inserted into the cylindrical portion 10 as shown in FIG. 5B. Will be overturned and bent 90 degrees. The front surface 121 and the rear surface 122 of the second lip 12 both extend along a radial direction D2 orthogonal to the axial direction D1. The first lip 11 and the second lip 12 are set to have different protrusion amounts, and the first lip 11 protrudes from the inner surface of the cylindrical portion 10 rather than the second lip 12.

  In the present embodiment, since not only the first lip 11 but also the second lip 12 can be brought into contact with the conduit 3 inserted into the cylindrical portion 10, the airtightness is further improved. In particular, since the first lip 11 protrudes from the inner surface of the cylindrical portion 10 than the second lip 12, the airtightness is higher, but the conforming deformation is likely to occur. Even in such a configuration, since the rear surface 112 of the first lip 11 is received by the lip receiving portion 13 in a tilted state, it is possible to effectively prevent the conforming deformation from occurring and to improve the airtightness. It is possible to achieve both prevention of deformation.

  In the above embodiment, the configuration in which the front surface 111 of the first lip 11 extends along the radial direction D2 and the rear surface 112 is inclined with respect to the front surface 111 has been described. However, the configuration is not limited to this, and for example, both the front surface 111 and the rear surface 112 may be inclined with respect to the radial direction D2, and the front surface 111 and the rear surface 112 are both radial in the radial direction like the second lip 12. It may extend along D2.

  The lip receiving portion 13 is not limited to the inclined surface as in the above embodiment, and any other shape can be used as long as it can receive the first lip 11 at an angle inclined with respect to the axial direction D1. Can be adopted.

  The second lip 12 may be formed in a shape different from that of the above embodiment or may be omitted. The waterproof packing 1 may further include another lip different from the second lip 12.

  The waterproof packing 1 according to the present invention is not limited to the coupling shown in FIGS. 2A and 2B, the connector shown in FIGS. 3A and 3B, or the coupling shown in FIGS. 4A and 4B. Applicable to tubes.

DESCRIPTION OF SYMBOLS 1 Waterproof packing 2 Intermediate packing 3 Conduit tube 10 Cylinder part 11 1st lip 12 2nd lip 13 Lip receiving part 14 Recessed part 21 Cylinder part 22 Intermediate lip 100 Conduit connector 101 Main body 102 Insertion port 103 Convex part 104 Concave part 105 Through-hole 106 Rib 107 Rib 108 Pipe part 111 Front face 112 Rear face 121 Front face 122 Rear face 200 Conduit connector 201 Main body 202 Insertion port 203 Convex part 204 Concave 205 Through hole 206 Rib 207 Rib 208 Pipe part 209 Screw hole 210 Sheet packing 211 Lock nut 300 Conduit connector 301 Main body 302 Insertion port 303 Convex part 304 Concave part 305 Through hole 306 Rib 307 Rib 308 Concave part D1 Axial direction D2 Radial direction

Claims (6)

A waterproof packing for conduit fittings attached to conduit fittings,
An annular cylindrical portion that is attached along the inner surface of the conduit connector and into which the conduit is inserted along the axial direction;
An annular first lip that protrudes from the inner surface of the cylindrical portion and is elastically tilted by the conduit inserted into the cylindrical portion;
A lip receiving portion provided in the cylindrical portion and configured to contact and receive the first lip inclined by the conduit inserted into the cylindrical portion at an angle inclined with respect to the axial direction. Features waterproof packing for conduit fittings.   The waterproof packing for a conduit connector according to claim 1, wherein the first lip has a shape tapered toward the tip. The first lip is
A front surface that is orthogonal to the axial direction and in contact with the conduit that is inserted into the cylindrical portion;
3. A rear surface that is inclined with respect to the front surface and is received by the lip receiving portion when the first lip is inclined by the conduit tube inserted into the cylindrical portion. Waterproof packing for conduit fittings.   4. The conduit connection according to claim 3, wherein the lip receiving portion is configured by an inclined surface formed on an inner surface of the cylindrical portion so as to be gradually recessed toward a rear surface side of the first lip. Waterproof packing for equipment. An annular shape that protrudes from the inner surface of the cylindrical portion at a position spaced in front of the first lip in the insertion direction of the conduit, and is elastically laid down by the conduit inserted into the cylindrical portion. A second lip,
The waterproof packing for a conduit connector according to any one of claims 1 to 4, wherein the first lip protrudes from the inner surface of the cylindrical portion rather than the second lip. The waterproof packing for a conduit connector according to any one of claims 1 to 5,
A conduit connector comprising: a main body to which the waterproof packing for conduit connector is attached along the inner surface.

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