JP6580022B2 - Cable gland - Google Patents

Description

  The present invention relates to a cable gland for holding a cable.

  A technique for holding a cable via a cable gland attached to a casing or the like of the electric device when connecting the cable to the electric device is known (for example, see Patent Document 1).

  For example, as shown in FIG. 8, the cable gland is a cylindrical member into which the cable C can be inserted. The gland body 202 has male flanges 222 a and 223 a formed on both sides of the flange 221 and the flange 221. , A sleeve 203 fitted into the ground body 202, a cap (cap nut) 204 to be screwed into a male screw 222 a on one side (side into which the sleeve 203 is fitted) of the ground body 202, and a lock for fixing the ground body 202 to the wall body 100. A nut 206 and the like are provided.

  In such a cable gland 201, the male screw 223a on the other side of the ground main body 202 is inserted into the mounting hole 101 formed in the wall body 100 of the casing of the electric device, and a lock nut is attached to the male screw 223a on the other side. The ground body 202 is attached to the wall body 100 by screwing 206. Thereafter, the sleeve 203 is fitted into the ground body 202 with the cable C inserted into the insertion hole 203a of the sleeve 203, and the cap 204 is screwed into the male screw 222a on one side of the ground body 202 to tighten the sleeve 203. By tightening the sleeve 203 with the cap 204 in this way, the sleeve 203 is deformed in the diameter reducing direction, and the inner peripheral surface of the insertion hole 203 a of the sleeve 203 and the outer peripheral surface of the cable C are brought into close contact with each other. As a result, water, oil, dust, dust, etc. can be prevented from entering the housing of the electric device, and the cable C itself can be firmly held and fixed.

JP 2007-37364 A

  Incidentally, in the cable gland 201 shown in FIG. 8, when high-pressure water jet is received, water may be generated in the cable gland 201.

  More specifically, when high pressure water jet is received from the front side of the sleeve 203, first, the peripheral portion of the contact portion between the sleeve 203 and the cable C (the portion A2 shown in FIG. 8 (the inner portion of the periphery of the opening 204a of the cap 204). )) Is filled with water, and when high pressure is applied to the portion filled with water by high-pressure water jet, high water pressure acts on the contact portion between the sleeve 203 and the cable C, and the sleeve 203 and the cable C In some cases, water may enter the cable gland 201 (inside the casing) from the contact portion.

  The present invention has been made in consideration of such circumstances, and in a cable gland having a gland main body, a sleeve through which the cable is inserted, and a cap for fastening the sleeve, the inside of the gland cable from the contact portion between the sleeve and the cable. An object of the present invention is to provide a structure capable of preventing the occurrence of water in the water.

  The present invention is a cylindrical member into which a cable can be inserted, and has a cylindrical cable holding portion, and a ground body in which an external thread is formed on the outer peripheral surface of the cable holding portion, and an insertion hole through which the cable passes. A cylindrical sleeve fitted into the cable holding portion of the ground body, and a cap formed with a female screw that meshes with a male screw of the cable holding portion of the ground body, and the cable holding portion of the ground body includes the cap It is premised on a cable gland that deforms the sleeve in the diameter-reducing direction by screwing the cap into the male screw of the cable holding portion in a state where the sleeve is fitted.

  In such a cable gland, the cap has a cylindrical peripheral wall portion in which the female screw is formed, and a front wall portion integrally formed at one end of the peripheral wall portion, and a cable is connected to the front wall portion of the cap. An opening hole is formed, and a groove-like bypass passage extending from the periphery of the opening hole of the front wall portion to the other end of the peripheral wall portion is formed in the inner wall of the cap.

  According to the cable gland of the present invention, a groove-like bypass passage extending from the periphery of the opening hole of the front wall portion to the other end of the peripheral wall portion is formed on the inner wall of the cap. ), The inner portion (A1 portion in FIG. 7) of the periphery of the opening hole of the cap, that is, the peripheral portion of the contact portion between the sleeve and the cable, and the other end side outside of the peripheral wall portion of the cap are communicated with each other. A communication path is formed. As a result, even if high pressure water jet is received from the front side of the cap and pressure is applied to the inner part of the periphery of the opening hole of the cap, the pressure is transferred to the outside of the other end of the cap (outside of the cable gland) through the communication path. I can escape. As a result, the pressure acting on the contact portion between the sleeve and the cable can be reduced, and water can be prevented from being generated in the ground cable from the contact portion between the sleeve and the cable.

  According to the present invention, in a cable gland provided with a gland main body, a sleeve through which the cable is inserted, and a cap for tightening the sleeve, water is prevented from being generated in the ground cable from the contact portion between the sleeve and the cable. Can do.

It is a longitudinal cross-sectional view which shows an example of the cable gland of this invention. It is a longitudinal cross-sectional view which shows an example of the cable gland of this invention. FIG. 2 shows a state where the sleeve and the sleeve collet are deformed in the diameter reducing direction by tightening the cap. FIG. 2 is an exploded perspective view of the cable gland in FIG. 1. It is sectional drawing of a cap. It is a perspective view of a cap. It is a rear view of a cap. It is a principal part expanded sectional view of the cable gland of FIG. It is a semi-longitudinal sectional view showing an example of a conventional cable gland.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  An example of the cable gland according to the present invention will be described with reference to FIGS.

  The cable gland 1 includes a gland body 2, a sleeve 3, a cap 4, a packing 5, a lock nut 6, a sleeve collet 7, and the like.

  The ground body 2 is a substantially cylindrical member (for example, made of resin), and a substantially hexagonal flange 21 is formed at the center in the axial direction (axial direction of the cylinder). Cylindrical cable holding portions 22 and attachment portions 23 are formed on both sides (both sides in the axial direction).

  A male screw 22 a is formed on the outer peripheral surface of the cable holding portion 22. A male screw 23 a is formed on the outer peripheral surface of the attachment portion 23. The attachment portion 23 is inserted into an attachment hole 101 formed in the wall body 100 of the casing of the electric device (hereinafter also referred to as the wall body 100 of the electric device).

  In the following description, the cable holding portion 22 side (cap 4 side of the cable gland 1) of the ground body 2 is referred to as a front side, and the opposite side is referred to as a rear side.

  An insertion hole (through hole) 24 for inserting a cable is formed in the ground body 2 along the axial direction. The insertion hole 24 is a stepped hole, and in the middle of the insertion hole 24 in the axial direction (in the cable holding portion 22), a cone for pressing a sleeve 3 described later inwardly (in the direction of reduced diameter). A tapered surface 24b is formed, and a cable holding hole 24a is formed on the front side of the tapered surface 24b. The conical tapered surface 24b is a tapered surface whose diameter decreases toward the rear side. Then, a sleeve 3 and a sleeve collet 7 described later are fitted into the cable holding hole 24a.

  The sleeve 3 is a cylindrical member made of rubber, for example, and includes a cylindrical portion 31 and a flange 32, and the cylindrical portion 31 and the flange 32 are integrally formed. The flange 32 is an annular outer flange that protrudes outward from the peripheral edge of the end portion on the rear side of the cylindrical portion 31 (the end portion on the conical tapered surface 24b side of the cable holding portion 22). The sleeve 3 is formed with an insertion hole (through hole) 3a through which the cable C passes along the axial direction. The axial length of the sleeve 3 is a length that protrudes a predetermined amount from the end portion (front end portion) of the ground body 2 in a state where the sleeve 3 is fitted in the cable holding hole 24 a of the ground body 2. ing.

  The cap 4 is a cap nut-like member (for example, made of resin) having a cylindrical peripheral wall portion 41 having an approximately hexagonal outer peripheral surface and a front wall portion 42 that covers the front side of the peripheral wall portion 41. A female screw 41 a that meshes with the male screw 22 a of the cable holding portion 22 of the ground body 2 is formed on the inner peripheral surface of the peripheral wall portion 41 of the cap 4. In the center of the front wall portion 42 of the cap 4, a circular opening hole 42 a for passing the cable C is formed. The inner diameter of the opening hole 42 a is smaller than the outer diameter of the front end face of the sleeve 3 and the outer diameter of the sleeve collet 7.

  Six bypass passages 43... 43 are formed in the inner wall of the cap 4. As shown in FIG. 6, these bypass passages 43... 43 are disposed at positions that are 60 ° rotationally symmetric with respect to the central axis CL (center of the circular opening hole 42 a) CL of the cap 4. Each bypass passage 43 is a groove-like passage extending from the peripheral edge 42 b of the opening hole 42 a of the front wall portion 42 to the other end 41 b of the peripheral wall portion 41.

  The groove bottom surface 43a (see FIG. 5 and the like) of the bypass passage 43 is formed so as to be positioned on the outer side in the radial direction from the bottom of the thread of the female screw 41a of the peripheral wall portion 41. As a result, as shown in FIG. 7, in the state where the cap 4 is screwed into the male screw 22a of the gland main body 2 (cable holding portion 22), the thread bottom of the groove bottom surface 43a of the bypass passage 43 and the male screw 22a of the cable holding portion 22 A predetermined gap S is formed between the top and the top.

  The packing 5 is an annular member (for example, made of rubber) having a circular hole 5a, and is sandwiched between the flange portion 21 of the ground body 2 and the wall body 100 of the electric device (see FIGS. 1 and 2). . The inner diameter of the packing 5 (the diameter of the circular hole 5a) is substantially equal to the outer diameter of the male screw 23a of the mounting portion 23 of the gland body 2.

  The lock nut 6 is a nut (for example, made of resin) for fixing the ground main body 2 to the wall body 100 of the electric device, and is formed with a female screw 6 a that meshes with the male screw 23 a of the mounting portion 23 of the ground main body 2.

  The sleeve collet 7 is attached to the sleeve 3. The sleeve collet 7 is a thin member made of a synthetic resin (for example, nylon or polyamide) having toughness and high lubricity. The sleeve collet 7 has a cylindrical portion 71 and a flange 72 formed in a cylindrical shape surrounding the sleeve 3 (cylindrical portion 31), and the cylindrical portion 71 and the flange 72 are integrally formed. The flange 72 is an annular inner flange that protrudes inward from the peripheral edge of the end portion on the front side of the cylindrical portion 71 (the end portion opposite to the opening side of the slit 73a). The inner diameter of the cylindrical portion 71 of the sleeve collet 7 corresponds to the outer diameter of the cylindrical portion 31 of the sleeve 3, and the cylindrical portion 71 of the sleeve collet 7 can be fitted in a state of being in close contact with the cylindrical portion 31 of the sleeve 3. it can.

  The cylindrical portion 71 of the sleeve collet 7 has a portion extending from the middle of the cylindrical portion 71 in the axial direction to the end on the rear side along the axial direction (the end on the conical tapered surface 24b side of the cable holding portion 22). A plurality of (strip 12) slits 73a... 73a extending in a uniform width are formed. The slits 73a and 73a are arranged rotationally symmetrically about the cylindrical axis of the sleeve collet 7. Each slit 73 a is open at the end of the cylindrical portion 71. Hereinafter, a portion where the slits 73a... 73a are formed is referred to as a slit forming portion 73.

  Next, a procedure for attaching the cable gland 1 having the above structure will be described with reference to FIGS.

  (S1) First, the sleeve 3, the cap 4, the packing 5, the lock nut 6, and the sleeve collet 7 are disassembled from the gland body 2.

  (S2) The packing 5 is fitted into the mounting portion 23 of the ground body 2, and the mounting portion 23 is inserted into the mounting hole 101 of the wall body 100 of the electric device from the front side of the wall body 100 (the front side of the casing of the electronic device).

  (S3) By screwing the lock nut 6 into the male screw 23a of the mounting portion 23 of the ground body 2 inserted into the mounting hole 101 of the wall body 100 (the male screw 23a protruding from the back side of the wall body 100), the ground body 2 Is attached (fixed) to the wall body 100.

  (S4) The sleeve collet 7 is attached to the outer peripheral portion of the sleeve 3, and the sleeve 3 and the sleeve collet 7 are inserted into the cable holding hole 24a of the ground body 2 in a state where the cable C is passed through the sleeve 3 and the cap 4. The sleeve collet 7 is fitted with the end portion on the opening side of the slit 73a facing the conical tapered surface 24b.

  (S5) The cap 4 is screwed into the ground body 2 by aligning the female thread 41a of the cap 4 with the male thread 22a of the cable holding portion 22 of the ground body 2. In the screwing process of the cap 4, the sleeve collet 7 is pressed rearward by the cap 4, and the rear end portion of the sleeve 3 is pressed by the conical tapered surface 24 b of the ground body 2. As a result, the sleeve 3 is deformed in the diameter reducing direction, and the slit forming portion 73 of the sleeve collet 7 is also deformed in the diameter reducing direction (see FIG. 2). Then, the inner peripheral surface of the insertion hole 3 a of the sleeve 3 and the outer peripheral surface of the cable C are in close contact with each other in a state where the screwing (tightening) of the cap 4 is completed. As a result, it is possible to prevent dust and dirt from entering the housing of the electric device, and to firmly hold and fix the cable C itself.

  Further, in a state where the screwing (tightening) of the cap 4 is completed, one end of each end of the cap 4 on the inner side of the peripheral edge 42b of the opening hole 42a of the cap 4 (periphery of the contact portion between the sleeve 3 and the cable C) Part: A communication path P (a part of which is provided with a dot pattern in FIG. 7) is formed which communicates with the part A1 in FIG. 7 and communicates with the other end 41b of the peripheral wall 41 at the other end.

<Effect>
As described above, according to the cable gland 1 of the present embodiment, the sleeve collet 7 is configured to be interposed between the cap 4 and the sleeve 3 when the cap 4 is screwed into the male screw 22 a of the ground body 2. Yes. With such a configuration, in the process of tightening the cap 4, the cap 4 and the sleeve 3 are not in direct contact with each other, and the cap 4 and the sleeve collet 7 slide and rotate, so that the sleeve 3 is released from the frictional force in the twisting direction. The As a result, the pressing force acting on the sleeve 3 is made uniform in the circumferential direction of the sleeve 3, so that the sleeve 3 is appropriately reduced in diameter.

  Moreover, since the outer peripheral portion of the sleeve 3 is surrounded by the sleeve collet 7, the deformation of the sleeve 3 to the radially outer side is limited. Accordingly, when the sleeve 3 is deformed by tightening the cap 4, it is possible to prevent the deformation of the sleeve 3 from escaping radially outward. Therefore, the airtightness / liquid tightness of the sleeve 3 and the holding force of the cable C can be reduced. It becomes possible to ensure more reliably.

  Furthermore, in the cable gland 1 of this embodiment, a groove-like bypass passage 43 extending from the peripheral edge 42b of the opening hole 42a of the front wall portion 42 to the other end 41b of the peripheral wall portion 41 is formed on the inner wall of the cap 4. Therefore, in a state where the cap 4 is screwed into the male screw 22a of the ground body 2 (cable holding portion 22), the inner portion (A1 portion in FIG. 7) of the peripheral edge 42b of the opening hole 42a of the cap 4, that is, the sleeve 3 and the cable C A communication path P (see FIG. 7) that connects the peripheral portion of the contact portion and the outside on the other end 41 b side of the peripheral wall portion 41 of the cap 4 is formed.

  By forming such a communication path P, even if high pressure water jet is received from the front side of the cap 4 and pressure is applied to the inner portion of the peripheral edge 42b of the opening hole 42a, the pressure is passed through the communication path P to the cap. 4, the pressure acting on the contact portion between the sleeve 3 and the cable C can be reduced, and the contact between the sleeve 3 and the cable C can be reduced. It is possible to prevent water from entering the cable gland 1 from the portion.

-IP69K test-
When the IP69K test was performed on the cable gland 1 of the present embodiment, it was confirmed that the protection class defined by IP69K was satisfied.

  IP69K is a grade related to a protective structure defined in DIN 40050 PART9 of German Industrial Standard (DIN: Deutsche Industry Normen). IP69K stipulates that “dust does not enter the interior of solid foreign matters” and “water is not adversely affected even in high temperature, high water pressure, steam jet cleaning environments”. .

<IP69K test method>
Water of 80 ° C. is discharged from the flat jet nozzle having a specified shape onto the specimen at a water pressure of 80 to 100 bar (bar). The amount of water is 14-16 liters / minute. The interval between the specimen and the nozzle is 10 to 15 cm, and the direction of water discharge is 0, 30, 60, and 90 degrees with respect to the horizontal direction. Each specimen is rotated for 30 seconds on the horizontal plane. To do.

-Other embodiments-
In addition, embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of the claims.

  For example, in the above embodiment, the number of bypass passages formed in the cap 4 is six, but the present invention is not limited to this, and the number of bypass passages may be any number other than six. Good. Further, the groove width / shape of the bypass passage 43 is not limited to the groove width / shape shown in FIG.

  In the above embodiment, the number of slits 73a of the sleeve collet 7 is 12. However, the present invention is not limited to this, and the number of slits may be any number other than 12. .

  In the above embodiment, the sleeve 3 is attached with the sleeve collet 7. However, the present invention is not limited to this and can be applied to a cable gland that does not include the sleeve collet.

  In the present invention, the cross-sectional structure and the like of the members constituting the cable gland can be appropriately modified within a range that does not affect the connection between the sleeve and the cap. The number and thickness of the insertion holes formed in the sleeve are not limited to the above embodiment.

  In addition, the cable gland of the present invention is not only used for power distribution and communication cables, but also for protecting electric wires without a sheath (sheath), protective pipes for accommodating electric wires, pipes for sending fluids, etc. Therefore, the “cable” in the present invention includes those wires and pipes.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for a cable gland used when holding a cable in an electric device or the like.

DESCRIPTION OF SYMBOLS 1 Cable gland 2 Ground main body 22 Cable holding part 22a Male screw 3 Sleeve 3a Insertion hole 4 Cap 41 Peripheral wall part 41a Female screw 41b Other end of a peripheral wall part 42 Front wall part 42a Opening hole 42b Opening hole periphery 43 Bypass passage 43a Groove bottom face 5 Packing 6 Lock nut

Claims (1)

A cylindrical member through which a cable can be inserted, having a cylindrical cable holding portion, and a ground body in which a male screw is formed on the outer peripheral surface of the cable holding portion,
A cylindrical sleeve having an insertion hole for passing a cable, and fitted into the cable holding portion of the ground body;
A cap formed with an internal thread that meshes with the external thread of the cable holding portion of the ground body, and
In the cable gland in which the sleeve is deformed in the diameter-reducing direction by screwing the cap into the male screw of the cable holding part in a state where the sleeve is fitted in the cable holding part of the gland body,
The cap has a cylindrical peripheral wall portion in which the female screw is formed, and a front wall portion integrally formed at one end of the peripheral wall portion,
An opening hole for passing a cable is formed in the front wall portion of the cap, and a groove-like bypass passage extending from the peripheral edge of the opening hole in the front wall portion to the other end of the peripheral wall portion is formed in the inner wall of the cap. A cable gland characterized by

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