JPH03838Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is directed to the terminal treatment section of a corrugated steel pipe armored cable in which a corrugated steel pipe and an anticorrosive layer are sequentially provided on the outer periphery of the cable core, and in particular, to fixing the anticorrosion layer in such a terminal treatment section. Regarding the department.

The anti-corrosion layer fixing section of the terminal processing section has the function of fixing the anti-corrosion layer of the cable and aligning the cable and the metal fitting. If alignment is incomplete,
The alignment needs to be done very precisely because the sealing in the annular elastic packing in the fitting will be insufficient and the desired waterproof or explosion-proof effect will not be ensured. A conventional anti-corrosion layer fixing section of the end treatment section will be explained with reference to FIGS. 1 and 2. A cap nut 1 as a type of metal fitting has a bag portion 5 formed on its inner circumferential surface and a female thread 4 screwed into a male screw 3 formed on the outer circumferential surface of the end of an external metal fitting 2, and a bag nut 1 in the axial direction. It has a semicircular part 6 adjacent to the part 5. An annular elastic packing 8 fitted to the outer periphery of the anti-corrosion layer 7 of the corrugated steel pipe armored cable has a tapered outer circumferential surface and is disposed radially inward of the tapered inner circumferential surface of the external fitting 2. Cap nut 1 to external metal fitting 2
By screwing, the annular elastic packing 8 is pushed in the axial direction along the tapered inner circumference of the external metal fitting 2 via the washer, expands radially inward, and comes into close contact with the anticorrosion layer 7.

The rotation prevention screw 9 is provided in the bag portion 5 to prevent relative rotation between the bag nut 1 and the external metal fitting 2. The anticorrosion layer 7 is applied with a clamp 10 at one half of its outer periphery, and is pressed against the inner periphery of the semicircular contour of the semicircular portion 6 by a screw 11 . In such a conventional terminal processing part, a semicircular inner peripheral contour is defined, and the anticorrosion layer 7 of the cable is attached to the semicircular part 6 by the clamp 10.
Since the anti-corrosion layer 7 is pressed against the inner circumference of the semicircular part 6, if the outer diameter of the anti-corrosion layer 7 deviates even slightly from the standard one, the center of the anti-corrosion layer 7 will be aligned with the center of the inner circumference of the semi-circular part 6. The annular elastic packing 8 may be misaligned and the sealing of the annular elastic packing 8 may be impaired.

The purpose of this invention is to align the center of the cable anti-corrosion layer with the center of the metal fittings even if the outer diameter of the corrugated steel pipe armored cable is slightly different, so that the seal will not be hindered, and to make the cable anti-corrosion layer compatible with cables of various diameters. A common abutting member can be used.

An object of the present invention is to provide a terminal treatment section for a corrugated steel pipe armored cable.

In order to achieve this object, according to the present invention, in the terminal treatment part of a corrugated steel pipe armored cable in which a corrugated steel pipe and an anti-corrosion layer are sequentially provided on the outer periphery of the cable core, a pair of backing members are provided with corrugations. It has a mountain-shaped receiving part that receives the anti-corrosion layer of the steel pipe armored cable, and screw penetration parts provided at both ends of the mountain-shaped receiving part, and this pair of abutment members apply symmetrically to the anti-corrosion layer. A tightening screw passing through the metal fittings tightens mutually opposing screw penetration portions of the pair of abutment members.

An embodiment of the present invention will be described with reference to the drawings. In Fig. 3, a corrugated steel pipe armored cable 15
A corrugated steel pipe 17 and an anti-corrosion layer 18 covering the corrugated steel pipe 17 are sequentially provided around the outer periphery of the central cable core 16, and the cable core 16 and the corrugated steel pipe 17 are separated longitudinally by being separated at the end. A predetermined amount is exposed in each direction. The main body fitting 19 is
It has a boss part 21 having a male thread 20 formed on its outer periphery, and the boss part 21 passes through a partition wall 22 of the terminal box and is tightened with a double nut 23 from inside the terminal box. Furthermore, a circular packing 25 is arranged on the facing surface of the main body fitting 19 and the partition wall 22. On the inner periphery of the flange portion 24 of the main body fitting 19,
Recess 26 with an inner diameter larger than the outer diameter of the cable core 16
is provided and an annular elastic packing 27 is placed within this recess 26. The recess 26 has a cylindrical side surface formed with a female thread 28 and a receiving part 29 that receives the annular elastic packing 27 in the axial direction, and the receiving part 29 is rounded with respect to a conventional vertical surface. . The fixing fitting 30 has a boss portion 32 formed on the outer periphery with a male thread 31 that is screwed into the female thread 28 of the main body fitting 19, and the tip of the boss portion 32 is connected to the washer 3.
3 through the annular elastic packing 27 receiving part 29
It acts as a pressing portion 48 that presses the shaft in the axial direction. When the main body fitting 19 and the fixing fitting 30 are screwed together, the annular elastic packing 27 is pressed against the receiving part 29 in the axial direction by the pressing part 48, and the outer peripheral surface of the annular elastic packing 27 moves along the radius of the receiving part 29. As a result, the annular elastic packing 27 is constricted, the inner peripheral edge 38 of the annular elastic packing 27 protrudes radially inward, and the annular elastic packing 27 tightly adheres to the outer periphery of the cable core 16. The seal by the annular elastic packing 27 is
Prevents flame propagation in the event of an explosion within the terminal box. The fixing fitting 30 is located astride the exposed cable core 16 and the corrugated steel pipe 17, and is provided with tightening screws 36 and 37 that press the annular members 34 and 35 radially inward. There is. The annular members 34 and 35 are made of thin copper plates that are bent in a circle so as to overlap by a predetermined amount in the circumferential direction, and are fitted around the outer periphery of the cable core 16 and the corrugated steel pipe 17, respectively. A plurality of tightening screws 36 and 37 (for example, two or four) are provided at equal angular intervals in the circumferential direction. By changing the amount of protrusion of the tightening screws 36, 37, the amount of overlap in the circumferential direction of the annular members 34, 35 is changed, and the inner diameters of the annular members 34, 35 are adjusted. The core 16 and the outer periphery of the corrugated steel pipe 17 are in close contact with each other. Also, tightening screws 36, 37 at various locations in the circumferential direction.
By individually selecting the amount of protrusion of the cable core 16 and the corrugated steel pipe 17, the center thereof can be aligned with the center line of the fixing fitting 30, that is, the center can be aligned.

A male thread 39 is formed on the outer periphery of the flange portion 24 of the main body fitting 19, and the external fitting 40 has this male thread 3.
A female thread 41 is formed on the inner periphery to be screwed into the hole 9 . The O-ring 42 is arranged in an annular groove on the outer periphery of the flange portion 24 to prevent water from entering between the outer periphery of the flange portion 24 and the inner periphery of the external fitting 40, and the rotation prevention screw 43 is inserted into the partition wall 22 of the external fitting 40. It is provided near the side end to prevent rotation of the external metal fitting 40 with respect to the main body metal fitting 19.

A recess 4 having an inner diameter larger than the outer diameter of the anticorrosive layer 8 is provided on the inner periphery of the end of the external metal fitting 40 that is far from the partition wall 22.
4 is provided and an annular elastic packing 45 is placed within this recess 44. The recess 44 has a cylindrical side surface formed with a female thread 46 and a receiving part 47 that receives the annular elastic packing 45 in the axial direction.
The receiving portion 47 is formed in a round shape. The fastening fitting 50 has a boss portion 52 formed on the outer periphery with a male thread 51 that is screwed into the female thread 46 of the external fitting 40 . It acts as a pressing portion 54 that presses the axial direction toward the axial direction. The tightening mode of the annular elastic packing 45 is the same as that of the annular elastic packing 27, and the annular elastic packing 45 prevents water from entering from the outside. The anti-rotation screw 55 is provided at the end of the external fitting 40 to prevent the fastening fitting 50 from rotating with respect to the external fitting 40. Further, a grounding screw 57 is provided on the flange portion 56 of the fastening fitting 50.

The end face of the flange portion 56 is provided with extension portions 62 extending a predetermined length in the axial direction at positions 180° apart from each other, and the extension portions are provided with through holes for positioning tightening screws 70a and 70b, which will be described later. 63
is formed. The clamps 65a, 65b as a pair of abutting members have concave portions 66a, 66b as mountain-shaped receiving portions for receiving the anti-corrosion layer 18, and screw penetration portions 67a, 67b provided at both ends of the concave portions 66a, 66b. and a screw penetration part 6
Screw through holes 68a, 68b are formed in the holes 7a, 67b, as shown in FIG. The clamps 65a, 65b are applied with the anti-corrosion layer 18 symmetrically to each other on both sides of the extension 62. The tightening screws 70a, 70b are sequentially passed through the through hole 68b of the clamp 65b, the through hole 63 of the extension part 62, and the through hole 68a of the clamp 65a, and the washers 71a, 71b are fitted into the nuts 72a,
72b is screwed together. Tightening screws 70a, 70
By adjusting the amount of screwing between b and the nuts 72a and 72b, it is possible to appropriately tighten the anticorrosion layer 18 to any anticorrosion layer 18 whose outer diameter is within a predetermined range. Further, the clamps 65a and 65b are attached to the clamping metal fittings 50 against the anticorrosive layer 18 having an arbitrary outer diameter.
The sealing of the annular elastic packing 45 is not hindered because the annular elastic packing 45 can be positioned at equal distances from the center of the annular packing 45. Note that FIGS. 4a and 4b show different cross-sectional shapes of the tightening fitting 50, and the tightening fitting 40 has a regular hexagonal shape, a regular octagonal shape, etc., and is defined in a shape that can be rotated by using a tool. ing.

Fig. 6 shows another embodiment of the clamp as a support member, Fig. 6a is a front view thereof, and Fig. 6b is a plan view thereof.

In the clamps 65a and 65b shown in FIG. 4, the concave surfaces 66a and 66b serving as chevron-shaped receiving portions are curved at the apex of the chevron, whereas in the clamp 74 shown in FIG. 6, the surface portion 75 serving as the chevron-shaped receiving portion forms an angle at the top of the chevron.

As for the screw penetration part 76 and the screw penetration hole 77 of the screw penetration part 76, the screw penetration part 67a, 67b of the clamp 60a, 60b and the screw penetration hole 68a,
Same as 68b.

In this way, according to the present invention, the pair of abutment members are symmetrically abutted against the anticorrosion layer and are tightened together by the tightening screws that pass through the metal fittings.
Regardless of the difference in the outer diameter of the anti-corrosive layer, the anti-corrosive layer can be tightened, and the center of the anti-corrosive layer can be made to coincide with the center of the metal fitting, and problems with sealing of the annular elastic packing can be avoided. In addition, the backing member is
Since it has a mountain-shaped receiving part and receives the anti-corrosion layer in this mountain-shaped receiving part, the anti-corrosion layer can hit a predetermined position of the receiving part according to its diameter,
A common backing member can be used for anticorrosion layers of various diameters, and costs can be reduced.

Although the embodiment shows a waterproof and explosion-proof terminal processing section that has two annular elastic packings, waterproof and explosion-proof, the present invention can also be applied to a waterproof terminal processing section that has only one annular elastic packing. Needless to say, it is.

[Brief explanation of drawings]

Figure 1 is a structural diagram of a conventional corrosion protection layer fixing part, Figure 2 is a diagram viewed from the direction of Figure 1, Figure 3 is a structural diagram of an embodiment of the present invention, and Figure 4 is a diagram viewed from the direction of Figure 3. 5 is a plan view of the clamp shown in FIG. 4, and FIG.
The figure shows another embodiment of the clamp. 15... Corrugated steel pipe armored cable, 16... Cable core, 17... Corrugated steel pipe, 18... Corrosion protection layer, 50
...Tightening fitting, 62...Extension part, 65a, 65b,
74...Clamp, 66a, 66b...Concave portion, 67
a, 67b, 76...screw penetration part, 70a, 70b
...Tightening screw, 75...face part.

Claims (1)

[Scope of utility model registration request] In the terminal treatment section of a corrugated steel pipe armored cable in which a corrugated steel pipe and a corrosion protection layer are sequentially provided on the outer periphery of the cable core, a pair of abutting members are provided with a mountain-shaped receiver that receives the corrosion protection layer of the corrugated steel pipe armored cable. and screw penetration parts provided at both ends of this chevron-shaped receiving part, and the pair of abutting members are symmetrically applied to the anticorrosion layer, and an annular elastic member disposed between the external metal fitting and the anticorrosion layer. A corrugated type characterized in that a tightening screw passing through a tightening fitting that acts to press the packing in the axial direction tightens mutually opposing screw penetration parts of a pair of abutment members. Terminal processing section of steel pipe armored cable.