JPH0640582U - Sealing device for cable insertion device into pipe - Google Patents

Abstract

(57) [Summary] [Purpose] To enable simple and reliable sealing around the cable at the boundary between the inside and outside of the case in the pipe endoscopy method. [Construction] A sealing device in a device for inserting a cable 8 having a large-diameter block-shaped body in the middle and having a circular cross section from the outside into a pipe filled with a fluid sandwiches the cable 8. It has a housing 21 divided in two in the circumferential direction, and a ring-shaped seal member 31 divided in two in the circumferential direction, which is arranged between the inner peripheral surface of the housing 21 and the outer peripheral surface of the cable 8. The plurality of sealing materials 31 are connected to the cable 8.
By arranging them at a distance in the length direction, the sealed state is secured even when the flexible cable 8 swings.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sealing device in a device for inserting a cable into a pipe, and in particular, a cable in a pipe endoscope construction method equipped with a TV camera is provided with a large-diameter block-shaped body in the middle and has a circular cross section. The present invention relates to a sealing device in a cable insertion device for inserting a cable into a pipe filled with a fluid from outside the pipe.

[0002]

[Prior art]

 Conventionally, as a method of inspecting the state while flowing a fluid such as water in the pipe, insert a cable with a large-diameter block-shaped body such as a TV camera or microphone at the tip from the fire hydrant into the pipe, An in-pipe endoscopy method of inspecting the inside of the pipe with this TV camera is known.

The cable insertion device in the in-pipe endoscopy method is generally one in which a cable is inserted from the outside of the case communicating with the inside of the pipe into the case and the cable is fed into the pipe by an appropriate feeding device. .

[0004]

[Problems to be solved by the device]

 However, as mentioned above, the cable has a large-diameter block-shaped part, and this block-shaped part must be inserted from the outside of the case into the case in addition to the normal cable part. There is a problem that it is difficult to achieve a perfect seal because the seal structure must be taken into consideration.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to make it possible to easily and surely seal around a cable at the boundary between the inside and outside of a case in a pipe endoscopic method.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an apparatus for externally inserting a cable having a large-diameter block-shaped body in the middle and having a circular cross section into a fluid-filled tube. The sealing device has a circumferentially halved housing for sandwiching the cable, and a circumferentially bisected ring-shaped sealing material arranged between the inner peripheral surface of the housing and the outer peripheral surface of the cable. The seals are arranged so that they are spaced apart in the length direction of the cable.

[0007]

[Action]

 With such a configuration, the housing and the sealing material are both formed in two in the circumferential direction, so that when inserting the large-diameter block-shaped body at the tip of the cable into the case, the cable insertion device is used. Before attaching to a fire hydrant, etc., disassemble the housing and sealing material and let the block pass through. After passing the block state, reassemble the seal material and housing to connect the inside of the case with the inside of the pipe. After that, the sealing material will reliably seal only the cable portion having a circular cross section. In addition, since a plurality of sealing materials are arranged at a distance in the length direction of the cable, the sealed state is secured even when the cable swings around the axis.

[0008]

【Example】

 First, the in-pipe endoscopy method will be described with reference to FIG. Here, 1 is a conduit for tap water, etc. buried in the ground, above which pits 2 for underground fire hydrants are provided at appropriate intervals. A branch pipe 3 is introduced from the pipe line 1 into the pit 2, and a fire hydrant (not shown) is attached to the upper end of the branch pipe 3 via a sub valve 4. When performing the in-pipe endoscopy method, the auxiliary valve 4 is closed, the fire hydrant is removed, and the cable insertion device 5 is connected to the auxiliary valve 4 as shown in the figure.

The cable insertion device 5 has an upper and lower guide outer cylinder 6 as a case connected to the auxiliary valve 4 instead of the fire hydrant, and the seal device 7 of the present invention is provided at the upper end of the guide outer cylinder 6. Is installed. The sealing device 7 is connected to a cable feeding device 9 capable of feeding the cable 8 in the atmosphere. Reference numeral 10 denotes a guide inner cylinder, which is inserted from the guide outer cylinder 6 into the conduit 1 through the auxiliary valve 4 and the branch pipe 3.

The cable 8 is provided with a plurality of large-diameter block-shaped bodies 11 such as a TV camera, its illumination, and a control device at appropriate intervals from its tip. Then, the cable 8 passes from the cable drum 12 around which the cable 8 is wound, through the cable sending device 9, the sealing device 7, the guide outer cylinder 6, the sub valve 4, the branch pipe 3, and the guide inner cylinder 10. , Is guided into the pipeline 1. A display device 13 for displaying an image from a TV camera is connected to the cable drum 12.

A guide member 14 is provided at the lower end of the inner guide tube 10, and the guide member 14 is configured to guide the inserted cable 8 to bend at a right angle and send it out into the conduit 1. ing.

1 to 5 show a detailed structure of the sealing device 7. Reference numeral 21 denotes a housing, which has a vertical through hole 22 for passing the cable 8 having a circular cross-section in the center and has a circumferentially bisected configuration corresponding to the through hole 22. It has halves 23, 24. These halves 23, 24 can be integrally assembled and disassembled by a bolt 25, and a sealing material 26 is sandwiched between the halves 23, 24 excluding the through hole 22. Further, the housing 21 is attached to the upper end of the guide outer cylinder 6 by the bolt 27 in the assembled state. Reference numeral 28 denotes a sealing material, which is provided between the housing 21 and the guide outer cylinder 6 so as to correspond to the periphery of the through hole 22 and a hole 29 formed at the upper end of the guide outer cylinder 6 corresponding to the through hole 22. It is provided in.

On the inner peripheral surface of the through hole 22 of the housing 21, annular seal material grooves 30 are formed at three locations spaced in the length direction. A ring-shaped sealing material 31 is fitted in at least two sealing material grooves 30. Each seal member 31 is formed in a circular cross section as shown in the figure, and is divided into two in the circumferential direction. A hemispherical convex portion 33 is formed at one end of the circumferentially divided portion 32, and a concave portion 34 into which the convex portion 33 is fitted is formed at the other end. An annular groove 35 is formed between the sealing material grooves 30, and each annular groove 35 is communicated with the atmosphere by a discharge port 36 penetrating the half body 24.

With such a configuration, when performing an endoscopic inspection of the conduit 1, the cable 8 is unwound from the cable drum 12, and the tip end of the cable 8 is passed through the unwinding feeding device 9 At the same time, the guide outer cylinder 6 to which the seal device 7 is not attached is inserted into the guide outer cylinder 6 from the upper end. When all of the large-diameter block-shaped body 11 is inserted into the guide outer cylinder 6, the feeding device 9 is set in the feed operable state and the sealing device 7 is attached as shown in the figure.

When mounting the sealing device 7, the protrusions 33 and the recesses 34 of each ring-shaped sealing material 31 are fitted to each other to mount the sealing material 31 on the outer circumference of the cable 8 and to penetrate the cable 8. The housing 21 is assembled by being housed in the hole 22 and by joining the halves 23 and 24 so that the sealing material 31 fits into the sealing material groove 30. At the time of this assembly, the sealing material 26 is sandwiched between the halves 23 and 24. Finally, the assembled housing 21 is attached to the upper end of the guide outer cylinder 6 via the seal material 28.

In this assembled state, a seal member 28 seals between the periphery of the hole 29 of the guide outer cylinder 6 into which the fluid such as water in the pipeline 1 enters and the periphery of the through hole 22 of the housing 21. To be done. In addition, the space between the halves 23 and 24 around the through hole 22 of the housing 21 is sealed by the sealing material 26. Further, the space between the housing 21 and the cable 8 in the through hole 22 is sealed by the sealing material 31.

When the feeding device 9 is operated to insert the cable 8 into the conduit 1, the cable 8 moves in the lengthwise direction inside the through hole 22 in the portion of the housing 21. At this time, the sealing state between the cable 8 and the inner peripheral surface of the through hole 22 is maintained by the sealing material 31. The cable 8 has flexibility, and when it is fed into the conduit 1, it may oscillate around the axis in the housing 21, but the sealing material 31 should be separated in the lengthwise direction of the through hole 22. Since multiple units are installed, the sealed state can be reliably maintained even if such swinging occurs. When a leak occurs in the portion of the seal material 31 on the side close to the guide outer cylinder 6, the leaked fluid in the pipe is discharged to the outside of the housing 21 through the annular groove 35 and the discharge port 36.

[0018]

[Effect of device]

 As described above, according to the present invention, since the housing and the sealing material are both formed in two in the circumferential direction, when inserting the large-diameter block-shaped body at the end of the cable into the case, By disassembling the housing and sealing material, it is possible to pass the block-shaped body, and if the block state is passed, assemble the sealing material and housing to ensure a cable with a circular cross section. Since it is possible to seal the cable and multiple sealing materials are arranged at a distance in the length direction of the cable, the sealing state can be secured even if the cable swings around the axis. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a sealing device in a device for inserting a cable into a pipe according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the sealing device as viewed from the front.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged view of a sealing material in FIG.

5 is a cross-sectional view taken along line VV in FIG.

FIG. 6 is an overall view of a device for inserting a cable into a tube according to an embodiment of the present invention.

[Explanation of symbols]

 8 Cable 21 Housing 31 Sealant

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Maki 2-26 Ohama-cho, Amagasaki City, Hyogo Stock Company Kubota Mukogawa Works (72) Toshio Tojima 2-26 Ohama-cho, Amagasaki City Hyogo Stock Company Kubota Mukogawa Factory (72) Inventor Tsutomu Itamoto 2-26 Ohamacho Amagasaki City Hyogo Stock Company Kubota Mukogawa Factory

Claims (1)

[Scope of utility model registration request] 1. A sealing device in a device for inserting a cable having a large-diameter block-shaped body in the middle and having a circular cross-section into a pipe filled with a fluid from outside the pipe. Has a housing that is divided in two in the circumferential direction and that sandwiches a ring-shaped seal material that is divided between the inner peripheral surface of this housing and the outer circumferential surface of the cable. A sealing device in a cable insertion device into a pipe, which is arranged at a distance in a direction.