JP2846214B2 - Pipe wall cleaning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inner wall cleaning apparatus which is used for cleaning various pipes such as power plants and water outlet pipes of various plants and power plants.

[0002]

2. Description of the Related Art Among pipe inner wall cleaning devices that are inserted into various plants, power plant intake / drainage pipes, etc. to clean foreign matters such as rust, sand, and adhesion products on the pipe inner wall, the pipe is swept away by a water flow or a gas flow in the pipe. As one of the devices for cleaning the inner wall of the pipe, there is a disk-shaped pig as shown in the side view of FIG. The outer diameter of the disc 32 is about 2 to 4% larger than the inner diameter of the inner wall 1 'of the pipe, and the disc 32 is put into the pipe 1 while being discarded by the water or gas flow 34. At the outer peripheral end of the pipe 32, the inner wall 1 'of the pipe is cleaned. However, in such a device, the outer diameter of the disk 32 is larger than the inner diameter of the pipe by several percent, and the elasticity and deformation of the disk 32
Since the outer peripheral portion of the disc is pressed against the inner wall 1 'of the pipe and is washed away by the water flow or the gas flow 34, there is a disadvantage that the device is easily clogged at a bent portion of the pipe 1. Once the tube 1
If the device is clogged in the inside, it is necessary to find out the clogged portion and to take out the device by cutting the tube 1 at that portion, etc. When the tube 1 is buried in the seabed or underground, these operations are required Requires great effort and great effort.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of such circumstances, and when a device is clogged in a pipe, the outside diameter of the device is automatically reduced after a predetermined time has passed. An object of the present invention is to provide a pipe inner wall cleaning device that can eliminate clogging by shrinking the pipe to a smaller size and eliminate the work of removing the apparatus by cutting the pipe.

[0004]

SUMMARY OF THE INVENTION The present invention provides an apparatus for cleaning a pipe inner wall while a disk mounted on the outer periphery of a pig body is inserted into a pipe to be cleaned and is swept away by a fluid. A divided disk which is divided into a fan shape so as to be movable in the radial direction, and which is attached to the divided disk and always urges the disk radially inward so that the outer diameter of the disk is smaller than the inner wall of the tube. A resilient member, an expansion member installed on the inner diameter side of the divided disk to move the disk radially outward by introducing a compressed fluid, and a discharge time of the compressed fluid introduced to the expansion member. And a timer for setting in advance.

Further, according to the present invention, there is provided the above-mentioned apparatus, wherein a plurality of divided discs each of which is divided in an appropriate number in the circumferential direction and is fan-shaped so as to be movable in the radial direction are mounted in parallel on the outer periphery thereof. And a flexible joint for connecting the pig bodies to each other.

[0006]

In the pipe inner wall cleaning apparatus of the present invention, the divided disk moves toward the radially outer side by expanding the expansion member while being supported by the pig body until it reaches the movement-restricted position.
In this state, the outer diameter of the divided disk is several percent larger than the inner diameter of the pipe, as in the conventional apparatus, and the inner wall of the pipe can be cleaned in the same manner as in the conventional apparatus. In the above state, a timer time is set before the device is put in the tube, and after the timer is operated, the device is put in the tube and the cleaning operation is started. The set time of the timer is set to be a value obtained by adding a margin to the time required for the device to be flushed without clogging the pipe and to reach the receiver. The time to reach the receiver can be calculated from the length of the tube and the flow velocity of the fluid flowing through the device.

If the device is clogged in the middle of the pipe, the timer set time elapses at that point, the compressed fluid of the expansion member is automatically discharged, and the clogging of the device is eliminated by the contraction of the dividing disk, and the device is flushed again. Go. In addition, by providing a flexible joint in the center of the device, the front and rear split disks of the device are bent along the bend of the tube inner wall at the bend of the tube, so that the conventional bend easily clogged with the bend. The device is less likely to be clogged.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pipe inner wall cleaning apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a side view of the apparatus, in which the right half shows an outer shape and the left half shows a vertical section. FIG. 2 is II-II of FIG.
FIG. FIG. 3 is a detailed sectional view of the same spring, and FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. FIG. 5 is a detailed sectional view of the roller in FIG. 2, and FIG.
It is an arrow view. FIG. 7 is a detailed sectional view of a mouth portion of the air tube in FIG. 1, and FIG. 8 is a circuit diagram of a compressed air tube.

In FIGS. 1 and 2, two cylindrical pig bodies 2 each having a diameter considerably smaller than that of a pipe 1 for cleaning an inner wall 1 'of the pipe are covered with a cover 3 at one end. The ends are connected to each other by a flexible joint 5 and a bolt nut 6 via a distance piece 4 to form one body. Two disc receivers 7 are attached to the outer periphery of each pig body 2, respectively, and a flange-shaped divided disc 8 is fitted therein so as to be movable in the radial direction. This divided disk 8
Is made of an elastic material such as neoprene rubber, is divided into four equal parts in the circumferential direction, and each part is formed in the shape of two fans. A spring 9 is attached to the sector-shaped concave portion of the divided disk 8 so as to always urge the disk 8 inward in the radial direction so that the outer diameter of the disk becomes smaller than the inner wall 1 ′ of the pipe. As shown in FIGS. 3 and 4, a pin 10 penetrating the divided disk 8 is projected from an elongated hole 11 of the disk receiver 7, and a spring 9 is connected to both ends of the pin 10 and the outer periphery of the pig body 2. I have. The number of divisions of the divided disk 8 is divided into four equal parts.
It may be equally divided, 6 equally divided, 8 equally divided, or the like.

An air tube or an inflatable seal (hereinafter referred to as an air tube) 12 is interposed between the inner diameter side of the divided disk 8 and the outer periphery of the pig body 2, and compressed air is supplied to the air tube 12. When inserted, the air tube 12 expands to overcome the tensile force of the spring 9 and move the divided disk 8 outward in the radial direction, and the divided disk 8 is moved until the pin 10 hits the top of the elongated hole 11 of the disk receiver 7. In this state, the outer diameter of the divided disk 8 is several percent larger than the inner diameter of the inner wall 1 'of the pipe. In order to guide the movement of the divided disk 8,
A roller 13 is provided on a divided portion of the divided disk 8. As shown in FIGS. 5 and 6, the roller 13 is mounted on the disk receiver 7 with a pin 14, and It guides the dividing edge.

Next, the details of the mouth portion for sending compressed air to the air tube 12 will be described with reference to FIG. 7. The compressed air tube 15 is inserted into the cover plate 16 by a union joint.
And the ground 1 inside the cover plate 16.
7, the base of the air tube 12 is inserted into the packing 18.
The packing 18 is held down by the cover plate 16.

Referring to FIG. 8, the circuit of the compressed air pipe 15 will be described.
Is sent from the reservoir of the air compressor (not shown) to the air tube 12 and the accumulator 22 through the check valve 21 by an air supply hose, and when the inside of the air tube 12 and the inside of the accumulator 22 reach a predetermined pressure,
The air supply hose is disconnected. Subsequently, after the stop valve 19 is opened, the apparatus is put into the pipe 1 to start a cleaning operation. Stop valve 19
Is opened, the compressed air in the accumulator 22 gradually flows into the small-capacity air chamber 24 through the flow control valve 23 which has been previously narrowed down, and gradually increases the pressure in the small-capacity air chamber 24. Pressure is pilot pressure type directional control valve 2
When the operating pressure reaches 5, the switching valve 25 is switched to the exhaust port, and the compressed air in the air tube 12 is exhausted. The stop valve 19 is closed, the compressed air in the small-capacity air chamber 24 is exhausted from the stop valve 26, and the valve is closed to complete the reset. Therefore, the accumulator 22, the flow control valve 23 and the small capacity air chamber 2
4 constitutes a timer, and the operating time of the direction switching valve 25 can be arbitrarily set by adjusting the throttle of the flow control valve 23.

In such an apparatus, the divided disk 8 moves radially outward by inflating the air tube 12 while being supported by the disk receiver 7, so that the elongated hole 1 of the disk receiver 7 is formed.
1 until it reaches the top restricted position. In this state, the outer diameter of the divided disk 8 is several% larger than the inner diameter of the inner wall 1 'of the pipe, and the inner wall 1' of the pipe can be cleaned. In this state, a timer time is set before the apparatus is put into the pipe 1, and after the timer is operated, the present apparatus is inserted into the pipe 1 to start a cleaning operation of the pipe inner wall 1 '. The timer setting time is as follows:
It is assumed that a little extra time is added to the time of being swept away by the fluid flow 27 without clogging and going to the receiver. The time to reach the receiver can be calculated from the length of the tube 1 and the flow velocity of the fluid flow 27 flowing through the device.

When the apparatus is clogged in the middle of the pipe 1, when the timer time elapses, the direction switching valve 25 is operated to exhaust the compressed air in the air tube 12, and the divided disk 8 shrinks to cause the pipe inner wall 1 '. A gap is created between the disk and the divided disk 8, the clogging is eliminated, and the device is pushed away again. Further, in this device, since the two pin bodies 2 are connected by the flexible joint 5, if the pipe 1 has a bent portion, the divided disks 8 at the front and rear of the device follow the bend of the pipe inner wall 1 '. Because it is bent, it is hard to jam at the bend. In this embodiment, compressed air is sent to the air tube 12,
Hydraulic operation such as fresh water or seawater may be used. Further, the timer for contracting the air tube 12 may be constituted by an electric timer and a mechanical type such as a solenoid valve or a clockwork mechanism.

Thus, according to this device, when the device is clogged in the pipe 1, the outer diameter of the divided disk 8 is automatically reduced so as to be smaller than the inner wall 1 'of the pipe after a predetermined time has elapsed. The clogging can be eliminated, and the work conventionally taken out of the pipe 1 by cutting the pipe 1 when clogging can be eliminated. In addition, by incorporating a timer including an accumulator 22, a flow control valve 23, and a small capacity air chamber 24 in the apparatus, the divided disk 8 can be automatically contracted. Further, by providing the flexible joint 5, the device can smoothly pass through the bent portion of the pipe 1.

[0016]

In summary, according to the present invention, in a device for cleaning a pipe inner wall while a disk attached to the outer periphery of a pig body is inserted into a pipe to be cleaned and is swept away by a fluid, the apparatus is divided into an appropriate number in the circumferential direction. A divided disk which is fan-shaped and can move in the radial direction, and which is attached to the divided disk and constantly urges the disk radially inward so that the outer diameter of the disk is smaller than the inner wall of the tube. A resilient member, an expansion member installed on the inner diameter side of the divided disk to move the disk radially outward by introduction of the compressed fluid, and a discharge time of the compressed fluid introduced to the expansion member is preset. And a plurality of pig bodies in which a plurality of divided discs which are divided in an appropriate number in the circumferential direction and are fan-shaped so as to be movable in the radial direction are attached in parallel to the outer periphery in the above apparatus. When,
By having a flexible joint that connects the pig bodies to each other, if the device is clogged in the pipe,
After a predetermined period of time, the outer diameter of the device is automatically reduced to be smaller than the inner wall of the tube, so that clogging can be eliminated, and the work of removing the device by cutting the tube can be eliminated. The invention is of great industrial benefit because it provides a cleaning device.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the pipe inner wall cleaning device of the present invention,
The right half shows the outer shape, and the left half shows a vertical section.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a detailed sectional view of the spring in the same.

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a detailed sectional view of a roller in FIG. 2;

6 is a view taken in the direction of arrows VI-VI in FIG. 5;

FIG. 7 is a detailed sectional view of a mouth portion of the air tube in FIG. 1;

FIG. 8 is a circuit diagram of a compressed air pipe.

FIG. 9 is a side view of a conventional pipe inner wall cleaning device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 1 'Pipe inner wall 2 Pig body 3 Cover 4 Distance piece 5 Flexible joint 6 Bolt and nut 7 Disc holder 8 Dividing disc 9 Spring 10 Pin 11 Slot 12 Air tube 13 Roller 14 Pin 15 Compressed air pipe 16 Cover plate 17 Gland 18 Packing 19 Stop valve 20 Compressed air 21 Check valve 22 Accumulator 23 Flow control valve 24 Small capacity air chamber 25 Directional valve 26 Stop valve 27 Fluid flow

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihiko Sonoyama 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Inside Tokyo Electric Power Company (72) Inventor Satoru Takeda 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (56) References JP-A-4-338277 (JP, A) JP-A-6-39358 (JP, A) JP-A-3-25364 (JP, A) 74670 (JP, U) Actually open sho 59-31485 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B08B 9/04 F16L 55/00

Claims (2)

(57) [Claims] 1. An apparatus for cleaning a pipe inner wall while a disk attached to the outer periphery of a pig body is inserted into a pipe to be cleaned and is swept away by a fluid, and is divided into an appropriate number in the circumferential direction and fan-shaped in the radial direction. A dividing disk which can be moved; a resilient member attached to the dividing disk, which constantly urges the disk radially inward so that the outer diameter of the disk is smaller than the inner wall of the pipe; An expansion member installed on the inner diameter side of the disk to move the disk radially outward by introduction of the compressed fluid, and a timer for presetting a discharge time of the compressed fluid introduced to the expansion member. A pipe inner wall cleaning device characterized by the above-mentioned. 2. A plurality of pig bodies each having a plurality of divided discs which are divided in an appropriate number in the circumferential direction and are fan-shaped so as to be movable in the radial direction, and which are attached in parallel to the outer periphery, and the pig bodies are connected to each other. The pipe inner wall cleaning device according to claim 1, further comprising a flexible joint portion to be connected.