JPH11169807A - Device and method for cleaning pipe interior - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve removing capacity and removing efficiency of depositions on the pipe interior. SOLUTION: This device for cleaning the pipe interior 1 is provided with a support body 2 supported by a first hollow support axis, cutting bodies 3 and 3 freely rotatably supported at eccentric positions of the end face of the support body 2 and having outer blades 3a, 3a and so forth on the surfaces opposite to the inner surface of the pipe to be cleaned and having bottom blades 3b, 3b and so forth on the end face, and an impeller 4 connected and fixed to the end face of the support body 2. From fluid injection holes provided on the peripheral wall of the first hollow support axis, fluid is injected to hit it against blades 4B, 4B and so forth of the impeller 4 and convert impact force of the fluid into rotational force by the impeller 4 and rotate the support body 2. In this way, the cutting bodies 3 and 3 are rotated around the rotating axis of the support body 2, and also by centrifugal force, they are abutted on the pipe inner surface to scrape off the depositions on the pipe interior by the bottom blades 3b, 3b and so forth and the outer blades 3a, 3a and so forth forth cutting bodies 3 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe cleaning apparatus and a pipe cleaning method.

[0002]

2. Description of the Related Art Conventionally, pipes have been widely used for conveying fluids including powders and granules. It is a well-known fact that when such a fluid is transported using a pipe, the transported material may adhere to the inner surface of the pipe. If the deposits on the inner surface of the tube are not removed, the tube may be closed. Therefore, removal of the deposit on the inner surface of the pipe has been conventionally performed.

For example, in civil engineering work, there is a case where a solidified material such as cement or water glass is transported using a pipe.
Especially in the chemical liquid injection method that has been actively performed in recent years,
A number of conveying tubes are used for conveying the solidified material. Since the solidified material may adhere to the inner surface of the tube of the solidified material and solidify in some cases, conventionally, pressurized water is circulated in the tube to wash away the extraneous matter in the tube.

[0004]

However, the conventional in-pipe cleaning apparatus and the in-pipe cleaning apparatus method have problems in that it is not possible to remove firmly adhered substances in the pipe, and it takes a long time to remove the substance. For example, when the solidified material adheres and solidifies on the inner surface of the tube of the solidified material described above, the solidified material cannot be washed away with pressurized water or the like. Further, in the case of rinsing with pressurized water, it is necessary to wait until the deposits in the pipe are completely removed, and it takes a long time for the removal operation.

[0005] Therefore, a main object of the present invention is to improve the removal ability and removal efficiency of extraneous matter in a tube.

[0006]

According to the present invention, there is provided an in-pipe cleaning apparatus which solves the above-mentioned problems, and has a support inserted into the pipe and driven to rotate, and supported by the support so as to freely contact and separate from the inner surface of the pipe. The cutting body has a blade on at least one of a surface facing the inner surface of the pipe and a tip surface. In the in-pipe cleaning device, it is preferable that an impeller portion is provided on the support, and a fluid supply unit that supplies fluid to the impeller portion and rotationally drives the support is provided.

On the other hand, in the in-pipe cleaning method of the present invention using these in-pipe cleaning devices, the in-pipe cleaning device is inserted into the pipe, the support is rotated, and the cut body is rotated around the rotation axis of the support. The rotating cutting body is brought into contact with the inner surface of the pipe by centrifugal force, and the blades of the rotating cutting body scrape off the deposits in the pipe.

<Operation> In the present invention, since the cutting body is supported by the support so as to be able to freely contact and separate from the inner surface of the pipe, the cutting body is rotated by rotating the support. The tube is rotated around the rotation axis and is brought into contact with the inner surface of the tube by centrifugal force. Therefore, by inserting the device of the present invention into the pipe and rotating the support thereof, if there is an adhering substance on the inner surface of the pipe, this is removed by the blade of the cutting body which rotates while being in contact with the inner surface of the pipe. Can be scraped.

[0009]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2
FIG. 3 shows an external view of an in-pipe cleaning device example 1 according to the present invention, and FIG.
Indicates a longitudinal section along the axis. The in-pipe cleaning device 1 includes a support 2 that is inserted into a pipe to be cleaned and is driven to rotate, and cutting bodies 3 and 3 that are supported by the support 2 and that can freely contact and separate from the inner surface of the pipe. The cutting bodies 3, 3
The blades 3a, 3a,..., 3b, 3b.

More specifically, in the in-pipe cleaning device 1 of the present embodiment, the support 2 has a hollow cylindrical shape, a pair of cutting bodies 3 and 3 are supported on the front end surface, and the impeller 4 is mounted on the rear end surface. Are connected and fixed.

As shown in FIG. 4, each of the cutting bodies 3 and 3 is a columnar body having a substantially fan-shaped cross section, and has a plurality of circumferentially extending surfaces (surfaces facing the inner surface of the pipe) extending in the thickness direction. Outer blades 3a, 3a
Are formed on the front end plane, and a plurality of bottom blades 3b, 3b extending radially from the center axis so as to form the same blade surface as the outer blades 3a, 3a. In the illustrated example of the cutting body 3, the central angle is set to about 170 °, and the radius (from the center of the circle to the outer blades 3 a, 3 a,..., Tip) is the same as the radius of the support 2. Further, each of the cutting bodies 3, 3 has one bolt insertion hole 3b, 3b penetrating in the thickness direction, in the vicinity of one corner on the circumferential surface side. In such cutting bodies 3, the center axis of the cutting body 3 and the center axis of the support 2
Are arranged symmetrically with respect to the center axis of the support member 2 and through the bolt insertion holes 3b, 3b.
Are supported by the support 2 by bolts 10, 10 screwed into the screw holes 2a, 2a. Therefore, although the pair of cutting bodies 3, 3 are supported by the support 2,
It is rotatable around each bolt 10 that is eccentric with respect to the center axis of the support 2.

As shown also in FIG. 5, the impeller 4 has a hollow cylindrical portion 4A and a rear end surface (a surface opposite to a connecting surface with respect to the support 2) of the hollow cylindrical portion 4A, which is rotatable with respect to the rotation direction. And a plurality of blades 4B, 4B,... Therefore, the impeller 4 of the present example is a so-called rearward inclined blade (wing) type, similar to a turbofan. However, in this example, the blades 4B, 4B,... Are formed of flat plates, and each of the blades 4B is at least a fluid jet to be described later in a tangential direction from the circular edge of the opening of the rear end surface of the hollow cylindrical portion 4A to the circular edge. Each of the holes 5b, 5b,... Extends to the outer peripheral edge in the tangential direction of the circular edge with one end at a position separated by the radius or more. The impeller 4 is coaxially connected and fixed to the rear end face of the support 2 by a bolt (not shown).

On the other hand, a first hollow support shaft 5 that penetrates through the impeller 4 with play is inserted into the support 2, and the support 2 is coaxially and rotatably supported by the first hollow support shaft 5. Have been. Reference numerals 11, 11,... Denote bearing balls, and 12 denotes bolts for fixing the support and the first hollow support shaft only in the longitudinal direction and closing the tip of the first hollow support shaft. On the peripheral wall of the first hollow support shaft 5, four fluid injection holes 5b, 5b,... Are formed at portions corresponding to the blades 4B, 4B,. The fluid injection holes 5b are through holes and communicate with the inside and outside of the first hollow support shaft 5.

A second hollow support shaft 6 having substantially the same outer diameter as the first hollow support shaft 5 is connected to the rear end of the first hollow support shaft 5, and the internal passages 5A and 6A of the two support shafts 5 and 6 communicate with each other. I have. Second
On the outer surface of the hollow support shaft 6, four guides 6B are provided. A hose connecting portion 6C is formed on the outer peripheral surface on the rear end side of the second hollow support shaft 6.
The tip of the hose 7 is connected to C. The proximal end of the hose 7 is connected to a discharge port of a fluid pressure pump (not shown).

Therefore, in the present apparatus 1, the fluid from the fluid pressure pump pumps the fluid in the hose 7, the second hollow support shaft passage 6A, the first hollow support shaft passage 5A and the first hollow support shaft 5. The nozzles 4B, 4B,... Of the impeller 4 are jetted and supplied through the holes 5b, 5b,. Also, the guides 6B, 6B,... Serve to hold the support 2 and the impeller 4 so as not to contact the inner wall of the pipe P when inserting the present apparatus 1 into the pipe to be cleaned. This guide 6
B, 6B... Are preferably projected to such an extent that the device 1 is always held in the center of the pipe.

When cleaning the inside of the pipe by using the inside-of-pipe cleaning apparatus 1, the inside of the inside of the pipe cleaning apparatus 1 is preferably connected to the guide 6B,
6B... Are inserted into the pipe P (shown only in FIG. 6). Thereafter, the fluid pump is operated to supply the fluid into the first hollow support shaft 5 via the hose 7 and the second hollow support shaft 6, and as shown in FIG. The fluid is ejected in the radial direction (in the direction of the solid arrow in the drawing) with respect to the first hollow support shaft 5 through the fluid ejection holes 5a, 5a,.
To the wings. As a result, the fluid blades 4B, 4B
The impeller 4 rotates in the direction of the arrow indicated by the two-dot chain line in FIG. The blades 4B, 4B,... Are always inclined with respect to the fluid jetting direction, and the component force in the rotation direction of the impeller 4 does not substantially disappear, so that the impeller 4 rotates stably.

Since the impeller 4 is coaxially connected and fixed to the support 2, the support 2 also rotates as the impeller 4 rotates. At this time, the pair of cutting bodies 3, 3 are rotatably supported by the bolts 10, 10 at eccentric positions with respect to the support 2, respectively. As shown in FIG. 6, it is rotated around each of the bolts 10 and 10 by centrifugal force to protrude laterally beyond the support 2, as shown in FIG. One of the blades 3a is brought into contact with the inner surface of the pipe P. In the illustrated example, the outer cutting edge 3 of each of the cutting bodies 3, 3 is shown.
are closer to the inner surface of the pipe P in order from the side closer to the bolt 10, and the third outer cutting blade 3a is in contact with the inner surface of the pipe P.

Therefore, if there is any deposit on the inner surface of the pipe P, the deposit is first cut by the bottom blades 3b, 3b,... Of the tip surface of the cleaning device 1 to be inserted. The deposits remaining without being removed by the blades 3b are cut by the outer blades 3a rotating in the circumferential direction of the pipe P while being in contact with the inner surface of the pipe P. Since the outer blades 3a of each of the cutting bodies 3, 3 come closer to the inner surface of the pipe P in order from the side closer to the bolt 10 up to the outer blade 3a which comes into contact with the inner surface of the pipe P, residual deposits are removed from the outer cutting blade. 3a, 3a
... is gradually cut.

As described above, the present apparatus 1 is designed to cut off the deposits in the pipe by the bottom blades 3a, 3a... And the outer blades 3b, 3b. Kimono can be reliably removed. Further, since the attached matter in the pipe can be reliably removed only by inserting the present apparatus 1 through the pipe to be cleaned once, the required time is greatly reduced.

<Others> (1) The fluid in the above example is preferably a cleaning liquid such as water. In this case, the fluid ejection holes 5
The cut matter inside the pipe is reliably washed out of the pipe by the water jetted from b and 5b and used for the rotation of the support 2.

(2) The present invention is not limited by the shape and number of the cutting body 3, the blades 3a and 3b, the support 2 and the impeller 4 in the above example. For example, the blade may be formed only on one of the tip surface and the outer peripheral surface of the cutting body. Further, the cutting body may be supported not at the tip end surface of the support but at the middle of the support in the longitudinal direction. Further, one or three or more cutting bodies may be provided, and a plurality of cutting bodies may be provided in the longitudinal direction of the support.

On the other hand, as the impeller, a known impeller such as a propeller shape or a screw shape can be used. in this case,
The jet supply direction of the fluid is appropriately determined according to the blade shape.
Further, the blades may be erected directly on the support.

(3) In the above example, the fluid is sprayed and supplied to the impeller 4 connected and fixed to the support 2 to rotate the support 2, but the impeller 4 is not provided but the support is provided. The body may be rotated via a rotary shaft by a known rotary drive unit such as a motor or an engine.

(4) In the present invention, when the support is not rotating, it is preferable to urge the cutting body so as not to contact the inner surface of the pipe. Further, in the above example, the cutting body is brought into contact with the inner surface of the pipe by the rotation of the support, but the amount of rotation of the cutting body with respect to the support is restricted to a point where the cutting body just comes into contact with the inner surface of the pipe. Preferably, means are provided.

(5) The target pipe may be non-flexible or flexible, but is particularly suitable for a metal pipe such as a steel pipe.

[0026]

As described above, according to the present invention, the in-pipe deposits can be removed by the cutting body, so that the ability to remove the in-pipe deposits and the removal efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an in-pipe cleaning device according to the present invention.

FIG. 2 is a perspective view of the in-pipe cleaning device according to the present invention, as viewed from another direction.

FIG. 3 is a longitudinal sectional view along a rotation axis of the in-pipe cleaning device according to the present invention.

FIG. 4 is a left side view of the in-pipe cleaning device according to the present invention.

FIG. 5 is a vertical sectional view of an impeller unit.

FIG. 6 is a left side view of the in-pipe cleaning device according to the present invention during rotational driving.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cleaning device in pipe, 2 ... Support body, 3 ... Cutting body, 4 ... Impeller, 5 ... 1st support shaft, 6 ... 2nd support shaft, 7 ... Hose.

Claims (3)

[Claims] 1. A support inserted into a pipe and driven to rotate,
A cutting body that is supported by the support and that can be freely moved toward and away from the inner surface of the tube, and the cutting body has a blade on at least one of a surface facing the inner surface of the tube and a tip surface. And an in-pipe cleaning device. 2. An impeller unit is provided on the support, and
2. The in-pipe cleaning device according to claim 1, further comprising a fluid supply unit that supplies a fluid to the impeller unit and rotationally drives the support. 3. The in-pipe cleaning device according to claim 1 or 2 is inserted into the pipe, the support is rotated, the cutting body is rotated around a rotation axis of the support, and centrifugal force is applied. A method for cleaning the inside of a pipe, wherein the blades of the rotating cutting body are brought into contact with the inner surface of the pipe to scrape off the deposits in the pipe.