JPH02227178A - Brush for cleaning interior of pipe - Google Patents

Abstract

PURPOSE:To certainly clean the interior of a pipe by providing a plurality of parts having a shape optimum to remove various forein matters becoming the object of the cleaning in the pipe to the outer periphery of a cylindrical main shaft made of a soft resin. CONSTITUTION:A main shaft 1 made of a soft resin is formed into a cylindrical body and a large number of jet orifices are provided to said shaft in the radius direction thereof by drilling and a propelling blade part 2 is provided to the outer periphery of the leading end part of the main shaft 1 and a brush is rotated and propelled by the jet streams due to the blade of said blade part 2. Further, a solid removing part 3, an adhered substance removing part 4, a precipitate removing part 5, a solid removing part 6, a part 7 for a spiral groove and an extremely fine substance removing part 8 are mounted to the outer periphery of the main shaft 1 and clamped by clamping jigs 10, 11. Therefore, this brush can be appropriately altered and used corresponding to the kind of the foreign matter becoming the object to be removed in the pipe and a fixed substance or solid can be removed without damaging the pipe wall.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a brush for cleaning the inside of a pipe, which is used to remove foreign matter stuck or attached to the inside of a pipe. Concerning the appropriate removal of brushes.

(Prior art) Conventionally, foreign matter adhering to or depositing inside various pipes constituting heat exchangers, coolers, steam generators, etc. in various production plants has been removed to reduce the performance of these devices. In order to prevent this, the flexible cylindrical body has needle bristles, etc. integrated around its outer periphery to remove foreign matter, and pressurized air and water are used to propel and rotate the inside of the pipe to remove and clean foreign matter. A brush is known (for example, Japanese Utility Model Publication No. 58-40895).

(Problem to be solved by the invention) However, since seawater and fresh water, which are mainly used in heat exchangers including condensers and heaters, contain various miscellaneous substances, there are many types of foreign substances that accumulate in the tubes that make up the heat exchanger. Diverse. Foreign matter in this pipe is mainly caused by mussels, sea squirts, diatoms, algae, etc., which grow a large number of attached threads and grow in clusters on the pipe wall, waste oil, oily waste, sludge, etc., which settle and form sticky layers. Deposits that formed and adhered to the inner surface of the pipe, oysters that formed a lime mixture and grew and firmly adhered to the pipe wall,
It is classified as a solid substance that is formed from fixed substances such as barnacles, and generally crowded substances such as earth, sand, and sludge, and contains extremely hard substances such as quartz particles and iron scraps.

In contrast, the conventional brush described above has a highly flexible main body and is configured to remove foreign matter using needles on its outer periphery. Although attachments and deposits can be removed, there is a problem in that adhered substances that are firmly attached to the pipe wall cannot be removed.

Furthermore, when removing solid matter, extremely hard substances such as quartz particles may be caught between the brush and the tube wall, damaging the tube and causing leakage.

Further, in the conventional brush described above, the bristles and the like for removing foreign matter are integrally formed in the main body, so that it cannot be used appropriately depending on the type of foreign matter in the tube.

The present invention has been made in order to solve the problems of the above-mentioned conventional techniques, and can be used with appropriate modifications depending on the type of foreign matter to be removed, and can also be used to properly remove stuck and solid matter. The purpose is to provide a brush that can be removed.

(Means for achieving the object) In order to achieve the above object, the pipe cleaning brush of the present invention has the following features:
A plurality of parts each having a shape optimal for removing foreign matter to be cleaned are arranged in a layered manner around the outer periphery of a cylindrical main shaft made of soft resin.

(Function) Since a plurality of parts are set in a layered manner around the outer periphery of the main shaft, the type, number, arrangement, etc. of the parts can be freely selected and combined depending on the type of foreign object.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall structure of a brush according to the present invention.

Reference numeral 1 in the figure indicates the main shaft of the brush, and the main shaft 1 is made of, for example, soft resin and has a cylindrical shape as shown in FIG. 1a, a plurality of similar injection holes 1b are provided in the intermediate portion thereof, four of which are equally spaced in the circumferential direction and oriented slightly toward the distal end side from 90 degrees with respect to the axial direction. Furthermore, four engaging recesses 1c and ld are provided at equal intervals in the circumferential direction on the inner circumferential surface of both ends of the main shaft l. The main shaft 1 is integrated with various parts to be described later, and is propelled by pressurized air and water to move forward inside the pipe.

A propulsion blade part 2 (FIG. 3) is fitted onto the outer periphery of the tip of the main shaft l. The propulsion blade part 2 has blades 2a on the outer periphery, and an injection hole 2b is provided in the side wall at a position that coincides with the injection hole 1a of the main shaft 1 and extends in the same direction as the injection hole 1a. The propelling vane parts 2 provide rotation to the brush with blades 2a, and propel the brush with a jet stream from the injection holes 2b, thereby promoting the cleaning effect of the brush.

Further, on the outer periphery of the main shaft 1, various groups of parts optimally configured to optimally remove foreign matter in the pipe depending on the type thereof are fitted and stacked. That is, the parts group, in order from the tip side, is the adhered matter removal part 3, the deposited matter removal part 4,
It consists of a deposit removal part 5, a solid matter removal part 6, a spiral groove part 7, and a very fine matter removal part 8.

The stuck object removal part 3 (Fig. 4) consists of two parts, and the tip side part is, for example, a thick disk 3 made of soft resin.
It is constructed by attaching a thin disk 3b (FIG. 3B) made of hard resin or metal to the front end surface of a (FIG. A), and the rear end part is comprised only of the thick disk 3A. The outer diameter of this thick disk 3a is smaller than the outer diameter of the disks of each part described later. This configuration of the stuck object removing part 3 is based on the following experimental results (Tables 1 to 4).

Sessile substances are mainly formed by living organisms, and in seawater, they are
Although it differs depending on the cold current region, the main species are oysters and barnacles.These eggs turn into plankton, and when they migrate and attach to adherents, they become soft, gel-like adults.In this state, it is best to remove them from the roots. As shown in Table 1, it is relatively easy to remove the lime mixture from the roots, but within two weeks it forms a lime mixture from the roots, grows and firmly adheres to the adherend, and it becomes increasingly difficult to remove it from the roots. However, there was a relatively soft part of the lime mixture layer about 2 mm above the root, and the effects shown in Table 2 were obtained by destroying and removing this part. Table 3 shows the load used for this destructive removal converted into water pressure, and from these tables it can be seen that the water pressure required to effectively remove the lime mixture layer from the soft part is limited by the strength of the pipe. It can be seen that it remains within the usable range.

It was also confirmed that if a portion of such a lime mixture layer was removed, the remaining living organisms would gradually die without causing vortex corrosion.

Furthermore, scale-like high-temperature corroded pieces of stainless steel pipes generated by high-temperature fresh water or steam also form adhered substances, and it has been confirmed that these can also be removed by the above-mentioned method.

Table 1 Peeling effect of adhered substances (almost gel-like substances that have just adhered) α
(Inner diameter of pipe 22.91mm) (Notes> 1. The load is the number of tons applied to a round bar that is O, 1mm less than the inner diameter of the pipe.

2. For shellfish height g#Ita and below, the number was rounded down (L3, 5 sample tubes were used for each test).

4. In the table, the O mark indicates that the product has peeled off, and the X mark indicates that it has not peeled off.

5. Shellfish with a height of 4 m or more cannot be removed because they have started to take effect. Table 2. Table 3. Relationship table between load and water pressure (remarks). lnn decrease,
The lower half was added from the upper part to a pipe whose inner diameter was 20% smaller.

2. The aim was to destroy the shellfish at a height of about 2 meters from the base.

3. Five sample tubes each were tested.

4. In the table, ○ indicates destruction, and X indicates indestructible.

5. It takes about 6 months for the shellfish to reach a height of 7m or more, so if it is before then, water pressure of 5 to 6t/cnr is sufficient.)
7- can be used to good effect.

(Remarks) The inner diameters in Table 11 indicate standard values for Alblack tubes.

2. In the case of titanium tubes, the inner diameter will be larger.

If a brush is used in step 3 and ii, the load will be nearly double the value in the table above because it will cause an impact if it collides with the shellfish.

5. If operated at atmospheric pressure, the leakage will be large and the residual pressure will be extremely small, so it will not be effective.

Therefore, the adherent removal part 3 is configured as described above, and a part of the lime mixture layer of oysters, barnacles, etc. is removed using the hard resin or metal thin disk 3b to kill the remaining living organisms, and the remaining living organisms are killed. It is possible to effectively remove adhered substances such as scale-like high-temperature corroded pieces of pipes.

The deposit removing parts 4 (two pieces in the embodiment) are formed by cutting a fold of a thick circular plate 4a made of soft resin into a triangular half-cut along the entire circumferential direction (FIG. 5).

The deposits are mainly mussels, sea squirts, diatoms, algae, etc., which grow in large numbers on the base material and grow in clusters.

In order to cut the attached threads from the root, completely remove them, and prevent damage to the inner surface of the tube, a soft resin cylinder was press-fitted to measure the effect, and the results shown in Table 5 were obtained.

Based on the new knowledge obtained from the experiments listed in Table 1 and above, to remove deposits, the brush part of the brush is made of a thick disk of soft resin with a diameter approximately 20% larger than the inner diameter of the pipe, and the brush part is made of a thick disc made of soft resin, and the diameter is approximately 20% larger than the inner diameter of the pipe. The parts were cut into triangular shapes and the structure formed in a moon shape during operation, resulting in the effects shown in Table 6.

Table 6 Removal table of deposits based on thick disc and cut moon shape (Notes) 1. Removal of deposits was carried out on 5 pieces each of 10 to 15 deposits.

2. The effect was calculated from the dry weight of the residue after passing through the brush.

3. The effect is completely achieved when the water pressure is 5 t/cnf or more for each size of the pipe, so the deposit removal part 4 has the above-mentioned structure, and the whole is soft, and the folds of the thick disk 4a are triangular. By making a half-cut to form a moon shape, the attached thread can be cut from the root without damaging the inner surface of the tube, and the attached material can be completely removed.

The deposit removal parts 5 (two in the example) are provided with fins 5b at the tip of a disc 5a made of soft resin, and communicate with the tip side of the injection holes 1b of the main shaft l, and have the same direction. The injection hole 5c is provided at the base so that the injection hole 5c is formed (Fig. 6).

Deposits are waste oil, oily waste, sludge, etc. that settle and stick to the inner surface of the tube, forming a layer and adhering to the inner surface of the tube. Table 7 shows the results of an experiment in which, in order to measure these cleaning effects, a soft resin cylinder was used as a guide, a thick disk was placed at the tapered tip, and a load was applied.

2゜ Table 7 Deposit removal effect experiment table Five test tubes each with an inner diameter of 22.91 mm shall be used as samples.

5゜ During the forward m number, the deposits are completely removed.

Based on the new knowledge obtained from the above experiments, the brush is made of a fin-shaped disk 5% to 20% larger than the inner diameter of the soft resin tube to remove deposits, and it strongly adheres to the tube wall and scrapes the deposits. In addition, an injection hole was provided in the upper part of the fin-shaped disc, and this was used as a water passage communicating with the inner cylinder column to emit a strong vortex flow due to the internal water pressure, and the effects shown in Table 8 were obtained.

Table 8 Deposit removal using fin plates and water jets (remarks) Five pipes each with a deposited layer of 3.1 to 3.8 m were selected.

The effect depends on the weight of the residue.

There is little impact effect on the deposited layer.

If the water pressure is not higher than 4 t/cr1, the jet effect will not appear because the pressure will be reduced midway through.

Therefore, the deposit removal part 5 is configured as described above, and the fins 5b are in close contact with the tube wall to scrape up the deposits, and the fins 5b are connected to the tube wall through the hollow part of the main shaft l, the injection hole 1b, and the injection hole 5c. By generating a vortex between the part 5 and the deposit removing part 5, deposits can be completely removed.

The solid matter removal parts 6 (two pieces in the embodiment) are provided with a group of independent thin spatula-shaped protrusions 6b along the entire outer periphery of a thick disc 6a made of soft resin, and have a main axis l at the root of the thick disc 6a. An injection hole 6C is provided so as to communicate with the rear end side of the injection holes 1b and to be oriented in the same direction (FIG. 7).

Solids are generally formed from crowded substances such as earth, sand, and sludge.
Since extremely hard substances such as quartz particles and iron scraps are mixed in this, the inner surface of the tube, which is narrow between the brush and the tube, is damaged, leading to leakage of the tube. With either conventional brush configuration, it is almost impossible to prevent tube damage, as shown in the experimental results in Table 9.

(Remarks) Table 9 1, the sample tube used was an Alblack tube (made of brass) with a length of 7 m.

3. Five tubes of each size were used.

4. The numerical value is the number of scars without measuring the depth of the scratches.

5. The upper row of the number of scars is from nylon bristles, and the lower row is from a sponge-shaped brush.

From the above experimental results, the structure of the brush has a large influence on the number of scars generated, and even if the pipe diameter becomes larger, the number of scars does not increase significantly, and the number of scars per unit area is almost negligible. I found out that it doesn't change. It was also revealed that the number of scars hardly changes even if the operating water pressure changes.

From this point of view, experiments were conducted using a structure that achieves the first objective of preventing foreign matter from getting caught at the tip of the brush, and the second objective of being able to flush out general solid matter. That is, for the first purpose, independent thin spatula-like scraping mechanisms are clustered around the disc of the laminated parts of the brush to prevent hard particles from getting caught, and for the second purpose By installing injection holes at the top and bottom of this part, the solid material is lifted up by a jet stream and expelled from the pipe, as shown in Table 1O.
The effect was that solid matter could be removed without creating scars.

Table 1: Effect of Solid Removal The residue taken out by the operation was completely dried and then weighed to calculate the percentage.

3.Other details are the same as the notes in Table 9.

Therefore, by configuring the solid matter removal part 6 as described above, it is possible to prevent solid matter from being caught between the protrusion 6b and the inner wall of the tube and damage to the inner surface of the tube caused by this, and also to prevent the hollow part of the main shaft l, Hole 1b and injection hole 6 of this part 6
By generating a jet flow between the inner wall of the tube and the part 6 via C, solid matter can be expelled from the tube.

The spiral groove parts 7 (six pieces in the example) are made of a thick circular plate 7a made of soft resin, with needle bristles 7b growing in clusters over the entire outer periphery (Fig. 8), which are shifted in the circumferential direction in stages. They are set in a layered manner.

The contaminants present in the spiral grooves are initially formed by aerobic or anaerobic bacteria that live in the water and become frog-like, which secrete acidic or alkaline fluids that corrode the tube base material. Furthermore, the occurrence of blue-green algae, green algae, diatoms, etc., the production of cotton-like substances by fungi and filamentous fungi, the occurrence of ciliates and whorls that parasitize these, and the occurrence of algae-eating insects and insectivorous insects that parasitize these. Cumulative occurrence is often seen.

In this way, these fungi, insects, etc. that have a negative impact on the pipe base material spread from the pipe grooves as a starting point and spread throughout the pipe, so it is important to remove foreign substances from the pipe grooves, which are the starting point. It is essential to maintain the functionality of exchangers, etc.

By configuring the spiral groove part 7 as described above,
The tip of the bristles 7b can sufficiently contact the bottom of the groove in the groove to clean it, and can easily bend against the inner surface of the tube in areas other than the groove, so that it does not impede passage of the brush. Further, by stacking the bristles 7b one by one while gradually shifting them in the circumferential direction so that there is no gap between the bristles 7b when viewed from above, the groove portion of the tube can be cleaned more appropriately.

In the hollow portion of the main shaft 1, a plurality of (10 in the embodiment) spiral parts 9 (FIG. 1O) made of soft resin are provided in a stacked manner. The spiral part 9 has a spiral part formed inside a cylindrical body, and if it is set at the position where the injection hole 1b of the main shaft l exists, the cylindrical body is provided with a hole communicating with the injection hole 1b. There is. By forming the spiral portion to rotate in harmony with the groove pitch of the tube, the brush can be rotated and advanced along the groove, thereby further enhancing the cleaning effect of the groove.

The ultra-fine object removal parts 8 (two pieces in the example) are attached to the outer periphery of a short cylindrical guide piece 8a (FIG. 9A) made of soft resin, which has a longer length in the axial direction than the piece 8a. A long tube 8b made of foamed resin (B in the same figure) is fitted, and this long tube 8b
Needle hair 8 with thin hard resin fibers flocked to the entire outer circumferential surface of the
After densely growing C, the surface of the long tube 8b is treated to fix the base with a curing agent containing short fibers of a constant thickness. This makes it possible to completely remove extremely fine powder, tube oxide coating (natural or artificial), fine plankton debris, and various spore-related substances that are not removed by the various parts mentioned above. In addition, by configuring the extremely fine object removal part 8 with two parts, the guide piece 8a and the long tube 8b, the guide piece 8a with a low degree of wear can be repeatedly used, and the long tube 8b with a high degree of wear can be replaced as appropriate. It can also be used as Furthermore, the reason why the length of the guide piece 8a in the axial direction is made shorter than that of the long tube 8b is to allow the long tube 8b to be compressed to some extent by external pressure such as water pressure, but to prevent the long tube 8b from being compressed more than necessary. This is to prevent the brush from expanding excessively in the radial direction and becoming unable to move forward.

Note that the distance between the main shaft l and the parts stacked thereon is as follows:
A set pin lOa that engages with the engagement recess 1c of the main shaft l
By fitting a coronal fastener 10 (FIG. 11) having a
These can be fixedly set from above and below to integrally form the entire brush. Coronary clasp lO1 flat clasp 11 is provided with holes 10b and llb, respectively, which pass through it in the axial direction.

In addition, several slits 10c are provided in the crown of the coronal fastener 10 in order to reduce the impact on the short plates of the heat exchanger, etc., and to prevent damage to the lining of the short plates and attached devices. There is.

Furthermore, by making the axial length of one part equal to or an even multiple of that of the other parts, it is possible to easily combine each part according to the type of foreign matter in the pipe. (Effects of the Invention) As detailed above, according to the present invention, it can be used with appropriate modifications depending on the type of foreign matter to be removed, and
It has the effect of appropriately removing stuck objects and solid objects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the overall structure of an embodiment of a brush for cleaning inside a pipe according to the present invention, and FIGS. 2 to 12 are individual views of each component. 1...Main shaft, lb...Injection hole (hole), 3...Adhesive matter removal parts (parts), 3a...Thick disk, 3b...Thin disk, 4...Adhesive matter Removal parts (parts), 5... Deposit removal parts (parts), 6. Pa. Solid matter removal parts (parts), 6a... Thick disk, Fig. 1 - Protrusion, - Injection hole (hole) , parts for spiral grooves (parts), parts for removing ultra-fine objects (parts), crown clasps (clasps), ・holes, flat clasps (clasps), ・holes. Figure 4 Figure 9 Figure 11 12

Claims (4)

[Claims] (1) A brush for cleaning inside a pipe, characterized in that a plurality of parts having a shape optimal for removing foreign matter to be cleaned are provided in a layered manner around the outer periphery of a cylindrical main shaft made of soft resin. (2) The brush for cleaning inside a pipe according to claim 1, wherein at least one of the plurality of parts is made of a thick disk having a thin disk of hard resin or metal on the upper surface. (3) At least one of the plurality of parts is composed of a thick disk having a plurality of thin spatula-shaped projections on the outer periphery and a hole in the radial direction, and the main shaft has the hole and a hollow part of the main shaft. The brush for cleaning inside a pipe according to claim 1, further comprising holes communicating with the brush. (4) A claim characterized in that a hole communicating with the hollow portion of the main shaft is provided, and a fastener for integrating the main shaft and the plurality of parts is provided on at least one end of the main shaft. The brush for cleaning inside a pipe according to items (1) to (3).