JPH0630745B2 - Brush for cleaning inside pipes - Google Patents

Description

TECHNICAL FIELD The present invention relates to a brush for cleaning an inside of a pipe, which is used for removing foreign matter adhered or adhered to the inside of a pipe, and in particular, the type of foreign matter. The present invention relates to a brush that is appropriately removed according to.

(Prior Art) Conventionally, the performance of these devices is deteriorated by removing the foreign substances that have adhered or deposited inside the various pipes that constitute the heat exchangers, coolers, steam generators, etc. in various production plants. To prevent this from happening, needle hairs, etc. for removing foreign matter are integrally provided on the outer periphery of the flexible cylindrical body, and the inside of the pipe is propelled and rotated by pressured water to remove and clean the foreign matter. A brush is known (for example, Japanese Utility Model Publication No. 58-40895).

(Problems to be Solved by the Invention) However, seawater and freshwater, which are mainly used in heat exchangers including condensers and heaters, contain various miscellaneous substances. It is diverse. The foreign matter in this tube is mainly sticky due to the deposition of deposits, waste oil, oily wastes, sludge, etc. that have grown on the wall of the pipe by growing a large number of attached threads mainly on mussels, sea squirts, diatoms, algae, etc. Deposits that form a layer and adhere to the entire surface of the tube, oysters that form a lime mixture and grow and firmly adhere to the tube wall,
It is formed from solid matters such as barnacles and the like, and generally from contaminants such as earth and sand and sludge, and is classified into solid matters in which extremely hard substances such as quartz particles and iron scrap are mixed.

On the other hand, in the above-mentioned conventional brush, since the main body is rich in flexibility and is configured to remove foreign matters by the group of bristles on the outer periphery thereof, the brush is simply attached or deposited on the tube wall. Although the deposits and deposits can be removed, there is a problem that the deposits firmly fixed to the pipe wall cannot be removed.

In addition, when removing the solid matter, an extremely hard substance such as quartz particles may be sandwiched between the brush and the tube wall, which may damage the tube and cause its leakage.

Furthermore, since the above-mentioned conventional brush is integrally formed with the main body of the bristles for removing foreign matters, it cannot be used properly depending on the type of foreign matter in the tube.

The present invention was made in order to solve the problems of the above-mentioned conventional techniques, and can be appropriately changed and used according to the type of foreign matter to be removed, and also fixed substances and solid substances can be appropriately used. The purpose is to provide a brush that can be removed.

(Means for Achieving the Object) In order to achieve the above object, the brush for cleaning a pipe according to the present invention is
A plurality of parts having a shape optimal for removing foreign matter to be cleaned are provided in a laminated manner on the outer periphery of a cylindrical main shaft made of a soft resin.

(Operation) Since a plurality of parts are set in a laminated form on the outer circumference of the main shaft, the kind, number and arrangement of parts can be freely selected and combined according to the kind of foreign matter.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the brush according to the present invention. In the figure, reference numeral 1 denotes a main shaft of the brush. The main shaft 1 is made of, for example, a soft resin and forms a cylindrical body as shown in FIG. 1a is provided with a plurality of similar injection holes 1b at approximately the middle portion, respectively, at four positions at equal intervals in the circumferential direction, toward the direction slightly toward the tip side from 90 degrees with respect to the axial direction. Four engaging recesses 1c and 1d are provided on the inner peripheral surface of both ends of the main shaft 1 at equal intervals in the circumferential direction. The main shaft 1 is integrated with various parts to be described later, and is propelled by pressurized steam to advance inside the pipe.

A propulsion blade part 2 (FIG. 3) is fitted around the outer periphery of the tip of the main shaft 1. The propulsion blade part 2 has blades 2a on the outer periphery, and a side wall is provided with an injection hole 2b in the same direction as the injection hole 1a at a position matching the injection hole 1a of the main shaft 1. The propelling blade part 2 imparts rotation to the brush by the blades 2a by the jet flow from the jet holes 2b and propels the rotation to promote the cleaning effect of the brush.

Further, on the outer periphery of the main shaft 1, various parts groups that are optimally configured for optimally removing foreign matter in the pipe according to the type thereof are fitted and laminated. That is, the parts group includes, in order from the tip side, the adhered matter removing part 3, the adhered matter removing part 4,
It is composed of a deposit removing part 5, a solid removing part 6, a spiral groove part 7 and an ultrafine object removing part 8.

The adhered matter removing part 3 (FIG. 4) is composed of two parts. The tip side part is, for example, a hard resin or metal thin film on the tip side surface of a thick disc 3a made of hard resin (A in the figure). It is configured by attaching a disc 3b (B in the figure), and the part on the rear end side is configured only by the thick inner plate 3a. This thick disk 3a
The outer diameter of is smaller than the outer diameter of the disk of each part described later. Such a configuration of the adhered substance removing part 3 is based on the following experimental results (Tables 1 to 4).

Fixed matter is formed mainly by living things, and in seawater,
Oysters and barnacles are mainly oysters and barnacles, which vary depending on the cold current region.Eggs become plankton, and when they migrate and attach to adherends, they become soft and gel-like adults. As shown in Table 1, it is relatively easy, but it takes about 2 weeks to form a lime mixture from the root, grow and firmly adhere to the adherend, and it becomes gradually difficult to remove it from the root. However, there was a relatively soft part of the lime mixture layer about 2 mm above the root, and the effect shown in Table 2 was obtained by the method of destroying and removing this part. Table 3 shows the load used for this fracture removal converted to water pressure. From these tables, the water pressure required to effectively remove the lime mixture layer from the soft part is limited by the strength of the pipe. It turns out that it stays within the usable range.

It was also confirmed that if a part of such a lime mixture layer was removed, the remaining living body would gradually die without causing eddy current corrosion.

Furthermore, it was confirmed that the scale-like high-temperature corrosive pieces of stainless steel pipe generated by high-temperature fresh water or steam also form adherents, but these can also be removed by the above-mentioned method.

From the various new findings obtained from the above experiments, we conducted an experiment to remove adhered substances with a structure in which a hard resin or metal plate was attached to the surface of the thick disk part of the brush, and the effects shown in Table 4 Got

Therefore, the adhered matter removing part 3 is configured as described above, and a thin plate 3b made of hard resin or metal is used to remove a part of the lime mixture layer of oysters, barnacles, etc. to kill the remaining living body, and to use stainless steel. It is possible to effectively remove adhered substances such as scale-like high temperature corrosive pieces of the pipe.

The attached matter removing parts 4 (two in the embodiment) are formed by half-cutting the folds of the thick disc 4a made of soft resin in a triangular shape over the entire circumferential direction (FIG. 5).

The attached substances are mainly mussels, squirts, diatoms, algae, etc., and a large number of attached threads grow to form clusters on the base material.

The effect was measured by press-fitting a cylinder of soft resin in order to completely remove the adhered thread from the root, remove it completely, and not damage the inner surface of the tube. The results shown in Table 5 were obtained.

Based on the new knowledge obtained from the above experiments, the brush parts of the brush are made thick disk of soft resin, the diameter is about 20% larger than the inner diameter of the pipe, and the place where the surface folds The effect shown in Table 6 was obtained as a structure in which the blade was cut into a triangular shape to form a blade shape during operation.

Therefore, the adhered matter removing part 4 is configured as described above and is soft as a whole, and the thick disk 4a forms a blade shape by a half-cut with a triangular shape, thereby adhering without damaging the inner surface of the pipe. The thread can be cut from the root to completely remove the deposits.

The deposit removing parts 5 (two in the embodiment) are provided with fins 5b at the tip of a soft resin disk 5a, communicate with the tip side of the injection hole 1b of the main shaft 1, and have the same direction. Therefore, the injection hole 5c is provided at the base (FIG. 6).

The deposit is a deposit of waste oil, various oily wastes, sludge, etc., which sticks to the inner surface of the pipe, forms a layer, and adheres to the entire inner surface of the pipe. Table 7 shows the results of an experiment in which a soft resin cylinder was used as a guide and a thick disk was provided at a portion where the tip was thinned and a load was applied in order to measure these cleaning effects.

Based on the new knowledge obtained from the above experiments, the brush was made a fin-shaped disc 5% to 20% larger than the inner diameter of the soft resin tube to remove the deposit, and the deposit was scratched by firmly adhering to the tube wall. The effect shown in Table 8 was obtained as a structure in which a jetting hole was provided in the upper part of the fin-shaped disc, and a strong vortex flow was jetted out by the internal water pressure as water passage communicating with the inner cylindrical column.

Therefore, the deposit removing part 5 has the above-described configuration, the fins 5b strongly adhere to the pipe wall to scrape up the deposit, and through the hollow portion of the main shaft 1, the injection hole 1b and the injection hole 5c, to the pipe wall. By generating a vortex between the deposit removing part 5 and the deposit removing part 5, the deposit can be completely removed.

In the solid matter removing parts 6 (two in the embodiment), independent thin spatula-shaped projections 6b are grouped over the entire outer circumference of a thick disc 6a made of a soft resin, and the spindle 1 is provided at the base of the thick disc 6a. The injection holes 6b are provided so as to communicate with the rear end side of the injection holes 1b and have the same direction (FIG. 7).

Solid matter is generally formed from sediment such as sediment and sludge,
Since extremely hard substances such as quartz particles and iron scraps are mixed in this, the narrow inner surface of the tube between the brush and the tube is damaged, resulting in leakage of the tube. As shown in the experimental results in Table 9, it is almost impossible to prevent damage to the tube with any shape of the conventional brush.

From the above experimental results, it is the structure of the brush that is significantly involved in the number of dents that occur, and the number of dents does not increase so much even when the pipe diameter increases, and it is almost the same per unit area. I found that it didn't change. It was also clarified that the number of traces hardly changed even when the operating water pressure changed.

From such a point of view, an experiment was performed by a structure that achieves the first purpose of preventing foreign matter from being caught at the tip of the brush and the second purpose of being able to flow out general solid matter. That is, for the first purpose, a group of independent thin spatula-like scraping mechanisms are clustered around the laminated part disk of the brush to prevent hard particles from being caught, and for the second purpose. By providing the injection holes above and below this part to remove the solid matter outside the pipe while winding it up with a jet flow, as shown in Table 10,
It was possible to remove the solid matter without making a trace.

Therefore, by configuring the solid matter removing part 6 as described above, it is possible to prevent the solid matter from being caught between the projection 6b and the inner wall of the pipe and to prevent the inner surface of the pipe from being damaged, and to prevent the hollow portion of the main shaft 1 and the injection. Hole 1b and injection hole 6 of this part 6
By generating a jet flow between the inner wall of the pipe and the part 6 via c, the solid matter can be removed outside the pipe.

The spiral groove parts 7 (six pieces in the embodiment) are formed by clustering the bristles 7b over the entire outer circumference of the thick disc 7a made of soft resin (Fig. 8), which are shifted in the circumferential direction step by step. They are set in layers.

The pollutants intervening in the spiral groove initially form aerobic or anaerobic bacteria that live in water to form a frog, which secretes an acidic or alkaline liquid and corrodes the pipe base material as well. In addition, the occurrence of cyanobacteria, green algae, diatoms, etc., generation of cotton-like substances by fungi and filamentous fungi, the occurrence of ciliates, larvae, etc. parasitic on them, the occurrence of algae-eating insects and carnivorous insects Often see cumulative occurrences.
As described above, since these fungi, insects, etc., which adversely affect the pipe base material, spread over the entire pipe by using the pipe groove portion as the starting point, it is necessary to remove the foreign matter in the pipe groove portion as the starting point. It is indispensable for maintaining the functions of exchangers.

By configuring the spiral groove part 7 as described above,
The tip of the bristles 7b is sufficiently abutted on the groove bottom at the groove portion to clean it, and since it is easily bent by hitting the inner surface of the tube at a portion other than the groove portion, it does not hinder the passage of the brush. In addition, the needle bristles 7b are stacked one by one in the circumferential direction,
By setting the state in which there is no gap between the bristles 7b when viewed from above, the groove portion of the tube can be cleaned more appropriately.

A plurality of (10 in the embodiment) spiral parts 9 (FIG. 10) made of a soft resin are laminated and provided in the hollow portion of the main shaft 1. The spiral part 9 is formed by forming a spiral portion inside the cylindrical body, and the spiral part 9 is set at a position where the injection hole 1b of the main shaft 1 is present, and the cylindrical body is provided with a hole communicating with the injection hole 1b. There is. By forming the spiral portion so as to rotate in harmony with the groove pitch of the tube, the brush can be advanced while rotating along the groove, and the cleaning effect of the groove can be further enhanced.

The ultrafine object removing parts 8 (two in the embodiment) are made of a soft resin and have a shorter tubular guide piece 8a (Fig. 9A) on the outer periphery thereof. The long cylinder 8b made of foamed resin (see FIG. B) is fitted to the long cylinder 8b.
On the outer peripheral surface of the needles 8
After densifying c, the root of the long tube 8b is fixed by a hardening agent containing short fibers having a constant thickness. As a result, it is possible to completely remove extremely fine ultrafine powder, tube oxide film (natural or artificial) fine plankton debris, and various spore-related substances that are not removed by the above-mentioned various parts. Further, by constructing the ultrafine object removing part 8 with two parts, the guide piece 8a and the long cylinder 8b, the guide piece 8a having a small degree of wear is repeatedly used, and the long cylinder 8b having a large degree of wear is appropriately replaced. It can also be used. Further, the length of the guide piece 8a in the axial direction is made shorter than that of the long cylinder 8b by allowing the long cylinder 8b to be compressed to some extent by an external pressure such as water pressure, but by compressing more than necessary, the radial direction This is to prevent the brush from advancing excessively and becoming unable to advance.

In addition, between the main shaft 1 and the parts laminated on the main shaft 1,
Set pin 10a that engages with the engagement recess 1c of the main shaft 1
By fitting a coronal fastener 10 (Fig. 11) having a flat fastener 11 (Fig. 12) having a set pin 11a that engages with the engaging recess 1d of the spindle 1,
These can be fixedly set from above and below to integrally form the entire brush. The coronal fastener 10 and the flat fastener 11 are provided with holes 10b and 11b penetrating in the axial direction, respectively.

Further, the crown portion of the coronal fastener 10 is provided with several slits 10c in order to alleviate the impact on the crown plate of the heat exchanger or the like and prevent the lining of the crown plate and the damage to the accessory. There is.

Furthermore, by making the axial length of one part equal to that of the other part or by making it an even multiple, the parts can be easily combined according to the type of foreign matter in the pipe.

(Effects of the Invention) As described in detail above, according to the present invention, it is possible to appropriately change and use according to the type of foreign matter to be removed,
This has the effect of being able to appropriately remove adhered substances and solid substances.

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall construction of an embodiment of a brush for cleaning an inside of a tube according to the present invention, and FIGS. 2 to 12 are unit drawings of respective parts. 1 ... spindle, 1b ... injection hole (hole), 3 ... adhered matter removing part (part), 3a ... thick disk, 3b ... thin disk, 4 ... adhesion removing part (part), 5 ... Deposit removal parts (parts), 6 ... Solids removal parts (parts), 6a ... Thick disk, 6b ... Projections, 6c ... Injection holes (holes), 7 ... Spiral groove parts (Parts), 8 ... Ultrafine object removal parts (parts), 10 ... Coronal fasteners (fasteners), 10a ... Holes, 11 ... Flat fasteners (fasteners), 11a ... Holes.

Claims (3)

[Claims] 1. An outer periphery of a cylindrical main shaft made of a soft resin,
A plurality of parts having a shape optimal for removing foreign matter to be cleaned is provided in a laminated form, and at least one of the plurality of parts is a thick disk having a thin disk of hard resin or metal on the upper surface. This is a brush for cleaning inside pipes. 2. At least one of the plurality of parts comprises a thick disc having a plurality of thin spatula-shaped projections on the outer periphery and a hole in the radial direction, and the main shaft is provided with a hollow of the hole and the main shaft. A hole for communicating with the section is provided,
The brush for cleaning inside the pipe as described in (1). 3. A fastener provided with a hole communicating with a hollow portion of the main shaft, for integrating the main shaft and the plurality of parts,
The pipe cleaning brush according to claim (1) or (2), wherein the brush is provided on at least one of the ends of the main shaft.