JP2002316113A - Tube cleaning tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube cleaning tool which can remove various foreign matters generated in various kinds of tubes, without damage to films within the tubes. SOLUTION: Bristles of a nylon brush body 2 of a proper hardness are planted on the outer periphery of a cylindrical polyethylene core body 1 in a plurality of helical lines to forcibly scrape off foreign matters attached to the inside surface of a tube. An approximately semispherical push-out body 3 having an outer diameter slightly smaller than the inner diameter of the tube is provided at the forward end of the core body 1. A plurality of spray holes 1A are formed through a side of the forward end of the body 1 to spray pressure waster on the inside surface of the tube from within the body 1. A flange-like urging part 4 with a diameter slightly smaller than the inner diameter of the tube is provided at the rear end of the body 1. The bristles of the body 2 are planted densely so that each helical line of the bristles forms an approximately belt-like shape, thereby driving rotary forces for the brush body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe cleaning tool for removing foreign matter adhering to the inner wall of a pipe, and more particularly to a condenser, an oil cooler, and various types of heat used in a nuclear power plant or a thermal power plant. By extruding impurities such as sludge and sand inside the tubes by ejecting pressure water into the inside of thin tubes such as exchangers, it is possible to remove hard scales such as scales and shells attached to the inner surface of the cooling tube. The present invention relates to an in-pipe cleaning tool that is suitable for:

[0002]

2. Description of the Related Art Shells, diatoms, algae, etc. are attached to the inside of thin tubes used for condensers used in nuclear power plants and thermal power plants, and heat exchangers using seawater. Kimono, waste oil, oily waste, sludge and the like may stick and adhere to the inner surface of the pipe as a layered deposit. Also,
There are also hard scales such as barnacles that grow while forming a lime mixture and are firmly fixed to the tube wall. There are several types of in-pipe cleaning tools for removing such foreign substances, in particular, for in-pipe cleaning tools for removing and cleaning foreign substances by injecting pressure water into the pipe and propelling the pipe by water pressure to remove the foreign substances.

The first type is an in-pipe cleaning tool called a bullet-shaped plug made of a foamed elastic material. This type uses a foamed elastic material, and abrasion-resistant skin is applied to the entire surface or a part of the plug, and a bullet-type cleaning tool in a pipe with a projection or groove on the surface of the plug is also available. (Eg, JP-A-54-84359). This bullet-type in-pipe cleaning tool is used particularly for U-tubes and serpentine pipes.

[0004] A second type is a brush-type in-pipe cleaning tool. For example, a brush (Japanese Utility Model Publication No. 58-40895) in which a bristle or the like for removing foreign matter is integrally provided on the outer periphery of a flexible cylindrical body, or a hard synthetic resin having a cylindrical shape The outer surface of the core body is made of nylon with a length slightly longer than the inner diameter of the cooling pipe and of appropriate hardness, and several tens of hairs for removing hard scale such as scales and shells on the inner surface of the cooling pipe are separated at appropriate intervals. In addition, there is a brush-shaped cleaning tool in a pipe in which a plurality of rows are spirally implanted (utility model registration No. 3031967). Such a cleaning brush is inserted into the cooling pipe, water is fed at a high pressure, and a brush-type cleaning tool in the pipe that moves the cleaning brush from one end side to the other end side of the cooling pipe, particularly, peels off foreign substances, Suitable for sweeping out work.

[0005] A third type is an in-pipe cleaning tool provided with a plurality of fins on the outer periphery of a core body (for example, Japanese Patent Laid-Open No. 2000-343).
No. 056). The in-pipe cleaning tool described in this publication has, in particular, fins spaced apart from each other in the axial direction and displaced from each other in the circumferential direction. Further, in Japanese Patent Publication No. Hei 6-30745, a ring-shaped fixing substance removing fin, an adhering substance removing fin, and a deposit removing fin are fixed to the outer peripheral portion of the core body, and each of them is made of metal and hard resin and soft resin. Is described. Such a type is referred to as a fin-type in-pipe cleaning tool for convenience. This type of in-pipe cleaning tool is suitable for removing sludge and the like in a new pipe.

[0006]

Although these in-pipe cleaning tools have the above-mentioned advantages by type, they also have the following problems. The first bullet-type in-pipe cleaning tool generally forms a shell-shaped plug with a polyurethane foam, so that when the pipe passes through a bend portion, a T-shaped portion, or the like of the pipe, a large pull or compression of the plug occurs. However, there were problems in durability, such as damage to the plug body and skin.

The second brush type cleaning tool in a tube, which is configured to remove foreign matter by means of a bristle group or the like on the outer periphery of a flexible body, simply adheres or deposits on the tube wall. Although foreign matter such as sludge can be removed, there is a problem in that it is not possible to remove fixed substances firmly adhered to a tube wall such as a shellfish. Further, when the core is made of metal, the weight is heavy and the speed at which the inside of the pipe is propelled and rotated by pressurized water is inferior, so that the efficiency of the cleaning operation is reduced. Furthermore, if the core is made of metal, it is necessary to separate and discard the brush portion of the synthetic resin material and the core, and there is also an inconvenience that much time is required for retirement and disposal after use.

Further, in a third fin-type in-pipe cleaning tool, a ring-shaped fixed matter removing fin, an attached matter removing fin, and a deposit removing fin are fixed to an outer peripheral portion of the core body,
In an in-pipe cleaning tool made of a metal, a hard resin and a soft resin, it is necessary to assemble and configure a plurality of parts because the material of each fin is different, and there is a problem that the unit price is increased. Further, there is a problem that the metal fins increase the weight and easily damage the inner wall of the tube. On the other hand, in an in-pipe cleaning tool in which the fins are separated from each other in the axial direction and are shifted from each other in the circumferential direction, the fins are separated from each other in the axial direction and are shifted in the circumferential direction. Since the number is small, some fins may be worn or damaged, which may cause uneven cleaning inside the pipe.

Further, a problem common to the second and third types is that the coating inside the tube is damaged. For example,
An iron coating is formed inside the brass tube used in some thermal and nuclear power plants, but there was the inconvenience that the iron coating was peeled off when the pipe cleaning tool was forcibly inserted. .

In view of the above problems, the inventor of the present invention has intensively studied to provide an in-pipe cleaning tool which can remove various foreign substances generated in various pipes without damaging the film inside the pipe. As a result, by improving the brush-type cleaning tool inside the pipe, it is possible to efficiently extrude impurities such as sludge and sand inside the cooling pipe without damaging the coating inside the pipe and efficiently remove hard scales such as scales and shellfish on the inner surface of the cooling pipe. In addition to being able to remove reliably, hard scales such as scales and shells around the irregularities on the inner surface of the cooling pipe are surely removed, shortening the running time in the cooling pipe, and improving the efficiency of cleaning work. Another object of the present invention is to provide an in-pipe cleaning tool which enables recycling after use and makes disposal after use extremely easy.

[0011]

Means for Solving the Problems In order to achieve the above object, a first means of the present invention is to remove foreign matter adhering to the inner surface of a tube on the outer peripheral surface of a cylindrical polyethylene core body 1. A single or a plurality of spirally brushed nylon brushes 2 of appropriate hardness, which are forcibly scraped off, are implanted in a spiral shape, and a substantially hemispherical shape having an outer diameter slightly smaller than the inner diameter of the tube is provided at the tip of the core body 1. Extruded body 3
And a plurality of injection holes 1A for injecting pressurized water from the inside of the core 1 to the inner surface of the tube are opened in the side of the front end of the core 1, and the inner end of the tube is provided at the rear end of the core 1. A brim-shaped pressing portion 4 which is set slightly smaller than that is provided. The pressure water injected from the injection hole 1A promotes the action of the brush body 2 scraping off foreign matter without damaging the coating inside the tube in cooperation with the nylon brush body 2.

The brush body 2 of the second means is densely implanted so that the spiral of each strip forms a substantially strip shape, and is provided so as to promote the rotational force of the brush body 2 by the pressurized water. . The shorter the bristle length of the brush body 2, the higher the durability and strength.

The third means is to provide a buffer slit 3A on the peripheral side surface of the extruded body 3 to reduce the impact on the inside of the tube and prevent damage to the lining and accessories in the tube. The buffering slit 3A is used to relieve a shock caused when it collides perpendicularly to the side surface of a pipe such as a U-shaped pipe. When the peripheral edge of the shell comes into contact with foreign matter inside the pipe, even a fixed substance such as a shellfish can be broken.

The fourth means is that the core 1 is provided at the rear end thereof.
A plurality of rear injection holes 1B for injecting pressurized water from the inside to the inner surface of the pipe are formed. Rear injection hole 1B
Does not promote the action of scraping off foreign matter with the brush body 2 like the front injection hole 1A, but has the action of sending the once scraped foreign matter to the rear of the core body 1.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. The basic configuration of the present invention includes a core 1, a brush 2, an extruded body 3, and a pressing portion 4 (see FIG. 1).

The core 1 is a cylindrical body made of polyethylene, and a single-strength nylon brush 2 of appropriate hardness for forcibly scraping off foreign substances adhering to the inner surface of the tube is provided on the outer peripheral surface of the core 1. Or it is implanted in a plurality of spirals (see FIG. 1). Although the illustrated brush body 2 forms a plurality of spirals to enhance the peeling effect, it is also possible to form a single spiral.
Further, an extruded body 3 described later is provided at the tip of the core body 1. Further, a plurality of injection holes 1A are provided on the side surface of the distal end portion of the core body 1.
Is provided so that when the pipe cleaning tool of the present invention is fed into the pipe by pressurized water, the pressurized water is sprayed from the inside of the core body 1 to the inner surface of the pipe (see FIG. 3). ). After the pressurized water injected from the injection hole 1A is sprayed on the foreign matter on the inner wall of the tube, the brush body 2 scrapes out the foreign matter. Therefore, the injection hole 1A is formed in a reverse tapered shape so that the front end of the injection hole 1A spreads so that the pressurized water can be uniformly sprayed to the foreign matter in the tube wall. Injection hole 1A shown
Has four injection holes 1A radially, but the number of the injection holes 1A can be set arbitrarily.

The rear end of the core 1 also has a plurality of rear injection holes 1B for injecting pressurized water from inside the core 1 to the inner surface of the pipe.
(See FIG. 1). This rear injection hole 1B is
Unlike the front injection hole 1A, it does not promote the action of scraping off foreign matter with the brush body 1, but has an action of sending the once scraped foreign matter to the rear of the core body 1. After the foreign matter is scraped off, it is prevented from adhering to the inner surface of the pipe again. In the illustrated example, two rear injection holes 1B are provided, but the number of the rear injection holes 1B can be arbitrarily set similarly to the number of the injection holes 1A.

The brush body 2 is densely implanted so that the spirals of the respective strips form a substantially strip shape, and the brush body 2 is formed by pressurized water.
(See FIG. 2). The brush part 2 is optimally made of a nylon brush, and the shorter the bristle length of the brush body 2, the higher the durability and strength. Further, a brush body 2 having a short length is suitable for removing a fixed substance such as a shell, and a brush body 2 having a relatively long hair is suitable for removing a foreign substance such as sludge. In the case where the type of the foreign matter is apparent as described above, more effective cleaning can be performed by changing the length of the bristle feet according to the type of the foreign matter.

The extruded body 3 is a hemispherical projection provided at the tip of the core body 1 and has an outer diameter slightly smaller than the inner diameter of the tube. And, on the peripheral side surface of the extruded body 3, there is provided a buffer slit 3A for alleviating the impact on the inside of the tube and preventing damage to the lining and accessories in the tube (see FIG. 2). This buffer slit 3A is, for example, a U-shaped tube,
The extruding body 3 is designed to relieve the shock when it collides perpendicularly to the side of the pipe. It can also be broken down by fixed objects such as shellfish.

The pressing portion 4 has a brim shape slightly smaller than the inner diameter of the tube, and is provided at the rear end of the core 1. When the in-pipe cleaning tool of the present invention is inserted into one end of the pipe to be cleaned, and the pipe tip of a jet gun (not shown) is applied to the mouth of the pipe to spray pressure water, water pressure is applied to the pressing portion 4 and a part of the pressure is applied. While re-injecting the pressurized water from the injection hole 1A and the rear injection hole 1B, the inside of the pipe is turned and travels to remove foreign matter.

[0021]

According to the present invention, the above object has been attained.

That is, a brush body 2 provided on the outer peripheral surface of a polyethylene core body 1 having a cylindrical shape, an extruded body 3 provided on a tip end of the core body 1, and a tip end side face of the core body 1 are perforated. By providing the injection hole 1A described above, it became possible to peel off foreign substances such as shellfish and to sweep out with a brush and remove sludge and the like in the pipe without damaging the film inside the pipe. Further, since it can be used for a U-tube or a serpentine tube, it can be removed according to various foreign substances generated in various tubes.

The brush body 2 is planted in a dense state so that the spirals of the respective strips form a substantially strip shape, and is provided so as to promote the rotational force of the brush body 2 by pressurized water. Combined with pressurized water sprayed from 1A, it removes hard matter such as shellfish, diatoms and algae and hard scales such as barnacles without damaging the film inside the tube, We succeeded in scraping off sticky substances such as waste oil, oily wastes, and sludge that formed in layers.

Further, a buffer slit 3A is provided on the peripheral side surface of the extruded body 3 to reduce the impact on the inside of the pipe and to prevent damage to the lining and accessories of the inside of the pipe. It can reduce the shock of a vertical collision with the side of the tube. Moreover, the rotating extruded body 3
When the peripheral side edge of the extruded body 3 comes into contact with foreign matter inside the pipe due to the rotational speed and the injection speed of the pressurized water, even a fixed substance such as a shellfish can be broken.
And other synergistic effects.

Further, a plurality of rear injection holes 1B for injecting pressurized water from the inside of the core body 1 to the inner surface of the pipe are formed at the rear end of the core body 1 so that the scraped foreign substances can be removed. It is sent to the back of the body 1 to promote the discharge of foreign matter. Further, there is also an effect of preventing an adhesive foreign substance from adhering to the pipe wall surface again.

As described above, according to the present invention, it is possible to adapt and remove various foreign substances generated in various pipes without damaging the film inside the pipes, and to remove sludge and sand inside the cooling pipes. In addition to efficiently removing hard scales such as scales and shells on the inner surface of the cooling pipe while extruding impurities, it is also possible to reliably remove hard scales such as scales and shells around irregularities on the inner surface of the cooling pipe. In addition, there is an effect that recycling after use is possible and disposal after use can be extremely simplified.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing an extruded body of the present invention.

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

[Explanation of symbols]

 Reference Signs List 1 core body 1A injection hole 1B rear injection hole 2 brush body 3 extruded body 3A buffer slit 4 pressing part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B08B 9/053 B08B 9/02 B F28G 3/04 C 3/16 9/04 Z F-term (Reference) 3B116 AA13 AB54 BA02 BA12 BA36 BB23 3B202 AA00 BA03 BC01 BE01 EA01

Claims (4)

[Claims] 1. A single or plural spiral brush made of a suitably hard nylon brush for forcibly scraping off foreign substances adhering to the inner surface of a tube is provided on the outer peripheral surface of a cylindrical polyethylene core. A plurality of extruded bodies having a substantially hemispherical shape having an outer diameter slightly smaller than the inner diameter of the pipe are provided at the tip of the core, and pressure water is sprayed from the inside of the core to the inner surface of the pipe. An in-pipe cleaning tool, characterized in that an injection hole is formed in a side surface of a front end portion of a core body, and a collar-shaped pressing portion set slightly smaller than an inner diameter of the pipe is provided at a rear end portion of the core body. 2. The brush body according to claim 1, wherein the brush body is planted in a dense state so that the spiral of each strip forms a substantially strip shape, and is provided so as to promote the rotational force of the brush body by pressurized water. In-pipe cleaning tool. 3. The cleaning tool in a pipe according to claim 1, wherein a shock-absorbing slit is provided on a peripheral side surface of the extruded body to reduce an impact on the inside of the pipe and prevent damage to a lining and an accessory in the pipe. . 4. A pipe cleaning tool according to claim 1, wherein a plurality of rear injection holes for injecting pressurized water from inside the core to the inner surface of the pipe are formed in a rear end of the core. .