JPH081119A - Intratube cleaning of existing piping - Google Patents

Abstract

PURPOSE:To clean the inner surface of a pipe efficiently by sending a specified vegetable cleaning liquid forcibly through piping to be cleaned through an ejector using a compressed air at less than a specified pressure level, and giving a flow force and a stirring force to the cleaning liquid to clean the inner surface of the pipe by inflating the compressed air. CONSTITUTION:A water feed piping system consists of a water control valve 2 arranged in a main tubular path 1 branching from main water suction pipe and also a tubular path 3 to be cleaned arranged downstream. In this case, a branch pipe 11 is installed in the downstream side of the water control valve 2, and at the same time, an ejector 13 is arranged on piping for cleaning 12 connected to the branch pipe 11. In addition, a compressed air feed pipe 17 leading from a compressor 16 is connected to the primary side of the ejector 13 through a throttle valve 15, and at the same time, a feed pipe 18 of an adjusted cleaning liquid is connected to likewise the secondary side, and is provided with a flowmeter 19. A vegetable cleaning liquid consisting of a vegetable fat preparation mixed with a nonionic surfactant is diluted to a specified concentration, and this diluted cleaning liquid is fed under pressure into the tubular path 3 using a compressed air at 1kg/cm<2> max.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a water supply line, a drainage line,
Alternatively, the present invention relates to a method for cleaning an inside pipe of an existing pipe for cleaning the inside surface of a pipe such as an equipment machine having a pipe line.

[0002]

2. Description of the Related Art Conventionally, it has been necessary to clean a piping system of a water supply / drainage facility in a high-rise apartment house, a factory or the like regularly or irregularly to keep it hygienic.
In particular, cleaning of water tanks in the water supply system of high-rise apartments is legalized and obligatory. Naturally, it is desired that the water supply pipe system connected to the water storage tank be cleaned to be kept in a sanitary good condition. Further, in a drainage system in a food factory or the like, it is necessary to remove the adherence of oil and fat residue and facilitate the decomposition process.

In order to remove scales, scales, rust, etc. in such a piping system, it is necessary to enhance the cleaning effect and take care so that the waste water does not cause environmental pollution. Generally, a method of cleaning using a cleaning solution with high resolution is adopted. However, in the water supply pipe system, the impurities cannot be removed promptly after the cleaning, so that there is a problem that the drinking water system cannot be used until a considerable time has elapsed after the cleaning treatment. Therefore, an attempt to solve such a problem has already been proposed. As one example, there is a means disclosed in Japanese Patent Laid-Open No. 3-258382.

[0004]

In the above-mentioned prior art, the plant-based cleaning liquid mixed with a separating agent, a surfactant and a high wetting agent is diluted to a required concentration and then charged into a pipe system, and then the cleaning liquid is added. The air pressure is 3.5 to 3.0 K due to the pressure feeding device.
It is disclosed that the inside of the pipe is cleaned by pressurizing compressed air of gf / cm2.

However, in such a system, since the cleaning liquid is injected and filled in the pipe line and then high-pressure compressed air is press-fitted into the pipe line filled with the cleaning liquid for cleaning, the piping system is large. External force will be applied and will have a great impact on the joints and other parts. Also, once the pipe is filled with the cleaning liquid and the compressed air is injected afterwards, it becomes the main flow in the straight pipe section.In other words, even if it is effective in the main pipe section, even the details branched like a branch pipe Has a problem that the compressed air does not reach and the pressure of the fluid in the pipeline is increased unnecessarily, and the piping is damaged.

The present invention solves these problems and
The cleaning liquid can be mixed while sending it into the pipeline by using low-pressure compressed air, and the inside of the existing pipeline can be cleaned more effectively by utilizing the stirring force of the liquid by releasing the pressure of diffusion injection pressure air. The purpose is to provide a method.

[0007]

[Means for Solving the Problems] A method for cleaning the inside of an existing pipe according to the present invention configured to achieve such an object is a plant-based cleaning liquid in which a nonionic surfactant is mixed with a plant-based oil and fat agent. The diluted cleaning liquid is diluted to the required concentration and sent into the cleaning target pipe by the ejector using compressed air with a pressure of 1 Kgf / cm2 or less. Is applied to clean the inner surface of the pipe, the stopper at the end of the pipe is opened to discharge the cleaned liquid, and then the cleaning is finished with clean water.

In order to inject the cleaning liquid into the existing pipeline, a cleaning liquid injection pipe is connected to the target existing pipeline, an air ejector is attached to the cleaning liquid injection pipe, and the nozzle side (primary side) of the air ejector is attached. ) Is supplied with compressed air from an air compressor, and a supply pipe for diluted cleaning liquid is connected to the suction pipe (secondary side) to supply the cleaning liquid into the pipeline while adjusting the supply of compressed air. Prior to the cleaning, the water supply source side of the line to be cleaned is shut off by a water control valve, and then the cleaning is performed.

The concentration of the washing liquid used varies depending on the pipeline to be washed, but generally, the plant washing liquid and water are diluted at a ratio of 1:20 to 1:40.

Further, in the present invention, it is preferable that the primary side compressed air is jetted intermittently in the ejector so that the suction injection operation of the secondary side diluted cleaning liquid is intermittently performed. Then, it is preferable that a discharge detecting means is provided at a terminal portion of the cleaning pipe to discharge the cleaning liquid while confirming the cleaning state in the pipe.

[0011]

According to such a method for cleaning an existing pipeline of the present invention, a required concentration is set for a pipeline to be cleaned in consideration of a usage state of the pipeline to be cleaned. The diluted cleaning liquid (hereinafter simply referred to as “cleaning liquid”) is attached to the cleaning pipe in advance at a suitable position, and the cleaning liquid supplied to the secondary side is compressed air supplied to the primary side of the ejector provided in the cleaning pipe prepared in advance. Pressure is injected into the washing line. Then, the cleaning liquid is pressurized by the injected compressed air and injected into the residual liquid in the pipeline, and at the same time, the injected compressed air is dispersed to mix and diffuse the liquid, and the liquid is agitated. The fluidity of the liquid is increased along the inner wall surface of the pipe, and the film flow is promoted, so that the cleaning effect is improved. In particular, the compressed air injected as microbubbles in the liquid promotes the diffusion flow of the cleaning liquid, and at the same time, the pressure of these microbubbles is released as they move to the end, whereby the cleaning liquid and the residual liquid are agitated, and the chemical composition of the cleaning liquid is increased. In addition to the detergency, a physical detergency function is exerted, and a prompt detergency is performed. And the compressed air used can achieve the purpose at low pressure, so that no excess air is injected,
Therefore, the pipe line is not damaged because the pipe system is not violently vibrated when the pressure of the compressed air is released.

Further, according to the present invention, when the cleaning liquid is sent into the conduit by compressed air as described above, if the cleaning liquid is intermittently injected as needed, the impact on the conduit can be reduced and the cleaning liquid is injected. The flow conditions can be optimized by adjusting the feed rates of the cleaning liquid and compressed air. Then, if a discharge detecting means is provided at the end of the pipe to be cleaned to check the state of the cleaning drainage, the cleaning efficiency in the pipe can be improved by discharging it under a good cleaning condition. Can be increased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example of the method for cleaning an existing pipeline according to the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a general water supply pipe system, in which a water control valve 2 is arranged in a main pipe line 1 branched from a water supply main pipe, and a water control valve 2 is provided downstream of the water control valve 2. The pipeline 3 to be cleaned is provided. In such a water supply pipe system, a branch pipe 11 is attached at an appropriate position on the downstream side of the water control valve 2.
The ejector 13 is attached to the cleaning pipe 12 connected to the branch pipe 11.
The compressed air supply pipe 17 from the compressor 16 is connected to the primary side (injection nozzle side) of the ejector 13 with the throttle valve 15 interposed. A supply pipe 18 for the adjusted cleaning liquid is connected to the secondary side of the ejector 13, and a flow meter 19 is preferably provided in the supply pipe 18. The cleaning liquid is put into a tank 21 capable of holding an appropriate amount and sucked and supplied by a siphon, or supplied by a small pump.

The cleaning liquid used is a neutral detergent mainly composed of natural components, such as EP-680 (a tall oil, an amine-based nonionic activator and a higher alcohol-based ionic activator as main components). Use a diluted cleaning solution prepared by diluting a neutral detergent (trade name, manufactured by Diana Corporation, USA) with water. As a diluting concentration of the cleaning agent, in the case of removing water stains, rust, etc. in the pipe, a ratio of clean water 40 to cleaning agent (liquid) 1 can be used. Of course, the ratio is not limited to this, and may be 1:30 or more, or about 1:20 depending on the degree of adhesion of scale or the like.

By preparing such a concentration-adjusted cleaning liquid, the water control valve 2 on the upstream side of the target pipeline 3 to be cleaned is closed, and thereafter, the compressed air (1
Ejector 13 Kgf / cm2 or less, eg 0.8 Kgf / cm2)
The diluted cleaning liquid is suction-supplied from the tank 21 connected to the secondary side while being supplied to the primary side.

Then, due to the suction function of the ejector 13, the diluted cleaning liquid is injected into the cleaning target pipe line 3 through the cleaning pipe 12. Since the water that has stagnated due to the closing of the water control valve 2 is accumulated in the pipe 3 to be cleaned, the diluted cleaning liquid is pressed into the water in the pipe 3 from the ejector 13 together with the pressurized air. The diluted cleaning liquid and compressed air that are press-fitted are discharged into water in a state where the surfaces of the bubbles of compressed air that have been mixed in the ejector 13 and become fine particles are covered with the diluted cleaning liquid, and are ejected at high speed. As it jets and flows, it can be moved to a far position in the pipe. Then, the water in the pipeline that stagnates during the flow is agitated to generate a water flow in the pipeline.

From the above, the water in the pipe is stirred to generate the frictional force between the inner wall of the pipe and the water flow, and the diluted cleaning liquid diffused in the water adheres to the inner wall of the pipe. Make foreign substances such as water stains and rust free to perform the cleaning operation. It should be noted that while the gas-liquid fine particles ejected into the water by the ejector 13 flow, the fine bubbles gradually release their pressure and expand, and eventually burst to disturb the movement of water and enhance the stirring effect. To help.

The cleaning operation time is related to the amount of cleaning liquid such as the length of the conduit 3 to be cleaned. Usually, after performing the injection operation for 20 to 30 minutes, the faucet is opened at the end of the conduit to contaminate the water. After checking the degree, open the faucet fully and quickly discharge the accumulated wastewater in the pipeline. The pressure-released air contained in the cleaning drainage is discharged outside the pipeline together with the drainage. At the time of this discharge, if the pressure-released air exists as an air reservoir,
When the air reservoir portion is released all at once, the cleaning waste is simultaneously extruded, and the obstacles that prevent drainage can be eliminated. Then, after draining the washed wastewater, it is sent into the pipe line where clean water is washed and washed with water, and the loosened dirt is washed away to be clean, and then the branch pipe line 11 is closed and the cleaning pipe 12 is removed. To do.

After the washed wastewater is discharged, when the washing with fresh water is performed, a portion of the remaining washing liquid is partially retained by partially injecting compressed air to auxiliaryly disturb the washing fresh water with air. Can be washed out to facilitate discharge.

Further, a see-through tube such as a glass tube is provided with a stop valve interposed at the end of the pipeline to confirm the washing state, and preferably a branch pipe for temporarily taking out a part of the washing waste water is temporarily provided at the end thereof. Then, at the time of washing with water after washing, in addition to confirming the washing effect through the see-through tube, by sampling and knowing the presence or absence of the residual amount of the washing liquid, the results of the washing work can be effectively confirmed and the work can be completed without waste.

Based on the gist of the present invention, the present invention is not limited to the above-mentioned embodiments, and can be applied to cleaning of the installed tank and cleaning of clean water, sewers and the like.

[0023]

As described above, according to the present invention, when the cleaning operation is carried out by feeding the cleaning solution diluted to the required concentration into the conduit to be cleaned, the cleaning solution is made into fine bubbles by using the low pressure compressed air. The effect of cleaning in the pipe can be further enhanced by placing it on the surface and causing it to diffuse and flow. Further, since the cleaning liquid used is the neutral detergent as described above, there is no pollution of the environment due to the drainage. Furthermore, although a method is used in which the cleaning liquid is sent into the pipeline using compressed air, the compressed air used has a low pressure, so the cleaning operation can be performed without damaging the piping forming the pipeline with impact. You can
It does not impair economics.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of implementing a method for cleaning a pipeline according to the present invention.

[Explanation of symbols]

 1 Main Pipeline 2 Water Control Valve 3 Pipeline 11 Branch Pipe 12 Cleaning Pipe 13 Ejector 16 Compressor 17 Compressed Air Supply Pipe 18 Cleaning Liquid Supply Pipe 21 Cleaning Liquid Tank

Claims (2)

[Claims] 1. A plant-based cleaning liquid in which a nonionic surfactant is mixed with a plant-based oil and fat agent is diluted to a required concentration to give 1 Kgf / Cm.
2 Use compressed air with a pressure of less than or equal to 2 to send it into the cleaning target pipe line by the ejector, and feed the diluted cleaning liquid.By expanding the compressed air, the diluted cleaning liquid is given a flow force and a stirring force to clean the inner surface of the pipe. A method for cleaning an inside pipe of an existing pipe, which comprises performing a cleaning operation, opening a stopper at a terminal portion of a pipeline, discharging a washed liquid, and then performing cleaning finishing with clean water. 2. The pipe of the existing pipe according to claim 1, wherein the injection of the primary side compressed air in the ejector is intermittently supplied to intermittently perform the suction injection operation of the secondary side diluted cleaning liquid. Cleaning method.