JPS5861866A - Lining device for inner wall of pipe - Google Patents

Abstract

PURPOSE:To coat uniformly in film thickness with a little loss of paint by mixing compressed air with paint fed from a mixing device in a mixing nozzle, and communicating a discharging port of an accelerating nozzle, which accelerates a mixed fluid fed from the mixing nozzle, and the end of an opening of a pipe to be treated, by an introducing pipe. CONSTITUTION:A constantly feeding device 6 for an essential agent A of epoxy resin and a constantly feeding device 7 for a curing agent B are provided, and the agents A and B fed from said devices 6 and 7 are mixed in a mixing device 2 to form a epoxy resin coating. Next, the coating fed from the device 2 is mixed with a compressed air G fed from a compressor to form a mixed fluid essentially consisting of the paint containing a large amount of air bubbles, and the mixed fluid fed from the nozzle 3 is accelerated by a compressed air fed from the compressor, in an accelerating nozzle 4. Further, a compressed air to be fed to the nozzle 4 is regulated by a regulator 5, and a discharging port of the nozzle 4 and the end of opening of a pipe to be treated are communicated by an introducing pipe (e).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe inner wall lining device for existing pipelines, in which epoxy resin paint mixed with a large amount of air bubbles is spouted from one end of the pipe to be treated at increased speed with compressed air. The present invention relates to a pipe inner wall lining device which forms a paint film by pushing and flowing forward the paint layer adhered to the inner wall surface of the pipe using the compressed air.

Generally, in urban water mains, water pipes for housing complexes, industrial water pipes, etc., scale adheres and accumulates on the inner walls of the pipes over time, causing various problems such as cloudy water and increased pipe resistance. arise. To this end, measures have been taken in recent years to periodically clean the inside of the pipe to remove scale, and to apply anti-rust treatment to the cleaned pipe walls by painting or the like.

However, this previous painting equipment for pipelines was simply an application of the usual method of painting the outer surface of an object to pipelines, and involved connecting a long hose to a paint sprayer and passing it into the pipe. The inner surface of the pipe is painted while slowly pulling it out. Although this type of coating device has the advantage that commercially available coating tools can be used as is, it has the disadvantage that if the pipe line is long, the hose will also be long, making the work complicated. Furthermore, since the spray is passed through the pipe, it cannot be applied to small-diameter pipes of 3B or less or pipes with many bends, and in addition, the hose must be moved slowly, resulting in a long working time.

On the other hand, by dispersing relatively low viscosity paint in the air in the form of fine particles and flowing this mixed gas into the pipe 4 at high speed, the fine paint particles adhere to the entire inner wall surface of the pipe to form a lining film. A device with a 1° angle has been developed.

[7] However, in these devices, a paint injection port and a conveyance air injection port are separately provided at the inlet end of the pipe to be treated, and the inlet end of the pipe to be treated is filled with the conveyance air. 17 has a configuration in which paint particles are dispersed in the paint.

As a result, when performing lining work, separate paint supply pipes and transport air supply pipes are required, and if the compressor or paint pressure pump cannot be installed near the open end of the pipe to be treated, However, the problem is that the work is extremely complicated.

In addition, when the paint supply pipe becomes long, it is necessary to reduce the viscosity of the paint to prevent clogging in the pipe, which may cause dripping of the lining film or uneven film thickness due to insufficient paint viscosity, as described below. However, there are disadvantages such as the need for a large-capacity paint pump.

Furthermore, this device suspends paint particles in the air and circulates the concentrated gas mixture into the pipe, so turbulence in the flow of the gas mixture at the elbow of the pipe causes damage to the upper wall of the elbow. The thickness of the lining film on the lower side wall surface (or the left side wall surface and the right side wall surface) tends to be uneven, and in the case of a pipe with many bends, it is not possible to form a film with a uniform thickness over the entire inner surface of the pipe. Since an extremely large amount of paint particles are emitted along with the air from the end of the paint, there is a problem in that the amount of paint used increases significantly.

The present invention aims to solve the above-mentioned problems in the lining treatment equipment for existing pipes, and allows the flow of air and paint by simply installing one introduction pipe between the lining equipment and the pipe to be treated. Moreover, even if the distance between the lining device and the pipe to be treated is quite large, the paint can be transferred without clogging, and by flowing the paint layer adhered to the inner wall of the pipe, the amount of paint can be reduced. It is an object of the present invention to provide a pipe inner wall lining device capable of lining a uniform film thickness with less paint loss.

The present invention includes a quantitative supply device 6 for a main ingredient A of an epoxy resin;
A quantitative supply device 7 for curing agent B of epoxy resin; A mixing device 2 for mixing the main agent A and curing agent B from each of the quantitative supply devices 6 and 7 to form an epoxy resin paint; a mixing nozzle 3 that mixes compressed air G from a compressor with epoxy resin paint 7 to form a mixed fluid mainly composed of paint containing a large amount of air bubbles;
an acceleration nozzle 4 that accelerates the mixed fluid from the mixing nozzle 3 with compressed air from the compressor; a regulator 5 that adjusts the compressed air added to the acceleration nozzle 4; a discharge port of the acceleration nozzle 4 and a pipe to be treated. This system basically consists of an inlet pipe C that communicates between the open ends of the pipe 1 to be treated, and the paint layer deposited on the inner wall surface of the pipe near the open end by being discharged from the open end of the pipe 1 to be treated is transferred to the accelerating nozzle 4. It is characterized by sequentially forming a paint film on the inner wall surface of the pipe by pushing it forward with the added compressed air.

EMBODIMENT OF THE INVENTION Hereinafter, the details will be explained based on one embodiment of the present invention shown in the drawings.

In FIG. 2, A and B are a main ingredient and a curing agent of a two-component mixed epoxy resin paint, which are stored separately in storage containers (not shown). Further, G is compressed air, which is supplied from a compressed air source (not shown) such as a compressor.

The quantitative supply device 6.7 is composed of a pressure pump for the epoxy resin liquid (base resin or curing agent), a flow rate regulator, etc., and the liquids A and B that form the epoxy resin paint are supplied to the quantitative supply device 6.7. 7, the water is sent separately to the inlet side of the mixing device 2 at a constant rate via valves 13 and 14.

The mixing device fj12 is used to form an epoxy resin paint by mixing liquids A and B, which are pumped at a constant rate from the quantitative supply device 6.7, and the mixing method may be any method. Good too. In this example, a method is adopted in which curing agent B is injected into the flow of main agent A and mixed by combining the two at a certain angle, so that liquid A and liquid B are kept constant. The two components are sufficiently mixed at a mixing ratio of 2 to form a so-called two-component epoxy resin paint.

The outlet side of the mixing device 2 is connected to the inlet side of one side of the mixing nozzle 3 via a pipe line 3, and the epoxy resin paint is passed from the mixing device 2 through the pipe line 3 by the pumping force of the quantitative supply devices 6 and 7. or is forced into the mixing nozzle 3.

On the other hand, compressed air G from a compressor or the like is divided into two systems, one system is connected to the air supply port of the mixing nozzle 3 through a pipe line with a valve 12 interposed therebetween, and the other system is connected to the air supply port of the mixing nozzle 3 through a pipe line provided with a valve 11. The regulators are connected to the air supply port side of the acceleration nozzle 4 through air pipes C each having a 5° valve 16 interposed therebetween.・Mixing nozzle 3 is shown in the drawing,
As shown in FIG. 2, the air flow from the pipe line and the paint from the mixing device 2 are configured to merge at an included angle of about 60 degrees, and the paint and air are mixed in the mixing nozzle 3. Mixing takes place. That is, by mixing the paint and air, a mixed fluid (paint and air) mainly consisting of the paint containing a large amount of air bubbles is formed.

The outlet side of the mixing nozzle 3 is connected to the mixed fluid inlet of the accelerating nozzle 4 via a mist pipe d, and the mixed fluid is fed under pressure to the accelerating nozzle 4 through the pipe d.

The accelerating nozzle 4 has the function of applying compressed air to the mixed fluid from the mixing nozzle 3 and thereby increasing the speed of the mixed fluid. Air is sent in from the rear air supply port, and the compressed air accelerates the mixed fluid, which is mainly composed of paint containing a large amount of air bubbles, that is forced into the mixed fluid inlet, creating a high-speed gas/liquid two-phase flow. Blows out forward.

The outlet side of the acceleration nozzle 4 and the inlet side of the pipe to be treated 1 are connected by an introduction pipe e, and compressed air G is passed through the introduction pipe e.
The mixed fluid (paint containing air bubbles) that has been sped up and flows in a gas/liquid two-phase flow is jetted inward from the inlet end of the pipe 1 to be treated through the blow valve 20. 0 It goes without saying that the acceleration nozzle 4 may be directly attached to the inlet end of the pipe 1 to be treated.

Examples of the pipes 1 to be treated include water mains buried underground, domestic water pipes in housing complexes, wood pipes of heat exchangers, and the like. For example, if the pipe l to be treated is a water pipe in a housing complex, remove the appropriate joint near the elevated tank on the roof, remove the water faucet, open both ends, and place the tip of the inlet pipe e on the opening side of the former. and a recovery tank 8 is connected to the outlet 10 of the latter open end. When a mixed fluid mainly composed of paint containing a large amount of air bubbles is ejected into the end of the pipe 1 together with compressed air, the mixed fluid The kinetic energy of the diffused compressed air and the scattering effect of the internal bubbles combine to form an extremely fine mist that spreads in all directions and gradually adheres to the inner wall surface near the end of the pipe 1 [
2 to form a layer of paint. Then, the paint layered on the pipe wall is swept along the inner wall surface of the pipe toward the outlet by the air flow sent from the accelerating nozzle 4, and the paint is sequentially transferred from the pipe inlet to the outlet. A layered lining film is formed.

Once the inner wall surface of the pipe is covered with a paint film, the paint layer that has been swept over it from behind flows extremely smoothly (17) and is successively drawn forward. Although some paint particles are mixed in the air flow M flowing through the pipe, most of the paint is sprayed into the pipe and adheres to the inner wall near the pipe inlet end, resulting in 1. The amount is extremely small.

Continuing to spray the mixed fluid from the accelerating nozzle 4, a small amount of paint flows out from the end of the pipe 1 to be treated.1. Immediately, the pressure feeding of the mixed fluid from the mixing nozzle 3 is stopped, and only the air flow is ejected from the accelerating nozzle 4 for a sustained period. Due to the air flow, the paint layered on the inlet end side of the pipe to be treated 1 is continuously flowed forward, and the thickness of the paint film on the inner wall surface of the pipe is evened out and the paint film is dried. In addition, very small amounts of paint particles contained in the exhaust air stream from the pipe 1 to be treated, and when the lining is completed, are removed from the pipe outlet 10.
The more flowing paint layer is separated and collected in the collection tank 8. In the figure, 21 is a current meter, 22 is a flow meter,
23 is a pressure gauge. Also 17, 18.

19 is a valve connecting these to the air pipe C1 introduction pipe e.

Examples of pipe lengths that can be lined using the lining device according to the present invention when the thickness of the lining film is set to 0.2 to 1 ffl are as follows.

Pipe diameter Maximum length 1 B 50 m 2 B IQOm 3 B 150 m 4 B 200 m It has also been found through experiments that the optimal range of the flow rate of compressed air sent into the pipe has the following limitations. That is, the correspondence 1 is as follows.

Pipe diameter Optimal flow rate 1 B 1.5-2.5 (Maki-) 11/4
B 2.3~3.911/2 B 3
．． 4 to 5.62B 6 to 10 3 B 13.5 to 22.5 4B 24 to 40 Therefore, in the present invention, air is first introduced into the epoxy resin paint formed in the mixing device 2 using the mixing nozzle 3. The mixed fluid containing a large number of air bubbles and mainly consisting of the second paint is accelerated by compressed air in an accelerating nozzle 4, and is then introduced into the pipe 1 to be treated through the inlet pipe e in a gas-liquid two-phase flow state. 1. Because of this, the mist pipe d is moved more smoothly than when the paint itself is pumped directly.
Even if the inlet pipe e is long (or even if the paint viscosity is high), there is no risk of clogging, and there is no need for a large paint pressure pump, and the lining device is covered. This is extremely convenient at construction sites where installation near the processing pipe 1 is not possible.

Furthermore, the single inlet pipe e is used to supply a mixed fluid (paint containing a large amount of bubbles) and a compressed air flow for flowing the paint along the wall of the pipe to be treated 1. Compared to the case where air and paint are pumped separately, handling of the equipment, preparation work, and work become significantly easier.

Furthermore, in the present invention, a so-called air/liquid two-phase flow of paint containing a large amount of air bubbles and compressed air is discharged into the pipe 1, so that the discharged paint contains no air contained in itself. The paint is blown away in all directions due to the interaction between the scattering effect of the paint and the kinetic energy of the compressed air when it is sprayed and diffused, and most of the paint adheres to the inner wall near the entrance of the pipe 1 to be treated. As a result, the paint layer in the air flow M flowing through the pipe 1 becomes extremely small, and the paint wastefully discharged from the pipe end causes paint particles to be dispersed in the air. Comparison 1. and decrease significantly.

Furthermore, since the paint layer adhered to the pipe wall is made to flow forward by the compressed air supplied to the accelerating nozzle 4, thereby forming a paint film, it can be applied not only to straight pipe sections but also to curved pipe sections. The entire wall surface can be lined to a uniform thickness.

Furthermore, the present invention can be easily applied to small-diameter pipes, and the time required for lining is extremely short, for example, 10
For pipes to be treated of approximately
The lining can be completed in 2 to 3 minutes, and the film thickness can be controlled very easily by adjusting the paint viscosity and air flow rate.

As mentioned above, the present invention has excellent practical utility.

[Brief explanation of the drawing]

The drawing is a system diagram showing the configuration of the device according to the present invention. 1 is a pipe, 2 is a mixing device, 3 is a mixing nozzle,
4 is an accelerating nozzle, 5 is a regulator, 6 and 7 are quantitative supply devices, 8 is a collection tank, A is a main ingredient of epoxy resin, B
is an epoxy resin curing agent, and G is compressed air.

Claims (1)

[Claims] Quantitative supply device (6) for epoxy resin base resin (A+; quantitative supply device (7) for epoxy resin curing agent; main component (c) from each of the quantitative supply devices (6), , (7)) )
and curing agent αS) 1. A mixing device (2) for forming an epoxy resin paint; Mixing the epoxy resin paint from the mixing device (2) with compressed air β) from a compressor to create a mixed fluid mainly consisting of paint containing a large amount of air bubbles. a mixing nozzle (3) that forms; an acceleration nozzle (4) that accelerates the mixed fluid from the mixing nozzle (3) with compressed air from the compressor; and an acceleration nozzle (4) that adjusts the compressed air added to the acceleration nozzle (4). A pipe inner wall lining device comprising: a regulator (5); and an introduction pipe fel communicating between the discharge port of the acceleration nozzle (4) and the open end of the pipe to be treated (1).