JPH0244872Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial application field This invention uses air to pump paint through the pipeline when painting the inner surfaces of complex pipelines such as water supply pipes connected to buildings and other structures. This control device is used for the rehabilitation work of the pipeline.

Conventional technology To paint the inner surface of a pipeline such as a building where many pipes are branched in a complicated manner, epoxy resin paint is conventionally injected into each small-diameter branch pipe at the end of the pipe, either simultaneously or sequentially. Generally, air is fed to force the paint into the large-diameter common pipe to form a paint film on the inner surface of the pipe. In addition, in this type of painting method, it is sufficient to send a predetermined amount of air from each branch pipe to the common pipe side, so the air control device often consists of a simple on-off valve. Either the valve also serves as an air volume adjustment, or a separate air volume adjustment valve is provided.

Problems However, the present inventor has developed a method of painting pipelines that is completely different from the painting method described above, and the conventional air control means described above cannot be used for this method.

In other words, this painting method focuses on the property of paint flowing along the surface of an object, injects the required amount of paint into an arbitrarily selected starting end pipe in the pipeline, and then injects the required amount of paint into the pipe at a predetermined level. When a flow of air is detected in the first branch pipe of the branch pipe, the air volume on the starting end side is slightly reduced, and the required volume of air is sent into the branch pipe. The paint is fed backwards, and the above operation is repeated for each branch pipe through which the paint flows out,
When paint flows out into the final branch pipe, the air supply from the starting end side is stopped, and air is sent from all branch pipes to the starting end side to drain out the excess paint that remains stuck in the pipeline. This is an attempt to paint the inner surface of the pipeline all at once in one work process.

Therefore, in this painting method, (a) considerable exhaust noise is generated from the outlet of each branch pipe before the paint flows out because the air sent to the pipe at the starting end is divided and blown through. , this needs to be prevented. (b) If you do not immediately send a predetermined amount of air to the branch pipe where the paint has leaked out and send the paint back, there will be problems such as the paint will flow out wastefully and even dry and harden. However, as mentioned above, this problem cannot be solved with conventional control means consisting only of an air on-off valve that supplies air in only one direction.

Configuration This proposed device attempts to solve the above problems.The proposed device branches each air hose connected to each pipe of a complex pipeline with a large number of branch pipes, and one of the air hoses is connected to an air conditioner. It is characterized in that each of the headers communicating with the presser is connected to the header via an air supply valve that also serves as air volume adjustment, and the other header is connected to an appropriate silencing function unit via an exhaust valve.

Furthermore, a pressure gauge for detecting paint outflow can be inserted and connected to the air hose.

Function First, in order to supply air to the starting end pipe into which the required amount of paint has been injected, close all the air supply valves to each branch pipe and open all the exhaust valves. Therefore, when the exhaust valve on the starting end side is closed and the air supply valve is opened, this air supply valve also serves as an air volume adjustment, so a predetermined amount of air is sent to the pipe on the starting end side, causing the paint to flow. . At this time, the air that flows through the branch pipes while transporting the paint flows through each branch pipe, passes through each air hose, passes through the opened exhaust valve, and is recovered to the silencing function section, so that exhaust noise is generated in each branch pipe. This is completely prevented from occurring.

Also, when paint spills into the first branch pipe, close the exhaust valve of this branch pipe and open the air supply valve.
Similarly, the required amount of air is sent to this branch pipe, and the paint is sent back and flows further into the pipe. In this case, in order to facilitate the reverse feeding of the paint, the amount of air blown on the starting end side is slightly reduced. This is done in the same way when paint flows out into the second and subsequent branch pipes, and during the above action, the air exhausted from the branch pipes from which paint does not flow out is collected by the noise reduction function section as described above. ing.

Once the paint has flowed out into the last branch pipe, open the exhaust valve on the starting end side and close the air supply valve to send air from all branch pipes to the pipe on the starting end side to drain out the excess paint. be.

Embodiment FIG. 1 schematically shows the proposed device, in which each air hose 1, 1a, 1b, . , 4b, .
The air hose 1 is connected to the large-diameter common pipe A, and the branch pipes B, C, etc. are connected to each other through exhaust valves 6, 6a, 6b, .
... are connected to air hoses 1a, 1b, . . . respectively.

Therefore, after injecting paint into the common pipe A selected as the pipe on the starting end side, if air is to be supplied to the pipe, the air supply valves 4a, 4b, . . . of each branch pipe are closed, and the exhaust valve is closed. 6a, 6b, ..., close the exhaust valve 6 of the common pipe A, and open the air supply valve 4, the required amount of air is sent to the common pipe A, the paint is transferred, and it is discharged to each branch pipe. The air is collected from each air hose to the silencing function section 5 via exhaust valves 6a, 6b, . . . .

Moreover, when the paint flows out to the discharge port of the first branch pipe B, the exhaust pipe 6a of this branch pipe B is closed, and the air supply valve 4a is closed.
When opened, the required amount of air is sent to branch pipe B,
The paint is sent backwards and forward. At this time, the air supply valve of the common pipe A is slightly closed to reduce the air flow rate.

After that, repeat this for each branch pipe, and when the paint flows out to the last branch pipe N, after the same operation as above, close the air supply valve 4 of the common pipe A and open the exhaust valve 6. Air is sent from all branch pipes to the common pipe side, and excess paint in the pipeline flows out.

In addition, as an embodiment of the present invention, each air hose 1,
A pressure gauge 7 can be inserted and connected to 1a, 1b, . In this case, since the pressure resistance differs depending on the constituent materials of the branch pipe and the air hose, the moment the paint flows out from the outlet of the branch pipe, the air supply valve is opened to gauge the pressure of the air hose that is supplying air. Since the pointer swings, there is an advantage that air can be immediately switched to the branch pipe.

Although this example shows the case where each air supply valve and each exhaust valve are provided separately, the flow path to each air hose is always open and can be switched from three directions to the air supply side and the exhaust side. Even if a valve is used, similar effects can be achieved.

Effects As mentioned above, according to the proposed device, (a) air hoses are connected to a large number of branch pipes, and the air discharged from the branch pipes before painting is collected and returned to the silencing function section, so each branch Exhaust noise from the pipe outlet can be completely prevented. (b) For branch pipes where paint has leaked,
Since the exhaust gas can be immediately switched to supply air and the required amount of air can be sent, wasteful spillage of paint is prevented, and complex pipelines installed in buildings, etc. can be painted all at once in one work process. It has the following effects.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of an embodiment of the present device, and FIG. 2 is an explanatory diagram of the operation during painting. 1, 1a, 1b, ... air hose, 2 ... air compressor, 3 ... header, 4, 4a, 4
b, ... Air supply valve, 5 ... Silence function section, 6, 6a,
6b...exhaust valve, 7...pressure gauge.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Branching of each air hose 1, 1a, 1b, etc. connected to each pipe A, B, C, etc. of a pipeline in which a large number of branch pipes are arranged in a complicated manner. one of which is connected to the header 3 which communicates with the air compressor 2.
Air supply valves 4, 4a, 4, which also serve as air volume adjustment, respectively.
b, . . . and the other is connected to an appropriate silencing function unit 5 through exhaust valves 6, 6a, 6b, . . ., respectively. Device. (2) The air control device for painting the inner surface of a pipe of complex piping according to claim 1, wherein a pressure gauge 7 for detecting paint outflow is inserted and connected to each of the air hoses.