JPH049015Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nozzle device for painting the inner wall of a pipe, which is used for painting the inner wall of a pipe body for purposes such as rust prevention.

[Conventional technology]

Various apparatuses have been proposed for painting the inner wall surface of a pipe body.

An example of this is a nozzle body that spouts a mixed fluid of paint and compressed air, a horn body connected to the tip of the nozzle body, and a guide body placed in front of the horn body with a slight gap. It is. In this case, the mixed fluid ejected from the nozzle body is
It moves while being guided through the gap between the horn body and the guide body,
It ejects in an inverted cone shape. With this, the paint is brought into pressure contact with the inner wall of the pipe to be painted and is stretched forward to perform painting.

[Problem that the invention attempts to solve]

Although the above-mentioned apparatus is an excellent apparatus, it is not easy to control the thickness of the coating film formed on the inner wall of the pipe to be coated. The present invention aims to solve this problem and to provide an apparatus that can achieve even higher effects in increasing the coating speed and making the thickness of the coating film more uniform. Another objective is to make the device more compact and simple.

[Means for solving problems]

The gist of the configuration of the present invention is that a small-diameter pipe body is sheathed with a large-diameter pipe body, and the space formed between the small-diameter pipe body and the large-diameter pipe body is used as a passage for a mixed fluid of paint and compressed air. and the tip of the passage is configured as a spout for the mixed fluid, while the small diameter pipe body is used as a passage for compressed air,
This is a nozzle device for painting the inner wall of a pipe, in which a guide tube is attached to the tip of the passage to form a compressed air nozzle. In addition, an attachment part to the end of the pipe to be painted is provided at the tip of the large diameter pipe body, and this attachment part constitutes a flange at the end of the large diameter pipe body, and this attachment part is connected to the flange of the pipe to be painted. or by slightly extending and enlarging the end of the large-diameter pipe body to form a female thread on it.
This may be screwed into a male thread formed at the end of the tube to be painted. Its configuration is not limited to anything special.

Several types of large-diameter pipe bodies should be prepared in accordance with the diameter of the pipe to be painted, so that the diameter of the large-diameter pipe body is approximately the same as that of the pipe to be painted.

It is convenient that the spout of the mixed fluid is constricted by slightly enlarging the outer periphery of the tip of the small-diameter pipe body. Like the mixed fluid passage, this has an annular shape when viewed from the end face, and ejects a cylindrical mixed fluid.

The large-diameter pipe body has its rear end closed to block the rear part of the mixed fluid passage, and an inlet for the mixed fluid communicating with the passage is provided on the outer periphery near the rear part.
It is appropriate that a plurality of these inlets be arranged at equal angular intervals along the circumferential direction of the large-diameter pipe body.

A compressed air inlet is provided at the rear end of the small diameter pipe body, and a cylindrical guide tube with a closed end is attached to the front end with a fixed plate.

The nozzle device of the present invention described above is used by connecting a mixed fluid of compressed air and paint and a compressed air supply device.

For example, a compressor that generates compressed air, a paint tank equipped with an accelerating injector that mixes and accelerates the compressed air supplied from the compressor and paint, a flow rate regulating valve that adjusts the flow rate, and a This device consists of a flow rate adjustment valve that adjusts the flow rate of compressed air.

The paint tank is connected to the inlet of the mixed fluid passage via the flow rate regulating valve. Further, the compressor is connected to the inlet of the compressed air passage (small diameter pipe body) via the flow rate regulating valve.

In addition, it is necessary to separately prepare a transparent detection tube that is attached to the end of the tube to be coated to detect the completion of coating, and a treatment device for the discharged mixed fluid.

[Effect]

Since the present invention is constructed as described above, it can be used as follows.

First, the nozzle device of the present invention is attached to the end of the pipe to be coated using the attachment part. Depending on the configuration, the flanges are joined and screwed together, or the female thread of the attachment part is screwed into the male thread of the end of the pipe to be painted.

On the other hand, a detection tube is attached to the end of the pipe to be painted, and the exhaust mixed fluid processing device is further connected to the end.

Further, the nozzle device is connected to a mixed fluid of the compressed air and paint and a compressed air supply device.

After that, when the compressor is driven and each flow rate adjustment valve is adjusted, compressed air is supplied to the paint tank, and a mixed fluid of paint and compressed air is generated by the accelerating injector in the paint tank, and the mixed fluid is sent to the nozzle device. is injected into the passageway. On the other hand, compressed air from the compressor is supplied to a compressed air passage (small diameter pipe body) in the center.

The mixed fluid thus supplied to the passage between the large-diameter pipe body and the small-diameter pipe body is ejected from the nozzle formed at the tip thereof.

Since the nozzle has an annular shape when viewed from the end surface, the mixed fluid is ejected from the nozzle in a cylindrical shape. Since the large-diameter pipe body has the same diameter as the pipe to be painted, the mixed fluid is ejected along the inner wall of the pipe to be painted.

Therefore, the mixed fluid comes into contact with the inner wall of the tube to be coated, and the paint particles adhere to the inner wall and are swept toward the end of the tube.

On the other hand, compressed air is ejected from the nozzle at the tip of the small-diameter pipe body, travels along the guide tube, and causes paint particles adhering to the inner wall to travel further toward the end.

The compressed air blown out from the nozzle at the tip of the central small-diameter pipe body serves to increase the coating speed on the inner wall of the tube to be coated, and also helps to form a thin and uniform coating film. Further, by adjusting the flow rate regulating valve, the thickness of the coating film can be adjusted.

In addition, the formation of a paint film gradually progresses on the inner wall of the pipe to be painted, and when it finally reaches the detection tube, the inner wall of the detection tube is coated, so it is possible to visually confirm the completion of the coating. can.

After completion, remove the device from the pipe to be coated by reversing the procedure described above.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

As shown in FIG. 1, a large-diameter pipe body 2 is mounted on a small-diameter pipe body 1, and a female mounting thread 4 is formed at the tip of the large-diameter pipe body 2 to be screwed into the end of the pipe to be painted 3. . The inner diameter of the large-diameter pipe body 2 is approximately the same as that of the target pipe 3 to be painted.

There is a space with an annular cross section between the small diameter pipe body 1 and the large diameter pipe body 2, and this space with an annular cross section is used as a passage 5 for a mixed fluid 20 of paint and compressed air. In order to introduce the mixed fluid 20, four inlets 6, 6, . . . are formed at angular intervals of 90 degrees along the circumferential direction near the rear end of the large diameter pipe 2. Further, the rear end of the passage 5 is closed, and the tip is configured as a spout 7 for the mixed fluid 20. The nozzle 7 is formed by slightly enlarging the outer periphery of the tip of the small-diameter pipe body 1 and narrowing the outlet of the passage 5.

On the other hand, a compressed air inlet 8 is formed at the rear end of the small diameter pipe body 1, and a cylindrical guide tube 9 is attached to the tip using a fixing plate 10. The fixing plate 10 consists of four pieces arranged at angular intervals of 90 degrees. Note that the rear end of the guide tube 9 is closed, and the gap between the small diameter pipe body 1 and the guide tube 9 is used as a nozzle 11.

The mixed fluid 20 and compressed air are supplied by the following equipment.

As shown in FIG. 3, this device includes a compressor 12 that generates compressed air, and a dryer 13.
, a paint tank 14 , and a mixed fluid 2 from the paint tank 14
It is composed of a flow rate adjustment valve 15 that adjusts the flow rate of 0, and a flow rate adjustment valve 16 that adjusts the flow rate of compressed air. The paint tank 14 is connected to the compressor 1.
It is equipped with a pressurized injection device that mixes and injects the compressed air generated in step 2 and the paint.

In FIG. 3, numeral 17 indicates the nozzle device described above, numeral 18 is a transparent pipe for detecting completion of coating, and numeral 19 is a processing device for the mixed fluid 20 discharged from the end of the pipe to be painted 3. .

Since this embodiment is constructed as described above, it is used for painting the inner wall of the tube body as follows.

Here, a case will be described in which the inner wall of the pipe 3 to be painted is painted.

First, a nozzle device 17 having a female mounting thread 4 corresponding to the male thread formed at the end of the pipe 3 to be coated is selected. The pipe 3 to be painted is subjected to pretreatment such as scale removal.

Then, the nozzle device 17 is connected to the end of the pipe 3 to be painted by screwing the female mounting thread 4 into the male thread at the end of the pipe 3 to be painted. A detection tube 18 is installed at the end of the tube 3 to be painted.
and a processing device 19 for mixed fluid 20 is connected to the detection tube 18 .

Furthermore, as shown in FIG. 3, the nozzle device 17 is connected to a generator for generating the mixed fluid 20 and compressed air.

That is, first, the paint tank 14 is connected to the flow rate regulating valve 1.
5 to the inlets 6, 6, . . . formed in the large diameter pipe body 2. On the other hand, the compressor 12 is connected to the inlet 8 formed in the small diameter pipe body 1 via the dryer 13 and the flow rate regulating valve 16.

When the device is driven with the above preparations, the compressed air from the compressor 12 is supplied to the paint tank 14, and the compressed air and paint are mixed by the pressurized injection device to generate a mixed fluid 20, with a flow rate of It is injected into the passage 5 via the regulating valve 15. aisle 5
The mixed fluid 20 injected is then injected from the nozzle 7 into the tube 3 to be coated in a cylindrical shape having a diameter approximately equal to the inner diameter of the tube. As shown in FIG. 2, the mixed fluid 20 advances toward the end of the tube while adhering to the inner wall of the tube 3 to be coated. That is, the paint layer that is formed by adhesion is swept away by the mixed fluid 20 that is jetted out next, and sequentially advances toward the end of the tube.

On the other hand, compressed air from the compressor 12 is supplied to the dryer 1.
3 and a flow rate regulating valve 16 into the central small diameter pipe body 1, and a nozzle 11 formed by the gap between the small diameter pipe body 1 and the guide tube 9 inside the pipe to be painted 3.
More erupts. Therefore, as a result, the paint layer on the inner wall of the pipe to be painted 3 is further extended forward, and a thin and uniform paint film is formed by the guide tube 9. By adjusting the flow rate adjustment valve 16,
The thickness of the coating on the inner wall of the tube 3 to be coated can be adjusted. The compressed air not only promotes forward movement of the paint layer but also promotes fixation.

In addition, as described above, the coating film gradually progresses on the inner wall of the tube to be painted 3 and finally reaches the detection tube 18, whereupon the inner wall of the detection tube 18 is coated. The completion of the process can be known with certainty.

After completion, the apparatus is removed from the pipe to be coated 3 and rearranged in the reverse order as described above.

[Effect of idea]

According to the present invention, the coating speed can be improved, the thickness of the coating film can be easily adjusted, and furthermore, this can be accomplished using a simple device.

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a schematic sectional view thereof, FIG. 2 is a partially enlarged sectional view showing the state at the time of painting, and FIG. 3 is a conceptual diagram showing the state of use. 1...Small diameter pipe body, 2...Large diameter pipe body, 3
...Pipe to be painted, 4...Female mounting thread, 5...Passage,
6, 8... Inlet, 7, 11... Nozzle, 9... Guide tube, 10... Fixed plate, 12... Compressor,
13...Dryer, 14...Paint tank, 15, 16
...Flow rate adjustment valve, 17...Nozzle device, 18...
Detection tube, 19...processing device, 20...mixed fluid.

Claims (1)

[Scope of utility model registration request] A large-diameter pipe body is sheathed on a small-diameter pipe body, and the space formed between the small-diameter pipe body and the large-diameter pipe body is used as a passage for a mixed fluid of paint and compressed air, and the tip of the passage is used as a passage for a mixed fluid of paint and compressed air. It is configured as a nozzle, while the small diameter pipe body is used as a passage for compressed air,
A nozzle device for painting an inner wall of a pipe, characterized in that a guide tube is attached to the tip of the passage to constitute a compressed air nozzle.