JPH025887Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a jet nozzle having a plurality of nozzles.

Nozzles that utilize the ejector action of high-pressure carrier fluid are often used to spray liquids or powder onto a predetermined surface, but in order to ensure a wide spraying surface, multiple nozzles are installed in parallel. is effective.

For example, the water chamber wall of a steam generator in a pressurized water nuclear power plant may come into contact with coolant containing trace amounts of radioactive materials and become contaminated with radioactivity.

Therefore, it sometimes becomes necessary to decontaminate the walls of the water chamber, and a proposed method for this purpose involves spraying particles such as boron oxide and utilizing the collision energy of the particles.

This method scans the surface to be decontaminated with a jet nozzle aimed at the surface to be decontaminated, and if the spraying surface in one pass is large, the work can be completed efficiently in a short time, so multiple jets are It is preferable to arrange the nozzles in parallel.

However, the particles tended to flow non-uniformly within the piping and could not be distributed equally to multiple nozzles.

The present invention was developed in view of such circumstances.

The present invention will be explained below based on the illustrated embodiments.

A main body 1 attached to the end of an arm of a manipulator (not shown) has a supply hole 3 for boron oxide particles.
is connected to the particle supply device via a flexible hose (not shown).

Two nozzle seats 5 are formed in communication with the supply hole 3, and an ejector nozzle 7 is inserted into the seats 5.

A high-pressure water hole 9 that communicates with a pressurizing device (not shown) through a high-pressure hose (not shown) communicates with an annular space 11 outside the ejector nozzle 7. It is ejected through 13.

A jet nozzle 17 is fixed inside an adapter 15 screwed onto the tip of the nozzle seat 5.

As described above, due to the ejector effect of the high-pressure water flowing into the conical flow path 19 of the nozzle 17, boron particles are sucked from the supply hole 3, exit into the nozzle 17, mix with the high-pressure water, and flow through the nozzle 17. It is ejected from.

A flow rate regulating partition plate 20 is provided in the supply hole 3, a perspective view of which is shown in FIG.
The partition plate 20 includes a horizontal partition plate 21 and a vertical partition plate 23.
The horizontal partition plate 21 has a bent portion 25 on the inflow side.
, and the inflow end 27 is located below the center of the supply hole 3.

The boron oxide particles divided by the above adjustment partition plate 20 are ejected from the two nozzles 17 in substantially the same amount, so that a wide spray surface is obtained.

In addition, in the above embodiment, two nozzles 1
Although this is an example in which the particle flow is divided into seven nozzles, the idea of the present invention can also be applied to three or more nozzles.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the present invention;
The figure is a perspective view showing a part of the embodiment. 1... Main body, 3... Supply hole, 7... Ejector nozzle, 17... Nozzle.

Claims (1)

[Scope of utility model registration request] In a device in which at least two powder and granular material ejection nozzles are arranged in parallel in communication with a powder and granular material inflow hole of the main body, an ejector portion formed in the nozzle is communicated with a high pressure fluid supply hole, and the inflow hole is connected to a high pressure fluid supply hole. A powder or granular material ejecting nozzle, characterized in that a powder or granular material flow rate adjusting partition plate is provided in the granular material ejecting nozzle.