JPS6110773Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the nozzle of an ultra-high-pressure jet pump that injects high-pressure water from a spray gun.The purpose of this invention is to improve the effectiveness of cleaning, such as removing scale from a heat exchanger, by using only a stream of water, which is equivalent to using a sand jet. That is.

Generally, this type of scale removal operation using only high-pressure water stream requires extremely high injection pressure (for example, 300 Kg/cm ² to 400 Kg/cm ² ). Therefore, the spray gun had a defect in that the recoil force was large (desirably 25 kg/cm ² or less).

Therefore, the sand jet injector method is used for removing sand from castings, removing rust from ship hulls, etc., where scratches may occur on the surface of the metal being polished.
However, in this construction method, at least a sand jet device, an air compressor, and a jet cleaner pump must be connected to the cregan, resulting in a complicated configuration, which not only makes handling difficult, but also increases costs. It has some defects.

This invention was made in view of the above circumstances,
The configuration will be described below with reference to the drawings of the embodiments.

1 has three small holes 2 for high-pressure water running in the longitudinal direction at regular intervals on the peripheral edge 1a of one side,
This is a nozzle body that has a protruding shaft part 4 with an air hole 3 drilled in the center of one end on the axis, and the base end of this air hole 3 communicates with the end of an orthogonal guide hole 5 bored in the middle part of the nozzle body 1. The base end of the small water flow hole 2 is connected to the inflow chamber 6 of the spray gun attachment port 6 provided at the base end of the nozzle body 1.
It is connected to a. 7 has a spout 8 in the center,
This is a jet cap having an inner tapered part 9 with a smaller diameter on the jet port 8 side, and a screw 10 provided at the end of the jet cap 7 on the inner taper part 9 side is screwed into a screw 10' provided on the outer periphery of the tip of the nozzle body 1. The protruding shaft part 4 is made to face the center of the spout 8 part of the jet cap 7 through a gap a, and a tapered gap b is formed between the protruding shaft part 4 and the inner tapered part 9. It is configured as a nozzle 11. In this case, the tip of the small high-pressure water flow hole 2 faces the tapered gap b.

To explain this effect now, first of all, this nozzle 1
1, the attachment port 6 of the nozzle 11 is attached to the tip of a jet gun 12 that connects to a jet cleaner pump (not shown), and an air compressor (not shown) is attached to the guide hole 5 of the nozzle 11. This is to connect the high pressure air hose 13 that communicates with.

At this point, point the tip of the nozzle 11 toward the scale surface A, which is the surface to be cleaned, and then
If high pressure water is allowed to flow into the nozzle 11 from the
This high-pressure water flows through the three small water holes 2 in the nozzle 11.
Since the water flows through the taper-shaped gap b, it is further pressurized by the convergence of the tapered gap b and reaches the jet nozzle 8. In this case, the three small water holes 2 are connected to the nozzle body. 1, the high-pressure water turns into a vortex in the tapered gap b and is evenly sprayed over the entire gap a, which is the opening of the spout 8. Moreover, at this time, when high-pressure water is injected, the high-pressure air protruding shaft part 4 is arranged in the center of the mound opening 8 and blows out high-pressure air, so that the scale A is destroyed, peeled off, floated, and atomized. will be removed.

That is, (1)...The two-phase flow of water and air caused by mixing water and air is essentially a microscopically unstable flow, so the flow near the wall is active with rotation and stirring effects, and for this reason This causes peeling and atomization (see Figure 5).

Also, (2)...the impact effect of high-pressure water flow is large;
If a thick layer of water exists near the wall surface (if there is a dead water layer d near the wall surface), the impact effect of the high-pressure water flow will be weakened. However, if there is high-pressure air here, the high-pressure air flow will create a space near the wall that is not filled with water.
This increases the impact pressure of the high-pressure water flow against the wall surface, causing destruction of the scale layer, atomization, and cracking of the scale layer (see Figure 6 A and B).

Moreover, (3)...Air flow mixes into the scale layer near the wall surface and its cracks, and the high-pressure water flow has the effect of enveloping it (trap effect). This produces a movement effect on the scale layer, causing it to peel off and float (see Figure 7 A and B).

These reasons (1), (2), and (3) above together make it possible to remove various types of scale.

Depending on the condition of the scale, a high pressure air hose 1 may be connected to the guide hole 5 of the nozzle body 1 as shown in the figure.
3 is not connected and the guide hole 5 is simply left open, if high-pressure water is injected from the jet nozzle 8 of the jet cap 7, the air hole of the protruding shaft rod part 4 located at the center of the jet nozzle 8 will be injected. Since a negative pressure phenomenon occurs at the three opening edges, air is attracted from the air hole 3 and mixed into the high-pressure water jet.

As described above, in the nozzle of the present invention, the air outflow hole is arranged in the center of the high-pressure water jetting hole, so that air is mixed into the high-pressure water to be jetted. Therefore, even if there is a dead water layer in front of the scale layer, it can be removed by mixing with airflow, maximizing the trapping effect of high-pressure water, destroying, peeling off, floating, and atomizing the scale.
Reliable scale removal becomes possible. Moreover, since the structure of the present invention is extremely simplified, it can withstand long-term use without causing problems such as clogging or damage.
Moreover, it has practical effects such as being able to be attached to a ready-made spray gun.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical sectional side view of the main part, FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 6A and 7B and 7A and 7B are explanatory diagrams showing the operating state. 1... Nozzle body, 1a... One side peripheral part, 2...
...Small water flow hole for high pressure water, 3...Air hole, 4...Protruding shaft part, 5...Guide hole, 7...Ejection cap, 8
... spout.

Claims (1)

[Scope of utility model registration request] A nozzle body is formed in which a plurality of small water holes for high-pressure water are bored in the peripheral edge of one side, and a protruding shaft part with an air hole is arranged in the center at one end, and the nozzle body becomes the side of the protruding shaft part. A spout cap with an inner taper is attached to the tip, and the protruding shaft part is faced coaxially with the spout of the spout cap, making it double, and the above-mentioned flowing water is provided between the protruding shaft part and the inner taper. A spray gun nozzle consisting of a tapered gap facing the hole.