JPH0233891Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention is based on high-pressure fluid and abrasive (abrasive)
This invention relates to an improvement in an ultra-high pressure fluid injection nozzle device that cuts a workpiece by jetting a fluid while mixing it.

《Prior art and its problems》 The basic structure of the ultra-high pressure fluid injection nozzle device is as follows:
As shown in FIG. 2, the rear part of the nozzle gun 1 is divided into a rear chamber 3 that communicates with the high-pressure fluid supply port 2 and a mixing chamber 5 that communicates with the tip side nozzle part 4.
A large number of orifice-shaped jet ports 6 that open toward the nozzle part 4 are formed in the partition between the two, and an abrasive transport pipe 7 is fixed at the center of the rear chamber 3, and its tip is connected to the center of the nozzle part 4. It has a structure that protrudes into the mixing chamber 5 in a state that matches the .

The high-pressure fluid supplied into the rear chamber 3 through the high-pressure fluid supply port 2 converts its pressure into velocity by the orifice effect of the jet port 6, and is jetted out as a jet stream. This jet flow is transmitted to the nozzle section 4.
The jets gather at the center of the nozzle section 4, cancel out the force in the direction perpendicular to the center line, travel parallel to the center line, and jet out from the tip of the nozzle section 4.

Since the jet stream ejected from the jet port advances at a high speed, a negative pressure is generated in the mixing chamber 5, and the abrasive in the abrasive transport pipe 7 is sucked by this negative pressure and comes into contact with the jet stream in the mixing chamber 5. , the nozzle part 4 is mixed and mixed.
It squirts at the tip of the. Abrasive cutting is performed by colliding this jet stream with the surface of the workpiece.

The performance of this nozzle device is such that the greater the velocity energy of the abrasive fluid ejected from the nozzle gun, the higher the cutting performance. However, the problem here is that when the jet flow accelerates the abrasive in the mixing chamber 5, the speed difference between the two is too large, so the velocity energy of the jet flow is due to the acceleration of the abrasive. This causes the blade to wear out and lose some of the speed energy necessary for cutting, resulting in a decrease in cutting ability.

This idea is a nozzle device that prevents a drop in the velocity energy of the jet flow and obtains a large cutting capacity by accelerating the abrasive transferred through the transport pipe before mixing it with the jet flow. intended to provide.

<Means for Solving the Problems> In order to achieve the above object, this invention uses a nozzle gun with a nozzle section at its tip, and a mixing chamber formed inside the nozzle gun that opens into a mixing chamber that directs high-pressure fluid toward the nozzle section. A nozzle gun is provided with a plurality of high-pressure fluid jetting ports for jetting fluid, and an abrasive transport pipe protruding from the center of each jetting port. At the rear end, a coil or the like is provided on the outer periphery of the transport pipe, and excitation of the coil generates a moving magnetic field that generates a thrust directed toward the nozzle portion of the abrasive in the transport pipe. .

<<Embodiment of the invention>> Hereinafter, an embodiment of the invention will be described in detail with reference to FIG.

Note that the same reference numerals are given to the same parts as in the prior art, and only the different parts will be explained.

In the figure, a coil 10 inserted through the abrasive transport pipe 7 is arranged at the rear of the nozzle gun.

The abrasive A transported in the abrasive transport pipe 7 may be a single conductor such as aluminum oxide, copper oxide, cast iron grit, etc., or a mixture thereof, or a mixture of these conductors with silica sand, garnet, etc. It is.

The coil 10 corresponds to, for example, the primary winding of a cylindrical linear motor, and combines the moving magnetic field generated by alternating current (or inverter drive) applied to the coil 10 and the abrasive in the transport pipe 7, which corresponds to the secondary side. The interaction produces an induced current in the abrasive, and this interaction causes the abrasive A to generate a thrust force directed toward the nozzle portion 4 side.

This thrust force can be varied by changing the frequency of the inverter applied to the coil 10.

<<Effects of the invention>> By configuring this invention as described above, the abrasive can be supplied to the nozzle gun in an accelerated state, so the speed difference between the abrasive and the jet flow can be reduced in the mixing chamber. As a result, the loss ratio of energy consumed by the ejected fluid for abrasive acceleration is reduced, and the destructive force, that is, the cutting force, can be increased accordingly.

Furthermore, with this invention, the thrust force can be variably set by adjusting the frequency applied to the coil, so the mixing amount can be adjusted as desired.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an ultra-high pressure fluid injection nozzle device according to this invention, and FIG. 2 is a sectional view showing the configuration of a nozzle gun of a conventional nozzle device. DESCRIPTION OF SYMBOLS 1... Nozzle gun, 4... Nozzle part, 5... Mixing chamber, 6... Spout nozzle, 7... Abrasive transport pipe, 10... Coil, A... Abrasive.

Claims (1)

[Scope of utility model registration request] A nozzle gun with a nozzle section at the tip, a plurality of high-pressure fluid injection ports that open into a mixing chamber formed inside the nozzle gun and jet out high-pressure fluid toward the nozzle section, and a plurality of high-pressure fluid injection ports that project at the center of each injection port. The abrasive transported into the abrasive transport pipe is made of a material containing a conductive material, and a coil or the like is provided on the outer periphery of the transport pipe at the rear end of the nozzle gun, and the coil is excited. 1. An ultra-high pressure fluid ejection nozzle device characterized in that a moving magnetic field is generated that generates a thrust toward a nozzle portion in an abrasive in a transport pipe.