RU2296292C1 - Device for cleaning of inner surfaces of pipe-lines and tanks of composite configuration, mainly of ammunition - Google Patents

Abstract

FIELD: various branches of industry, in particular, tools used for destruction of materials of various types by high-speed fluid cavitation jets, and may be applicable for removal of these materials from the inner spaces of tanks of a composite configuration, mainly for unloading of ammunition (warheads, projectiles, missiles) or for cleaning of pipe-lines from undesirable deposits.

SUBSTANCE: the device has a means for feeding of high-pressure fluid with a control system connected with the aid of a pipe-line to the inner space of the multinozzle generator unit of fluid cavitation jets, the axes of the generators of the multinozzle unit are positioned tangentially to the helical lines whose diameter equals d_h.l=d_m.u.-[d_g+(1-4mm)], where d_h.l-the diameter of the helical line, d_m.u.-the diameter of the multinozzle unit, d_g-the diameter of the generator of fluid cavitation jets.

EFFECT: provided compact placement on the minimum probable overall dimension of the unit of a great number of the most effectively operating generators of fluid cavitation jets with possibility of their periodic replacement.

4 dwg

Description

The invention relates to various industries, namely, tools used to destroy various types of materials with high-speed liquid cavitating jets, and can be used to remove these materials from the internal volumes of tanks of complex configuration, mainly for the unloading of ammunition (warheads, shells, missiles) or cleaning pipelines from unwanted deposits.

The closest analogue to the proposed invention is a device for cleaning the internal surfaces using the effect of cavitation fluid, described in patent RU 2113290, publ. 1998. This device consists of a high-pressure fluid supply system with control equipment and a multi-nozzle fluid cavitation generator, which has several lateral openings made in the form of threshold elements consisting of an inlet part ending in a step extending to the outlet.

The disadvantage of this technical solution is that, as our studies have shown, the efficiency of a generator having such openings is very low. Generators of cavitating jets are more effective for the destruction of materials, in which the effect of cavitation due to the high degree of rarefaction in the cavity between the cylindrical leveling field of fluid velocities, the generator part and the diffuser inlet manifests itself most intensively. But it is very difficult to construct such generators from one part constructively with a high degree of accuracy, it is especially difficult as part of a multi-nozzle generator.

The technical task of the invention is to increase the efficiency of cleaning internal volumes while reducing the dimensions of the multi-nozzle unit, especially for the demilitarization of hexogen-containing ammunition of various calibers.

The problem is solved in that the device for cleaning the internal surfaces of pipelines and containers of complex configuration, mainly ammunition, by hydrocavitational removal of materials from internal volumes contains a means for supplying high pressure liquid with a control system connected via a pipeline to the internal cavity of the multi-nozzle block of cavitating liquid jets generators , while the axes of the generators of the multi-nozzle block are located tangent to helical lines whose diameter is veins d _c = d _b - [d _g + 1-4 mm], where d _c is the diameter of the helix, d _b is the diameter of the multi-nozzle block, d _g is the diameter of the generator of cavitating jets of liquid.

The axis of the generators can be located tangent to helical lines of different diameters and with the same or different steps.

It is most technologically advanced to make such generators from two or more parts and install them in a multi-nozzle unit. The generators in the block can be installed by pressing, on a threaded connection, by soldering or in some other way. Moreover, the internal surfaces of the generators after prolonged operation can have erosive wear, which will require periodic replacement, and their design should allow this process to be carried out.

The present invention allows compactly, at the smallest possible overall block size, to place a large number of the most efficiently operating generators of cavitating jets of liquid with the possibility of periodic replacement.

The essence of the claimed invention is illustrated using graphic materials.

In Fig. 1, a block 1 of cavitation generators 3 located inside the pipe 2, Fig. 2 shows a helix with a diameter d and pitch h, along the tangent axis of which are the axes aa of the cavitation generators 3, and Fig. 3 (a) shows a block of cavitation generators whose axes are tangent to helical lines of various diameters and steps (front view), in Fig. 3 (b) is a side view of a block of a cavitation generator in Fig. 3 (a), in Fig. 3 (c) - section aa in figure 3 (a), and figure 3 (d) - section bb in figure 3 (a), figure 4 (a) - section bb and figure 4 ( b) (front view) shows a block of cavit generators tions with a diameter d, whose axes are tangent to a helix with a diameter d.

The device operates as follows.

The working fluid, for example water, is pumped by a high pressure pump (15 ÷ 25 MPa) through the pipeline into the internal cavity of the block of cavitation generators 1.

Using the control system, the unit is inserted into the cavity of the tank being cleaned or inside the pipeline 2 and moves progressively. The tank or pipe being cleaned is rotated. Thus, the cavitation generators 3 during operation move relative to the work surface on helical lines.

Due to the fact that the working fluid together with the material to be destroyed is removed from the zone of impact on the material through the gap between the housing of the generator block and the inner wall of the processed pipe or tank, in the presence of large pieces of material the gap can become clogged, which will lead to an emergency stop of the installation. Reducing the size of fragments of destructible material can be achieved by increasing the number of generators in the block and more uniform destruction of the material.

The most compact to the least possible Overall dimensions of the multi-block cavitating jets generators, can accommodate a large number of generators and to transmit cavitating fluid jet in a specific place on the treated surface if generators axis positioned tangentially to the helical lines having a diameter d _at less than the outer diameter of the nozzle block d _b the size of the outer diameter of the generator cavitation fluid d _g plus 1 ÷ 4 mm from the conditions of structural strength (d _b - [d _g + 1-4 mm]). The pitch of the helix h, along the tangent to which the axis of the generator is located, is selected so that the distance from the outlet of the generator to the work surface is optimal from the point of view of the most efficient operation of the generator. Depending on the tasks solved with the help of such a nozzle block (the pipeline or container is filled with completely removable material or only their inner walls), each generator on one nozzle block can be located differently, i.e. their axes can be located tangent to helical lines of one step or to helical lines of various diameters and steps. Due to this, it is possible to achieve uniform removal of material in hard-to-reach areas of pipelines or containers being cleaned, especially during the demilitarization of hexogen-containing ammunition of various calibers.

Claims (3)

1. A device for cleaning the inner surfaces of pipelines and containers by hydrocavitational removal of materials from internal volumes, comprising means for supplying high pressure liquid with a control system, connected via a pipe to the internal cavity of the multi-nozzle block of cavitating liquid jet generators, characterized in that the axis of the generators of the multi-nozzle block arranged tangentially to the helical lines, the diameter of which is equal _to d _b = d - [d 1 _d ... 4 mm], where d _a - helix diameter, d _b - m diameter ogosoplovogo unit, d _d - diameter of the generator cavitating liquid jets. 2. The device according to claim 1, characterized in that the axis of the generators are tangent to the helical lines of various diameters with the same or different steps. 3. The device according to claim 1, characterized in that it is used for cleaning ammunition.

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