Electropulse piercing method of pipes in out-of way places

FIELD: metallurgy.

SUBSTANCE: invention relates to pressure materials processing with usage of energy of electric explosion of metallic conductor in liquid transfer medium and relates, particularly deformation and piercing of pipes of wide range of configuration and geometry in out-of-the-way places. Pipe is installed into opening of tube plate, it is located at the end of pipe pre-assembled structure, consisting of exploding element in the form of ring made of foil, located at the butt of strength cylinder made of dielectric, allowing through co-axial opening, in which it is located rod electrode, connected by electric contact to central part of ring made of foil. It is used the second electrode in the form of clenching metallic bushing, located at cylinder from the condition of providing of fixation on its side surface of peripheral part of ring, connected to rod electrode and bearing on centering insulating chain gears of core insert with installed on it director cone and figure of revolution, implemented of strong material. It is implemented location of figure of revolution and director cone of mentioned structure in area of pipe straining filling of pipe cavity by transfer medium, waterproofing of pipe by flexible plug of one butt and washer of the other, implementation of electric explosion of explosion element. Additionally in used pre-assembled structure of ring surface made of foil are implemented with profile by hyperbolic function, of thickness, increasing partly. Core insert is connected to rod electrode by means of filler, reinforced by metallic conductors, allowing at side surface symmetric longitudinal stringers, external diametre of which is equal to inner diametre of pipe.

EFFECT: there are increased method efficiency and coefficient of efficiency.

6 dwg, 1 ex

 

The invention relates to the field of materials processing pressure using the energy of electric explosion of metallic conductor in a liquid transmitting medium and relates, in particular, deformation and pulling the pipes of a wide range of configurations and sizes are in hard to reach places.

There are various mechanical devices and methods of crimp tubes in tube heat exchangers, such as rollers, rolling, mandrels, in particular: No. 2165325, 2001.04.20, IPC B21D 39/06, B21D 53/08, F28F 9/16. The essence of the method of fixing tubes: on the inner surface of the pipe adjacent to its end, form an internal annular thickening, the pipe is installed in the hole of the tube sheet having on the surface an annular groove and is fixed against a possible move, then to the inner surface of the pipe exert the compressive force of the rollers mechanical rolling, providing clamping of pipes. The length of the rollers exceeds the width of the inner annular thickening. The result is a sufficient filling of the volume of the annular groove tube without cutting the pipe walls in the presence of taper rollers mechanical rolling.

The application of the proposed devices and methods require high energy costs, long processing time, they are about the present high intensity and limited technological capabilities, and when using manual methods and devices is problematic to make the injection pipe curved geometry in a remote place.

The known device for pulling the pipe in which the active element used explosives (A.S. 1731359, CL 5 B21D 26/08, 07.05.92 year). The inventive explosive charge has a ring shape, wall thickness which increases from the middle section to the ends, and detonating cord at the site of contact with the charge bent around the ring and is located on the inner surface of the charge. The explosive cartridge comprises a cylindrical housing made of two coaxial cylinders which are supplied with lids.

The application of the proposed devices in many cases is undesirable due to higher requirements for safety during operation. And they don't always allow you to solve a technical problem, such as the implementation of the deformation of the pipe is curved geometry and small diameter, generating a cylindrically symmetric and uniform shock wave pressure in a remote place.

Classic blasting cartridge (Malushevsky P.P. Basics discharge-pulse technology. - Kiev: Naukova Dumka, 1983, - 342 C.) for deformation of the pipe in a remote place is also problematic from the and the impossibility of placing the blasting cartridge in the area of deformation, in particular, when the curved geometry of the pipe.

Closest to the claimed invention is "Electrohydropulse way fitting pipes in hard to reach places" (patent RU №2125496, 6 B21D 26/10, 1999).

This method involves the following steps: installing the pipe in the hole of the tube in the cavity at the end of the post pre-assembled construction, consisting of a highly explosive element in the form of a flat ring of foil that is placed on the end of mechanically rigid cylinder of dielectric material having a through axial hole, in which a rod connected electrical contact with the center of the exploding of a flat ring, as the second electrode using jaws metal sleeve, which is mounted on the cylinder of the conditions for ensuring fixation on the lateral surface of the peripheral part of the flat ring, and rod insertion, based on centering insulating stars and connected with the rod electrode, on which the body of rotation and the guide cone, made of mechanically strong material, and the body of rotation and the guide cone is placed in the zone of deformation of the pipe, fill the cavity transmission environment, hydro-insulation of pipes elastic tube on its end face, and g is droseraceae tube-side electrodes establish an elastic tube in the form of an annular strip and carry out electrical explosion.

The disadvantage of this method is that the electrical explosion of the explosive element in the form of a flat ring of foil will need to apply a high potential difference at its Central and peripheral part. In the case of the proposed geometry of the explosive element in it obviously creates a nonuniform electric field. Therefore, the electric current flowing in the radial direction by a flat ring of foil, and accordingly, the current density in each section of the ring will be different. As a result, the processes of heating, melting, destruction, evaporation, explosion, the emergence of plasma formation, etc. in the electric explosion will be unpredictable, to wear in the volume of the ring of foil local character. Electric explosion of a flat ring of foil will proceed unevenly, in transmitting the condensed environment will be generated is not flat, but a complex profile of the wave front of the shock wave. In a rough approximation of a uniform electric explosion of a flat ring of foil can be provided using well-defined geometrical dimensions of the latter, in particular reducing the width of the ring, i.e. the active zone of the explosive element, but probably used the list size will eno is but narrow, that entails a reduction in technological applications. Otherwise, the process flow of electric explosion is not in the best mode, there is undue loss of energy, the efficiency is low.

The technical result of the invention is the implementation of a uniform electric explosion ring of foil, extending the range of sizes of ring of foil, generating a planar shock-acoustic waves of high intensity, increase efficiency.

The technical result is achieved by the fact that in electrohydropulse method of fitting pipes in hard to reach places, namely, the pipe is installed in the hole of the tube, placing the tube end pre-assembled structures consisting of highly explosive element in the form of a ring of foil located at the end of mechanically rigid cylinder of dielectric material having a through axial opening in which is located a rod electrode connected electrical contact with the Central part of the ring of foil, a second electrode in the form of jaws metal sleeve located on the cylinder of the conditions for ensuring fixation on the lateral surface of the peripheral part of the ring that is connected with rod electrode and based on centeroo is their insulating stars rod inserts mounted with the guide cone and body rotation, made of mechanically strong material, the location of the body of rotation and the guide cone mentioned structure in the deformation area of the pipe, filling the cavity of the pipe transmitting medium, waterproofing pipe flexible tube one end and an annular gasket of another, the electrical explosion exploding, element, used in pre-assembled design one surface of the ring of foil made profile for hyperbolic functionsand the opposite surface is flat, with a thickness increasing from the peripheral to the Central part, the core insert is connected with the rod electrode through a rubber cord reinforced metal conductors having a side surface symmetrical longitudinal edges, the outer diameter of which is equal to the inner diameter of the pipe.

Thanks to the use as an explosive element in the form of a ring, a profile of one of the surfaces which are defined by a hyperbolic functionwhere α is the coefficient of proportionality, and the opposite surface is flat, the thickness of the rings increases from the peripheral to the Central part, provided the condition of homogeneity of the flow of electric current, and accordingly, platnost the current in any cross-section. Consequently, the processes of heating, melting, destruction, evaporation, explosion, the emergence of plasma formation, etc. in the electric explosion will be predictable. The electric energy of the capacitor drive more fully utilized in the formation of an electrical explosion. Therefore, we can assume that the flow of electrical explosion occurs simultaneously and uniformly throughout the volume of a hyperbolic ring of foil, and transmitting a condensed medium is generated flat shock-acoustic wave propagating along the deformable tube, representing in this case the waveguide, without energy loss. Ensuring the conditions of homogeneity of the electric explosion and optimal geometric dimensions of the explosive element (Krivitsky E.V. Dynamics of electrical explosion in a liquid. - Kiev: Naukova Dumka, 1986, - 205 C.), causes the expansion of the range of sizes explosive element, in our case, the ring of foil.

Thus, the use of explosive element in the form of a ring, a profile of one of the surfaces which are defined byand the opposite is flat, i.e. the thickness of the rings increases from the peripheral to the Central part thereof, allows Narodny electric explosion, to expand the list of sizes-blowing elements, to generate a flat shock-acoustic waves of high intensity and improve efficiency.

The use of rod insertion is made equal to the length of the body of rotation and the guide cone with centering stars, allows you to easily position the design in the deformation area of the pipe having small radii of curvature of the bends, expanding technological capabilities.

Flexible reinforced metal conductors rubber cord allows you to install and accurately positioning, by varying the length of the cord, rod insert with the guide cone and body rotation in the necessary hard-to-reach area of the deformation of the pipe, the appearance of which can be a complex geometry with different radii of curvature. The presence at his side surface symmetrical longitudinal ribs, and the outer diameter of the cord is equal to the inner diameter of the tube, provides alignment of the cord along the entire deformable pipe, regardless of the configuration and the radii of curvature, which allows free distribution of the shock-acoustic waves about curved section of pipe. Strong connection rod insertion electrode design through reinforced metal conductors pulling the RA avoids axial displacement of the guide cone and body rotation relative to the deformable zone of the pipe when subjected to shock waves, which has a positive impact on efficiency.

The use of rubber, which is a dielectric, in the manufacture of cord reinforced metal conductors provides the impossibility of the occurrence of parasitic electric discharge between the electrodes of the deformable tube and metal conductors.

Shock-acoustic wave compression high pressure distribution along the deformable tube communicates with the body rotation (Landau L.D., Lifshitz E.M. Theoretical physics. Hydrodynamics. - Moscow: Nauka, 1986, - 736 C.), thus there is a change of the profile of the wave front, therefore, the redistribution of the direction and magnitude of the impulse. Due to the multiple reflection waves from the surface of the body of rotation and the area of the deformed pipe occurs radial component of the force impulse, i.e. in the present zone is formed of shock-acoustic wave with redistributed wavefront providing axisymmetric deformation of the pipe. The presence of smoothing cone allows for minimal energy loss to produce the formation of the front shock-acoustic waves and the redistribution of the flow of energy in it, which increases efficiency.

The invention is illustrated by drawings, where figure 1 presents the scheme electrohydropulse method of fitting pipes in hard to reach places, figure 2 etc is dstable drawing ring of foil, profile one surface of which is defined byand the opposite is flat, i.e. the thickness in the radial cross section has a hyperbolic dependence on radius, figure 3 presents the appearance of a ring of foil with a slit in a radial cross-section in figure 4 shows a segment of a ring, which shows the distribution of the current lines on arbitrary cross-section, figure 5 presents a section view in cross section of a cord having a symmetrical longitudinal ribs on the lateral surface, figure 6 presents reinforced with metal cords of a cord made with symmetrical longitudinal ribs on the side.

At the end of mechanically rigid dielectric cylinder 1 (Fig 1), is a ring 2 of the foil, and the surface of the coupling ring and the base dielectric cylinder are flat. Height of ring 2 of the foil varies in the radial direction according to the hyperbolic law (figure 2, figure 3), in our case increases as approaching from the peripheral to the Central part thereof. This ensures the uniformity of the current density of the current flowing in the radial direction (figure 3). Figure 4 shows the line current, penetrating in the radial direction of the site S1and S2some of the selected segment ring 2 of the foil. Line current also show the s in the drawing, representing the appearance of the ring of foil with a slit in a radial cross-section. In the dielectric coaxial cylinder 1 is a through hole, in which is placed a rod electrode 3 connected electrical contact with the Central part of the ring 2 of the foil. The peripheral part of the ring 2 of the foil is fixed on the end surface of the dielectric cylinder 1 by means of a metal sleeve 4, is made with the inner collar and the second electrode. For waterproofing install rubber ring 5 at the end of a deformable tube 6. The diameter of the metal sleeve 4 is equal to the internal diameter of the tube 6. Rod box 7 side hyperbolic surface of ring 2 of the foil is connected with the rod electrode 3 through a rubber cord 8 reinforced metal conductors 9 (callout A) and having on the side surface of the symmetrical longitudinal ribs 10 (figure 5, 6), using a threaded connection. The inner diameter of the cord 8 is equal to the diameter of the Central part of the ring 2 foil, outer diameter equal to the inner diameter of the deformable tube 6. At the core of the insert 7 are guide cone 11, the body of revolution 12 and the spacer 13. As a body of revolution 12 can be used, for example a cylinder, the diameter of which is slightly less than the diameter of the deformable tube is 6. Presents the design is placed in the cavity of the pipe 6, and the dielectric cylinder 1 ring 2 foil electrodes 3 and 4 are mechanically firmly fixed on the end of a deformable tube 6. The body of revolution 12 and the guide cone 11 on the rod box 7 owing to the exact length of the reinforced cord 8 automatically arranged in a zone of deformation of the pipe coaxially through centering the sprocket 13. Deformed tube 6 is filled with the working of the transmitting medium 14, in particular water, and hydroisolyatsia from the opposite end of the rubber tube 15. The electrodes 3 and 4 connect the current-carrying wires with pulse current generator 16. When applying a high voltage on the Central and peripheral part of the ring 2 foil latter under the action of high current density uniformly explodes, forming in environmental transmitting medium 14 shock-acoustic pressure wave. Shock-acoustic wave, obviously having a planar wave front is propagated by the transmitting working environment 14 bounded by a pipe 6, in the direction of the zone of location of the body of rotation 12 and the guide cone 11 is not suffering energy loss. Thanks to the guiding cone 11 is a smooth change of the profile of the front shock-acoustic waves, and the energy flow is directed to the area between your body rotations the Oia 12 and deformable pipe 6. Shock-acoustic wave, radially acting on the pipe 6, produces an axisymmetric plastic deformation, and extending axially in the gap between the body of rotation 12 and the pipe 6, carries out the deformation of the pipe section over the entire length comparable to the length of the body of rotation 12. Changing the profile of rotation of a body 12 and a gap between the pipe 6 and the body of revolution 12, you can change the profile of the deformation of the pipe 6, and magnitude of the deformation. Thus, the application as explosive element of the ring of foil profile one surface of which defines a hyperbolic function, but the opposite is flat, i.e. the thickness in the radial cross section has a hyperbolic dependence on radius, allows a uniform electric explosion ring of foil, to expand the list of sizes exploding elements, to generate a flat shock-acoustic wave high intensity, thus increasing efficiency. Use rubber cord with on the side of the symmetrical longitudinal ribs, provides axial location along the deformable tube, regardless of the configuration and the radii of curvature of the pipe. What should the unchecked spread of the shock-acoustic waves on curved pipe section, thereby improves the efficiency.

Example

the experiments were applied to the energy storage capacitor type, with the following parameters: electric capacity C=320 pF, inductance L=78 mH maximum voltage U=2 kV. Used seamless aluminum tube with an inner diameter of DNR=25 mm and wall thickness hTr=0.22 mm, length lTr=25 cm, with External and internal diameter of the ring of aluminum foil, respectively, dEXT=23 mm, dwew=10 mm. Length rod insertion lsun=20 mm, length rubber cord lEE=12 cm, the outer diameter of the cord dthe cord. NR=25 mm, internal - dthe cord. NR=10 mm, the width of the longitudinal ribs hcord=2 mm In the experiments provided local axisymmetric deformation of the pipe at the specified location.

Electrohydropulse way fitting pipes in hard to reach places, including the installation of pipe in the hole of the tube, placing the tube end pre-assembled structures consisting of highly explosive element in the form of a ring of foil located at the end of mechanically rigid cylinder of dielectric material having a through axial opening in which is located a rod electrode connected electrical contact with the Central part of the ring of foil, a second electrode in the form of jaws metal sleeve located on the cylinder of a lock on its side on top of the spine of the peripheral part of the ring, connected with the rod electrode and resting on the centering insulating stars rod inserts mounted with the guide cone and the body of revolution made of mechanically strong material, the location of the body of rotation and the guide cone in the deformation area of the pipe, filling the cavity of the pipe transmitting medium, waterproofing pipe flexible tube one end and an annular gasket of another, the electrical explosion of the explosive element, characterized in that used pre-assembled design one surface of the ring of foil made profile for hyperbolic functionsand the opposite surface is flat, with a thickness increasing from the peripheral to the Central part, the core insert is connected with the rod electrode through a rubber cord reinforced metal conductors having a side surface symmetrical longitudinal edges, the outer diameter of which is equal to the inner diameter of the pipe.



 

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