Hydroelectric shock wave generator of combined focusing structure

Abstract

The invention discloses a hydroelectric shock wave generator of a combined focusing structure. The hydroelectric shock wave generator comprises a conduction structure, a focusing body, a discharge electrode pair, a wire and an electrode-wire switching part, the device can adapt to the propagation characteristic that shock waves evolve along with an electric arc channel, the energy density of the shock waves is intensified through targeted focusing, the energy utilization rate of the liquid electric shock waves is effectively increased, and finally efficient and lossless demolding of the roller and the mold is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of liquid-electric shock, and particularly relates to a liquid-electric shock wave generator with combined focusing structure. BACKGROUND

[0002] Pulse discharge in water can generate shock waves with strong mechanical effects, which can be applied to roll stripping. By generating liquid-electric effect in the closed space of the roll stripping liquid-electric shock wave generator, the shock wave is propagated to the interface between the mold-sand and the sand-roller through the conducting structure. Due to the difference in elastic modulus and vibration frequency, the sand at the interface will be crushed and separated from the roller and the mold, thus completing the roll stripping.

[0003] After the breakdown of the gap in the pulse discharge in water, the liquid-electric shock wave is generated due to the expansion of the arc channel. The shape of the arc changes accordingly with the passage of time, gradually changing from a column to a sphere. The propagation pattern of the shock wave is closely related to the shape of the arc, and the propagation directions of shock waves with different patterns are different.

[0004] The existing roll stripping methods mostly use the way of crane impact stripping. The huge impact force generated by the impact can seriously damage the mold, resulting in quality problems of the roll and causing adverse effects on the construction site. The shock wave technology based on liquid-electric effect can efficiently crush the sand layer between the roll and the mold without damaging the mold and the roll. However, the liquid-electric shock wave presents diversified propagation patterns with the dynamic evolution of the arc channel. The existing single focusing structure cannot adapt to the propagation characteristics, resulting in weak focusing effect of the shock wave, low energy utilization rate, and difficulty in meeting the efficient stripping demand. SUMMARY

[0005] The present application aims to provide a liquid-electric shock wave generator with combined focusing structure, which comprises a conducting structure, a focusing body, a pair of discharge electrodes, an O-ring, a wire, and an electrode-wire adapter.

[0006] The conducting structure, the focusing body, the electrode-wire adapter, and the O-ring are assembled to form a closed space for filling with conductive liquid medium;

[0007] The conducting structure is used to isolate the high-temperature roll from the liquid medium to prevent the conductive liquid medium from being vaporized due to high temperature;

[0008] The focusing structure of the focusing body comprises a planar focusing section, an ellipsoidal focusing section, a parabolic focusing section, and a cylindrical focusing section in sequence;

[0009] The focusing surfaces of the planar focusing section, the ellipsoidal focusing section, the parabolic focusing section, and the cylindrical focusing section are planar, ellipsoidal, parabolic, and cylindrical, respectively;

[0010] The pair of discharge electrodes are arranged inside the focusing body.

[0011] The discharge electrode pair is connected with the wire through an electrode-wire adapter, so as to receive external power supply through the wire;

[0012] The discharge electrode performs pulsed discharge in the conductive liquid medium, and an electric breakdown occurs and an arc channel is generated, and the shock wave generated by the expansion of the arc channel is focused by the focusing structure of the focusing body to form a parallel liquid-electric shock wave, and is conducted to the mold through the conducting structure to achieve non-destructive demolding of the roller.

[0013] Further, the conductive liquid medium is a water medium.

[0014] Further, the electrode-wire adapter is connected with the external wire through a wire joint;

[0015] The wire joint is fixed on the electrode-wire adapter by a nut;

[0016] The electrode-wire adapter surface is provided with a sealing groove, and an O-ring is embedded in the sealing groove to ensure the sealing of the closed space.

[0017] Further, the conducting structure surface is provided with a sealing groove, and an O-ring is embedded in the groove to ensure the sealing of the closed space.

[0018] Further, the end of the electrode-wire adapter is a bending structure to ensure that the center of the discharge electrode coincides with the focal point, while increasing the surface distance of the adapter on the inner surface of the focusing body to avoid surface breakdown.

[0019] Further, when the discharge electrode performs pulsed discharge, the initial arc channel is columnar, generating a columnar shock wave, and then evolving from columnar to spherical, generating a spherical shock wave, and finally focusing through the focusing structure of the focusing body to form a horizontally propagating parallel wave, and shooting into the conducting structure.

[0020] Further, the columnar shock wave is focused by a plane, and the columnar shock wave propagates horizontally in all directions, and a part of it directly transmits to the conducting structure, and another part is reflected after being reflected by the beam focusing plane, and is horizontally shot into the conducting structure.

[0021] Further, the spherical shock wave is focused by an ellipsoidal surface and a parabolic surface, the geometric right focal point of the ellipsoidal surface coincides with the geometric focal point of the parabolic surface, and the coincident focal point is also the center point of the discharge channel;

[0022] The spherical shock wave radiates in all directions, and a part of it directly propagates to the conducting structure, and another part is reflected and focused after being reflected by the focusing plane;

[0023] The shock wave directly transmitted to the conducting structure is generated from the coincident focal point, and after being focused by the parabolic surface, it forms a horizontally propagating parallel wave and is shot into the conducting structure;

[0024] The shock wave propagating in the opposite direction of the conducting structure is generated from the coincident focus, is reflected and concentrated by the ellipsoidal surface, is shot to the other focus of the ellipsoidal surface, is reflected and concentrated again by the parabolic surface, and finally forms the parallel wave of horizontal propagation which is shot into the conducting structure.

[0025] Further, the diameter of the concentrating plane is designed to be slightly larger than the tip distance of the two electrodes.

[0026] The technical effect of the present application is self-evident. The present application provides a liquid-electric shock wave generator with a multi-focusing structure, which generates shock waves of different propagation forms by combining the evolution process of the pulsed discharge arc channel in water, and designs a combined focusing structure of plane-ellipsoidal surface-parabolic surface-cylindrical surface.

[0027] Each focusing structure of the present application corresponds to the shock wave generated by the focusing arc channel in different forms, maximizes the mechanical energy utilization of the liquid-electric shock wave, and achieves better application effect.

[0028] The present application utilizes the shock wave with strong mechanical effect generated by pulsed discharge in water, and combines the characteristics of arc channel evolution process to design a shock wave generator with a combined focusing structure. The combined focusing structure can adapt to the propagation characteristics of the shock wave with the evolution of the arc channel, intensify the energy density of the shock wave by targeted focusing, effectively improve the energy utilization rate of the liquid-electric shock wave, and finally realize efficient and non-destructive demolding of the roll and the die. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a component of the liquid-electric shock wave generator;

[0030] Figure 2 It is a combined liquid-electric shock wave concentrating structure;

[0031] Figure 3 It is a schematic diagram of cylindrical shock wave concentrating;

[0032] Figure 4 It is a schematic diagram of spherical shock wave directly concentrating by parabolic surface;

[0033] Figure 5 It is a schematic diagram of spherical shock wave concentrating by ellipsoidal surface-parabolic surface combination;

[0034] In the figure, the conducting structure 1, the focusing body 2, the discharge electrode 3, the electrode-wire adapter 4, the wire 5, the wire joint 6, the M4 nut 7, the M6 nut 8, the fixing screw 9, the O-ring 10, the concentrating plane A, the ellipsoidal surface B, the parabolic surface C, the cylindrical surface D, the cylindrical shock wave 11, the arc 12, the left focus 13, the right focus 14, the spherical shock wave 15. DETAILED DESCRIPTION

[0035] The application will be further described in conjunction with the following examples, but should not be understood as limiting the above-mentioned subject matter of the application to the following examples. Various substitutions and changes can be made according to ordinary technical knowledge and conventional means without departing from the technical idea of the application, and all should be included in the protection scope of the application.

[0036] Example 1

[0037] A liquid-electric shock wave generator with a combined focusing structure comprises a conducting structure, a focusing body, a pair of discharge electrodes, an O-ring, a wire and an electrode-wire adapter component.

[0038] The conducting structure, the focusing body and the electrode-wire adapter component, and the O-ring are assembled to form a sealed space for filling with a conductive liquid medium (i.e. the liquid medium is inside the focusing body, and the open part of the focusing body is sealed by the conducting structure and the adapter component);

[0039] The conducting structure is used to isolate the high-temperature roller from the liquid medium to prevent the conductive liquid medium from vaporizing due to high temperature;

[0040] The focusing structure of the focusing body is in sequence of a planar focusing section, an ellipsoidal focusing section, a parabolic focusing section and a cylindrical focusing section.

[0041] The focusing surfaces of the planar focusing section, the ellipsoidal focusing section, the parabolic focusing section and the cylindrical focusing section are respectively a plane, an ellipsoid, a parabola and a cylinder.

[0042] The pair of discharge electrodes is arranged inside the focusing body.

[0043] The pair of discharge electrodes is connected with the wire through the electrode-wire adapter component, so as to receive external power supply through the wire.

[0044] The discharge electrodes perform pulse discharge in the conductive liquid medium, generate an electric breakdown and produce an arc channel, and the shock wave generated by the expansion of the arc channel is focused by the focusing structure of the focusing body to form parallel liquid-electric shock waves, which are then conducted to the mold through the conducting structure to realize non-destructive demolding of the roller.

[0045] The conductive liquid medium is a water medium.

[0046] The electrode-wire adapter component is connected with the external wire through a wire joint.

[0047] The wire joint is fixed on the electrode-wire adapter component by a nut.

[0048] A sealing groove is formed on the surface of the electrode-wire adapter component, and an O-ring is embedded in the sealing groove to ensure the sealing property of the sealed space.

[0049] The conducting structure is provided with a sealing groove, and an O-shaped ring is embedded in the groove to ensure the sealing of the sealed space.

[0050] The end of the electrode-wire adapter is in a bent structure to ensure that the center of the discharge electrode coincides with the focus point, and to increase the distance of the adapter along the surface of the focusing body, thereby avoiding surface breakdown.

[0051] When the discharge electrode performs pulse discharge, the initial arc channel is columnar, a columnar shock wave is generated, then the columnar shock wave evolves into a spherical shock wave, and finally the spherical shock wave is focused by the focusing structure of the focusing body to form a horizontal parallel wave which is transmitted into the conducting structure.

[0052] The columnar shock wave is focused by a plane, and the columnar shock wave is horizontally transmitted to the surrounding, and a part of the columnar shock wave is directly transmitted to the conducting structure, and another part of the columnar shock wave is reflected by the focusing plane and then horizontally transmitted to the conducting structure.

[0053] The spherical shock wave is focused by an ellipsoidal surface and a parabolic surface, the geometric right focus of the ellipsoidal surface coincides with the geometric focus of the parabolic surface, and the coincident focus is also the center point of the discharge channel.

[0054] The spherical shock wave is radially transmitted to the surrounding, and a part of the spherical shock wave is directly transmitted to the conducting structure, and another part of the spherical shock wave is reflected and focused by the focusing plane.

[0055] The shock wave directly transmitted to the conducting structure is generated from the coincident focus, and the shock wave is focused by the parabolic surface to form a horizontal parallel wave which is transmitted into the conducting structure.

[0056] The shock wave transmitted to the conducting structure in the opposite direction is generated from the coincident focus, and the shock wave is reflected and focused by the ellipsoidal surface to be transmitted to another focus of the ellipsoidal surface, and then the shock wave is reflected and focused by the parabolic surface to form a horizontal parallel wave which is transmitted into the conducting structure.

[0057] The diameter of the focusing plane is slightly larger than the distance between the two electrode tips (i.e. the discharge gap).

[0058] The conducting structure is made of a rigid material, such as a metal material, which has the characteristics of pressure resistance and high temperature resistance.

[0059] Embodiment 2

[0060] A liquid-electric shock wave generator with a combined focusing structure includes a conducting structure, a focusing body, a pair of discharge electrodes, a wire, and an electrode-wire adapter.

[0061] The conducting structure, the focusing body, and the electrode-wire adapter are assembled to form a sealed space for filling with a conductive liquid medium.

[0062] The conducting structure is used to isolate the high-temperature roller from the liquid medium to prevent the conductive liquid medium from being vaporized due to high temperature.

[0063] The focusing structure of the focusing body is in turn a planar focusing section, an ellipsoidal focusing section, a parabolic focusing section, and a cylindrical focusing section.

[0064] The focusing surfaces of the planar focusing section, the ellipsoidal focusing section, the parabolic focusing section, and the cylindrical focusing section are respectively a plane, an ellipsoid, a parabola, and a cylinder.

[0065] The pair of discharge electrodes is arranged inside the focusing body.

[0066] The pair of discharge electrodes is connected to the wire through an electrode-wire adapter, so as to receive external power supply through the wire.

[0067] The discharge electrodes perform pulsed discharge in the conductive liquid medium, electric breakdown occurs and an arc channel is generated, the shock wave generated by the expansion of the arc channel is focused by the focusing structure of the focusing body to form parallel liquid-electric shock waves, and the liquid-electric shock waves are conducted to the die through the conducting structure, so as to realize non-destructive die release of the roller.

[0068] Embodiment 3:

[0069] A liquid-electric shock wave generator with a combined focusing structure, the technical content of which is the same as that of any one of embodiments 2-3, further, the conductive liquid medium is a water medium.

[0070] Embodiment 4:

[0071] A liquid-electric shock wave generator with a combined focusing structure, the technical content of which is the same as that of any one of embodiments 2-3, further, the electrode-wire adapter is connected to the external wire through a wire joint.

[0072] The wire joint is fixed to the electrode-wire adapter by a nut.

[0073] A sealing groove is formed on the surface of the electrode-wire adapter, and an O-ring is embedded in the sealing groove to ensure the sealing of the sealed space.

[0074] Embodiment 5:

[0075] A liquid-electric shock wave generator with a combined focusing structure, the technical content of which is the same as that of any one of embodiments 2-4, further, a sealing groove is formed on the surface of the conducting structure, and an O-ring is embedded in the groove to ensure the sealing of the sealed space.

[0076] Embodiment 6:

[0077] A liquid-electric shock wave generator with a combined focusing structure, the technical content of which is the same as that of any one of embodiments 2-5, further, the end of the electrode-wire adapter is a bent structure, so that the included angle between the discharge electrode and the electrode-wire adapter is less than 180 O .

[0078] Embodiment 7:

[0079] A liquid-electric shock wave generator with combined focusing structure, the technical content is the same as any one of embodiments 2-6, further, when the discharge electrode performs pulse discharge, the initial arc channel is columnar, a columnar shock wave is generated, then the columnar shock wave evolves into a spherical shock wave, and finally the spherical shock wave evolves into a spherical horizontal propagation parallel wave and is shot into the transmission structure.

[0080] Embodiment 8:

[0081] A liquid-electric shock wave generator with combined focusing structure, the technical content is the same as any one of embodiments 2-7, further, the columnar shock wave is focused by a plane, and the columnar shock wave propagates horizontally in all directions, part of which is directly transmitted to the transmission structure, and the other part is reflected by the focusing plane and horizontally shot into the transmission structure.

[0082] Embodiment 9:

[0083] A liquid-electric shock wave generator with combined focusing structure, the technical content is the same as any one of embodiments 2-8, further, the spherical shock wave is combined and focused by an ellipsoidal surface and a parabolic surface, the geometric right focus of the ellipsoidal surface coincides with the geometric focus of the parabolic surface, and the coincident focus is also the center point of the discharge channel;

[0084] The spherical shock wave radiates in all directions, part of which is directly transmitted to the transmission structure, and the other part is reflected and focused after focusing;

[0085] The shock wave directly transmitted to the transmission structure is generated from the coincident focus, and after being focused by the parabolic surface, a horizontally propagating parallel wave is formed and shot into the transmission structure;

[0086] The shock wave propagating in the opposite direction of the transmission structure is generated from the coincident focus, reflected and focused by the ellipsoidal surface, shot towards the other focus of the ellipsoidal surface, reflected and focused again towards the parabolic surface, and finally a horizontally propagating parallel wave is formed and shot into the transmission structure.

[0087] Embodiment 10:

[0088] A liquid-electric shock wave generator with combined focusing structure, the technical content is the same as any one of embodiments 2-9, further, the diameter of the focusing plane is designed to be slightly larger than the gap distance.

[0089] Embodiment 11:

[0090] In order to better promote the application of liquid-electric effect in the field of roll demolding, a liquid-electric shock wave generator with combined focusing structure is proposed. The invention points include the following parts:

[0091] 1. The inside of the shock wave generator needs to be filled with water medium, so a sealed space needs to be formed and sealed. It is assembled into a sealed space by focusing body, electrode-wire adapter and conducting structure; the adapter and the conducting structure are provided with a sealing groove on the surface, and an O-ring is embedded in the groove. When assembling, the O-ring is deformed and sealed by the extrusion of the focusing body and the two, effectively avoiding water seepage. In addition, the conducting structure can isolate the high-temperature roller from the water medium, prevent water from vaporizing due to high temperature and cause danger, and improve safety.

[0092] 2. In order to improve the energy utilization efficiency of liquid-electric shock wave and achieve better application effect, the application designs a combined focusing structure combined with the evolution characteristics of water pulse discharge arc channel shape, characterized in that: the combined focusing structure is segmented into plane-ellipsoid-parabolic surface-cylinder surface, and different focusing surfaces can correspond to shock waves generated in different arc evolution stages.

[0093] 3. Since the shock wave generator needs to apply 10kV high voltage to the electrode when applied, and the inside is filled with water with certain conductivity, high voltage will promote current discharge along the conductive path formed on the inner surface, causing breakdown. The application proposes a special electrode structure design, which designs the end of the electrode-wire adapter as a bending structure, strictly ensures that the electrode pair falls near the focal point, increases the surface distance of the electrode pair on the inner surface of the generator, avoids internal surface breakdown, and significantly improves the running safety and reliability of the equipment under high voltage working condition.

[0094] In specific implementation, after assembling each part of the shock wave generator, the container is filled with water medium through the water injection port on the surface of the conducting structure, and sealed with a water plug. Then, a 10kV high voltage pulse is applied to the electrode through the two-pole wire, and then water pulse discharge is carried out in the electrode gap, electric breakdown occurs and an arc channel is generated. The initial arc channel is columnar, corresponding to the generation of columnar shock wave, mainly focused by the plane, as shown in Figure 3 . It propagates horizontally to all directions, part of which directly transmits to the conducting structure, and the other part is reflected after being focused by the focusing plane, and then horizontally enters the conducting structure, so that the focusing of the columnar shock wave is better realized. Considering that the length of the columnar arc is about the gap length, the diameter of the focusing plane is designed to be slightly larger than the gap distance to ensure full coverage focusing.

[0095] When the arc channel evolves from columnar to spherical, a spherical shock wave is generated, which is mainly focused by the combination of ellipsoid and parabolic surface, as shown in Figure 4 、 Figure 5As shown, and the geometric right focus of the ellipsoid coincides with the geometric focus of the parabola, and the coincident focus is also the center point of the discharge channel. The spherical shock wave spreads radially in all directions, part of which directly propagates to the conducting structure, and the other part is reflected and focused after focusing. The shock wave is generated from the coincident focus, and after being focused by the parabolic surface, a series of horizontally propagating parallel waves are formed and injected into the conducting structure; the shock wave propagating in the opposite direction of the conducting structure is also generated from the coincident focus, and after being reflected and focused by the ellipsoidal surface, it is shot at the other focus (left focus) of the ellipsoidal surface, and then again after being reflected and focused by the parabolic surface, it still forms a group of horizontally propagating parallel waves and is injected into the conducting structure. Because the conducting structure only conducts the shock wave in a certain area, the tail end of the cylindrical surface can recover part of the shock wave energy beyond the range, realizing the maximum utilization of the liquid-electric shock wave energy.

[0096] After focusing by the above-mentioned focusing surfaces, the liquid-electric shock wave forms an energy beam mainly composed of parallel waves. Such parallel waves can be efficiently conducted to the mold in the conducting structure because of small reflection loss at the medium interface, and can accurately act on the sand layer between the mold and the roller and destroy it, finally realizing non-destructive demolding of the roller.

Claims

1. A liquid electro-impact wave generator with a combined focusing structure, characterized in that: The conductive structure, focusing body, discharge electrode pair, O-ring, wire and electrode-wire adapter component are included. The conductive structure, focusing body and electrode-wire adapter component, O-ring are assembled to form a sealed space for filling with conductive liquid medium. The conductive structure is used to isolate the high-temperature roller from the liquid medium and prevent the conductive liquid medium from vaporizing due to high temperature. The focusing structure of the focusing body is sequentially a plane focusing section, an ellipsoid focusing section, a parabolic focusing section and a cylindrical focusing section. The focusing surfaces of the plane focusing section, the ellipsoid focusing section, the parabolic focusing section and the cylindrical focusing section are respectively a plane, an ellipsoid, a parabola and a cylinder. The discharge electrode pair is arranged inside the focusing body. The discharge electrode pair is connected with the wire through the electrode-wire adapter component, so as to receive external power supply through the wire. The discharge electrode performs pulse discharge in the conductive liquid medium, generates an electric breakdown and an arc channel, and the shock wave generated by the expansion of the arc channel is focused by the focusing structure of the focusing body to form a parallel liquid-electric shock wave, which is then conducted to the mold through the conductive structure to achieve non-destructive demolding of the roller.

2. A liquid electrostatic shock wave generator with a combined focusing structure according to claim 1, characterized in that: The conductive liquid medium is water medium.

3. The liquid electrostatic shock wave generator of claim 1, wherein: The electrode-wire adapter component is connected with the external wire through a wire joint. The wire joint is fixed on the electrode-wire adapter component by a nut. The electrode-wire adapter component is provided with a sealing groove on the surface, and an O-ring is embedded in the sealing groove to ensure the sealing of the sealed space.

4. The liquid electrostatic shock wave generator of claim 1, wherein: The conductive structure is provided with a sealing groove on the surface, and an O-ring is embedded in the groove to ensure the sealing of the sealed space.

5. The liquid electrostatic shock wave generator of claim 1, wherein: The end of the electrode-wire adapter component is a bending structure, which ensures that the center of the discharge electrode coincides with the focal point and increases the surface distance of the adapter component on the inner surface of the focusing body to avoid surface breakdown.

6. The liquid electrostatic shock wave generator of claim 1, wherein: When the discharge electrode performs pulse discharge, the initial arc channel is columnar, generating a columnar shock wave, which then evolves into a spherical shock wave, and finally forms a horizontal parallel wave after being focused by the focusing structure of the focusing body and is shot into the conductive structure.

7. A liquid electrostatic shock wave generator with a combined focusing structure according to claim 6, characterized in that: The columnar shock wave is focused by the plane, and the columnar shock wave propagates horizontally in all directions, with a part directly transmitted to the conductive structure and another part reflected by the focusing plane and horizontally shot into the conductive structure.

8. The liquid electrostatic shock wave generator of claim 6, wherein: The spherical shock wave is focused by the combination of the ellipsoid and the parabola, and the geometric right focal point of the ellipsoid coincides with the geometric focal point of the parabola, and the coincident focal point is also the center point of the discharge channel. The spherical shock wave radiates in all directions, with a part directly transmitted to the conductive structure and another part reflected and focused after being reflected by the focusing surface. The shock wave directly transmitted to the conductive structure is generated from the coincident focal point, and forms a horizontal parallel wave after being focused by the parabolic surface and is shot into the conductive structure. The shock wave propagating in the opposite direction of the conductive structure is generated from the coincident focal point, reflected and focused by the ellipsoid, shot towards the other focal point of the ellipsoid, reflected and focused again towards the parabola, and finally forms a horizontal parallel wave shot into the conductive structure.

9. The liquid electrostatic shock wave generator of claim 1, wherein: The diameter of the focusing plane is greater than the distance between the tips of the two electrodes.

Images