Durable high-voltage direct-current cable for dust filter

Abstract

The invention provides a durable high-voltage direct-current cable for a dust filter, and belongs to the technical field of cables, the durable high-voltage direct-current cable comprises three insulating sheaths, battery cells are embedded in the insulating sheaths, the insulating sheaths are spirally wound with one another, the outer sides of the insulating sheaths are sleeved with buffer layers, and the buffer layers are arranged on the outer sides of the insulating sheaths. The outer side of the buffer layer is sleeved with a reaction layer. Through the spiral winding of the insulating sheath and the external reverse spiral special-shaped spring, the bending tensile toughness and the bending fracture resistance of the cable are enhanced, the irregular bending requirement in the moving use of the dust filter is met, when the cable is excessively bent, the inner side of the special-shaped spring is extruded, the special section of the special-shaped spring forms shearing force, the buffer sleeve is broken, and the service life of the cable is prolonged. Substances flowing out of the buffer sleeve and powder of the reaction layer are subjected to normal-temperature silane crosslinking reaction, a flexible supporting point is formed at a bending point, the cable is prevented from being bent, an insulating sheath is prevented from being broken, the supporting point is self-started and self-positioned, and the service life of the dust filter is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a high-voltage DC cable for a durable dust filter. Background Art

[0002] A high-voltage DC cable for a durable dust filter is a cable specifically used for dust filter equipment to transmit high-voltage direct current. It is mainly used in the electrostatic dust removal systems of enterprises such as steel mills, cement plants, and power plants. As the power connection line between the rectifier transformer and the electrostatic precipitator, in a DC distribution circuit of 75 kV and below, it transmits electrical energy to the dust filter equipment, enabling the dust filter to maintain an electrostatic field sufficient to ionize the gas through high-voltage direct current, realizing the separation of dust and gas, and achieving the dust removal effect; Chinese Patent Authorization Announcement CN215527298U discloses a drum cable structure, including an installation sleeve, in which three brackets are fixedly installed. One end of the three brackets is fixedly connected to the inner wall of the installation sleeve, and the other ends are fixedly connected to each other, aiming to solve the problem that after the existing drum cable is used for a period of time, the electric core is prone to displacement, and as the cable is wound, the electric core is more likely to be displaced, resulting in easier fracture inside the cable, thereby shortening the service life of the drum cable and increasing the use cost. The above-mentioned prior art solutions have the following deficiencies: Since in the telescopic components of the dust filter, such as robotic arms and lifting mechanisms, the use of the cable requires frequent and irregular bending. Due to the relatively simple external structure of the electric core in the existing cable, the toughness of the external protective layer material needs to be utilized to meet the bending requirements of the cable. However, the electric core is generally made of copper wire. When the bending degree is too large, since the structure of the electric core is not easy to change, the electric core is prone to fracture. Therefore, there is room for improvement. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: the problem that the prior art is not easy to perform fixed-point support and strengthening according to the over-bending points during the use of the cable. The present invention proposes a high-voltage DC cable for a durable dust filter.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A high-voltage DC cable for a durable dust filter, comprising: an insulating sheath, there are three insulating sheaths, cores are embedded inside each insulating sheath, the insulating sheaths are helically wound with each other, a buffer layer is sleeved outside the insulating sheaths, limiting members are fixedly arranged at equal intervals between the buffer layer and the insulating sheaths, a reaction layer is sleeved outside the buffer layer, and an outer protective sleeve is sleeved outside the reaction layer; The buffer layer includes fixing rings, a special-shaped spring is wound and connected between the outer walls of adjacent fixing rings, the spiral direction of the special-shaped spring is opposite to the spiral direction of the insulating sheath, a buffer sleeve is fixedly connected between adjacent fixing rings, hydroxyl-terminated silicone oil is filled inside the buffer sleeve, the buffer sleeve is located inside the special-shaped spring, the cross-section of the special-shaped spring is an obtuse triangle, the obtuse edge of the special-shaped spring faces the insulating sheath, the obtuse edge of the special-shaped spring is provided with a rounded corner, and the spiral edge formed by the acute angles of the special-shaped spring is serrated; The reaction layer includes a connecting ring fixedly sleeved on the outer wall of the fixing ring, an isolation sleeve is fixedly sleeved on the outer wall of the connecting ring, a powder bin is arranged on the inner wall of the isolation sleeve, and methyltrimethoxysilane powder is filled inside the powder bin.

[0005] Preferably, sliding grooves are equidistantly arranged on the outer wall of the fixing ring, and the special-shaped spring is embedded into the sliding grooves and wound around the outer wall of the fixing ring.

[0006] Preferably, the special-shaped spring is made of stainless steel, the serrated edges of the acute-angle spiral edges of the special-shaped spring expose the metal parts, and the surfaces of the rest of the special-shaped spring are coated with a silicone rubber coating.

[0007] Preferably, the buffer sleeve includes a limiting frame A, a storage bag is embedded inside the limiting frame A, and isolation strips are thermally welded on the storage bag to form a plurality of adjacent solution bins.

[0008] Preferably, the limiting frame A is in a grid shape, both ends of the buffer sleeve are connected to the sides of adjacent fixing rings by hot melting, and the limiting frame A is made of silicone rubber.

[0009] Preferably, the storage bag is filled with hydroxyl-terminated silicone oil, and the storage bag is made of polyimide film.

[0010] Preferably, limiting frames B are equidistantly fixed on the inner wall of the isolation sleeve, isolation sheets are fixed at the open ends of the limiting frames B, the powder bin is located inside the limiting frames B, micropores are arranged on the surfaces of the isolation sheets, and the diameter of the micropores is 0.1 - 0.5 mm.

[0011] Preferably, the isolation sleeve, the limiting frames B and the isolation sheets are of an integral flexible sheet structure, and the isolation sleeve is adhesively wrapped on the outer wall of the connecting ring by hot melting.

[0012] Preferably, the interior of the powder bin is also filled with nano calcium carbonate and bismuth octoate. Nano calcium carbonate, bismuth octoate and methyltrimethoxysilane are mixed and filled in the powder bin. The proportion of nano calcium carbonate is 30%, the proportion of bismuth octoate is 0.8%, and the proportion of methyltrimethoxysilane is 69.2%.

[0013] Preferably, the limiting member includes a clamping block. A clamping groove is arranged inside the clamping block. There are three clamping blocks, which are connected by heat melting between the clamping blocks. The outer wall of the insulating sheath fits with the inner wall of the clamping groove.

[0014] Compared with the prior art, the beneficial effects of the present invention include: through the spiral winding between the insulating sheaths and the external reverse spiral-shaped special-shaped spring, the bending and tensile toughness of the whole high-voltage DC cable itself is improved. At the same time, the elastic resetability of the special-shaped spring is utilized to improve the anti-bending and fracture resistance of the high-voltage DC cable, so as to meet the irregular repeated bending requirements of the high-voltage DC cable during the mobile use of the dust filter. At the same time, the deformation of the special-shaped spring itself during bending is utilized to squeeze the inner side of the bend. Combined with the cross-sectional structure characteristics of the special-shaped spring, a shearing force is formed, causing the buffer sleeve to rupture. Then, in cooperation with the reaction layer, through the room-temperature silane cross-linking reaction, flexible support points are formed at the bending points between the buffer layer and the reaction layer, thereby improving the anti-bending property of the cable at this position, avoiding the long-term over-bending state at this position, preventing the bending fracture of the insulating sheath, and ensuring the operation service life of the dust filter. Since the formation of the support points is affected by the bending use state of the cable, self-starting and self-positioning effects are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure of the present invention will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes and are not intended to limit the protection scope of the present invention. In the drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows a three-dimensional structure diagram according to an embodiment of the present invention; Figure 2 Schematically shows a three-dimensional cross-sectional structure diagram of the reaction layer according to an embodiment of the present invention; Figure 3 Schematically shows a cross-sectional structure diagram of the special-shaped spring according to an embodiment of the present invention; Figure 4 Schematically shows a three-dimensional structure diagram of the distribution of the special-shaped spring according to an embodiment of the present invention; Figure 5 Schematically shows according to an embodiment of the present invention Figure 2 The three-dimensional structure diagram at position A in; Figure 6 Schematically shows a three-dimensional structure diagram of the limiting member according to an embodiment of the present invention; Figure 7 Schematically shows a three-dimensional unfolded structure diagram of the buffer sleeve according to an embodiment of the present invention; Figure 8Schematically shows a three-dimensional structural diagram of the deployment of the isolation sleeve according to an embodiment of the present invention.

[0016] Reference numerals in the figure: 1, insulating sheath; 2, battery cell; 3, limiting member; 31, clamping block; 32, clamping groove; 4, buffer layer; 41, fixing ring; 42, sliding groove; 43, special-shaped spring; 44, buffer sleeve; 441, limiting frame A; 442, storage bladder; 443, isolation strip; 5, reaction layer; 51, connecting ring; 52, isolation sleeve; 53, powder bin; 54, limiting frame B; 55, isolation sheet; 6, outer protective sleeve. Detailed implementation manner

[0017] It is easy to understand that according to the technical solution of the present invention, without changing the essence of the present invention, those of ordinary skill in the art can propose various replaceable structural forms and implementation manners. Therefore, the following detailed implementation manners and the accompanying drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as all of the present invention or as a limitation or restriction on the technical solution of the present invention.

[0018] In order to solve the problem that it is not easy to perform fixed-point support and strengthening according to the over-bending points during the use of the cable in the prior art, the following solution is disclosed. Specifically, as Figures 1-8 shown: A high-voltage DC cable for a durable dust filter includes: three insulating sheaths 1, the inside of each insulating sheath 1 is embedded with a battery cell 2, the insulating sheaths 1 are helically wound with each other, the outside of the insulating sheaths 1 is sleeved with a buffer layer 4, limiting members 3 are fixedly arranged at equal intervals between the buffer layer 4 and the insulating sheaths 1, the outside of the buffer layer 4 is sleeved with a reaction layer 5, and the outside of the reaction layer 5 is sleeved with an outer protective sleeve 6; the buffer layer 4 includes a fixing ring 41, a special-shaped spring 43 is wound and connected between the outer walls of adjacent fixing rings 41, the spiral direction of the special-shaped spring 43 is opposite to the spiral direction of the insulating sheath 1, a buffer sleeve 44 is fixedly connected between adjacent fixing rings 41, the inside of the buffer sleeve 44 is filled with hydroxyl-terminated silicone oil, the buffer sleeve 44 is located inside the special-shaped spring 43, the cross-section of the special-shaped spring 43 is an obtuse triangle, the obtuse edge of the special-shaped spring 43 faces the insulating sheath 1, the obtuse edge of the special-shaped spring 43 is provided with a rounded corner, and the spiral edge formed by the acute angles of the special-shaped spring 43 is serrated; the reaction layer 5 includes a connecting ring 51 fixedly sleeved on the outer wall of the fixing ring 41, an isolation sleeve 52 is fixedly sleeved on the outer wall of the connecting ring 51, a powder bin 53 is arranged on the inner wall of the isolation sleeve 52, and the inside of the powder bin 53 is filled with methyltrimethoxysilane powder.

[0019] Specifically, as Figures 1-4As shown in the figure, when the cable is bent, the bending deformation of the special-shaped spring 43 is utilized to reduce the gap between the inner acute spiral edges. Moreover, due to the bending of the cable, the degree of extrusion between the buffer sleeves 44 on the bending inner side increases, so that they deform and gradually approach the special-shaped spring 43. When the total bending degree of the cable reaches the preset value, the bending curvature of the special-shaped spring 43 is too large, causing strong extrusion of the edges, thereby forming a shearing effect on the buffer sleeve 44, making the hydroxy-terminated silicone oil and methyltrimethoxysilane powder in the over-bent part contact, undergo a hydrolysis condensation reaction, and forming a flexible solidified body within 30 minutes for the reaction layer 5, thereby forming a flexible support for the over-bent position of the cable to resist the bending stress of the cable, reduce the compression and over-bending of the insulating sheath 1, and prevent breakage. The conventionally conceivable traditional extrusion method (such as the rupture of an elastomer under pressure) may be mis-triggered due to slight bending or vibration, while the spring cutting mechanism achieves precise triggering through geometric shape and mechanical threshold, avoiding misoperation during normal bending, realizing spontaneity and self-starting effect. And due to the silicone rubber elastomer formed by the reaction, it has an elastic effect itself and will not affect the flexion and extension movement of the cable during subsequent use. That is, through this reaction, self-support is formed for the over-bent position generated during the use of the cable to prevent frequent over-bending at this position of the cable and prevent the insulating sheath 1 from breaking.

[0020] The outer wall of the fixing ring 41 is equidistantly provided with sliding grooves 42, and the special-shaped spring 43 is embedded in the sliding grooves 42 and wound around the outer wall of the fixing ring 41; the special-shaped spring 43 is made of stainless steel, and the serrated edges of the acute spiral edges of the special-shaped spring 43 expose the metal parts, and the surfaces of the remaining special-shaped springs 43 are all coated with a silicone rubber coating; specifically, as Figures 3-5 shown in the figure, the sliding grooves 42 are utilized to facilitate the limitation of the special-shaped spring 43, so as to ensure that the obtuse edges of the special-shaped spring 43 face inwards and prevent the sharp edges from facing inwards. And with the obtuse angle design, when the cable is bent, when the buffer sleeve 44 deforms and expands outwards normally on the bending side, it will not directly contact the sharp edges, reducing the probability of mis-cutting. The serrated structure of the acute spiral edges of the special-shaped spring 43 is utilized to enhance the destructive force on the buffer sleeve 44 during over-extrusion shearing. At the same time, the silicone rubber coating effectively avoids direct contact between the metal and the cable conductor, resulting in short circuit and improving the use safety; the buffer sleeve 44 includes a limiting frame A441, and a storage bladder 442 is embedded inside the limiting frame A441. A separation strip 443 is hot-pressed and welded on the storage bladder 442 to form a plurality of adjacent solution chambers; the limiting frame A441 is in a grid shape, and both ends of the buffer sleeve 44 are connected to the sides of adjacent fixing rings 41 by hot melting, and the limiting frame A441 is made of silicone rubber; the inside of the storage bladder 442 is filled with hydroxy-terminated silicone oil, and the storage bladder 442 is made of polyimide film.

[0021] Specifically, as Figure 7As shown in the figure, the isolation strip 443 is used to form a plurality of solution chambers, so as to form a uniform and dense block reaction area around the insulating sheath 1, so as to adapt to the bending conditions of the high-voltage DC cable at different angles during use. At the same time, the buffer sleeve 44 is made of silicone rubber and polyimide materials, so that the buffer sleeve 44 as a whole has a certain elastic stretchability to meet the normal bending and stretching requirements of the cable. And the grid structure of the limiting frame A441 is used to facilitate the formation of a linear traction force between adjacent fixing rings 41 to enhance the torsional resistance of the cable and reduce the offset of the insulating sheath 1; The inner wall of the isolation sleeve 52 is fixedly provided with a limiting frame B54 at equal intervals. The opening end of the limiting frame B54 is fixedly provided with an isolation sheet 55. The powder chamber 53 is located inside the limiting frame B54. The surface of the isolation sheet 55 is provided with micropores, and the diameter of the micropores is 0.1-0.5 mm; The isolation sleeve 52, the limiting frame B54 and the isolation sheet 55 are of an integral flexible sheet structure, and the isolation sleeve 52 is adhesively bonded to the outer wall of the connecting ring 51 by hot melting; The interior of the powder chamber 53 is also filled with nano-calcium carbonate and bismuth octoate. Nano-calcium carbonate, bismuth octoate and methyltrimethoxysilane are mixed and filled in the powder chamber 53. The proportion of nano-calcium carbonate is 30%, the proportion of bismuth octoate is 0.8%, and the proportion of methyltrimethoxysilane is 69.2%.

[0022] Specifically, as Figure 8 shown in the figure, the microporous structure of the isolation sheet 55 is used to ensure that the methyltrimethoxysilane powder is stably wrapped inside the powder chamber 53. At the same time, during the reaction, it can not hinder the infiltration of the hydroxyl-terminated silicone oil inward, avoid the sudden contact between the hydroxyl-terminated silicone oil and the methyltrimethoxysilane powder and cause a violent reaction, and prevent damage to the insulating sheath 1. At the same time, nano-calcium carbonate is used as an expansion regulator to facilitate the absorption of methanol generated during the reaction to control the volume change before and after the reaction and avoid bursting the cable from the inside out. Bismuth octoate is used as a catalyst to reduce the overall reaction time; The limiting member 3 includes a clamping block 31. A clamping groove 32 is arranged inside the clamping block 31. There are three clamping blocks 31, and the clamping blocks 31 are connected by hot melting. The outer wall of the insulating sheath 1 is attached to the inner wall of the clamping groove 32.

[0023] Specifically, as Figure 6 shown in the figure, the clamping block 31 is used to limit and fix a plurality of insulating sheaths 1. And with the hot-melt connection method between the clamping block 31, the fixing ring 41 and the connecting ring 51, the spiral winding of the insulating sheath 1 can be stably limited to the innermost layer of the cable. And due to the reverse spiral effect of the special-shaped spring 43, the elastic reset of the special-shaped spring 43 is used to make the insulating sheath 1 form a stable torsional resistance, effectively avoiding the possibility of loosening of the insulating sheath 1 caused by torsion during the handling and use of the cable, improving the tightness of the insulating sheath 1 and reducing the offset.

[0024] Working principle: Through the limit member 3, the fixing ring 41, the connecting ring 51 and the outer protective sleeve 6, the insulating sheath 1 is protected layer by layer. The buffer sleeve 44 is used to form a flexible buffer isolation layer on the outside of the insulating sheath 1, reducing the impact damage to the insulating sheath 1 during the handling and use of the cable. At the same time, the reverse spiral winding of the special-shaped spring 43 makes it form mutual restraint with the insulating sheath 1 in two directions to prevent the loosening of the insulating sheath 1 when the cable twists. Moreover, the elastic effect of the special-shaped spring 43 is utilized to improve the overall bending toughness of the cable, so that the cable can adapt to the repeated bending during the movement of the dust filter, and the service life of the cable is extended. When a certain position of the cable is in an over-bent state, due to the deformation and extrusion of the special-shaped spring 43 on the inner side of the bend, the sharp edges of the special-shaped spring 43 are squeezed against each other. At the same time, due to the bend, the buffer sleeve 44 continuously approaches the deformed special-shaped spring 43, so that the serrated edge of the special-shaped spring 43 exerts a shearing action on the storage bladder 442, causing the storage bladder 442 to rupture, and the hydroxyl-terminated silicone oil inside it reacts with the methyltrimethoxysilane powder through the micropores on the isolation sheet 55 to undergo hydrolysis and condensation reaction to form a polymethylsiloxane elastomer, forming a flexible support for the over-bent position. This support enhances the structural strength of the over-bent position of the cable, thereby forming a bending resistance, weakening the bending arc of the cable and increasing the bending radius, so as to avoid repeated over-bending in this area of the cable and prevent the cable from breaking. Since this flexible support has flexibility, heat conductivity and insulation, the cable can meet normal use in the follow-up.

[0025] The technical scope of the present invention is not limited to the content described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A high-voltage DC cable for a durable dust filter, characterized in that, Including: Insulating sheaths, there are three of the insulating sheaths, electric cores are embedded inside each of the insulating sheaths, the insulating sheaths are helically wound with each other, a buffer layer is sleeved outside the insulating sheaths, limiting members are fixedly arranged at equal intervals between the buffer layer and the insulating sheaths, a reaction layer is sleeved outside the buffer layer, and an outer protective sleeve is sleeved outside the reaction layer; the buffer layer includes fixing rings, a special-shaped spring is wound and connected between the outer walls of adjacent fixing rings, the spiral direction of the special-shaped spring is opposite to the spiral direction of the insulating sheath, a buffer sleeve is fixedly connected between adjacent fixing rings, hydroxy-terminated silicone oil is filled inside the buffer sleeve, the buffer sleeve is located inside the special-shaped spring, the cross-section of the special-shaped spring is an obtuse triangle, the obtuse edge of the special-shaped spring faces the insulating sheath, the obtuse edge of the special-shaped spring is provided with a rounded corner, and the spiral edge formed by the acute angles of the special-shaped spring is serrated; the reaction layer includes a connecting ring fixedly sleeved on the outer wall of the fixing ring, an isolation sleeve is fixedly sleeved on the outer wall of the connecting ring, a powder bin is arranged on the inner wall of the isolation sleeve, and methyltrimethoxysilane powder is filled inside the powder bin.

2. The high-voltage DC cable for a durable dust filter according to claim 1, characterized in that: Chute grooves are equidistantly opened on the outer wall of the fixing ring, and the special-shaped spring is embedded into the chute grooves and wound around the outer wall of the fixing ring.

3. The high-voltage DC cable for a durable dust filter according to claim 1, wherein: The special-shaped spring is made of stainless steel, the serrated edge of the acute-angle spiral edge of the special-shaped spring exposes the metal part, and the surfaces of the rest of the special-shaped spring are coated with a silicone rubber coating.

4. The high-voltage DC cable for a durable dust filter according to claim 1, wherein: The buffer sleeve includes a limiting frame A, a storage bladder is embedded inside the limiting frame A, and isolation strips are hot-pressed and welded on the storage bladder to form a plurality of adjacent solution bins.

5. The high-voltage DC cable for a durable dust filter according to claim 4, characterized in that: The limiting frame A is in a grid shape, both ends of the buffer sleeve are thermally melted and connected to the sides of adjacent fixing rings, and the limiting frame A is made of silicone rubber.

6. The high-voltage DC cable for a durable dust filter according to claim 4, wherein: Hydroxy-terminated silicone oil is filled inside the storage bladder, and the storage bladder is made of polyimide film.

7. The high-voltage DC cable for a durable dust filter according to claim 1, characterized in that: Limiting frames B are equidistantly fixed on the inner wall of the isolation sleeve, isolation sheets are fixed at the open ends of the limiting frames B, the powder bin is located inside the limiting frames B, micropores are arranged on the surface of the isolation sheet, and the diameter of the micropores is 0.1 - 0.5 mm.

8. The high-voltage DC cable for a durable dust filter according to claim 7, characterized in that: The isolation sleeve, the limiting frame B and the isolation sheet are an integral flexible sheet structure, and the isolation sleeve is adhesively wrapped and bonded to the outer wall of the connecting ring by thermal melting.

9. The high-voltage DC cable for a durable dust filter according to claim 1, characterized in that: Nano calcium carbonate and bismuth octoate are also filled inside the powder bin, the nano calcium carbonate, bismuth octoate and methyltrimethoxysilane are mixed and filled in the powder bin, the proportion of nano calcium carbonate is 30%, the proportion of bismuth octoate is 0.8%, and the proportion of methyltrimethoxysilane is 69.2%.

10. The high-voltage DC cable for a durable dust filter according to claim 1, characterized in that: The limiting member includes a clamping block, a clamping groove is arranged inside the clamping block, there are three clamping blocks, the clamping blocks are thermally melted and connected between them, and the outer wall of the insulating sheath fits with the inner wall of the clamping groove.

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