A durable high-voltage DC cable for dust filters

Abstract

The present invention proposes a durable high-voltage DC cable for dust filters, which belongs to the field of cable technology and includes: an insulating sheath, wherein three insulating sheaths are provided, each of which has a core embedded therein, the insulating sheaths are spirally wound around each other, a buffer layer is provided on the outside of the insulating sheath, and a reaction layer is provided on the outside of the buffer layer. The present invention enhances the bending tensile toughness and bending and fracture resistance of the cable by means of a special-shaped spring with a spiral winding of the insulating sheath and an external reverse spiral, thereby meeting the irregular bending requirements of the dust filter during mobile use. When the cable is excessively bent, the inside of the special-shaped spring is squeezed, and its special cross-section forms a shear force, causing the buffer sheath to rupture. The material flowing out of the buffer sheath undergoes a room-temperature silane cross-linking reaction with the powder of the reaction layer, forming a flexible support point at the bending point, thereby avoiding excessive bending of the cable and preventing the insulating sheath from rupturing. The support point is self-starting and self-positioning, thereby ensuring the service life of the dust filter.

Description

Technical Field

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

[0002] Durable high-voltage DC cable for dust filters is a cable specially used for dust filter equipment and transmitting high-voltage DC power. It is mainly used in 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, it transmits power to the dust filter equipment in the DC 75kV and below distribution circuit, so that the dust filter maintains an electrostatic field sufficient to ionize the gas through the high-voltage DC power, realizes the separation of dust and gas, and achieves the dust removal effect; Chinese patent authorization announcement CN215527298U discloses a reel cable structure, including a mounting sleeve, in which three brackets are fixedly installed. One end of the three brackets is fixedly connected to the inner wall of the mounting sleeve, and the other end is fixedly connected to each other. It is used to solve the problem that the existing reel cable is prone to cell displacement after a period of use. As the cable is reeled, the cell is more likely to be dislocated, which makes the cable more likely to break, thereby shortening the service life of the reel cable and increasing the cost of use;

[0003] The above-mentioned existing technical solutions have the following shortcomings: since the use of cables in the telescopic parts of the dust filter, such as robotic arms and lifting mechanisms, requires frequent irregular bending, and the existing cables have a relatively simple external structure of the battery cells, they need to utilize the toughness of the external protective layer material to meet the bending needs of the cables, but the battery cells are generally made of copper wire. When the bending curvature is too large, the battery cell structure is not easy to change, so it is easy for the battery cell to break. Therefore, there is room for improvement. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that it is difficult in the prior art to provide fixed-point support and reinforcement according to the bending points of the cable during use. The present invention proposes a durable high-voltage DC cable for a dust filter.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a durable high-voltage DC cable for dust filters, comprising: an insulating sheath, three insulating sheaths are provided, the interiors of the insulating sheaths are embedded with electric cores, the insulating sheaths are spirally wound with each other, a buffer layer is provided on the outer side of the insulating sheath, a limiting member is fixed equidistantly between the buffer layer and the insulating sheath, a reaction layer is provided on the outer side of the buffer layer, and an outer protective sheath is provided on the outer side of the reaction layer; the buffer layer includes a fixing ring, and a special-shaped spring is wound and connected between the outer walls of adjacent fixing rings, and the spiral direction of the special-shaped spring is consistent with the insulating sheath The spiral directions are opposite, and a buffer sleeve is fixedly connected between adjacent fixing rings. The interior of the buffer sleeve is filled with hydroxyl-terminated silicone oil. The buffer sleeve is located on the inner side of 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 rounded, and the spiral edge formed by the acute angle of the special-shaped spring is serrated; the reaction layer includes a connecting ring fixedly sleeved on the outer wall of the fixing ring, and the outer wall of the connecting ring is provided with an isolation sleeve. The inner wall of the isolation sleeve is provided with a powder bin, and the interior of the powder bin is filled with methyltrimethoxysilane powder.

[0006] Preferably, the outer wall of the fixing ring is provided with sliding grooves at equal intervals, and the special-shaped springs are embedded in the sliding grooves and wound around the outer wall of the fixing ring.

[0007] Preferably, the special-shaped spring is made of stainless steel, the serrated edges of the sharp-angled spiral edge of the special-shaped spring are exposed to the metal part, and the rest of the special-shaped spring surface is coated with a silicone rubber coating.

[0008] Preferably, the buffer sleeve includes a limiting frame A, a storage capsule is embedded in the limiting frame A, and isolation strips are hot-pressed and welded on the storage capsule to form a plurality of adjacent solution tanks.

[0009] Preferably, the limiting frame A is in a grid shape, and both ends of the buffer sleeve are connected to the sides of the adjacent fixing rings by hot melting. The limiting frame A is made of silicone rubber.

[0010] Preferably, the interior of the storage capsule is filled with hydroxyl-terminated silicone oil, and the storage capsule is made of a polyimide film.

[0011] Preferably, a limit frame B is fixed equidistantly on the inner wall of the isolation sleeve, an isolation sheet is fixed on the open end of the limit frame B, the powder bin is located inside the limit frame B, and micropores are provided on the surface of the isolation sheet with a diameter of 0.1-0.5 mm.

[0012] Preferably, the isolation sleeve, the limiting frame B and the isolation sheet are an integrated flexible sheet structure, and the isolation sleeve is bonded to the outer wall of the connecting ring by hot-melt wrapping.

[0013] 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, with nano-calcium carbonate accounting for 30%, bismuth octoate accounting for 0.8%, and methyltrimethoxysilane accounting for 69.2%.

[0014] Preferably, the limiting member includes a card block, a card slot is provided on the inner side of the card block, and there are three card blocks. The card blocks are hot-melt connected to each other, and the outer wall of the insulating sheath is fitted with the inner wall of the card slot.

[0015] Compared with the prior art, the beneficial effects of the present invention include: improving the bending tensile toughness of the entire high-voltage DC cable itself through the spiral winding between the insulating sheaths and the external reverse spiral special-shaped spring, and at the same time utilizing the elastic resettability of the special-shaped spring to improve the bending and fracture resistance of the high-voltage DC cable, thereby meeting the irregular repeated bending needs of the high-voltage DC cable during the mobile use of the dust filter, and at the same time utilizing the deformation of the special-shaped spring itself during bending to squeeze the inner side of the bend, and cooperating with the cross-sectional structural characteristics of the special-shaped spring to form a shear force to cause the buffer sleeve to rupture, and then cooperating with the reaction layer, utilizing the room temperature silane cross-linking reaction to form a flexible support point at the bending point between the buffer layer and the reaction layer, thereby improving the bending resistance of the cable at this position, avoiding the position from being in an excessive bending state for a long time, preventing the insulating sheath from bending and breaking, and ensuring the operating service life of the dust filter. Since the formation of the support point is affected by the bending use state of the cable, self-starting and self-positioning effects are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the accompanying drawings, the same reference numerals are used to refer to the same components. Among them: Figure 1 Schematically shows a three-dimensional structural diagram proposed according to one embodiment of the present invention; Figure 2 Schematically shows a schematic diagram of a cross-sectional three-dimensional structure of a reaction layer proposed according to one embodiment of the present invention; Figure 3 Schematically shows a schematic diagram of the cross-sectional structure of a special-shaped spring proposed according to one embodiment of the present invention; Figure 4 Schematically shows a schematic diagram of a three-dimensional structure of a special-shaped spring distribution proposed according to an embodiment of the present invention; Figure 5 Schematically shows a method according to an embodiment of the present invention. Figure 2 Schematic diagram of the three-dimensional structure at A in the middle; Figure 6 A schematic diagram of the three-dimensional structure of a position limiting member according to an embodiment of the present invention is shown; Figure 7 Schematically shows a schematic diagram of the unfolded three-dimensional structure of the buffer sleeve proposed in one embodiment of the present invention; Figure 8The figure schematically shows the expanded three-dimensional structure of the isolation sleeve according to one embodiment of the present invention.

[0017] Numbers in the figure: 1. Insulating sheath; 2. Battery cell; 3. Limiting piece; 31. Block; 32. Slot; 4. Buffer layer; 41. Fixing ring; 42. Slide groove; 43. Special-shaped spring; 44. Buffer sleeve; 441. Limiting frame A; 442. Storage capsule; 443. Isolation strip; 5. Reaction layer; 51. Connecting ring; 52. Isolation sleeve; 53. Powder bin; 54. Limiting frame B; 55. Isolation piece; 6. Outer protective sleeve. DETAILED DESCRIPTION

[0018] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0019] In order to solve the problem that it is difficult to provide fixed-point support and reinforcement according to the bending points of the cable during use in the prior art, the following solution is disclosed. Figures 1-8 As shown: A durable high-voltage DC cable for dust filters, comprising: an insulating sheath 1, three insulating sheaths 1 are provided, each of which is embedded with a battery core 2, the insulating sheaths 1 are spirally wound with each other, a buffer layer 4 is provided on the outside of the insulating sheath 1, a limiting member 3 is fixed equidistantly between the buffer layer 4 and the insulating sheath 1, a reaction layer 5 is provided on the outside of the buffer layer 4, and an outer protective sheath 6 is provided on the outside of the reaction layer 5; the buffer layer 4 includes a fixing ring 41, and a special-shaped spring 43 is wound and connected between the outer walls of adjacent fixing rings 41, and the spiral direction of the special-shaped spring 43 is opposite to the spiral direction of the insulating sheath 1, and the adjacent fixing rings 4 are connected. 1 is fixedly connected with a buffer sleeve 44, the interior of the buffer sleeve 44 is filled with hydroxyl-terminated silicone oil, the buffer sleeve 44 is located on the inner side of 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 rounded, and the spiral edge formed by the acute angle 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, the outer wall of the connecting ring 51 is fixedly sleeved with an isolation sleeve 52, the inner wall of the isolation sleeve 52 is provided with a powder bin 53, and the interior of the powder bin 53 is filled with methyltrimethoxysilane powder.

[0020] Specifically, such as Figures 1-4As shown, the bending deformation of the special-shaped spring 43 when the cable is bent is used to reduce the gap between the inner sharp-angled spiral edges, and the degree of extrusion between the buffer sleeves 44 on the inner side of the bend is increased due to the bending of the cable, so that the deformation is gradually approached to 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 on the edge, thereby forming a shearing effect on the buffer sleeve 44, causing the hydroxyl-terminated silicone oil and methyltrimethoxysilane powder in the excessively bent part to contact, causing a hydrolysis condensation reaction, and causing the reaction layer 5 to form a flexible solidified body within 30 minutes, thereby forming a flexible support for the excessively bent position of the cable to resist It can resist the bending stress of the cable, reduce the pressure and excessive bending of the insulating sheath 1, and prevent breakage. Conventional extrusion methods (such as compression and rupture of elastomers) may be triggered by slight bending or vibration, while the spring cutting mechanism can achieve precise triggering through geometric shape and mechanical threshold, avoiding false operation during normal bending, achieving spontaneity and self-starting effect. Moreover, the silicone rubber elastomer formed by the reaction has its own elastic effect and will not affect the flexion and extension movement of the cable during subsequent use. That is, the over-bending position generated during the use of the cable is self-supported through the reaction to prevent frequent over-bending of the cable at this position and prevent the insulating sheath 1 from breaking.

[0021] The outer wall of the fixing ring 41 is provided with slidable grooves 42 at equal intervals, and the special-shaped springs 43 are embedded in the slidable grooves 42 and wound around the outer wall of the fixing ring 41; the special-shaped springs 43 are made of stainless steel, and the serrated edges of the sharp-angled spiral edges of the special-shaped springs 43 are exposed to the metal part, and the rest of the surfaces of the special-shaped springs 43 are coated with a silicone rubber coating; specifically, Figure 3-Figure 5 As shown, the slide groove 42 is used to limit the special-shaped spring 43, thereby ensuring that the obtuse edge of the special-shaped spring 43 faces inward to prevent the sharp edge from facing inward. In addition, the obtuse angle design ensures that when the cable is bent, the buffer sleeve 44 will not directly contact the sharp edge when it expands outward due to normal deformation on the bending side, thereby reducing the probability of miscutting. The serrated structure of the sharp-angled spiral edge of the special-shaped spring 43 is used to enhance the destructive force on the buffer sleeve 44 during excessive extrusion and shearing. At the same time, the silicone rubber coating effectively prevents the metal from contacting the cable conductor. The buffer sleeve 44 does not cause a short circuit due to direct contact with the body, thereby improving safety in use; the buffer sleeve 44 includes a limit frame A441, a storage capsule 442 is embedded in the limit frame A441, and an isolation strip 443 is hot-pressed and welded on the storage capsule 442 to form a plurality of adjacent solution chambers; the limit frame A441 is in a grid shape, and the two ends of the buffer sleeve 44 are connected to the side of the adjacent fixing ring 41 by hot melting, and the limit frame A441 is made of silicone rubber; the interior of the storage capsule 442 is filled with hydroxyl-terminated silicone oil, and the storage capsule 442 is made of polyimide film.

[0022] Specifically, such as Figure 7As shown, the isolation strips 443 are used to form multiple solution chambers, so that the periphery of the insulating sheath 1 forms a uniform and dense block reaction area, which can adapt to the bending conditions of the high-voltage DC cable at different angles in use. At the same time, silicone rubber and polyimide materials are used to make the buffer sleeve 44 as a whole have a certain elastic stretchability to meet the normal bending and stretching requirements of the cable, and the grid structure of the limit frame A441 is used to form a linear traction force between adjacent fixing rings 41 to enhance the torsional resistance of the cable and reduce the deviation of the insulating sheath 1; the inner wall of the isolation sleeve 52 is equidistantly fixed with a limit frame B54, which limits An isolation piece 55 is fixed to the open end of the frame B54, and the powder bin 53 is located inside the limit frame B54. Micropores are provided on the surface of the isolation piece 55, and the diameter of the micropores is 0.1-0.5 mm; the isolation sleeve 52, the limit frame B54 and the isolation piece 55 are an integrated flexible sheet structure, and the isolation sleeve 52 is bonded to the outer wall of the connecting ring 51 by hot-melt wrapping; the interior of the powder bin 53 is also filled with nano-calcium carbonate and bismuth octylate. Nano-calcium carbonate, bismuth octylate and methyltrimethoxysilane are mixed and filled in the powder bin 53, with nano-calcium carbonate accounting for 30%, bismuth octylate accounting for 0.8%, and methyltrimethoxysilane accounting for 69.2%.

[0023] Specifically, such as Figure 8 As shown, the microporous structure of the isolation sheet 55 is utilized to ensure that the methyltrimethoxysilane powder is stably wrapped inside the powder bin 53, while at the same time not hindering the infiltration of the hydroxyl-terminated silicone oil into the inside during the reaction, avoiding sudden contact and violent reaction between the hydroxyl-terminated silicone oil and the methyltrimethoxysilane powder, and preventing damage to the insulating sheath 1. At the same time, nano-calcium carbonate is utilized as an expansion regulator to facilitate the absorption of the methanol generated during the reaction, so as to regulate the volume change before and after the reaction and avoid bursting the cable from the inside out, and bismuth octanoate is utilized as a catalyst to reduce the overall reaction time; the limiter 3 includes a card block 31, and a card slot 32 is provided on the inner side of the card block 31. The card block 31 is provided with three cards, and the card blocks 31 are hot-melt connected to each other, and the outer wall of the insulating sheath 1 is fitted with the inner wall of the card slot 32.

[0024] Specifically, such as Figure 6 As shown, a plurality of insulating sheaths 1 are limited and fixed by using a clamping block 31, and the hot-melt connection between the clamping block 31, the fixing ring 41, and the connecting ring 51 is coordinated so that the spiral winding of the insulating sheath 1 can be stably limited to the innermost layer of the cable. Moreover, due to the reverse spiral effect of the special-shaped spring 43, the elastic reset of the special-shaped spring 43 is utilized to form a stable torsional resistance for the insulating sheath 1, effectively avoiding the possibility of loosening of the insulating sheath 1 caused by twisting of the cable during transportation and use, thereby improving the tightness of the insulating sheath 1 and reducing deviation.

[0025] Working principle: The insulating sheath 1 is protected layer by layer through the limiter 3, the fixing ring 41, the connecting ring 51 and the outer protective sleeve 6, and the buffer sleeve 44 is used to form a flexible buffer isolation layer on the outside of the insulating sheath 1 to reduce the impact damage to the insulating sheath 1 during the transportation and use of the cable. At the same time, the reverse spiral winding of the special-shaped spring 43 is used to form mutual restraint in two directions with the insulating sheath 1 to prevent the loosening of the insulating sheath 1 when the cable is twisted, and the elastic effect of the special-shaped spring 43 is used to improve the overall bending toughness of the cable, so that the cable can adapt to the repeated bending when the dust filter is moved and used, thereby improving the service life of the cable; when a certain position of the cable is in an over-bending state, due to the deformation and extrusion of the special-shaped spring 43 on the inner side of the bend, the special-shaped spring 43 is compressed. The sharp edges of the buffer sleeve 44 are squeezed against each other, and due to the bending, the buffer sleeve 44 is continuously deformed and moved closer to the special-shaped spring 43, so that the serrated edge of the special-shaped spring 43 forms a shearing effect on the storage capsule 442, causing the storage capsule 442 to rupture, and the hydroxyl-terminated silicone oil inside it to undergo a hydrolysis and condensation reaction with the micropores and methyltrimethoxysilane powder on the isolation sheet 55 to form a polymethylsiloxane elastomer, which forms a flexible support body for the excessive bending position. The support body enhances the structural strength of the cable at the excessive bending position, thereby forming a bending resistance, reducing the bending curvature of the cable and increasing the bending radius, thereby avoiding repeated over-bending of the cable in this area and preventing the cable from breaking. Since the flexible support body has flexibility, thermal conductivity and insulation, the cable can meet normal use in the future.

[0026] The technical scope of the present invention is not limited to the contents of the above description. 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 durable high-voltage DC cable for dust filter, characterized in that: include: Insulating sheath, three of which are provided, wherein the inside of each insulating sheath is embedded with a battery core, the insulating sheaths are spirally wound with each other, a buffer layer is provided on the outside of the insulating sheath, a limiting member is fixed equidistantly between the buffer layer and the insulating sheath, a reaction layer is provided on the outside of the buffer layer, and an outer protective sheath is provided on the outside of the reaction layer; the buffer layer includes a fixing ring, and a special-shaped spring is wound and connected between the outer walls of adjacent fixing rings, and the spiral direction of the special-shaped spring is opposite to the spiral direction of the insulating sheath, and the adjacent fixing rings are fixedly connected There is a buffer sleeve, the interior of the buffer sleeve is filled with hydroxyl-terminated silicone oil, the buffer sleeve is located on the inner side of 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 sleeve, the obtuse edge of the special-shaped spring is rounded, and the spiral edge formed by the acute angle of the special-shaped spring is serrated; the reaction layer includes a connecting ring fixedly mounted on the outer wall of the fixing ring, the outer wall fixed sleeve of the connecting ring is provided with an isolation sleeve, the inner wall of the isolation sleeve is provided with a powder bin, and the interior of the powder bin is filled with methyltrimethoxysilane powder.

2. The durable high-voltage DC cable for dust filter according to claim 1, characterized in that: The outer wall of the fixing ring is provided with sliding grooves at equal intervals, and the special-shaped spring is embedded in the sliding grooves and wound around the outer wall of the fixing ring.

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

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

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

6. The durable high-voltage DC cable for dust filter according to claim 4, characterized in that: The interior of the storage capsule is filled with hydroxyl-terminated silicone oil, and the storage capsule is made of a polyimide film.

7. The durable high-voltage DC cable for dust filter according to claim 1, characterized in that: A limit frame B is fixed equidistantly on the inner wall of the isolation sleeve, an isolation sheet is fixed on the open end of the limit frame B, the powder bin is located inside the limit frame B, micropores are provided on the surface of the isolation sheet, and the diameter of the micropores is 0.1-0.5 mm.

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

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

10. The durable high-voltage DC cable for dust filter according to claim 1, characterized in that: The limiting member includes a card block, the inner side of which is provided with a card slot, and three card blocks are provided. The card blocks are hot-melt connected to each other, and the outer wall of the insulating sheath is fitted with the inner wall of the card slot.

Images