Water-blocking aluminum alloy core low-voltage power cable for photovoltaic power generation system and preparation method of water-blocking aluminum alloy core low-voltage power cable

Abstract

The invention discloses a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system and a preparation method of the water-blocking aluminum alloy core low-voltage power cable, and particularly relates to the technical field of power cables.The water-blocking aluminum alloy core low-voltage power cable comprises a special-shaped aluminum alloy conductor wire core set formed through twisting, and a water-tree-resistant insulating layer is extruded on the outer side of the special-shaped aluminum alloy conductor wire core set; wherein the plurality of water-tree-resistant insulating layers are arranged in a circular array, and the aluminum-plastic composite tape, the polyethylene lining layer, the armored steel tape and the weather-resistant polyethylene outer protective layer are sequentially arranged from inside to outside according to the axis of the circular array arrangement of the water-tree-resistant insulating layers. According to the power cable provided by the invention, radial and longitudinal water blocking is carried out on the power cable through the water-blocking glue layer and the water-blocking filling layer, and meanwhile, the structural strength, water blocking and weather resistance of the power cable are improved through cooperation of the aluminum-plastic composite belt, the polyethylene lining layer, the armored steel belt and the weather-resistant polyethylene outer protective layer; therefore, water trees are reduced, and the service life of the power cable is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and particularly to a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system and a preparation method thereof. Background Art

[0002] Photovoltaic power generation systems are usually exposed to harsh outdoor environments, such as high humidity, ultraviolet rays, ozone, acid-base corrosion, etc. Therefore, in order to ensure the stable operation of photovoltaic power generation systems, extremely high requirements are imposed on the performance of cables.

[0003] According to Chinese Patent Publication No. CN113628805B, Publication Date: March 31, 2023, there is disclosed an aluminum alloy conductor cross-linked polyethylene insulated interlocking armor flame-retardant power cable, including a core, the core includes an aluminum alloy conductor, an insulating layer is extruded outside the aluminum alloy conductor, a filling layer is filled between the cores, a wrapping layer is arranged outside the filling layer, a lining layer is extruded outside the wrapping layer, an interlocking armor layer is covered outside the lining layer, and an outer sheath is arranged outside the interlocking armor layer.

[0004] In the prior art including the above patent, cross-linked polyethylene is used as the insulating layer to achieve an effective insulating effect, and a flame retardant added to the outer sheath enables the power cable to achieve an effective flame retardant effect. For such a commonly used power cable, it has relatively excellent effects in both insulation and flame retardancy. However, when used in power cables of photovoltaic power generation systems, due to the influence of the use environment, the following problems will exist: only relying on the outer sheath for waterproofing, lacking a longitudinal water-blocking design, and water vapor is easy to penetrate along the conductor gaps; ordinary insulating layer and outer sheath materials are prone to aging and cracking under ultraviolet rays and ozone, and the service life is less than 20 years; conventional cross-linked polyethylene is prone to water treeing in a humid environment, resulting in insulation breakdown. Summary of the Invention

[0005] The purpose of the present invention is to provide a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system and a preparation method thereof to solve the above technical problems.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system, including a stranded special-shaped aluminum alloy conductor core group, an anti-water tree insulating layer is extruded outside the special-shaped aluminum alloy conductor core group, wherein: A plurality of anti-water tree insulating layers are arranged in a circular array, and an aluminum-plastic composite tape, a polyethylene lining layer, an armor steel tape, and a weather-resistant polyethylene outer sheath are arranged in sequence from the inside to the outside along the axis of the circular array of the anti-water tree insulating layers; A water-blocking filling layer is filled between the plurality of anti-water tree insulating layers inside the aluminum-plastic composite tape, and a water-blocking glue layer is filled between the anti-water tree insulating layers located between the special-shaped aluminum alloy conductor core groups.

[0007] Preferably, the shaped aluminum alloy conductor wire core group includes core single wires and a plurality of winding single wires stranded outside the core single wires.

[0008] A method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system, which is used to realize that a water-blocking glue layer is filled between the shaped aluminum alloy conductor wire core groups in the water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system described in the above solution, includes a stranding table with a tapered opening; During the process of conveying the core single wires and the plurality of winding single wires from the wide end to the narrow end of the tapered opening, the plurality of winding single wires are attached to the inner wall of the tapered opening; The inner wall of the tapered opening is provided with a plurality of glue discharge grooves for discharging the water-blocking glue.

[0009] Preferably, the stranding table is provided with a bunching wire channel and a shaping wire channel which are sequentially distributed at the narrow end of the tapered opening.

[0010] Preferably, there is a glue storage cavity communicating with both of them between the bunching wire channel and the shaping wire channel, and there is an extrusion tapered opening between the glue storage cavity and the shaping wire channel; The circumferential radius of the narrow end of the extrusion tapered opening is equal to the circumferential radius of the shaping wire channel.

[0011] Preferably, the inner wall of the extrusion tapered opening is provided with spray glue openings distributed in a circumferential array.

[0012] Preferably, an annular compensation groove is arranged at one end of the shaping wire channel opposite to the extrusion tapered opening.

[0013] Preferably, an elastic plate inclined and extending to the outside of the groove opening is fixedly installed on the inner wall of the glue discharge groove, and the elastic plate is swept and moved by the winding single wire during the movement, so that the elastic plate moves towards the inside of the glue discharge groove to extrude the water-blocking glue.

[0014] Preferably, it further includes a liquid storage groove, and the winding single wire moves and sweeps through the glue discharge groove and the liquid storage groove in sequence.

[0015] Preferably, the upper surface of the low-position plate fixedly installed at the end of the elastic plate is lower than the upper surface of the elastic plate.

[0016] In the above technical solution, a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system and a preparation method thereof provided by the present invention have the following beneficial effects: By utilizing the water-blocking glue layer on the special-shaped aluminum alloy conductor wire core group and the water-blocking filling layer filled between multiple water-tree-resistant insulating layers, radial water-blocking of the power cable by the water-blocking filling layer and longitudinal water-blocking by the water-blocking glue layer are realized. At the same time, in cooperation with the aluminum-plastic composite tape, the polyethylene inner lining layer, the armored steel tape, and the weather-resistant polyethylene outer sheath layer, the structural strength, water-blocking property, and weather resistance of the power cable are improved, thereby reducing the generation of water trees and enhancing the service life of the power cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0018] Figure 1 Schematic diagram of the overall cross-sectional structure of the power cable provided by the embodiment of the present invention; Figure 2 Schematic diagram of the overall structure of the stranding table provided by the embodiment of the present invention; Figure 3 Schematic diagram of a partial structure of the stranding table provided by the embodiment of the present invention; Figure 4 Schematic diagram of the cross-sectional structure of the stranding table provided by the embodiment of the present invention; Figure 5 Schematic diagram of the structure of the special-shaped aluminum alloy conductor wire core group provided by the embodiment of the present invention; Figure 6 Schematic diagram of the cross-sectional structure of the tapered opening provided by the embodiment of the present invention; Figure 7 Schematic diagram of a partial cross-sectional structure of the tapered opening provided by the embodiment of the present invention; Figure 8 Schematic diagram of a partial cross-sectional structure of the stranding table provided by the embodiment of the present invention; Figure 9 provided by the embodiment of the present invention Figure 4 Enlarged structure diagram at position A; Figure 10 provided by the embodiment of the present invention Figure 4 Enlarged structure diagram at position B; Figure 11 provided by the embodiment of the present invention Figure 6 Enlarged structure diagram at position C; Figure 12 provided by the embodiment of the present invention Figure 7 Enlarged structure diagram at position D.

[0019] Description of the reference numerals: 1. Weather-resistant polyethylene outer sheath; 2. Stranding table; 3. Ring; 4. Core monofilament; 5. Elastic plate; 6. Airbag; 11. Armoring steel strip; 12. Polyethylene inner liner; 13. Aluminum-plastic composite tape; 14. Water-blocking filling layer; 15. Anti-water-tree insulation layer; 16. Water-blocking glue layer; 21. Tapered opening; 22. Glue injection pipe; 23. Front recovery tank; 24. Collection chamber; 25. Rear recovery tank; 26. Drain pipe; 27. Strand channel; 28. Shaping wire channel; 31. Compensation channel; 32. Annular compensation groove; 33. Glue spraying port; 34. Extrusion tapered opening; 35. Glue storage chamber; 36. Flow channel; 37. Glue discharge groove; 38. Flow chamber; 39. Liquid storage groove; 41. Winding monofilament; 42. Large angle; 43. Small angle; 44. Finished state; 51. Lower plate; 52. Upper plate; 53. Lower plate; 61. Opening part. Detailed implementation manners

[0020] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure. Embodiment

[0021] A water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system includes a stranded special-shaped aluminum alloy conductor core group, and an anti-water-tree insulation layer 15 is extruded outside the special-shaped aluminum alloy conductor core group, wherein: A plurality of anti-water-tree insulation layers 15 are arranged in a circular array, and an aluminum-plastic composite tape 13, a polyethylene inner liner 12, an armoring steel strip 11 and a weather-resistant polyethylene outer sheath 1 are sequentially arranged from the inside to the outside according to the axis of the circular array arrangement of the anti-water-tree insulation layers 15. A water-blocking filling layer 14 is filled between the plurality of anti-water-tree insulation layers 15 inside the aluminum-plastic composite tape 13, and a water-blocking glue layer 16 is filled between the anti-water-tree insulation layers 15 located between the special-shaped aluminum alloy conductor core groups.

[0022] Specifically, as Figure 1 shown, the special-shaped aluminum alloy conductor core group is stranded by using a stranding machine, and a hot-melt water-blocking glue is evenly coated on the surface of the stranded special-shaped aluminum alloy conductor core group by using a water-blocking glue filling machine to form a water-blocking filling layer 14. The water-blocking glue uses a modified polyurethane resin, and the viscosity of the water-blocking glue is 5000 cps.

[0023] Then, an extruder is used to extrude the water-tree resistant insulating layer 15 onto the profiled aluminum alloy conductor wire core group after filling with glue. At this time, the filling coefficient of the profiled aluminum alloy conductor wire core group in the water-tree resistant insulating layer 15 is ≥95%. The profiled aluminum alloy conductor wire core group uses trapezoidal aluminum alloy single wires, and the stranding pitch ratio is 12 - 15 times.

[0024] The water-tree resistant insulating layer 15 uses water-tree resistant cross-linked polyethylene with a thickness of 2.0 mm. Nano-scale silica and a water-tree inhibitor (such as polyethylene glycol derivatives) are added. The cross-linking process is adopted: after extrusion, it is cross-linked by electron beam irradiation to ensure that the cross-linking degree is ≥85% and the thermal elongation is ≤50%.

[0025] The water-blocking filling layer 14 is a water-blocking yarn made of superabsorbent polymer fibers. An automated device is used to evenly and tightly wrap the water-blocking yarn around the outside of multiple water-tree resistant insulating layers 15, thereby achieving the effect of preventing water intrusion into the power cable.

[0026] Then, a wrapping machine is used to wrap an aluminum-plastic composite tape 13 (the wrapping thickness is ≥0.15 mm) around the outside of multiple water-tree resistant insulating layers 15. In the wrapped aluminum-plastic composite tape 13 (the aluminum layer thickness is 20 μm).

[0027] After wrapping the aluminum-plastic composite tape 13, an extruder device is used again to extrude a polyethylene inner lining layer 12 containing water-blocking carbon black onto the aluminum-plastic composite tape 13. Then, an armored wrapping machine is used to wrap an armored steel tape 11 around the polyethylene inner lining layer 12.

[0028] The weather-resistant polyethylene outer sheath 1 contains 2% benzotriazole as an ultraviolet absorber, 1% nano-montmorillonite as an acid and alkali resistant filler, and 2.5% p-phenylenediamine as an anti-ozone agent. The surface of the weather-resistant polyethylene outer sheath 1 is treated by ultraviolet curing to form a dense protective layer, and at the same time, the thickness of the weather-resistant polyethylene outer sheath 1 is ≥1.8 mm.

[0029] Therefore, through trapezoidal aluminum alloy single wires, water-blocking glue, and water-blocking yarn, the integration of high conductivity, longitudinal water-blocking of the water-blocking glue, and radial water-blocking of the water-blocking yarn is achieved. The water-tree resistant insulating layer 15 uses water-tree resistant cross-linked polyethylene in combination with the aluminum-plastic composite tape 13 to achieve water-tree resistance and radial water-blocking. By using the weather-resistant polyethylene outer sheath 1 and the protective armored steel tape 11, the weather resistance and protective strength of the cable can be effectively improved, and thus the power cable can be better applied to high-humidity, ultraviolet, ozone, acid-base corrosion environments, etc. in the photovoltaic power generation system.

[0030] In the above technical solution, by utilizing the water-blocking glue layer 16 on the special-shaped aluminum alloy conductor wire core group and the water-blocking filling layer 14 filled between multiple water-tree-resistant insulation layers 15, the radial water-blocking of the power cable by the water-blocking filling layer 14 and the water-blocking of the longitudinal water-blocking glue layer 16 are realized. At the same time, the aluminum-plastic composite tape 13, the polyethylene inner lining layer 12, the armor steel tape 11 and the weather-resistant polyethylene outer sheath 1 are coordinated to enhance the structural strength, water-blocking and weather resistance of the power cable, thereby reducing the generation of water trees and enhancing the service life of the power cable.

[0031] As a further embodiment provided by the present invention, the special-shaped aluminum alloy conductor wire core group includes a core single wire 4 and a plurality of winding single wires 41 stranded outside the core single wire 4.

[0032] Specifically, by using the core single wire 4 as the stable axis wire core of the special-shaped aluminum alloy conductor wire core group, and coordinating a plurality of winding single wires 41 to be stranded on the core single wire 4 with the core single wire 4 as the axis, the entire stranded structure can better withstand pressure and tension, reducing the risk of wear and fracture. At the same time, it can effectively reduce deformation when an external force is applied. With the core single wire 4 as the axis and a plurality of winding single wires 41 stranded on the core single wire 4, the problem of air or moisture being entrapped in the power cable to form air bubbles can be reduced. At this time, when applying water-blocking glue to the special-shaped aluminum alloy conductor wire core group from the outside, the water-blocking glue can directly fill the gap between the winding single wire 41 and the core single wire 4. Compared with a power cable with a dispersed stranding, when applying water-blocking glue to it, there will be air or moisture inside the power cable with a dispersed stranding, which will then be trapped in the glue layer during the coating process, forming air bubbles, resulting in a decrease in the longitudinal water-blocking effect of the power cable. The number of winding single wires 41 in one water-tree-resistant insulation layer 15 is six, and the core single wire 4 is one. Embodiment

[0033] As Figures 1 - 12 shown, a preparation method of a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system includes a stranding table 2 having a tapered opening 21; During the process of transporting the core single wire 4 and a plurality of winding single wires 41 from the wide end to the narrow end of the tapered opening 21, the plurality of winding single wires 41 are attached to the inner wall of the tapered opening 21; A plurality of glue discharge grooves 37 for discharging water-blocking glue are provided on the inner wall of the tapered opening 21.

[0034] Specifically, multiple glue discharging grooves 37 are arranged in a circular array around the axis of the conical opening 21. The heated water-blocking glue is pumped into the multiple glue discharging grooves 37 by a water-blocking glue filling machine, and then the water-blocking glue flows out along the multiple glue discharging grooves 37 respectively, and is conveyed from the wide-mouth end to the narrow-mouth end of the conical opening 21 through the core single wire 4 and the multiple winding single wires 41. At this time, a stranding machine is used to strand the core single wire 4 and the multiple winding single wires 41 into strands, and then the stranded special-shaped aluminum alloy conductor wire core group is pulled and moved by a tractor to facilitate the implementation of the next step.

[0035] Further, when the stranding machine rotates the core single wire 4 and the multiple winding single wires 41 to strand them into strands, at this time, the core single wire 4 moves stably along the axis of the conical opening 21, while the multiple winding single wires 41 are driven by the stranding machine to rotate and rotate along the inner wall of the conical opening 21. The multiple winding single wires 41 will scrape the inner wall of the conical opening 21 during the rotation process. At this time, part of the water-blocking glue discharged along the glue discharging groove 37 flows on the inner wall of the conical opening 21, and the other part is scraped up by the rotating winding single wires 41 when it overflows from the glue discharging groove 37 and adheres to the winding single wires 41. At the same time, when the winding single wires 41 rotate, they also scrape up the water-blocking glue on the inner wall of the conical opening 21, so that the multiple winding single wires 41 are all attached with water-blocking glue when being stranded. Then, as the winding single wires 41 move from the wide-mouth end to the narrow-mouth end of the conical opening 21, the multiple winding single wires 41 gradually approach and wind around the core single wire 4 as they move. When the multiple winding single wires 41 approach the core single wire 4 at the same time, the water-blocking glue on the multiple winding single wires 41 will polymerize. Since the gap between two adjacent winding single wires 41 narrows, and the distance between the winding single wires 41 and the core single wire 4 further narrows, at this time, the excess water-blocking glue is respectively squeezed due to the approach and contraction of the multiple winding single wires 41. At this time, the squeezed water-blocking glue will flow along the gaps between the two winding single wires 41 and between the winding single wires 41 and the core single wire 4, so as to quickly fill the gaps between the two winding single wires 41 and between the winding single wires 41 and the core single wire 4. At the same time, the air existing between the two winding single wires 41 and between the winding single wires 41 and the core single wire 4 is pushed out by the fast-flowing water-blocking glue, thereby further reducing the air bubbles in the special-shaped aluminum alloy conductor wire core group and improving the uniformity and filling rate of the water-blocking glue coating on the special-shaped aluminum alloy conductor wire core group. Compared with the traditional method of directly applying water-blocking glue to the power cable from the outside, the filling rate of the water-blocking glue in the power cable can be effectively improved. And by using the mechanical force generated by the stranding between the core single wire 4 and the multiple winding single wires 41, the existing means such as a pressure pump can be effectively replaced, thereby saving production costs and improving the coating effect of the water-blocking glue.

[0036] As another embodiment provided by the present invention, a bunching channel 27 and a shaping wire channel 28 are opened on the stranding table 2 and are sequentially distributed at the narrow-mouth end of the conical opening 21.

[0037] Specifically, the bunching wire channel 27 is located on one side of the narrow end of the tapered opening 21, and the shaping wire channel 28 is located on the side opposite to the tapered opening 21 with respect to the bunching wire channel 27. The inner diameter of the bunching wire channel 27 is larger than the inner diameter of the shaping wire channel 28. When the core single wire 4 and multiple winding single wires 41 pass through the tapered opening 21, at this time, the multiple winding single wires 41 sequentially enter the bunching wire channel 27 and the shaping wire channel 28 when passing through the narrow end of the tapered opening 21. Under the support and limitation of the bunching wire channel 27 and the shaping wire channel 28, the winding single wires 41 are respectively within the tapered opening 21; between the bunching wire channel 27 and the shaping wire channel 28; and within the shaping wire channel 28 and are restricted to be in the following three states, as Figure 5 shown, when the winding single wires 41 are within the tapered opening 21, at this time, the included angle between the multiple winding single wires 41 and the core single wire 4 is the largest to be in the large included angle 42. When the winding single wires 41 are between the bunching wire channel 27 and the shaping wire channel 28, at this time, the included angle between the multiple winding single wires 41 and the core single wire 4 becomes smaller to be in the small included angle 43. When the winding single wires 41 are within the shaping wire channel 28, at this time, due to the limitation of the shaping wire channel 28, at this time, the multiple winding single wires 41 are respectively attached to the core single wire 4 to be in the completed state 44.

[0038] By switching the multiple winding single wires 41 from the large included angle 42 to the small included angle 43, and then to the completed state 44, when the multiple winding single wires 41 are gathered, the water-blocking glue can flow better between the bunching wire channel 27 and the shaping wire channel 28, so as to improve the filling effect of the water-blocking glue during stranding. And the extruded excess water-blocking glue can remain between the bunching wire channel 27 and the shaping wire channel 28 to wrap the entire core single wire 4 and multiple winding single wires 41, so that the water-blocking glue is restricted and realizes the immersion and wrapping of the special-shaped aluminum alloy conductor wire core group, thereby improving the uniformity of the filling of the special-shaped aluminum alloy conductor wire core group. The water-blocking glue extruded along the bunching wire channel 27 by the multiple winding single wires 41 will enter the tapered opening 21. Through the rotation and stranding of the multiple winding single wires 41, the problem of the water-blocking glue overflowing and being polluted and wasted from the tapered opening 21 can be reduced, so as to make full use of the water-blocking glue.

[0039] As another embodiment provided by the present invention, there is a glue storage cavity 35 communicating with both of them between the bunching wire channel 27 and the shaping wire channel 28, and there is an extrusion tapered opening 34 between the glue storage cavity 35 and the shaping wire channel 28; The circumferential radius of the narrow end of the extrusion tapered opening 34 is equal to the circumferential radius of the shaping wire channel 28.

[0040] Specifically, as Figure 9 shown, when the multiple winding single wires 41 move from the narrow end of the extrusion tapered opening 34 into the shaping wire channel 28, under the combined action of the shaping wire channel 28 and the narrow end of the extrusion tapered opening 34, the winding single wires 41 are extruded and the winding single wires 41 are tightly attached to the core single wire 4 to be in the completed state 44.

[0041] Furthermore, the glue storage cavity 35 is located between the single wire bundling channel 27 and the wire shaping channel 28. When multiple single wires 41 are gathered, the water-blocking glue overflows between the multiple single wires 41 and converges in the glue storage cavity 35. When the glue storage cavity 35 is filled with the water-blocking glue, the water-blocking glue will wrap the core single wire 4 and the multiple single wires 41 in the glue storage cavity 35, thereby comprehensively filling the glue for the special-shaped aluminum alloy conductor wire core group. At the same time, due to the viscosity between the special-shaped aluminum alloy conductor wire core group and the water-blocking glue, when the special-shaped aluminum alloy conductor wire core group in the glue storage cavity 35 moves towards the extrusion cone opening 34, the water-blocking glue will move towards the wire shaping channel 28 due to the movement of the special-shaped aluminum alloy conductor wire core group, so as to drive the water-blocking glue to converge in the extrusion cone opening 34. Since the space in the extrusion cone opening 34 gradually narrows, the pressure of the water-blocking glue at the narrow opening of the extrusion cone opening 34 is greater, and the extruded water-blocking glue will flow into the gaps between the multiple single wires 41 in the low-pressure area, thereby further filling the gaps remaining on the special-shaped aluminum alloy conductor wire core group with glue, so as to improve the quality of coating glue on the special-shaped aluminum alloy conductor wire core group.

[0042] As another embodiment provided by the present invention, glue spraying openings 33 are formed in the inner wall of the extrusion cone opening 34 and are distributed in a circumferential array.

[0043] Specifically, the glue spraying openings 33 are located on the inner wall of the extrusion cone opening 34 and close to the narrow opening of the extrusion cone opening 34. A glue injection pipe 22 is fixedly welded on the stranding table 2. An annular ring 3 formed in the stranding table 2 is communicated with the glue injection pipe 22, and the multiple glue spraying openings 33 are respectively communicated with the annular ring 3. The glue injection pipe 22 is communicated with a water-blocking glue filling machine, and the heated water-blocking glue is injected into the glue injection pipe 22 by using a pressure pump on the water-blocking glue filling machine. Then the water-blocking glue enters the glue spraying openings 33 along the annular ring 3 respectively. At this time, as Figure 8 shown by the solid arrows in the figure, it is the general flow direction of the water-blocking glue extruded from the glue spraying openings 33. When the water-blocking glue is sprayed along the glue spraying openings 33, part of it will converge between the multiple single wires 41, another part will enter the glue storage cavity 35, and still another part will flow along the gaps between the multiple single wires 41 together with the water-blocking glue extruded between the multiple single wires 41 and enter the conical opening 21, so as to increase the range of the single wires 41 dipped in glue, thereby reducing the generation of air bubbles. As Figure 8The dashed arrows indicate the directions in which the multiple winding single wires 41 and the core single wire 4 in the special-shaped aluminum alloy conductor wire core group drive the water-blocking glue to move, and the directions in which the water-blocking glue flows when the multiple winding single wires 41 extrude the water-blocking glue. Through the adhesiveness between the special-shaped aluminum alloy conductor wire core group and the water-blocking glue, the special-shaped aluminum alloy conductor wire core group drives the water-blocking glue into the extrusion cone opening 34 and the glue storage cavity 35. The water-blocking glue converging in the extrusion cone opening 34 will simultaneously receive the entrainment thrust when the special-shaped aluminum alloy conductor wire core group moves and the pressure of the water-blocking glue extruded from the glue spraying opening 33. At this time, the two pressure points act on the same area of the extrusion cone opening 34, so that the water-blocking glue under high pressure flows towards the low-pressure area, and the area in the low-pressure area where the water-blocking glue is not completely filled is quickly filled with the water-blocking glue in the high-pressure area, thereby further improving the filling effect of the water-blocking glue.

[0044] Meanwhile, as Figure 9 shown, the glue storage cavity 35 is respectively connected to a plurality of glue discharging grooves 37 through a plurality of flow channels 36 opened in the stranding table 2. The water-blocking glue in the glue storage cavity 35 will flow into the plurality of glue discharging grooves 37 along the plurality of flow channels 36 respectively, so that the water-blocking glue can flow in the plurality of glue discharging grooves 37 to facilitate the scraping and smearing of the water-blocking glue by the multiple winding single wires 41.

[0045] As the optimal embodiment provided by the present invention, an annular compensation groove 32 is arranged at one end of the shaping wire channel 28 relative to the extrusion cone opening 34.

[0046] Specifically, as Figure 4 shown, a front recovery groove 23 is opened on the inner wall of the conical opening 21 near the wide-mouth end side, a rear recovery groove 25 is opened on the stranding table 2 on one side of the annular compensation groove 32, a collection cavity 24 communicating with the front recovery groove 23 and the rear recovery groove 25 is opened on the stranding table 2, and a drain pipe 26 communicating with the collection cavity 24 is fixedly installed on the stranding table 2. The drain pipe 26 is connected to the feeding port on the water-blocking glue filling machine, so as to cooperate with the corresponding pressure pump to enable the water-blocking glue recovered from the front recovery groove 23 and the rear recovery groove 25 to be recycled again, so as to reduce the problems of water-blocking glue waste and pollution.

[0047] Meanwhile, as Figure 10 and Figure 4As shown in the figure, a compensation channel 31 is provided on the stranding table 2, with both ends communicating with the annular compensation groove 32 and the ring 3 respectively. The water-blocking glue in the ring 3 flows along the compensation channel 31 into the annular compensation groove 32. When the profiled aluminum alloy conductor core group passes through the annular compensation groove 32, a certain thickness of water-blocking glue will be formed on the outer wall of the profiled aluminum alloy conductor core group, so as to solve the problem of water-blocking glue loss or incomplete distribution caused by the extrusion friction between the profiled aluminum alloy conductor core group pulled out from the shaping wire channel 28 and the inner wall of the shaping wire channel 28. At the same time, by forming a certain thickness of water-blocking glue on the outer wall of the profiled aluminum alloy conductor core group through the annular compensation groove 32, it can better contact with the anti-water tree insulation layer 15, so as to reduce the problem of gaps between the anti-water tree insulation layer 15 and the profiled aluminum alloy conductor core group.

[0048] As another embodiment provided by the present invention, an elastic plate 5 is fixedly installed on the inner wall of the glue discharge groove 37, which extends obliquely to the outside of the groove opening. During the movement of the single wire 41, the elastic plate 5 is swept and the elastic plate 5 moves towards the inside of the glue discharge groove 37 to extrude the water-blocking glue.

[0049] Specifically, anti-overflow baffles are fixedly installed on both opposite sides of the elastic plate 5. In the default state, the elastic force of the elastic plate 5 will make the elastic plate 5 extend obliquely to the outside of the groove opening and be located on the movement path of the single wire 41. In the default state, one end of the elastic plate 5 fits on the inner wall of the glue discharge groove 37. At this time, the elastic plate 5 is used to shield and seal the glue discharge groove 37. When the single wire 41 rotates and twists and sweeps the elastic plate 5, at this time, the elastic plate 5 is extruded by the single wire 41 and moves towards the inside of the glue discharge groove 37. At this time, due to the deformation of the elastic plate 5, the glue discharge groove 37 is opened. At the same time, the extrusion of the water-blocking glue in the glue discharge groove 37 by the elastic plate 5 and the pressure of the water-blocking glue itself in the glue discharge groove 37 are used to quickly extrude the water-blocking glue from the glue discharge groove 37. Then, as the single wire 41 passes by, the water-blocking glue is smeared onto the single wire 41. When the single wire 41 leaves the elastic plate 5 and the elastic plate 5 returns to its deformed state, the glue discharge groove 37 is closed. Thus, the glue discharge groove 37 is controlled to open when the single wire 41 passes by and close when the single wire 41 passes by, so as to avoid the problem of long-term glue flow in the glue discharge groove 37, resulting in out-of-control glue overflow and pollution, etc., so as to reasonably and effectively utilize the water-blocking glue. The elastic plate 5 is made of elastic stainless steel plate.

[0050] As another embodiment provided by the present invention, it further includes a liquid storage groove 39, and the single wire 41 moves and sweeps through the glue discharge groove 37 and the liquid storage groove 39 in sequence.

[0051] Specifically, an upper plate 52 is fixedly installed at the end of the elastic plate 5, and a lower plate 53 is fixedly installed at the bottom end of the upper plate 52. A flow cavity 38 communicating with the glue discharge groove 37 is formed in the inner wall of the liquid storage groove 39, and an airbag 6 is fixedly installed on the inner wall of the glue discharge groove 37 on one side of the flow cavity 38. An opening 61 is formed in the airbag 6, and the airbag 6 is located between the elastic plate 5 and the liquid storage groove 39. In the default state, the elastic plate 5 extends obliquely to the outside of the notch, and the lower plate 53 on the elastic plate 5 squeezes the airbag 6 to deform and seal the flow cavity 38. When the elastic plate 5 is pressed down around the monofilament 41 and moves towards the inside of the notch of the glue discharge groove 37, at this time, the lower plate 53 disengages from the airbag 6, and the upper plate 52 begins to contact the airbag 6. As Figure 11 and Figure 12 shown, when the upper plate 52 contacts the airbag 6, the extrusion force on the airbag 6 decreases, and then with the reset of the airbag 6, the sealing of the flow cavity 38 is released. At the same time, the water-blocking glue in the glue discharge groove 37 flows along the flow cavity 38 into the liquid storage groove 39, and a part of the water-blocking glue in the liquid storage groove 39 enters the airbag 6 along the opening 61. Then, with the rotational movement of the monofilament 41 around the monofilament 41, the monofilament 41 disengages from the elastic plate 5 and scrapes the water-blocking glue overflowing in the liquid storage groove 39. At the same time, when the elastic plate 5 resets, it presses the airbag 6 again. At this time, the water-blocking glue in the airbag 6 is squeezed by the lower plate 53 and sprayed out from the opening 61 and adhered to the monofilament 41, thereby increasing the amount and uniformity of the water-blocking glue adhered to the monofilament 41.

[0052] As the optimal embodiment further provided by the present invention, the upper surface of the low plate 51 fixedly installed at the end of the elastic plate 5 is lower than the upper surface of the elastic plate 5.

[0053] Specifically, in accordance with Figure 12Taking this as a reference, the upper surface of the lower plate 51 is lower than the upper surface of the elastic plate 5. When the elastic plate 5 is extruded around the single wire 41, the elastic plate 5 and the lower plate 51 move inwardly towards the notch of the glue discharge groove 37 simultaneously. Along with the movement of the single wire 41 and the opening of the flow cavity 38, the water-blocking glue in the glue discharge groove 37 flows towards the liquid storage groove 39 and the lower plate 51. Then, when the single wire 41 is transferred from the elastic plate 5 to the lower plate 51, due to the height difference between the elastic plate 5 and the lower plate 51 at this time, combined with the elastic reset of the elastic plate 5, the lower plate 51 quickly approaches the single wire 41 and knocks on the single wire 41 to generate vibration when it contacts the single wire 41. At the same time, the water-blocking glue remaining on the upper surface of the lower plate 51 is quickly pushed onto the single wire 41. Meanwhile, the lower plate 53 is used to squeeze the airbag 6 to make the opening 61 spray out the water-blocking glue and adhere it to the single wire 41, thereby making the water-blocking glue adhered to the single wire 41 more sufficient. Through the vibration of the single wire 41 and the twisting and converging of multiple single wires 41, multiple single wires 41 that are twisted between the bunching wire channel 27 and the shaping wire channel 28 approach and converge to squeeze the water-blocking glue, and vibrate simultaneously to discharge the air remaining between multiple single wires 41 and between the single wire 41 and the core single wire 4, thereby reducing the generation of air bubbles. The quality and filling rate of the water-blocking glue coating are improved.

[0054] Working principle: When the core single wire 4 and multiple single wires 41 are conveyed from the wide-mouth end to the narrow-mouth end of the tapered opening 21, multiple single wires 41 scrape the inner wall of the tapered opening 21 during the rotation process. At this time, the water-blocking glue discharged along the glue discharge groove 37 is scraped up by the rotating single wire 41 and adhered to the single wire 41. When the single wire 41 extrudes the elastic plate 5, the elastic plate 5 and the lower plate 51 move inwardly towards the notch of the glue discharge groove 37 simultaneously, and the flow cavity 38 is opened to make the water-blocking glue in the glue discharge groove 37 flow towards the liquid storage groove 39 and the lower plate 51. Then, when the single wire 41 is transferred from the elastic plate 5 to the lower plate 51, the elastic plate 5 elastically resets, and the lower plate 51 knocks on the single wire 41 to generate vibration and push the water-blocking glue onto the single wire 41. Meanwhile, the lower plate 53 is used to squeeze the airbag 6 to make the opening 61 spray out the water-blocking glue and adhere it to the single wire 41.

[0055] Then, multiple single wires 41 move to gradually approach and wind around the core single wire 4. At the same time, the water-blocking glue on multiple single wires 41 will polymerize. At this time, the excess water-blocking glue is respectively squeezed due to the approach and contraction of multiple single wires 41 to fill the gaps between the shaped aluminum alloy conductor wire cores. Combined with the vibration generated by the lower plate 51 knocking on the single wire 41, the air existing in the gaps between the shaped aluminum alloy conductor wire cores is discharged, thereby reducing the air bubbles in the shaped aluminum alloy conductor wire cores.

[0056] Only certain exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system, characterized in that: It comprises a twisted special-shaped aluminum alloy conductor wire core group, the outer side of which is extruded with an anti-water tree insulation layer (15), wherein: A plurality of water-tree resistant insulating layers (15) are arranged in a circular array, and an aluminum-plastic composite tape (13), a polyethylene inner lining layer (12), an armored steel tape (11), and a weather-resistant polyethylene outer sheath (1) are arranged in sequence from the inside to the outside along the axis of the circular array of the water-tree resistant insulating layers (15); The aluminum-plastic composite strip (13) is filled with a water-blocking filling layer (14) between the plurality of water-tree resistant insulating layers (15), and the water-blocking glue layer (16) is filled between the water-tree resistant insulating layers (15) located between the special-shaped aluminum alloy conductor core groups.

2. A water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 1, characterized in that: The special-shaped aluminum alloy conductor wire core group comprises a core single wire (4) and a plurality of winding single wires (41) twisted on the outside of the core single wire (4).

3. A method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system, which is used to achieve the water-blocking adhesive layer (16) filled between the special-shaped aluminum alloy conductor wire core groups in the water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system as described in claims 1-2, characterized in that: It comprises a twisting table (2) with a conical opening (21) formed on it; During the process of conveying the core monofilament (4) and the plurality of winding monofilaments (41) from the wide end to the narrow end of the tapered mouth (21), the plurality of winding monofilaments (41) adhere to the inner wall of the tapered mouth (21); The inner wall of the tapered opening (21) is provided with a plurality of glue discharge grooves (37) for flowing out the water-blocking glue.

4. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 3, characterized in that: The twisting table (2) is provided with a wire bundling path (27) and a wire shaping path (28) which are sequentially distributed at the narrow end of the conical opening (21).

5. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 4, characterized in that: There is a glue storage cavity (35) between the wire bundling channel (27) and the shaping wire channel (28) and is in communication with the two channels. There is an extrusion cone (34) between the glue storage cavity (35) and the shaping wire channel (28). The narrow opening radius of the extrusion cone (34) is equal to the circumferential radius of the shaping wire path (28).

6. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 5, characterized in that: The inner wall of the extrusion cone (34) is provided with glue spraying ports (33) distributed in a circular array.

7. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 4, characterized in that: An annular compensation groove (32) is arranged at one end of the shaping wire channel (28) opposite to the extrusion cone (34).

8. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 3, characterized in that: An elastic plate (5) is fixedly mounted on the inner wall of the adhesive discharge groove (37) and extends obliquely to the outside of the groove opening. During the movement of the winding monofilament (41), the elastic plate (5) is swept and moved toward the inside of the groove opening of the adhesive discharge groove (37) to press out the water-blocking adhesive.

9. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 8, characterized in that: It also includes a liquid storage groove (39), and moves around the monofilament (41) and sweeps through the glue discharge groove (37) and the liquid storage groove (39) in sequence.

10. The method for preparing a water-blocking aluminum alloy core low-voltage power cable for a photovoltaic power generation system according to claim 8, characterized in that: The upper surface of the low-position plate (51) fixedly mounted at the end of the elastic plate (5) is lower than the upper surface of the elastic plate (5).

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