Neutral wire core for user side power supply cable

Abstract

The utility model discloses a neutral wire core for a user side power supply cable. The neutral wire core is sparsely wound and arranged outside a main insulation wire core of the user side power supply cable. The neutral wire core is provided with a plurality of neutral conductors which are arranged in the same insulation structure side by side at intervals, and the adjacent neutral conductors are separated by the insulation structure; when the neutral wire core is in an unfolded state, the cross section of the neutral wire core is linear. According to the utility model, on the basis of a one-line dual-purpose arrangement structure of the neutral wire core in a cable structure, the formed neutral wire core has good insulation performance, a plurality of neutral conductors can form an integral connection structure, the forming is standard and orderly, and the compact structure of the formed user-side power supply cable is facilitated.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a neutral line core used for a user-side power supply cable. Background Art

[0002] The user-side power supply cable is a key electrical connection structure for the user's electrical facilities to access the power supply line, and is closely related to the user's power safety. In order to ensure the personal safety of the user's electricity use and the stable operation of the electrical facilities, a neutral core is set in the user-side power supply cable structure. The neutral core is used as the return path of the current in the circuit. Under normal circumstances, it carries harmonic currents mainly caused by phase current imbalance.

[0003] The traditional user-end power supply cable with a neutral core is a cable core formed by twisting the neutral core and the main insulating core together. The neutral core only plays the role of a neutral current carrier in the cable structure and cannot shield the cable structure against electromagnetic interference. If the cable is to achieve the shielding function against electromagnetic interference, it is necessary to add a metal shielding structure layer on the outside of the cable core structure. For example, the Chinese patent literature discloses technologies such as "frequency conversion cable" (publication number CN 202268204 U, publication date June 6, 2012), "water-blocking thick steel wire armored power cable" (publication number CN 203351283 U, publication date December 18, 2013), "high-load and high-temperature resistant soft power cable for frequency converter" (publication number CN 2762296 Y, publication date March 1, 2006), and "environmentally friendly frequency conversion cable" (publication number CN 202268186 U, publication date June 6, 2012). This type of cable structure is provided with both a neutral core and a metal shielding layer, which makes the overall structure of the formed cable more complicated, is not conducive to the compactness of the overall structure, and the molding cost is also high.

[0004] In order to give full play to the role of the neutral core in the user-side power supply cable structure and effectively simplify the molding structure of the user-side power supply cable, the neutral core can be sparsely wound outside the cable core composed of the main insulating core, so that it can be used for two purposes, and bear the shielding function against electromagnetic interference while carrying neutral current. For example, the Chinese patent literature discloses the technology named "concentric low-voltage bipolar cable" (publication number CN 201667253 U, published on December 8, 2010) and "new composite structure aluminum alloy cable" (publication number CN 203746440 U, ​​published on July 30, 2014). However, the neutral core of these technologies is just to sparsely wind multiple exposed neutral conductors side by side outside the main insulating core, and there is no direct connection structure between adjacent neutral conductors. Therefore, when used at the user end, on the one hand, there is a technical problem of poor insulation performance; on the other hand, each neutral conductor cannot form a standardized and orderly overall connection and positioning, and is easy to loosen and deform. Utility Model Content

[0005] The technical purpose of the utility model is to provide a neutral core for user-end power supply cable which has good insulation performance, enables multiple neutral conductors to form an overall connection structure, and has standardized and orderly molding, based on the arrangement structure of a neutral core for two uses in the cable structure in view of the particularity of the above-mentioned user-end power supply cable and the shortcomings of the prior art.

[0006] The technical purpose of the utility model is achieved by the following technical scheme: a neutral core for a user-end power supply cable, wherein the neutral core is sparsely arranged outside the main insulating core of the user-end power supply cable;

[0007] The neutral core has a plurality of neutral conductors spaced apart and arranged side by side in the same insulating structure, and adjacent neutral conductors are separated by insulating structures;

[0008] When the neutral line core is in an unfolded state, the transverse cross section is in a straight line shape.

[0009] The above technical measures are aimed at the particularity of the user-side power supply cable. Based on the arrangement structure of the neutral core in the cable structure, multiple neutral conductors are arranged side by side in the same insulation structure to form an integrated associated structure with a straight cross-section. When applied in the user-side power supply cable structure, it has the following technical advantages:

[0010] On the one hand, multiple neutral conductors connected in a straight line are easy to be sparsely wound outside the main insulated core;

[0011] Secondly, the multiple neutral conductors of the overall connection structure can be sparsely wound on the outside of the main insulating core in a standardized and orderly manner, and are compactly and standardizedly formed on the outside of the main insulating core, and are not easy to loosen or deform;

[0012] Thirdly, the standardized and orderly winding of the neutral core can effectively balance the electric field outside the main insulation core, thereby reliably enhancing the anti-electromagnetic interference performance of the user-side power supply cable;

[0013] Fourthly, it has good insulation performance, which is conducive to reducing the technical requirements for the insulation performance of other external protective structure layers, has good safety, and is conducive to simplifying the molding structure of the user-side power supply cable.

[0014] As one of the preferred solutions, each neutral conductor of the neutral core has a relatively independent neutral insulation layer on the outside, and adjacent neutral insulation layers are transitioned by integrally formed connecting ribs, and a matching gap of a concave structure is formed between adjacent neutral insulation layers at both ends of the connecting ribs;

[0015] When the neutral core is in an unfolded state, the transverse cross section presents a straight-line structure with wavy top and bottom sides.

[0016] Under the premise of ensuring the standardized and orderly overall connection of multiple neutral conductors, the above-mentioned technical measures can effectively increase the contact adhesion between the outer wall of the main insulating core and the protective layer structure formed on the outside of the neutral core through the wavy I-shaped insulation structure on the top and bottom sides when it is sparsely wound outside the main insulating core. In particular, the extruded molding structure of the external protective layer can form an interlocking fit, and adjacent structural layers are not easy to loosen or slip, and have good stability.

[0017] Furthermore, the neutral insulation layer of the neutral core has a thickness of 0.25 to 0.40 mm.

[0018] Furthermore, the insulation structure of the neutral core is an extruded structure of polyethylene material.

[0019] The insulation structure of the above technical measures, on the one hand, effectively meets the insulation effect of the neutral core, and on the other hand, is light in weight and has good flexibility.

[0020] Furthermore, the length of the connection rib of the neutral core is 0.25-0.35 mm. This technical measure effectively takes into account the equalization effect of the neutral core on the electric field outside the main insulating core while ensuring the standardized and orderly overall connection of multiple neutral conductors.

[0021] As one of the preferred solutions, the neutral conductors of the neutral line core are 7 to 9 arranged at intervals.

[0022] Furthermore, the neutral conductor of the neutral line core is a single copper wire structure.

[0023] The neutral core of the above technical measures effectively takes into account the effects of neutral current carrying and anti-electromagnetic interference shielding. When used in the user-side power supply cable structure, it can reliably play the function of one line for two purposes.

[0024] As one of the preferred solutions, the outer surface of the insulation structure of the neutral core is a non-smooth friction-increasing structure;

[0025] The roughness of the friction-increasing structure is 25 to 50 Ra;

[0026] In the user-end power supply cable structure, the inner outer surface of the neutral core forms a frictional contact with the insulation structure of the main insulating core, and the outer outer surface of the neutral core forms a frictional contact with the sheath layer coated on the outside of the neutral core sparse winding layer.

[0027] The neutral core of the above technical measures, when applied in the user-side power supply cable structure, can form stable contact and adhesion with adjacent structural layers, and has a good anti-slip effect.

[0028] Furthermore, the user-side power supply cable comprises a main insulating core, a neutral core, a grounding core and a signal core sparsely wound outside the main insulating core, a sheath layer extruded outside the sparsely wound structure, and a transparent weather-resistant layer extruded outside the sheath layer;

[0029] There are at least two signal cores, which are divided into two groups and arranged on both sides of the neutral core to separate the neutral core from the ground core.

[0030] Furthermore, the main insulating core is composed of a main conductor of a twisted structure, a main insulating layer extruded outside the main conductor, and a transparent main insulating protective layer extruded outside the main insulating layer.

[0031] The user-side power supply cable including the above-mentioned neutral core takes into account the neutral current carrying and anti-electromagnetic interference shielding functions through the neutral core with two functions, and does not need to add a neutral core or metal shielding layer. Its molding structure is simple and compact, and the main conductor and the neutral conductor each have a corresponding insulation structure, and the insulation performance is stable and reliable, which is conducive to enhancing the safety of electricity use. In addition, the neutral core and the grounding core outside the main insulating core are separated by the signal core, so that the mutual interference between the neutral core and the grounding core can be effectively avoided, so as to ensure that the user-side power supply cable can be stably and reliably connected to the circuit system.

[0032] The beneficial technical effect of the utility model is as follows: the above technical measures are aimed at the particularity of the user-side power supply cable, based on the arrangement structure of the neutral core in the cable structure, multiple neutral conductors are arranged side by side in the same insulation structure, and an integrated associated structure with a straight cross section is formed through the same insulation structure. When applied in the user-side power supply cable structure, it has the following technical advantages:

[0033] On the one hand, multiple neutral conductors connected in a straight line are easy to be sparsely wound outside the main insulated core;

[0034] Secondly, the multiple neutral conductors of the overall connection structure can be sparsely wound on the outside of the main insulating core in a standardized and orderly manner, and are compactly and standardizedly formed on the outside of the main insulating core, and are not easy to loosen or deform;

[0035] Thirdly, the standardized and orderly winding of the neutral core can effectively balance the electric field outside the main insulation core, thereby reliably enhancing the anti-electromagnetic interference performance of the user-side power supply cable;

[0036] Fourthly, it has good insulation performance, which is conducive to reducing the technical requirements for the insulation performance of other external protective structure layers, has good safety, and is conducive to simplifying the molding structure of the user-side power supply cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the utility model.

[0038] Figure 2 This is a reference diagram of a usage state of the utility model.

[0039] The meaning of the codes in the figure are: 1—neutral core; 11—neutral conductor; 12—neutral insulation layer; 13—connecting rib; 2—main insulation core; 21—main conductor; 22—main insulation layer; 23—main insulation protective layer; 3—sheath layer; 4—ground core; 5—signal core; 6—weather-resistant layer. DETAILED DESCRIPTION

[0040] The utility model relates to a cable, specifically a neutral core for a user-side power supply cable. The main technical solution of the utility model is specifically described below in combination with multiple embodiments. Figure 1 and Figure 2 The technical solution of the present utility model is clearly and in detail explained; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0041] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention in the prior art. In addition, the expressions "approximately" and "substantially" in the following text regarding quantity or matching relationship mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantity or matching relationship.

[0042] Example 1

[0043] See also Figure 1 and Figure 2 As shown, the utility model is a neutral core for a user-end power supply cable, which is sparsely arranged outside the main insulating core 2 of the user-end power supply cable.

[0044] The molding structure of the user-side power supply cable is as follows Figure 2 As shown, it has a main insulating core 2, seven neutral cores 1 that are sparsely wound outside the main insulating core 2, three independent grounding cores 4 and two independent signal cores 5, a sheath layer 3 extruded outside the sparsely wound structure, and a transparent weather-resistant layer 6 extruded outside the sheath layer 3.

[0045] Specifically, the main insulated wire core 2 is composed of a main conductor 21 of a twisted structure, a main insulating layer 22 extruded outside the main conductor 21, and a main insulating protective layer 23 extruded outside the main insulating layer 22. In order to facilitate wiring identification, the main insulating layer 22 is a colored insulating structure. The main insulating protective layer 23 is an ultraviolet-proof, transparent structure, which enhances the aging resistance of the main insulating layer 22 and facilitates intuitive identification of the main conductor 21 covered by the main insulating layer 22.

[0046] Each signal core 5 is composed of a signal transmission conductor and a signal transmission insulation layer wrapped on the outside thereof, and the signal transmission conductor adopts a single copper wire structure. The two signal cores 5 are placed on both sides of the neutral core 1 to separate the neutral core 1 from the three grounding cores 4. The two signal cores 5 can use different insulation colors to distinguish the positive and negative poles, forming a signal loop in the application.

[0047] Each grounding wire core is composed of a single bare copper wire or a single bare aluminum wire, which enhances the protection function of cable short-circuit grounding in application.

[0048] The above-mentioned sparse winding structure is composed of a neutral core 1, a signal core 5 and a ground core 4 arranged in a concentric sparse winding structure, and the sparse winding pitch is not greater than 10 times the outer diameter of the concentric layer, which effectively utilizes the cable structure space, realizes the composite integration of cable functions, and ensures that the cable structure size is compact.

[0049] The sheath layer 3 is formed by extrusion of a polyethylene material that is UV-proof, rat-proof and termite-proof, ensuring that the cable has the properties of UV-proof, rat-proof and termite-proof.

[0050] The weather-resistant layer 6 is formed by extrusion of a transparent anti-ultraviolet plastic compound or by wrapping of a transparent anti-ultraviolet film, and has a thickness of about 0.25 mm, which enhances the weather-resistant performance of the sheath layer 3 .

[0051] The molding structure of the neutral core 1 is as follows Figure 1 As shown, there are seven neutral conductors 11 spaced apart and arranged side by side in the same insulating structure, and adjacent neutral conductors 21 are separated by the insulating structure.

[0052] Specifically, each neutral conductor 11 is a single copper wire structure, and the diameter of the copper wire is determined by the current-carrying specification of the formed user-end power supply cable, and is not a specific value.

[0053] On the outside of each neutral conductor 11, a relatively independent neutral insulating layer 12 is extruded with a polyethylene material extrusion structure. The outer contour of each neutral insulating layer 12 is circular, and its thickness is about 0.30mm. Adjacent neutral insulating layers 12 are transitioned by integrally formed connecting ribs 13, that is, the connecting ribs 13 are also an extruded structure of polyethylene material, and are extruded integrally with the neutral insulating layer 12, and the length of the connecting ribs 13 is about 0.30mm. Under the transition connection of the connecting ribs 13, a matching gap of a concave structure is formed between the adjacent neutral insulating layers 12 at both ends of the connecting ribs 13, that is, the adjacent neutral insulating layers 12 under the transition connection of the connecting ribs 13 are dumbbell-shaped. When the neutral core 1 of the above-mentioned structure is in the unfolded state, the transverse cross-section is a wavy I-shaped structure on the top and bottom sides, which is conducive to sparse winding and enhanced adhesion outside the main insulating core.

[0054] The neutral core 1 of the above structure, when used for sparse winding in the user-side power supply cable structure, in order to enhance its anti-skid adhesion with the main insulating core 2 and the outer extruded sheath layer 3, the outer surface of the insulation structure of the neutral core 1 is a non-smooth friction-increasing structure, which is formed by roughening or grinding, and the roughness of the friction-increasing structure is about 40Ra. When sparsely wound in the user-side power supply cable structure, the friction-increasing inner outer surface of the neutral core 1 forms a frictional contact with the insulation structure of the main insulating core 2, and the friction-increasing outer surface of the neutral core 1 forms a frictional contact with the sheath layer 3 coated on the outside of the sparse winding layer of the neutral core.

[0055] Example 2

[0056] The utility model provides a neutral core for a user-end power supply cable, which is sparsely wound and arranged outside a main insulating core of the user-end power supply cable.

[0057] The neutral core has eight neutral conductors spaced apart and arranged side by side in the same insulation structure, and adjacent neutral conductors are separated by the insulation structure.

[0058] Specifically, each neutral conductor is a single copper wire structure, and the diameter of the copper wire is determined by the current-carrying specification of the formed user-end power supply cable, which is not a specific value.

[0059] On the outside of each neutral conductor, a relatively independent neutral insulation layer is extruded with a polyethylene material extrusion structure. The outer contour of each neutral insulation layer is circular, and its thickness is about 0.40mm. Adjacent neutral insulation layers are transitioned by integrally formed connecting ribs, that is, the connecting ribs are also an extruded structure of polyethylene material, and are extruded integrally with the neutral insulation layer, and the length of the connecting ribs is about 0.35mm. Under the transition connection of the connecting ribs, a matching gap of a concave structure is formed between the adjacent neutral insulation layers at both ends of the connecting ribs, that is, the adjacent neutral insulation layers under the transition connection of the connecting ribs are dumbbell-shaped. When the neutral core of the above-mentioned structure is in the unfolded state, the transverse cross-section presents a wavy I-shaped structure on the top and bottom sides, which is conducive to sparse winding and enhanced adhesion on the outside of the main insulating core.

[0060] When the neutral core of the above structure is used for sparse winding in the user-side power supply cable structure, in order to enhance its anti-skid adhesion with the main insulating core and the outer extruded sheath layer, the outer surface of the insulation structure of the neutral core is a non-smooth friction-increasing structure, which is formed by roughening or grinding, and the roughness of the friction-increasing structure is about 50Ra. When sparse winding is performed in the user-side power supply cable structure, the friction-increasing inner outer surface of the neutral core forms a friction contact with the insulation structure of the main insulating core, and the friction-increasing outer surface of the neutral core forms a friction contact with the sheath layer coated on the outside of the sparse winding layer of the neutral core.

[0061] Example 3

[0062] The utility model provides a neutral core for a user-end power supply cable, which is sparsely wound and arranged outside a main insulating core of the user-end power supply cable.

[0063] The neutral core has nine neutral conductors spaced apart and arranged side by side in the same insulation structure, and adjacent neutral conductors are separated by the insulation structure.

[0064] Specifically, each neutral conductor is a single copper wire structure, and the diameter of the copper wire is determined by the current-carrying specification of the formed user-end power supply cable, which is not a specific value.

[0065] The outside of each neutral conductor is extruded with a relatively independent neutral insulation layer made of a polyethylene material. The outer contour of each neutral insulation layer is circular, and its thickness is about 0.25mm. Adjacent neutral insulation layers are transitioned by integrally formed connecting ribs, that is, the connecting ribs are also an extruded structure of polyethylene material, and are extruded integrally with the neutral insulation layer, and the length of the connecting ribs is about 0.25mm. Under the transition connection of the connecting ribs, a matching gap of a concave structure is formed between the adjacent neutral insulation layers at both ends of the connecting ribs, that is, the adjacent neutral insulation layers under the transition connection of the connecting ribs are dumbbell-shaped. When the neutral core of the above-mentioned structure is in the unfolded state, the transverse cross-section presents a wavy I-shaped structure on the top and bottom sides, which is conducive to sparse winding and enhanced adhesion on the outside of the main insulating core.

[0066] When the neutral core of the above structure is used for sparse winding in the user-side power supply cable structure, in order to enhance its anti-skid adhesion with the main insulating core and the outer extruded sheath layer, the outer surface of the insulation structure of the neutral core is a non-smooth friction-increasing structure, which is formed by roughening or grinding, and the roughness of the friction-increasing structure is about 25Ra. When sparse winding is performed in the user-side power supply cable structure, the friction-increasing inner outer surface of the neutral core forms a friction contact with the insulation structure of the main insulating core, and the friction-increasing outer surface of the neutral core forms a friction contact with the sheath layer coated on the outside of the sparse winding layer of the neutral core.

[0067] Example 4

[0068] The utility model provides a neutral core for a user-end power supply cable, which is sparsely wound and arranged outside a main insulating core of the user-end power supply cable.

[0069] The neutral core has seven neutral conductors spaced apart and arranged side by side in the same insulation structure, and adjacent neutral conductors are separated by the insulation structure.

[0070] Specifically, each neutral conductor is a single copper wire structure, and the diameter of the copper wire is determined by the current-carrying specification of the formed user-end power supply cable, which is not a specific value.

[0071] The outside of each neutral conductor is extruded with a neutral insulation layer made of polyethylene material, and the thickness of the neutral insulation layer is about 0.35mm at the thinnest part. When the neutral core of the above structure is unfolded, the transverse cross section is a straight-line structure with flat top and bottom sides.

[0072] When the neutral core of the above structure is used for sparse winding in the user-side power supply cable structure, in order to enhance its anti-skid adhesion with the main insulating core and the outer extruded sheath layer, the outer surface of the insulation structure of the neutral core is a non-smooth friction-increasing structure, which is formed by roughening or grinding, and the roughness of the friction-increasing structure is about 50Ra. When sparse winding is performed in the user-side power supply cable structure, the friction-increasing inner outer surface of the neutral core forms a friction contact with the insulation structure of the main insulating core, and the friction-increasing outer surface of the neutral core forms a friction contact with the sheath layer coated on the outside of the sparse winding layer of the neutral core.

[0073] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0074] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the above embodiments or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A neutral core for a user-end power supply cable, wherein the neutral core (1) is sparsely arranged outside a main insulating core (2) of the user-end power supply cable; Features: The neutral line core (1) has a plurality of neutral conductors (11) arranged side by side at intervals in the same insulation structure, and adjacent neutral conductors (11) are separated by an insulation structure; When the neutral line core (1) is in an unfolded state, its transverse cross section is in the shape of a straight line.

2. The neutral core for user-side power supply cable according to claim 1, characterized in that: Each neutral conductor (11) of the neutral line core (1) has a relatively independent neutral insulating layer (12) on the outside, adjacent neutral insulating layers (12) are transitioned by integrally formed connecting ribs (13), and a matching gap with a concave structure is formed between adjacent neutral insulating layers (12) at both ends of the connecting ribs (13); When the neutral line core (1) is in an unfolded state, the transverse cross section presents a straight-line structure with wavy top and bottom sides.

3. The neutral core for user-side power supply cable according to claim 2, characterized in that: The neutral insulating layer (12) of the neutral line core (1) has a thickness of 0.25 to 0.40 mm.

4. The neutral core for user-side power supply cable according to claim 1, 2 or 3, characterized in that: The insulation structure of the neutral line core (1) is an extruded structure of polyethylene material.

5. The neutral core for user-side power supply cable according to claim 2, characterized in that: The length of the connecting rib (13) of the neutral core (1) is 0.25-0.35 mm.

6. The neutral core for user-side power supply cable according to claim 1 or 2, characterized in that: The neutral conductors (11) of the neutral line core (1) are 7 to 9 arranged at intervals.

7. The neutral core for user-side power supply cable according to claim 6, characterized in that: The neutral conductor (11) of the neutral line core (1) is a single copper wire structure.

8. The neutral core for user-side power supply cable according to claim 1 or 2, characterized in that: The outer surface of the insulation structure of the neutral line core (1) is a non-smooth friction-increasing structure; The roughness of the friction-increasing structure is 25 to 50 Ra; In the user-end power supply cable structure, the inner outer surface of the neutral core (1) forms a frictional contact fit with the insulation structure of the main insulating core (2), and the outer outer surface of the neutral core (1) forms a frictional contact fit with the sheath layer (3) coated outside the sparse winding layer of the neutral core.

9. The neutral core for user-side power supply cable according to claim 8, characterized in that: The user-end power supply cable comprises a main insulating core (2), a neutral core (1), a grounding core (4) and a signal core (5) sparsely wound outside the main insulating core (2), a sheath layer (3) extruded outside the sparsely wound structure, and a transparent weather-resistant layer (6) extruded outside the sheath layer (3); There are at least two signal cores (5), and the signal cores (5) are divided into two groups and arranged on both side edges of the neutral core (1), so as to separate the neutral core (1) from the ground core (4).

10. The neutral core for user-side power supply cable according to claim 9, characterized in that: The main insulated wire core (2) is composed of a main conductor (21) of a twisted structure, a main insulating layer (22) extruded outside the main conductor (21), and a transparent main insulating protective layer (23) extruded outside the main insulating layer (22).

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