An expandable multi-core fire-retardant power cable

Abstract

The present invention belongs to the technical field of cables, and in particular relates to an expandable multi-core fire-retardant power cable, comprising a plurality of first electrical units, (n+1)(n+2) / 2 first protection components and n(n+1) / 2 second protection components, where n≥1, and all first protection components are distributed in n layers. From bottom to top, the number of first protection components in the nth layer is n, and the first protection component of the next layer and the corresponding two adjacent first protection components of the previous layer are fixed by a second protection component, and the first electrical unit is located within the first protection component. The present invention has the beneficial effects of expandable electrical units, low cost, high laying efficiency, and good protection of the electrical units.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to an expandable multi-core fire-proof and flame-retardant power cable. Background Art

[0002] As people's production and living quality improve, the demand for electricity is increasing.

[0003] Prior art, such as CN117826352A, discloses a modular ribbon optical cable having at least one protective layer and a cable core. The cable core comprises one or more first subunits, each of which includes two assembly components that can be assembled into an I-shaped cross-section. The I-shaped structure has a first cavity and a second cavity, and the first subunits contain multiple optical fiber ribbons. The optical fiber ribbons are distributed in a stacked manner within the first and second cavities, and at least one protective layer is coated around the cable core. The present invention also discloses a butterfly-shaped optical cable and electrical cable.

[0004] The above-mentioned prior art has the following drawbacks: 1. The assembled parts cannot be fixed to each other, so it is not possible to add electrical units after the installation is completed; 2. The mechanical properties are relatively poor. Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present invention is to disclose an expandable multi-core fire-resistant and flame-retardant power cable, which is achieved by adopting the following technical solutions.

[0006] An expandable multi-core fire-retardant power cable comprises an outer sheath, a plurality of first electrical units, (n+1)(n+2) / 2 first protection components and n(n+1) / 2 second protection components, where n≥1, and all first protection components are distributed in n layers, and from bottom to top, the number of first protection components in the nth layer is n;

[0007] The first protection component of the next layer and the two corresponding adjacent first protection components of the previous layer are fixed via a second protection component, and the first electrical unit is located in the first protection component;

[0008] The outer protective layer is located outside the first protective component and the second protective component.

[0009] The expandable multi-core fire-retardant power cable described above, wherein the first protective component is composed of six first protective strips and three first support components, the six first protective strips form a first regular hexagon, the three first support components are located within the first regular hexagon, one end of the three first support components is connected to the center of the first regular hexagon, the angle between two adjacent first support components is 120°, the other ends of the three first support components are respectively connected to a corner of the corresponding first regular hexagon, a first opening is provided at the corner of the first regular hexagon that is not connected to the first support component, and a diamond-shaped first cavity is formed between two adjacent first support components and the corresponding two first protective strips;

[0010] The second protective component is composed of six second protective strips and three second supporting components. The six second protective strips form a second regular hexagon. The three second supporting components are located within the second regular hexagon. One end of the three second supporting components is connected to the center of the second regular hexagon. The angle between two adjacent second supporting components is 120°. The other ends of the three second supporting components are respectively connected to a corner of the corresponding second regular hexagon. A second opening is provided at the corner of the second regular hexagon that is not connected to the second supporting component. A diamond-shaped second cavity is formed between two adjacent second supporting components and the corresponding two second protective strips.

[0011] The first opening of a first protective component of a lower layer and the first openings of two first protective components of an adjacent upper layer point to a common center; the two first protective strips on the upper side of a first protective component of a lower layer respectively overlap and abut against the corresponding first protective strips of two adjacent first protective components of the upper layer; and the adjacent first protective strips of two adjacent first protective components of the same layer overlap and abut against each other;

[0012] The three second support members of the second protective member are respectively inserted into the corresponding first openings pointing to the common center, and the two second protective strips connected to the second support members are located in the corresponding first cavities. The second protective strips are respectively attached to the corresponding first support members, and the ends of the second protective strips not connected to the second support members are respectively against the corresponding first protective strips.

[0013] The second supporting component divides the corresponding first cavity into two electric unit cavities. One first electric unit is arranged in each electric unit cavity, and one second electric unit is arranged in the other first cavity.

[0014] The expandable multi-core fire-retardant power cable described above, wherein the second electrical unit is composed of a second electrical unit sheath, two inner sheaths, and two conductors. The second electrical unit sheath is rhombus-shaped, and the two obtuse angles of the second electrical unit sheath are recessed toward the center. The two inner sheaths are located within the second electrical unit sheath and are respectively located on both sides of the recess. The left inner sheath is connected to the upper recess, and the right inner sheath is connected to the lower recess. A gap in the shape of ∽ is formed between the two inner sheaths and the second electrical unit sheath, and the conductors are respectively located within the corresponding inner sheaths.

[0015] The two acute angles of the second electrical unit sheath are clamped in the two acute angles of the corresponding first cavity, and the four side walls of the second electrical unit sheath are respectively in contact with the four inner walls of the corresponding first cavity.

[0016] In the above-mentioned expandable multi-core fire-retardant power cable, the material of the first protective component is cross-linked polyethylene.

[0017] In the above-mentioned expandable multi-core fire-retardant power cable, the material of the second protective component is cross-linked polyethylene.

[0018] In the expandable multi-core fire-retardant power cable described above, the first electrical unit is composed of a conductor and an insulating layer extruded outside the conductor.

[0019] In the above-mentioned expandable multi-core fire-retardant power cable, the material of the second electrical unit sheath is insulating material.

[0020] The above-mentioned expandable multi-core fire-retardant power cable has a reinforcement component that is a steel belt.

[0021] In the expandable multi-core fire-retardant power cable described above, all the first protection components and the second protection components are provided with an outer protective layer.

[0022] The material of the outer sheath of the expandable multi-core fire-retardant power cable described above is polyethylene.

[0023] In the expandable multi-core fire-retardant power cable described above, a filling component is provided between two adjacent first protective components and the outer sheath, and the material of the filling component is polypropylene.

[0024] In the above-mentioned expandable multi-core fire-retardant power cable, the conductor is made of copper, aluminum, copper alloy or aluminum alloy.

[0025] This application has the following beneficial effects:

[0026] 1. The first protection component and the second protection component can be infinitely expanded, which can increase the power transmission capacity of the cable.

[0027] 2. After the cable has been laid, it can be expanded as needed later without the need to re-lay it, which improves the convenience of cable laying and reduces laying costs.

[0028] 3. The first protection component and the second protection component are fixed to each other by being clipped together, which is convenient for construction. Moreover, the first protection component and the second protection component do not need to be destroyed when the electrical unit is taken out or expanded.

[0029] 4. The first protection component and the second protection component can be recycled and reused, saving resources and protecting the environment.

[0030] 5. The two first electrical units in each first cavity are separated by two layers of first protection strips, and the two first electrical units in two adjacent first cavities are separated by two second protection strips and one first protection strip, which provides better protection for the first electrical units.

[0031] 6. There is a gap between the second electrical unit protective layer and the inner protective layer in the second electrical unit, which improves the impact resistance and heat dissipation performance of the second electrical unit.

[0032] 7. When a reinforcing component is provided in the gap, the compressive performance of the second electrical unit is improved.

[0033] 8. The electric unit cavity outside the first electric unit is triangular in shape, with a more stable structure and better anti-extrusion ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the three-dimensional structure of a section of Example 1 of the present invention.

[0035] Figure 2 This is a front view of embodiment 1 of the present invention.

[0036] Figure 3 This is a front view of the first protective component of Example 1 of the present invention.

[0037] Figure 4 This is a front view of the second protective component of Example 1 of the present invention.

[0038] Figure 5 It is a schematic diagram of the three-dimensional structure of a section of the second electrical unit according to embodiment 1 of the present invention.

[0039] Figure 6 This is a front view of the second electrical unit according to the first embodiment of the present invention.

[0040] Figure 7 It is a schematic diagram of the three-dimensional structure of a section of the second electrical unit according to embodiment 2 of the present invention.

[0041] Figure 8 This is a front view of the second electrical unit according to the second embodiment of the present invention.

[0042] Figure 9 This is a front view of embodiment 3 of the present invention.

[0043] In the figure: 1. Outer protective layer, 2. Filling component, 3. First protective component, 31. First protective strip, 32. First opening, 33. First cavity, 34. First supporting component, 4. Second electrical unit, 41. Second electrical unit protective layer, 42. Gap, 43. Inner protective layer, 44. Conductor, 45. Reinforcement component, 5. Second protective component, 51. Second protective strip, 52. Second opening, 53. Second cavity, 54. Second supporting component, 6. First electrical unit. DETAILED DESCRIPTION

[0044] Example 1: Figures 1 to 6 , an expandable multi-core fire-retardant power cable, having six first electrical units 6 and an outer sheath 1, and also having three first protective components 3 and one second protective component 5;

[0045] The first protective component 3 is composed of six first protective strips 31 and three first support components 34. The six first protective strips 31 form a first regular hexagon. The three first support components 34 are located within the first regular hexagon. One end of the three first support components 34 is connected to the center of the first regular hexagon. The angle between two adjacent first support components 34 is 120°. The other ends of the three first support components 34 are respectively connected to a corner of the corresponding first regular hexagon. A first opening 32 is provided at a corner of the first regular hexagon that is not connected to the first support component 34. A diamond-shaped first cavity 33 is formed between two adjacent first support components 34 and the corresponding two first protective strips 31.

[0046] The second protective component 5 is composed of six second protective strips 51 and three second supporting components 54. The six second protective strips 51 form a second regular hexagon. The three second supporting components 54 are located within the second regular hexagon. One end of the three second supporting components 54 is connected to the center of the second regular hexagon. The angle between two adjacent second supporting components 54 is 120°. The other ends of the three second supporting components 54 are respectively connected to a corner of the corresponding second regular hexagon. A second opening 52 is provided at the corner of the second regular hexagon that is not connected to the second supporting component 54. A diamond-shaped second cavity 53 is formed between two adjacent second supporting components 54 and the corresponding two second protective strips 51.

[0047] The first opening 32 of the lower first protective component 3 and the first openings 32 of the two upper first protective components 3 point to a common center. The adjacent first protective strips 31 of any two adjacent first protective components 3 overlap and abut against each other, and the three first openings 32 point to the common center of the three first protective components 3. The three second support components 54 of the second protective component 5 are respectively inserted into the corresponding first openings 32. The two second protective strips 51 connected to the second support components 54 are located in the corresponding first cavities 33. The second protective strips 51 are respectively abutted against the corresponding first support components 34, and the ends of the second protective strips 51 not connected to the second support components 54 respectively abut against the corresponding first protective strips 31.

[0048] The second supporting member 54 divides the corresponding first cavity 33 into two electrical unit cavities. One first electrical unit 6 is disposed in each electrical unit cavity, and one second electrical unit 4 is disposed in the remaining first cavity 33.

[0049] The second electrical unit 4 is composed of a second electrical unit sheath 41, two inner sheaths 43, and two conductors 44. The second electrical unit sheath 41 is rhombus-shaped, with two obtuse angles of the second electrical unit sheath 41 recessed toward the center of the rhombus. The two inner sheaths 43 are located within the second electrical unit sheath 41, and are located on either side of the recesses. The left inner sheath 43 is connected to the upper recess, and the right inner sheath 43 is connected to the lower recess. A gap 42 in the shape of ∽ is formed between the two inner sheaths 43 and the second electrical unit sheath 41. The conductors 44 are located within the corresponding inner sheaths 43.

[0050] The two acute corners of the second electrical unit sheath 41 are stuck in the two acute corners of the corresponding first cavity 33, and the four side walls of the second electrical unit sheath 41 are respectively in contact with the four inner walls of the corresponding first cavity 33;

[0051] A filling component 2 is provided between two adjacent first protective components 3 and the outer protective layer 1 .

[0052] Example 2: Figure 7 and Figure 8 , and refer to Figures 1 to 4 , an expandable multi-core fire-retardant power cable, this embodiment is basically the same as embodiment 1, except that a reinforcement component 45 is provided in the gap 42 for protecting the inner sheath 43 and the conductor 44.

[0053] Example 3: Figure 9 , and refer to Figures 3 to 6, an expandable multi-core fire-retardant power cable, having fifteen first protection components 3 and ten second protection components 5. From bottom to top, the fifteen first protection components 3 are distributed in five layers, the first layer has one first protection component 3, the second layer has two first protection components 3, the third layer has three first protection components 3, the fourth layer has four first protection components 3, and the fifth layer has five first protection components 3;

[0054] The first protective component 3 is composed of six first protective strips 31 and three first support components 34. The six first protective strips 31 form a first regular hexagon. The three first support components 34 are located within the first regular hexagon. One end of the three first support components 34 is connected to the center of the first regular hexagon. The angle between two adjacent first support components 34 is 120°. The other ends of the three first support components 34 are respectively connected to a corner of the corresponding first regular hexagon. A first opening 32 is provided at a corner of the first regular hexagon that is not connected to the first support component 34. A diamond-shaped first cavity 33 is formed between two adjacent first support components 34 and the corresponding two first protective strips 31.

[0055] The second protective component 5 is composed of six second protective strips 51 and three second supporting components 54. The six second protective strips 51 form a second regular hexagon. The three second supporting components 54 are located within the second regular hexagon. One end of the three second supporting components 54 is connected to the center of the second regular hexagon. The angle between two adjacent second supporting components 54 is 120°. The other ends of the three second supporting components 54 are respectively connected to a corner of the corresponding second regular hexagon. A second opening 52 is provided at the corner of the second regular hexagon that is not connected to the second supporting component 54. A diamond-shaped second cavity 53 is formed between two adjacent second supporting components 54 and the corresponding two second protective strips 51.

[0056] The first opening 32 of a first protective component 3 in a lower layer and the first openings 32 of two first protective components 3 in an adjacent upper layer point to a common center; the two first protective strips 31 on the upper side of a first protective component 3 in a lower layer overlap and abut against the corresponding first protective strips 31 of two adjacent first protective components 3 in the upper layer, and the adjacent first protective strips 31 of two adjacent first protective components 3 in the same layer overlap and abut against each other;

[0057] The first protective component 3 of the next layer and the corresponding two first protective components 3 of the previous layer are fixed by a second protective component 5. The three second support components 54 of the second protective component 5 are respectively inserted into the corresponding first openings 32 pointing to the common center. The two second protective strips 51 connected to the second support components 54 are located in the corresponding first cavities 33. The second protective strips 51 are respectively in contact with the corresponding first support components 34, and the ends of the second protective strips 51 not connected to the second support components 54 are respectively against the corresponding first protective strips 31.

[0058] The second supporting member 54 divides the corresponding first cavity 33 into two electrical unit cavities. One first electrical unit 6 is disposed in each electrical unit cavity, and one second electrical unit 4 is disposed in the remaining first cavity 33.

[0059] The second electrical unit 4 is composed of a second electrical unit sheath 41, two inner sheaths 43, and two conductors 44. The second electrical unit sheath 41 is rhombus-shaped, with two obtuse angles of the second electrical unit sheath 41 recessed toward the center. The two inner sheaths 43 are located within the second electrical unit sheath 41, and are located on either side of the recesses. The left inner sheath 43 is connected to the upper recess, and the right inner sheath 43 is connected to the lower recess. A gap 42 in the shape of ∽ is formed between the two inner sheaths 43 and the second electrical unit sheath 41. The conductors 44 are located within the corresponding inner sheaths 43.

[0060] The two acute corners of the second electrical unit sheath 41 are stuck in the two acute corners of the corresponding first cavity 33 , and the four side walls of the second electrical unit sheath 41 are respectively in contact with the four inner walls of the corresponding first cavity 33 .

[0061] In the above-mentioned expandable multi-core fire-retardant power cable, the material of the first protective component 3 is cross-linked polyethylene.

[0062] In the above-mentioned expandable multi-core fire-retardant power cable, the material of the second protective component 5 is cross-linked polyethylene.

[0063] In the expandable multi-core fire-retardant power cable described above, the first electrical unit 6 is composed of a conductor 44 and an insulating layer extruded outside the conductor 44 .

[0064] In the above-mentioned expandable multi-core fire-retardant power cable, the material of the second electrical unit sheath 41 is insulating material.

[0065] In the above-mentioned expandable multi-core fire-retardant power cable, the outer sheath 1 is made of plastic, preferably plastic with fire-retardant properties.

[0066] In the expandable multi-core fire-retardant power cable described above, the filling component 2 is made of polypropylene.

[0067] In the expandable multi-core fire-retardant power cable described above, the reinforcement component 45 is a steel belt.

[0068] This application has the following beneficial effects:

[0069] 1. The first protection component 3 and the second protection component 5 can be infinitely expanded, which can increase the power transmission capacity of the cable.

[0070] 2. After the cable has been laid, it can be expanded as needed later without the need to re-lay it, which improves the convenience of cable laying and reduces laying costs.

[0071] 3. The first protection component 3 and the second protection component 5 are fixed to each other by being snapped together, which is convenient for construction. Moreover, the first protection component 3 and the second protection component 5 do not need to be destroyed when the electrical unit is taken out or expanded.

[0072] 4. The first protective component 3 and the second protective component 5 can be recycled and reused, saving resources and protecting the environment.

[0073] 5. The two first electrical units 6 in each first cavity 33 are separated by two layers of first protective strips 31, and the two first electrical units 6 in two adjacent first cavities 33 are separated by two second protective strips 51 and one first protective strip 31, which provides better protection for the first electrical units 6.

[0074] 6. There is a gap 42 between the second electrical unit protective layer 41 and the inner protective layer 43 in the second electrical unit 4, which improves the impact resistance and heat dissipation performance of the second electrical unit 4.

[0075] 7. When a reinforcing component 45 is provided in the gap 42 , the compressive resistance of the second electrical unit 4 is improved.

[0076] 8. The electric unit cavity outside the first electric unit 6 is triangular in shape, which has a more stable structure and better anti-extrusion ability.

[0077] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An expandable multi-core fire-retardant power cable having an outer sheath and six first electrical units, characterized in that: It also has three first protection components and one second protection component, the first electrical unit is located inside the first protection component; the outer protective layer is located outside the first protection component and the second protection component; the material of the outer protective layer is plastic with fire retardant function; The first protective component and the second protective component are respectively composed of six protective strips and three supporting components. The six protective strips form a regular hexagon. The three supporting components are located within the regular hexagon. One end of the three supporting components is connected to the center of the regular hexagon. The angle between two adjacent supporting components is 120 degrees. The other ends of the three supporting components are respectively connected to a corner of the corresponding regular hexagon. An opening is provided at the corner of the regular hexagon that is not connected to the supporting component. A diamond-shaped cavity is formed between two adjacent supporting components and the corresponding two protective strips. The opening of a first protective component of a lower layer and the openings of two first protective components of an adjacent upper layer point to a common center; the two upper protective strips of a protective component of a lower layer overlap and abut against the corresponding protective strips of two adjacent first protective components of an adjacent upper layer; and the adjacent protective strips of two adjacent first protective components of the same layer overlap and abut against each other; The three supporting parts of the second protective part are respectively inserted into the corresponding openings of the first protective part pointing to the common center. The two protective strips of the second protective part connected to the supporting parts of the second protective part are located in the corresponding cavities of the first protective part. The protective strips of the second protective part are respectively in contact with the corresponding supporting parts of the first protective part. The ends of the protective strips of the second protective part that are not connected to the supporting parts of the second protective part respectively abut against the corresponding protective strips of the first protective part. The supporting component of the second protective component divides the corresponding cavity of the first protective component into two electrical unit cavities. A first electrical unit is arranged in each electrical unit cavity, and a second electrical unit is arranged in each cavity of the remaining first protective component.

2. The expandable multi-core fire-retardant power cable according to claim 1, characterized in that: The second electrical unit is composed of a second electrical unit protective layer, two inner protective layers and two conductors. The second electrical unit protective layer is diamond-shaped, and the two obtuse angles of the second electrical unit protective layer are recessed toward the center. The two inner protective layers are located within the second electrical unit protective layer and are respectively located on both sides of the recesses. The left inner protective layer is connected to the recess on the upper side, and the right inner protective layer is connected to the recess on the lower side. A gap in the shape of ∽ is formed between the two inner protective layers and the second electrical unit protective layer, and the conductors are respectively located in the corresponding inner protective layers.

3. The expandable multi-core fire-retardant power cable according to claim 2, characterized in that: The two acute corners of the second electrical unit sheath are clamped in the two acute corners of the corresponding first protective component cavity, and the four side walls of the second electrical unit sheath are respectively in contact with the four inner walls of the corresponding first protective component cavity.

4. The expandable multi-core fire-retardant power cable according to claim 3, characterized in that: The first protection member and the second protection member are made of cross-linked polyethylene.

5. The expandable multi-core fire-retardant power cable according to claim 4, characterized in that: The first electrical unit is composed of a conductor and an insulating layer extruded outside the conductor.

6. The expandable multi-core fire-retardant power cable according to claim 5, characterized in that: The material of the second electrical unit sheath is insulating material.

7. The expandable multi-core fire-retardant power cable according to claim 6, characterized in that: The reinforcement component is a steel belt.

8. The expandable multi-core fire-retardant power cable according to claim 7, characterized in that: All the first protection components and the second protection components are provided with an outer protective layer.

9. The expandable multi-core fire-retardant power cable according to claim 8, characterized in that: The material of the conductor is copper, aluminum, copper alloy or aluminum alloy.

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