阅读说明：本技术 一种耐候性变频电力电缆 (Weather resistance frequency conversion power cable ) 是由 朱从林 陆秀国 李正宝 刘芳 王莉莉 于 2021-07-07 设计创作，主要内容包括：本发明涉及电力电缆技术领域,提供一种耐候性变频电力电缆,包括：护套、防水层、加强筋、颗粒缓冲层、阻燃层、滚珠层、膨胀套；电缆设置为多层结构,最外层为滑套；护套内包裹防水层；防水层内部包裹阻燃层；阻燃层内壁上沿圆周分布有多个加强筋；加强筋的轴向与电缆的长度方向平行；加强筋嵌入在颗粒缓冲层内；所述加强筋与阻燃层固定；颗粒填充层的内部包裹滚珠层；滚珠层内部包裹将橡胶滚珠定在膨胀套；滚珠层仅设置在电缆节点处；电缆上沿长度方向每隔米设置一个电缆节点；本发明在受到冷热天气时,通过设置的颗粒缓冲层消除电缆内应力,加强筋保证整体不变形,且滚珠层加强电缆节点处的强度,提高电缆适应季候的性能。(The invention relates to the technical field of power cables, and provides a weather-resistant variable-frequency power cable which comprises: the device comprises a sheath, a waterproof layer, a reinforcing rib, a particle buffer layer, a flame-retardant layer, a ball layer and an expansion sleeve; the cable is arranged in a multilayer structure, and the outermost layer is a sliding sleeve; a waterproof layer is wrapped in the sheath; a flame-retardant layer is wrapped inside the waterproof layer; a plurality of reinforcing ribs are distributed on the inner wall of the flame-retardant layer along the circumference; the axial direction of the reinforcing rib is parallel to the length direction of the cable; the reinforcing ribs are embedded in the particle buffer layer; the reinforcing ribs are fixed with the flame-retardant layer; the inside of the particle filling layer is wrapped with a ball layer; the inside of the ball layer is wrapped to fix the rubber ball in the expansion sleeve; the ball layer is only arranged at the cable node; arranging cable nodes on the cable every other meter along the length direction; when the cable is subjected to cold and hot weather, the internal stress of the cable is eliminated through the arranged particle buffer layer, the reinforcing ribs ensure that the whole cable is not deformed, and the strength of the ball layer at the joint of the cable is enhanced, so that the performance of the cable adapting to seasons is improved.)

1. A weatherable variable frequency power cable, comprising: the device comprises a sheath, a waterproof layer, a reinforcing rib, a particle buffer layer, a flame-retardant layer, a ball layer and an expansion sleeve; the cable is of a multilayer structure, and the outermost layer is a sliding sleeve; a waterproof layer is wrapped in the sheath; a flame-retardant layer is wrapped inside the waterproof layer; a plurality of reinforcing ribs are distributed on the inner wall of the flame-retardant layer along the circumference; the axial direction of the reinforcing rib is parallel to the length direction of the cable; the reinforcing ribs are embedded in the particle buffer layer; the reinforcing ribs are fixed with the flame-retardant layer; the inside of the particle filling layer is wrapped with a ball layer; the inside of the ball layer is wrapped with a rubber ball fixed on the expansion sleeve; the ball layer is only arranged at the cable node; and cable nodes are arranged on the cable every other meter along the length direction.

2. The weatherable, variable frequency power cable of claim 1, wherein a filler material is wrapped within the expansion jacket; a plurality of anti-abrasion sleeves are uniformly distributed in the filling material along the axis of the cable; the cable branch is wrapped in the anti-abrasion sleeve; tensile ropes are axially distributed in the filling material along the axis of the cable; the tensile rope and the wear-resistant sleeve are distributed at intervals.

3. The weatherable, variable frequency power cable of claim 1, wherein a support assembly is disposed within the cable that supports the interior or exterior of the cable.

4. The weatherable, variable frequency power cable of claims 1-3, wherein the support assembly comprises support posts, support ribs; a support column is embedded in the center of the cable along the axis; the supporting column extends towards the expansion sleeve to form a plurality of supporting ribs which are uniformly distributed along the axial direction of the supporting column; the ends of the support ribs support the inside or outside of the column cable.

5. The weatherable, variable frequency power cable of claim 4, wherein the brace bar passes through a gap between adjacent tensile strands and wear sleeves, and has a support plate secured to an end thereof; the plate surface of the supporting plate is abutted against the inner wall of the expansion sleeve.

6. The weatherable, variable frequency power cable of claim 5, wherein the support plate is an arcuate plate; the outer diameter of the supporting plate is equal to the inner diameter of the expansion sleeve.

7. The weather-resistant variable frequency power cable according to claim 4, wherein the supporting rib passes through the expansion sleeve, the ball layer, the particle buffer layer, the flame retardant layer, the waterproof layer and the sheath in sequence, and a pull-back plate is fixed at the end of the supporting rib; the inner wall of the return plate contacts the outer wall of the jacket and applies an inward compressive force to the jacket.

8. The weatherable, variable frequency power cable of claim 7, wherein the pullback plate is an arcuate plate and an inner diameter of the pullback plate is equal to an outer diameter of the jacket.

9. The weatherable, variable frequency power cable of claim 1, wherein said particle buffer layer is filled with plastic particles having a particle size of less than 100 microns.

10. The weatherable variable frequency power cable according to claim 1, wherein the inside of the ball layer is filled with rubber balls having a diameter of 1-2 cm.

Technical Field

The invention relates to the technical field of power cables, in particular to a weather-resistant variable-frequency power cable.

Background

The existing cables are generally divided into: power cables, control cables, compensation cables, shielded cables, high temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, and the like; the cable is usually rope-like in structure and is formed by twisting several or groups of wires (at least two in each group); each set of conductors within the same cable is insulated from each other and is often twisted around a center, with the outermost layer of the twisted unit being coated with a highly insulating coating. The cable in the prior art has the characteristics of internal electrification and external insulation. The existing variable frequency power cable is poor in weather resistance, poor in using effect and short in service life in regions with clear four seasons. The main reasons are that the cable is affected by thermal expansion and cooling in different areas and humidity, and the structural stability inside the cable is poor, so that the service life of the cable is short. Patent No. CN109102926A discloses a fire-resistant and moisture-proof cable for subways. Including the cable body, the waterproof layer, fire-retardant layer, support the cover, cable branch line and coupling assembling, the cable body sets up to multilayer structure, and the outmost sheath that sets up of cable body, the coating has the waterproof layer in the sheath, and the coating has fire-retardant layer in the waterproof layer, be provided with a plurality of support covers in the fire-retardant layer, the support cover sets up to the equidistance range in the fire-retardant layer, and be provided with fire-retardant filling layer between the adjacent support cover, be provided with many cable branch lines in the fire-retardant layer, and many cable branch lines wear to locate respectively and support cover and fire-retardant in situ middle part, the cable branch line includes the dampproof course, the insulating layer with lead the core. Inside the effectual water infiltration cable of preventing, protected the inner structure of this cable, and the dampproof course that sets up in the cable branch line prevents that steam from corroding the guide core, and influences the normal operating of circuit, has further protected the security of cable. However, in the above patent, it is difficult to adapt to the characteristics of different seasons, such as the cable is difficult to maintain an optimum state under different conditions of heat, dryness, humidity, low temperature, etc. Although the above patent documents have weather resistance to some extent, the weather resistance still has some drawbacks.

Therefore, it is necessary to develop a weather-resistant variable frequency power cable for solving at least one of the above technical problems.

Disclosure of Invention

The invention aims to provide a variable frequency power cable with good weather resistance.

The above object of the present invention can be achieved by the following technical solutions:

the invention provides a weather-resistant variable frequency power cable, which comprises: the device comprises a sheath, a waterproof layer, a reinforcing rib, a particle buffer layer, a flame-retardant layer, a ball layer and an expansion sleeve; the cable is of a multilayer structure, and the outermost layer is a sliding sleeve; a waterproof layer is wrapped in the sheath; a flame-retardant layer is wrapped inside the waterproof layer; a plurality of reinforcing ribs are distributed on the inner wall of the flame-retardant layer along the circumference; the axial direction of the reinforcing rib is parallel to the length direction of the cable; the reinforcing ribs are embedded in the particle buffer layer; the reinforcing ribs are fixed with the flame-retardant layer; the inside of the particle filling layer is wrapped with a ball layer; the inside of the ball layer is wrapped with a rubber ball fixed on the expansion sleeve; the ball layer is only arranged at the cable node; and cable nodes are arranged on the cable every other meter along the length direction.

This cable is equipped with fire-retardant layer, the waterproof layer, the effectual condition of avoiding intaking and spontaneous combustion takes place, and compare in traditional cable and still be provided with the granule buffer layer, prevent that external impact force from causing the damage to the cable, the inside strengthening rib that sets up of cable in addition, also can prevent to receive the cracked condition of external force emergence, and set up the ball layer at the cable node, the steadiness of effectual protection cable node, when receiving cold and hot weather, eliminate the cable internal stress through foretell granule buffer layer, the strengthening rib guarantees wholly indeformable, the ball layer adds the intensity of cable node, improve the performance that the cable adapts to the season.

Preferably, the expansion sleeve is wrapped with a filling material; a plurality of anti-abrasion sleeves are uniformly distributed in the filling material along the axis of the cable; the cable branch is wrapped in the anti-abrasion sleeve; tensile ropes are axially distributed in the filling material along the axis of the cable; the tensile rope and the wear-resistant sleeve are distributed at intervals.

It is spacing with the ball layer through the expansion sleeve, prevent that the ball from entering into in the cable is inside to improve the stretching resistance of cable through setting up the stretch-proofing rope.

Preferably, a support assembly is provided within the cable to support the inside or outside of the cable. The internal and external supporting force of the cable is improved, and deformation is prevented.

Preferably, the support assembly comprises a support column and a support rib; a support column is embedded in the center of the cable along the axis; the supporting column extends towards the expansion sleeve to form a plurality of supporting ribs which are uniformly distributed along the axial direction of the supporting column; the ends of the support ribs support the inside or outside of the column cable.

When the cable expands with heat and contracts with cold, the inner and outer parts of the cable are supported through the tail ends of the supporting ribs, and the cable is prevented from deforming.

Preferably, the supporting rib passes through a gap between the adjacent tensile rope and the wear-resistant sleeve, and a supporting plate is fixed at the end part of the supporting rib; the plate surface of the supporting plate is abutted against the inner wall of the expansion sleeve.

When the cable is cooled, the cable is wholly compressed inwards, inward extrusion force of the expansion sleeve is received by the supporting plate, the extrusion force is transmitted to the central column by the supporting plate through the supporting ribs, and the extrusion force is offset in the central column due to the fact that the supporting ribs are circumferentially and uniformly distributed, so that the cable is guaranteed not to deform, and the stability of the interior of the cable is improved.

Preferably, the support plate is an arc-shaped plate; the outer diameter of the supporting plate is equal to the inner diameter of the expansion sleeve. Is convenient to contact with the expansion sleeve, improves the contact area and further bears the cold contraction force in a large area.

Preferably, the supporting rib sequentially penetrates through the expansion sleeve, the ball layer, the particle buffer layer, the flame-retardant layer, the waterproof layer and the sheath, and a pull-back plate is fixed at the end part of the supporting rib; the inner wall of the return plate contacts the outer wall of the jacket and applies an inward compressive force to the jacket.

When the cable is heated and expanded, the pull-back plate gives an inward pressure to the sheath, so that the cable is prevented from being deformed, the shape of the cable is kept, and the stability in the cable is improved.

Preferably, the pulling back plate is an arc plate, and the inner diameter of the pulling back plate is equal to the outer diameter of the sheath. The contact area of the pulling plate and the sheath is increased, and the large-area expansion force is borne.

Preferably, the particle buffer layer is filled with plastic particles with the particle size of less than 100 microns. The buffer force is convenient to increase.

Preferably, the ball layer is internally filled with rubber balls with the diameter of 1-2 cm. The strength at the cable node is conveniently improved.

The invention has the characteristics and advantages that:

A. when the cable is subjected to cold and hot weather, the internal stress of the cable is eliminated through the arranged particle buffer layer, the reinforcing rib ensures that the whole cable is not deformed, the strength of the joint of the cable is enhanced through the ball layer, and the seasonal adaptability of the cable is improved;

B. the ball layer is limited through the arranged expansion sleeve, so that balls are prevented from entering the inside of the cable, and the tensile resistance of the cable is improved through the arrangement of the tensile resistance rope; when the cable expands with heat and contracts with cold, the inner part and the outer part of the cable are supported through the tail ends of the supporting ribs, so that the cable is prevented from deforming; when the cable is cooled, the cable is integrally compressed inwards, the supporting plate receives an inward extrusion force of the expansion sleeve, the supporting plate transmits the extrusion force to the central column through the supporting ribs, and the extrusion force is offset at the central column due to the fact that the supporting ribs are uniformly distributed in the circumferential direction, so that the cable is guaranteed not to deform, and the stability of the interior of the cable is improved; when the cable is heated and expanded, the pull-back plate gives an inward pressure to the sheath, so that the cable is prevented from being deformed, the shape of the cable is kept, and the stability in the cable is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a node of a medium frequency conversion power cable according to an embodiment of the present invention;

fig. 2 is a sectional view of a node of a variable frequency power cable according to a second embodiment of the present invention;

fig. 3 is a sectional view of a node of a variable frequency power cable according to a third embodiment of the present invention;

fig. 4 is a front view of a variable frequency power cable according to a third embodiment of the present invention.

The reference numbers illustrate:

1. a sheath; 2. a waterproof layer; 3. reinforcing ribs; 4. a particle buffer layer; 5. a flame retardant layer; 6. a ball layer; 7. an expansion sleeve; 8. a tensile strand; 9. an anti-wear sleeve; 10. a cable branch; 11. a support plate; 12. supporting ribs; 13. a central column; 14. and (5) pulling back the plate.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

as shown in fig. 1, the present invention provides a weather-resistant variable frequency power cable, comprising: sheath 1, waterproof layer 2, strengthening rib 3, granule buffer layer 4, fire-retardant layer 5, ball layer 6, inflation cover 7, stretch-proofing rope 8, abrasionproof cover 9 and cable branch line 10. The cable is arranged to be of a multilayer structure, and the outermost layer is a sliding sleeve 1. The waterproof layer 2 is wrapped in the sheath 1. The waterproof layer 2 is internally wrapped with a flame-retardant layer 5.

Preferably, in one preferable technical solution of this embodiment, a plurality of reinforcing ribs 3 are circumferentially distributed on an inner wall of the flame retardant layer 5. The axial direction of the reinforcing ribs 3 is parallel to the length direction of the cable. The reinforcing ribs 3 are embedded in the particle buffer layer 4. I.e. the particle buffer layer 4 is filled with plastic particles with the particle size of less than 100 microns. And the reinforcing ribs 3 and the inner wall of the flame-retardant layer 5 are integrally formed.

Preferably, in one preferred technical solution of this embodiment, the inside of the particle filling layer 4 is wrapped by the ball layer 6. The ball layer is only arranged at the cable node. And cable nodes are arranged on the cable every 1 m along the length direction. The ball layer 6 is filled with rubber balls with the diameter of 1-2 cm.

Preferably, in one preferable technical solution of the present embodiment, the ball layer 6 is internally wrapped to fix the rubber ball to the expansion sleeve 7.

Preferably, in one preferred technical solution of the present embodiment, the expansion sleeve 7 is wrapped with a filling material. And a plurality of anti-abrasion sleeves 9 are uniformly distributed in the filling material along the axis of the cable. The cable branch 10 is wrapped in the wear-resistant sleeve 9. Tensile ropes 8 are axially distributed in the filling material along the axis of the cable. And the tensile ropes 8 and the wear-resistant sleeves 9 are distributed at intervals.

The working principle is as follows: this cable is equipped with fire-retardant layer 5, waterproof layer 2, the effectual condition of avoiding intaking and spontaneous combustion takes place, and compare in traditional cable still to be provided with granule buffer layer 4, prevent that external impact force from causing the damage to the cable, the inside strengthening rib 3 that sets up of cable in addition, also can prevent to receive the cracked condition of external force emergence, and set up ball layer 6 at the cable node, the steadiness of effectual protection cable node, it is spacing with ball layer 6 through expansion sleeve 7, prevent that the ball from entering into filling material, and improve the stretching resistance of cable through setting up stretch-proofing rope 8, when receiving cold and hot weather, eliminate the cable internal stress through foretell granule buffer layer 4, strengthening rib 3 guarantees wholly indeformable, the intensity of 6 reinforced cable nodes in ball layer, improve the performance that the cable adapts to the season.

Example two:

as shown in fig. 2, in this embodiment, on the basis of embodiment 1, a supporting column 13 is embedded in the center of the filling material along the axial center. The supporting column 13 extends towards the expansion sleeve 7 to form a plurality of supporting ribs 12 which are uniformly distributed along the axial direction of the supporting column 13. The supporting rib 12 passes through the gap between the adjacent tensile rope 8 and the wear-resistant sleeve 9, and the end part is fixed with an integrally formed supporting plate 11. The surface of the supporting plate 11 is pressed against the inner wall of the expansion sleeve 7.

Preferably, in one preferable technical solution of the present embodiment, the support plate 11 is an arc-shaped plate. And the outer diameter of the support plate 11 is equal to the inner diameter of the expansion sleeve 7.

When the cable is cooled, the cable is wholly compressed inwards, the supporting plate 11 receives inward extrusion force of the expansion sleeve 7, the supporting plate 11 transmits the extrusion force to the central column 13 through the supporting ribs 12, and the extrusion force is offset at the central column 13 due to the circumferential uniform distribution of the supporting ribs 12, so that the deformation of the cable is avoided, and the stability of the inside of the cable is improved.

Example three:

as shown in fig. 3 and 4, unlike the second embodiment, the supporting rib 12 passes through the expansion sleeve 7, the ball layer 6, the particle buffer layer 4, the flame retardant layer 5, the waterproof layer 2 and the sheath 1 in sequence, and the end of the supporting rib 12 is fixed with the pulling back plate 14. The inner wall of the return plate 14 contacts the outer wall of the jacket 1 and applies an inward pressing force to the jacket 1.

Preferably, in one preferable technical solution of this embodiment, the pulling back plate 14 is an arc plate, and an inner diameter of the pulling back plate 14 is equal to an outer diameter of the sheath 1.

When the cable is heated and expanded, the pull-back plate 14 gives an inward pressure to the sheath 1, so that the cable is prevented from being deformed, the shape of the cable is maintained, and the stability in the cable is improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.