CN111785434B - Heat dissipation type 5G cable - Google Patents
Heat dissipation type 5G cable Download PDFInfo
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- CN111785434B CN111785434B CN202010654775.6A CN202010654775A CN111785434B CN 111785434 B CN111785434 B CN 111785434B CN 202010654775 A CN202010654775 A CN 202010654775A CN 111785434 B CN111785434 B CN 111785434B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1875—Multi-layer sheaths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/221—Longitudinally placed metal wires or tapes
- H01B7/223—Longitudinally placed metal wires or tapes forming part of a high tensile strength core
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/22—Metal wires or tapes, e.g. made of steel
- H01B7/228—Metal braid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/428—Heat conduction
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Abstract
The invention discloses a heat dissipation type 5G cable, which belongs to the technical field of cables and comprises an inner sheath, cable cores, through holes, polyethylene protective layers, wires and insulating layers, wherein the inner sheath is arranged inside the cable, the cable cores are arranged inside the inner sheath at equal intervals, the through holes for the corresponding cable cores to penetrate through are formed inside the inner sheath, each cable core comprises a wire and an insulating layer coated outside the wire, the polyethylene protective layers are arranged on the outermost part of the cable, the inner sheath is arranged in an annular structure, a metal reinforcing column is arranged at the circle center of the inner sheath, and a metal woven layer is sleeved outside the inner sheath. According to the cable core, the plurality of first annular communicating grooves on the metal weaving layer are communicated with the strip-shaped notches, so that the metal weaving layer can uniformly adsorb heat to the cable core, the heat conduction effect of the metal weaving layer is improved, and the influence on the use safety of the cable caused by high temperature of the cable core due to long-time work of most conventional cables is avoided.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a heat dissipation type 5G cable.
Background
The cable is generally a cable similar to a rope formed by stranding a plurality of or a plurality of groups of wires, each group of wires are mutually insulated and are usually twisted around a center, the whole outer surface is wrapped with a highly-insulated covering layer, and the application field of the 5G cable is continuously expanded along with the continuous development of the power technology, so that the innovation and the design of the 5G cable are carried out, and the development of the 5G cable production technology is promoted
The existing majority of 5G cables have poor heat dissipation performance, so that cable cores inside the cables cannot be conducted out in time under long-term work, and the use safety of the cable cores is affected, so that the heat dissipation type 5G cables are urgently needed to be developed.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to provide a heat dissipation type 5G cable, which aims to solve the problem that due to poor heat dissipation performance of most of the existing 5G cables in the background art, a large amount of heat cannot be conducted out in time when a cable core in the cable works for a long time, and the use safety of the cable core is affected.
2. Technical scheme
In order to solve the problems, the invention adopts the following technical scheme:
a heat dissipation type 5G cable comprises an inner sheath, cable cores, through holes, polyethylene protective layers, wires and insulating layers, wherein the inner sheath is arranged inside the cable, the cable cores are arranged inside the inner sheath at equal intervals, the through holes for the corresponding cable cores to penetrate through are formed inside the inner sheath, each cable core comprises the wires and the insulating layers coated outside the wires, the polyethylene protective layers are arranged outside the cable, the inner sheath is arranged in an annular structure, metal reinforcing columns are arranged at the circle centers of the inner sheath, the outer wall surfaces of the metal reinforcing columns are tightly attached to the inner wall surfaces of the inner sheath, metal woven layers are sleeved outside the inner sheath, the inner wall surfaces of the metal woven layers are tightly attached to the outer wall surfaces of the inner sheath, the polyethylene protective layers are sleeved outside the metal woven layers, and at least two strip-shaped notches are formed in the through holes, and wherein two bar notches on every through-hole all are located the radial direction of inner sheath, every equal symmetry is equipped with two sets of outer intercommunicating pores on the through-hole being close to the bar notch of metallic braid one side, and the impartial interval's of outer intercommunicating pore of every group distributes on corresponding bar notch to the outside intercommunication of outer intercommunicating pore and inner sheath, equidistant second annular intercommunication groove that is equipped with and communicates with corresponding bar notch on the peripheral border of insulating layer, and second annular intercommunication groove and outer intercommunicating pore one-to-one and align, equidistant first annular intercommunication groove of having seted up on the inner circle lateral wall of metallic braid, and first annular intercommunication groove and outer intercommunicating pore one-to-one and align, and every first annular intercommunication groove all communicates with corresponding outer intercommunicating pore.
Preferably, the metal braid and the metal reinforcing column are both made of high-strength aluminum alloy material, and the inner sheath is made of rubber or other elastic material.
Preferably, the cross section of each strip-shaped notch is of a triangular structure, and the vertex of an included angle between two isosceles side edges of each strip-shaped notch faces back to the cable core.
Preferably, the width values of the notches of the first annular communication groove and the second annular communication groove are both larger than the aperture value of the corresponding side outer communication hole.
Preferably, two sets of interconnection through holes are symmetrically arranged on each through hole on the strip-shaped notch close to one side of the metal reinforcing column, the interconnection through holes on each set of interconnection through holes are distributed on the corresponding strip-shaped notches at equal intervals, the interconnection through holes are communicated with the inside of the inner sheath, third annular communication grooves are arranged on the peripheral circumference of the metal reinforcing column at equal intervals, the third annular communication grooves correspond to and align with the interconnection through holes one to one, each third annular communication groove is communicated with the corresponding interconnection through hole, and the width value of the notch of each third annular communication groove is larger than the aperture value of the corresponding side communication hole.
Preferably, the inner sheath is provided with at least two communication holes along the circumference thereof, each communication hole is communicated with the inner side and the outer side of the inner sheath, two ends of each communication hole respectively correspond to a third annular communication groove and a first annular communication groove, and each third annular communication groove is communicated with the corresponding first annular communication groove through the communication hole.
3. Advantageous effects
1. The invention can transmit the heat around the cable core into the strip-shaped notch communicated with the external communication hole through the second annular communication groove and transmit the heat in the strip-shaped notch into the first annular communication groove through the external communication hole through the communication arrangement between the strip-shaped notch and the second annular communication groove, thereby absorbing the heat in the first annular communication groove through the metal braid layer made of high-strength aluminum alloy material so as to improve the flow speed of the heat around the cable core, thereby achieving the effect of heat dissipation, and the arrangement that the plurality of first annular communicating grooves on the metal braiding layer are communicated with the strip-shaped notches enables the metal braiding layer to absorb the heat of the cable core more uniformly, the heat conduction effect of the metal braided layer is improved, and the influence on the use safety of the cable caused by the fact that the temperature of the cable core is higher due to long-time work of the existing cables is avoided.
2. According to the invention, the flexibility of the cable which generates deformation is enhanced by matching the cable with the flexibility of the metal woven layer and the metal reinforcing column, and the inner side and the outer side of the cable can be simultaneously reinforced and protected by arranging the metal woven layer and the metal reinforcing column, so that the endurance performance of the cable is enhanced, and when the cable is extruded, the cable core inside the cable is buffered and protected by the deformation generated by the inner sheath, so that the influence of external force on the cable core is reduced.
3. The arrangement of the strip-shaped notch can provide a deformation buffering margin for the inner sheath when the cable is extruded, so that the cable generates a deformation effect through the strip-shaped notch when the cable is extruded, the extrusion force is less acted on the cable core, the buffering effect of the inner sheath is enhanced, and the triangular structure is arranged, so that the cable has stronger stability through the triangle when the extrusion force disappears, the deformation recovery capability of the inner sheath is enhanced, and the time for the cable to recover from deformation is effectively shortened.
4. The strip-shaped notch is communicated with the third annular communication groove through the inner connecting through hole, so that heat dissipation can be performed on one side, close to the metal reinforcing column, of the cable core, the strip-shaped notch is communicated with the first annular communication groove and the third annular communication groove through the second annular communication groove, the space where heat around the cable core flows in the cable is enlarged, the metal reinforcing column and the metal weaving layer can absorb heat generated by the cable core at the same time, and the heat dissipation efficiency of the cable core is improved.
5. According to the invention, the third annular communicating groove is communicated with the first annular communicating groove, so that the flowing space of heat around the cable core in the cable is further increased, and the metal reinforcing columns and the metal braided layers made of metal can uniformly absorb the heat through the fluidity of air, so that the heat dissipation efficiency of the cable core is further improved.
Drawings
FIG. 1 is a schematic front view of the internal structure of the present invention;
FIG. 2 is a schematic diagram of an external structure of an insulating layer and a metal reinforcing column;
FIG. 3 is a schematic view of the inner sheath;
FIG. 4 is a schematic structural view of a metal braid;
FIG. 5 is a schematic diagram of the internal structure of the cable core;
fig. 6 is an enlarged schematic view of a portion a in fig. 1.
Reference numerals: 1-inner sheath, 2-cable core, 3-through hole, 4-polyethylene protective layer, 5-metal braided layer, 6-strip notch, 7-outer communicating hole, 8-first annular communicating groove, 9-conducting wire, 10-insulating layer, 11-second annular communicating groove, 12-metal reinforcing column, 13-third annular communicating groove, 14-communicating hole and 15-inner communicating hole.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Examples
As shown in fig. 1-6, a heat dissipation type 5G cable comprises an inner sheath 1, a cable core 2, through holes 3, polyethylene protective layers 4, a wire 9 and an insulating layer 10, wherein the inner sheath 1 is arranged inside the cable, the cable core 2 is arranged inside the inner sheath 1 at equal intervals, the through holes 3 for the corresponding cable cores 2 to pass through are arranged inside the inner sheath 1, the cable core 2 comprises the wire 9 and the insulating layer 10 covering the outside of the wire 9, the polyethylene protective layer 4 is arranged on the outermost portion of the cable, the inner sheath 1 is arranged in an annular structure, a metal reinforcing column 12 is arranged at the center of the circle of the inner sheath 1, the outer wall surface of the metal reinforcing column 12 is tightly attached to the inner wall surface of the inner sheath 1, a metal woven layer 5 is sleeved outside the inner sheath 1, the inner wall surface of the metal woven layer 5 is tightly attached to the outer wall surface of the inner sheath 1, and the polyethylene protective layer 4 is sleeved outside the metal woven layer 5, the metal braid 5 and the metal reinforcing column 12 are both made of high-strength aluminum alloy materials, the inner sheath 1 is made of rubber or other elastic materials, the flexibility of the cable which generates deformation is matched through the flexibility of the metal braid 5 and the flexibility of the metal reinforcing column 12, so that the flexibility of the cable is enhanced, and the inner side and the outer side of the cable can be simultaneously protected through the metal braid 5 and the metal reinforcing column 12, so that the endurance performance of the cable is enhanced, when the cable is extruded, the cable core 2 in the cable can be protected in a buffering mode through the deformation generated by the inner sheath 1, and the influence of external force on the cable core 2 is reduced;
at least two strip-shaped notches 6 are arranged on each through hole 3, two strip-shaped notches 6 on each through hole 3 are positioned in the radial direction of the inner sheath 1, the cross section of each strip-shaped notch 6 is in a triangular structure, and the included angle vertex of the isosceles two side edges of each strip-shaped notch 6 is arranged back to the cable core 2, the arrangement of the strip-shaped notches 6 can provide a deformation buffering margin for the inner sheath 1 when being extruded, thereby leading the cable to generate the deformation effect through the strip-shaped notch 6 when being extruded, leading the extrusion force to be less acted on the cable core 2, thereby enhancing the buffering effect of the inner sheath 1, and when the extrusion force of the cable disappears through the arrangement of the triangular structure, the triangular cable has stronger stability, and the deformation recovery capability of the inner sheath 1 is enhanced, so that the deformation recovery time of the cable is effectively shortened;
two groups of outer communication holes 7 are symmetrically arranged on the strip-shaped notch 6 on one side of each through hole 3 close to the metal woven layer 5, the outer communication holes 7 on each group of outer communication holes 7 are distributed on the corresponding strip-shaped notch 6 at equal intervals, the outer communication holes 7 are communicated with the outside of the inner sheath 1, second annular communication grooves 11 communicated with the corresponding strip-shaped notches 6 are arranged on the peripheral circumference of the insulating layer 10 at equal intervals, the second annular communication grooves 11 are in one-to-one correspondence and alignment with the outer communication holes 7, first annular communication grooves 8 are arranged on the inner ring side wall of the metal woven layer 5 at equal intervals, the first annular communication grooves 8 are in one-to-one correspondence and alignment with the outer communication holes 7, each first annular communication groove 8 is communicated with the corresponding outer communication hole 7, and the width values of the notches of the first annular communication grooves 8 and the second annular communication grooves 11 are larger than the aperture value of the outer communication holes 7 on the corresponding side, the size of the annular communicating groove and the outer communicating hole 7 is set, so that the annular communicating groove can sufficiently contain heat transmitted inside the outer communicating hole 7, and the adsorption effect of the metal woven layer 5 on the heat is improved through the flow of the heat in the annular communicating groove;
two groups of interconnection through holes 15 are symmetrically arranged on the strip-shaped notch 6 on one side, close to the metal reinforcing column 12, of each through hole 3, the interconnection through holes 15 on each group of interconnection through holes 15 are distributed on the corresponding strip-shaped notch 6 at equal intervals, the interconnection through holes 15 are communicated with the inside of the inner sheath 1, third annular communication grooves 13 are arranged on the peripheral circumference of the metal reinforcing column 12 at equal intervals, the third annular communication grooves 13 are in one-to-one correspondence and alignment with the interconnection through holes 15, each third annular communication groove 13 is communicated with the corresponding interconnection through hole 15, the width of the notch of each third annular communication groove 13 is larger than the aperture value of the corresponding communication hole 15, the strip-shaped notch 6 is communicated with the third annular communication groove 13 through the interconnection through holes 15, heat dissipation can be carried out on one side, close to the metal reinforcing column 12, of the cable core 2, and the strip-shaped notch 6 is communicated with the first annular communication groove 8 through the second annular communication groove 11, The third annular communicating grooves 13 are communicated with each other, so that the space for heat around the cable core 2 to flow in the cable is increased, the metal reinforcing columns 12 and the metal braiding layers 5 can absorb the heat generated by the cable core 2 at the same time, and the heat dissipation efficiency of the cable core 2 is improved;
be equipped with the intercommunicating pore 14 that the number is two at least along its periphery on the inner sheath 1, and every intercommunicating pore 14 all with the inner of inner sheath 1, outer both sides intercommunication, and the both ends of intercommunicating pore 14 correspond a third annular intercommunication groove 13 and first annular intercommunication groove 8 respectively, every third annular intercommunication groove 13 all communicates with corresponding first annular intercommunication groove 8 through intercommunicating pore 14, the setting of third annular intercommunication groove 13 and first annular intercommunication groove 8 intercommunication, further increase the heat in the inside flow space of cable around cable core 2, through the mobility of air, make metal reinforcement column 12 and the metal braid 5 of being made by the metal can be comparatively even adsorb the heat, with this further radiating efficiency that has improved cable core 2.
The specific application process of the heat dissipation type 5G cable is as follows: when the cable is used, the strip-shaped notch 6 is communicated with the second annular communication groove 11, so that heat around the cable core 2 can be transmitted into the strip-shaped notch 6 communicated with the outer communication hole 7 through the second annular communication groove 11, and the heat in the strip-shaped notch 6 is transmitted into the first annular communication groove 8 through the outer communication hole 7, so that the heat in the first annular communication groove 8 can be absorbed through the metal weaving layer 5 made of a high-strength aluminum alloy material, the flowing speed of the heat around the cable core 2 is improved, and the heat dissipation effect is achieved;
during heat dissipation, the strip-shaped notch 6 is communicated with the third annular communicating groove 13 through the inner connecting through hole 15, and one side, close to the metal reinforcing column 12, of the cable core 2 is subjected to heat dissipation, so that the strip-shaped notch 6 is communicated with the first annular communicating groove 8 and the third annular communicating groove 13 through the second annular communicating groove 11, and a space for heat around the cable core 2 to flow in the cable is enlarged, so that the metal reinforcing column 12 and the metal weaving layer 5 can absorb heat generated by the cable core 2 at the same time, and the heat dissipation efficiency of the cable core 2 is improved;
during heat dissipation, the third annular communicating groove 13 is communicated with the first annular communicating groove 8, so that the flowing space of heat around the cable core 2 in the cable is further increased, and the metal reinforcing columns 12 and the metal woven layers 5 made of metal can uniformly absorb the heat through the fluidity of air, so that the heat dissipation efficiency of the cable core 2 is further improved;
when this cable receives the extrusion, the setting through bar notch 6 can be for the inner sheath 1 when being extruded provides the surplus of a deformation buffering, thereby make the cable produce the effect of deformation through bar notch 6 when being extruded, make the less effect of extrusion force on cable core 2, with this buffering effect that has strengthened inner sheath 1, and the setting through triangle-shaped structure, make this cable when the extrusion force disappears, have stronger stability through the triangle-shaped, the ability that 1 deformation of reinforcing inner sheath resumes, thereby the effectual time that this cable deformation resumes, the use of this heat dissipation type 5G cable has just been accomplished like this.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (5)
1. A heat dissipation type 5G cable comprises an inner sheath (1), a cable core (2), through holes (3), polyethylene protective layers (4), a wire (9) and insulating layers (10), wherein the inner sheath (1) is arranged inside the cable, the cable core (2) is arranged inside the inner sheath (1) at equal intervals, the through holes (3) for the corresponding cable cores (2) to pass through are formed in the inner sheath (1), the cable core (2) comprises the wire (9) and the insulating layers (10) coated outside the wire (9), the polyethylene protective layers (4) are arranged on the outermost portion of the cable, the heat dissipation type 5G cable is characterized in that the inner sheath (1) is of an annular structure, metal reinforcing columns (12) are arranged at the circle centers of the inner sheath (1), the outer wall surfaces of the metal reinforcing columns (12) are tightly attached to the inner wall surfaces of the inner sheath (1), and metal woven layers (5) are sleeved outside the inner sheath (1), and the inner wall surface of the metal braiding layer (5) is closely attached to the outer wall surface of the inner sheath (1), the polyethylene protective layer (4) is sleeved outside the metal braiding layer (5), each through hole (3) is provided with at least two strip-shaped notches (6), two strip-shaped notches (6) on each through hole (3) are positioned in the radial direction of the inner sheath (1), two groups of outer communication holes (7) are symmetrically arranged on the strip-shaped notches (6) on one side, close to the metal braiding layer (5), of each through hole (3), the outer communication holes (7) on each group of outer communication holes (7) are distributed on the corresponding strip-shaped notches (6) at equal intervals, the outer communication holes (7) are communicated with the outside of the inner sheath (1), the peripheral circumference of the insulating layer (10) is provided with second annular communication grooves (11) communicated with the corresponding strip-shaped notches (6) at equal intervals, the second annular communication grooves (11) are in one-to-one correspondence and alignment with the outer communication holes (7), the side wall of the inner ring of the metal woven layer (5) is provided with first annular communication grooves (8) at equal intervals, the first annular communication grooves (8) are in one-to-one correspondence and alignment with the outer communication holes (7), each first annular communication groove (8) is communicated with the corresponding outer communication hole (7), two groups of inner connection through holes (15) are symmetrically arranged on the strip-shaped notch (6) on one side, close to the metal reinforcing column (12), of each through hole (3), the inner connection through holes (15) on each group of inner connection through holes (15) are distributed on the corresponding strip-shaped notch (6) at equal intervals, the inner connection through holes (15) are communicated with the inside of the inner sheath (1), the peripheral circumference of the metal reinforcing column (12) is provided with third annular communication grooves (13) at equal intervals, the third annular communication grooves (13) are in one-to-, and each third annular communication groove (13) is communicated with the corresponding inner connecting through hole (15), and the width value of the notch of each third annular communication groove (13) is larger than the aperture value of the corresponding side communication hole (15).
2. The heat dissipation type 5G cable as claimed in claim 1, wherein the metal braid (5) and the metal reinforcing post (12) are made of high-strength aluminum alloy material, and the inner sheath (1) is made of rubber or other material with elasticity.
3. The heat dissipation type 5G cable according to claim 1, wherein the cross section of each strip-shaped notch (6) is of a triangular structure, and the vertex of an included angle between two isosceles side edges of each strip-shaped notch (6) is arranged back to the cable core (2).
4. The heat dissipation type 5G cable according to claim 1, wherein the widths of the notches of the first annular communication groove (8) and the second annular communication groove (11) are larger than the aperture value of the corresponding side outer communication hole (7).
5. The heat dissipation type 5G cable according to claim 1, wherein at least two communication holes (14) are formed in the inner sheath (1) along the circumference of the inner sheath, each communication hole (14) is communicated with the inner side and the outer side of the inner sheath (1), two ends of each communication hole (14) correspond to a third annular communication groove (13) and the first annular communication groove (8), and each third annular communication groove (13) is communicated with the corresponding first annular communication groove (8) through the communication hole (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010654775.6A CN111785434B (en) | 2020-07-09 | 2020-07-09 | Heat dissipation type 5G cable |
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| CN202010654775.6A CN111785434B (en) | 2020-07-09 | 2020-07-09 | Heat dissipation type 5G cable |
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| CN111785434B true CN111785434B (en) | 2022-02-11 |
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| CN113488265B (en) * | 2021-06-15 | 2023-05-30 | 安徽凌宇电缆科技有限公司 | Mining cable with compression resistance function |
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