CN216623874U - Double-shielding frequency conversion cable - Google Patents
Double-shielding frequency conversion cable Download PDFInfo
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- CN216623874U CN216623874U CN202122546047.6U CN202122546047U CN216623874U CN 216623874 U CN216623874 U CN 216623874U CN 202122546047 U CN202122546047 U CN 202122546047U CN 216623874 U CN216623874 U CN 216623874U
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Abstract
The embodiment of the utility model discloses a double-shielding variable frequency cable which comprises cable cores with symmetrical structures, wherein double shielding layers are arranged on the outer rings of the cable cores. The double shielding layer comprises a longitudinal covering layer positioned on the outer ring of the cable core and a braided layer of which the longitudinal covering layer is far away from the cable core. The cable core with the symmetrical structure can balance a magnetic field, eliminate hysteresis backflow and improve the anti-interference performance of the double-shielding variable frequency cable. Meanwhile, the double-shielding variable frequency cable comprises a double-shielding layer consisting of a longitudinal layer and a braided layer, the longitudinal layer can play a role in shielding and isolating, the braided layer can separate electromagnetic waves in the braided layer from electromagnetic waves outside the braided layer to generate a shielding effect, the cable core is further protected from external electromagnetic interference, negative effects caused by circuit frequency conversion are reduced to the maximum extent, and the double-shielding variable frequency cable is guaranteed to be capable of effectively guaranteeing accurate and quick transmission signals of the cable under external ultra-strong electromagnetic waves or other magnetic field interference.
Description
Technical Field
The embodiment of the utility model relates to the technical field of cable manufacturing, in particular to a double-shielding frequency conversion cable.
Background
In recent years, variable frequency speed regulating motors have been developed greatly at home and abroad. The variable frequency motor has the advantages of less equipment investment cost, simple structure, small volume, low cost, energy conservation, large speed regulation range, constant power and constant rotating speed, convenient use, large capacity and the like. Therefore, it is widely used in industries such as electric power, metallurgy, paper making, petroleum, chemical industry, etc., and recently, it is also widely used in household appliances. The variable frequency speed regulation technology relates to a variable frequency motor, a variable frequency power supply and a connecting cable, and the actual working frequency of the cable is 30-300 Hz, and the cable is often referred to as the variable frequency cable for short. The current variable frequency power supply is frequency-modulated by a silicon controlled element, and the waveform characteristic is changed to a great extent, so that a new problem is brought to a motor and a cable. The frequency adjusting range of the variable frequency power supply is wide, no matter the frequency is high or low, the variable frequency power supply has a waveform profile of a main frequency, the variable frequency power supply contains a plurality of higher harmonics, and the influence of the higher harmonics on signal transmission is large, so that the development of a variable frequency cable with anti-interference performance is urgent and imperative.
SUMMERY OF THE UTILITY MODEL
The utility model provides a double-shielding variable frequency cable, which aims to improve the anti-interference performance of the cable.
The embodiment of the utility model provides a double-shielding variable frequency cable which comprises a cable core with a symmetrical structure, wherein a double-shielding layer is arranged on the outer ring of the cable core; the double shielding layer comprises a longitudinal covering layer positioned on the outer ring of the cable core and a braided layer which is far away from the cable core.
Optionally, the longitudinal cladding layer and the woven layer are processed and finished on the same processing machine.
Optionally, the longitudinal cladding layer wraps the cable core in a longitudinal cladding mode.
Optionally, the longitudinal cladding layer comprises an aluminum-plastic composite tape.
Optionally, the woven layer comprises woven tin-plated copper wire tape.
Optionally, the cable core includes three power wire cores and three ground wire cores, the three power wire cores are arranged in a true-false-figure shape, the three ground wire cores are arranged in an inverted-false-figure shape, or the three power wire cores are arranged in an inverted-false-figure shape, and the three ground wire cores are arranged in a true-false-figure shape; the ground wire cores are located between the opposite outer sides of the two adjacent power wire cores.
Optionally, the cable core with include around the covering between the vertical covering, it includes the non-woven fabrics to wind the covering.
Optionally, fillers are arranged in gaps among the three power wire cores, the three ground wire cores and the wrapping layer.
Optionally, the double-shielded variable frequency cable further includes a sheath layer, and the sheath layer is located on one side of the braided layer far away from the cable core.
Optionally, the sheath layer includes a PVC material.
Optionally, the braid has a braid density greater than or equal to 85%.
The embodiment of the utility model provides a double-shielding variable frequency cable which comprises a cable core with a symmetrical structure, wherein a double-shielding layer is arranged on the outer ring of the cable core. The double shielding layer comprises a longitudinal covering layer positioned on the outer ring of the cable core and a braided layer, wherein the longitudinal covering layer is far away from the cable core. The cable core with the symmetrical structure can balance a magnetic field, eliminate hysteresis backflow and improve the anti-interference performance of the cable. Meanwhile, the double-shielding variable frequency cable comprises a double-shielding layer consisting of a longitudinal layer and a braided layer, the longitudinal layer can play a role in shielding and isolating, the braided layer can separate electromagnetic waves in the braided layer from electromagnetic waves outside the braided layer to generate a shielding effect, the cable core is further protected from external electromagnetic interference, negative effects caused by circuit frequency conversion are reduced to the maximum extent, and the double-shielding variable frequency cable is guaranteed to be capable of effectively guaranteeing accurate and quick transmission signals of the cable under external ultra-strong electromagnetic waves or other magnetic field interference.
Drawings
Fig. 1 is a schematic structural diagram of a double-shielded variable frequency cable according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another double-shielded variable frequency cable according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another double-shielded variable frequency cable according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another double-shielded variable frequency cable according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
Fig. 1 is a schematic structural diagram of a double-shielded variable frequency cable according to an embodiment of the present invention, and referring to fig. 1, the double-shielded variable frequency cable includes a cable core 10 having a symmetric structure, and a double shielding layer is disposed on an outer ring of the cable core 10; the double shielding layer includes a longitudinal cladding 21 positioned at an outer circumference of the cable core 10 and a braid 22 of the longitudinal cladding 21 away from the cable core 10.
For example, the cable core 10 may include three phase cores and 1 neutral core, and the three phase cores and 1 neutral core are arranged in a symmetrical structure, or the cable core includes three phase cores and three neutral cores, and the three phase cores and three neutral cores are arranged in a symmetrical structure. The three phase line cores are cable cores for transmitting phase line A signals, phase line B signals and phase line C signals in the three-phase alternating current circuit respectively.
The longitudinal cladding 21 and the braided layer 22 are positioned on the outer ring of the cable core 10, and the braided layer 22 has the function of preventing electric field concentration and partial discharge in the cable core 10. The longitudinal cladding layer 21 and the braided layer 22 play a role in shielding the cable core 10, that is, interference of signals outside the cable core 10 is prevented from influencing transmission signals in the cable core 10, and high-frequency interference of the cable core 10 to the outside is also prevented.
The double-shielding variable frequency cable comprises a cable core with a symmetrical structure, wherein a double shielding layer is arranged on the outer ring of the cable core. The double shielding layer comprises a longitudinal covering layer positioned on the outer ring of the cable core and a braided layer of which the longitudinal covering layer is far away from the cable core. The cable core with the symmetrical structure can balance a magnetic field, eliminate hysteresis backflow and improve the anti-interference performance of the double-shielding variable frequency cable. Meanwhile, the double-shielding frequency conversion cable comprises a double-shielding layer consisting of a longitudinal-covering layer and a weaving layer, the longitudinal-covering layer can play a role in shielding and isolating, the weaving layer can separate electromagnetic waves in the weaving layer from electromagnetic waves outside the weaving layer to generate a shielding effect, the cable core is further protected from external electromagnetic interference, negative effects caused by circuit frequency conversion are reduced, and the double-shielding frequency conversion cable is guaranteed to be under external ultra-strong electromagnetic waves or other magnetic field interference, so that accurate and quick transmission signals of the double-shielding frequency conversion cable can be effectively guaranteed.
With continued reference to fig. 1, optionally, longitudinal wrapping 21 and braiding 22 are completed on the same processing machine.
Optionally, the longitudinal cladding layer 21 wraps the cable core 10 in a longitudinal cladding manner.
The longitudinal cladding layer 21 wraps the cable core 10 in a longitudinal cladding mode, so that the surface of the longitudinal cladding layer 21 is smoother, wrinkles are avoided, and the shielding effect is better.
Optionally, the longitudinal cladding comprises an aluminium-plastic composite tape.
The polyethylene copolymer coated single-side aluminum-plastic composite belt is longitudinally wrapped, the coating type can enhance the flexibility of the aluminum-plastic composite belt, the aluminum-plastic composite belt is convenient to be molded through extrusion of a mold, and two edges of the aluminum-plastic composite belt are attached together in a dispensing mode to wrap a cable core. The aluminum-plastic composite belt can be a single-side film-coated aluminum-plastic belt, one side of the aluminum-plastic composite belt is metal, the other side of the aluminum-plastic composite belt is a plastic film, and the metal surface is positioned on one side of the longitudinal covering layer, which is far away from the cable core, and is in contact with the braided layer.
Optionally, the woven layer comprises woven tin-plated copper wire tape.
The weaving layer can be network structure, and the weaving layer adopts the tinned copper wire to weave, forms confined metallic structure, and network structure's weaving layer has the effect that increases dual shielding variable frequency cable flexibility. Meanwhile, the weaving layer with the net structure separates the electromagnetic wave in the weaving layer from the electromagnetic wave outside the weaving layer, so that a shielding effect is generated, and the electromagnetic interference between cable cores is avoided.
Optionally, the braid density of the braid is greater than or equal to 85%.
The general cable meets the IEC 60502-1 standard requirement, the weaving density of the weaving layer can reach more than 80%, the weaving layer of the embodiment is woven by using 0.3mm thick copper wires, the shielding transmission impedance of the cable is less than or equal to 1 omega/m within the range of 100MHz, the shielding effect is enhanced, and the cable is firm and firm.
Exemplarily, at 3 × 150+3 × 25mm2The composite shielding industrial frequency conversion cable is taken as an example, parameter setting during braiding of the braid is exemplarily shown, table one is parameter setting during braiding of the braid,
parameter setting during knitting of table-knit layer
The parameters in this embodiment are only shown by way of example, and in other embodiments, the user may set the parameters according to the requirement.
Fig. 2 is a schematic structural diagram of another double-shielded variable frequency cable according to an embodiment of the present invention, and referring to fig. 2, optionally, the cable core 10 includes three power cable cores 11 and three ground cable cores 12, where the three power cable cores 11 are arranged in a true-quality shape, the three ground cable cores 12 are arranged in an inverted-quality shape, or the three power cable cores 11 are arranged in an inverted-quality shape, and the three ground cable cores 12 are arranged in a true-quality shape; the ground wire core 12 is located between the opposite outer sides of two adjacent power wire cores 11.
Fig. 2 shows, by way of example, three power wire cores 11 arranged in an inverted delta configuration and three ground wire cores 12 arranged in a true delta configuration. The three power wire cores 11 are located in the middle of the cable core 10, and the ground wire cores 12 are located between the opposite outer sides of the two adjacent power wire cores 11. The power wire core 11 and the ground wire core 12 jointly form a loop of the double-shielding variable frequency cable for transmitting power. The power wire core 11 is formed by twisting a plurality of strands of copper wires on the surface layer of the carbon fiber rod, wherein the copper wires are preferably 5 th round twisted soft copper conductors specified in GB/T3956 standard, and the conductors have smooth surfaces and no damage and are insulated by burrs, sharp edges and raised or broken single wires. The soft copper conductor has excellent electrical conductivity, thermal conductivity, corrosion resistance and high temperature oxidation resistance. The carbon fiber rod has the characteristics of high temperature resistance and good heat dissipation performance, the heat of the conductive copper wire can be reduced, and the current-carrying capacity of the power wire core 11 is improved. In addition, the advantages of the carbon fiber rod such as high specific modulus, fatigue resistance and creep resistance greatly improve the bearing capacity and tensile strength of the power wire core 11, thereby improving the tensile strength of the cable core 10. The ground wire core 12 is made of stranded copper wires, preferably round stranded soft copper conductors of type 5 specified in the GB/T3956 standard.
The cable core is including setting up in the insulating layer 13 of each power sinle silk 11 and each ground sinle silk 12 outer lane, and insulating layer 13 has the effect that the power sinle silk 11 and ground sinle silk 12 of protection are not harmed. The material of the insulating layer 13 may be ethylene propylene rubber, and may also be cross-linked polyethylene. The ethylene-propylene rubber can be copolymerized by ethylene and propylene monomers, and a vulcanizing agent can be added in the process of mixing the ethylene-propylene rubber so as to improve the performance of the ethylene-propylene rubber. The ethylene propylene rubber has the stability of oxygen resistance, ozone resistance and partial discharge, and also has good water resistance and soft characteristic. When the insulating layer 13 is formed, the extrusion can be carried out on a rubber extruder, the extrusion is carried out according to a process card, the working temperature, the rotating speed and the traction speed of each part of the extruder meet the requirements, a proper mold is selected according to the size of the power wire core 11 when the insulating layer 13 on the outer ring of the power wire core 11 is prepared, and a proper mold is selected according to the size of the ground wire core 12 when the insulating layer 13 on the outer ring of the ground wire core 12 is prepared. Vulcanization is needed after extrusion, the molecular structure of the ethylene propylene rubber is changed from linear to net-shaped, the mechanical property and the electrical property of the insulation are improved, and the problems of bubbles, fish eyes, wrinkles and the like on the surface of the insulation layer 13 are solved.
The three power wire cores 11 are respectively wire cores for transmitting an A phase wire signal, a B phase wire signal and a C phase wire signal in a three-phase alternating current circuit, and the three ground wire cores 12 are three insulated wire cores with smaller sections and formed by decomposing a neutral wire core. The three power wire cores 11 and the three ground wire cores 12 are arranged in a delta shape, the structure is symmetrical, better electromagnetic compatibility is realized due to the interchangeability of the conducting wires, a certain effect is realized on inhibiting electromagnetic interference, odd-order frequency in higher harmonics can be counteracted, the anti-interference performance of the double-shielding variable frequency cable is improved, and the electromagnetic radiation is reduced.
Fig. 3 is a schematic structural diagram of another double-shielded frequency conversion cable according to an embodiment of the present invention, and referring to fig. 3, optionally, a wrapping layer 30 is included between the cable core 10 and the longitudinal covering layer 21, the wrapping layer 30 includes a non-woven fabric, and a non-woven fabric tape replaces an extruded plastic cushion layer, so that an outer diameter of the double-shielded frequency conversion cable is greatly reduced. Tighten three power sinle silks 11 and three earth core 12 around covering 30 and carry out ultimate design, guaranteed double shielding frequency conversion cable's roundness promptly and effectively keep apart double shielding layer again, and thickness ratio is thinner itself, has reduced double shielding frequency conversion cable's external diameter, has reduced the use of material simultaneously. The non-woven fabric around the covering 30 is reinforced non-woven fabric, and has high mechanical strength, good toughness, higher tensile strength and compressive strength and outstanding fatigue resistance.
With continued reference to FIG. 3, a filler 40 is disposed in the voids between the three power cores 11, the three ground cores 12 and the wrapping 30.
The filler 40 may be polypropylene and the filler 40 is a non-hygroscopic filler. The filler 40 prevents displacement among the wrapping layer 30, the three power wire cores 11 and the three ground wire cores 12 and is beneficial to heat dissipation.
Fig. 4 is a schematic structural diagram of another double-shielded frequency conversion cable according to an embodiment of the present invention, and referring to fig. 4, optionally, the double-shielded frequency conversion cable further includes a sheath layer 50, where the sheath layer 50 is located on a side of the braid 22 away from the cable core 10.
Optionally, jacket layer 50 comprises a PVC material.
The sheath layer 50 can be made of PVC material, and has the characteristics of flame retardance, oil resistance, light resistance, ultraviolet ray resistance, ozone resistance and the like. Illustratively, jacket layer 50 may be orange in color.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A double-shielding variable frequency cable is characterized by comprising a cable core with a symmetrical structure, wherein the outer ring of the cable core is provided with a double-shielding layer; the double shielding layer comprises a longitudinal cladding layer positioned on the outer ring of the cable core and a braided layer of which the longitudinal cladding layer is far away from the cable core;
the cable core comprises three power wire cores and three ground wire cores, wherein the three power wire cores are arranged in a true-to-standard shape, the three ground wire cores are arranged in an inverted-to-standard shape, or the three power wire cores are arranged in an inverted-to-standard shape, and the three ground wire cores are arranged in a true-to-standard shape; the ground wire cores are located between the opposite outer sides of the two adjacent power wire cores.
2. The double-shielded variable frequency cable of claim 1, wherein the longitudinal cladding layer wraps the cable core in a longitudinal wrap.
3. The double shielded variable frequency cable according to claim 1, wherein the longitudinal cladding comprises an aluminum-plastic composite tape.
4. The double shielded variable frequency cable of claim 1, wherein the braid comprises braided tin-plated copper ribbon.
5. The double-shielded variable frequency cable of claim 1, wherein a lapping layer is included between the cable core and the longitudinal covering layer, the lapping layer including non-woven fabric.
6. The double-shielded variable frequency cable of claim 5, wherein a filler is disposed in a gap between the three power wire cores, the three ground wire cores and the wrapping layer.
7. The double-shielded variable frequency cable of claim 1, further comprising a jacket layer on a side of the braid away from the cable core.
8. The double shielded variable frequency cable of claim 7, wherein the jacket layer comprises a PVC material.
9. The double shielded variable frequency cable of claim 1, wherein the braid has a braid density greater than or equal to 85%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122546047.6U CN216623874U (en) | 2021-10-21 | 2021-10-21 | Double-shielding frequency conversion cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122546047.6U CN216623874U (en) | 2021-10-21 | 2021-10-21 | Double-shielding frequency conversion cable |
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| Publication Number | Publication Date |
|---|---|
| CN216623874U true CN216623874U (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122546047.6U Active CN216623874U (en) | 2021-10-21 | 2021-10-21 | Double-shielding frequency conversion cable |
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| CN (1) | CN216623874U (en) |
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2021
- 2021-10-21 CN CN202122546047.6U patent/CN216623874U/en active Active
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