CN210429399U - Special frequency converter power cable for coal mining machine - Google Patents

Abstract

The utility model discloses a special converter power cable of coal-winning machine, including fire-retardant sheath and cable core, fire-retardant sheath parcel is in the cable core outside, and the cable core includes function cable and main part wire, and function cable and main part wire interval arrangement are in the same place in the transposition. The utility model provides a special frequency converter power cable for coal mining machine, the roundness of the cable core is high, and the stability of the cable when bending can be ensured; the cable has excellent mechanical performance and good elasticity and flame retardant property.

Description

Special frequency converter power cable for coal mining machine

Technical Field

The utility model belongs to the technical field of the cable and specifically relates to a special converter power cable of coal-winning machine is related to.

Background

With the development of society and the progress of science and technology, frequency converters are developed rapidly in recent years due to energy conservation and are widely applied. However, harmonic signals generated by the frequency converter working inconsistent with the normal power supply frequency can be fed back to the power supply network to influence the power quality, and even damage can be caused to the electric appliance. To avoid such problems, it is generally required to use a shielded cable as a power cable of the frequency converter.

The existing cable structure special for the frequency converter is as follows: the conductor adopts a second type of compact conductor; the insulating material is polyvinyl chloride or polyethylene; the shielding layer is of a copper strip wrapping or copper wire weaving structure outside the cable core; the sheath is polyvinyl chloride. The existing variable frequency cable product cannot meet the requirements of occasions with soft installation requirements and high flame retardant performance requirements, such as mine underground mobile application occasions like mineral exploitation and the like.

Chinese patent application publication No. CN203746527U, the publication date is 2014 07 month 30 days, entitled "oil-proof, waterproof, and corrosion-resistant double-shielded control cable for coal mine", and discloses an oil-proof, waterproof, and corrosion-resistant double-shielded control cable for coal mine, which comprises a main cable core, a control cable core, a belting layer, an insulating layer, a shielding layer, a waterproof layer, and a protective sleeve, wherein the belting layer is provided with an inner shielding layer between the insulating layer, the inner shielding layer is formed by weaving nickel-plated copper-aluminum alloy wires and silicon rubber around, the shielding layer is wrapped with a heat insulating layer between the shielding layer and the waterproof layer, the ground wire core is wrapped with the heat insulating layer, and the control cable core is wrapped with a butyronitrile sheath outside the steel wire with an anticorrosive agent. However, in this patent, many main core parcels in same shielding layer, and the control line setting is outside the shielded wire, can't shield external interference, and because many main core settings are wrapped up by same shielding layer at the centremost, lead to its scope of buckling to be limited.

Disclosure of Invention

The utility model provides a special frequency converter power cable for coal mining machine, which aims to overcome the problems of insufficient flexibility, overlarge bending radius, and low flame retardant effect and strength of the outer sheath in the prior art, the roundness of the cable core is high, and the stability of the cable when bending can be ensured; the cable has excellent mechanical performance and good elasticity and flame retardant property.

The utility model provides a special converter power cable of coal-winning machine, includes fire-retardant sheath and cable core, and fire-retardant sheath parcel is in the cable core outside, and the cable core includes function cable and main part wire, and function cable and main part wire interval arrangement are stranded and are in the same place.

In the technical scheme, the flame-retardant sheath is made of chlorinated polyethylene rubber material with high flame retardance and high mechanical property, so that the cable is ensured to have excellent mechanical property, good elasticity and flame retardance. The functional cable and the main conductor are arranged at intervals and are twisted together, so that the roundness of the cable core can be ensured, and the stability of the cable during bending can be ensured.

Preferably, the functional cable comprises a control line conductor layer, a functional insulating layer, a ground wire conductor layer and a functional isolating layer, wherein the control line conductor layer, the functional insulating layer, the ground wire conductor layer and the functional isolating layer are sequentially arranged from inside to outside and are tightly attached to each other. In the structure, the grounding wire and the control wire are integrated into one cable, the grounding wire wraps the whole control wire, the grounding wire has a shielding effect after being grounded, the signal shielding can be performed on the control wire, the control wire signal is prevented from being interfered, the use of a shielding layer of the control wire is reduced, the cost is saved, and the occupied space is smaller and the reduction of the cable size is facilitated due to the integration of the grounding wire and the control wire.

Preferably, a fiber layer is arranged between the cable core and the flame-retardant sheath. The fiber layer is formed by weaving high-strength fibers, and the bending resistance of the cable can be improved.

Preferably, an insulating inner layer, an isolating middle layer and an outer shielding layer are arranged between the flame-retardant sheath and the fiber layer, and the insulating inner layer, the isolating middle layer and the outer shielding layer are sequentially arranged from inside to outside and are tightly attached to each other. The insulating inner layer is made of a high-strength insulating rubber sheath material, so that the cable core is subjected to overall insulation protection, and the cable is ensured to have excellent mechanical properties and certain insulating properties. The outer shielding layer is formed by weaving tinned copper wires, and the weaving density is not less than 80%. The insulating middle layer can isolate the insulating inner layer from the outer shielding layer.

Preferably, the main conductor is wrapped with a main conductor insulation layer, the main conductor insulation layer is wrapped with a main conductor shielding layer, and a main conductor isolation layer is arranged between the main conductor and the main conductor insulation layer. The main line insulating layer is made of ethylene propylene rubber materials with high electrical insulating property and high mechanical strength, and the cable core is subjected to overall insulation protection, so that the cable is guaranteed to have excellent electrical insulating property and good mechanical property. The main line shielding layer is woven by tinned copper wires and colored fibers, the tinned copper wires are used for shielding interference signals, and the colored fibers are used for phase separation identification of the main line core. The main line isolation layer is used for isolating the main body lead and the main line insulation layer.

Preferably, a main line semiconductor layer is provided between the main line insulating layer and the main line shielding layer. After the conductor is stranded, small protrusions are formed on the surface of the conductor, the electric field at the positions of the protrusions is far higher than that at other positions, and the main line semiconductor layer can play a role in balancing the electric field.

Preferably, the main conductor material is a tinned copper wire. The tinned copper wire is soft in material and good in conductivity, and compared with a bare copper wire, the tinned copper wire is higher in corrosion resistance and oxidation resistance, and the service life of a weak current cable can be greatly prolonged.

Preferably, the monofilament diameter of the main conductor is less than 0.41 mm. The diameter of the monofilament is not more than 0.41mm, so that the minimum bending radius of the finished cable can be ensured to be 6 times of the outer diameter of the cable;

the utility model has the advantages that: (1) the cable core has high roundness, so that the stability of the cable during bending is ensured; (2) the cable has excellent mechanical property and good elasticity and flame retardant property; (3) the cable interference signal shielding effect is good; (4) the electric field of the cable can be equalized; (5) the grounding wire and the control wire are integrated, so that the occupied space is smaller, the use of a shielding layer of the control wire is reduced, and the cost is saved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: the cable comprises a cable core 1, a functional cable 1.1, a control wire conductor layer 1.1.1, a functional insulating layer 1.1.2, a ground wire conductor layer 1.1.3, a functional isolation layer 1.1.4, a main body wire 1.2, a fiber layer 2, an insulating inner layer 3, an isolation middle layer 4, an outer shielding layer 5, a flame-retardant sheath 6, a main wire isolation layer 7, a main wire insulating layer 8, a main wire semiconductor layer 9 and a main wire shielding layer 10.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

Example 1:

as shown in fig. 1, the special frequency converter power cable for the coal mining machine comprises a flame-retardant sheath 6 and a cable core 1, wherein the flame-retardant sheath 6 is wrapped outside the cable core 1, the cable core 1 comprises a functional cable 1.1 and a main conductor 1.2, and the functional cable 1.1 and the main conductor 1.2 are arranged at intervals and twisted together; the functional cable 1.1 comprises a control line conductor layer 1.1.1, a functional insulating layer 1.1.2, a ground wire conductor layer 1.1.3 and a functional isolating layer 1.1.4, wherein the control line conductor layer 1.1.1, the functional insulating layer 1.1.2, the ground wire conductor layer 1.1.3 and the functional isolating layer 1.1.4 are sequentially arranged and tightly attached from inside to outside; the main body lead 1.2 is made of a tinned copper wire, and the diameter of a single wire of the main body lead 1.2 is less than 0.41 mm; the main line isolation layer 7, the main line insulation layer 8, the main line semiconductor layer 9 and the main line shielding layer 10 are wrapped outside the main body lead 1.2, and the main line isolation layer 7, the main line insulation layer 8, the main line semiconductor layer 9 and the main line shielding layer 10 are arranged in place and attached in sequence; an insulating inner layer 3, an isolating middle layer 4, an outer side shielding layer 5 and a fiber layer 2 are arranged between the cable core 1 and the flame-retardant sheath 6, and the insulating inner layer 3, the isolating middle layer 4, the outer side shielding layer 5 and the fiber layer 2 are sequentially arranged from inside to outside and are tightly attached.

In the technical scheme, the flame-retardant sheath 6 is made of chlorinated polyethylene rubber material with high flame retardance and high mechanical property, so that the cable is ensured to have excellent mechanical property and good elasticity and flame retardance. The functional cable 1.1 and the main conductor 1.2 are arranged at intervals and twisted together, so that the roundness of the cable core 1 can be ensured, and meanwhile, the stability of the cable during bending is ensured. The grounding wire and the control wire are integrated into one cable, the grounding wire wraps the whole control wire, the shielding effect is achieved after the grounding wire is grounded, the signal shielding can be performed on the control wire, the control wire signal is prevented from being interfered, the use of a shielding layer of the control wire is reduced, the cost is saved, and the occupied space is smaller and the reduction of the cable size is facilitated due to the integration of the grounding wire and the control wire. The fiber layer 2 is formed by weaving high-strength fibers, and can improve the bending resistance of the cable. The insulating inner layer 3 is made of a high-strength insulating rubber sheath material, so that the cable core 1 is subjected to overall insulation protection, and the cable is guaranteed to have excellent mechanical performance and certain insulating performance. The main line semiconductor layer 9 may function to equalize the electric field.

The utility model has the advantages that: the cable core has high roundness, so that the stability of the cable during bending is ensured; the cable has excellent mechanical property and good elasticity and flame retardant property; the cable interference signal shielding effect is good; the electric field of the cable can be equalized; the grounding wire and the control wire are integrated, so that the occupied space is smaller, the use of a shielding layer of the control wire is reduced, and the cost is saved.

Claims (7)

1. The utility model provides a special converter power cable of coal-winning machine, includes fire-retardant sheath and cable core, and fire-retardant sheath parcel is in the cable core outside, and characterized by, the cable core includes function cable and main part wire, and function cable and main part wire interval arrangement are stranded and are in the same place.

2. The special frequency converter power cable for the coal mining machine as claimed in claim 1, wherein the functional cable comprises a control wire conductor layer, a functional insulating layer, a ground wire conductor layer and a functional isolating layer, and the control wire conductor layer, the functional insulating layer, the ground wire conductor layer and the functional isolating layer are sequentially arranged from inside to outside and are closely attached to each other.

3. The frequency converter power cable special for the coal mining machine as claimed in claim 1 or is characterized in that a fiber layer is arranged between the cable core and the flame-retardant sheath.

4. The frequency converter power cable special for the coal mining machine as claimed in claim 3, wherein an insulating inner layer, an isolating middle layer and an outer shielding layer are arranged between the flame-retardant sheath and the fiber layer, and the insulating inner layer, the isolating middle layer and the outer shielding layer are sequentially arranged from inside to outside and are closely attached.

5. The frequency converter power cable special for the coal mining machine according to the claim 1, the claim 2, the claim 3 or the claim 4, wherein the main conductor is wrapped with a main line insulation layer, the main line insulation layer is wrapped with a main line shielding layer, and a main line isolation layer is arranged between the main conductor and the main line insulation layer.

6. The frequency converter power cable special for the coal mining machine as claimed in claim 5, wherein a main line semiconductor layer is arranged between the main line insulating layer and the main line shielding layer.

7. The frequency converter power cable special for the coal mining machine according to claim 1, 2, 3 or 4, wherein the main conductor material is tinned copper wire.

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