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CN-122025252-A - Cold-resistant crosslinked polyethylene insulated variable frequency cable

CN122025252ACN 122025252 ACN122025252 ACN 122025252ACN-122025252-A

Abstract

The invention relates to the technical field of crosslinked polyethylene cables, and provides a cold-resistant crosslinked polyethylene insulated variable-frequency cable which comprises a conductor, a crosslinked polyethylene insulating layer, a shielding layer and an outer sheath, wherein the crosslinked polyethylene insulating layer is wrapped outside the conductor, filling is arranged between the shielding layer and the crosslinked polyethylene insulating layer, the outer sheath is wrapped outside the shielding layer, the cold-resistant crosslinked polyethylene insulated variable-frequency cable further comprises a heat preservation layer and a heating component, the heat preservation layer is provided with a plurality of heat preservation layers, the heat preservation layers are detachably arranged outside the outer sheath, the heat preservation layers are of openable and closable structures, the outer sheath is insulated when the heat preservation layers are closed, the outer sheath can ventilate and dissipate heat when the heat preservation layers are opened, and the heating component is arranged on the heat preservation layers and is used for heating the inner part of the heat preservation layers when the heat preservation layers are in a closed state, so that cold-resistant protection of the cable in a low-temperature environment is realized. Through above-mentioned technical scheme for solve the variable frequency cable among the prior art and become brittle in cold environment, easily produce the damage problem.

Inventors

  • ZHAI LIYUAN

Assignees

  • 河北明一线缆有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (8)

  1. 1. The utility model provides a cold-resistant crosslinked polyethylene insulation variable frequency cable, includes conductor (1), crosslinked polyethylene insulating layer (2), shielding layer (3) and oversheath (4), crosslinked polyethylene insulating layer (2) parcel is in the outside of conductor (1), shielding layer (3) with be provided with the packing between crosslinked polyethylene insulating layer (2), oversheath (4) parcel is in the outside of shielding layer (3), its characterized in that still includes: The heat preservation layers are arranged in a plurality, are detachably arranged outside the outer jackets (4), are of an openable structure, and are used for preserving heat of the outer jackets (4) when being closed, and enable the outer jackets (4) to be ventilated and radiating when being opened; The heating assembly is arranged on the heat preservation layer and is used for heating the inside of the heat preservation layer when the heat preservation layer is in a closed state, so that cold-resistant protection of the cable in a low-temperature environment is realized.
  2. 2. The cold-resistant crosslinked polyethylene insulated variable frequency cable according to claim 1, wherein the heat-insulating layer comprises: The mounting rings (101), the number of the mounting rings (101) is two, and the mounting rings (101) are detachably arranged outside the outer sheath (4); The mounting ring comprises an outer semi-ring (102) and an inner semi-ring (103), wherein an annular chute used for the outer semi-ring (102) and the inner semi-ring (103) to slide is formed in the mounting ring (101), the inner wall of the outer semi-ring (102) is contacted with the outer wall of the inner semi-ring (103), and the outer semi-ring (102) and the inner semi-ring (103) can be enclosed to form a closed heat preservation cavity.
  3. 3. The cold-resistant crosslinked polyethylene insulated variable frequency cable according to claim 2, wherein the heat-insulating layer further comprises: The stop block (104) is fixedly arranged on the outer side of the inner semi-ring (103), a stop groove matched with the stop block (104) is formed in the outer semi-ring (102), and when the stop block (104) is positioned in the stop groove, the inner semi-ring (103) and the outer semi-ring (102) are in a completely closed state or a maximum open state; and the limiting assembly is arranged on the outer semi-ring (102) and is used for locking the stop block (104) in the blocking groove.
  4. 4. A cold-resistant crosslinked polyethylene insulated variable frequency cable according to claim 3, wherein the spacing assembly comprises: The clamping block (201) is arranged on the outer semi-ring (102), a limiting groove is formed in the outer semi-ring (102), the clamping block (201) is arranged in the limiting groove through a telescopic rod (202) and a compression spring (203), and a clamping groove matched with the clamping block (201) is formed in the stop block (104).
  5. 5. The cold-resistant crosslinked polyethylene insulated variable frequency cable of claim 4, wherein the heating assembly comprises: a heater (301), the heater (301) being mounted inside the inner half ring (103); And the temperature sensor (302) is electrically connected with the heater (301) and is used for monitoring the temperature inside the heat preservation layer and regulating and controlling the temperature of the heater (301).
  6. 6. Cold-resistant crosslinked polyethylene insulated variable frequency cable according to claim 5, characterized in that a telescopic protective cover (5) is arranged between two adjacent heat insulation layers.
  7. 7. The cold-resistant crosslinked polyethylene insulated variable frequency cable according to claim 6, wherein the mounting ring (101) is provided with a communication hole (6) for communicating with the telescopic protective cover (5), one communication hole (6) of the plurality of communication holes (6) positioned at the edge is communicated with a circulation bin (7), and a fan (8) is arranged in the circulation bin (7).
  8. 8. Cold-resistant crosslinked polyethylene insulated variable frequency cable according to claim 7, characterized in that the inside of the communication hole (6) is detachably provided with a sealing cover (9).

Description

Cold-resistant crosslinked polyethylene insulated variable frequency cable Technical Field The invention relates to the technical field of crosslinked polyethylene cables, in particular to a cold-resistant crosslinked polyethylene insulated variable frequency cable. Background The variable frequency cable is mainly used for connecting a variable frequency power supply and a variable frequency motor, is widely applied to the industrial fields of metallurgy, papermaking, mines, railways and the like, and when a traditional power cable works under variable frequency conditions, the cable body is easy to emit electromagnetic waves outwards due to the influence of higher harmonics to interfere adjacent electrical equipment, and meanwhile, the cable insulation layer is easy to break down due to overvoltage caused by travelling wave reflection. At present, cross-linked polyethylene (XLPE) is mainly used as an insulating material in the industry, and because of small dielectric loss, high temperature resistance level and good mechanical property, a copper wire braided shield or a common copper strip wrapped shield is generally adopted in the conventional design on a shielding structure, however, in a cold environment, a common PVC sheath can be hardened and embrittled, and the tensile and impact resistance properties are rapidly reduced, so that the PVC sheath is easy to damage, even crack or break. Disclosure of Invention The invention provides a cold-resistant crosslinked polyethylene insulated variable frequency cable, which is used for solving the problem that the variable frequency cable in the prior art is fragile in a cold environment and is easy to damage. The technical scheme of the invention is as follows: the utility model provides a cold-resistant crosslinked polyethylene insulation variable frequency cable, includes conductor, crosslinked polyethylene insulating layer, shielding layer and oversheath, crosslinked polyethylene insulating layer parcel is in the outside of conductor, the shielding layer with be provided with between the crosslinked polyethylene insulating layer and fill, the oversheath parcel is in the outside of shielding layer still includes: the heat preservation, the heat preservation is provided with a plurality of, the heat preservation can be dismantled and set up the outside of oversheath, the heat preservation is but the switching structure, the heat preservation is right when closing the oversheath keeps warm, make when the heat preservation is opened the oversheath can ventilate heat dissipation, the heat preservation includes: the mounting rings are arranged in two and are detachably arranged outside the outer sheath; the mounting ring is provided with an annular chute for the outer semi-ring and the inner semi-ring to slide, the inner wall of the outer semi-ring is contacted with the outer wall of the inner semi-ring, and the outer semi-ring and the inner semi-ring can be enclosed to form a closed heat preservation cavity; The stop block is fixedly arranged on the outer side of the inner semi-ring, a stop groove matched with the stop block is formed in the outer semi-ring, and when the stop block is positioned in the stop groove, the inner semi-ring and the outer semi-ring are in a completely closed state or a maximum open state; The limiting component is arranged on the outer semi-ring and is used for locking the stop block in the blocking groove, and the limiting component comprises: the clamping block is provided with a limiting groove, the clamping block is arranged in the limiting groove through a telescopic rod and a compression spring, and the stop block is provided with a clamping groove matched with the clamping block; The heating element, heating element sets up on the heat preservation for to its inside heating when the heat preservation is in the closed state, realize cold-resistant protection under the cable low temperature environment, heating element includes: A heater installed inside the inner half ring; and the temperature sensor is electrically connected with the heater and is used for monitoring the temperature inside the heat preservation layer and regulating and controlling the temperature of the heater. For carrying out comprehensive protection to the cable, two adjacent heat preservation between be provided with flexible protection casing. For improving cold-resistant protection effect to the cable, set up on the collar be used for with the intercommunicating pore of flexible protection casing intercommunication, be located a plurality of at the edge in the intercommunicating pore intercommunication has circulation storehouse, circulation storehouse's internally mounted has the fan. In order to ensure the sealing effect of the heat preservation and the telescopic protective cover, a sealing cover is detachably arranged in the communication hole on the mounting ring at the edge. The working principle and the beneficial effects of the invention are as fol