5results about How to "Reduce operating temperature rise" patented technology

The application provides a crosslinked polyethylene insulated cable and a preparation process thereof, and belongs to the technical field of cables, and comprises the following steps: step S1, preparing UiO-66-F4 masterbatch; step S2, preparing hexagonal boron nitride masterbatch and nano-alumina masterbatch; step S3, preparing insulation granules; step S4, performing three-layer co-extrusion on a copper core conductor to form a conductor shielding layer / insulation layer / insulation shielding layer, and then performing CV crosslinking, cooling, degassing, and then coating a metal braided shielding layer and an outer sheath to obtain the crosslinked polyethylene insulated cable. The application can improve the DC breakdown strength and long-term insulation stability of the crosslinked polyethylene insulated cable.

The invention relates to a capacitive high-voltage insulated bus and a manufacturing method thereof, and belongs to the technical field of high-voltage insulated buses, and the manufacturing method comprises the following steps: S1, conductor pretreatment: carrying out oil removal, oxide layer removal and sand blasting roughening treatment on the surface of a central conductor; s2, multi-layer material co-extrusion: pulling the preheated central conductor to pass through a multi-layer co-extrusion head at a constant speed; s3, synchronous cross-linking and forming: immediately guiding the multi-layer blank into a closed synchronous cross-linking and forming pipeline; and S4, post-processing and assembling: performing appearance detection, partial discharge test and withstand voltage test on the cross-linked bus. According to the capacitive high-voltage insulated bus and the manufacturing method thereof, an integrated composite capacitor structure composed of the inner semiconductor layer, the stepped capacitor layer and the outer semiconductor layer is designed, so that the potential between the high-voltage conductor and the grounding shell is linearly and uniformly distributed, and the phenomenon of electric field concentration is thoroughly eliminated; and the long-term insulation life and the operation voltage grade are obviously improved.

This utility model belongs to the field of fan blade technology and discloses a multi-blade noise-reducing blower fan blade, including: a fan blade assembly comprising 53 forward-curved fan blades evenly distributed along the circumference of a hub, with a motor mounting cavity at the center of the hub; the axial end face of the hub has several heat dissipation holes, arranged equidistantly along the circumference to form an annular heat dissipation channel; a motor assembly comprising a thickened silicon steel sheet frame, the silicon steel sheet thickness being 0.5-0.8mm; the ratio of the fan blade diameter D to the fan outer diameter D0 is 75%-78%; this utility model, by using 53 forward-curved fan blades with an optimized bending angle of 15°-25°, and a chord length ratio of the leading edge to the trailing edge of the blades of 1:0.8-1:0.9, effectively suppresses turbulence and eddy noise. An arc-shaped transition section with a transition radius R = 3-5mm is provided at the connection between the hub and the fan blades to reduce airflow separation noise.

The invention provides a crosslinked polyethylene insulated cable and a preparation process thereof, and belongs to the technical field of cables, and the preparation process comprises the following steps: step S1, preparing UiO-66-F4 master batch; s2, preparing a hexagonal boron nitride master batch and a nanometer aluminum oxide master batch; s3, preparing insulating granules; and S4, carrying out three-layer co-extrusion on the copper core conductor to form a conductor shielding layer / an insulating layer / an insulating shielding layer, then carrying out CV crosslinking, cooling and degassing, and then coating a metal braided shielding layer and an outer sheath to obtain the crosslinked polyethylene insulated cable. The direct-current breakdown strength and the long-term insulation stability of the crosslinked polyethylene insulated cable can be improved.

The invention discloses a mining flame-proof wiring terminal which comprises an insulating seat body, a conducting rod arranged in an axial through hole of the insulating seat body in a penetrating mode, and a pressing assembly. An independent explosion-proof joint surface is not formed between the conducting rod and the insulating seat body; the insulating seat body is directly fixed on the equipment separator through screws, so that only a joint surface between the outer cylindrical surface of the insulating seat body and the inner wall of the separator mounting hole is formed. The upper connecting part of the conducting rod can select a pre-embedded screw rod type or an insert nut type, and the lower connecting part can select a flat copper bar type or an internal thread cylinder type, so that various wiring schemes are combined. Through the integrated structure, the number of parts is greatly reduced, assembly procedures are greatly simplified, and the material cost and the manufacturing cost are greatly reduced; the intrinsic safety is improved from the source due to the design of a single explosion-proof joint surface; the overall structure is compact and the size is obviously reduced; the installation mode is simple and fast; the modular wiring form is high in adaptability, and a flexible, reliable and economical mining explosion-proof connection solution is provided for users.