Axially cooled radial coil type high speed electromagnet

Abstract

The purpose of the present invention is to provide an axially cooled radial coil type high-speed electromagnet, including an axially cooled type iron core and a radial type coil. The axial cooling iron core is cylindrical, with a cylindrical through hole in the center and a concentric annular groove on the end face, so that the main and auxiliary magnetic poles are formed inside and outside. The annular groove has at least two through holes in the axial direction, and the cross-section of the through holes is fan-shaped or waist-shaped, and is evenly distributed on the central circumference of the annular groove, or at least two fan-shaped grooves are opened on the surface of the iron core. Evenly distributed on the circumference of the iron core, the inner diameter of the fan-shaped groove is less than or equal to the inner diameter of the annular groove. The iron core part between two adjacent through holes or two fan-shaped grooves forms the inner core of the coil, and the radial coil is wound on the inner core of the coil. The invention disperses the traditional single multi-turn coil, reduces the inductance of the coil, improves the rising speed and decay speed of the current in the coil, accelerates the response speed of the electromagnet, further improves the control accuracy of fuel injection, and improves the economy of the diesel engine. nature and reduce emissions.

Description

technical field [0001] The invention relates to an electromagnet, in particular to an electromagnet for a fuel system of a diesel engine. Background technique [0002] Due to its high injection pressure, flexible and controllable fuel injection timing and injection rules, the electronically controlled fuel injection system for diesel engines is an effective means to improve fuel economy and reduce harmful emissions of diesel engines, and has been widely used. Whether it is electronically controlled pump nozzles, unit pumps, distribution pumps, or the fastest-growing high-pressure common rail electronically controlled fuel injection system, high-speed electromagnets are the most critical and core components to ensure their normal operation. . The electronically controlled fuel injection system of the diesel engine realizes the precise control of the cycle fuel injection quantity, fuel injection timing and fuel injection law through the precise control of the high-speed elect...

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Problems solved by technology

The electromagnet core adopts the combination form of silicon steel sheet and soft magnetic integral material, which weakens the eddy current to a certain extent and can reduce the temperature of the electromagnet core, but it is still a traditional E-shaped structure, only the upper end surface of the iron core It can be in contact with the cooling liquid for efficient convection heat exchange, while the middle part of the iron core and the coil mainly exchange heat through heat conduction, and the thermal resistance is large, and the heat transfer efficiency is low, so the coil and the middle part of the iron core cannot be well cooled, resulting in The temperature of the coil and core cannot be effectively reduced

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