High voltage resistant moving magnet proportional electromagnet

Abstract

The invention discloses a high-pressure-resistant moving-magnet type proportional electromagnet which comprises a push rod, a front end cover, a shell, limiting plates, a spring, a control coil, a moving permanent magnet, a magnetic conduction sleeve, a static permanent magnet, a non-magnetic ring and a rear end cover. The shell is a hollow shell, two ends of the shell are respectively connected with the front end cover and the rear end cover, the magnetic conduction sleeve is connected with the inner side of the front end cover and the inner side of the shell, the control coil is arranged in a cavity formed by the magnetic conduction sleeve, the front end cover and the shell, and an outer ring surface of the static permanent magnet is in direct contact with an inner ring surface of the magnetic conduction sleeve. The high-pressure-resistant moving-magnet type proportional electromagnet has the advantages that the two permanent magnets are respectively used as a moving component and a static excitation source, so that a joint effect of attractive force and repulsive force can be realized, and force outputted by the proportional electromagnet can be greatly increased; the corresponding permanent magnet is used as the moving component, so that the shortcoming of non-characteristic constraints due to saturation and the like of magnetic conduction materials can be overcome, and a proportional control characteristic of the proportional electromagnet can be improved; the high-pressure-resistant moving-magnet type proportional electromagnet is high-oil-pressure-resistant and can be used as a wet electro-mechanical converter.

Description

technical field [0001] The invention relates to an electric-mechanical converter for an electro-hydraulic servo valve and a proportional valve in the field of fluid control, in particular to a high-voltage resistant moving magnet proportional electromagnet. Background technique [0002] Proportional electromagnets can convert input electrical signals into force or displacement output in proportion, and are widely used electro-mechanical conversion devices in electromechanical control systems. Invention patent CN188586B discloses a repulsive electromagnet actuator made of the same-sex repulsion principle of magnets, but it only has a repulsive effect, lacks oil pressure protection, and cannot work in a high oil pressure environment; invention patent CN102063998B discloses a The pressure-resistant proportional electromagnet based on the integrated magnetic sleeve improves the pressure resistance, but it uses the armature as the moving part, which only has suction effect, and t...

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Problems solved by technology

Invention patent CN188586B discloses a repulsive electromagnet actuator made of the same-sex repulsion principle of magnets, but it only has a repulsive effect, lacks oil pressure protection, and cannot work in a high oil pressure environment; invention patent CN102063998B discloses a The pressure-resistant proportional electromagnet based on the integrated magnetic sleeve improves the pressure resistance, but it uses the armature as the moving part, which only has the effect of suction, and the magnetic saturation problem of the armature limits its output force

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