Composite high-efficiency high-flow servo valve

Abstract

The invention relates to a composite high-efficiency high-flow servo valve. The technical scheme is as follows: the servo valve consists of a composite flow valve and a composite magnetic control motor, two ends of the composite flow valve are respectively connected with a left haft part and a right half part of the composite magnetic control motor. A first electromagnetic converter [2] and a displacement sensor [44] are concentrically arranged in a left shell [3] from left to right in sequence; a valve core [5] is movably arranged in a valve sleeve [11] that is fixed in a valve body [8]; an angle displacement sensor [37], a second electromagnetic converter [19], a left sliding bearing [35], a gear shaft [28] and a right sliding bearing [29] are concentrically arranged in a right shell [17] from left to right in sequence; one side of the gearing shaft [28] is provided with a rack [31] that is meshed with the gear shaft [28]; and one end of the valve core [5] of the composite flow valve is in contact with an end surface of a first electromagnetic memorial alloy [45], and the other end of the valve core [5] is fixedly connected with a second magnetic control memorial alloy [36]. The servo valve has the characteristics of high frequency response, high reliability, high flow, small volume, small leakage, compact structure and high precision.

Description

technical field [0001] The invention belongs to the technical field of servo valves, in particular to a composite high-frequency and large-flow servo valve. Background technique [0002] The development trend of the high-frequency electro-hydraulic servo system is to develop toward a response frequency above 1000 Hz to meet the needs of vibration environment tests and material fatigue tests in the process of new product development. The operating frequency of the electro-hydraulic servo system mainly depends on the response frequency of the servo valve. [0003] At present, advanced high-frequency servo valves mostly adopt two structures: nozzle-baffle type and jet tube type. The nozzle-baffle type is characterized by simple structure, small volume, small moment of inertia, small driving force required, no friction, and high sensitivity; but its median leakage is large and output flow is small; the aperture of the fixed orifice and the nozzle The gap between the baffles is...

AI Technical Summary

Problems solved by technology

[0006] Magnetic control memory alloy is a new type of material, which has the characteristics of fast response of giant magnetostrictive materials, large deformation of memory alloy and large output force. However, magnetic control memory alloy has the characteristics of difficulty in deformation recovery. Currently, there are two common solutions. One: First, it is realized by applying a magnetic field along the deformation and elongation direction of the component, but the excitation power of the required magnetic field is too large

The second is to place a return spring along the deformation direction. Although this method is easy to implement, it will reduce the output force of the magnetic control memory alloy element, cause a large positioning error, and slow down the dynamic response speed.

However, the throttling area of ​​the valve is composed of a groove and a window on the valve sleeve, and the direction of input and output is changed mainly through rotational movement. The output waveform is limited during the working process, and the flow in a single direction cannot be continuous, which limits the scope of application.

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