Proportional flow unit under compound control of electromagnetic switch valves and proportional throttle valve in parallel

Abstract

The invention discloses a proportional flow unit under compound control of electromagnetic switch valves and a proportional throttle valve in parallel. The proportional flow unit comprises a Valvistor main valve and a digital continuous compound flow control unit, the digital continuous compound flow control unit is formed by connecting one two-position two-way electromagnetic proportional valve and multiple two-position two-way electromagnetic valves in parallel to be used as a pilot valve, and the flow of the two-position two-way electromagnetic proportional valve is smaller than or equal to that of the two-position two-way electromagnetic valve of the smallest specification among all the two-position two-way electromagnetic valves. The proportional flow unit under compound control of the electromagnetic switch valves and the proportional throttle valve in parallel has the advantages of an existing digital flow control unit technology, and can achieve continuous flow control and meet the requirement for very large flow and anti-explosion application.

Description

technical field [0001] The invention relates to a proportional flow valve which adopts a combination of a plurality of parallel electromagnetic switch valves and electromagnetic proportional valves to realize continuous flow control, in particular to a proportional flow unit for parallel compound control of electromagnetic switch valves and proportional throttle valves. Background technique [0002] In the electro-hydraulic control system, the traditional control method to realize the hydraulic execution speed is to use the proportional flow valve with continuously adjustable valve port area. This method needs to select the corresponding specification control valve according to the maximum speed of the hydraulic actuator. To this end, manufacturing companies need to have serialized products for users to choose from. For large-flow applications, the technology is complex and the product cost is high. It is difficult for large-scale valves to take into account the characterist...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of the above-mentioned digital flow control unit that the output flow cannot be continuously controlled, it is limited by the power of the electromagnet, it is not suitable for large flow occasions, there is shock vibration in the speed regulation process, the control power is large, and it cannot meet the requirements of explosion-proof applications. The problem is to provide a proportional flow unit that not only has the technical advantages of the existing digital flow control unit, but also realizes continuous flow control, and can meet the requirements of particularly large flow and explosion-proof applications.

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