Proportional speed regulating valve

Abstract

The invention discloses a proportional speed regulating valve. The proportional speed regulating valve comprises a valve body, wherein a P port and A ports are formed in the valve body, a valve sleeve is arranged on the upper portion of the valve body, proportional electromagnets are arranged on the upper portion of the valve sleeve, and an armature is arranged in the proportional electromagnets;the lower surface of the armature abuts against an ejector rod, the ejector rod penetrates through the valve sleeve to abut against the throttle valve cores, the lower portion of the throttle valve cores extends into the valve body, throttling springs are arranged between the throttle valve cores and the valve body, and throttling control holes are formed in the side walls of the throttle valve cores; when the proportional electromagnets are electrified, the throttling control holes communicate with the A ports through flow passage cavities, flow through holes and pressure difference feedbackcavities which are sequentially connected on the valve body; and pressure difference compensation valve cores are arranged in the lower portion of the valve body, compensation springs are arranged between the pressure difference compensation valve cores and the valve body, the pressure difference compensation valve cores move upwards under the combined action of the P port and A ports, and so that the opening degrees of the A ports can be changed. According to the proportional speed regulating valve, the structure is reasonable and compact, the size is small, and the control is sensitive.

Description

technical field [0001] The invention relates to the technical field of flow valve manufacturing, in particular to a proportional speed regulating valve. Background technique [0002] In recent years, proportional flow valves have been used more and more in equipment such as truck-mounted cranes, aerial work vehicles, tractor rotary plows, and electric forklifts. The proportional flow valve can realize the constant pressure difference between the inlet and outlet of the flow valve, and will not be affected by load fluctuations, so that the flow rate flowing through the flow valve port is only related to the opening of the valve port, so that the flow rate can be adjusted accordingly Control, without being affected by load pressure fluctuations, and finally realize the reasonable distribution of pressure and flow of multiple oil circuits with different loads in the hydraulic system, and ensure the normal operation of various parts of the entire hydraulic system. [0003] For ...

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Problems solved by technology

[0004] 1. The flow control part includes valve sleeve, throttle valve core, valve seat, slide valve core, spring seat, etc., which contain many parts, and these parts are slid and socketed with each other, which requires high processing accuracy and assembly. Increased production costs, and prone to failure;

[0005] 2. In order to ensure that the pressure drop generated by the oil flowing from C port to A port does not affect the pressure difference adjusted by the spool valve core and differential pressure spring, and to ensure the adjustment accuracy of the proportional flow valve, the inner hole of the spring seat and the throttle valve core are required The inner hole should be large enough, but the spring seat and valve seat of this product are both sleeved in the inner hole of the spool valve core, the spool valve core is sleeved in the inner hole of the valve sleeve, and the throttle valve core is sleeved in the inner hole of the valve seat , such a structure increases the radial dimension and axial dimension, resulting in a larger volume, which limits the application

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