An anti-pollution and impact-resistant hydraulic cone valve with a throttle groove on the spool

Abstract

The invention provides an anti-pollution collision-resistant hydraulic cone valve with a valve core provided with throttling grooves. The cone valve comprises a valve core, a valve body, an elastic valve seat, a dirt accepting small hole, a bypass runner, four throttling grooves and a built-in flow sensor. The valve core is arranged in an inner hole of the valve body, the four throttling grooves are radially formed in the cone of the head of the valve core, the throttling groove and a bump of the valve body form a back valve port, and the cone of the head of the valve core and the elastic valve seat form a front valve port. The dirt accepting small hole is located in the side wall of an upstream duct of the front valve port, and the inlet of the dirt accepting small hole communicates with the outlet of the dirt accepting small hole through the bypass runner. The built-in flow sensor is located on the downstream side of the back valve port. According to the cone valve provided by the invention, the separated replaceable elastic valve seat is arranged to absorb impact energy of the valve core to slowdown the impact wear of the valve seat of the valve core, gaps induced by particles are compensated by elastic deformation of the valve seat, particle pollution is accommodated and blocked by means of a joint action of the dirt accepting small hole and the bypass runner, the valve core is provided with the throttling grooves, and the front and back valve ports are closed asynchronously to start the opening and closing characteristic of the cone valve, so that the cone valve has an ability of preventing pollution and resisting impact and an excellent opening and closing control characteristic.

Description

technical field [0001] The invention relates to the technical field of hydraulic valves, in particular to a hydraulic cone valve. Background technique [0002] Hydraulic cone valve is one of the most commonly used basic components in fluid transmission and control technology. It has a simple structure and strong flow capacity, and is often used as the main valve or pilot valve of pressure and flow control valves. The valve port is the key part of the poppet valve, and its performance determines the working characteristics of the poppet valve and the hydraulic system. [0003] During the normal operation of the hydraulic poppet valve, due to frequent opening and closing, the impact between the valve core and the valve seat is often caused, which makes the valve core and valve seat wear, and then induces the sealing failure of the poppet valve. In addition, the oil often contains a certain amount of solid particles. In engineering practice, it is found that when the valve por...

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Problems solved by technology

The function of the relief valve can be restored by grinding the scars on the cone valve with abrasive cloth and sandpaper on a drill press. The technology is insufficient: the sealing ability of the cone valve may decrease after multiple grinding repairs

(2) Leakage of the cone valve caused by sticking particulate matter, there is a utility model patent "a hydraulic cone valve" (Huang Shufang, CN201520052390.7), which adopts grooves in the conical section of the valve core to store impurities in the liquid flow and prevent them The scratch on the surface of the valve core is insufficient in technology: the groove opened is a blind groove. In actual work, the groove is filled with liquid, and it is difficult for impurities in the liquid flow to enter the groove, and it is difficult to achieve the desired effect.

(3) Flow control characteristics of poppet valve opening and closing process: Literature "CFD-Based Fluid-Structure Interaction Analysis of Hydraulic Poppet Valve Opening Process" (He Xiaohui, Luan Jian, Wang Qiang. Fluid-solid coupling analysis of hydraulic poppet valve opening process based on CFD[J ]. Hydraulics and Pneumatics, 2015, (09): 122-125. [2017-10-12].) pointed out that the flow field of the hydraulic poppet valve is unstable during the opening process, and its performance has a great impact on the hydraulic system, but no effective solution

The patent "a hydraulic cone valve with damping and pressure regulation at the rear end of the spool (CN201620200966.4)" aims at the problem that the low damping of ordinary hydraulic cone valves makes it easy to vibrate, resulting in poor system stability. The end damping pressure regulating unit increases the system damping and effectively improves the stability of the poppet valve, but it does not solve the problem of flow control during the opening and closing of the poppet valve

In addition, for the impact wear of hydraulic poppet valve, poppet valve leakage caused by particle sticking, and flow control characteristics of the opening and closing process, the literature that proposes an effective comprehensive solution has not yet been reported.

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