Large-flow intelligent control solenoid valve of engine piston cooling system

Abstract

The invention discloses a large-flow intelligent control solenoid valve of an engine piston cooling system. The large-flow intelligent control solenoid valve comprises an electromagnet device, a valvedevice and a push rod for transmitting electromagnetic force of the electromagnet device to the valve device; the electromagnet device comprises an electromagnetic coil, a housing, a magnetic spacer,a movable armature, an upper yoke, and a lower yoke; the valve device comprises a valve body, a valve core and a reset spring, the valve body and the lower yoke are integrally arranged, and an ejector rod abuts against the movable armature and the valve core; and the valve core is provided with a pressure balance hole, the pressure balance hole communicates with an inner cavity of the valve bodyat the two ends of the valve core, and a surrounding pressure relief oil channel which communicates the inner cavity of the valve body above the valve core and a low-pressure area at an oil outlet isarranged between the valve body and the valve core. Under large flow conditions, the oil pressure of a lower cavity or an upper cavity of the valve core forms an intermediate high and low pressure gradient, the influence of the oil pressure gradient on the pressure imbalance caused by the valve core is eliminated, and the regulation and control precision of the piston cooling oil quantity is improved.

Description

technical field [0001] The invention relates to the technical field of solenoid valves, in particular to an intelligent control solenoid valve with a large flow rate for an engine piston cooling system. Background technique [0002] With the application of technologies such as turbocharging and high compression ratio, the combustion temperature of the engine is getting higher and higher, and the temperature of the environment where the piston is located is also getting higher and higher, which is prone to deflagration, which will cause serious damage to the lubrication, life of the piston and smoothness of the engine. Negative Effects. The engine piston cooling system can cool the engine piston, which can effectively reduce piston wear, prolong piston life and ensure smooth operation of the engine. Most of the control components of the known piston cooling system are mechanical on-off valves or electromagnetic on-off valves. This type of on-off valve can only control the op...

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Problems solved by technology

[0008] However, when the flow rate is large (generally exceeding 30L / min), such as the Weichai P6 engine (this is a mid-range power engine), the flow rate of the piston cooling oil can generally reach 70L / min, and the pressure can reach 0.6Mpa. In this case, as Figure 8 As shown, when the engine oil flows in from the oil inlet 301 below and flows out from the oil outlet 302 provided on the side peripheral part, it has a certain impact force, and the impact force is unevenly distributed in the valve core oil chamber, causing the valve core The oil pressure P2 in the lower chamber changes in a gradient (the middle pressure is high and the surrounding pressure is low). Affected by this pressure gradient, only setting the oil pressure balance hole 311 at the top of the valve core 31 cannot make the oil pressure acting on the upper and lower ends of the valve core 31 When the balance is reached, especially when the valve is about to close, the flow area at the oil outlet 302 of the valve decreases and the flow rate increases. According to the principle of the liquid Bernoulli equation, the pressure at the oil outlet 302 decreases, and the force under the valve core 31 is will decrease sharply, and the oil in the valve body cavity above the valve core 31 is relatively static, and the oil pressure P1 in the cavity above the valve core does not form a pressure gradient, which further aggravates the pressure imbalance of "high intermediate pressure and low surrounding pressure" The problem is that the spool is subjected to an unbalanced hydraulic pressure that is conducive to the closing of the spool during the closing process, and it is prone to the phenomenon that the spool is not automatically closed by human control. Phenomenon, ultimately unable to accurately control the amount of cooling oil for the piston

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