Vacuum die casting stop valve

Abstract

The invention relates to a stop valve, in particular to a vacuum die casting stop valve. As flashing is continuously accumulated and clamped in a clearance between a valve core and a valve body, the valve core and the valve body are easy to damage, the action of the valve core is insensitive, once an air exhaust channel is closed out of time, liquid metal overflows to a vacuum air exhaust device and the vacuum air exhaust device is scrapped. The vacuum die casting stop valve comprises a valve seat, an upper valve body, a lower valve body and the valve core, wherein the lower valve body and the upper valve body are positioned above the valve seat; and the upper end of the valve core penetrates the lower valve body and can move therein, and the lower end thereof is positioned in a cavity ofthe valve seat. The vacuum die casting stop valve is characterized in that: the valve core is provided with a circular groove; and the lower valve body is internally provided with a liquid runner which passes through the valve core. The valve core is provided with the circular groove, and the liquid runner is connected with the valve core, thus avoiding that flashing is continuously accumulated and clamped in the clearance, protecting the valve core and the valve body, and preventing the two from drags due to flashing; furthermore, oil flowing through the liquid runner has the functions of cooling and lubricating, thus being conducive to improving the sensitivity of the action of the valve core, and effectively prolonging the service life of the vacuum die casting stop valve.

Description

【Technical field】 [0001] The invention relates to a shut-off valve, especially a vacuum die-casting shut-off valve. 【Background technique】 [0002] Since die castings are produced under high temperature, high pressure, and high speed conditions, if the gas in the cavity is not removed quickly, the product quality will be unstable. Vacuum exhaust is an effective means to solve this problem. The vacuum stop valve is the main component of the vacuum exhaust system. The vacuum stop valve usually includes a valve body, an exhaust channel set in the valve body and a movable valve core. At the beginning of die casting, the vacuum stop valve exhausts, and the gas is exhausted Once the exhaust is completed, the valve core moves to close the exhaust channel in time. At this time, the liquid metal cannot overflow from the exhaust channel to the outside of the valve. During the die-casting process, the pressure is high. Since the valve core and the valve body are in a gap fit, the liq...

AI Technical Summary

Problems solved by technology

During the die-casting process, the pressure is high. Since the valve core and the valve body are in a gap fit, the liquid metal easily enters the gap between the two. After cooling, the liquid metal forms a hard metal flash, and the flash accumulates and gets stuck on the valve core. In the gap between the valve core and the valve body, abrasive wear occurs during the movement of the valve core, resulting in damage to the valve body or valve core

On the other hand, if the flash is stuck in the gap between the valve core and the valve body, the valve core will not move sensitively. Once the exhaust passage is not closed in time, the liquid metal will overflow into the vacuum pumping device and it will be scrapped.

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