A valve switch mechanism for mechanical timing valve

Abstract

The invention belongs to the technical field of valves, and discloses a valve opening and closing mechanism for a mechanical timing valve. The mechanism is characterized by comprising a rotating shaft, a locking wheel in one-way linkage with the rotating shaft and a locking rod used for locking the locking wheel, wherein the rotating shaft is provided with a valve closing spring and is connected with the locking wheel through a ratchet mechanism, teeth are arranged on the circumference of the locking wheel, clamping teeth are arranged at the first end of the locking rod, the second end of the locking rod leans on the outer edge of a timer cam, the outer edge of the timer cam is composed of an arc contour with a rotation center as the center of a circle and a sudden change contour, when the arc contour of the timer cam corresponds to the second end of the locking rod, the clamping teeth at the first end of the locking rod are embedded in a clamping groove of the locking wheel, and when the sudden change contour of the timer cam corresponds to the second end of the locking rod, the second end of the locking rod moves along with the sudden change contour and the clamping teeth at the first end of the locking rod disengage from the clamping groove of the locking wheel. The valve opening and closing mechanism is compact and reasonable in structure and high in reliability and facilitates reducing of the product size and product cost.

Description

technical field [0001] The invention belongs to the technical field of valves, relates to the technology of how to realize timing closing of valves, and is mainly applied to valves of gas pipelines. Background technique [0002] The popularity of gaseous fuels in household applications has brought great convenience to people's lives, but some problems have gradually emerged. The most important issue that people pay attention to is the safety issue. For many years, people have focused on the prevention of fuel leakage. However, they have paid attention to the reflection of accidents that have occurred over the years, most of which are caused by valves being forgotten to close. In response to this problem, valves with timing functions have appeared in recent years, but electronic timers are mostly used, but due to the price and other reasons, they have not been popularized in households. And its biggest disadvantage is that when the battery fails, the timing function fails th...

AI Technical Summary

Problems solved by technology

More importantly, the high torque of the clockwork puts a greater burden on the gear set of the escapement speed regulating mechanism, which is easy to cause damage

In addition, in the process of closing the valve port, the gear transmission mechanism between the timer cam and the main shaft also needs to bear greater pressure, which not only requires increased strength, but is also easily damaged

On the other hand, the profile mutation distance of the timer cam is limited, and it is generally difficult to meet the action distance required to close the valve. It is also necessary to use a transmission mechanism such as a lever to transmit and amplify, but the use of a lever will greatly increase the size of the product.

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