Valve core assembly

A valve core assembly, comprising a transmission component and a valve core component, wherein

• the valve core component comprises a valve core body and a lower stop component, and the valve core body is substantially tubular;
• the lower stop component is provided in an inner chamber of the valve core body and is fixedly connected to the valve core body, the lower stop component comprises a lower stop portion, an upper chamber is located above the lower stop portion, and a lower chamber is located below the lower stop portion, and the lower stop component comprises a first axial through hole communicating with the upper chamber and the lower chamber;
• the valve core body further comprises a second axial through hole communicating with the upper chamber;
• the transmission component comprises a screw rod and a screw nut, and the screw rod is in threaded connection with the screw nut;
• the screw nut comprises a radial protrusion located in the upper chamber, the radial protrusion is configured to cooperate with an upper stop portion of the valve core component, and the screw nut is configured to drive the valve core component to move upward in an axial direction.