Fluororesin diaphragm valve

A sealing mechanism of a fluororesin diaphragm valve, used for liquid transportation at 200° C. without forced cooling of an external gas and for liquid transportation at 230° C. with forced cooling of the external gas, the sealing mechanism of the fluororesin diaphragm valve comprising related parts and mechanisms of a valve portion;

• the valve portion including a valve body, a force-applying member, a valve upper cover, a diaphragm, and a valve shaft;
• the valve body including an inlet, an outlet, a valve chamber, an annular portion, and a square portion;
• the valve shaft being a hollow shaft, including a fixing end, a shaft rod, and a plurality of gas guide holes;
• the annular portion being a cup-shaped structure having an opening, a bottom of the annular portion being defined as the valve chamber, the annular portion including a sealing surface, an external ring surface, a minimum diameter area, one or more cooling gas holes, a cooling gas annular groove and an internal ring surface, the opening being closed by the valve upper cover;
• the valve upper cover including an inner accommodating chamber, an external ring surface, a top, and a central hole;
• the diaphragm including a peripheral portion, an elastic portion, and a central portion:
• one end of the valve shaft having a fixing end capable of locking the central portion of the diaphragm;
• characterized in that:
• the valve portion further includes a tightening ring;
• the annular portion further includes a ribbed plate structure;
• the sealing mechanism includes the annular portion, the ribbed plate structure, the diaphragm, the tightening ring, and the force-applying member;
• the force-applying member has a tightening surface, and the tightening surface is a structural surface;
• the annular portion has the sealing surface, the sealing surface is a structural surface;
• the tightening surface connects the annular portion to the sealing surface to form a C-shaped structure;
• a tightening portion of the C-shaped structure includes the force-applying member, and the force-applying member is tightly locked to the annular portion;
• a support arm of the C-shaped structure provides overall structural strength for the annular portion and the ribbed plate structure;
• a base of the C-shaped structure is the sealing surface, which is supported by the minimum diameter area, a flow channel side wall of the valve chamber and the ribbed plate structure;
• the tightening surface is moved downward by locking tightly, so that the tightening ring and the diaphragm are clamped by the tightening surface and the sealing surface to prevent leakage;
• the tightening ring is an annular structure with an approximately rectangular cross-section, and has two ends defined as a force-receiving end and a tightening end, and has a plurality of cooling gas holes;
• the tightening end is an obtuse angle β, 110°≤β≤150°;
• when the diaphragm is installed in the valve chamber, the peripheral portion is attached to the sealing surface;
• the tightening ring is installed in the tightening groove of the force-applying member;
• the tightening surface applies a force F to the force-receiving end, so that the tightening end having the obtuse angle β is tightened on the peripheral portion;
• when the sealing surface is applied with the force F, it is supported by the ribbed plate structure of the annular portion, and is supported by the square portion and the flow channel side wall of the valve chamber;
• the tightening force F has a force-applying angle ε with a normal line N of a force-applying surface of the peripheral portion, and the force-applying angle ε is in the range 0°<ε≤15°.