Valve flap structure and double-flap type check valve

Abstract

The invention discloses a valve flap structure and a double-flap type check valve. The valve flap structure comprises a fixed shaft, a first valve flap, a second valve flap and an isolation assembly. The first valve flap and the second valve flap are provided with a first shaft lug and a second shaft lug. The first shaft lug and the second shaft lug are both arranged on the fixed shaft in a sleeving mode. The second shaft lug is located above the first shaft lug. The isolation assembly is connected to the part, between the first shaft lug and the second shaft lug, of the fixed shaft in a sleeving mode, the top of the isolation assembly supports the second shaft lug, and a gap is reserved between the bottom of the isolation assembly and the first shaft lug; or the side wall of the first valve flap is provided with a first top shaft lug and a first bottom shaft lug, the side wall of the second valve flap is provided with a second top shaft lug and a second bottom shaft lug, the second top shaft lug is located above the first top shaft lug, the second bottom shaft lug is located above the first bottom shaft lug, and the isolation assembly is arranged between the first bottom shaft lug and the second bottom shaft lug. The double-flap type check valve comprises the valve flap structure. The isolation assembly transmits the gravity of the second valve flap to a valve body. The first valve flap does not bear the gravity of the second valve flap. When the valve is opened or closed, the torque needed by the first valve flap is reduced.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a disc structure and a double-disc check valve. Background technique [0002] Due to its compact structure, small installation space and light weight, double-disc check valves are widely used in gas-liquid pipeline systems. The structure of the double disc check valve in the prior art is mostly as the check valve disclosed in the Chinese patent document CN104165237A, which includes a valve body with an inner cavity, a partition arranged in the inner cavity, and the partition divides the inner cavity along the valve body. Axially divided into two areas, two symmetrical installation holes are formed on the partition; along the radial direction of the valve body, a fixed shaft is arranged in the inner cavity and on the inner wall surface between the two installation holes; the left valve The valve disc and the right valve disc are symmetrically arranged on the fixed shaft in the inn...

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Problems solved by technology

[0004] However, in the check valve with the above-mentioned structure, two lugs are arranged on the side walls of the left disc and the right disc near the fixed shaft, which are respectively the top lug and the bottom lug, and the two lugs of the left disc are respectively Set on the fixed shaft, the two lugs of the right valve disc are respectively sleeved on the fixed shaft, and the lugs of the right valve disc are located above the lugs of the left valve disc, and the two lugs of the right valve disc are respectively pressed on the On the two lugs of the left disc, the gravity of the right disc is transmitted to the lugs of the left disc through the two lugs. When the valve is opened or closed, the friction force on the left disc is very large, resulting in When the valve clack is opened or closed, the required torque is large, which makes it difficult to open or close the check valve; at the same time, the left valve clack is subjected to a large torque during the rotation process, which may easily cause damage to the sealing surface of the left valve clack, resulting in check valve failure. The sealing performance of the valve is reduced

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