Butterfly valve

Abstract

The present invention relates to a butterfly valve comprising a valve body (100) having a gear box (120), a disk (200) for opening and closing a pipe (101), a valve rod (300) extending from the inside of the gear case (120) and enabling the disk (200) to rotate; a screw shaft (400) mounted on the gearbox (120); and a sector gear (500) moving with the rotation of the screw shaft (400) and forming a junction projection (510) protruding in parallel with the valve rod (300). The butterfly valve of the present invention is easy to assemble a rotary arm which changes linear motion into rotary motion to prevent erroneous operation, and decentralizes the force generated in rotation, and is applicable to a large valve.

Description

technical field [0001] The present invention relates to a butterfly valve that can be equipped on various pipelines and can open and close the flow of oil body. In particular, it is easy to assemble a rotating arm that changes linear motion into rotary motion, prevents misoperation, and disperses the force generated during rotation. Butterfly valves suitable for large valves. Background technique [0002] In general, butterfly valves are constructed by connecting pipes at both ends, and a disc is installed inside the valve body that forms the pipes inside. A valve rod extending from the disc to the outside of the valve body can rotate the disc to open and close the valve. figure 1 It is a figure of the butterfly valve which the present applicant applied for. Such as figure 1 The butterfly valve of the prior art shown, comprises: internally forms pipeline 18, has the valve body 14 of gear box 12 on its one side; The disk 16 that is arranged in described pipeline 18 inside;...

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned butterfly valve of the prior art, the end of the rotating arm 22 and the valve rod 20 are fixedly combined by the key 26, and when a large force is applied, the external force is concentrated on the key 26, will cause the key 26 to crack or break

[0004] In addition, in the butterfly valve of the prior art, such as figure 2 As shown, when the rotating arm 22 is combined on the valve stem 20, there is no additional support, and it is simply fixed on the valve stem 20 in a suspended state.

Therefore, its toughness against torsion is weak, and one side of the long hole 34 of the rotating arm 22 coupled with the sector gear 30 is open, which is not suitable for applying a large force.

From this, if figure 1 The butterfly valves shown in the prior art are only suitable for small valves, not suitable for large valves that accept large forces

[0005] In addition, in the butterfly valve of the prior art, the protruding piece 40 protruding from the end of the rotating arm 22 presses the contact point of the switch 42, the rotation angle of the protruding piece 40 is small, and the contact point cannot be realized well

This will lead to malfunction, and when excessive force is applied, the life of the switch 40 will be shortened.

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