Check valve for range hood

Abstract

The invention relates to a check valve for a range hood. The check valve mainly comprises a valve [1], a valve base [4] and a hinge, wherein the valve [1] formed by pressing a metal sheet is bulged outwards in a conical shape and is provided with a convex seal surface [8]; and a concave seal surface [9] is arranged on the valve base [4]. The shape of the conical valve [1] is designed according to a principle of fluid mechanics, so the conical valve [1] cannot be lifted by wind in any directions in the closed state, namely the problem that pressure in an exhaust pipe is increased can be solved. The valve [1] can be effectively prevented from being lifted and flapped outdoors; the valve [1] made of the metal sheet has light weight and meets the requirement of valves; and by the valve [1] made of metal, the defect of high possibility of aging of plastic valves can be overcome, and the reliability of the valve [1] which is used for a long time is ensured. The check valve can meet requirements of different users indoors and outdoors simultaneously, and has the characteristics of simple structure and is convenient and reliable.

Description

technical field [0001] The utility model relates to a check valve installed at the outlet of an exhaust pipe to prevent backflow. Background technique [0002] Since there has been range hoods, the check valve of range hoods has technical defects all the time, and it can also be said to be a technical problem that has not been solved for a long time. The check valve of the current range hood is generally installed on the range hood. This valve is too close to the impeller, and the oil thrown by the impeller often sticks the valve and cannot be opened or closed. In order to avoid this kind of thing, the designer designed the valve as a valve with a gap, that is, the valve plate and the valve seat are in point contact, but when the oil particles continuously thrown by the impeller gather too much, the fault of sticking to the valve will still occur . In fact, the main reason why the oil-stained valve cannot be opened is the structural problem of the valve, because the valve ...

AI Technical Summary

Problems solved by technology

The check valves specially designed for it now adopt the off-axis design scheme, that is, the valve is large on one side and small on the other side. This structure cannot guarantee a complete sealing surface, so the sealing effect is not good. In addition, this flat type The gravity generated by the valve structure in the vertical state is too small, and the closing ability is not reliable

There is also a valve that uses spring force to close, but one more such part is easy to cause failure

Simple and reliable design principles are the designer's ideal, but the designer has not been able to find an ideal solution for a long time

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