Backflow suppression device and backflow prevention fan, refrigerator containing the backflow suppression device

By installing a backflow suppression device with a flow damper and a limiter at the air inlet of the fan, the problem of gas backflow in the positive pressure zone of the fan is solved, improving the fan's air delivery efficiency and uniformity, and reducing energy consumption and noise.

CN122565729APending Publication Date: 2026-08-14NINGBO FOTILE KITCHEN WARE CO LTD
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Patent Information

Application Number
CN202610984036.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-03
Publication Date
2026-08-14

AI Technical Summary

Technical Problem

In existing duct systems, when one side of the damper is open, the other side's damper is closed, causing backflow of gas in the positive pressure zone, which leads to reduced fan efficiency, increased energy consumption, and increased noise.

Method used

A backflow suppression device is adopted, including a flow suppression part and a limiting part. The flow suppression part rotates at the outer edge of the air inlet to block backflow in the positive pressure zone, and the limiting part restricts the rotation position of the flow suppression part to prevent gas from flowing back to the outside of the fan, thereby reducing eddies and noise.

Benefits of technology

It improves the air delivery efficiency and uniformity of the fan, reduces energy consumption and noise, reduces redundant work, and increases the air delivery volume.

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Abstract

This invention discloses a backflow suppression device and an anti-backflow fan and refrigerator including the same. The backflow suppression device is used to suppress the backflow of gas from the air inlet of the fan to the outside of the fan. It includes: a flow-suppressing part, which is arranged around the outer edge of the air inlet, with one side of the flow-suppressing part rotatably connected to the outer edge of the air inlet, and the other side of the flow-suppressing part extending towards the axis of the air inlet, and the flow-suppressing part being used to rotate around the outer edge of the air inlet; and a limiting part, which is arranged around the outer edge of the air inlet, and the limiting part being used to restrict the rotation of the flow-suppressing part towards the outside of the fan. When gas backflows from the air inlet, the flow-suppressing part rotates towards the limiting part; when air enters the air inlet, the flow-suppressing part rotates towards the impeller of the fan. The flow-suppressing part can block the backflow generated in the positive pressure zone, thereby reducing eddies and the noise generated by eddies. It reduces repetitive work, thereby improving the efficiency of the fan and reducing energy consumption.
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