fan

Abstract

The invention discloses a draught fan. The draught fan comprises a volute and an impeller arranged in the volute. An air inlet ring is arranged at an air inlet of the draught fan. The draught fan is characterized in that the air inlet ring is arranged on the impeller and can synchronously rotate along with the impeller, and a gap is reserved between the peripheral edge of the air inlet ring and the corresponding side wall of the volute. The air inlet ring is provided with the oil filtering disc synchronously rotating with the air inlet ring. Compared with the prior art, the draught fan has the beneficial effects that due to the fact that the air inlet ring of the draught fan can synchronously rotate along with the impeller and the oil filtering disc installed on the air inlet ring can synchronously rotate along with the air inlet ring, the draught fan overcomes the defect that a gap exists between an oil filtering disc and an air inlet ring of an existing draught fan, the situation that wind on the outer side of the air inlet is not filtered by the oil filtering disc and directly enters the draught fan is avoided, and accordingly the draught fan can have a better oil filtering effect. In addition, oil drops on the oil filtering disc can be thrown out through centrifugal force generated during high-speed rotation of the air inlet ring, and therefore cleanliness of the oil filtering disc is easily kept.

Description

technical field [0001] The invention relates to a ventilation device, in particular to a fan. Background technique [0002] Existing fans all include a volute and an impeller. The impeller is installed inside the volute and rotates under the drive of the drive motor. An air inlet ring is installed at the air inlet of the fan, and the air inlet ring is fixed on the volute. Similar fan structures can refer to the following patents: "Range Hood Fan and Range Hood" as disclosed in the Chinese invention patent No. ZL 201110275861.7 (authorized announcement No. CN 102287402B). [0003] In addition, in order to improve the filtering effect of the fan, many existing fans are equipped with a filter disc at the air inlet, and the filter disc can rotate synchronously with the impeller. There is a gap between them, so that the wind outside the fan enters the inside of the fan through the gap. Since this part of the wind is not filtered by the filter disc, the filtering effect of the fa...

AI Technical Summary

Problems solved by technology

[0003] In addition, in order to improve the filtering effect of the fan, many existing fans are equipped with a filter disc at the air inlet, and the filter disc can rotate synchronously with the impeller. There is a gap between them, so that the wind outside the fan enters the inside of the fan through the gap, because this part of the wind is not filtered by the filter disc, which affects the filtering effect of the fan

In addition, during the working process of the existing fan, the oil droplets in the oil filter pan are directly thrown out of the fan under the action of centrifugal force, and cannot be collected effectively, thus affecting the cleaning of the fan and the external environment.

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