45results about How to "Improve fan performance" patented technology

A fan apparatus includes a ducted housing with an axis of rotation including a first section and a second section. The fan apparatus further includes a first plurality of vanes being radially coupled within the first section and a second plurality of vanes being radially coupled within the second section. Additionally, the fan apparatus includes an impeller with a plurality of blades rotatably disposed within the ducted housing between the first plurality of vanes and the second plurality of vanes for rotary motion about the axis of rotation. The first plurality of vanes are stationary in a first arrangement to guide an inflow of air towards the impeller. The plurality of blades are rotary in a second arrangement to have a rotational direction substantially opposite to the inflow of air guided by the first arrangement. The second plurality of vanes are stationary in a third arrangement to diffuse an outflow of air substantially along the axis of rotation.

An axial fan comprises a hub and a plurality of blades extending from the hub; wherein each blade comprises a main blade portion and a secondary blade portion and the secondary blade portion has a leading edge adjacent to a leading edge of the main blade portion and forms a flap for the main blade portion; wherein a fluid passage is defined between the leading edge of the main blade portion and the leading edge of the secondary blade portion; wherein the main blade portion has a main chord and the secondary blade portion has a secondary chord; and wherein the main chord and the secondary chord form a relative attack angle comprised between 5° and 35°.

The invention discloses a volute tongue. The volute tongue is characterized by comprising a supporting frame and a flexible volute tongue wall forming the outer contour of the volute tongue; the supporting frame comprises an upper supporting body, a lower supporting body and a variable-R column body, the upper supporting body and the lower supporting body are arranged at the root of the volute tongue, and the variable-R column body is arranged at the head of the volute tongue; the upper supporting body, the lower supporting body and the variable-R column body are distributed in a triangle shape; the volute tongue further comprises a driving mechanism used for driving the variable-R column body to rotate. The invention further discloses a centrifugal fan comprising the volute tongue. The volute tongue has the advantages that the flexible volute tongue wall of the volute tongue is supported on the upper supporting body, the lower supporting body and the variable-R column body distributedin the triangle shape; the upper supporting body and the lower supporting body are arranged at the root of the volute tongue; the variable-R column body is arranged at the head of the volute tongue;the driving mechanism drives the variable-R column body to rotate and can achieve variable-R adjustment of the volute tongue so as to change the gap between the volute tongue and an impeller; accordingly, the performance of the draught fan is improved or noise is reduced, and the volute tongue can better adapt to various actual working conditions.

A shield system adapted for use in an air cooler structure (100). The shield system includes at least one flexible sheet (304) and at least one arrangement (106) for fixing, in use, the at least one flexible sheet to an air cooler structure.

An impeller used in a fan is provided. The impeller includes a hub and a plurality of blades disposed around the hub. The hub has at least one curve-shape surface. A fan comprises a fan frame, an impeller, and a motor. The impeller disposed in the fan frame comprises a hub and a plurality of blades disposed around the hub, wherein the hub has at least one curve-shape surface and an airflow guiding structure disposed on an outer circumference of the hub. The motor is disposed in the impeller for driving the impeller.

The invention provides a multi-online draught fan control method. i draught fans are arranged, wherein i is larger than or equal to 2 and smaller than or equal to 3. The multi-online draught fan control method comprises the steps that the initial rotating speeds of the i draught fans are detected and denoted as x<ij>, wherein j is an element of a set, namely [2,i]; and the rotating speeds f<ij> ofthe i draught fans are controlled to be subjected to pulse-type periodic change based on the initial rotating speeds x<ij>, and the rotating speed change directions of the adjacent draught fans are opposite. According to the multi-online draught fan control method, the superposition action of sound waves and vibration can be effectively prevented, the good noise reduction effect is achieved, andthe property of a complete machine unit is improved.