Abstract: A frame for installing an arc-shaped LED display screen composed of a plurality of LED display modules. The top partition panel and the bottom partition panel have arc edges with the same arc, and are parallel to and spaced apart from each other and both fixed to the primary support, the secondary support, the plurality of module supports, the left support, and the right support. The left support, the right support, and the plurality of module supports are equally spaced apart and fixed along the arc edge of each of the top partition panel and the bottom partition panel, and are configured to connect the plurality of LED display modules, to achieve a seamless assemblage of the arc-shaped LED display screen.

Abstract: A frame for installing an arc-shaped LED display screen composed of a plurality of LED display modules. The top partition panel and the bottom partition panel have arc edges with the same arc, and are parallel to and spaced apart from each other and both fixed to the primary support, the secondary support, the plurality of module supports, the left support, and the right support. The left support, the right support, and the plurality of module supports are equally spaced apart and fixed along the arc edge of each of the top partition panel and the bottom partition panel, and are configured to connect the plurality of LED display modules, to achieve a seamless assemblage of the arc-shaped LED display screen.

Abstract: The present application relates to a method for seamless splicing of a special-shaped display screen, including: dividing the special-shaped display screen into a number of regular quadrilateral modules and a number of special-shaped modules; calculating a number of LED light pieces on a first side of a regular quadrilateral module after division; determining the number of the LED light pieces arranged on the first side of the regular quadrilateral module; calculating a number of LED light pieces arranged on a second side of the regular quadrilateral module, and the second side is adjacent to the first side; and continuing for the number of special-shaped modules obtained above.

Abstract: A fan central tube coupling structure includes a base and a central tube. The base has a first section and a second section that together define an upward tapered receiving recess below the base. The central tube is externally provided on around a bottom end with a first and a second protruded section and an engagement groove defined between the first and second protruded sections. The second protruded section has an interference pressing surface defined on an outermost peripheral surface thereof. The central tube is axially extended through the base, such that the second protruded section is axially press-fitted into the tapered receiving recess and the interference pressing surface is radially outward forced against the tapered receiving recess. In the meantime, the second section of the base is fitted in the engagement groove and clamped in place by between the first protruded section and the second protruded section.

Abstract: A fan central tube coupling structure includes a base and a central tube. The base has a first section and a second section that together define an upward tapered receiving recess below the base. The central tube is externally provided on around a bottom end with a first and a second protruded section and an engagement groove defined between the first and second protruded sections. The second protruded section has an interference pressing surface defined on an outermost peripheral surface thereof. The central tube is axially extended through the base, such that the second protruded section is axially press-fitted into the tapered receiving recess and the interference pressing surface is radially outward forced against the tapered receiving recess. In the meantime, the second section of the base is fitted in the engagement groove and clamped in place by between the first protruded section and the second protruded section.

Abstract: A fan impeller structure includes a main body having a central annular section, a connection section and a flow guide section. The central annular section has a through hole. The connection section has multiple connection members. Two ends of the connection members are respectively connected with the central annular section and the flow guide section. The flow guide section has a carrier annular body. Multiple fan blades are disposed on at least one side of the carrier annular body. The fan impeller structure is able to enhance the strength of the fan blades and lower the noise of the fan.