258results about How to "Improve ventilation effect" patented technology

A metal 3D printer includes: a housing (1) forming a molding chamber (1B); a recoater head (3) reciprocating in the direction of a horizontal U axis in the molding chamber to form a powder layer of a metal; a laser irradiation device (9) irradiating an irradiation region in the powder layer with a laser beam to form a sintered layer; and an inert gas supply device (4). The inert gas supply device includes: a first suction port (V1) disposed on one (14) of the side walls facing each other in the direction of the U axis, which is far away from the irradiation region; a first blowout port (F1) disposed on a side of the recoater head to face the first suction port; and a second blowout port (F2) disposed to face the first suction port across the irradiation region.

The invention relates to the technical field of exhaust fans and particularly relates to a conveniently-cleaned exhaust fan comprising a fan body, a driving shaft, a first rotating motor and a fan frame with a cylindrical cavity; the fan frame is fixedly connected with fixed rods, the fan body comprises fan blades and a turntable, guide holes are formed in the side wall of the turntable connected with the first rotating motor by the driving shaft, the first rotating motor is connected with one of the fixed rods, the fan blades are fixedly connected with the turntable, and the sides of the fan blades are provided with sliding rails; the fan blades are slidably connected with cleaning parts in which strip-shaped holes are further formed, the inner walls of the strip-shaped holes are provided with bulges in sliding fit with the sliding rails, and each cleaning part is further fixedly connected with a connecting line; the other fixed rod is fixedly connected with a second rotating motor on which a locating shaft is arranged, a through hole is formed in the center of the turntable, the locating shaft is rotatably connected with the turntable after passing through the through hole, and the connecting lines are fixedly connected with the locating shaft. By using the conveniently-cleaned exhaust fan, the problem that time and labor are wasted because an existing exhaust fan is required to be manually cleaned can be solved.

This vehicular air-conditioning device is capable of executing pre-conditioning for initiating air-conditioning in a passenger compartment before an occupant enters the vehicle and is provided with a pre-conditioning control part (218). The pre-conditioning control part is capable of setting: a pre-conditioning blowing operation mode wherein a blower (130) is operated while operation of a compressor (141) is prohibited, the introduction mode is set to an outside air introduction mode, the output of the blower (130) is set to maximum, and furthermore a face-foot mode is set as the blowing mode; and a pre-conditioning operation mode wherein the blower (130) and compressor (141) are operated, and the blower (130), compressor (141), introduction mode, and blowing mode are automatically set in accordance with a target blowing temperature (TAO). When executing pre-conditioning, the vehicular air-conditioning device executes the pre-conditioning blowing operation mode before executing the pre-conditioning operation mode and starts executing the pre-conditioning operation mode on the basis of the difference between the inside temperature (Tr) in the passenger compartment and the ambient temperature (Tam) outside the vehicle and / or the rate of change in the difference.