A top air-outlet device, comprising a top cover assembly , a top air-outlet assembly , a detection mechanism , an adjustment mechanism and a controller; wherein the top air-outlet assembly is capable of ascending and descending with respect to the top cover assembly , such that an air outlet of the top air-outlet assembly can be opened or closed by the top cover assembly ; the adjustment mechanism is disposed on one of the top air-outlet assembly and the top cover assembly , the detection mechanism is disposed on the other one of the top air-outlet assembly and the top cover assembly ; when the top air-outlet assembly is ascended or descended with respect to the top cover assembly , the adjustment mechanism and the detection mechanism can be close to or away from each other; the adjustment mechanism has an expanding-retracting elasticity; in the process of the ascending and descending motion of the top air-outlet assembly with respect to the top cover assembly , when the adjustment mechanism touches the detection mechanism , characterized in that : the controller is configured to control an ascending and descending motion of the top air-outlet assembly with respect to the top cover assembly ; the detection mechanism sends a detection signal to the controller to make the controller control the top air-outlet assembly to continue moving within an elastic expanding-retracting range of the adjustment mechanism after the top air-outlet assembly reaches a closed position. wherein the top air-outlet assembly is capable of ascending and descending with respect to the top cover assembly , such that an air outlet of the top air-outlet assembly can be opened or closed by the top cover assembly ; the adjustment mechanism is disposed on one of the top air-outlet assembly and the top cover assembly , the detection mechanism is disposed on the other one of the top air-outlet assembly and the top cover assembly ; when the top air-outlet assembly is ascended or descended with respect to the top cover assembly , the adjustment mechanism and the detection mechanism can be close to or away from each other; the adjustment mechanism has an expanding-retracting elasticity; in the process of the ascending and descending motion of the top air-outlet assembly with respect to the top cover assembly , when the adjustment mechanism touches the detection mechanism , characterized in that : the controller is configured to control an ascending and descending motion of the top air-outlet assembly with respect to the top cover assembly ; the detection mechanism sends a detection signal to the controller to make the controller control the top air-outlet assembly to continue moving within an elastic expanding-retracting range of the adjustment mechanism after the top air-outlet assembly reaches a closed position. the controller is configured to control an ascending and descending motion of the top air-outlet assembly with respect to the top cover assembly ; the detection mechanism sends a detection signal to the controller to make the controller control the top air-outlet assembly to continue moving within an elastic expanding-retracting range of the adjustment mechanism after the top air-outlet assembly reaches a closed position. <EOS>