The present disclosure belongs to the technical field of farm irrigation, and particularly relates to a novel pressureless irrigation device. The novel pressureless irrigation device of the present disclosure uniformly conveys irrigation water to crop plant root systems on the basis of a connector principle; and the size of a flow cross-section necessarily satisfies the extremely-low flowing speed requirement of lossless conveyance for the connector in a static pressure dominant operating state, thereby eliminating a problem of irrigator blockage which accompanies energy dissipation. Water enters the atmosphere via transpiration of crop plants, and a water supply water level control pool at a head portion is triggered to replenish the water. The water consumption and water replenishment are adaptive, and human intervention and additional energy are not required, thereby realizing low-cost and fool-proof automatic irrigation and true sense of uniform irrigation.

The present disclosure belongs to the technical field of farm irrigation, and particularly relates to a novel pressureless irrigation device. The novel pressureless irrigation device of the present disclosure uniformly conveys irrigation water to crop plant root systems on the basis of a connector principle; and the size of a flow cross-section necessarily satisfies the extremely-low flowing speed requirement of lossless conveyance for the connector in a static pressure dominant operating state, thereby eliminating a problem of irrigator blockage which accompanies energy dissipation. Water enters the atmosphere via transpiration of crop plants, and a water supply water level control pool at a head portion is triggered to replenish the water. The water consumption and water replenishment are adaptive, and human intervention and additional energy are not required, thereby realizing low-cost and fool-proof automatic irrigation and true sense of uniform irrigation.

The present invention discloses a dehumidifier and a float assembly thereof, wherein the float assembly comprises a float, a press plate, a suction pipe, and a rotation shaft. The float, the suction pipe, and the press plate are fixedly connected to the rotation shaft respectively, and the suction pipe and the float are arranged at the same side of the rotation shaft, so that the suction pipe is driven by the float to synchronously rise up or fall down along with variation of water level of a water tank; the press plate is driven by the float to control a draining pump to drain when the water tank is at the high water level, thereby realizing automatic drainage. The present invention doesn't need to dispose both a fixed water tank and a movable water tank.