A smart humidifier (e.g., for humidors, such as cigar humidors) has a built in refillable water tank, a wick disposed in the tank in fluid communication with liquid in the tank, and an automizer operable to convert liquid in the wick to a mist that is dispersed out of a housing of the humidifier. The humidifier includes a sensor that senses relative humidity of a space adjacent the humidifier, and a microcontroller unit controls an operation of the atomizer to adjust the humidity in the space to maintain the humidity within a preferred humidity range.

A humidifying device that adds water vapor to the surrounding air when the device is placed onto a heat source, comprising a vaporizing chamber that holds a relatively small quantity of water and a reservoir that holds a substantially greater quantity of water than the vaporizing chamber, with a support structure interposed between the reservoir and the vaporization chamber, whereby the reservoir is in communication with the vaporizing chamber and automatically adds water to the vaporizing chamber to replenish the water that is vaporized.

The invention provides a humidifier with fountaining and aroma diffusing functions, comprising a base provided with a water tank; a fountain unit comprising a water pump, water conduits and a water flow assembly; and a humidification unit. One water conduit leads water from the water tank, another one extends to reach the assembly. The assembly comprises at least one water outlet receiving and discharging water toward the water tank. A height level of the water outlet is higher than that of the water tank. The humidification unit comprises an auxiliary water tank placed in the water tank and comprising a water diversion port communicating with the water tank, an atomizer exposed in the auxiliary tank, a cap provided on the auxiliary tank, and a gas guide member corresponding to the auxiliary tank. The gas guide member comprises at least one exhaust port.

A mixed-fluid delivery device includes a piezoelectric pump that includes a piezoelectric vibrator having a piezoelectric element and a vibrating plate and a pump cabinet and discharges a fluid, and a case body including a pump housing chamber, a liquid reservoir portion, a mixing portion that generates a mixed fluid, a nozzle portion through which the gas discharged from the piezoelectric pump is ejected to the mixing portion, and a conducting portion that conducts a liquid toward the mixing portion. The case body has a reflux path through which a residual liquid that remains in the mixing portion without being delivered to the outside is returned to the liquid reservoir portion. The reflux path is provided so as to be in contact with at least a portion of the pump cabinet.