The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.

A positive and negative oxygen ion air purification system uses dielectric barrier discharge for rail transport. The system includes: an air intake device including a first damper and second damper, wherein the first damper is in communication with the second damper; an evaporator disposed within the air intake device, wherein gas flowing through the first damper and second damper passes through the evaporator; a purification device, wherein gas flowing through the first damper and second damper passes through the purification device, wherein the purification device includes a mounting plate, a power supply module and an ion generation module, the purification device is disposed on the air intake device by the mounting plate, and the power supply module includes an input end, a transformer, and an output end; a detection device; and a control device connected to the detection device, the air intake device and the purification device.

Bipolar ionizer circuit includes a high voltage AC voltage generator having a high potential output and a low potential output, the high potential output being capacitively coupled to respective high potential inputs of a pair of mutually opposite polarity voltage multipliers and the low potential output being capacitively coupled via an auxiliary capacitor to respective low potential inputs of the voltage multipliers. Outputs of the voltage multipliers are connected to respective ionizing electrodes, and an external ion imbalance indicator is connected in parallel to the auxiliary capacitor, which is thereby able to provide automatic balance of the ion current.

An air conditioning apparatus according to an aspect of the present invention includes a main body including a suction part through which air is suctioned and a discharge part through which the air suctioned through the suction part is discharged, a fan disposed in the main body to allow the air to flow, an electric charge device coupled to the main body outside the main body to charge dust in the air, and a filter device disposed between the suction part and the discharge part in the main body to collect the charged dust particles.

A filter module and an air purifier according to an aspect of the present disclosure include a supply roller and a recovery roller, a filter wound and installed on the supply roller and the recovery roller, so that it can be used without replacing and cleaning the filter module for a long period of time by allowing a section used in the filter to be recovered in the recovery roller, and also a section not used in the filter to be supplied from the supply roller.

The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.

Provided is an air conditioning apparatus. The air conditioning apparatus includes a main body having a suction part through which air is suctioned and a discharge part through which the air suctioned through the suction part is discharged, a fan disposed within the main body to allow the air to flow, a filter device disposed between the suction part and the discharge part within the main body, the filter device including a filter including a plurality of arrays that are spaced apart from each other, and a power supply part to supply a voltage to each of the arrays. Each of the arrays includes a conductive member, the conductive member contacts a dielectric containing a dielectric material.

A portable air filtration apparatus capable of rapid and efficient room air turnover and recirculation of filtered and decontaminated air with eradication of both microorganisms and biological agents. The invention relates to a compact device that can be used in ultra-clean air purification using a multi stage electrostatic precipitation and air filtration with disinfection and eradication of both microorganisms and biological agents by the application of ultraviolet light radiation. It can be used in any application where space, lower cost or ultra-fine particulate filtering is needed; such as in clean rooms and surgical suites. The device is extremely efficient for purifying contaminated air from entrained dust and organic substances without using chemicals and physical filters, and it is hygienic and fireproof. The device including its multi stage electrostatic precipitator with the filter, connecting, releasing tubes and the fan is easy to clean and can be portable.

An air conditioner includes a dust collection sheet including a first electrode and a second electrode separated from the first electrode and facing the first electrode, and to collect particles in air, a power supplier electrically connected to the first and second electrodes, and a controller configured to control the power supplier to apply a direct current (DC) voltage to the first electrode to perform a dust collecting operation, determine to perform at least one of a first sterilizing operation at a preset first temperature for a first period of time and a second sterilizing operation at a second temperature higher than the first temperature for a second period of time shorter than the first period of time, and control the power supplier to apply an alternate current (AC) voltage to the first electrode and the second electrode for the first sterilizing operation or the second sterilizing operation.

An electric dust collecting device and an air conditioner having the same are disclosed. The electric dust collecting device includes a first filter unit including a plurality of discharge electrode plates which are spaced apart from each other and have spaces defined therebetween, a high voltage generator electrically connected to all of the plurality of discharge electrode plates, and a second filter unit disposed downstream of the first filter unit in an air flow direction and connected to a ground to cause corona discharge between the discharge electrode plates and the second filter unit, whereby particles electrically charged by corona discharge are collected at the second filter unit. The first filter unit has a simplified structure, and cleaning effect is improved.