An ionizer with a built in filament cathode and an anode is presented in the patent description PL no 169029. The cathode is placed inside the chamber in the shape of a rectangular prism made from two side insulating walls. The cathode's leads are fitted to these walls and are galvanically connected with the heat sinks placed on the side insulating walls. The other walls of the chamber that make the anode are made of conducting material.

Another ionizer, described in the polish patent application no P. 333029, has a filament cathode which is flowed around by water vapour or water mist. The cathode is placed in a tube that makes an anode. Electrons emitted by the cathode penetrate water vapour or water mist molecules, thus create negative ions that are carried into the environment by the stream of air brought in through the air intake.

The ionizer, according to the invention includes an anode, designed in any surrounding type shape and filament cathode can be placed in it and equipped with leads with heat sinks at both ends. There is a fan fitted coaxially with the filament cathode in the axis of the anode, before the left heat sink. The left heat sink is permanently connected with the left shield, placed from the side of the filament cathode, by means of insulating pins. The right heat sink is permanently connected with the right shield, placed from the side of the cathode, by means of insulating pins. The left heat sink and the right heat sink as well as the left shield and the right shield are made of material conducting electric current. Both shields are equipped with holders that conduct electric current as well as make a galvanic connection with the anode. Both heat sinks and the shields are constructed the shape of disks with holes that provide laminar flow of air stream forced by the fan, and the areas of the central sections of both heat sinks are bigger than the areas of the central openings in both shields so that the stream of air could not cool the filament cathode.

The shields eliminate electric field interference at the filament cathode created by the heat sinks and the fan as they increase the electric field intensity on the surface of the filament cathode thus making the quantity of emitted electrons higher. The use of the fan allows the convection of heavy, low-activity negative ions generated as a result of binding emitted electrons with water mist molecules, into surrounding space effective. The use of the ionizer improves the climate comfort especially in rooms with installed computers because it neutralizes the positive ions generated by the monitor of the computer.

The subject of the invention is shown in the Fig. 1 presenting the perspective view of the ionizer.

The filament cathode 2 equipped with the leads 3 at both ends is placed in the tube that makes the anode 1. The fan 5 is fitted in front of the left heat sink 4, in the axis of the anode 1. The left heat sink 4 is permanently connected with the left shield 7 placed from the side of the filament cathode 2 by means of insulating pins 6. The right heat sink 8 is permanently connected with the right shield 9 placed from the side of the filament cathode 2 by means of insulating pins 6. The left shield 7 and the right shield 9 as well as the left heat sink 4 and the right heat sink 8 made of aluminium, are circular disks with holes 10. The left shield 7 and the right shield 9 are equipped with the aluminium holders 11 conducting electric current that make a galvanic connection of the anode 1 with both shields 7 and 9. The left shield 7 and the right shield 9 have central openings 12 for leads 3 of the filament cathode 2. The left heat sink 4 and the right heat sink 8 are equipped with the central section 13 of the area bigger than the area of the central openings 12 of both shields 7 and 9.

The filament voltage is connected to the leads 3 of the filament cathode 2. High voltage accelerating emitted electrons from the filament cathode is put between the anode 1 and one of the leads 3. The penetration of electrons into the molecules existing in the stream of air generated by the fan 5 creates negative ions. The stream of air generated by the fan 5 carries the negative ions outside the ionizer.