JPS60238170A - Electrostatic air purifier - Google Patents

Abstract

PURPOSE:To prevent the generation of sparking noise discharge in an electrostatic dust collection part, by arranging a filter body comprising an earthed conductive material in front of the air passage of an ionization electrode and collecting fibrous dust by said filter body. CONSTITUTION:The titled air purifier is equipped with a main body case 1 having an air sucking port 2 and an exhaust port 3, ionization electrodes 4 for applying high voltage, opposed electrodes 6 and acceleration electrodes 7 for forming high electric fields in the spaces with said electrodes 4 to generate corona discharge and forming high electric fields to each other and an air pervious filter body 12 provided so as to cover the almost all regions in front of the passages of the electrodes 4. High electric fields are formed between the filter body 12 and each electrode 4 is set to 2-5 times the short distance (l) among the distances between the electrodes 4 and the electrodes 6 or electrodes 7. By this mechanism, the generation of sparking discharge noise by fibrous dust is prevented and a period high in dust collection efficiency is availably utilized and dust collection effect is made max.

Description

[Detailed Description of the Invention] Industrial Fields of Use The present invention is applicable to general household use, automobile use, or clean-route electrostatic type. This relates to an air purifier using a dust collection method.

Conventional configuration and its problems FIG. 1 shows a conventional configuration of an electrostatic air cleaner having an ion wind generating section. 101 is the main case of the air purifier, 1
02 is an intake port for dust-containing air, and 103 is an exhaust port for clean air. Reference numeral 104 is an ionization electrode made of a tungsten wire or the like with a diameter of 6o to 1oooμ stretched over a frame 1057, and 106 and 107 are a counter electrode and an accelerating electrode made of an aluminum plate, etc., and each is connected with a metal pipe and connected at both ends. is applied to a holder made of an inorganic insulator such as ceramics, screwed together to form a dust collection electrode section, and installed on the rib 111 of the main case 101. A lid body 112 is attached to the front part of the main case 1o1 so as to be openable and closable, so that the ionization electrode section and the dust collection electrode section can be taken in and out.

The operation in this configuration will be explained.

When a high voltage is applied from the power source 113 between the ionization electrode 104 and the counter electrode 106, a corona current flows from the ionization electrode 104 toward the counter electrode 106. At this time, the ions collide with air molecules and push the air toward the counter electrode 106 side. This air flow is called ion wind. On the other hand, dust in the air is charged by ions generated by a corona current flowing between the ionization electrode 104 and the counter electrode 106. The charged dust is attracted and collected by the counter electrode 106 due to the electrostatic force generated by the high electric field generated by the high voltage applied from the power source 114 between the accelerating electrode 107 and the counter electrode 106 .

Incidentally, the form of dust adhesion on the counter electrode 106 in practical conditions is d4 in FIG. It can be classified into two types as shown in d2. In this d, charged dust is collected on the counter electrode 106 by the electric field between the ionization electrode 103 and the counter electrode, and in d2, the remaining dust not collected here is collected on the counter electrode 106. The electric field between the accelerating electrodes 107 causes the dust to be collected on the counter electrode 106 . At this time, the lifespan of the dust collecting section is determined based on the reduction in dust collection efficiency and the generation of voiced discharge due to the dust attached to the counter electrode 106, but in the case of the ion wind type dust collecting section with the above electrode structure, Since a voiced discharge caused by the dust attached as dl occurs in a very short time, it is thought that the product has reached the end of its life even though the dust collection efficiency is sufficient, and the life is extremely short. It had the disadvantage of becoming

In particular, fibrous dust has a low specific gravity and has a high probability of being collected as d, and at the same time stands upright on the electrode surface in the form of whiskers, making it easy to generate voiced discharge.

OBJECT OF THE INVENTION The present invention solves the above-mentioned drawbacks, and provides an electrostatic precipitator air purifier using ionic wind that can prevent voiced discharge caused by fibrous dust and make effective use of periods of high dust collection efficiency. That is.

Structure of the Invention The electrostatic air cleaner of the present invention includes an ionizing electrode to which a high voltage is applied, a counter electrode that forms a high electric field with the ionizing electrode, and an ion wind generating section that includes a counter electrode that is the same as the counter electrode. A filter body made of a grounded conductive material is arranged in front of the air passage of the ionizing electrode, and fibrous dust is collected in the filter body. This is to prevent voiced discharge from occurring in the electrostatic precipitator.

DESCRIPTION OF EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. 2 and 3.

1 is the main case of the air purifier, 2 is the intake port for dust-containing air,
3 is a clean air exhaust port. 4 is an ionization electrode made of a tungsten wire or the like with a diameter of 60 to 100μ stretched over the frame 5, and 6.7 is a counter electrode and an accelerating electrode made of aluminum plates, each of which is connected with a metal pipe and both ends are made of ceramic. This is applied to a holder made of an inorganic insulating material such as the like, and screwed together to form a dust collection electrode section, which is then installed on the rib 11 of the main case 1. In front of the air passage of the ionizing electrode 3, filter bodies 12 made of a grounded conductive material are arranged at intervals of 2 to 5 times the distance l to the counter electrode 6. As shown in FIG. 3, the filter body 12 in this embodiment is made of aluminum foil having a thickness of 20 to 60 μm and has a honeycomb core cross-section. Although it is held between the frames 16, these may be made of metal mesh or the like, and any conductive material with low ventilation resistance may be used. The ionizing electrode 4 section, the dust collecting electrode section, and the filter body 12 are each held separately within the main case 1, and can be taken in and out from the outside by opening and closing the lid body 16. This may be done in such a way that the filter can be taken in and out as a whole without having to open the lid.

The operation in this configuration will be explained.

When a high voltage is applied to the ionization electrode 4 by the power source 17, a high electric field is formed between the ionization electrode 4 and the grounded counter electrode 6, and a corona current flows from the ionization electrode 4 toward the counter electrode 6.

At this time, the ions collide with air molecules, sweep the air toward the counter electrode 6 side, and generate an ion wind, and the dust in the air is charged by the ions (in the case of this embodiment, it is charged to ■). The charged dust is attracted and collected by the counter electrode 6 by electrostatic force due to a high electric field formed between the accelerating electrode 7 and the counter electrode 6 by a high voltage applied by the power source 18 .

Furthermore, a high electric field is also formed between the ionization electrode 4 and the filter body 12, and ions are also generated in the opposite direction to the ventilation direction. It is forcibly charged, receives electrostatic force, and is attracted to and adheres to the filter body 12. In particular, fibrous dust such as cotton dust has a small weight compared to its surface area, so it is easily moved by electrostatic force, so a large amount of cotton dust, etc. adheres to the filter body 12, excluding dust and fine dust. It turns out.

The state of dust adhesion to the counter electrode 6 is as shown in Figure 2.
The portion 2 increases, and some dl is present, but since the fibrous dust has already been collected by the filter body 12, only fine dust remains, and it does not stand upright on the electrode surface like whiskers and generate a voiced discharge. , d2 can be used until dust adheres to the part and the dust collection efficiency decreases. In addition, the filter body 12 in this embodiment has an aperture ratio of 96 inches or more, so there is almost no initial pressure loss, and since it is thick (6 to 10 ff), it has a large dust holding capacity and can be removed and cleaned without increasing pressure loss during use. This will allow you to fully recover. The filter body 12 is arranged in front of the air passage of the ionizing electrode 4 at a distance of 2 to 5 times the distance to the counter electrode 6, thereby minimizing the reduction in the motive force and improving the dust collection effect. can be obtained to the maximum.

That is, as shown in FIG. 4, if it is too close, the wind blade will be destroyed, and if it is too far, a sufficient collection effect will not be obtained.

Furthermore, since the filter body 12 is grounded, it can also serve as protection for the ionization part to which high voltage is applied, ensuring safety compared to conventional filters that require a large distance. It is possible to downsize the device.

In this example, an electrode structure is shown in which all the dust adheres to the counter electrode, but in this case, an electric field is applied to both the counter electrode and the accelerating electrode so that the dust is dispersed and attached. The structure of the formed electrode portion as shown in FIG. 6 may be used. In other words, since the acceleration electrode 7 forms a higher electric field than the counter electrode 6 with respect to the ionization electrode 4, the dust d2 that is not collected between the ionization electrode 4 and the counter electrode 6
is attached to the accelerating electrode 7 side by electrostatic force, and as a result, the area of the dust collecting section is expanded and the period of use becomes longer.

Effects of the Invention As described above, according to the present invention, fibrous dust such as cotton dust, which causes voiced discharge, can be selectively and effectively collected before it enters the dust collecting electrode section. It can be used for a long period of time until the dust collection efficiency decreases due to fine dust, and it greatly improves the functionality of the ion wind dust collector, which is of great industrial value.

Further, according to the present invention, it is possible to set the optimum conditions for obtaining a sufficient collection effect without reducing the motive force by simply changing the distance between the ionization electrode and the filter body, which can be realized in a small size.

[Brief explanation of drawings]

Fig. 1 is a full sectional view showing the configuration of a conventional example, Fig. 2 is a full sectional view showing the configuration of an embodiment according to the present invention, Fig. 3 is a perspective view of the filter body, and Fig. 4 is an ionization electrode and a counter electrode. Ratio of distance l to distance between ionization electrode and filter body 1/L
and complementation efficiency and wind raising ′τ,. A graph showing the relationship with performance, and FIG. 6 is a full sectional view showing the configuration of another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Main case, 4...Ionization electrode, 6...Counter electrode, 7...Acceleration electrode, 12...Filter body. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure In9 Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] A main case having an intake port and an exhaust port, an ionization electrode to which a high voltage is applied, and a counter electrode that forms a high electric field between the ionization electrode and generates a corona discharge, and also forms a high electric field with each other, and an acceleration electrode. An air-permeable filter body is provided to cover almost the entire area in front of the air passage of the ionization electrode and is made of a conductive material, and is configured to form a high electric field between the filter body and the ionization electrode. , an electrostatic air purifier in which the distance between the filter body and the ionization electrode is 2 to 5 times the shorter distance between the ionization electrode and the counter electrode or the accelerating electrode.