JPH07102964B2 - Rotary ozonizer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary ozone generator (hereinafter referred to as a rotary ozonizer), and more particularly to a rotary ozonizer excellent in cooling of a dielectric.

[Prior Art] In the rotary ozone generator disclosed in Japanese Patent Laid-Open No. 63-218503, the impeller is used as a discharge electrode, the case surrounding the impeller is used as an induction electrode, and the inner surface of the case is covered with a dielectric material. By generating an AC discharge between the two electrodes to generate ozone, the ozone generator and the ozone blower, which have been conventionally separated, are integrated with each other, and the device is made compact.

[Problems to be Solved by the Invention] There is a problem that dust or nitrate is apt to adhere to the surface of the dielectric, and the adhesion causes the discharge path to concentrate on a specific portion of the surface of the dielectric, resulting in overheating of the dielectric. By overheating
There are drawbacks such that cracks and insulation deterioration occur in the dielectric, or the ozone generation efficiency decreases.

In the rotary ozone generator described above, the discharge electrode rotates at a high speed, so that the discharge electrode is cooled well. However, the dielectric material that requires the most cooling is only cooled by the blown air at a relatively low speed from the impeller, and therefore overheats as the current density increases.

The present invention has been made in view of such problems, and it is an object to be solved to provide an ozonizer having excellent cooling properties of a dielectric and easily increasing the air flow rate.

[Means for Solving the Problem] A rotary ozonizer of the present invention is a centrifugal blower type case including a cylindrical peripheral wall and side walls closing both ends thereof, and a peripheral wall that is rotatably supported by the side wall and faces the peripheral wall. A cylindrical metal whose blade portion is also an induction electrode, a dielectric material adhered to the surface of the induction electrode, and an inner peripheral surface of the peripheral wall with a predetermined interval therebetween. It is characterized by including a discharge electrode formed of a mesh and a high-voltage power supply unit connected between both electrodes.

[Operation] When an alternating high voltage is applied between both electrodes, discharge is generated in the gap between both electrodes and the surface of the dielectric material, and ozone is generated.

The high-speed airflow sent out from the rotating impeller in the centrifugal direction and the rotation direction is guided by the peripheral wall of the case together with the generated ozone to swirl and blow out to the outside.

Further, the high-speed airflow moves at a relatively high speed with respect to the blade and the dielectric, cools the dielectric, and further blows off dust and nitrates on the surface of the dielectric.

Further, in the present invention, since the discharge electrode is made of a cylindrical metal mesh that is provided at a predetermined distance from the inner peripheral surface of the peripheral wall, the air flow rate can be increased by reducing the fluid resistance, and the cooling capacity can be increased. Is improved.

To further explain, when discharging is performed between the induction electrode composed of the blade portion of the impeller and the discharge electrode surrounding the induction electrode, the gap between both electrodes has a very high withstand voltage of air and a high voltage power supply unit. Since there are various restrictions on the increase in generated voltage, it becomes a value of, for example, several mm or less. Therefore, it is difficult to obtain a large air volume with the conventional structure. Was difficult. On the other hand, according to the present invention, the discharge electrode is formed of a metal net through which the air flow blown out from the impeller can smoothly pass, and the passage of the swirling air flow is provided between the metal net and the inner peripheral surface of the peripheral wall. Since it is provided, the fluid resistance can be reduced and the output air volume can be increased without increasing the voltage generated by the high-voltage power supply unit required for silent discharge.

[Embodiment] An embodiment of the rotary ozonizer of the present invention will be described with reference to FIGS. 1 and 2.

This rotary ozonizer has a cylindrical case 1 made of resin with one end opening consisting of a peripheral wall 11 and a side wall 12, and this opening is closed by a lid 2 having a bottom with one end opening. Further, a discharge electrode 5 made of a metal mesh and having a cylindrical shape is interposed between the inner peripheral surface of the peripheral wall 11 and the inner peripheral surface at a predetermined interval. The discharge electrode 5
Are supported by insulating protrusions (not shown) protruding from the peripheral wall 11 in the inner diameter direction. As shown in FIG. 2, the side wall
Eight air inlets 13 are radially formed at 12 and an air supply port 14 is opened at one end of the peripheral wall 11.

On the inner side surface of the side wall 12, the motor 3 is installed with the output shaft 35 aligned with the axial center of the peripheral wall 11.

A resin pipe 32 projects from the side surface of the motor 3 in parallel with the axis through a hole opened in the side wall 12 of the cylindrical case 1, and a resin-coated motor drive wire 33 is externally provided from the pipe 32.
34 and ground wire 72 are exposed. The motor 3 is a 100V single-phase induction motor, and the motor drive lines 33 and 34 have 50 to 60
Hz commercial AC power supply is connected.

The output shaft 35 of the motor 3 extending to the lid 2 side is
An impeller 4 made of a good conductor metal having a sirocco fan shape is fixed, which is composed of a disc 41 extending at a right angle to 35 and a blade 42 extending from the outer peripheral portion of the disc 41 in parallel with the axis. The blade 42 also serving as an induction electrode extends in the reverse swirl direction from the axis as shown in FIGS. 2 and 3, and the outer edge of the blade 42 and the discharge electrode 5
The void portion 70 between the inner peripheral surface of the tubular case 1 and the electrode 5 is provided with a gap 70 between the inner peripheral surface of the tubular case 1 and the electrode 5. It is a guidance space that guides to the mouth 14.

As shown in FIG. 3, the surface of the blade 42 has a wall thickness of 0.5 to 1.5.
A glass dielectric 6 having a thickness of
Is a disc 41 of the impeller 4, an output shaft 35 made of metal, a slip ring (not shown) fixed to the output shaft 35, and a fixed carbon brush (not shown) slidably contacting the slip ring, It is electrically connected to the ground wire 72. The ground wire 72 is connected to the low-voltage output terminal of the AC high-voltage power supply section 7, and the high-voltage output terminal of the AC high-voltage power supply section 7 is connected to the discharge electrode 5 via the high-voltage wire 71. If the slip ring and each blade 42 of the impeller 4 are connected by a copper wire, the effect of reducing the wiring resistance can be obtained.

Next, the operation of this rotary ozonizer will be described.

When the motor 3 is rotated and an AC high voltage of about 1 KHz is applied to the discharge electrode 5, AC discharge is generated in the space 70 between the electrodes and the surface of the dielectric 6, and ozone is generated. Further, centrifugal air is blown from the intake port 13 to the air supply port 14 by the impeller 4,
The generated ozone is sent to the external target space.

According to this embodiment, even if the discharge electrode 5 is brought close to the outer edge of the blade 42 for the purpose of lowering the discharge voltage, the airflow blown out from the blade 42 passes through the discharge electrode 5 and the annular airflow guide portion is widely spaced. Since it is possible to swirl through 73, it is possible to reduce the fluid resistance, increase the air volume, and improve the cooling capacity.

It should be noted that other power transmission means such as a rotary transformer may be used instead of the above-mentioned conductive means composed of the slip ring and the carbon brush. In this case, the output transformer of the high voltage generator can be omitted by setting the step-up ratio of the rotary transformer to be high.

Also, various ceramics and resins can be adopted as the material of the dielectric. Furthermore, the dielectric 6 may be applied to at least the portion of the blade 42 facing the discharge electrode.
It does not have to be applied to the entire surface of 42. Also, the dielectric 6
A dielectric may be embedded in the blade 42 in a wedge shape in order to strengthen the bond between the blade and the blade 42. However, since an increase in the film thickness of the dielectric 6 causes a decrease in the amount of charge, the film thickness should be appropriate considering the life.

[Effects of the Invention] As described above, in the device of the present invention, since the surface of the induction electrode provided on the impeller is coated with the dielectric, the cooling property of the dielectric is high, and the surface of the dielectric is high. It is possible to prevent dust and nitrates from adhering to the electrode, and as a result, the durability of the dielectric is significantly improved, and the current density per unit area of the induction electrode layer is increased, resulting in a small and large output. The ozonizer becomes feasible.

Further, in the present invention, since the discharge electrode is made of a substantially cylindrical metal net interposed between the inner peripheral surface of the peripheral wall and the blade portion of the impeller at a predetermined interval, the air flow rate is reduced by reducing the fluid resistance. It becomes possible to increase the cooling capacity.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a rotary ozonizer according to an embodiment of the present invention as seen in a direction perpendicular to the axial direction, and FIG. 2 is a schematic sectional view of the device of FIG. 1 seen from the axial direction, and FIG. FIG. 3 is a partially enlarged sectional view of FIG. 1. 1 ... Cylindrical case (case) 2 ... Lid (case) 3 ... Motor 4 ... Impeller 42 ... Wing (induction electrode) 5 ... Discharge electrode 6 ... Dielectric 7 ... AC high-voltage power supply Department

 ─────────────────────────────────────────────────── --- Continuation of front page (72) Inventor Takashi Hyogo 2-chome Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corporation (56) Reference JP-A-63-218503 (JP, A) Sho 62-153104 (JP, A)

Claims (1)

[Claims] 1. A centrifugal fan type case comprising a cylindrical peripheral wall and side walls closing both ends thereof, and an impeller in which a blade portion rotatably supported by the side wall and facing the peripheral wall also serves as an induction electrode. A dielectric material adhered to the surface of the induction electrode, and a discharge electrode formed of a cylindrical metal net interposed at a predetermined distance between the inner peripheral surface of the peripheral wall and the electrodes. A rotary ozonizer characterized by including a connected high-voltage power supply unit.