JPH0777961B2 - 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] A rotary ozonizer disclosed in Japanese Patent Laid-Open No. 63-218503 uses a vane of a centrifugal blower such as a sirocco fan as a discharge electrode, and a case surrounding it as an induction electrode, and an inner surface of the case. By depositing a dielectric and generating an AC silent discharge between both electrodes to generate ozone, the ozone generator and the ozone blower, which were separate in the past, are integrated to achieve a compact device. There is.

[Problems to be Solved by the Invention] However, the conventional rotary ozonizer described above still contains the following problems.

The problem is with cooling the dielectric. Since the annular space between the impeller of the centrifugal blower and the case surrounding it is a swirl passage for the air flow blown out from the impeller, it is necessary to gradually increase the cross-sectional area toward the downstream side thereof. If a sufficient cross-sectional area is not secured, that is, if the radial gap between the outer peripheral edge of the centrifugal blade and the inner peripheral surface of the dielectric is small, the fluid resistance of the swirl passage increases and the flow deteriorates. Dielectric is not sufficiently cooled. However, for AC silent discharge, it is advantageous in terms of economy and electrode durability that the radial gap is narrower, for example, 2 mm or less, because the discharge voltage can be reduced. Therefore, it is impossible to achieve both dielectric cooling and discharge voltage reduction.

It is important to cool the dielectric heated by the creeping discharge, and if the dielectric overheats, the ozone generation efficiency will decrease,
Further, there arises a problem that cracks or insulation deterioration occur in the dielectric.

The present invention has been made in view of such problems, and an object thereof is to provide an ozonizer having excellent cooling properties of a dielectric.

[Means for Solving the Problems] A rotary ozonizer of the present invention has a cylindrical shape, a case in which an outlet is opened in a tangential direction from a part of a cylindrical wall, and the rotary ozonizer rotates along an inner peripheral surface of the cylindrical wall. An impeller having a centrifugal blade that also serves as a first electrode, an arc-shaped second electrode disposed with a predetermined gap from the outer peripheral edge of the impeller, and one of the first and second electrodes covered. And a high-voltage power supply for applying an AC silent discharge voltage between the first and second electrodes, the second electrode being a perforated electrode disposed at the outlet. Consists of.

[Operation] When an AC high voltage is applied between both electrodes, discharge is generated in the gap between both electrodes and the surface of the dielectric, and ozone is generated.
The high-speed airflow sent from the rotating impeller in the centrifugal direction and the rotational direction is guided by the peripheral wall of the case together with the generated ozone, and swirls to reach the blowout port, and reaches the hole of the second electrode provided at the blowout port. It penetrates and blows out.

In addition, the swirl passage between the outer peripheral edge of the impeller and the inner peripheral surface of the case can have a sufficient cross-sectional area, and at the outlet, it blows out through the second electrode, so that the air flow is obstructed. Never.

Therefore, regardless of whether the dielectric is applied to the first electrode or the second electrode, the airflow at a high speed and with a sufficient air volume cools the dielectric well.

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

The rotary ozonizer includes a sirocco fan 1 having an ozone generating function, a motor 2 for driving the sirocco fan 1, and a high voltage power supply 8 for supplying a high frequency high voltage to the inside of the sirocco fan 1.

The sirocco fan 1 includes a base cylinder portion 10 having a bottomed cylindrical shape and a base cylinder portion.
The motor 2 has a lid 11 for closing the opening of 10, and the motor 2 is fastened and fixed to the outer surface of the lid 11.

The shaft 21 of the motor 2 penetrates through the central portion of the lid 11 and extends along the axis of the base cylinder portion 10. The shaft 21 has a cantilever type centrifugal blade 31 that also functions as the first electrode. The impeller 3 is attached. Two dielectrics 4 made of a resin ring are fitted to the outer circumference of the impeller 3, that is, the outer peripheral edge of each centrifugal blade 31. The width of each dielectric 4 in the axial direction is formed to be much smaller than the width of the impeller 3 in the axial direction, and the thickness of the dielectric 4 in the radial direction is 2 mm. The gap between the outer peripheral edge of each centrifugal blade 31 and the inner peripheral surface of the base tube portion 10 is a swirl passage 40 for the air flow.
And the radial distance between them is designed to be about 4 to 10 mm. In FIG. 1, the central portion of the left end face of the impeller 3 is an air inlet 32 to the impeller 3, and the right end face of the impeller 3 is shielded.

The base cylinder part 10 is provided with an air blow-in port 12 facing the air blow-in port 32 of the impeller 3, and the peripheral wall of the base cylinder part 10 is cut out to form a blow-out port 13 for sending. It communicates with the cylinder 14 (see Fig. 2). The discharge electrode 13 has an arc-shaped second electrode 5
Are concentrically attached at a distance of about 1 to 2 mm from the outer peripheral edge of the centrifugal blade 31.

As shown in FIG. 3, the second electrode 5 is formed in a ladder shape and has a plurality of rectangular openings 51. A pair of resin bars 52 extend from both sides of the second electrode 5 on both sides of the axis and the closing direction, and the tips of these resin bars 52 are bent outward to form the bottom surface of the lid 11 and the base tube portion 10. It is fastened by screws 54. The hole of the resin bar 52 through which the screw 53 is inserted is a long hole 53 that functions as a play hole. Therefore, the second electrode 5 is insulated from the case, that is, the base tube portion 10 and the lid 11 by the resin bar. Then, the screw 54 is loosened and the second electrode 5
By moving in the radial direction, the discharge interval between the outer peripheral edge of the centrifugal blade 31 and the second electrode can be adjusted.

On the other hand, at the tip of the shaft 21 of the motor 2, a current collector contact 6 made of a small-diameter titanium rod is provided so as to protrude along the shaft center.
A through hole 15 is formed in the central portion of 10 along the axis. A carbon rod slider 16 and a coil spring are provided in the through hole 15.
After 17 is inserted, it is sealed by a copper terminal 18. The slider 16 has a large diameter head, and the large diameter head is pressed against the current collector contact 6 by a coil spring 17.

The ground-side output end b of the high-voltage power supply 3 is connected to the impeller 3 via the terminal 18, the coil spring 17, the slider 16, the collector contact 6, and the shaft 21.
Is grounded, and the high-voltage output end a of the high-voltage power supply 3 is connected to the second electrode 5 via an insulating covered wire (not shown).

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

When the motor 2 is rotated and an AC high voltage of about 1 KHz is applied between the electrodes 31 and 5, a creeping discharge is generated in the gap between the electrodes 31 and 5 and the surface of the dielectric 4, and ozone is generated. Further, the air sucked from the intake port 12 swirls the swirl passage 40 by the impeller 3 to reach the outlet port 13, penetrates the second electrode 5 located at the outlet port 13 and is blown from the air supply duct 14 to generate ozone. Are sent to the external destination space.

Further, both electrodes 31, 5 and the dielectric 4 are satisfactorily cooled by the high-speed air flow.

The following configuration can be adopted as a modification of this embodiment described above.

It suffices that the second electrode 5 can penetrate air, and the opening shape thereof can be variously selected, for example, it can be formed in a mesh shape.

The dielectric 4 may be provided in close contact with the surface of the first electrode 31,
Further, it may be provided on the second electrode side 5. For example, dielectric 4
The second electrode may be covered with. The shape of the dielectric body 4 can be changed as long as centrifugal air can be blown from the impeller 3, and the dielectric body 4 can be formed in a mesh shape, for example. Various ceramics may be used as the material of the dielectric 4.

EFFECTS OF THE INVENTION As described above, in the rotary ozonizer of the present invention, the second electrode is arranged at the outlet of the centrifugal blower at a predetermined discharge interval from the outer peripheral edge of the centrifugal blade. It is possible to secure a cross-sectional area of the swirl passage between the peripheral wall and the impeller, and prevent insufficient cooling of the dielectric and both electrodes due to obstruction of air flow. Further, the interval between both electrodes can be reduced, and the discharge voltage can be reduced without obstructing the air flow.

Therefore, it is possible to prevent the ozone generation efficiency from being lowered due to overheating of the dielectric material and the generation and deposition of harmful nitrates.
The durability of the dielectric can be significantly improved. Also,
By preventing overheating, the discharge current density can be increased and a compact and high-power ozonizer can be realized.

[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 an enlarged partial sectional view of the device shown in FIG. FIG. 3 is a plan view of the second electrode 5. 2 ... Motor 3 ... Impeller 31 ... Centrifugal blade (first electrode) 4 ... Dielectric 5 ... Second electrode 7 ... High-voltage power supply 10 ... Base cylinder part (case) 11 ... Lid (case)

Claims (1)

[Claims] 1. An impeller having a case having a cylindrical shape with a blowout opening tangentially extending from a part of a cylinder wall, and a centrifugal blade that rotates along the inner peripheral surface of the cylinder wall and also serves as a first electrode. An arc-shaped second electrode disposed with a predetermined gap from the outer peripheral edge of the impeller; a thin-walled dielectric material attached to one of the first and second electrodes; And a high voltage power supply for applying an AC silent discharge voltage between the second electrodes, wherein the second electrode is a perforated electrode disposed in the outlet.