JPH03215301A - Ozonizer - Google Patents

Abstract

PURPOSE:To enable stable and efficient generation of ozone by making a blower of a casing and rotating blades consisting of an electrode and equipping a linear fixed electrode at an equidistant position from the outer periphery of locus of rotation. CONSTITUTION:When blades 8 are rotated clockwise in the figure together with a basal plate by driving of a motor, the outer air is supplied into a casing 1a through an intake opening 9, introduced by the blades 8 to the gap between the inner periphery of the casing 1 and the periphery plane of the rotational locus of the end part of the blades 8 and subsequently discharged through a discharge opening 4. On the other hand, an alternating high voltage is applied to a fixed electrode 15 composed of a wire such as a stainless wire and to the blades 8 so that a silent discharge may be generated at an electrical discharge gap (G) between the fixed electrode 15 and the blades 8 facing thereto sandwiching a dielectric material 14 between them, thus generating the objective ozone.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ozone generator, and more particularly to an ozone generator in which a blower is constructed of a rotating electrode and a casing.

[Conventional technology] In general, an ozone generator has a solid insulator fixed to one of a pair of electrodes, and a high AC voltage is applied between the two electrodes to generate a partial discharge (silent discharge) in the gap between the two electrodes. Ozone is generated according to the following equation.

02 +6-+Q+Q+e () + O t + M→Os+M (M is the third object, and in the air it is mainly 02, N2
is the molecule of By the way, in such a device, it is necessary to quickly discharge the generated ozone from the gap between the two electrodes and to supply fresh air (oxygen) between the gap between the two electrodes. Therefore, in conventional devices, a blower, a pump, or the like is installed at a position before or after a pair of electrodes. Furthermore, in order to prevent the temperature of both electrodes and the temperature of the gap between the two electrodes from rising due to discharge, and the ozone generation efficiency from decreasing, it is essential to install a cooling device, especially in large-sized devices. Therefore, there is a problem in that the number of attached devices increases, making it difficult to make the entire device more compact and to simplify maintenance.

As a device to solve the above problem, Japanese Patent Application Laid-Open No. 1-17970
No. 2 proposes an ozone generator in which one electrode forms a blade, the other electrode forms a casing, and the blade and casing constitute a blower.

[Problems to be Solved by the Invention] However, in the case of a sirocco fan type blower in particular, in order to blow air smoothly and efficiently, the distance from the rotation center of the blade to the inner circumferential surface of the casing is increased toward the outlet. It needs to be formed so that Therefore, the above-mentioned Unexamined Patent Publication No. 1
When the blower casing is configured with one electrode as in the ozone generator described in Publication No. 179702,
There is a problem in that the amount of ozone generated is unstable because the distance of the discharge gap is not constant.

In order to keep the discharge gap constant, it is conceivable to arrange electrodes between the inner circumferential surface of the casing and the blades instead of forming the casing with electrodes. However, when ordinary plate-shaped electrodes are installed, they not only obstruct the flow of ventilation channels, but also cause local discharge due to the concentration of electric fields at sharp edges, making the amount of ozone generated unstable. There is a problem in that the life of the electrode becomes shorter as the electrode becomes shorter.

The present invention has been made in view of the above problems, and includes:
The purpose is to generate ozone efficiently and stably, and if the ozone generation ability is the same, the size can be reduced.
Moreover, it is an object of the present invention to provide an ozone generator in which the durability of the electrodes is improved.

[Means for Solving the Problem] In order to achieve the above object, in the present invention, a blower is constituted by a casing and a rotating blade housed in the casing and formed of an electrode, and the rotation of the rotating electrode is A linear fixed electrode is disposed between the outer circumferential surface of the locus and the inner surface of the casing at a position equidistant from the outer circumferential surface of the rotating locus, and a dielectric covering at least a portion of the rotating electrode facing the fixed electrode is integrated with the rotating electrode. It is rotatable.

[Function] In the ozone generator of the present invention, new air is automatically supplied to the discharge space (discharge gap) by the action of the blades as the rotating electrode rotates, and ozonized air is quickly removed and the discharge is completed. As a result of this action, the electrode, which has become hot, is cooled down. Since the fixed electrode arranged around the rotating electrode is linear, it does not adversely affect the flow in the ventilation passage. In addition, since there are no sharp parts such as edges, local discharge due to concentration of electric field does not occur, the amount of ozone generated is stabilized, and the life of the fixed electrode is extended.

Embodiment I] A first embodiment embodying the present invention will be described below with reference to FIGS. 1 to 4. This ozone generator has a basic form as a sirocco fan type blower.

As shown in FIGS. 1 and 2, the casing 1 is constructed by fastening and fixing a spiral-shaped casing body 1a and a cover 1b that covers the side surface of the casing body 1a with bolts 2 and nuts 3, and has a discharge port at one end. 4 is formed. A motor 5 is located approximately in the center of the outside of the cover 1b, and its drive shaft 5
a is loosely inserted and fixed into a through hole 6 formed in the cover 1b. A metal substrate 7 is rotatably fixed to the drive shaft 5a of the motor 5 through an insulating material at a boss portion 7a formed at the center thereof, and a metal (conductor) constituting a rotating electrode is fixed to the drive shaft 5a of the motor 5. A large number of blades 8 made of aluminum are protruded at predetermined intervals. A large number of suction ports 9 are formed at predetermined intervals on the cover ib at positions corresponding to the inside of the blades 8. Further, a metal terminal 10 is fitted and fixed to the boss portion 7a on the opposite side of the drive shaft 5a, and a contactor 11 that slides into contact with the terminal 10 is accommodated in the boss portion IC formed in the center of the casing body 1a. has been done. The contactor 11 is connected to the other end of a high-voltage electric wire l3 whose one end is connected to an AC high-voltage power supply 12 via a conductive material spring lla and screw llb, and is connected to each blade via the contactor 1l, the terminal 10 and the board 7. A high voltage is applied to 8. An endless strip-shaped dielectric material l4 made of silicone rubber is attached to the outer periphery of the blade 8 so that the rotating electrode side serves as a dielectric electrode. dielectric l
4 is formed to have a width of 20 to 30% of the width of the blade 8;
is placed in the center of the

The fixed electrode 15 is made of stainless steel wire and is curved into an arc with a radius of curvature slightly larger than the radius of the dielectric 14. The fixed electrode 15 is made of stainless steel wire and is curved into an arc shape with a radius of curvature slightly larger than the radius of the dielectric 14. They are arranged at equal distances.

In order to avoid electric field concentration on sharp parts of the fixed electrode 15,
As shown in Fig. 3, a pair of pillars l are bent outward so that both ends thereof are circular, and integrally protrude from the cover 1b.
6 is fixed to the tip with a screw 17 made of an insulator (resin). Note that the AC high voltage power supply 1 is connected to one of the pillars l6.
The other end of the high-voltage electric wire 18 is connected to the column 16 and the fixed electrode 15 with its terminal 18a being supported between the column 16 and the fixed electrode 15.

Next, the operation of the ozone generator configured as described above will be explained.

When the blades 8 are rotated together with the substrate 7 in the clockwise direction in FIG. 1 by the drive of the motor 5, external air is supplied into the casing l from the suction port 9, guided by the blades 8, and connected to the inner circumference of the casing main body 1a. After being guided between the tip of the blade 8 and the circumferential surface of the rotating locus, it is discharged from the discharge port 4. On the other hand, an AC high voltage is applied to the fixed electrode l5 and the blade 8 from an AC high voltage power supply l2. Then, a fixed electrode l is placed across the dielectric l4.
A silent discharge occurs between the discharge gap G between the fixed electrode 15 and the blade 8 facing the fixed electrode 15, and ozone 03 is generated.

Since the fixed electrode 15 is made of stainless steel wire, the fixed electrode 15 does not have a negative effect on the air flow inside the casing l.As the blade 8 rotates, fresh air flows into the discharge gap G. Air is supplied automatically and smoothly. Then, as the fixed electrode l5 and the blade 8 are cooled, the ozonized air is replaced with fresh air, so that a sufficient amount of oxygen to be ozonized is always present in the discharge gap G, and ozone is efficiently generated. Ru. In addition, since the discharge gap G is constant at any position of the fixed electrode l5, the amount of ozone generation is stabilized.Furthermore,
Since the fixed electrode 15 is made of a wire and has no sharp edges, the discharge location of the fixed electrode 15 is not concentrated in a specific part, which prevents early deterioration of the fixed electrode 15 and reduces the amount of ozone generated. is also stable. Further, since the dielectric body 14 is formed of an elastic material into an endless band shape, it can be easily attached to the outer periphery of the blade 8.

[Example 2] Next, a second embodiment will be described with reference to FIGS. 5 and 6.

This embodiment differs from the previous embodiment in the configuration of the dielectric 14, but the other configurations are the same. The dielectric 14 is formed in the shape of an endless strip, and as shown in FIG. 6, recesses 14a extending in the width direction (direction perpendicular to the plane of the paper) are formed at predetermined intervals on the back surface of the dielectric 14, and the tips of the blades 8 are inserted into the recesses 14a. It is attached to the outer periphery of the blade 8 in a fitted state. or,
As shown in FIG. 5, a through hole 19 extending in the width direction is formed between each recess 14a in the dielectric 14. As shown in FIG. The through hole 19 is formed to have a size that prevents spark discharge from occurring between the blade 8 and the fixed electrode 15 through the through hole 19. Note that the width of the dielectric 14 may be large enough to cover the entire blade 8 or may be large enough to partially cover the blade 8.

In the embodiment described above, the dielectric body 14 was formed in the shape of a simple endless band, so the effective area of the blades 8 was reduced, resulting in a decrease in air volume, and when the rotational speed of the blades 8 was increased, the dielectric body 14 was caused by centrifugal force or wind pressure. There is a risk that it may swell and interfere with the fixed electrode 15 or the casing l. However, in this embodiment, the air introduced into the inside of the dielectric 14 from the inlet 9 flows through the through hole 19.
Since the air is guided to the outside of the dielectric 14 through the air, a decrease in air volume is prevented. Further, the centrifugal force and wind pressure acting on the dielectric body 14 are reduced, and even if the blades 8 are rotated at high speed, there is no possibility that the dielectric body 14 will swell and interfere with the fixed electrode l5 or the casing l. Moreover, in the embodiment described above, there is a restriction on the width of the dielectric 14 in order to ensure the air volume, but in this embodiment, the width of the dielectric 140 is widened to the full width of the blade 8, and a large number of fixed electrodes 15 can be arranged. It becomes possible. In addition, since the dielectric body l4 is positioned by fitting each concave portion 14a into the tip of the blade 8, the portion covering the tip of the blade 8 shifts during rotation, and spark discharge occurs between it and the fixed electrode l5. Moreover, since the tip corner of the blade 8 is covered with the recess 14a, spark discharge between the tip corner of the blade 8 and the fixed electrode 15 through the through hole l9 is reliably prevented. .

[Embodiment 3] Next, an embodiment in which the distance between the fixed electrode 15 and the outer peripheral surface of the dielectric 14, that is, the discharge gap G, can be adjusted will be described with reference to FIGS. 7 and 8. The stainless steel wire constituting the fixed electrode 15 is curved into an arc shape, and support portions 15a extending outward parallel to each other are bent at both ends of the stainless steel wire.
Both support parts 15a are inserted into the insertion hole 20 formed in the book support l6.
is inserted. An insulating cap 21 made of rubber, resin, or the like is placed on the tip of both support portions 15a to prevent spark discharge from occurring from the tip of the wire end. A screw hole 22 perpendicular to the insertion hole 20 is formed in the upper part of the support column l6, and both the support parts 15a are tightened and fixed by screws 17 inserted into the screw hole 22. Furthermore, a high-voltage electric wire l8 is connected to one of the pillars 16 so as to be able to contact the lower part of the support portion 15a inserted through the insertion hole 20.
One end is inserted and fixed. Therefore, in this embodiment, the discharge gap G can be easily adjusted by moving the fixed electrode 15 to a predetermined position with the screw 17 loosened, and then tightening the screw 17 in that state.

Note that the present invention is not limited to the above embodiments,
For example, in order to increase the amount of ozone generated, the fixed electrode 15
A plurality of electrodes may be used, or the length of the fixed electrode 15 may be increased to cover the entire outer circumference of the blade 8. Further, the support 16 may be formed separately from the cover 1b and fixed with screws, or the dielectric 14 may be formed into a cap shape that covers the tip of each blade 8 instead of being formed into an endless band shape.

Furthermore, instead of using a sirocco fan type blower as the ozone generator, the ozone generator may be configured as an axial flow type blower and the shape of the blades may be changed accordingly.

[Effects of the Invention] As detailed above, according to the present invention, since the discharge gap is constant and the fixed electrode does not interfere with the air flow, ozone can be generated efficiently and stably. If the capacity is the same, the size can be reduced, and since the fixed electrode is made of wire and there are no sharp parts in the discharge part, local discharge due to concentration of electric field on the sharp part does not occur, improving the durability of the electrode. This improves the properties and stabilizes the amount of ozone generated.

[Brief explanation of drawings]

1 to 4 show a first embodiment embodying the present invention, in which FIG. 1 is a sectional view taken along line I-I in FIG. 2, FIG. 2 is a partially cutaway front view, and FIG. The figure is a front view of the fixed electrode, Figure 4 is a diagram showing the end of the high-voltage wire, Figures 5 and 6 are the second embodiment, and Figure 5 is the attachment of the dielectric to the rotating electrode. FIG. 6 is a plan view showing the state, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIGS.
The figure is a side view of a main part showing the attached state of the fixed electrode, and FIG. 8 is a view taken in the direction of arrow A in FIG. 7. Casing body 1a, discharge port 4, substrate 7 and blades 8 constituting a rotating electrode, suction port 9, dielectric 14, fixed electrode 15
, discharge gap G0

Claims (1)

[Claims] 1. A blower is constituted by a casing and a rotating blade housed in the casing and formed of an electrode, and a linear fixed electrode is placed between the outer circumferential surface of the rotating electrode and the inner surface of the casing. An ozone generator comprising: a dielectric body disposed equidistantly from an outer circumferential surface and covering at least a portion of the rotating electrode facing the fixed electrode; the dielectric body being rotatable integrally with the rotating electrode.