JP3644941B2 - Ion wind generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply device for generating indoor smoking or dust collecting ion wind.
[0002]
[Prior art]
As a curtain device for separating smoke into a smoking place and a non-smoking place, instead of a wind pressure type using a fan, as described in Patent Document 1, a curtain with an ionic wind is formed to shield the space. There is something.
[0003]
The power supply device for generating the ion wind includes a needle electrode, an attracting electrode, and a direct current power source. When a high DC voltage is applied between the two electrodes, dielectric breakdown occurs in the space around the electrodes, and corona discharge occurs. A large amount of electrons are emitted from the tip of the needle electrode, adhere to dust and gas molecules in the space, and ionize. The ionized dust and gas molecules flow toward the attracting electrode, are collected by the attracting electrode, and the charge disappears. However, if the speed of ions and electrons is high, they do not adhere to the attracting electrode and are released into the room. The electrons emitted into the room go straight by the electrons and ions that are pushed later while adhering to the dust and gas molecules in the room. In this way, an ionic wind in which only the substance moves without air movement is generated, and a curtain is formed.
[0004]
In the above power supply device, dust is attached to each electrode when used for a long time. Then, although current flows, the voltage drops, corona discharge hardly occurs, and the function of the curtain device deteriorates. Therefore, it is necessary to maintain each electrode periodically to keep the electrodes clean.
[0005]
In addition, due to the adhesion of dust, a leakage current flows along the surface of the insulating material that supports the electrode, and the surface insulating property of the insulating material may deteriorate. To prevent this, a constant current circuit is provided to limit the output current so that it does not flow more than the set value, and a cut-off circuit is provided to set the output voltage to 0 V when the output voltage falls within the limit current range. It is described in Patent Document 2.
[0006]
[Patent Document 1]
JP 2002-95998 A [Patent Document 2]
JP-A-10-286490 (paragraph 0007)
[0007]
[Problems to be solved by the invention]
As described above, in the curtain device using the ionic wind, if the electrode becomes dirty, it must be cleaned. Since the curtain device is usually installed on the ceiling or the upper part of the wall, the operation is very difficult. Therefore, it is desirable to reduce the number of cleanings. Further, if the cleaning is neglected, the output voltage is lowered, and eventually the cut-off circuit is operated, and the operation is stopped.
[0008]
As described above, when the situation that the curtain device has to be frequently stopped occurs, it becomes impossible to separate the smoke, and the indoor environment is deteriorated. Therefore, in view of the above, an object of the present invention is to provide a power supply device that can generate ion wind over a long period of time by reducing the number of times the operation of the curtain device using ion wind is stopped.
[0009]
[Means for Solving the Problems]
The problem-solving means according to the present invention is a power supply apparatus for generating an ion wind by corona discharge by applying a high-voltage DC voltage between a needle electrode and an attracting electrode, and detecting the contamination of the electrode and means, when the contamination of the electrode is detected, in which a control means for setting a voltage by raising the output voltage applied to the electrodes while maintaining the current within a predetermined range.
[0010]
When the electrodes are contaminated, the voltage applied to each electrode is lowered, so that corona discharge is less likely to occur and the generation of ion wind is not stable. Therefore, when the contamination of the electrode is detected, a constant high voltage is output while preventing overcurrent. Even if the electrodes are dirty, a high voltage sufficient to stably generate the ionic wind is applied to each electrode. As a result, the operation can be continued for a while without cleaning the electrodes, and the number of cleanings can be reduced.
[0011]
Detection of electrode contamination is performed by a detection circuit that detects an input voltage to a high voltage generation circuit for generating a high voltage. Due to the contamination of the electrodes, the output voltage of the high voltage generation circuit decreases, and the input voltage to the high voltage generation circuit decreases accordingly. Therefore, contamination of the electrode can be detected by detecting this input voltage.
[0012]
The output voltage is controlled by the control circuit for the high voltage generation circuit. The control circuit controls the high voltage generation circuit so that the output voltage is raised to the set voltage while maintaining the current within a certain range when a decrease in the input voltage due to electrode contamination is detected. That is, the amount of increase in the output voltage is calculated according to the amount of decrease in the input voltage, and the control signal is output to the high voltage generation circuit based on the calculated value to drive the high voltage generation circuit. Therefore, even if the output voltage decreases, the voltage is output immediately so as to become the set voltage, so that a predetermined high voltage can be applied to each electrode, and ion wind can be generated stably.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A curtain device using ionic wind according to the present invention is shown in FIGS. The curtain device includes an electrode unit 1 for generating ion wind and a cabinet 2 for housing the electrode unit 1.
[0014]
The cabinet 2 has a box shape that can be opened and closed, and an air inlet 3 is formed on the upper surface, and an outlet 4 is formed on the lower surface. The cabinet 2 is hung on a wall or embedded in a ceiling. In addition, when embedding in a ceiling, as shown in FIG. 3, the lower surface of the cabinet 2 is open | released, and the lid | cover 5 in which the discharge port 4 was formed is attached so that attachment or detachment is possible with a screw.
[0015]
As shown in FIGS. 4 to 6, the electrode unit 1 includes a needle electrode 6, an attracting electrode 7, an electrode case 8 on which the electrodes 6 and 7 are mounted, and a power supply device 9. The electrode case 8 is formed in a cylindrical shape whose upper and lower surfaces are opened by an electrically insulating synthetic resin. The support member 10 is attached via the L angle 11 along the side surface in the longitudinal direction of the electrode case 8, and both longitudinal ends of the support member 10 are attached to the fixing member 12 fixed to the cabinet 2 by screws 13. The electrode unit 1 can be attached to and detached from the cabinet 2, and a passage from the inlet 3 of the cabinet 2 through the electrode case 8 to the outlet 4 is formed.
[0016]
Further, the screw holes 14 formed at both ends of the support member 10 are formed in an arc shape, and the electrode case 8 can be attached while being inclined within the range of the screw holes 14. The support member 10, the fixing member 12, and the screw 13 constitute an angle variable mechanism that changes the angle of the electrode case 8 with respect to the cabinet 2. The electrode case 8 can be tilted around a fulcrum on the center line in the width direction. . By changing the mounting angle of the electrode case 8, the traveling direction of the ion wind can be set.
[0017]
As shown in FIG. 7, the needle electrodes 6 are integrally formed so as to protrude from one stainless steel plate holding portion 20, and a plurality of needle electrodes 6 are arranged at regular intervals in the longitudinal direction. The needle electrode 6 has a substantially triangular shape with a sharp tip, and as shown in FIG. 8, a step is formed on the tip side and is sharply narrowed. The thickness of the tip portion 21 is set to ½ or less of the thickness of the holding portion 20 on the root side. Thus, by thinning the tip 21 of the needle electrode 6, the electron generation location is limited to the tip and the corner of the step. Due to the Lorentz force generated by the magnetic field, electrons intensively emitted from the tip side are further focused. Therefore, the electrons emitted from the needle electrode 6 jump out straight without spreading and can improve the straightness of the ion wind. In addition, a large amount of electrons are emitted one after another, and the ions and electrons that have advanced are pushed out, and the distance that the ion wind reaches can be increased. The effective range of the curtain reaches a position far away from the electrode unit 1, and the effective range becomes wide, and the shielding power of the curtain can be increased. The tip end side of the needle electrode 6 is thinned by pressing, but may be thinned by a method such as etching or grinding.
[0018]
As shown in FIG. 6, the needle electrode 6 is positioned on the center line in the width direction of the electrode case 8. The holding portion 20 is attached to the side surface of the electrode case 8 with a screw 22, and the needle electrode 6 can be attached to and detached from the electrode case 8. The screw 22 is covered with an electrically insulating synthetic resin spacer 23, and the end of the screw 22 protruding from the electrode case 8 is covered with an electrically insulating synthetic resin cap 24. The cap 24 is sealed with an insulating resin and attached to the electrode case 8.
[0019]
The attracting electrode 7 is made of a flat plate made of stainless steel, and both upper and lower ends are folded outward. The surface of the attracting electrode 7 is coated with a conductive and non-adhesive coating material. This coating is a conductive fluororesin coating, and a cobalt or nickel fine particle contains a fluororesin such as PTFE (tetrafluoroethylene resin), PFA (tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin), or the like. It is obtained by electroless plating of the attracting electrode 7 using a coating material. Note that an antifouling silicone resin may be used in place of the fluororesin, and coating may be performed by mixing conductive fine particles therein. Moreover, you may coat the photocatalyst which has electroconductivity, such as a titanium oxide.
[0020]
If such a coating is used, the antifouling property can be enhanced without interfering with corona discharge since it is conductive. Therefore, dirt such as dust is hardly attached to the surface of the attracting electrode 7, the number of cleanings can be reduced, and continuous operation over a long period of time is possible.
[0021]
The two attracting electrodes 7 are arranged in parallel to face the lower part of the electrode case 8 near the discharge port. An insulating plate 25 is interposed between the attracting electrode 7 and the electrode case 8. The insulating plate 25 is affixed to the inner surface of the electrode case 8, and the upper and lower folded portions of the attracting electrode 7 are in contact with the insulating plate 25. In this way, by not bringing the attracting electrode 7 into direct contact with the electrode case 8, complete electrical insulation between the needle electrode 6 and the attracting electrode 7 is achieved, and no creeping discharge occurs even if dust adheres to the electrode case 8. I am doing so.
[0022]
A stud bolt 26 is fixed to the outer surface of the attracting electrode 7. The front end of the stud bolt 26 penetrates the side surface in the longitudinal direction of the electrode case 8 and protrudes outward. By fitting the nut 27 to the stud bolt 26, the attracting electrode 7 is detachably attached to the electrode case 8. The tip of the stud bolt 26 and the nut 27 are covered with an electrically insulating synthetic resin cap 24, and the cap 24 is sealed with an insulating resin and attached to the electrode case 8.
[0023]
U-shaped support fittings 28 are provided at both ends of the two attracting electrodes 7 in the longitudinal direction so as to contact both electrodes 7. The support fitting 28 is screwed to the electrode case 8 and electrically connects the two attracting electrodes 7 facing each other.
[0024]
As shown in FIG. 9, the power supply device 9 includes a high voltage generation circuit 30 having a high voltage transformer for generating a high voltage, a switching circuit 31 that supplies an input voltage to the high voltage generation circuit 30, and an AC voltage as a direct current. A rectifier circuit 32 that converts the voltage to be supplied to the switching circuit 31, a control circuit 33 that controls the switching circuit 31 so that the output voltage from the high voltage generation circuit 30 is constant, and an abnormal state during operation. An abnormality detection circuit 34 for detecting this and an auxiliary power supply circuit 35 for supplying a drive voltage to the control circuit 33 are provided.
[0025]
These circuits are mounted on a substrate 36 and screwed to the side surface of the electrode case 8 via an electrically insulating synthetic resin spacer 37 as shown in FIG. The + side output terminal of the high voltage generating circuit 30 is connected to the stud bolt 26 of the attracting electrode 7 by a high voltage cable, and the − side output terminal is connected to the screw 22 for attaching the needle electrode 6 by the high voltage cable. . A negative high voltage is applied to the needle electrode 6 and a positive high voltage is applied to the attracting electrode 7.
[0026]
In the power supply device 9 described above, the rectifier circuit 32 rectifies a 100V AC voltage to generate a DC voltage of about 140V. The auxiliary power supply circuit 35 generates a voltage of several tens of volts from this DC voltage and supplies it to the control circuit 33. Based on the control signal from the control circuit 33, the switching circuit 31 generates a voltage within a predetermined range, for example, about 55 to 80 V from the input DC voltage. The control circuit 33 monitors the output voltage of the switching circuit 31 so as to obtain an output set by operating the external volume, and outputs a control signal to the switching circuit 31 so that the set voltage is obtained. In addition, the control circuit 33 outputs a control signal to the high voltage generation circuit 30 so that the ratio of the input to the output of the high voltage generation circuit 30 is constant, for example, 1: 2. The high voltage generation circuit 30 drives the high voltage transformer by a separate excitation method, and drives the high voltage transformer by changing the on / off time timing of the switching element based on the control signal, so that the input voltage is predetermined. The voltage is boosted to a voltage of and rectified to output a positive and negative high voltage, for example, a high voltage of about ± 8.5 kV to ± 11 kV.
[0027]
The abnormality detection circuit 34 detects the input voltage to the high voltage generation circuit 30 output from the switching circuit 31, and outputs a detection signal to the control circuit 33 when the input voltage drops to a predetermined value. Thereby, it is possible to detect a decrease in input voltage that occurs when dust adheres to the electrodes 6 and 7. That is, the abnormality detection circuit 34 functions as detection means for detecting dirt on the electrodes 6 and 7.
[0028]
When a high voltage is applied between the needle electrode 6 and the attracting electrode 7 and the operation for generating the ion wind is continued, dust adheres to each of the electrodes 6 and 7, particularly the attracting electrode 7. Then, the output voltage from the high voltage generation circuit 30 decreases, and accordingly, the voltage on the primary side of the high voltage generation circuit 30 also gradually decreases. When the high voltage applied to each of the electrodes 6 and 7 is reduced, corona discharge is less likely to occur and the amount of electrons emitted is reduced. Therefore, the ion wind becomes unstable and the function of the curtain device is lowered.
[0029]
Therefore, the abnormality detection circuit 34 detects this voltage drop, and outputs a detection signal to the control circuit 33 when detecting that the input voltage supplied to the high voltage generation circuit 30 has dropped to a predetermined value. In order to obtain the set output voltage, the control circuit 33 outputs a control signal to the high voltage generation circuit 30 so as to lengthen the on-time of the switching element in accordance with the amount of decrease in the input voltage. A control signal is output so that the output current of the generation circuit 30 falls within a certain range. The high voltage generation circuit 30 is driven according to this control signal. Then, the voltage output from the high voltage generation circuit 30 rises, and the set high voltage is applied to each of the electrodes 6 and 7, so that the amount of emitted electrons increases and the ion wind is stabilized and set. The effective range of the generated ion wind can be maintained. Further, since the output current is controlled within a certain range so that no overcurrent flows, the leakage current flowing through each insulating member in the electrode case 8 to which dust adheres can be suppressed, and the surface insulating property of the insulating member can be suppressed. Deterioration can be prevented.
[0030]
A plurality of predetermined values may be set within a range of about 55 to 80V. Since the high voltage generating circuit 30 can be finely controlled, there is no variation in the generation of ion wind, and stable operation can always be performed. Alternatively, the output voltage may be continuously controlled by always detecting the input voltage.
[0031]
When it is detected that the input voltage is lower than the lower limit, for example, 40 V or lower, the control circuit 33 stops the operation by the detection signal from the abnormality detection circuit 34. That is, when a large amount of dust accumulates on the needle electrode 6 and the attracting electrode 7, a current flows but a voltage drops greatly. In this case, the electrode unit 1 needs to be cleaned. Therefore, the operation is forcibly stopped to promote cleaning.
[0032]
By controlling the high voltage generation circuit 30 as described above, it is possible to apply a high voltage even if dust adheres to the electrodes 6 and 7, so that ion wind can be generated stably. it can. Therefore, it becomes possible to continue the operation of the curtain device over a long period of time, the number of cleanings can be reduced, and the period during which the curtain device is stopped for maintenance can be shortened.
[0033]
In addition, a limit switch is connected to the abnormality detection circuit 34, and the limit switch is turned on when the cabinet 2 is opened or the lid 5 is removed. The abnormality detection circuit 34 outputs a stop signal to the control circuit 33 when an ON signal is input from the limit switch. Then, the control circuit 33 stops the operation of the high voltage generation circuit 30 and interlocks it so that the output voltage of the high voltage generation circuit 30 becomes 0V. Here, when the abnormal state is resolved and the reset switch is turned on, the control circuit 33 releases the interlock.
[0034]
Next, a smoke separation system using the curtain device will be described. In the smoke separation system, a curtain is formed by ion wind, and the space is shielded to prevent invasion and diffusion of floating substances, thereby forming a clean space. The suspended substances are dust, smoke, oil mist, suspended bacteria, odors, harmful substances (formaldehyde, VOC, etc.), ammonia, humid and warm air, cold, small pests such as mosquitoes and flies.
[0035]
First, as a function of the curtain device, as shown in FIG. 10, the shielded space can be made a clean space by blocking the intrusion path with respect to the suspended matter entering from one direction by the ion wind curtain. it can. In this case, it is preferable to adjust the angle of the electrode unit 1 and set the direction of the curtain so as to face the invading suspended matter. As a result, it is possible to prevent particles and molecules that settle upon receiving electric charges from spreading into the shielded space. Once suspended, suspended matter will not rise again. In the figure, A is a curtain device.
[0036]
Further, as shown in FIG. 11, if the push-pull method using the curtain device A and the suction fan 40 is used, the shielding effect against intrusion from the outside can be further enhanced. That is, the suction fan 40 is installed facing the curtain device A, and a curtain is formed between them. As a result, a synergistic effect between the curtain by the ionic wind and the curtain by the wind pressure is obtained, and the shielding force of the curtain that overcomes the moving speed of the suspended matter is generated. Therefore, even if the moving speed of the suspended matter is high, the curtain cannot be broken through and the suspended matter can be prevented from entering.
[0037]
As another function, as shown in FIG. 12, the diffusion path of floating substances can be shielded by a curtain. If the direction of the curtain is set to a direction toward the floating substance to be diffused, the floating substance is blocked by the curtain and stopped. As a result, it is possible to prevent diffusion of floating substances in the shielded space.
[0038]
As another function, as shown in FIG. 13, the diffusion direction of the floating substance can be regulated by a curtain and guided in an arbitrary direction. As a result, the floating substance can be discharged from the shielded space without spreading around. In this case, it is efficient to use the three curtain devices A, B, and C together. That is, the front and rear of the floating substance are shielded by the curtains by the two front and rear curtain devices B and C, and the floating substance is guided by the curtain by the middle curtain device A. The curtain in the middle is formed toward the exhaust device 41 and guides suspended matter to the exhaust device 41. The front curtain is formed above the exhaust device 41 and suppresses the floating material that overflows and effectively guides it to the exhaust device 41. The rear curtain shields the rear of the suspended matter and prevents excess air from flowing in from behind as the suspended matter is aspirated.
[0039]
The smoke separation system is configured by combining the curtain device A and other air purifying devices and installing them in a room. Air cleaning equipment is placed in the space shielded by the curtains with ionic wind to clean the inside of the shielded space or prevent floating substances from coming out of the shielded space. Keep the space clean. Examples of the air purifier include a ventilator, a smoke separator, a smoke decomposer, an air purifier, an air conditioner with a purifying function or a ventilating function. An example of this system is shown below.
[0040]
In FIG. 14, the ventilation fan 42 is combined. The curtain by the ion wind from the curtain device A installed on the ceiling prevents floating substances such as the gas phase component and the particle phase component of the smoke from diffusing into the room from the shielded space, and exhausts the air outside by the ventilation fan 42. At this time, if oxygen is supplied to this space with fresh air, the concentration of carbon monoxide and carbon dioxide does not increase, and environmental deterioration in the space can be prevented. The gas phase components are ammonia, formaldehyde, acetaldehyde, nitrogen oxides, carbon monoxide, carbon dioxide and the like. The particle phase component is dust, oil mist, airborne bacteria, and the like.
[0041]
In FIG. 15, a ventilation device 43 such as a duct and a smoke separator 44 are combined. Two or more curtain devices A are installed on the ceiling to form a space closed by a curtain made of ion wind. A smoke separator 44 is installed in this space, and a ventilation device 43 is installed on the ceiling. The particulate phase component is removed by the smoke separator 44, and the gas phase component is discharged to the outside by the ventilation device 43. Furthermore, if oxygen is supplied to this space with fresh air, the concentration of carbon monoxide and carbon dioxide can be prevented from increasing, and a clean environment in the space can be maintained.
[0042]
In FIG. 16, the smoke separator 44 and the smoke decomposer 45 are combined. Two or more curtain devices A are installed on the ceiling to form a space closed by a curtain made of ion wind. In this space, a smoke separator 44 is installed, and a smoke decomposer 45 is installed on the ceiling. The particle phase component is removed by the smoke separator 44, and the gas phase component is oxidatively decomposed by the smoke decomposer 45. As a result, a clean space can be obtained without polluting the outside air. Furthermore, if oxygen is supplied to this space with fresh air, the concentration of carbon monoxide and carbon dioxide can be prevented from increasing, and a clean environment in the space can be maintained.
[0043]
The following is an example of introducing the above smoke distribution system. Smoking corners can be set up by enclosing a room with curtains. A smoke separator or smoke decomposer may be disposed here. In offices and restaurants, it can be divided into non-smoking seats and smoking seats by curtains. If a curtain is formed between the kitchen / counter and the auditorium in the cafeteria / restaurant, the smoke, odor, etc. from cooking will not spread to the auditorium and will not cause any uncomfortable feeling to the customer. It does not enter kitchens and kitchens and is hygienic. If a curtain is formed at the entrance of the toilet, odor can be prevented from leaking out of the toilet. By enclosing a smoker with a curtain in a vehicle such as an automobile, the passenger is not disturbed.
[0044]
In addition, this invention is not limited to the said embodiment, Of course, many corrections and changes can be added to the said embodiment within the scope of the present invention. The contamination of the electrode may be detected by detecting the reflected light of the electrode using an optical sensor as the detection means.
[0045]
The power supply device may be used not only for the curtain device but also for an air purifier that collects electricity by applying a high voltage to the dust collection electrode.
[0046]
【The invention's effect】
As is apparent from the above description, according to the present invention, when the electrode becomes dirty during operation, the output voltage is controlled to increase, so that the ion wind can be generated stably. As a result, even if the electrodes are dirty, the operation can be continued, the continuous operation can be performed for a long period of time, the reach of the ion wind can be increased, and the shielding power of the curtain can be maintained for a long period. Therefore, when the electrodes are contaminated as in the prior art, it is not necessary to turn off the power supply for cleaning each time, the number of cleanings is reduced, and maintenance work can be reduced. If this power supply device is used in a curtain device, stable curtain shielding performance can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a curtain device according to an embodiment of the present invention. FIG. 2 is a bottom view of a cabinet of the curtain device. FIG. 3 is a perspective view of another type of cabinet. Figure [Figure 5] Figure showing the mounting structure of the electrode unit to the cabinet [Figure 6] Cross section of the electrode unit [Figure 7] Figure showing the needle electrode [Figure 8] Enlarged view of the tip of the needle electrode [Figure 9] Circuit block diagram of power supply device [FIG. 10] Functional explanatory diagram of curtain device [FIG. 11] A diagram showing an example of use of curtain device [FIG. 12] Functional explanatory diagram of curtain device [FIG. 13] Functional explanatory diagram of curtain device [FIG. 14] A diagram showing an embodiment of the smoke separation system. [Fig. 15] A diagram showing an embodiment of the smoke separation system. [Fig. 16] A diagram showing an embodiment of the smoke separation system.
DESCRIPTION OF SYMBOLS 1 Electrode unit 2 Cabinet 6 Needle electrode 7 Attracting electrode 8 Electrode case 9 Power supply device 30 High voltage generation circuit 31 Switching circuit 33 Control circuit 34 Abnormality detection circuit 40 Suction fan 41 Exhaust device 42 Ventilation fan 43 Ventilation device 44 Smoke machine 45 Smoke decomposition Machine A Curtain device

Claims (2)

A power supply device for generating an ion wind by corona discharge by applying a high-voltage DC voltage between a needle electrode and an attracting electrode, and detecting means for detecting dirt on the electrode, and dirt on the electrode when detected, the ion wind generation power source device being characterized in that a control means for setting a voltage by raising the output voltage applied to the electrodes while maintaining the current within a predetermined range. A power supply device for generating an ion wind by corona discharge by applying a high-voltage DC voltage between a needle electrode and an attracting electrode, a high voltage generation circuit for generating a high voltage, and the high voltage A switching circuit for supplying an input voltage to the generation circuit, a control circuit for controlling the switching circuit so that an output voltage from the high voltage generation circuit is constant, and the high voltage generation for detecting contamination of the electrodes. A detection circuit that detects an input voltage to the circuit, and when the control circuit detects a decrease in the input voltage due to contamination of the electrodes, the control circuit increases the output voltage while keeping the current within a certain range. The high-voltage generating circuit is controlled so as to become an ion wind generating power supply device.

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