JP2004127858A - Static eliminator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a static eliminator capable of accurately detecting a failure of eliminating static electricity even if an ambient atmospheric pressure fluctuates. <P>SOLUTION: The ambient atmospheric pressure of a common discharge electrode 10 is changed under a normal condition in advance, and the load voltage level of a current measuring resistance 28 is measured for every ambient atmospheric pressure. The load voltage levels (optimum level) is each memorized in a memory by making it correspond to the output level of a pressure sensor 16 at the time when the sensor is subjected to the ambient atmospheric pressure corresponds to it. A control circuit 20 takes in the output level from the pressure sensor 16 and the load voltage level of the current measuring resistance 28 one by one, reads out the optimum level corresponding to the output level from the pressure sensor 16, computes two reference levels shifted upward and downward from the optimum level, and determines if the static eliminator fails to eliminate static electricity by finding whether the load voltage level of the current measuring resistance 28 is within a range between both reference levels. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
[0002]
The present invention relates to a static eliminator that generates positive and negative air ions by applying a voltage to a discharge electrode to cause corona discharge.
[0003]
[Prior art]
The static eliminator generates, for example, positive and negative air ions alternately by applying a constant amplitude AC high voltage between a discharge electrode and a ground electrode arranged in an ion generation chamber and performing corona discharge. The ion is sprayed on the charged body to neutralize the charged body.
In this type of static eliminator, the amount of ions generated from the discharge electrode decreases due to, for example, dust in the surrounding air adhering to the discharge electrode or the tip of the discharge electrode being worn by long-term use. As a result, an abnormal state (defective static elimination) where a sufficient static elimination effect cannot be obtained may occur. Therefore, conventionally, a resistance for current measurement is connected between the ground electrode and the ground line, and the load voltage level of the resistance is set to a predetermined reference level (for example, when there is no adhesion of dust, etc., and when the tip is not worn). (Slightly higher than the load voltage level of the above-described resistor) to detect a static elimination failure lower than the reference ion generation amount (see Patent Document 1).
[0004]
[Patent Document 1]
JP 2001-85191 A
[Problems to be solved by the invention]
Incidentally, the amount of generated ions changes depending on the surrounding environment such as the ambient pressure and the ambient temperature. In other words, the amount of ion generation is reduced not only due to the above-described defective static elimination but also due to changes in the surrounding environment. Therefore, in the above-described conventional configuration in which the detection operation is performed at a uniform reference level regardless of the surrounding environment, even if no static elimination failure occurs, the ion generation amount becomes lower than the reference level due to a change in the surrounding environment and the static elimination failure occurs. There is a problem that an erroneous determination is made.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a static eliminator capable of accurately detecting a static elimination failure even when ambient pressure or the like changes.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the static eliminator according to the first aspect of the present invention is a static eliminator that generates positive and negative air ions by applying a voltage to a discharge electrode by a voltage power source to generate a corona discharge in the discharge electrode. Atmospheric pressure measuring means for measuring the atmospheric pressure around the discharge electrode, ion generating amount measuring means for measuring the amount of ions generated by corona discharge, measuring ion generating amount measured by the ion generating amount measuring means, and pressure measuring It is characterized in that there is provided a static elimination failure detecting means for detecting a static elimination failure based on the reference ion generation amount corresponding to the measured atmospheric pressure measured by the means.
[0007]
According to a second aspect of the present invention, the static eliminator according to the first aspect further includes a storage unit that stores a reference level corresponding to a reference ion generation amount according to a change in ambient pressure in advance in association with each ambient pressure. The static elimination failure detecting means reads a reference level corresponding to the measured atmospheric pressure measured by the atmospheric pressure measuring means from the storage means, and reads the read reference level and the measured ion generation amount measured by the ion generation amount measuring means. Are characterized by performing a detection operation according to the comparison result.
[0008]
According to a third aspect of the present invention, there is provided the static elimination apparatus according to the first aspect, further comprising: an ambient atmosphere measuring unit that measures at least one of an ambient temperature and an ambient humidity of the discharge electrode; It is characterized in that in addition to the measured ion generation amount and the atmospheric pressure measured by the atmospheric pressure measuring means, a static elimination failure is detected based on the measurement result by the surrounding atmosphere measuring means.
[0009]
According to a fourth aspect of the present invention, in the static eliminator according to the third aspect, a reference level corresponding to a reference ion generation amount according to a change in a measurement result by the ambient pressure and ambient atmosphere measuring means is set in advance to each ambient pressure and ambient atmosphere measuring means. Storage means which is stored in association with each combination of the measurement results according to the above. The static elimination failure detection means includes a reference level corresponding to the measurement pressure measured by the pressure measurement means and the measurement result measured by the ambient atmosphere measurement means. Is read from the storage unit, the read reference level is compared with the measured ion generation amount measured by the ion generation amount measurement unit, and a detection operation is performed according to the comparison result.
[0010]
Function and effect of the present invention
<Claims 1 and 2>
In the configuration of the present invention, the ambient pressure of the discharge electrode and the amount of ions generated by corona discharge are measured, and the measured ion generation amount and the reference ion generation amount (dust, etc.) associated with the measured pressure are measured. (The amount of ions generated when no adhesion or wear of the tip has occurred). That is, the measured ion generation amount is compared with a reference level corresponding to the reference ion generation amount under the ambient atmospheric pressure at that time, and an operation for detecting a static elimination failure is performed based on the comparison result. Therefore, it is possible to accurately detect a static elimination failure without erroneously determining that the ion elimination amount is a failure due to a change in the surrounding environment, even though no static elimination failure has occurred, due to a change in the surrounding environment. Can be. Then, when the static elimination failure is detected by the static elimination failure detecting means, for example, a configuration for notifying the static elimination failure to the outside such as sounding a warning sound or turning on a light emitting means, a configuration for stopping the static elimination device itself, and the like. By using this, it is possible to avoid a problem that the device is continuously used under poor static elimination in which a sufficient static elimination effect cannot be obtained.
[0011]
<Inventions of Claims 3 and 4>
The ion generation amount may fluctuate not only due to a change in the ambient pressure of the discharge electrode but also to a change in the ambient temperature or the ambient humidity. Therefore, according to the configuration of the present invention, at least one of the ambient temperature and the ambient humidity (that is, “only the ambient temperature”, “only the ambient humidity”, or “both the ambient temperature and the ambient humidity”) is also measured. It is configured to detect a static elimination failure based on the measurement result and the measured atmospheric pressure and the measured ion generation amount. Therefore, even if the ambient temperature or the ambient humidity changes as well as the ambient atmospheric pressure, it is possible to accurately detect a static elimination failure.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
A first embodiment of the present invention will be described with reference to FIGS.
The static eliminator according to the present embodiment includes, for example, one discharge electrode (hereinafter, “common discharge electrode 10”) to which positive and negative DC high voltages are alternately applied, and a ground electrode 11. It is an AC voltage application type. Then, by emitting air from the air supply unit 13 into the ion generation chamber 12, ions generated in the ion generation chamber 12 by corona discharge at the common discharge electrode 10 are converted into an air outlet 12 a in front of the ion generation chamber 12. From the outside.
[0013]
FIG. 2 shows a specific configuration of the present embodiment. Among the columnar ion generation chambers 12 whose one end side is open to the outside, an air discharge port 12a having the same diameter as the ion generation chamber 12 is formed at one end side, while the other end side is formed by the air supply means 14. The air supply section 13 communicates with the air supply path 15 of the air supply section. The pipe of the air supply unit 13 is formed such that the tip side is tapered, and the inside diameter of the tip opening 13 a is smaller than that of the ion generation chamber 12. The ground electrode 11 has an annular shape and is embedded in the inner wall surface of the ion generation chamber 12 so as to surround the common discharge electrode 10. The common discharge electrode 10 is disposed in the opening 13 a of the air supply unit 13. The needle tip 10a is provided so as to be located near the air discharge port 12a of the ion generation chamber 12.
In the present embodiment, a pressure sensor 16 is provided on the inner wall of the ion generation chamber 12 at a position close to the tip 10 a of the common discharge electrode 10.
[0014]
Next, the circuit configuration of the present embodiment will be described with reference to FIG. This embodiment can reduce the size and cost of the device by adopting a circuit configuration in which a single high-voltage generating circuit 17 can apply positive and negative voltages to the common discharge electrode 10 as described below. It has become.
[0015]
The high-voltage generating circuit 17 is connected between one end of a secondary winding of the step-up transformer 18 and an output terminal 17c, with the step-up transformer 18 having a primary winding connected to the input terminals 17a and 17b, and connected to the ground line GND. And a Cockcroft-type voltage doubler rectifier circuit 19 that generates a positive DC voltage with respect to the output voltage V1 (V) from the output terminal 17c. The other end of the secondary winding of the step-up transformer 18 is connected to the output terminal 17d.
The input terminal 17a of the high voltage generation circuit 17 is connected to a switch 21 that is opened and closed by the control circuit 20. The switch 21 is connected to an AC voltage power supply 22, while the output terminal 17c is connected to a capacitor 23. The common discharge electrode 10 is connected to the capacitor 23 in series. Further, a resistor 24 is connected between the input terminal 17b and the output terminal 17d. Of these, the input terminal 17b is connected to the ground line GND, and a resistor 25 is connected between the output terminals 17c and 17d. I have. Also, a resistor 26 is connected between the common connection point between the capacitor 23 and the common discharge electrode 10 and the output terminal 17d.
[0016]
The control circuit 20 causes the voltage doubler generation circuit 12 to output a DC pulse voltage having a pulse width T and a pulse interval 2T, which is sufficiently longer than the cycle of the AC voltage power supply 22 (specifically, the AC voltage power supply 22). The switch 21 is opened / closed at a cycle of twice or more of the cycle of FIG.
The circuit constants of the capacitor 23, the common discharge electrode 10 and the resistor 26 constituting the CR differentiating circuit 27 are such that when the pulse voltage from the high voltage generating circuit 17 is applied to the CR differentiating circuit 27, the capacitor 23 is charged. When the time required for the voltage to reach V1 (V) is longer than the pulse width T and the DC pulse voltage is continuously applied, the charging voltage of the capacitor 23 is set to V1 / 2 (V). Is set.
[0017]
The ground electrode 11 is grounded via a current measuring resistor 28. A current according to the amount of ions generated at the common discharge electrode 10 flows through the current measuring resistor 28. By measuring this load voltage level, the respective amounts of ions generated during positive ion generation and negative ion generation can be determined. It becomes possible to measure. Therefore, the control circuit 20 takes in the load voltage level of the current measuring resistor 28 and also takes in the output signal of the pressure sensor 16.
[0018]
Next, the operation of the above configuration will be described.
An AC voltage from an AC voltage power supply 22 is intermittently supplied to a high voltage generating circuit 17 by a switch 21 that opens and closes at a predetermined cycle, and a pulse width T and a pulse width T as shown in FIG. A DC pulse voltage at an interval of 2T is output, and this voltage is applied to the capacitor 23 and the common discharge electrode 10.
[0019]
Here, since the common discharge electrode 10 can be regarded as a resistance element, the differentiating circuit 9 including the capacitor 23, the common discharge electrode 10 and the resistor 26 is connected to the output terminal 17c of the high voltage generation circuit 17. Is equivalent. Therefore, when a DC pulse voltage is applied to the CR differentiating circuit 27, the voltage applied to the common discharge electrode 10 has a waveform as shown in FIG. 4B, and the charging voltage of the capacitor 23 is as shown in FIG. Waveform.
[0020]
Specifically, in the rising section (1) of the DC pulse voltage of the high voltage generation circuit 17, a positive voltage having the same voltage value as the DC pulse voltage value V1 (V) is applied to the common discharge electrode 10. At the same time, the charging voltage of the capacitor 23 starts to increase, and in the section (2) where the voltage value is constant, the charging voltage of the capacitor 23 continues to increase, so that the applied voltage of the common discharge electrode 10 becomes zero level with a predetermined slope. Get closer. Here, since the time constant of the CR differentiating circuit 27 is sufficiently larger than the pulse width of the DC pulse voltage, the capacitor 23 is hardly charged, and the charged voltage is the DC pulse voltage value 2 * V1 (V ).
Since the common discharge electrode 10 has a very high resistance value (generally in the order of gigaohms), it is very difficult to discharge the capacitor 23 using only the common discharge electrode 10. On the other hand, in the present embodiment, by connecting the resistor 26 in parallel with the common discharge electrode 10, the resistance value of the resistance component of the CR differentiating circuit 27 is reduced, and the discharge of the capacitor 23 is promoted.
[0021]
Then, in the section (3) where the DC pulse voltage falls, the capacitor 23 is discharged, so that its charging voltage starts to decrease and a negative voltage is applied to the common discharge electrode 10. In the section (4) in which the DC pulse voltage is not output, the charge stored in the capacitor 23 is discharged to reduce the charging voltage, and the voltage applied to the common discharge electrode 10 becomes zero level with a predetermined slope. Get closer. In addition, the capacitor 23 is charged at a predetermined voltage without being completely discharged.
In the section of (3) of the output pulse voltage, the electric charge stored in the capacitor constituting the voltage doubler rectifier circuit 19 is discharged via the resistor 25. Falls faster.
As described above, since the capacitor 23 is not completely discharged in the section of {circle around (4)}, when the above operation is repeated, the charging voltage of the capacitor 23 gradually increases, and the voltage becomes V1 (V). And the peak value of the positive voltage among the voltages applied to the common discharge electrode 10 gradually decreases, so that the positive and negative voltages become the same.
[0022]
In such a state, when a DC pulse voltage is applied, the common discharge electrode 10 is applied to the common discharge electrode 10 with a voltage V1 (difference between the DC pulse voltage value 2 * V1 (V) and the capacitor charging voltage V1 (V). When V) is applied and no pulse voltage is applied, a voltage of -V1 (V) is applied. As a result, an AC voltage having an amplitude corresponding to the discharge start voltage is applied to the common discharge electrode 10, and the same amount of positive and negative ions is generated alternately.
Note that a current corresponding to an ion current (a current flowing between the common discharge electrode 10 and the ground line GND) flows through the resistor 24, and by measuring the applied voltage, the ion current can be detected. The control circuit 20 may measure the ion generation amount based on the load voltage level of the resistor 24 instead of the current measuring resistor 28.
[0023]
Here, as shown in FIG. 1, the amount of generated ions is, for example, an abnormal state (dust removal failure) in which dust or the like in ambient air adheres to the common discharge electrode 10 or the tip of the discharge electrode is worn by long-term use. Not only when it becomes, but also due to changes in the ambient pressure. This change depends on the shape of the common discharge electrode 10, the distance from the ground electrode 11, and the like. Thus, in the present embodiment, the ambient pressure around the common discharge electrode 10 is changed while driving the static eliminator in a state in which dust and the like do not adhere to the common discharge electrode 10 or wear at the tip (normal state). The load voltage level of the current measurement resistor 28 is measured for each ambient pressure, and each load voltage level (hereinafter, “optimum level”) is associated with the corresponding output level from the pressure sensor 16 at the ambient pressure. And stored in a memory (not shown).
[0024]
When the static eliminator is activated, the control circuit 20 functions as the “static deficiency detection unit” of the present invention. Specifically, for example, the control circuit 20 sequentially takes in the output level from the pressure sensor 16 and the load voltage level of the current measuring resistor 28 in synchronization with the opening / closing operation of the switch 21. Then, the above-mentioned optimum level corresponding to the output level from the pressure sensor 16 is read, and two reference levels shifted up and down by a predetermined value from the optimum level are calculated, and the load voltage level of the current measuring resistor 28 becomes If it is within the range between the two reference levels, it is regarded as normal. If it is outside the range between the two reference levels, the output circuit 29 is controlled to output the detection signal as the above-mentioned charge elimination failure. Therefore, in this embodiment, the level range sandwiched between the two reference levels corresponds to the “reference level” of the present invention.
[0025]
Now, for example, when the amount of air supplied from the air supply unit 13 is changed to change the amount of air ions emitted from the ion generation chamber 12, the ambient pressure of the common discharge electrode 10 changes accordingly. However, as in the above-described configuration, a configuration in which the load voltage of the measured current measurement resistor 28 is compared with a reference level corresponding to the reference ion generation amount under ambient atmospheric pressure at that time to detect a charge removal failure is provided. Accordingly, it is possible to avoid erroneous determination that there is a static elimination failure due to a change in ambient pressure even if no static elimination failure occurs, and it is possible to accurately detect the static elimination failure. Then, based on the detection signal from the output circuit 29, it is sufficient to use a configuration for notifying the failure of static elimination to the outside, such as sounding a warning sound or turning on a light emitting unit, or a configuration for stopping the static eliminator itself. It is possible to avoid a problem that the device is continuously used under a static elimination failure in which a large static elimination effect cannot be obtained.
[0026]
<Second embodiment>
A second embodiment of the present invention will be described with reference to FIGS.
The static eliminator according to the present embodiment is of a so-called DC voltage application type including a pair of positive and negative discharge electrodes 30 and 31 to which positive and negative DC high voltages are respectively applied. Then, ions generated by corona discharge in each of the discharge electrodes 30 and 31 by emitting air from the air supply ports 33 and 33 into the ion generation chamber 32 are discharged from the injection nozzle 35 communicating with the ion generation chamber 32 to the outside. It is configured to inject.
[0027]
FIG. 5 shows a specific configuration of the present embodiment. The ion generation chamber 32 has a mortar-shaped (tip tapered) wall surface, and an air discharge port 34 is formed at the tip end side. The air discharge port 34 is screwed with, for example, a wind guide connection portion 35a attached to one end of a bendable injection nozzle 35, so that the ion generation chamber 32 communicates with the injection nozzle 35. I have.
Next, on the wall surface of the ion generation chamber 32 facing the air discharge port 34, a pair of air supply units 36, 36 for emitting air supplied from gas supply means (not shown) into the ion generation chamber 32 at high speed. The respective air supply ports 33, 33 are arranged toward the air discharge port 34 side. With such a configuration, the air emitted from each of the air supply units 36 and 36 is guided to the air discharge port 34 along the mortar-shaped wall surface in the ion generation chamber 32.
[0028]
A pair of positive and negative discharge electrodes 30, 31 with the tips 30a, 31a directed toward the air discharge port 34 are provided inside the pair of air supply portions 36, 36 on the opposed wall surfaces. Are buried with their tip portions exposed, and their needle tips 30a, 31a are adjusted in position so as to be located near the air supply ports 33, 33 of the air supply units 36, 36. More specifically, each of the discharge electrodes 30, 31 is arranged such that air emitted from the air supply ports 33, 33 passes before the needle tips 30a, 31a. It should be noted that such a configuration is employed, even when the pressure in the entire ion generation chamber 32 rises, by suppressing the rise in the pressure around the needle tips 30a, 31a of the discharge electrodes 30, 31 to prevent corona discharge. This is for stabilization.
[0029]
In the present embodiment, a small-diameter communication hole 37 is formed at the center of the opposed wall surface, and a pressure sensor 38 is disposed at the back of the small-diameter communication hole 37, thereby forming the "barometric pressure measuring means" of the present invention. A thermistor 39 corresponding to the “temperature measuring means” of the present invention is disposed next to the thermistor 39. Thus, the ambient pressure and the ambient temperature of the pair of discharge electrodes 30, 31 can be measured.
[0030]
Next, the circuit configuration of the present embodiment will be described with reference to FIG. As shown in the figure, in the present embodiment, a pair of AC voltage power supplies 41 and 42 capable of adjusting the output voltage amplitude in accordance with a control signal level from the control circuit 40 are provided respectively in the pair of discharge electrodes 30 and 31. Is provided in correspondence with. The output of one of the AC voltage power supplies 41 is connected to one of the discharge electrodes 30 via a transformer 43, a negative voltage doubler rectifier circuit 44, and a current measuring resistor 45. As a result, a negative DC voltage is applied to the one discharge electrode 30, and negative ions are generated by corona discharge (hereinafter, this one discharge electrode is referred to as "negative discharge electrode 30"). On the other hand, the output of the other AC voltage power supply 42 is connected to the other discharge electrode 31 via a transformer 46, a positive voltage doubler rectifier circuit 47, and a current measuring resistor 48. Accordingly, a positive DC voltage is applied to the other discharge electrode 31, and positive ions are generated by corona discharge (hereinafter, the other discharge electrode is referred to as "positive discharge electrode 31").
[0031]
Current measuring resistors 45 and 48 are connected between the secondary coils of the transformers 43 and 46 and the ground, respectively. Since the current flowing through the current measuring resistors 45 and 48 changes substantially in proportion to the amount of positive and negative ions generated at the positive and negative discharge electrodes 30 and 31, these current measuring resistors 45 and 48 change. By measuring the 48 load voltages (shared voltages), it is possible to measure the amount of ions generated at each discharge electrode. Therefore, these current measuring resistors 45 and 48 correspond to "ion generation amount measuring means" of the present invention. The control circuit 40 is configured to take in the load voltages of the current measuring resistors 45 and 48 and to take in respective output signals from the pressure sensor 38 and the thermistor 39.
[0032]
Next, in the present embodiment, the surroundings inside the ion generation chamber 32 are driven while driving the static eliminator in a state in which dust or the like does not adhere to the discharge electrodes 30 and 31 of the positive electrode and the negative electrode (a normal state). By changing the atmospheric pressure and the ambient temperature, the load voltage level of the current measuring resistors 45 and 48 is measured for each combination of the ambient pressure and the ambient temperature, and these load voltage levels (hereinafter, “optimal levels”) are The data is stored in a memory (not shown) in association with the output levels from the pressure sensor 38 and the thermistor 39 at the corresponding ambient pressure and ambient temperature.
[0033]
When the static eliminator is started, the control circuit 40 sequentially takes in the output levels from the pressure sensor 38 and the thermistor 39 and the load voltage levels of the current measuring resistors 45 and 48 at a predetermined timing. Then, the optimum level corresponding to the combination of the output levels from the pressure sensor 38 and the thermistor 39 is read out, and two reference levels shifted up and down from the optimum level by a predetermined value are calculated. If the load voltage level of 48 is within the range between the two reference levels, it is regarded as normal. On the other hand, if the load voltage level is out of the range between the two reference levels, the operation indicator lamp 49 is turned on, for example, as the above-mentioned defective static elimination. Operate.
[0034]
According to such a configuration, it is possible to accurately detect the static elimination failure not only when the ambient pressure changes but also when the ambient temperature changes around the positive and negative discharge electrodes 30 and 31.
[0035]
<Other embodiments>
The present invention is not limited to the above-described embodiment. For example, the following embodiments are also included in the technical scope of the present invention, and further, various embodiments other than those described below may be made without departing from the scope of the invention. It can be changed and implemented.
(1) In the above-described second embodiment, the thermistor 39 is provided to detect the static elimination failure based on the reference level according to the ambient temperature in addition to the ambient pressure. However, the ion generation amount largely fluctuates due to a change in the ambient pressure. However, the change is relatively small depending on the change in the ambient temperature. Therefore, a configuration in which only the pressure sensor 16 is provided as in the first embodiment, and a static elimination failure is detected based on a reference level corresponding to the measured atmospheric pressure may be employed.
[0036]
(2) Further, in addition to the configuration of each of the above embodiments, a humidity sensor is provided near the discharge electrodes 10, 30, 31. In the first embodiment, a combination of output signals from the pressure sensor 16 and the humidity sensor, In the embodiment, the reference level may be determined based on a combination of output signals from the pressure sensor 38, the thermistor 39, and the humidity sensor.
[0037]
(3) In addition, a plurality of reference levels are provided corresponding to abnormal states such as leak, dirt deterioration, and no needle, and according to the result of comparing these with the load voltage levels from the current measurement resistors 28, 45, and 48. The detection signal may be output so that not only the presence / absence of static elimination failure but also each abnormal state can be identified.
[0038]
(4) In the above embodiments, the memory stores the load voltage level (optimum level) of the current measuring resistors 28, 45, and 48 in the normal state. However, the present invention is not limited to this. The configuration may be such that two reference levels shifted up and down by a predetermined value from the level are stored in the memory.
[0039]
(5) Also, without providing a storage unit such as a memory, a reference level is calculated by a predetermined arithmetic expression based on output signals from the pressure sensors 16, 38 and the thermistor 39 every time an operation for detecting a static elimination failure is performed. The configuration may be such that it is compared with the load voltage level of the current measuring resistors 28, 45 and 48 (configuration included in the invention of claim 1).
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between atmospheric pressure and the amount of generated positive and negative ions. FIG. 2 is a cross-sectional view of an ion generation chamber of a static eliminator according to a first embodiment. FIG. 3 is a circuit configuration diagram thereof. FIG. 5 is a diagram showing a temporal change of an output voltage and an applied voltage of a high voltage generating circuit. FIG. 5 is a cross-sectional view of an ion generation chamber of a static eliminator according to a second embodiment. FIG. ]
10, 30, 31 ... discharge electrodes 12, 32 ... ion generation chambers 16, 38 ... pressure sensors (barometric pressure measuring means)
20, 40 ... control circuit (static elimination failure detecting means)
22, 41, 42 ... AC voltage power supplies 28, 45, 48 ... Current measurement resistors (ion generation amount measuring means)
39 ... Thermistor (Ambient atmosphere measuring means)

Claims (4)

In a static eliminator that generates positive and negative air ions by applying a voltage to a discharge electrode by a voltage power source to generate corona discharge in the discharge electrode,
Atmospheric pressure measuring means for measuring the ambient pressure of the discharge electrode,
Ion generation amount measuring means for measuring the amount of ions generated by the corona discharge,
A static elimination failure detecting means for detecting a static elimination failure based on a measured ion production quantity measured by the ion production quantity measuring means and a reference ion production quantity corresponding to the measured atmospheric pressure measured by the atmospheric pressure measuring means. A static eliminator characterized by the above-mentioned. A storage unit in which a reference level corresponding to a reference ion generation amount according to a change in the ambient pressure is stored in advance in association with each ambient pressure.
The static elimination failure detecting unit reads the reference level corresponding to the measured atmospheric pressure measured by the atmospheric pressure measuring unit from the storage unit, and measures the read reference level and the ion generation amount measuring unit. 2. The static eliminator according to claim 1, wherein a comparison is made between the measured ion generation amount and a detection operation according to the comparison result. An ambient atmosphere measuring means for measuring at least one of an ambient temperature and an ambient humidity of the discharge electrode,
The static elimination failure detecting means detects a static elimination failure based on a measurement result by the ambient atmosphere measuring means in addition to a measured ion generation amount by the ion generation amount measuring means and a pressure measured by the atmospheric pressure measuring means. The static eliminator according to claim 1. In advance, a reference level corresponding to a reference ion generation amount corresponding to a change in the measurement result by the ambient pressure and the ambient atmosphere measuring means is stored in association with each combination of the ambient pressure and the measurement result by the ambient atmosphere measuring means. With storage means,
The static elimination failure detecting unit reads the reference level corresponding to the measured atmospheric pressure measured by the atmospheric pressure measuring unit and the measurement result measured by the ambient atmosphere measuring unit from the storage unit, and reads the read reference level. 4. The static eliminator according to claim 3, wherein the detected ion generation amount is measured by the ion generation amount measuring means, and a detection operation is performed according to the comparison result.

Images