JP4871684B2 - Electric dust collector power supply - Google Patents

Description

  The present invention relates to a power supply device for an electrostatic precipitator, and more particularly to an apparatus for separately supplying monitoring power to an electrode of an electrostatic precipitator.

  FIG. 6 is a diagram showing a schematic configuration of a conventional electrostatic precipitator 100.

  The electric dust collector 100 includes a charging unit 3 and a dust collecting unit 5, and is charged when air containing dust passes through the charging unit 3, and the air containing the charged dust is collected by the dust collecting unit 5. When passing through, dust in the air is captured.

  More specifically, the charging unit 3 is provided with an electrode 7 and a grounded electrode 9, and the electrode 7 and the electrode 9 are separated from each other and insulated. Then, by applying a high voltage (for example, 7 kV) from the power source 102 to the electrode 7, corona discharge occurs between the electrode 7 and the electrode 9, and dust is charged.

  The dust collecting unit 5 is also provided with an electrode 13 and a grounded electrode 15, and the electrode 13 and the electrode 15 are separated from each other and insulated. Then, by applying a high voltage (for example, 2.5 kV) from the power source 102 to the electrode 13, the charged dust is captured by the electrode 15 in the illustrated embodiment.

  Each electrode 7, 9, 13, 15 is unitized to form a dust collection set 17. The dust collection set 17 can be easily attached to and detached from a housing (not shown) of the electric dust collector 1 and facilitates maintenance and the like. Further, an insulating member such as an insulator 19 is provided for maintaining insulation between the electrode 7 and the electrode 13 and the power source 102 and the casing.

  By the way, the electrode 7 may be a thin metal wire, but in that case, the wire breaks or adheres between the conductive dust electrode 7 and the case of the electrostatic precipitator 100 (around the insulator 19 etc.) after many years of use. As a result, the voltage of the electrode 7 may decrease (the insulation resistance of the electrode 7 may decrease). When the voltage of the electrode 7 decreases, not only does the performance of the electrostatic precipitator 100 deteriorate, but spark discharge or the like occurs between the electrode 7 and the casing of the electrostatic precipitator 100 or the electrode 15, resulting in an abnormal state.

  Therefore, when the voltage of the electrode 7 becomes equal to or lower than the reference value, the supply of power to the electrode 7 is stopped, and maintenance (cleaning or the like) for operating the electric dust collector 100 normally is performed.

  In addition, even when the electrostatic precipitator 100 sucks in high-humidity air due to the influence of weather or the like, dust adhering between the electrode 7 and the housing of the electrostatic precipitator 100 absorbs moisture, so that the electrode 7 and the electrostatic precipitator 100 are absorbed. The insulation state between the housing and the housing may deteriorate, and the voltage of the electrode 7 may decrease. Also in this case, the supply of power to the electrode 7 is stopped.

The voltage drop of the electrode 7 due to moisture absorption as described above (insulation failure of the electrode 7 due to moisture absorption) is temporary, and if the humidity of the air decreases, the insulation recovers in about several hours. In this case, the maintenance of the cleaning or the like is not particularly necessary, to be able to decrease the voltage of the electrode 7 is determined whether or not due to moisture absorption, it is necessary to maintenance, who maintenance electrical When maintenance of the dust collector 100 is performed, the insulation has already been recovered, and unnecessary maintenance man-hours are generated. In the electrode 13, as in the case of the electrode 7, a voltage drop occurs and maintenance is required.

Therefore, the voltage drop of the electrode 7 and the electrode 13, as an electric dust collector for detecting whether or not it is due to a decrease in the insulation resistance of each electrode 7 and 13 due to moisture absorption, 2% of the rated voltage It is known to apply a low voltage of 5% to an electrode and determine whether or not the voltage drop of the electrode is due to moisture absorption (see, for example, Patent Document 1).
Japanese Patent No. 3150431

  By the way, in the electric dust collector of patent document 1, since the voltage applied to an electrode is a low voltage, the voltage drop of an electrode cut | disconnects the feed wire for supplying electric power to an electrode, etc. The housing | casing of an electrode and an electrostatic dust collector, etc. It is possible to prevent secondary damage of the electrostatic precipitator (for example, secondary damage due to overheating or the like) in the case where the insulation resistance between the two is caused by the extreme decrease. However, since the insulation resistance of the electrode is detected by applying a low voltage, it is difficult to detect a voltage drop of the electrode that maintains a relatively large insulation resistance compared to the disconnection or the like, and the voltage of the electrode due to moisture absorption There is a problem that an error in detecting the decrease becomes large and a decrease in insulation resistance due to moisture absorption of the electrode may not be detected.

  The present invention has been made in view of the above problems, and provides an electric dust collector power supply device capable of reliably detecting a decrease in insulation resistance due to moisture absorption of an electrode while preventing secondary damage of the electrostatic dust collector. For the purpose.

According to the first aspect of the present invention, there is provided a power supply means having constant voltage and constant current load characteristics for supplying power to the electrode, and a voltage when the power is supplied to the electrode by the power supply means or the electrode. The detection means for detecting the insulation resistance, and whether or not the decrease in voltage detected by the detection means or the decrease in the insulation resistance of the electrode is caused by moisture constant voltage determined by supplying 0.1% to 10% of the power of said power supply means for supplying electric power at 40% to 100% of the voltage of the voltage supplied by said power supply means to the electrode a is And a power supply device for an electrostatic precipitator having a determination means having a constant current load characteristic.

According to a second aspect of the present invention, there is provided a first power supply means having a constant voltage and constant current load characteristic for supplying power to the electrode, and power is supplied to the electrode by the first power supply means. first detecting means for detecting the insulation resistance of the voltage or the electrode in the first a smaller power than the power supply means, 40% to 100% of the first power supply means voltage supplied in the voltage, a second power supply means for said first power supply means having a constant-voltage constant-current load characteristic supplying 0.1% to 10% of the power of the power supplied to the electrode, the first A second detection means for detecting a voltage or an insulation resistance of the electrode when power is supplied to the electrode by the second power supply means; and supplying power to the electrode by the first power supply means. When the first detecting means detects When the voltage is lower than a predetermined value over a predetermined time, or when the insulation resistance of the electrode is lower than a predetermined value over a predetermined time, The supply of power to the electrode is stopped, and after this stop, the voltage when the power is supplied to the electrode by the second power supply means or the insulation resistance of the electrode is detected by the second detection means. And a control unit that restarts the supply of power to the electrodes by the first power supply unit according to a detection result.

According to a third aspect of the present invention, in the electric dust collector power supply device according to the second aspect, the storage unit stores the voltage or the insulation resistance value detected by the second detection unit, and the control unit includes: After the supply of power by the first power supply means is stopped, the second detection means detects a voltage or an insulation resistance when power is supplied to the electrode by the second power supply means for a predetermined time. The detected value is stored in the storage means, and after a predetermined time has elapsed since the supply of power, the second power supply means supplies power to the electrode for a predetermined time, Or the insulation resistance is detected by the second detection means, and the detected value is compared with the value stored in the storage means, and the electrode by the first power supply means is determined according to the comparison result. Power supply Resume means Ru der.

  Advantageous Effects of Invention According to the present invention, there is an effect that it is possible to provide a power source device for an electrostatic precipitator that can reliably detect a decrease in insulation resistance due to moisture absorption of an electrode while preventing secondary damage of the precipitator.

  FIG. 6 is a diagram showing a schematic configuration of the electrostatic precipitator 1 according to the embodiment of the present invention.

  Except for the power supply (power supply device) 11, the electrostatic precipitator 1 and the conventional electrostatic precipitator 100 are configured in substantially the same manner. Therefore, as shown in FIG. 6, the schematic configuration of the electrostatic precipitator 1 and the schematic configuration of the conventional electrostatic precipitator 100 can be similarly expressed.

  The power supply device 11 of the electric dust collector 1 will be described in detail.

  FIG. 1 shows a schematic configuration of a portion 23 (hereinafter also referred to as “power supply device”) that supplies power to a dust collection set 17 in the power supply device 11 according to the embodiment of the present invention. FIG.

  The power supply device 23 supplies the dust collector 17 of the electrostatic precipitator 1 with power for operating the electrostatic precipitator 1 (for example, power having a rated voltage of 7 kV and a maximum current of 4.4 mA). (First power supply means) 25 is provided. The high-voltage power supply 25 for the air purifier supplies power to the dust collection set 17 by the high-voltage transformer 29 that receives a supply of power from the insulation transformer 27 and generates a DC high voltage (for example, 7 kV described above). And a first detection means (not shown) for detecting the voltage of the electrode 7 during the operation.

  As the first detection means, for example, means for detecting the output from the tertiary winding of the high-voltage transformer 29 as a signal, means for extracting the signal from the middle point where the high-voltage transformer output is connected in series with a resistor, etc. are used. can do.

Further, the power supply device 23 is a high voltage power supply for insulation evaluation having a constant voltage and constant current load characteristic for supplying power different from the high voltage power supply 25 for the air purifier to the electrode 7 (power supply for supplying power for monitoring; second power supply Power supply means) 31. The high voltage power supply 31 for insulation evaluation is 40% to the voltage (the rated voltage of 7 kV applied to the electrode 7) supplied by the high voltage power supply 25 for the air purifier, which is much smaller than the high voltage power supply 25 for the air purifier. According to the constant voltage and constant current load characteristics at a voltage of 100% (preferably 50% to 90%, more preferably 60% to 80%, even more preferably about 70% voltage; for example, a voltage of 4 kV) A voltage is supplied to the electrode 7. The constant voltage / constant current load characteristics (also referred to as constant voltage / constant current characteristics) are described in Japanese Patent Application Laid-Open No. 07-108192 filed by the applicant and will not be described here.

  The electric power supplied from the insulation evaluation high-voltage power supply 31 has a secondary failure such as overheating in the electric dust collector 1 due to a temperature rise caused by the leakage even if an insulation failure occurs and a current leaks from the electrode 7. Electric power that does not occur. Specifically, the insulation evaluation high-voltage power supply 31 is about 0.1% to 10% of the power supplied by the air purifier high-voltage power supply 25 (preferably about 0.2% to 5% power, More preferably, the power supply 31 has a characteristic of having a constant voltage of about 0.5% to 2%, even more preferably about 1.3%; for example, a rated voltage of 4 kV × maximum current of 80 μA. Electric power according to the constant current load characteristic is supplied to the electrode 7.

  The insulation evaluation high-voltage power supply 31 is supplied with power from the insulation transformer 27 and generates high voltage (for example, 4 kV described above), and the monitor high-voltage power supply 33 supplies power to the electrode 7. And a second detection means (voltage / current monitor) 35 for detecting the voltage of the electrode 7 during the operation.

As the second detection means, for example, means for detecting the output from the tertiary winding of the high voltage power supply for monitoring ( high voltage transformer ) 33 as a signal, the middle point where the high voltage power supply for monitoring is connected in series with a resistor It is possible to use a means for extracting a signal from the signal.

  The high voltage power supply 25 for the air purifier is provided with a high voltage / control circuit (control means) 39 including a microcomputer (CPU) 37, and the insulation monitoring high voltage power supply 31 includes an insulation monitor including a microcomputer (CPU) 41. A circuit (control means) 43 is provided. Note that signals can be exchanged between the microcomputer 37 and the microcomputer 41.

  Under the control of the microcomputer 37, when the power is supplied to the dust collection set 17 by the high-pressure power supply 25 for the air cleaner, the voltage detected by the first detection means is predetermined for a predetermined short time. When it becomes lower than this value, the supply of power to the dust collection set 17 by the high-voltage power supply 25 for the air purifier is stopped.

  When the microcomputer 41 receives a signal from the microcomputer 37 that stops the supply of power to the dust collection set 17 by the high-pressure power supply 25 for the air cleaner, the microcomputer 41 supplies power to the electrode 7 by the high-voltage power supply 31 for insulation evaluation after the stop. The voltage of the electrode 7 at that time is detected by the second detection means 35. As will be described in detail later, a signal indicating whether or not to resume the supply of power to the dust collection set 17 by the high-voltage power supply 25 for the air purifier is sent to the microcomputer 37 in accordance with the detection result. .

  When the restart signal is sent, the microcomputer 41 stops the power supply to the electrode 7 by the insulation evaluation high-voltage power supply 31, and the microcomputer 37 that receives the restart signal receives the high-voltage power supply 25 for the air purifier. The supply of power to the dust collection set 17 is resumed.

  For example, a diode 45 is provided on the power supply line of the high-voltage power supply 33 for monitoring, and a diode (not shown) is also provided on the power supply line of the high-voltage transformer 29. When power is being supplied to the electrode 7, a situation where power is supplied to the high voltage power supply 33 for monitoring is prevented, and when power is supplied to the electrode 7 by the high voltage power supply 31 for insulation evaluation, The situation where power is supplied to the high-voltage transformer 29 is prevented.

  Here, voltage and current characteristics of the high voltage power supply 25 for the air cleaner and the high voltage power supply 31 for insulation evaluation will be described with examples.

  FIG. 2 is a diagram showing voltage and current characteristics of the high-voltage power supply 25 for the air purifier and the high-voltage power supply 31 for insulation evaluation.

  In FIG. 2, the horizontal axis represents current and the vertical axis represents voltage. The high voltage power supply 25 for the air purifier shows a constant voltage and constant current load characteristic as shown by a graph G1 in FIG. 2 under the control of the microcomputer 37 and the like. As understood from the graph G1, the high voltage power supply 25 for the air purifier supplies a rated voltage of 7 kV between 0 μA and 4400 μA (4.4 mA), but the current is constant when the current becomes 4.4 mA. It has the characteristic that the voltage decreases. The maximum output of the high-voltage power supply 25 for the air cleaner is 7 kV × 4.4 mA = 30.8 W.

  The insulation evaluation high-voltage power supply 31 also exhibits characteristics such as a graph G3 shown in FIG. 2 under the control of the microcomputer 41 and the like. As understood from the graph G3, the insulation evaluation high-voltage power supply 31 supplies a rated voltage of 5 kV between 0 μA and 80 μA, but has a characteristic that the current is constant and the voltage decreases when the current reaches 80 μA. Yes. The maximum output of the high voltage power supply 31 for insulation evaluation is 5 kV × 80 μA = 0.4 W.

  Further, for example, in the high voltage power supply 31 for insulation evaluation of the power supply device 23, storage means for storing the voltage value detected by the second detection means 35 (may be the insulation resistance value of the electrode 7 calculated by the microcomputer 41). (Memory; not shown) is provided.

  Then, after the supply of power to the dust collection set 17 by the high-voltage power supply 25 for the air purifier is stopped, power is first supplied to the electrode 7 by the high-voltage power supply 31 for insulation evaluation under the control of the microcomputer 41 for a predetermined short time. The voltage of the electrode 7 at this time is detected by the second detection means 35, and this detection value (may be the insulation resistance value of the electrode 7 calculated by the microcomputer 41) is stored in the storage means. .

  Next, after a predetermined time (for example, 30 minutes) has elapsed since the first electric power was supplied to the electrode 7 by the insulation evaluation high-voltage power supply 31, the electrode 7 was supplied with the insulation evaluation high-voltage power supply 31 for a predetermined short time. Electric power is supplied for the time, the voltage of the electrode 7 at this time is detected by the second detection means 35, and this detection value (or the insulation resistance value of the electrode 7 calculated by the microcomputer 41) may be stored in the storage means. Compare with the stored value.

Subsequently, the whether the signal to resume the supply of power to the dust collecting set by the high-voltage power supply 25 for air cleaner adapted to deliver to the microcomputer 37.

  As for the comparison, what is stored in the storage means is the insulation resistance value of the electrode 7, and FIG. 3 (a graph for determining whether or not the high-voltage power supply 25 for the air purifier restarts the supply of power to the dust collection set 17. ).

  The horizontal axis of FIG. 3 shows the reference insulation resistance (insulation resistance value), and the vertical axis shows the recoverable insulation resistance (insulation resistance value). When the relationship between the reference insulation resistance and the recoverable insulation resistance is located on the upper side of the graph G5 in FIG. 3, that is, compared with the insulation resistance value of the electrode 7 when the first power is supplied. When the insulation resistance value of the electrode 7 tends to increase after a predetermined time has elapsed, the supply of power to the dust collection set 17 by the high-pressure power supply 25 for the air cleaner is resumed.

  More specifically, when the insulation resistance of the electrode 7 decreases and the voltage supplied to the dust collection set 17 by the air cleaner high-voltage power supply 25 falls below the reference value, the power of the air cleaner high-voltage power supply 25 is reduced. After the supply is stopped, power is supplied to the electrode 7 from the high voltage power source 31 for insulation evaluation, for example, for a short time first. At this time, since the insulation resistance of the electrode 7 is lowered, the voltage at the electrode 7 is lower than 5 kV (for example, 2 kV). The microcomputer 41 obtains the insulation resistance (25 MΩ) of the electrode 7 from the lowered voltage (2 kV) and the current of 80 μA, and the resistance value (reference insulation resistance) of 25 MΩ is stored in the storage means.

  Next, for example, after 30 minutes have passed since the initial power supply, the insulation evaluation high-voltage power supply 31 supplies power to the electrode 7 again for a short time, and the insulation resistance (recoverable) of the electrode 7 is the same as described above. Required insulation resistance). If the determined insulation resistance is 40 MΩ, for example, it is determined that the decrease in the insulation resistance of the electrode 7 is due to moisture absorption, and the supply of power to the dust collection set 17 by the high-pressure power supply 25 for the air purifier is resumed. For example, if the obtained insulation resistance does not recover for a long time, for example, 48 hours, it is determined that the cause of the decrease in the insulation resistance of the electrode 7 is due to factors other than moisture absorption (for example, severe disconnection of the power supply line or cleaning). Thus, the supply of power to the dust collection set 17 by the high-pressure power supply 25 for the air cleaner is not resumed, and a warning such as an alarm is issued from an output means (not shown).

  When the voltage detected by the first detection means becomes lower than a predetermined value for a predetermined short time, the supply of power to the dust collection set 17 by the high-pressure power supply 25 for the air purifier is stopped, After this stop, the voltage of the electrode 7 when power is supplied to the electrode 7 by the insulation evaluation high-voltage power supply 31 is detected by the second detection means 35, and this detected value is stored in the storage means instead of a predetermined value. The value is stored in a memory such as a ROM as a default value without rewriting, and if the value detected by the second detection unit 35 tends to be larger than the default value, it is determined that the value is due to moisture absorption. It may be.

  Next, the operation of the electrostatic precipitator 1 will be described by taking as an example the case where it operates using the insulation resistance of the electrode 7.

  FIG. 4 is a flowchart showing the operation of the electric dust collector 1.

  Under the control of the microcomputer 37 and the microcomputer 41, the rated voltage (7 kV) is applied to the dust collection set 17 by the high-voltage power supply 25 for the air cleaner, and the electrostatic dust collector 1 is in a state where the electrostatic dust collector 1 is operating (S 1). It is determined whether or not it is operating normally (S3).

  When the voltage supplied to the electrode 7 is decreased by the above judgment (S5), the supply of power to the dust collection set 17 by the high-pressure power supply 25 for the air cleaner is stopped, and the high-voltage power supply 31 for insulation evaluation is used. Electric power is supplied to the electrode 7 and the insulation resistance of the electrode 7 is measured (S7, S9).

  If the insulation resistance of the electrode 7 is larger than the threshold value and there is no problem (S7, S9), the rated voltage (7 kV) is applied to the dust collection set 17 by the high-voltage power supply 25 for the air purifier in the same manner as in step S1. 1 is operated (S21: empty cleaning operation). Then, the first detection means detects whether or not the voltage of the electrode 7 is lowered in this operating state (S23). If there is a voltage drop, the high voltage power supply 25 for the air cleaner is used. The supply of power to the dust collection set 17 is stopped, and a message indicating that an abnormality has occurred in the electric dust collector 1 is output by output means (not shown) (S25).

  When the insulation resistance of the electrode 7 is smaller than the threshold value (S7: Monitor power supply operation insulation measurement, S9), the supply of power to the dust collection set 17 by the high-voltage power supply 25 for the air purifier is stopped, and after this stop, the electrode 7 is supplied with electric power from the high voltage power supply 31 for insulation evaluation, the voltage of the electrode 7 is detected by the second detection means 35, the insulation resistance value of the electrode 7 is obtained, and the obtained value is stored in the storage means (S11). ).

  Subsequently, after 30 minutes have passed (S13), electric power is again supplied to the electrode 7 by the high voltage power supply 31 for insulation evaluation, and the voltage of the electrode 7 is detected by the second detection means 35 to obtain the insulation resistance value of the electrode 7. Then, the obtained resistance value is compared with the resistance value stored in the storage means to determine whether or not the insulation resistance value of the electrode 7 has been recovered (whether or not the insulation resistance has increased as shown in FIG. 3). (S14, S15). When the insulation resistance of the electrode 7 is restored in step S15, the supply to the dust collection set 17 by the air cleaner high-voltage power supply 25 is started, the air cleaner is operated normally (S16), and the process returns to step S3.

If the insulation resistance of the electrode 7 has not recovered in step S15, the process returns to step S13. An insulating measuring time intermittently, whether elapsed example 100 hours, or, in a continuous, for example, whether or not after 48 hours, determined using the total Tokite stage (not shown) (S17).

  Then, when the 100 hours have elapsed or the 48 hours have elapsed in step S17, an output means (not shown) reports that an abnormality has occurred in the electrostatic precipitator 1 (S19).

  According to the power supply device 23 of the electrostatic precipitator 1, a constant voltage capable of outputting a voltage of 40% to 100% of the voltage (rated voltage of the electrode 7 of the electrostatic precipitator 1) supplied by the high-voltage power supply 25 for the air cleaner. Since the insulation resistance of the electrode 7 can be detected with a power having a constant current load characteristic and smaller than the power supplied by the high-voltage power supply 25 for the air purifier, secondary damage due to overheating of the electrostatic precipitator 1 can be prevented. However, it is possible to reliably detect a decrease in insulation resistance due to moisture absorption of the electrode 7.

  That is, even when the insulation resistance of the electrode 7 is extremely reduced due to a short circuit or the like, the power supplied from the high voltage power supply 31 for insulation evaluation is small, so that secondary damage such as overheating can be prevented. In the case of poor insulation of the electrode 7 due to moisture absorption, the voltage supplied from the high voltage power supply 31 for insulation evaluation is considerably higher than the conventional voltage of 40% to 100% of the rated voltage of the electrode 7 of the electrostatic precipitator 1. Therefore, it is possible to accurately detect the insulation resistance of the electrode 7 with little error, and it can be determined whether or not the cause of the decrease in the insulation resistance is due to moisture absorption. And it can prevent that useless maintenance man-hours, such as cleaning of the dust collection set 17, generate | occur | produce.

  Further, according to the power supply device 23 of the electrostatic precipitator 1, after the supply of power by the high-voltage power supply 25 for the air purifier is stopped, the power is first supplied to the electrode 7 by the insulation evaluation high-voltage power supply 31 for a predetermined time, for example. The voltage of the electrode 7 is detected by the second detection means 35, and this detection value is stored in the storage means and compared with the next detection value, so whether or not the insulation failure of the electrode 7 is due to moisture absorption. More accurate judgment can be made.

  That is, the insulation resistance of the electrode 7 (the voltage detected by the second detection means 35) when the insulation failure occurs in the electrode 7 due to moisture absorption is the degree of contamination of the electrode 7, insulation, etc., and the first detection means. It fluctuates depending on factors such as detection error and the location where the electrostatic precipitator 1 is installed. Therefore, after the supply of power by the high-voltage power supply 25 for the air purifier is stopped, the voltage value (insulation resistance value) of the electrode 7 when power is first supplied to the electrode 7 by the high-voltage power supply 31 for insulation evaluation for a predetermined time. Will fluctuate.

  The voltage (insulation resistance) is detected when power is supplied to the electrode 7 by the high voltage power source 31 for insulation evaluation after a predetermined time has elapsed, with the voltage of the electrode 7 thus changing as a reference voltage (reference resistance). Since this detected voltage (insulation resistance value) is compared with the reference voltage (reference resistance), it is determined whether or not the insulation failure of the electrode 7 is due to moisture absorption regardless of the degree of contamination of the electrode 7 and the insulator. Can be judged accurately.

  The electric dust collector 1 is provided with a humidity sensor, and continuously measures the time when the humidity falls below a predetermined humidity. When the measured time becomes longer than the predetermined time, for example, the second electrode 7 The insulation resistance may be detected to determine whether or not the decrease in the insulation resistance of the electrode 7 is due to moisture absorption. By determining in this way, the cause of the decrease in the insulation resistance of the electrode 7 can be determined more accurately.

  By the way, the second detection means 35 is configured to detect the voltage of the electrode 7 using a photocoupler. Therefore, it is less susceptible to noise.

  Here, a configuration using a photocoupler will be described in detail with reference to FIG.

  The configuration includes a phototransistor 51, a comparator 53 to which an output voltage of the phototransistor 51 is supplied, and a phototransistor 55 to which an output of the comparator 53 is input. The comparator 53 receives a signal (a high voltage power supply high voltage monitor signal) from the voltage / current monitor 35.

  Under the control of the microcomputer 41, when light as shown in FIG. 5A is input to the phototransistor 51 using light emitting means such as an LED, the phototransistor 51 as shown in FIG. A correct voltage waveform is output, and the output voltage waveform is input to the comparator 53. The comparator 53 compares the voltage waveform as shown in FIG. 5 (b) with the voltage waveform of the signal from the voltage / current monitor 35, and the voltage value shown in FIG. Only when the voltage is higher than the signal voltage, an output signal is output from the phototransistor 55, and this output signal is detected by the microcomputer 41 to detect the insulation state of the electrode 7. The signal exchange between the microcomputers 37 and 41 may be similarly performed using a photocoupler, and the first detection unit is configured to detect the voltage of the electrode 7 using a photocoupler. May be.

  The power source device 23 of the electrostatic precipitator 1 includes power supply means for supplying power to the electrodes, and detection means for detecting a voltage or an insulation resistance of the electrodes when power is supplied to the electrodes by the power supply means. Whether or not the decrease in voltage detected by the detection means or the decrease in the insulation resistance of the electrode is caused by moisture, the power supply means having a smaller output than the power supply means. The power source of the electrostatic precipitator having judgment means for judging by supplying electric power to the electrode with a constant voltage constant current load characteristic capable of outputting a voltage of 40% to 100% of the voltage supplied by It is an example of an apparatus.

It is a figure which shows schematic structure of the power supply device which supplies electric power to the electrode of a dust collection part among the power supply devices which concern on embodiment of this invention. It is a figure which shows the voltage and electric current characteristic of the high voltage power supply for air cleaners, and the high voltage power supply for insulation evaluation. It is a figure which shows the graph for determining whether the high voltage | pressure power supply for air cleaners restarts supply of electric power to an electrode. It is a flowchart which shows operation | movement of an electric dust collector. It is a figure which shows schematic structure of the detection means using a photocoupler. It is a figure which shows schematic structure of the electrostatic precipitator (conventional electrostatic precipitator) which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric dust collector 13 Electrode 23 Power supply device 25 High voltage power supply for air cleaners (1st power supply means)
31 High voltage power supply for insulation evaluation (second power supply means)
39, 43 Control means

Claims (3)

A power supply means having a constant voltage constant current load characteristic for supplying power to the electrode;
Detecting means for detecting a voltage or an insulation resistance of the electrode when power is supplied to the electrode by the power supply means;
Whether the decrease in voltage detected by the detection means or the decrease in insulation resistance of the electrode is due to moisture, the power supply means has a smaller output than the power supply means, and the power supply means Judgment having constant voltage and constant current load characteristics for judging by supplying 0.1% to 10% of the power supplied by the power supply means to the electrode at a voltage of 40% to 100% of the supplied voltage Means,
An electric dust collector power supply device comprising: First power supply means having constant voltage and constant current load characteristics for supplying power to the electrodes;
First detection means for detecting a voltage or an insulation resistance of the electrode when power is supplied to the electrode by the first power supply means;
The first a smaller power than the power supply unit, 0.1 of the first of said first power supply means for supplying electric power at 40% to 100% of the voltage of the power supply means voltage supplied A second power supply means having constant voltage and constant current load characteristics for supplying power of 10% to 10% to the electrode;
Second detection means for detecting a voltage or an insulation resistance of the electrode when power is supplied to the electrode by the second power supply means;
When power is supplied to the electrode by the first power supply means and the voltage detected by the first detection means is lower than a predetermined value over a predetermined time, or When the insulation resistance of the electrode becomes smaller than a predetermined value over a predetermined time, the supply of power to the electrode by the first power supply means is stopped, and after this stop, the second power supply means Then, the voltage when the power is supplied to the electrode or the insulation resistance of the electrode is detected by the second detection means, and the supply of power to the electrode by the first power supply means according to the detection result A control means for resuming
An electric dust collector power supply device comprising: In the electric dust collector power supply device according to claim 2,
Storage means for storing the voltage or insulation resistance value detected by the second detection means;
The control means supplies a voltage or an insulation resistance when the power is supplied to the electrode by the second power supply means for a predetermined time after the supply of power by the first power supply means is stopped. Detected by the detection means, the detected value is stored in the storage means, and after a predetermined time has elapsed since the power supply, the electrode is supplied with power for a predetermined time by the second power supply means. The voltage or insulation resistance at this time is detected by the second detection means, the detected value is compared with the value stored in the storage means, and the first power is determined according to the comparison result. Means for resuming the supply of power to the electrodes by a supply means ;
Power supply that electrical dust collector be characterized in that.

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