JP3629968B2 - Air purifier control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a control device for an air cleaner applied to an abnormal discharge prevention control of an air cleaner provided with an abnormal discharge detector.
[0002]
[Prior art]
An air cleaner used for an air cleaner causes air sucked by a fan to flow through an ionization unit to which high voltage is applied, and charges dust contained in the air. The charged dust is attracted to the dust collection electrode located downstream and collected by being deposited.
[0003]
In such an air cleaner, when a large amount of dust accumulates on the dust collecting electrode, the impedance between the electrodes becomes small and abnormal discharge may occur. Dust collected is not only non-flammable, such as dirt, but also includes flammable substances such as cigarette tar and soot (carbon). There was a risk of problems with the combustible dust due to the discharge.
[0004]
Therefore, if the output level changed in a pulse form at the high voltage generator due to spark discharge continues for more than the reference time, abnormal discharge is detected, and if the output level stays for a certain time below the reference voltage (hereinafter referred to as red discharge), the air volume Japanese Patent Laid-Open No. 5-138071 discloses a technique for reducing the above.
Japanese Patent Laid-Open No. 5-138071 discloses a technique for detecting a spark discharge with reference to a voltage and reducing the pulse peak voltage of the electrostatic precipitator by a predetermined value when the number of pulses due to the spark discharge exceeds a predetermined number. It is disclosed in the publication.
Japanese Patent Laid-Open No. 52-55064 discloses a technique for detecting spark discharge when the discharge electrode voltage drops below a certain value and the discharge current exceeds a certain value.
[0005]
[Problems to be solved by the invention]
Conventional control devices for air purifiers detect the voltage or current waveform of the discharge electrode, and when there is a red discharge (to prevent frequent protective actions against temporary abnormalities), lower the output voltage and the air volume However, some abnormal discharges have a voltage that changes in a pulse shape (hereinafter referred to as blue discharge) or red discharge. There is also an irregular phenomenon that occurs intermittently and returns to the value at normal discharge for a moment, so that there is a problem that the abnormal discharge continues for a long time without entering the protection operation.
[0006]
The present invention has been made to solve the above problems, and since the risk of ignition is determined by the energy per unit time, when the voltage or current of the discharge electrode enters the region of blue discharge, By detecting how many pulses occur per set unit time, continuous blue discharge can be detected and a protective operation can be applied, and even if it occurs intermittently, the number of pulses generated can be reduced. The purpose is to obtain a control device that can reliably detect blue discharge and perform a protective operation by counting.
[0007]
In addition, since energy is determined by integrating voltage, current, and time, a discharge test is performed in advance to determine how much energy is generated in one cycle. It is possible to determine whether discharge can be tolerated.
[0008]
In addition, even when a red discharge occurs, the energy generated in the red discharge can be obtained by measuring the voltage drop and current rise values in advance and detecting the duration, so the voltage value is the reference voltage value. Detecting the time width exceeding, and applying a protective action when it lasts for a certain period of time, and even when blue and red discharges occur irregularly, calculate the energy generated in each discharge, An object of the present invention is to obtain a control device that can perform a protective operation when the reference energy Eref is exceeded per unit time.
[0010]
[Means for Solving the Problems]
The control device for an air cleaner according to the present invention comprises: an air cleaner having a discharge unit including an ionization unit and a dust collecting electrode; the discharge unit to which a high voltage is supplied by a high voltage generation unit; and an output change of the discharge unit. An abnormal discharge detection unit that detects abnormal discharge based on discharge data due to an abnormality, an output control signal is transmitted to the fan drive unit based on data from the abnormal discharge detection unit, and the fan is output- controlled, or voltage control is performed on the high-voltage generation unit sends a signal, a control unit for controlling the output voltage of the high voltage generating unit, before Symbol control section counts the pulse-like abnormal discharge within a predetermined reference time, when recognizing the transition to the abnormal discharge region In addition, an output control signal is sent to the fan drive unit to control the output of the fan, or a voltage control signal is sent to the high voltage generator to control the output voltage of the high voltage generator.
[0011]
Further, the control device for the air purifier of the present invention detects that the discharge in the discharge unit has shifted to the abnormal discharge region, and the abnormal discharge detection unit has reached the abnormal discharge , and the control unit has the protection region. When the energy Eref is generated, an output control signal is sent to the fan drive unit to control the output of the fan, or a voltage control signal is sent to the high voltage generation unit to control the output voltage of the high voltage generation unit.
[0012]
The control device for an air purifier according to the present invention detects that the discharge in the discharge unit has shifted to the abnormal discharge region and the abnormal discharge detection unit has reached abnormal discharge , and the control unit is predetermined. when the continuous abnormal discharge both the periodic abnormal discharge within the reference time has occurred the pulsed and abnormal discharge was counted within predetermined reference time, the total energy of the continuous abnormal discharge discharge protection When the energy Eref of the region is reached, an output control signal is sent to the fan drive unit to control the output of the fan, or a voltage control signal is sent to the high voltage generator to control the output voltage of the high voltage generator.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a block diagram showing a control device for an air purifier according to Embodiment 1 of the present invention, FIG. 2 is a flowchart of abnormal discharge detection, and FIG. 3 is a schematic diagram of a discharge voltage when discontinuous blue discharge occurs. FIG. 4, FIG. 4 and FIG. As shown in FIG. 1, in the first embodiment of the present invention, 1 is a high voltage generating unit, 2 is a discharge unit comprising an ionization unit and a dust collecting electrode, and 3 is an abnormal discharge detection for detecting the discharge voltage of this discharge unit. Reference numeral 4 denotes a control unit that controls the voltage of the high-voltage generating unit 1, 5 denotes a fan driving unit driven by a control signal of the control unit, and 6 denotes a fan driven by the fan driving unit. The control unit 4 detects the discharge form of the discharge unit 2 according to the discharge data from the abnormal discharge detection unit 3, and sends a voltage control signal to the high voltage generation unit 1 according to the occurrence of the abnormal discharge for output. The voltage is lowered or stopped, or an output variable signal is sent to the fan drive unit 5 to control the fan 6 to operate at low speed or stop operation.
[0014]
The abnormal discharge detection unit 3 constantly detects the discharge voltage or discharge current of the discharge unit 2 and starts the timer when the discharge unit 2 enters the abnormal discharge region and the voltage becomes lower than a predetermined voltage value Vref. When the blue discharge is counted N times in a predetermined unit time Tref, or the red discharge is continued for a predetermined time Tred, and the blue discharge and the red discharge are irregularly generated, When the total energy due to both discharges reaches a predetermined energy Eref within Tref, the control unit 4 detects the total energy Eref, lowers or stops the output voltage of the high voltage generation unit 1, and the fan drive unit 5 An output variable signal is sent, and the fan 6 is operated at low speed or stopped.
[0015]
In the abnormal discharge detection flowchart shown in FIG. 2, first, from the normal use state in step S1, if the voltage V <Vref in step S2, the Tref timer is started in step S3. In step S3, the Tref timer is started, and if [V ≦ Vref] <Tred in step S4, energy E is calculated in step S5. When the blue discharge is detected in step S6, the process proceeds to step S7 and the number of blue discharge pulses is counted. If E [Tref] = Eref in step S8, the process proceeds to step S9 and an abnormality detection protection signal is transmitted. If [V ≦ Vref] <Tred is not satisfied in step S4, red discharge is detected in step S10, and the process proceeds to step S9 to transmit an abnormality detection protection signal. Further, if the blue discharge is not detected in step S6 and the red discharge is detected in step S11, the process proceeds to step S8. If the red discharge is not detected, the process returns to step S1 after Tref elapses in step S12 and enters the normal state. Furthermore, if E [Tref] = Eref is not satisfied in step S8, the process returns to step S1 after Tref elapses in step S12 and enters a normal state.
[0016]
The schematic diagram of the discharge voltage when the blue discharge occurs discontinuously shown in FIG. 3 will be described. When the discharge voltage V becomes lower than Vref at the point a at the first blue discharge fall, the timer starts. When the blue discharge is counted N times within Tref and reaches the point b, the control unit detects the arrival of the point b, and transmits a control signal, which is a protection signal, to the high voltage generation unit and the fan drive unit for the protection operation. enter. As shown in FIG. 3, even if the corona discharge region, which is a steady state for a moment from the blue discharge, is entered, if the pulse is detected N times during Tref, the protection operation is surely started. Similarly to the above, when the blue discharge continues continuously, if the N pulses are generated during Tref, the control unit detects it and starts the protection operation before reaching the abnormal energy.
[0017]
Next, a schematic diagram when the red discharge shown in FIG. 4 is continuously generated will be described. When the red discharge is continuously generated, the abnormal discharge detection unit 3 detects the fall of the discharge voltage, the timer of the control unit 4 starts from the time of V = Vref, and the red discharge continues during the Tref period. Then, the control unit 4 detects the continuation of the red discharge and starts the protection operation.
[0018]
Next, the schematic diagram of the discharge voltage when the blue discharge and the red discharge shown in FIG. 5 occur irregularly will be described. As described in FIG. 4 above, when the timer starts from the time of V = Vref at the first blue discharge fall and the blue discharge is detected and the abnormal discharge shifts to the red discharge, the energy from the blue discharge is increased. In consideration, even when the red discharge is less than or equal to Tref, when the total energy with the blue discharge reaches Eref, the control unit 4 detects that the total energy has reached Eref and starts the protection operation. Similarly, when the red discharge first occurs, the control unit 4 detects that the total energy has reached Eref when the total energy of the red discharge and the blue discharge reaches Eref, and starts the protection operation.
[0019]
Next, a method for detecting abnormal discharge will be described in detail with reference to FIG. In the abnormal discharge detection unit 3, the discharge voltage of the discharge unit 2 is resistance-divided and taken into the voltage detection 3a. The divided voltage and a predetermined reference voltage value 3b are compared 3c. When the discharge voltage becomes smaller than the reference voltage value, the data signal is sent to the control unit 4.
[0020]
Next, the control unit 4 inputs a data signal to the pulse width detection 4a, and detects whether a blue discharge or a red discharge has occurred. At the same time, the Tref timer is started. Then, the number of blue discharge pulses generated during Tref and the red discharge duration time are counted, and the total energy is integrated by the pulse width detection integration 4b and compared with the energy reference value 4c 4d. As a result of comparison, if the energy generated in the discharge unit 2 during Tref is equal to or less than the reference value 4c, it is determined that the discharge is temporarily abnormal and is not extreme abnormal discharge, the protection operation is not performed, and the data is cleared. The If the generated energy is equal to or greater than the reference value 4c, it is determined that an abnormal discharge has occurred due to the abnormality detection 4e, and a control signal is sent to the high voltage generation unit 1 and the fan drive unit 6 to enter a protection operation.
[0021]
In the first embodiment, the abnormal discharge is detected from the change in voltage. However, when the abnormal discharge is detected from the change in current as in the second embodiment shown in FIG. It is also possible to start a Tref timer from the time when becomes equal to or higher than Iref and detect abnormal discharge by a change in current.
[0022]
In the first embodiment of the present invention, the case of a DC power supply has been described as an example. However, the same effect can be obtained when a pulse power supply is used.
[0024]
【The invention's effect】
As described above, the control device for an air purifier according to the present invention is an air purifier having a discharge unit including an ionization unit and a dust collecting electrode. abnormal discharge detection unit that detects abnormal discharge based on the discharge data by abnormality of the output change of section, this abnormal by the data from the discharge detection unit transmits an output control signal to the fan drive output controls the fan, or the high-pressure generator sends a voltage control signal to, a control unit for controlling the output voltage of the high voltage generating unit, before Symbol control section counts the pulse-like abnormal discharge within a predetermined reference time, to the abnormal discharge region when recognizing the transition, output controls the fan sends output control signal to the fan drive unit, or sends a voltage control signal to the high voltage generating unit, and a configuration which is adapted to control the output voltage of the high voltage generating section Et al., By integrating the abnormal discharge energy per unit time, without protection operation due to temporary anomalies frequently detects reliably abnormal discharge, has an advantage of being able to apply a protective operation.
[0025]
Further, the control device for the air purifier of the present invention detects that the discharge in the discharge unit has shifted to the abnormal discharge region, and the abnormal discharge detection unit has reached the abnormal discharge , and the control unit has the protection region. When the energy Eref is generated, an output control signal is sent to the fan drive unit to control the output of the fan, or a voltage control signal is sent to the high voltage generation unit to control the output voltage of the high voltage generation unit. By integrating the abnormal discharge energy per unit time, there is an effect that the abnormal discharge can be reliably detected and the protective operation can be applied without frequent protective operation due to a temporary abnormality.
[0026]
The control device for an air purifier according to the present invention detects that the discharge in the discharge unit has shifted to the abnormal discharge region and the abnormal discharge detection unit has reached abnormal discharge , and the control unit is predetermined. when the continuous abnormal discharge both the periodic abnormal discharge within the reference time has occurred the pulsed and abnormal discharge was counted within predetermined reference time, the total energy of the continuous abnormal discharge discharge protection When the energy Eref of the region is reached, an output control signal is sent to the fan drive unit to control the output of the fan, or a voltage control signal is sent to the high voltage generator to control the output voltage of the high voltage generator. In addition, the control unit also integrates the abnormal discharge energy per unit time, so that the abnormal discharge is reliably detected and the protective operation is applied without frequent protective operation due to temporary abnormality. It has the effect that can be.
[Brief description of the drawings]
FIG. 1 is a block configuration diagram of a control device for an air cleaner according to a first embodiment of the present invention.
FIG. 2 is a flowchart when an abnormal discharge occurs in the air cleaner according to the first embodiment of the present invention.
FIG. 3 is a schematic diagram of a waveform of a discharge voltage when blue discharge is generated in the air cleaner according to the first embodiment of the present invention.
FIG. 4 is a schematic diagram of a waveform of a discharge voltage when a red discharge is generated in the air cleaner according to the first embodiment of the present invention.
FIG. 5 is a schematic diagram of a waveform of a discharge voltage when red discharge and blue discharge are irregularly generated in the air cleaner according to the first embodiment of the present invention.
FIG. 6 is a block diagram showing a main part of the control device for the air cleaner according to the first embodiment of the present invention.
FIG. 7 is a schematic diagram of a waveform of a discharge current when red discharge and blue discharge are irregularly generated in the air cleaner according to the second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High voltage generation part, 2 discharge part, 3 abnormal discharge detection part, 4 control part, 5 fan drive part, 6 fan.

Claims (3)

In an air purifier having a discharge unit composed of an ionization unit and a dust collecting electrode, the discharge unit supplied with a high voltage by a high voltage generation unit, and detecting abnormal discharge based on discharge data due to abnormal output change of the discharge unit abnormal discharge detection unit that, the abnormal by the data from the discharge detection unit transmits an output control signal to the fan drive output controls the fan, or sends a voltage control signal to the high voltage generating unit, the output voltage of the high voltage generating section a control unit for controlling, before Symbol control section counts the pulse-like abnormal discharge within a predetermined reference time, when recognizing the transition to the abnormal discharge region, sends an output control signal to the fan drive A control device for an air purifier, characterized in that the output of a fan is controlled or a voltage control signal is sent to the high voltage generator to control the output voltage of the high voltage generator. The discharge in the discharge unit shifts to the abnormal discharge region, and the abnormal discharge detection unit detects that the abnormal discharge has been reached , and the control unit outputs to the fan drive unit when the energy Eref in the protection region is generated. 2. The control device for an air cleaner according to claim 1, wherein a control signal is sent to control output of the fan or a voltage control signal is sent to the high voltage generator to control the output voltage of the high voltage generator. The discharge in the discharge unit shifts to the abnormal discharge region, and the abnormal discharge detection unit detects that the abnormal discharge has been reached , and the control unit continuously detects periodic abnormal discharge within a predetermined reference time. when both such abnormal discharge occurs, the pulsed abnormal discharge was counted within predetermined reference time, when the total energy of the continuous abnormal discharge collector reaches the energy Eref the protected area, the fan drive 2. The control device for an air cleaner according to claim 1, wherein an output control signal is sent to control the output of the fan, or a voltage control signal is sent to the high voltage generator to control the output voltage of the high voltage generator.

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