JP2000225357A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the fouling of collector electrode plates in a dust collection cell correctly by installing monitoring frames for recovering ions which were not recovered by a collector and detecting the fouling of the collector based on the quantity of recovered ions. SOLUTION: Dust in air is removed by a pre-filter 2 and a dust collection cell 1, and the air is passed between monitoring frames 4. The amperage measuring part 22 of a fouling monitoring part 6 supplies a control signal to a relay part 21 to make the frames 4 and current detecting resistance R conductive, and sets up the electric potential of the frames 4 at a grounding potential. The frames 4 recover cations remaining in air which were not recovered by each collector electrode plate 11, 12. The amperage measuring part 22 measures both end voltages of the resistance R as the amount of recovered ions, calculates amperage from the frames 4 to a grounding point, and actuates an alarm generating part 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier having an ionizer for generating ions and charging dust in the air, and a collector downstream of the ionizer for absorbing dust charged by the ions. is there.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing a configuration of a conventional air cleaning device. In the figure, 101 is a rectangular cylindrical casing of a conventional air cleaning device, 102 is a pre-filter such as a saran net and a nonwoven fabric provided at one open end of the casing 101, and 103 is a casing. Reference numeral 101 denotes a dust collection cell set at the center of the dust collection cell, 110 denotes an activated carbon filter having a deodorizing function and the like provided downstream of the dust collection cell 103, and 111 denotes a dust collection cell provided at the other open end of the housing 101. It was a blower.

In the dust collection cell 103, reference numeral 104 denotes an ionizer in which a plurality of discharge electrodes 106 such as a tungsten wire and a plurality of grounded electrode plates 107 are alternately arranged, and 105 denotes a collector electrode to which a negative voltage is applied. Board 108
And a collector electrode plate 109 to which a positive voltage is applied is alternately arranged.

Next, the operation will be described. Blower 111
By the operation described above, a pressure difference is generated between one open end of the housing 101 and the other open end, and an air flow is generated in the housing 101. Then, air from which relatively large dust and the like have been removed by the pre-filter 102 flows into the dust collection cell 103.

When a high positive voltage is applied to the discharge electrode 106 of the ionizer 104, an electrostatic field having a strength corresponding to the applied voltage is generated around the discharge electrode 106. In this electrostatic field, free electrons in the air are accelerated toward the discharge electrode 106, collide with particles of fine particles such as dust, and emit electrons of the fine particles, thereby positively charging the fine particles. The positively charged fine particles are attracted to the collector electrode plate 108 to which the negative voltage is applied by the collector 105 by electrostatic force.

Incidentally, the fine particles may be negatively charged in the ionizer 104 in some cases. The negatively charged fine particles are attracted to the collector electrode plate 109 to which a positive voltage is applied in the collector 105 by electrostatic force.

[0007] The air from which dust has been removed by the dust collection cell 103 passes through the activated carbon filter 110 and passes through the casing 10.
Flowed out of 1.

[0008] In this way, dust collection for air is performed. In such an apparatus, as the usage time increases, dust adheres and accumulates on the collector electrode plates 108 and 109, so that the dust collection efficiency is reduced. In particular, the contamination of the collector electrode plates 108 and 109 is taken into consideration. Instead, for example, the dust collection cell 103 or the like is cleaned or replaced at regular intervals to maintain good dust collection efficiency.

[0009]

Since the conventional air purifying apparatus is configured as described above, depending on the use environment of the apparatus, cleaning or replacement may be performed despite high dust collection efficiency, Cleaning or replacement is performed after the dust collection efficiency is considerably reduced, and there is a problem that it is difficult to perform efficient maintenance in terms of dust collection function, maintenance cost, and the like.

Incidentally, it is conceivable to detect the dirt on the collector electrode plates 108 and 109 by measuring the amount of ions collected by the collector electrode plates 108 and 109, but in this case, some dust is generated. When deposited, the amount of ions collected hardly changes, making it difficult to accurately detect the degree of contamination of the collector electrode plates 108 and 109.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A monitoring frame for recovering ions not recovered by the collector is provided, and based on the amount of ions recovered by the monitoring frame. It is an object of the present invention to obtain an air purifying device that detects a stain on a collector and accurately detects a stain on a collector electrode plate of a dust collection cell.

[0012]

An air purifying apparatus according to the present invention is disposed downstream of a collector, and a monitoring frame for recovering ions not recovered by the collector, and an amount of ions recovered by the monitoring frame. And a dirt monitoring unit for detecting dirt on the collector based on the data.

[0013] In the air purifying apparatus according to the present invention, the dirt monitoring unit includes current value measuring means for measuring a current value from the monitoring frame.

An air purifying apparatus according to the present invention includes a comparing section for comparing the amount of ions with a predetermined reference value, and an alarm section for generating a warning in accordance with the comparison result of the comparing means.

In the air cleaning apparatus according to the present invention, the potential of the monitoring frame is set to the potential of the low voltage side electrode plate of the collector only at the time of monitoring, and at other times, the potential of the monitoring frame is set to the potential of the high voltage side of the collector. It has a potential switching unit for setting the potential to an intermediate potential between the electrode plate and the low-voltage side electrode plate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a diagram showing a configuration of an air cleaning device according to Embodiment 1 of the present invention. In the figure, 1
Is a dust collection cell set at the center of a casing (not shown) of the air cleaning device, and 2 is a saran net and a nonwoven fabric provided at one open end of the casing (not shown) of the air cleaning device. 3 is an after filter such as an activated carbon filter provided on the downstream side of the dust collection cell 1, and 4 is disposed on the downstream side of the dust collection cell 1.
Reference numeral 5 denotes a monitoring frame which is an electrode plate for collecting ions not collected in the first embodiment. Reference numeral 5 is connected to a predetermined power source and changes the potentials of the collector electrode plates 11 and 12 and the discharge electrode 13 of the dust collection cell 1 to a predetermined potential. Power supply section,
Reference numeral 6 denotes a dirt monitoring unit that is connected to the monitoring frame 4 and the ground point, and that detects dirt on the collector electrode plate 11 based on the amount of ions collected by the monitoring frame 4.

In the dust collection cell 1, reference numeral 11 denotes a low-voltage side collector electrode plate (collector, low-voltage side electrode plate, ionizer) whose potential is set to the ground potential, and 12 denotes a collector electrode plate 11 alternately. A high-voltage-side collector electrode plate (collector,
Reference numeral 13 denotes a discharge electrode (ionizer), such as a tungsten wire, which is alternately arranged with the collector electrode plate 11 and to which a predetermined high potential VI is applied.

In the contamination monitoring section 6, a relay section 21 is connected to the monitoring frame 4 and the current detecting resistor R, and electrically connects or disconnects the two according to a control signal from the current value measuring section 22. Reference numeral 22 denotes a (potential switching unit) which supplies a control signal to the relay unit 21 so as to make the monitoring frame 4 and the current detecting resistor R conductive during monitoring, and supplies a minute current detecting resistor R Is measured to calculate the current value from the monitoring frame 4 to the ground point. If the current value is equal to or greater than a predetermined reference value, a predetermined warning signal is supplied to the warning generating unit 23. A value measurement unit (current value measurement unit, comparison unit, potential switching unit), and a warning generation unit (alarm unit) 23 that issues a warning by a predetermined sound or light when a predetermined warning signal is supplied. is there.

Further, the air cleaning device is provided with a blower (not shown) for passing air through the dust collecting cell 1 and the like.

Next, the operation will be described. Due to the operation of the blower (not shown), a flow of air is generated in the housing of the air cleaning device. Then, air from which relatively large dust and the like have been removed by the pre-filter 2 flows into the dust collection cell 1.

When a high positive voltage is applied to the discharge electrode 13, an electrostatic field having a strength corresponding to the applied voltage is generated around the discharge electrode 13. In this electrostatic field, free electrons in the air are accelerated toward the discharge electrode 13, collide with particles of fine particles such as dust, and emit electrons of the fine particles to charge the fine particles positively. The positively charged fine particles are adsorbed to the grounded collector electrode plate 11 by electrostatic force.

The fine particles may be negatively charged in some cases.
The negatively charged fine particles are attracted to the collector electrode plate 12 to which a positive voltage is applied by electrostatic force.

The air from which dust has been removed by the dust collection cell 1 passes between the monitoring frames 4. At the time of monitoring the dirt, the current value measuring unit 22 of the dirt monitoring unit 6 supplies a control signal to the relay unit 21 so as to make the monitoring frame 4 and the current detection resistor R conductive. Is set to approximately the ground potential. In this case, the monitoring frame 4 includes the collector electrode plates 11 and 1 of the dust collection cell 1.
2. The positive ions remaining in the air without being collected by step 2 are collected.

At this time, if dust and the like are not deposited on the collector electrode plate 11 and dust collection efficiency is good, the amount of positive ions collected by the monitoring frame 4 is low. On the other hand, when a large amount of dust or the like is deposited on the collector electrode plate 11,
Since the surface potential of the deposit becomes higher than the potential of the collector electrode plate 11, the amount of ions collected by the collector electrode plate 11 decreases, and the amount of positive ions collected by the monitoring frame 4 increases. The current value measuring unit 22 of the dirt monitoring unit 6
As the amount of recovered ions, the voltage between both ends of the minute current detection resistor R is measured, and the current value from the monitoring frame 4 to the ground point is calculated. When the current value is equal to or larger than a predetermined reference value, Causes the warning generation unit 23 to generate a warning.

At times other than monitoring, the dirt monitoring unit 6
Current value measurement unit 22 turns off relay unit 21,
The potential of the monitoring frame 4 is set to a floating potential. That is,
In this case, the potential of the monitoring frame 4 is different from the potential of the collector electrode plate 12 on the high voltage side and the potential of the collector electrode plate 11 on the low voltage side.
And the intermediate potential between the two. For example, when the potential of the collector electrode plate 12 on the high voltage side is 8000 volts and the potential of the collector electrode plate 11 on the low voltage side is the ground potential,
The monitoring frame 4 is arranged such that the potential of the monitoring frame 4 becomes a potential of about 2000 to about 4000 volts.

The air that has passed between the monitoring frames 4 passes through the after-filter 3 and flows out of the air cleaning device.

As described above, according to the first embodiment, the monitoring frame 4 for collecting ions not collected by the collector electrode plate 11 is provided, and based on the amount of ions collected by the monitoring frame 4. As a result, the degree of contamination of the collector electrode plate 11 of the dust collection cell 1 can be accurately detected.

In addition, since the potential of the monitoring frame 4 is set to the floating potential at times other than during monitoring, an effect is obtained that dust and the like hardly accumulate on the monitoring frame 4.

[0029]

As described above, according to the present invention, a monitoring frame disposed downstream of a collector for recovering ions not recovered by the collector and an amount of ions recovered by the monitoring frame are determined. And a dirt monitoring unit for detecting dirt on the collector, so that the degree of dirt on the collector electrode plate of the dust collection cell can be accurately detected. As a result, maintenance of the apparatus can be performed at an appropriate time, so that good dust collection efficiency can be maintained and an increase in maintenance cost can be suppressed.

According to the present invention, only during monitoring,
The potential of the monitoring frame is set to the potential of the low-voltage side electrode plate of the collector, and at other times, the potential of the monitoring frame is set to
Since the potential is set at an intermediate level between the high-voltage side electrode plate and the low-voltage side electrode plate of the collector, there is an effect that dust and the like hardly accumulate on the monitoring frame.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an air cleaning device according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional air cleaning device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Dust collection cell 4 Monitoring frame 6 Dirt monitoring part 11 Collector electrode plate (collector, low voltage side electrode plate, ionizer) 12 Collector electrode plate (collector, high voltage side electrode plate) 13 Discharge electrode (ionizer) 21 Relay part (potential switching) Section) 22 Current value measurement section (current value measurement means, comparison section, potential switching section) 23 Warning generation section (alarm section)

Claims (4)

[Claims] 1. An air purifying apparatus comprising: an ionizer that generates ions to charge dust in the air; and a collector downstream of the ionizer and that adsorbs dust charged by the ions. A monitoring frame for collecting the ions not collected by the collector, and a dirt monitoring unit for detecting dirt on the collector based on the amount of ions collected by the monitoring frame. And air purifier. 2. The air cleaning device according to claim 1, wherein the dirt monitoring unit includes a current value measuring unit that measures a current value from the monitoring frame. 3. The air purifier according to claim 1, further comprising: a comparing unit that compares the ion amount with a predetermined reference value; and an alarm unit that generates a warning according to a comparison result of the comparing unit. apparatus. 4. The potential of the monitoring frame is set to the potential of the low voltage side electrode plate of the collector only at the time of monitoring, and at other times, the potential of the monitoring frame is set to the potential of the high voltage side electrode plate of the collector. 2. The air purifying apparatus according to claim 1, further comprising a potential switching unit that sets a potential between the low-voltage side electrode plate and the intermediate voltage.