JP3529656B2 - Air purifier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaning device provided with an ionizer for generating ions to charge 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 the structure of a conventional air cleaning apparatus. In the figure, 101 is a rectangular tubular housing of a conventional air cleaning apparatus, 102 is a pre-filter such as a saran net and a non-woven fabric provided at one opening end of the housing 101, and 103 is a housing. Reference numeral 110 denotes a dust collecting cell set at the center of 101, 110 is an activated carbon filter provided on the downstream side of the dust collecting cell 103 having a deodorizing function, and 111 is provided at the other opening end of the casing 101. It is a blower.

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

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

By applying a positive high voltage 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 eject the electrons of the particles to charge the particles positively. The positively charged fine particles are attracted by the electrostatic force to the collector electrode plate 108 to which a negative voltage is applied in the collector 105.

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

The air from which the dust has been removed by the dust collection cell 103 passes through the activated carbon filter 110, and the casing 10
Spilled from 1.

In this way, dust collection for air is performed. In such an apparatus, dust collection efficiency decreases because dust adheres to and accumulates on the collector electrode plates 108 and 109 as the usage time increases. Instead, for example, the dust collection cell 103 is cleaned or replaced at regular intervals to maintain good dust collection efficiency.

[0009]

Since the conventional air cleaning device is constructed as described above, cleaning or replacement may be performed depending on the environment in which the device is used, despite its high dust collection efficiency. Since the dust collection efficiency is considerably low, cleaning or replacement is performed, and it is difficult to perform efficient maintenance in terms of dust collection function, maintenance cost, and the like.

It is also possible to detect the dirt on the collector electrode plates 108, 109 by measuring the amount of ions collected by the collector electrode plates 108, 109, but in that case, some dust is generated. Once deposited, the amount of recovered ions hardly changes, so it is difficult to accurately detect the degree of contamination of the collector electrode plates 108 and 109.

The present invention has been made to solve the above problems, and a monitoring frame for collecting ions not collected by the collector is provided, and based on the amount of ions collected by the monitoring frame. An object of the present invention is to obtain an air cleaning device that can accurately detect dirt on the collector electrode plate of the dust collecting cell by detecting dirt on the collector.

[0012]

An air purifying apparatus according to the present invention is arranged downstream of a collector and has a monitoring frame for collecting ions not collected by the collector, and an amount of ions collected by the monitoring frame. And a dirt monitor for detecting dirt on the collector based on the above.

In the air cleaning apparatus according to the present invention, the dirt monitoring section is provided with current value measuring means for measuring the current value from the monitoring frame.

The air purifying apparatus according to the present invention comprises a comparing section for comparing the amount of ions with a predetermined reference value, and an alarm section for issuing a warning according to 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 during the monitoring, and at other times, the potential of the monitoring frame is set to the high-voltage side of the collector. It is provided with a potential switching unit for setting an intermediate potential between the electrode plate and the low voltage side electrode plate.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a diagram showing a configuration of an air cleaning device according to a first embodiment of the present invention. In the figure, 1
Is a dust collecting cell set in the center of a casing (not shown) of the air cleaning device, and 2 is a saran net and a non-woven 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 arranged on the downstream side of the dust collection cell 1.
Is a monitoring frame which is an electrode plate that collects ions that have not been collected in 5. Is the power supply section set to
Reference numeral 6 denotes a dirt monitoring unit which is connected to the monitoring frame 4 and a ground point and detects dirt on the collector electrode plate 11 based on the amount of ions collected by the monitoring frame 4.

In the dust collecting cell 1, 11 is a low-voltage side collector electrode plate (collector, low-voltage side electrode plate, ionizer) whose potential is set to the ground potential, and 12 is alternately with the collector electrode plate 11. The collector electrode plate (collector, which is arranged on the high voltage side and to which a predetermined collector potential VC is applied)
A high-voltage side electrode plate) 13 is 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 dirt monitoring section 6, 21 is connected to the monitoring frame 4 and the current detecting resistor R, and a relay section for electrically connecting or disconnecting them 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 bring the monitoring frame 4 and the current detecting resistor R into a conductive state during monitoring, and a minute current detecting resistor R. Of the current from the monitoring frame 4 to the ground point is measured by measuring the voltage across the both ends of the A value measuring unit (current value measuring means, comparing unit, potential switching unit), and 23 is a warning generating unit (alarm unit) that issues a warning with a predetermined sound or light when a predetermined warning signal is supplied. is there.

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

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

By applying a positive high voltage 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 eject electrons of the particles to charge the particles positively. The positively charged fine particles are attracted to the collector electrode plate 11 which is at the ground potential by electrostatic force.

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

The air from which dust has been removed by the dust collection cell 1 passes between the monitoring frames 4. During dirt monitoring, the current value measuring section 22 of the dirt monitoring section 6 supplies a control signal to the relay section 21 so as to bring the monitoring frame 4 and the current detection resistor R into a conductive state, and the monitoring frame 4 Set the potential of to approximately the ground potential. In this case, the monitoring frame 4 includes the collector electrode plates 11, 1 of the dust collecting cell 1.
The positive ions remaining in the air that are not recovered by 2 are recovered.

At this time, when dust or the like is not accumulated on the collector electrode plate 11 and the 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 is accumulated 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 is
As a recovery amount of this ion, the voltage across the minute current detection resistor R is measured, the current value from the monitoring frame 4 to the ground point is calculated, and when the current value is equal to or greater than a predetermined reference value, Causes the warning generation unit 23 to generate a warning.

The dirt monitoring unit 6 is used at times other than the time of monitoring.
Current value measuring unit 22 turns off the relay unit 21,
The potential of the monitoring frame 4 is set to a floating potential. That is,
The potential of the monitoring frame 4 in this case is 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.
It becomes an intermediate potential with the potential of. For example, when the potential of the collector electrode plate 12 on the high voltage side is 8000 V 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 monitoring frame 4 has a potential of about 2000 to about 4000 volts.

The air passing between the monitoring frames 4 passes through the after filter 3 and is discharged from the air cleaning device.

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

Further, since the potential of the monitoring frame 4 is set to a floating potential except when the monitoring is performed, it is possible to obtain an effect that dust or the like is hardly deposited on the monitoring frame 4.

[0029]

As described above, according to the present invention, the monitoring frame disposed downstream of the collector for collecting ions not collected by the collector and the amount of ions collected by the monitoring frame are used. And a dirt monitor for detecting dirt on the collector. Therefore, there is an effect that the degree of dirt on the collector electrode plate of the dust collecting cell can be accurately detected. As a result, maintenance of the apparatus can be performed at an appropriate time, so that it is possible to maintain good dust collection efficiency and suppress an increase in maintenance cost.

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

[Brief description of drawings]

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

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

[Explanation of Codes] 1 Dust collection cell 4 Monitoring frame 6 Contamination monitoring section 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 unit (potential switching unit) 22 Current value measuring unit (current value measuring means, comparing unit, potential switching unit) 23 Warning generating unit (alarm unit)

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Claims (4)

(57) [Claims] 1. An air purifying apparatus comprising an ionizer that generates ions to charge dust in the air and a collector that is 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 contamination monitoring unit for detecting contamination of the collector based on the amount of ions collected by the monitoring frame. And an air purifier. 2. The air cleaning apparatus 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 comparison unit that compares the amount of ions with a predetermined reference value, and an alarm unit that issues a warning according to the comparison result of the comparison 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 during monitoring, and at other times, the potential of the monitoring frame is set to the high-voltage side electrode plate of the collector. The air cleaning apparatus according to claim 1, further comprising a potential switching unit that sets a potential intermediate to that of the low-voltage side electrode plate.