JPH0478456A - Air cleaner - Google Patents

Abstract

PURPOSE:To obtain a dust collection function and a sterilization and deodorization function with one set of device by equipping an ozone decomposition means in the downstream of an air passage and selectively impressing positive or negative high voltage to one side of electrode of a discharge part. CONSTITUTION:Both a discharge part 4 for utilizing corona discharge and a dust collection part 5 for performing trapping due to an electrostatic field are arranged. An ozone decomposition means 19 is installed in the downstream of an air passage. Positive or negative high voltage is selectively impressed to one side of electrode 6 in a discharge part 4. As a result, presence of generation of ozone in the discharge part is controlled. For example, when negative voltage is impressed, a sterilization and deodorization function is obtained by generating ozone. Further when positive voltage is impressed, a dust collection function is obtained by inhibiting generation of ozone. These both functions are easily obtained with one set of device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an air purifier that can provide air purification and sterilization and deodorization functions in one device (prior art) Conventional air purifier Among these, the corona discharge type, as disclosed in Japanese Patent Application Laid-open No. 61-464, applies a high positive voltage to the ionization wire forming the discharge rod to suppress the generation of ozone and perform the dust collection function. Therefore, although the dust collection effect was obtained, the ozone sterilization effect was not obtained due to the low ozone concentration.

On the other hand, an ozone sterilizer that uses corona discharge generally generates highly concentrated ozone, releases it into a space to be sterilized, such as a room, and obtains the desired effect through the oxidation reaction.

(Problem to be solved by the invention) Therefore, due to such differences in function and usage,
It was necessary to perform dust collection and sterilization using separate equipment, which was complicated to operate, and it was uneconomical to have two sets of equipment.

It is an object of the present invention to solve these problems and provide an air cleaner that can provide dust collection functions and sterilization and deodorization functions with a single device, and can be rationalized in terms of configuration and use.

(Means for Solving the Problems) Therefore, the air cleaner of the present invention has a discharge section that utilizes corona discharge and a dust collection section that performs collection using an electrostatic field. An ozone decomposition means is provided downstream of the ozone decomposition means to remove ozone toxicity and to selectively apply a positive or negative high voltage to one electrode of the discharge section. It is possible to obtain a sterilizing and deodorizing function by generating ozone, and to obtain a dust collection function by suppressing ozone generation when a positive high voltage is applied.Both functions can be easily obtained with a stand-alone device, and its rational configuration. It is characterized by its ease of use.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. On the downstream side of the passage, a discharge section 4 that uses corona discharge and a dust collection section 5 that collects dust using an electrostatic field are spaced apart from each other.

The discharge section 4 is disposed upstream of the dust collection section 5, and as shown in the figure, it includes a plurality of discharge wires 6 forming discharge electrodes and a plurality of electrode plates 7 arranged opposite to the discharge wires 6. A positive or negative high voltage can be selectively applied to the discharge line 6.

That is, a changeover switch 9 is connected to the conducting wire 8 to which each discharge wire 6 is connected, and the negative terminal of the high voltage power supply 12 and the positive terminal of the high voltage power supply 13 are connected to the contacts 10.11 of the changeover switch 9. In this case, a single high-voltage power source may be shared through an appropriate connection switching means.

A positive or negative high voltage (negative in the embodiment) is applied to each electrode plate 7 through a conductive wire 14, and the dust collecting section 5 has a plurality of electrode plates 15 arranged in the ventilation direction as shown in the figure. However, a high voltage is applied to these via conductive wires 16 and 17. In the figure, reference numeral 18 denotes a high-voltage power supply connected to conductive wires 14, 16, and 17, and is set to a lower voltage than the high-voltage power supply 12.13.

An ozone decomposition means 19 such as a porous or honey-comb structure catalyst containing manganese dioxide as a main component or activated carbon is provided downstream of the dust collecting section 5. The fan 20 is arranged in a stepped manner so that ozone after decomposition treatment, air after dust removal, or undecomposed ozone can be discharged from the air outlet 21 to the outside of the casing.

(Function) The air purifier configured in this manner is provided with a discharge section 4 that uses corona discharge and a dust collection section 5 in the housing l, and these have a sterilization function and a dust collection function as described later, and - Since the same device can be used as both a conventional ozone sterilizer and a dust collector, the uneconomical and complicated handling of these devices as in the past is eliminated, and they can be used rationally.

Next, when the air purifier is not in use, the discharge part 4 and the dust collection part 5 are de-energized, and the fan 20 is deactivated. A purifier is installed, and the electric discharge part 4 and the dust collection part 5 are energized through the changeover switch 9 according to the usage mode, and the fan 20 is driven.

For example, when the air purifier is used as a sterilizer, the changeover switch 9 is connected to the contact 10 side, and when the air purifier is used as a collector am, the changeover switch 9 is connected to the contact 11 side.

Among these, when used as a sterilizer, selector switch 9
When connected to the contact 10 side, the discharge wire 6 of the discharge section 4 has
A negative voltage is applied from the high-voltage power supply 12 via the conducting wire 8, and corona discharge occurs between the discharge wire 6 and the electrode plate 7.

On the other hand, as the fan 20 is driven, air in the processing space is taken into the housing 1 from the air intake port 2 and passes between the discharge wire 6 and the electrode plate 7.

At this time, due to the ionization effect of the corona discharge, oxygen in the air around the electric field is converted to ozone, and a large amount of ozone is generated.

When the air containing ozone moves downstream and reaches the ozone decomposition means 19, a portion of it is collected inside the pores, oxidizes the organic components in the air, and releases the odor contained in the organic components. It decomposes and sterilizes bacteria.

On the other hand, untreated ozone that has not been decomposed by the ozone decomposition means 19 is removed from the air outlet 20 along with the air by the fan 20.
The environment is sterilized by the oxidation reaction of ozone that is discharged to the outside and released into the space to be sterilized.

-) If this device is installed in a closed space to be treated, such as a room or a small room in a house, and ozone is released into the space to be treated, mites, cockroaches, etc. can be exterminated.

Next, when the changeover switch 9 is connected to the contact 11 side depending on the usage mode of the dust collector, a positive voltage is applied to the discharge wires 6 of the discharge section 4 from the high voltage power supply 13 via the conductor wire 8, and these discharge wires 6 Corona discharge occurs between the discharge wire 6 and the electrode plate 7, and air taken into the housing l via the fan 20 passes between the discharge wire 6 and the electrode plate 7.

Therefore, the dust in the air is charged to a positive potential due to the ionization effect of the corona discharge.

Then, when the air containing the charged dust passes between the electrode plates 15 of the dust collecting section 5, the dust is attracted to the electrode plate 15 on the negative potential side under the action of Coulomb force and is collected. be done.

In this way, the air after dust removal moves further downstream and reaches the ozone decomposition means 19, where ozone is removed as it passes through the pores and is discharged to the outside from the air outlet 21.

In this way, in the present invention, by simply changing the polarity of the voltage applied to the discharge wire 6 using the changeover switch 9, it is possible to easily use the two devices for sterilization and dust collection, which greatly improves convenience. .

Then, in order to confirm the above effect, the inventors
The relationship between the applied voltage (kV) and current (iJ, A), and the ozone concentration (PPM) between the discharge section 4 and the dust collection section 5 at that time are determined by the wind speed of the fan 20, O, 5 m/s. I conducted the experiment below and got the results shown in the table below.

That is, when a positive voltage is applied to the discharge wire 6, the ozone concentration is at a minimum value, and it is confirmed that ozone is difficult to generate, and when a negative voltage is applied to the discharge wire 6, the ozone concentration is detected. It was confirmed that ozone was generated. It was also confirmed that when ozone is generated, a large current flows corresponding to the amount of energy consumed to generate ozone.

(Effects of the Invention) As described above, the air cleaner of the present invention is provided with an ozone decomposition means downstream of the ventilation path, and is capable of selectively applying a positive or negative high voltage to one electrode of the discharge section. Therefore, it is possible to control whether or not ozone is generated in the discharge section. For example, when a negative voltage is applied, ozone is generated to obtain a sterilization function, and when a positive voltage is applied, ozone generation is suppressed and a dust collection function is obtained. The present invention has the advantage that both of these functions can be easily obtained with a single device, and that it can be configured and used rationally.

[Brief explanation of drawings]

The figure is an explanatory diagram showing one embodiment of the present invention. 4...Discharge section 5...Dust collection section 19... Ozone decomposition means

Claims (1)

[Claims] In an air purifier that is equipped with a discharge section that uses corona discharge and a dust collection section that collects dust using an electrostatic field, an ozone decomposition means is provided downstream of the ventilation passage, and one electrode of the discharge section is connected to a positive or An air purifier characterized by being able to selectively apply a negative high voltage.