JPH03114512A - Air cleaner - Google Patents

Abstract

PURPOSE:To ensure the evolution of ozone gas and facilitate the startup of an air cleaner by providing an electric heater inside a plate-like dielectric. CONSTITUTION:There are provided in an air passage an ozone adding part, a filter part 14 such as minipleat filter and an ozone killer 17 in that order from its upstream side. The ozone gas adding part is provided with an ozonizer fitted with a linear corona discharge electrode 5 and a plane inductive electrode 6 with a part of a plate-like dielectric 4 interposed therebetween and the plate- like dielectric 4 is also provided with an electric heater 7 in its interior. This permits a creeping discharge to be produced on the side of the linear corona discharge electrode 5 of the ozonizer immediately even after the startup of the air cleaner in a room high in humidity, thereby ensuring the evolution of the ozone gas and facilitating the startup of the air cleaner.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an air purifier for deodorizing the air and removing dust in the interiors of automobiles, ships, aircraft, general buildings, etc. be.

[Prior art] A conventional air purifier integrates a linear corona discharge electrode and a planar induction electrode through a portion of a plate-shaped dielectric made of alumina porcelain in a flowing air containing malodorous gas components. Ozone gas generated by an ozonizer installed in It passes through an ozone killer made up of a layer of decomposition catalyst and activated carbon to remove residual ozone gas, making it dust-free and odorless, and then discharging it into the atmosphere.

Therefore, in this air purifier, when the humidity of the air containing malodorous gas components is high, a thin adsorbed water film is formed on the surface of the linear electrode side of the alumina porcelain layer that constitutes the ozonizer, and this forms a planar electrode. As a result, creeping discharge may not occur on the surface of the ozonizer.

This phenomenon is particularly noticeable when the outside air is humid, such as during the rainy season, and when the device is stopped, cooled, and then started, and in that case, it becomes impossible to start.

[Problems to be Solved by the Invention] The purpose of the present invention is to add ozone gas generated by an ozonizer, which is integrally provided with a linear discharge electrode and a planar induction electrode via a planar dielectric, to contaminated air. In this air purifying device, the odor in the air is deodorized and dust is removed through a mini-pleated filter, and then the air containing the residual ozone gas is filtered through a layer of ozone gas and discharged into the atmosphere. Even if the air purifier is started in a humid room, creeping discharge immediately occurs on the ozonizer's linear electrode side, ensuring the generation of ozone gas and making it easier to start the air purifier. It is.

Another purpose is to prevent the concentration of ozone gas on the upstream side of Ozone Killer from reaching a predetermined concentration required for deodorization due to some malfunction, or the concentration of ozone gas on the downstream side of Ozone Killer to fall below a predetermined value that is safe for the human body. If this is not the case, the entire deodorizing device will automatically stop, resulting in incomplete deodorization of the foul-smelling gas, or ozone gas exceeding a predetermined concentration will be emitted into the atmosphere, causing damage to the surrounding human body, etc. This is to ensure that there is no negative impact on the

[Means for Solving the Problems] The air purifier of the present invention includes an ozone gas adding section, a filter section such as a mini-pleat filter, and an ozone killer, which are sequentially provided in the air passage from the upstream side, and a plate-shaped dielectric material is provided in the ozone gas adding section. An ozonizer having a linear corona discharge electrode and a planar induction electrode is provided through a portion thereof, an electric heater is buried in the plate-like dielectric body, and a high concentration ozone gas sensor is provided downstream of the ozone gas addition section. In addition, a low concentration ozone gas sensor is provided downstream of the ozone killer.

[Operation] The air purifier of the present invention is installed in a room where contaminated air is to be purified by deodorization and dust removal, and the air in the room is flowed from upstream to downstream in the air passage of the air purifier. At the same time, the ozone gas generated by the ozonizer is ejected into the air containing the odorous gas components and dust flowing in the air passage, and the odorous gas components are strongly oxidized and decomposed with the ozone gas to deodorize them. f & The air containing residual ozone gas and dust flows toward one side of the mini-pleated filter, where the dust contained in the air is removed, and the air containing the residual ozone gas is further removed. flows toward one side of ozone killer,
Here, the ozone gas remaining in the air is decomposed to make air harmless to the human body, which is then returned to the room to be cleaned. In this case, the reaction between the malodorous gas and ozone occurs not only in the gas phase of the deodorizing space but also in the state where ozone is adsorbed on the filter element forming a part of the mini-pleat type filter.

[Embodiment] An embodiment of the present invention will be described with reference to the accompanying drawings.In the air passage 2 formed in the casing 1, from upstream to downstream, a screen 3 made of wire mesh or the like, alumina porcelain, etc. A linear corona discharge electrode 5 and a planar induction electrode 6 are integrally arranged through a layer 4a of a part of a plate-like dielectric 4 formed of an ozone gas addition unit 28 comprising an ozonizer 8 with an electric heater 7 embedded in the plate-shaped dielectric 4;
An ionizer 12 in which a discharge electrode and a counter electrode 10 are separated from each other by a space 11, a dust collecting section 16 in which electrodes 15a and 15b are arranged on both sides of a mini-pleated filter 14, and an ozone decomposition catalyst or An ozone killer 17 made of activated carbon is provided, and a high frequency high voltage power source 18 is connected between the linear corona discharge electrode 5 and the planar induction electrode 6 of the ozonizer 8, and a creeping discharge is generated on the surface of the plate dielectric 4. 20 and the discharge type f of the ionizer 12.
A DC high-voltage power supply 21 is connected between I9 and the opposing @pole 10, and between a pair of electrodes 15a and 15b provided on both sides of the mini-pleated filter 16 of the dust collecting section 16, respectively, to form a DC electric field. Furthermore, an AC power source 22 is connected to the electric heater 8, and a high concentration ozone gas sensor 23 and a low concentration ozone gas sensor 24 are provided between the ozonizer 8 and the dust collecting section 16 and downstream of the ozone killer 17, respectively. It electrically connects the ozone gas sensor and the power supply control section 25, respectively.

Contaminated air containing bad odors and dust is sent from the entrance 2a of the air passage 2 of this air purifier through the screen 3, and a portion of it is supplied to the ozonizer 8, where the oxygen in the air is removed by the creeping discharge of the ozonizer 8. 20 to gasify ozone and convert it into the mostly contaminated air 2b.
It oxidizes and deodorizes the malodorous components present.

At this time, the concentration of ozone in the air 2b is measured by a high concentration ozone gas sensor 23 installed between the ozonizer 8 and the dust collector 16, and if the concentration is below a certain value, the power supply is controlled by the signal at that time. 25 to control the AC power supply 22, and as a result, for example, the operation of the air cleaner is stopped, thereby preventing the air cleaner from being operated in a state where the deodorizing effect is insufficient.

After that, when the dust in the air 2b passes through the ionizer 12, which is connected to the DC high voltage power source 21, it is charged to a negative polarity, and the upstream side is connected to the positive electrode side. Only the air that adheres to the connected mini-pleated filter 14 by electrostatic force and contains residual ozone gas is sent to the ozone killer 17, where the ozone gas is decomposed and becomes oxygen gas, which is then released into the outside air from the outlet 22 by the exhaust fan 26. It is something that is emitted. At this time, the low concentration ozone gas sensor 2 disposed downstream of the ozone killer 17
4. Detect the concentration of ozone gas at that position, and if it is higher than a predetermined value, send the signal to the power supply control unit 25 to stop the operation of this air purifier, and remove ozone gas with a predetermined concentration or higher into the outside air. is prevented from being emitted. Further, the details of the mini-pleated filter 14 mentioned above are explained in the second section.
As shown in the figure, electrodes 15a and 15c are provided by applying conductive paint on the ridge lines on the upstream and downstream sides, or a pair of wire-mesh-shaped breathable electrodes 31 and 32 shown in the fourth part A.
Air permeable sheet filter element 3 sandwiched between
A plurality of synthetic resin strings 34 protruding linearly along the height h direction are bonded 35 to each other between the small folded surfaces 33 formed by bending 0 in a zigzag shape, and the open portions are Space C that competes to form 36.37 in opposite directions alternately
It is a mini pleat type filter made by polymerizing multiple pieces of 1.c2 and 2.c2. enters the space CI+c2 from the open part 36, leaving dust behind, passes through the sheet-like filter element 30 as shown by arrow A30, enters the adjacent space c2, and from there enters the open part 37 in the opposite direction.
The air is then discharged as clean air 2c.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to what is shown in the drawings.
It is also possible to partially change or slightly change the content within the scope of the gist.

The embodiment shown in FIG. 5 is an example of this, in which a screen 3 such as a wire mesh and a plurality of Teflon gas pipes 16 are sequentially installed in an air passage 2 formed in a casing 1 from the upstream direction. 17, and a large number of ejection holes 3 are connected to the gas pipe 38.
9, the ozone gas addition part 40 for uniform dispersion, which is generally planar as a whole, is separated from the space 11 by the discharge electrode 8i! 9 and a counter electrode 10, a mini-pleated filter 14 similar to the above embodiment, and an ozone killer 1.
7 and a suction fan 26 with an electric motor 27.

Further, an outlet 42 of an ozonizer 41 is communicated with the supply section 40 for uniformly dispersing ozone gas, and a pump 44 is connected to the inlet 43 of the ozonizer 41 .
An oxygen or air supply pipe 45 is communicated through the oxygen or air supply pipe 45.

Further, a high concentration ozone sensor 23 is provided in the deodorizing space between the ozone gas uniform distribution supply section 40 and the mini-pleated filter 14, and a low-concentration ozone sensor 24 is provided downstream of the mini-pleated filter 14. Both ozone sensors 23 and 24 are connected to the power supply control unit 25 with electric wires 46 and 47, respectively, and the ozone in the deodorizing space (8 degrees is below a predetermined value, for example, 0.2 ppm or below and deodorization is insufficient, or When the ozone concentration in the discharge passage 2f is higher than a predetermined value, for example 0.05 PPm or higher, the power supply control section 25 is activated by the concentration signals from the ozone sensors 23 and 24 provided at the respective positions, and the high frequency high voltage power supply 18. The current to the motor 27 of the pump 44 and, in some cases, the air fan 26 is cut off to stop their operation, and insufficiently deodorized air or air with an ozone concentration higher than a predetermined value enters the room from the air outlet 2d. This automatically prevents it from being discharged.

In the embodiment shown in FIG. 6, linear corona discharge 8i! 5 and a planar induction electrode 5 are provided,
Also, an ozone gas addition section 28 having an electric heater 7 buried inside the plate-shaped dielectric 4, a discharge electrode and a counter electrode 10.
An ionizer 12, a power supply box 48, a filter element 30 sandwiched between the breathable electrodes 15a and 15b, an ozone killer 17, and an exhaust fan 26 are provided, respectively, and the ozone gas addition section 2
A high concentration ozone gas sensor 23 is installed downstream of the ozone killer 17, and a low concentration ozone gas sensor 24 is installed downstream of the ozone killer 17.
It is made up of the following.

In this embodiment, when the suction fan 26 is rotated, the odor-bearing air 2b enters the air passage 2 from the screen 3, and the air passage 2e narrowed by the ozonizer 8, ionizer, and power supply box 48, and the inclined sm section. 16
It passes through the ozone killer 17 and the exhaust fan 26 and is discharged into the outside air.

Furthermore, even if the mini-pleat filter according to the present invention does not include an upstream electrode and only has a downstream ground electrode, a voltage is naturally generated due to the charge of charged particles. Alternatively, the upstream and downstream electrodes may be left in place and floated by omitting the power supply, or a two-stage electrostatic precipitator consisting of an ionizer and parallel plate electrodes may be used.

The parts in the drawing numerals in FIGS. 5 and 6 that are the same as the drawing numerals in FIGS. 1 to 4 have the same names and functions.

Effects Since the air purifier of the present invention is as described above, ozone gas generated by the ozonizer, which has a linear corona discharge electrode and a planar induction electrode integrally provided through a part of the plate-shaped dielectric, is
It is added to the contaminated air flowing in the air passage to deodorize the air, and also removes fine dust through a mini-pleated filter equipped with an ionizer and breathable pole. The air containing ozone gas remaining inside can be filtered through a layer of ozone killer to make it harmless to the human body before being discharged into the atmosphere.

At this time, in particular, since the heating wire is embedded in the plate-shaped dielectric in this invention, by generating heat in advance, the surface of the plate-shaped dielectric on the linear corona discharge electrode side is kept dry. Even if this air purifier is started in a humid room, a creeping discharge can be immediately generated on the linear corona discharge electrode side of the ozonizer.

As a result, the air purifier can be started with certainty.

The purpose of the pond is to prevent the concentration of ozone gas on the upstream side of Ozone Killer from reaching a predetermined concentration required for deodorization due to some malfunction, or the concentration of ozone gas on the downstream side of Ozone Killer to fall below a predetermined value that is safe for the human body. If the ozone gas is not being released, the entire deodorizing device will automatically stop, and the deodorization of the malodorous gas will be incomplete, or ozone gas exceeding a predetermined concentration will be emitted into the atmosphere, causing damage to the surrounding human body. It will not have any negative impact on the

Furthermore, if a large number of ozone gas ejection holes drilled in a supply section for uniformly dispersing ozone gas are evenly distributed over the entire surface of the supply section, ozone gas can be distributed uniformly over a wide range of air containing malodorous gas components. Not only can the air containing residual ozone gas be ejected, but also the air containing residual ozone gas can be uniformly supplied to the entire surface of the mini-pleated filter, making it possible to remove ozone and dust evenly. Therefore, the frequency of replacing the entire mini-pleated filter can be reduced.

[Brief explanation of drawings]

The attached drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is an enlarged sectional view of a portion of FIG. 1, and FIG.
Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is an enlarged sectional view of a portion of the sectional view taken along the line IV-IV in Fig. 3, and Fig. 5 is a longitudinal sectional view of another embodiment. , FIG. 6 is a longitudinal sectional view of still another embodiment. 1... Gauging 2... Air passage 3... Screen 4... Plate dielectric 5... Linear corona discharge electrode 6... Planar induction electrode 7... Spacing 8... Ozonizer 9...Discharge electrode 10...Counter electrode 11...Space 12...Ionizer 14...Mini pleated filter 15a...Breathable electrode 15b...Breathable electrode 16...Dust collection section 17... Ozone killer 18... High frequency high voltage power supply 20, 21, 22, 23, 24, 25, Creeping discharge DC high voltage power supply DC power supply High concentration sensor Low concentration sensor Exhaust fan

Claims (1)

[Claims] 1. An ozone gas adding section in the air passage sequentially from the upstream side;
and an ozone killer, and the ozone gas addition section is provided with an ozonizer comprising a linear corona discharge electrode and a planar induction electrode through at least a portion of a plate-shaped dielectric, and an electric heater is provided in the plate-shaped dielectric. An air purifier 2 characterized by embedding an ozone gas addition part in the air passage sequentially from its upstream,
A filter part and an ozone killer are provided, and the ozone gas adding part is constituted by an ozonizer having a linear corona discharge electrode and a planar induction electrode provided through at least a part of a plate-shaped dielectric, and An air purifier 3 characterized in that an electric heater is embedded in the sheet electrode at a distance from the planar electrode, and the filter part is formed of a mini-pleated filter sandwiched between a pair of breathable electrodes. The air cleaner 4 according to claim 2, wherein the filter section is constituted by a two-stage electric precipitator consisting of an ionizer and a dust collecting section.
The air purifier 5 described above includes an ozone gas addition section in the air passage sequentially from its upstream,
and an ozone killer, and the ozone gas addition part is connected to the linear corona discharge electrode through at least a portion of a plate-shaped dielectric body that communicates with each of the ozone gas injection holes via the supply pipe. The air purifier 6 is characterized by comprising an ozonizer having a shaped induction electrode and an electric heater embedded in the plate-like dielectric body, and an air supply pump. The air cleaner 7 according to any one of claims 1 to 3, further comprising an ozone gas sensor and a low concentration ozone gas sensor downstream of the ozone killer, wherein the ozonizer and its power source are connected via a timer switch. The air cleaner according to any one of claims 1 to 3.