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JP3933525B2 - Deodorization device - Google Patents

Deodorization device Download PDF

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Publication number
JP3933525B2
JP3933525B2 JP2002157180A JP2002157180A JP3933525B2 JP 3933525 B2 JP3933525 B2 JP 3933525B2 JP 2002157180 A JP2002157180 A JP 2002157180A JP 2002157180 A JP2002157180 A JP 2002157180A JP 3933525 B2 JP3933525 B2 JP 3933525B2
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JP
Japan
Prior art keywords
discharge
ozone
pressure discharge
frequency
discharge means
Prior art date
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JP2002157180A
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Japanese (ja)
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JP2003339839A (en
Inventor
巧 及川
隆雄 服部
大信 岡田
昇 瀬川
尚彦 志村
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Toshiba Corp
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Toshiba Corp
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Publication date
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Priority to JP2002157180A priority Critical patent/JP3933525B2/en
Priority to TW092105195A priority patent/TW589200B/en
Priority to KR1020030017350A priority patent/KR100587616B1/en
Priority to CNB031378838A priority patent/CN100366299C/en
Publication of JP2003339839A publication Critical patent/JP2003339839A/en
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L1/00Cleaning windows
    • A47L1/06Hand implements
    • A47L1/09Hand implements for cleaning one side with access from the other side only
    • A47L1/095Hand implements for cleaning one side with access from the other side only with provision for supplying liquids, e.g. cleaning agents
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L1/00Cleaning windows
    • A47L1/06Hand implements
    • A47L1/15Cloths, sponges, pads, or the like, e.g. containing cleaning agents

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  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Catalysts (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、空気中に含まれている臭気成分や有害物質などを分解して脱臭をおこなう脱臭装置に関する。
【0002】
【従来の技術】
近年、屋外空気や騒音など環境汚染の定常化にともない、住宅の高気密化が進むとともに居住空間内における空気質改善の要望が高まっている。空気質の中でも、タバコの煙の臭いや病人の介護環境などにおける代謝臭気の低減、または住宅建材から発生するVOC(揮発性有機物)に代表される有害ガス成分の除去に対するニーズは特に大きくなっている。
【0003】
これらに要望に対しては、従来より、活性炭に代表される臭い分子を吸着させることによる脱臭、あるいは悪臭成分を他の薬剤成分と反応させて臭気の質を変える方法が採用されてきた。
【0004】
従来技術のうち、吸着剤による脱臭や有害ガス成分の除去については吸着量に限界があり、長期に亙る使用に対しては脱臭フィルタの交換は不可欠となっていた。また、脱臭フィルタは、寿命期間中であっても寿命の末期には吸着した臭い分子が再び放出されることによる臭気発生の問題があった。
【0005】
一方、臭気成分を他の薬剤成分と反応させることで臭気の質を変える方法については、薬剤成分が消耗するため、吸収薬剤を1〜2ヶ月に1回の頻度で交換する必要があり、煩雑であるとともに、薬剤成分の環境中への放出量を室内温度で制御するようにしているため、室温が高いと薬剤成分の放出量が増えることになり、脱臭効果に対する放出量と薬剤成分の寿命との関連制御に難点があった。
【0006】
また、ホルムアルデヒトのような有害ガス成分の分解除去をおこなうには、酸化還元電位の高い触媒反応が必要となるが、オゾンによる酸化分解では完全分解にまで至らず中間分解生成物の段階で止まってしまうため、完全に無害化することは困難であった。
【0007】
そしてまた、酸化チタンに代表される光触媒に紫外線を照射することで活性酸素を発生させ、その強い酸化力で有害ガス成分を完全に分解することは可能であるが、紫外線光源として、管内に水銀が含まれる蛍光管ランプを使用しているため、廃棄時の環境に対する負荷の面から好ましくなかった。
【0008】
【発明が解決しようとする課題】
これらの問題を解決するため、高圧放電によってオゾンや紫外線を発生させ、この紫外線により活性化された光触媒モジュールで空気中に含まれている臭気成分や有害物質などの分解をおこない、高圧放電手段により発生させたオゾンをオゾン分解手段で分解するようにした脱臭装置が提案されている。
【0009】
この脱臭装置は、脱臭性能の制御や有害ガスの完全分解、装置を廃棄する際の環境への負荷などの面で非常に優れているものであるが、高圧放電を用いているために放電周波数に対応した放電音が発生する問題がある。また、高圧放電の条件によっては、ノイズが発生しテレビ受像などに影響する問題もある。
【0010】
放電騒音については、本発明の出願人による特願2001−159477に記載したように、放電周波数を人間の可聴域範囲外とすることで効果を奏するものであるが、50pps以下の可聴域以下の放電周波数では、放電によって得られる紫外線やオゾンの量が周波数に比例して減少するため、脱臭性能が損なわれる問題がある。
【0011】
また、可聴域以上の周波数で放電させると、放電音や脱臭性能上の問題は発生しないが、放電周波数に比例して発生するオゾンは、場合によっては必要以上に多く発生してオゾン分解手段の寿命が短くなる問題を生じ、さらに、可聴域以上である20kpps以上の放電をおこなうと、制御回路の発熱量が大きくなり、別個の冷却装置が必要になる欠点があった。
【0012】
本発明は、上記課題を解決すべくなされたもので、人間の可聴域以上の周波数での放電によって脱臭性能や放電音の問題を解決するとともに、オゾンの発生量を減少してオゾン分解手段の寿命を延長し、制御回路に対する冷却装置を不要とした脱臭装置を提供することを目的とする。
【0013】
【課題を解決するための手段】
上記課題を解決するため、請求項1記載の脱臭装置の発明は、オゾンおよび紫外線を発生させる高圧放電手段と、この高圧放電手段で発生させた紫外線により活性化され空気中に含まれている臭気成分や有害物質などの分解作用をおこなう光触媒モジュールと、前記高圧放電手段により発生させたオゾンを分解するオゾン分解手段とを送風経路中に配置した脱臭装置において、前記高圧放電手段に高電圧を供給する電源回路を前記送風経路の風路断面積中に設置し、高圧放電手段による放電周波数を可聴域以上とするとともに、間欠的に放電することを特徴とするものである。
【0014】
この構成により、放電音の問題を発生させることなく、オゾンの発生量を減少させてオゾン分解手段の寿命を延ばすことができるとともに、回路部の発熱量を抑制して専用の冷却装置を不要としてコストを低減することができる。
【0015】
請求項2記載の発明は、高圧放電手段の放電周波数を20kpps以上とし、その放電を所定時間間隔でオン・オフすることで間欠的におこなうように運転するとともに、前記放電を間欠的におこなう運転のオン・オフ周波数を50Hz以下若しくは20kHz以上としたことを特徴とするものであり、放電周波数が可聴域の範囲外であっても、間欠運転の周波数が可聴域内であることによる騒音の発生問題をなくすことができる。
【0016】
請求項3記載の発明は、臭気センサーの検出値に応答して高圧放電手段の間欠的な運転制御を変更するようにしたことを特徴としており、臭気が比較的少ないときにはオゾン発生量や回路の発熱量を低減することができる。
【0017】
【発明の実施の形態】
以下、図面に基づき本発明の1実施形態について説明する。図1は本発明に係る脱臭装置(1)の縦断面図であり、冷蔵庫の冷気ダクトや空気調和装置における空気ダクトなどのダクト部材(2)によって形成された風路(3)中に送風ファン(4)を配置し、その風上側に光触媒モジュール(5)を設けるとともに、光触媒モジュール(5)と送風ファン(4)との間にはオゾン分解触媒フィルタ(10)を配設している。
【0018】
光触媒モジュール(5)は、アルミナやシリカなどの多孔質セラミックからなる基体の表面に、酸化チタンに代表される光触媒材料を塗布して乾燥あるいは焼結することで固着した光触媒フィルタ(6)(7)を2枚隣設し、この光触媒フィルタ間にはステンレスなどの薄板をエッチングして網目状に形成した放電電極(8)を立設するとともに、前記2枚の光触媒フィルタ(6)(7)の風路(3)における風上と風下側には前記放電電極(8)と同様に形成した対極(9)をそれぞれ配置して構成している。
【0019】
なお、前記光触媒モジュール(5)における光触媒フィルタは、必ずしも2枚隣設せずとも、冷蔵庫の冷蔵室から野菜室への冷気通路中に設けた脱臭装置のように、臭気成分やエチレン浮遊菌が比較的少ない場合には、1枚の光触媒フィルタの前後に対極(9)と放電電極(8)を設ける構成でもよい。
【0020】
(11)は電源回路であり、高電圧発生トランス(12)により前記放電電極(8)と各対極(9)との間に正のパルス状直流高電圧を印加する。
【0021】
前記放電電極(8)の網目の大きさは、対極(9)の網目の大きさよりも大きく形成されている。この構成により、放電電極(8)と対極(9)は紫外線発生用の放電手段として機能し、双方の電極間に放電が起きて波長が380nm以下である紫外線が発生する。
【0022】
また、この放電電極(8)と対極(9)が放電すると、紫外線とともにオゾンが発生するため、前記光触媒モジュール(5)は紫外線による活性酸素の発生で有害ガス成分を完全に分解させる機能とともに、オゾン発生手段としても機能するものであり、この光触媒モジュール(5)から風下側には所定距離を空けて設置したオゾンを吸収するオゾン分解触媒フィルタ(10)は、2酸化マンガンを主成分としたハニカム形状の焼結体から形成されている。
【0023】
上記構成の脱臭装置(1)を動作させる場合には以下のようにおこなう。すなわち、電源回路(11)に通電し、送風ファン(4)を駆動するとともに、放電電極(8)と対極(9)との間に電圧を与えると、電極間に放電が起き紫外線が発生する。
【0024】
紫外線が光触媒フィルタ(6)(7)に照射されることにより、光触媒を活性化させて発生した活性酸素が風路(3)を流下し、水酸化ラジカル(遊離基)の強い酸化作用で、光触媒フィルタ(6)(7)の表面に付着した臭気ガス成分や有機化合物の結合を分解し、無臭化若しくは低臭気化することで脱臭する。
【0025】
また、菌の菌細胞膜を脆化させ抗菌をおこなうとともに、酸化分解作用によって光触媒フィルタ(6)(7)表面の微生物の繁殖を抑制して、脱臭装置(1)や風路(3)壁表面の汚れを分解除去する。
【0026】
そして、上記構成を前提とした本発明の1実施例に対する比較例として、上記動作において、放電電極(8)と対極(9)との間に、ピーク電圧が4kVで、人間の可聴域以上の放電周波数である20kpps(キロパルス/秒)の電圧を与えて連続運転をおこなった。
【0027】
この場合、図2に示すピーク電圧が4kVの放電周波数と騒音レベルとの関係グラフから理解されるように、放電周波数が20kppsの場合に発生する放電音は人間の可聴域以上であり、人が音として感じない範囲であるため、装置としての騒音値は17.6dbと闇騒音(15.4db)に近い低い値であり問題なかった。
【0028】
しかしながら、排出されたオゾンは1.1ppmと作業環境基準である0.5ppmを上回っており、高電圧を供給する電源回路(11)上の抵抗表面温度も150℃ときわめて高温度となった。通常、抵抗表面温度は、70〜80℃を越えると回路寿命が極端に短くなるものであり、本比較例の場合、回路寿命を維持するためには冷却装置を要する状態であったため、以下の実施例による検討をおこない対応した。
【0029】
(実施例1)
本発明の1実施例の脱臭装置として、図1と同一の構成とし、放電電極(8)と対極(9)との間に、ピーク電圧が4kVで、20kppsの電圧を与えるとともに、放電のオン・オフ間隔を所定時間間隔、例えば、オン時間を0.01秒、オフ時間を0.09秒として間欠的に運転するようにした。
【0030】
この間欠的に運転した時の1秒当たりのオンオフ回数である運転周波数は、50Hz以下若しくは20kHz以上の可聴域外にすることによって、放電時の周波数が可聴域の範囲外であっても、間欠的な運転の周波数が可聴域内であることによる騒音の発生問題をなくすようにしている。
【0031】
その結果、騒音値は17.6dbと前記比較例と同じ値で低く変化はなかったが、排出オゾンは0.09ppmと作業環境基準を大きく下回る値となり、高電圧回路(11)上の抵抗表面温度も38℃と回路寿命上冷却の必要のないレベルであった。
【0032】
(実施例2)
実施例1と基本構成を同一とするとともに、高電圧を供給する電源回路(11)を風路(3)上に設置した。このときの騒音値は17.6dbであり、排出オゾンは0.09ppmと実施例1の値と同一であるとともに、高電圧回路(11)上の抵抗表面温度は32℃と実施例1より低い問題のないレベルであった。
【0033】
通常、前記高電圧回路(11)上における抵抗などの発熱部には冷却ファンなどの放熱装置を設ける必要があるが、本実施例による脱臭装置の運転中には、ファンの回転によって風路には常に風の流れを生じているとともに間欠的に放電していることから、この風路(3)断面積中の一部に高電圧回路(11)を設置することで回路の発熱時にはこれに同期して強制的に送風冷却されることになり、別個の放熱装置などを必要とせずに発熱部を冷却して放熱することができる。
【0034】
(実施例3)
実施例1と基本的に同構成とするとともに、同一部分を同一符号で示す図3に示すように、高電圧発生トランス(12)を含む電源回路(11)を風路(3)上の光触媒モジュール(5)の上流側であるA、およびオゾン分解触媒フィルタ(10)の下流側で送風ファン(4)との間のBに示す位置に設置し比較検討した。また同時に、屎尿臭を発生するアンモニアを用いて10時間の脱臭耐久比較試験をおこない外観を調査した。
【0035】
結果は、図4の表に示すとおりであり、高電圧トランス(12)上の抵抗表面温度はA,B位置とも55℃と同一温度で低く問題のないレベルであったが、光触媒モジュール(5)の上流側であるA位置に設置したものはアンモニアの影響を受け、トランス(5)の金属部分に錆発生が認められた。これに対し、風下側のB位置については、光触媒による酸化分解作用を受けた清浄な空気によって冷却することができ、高電圧トランス(5)を臭気物質による汚染から保護することができた。
【0036】
(実施例4)
図示しないが、臭気物質に触れると抵抗変化によりこれを検知する感応材料として酸化スズを使用した熱線型半導体センサーなどの臭気センサーを脱臭装置に設け、放電周波数を20kppsとして、放電のオフ時間を0.05秒、オン時間を臭気センサーからの信号に比例して0.01〜0.09秒の間で変化するように回路を構成した。このときの騒音レベルは16.8〜17.8dbと低く、オゾン発生量は作業環境基準の0.5ppm以下の0.13〜0.23ppmとすることができ、実用上問題のないレベルであった。
【0037】
【発明の効果】
以上説明したごとく本発明の構成によれば、放電周波数を人間の可聴域以上として間欠的に放電することにより、放電音の問題を発生させることなく、オゾンの発生量を減少させてオゾン分解手段の寿命を延ばすことができるとともに、回路部の発熱量を抑制して専用の冷却装置を不要としてコストを低減することができる。
【図面の簡単な説明】
【図1】本発明の実施例1における脱臭装置の概略縦断面図である。
【図2】図1の装置による騒音と放電周波数との関係を示すグラフである。
【図3】本発明の実施例3の脱臭装置を示す縦断面図である。
【図4】実施例3における実験結果を示す表である。
【符号の説明】
1…脱臭装置 2…ダクト部材 3…風路
4…送風ファン 5…光触媒モジュール 6、7…光触媒フィルタ
8…放電電極 9…対極 10…オゾン分解触媒フィルタ
11…電源回路 12…トランス
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a deodorizing apparatus for deodorizing by decomposing odor components and harmful substances contained in the air.
[0002]
[Prior art]
In recent years, along with the steady environmental pollution such as outdoor air and noise, the demand for air quality improvement in the living space has increased along with the progress of airtightness of houses. Of the air quality, the need for reduction of metabolic odor in cigarette smoke odor and care environment for sick people, or removal of harmful gas components typified by VOC (volatile organic substances) generated from residential building materials has become particularly large. Yes.
[0003]
To meet these demands, conventionally, a deodorization method by adsorbing odor molecules represented by activated carbon, or a method of changing the odor quality by reacting a malodorous component with other drug components has been adopted.
[0004]
Among the prior arts, the amount of adsorption is limited for deodorization and removal of harmful gas components by an adsorbent, and replacement of the deodorization filter has become indispensable for long-term use. Further, the deodorizing filter has a problem of generating odor due to the adsorbed odor molecules being released again at the end of the lifetime even during the lifetime.
[0005]
On the other hand, the method of changing the odor quality by reacting the odor component with another drug component consumes the drug component, so it is necessary to replace the absorbed drug once every one to two months, which is complicated. In addition, since the release amount of the drug component into the environment is controlled at room temperature, the release amount of the drug component increases when the room temperature is high, and the release amount against the deodorizing effect and the life of the drug component There was a difficulty in the related control.
[0006]
In addition, in order to decompose and remove harmful gas components such as formaldehyde, a catalytic reaction with a high oxidation-reduction potential is required, but oxidative decomposition with ozone does not lead to complete decomposition, but stops at the intermediate decomposition product stage. Therefore, it has been difficult to completely detoxify.
[0007]
Moreover, it is possible to generate active oxygen by irradiating a photocatalyst represented by titanium oxide with ultraviolet rays, and to completely decompose harmful gas components with its strong oxidizing power. Is not preferable from the viewpoint of environmental load at the time of disposal.
[0008]
[Problems to be solved by the invention]
In order to solve these problems, ozone and ultraviolet rays are generated by high-pressure discharge, and the photocatalyst module activated by the ultraviolet rays is used to decompose odor components and harmful substances contained in the air. There has been proposed a deodorizing apparatus in which generated ozone is decomposed by an ozonolysis means.
[0009]
This deodorization device is very excellent in terms of control of deodorization performance, complete decomposition of harmful gases, and environmental load when the device is discarded. There is a problem that a discharge sound corresponding to is generated. Further, depending on the conditions of high-voltage discharge, there is a problem that noise is generated and affects television reception.
[0010]
About discharge noise, as described in Japanese Patent Application No. 2001-159477 by the applicant of the present invention, it is effective to make the discharge frequency outside the human audible range, but it is less than 50 pps audible range. At the discharge frequency, the amount of ultraviolet light and ozone obtained by the discharge decreases in proportion to the frequency, and there is a problem that the deodorizing performance is impaired.
[0011]
In addition, when discharging at a frequency higher than the audible range, there will be no problems with the discharge sound or deodorizing performance, but in some cases, ozone generated in proportion to the discharge frequency is generated more than necessary, and the ozone decomposition means When the discharge of 20 kpps or more, which is higher than the audible range, is caused, the life of the control circuit is increased and the amount of heat generated by the control circuit increases, and a separate cooling device is required.
[0012]
The present invention has been made to solve the above problems, and solves the problems of deodorization performance and discharge sound by discharging at a frequency higher than the human audible range, and reduces the amount of ozone generated to reduce the ozone generation means. An object of the present invention is to provide a deodorizing device that extends the life and eliminates the need for a cooling device for a control circuit.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the deodorizing apparatus according to claim 1 includes high-pressure discharge means for generating ozone and ultraviolet light, and odor activated by the ultraviolet light generated by the high-pressure discharge means and contained in the air. Supplying high voltage to the high- pressure discharge means in a deodorizing device in which a photocatalyst module that decomposes components and harmful substances, etc., and an ozone decomposition means that decomposes ozone generated by the high-pressure discharge means are arranged in the air passage. The power supply circuit is installed in the air passage cross-sectional area of the blower passage so that the discharge frequency by the high-pressure discharge means is higher than the audible range and is discharged intermittently.
[0014]
With this configuration, it is possible to extend the life of the ozone decomposition means by reducing the amount of ozone generated without causing the problem of discharge noise, while suppressing the amount of heat generated in the circuit section and eliminating the need for a dedicated cooling device Cost can be reduced.
[0015]
According to a second aspect of the invention, the discharge frequency of the high-pressure discharge means and above 20Kpps, while operating as intermittently performed by turning on and off the discharge at predetermined time intervals, intermittently performing the discharge operation The on / off frequency is 50 Hz or less or 20 kHz or more, and even if the discharge frequency is outside the audible range, the problem of noise generation due to the intermittent operation frequency being within the audible range Can be eliminated.
[0016]
According to a third aspect of the invention, in response to the detection value of the odor sensor are characterized in that so as to change the intermittent operation control of the high-pressure discharge means, odor of ozone generation amount and the circuit when relatively small The calorific value can be reduced.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a deodorizing apparatus (1) according to the present invention, and a blower fan is provided in an air passage (3) formed by a duct member (2) such as a cold air duct of a refrigerator or an air duct in an air conditioner. (4) is disposed, a photocatalyst module (5) is provided on the windward side, and an ozone decomposition catalyst filter (10) is disposed between the photocatalyst module (5) and the blower fan (4).
[0018]
The photocatalyst module (5) is a photocatalyst filter (6) (7) fixed by applying a photocatalyst material typified by titanium oxide on the surface of a substrate made of a porous ceramic such as alumina or silica and drying or sintering. ) Are placed next to each other, and a discharge electrode (8) formed by etching a thin plate of stainless steel or the like into a mesh shape is erected between the photocatalytic filters, and the two photocatalytic filters (6) (7) The counter electrode (9) formed in the same manner as the discharge electrode (8) is arranged on the windward and leeward sides of the air passage (3).
[0019]
The photocatalyst filter in the photocatalyst module (5) does not necessarily have two adjacent ones, but odorous components and ethylene-floating bacteria are present in a deodorizing device provided in the cold passage from the refrigerator compartment to the vegetable compartment. In the case where the number is relatively small, the counter electrode (9) and the discharge electrode (8) may be provided before and after one photocatalytic filter.
[0020]
(11) is a power supply circuit, and a positive pulsed DC high voltage is applied between the discharge electrode (8) and each counter electrode (9) by a high voltage generating transformer (12).
[0021]
The mesh size of the discharge electrode (8) is larger than the mesh size of the counter electrode (9). With this configuration, the discharge electrode (8) and the counter electrode (9) function as a discharge means for generating ultraviolet rays, and discharge occurs between both electrodes to generate ultraviolet rays having a wavelength of 380 nm or less.
[0022]
Further, when the discharge electrode (8) and the counter electrode (9) are discharged, ozone is generated together with ultraviolet rays. Therefore, the photocatalyst module (5) has a function of completely decomposing harmful gas components by generation of active oxygen due to ultraviolet rays, The ozone decomposing catalyst filter (10) that absorbs ozone installed at a predetermined distance from the photocatalyst module (5) to the leeward side of the photocatalyst module (5) is mainly composed of manganese dioxide. It is formed from a honeycomb-shaped sintered body.
[0023]
When operating the deodorizing apparatus (1) of the said structure, it carries out as follows. That is, when the power supply circuit (11) is energized to drive the blower fan (4) and a voltage is applied between the discharge electrode (8) and the counter electrode (9), discharge occurs between the electrodes and ultraviolet rays are generated. .
[0024]
By irradiating the photocatalyst filters (6) and (7) with ultraviolet rays, the active oxygen generated by activating the photocatalyst flows down the air passage (3), and a strong oxidizing action of hydroxyl radicals (free radicals) Deodorization is achieved by decomposing bonds of odorous gas components and organic compounds adhering to the surfaces of the photocatalytic filters (6) and (7) and making them odorless or reducing odor.
[0025]
In addition, the cell membrane of the fungus is embrittled and antibacterial, and the growth of microorganisms on the surface of the photocatalytic filter (6) and (7) is suppressed by oxidative degradation, so that the deodorization device (1) and air passage (3) wall surface Dissolve and remove dirt.
[0026]
As a comparative example for one embodiment of the present invention based on the above configuration, in the above operation, the peak voltage is 4 kV between the discharge electrode (8) and the counter electrode (9), which is higher than the human audible range. A continuous operation was performed by applying a voltage of 20 kpps (kilopulses / second) as the discharge frequency.
[0027]
In this case, as understood from the graph of the relationship between the discharge frequency and the noise level with the peak voltage of 4 kV shown in FIG. 2, the discharge sound generated when the discharge frequency is 20 kpps is above the human audible range, Since it was in the range where it was not felt as a sound, the noise value as a device was 17.6 db, a low value close to dark noise (15.4 db), and there was no problem.
[0028]
However, the discharged ozone was 1.1 ppm, exceeding the working environment standard of 0.5 ppm, and the resistance surface temperature on the power supply circuit (11) for supplying a high voltage was as high as 150 ° C. Usually, when the resistance surface temperature exceeds 70 to 80 ° C., the circuit life is extremely shortened. In this comparative example, a cooling device is required to maintain the circuit life. A study based on the example was performed.
[0029]
Example 1
As deodorizing apparatus of one embodiment of the present invention, the same configuration as FIG. 1, between the discharge electrode (8) and the counter electrode (9), the peak voltage is 4 kV, with providing a voltage of 20Kpps, discharge ON off interval for a predetermined time interval, for example, the on-time of 0.01 seconds, so as to intermittently drive the oFF time as 0.09 seconds.
[0030]
Frequency of operation is off number of times per second when operating in the intermittent is by below or 20kHz or more outside the audible range 50 Hz, also the frequency during discharge be outside the range of the audible range, intermittent The problem of noise generation due to the fact that the frequency during typical driving is within the audible range is eliminated.
[0031]
As a result, the noise value was 17.6 db, which was the same value as in the comparative example, but did not change. However, the exhausted ozone was 0.09 ppm, a value significantly below the working environment standard, and the resistance surface on the high voltage circuit (11) The temperature was 38 ° C., which was a level that did not require cooling for the circuit life.
[0032]
(Example 2)
A power supply circuit (11) for supplying a high voltage was installed on the air passage (3) while having the same basic configuration as that of Example 1. The noise value at this time is 17.6 db, the discharged ozone is 0.09 ppm, which is the same as the value in Example 1, and the resistance surface temperature on the high voltage circuit (11) is 32 ° C., which is lower than that in Example 1. There was no problem level.
[0033]
Usually, it is necessary to provide a heat radiating device such as a cooling fan in the heat generating part such as a resistor on the high voltage circuit (11). However, during the operation of the deodorizing device according to this embodiment, the fan is rotated to the air path. Since the wind always generates and intermittently discharges, install a high-voltage circuit (11) in a part of the cross-sectional area of the air path (3) to generate heat when the circuit generates heat. The air is forcedly cooled synchronously, and the heat generating portion can be cooled and radiated without the need for a separate heat radiating device.
[0034]
(Example 3)
The power supply circuit (11) including the high voltage generation transformer (12) is a photocatalyst on the air passage (3) as shown in FIG. It installed in the position shown to B between the ventilation fan (4) on the downstream side of A and the ozone decomposition | disassembly catalyst filter (10) upstream of a module (5), and compared. At the same time, a 10-hour deodorization durability comparison test was performed using ammonia that generates a manure odor, and the appearance was investigated.
[0035]
The results are as shown in the table of FIG. 4. The resistance surface temperature on the high voltage transformer (12) was the same temperature at 55 ° C. at both the A and B positions, which was low and no problem, but the photocatalytic module (5 ), Which was installed at position A, which is upstream of), was affected by ammonia, and rusting was observed in the metal part of the transformer (5). On the other hand, the B position on the leeward side could be cooled by clean air subjected to the oxidative decomposition action by the photocatalyst, and the high voltage transformer (5) could be protected from contamination by odorous substances.
[0036]
Example 4
Although not shown, an odor sensor such as a hot-wire semiconductor sensor using tin oxide as a sensitive material that detects a change in resistance when a odor substance is touched is provided in the deodorizer, the discharge frequency is 20 kpps, and the discharge off time is 0. The circuit was configured to change the on time between 0.01 and 0.09 seconds in proportion to the signal from the odor sensor for .05 seconds. The noise level at this time is as low as 16.8 to 17.8 db, and the amount of ozone generated can be set to 0.13 to 0.23 ppm, which is 0.5 ppm or less of the working environment standard. It was.
[0037]
【The invention's effect】
As described above, according to the configuration of the present invention, the ozone generation means is reduced by causing the discharge frequency to be intermittently discharged above the human audible range, thereby reducing the amount of ozone generated without causing the problem of discharge noise. In addition to extending the service life, the amount of heat generated in the circuit portion can be suppressed, and a dedicated cooling device is not required, thereby reducing the cost.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a deodorizing apparatus in Embodiment 1 of the present invention.
FIG. 2 is a graph showing the relationship between noise and discharge frequency by the apparatus of FIG.
FIG. 3 is a longitudinal sectional view showing a deodorizing apparatus according to Embodiment 3 of the present invention.
4 is a table showing experimental results in Example 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Deodorizing device 2 ... Duct member 3 ... Air path 4 ... Blower fan 5 ... Photocatalyst module 6, 7 ... Photocatalyst filter 8 ... Discharge electrode 9 ... Counter electrode 10 ... Ozone decomposition catalyst filter
11 ... Power circuit 12 ... Transformer

Claims (3)

オゾンおよび紫外線を発生させる高圧放電手段と、この高圧放電手段で発生させた紫外線により活性化され空気中に含まれている臭気成分や有害物質などの分解作用をおこなう光触媒モジュールと、前記高圧放電手段により発生させたオゾンを分解するオゾン分解手段とを送風経路中に配置した脱臭装置において、前記高圧放電手段に高電圧を供給する電源回路を前記送風経路の風路断面積中に設置し、高圧放電手段による放電周波数を可聴域以上とするとともに、間欠的に放電することを特徴とする脱臭装置。High-pressure discharge means for generating ozone and ultraviolet light, a photocatalyst module that is activated by ultraviolet light generated by the high-pressure discharge means and decomposes odorous components and harmful substances contained in the air, and the high-pressure discharge means In the deodorizing device in which the ozone decomposing means for decomposing ozone generated by the air is disposed in the air passage, a power supply circuit for supplying a high voltage to the high- pressure discharge means is installed in the air passage cross-sectional area of the air passage. A deodorizing apparatus characterized in that the discharge frequency by the discharging means is set to be higher than the audible range and is discharged intermittently. 高圧放電手段の放電周波数を20kpps以上とし、その放電を所定時間間隔でオン・オフすることで間欠的におこなうように運転するとともに、前記放電を間欠的におこなう運転のオン・オフ周波数を50Hz以下若しくは20kHz以上としたことを特徴とする請求項1記載の脱臭装置。The discharge frequency of the high-pressure discharge means is set to 20 kpps or more, and the discharge is operated to be intermittently performed by turning on / off at predetermined time intervals, and the on / off frequency of the operation to intermittently perform the discharge is 50 Hz or less. Or it is 20 kHz or more, The deodorizing apparatus of Claim 1 characterized by the above-mentioned. 臭気センサーの検出値に応答して高圧放電手段の間欠的な運転制御を変更するようにしたことを特徴とする請求項1または2記載の脱臭装置。In response to the detection value of the odor sensor deodorizing apparatus according to claim 1, wherein it has to change the intermittent operation control of the high-pressure discharge means.
JP2002157180A 2002-05-30 2002-05-30 Deodorization device Expired - Lifetime JP3933525B2 (en)

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KR1020030017350A KR100587616B1 (en) 2002-05-30 2003-03-20 A deodorizing apparatus
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JP4887725B2 (en) * 2005-10-19 2012-02-29 パナソニック株式会社 Deodorization device
JP4613813B2 (en) * 2005-12-21 2011-01-19 東芝ホームテクノ株式会社 Catalyst deodorizer
JP4607844B2 (en) * 2006-10-11 2011-01-05 株式会社東芝 refrigerator
JP2010038533A (en) * 2008-07-08 2010-02-18 Panasonic Corp Food storage
JP2010156530A (en) * 2008-07-08 2010-07-15 Panasonic Corp Food storage
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CN101401947A (en) * 2008-11-05 2009-04-08 黄永卫 Air cleaning apparatus for refrigerated container
CN102688513B (en) * 2011-03-24 2014-03-12 清华大学 Harmful substance removal device and air purification device adopting harmful substance removal device
US9165756B2 (en) * 2011-06-08 2015-10-20 Xenex Disinfection Services, Llc Ultraviolet discharge lamp apparatuses with one or more reflectors
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