JPS61257252A - Air conditioner - Google Patents
Air conditionerInfo
- Publication number
- JPS61257252A JPS61257252A JP60098889A JP9888985A JPS61257252A JP S61257252 A JPS61257252 A JP S61257252A JP 60098889 A JP60098889 A JP 60098889A JP 9888985 A JP9888985 A JP 9888985A JP S61257252 A JPS61257252 A JP S61257252A
- Authority
- JP
- Japan
- Prior art keywords
- main body
- air
- air conditioner
- dust collection
- dust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
- Electrostatic Separation (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野〉
本発明は集塵機能を備えた空調機に関し、特に電位差を
利用して風を起こしつつ集塵する方式の空調機に関する
。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air conditioner equipped with a dust collection function, and particularly to an air conditioner that collects dust while generating wind using a potential difference.
(従来の技術)
一般に、空調機と集塵機は別個に市販されており・、そ
れぞれに送風用ファン、駆動用モータ、或いは集塵用フ
ィルター等を備えているが、例えば業務用として一部の
空調機に見られるように、空調機の吸込部分に集塵機を
装着して両者を一体化したものもある。この場合には、
集塵機がその厚さ分だけ空調機本体前面に突出するか或
いは空調機本体全体の厚さが大きくなってしまい、機器
の小型化という近年の趨勢に適わないとともに、意匠性
にも劣ってしまう。また、集塵機としてフィルタ一式の
ものを用いると、フィルターの集塵量に比例して通風抵
抗が増加するので、このものでは空調機としての性能維
持を図るに不利でもある。(Prior art) Generally, air conditioners and dust collectors are commercially available separately, and each is equipped with a blower fan, a drive motor, a dust collection filter, etc. However, for example, some air conditioners for commercial use Some air conditioners have a dust collector attached to the suction part of the air conditioner, integrating the two, as seen in the Air Conditioner. In this case,
The dust collector protrudes from the front of the air conditioner body by the thickness thereof, or the thickness of the entire air conditioner body becomes large, which does not meet the recent trend of miniaturization of equipment and is inferior in design. Furthermore, if a set of filters is used as a dust collector, the ventilation resistance increases in proportion to the amount of dust collected by the filter, which is disadvantageous in maintaining the performance of the air conditioner.
そこで本発明者は、集塵方式として通風抵抗の極めて少
ない電気式のものを既に提案している(特願昭59−1
04757号参照)、即ち、1対の陰極板と陽極体とに
高電圧を印加して空気中の塵をプラスに帯電し、これに
より該塵を陰極板に付着させ集塵する方式のものである
。Therefore, the present inventor has already proposed an electric dust collection system with extremely low ventilation resistance (Japanese Patent Application No. 59-1
04757), that is, a high voltage is applied to a pair of cathode plates and an anode body to positively charge dust in the air, thereby causing the dust to adhere to the cathode plate and collect the dust. be.
〈発明が解決しようとする問題点)
ところで、帯電部としての陽極体から集塵部としての陰
極板の下流側端までの距離(以下、助走距離という)は
、通常最低でも50〜60mm必要であり、高い集塵効
率を得ようとすれば100mm程度は必要である。従っ
て、かかる電気式の集塵装置を空調機本体前面に装着す
ると、本体の厚みが増してスペース的に不利であるとと
もに、意匠性にも劣る。(Problems to be Solved by the Invention) By the way, the distance from the anode body as the charging part to the downstream end of the cathode plate as the dust collection part (hereinafter referred to as run-up distance) usually needs to be at least 50 to 60 mm. If you want to obtain high dust collection efficiency, about 100 mm is necessary. Therefore, when such an electric dust collector is attached to the front of the air conditioner main body, the thickness of the main body increases, which is disadvantageous in terms of space, and the design is also poor.
本発明はこのような従来の実情に着目してなされたもの
で、空調機本体の厚みを増やすことなく前記助走距離を
確保した上記電気式の集塵装置を空調機に一体化し、こ
れにより集塵効率の高い空調機を本体の大型化を回避し
つつ提供するとともに、特に前方からの見栄えの良い意
匠性にも優れた空調機を提供する。The present invention has been made in view of the above-mentioned conventional situation, and it integrates the above-mentioned electric dust collector into an air conditioner, which secures the run-up distance without increasing the thickness of the air conditioner body, and thereby improves the dust collection. To provide an air conditioner with high dust efficiency while avoiding increasing the size of the main body, and also to provide an air conditioner with excellent design that looks good especially from the front.
く問題点を解決するための手段及びその作用〉このため
、本発明は、陽極体と陰極板とを結ぶ空気流通方向に対
して略平行となる空気通路の熱交換器より上流側の該通
路部分を、空調機本体の前面と略平行に形成する構成と
した。Means for Solving the Problems and Their Effects> For this reason, the present invention provides an air passageway upstream of a heat exchanger that is substantially parallel to the air flow direction connecting the anode body and the cathode plate. The part is formed approximately parallel to the front surface of the air conditioner main body.
これにより、前記助走距離を充分に確保できるので、本
体の厚みを増やす等の大型化をしなくても高い集塵効率
を得ることができるとともに、余分な厚みが不要なため
に本体前面が出っ張ることもなく、見栄えの良い空調機
とできる。As a result, a sufficient run-up distance can be secured, so high dust collection efficiency can be obtained without increasing the thickness of the main body or making it larger, and since no extra thickness is required, the front of the main body protrudes. You can create a good-looking air conditioner without any problems.
〈実施例〉
以下、本発明の実施例を図面に基づいて詳細に説明する
。<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.
室内の壁面等に取付けられる薄型の空調機本体1は、本
体1内の空気流れが例えば第1図に矢印で示すように大
路上側から下側に向けて流れるように空気通路2を形成
している。即ち、本体1上側壁に吸入口(空気入口)2
aを開設する一方、前壁下部に吐出口(空気出口)2b
を開設して本体1の上下長手方向と大略平行に空気通路
2を形成し、前記吸入口2aを介して流入する空気を、
断熱部材3により仕切られて本体枠IA内に形成される
空間に配設される熱交換器としての熱交換用コイル4及
び送風用ファン5を経て吐出口2bから吐出する構成で
ある。A thin air conditioner main body 1 that is attached to a wall or the like in a room has an air passage 2 formed so that the air inside the main body 1 flows from the upper side to the lower side as shown by the arrow in FIG. 1, for example. ing. That is, an inlet (air inlet) 2 is provided on the upper wall of the main body 1.
a, and a discharge port (air outlet) 2b at the bottom of the front wall.
is opened to form an air passage 2 approximately parallel to the vertical longitudinal direction of the main body 1, and the air flowing in through the suction port 2a is
The configuration is such that the air is discharged from the outlet 2b through a heat exchange coil 4 as a heat exchanger and a blower fan 5, which are disposed in a space partitioned by a heat insulating member 3 and formed within the main body frame IA.
ここで、前記本体枠IAは前面が開放される箱体で、そ
の前面はフェイス6 (6a、6b)によって覆われて
いる。該フェイス6は、後述する1対の陰極板と陽極体
とを内側に備えるとともに上部空間(本体1の上側壁)
に前記吸入口2aを形成し、空気通路2の入口部として
も機能して本体1前面の上部に着脱自由に装着されるフ
ェイス構成部材6aと、本体1前面を覆い下部に吐出口
2bを開設して、前記コイル4との間に所定幅の空隙を
隔てて本体枠IAに装着されるフェイス構成部材6bと
からなる。かかるフェイス構成部材6bとコイル4との
前記空隙は、前記フェイス構成部材6aが形成する空気
通路2と大略同じ幅に形成され、同様に空気通路2・と
じて機能する。Here, the main body frame IA is a box with an open front, and the front is covered by a face 6 (6a, 6b). The face 6 includes a pair of cathode plates and an anode body, which will be described later, inside and has an upper space (an upper wall of the main body 1).
The intake port 2a is formed in the air passage 2, a face component member 6a is provided which also functions as an inlet of the air passage 2, and is detachably attached to the upper part of the front surface of the main body 1, and a discharge port 2b is provided at the lower part of the front surface of the main body 1. and a face component 6b that is attached to the main body frame IA with a gap of a predetermined width between it and the coil 4. The gap between the face component 6b and the coil 4 is formed to have approximately the same width as the air passage 2 formed by the face component 6a, and similarly functions as the air passage 2.
尚、前記コイル4は、その配設方向を図示の如く多少傾
斜させて設置されている。これにより、特に熱交換器の
厚み方向の幅を小さくしている。Incidentally, the coil 4 is installed with its direction of arrangement being somewhat inclined as shown in the figure. This makes the width of the heat exchanger particularly small in the thickness direction.
更に、前記フェイス構成部材6aに介装される集塵ユニ
ットについて第2図をも参照して詳述する。フェイス構
成部材6aには、空気通路2壁に平行に相対向する1対
の陰極板7と、該相対向する陰極板7との間に対同極板
8と、前記陰極板7より吸入口2a側に空気中の粉塵を
陽イオン化するイオン化線(陽極体)9と、が配設され
ている。Further, the dust collection unit installed in the face component 6a will be described in detail with reference to FIG. 2 as well. The face component 6a includes a pair of cathode plates 7 that face each other in parallel with the wall of the air passage 2, a counter-same electrode plate 8 between the opposing cathode plates 7, and an inlet from the cathode plate 7. An ionization wire (anode body) 9 for positively ionizing dust in the air is disposed on the side 2a.
また、第1図に示すように、本体枠IA内に交流電源か
ら直流高電圧を発生して前記陰極板7とイオン化線9と
の間に印加する高電圧印加手段としてのトランス10が
設けられ、該トランス10.陰極板7.対向陰極8及び
イオン化線9とによって集塵ユニットを構成する。Further, as shown in FIG. 1, a transformer 10 as a high voltage applying means for generating a DC high voltage from an AC power source and applying it between the cathode plate 7 and the ionization wire 9 is provided in the main body frame IA. , the transformer 10. Cathode plate7. The counter cathode 8 and the ionization line 9 constitute a dust collection unit.
次に、作用を説明する。Next, the effect will be explained.
いま、例えば陰極板7の電圧を一7kV、イオン化線9
の電圧を+13kVにそれぞれ荷電し、対向陰極8を接
地(Ov)すると、イオン化線9の周囲は陰極板7との
電位差20kVでプラズマ状になり、陰イオンはイオン
化線9に衝突吸収され、陽イオンは1対の陰極1Ii7
間を直進する。このとき、空気の粘性により、周りの空
気を一緒に引っ張り、イオン化線9から1対の陰極板7
に対する合成ベクトルの方向の風となる。即ち、矢印(
第1図)のように空調機本体lの上側壁から空気を本体
1内に吸入される方向の風となる。尚、このとき送風用
ファン5をオンとして集塵ユニットと併用すれば、さら
に通風量が増大することは勿論である。Now, for example, the voltage of the cathode plate 7 is -7 kV, and the ionization line 9 is
When the counter cathode 8 is grounded (Ov), the area around the ionized wire 9 becomes plasma with a potential difference of 20 kV with the cathode plate 7, and the anions are collided and absorbed by the ionized wire 9, and the positive Ions are connected to a pair of cathodes 1Ii7
Go straight between. At this time, due to the viscosity of the air, the surrounding air is pulled together, and the pair of cathode plates 7 are pulled from the ionization wire 9.
becomes the wind in the direction of the resultant vector. That is, the arrow (
As shown in FIG. 1), the air flows in the direction in which air is drawn into the main body 1 from the upper wall of the main body 1 of the air conditioner. Note that at this time, if the ventilation fan 5 is turned on and used together with the dust collection unit, the amount of ventilation can of course be further increased.
一方、粉塵の粒子もイオン化線9により陽イオン化され
るか、電離した空気の陽イオンに衝突し陽イオンとなる
(このとき、大きな粉塵は誘電状態となる)。そのため
、該粉塵がマイナスに荷電されている1対の陰極板7内
に入ると該陰極板7に吸着される。また、吸着されずに
通過しようとする主として中央部分の粉塵は、対向陰極
8と印加電圧−7kVの陰極板7との平面電界により該
陰極板7に押し付けられるように吸着する。これにより
、陰極板7に集塵される。On the other hand, dust particles are also cationized by the ionization beam 9 or collide with ionized air cations to become cations (at this time, large dust particles become dielectric). Therefore, when the dust enters the pair of negatively charged cathode plates 7, it is attracted to the cathode plates 7. In addition, the dust mainly in the central portion that tries to pass through without being attracted is attracted by being pressed against the cathode plate 7 by the plane electric field between the opposing cathode 8 and the cathode plate 7 with an applied voltage of -7 kV. As a result, the dust is collected on the cathode plate 7.
このように、イオン化線9によりプラスに帯電された粉
塵、空気は陰極板7に引き寄せられ、粉塵が該陰極板7
に吸着されるとともに、空気が特に該粉塵に引っ張られ
るようにして当該陰極板7間を流れ、イオン化線9と反
対側に吐出される通風状態を連続的に生じる。In this way, the dust and air positively charged by the ionization wire 9 are attracted to the cathode plate 7, and the dust is attracted to the cathode plate 7.
At the same time, air flows between the cathode plates 7 so as to be particularly attracted by the dust, and is discharged to the side opposite to the ionization line 9, thereby continuously creating a ventilation state.
この結果、室内空気は、空調機本体lの上側壁に開口し
た吸入口2aがら空気通路2に沿って1対の陰極板7.
熱交換用コイル4、送風用ファン5を経て吐出口2bか
ら再び排出され、かかる循環を繰り返す。このとき、前
記1対の陰極板7に、通過する空気中のイオン化された
粉塵が吸着され、集塵されて空気の清浄化が図られる。As a result, indoor air flows through the pair of cathode plates 7 and 7 along the air passage 2 through the inlet 2a opened in the upper wall of the air conditioner main body l.
It passes through the heat exchange coil 4 and the blowing fan 5, and then is discharged again from the discharge port 2b, and this circulation is repeated. At this time, ionized dust in the passing air is adsorbed and collected by the pair of cathode plates 7, thereby purifying the air.
ここで、特に本発明では、熱交換用コイル4より上流側
の空気通路2を、イオン風の風方向が長手方向となるよ
うに本体1の厚み方向と直角方向、換言すれば本体1の
前面と略平行になるように形成したので、助走距離を充
分に(例えば100mm程度)確保できる。このため、
本体1の大型化を図らなくても集塵能力の高い集塵ユニ
ットを空調機本体1に一体的に装着できる。In particular, in the present invention, the air passage 2 on the upstream side of the heat exchange coil 4 is arranged in a direction perpendicular to the thickness direction of the main body 1, in other words, in a direction perpendicular to the thickness direction of the main body 1, so that the wind direction of the ion wind is in the longitudinal direction. Since it is formed so that it is substantially parallel to , a sufficient run-up distance (for example, about 100 mm) can be secured. For this reason,
A dust collection unit with high dust collection capacity can be integrally attached to the air conditioner body 1 without increasing the size of the body 1.
また、空気通路2を本体工の厚み方向と直角の方向に形
成するので、仮りに助走距離の長い集塵ユニットを装着
するときでも本体1の厚みを必要以上に増大することが
なく、すっきりした見栄えの良い意匠性に優れた空調機
とできる。In addition, since the air passage 2 is formed in the direction perpendicular to the thickness direction of the main body, even if a dust collection unit with a long run-up distance is installed, the thickness of the main body 1 will not be increased more than necessary, resulting in a neat and tidy structure. An air conditioner with good appearance and excellent design can be created.
また、吸入口2aを本体1の前面に設けることなく上面
に設ける構成としたので、使用者によく見える前面をす
っきりした形にできるとともに、前面には単にメクラ板
を取付けるだけのシンプルな構成としてもよく、このメ
クラ板にイラスト等を施すことによって空調機のさらな
る意匠性向上を図ることもできる。In addition, since the intake port 2a is provided on the top surface of the main body 1 instead of on the front surface, the front surface can be clearly seen by the user. It is also possible to further improve the design of the air conditioner by adding illustrations or the like to this blank board.
さらに、本実施例では、フェイス構成部材6aを着脱自
由に取付ける構成としたので、清掃性にも優れる。Furthermore, in this embodiment, since the face component 6a is configured to be freely attached and detached, cleaning performance is also excellent.
尚、本実施例では、吸入口2aを本体1の上壁面に開設
する構成としたが、これに限らず、左右いずれかの側壁
面であっても或いは下壁面であフても良い。In this embodiment, the suction port 2a is provided on the upper wall surface of the main body 1, but the invention is not limited to this, and it may be provided on either the left or right side wall surface or the lower wall surface.
また、吐出口2bをフェイス6の下部に形成したが、こ
れに限らず、例えば本体1の下壁面に形成する構成でも
良い。Further, although the discharge port 2b is formed at the lower part of the face 6, the present invention is not limited thereto, and may be formed, for example, at the lower wall surface of the main body 1.
さらに、吸入口2aに金網を装着する等しても良いこと
は明らかである。Furthermore, it is clear that a wire mesh may be attached to the suction port 2a.
また、陽極体として本実施例ではイオン化線9を適用し
たが、必ずしもこれに限るものではなく、電圧を加える
ことによって放電できれば良いのであって、例えば針で
も板でも先端が鋭利なものであれば良い。In addition, although the ionized wire 9 was used as the anode body in this embodiment, it is not necessarily limited to this, and any material that can discharge by applying a voltage is sufficient, for example, a needle or plate with a sharp tip can be used. good.
さらに、イオン化線9の配設方向は、本体1に対して奥
行き方向に配設したが、横幅方向に配設しても良く、こ
の場合にはこれに合わせて陰極板7及び対向極板8も同
方向に配設する。Further, although the ionized wire 9 is arranged in the depth direction with respect to the main body 1, it may be arranged in the width direction, and in this case, the cathode plate 7 and the counter electrode plate 8 are also placed in the same direction.
〈発明の効果)
以上説明したように、本発明によれば、電位差により風
を生じさせつつ除塵するシステムの空調機において、熱
交換器より上流側の集塵ユニットが配設される空気通路
部分を、陽極体と陰極板とを結ぶ空気流通方向と略平行
となるように形成して、イオン風の風方向が本体の厚み
方向と直角な方向となるように構成したので、本体の厚
みに悪影響を与えることなく充分な助走距離を確保でき
、集塵効率が高くスペース的にも有利でかつ意匠性にも
優れる空調機を提供できる。<Effects of the Invention> As explained above, according to the present invention, in an air conditioner of a system that removes dust while generating wind using a potential difference, the air passage portion where the dust collection unit is disposed upstream of the heat exchanger. is formed so that it is approximately parallel to the direction of air flow connecting the anode body and the cathode plate, and the direction of the ion wind is perpendicular to the thickness direction of the body. To provide an air conditioner that can secure a sufficient run-up distance without causing any adverse effects, has high dust collection efficiency, is advantageous in terms of space, and is excellent in design.
第1図は本発明に係る空調機の断面構成図、第2図は同
上空調機に適用される集塵ユニットを説明する図である
。
1・・・空調機本体 2・・・空気通路 2a・・
・吸入口 4・・・熱交換用コイル 7・・・陰極
板8・・・対向陰極 9・・・イオン化線 10・
・・トランス
特許出願人 ミサワホーム株式会社
代理人 弁理士 笹 島 冨二雄
第1図FIG. 1 is a cross-sectional configuration diagram of an air conditioner according to the present invention, and FIG. 2 is a diagram illustrating a dust collection unit applied to the same air conditioner. 1...Air conditioner body 2...Air passage 2a...
・Suction port 4... Heat exchange coil 7... Cathode plate 8... Opposing cathode 9... Ionization wire 10.
...Trans patent applicant Misawa Homes Co., Ltd. agent Patent attorney Fujio Sasashima Figure 1
Claims (1)
部分に、粉塵を含む空気をイオン化する陽極体と、その
下流側に相対向して平行に配設される1対の陰極板と、
前記1対の陰極板と陽極体に高電圧を印加する高電圧印
加手段と、からなる集塵ユニットを設けた空調機におい
て、前記陽極体と陰極板とを結ぶ空気流通方向が空調機
本体の厚さ方向に対して直角な方向となるように前記集
塵ユニットを配設したことを特徴とする空調機。An anode body that ionizes dust-containing air is placed in the air passage formed in the air conditioner body upstream of the heat exchanger, and a pair of cathode plates that are disposed opposite to each other in parallel on the downstream side of the anode body. ,
In an air conditioner equipped with a dust collection unit comprising the pair of cathode plates and a high voltage application means for applying a high voltage to the anode body, the air flow direction connecting the anode body and the cathode plate is in the direction of the air conditioner body. An air conditioner characterized in that the dust collection unit is arranged in a direction perpendicular to the thickness direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60098889A JPS61257252A (en) | 1985-05-11 | 1985-05-11 | Air conditioner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60098889A JPS61257252A (en) | 1985-05-11 | 1985-05-11 | Air conditioner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61257252A true JPS61257252A (en) | 1986-11-14 |
Family
ID=14231703
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60098889A Pending JPS61257252A (en) | 1985-05-11 | 1985-05-11 | Air conditioner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61257252A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02287028A (en) * | 1989-04-25 | 1990-11-27 | Sanyo Electric Co Ltd | Air-conditioner |
JPH0537352U (en) * | 1991-10-25 | 1993-05-21 | テイアツク株式会社 | Electrostatic air purifier |
WO2013038670A1 (en) * | 2011-09-16 | 2013-03-21 | パナソニック株式会社 | Air conditioner and air-conditioner indoor unit |
-
1985
- 1985-05-11 JP JP60098889A patent/JPS61257252A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02287028A (en) * | 1989-04-25 | 1990-11-27 | Sanyo Electric Co Ltd | Air-conditioner |
JPH0537352U (en) * | 1991-10-25 | 1993-05-21 | テイアツク株式会社 | Electrostatic air purifier |
WO2013038670A1 (en) * | 2011-09-16 | 2013-03-21 | パナソニック株式会社 | Air conditioner and air-conditioner indoor unit |
JP2013064524A (en) * | 2011-09-16 | 2013-04-11 | Panasonic Corp | Air conditioner |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0626886B1 (en) | A two-stage electrostatic filter | |
KR100498401B1 (en) | Plasma air cleaner | |
JPH0679196A (en) | Electric dust collector | |
CN206996856U (en) | Electrostatic precipitation module and conditioner | |
JPS61257252A (en) | Air conditioner | |
CN210425335U (en) | Small-size air purifier | |
CN207146637U (en) | Electrostatic precipitator and air conditioner | |
CN207756285U (en) | Electrostatic precipitator, air conditioner indoor unit and air conditioner | |
CN108072120A (en) | Air conditioner indoor unit and air conditioner | |
TWM563918U (en) | Scroll type electrostatic dust collecting device | |
JP2733092B2 (en) | Air purifier | |
CN207763077U (en) | Air conditioner indoor unit and air conditioner | |
JP2001179130A (en) | Air cleaner | |
KR100551491B1 (en) | Electric dust collector and air cleaner comprising it | |
JPH0417238Y2 (en) | ||
CN212227302U (en) | Two-side air inlet device of environment-friendly air conditioning fan | |
JPH03296453A (en) | Air purifier | |
KR102374472B1 (en) | Duct Type Air Conditioner | |
JP2001179127A (en) | Electric dust collector | |
KR100484868B1 (en) | electric air cleaner | |
JPH0236614Y2 (en) | ||
KR100192291B1 (en) | Electrical dust collect filter structure of airconditioner | |
KR100244321B1 (en) | Attaching point forming apparatus of electric dust collector for airconditioner | |
JPS59199063A (en) | Electrical dust precipitator | |
JPH0429766A (en) | Air purifier |