JP7804907B2

JP7804907B2 - Filter Unit

Info

Publication number: JP7804907B2
Application number: JP2022019333A
Authority: JP
Inventors: 昌志市橋; 直勝大澤; 竜太飯島; 経右大森
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2021-07-09
Filing date: 2022-02-10
Publication date: 2026-01-23
Anticipated expiration: 2041-07-09
Also published as: JP2023010123A; JP7081713B1; WO2023281768A1; CN115591343A; CN217410140U; JP2023010546A

Description

本発明は、空気清浄機に用いられるフィルタユニットに関する。 The present invention relates to a filter unit used in an air purifier.

特許文献１は、空気清浄機及びフィルタを開示する。空気清浄機は、ファンにより空気を吸引する。吸引された空気は、空気清浄機の内部でフィルタを通過することにより清浄された後、排出される。フィルタは、蛇腹折りされたＨＥＰＡフィルタが２カ所で折り曲げられてＵ字状とされた状態で、空気清浄機の内部に配置される。フィルタには、蛇腹折りの折り目が広がることを抑制するための止め枠が、フィルタのうち折り目の延びる方向（以下、折り目方向という。）の両端部に設けられる。 Patent Document 1 discloses an air purifier and a filter. The air purifier draws in air using a fan. The drawn-in air is purified by passing through a filter inside the air purifier before being discharged. The filter is a bellows-folded HEPA filter bent in two places to form a U-shape and placed inside the air purifier. The filter is provided with stop frames at both ends of the filter in the direction in which the bellows fold extends (hereinafter referred to as the fold direction) to prevent the bellows folds from widening.

特許第３８２９１０５号公報Patent No. 3829105

上記のフィルタは、折り目方向と直交する方向の両端部が使用中に捲れ上がる可能性がある。この場合、フィルタの形状が変形して空気の清浄機能が低下する可能性があるという問題点がある。 The above-mentioned filters have the risk of both ends perpendicular to the fold direction curling up during use. This can cause the filter to deform, potentially reducing its air purification function.

本発明の目的は、変形を軽減して空気の清浄機能の低下を抑制できるフィルタユニットを提供することである。 The object of the present invention is to provide a filter unit that can reduce deformation and prevent a decrease in air purification function.

本発明に係るフィルタユニットは、蛇腹折り形状を有するフィルタであって、第１部と、前記第１部のうち第１方向の一方側の端部から、前記第１方向と交差する第２方向の一方側に延びる第２部と、前記第１部のうち前記第１方向の他方側の端部から、前記第１方向と交差する第３方向の一方側に延びる第３部とを有し、前記第１部、前記第２部、及び前記第３部の夫々の蛇腹折りの折り目の延びる方向である折り目方向は、前記第１方向、前記第２方向、及び前記第３方向と直交する前記フィルタと、前記フィルタの前記折り目方向の両端部に設けられ、前記フィルタの形状を保形する第１保形部材と、前記第２部の前記交差方向の一方側の端部である第２先端部、及び、前記第３部の前記交差方向の一方側の端部である第３先端部の夫々に配置され、前記折り目方向に延びる第２保形部材とを備えたことを特徴とする。

a second portion extending from an end of the first portion on one side in a first direction in a second direction intersecting with the first direction, and a third portion extending from an end of the first portion on the other side in the first direction in a third direction intersecting with the first direction, wherein a fold direction, which is the direction in which the folds of the accordion folds of the first portion , the second portion, and the third portion extend, is perpendicular to the first direction, the second direction, and the third direction; first shape-retaining members provided at both ends of the filter in the fold direction and which maintain the shape of the filter; and second shape-retaining members arranged at a second tip portion which is an end on one side in the intersecting direction of the second portion and a third tip portion which is an end on one side in the intersecting direction of the third portion, and extending in the fold direction .

フィルタユニットは、フィルタのうち蛇腹折りの折り目方向と直交する方向の端部に対応する第２先端部及び第３先端部に、フィルタの形状を保形する第２保形部材を有する。
このためフィルタユニットは、フィルタのうち折り目方向と直交する方向の両端部が使用中に捲れ上がる可能性を軽減できるので、フィルタの変形を防止して空気の清浄機能の低下を抑制できる。 The filter unit has second shape-retaining members for retaining the shape of the filter at second and third tip portions corresponding to the ends of the filter in a direction perpendicular to the accordion-folded fold direction.
This reduces the possibility that the filter unit's both ends in a direction perpendicular to the fold direction will be rolled up during use, thereby preventing deformation of the filter and suppressing a decrease in the air purification function.

空気清浄機１Ａの斜視図である。FIG. 1 is a perspective view of an air purifier 1A. 空気清浄機１Ａの平面図である。FIG. 1 is a plan view of an air purifier 1A. 蓋３１を脱離した空気清浄機１Ａの斜視図である。FIG. 2 is a perspective view of the air purifier 1A with the lid 31 removed. 図２のＡ－Ａ線を矢印方向から視た断面図である。3 is a cross-sectional view taken along line AA of FIG. 2, viewed from the direction of the arrows. 図２のＢ－Ｂ線を矢印方向から視た断面図、及び、断面図の一部を拡大した拡大図である。3 is a cross-sectional view taken along line BB in FIG. 2, viewed from the direction of the arrows, and an enlarged view of a portion of the cross-sectional view. 空気清浄機１Ａの分解斜視図である。FIG. 2 is an exploded perspective view of the air purifier 1A. 第２保形部材７Ａ～７Ｄを示す図である。10A and 10B are diagrams showing second shape-retaining members 7A to 7D. 第２保形部材７Ｅ～７Ｈを示す図である。10A and 10B are diagrams showing second shape-retaining members 7E to 7H. 第２保形部材７Ｉ、７Ｊを示す図である。FIG. 10 is a view showing second shape-retaining members 7I and 7J. 第２保形部材７Ｋ、７Ｌを示す図である。FIG. 10 is a view showing second shape-retaining members 7K and 7L. 第２保形部材７Ｍ、７Ｎを示す図である。FIG. 10 is a diagram showing second shape-retaining members 7M and 7N. 空気清浄機１Ｂの斜視図である。FIG. 2 is a perspective view of the air purifier 1B.

本発明の一実施形態である空気清浄機１Ａ及びフィルタユニット６について説明する。
図１の上方、下方、右方、左方、左下方、及び右上方は、各々、空気清浄機１Ａの上方、下方、前方、後方、左方、及び右方である。図３の上方、下方、右下方、左上方、左下方、及び右上方は、各々、フィルタユニット６の上方、下方、前方、後方、左方、及び右方である。 An air purifier 1A and a filter unit 6 according to one embodiment of the present invention will be described.
1 correspond to the upper, lower, right, left, lower left, and upper right sides of the air purifier 1A, respectively. The upper, lower, lower right, upper left, lower left, and upper right sides of the filter unit 6, respectively.

空気清浄機１Ａは、周囲の空気を内部に吸い込む。内部に吸い込まれた空気は、空気清浄機１Ａに装着されたフィルタユニット６を通過することにより清浄される。清浄された空気は、空気清浄機１Ａから外部に吹き出される。 Air purifier 1A draws in ambient air. The air drawn in is purified by passing through filter unit 6 attached to air purifier 1A. The purified air is then blown out from air purifier 1A to the outside.

空気清浄機１Ａは、筐体２（図１～図３参照）、蓋３１（図１、図２参照）、送風機５Ｌ、５Ｒ（総称して「送風機５」という。図４、図６参照）、及び制御基板９（図６参照）を備える。 The air purifier 1A includes a housing 2 (see Figures 1 to 3), a lid 31 (see Figures 1 and 2), fans 5L and 5R (collectively referred to as "fans 5"; see Figures 4 and 6), and a control board 9 (see Figure 6).

＜筐体２＞
図１～図３に示すように、筐体２の形状は略６面体、より詳細には、左右方向に長い略直方体である。筐体２は、台座３Ｂ（図１、図３参照）、前壁３Ｆ、後壁３Ｓ、左壁３Ｌ、右壁３Ｒ（図２、図３参照）、上壁３Ｕを有する。台座３Ｂは略箱状を有し、制御基板９（図６参照）等を収容する為の空間が内部に形成される。前壁３Ｆ、後壁３Ｓ、左壁３Ｌ、右壁３Ｒは夫々板状を有し、台座３Ｂの上壁３０（図６参照）に連結する。前壁３Ｆ、後壁３Ｓ、左壁３Ｌ、右壁３Ｒは、各々、台座３Ｂの上壁３０の前端部、後端部、左端部、右端部から上方に向けて延びる。上壁３Ｕは板状を有し、前壁３Ｆ、後壁３Ｓ、左壁３Ｌ、右壁３Ｒの夫々の上端部に連結する。前壁３Ｆ、後壁３Ｓ、左壁３Ｌ、右壁３Ｒ、上壁３Ｕ、及び、台座３Ｂの上壁３０で囲まれた内部空間を、空洞部１０（図３参照）という。 <Case 2>
As shown in FIGS. 1 to 3 , the housing 2 is shaped like a substantially hexahedron, more specifically, a substantially rectangular parallelepiped elongated in the left-right direction. The housing 2 includes a base 3B (see FIGS. 1 and 3 ), a front wall 3F, a rear wall 3S, a left wall 3L, and a right wall 3R (see FIGS. 2 and 3 ), and a top wall 3U. The base 3B is substantially box-shaped, and a space is formed inside for accommodating components such as a control board 9 (see FIG. 6 ). The front wall 3F, the rear wall 3S, the left wall 3L, and the right wall 3R are each plate-shaped and connected to the top wall 30 (see FIG. 6 ) of the base 3B. The front wall 3F, the rear wall 3S, the left wall 3L, and the right wall 3R extend upward from the front end, rear end, left end, and right end of the top wall 30 of the base 3B, respectively. The top wall 3U is plate-shaped and connected to the upper ends of the front wall 3F, the rear wall 3S, the left wall 3L, and the right wall 3R. The internal space surrounded by the front wall 3F, rear wall 3S, left wall 3L, right wall 3R, top wall 3U, and top wall 30 of the base 3B is referred to as a cavity 10 (see FIG. 3).

図１、図２に示すように、上壁３Ｕは、左上壁３１Ｌ、右上壁３１Ｒを含む。左上壁３１Ｌは、前壁３Ｆと後壁３Ｓとの夫々の上端部のうち左端部近傍、及び、左壁３Ｌの上端部の間に架設される。右上壁３１Ｒは、前壁３Ｆと後壁３Ｓとの夫々の上端部のうち右端部近傍、及び、右壁３Ｒの上端部の間に架設される。図３に示すように、左上壁３１Ｌの右端部、右上壁３１Ｒの左端部、及び、前壁３Ｆと後壁３Ｓとの夫々の上端部は、矩形状の開口部２１を形成する。開口部２１は、空洞部１０を開放する。図１、図２に示すように、蓋３１は板状を有する。蓋３１は、開口部２１に装着された状態で、開口部２１を閉塞する。一方、蓋３１が開口部２１から脱離された場合、図３に示すように、開口部２１は空洞部１０を開放する。 As shown in Figures 1 and 2, the upper wall 3U includes an upper-left wall 31L and an upper-right wall 31R. The upper-left wall 31L is disposed between the upper ends of the front wall 3F and the rear wall 3S near the left ends and the upper end of the left wall 3L. The upper-right wall 31R is disposed between the upper ends of the front wall 3F and the rear wall 3S near the right ends and the upper end of the right wall 3R. As shown in Figure 3, the right end of the upper-left wall 31L, the left end of the upper-right wall 31R, and the upper ends of the front wall 3F and the rear wall 3S form a rectangular opening 21. The opening 21 exposes the cavity 10. As shown in Figures 1 and 2, the lid 31 has a plate shape. When attached to the opening 21, the lid 31 closes the opening 21. On the other hand, when the lid 31 is detached from the opening 21, the opening 21 exposes the cavity 10, as shown in Figure 3.

図４に示すように、台座３Ｂの上壁３０に区画壁３６Ｌ、３６Ｒが設けられる。区画壁３６Ｌは、開口部２１（図３参照）の左端部の下方に設けられる。区画壁３６Ｒは、開口部２１（図３参照）の右端部の下方に設けられる。区画壁３６Ｌ、３６Ｒは左右方向と直交する。区画壁３６Ｌ、３６Ｒには、スリット状の複数の貫通孔が形成される。区画壁３６Ｌ、３６Ｒは、空洞部１０を３つの部分（空洞部１０Ｕ、１０Ｌ、１０Ｒ）に区画する。空洞部１０Ｌは、空洞部１０のうち区画壁３６Ｌよりも左方の部位である。空洞部１０Ｒは、空洞部１０のうち区画壁３６Ｒよりも右方の部位である。空洞部１０Ｕは、空洞部１０のうち区画壁３６Ｌ、３６Ｒにて左右方向から挟まれた部位であり、装着された状態の蓋３１の下方に位置する。空洞部１０Ｕ、１０Ｌ、１０Ｒには各々、後述のフィルタユニット６、送風機５Ｌ、５Ｒが収容される。 As shown in Figure 4, partition walls 36L and 36R are provided on the upper wall 30 of the base 3B. Partition wall 36L is provided below the left end of the opening 21 (see Figure 3). Partition wall 36R is provided below the right end of the opening 21 (see Figure 3). Partition walls 36L and 36R are perpendicular to the left-right direction. Partition walls 36L and 36R have multiple slit-shaped through holes. Partition walls 36L and 36R divide cavity 10 into three sections (cavities 10U, 10L, and 10R). Cavity 10L is the portion of cavity 10 to the left of partition wall 36L. Cavity 10R is the portion of cavity 10 to the right of partition wall 36R. Cavity 10U is the portion of cavity 10 sandwiched between partition walls 36L and 36R on the left and right, and is located below lid 31 when attached. Cavities 10U, 10L, and 10R each house a filter unit 6 and fans 5L and 5R, which will be described later.

図１に示すように、蓋３１に吸込口２０Ｕが形成される。前壁３Ｆのうち、左右方向において開口部２１と重複する部分に、吸込口２０Ｆが形成される。図３に示すように、後壁３Ｓのうち、左右方向において開口部２１と重複する部分に、吸込口２０Ｓ（図３参照）が形成される。吸込口２０Ｕ、２０Ｆ、２０Ｓは夫々、スリット状の複数の貫通孔からなる。 As shown in Figure 1, suction port 20U is formed in lid 31. Suction port 20F is formed in a portion of front wall 3F that overlaps with opening 21 in the left-right direction. As shown in Figure 3, suction port 20S (see Figure 3) is formed in a portion of rear wall 3S that overlaps with opening 21 in the left-right direction. Suction ports 20U, 20F, and 20S each consist of a plurality of slit-shaped through-holes.

図６に示すように、筐体２の左右両端部の各々に、開口部２０Ｌ、２０Ｒが形成される。開口部２０Ｌは、上壁３Ｕ、前壁３Ｆ、後壁３Ｓ、及び台座３Ｂの上壁３０の夫々の左端部にて囲まれる。開口部２０Ｌは、空洞部１０Ｌに連通する（図４参照）。開口部２０Ｒは、上壁３Ｕ、前壁３Ｆ、後壁３Ｓ、及び台座３Ｂの上壁３０の夫々の右端部にて囲まれる。開口部２０Ｒは、空洞部１０Ｒに連通する（図４参照）。開口部２０Ｌ、２０Ｒは、左右方向に相対する。 As shown in FIG. 6, openings 20L and 20R are formed at both the left and right ends of the housing 2. Opening 20L is surrounded by the left ends of the top wall 3U, front wall 3F, rear wall 3S, and top wall 30 of the base 3B. Opening 20L communicates with cavity 10L (see FIG. 4). Opening 20R is surrounded by the right ends of the top wall 3U, front wall 3F, rear wall 3S, and top wall 30 of the base 3B. Opening 20R communicates with cavity 10R (see FIG. 4). Openings 20L and 20R face each other in the left-right direction.

左壁３Ｌは開口部２０Ｌに嵌り、右壁３Ｒは開口部２０Ｒに嵌る。左壁３Ｌには、円形の吹出口２２Ｌが設けられる。右壁３Ｒには、円形の吹出口２２Ｒが設けられる。吹出口２２Ｌ、２２Ｒの夫々にルーバ２３が嵌る。ルーバ２３は、平行に並んだ複数の羽板２３Ａを有する。ルーバ２３は、複数の羽板２３Ａの夫々の間の隙間を介して流れる空気の向きを、左右方向に対して傾斜した方向に変更する。ルーバ２３は、吹出口２２Ｌ、２２Ｒに対して摺動することにより、左壁３Ｌ又は右壁３Ｒに対して回転可能である。 The left wall 3L fits into the opening 20L, and the right wall 3R fits into the opening 20R. A circular air outlet 22L is provided in the left wall 3L. A circular air outlet 22R is provided in the right wall 3R. A louver 23 fits into each of the air outlets 22L, 22R. The louver 23 has multiple blades 23A arranged in parallel. The louver 23 changes the direction of air flowing through the gaps between each of the multiple blades 23A to a direction inclined relative to the left-right direction. The louver 23 slides relative to the air outlets 22L, 22R, and can therefore rotate relative to the left wall 3L or right wall 3R.

＜フィルタユニット６＞
フィルタユニット６は、空気からゴミ、塵埃等を取り除いて清浄する。図５、図６に示すように、フィルタユニット６はフィルタ６０を有する。フィルタ６０はＨＥＰＡフィルタである。図５に示すように、フィルタ６０は、厚板状のフィルタ基材に山折りの折り目と谷折りの折り目が繰り返し形成された形状、即ち蛇腹折り形状を有する。フィルタ６０は、第１部６Ｕ、第２部６Ｆ、第３部６Ｓ、第２屈曲部６０Ｆ、及び第３屈曲部６０Ｓを有する。 <Filter unit 6>
The filter unit 6 purifies the air by removing dirt, dust, and the like. As shown in Figures 5 and 6, the filter unit 6 includes a filter 60. The filter 60 is a HEPA filter. As shown in Figure 5, the filter 60 has a shape in which mountain folds and valley folds are repeatedly formed on a thick filter substrate, i.e., a bellows-folded shape. The filter 60 includes a first portion 6U, a second portion 6F, a third portion 6S, a second bend 60F, and a third bend 60S.

図６に示すように、第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓは、左右方向に延びる。
第１部６Ｕは上下方向と直交する。第１部６Ｕの前端部に、第２屈曲部６０Ｆが接続する。第２屈曲部６０Ｆは、第１部６Ｕとの接続部分から前方に向けて、下方に湾曲しながら延びる。第１部６Ｕの後端部に、第３屈曲部６０Ｓが接続する。第３屈曲部６０Ｓは、第１部６Ｕとの接続部分から後方に向けて、下方に湾曲しながら延びる。 As shown in FIG. 6, the first section 6U, the second section 6F, and the third section 6S extend in the left-right direction.
The first portion 6U is perpendicular to the up-down direction. A second bent portion 60F is connected to the front end of the first portion 6U. The second bent portion 60F extends forward from the connection with the first portion 6U while curving downward. A third bent portion 60S is connected to the rear end of the first portion 6U. The third bent portion 60S extends rearward from the connection with the first portion 6U while curving downward.

第２部６Ｆは、第２屈曲部６０Ｆの下端部から下方に向けて延びる。つまり、第２部６Ｆは、第２屈曲部６０Ｆを介して第１部６Ｕと連結し、第１部６Ｕの前端部近傍から下方に向けて延びる。第３部６Ｓは、第３屈曲部６０Ｓの下端部から下方に向けて延びる。つまり、第３部６Ｓは、第３屈曲部６０Ｓを介して第１部６Ｕと連結し、第１部６Ｕの後端部近傍から下方に向けて延びる。第２部６Ｆ及び第３部６Ｓは、第１部６Ｕよりも下側で前後方向に相対する。図５に示すように、フィルタ６０を左右方向と直交する平面で切断した時の断面形状は、略Ｕ字状となる。 The second section 6F extends downward from the lower end of the second bent section 60F. That is, the second section 6F is connected to the first section 6U via the second bent section 60F and extends downward from near the front end of the first section 6U. The third section 6S extends downward from the lower end of the third bent section 60S. That is, the third section 6S is connected to the first section 6U via the third bent section 60S and extends downward from near the rear end of the first section 6U. The second section 6F and the third section 6S face each other in the front-to-rear direction below the first section 6U. As shown in Figure 5, the cross-sectional shape of the filter 60 when cut along a plane perpendicular to the left-to-right direction is approximately U-shaped.

第１部６Ｕ、第２部６Ｆ、第３部６Ｓ、第２屈曲部６０Ｆ、及び第３屈曲部６０Ｓの夫々に形成された蛇腹折りの複数の折り目は、何れも左右方向に延び、且つ、前後方向及び上下方向と直交する。 The multiple accordion-folded folds formed in each of the first section 6U, second section 6F, third section 6S, second bend 60F, and third bend 60S all extend in the left-right direction and are perpendicular to the front-to-back and up-to-down directions.

第１部６Ｕよりも下側、第２部６Ｆよりも後側、及び、第３部６Ｓよりも前側の領域、即ち、第１部６Ｕ、第２部６Ｆ、第３部６Ｓ、第２屈曲部６０Ｆ、及び第３屈曲部６０Ｓで囲まれる領域を、内部領域６００という。第１部６Ｕ、第２部６Ｆ、第３部６Ｓ、第２屈曲部６０Ｆ、及び第３屈曲部６０Ｓの夫々のうち、内部領域６００に近接する縁部を内縁Ｅｉといい、内縁Ｅｉと反対側を外縁Ｅｏという。内縁Ｅｉは、第１部６Ｕ、第２部６Ｆ、第３部６Ｓ、第２屈曲部６０Ｆ、及び第３屈曲部６０Ｓの夫々の蛇腹折りの複数の折り目のうち、内部領域６００に近接する複数の折り目を結ぶ仮想線に沿って延びる。外縁Ｅｏは、第１部６Ｕ、第２部６Ｆ、第３部６Ｓ、第２屈曲部６０Ｆ、及び第３屈曲部６０Ｓの夫々の蛇腹折りの複数の折り目のうち、内部領域６００から離隔する複数の折り目を結ぶ仮想線に沿って延びる。 The area below the first portion 6U, behind the second portion 6F, and in front of the third portion 6S, i.e., the area surrounded by the first portion 6U, the second portion 6F, the third portion 6S, the second bend 60F, and the third bend 60S, is referred to as the inner region 600. The edge of each of the first portion 6U, the second portion 6F, the third portion 6S, the second bend 60F, and the third bend 60S that is closest to the inner region 600 is referred to as the inner edge Ei, and the side opposite the inner edge Ei is referred to as the outer edge Eo. The inner edge Ei extends along an imaginary line connecting the folds that are closest to the inner region 600 among the accordion-like folds of each of the first portion 6U, the second portion 6F, the third portion 6S, the second bend 60F, and the third bend 60S. The outer edge Eo extends along an imaginary line connecting multiple folds that are away from the internal region 600 among the multiple accordion-like folds of the first section 6U, the second section 6F, the third section 6S, the second bent section 60F, and the third bent section 60S.

なお、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの各々の曲率中心は、内部領域６００に配置される。このため、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの各々の内縁Ｅｉは、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの各々の曲率中心に近接する縁部に対応する。第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの各々の外縁Ｅｏは、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの各々の曲率中心から離隔する縁部に対応する。 The centers of curvature of the second bent portion 60F and the third bent portion 60S are located in the internal region 600. Therefore, the inner edge Ei of each of the second bent portion 60F and the third bent portion 60S corresponds to an edge portion close to the center of curvature of each of the second bent portion 60F and the third bent portion 60S. The outer edge Eo of each of the second bent portion 60F and the third bent portion 60S corresponds to an edge portion away from the center of curvature of each of the second bent portion 60F and the third bent portion 60S.

第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓの夫々の蛇腹折りの複数の折り目の間隔は同一である。以下、この間隔をｄ１と表記する。間隔ｄ１は、内縁Ｅｉ及び外縁Ｅｏに沿って配置される第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓの夫々の蛇腹折りの複数の折り目の間の間隔に対応する。第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の蛇腹折りの複数の折り目のうち、外縁Ｅｏに沿って配置される複数の折り目の間の間隔を、ｄ２と表記する。間隔ｄ２は、間隔ｄ１よりも大きい（ｄ１＜ｄ２）。第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の蛇腹折りの複数の折り目のうち、内縁Ｅｉに沿って配置される複数の折り目の間の間隔を、ｄ３と表記する。間隔ｄ３は間隔ｄ１と同一であり（ｄ１＝ｄ３）、間隔ｄ３よりも間隔ｄ２の方が大きい（ｄ２＞ｄ３）。 The spacing between the multiple accordion folds of each of the first, second, and third portions 6U, 6F, and 6S is the same. Hereinafter, this spacing will be referred to as d1. The spacing d1 corresponds to the spacing between the multiple accordion folds of each of the first, second, and third portions 6U, 6F, and 6S that are arranged along the inner edge Ei and outer edge Eo. The spacing between the multiple accordion folds of each of the second and third bent portions 60F and 60S that are arranged along the outer edge Eo will be referred to as d2. The spacing d2 is greater than the spacing d1 (d1 < d2). The spacing between the multiple accordion folds of each of the second and third bent portions 60F and 60S that are arranged along the inner edge Ei will be referred to as d3. The spacing d3 is the same as the spacing d1 (d1 = d3), and the spacing d2 is greater than the spacing d3 (d2 > d3).

フィルタユニット６が筐体２の空洞部１０Ｕに収容された状態で、フィルタ６０の第２部６Ｆは、前壁３Ｆのうち吸込口２０Ｆ（図１参照）が形成された部位に対して後側に配置される。フィルタ６０の第３部６Ｓは、後壁３Ｓのうち吸込口２０Ｓ（図６参照）が形成された部位に対して前側に配置される。フィルタ６０の第１部６Ｕは開口部２１に対して下方に対向し、開口部２１に装着された蓋３１（図１参照）に対して下側に配置される。 When the filter unit 6 is housed in the cavity 10U of the housing 2, the second portion 6F of the filter 60 is located behind the portion of the front wall 3F where the suction port 20F (see Figure 1) is formed. The third portion 6S of the filter 60 is located in front of the portion of the rear wall 3S where the suction port 20S (see Figure 6) is formed. The first portion 6U of the filter 60 faces downward toward the opening 21 and is located below the lid 31 (see Figure 1) attached to the opening 21.

図３に示すように、フィルタユニット６は、開口部２１から蓋３１が脱離された状態で露出する。ユーザは、開口部２１を介して空洞部１０Ｕからフィルタユニット６を取り出すことが可能である。 As shown in FIG. 3, the filter unit 6 is exposed when the lid 31 is removed from the opening 21. The user can remove the filter unit 6 from the cavity 10U through the opening 21.

＜第１保形部材６１＞
図６に示すように、フィルタ６０の左右方向両端部に第１保形部材６１が設けられる。
第１保形部材６１は不織布で構成された薄板状の部材である。第１保形部材６１は、保形部６１Ａ及び把持部６１Ｂを有する。保形部６１Ａは、フィルタ６０の断面形状と同一形状を有する。 <First shape-retaining member 61>
As shown in FIG. 6, first shape-retaining members 61 are provided on both left and right ends of the filter 60 .
The first shape-retaining member 61 is a thin plate-like member made of nonwoven fabric. The first shape-retaining member 61 has a shape-retaining portion 61A and a gripping portion 61B. The shape-retaining portion 61A has the same shape as the cross-sectional shape of the filter 60.

保形部６１Ａは、フィルタ６０の左右方向両端部に接着され、フィルタ６０の断面形状がＵ字状で維持されるように、フィルタ６０を保形する。把持部６１Ｂは、保形部６１Ａのうちフィルタ６０の第１部６Ｕの左右方向両端部に位置する部分、即ち保形部６１Ａの上端部に設けられ、上側に延びる。把持部６１Ｂは、フィルタ６０の第１部６Ｕの上端部よりも上方に突出する。把持部６１Ｂは、ユーザが空洞部１０Ｕからフィルタ６０を取り出す時に把持される。一方、蓋３１が開口部２１に装着される場合、把持部６１Ｂは、左右方向においてフィルタ６０とは反対側に折り曲げて空洞部１０Ｕに収納される。このとき、把持部６１Ｂは、上下方向においてフィルタ６０の第１部６Ｕの上端部と同一位置、又は、フィルタ６０の第１部６Ｕの上端部よりも下方に位置し、上方に突出しない。なお、把持部６１Ｂは、左右方向の内側、より詳細には、フィルタ６０の第１部６Ｕの上端部に当接するように折り曲げられてもよい。 The shape-retaining portion 61A is adhered to both left and right ends of the filter 60 and retains the shape of the filter 60 so that its cross-sectional shape remains U-shaped. The grip portion 61B is provided on the portions of the shape-retaining portion 61A located at both left and right ends of the first portion 6U of the filter 60, i.e., the upper end of the shape-retaining portion 61A, and extends upward. The grip portion 61B protrudes above the upper end of the first portion 6U of the filter 60. The user grasps the grip portion 61B when removing the filter 60 from the cavity 10U. On the other hand, when the lid 31 is attached to the opening 21, the grip portion 61B is folded left and right away from the filter 60 and stored in the cavity 10U. At this time, the grip portion 61B is located at the same position as the upper end of the first portion 6U of the filter 60 or below the upper end of the first portion 6U of the filter 60 in the vertical direction, and does not protrude upward. The grip portion 61B may be bent inward in the left-right direction, more specifically, so as to abut against the upper end of the first portion 6U of the filter 60.

フィルタ６０の左右方向両端部にはシール部材６２が設けられる。より具体的には、フィルタ６０の左右両端部に設けられた第１保形部材６１のうちフィルタ６０が設けられる側と反対側に、シール部材６２が設けられる。シール部材６２は、フィルタ６０の左端部に設けられた保形部６１Ａと区画壁３６Ｌ（図４参照）との間、及び、フィルタ６０の右端部に設けられた第１保形部材６１の保形部６１Ａと区画壁３６Ｒとの間に位置する。シール部材６２はフィルタ６０の断面形状と同一形状を有する。 Sealing members 62 are provided at both left and right ends of the filter 60. More specifically, the sealing members 62 are provided on the side of the first shape-retaining members 61 provided at both left and right ends of the filter 60 opposite the side on which the filter 60 is provided. The sealing members 62 are located between the shape-retaining portion 61A provided at the left end of the filter 60 and the partition wall 36L (see Figure 4), and between the shape-retaining portion 61A of the first shape-retaining member 61 provided at the right end of the filter 60 and the partition wall 36R. The sealing members 62 have the same cross-sectional shape as the filter 60.

シール部材６２は、弾性部材により構成される。シール部材６２の材料として、例えば軟質ウレタンフォームが用いられる。より具体的には、独泡タイプの軟質ウレタンフォームである。シール部材６２は、左右方向におけるフィルタ６０（第１保形部材６１）と区画壁３６Ｌとの間隙、及びフィルタ６０（第１保形部材６１）と区画壁３６Ｒとの間隙を埋める。シール部材６２が設けられることで、送風機５Ｌ、５Ｒによるフィルタ６０を介した空気の吸引効率が向上する。 The sealing member 62 is made of an elastic material. For example, soft urethane foam is used as the material for the sealing member 62. More specifically, it is closed-cell soft urethane foam. The sealing member 62 fills the gap between the filter 60 (first shape-retaining member 61) and the partition wall 36L in the left-right direction, and the gap between the filter 60 (first shape-retaining member 61) and the partition wall 36R. The provision of the sealing member 62 improves the efficiency with which the fans 5L and 5R suction air through the filter 60.

＜第２保形部材７＞
図７～図９を参照し、第２保形部材７について説明する。なお、図１～図６において、第２保形部材７は省略されている。本実施形態では、第２保形部材７として、第２保形部材７Ａ～７Ｄ（図７参照）、７Ｅ～７Ｈ（図８参照）、７Ｉ、７Ｊ（図９参照）のうち何れかを選択的に適用したり、第２保形部材７Ａ～７Ｊのうち少なくとも２つを組み合わせて適用したりすることが可能である。 <Second shape-retaining member 7>
The second shape-retaining member 7 will be described with reference to Figures 7 to 9. Note that the second shape-retaining member 7 is omitted in Figures 1 to 6. In this embodiment, it is possible to selectively apply any one of second shape-retaining members 7A to 7D (see Figure 7), 7E to 7H (see Figure 8), 7I, and 7J (see Figure 9) as the second shape-retaining member 7, or to apply a combination of at least two of the second shape-retaining members 7A to 7J.

第２保形部材７は、フィルタ６０のうち隣接する蛇腹折りの複数の山折りの折り目どうし、又は、隣接する蛇腹折りの複数の谷折りの折り目どうしを連結する。これにより、第２保形部材７は、蛇腹折りの複数の折り目を維持し、複数の折り目が温度上昇により開くことを抑制する。第２保形部材７の材料として、ホットメルト接着剤又は接着テープが用いられる。ホットメルト接着剤が用いられる場合、加熱により液体化したホットメルト接着剤がフィルタ６０に塗布され、その後、ホットメルト接着剤が冷却されることにより、第２保形部材７が形成される。接着テープが用いられる場合、基材の一面に粘着剤が塗布された片面接着テープがフィルタ６０に貼付されることにより、第２保形部材７が形成される。 The second shape-retaining member 7 connects multiple mountain folds or multiple valley folds of adjacent accordion folds of the filter 60. This allows the second shape-retaining member 7 to maintain the multiple accordion folds and prevent them from opening due to temperature increases. The second shape-retaining member 7 is made of a hot melt adhesive or adhesive tape. When a hot melt adhesive is used, the hot melt adhesive is heated and liquefied, and then applied to the filter 60. The hot melt adhesive is then cooled to form the second shape-retaining member 7. When adhesive tape is used, the second shape-retaining member 7 is formed by adhering a single-sided adhesive tape, which has a base material coated with an adhesive on one side, to the filter 60.

以下、図７Ｂに示すように、フィルタ６０の第２部６Ｆの下端部を、第２先端部６５Ｆといい、フィルタ６０の第３部６Ｓの下端部を、第３先端部６５Ｓという。第２先端部６５Ｆに対し、フィルタ６０に沿った方向において第２先端部６５Ｆに隣接する蛇腹折りの折り目を、第２隣接折り目６５Ｍという。フィルタ６０の第２先端部６５Ｆと第２隣接折り目６５Ｍとの間の部分のうち下側を向く面を、第２端面６６Ｆという。第３先端部６５Ｓに対し、フィルタ６０に沿った方向において第３先端部６５Ｓに隣接する蛇腹折りの折り目を、第３隣接折り目６５Ｎという。フィルタ６０の第３先端部６５Ｓと第３隣接折り目６５Ｎとの間の部分のうち下側を向く面を、第３端面６６Ｓという。 Hereinafter, as shown in FIG. 7B, the lower end of the second portion 6F of the filter 60 will be referred to as the second tip portion 65F, and the lower end of the third portion 6S of the filter 60 will be referred to as the third tip portion 65S. The accordion-folded fold adjacent to the second tip portion 65F in the direction along the filter 60 will be referred to as the second adjacent fold portion 65M. The downward-facing surface of the portion of the filter 60 between the second tip portion 65F and the second adjacent fold portion 65M will be referred to as the second end surface 66F. The accordion-folded fold adjacent to the third tip portion 65S in the direction along the filter 60 will be referred to as the third adjacent fold portion 65N. The downward-facing surface of the portion of the filter 60 between the third tip portion 65S and the third adjacent fold portion 65N will be referred to as the third end surface 66S.

本実施形態では、フィルタ６０として、第２先端部６５Ｆ及び第３先端部６５Ｓの位置が夫々異なるフィルタ６０Ａ（図７（Ｂ）（Ｄ）、図８（Ｂ）（Ｄ）参照）、６０Ｂ（図７（Ｃ）（Ｅ）、図８（Ｃ）（Ｅ）参照）が用いられる。図７（Ｂ）（Ｄ）、図８（Ｂ）（Ｄ）に示すように、フィルタ６０Ａでは、第２先端部６５Ｆ及び第３先端部６５Ｓがフィルタ６０の内縁Ｅｉに位置する。一方、図７（Ｃ）（Ｅ）、図８（Ｃ）（Ｅ）に示すように、フィルタ６０Ｂでは、第２先端部６５Ｆ及び第３先端部６５Ｓがフィルタ６０Ｂの外縁Ｅｏに位置する。 In this embodiment, filters 60A (see Figures 7(B)(D) and 8(B)(D)) and 60B (see Figures 7(C)(E) and 8(C)(E)) are used as the filter 60, in which the second tip 65F and the third tip 65S are located at different positions. As shown in Figures 7(B)(D) and 8(B)(D), in filter 60A, the second tip 65F and the third tip 65S are located at the inner edge Ei of the filter 60. On the other hand, as shown in Figures 7(C)(E) and 8(C)(E), in filter 60B, the second tip 65F and the third tip 65S are located at the outer edge Eo of the filter 60B.

図７（Ａ）、図８（Ａ）に示すように、第２保形部材７Ａ～７Ｈは、フィルタ６０のうち左右方向の中央に設けられる。第２保形部材７Ａ～７Ｈの左右方向の長さは、フィルタ６０の左右方向の長さよりも短い。第２保形部材７Ａ～７Ｈは、フィルタ６０の第１部６Ｕ、第２部６Ｆ、第３部６Ｓに亘って、蛇腹折りの複数の折り目の方向と直交する方向に延びる。 As shown in Figures 7(A) and 8(A), the second shape-retaining members 7A-7H are located in the left-right center of the filter 60. The left-right length of the second shape-retaining members 7A-7H is shorter than the left-right length of the filter 60. The second shape-retaining members 7A-7H extend across the first section 6U, second section 6F, and third section 6S of the filter 60 in a direction perpendicular to the direction of the multiple accordion-folded folds.

図７（Ｂ）に示すように、第２保形部材７Ａは保形部７１Ａを有する。保形部７１Ａは、フィルタ６０Ａの内縁Ｅｉに位置する第２先端部６５Ｆから、第２部６Ｆ、第２屈曲部６０Ｆ、第１部６Ｕ、第３屈曲部６０Ｓ、及び第３部６Ｓの夫々の内縁Ｅｉを経由し、内縁Ｅｉに位置する第３先端部６５Ｓに亘って帯状に延びる。 As shown in Figure 7(B), the second shape-retaining member 7A has a shape-retaining portion 71A. The shape-retaining portion 71A extends in a strip-like shape from the second tip portion 65F located on the inner edge Ei of the filter 60A, through the inner edges Ei of the second portion 6F, second bent portion 60F, first portion 6U, third bent portion 60S, and third portion 6S, to the third tip portion 65S located on the inner edge Ei.

図７（Ｃ）に示すように、第２保形部材７Ｂは保形部７１Ｂを有する。保形部７１Ｂは、フィルタ６０Ｂの外縁Ｅｏに位置する第２先端部６５Ｆから、第２部６Ｆ、第２屈曲部６０Ｆ、第１部６Ｕ、第３屈曲部６０Ｓ、及び第３部６Ｓの夫々の外縁Ｅｏを経由し、外縁Ｅｏに位置する第３先端部６５Ｓに亘って帯状に延びる。つまり、第２保形部材７Ａはフィルタ６０Ａの内縁Ｅｉに設けられ、第２保形部材７Ｂはフィルタ６０Ｂの外縁Ｅｏに設けられる。 As shown in Figure 7(C), the second shape-retaining member 7B has a shape-retaining portion 71B. The shape-retaining portion 71B extends in a strip-like shape from the second tip portion 65F located at the outer edge Eo of the filter 60B, through the outer edges Eo of the second portion 6F, second bent portion 60F, first portion 6U, third bent portion 60S, and third portion 6S, and to the third tip portion 65S located at the outer edge Eo. In other words, the second shape-retaining member 7A is provided on the inner edge Ei of the filter 60A, and the second shape-retaining member 7B is provided on the outer edge Eo of the filter 60B.

図７（Ｄ）に示すように、第２保形部材７Ｃは保形部７１Ａ、７２Ａを有する。保形部７１Ａは、第２保形部材７Ａ（図７（Ｂ）参照）の保形部７１Ａと同一である。保形部７２Ａは、フィルタ６０Ａの外縁Ｅｏに位置する第２隣接折り目６５Ｍから、第２部６Ｆ、第２屈曲部６０Ｆ、第１部６Ｕ、第３屈曲部６０Ｓ、及び第３部６Ｓの夫々の外縁Ｅｏを経由し、フィルタ６０Ａの外縁Ｅｏに位置する第３隣接折り目６５Ｎに亘って帯状に延びる。 As shown in Figure 7(D), the second shape-retaining member 7C has shape-retaining portions 71A and 72A. Shape-retaining portion 71A is identical to shape-retaining portion 71A of the second shape-retaining member 7A (see Figure 7(B)). Shape-retaining portion 72A extends in a strip-like shape from the second adjacent fold 65M located at the outer edge Eo of the filter 60A, through the outer edges Eo of the second portion 6F, second bent portion 60F, first portion 6U, third bent portion 60S, and third portion 6S, and to the third adjacent fold 65N located at the outer edge Eo of the filter 60A.

図７（Ｅ）に示すように、第２保形部材７Ｄは保形部７１Ｂ、７２Ｂを有する。保形部７１Ｂは、第２保形部材７Ｂ（図７（Ｃ）参照）の保形部７１Ｂと同一である。保形部７２Ｂは、フィルタ６０Ｂの内縁Ｅｉに位置する第２隣接折り目６５Ｍから、第２部６Ｆ、第２屈曲部６０Ｆ、第１部６Ｕ、第３屈曲部６０Ｓ、及び第３部６Ｓの夫々の内縁Ｅｉを経由し、フィルタ６０Ｂの内縁Ｅｉに位置する第３隣接折り目６５Ｎに亘って帯状に延びる。つまり、第２保形部材７Ｃ、７Ｄは、何れも、フィルタ６０の内縁Ｅｉ及び外縁Ｅｏに設けられる。 As shown in Figure 7(E), the second shape-retaining member 7D has shape-retaining portions 71B and 72B. Shape-retaining portion 71B is identical to shape-retaining portion 71B of the second shape-retaining member 7B (see Figure 7(C)). Shape-retaining portion 72B extends in a strip-like shape from the second adjacent fold 65M located on the inner edge Ei of the filter 60B, through the inner edges Ei of the second portion 6F, second bent portion 60F, first portion 6U, third bent portion 60S, and third portion 6S, and across to the third adjacent fold 65N located on the inner edge Ei of the filter 60B. In other words, the second shape-retaining members 7C and 7D are both provided on the inner edge Ei and outer edge Eo of the filter 60B.

図８（Ｂ）に示すように、第２保形部材７Ｅは、第２保形部材７Ａ（図７（Ｂ）参照）の保形部７１Ａに加えて保形部７３Ａ、７４Ａを有する点で、第２保形部材７Ａと相違する。保形部７３Ａは、フィルタ６０Ａの第２端面６６Ｆの一部に設けられる。保形部７３Ａは、第２先端部６５Ｆにおいて保形部７１Ａと連結する。保形部７４Ａは、フィルタ６０Ａの第３端面６６Ｓの一部に設けられる。保形部７４Ａは、第３先端部６５Ｓにおいて保形部７１Ａと連結する。保形部７３Ａ、７４Ａの左右方向の長さは、保形部７１Ａの左右方向の長さと同一である。 As shown in Figure 8 (B), the second shape-retaining member 7E differs from the second shape-retaining member 7A (see Figure 7 (B)) in that it has shape-retaining portions 73A and 74A in addition to the shape-retaining portion 71A of the second shape-retaining member 7A. Shape-retaining portion 73A is provided on a portion of the second end surface 66F of the filter 60A. Shape-retaining portion 73A is connected to shape-retaining portion 71A at the second tip portion 65F. Shape-retaining portion 74A is provided on a portion of the third end surface 66S of the filter 60A. Shape-retaining portion 74A is connected to shape-retaining portion 71A at the third tip portion 65S. The left-right length of shape-retaining portions 73A and 74A is the same as the left-right length of shape-retaining portion 71A.

図８（Ｃ）に示すように、第２保形部材７Ｆは、第２保形部材７Ｂ（図７（Ｃ）参照）の保形部７１Ｂに加えて保形部７３Ｂ、７４Ｂを有する点で、第２保形部材７Ｂと相違する。保形部７３Ｂは、フィルタ６０Ｂの第２端面６６Ｆの一部に設けられる。保形部７３Ｂは、第２先端部６５Ｆにおいて保形部７１Ｂと連結する。保形部７４Ｂは、フィルタ６０Ｂの第３端面６６Ｓの一部に設けられる。保形部７４Ｂは、第３先端部６５Ｓにおいて保形部７１Ｂと連結する。保形部７３Ｂ、７４Ｂの左右方向の長さは、保形部７１Ｂの左右方向の長さと同一である。 As shown in Figure 8 (C), the second shape-retaining member 7F differs from the second shape-retaining member 7B (see Figure 7 (C)) in that it has shape-retaining portions 73B and 74B in addition to the shape-retaining portion 71B of the second shape-retaining member 7B. Shape-retaining portion 73B is provided on a portion of the second end surface 66F of the filter 60B. Shape-retaining portion 73B connects to shape-retaining portion 71B at the second tip portion 65F. Shape-retaining portion 74B is provided on a portion of the third end surface 66S of the filter 60B. Shape-retaining portion 74B connects to shape-retaining portion 71B at the third tip portion 65S. The left-right length of shape-retaining portions 73B and 74B is the same as the left-right length of shape-retaining portion 71B.

図８（Ｄ）に示すように、第２保形部材７Ｇは、保形部７１Ａ、７２Ａ、７３Ａ、７４Ａを有する。保形部７１Ａ、７２Ａは、第２保形部材７Ｃ（図７（Ｄ）参照）の保形部７１Ａ、７２Ａと同一である。保形部７３Ａ、７４Ａは、第２保形部材７Ｅ（図８（Ｂ）参照）の保形部７３Ａ、７４Ａと同一である。保形部７３Ａは、第２隣接折り目６５Ｍにおいて保形部７２Ａと連結する。保形部７４Ａは、第３隣接折り目６５Ｎにおいて保形部７２Ａと連結する。 As shown in Figure 8(D), the second shape-retaining member 7G has shape-retaining portions 71A, 72A, 73A, and 74A. Shape-retaining portions 71A and 72A are identical to shape-retaining portions 71A and 72A of the second shape-retaining member 7C (see Figure 7(D)). Shape-retaining portions 73A and 74A are identical to shape-retaining portions 73A and 74A of the second shape-retaining member 7E (see Figure 8(B)). Shape-retaining portion 73A is connected to shape-retaining portion 72A at the second adjacent fold 65M. Shape-retaining portion 74A is connected to shape-retaining portion 72A at the third adjacent fold 65N.

図８（Ｅ）に示すように、第２保形部材７Ｈは、保形部７１Ｂ、７２Ｂ、７３Ｂ、７４Ｂを有する。保形部７１Ｂ、７２Ｂは、第２保形部材７Ｄ（図７（Ｅ）参照）の保形部７１Ｂ、７２Ｂと同一である。保形部７３Ｂ、７４Ｂは、第２保形部材７Ｆ（図８（Ｃ）参照）の保形部７３Ｂ、７４Ｂと同一である。保形部７３Ｂは、第２隣接折り目６５Ｍにおいて保形部７２Ｂと連結する。保形部７４Ｂは、第３隣接折り目６５Ｎにおいて保形部７２Ｂと連結する。つまり、第２保形部材７Ｇ、７Ｈは、何れも、フィルタ６０の内縁Ｅｉ、外縁Ｅｏ、第２端面６６Ｆ、及び第３端面６６Ｓに亘って設けられる。 As shown in Figure 8(E), the second shape-retaining member 7H has shape-retaining portions 71B, 72B, 73B, and 74B. Shape-retaining portions 71B and 72B are identical to shape-retaining portions 71B and 72B of the second shape-retaining member 7D (see Figure 7(E)). Shape-retaining portions 73B and 74B are identical to shape-retaining portions 73B and 74B of the second shape-retaining member 7F (see Figure 8(C)). Shape-retaining portion 73B is connected to shape-retaining portion 72B at the second adjacent fold 65M. Shape-retaining portion 74B is connected to shape-retaining portion 72B at the third adjacent fold 65N. In other words, the second shape-retaining members 7G and 7H are both provided across the inner edge Ei, outer edge Eo, second end face 66F, and third end face 66S of the filter 60.

なお、図８（Ｂ）～（Ｅ）に示す保形部７３Ａ、７３Ｂは、第２端面６６Ｆのうち第２先端部６５Ｆから第２隣接折り目６５Ｍまで延びていてもよいし、第２端面６６Ｆのうち第２先端部６５Ｆから、第２隣接折り目６５Ｍよりも第２先端部６５Ｆ側の部分まで延びていてもよい。つまり、保形部７３Ａ、７３Ｂのうち第２隣接折り目６５Ｍに近接する端部は、第２隣接折り目６５Ｍに対して第２先端部６５Ｆ側に離隔してもよい。保形部７４Ａ、７４Ｂは、第３端面６６Ｓのうち第３先端部６５Ｓから第３隣接折り目６５Ｎまで延びていてもよいし、第３端面６６Ｓのうち第３先端部６５Ｓから、第３隣接折り目６５Ｎよりも第３先端部６５Ｓ側の部分まで延びていてもよい。つまり、保形部７４Ａ、７４Ｂのうち第３隣接折り目６５Ｎに近接する端部は、第３隣接折り目６５Ｎに対して第３先端部６５Ｓ側に離隔してもよい。 8(B) to 8(E) may extend from the second tip 65F of the second end surface 66F to the second adjacent fold 65M, or may extend from the second tip 65F of the second end surface 66F to a portion of the second end surface 66F closer to the second tip 65F than the second adjacent fold 65M. In other words, the end of each of the shape retaining portions 73A and 73B closest to the second adjacent fold 65M may be spaced closer to the second tip 65F than the second adjacent fold 65M. The shape retaining portions 74A and 74B may extend from the third tip 65S of the third end surface 66S to the third adjacent fold 65N, or may extend from the third tip 65S of the third end surface 66S to a portion of the third end surface 66S closer to the third tip 65S than the third adjacent fold 65N. In other words, the ends of the shape-retaining portions 74A and 74B closest to the third adjacent fold 65N may be spaced apart from the third adjacent fold 65N toward the third tip portion 65S.

更に、図８（Ｄ）（Ｅ）に示す保形部７３Ａ、７３Ｂは、第２端面６６Ｆのうち第２隣接折り目６５Ｍから、第２先端部６５Ｆよりも第２隣接折り目６５Ｍ側の部分まで延びていてもよい。つまり、保形部７３Ａ、７３Ｂのうち第２先端部６５Ｆに近接する端部は、第２先端部６５Ｆに対して第２隣接折り目６５Ｍ側に離隔してもよい。保形部７４Ａ、７４Ｂは、第３端面６６Ｓのうち第３隣接折り目６５Ｎから、第３先端部６５Ｓよりも第３隣接折り目６５Ｎ側の部分まで延びていてもよい。つまり、保形部７４Ａ、７４Ｂのうち第３先端部６５Ｓに近接する端部は、第３先端部６５Ｓに対して第３隣接折り目６５Ｎ側に離隔してもよい。 Furthermore, the shape retaining portions 73A and 73B shown in Figures 8(D) and (E) may extend from the second adjacent fold 65M of the second end surface 66F to a portion closer to the second adjacent fold 65M than the second tip 65F. In other words, the ends of the shape retaining portions 73A and 73B closest to the second tip 65F may be spaced closer to the second adjacent fold 65M than the second tip 65F. The shape retaining portions 74A and 74B may extend from the third adjacent fold 65N of the third end surface 66S to a portion closer to the third adjacent fold 65N than the third tip 65S. In other words, the ends of the shape retaining portions 74A and 74B closest to the third tip 65S may be spaced closer to the third adjacent fold 65N than the third tip 65S.

図９（Ａ）に示す第２保形部材７Ｉ、及び、図９（Ｂ）に示す第２保形部材７Ｊは、第２端面６６Ｆに設けられる保形部７３Ａ、７３Ｂ、及び、第２端面６６Ｆに設けられる保形部７４Ａ、７４Ｂの形状が、図８に示す第２保形部材７Ｅ～７Ｈと相違する。 The second shape-retaining member 7I shown in Figure 9(A) and the second shape-retaining member 7J shown in Figure 9(B) differ from the second shape-retaining members 7E to 7H shown in Figure 8 in the shapes of the shape-retaining portions 73A, 73B provided on the second end surface 66F and the shape-retaining portions 74A, 74B provided on the second end surface 66F.

図９（Ａ）に示す第２保形部材７Ｉにおいて、保形部７３Ａ、７３Ｂは、第２端面６６Ｆの全域に設けられる。保形部７４Ａ、７４Ｂは、第３端面６６Ｓの全域に設けられる。
保形部７３Ａ、７３Ｂ、７４Ａ、７４Ｂの左右方向の長さは、フィルタ６０の左右方向の長さと同一であり、保形部７１Ａ、７１Ｂ、７２Ａ、７２Ｂのうち第２先端部６５Ｆ及び第３先端部６５Ｓに設けられた部分の前後方向の長さよりも長い。つまり、第２保形部材７Ｉの保形部７３Ａ、７３Ｂ、７４Ａ、７４Ｂは、第２保形部材７Ｅ～７Ｈの保形部７３Ａ、７３Ｂ、７４Ａ、７４Ｂよりも左右方向に長い。 9A, shape-retaining portions 73A and 73B are provided over the entire second end surface 66F, and shape-retaining portions 74A and 74B are provided over the entire third end surface 66S.
The left-right length of the shape retaining portions 73A, 73B, 74A, and 74B is the same as the left-right length of the filter 60, and is longer than the front-rear length of the portions of the shape retaining portions 71A, 71B, 72A, and 72B that are provided at the second tip portion 65F and the third tip portion 65S. In other words, the shape retaining portions 73A, 73B, 74A, and 74B of the second shape retaining member 7I are longer in the left-right direction than the shape retaining portions 73A, 73B, 74A, and 74B of the second shape retaining members 7E to 7H.

図９（Ｂ）に示す第２保形部材７Ｊの保形部７３Ａ、７３Ｂ、７４Ａ、７４Ｂは、図９（Ａ）に示す第２保形部材７Ｉの保形部７３Ａ、７３Ｂ、７４Ａ、７４Ｂが左右方向に３分割された形状を有する。３分割された保形部７３Ａ、７３Ｂ、７４Ａ、７４Ｂの夫々の左右方向の長さは、保形部７１Ａ、７１Ｂ、７２Ａ、７２Ｂのうち第２先端部６５Ｆ及び第３先端部６５Ｓに設けられた部分の前後方向の長さよりも長い。 The shape retaining portions 73A, 73B, 74A, and 74B of the second shape retaining member 7J shown in Figure 9(B) have a shape obtained by dividing the shape retaining portions 73A, 73B, 74A, and 74B of the second shape retaining member 7I shown in Figure 9(A) into three parts in the left-right direction. The left-right length of each of the three divided shape retaining portions 73A, 73B, 74A, and 74B is longer than the front-to-rear length of the portions of the shape retaining portions 71A, 71B, 72A, and 72B provided at the second tip portion 65F and the third tip portion 65S.

＜フィルタユニット６の製造方法＞
はじめに、平面状のフィルタ基材に対して熱が加えられて加熱される。次に、フィルタ基材は、高温状態で蛇腹折りの複数の折り目に沿って折り曲げられる。その後、フィルタ基材は冷却される。これにより、フィルタ基材に形成された蛇腹折りの複数の折り目は保持される。 <Method of manufacturing filter unit 6>
First, heat is applied to a planar filter substrate to heat it. Next, the filter substrate is folded along the accordion-like folds while in a hot state. After that, the filter substrate is cooled. As a result, the accordion-like folds formed in the filter substrate are maintained.

次に、蛇腹折りの複数の折り目が形成されたフィルタ基材が２カ所で折り曲げられ、第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓを有するフィルタ６０が作成される。次に、フィルタ６０に対し、第１保形部材６１、シール部材６２、及び第２保形部材７が取り付けられる。以上により、フィルタユニット６は完成する。 Next, the filter substrate, with multiple accordion-like folds formed, is folded in two places to create the filter 60, which has a first section 6U, a second section 6F, and a third section 6S. Next, the first shape-retaining member 61, the sealing member 62, and the second shape-retaining member 7 are attached to the filter 60. This completes the filter unit 6.

なお、上記のように作成されたフィルタ６０は、温度が上昇した場合に変形し、蛇腹折りの複数の折り目は元に戻ろうとする。しかし、第１保形部材６１及び第２保形部材７が取り付けられているので、フィルタ６０の蛇腹折りの複数の折り目は、温度が上昇しても維持される。 The filter 60 manufactured as described above will deform when the temperature rises, and the multiple accordion-like folds will attempt to return to their original shape. However, because the first shape-retaining member 61 and the second shape-retaining member 7 are attached, the multiple accordion-like folds of the filter 60 will remain in place even when the temperature rises.

＜送風機５＞
図４に示すように、送風機５は、軸流型の送風機である。送風機５Ｌ、５Ｒは、筐体２における左右方向の両端部に設けられる。より具体的には、送風機５Ｌは、シール部材５５Ｌ（図６参照）を介して空洞部１０Ｌに固定される。送風機５Ｌは左壁３Ｌの右方に隣接する。シール部材５５Ｌは、弾性部材（例えば軟質ウレタンフォーム）で構成され、左上壁３１Ｌ、前壁３Ｆ、後壁３Ｓ、及び台座３Ｂの上壁３０と後述する送風機５Ｌのケーシング５１との間隙を埋める。送風機５Ｒは、シール部材５５Ｒ（図６参照）を介して空洞部１０Ｒに固定される。送風機５Ｒは右壁３Ｒの左方に隣接する。シール部材５５Ｒは、弾性部材（例えば軟質ウレタンフォーム）で構成され、右上壁３１Ｒ、前壁３Ｆ、後壁３Ｓ、及び台座３Ｂの上壁３０と後述する送風機５Ｒのケーシング５１との間隙を埋める。シール部材５５Ｌ、５５Ｒが設けられることで、送風機５Ｌ、５Ｒによるフィルタ６０を介した空気の吸引効率が向上する。空洞部１０Ｕに収容されたフィルタユニット６は、左右方向において送風機５Ｌ、５Ｒの間に配置される。 <Blower 5>
As shown in FIG. 4 , the blower 5 is an axial-flow type blower. The blowers 5L and 5R are provided at both left and right ends of the housing 2. More specifically, the blower 5L is fixed to the cavity 10L via a sealing member 55L (see FIG. 6 ). The blower 5L is adjacent to the right side of the left wall 3L. The sealing member 55L is made of an elastic member (e.g., soft urethane foam) and fills gaps between the upper left wall 31L, the front wall 3F, the rear wall 3S, and the upper wall 30 of the base 3B and a casing 51 of the blower 5L (described later). The blower 5R is fixed to the cavity 10R via a sealing member 55R (see FIG. 6 ). The blower 5R is adjacent to the left side of the right wall 3R. The sealing member 55R is made of an elastic material (e.g., soft urethane foam) and fills the gaps between the upper right wall 31R, the front wall 3F, the rear wall 3S, and the upper wall 30 of the base 3B and the casing 51 of the fan 5R, which will be described later. The provision of the sealing members 55L, 55R improves the efficiency with which the fans 5L, 5R suction air through the filter 60. The filter unit 6 housed in the hollow portion 10U is disposed between the fans 5L, 5R in the left-right direction.

図４、図６に示すように、送風機５Ｌ、５Ｒは、夫々、ケーシング５１、ファン５２、及びモータ５３を備える。ケーシング５１は角筒状を有する。ケーシング５１の貫通孔は左右方向に延びる。モータ５３はケーシング５１により、ケーシング５１の貫通孔の中心近傍に固定される。モータ５３の回転軸は、左右方向に延びる。ファン５２は、ケーシング５１の貫通孔の内部に配置され、モータ５３によって回転する。 As shown in Figures 4 and 6, blowers 5L and 5R each include a casing 51, a fan 52, and a motor 53. The casing 51 has a rectangular cylindrical shape. A through hole in the casing 51 extends in the left-right direction. The motor 53 is fixed to the casing 51 near the center of the through hole. The rotation shaft of the motor 53 extends in the left-right direction. The fan 52 is disposed inside the through hole in the casing 51 and is rotated by the motor 53.

ファン５２は、回転により気流を発生させる。送風機５Ｌのファン５２により発生する気流は、送風機５Ｌのケーシング５１の貫通孔を右方から左方に通過する。送風機５Ｒのファン５２により発生する気流は、送風機５Ｌのケーシング５１の貫通孔を左方から右方に通過する。 The fan 52 generates an airflow by rotating. The airflow generated by the fan 52 of the blower 5L passes through the through-hole in the casing 51 of the blower 5L from right to left. The airflow generated by the fan 52 of the blower 5R passes through the through-hole in the casing 51 of the blower 5L from left to right.

＜制御基板９＞
図６に示すように、台座３Ｂの下壁３２は着脱可能である。台座３Ｂの内部空間に、制御基板９（メイン基板９Ａ及びＬＥＤ基板９Ｂ）、及びスイッチ９Ｃが収容される。メイン基板９Ａには、制御回路、ＵＳＢコネクタ９０Ａ、及びケーブルコネクタ９０Ｂ等が実装される。ＵＳＢコネクタ９０Ａには、空気清浄機１Ａに電源を供給するためのＵＳＢケーブルが接続される。ＵＳＢコネクタ９０Ａは、台座３Ｂの左側面に設けられた凹部３３から露出する。ケーブルコネクタ９０Ｂには、送風機５Ｌ、５Ｒから延びるケーブル５９が接続される。ＬＥＤ基板９ＢにはＬＥＤが実装される。ＬＥＤは、台座３Ｂの前側面に設けられた貫通孔３４を介して露出する。スイッチ９Ｃはスライドスイッチである。スイッチ９Ｃのつまみ３５Ａは、台座３Ｂの前側面に設けられた貫通孔３５を介して前方に突出する。 <Control board 9>
As shown in FIG. 6 , the bottom wall 32 of the base 3B is removable. The control board 9 (main board 9A and LED board 9B) and switch 9C are housed in the internal space of the base 3B. A control circuit, a USB connector 90A, a cable connector 90B, and the like are mounted on the main board 9A. A USB cable for supplying power to the air purifier 1A is connected to the USB connector 90A. The USB connector 90A is exposed from a recess 33 provided on the left side surface of the base 3B. A cable 59 extending from the fans 5L and 5R is connected to the cable connector 90B. LEDs are mounted on the LED board 9B. The LEDs are exposed through a through-hole 34 provided on the front side surface of the base 3B. The switch 9C is a slide switch. A knob 35A of the switch 9C protrudes forward through a through-hole 35 provided on the front side surface of the base 3B.

＜動作概要＞
ＵＳＢコネクタ９０ＡにＵＳＢケーブルが接続されることによって、空気清浄機１Ａは給電された状態となる。この状態でユーザはつまみ３５Ａを操作し、空気清浄機１Ａによる空気の清浄を開始する。メイン基板９Ａの制御回路は送風機５Ｌ、５Ｒ、より具体的には送風機５Ｌ、５Ｒの各モータ５３を駆動し、夫々のファン５２を回転させる。送風機５Ｌ、５Ｒは気流を発生させる。この気流により、空気清浄機１Ａは、筐体２の上側の吸込口２０Ｕ，前側の吸込口２０Ｆ、後側の吸込口２０Ｓを介して外部から空洞部１０Ｕに空気を吸い込む。吸い込まれた空気は、吸込口２０Ｕ，２０Ｆ、２０Ｓの内側に配置されたフィルタ６０を通過し、清浄される。更に送風機５Ｌ、５Ｒは、空洞部１０Ｕ内の清浄された空気を左方向又は右方向に流す。これにより、清浄された空気は、筐体２の左側の吹出口２２Ｌ、及び右側の吹出口２２Ｒを介して左右外方向に吹き出される。 <Operation overview>
By connecting a USB cable to the USB connector 90A, the air purifier 1A is powered. In this state, the user operates the knob 35A to start purifying the air using the air purifier 1A. The control circuit on the main board 9A drives the blowers 5L and 5R, more specifically, the motors 53 of the blowers 5L and 5R, rotating their respective fans 52. The blowers 5L and 5R generate airflow. This airflow allows the air purifier 1A to draw air from the outside into the cavity 10U through the upper air inlet 20U, the front air inlet 20F, and the rear air inlet 20S of the housing 2. The drawn air passes through the filters 60 located inside the air inlets 20U, 20F, and 20S, where it is purified. The blowers 5L and 5R then direct the purified air within the cavity 10U to the left or right. As a result, the purified air is blown outward in the left and right directions through the left air outlet 22L and the right air outlet 22R of the housing 2.

＜本実施形態の作用、効果＞
空気清浄機１Ａは、フィルタユニット６を装着して使用することで、フィルタ６０により空気を清浄できる。又、空気清浄機１Ａは、使用によりフィルタ６０が汚れたフィルタユニット６を別のフィルタユニット６に交換することにより、空気の清浄機能を維持できる。 <Actions and Effects of This Embodiment>
When the air purifier 1A is used with the filter unit 6 attached, it can purify the air with the filter 60. Furthermore, when the filter unit 6 whose filter 60 becomes dirty through use is replaced with another filter unit 6, the air purifier 1A can maintain its air purification function.

フィルタユニット６は、フィルタ６０の形状を保形する第２保形部材７を有する。第２保形部材７は、フィルタ６０の第２先端部６５Ｆ及び第３先端部６５Ｓの一部に少なくとも設けられる。なお、第２先端部６５Ｆ及び第３先端部６５Ｓは、フィルタ６０のうち蛇腹折りの複数の折り目の方向と直交する方向の端部に対応する。ここで、空気清浄機１Ａにフィルタユニット６が装着された状態で空洞部１０Ｕ内の温度が上昇した場合、フィルタ６０の温度変化により第２先端部６５Ｆ及び第３先端部６５Ｓが変形する可能性がある。しかし、第２保形部材７が設けられることにより、第２先端部６５F及び第３先端部６５Ｓの変形が規制されて、フィルタユニット６は、フィルタ６０の第２先端部６５Ｆ及び第３先端部６５Ｓが使用中に捲れ上がる可能性を軽減できる。従ってフィルタユニット６は、フィルタ６０の変形を低減して空気清浄機１Ａによる空気の清浄機能の低下を抑制できる。 The filter unit 6 has a second shape-retaining member 7 that maintains the shape of the filter 60. The second shape-retaining member 7 is provided on at least a portion of the second tip 65F and third tip 65S of the filter 60. The second tip 65F and third tip 65S correspond to the ends of the filter 60 that are perpendicular to the direction of the accordion-folded folds. If the temperature inside the cavity 10U rises while the filter unit 6 is attached to the air purifier 1A, the second tip 65F and third tip 65S may deform due to the temperature change in the filter 60. However, the provision of the second shape-retaining member 7 restricts deformation of the second tip 65F and third tip 65S, thereby reducing the likelihood of the second tip 65F and third tip 65S of the filter 60 curling up during use. Therefore, the filter unit 6 reduces deformation of the filter 60 and suppresses a decrease in the air purification function of the air purifier 1A.

第２保形部材７は、第２先端部６５Ｆから、第２部６Ｆ、第１部６Ｕ、及び第３部６Ｓを経由して第３先端部６５Ｓに亘って設けられる。このためフィルタユニット６は、第２保形部材７のうちフィルタ６０の第２先端部６５Ｆ及び第３先端部６５Ｓに位置する部分により、第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓに渡って変形が規制されるので、これらの部分が使用中に捲れ上がる可能性を軽減できる。又、フィルタユニット６は、第２保形部材７のうちフィルタ６０の第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓに亘って延びる部分により、第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓの全域で折り目の間隔を維持できる。また、折り目の間隔を維持することで、フィルタ６０が変形して折り目の間隔が詰まるなどの場合と比較して、フィルタ６０による空気清浄の機能を維持できる。 The second shape-retaining member 7 extends from the second tip 65F through the second section 6F, the first section 6U, and the third section 6S to the third tip 65S. Therefore, the portions of the second shape-retaining member 7 located at the second tip 65F and the third tip 65S of the filter 60 restrict deformation across the first section 6U, the second section 6F, and the third section 6S of the filter unit 6, reducing the likelihood of these sections rolling up during use. Furthermore, the portions of the second shape-retaining member 7 extending across the first section 6U, the second section 6F, and the third section 6S of the filter 60 allow the filter unit 6 to maintain the spacing of the folds throughout the first section 6U, the second section 6F, and the third section 6S. Furthermore, maintaining the spacing of the folds helps maintain the air purifying function of the filter 60 compared to when the filter 60 deforms and the spacing of the folds narrows.

第２保形部材７Ａ（図７（Ｂ）参照）は、フィルタ６０Ａの内縁Ｅｉを経由して延びる保形部７１Ａ（図７（Ｂ）参照）を有する。このため第２保形部材７Ａは、フィルタ６０Ａの第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓの夫々の折り目の間隔を、フィルタ６０の内縁Ｅｉで維持できる。蛇腹折りの複数の折り目が形成されたフィルタ基材を折り曲げてＵ字状に成型される際、フィルタ６０Ａの外縁Ｅｏよりも内縁Ｅｉの方が、第２保形部材７Ａを設けやすい。 The second shape-retaining member 7A (see Figure 7(B)) has a shape-retaining portion 71A (see Figure 7(B)) that extends along the inner edge Ei of the filter 60A. Therefore, the second shape-retaining member 7A can maintain the spacing between the folds of the first portion 6U, second portion 6F, and third portion 6S of the filter 60A at the inner edge Ei of the filter 60A. When a filter substrate with multiple accordion-like folds is folded into a U-shape, it is easier to attach the second shape-retaining member 7A to the inner edge Ei of the filter 60A than to the outer edge Eo.

第２保形部材７Ｂ（図７（Ｃ）参照）は、フィルタ６０Ｂの外縁Ｅｏを経由して延びる保形部７１Ｂ（図７（Ｃ）参照）を有する。このため第２保形部材７Ｂは、フィルタ６０Ｂの第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓの夫々の折り目の間隔を、フィルタ６０の外縁Ｅｏで維持できる。蛇腹折りの複数の折り目が形成されたフィルタ基材を加熱してＵ字状に成型しているため、Ｕ字状のフィルタ６０Ｂが加熱（昇温）されると、フィルタ６０Ｂには、応力を解放するように、Ｕ字状から平板状に戻る力が生じる。そのような場合、第２保形部材７Ｂが外縁Ｅｏに設けられると、その戻る力による変形を規制しやすい。 The second shape-retaining member 7B (see FIG. 7(C)) has a shape-retaining portion 71B (see FIG. 7(C)) that extends past the outer edge Eo of the filter 60B. Therefore, the second shape-retaining member 7B can maintain the spacing between the folds of the first portion 6U, second portion 6F, and third portion 6S of the filter 60B at the outer edge Eo of the filter 60B. Because the filter substrate, on which multiple accordion-like folds are formed, is heated and molded into a U-shape, when the U-shaped filter 60B is heated (heated), a force is generated in the filter 60B that causes it to return from its U-shape to a flat plate shape, thereby releasing stress. In such a case, providing the second shape-retaining member 7B at the outer edge Eo makes it easier to restrict deformation due to this returning force.

第２保形部材７Ｃの保形部７１Ａ、７２Ａ（図７（Ｄ）参照）、及び、第２保形部材７Ｄの保形部７１Ｂ、７２Ｂ（図７（Ｅ）参照）は、フィルタ６０の内縁Ｅｉ及び外縁Ｅｏを経由して延びる。このため第２保形部材７Ｃ、７Ｄは、フィルタ６０Ｂの第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓの夫々の折り目の間隔を、フィルタ６０の内縁Ｅｉ及び外縁Ｅｏの両側で維持できる。 The shape-retaining portions 71A and 72A of the second shape-retaining member 7C (see Figure 7(D)) and the shape-retaining portions 71B and 72B of the second shape-retaining member 7D (see Figure 7(E)) extend through the inner edge Ei and outer edge Eo of the filter 60. As a result, the second shape-retaining members 7C and 7D can maintain the spacing between the folds of the first part 6U, second part 6F, and third part 6S of the filter 60B on both sides of the inner edge Ei and outer edge Eo of the filter 60.

第２保形部材７Ｅ、７Ｇは、第２端面６６Ｆに設けられた保形部７３Ａ、及び、第３端面６６Ｓに設けられた保形部７４Ａを有する（図８（Ｂ）（Ｄ）参照）。第２保形部材７Ｆ、７Ｈは、第２端面６６Ｆに設けられた保形部７３Ｂ、及び、第３端面６６Ｓに設けられた保形部７４Ｂを有する（図８（Ｃ）（Ｅ）参照）。第２保形部材７Ｅ～７Ｈは、第２端面６６Ｆ及び第３端面６６Ｓを保形する力を、保形部７３Ａ、７４Ａ、７３Ｂ、７４Ｂにより大きくできる。このため、フィルタユニット６は、第２先端部６５Ｆ及び第３先端部６５Ｓにおけるフィルタ６０の捲れ上がりを、さらに確実に抑制できる。 The second shape-retaining members 7E and 7G have a shape-retaining portion 73A provided on the second end face 66F and a shape-retaining portion 74A provided on the third end face 66S (see Figures 8(B) and 8(D)). The second shape-retaining members 7F and 7H have a shape-retaining portion 73B provided on the second end face 66F and a shape-retaining portion 74B provided on the third end face 66S (see Figures 8(C) and 8(E)). The second shape-retaining members 7E to 7H can increase the force that retains the shape of the second end face 66F and the third end face 66S by using the shape-retaining portions 73A, 74A, 73B, and 74B. As a result, the filter unit 6 can more reliably prevent the filter 60 from curling up at the second tip portion 65F and the third tip portion 65S.

第２保形部材７Ｉ、７Ｊのうち第２端面６６Ｆ及び第３端面６６Ｓに設けられた保形部７３Ａ、７４Ａ、７３Ｂ、７４Ｂは、保形部７１Ａ、７１Ｂ、７２Ａ、７２Ｂよりも左右方向に長い（図９（Ａ）（Ｂ）参照）。つまり、第２保形部材７Ｉ、７Ｊのうち第２先端部６５Ｆ及び第３先端部６５Ｓに位置する部分の左右方向の長さよりも、第２保形部材７Ｉ、７Ｊのうち第２端面６６Ｆ及び第３端面６６Ｓに設けられた部分の左右方向の長さの方が長い。このため、フィルタユニット６は、フィルタ６０の第２端面６６Ｆ及び第３端面６６Ｓにおいて、左右方向のより広い範囲で捲れ上がりを抑制できる。 The shape-retaining portions 73A, 74A, 73B, and 74B provided on the second end face 66F and third end face 66S of the second shape-retaining members 7I and 7J are longer in the left-right direction than the shape-retaining portions 71A, 71B, 72A, and 72B (see Figures 9(A) and 9(B)). In other words, the left-right length of the portions of the second shape-retaining members 7I and 7J provided on the second end face 66F and third end face 66S is longer than the left-right length of the portions of the second shape-retaining members 7I and 7J located at the second tip end 65F and third tip end 65S. Therefore, the filter unit 6 can suppress curling over a wider range in the left-right direction at the second end face 66F and third end face 66S of the filter 60.

フィルタユニット６では、第２保形部材７をホットメルト接着剤又は接着テープにより形成させることができるので、第２保形部材７によるフィルタ６０の形状の保形を、簡易に実現できる。 In the filter unit 6, the second shape-retaining member 7 can be formed using hot melt adhesive or adhesive tape, making it easy to maintain the shape of the filter 60 using the second shape-retaining member 7.

第１保形部材６１は、ユーザによる把持が可能な把持部６１Ｂを有する。このためユーザは、空気清浄機１Ａに対するフィルタユニット６の着脱を、把持部６１Ｂを把持することにより容易に行うことができる。 The first shape-retaining member 61 has a grip portion 61B that can be gripped by the user. This allows the user to easily attach and detach the filter unit 6 to and from the air purifier 1A by gripping the grip portion 61B.

把持部６１Ｂは折り曲げ可能であり、フィルタ６０の第１部６Ｕよりも上方に突出した状態と突出しない状態との間で変形可能である。このため、フィルタユニット６は、空気清浄機１Ａに装着して使用するときに把持部６１Ｂが邪魔になることを抑制できる。 The grip portion 61B is bendable and can be deformed between a state in which it protrudes above the first portion 6U of the filter 60 and a state in which it does not protrude. This prevents the grip portion 61B from getting in the way when the filter unit 6 is attached to the air purifier 1A and used.

第１保形部材６１のうち、左右方向においてフィルタ６０が設けられる側と反対側に、シール部材６２が設けられる。シール部材６２は、フィルタユニット６が空気清浄機１Ａに装着されて使用される場合において、フィルタ６０と区画壁３６Ｌ、３６Ｒとの間の隙間を埋めて密閉できる。これにより、送風機５Ｌ、５Ｒによるフィルタ６０を介した空気の吸引効率を向上させることができる。 A sealing member 62 is provided on the first shape-retaining member 61 on the side opposite in the left-right direction to the side on which the filter 60 is provided. When the filter unit 6 is attached to the air purifier 1A for use, the sealing member 62 fills and seals the gap between the filter 60 and the partition walls 36L, 36R. This improves the efficiency with which the fans 5L, 5R suction air through the filter 60.

フィルタ６０は、第１部６Ｕと第２部６Ｆとを連結する第２屈曲部６０Ｆ、及び、第１部６Ｕと第３部６Ｓとを連結する第３屈曲部６０Ｓを有する。フィルタ６０は、第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓを通過する空気だけでなく、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓを通過する空気も効率よく清浄できる。このため、フィルタユニット６は、第１部６Ｕと第２部６Ｆ、及び、第１部６Ｕと第３部６Ｓが直接連結されている場合と比べて、フィルタ６０による空気の清浄を効率良く行うことができる。 The filter 60 has a second bend 60F connecting the first section 6U and the second section 6F, and a third bend 60S connecting the first section 6U and the third section 6S. The filter 60 can efficiently purify not only the air passing through the first section 6U, the second section 6F, and the third section 6S, but also the air passing through the second bend 60F and the third bend 60S. Therefore, the filter unit 6 can more efficiently purify the air using the filter 60 than when the first section 6U and the second section 6F, and the first section 6U and the third section 6S are directly connected.

第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓにおける蛇腹折りの複数の折り目の間隔ｄ１と、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の内縁Ｅｉに位置する蛇腹折りの複数の折り目の間隔ｄ３とは同一である（ｄ１＝ｄ３）。この場合、フィルタユニット６は、フィルタ６０の第２屈曲部６０Ｆ及び第３屈曲部６０Ｓにおける空気の清浄効果を、第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓと同等にできる。 The spacing d1 between the multiple accordion-folded folds in the first section 6U, second section 6F, and third section 6S is the same as the spacing d3 between the multiple accordion-folded folds located on the inner edge Ei of each of the second bent section 60F and third bent section 60S (d1 = d3). In this case, the filter unit 6 can ensure that the air purification effect at the second bent section 60F and third bent section 60S of the filter 60 is equivalent to that of the first section 6U, second section 6F, and third section 6S.

第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓにおける蛇腹折りの複数の折り目の間隔ｄ１よりも、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の外縁Ｅｏに位置する蛇腹折りの複数の折り目の間隔ｄ２の方が大きい（ｄ１＜ｄ２）。又、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の内縁Ｅｉに位置する蛇腹折りの複数の折り目の間隔ｄ３よりも、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の外縁Ｅｏに位置する蛇腹折りの複数の折り目の間隔ｄ２の方が大きい（ｄ２＞ｄ３）。これらの場合、フィルタユニット６は、フィルタ６０の第２屈曲部６０Ｆ及び第３屈曲部６０Ｓにおける空気の通過性を良好にできるので、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓにおいて空気の清浄効果を良好に維持できる。 The spacing d2 between the multiple accordion-folded folds located at the outer edge Eo of each of the second bent portion 60F and the third bent portion 60S is greater than the spacing d1 between the multiple accordion-folded folds in the first portion 6U, the second portion 6F, and the third portion 6S (d1 < d2). Furthermore, the spacing d2 between the multiple accordion-folded folds located at the outer edge Eo of each of the second bent portion 60F and the third bent portion 60S is greater than the spacing d3 between the multiple accordion-folded folds located at the inner edge Ei of each of the second bent portion 60F and the third bent portion 60S (d2 > d3). In these cases, the filter unit 6 can improve air permeability at the second bent portion 60F and the third bent portion 60S of the filter 60, thereby maintaining good air purification effects at the second bent portion 60F and the third bent portion 60S.

＜変形例＞
本発明は種々の変更が可能である。空気清浄機１Ａの送風機５は、筐体２の前壁３Ｆ、後壁３Ｓ、上壁３Ｕの少なくとも何れかに設けられてもよい。この場合、フィルタ６０の第１部６Ｕ、第２部６Ｆ、第３部６Ｓの少なくとも何れかと送風機５とが対向して配置され、フィルタユニット６は送風機５Ｌ、５Ｒの間に配置されない。フィルタユニット６は、空気清浄機１Ａに対して固定され、着脱不能であってもよい。 <Modification>
The present invention can be modified in various ways. The blower 5 of the air purifier 1A may be provided on at least one of the front wall 3F, rear wall 3S, and top wall 3U of the housing 2. In this case, at least one of the first section 6U, second section 6F, and third section 6S of the filter 60 is disposed opposite the blower 5, and the filter unit 6 is not disposed between the blowers 5L and 5R. The filter unit 6 may be fixed to the air purifier 1A and not detachable.

フィルタ６０の第２部６Ｆ及び第３部６Ｓの夫々の延びる方向は、上下方向に対して傾斜していてもよい。例えば第２部６Ｆは、第２屈曲部６０Ｆの下端部から前斜め下方に延びてもよく、第３部６Ｓは、第３屈曲部６０Ｓの下端部から後斜め下方に延びてもよい。
第２部６Ｆと第３部６Ｓとの間の前後方向の間隔は、下方に向かうに従って徐々に大きくなっていてもよい。又、例えば第２部６Ｆは、第２屈曲部６０Ｆの下端部から後斜め下方に延びてもよく、第３部６Ｓは、第３屈曲部６０Ｓの下端部から前斜め下方に延びてもよい。第２部６Ｆと第３部６Ｓとの間の前後方向の間隔は、下方に向かうに従って徐々に小さくなっていてもよい。 The extending direction of each of the second portion 6F and the third portion 6S of the filter 60 may be inclined with respect to the up-down direction. For example, the second portion 6F may extend obliquely downward and forward from the lower end of the second bent portion 60F, and the third portion 6S may extend obliquely downward and rearward from the lower end of the third bent portion 60S.
The distance in the front-rear direction between the second portion 6F and the third portion 6S may gradually increase as the distance decreases. Alternatively, for example, the second portion 6F may extend diagonally downward and rearward from the lower end of the second bent portion 60F, and the third portion 6S may extend diagonally downward and frontward from the lower end of the third bent portion 60S. The distance in the front-rear direction between the second portion 6F and the third portion 6S may gradually decrease as the distance decreases.

図１０（Ａ）（Ｂ）に示す第２保形部材７Ｋは、図８（Ｂ）に示す保形部７１Ａの代わりに保形部７６Ａ、７６Ｂを有するという点で、第２保形部材７Ｅと相違する。保形部７６Ａは、内縁Ｅｉのうち第２先端部６５Ｆの近傍にのみ設けられる。保形部７６Ｂは、内縁Ｅｉのうち第３先端部６５Ｓの近傍にのみ設けられる。又、図１０（Ａ）（Ｃ）に示す第２保形部材７Ｌは、図８（Ｃ）に示す保形部７１Ｂの代わりに保形部７７Ａ、７７Ｂを有するという点で、第２保形部材７Ｆと相違する。保形部７７Ａは、外縁Ｅｏのうち第２先端部６５Ｆの近傍にのみ設けられる。保形部７７Ｂは、外縁Ｅｏのうち第３先端部６５Ｓの近傍にのみ設けられる。 The second shape-retaining member 7K shown in Figures 10(A) and (B) differs from the second shape-retaining member 7E in that it has shape-retaining portions 76A and 76B instead of the shape-retaining portion 71A shown in Figure 8(B). The shape-retaining portion 76A is provided only near the second tip 65F of the inner edge Ei. The shape-retaining portion 76B is provided only near the third tip 65S of the inner edge Ei. Furthermore, the second shape-retaining member 7L shown in Figures 10(A) and (C) differs from the second shape-retaining member 7F in that it has shape-retaining portions 77A and 77B instead of the shape-retaining portion 71B shown in Figure 8(C). The shape-retaining portion 77A is provided only near the second tip 65F of the outer edge Eo. The shape-retaining portion 77B is provided only near the third tip 65S of the outer edge Eo.

図１０に示すように、第２保形部材７は、内縁Ｅｉ及び外縁Ｅｏのうち第２先端部６５Ｆ及び第３先端部６５Ｓの近傍にのみ設けられていてもよく、内縁Ｅｉ及び外縁Ｅｏの全域に亘って設けられていなくてもよい。例えば第２保形部材７は、フィルタ６０の第２部６Ｆ及び第３部６Ｓの内縁Ｅｉ及び外縁Ｅｏの少なくとも一方にのみ設けられ、第１部６Ｕの内縁Ｅｉ及び外縁Ｅｏに設けられなくてもよい。 As shown in FIG. 10, the second shape-retaining member 7 may be provided only near the second tip 65F and third tip 65S of the inner edge Ei and outer edge Eo, and may not be provided over the entire inner edge Ei and outer edge Eo. For example, the second shape-retaining member 7 may be provided only on at least one of the inner edge Ei and outer edge Eo of the second part 6F and third part 6S of the filter 60, and may not be provided on the inner edge Ei or outer edge Eo of the first part 6U.

図１１（Ａ）に示す第２保形部材７Ｍは、保形部７８Ａ、７８Ｂを有する。保形部７８Ａは、フィルタ６０Ａの第２先端部６５Ｆと、第２先端部６５Ｆに対して上方に近接する蛇腹折りの折り目（以下、「第２近接折り目６５Ｐ」という。）との間に設けられ、夫々を連結する。保形部７８Ｂは、フィルタ６０Ａの第３先端部６５Ｓと、第３先端部６５Ｓに対して上方に近接する蛇腹折りの折り目（以下、「第３近接折り目６５Ｑ」という。）との間に設けられ、夫々を連結する。保形部７８Ａ、７８Ｂは、フィルタ６０Ａの内縁Ｅｉに沿って配置される。 The second shape-retaining member 7M shown in FIG. 11(A) has shape-retaining portions 78A and 78B. Shape-retaining portion 78A is provided between the second tip portion 65F of the filter 60A and the accordion-folded fold adjacent to and above the second tip portion 65F (hereinafter referred to as the "second nearest fold 65P"), connecting them together. Shape-retaining portion 78B is provided between the third tip portion 65S of the filter 60A and the accordion-folded fold adjacent to and above the third tip portion 65S (hereinafter referred to as the "third nearest fold 65Q"), connecting them together. Shape-retaining portions 78A and 78B are arranged along the inner edge Ei of the filter 60A.

図１１（Ｂ）に示す第２保形部材７Ｎは、保形部７９Ａ、７９Ｂを有する。保形部７９Ａは、フィルタ６０Ｂの第２先端部６５Ｆと第２近接折り目６５Ｐとの間に設けられ、夫々を連結する。保形部７８Ｂは、フィルタ６０Ｂの第３先端部６５Ｓと第３近接折り目６５Ｑとの間に設けられ、夫々を連結する。保形部７９Ａ、７９Ｂは、フィルタ６０Ｂの外縁Ｅｏに沿って配置される。図１１（Ａ）（Ｂ）いずれの場合も、第２先端部６５Ｆと第２近接折り目６５Ｐとの間の間隔、及び、第３先端部６５Ｓと第３近接折り目６５Ｑとの間の間隔は、間隔ｄ１（図５参照）よりも小さい。 The second shape-retaining member 7N shown in Figure 11(B) has shape-retaining portions 79A and 79B. Shape-retaining portion 79A is provided between the second tip portion 65F and the second proximal fold 65P of the filter 60B, connecting them. Shape-retaining portion 78B is provided between the third tip portion 65S and the third proximal fold 65Q of the filter 60B, connecting them. Shape-retaining portions 79A and 79B are arranged along the outer edge Eo of the filter 60B. In both Figures 11(A) and (B), the distance between the second tip portion 65F and the second proximal fold 65P and the distance between the third tip portion 65S and the third proximal fold 65Q are smaller than distance d1 (see Figure 5).

図１１（Ａ）（Ｂ）において、第２先端部６５Ｆと第２近接折り目６５Ｐとの夫々の位置は一致してもよい。つまり、第２保形部材７Ｍの保形部７８Ａ、７８Ｂは、第２先端部６５Ｆと第２近接折り目６５Ｐとを接着してもよい。同様に、第２保形部材７Ｎの保形部７９Ａ、７９Ｂは、第２先端部６５Ｆと第２近接折り目６５Ｐとを接着してもよい。 In Figures 11(A) and 11(B), the positions of the second tip portion 65F and the second adjacent fold 65P may coincide. In other words, the shape retaining portions 78A and 78B of the second shape retaining member 7M may bond the second tip portion 65F and the second adjacent fold 65P. Similarly, the shape retaining portions 79A and 79B of the second shape retaining member 7N may bond the second tip portion 65F and the second adjacent fold 65P.

第２保形部材７の材料は、ホットメルト接着剤及び接着テープに限らず、他の材料が用いられてもよい。第２保形部材７は、フィルタ６０のうち隣接する蛇腹折りの複数の山折りの折り目どうし、又は、隣接する蛇腹折りの複数の谷折りの折り目どうしを連結する場合に限定されない。例えば第２保形部材７は、蛇腹折り形状を有するフィルタ６０において折り目に亘って延びる部分（稜線部）のうち、相対する稜線部どうしを、接着剤により接着することで形成されてもよい。 The material of the second shape-retaining member 7 is not limited to hot melt adhesive or adhesive tape, and other materials may be used. The second shape-retaining member 7 is not limited to connecting multiple mountain folds of adjacent accordion folds in the filter 60, or multiple valley folds of adjacent accordion folds. For example, the second shape-retaining member 7 may be formed by adhesively bonding opposing ridge portions of the accordion-folded filter 60 that extend across the folds (ridge portions).

把持部６１Ｂは、第１保形部材６１とは別の部材に設けられてもよい。例えば把持部６１Ｂはフィルタ６０に直接設けられてもよいし、シール部材６２に設けられてもよい。把持部６１Ｂは、フィルタ６０に対して上下方向にスライド移動可能であってもよい。第１保形部材６１は弾性変形可能でもよく、フィルタ６０と区画壁３６Ｌ、３６Ｒとの間の隙間を埋めて密閉する機能を有してもよい。この場合、シール部材６２は設けられなくてもよい。 The gripping portion 61B may be provided on a member separate from the first shape-retaining member 61. For example, the gripping portion 61B may be provided directly on the filter 60, or on the sealing member 62. The gripping portion 61B may be able to slide up and down relative to the filter 60. The first shape-retaining member 61 may be elastically deformable and may have the function of filling and sealing the gap between the filter 60 and the partition walls 36L, 36R. In this case, the sealing member 62 may not be provided.

フィルタ６０は、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓを有さなくてもよい。この場合、第２部６Ｆは第１部６Ｕの前端部に直接連結してもよいし、第３部６Ｓは第１部６Ｕの後端部に直接連結してもよい。この場合、第１部６Ｕと第２部６Ｆとの間のなす角度、及び、第１部６Ｕと第３部６Ｓとの間のなす角度は、直角であってもよい。第１部６Ｕは、上方に向けて凸状に湾曲してもよい。 The filter 60 may not have the second bent portion 60F and the third bent portion 60S. In this case, the second portion 6F may be directly connected to the front end of the first portion 6U, and the third portion 6S may be directly connected to the rear end of the first portion 6U. In this case, the angle between the first portion 6U and the second portion 6F and the angle between the first portion 6U and the third portion 6S may be a right angle. The first portion 6U may be curved convexly upward.

第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓにおける蛇腹折りの複数の折り目の間隔ｄ１と、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の外縁Ｅｏに位置する蛇腹折りの複数の折り目の間隔ｄ２とが同一であってもよい（ｄ１＝ｄ２）。第１部６Ｕ、第２部６Ｆ、及び第３部６Ｓにおける蛇腹折りの複数の折り目の間隔ｄ１よりも、第２屈曲部６０Ｆ及び第３屈曲部６０Ｓの夫々の内縁Ｅｉに位置する蛇腹折りの複数の折り目の間隔ｄ３の方が小さくてもよい（ｄ１＞ｄ２）。第２屈曲部６０Ｆ及び第３屈曲部６０Ｓは蛇腹折り形状を有さなくてもよい。例えば第２屈曲部６０Ｆ及び第３屈曲部６０Ｓは、屈曲した平面状であってもよい。 The spacing d1 between the multiple accordion-folded folds in the first section 6U, the second section 6F, and the third section 6S may be the same as the spacing d2 between the multiple accordion-folded folds located at the outer edge Eo of each of the second bent section 60F and the third bent section 60S (d1 = d2). The spacing d3 between the multiple accordion-folded folds located at the inner edge Ei of each of the second bent section 60F and the third bent section 60S may be smaller than the spacing d1 between the multiple accordion-folded folds in the first section 6U, the second section 6F, and the third section 6S (d1 > d2). The second bent section 60F and the third bent section 60S do not have to have an accordion-folded shape. For example, the second bent section 60F and the third bent section 60S may be curved and planar.

第２保形部材７は、フィルタ６０のうち左右方向において異なる複数の位置に設けられてもよい。具体的には、例えば図８に示す第２保形部材７Ｅ～７Ｈは、フィルタ６０を左右方向に４等分する３本の４等分線の夫々の位置に設けられてもよい。 The second shape-retaining members 7 may be provided at multiple different positions on the filter 60 in the left-right direction. Specifically, for example, the second shape-retaining members 7E to 7H shown in Figure 8 may be provided at each of the three quadrants that divide the filter 60 into four equal parts in the left-right direction.

図１２を参照し、変形例における空気清浄機１Ｂについて説明する。空気清浄機１Ｂは、蓋３１の左端４０に把持部４１が設けられる点で、空気清浄機１Ａと相違する。把持部４１を前後方向に直交する平面で切った断面形状（拡大領域Ｗで示される形状）は、上方に開口するＵ字状を有し、一端４１１から他端４１２まで延びる。一端４１１は、蓋３１の左端４０において前後方向の中央部に接続する。他端４１２は一端４１１よりも上方まで延び、左上壁３１Ｌよりも上方に延びる。 Referring to Figure 12, a modified air purifier 1B will be described. Air purifier 1B differs from air purifier 1A in that a grip portion 41 is provided at the left end 40 of the lid 31. The cross-sectional shape of the grip portion 41 taken along a plane perpendicular to the front-to-rear direction (the shape shown in enlarged area W) is U-shaped and opens upward, extending from one end 411 to the other end 412. One end 411 connects to the center in the front-to-rear direction at the left end 40 of the lid 31. The other end 412 extends higher than one end 411 and higher than the upper left wall 31L.

把持部４１において他端４１２の下側の位置には係止片４１３が設けられる。係止片４１３は把持部４１において他端４１２の下側の位置から左方に突出する。把持部４１は、他端４１２が一端４１１に対して近づき又は離れるように左右方向に弾性変形できる。把持部４１はスナップフィットであり、係止片４１３が左上壁３１Ｌの下側に係合することで、蓋３１が筐体２に取り付けられた状態が維持される。一方、ユーザが把持部４１の他端４１２を一端４１１に近づくように右方に押し付けることにより、係止片４１３と左上壁３１Ｌとの係合が解除される。この状態でユーザは把持部４１を上方に持ち上げることにより、筐体２から蓋３１を取り外すことができる。 A locking piece 413 is provided on the gripping portion 41 below the other end 412. The locking piece 413 protrudes to the left from a position below the other end 412 of the gripping portion 41. The gripping portion 41 can elastically deform left and right so that the other end 412 moves toward or away from the one end 411. The gripping portion 41 is snap-fit, and the locking piece 413 engages with the underside of the upper left wall 31L, maintaining the lid 31 attached to the housing 2. On the other hand, when the user presses the other end 412 of the gripping portion 41 to the right so that it moves toward the one end 411, the locking piece 413 disengages from the upper left wall 31L. In this state, the user can remove the lid 31 from the housing 2 by lifting the gripping portion 41 upward.

又、変形例における空気清浄機１Ｂは、ルーバ２３の代わりにルーバ８が設けられる点で、空気清浄機１Ａと相違する。図１２に示すように、ルーバ８は吹出口２２Ｌ、２２Ｒ（図４参照）に嵌る。ルーバ８は、枠８１、複数の枠８２、複数の羽板８３、及び複数の閉塞板８４を備える。枠８１は左側面視で吹出口２２Ｌ、２２Ｒの形状と同じ形状を有し、本変形例では矩形状を有する。 Furthermore, air purifier 1B in this modified example differs from air purifier 1A in that louvers 8 are provided instead of louvers 23. As shown in FIG. 12, louvers 8 fit into air outlets 22L, 22R (see FIG. 4). Louvers 8 include a frame 81, multiple frames 82, multiple blades 83, and multiple closure plates 84. Frame 81 has the same shape as air outlets 22L, 22R when viewed from the left side, and is rectangular in this modified example.

複数の枠８２は枠８１内において上下方向に延び、左右方向に並ぶ。複数の羽板８３は枠８１内において左右方向に延び、上下方向に並ぶ。羽板８３は上方から下方に向かうにつれて、左右方向の内側から外側に向かって延びる。ルーバ８には枠８１内において複数の枠８２と複数の羽板８３によって複数の開口８５が形成される。閉塞板８４は複数の開口８５のうち、四隅の開口８５と、中央部の開口８５に設けられる。このため、ユーザは筐体２の左右両側から筐体２の内部を視認できない。ルーバ８は、複数の羽板８３によって、筐体２の内部から外部に向けて流れる空気の向きを、左右方向に対して下側に傾斜した方向に案内する。 The multiple frames 82 extend vertically within the frame 81 and are aligned horizontally. The multiple blades 83 extend horizontally within the frame 81 and are aligned vertically. The blades 83 extend from the inside to the outside in the horizontal direction as they extend from top to bottom. The multiple frames 82 and blades 83 form multiple openings 85 in the frame 81 in the louver 8. Blocking plates 84 are provided at the openings 85 at the four corners and the central opening 85. This prevents the user from viewing the inside of the housing 2 from either the left or right side of the housing 2. The louver 8 uses the multiple blades 83 to guide the air flowing from the inside to the outside of the housing 2 in a direction that is inclined downward relative to the horizontal direction.

＜その他＞
前後方向は、本発明の「第１方向」の一例である。前側は、本発明の「第１方向の一方側」の一例である。後側は、本発明の「第１方向の他方側」の一例である。上下方向は、本発明の「第２方向」「第３方向」「直交方向」の一例である。下側は、本発明の「第２方向の一方側」「第３方向の一方側」「直交方向の一方側」の一例である。上側は、本発明の「第２方向の他方側」「第３方向の他方側」「直交方向の他方側」の一例である。左右方向は、本発明の「折り目方向」の一例である。シール部材６２は、本発明の「弾性部材」の一例である。 <Others>
The front-to-rear direction is an example of the "first direction" of the present invention. The front side is an example of the "one side of the first direction" of the present invention. The rear side is an example of the "other side of the first direction" of the present invention. The up-down direction is an example of the "second direction,""thirddirection," or "orthogonal direction" of the present invention. The bottom side is an example of the "one side of the second direction,""one side of the third direction," or "one side of the orthogonal direction" of the present invention. The top side is an example of the "other side of the second direction,""other side of the third direction," or "other side of the orthogonal direction" of the present invention. The left-to-right direction is an example of the "fold direction" of the present invention. The sealing member 62 is an example of the "elastic member" of the present invention.

１Ａ：空気清浄機
２：筐体
５、５Ｌ、５Ｒ：送風機
６：フィルタユニット
６Ｆ：第２部
６Ｓ：第３部
６Ｕ：第１部
７、７Ａ、７Ｂ、７Ｃ、７Ｄ、７Ｅ、７Ｆ、７Ｇ、７Ｈ、７Ｉ、７Ｊ、７Ｋ、７Ｌ、７Ｍ、７Ｎ：第２保形部材
１０：空洞部
３１：蓋
６０、６０Ａ、６０Ｂ：フィルタ
６０Ｆ：第２屈曲部
６０Ｓ：第３屈曲部
６１：第１保形部材
６２：シール部材
６５Ｆ：第２先端部
６５Ｍ：第２隣接折り目
６５Ｐ：第２近接折り目
６６Ｆ：第２端面
６５Ｓ：第３先端部
６５Ｎ：第３隣接折り目
６５Ｑ：第３近接折り目
６６Ｓ：第３端面 1A: Air purifier 2: Housing 5, 5L, 5R: Blower 6: Filter unit 6F: Second section 6S: Third section 6U: First section 7, 7A, 7B, 7C, 7D, 7E, 7F, 7G, 7H, 7I, 7J, 7K, 7L, 7M, 7N: Second shape-retaining member 10: Hollow section 31: Lids 60, 60A, 60B: Filter 60F: Second bent section 60S: Third bent section 61: First shape-retaining member 62: Sealing member 65F: Second tip portion 65M: Second adjacent fold 65P: Second proximal fold 66F: Second end surface 65S: Third tip portion 65N: Third adjacent fold 65Q: Third proximal fold 66S: Third end surface

Claims

A filter having an accordion-like shape,
a first portion; a second portion extending from an end of the first portion on one side in a first direction to one side in a second direction intersecting with the first direction; and a third portion extending from an end of the first portion on the other side in the first direction to one side in a third direction intersecting with the first direction,
the first portion and the second portion are connected via a second bent portion,
the first portion and the third portion are connected via a third bent portion,
the second bent portion and the third bent portion have inner edges close to a center of curvature and outer edges spaced apart from the center of curvature,
A fold direction, which is a direction in which the accordion-folded folds of each of the first part, the second part, and the third part extend, is perpendicular to the first direction, the second direction, and the third direction;
an interval between the plurality of accordion-folded folds in the first portion, an interval between the plurality of accordion-folded folds in the second portion, an interval between the plurality of accordion-folded folds in the third portion, and an interval between the plurality of accordion-folded folds located on the inner edge of each of the second bent portion and the third bent portion are the same;
an interval between the plurality of accordion-folded folds located at the outer edge of each of the second bent portion and the third bent portion is larger than an interval between the plurality of accordion-folded folds in the first portion, an interval between the plurality of accordion-folded folds in the second portion, and an interval between the plurality of accordion-folded folds in the third portion;
the filter;
a first shape-retaining member that is bonded to both ends of the filter in the fold direction and that retains the shape of the filter so as to maintain the plurality of accordion-folded folds;
A filter unit characterized by comprising a second shape-retaining member provided at each of a second tip portion, which is an end portion on one side in the second direction of the second part, and a third tip portion, which is an end portion on one side in the third direction of the third part, and extending in the fold direction.

A filter unit as described in claim 1, characterized in that the length of the second shape-retaining member in the fold direction is the same as the length of the filter.

The filter unit described in claim 1, characterized in that the first shape-retaining member is a thin plate-like member made of nonwoven fabric.

The filter unit described in claim 1, characterized in that the first shape-retaining member has the same cross-sectional shape as the filter.