JP5603216B2 - Dust collector - Google Patents

Dust collector Download PDF

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Publication number
JP5603216B2
JP5603216B2 JP2010267462A JP2010267462A JP5603216B2 JP 5603216 B2 JP5603216 B2 JP 5603216B2 JP 2010267462 A JP2010267462 A JP 2010267462A JP 2010267462 A JP2010267462 A JP 2010267462A JP 5603216 B2 JP5603216 B2 JP 5603216B2
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Prior art keywords
filter
tank
support frame
dust collector
dust
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JP2012115443A5 (en
JP2012115443A (en
Inventor
祐樹 水越
洋一 阪口
芳宜 佐々木
周祐 伊藤
学 徳永
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Makita Corp
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Makita Corp
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Priority to JP2010267462A priority Critical patent/JP5603216B2/en
Priority to PCT/JP2011/070973 priority patent/WO2012073576A1/en
Priority to CN201190000895.9U priority patent/CN203539240U/en
Publication of JP2012115443A publication Critical patent/JP2012115443A/en
Publication of JP2012115443A5 publication Critical patent/JP2012115443A5/ja
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/20—Means for cleaning filters
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/102—Dust separators
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/12—Dry filters
    • A47L9/125—Dry filters funnel-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/66—Regeneration of the filtering material or filter elements inside the filter
    • B01D46/74—Regeneration of the filtering material or filter elements inside the filter by forces created by movement of the filter element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2275/20—Shape of filtering material
    • B01D2275/203—Shapes flexible in their geometry, e.g. bendable, adjustable to a certain size

Description

本発明は、吸込口を有するタンクの上方に、モータ及び吸込ファンを備えた吸気ユニットを有する本体を載置して、タンク内で吸込口と本体との間に可撓性のフィルタを介在させた集塵機に関する。   In the present invention, a main body having an intake unit having a motor and a suction fan is placed above a tank having a suction port, and a flexible filter is interposed between the suction port and the main body in the tank. Relates to a dust collector.

集塵機は、吸込口を有するタンクの上方に、モータ及び吸込ファンを備えた吸気ユニットを有する本体を載置して、タンク内で吸込口と本体との間に、タンク内へ膨出する布製や紙製の可撓性のフィルタを介在させている。すなわち、モータの駆動で吸込ファンが回転すると、吸込口に接続したホースを介して外気がタンク内に吸い込まれ、吸気ユニットを通って外部へ排出されることで、外気と共にタンク内に吸い込まれた塵埃がフィルタに捕捉されてタンク内に集塵されるものである。吸気ユニットには、特許文献１に示すように、袋状のフィルタの内部に位置して吸引時のフィルタの形状を安定させる支持枠が設けられている。
しかし、このような集塵機においては、粉塵がフィルタに付着して目詰まりし、吸引力が低下する問題があることから、特許文献２には、支持枠を剛鋼線とバネ鋼板とで形成する発明が開示されている。この支持枠（フィルタケージ）は、運転時に目詰まりしたフィルタによって下流側が負圧になると内側へ弾性変形し、運転が停止すると、バネ力によって元の形状へ復帰し、その勢いでフィルタを収縮状態から膨出状態に復帰させて付着した粉塵を自動的に払い落とすようにしたものである。 The dust collector has a main body having an intake unit equipped with a motor and a suction fan above a tank having a suction port, and is made of a cloth that swells into the tank between the suction port and the main body in the tank. A paper flexible filter is interposed. That is, when the suction fan is rotated by driving the motor, the outside air is sucked into the tank through the hose connected to the suction port, and is sucked into the tank together with the outside air by being discharged outside through the intake unit. Dust is captured by the filter and collected in the tank. As shown in Patent Document 1, the intake unit is provided with a support frame that is positioned inside a bag-like filter and stabilizes the shape of the filter during suction.
However, in such a dust collector, there is a problem that dust adheres to the filter and becomes clogged, and the suction force is reduced. Therefore, in Patent Document 2, a support frame is formed of a rigid steel wire and a spring steel plate. The invention is disclosed. This support frame (filter cage) is elastically deformed inward when the downstream side becomes negative pressure due to the filter clogged during operation, and when the operation stops, it returns to its original shape by the spring force, and the filter contracts with that force The dust that has returned to the bulging state from the spilled state is automatically removed.

実公昭５５−１２７５４号公報Japanese Utility Model Publication No.55-12754 特開２００２−４５３１８号公報JP 2002-45318 A

ところが、特許文献２の支持枠は、全体がカゴ状に形成されているため、弾性変形の変化率が小さく、ひいてはフィルタの収縮から膨出への変形量も小さくなって塵落とし効果が十分とは言えない。また、支持枠を弾性変形させるために鋼線と鋼板とを併用する必要があって製造に係る手間やコストもかさむことになる。   However, since the entire support frame of Patent Document 2 is formed in a cage shape, the rate of change in elastic deformation is small, and the amount of deformation from contraction to bulging of the filter is also small, and the dust removal effect is sufficient. I can't say that. Moreover, in order to elastically deform the support frame, it is necessary to use a steel wire and a steel plate in combination, which increases the labor and cost for manufacturing.

そこで、本発明は、支持枠を弾性変形させることなく運転から運転停止に伴うフィルタの収縮から膨出への変形量を大きくして、フィルタの好適な塵落とし効果が得られる集塵機を提供することを目的としたものである。   Accordingly, the present invention provides a dust collector capable of increasing the amount of deformation from contraction to bulging of the filter that accompanies operation stoppage without causing elastic deformation of the support frame, thereby obtaining a suitable dust removal effect of the filter. It is aimed at.

上記目的を達成するために、請求項１に記載の発明は、フィルタ内に、モータが駆動して吸込ファンが回転するとフィルタの収縮変形と共に上方に移動し、モータが停止すると自重により下方に移動してフィルタをタンク内への膨出形状に付勢する付勢手段を設けたことを特徴とするものである。
請求項２に記載の発明は、請求項１の構成において、付勢手段は、フィルタ内の底部に設けられる錘であることを特徴とするものである。
In order to achieve the above object, according to the first aspect of the present invention , when the motor is driven and the suction fan rotates in the filter, the filter moves upward along with the contraction and deformation of the filter, and when the motor stops, it moves downward due to its own weight. Thus , an urging means for urging the filter into a bulging shape into the tank is provided.
According to a second aspect of the present invention, in the configuration of the first aspect, the urging means is a weight provided at the bottom of the filter .

本発明によれば、フィルタの好適な塵落とし効果が得られる。
According to the present invention, a suitable dust removing effect of the filter can be obtained.

集塵機の斜視図である。It is a perspective view of a dust collector. 集塵機の分解斜視図である。It is a disassembled perspective view of a dust collector. タンク内でのプレフィルタの状態を示す説明図である（運転停止状態）。It is explanatory drawing which shows the state of the pre filter in a tank (operation stop state). タンク内でのプレフィルタの状態を示す説明図である（運転状態）。It is explanatory drawing which shows the state of the pre filter in a tank (operation state).

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、集塵機の一例を示す斜視図、図２はその分解斜視図で、この集塵機１は、上面を開口したタンク２の上方に、吸気ユニット４を内蔵した本体３を設けてなる。吸気ユニット４は、タンク２の開口を閉塞して本体３を支持するタンクカバー５によってタンク２の中央上方から吊り下げ支持されており、内部に、図示しないモータとそのモータ駆動で回転する吸込ファンとを内蔵して、下面中央に吸気口６を開口させている。本体３の上部側面には、運転スイッチ７と吸引力の切替スイッチ８とが設けられ、本体３の上部中央にはハンドル９が設けられている。また、タンク２の側面には、ホースやノズル等を接続する吸込口１０が設けられると共に、タンクカバー５の外縁に係止して開口を閉塞させるフック１１，１１が設けられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a dust collector, and FIG. 2 is an exploded perspective view thereof. The dust collector 1 is provided with a main body 3 containing an intake unit 4 above a tank 2 having an upper surface opened. The intake unit 4 is suspended and supported from above the center of the tank 2 by a tank cover 5 that closes the opening of the tank 2 and supports the main body 3, and includes a motor (not shown) and a suction fan that rotates by driving the motor. And an intake port 6 is opened at the center of the lower surface. An operation switch 7 and a suction force changeover switch 8 are provided on the upper side surface of the main body 3, and a handle 9 is provided in the upper center of the main body 3. Further, a suction port 10 for connecting a hose, a nozzle or the like is provided on the side surface of the tank 2, and hooks 11, 11 that are locked to the outer edge of the tank cover 5 and close the opening are provided.

図２に示すように、タンク２と本体３との間には、吸気口６の周囲及び下方を覆うメインフィルタ１２が設けられている。このメインフィルタ１２は、タンク２の開口に係止されるリング状の上係止部１３と、その上係止部１３から下方へ連設され、下方へ行くに従って小径となるテーパ状のフィルタ部１４とからなる。フィルタ部１４は、底面を除く側面全周がフィルタとなっている。   As shown in FIG. 2, a main filter 12 is provided between the tank 2 and the main body 3 to cover the periphery and the lower side of the intake port 6. The main filter 12 includes a ring-shaped upper locking portion 13 that is locked to the opening of the tank 2, and a tapered filter portion that is continuously provided downward from the upper locking portion 13 and decreases in diameter as it goes downward. 14 and. The filter portion 14 is a filter on the entire side surface except the bottom surface.

また、メインフィルタ１２には、上支持枠として、フィルタ部１４の形状に合わせてその側面全周を外側から覆うテーパ筒状の網体１５が設けられると共に、メインフィルタ１２の下面中央には、支持枠１６が設けられている。この支持枠１６は、上端中央がメインフィルタ１２の下面に連結されて下端が開口する下向きカップ状で、周方向に所定間隔をおいて放射方向且つ下向きにカーブする複数の縦材１７，１７・・と、その縦材１７に沿って上下方向に所定間隔をおいて固定され、下方へ行くに従って徐々に大径となる複数の円形の横材１８，１８・・との２種類の線材で形成されている。   Further, the main filter 12 is provided with a tapered cylindrical mesh body 15 as an upper support frame that covers the entire circumference of the side surface from the outside in accordance with the shape of the filter portion 14. A support frame 16 is provided. The support frame 16 has a downward cup shape in which the center of the upper end is connected to the lower surface of the main filter 12 and the lower end is opened, and a plurality of vertical members 17, 17. .. And a plurality of circular cross members 18, 18... Which are fixed at predetermined intervals in the vertical direction along the vertical member 17 and gradually increase in diameter as going downward. Has been.

そして、１９は本発明のフィルタとしてのプレフィルタで、メインフィルタ１２の上係止部の下側でタンク２の開口に係止されるリング状の下係止部２０と、その下係止部２０から下方へ連設され、下方へ行くに従って小径となるテーパ状のフィルタ部２１とからなる。このフィルタ部２１は、可撓性を有する布製又は紙製の有底筒で、メインフィルタ１２と共にタンク２の開口へ係止させた状態では、図３に示すように、網体５及び支持枠１６を含むメインフィルタ１２の全体を下側から覆ってタンク２内に膨出するようになっている。プレフィルタ１９の底面中央には、付勢手段としての錘２２が取り付けられて、常態ではタンク２内への膨出状態を維持している。   Reference numeral 19 denotes a pre-filter as a filter of the present invention, a ring-shaped lower locking portion 20 that is locked to the opening of the tank 2 below the upper locking portion of the main filter 12, and its lower locking portion. The taper-shaped filter part 21 is provided continuously from 20 and decreases in diameter as it goes downward. The filter portion 21 is a bottomed tube made of cloth or paper having flexibility. When the filter portion 21 is locked to the opening of the tank 2 together with the main filter 12, as shown in FIG. The entire main filter 12 including 16 is covered from below and bulges into the tank 2. A weight 22 as an urging means is attached to the center of the bottom surface of the pre-filter 19 and maintains a bulging state into the tank 2 in a normal state.

以上の如く構成された集塵機１においては、運転スイッチ７のＯＮ操作でモータが駆動して吸込ファンが回転すると、吸込口１０に接続したホース等を介して外気がタンク２内に吸引され、プレフィルタ１９及びメインフィルタ１２を通過して吸気口６から吸気ユニット４内に吸い込まれて、吸込ファンから図示しない送気路へ送られ、図示しない排気口から排出されるものとなる。これにより、外気と共にタンク２内に吸引された塵埃がまずプレフィルタ１９のフィルタ部２１に捕捉され、プレフィルタ１９を通過した細かい粉塵はメインフィルタ１２のフィルタ部１４に捕捉されることになる。   In the dust collector 1 configured as described above, when the motor is driven by the ON operation of the operation switch 7 and the suction fan rotates, outside air is sucked into the tank 2 through a hose connected to the suction port 10 and the like. The air passes through the filter 19 and the main filter 12 and is sucked into the intake unit 4 from the intake port 6 and is sent from the intake fan to an air supply path (not shown) and discharged from an exhaust port (not shown). Thereby, the dust sucked into the tank 2 together with the outside air is first captured by the filter portion 21 of the prefilter 19, and the fine dust that has passed through the prefilter 19 is captured by the filter portion 14 of the main filter 12.

この運転中に粉塵がプレフィルタ１９のフィルタ部２１に付着して目詰まりすると、フィルタ部２１の通気性が低下して下流側が負圧となるため、フィルタ部２１は、図４に示すように、側面が網体１５と支持枠１６との隙間に嵌り込むと共に、錘２２を有する底面が支持枠１６の内部に下方から嵌り込んで、網体１５及び支持枠１６に張り付く格好で収縮変形する。
但し、メインフィルタ１２側では、プレフィルタ１９が変形しても網体１５の表面に張り付くにとどまり、フィルタ部１４には直接張り付かない上、支持枠１６と併せてそれ以上の変形が防止されるため、集塵に必要な有効表面積は維持できる。 If dust adheres to the filter part 21 of the pre-filter 19 and becomes clogged during this operation, the air permeability of the filter part 21 is reduced and the downstream side becomes negative pressure. The side surface fits into the gap between the mesh body 15 and the support frame 16, and the bottom surface having the weight 22 fits into the support frame 16 from below and shrinks and deforms in a fashion that sticks to the mesh body 15 and the support frame 16. .
However, on the main filter 12 side, even if the pre-filter 19 is deformed, it stays stuck to the surface of the mesh body 15 and does not stick directly to the filter portion 14, and further deformation together with the support frame 16 is prevented. Therefore, the effective surface area required for dust collection can be maintained.

そして、運転スイッチ７をＯＦＦ操作すると、モータが停止して外気の吸引が停止するため、下流側の負圧が解消したプレフィルタ１９は、再びタンク２内への膨出状態に復帰する。このとき、錘２２によってフィルタ部２１の底面が支持枠１６の下方へ勢いよく復帰すると共に、その復帰と共にフィルタ部２１の側面も網体１５と支持枠１６との間から外側へ勢いよく復帰する。よって、フィルタ部２１に付着していた粉塵はフィルタ部２１から払い落とされてタンク２内に落下する。   When the operation switch 7 is turned OFF, the motor is stopped and the suction of outside air is stopped. Therefore, the prefilter 19 from which the negative pressure on the downstream side has been released returns to the state in which the prefilter 19 is expanded into the tank 2 again. At this time, the weight 22 vigorously returns the bottom surface of the filter portion 21 to the lower side of the support frame 16, and at the same time, the side surface of the filter portion 21 also vigorously returns from between the mesh body 15 and the support frame 16 to the outside. . Therefore, the dust adhering to the filter unit 21 is removed from the filter unit 21 and falls into the tank 2.

このように、上記形態の集塵機１によれば、吸気ユニット４の下方でプレフィルタ１９の内側に、下端が開口する下向きカップ状の支持枠１６を設けて、吸気ユニット４の運転中にプレフィルタ１９の下流側で生じる負圧に伴い、プレフィルタ１９が支持枠１６の形状に合わせて変形可能としたことで、運転から運転停止に伴うプレフィルタ１９の収縮から膨出への変形量を大きくしてプレフィルタ１９の好適な塵落とし効果が得られる。またここでは、支持枠１６を弾性変形させることなく自動塵落としが可能となるため、支持枠１６を低コストで簡単に製造可能となる。
因みに、上記集塵機１において、集塵量を０ｇから１００ｇずつ１５００ｇまで増加して各集塵量での流速を測定する試験を、５００ｇごとに運転停止してプレフィルタ１９による自動塵落としを行わせて実施した結果、集塵量０ｇでの流速を１００として集塵量の増加に従って４０程度まで低下したものが、５００ｇごとの運転停止の際には何れも７０以上まで回復することが確認できた。 Thus, according to the dust collector 1 of the said form, the downward cup-shaped support frame 16 which a lower end opens is provided in the inside of the pre-filter 19 under the intake unit 4, and a pre-filter during operation of the intake unit 4 is provided. Since the prefilter 19 can be deformed in accordance with the shape of the support frame 16 along with the negative pressure generated on the downstream side of the 19, the amount of deformation from contraction to bulging of the prefilter 19 due to operation stoppage is increased. Thus, a suitable dust removing effect of the pre-filter 19 is obtained. Further, here, automatic dust removal can be performed without elastically deforming the support frame 16, so that the support frame 16 can be easily manufactured at low cost.
Incidentally, in the dust collector 1, the test for increasing the dust collection amount from 0 g to 1500 g in increments of 100 g and measuring the flow rate at each dust collection amount is stopped every 500 g and the automatic dust removal by the prefilter 19 is performed. As a result, it was confirmed that the flow rate when the dust collection amount was 0 g was set to 100, and the flow rate decreased to about 40 as the dust collection amount increased. .

特にここでは、吸気ユニット４と支持枠１６との間に、支持枠１６の軸線と直交する下面を有する円形筒状の網体１５を設けて、負圧に伴いプレフィルタ１９の側面が網体１５と支持枠１６との隙間に合わせて変形可能としているので、プレフィルタ１９の側面でも大きな変形量が得られ、塵落とし効果の向上が期待できる。
また、プレフィルタ１９をタンク２内への膨出形状に付勢する付勢手段（錘２２）を設けているので、運転停止後のプレフィルタ１９の膨出形状への復帰が確実且つ勢いよくなされ、さらなる塵落とし効果の向上が図られる。
さらに、付勢手段を、プレフィルタ１９の底部に設けられる錘２２としたことで、プレフィルタ１９の形状復帰を簡単な構成で確実に行わせることができる。 In particular, here, a circular cylindrical mesh body 15 having a lower surface orthogonal to the axis of the support frame 16 is provided between the intake unit 4 and the support frame 16, and the side surface of the prefilter 19 is meshed with the negative pressure. Since it can be deformed in accordance with the gap between the support frame 16 and the support frame 16, a large amount of deformation can be obtained even on the side surface of the prefilter 19, and an improvement in dust removal effect can be expected.
Further, since the urging means (weight 22) for urging the prefilter 19 into the bulging shape into the tank 2 is provided, the prefilter 19 can be reliably and vigorously returned to the bulging shape after the operation is stopped. As a result, the dust removal effect is further improved.
Furthermore, the urging means is the weight 22 provided at the bottom of the prefilter 19, so that the shape of the prefilter 19 can be reliably restored with a simple configuration.

なお、支持枠の形態は、カップ状であれば深さや大きさは適宜変更可能で、線材でなく網体や透孔を備えた板体等で形成したりしてもよい。これは上支持枠も同様で、深さや大きさはメインフィルタに合わせて適宜変更可能で、網体でなく線材で形成したりしてもよい。
また、錘も上記形態に限らず、数や形状は変更して差し支えないし、内面でなく外面に取り付けてもよい。勿論付勢手段としては錘に限らず、例えば支持枠の内面との間や上支持枠と支持枠との隙間にスポンジやバネ等の弾性材を介在させたりすることで形成してもよい。但し、これらの上支持枠や付勢手段は省略してもよい。
そして、集塵機自体の構造も、上記形態ではプレフィルタに対して本発明を適用しているが、例えばメインフィルタがなく、タンク内に膨出する単一のフィルタのみで塵埃の捕捉を図る集塵機であっても、本発明は適用可能である。 In addition, if the form of the support frame is cup-shaped, the depth and size can be changed as appropriate, and the support frame may be formed by a plate or the like provided with a net or a through hole instead of a wire. This is the same for the upper support frame, and the depth and size can be appropriately changed in accordance with the main filter, and may be formed of a wire instead of a net.
Further, the weight is not limited to the above form, and the number and shape may be changed, and may be attached to the outer surface instead of the inner surface. Of course, the urging means is not limited to the weight, and may be formed by interposing an elastic material such as a sponge or a spring between the inner surface of the support frame or between the upper support frame and the support frame. However, these upper support frames and biasing means may be omitted.
The structure of the dust collector itself also applies the present invention to the pre-filter in the above form. For example, there is no main filter, and a dust collector that captures dust with only a single filter that swells in the tank. Even if it exists, this invention is applicable.

１・・集塵機、２・・タンク、３・・本体、４・・吸気ユニット、６・・吸気口、１０・・吸込口、１２・・メインフィルタ、１４・・フィルタ部、１５・・網体、１６・・支持枠、１９・・プレフィルタ、２１・・フィルタ部、２２・・錘。   1 .... Dust collector, 2 .... Tank, 3 .... Main body, 4 .... Air intake unit, 6 .... Air intake, 10 .... Suction port, 12 .... Main filter, 14 .... Filter part, 15..Net body , 16 ... Support frame, 19 ... Pre-filter, 21 ... Filter part, 22 ... Weight.

Claims (2)

吸込口を有するタンクの上方に、モータ及び吸込ファンを備えた吸気ユニットを有する本体を載置して、前記タンク内で前記吸込口と吸気ユニットとの間に、前記タンク内へ膨出する可撓性で有底筒のフィルタを介在させた集塵機であって、
前記フィルタ内に、前記モータが駆動して前記吸込ファンが回転すると前記フィルタの収縮変形と共に上方に移動し、前記モータが停止すると自重により下方に移動して前記フィルタを前記タンク内への膨出形状に付勢する付勢手段を設けたことを特徴とする集塵機。 A main body having an intake unit having a motor and an intake fan is placed above a tank having an intake port, and can swell into the tank between the intake port and the intake unit in the tank. A dust collector with a flexible , bottomed tube filter,
When the motor is driven and the suction fan rotates in the filter, the filter moves upward along with the contraction and deformation of the filter. When the motor stops, the filter moves downward due to its own weight and bulges the filter into the tank. A dust collector comprising an urging means for urging the shape. 前記付勢手段は、前記フィルタ内の底部に設けられる錘であることを特徴とする請求項１に記載の集塵機。 The dust collector according to claim 1, wherein the biasing means is a weight provided at a bottom portion in the filter .
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