JP3780454B2 - Breathing protection with electric fan - Google Patents

Breathing protection with electric fan Download PDF

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Publication number
JP3780454B2
JP3780454B2 JP2002175440A JP2002175440A JP3780454B2 JP 3780454 B2 JP3780454 B2 JP 3780454B2 JP 2002175440 A JP2002175440 A JP 2002175440A JP 2002175440 A JP2002175440 A JP 2002175440A JP 3780454 B2 JP3780454 B2 JP 3780454B2
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JP
Japan
Prior art keywords
duct
fan unit
fan
main body
body casing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002175440A
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Japanese (ja)
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JP2004016466A (en
Inventor
展也 堀口
真樹 篠宮
明 竹下
真 真道
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koken Co Ltd
Original Assignee
Koken Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Priority to JP2002175440A priority Critical patent/JP3780454B2/en
Publication of JP2004016466A publication Critical patent/JP2004016466A/en
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Publication of JP3780454B2 publication Critical patent/JP3780454B2/en
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  • Respiratory Apparatuses And Protective Means (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、防塵・防毒マスク等へ装着するのに好適な電動ファン付き呼吸用保護具に関する。
【0002】
【従来の技術】
一般的な電動ファン付き呼吸用保護具は、図9及び図10に示すように、電動ファンを内蔵したファンユニット1の吸込口2より上流側にフィルタ、吸収缶等の濾過材3が配置され、この濾過材3で濾過した空気を、電動ファンの回転により吸い込み、同様に電動ファンの回転により、濾過された空気をファンユニット1の吐出口から連結管を通してマスク内へ供給するようになっている。
そして、裏面側ケース4と表面側ケース5とに分割された本体ケーシング6内において、裏面側ケース4内へファンユニットを収納し、表面側ケース5へ濾過材3を取り付けてある。
【0003】
従来、濾過材3からファンユニット1の吸込口2に至る空気流路の密封性は、ファンユニット1の吸込口2側と本体ケーシング6とをシリコーン系の接着剤a等で接着し、濾過材3と本体ケーシング6との接合部にゴムパッキングb等を挟み込むことにより確保していた。
しかし、気密性保持のために接着剤aを用いると、塗布後、乾燥するまでに約1日程度の時間を要するため、組立時間の短縮が困難であった。
また、無理に接着剤aを剥がさない限り、ファンユニット1と本体ケーシング6とを分離できないので、電動ファンやこれを駆動するモータ8に不具合が生じた時、部品交換や修理を行うのが困難であった。
【0004】
【発明が解決しようとする課題】
この発明は、短時間で簡単に組み立てられて高度な気密性が得られ、メインテナンスが容易な電動ファン付き呼吸用保護具を提供することを課題とする。
【0005】
【課題を解決するための手段】
本発明の電動ファン付き呼吸用保護具は、本体ケーシング内へ、電動ファンを内蔵したファンユニットを収納し、ファンユニットの吸込口より上流側において、前記本体ケーシングに形成した透孔へ濾過材を挿入し前記本体ケーシング内部の、前記ファンユニットの吸込口と前記濾過材との間に、弾力性材料より成る筒状のダクトを介在し、ダクトの一端外周にフィンを張り出すと共に、前記ファンユニットの吸込口の周囲に装着した押圧リングで前記フィンを前記ファンユニットへ押圧して、前記ダクトの一端と前記ファンユニットの吸込口とを圧着し、前記ダクトの他端寄りの外周に嵌合溝を形成すると共に、前記本体ケーシングの透孔の奥端内周にダクト係止鍔を形成し、該ダクト係止鍔を前記嵌合溝へ係止することにより、前記ダクト係止鍔と前記濾過材とにより前記ダクトの他端を挟み付けて、前記ダクトの他端と前記濾過材とを圧着する
【0006】
本体ケーシング内へファンユニットを収納し、ダクトを設置してその一端をファンユニットに圧着し、さらに、本体ケーシングに濾過材を取り付けると共に、濾過材とダクトの他端とを圧着するだけで、本体ケーシング、ファンユニット、濾過材及びダクトが組立てられる。
また、部材どうしの接合に接着剤を用いないので、接着剤を乾燥する時間が不要であり、分解も簡単なため、容易に部品交換や修理を行える。
体ケーシングに複数の濾過材を取り付け、ダクトに濾過材へ至る複数の分岐部を形成することもある。
【0007】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて詳細に説明する。なお、本発明の構成部材の内、図9及び図10に示す従来のものと共通する部材については、共通の符号を付す。
図1及び図2に示すように、本発明の電動ファン付き呼吸用保護具は、本体ケーシング6内へ、電動ファンを内蔵したファンユニット1を収納し、ファンユニット1の吸込口2より上流側において、本体ケーシング6に複数(図に示す例では2個)の濾過材3を取り付け、本体ケーシング6の内部の、ファンユニット1の吸込口2と濾過材3との間に、筒状のダクト7を設置して構成される。
【0008】
図5及び図6に示すように、ファンユニット1の表面側中央には、吸込口2となる隙間をあけてモータ8が設置され、モータ8の出力軸には図示しない電動ファンが接続されている。
また、ファンユニット1の表面には、吸込口2を囲むように円形のダクト係止溝9が形成され、ダクト係止溝9の底面には、先細状の突条20が周方向に沿って形成されている(図3)。
【0009】
さらに、ダクト係止溝9の外方には複数のネジ筒10が周方向に適宜間隔をおいて起立され、各ネジ筒10には、ダクト7の一端を押さえる押圧リング11がネジ12で取り付けられるようになっている(図1)。
押圧リング11は、硬質プラスチック等より成り、ダクト7の一端部の外径より僅かに大きい内径を有し、その外周には、ネジ12を挿通するための複数の取付片23が、ネジ筒10と対応する間隔で形成される。
また、ファンユニット1の吐出口13には、マスク内部とを連結する連結管を装着するための接続筒14が設けられる。
【0010】
濾過材3は、本実施形態ではアルファリングフィルタを用いてあるが、その他のフィルタ或いは吸収缶を使用することもできる。
また、濾過材3の基端面には、先細状の押圧突条21が周方向に沿って形成されている(図4)。
図1及び図2に示すように、本体ケーシング6は、裏面側ケース4と表面側ケース5とから成り、裏面側ケース4内へファンユニット1を、モータ8及び吸込口2を表面に向けて収納するようになっている。
また、表面側ケース5の両側に濾過材3を取り付けるための透孔15が穿設され、透孔15の奥端には、内方へ張り出すダクト係止鍔16が周方向に沿って形成されている。
【0011】
ダクト7は、硬度50°のシリコーンゴムより成る弾力性材料を素材とし、図7及び図8に示すように、その一端外周にはフィン17が張り出される。
そして、このフィン17をファンユニット1のダクト係止溝9に嵌め込んで、ネジ筒10に取り付けた押圧リング11でフィン17を押さえつけることにより、ダクト7の一端がファンユニット1の吸込口2に密封状態で接続されるようになっている(図1)。
【0012】
ダクト7の他端部には、それぞれ濾過材3に至る2本の分岐部18が、左右両側に延びるよう形成される。分岐部18の先端部分は肉厚に形成され、その外面には、表面側ケース5のダクト係止鍔16が嵌合される係合溝19が周方向に沿って形成される。
また、左右の分岐部18の間には、ファンユニット1のモータ8と干渉し合わないように、表面側に突出する***部22が形成されている。
【0013】
この電動ファン付き呼吸用保護具は、次のように組み立てられる。
本体ケーシング6の裏面側ケース4内にファンユニット1を、そのモータ8を表面側に向けて設置する。
次いで、ファンユニット1の表面にダクト7を被せ、ダクト7の一端に形成されたフィン17をファンユニット1のダクト係止溝9へ係合する。ダクト7の一端部外周には予め押圧リング11を嵌合し、押圧リング11の取付片23にネジ12を挿通してある。
さらに、ネジ12をファンユニット1のネジ筒10にねじ込んで、押圧リング11でフィン17を押さえると、ダクト係止溝9の底面に形成された突条20がフィン17の端面にくい込んで、ダクト7の一端とファンユニット1の吸込口2とが密封状態で圧着される。
【0014】
次に、裏面側ケース4及びダクト7の表面に表面側ケース5を被せ、表面側ケース5の透孔15の奥端部に形成されたダクト係止鍔16と、ダクト7の分岐部18の先端に形成された係合溝19とをそれぞれ係合する。
その後、表面側ケース5の透孔15にそれぞれ濾過材3の基部を挿入すると、ダクト7の分岐部18の先端(係合溝19より先の部分)が濾過材3の端面と表面側ケース5のダクト係止鍔16とで挟み付けられて、濾過材3と本体ケーシング6との接合部におけるパッキングとなり、また、濾過材3の押圧突条21がダクト7の分岐部18の先端面にくい込んで、濾過材3と本体ケーシング6とが密封状態で圧着され、濾過材3とファンユニット1の吸込口2が筒状のダクト7で連結される。
【0015】
なお、ダクト7の他端部に3本以上の分岐部18を形成して、分岐部18に接続される濾過材3の数を増加することも可能である。
また、ダクト7の素材としては、硬度30°〜70°程度の弾力を有するものであれば、アクリルゴム、ニトリルゴム等のシリコーンゴム以外のものを用いることもできる。
【0016】
【発明の効果】
請求項1に係る発明によれば、本体ケーシング内へファンユニットを収納し、ダクトを設置してその一端をファンユニットに圧着し、さらに、本体ケーシングに濾過材を取り付けると共に、濾過材とダクトの分岐部先端とを圧着するだけで、簡単に組立ることができ、濾過材とダクト及びファンユニットとダクトとの、高度な機密性が確保される。
また、ダクトとファンユニットとの接合、ダクトと濾過材との接合、これら構成部材と本体ケーシングとの接合に接着剤を用いないので、接着剤を乾燥させる時間が不要で、組立に要する時間が短縮され、分解も簡単なため、電動ファンやモータが故障したときに容易に修理や部品交換を行うことができる。
【図面の簡単な説明】
【図1】本発明の実施形態を示す電動ファン付き呼吸用保護具の断面図
【図2】同上の分解断面図
【図3】図1のA部拡大図
【図4】図1のB部拡大図
【図5】ファンユニットの表面図
【図6】ファンユニットの断面図
【図7】ダクトの表面図
【図8】ダクトの断面図
【図9】従来の電動ファン付き呼吸用保護具の断面図
【図10】従来の電動ファン付き呼吸用保護具の分解断面図
【符号の説明】
1 ファンユニット
2 吸込口
3 濾過材
4 裏面側ケース
5 表面側ケース
6 本体ケーシング
7 ダクト
8 モータ
9 ダクト係止溝
10 ネジ筒
11 押圧リング
12 ネジ
13 吐出口
14 接続筒
15 透孔
16 ダクト係止鍔
17 フィン
18 分岐部
19 係合溝
20 突条
21 押圧突条
22 ***部
23 取付片
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a respirator with an electric fan suitable for mounting on a dust / gas mask.
[0002]
[Prior art]
As shown in FIGS. 9 and 10, in a general respiratory protective device with an electric fan, a filter medium 3 such as a filter or an absorption can is disposed upstream of the suction port 2 of the fan unit 1 incorporating the electric fan. The air filtered by the filter medium 3 is sucked by the rotation of the electric fan, and similarly, the filtered air is supplied from the discharge port of the fan unit 1 into the mask through the connecting pipe by the rotation of the electric fan. Yes.
In the main body casing 6 divided into the back side case 4 and the front side case 5, the fan unit is housed in the back side case 4 and the filter medium 3 is attached to the front side case 5.
[0003]
Conventionally, the sealing property of the air flow path from the filter medium 3 to the suction port 2 of the fan unit 1 is obtained by bonding the suction port 2 side of the fan unit 1 and the main body casing 6 with a silicone-based adhesive a or the like. The rubber packing b or the like is sandwiched between the joint portion 3 and the main body casing 6 to secure the same.
However, when the adhesive a is used to maintain airtightness, it takes about 1 day to dry after application, so it is difficult to shorten the assembly time.
In addition, since the fan unit 1 and the main body casing 6 cannot be separated unless the adhesive a is forcibly removed, it is difficult to replace or repair parts when a failure occurs in the electric fan or the motor 8 that drives the fan. Met.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a respirator with an electric fan that can be easily assembled in a short time to obtain a high level of airtightness and is easy to maintain.
[0005]
[Means for Solving the Problems]
Electric fan with respirator of the present invention, to the main body casing, a fan unit with a built-in electric fan housed in the upstream side of the inlet of the fan unit, the filtering material into the through hole formed in the main body casing insert the inside the main body casing, between the inlet and the filtration material of the fan unit, interposed the tubular duct made of resilient material, the protruding fins at one end periphery of the duct, The fin is pressed against the fan unit by a pressure ring attached around the suction port of the fan unit, and one end of the duct and the suction port of the fan unit are pressure-bonded to the outer periphery near the other end of the duct. By forming a fitting groove and forming a duct locking rod on the inner periphery of the inner end of the through hole of the main body casing, and locking the duct locking rod to the fitting groove, And clamped to the other end of the duct and the duct locking collar by said filtering material to bond the said filtering material and the other end of the duct.
[0006]
The fan unit is housed in the main casing, the duct is installed, one end of the duct is crimped to the fan unit, the filter medium is attached to the main casing, and the filter medium is simply crimped to the other end of the duct. The casing, fan unit, filter medium and duct are assembled.
Moreover, because an adhesive agent is not used for the bonding of members to each other, it is unnecessary time to dry the adhesive, since decomposition simplest, Ru can easily parts replacement or repair.
Attaching a plurality of filtration media to the body casing, sometimes forming a plurality of branch portions extending in the duct to the filtration material.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Of the constituent members of the present invention, members common to those shown in FIGS. 9 and 10 are denoted by common reference numerals.
As shown in FIGS. 1 and 2, the respirator with an electric fan of the present invention houses a fan unit 1 incorporating an electric fan in a main body casing 6, and is upstream from the suction port 2 of the fan unit 1. 2, a plurality of (two in the illustrated example) filter media 3 are attached to the main body casing 6, and a cylindrical duct is disposed between the suction port 2 of the fan unit 1 and the filter media 3 inside the main body casing 6. 7 is configured.
[0008]
As shown in FIGS. 5 and 6, a motor 8 is installed in the center of the front side of the fan unit 1 with a gap serving as a suction port 2, and an electric fan (not shown) is connected to the output shaft of the motor 8. Yes.
Further, a circular duct locking groove 9 is formed on the surface of the fan unit 1 so as to surround the suction port 2, and a tapered ridge 20 is formed along the circumferential direction on the bottom surface of the duct locking groove 9. It is formed (FIG. 3).
[0009]
Further, a plurality of screw cylinders 10 are erected at appropriate intervals in the circumferential direction outside the duct locking groove 9, and a pressing ring 11 that holds one end of the duct 7 is attached to each screw cylinder 10 with screws 12. (Fig. 1).
The pressing ring 11 is made of hard plastic or the like, has an inner diameter slightly larger than the outer diameter of one end of the duct 7, and a plurality of mounting pieces 23 for inserting the screws 12 are provided on the outer periphery thereof. And corresponding intervals.
The discharge port 13 of the fan unit 1 is provided with a connection cylinder 14 for mounting a connecting pipe that connects the inside of the mask.
[0010]
The filter medium 3 uses an alpha ring filter in the present embodiment, but other filters or absorption cans can also be used.
Moreover, the taper-shaped press protrusion 21 is formed in the base end surface of the filter medium 3 along the circumferential direction (FIG. 4).
As shown in FIG. 1 and FIG. 2, the main body casing 6 is composed of a back side case 4 and a front side case 5, with the fan unit 1 into the back side case 4 and the motor 8 and the suction port 2 facing the front side. It comes to store.
Further, through holes 15 for attaching the filter medium 3 are formed on both sides of the surface side case 5, and duct locking rods 16 projecting inward are formed along the circumferential direction at the back end of the through holes 15. Has been.
[0011]
The duct 7 is made of an elastic material made of silicone rubber having a hardness of 50 °, and as shown in FIGS. 7 and 8, fins 17 are projected on the outer periphery of one end thereof.
Then, the fin 17 is fitted into the duct locking groove 9 of the fan unit 1, and the fin 17 is pressed by the pressing ring 11 attached to the screw cylinder 10, so that one end of the duct 7 is connected to the suction port 2 of the fan unit 1. They are connected in a sealed state (FIG. 1).
[0012]
At the other end portion of the duct 7, two branch portions 18 that respectively reach the filter medium 3 are formed so as to extend to the left and right sides. The front end portion of the branching portion 18 is formed thick, and an engaging groove 19 into which the duct locking rod 16 of the surface side case 5 is fitted is formed on the outer surface along the circumferential direction.
Further, between the left and right branch portions 18, a raised portion 22 that protrudes to the surface side is formed so as not to interfere with the motor 8 of the fan unit 1.
[0013]
This respirator with an electric fan is assembled as follows.
The fan unit 1 is installed in the back side case 4 of the main casing 6 with the motor 8 facing the front side.
Next, the surface of the fan unit 1 is covered with the duct 7, and the fin 17 formed at one end of the duct 7 is engaged with the duct locking groove 9 of the fan unit 1. A press ring 11 is fitted in advance on the outer periphery of one end of the duct 7, and a screw 12 is inserted through an attachment piece 23 of the press ring 11.
Further, when the screw 12 is screwed into the screw cylinder 10 of the fan unit 1 and the fin 17 is pressed by the pressing ring 11, the protrusion 20 formed on the bottom surface of the duct locking groove 9 is not easily inserted into the end surface of the fin 17, 7 and the suction port 2 of the fan unit 1 are pressure-bonded in a sealed state.
[0014]
Next, the surface side case 5 is put on the surfaces of the back side case 4 and the duct 7, and the duct locking rod 16 formed at the back end portion of the through hole 15 of the surface side case 5 and the branching portion 18 of the duct 7. The engaging groove 19 formed at the tip is engaged with each other.
Thereafter, when the base portions of the filter medium 3 are respectively inserted into the through holes 15 of the surface side case 5, the ends of the branch portions 18 of the duct 7 (portions ahead of the engagement grooves 19) are connected to the end surface of the filter medium 3 and the surface side case 5. Are sandwiched by the duct locking rod 16 to form a packing at the joint between the filter medium 3 and the main body casing 6, and the pressing protrusion 21 of the filter medium 3 is not easily inserted into the front end surface of the branch portion 18 of the duct 7. Thus, the filter medium 3 and the main casing 6 are pressure-bonded in a sealed state, and the filter medium 3 and the suction port 2 of the fan unit 1 are connected by a cylindrical duct 7.
[0015]
It is also possible to increase the number of filter media 3 connected to the branch portion 18 by forming three or more branch portions 18 at the other end of the duct 7.
As the material of the duct 7, materials other than silicone rubber such as acrylic rubber and nitrile rubber can be used as long as they have elasticity of hardness of about 30 ° to 70 °.
[0016]
【The invention's effect】
According to the first aspect of the present invention, the fan unit is housed in the main body casing, the duct is installed and one end thereof is crimped to the fan unit, and the filter medium is attached to the main body casing. simply crimping the branch tip, it can easily assembled, the filtering material and the duct and the fan unit and the duct, is Ru is ensured high confidentiality.
Also, since no adhesive is used to join the duct and fan unit, duct and filter medium, and these components and the main casing, there is no need to dry the adhesive and the time required for assembly. Since it is shortened and is easily disassembled, it can be easily repaired and replaced when an electric fan or motor fails.
[Brief description of the drawings]
1 is a cross-sectional view of a respirator with an electric fan showing an embodiment of the present invention. FIG. 2 is an exploded cross-sectional view of the same. FIG. 3 is an enlarged view of a portion A in FIG. Enlarged view [Figure 5] Surface view of the fan unit [Figure 6] Cross section of the fan unit [Figure 7] Surface view of the duct [Figure 8] Sectional view of the duct [Figure 9] Conventional respiratory protection device with electric fan Sectional view [Figure 10] Exploded sectional view of a conventional respiratory protective device with an electric fan [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fan unit 2 Suction port 3 Filter material 4 Back surface case 5 Front surface case 6 Main body casing 7 Duct 8 Motor 9 Duct latching groove 10 Screw cylinder 11 Press ring 12 Screw 13 Discharge port 14 Connection cylinder 15 Through-hole 16 Duct latch鍔 17 Fin 18 Branching portion 19 Engaging groove 20 Projection 21 Pressing projection 22 Raising portion 23 Mounting piece

Claims (2)

本体ケーシング内へ、電動ファンを内蔵したファンユニットを収納し、該ファンユニットの吸込口より上流側において、前記本体ケーシングに形成した透孔へ濾過材を挿入し、前記本体ケーシング内部の、前記ファンユニットの吸込口と前記濾過材との間に、弾力性材料より成る筒状のダクトを介在し、該ダクトの一端外周にフィンを張り出すと共に、前記ファンユニットの吸込口の周囲に装着した押圧リングで前記フィンを前記ファンユニットへ押圧して、前記ダクトの一端と前記ファンユニットの吸込口とを圧着し、前記ダクトの他端寄りの外周に嵌合溝を形成すると共に、前記本体ケーシングの透孔の奥端内周にダクト係止鍔を形成し、該ダクト係止鍔を前記嵌合溝へ係止することにより、前記ダクト係止鍔と前記濾過材とにより前記ダクトの他端を挟み付けて、前記ダクトの他端と前記濾過材とを圧着したことを特徴とする電動ファン付き呼吸用保護具。A fan unit incorporating an electric fan is housed in the main body casing, and a filter medium is inserted into a through hole formed in the main body casing on the upstream side of the suction port of the fan unit, and the fan inside the main body casing is disposed. A cylindrical duct made of an elastic material is interposed between the suction port of the unit and the filter medium, and a fin is extended to the outer periphery of one end of the duct, and a pressure attached around the suction port of the fan unit The fin is pressed against the fan unit by a ring to crimp one end of the duct and the suction port of the fan unit, and form a fitting groove on the outer periphery near the other end of the duct. By forming a duct locking rod on the inner periphery of the inner end of the through hole, and locking the duct locking rod to the fitting groove, the duct locking rod and the filter medium allow the And clamped to the other end of the extract, electric fan with respirator being characterized in that crimp the said filtering material and the other end of the duct. 前記本体ケーシングに複数の濾過材が取り付けられ、前記ダクトに前記濾過材へ至る複数の分岐部が形成された請求項1に記載の電動ファン付き呼吸用保護具。  The respiratory protector with an electric fan according to claim 1, wherein a plurality of filtering media are attached to the main body casing, and a plurality of branch portions reaching the filtering media are formed in the duct.
JP2002175440A 2002-06-17 2002-06-17 Breathing protection with electric fan Expired - Fee Related JP3780454B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002175440A JP3780454B2 (en) 2002-06-17 2002-06-17 Breathing protection with electric fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002175440A JP3780454B2 (en) 2002-06-17 2002-06-17 Breathing protection with electric fan

Publications (2)

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JP2004016466A JP2004016466A (en) 2004-01-22
JP3780454B2 true JP3780454B2 (en) 2006-05-31

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006102324A (en) 2004-10-07 2006-04-20 Shigematsu Works Co Ltd Protective tool for breathing with electric fan
GB2464736A (en) 2008-10-25 2010-04-28 Dyson Technology Ltd Fan with a filter
GB2478926B (en) * 2010-03-23 2016-09-28 Dyson Technology Ltd Portable Fan Assembly with Detachable Filter Unit
GB2478927B (en) 2010-03-23 2016-09-14 Dyson Technology Ltd Portable fan with filter unit
JP6894627B2 (en) * 2017-08-31 2021-06-30 山本光学株式会社 Fan unit and respiratory protective equipment with this fan unit
CN111298314A (en) * 2020-03-20 2020-06-19 中山市赛恩电器科技有限公司 Respiratory protection device and protection wearing system

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