JP4649723B2 - Blower and cooling device equipped with a blower - Google Patents

Blower and cooling device equipped with a blower Download PDF

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Publication number
JP4649723B2
JP4649723B2 JP2000330252A JP2000330252A JP4649723B2 JP 4649723 B2 JP4649723 B2 JP 4649723B2 JP 2000330252 A JP2000330252 A JP 2000330252A JP 2000330252 A JP2000330252 A JP 2000330252A JP 4649723 B2 JP4649723 B2 JP 4649723B2
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Japan
Prior art keywords
blower
case
refrigerator
axial fan
drain hole
Prior art date
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JP2000330252A
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Japanese (ja)
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JP2002130188A (en
Inventor
幸子 金原
正治 朝田
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2000330252A priority Critical patent/JP4649723B2/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
    • F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
    • F25D2317/0681—Details thereof

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  • Control Of Positive-Displacement Air Blowers (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は冷却雰囲気中で使用する送風機及びこの送風機を備えた冷蔵庫などの冷却機器に関するものである。
【０００２】
【従来の技術】
従来から、小型、省電力化を目的とした軸流型の送風機が知られており、このような送風機を、冷蔵庫をはじめとし、ショーケース，製氷機，自動販売機，各種空調機器のような冷却機器に適用することは容易に考えられる。
【０００３】
従来の送風機としては特開平６−１０８９２号公報に示されているものがある。以下図面を参照しながら上記従来の送風機を説明する。
【０００４】
図７は従来の送風機の断面図である。図７において、１は軸流ファンであり、ケース２に取付けられている。ケース２は軸流ファン１に対して吸込側と吐出側を区画し、吸込側から吐出側への空気の流通を円滑にする為に、軸流ファン１を所定の間隔をおいて囲むように形成されたマウスリング３を備えている。
【０００５】
また、ケース２の軸流ファン１を取付ける部分についての明確な記載はないが、ケース２に軸流ファン１を取付ける支持部があるのは当然のことであり、ケース２の中央部に軸流ファン１のボス径とほぼ同一径のモータ支持部４を設けるのが一般的である。
【０００６】
また、図８は低騒音化と高風圧化を図った送風機の断面図である。図８においてケース５は軸流ファン１の周囲を所定の間隔をおいてマウスリング６で囲み、軸流ファン１に対向した開口部７を有し、袋状空間部８を形成している。
【０００７】
【発明が解決しようとする課題】
しかしながら、従来の図７のような送風機を冷蔵庫などの冷却機器へ適用して、冷却器に近接して配置する場合、庫外からの湿気による結露や除霜で溶けた水が軸流ファン１やマウスリング３に付着したままで氷結が進行し、氷結による接触音を発生して冷却機器全体の騒音が大きくなったり、拘束状態に至って貯蔵室を所定の温度に安定して保つことができなくなってしまうという問題点を生じる。
【０００８】
また、従来の図８のような送風機を冷却器に近接して配置する場合には、マウスリング６の開口部７から結露や除霜で溶けた水が入り、ケース５の袋状空間部８に溜まって氷結を進行させるという、上述と同様の問題点を生じる。
【０００９】
本発明は、従来の課題を解決するもので、氷結の進行による送風機の騒音の増加や拘束状態の発生を防止するとともに、送風機を正常に動作させることで、低騒音でかつ貯蔵室を所定の温度に安定して保つことが出来る冷却機器を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明の請求項１に記載の発明は、軸流ファンと、前記軸流ファンの周囲を所定の間隔をおいて袋状空間部を形成するマウスリングを備えたケースとで構成され、前記ケースの袋状空間部には水抜穴が設けられた送風機であって、前記ケースを方形とし、前記水抜穴は少なくとも対角線上に複数個設けられたことを特徴とする送風機であり、水がマウスリングの開口部から入ってケースに溜まっても、水抜穴から水を排出する作用があり、また送風機の取付ける向きを限定しなくても、水抜穴の位置を設定される作用がある。
【００１８】
請求項２に記載の発明は、請求項１に記載の送風機を水抜穴が、ケースを取付け位置に取付けた時に前記ケースの最下部になるよう冷却器の冷却雰囲気中に取り付けたことを特徴とする送風機を備えた冷却機器であり、送風機の取付ける向きを限定しなくても、水抜穴の位置が最低部に設定される作用がある。
【００２１】
【発明の実施の形態】
以下、本発明による送風機及び送風機を備えた冷却機器の実施の形態について、図面を参照しながら説明する。
【００２２】
（実施の形態１）
図１は本発明の実施の形態１による送風機を備えた冷却機器である冷蔵庫の要部断面図である。図２は同実施の形態の冷蔵庫に用いる送風機の正面図である。図３は同実施の形態の冷蔵庫に用いる送風機の断面図である。
【００２３】
図１において、９は冷却機器の一例としての冷蔵庫本体、１０は冷蔵庫本体９に設けられた冷蔵室であり、冷蔵室１０の背面側には冷却器１１が配置され、冷却器１１を覆う様に、冷気が循環する為の風路を形成する庫内背面ダクト１２が取付けられており、庫内背面ダクト１２には送風機１３が取付けられている。
【００２４】
図２、図３において、送風機１３は軸流ファン１４と、ケース１５から構成され、軸流ファン１４はケース１５の中央部に位置するモータ支持部１６に取付けられている。ケース１５は、軸流ファン１４に対して吸込側と吐出側を区画し、吸込側から吐出側への空気の流通を円滑にする為に、軸流ファン１４を所定の間隔をおいて囲むように形成されたマウスリング１７を備えており、モータ支持部１６の外周部には軸流ファン１４のボス径より大きいフランジ形状となる水切部１８が設けられている。
【００２５】
以上の様に構成された冷蔵庫について、以下その動作を説明する。
【００２６】
送風機１３は冷却器１１に近接して配置される為、冷却器１１で生じた冷気により零度以下に冷やされ、庫外からの湿気によって結露したり、除霜して溶けた水が付着する。このとき、ケース１５のモータ支持部１６に付着した水は、フランジ形状の水切部１８に沿って下に落ちる為、軸流ファン１４の内部には回り込まず、水が侵入して氷結することを防止出来る。この為、ファンと氷が接触する接触音の発生や、氷結によるファン拘束で冷却不能に陥ることを防止でき、信頼性の高い強制通風式の冷蔵庫を提供することが出来る。
【００２７】
尚、ケース１５の表面に親水処理を行うことにより、モータ支持部１３やマウスリング１７に付着した水が流れ易くなり、更に水切りを円滑に行うことが可能である。
【００２８】
また、除霜終了直前に送風機１３を回転させると、モータの発熱作用によって送風機１３の周囲温度が上がり、除霜で溶けきれずに送風機１３に付着したままの霜や氷を溶かすことが出来る為、更なる氷結の進行を防止するのに有効である。
【００２９】
（実施の形態２）
図４は本発明の実施の形態２による送風機を備えた冷却機器である冷蔵庫の要部透視正面図、図５は同実施の形態の冷蔵庫に適用する送風機の正面図、図６は同実施の形態の冷蔵庫に適用する送風機の断面図である。
【００３０】
図４において、冷却器１１を覆う様に冷気が循環する為の風路を形成する庫内背面ダクト１２に送風機１９が取付けられている。
【００３１】
図５、図６において、送風機１９は軸流ファン２０と、方形のケース２１から構成され、軸流ファン２０はケース２１の中央部に位置するモータ支持部２２に取付けられている。ケース２１はマウスリング２３を備え、マウスリング２３は、軸流ファン２０に対して吸込側と吐出側を区画し、軸流ファン２０の周囲を所定の間隔をおいて囲んで、低騒音化と高風圧化を図る為に、軸流ファン２０に対向した開口部２４を有して袋状空間部２５を形成している。
【００３２】
また、ケース２１には対角のコーナー部に水抜穴２６が設けられており、水抜穴２６が下側になる様に送風機１９は傾けて庫内背面ダクト１２に取付けられている。更に、送風機１９は水抜穴２６が冷却器１１の方を向く様に庫内背面ダクト１２に傾けて取付けられている。
【００３３】
以上の様に構成された冷蔵庫について、以下その動作を説明する。
【００３４】
送風機１９は冷却器１１に近接して配置される為、冷却器１１で生じた冷気により零度以下に冷やされ、庫外からの湿気により結露したり、除霜して溶けた水がマウスリング２３の開口部２４から入って、ケース２１の袋状空間部２５に溜まる。このとき、送風機１９は水抜穴２６の方に傾いて取付けられている為、方形のケースの上下辺に当る横辺も傾斜し、袋状空間部２５に溜まった水は横辺を伝って水抜穴２６に向かって流れ易くなり、袋状空間部２５に水が溜まったままで氷結が進行する状態を防止することが出来る。
【００３５】
更に、送風機１９は水抜穴２６が冷却器１１の方を向く様に傾けられている為、水が水抜穴２１に流れ易くなるとともに、水抜穴２６から流れ出た水は冷却器１１の下部に設ける図示しない排水穴から外部へ排出することが出来る。
【００３６】
尚、水抜穴２６の位置を基準に送風機１９を取付けるには、同時に送風機の向きを固定することになってしまうが、水抜穴２６は少なくとも対角線上に複数個設けると、送風機の向きに対して取付け上の自由度を与えることが可能となる。
【００３７】
また、本実施の形態ではケース２１を方形のものとしたが、これに限らず例えば円形の形状にすることもでき、この場合は水抜穴２６を最低部にくるよう配置すれば、必然的に水を水抜穴２６に導くことが出来る。
【００３８】
以上の実施の形態においては、冷蔵庫について説明したが、前述のように冷蔵庫（冷凍庫も含む）に限らず、ショーケース，製氷機，自動販売機，各種空調機器など冷却器により冷却機能を発揮する冷却機器であれば同様の構成において同様の効果が得られるものである。
【００３９】
【発明の効果】
以上説明したように、請求項１に記載の発明は、軸流ファンと、前記軸流ファンの周囲を所定の間隔をおいて袋状空間部を形成するマウスリングを備えたケースとで構成され、前記ケースの袋状空間部には水抜穴が設けられた送風機であって、前記ケースを方形とし、前記水抜穴は少なくとも対角線上に複数個設けられたことを特徴とする送風機であり、低温雰囲気に置かれてもケースに水が溜まったままで氷結が進行する状態を防止し、氷結による接触音や拘束状態の発生を未然に防ぐ事が出来、また送風機の使用姿勢に対して自由度を与えることが出来る。
【００４７】
請求項２に記載の発明は、請求項１に記載の送風機を水抜穴が、ケースを取付け位置に取付けた時に前記ケースの最下部になるよう冷却器の冷却雰囲気中に取り付けたことを特徴とする送風機を備えた冷却機器であり、送風機の取付ける向きを限定しなくても、水抜穴の位置が最低部に設定される為、送風機の取付けに対して自由度を与えることが出来る。
【図面の簡単な説明】
【図１】本発明による実施の形態１における冷蔵庫の要部断面図
【図２】同実施の形態における冷蔵庫の送風機の正面図
【図３】同実施の形態における冷蔵庫の送風機の断面図
【図４】本発明による実施の形態２における冷蔵庫の要部透視正面図
【図５】同実施の形態における冷蔵庫の送風機の正面図
【図６】同実施の形態における送風機の断面図
【図７】従来の送風機の断面図
【図８】従来の送風機の断面図
【符号の説明】
９ 冷蔵庫
１１ 冷却器
１３，１９ 送風機
１４，２０ 軸流ファン
１５，２１ ケース
１６，２２ モータ支持部
１７，２３ マウスリング
１８ 水切部
２５ 袋状空間部
２６ 水抜穴[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blower used in a cooling atmosphere and a cooling device such as a refrigerator equipped with the blower.
[0002]
[Prior art]
Conventionally, axial-flow type fans for the purpose of miniaturization and power saving have been known, and such fans are used in refrigerators, showcases, ice makers, vending machines, various air conditioners, etc. It can be easily applied to cooling equipment.
[0003]
A conventional blower is disclosed in JP-A-6-10892. The conventional blower will be described below with reference to the drawings.
[0004]
FIG. 7 is a sectional view of a conventional blower. In FIG. 7, reference numeral 1 denotes an axial fan, which is attached to the case 2. The case 2 divides the suction side and the discharge side with respect to the axial fan 1 and surrounds the axial fan 1 with a predetermined interval in order to facilitate the air flow from the suction side to the discharge side. A formed mouth ring 3 is provided.
[0005]
Further, although there is no clear description of the portion of the case 2 to which the axial fan 1 is attached, it is natural that the case 2 has a support portion to which the axial fan 1 is attached. Generally, a motor support portion 4 having a diameter substantially the same as the boss diameter of the fan 1 is provided.
[0006]
FIG. 8 is a cross-sectional view of a blower that achieves low noise and high wind pressure. In FIG. 8, a case 5 surrounds the axial flow fan 1 with a mouth ring 6 at a predetermined interval, has an opening 7 facing the axial flow fan 1, and forms a bag-shaped space 8.
[0007]
[Problems to be solved by the invention]
However, when the conventional blower as shown in FIG. 7 is applied to a cooling device such as a refrigerator and disposed close to the cooler, water melted by dew condensation or defrost due to moisture from the outside of the refrigerator is the axial flow fan 1. Freezing progresses while adhering to the mouth ring 3 and generates contact noise due to freezing, resulting in loud noise in the entire cooling device, or it can reach a restrained state and keep the storage room at a predetermined temperature stably. This causes the problem of disappearing.
[0008]
When the conventional blower as shown in FIG. 8 is arranged close to the cooler, water melted by condensation or defrost enters from the opening 7 of the mouth ring 6, and the bag-like space 8 of the case 5. This causes the same problem as that described above, in which the water freezes and freezes.
[0009]
SUMMARY OF THE INVENTION The present invention solves the conventional problem, and prevents an increase in the noise of the blower due to the progress of freezing and the occurrence of a restrained state. It is an object to provide a cooling device that can be stably maintained at a temperature.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention includes an axial fan and a case including a mouth ring that forms a bag-like space around the axial fan at a predetermined interval. A blower provided with a drain hole in the bag-like space portion, wherein the case has a square shape, and a plurality of the drain holes are provided at least on a diagonal line. Even if it enters through the opening and accumulates in the case, it has the effect of discharging water from the drain hole, and there is an effect of setting the position of the drain hole without limiting the direction in which the blower is attached.
[0018]
The invention according to claim 2 is characterized in that the blower according to claim 1 is mounted in a cooling atmosphere of a cooler so that the drain hole is at the bottom of the case when the case is mounted at the mounting position. Even if it does not limit the direction in which a blower is attached, there is an effect that the position of the drain hole is set to the lowest part.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a blower and a cooling device including the blower according to the present invention will be described with reference to the drawings.
[0022]
(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of a refrigerator that is a cooling device including a blower according to Embodiment 1 of the present invention. FIG. 2 is a front view of a blower used for the refrigerator of the embodiment. FIG. 3 is a cross-sectional view of a blower used in the refrigerator of the same embodiment.
[0023]
In FIG. 1, 9 is a refrigerator main body as an example of a cooling device, 10 is a refrigerator room provided in the refrigerator main body 9, and a cooler 11 is disposed on the back side of the refrigerator room 10 so as to cover the cooler 11. Further, an in-compartment rear duct 12 that forms an air passage for circulating cool air is attached, and a blower 13 is attached to the in-compartment rear duct 12.
[0024]
2 and 3, the blower 13 includes an axial fan 14 and a case 15, and the axial fan 14 is attached to a motor support portion 16 located at the center of the case 15. The case 15 divides the suction side and the discharge side with respect to the axial fan 14, and surrounds the axial fan 14 with a predetermined interval in order to facilitate the air flow from the suction side to the discharge side. A mouth ring 17 is formed, and a draining portion 18 having a flange shape larger than the boss diameter of the axial fan 14 is provided on the outer peripheral portion of the motor support portion 16.
[0025]
About the refrigerator comprised as mentioned above, the operation | movement is demonstrated below.
[0026]
Since the blower 13 is disposed close to the cooler 11, the blower 13 is cooled to below zero degrees by the cold air generated in the cooler 11, and is condensed by moisture from outside the chamber, or water melted by defrosting adheres thereto. At this time, the water adhering to the motor support portion 16 of the case 15 falls down along the flange-shaped draining portion 18, so that the water does not enter the axial flow fan 14 and the water enters and freezes. It can be prevented. For this reason, generation | occurrence | production of the contact sound which a fan and ice contact, and it can prevent falling into an uncoolable by the fan restraint by icing, and a reliable forced ventilation type refrigerator can be provided.
[0027]
In addition, by performing a hydrophilic treatment on the surface of the case 15, water attached to the motor support portion 13 and the mouth ring 17 can easily flow, and draining can be performed smoothly.
[0028]
In addition, if the blower 13 is rotated immediately before the end of the defrosting, the ambient temperature of the blower 13 is increased by the heat generation action of the motor, and the frost and ice remaining on the blower 13 can be melted without being melted by the defrosting. This is effective in preventing further freezing.
[0029]
(Embodiment 2)
4 is a front perspective view of a main part of a refrigerator that is a cooling device provided with a blower according to Embodiment 2 of the present invention, FIG. 5 is a front view of the blower applied to the refrigerator of the same embodiment, and FIG. It is sectional drawing of the air blower applied to the refrigerator of a form.
[0030]
In FIG. 4, a blower 19 is attached to the interior rear duct 12 that forms an air passage for circulating cool air so as to cover the cooler 11.
[0031]
5 and 6, the blower 19 includes an axial fan 20 and a rectangular case 21, and the axial fan 20 is attached to a motor support portion 22 located at the center of the case 21. The case 21 includes a mouth ring 23. The mouth ring 23 defines a suction side and a discharge side with respect to the axial fan 20, and surrounds the axial fan 20 with a predetermined interval to reduce noise. In order to increase the wind pressure, the bag-like space 25 is formed with the opening 24 facing the axial fan 20.
[0032]
Further, the case 21 is provided with water drain holes 26 at diagonal corners, and the blower 19 is inclined and attached to the interior rear duct 12 so that the water drain holes 26 are on the lower side. Further, the blower 19 is attached to the interior rear duct 12 so that the drain hole 26 faces the cooler 11.
[0033]
About the refrigerator comprised as mentioned above, the operation | movement is demonstrated below.
[0034]
Since the blower 19 is disposed close to the cooler 11, the water cooled by the cool air generated by the cooler 11 to below zero degrees is condensed by moisture from the outside of the cabinet, or the water melted by defrosting is the mouth ring 23. And is accumulated in the bag-like space 25 of the case 21. At this time, since the blower 19 is mounted to be inclined toward the drain hole 26, the horizontal sides that are in contact with the upper and lower sides of the rectangular case are also inclined, and the water accumulated in the bag-like space 25 is drained along the horizontal side. It becomes easy to flow toward the hole 26, and it is possible to prevent a state in which freezing proceeds while water remains in the bag-like space 25.
[0035]
Further, since the blower 19 is tilted so that the drain hole 26 faces the cooler 11, the water easily flows into the drain hole 21, and the water flowing out from the drain hole 26 is provided in the lower part of the cooler 11. It can be discharged to the outside through a drain hole (not shown).
[0036]
In order to attach the blower 19 based on the position of the drain hole 26, the direction of the blower is fixed at the same time. However, if a plurality of drain holes 26 are provided at least on the diagonal line, the direction of the blower is fixed. It is possible to provide a degree of freedom in installation.
[0037]
Further, in the present embodiment, the case 21 is rectangular, but the case 21 is not limited to this. For example, a circular shape can be used. Water can be guided to the drain hole 26.
[0038]
In the above embodiments, the refrigerator has been described. However, as described above, the cooling function is exhibited not only by the refrigerator (including a freezer) but also by a cooler such as a showcase, an ice maker, a vending machine, and various air conditioners. If it is a cooling device, the same effect will be acquired in the same structure.
[0039]
【The invention's effect】
As described above, the invention according to claim 1 is constituted by an axial fan and a case including a mouth ring that forms a bag-like space around the axial fan at a predetermined interval. A blower provided with a drain hole in the bag-like space portion of the case, wherein the case has a square shape, and a plurality of the drain holes are provided at least on a diagonal line. Even if it is placed in the atmosphere, the case where water has accumulated in the case can be prevented from freezing, preventing contact noise and restraint from occurring due to freezing, and freedom to use the blower. Can be given .
[0047]
The invention according to claim 2 is characterized in that the blower according to claim 1 is mounted in a cooling atmosphere of a cooler so that the drain hole is at the bottom of the case when the case is mounted at the mounting position. Even if it does not limit the direction in which a blower is attached, the position of the drain hole is set to the lowest part, so that a degree of freedom can be given to the attachment of the blower.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a refrigerator according to a first embodiment of the present invention. FIG. 2 is a front view of a blower of the refrigerator according to the first embodiment. FIG. 5 is a front view of a main part of the refrigerator according to the second embodiment of the present invention. FIG. 5 is a front view of the fan of the refrigerator according to the embodiment. FIG. 6 is a cross-sectional view of the fan according to the embodiment. Cross-sectional view of conventional fan [Fig. 8] Cross-sectional view of conventional blower [Explanation of symbols]
9 Refrigerator 11 Cooler 13, 19 Blower 14, 20 Axial fan 15, 21 Case 16, 22 Motor support portion 17, 23 Mouth ring 18 Drain portion 25 Bag-shaped space portion 26 Drain hole

Claims (2)

軸流ファンと、前記軸流ファンの周囲を所定の間隔をおいて袋状空間部を形成するマウスリングを備えたケースとで構成され、前記ケースの袋状空間部には水抜穴が設けられた送風機であって、前記ケースを方形とし、前記水抜穴は少なくとも対角線上に複数個設けられたことを特徴とする送風機。 An axial fan and a case provided with a mouth ring that forms a bag-like space around the axial fan at a predetermined interval, and a drain hole is provided in the bag-like space of the case. A blower characterized in that the case has a square shape and a plurality of drain holes are provided at least on a diagonal line. 請求項１に記載の送風機を水抜穴が、ケースを取付け位置に取付けた時に前記ケースの最下部になるよう冷却器の冷却雰囲気中に取り付けたことを特徴とする送風機を備えた冷却機器。A cooling device provided with a blower , wherein the blower according to claim 1 is mounted in a cooling atmosphere of a cooler so that a drain hole becomes a lowermost part of the case when the case is mounted at a mounting position .
JP2000330252A 2000-10-30 2000-10-30 Blower and cooling device equipped with a blower Expired - Lifetime JP4649723B2 (en)

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JP2011226725A (en) * 2010-04-22 2011-11-10 Panasonic Corp Indoor unit of air conditioner
JP5849524B2 (en) 2011-08-19 2016-01-27 日本電産株式会社 Axial flow fan
JP2017096546A (en) * 2015-11-24 2017-06-01 パナソニックＩｐマネジメント株式会社 refrigerator
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CN109869353A (en) * 2019-02-28 2019-06-11 中铁十八局集团有限公司 A kind of structure reducing large ventilator group noise
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