JP4989375B2 - Soundproof structure of soundproof box opening in soundproof work equipment - Google Patents
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- 238000001816 cooling Methods 0.000 description 14
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Description
本発明は，防音型作業機における防音箱開口部の防音構造に関し，より詳細には，騒音発生源となるモータ，エンジン，冷却ファン等の機器を防音箱内に収容した防音型作業機において，前記防音箱に冷却風の吸排気口等として設けられた開口部から騒音が外部へ漏出することを防止するための，防音箱開口部の防音構造に関する。 The present invention relates to a soundproof structure of a soundproof box opening in a soundproof work machine, and more specifically, in a soundproof work machine in which devices such as a motor, an engine, and a cooling fan that are noise sources are housed in a soundproof box, The present invention relates to a soundproof structure for a soundproof box opening for preventing noise from leaking to the outside from an opening provided as an inlet / outlet for cooling air in the soundproof box.
圧縮機や発電機等の各種作業機において，このような作業機を構成する機器より生じる騒音，例えば駆動源であるエンジンやモータ，構成機器を冷却するための冷却ファン等から発生した騒音が機外へ漏出することを防止するために，作業機の各構成部品を防音箱内に収容した防音型作業機が知られている。 In various working machines such as compressors and generators, noise generated from equipment constituting such a working machine, for example, noise generated from an engine or motor as a driving source, a cooling fan for cooling the constituent equipment, etc. In order to prevent leakage to the outside, a soundproof working machine in which each component of the working machine is housed in a soundproof box is known.
そして，このような防音型作業機にあっては，各構成機器を収容した防音箱内を冷却するために，冷却風の流れを生じさせる冷却ファンを設けると共に，冷却風を防音箱内に導入し，また，防音箱内を冷却した冷却風を機外に排出するための吸排気口となる開口部を，前記防音箱の側壁に設けている。 In such a soundproof type work machine, in order to cool the inside of the soundproof box containing each component device, a cooling fan for generating a flow of cooling air is provided and the cooling air is introduced into the soundproof box. In addition, an opening serving as an intake / exhaust port for discharging the cooling air that has cooled the inside of the soundproof box to the outside of the apparatus is provided on the side wall of the soundproof box.
ところで，このようにして防音箱の側壁に形成された開口部は，冷却風の吸排気のみならず防音箱内で発生した騒音の漏出口とも成り得ることから，この開口部を介した騒音の漏出を防止するための各種の防音対策が採られている。 By the way, the opening formed in the side wall of the soundproof box in this way can be used not only for intake / exhaust of cooling air but also a leak outlet for the noise generated in the soundproof box. Various soundproofing measures are taken to prevent leakage.
このような防音対策の一例として，開口部１１を，幅方向を防音箱１０の内側に向かって上向きに傾斜させた複数枚のルーバ２０によって，上段のルーバの下端が，下段のルーバの上端よりも低位置に配置されるように覆うことで，防音箱１０内で発生した騒音をこのルーバ２０との衝突によって減衰する一方，ルーバ２０間に設けた間隔Ａによって冷却風の吸排出路を確保することが行われている（図９参照）。 As an example of such a soundproofing measure, the lower end of the upper louver is made higher than the upper end of the lower louver by a plurality of louvers 20 whose opening 11 is inclined upward in the width direction toward the inside of the soundproof box 10. In addition, the noise generated in the soundproof box 10 is attenuated by the collision with the louver 20 by covering it so as to be disposed at a low position, while a cooling air intake / exhaust path is secured by the interval A provided between the louvers 20. (See FIG. 9).
なお，以上のように開口部１１をルーバ２０で覆った防音構造において，図１０に示すようにルーバ２０を横断面台形状に形成し，上下で対向するルーバ２０の下面と上面とを互いに異なる傾斜角度とすることにより，ルーバ側に向けて水平方向に伝播されてくるエンジンや冷却ファンの騒音を，互いに異なる傾斜角度に設定された面によって下方または上方に向きを変えて外部に放出することで，エンジン，冷却ファン等による騒音を地面，上空等の不規則な方向に伝播させ，作業現場の周囲の住宅，作業現場の作業者等に対する騒音を緩和することができるようにしたものも提案されている（特許文献１参照）。 In the soundproof structure in which the opening 11 is covered with the louver 20 as described above, the louver 20 is formed in a trapezoidal cross section as shown in FIG. 10, and the lower surface and the upper surface of the louver 20 that are vertically opposed to each other are different from each other. By setting the tilt angle, the noise of the engine and cooling fan that propagates in the horizontal direction toward the louver side is directed downward or upward by surfaces set at different tilt angles and released to the outside. Also proposed is a system that can mitigate noise to houses around the work site, workers at the work site, etc. by propagating noise from the engine, cooling fan, etc. in irregular directions such as the ground and sky. (See Patent Document 1).
この発明の先行技術文献情報としては次のものがある。
以上のように，開口部１１をルーバ２０で覆う防音構造において，騒音発生源３０と開口部１１とが略同一の高さに設けられている場合には，騒音発生源３０からルーバ２０が設けられた開口部１１を介して外部に漏出しようとする騒音は，図９に示すようにルーバ２０やルーバ２０に貼着された吸音材４０によって吸収乃至は減衰されることから，外部に直接漏出することはない。 As described above, in the soundproof structure in which the opening 11 is covered with the louver 20, when the noise generating source 30 and the opening 11 are provided at substantially the same height, the louver 20 is provided from the noise generating source 30. As shown in FIG. 9, noise that leaks to the outside through the formed opening 11 is absorbed or attenuated by the louver 20 or the sound absorbing material 40 attached to the louver 20, so that it leaks directly to the outside. Never do.
しかし，開口部１１を覆うルーバは，図９又は図１１に示すように例えば雨水等がかかった際に，防音箱１０内にこの雨水等を導入することなく機外に排出することができるように，防音箱１０の内側に向かって上向きに傾斜した配置となっている。 However, as shown in FIG. 9 or FIG. 11, the louver covering the opening 11 can be discharged outside the apparatus without introducing rainwater or the like into the soundproof box 10 when rainwater or the like is applied. In addition, the soundproof box 10 is inclined upward toward the inside.
そのため，例えば図１１に示すように，騒音発生源３０に対して開口部１１（その一部）が相対的に低い位置に設けられている場合，騒音発生源３０に対して相対的に低い位置で開口部１１を塞ぐルーバ２０（図示の例では，２０ｎ−３，２０ｎ−２，２０ｎ−１，２０ｎ）が，騒音の伝播方向と近似した傾斜を有しているために，騒音がルーバ２０に遮られることなくルーバ２０間の間隔Ａを直接通過して機外に漏出することとなる。 Therefore, for example, as shown in FIG. 11, when the opening 11 (part thereof) is provided at a relatively low position with respect to the noise source 30, the position is relatively low with respect to the noise source 30. The louver 20 (20n-3, 20n-2, 20n-1, 20n in the illustrated example) that closes the opening 11 has an inclination approximate to the noise propagation direction. Without being obstructed, the gap A between the louvers 20 passes directly and leaks out of the machine.
なお，このように，騒音発生源３０に対して相対的に低い位置に開口部１１を設けた場合，これをルーバ２０によって覆っても，このルーバ２０間の間隔Ａより騒音が漏出するという現象は，特許文献１として紹介した，断面台形状のルーバによっても同様に生じる現象である。 In this way, when the opening 11 is provided at a relatively low position with respect to the noise generating source 30, even if this is covered by the louver 20, noise leaks from the interval A between the louvers 20. Is a phenomenon similarly caused by a trapezoidal louver section introduced as Patent Document 1.
このようにして，ルーバ２０の傾きと平行方向を成す伝播経路によって機外に漏出した騒音は，その後，防音型作業機１の設置面と衝突することとなり，この設置面との衝突によって一部減衰されることから，ルーバ２０が設けられていない開口部１１から，水平方向に直接漏出する騒音に比べれば感じ取られる「うるささ」は緩和されたものとなる。 In this way, the noise leaked outside the machine through the propagation path that is parallel to the inclination of the louver 20 will then collide with the installation surface of the soundproof work machine 1, and partly due to this collision with the installation surface. Since it is attenuated, the “noisiness” felt compared to the noise leaking directly in the horizontal direction from the opening 11 where the louver 20 is not provided is alleviated.
しかし，このような防音型作業機１の周辺で作業する者が感じるうるささは，防音型作業機１より数メートル離れた位置に立った状態で聞こえる騒音であり，地面で反射した騒音も，作業等を行う者にとって「うるささ」と感じられる。 However, the annoyance felt by those who work around the soundproofing work machine 1 is the noise that can be heard standing in a position several meters away from the soundproofing work machine 1, and the noise reflected from the ground is It feels “noisy” for those who do the same.
このように作業者が感じる騒音を測定するために，一例として防音型作業機の中心から４ｍ離れ、高さ１．５ｍの位置に騒音測定装置の受音部を設けて騒音を測定すると，受音部では騒音発生源からの騒音を直接受音するのみでなく，設置面で反響した騒音も受音していることが確認できる。 In order to measure the noise felt by the worker in this way, for example, if the sound receiving part of the noise measuring device is provided at a position of 4 m away from the center of the soundproof work machine and the height is 1.5 m, the noise is measured. It can be confirmed that the sound part not only directly receives the noise from the noise source but also receives the noise reflected on the installation surface.
そのため，このようにルーバ２０間をすり抜け，設置面で反射される騒音の漏出を防止することは，この種防音型作業機１が発する騒音の低減に有効であり，特に，防音型作業機１を，音を反射し易い材質の設置面上で運転する場合には，極めて有効である。 For this reason, it is effective to reduce the noise generated by this type of soundproofing working machine 1 to prevent the noise reflected from the installation surface from passing through the louvers 20 in this way. Is extremely effective when operated on an installation surface made of a material that easily reflects sound.
そこで本発明は，上記従来技術における欠点を解消するためになされたものであり，騒音発生源３０に対して防音箱１０の開口部１１の全部又は一部が相対的に低い位置に設けられている場合であっても，この開口部１１を介した騒音の漏出を防止することのできる開口部の防音構造を提供することを目的とする。 Therefore, the present invention has been made to eliminate the above-described drawbacks of the prior art, and all or part of the opening 11 of the soundproof box 10 is provided at a relatively low position with respect to the noise source 30. Even if it is a case, it aims at providing the soundproof structure of the opening part which can prevent the leakage of the noise through this opening part 11. FIG.
上記目的を達成するために，本発明の防音箱開口部の防音構造は，騒音発生源３０となる機器を収容すると共に，少なくともその一部が前記騒音発生源３０に対して相対的に低い位置の側壁に形成された開口部１１を備えた防音箱１０において，
前記開口部１１を，前記防音箱１０の内側方向に幅方向の上端縁を上向きに傾斜する複数のルーバ２０（２０１，２０２，２０３・・・２０ｎ）を上段のルーバの下端縁が，下段のルーバの上端縁よりも低い位置となるよう並設して被覆すると共に，下段のルーバの上端縁と，上段のルーバの下端縁とを結ぶ線と側壁とが成す角をθ１と，側壁に対する騒音の入射角をθと，上段のルーバの上端縁と下段のルーバの下端縁とを結ぶ線と側壁とが成す角をθ２とした場合，θ１＞θ＞θ２となる入射角θで騒音が入射される範囲の側壁に設けたルーバに，前記幅方向の上端縁（２０１ａ，２０２ａ，２０３ａ・・・２０ｎａ）から，前記ルーバの延長線Ｌ上（図８）に対して防音箱１０内側に向かって下向きの角度で，前記側壁方向へ延長する，例えば，前記ルーバと一体又はこれに連続する板体などから成る，遮蔽部２１（２１１，２１２，２１３・・・２１ｎ）を設け，θ≧θ１となる入射角θで騒音が入射される範囲の側壁に設けたルーバには前記遮蔽部２１を設けないことを特徴とする（請求項１）。
In order to achieve the above object, the soundproof structure of the soundproof box opening of the present invention accommodates a device to be the noise generation source 30, and at least a part of the soundproof structure is relatively low with respect to the noise generation source 30. In the soundproof box 10 having the opening 11 formed in the side wall of
A plurality of louvers 20 (201, 202, 203... 20n) that incline the upper end edge in the width direction in the inner direction of the soundproof box 10 and the lower end edge of the upper louver Cover and cover the louver so that it is lower than the upper edge of the louver. The angle formed by the line connecting the upper edge of the lower louver and the lower edge of the upper louver and the side wall is θ 1 , and the incident angle of the noise theta, if the angle made by the upper line and the side wall connecting the lower edge of the upper edge and the lower louvers of the louver and the θ 2, θ 1>θ> θ 2 become incident angle theta In the soundproof box from the upper edge (201a, 202a, 203a... 20na) in the width direction to the extension line L (FIG. 8) of the louver. 10 Extends toward the side wall at a downward angle toward the inside, For example, a shielding unit 21 (211, 212, 213... 21 n) made of a plate body integrated with or continuous with the louver is provided, and a range in which noise is incident at an incident angle θ satisfying θ ≧ θ 1. The louver provided on the side wall is not provided with the shielding portion 21 (Claim 1).
前記遮蔽部２１（２１１，２１２・・・２１ｎ）の構成である，前記ルーバ２０の傾斜角に対する傾斜には，遮蔽部２１（２１１，２１２・・・２１ｎ）を水平方向に設ける場合を含む（請求項２：図１〜３参照）。 The inclination of the louver 20 with respect to the inclination angle of the shielding portion 21 (211, 212... 21 n) includes the case where the shielding portion 21 (211, 212... 21 n) is provided in the horizontal direction ( Claim 2: See FIGS.
この遮蔽部２１（２１１，２１２・・・２１ｎ）は，各ルーバ間の間隔Ａに対して０．８倍以上の長さで設けるものとすれば好適である（請求項３）。 This shielding part 21 (211, 212... 21n) is preferably provided with a length of 0.8 times or more with respect to the interval A between the louvers (claim 3).
以上で説明した本発明の構成により，本発明の防音箱開口部の防音構造によれば，騒音発生源３０に対して相対的に低い位置に設けられた開口部を覆うルーバ２０に前述の遮蔽部２１を設けたことにより，ルーバ２０に衝突することなく，ルーバ２０間の間隔Ａをすり抜けて直接行われる騒音の漏出を好適に防止することができた。 With the configuration of the present invention described above, according to the soundproof structure of the soundproof box opening of the present invention, the above-described shielding is applied to the louver 20 that covers the opening provided at a relatively low position with respect to the noise source 30. By providing the portion 21, it was possible to suitably prevent noise leakage directly through the interval A between the louvers 20 without colliding with the louvers 20.
その結果，機外において「うるささ」として感じられる，防音型作業機１の設置面で反射されて伝播される騒音の漏出を減少することができ，防音型作業機１の周囲で感じられる騒音を大幅に低減することができた。 As a result, it is possible to reduce leakage of noise that is reflected and propagated on the installation surface of the soundproofing work machine 1 that is felt as “noisy” outside the machine, and noise that is felt around the soundproofing work machine 1 can be reduced. It was possible to greatly reduce.
遮蔽部２１を防音箱の中央側に向かって下向きに傾斜した形状とすることで，騒音発生源３０からの騒音の入射角θ（図２又は図４参照）とルーバ２０の傾斜角α（図２又は図４参照）とが近似する場合であっても，遮蔽部２１を水平方向に配置する場合に比較して短くすることができた。 By forming the shielding portion 21 into a shape inclined downward toward the center of the soundproof box, the incident angle θ of noise from the noise generating source 30 (see FIG. 2 or FIG. 4) and the inclination angle α of the louver 20 (see FIG. 2 or FIG. 4) can be made shorter than the case where the shielding portion 21 is arranged in the horizontal direction.
その結果，防音箱開口部の防音構造をコンパクトなものとすることができ，パッケージの小型化に寄与することができた。 As a result, the soundproof structure of the soundproof box opening can be made compact, contributing to the downsizing of the package.
また，遮蔽部２１の長さを，ルーバ２０間の間隔Ａに対して０．８倍以上とすることで，ルーバ間に形成された間隔Ａのうち，騒音の伝播通路となり得る部分の大部分を遮蔽することができた。 Further, by setting the length of the shielding part 21 to be 0.8 times or more the interval A between the louvers 20, most of the portion that can be a noise propagation path in the interval A formed between the louvers. Could be shielded.
なお，開口部１１が防音箱１０の側壁の高さ方向の比較的広い範囲に設けられている場合等，１つの開口部１１に，騒音発生源３０と同程度の高さの部分と，騒音発生源３０に対して相対的に低い位置に形成された部分とが混在する場合には，騒音発生源３０と同程度の高さにおいて開口部１１を覆うルーバに対しても遮蔽部２１を設けると，この遮蔽部２１に誘導されて却って騒音の漏出が助長される場合があることから（図５参照），前述のように，騒音発生源３０に対して所定の低い位置において開口部１１を覆うルーバに対してのみ，前記遮蔽部２１を設けることで，このような騒音の漏出を助長することなく，騒音の低減作用のみを有する防音箱開口部の防音構造を提供することができた。 When the opening 11 is provided in a relatively wide range in the height direction of the side wall of the soundproof box 10, a portion having the same height as that of the noise source 30, and noise When a portion formed at a relatively low position with respect to the generation source 30 coexists, the shielding portion 21 is also provided for the louver covering the opening portion 11 at the same height as the noise generation source 30. Then, since the leakage of noise may be promoted by being guided by the shielding part 21 (see FIG. 5), the opening 11 is set at a predetermined low position with respect to the noise source 30 as described above. By providing the shielding part 21 only for the covering louver, it was possible to provide a soundproofing structure for the soundproofing box opening having only a noise reducing action without promoting such noise leakage.
次に本発明の実施例を，添付図面を参照しながら以下に説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
本発明における防音箱開口部の防音構造が，図１に示すように防音箱１０に設けた開口部１１を，細長い矩形状を成す複数枚のルーバ２０（２０１〜２０ｎ）によって覆っていること，このルーバ２０（２０１〜２０ｎ）の幅方向を，防音箱１０の内側に向かって上向きに傾斜させて平行に配置している点，並びに上段のルーバ（例えば２０２）の下端縁２０２ｂが，その下段のルーバ（例えば２０３）の上端縁２０３ａよりも低位置に配置されている点では，図９を参照して説明した従来の開口部１１の防音構造と同様である。 The soundproof structure of the soundproof box opening in the present invention covers the opening 11 provided in the soundproof box 10 as shown in FIG. 1 by a plurality of louvers 20 (201 to 20n) having an elongated rectangular shape, A point in which the width direction of the louver 20 (201 to 20n) is inclined in parallel toward the inner side of the soundproof box 10 and the lower end edge 202b of the upper louver (for example, 202) is the lower tier. This is the same as the conventional soundproof structure of the opening 11 described with reference to FIG. 9 in that the louver (for example, 203) is disposed at a position lower than the upper edge 203a.
しかし，本発明の防音箱開口部１１の防音構造にあっては，少なくともその一部分が，騒音発生源３０に対して相対的に低い位置に形成されている開口部１１を介した騒音の漏出を防止するものであると共に，このように騒音発生源３０に対して相対的に低い位置にある開口部１１を介した騒音の漏出を防止するために，前記開口部１１を覆うルーバ２０（２０１〜２０ｎ）の，防音箱内側に向いた上端縁（２０１ａ〜２０ｎａ）に，前記ルーバ２０（２０１〜２０ｎ）の幅方向を延長する，遮蔽部２１（２１１〜２１ｎ）を設け，この遮蔽部２１（２１１〜２１ｎ）によってルーバ２０（２０１〜２０ｎ）間の間隔Ａを介して騒音が漏出することを防止している（図１参照）。 However, in the soundproof structure of the soundproof box opening 11 according to the present invention, at least a part of the soundproof structure prevents noise leakage through the opening 11 formed at a relatively low position with respect to the noise generating source 30. In order to prevent the leakage of noise through the opening 11 located at a relatively low position with respect to the noise generation source 30 as described above, the louver 20 (201 to 201) covering the opening 11 is used. 20n) is provided at the upper edge (201a-20na) facing the inside of the soundproof box with a shielding part 21 (211-21n) extending the width direction of the louver 20 (201-20n). 211 to 21n) prevents noise from leaking through the interval A between the louvers 20 (201 to 20n) (see FIG. 1).
図１に示す実施形態にあっては，このような遮蔽部２１（２１１〜２１ｎ）として，ルーバ２０（２０１〜２０ｎ）の防音箱内側の上端縁（２０１ａ〜２０ｎａ）よりそれぞれ水平方向に突出する前記ルーバに連続する板体から成る遮蔽部２１１〜２１ｎを形成し，ルーバ間に形成された間隔Ａを直接通過して防音箱外に漏出する騒音を，この遮蔽部２１１〜２１ｎに衝突させて減衰乃至は反射させることで，機外へ直接漏出することを防止している。 In the embodiment shown in FIG. 1, such shielding portions 21 (211 to 21 n) protrude in the horizontal direction from the upper end edges (201 a to 20 na) inside the soundproof box of the louvers 20 (201 to 20 n). Shielding portions 211 to 21n made of a plate continuous to the louver are formed, and noise leaking out of the soundproof box through the interval A formed between the louvers is caused to collide with the shielding portions 211 to 21n. Attenuation or reflection prevents direct leakage outside the machine.
図２に示すように，遮蔽部２１を水平方向に形成した場合には，この遮蔽部２１を，ルーバ間の間隔Ａに対して０．８倍，またはそれ以上の長さに形成することが好ましく，この遮蔽部２１の長さは，防音箱１０内に配置された騒音発生源３０と，ルーバ２０を設ける開口部１１の形成位置との高さ方向における相対的な位置関係に従って変更しても良く，図２に示す騒音の入射角（騒音発生源の中心を通る線と，開口が形成された側壁とが成す角）θが，ルーバの傾斜角αと一致する位置で最大として，前記遮蔽部２１の長さを異なるものとしても良い。 As shown in FIG. 2, when the shielding part 21 is formed in the horizontal direction, the shielding part 21 may be formed with a length 0.8 times or more than the interval A between the louvers. Preferably, the length of the shielding portion 21 is changed in accordance with the relative positional relationship in the height direction between the noise generating source 30 arranged in the soundproof box 10 and the formation position of the opening 11 where the louver 20 is provided. As shown in FIG. 2, the incident angle of noise (the angle formed by the line passing through the center of the noise source and the side wall where the opening is formed) θ is maximized at a position where the angle coincides with the inclination angle α of the louver. The length of the shielding part 21 may be different.
この遮蔽部２１は，例えば開口部１１が防音箱側壁の高さ方向に比較的広い範囲で設けられている場合等，１つの開口部１１に，騒音発生源３０と同等の高さの部分と，騒音発生源３０に対し，相対的に低い位置に配置された部分とが混在する場合には，開口部１１を覆うルーバ２０の全てに前記遮蔽部２１を設ける必要はなく，例えば図３に示すように，騒音発生源３０に対して所定の低い位置で前記開口部１１を覆うルーバ２１（図示の例では２０６，２０７・・・２０ｎ）に対してのみ遮蔽部２１を設けることが好ましい。 For example, when the opening 11 is provided in a relatively wide range in the height direction of the soundproof box side wall, the shielding part 21 includes a portion having a height equivalent to that of the noise generating source 30 in one opening 11. In the case where a portion arranged at a relatively low position with respect to the noise generating source 30 is mixed, it is not necessary to provide the shielding portion 21 on all the louvers 20 covering the opening portion 11, for example, as shown in FIG. As shown, it is preferable to provide the shielding part 21 only for the louver 21 (206, 207... 20n in the illustrated example) that covers the opening 11 at a predetermined low position with respect to the noise source 30.
前記遮蔽部２１を設けるルーバ２０の範囲は，一例として図４に示すように下段のルーバ２０７の上端縁２０７ａと，上段のルーバ２０６の下端縁２０６ｂとを結ぶ線と側壁とが成す角をθ１と，側壁に対する騒音の入射角をθと，上段のルーバ２０６の上端縁２０６ａと，下段のルーバ２０７の下端縁２０７ｂとを結ぶ線と側壁とが成す角をθ２とした場合，前記騒音の入射角θが，θ１＞θ＞θ２で騒音の入射を受ける位置の側壁に設けたルーバとすることができる。 Range of louver 20 to provide a pre-Symbol shielding unit 21 includes an upper end edge 207a of the lower louver 207 as shown in FIG. 4 as an example, the angle between a line and a side wall connecting the lower edge 206b of the upper louver 206 When θ 1 is θ, the incident angle of noise to the side wall is θ, and the angle between the side wall and the line connecting the upper edge 206a of the upper louver 206 and the lower edge 207b of the lower louver 207 is θ 2 , The louver may be provided on the side wall of the position where the noise incident angle θ is θ 1 >θ> θ 2 and the noise is received.
騒音発生源３０に対して同程度の高さ位置に配置されているルーバでは，従来技術の説明として図９を参照して説明したように，騒音発生源３０からの騒音はルーバ２０と接触することなしに，直接，防音箱１０外に漏出することができず，遮蔽部２１を設けるまでもなくルーバ２０自体によって騒音の漏出防止が行われている。 In the louver disposed at the same height position with respect to the noise source 30, the noise from the noise source 30 contacts the louver 20 as described with reference to FIG. Without being able to leak directly out of the soundproof box 10, the louver 20 itself prevents noise leakage without providing the shielding part 21.
一方，前記騒音発生源３０と略同一の高さ位置に設けられたルーバ２０に対して，前述した遮蔽部２１を設ける場合，図５に示すように，この遮蔽部２１によって騒音が案内されて機外に漏出してしまう場合があり，この部分のルーバ２０に対する遮蔽部２１の形成は，むしろ騒音を誘導して防音箱外への漏出を助長する場合がある。 On the other hand, when the above-described shielding part 21 is provided for the louver 20 provided at substantially the same height as the noise generating source 30, noise is guided by the shielding part 21 as shown in FIG. There is a case where leakage occurs outside the machine, and the formation of the shielding portion 21 with respect to the louver 20 in this part may induce noise and promote leakage outside the soundproof box.
そこで，前述の遮蔽部２１は，これを，騒音発生源よりも所定の低い位置にあるルーバ２０，一例として，前述したθ1＞θ＞θ2となる入射角で騒音が伝播される位置に設けられたルーバ２０に対して行う（図３,図６参照）。 Therefore, the shielding unit 21 described above is arranged at a position where noise is propagated at an incident angle satisfying θ 1 >θ> θ 2 as described above, for example, the louver 20 at a predetermined lower position than the noise generation source. It performs with respect to the provided louver 20 (refer FIG. 3, FIG. 6).
なお，以上の図１〜図６を参照して説明したルーバ２０にあっては，前述の遮蔽部２１を，前記ルーバ２０の上端縁から前記ルーバの延長線Ｌ上（図８）の防音箱１０内側に向かって下向きの角度の内，水平方向の配置のものとして説明したが，この構成に限定されず，遮蔽部２１を前記ルーバの上端縁から前記ルーバの延長線Ｌ上の防音箱１０内側に向かって前記水平方向に至る角度内でルーバ２０と同方向に傾斜させた構成としても良い。 In the louver 20 described with reference to FIGS. 1 to 6, the above-described shielding portion 21 is provided on the extension line L of the louver (FIG. 8) from the upper edge of the louver 20. 10 is described as having a horizontal arrangement within a downward angle toward the inside. However, the present invention is not limited to this configuration, and the shielding portion 21 is arranged on the extension line L of the louver from the upper end edge of the louver. It is good also as a structure inclined in the same direction as the louver 20 within the angle which reaches the said horizontal direction toward an inner side.
また，図７に示すように，前記ルーバの上端縁から前記ルーバの延長線Ｌ上の防音箱１０内側で，前記水平方向から防音箱１０の内部側に向かってさらに下向きに傾斜するものとして構成しても良い。 Further, as shown in FIG. 7, it is configured such that it is further inclined downward from the horizontal direction toward the inner side of the soundproof box 10 inside the soundproof box 10 on the extension line L of the louver from the upper edge of the louver. You may do it.
このように，遮蔽部２１を，防音箱１０内側に向かって下向きに傾斜させた構成では，特に，前述した騒音の入射角θが，ルーバ２０の傾斜角αに近い場合に，遮蔽部２１の長さを短くすることができ，装置の小型化を実現できる点で有利である。 As described above, in the configuration in which the shielding part 21 is inclined downward toward the inside of the soundproof box 10, particularly when the incident angle θ of the noise described above is close to the inclination angle α of the louver 20, This is advantageous in that the length can be shortened and the device can be downsized.
例えば，図２に示したように，各ルーバ２０（２０１，２０２）の傾斜角αが４５°，騒音の入射角θが３０°である場合には，水平方向に形成された遮蔽部２１であっても，遮蔽部２１を０．８Ａ以上の長さとすることで，ルーバ２０間の間隔Ａを騒音が通過することを防止することができた。 For example, as shown in FIG. 2, when the inclination angle α of each louver 20 (201, 202) is 45 ° and the incident angle θ of noise is 30 °, the shielding portion 21 formed in the horizontal direction is used. Even in such a case, the noise can be prevented from passing through the interval A between the louvers 20 by setting the shielding portion 21 to a length of 0.8 A or more.
しかし，騒音発生源３０との相対的な位置関係が変化して，前述した騒音の入射角θが，ルーバの傾斜角αと同一の４５°になると，この入射角の騒音がルーバ間を通過することを完全に遮断しようとすれば，水平方向に形成された遮蔽部２１では，図８に示すように，その長さを√２Ａ以上（約１．５Ａ以上）とする必要がある。 However, when the relative positional relationship with the noise generation source 30 changes and the noise incident angle θ described above becomes 45 °, which is the same as the louver inclination angle α, the noise at this incident angle passes between the louvers. In order to completely block this, the shielding portion 21 formed in the horizontal direction needs to have a length of √2A or more (about 1.5A or more) as shown in FIG.
これに対し，図７に示すように，前述した遮蔽部２１を防音箱１０の内部側に向けて下向きに３０°傾斜させた場合には，遮蔽部２１の長さを，ルーバ間の距離Ａに対して若干長くする（約０．９４倍以上にする）ことにより，また，遮蔽部を４５°傾斜させた場合には，ルーバ２０間の距離Ａと同一長さ以上とすることにより，騒音がルーバ間の間隔Ａを直接通過することを略完全に防止することができる。 On the other hand, as shown in FIG. 7, when the shielding part 21 described above is inclined downward by 30 ° toward the inner side of the soundproof box 10, the length of the shielding part 21 is set to the distance A between the louvers. If the shielding part is inclined 45 °, the noise A is set to be equal to or longer than the distance A between the louvers 20. Can be almost completely prevented from passing directly through the distance A between the louvers.
なお，図１〜図８を参照して説明した実施形態にあっては，遮蔽部２１をいずれも水平に形成するか，又は一定角度で傾斜するものとして構成した例を示したが，例えば，各ルーバ２０が配置される高さ方向の位置に対応して，遮蔽部２１の傾斜角をそれぞれ異なるものとしても良い。 In the embodiment described with reference to FIGS. 1 to 8, an example in which the shielding portions 21 are both formed horizontally or inclined at a certain angle is shown. Corresponding to the position in the height direction where each louver 20 is arranged, the inclination angle of the shielding part 21 may be different.
この，開口部１１を覆うルーバ２０には，図１に示すように，吸音材４０を貼着して，騒音がこのルーバ２０と衝突すると，このルーバ２０に貼着された吸音材４０によって騒音が吸収乃至は減衰されるように構成しても良い。 As shown in FIG. 1, a sound absorbing material 40 is attached to the louver 20 covering the opening 11, and when noise collides with the louver 20, the noise is absorbed by the sound absorbing material 40 attached to the louver 20. May be absorbed or attenuated.
図示の実施形態にあっては，吸音材４０をルーバ２０に対してのみ設けているが，この吸音材４０は，各ルーバ２０のみならず，このルーバ２０に設けた前述の遮蔽部２１にも設けることができる。 In the illustrated embodiment, the sound absorbing material 40 is provided only for the louver 20, but the sound absorbing material 40 is not only provided for each louver 20 but also for the shielding portion 21 provided for the louver 20. Can be provided.
〔作用等〕
以上のように構成された本発明の防音型作業機１のルーバ２０において，防音箱１０内に収容した騒音発生源３０からの騒音が，防音箱１０に設けた開口部１１を介して機外に漏出しようとすると，この騒音は，開口部１１を塞ぐ各ルーバ２０と衝突して減衰され，また，このルーバ２０に吸音材が貼着されている場合には，この吸音材４０によって吸収されて防音箱１０外へ直接漏出することが防止されている。
[Action etc.]
In the louver 20 of the soundproofing work machine 1 of the present invention configured as described above, noise from the noise generation source 30 accommodated in the soundproof box 10 is externally transmitted through the opening 11 provided in the soundproof box 10. If the sound absorbing material is leaked, the noise is attenuated by colliding with each louver 20 closing the opening 11, and if a sound absorbing material is stuck to the louver 20, the noise is absorbed by the sound absorbing material 40. Therefore, it is possible to prevent leakage directly out of the soundproof box 10.
各ルーバ２０に設けられた遮蔽部２１は，騒音発生源３０に対して相対的に低い位置に設けられている開口部１１，又は開口部１１のうち，騒音発生源３０に対して相対的に低い位置で前記開口部１１を覆うルーバ２０に設けられており，騒音発生源３０で発生し，ルーバ２０に衝突することなく，ルーバ２０とルーバ２０間に形成された間隔Ａを介して直接機外に漏出しようとする騒音を遮断する。 The shielding part 21 provided in each louver 20 is relatively open to the noise generating source 30 among the opening 11 provided at a relatively low position with respect to the noise generating source 30 or the opening 11. It is provided in the louver 20 that covers the opening 11 at a low position, is generated by the noise generating source 30, and does not collide with the louver 20, but directly through the interval A formed between the louver 20 and the louver 20. Blocks noise that leaks outside.
従って，この遮蔽部２１に衝突した騒音は，この遮蔽部２１との衝突により吸収乃至は減衰し，また，吸収しきれずに反射した騒音は，さらにルーバ２０と衝突して吸収乃至は減衰されて，防音箱１０外に漏出する騒音が低減されている。 Therefore, the noise colliding with the shielding part 21 is absorbed or attenuated by the collision with the shielding part 21, and the noise reflected without being absorbed is further absorbed and attenuated by colliding with the louver 20. , The noise leaking out of the soundproof box 10 is reduced.
その結果，騒音発生源３０に対してその全部又は一部が相対的に低い位置に形成された開口部１１を備える防音箱１０にあっても，図１〜８を参照して説明したように，ルーバ２１の間隔Ａを通過して騒音が直接，防音箱１０外に漏出することを好適に防止することができた。 As a result, as described with reference to FIGS. 1 to 8, even in the soundproof box 10 including the opening 11 formed at a position relatively low in whole or in part with respect to the noise generating source 30. , It was possible to suitably prevent the noise from leaking directly out of the soundproof box 10 through the interval A of the louver 21.
防音箱に冷却風の吸排気口等として設けられた開口部から騒音の外部への漏出を防止することのできる防音型作業機に適応可能である。 The present invention can be applied to a soundproof working machine capable of preventing leakage of noise from an opening provided as an intake / exhaust port for cooling air in the soundproof box.
１ 防音型作業機
１０ 防音箱
１１ 開口部
２０（２０１〜２０ｎ） ルーバ
２０ａ（２０１ａ〜２０ｎａ） 上端縁（ルーバの防音箱内側方向）
２０ｂ（２０１ｂ〜２０ｎｂ） 下端縁（ルーバの）
２１（２１１〜２１ｎ） 遮蔽部
３０ 騒音発生源（冷却ファン）
４０ 吸音材
θ 騒音の入射角
α ルーバの傾斜角
DESCRIPTION OF SYMBOLS 1 Soundproof type working machine 10 Soundproof box 11 Opening part 20 (201-20n) Louver 20a (201a-20na) Upper end edge (inward direction of soundproof box of louver)
20b (201b-20nb) Lower edge (of louver)
21 (211-21n) Shield 30 Noise source (cooling fan)
40 Sound absorbing material θ Noise incident angle α Louver inclination angle
Claims (3)
前記開口部を，前記防音箱の内側方向に幅方向の上端縁を上向きに傾斜する複数のルーバを上段のルーバの下端縁が，下段のルーバの上端縁よりも低い位置となるよう並設して被覆すると共に，下段のルーバの上端縁と，上段のルーバの下端縁とを結ぶ線と側壁とが成す角をθ１と，側壁に対する騒音の入射角をθと，上段のルーバの上端縁と下段のルーバの下端縁とを結ぶ線と側壁とが成す角をθ２とした場合，θ１＞θ＞θ２となる入射角θで騒音が入射される範囲の側壁に設けたルーバに，前記幅方向の上端縁から，前記ルーバの延長線上に対して防音箱内側に向かって下向きの角度で，前記側壁方向へ延長する遮蔽部を設け，θ≧θ１となる入射角θで騒音が入射される範囲の側壁に設けたルーバには前記遮蔽部を設けないことを特徴とする防音箱開口部の防音構造。 In a soundproof box containing an apparatus which is a noise generation source and having an opening formed in a side wall which is at least a part of which is relatively low with respect to the noise generation source.
The openings are juxtaposed with a plurality of louvers that incline the upper edge in the width direction inward of the soundproof box so that the lower edge of the upper louver is lower than the upper edge of the lower louver. The angle between the line connecting the upper edge of the lower louver and the lower edge of the upper louver and the side wall is θ 1 , the incident angle of noise on the side wall is θ, and the upper edge of the upper louver in the case of the lower line and side walls connecting the lower edge of the louver and the angle theta 2 formed by, louvers provided on the side wall of the range noise with θ 1>θ> θ 2 become incident angle theta is incident , A shielding portion extending from the upper edge of the width direction toward the side of the side wall at a downward angle toward the inner side of the soundproof box with respect to the extension line of the louver, and noise at an incident angle θ satisfying θ ≧ θ 1 characterized in that it is not provided the shielding portion in the louver but provided on the side wall of the range to be incident Soundproof structure of soundproof box opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007224224A JP4989375B2 (en) | 2007-08-30 | 2007-08-30 | Soundproof structure of soundproof box opening in soundproof work equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007224224A JP4989375B2 (en) | 2007-08-30 | 2007-08-30 | Soundproof structure of soundproof box opening in soundproof work equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009057857A JP2009057857A (en) | 2009-03-19 |
| JP4989375B2 true JP4989375B2 (en) | 2012-08-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5027904B2 (en) * | 2010-05-14 | 2012-09-19 | デンヨー株式会社 | Engine-driven work machine with louvered vents |
| JP5537273B2 (en) * | 2010-06-09 | 2014-07-02 | 株式会社東芝 | Medium transport device |
| JP2014094412A (en) * | 2011-02-28 | 2014-05-22 | Sintokogio Ltd | Shot treatment device |
| JP6318060B2 (en) * | 2014-09-17 | 2018-04-25 | ヤンマー株式会社 | Engine system |
| JP7184677B2 (en) * | 2019-03-07 | 2022-12-06 | 積水化学工業株式会社 | soundproof panel |
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| JPS593156Y2 (en) * | 1978-04-28 | 1984-01-28 | 株式会社加藤製作所 | engine soundproofing device |
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