JPH0722009U - Silencer - Google Patents
SilencerInfo
- Publication number
- JPH0722009U JPH0722009U JP5603293U JP5603293U JPH0722009U JP H0722009 U JPH0722009 U JP H0722009U JP 5603293 U JP5603293 U JP 5603293U JP 5603293 U JP5603293 U JP 5603293U JP H0722009 U JPH0722009 U JP H0722009U
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- silencer
- expansion
- resonance
- sound
- frequency
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Abstract
(57)【要約】
【目的】 特定の周波数の音を効率よく消音する消音性
能を確保しつつ、よりコンパクトな消音器21を提供す
ることを目的とする。
【構成】 消音器21は接続部22と消音部23とフィ
ルタ部24とからなる。ルーツブロワに接続状とされる
消音器21の接続部22に近い方に膨張形消音器部23
aが備えられる。該膨張形消音器部23aに続いて連続
状に共鳴形消音器部23bが備えられる。
(57) [Abstract] [Purpose] An object of the present invention is to provide a more compact silencer 21 while ensuring the silencing performance of efficiently silencing sound of a specific frequency. [Structure] The silencer 21 includes a connection portion 22, a silencer portion 23, and a filter portion 24. The expansion-type silencer portion 23 is located closer to the connection portion 22 of the silencer 21 connected to the roots blower.
a is provided. A resonance type silencer portion 23b is continuously provided after the expansion type silencer portion 23a.
Description
【0001】[0001]
本考案は、ルーツブロワ等の流体機械に用いられ、特に吸込側の流体音を抑え るのに適する消音器に関するものである。 The present invention relates to a silencer which is used in a fluid machine such as a roots blower and is particularly suitable for suppressing the fluid noise on the suction side.
【0002】[0002]
例えば、図6および図7に示される如く、ルーツブロワ1の吸込部2に接続さ れる消音器として膨張形消音器3がある。 For example, as shown in FIGS. 6 and 7, there is an expansion silencer 3 as a silencer connected to the suction portion 2 of the roots blower 1.
【0003】 この膨張形消音器3は円管状の外筒4と、外筒4の両端部をそれぞれ閉塞状と して装着された端板5、6と、外筒4の中心に沿って下側の端板5位置より上側 の端板6を嵌通して上方突出状に装着された小径のパンチングメタル製内管7と 、外筒4と同心状で下側の端板5の外面側に固定され、かつ外筒4より小径の入 口管8と、ルーツブロワ1の吸込部2に対する接続用としての入口管8下端に備 えられた接続フランジ部9と、内管7の前記上方突出部外方を囲繞して装着され たフィルタ部10とを備えている。The expansion silencer 3 has a cylindrical outer cylinder 4, end plates 5 and 6 mounted with both ends of the outer cylinder 4 closed, and a lower end along the center of the outer cylinder 4. A small diameter punching metal inner tube 7 which is fitted in an upward projecting manner by inserting an end plate 6 above the position of the end plate 5 on the side, and an outer pipe side of the lower end plate 5 which is concentric with the outer cylinder 4. An inlet pipe 8 that is fixed and has a diameter smaller than that of the outer cylinder 4, a connection flange portion 9 provided at the lower end of the inlet pipe 8 for connecting to the suction portion 2 of the roots blower 1, and the upward protruding portion of the inner pipe 7. The filter unit 10 is mounted so as to surround the outside.
【0004】 前記フィルタ部10は、内外二重構造とされたパンチングメタル製の外フィル タ受け10aおよび内フィルタ受け10bと、両フィルタ受け10a、10b間 に装着されたフィルタ10cとから構成されている。The filter unit 10 is composed of an outer filter receiver 10a and an inner filter receiver 10b made of punching metal having an inner and outer double structure, and a filter 10c mounted between the both filter receivers 10a and 10b. There is.
【0005】 そして、フィルタ部10は、内管7の上端部に上方突出状に固定されたボルト 部11にナット12で螺合締結された押え板13と、前記上側の端板6とにより 挟持状に保持されている。The filter portion 10 is sandwiched by a holding plate 13 screwed and fastened with a nut 12 to a bolt portion 11 fixed to the upper end portion of the inner pipe 7 in a protruding manner, and the upper end plate 6. Is held in a shape.
【0006】 また、外筒4と内管7との間の空洞部には吸音材14が充填状に装着され、上 下の端板5、6間が膨張形消音部15として構成されている。Further, a sound absorbing material 14 is mounted in a space between the outer tube 4 and the inner tube 7 in a filling state, and an expansion type sound deadening part 15 is formed between the upper and lower end plates 5 and 6. .
【0007】 そして、ルーツブロワ1の作動により、空気はフィルタ部10から吸引され、 内管7、入口管8を通じてルーツブロワ1側に吸い込まれる。また、この際発生 するルーツブロワ1側の流体音等の騒音は膨張形消音器3の膨張形消音部15で 消音される。Then, by the operation of the roots blower 1, air is sucked from the filter unit 10 and is sucked into the roots blower 1 side through the inner pipe 7 and the inlet pipe 8. Further, the noise such as the fluid sound on the side of the roots blower 1 generated at this time is silenced by the expansion type silencer 15 of the expansion type silencer 3.
【0008】 例えば、この種の膨張形の消音器として実開昭60ー47892号公報に開示 の構造のものがある。For example, as an expansion type silencer of this type, there is a structure disclosed in Japanese Utility Model Laid-Open No. 60-47892.
【0009】[0009]
しかしながら、上記膨張形消音器3にあっては、膨張形消音部15の長さとし て、消音しようとする周波数の波長の1/4の長さが最低でも必要とされ、低周 波数の音を消音しようとすると消音器3全体が大形化する欠点があった。 However, in the expansion-type silencer 3, the expansion-type silencer 15 needs to have a length of at least ¼ of the wavelength of the frequency to be silenced, so that a low-frequency sound is generated. There was a drawback that the silencer 3 as a whole became large in size when it was attempted to muffle it.
【0010】 また、膨張形消音器3では、膨張形消音部15の長さによって決まる基本周波 数の奇数倍の周波数の音に消音効果があるが、それから外れた周波数の音には消 音効果がないため、種々の周波数の音が含まれている場合には、通常、複数の長 さの異なる膨張形消音部15を組み合わせることによって消音する方式が採用さ れており、この点からも膨張形消音器3の大形化を招くという欠点があった。Further, in the expansion silencer 3, the sound having a frequency that is an odd multiple of the fundamental frequency determined by the length of the expansion silencer 15 has a muffling effect, but the sound having a frequency outside the range has a muffling effect. Therefore, when sound of various frequencies is included, a method of muffling is usually adopted by combining a plurality of expansion-type muffling sections 15 having different lengths. There is a drawback that the size of the silencer 3 is increased.
【0011】 そこで、本考案は上記問題点に鑑み、特定の周波数の音を効率よく消音する消 音性能を確保しつつ、よりコンパクトな消音器を提供することを目的とする。In view of the above problems, an object of the present invention is to provide a more compact silencer while ensuring the silencing performance of efficiently silencing a sound of a specific frequency.
【0012】[0012]
上記目的を達成するための技術的手段は、音源側に接続状とされる消音器の接 続部に近い方に膨張形消音器部が備えられ、該膨張形消音器部に続いて共鳴形消 音器部が備えられてなる点にある。 The technical means for achieving the above-mentioned object is to provide an expansion silencer near a connection portion of a silencer connected to the sound source side, and to connect the expansion silencer with a resonance type silencer. The point is that the silencer section is provided.
【0013】[0013]
本考案によれば、音源からでる音のうち、低周波数の音に対しては、膨張形消 音器に比較して長さが短く構成できる共鳴形消音器部で消音し、他の周波数の音 に対しては、膨張形消音器部で消音する。 According to the present invention, of the sound emitted from the sound source, the low frequency sound is silenced by the resonance silencer that can be configured to have a shorter length than the expansion silencer, and the other frequencies With respect to sound, it is silenced by the expansion silencer.
【0014】 この際、音源に近い方に膨張形消音器部が配置され、遠い方に共鳴形消音器部 が配置されているため、音源からの音が共鳴形消音器部に入るまでに、軸方向の みに伝わる平面波に近くなり、目的とする特定の共鳴周波数の音が共鳴形消音器 部によって効率よく消音できる。At this time, since the expansion type silencer section is arranged closer to the sound source and the resonance type silencer section is arranged farther from the sound source, before the sound from the sound source enters the resonance type silencer section, It becomes close to a plane wave that propagates only in the axial direction, and the sound of a specific resonance frequency of interest can be effectively silenced by the resonance silencer.
【0015】[0015]
以下、本考案の実施例を図面に基づいて説明すると、図1に示される如く、消 音器21は、ルーツブロワ1の吸込部2に接続される接続部22と、該接続部2 2に続く消音部23と、該消音部23に続くフィルタ部24とから主構成されて いる。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a silencer 21 is connected to a suction portion 2 of a roots blower 1 and a connection portion 22 and a connection portion 22. It is mainly composed of a muffling section 23 and a filter section 24 following the muffling section 23.
【0016】 前記消音部23は、接続部22に近い側に配置された膨張形消音器部23aと 遠い側に連続的に配置された共鳴形消音器部23bとからなり、膨張形消音器部 23aは前述同様、円管状の外筒26と、外筒26の両端部をそれぞれ閉塞状と して装着された端板27、28と、外筒26の中心に沿って両端板27、28間 にわたって装着された小径のパンチングメタル製内管29と、外筒26と内管2 9との間の空洞部に充填状に装着された吸音材30とから構成されている。The muffling section 23 includes an inflatable silencer section 23 a arranged near the connecting section 22 and a resonant muffler section 23 b continuously arranged in the far side. Similarly to the above, the reference numeral 23a designates a cylindrical outer cylinder 26, end plates 27 and 28 mounted by closing both ends of the outer cylinder 26, and between both end plates 27 and 28 along the center of the outer cylinder 26. The inner pipe 29 is made of punching metal and has a small diameter, and the sound absorbing member 30 is filled in the cavity between the outer cylinder 26 and the inner pipe 29.
【0017】 また、上下の端板27、28には、内管29の内径と同一径の開口27a、2 8aがそれぞれその中心に連通状に形成されている。Further, the upper and lower end plates 27, 28 are formed with openings 27 a, 28 a having the same diameter as the inner diameter of the inner pipe 29, respectively, so as to communicate with the centers thereof.
【0018】 前記共鳴形消音器部23bは、前記外筒26の外径と同一径の円管状の外筒3 1と、外筒31の両端部をそれぞれ閉塞状として装着された端板28、32と、 外筒31の中心に沿って両端板28、32間にわたって装着されると共に前記内 管29と同一内径に形成された共鳴管33とから構成されており、共鳴管33に は適宜径の共鳴孔33aが適宜数形成されている。そして、外筒31と共鳴管3 3との間の空洞部が共鳴室34とされている。The resonance type silencer portion 23b includes a cylindrical outer cylinder 31 having the same diameter as the outer diameter of the outer cylinder 26, and an end plate 28 attached with both ends of the outer cylinder 31 closed. 32 and a resonance tube 33 which is mounted along the center of the outer cylinder 31 between the both end plates 28 and 32 and has the same inner diameter as the inner tube 29. The resonance tube 33 has an appropriate diameter. The resonance holes 33a are formed in an appropriate number. The cavity between the outer cylinder 31 and the resonance tube 33 serves as a resonance chamber 34.
【0019】 また、上側の端板32にも前述同様、共鳴管33の内径と同一径の開口32a がその中心に連通状に形成されている。Further, similarly to the above, an opening 32 a having the same diameter as the inner diameter of the resonance tube 33 is formed in the center of the upper end plate 32 so as to communicate with each other.
【0020】 前記フィルタ部24位置において、端板32上面側に、端板32の開口32a と同一内径に形成されたパンチングメタル製の尾管36が装着されており、尾管 36外方を囲繞して装着されたフィルタ部24は、前述同様、内外二重構造とさ れたパンチングメタル製の外フィルタ受け24aおよび内フィルタ受け24bと 、両フィルタ受け24a、24b間に装着されたフィルタ24cとから構成され ている。At the position of the filter portion 24, a tail pipe 36 made of punching metal and having the same inner diameter as the opening 32 a of the end plate 32 is mounted on the upper surface side of the end plate 32 and surrounds the outside of the tail pipe 36. As described above, the filter portion 24 mounted in the same manner includes an outer filter receiver 24a and an inner filter receiver 24b made of punching metal, which have an inner and outer double structure, and a filter 24c mounted between the filter receivers 24a and 24b. It consists of
【0021】 そして、フィルタ部24は、尾管36の上端部に上方突出状に固定されたボル ト部37にナット38で螺合締結された押え板39と、前記端板32とにより挟 持状に保持されている。The filter portion 24 is sandwiched by a holding plate 39 screwed and fastened with a nut 38 to a bolt portion 37 fixed to the upper end of the tail pipe 36 so as to project upward, and the end plate 32. Is held in a shape.
【0022】 前記接続部22は、前述同様、外筒26と同心状で下側の端板27の外面側に 固定され、かつ外筒26より小径の入口管41と、ルーツブロワ1の吸込部2に 対する接続用としての入口管41下端に備えられた接続フランジ部42とから構 成されている。As described above, the connecting portion 22 is concentric with the outer cylinder 26 and is fixed to the outer surface side of the lower end plate 27, and has a smaller diameter than the outer cylinder 26, and the suction portion 2 of the roots blower 1. And a connection flange portion 42 provided at the lower end of the inlet pipe 41 for connection to the.
【0023】 本考案の実施例は以上のように構成されており、消音器21をルーツブロワ1 に接続してルーツブロワ1が作動されると、空気はフィルタ部24から吸引され 、尾管36、共鳴管33、内管29、入口管41を通じてルーツブロワ1側に吸 い込まれる。The embodiment of the present invention is configured as described above. When the muffler 21 is connected to the roots blower 1 and the roots blower 1 is operated, air is sucked from the filter portion 24, the tail pipe 36, and the resonance. It is sucked to the roots blower 1 side through the pipe 33, the inner pipe 29, and the inlet pipe 41.
【0024】 この際、ルーツブロワ1側から出た流体音等の騒音は、初めに膨張形消音器部 23aに入り、この長さによって決まる基本周波数およびその奇数倍の、ルーツ ブロワ1から出る音のうち主に高周波数成分が消音される。At this time, the noise such as the fluid sound emitted from the Roots blower 1 side first enters the expansion silencer portion 23a, and the sound emitted from the Roots blower 1 of the fundamental frequency determined by this length and an odd multiple thereof. Of these, high frequency components are mainly muted.
【0025】 次に、目的とする低周波数の音に共鳴周波数が一致するように設計された共鳴 形消音器部23bに入り、低周波数成分が消音される。この場合、共鳴形消音器 部23bに到達する前に、膨張形消音器部23aを通過することで、音波がその 軸方向のみに伝わる平面波に近くなり、設計された目的とする共鳴周波数の音が 共鳴形消音器部23bによって効率よく消音される。Next, the low frequency component is silenced by entering the resonance type silencer unit 23b designed so that the resonance frequency matches the target low frequency sound. In this case, by passing through the expansion type silencer portion 23a before reaching the resonance type silencer portion 23b, the sound wave becomes close to a plane wave transmitted only in its axial direction, and the sound of the designed target resonance frequency is obtained. Is effectively silenced by the resonance type silencer portion 23b.
【0026】 以上のように、音源からでる音のうち、低周波数の音に対しては、長さが短く 構成できる共鳴形消音器部23bで消音し、高周波数の音に対しては、膨張形消 音器部23aで消音する構成としているため、膨張形消音器部23aも比較的短 く構成でき、ここに、消音性能を確保しつつ、よりコンパクトな消音器21を構 成することができる。As described above, among the sounds emitted from the sound source, low-frequency sounds are silenced by the resonance-type silencer unit 23b which can be configured to have a short length, and high-frequency sounds are expanded. Since the muffler portion 23a is configured to mute the sound, the expansion muffler portion 23a can be configured to be relatively short, and a more compact muffler 21 can be configured while ensuring the muffling performance. it can.
【0027】 また、膨脹形消音器は内管の長さが長い程、消音性能が良好となるため、膨脹 形消音器部23aに連続して共鳴形消音器部23bが接続されていることにより 、結果的に膨脹形消音器部23aの内管29が長くなったのと同じ状態となって 、膨脹形消音器部23aの消音性能も良好となる。Further, in the expansion-type silencer, the longer the length of the inner pipe, the better the sound-deadening performance. Therefore, the resonance-type silencer part 23b is connected to the expansion-type silencer part 23a continuously. As a result, the same state as when the inner tube 29 of the expansion type silencer portion 23a becomes long is obtained, and the muffling performance of the expansion type silencer portion 23a also becomes good.
【0028】 次に、具体的実施例について説明すると、図2に示される本考案の実施例にお ける消音器21の各部分の寸法を、入口管41の内径R1=60mm、外筒26 の内径R2=180mm、尾管36の内径R3=60mm、入口管41の軸方向 長さL1=80mm、膨張形消音器部23aの軸方向長さL2=250mm、共 鳴形消音器部23bの軸方向長さL3=23mm、尾管36の軸方向長さL4= 80mmとした場合、図3に示されるような挿入損失と周波数の関係のデータが 得られた。なお、図中、実線は計算値である。Explaining a concrete example, the size of each part of the silencer 21 in the example of the present invention shown in FIG. 2 is determined by the inner diameter R1 of the inlet pipe 41 = 60 mm and the outer cylinder 26. Inner diameter R2 = 180 mm, inner diameter R3 of tail pipe 36 = 60 mm, axial length L1 of inlet pipe 41 = 80 mm, axial length L2 = 250 mm of expansion silencer 23a, axis of common silencer 23b When the directional length L3 = 23 mm and the axial length L4 of the tail tube 36 = 80 mm, the data of the relationship between the insertion loss and the frequency as shown in FIG. 3 was obtained. In the figure, the solid line is the calculated value.
【0029】 また、図4に示される従来例における膨張形消音器3の各部分の寸法を、入口 管8の内径R11=80mm、外筒4の内径R12=180mm、内管7の内径 R13=60mm、入口管8の軸方向長さL11=80mm、膨張形消音器部1 5の軸方向長さL12=427mm、内管7の上方突出部の軸方向長さL13= 60mmとした場合、図5に示されるような挿入損失と周波数の関係のデータが 得られた。なお、図中、実線は計算値である。Further, the dimensions of each part of the expansion silencer 3 in the conventional example shown in FIG. 4 are as follows: inner diameter R11 of inlet pipe 8 = 80 mm, inner diameter R12 of outer cylinder 4 = 180 mm, inner diameter R13 of inner pipe 7 = 60 mm, the axial length L11 of the inlet pipe 8 = 80 mm, the axial length L12 of the expansion silencer part 15 = 427 mm, and the axial length L13 of the upward protrusion of the inner pipe 7 L60 = 60 mm. The data of the relationship between the insertion loss and the frequency as shown in 5 were obtained. In the figure, the solid line is the calculated value.
【0030】 以上のように、本具体的実施例における消音器21にあっては、設計した目的 とする共鳴周波数域(図3における周波数220Hz前後)において、大きな挿 入損失が得られており、ここに、消音器21の全長が従来の膨張形消音器3より 短くても特定の周波数の音を効率よく消音でき、消音性能が同等以上のものが得 られることがわかる。As described above, in the silencer 21 according to this specific example, a large insertion loss is obtained in the designed target resonance frequency range (around 220 Hz in FIG. 3), Here, it can be seen that even if the total length of the muffler 21 is shorter than that of the conventional expandable muffler 3, the sound of a specific frequency can be effectively muffled, and the muffling performance equal to or higher than that can be obtained.
【0031】 なお、膨張形消音器部23aや共鳴形消音器部23bの長さは、消音を希望す る周波数に応じて適宜設定すればよい。It should be noted that the lengths of the expansion silencer portion 23a and the resonance silencer portion 23b may be appropriately set according to the frequency at which silencing is desired.
【0032】[0032]
以上のように、本考案の消音器によれば、音源側に接続状とされる消音器の接 続部に近い方に膨張形消音器部が備えられ、該膨張形消音器部に続いて共鳴形消 音器部が備えられてなるものであり、低周波数の音に対しては、膨張形消音器に 比較して長さが短く構成できる共鳴形消音器部で消音でき、他の周波数の音に対 しては、膨張形消音器部で消音できるため、消音性能を確保しつつ、よりコンパ クトに製作できる。また、音源に近い方に膨張形消音器部が配置され、遠い方に 共鳴形消音器部が配置されているため、音源からの音が共鳴形消音器部に入るま でに、軸方向のみに伝わる平面波に近くなり、目的とする共鳴周波数の音が共鳴 形消音器部によって効率よく消音できる利点がある。 As described above, according to the silencer of the present invention, the expansion silencer is provided near the connection part of the silencer connected to the sound source side, and the expansion silencer is connected to the expansion silencer. It is equipped with a resonance-type silencer.For low frequency sounds, the resonance-type silencer, which has a shorter length than the expansion-type silencer, can be used to muffle other frequencies. The expansion muffler can muffle the sound of the sound, so it can be manufactured more compactly while ensuring the muffling performance. Also, since the expansion silencer is located closer to the sound source and the resonance silencer is located farther away, the sound from the sound source enters the resonance silencer only in the axial direction. It has the advantage that it becomes close to the plane wave that is transmitted to, and the sound of the target resonance frequency can be effectively silenced by the resonance silencer section.
【図1】本考案の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
【図2】本考案の具体的実施例における説明図である。FIG. 2 is an explanatory diagram of a specific embodiment of the present invention.
【図3】同具体的実施例における周波数と挿入損失の関
係図である。FIG. 3 is a relationship diagram between frequency and insertion loss in the same specific example.
【図4】従来例の具体的実施例における説明図である。FIG. 4 is an explanatory diagram of a specific example of a conventional example.
【図5】同具体的実施例における周波数と挿入損失の関
係図である。FIG. 5 is a relationship diagram between frequency and insertion loss in the same specific example.
【図6】ルーツブロワと膨張形消音器との連結状態を示
す説明図である。FIG. 6 is an explanatory view showing a connected state of a roots blower and an expansion silencer.
【図7】従来例を示す断面図である。FIG. 7 is a cross-sectional view showing a conventional example.
1 ルーツブロワ 2 吸込部 21 消音器 22 接続部 23 消音部 23a 膨張形消音器部 23b 共鳴形消音器部 24 フィルタ部 24a 外フィルタ受け 24b 内フィルタ受け 24c フィルタ 26 外筒 27 端板 28 端板 29 内管 30 吸音材 31 外筒 32 端板 33 共鳴管 33a 共鳴孔 34 共鳴室 36 尾管 39 押え板 41 入口管 42 接続フランジ部 1 Roots blower 2 Suction part 21 Silencer 22 Connection part 23 Silencing part 23a Expansion type silencer part 23b Resonance type silencer part 24 Filter part 24a Outer filter receiver 24b Inner filter receiver 24c Filter 26 Outer cylinder 27 End plate 28 End plate 29 Inside Tube 30 Sound absorbing material 31 Outer cylinder 32 End plate 33 Resonance tube 33a Resonance hole 34 Resonance chamber 36 Tail tube 39 Holding plate 41 Inlet tube 42 Connection flange part
Claims (1)
に近い方に膨張形消音器部が備えられ、該膨張形消音器
部に続いて共鳴形消音器部が備えられてなることを特徴
とする消音器。1. An expansion type silencer portion is provided near a connection portion of a silencer connected to a sound source side, and a resonance silencer portion is provided following the expansion type silencer portion. A muffler characterized by that.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5603293U JP2586485Y2 (en) | 1993-09-21 | 1993-09-21 | Silencer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5603293U JP2586485Y2 (en) | 1993-09-21 | 1993-09-21 | Silencer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0722009U true JPH0722009U (en) | 1995-04-21 |
JP2586485Y2 JP2586485Y2 (en) | 1998-12-09 |
Family
ID=13015742
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5603293U Expired - Lifetime JP2586485Y2 (en) | 1993-09-21 | 1993-09-21 | Silencer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2586485Y2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003020180A (en) * | 2001-07-10 | 2003-01-21 | Toshiba Elevator Co Ltd | Elevator sound insulating device |
JP2003040557A (en) * | 2001-07-24 | 2003-02-13 | Toshiba Elevator Co Ltd | Muffling device for elevator |
-
1993
- 1993-09-21 JP JP5603293U patent/JP2586485Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2586485Y2 (en) | 1998-12-09 |
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