JP2011030867A - Silencer and vacuum cleaner - Google Patents

Silencer and vacuum cleaner Download PDF

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JP2011030867A
JP2011030867A JP2009181284A JP2009181284A JP2011030867A JP 2011030867 A JP2011030867 A JP 2011030867A JP 2009181284 A JP2009181284 A JP 2009181284A JP 2009181284 A JP2009181284 A JP 2009181284A JP 2011030867 A JP2011030867 A JP 2011030867A
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inner tube
absorbing material
sound absorbing
silencer
rib
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JP5395560B2 (en
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Nobuyuki Iwata
宜之 岩田
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Toshiba Corp
Toshiba Lifestyle Products and Services Corp
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Toshiba Corp
Toshiba Consumer Electronics Holdings Corp
Toshiba Home Appliances Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a silencer capable of obtaining a sufficient sound absorbing effect without being enlarged more than needed. <P>SOLUTION: Grid-like rib portions 42b are formed in a cylindrical inner tube 42. Between the rib portions 42b, a hole portion 42a for making the outer side and inner side of the inner tube 42 communicate with each other is formed. When a sound absorbing material 43 is wound on the outer surface side of the inner tube 42, the sound absorbing material 43 is held by the inner tube 42 without generating wrinkles or the like on the inner surface side of the sound absorbing material 43, and also the inner peripheral side of the sound absorbing material 43 is exposed to the inner side of the inner tube 42 through the hole portion 42a. Without enlarging the whole structure more than needed, suction air W is directly applied to the sound absorbing material 43 and a sufficient sound absorbing effect is obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、吸音材を内部に有する消音器およびこれを備えた電気掃除機に関する。   The present invention relates to a silencer having a sound absorbing material therein and a vacuum cleaner including the silencer.

従来、例えば電気掃除機において、電動送風機の駆動音(遠心ファンの回転音)、および、電動送風機の駆動に伴い発生する吸気風による風切り音などを消音するために膨張型の消音器が用いられることがある。このような消音器は、吸込口体としての床ブラシと延長管との間に接続される円筒状の外管の軸方向の中心域に、外管の両端部よりも拡径された径大部が形成されており、この径大部内に例えば発泡性の合成樹脂などにより形成した円筒状の吸音材が配置されて構成されている。そして、この吸音材の内側は、吸気風が通過する風路となるため、この吸気風に含まれる塵埃により吸音材が目詰まりしないように、吸音材の内周面に沿って円筒状に形成した不織布が配置されている(例えば、特許文献１参照。)。   Conventionally, in a vacuum cleaner, for example, an expansion silencer is used to mute the driving sound of an electric blower (rotating sound of a centrifugal fan) and the wind noise caused by the intake air generated by driving the electric blower. Sometimes. Such a silencer has a larger diameter than the both ends of the outer tube in the axial central region of the cylindrical outer tube connected between the floor brush as the suction port and the extension tube. A cylindrical sound-absorbing material formed of, for example, foamable synthetic resin is disposed in the large-diameter portion. Since the inside of the sound absorbing material is an air passage through which the intake air passes, it is formed in a cylindrical shape along the inner peripheral surface of the sound absorbing material so that the sound absorbing material is not clogged by dust contained in the intake air. A non-woven fabric is disposed (see, for example, Patent Document 1).

特許第２６５６６６１号公報(第４−６頁、第１図)Japanese Patent No. 2656661 (page 4-6, Fig. 1)

しかしながら、上述の消音器では、吸音材の内側が不織布によって覆われているため、吸音材の吸音効果が充分でないので、結果的に吸音材を大きくしなければならず、小型化が容易でないという問題点を有している。   However, in the above-mentioned silencer, since the inside of the sound absorbing material is covered with the nonwoven fabric, the sound absorbing effect of the sound absorbing material is not sufficient. As a result, the sound absorbing material must be enlarged, and it is difficult to reduce the size. Has a problem.

また、吸音材は厚みを厚くした方が、より吸音効果を得ることができるものの、厚みが大きいシート状の吸音材を円筒状に巻くと、吸音材の内周面などに皺が生じ、この内周面に段差が形成されて吸音効果が低下するだけでなく、その段差で風切り音が発生するおそれがある。   Further, although the sound absorbing material can obtain a sound absorbing effect more when the thickness is increased, if the sheet-shaped sound absorbing material having a large thickness is wound in a cylindrical shape, wrinkles are generated on the inner peripheral surface of the sound absorbing material, and the like. A step is formed on the inner peripheral surface to reduce the sound absorption effect, and wind noise may occur at the step.

本発明は、このような点に鑑みなされたもので、必要以上に大型化することなく充分な吸音効果を得ることができる消音器およびこれを備えた電気掃除機を提供することを目的とする。   This invention is made | formed in view of such a point, and it aims at providing the silencer which can acquire sufficient sound absorption effect, without enlarging more than necessary, and a vacuum cleaner provided with the same. .

本発明は、筒状の外管との内方に配置された筒状の内管と、この内管の外面側に巻き付けられてこの内管の外面と外管との間に位置し通気性を有する軟質の吸音材とを具備し、内管が、格子状に形成されたリブ部と、このリブ部の間に位置し内管の外側と内側とを連通する孔部とを備えているものである。   The present invention relates to a cylindrical inner tube disposed inward of a cylindrical outer tube, and is wound around the outer surface side of the inner tube and located between the outer surface of the inner tube and the outer tube. The inner tube includes a rib portion formed in a lattice shape and a hole portion that is located between the rib portions and communicates the outside and the inside of the inner tube. Is.

本発明によれば、筒状の内管に格子状にリブ部を形成し、このリブ部の間に、内管の外側と内側とを連通する孔部を形成することにより、内管の外面側に吸音材を巻き付けると、吸音材の内面側に皺などを発生させることなく内管によって吸音材を保持でき、かつ、この吸音材の内面側が孔部を介して内管の内側に露出するので、全体を必要以上に大型化することなく、内管内の空気を吸音材に直接当てることができ、充分な吸音効果を得ることができる。   According to the present invention, a rib portion is formed in a lattice shape on a cylindrical inner tube, and an outer surface of the inner tube is formed between the rib portions so as to communicate the outside and the inside of the inner tube. When the sound absorbing material is wound on the side, the sound absorbing material can be held by the inner tube without generating flaws on the inner surface side of the sound absorbing material, and the inner surface side of the sound absorbing material is exposed to the inside of the inner tube through the hole. Therefore, the air in the inner pipe can be directly applied to the sound absorbing material without making the whole larger than necessary, and a sufficient sound absorbing effect can be obtained.

本発明の一実施の形態の消音器を備えた電気掃除機の一部を示す縦断面図である。It is a longitudinal cross-sectional view which shows a part of vacuum cleaner provided with the silencer of one embodiment of this invention. 同上内管に吸音材を巻き付けた状態を示す正面図である。It is a front view which shows the state which wound the sound absorption material around the inner pipe same as the above. 同上消音器の内管の斜視図である。It is a perspective view of the inner pipe of a silencer same as the above. 同上電気掃除機の斜視図である。It is a perspective view of a vacuum cleaner same as the above. 同上電気掃除機と消音器を備えない従来例の電気掃除機とのパワースペクトルの一部を示すグラフである。It is a graph which shows a part of power spectrum with a vacuum cleaner of a prior art example which is not equipped with a vacuum cleaner and a silencer same as the above.

以下、本発明の一実施の形態の構成を図１ないし図４を参照して説明する。   Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIGS.

図４において、11はいわゆるキャニスタ型の電気掃除機を示し、この電気掃除機11は、掃除機本体12と、この掃除機本体12に着脱可能に接続される吸込部としての管部13とを有している。   In FIG. 4, reference numeral 11 denotes a so-called canister-type vacuum cleaner. The vacuum cleaner 11 includes a vacuum cleaner body 12 and a pipe portion 13 as a suction portion that is detachably connected to the vacuum cleaner body 12. Have.

掃除機本体12は、床面上を旋回および走行可能な中空状の本体ケース15を備えており、この本体ケース15の内部に、図示しない本体集塵室と電動送風機室とが前後に区画されている。さらに、電動送風機室には、電動送風機17が収容されており、この電動送風機17の吸込側が本体集塵室に連通している。また、本体集塵室内には、フィルタ、集塵袋、あるいは集塵装置(集塵カップ)などの集塵部18が配置されている。そして、本体ケース15の前側には、本体集塵室に連通するとともに管部13の基端側が接続される本体吸込口19が開口形成されている。さらに、本体ケース15の内部には、電動送風機17の動作を制御する図示しない制御手段が配置されている。なお、この掃除機本体12は、図示しない電源コードを介して商用交流電源から給電する構成でもよいし、例えば二次電池などの電源を内蔵して、その電源から給電する構成でもよい。   The vacuum cleaner main body 12 includes a hollow main body case 15 that can swivel and travel on the floor surface, and a main body dust collection chamber and an electric blower chamber (not shown) are partitioned in the front and rear in the main body case 15. ing. Furthermore, an electric blower 17 is accommodated in the electric blower chamber, and the suction side of the electric blower 17 communicates with the main body dust collection chamber. Further, a dust collection unit 18 such as a filter, a dust collection bag, or a dust collection device (dust collection cup) is arranged in the main body dust collection chamber. A main body suction port 19 is formed in the front side of the main body case 15 so as to communicate with the main body dust collection chamber and to which the proximal end side of the pipe portion 13 is connected. Further, a control means (not shown) for controlling the operation of the electric blower 17 is disposed inside the main body case 15. The cleaner main body 12 may be configured to supply power from a commercial AC power source via a power cord (not shown), or may be configured to include a power source such as a secondary battery and to be supplied from the power source.

また、管部13は、本体吸込口19に接続される接続管部21と、この接続管部21の先端側に連通する可撓性を有するホース体22と、このホース体22の先端側に設けられた操作部としての握り管部である手元操作部23と、この手元操作部23の先端側に着脱可能に接続される延長管24とを備えており、この延長管24の先端側に、吸込口体である床ブラシ25が着脱可能となっている。   Further, the pipe part 13 includes a connecting pipe part 21 connected to the main body suction port 19, a flexible hose body 22 communicating with the distal end side of the connecting pipe part 21, and a distal end side of the hose body 22. It is provided with a hand operating part 23 which is a grip tube part provided as an operating part, and an extension tube 24 detachably connected to the distal end side of the hand operating part 23. The floor brush 25, which is a suction port body, is detachable.

手元操作部23は、床ブラシ25などを床面上で操作するためのものであり、図１に示すように、一端側である上流端側(前端側)に延長管24の下流端側(基端側)を着脱可能な略円筒状の手元操作部本体としての上流側手元操作部である筒部31と、この筒部31の他端側である下流端側(後端側)に一端側である上流端側(前端側)側が接続され他端側である下流端側(後端側)にホース体22の上流端側(先端側)が接続される略円筒状の消音器32と、この消音器32の下流端側を覆って取り付けられた略円筒状のカバー部33とを一体的に備えており、筒部31および消音器32に亘って、延長管24側とホース体22側(掃除機本体12(図４)側)とを連通する風路としての連通風路35が形成されている。   The hand operating section 23 is for operating the floor brush 25 and the like on the floor surface, and as shown in FIG. 1, the upstream end side (front end side) which is one end side is connected to the downstream end side ( (Base end side) is a cylindrical portion 31 that is an upstream hand operating portion as a substantially cylindrical hand operating portion body that can be attached and detached, and one end on the downstream end (rear end side) that is the other end side of the tube portion 31 A substantially cylindrical silencer 32 connected to the upstream end side (front end side) of the hose body 22 and connected to the downstream end side (rear end side) which is the other end side of the upstream end side (front end side) side The muffler 32 is integrally provided with a substantially cylindrical cover portion 33 that covers the downstream end side of the silencer 32. The extension tube 24 side and the hose body 22 extend across the cylinder portion 31 and the silencer 32. A communication air passage 35 is formed as an air passage communicating with the side (the vacuum cleaner body 12 (FIG. 4) side).

連通風路35の上流端となる筒部31は、硬質の合成樹脂などにより形成されており、下流端側の上部に、作業者によって把持される把持部37が後方に向けて湾曲状に突設されている。この把持部37には、図４に示すように、電動送風機17の動作モードを制御手段に設定するための設定ボタン38が配置されている。   The cylindrical portion 31 that is the upstream end of the communication air passage 35 is formed of a hard synthetic resin or the like, and a grip portion 37 that is gripped by an operator protrudes in a curved shape toward the rear at the upper portion on the downstream end side. It is installed. As shown in FIG. 4, a setting button 38 for setting the operation mode of the electric blower 17 to the control means is disposed on the grip portion 37.

図１に戻って、消音器32は、略円筒状の外管41と、略円筒状の内管42と、これら外管41と内管42との間に配置された吸音材43とを有する、いわゆる膨張型の消音器である。   Returning to FIG. 1, the silencer 32 includes a substantially cylindrical outer tube 41, a substantially cylindrical inner tube 42, and a sound absorbing material 43 disposed between the outer tube 41 and the inner tube 42. It is a so-called expansion type silencer.

外管41は、この外管41の上流側(前端側)部分ないし中間部分を構成する外管上流部45と、この外管41の中間部分ないし下流側(後端側)部分を構成する外管下流部46とを一体的に備えている。   The outer pipe 41 includes an outer pipe upstream portion 45 constituting an upstream (front end side) portion or intermediate portion of the outer tube 41 and an outer portion constituting an intermediate portion or downstream (rear end side) portion of the outer tube 41. A pipe downstream portion 46 is integrally provided.

外管上流部45は、筒部31の下流端側(後端側)に挿入接続されている略円筒状の上流側接続部48と、この上流側接続部48の下流端側(後端側)に連続しこの上流側接続部48よりも径寸法が大きい上流側膨張部である上流側拡大部49とを一体に備えている。   The outer pipe upstream portion 45 includes a substantially cylindrical upstream connection portion 48 inserted and connected to the downstream end side (rear end side) of the cylindrical portion 31, and a downstream end side (rear end side) of the upstream connection portion 48. ) And an upstream expansion portion 49 that is an upstream expansion portion that is larger in diameter than the upstream connection portion 48 and is integrally provided.

上流側接続部48は、上流端側(前端側)の内周面が、筒部31の内周面に対して滑らかに連続して下流側(後側)へと中心軸側に徐々に傾斜する、すなわち縮径する上流側導風面である縮径面48aとなっている。したがって、この上流側接続部48は、電動送風機17(図４)の駆動により管部13内に吸い込まれた吸気風Ｗの流速を下流側へと早めるように構成されている。また、この上流側接続部48は、下流端側(後端側)の内周面が、下流側(後側)へと急峻に拡径(拡開)された拡径(拡開)導風面である拡径面48bとなっている。したがって、この上流側接続部48は、下流側が段差状に拡開されている。さらに、この上流側接続部48の外周面には、この上流側接続部48(消音器32)が筒部31の内周面に対して気密に接続されるように、図示しないシール部材が取り付けられている。そして、この上流側接続部48は、筒部31に対して、中心軸を中心として周方向に回転可能に接続されており、この回転により筒部31との間で空気漏れが生じないようにシール部材を介して外面(外周面)が筒部31側と密着している。   In the upstream connection portion 48, the inner peripheral surface on the upstream end side (front end side) smoothly and continuously inclines toward the central axis side toward the downstream side (rear side) with respect to the inner peripheral surface of the cylindrical portion 31. In other words, the diameter-reducing surface 48a is an upstream air guide surface that is reduced in diameter. Therefore, the upstream side connection portion 48 is configured to accelerate the flow velocity of the intake air W sucked into the pipe portion 13 by driving the electric blower 17 (FIG. 4) to the downstream side. Further, the upstream connection portion 48 has a radially expanded (expanded) wind guide whose inner peripheral surface on the downstream end side (rear end side) is sharply expanded (expanded) toward the downstream side (rear side). The surface is an enlarged-diameter surface 48b. Therefore, the upstream side connection portion 48 is widened in a step shape on the downstream side. Further, a seal member (not shown) is attached to the outer peripheral surface of the upstream connection portion 48 so that the upstream connection portion 48 (the silencer 32) is airtightly connected to the inner peripheral surface of the cylindrical portion 31. It has been. The upstream connection portion 48 is connected to the cylindrical portion 31 so as to be rotatable in the circumferential direction about the central axis so that no air leakage occurs between the upstream connecting portion 48 and the cylindrical portion 31 due to this rotation. The outer surface (outer peripheral surface) is in close contact with the cylindrical portion 31 side through the seal member.

上流側拡大部49は、上流側接続部48と略同軸の略円筒状に形成されており、下流端側が開放されている。   The upstream side enlarged portion 49 is formed in a substantially cylindrical shape that is substantially coaxial with the upstream side connecting portion 48, and the downstream end side is open.

一方、外管下流部46は、外管上流部45の上流側拡大部49が同軸状に気密に挿入接続される下流側拡大部51と、この下流側拡大部51の下流端側に連続しこの下流側拡大部51よりも径寸法が小さい下流側接続部52とを一体に備えている。   On the other hand, the outer pipe downstream part 46 is continuous with the downstream side enlarged part 51 into which the upstream side enlarged part 49 of the outer pipe upstream part 45 is coaxially inserted and connected, and the downstream end side of the downstream side enlarged part 51. A downstream connection portion 52 having a smaller diameter than the downstream enlarged portion 51 is integrally provided.

下流側拡大部51は、下流側接続部52と略同軸の略円筒状に形成されており、上流端側が開放されている。そして、この下流側拡大部51は、上流側拡大部49とともに、上流側接続部48と下流側接続部52との間に位置する消音部としての拡大部54を構成している。なお、本実施の形態では、下流側拡大部51内に上流側拡大部49を気密に挿入接続した構成となっているが、上流側拡大部49内に下流側拡大部51を気密に挿入接続する構成などでもよい。   The downstream enlarged portion 51 is formed in a substantially cylindrical shape that is substantially coaxial with the downstream connection portion 52, and the upstream end side is open. The downstream side enlarged portion 51 and the upstream side enlarged portion 49 constitute an enlarged portion 54 as a silencer located between the upstream side connected portion 48 and the downstream side connected portion 52. In this embodiment, the upstream enlarged portion 49 is inserted and connected in an airtight manner in the downstream enlarged portion 51. However, the downstream enlarged portion 51 is inserted and connected in an airtight manner in the upstream enlarged portion 49. The structure etc. to perform may be sufficient.

拡大部54は、上流側接続部48および下流側接続部52と略同軸に形成されており、把持部37の下方のデッドスペース内に位置している。また、この拡大部54の内部には、内管42および吸音材43が配置される空間部である膨張室54aが区画されている。   The enlarged portion 54 is formed substantially coaxially with the upstream connection portion 48 and the downstream connection portion 52, and is located in a dead space below the grip portion 37. In addition, an expansion chamber 54a, which is a space in which the inner tube 42 and the sound absorbing material 43 are disposed, is defined inside the enlarged portion 54.

ここで、拡大部54は、上流端の径寸法(上流側接続部48の縮径面48aの最小径寸法)と拡径された最大径寸法との比率により、騒音の減衰率が設定されているとともに、軸方向の長さ寸法によって、騒音中の消音したいターゲットとなる周波数帯域が設定されている。本実施の形態では、例えば電動送風機17の駆動に伴い発生する騒音(いわゆるＮＺ音)、あるいは、集塵部18(図４)がサイクロン式の集塵装置である場合のサイクロン分離に伴い発生する乱流音などの騒音を主として消音するものであって、かつ、拡大部54の長さ寸法が、把持部37の後方への突出寸法よりも短く、この把持部37と干渉しない程度の長さとなるように拡大部54を設計することが好ましい。   Here, the expansion portion 54 has a noise attenuation rate set by the ratio of the upstream end diameter dimension (the minimum diameter dimension of the reduced diameter surface 48a of the upstream connection section 48) and the expanded maximum diameter dimension. In addition, a frequency band that is a target to be silenced in noise is set according to the length in the axial direction. In the present embodiment, for example, noise (so-called NZ sound) generated when the electric blower 17 is driven, or generated due to cyclone separation when the dust collection unit 18 (FIG. 4) is a cyclone type dust collector. It is intended to mute noises such as turbulent sound, and the length of the enlarged portion 54 is shorter than the rearward projecting size of the gripping portion 37, so that it does not interfere with the gripping portion 37. It is preferable to design the enlarged portion 54 so that

また、下流側接続部52は、上流端側(前端側)の内周面が、下流側(後側)へと急峻に縮径された縮径導風面である下流側傾斜面52aとなっている。したがって、この下流側接続部52は、上流側が段差状に縮径されている。また、この下流側接続部52は、下流側傾斜面52aの下流側の位置から下流端側(前端側)へと、内周面が徐々に拡径されている。さらに、この下流側接続部52は、ホース体22に対して気密に挿入接続されている。   Further, the downstream connection portion 52 has an inner peripheral surface on the upstream end side (front end side) as a downstream inclined surface 52a that is a reduced-diameter air guide surface whose diameter is sharply reduced toward the downstream side (rear side). ing. Accordingly, the downstream side connection portion 52 is reduced in diameter in a stepped shape on the upstream side. Further, the diameter of the inner peripheral surface of the downstream connection portion 52 is gradually increased from the position on the downstream side of the downstream inclined surface 52a to the downstream end side (front end side). Further, the downstream connection portion 52 is inserted and connected to the hose body 22 in an airtight manner.

また、内管42は、図１ないし図３に示すように、硬質の合成樹脂などにより直管状に形成されており、一端側である上流端側(前端側)が外管41の拡径面48bに接続され、他端側である下流端側(後端側)が外管41の下流側傾斜面52aに接続されて、内部が連通風路35の一部を構成している。さらに、この内管42には、周面に、軸方向に対して平行で、かつ、周方向に、複数の四角形状の孔部42aがそれぞれ形成されている。すなわち、これら孔部42aは、内管42の周面に、軸方向および周方向に略等間隔に離間されて配置されている。このため、内管42の周面には、これら孔部42a間に格子状のリブ部42bが形成されている。   Further, as shown in FIGS. 1 to 3, the inner tube 42 is formed in a straight tube shape with a hard synthetic resin or the like, and an upstream end side (front end side) which is one end side is a diameter expansion surface of the outer tube 41. The downstream end side (rear end side), which is the other end side, is connected to the downstream inclined surface 52a of the outer pipe 41, and the inside forms a part of the communication air passage 35. Further, the inner tube 42 is formed with a plurality of square holes 42a on the circumferential surface in parallel to the axial direction and in the circumferential direction. That is, these hole portions 42a are arranged on the circumferential surface of the inner tube 42 so as to be spaced apart at substantially equal intervals in the axial direction and the circumferential direction. Therefore, a lattice-like rib portion 42b is formed between the hole portions 42a on the peripheral surface of the inner tube 42.

孔部42aは、例えば周方向に長孔状に形成されている。   The hole 42a is formed in a long hole shape in the circumferential direction, for example.

リブ部42bは、内管42の軸方向に沿って直線状、すなわち内管42の軸方向に沿う成分を有する複数の軸方向リブ42cと、これら軸方向リブ42cと交差する成分を有する、すなわち内管42の周方向に沿う複数の交差方向リブとしての周方向リブ42dとを有している。   The rib portion 42b is linear along the axial direction of the inner tube 42, that is, has a plurality of axial ribs 42c having a component along the axial direction of the inner tube 42, and a component intersecting with these axial ribs 42c, It has a circumferential rib 42d as a plurality of intersecting ribs along the circumferential direction of the inner tube 42.

軸方向リブ42cは、全てが略等しい幅寸法に形成されている。   All of the axial ribs 42c are formed to have substantially the same width.

また、周方向リブ42dは、内管42の軸方向の両端部に位置する周方向リブ42da，42daが、これら周方向リブ42da，42da間に位置する、すなわち、内管42の軸方向の両端部を除く位置に位置する周方向リブ42dbよりも軸方向に幅広に形成されている。なお、各周方向リブ42daは、例えば各周方向リブ42dbの倍以上の幅寸法で、かつ、軸方向リブ42cよりも幅広に形成されており、各周方向リブ42dbは、例えば軸方向リブ42cよりも幅狭に形成されており、これら周方向リブ42dbのそれぞれは略等しい幅寸法に形成されている。   Further, in the circumferential rib 42d, the circumferential ribs 42da and 42da located at both axial ends of the inner tube 42 are located between the circumferential ribs 42da and 42da, that is, both axial ends of the inner tube 42 It is formed wider in the axial direction than the circumferential rib 42db located at a position excluding the portion. Each circumferential rib 42da is, for example, wider than each circumferential rib 42db and wider than the axial rib 42c, and each circumferential rib 42db is, for example, the axial rib 42c. The circumferential ribs 42db are each formed to have substantially the same width dimension.

そして、吸音材43は、空気の振動エネルギーである音を熱エネルギーなどに変換することで拡大部54での吸音性をさらに高めるものであり、例えば発泡性ウレタン、あるいは不織布などにより四角形シート状に形成されており、図２に示すように、内管42の外面側に多重に巻き付けられている。したがって、吸音材43には、多重部分の間に、僅かな空気層56が形成されている。なお、図２において、空気層56は誇張して示されており、実際には吸音材43の厚みに対して遥かに小さく形成されている。   The sound absorbing material 43 further enhances the sound absorbing property in the enlarged portion 54 by converting sound, which is vibration energy of air, into heat energy, for example, in the form of a square sheet by foaming urethane, nonwoven fabric, or the like. As shown in FIG. 2, it is wound around the outer surface side of the inner tube 42 in a multiple manner. Therefore, a slight air layer 56 is formed in the sound absorbing material 43 between the multiple portions. In FIG. 2, the air layer 56 is exaggerated, and is actually formed much smaller than the thickness of the sound absorbing material 43.

ここで、吸音材43の両端部43a，43aは、それぞれ内管42の軸方向の両端部に位置する周方向リブ42da，42daに重なるように配置されている。また、吸音材43の巻き始めの端部43bは、例えば上側に位置する軸方向リブ42c(図３)に沿って配置されている。したがって、吸音材の両端部43a，43aおよび巻き始めの端部43bは、それぞれ孔部42aに臨まない位置に配置されている。さらに、吸音材43の巻き終わりの端部43cは、巻き始めの端部43bに対応する位置に配置されている。このため、本実施の形態では、内管42の外面に対して、吸音材43が最大で２重に巻き付けられている。   Here, both end portions 43a, 43a of the sound absorbing material 43 are arranged so as to overlap with circumferential ribs 42da, 42da located at both end portions in the axial direction of the inner tube 42, respectively. Further, the winding start end portion 43b of the sound absorbing material 43 is disposed, for example, along the axial rib 42c (FIG. 3) located on the upper side. Therefore, the both end portions 43a and 43a and the winding start end portion 43b of the sound absorbing material are respectively arranged at positions that do not face the hole portion 42a. Furthermore, the winding end portion 43c of the sound absorbing material 43 is arranged at a position corresponding to the winding start end portion 43b. For this reason, in the present embodiment, the sound absorbing material 43 is wound around the outer surface of the inner tube 42 twice at the maximum.

なお、吸音材43を多重に巻き付けているとは、例えば互いに異なる径寸法を有する円筒状に形成した吸音材43を同心状(同軸状)に多重構造として内管42の外面側に配置した状態なども含むものとする。   The sound-absorbing material 43 is wound in multiple states, for example, a state where the sound-absorbing material 43 formed in a cylindrical shape having different diameters is disposed concentrically (coaxially) on the outer surface side of the inner tube 42 as a multiple structure. Etc.

また、図１に示すように、カバー部33は、比較的軟質の合成樹脂などにより形成されており、消音器32の外管41の下流側接続部52の外周面に、中心軸を中心として周方向に回転可能に接続されている。   Further, as shown in FIG. 1, the cover portion 33 is formed of a relatively soft synthetic resin or the like, and the outer peripheral surface of the downstream connection portion 52 of the outer tube 41 of the silencer 32 is centered on the central axis. It is connected so as to be rotatable in the circumferential direction.

次に、上記一実施の形態の作用を説明する。   Next, the operation of the above embodiment will be described.

図４に示すように、電動送風機17などに給電可能とした状態で、作業者は把持部37を把持し、所望の設定ボタン38を操作して設定した所望の動作モードで電動送風機17を動作させる。   As shown in FIG. 4, the operator operates the electric blower 17 in a desired operation mode set by operating the desired setting button 38 while holding the gripping portion 37 in a state where electric power can be supplied to the electric blower 17 and the like. Let

そして、床面上で床ブラシ25を前後に走行させ、電動送風機17の駆動により発生させた負圧によって、床ブラシ25の先端側の吸込口から床面上の塵埃を空気とともに吸い込む。   Then, the floor brush 25 is moved forward and backward on the floor surface, and the dust on the floor surface is sucked together with air from the suction port on the front end side of the floor brush 25 by the negative pressure generated by driving the electric blower 17.

この吸い込まれた空気は吸気風Ｗ(図１)となり、塵埃とともに床ブラシ25から延長管24を介して手元操作部23へと流入する。   The sucked air becomes the intake air W (FIG. 1), and flows into the hand operating unit 23 from the floor brush 25 through the extension pipe 24 together with dust.

ここで、図１に示すように、吸気風Ｗは、消音器32の上流側接続部48の縮径面48aにより流速を早められつつ拡径面48bから拡大部54内へと流入して膨張され、各孔部42aから吸音材43内へと流入した後、この吸音材43を通過する。このように、吸気風Ｗは拡大部54で膨張されるとともに吸音材43を通過することにより消音される。また、吸気風Ｗに含まれる塵埃は、その重量により消音器32の内部の連通風路35を略直進して通過する。   Here, as shown in FIG. 1, the intake air W flows from the enlarged diameter surface 48 b into the enlarged portion 54 while being accelerated by the reduced diameter surface 48 a of the upstream connection portion 48 of the silencer 32 and expands. After flowing into the sound absorbing material 43 from each hole 42a, the sound absorbing material 43 is passed through. In this way, the intake air W is expanded by the enlarged portion 54 and is silenced by passing through the sound absorbing material 43. Further, the dust contained in the intake air W passes through the communication air passage 35 inside the silencer 32 substantially straight due to its weight.

そして、吸気風Ｗは、下流側傾斜面52aを介して下流側接続部52へと流入し、さらに、ホース体22へと通過する。   Then, the intake air W flows into the downstream connection portion 52 through the downstream inclined surface 52a and further passes to the hose body 22.

この後、吸気風Ｗは、図４に示すホース体22から本体吸込口19を介して掃除機本体12の集塵部18へと流入し、この集塵部18で塵埃が捕集される。このとき、集塵部18での集塵により発生した乱流音は、図１に示す消音器32内へと下流側から流入し、下流側傾斜面52aから拡大部54内へと流入して膨張され、各孔部42aから吸音材43内へと流入した後、この吸音材43を通過することにより消音される。   Thereafter, the intake air W flows from the hose body 22 shown in FIG. 4 into the dust collecting part 18 of the cleaner body 12 through the main body suction port 19, and dust is collected by the dust collecting part 18. At this time, the turbulent sound generated by the dust collection at the dust collection unit 18 flows into the silencer 32 shown in FIG. 1 from the downstream side, and flows into the expansion unit 54 from the downstream inclined surface 52a. After being expanded and flowing into the sound absorbing material 43 from each hole 42a, the sound is silenced by passing through the sound absorbing material 43.

そして、吸気風Ｗ(図１)は、電動送風機17に流入し、この電動送風機17を冷却しつつこの電動送風機17を通過して排気されることで排気風となり、本体ケース15の排気孔から、この本体ケース15の外部へと排気される。   Then, the intake air W (FIG. 1) flows into the electric blower 17 and is exhausted by passing through the electric blower 17 while cooling the electric blower 17 to be exhausted from the exhaust hole of the main body case 15. The air is exhausted to the outside of the main body case 15.

上述したように、上記一実施の形態によれば、円筒状の内管42に格子状にリブ部42bを形成し、このリブ部42b間に内管42の外側と内側とを連通する孔部42aを形成することにより、内管42の外面側に吸音材43を巻き付けると、吸音材43の内面側に皺などを発生させて連通風路35の断面を乱すことなく内管42によって吸音材43を保持でき、かつ、この吸音材43の内面側が孔部42aを介して内管42の内側に露出するので、例えば拡大部54の径寸法(消音器32の外形)を必要以上に大きくするなど全体を大型化することなくことなく、吸気風Ｗを吸音材43に直接当てることができ、充分な吸音効果を得ることができる。   As described above, according to the above-described embodiment, the rib portion 42b is formed in a lattice shape in the cylindrical inner tube 42, and the hole portion that communicates the outside and the inside of the inner tube 42 between the rib portions 42b. When the sound absorbing material 43 is wound around the outer surface side of the inner tube 42 by forming 42a, the sound absorbing material is generated by the inner tube 42 without disturbing the cross section of the communication air passage 35 by generating soot on the inner surface side of the sound absorbing material 43. 43, and the inner surface side of the sound absorbing material 43 is exposed to the inside of the inner tube 42 through the hole 42a. For example, the diameter of the enlarged portion 54 (the outer shape of the silencer 32) is increased more than necessary. Without increasing the overall size, the intake air W can be directly applied to the sound absorbing material 43, and a sufficient sound absorbing effect can be obtained.

具体的に、図５のグラフに示すように、上記消音器32を備える電気掃除機11(実線)では、消音器を備えない従来例の電気掃除機(１点鎖線)と比較して、特に１ｋＨｚ以下の周波数帯域でのピーク部分が低減されており、充分な吸音効果が得られることが分かる。   Specifically, as shown in the graph of FIG. 5, in the vacuum cleaner 11 (solid line) provided with the silencer 32, in comparison with the conventional vacuum cleaner (dotted line) not provided with the silencer, It can be seen that the peak portion in the frequency band of 1 kHz or less is reduced, and a sufficient sound absorption effect can be obtained.

すなわち、電気掃除機11においては、電動送風機17の振動、電動送風機17の排気音、あるいは集塵部がサイクロン式の集塵装置である場合には、その風切り音など、騒音の殆どが１ｋＨｚ以下の周波数帯域に集中している。このため、上記消音器32を備えることにより、１ｋＨｚ以下の周波数帯域での騒音値、すなわち音圧値の合計を低減して、低騒音化を実現できるだけでなく、消音器32が様々な種類の騒音を効果的に低減できる。   That is, in the vacuum cleaner 11, most of noise such as vibration of the electric blower 17, exhaust sound of the electric blower 17, or wind noise when the dust collection part is a cyclone type dust collector is 1 kHz or less. Is concentrated in the frequency band. For this reason, by providing the silencer 32, not only can the noise value in the frequency band of 1 kHz or less, that is, the total of the sound pressure values be reduced to achieve low noise, but the silencer 32 can be of various types. Noise can be effectively reduced.

また、吸音材43を内管42の外面に複数回巻き付けることにより、吸音材43自体の厚みを大きくすることなく厚みが大きい吸音材を使用する場合と同様の吸音効果を得ることができるとともに、厚みが大きい吸音材を用いる場合のように内面側に皺が寄りにくく、この皺などに吸気風Ｗが当たることによる風切り音の発生や吸込効率の低下などを防止できる。   Further, by wrapping the sound absorbing material 43 around the outer surface of the inner tube 42 a plurality of times, it is possible to obtain the same sound absorbing effect as when using a large sound absorbing material without increasing the thickness of the sound absorbing material 43 itself, As in the case of using a sound-absorbing material having a large thickness, it is difficult for wrinkles to approach the inner surface side, and it is possible to prevent the generation of wind noise or the reduction in suction efficiency due to the intake air W hitting the wrinkles.

しかも、吸音材43を内管42の外面に対して螺旋状に多重に巻き付けるので、巻き付けられた吸音材43の多重部分に空気層56が形成されるため、この空気層56によって、消音器32の外部への音響反射を低減でき、消音器32による遮音効果をより高めることができる。   In addition, since the sound absorbing material 43 is spirally wound around the outer surface of the inner tube 42, an air layer 56 is formed at the multiple portions of the wound sound absorbing material 43, so that the silencer 32 is formed by the air layer 56. Therefore, the sound insulation effect by the silencer 32 can be further enhanced.

さらに、吸音材43の巻き始めの端部43bを、内管42の軸方向に沿う軸方向リブ42cと重なる位置とすることにより、電動送風機17の駆動により内管42内が負圧となっても、吸音材43の巻き始めの端部43bが内管42の孔部42aから内管42内に突出することがなく、また、吸音材43を内筒42の外面に対して螺旋状に多重に巻き付けることで形成される吸音材43の内面側の段差を内筒42の内側(連通風路35)に対して軸方向リブ42cの背面側に隠すことができるので、端部43bに対して、塵埃が絡み付いたり、吸気風Ｗが当たって風切り音が発生したり吸込効率が低下したりすることを確実に防止できる。   Further, by setting the winding start end 43b of the sound absorbing material 43 to a position overlapping the axial rib 42c along the axial direction of the inner tube 42, the inside of the inner tube 42 becomes negative pressure by driving the electric blower 17. However, the winding start end 43b of the sound absorbing material 43 does not protrude into the inner tube 42 from the hole 42a of the inner tube 42, and the sound absorbing material 43 is spirally multiplexed with respect to the outer surface of the inner tube 42. The step on the inner surface side of the sound absorbing material 43 formed by wrapping around the inner cylinder 42 can be concealed on the back side of the axial rib 42c with respect to the inner side (communication air passage 35). In addition, it is possible to reliably prevent dust from being entangled, wind noise being generated by the intake air W, and suction efficiency being lowered.

また、内管42の両端部に位置する周方向リブ43daを、内管42の他の位置の周方向リブ43dbよりも内管42の軸方向に幅広に形成することにより、吸音材43の両端部43a，43aが内管42の孔部42aから内管42内に突出することがなく、この突出した端部43a，43aに対して、塵埃が絡み付いたり、吸気風Ｗが当たって風切り音が発生したり吸込効率が低下したりすることを確実に防止できる。   Further, by forming the circumferential ribs 43da located at both ends of the inner tube 42 wider in the axial direction of the inner tube 42 than the circumferential ribs 43db at other positions of the inner tube 42, both ends of the sound absorbing material 43 The portions 43a and 43a do not protrude into the inner tube 42 from the hole 42a of the inner tube 42, and dust is entangled with the protruding ends 43a and 43a, or the wind noise is generated by the intake air W. It is possible to reliably prevent the occurrence and the reduction of the suction efficiency.

そして、上記消音器32を電気掃除機11の管部13に適用することにより、静音性を向上した電気掃除機11を得ることができる。   Then, by applying the silencer 32 to the tube portion 13 of the vacuum cleaner 11, the vacuum cleaner 11 with improved silence can be obtained.

特に、消音器32は、電動送風機17、あるいは集塵部18などの騒音の発生源に近い位置に配置することが望ましく、上記一実施の形態のように延長管24および床ブラシ25よりも基端側に位置する手元操作部23に配置することにより、電動送風機17、あるいは集塵部18から発生する騒音を効果的に吸音でき、床ブラシ25などからの騒音放射を低減できる。   In particular, the silencer 32 is preferably disposed at a position close to a noise generation source such as the electric blower 17 or the dust collector 18, and is based on the extension pipe 24 and the floor brush 25 as in the above embodiment. By arranging in the hand operating section 23 located on the end side, noise generated from the electric blower 17 or the dust collecting section 18 can be absorbed effectively, and noise radiation from the floor brush 25 and the like can be reduced.

しかも、手元操作部23の把持部37の下方は、デッドスペースとなっているため、この位置に消音器32を配置しても、消音器32が作業者の掃除作業の邪魔になることもない。   Moreover, since the lower portion of the gripping portion 37 of the hand operating portion 23 is a dead space, even if the silencer 32 is disposed at this position, the silencer 32 does not interfere with the worker's cleaning work. .

なお、上記一実施の形態において、消音器32は管部13の任意の位置に取り付けても同様の作用効果を得ることが可能であり、例えば本体吸込口19(掃除機本体12)との接続部である接続管部21に取り付ける構成などとしてもよい。   In the above-described embodiment, the silencer 32 can obtain the same effect even when attached to an arbitrary position of the pipe portion 13, for example, connection with the main body suction port 19 (the vacuum cleaner main body 12). It is good also as a structure attached to the connection pipe part 21 which is a part.

また、吸音材43は、内管42の外面側に対して多重に巻き付けず、１回巻き付けるだけの構成としてもよい。   Further, the sound absorbing material 43 may be configured to be wound only once without being wrapped around the outer surface side of the inner tube.

さらに、リブ部42bは、格子状であれば、内管42に任意に形成することができる。   Furthermore, the rib part 42b can be arbitrarily formed in the inner tube 42 as long as it has a lattice shape.

そして、電気掃除機11としては、例えば床ブラシ25を掃除機本体12の下部に接続したアップライト型、あるいはハンディ型など任意のものを用いることができ、掃除機本体12内の細部は、上記構成に限定されるものではない。   And as the vacuum cleaner 11, for example, an upright type in which the floor brush 25 is connected to the lower part of the vacuum cleaner body 12, or any handy type, such as a handy type, can be used. The configuration is not limited.

また、消音器32は、電気掃除機11に取り付けるものに限定されず、任意の吸排気システムに対して取り付けることができる。   The silencer 32 is not limited to the one attached to the electric vacuum cleaner 11, and can be attached to any intake / exhaust system.

11 電気掃除機
12 掃除機本体
13 吸込部としての管部
17 電動送風機
18 集塵部
32 消音器
41 外管
42 内管
42a 孔部
42b リブ部
42c 軸方向リブ
42d 交差方向リブとしての周方向リブ
43 吸音材 11 Vacuum cleaner
12 Vacuum cleaner body
13 Pipe section as suction section
17 Electric blower
18 Dust collector
32 Silencer
41 outer pipe
42 Inner pipe
42a hole
42b Ribs
42c Axial rib
42d Circumferential ribs as cross-direction ribs
43 Sound absorbing material

Claims (5)

筒状の外管と、
この外管の内方に配置された筒状の内管と、
この内管の外面側に巻き付けられてこの内管の外面と前記外管との間に位置し通気性を有する軟質の吸音材とを具備し、
前記内管は、
格子状に形成されたリブ部と、
このリブ部の間に位置し前記内管の外側と内側とを連通する孔部とを備えている
ことを特徴とした消音器。 A cylindrical outer tube,
A cylindrical inner tube disposed inside the outer tube;
A soft sound-absorbing material wound around the outer surface of the inner tube and positioned between the outer surface of the inner tube and the outer tube, and having air permeability;
The inner tube is
Ribs formed in a lattice shape;
A silencer characterized by comprising a hole portion located between the rib portions and communicating between the outside and the inside of the inner tube. 吸音材は、内管の外面に複数回巻き付けられている
ことを特徴とした請求項１記載の消音器。 The silencer according to claim 1, wherein the sound absorbing material is wound around the outer surface of the inner tube a plurality of times. リブ部は、
内管の軸方向に沿う成分を有する複数の軸方向リブと、
これら軸方向リブに交差する成分を有する複数の交差方向リブとを有し、
吸音材は、前記軸方向リブと重なる位置に巻き始めの端部が配置されている
ことを特徴とした請求項２記載の消音器。 The rib part
A plurality of axial ribs having components along the axial direction of the inner tube;
A plurality of cross-direction ribs having components crossing these axial ribs;
The silencer according to claim 2, wherein the sound-absorbing material has a winding start end disposed at a position overlapping the axial rib. リブ部は、
内管の軸方向に沿う成分を有する複数の軸方向リブと、
これら軸方向リブに交差する成分を有する複数の交差方向リブとを有し、
内管の端部に位置する前記交差方向リブは、前記内管の他の位置の前記交差方向リブよりも前記内管の軸方向に幅広に形成されている
ことを特徴とした請求項１ないし３いずれか一記載の消音器。 The rib part
A plurality of axial ribs having components along the axial direction of the inner tube;
A plurality of cross-direction ribs having components crossing these axial ribs;
The cross-direction rib located at an end portion of the inner pipe is formed wider in the axial direction of the inner pipe than the cross-direction rib at another position of the inner pipe. 3. The silencer according to any one of 3. 電動送風機を収容した掃除機本体と、
この掃除機本体の前記電動送風機の吸込側に位置する集塵部と、
この集塵部の上流側に位置する吸込部と、
この吸込部に配置された請求項１ないし４いずれか一記載の消音器と
を具備したことを特徴とした電気掃除機。 A vacuum cleaner body containing an electric blower,
A dust collector located on the suction side of the electric blower of the vacuum cleaner body;
A suction section located upstream of the dust collection section;
A vacuum cleaner comprising: the silencer according to any one of claims 1 to 4 disposed in the suction portion.
JP2009181284A 2009-08-04 2009-08-04 Silencer and vacuum cleaner Active JP5395560B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012243416A (en) * 2011-05-16 2012-12-10 Toyota Motor Corp Air supply device of vehicular fuel cell
JP2015146956A (en) * 2014-02-07 2015-08-20 三菱電機株式会社 vacuum cleaner
KR20170102458A (en) * 2015-01-09 2017-09-11 데이코 아이피 홀딩스 엘엘시 Noise attenuating member for noise attenuating units in engines

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0953437A (en) * 1995-08-14 1997-02-25 Nichias Corp Muffler
JP2656661B2 (en) * 1990-11-24 1997-09-24 株式会社日立製作所 Electric vacuum cleaner
JP2002138829A (en) * 2000-11-06 2002-05-17 Komatsu Zenoah Co Air duct with sound absorbing material and manufacturing method thereof
WO2005093333A1 (en) * 2004-03-26 2005-10-06 Innosource B.V. Ventilation system and intake pipe
JP2007170315A (en) * 2005-12-24 2007-07-05 Daiwa:Kk Muffler and manufacturing method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2656661B2 (en) * 1990-11-24 1997-09-24 株式会社日立製作所 Electric vacuum cleaner
JPH0953437A (en) * 1995-08-14 1997-02-25 Nichias Corp Muffler
JP2002138829A (en) * 2000-11-06 2002-05-17 Komatsu Zenoah Co Air duct with sound absorbing material and manufacturing method thereof
WO2005093333A1 (en) * 2004-03-26 2005-10-06 Innosource B.V. Ventilation system and intake pipe
JP2007170315A (en) * 2005-12-24 2007-07-05 Daiwa:Kk Muffler and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012243416A (en) * 2011-05-16 2012-12-10 Toyota Motor Corp Air supply device of vehicular fuel cell
JP2015146956A (en) * 2014-02-07 2015-08-20 三菱電機株式会社 vacuum cleaner
KR20170102458A (en) * 2015-01-09 2017-09-11 데이코 아이피 홀딩스 엘엘시 Noise attenuating member for noise attenuating units in engines
KR102269213B1 (en) * 2015-01-09 2021-06-24 데이코 아이피 홀딩스 엘엘시 Noise attenuating member for noise attenuating units in engines

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