JP2013034592A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of effectively muffling noise generated by suction wind flowing inside of an extending tube and capable of enhancing silencing performance of the vacuum cleaner.SOLUTION: In the vacuum cleaner having a cleaner body incorporating an electric blower generating the suction wind for sucking dusts on a surface to be cleaned and the extending tube arranged in a suction wind path where the suction wind generated by the electric blower reaches the cleaner body, the extending tube is constituted of: a cylindrical body having an air-sucking flow path constituting a part of the suction wind path therein and at least one opening parts; an outer lid attached to the cylindrical body and covering the opening part; and a sound absorbing member arranged between the opening part and the outer lid. The sound absorbing member is formed such that the density of an outer lid side is higher than the density of the opening part side.

Description

  The present invention relates to a vacuum cleaner having an extension tube.

  Conventionally, in this type of vacuum cleaner, a configuration in which a sound absorbing material is arranged on an extension pipe has been proposed in order to improve the silent performance of the vacuum cleaner (see, for example, Patent Document 1).

  That is, as shown in FIG. 9, an extension tube 200 of a conventional vacuum cleaner (not shown) is fitted into a cylindrical body 202 having an opening 201 along the longitudinal direction on the top surface, and fitted into the opening 201 from the outside. The inner lid 204 is welded and has numerous sound absorbing holes 203 on the bottom surface, and is welded to the upper end of the inner lid 204 and is in contact with the rib (not shown) of the cylindrical body 202 outside the inner lid 204. An outer lid 205 and a sound absorbing material 206 sandwiched between the inner lid 204 and the outer lid 205.

JP-A-2-307418

  However, in the extension pipe of the conventional vacuum cleaner, there is still room for improvement from the viewpoint of effectively silencing noise generated by the air flowing through the extension pipe and improving the silent performance of the vacuum cleaner. .

  That is, in the extension pipe of the conventional vacuum cleaner, since the sound absorbing material formed with a single density is arranged in the extension pipe, the noise generated by the air flowing in the extension pipe is efficiently reduced in the sound absorbing material. In some cases, it could not be diffused. Therefore, the noise generated by the air flowing through the extension pipe cannot be efficiently silenced by the sound absorbing material, and the noise of the vacuum cleaner may not be reduced.

  The present invention has been made in view of the above-described problems of the prior art, and can efficiently mute noise generated by suction air flowing inside the extension pipe, and improve the silent performance of the vacuum cleaner. An object of the present invention is to provide an electric vacuum cleaner that can be used.

  In order to solve the above-described problems of the prior art, the present invention is directed to a vacuum cleaner main body including an electric blower that generates suction air for sucking dust on a surface to be cleaned, and suction air generated by the electric blower is a vacuum cleaner. An extension pipe disposed in the suction air passage leading to the main body, and the extension pipe includes an intake passage that constitutes a part of the suction air passage and has at least one opening. And an outer lid that covers the opening and a sound absorbing member that is disposed between the opening and the outer lid, and the sound absorbing member has a density on the outer lid side. Provided is a vacuum cleaner that is formed so as to be higher in density than an opening side.

Thereby, since the sound absorbing member is formed so that the density on the outer lid side is higher than the density on the opening side, the noise generated by the suction air flowing through the intake passage formed inside the cylinder is opened. The sound can be efficiently diffused from the inside of the sound absorbing member, the noise generated by the suction air flowing inside the cylinder can be effectively silenced by the sound absorbing member, and the silent performance of the vacuum cleaner is improved. Can do.

  According to the vacuum cleaner of the present invention, the noise generated by the suction air flowing through the intake passage formed inside the cylinder can be efficiently diffused from the opening to the inside of the sound absorbing member. The noise generated by the flowing suction air can be effectively silenced by the sound absorbing member, and the silent performance of the electric vacuum cleaner can be improved.

Whole perspective view which shows Embodiment 1 of the vacuum cleaner of this invention Whole sectional drawing of the vacuum cleaner main body in Embodiment 1 of the vacuum cleaner of this invention (A) The whole perspective view of the extension tube which shows the state by which the 2nd pipe body was accommodated in the inside of the 1st pipe body in Embodiment 1 of the vacuum cleaner of this invention, (b) The electric cleaning of this invention The whole perspective view of the extension pipe which shows the state where the 1st pipe and the 2nd pipe in Embodiment 1 of the machine extended Overall cross-sectional view at the center in the longitudinal direction of the extension pipe shown in FIG. The perspective exploded view of the 1st pipe body in Embodiment 1 of the vacuum cleaner of this invention The disassembled perspective view of the 2nd pipe body at the time of seeing the 2nd pipe body in Embodiment 1 of the vacuum cleaner of this invention from upper direction (arrow X direction as described in FIG. 3) The disassembled perspective view of the 2nd pipe body at the time of seeing the 2nd pipe body in Embodiment 1 of the vacuum cleaner of this invention from upper direction (arrow Y direction as described in FIG. 3) Whole sectional drawing in the center part of the longitudinal direction of the extension tube in Embodiment 2 of the vacuum cleaner of this invention A perspective exploded view showing an extension tube of a conventional vacuum cleaner

  1st invention arrange | positions in the suction air path from the vacuum cleaner main body which incorporates the electric blower which generate | occur | produces the suction wind which attracts | sucks the dust of the to-be-cleaned surface, and the suction wind generated by the electric blower reaches the cleaner body An extension pipe, and the extension pipe has an intake passage that forms a part of the suction air passage inside, and a cylinder having at least one opening, and is attached to the cylinder, An outer lid that covers the opening, and a sound absorbing member disposed between the opening and the outer lid, and the sound absorbing member has a density on the outer lid side higher than a density on the opening side. This is a vacuum cleaner formed in

  Thereby, since the sound absorbing member is formed so that the density on the outer lid side is higher than the density on the opening side, the noise generated by the suction air flowing through the intake passage formed inside the cylinder is opened. The sound can be efficiently diffused from the inside of the sound absorbing member, the noise generated by the suction air flowing inside the cylinder can be effectively silenced by the sound absorbing member, and the silent performance of the vacuum cleaner is improved. Can do.

  According to a second invention, in particular, in the first invention, the sound absorbing member is formed of a plurality of sound absorbing materials.

  Thereby, the sound absorbing member can be easily formed so that the density on the outer lid side of the sound absorbing member is higher than the density on the opening side, and the sound absorbing member is placed on the shape of the cylinder or the shape of the opening. Therefore, the noise generated by the suction air flowing in the intake passage formed inside the cylinder can be efficiently diffused from the opening into the sound absorbing member, and the suction flowing inside the cylinder The noise generated by the wind can be efficiently silenced by the sound absorbing member, and the silent performance of the vacuum cleaner can be improved.

In the third invention, in particular, in the second invention, a gap is formed between the plurality of sound absorbing materials.

  As a result, the noise generated by the suction air flowing through the intake passage formed inside the cylindrical body is diffused into the sound absorbing material and then into the gap formed between the plurality of sound absorbing materials, that is, in the air layer. Since it is diffused and diffused again into the sound absorbing material, noise generated by the suction air flowing through the intake passage formed inside the cylinder can be effectively silenced by the sound absorbing material, and between the plurality of sound absorbing materials. Noise can be attenuated by the formed gap. Therefore, the noise generated by the suction air flowing through the intake passage formed inside the cylinder can be efficiently silenced by the sound absorbing member, and the silent performance of the electric vacuum cleaner can be improved.

  According to a fourth aspect of the invention, in particular, in the first to third aspects of the invention, the sound absorbing member is arranged at the lower part of the cylindrical body.

  As a result, the sound absorbing performance of the sound absorbing member can be maintained, and the noise generated by the suction air flowing through the intake passage formed inside the cylinder can be efficiently silenced by the sound absorbing member. Silent performance can be improved.

  In the fifth invention, in particular, in the first to fourth inventions, a rib extending from the inner surface of the outer lid toward the cylindrical body is provided at a position facing the opening of the outer lid. , The outer lid, the rib, and the opening formed in the space formed by the opening.

  Thereby, by arranging the sound absorbing member inside the space formed by the outer lid, the rib, and the opening, the sound absorbing member does not come off from the position facing the opening during the cleaning operation. The sound absorbing member can be reliably held between the outer lid and the outer lid. Therefore, the noise generated by the suction air flowing through the intake passage formed inside the cylinder can be efficiently and surely diffused from the opening into the sound absorbing member, and generated by the suction air flowing inside the cylinder. The noise can be effectively silenced by the sound absorbing member, and the silent performance of the vacuum cleaner can be improved.

  Hereinafter, a preferred embodiment of a vacuum cleaner of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

(Embodiment 1)
Embodiment 1 of the vacuum cleaner of this invention is demonstrated using FIGS.

  FIG. 1 is an overall perspective view showing Embodiment 1 of the electric vacuum cleaner of the present invention. FIG. 2 is an overall cross-sectional view of the cleaner body in the first embodiment of the electric vacuum cleaner of the present invention. Further, FIG. 3A is an overall perspective view of the extension pipe showing a state in which the second pipe body is housed in the first pipe body in the first embodiment of the electric vacuum cleaner of the present invention, FIG. (B) is the whole perspective view of the extension pipe which shows the extension state of the 1st pipe body and the 2nd pipe body in Embodiment 1 of the electric vacuum cleaner of the present invention. FIG. 4 is an overall cross-sectional view at the center in the longitudinal direction of the extension pipe shown in FIG. Furthermore, FIG. 5 is a perspective exploded view of the first tubular body in the first embodiment of the electric vacuum cleaner of the present invention. FIG. 6 is an exploded perspective view of the second tubular body when the second tubular body in Embodiment 1 of the vacuum cleaner of the present invention is viewed from above (in the direction of arrow X in FIG. 3). . Further, FIG. 7 is an exploded perspective view of the second tubular body when the second tubular body in the first embodiment of the electric vacuum cleaner of the present invention is viewed from above (in the direction of arrow Y in FIG. 3). .

As shown in FIG. 1, the vacuum cleaner 100 includes a vacuum cleaner body 1 that includes an electric blower (not shown) that generates suction air, and a dust collector 2 that is detachably connected to the vacuum cleaner body 1. The suction tool 3 for sucking dust on the surface to be cleaned, the hose 4 with one end detachably connected to the suction port 1a provided at the front of the cleaner body 1, and the one end attached to the other end of the hose 4 The extension tube 5 is connected freely and the other end is detachably connected to the suction tool 3.

  The suction tool 3 includes a rotating brush (not shown) that scrapes dust on the surface to be cleaned and an electric motor (not shown) that rotates the rotating brush (not shown). Further, a tip pipe 7 having a handle portion 6 held by the user at the time of cleaning is provided at the end of the hose 4 on the side of the extension pipe 5, and the hose 4 is extended through the tip pipe 7. The tube 5 is detachably connected. Further, a connection pipe 8 is provided at the end of the hose 4 on the cleaner body 1 side, and the suction port 1a of the cleaner body 1 and the hose 4 are detachably connected via the connection pipe 8. ing.

  As shown in FIG.1 and FIG.2, the electric blower chamber 10 which accommodates the electric blower 9 which generate | occur | produces a suction wind is arrange | positioned at the rear part of the cleaner body 1. As shown in FIG. In addition, a dust collector attachment portion 11 to which a dust collector 2 that separates and collects dust sucked by the suction air generated by the electric blower 9 is detachably attached is disposed at the front portion of the cleaner body 1. Has been. Further, a pair of traveling wheels 12 are disposed on both side portions of the rear side of the cleaner body 1, and the wheels 12 are rotatably attached to the cleaner body 1. A traveling caster 13 is rotatably disposed in front of the bottom surface of the cleaner body 1. Furthermore, a main body handle 14 that is held when the user carries the cleaner main body 1 is provided on the upper portion of the cleaner main body 1.

  As shown in FIG. 2, the dust collector 2 includes a substantially cylindrical dust collector body 15 having openings (not shown) at both ends, and the dust collector body 15 is concentric with the dust collector body 15. A primary filter 16 disposed on the upper side of the primary filter 16, an umbrella-shaped extension 17 attached to the lower end of the primary filter 16, a secondary filter 18 disposed above the primary filter 16, and an upper end of the dust collector main body 15. An opening (not shown) and an upper lid 19 that covers the upper surface of the secondary filter 18 and a dust collector main body 15 are pivotally supported by the pivot, and an opening at the lower end of the dust collector main body 15 (not shown). And a dust collector handle 21 pivotally supported by the upper lid 19 so as to be openable and closable. Further, a dust removing means 22 for removing dust attached to the secondary filter 18 is disposed between the secondary filter 18 and the upper lid body 19. Furthermore, a driving means 23 for driving the dust removing means 22 is built in the upper lid body 19.

  As shown in FIGS. 3 and 4, the extension pipe 5 includes a first pipe body 24 having one end detachably connected to the tip pipe 7 of the hose 4, and one end connected to the other end of the first pipe body 24. The second tube body 25 is slidably connected and the other end is detachably connected to the suction tool 3.

  As shown in FIGS. 3 to 5, one end of the first tube body 24 is detachably connected to the tip pipe 7 of the hose 4, and the second tube body 25 is slidably inserted into the other end. In addition, a first cylinder 27 having a first intake passage 26 through which suction air generated by the electric blower 9 flows, an upper cover body 28 attached to the upper part of the first cylinder 27, and a first And a lower cover body 29 attached to the lower part of one cylindrical body 27. Further, the upper cover body 28 and the lower cover body 29 are formed so that the length in the longitudinal direction is substantially the same as the length in the longitudinal direction of the first cylindrical body 27.

  At the upper part of the end portion of the first tubular body 27 on the second tubular body 25 side, a sliding operation section 30 that releases and regulates the sliding movement of the first tubular body 24 and the second tubular body 25. Is provided. In addition, an engaging protrusion 30 a that operates in conjunction with the operation of the sliding operation unit 30 is provided at a lower portion of the end portion of the first cylindrical body 27 on the second tube body 25 side.

  Here, in this Embodiment, the upper part of the 1st cylinder 27 is an upper part in the radial direction of the 1st cylinder 27, and is the arrow X side shown to FIGS. Moreover, the lower part of the 1st cylinder 27 is a lower part in the radial direction of the 1st cylinder 27, and is the arrow Y side shown to FIGS.

  The upper cover body 28 includes a first cover body 28 a that covers the upper surface of the first cylindrical body 27, and a second cover body 28 b that covers the upper surface of the sliding operation unit 30. The second cover body 28b has a through hole for causing the sliding operation portion 30 to protrude from the upper surface of the first tubular body 24 in a state where the second cover body 28b is attached to the first cylindrical body 27. A portion 28c is provided. Further, the first cover body 28a, the second cover body 28b, and the lower cover body 29 are fitted into a plurality of fitting recesses (not shown) provided in the first cylindrical body 27. A claw portion (not shown) is provided, and a fitting claw portion (not shown) provided on the first cover body 28a, the second cover body 28b, and the lower cover body 29 and the first cover body 28a. The first cover body 28a, the second cover body 28b, and the lower cover body 29 become the first cylindrical body by fitting with a fitting recess (not shown) provided in the cylindrical body 27. 27.

  The first cover body 28 a and the first cylinder body 27 are attached so that a space 31 is formed between the first cover body 28 a and the first cylinder body 27. In addition, a sliding support portion 37 provided on the second tubular body 25 described later is inserted below the sliding operation portion 30, that is, between the sliding operation portion 30 and the first cylindrical body 27. An insertion port 32 is provided, and a sliding support portion 37 to be described later inserted through the insertion port 32 is a space portion 31 formed between the first cylindrical body 27 and the first cover body 28a. It is slidably housed inside. Further, a commercial power source (not shown) supplied to the cleaner body 1 is supplied to the suction tool 3 via the hose 4 and the extension pipe 5 in the space 31 and the sliding support part 37 described later. Conductive wires (not shown) are arranged.

  As shown in FIGS. 3, 4, 6, and 7, the second tubular body 25 is slidably inserted into the first tubular body 27 of the first tubular body 24 at one end, A suction tool 3 is detachably connected to the other end, and a second cylindrical body 34 having a second intake flow path 33 communicating with the first intake flow path 26 inside, and a second cylindrical body 34. And an outer lid 35 attached to the lower part of the outer cover.

  An attachment / detachment operation unit 36 for attaching and detaching the second tubular body 25 and the suction tool 3 is provided at the upper part of the end of the second cylinder 34 on the suction tool 3 side. Further, an upper portion of an end of the second cylindrical body 34 on the suction tool 3 side is disposed behind the attachment / detachment operation unit 36, that is, from the end of the attachment / detachment operation unit 36 on the first tubular body 24 side. A sliding support portion 37 extending toward the body 24 is provided. The sliding support portion 37 has substantially the same length as the length from the rear of the attachment / detachment operation portion 36 of the second cylinder 34 to the end portion of the second cylinder 34 on the first tube body 24 side. Is formed. The second tubular body 25 has an end portion of the second tubular body 34 on the first tubular body 24 side slidably inserted into the first tubular body 27, and a sliding support portion 37. The end portion of the first tube body 24 side is slidably inserted into the space 31 through the insertion port 32 of the first tube body 24, so that it slides with respect to the first tube body 24. Connected freely. Further, a cavity 38 is formed inside the sliding support part 37, and a commercial power source (not shown) supplied to the cleaner body 1 is connected to the hose 4 and the extension pipe inside the cavity 38. A conducting wire (not shown) to be supplied to the suction tool 3 through 5 is arranged.

  Here, in this Embodiment, the upper part of the 2nd cylinder 34 is an upper part in the radial direction of the 2nd cylinder 34, and is the arrow X side shown to FIGS. Moreover, the lower part of the 2nd cylinder 34 is a lower part in the radial direction of the 2nd cylinder 34, and is the arrow Y side shown to FIGS.

An opening 39 communicating with the second intake flow path 33 formed inside the second cylinder 34 is formed in the lower part of the second cylinder 34 along the longitudinal direction of the second cylinder 34. The outer lid 35 is attached to the lower portion of the second cylindrical body 34 so as to cover the opening 39. The opening 39 covers the opening 39 and communicates with the second intake flow path 33.
An inner lid 41 is disposed. Further, when the suction air generated by the electric blower 9 flows between the opening 39 and the outer lid 35, that is, between the inner lid 41 and the outer lid 35, the second intake passage 33. A sound absorbing member 42 that absorbs the generated noise is disposed.

  The outer surface of the outer lid 35, that is, the surface on the arrow Y side shown in FIGS. 3 to 7 of the outer lid 35, was provided below the end portion of the first tubular body 24 on the second tubular body 25 side. A plurality of engaging recesses 35 a that engage with the engaging protrusions 30 a are provided at equal intervals along the longitudinal direction of the outer lid 35. The first tubular body 24 and the second tubular body 25 are formed by engaging the engaging protrusion 30a of the first cylindrical body 27 with the engaging concave portion 35a of the second cylindrical body 34. The sliding of the first tubular body 24 and the second tubular body 25 is restricted, and the user operates the sliding operation section 30 to engage the engaging protrusion 30a of the first cylindrical body 27 and the second tubular body 27. By disengaging the engaging recess 35a of the cylindrical body 34, the first tubular body 24 and the second tubular body 25 can be slid. In addition, the first tube body 24 and the second tube body 25 are configured so that the user operates the sliding operation portion 30 to release the engagement between the engagement protrusion portion 30a and the engagement recess portion 35a and the second tube body 25. By engaging one of the engagement recesses 35a of the plurality of engagement recesses 35a provided on the outer lid 35 of the tube body 25 with the engagement protrusion 30a, the first tube body 24 The length of the second tubular body 25 that moves forward can be adjusted, and the length of the extension tube 5 can be set to an arbitrary length.

  A rib 43 extending from the inner surface of the outer lid 35 toward the inner lid 41 is formed on the inner surface of the outer lid 35, that is, the surface on the arrow X side shown in FIGS. The rib 43 is formed so as to surround the entire circumference of the opening 39 at a position facing the opening 39 of the outer lid 35, and in a state where the outer lid 35 is attached to the second cylindrical body 34, It is formed so as to contact the lower surface of the second cylindrical body 34. In addition, the inner lid 41 is attached to the second cylinder 34, and the inner surface of the inner lid 41, that is, the surface of the inner lid 41 on the arrow X side shown in FIGS. It is comprised so that it may become flush with the inner surface of 34.

  The sound absorbing member 42 is disposed inside a space (not shown) formed by the outer lid 35, the rib 43, and the inner lid 41, and the length in the longitudinal direction is the length in the longitudinal direction of the opening 39. It is formed so as to have substantially the same length, and the length in the short direction is substantially the same as the length of the opening 39 in the short direction. The sound absorbing member 42 is formed by overlapping a plurality of sound absorbing materials (not shown) such that the density on the outer lid 35 side is higher than the density on the inner lid 41 side.

Here, in the present embodiment, the density on the outer lid 35 side of the sound absorbing member 42 and the density on the inner lid 41 side of the sound absorbing member 42 are 1 cm in thickness of the sound absorbing member 42 and 1 m ^{2 in} area of the sound absorbing member 42. It is the gram number of the sound-absorbing material (not shown) contained in the outer lid 35 side and the inner lid 41 side of the sound-absorbing member 42.

  In general, with the hose 4, the extension pipe 5, and the suction tool 3 connected to the vacuum cleaner body 1, the user starts the operation of the vacuum cleaner 100 and the electric blower 9 generates suction air. Then, dust on the surface to be cleaned flows into the cleaner main body 1 from the suction port 1a through a suction air passage (not shown) formed by the suction tool 3, the extension pipe 5, and the hose 4. At this time, in the suction air path (not shown) from the suction tool 3 to the cleaner body 1 by the suction air generated by the electric blower 9, the inner wall of the extension pipe 5, the suction tool 3 and the extension pipe 5 Due to the friction between the connecting portion (not shown) and the connecting portion (not shown) between the extension pipe 5 and the hose 4 and the suction air, noise including a high frequency region of 1 kHz or more may be generated. A sound in a high frequency region of 1 kHz to 4 kHz may give a user an unpleasant feeling.

Therefore, in order to sufficiently prevent the user from feeling uncomfortable due to noise including a high frequency region of 1 kHz or higher generated in the suction air passage, noise including a high frequency region of 1 kHz or higher generated in the suction air passage is reduced. In particular, in noise including a high frequency region of 1 kHz or more, it is necessary to reduce sound in a high frequency region of 1 kHz to 4 kHz.

  Therefore, the sound absorbing member 42 only needs to be formed so that the density of the sound absorbing member 42 on the outer lid 35 side is higher than the density of the inner lid 41, but the viewpoint of reducing sound in a high frequency region of 1 kHz or more. Since the density on the outer lid 35 side of the sound absorbing member 42 is D1 and the density on the inner lid 41 side is D2, the density D1 on the outer lid 35 side of the sound absorbing member 42 and the inner lid 41 side of the sound absorbing member 42 are It is preferable that the density D2 satisfies the conditions (1) and (2).

Condition (1) 200 ≦ D1 ≦ 800
Condition (2) 0.1 × D1 ≦ D2 ≦ 0.9 × D1
Hereinafter, the relationship between the density D1 on the outer lid 35 side of the sound absorbing member 42 and the density D2 on the inner lid 41 side of the sound absorbing member 42 will be described with reference to Table 1 as a result of experiments.

The extension tube 5 used in the experiment was made of ABS resin. Further, the radial cross-sectional area of the second intake passage 33 formed in the second cylinder 34 is 900 mm ² , the length of the second cylinder 34 in the longitudinal direction is 440 mm, and the second The flow rate of the suction air flowing inside the cylinder 34 was set to 2.5 m ³ / min. The inner lid 41 was formed with 382 communication ports 40 having a diameter of 2.2 mm.

Determination, a noise generated in the second cylindrical body 34 when the flow rate within the second cylindrical body 34 having no opening 39 and the sound absorbing member 42 was flowing air as 2.5 m 3 / ^min When noise is generated in the second cylinder 34 when air is flowed at a flow rate of 2.5 m ³ / min inside the second cylinder 34 provided with the sound absorbing member 42, The sound absorbing member 42 can reduce the sound in the high frequency region of 1 kHz or more by 30% or more. If it can be used as a product, the sound absorbing member 42 can reduce the sound in the high frequency region of 1 kHz or more by 10% or more and less than 30%. When it can be used as a product, Δ, when the sound absorbing member 42 can reduce the sound in a high frequency region of 1 kHz or more by less than 10%, and when it cannot be used as a product, it is evaluated as x.

  As shown in Table 1, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 100 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. From 1.1 to 1.1 times, the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced in all the densities D2 on the inner lid 41 side of the sound absorbing member 42. This is because the density D1 on the outer lid 35 side of the sound absorbing member 42 is too low, and noise that has entered the sound absorbing member 42 from the plurality of communication ports 40 cannot be silenced on the outer lid 35 side of the sound absorbing member 42. I think that the.

  The density D1 on the outer lid 35 side of the sound absorbing member 42 is 1000 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.1 to 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. In the case where the sound absorption member 42 is changed, the sound in the high frequency region of 1 kHz or more cannot be sufficiently reduced in all the densities D2 on the inner lid 41 side of the sound absorbing member 42. This is because the density D1 on the outer lid 35 side of the sound absorbing member 42 is too high, so that the sound absorbing member 42 cannot be efficiently diffused from the inner lid 41 side of the sound absorbing member 42 to the outer lid 35 side of the sound absorbing member 42. This is probably because the sound could not be silenced on the outer lid 35 side. The density D1 on the outer lid 35 side of the sound absorbing member 42 is 1000 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. Even when the frequency was doubled, the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced. This is because the density D2 on the inner lid 41 side of the sound absorbing member 42 is too high, and noise that has entered the sound absorbing member 42 from the plurality of communication ports 40 is blocked by the inner lid 41 side of the sound absorbing member 42, and the sound absorbing member This is probably because the inside of 42 could not be diffused efficiently.

  Furthermore, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 200 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.1 to 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When the frequency is changed to twice, the sound in the high frequency region of 1 kHz or more can be reduced at all the densities D2 on the inner lid 41 side of the sound absorbing member 42, and in particular, the sound in the high frequency region near 4 kHz can be reduced. I was able to. However, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 1000 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When doubled, the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced. This is because, as the density of the sound absorbing member 42 is lower, the sound absorbing member 42 is more likely to absorb a sound in a high frequency region in a high frequency region of 1 kHz or more, and the frequency region of the sound that can be absorbed by the sound absorbing member 42 is narrowed. The higher the density of the sound absorbing member 42, the easier it is to absorb a wide range of sounds from a low frequency region to a high frequency region in a high frequency region of 1 kHz or higher, and a wider frequency range of sound that can be absorbed by the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 is set to 200 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is set to 0.1 to 0.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. In the case of changing it up to 9 times, the sound absorbing member 42 receives noise including sound in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40. The sound is efficiently diffused from the inner lid 41 side to the outer lid 35 side of the sound absorbing member 42, and in the high frequency region of 1 kHz or higher, the sound in the frequency region higher than 4 kHz is absorbed by the inner lid 41 side of the sound absorbing member 42. In addition, it seems that the sound in the frequency region near 4 kHz out of the sound in the high frequency region of 1 kHz or more was absorbed on the outer lid 35 side of the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 is 200 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When the frequency is doubled, only the sound in the frequency region near 4 kHz is absorbed among the noise including the sound in the high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40. It seems that the sound of the area could not be reduced sufficiently.

Further, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 400 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.1 to 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When the frequency is changed to twice, the sound in the high frequency region of 1 kHz or more can be reduced at all the densities D2 on the inner lid 41 side of the sound absorbing member 42, and particularly from 1 kHz that is likely to cause discomfort to the user. The sound in the high frequency region of 4 kHz could be sufficiently reduced. However, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 400 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When doubled, the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced. This is because the density D1 on the outer lid 35 side of the sound absorbing member 42 is 400 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is the density on the outer lid 35 side of the sound absorbing member 42 due to the characteristics of the sound absorbing member 42 described above. When changing from 0.1 times to 0.9 times D1, noise including noise in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40 is applied to the inner lid 41 of the sound absorbing member 42. The sound is efficiently diffused from the side to the outer lid 35 side of the sound absorbing member 42, and the sound in the frequency region higher than 4 kHz is absorbed on the inner lid 41 side of the sound absorbing member 42 among the sounds in the high frequency region of 1 kHz or more, This is probably because the sound in the high frequency region of 1 kHz to 4 kHz that easily gives the user discomfort among the sound in the high frequency region of 1 kHz or higher was absorbed on the outer lid 35 side of the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 is 200 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When the frequency is doubled, only noise in the high frequency range of 1 kHz to 4 kHz is absorbed in the noise including the high frequency range of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40. Therefore, it seems that the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced. In the case where the density D1 on the outer lid 35 side of the sound absorbing member 42 is 400 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 and the density D2 on the inner lid 41 side of the sound absorbing member 42 are substantially the same density, and the density D1 on the outer lid 35 side of the sound absorbing member 42 and the inside of the sound absorbing member 42 are Since the difference from the density D2 on the lid 41 side is reduced, the frequency of sound absorbed by the outer lid 35 side of the sound absorbing member 42 and the inner lid 41 side of the sound absorbing member 42 is substantially the same. Therefore, in the case where the density D1 on the outer lid 35 side of the sound absorbing member 42 is 400 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. Is less likely to absorb sound on the inner lid 41 side of the sound absorbing member 42 than in the case where the density D1 of the sound absorbing member 42 is 0.1 to 0.8 times the density D1 on the outer lid 35 side. It seems that the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced.

Further, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 600 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.1 to 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When the frequency is changed to twice, the sound in the high frequency region of 1 kHz or more can be reduced at all the densities D2 on the inner lid 41 side of the sound absorbing member 42, and particularly from 1 kHz that is likely to cause discomfort to the user. The sound in the high frequency region of 4 kHz could be sufficiently reduced. However, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 600 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When doubled, the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced. This is because the density D1 on the outer lid 35 side of the sound absorbing member 42 is 600 g and the density D2 on the inner lid 41 side of the sound absorbing member 42 is the density on the outer lid 35 side of the sound absorbing member 42 due to the characteristics of the sound absorbing member 42 described above. When changing from 0.1 times to 0.9 times D1, noise including noise in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40 is applied to the inner lid 41 of the sound absorbing member 42. The sound is efficiently diffused from the side to the outer lid 35 side of the sound absorbing member 42, and the sound in the frequency region higher than 4 kHz is absorbed on the inner lid 41 side of the sound absorbing member 42 among the sounds in the high frequency region of 1 kHz or more, This is probably because the sound in the high frequency region of 1 kHz to 4 kHz that easily gives the user discomfort among the sound in the high frequency region of 1 kHz or higher was absorbed on the outer lid 35 side of the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 is 600 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. In the case of double, the density D2 on the inner lid 41 side of the sound absorbing member 42 is too high, so that it cannot be efficiently diffused from the inner lid 41 side of the sound absorbing member 42 to the outer lid 35 side of the sound absorbing member 42. This is probably because noise including noise in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40 could not be silenced by the sound absorbing member 42. In the case where the density D1 on the outer lid 35 side of the sound absorbing member 42 is 600 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. Since the density D2 on the inner lid 41 side of the sound absorbing member 42 is higher than that in the case where the density D1 on the outer lid 35 side of the sound absorbing member 42 is 0.1 to 0.8 times, the plurality of communication ports 40 Thus, it is considered that noise including sound in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 is less likely to be diffused into the sound absorbing member 42, and the sound absorbing member 42 is difficult to efficiently mute.

  Furthermore, the density D1 on the outer lid 35 side of the sound absorbing member 42 is set to 800 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.1 to 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When the frequency is changed to twice, the sound in the high frequency region of 1 kHz or more can be reduced at all the densities D2 on the inner lid 41 side of the sound absorbing member 42, and particularly from 1 kHz that is likely to cause discomfort to the user. The sound in the high frequency region of 4 kHz could be sufficiently reduced. However, the density D1 on the outer lid 35 side of the sound absorbing member 42 is 800 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. When doubled, the sound in the high frequency region of 1 kHz or more could not be sufficiently reduced. This is because the density D1 on the outer lid 35 side of the sound absorbing member 42 is set to 800 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is set to the density on the outer lid 35 side of the sound absorbing member 42 due to the characteristics of the sound absorbing member 42 described above. When changing from 0.1 times to 0.9 times D1, noise including noise in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40 is applied to the inner lid 41 of the sound absorbing member 42. The sound is efficiently diffused from the side to the outer lid 35 side of the sound absorbing member 42, and the sound in the frequency region higher than 4 kHz is absorbed on the inner lid 41 side of the sound absorbing member 42 among the sounds in the high frequency region of 1 kHz or more, This is probably because the sound in the high frequency region of 1 kHz to 4 kHz that easily gives the user discomfort among the sound in the high frequency region of 1 kHz or higher was absorbed on the outer lid 35 side of the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 is 800 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 1.0 times and 1.1 times the density D1 on the outer lid 35 side of the sound absorbing member 42. In the case of double, the density D2 on the inner lid 41 side of the sound absorbing member 42 is too high, so that it cannot be efficiently diffused from the inner lid 41 side of the sound absorbing member 42 to the outer lid 35 side of the sound absorbing member 42. This is probably because noise including noise in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40 could not be silenced by the sound absorbing member 42. The density D1 on the outer lid 35 side of the sound absorbing member 42 is 800 g, and the density D2 on the inner lid 41 side of the sound absorbing member 42 is 0.7 to 0.9 times the density D1 on the outer lid 35 side of the sound absorbing member 42. In the case of doubling, the density D2 on the inner lid 41 side of the sound absorbing member 42 is higher than the density D1 of 0.1 to 0.6 times the density D1 on the outer lid 35 side of the sound absorbing member 42. It is considered that noise including sound in a high frequency region of 1 kHz or more that has entered the sound absorbing member 42 from the plurality of communication ports 40 is less likely to be diffused into the sound absorbing member 42, and the sound absorbing member 42 is difficult to efficiently mute. .

  From the above, in order to sufficiently prevent the user from feeling uncomfortable due to noise including a high frequency region of 1 kHz or higher generated in the suction air passage, the density D1 on the outer lid 35 side of the sound absorbing member 42 and the sound absorbing member 42 are reduced. It is preferable that the density D2 on the inner lid 41 side satisfies the conditions (1) and (2). In order to more sufficiently prevent the user from feeling uncomfortable due to noise including a high frequency region of 1 kHz or higher generated in the suction air passage, the density D1 on the outer lid 35 side of the sound absorbing member 42 and the sound absorbing member 42 are reduced. It is preferable that the density D2 on the inner lid 41 side satisfies the conditions (3) and (4).

Condition (3) 400 ≦ D1 ≦ 800
Condition (4) 0.1 × D1 ≦ D2 ≦ 0.6 × D1
About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the user starts the operation of the vacuum cleaner 100 with the hose 4, the extension pipe 5, and the suction tool 3 connected to the cleaner body 1, suction wind is generated by the electric blower 9 and suction force is generated. . When the user moves the suction tool 3 on the surface to be cleaned in this state, dust on the surface to be cleaned is sucked together with air from the suction tool 3. The air containing dust sucked from the suction tool 3 passes through the suction air passage (not shown) formed by the suction tool 3, the extension pipe 5, and the hose 4 into the cleaner body 1 from the suction port 1 a. And flows in. The air containing dust that has flowed into the cleaner body 1 flows into the dust collector 2.

  At this time, in the suction air path (not shown) from the suction tool 3 to the cleaner body 1 by the suction air generated by the electric blower 9, the inner wall of the extension pipe 5, the suction tool 3 and the extension pipe 5 Friction between the connecting portion (not shown) and the connecting portion (not shown) between the extension pipe 5 and the hose 4 and the suction air may cause noise including a high frequency region of 1 kHz or more. May be uncomfortable.

  In the present embodiment, the sound absorbing member 42 has a density of the sound absorbing member 42 on the inner lid 41 side so that the density on the outer lid 35 side of the sound absorbing member 42 is higher than the density on the inner lid 41 side of the sound absorbing member 42. Therefore, the noise that has entered the sound absorbing member 42 from the plurality of communication ports 40 provided in the inner lid 41 is reduced in the density on the inner lid 41 side. While being diffused in the member 42, the sound pressure is attenuated. Noise that has been muffled in the low-density sound absorbing member 42 on the inner lid 41 side is attenuated by the sound absorbing member 42 as it travels through the sound absorbing member 42 from the inner lid 41 side toward the outer lid 35 side. To go. And the noise which reached | attained the outer cover 35 side is spread | diffused in the high-density sound-absorbing member 42 by the side of the outer cover 35, sound pressure is attenuate | damped, and it is silenced. Thereby, noise generated in the second intake passage 33 of the second tubular body 25 constituting a part of the suction air passage (not shown) can be efficiently diffused into the sound absorbing member 42. Since the sound absorbing member 42 can efficiently mute the sound, the silent performance of the vacuum cleaner 100 can be improved, and the noise generated in the suction air passage (not shown) can be uncomfortable for the user. It can be sufficiently prevented. In the above-described configuration, in particular, to a high frequency region of 1 kHz or more included in the generated noise generated in the second tubular body 25 of the extension pipe 5 constituting a part of the suction air passage (not shown). The silencing effect is remarkable.

  In the present embodiment, a configuration is described in which the sound absorbing member 42 is formed by overlapping a plurality of sound absorbing materials (not shown) so that the density on the outer lid 35 side is higher than the density on the inner lid 41 side. However, the sound absorbing member 42 only needs to be formed so that the density on the outer lid 35 side is higher than the density of the inner lid 41. For example, the density on the outer lid 35 side is higher than the density of the inner lid 41. As such, the sound absorbing member 42 may be formed of one sound absorbing material (not shown) having air permeability. Further, in the case where the sound absorbing member 42 is constituted by a plurality of sound absorbing materials (not shown) having different densities, a plurality of sound absorbing materials (not shown) may be simply overlapped, or a plurality of sound absorbing materials (not shown) may be used. Z) may be integrally formed by an adhesive or heat welding. Further, when the sound absorbing member 42 is formed of at least three sound absorbing materials (not shown) having different densities, the sound absorbing member 42 may be formed such that the density gradually increases from the inner lid 41 side toward the outer lid 35 side. The density between the inner lid 41 side and the outer lid 35 side of the sound absorbing member 42 may be lower than the density of the sound absorbing member 42 on the inner lid 41 side.

  In the present embodiment, the configuration in which the sound absorbing member 42 is disposed in the second cylindrical body 34 of the second tubular body 25 has been described. However, the sound absorbing member 42 is the first tubular body 24 of the first tubular body 24. It may be arranged in the cylinder 27 and may be arranged in both the first cylinder 27 and the second cylinder 34. Thereby, since the noise generated by the suction air flowing in the first tube body 24 and the second tube body 25 can be effectively silenced by the sound absorbing member 42, a part of the suction air passage (not shown) The noise generated in the extension pipe 5 that constitutes can be efficiently silenced by the sound absorbing member 42, the silent performance of the vacuum cleaner 100 can be further improved, and generated in a suction air passage (not shown). It is possible to more sufficiently prevent the user from feeling uncomfortable with the noise.

Further, in the present embodiment, an opening 39 that communicates with the second intake passage 33 and the opening 39 that covers the opening 39 and communicates with the second intake passage 33 at the lower portion of the second cylindrical body 34. A configuration in which an inner lid 41 having a plurality of communication ports 40 and an outer lid 35 covering the opening 39 and the inner lid 41 are provided, and a sound absorbing member 42 is disposed between the outer lid 35 and the inner lid 41 will be described. However, a plurality of communication ports 40 communicating with the second intake passage 33 are formed directly in the lower portion of the second cylindrical body 34, the outer lid 35 is disposed so as to cover the communication ports 40, and the second The structure which arrange | positions the sound absorption member 42 between the some communication port 40 directly formed in the cylindrical body 34 and the outer cover 35 may be sufficient. Thereby, the number of parts of the extension pipe 5 can be reduced, and the assembly property of the extension pipe 5 can be improved.

  In the present embodiment, an opening 39 that communicates with the second intake passage 33 formed inside the second cylinder 34 is provided at the lower part of the second cylinder 34. Although the configuration in which one is provided along the longitudinal direction of 34 and the inner lid 41 is disposed in the opening 39 has been described, the opening 39 is a second intake channel formed inside the second cylinder 34. For example, a plurality of openings 39 may be provided along the longitudinal direction of the second cylindrical body 34. When a plurality of openings 39 are provided along the longitudinal direction of the second cylindrical body 34, the outer lid 35 may be formed for each of the plurality of openings 39, and the plurality of openings 39 It may be formed so as to cover the whole.

  Further, in the present embodiment, the configuration in which the sound absorbing member 42 is disposed in the lower portion of the second cylinder 34 has been described. However, the opening 39, the inner lid 41, and the outer lid 35 are arranged in the second cylinder. The sound absorbing member 42 may be disposed between the outer lid 35 and the inner lid 41, and the sound absorbing member 42 may be disposed above the second cylinder 34.

  Generally, when the user is using the vacuum cleaner 100, the suction air flowing through the extension pipe 5 flows along the upper surfaces inside the first cylinder body 27 and the second cylinder body 34. . Therefore, when the sound absorbing member 42 is arranged on the upper portion of the second cylindrical body 34, the noise generated inside the second cylindrical body 34 can be efficiently silenced by the sound absorbing member 42, and the extension pipe 5 Noise generated inside can be efficiently silenced by the sound absorbing member 42. For this reason, the silent performance of the vacuum cleaner 100 can be improved, and it is possible to sufficiently prevent the user from feeling uncomfortable due to noise generated in the suction air passage (not shown).

  However, generally, the suction air generated by the electric blower 9 contains moisture such as moisture in the air, and the dust on the surface to be cleaned contains moisture such as moisture in the air. . When moisture contained in the suction air and dust is absorbed by the sound absorbing member 42, the noise generated in the second intake flow path 33 formed in the second cylindrical body 34 is diffused into the sound absorbing member 42. There is a case where the sound absorbing member 42 cannot efficiently mute the noise generated by the suction air flowing through the second intake flow path 33 because it is hindered by the moisture absorbed by the sound absorbing member 42. In addition, when moisture is absorbed by the sound absorbing member 42, dust easily adheres to the sound absorbing member 42 due to the absorbed moisture, and noise generated in the second intake flow path 33 is also caused by dust adhering to the sound absorbing member 42. In some cases, diffusion into the sound absorbing member 42 is hindered, and noise generated by the suction air flowing through the second intake passage 33 cannot be effectively silenced by the sound absorbing member 42. Further, since the suction air containing dust flowing in the extension pipe 5 flows along the upper surfaces inside the first cylinder body 27 and the second cylinder body 34, the sound absorbing member 42 is formed above the second cylinder body 34. When the sound absorbing member 42 is disposed, the moisture contained in the suction air and dust is more easily absorbed by the sound absorbing member 42 than in the case where the sound absorbing member 42 is disposed below the second cylinder 34, and the sound absorbing member 42 is silenced. The performance may not be maintained for a long time.

Therefore, the sound absorbing member 42 may be disposed at the upper part of the second cylindrical body 34, but from the viewpoint of maintaining the sound deadening performance of the sound absorbing member 42 for a long period of time, it is disposed at the lower part of the second cylindrical body 34. It is preferable that By disposing the sound absorbing member 42 below the second cylindrical body 34, it is possible to sufficiently prevent the sound absorbing member 42 from absorbing dust and moisture contained in the suction air. The sound absorbing performance can be maintained for a long period of time, and the noise generated by the suction air flowing through the second air intake passage 33 formed in the second cylindrical body 34 can be efficiently silenced by the sound absorbing member 42. This can improve the silent performance of the vacuum cleaner 100.

(Embodiment 2)
Embodiment 2 of the vacuum cleaner of this invention is demonstrated using FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 8 is an overall cross-sectional view at the center in the longitudinal direction of the extension tube in the second embodiment of the vacuum cleaner of the present invention.

  As shown in FIG. 8, in this embodiment, the sound absorbing member 42 is disposed on the inner lid 41 side and the first sound absorbing material 42a, and on the outer lid 35 side. The second sound-absorbing material 42b having a high density is disposed between the first sound-absorbing material 42a and the second sound-absorbing material 42b, and has a higher density than the density of the first sound-absorbing material 42a. And a third sound absorbing material 42c having a density lower than that of the sound absorbing material 42b. A gap 44 is formed between the first sound absorbing material 42a and the third sound absorbing material 42c and between the third sound absorbing material 42c and the second sound absorbing material 42b. Further, a gap 44 is formed in the rib 43 of the outer lid 35 between the first sound absorbing material 42a and the third sound absorbing material 42c and between the third sound absorbing material 42c and the second sound absorbing material 42b. A protrusion 45 extending inward from the rib 43 is formed, and the protrusion 45 is formed between the first sound absorbing material 42a and the third sound absorbing material 42c, and between the third sound absorbing material 42c and the second sound absorbing material 42c. It is formed by being sandwiched between two sound absorbing materials 42b. Furthermore, the width of the gap 44 is preferably 1 to 2 mm.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the user starts the operation of the electric vacuum cleaner 100, a suction wind is generated by the electric blower 9, and a suction force is generated. When the user moves the suction tool 3 on the surface to be cleaned in this state, dust on the surface to be cleaned is sucked together with air from the suction tool 3. The air containing dust sucked from the suction tool 3 passes through the suction air passage (not shown) formed by the suction tool 3, the extension pipe 5, and the hose 4 from the suction port 1a into the cleaner body 1. And flows in. The air containing dust that has flowed into the cleaner body 1 flows into the dust collector 2.

  At this time, in the suction air path (not shown) from the suction tool 3 to the cleaner body 1 by the suction air generated by the electric blower 9, the inner wall of the extension pipe 5, the suction tool 3 and the extension pipe 5 The friction between the connection portion (not shown) and the connection portion (not shown) between the extension pipe 5 and the hose 4 and the suction air may generate noise including a high frequency region of 1 kHz or more. May cause discomfort to the user.

In the present embodiment, the sound absorbing member 42 includes a first sound absorbing material 42a disposed on the inner lid 41 side and a second sound absorbing member 42a disposed on the outer lid 35 side and having a higher density than the first sound absorbing material 42a. The sound-absorbing material 42b is disposed between the first sound-absorbing material 42a and the second sound-absorbing material 42b. The density is higher than the density of the first sound-absorbing material 42a and the density of the second sound-absorbing material 42b. And a third sound-absorbing material 42c having a low density, and a gap 44 is provided between each of the first sound-absorbing material 42a, the third sound-absorbing material 42c, and the second sound-absorbing material 42b. The noise that has entered the sound absorbing member 42 from the communication port 40 is diffused and silenced in the first sound absorbing material 42a, and then a gap provided between the first sound absorbing material 42a and the third sound absorbing material 42c. 44, that is, the air pressure (not shown) is entered, and the sound pressure is Is Decay, noise is silenced. The noise attenuated in the gap 44 provided between the first sound absorbing material 42a and the third sound absorbing material 42c then enters the third sound absorbing material 42c and diffuses in the third sound absorbing material 42c. After the sound is silenced, the sound enters the gap 44 provided between the third sound absorbing material 42c and the second sound absorbing material 42b, and the sound pressure is attenuated and further silenced in the gap 44. Then, the noise attenuated in the gap 44 provided between the third sound absorbing material 42c and the second sound absorbing material 42b is diffused and attenuated in the second sound absorbing material 42b and is silenced.

  Thereby, the noise that has entered the sound absorbing member 42 from the communication port 40 goes from the first sound absorbing material 42a arranged on the inner lid 41 side to the second sound absorbing material 42b arranged on the outer lid 35 side. Accordingly, the noise generated in the second intake passage 33 of the second tubular body 25 constituting a part of the suction air passage (not shown) can be reduced. 42 can be efficiently diffused in the chamber 42 and can be efficiently silenced by the sound absorbing member 42, so that the silent performance of the vacuum cleaner 100 can be improved and generated in a suction air passage (not shown). It is possible to sufficiently prevent the user from feeling uncomfortable due to noise.

  Here, in the present embodiment, the protrusion 45 extending inward from the rib 43 is provided between the first sound absorbing material 42a and the third sound absorbing material 42c, and the third sound absorbing material 42c. Between the first sound absorbing material 42a and the third sound absorbing material 42c, and between the third sound absorbing material 42c and the second sound absorbing material 42b. However, the gaps 44 are formed between the first sound absorbing material 42a and the third sound absorbing material 42c and between the third sound absorbing material 42c and the second sound absorbing material 42b. As a method of forming 44, a needle-like projection (not shown) extending toward the outer lid 35 side is provided on the inner lid 41, and the first sound-absorbing material 42a is provided on the needle-like projection (not shown). And the third sound absorbing material 42c, and between the third sound absorbing material 42c and the second sound absorbing material 42b. As 44 is formed, the first sound absorbing material 42a, third sound absorbing material 42c, and may be held by the second sound absorbing material 42b skewered. Further, a needle-like protrusion (not shown) extends inward from the outer lid 35, and the first sound-absorbing material 42a and the third sound-absorbing material 42c are provided on the needle-like protrusion (not shown). And between the third sound absorbing material 42c and the second sound absorbing material 42b, the first sound absorbing material 42a, the third sound absorbing material 42c, and the second sound absorbing material 42c are formed. The sound absorbing material 42b may be held in a skewered manner.

  In the present embodiment, a gap 44 is formed between the first sound absorbing material 42a and the third sound absorbing material 42c, and between the third sound absorbing material 42c and the second sound absorbing material 42b. Although the configuration has been described, the first sound absorbing material 42a and the third sound absorbing material 42c, and the gap 44 formed between the third sound absorbing material 42c and the second sound absorbing material 42b, A member having a sound absorbing effect may be provided which is made of a material different from the sound absorbing material 42a, the second sound absorbing material 42b, and the third sound absorbing material 42c.

  The vacuum cleaner of the present invention can efficiently mute the noise generated by the suction air flowing inside the extension pipe and can improve the silent performance of the vacuum cleaner. It can be suitably applied to the field and application of a vacuum cleaner and an industrial vacuum cleaner.

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 1a Suction port 2 Dust collector 3 Suction tool 4 Hose 5 Extension pipe 6 Handle part 7 Tip pipe 8 Connection pipe 9 Electric blower 10 Electric blower chamber 11 Dust collector attachment part 12 Wheel 13 Caster 14 Main body handle 15 Collection Dust device body 16 Primary filter 17 Extension portion 18 Secondary filter 19 Upper lid body 20 Lower lid body 21 Dust collector handle 22 Dust removal means 23 Drive means 24 First pipe body 25 Second pipe body 26 First intake air flow Path 27 First cylinder body 28 Upper cover body 28a First cover body 28b Second cover body 28c Through-hole portion 29 Lower cover body 30 Sliding operation portion 30a Engagement projection portion 31 Space portion 32 Insertion port 33 Second Intake channel 34 Second cylinder 35 Outer lid 35a Engaging recess 36 Detachment operation part 37 Sliding support part 38 Cavity part 39 Opening part 40 Communication port 41 inner lid 42 sound absorbing member 43 rib 44 gap 100 electric vacuum cleaner

Claims (5)

  A vacuum cleaner body having a built-in electric blower that generates suction air for sucking dust on the surface to be cleaned, and an extension pipe disposed in a suction air path from the suction air generated by the electric blower to the vacuum cleaner body And the extension pipe has an intake passage that forms a part of the suction air passage inside, and a cylinder having at least one opening, and is attached to the cylinder, An outer lid covering the opening, and a sound absorbing member disposed between the opening and the outer lid, and the sound absorbing member has a density on the outer lid side of the sound absorbing member. Vacuum cleaner that is formed to be higher than.   The vacuum cleaner according to claim 1, wherein the sound absorbing member is formed of a plurality of sound absorbing materials.   The vacuum cleaner according to claim 2, wherein a gap is formed between the plurality of sound absorbing materials.   The vacuum cleaner according to any one of claims 1 to 3, wherein the sound absorbing member is disposed at a lower portion of the cylindrical body.   A rib extending from the inner surface of the outer lid toward the cylindrical body is provided at a position facing the opening of the outer lid, and the sound absorbing member includes the outer lid, the rib, and the opening. The vacuum cleaner of any one of Claims 1-4 arrange | positioned inside the space formed by.