JP5825325B2 - Silencer structure of vacuum cleaner - Google Patents

Description

  The present invention relates to a silencer structure for a vacuum cleaner.

  Conventional vacuum cleaners have been proposed in which a silencer is installed in the vicinity of the suction brush for the purpose of silencing the sound generated by the fluid sucked from the suction brush in contact with the floor surface. (For example, refer to Patent Documents 1 and 2).

JP 2013-63117 A Japanese Patent No. 4879238

  The vacuum cleaner sucks outside air into the main body of the vacuum cleaner from the suction brush via a straight pipe and a bellows-shaped hose, and collects dust contained in the outside air. In the above conventional technique, the sound of the fluid component generated at the time of suction is silenced by a silencer structure installed in the vicinity of the suction brush.

  However, the noise generated by the vacuum cleaner is emitted from the suction brush through the bellows-like hose and the straight pipe, for example, generated in the main body of the vacuum cleaner in addition to the sound (sound wave) at the time of suction. Main body sound (sound wave) exists. The main body sound radiated from this suction tool has become a problem as noise of the vacuum cleaner, and it was not possible to reduce the noise of the vacuum cleaner including the main body sound only by the silencer structure provided near the suction brush. .

  This invention was made in order to solve the above-mentioned subject, and provides the silencer structure of the vacuum cleaner which can reduce the suction sound which is a noise source of a vacuum cleaner, and the cleaner main body sound exactly. With the goal.

The silencer structure of the electric vacuum cleaner according to the present invention comprises a pipe line comprising a straight pipe having one end connected to the suction port, and a bellows-like hose connecting the other end of the pipe and the main body of the vacuum cleaner. A vacuum cleaner equipped with an expansion chamber provided with a sound-absorbing material in an internal space communicating with the pipe line through a plurality of openings, and the expansion chamber is a traveling wave that propagates inside the pipe line A position where the sound pressure mode of the standing wave becomes an antinode, and a first connection part which is a connection part between the suction port and the pipe, a second connection part which is a connection part between the pipe and the hose, and a hose Are arranged in pairs at two or more of the third connecting portions which are connecting portions between the main body and the cleaner body.

  According to this invention, the noise of a vacuum cleaner can be reduced with a simple configuration.

It is a side view which shows the external appearance of the vacuum cleaner in Embodiment 1 of this invention. It is a figure which shows the example of an analysis result of the sound field characteristic inside the attachment (pipeline) in the state of the vacuum cleaner shown in FIG. It is a figure which shows the example of standing wave (sound pressure) mode according to the conditions in a pipe line. It is basic explanatory drawing of the well-known expansion chamber G, and is a figure for demonstrating an expansion type silencing structure. It is a figure which shows the side cross section of the expansion chamber A. FIG. It is a figure which shows the longitudinal cross-section of the expansion chamber A. FIG. It is a figure which shows the example of a state of the opening surface of the opening for sound wave entrance. It is a figure which shows the sound absorption characteristic of a sound-absorbing material. It is a figure which shows the noise reduction effect by the silencing structure of the vacuum cleaner of embodiment of this invention. It is a side view which shows the external appearance of the vacuum cleaner in Embodiment 2 of this invention. It is a side view which shows the external appearance at the time of removing a pipe part in the vacuum cleaner shown in FIG. It is a side view which shows the external appearance of the vacuum cleaner in Embodiment 3 of this invention. It is a side view which shows the external appearance of the vacuum cleaner in Embodiment 4 of this invention. It is a figure which shows the side cross section of the expansion chamber A. FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description thereof will be simplified or omitted as appropriate.

Embodiment 1 FIG.
FIG. 1 is a side view showing the appearance of the electric vacuum cleaner according to Embodiment 1 of the present invention.

  As shown in FIG. 1, an attachment 2 is connected to the vacuum cleaner main body 1. The attachment 2 includes a suction brush tool 3 as a suction port body, a cylindrical pipe portion 4 having a circular or elliptical cross section, and a hose portion 5 formed in a bellows state. It is the basic form of Attachment 2.

  A handle portion 6 is formed at the end of the pipe portion 4 or the hose portion 5 for the operation of the electric vacuum cleaner and the operation of the attachment 2 itself when the user performs cleaning. In addition, in the vacuum cleaner shown in FIG. 1, although the handle part 6 is comprised as a handle overhanging from the cylinder part which comprises the pipe part 4 or the hose part 5, depending on a model, the end of the pipe part 4 or the hose part 5 is comprised. In some cases, the operation switches for operating the vacuum cleaner are embedded in a part of the part, and the part also serves as a handle. In any case, the vicinity of the connection portion between the pipe portion 4 and the hose portion 5 acts as a handle, and the majority of users of the vacuum cleaner grasp the portion that can be the handle portion. Clean. Furthermore, in the electric vacuum cleaner of the present embodiment, the expansion chamber A10 and the expansion chamber B12 are arranged in the middle of the attachment 2 constituting the pipe line. The arrangement and configuration of the extension room A10 and the extension room B12 will be described later.

  In addition, when the user of the vacuum cleaner actually uses the vacuum cleaner, as shown in FIG. 1, the positional relationship of each component constituting the attachment 2 with the handle 6 as a boundary is in an inverted V-shaped state. It is common to become. From this, it is assumed that the attachment 2 is in an inverted V-shape in most of the actual vacuum cleaner usage time.

  FIG. 2 is a diagram showing an example of the analysis result of the sound field characteristics inside the attachment (pipe) in the state of the vacuum cleaner shown in FIG. The solid line in FIG. 2 represents the standing wave characteristics at the end of the pipe. Specifically, the connecting portion between the hose portion 5 and the vacuum cleaner body 1 (hereinafter, this portion is referred to as “third connecting portion”). The frequency characteristics in the sound field. 2 is a standing wave characteristic at a connection portion between the hose portion 5 and the pipe portion 4 in the pipeline (hereinafter, this portion is referred to as “second connection portion”). 6 is a frequency characteristic of a sound field in the vicinity of the unit 6. Furthermore, the one-point short broken line in FIG. 2 is the frequency characteristic of the sound field at the connection portion between the pipe portion 4 and the suction brush tool 3 (hereinafter, this portion is referred to as “first connection portion”). Note that when the actual vacuum cleaner is used, the suction brush tool 3 is in contact with the floor surface, and the state on the suction brush tool 3 side is in contact with the floor surface even during measurement in FIG. State.

  Here, in the measurement result of FIG. 2, there are frequencies at which the peak frequency responses (corresponding to the sound pressure level) of the solid line, the one-point long broken line, and the one-point short broken line in the figure coincide. For example, the peak frequency component in the vicinity of 100 Hz shows a characteristic tendency in which the response of the solid line and the one-point short broken line match. This is because the “acoustic energy” generated at the end portion (third connection portion) of the hose portion 5 propagates in the pipe line of the attachment 2 and the pipe portion 4 to which the suction brush tool 3 is connected. It is shown that sound is emitted as the same response at the end portion (first connection portion). In other words, the acoustic energy generated in the electric vacuum cleaner main body 1 indicates that air is propagated to the suction brush tool 3 without being attenuated in the middle of propagating in the pipe.

  FIG. 2 shows that a peak frequency coincidence near 500 Hz, which indicates that sound is emitted as a maximum sound pressure level even near 500 Hz, occurs between the solid line and each one-dot broken line. That is, the frequency component in the vicinity of 500 Hz of the acoustic energy generated in the vacuum cleaner body 1 has a maximum sound pressure level at the connection portion (second connection portion) between the hose portion 5 and the pipe portion 4. This phenomenon indicates that the sound is radiated by propagating to the end portion (first connection portion) of the pipe portion 4 to which the suction brush tool 3 is joined.

  That is, the noise generated in the vacuum cleaner main body 1 propagates through the inside of the attachment 2. At this time, the standing wave which is the acoustic characteristic in the pipe line of the attachment 2 is influenced, and the acoustic energy travels as a traveling wave in the attachment 2, and the final attachment 2 is not caused without any particular attenuation of the acoustic energy. “Sound” of the vacuum cleaner main body 1 is radiated from the suction brush tool 3 which is an outlet. In addition, the junction part (2nd connection part) of this hose part 5 and the pipe part 4 corresponds with the vicinity (namely, vertex part of an inverted V shape) of the handle part 6. FIG.

  FIG. 3 is a diagram showing an example of standing wave (sound pressure) mode for each condition in the pipeline. As shown in this figure, the state of the sound pressure mode propagating in the pipeline differs depending on the end condition of the pipeline. Considering the frequency characteristics of the standing wave in FIG. 2 and the actual usage state of the vacuum cleaner, it can be assumed that the sound pressure mode in the attachment 2 of the vacuum cleaner is “both ends closed tube”. That is, it can be assumed that the vacuum cleaner main body 1 side of the pipe line by the attachment 2 is closed by the “main body” and the suction brush tool 3 side in contact with the floor surface is “closed”. In addition, this pipe closing phenomenon also occurs in the handle portion 6 in the actual use state. That is, the state of the handle portion 6 (vertical V-shaped apex portion) forms a “closed circuit” phenomenon of the pipe line, and as a result, the response of the two sound pressure levels matches as a maximum value. Will be produced.

  Therefore, the acoustic energy generated in the vacuum cleaner main body 1 propagates through the inside of the pipe line in the attachment 2 and also takes into account the closing phenomenon at the handle portion 6 in the actual use state. It can be confirmed that the air propagates to the end of the pipe portion 4 to which 3 is connected.

  The vacuum cleaner of the present embodiment is provided with an expansion chamber A10 and an expansion chamber B12 as means corresponding to the acoustic phenomenon in the pipe line described above. Hereinafter, the arrangement and configuration of the expansion chamber A10 and the expansion chamber B12 which are the main parts of the present invention will be described in detail. An expansion chamber A <b> 10 is configured on the vicinity side (first connection portion) of the suction brush tool 3 that is one of the end portions of the pipe portion 4. Further, an expansion chamber B12 is configured in the vicinity of the connecting portion (second connecting portion) between the pipe portion 4 and the hose portion 5. Each expansion chamber A, B has an arbitrary diameter and an arbitrary longitudinal dimension. In the vacuum cleaner of the present embodiment, the silencer is configured as a set of acoustic conduits A by the two expansion chambers A10 and B12.

  The expansion chamber A10 and the expansion chamber B12 have the internal structure of the cross-sectional views shown in FIGS. FIG. 4 is a basic explanatory view of a known expansion room G, and is a view for explaining an expansion type silencing structure. In FIG. 4, So represents the cross-sectional area of the inlet and outlet pipes of the expansion chamber G13, Si represents the cross-sectional area of the expansion chamber G13, and L represents the longitudinal dimension of the expansion chamber G13.

  The effect of noise reduction can be calculated using the cross-sectional areas So and Si. The dimension L of the expansion chamber G13 is such that a silencing effect can be exhibited when at least 1/4 (that is, λ / 4) of the wavelength λ of the frequency to be silenced is incident. As shown in FIG. 3, the sound pressure mode in the pipe has a dense wave state depending on the state of the pipe end. Therefore, depending on the end state, there are traveling waves and reflected waves of sound waves in the pipeline, but especially in the actual usage state of a vacuum cleaner, if the surface state where the traveling wave arrives is a rigid wall The traveling wave is assumed to be reflected by the rigid wall.

  Referring to the frequency characteristics in FIG. 2, the difference in frequency peak and dip is affected by reflection, but the phenomenon of acoustic energy consumption due to collision with a rigid wall occurs, so there is little consideration of reflected waves. Good. However, the standing wave due to the traveling wave has a frequency band in which a frequency peak dip occurs at a constant order but the sound pressure level is not attenuated. This is an attachment state (inverted V-shaped state) derived from the actual use state of the vacuum cleaner, and the joint portion (second connection portion) between the pipe portion 4 and the hose portion 5 is necessarily in a bent state. Yes. For this reason, the sound wave traveling in the pipeline is reflected by the inverted V-shaped portion, and as a result, there are a plurality of acoustic pipelines (that is, a plurality of closed ends). Therefore, it is necessary to take a measure for surely reducing the frequency-sound pressure level in each acoustic pipe section. In the vacuum cleaner of the present embodiment shown in FIG. 1, countermeasures against acoustic energy generated in the pipe line are provided by providing two sets of expansion chambers at both ends of one pipe line (acoustic pipe line A). Can be done.

  The expansion chamber A10 and the expansion chamber B12 of the present embodiment use the basic structure of the expansion chamber G13 shown in FIG. 4, but are ideal in consideration of the actual usage state of the vacuum cleaner. It is difficult to construct an expansion chamber having a large structural dimension because discomfort to the operation of the vacuum cleaner accompanying an increase in the size and weight of the attachment occurs.

  FIG. 5 is a view showing a side cross section of the expansion chamber A10, and FIG. 6 is a view showing a vertical cross section of the expansion chamber A10. Note that the internal configuration of the expansion chamber B12 is the same as that of the expansion chamber A10. Therefore, in the following description, the internal configuration will be described using the expansion chamber A10 as an example. The expansion chamber A10 includes a pipe inner wall 26 in which a plurality of sound wave entrance openings 30 are formed, a cylindrical outermost surface 19 that covers the outer periphery of the sound wave entrance opening 30 of the pipe inner wall 26, and an outermost surface 19 The outer wall is constituted by the space wall 18 that closes the gap between the end face and the pipe inner wall 26. Here, the length of the outermost peripheral surface 19 in the axial direction (expansion chamber length) is L, and the height from the outermost peripheral surface 19 to the pipe inner wall 26 is H. Inside the expansion chamber A, an expansion chamber space 20 is formed between the pipe inner wall 26 and the outermost peripheral surface 19. A sound absorbing material 22 is disposed in the expansion chamber space 20. A plurality of air chamber securing ribs 21 of about 5 mm are provided on the inner wall surface of the outermost peripheral surface 19, and the tips of the air chamber securing ribs 21 are in contact with the sound absorbing material 22. Thereby, an air chamber 25 which is a space of at least about 5 mm in height is formed between the sound absorbing material 22 and the inner wall of the outermost peripheral surface 19. Note that the pipe inner wall 26 may be configured as a part of a pipe line of the attachment 2 in which the expansion chamber is disposed.

  The sound wave entrance opening 30 has one opening diameter of φ3 or more, and a plurality of opening diameters are randomly arranged. Further, the edge of each opening is deleted by the corner R or C surface, and there is no sharp surface. The sound wave entrance opening 30 is provided so that the aperture ratio is 50% or more. When the aperture ratio is 50% or less, a filter effect that prevents the incidence of sound appears, and an acoustic phenomenon that sharply attenuates the sound pressure level in a certain frequency band is exhibited by causing a known Helmholtz operation. That is, the sound wave that is spatially propagated in the pipe portion 4 can surely enter the expansion chamber A10.

  FIG. 7 is a diagram illustrating a state example of the opening surface of the sound wave entrance opening 30. In this figure, (A) shows a case where a plurality of the opening diameters φ3 (denoted by φA) are formed at regular intervals, (B) shows a case where the opening diameters φ3 are formed in a staggered arrangement, and (C) shows the above-mentioned case (D) shows a case where the opening shape is a shape other than a circle (rectangular shape), and (E) is a case where it is formed in a staggered arrangement including an opening larger than the opening diameter φ3 (for example, φ5 (described by φB)). ) Shows the case where the opening shape is a honeycomb shape. In any shape, each opening has a diameter of R5 or more and the edge of the end is removed. This is because the opening surface (the pipe inner wall 26) is exposed inside the attachment 2, so that the edge turbulent sound generated due to the flow velocity in the attachment 2 is not generated.

  In addition, the dimension of the expansion chamber length L can be made into the dimension for reducing the frequency of 100 Hz obtained by the measurement result of the standing wave of FIG. In this case, similarly to the basic configuration of the expansion chamber G16 described with reference to FIG. 4, the expansion chamber A10 must be configured to have a dimension L that allows incidence of λ / 4 of 100 Hz, and the dimension L at that time is approximately 43 cm. (Sound velocity 350 m / S: when the temperature in the pipe line is 30 ° C.). However, providing such an extension chamber with an ideal extension chamber length L (43 cm) in the attachment may cause difficult conditions in the actual use state of the vacuum cleaner. Therefore, in such a case, the expansion chamber space 20 as much as possible is formed and applied to the sound energy attenuation by the sound absorbing performance of the sound absorbing material 22. In the present embodiment, since the air chamber 25 which is an air layer is formed around the sound absorbing material 22 in the expansion chamber space 20, the sound absorption rate as the sound absorbing material can be further enhanced.

In addition, the sound absorbing material 22 of the present embodiment uses pulp fibers cut to a fiber length of 10 mm or less and a fiber diameter of 1 mm or less as a main raw material. Then, an arbitrary amount of an inorganic material such as carbon or silicon is kneaded into the main raw material pulp fiber to provide flame retardancy and non-flammability characteristics corresponding to UL standards. In addition, since the size or weight of the home appliance is closely related to the purchase conditions of the product user, the sound absorbing material 22 needs to be sufficiently light and thin, and has sufficient sound absorption characteristics even if it is light and thin. There is a need. Therefore, the thickness of the sound absorbing material 22 of the present embodiment is about 10 mm, and the basis weight is 500 g / m ² or more.

  In addition, the sound absorbing material 22 of the present embodiment is combined or singly kneaded with a fungicide, an antiseptic, an antibacterial agent, or the like. That is, when the vacuum cleaner is actually used, it is assumed that not only dry garbage but also moist garbage (including food) or water droplets spilled on the floor surface are sucked. At this time, if moisture adheres to the sound absorbing material 22 installed in the expansion chamber space 20, there is a concern about generation of “mold” or the like. In this respect, since the above-mentioned mold agent is kneaded in the sound absorbing material 22 of the present embodiment, even if a situation in which dust or water droplets containing moisture etc. are accidentally sucked from the suction port, Corrosion due to generation and deterioration is effectively suppressed.

  A thin film of 100 microns or less made of pulp or resin material may be fixed on the surface of the sound absorbing material 22. This is for using acoustic vibration energy conversion using the natural vibration of the film material fixed to the surface, and can exhibit a large sound pressure level damping effect for a specific frequency band. The configuration of the sound absorbing material 22 is not limited to the above configuration, and a suitable material or the like can be selected without departing from the scope of the present invention.

  FIG. 8 is a diagram showing the sound absorption characteristics of the sound absorbing material. In addition, the one-point long broken line in FIG. 8 is a sound absorption when a resin fiber such as PP or PET, a nonwoven fabric made of a general fiber such as cotton, or a foamed resin material such as urethane is applied as a general conventional sound absorbing material. The characteristics are shown. Sound absorbing materials made of these materials are generally installed in ready-made vacuum cleaners and the like. Further, the solid line in FIG. 8 is the sound absorption characteristic of the sound absorbing material 22 mounted in the embodiment of the present invention, and shows the sound absorption characteristic when using a non-woven sound absorbing material made mainly of pulp fibers. ing. Further, the one-point short dashed line in FIG. 8 shows the sound absorption characteristics of the composite sound absorbing material in which a thin film of 100 microns or less is fixed to the material of the sound absorbing material 22 of the present embodiment shown by the solid line. The thickness of the sound absorbing material is 15 mm for the conventional sound absorbing material and 10 mm for the others. As shown in this figure, it can be seen that the sound absorbing material 22 mounted in the embodiment of the present invention has higher sound absorbing characteristics than those using conventional materials. For this reason, even if it is an expansion room where it is difficult to constitute an ideal expansion room space, it is possible to exhibit an attenuation effect of an acoustic level equivalent to that when an expansion room having an ideal size is mounted.

  FIG. 9 is a diagram showing a noise reduction effect by the sound deadening structure of the electric vacuum cleaner according to the embodiment of the present invention. In addition, this figure is an example of the analysis result in the measurement in the vicinity of the suction brush tool 3, and the one point long broken line in the figure shows the frequency characteristic of the noise of the vacuum cleaner before the countermeasure which does not mount the expansion chamber. Yes. In addition, the solid line in the figure is a frequency characteristic indicating a noise reduction effect when two pairs of the expansion chamber A10 and the expansion chamber B12 are mounted on the attachment 2.

  When looking at the trend of frequency characteristics in FIG. 9, noise reduction of 20 dB or more at maximum in a wide band from around 200 Hz to around 8000 Hz by mounting two sets of expansion chambers A and B each equipped with a sound absorbing material 22 on the attachment 2. It turns out that the effect was acquired. From this result, it can be seen that noise from the vicinity of 100 Hz, which is a problem in the standing wave measurement shown in FIG. 2, to the high frequency band due to the sound absorbing material effect can be reliably reduced.

  In addition, the one-point short broken line in FIG. 9 has shown the frequency characteristic in case the number of the expansion chambers mounted in the attachment 2 is only one. In the case of the “both ends closed tube” shown in FIG. 3, sound “antinodes” portions are generated at both ends. As described above, the actual use state of the vacuum cleaner is assumed to be “both ends closed tube”, but when the expansion chamber of the present invention is mounted only at one end of the end, the sound pressure level is higher than when mounted at both ends. It can be seen that the attenuation effect is less than half. This means that, when a single expansion chamber is mounted, the sound pressure level attenuation effect can be obtained only at one end of the “abdomen = dense” portion with respect to the sound pressure mode of the sound wave propagating in the attachment 2. It is shown that.

Embodiment 2. FIG.
FIG. 10 is a side view showing the appearance of the electric vacuum cleaner according to Embodiment 2 of the present invention. In the embodiment shown in this figure, the expansion chamber A10 and the expansion chamber B12 are mounted on both ends of the hose portion 5, that is, the second connection portion and the third connection portion. This corresponds to a case where the influence of the standing wave on the hose portion 5 side is large, or a case where the electric vacuum cleaner is used with the pipe portion 4 removed. FIG. 11 is a side view showing an external appearance when the pipe portion is removed from the electric vacuum cleaner shown in FIG. 10. In the embodiment shown in this figure, the pipe portion 4 is removed from the hose portion 5 and a tapered suction tool 40 is connected. As the usage state of the electric vacuum cleaner as shown in this figure, for example, a case where simple cleaning is performed without using the pipe portion 4 or a case where dust such as a sash is sucked is assumed. Under such a use situation where the pipe portion 4 is not provided, the hose portion 5 is approximated to a substantially straight state, so that the standing wave in the hose portion 5 affects the noise. Therefore, according to the silencing structure of the electric vacuum cleaner of the second embodiment, it is possible to reduce noise targeting noise caused by standing waves in the hose portion 5.

Embodiment 3.
FIG. 12 is a side view showing the appearance of the electric vacuum cleaner according to Embodiment 3 of the present invention. In the embodiment shown in this figure, A10 and the expansion chamber B12 are mounted on both ends of the attachment 2, that is, the first connection portion and the third connection portion. According to such a configuration, in order to cope with the noise of the order frequency of the low frequency component of the power source frequency component (50 Hz, 60 Hz) generated by the blower motor (not shown) of the vacuum cleaner main body 1, the noise is generated in the entire attachment 2. This is effective when taking countermeasures.

Embodiment 4 FIG.
FIG. 13 is a side view showing the appearance of the electric vacuum cleaner according to Embodiment 4 of the present invention. The example shown in this figure is an implementation means that combines the first embodiment and the second embodiment described above. The first connecting portion, the second connecting portion, and the third connecting portion include the extension chamber A10 and the extension chamber B12. And an expansion chamber C50. According to such a configuration, the acoustic conduit configuration is (1) acoustic conduit A at both ends of the pipe portion 4 and (2) acoustic conduit B at both ends of the hose portion 5. It is possible to take measures against sound waves propagating in the road. Thereby, the sound attenuation effect in the whole attachment 2 can be obtained.

Embodiment 5 FIG.
Pulp-based sound-absorbing material, which is a natural material, contains the “odor” of the pulp itself and naturally emits the scent of wood. Therefore, in the sound deadening structure of the electric vacuum cleaner in the fifth embodiment, the scent of pulp from the expansion chamber A10 to the external space using the sound absorbing material 22 made mainly of pulp fibers that have not been degreased with pulp-specific odors. Is supposed to diverge. FIG. 14 is a view showing a side cross section of the expansion chamber A10. In the expansion chamber A10 shown in this figure, a plurality of openings 60 having an opening diameter of φ3 or more provided with a mesh-like filter 55 are provided at arbitrary positions on the outermost peripheral surface 19. According to such a configuration, the smell of the pulp diverges from the opening 60, which contributes to improving the comfort of the space. Further, based on the Bernoulli theorem, an effect of sucking in floating dust drifting from the opening 60 to the outside air environment can also be expected. In addition, the configuration of the expansion chamber A10 described above can be applied to the expansion chamber B12.

  According to the embodiment described above, the expansion chamber space in which the acoustic energy propagating in the attachment 2 enters the “antinode = dense” position in the sound pressure mode of the standing wave of the traveling wave propagating in the attachment 2. 20 and the sound absorbing material 22 installed in the expansion chamber space 20 are installed in both ends of each component of the attachment 2 as a set of two expansion chambers, so that the suction brush tool propagates through the attachment 2 The noise of the vacuum cleaner main body 1 radiating from 3 can be attenuated accurately.

  In the present embodiment, the passive countermeasure means is used at the antinode (= dense) position of the sound pressure mode associated with the acoustic characteristics of the noise. For this reason, since the weight reduction of the apparatus which performs noise reduction, cost reduction, and stabilization of control are implement | achieved, the reliability with respect to the noise reduction of a long period is maintained.

[Others]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the following modifications may be adopted.

  If these two are used as a set, the extension room A10 and the extension room B12 can be mounted on a vacuum cleaner that has already been sold, and the noise frequency characteristic reduction effect equivalent to that of the present invention can be obtained. Therefore, the expansion chamber A10 and the expansion chamber B12 can also supply optional products.

  Further, in the above-described embodiment, the longitudinal cross-sectional shape of the expansion chamber A10 (expansion chamber B12) is substantially cylindrical. However, if the aperture ratio of the sound wave entrance opening 30 can be secured by 50% or more. The same effect can be exhibited even in the appearance other than the cylinder.

  Moreover, in the above-mentioned embodiment, although the example of mounting expansion room A10 (expansion room B12) to the attachment of a vacuum cleaner was shown, you may attach to the air conditioner etc. which provided the duct.

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body, 2 Attachment (pipe line), 3 Suction brush tool (suction inlet body), 4 Pipe part, 5 Hose part, 6 Handle part, 10 Expansion room A, 12 Expansion room B, 13 Expansion room G, 18 space wall, 19 outermost peripheral surface (outer peripheral surface), 20 expansion chamber space, 21 air chamber securing rib, 22 sound absorbing material, 25 space (air chamber), 26 pipe inner wall (inner peripheral surface), 30 for sound wave entry Opening, 40 Suction tool, 50 Expansion chamber C, 55 Filter, 60 Opening

Claims (12)

A silencer structure for a vacuum cleaner comprising a straight pipe having one end connected to a suction port, and a bellows-like hose connecting the other end of the pipe and the vacuum cleaner body, ,
An expansion chamber provided with a sound absorbing material in an internal space communicating with the pipe line through a plurality of openings;
The expansion chamber is a position where the sound pressure mode of the standing wave of the traveling wave propagating inside the pipe line becomes an antinode, and a first connection portion that is a connection portion between the suction port body and the pipe Two or more of the second connection part, which is a connection part between the pipe and the hose, and the third connection part, which is a connection part between the hose and the cleaner body, are arranged in pairs. muffling structure of the electric vacuum cleaner comprising been.   2. The silencer structure of a vacuum cleaner according to claim 1, wherein the expansion chamber is provided in the first connection portion and the second connection portion.   The silencer structure of a vacuum cleaner according to claim 1, wherein the expansion chamber is provided in the second connection portion and the third connection portion.   The silencer structure of the vacuum cleaner according to claim 1, wherein the expansion chamber is provided in the first connection portion and the third connection portion.   The silencer structure of a vacuum cleaner according to claim 1, wherein the expansion chamber is provided in the first connection portion, the second connection portion, and the third connection portion. The expansion chamber is
An inner peripheral surface in which the opening is formed;
An outer peripheral surface covering the periphery of the inner peripheral surface,
The vacuum cleaner according to any one of claims 1 to 5, wherein a plurality of air chamber securing ribs for forming an air chamber between the outer peripheral surface and the sound absorbing material are formed. Silence structure.   The sound absorbing material according to any one of claims 1 to 6, wherein the main material is pulp fiber cut to a fiber length of 10 mm or less and a fiber diameter of 1 mm or less, and an inorganic material is kneaded. Silencer structure of the vacuum cleaner.   The sound-absorbing material according to any one of claims 1 to 7, wherein the sound-absorbing material is kneaded with a fungicide, a preservative, or an antibacterial agent.   The sound-absorbing structure for a vacuum cleaner according to any one of claims 1 to 8, wherein the sound-absorbing material is formed by adhering a thin film of 100 microns or less made of a pulp or resin material to the surface. The expansion chamber is
An inner peripheral surface in which the opening is formed;
An outer peripheral surface covering the periphery of the inner peripheral surface,
The opening has an opening area of φ3 or more, and a plurality of opening diameters are randomly arranged. Each opening diameter section has a chamfered surface of R5 or more, and the opening ratio of the opening with respect to the inner peripheral surface is 50. The sound deadening structure for a vacuum cleaner according to any one of claims 1 to 9, wherein the structure is configured to be at least%. The expansion chamber is
An inner peripheral surface in which the opening is formed;
An outer peripheral surface covering the periphery of the inner peripheral surface,
The sound absorbing structure for a vacuum cleaner according to any one of claims 1 to 10, wherein the outer peripheral surface includes a plurality of opening surfaces each having an opening diameter of φ3 or more provided with a mesh-like filter.   The sound-absorbing material according to claim 11, wherein the sound-absorbing material is made of pulp fibers that have not been degreased with pulp-specific odors.

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