JP2012034759A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner for highly efficiently removing dust attached to a filter with low noise.SOLUTION: The reciprocating drive frequency of a dust removal element 55 is changed by a drive unit 54, so as to allow the respective folds 47 of the filter 40 to resonate at least once or more by the points of the numbers of intrinsic oscillation of each fold. Thus, the dust removal of the filter 40 can be effectively performed with low noise.

Description

  The present invention relates to a vacuum cleaner provided with a filter for filtering dust.

  In the field of electric vacuum cleaners, many methods for removing dust by applying vibration to a filter have been proposed as means for preventing clogging of the filter. For example, a vacuum cleaner provided with dust removing means that vibrates a plurality of claw portions fitted in each of the pleats of a filter having a plurality of pleats formed by bending the cross section into a wave shape has been proposed (for example, the following patents) Reference 1).

  FIG. 8 shows a schematic diagram of a conventional cleaner body described in Patent Document 1. As shown in FIG. FIG. 9 shows a perspective view of the filter device of the conventional vacuum cleaner. As shown in FIGS. 8 and 9, a filter device 111 that supplements dust sucked by the electric blower 110 and a vibrator 112 that vibrates the filter device 111 are provided, and the vibrator is driven before or after the electric blower 110 is driven. 112 is configured to vibrate the filter device 111 to remove dust trapped in the filter device 111.

  The filter device 111 includes a rectangular frame frame 113, a sheet body 116 provided in the frame frame 113 and bent into a wave shape to form a plurality of protrusions 114 and recesses 115, and the vibrator 112 on the sheet body 116. A vibration transmission member 117 that transmits vibration is attached.

  Vibrator 112 is provided with a vibration motor that is driven at a constant rotational speed, and is arranged in parallel with the filter device. The vibration transmission member 117 includes a plurality of claw portions 118 that are fitted in the recesses 115 of the sheet body 116 and a transmission protrusion 119 that directly receives vibration from the vibrator 112.

  The vibration of the vibrator 112 is transmitted from the transmission projection 119 to the vibration transmission member 117, and this vibration is transmitted from the claw portion 118 to the sheet body 116, whereby dust captured by the sheet body 116 can be removed.

JP 2004-121621 A

  However, even the conventional vacuum cleaner described in Patent Document 1 still has room for improvement from the viewpoint of increasing the efficiency of dust removal and reducing noise.

  That is, as described above, in order to efficiently remove dust adhering to the filter device 111 in the vacuum cleaner described in Patent Document 1, it is necessary to vibrate the entire sheet body 116. The vibration is transmitted only to a part of the sheet body 116 via the claw portion 118.

In order to efficiently transmit the vibration of the claw portion 118 to the entire sheet body 116, it is preferable to resonate the sheet body 116, and in order to resonate, the natural frequency of the sheet body 116 and the vibration frequency of the vibrator 112 are made closer. There is a need. However, since the vibrator 112 is driven by a vibration motor having a constant rotational frequency, it is not yet determined whether the vibration 112 matches the natural frequency of the sheet body 116 of the filter device 111. If they happen to match, the sheet body 116 resonates with the vibration of the vibrator 112, greatly vibrating the entire sheet body 116, and dust adhering to the filter device 111 is easily peeled off, so that dust can be efficiently removed.

  However, the natural frequency of the sheet body 116 varies depending on variations in rigidity and weight of the filter material and aging. It also varies depending on the amount and quality of the dust and the moisture. Therefore, the vibration frequency of the vibrator 112 and the natural frequency of the sheet body 116 cannot always be matched.

  In addition, when the sheet body 116 happens to resonate with the vibration of the vibrator 112, the sheet body 116 continues to resonate, so that the entire filter device 111 continuously vibrates violently, causing a problem of noise.

  Further, since the vibrator 112 is supported in parallel with the filter device 111, the vibration of the vibrator 112 vibrates the transmission projection 119 and at the same time vibrates the frame frame 113 as a support portion. Therefore, the vibration energy of the vibrator 112 is diffused not only in the sheet body 116 but also in the entire vacuum cleaner that supports the frame frame 113.

  Further, since vibration from the vibrator 112 is received by the transmission protrusion 119 of the vibration transmission member 117 and the claw portion 118 is vibrated and transmitted to the sheet body 116, vibration until the vibration of the vibrator 112 is transmitted to the sheet body 116 is transmitted. Transmission loss is large and vibration is attenuated.

  Therefore, in order to obtain sufficient dust removal performance by vibrating the sheet body 116, it is necessary to increase the output of the vibration generating source, and the size of the vibrator 112 cannot be avoided.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a vacuum cleaner that removes dust adhering to a filter with low noise and high efficiency.

In order to solve the above-described problems of the prior art, the present invention is an electric blower, a filter having a plurality of pleats having a corrugated cross-sectional shape, and a filter for capturing dust sucked by the electric blower, and attached to the filter. Dust removing means for removing dust, and the dust removing means is reciprocally driven in a direction substantially perpendicular to the ridgeline of the folds, and is moved close to the folds in substantially the same direction as the drive means. A dust remover that transmits vibration to a plurality of pleats;
A vacuum cleaner is provided in which the reciprocating drive frequency of the dust remover is changed by the driving means so as to resonate at least once at the natural frequency of each of the plurality of pleats.

  As described above, since the vacuum cleaner of the present invention changes the reciprocating drive frequency of the dust remover so as to resonate, even if the natural frequencies of each of the plurality of pleats are different, they resonate with each other. be able to. Even if dust adheres to the filter and the natural frequency of the pleats changes, the vibration frequency of the dust remover is changed, so that a point that matches the natural frequency of the pleats can be obtained.

  Thus, since each of the pleats can resonate, the entire pleat vibrates greatly, and dust can be efficiently removed. Further, the resonance of each pleat does not last long because the vibration frequency of the dust remover changes with time, and vibration and noise can be reduced.

In addition, from the viewpoint of obtaining the above-described effect of the present invention more reliably, in the vacuum cleaner of the present invention, the length of the filter is different so that the natural frequency of each of the plurality of pleats is different. It is preferable to configure as described above (claim 2).

  With this configuration, when the vibration frequency of the dust remover is changed, the pleats do not resonate at the same time, so that the resonance is dispersed throughout the filter and noise is reduced. Further, since the vibration energy of the dust remover is also dispersed, the load on the driving means can be reduced, and the driving means can be reduced in size.

  In addition, from the viewpoint of obtaining the above-described effects of the present invention more reliably, in the electric vacuum cleaner of the present invention, the filter may have different rigidity so that the natural frequencies of the plurality of pleats are different. (Claim 3).

  Even with this configuration, when the vibration frequency of the dust remover is changed, the pleats do not resonate at the same time, so that the resonance is dispersed as a whole and noise is reduced. Further, since the vibration energy of the dust remover is also dispersed, the load on the driving means can be reduced, and the driving means can be reduced in size.

  Further, from the viewpoint of configuring the plurality of pleats to have different rigidity, in the electric vacuum cleaner of the present invention, a reinforcing portion (for example, a resin rib) is provided on each of the plurality of pleats of the filter to increase the rigidity. Preferably, the rigidity of the pleats is made different by raising and changing the cross-sectional shape of the reinforcing portion for each pleat (claim 4).

  This configuration reinforces each pleat and simultaneously changes the rigidity of each fold. Therefore, when the vibration frequency of the dust remover is changed as described above, each fold does not resonate at the same time. Resonance is dispersed and noise is reduced. Further, since the vibration energy of the dust remover is also dispersed, the load on the driving means can be reduced, and the driving means can be reduced in size.

  Further, from the viewpoint of obtaining the above-described effect of the present invention more reliably, in the electric vacuum cleaner of the present invention, the driving means has a natural frequency that each of the plurality of pleats has a reciprocating drive frequency of the dust remover. It is preferable to change at least one reciprocation within a range including this point.

  With this configuration, each fold can be resonated at least twice in a change in the vibration frequency of the dust remover. As a result, the dust that could not be removed by one resonance is reliably removed, and the frequency and amplitude changes of the pleat vibration are repeated in this way, so that the vibrations adapt to various particles and fibers adhering to the filter. Can be included, and dust is easily peeled off.

  Moreover, from the viewpoint of obtaining the above-described effects of the present invention more reliably, the electric vacuum cleaner of the present invention preferably includes elastic means for transmitting the reciprocating drive of the drive means to the dust remover via an elastic body. (Claim 6).

  By transmitting the drive of the drive means to the dust remover via the elastic means, a resonance condition is established mainly from the spring constant of the elastic means and the weight of the dust remover. When the frequency of the drive means is brought close to this resonance frequency, the dust remover Can be increased in amplitude. Therefore, the filter provided in the vicinity of the dust remover vibrates greatly, and dust can be efficiently removed. In addition, since the reciprocating drive of the drive means is transmitted to the dust remover via the elastic body, no collision sound is generated between the drive means and the dust remover.

Therefore, this invention can provide the vacuum cleaner which removes the dust adhering to a filter with low noise and high efficiency.

  According to the present invention, it is possible to provide a vacuum cleaner that removes dust adhering to a filter with low noise and high efficiency.

Overall view of the electric vacuum cleaner according to Embodiment 1 of the present invention Sectional drawing which shows the structure of the main part of the vacuum cleaner The perspective view which shows the filter and dust removal means of the same vacuum cleaner (A) Front view of filter and dust removing means of the vacuum cleaner, (b) AA sectional view of the filter and dust removing means, (c) BB sectional view of the filter and dust removing means. Time variation characteristics diagram of the dust cleaner stroke of the vacuum cleaner Time variation characteristics diagram of vibration frequency of dust cleaner of the vacuum cleaner The fragmentary sectional view of the filter and dust removal means of the vacuum cleaner in Embodiment 2 of this invention Schematic diagram that closes the configuration of the main parts of a conventional vacuum cleaner The perspective view of the filter apparatus of the conventional vacuum cleaner

  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)
1 is an external perspective view showing a first embodiment of a vacuum cleaner of the present invention, FIG. 2 is a cross-sectional view showing the configuration of the main part of the vacuum cleaner, and FIG. 3 is a filter and dust removing means of the vacuum cleaner. 4 (a) is a front view of the filter and dust removing means of the vacuum cleaner, FIG. 4 (b) is an AA sectional view of the filter and dust removing means, and FIG. 4 (c) is the filter. It is a BB sectional view of dust removal means.

  As shown in FIG. 1, wheels 3 and casters 4 are attached to the outside of the cleaner body 1, and the cleaner body 1 can freely move on the floor surface. A suction hose 7 and an extension pipe 8 are sequentially connected to a suction port 6 provided below the installation part of the dust collection case 5, and a suction tool 9 is attached to the tip of the extension pipe 8.

  As shown in FIG. 2, an electric blower 21 is built in the vacuum cleaner main body 1, and a dust collection case 5 is disposed on the upstream side of the electric blower 21 through a partition wall 26 having a vent 22. Is detachably installed. Then, by operating the electric blower 21, dust on the floor surface of the house can be sucked, and the dust collecting case 5 introduces air containing the sucked dust, centrifuges and deposits the dust, and Filter out fine dust. The filtered air is exhausted from an exhaust outlet (not shown) downstream of the electric blower 21 (a cyclonic vacuum cleaner).

  The dust collection case 5 includes a hollow cylindrical dust collection box 31 having a lower intake port 30 and a dust collection lid 33 having an upper exhaust port 32. The dust collection case 5 is attached to the cleaner body 1. In the mounted state, the intake port 30 communicates with the suction port 6, and the exhaust port 32 communicates with the vent port 22.

The dust collection box 31 is provided with a middle case 34 in which hollow cylinders and hollow cones having different diameters are stacked in multiple stages. The middle case 34 includes a filter housing case 35, an inclined cylinder A36, and a primary cylinder in order from the top. The filter 37, the inclined cylinder B38, and the fine dust cylinder 39 are connected in series.

  The filter housing case 35 contains the filter 40 inside, and the outer periphery is housed along the upper end of the inner surface of the dust collection box 31. The outer surface of the filter housing case 35 and the inner surface of the dust collection box 31 are sealed members (not shown). It is arranged so as to close the gap.

  The inclined cylinder A36 has a hollow conical shape. When the dust captured by the filter 40 is removed, the dust falling from the filter 40 is transferred to the primary filter 37, the inclined cylinder B38, and the fine dust cylinder 39. A slope for guiding is constructed inside.

  The primary filter 37 has a cylindrical shape having minute through-holes on the entire surface, and allows air to pass from the outer periphery of the cylinder to the inside of the cylinder to generate relatively large dust (coarse dust, hair, hair, etc.) Dust).

  The inclined cylinder B38 has a hollow conical shape like the inclined cylinder A36, and has an inclined surface for guiding dust falling from the filter 40 to the fine dust cylinder 39 inside. The fine dust cylinder 39 has a cylindrical shape and stores dust guided from the inclined cylinder B38. On the bottom inner surface of the dust collection box 31, a packing 41 is provided for sealing between the bottom of the fine dust cylinder 39.

  The intake port 30 is opened so that the suction airflow flows in the tangential direction of the inner surface of the dust collection box 31. Then, the suction airflow finally turns while rotating the flow path formed by the gap between the outer surface of each of the inclined cylinder A36, the primary filter 37, the inclined cylinder B38, and the fine dust cylinder 39 and the inner surface of the dust collection box 31. Is sucked into the cylinder by the primary filter 37 and flows toward the filter 40.

  Dust in the suction airflow that flows into the dust collection box 31 from the intake port 30 moves to the lower part of the dust collection box 31 while rotating so as to be pressed against the inner surface of the dust collection box 31 by centrifugal force, and is thus collected in the dust collection box. 31 is accumulated at the bottom. The lower part of the primary filter 37 is provided with a collar part 42 so that the accumulated dust does not rise. That is, the lower part of the collar part 42 is a dust collecting part, and the upper part is a centrifugal separation part.

  Further, the bottom of the dust collection box 31 is provided with an openable / closable bottom lid 43. When the dust accumulated in the dust collection box 31 is discarded, the bottom lid 43 can be opened and easily discarded. . Further, since the bottom of the fine dust cylinder 39 is also opened, the dust accumulated therein can be discarded at the same time.

  On the other hand, dust (fine dust) such as fine dust, pollen, and mite droppings, which are difficult to be centrifuged, remains partly entangled with coarse dust deposited on the bottom of the dust collection box 31 and partly 1 along with the air flow. Next, it passes through the filter 37 and flows to the filter 40, filtered by the filter 40 and deposited while adhering to the surface of the filter 40.

  The dust collection lid 33 has a cylindrical shape and is airtightly attached to the upper part of the dust collection box 31. Inside, dust removing means 45 for removing dust adhering to the filter 40 by vibration is housed, and an electrical component (not shown) is housed in the inner lid 46.

Electrical components (not shown) include a printed circuit board, a power supply terminal, a charging component, a motor driver element, an on / off switch, and the like. Electricity is stored in the charging component from the vacuum cleaner body 1 through the power supply terminal. It is driven by the power from The drive control of the dust removing means 45 is driven by one of an instruction from a microcomputer (not shown) in the cleaner body 1 and an instruction from an on / off switch (not shown) of the dust collecting lid 33.

  Thus, the dust removing means 45 is configured to operate even when the power outlet (not shown) is pulled out or the dust collecting case 5 is removed by the function of the charging component.

  Next, details of the filter 40 and the dust removing means 45 will be described with reference to FIGS. 3, 4 (a), 4 (b), and 4 (c).

  As shown in FIGS. 3 and 4, dust removing means 45 is arranged in parallel to the filter 40 on the downstream side (upper part) of the disk-shaped filter 40.

  As the filter 40, a non-woven fabric, pulp, glass fiber, HEPA filter, or the like can be used. In the first embodiment, a filter membrane obtained by laminating a filter membrane in which a PTFE membrane excellent in dust separation properties is laminated on a non-woven fabric is folded. The body 50 is integrally formed with resin inside the cylindrical frame 51. The pleats 47 formed by the film body 50 are configured to have different lengths because the ridge line direction is regulated by the frame body 51.

  The dust removing means 45 includes a drive means 54 having a restricting portion 53 that converts the rotation of the electric motor 52 into a reciprocating linear drive, a dust remover 55 arranged so as to be orthogonal to the ridge line of the fold 47 of the filter 40, and a drive means 54. Is constituted by elastic means 56 that transmits the reciprocating drive to the dust remover 55 via two compression springs (56).

  The dust remover 55 has a plurality of claw portions 58 disposed in the valleys of the pleats 47 of the filter 40 below the rectangular rod-shaped bone portion 57 disposed in the driving direction, and is configured in the longitudinal direction of the upper center. A groove portion 59 is provided, and a guide blade portion 60 is provided before and after the bone portion 57. And the dust remover 55 is movable along the rail 61 by fitting the guide blade part 60 in the rail 61 arrange | positioned at the both sides of the bone part 57 so that sliding is possible.

  The rail 61 is supported by the inner lid 46 shown in FIG. 2, and both ends thereof also have a function of pressing and fixing the frame body 51 of the filter 40 from above. The support portion 62 of the electric motor 52 is also integrally formed with the rail 61 and supported by the inner lid 46.

  The restricting portion 53 includes an eccentric cam 62 fixed to the shaft center of the electric motor 52 and a movable element 63 that inverts the eccentric cam 62 and converts the rotation into a reciprocating drive. The movable element 63 has one end. Is slidably disposed in the groove portion 59 of the dust remover 55, and the guide pins 64 arranged in the front-rear movable direction are slidably fitted into the guide holes 65 formed at both ends of the groove portion 59 of the dust remover 55. Is.

  The two compression springs that are the elastic means 56 are metal compression coil springs that are biased so as to sandwich the mover 63 in the groove 59, and expand and contract when the mover 63 is driven in the groove 59. The movement is transmitted to the dust remover 55 through the compression spring. The difference between the set length of the compression spring and the compression length, that is, the allowable deformation amount of the spring is desirably set larger than the reciprocating stroke of the mover 63. This is to prevent the electric motor 52 from being locked and damaging the motor windings when the dust remover 55 stops moving due to some trouble.

  When the electric motor 52 is operated in the above configuration, the eccentric cam 62 rotates, so that the movable element 63 is grooved with a stroke (for example, 2 mm) double the eccentric amount (for example, 1 mm) of the electric motor 52 and the eccentric cam 62. Reciprocating along 59. The compression spring expands and contracts with the movement of the movable element 63, and a difference is generated between the urging forces of the two compression springs on the dust removal element 55, and the dust removal element 55 is driven along the rail 61. Then, the claw portion 58 of the dust remover 55 contacts the side surface of the pleat 47 of the filter 40 to vibrate the pleat 47.

  At this time, the dust remover 55 and the mover 63 move in the same linear direction, and the compression spring expands and contracts in the same direction. Further, since the driving direction of the claw portion 58 is arranged orthogonal to the pleat 47 of the filter 40, the pleat 47 can be vibrated efficiently.

  A gap is formed between the claw portion 58 of the dust remover 55 and the pleat 47 of the filter 40. This gap is an important condition in order that the dust remover 55 can move freely and the filter 40 does not hinder the resonance of the dust remover 55. In the present embodiment, about 80% (for example, 0.8 mm) of ½ of the reciprocating stroke of the mover 63 is set as the gap. The gap can resonate with the dust remover 55 even at 20% to 150% of ½ of the reciprocating stroke of the mover 63, and the dust removal effect of the filter 40 can be enhanced. % Is desirable.

  This gap not only improves the resonance condition of the dust remover 55, but when the claw portion 58 contacts the fold 47, the inertia force of the dust remover 55 generated by this gap acts on the fold 47 and is strong against the fold 47. Vibration can be generated and dust removal performance can be further enhanced.

  Next, the dust removal operation will be described with reference to FIGS. 5 and 6. FIG. 5 is a time variation characteristic diagram of the stroke of the dust remover of the vacuum cleaner, and FIG. 6 is a time variation characteristic diagram of the vibration frequency of the dust remover of the vacuum cleaner.

  As shown in FIG. 5, the stroke 70 of the reciprocating drive of the dust remover 55 operates in a sinusoidal manner with a stroke that is approximately twice the eccentric amount of the electric motor 52 and the eccentric cam 62 in the same cycle as the driving means 54. In the present embodiment, operation control is performed so that the drive cycle Tf of the drive means 54 changes with time. Therefore, the vibration cycle of the dust remover 55 also changes in conjunction.

  However, the phase shifts by the expansion and contraction of the compression spring which is the elastic means 56. With respect to the amplitude, the resonance condition is established by providing the compression spring, and the stroke of the dust remover 55 is increased by driving with a period close to the resonance frequency.

  The vibration frequency of the dust remover 55 is changed with time as shown in FIG. That is, the control of the drive frequency of the electric motor 52 that vibrates the dust remover 55 is set as shown in FIG.

  In FIG. 6, the dust remover 55 is started at the frequency F0 at time T0, and the vibration frequency is increased until the frequency F1 is reached at time T1. Then, during the period from time T1 to time T2, the vibration frequency is lowered again from the frequency F1 to the frequency F0, and thereafter this operation is repeated twice. Then, at time T3, the electric motor 52 is stopped and the dust removal operation is terminated.

  The dust removal start time T0 is activated based on the end of suction when the electric blower 21 of the vacuum cleaner is stopped, or on the operation start operation signal of the user.

  The range from the frequency F0 to the frequency F1 is set wider than the range of the natural frequency 71 of each pleat 47 of the filter 40. Therefore, when the vibration frequency 72 of the dust remover 55 changes and the vibration frequency 72 of the dust remover 55 approaches and passes through the natural frequency 71 of each of the pleats 47, the corresponding fold 47 is resonated. 47 can vibrate greatly and the dust adhering to the filter membrane can be peeled off and efficiently removed.

Since the pleats 47 have different lengths in the ridge line direction as described above, the pleats 4
The natural frequencies at which the ridge line 7 vibrates like a string are different. In this way, by configuring each natural frequency to be different, changing the vibration frequency of the dust remover, and resonating each pleat at different timings, the resonance vibration is dispersed, so noise can be reduced.

  In addition, since the resonance timing passes in a short time together with the change in the vibration frequency of the dust remover, not only the noise is reduced, but also the durability due to the resonance of the filter and the dust removing means is improved.

  As mentioned above, although the dust removal means of 1st Embodiment in the electric vacuum cleaner of this invention was demonstrated, the vacuum cleaner of this invention is not limited to the change pattern of the vibration frequency of the dust remover of 1st Embodiment mentioned above. .

  For example, the number of changes in the vibration frequency may be one, or may be repeated five times and ten times, and the same effect can be obtained if the filter folds resonate due to the vibration of the dust remover.

  Further, the change waveform of the vibration frequency of the dust remover may be a sawtooth shape, a sine wave shape, or a staircase shape. Further, the changing speed may be changed in accordance with the density of the natural frequency of the folds.

  Moreover, although the electric motor and the eccentric cam are used as the driving means of the first embodiment in the electric vacuum cleaner of the present invention, a linear reciprocating driving means such as a linear motor may be used.

  Furthermore, although the metal compression spring is used as the elastic means of the first embodiment of the electric vacuum cleaner of the present invention, it may be a resin spring or an air spring such as a bellows or a piston / cylinder filled with gas. .

  Moreover, although the restriction | limiting part of 1st Embodiment in the electric vacuum cleaner of this invention was comprised so that rotation of an electric motor might be converted into reciprocating drive by the needle | mover which inclined the eccentric cam, rotation of an electric motor is comprised. Alternatively, the movable element may be moved by being converted into a reciprocating motion by the crankshaft and the connecting rod.

(Embodiment 2)
Next, the dust remover used for the vacuum cleaner according to Embodiment 2 of the present invention will be described in detail with reference to the drawings. FIG. 7 is a partial cross-sectional view of the filter and dust removing means of the vacuum cleaner. In addition, the same part as Embodiment 1 mentioned above attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIG. 7, the difference from the first embodiment is that resin ribs 81 as reinforcing portions are provided on the ridges of the folds 47 of the filter 40. The rib 81 is formed by molding integrally with the filter membrane 50 in order to reinforce the filter membrane 50 of the filter 40. Therefore, not only can the damage of the filter membrane 50 due to the collision of the claw portion 58 of the dust remover 55 be reduced, but the rigidity of the entire filter 40 is increased and the strength is increased.

  In the second embodiment, the rib 81 is configured by changing the height for each pleat 47. The rigidity of each pleat 47 changes due to the difference in height, and the natural frequency of the pleat 47 can be changed due to the change in rigidity. In the first and second embodiments, the filter 40 has a cylindrical shape, and the natural frequency is changed by changing the length of the pleats 47. However, the natural frequency can also be changed by changing the rigidity depending on the cross-sectional shape of the rib 81. Can be changed. Therefore, for example, even if the length of the pleat 47 is the same, the natural frequency can be changed for each pleat 47 by changing the shape of the rib 81, so that the degree of freedom in design is improved. In addition, an arbitrary natural frequency can be set to some extent.

Since each pleat 47 has a different natural frequency as described above, when the vibration frequency of the dust remover 55 is changed to vibrate, the timing of the resonant vibration of each pleat 47 changes and the resonant vibration is dispersed. Noise can be reduced.

  In this way, it is possible to achieve both a powerful dust removal action by resonance and a reduction in noise.

  In the second embodiment, the height of the rib 81 is changed to change the rigidity, but the width, the groove is formed, the groove shape is changed, or the space shape is changed by changing the groove shape. The rigidity may be changed by, for example.

  Further, the difference from the first embodiment is that the elastic means 80 is constituted by a rubber member (80) disposed in a gap in the groove 59. The elastic means 80 is two rubber rectangular parallelepipeds, and is arranged so as to sandwich the mover 63 in the groove 59. When the mover 63 is driven in the groove 59, the elastic means 80 expands and contracts via the elastic means 80. The movement is transmitted to the child 55.

  A polymer material such as rubber has both a spring property and a damper property that damps vibration. By making the elastic means 80 rubber, the amplitude peak at the resonance frequency becomes gentle. Therefore, as compared with the spring, the amplitude peak is reduced, but the resonance frequency region is expanded, so that the frequency setting range is widened and the degree of freedom in design is increased. Further, since the rubber itself expands and contracts, the rubber can be arranged in a narrow gap, and the degree of freedom of arrangement increases.

  In the second embodiment, rubber is used as the material of the elastic means, but a flexible material such as elastomer or foamed resin may be used. In the second embodiment, two elastic means are used. However, a structure in which a mover is arranged in the center of a single elastic means may be used.

  The electric vacuum cleaner of the present invention can be used for various vacuum cleaners because the dust adhering to the filter can be removed by vibrating with the dust removing means.

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 21,110 Electric blower 40 Filter 45 Dust removal means 47 Fold 54 Drive means 55 Dust remover 56, 80 Elastic means 58, 118 Claw part 81 Reinforcement part (rib)

Claims (6)

An electric blower,
A filter having a plurality of corrugated cross-sectional shapes to capture dust sucked by the electric blower;
A dust removing means for removing dust adhering to the filter;
The dust removing means includes
Driving means for reciprocating in a direction substantially orthogonal to the ridgeline of the folds;
A dust remover that is close to the pleats and moves in substantially the same direction as the drive means and transmits vibrations to the pleats;
Change the reciprocating drive frequency of the dust remover by the drive means,
A vacuum cleaner that resonates at least once at a point of a natural frequency of each of the plurality of pleats. The vacuum cleaner according to claim 1, wherein each of the filters has a different length so that each of the plurality of pleats has a different natural frequency. The vacuum cleaner according to claim 1, wherein each of the plurality of pleats has a different rigidity so that each of the plurality of pleats has a different natural frequency. 4. The filter according to claim 3, wherein each of the plurality of pleats is provided with a reinforcing portion to increase rigidity, and the cross-sectional shape of the reinforcing portion is changed for each pleat so that the rigidity of the pleats is different. Electric vacuum cleaner. The said drive means changes the reciprocating drive frequency of the said dust remover at least 1 reciprocation within the range including the point of the natural frequency which each of these pleats has. Electric vacuum cleaner. The vacuum cleaner of any one of Claims 1-5 provided with the elastic means which transmits the reciprocating drive of the said drive means to the said dust remover via an elastic body.