JP4767293B2 - Vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner, and more particularly to a vacuum cleaner provided with a dust removing device that removes dust and the like attached to a filter.

  As is well known, an electric vacuum cleaner captures dust or the like sucked together with air with a filter provided on the downstream side of the dust collection chamber of the vacuum cleaner body, and most of the dust collection chamber (including a dust collection box and the like). It is dropped inside and clean air that has passed through the filter is discharged to the outside.

  However, the filter is clogged by dust or the like that is captured and adhered to the filter, and not only the suction force by the electric blower is reduced, but also the load of the electric blower is increased and extra power is consumed. For this reason, a dust removal device has been proposed in which vibration and impact are applied to the filter while it is installed in the main body of the cleaner, and dust or the like adhering to the filter is dropped.

  In a conventional vacuum cleaner dust remover, the linear reciprocating motion of the solenoid body provided on the vibration unit collides with the rib provided on the filter member to vibrate the filter member, so that dust attached to the filter member is dropped. (For example, refer to Patent Document 1).

  The filter is driven by a first dust removing means that rotates in conjunction with the cord reel and applies vibration by hitting the filter, and a rotating body provided in the first dust removing means. There has been proposed a vacuum cleaner that includes a second dust removing means that strikes and vibrates, thereby removing dust adhering to the filter (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2007-111504 (page 7-9, FIGS. 1, 2 and 4) Japanese Patent Laid-Open No. 2008-385 (pages 4, 5 and 3.6)

  The dust removing device of Patent Document 1 has a small excitation force (acceleration) and displacement applied to the filter by the linear reciprocating motion of the solenoid body. Therefore, even if dust attached to the surface of the filter member can be removed, the filter There was a problem that the fine dust contained up to the surface layer could not be removed sufficiently.

  In addition, the dust removing means of the cited document 2 applies vibration to the filter by rotational force, and in order to obtain a large excitation force, the rotational speed is changed or the direction of movement is changed by a gear mechanism or a cam. There must be. For this reason, there are problems that the structure is complicated, the number of parts is large, the cost is high, and the operation noise is increased due to the backlash of the gear mechanism.

  The present invention has been made in order to solve the above-mentioned problems, and has a simple structure, improves the dust removal performance of the filter, reduces the number of parts, reduces the cost, and further reduces the operation noise. An object of the present invention is to provide an electric vacuum cleaner equipped with a dust removing device.

The vacuum cleaner according to the present invention includes a dust collection chamber provided on the upstream side of the interior, an electric blower installed via a partition wall on the downstream side of the dust collection chamber, and a filter disposed on the upstream side of the partition wall. And a vacuum cleaner body having a dust removing device having a drive unit that applies dust or vibration to the filter from the downstream side to remove dust and the like attached to the filter, and the impact or vibration by the drive unit of the dust remover Is a multiple of 2 or more of the natural frequency of the filter.

  According to the present invention, dust or the like adhering to the surface of the filter, of course, has entered the surface layer by causing the filter to strike and resonate with the filter at an integer multiple of the natural frequency of the filter or in the vicinity thereof by the dust removing means. Since the fine dust is also removed, the filter can be reliably cleaned with a simple structure, the suction power of the vacuum cleaner can be increased, and the power consumption can be suppressed.

[Embodiment 1]
1 is a central longitudinal sectional view of a vacuum cleaner main body from which a part of the electric vacuum cleaner according to Embodiment 1 of the present invention is omitted, FIG. 2 is a longitudinal sectional view of the same main part, and FIG. 3 is an explanation of the filter of FIG. 4 and 4 are perspective views showing the overall configuration of the vacuum cleaner. In the following description, the left side of the figure is referred to as the front side or the upstream side, and the right side is referred to as the rear side or the downstream side.

  As shown in FIG. 4, the electric vacuum cleaner according to the present embodiment is detachably connected to the vacuum cleaner main body 1 and one end of the vacuum cleaner main body 1 through the suction port 5, and the hand handle 31 is provided at the other end. A hose 30 and an extension pipe 32 having one end detachably connected to the hand handle 31 and a floor suction tool 33 detachably connected to the other end.

  As shown in FIGS. 1 and 2, the vacuum cleaner main body 1 is partitioned by a partition wall 2 having an opening 3 at a substantially central portion in the front-rear direction, and a suction port is provided at the front end on the front side. A dust collection chamber 4 having 5 is provided, and an electric blower chamber 6 in which an electric blower 7 is installed facing the opening 3 is provided on the rear side.

  A dust collection box 8 communicating with the suction port 5 is detachably accommodated in the dust collection chamber 4. A pleated filter 9 as shown in FIG. The crease 9a is attached integrally with the vertical direction. Further, on the upstream side of the opening 3 of the partition wall 2, for example, when the filter 9 is not installed or the filter 9 is damaged, the backup filter 10 held by the frame 10 a is installed. ing.

Reference numeral 11 denotes a dust removing device installed on the rear side of the partition wall 2 at the lower side of the electric blower 7 (one side in the width direction of the cleaner body 1), and its details are shown in FIG.
In FIG. 5, reference numeral 12 denotes a solenoid that constitutes the dust removing device 11, an excitation coil 14 wound around a bobbin 13, a plunger 15 that is a drive unit housed in a central hole of the bobbin 13 so as to be capable of reciprocating in the axial direction, The yoke 16 and the yoke lid 17 that cover the coil 14, the stopper 18 that restricts the movable range when the plunger 15 moves forward, the movable range when the plunger 15 moves backward, and the operation sound when the plunger 15 operates. The front soundproof rubber 19a and the rear soundproof rubber 19b are reduced.

Reference numeral 20 denotes a bush having an approximately M-shaped cross section made of an elastic material such as rubber. The bush 20 is attached to an opening 2a provided on the partition wall 2 corresponding to the plunger 15, and abuts against the tip of the plunger 15 to be attached thereto. While covering, airtightness between the dust collection chamber 4 and the electric blower chamber 6 is ensured.
Reference numeral 21 denotes a dust remover which is rotatably provided on the partition wall 2 by a shaft 22 provided at the lower end portion, and has a length substantially equal to the width direction of the filter 9. It is provided in the lower part, is always urged toward the partition wall 2 by a spring (not shown), and is in contact with the bush 20.

The excitation coil 14 of the solenoid 12 of the dust removing device 11 configured as described above is applied with a pulse voltage (repetition of energization and de-energization) from the dust removal control unit 25 to repeat excitation and de-excitation, and the plunger 15 is pivoted. Reciprocate in the direction. The frequency of the pulse voltage at this time is set to be an integer multiple of the natural frequency f ₀ of the filter 9 or the vicinity thereof.

For example, the filter 9 has a pleated shape made of a PET non-woven fabric, the thickness t = 0.3 mm, the height H = 15 mm of the fold 9a, the width L = 108 mm, the number of peaks (folds) N = 36, and the length A = 140 mm. When the end portion is insert-formed with ABS resin, the natural frequency f ₀ of the filter 9 is about 40 Hz. Therefore, the frequency of the pulse voltage applied to the exciting coil 14 of the solenoid 12 is f ₀ × n = 40 ×. nHz (n is an integer, for example, 1 to 5).

Next, the operation of the dust removing device 11 configured as described above will be described with reference to FIGS. 5 shows a state when the solenoid 12 is not energized, and FIG. 6 shows a state when the solenoid 12 is energized.
When a pulse voltage having an integer multiple of the natural frequency f ₀ of the filter 9 or a frequency in the vicinity thereof is applied from the dust removal control unit 25 to the excitation coil 14 of the solenoid 12, a magnetic field is formed by the excitation coil 14 when energized. As shown in FIG. 6, the plunger 15 is sucked in the direction of the arrow, moves in the axial direction, its tip protrudes from the opening 2a, and stops by hitting the stopper 18. At this time, the bush 20 is pressed and deformed by the plunger 15, the dust remover 21 in contact with the bush 20 is rotated toward the filter 9 against the spring, and its tip collides with the filter 9. Give a blow to.

  When the energization of the exciting coil 14 is de-energized, the attracting force in the forward direction of the plunger 15 is lost, so that the dust remover 21 is biased by the spring and moves away from the filter 9 as shown in FIG. The plunger 15 is rotated to the side of the partition wall 2 and the plunger 15 is pushed back (retracted) through the bush 20 in the direction of the arrow, and when the tip end is located substantially in the opening 2a, the front soundproof rubber 19a is stopped. At this time, the dust remover 21 is separated from the filter 9, and its tip is located on the rear side (partition wall 2 side) of the frame 10 a of the backup filter 10.

In this manner, by applying a pulse voltage having a frequency that is an integral multiple of the natural frequency f ₀ of the filter 9 or a frequency in the vicinity thereof to the excitation coil 14 of the solenoid 12, the solenoid 15 corresponds to the frequency of the applied pulse voltage. Then, the reciprocation of the forward and backward movements is repeated, and each time the forward movement is made, the filter 9 is struck by hitting, and the filter 9 is vibrated.

Next, operation | movement of the vacuum cleaner which concerns on this Embodiment comprised as mentioned above is demonstrated.
In FIG. 4, when an unillustrated power cord is connected to a commercial power source, and the floor suction tool 33 is positioned on the floor surface and the power switch provided on the hand handle 31 is turned on, the electric blower 7 provided on the cleaner body 1 is turned on. Is driven. Thereby, air containing dust and the like is sucked from the floor suction tool 33 and is sucked into the dust collection box 8 in the cleaner body 1 through the extension pipe 32, the hand handle 31 and the hose 30.

  Of the air containing dust or the like sucked into the dust collection box 8, relatively large dust falls on the filter 9 and falls in the dust collection box 8, and fine dust is captured by the filter 9 and the backup filter 10. The purified air cools the electric blower 7, the control unit (not shown), and the like, and is then discharged to the outside from an exhaust port (not shown) provided at the rear.

When the power switch is turned off after the cleaning is completed, the electric blower 7 stops. At this time, a pulse voltage is applied from the dust removal control unit 25 to the solenoid 12 of the dust removal device 11. As a result, the plunger 15 repeats forward and backward reciprocating motions at an integer multiple of the natural frequency f ₀ of the filter 9 or a period (frequency) in the vicinity thereof, and strikes the filter 9 via the dust remover 21 to resonate. Then, the filter 9 is largely deformed and dust and the like adhering to the surface thereof are separated from the filter 9 as well as fine dust entering the surface layer and dropped into the dust collection box 8 to clean the filter 9.

When a predetermined time (for example, 5 to 10 seconds) elapses, the dust removal control unit 25 stops energization of the solenoid 12. Thereby, the dust removal apparatus 11 returns to the state of FIG.
In the above description, when cleaning is completed, a pulse voltage is automatically applied from the dust removal control unit 25 to the solenoid 12 to activate the dust removal device 11 to remove dust and the like and clean the filter 9. However, the filter 9 may be cleaned by energizing the dust removing device 11 appropriately from the dust removing control unit 25 manually.

  When the dust collection box 8 is filled with dust or the like, the upper cover (not shown) provided on the upper surface of the dust collection chamber 4 is opened, and the dust collection box 8 is pulled up integrally with the filter 9 and taken out. Dust and the like are discarded and accommodated in the dust collection chamber 4 again, and the upper lid is closed. At this time, the dust remover 21 of the dust remover 11 is rotated by being biased by a spring, and its tip is located on the partition 2 side from the frame 10 a of the backup filter 10. 8 can be attached and detached vertically without being interfered by the dust remover 21.

According to the present embodiment configured as described above, the dust removing means 11 causes the filter 9 to strike and resonate at an integer multiple of the natural frequency f ₀ of the filter 9 or at a period in the vicinity thereof. 9 is greatly deformed so that not only dust adhering to the surface of the filter 9 but also fine dust entering the surface layer is separated from the filter 9 and dropped into the dust collection box 8. Thus, the filter 9 can be reliably cleaned in a short time, and thereby the suction force of the electric vacuum cleaner can be increased.

In addition, since the spring provided on the dust remover 21 serves both to urge the dust remover 21 toward the partition wall 2 and to retract the plunger 15 when the pulse signal is not energized, the structure is simple and the number of parts is reduced. This can reduce costs.
Furthermore, since the front soundproof rubber 19a and the rear soundproof rubber 19b are provided before and after the plunger 15 in the axial direction, it is possible to reduce the operation sound during the operation of the plunger 15.

[Embodiment 2]
FIG. 7 is a longitudinal cross-sectional view of the main part of the cleaner body from which a part of the electric vacuum cleaner according to Embodiment 2 of the present invention is omitted. In addition, the same code | symbol is attached | subjected to the part of the structure similar to Embodiment 1, or the same function.
In the present embodiment, the operation control unit 26 controls the power supplied to the electric blower 7. Further, the clogging detection unit 27 detects the load applied to the electric motor of the electric blower 7, that is, the clogged state of the filter 9 by detecting the current value of the electric power supplied to the electric blower 7. Further, the dust removal control unit 25 stores a plurality of data of the natural frequency f ₁ corresponding to the clogged state of the filter 9 in advance as a table.

In the present embodiment as described above, as described above, the electric blower 7 is driven to suck air containing dust and the like by the floor suction tool 33, and dust is collected from the dust collection box 8 by the filter 9 and the backup filter 10. Clean air from which etc. are removed is discharged outside.
During this time, the clogging detection unit 27 detects a load applied to the electric motor of the electric blower 7 constantly or appropriately.

When cleaning is completed, the clogging detection unit 27 sends information related to the motor load state of the electric blower 7 to the dust removal control unit 25, and the dust removal control unit 25 reads this information from the table stored based on this information. The natural frequency f ₁ of the filter 9 corresponding to the clogging is calculated. Then, a pulse voltage having an integer multiple of the natural frequency f ₁ , that is, a frequency of f ₁ × n or the vicinity thereof is applied to the excitation coil 14 of the solenoid 12.

Even in the present embodiment, substantially the same effect can be obtained by substantially the same operation as in the first embodiment, but further, an integer multiple of the natural frequency f ₁ of the filter 9 in the clogged state or the vicinity thereof. Since the pulse voltage having the frequency of? Is applied to the solenoid 12, dust or the like adhering to the filter 9 can be more reliably removed.

[Embodiment 3]
FIG. 8 is a longitudinal cross-sectional view of the main part of the cleaner body from which a part of the electric vacuum cleaner according to Embodiment 3 of the present invention is omitted. In addition, in the case of the structure similar to Embodiment 1, 2, or the same function, the same code | symbol is attached | subjected.
In the present embodiment, the natural frequency f ₀ when the filter 9 is not clogged is set in the dust removal control unit 25 in the second embodiment in advance, and the natural frequency corresponding to the clogged state of the filter 9 is set. A table of a plurality of data of the frequency f is stored.

When cleaning is completed, the clogging detection unit 27 sends information related to the load state of the electric blower 7 to the dust removal control unit 25, and the dust removal control unit 25 filters the clogging from the table based on this information. 9 natural frequency f ₁ is calculated.
Then, the dust removal control unit 25 is an integral multiple of the average value of the natural frequency f ₀ of the filter 9 in the clogged state and the natural frequency f ₁ in the clogged state, that is, (f ₀ + f _1). ) ÷ 2 × n or a pulse voltage having a frequency in the vicinity thereof is applied to the exciting coil 14 of the solenoid 12.
The operation and effect of the present embodiment are almost the same as those of the second embodiment.

  In the above description, the case where the present invention is implemented in the illustrated vacuum cleaner is shown. However, the present invention is not limited to this, and the present invention can also be implemented in vacuum cleaners having other structures.

It is a center longitudinal cross-sectional view of the vacuum cleaner main body which abbreviate | omitted some vacuum cleaners which concern on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the principal part of FIG. It is explanatory drawing of the filter of FIG. It is a perspective view showing the whole vacuum cleaner composition concerning the present invention. It is a structure and action explanatory drawing of the dust removal apparatus of FIG. It is a structure and action explanatory drawing of the dust removal apparatus of FIG. It is a longitudinal cross-sectional view of the principal part of the cleaner main body which abbreviate | omitted some vacuum cleaners which concern on Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the principal part of the cleaner body which abbreviate | omitted a part of electric vacuum cleaner which concerns on Embodiment 3 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body, 2 Bulkhead, 4 Dust collection chamber, 5 Suction port, 7 Electric blower, 8 Dust collection box, 9 Filter, 10 Backup filter, 11 Dust removal device, 12 Solenoid, 14 Excitation coil, 15 Plunger, 18 Stopper , 19a Front soundproof rubber, 19b Rear soundproof rubber, 20 bushing, 21 dust remover, 25 dust removal control unit, 26 operation control unit, 27 clogging detection unit.

Claims (8)

A dust collection chamber provided on the upstream side of the interior, an electric blower installed via a partition wall on the downstream side of the dust collection chamber, a filter disposed on the upstream side of the partition wall, and hitting the filter from the downstream side Or having a vacuum cleaner body equipped with a dust removing device having a drive unit for removing dust attached to the filter by applying vibrations,
An electric vacuum cleaner characterized in that a period of striking or vibrating by the drive unit of the dust removing device is an integer multiple of 2 or more of the natural frequency of the filter.   The vacuum cleaner according to claim 1, further comprising a dust removal control unit that stores a natural frequency of the filter and controls a period of striking or vibration of the drive unit of the dust removal device. The natural frequency of the filter in the clogged state of the filter is stored, and a dust removal control unit that controls the period of striking or vibration of the drive unit of the dust removing device, and clogging detection that detects the clogged state of the filter And the dust removal control unit drives the drive unit at a cycle of an integer multiple of 2 or more of the natural frequency of the filter corresponding to the detection information of the clogging detection unit. The electric vacuum cleaner according to claim 1. 4. The electric device according to claim 3, wherein the drive unit is driven at a cycle of an integer multiple of 2 or more of an average value of the natural frequency of the filter and the natural frequency corresponding to the clogged state of the filter. Vacuum cleaner.   The drive unit of the dust remover is configured to be able to protrude from the opening provided in the partition to the filter side, and a dust remover biased to the partition side is provided between the drive unit and the filter. The vacuum cleaner according to any one of claims 1 to 4, wherein the vacuum cleaner is provided.   6. The electric cleaning according to claim 5, comprising a bush made of an elastic material, which is attached to an opening provided in the partition wall, covers a front end portion of the driving unit of the dust removing device, and contacts the dust removing element. Machine.   The drive unit of the dust removing device is configured by a movable part of a solenoid that moves forward in the filter direction when energized, and the movable part is moved forward or backward by applying a pulse voltage to the solenoid. ~ 6 vacuum cleaner.   8. The electric vacuum cleaner according to claim 7, wherein the solenoid is provided with a stopper for restricting the advance range of the movable part when energized, and a stopper for restricting the retreat range of the movable part when energized.

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