JP2012120582A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector in which an automatic dusting function can be added with a simple structure and in which increase in cost and scale can be suppressed.SOLUTION: The dust collector 1 has a main filter 12 and a prefilter 13 interposed between a suction port 10 and an intake unit 4. A body 3 is provided with a resonance plate 18 that resonates during a motor operation and that has a maximum amplitude at the resonance revolution of the motor. The motor is operated with the resonance revolution during the performance of a delay function after the operation switch 7 is turned off, thereby amplifying vibration during the operation of the motor and enabling the vibration to be transmitted to the main filter 12 and the prefilter 13.

Description

  The present invention relates to a dust collector in which a main body having an intake unit including a motor and a suction fan is placed above a tank having a suction port, and a filter is interposed between the suction port and the main body in the tank.

A dust collector is known in which a main body having an intake unit having a motor and a suction fan is placed above a tank having a suction port, and a filter is interposed between the suction port and the main body in the tank. ing. That is, when the suction fan is rotated by driving the motor, the outside air is sucked into the tank through the hose connected to the suction port, and is sucked into the tank together with the outside air by being discharged outside through the intake unit. Dust is captured by a filter and collected in a tank.
In such a dust collector, since the suction force decreases when the filter is clogged with dust attached to the filter, an automatic dust removal mechanism that automatically removes dust attached to the filter at the end of operation is added. Things are also known. As this automatic dust removal mechanism, Patent Documents 1 and 2 include a dust remover such as a brush that can rotate along a filter and a motor that rotates the dust remover, and a negative pressure generated on the downstream side of the filter at the end of operation. An invention is disclosed in which a switch provided in a dust removal circuit is operated and a motor is operated for a certain period of time so as to perform automatic dust removal by a dust remover.

Japanese Utility Model Publication No. 52-55881 Japanese Utility Model Publication No. 47-25179

  However, in the above dust collector, in addition to the dust collecting motor and fan, a new power source such as a dust remover and a motor for configuring the automatic dust removing mechanism is used, leading to an increase in cost and an increase in size. End up.

  Accordingly, an object of the present invention is to provide a dust collector that can add an automatic dust removal function with a simple configuration and can suppress an increase in cost and an increase in size.

In order to achieve the above object, according to the first aspect of the present invention, the motor or the tank is provided with a resonance member that resonates during operation of the motor and has a maximum amplitude at a predetermined number of rotations of the motor. By operating at a rotational speed of 2, the vibration during motor operation can be amplified and transmitted to the filter.
According to a second aspect of the present invention, in the configuration of the first aspect, the motor has a delay function for continuing the motor operation for a predetermined time after the motor operation switch is turned OFF, and the motor rotation speed when the delay function is executed is set to a predetermined value. It is characterized by the rotational speed.

According to the first aspect of the present invention, automatic dust removal performance can be added with a simple configuration in which a resonance member is provided and a dust collecting motor is operated at a predetermined rotational speed. This eliminates the need for a power source such as a motor for automatic dust removal, thereby suppressing an increase in cost and an increase in the size of the dust collector itself.
According to the second aspect of the invention, in addition to the effect of the first aspect, automatic dust removal can be performed at an appropriate timing using the delay function.

It is a perspective view of a dust collector. It is a disassembled perspective view of a dust collector. It is a graph which shows the relationship between the rotation speed of a motor, and the acceleration of a resonance board.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an example of a dust collector, and FIG. 2 is an exploded perspective view thereof. The dust collector 1 is provided with a main body 3 containing an intake unit 4 above a tank 2 having an upper surface opened. The intake unit 4 is suspended and supported from above the center of the tank 2 by a tank cover 5 that closes the opening of the tank 2 and supports the main body 3, and includes a motor (not shown) and a suction fan that rotates by driving the motor. And an intake port 6 is opened at the center of the lower surface. An operation switch 7 and a suction force changeover switch 8 are provided on the upper side surface of the main body 3, and a handle 9 is provided in the upper center of the main body 3. Further, a suction port 10 for connecting a hose, a nozzle or the like is provided on the side surface of the tank 2, and hooks 11, 11 that are locked to the outer edge of the tank cover 5 and close the opening are provided.

  As shown in FIG. 2, between the tank 2 and the main body 3, a main filter 12 that covers the periphery and the lower side of the intake port 6 and a pre-filter 13 that covers the main filter 12 from below are provided as filters. ing. First, the main filter 12 includes a ring-shaped upper locking portion 14 that is locked to the opening of the tank 2, and a tapered filter portion that is continuously provided downward from the upper locking portion 14 and decreases in diameter toward the lower side. Fifteen. The filter unit 15 is a filter around the entire side surface except the bottom surface.

  Next, the pre-filter 13 is connected to the ring-shaped lower locking portion 16 that is locked to the opening of the tank 2 below the upper locking portion 14 of the main filter 12 and the lower locking portion 16. The taper-shaped filter part 17 which is provided and becomes a small diameter as it goes below is comprised. The filter portion 17 is a flexible bottomed tube made of cloth or paper. When the filter portion 17 is locked to the opening of the tank 2 together with the main filter 12, the entire main filter 12 is covered from the lower side to cover the tank 2. It is designed to bulge inside.

A resonance plate 18 as a resonance member is provided on the lower surface of the tank cover 5. The resonance plate 18 includes a horizontal plate portion 19 that is fixed to the lower surface of the tank cover 5 in the vicinity of the intake unit 4, and a vertical plate portion 20 that protrudes downward from the end of the horizontal plate portion 19 into the main filter 12. It becomes the L-shaped board which consists of.
In this resonance plate 18, the vibration generated during the operation of the motor is transmitted, so that the vertical plate portion 20 that is the downward free end resonates. The acceleration (amplitude) due to this resonance is caused by the filters 12 and 13. The shape, size, and mounting direction are determined so as to be maximized at a predetermined rotational speed (resonance rotational speed) that is lower than the no-load rotational speed of the motor in the absence of the motor.

On the other hand, the motor control circuit does not stop the motor immediately when the operation switch 7 is turned off, but keeps the motor energized for a certain time (several seconds) and sucks the dust remaining in the hose and the like. Are installed side by side. Here, the rotational speed of the motor when this delay function is executed is set to the resonant rotational speed of the resonance plate 18.
FIG. 3 is a graph showing the relationship between the rotational speed of the motor and the acceleration of the resonance plate 18 in the dust collector 1, and the maximum acceleration (approximately 124 m / s) at a resonant rotational speed 8000 rpm lower than the no-load rotational speed 18000 rpm. ² ). Therefore, here, the rotational speed of the motor that executes the delay function is set to 8000 rpm.

  In the dust collector 1 configured as described above, when the motor is driven by the ON operation of the operation switch 7 and the suction fan rotates, outside air is sucked into the tank 2 through a hose connected to the suction port 10 and the like. The air passes through the filter 13 and the main filter 12 and is sucked into the intake unit 4 from the intake port 6 and is sent from the intake fan to an air supply path (not shown) and discharged from an exhaust port (not shown). As a result, the dust sucked into the tank 2 together with the outside air is first captured by the filter portion 17 of the prefilter 13, and the fine dust that has passed through the prefilter 13 is captured by the filter portion 15 of the main filter 12.

  When the operation switch 7 is turned OFF, the motor does not stop immediately as described above, and the operation is continued for a predetermined time by the delay circuit. At this time, since the operation is performed at the resonance speed of the resonance plate 18, the resonance plate 18 The vertical plate portion 20 resonates with a large acceleration in the thickness direction indicated by an arrow in FIG. Therefore, the vibration generated during the operation of the motor is amplified and transmitted to the main filter 12 and the pre-filter 13, so that the dust adhering to the main filter 12 and the pre-filter 13 is removed and clogging is eliminated.

Thus, according to the dust collector 1 of the said form, the main body 3 is provided with the resonance plate 18 which resonates during the operation of the motor and has the maximum amplitude at the resonance rotational speed of the motor, and operates the motor at the resonant rotational speed. By amplifying the vibration during operation of the motor so that it can be transmitted to the main filter 12 and the pre-filter 13, the resonance plate 18 is provided and the dust collection motor is operated at a resonance rotational speed. Automatic dust removal performance can be added. This eliminates the need for a power source such as a motor for automatic dust removal, thereby suppressing an increase in cost and an increase in the size of the dust collector itself.
In particular, here, a delay function for continuing the motor operation for a predetermined time after the motor operation switch 7 is turned OFF is provided, and the rotational speed of the motor at the time of executing the delay function is set as the resonance rotational speed. Automatic dust removal is possible at the right time.

In the above embodiment, the motor is rotated at the resonance speed during execution of the delay function after the operation switch is turned off. However, the rotation speed for dust collection when the operation switch is turned on is set to the resonance speed or the switching is performed. By making it possible to select the resonance rotational speed using a switch, the resonant member may resonate during normal operation so that automatic dust removal can be performed.
Further, the form of the resonance member is not limited to a plate shape, but may be another shape such as a rod shape. Furthermore, the mounting position is not limited to the lower surface of the tank cover, and may be the outer surface of the intake unit or the inner surface of the tank as long as it resonates during operation of the motor and can amplify vibrations. It may be the outer surface of the main body or tank.
The present invention also applies to other types of dust collectors, such as those with a long tank, a main body and a tank that are connected to each other by a hinge, and a filter that has only a main filter. Is possible.

  1 .... Dust collector, 2 .... Tank, 3 .... Main body, 4 .... Air intake unit, 6 .... Air intake port, 7 .... Operation switch, 10 .... Suction port, 12 .... Main filter, 13 .... Pre filter , 15, 17... Filter part, 18 .. Resonant plate, 19 .. Horizontal plate part, 20.

Claims (2)

A dust collector in which a main body having an intake unit including a motor and a suction fan is placed above a tank having an intake port, and a filter is interposed between the intake port and the intake unit in the tank. ,
The main body or tank is provided with a resonance member that resonates during operation of the motor and has a maximum amplitude at a predetermined number of rotations of the motor, and the motor is operated at the predetermined number of rotations. A dust collector characterized in that vibration during operation can be amplified and transmitted to the filter.   2. A delay function for continuing the operation of the motor for a predetermined time after turning off the operation switch of the motor, wherein the rotation speed of the motor when the delay function is executed is the predetermined rotation speed. The dust collector according to 1.

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