JP5056431B2 - Dust collector - Google Patents

Description

  The present invention suctions cutting dust and grinding dust together with water for power tools for cutting wood such as circular saws and jigsaws, and power tools used for drilling, cutting and polishing in concrete and stone such as hammer drills and stone cutters. The present invention relates to a wet and dry dust collector for separation.

  Electric power tools for cutting wood such as circular saws and jigsaws, and dust collectors for collecting cutting dust and grinding dust from electric tools used for drilling, cutting, and polishing in concrete and stone such as hammer drills and stone cutters A fine filter for separating fine dust and air is used, but when the filter is immersed in water, it is clogged and loses its function.

  On the other hand, in drilling, cutting, and polishing of concrete and stone such as hammer drills and stone cutters, water is dripped into the cutting area to prevent the scattering of cutting dust and the blade is cooled, or the workpiece is watered. It is performed by washing. For this reason, in a wet and dry dust collector that sucks dry dust and water-containing dust, a pair of electrodes is provided immediately before the filter is immersed in water so that the filter is not immersed in water. A water level detection function is provided to stop the intake device when the current between the electrodes becomes equal to or higher than a preset value by utilizing the fact that the current flows due to the conductivity of the aqueous solution.

  In a dust collector equipped with the above water level detection function, if a certain amount of water accumulates at the bottom of the tank, the water in the tank undulates when the dust collector body is moved, and a current flows for a short time between the electrodes. Therefore, once the current flows for more than 1 second, the intake system is stopped, and once the water level detection function is activated, it will not operate as a dust collector unless the dust collector ON / OFF switch is turned off. Has been.

  By the way, in patent document 1, in order to prevent the malfunction of a float switch, in the wet and dry vacuum cleaner, while installing the switch part of a float switch in the front-end | tip part of a bottomed cylindrical float switch mounting body, a float can be raised / lowered freely An external configuration has been proposed.

Patent Document 2 proposes a dust collector that automatically operates a dust removing device to remove dust from a filter when the filter is clogged.
Japanese Patent Laid-Open No. 5-228076 JP 2007-245019 A

  However, in conventional dry / wet dust collectors that suck both dry dust and water-containing dust, an acceptable amount of water has accumulated in the tank, so the water level detection function is activated, and then the ON / OFF switch is turned OFF and turned ON. Then, the intake device is in an operating state for about 1 second, and when the ON / OFF switch is repeatedly turned OFF and ON, the intake device continues to operate and gradually sucks water into the tank, so that the filter is immersed in water. There was a problem.

  In addition, when the intake device is stopped because an allowable amount of water has accumulated in the tank, the user may not know what caused the intake device to stop.

  The present invention has been made in view of the above problems, and the objective of the present invention is that after an allowable amount of water has accumulated in the tank, the intake device is in an operating state even if the ON / OFF switch is turned OFF and turned ON. Therefore, an object of the present invention is to provide a dust collector capable of solving the problem that water is gradually sucked into a tank and a filter is immersed in water because the intake device is continuously operated.

In order to achieve the above object, the invention according to claim 1
An air intake device for sucking dust,
A tank for storing dust sucked from the suction port by the suction device;
Water level detecting means for detecting the water level in the tank;
An ON / OFF switch for instructing operation / stop of the intake device;
When the water level in the tank exceeds a predetermined threshold, in the dust collector for stopping the intake device in the operating state,
Control means is provided to prevent the intake device from being in an operating state when the ON / OFF switch is turned on while the water level in the tank exceeds a predetermined threshold value.

Further, according to the present invention, when the ON / OFF switch is in an ON state and the intake device is in an operating state, the intake device is stopped after a certain period of time with the water level in the tank exceeding a predetermined threshold. It is characterized by becoming a state.

The invention according to claim 2 is characterized in that, in the invention according to claim 1 , the water surface detecting means is constituted by a pair of electrodes.

The invention according to claim 3 is the invention according to claim 2, wherein a filter device for separating dust and air is provided in the tank, and the pair of electrodes are provided below the filter device. To do.

The invention according to claim 4 is the invention according to any one of claims 1 to 3 , wherein the ON / OFF switch for instructing operation / stop of the intake device and the ON / OFF switch are in the ON state. And a control circuit having means for bringing the intake device into operation, and the control means is constituted by the control circuit.

The invention according to claim 5 is characterized in that, in the invention according to any one of claims 1 to 4 , warning means for issuing a warning when the water level in the tank exceeds a predetermined threshold value is provided. .

The invention described in claim 6
An air intake device for sucking dust,
A tank for storing dust sucked from the suction port by the suction device;
Water level detecting means for detecting the water level in the tank;
In the dust collector having the possibility determination means for determining whether or not the intake device can be operated based on the detection signal of the water surface detection means,
Different availability determining means are provided when the intake device is in an operating state and when the intake device is in a stopped state.

  According to the first aspect of the present invention, it is possible to prevent water from being accumulated in the tank up to a water level equal to or higher than a predetermined threshold value, and since the intake device has been continuously operated, water is gradually sucked into the tank and the filter. The problem of water soaking in water is eliminated.

In addition, according to another feature of the present invention , since a certain time is provided until the intake device stops, it is possible to prevent malfunction when the water level in the tank instantaneously exceeds the threshold value.

According to the second aspect of the present invention, malfunction due to dust or the like can be suppressed compared to a mechanical system such as a float system.

According to invention of Claim 3, it can prevent that a filter gets wet with water.

According to the fourth aspect of the present invention, it is not necessary to provide mechanical control means, and the apparatus can be configured compactly.

According to the fifth aspect of the present invention, the user can be informed that the cause of the stop of the intake device is that an allowable amount of water has accumulated in the tank.

According to the sixth aspect of the present invention, it is possible to appropriately determine whether or not the intake device can be operated according to the detection result of the water surface detection means.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a side sectional view of a dust collector according to the present invention, and FIG. 2 is a block diagram showing a configuration of a control device of the dust collector.

  As shown in FIG. 1, the dust collector 1 includes a cylindrical tank 2 for storing dust. A suction port 3 is opened on a side of the tank 2, and an upper opening of the tank 2 is opened. A main motor cover 5 and a head cover 6 integral with the main motor base 4 are clamped, and an intake device 7 is built in between the main motor base 4 and the main motor cover 5.

  The intake device 7 is composed of a suction fan 8 and a main motor 9 that rotationally drives the suction fan 8, and air sucked from an intake port 4a provided in the lower portion of the main motor base 4 is exhausted to an exhaust port 4b. An exhaust path for exhausting the air is constituted by a main motor base 4, a main motor cover 5 and a head cover 6.

  An operation panel 15, a control circuit 14, and an insulating transformer 23 are installed on a portion of the main motor cover 5 located on the suction port 3. As shown in FIG. 2, a pair of lead wires that are inputs to the water surface detection circuit 28 of the control circuit 14 pass through the main motor base 4 and a pair of contacts 25 a provided at the lower portion of the main motor base 4. , 25b.

  On the other hand, as shown in FIG. 1, a filter housing 11 is sandwiched and fixed between the upper opening of the tank 2 and the main motor base 4. And a filter cover 12 that holds the filter 13 so as not to be crushed by the internal negative pressure. The filter 13 and the filter cover 12 constitute a filter device 10.

  A pair of electrodes 27a and 27b whose tips are located below the filter 13 pass through the filter housing 11 and are provided on the main motor base 4 side of the filter housing 11 as shown in FIG. It is connected to the contacts 26a and 26b.

  A pair of contacts 25a, 25b provided at the lower part of the main motor base 4 and a pair of contacts 26a, 26b provided on the main motor base 4 side of the filter housing 11 are in contact with each other, and the pair of contacts The electrodes 27a and 27b are connected to the input of the water surface detection circuit 28 of the control circuit 14.

  An example of the water surface detection circuit 28 is shown in FIG.

  In FIG. 3, IC1 is a comparator, R1, R2, R3, R4, R5, R6, and R7 are resistors, and C1, C2, and C3 are capacitors.

  + 5V is supplied from the DC power supply 24 to the power supply terminal of the comparator IC1. Here, the capacitor C2 is for power supply noise prevention. From the DC power source 24 to one electrode 27a via the resistor R1 and one contact 25a provided on the lower side of the main motor base 4 and one contact 26a provided on the main motor base 4 side of the filter housing 11. A voltage of +5 V is supplied from the DC power source 24, and the other contact 26b provided on the main motor base 4 side of the filter housing 11 from the other electrode 27b and the other contact 25b provided on the lower portion of the main motor base 4. And connected to the ground of the DC power supply 24 via the resistor R2.

The current flowing between the electrodes 27a and 27b is
(5V− (resistance value of resistor R1) × (value of current flowing between electrodes))
Is converted to a voltage expressed by the following formula and input to the + input of the comparator IC1. Here, the resistor R3 and the capacitor C1 are for noise prevention.

  On the other hand, + 5V supplied from the DC power source 24 is divided by resistors R4 and R5 and input to the negative input of the comparator IC1. The output of the comparator IC1 is input to the digital input port P02 of the microcomputer 22. The resistor R6 is a resistor for giving the output voltage of the comparator IC1, and the resistor R7 and the capacitor C3 are for noise prevention.

  When the electrodes 27a and 27b are not immersed in water, the electrodes 27a and 27b are insulated from each other by an insulator such as air or plastic, so that almost no current flows between the electrodes 27a and 27b. About + 5V is input to the + input of IC1. At this time, the output of the comparator IC1 is + 5V.

When both electrodes 27a and 27b are immersed in water, current flows between the electrodes 27a and 27b due to the conductivity of the aqueous solution,
(5V− (resistance value of resistor R1) × (value of current flowing between electrodes))
A voltage converted into a value represented by the following expression is input to the + input of the comparator IC1. For this reason, when the current flowing between the electrodes 27a and 27b is large, the voltage input to the + input of the comparator IC1 becomes low. When the voltage input to the + input of the comparator IC1 becomes lower than the −input of the comparator IC1 input by dividing + 5V supplied from the DC power supply 24 by the resistors R4 and R5, the output of the comparator IC1 is It becomes 0V. The current flowing between the electrodes 27a and 27b is about 10 μA when the electrodes 27a and 27b are short-circuited.

The resistance value of the resistors R4 and R5 is set so that the threshold value of whether or not the electrode at which the output of the comparator IC1 becomes 0V is immersed in water is when the current flowing between the electrodes 27a and 27b is larger than about 3.3 μA. Has been. This corresponds to an equivalent resistance value between the electrodes 27a and 27b of about 1 MΩ. The electrical resistivity of ordinary tap water is about 0.004 to 0.015 × 106
Since it is about Ω · cm, the value has a sufficient margin. Note that a chip resistor or a chip capacitor is used for the water surface detection circuit 28.

  As shown in FIG. 2, the input of the water surface detection circuit 28 of the control circuit 14 includes an input from the capacitor 34 and the negative electrode between the input from the capacitor 33 and the positive electrode and the positive power source, and a negative power source between the inputs. A capacitor 35 is connected between the two.

  Since the water surface detection electrodes 27 a and 27 b are exposed from the filter device 10, an operator takes out the dust suction device 7 attached to the main motor base 4 and the filter device 10 from the tank 2 and removes dust in the tank 2. The water surface detection electrodes 27a and 27b may be touched when the filter is discarded or when the filter 13 is cleaned. At this time, static electricity charged on the human body is discharged to the water surface detection electrodes 27a and 27b.

  Usually, in order to prevent electrification due to dry dust, a conductive material is adopted for the tank 2, the suction port 3, the hose, and the like and connected to the ground. For this reason, the static electricity charged to the operator may be discharged when the operator touches the water surface detection electrodes 27a and 27b during the operation of taking out the filter device 10 from the tank 2. The electrostatic discharge is instantaneously discharged with large energy, and a discharge of several kV may occur.

  When static electricity is discharged to the water surface detection electrodes 27a and 27b, for example, when the static electricity is discharged to the water surface detection electrode 27a, the pulsed current generated by the static electricity flows to the positive power source via the capacitor 34, On the other hand, it flows to the negative power source via the capacitor 33 and the capacitor 35. For this reason, the inflow of the pulsed current to the water surface detection circuit 28 becomes slight, and the water surface detection circuit 28 does not break down due to electrostatic discharge.

  When there are no three capacitors 33, 34, 35 at the input of the water surface detection circuit 28, when static electricity is discharged to the water surface detection electrodes 27a, 27b, the pulsed current generated by the static electricity is generated by the resistor R1, the resistor The path that flows to the DC power source 24 via R2 and the comparator IC1 is traced. For this reason, a chip resistor is used, and the resistor R1 or the resistor R2, which is a high resistance, deteriorates due to migration of electrostatic discharge, and the resistance value may change to impair the water level detection function. Further, the comparator IC1 may fail.

  The control circuit 14 is supplied with power from the power plug 16 and is connected to the main motor 9, the main motor drive circuit 19 that drives the operation of the main motor 9, and the insulation transformer 23. A DC power supply 24 is connected to the secondary side of the insulating transformer 23, and the control circuit 14 that receives power supply from the DC power supply 24 is insulated from the external power supply. Although not shown, the power control element of the main motor drive circuit 19 is electrically insulated by an optical insulating coupler called a phototriac or photocoupler.

  The pair of electrodes 27 a and 27 b for detecting the water surface includes a pair of contacts 25 a and 25 b provided at the lower portion of the main motor base 4 and a pair of contacts 26 a and 26 b provided on the main motor base 4 side of the filter housing 11. To the water surface detection circuit 28.

  The outlet 32 is attached to the operation panel 15, and the current flowing through the outlet 32 is connected to the analog input port Ain 1 of the microcomputer 22 by the current detector 30 and the outlet current detection circuit 31. When the electric tool is connected to the outlet 32 attached to the operation panel 15 and the electric tool is operated by supplying power from the outlet 32, the microcomputer 22 senses that the electric tool has been operated. When the dust collector 1 automatically enters the operating state and the power tool is stopped, the operation mode function of the interlocking operation mode for stopping the dust collector 1 after automatically putting it in the operating state for several seconds, It has a single-action operation mode function that uses an operation switch to clean the floor. Note that switching between the linked operation mode and the single-acting operation mode is performed by a single / linked switching switch 29.

  The warning lamp 20 is controlled by the warning lamp drive circuit 21 to be turned on / off or blinking and a signal from the output port D1 of the microcomputer 22 to warn when the current flowing between the electrodes 27a and 27b exceeds a predetermined threshold. To emit.

  Next, the control operation of the dust collector 1 according to the present invention will be described based on the flowcharts shown in FIGS.

  When power is supplied to the control circuit 14 by connecting the power plug 16 to the power source and the microcomputer 22 is in an operating state, initialization processing 100 is performed as shown in FIG. 4, and registers, RAM, input / output ports, etc. are initialized. It becomes a state.

  Next, the process waits for an instruction waiting input scan 110 starting from A.

  In the processing of the instruction waiting input scan 110, the states of the ON / OFF switch 17, the water surface detection circuit 28, the single / linkage changeover switch 29, and the outlet current detection circuit 31 are scanned. Then, when the ON / OFF switch 17 is ON, the input from the water surface detection circuit 28 is smaller than the water level detection threshold value, and the single / interlocking switch 29 is ON, the process proceeds to single action operation starting from B. When the ON / OFF switch 17 is ON, the input from the water surface detection circuit 28 is smaller than the water level detection threshold value, and the single / linkage changeover switch 29 is OFF and the outlet current is larger than the threshold value, the linked operation starting from C When the ON / OFF switch 17 is ON and the input from the water surface detection circuit 28 exceeds the water level detection threshold for more than 1 second, the process proceeds to D1 of the water level detection process starting from D. In FIG. 2, reference numeral 18 denotes an ON / OFF switch detection open circuit.

  In the single action operation process starting from B, the main motor ON process 121 is performed, and the process of the single action input scan 120 starting from B1 is entered.

  In the processing of the single-action input scan 120, the states of the ON / OFF switch 17, the water surface detection circuit 28, the single / interlocking switch 29, and the outlet current detection circuit 31 are scanned. When the ON / OFF switch 17 is OFF, the ON / OFF switch 17 is ON, the input from the water surface detection circuit 28 is smaller than the water level detection threshold, and the single / interlocking switch 29 is OFF. When the outlet current is smaller than the threshold value, the main motor OFF process 126 is performed, the process shifts to the instruction wait input scan 110 starting from A, the ON / OFF switch 17 is ON, and the input from the water surface detection circuit 28 is received. When it is smaller than the water level detection threshold value and the single / interlocking switch 29 is OFF and the outlet current is larger than the threshold value, the process proceeds to the interlocking operation process C1 starting from C, the ON / OFF switch 17 is ON, and the water surface detection circuit When the input from 28 exceeds the water level detection threshold for more than 1 second, the water level detection process starting from D is performed. Row.

  In the linked operation process starting from C, the main motor ON process 131 is performed, and the linked input scan process starting from C1 is entered.

  In the process of the interlock input scan 130 shown in FIG. 5, the states of the ON / OFF switch 17, the water surface detection circuit 28, the single / interlock switch 29 and the outlet current detection circuit 31 are scanned. When the ON / OFF switch 17 is OFF, the main motor OFF process 147 is performed, and the process shifts to the instruction waiting input scan 110 process starting from A. The ON / OFF switch 17 is ON and the water surface detection circuit 28 is switched on. Is smaller than the water level detection threshold value and the single / interlock switch 29 is ON, the process proceeds to a single action operation B1 starting from B, the ON / OFF switch 17 is ON, and the water surface detection circuit 28 5 is smaller than the water level detection threshold value, and when the single / interlocking switch 29 is OFF and the outlet current is smaller than the threshold value, the 5-second timer ON process 141 is performed, and the 5-second operation input scan process 140 starting from C2 is performed. , The ON / OFF switch 17 is ON, and the input from the water surface detection circuit 28 exceeds 1 second, and the water level detection threshold When larger, the process proceeds to the water level detection process starting from D.

  In the 5-second operation input scan process 140 starting from C2, the 5-second timer overflow is checked, and the states of the ON / OFF switch 17, the water surface detection circuit 28, the single / interlock switch 29 and the outlet current detection circuit 31 are scanned. ing. When an overflow of the 5-second timer occurs and when the ON / OFF switch 17 is OFF, the main motor OFF process 147 is performed, and the process shifts to the instruction wait input scan process 110 starting from A. When the switch 17 is ON, the input from the water surface detection circuit 28 is smaller than the water level detection threshold value, and the single / interlocking switch 29 is ON, the process proceeds to a single action operation process B1 starting from B, and ON / OFF When the switch 17 is ON, the input from the water surface detection circuit 28 is smaller than the water level detection threshold value, and the single / linkage changeover switch 29 is OFF and the outlet current is larger than the threshold value, the process proceeds to the linked operation process C1 starting from C. When the ON / OFF switch 17 is ON and the input from the water surface detection circuit 28 exceeds 1 second, the water level detection threshold Ri when large, moves to the water level detection process starting from D.

  In the water level detection process starting from D shown in FIG. 4, the main motor OFF process 151 is performed, and after D1, the warning lamp lighting process 152 is performed, and the water level detection key scan process 150 is entered.

  In the water level detection key scan processing 150, the loop is repeated until the ON / OFF switch 17 is turned OFF. For this reason, after the current flowing through the water level detection electrodes 27a, 27b exceeds the water level detection threshold for more than 1 second, the dust collector 1 cannot be put into operation unless the ON / OFF switch 17 is once turned OFF.

  When the ON / OFF switch 17 is turned OFF, a warning lamp extinguishing process 154 is performed, and the process shifts to an instruction waiting input scan process 110 starting from A.

  As described above, when the amount of water accumulated in the tank 2 is less than the allowable amount and the current flowing between the pair of water level detection electrodes 27a and 27b does not exceed the water level detection threshold for more than 1 second, the power plug 16 Is connected to the power source, the ON / OFF switch 17 is turned ON, and the single / interlocking switch 29 is also turned ON, the main motor 9 is turned ON and the dust collector 1 is in an operating state. When the ON / OFF switch 17 is turned off or the single / linkage switch 29 is turned off, the main motor 9 is turned off and the dust collector 1 enters a single-action operation mode in which it is stopped.

  On the other hand, when the ON / OFF switch 17 is turned ON, the single / linkage changeover switch 29 is OFF, and the electric tool connected to the outlet 32 is operated, the main motor 9 is turned ON and the dust collector 1 is in an operating state. Then, when the operation of the electric power tool connected to the outlet 32 is stopped, the dust collector 1 enters an interlocked operation mode in which the dust collector 1 is stopped after being operated for about 5 seconds.

  In both the single-acting operation mode and the linked operation mode, when the main motor 9 is ON and the intake device 7 is in an operating state, water accumulates in the tank and the current flowing through the water level detection electrodes 27a and 27b is 1 second. When exceeding the water level detection threshold, the main motor 9 is turned off and the intake device 7 is stopped. At this time, the warning light 20 is turned on, and the dust collector 1 cannot be put into an operating state unless the ON / OFF switch 17 is once turned OFF.

  Thus, when the ON / OFF switch 17 is in the OFF state and the water surface detection electrodes 27a and 27b are already immersed in water when the instruction waiting input scan processing 110 starting from A is performed, the ON / OFF switch 17 is turned on. When ON, it is determined whether or not the output of the water surface detection circuit 28 is greater than a threshold value in the determination process 111 for determining whether or not the ON / OFF switch 17 is ON. It is determined whether the time when the output of 28 exceeds the threshold value exceeds 1 second. If it does not exceed 1 second, the process returns to the determination processing 111 for determining whether the ON / OFF switch 17 is ON, and the loop is repeated.

  When the time when the output of the water surface detection circuit 28 exceeds the threshold exceeds 1 second, the process proceeds to the water level detection process D1 starting from D, the warning light 20 is turned on by the warning light lighting process 152, and the water level detection key scan process 150 is started. And a loop of a determination process 153 for determining whether the ON / OFF switch 17 is ON is entered. For this reason, even if the ON / OFF switch 17 is turned on while the water surface detection electrodes 27a and 27b are already immersed in water, the dust collector 1 does not enter the operating state.

  As described above, according to the present embodiment, the current flowing between the electrodes 27a and 27b exceeds a predetermined threshold in the wet and dry dust collector 1 capable of sucking both dry dust and water-containing dust. Even if the ON / OFF switch 17 is operated in such a state, the dust collector 1 is not put into an operating state. Therefore, after the permissible amount of water has accumulated in the tank 2, the ON / OFF switch 17 is turned OFF and turned ON. 7 does not enter the operating state, and since the intake device 7 is continuously operated, the problem that water is gradually sucked into the tank 2 and the filter 13 is immersed in water is solved.

  In the present embodiment, when the current flowing between the electrodes 27a and 27b exceeds a predetermined threshold value, the warning lamp 20 is turned on and a warning is issued. It can be known that an allowable amount of water has accumulated in the tank 2.

It is side sectional drawing of the dust collector which concerns on this invention. It is a block diagram which shows the structure of the control apparatus of the dust collector which concerns on this invention. It is a circuit diagram which shows an example of the water level detection circuit of the dust collector which concerns on this invention. It is a flowchart which shows control operation | movement of the dust collector which concerns on this invention. It is a flowchart which shows control operation | movement of the dust collector which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collector 2 Tank 3 Suction port 4 Main motor base 4a Main motor base intake port 4b Main motor base exhaust port 5 Main motor cover 6 Head cover 7 Intake device 8 Suction fan 9 Main motor 10 Filter device 11 Filter housing 12 Filter cover 13 Filter 14 Control circuit 15 Operation panel 16 Power plug 17 ON / OFF switch 18 ON / OFF switch detection circuit 19 Main motor drive circuit 20 Warning light 21 Warning light drive circuit 22 Microcomputer 23 Insulation transformer 24 DC power supply 25a, 25b Contact 26a , 26b Contactor 27a, 27b Electrode 28 Water surface detection circuit 29 Single / interlocking switch 30 Current detector 31 Outlet current detection circuit 32 Outlet 33-35 Capacitor C1- C3 Capacitor IC1 Comparator R1-R7 Resistor

Claims (6)

An air intake device for sucking dust,
A tank for storing dust sucked from the suction port by the suction device;
Water level detecting means for detecting the water level in the tank;
An ON / OFF switch for instructing operation / stop of the intake device;
When the water level in the tank exceeds a predetermined threshold, in the dust collector for stopping the intake device in the operating state,
When the ON / OFF switch is in an ON state and the intake device is in an operating state, the intake device is in a stopped state after a certain period of time with the water level in the tank exceeding a predetermined threshold , A dust collector comprising control means for preventing the intake device from being in an operating state when the ON / OFF switch is turned on in a state where the water level exceeds a predetermined threshold . The dust collector according to claim 1 , wherein the water surface detection means is constituted by a pair of electrodes. The dust collector according to claim 2, wherein a filter device that separates dust and air is provided in the tank, and the pair of electrodes is provided below the filter device. An ON / OFF switch for instructing operation / stop of the intake device, and a control circuit including means for setting the intake device to an operating state when the ON / OFF switch is in an ON state, and dust collector according to any one of claims 1 to 3, characterized by being configured by the control circuit. The dust collector according to any one of claims 1 to 4 , further comprising a warning unit that issues a warning when a water level in the tank exceeds a predetermined threshold value. An air intake device for sucking dust,
A tank for storing dust sucked from the suction port by the suction device;
Water level detecting means for detecting the water level in the tank;
In the dust collector having the possibility determination means for determining whether or not the intake device can be operated based on the detection signal of the water surface detection means,
A dust collector comprising different availability determining means when the intake device is in an operating state and when the intake device is in a stopped state.

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