JP2019076545A - Vacuum cleaner - Google Patents

Abstract

To provide a vacuum cleaner capable of suppressing deterioration or a failure in heat generation components including an electric blower and other mounting components when clogging occurs in a dust catching filter arranged in the vacuum cleaner without limiting a usable time of a user concerning a vacuum cleaner.SOLUTION: A vacuum cleaner includes: an electric blower 601; control means 602 for controlling the electric blower 601; a dust catching filter 603 arranged on a suction side of the electric blower 601; and clogging determination means 604 for determining a clogging state of the dust catching filter 603. In the vacuum cleaner, a current to flow into the electric blower 601 is suppressed in response to a determination result of the clogging determination means 604.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vacuum cleaner.

2. Description of the Related Art Conventionally, in a vacuum cleaner, a dust collection filter is used to prevent entry of dust into a main body incorporating an electric blower and a control circuit.
Generally, the dust collection filter is disposed on the suction side of the electric blower, and air taken in from the outside passes through the dust collection filter with the drive of the electric blower, and dust is removed. The air from which the air has been removed is blown into the body. Moreover, the effect of cooling the heat generating components used in the electric blower and the control circuit is expected by the air blown at this time.

  However, when the dust collection filter is clogged, the air taken in from the outside is reduced, and the effect of cooling the heat-generating component is reduced. As a result, the temperature rise of the heat-generating component may lead to the deterioration or failure of the heat-generating component or other mounted components.

    Therefore, a thermistor is used to detect the temperature inside the main body of the vacuum cleaner, and when the temperature inside exceeds a predetermined value, the operation is stopped to take measures to suppress the temperature rise of the heat-generating component. (Patent Document 1).

  Further, a measure is also taken to determine clogging of the dust collection filter and prompt the user to clean the dust collection filter. As a method of determining clogging, a method of detecting a change in negative pressure on the suction side of the electric blower using pressure detection means, and a method of determining clogging, or suction of the electric blower using air volume detection means There has been proposed a method of determining a clogging by detecting a change in air volume on the side (Patent Document 2).

Japanese Patent Application Laid-Open No. 10-201688 JP 2004-201919 A

  Generally, when using a vacuum cleaner, there is a need to operate the vacuum cleaner until the end of the cleaning operation, even if the dust collection filter is clogged a little.

In the configuration using the thermistor, first, if the internal temperature detected by the thermistor exceeds a predetermined value, the operation is immediately stopped, so that the needs can not be satisfied. In addition, since the thermistor generates a time delay with respect to an actual temperature change, it may not be able to follow a steep temperature change. Furthermore, the mounting of the thermistor may increase the size of the control circuit and increase the cost.
In addition, in the configuration using a pressure sensor, the control circuit or the vacuum cleaner main body may become large and the cost may increase because components necessary for the pressure detection means are mounted.
Further, in the configuration using the air volume detection means, since the components necessary for the air volume detection means are mounted as in the configuration using the pressure sensor, the control circuit or the vacuum cleaner main body becomes large, and the cost increases. There is a risk of

  The present invention has been made in view of such circumstances, and an electric vacuum cleaner capable of extending the operation time when clogging of the dust collection filter occurs while suppressing the temperature rise of the heat-generating component. Intended to be provided. Another object of the present invention is to provide a vacuum cleaner which has a good tracking ability and low cost clogging determination means.

  In order to achieve the above object, a vacuum cleaner according to the present invention comprises an electric blower, a control means for controlling the electric blower, a dust collection filter disposed on the suction side of the electric blower, and the dust A vacuum cleaner comprising a clogging determination means for determining a clogging state of a collection filter, and suppressing an electric current flowing into the electric blower according to the determination result of the clogging determination means.

  According to the present invention, when clogging of the dust collection filter occurs, the temperature rise of the electric blower and the control circuit relatively increase by suppressing the current flowing into the electric blower. The temperature rise of the part for driving the electric fan having a large calorific value can be suppressed, and furthermore, at this time, since the electric fan continues the operation, the operation time when the clogging of the dust collection filter occurs is extended Can provide a vacuum cleaner that can.

  In addition, as a method of determining the clogging state of the dust collection filter, a detection value necessary for controlling the electric blower, such as the number of rotations of the electric blower or a current value flowing into the electric blower, is used. By doing this, it is possible to provide a vacuum cleaner provided with the clogging determination means at a higher compliance than when using a thermistor, and at a lower cost than when using a pressure sensor or an air volume sensor.

It is a basic composition figure of a vacuum cleaner which is a 1st embodiment of the present invention. It is a functional block diagram of a program of a vacuum cleaner which is a 1st embodiment of the present invention. It is a state transition diagram regarding the operation state of the vacuum cleaner which is a 1st embodiment of the present invention. It is a state transition table regarding the operation state of the vacuum cleaner which is a 1st embodiment of the present invention. It is the characteristic view which showed the air volume at the time of clogging generation | occurrence | production of the vacuum cleaner which is 1st Embodiment of this invention, rotation speed, and the relationship of an electric current. It is a perspective view showing a vacuum cleaner which is a 1st embodiment of the present invention.

    An embodiment of the present invention will be described below with reference to the attached drawings.

  FIG. 1 is a basic configuration diagram of the vacuum cleaner of the present embodiment.

  The electric vacuum cleaner includes a rechargeable battery 101 for supplying energy, a smoothing capacitor 102, an electric blower 103, an inverter circuit 106 for converting direct current power into alternating current power and outputting the converted alternating current power to the electric blower 103, an inverter Driver circuit 107 for driving circuit 106, control device 108 for driving driver circuit 107, current detection means 109 for detecting current flowing into electric blower 103, DC for detecting DC voltage applied to inverter circuit 106 A voltage detection means 110 and a switch signal generation means 111 for transmitting a switch signal for switching the operation state of the electric blower 103 are provided.

  The energy supplied by the rechargeable battery 101 is smoothed by the smoothing capacitor 102 and applied to the inverter circuit 106.

  The control device 108 is configured by a microcomputer (CPU), and functions are realized by executing a program stored in a ROM (not shown).

  The control device 108 calculates the number of rotations of the electric blower 103 based on the current detected by the current detection unit 109.

  The control device 108 determines the clogging state of the dust collection filter (not shown) based on the number of rotations of the electric blower 103.

The control device 108 outputs the current detected by the current detection means 109, the voltage detected by the DC voltage detection means 110, the clogging state of the dust collection filter (not shown), and the switch signal generation means 111. The control signal to be output to the driver circuit 107 is created by the switch signal.
The current detection unit 109 detects the current flowing to the electric blower 103 from the current flowing to the inverter circuit 106.

  The DC voltage detection means 110 detects the voltage applied to the inverter circuit 106 from the voltage across the smoothing capacitor 102.

  The switch signal generation means 111 is usually operated by the user and outputs a switch signal.

  FIG. 2 is a functional block diagram of a program incorporated in the control device 108. As shown in FIG.

  In FIG. 2, the control device 108 calculates the number of rotations of the electric blower 103 based on the current detected by the switch signal determination unit 201 that determines the switch signal output from the switch signal generation unit 111 and the current detection unit 109. Detection means 202, clogging determination means 203 for determining the clogging state of the dust collection filter (not shown) based on the rotational speed calculated by the rotational speed detection means 202, and switch signal determination means 201. The operation state switching means 204 switches the operation state from the judgment result and the judgment result of the clogging judgment means 203, the current detected by the current detection means 109, the voltage detected by the DC voltage detection means 110, and the operation state switching means 204 Driver control means 205 for outputting a control signal of the driver circuit 107 based on the operation state information output by the Eteiru.

  The switch signal determination means 201 is based on at least a switch signal output from the switch signal generation means 111, an operation start signal for specifying the operation start of the electric blower 103, and an operation stop signal for specifying the operation stop of the electric blower 103. And the determined switch signal information is output.

  The clogging determination means 203 is at least a first threshold based on the number of rotations at the lowest air volume point and a second threshold based on the number of rotations at the clogging suppression air volume point larger in air volume than the lowest air volume point. And the threshold of

The clogging determination unit 203 compares and determines the threshold value of the clogging determination unit 203 with the rotational speed information output from the rotational speed detection unit 202, and outputs the determined clogging state information.
The operating state switching means 204 at least sets the rotational speed of the electric blower at the time of operation of driving the electric blower 103, stopping state of stopping the electric blower 103, and clogging of the dust collection filter (not shown). It has the clogging suppression state which suppresses.

  The operating state switching means 204 determines the operating state based on the current operating state information, the switch signal information output from the switch signal determining means 201, and the clogging state information output from the clogging determining means 203. Output the determined operation state information.

  The driver control unit 205 generates a driver control signal based on the operation state information output from the operation state switching unit 204, the current detected by the current detection unit 109, and the voltage detected by the DC voltage detection unit 110. Then, the generated driver control signal is input to the driver circuit 107.

  Next, as processing contents of a program incorporated in the control device 108, processing of the operation state switching unit 204 will be described with reference to FIGS.

  FIG. 3 is a state transition diagram showing the state transition of each operation state of the operation state switching means 204.

  FIG. 4 is a state transition table which represents the state transition diagram shown in FIG. 3 in a table form.

  The state transition diagram of FIG. 3 shows the stop state 301 in which the electric blower 103 is stopped, the operation state 302 in which the electric blower 103 is driven without suppression, and dust as the minimum operation states that the operation state switching means 204 can have. The clogging suppression state 303 which is driving by suppressing the current flowing into the electric blower 103 when the clogging of the collection filter (not shown) occurs is included.

  Further, as a condition for generating the transition to the above-mentioned operation state, the clogging determination A input from the switch signal determination unit 201, the operation start signal input 311, the operation stop signal input 312, and the clogging determination unit 203 (Clogging suppression air volume) 313 and clogging determination B (minimum air volume) 314 are included.

Here, the clogging determination A (for clogging suppression air) 313 represents that the rotational speed of the electric blower 103 is equal to or higher than the second threshold value of the clogging determination unit 203, and the clogging determination B (see FIG. The minimum air volume 314 indicates that the rotational speed of the electric blower 103 is equal to or higher than the first threshold value of the clogging determination unit 203.
If the operation start signal input 311 is generated when the operation state is the stop state 301, the operation state transitions to the operation state 302.

  When the operation state is the operation state 302 and the operation stop signal input 312 is generated, the operation state transitions to the stop state 301. Further, when the clogging determination A (clogging suppression air volume) 313 occurs, the operation state transitions to the clogging suppression state 303.

  When the operation state is the clogging suppression state 303 and the operation stop signal input 312 or the clogging determination B (minimum air volume) 314 is generated, the operation state transitions to the stop state 301.

  Next, as processing contents of a program incorporated in the control device 108, processing of the clogging determination unit 203 will be described with reference to FIG.

  FIG. 5 shows the air volume sucked by the electric blower 103, the number of rotations of the electric blower 103, and the electric blower 103 when clogging of the dust collection filter (not shown) occurs when the operation state is the operation state 302. It is the characteristic view showing the relation of the current which flows into.

  If clogging of the dust collection filter (not shown) occurs while the operating state is the operating state 302, the control device 108 increases the number of rotations of the electric blower 103 to secure the amount of air to be sucked. The driver control circuit 107 is driven.

  At this time, in the case where the clogging of the dust collection filter (not shown) is ignored and the operation state 302 is continued, the electric operation is performed according to the degree of clogging of the dust collection filter (not shown). The number of rotations of the blower 103 changes as the number of rotations of the electric blower (without suppression) 501 shown in FIG. 5, and the degree of clogging increases and the number of rotations of the motor blower 103 decreases. Will increase.

  When the air volume sucked by the electric blower 103 falls below the minimum air volume capable of suppressing the temperature rise of the heat generating components including the electric blower 103, the heat generating components including the electric blower 103 and other mounted components deteriorate or fail. It is necessary to stop the electric blower 103 because it may cause

  Here, as the current flowing into the electric blower 103 is indicated by the electric blower current (with suppression) 505 shown in FIG. 5, the rotational speed of the electric blower 103 is the eye of the dust collection filter (not shown). The rotational speed corresponding to the clogging suppression air volume point 506 having a larger air volume than the lowest air volume point (minimum air volume point (without suppression) 503 shown in FIG. 5) when the operating state 302 is continued ignoring clogging is exceeded. By suppressing the case, it is possible to expect a reduction in the temperature rise of the heat-generating component including the electric blower 103.

  In addition, the amount of temperature rise of the heat-generating component including the electric blower 103 can be reduced, so that the minimum air volume capable of suppressing the temperature rise can be reduced. Therefore, compared with the case where the current flowing into the electric blower 103 is not suppressed The blower 103 can be driven for a long time.

  Thus, by dividing the clogging state according to the rotation speed of the electric blower 103, the rotation speed of the electric blower 103 exceeds the second threshold based on the rotation speed according to the clogging suppression air volume point. In this case, transition to the clogging suppression state 303 is performed, and the temperature increase of the electric blower 103 and the temperature of the inverter circuit 106 having a relatively large amount of heat generation in the control circuit are suppressed by suppressing the rotational speed of the electric blower 103. You can control the rise.

  Further, at this time, since the electric blower 103 continues the operation, the operation time when the dust collection filter (not shown) is clogged can be extended.

  In addition, when the rotational speed of the electric blower 103 exceeds a first threshold based on the rotational speed according to the lowest air volume point, transition to the stop state 301 is performed, and the electric blower 103 is stopped to thereby achieve electric operation. Deterioration or failure of the blower 103 and other mounted components is prevented.

  In addition, by using the rotational speed of the electric blower 103 as the clogging determination condition of the dust collection filter (not shown), the followability is higher than when using a thermistor, and a pressure sensor or an air flow sensor is used. The clogging determination means 203 can be provided at lower cost than when used.

  The present invention is not limited to the above-described embodiment, and, for example, the following various modifications are possible.

  Although the said embodiment calculated (detected) the rotation speed of an electric blower based on the electric current which flows in into an electric blower, the rotational position of an electric blower is detected by position detection apparatuses, such as a Hall sensor, and an electric blower The number of rotations of may be calculated (detected).

  Moreover, although the said embodiment used the charging battery as an electric power supply source, you may supply electric power from an alternating current power source via a rectifier circuit, a voltage doubler circuit, etc. FIG.

DESCRIPTION OF SYMBOLS 101 rechargeable battery 102 smoothing capacitor 103 electric blower 104 electric motor 105 fan 106 inverter circuit 107 driver circuit 108 control device 109 current detection means 110 voltage detection means 111 switch signal generation means 201 switch signal determination means 202 rotation speed detection means 203 clogging determination means 204 operation state switching means 205 driver control means 301 stop state 302 operation state 303 clogging suppression state 311 operation start signal input 312 operation stop signal input 313 clogging judgment A (clogging suppression)
314 Clogging judgment B (minimum air volume)
501 Electric blower rotational speed (no suppression)
502 Electric blower current (no suppression)
503 Minimum Airflow Point (No Suppression)
504 Electric blower speed (with suppression)
505 Electric blower current (with suppression)
506 Clogging suppression air volume point 507 Minimum air volume point (with suppression)
601 Electric blower 602 Control means 603 Filter for dust collection 604 Clogging judgment means 605 Charging battery 606 Dust collection unit 607 Operation switch 608 Suction port

Claims (3)

With an electric blower,
Control means for controlling the electric blower;
A dust collection filter disposed on the suction side of the electric blower;
And c) clogging determination means for determining a clogged state of the dust collection filter,
The electric vacuum cleaner characterized by suppressing the electric current which flows into the said electric blower according to the determination result of the said clogging determination means.   2. The vacuum cleaner according to claim 1, wherein the clogging determination threshold value of the clogging determination means is at least two or more in accordance with the state of the electric blower. Motor blower characteristic measurement means for measuring the characteristic characteristic of the motor blower;
Storage means for storing the result measured by the motor blower characteristic measurement means;
3. The vacuum cleaner according to claim 1, wherein a correction is made at the time of clogging determination in accordance with the measurement result of the electric fan characteristic measurement means stored in the storage means.

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