JP2020137615A - Vacuum cleaner - Google Patents

Abstract

To provide a vacuum cleaner for enhancing convenience in cleaning while securing stability of more realistic standard compared with a conventional manner in consideration of a substantial loading state of an electric blower.SOLUTION: A vacuum cleaner 1 includes: an electric blower 8 for generating negative pressure; a current detection section 58 for detecting a current flowing in the electric blower 8; a power voltage detection section 59 for detecting a voltage of a power supply of the electric blower 8; and a main body control section 9 for comparing a proper range of a current flowing in the electric blower 8, which is fixed by a voltage to be detected by the power voltage detection section 59, with a detection result of the current detection section 58, and reducing or blocking an input of the electric blower 8 when a detection result of the current detection section 58 is deviated from a proper range.SELECTED DRAWING: Figure 3

Description

An embodiment of the present invention relates to a vacuum cleaner.

A vacuum cleaner is known that monitors the current flowing through an electric blower and supplies electric power at a current value that blows a fuse to the electric blower when an abnormal current is detected.

Japanese Unexamined Patent Publication No. 9-206255

When a conventional vacuum cleaner detects an abnormal current flowing through an electric blower, it blows a fuse to stop the electric blower and prevents the electric blower from restarting thereafter. Therefore, the degree of abnormality of the electric blower is reduced. While safety can be ensured regardless of the situation, even if the degree of abnormality is minor, cleaning cannot be continued.

However, a more realistic level of safety can be ensured in view of the specific situation in which an abnormal current flows through the electric blower, for example, an appropriate range of the current flowing through a normal electric blower with respect to the voltage of the power supply.

Therefore, an object of the present invention is to provide an electric vacuum cleaner capable of improving the convenience of cleaning while ensuring a more realistic level of stability than before in consideration of the substantial load condition of the electric blower. To do.

In order to solve the above problems, the vacuum cleaner according to the embodiment of the present invention detects an electric blower that generates negative pressure, a current detection unit that detects a current flowing through the electric blower, and a voltage of a power source of the electric blower. When the appropriate range of the current determined from the voltage detected by the power supply voltage detection unit and the detection result of the current detection unit are compared and the detection result deviates from the appropriate range. Includes a control unit that reduces or cuts off the input of the electric blower.

The perspective view which shows the appearance of the vacuum cleaner which concerns on embodiment of this invention. The figure which shows by partially cutting out the electric blower of the vacuum cleaner which concerns on embodiment of this invention. The block diagram which shows the vacuum cleaner which concerns on embodiment of this invention. The flowchart which shows the input suppression process of the vacuum cleaner which concerns on embodiment of this invention. The figure which shows the relationship between the electric current flowing through an electric blower, and the air volume in the vacuum cleaner which concerns on embodiment of this invention. The flowchart which shows the restart restriction processing of the vacuum cleaner which concerns on embodiment of this invention.

An embodiment of the vacuum cleaner according to the present invention will be described with reference to FIGS. 1 to 6. In the plurality of drawings, the same or corresponding configurations are designated by the same reference numerals.

FIG. 1 is a perspective view showing the appearance of the vacuum cleaner according to the embodiment of the present invention.

As shown in FIG. 1, the vacuum cleaner 1 according to the present embodiment is a so-called canister type. The vacuum cleaner 1 includes a vacuum cleaner main body 2 that can travel on the surface to be cleaned, and a pipe portion 3 that can be attached to and detached from the vacuum cleaner main body 2. The vacuum cleaner main body 2 and the pipe portion 3 are fluidly connected.

The vacuum cleaner main body 2 includes a main body case 5, a pair of wheels 6 provided on the left and right side portions of the main body case 5, a detachable dust separating dust collecting portion 7 arranged in the front half portion of the main body case 5. It includes an electric blower 8 housed in the latter half of the main body case 5, a main body control unit 9 that mainly controls the electric blower 8, and a power cord 11 that guides electric power to the electric blower 8.

The vacuum cleaner main body 2 drives the electric blower 8 with the electric power supplied through the power cord 11. Further, the vacuum cleaner main body 2 exerts a negative pressure generated by driving the electric blower 8 on the pipe portion 3. The vacuum cleaner 1 sucks dust-containing air (hereinafter referred to as “dust-containing air”) from the surface to be cleaned through the pipe portion 3, separates the dust from the dust-containing air, and collects the separated dust. Then, it accumulates and exhausts clean air after separating dust.

A main body connection port 12 is provided on the front portion of the main body case 5. The main body connection port 12 is a fluid inlet of the vacuum cleaner main body 2 and has a joint structure for detachably connecting the pipe portion 3. The main body connection port 12 fluidly connects the pipe portion 3 and the dust separation / dust collection portion 7.

The wheel 6 is a large-diameter traveling wheel and supports the vacuum cleaner main body 2.

The dust separation / dust collection unit 7 separates dust from the dust-containing air flowing into the vacuum cleaner main body 2, collects and accumulates the dust, and sends clean air from which the dust has been removed to the electric blower 8. The dust separation / dust collecting unit 7 may be of a centrifugal separation method or a filtration separation method.

The electric blower 8 sucks air from the dust separation / dust collecting unit 7 to generate a negative pressure (suction negative pressure).

The main body control unit 9 includes a microprocessor (not shown) and a storage device (not shown) that stores various arithmetic programs and parameters executed by the microprocessor. The storage device stores a plurality of preset operation modes. The plurality of preset operation modes are related to the magnitude of the operation output of the electric blower 8 and correspond to the user's operation on the pipe portion 3. Different input values (input values of the electric blower 8) are set in each operation mode. The main body control unit 9 selectively selects an arbitrary operation mode corresponding to the operation from a plurality of preset operation modes according to the input received by the pipe unit 3, reads it from the storage unit, and reads the operation mode. The electric blower 8 is controlled according to the above.

The power cord 11 supplies electric power to the vacuum cleaner main body 2 from a wiring plug connector (not shown, so-called outlet). A plug 14 is provided at the free end of the power cord 11.

The pipe portion 3 sucks dust-containing air from the surface to be cleaned by the negative pressure acting from the vacuum cleaner main body 2 and guides it to the vacuum cleaner main body 2. The pipe portion 3 is fluidly connected to a connecting pipe 19 as a joint that is detachably connected to the vacuum cleaner main body 2, a dust collecting hose 21 that is fluidly connected to the connecting pipe 19, and a dust collecting hose 21. The hand operation tube 22, the grip portion 23 protruding from the hand operation tube 22, the operation unit 24 provided on the grip portion 23, the extension tube 25 detachably connected to the hand operation tube 22, and the extension tube 25. It includes a suction port body 26 that is detachably connected.

The connection pipe 19 is a joint that is detachably connected to the main body connection port 12, and is fluidly connected to the dust separation / dust collection unit 7 through the main body connection port 12.

The dust collecting hose 21 is a long and flexible hose having a substantially cylindrical shape. One end (here, the rear end) of the dust collecting hose 21 is fluidly connected to the connecting pipe 19. The dust collection hose 21 is fluidly connected to the dust separation / dust collection unit 7 through the connection pipe 19.

The hand operation pipe 22 relays the dust collecting hose 21 and the extension pipe 25. One end of the hand control tube 22 (here, the rear end) is fluidly connected to the other end of the dust collection hose 21 (here, the front end). The hand operation pipe 22 is fluidly connected to the dust separation / dust collection unit 7 through the dust collection hose 21 and the connection pipe 19.

The grip portion 23 is a portion that the user grips by hand in order to operate the vacuum cleaner 1. The grip portion 23 projects from the hand operation tube 22 in an appropriate shape that can be easily gripped by the user.

The operation unit 24 includes a switch associated with each operation mode. Specifically, the operation unit 24 supplies power to the stop switch 24a associated with the operation stop operation of the electric blower 8, the start switch 24b associated with the operation start operation of the electric blower 8, and the suction port body 26. A brush switch 24c associated with the above is provided. The stop switch 24a and the start switch 24b are electrically connected to the main body control unit 9. The user of the vacuum cleaner 1 can selectively select the operation mode of the electric blower 8 by operating the operation unit 24. The start switch 24b also functions as an operation mode selection switch during the operation of the electric blower 8. In this case, the main body control unit 9 switches the operation mode in the order of strong → medium → weak → strong → medium → weak → ... each time the operation signal is received from the start switch 24b. The operation unit 24 may individually include a strong operation switch (not shown), a medium operation switch (not shown), and a weak operation switch (not shown) instead of the start switch 24b.

The extension tube 25 having a telescopic structure in which a plurality of tubular bodies are superposed is an elongated and substantially cylindrical tube that can be expanded and contracted. One end of the extension pipe 25 (here, the rear end) is provided with a detachable joint structure at the other end (here, the front end) of the hand operating pipe 22. The extension pipe 25 is fluidly connected to the dust separation / dust collection unit 7 through the hand operation pipe 22, the dust collection hose 21 and the connection pipe 19.

The suction port body 26 is movable or slidable on a surface to be cleaned such as a wooden floor or a carpet, and has a suction port 28 on the bottom surface facing the surface to be cleaned in the running state or the sliding state. Further, the suction port body 26 includes a rotatable rotary cleaning body 29 arranged at the suction port 28 and an electric motor 31 for driving the rotary cleaning body 29. One end of the suction port body 26 (here, the rear end) is provided with a detachable joint structure at the other end (here, the front end) of the extension pipe 25. The suction port body 26 is fluidly connected to the dust separation / dust collection unit 7 through an extension pipe 25, a hand operation pipe 22, a dust collection hose 21 and a connection pipe 19. That is, the suction port body 26, the extension pipe 25, the hand operation pipe 22, the dust collection hose 21, the connection pipe 19, and the dust separation / dust collection unit 7 are suction air passages from the electric blower 8 to the suction port 28. The electric motor 31 alternately repeats operation start and stop each time it receives an operation signal from the brush switch 24c.

The vacuum cleaner 1 starts the electric blower 8 when the start switch 24b is operated. For example, in the vacuum cleaner 1, when the start switch 24b is operated while the electric blower 8 is stopped, the electric blower 8 is first operated in the strong operation mode, and when the start switch 24b is operated again, the electric blower 1 is operated. 8 is operated in the medium operation mode, and when the start switch 24b is operated three times, the electric blower 8 is operated in the weak operation mode, and so on. The strong operation mode, the medium operation mode, and the weak operation mode are a plurality of preset operation modes, and the input value to the electric blower 8 is smaller in the order of the strong operation mode, the medium operation mode, and the weak operation mode. The started electric blower 8 exhausts air from the dust separation / dust collecting unit 7 to create a negative pressure inside the dust collecting unit 7.

The negative pressure in the dust separation / dust collecting unit 7 acts on the suction port 28 through the main body connection port 12, the connection pipe 19, the dust collection hose 21, the hand operation pipe 22, the extension pipe 25, and the suction port body 26 in order. To do. The vacuum cleaner 1 sucks dust on the surface to be cleaned together with air by a negative pressure acting on the suction port 28 to clean it. The dust separation / dust collecting unit 7 separates dust from the dust-containing air sucked into the vacuum cleaner 1 and accumulates the dust, while sending the air separated from the dust-containing air to the electric blower 8. The electric blower 8 exhausts the air sucked from the dust separation / dust collection unit 7 to the outside of the vacuum cleaner main body 2.

FIG. 2 is a diagram showing a partially cutaway electric blower of the vacuum cleaner according to the embodiment of the present invention.

As shown in FIG. 2, the electric blower 8 of the vacuum cleaner 1 according to the present embodiment includes a centrifugal fan portion 36 having an intake port 35 and a motor portion 38 having an exhaust port 37.

The motor unit 38 is a commutator electric motor. The motor unit 38 includes a motor housing 39 having an exhaust port 37, a stator 41 provided on the inner peripheral surface 39a of the motor housing 39, a rotor 42 rotatably supported in the motor housing 39, and a motor housing 39. A pair of brush mechanisms 43, which are provided in the above and electrically connected to the rotor 42, are provided.

The stator 41 surrounds the rotor 42 in an annular shape.

The rotor 42 is arranged inside the stator 41. The rotor 42 includes a rotor shaft 45 which is a center of rotation, a rotor core 46 provided on the rotor shaft 45, a field winding 47 wound around the rotor core 46, and a field winding 47 provided on the rotor shaft 45. It is equipped with a commutator 48, which is electrically connected to the motor.

The brush mechanism 43 presses the brush holder 51 fixed through the brush holder fixing portion 49 of the motor housing 39, the slidable brush 52 housed in the brush holder 51, and the brush 52 against the commutator 48. It includes a coil spring 53 and. The brush 52 is a carbon brush.

FIG. 3 is a block diagram showing a vacuum cleaner according to an embodiment of the present invention.

As shown in FIG. 3, the vacuum cleaner 1 according to the present embodiment includes a main body control circuit 55 that is electrically connected to the commercial AC power supply E via a plug 14.

The main body control circuit 55 controls the operation of the electric blower 8. The main body control circuit 55 converts the electric blower 8 connected in series to the commercial AC power supply E, the switching element 56 for opening and closing the electric circuit connecting the commercial AC power supply E and the electric blower 8, and the commercial AC power supply E. A main body power supply unit 57 that supplies operating power to the main body control unit 9, a current detection unit 58 that detects the current flowing through the electric blower 8, a power supply voltage detection unit 59 that detects the power supply voltage of the electric blower 8, and an electric blower. It is provided with a main body control unit 9 that controls the operation of 8.

The switching element 56 is an element such as a bidirectional thyristor or a reverse blocking 3-terminal thyristor, and includes a gate connected to the main body control unit 9. The switching element 56 changes the input of the electric blower 8 according to the change in the gate current.

The main body power supply unit 57 is a power supply circuit that generates a control power supply for the main body control unit 9.

The current detection unit 58 is, for example, a current transformer or a shunt resistor. The current detection unit 58 converts the detected current value into a voltage value and outputs it to the main body control unit 9. The current value detected by the current detection unit 58 tends to decrease when the suction air volume of the electric blower 8 decreases due to dust clogging or the like, and increases when the suction air volume of the electric blower 8 increases due to the elimination of dust clogging or the like. It is in.

The power supply voltage detection unit 59 detects the voltage of the power supply of the electric blower 8 and the voltage of the commercial AC power supply E in this embodiment and outputs the voltage to the main body control unit 9. The voltage of the commercial AC power supply E is not always constant, and fluctuates when power is supplied to a device other than the vacuum cleaner 1, for example.

The main body control unit 9 includes a microcomputer, and includes a central processing unit (not shown), a storage unit 61, an I / O unit (not shown), and a timer (not shown). The storage unit 61 stores in advance data such as a control program executed by the central processing unit and constants necessary for executing the control program. This data includes constants indicating input values corresponding to each preset operation mode. Further, the storage unit 61 is a data storage area and a work area for temporarily storing the calculation data of the central processing unit and the like.

Further, the main body control unit 9 periodically reads the operation signal output by the operation unit 24 and the zero cross timing of the commercial AC power supply E detected by the zero cross detector (not shown), and follows the selected operation mode. The switching control (phase control) of the switching element 56 is performed to control the input of the electric blower 8.

Further, the main body control unit 9 controls the input of the electric blower 8 according to, for example, three operation modes including weak, medium and strong. Each time the main body control unit 9 receives an operation signal from the start switch 24b, the operation mode is sequentially switched to perform switching control of the switching element 56.

Furthermore, the main body control unit 9 determines the appropriate range Ir of the current flowing through the electric blower 8 and the detection result of the current detection unit 58, which is determined by the voltage of the power supply (here, the commercial AC power supply E) detected by the power supply voltage detection unit 59. That is, when the detection result (measured value Im) is out of the appropriate range Ir by comparing with the measured value Im of the current flowing through the electric blower 8, the input of the electric blower 8 is reduced or cut off. Hereinafter, this process by the main body control unit 9 is referred to as an input suppression process.

The input suppression process by the main body control unit 9 will be described in detail.

FIG. 4 is a flowchart showing an input suppression process of the vacuum cleaner according to the embodiment of the present invention.

FIG. 5 is a diagram showing the relationship between the current flowing through the electric blower and the air volume in the vacuum cleaner according to the embodiment of the present invention.

Note that FIG. 5 is shown assuming that the electric blower 8 is operated in the strong operation mode. Further, FIG. 5 schematically shows the relationship between the current flowing through the electric blower 8 and the air volume as a straight line.

As shown in FIGS. 4 and 5, the main body control unit 9 according to the present embodiment measures the current flowing through the electric blower 8 determined by the voltage of the power supply (here, the commercial AC power supply E) detected by the power supply voltage detection unit 59. The appropriate range Ir is compared with the detection result of the current detection unit 58, that is, the measured value Im of the current flowing through the electric blower 8, and if the detection result (measured value Im) is out of the appropriate range Ir, the electric blower 8 Reduce or block input.

Further, when the detection result (actual measurement value Im) is out of the appropriate range Ir, the main body control unit 9 limits the number of restarts of the electric blower 8 thereafter.

Further, when the detection result (actual measurement value Im) is less than the appropriate range Ir, the main body control unit 9 blocks the input to the electric blower 8.

Here, as shown in FIG. 5, the current flowing through the electric blower 8 of the vacuum cleaner 1 according to the present embodiment decreases when the electric blower 8 is sound and the air volume of the electric blower 8 becomes small due to dust clogging or the like. There is a tendency (characteristic shown by solid line A in FIG. 5). The characteristic A of the electric blower 8 in a healthy state changes due to the fluctuation of the voltage detected by the power supply voltage detection unit 59, for example, the fluctuation of ± 20V in the commercial AC power supply E of 100V, that is, the change between 80V and 120V. Then, assuming that, the solid line A80 and the solid line A120 change.

Further, the current flowing through the electric blower 8 greatly increases (shifts upward), for example, when the field winding 47 of the rotor 42 fails in the short mode (solid line B). On the other hand, the current flowing through the electric blower 8 is greatly lowered (shifted downward) when, for example, the field winding 47 of the rotor 42 fails in the disconnection mode (solid line C).

Therefore, assuming that the fluctuation of the commercial AC power supply E is ± 20 V, the appropriate range Ir of the current flowing through the electric blower 8 includes the solid line A80 and the solid line A120, while the solid line so that each failure mode can be detected. It is defined in an appropriate range excluding B and solid line C. The appropriate range Ir is set from the results obtained experimentally in advance and stored in the storage unit 61. Further, the appropriate range Ir may be different for each operation mode. For example, the appropriate range Ir applied to the weak operation mode in which the current flowing through the electric blower 8 is small is narrower than the appropriate range Ir in the operation mode in which the current flowing through the electric blower 8 is larger, that is, the medium operation mode and the strong operation mode. Also good (the upper limit of the proper range Ir is lower and the lower limit of the proper range Ir is higher).

Then, specifically, the main body control unit 9 reads the voltage of the power supply of the electric blower 8 from the power supply voltage detection unit 59 while the electric blower 8 is being operated (step S31), and from the result, the electric blower 8 is read. The appropriate range Ir of the current flowing through the circuit is determined (step S32).

Next, while the electric blower 8 is being operated, the main body control unit 9 reads the detection result of the current detection unit 58, that is, the measured value Im of the current flowing through the electric blower 8 (step S33), and flows to the electric blower 8. The appropriate range Ir of the current and the measured value Im of the current flowing through the electric blower 8 are compared (step S34).

If the measured value Iam of the current flowing through the electric blower 8 is included in the appropriate range Ir of the current flowing through the electric blower 8, the main body control unit 9 (lower limit value of the appropriate range Ir ≤ measured value Iam ≤ upper limit of the appropriate range Ir). Value, step S34 Yes), the operation of the electric blower 8 is continued as it is (step S35), and the process returns to step S31.

On the other hand, when the measured value Iam of the current flowing through the electric blower 8 deviates from the appropriate range Ir of the current flowing through the electric blower 8, the main body control unit 9 (measured value Im <lower limit value of the appropriate range Ir, or measured value Im). > The upper limit of the appropriate range Ir, step S34 No), the appropriate range deviation information is stored in the storage unit 61 (step S36), and the input of the electric blower 8 is reduced or cut off (steps S37 to S39).

Specifically, when the measured value Iam of the current flowing through the electric blower 8 is less than the appropriate range Ir of the current flowing through the electric blower 8, the main body control unit 9 (measured value Im <lower limit value of the appropriate range Ir, step. S37 Yes), the input of the electric blower 8 is cut off and stopped (step S38). Further, when the measured value Iam of the current flowing through the electric blower 8 exceeds the appropriate range Ir of the current flowing through the electric blower 8, the main body control unit 9 (measured value Im> upper limit of the appropriate range Ir, step S37 No). , The input of the electric blower 8 is reduced (step S39), and the operation of the electric blower 8 is continued.

Further, when the storage unit 61 stores the appropriate range deviation information, the main body control unit 9 permits the restart of the electric blower 8 only a predetermined number of times, for example, five times, and thereafter, the electric blower 8 of the electric blower 8. Prohibit restart. This is called restart restriction processing.

FIG. 6 is a flowchart showing a restart restriction process of the vacuum cleaner according to the embodiment of the present invention.

As shown in FIG. 6, when the main body control unit 9 of the vacuum cleaner according to the present embodiment starts the electric blower 8, it first determines whether or not the appropriate range deviation information is stored in the storage unit 61. (Step S41). If the storage unit 61 does not store the appropriate range deviation information (step S41 No), the main body control unit 9 starts the electric blower 8 at the rated input of the strong operation mode, for example, 1000 watts (step S42). ).

On the other hand, when the storage unit 61 stores the appropriate range deviation information (step S41 Yes), the main body control unit 9 counts the number of restarts (step S43). The main body control unit 9 counts up or down the number of restarts, and when the number of restarts reaches a predetermined number (step S44 Yes), stores the restart prohibition information in the storage unit 61 (step S44 Yes). Step S45) The process is completed, and the restart of the electric blower 8 after that is prohibited.

On the other hand, the main body control unit 9 reduces the input of the electric blower 8 until the number of restarts reaches a predetermined number (step S44 No), and starts the electric blower 8 at, for example, 100 watts (step S46.

The input reduction of the electric blower 8 in step S46 is not only reduced to 100 watts at once, but also gradually, for example, from 1000 watts to 700 watts, 400 watts, and 100 watts each time the electric blower 8 is restarted. It may be reduced stepwise at each restart as in.

As described above, the vacuum cleaner 1 according to the present embodiment has an appropriate range Ir and current detection of the current flowing through the electric blower 8 determined by the voltage of the power supply (here, the commercial AC power supply E) detected by the power supply voltage detection unit 59. When the detection result of the unit 58, that is, the measured value Iam of the current flowing through the electric blower 8 is compared and the detection result (measured value Im) is out of the appropriate range Ir, the input of the electric blower 8 is reduced or cut off. By doing so, it is possible to avoid smoke and ignition of the electric blower 8 and obtain high safety.

Further, the vacuum cleaner 1 according to the present embodiment is a vacuum cleaner by limiting the number of restarts of the electric blower 8 thereafter when the detection result (actual measurement value Im) is out of the appropriate range Ir. It is possible to prevent 1 from suddenly becoming unusable, and to improve convenience while ensuring safety in the event of an abnormality in the electric blower 8.

Further, the vacuum cleaner 1 according to the present embodiment cuts off the input to the electric blower 8 when the detection result (actual measurement value Im) is less than the appropriate range Ir, so that the field winding 47 is in the disconnection mode. When it is predicted that a failure has occurred, more safety can be emphasized.

Therefore, according to the vacuum cleaner 1 according to the present invention, the convenience of cleaning can be improved while ensuring a more realistic level of stability than before in consideration of the substantial load condition of the electric blower 8.

The vacuum cleaner 1 according to the present embodiment is not limited to the canister type, but may be an upright type, a stick type, a handy type, or the like. Further, the vacuum cleaner 1 may be a cordless type equipped with a secondary battery in addition to the commercial AC power source E.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Electric vacuum cleaner, 2 ... Vacuum cleaner body, 3 ... Pipe part, 5 ... Body case, 6 ... Wheels, 7 ... Dust separation and dust collection part, 8 ... Electric blower, 9 ... Main body control unit, 11 ... Power cord, 12 ... Main body connection port, 14 ... Plug, 19 ... Connection pipe, 21 ... Dust collection hose, 22 ... Hand control pipe, 23 ... Grip part, 24 ... Operation part, 24a ... Stop switch, 24b ... Start switch, 24c ... brush switch, 25 ... extension pipe, 26 ... suction port body, 28 ... suction port, 29 ... rotary cleaner, 31 ... electric motor, 35 ... intake port, 36 ... centrifugal fan part, 37 ... exhaust port, 38 ... motor part , 39 ... motor housing, 39a ... inner peripheral surface, 41 ... stator, 42 ... rotor, 43 ... brush mechanism, 45 ... rotor shaft, 46 ... rotor core, 47 ... field winding, 48 ... commutator, 49 ... Brush holder fixing part, 51 ... Brush holder, 52 ... Brush, 53 ... Coil spring, 55 ... Main body control circuit, 56 ... Switching element, 57 ... Main body power supply unit, 58 ... Current detection unit, 59 ... Power supply voltage detection unit, 61 … Memory.

Claims (3)

An electric blower that produces negative pressure and
A current detector that detects the current flowing through the electric blower, and
A power supply voltage detector that detects the voltage of the power supply of the electric blower, and
The appropriate range of the current determined from the voltage detected by the power supply voltage detection unit is compared with the detection result of the current detection unit, and if the detection result is out of the appropriate range, the input of the electric blower A vacuum cleaner equipped with a control unit that reduces or shuts off. The vacuum cleaner according to claim 1, wherein the control unit limits the number of times of restarting the electric blower after that when the detection result is out of the appropriate range. The vacuum cleaner according to claim 1 or 2, wherein the control unit cuts off the input to the electric blower when the detection result is less than the appropriate range.

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