JP2019005099A - Vacuum cleaner - Google Patents

Abstract

To provide a vacuum cleaner for securing high safety by rapidly stopping an electric blower when blockage of a suction air passage to the electric blower is estimated.SOLUTION: A vacuum cleaner 1 includes: an electric blower 8 for generating suction negative pressure; an air quantity detection section 58 for detecting an air quantity Q of air to be sucked by the electric blower 8; and a body control section 9 for controlling the electric blower 8. The body control section 9 discriminates a sudden decrease of an air quantity Q from a decrease other than that, and stops the electric blower 8 when an air quantity Q suddenly decreases within a predetermined time after the start of the electric blower 8 concerning the vacuum cleaner.SELECTED DRAWING: Figure 4

Description

  Embodiments according to the present invention relate to a vacuum cleaner.

  There is known a vacuum cleaner that prevents an excessive increase in temperature of the electric blower by stopping the operation of the electric blower when the power reduction operation occurs a predetermined number of times within a predetermined time or controlling the electric blower with low power.

JP-A-11-146855

  In the conventional vacuum cleaner, the operation of reducing the power of the electric blower occurs a predetermined number of times within a predetermined time before the operation of the electric blower is stopped or controlled with low power. Therefore, for example, even if there is an abnormality in which some large foreign matter is sucked in and the suction air passage leading to the electric blower is blocked, the conventional vacuum cleaner does not perform the power reduction operation of the electric blower a predetermined number of times. Continue operating the electric blower at normal output. That is, the conventional vacuum cleaner may continue to operate the electric blower while the cooling of the electric blower is insufficient.

  If the operation of the electric blower is continued with insufficient cooling, the electric blower may become hot and be damaged, or the casing (case) that covers the electric blower may be deformed.

  Therefore, an object of the present invention is to provide a vacuum cleaner that ensures higher safety by quickly stopping the electric blower when it is estimated that the suction air passage to the electric blower is blocked.

  In order to solve the above problems, an electric vacuum cleaner according to an embodiment of the present invention includes an electric blower that generates a suction negative pressure, an air volume detection unit that detects an air volume of air sucked into the electric blower, and the electric blower. A controller for controlling the airflow, and the controller distinguishes between a sudden decrease in the air volume and a decrease otherwise, and the air volume suddenly falls within a predetermined time after the electric blower is started. When it falls, the said electric blower is stopped.

The perspective view which shows the external appearance of the vacuum cleaner which concerns on embodiment of this invention. The figure which partially cuts and shows 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 of stop control of an electric blower at the time of the air volume fall of the vacuum cleaner which concerns on embodiment of this invention. The flowchart of the other example of stop control of an electric blower at the time of the air volume fall of the vacuum cleaner which concerns on embodiment of this invention.

  An embodiment of a vacuum cleaner according to the present invention will be described with reference to FIGS. 1 to 5. In addition, the same code | symbol is attached | subjected to the same or equivalent structure in several drawing.

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

  As shown in FIG. 1, the vacuum cleaner 1 according to this embodiment is a so-called canister type. The electric vacuum cleaner 1 includes a cleaner body 2 that can travel on a surface to be cleaned, and a pipe portion 3 that is detachable from the cleaner body 2. The vacuum cleaner 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 sides of the main body case 5, a detachable dust separating and collecting portion 7 disposed in the front half of the main body case 5, 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 are provided.

  The vacuum cleaner main body 2 drives the electric blower 8 with electric power supplied via the power cord 11. The vacuum cleaner body 2 causes the negative pressure generated by driving the electric blower 8 to act on the pipe portion 3. The vacuum cleaner 1 sucks air containing dust (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, clean air after accumulating and separating dust is exhausted.

  A main body connection port 12 is provided in the front portion of the main body case 5. The main body connection port 12 is a fluid inlet of the cleaner 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 and dust collection portion 7.

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

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

  The electric blower 8 sucks air from the dust separating and collecting part 7 and generates negative pressure (suction negative pressure).

  The main body control unit 9 includes a microprocessor (not shown) and a storage device (not shown) for storing various arithmetic programs executed by the microprocessor, parameters, and the like. The storage device stores various settings (arguments) related to a plurality of preset operation modes. The plurality of operation modes are associated with the output of the electric blower 8. Different operation values (input values of the electric blower 8 and current values flowing through the electric blower 8) are set in the respective operation modes. Each operation mode is associated with an operation input received by the pipe unit 3. The main body control unit 9 selectively selects an arbitrary operation mode corresponding to the operation input to the pipe unit 3 from a plurality of operation modes set in advance, and reads the setting of the selected operation mode from the storage unit, The electric blower 8 is operated according to the read operation mode setting.

  The power cord 11 supplies power to the cleaner 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 part 3 sucks dust-containing air from the surface to be cleaned by the negative pressure acting from the cleaner body 2 and guides it to the cleaner body 2. The pipe section 3 is fluidly connected to the connection pipe 19 as a joint that is detachably connected to the cleaner body 2, the dust collection hose 21 that is fluidly connected to the connection pipe 19, and the dust collection hose 21. A hand operating tube 22, a gripping part 23 projecting from the hand operating tube 22, an operating part 24 provided on the gripping part 23, an extension tube 25 detachably connected to the hand operating tube 22, and an extension tube 25 And 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 separating and collecting part 7 through the main body connection port 12.

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

  The hand operation tube 22 relays the dust collection hose 21 and the extension tube 25. One end portion (here, the rear end portion) of the hand operation tube 22 is fluidly connected to the other end portion (here, the front end portion) of the dust collecting hose 21. The hand operating tube 22 is fluidly connected to the dust separating and collecting part 7 through the dust collecting hose 21 and the connecting tube 19.

  The grip portion 23 is a portion that the user grips with his / her hand to operate the vacuum cleaner 1. The grip portion 23 protrudes 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 includes a stop switch 24 a associated with the operation stop operation of the electric blower 8, a start switch 24 b associated with the operation start operation of the electric blower 8, and power supply to the suction port body 26. And a brush switch 24c associated with each other. The stop switch 24 a and the start switch 24 b are electrically connected to the main body control unit 9. The user of the vacuum cleaner 1 can alternatively select the operation mode of the electric blower 8 by operating the operation unit 24. The start switch 24 b also functions as an operation mode selection switch during operation of the electric blower 8. In this case, every time an operation signal is received from the activation switch 24b, the main body control unit 9 switches the operation mode in the order of strong → medium → weak → strong → medium → weak →. Note that 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.

  An extension tube 25 having a telescopic structure in which a plurality of cylindrical bodies are superposed is an elongated, substantially cylindrical tube that can be expanded and contracted. One end portion (here, the rear end portion) of the extension tube 25 is provided with a joint structure that is detachable from the other end portion (here, the front end portion) of the hand operation tube 22. The extension pipe 25 is fluidly connected to the dust separating and collecting part 7 through the hand operating pipe 22, the dust collecting hose 21 and the connecting pipe 19.

  The suction port body 26 can run or slide 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 disposed in the suction port 28 and an electric motor 31 that drives the rotary cleaning body 29. One end portion (here, the rear end portion) of the suction port body 26 is provided with a joint structure that is detachable from the other end portion (here, the front end portion) of the extension pipe 25. The suction port body 26 is fluidly connected to the dust separating and collecting part 7 through the extension pipe 25, the hand operating pipe 22, the dust collecting hose 21 and the connecting pipe 19. That is, the suction port body 26, the extension tube 25, the hand operation tube 22, the dust collection hose 21, the connection tube 19, and the dust separation and dust collection unit 7 are suction air paths from the electric blower 8 to the suction port 28. The electric motor 31 alternately starts and stops operation every time it receives an operation signal from the brush switch 24c.

  The electric vacuum cleaner 1 starts the electric blower 8 when the start switch 24b is operated. For example, when the start switch 24b is operated in a state where the electric blower 8 is stopped, the electric vacuum cleaner 1 first operates the electric blower 8 in the strong operation mode, and when the start switch 24b is operated again, the electric blower. The operation mode of 8 is changed to the medium operation mode, and when the start switch 24b is operated three times, the operation mode of the electric blower 8 is changed to the weak operation mode, and the same is repeated thereafter. The strong operation mode, the medium operation mode, and the weak operation mode are a plurality of operation modes set in advance, and the input value to the electric blower 8 is small 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 and collection unit 7 to make the inside negative.

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

  FIG. 2 is a partially cutaway view of the electric blower of the electric 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 this embodiment includes a centrifugal fan part 36 having an intake port 35 and a motor part 38 having an exhaust port 37.

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

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

  The rotor 42 is disposed inside the stator 41. The rotor 42 includes a rotor shaft 45 serving as a rotation center, 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. And a commutator 48 electrically connected to each other.

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

  FIG. 3 is a block diagram illustrating the electric vacuum cleaner according to the 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 a commercial AC power source E through an insertion 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 that opens and closes the electric path 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, an air volume detection unit 58 that detects an air volume Q of air sucked into the electric blower 8, and a main body control unit 9 that controls the operation of the electric blower 8. I have.

  The switching element 56 is an element such as a bidirectional thyristor or a reverse blocking three-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 of the gate current.

  The main body power supply unit 57 is a power supply circuit that generates control power for the main body control unit 9. When the plug 14 of the power cord 11 is removed from the commercial AC power supply E, the main body power supply unit 57 loses power and stops supplying control power.

  The air volume detection unit 58 is a current transformer that measures a current value flowing through the electric blower 8, for example. The air volume detection unit 58 estimates the air volume Q of the air flowing through the electric blower 8 from the change in the current value flowing through the electric blower 8. Note that when the air flow Q leading to the electric blower 8, that is, the pipe portion 3 and the dust separating and collecting portion 7 is closed, and the air volume Q is reduced, the value of the current flowing through the electric blower 8 is reduced. That is, the air volume detection unit 58 detects the amount of decrease in the air volume Q of the air flowing through the electric blower 8 from the amount of decrease in the current value flowing through the electric blower 8. The air volume detection unit 58 converts the detected current value into a voltage value and outputs the voltage value to the main body control unit 9.

  The air volume detection unit 58 may be an air flow meter that directly detects the air volume Q of air sucked into the electric blower 8, for example. In this case, the air volume detector 58 converts the detected air volume Q into a voltage value and outputs the voltage value to the main body controller 9. The air volume detection unit 58 may be a pressure sensor that detects the pressure of air sucked into the electric blower 8, for example. The decrease in the air volume Q of the air sucked into the electric blower 8 is accompanied by a decrease in pressure (an increase in negative pressure). In this case, the air volume detection unit 58 converts the detected pressure into a voltage value and outputs it to the main body control unit 9.

  The main body control unit 9 includes a microcomputer and includes a central processing unit (not shown), a storage unit 59, an I / O unit (not shown), and a timer (not shown). The storage unit 59 stores in advance data such as a control program executed by the central processing unit and constants necessary for execution of the control program. This data includes a constant indicating an input value corresponding to each operation mode set in advance. The storage unit 59 is a data storage area and a work area for temporarily storing calculation data of the central processing unit.

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

  Furthermore, the main body control unit 9 controls the input of the electric blower 8 according to a plurality of operation modes including, for example, a weak operation mode, a medium operation mode, and a strong operation mode. The main body control unit 9 performs switching control of the switching element 56 by sequentially switching the operation mode every time an operation signal is received from the start switch 24b.

  Furthermore, the main body control unit 9 identifies a sudden decrease in the air volume Q detected by the air volume detection unit 58 and other decreases. Then, the main body control unit 9 stops the electric blower 8 when the air volume Q detected by the air volume detection unit 58 suddenly falls within a predetermined time T after the start of the electric blower 8.

  Here, the sudden decrease in the air volume Q of the air sucked into the electric blower 8 is an event in which the air volume Q decreases to a predetermined decrease amount or more at a predetermined determination time Δt. On the other hand, the decrease other than the rapid decrease in the air volume Q of the air sucked into the electric blower 8 is an event in which the air volume Q decreases below a predetermined decrease amount at a predetermined determination time Δt. The sudden decrease in the air volume Q of the air sucked into the electric blower 8 is an event in which the air volume Q decreases by, for example, 50% or more in a predetermined determination time Δt, for example, 3 seconds. On the other hand, a decrease other than a sudden decrease in the air flow rate Q of air sucked into the electric blower 8, in other words, a gradual (slow) decrease in the air flow rate Q of air sucked into the electric blower 8 is a predetermined determination time Δt, for example, 3 This is an event in which the air volume Q falls within, for example, less than 50% per second. The determination time Δt, the reduction rate of the air volume Q, or the reduction amount is set in a range that does not damage the electric blower 8 whose rotational speed has increased. For example, if something like a cushion sucks into the suction port 28 and closes the suction port 28, the air volume Q of the air sucked into the electric blower 8 rapidly decreases. Further, for example, if something like a building block is attracted to the suction port 28 and the suction port 28 is semi-closed (the air passage is partially removed), the air sucked into the electric blower 8 is reduced. The air volume Q gradually decreases.

  Further, the sudden drop in the air volume Q of the air sucked into the electric blower 8 is an event that deviates from the air volume Q expected in each operation mode and decreases by, for example, 50% or more. On the other hand, a decrease other than the sudden decrease in the air flow rate Q of air sucked into the electric blower 8, in other words, a gradual (slow) decrease in the air flow rate Q of air sucked into the electric blower 8 is expected in each operation mode. The event is such that the amount of decrease falls within, for example, less than 50% while deviating from the air volume Q. For example, when the foreign matter has entered the air passage connected to the electric blower 8 from the beginning of operation and the air passage is blocked, but cannot be distinguished from the appearance, the air volume Q of the air sucked into the electric blower 8 is There is a possibility that it has dropped from the start of operation. In such a case, if the rate of change of the air volume Q is evaluated, there is a possibility of overlooking the blockage of the air path. Therefore, in each operation mode, it is preferable to identify as a decrease (rapid decrease or gradual decrease) in the air volume Q of the air sucked into the electric blower 8 even when the expected air volume Q is not obtained. . In this case, it is difficult to detect the decrease in the air volume Q with the decrease in the current value. Therefore, when a current transformer is applied to the air volume detector 58, it is preferable to detect a decrease in the air volume Q based on the magnitude (absolute value) of the current flowing through the electric blower 8, for example.

  By the way, the vacuum cleaner 1 sucks dust and accumulates it in the dust separation and collection unit 7. Therefore, the air volume Q of the air sucked into the electric blower 8 decreases as the dust accumulated in the dust separation and dust collection unit 7 increases, in other words, as the dust separation and dust collection unit 7 approaches full. Therefore, the main body control unit 9 discriminates between a sudden decrease in the air volume Q and a decrease other than that, while accumulating dust in the dust separating and collecting part 7 for a decrease other than the rapid decrease in the air volume Q. In other words, a decrease in the air volume Q in a normal normal use situation is distinguished from a decrease in the other air volume Q. The decrease in the air volume Q in the normal normal use state of the air volume Q of the air sucked into the electric blower 8 is an event in which the air volume Q falls below 5% in a predetermined determination time Δt, for example, 3 seconds. In other words, the gradual (slow) decrease in the air volume Q of the air sucked into the electric blower 8 is an event in which the air volume Q falls within 5% or more and less than 50% in a predetermined determination time Δt, for example, 3 seconds. It is.

  In order to simplify and clarify the following description, the so-called reduction in the air volume in normal normal use, which is caused by the accumulation of dust in the dust separating and collecting part 7, is called “ordinary air volume reduction”. As described above, foreign matter is sucked into the air inlet 28 and the air passage from the air inlet 28 to the electric blower 8, and the reduction in the air volume caused thereby is referred to as “abnormal air volume reduction”.

  Next, stop control when the air flow rate of the electric blower 8 processed by the main body control unit 9 is reduced will be described in detail.

  FIG. 4 is a flowchart of stop control of the electric blower when the air volume of the electric vacuum cleaner according to the embodiment of the present invention is reduced.

  As shown in FIG. 4, the main body controller 9 of the vacuum cleaner 1 according to the present embodiment has a sudden air volume Q detected by the air volume detector 58 within a predetermined time T after the electric blower 8 starts. When it falls, the electric blower 8 is stopped.

  Specifically, when the start switch 24b of the operation unit 24 is operated, the main body control unit 9 starts the electric blower 8 and starts measuring time (step S1). After that, the main body control unit 9 determines whether or not a predetermined time T has elapsed since the start of the electric blower 8 (step S2). The predetermined time T is set to 20 seconds, for example.

  If the predetermined time T determined in advance has not elapsed since the electric blower 8 was started (No in step S2), the main body control unit 9 determines whether or not the air volume Q is abnormally reduced (step S3). . When the air volume Q is not abnormally decreased, in other words, when a normal air volume decrease occurs (No in step S3), the main body control unit 9 operates the electric blower 8 with a normal output (step S4), Return to step S2. On the other hand, when the air volume Q is abnormally decreased (Yes in step S3), the main body control unit 9 determines whether or not the air volume Q is rapidly decreased (step S5).

  When the air flow rate Q of the electric blower 8 is drastically decreased (step S5 Yes), the main body control unit 9 stops the electric blower 8 (step S6) and ends the control. On the other hand, when the air flow rate Q of the electric blower 8 is not rapidly decreased, that is, when the air flow rate Q of the electric blower 8 is slowly decreasing (No in step S5), the main body control unit 9 performs normal output. By applying an input value smaller than that in the case of operation, the operation rotational speed of the electric blower 8 is reduced below normal (step S7), and the process returns to step S2.

  Then, when the predetermined time T has elapsed since the start of the electric blower 8 (Yes in step S2), the main body control unit 9 ends the stop control of the electric blower 8 when the air volume is reduced, and the electric blower 8 Transition to normal operation control.

  In addition, the rotation speed of the electric blower 8 in the normal operation control of the electric blower 8 takes over the stop control of the electric blower 8 when the air volume is reduced. That is, the operation speed of the electric blower 8 in the normal operation control of the electric blower 8 is less than the normal operation speed of the electric blower 8 after passing through Step S7, and goes through Step S6 and Step S7. If only step S4 is passed, the operating rotational speed of the electric blower 8 is maintained as usual.

  In addition, the main body control unit 9, when detecting an abnormal air volume drop after a predetermined time T has elapsed since the start of the electric blower 8 (step S2 Yes), as in step S7, By applying a smaller input value than when operating at an output of, the operating rotational speed of the electric blower 8 is reduced more than usual.

  FIG. 5 is a flowchart of another example of stop control of the electric blower when the air volume of the electric vacuum cleaner according to the embodiment of the present invention is reduced.

  Note that the processing from step S1 to step S7 in FIG. 5 is the same as the processing from step S1 to step S7 in FIG.

  As shown in FIG. 5, the main body control unit 9 of the vacuum cleaner 1 according to the present embodiment performs control to stop the electric blower 8 and then operates the electric blower 8 when operating the electric blower 8. The rotational speed is made lower than the operating rotational speed of the electric blower 8 before the control for stopping the electric blower 8 is performed.

  The stop control of the electric blower 8 here refers to the stop control of step S6 in FIG. 5, and after step S7, the electric blower 8 is stopped based on the operation of the stop switch 24a in the normal operation control of the electric blower 8. In addition, the case where the electric blower 8 is stopped based on the operation of the stop switch 24a during the control of FIG. 5 is excluded.

  Specifically, when the electric blower 8 is stopped (step S6), the main body control unit 9 changes the input value suppression information of the electric blower 8 from, for example, a zero value to a single value (step S11). The input value suppression information is a storage area secured in the storage unit 59.

  When the start switch 24b of the operation unit 24 is operated, the main body control unit 9 confirms the input value suppression information (step S12), and when the input value suppression information = zero value (step S13 Yes), step S1 and subsequent steps. Perform the process. On the other hand, when the input value suppression information is not zero (step S13 No), the main body control unit 9 sets an input value lower than the normal input value (step S14), and the electric blower 8 at the time when the air volume decreases is set. The stop control is ended, and the operation control of the electric blower 8 is continued with the input value lowered.

  Note that the initial value of the input value suppression information is set to zero. Therefore, the processing from step S12 to step S14 is performed after the stop control of step S6 is performed and the input value suppression information is changed to 1 value in step S11.

  The input value lower than the normal input value may be stored in advance in the storage unit 59 or may be calculated by the product of the normal input value and a correction coefficient smaller than 1. . It may be reduced uniformly in each operation mode, or may be different.

  Moreover, the main body control part 9 returns the operation rotation speed of the electric blower 8 to the operation rotation speed of the electric blower 8 before performing control which stops the electric blower 8 once a power supply is lost.

  That is, the input value suppression information in the storage unit 59 is initialized and returns to zero every time the vacuum cleaner 1 is disconnected from the commercial AC power source E.

  Thus, the vacuum cleaner 1 which concerns on this embodiment discriminate | determines from the rapid fall of the air volume Q of the electric blower 8, and other fall, and predetermined time T predetermined after the electric blower 8 starts. The electric blower 8 is stopped when the air volume Q is suddenly reduced within a short time. Therefore, the electric vacuum cleaner 1 can block the air passage connected to the electric blower 8 and the air volume Q is rapidly reduced, and the electric blower 8 can be prevented from being overheated, thereby improving safety.

  By the way, while using the vacuum cleaner 1, even if the foreign matter is sucked in and the air passage connected to the electric blower 8 is closed, the user can easily grasp the situation. On the other hand, if an infant accidentally operates the start switch 24b and a foreign object enters the air passage connected to the electric blower 8 and clogs the air passage, the user cannot grasp the situation and the Start driving. In such a situation, the electric vacuum cleaner 1 stops the electric blower 8 when the air volume Q suddenly falls within a predetermined time T after the electric blower 8 starts. Therefore, the electric vacuum cleaner 1 can stop the electric blower 8 promptly when the air passage connected to the electric blower 8 is blocked before the user is aware and cannot be identified in appearance. On the other hand, the user's convenience can be prioritized without stopping the electric blower 8 even if foreign matter is sucked into the suction port 28 or sucked into the air passage during cleaning.

  Moreover, the vacuum cleaner 1 which concerns on this embodiment performs the control which stops the electric blower 8, and when driving the electric blower 8 after that, makes the electric blower 8 stop the driving | operation rotation speed of the electric blower 8. The operating rotational speed of the electric blower 8 before the control is reduced. Therefore, in the vacuum cleaner 1, the air volume Q of the air sucked into the electric blower 8 is suddenly reduced, and after the electric blower 8 is temporarily stopped, the air passage blockage is not improved, that is, the air passage is blocked. Even if the electric blower 8 is restarted again, the possibility that the electric blower 8 is damaged can be reduced, and thus safety can be improved.

  Furthermore, the vacuum cleaner 1 which concerns on this embodiment will return the driving | running rotation speed of the electric blower 8 to the driving | running rotation speed of the electric blower 8 before performing control which stops the electric blower 8 once a power supply is lost. Therefore, the electric vacuum cleaner 1 operates the electric blower 8 with a normal output when the user removes the foreign matter that has entered the air passage and the obstruction of the air passage is improved. Can fit.

  Therefore, according to the vacuum cleaner 1 which concerns on this embodiment, when obstruction | occlusion of the suction air path to the electric blower 8 is estimated, the electric blower 8 can be stopped rapidly and higher safety | security can be ensured.

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

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and spirit of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Vacuum cleaner, 2 ... Vacuum cleaner main body, 3 ... Pipe part, 5 ... Main body case, 6 ... Wheel, 7 ... Dust separation and dust collection part, 8 ... Electric blower, 9 ... Main body control part, 11 ... Power cord, DESCRIPTION OF SYMBOLS 12 ... Main body connection port, 14 ... Plug, 19 ... Connection pipe, 21 ... Dust collection hose, 22 ... Hand operation pipe, 23 ... Holding part, 24 ... Operation part, 24a ... Stop switch, 24b ... Start switch, 24c DESCRIPTION OF SYMBOLS ... Brush switch, 25 ... Extension pipe, 26 ... Suction port body, 28 ... Suction port, 29 ... Rotary cleaning body, 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 device, 57 ... main body power supply unit, 58 ... air flow detecting portion, 59 ... storage unit.

Claims (3)

An electric blower that generates suction negative pressure;
An air volume detector for detecting an air volume of air sucked into the electric blower;
A control unit for controlling the electric blower,
The control unit discriminates between a sudden decrease in the air volume and other decreases, and when the air volume rapidly decreases within a predetermined time after the electric fan starts, the electric fan Electric vacuum cleaner to stop. When the electric blower is operated after performing the control to stop the electric blower, the control unit is configured to control the operation speed of the electric blower before stopping the electric blower. The vacuum cleaner according to claim 1, wherein the electric vacuum cleaner is made lower than the operating rotational speed. The electric vacuum cleaner according to claim 2, wherein once the power is lost, the control unit returns the operation speed of the electric blower to the operation speed of the electric blower before performing control for stopping the electric blower.

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