JP2005160574A - Electric vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric vacuum cleaner capable of ensuring safety of a motor at low cost without using a fuse or a posistor.
SOLUTION: A suction port body provided with a suction chamber having a suction opening on a bottom surface, a rotary cleaning body provided rotatably in the suction chamber, a motor M1 for rotating the rotary cleaning body, and a flow through the motor M1 The vacuum cleaner includes a control device 33 that controls the current to control the drive of the motor and a current detection means 34 that detects the current flowing through the motor M1, and the control device 33 is detected by the current detection means 34. The detected current value is between a first threshold value for detecting a locked state or an overload state of the motor M1 and a second threshold value for detecting a short circuit of the motor, and is set in advance. When the set time T1 is exceeded, the current flowing through the motor M1 is turned off, the current value is equal to or greater than the second threshold, and the time that is equal to or greater than the second threshold is shorter than the first set time T1. T2 Is exceeded, the current flowing through the motor M1 is turned off.
[Selection] Figure 3

Description

  The present invention relates to a vacuum cleaner including a rotating member provided in a suction port, a motor that rotates the rotating member, and a control device that drives and controls the motor.

  2. Description of the Related Art Conventionally, a vacuum cleaner that can ensure safety in the event of a rare short of an electric blower is known (see Patent Document 1).

  In such a vacuum cleaner, a fuse is connected in series to the electric blower, and when the overcurrent flows through the electric blower, the fuse is blown to ensure the safety of the electric blower.

  Conventionally, there has been known an electric vacuum cleaner in which a suction member is provided with a rotating member such as a rotary cleaning member and a driving wheel and a motor that rotates the rotating member.

In order to ensure the safety of the motor of such a vacuum cleaner, if a fuse is connected to the motor in the same manner as described above, it is possible to ensure safety in the event of a rare short of the motor.
JP 2002-360485 A

  However, rotating members such as a rotary cleaning body or a drive wheel provided in the suction port body tend to get entangled with hairs such as carpets, so that the rotation temporarily stops, so an overcurrent flows temporarily to the motor. Or For this reason, if the fuse is blown by the temporary overcurrent, the fuse must be replaced one by one during cleaning, which is very troublesome.

  In order to solve this problem, a posistor may be used instead of a fuse. However, the posistor has a large variation in temperature characteristics, and the posistor must be fixed with an adhesive so that it can withstand impacts due to its weight. However, there is a problem that it takes time and is expensive.

  An object of the present invention is to provide a vacuum cleaner that can ensure the safety of a motor at low cost without using a fuse or a posistor.

The invention of claim 1 includes a suction port body provided with a suction chamber having a suction opening on a bottom surface, a rotating member rotatably provided on the bottom surface or the suction chamber, a motor for rotating the rotating member, and the motor A vacuum cleaner comprising: control means for controlling the current flowing through the motor and controlling the drive of the motor; and current detection means for detecting the power supply current to the motor,
The control means detects the first threshold value for detecting the lock state or the overload state of the motor and a short circuit in the power supply path to the motor, based on the detected current value detected by the current detection means. And when the preset first set time is exceeded, the current flowing through the motor is turned off, the current value is equal to or greater than the second threshold value, and the second threshold value is set. When the above time exceeds a second setting time shorter than the first setting time, the current flowing through the motor is turned off.

  According to the present invention, the safety of the motor can be ensured at low cost without using a fuse or a posistor. In addition, since it is not necessary to use a fuse, it is not necessary to replace the fuse one by one during cleaning even if a temporary overcurrent flows through the motor. Further, since it is not necessary to use a posistor, an operation for fixing the posistor with an adhesive so as to withstand an impact becomes unnecessary.

  Hereinafter, an embodiment of a vacuum cleaner according to the present invention will be described with reference to the drawings. In addition, in this Example, the vacuum cleaner which provided the rotary cleaning body which is one of the rotation members in the suction inlet body is demonstrated.

  In FIG. 1, reference numeral 10 denotes a cleaner body, and a dust collection chamber 12 and an electric blower 11 that makes the dust collection chamber 12 have a negative pressure are provided in the cleaner body 10. A dust collection filter 13 is provided in the dust collection chamber 12.

  Reference numeral 15 denotes a hose whose one end is detachably connected to the cleaner body 10, and a hand operation tube 16 is provided at the other end of the hose 15, and a handle portion 17 is provided at the hand operation tube 16. The handle portion 17 is provided with a hand operation portion 17A provided with an operation switch (not shown).

  An extension pipe 18 is detachably connected to the hand operation pipe 16, and a suction port body 20 is detachably connected to a distal end portion of the extension pipe 18.

  As shown in FIG. 2, the suction port body 20 is provided with a suction chamber 22 having a suction opening 21 on the bottom surface, and a rotary cleaning body 23 is rotatably provided in the suction chamber 22. The rotary cleaning body 23 is rotationally driven by a motor M1 via a gear or a belt (not shown). The suction chamber 22 communicates with the dust collection chamber 12 of the cleaner body 10 through the extension pipe 18 and the hose 15.

  FIG. 3 is a block diagram showing a configuration of a control system for controlling the electric blower 11 and the motor M1.

  In FIG. 3, 31 is a thyristor that causes the current of the AC power source E to flow to the motor M1, 32 is a thyristor that causes the current of the AC power source E to flow to the electric blower 11, and 33 is a motor M1 or electric motor based on the operation of the operation switch of the operation unit 17A. This is a control device (control means) for controlling the current flowing through the blower 11, and this control device 33 is composed of a CPU and the like.

Reference numeral 34 denotes current detection means for detecting a current (feed current) flowing in the motor M1, and the current detection means 34 is constituted by, for example, a coil or a resistor that generates a voltage according to the current flowing in the motor M1. A power supply circuit 35 supplies a DC power supply voltage to the control device 33.
[Operation]
Next, operation | movement of the vacuum cleaner comprised as mentioned above is demonstrated based on the flowchart shown in FIG.

  When the electric blower 11 is driven by operating the operation switch of the operation unit 17A, the dust collection chamber becomes negative pressure, and this negative pressure acts on the suction chamber 22 of the hose 15, the extension pipe 18 and the suction port body 20, Dust is sucked together with air from the suction opening 21 of the chamber 22. Air and dust sucked into the suction chamber 22 are collected by the dust collection filter 13 of the dust collection chamber 12 of the cleaner body 10 through the extension pipe 18 and the hose 15.

  On the other hand, when the motor M1 is driven by the operation of the operation switch, the rotary cleaning body 23 rotates and scrapes dust adhering to, for example, a carpet. The dust thus sucked up is sucked into the suction chamber 22 and collected in the dust collection filter 13 of the dust collection chamber 12 of the cleaner body 10 through the extension pipe 18 and the hose 15 as described above.

  Then, in step 1 shown in FIG. 4, it is determined whether or not the motor M1 is operating at a certain position, that is, whether or not the motor M1 is driven. If no, the process returns to step 1, and if yes, the process proceeds to step 2. Here, since the motor M1 is driven, it is determined as YES and the process proceeds to Step 2.

  In step 2, the current flowing through the motor M1 is detected by the current detection means 34.

  In step 3, it is determined whether or not the detected current detected by the current detecting means 34 is equal to or greater than the first threshold value. If no, the process returns to step 1;

  Here, the first threshold value is set to a value slightly smaller than the current that flows when the hair of the carpet is entangled with the rotary cleaning body 23 and the rotation of the rotary cleaning body stops and the motor M1 is locked. That is, the current flowing through the motor M1 when the motor M1 is locked or overloaded is set to exceed the first threshold, and this first threshold is when the motor M1 is not locked or not overloaded. The current is larger than the current flowing through the motor M1.

  If the motor M1 is not locked or overloaded, the processing operations of Step 1 to Step 3 are repeated.

  When the motor M1 is locked, it is determined as YES in step 3, and the process proceeds to step 4.

  In step 4, it is determined whether or not the detected current is greater than or equal to the second threshold value. If yes, the process proceeds to step 5, and if no, the process proceeds to step 7.

  The second threshold value is set to a value that is larger than the current that flows when the motor M1 is locked and slightly smaller than the overcurrent that flows when the motor M1 is short-circuited. That is, the overcurrent that flows when the motor M1 is short-circuited exceeds the second threshold value.

  Here, since the motor M1 is simply locked, it is determined NO in step 4 and the process proceeds to step 7.

  In step 7, it is determined whether or not the time during which the detected current exceeds the first threshold is T1 (first set time) or more. If no, the process returns to step 1, and if yes, the process proceeds to step 6.

  By the way, for example, the time during which the lock of the motor M1 or the load of the motor M1 occurs during the cleaning of the carpet is short, and the lock of the motor M1 is not continued for a long time. Similarly, the load on the motor M1 does not continue for a long time. In addition, since the motor M1 is frequently locked during the cleaning of the carpet, it becomes very inconvenient if the motor M1 is turned off during the cleaning.

  Further, since the short-time locking of the motor M1 or the like does not cause any trouble, if the duration of the locking of the motor M1 or the like is T1 (about 5 to 6 seconds) or less, the process returns to step 1 to return to the motor. M1 is not stopped.

  If the duration of the lock of the motor M1 exceeds T1 time, that is, if the lock continues for a long time, a malfunction occurs. Therefore, it is determined that there is an abnormality and the process proceeds to Step 6. In Step 6, the motor M1 Is stopped to stop the driving of the motor M1. That is, as shown in FIG. 5, when the time during which the detected current exceeds the first threshold becomes T1 or more, the current of the motor M1 (detected current) is set to zero to ensure safety.

  When the power supply path of the motor M1 (path from the AC power supply E to the motor M1) or the motor M1 is short-circuited, the power supply current to the motor M1 becomes greater than or equal to the second threshold value, so that it is determined as YES in step 4 Proceed to step 5. In step 5, it is determined whether or not the time during which the detected current exceeds the second threshold has exceeded T2 (second set time: about 0.2 seconds). If no, the process returns to step 1; If so, go to Step 6.

  T2 is a time shorter than T1, and even if the detected current exceeds the second threshold value, no trouble is caused in a short time, so the process returns to Step 1. If T2 is exceeded, the motor M1 is short-circuited. If it is determined that the motor M1 is present, the process proceeds to step 6 to immediately turn off the current flowing in the motor M1 and stop the driving of the motor M1. That is, as shown in FIG. 6, when the time during which the detected current exceeds the second threshold becomes T2 or more, the current of the motor M1 (detected current) is immediately zeroed to ensure safety.

  Thus, even if a fuse or a posistor is not used, the current flowing to the motor M1 is turned off when the motor M1 is locked or when the motor M1 is short-circuited. By not using it, an inexpensive vacuum cleaner can be provided. Also, by not using the fuse, it is not necessary to replace the fuse one by one during cleaning even if a temporary overcurrent flows through the motor. Further, since it is not necessary to use a posistor, an operation for fixing the posistor with an adhesive so as to withstand an impact becomes unnecessary.

  In the said Example, although the motor M1 which rotates the rotary cleaning body 23 was demonstrated, it is not restricted to this, For example, the motor which rotates the driving wheel provided in the suction inlet body 20 may be sufficient.

It is the perspective view which showed the external appearance of the vacuum cleaner which concerns on this invention. It is the side view which showed the suction inlet of the vacuum cleaner shown in FIG. It is the block diagram which showed the structure of the control system of the vacuum cleaner shown in FIG. It is the flowchart which showed operation | movement of the vacuum cleaner shown in FIG. It is the graph which showed the relationship between the 1st threshold and detection current. It is the graph which showed the relation between the 2nd threshold and detection current.

Explanation of symbols

20 Suction Port 22 Suction Chamber 23 Rotating Cleaning Body 33 Control Device (Control Unit)
34 detection means M motor

Claims (2)

A suction port body provided with a suction chamber having a suction opening on the bottom surface, a rotating member rotatably provided on the bottom surface or the suction chamber, a motor for rotating the rotating member, and a current flowing through the motor; A vacuum cleaner comprising control means for driving and controlling the motor, and current detection means for detecting a current supplied to the motor,
The control means detects the first threshold value for detecting the lock state or the overload state of the motor and a short circuit in the power supply path to the motor, based on the detected current value detected by the current detection means. And when the preset first set time is exceeded, the current flowing through the motor is turned off, the current value is equal to or greater than the second threshold value, and the second threshold value is set. The electric vacuum cleaner characterized by turning off the electric current which flows into the motor when the above time exceeds the 2nd set time shorter than the 1st set time. The electric vacuum cleaner according to claim 1, wherein the rotating member is a rotary cleaning body provided in the suction chamber.

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