JP2005160578A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner securing the safety of a motor at a low cost without using a posistor. <P>SOLUTION: This vacuum cleaner is provided with a suction port body 20 having a suction chamber 22 with a suction opening 21 in the bottom, a rotating cleaning body 23 rotatably provided in the suction chamber 22, a motor M1 rotating the rotating cleaning body 23, a control device 33 controlling a current flowing through the motor M1 and drivingly controlling the motor, a fuse 36 cutting off the supply of the current to the motor M1 in the cutoff, and a current detecting means 34 detecting the current flowing through the motor M1. The control device 33, when the detected current detected by a current detecting means 34 is between a lock termination threshold A1 for detecting a lock of the motor M1 and a short determination threshold A3 for determining a short circuit of the interior of a power supply passage to the motor and stops the supply of the current to the motor M1; and when the detected current is the short determination threshold A3 or more, makes an overcurrent pass to the fuse 36, cuts off the fuse 36 and stops the supply of the current to the motor M1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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 a vacuum cleaner in which a suction member is provided with a rotating member 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, the rotary cleaning body provided in the suction port body or the rotary member such as the rotary hitting member or the driving wheel temporarily stops rotating due to the tangled hair of the carpet or the like. A current flows. 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 temperature characteristics of the posistor vary widely, and the posistor must be fixed with an adhesive so that it can withstand impact 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 posistor.

  In order to achieve this object, the invention of claim 1 includes 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, and the rotating member. A motor to be rotated, a control means for controlling the drive of the motor by controlling the current flowing through the motor, a fuse for cutting off the supply of current to the motor when disconnected, and a current detection means for detecting the current flowing through the motor The control means has a current value of a detection current detected by the current detection means, the first threshold value for detecting the locked state or overload state of the motor and the motor. Current supply to the motor is stopped when it is between the second threshold value for detecting a short circuit in the power supply path of the current and when the current value of the detected current is equal to or greater than the second threshold value, the fuse is overcharged. Electric By cutting the fuse flowed, characterized in that the vacuum cleaner to stop the supply of current to the motor.

  According to this invention, for example, the hair of the carpet is entangled with the rotating member and the rotation of the rotating member is stopped, or the rotation of the rotating member is stopped for other reasons. Even if the current value of the detection current detected by the detection means rises to between the first threshold value for detecting the locked state or the overload state of the motor and the second threshold value for detecting a short circuit of the motor, The control means stops the supply of current to the motor. In this case, since the motor is stopped before the second threshold value for detecting a short circuit in the power supply path to the motor is exceeded, it is possible to prevent a situation in which the lead wire or the like generates heat and ignite. it can. In addition, since the fuse is not cut, the supply of current to the drive motor can be resumed by restarting the vacuum cleaner.

  In addition, according to this configuration, for example, the hair of a carpet is entangled with the rotating member and the rotation of the rotating member is stopped, or the rotation of the rotating member is stopped for other reasons. Even when the current value of the detected current is equal to or greater than a second threshold value, the control means stops the supply of current to the motor by flowing an overcurrent through the fuse and cutting the fuse. Therefore, the safety of the motor can be ensured at low cost without using a posistor.

  Hereinafter, an embodiment of a vacuum cleaner according to the present invention will be described with reference to the drawings. In addition, in a present Example, the example using a rotary cleaning body as a rotation member provided in a suction inlet body is demonstrated below.

  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 as a rotating member in the suction chamber 22. The rotational force of the motor M1 is transmitted to the rotary cleaning body 23 via the belt 24 shown in FIG. 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 shows a control system for the motor M1, and FIG. 4 is a block diagram showing the configuration of the control system for controlling the electric blower 11 and the motor M1. This control system is provided in the cleaner body 10. For convenience of illustration, the electric blower 11 and the like are omitted in FIG.

  In FIG. 4, reference numeral 31 denotes a thyristor that causes the current of the AC power source E to flow to the motor M1, 32 denotes a thyristor that causes the current of the AC power source E to flow to the electric blower 11, and 33 denotes the motor M1 and the 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 flowing through 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 through the motor M1. A power supply circuit 35 supplies a DC power supply voltage to the control device 33, and a fuse 36 is interposed between the current detection means 34 and the thyristor 31.
[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 is rotated to scrape dust adhering to, for example, a carpet or the like. 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.
Step S1
In step S1 shown in FIG. 5, 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 S1, and if yes, the process proceeds to step S2. Here, since the motor M1 is driven, it is determined as YES and the process proceeds to step S2.
Step S2
In step S2, the current flowing through the motor M1 is detected by the current detector 34, and the process proceeds to step S3.
Step S3
In step S3, is the detection current (motor current detection value) of FIG. 6 detected by the current detection means 34 continuously equal to or higher than the lock determination threshold A1 that is the first threshold for a predetermined time (for example, 5 to 6 seconds)? It is determined whether or not.

  When the motor M1 is locked or when the motor M1 is short-circuited, the detected current detected by the current detecting means 34 continues for a predetermined time (for example, 5 to 6 seconds) and is equal to or higher than the lock determination threshold A1. If it is determined that there is, the process proceeds to step S4.

  If the motor M1 is not locked, it is determined that the detected current detected by the current detecting means 34 is continuously smaller than the lock determination threshold A1 for a predetermined time (for example, 5 to 6 seconds), and the process returns to step S1. .

Here, as shown in FIG. 6, the first threshold value, that is, the lock determination threshold value A1, 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. It is set to a value slightly smaller than the current value A2. That is, the current flowing through the motor M1 when the motor M1 is locked is set to exceed the lock determination threshold A1 that is the first threshold, and the lock determination threshold (first threshold) A1 is not locked by the motor M1. The current value is sometimes larger than the current value A0 flowing through the motor M1.
Step S4
In step S4, it is determined whether or not the detection current (motor current detection value) shown in FIG. 7 is continuously equal to or greater than the short determination threshold A3 that is the second threshold for a predetermined time (for example, 0.2 seconds). The

  If the detected current (motor current detection value) continues for a predetermined time (for example, 0.2 seconds) and is equal to or more than the short determination threshold A3 that is the second threshold, the process proceeds to step S5.

  On the other hand, if the detected current (motor current detection value) continues for a predetermined time (for example, 0.2 seconds) and is not greater than or equal to the short determination threshold A3 that is the second threshold, the process proceeds to step S6.

Here, the second threshold, that is, the short determination threshold A3 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 short-circuit determination threshold A3 that is the second threshold.
Step S5
In step S5, the control device 33 sets the supply duty ratio to the motor M1 to 100% and causes the overcurrent to flow through the fuse 36 because the detected current is equal to or greater than the short determination threshold A3 that is the second threshold. Disconnect. As a result, the supply of current to the motor M1 is stopped (OFF).
Step S6
In step S6, the control device 33 stops the supply of current to the motor M1 because the detected current is smaller than the short determination threshold A3 that is the second threshold and larger than the lock determination threshold A1. .

  When the stop of the motor M1 occurs, for example, when the hair of the carpet is entangled with the rotary cleaning body 23 and the rotation of the rotary cleaning body is stopped, the hair of the carpet is removed from the rotary cleaning body 23. The motor M1 can be operated by operating the hand operation unit 17A.

  In this embodiment, the rotary cleaning body 23 provided in the suction chamber 22 is used as a rotary member, and when the drive of the rotary cleaning body 23 is stopped, the power supply to the motor M1 of the rotary cleaning body 23 is stopped or the fuse is cut. However, the present invention is not necessarily limited to this. For example, the rotating member that performs such control may be a rotating tapping member that hits the surface of a futon or the like while being rotated by a motor and lifts the dust of the futon. Further, the rotating member that performs the above-described control may be a drive wheel that is provided in the suction port body 20 and is driven to rotate by a drive motor so that the suction port body 20 travels.

  Further, as described above, the vacuum cleaner according to the embodiment of the present invention is rotatable to the suction port body 20 provided with the suction chamber 22 having the suction opening 21 on the bottom surface, and to the bottom surface or the suction chamber 22. Provided rotating member (rotary cleaning member 23, rotating tapping member, driving wheel), motor M1 for rotating this rotating member (rotating cleaning member 23, rotating tapping member, driving wheel), and current flowing in this motor M1 are controlled. Control means (control device 33) for driving the motor, a fuse 36 for cutting off the supply of current to the motor M1 at the time of disconnection, and a current detection means 34 for detecting the current flowing through the motor M1. Yes. In addition, the control means (control device 33) is configured such that the current value of the detection current detected by the current detection means 34 is a first threshold value (lock determination threshold value A1) for detecting the locked state or the overload state of the motor M1. ) And a second threshold (short determination threshold A3) for detecting a short circuit in the power supply path to the motor, the supply of current to the motor M1 is stopped, and the current value of the detected current Is equal to or greater than the second threshold (short determination threshold A3), an overcurrent is passed through the fuse 36 to cut the fuse 36, thereby stopping the supply of current to the motor M1.

  According to this configuration, for example, the fur of the carpet is entangled with the rotating member (the rotating cleaning member 23, the rotating hitting member, and the driving wheel), and the rotation of the rotating member (the rotating cleaning member 23, the rotating hitting member, and the driving wheel) is stopped. Or the current value of the detected current detected by the current detecting means 34 due to the rotation of the rotating member (rotary cleaning member 23, rotating hitting member, driving wheel) being stopped for other reasons. Are a first threshold value (lock determination threshold value A1) for detecting the locked state or overload state of the motor M1, and a second threshold value (short determination threshold value A3) for detecting a short circuit in the power feeding path to the motor. The controller (control device 33) stops the supply of current to the motor M1.

  In this case, since the motor M1 is stopped before the second threshold value (short determination threshold value A3) for detecting a short circuit of the motor M1 is exceeded, a situation in which the lead wire or the like generates heat and ignites can occur. Can be prevented. In addition, since the fuse 36 is not cut, the supply of current to the drive motor can be resumed by restarting the vacuum cleaner. The power supply path to the motor M1 includes a control circuit (not shown) in the vacuum cleaner main body 10, an operation switch portion of the hand control tube 16, a circuit (not shown) provided in the suction port body 20, and the like. Of course.

  Even if the current value of the detected current exceeds the second threshold (short determination threshold A3) due to a short circuit of the motor M1, the control means (the control device 33) causes an overcurrent to flow through the fuse 36. Since the current supply to the motor M1 is stopped by cutting the fuse 36, the safety of the motor M1 can be secured at low cost without using a posistor.

  That is, when the supply duty to the motor M1 remains 60% and a rare short of the motor M1 or a component destruction short of the control system occurs, the second threshold (short determination threshold A3) for detecting the short of the motor In some cases, the current value at which the fuse 36 is cut is not reached even if the value exceeds. If this state continues, it is possible that overcurrent will continue to flow through the control system, and the lead wire will generate heat and ignite. However, as described above, when the detected current is equal to or greater than the second threshold (short determination threshold A3), an overcurrent is passed through the fuse 36 to cut the fuse 36, thereby supplying current to the motor M1. Safety can be secured by stopping.

  By the way, after the detection current detected by the current detection unit 34 instantaneously exceeds the first threshold (lock determination threshold A1), the detection current immediately becomes lower than the first threshold (lock determination threshold A1). It is also possible to return to operation. In such a case, if the supply of current to the motor M1 is stopped and the motor M1 is stopped, the motor M1 must be restarted, which is troublesome.

  Therefore, in the vacuum cleaner according to the embodiment of the present invention, the control means (control device 33) is configured such that the detection current detected by the current detection means 34 is a first threshold value for detecting the lock of the motor M1. (Lock determination threshold value A1) and a second threshold value (short determination threshold value A3) for detecting a short circuit of the motor, and when the time between them exceeds a preset first set time, The supply of current to the motor M1 can be stopped.

  According to this configuration, when there is no need to stop the motor M1, that is, after the detected current instantaneously exceeds the first threshold value (lock determination threshold A1), the detected current immediately exceeds the first threshold value (lock determination threshold A1). When returning to normal operation at a lower level, the motor M1 is not stopped, so that the troublesome state of restarting the motor M1 does not occur.

  Further, it is also considered that the detection current immediately becomes smaller than the second threshold (short determination threshold A3) after the detection current instantaneously exceeds the second threshold (short determination threshold A3) for detecting a short circuit of the motor. It is done.

  Therefore, in the electric vacuum cleaner according to the embodiment of the present invention, the control means (control device 33) is configured to exceed the second threshold when the detected current is equal to or greater than the second threshold (short determination threshold A3). When the current time exceeds a second set time shorter than the first set time, an overcurrent is passed through the fuse 36 to cut the fuse 36, thereby stopping the supply of current to the motor M1. it can.

  According to this configuration, when it is not necessary to cut the fuse 36, the detection current immediately exceeds the second threshold (short determination threshold A3) for detecting a short circuit of the motor, and then the detection current immediately exceeds the second threshold. When the value is smaller than the threshold value (short determination threshold value A3), the fuse 36 is not cut, so that a troublesome state of replacing the fuse 36 does not occur.

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 schematic wiring diagram which showed the example of wiring from the cleaner body of FIG. 1 to a suction inlet. 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 relationship between the 2nd threshold value and a propagation flow.

Explanation of symbols

20 Suction Port 22 Suction Chamber 23 Rotating Cleaning Body 33 Control Device (Control Unit)
34 detection means 36 fuse M1 motor

Claims (2)

A suction port body having 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 are controlled. A vacuum cleaner comprising: control means for driving and controlling the motor; a fuse for cutting off the supply of current to the motor at the time of disconnection; and current detection means for detecting current flowing in 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. The supply of current to the motor is stopped when it is between the second threshold value and the fuse is blown by passing an overcurrent through the fuse when the current value of the detection current is equal to or greater than the second threshold value. The electric vacuum is characterized in that the supply of current to the motor is stopped.   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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