JPH0724641B2 - Rechargeable vacuum cleaner - Google Patents

Description

The present invention relates to a rechargeable vacuum cleaner that uses a rechargeable battery as a power source and is equipped with an operation display lamp.

(B) Prior Art A rechargeable vacuum cleaner having an operation display lamp is known (see Japanese Utility Model Laid-Open No. 58-160555). In addition, a battery type vacuum cleaner in which the suction air volume is switched by a changeover switch is also known (Shokai Sho 60-67).
However, if such a changeover switch is used in the above-mentioned rechargeable vacuum cleaner, the voltage value applied to the operation indicator lamp will change depending on whether the changeover switch is strong or weak, and the brightness of the lamp will change. There is a fear that will change. In particular, when the operation display lamp is also used for informing the charging time, the lamp is turned off and the charging time is displayed even if the vacuum cleaner can be used, thus confusing the user.

(C) Problems to be Solved by the Invention According to the present invention, even if the suction voltage is changed by changing the power supply voltage to the fan motor by changing the combination state of the rechargeable batteries, the operation display lamp lights up with the same brightness. It is therefore an object of the present invention to provide a rechargeable vacuum cleaner in which the use is informed and the charging time is accurately informed by turning off the lamp.

(D) Means for Solving Problems The rechargeable vacuum cleaner of the present invention switches the connection state of the rechargeable first and second battery groups, the fan motor, and the first and second battery groups. A rechargeable vacuum cleaner having a changeover switch, and changing the changeover switch to connect the first and second battery groups in series or in parallel to change the power supply voltage to the fan motor. A series circuit of a switching element and an operation indicator lamp is connected in parallel with the battery group, and a control pole of the switching element is connected to the fan motor through a rotation detection circuit of the fan motor, and this switching is performed during charging. It is characterized in that the operation indicator lamp is energized by bypassing the element.

(E) Action The series connection of the first battery group and the second battery group can be changed by switching the switch, and the rotation speed of the fan motor can be switched. On the other hand, since the operation display lamp is turned on by using only the first battery group as a power source, the brightness does not change even if the rotation speed of the fan motor is changed by switching the connection between the first battery group and the second battery group. Further, when the battery voltage decreases and the rotation speed of the fan motor decreases, the counter electromotive force of the fan motor decreases and the operation display lamp goes out, so that the charging time can be known.

On the other hand, at the time of charging, since the operation indicator lamp is energized by bypassing the switching element, the operation indicator lamp is always lit regardless of the battery voltage. Therefore, this operation display lamp can be used also as the display lamp during charging.

(F) Example (1) is a rechargeable vacuum cleaner according to the present invention, which has a dust collecting recess (3) which can be opened and closed by a lid (2) at the front part of the main body, and the dust collecting recess ( 3) has a filter device (not shown) detachably housed therein and a suction port (4) at the front end. The main body has a handle (5) at the rear, a fan motor (6), and six 1.2V1300mAh rechargeable batteries (7a) to (7).
f), an electrical board (not shown) is housed, and a slide switch (8) is housed with its operation knob (8a) exposed on the upper surface of the main body. The operating knob (8a) slides to the "strong" position, the "medium" position, the "weak" position, and the "off" position as shown in FIG. Further, (9) is a diode which is issued as an operation lamp, which is turned on during use of the vacuum cleaner and turned off when the charging time comes to notify the user, and is also turned on during charging to notify the user.

FIG. 1 is an electric circuit diagram. In the figure, (10) is a charging adapter, which is a commercial power source (11) to a step-down transformer (12),
Positive and negative power supply terminals (14
Power is supplied to a) and (14b). Further, (15) is a main body circuit portion incorporated in the main body of the vacuum cleaner (1), (16) is a first battery group including three secondary batteries (7a) to (7c), and (17) is A second battery group in which two secondary batteries (7d) (7e) and one secondary battery (7f) are connected in series, (6)
Is the fan motor, (18a) and (18b) are positive and negative charging terminals, and (19) is a second rectifying diode. Reference numeral (8) is the slide switch, which has two circuits and five contacts, and the common contact piece (20a) of the first and second switching circuits (A) and (B) is provided by sliding the operation knob (8a). ) (2
0b) are fixed contacts (21a) to (25a) and (21b) to (2
It is configured to slide so that two adjacent fixed contacts in 5b) are sequentially connected. And the first switching circuit (A)
The second contact (22a) of the battery is connected to the two batteries (7d) (7e) and 1
At the connection point with the battery (7f), the third contact (23a) is the first contact (21b) of the second switching circuit (B), the second rectifier diode (19) and the first battery group ( At the connection point of 16), the fourth contact (24a) is connected to the fan motor (6) and the second battery group (1).
7) is connected to the connection point with one rechargeable battery group (7f), and the second and third contacts (22) of the second switching circuit (B) are connected.
b) and (23b) are the negative charging terminal (18b) and the second battery group (1
7) at the connection point with the two rechargeable batteries (7e) and (7d), the fourth contact (24b) at the connection point between the battery group fan motor (6) and the first battery group (16), Each is connected.

Further, (26) is a rotation detection circuit of the fan motor (6) consisting of a switching transistor (27) and a base resistor (28), and the collector terminal of the transistor (27) is connected to the positive electrode of the first battery group (16) and the base. The resistors (28) are respectively connected to the fan motor (6) so that the transistor (27) is turned on when the fan motor (6) rotates. The transistor (27) may be replaced with a fat interrupter.

Further, (29) is a voltage sensor circuit connected in series to the output circuit of the rotation detection circuit (26), and the transistor (27)
The light emitting diode (30) connected to the emitter terminal of the
And a current limiting resistor (31) connected to the negative electrode of the first battery group (16), the current limiting resistor (31) having a voltage value of 2.4 V in the first battery group (16). The resistance value is adjusted so that the light emitting diode (30) sometimes goes out. Therefore, when the fan motor (6) rotates, the transistor (27) of the rotation detection circuit (26) turns on and the voltage sensor circuit (29).
The light emitting diode (30) of the first battery group (16) is turned on by the 3.6V power source of the three rechargeable batteries (7a) to (7c) to evaluate the operation. When the voltage of 16) drops to 2.4V, which is the voltage that requires charging due to the power consumption of the fan motor (6), the lamp is turned off to notify that it is the charging time. Furthermore, (32) is the positive charging terminal (18a) and the second
A backflow prevention diode connected between the connection point of the rectifier diode (19) and the connection point of the transistor (27) and the light emitting diode (30). I am supposed to do it.

When the operation knob (8a) is set to the "strong" position, the first contacts (21a) (21b) of the first and second switching circuits (A) and (B) become the second contacts (22a) (22b). To the first and second, respectively.
Six batteries (7a) to (7f) of the battery group (16) (17) are connected in series to supply power to the fan motor (6), the fan motor (6) rotates at high speed, and the dust collecting power is maximized. Then, it strongly inhales dust on the carpet where it is difficult to collect it. Next, set the operation knob (8a) to the "middle" position, and the second contact (22a)
(22b) is connected to the third contacts (23a) and (23b) respectively, and the three batteries (7a) to (7c) of the first battery group (16) are connected,
A single battery (7f) of the second battery group (17) is connected in series to supply power to the fan motor (6), and the fan motor (6) rotates at a slightly lower speed than the above and the dust collection power becomes standard. It efficiently inhales dust from standard places such as tatami mats. Next, set the operation knob (8a) to the "weak" position and the third contact (23
a) (23b) is connected to the fourth contact (24a) (24b) respectively, the first and second battery groups (16) (17) are connected in parallel, and the fan motor (6) rotates at a lower speed. As a result, the dust collecting power is minimized, and dust in a place such as on a table cloth is reliably sucked in without sucking the table cloth, and the usage time is doubled. The light emitting diode (30) lights up at the same brightness at each of the "strong", "medium", and "weak" positions, and when the battery voltage further decreases and the rotation speed of the fan motor (1) drops, the fan motor The decrease in back electromotive force is transmitted to the base of the transistor (27) through the rotation detection circuit, the transistor is cut off, the light emitting diode is turned off, and the user is notified of the charging time. Next, when the operation knob (8a) is set to the "OFF" position, the fourth contact points (24a) (24b) are connected to the fifth contact points (25a) (25b), respectively.

In this state, since the fan motor (6) is not supplied with power, the rotation is stopped, but when the charging terminals (18a) (18b) are connected to the power supply terminals (14a) (14b), the first battery group is connected. (16) and the second battery group (17) are connected in series via the fan motor (6) to be charged. At this time, since the charging current is significantly lower than the rotation driving current of the fan motor (6), the fan motor (6) does not rotate. At this time, a current flows through the diode (32) to the light emitting diode (30), which lights up to notify that charging is in progress.

(G) Effect of the Invention According to the present invention, the rotation speed of the fan motor is changed without wasteful power consumption by changing the connection state of the first battery group and the second battery group, and it is possible to collect the output according to the floor surface and dust. It is possible to obtain dust power, and the operation display lamp lights up at the same brightness regardless of the dust collection power, and the charging time can be accurately known by turning off this lamp.

On the other hand, at the time of charging, since the operation indicator lamp is energized by bypassing the switching element, the operation indicator lamp is always lit regardless of the battery voltage. Therefore, this operation display lamp can be used also as the display lamp during charging.

[Brief description of drawings]

Each of the drawings relates to an embodiment of the rechargeable vacuum cleaner of the present invention,
FIG. 1 is an electric circuit diagram, FIG. 2 is an overall perspective view, and FIG. 3 is an enlarged view of a main part. (7a) to (7f) …… Rechargeable battery, (6) …… Fan motor, (30) …… Light emitting diode, (29) …… Voltage sensor circuit, (26) …… Rotation detection circuit.

Claims (1)

[Claims] 1. A rechargeable first and second battery group, a fan motor, and a changeover switch for changing over the connection state of the first and second battery groups, and the changeover switch is changed over for the first and second changeover switches. In a rechargeable vacuum cleaner in which a power supply voltage to the fan motor is variable by connecting a second battery group in series or in parallel, a series circuit of a switching element and an operation indicator lamp in parallel with the first battery group. And the control pole of the switching element is connected to the fan motor through the rotation detection circuit of the fan motor, and at the time of charging, the switching element is bypassed to energize the operation indicator lamp. Rechargeable vacuum cleaner that does.