JPH0576290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rechargeable electric appliance such as a small and lightweight rechargeable vacuum cleaner that uses a rechargeable battery as a power source.

(b) Prior Art For example, Japanese Utility Model Publication No. 38-19224 discloses a vacuum cleaner in which the suction force can be changed by switching the resistance value of a resistor using a switching tab. However, in such a conventional example, power is wasted in the resistor and the resistor itself generates heat, so a heat dissipation means is required. If the suction force changing means described above is applied to such a rechargeable vacuum cleaner, there are disadvantages in that the usage time per charge is reduced and the vacuum cleaner body becomes heavy, making it impossible to reduce its weight.

(c) Problems to be Solved by the Invention The present invention provides for rechargeable electric appliances such as rechargeable vacuum cleaners that use rechargeable batteries as a power source.
The strength of the suction force (= high/low motor rotational speed) can be switched without wasting power consumption, the heat generation of the electrical equipment itself is eliminated, and each battery can be reliably fully charged.

(d) Means for solving the problems The rechargeable electrical device of the present invention includes: (a) a first battery group and a second battery group having the same charging capacity; (b) a motor for driving a load; (c) a charging device for charging both battery groups; (d) an operating switch for switching and connecting the battery groups, the motor, and the charging device; (e) the operating switch comprises: A first state in which each battery group and the motor are connected in series to form a closed circuit, and a second state in which the motor is connected in series to a parallel circuit in which both battery groups are connected in parallel to form a closed circuit. and a third state in which the motor is interposed between each of the battery groups and connected in series with the charging device to form a closed circuit, and charging is performed in a state where the motor is not driven. It is characterized by being

(E) Operation By operating the switch, the first and second battery groups are connected in parallel or in parallel, and the motor rotation speed is switched between high and low levels, and charging of these battery groups is performed using the motor. This is done in series connection through the

(f) Embodiment 1 is a main body of a rechargeable vacuum cleaner, in which an intake port 3 is bored in the front wall 2 and a handle 4 is formed at the rear, and a rechargeable battery 5 is installed below the handle 4. A fan motor 6 is housed behind the front wall 2 with a fan 6a disposed so as to face the intake port 3. Reference numeral 7 denotes a rebound type operation switch built into the main body 1, which is opened and closed by a seesaw type operation button 8 exposed from the main body 1 near the handle 4. Reference numeral 9 denotes a charging jack provided at the rear of the main body 1 below the handle 4.

Reference numeral 10 denotes a dust collecting case connected to the main body 1 so as to cover the main body 1, and a suction port 11 is provided at the front end, and a paper filter 12 and a filter support 13 are provided.
is stored.

Reference numeral 14 denotes a charging adapter for supplying power to the rechargeable battery 5 in the main body 1, and a charging plug 16 is provided at the tip of the cord 15 to be inserted and connected to the charging jack 9 of the main body 1.

Next, in the electrical circuit diagram shown in FIG.
7 is a charging transformer housed in the charging adapter 14, and the secondary winding is connected to the positive and negative power supply terminals 19 of the charging plug 16 via a rectifying diode 18.
a, 19b. Reference numerals 20 and 21 are a first battery group and a second battery group having the same charging capacity, which constitute the rechargeable battery 5, and each have a voltage of 1.25V1200m.
It consists of two Ah nickel-cadmium batteries connected in series. Further, reference numerals 22 and 23 denote first and second switches of the always-off rebound type that constitute the operation switch 7, and the switching contacts 22c and 23c of these switches 22 and 23 are connected to the first contacts 22a and 2, respectively.
3a and the second contacts 22b, 23b, and the switching contact piece 22 is switched only while the first operation surface 8a of the operation button 8 is pressed.
c, 23c are inserted into the first contacts 22a, 23a side, and the switching contacts 22c, 23c are pressed only while the second operating surface 8b of the operating button 8 is pressed.
is applied to the second contacts 22b and 23b. 24a is a positive power receiving terminal;
The positive electrode of the battery group 21, the first electrode of the first switch 22
Contact 22a and second contact 23 of second switch 23
connected to b. 24b is a negative power receiving terminal connected to the negative electrode of the first battery group 20 and the switching contact piece 22c of the first switch 22.

The fan motor 6 has one end connected to the positive terminal of the first battery group 20 and the switching contact piece 23c of the second switch 23, and the other end connected to the negative terminal of the second battery group 21 and the switching contact piece 23c of the first switch 22. 2 contacts 2
Connected to 2b.

Therefore, since the operation switch 7 is always kept in the OFF state, that is, when the main body 1 is not in use, the first and second battery groups 20 and 21 are separated and these battery groups 2
In this state, the battery groups 20 and 21 are charged by inserting and connecting the charging plug 16 of the charging adapter 14 into the charging jack 9. At this time, a charging current also flows through the fan motor 6, but since this current is a very small amount determined by the capacity of the charging transformer 17, the fan motor 6 does not operate. 1. 2nd
It acts as a charging current limiting resistance to the battery groups 20 and 21.

Here, each battery group is charged by connecting them in series, so
A uniform charging current can be supplied to each battery group, and charging can be performed in the same state. When charging by parallel connection, the state of charge may become uneven depending on the state of the batteries (for example, differences in internal resistance values), and in more extreme cases, a large current may flow to one group of batteries. It is undesirable to charge in parallel because it has the problem of thermal runaway.

On the other hand, when the first operation surface 8a of the operation switch 7 is pressed, the first and second switches 2 are
2 and 23 are inserted into the first contacts 22a and 23a, and the first and second battery groups 20 and 21 are connected in series and power is supplied to the fan motor 6, so the fan motor 6 rotates at high speed and generates a strong suction force. can be obtained. At this time, if the charging plug 16 remains connected, the secondary winding of the charging transformer 17 will be short-circuited, but since the resistance of the secondary winding is large, no excessive current will flow, and there is no problem in practice.

Furthermore, when the second operation surface 8b of the operation switch 7 is pressed, the first and second switches 2 are
2 and 23 are inserted into the second contacts 22b and 23b, and the first and second battery groups 20 and 21 are connected in parallel and power is supplied to the fan motor 6, so the fan motor 6 rotates at a low speed and generates a weak suction force. Obtainable. At this time, if the charging plug 16 remains connected, a high voltage will be applied to the first and second battery groups 20 and 21, but since the operation switch 7 is a rebound type, if the pressure is released, the problem due to the high voltage will be resolved. This does not occur and does not adversely affect the battery groups 20 and 21.

(G) Effects of the Invention According to the present invention, the motor rotation can be switched between high speed and low speed by operating the operation switch.
Since the battery groups are switched between series connection and parallel connection, there is no needless power consumption unlike in the conventional case where resistances are switched, and it can be used for a long time with a single charge, and there is no need for heat dissipation means. Can be made lighter.

Furthermore, when not in use, a motor is interposed between the first and second battery groups, so that the first battery group, the motor,
The second battery group is connected in series and charged in this order. As a result, when charging in parallel connection, the state of charge may become uneven depending on the state of the batteries (for example, differences in internal resistance values), and in more extreme cases, a large current may flow through one group of batteries. Solving the problem of thermal runaway, the present invention uses the internal resistance of the motor as a charging current limiting resistor to ensure that each battery group is fully charged, and since it is connected in series, each battery group is charged uniformly. It is possible to supply charging current to the battery and charge it in the same state.

[Brief explanation of the drawing]

The drawings all relate to an embodiment of a rechargeable vacuum cleaner of the rechargeable electric device of the present invention, and FIG. 1 is an electric circuit diagram, FIG. 2 is a perspective view, and FIG. 3 is a cross-sectional side view. 20...First battery group, 21...Second battery group, 7
...Operation switch, 6...Fan motor, 22...
...first switch, 23...second switch.

Claims (1)

[Claims] 1 (a) a first battery group and a second battery group having the same charging capacity; (b) a motor for driving a load; and (c) a charging device for charging both battery groups. (d) an operating switch for switching and connecting the battery groups, the motor, and the charging device; (e) the operating switch connects each of the battery groups and the motor in series; a first state in which a closed circuit is formed; a second state in which the motor is connected in series to a parallel circuit in which both battery groups are connected in parallel to form a closed circuit; and a second state in which the motor is interposed between each of the battery groups. A rechargeable electric device, characterized in that it is connected in series with the charging device to form a closed circuit, and is switched between a third state in which charging is performed in a state where the motor is not driven.