JPH0122611Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a vacuum cleaner in which the input of a fan motor is controlled by a thyristor comprising a bidirectional control rectifying element or the like to adjust the suction air volume.

B. Prior Art Conventionally, this type of vacuum cleaner controls the power of the fan motor by controlling the trigger phase and the conduction angle by the trigger timing of the thyristor that controls the input of the fan motor, and adjusts the suction air volume. ing.

In such a circuit configuration, the temperature of the thyristor increases due to the power loss of the thyristor itself. Particularly in the case of vacuum cleaners, the current is large, so in order to use the thyristor within the permissible temperature range, the thyristor must be installed in front of the exhaust side of the fan motor.

For this reason, conventionally a thyristor was installed between the dust collection part (filter part) of the vacuum cleaner body and the suction port of the fan motor, but due to limited storage space, only the thyristor was installed.
Because the control unit was installed in a separate location, the configuration was extremely complex and the electrical wiring was troublesome (Jikkoaki).
51-32294).

C. Purpose of the invention This invention improves the performance of the thyristor, downsizes the heat sink, and simplifies the configuration of the control unit by forcing airflow to flow through the connecting pipe of the hose connected to the vacuum cleaner body. The purpose is to

D. Structure of the invention The present invention provides a vacuum cleaner in which a floor suction device is connected to a vacuum cleaner body having a built-in fan motor via a hose having a suction pipe and a connecting pipe, in which a part of the connecting pipe or The entire fan is made of metal, and a heat dissipation part of a thyristor that controls the input of the fan motor is fixed to the metal part.

E. Embodiments Hereinafter, embodiments of the present invention shown in the drawings will be described.

Reference numeral 1 denotes a vacuum cleaner body, which includes a dust collecting section (not shown) and a fan motor 2. 3 is a floor suction device connected to the suction port of the cleaner main body 1 via a flexible hose 6 having an extensible suction pipe 4 and a bendable connecting pipe 5. The bent connecting pipe 5
is made of metal and fat, and the connecting portion with the flexible hose 6 is covered with a cover 7.

Reference numeral 8 denotes a control circuit section disposed between the pipe wall 9 of the straight section of the bent connecting pipe 5 and the casing member 10 via an insulating sheet 11, and the circuit section is wound around the flexible hose 6. The attached two core wires 12,
It is connected to the fan motor 2 in the vacuum cleaner main body 1 and an external power source via 12.

The control circuit section 8 is composed of a printed circuit board 13, a thyristor 14 mounted on the board, and other circuit components, and the heat dissipation section 15 of the thyristor 14 is tightly fixed to the pipe wall 9 of the connecting pipe 5 with screws 16. has been done. Reference numeral 17 denotes an operating knob of a variable resistor 18 constituting a part of the circuit component, which protrudes from the side slit 19 of the casing member 10.

FIG. 4 is a circuit wiring diagram.

The fan motor 2 is connected in series with a thyristor 14. A series circuit of a capacitor 20 and a variable resistor 18 is connected in parallel to the thyristor 14, and a trigger diode 22 is connected between the midpoint between the capacitor 20 and the variable resistor 18 and the gate pole 21 of the thyristor 14. has been done.

In the above embodiment, the air volume adjustment operation knob 1 provided on the casing member 10 of the bent connecting pipe 5
7 to adjust the variable resistor 18, the phase change of the gate circuit is applied to the gate pole 21 via the trigger diode 22, and the conduction angle of the thyristor 14 changes. This change in the conduction angle changes the average amount of current flowing through the thyristor 14, allowing the input to the fan motor 2 to be controlled and the air volume to be adjusted.

In such a state, the current flowing through the thyristor 14 is a large current, and a voltage drop occurs in the thyristor 14, so a power loss corresponding to the product of the current and the voltage drop occurs and is lost as heat. .

Since the heat dissipation plate 15 of the thyristor 14 is closely fixed to the metal connecting pipe 5, it is forcibly cooled by the airflow flowing through this pipe.

F. Effect of the invention Since the invention is constructed as described above,
Since the metal connecting pipe acts as a heat sink and air flows through it, a sufficient cooling effect is obtained, and there is no noise and no dirt clogging. Furthermore, the control section can also be gathered in one place.

Therefore, a sufficient cooling effect can be obtained with a very simple configuration.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a vacuum cleaner equipped with the proposed device, Fig. 2 is an enlarged view of the main part of Fig. 1, and Fig. 3 is an explanatory diagram of a vacuum cleaner equipped with the proposed device.
The main part of the figure is a sectional view, and FIG. 4 is a circuit connection diagram. 1...Vacuum cleaner body, 2...Fan motor, 5...
...Metal connection pipe, 8...Control circuit section, 14...
...thyristor, 15...heat dissipation section.

Claims (1)

[Scope of utility model registration request] In a vacuum cleaner in which a floor suction device is connected to a vacuum cleaner body having a built-in fan motor via a hose having a suction pipe and a connecting pipe, a part or all of the connecting pipe is formed of metal, and the connecting pipe is made of metal. A power control device for a vacuum cleaner, characterized in that a heat radiation part of a thyristor for controlling input to the fan motor is fixed to a metal part.