JPH0427777B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvement of dual rated voltage equipment, and aims to prevent damage to the equipment due to erroneous voltage application.

[Conventional technology]

In recent years, as overseas travel has become commonplace, small devices with dual rated voltages that can be used both domestically and overseas have become available.
There has been an increase in accidents such as damage to equipment due to misuse of specifications, and improvements have been desired.

Most of these devices have a configuration in which the user checks the power supply voltage and manually switches the switch.
This is proposed by Publication No. 40575.

[Problem that the invention seeks to solve]

However, with this configuration, even if the user checks the power supply voltage, it is troublesome to operate the switch to any position depending on the voltage.
Due to the safety required when switching a high-voltage power supply such as 240V with a manual switch, there is a tendency for the shape to become larger.

[Means for solving problems]

The present invention has been made in view of the above points, and
A power line with a power plug to be connected to the power supply, a load circuit for low voltage power supply and a load circuit for high voltage power supply, and a load circuit for low voltage power supply and a load circuit for high voltage power supply depending on the power supply voltage. The main body is provided with a voltage switching means for switching to the main body, and the adapter plug for the power plug is attached to and detached from a part of the main body, and the voltage switching means is linked to the operation of separating the adapter plug from the main body, and the voltage switching means is in an inactive state. It can be switched to the active state in conjunction with the installation operation, and in the inactive state it connects the power line and the high voltage power supply load circuit, and in the active state it connects the power line and the low voltage power supply It is connected between the load circuit and the load circuit for use.

Even if the voltage switching means becomes inoperable due to a switching error or incomplete switching, the voltage switching means always connects the power line and the high-voltage power supply load circuit, so it cannot be used for commercial purposes. Even if the power source is a low-voltage power source such as 100V, the original performance of the device itself cannot be obtained sufficiently, but it will make you aware that there is a malfunction, and you can avoid accidents such as damage or burnout due to excessive current, and you can use it. It does not put anyone at risk, and with high-voltage power supplies such as 240V commercial power supplies, it can demonstrate its original performance and can be used as is.

Moreover, by using the attached adapter plug to perform this switching, the possibility of erroneous voltage application is eliminated without the user being aware of it.

〔Example〕

Hereinafter, the details will be explained according to examples.

Figures 1, 2, and 3 show examples of hair dryer isothermal air equipment, where 1 is a small DC motor, 2, 3, and 4 are heaters divided into multiple pieces,
5 is a manual main switch, 6 is a changeover switch as voltage switching means, 7 is an adapter plug, 8 is a main body, 9 is an adapter plug storage part provided in a part of the main body, 10 is a power plug, and 11 is the above-mentioned switch. The contact 12 of the switch is a plug blade insertion hole formed in the bottom wall of the adapter plug housing.

The heaters 2, 3, and 4 are connected in series to the power supply lines 20 and 21 when the power supply voltage is 240V, so that one end 22 of the first heater 2 is connected to the 200V power supply line through the main switch 5. The one end 23 of the third heater 4 is connected to the first switching terminal 24 of the switching switch 6, as shown by the broken line in FIG.
is connected to the power supply line 21 via the second movable contact piece 25.

In this case, the connection end 26 between the first heater 2 and the second heater 3 is connected to the second switching terminal 27 of the switching switch 6.
However, it is in an open state and is independent from the power supply lines 20 and 21.

In this way, in the case of a high-voltage power supply with a power supply voltage of 240V, the series circuit of the first heater 2 to the third heater 4 constitutes a load circuit for the high-voltage power supply.

Next, the case where the power supply voltage is 120V will be explained.
In this case, the changeover switch 6 is switched to the position shown by the solid line in FIG. Because
It is connected to one end 23 of the third heater 4 via a first switching terminal 24 . Further, the second movable contact piece 25 connects the second heater 2 and the third heater via the second switching terminal 27.
It is connected to the connection end 26 with the heater 3.

Due to this connection relationship, the second and third heaters 3,
4 and the first heater 2 are connected in parallel, and the power line 20,
21 is connected in series.

In this way, in the case of a low voltage power supply such as 120V, the series circuit of the second and third heaters 3 and 4 and the parallel circuit of the first heater 2 constitute a load circuit for the low voltage power supply.

As described above, the changeover switch 6 as a voltage switching means is composed of the first and second movable contact pieces 28, 25 and the first and second changeover terminals 24, 27, and the first and second movable contact pieces 28, 25 The contactor 11 performs movable switching.

When this contact 11 is in an inoperative state, the return spring 2
9, the second movable contact piece 25 is always urged in the direction of protruding outward, as shown by the broken line in FIG.
is connected to the first switching terminal 24, and the first movable contact piece 2
8 and the second switching terminal 27 are open, and in this inactive state, the power supply lines 20, 21 and the high voltage power supply load circuit are connected.

In the operating state in which the contactor 11 is driven from the outside, the first movable contact piece 28 and the first switching terminal 24 are connected, and the second movable contact piece 25 and the second switching terminal 27 are connected, respectively. The power supply lines 20 and 21 are connected to the low voltage power supply load circuit.

In this embodiment, a mechanically operated changeover switch 6 is used as the voltage changeover means, and is driven in conjunction with the attachment/detachment operation of the adapter plug 7.

The adapter plug 7 has one side for 120V and a shape that matches the Edison type plug blade 10' of the power plug 10, and the other side has a protruding European type plug blade 7' in the shape of a round pin, for example, which is suitable only for 240V areas. There is.

When the adapter plug 7 is inserted into the plug housing 9, the contact 11 of the changeover switch 6 is pushed by the plug blade 7' and becomes activated, and the power wires 20, 2
1 and the low voltage power supply load circuit.

When using a 240V power supply, pull out the adapter plug 7 from the plug housing 9 and the contact 1 will be removed.
1 is released, the changeover switch 6 automatically becomes inactive, and the power lines 20, 21 and the high voltage power supply load circuit are connected. A power plug 10 is a plug blade 1 that can be connected to a low voltage power source.
Since only 0' is provided, a high voltage power supply of 240V is supplied by inserting the adapter plug 7 into the removed adapter plug 7 and inserting the adapter plug 7 into a high voltage power supply.

If the selector switch 6 is activated in this way,
It can be powered by a 120V low voltage power supply, and can also be powered by a 240V high voltage power supply when inactive.

Here, if the changeover switch 6 is not activated,
For example, if you forget to attach the adapter plug 7 or if the contactor 11 of the changeover switch 6 is not driven sufficiently, it will automatically become inactive, so even if high voltage power is applied to the power plug 10, the load circuit will be in a high-voltage state. It is switched to the load circuit side for the voltage power supply, so there is no risk of burnout of the dryer itself. Of course, even if a low voltage power source is applied in this state, the performance of the dryer body will not be fully demonstrated, and a burnout accident will not occur, but a warning will be given to the user.

[Other Examples]

4 and 5 show examples of rotating equipment such as mixers, 13 is a small AC motor, and one end 31 of the winding 30 is a changeover switch 1 as a voltage switching means.
4, and the other end 33 is connected to the power supply line 21 via the main switch 15.

When using the entire winding 30 from one end 31 to the other end 33, a high voltage power supply load circuit corresponding to a high voltage power supply such as 240V is configured, and the winding from the intermediate tap 34 to the other end 33 is used. When using lines
An intermediate tap 34 constituting a low voltage power supply load circuit corresponding to a low voltage power supply such as 120V is connected to a second switching terminal 35 of the switching switch 14.
Switching between the first and second switching terminals 32 and 35 is performed by a switching movable contact piece 36 connected to the power supply line 20.

When the switching movable contact piece 36 is in the connected state with the first switching terminal 32, the switching switch 14 is in an inoperative state with the contact 11 protruding outward, as shown by the broken line in FIG. Power line 20, 2
1 and the high voltage power supply load circuit.

When the changeover switch 14 is in the operating state as shown by the solid line in FIG. 4, the power supply lines 20 and 21 are connected to the load circuit for the low voltage power supply.

As in the previous embodiment, the switching switch 14 is activated or inactivated in response to the attachment or detachment of the adapter plug 7, and if the switching switch 14 as a voltage switching means is inactivated for some reason. Even if a failure occurs, the load circuit is automatically switched to the high-voltage power supply load circuit side, thereby avoiding the occurrence of an abnormal accident.

Note that 16 is a main body, and 17 is an adapter storage portion formed in the main body.

〔effect〕

As described above, according to the present invention, a power supply line having a power supply plug to be connected to a power supply, a load circuit for a low voltage power supply, a load circuit for a high voltage power supply, and a load circuit for a low voltage power supply are connected to a power supply according to the power supply voltage. The main body includes a voltage switching means for switching between a load circuit and a load circuit for a high voltage power supply, and the adapter plug for the power plug is attached to and removed from a part of the main body, and the voltage switching means switches the adapter plug from the main body. It can be switched to be in an inactive state in conjunction with a separation operation and to be in an active state in conjunction with an attachment operation, and can be switched between the power line and the high voltage power supply load circuit in the inactive state. , since the power supply line and the load circuit for low voltage power supply are connected in the operating state, if the voltage switching means does not perform switching drive according to the power supply voltage or the switching drive is insufficient, the voltage switching means automatically The device is in an inactive state and the load circuit is always switched to the high-voltage power supply load circuit and on standby, so even if you accidentally supply power with a low-voltage power source such as 120V, the device's original performance will not be obtained. Accidents such as breakage and damage due to excessive current can be avoided, and the user can be made aware that the power source is inappropriate, and a safe device can be provided without putting the user in danger.

Moreover, since this switching is automatically performed by attaching and detaching the plug adapter to be used depending on the shape of the power outlet, accidents such as damage due to the application of overvoltage can be prevented without making the user aware of them.

In addition, by using an adapter plug, you will not lose or forget it, and since the voltage switching means is operated by the adapter plug,
There is no need to worry about tampering with the conventional method, and a portable, convenient and safe voltage switching device can be provided.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a hair dryer isothermal air device, Figure 2 is an external view of the hair dryer, Figure 3 is a partial cross-sectional view of the adapter plug housing, Figure 4 is a circuit diagram of a rotating equipment such as a mixer, and Figure 5 is a circuit diagram of a rotating equipment such as a mixer. The figure is an external view of the mixer. 2, 3, 4... Heater, 7... Adapter plug, 8, 16... Main body, 9, 17... Adapter plug storage section, 6, 14... Voltage switching means (voltage switching switch), 10... Power supply Plug, 13...AC motor, 20, 21...power line.

Claims (1)

[Claims] 1. A power line with a power plug connected to the power supply, a load circuit for low voltage power supply, a load circuit for high voltage power supply, and a load circuit for low voltage power supply and a load circuit for high voltage power supply depending on the power supply voltage. and a voltage switching means for switching to and from the main body, and the power plug adapter plug is attached to and detached from a part of the main body,
The voltage switching means is capable of switching the adapter plug into an inactive state when the adapter plug is separated from the main body, and into an active state when the adapter plug is attached to the main body. A dual rated voltage device that connects the load circuit for a high voltage power supply, and connects the power supply line and the load circuit for a low voltage power supply in the operating state.