JPS6338553Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electric stove that is effective for two types of power supply voltages.

[Technical background of the invention]

Conventionally, in this type of electric stove, for example, if you apply a voltage of 200V to a 100V specification,
The input power is quadrupled, shortening the lifespan of the heater, and conversely
If you apply a voltage of 100V to a device with a 200V specification, the input will be reduced to 1/4 and the heating effect will be insufficient, so 100V is recommended for domestic use with a power supply voltage of 100V.
For overseas use, where the power supply voltage is 200-240V, products with 200-240V specifications were designed, manufactured and sold exclusively.

[Problems with the Background Art] However, the above-mentioned conventional technology has the problem of requiring two separate models, each of which is relatively expensive, resulting in a heavy financial burden on the user.

[Purpose of invention]

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to make it possible to use one model by skillfully switching between two types of power supply voltages, to make it inexpensive, and to make it more cost effective. The purpose of the present invention is to provide an extremely practical electric stove that can achieve this by switching between high and low strengths.

[Summary of the idea]

The present invention is characterized in that it includes a first heater and a second heater, and connects these heaters to a strength changeover switch device by means of a connection changeover switch device.

[Example of idea]

An embodiment of the present invention will be explained below with reference to the drawings. First, in FIG. 1, 1 is a housing, and 2 is surrounded by reflectors 3 and 4 of the housing A first heater installed horizontally in the lower part of the space, 5 a second heater installed horizontally in the upper part of the space, 6 a plug to be plugged into a power outlet (not shown), and 7 a plug connected to a power outlet (not shown). This is a strength/weakness switching device operated by a knob 8. As shown in FIG. 2, the strength changeover switch device 7 electrically comprises a bifurcated movable contact piece A and two stationary contact pieces B and C paired with this movable contact piece A. , the movable contact piece A is connected to one terminal 6a of the plug 6, and the fixed contact piece C is connected to the connection changeover switch device 9.
It is connected to the movable contact a of the switch 10. Here, the changeover switch device 9 also includes switches 11, 12, and 13 in addition to the switch 10, and furthermore, these switches 10 to 13 have two positions for the movable contact pieces a, d, g, and j, respectively. Fixed contact pieces b and c, e and f, h and i, k and l
The fixed contact C of the switch 10 is branched into two, one of which is connected to the movable contact G of the switch 12 via the first heater 2, and the other is shown as a voltage regulating element. It is connected to the fixed contact piece f of the switch 11 via a polar diode 14, and also to the fixed contact piece e of the switch 11.
Further, the fixed contact piece b of the switch 10 is connected to the fixed contact piece k of the switch 13, while the fixed contact piece b of the switch 10 is connected to the fixed contact piece k of the switch 13.
The fixed contact piece B of the above-mentioned strength changeover switch device 7 is connected to the movable contact piece d. And switch 12
A fixed contact piece i is connected to a fixed contact piece l of a switch 13, and a fixed contact piece h is connected to the other terminal 6b of the plug 6 via a safety switch 15 that responds to the fall of the housing 1. So, that safety switch 1
5 and the fixed contact piece h of the switch 12, the movable contact piece j of the switch 13 is connected via the second heater 5.

Therefore, in the case of the above configuration, as shown in FIG.
13, between contact pieces a and b, between de and g, respectively.
When h and j-k are closed, the first and second heaters 2 and 5 are connected to the contact piece A-B, which is the first contact point of the strength changeover switch device 7, as shown in FIG. The contact pieces A and C, which are the second contact points, are individually connected, in short, in a parallel connection state, and on the other hand, as shown in FIG. 4, switch 1 of the connection changeover switch device 9
For 0 to 13, between tangents a and c, and between d and f, respectively.
In the state where g-i and j-l are closed, the first and second heaters 2 and 5 have a diode 14 connected between contact pieces A and B of the strength changeover switch device 7, as shown in FIG. The heaters 2 and 5 are connected in series between the contact pieces A and C without the diode 14 being interposed. When the first and second heaters 2 and 5 are connected in parallel and the contacts A and B of the strength changeover switch device 7 are closed, only the first heater 2 is energized. and developed a fever,
When the contact pieces A-B and the contact pieces A-C are closed, the first heater 2 and the second heater 5 are energized and generate heat. Here, if the input when the first heater 2 is energized is W, the input when both the first and second heaters 2 and 5 are energized is twice.
It becomes 2W. On the other hand, when the first and second heaters 2 and 5 are connected in series and the contacts A and B of the strength changeover switch device 7 are closed, the first and second heaters 2 and 5 are diode 1
4, each generates heat. At this time, the input becomes W (W/2+W/2), and on the other hand, when the contact pieces A and B are closed as well as the contact pieces A and C, the diode 14 is short-circuited. Since only the first and second heaters 2 and 5 are energized and generate heat,
The input is W+W, which is 2W. By the way, since the input of the above heater is (voltage) ² /resistance, when the first and second heaters 2 and 5 are connected in parallel,
The input during "weak" operation with the contacts A and B of the strong/weak switch device 7 closed is V ² /R, where the voltage is V and the resistances of the heaters 2 and 5 are R, respectively. The input during the "strong" operation in which the contact pieces A-B and the contact pieces A-C of the strong/weak changeover switch device 7 are closed is V ² /R+V ² /R, which is 2V ² /R. On the other hand, if the first and second heaters 2 and 5 are connected in series, by applying twice the voltage as in the parallel connection state, the input during "weak" operation will be ( 2V) ² /2R x 1/2 = V ² /R, which is the same as the "weak" operation in the parallel connection state above, and on the other hand,
The input during “strong” operation is (2V) ² /2R = 2V ² /R,
Again, it is the same as the "strong" operation in parallel connection state. Therefore, when used in Japan where the power supply voltage is 100V, the connection changeover switch device 9 should be set as shown in Figure 2, while when used overseas where the power supply voltage is 200 to 240V, the connection changeover switch device 9 should be set. It is best to use the settings as shown in FIG. 4, and in either case, the same warming effect can be obtained for both the "weak" and "strong" settings.

In the above embodiment, the diode 14 is used as an example of the voltage adjusting element, but a resistor may be used instead.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but may be implemented with appropriate modifications within the scope of the gist.

[Effects of the invention] As is clear from the above, the present invention has a first and second heater, a first and a second contact, and a state in which only the first contact is closed and a state in which both contacts are closed. a strength changeover switch device provided so as to select either a state in which both are closed; and said first and second heaters individually connected to said first and second contact points of said strength changeover switch device. In the connected state, the first and second heaters are connected in series to the first contact through the voltage adjustment element, and only the first and second heaters are connected to the second contact without the voltage adjustment element. This device is equipped with a connection changeover switch device that allows you to select either the state in which the To provide an electric stove that can be used in the same way by skillfully switching between different models, can be made inexpensive because it does not particularly require two types, and can achieve excellent practical effects by being able to achieve this with a switchable type. It's something you get.

[Brief description of the drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an external perspective view, Fig. 2 is an electric circuit diagram, Fig. 3 is an equivalent circuit diagram of Fig. 2, and Fig. 4 is an equivalent circuit diagram of Fig. 2. FIG. 5 is an equivalent circuit diagram of FIG. 4, which is an electric circuit diagram in a different state. In the figure, 2 is the first heater, 5 is the second heater,
Reference numeral 7 denotes a strength changeover switch device, 9 a connection changeover switch device, and 14 a diode (voltage adjustment element).

Claims (1)

[Scope of utility model registration request] It has first and second heaters and first and second contacts, and is provided so that either a state in which only the first contact is closed or a state in which both contacts are closed can be selected. a state in which the first and second heaters are individually connected to the first and second contacts of the strength changeover switch device, and a state in which the first and second heaters are individually connected to the first and second contacts of the strength changeover switch device; Either the first and second heaters are connected in series and only the first and second heaters are connected in series to the second contact without the voltage adjustment element being connected. An electric stove comprising a connection changeover switch device.