JPH0544708Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to electric refrigerators, and more specifically, when the door of the freezer compartment is opened, the motor of the fan installed in the freezer compartment is controlled to stop. It concerns electric refrigerators.

[Conventional Example] FIG. 4 shows a conventional example of a two-door electric refrigerator. That is, in the same figure,
The electric refrigerator 1 has a freezer compartment 2 and a refrigerator compartment 3 separated by a partition wall 1a, and each compartment has a door 2.
a, 3a are provided. Inside the freezer compartment 2, there is a fan 4 for circulating cold air and a heater 5 (fifth heater) for defrosting.
) etc. shown in the figure are arranged at predetermined positions. The freezing chamber 2 is controlled by, for example, a circuit shown in FIG. That is, the opening/closing of the door 2a is detected by a micro switch 6, and the motor 7 of the fan 4 in the freezer compartment 2 is controlled to rotate or stop by turning the microcomputer 6 ON or OFF. While the door 2a of the freezer compartment 2 is open, the rotation of the motor 7 of the fan 4 is stopped to prevent cold air from escaping, and when the door 2a is closed, the rotation of the motor 7 of the fan 4 is stopped to prevent cold air from escaping. ,
The motor 7 is rotated to circulate cold air into the freezer compartment.

Furthermore, a commercial AC power source 12 is applied to the heater 5, the motor 7 of the fan 4, and the compressor 8 via relay circuits 9, 10, 11. The microswitch is turned on and off by a signal from the control circuit 13.

[Problems to be solved by the invention] By the way, the micro switch 6 for detecting the opening/closing of the door 2a is arranged at a position where it is turned on and off in relation to the opening/closing of the door. Relay circuit 11 for controlling rotation/stopping
The control circuit 13 and the like are provided at a location away from the micro switch 6. Further, the fan 4, heater 5, etc. are often located away from the relay circuits 9, 10, 11 and the control circuit 13. Therefore, in the manufacturing process, the number of wirings inevitably increases, manufacturing time is required, and costs cannot be reduced. Furthermore, since the AC power supply 12 is directly applied to the microswitch 6, it is necessary to use one with a high withstand voltage, which increases the cost.

On the other hand, with the recent development of microcomputers, electric refrigerators that can perform various controls using the microcomputers have been proposed. However, as mentioned above, since the opening/closing of the door 2a is detected by the micro switch 6, etc., noise may be caused when the micro switch 6 is switched, and the connection line between the micro switch 6 and the control board (not shown) may be generated. It is difficult to obtain accurate signals due to noise etc. Therefore, it is necessary to remove such noise and obtain accurate ON/OFF signals, which inevitably increases the cost.

This idea was created in view of the above-mentioned problems, and its purpose is to provide an inexpensive electric refrigerator that can be controlled by a microcomputer while reducing the time and cost of the manufacturing process.

[Means for Solving the Problems] In order to achieve the above object, this invention includes a refrigerator compartment and a freezing compartment separated by a partition wall, and in connection with opening and closing of the door of the freezing compartment, In an electric refrigerator that controls rotation and stop of a fan motor installed indoors, a magnetic member attached to one side of the door of the freezer compartment and the magnetism of the magnetic member are detected to control the rotation of the door of the freezer compartment. A magnetic sensor that outputs a detection signal corresponding to opening/closing, and a microcomputer as a control device that controls rotation/stop of the motor of the fan based on the opening/closing detection signal, the magnetic sensor and the microcomputer Both are integrally mounted on the same electronic circuit board, and the magnetic sensor is disposed within the partition wall so as to face the magnetic member.

[Example] Hereinafter, an example of this invention will be described based on FIGS. 1 to 3. In the figure, the same parts as in FIGS. 4 and 5 are denoted by the same reference numerals, and redundant explanation will be omitted.

In the figure, a magnetic member 15 is attached to the lower side surface of the door 2a of the freezer compartment. This magnetic member 1
5 is a sheet (magnetic sheet) made of, for example, a magnet, and is designed to be easily attached. A magnetic sensor 16 is disposed within the partition wall 1a of the electric refrigerator 1 below the door 2a at a position that detects the magnetism of the magnetic member 15 when the door 2a is closed. In addition, this magnetic sensor 1
An electronic circuit board 17 such as a control circuit (microcomputer) 14 shown in FIG. 3 is disposed within the partition wall 1a of the electric refrigerator 1, where 6 is disposed. Note that the magnetic sensor 16 is integrally attached to the electronic circuit board 17.

The motor 7 of the fan 4 is connected to the relay circuit 11.
AC power source 9 is applied when the micro switch is turned on. For this purpose, the detection signal of opening/closing of the door 2a obtained by the magnetic sensor 16 is input to the control circuit 14, and the control circuit 14 turns on the micro switch of the relay circuit 12 based on the closing detection signal. It's getting old. That is, in this invention, the opening and closing of the door 2a is magnetically detected by a magnetic sensor 16 instead of the microcomputer 6 (shown in FIG. 5). Therefore, not only the installation of the micro switch 6, but also the wiring between the micro switch 6 and the motor 7 of the fan 4, and the wiring between the micro switch 6 and the AC power supply 12 are eliminated, and the manufacturing process for such wiring is omitted. It is now possible to do so. Also, door 2
Since the opening/closing of a is detected magnetically, there is no need to consider processing such as noise generated by the micro switch 6 when extracting the opening/closing signal, making it possible to easily use a microcomputer as the control circuit 14. ing.

Next, the control operation of the freezer compartment of the electric refrigerator having the above configuration will be explained.

First, when the door 2a of the freezer compartment 2 of the electric refrigerator 1 is opened, the magnetic member 15 moves away from the magnetic sensor 16, and when the magnetic sensor 16 no longer detects the magnetism, the magnetic member 15 moves away from the magnetic sensor 16. An open detection signal is input to the control circuit 14. Then,
The control circuit 14 outputs a control signal to turn off the micro switch of the relay circuit 11, and the rotation of the motor 8 of the fan 4 is controlled to stop.

Subsequently, when the door 2a is closed, the electromagnetic member 15 approaches the magnetic sensor 16, and comes closest when the door 2a is completely closed, so that the magnetic sensor 16 detects the magnetism, and the electromagnetic member 15 approaches the magnetic sensor 16. A closed detection signal is input to the control circuit 14 in response to the detection. Then, from the control circuit 14, the relay circuit 11
A control signal that turns on the micro switch is output, and the motor 8 of the fan 4 is controlled to rotate as desired.

In this way, a microcomputer can be used for control, and load control associated with opening and closing of the door 2a,
For example, the defrosting timing can be arbitrarily controlled according to the frequency of opening and closing of the door 2a.

[Effects of the invention] As explained above, according to this invention, a magnetic sensor is used instead of a mechanical microswitch to detect the opening and closing of the freezer compartment door, and the magnetic sensor and a control device are used together. By mounting both the microcomputer and the microcomputer on the same electronic circuit board and placing them inside the partition wall,
Noise is not generated due to switch switching, and the wiring work is greatly simplified.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of an electric refrigerator showing an embodiment of this invention, Fig. 2 is a schematic external view of the electric refrigerator, Fig. 3 is a block diagram of the freezer compartment control of the electric refrigerator, and Fig. 4. 5 is a partial sectional view of a conventional electric refrigerator, and FIG. 5 is a block diagram of the freezer compartment control of the conventional electric refrigerator. In the figure, 1 is an electric refrigerator, 2 is a freezer compartment, 2a, 3
a is the door, 3 is the refrigerator compartment, 4 is the fan, 5 is the heater,
6 is a micro switch, 7 is a motor, 8 is a compressor, 9, 10, 11 are relay circuits,
12 is an AC power supply (commercial), 13 is a control circuit, 14
is a control circuit (microcomputer), 15 is a magnetic member (magnetic sheet), 16 is a magnetic sensor, 17
is the control circuit board.

Claims (1)

[Scope of claim for utility model registration] Includes a refrigerator compartment and a freezer compartment separated by a partition wall, and rotates and stops the motor of a fan installed in the freezer compartment in connection with opening and closing of the door of the freezing compartment. The electric refrigerator to be controlled includes: a magnetic member attached to one side of the door of the freezer compartment; a magnetic sensor that detects magnetism of the magnetic member and outputs a detection signal in accordance with opening/closing of the door of the freezer compartment; and a microcomputer as a control device that controls rotating and stopping the motor of the fan based on the open/close detection signal, and the magnetic sensor and the microcomputer are both integrally mounted on the same electronic circuit board. An electric refrigerator characterized in that the magnetic sensor is disposed within the partition wall so as to face the magnetic member in a state where the magnetic sensor is in a state where the magnetic sensor is placed in the partition wall.