JPH10103857A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the reduction of electromagnetic wave, leaked out of a refrigerator main body to the outside of the same, by providing an electromag netic wave shielding means around a cooling fan motor and a condensing fan motor to prevent the leakage of the electromagnetic wave out of the refrigerator main body. SOLUTION: A cooling fan motor 5 is installed on an air cover 2 and the main body unit of a motor is covered by an electromagnetic wave shielding box 6, prepared by laminating the permalloy of a high flux density material on one side of a high magnetic permeability cobalt series amorphous alloy foil having the thickness of 0.1-0.2 mm. The electromagnetic wave shielding material is expensive and, in this case, the box 6 is provided with a structure, covering only the generating source of electromagnetic wave or the main body of a motor. The electromagnetic wave shielding box 6 is attached to the main body unit of the motor whereby the electromagnetic wave, heretofore leaking out toward the rear side of a cabinet 1 can be reduced from 8mG to 1.6mG at a point apart from the main body of the refrigerator by 50cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator such as a refrigerator, and more particularly to a refrigerator for reducing electromagnetic waves leaking from a refrigerator body.

[0002]

2. Description of the Related Art Conventionally, as can be said for all home electric appliances, an electromagnetic wave is always generated when a current flows through electric parts constituting the electric appliance.

[0003] In a refrigerator, for example, a freezer refrigerator, which is one of home electric appliances, a compressor for compressing and sending refrigerant, a condensing fan motor for cooling the compressor and the condenser with outside air, a cooling fan motor for circulating cool air in the refrigerator, There are various electric components constituting the refrigerator, such as various heaters for preventing dew condensation, a differential heater for defrosting the evaporator, an electric damper for controlling the flow of cool air into each room, an electric circuit for controlling these, and the like. When a current flows through the components, electromagnetic waves are generated from the components.

[0004]

Recently, it has been reported that this electromagnetic wave may have an undesired effect on the human body, and interest in society has been increasing. In the case of a refrigerator, the equipment itself is continuously operated. Therefore, the electromagnetic wave is always generated from the electric components in the refrigerator, and particularly, the electromagnetic wave leaking from the motor is large.

[0005]

The refrigerator according to the present invention has solved the above-mentioned problems.
Electromagnetic wave shielding means is provided around the cooling fan motor and the condensing fan motor to prevent leakage of electromagnetic waves from the refrigerator body.

According to a second aspect of the present invention, as the electromagnetic wave shielding means of the first aspect of the invention, a high permeability material plate and a high magnetic flux density material laminated on one side thereof are used.

According to a third aspect of the present invention, the cooling fan motor or the condensing fan motor is arranged so that the direction in which the electromagnetic wave leaks most from the motor alone is directed to the longitudinal direction of the refrigerator body, and the cooling fan motor or the condensing fan motor is connected to the outside from the refrigerator body. This is to reduce electromagnetic waves leaking to the vehicle.

In the invention according to claim 4, at least one or more human body detecting means for detecting whether or not there is a person near the refrigerator is provided on the outer surface side of the main body cabinet.
The motor control means receives a signal from the human body detecting means and controls a cooling fan motor and a condensing fan motor. The human body detecting means allows the motor control means to perform cooling while a person is in the vicinity of the refrigerator. This controls the fan motor and the condensing fan motor not to operate.

Further, the invention according to claim 5 provides the invention according to claim 4.
The motor control means of the present invention receives a signal from the human body detection means that there is a person near the refrigerator, and when the state continues for a predetermined time, the cooling fan motor and the condensing fan motor Is controlled not to operate.

According to a sixth aspect of the present invention, there is provided the motor control means according to the fourth or fifth aspect, wherein:
During the period in which the cooling fan motor and the condensing fan motor are controlled so as not to operate by the signal from the human body detecting means, the temperature in the refrigerator is monitored, and when the temperature in the refrigerator reaches a predetermined temperature or higher, a buzzer is sounded. For example, a warning is issued by a notifying means to call attention to a person.

According to a seventh aspect of the present invention, the motor control means of the sixth aspect controls the cooling fan motor and the condensing fan motor so as not to operate according to a signal from the human body detecting means. In the case of continuous operation for a predetermined time, a warning is issued by a notification means such as a buzzer or the like to call attention to a person.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of a main part of a freezer showing an embodiment of a refrigerator according to the present invention. In FIG.
Cooling air obtained by heat exchange from the cooling fan motor 5
This circulates through the freezing room and other rooms to cool the inside of the refrigerator. The cooling fan motor 5 is installed on the evaporator cover 2 and has a motor body portion of 0.1 to 0.2.
It is covered with an electromagnetic shielding box 6 in which permalloy of a high magnetic flux density material is laminated on one side of a high magnetic permeability cobalt-based amorphous alloy foil having a thickness of mm. The electromagnetic wave shielding material is expensive, and has a structure in which only the motor body, which is a source of electromagnetic waves, is covered at a minimum. By adding the electromagnetic wave shielding box 6 to the motor main body, the electromagnetic wave that has leaked to the rear of the cabinet 1 in the past can be removed from the refrigerator main body by 5 mm.
What showed 8mG at a point separated by 0cm was 1.6m
G could be reduced.

FIG. 2 is a rear view of a main part of the machine room. In FIG. 2, a condensing fan motor 8 uses outside air to control a compressor 7 and a condenser installed at a bottom part on the front side of the compressor 7. Cooling. Condensing fan motor 8
Is mounted on a machine room partitioning member 13, and the motor body is covered with an electromagnetic wave shielding box 9 in which 0.1-0.2 mm thick high permeability cobalt-based amorphous alloy foil is laminated with permalloy on one side. ing. By adding this electromagnetic wave shielding box 9 to the motor main body, the electromagnetic wave that had leaked to the outside conventionally showed 7.5 mG at a point 50 cm away from the refrigerator main body, but could be reduced to 1.5 mG. .

FIG. 3 is a longitudinal sectional view of a main part of the machine room.
In the above, a shaded motor is used as the condensing fan motor 8, and a leakage magnetic field is generated in a direction partially shown in the drawing. Since the motor is installed such that the direction of the leakage magnetic field is oriented in the longitudinal direction of the refrigerator main body, there is a distance from the motor to the top surface of the refrigerator, which leads to a reduction in the leakage magnetic field to the outside. In addition, since no person touches the bottom direction, there is no influence on the human body.

FIG. 4 is a top view of a main part of the refrigerator for explaining the refrigerator according to the present invention, and FIG. 5 is a block diagram of the main part. FIGS. 4 and 5 show an ultrasonic sensor 1 for detecting a human body.
1a to 11c are installed on the back and side surfaces of the cabinet 1, respectively. The ultrasonic sensors 11a to 11c receive input signals Pi from the microcomputer 12 which controls the overall control of the refrigerator body.
Then, the ultrasonic waves are transmitted to the outside. If there is any object outside, it is partially reflected, receives the presence or absence of this reflected wave, and outputs an output signal Po to the microcomputer 12 again. Microcomputer 1
2 measures the reflection time T from the output of Pi to the reception of Po, determines the presence or absence of an object, and converts the distance to the object. Here, the method of distinguishing whether the measurement object is a person or a wall will not be described in detail, but generally, distance conversion to the object is performed a plurality of times to distinguish whether the measurement object is moving or not. The microcomputer 12 is connected to each ultrasonic sensor 11
The human body detection is sequentially performed on a to 11c, and a certain threshold (here, 1 m) is set from the refrigerator in each direction.
It is determined whether there is a person within. When it is determined that there is a person for any of the ultrasonic sensors (11c in FIG. 4), all of the ultrasonic sensors 11a to 11a
For 1c, the cooling fan motor 5 and the condensing fan motor 8 are turned off until it is determined that no one is within 1 m.

FIG. 6 is a flowchart for explaining the details of the operation. As shown in FIG. 6, the microcomputer 12 detects the presence or absence of a person near the refrigerator through the ultrasonic sensors 11a to 11c (S1). If it is determined that there is a person, the CNT1 for counting the elapsed time from this point is incremented (S2). From the value of CNT1, the normal cooling operation is continued (S5) until the state where a person is present continues for 5 seconds or more here (S3). If it is confirmed that the person stays for more than 5 seconds, the cooling fan motor 5 and the condensing fan motor 8 are turned off (S6). Thus, the above-described processing can be avoided in a case where a person simply passes by the vicinity of the refrigerator.

Here, the increment of CNT2 for counting the elapsed time from the time of turning off is started (S
7). When the off state of the fan motors 5 and 8 is continued, the temperature in the refrigerator gradually rises, which hinders the cooling operation of the conventional refrigerator. When the temperature at which the compressor 7 is turned on during the cooling operation is indicated (S8), the buzzer 15 is output (S8).
9) warn the person to leave the refrigerator,
Attempt to return to the conventional cooling operation.

Even when the value of the F thermistor 14 does not reach the ON temperature of the compressor 7, the state in which the fan motors 5, 8 are turned off from the value of the CNT2 may be 30 minutes or more. When it is confirmed (S
10) In the same manner as above, the buzzer 15 is output (S9), and a warning is urged to have a person move away from the refrigerator. Buzzer 1
The output of No. 5 is continuously output until it is determined that no one is near the refrigerator. When there are no more people, the counter modes for this process are reset (S4), and the operation returns to the normal cooling operation (S5).

Up to this point, as a human body detection sensor,
Although the case where the ultrasonic sensor is used has been described, the invention is not limited to the ultrasonic sensor, and an optical sensor, a pyroelectric sensor, or the like may be used.

The electromagnetic wave shielding means according to the second aspect of the present invention is made of a laminate of a high magnetic permeability material plate and a high magnetic flux density material, wherein the high magnetic permeability material plate is a scale-like or flake-like cobalt-based amorphous alloy piece. The insulation film about 0.1m
A layer of permalloy having a thickness of about 0.1 mm as a high magnetic flux density material is laminated on the back side of one of the insulating films of the high magnetic permeability material, using a layer laminated to a thickness of m and further covered with an insulating film. Generally, a high magnetic flux density material has high magnetic permeability, but in the case of permalloy, the saturation magnetic flux density shows a value about three times that of a cobalt-based amorphous alloy piece. In particular, the synergistic effect of a cobalt-based amorphous alloy piece with good shielding properties against low-frequency magnetic fields and permalloy with a high saturation magnetic flux density, and the effect of multi-layering, that is, the magnetoresistance due to an insulating film between two magnetic material layers An electromagnetic wave can be effectively shielded by the effect that the magnetic flux does not easily leak outside due to the presence of the layer having a large diameter.

[0022]

According to the refrigerator of the present invention having the above-mentioned structure, the invention according to claim 1 performs electromagnetic wave shielding for a motor which leaks the largest electromagnetic wave among electric components constituting the refrigerator. Thus, electromagnetic waves leaking from the refrigerator body to the outside can be reduced.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the shielding property is improved by laminating a high magnetic flux density material, the same property as that without the lamination is maintained. In this case, the shape can be reduced.

According to a third aspect of the present invention, in a motor having the largest leaking electromagnetic wave among the electric components constituting the refrigerator, the direction of the largest leaking electromagnetic wave from the motor alone is set in the longitudinal direction of the refrigerator body. Therefore, electromagnetic waves leaking to the outside are reduced.

According to the fourth aspect of the present invention, the motor that leaks the largest electromagnetic wave among the electric components constituting the refrigerator is controlled so that it does not operate when a person approaches the refrigerator body. Therefore, the influence on the human body can be eliminated.

Further, the invention described in claim 5 is the same as claim 4
In addition to the effects of the invention described above, simply passing a person in the vicinity of the refrigerator body does not turn off the fan motors, so that the cooling operation of the refrigerator is not affected.

Furthermore, the invention according to claim 6 has the effect of the invention described in claim 4 or claim 5, in addition to the effect of the invention, even when the state in which each fan motor is controlled not to operate is continued. When the temperature of the refrigerator reaches a predetermined temperature, a buzzer is sounded to warn a person, and the influence on the cooling operation inherent in the refrigerator can be minimized.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, since a buzzer is issued and a warning is urged even from the continuous time when each fan motor is turned off, the thermistor or the like is used. In the event of a failure, it is possible to return from this process to a normal cooling operation, leading to an improvement in the reliability of the refrigerator.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of a freezer compartment of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a rear view of a main part of a machine room of the refrigerator according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part of a machine room of the refrigerator according to the embodiment of the refrigerator of the present invention.

FIG. 4 is a main part top view of the refrigerator of the refrigerator according to the embodiment of the present invention;

FIG. 5 is a block diagram of a main part of a refrigerator according to an embodiment of the present invention.

FIG. 6 is a flowchart illustrating an example of the operation of the refrigerator-freezer according to the embodiment of the refrigerator of the present invention.

[Explanation of symbols]

 Reference Signs List 3 evaporator 4 differential heater 5 cooling fan motor 6, 9 electromagnetic wave shielding box 7 compressor 8 condensing fan motor 10 condenser 11a, 11b, 11c ultrasonic sensor 14 F thermistor

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Atsuko Sakai 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka

Claims (7)

[Claims] 1. A refrigerator comprising a motor such as a cooling fan motor for circulating cool air in a refrigerator, a condensing fan motor for cooling a compressor and a condenser in a machine room, and an electromagnetic wave shielding means for shielding electromagnetic waves leaking from the motor. Refrigerator characterized in that electromagnetic waves are not leaked from the refrigerator body. 2. A refrigerator according to claim 1, wherein said electromagnetic wave shielding means comprises a high permeability material plate and a film made of a high magnetic flux density material laminated on one side of said high permeability material plate. . 3. A refrigerator comprising a motor such as a cooling fan motor for circulating cool air in a refrigerator and a condensing fan motor for cooling a compressor and a condenser in a machine room, wherein the direction in which electromagnetic waves leak most from the motor alone is the refrigerator. A refrigerator having the motor installed so as to face the longitudinal direction of the main body. 4. A refrigerator equipped with a cooling fan motor for circulating cool air in a refrigerator, a condensing fan motor for cooling a compressor and a condenser in a machine room, and the like, a human body detecting whether a person is present near the refrigerator or not. At least one unit is provided on the outer surface side of the main body cabinet, and a motor control unit that controls the cooling fan motor and the condensing fan motor in response to a signal from the human body detection unit,
During the first state in which the human body detecting means determines that there is a person near the refrigerator, the motor control means has a second state in which the cooling fan motor and the condensing fan motor are controlled so as not to operate. Refrigerator to feature. 5. The motor control means, when the first state continues for a predetermined time, a cooling fan motor,
And the second controlling the condensing fan motor not to operate
The refrigerator according to claim 4, wherein the refrigerator shifts to a state. 6. The motor control means includes a notifying means for monitoring the internal temperature during the second state and issuing a warning by a buzzer or the like when the internal temperature reaches a predetermined temperature or higher. A refrigerator according to claim 4 or claim 5, characterized in that: 7. The refrigerator according to claim 6, wherein the motor control means has a notification means for issuing a warning by a buzzer or the like when the second state continues for a predetermined time.