JPS5971970A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the control of a forced draft refrigerator having a Noan motor for cooling the condenser and a fan motor for cooling the inside of the refrigerator.

2z.

In conventional forced draft refrigerators, the fan motor for cooling the condenser and the fan motor for cooling the inside of the refrigerator are selected based on high-load conditions in which the outside air is hot and humid and the door is opened and closed frequently. Therefore, from the viewpoint of low-load conditions such as when the outside temperature is low or when the number of door openings and closings is small, motors that are larger than necessary are selected for both of the fan motors.

Therefore, the present invention provides switching terminals that can reduce the rotation speed of the condenser cooling fan motor and the compartment cooling fan motor, which are selected under high load conditions, to reduce the rotation speed of both fan motors during low load conditions. The aim is to reduce noise from refrigerators.

An embodiment of the present invention will be described below with reference to the drawings. 1
The interior of the refrigerator is divided into two chambers, and two outer doors are installed at the front openings of these two chambers.
. 8 is a cooler, compressor 9
．． The condenser 10 and the capillary ceiling 11 are arranged in sequence to form a cooling system 37. 12 is a fan motor for cooling the condenser, and as shown in FIG. 4, it has a switching terminal 12B designed to reduce the rated rotation speed based on high load conditions. 1
Reference numeral 3 denotes a partition plate provided at the back of the freezing chamber 4, which partitions the freezing chamber 4 and the cooler 8 to form a cooling chamber 14.

Reference numeral 15 denotes a fan motor for cooling the inside of the refrigerator, and as shown in FIG. 4, it has a switching terminal 15B for reducing the rotation speed similarly to the fan motor for cooling the condenser. Reference numeral 16 denotes a discharge cover for the freezer compartment, which controls the amount of air blown to the air duct 17 that communicates the freezer compartment 4 and the refrigerator compartment 5. The cooling air cooled in the cooling chamber 14 is forcibly ventilated into the refrigerator compartment 6 via the freezer compartment 4 and the ventilation duct 17 by the internal cooling fan motor 15 as shown by the arrow in FIG. The cooling air that has circulated through both chambers 4 and 5 is then transferred to the suction port 1 of the freezing chamber 4, which communicates with the cooling chamber 14.
8 and the cooling room 1 again via the suction ventilation duct 19 of the refrigerator compartment 5.
Both the chambers 4 and 5 are cooled to a predetermined temperature by a circulating action such as returning to the chamber 4. 2o is a temperature controller,
As shown in FIG. 4, the compressor 9. It controls the condenser cooling fan motor 12 and the interior cooling fan motor 15 to cool the inside of the freezer compartment 4 to a predetermined temperature. Reference numeral 21 denotes a damper thermostat, which adjusts the amount of cooling air blown from the ventilation duct 17 by automatically opening and closing a damper to cool the inside of the refrigerator compartment 5 to a predetermined temperature. Reference numeral 22 denotes a temperature sensor used to change the rotation speed of the fan motor for cooling the inside of the refrigerator.As shown in FIG. In order to avoid being affected by the low temperature of the cooler 8, a heat insulating material 24 is interposed between the cooler 8 and the partition plate 13, and a non-conducting mounting plate 25 is used to install it on the partition plate 13. The temperature is set to be the same as the temperature of the load in 4. Reference numeral 26 denotes a temperature sensor for changing the rotation speed of the condenser cooling fan motor, which is mounted in close contact with the outlet vibrator of the condenser 10 so that the condensing temperature can be detected.

The electrical wiring diagram of the present invention will be explained with reference to FIG. A temperature regulator 2o is arranged in series with both the fan motors 12, 15. and controls the operation of the compressor 9. A rated terminal 12A is provided at one end of both terminals of the condenser cooling fan motor 12 and the compartment cooling fan motor 5, respectively.
, 1 Switching terminal 12 where rsA and rotation speed are switched
B, 15B are provided, and both the fan motors 12.15
Normally closed terminal 2 of switch 27 and 28 to change the terminal of
At 9.30, the switching terminals 12B and 1 of both motors were connected.
sB to the normally open terminals 31 and 32 of the rated terminals 12A of both said motors.

15A is connected. 33 is a coil that operates the changeover switch, and is arranged in series with the temperature detector 26 that detects the condensation temperature. 34 is a coil that operates the changeover switch 27, and is arranged in series with the temperature detector 22 that detects the temperature inside the refrigerator.

Next, the operation of this configuration will be explained.

Normally, when the load on the refrigerator is small, for example when the outside air temperature is low or when the door is not opened or closed, the temperature of the refrigerator compartment 4 is kept low and the condensation temperature is also low.

67. -- At this time, temperature detectors 22 and 26 are open,
The changeover switches 27 and 28 have normally closed terminals 29 and 30, respectively.
Since the contacts are connected to the side, the condenser cooling fan motor 12. The internal cooling fan motor 15 is connected to the switching terminal 12
B, 15B is used to control luck.

Switching terminals 12B and 15B are 20% of the rated air volume.
It is usually operated with low noise because it is operated at a rotation speed with a relatively small air volume. Next, when the refrigerator load is heavy, for example when the outside air temperature is high and the condensing temperature rises,
When the temperature inside the freezer compartment 4 rises above a predetermined temperature due to violent opening and closing of the door, the temperature detectors 26 and 22 are closed.

Then, the changeover switch 27.28 is switched to the normally open contact 31.32 side by the coil 33.34, and the condenser cooling fan motor 12 and the interior cooling fan motor 16 are operated through the rated terminals 12A and 1tsA. Since the rated air volume of the rated terminals 12A and 15A is designed based on high loads, it is possible to maintain the same cooling performance as before even under high loads by 7 bezos. When the load decreases and the condensing temperature falls below a predetermined temperature, the temperature detector 26 is opened and the selector switch 27 is switched to the normally closed terminal 29 side, and the switch terminal 12B, which has a low rotation speed, is switched again.
The condenser cooling fan motor 12 is operated through the condenser cooling fan motor 12. Also, when the temperature inside the freezer compartment 4 falls below a predetermined temperature, the temperature detector 22
is opened and the selector switch 28 is switched to the normally closed terminal 3o side,
The internal cooling fan motor 15 is also operated through the switching terminal 15B with a low rotation speed. Therefore, unless the load is large, most refrigerators are operated at low speeds, including the internal cooling fan motor 15° and the condenser cooling fan motor 12.
This makes it possible to reduce refrigerator noise.

As is clear from the embodiments described above, the present invention arranges in series a parallel circuit consisting of a compressor, a condenser cooling fan motor, and a refrigerator cooling fan motor, and a temperature controller, and the temperature controller The fan motor for cooling the compressor condenser and the fan motor for cooling the interior of the refrigerator are controlled, and the fan motor for cooling the condenser and the fan motor for cooling the interior of the refrigerator are each provided with a switching terminal that can control the rotation speed. A changeover switch for changing over the changeover terminals is provided for each, and a temperature detector for activating the changeover switch is installed at a place to sense the condensation temperature and a place to sense the temperature inside the refrigerator, and the rotation speed of both fan motors is adjusted according to the load. Since it is controlled, each fan motor rotates according to load fluctuations, etc., which means that it can operate with low noise when the load is low, and can also operate without any problems in terms of performance even under high loads, which has great practical effects. It is.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a refrigerator showing one embodiment of the present invention;
The figure is a front view of the refrigerator, FIG. 3 is a sectional view of the main part, and FIG. 4 is an electrical wiring diagram of the refrigerator. 1... Refrigerator body, 4... Freezer compartment, 5
...Refrigerating room, 8...Cooler, 9...
...Compressor, 12B, 15B...Switching terminal, 12...Condenser cooling fan motor, 15
...Fan motor for internal cooling, 20...
・Temperature controller, 22.26...Temperature detector, 2
7゜28・・・・・・Choice switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2'2'15''lθ/'2.9

Claims (1)

[Claims] A parallel circuit consisting of a compressor, a fan motor for cooling the condenser, and a fan motor for cooling inside the refrigerator is connected in series with a temperature controller. In the device for controlling a cooling fan motor, the condenser cooling fan motor and the refrigerator cooling fan motor are each provided with a switching terminal that can control the rotation speed, and each is provided with a changeover switch for switching the switching terminal. A refrigerator characterized in that temperature detectors that operate changeover switches are provided at a location for sensing condensation temperature and at a location for sensing refrigerator internal temperature.