JPS5986868A - 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 Field of the Invention The present invention relates to a refrigeration system used in a two-temperature refrigerator or the like.

Conventionally, as shown in Fig. 1, the compressor is controlled by a thermostat that detects the temperature of the freezer compartment.
and an on-off valve g controlled by the refrigerator thermostat.
, h, when the temperature of the refrigerator compartment reaches the set temperature or higher, the on-off valve q is opened, the on-off valve is closed, and the refrigerant is transferred to the evaporator 1 for the refrigerator compartment.
The refrigerant is supplied to the evaporator j for the freezer compartment to cool them simultaneously, and when the temperature of the refrigerator compartment falls below the set temperature, the on-off valve 8 is closed, and the on-off valve is opened to supply the refrigerant only to the evaporator 1 for the freezer compartment. It is supplied to and cooled. In this way, the two refrigeration circuits are switched using the on-off valves q and h, but since the amount of refrigerant sealed in the circuit is fixed, when switching to the circuit that supplies refrigerant only to the evaporator j for the freezer compartment, Since the refrigeration load is only in the freezer compartment, the load becomes small, and the condensation temperature ' becomes low, so that the condensation prevention heating pipe d loses its immediate purpose of preventing condensation, and the refrigerant cannot be completely evaporated in the evaporator j for the freezer compartment, and the compressor Object of the Invention The object of the present invention is to prevent the 70° stback phenomenon when switching to a refrigeration circuit with only an evaporator for the freezer compartment, and to raise the condensation temperature at which condensation can be prevented. The purpose is to ensure that

DESCRIPTION OF THE INVENTION To achieve this object, the inlet of the third capillary of the circuit that allows refrigerant to flow only to the freezer compartment evaporator is connected between the inlet and outlet vibes of the main condenser, and By storing refrigerant in the downstream main condenser, the 70° stroke phenomenon can be prevented, and the functional heat dissipation area of the main condenser can be reduced to ensure an optimal condensation temperature and prevent dew condensation.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 3, 1 is a compressor, 2 is a defrost water evaporation pipe,
3 is the anti-condensation heating pipe of the refrigerator body, 4 is the main condenser,
5 is a first capillary, 6 is a refrigerator compartment evaporator for cooling the interior of the refrigerator compartment, 7 is a second capillary, 8 is a freezer compartment evaporator for cooling the interior of the freezer compartment, and main condenser 4 A first on-off valve 9 is connected between the first capillary tube 5 and the first capillary tube 5 to form a first refrigeration circuit 1o. 11 is the third capillary;
One end of the capillary tube 11 is connected to a branch part 4c between the inlet vibe 4a and the outlet vibe 4b of the main condenser 4,
The other end is provided between the second capillary tube 7 and the freezer compartment evaporator 8 via the second on-off valve 12 .

That is, the compressor 1, the defrosting water evaporation pipe 2, the anti-condensation heating pipe 3, and the main condenser 4 are branched out to form a third capillary tube 11, a second on-off valve 12, a freezer compartment evaporator 8, and a suction line. 13 constitutes a second refrigeration circuit 14. The first refrigeration circuit 10 and the second refrigeration circuit 14 are configured to be selectively switched by the first on-off valve 9 and the second on-off valve 12. When the temperature of the refrigerator compartment is above the set value, the first on-off valve 9 is opened and the second on-off valve 12 is closed to form the first refrigeration circuit 1o, and when the temperature of the refrigerator compartment is below the set value, the first on-off valve 9 is opened and the second on-off valve 12 is closed. The on-off valve e is closed and the second on-off valve 12 is opened to form the second refrigeration circuit 14.

Next, the electric circuit shown in FIG. 2 will be explained. Reference numeral 015 is a refrigerator room thermostat that is activated by sensing the temperature inside the refrigerator room, and the movable contact 15a1 is activated when the temperature inside the room exceeds a set value. The movable contact 15a is provided with a second fixed contact 15c which is closed when the temperature inside the room becomes below a set value.

A movable contact 15a of this refrigerator room thermostat 15 is connected to one end of an AC power source 16. The first fixed contact 16b of the refrigerator room thermostat 15 is connected to the other end of the power source 16 via the excitation coil 9a of the first on-off valve 9 constituting the first refrigeration circuit 1o. The second fixed contact 15c of the room thermostat 15 is connected to the other end of the power source 16 via the excitation coil 12a of the second on-off valve 12 constituting the second refrigeration circuit 14. A compressor drive motor 1a is connected in series with a freezer compartment thermostat 17 that detects the temperature of the freezer compartment, with 17a being a movable contact and 17b being a fixed contact.

The operation in such a configuration will be explained. First, during installation,
Alternatively, the evaporator β for the refrigerator compartment and the evaporator 8 for the freezer compartment are not cooled at all. In this state, the temperature in the freezer compartment and the temperature in the refrigerator compartment are higher than the set values, so the movable contact 17a of the freezer compartment thermostat 17 is closed to the fixed contact 17b. Therefore, the compressor drive motor 1a is driven and the compressor 1 starts operating.

And the movable contact 15aIJ of the refrigerator thermostat 15
Since the ilE1 fixed contact 15b is closed, the excitation coil 9a of the first on-off valve 9 is energized, the first refrigeration circuit 10 performs cooling operation, and the refrigerator compartment is heated to the evaporation temperature reduced by the first capillary tube 5. The freezer compartments are each cooled at the evaporation temperature, which is further reduced in pressure by the second capillary tube 7.

Therefore, when the temperature inside the refrigerator compartment becomes lower than the set value, the movable contact 15a of the refrigerator compartment thermostat 15 changes to the first contact 15.
b, closes the second fixed contact 15c, energizes the excitation coil 12a of the second on-off valve 12, performs cooling operation in the second refrigeration circuit 14, and freezes at the evaporation temperature reduced in the third capillary tube 11. Only the room is cooled.

The compressor 1 is turned on and off by a freezer thermostat 17.

Therefore, when switching from the first refrigeration circuit 10 to the second refrigeration circuit 14, the inlet vibrator 4a and outlet vibrator 4b of the main condenser 4
Flows into the third capillary tube 11 from the branch 4C between the
The refrigerant liquid can be stored in the volume of the refrigerant circuit between the branch part 4C and the closed first on-off valve 9, thereby preventing the phenomenon of 70% backflow from the freezer compartment evaporator 8 to the suction line 13. and - branch 4 of the main condenser 4.
Downstream from c, the heat radiation effect is lost and the condensation temperature does not become too low, ensuring an optimum condensation temperature, and the heat radiation of the anti-condensation heating pipe 3 can prevent condensation on the cabinet flange and cross rail of the refrigerator.

Effects of the Invention The present invention connects the inlet of the third capillary of the second refrigeration circuit to the branch between the inlet and outlet of the main condenser, so that during cooling operation in the second refrigeration circuit, By storing liquid refrigerant downstream from the branch part of the main condenser, the frosted pack phenomenon can be eliminated.
Further, the condensation temperature can be prevented from becoming too low, ensuring an optimum temperature for preventing dew condensation.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration circuit diagram showing a conventional example, Fig. 2 is an electric circuit diagram of an embodiment of the present invention, and Fig. 3 is a refrigeration circuit diagram of an embodiment of the present invention. ... Compressor, 3 ... Condensation prevention heating pipe, 4 ... Main condenser, 5 ... First capillary tube, 6 ... Evaporation for refrigerator compartment vessel (first evaporator),
7...Second capillary tube, 8...Evaporator for freezer compartment (second evaporator), 9...First on-off valve, 10
......First refrigeration circuit, 11...Third capillary, 12...Second on-off valve, 14...Second refrigeration circuit, 15... ... Thermostat for the refrigerator compartment (first thermostat), 17... Thermostat for the freezer compartment (second thermostat). Qin l Ward/7tL Figure 3

Claims (1)

[Claims] A compressor controlled by a freezer thermostat, a condensation prevention heating pipe, a main condenser, a first on-off valve controlled by a first thermostat, a first capillary, a first evaporator, a second capillary, and a first capillary. a first refrigeration circuit having two evaporators; a second refrigeration circuit having a third capillary tube and a second on-off valve located downstream of the third capillary tube and controlled by a second thermostat; A refrigeration system in which one end of a refrigeration circuit is connected between an inlet vibrator and an outlet vibrator of the main condenser, and the other end on the second on-off valve side is connected between the second capillary tube and the second evaporator.