JPS60129569A - 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.

Conventional structure and its problems Conventionally, as shown in Fig. 1, the compressor a is controlled by a thermostat (not shown) that detects the temperature of the freezing room, passes through the condenser q, and then goes to the refrigerator room thermostat (not shown). ) Controlled by the solenoid valves (s) and (e), the refrigerant is normally
A first refrigeration circuit is formed which supplies the evaporator d for the freezer compartment through the capillary tube h and the evaporator Cf for the refrigerator compartment to cool them simultaneously.On the other hand, when the temperature of the refrigerator compartment falls below the set temperature, the solenoid valve e is activated. is opened, and the solenoid valve (1) is closed to form a second refrigeration circuit that supplies refrigerant only to the second capillary tube (2) and the evaporator (d) in the freezer compartment. When forming this first refrigeration circuit, when the solenoid valve e is closed,
The pressure inside the second capillary tube f is the evaporator d for the freezer compartment.
When the circuit is switched, that is, when the solenoid valve e is opened to form the second refrigeration circuit and the solenoid valve bl is closed, the liquid refrigerant flowing into the second capillary tube f rapidly evaporates. However, gas choke occurs, resulting in the so-called pump-down phenomenon in which the refrigerant in the system collects in the condenser q, resulting in poor cooling. An even bigger problem is that when forming this second refrigeration circuit, the refrigerant that has passed through the second capillary tube F does not entirely flow to the evaporator d for the freezer compartment, but also flows to the evaporator C for the refrigerator compartment, and accumulates there, resulting in a shortage of refrigerant. The phenomenon occurred.

Purpose of the Invention The purpose of the present invention is to prevent the generation of Franche gas that occurs when switching from the first refrigeration circuit to the second refrigeration circuit, and to prevent the generation of Franche gas when switching from the first refrigeration circuit to the second refrigeration circuit, and to The purpose is to prevent refrigerant from accumulating in the evaporator.

Composition of the invention To achieve this objective, the present invention provides a compressor.

A condenser, a first capillary tube, a solenoid valve between the circuit and the evaporator for the freezer compartment, a second capillary tube that communicates with the first capillary tube when the solenoid valve is closed as the first refrigeration circuit, an evaporator for the refrigerator compartment, and a pressure switch. The series circuit of the valve is connected to the second refrigeration circuit, which communicates with the first capillary tube and flows directly to the evaporator for the freezer compartment when the solenoid valve is opened. The pressure on the outlet side is sensed and the valve is closed. During the formation of the second refrigeration circuit, the capillary tube is prevented from being in a low pressure state, the generation of flash gas is prevented, and the problem of non-cooling in the evaporator for the refrigeration compartment is eliminated. This prevents refrigerant from accumulating in the evaporator.

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

In FIG. 2, 1 is a compressor, 2 is a condenser, 3 is a first capillary tube (hereinafter referred to as a capillary tube), 4 is a second capillary tube, and 6 is for cooling the inside of a refrigerator compartment (not shown). 6 is an evaporator for the freezer compartment for cooling the inside of the freezer compartment (not shown), and 10 is a pressure opening/closing valve. Said first capillary 4. Refrigerator evaporator 5. A first refrigeration circuit 7 is constituted by a pressure on-off valve 10. In fact, a second refrigeration circuit 8 is constructed by a joint 12 dedicated to the freezer compartment evaporator which is connected to the freezer compartment evaporator 6 from the outlet nozzle 9b of the solenoid valve 9. The pressure opening/closing valve 1o is provided on the downstream side of the refrigerator compartment evaporator 5, and is operated by a pressure equalizing pipe 11 communicating with the outlet vibe 9b of the solenoid valve 9. This pressure on/off valve 1o
As shown in Fig. 4 and Fig. 6, the inlet vibrator 10a connected to the outlet of the evaporator 5 for the refrigerator compartment and the evaporator 6 for the freezer compartment
It has an exit vibrator 10b connected to the vicinity of sunrise.

10c is the valve seat, 1od is the diaphragm 10ei
lll: connected rods, 1of is a ball valve provided at the tip of rod 10d, and log is a bias spring. Anti-ball valve 10f of diaphragm 10e of this valve 1o
One end of the pressure equalization pipe 11 is connected to the side pressure equalization chamber 1Oh,
The other end is connected to the outlet vibe 9b of the solenoid valve 9 as described above. When the first refrigeration circuit 7 is formed, the solenoid valve 9 is closed, and the refrigerant is supplied to the compressor 1. Condenser 2. First capillary 3° Second capillary 4. It circulates with the refrigerator compartment evaporator 6 and reaches the pressure on/off valve 10. At this time, the pressure in the pressure equalization chamber 1oh is lowered by the pressure equalization pipe 11, and as a result, the ball valve 1of is separated from the valve seat 1oC and becomes an open state, and the first refrigeration circuit 7, that is, the evaporator 5 for the refrigerator compartment It goes to evaporator 6 for the freezer compartment. Further, when the second refrigeration circuit 8 is formed, the solenoid valve 9 is opened, and the refrigerant circulates from the first capillary tube 3 to the joint pipe 12 dedicated to the freezer compartment evaporator.

At this time, the pressure in the pressure equalization pipe 11 increases, so the pressure in the pressure equalization chamber 10h increases.
The pressure inside increases, and as a result, the ball valve 10f is brought into close contact with the valve seat 10C and becomes a closed circuit state, and the second refrigeration circuit 8, that is, the compressor 1. Condenser 2゜First capillary tube 3
．． Freezer compartment evaporator joint pipe 12. A refrigeration circuit going to the evaporator 6 for the freezer compartment is configured. Therefore, normally the solenoid valve 9 is closed,
When the pressure on/off valve 10 is opened, it constitutes the first refrigeration circuit 7, and when the solenoid valve 9 is opened and the pressure on/off valve 10 is closed, the circuit is switched to the second refrigeration circuit 8.

Next, the electric circuit shown in FIG. 3 will be explained.

Reference numeral 13 denotes a refrigerating room thermostat that operates by sensing the temperature inside the refrigerating room, and includes a movable contact 13a and a fixed contact 13b that opens when the temperature inside the room falls below a set value. This refrigerator room thermostat 1
The movable contact 13 a of No. 3 is connected to one end of the AC power source 15 . Fixed contact 13 of the above-mentioned refrigerator room thermostat 13
b is connected to the other end of the power source 16 via the excitation coil 16 of the first electromagnetic valve 9 that selects the first and second refrigeration circuits 7 and 8. The power supply 16 has a compressor drive motor 1γ.
A thermostat 14 for the freezer compartment that detects the temperature of the freezer compartment.
connected in series with. 14a is a movable contact, and 14b is a fixed contact.

The operation in such a configuration will be explained. First, during installation,
Or evaporator for refrigerator room6. The freezer compartment evaporator 6 is kept in a state where it is not cold at all. In this state, the temperature in the freezer compartment and the temperature in the refrigerator compartment are above the set values, so the movable contact 14a of the freezer compartment thermostat 14 is closed to the fixed contact 12b. Therefore, the compressor drive motor 17 is driven and the compressor 1 starts operating. ” Immediately after the compressor starts operating, the temperature in the refrigerator compartment is below the set value, so the movable contact 13a of the refrigerator compartment thermostat 13 separates from the fixed contact 13b, and the excitation coil 16 of the solenoid valve 9 is not energized, and the first A cooling operation is carried out in the refrigeration circuit element, and the refrigerator compartment and the freezer compartment are respectively cooled.When the temperature inside the refrigerator compartment falls below the set value, the movable contact 13a of the refrigerator compartment thermostand 13 changes to the fixed contact 13b. It is closed, the excitation coil 16 of the solenoid valve 9 is energized, the second refrigeration circuit 8 performs a cooling operation, and only the freezing compartment is cooled.

The compressor 1 is turned on and off by a freezer thermostat 14.

Therefore, when performing cooling operation in the first refrigeration circuit 7,
The pressure inside the second refrigeration circuit 8 drops to the pressure inside the evaporator θ for the freezer compartment, but since there is no capillary tube in the second refrigeration circuit 8, when the solenoid valve 9 is opened, the second refrigeration circuit 8
The liquid refrigerant inside flows to the freezer compartment evaporator 6 without being evaporated. In addition, the pressure gap closing valve 10 eliminates refrigerant diversion to the refrigerator compartment evaporator 5 when forming the second refrigeration circuit 8, thereby preventing refrigerant accumulation, that is, a lack of refrigerant circulation.

Effects of the Invention The present invention provides a pressure opening/closing valve that closes when the second refrigeration circuit is formed on the downstream side of the evaporator for the refrigerator compartment in the first refrigeration circuit. No refrigerant accumulation occurs. Since there is no capillary tube in the second refrigeration circuit when operating in the first refrigeration circuit, the pump-down phenomenon that occurs instantaneously when switching from the first refrigeration circuit to the second refrigeration circuit is eliminated and normal circulation is performed. be able to. or,
Only one solenoid valve is required, which greatly contributes to power savings.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration system diagram of a conventional refrigeration equipment, Fig. 2 is a refrigeration system diagram of a refrigeration equipment according to an embodiment of the present invention, Fig. 3 is an electric circuit diagram of the refrigeration equipment, and Fig. 4 is the same pressure opening/closing diagram. A cross-sectional view of the valve, and FIG. 6 is a diagram showing the structure of the solenoid valve and connections of each piping. 1... Compressor, 2... Condenser, 3...
...First capillary, 4...Second capillary, 6
・Mountain: Refrigerator evaporator, 6: Freezer evaporator, 7: 1st refrigeration circuit, 8: 2nd
Refrigeration circuit, 9. River: Solenoid valve, 1o. River: Pressure opening/closing valve, 12... Joint pipe dedicated to evaporator for freezing room, 13..
... Thermostat for refrigerator room, 14 ... Thermostat for freezer room. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 20 Figure 4 Figure 5

Claims (1)

[Claims] A compressor controlled by a freezer compartment thermostat. A condenser, a first capillary tube, a second capillary tube that is connected between a solenoid valve controlled by a refrigerator thermostat and a freezer compartment evaporator and communicates with the first capillary tube when the solenoid valve is closed, and a freezer compartment evaporator; A first refrigeration circuit equipped with a pressure opening/closing valve that senses the pressure on the outlet side when the solenoid valve is opened and closes it, and a joint pipe dedicated to the freezer compartment evaporator that communicates with the first capillary when the solenoid valve is opened. A refrigeration device connected to a second refrigeration circuit.