JPS6050251B2 - Refrigeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration system, and in particular has two or more chambers with different temperatures, such as a freezing chamber and a refrigerator chamber, and each of these chambers is cooled independently. The present invention relates to a refrigeration device.

Generally, in refrigerators that have a freezer compartment and a refrigerator compartment that need to be cooled to different temperatures as described above, each compartment is cooled separately, so each compartment is equipped with a dedicated freezer compartment evaporator or refrigerator. is equipped with an evaporator for the refrigerator compartment, and controls the flow of refrigerant to both of the evaporators or only one of them by opening and closing a solenoid valve installed in the piping connecting them. There is.

However, such devices require valve devices with mechanically movable parts, such as solenoid valves, and since these valve devices are buried in the insulation wall, maintenance and inspection are difficult once they are assembled. However, there are problems in that the lifespan and reliability of the refrigerator are not necessarily sufficient, and the structure is expensive.

Therefore, recently, a refrigeration system has been proposed that uses a bubble pump that has no mechanically movable parts, has a simple structure, and functions as a switching valve for the flow of refrigerant.

The present invention provides a refrigeration system in which refrigerant switching is performed using the bubble pump described above, in which the switching is performed reliably, the configuration is simple, and the efficiency of the refrigeration cycle can be improved. The purpose is to provide

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a compressor, and high-temperature refrigerant gas compressed by the compressor 1 is condensed in a condenser 2 and supplied to a liquid tank 5 via a capillary tube 3 and a refrigerant supply conduit 4.

That is, in the liquid tank 5, an auxiliary tank 6 is provided that projects upward from the bottom of the liquid tank 5, and one end of the S1-shaped conduit 7 is connected to the bottom of the auxiliary tank 6. The other end of the U-shaped conduit 7 is a liquid tank 5
It has an opening at the bottom. Incidentally, the liquid tank 5 is provided with a conduit 8 that penetrates through its top wall and extends into the tank 5, and the other end of the conduit 8 is connected to a refrigerator compartment evaporator 10 via a capillary tube 9. is,
Further, a freezer compartment evaporator 12 is connected to the refrigerator compartment evaporator 10 via a connecting pipe 11.
2 is connected to the suction side of the compressor 1 to form one closed cycle.

On the other hand, the refrigerant supply conduit 4 is inserted into the top opening of the auxiliary tank 6, and another conduit 13 is inserted into the top opening of the auxiliary tank 6.
is connected via a capillary tube 14 to the middle of a connecting pipe 11 that connects the evaporator 10 for the refrigerator compartment and the evaporator 12 for the freezer compartment.

In this case, the tip of the conduit 13 is positioned above the tip opening of the other conduit 8. The U-shaped conduit 7 also includes a bubble pump heater 15 at the bottom of the riser pipe section 7a connected to the bottom of the auxiliary tank 6.
is wrapped.

FIG. 3 is an electrical control circuit diagram of the above device, in which the compressor 1 is driven when the defrosting switch 20 is in contact with the contact a side and the freezer compartment control switch 21 is in the ON state.
For example, when the temperature of the refrigerator compartment falls below a predetermined temperature and the refrigerator compartment control switch 22 becomes ON, the bubble pump heater 15, connecting pipe heater 23, and gutter heater 24 are energized to cool the freezer compartment to a predetermined temperature and control the freezer compartment. When the switch 21 is turned OFF, the drive of the compressor 1 is stopped. Furthermore, when the defrost switch 20 is switched to the contact b side, the defrost heater 25 and the defrost heat-sensitive tube heater 26 are energized as in the conventional refrigerator. In the drawing, reference numeral 27 is a defrost detection bimetal, 28 is a door switch, 29 is an interior light, 30 is a drain heater, 31 is a freezer compartment control switch, and 32 is a fuse. Therefore, if both the refrigerator compartment and the freezer compartment do not reach their respective predetermined temperatures, but the temperatures exceed the predetermined temperatures, the freezer compartment control switch 21 is set to 0.
N, and the refrigerator compartment control switch 22 is in the OFF state.

Therefore, the compressor is driven with the bubble pump heater 15 in the OFF state. When the compressor is driven in this manner, the refrigerant compressed by the compressor and then condensed by the condenser 2 flows into the auxiliary tank 6 and further passes through the U-shaped conduit 7. It also flows into the liquid tank 5. When the liquid refrigerant accumulates in both tanks 5 and 6 and the liquid level rises to a position slightly above the lower end opening of the conduit 8, the pressure applied on the liquid level in the liquid tank 5 and the evaporator for the refrigerator compartment Due to the negative pressure on the 10 side, the liquid refrigerant flows into the conduit 8.
It flows through the capillary tube 9 into the evaporator 10 for the refrigerator compartment, and then passes through the evaporator 12 for the freezer compartment in order to cool the refrigerator compartment and the freezer compartment, respectively, by both evaporators 10 and 12. (Figure 1). In this state, since the top end of the auxiliary tank 6 is open into the liquid tank 5, the liquid level in the auxiliary tank 6 is maintained at the same level as the liquid level in the liquid tank 5, and moreover, the evaporation for the freezer compartment is Since the tip opening of the conduit 13 connected to the refrigerator side is located above the conduit 8 connected to the other refrigerator compartment evaporator 10 side, the liquid refrigerant flows to the conduit 13 side directly to the freezer compartment evaporator 10 side. It does not flow into the evaporator 12.

When the refrigerator compartment is cooled to a predetermined temperature, the refrigerator compartment control switch 22 is switched to the ON side, and the bubble pump heater 15 is energized.

Therefore, the riser pipe portion 7a of the U-shaped conduit 7 is heated by the bubble pump heater 15, whereby the liquid refrigerant inside the riser pipe portion 7a is boiled and bubbles made of refrigerant vapor are generated. The liquid refrigerant is pushed up by the pumping action of the bubbles (Fig. 2), and the auxiliary tank 6
The liquid level inside rises. When the liquid level reaches slightly above the opening at the tip of the conduit 13, the liquid refrigerant in the auxiliary tank 6 flows into the conduit 13, passes through the capillary tube 14, and directly flows into the freezer compartment evaporator 12. , the cooling action of the freezer compartment is performed. In this case, the liquid refrigerant in the liquid tank 5 is moved to the auxiliary tank 6 side by the bubble pump action, and the refrigerant that is supplied to the auxiliary tank 6 and is about to move to the liquid tank 5 side is caused to flow back, so that the liquid refrigerant is The liquid level in the tank 5 decreases, and the opening end of the conduit 8 opens into the gas phase in the liquid tank 5, so the flow of liquid refrigerant to the refrigerator compartment evaporator 10 is completely stopped, and the refrigerator compartment Cooling is interrupted. Thereafter, the drive of the compressor 1 is repeatedly stopped depending on the rise and fall of the temperature of the freezer compartment, and if the temperature of the refrigerator compartment exceeds a predetermined value during that time, the refrigerator compartment control switch 22 is set to 0F.
F, the operation of the bubble pump is stopped, and as described above, the liquid refrigerant flows through the conduit 8 and the evaporators 10 and 12 in sequence, thereby cooling the refrigerator compartment and the freezing compartment.

In addition, in the above embodiment, when the bubble pump is activated, the liquid refrigerant is flowed only to the evaporator for the freezer compartment, but when the bubble pump is activated, both the evaporators for the refrigerator compartment and the freezer compartment are flowed. Alternatively, the liquid refrigerant may flow into the refrigerant.

Further, although the above embodiments have been described with respect to a refrigerator, the present invention can also be applied to other refrigeration devices. As explained above, in the present invention, an auxiliary tank is built into the liquid tank, and liquid refrigerant from the compressor is supplied to this auxiliary tank, and a conduit through which the refrigerant flows when the bubble pump is activated is connected to this auxiliary tank. A conduit through which the refrigerant flows when the bubble pump is not in operation is opened in the outer liquid tank, and the open end is positioned below the open end of the conduit through which the refrigerant is drawn out when the bubble pump is in operation. In the case of the above embodiment, when only the evaporator for the freezer compartment is in operation, even if refrigerant is suddenly supplied immediately after the compressor turns 0N, the liquid level in the auxiliary tank will only rise rapidly, and the liquid level in the outer liquid tank will rise. There is almost no possibility that refrigerant will inadvertently flow into the evaporator for the refrigerator compartment when it is not in operation.

Therefore, the inlet portion of the refrigerator compartment evaporator is not overcooled and ice does not form there, and the efficiency of the refrigeration cycle can be improved.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of the refrigeration cycle of the refrigeration system of the present invention, respectively. FIG. 1 is an explanatory diagram showing when the bubble pump is not operating, FIG. 2 is an explanatory diagram showing when the bubble pump is operating, and FIG. There is an electrical control circuit diagram. 1... Compressor, 4... Refrigerant supply conduit,
5... Liquid tank, 6... Auxiliary tank, 7... U-shaped conduit, 8, 13... Conduit, 10... Refrigeration Room evaporator, 12...
Evaporator for freezer compartment, 15...Bubble pump heater.

Claims (1)

[Claims] 1 A plurality of evaporators, a liquid tank that stores liquid refrigerant discharged from the compressor and condensed by a condenser, and a liquid refrigerant connected to the liquid tank and configured to control the liquid refrigerant in the liquid tank to a predetermined level when the heater is activated. a bubble pump for supplying liquid refrigerant in the liquid tank to the evaporator side; one end opens at the top of the liquid tank and the other end is connected to the other evaporator; In a refrigeration system provided with a conduit for feeding to the evaporator side, an auxiliary tank is built in the liquid tank, and the bottoms of both tanks are connected through a substantially U-shaped conduit, and the U-shaped A bubble pump heater is wrapped around the lower part of the riser pipe connected to the auxiliary tank of the conduit, and a refrigerant supply conduit connected to the condenser and a conduit from which refrigerant is drawn out when the bubble pump is activated are connected to the auxiliary tank from above. A conduit through which the refrigerant is drawn out when the bubble pump is not in operation is opened into the liquid tank, and its open end is positioned below the open end of the conduit through which the refrigerant is drawn out when the bubble pump is in operation. A refrigeration device featuring: