JPS6050256B2 - 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 is a refrigeration system in which the refrigerant is switched 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 equipment.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 1, reference numeral 1 is a compressor, and the high-temperature gas of the refrigerant compressed by the compressor 1 is transferred to a condenser 2.
The capillary tube 3 and the refrigerant supply conduit 4
The liquid is supplied to the liquid tank 5 through the.

The tip of the refrigerant supply conduit 4 penetrates the top wall of the liquid tank 5 and opens at a predetermined height position within the liquid tank 5,
Further, the liquid tank 5 is equipped with a conduit 6 that extends into the liquid tank 5 through its top wall and opens at a position above the opening position of the refrigerant supply conduit 4. The other end of the conduit 6 is connected to a refrigerator compartment evaporator 8 via a capillary tube 7, and a freezer compartment evaporator 10 is further connected to the refrigerator compartment evaporator 8 via a connecting pipe 9. This freezer compartment evaporator 10 is connected to the suction side of the compressor 1 to form one closed cycle. On the other hand, one end of a U-shaped conduit 11 is opened at the bottom of the liquid tank 5, and the other end riser pipe portion 11a of the U-shaped conduit 11 is located above the top of the liquid tank 5. There, it is bent into an inverted U-shape, and the tip of the bent portion 11b also penetrates the top wall of the liquid tank 5 and extends into the interior thereof.

Further, a conduit 12 is provided in the liquid tank 5 so as to protrude through the bottom wall thereof and extend to a portion near the top wall of the liquid tank 5, and the riser pipe portion 11a is provided in the top opening of the conduit 12.
As clearly shown in FIGS. 2 and 3, the tips of the bent portions 11b formed at the upper portions of the two are inserted so that an annular gap 13 is formed between them.

The lower end of the conduit 12 is connected to a capillary tube 14.
The connecting pipe 9 connects the refrigerator compartment evaporator 8 and the freezer compartment evaporator 10 via the connecting pipe 9. connected inside. By the way,
A bubble pump heater 15 is wound around the lower outer periphery of the riser pipe portion 11a of the U-shaped conduit 11, and the operation of the bubble pump heater 15 generates refrigerant bubbles within the riser pipe portion 11a. ! It is made to live.

In addition, as shown in FIG. 4, the bubble generating part around which the bubble pump heater 15 is wound has a porous material such as sintered metal or mesh through which the refrigerant can flow, or fine irregularities. It is filled with substance 16. In addition, the above 4
In order to improve the circulation of the refrigerant, the porous material or the material 16 having fine irregularities is formed so that a vertical through gap 17 is created between it and the inner surface of the riser pipe 11a, as shown in FIG. Alternatively, as shown in FIG. 6, an upper and lower through hole 18 may be provided in the center thereof. FIG. 7 is an electrical control circuit diagram of the above device, in which the compressor 1 is driven when the defrost switch 20 is in contact with the contact a side and the freezer compartment control switch 21 is in the ON state, When the temperature 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 the freezer compartment control switch 21 is turned on. is 0
When it becomes FF, driving 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. Ru. In the figure, reference numeral 27 is a defrost detection bimetal, 28 is a door switch, 29 is an interior light, and 3
0 is a drain heater, 31 is a heater for the freezer compartment control switch, and 32 is a fuse. In addition, FIG. 8 shows an evaporator "8" for the refrigerator compartment, an evaporator "10" for the freezer compartment,
It is a diagram showing a schematic arrangement of a bubble pump switching device section, etc., and the bubble pump switching device sections 5, 6, 11a, and 15 are arranged on the rear wall of the freezing chamber.

Therefore, if both the refrigerator compartment and the freezer compartment do not reach their respective predetermined temperatures but exceed the predetermined temperatures, the freezer compartment control switch 21 is set to ON, and the refrigerator compartment control switch 22 is set to 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 that is compressed by the compressor and then condensed by the condenser 2 flows into the liquid tank 5. When the liquid refrigerant accumulates in the liquid tank 5 and its liquid level rises to a position slightly above the lower end opening of the conduit 6, the pressure applied on the liquid level in the liquid tank 5 and the pressure on the refrigerator compartment evaporator 8 side increase. Due to the negative pressure, the liquid refrigerant rises in the conduit 6, passes through the capillary tube 7, flows into the refrigerator compartment evaporator 8, and then sequentially flows through the freezer compartment evaporator 10 to reach both evaporators 8. , 10 respectively cool the refrigerator compartment and the freezer compartment (FIG. 2). In this state, the liquid refrigerant also flows into the U-shaped conduit 11 connected to the bottom of the liquid tank 5; is partially inserted into the conduit 12 so as to form an annular gap 13 between it and the conduit 12, so that the riser pipe portion 11a and the upper part of the liquid tank 5 communicate with each other through the annular gap 13 to equalize the pressure. The liquid refrigerant level in the riser pipe portion 11a is maintained at the same level as the liquid level in the liquid tank 5, and the liquid refrigerant does not flow into the conduit 12 side via the bent portion 11b.

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 bubble generating section of the riser pipe section 11a is heated by the bubble pump heater 15, whereby the liquid refrigerant inside the bubble generating section is boiled and bubbles made of refrigerant vapor are generated. Due to the pumping action of , the cooling action of the freezer compartment is performed. In this case, since the bubble generating part of the riser pipe part 11a to which the bubble pump heater 15 is attached is filled with a porous material 16 such as sintered metal, the heat conduction area to the refrigerant is wide. Become,
In addition, the unevenness promotes the bubble generation effect, causing bubble generation to occur rapidly, and based on this, the pumping action of the liquid refrigerant is promoted. Therefore, the supply of refrigerant to the freezer compartment evaporator is rapidly started. On the other hand, at this time, the liquid refrigerant in the liquid tank 5 is fed to the conduit 12 side by the bubble pump action as described above, so the liquid level in the liquid tank 5 decreases and the lower end opening of the conduit 6 is filled with liquid. Since the refrigerant supply conduit 4 is open to the gas phase in the tank 5 and the lower end opening of the refrigerant supply conduit 4 is located below the opening position of the conduit 6, the liquid refrigerant spouted from the refrigerant supply conduit directly flows into the conduit 6. Therefore, the flow of liquid refrigerant to the refrigerator compartment evaporator 8 is completely stopped.
Cooling of the refrigerator compartment is interrupted.

Thereafter, the drive of the compressor 1 is repeatedly stopped depending on the rise and fall of the temperature in the freezer compartment, and when the temperature in the refrigerator compartment reaches a predetermined level or higher during that period, the refrigerator compartment control switch 22 is switched to 0FF, and the operation of the bubble pump is stopped. However, as described above, the liquid refrigerant sequentially flows through the evaporators 8 and 10 through the conduit 6, thereby cooling the refrigerator compartment and the freezing compartment.

As explained above, in the present invention, since the bubble generating part is filled with a porous substance or a substance having fine irregularities, the heat transfer area from the bubble pump heater to the refrigerant is increased.
The generation of bubbles is promoted by the bubble nucleus generation effect of the uneven parts, which improves pump efficiency, significantly reduces the time required for bubble generation, and makes it easier to feed refrigerant to the freezer compartment side evaporator. This is done rapidly, and has the effect of rapidly cooling the freezer 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.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the refrigeration cycle of the refrigeration system of the present invention, Figs. 2 and 3 are enlarged views of the air and foam pump parts, Fig. 2 shows the air bubble pump when it is not in operation, and Fig. 3 shows the An explanatory diagram showing when the bubble pump is in operation, FIG. 4 is an enlarged sectional view of the bubble generating part,
5a and 6a are perspective views showing other embodiments of the filling material, and FIGS. 5b and 6b are sectional views showing the filling material installed in the riser pipe, respectively, Fig. 7 is a schematic diagram showing the arrangement of the electric control circuit, and Fig. 8 is a schematic diagram showing the arrangement of the bubble pump section, etc. 1... Compressor, 2... Capacitor, 5
...Liquid tank, 8...Evaporator for refrigerator compartment, 10...Evaporator for freezer compartment, 11...
・U-shaped conduit, 11a... riser pipe section, 15・
... Bubble pump heater, 16 ... Porous material or material having fine irregularities.

Claims (1)

[Scope of Claims] 1. A refrigeration system having a plurality of evaporators, in which supply of refrigerant discharged from a compressor to each evaporator is controlled by on/off control of a bubble pump, A riser pipe is connected to the lower part of the liquid tank to which the refrigerant discharged from the compressor is supplied, and generates bubbles of refrigerant gas inside by heating with a bubble pump heater, and transfers the refrigerant using the bubbles. In addition, a refrigeration device characterized in that a bubble generating portion of the riser pipe around which the bubble pump heater is wrapped is filled with a porous substance or a substance having fine irregularities through which a refrigerant can flow. 2. The refrigeration system according to claim 1, wherein the material filled into the riser pipe is formed with a refrigerant flow passage that passes through the riser pipe vertically.