JPS6050254B2 - 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 a valve device with mechanically movable parts such as a solenoid valve, and since these valve devices are buried in a heat insulating wall, maintenance and inspection are required once they are assembled. However, there are problems such as the lifespan and reliability of the refrigerator are not necessarily sufficient, and there are other disadvantages such as the structure being 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 characterized in that the refrigerant is switched by the above-mentioned bubble pump, in which the switching is performed reliably, the assembly is easy, the configuration of the switching device section can be made compact, and the refrigerating cycle It is an object of the present invention to provide a refrigeration system that can also improve the efficiency of refrigeration.

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.
It is condensed in the liquid tank 4 via the main capillary tube 3.
supplied to

The liquid tank 4 is fitted with a capillary tube 5 that extends into the liquid tank 4 through its top wall and opens at a position above the opening position of the refrigerant supply conduit 4.

The capillary tube 5 is connected to an evaporator 6 for the refrigerator compartment, and an evaporator 8 for the freezer compartment is further connected to the evaporator 6 for the refrigerator compartment via a connecting pipe 7. is connected to the suction side of the compressor 1, forming one closed cycle. On the other hand, one end of a U-shaped conduit 9 is opened at the bottom of the liquid tank 4, and the riser pipe portion 9a at the other end of the U-shaped conduit 9 extends from the top of the liquid tank 4. It extends upward, where it is bent into an inverted U-shape, and the tip of the bent portion 9a also penetrates the top wall of the liquid tank 4 and extends into its interior.

Furthermore, a conduit 10 is provided in the liquid tank 4 so as to protrude through the bottom wall of the liquid tank 4 and extend to a portion near the top wall of the liquid tank 4. The tips of the formed bent portions 9b are connected to each other with an annular gap 1.
It is inserted so that 1 is formed.

The lower end of the conduit 10 is connected to a capillary tube 12.
It is connected to the middle of a connecting pipe 7 that connects the refrigerator compartment evaporator 6 and the freezer compartment evaporator 8 through the evaporator 6 . By the way, a bubble pump heater 13 is wound around the outer periphery of the lower part of the rising pipe part 9a of the U-shaped conduit 9, and a mounting part of the bubble pump heater 13 is wound on the inner surface of the rising pipe part 9a. Concave and convex portions 14 are formed only in the lower half.

Incidentally, a connecting vibrator 15 is inserted into the liquid tank 4 through its top wall so that its lower end surface is located below the top end of the conduit 10. The tips of the main capillary tube 3 connected to the capacitor 2 side and the capillary tube 5 connected to the refrigerator compartment evaporator 6 side are inserted and fixed, respectively.

In this case, the opening at the tip of the main capillary tube 3 is made to protrude downward from the lower end of the connecting vibrator 15, while the other capillary tube 5 is opened into the connecting vibrator 15. It is sealed at its top end. 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 in the refrigerator compartment. When the temperature drops below a predetermined temperature and the refrigerator compartment control switch 22 turns ON, the bubble pump heater 13, connecting pipe heater 23, and gutter heater 24 are energized, the freezer is cooled to a predetermined temperature, and the freezer compartment control switch 21 is turned on. When it becomes 0FF, 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 similarly to a conventional refrigerator. In the figure, reference numeral 27 is a defrost detection bimetal, 28 is a door switch, 29 is an interior light, and 30
is the drain heater, 30 is the freezer compartment control switch,
32 is a fuse. 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 13 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 4. When the liquid refrigerant accumulates in the liquid tank 4 and the liquid level rises to a position slightly above the lower end opening of the connecting pipe 15, the pressure applied on the liquid level in the liquid tank 4 and the side of the refrigerator compartment evaporator 6 The liquid refrigerant rises in the capillary tube 5 due to the negative pressure of
, 8 cool the refrigerator compartment and the freezer compartment, respectively (FIG. 1). In this state, the liquid tank 4
The liquid refrigerant also flows into the U-shaped conduit 9 connected to the bottom of the riser, but the tip of the inverted U-shaped bent part 9b formed at the top of the riser pipe 9a is connected to the conduit 10 in an annular shape. Since it is partially inserted into the conduit 10 so as to form a gap 11,
The riser pipe part 9a and the upper part of the liquid tank 4 are connected to each other to equalize the pressure, and the liquid level of the liquid refrigerant in the riser pipe part 9a is maintained at the same level as the liquid level in the liquid tank 4, so that the liquid refrigerant is Bent part 9
It does not flow into the conduit 10 side via b.

Here, 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 13 is energized.

Therefore, the riser pipe portion 9a is heated by the bubble pump heater 13, whereby the liquid refrigerant inside the riser pipe portion 9a is boiled and bubbles made of refrigerant vapor are generated, and the pump action is caused by the bubbles. The liquid refrigerant is pushed up (Fig. 2) and flows from the top of the riser pipe section 9a to the conduit 10.
The liquid refrigerant flows into the capillary tube 1.
2 and flows into the freezer compartment evaporator 10, where the cooling effect of the freezer compartment is performed. In addition, only in the lower half of the range where the bubble pump heater 13 is attached to the riser pipe part 9a.
Since unevenness 14 is formed on the inner surface, the unevenness 1
The fourth part generates bubbles relatively quickly and vigorously, thereby promoting the pumping action of the liquid refrigerant. Moreover, since the inner surface of the tube is smooth in the upper half of the attachment part of the bubble pump heater 13, bubbles are generated smoothly in that part, and the resistance of the tube is small, so that the bubbles generated in the lower half are smooth. The bubbles rise unhindered,
This greatly improves pump efficiency. On the other hand, at this time, the liquid refrigerant in the liquid tank 4 is fed to the conduit 10 side by the bubble pump action as described above, so the liquid level in the liquid tank 4 is lowered and the lower end opening of the connecting vibrator 15 is lowered. Since the main capillary tube 3 is open to the gas phase in the liquid tank 4 and the lower end opening of the main capillary tube 3 is located below the opening position of the connecting vibrator 15, the liquid refrigerant spouted from the refrigerant supply conduit directly flows into the capillary tube 5. The flow of liquid refrigerant to the refrigerator compartment evaporator 6 is completely stopped without any inflow.
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 mentioned above, the liquid refrigerant passes through the capillary tube 5 and flows through both the evaporators 6 and 8 in order.
The cooling effect of the refrigerator compartment and the freezer compartment is performed. FIG. 4 shows another embodiment of the present invention, in which the top end of the riser pipe portion 9a constituting the bubble pump pipe is bent into an inverted U-shape.
The bent side thereof is passed through from the top wall to the bottom wall of the liquid tank 4 to form a conduit 10 to the evaporator 8 for the freezer compartment, and the conduit 1
Capillary tube 12 on the evaporator 8 side for the freezer compartment
is connected to the conduit 10, and one or more pressure equalizing holes 33 are connected to the side wall of the conduit 10 and open to the upper gas phase part of the liquid tank 4.
is drilled.

Therefore, its operation is exactly the same as that of the first embodiment.

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. The liquid refrigerant may be allowed to 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, one connecting vibrator is inserted into the liquid tank through its top wall, and a main capillary tube connected to the condenser side and a predetermined evaporator tube are inserted into the connecting vibe. Since the capillary tube connected to the container side has been inserted and attached, all that is required is to attach the top bent part of the vertical riser tube and the nozzle of the connecting vibrator to the top wall of the liquid tank, making installation and welding very easy. It is easy to do so, and it is also relatively easy to fix both capillary tubes and the connecting vibrator, which has the effect that the workability can be greatly improved.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the refrigeration cycle of the refrigeration system of the present invention, Fig. 2 is an operation explanatory diagram, Fig. 3 is an electric control circuit diagram, and Fig. 4
The figure shows another embodiment of the invention. 1... Compressor, 2... Condenser, 3...
... Capillary tube, 4 ... Liquid tank, 5 ... Capillary tube, 6 ...
・Evaporator for refrigerator compartment, 8...Evaporator for freezer compartment, 9
... U-shaped conduit, 9a ... Vertical rising part, 13 ... Bubble pump heater, 15 ...
・Connected vibe.

Claims (1)

[Scope of Claims] 1. A plurality of evaporators, a liquid tank for storing liquid refrigerant discharged from a compressor and condensed by a condenser, and a liquid tank connected to the liquid tank and connected to the liquid refrigerant when the heater is activated. a bubble pump device that feeds the liquid refrigerant in the liquid refrigerant to a predetermined evaporator side; In the refrigeration system equipped with a conduit for feeding the liquid refrigerant in the tank to the other evaporator side, a connecting pipe penetrating the top wall of the liquid tank and opening only at the lower end is inserted into the liquid tank, The lower end opening is located below the opening in the liquid tank formed in the conduit connecting the bubble pump device and the predetermined evaporator, and
A refrigeration system characterized in that a main capillary tube connected to the condenser side and a capillary tube connected to the other evaporator side are inserted into the connecting pipe. 2. The refrigeration system according to claim 1, wherein the tip opening of the main capillary tube is located below the opening of the evaporator side capillary tube. 3. The refrigeration system according to claim 1, wherein the tip opening of the main capillary tube projects downward from the lower end surface of the connecting pipe.