JPS5941753A - Cooling device - 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 The present invention relates to a cooling device such as a refrigerator having a plurality of cold storage chambers having different temperatures.

Conventionally, the cooling system in which a high-temperature storage and a low-temperature storage refrigeration unit are used for cooling is typically seen in cooling systems such as household refrigerator-freezers, and basically the cooling system shown in Figure 1 is It uses Kustem.

FIG. 1 is a schematic diagram showing the configuration of a conventional cooling device, in which 1 is a compressor, 2 is a condenser, 3 is a first capillary tube, 4 is a high-temperature evaporator,
T is the second capillary tube, 8 is the low temperature evaporator, 10 is the high temperature chamber, 11
12 is a low-temperature refrigerator and an accumulator.

Next, one operation will be explained.

In FIG. 1, the air is discharged from the compressor 1, and the condenser 2
The liquefied refrigerant liquid is depressurized in the first capillary tube 3 and partially evaporated in the high-temperature evaporator 4 disposed in the high-temperature refrigerator 10, at which time it performs a cooling effect in the high-temperature refrigerator 10. , high temperature evaporator 4
The two-phase gas-liquid refrigerant liquid that has exited is depressurized again in the second capillary tube 7, and the remainder is evaporated in a low-temperature evaporator 8 disposed within the low-temperature refrigerator 11, at which time the low-temperature refrigerator 11 is cooled. The refrigerant liquid exiting the low-temperature evaporator 8 is sucked into the compressor 1 via the accumulator 12. Temperature control in high and low temperature storage 10.11 is performed in high temperature storage 10.11. This is performed by driving and stopping the compressor 1 using a temperature controller (not shown) disposed in either of the low-temperature refrigerators 11.

In the conventional example with the above configuration, the suction pressure of the compressor 1 depends on the evaporation pressure of the low-temperature evaporator 8.
No matter how high the evaporation pressure of the high-temperature evaporator 4 is, the coefficient of performance of the compressor 1 is extremely poor, and the cooling system is forced to operate inefficiently. In addition, as mentioned above, since the temperature inside the refrigerator must be adjusted depending on the temperature inside either the high or low temperature chambers 10 and 11, there is a drawback that the temperature inside the other chamber is left to its own devices. .

On the other hand, in order to enable independent control of the internal temperature of each refrigerator, only one evaporator is used, so that the temperature inside the high-temperature refrigerator 10 is controlled by damper control, and the temperature inside the low-temperature refrigerator 10 is controlled by damper control.
Temperature 1 is the drive of compressor 1.

In recent years, cooling systems that rely on stopping have become common in household refrigerators and the like. Although this method allows for independent control of the temperature inside both chambers, the evaporation temperature of the evaporator still depends on the temperature of the low-temperature chamber 11, so as described for the conventional example, the efficiency of the cooling system is extremely low. It's still bad. Also, when using this method,
The cooling surface temperature of the evaporator that cools the high-temperature refrigerator 10 is lower than the low-temperature refrigerator 11
As a result, the inside of the high-temperature storage 10 becomes too dry, and the amount of frost on the evaporator becomes large, necessitating frequent defrosting.

This invention was made to improve the various drawbacks of the above-mentioned conventional devices, and significantly changes the conventional cooling systems of home refrigerators and the like.

This invention will be explained below.

FIG. 2 is a schematic diagram illustrating an embodiment of the present invention. In this figure, 5 and 6 are the first . A second hexagonal valve 7 is a second capillary tube that communicates with a low-temperature evaporator 8 disposed in the low-temperature storage 11 and is in a refrigerant piping line between the outlet of the first capillary tube 3 and the second solenoid valve 6. will be placed in

9 is a check valve, 13 is a high-temperature refrigerator fan disposed inside the high-temperature refrigerator 10, and 14 is a low-temperature refrigerator fan disposed in the low-temperature refrigerator J111, and the other components are the same as in FIG.

The embodiment of FIG. 2 resembles a conventional refrigeration system with parallel evaporators, but is fundamentally different. That is, first, the pressure adjustment unit provided in the conventional parallel cooling system for matching the evaporation pressures of the different cap generators 4 and 8 to the same suction pressure does not exist after the high temperature evaporator 4 of the present invention. . In other words, the characteristic operation of the present invention is that the refrigerant liquid does not flow into the cap generators 4 and 8 at the same time. The specifications of each system are such that in the combination of the heat source side of the compressor 1 and condenser 2 and each system alone, the evaporation temperature (pressure) of the tube cover generators 4 and 8 is, for example, 130°C for the low-temperature evaporator 8 and 30°C for the high-temperature evaporator. The point is that the temperature of the container 4 is set to 0°C.

In other words, the present invention operates each of the low temperature and high temperature systems independently, or in other words, distributes the refrigerant liquid exiting the condenser 2 to the lid generators 4 and 8 in chronological order to cool the high temperature storage 10. By maintaining the evaporation temperature (pressure) of the high-temperature evaporator 4 at a high level, the coefficient of performance of the compressor 1 is improved and the operating efficiency of the refrigeration system is improved.

FIG. 3 is a block diagram of the operation control circuit. Figure 3 Vc
℃, 21 and 22 are temperature detection sensors arranged in the high temperature point io and the low temperature storage 11, respectively, 23 and 24 are temperature controllers, and 25 is an off signal of the temperature controller 23 and an on temperature controller 240. An AND circuit such as an AND gate established by a signal, and 26 an OIL f established by either the output of the AND circuit 25 or the ON signal of the temperature controller 230.
2T is a high temperature storage switch, 28 is a low temperature storage switch, 1, 5, 6, 13.14 is a compressor, the first solenoid valve, the second solenoid valve, as in FIG. They are a high temperature storage fan and a low temperature storage fan.

Next, the operation of the embodiment shown in FIG. 2 will be explained with reference to the block diagram of the operation control circuit shown in FIG. 3.

The internal temperatures of both chambers detected at regular intervals by the temperature detection sensors 21 and 22 are input to temperature controllers 23 and 24. When the temperature inside the high temperature warehouse 1o is high, the temperature controller 23
The ON signal is outputted to the high-temperature storage fan 13, the eleventh anal valve 5, and the compressor 1 via the OR circuit 26, causing both to operate.

When this is done, the refrigerant liquid evaporates in the high-temperature evaporator 4 in the high-temperature refrigerator 1o, thereby performing a cooling action on the high-temperature refrigerator 1o.

At this time, even if the temperature inside the low-temperature refrigerator 11 becomes high (and the ON signal δ is output from the temperature controller 24), the AND circuit 25 is not established as shown in FIG. 3, so the second solenoid valve 6 does not open. , the low-temperature refrigerator 11 is not cooled. However, when the high-temperature refrigerator 10 is cooled and reaches a predetermined value, the temperature controller 23 outputs an off signal and closes the high-temperature refrigerator fan 13 and the first solenoid valve 5. If the off signal is output from the temperature controller 24 of the refrigerator 11, the compressor 1 will stop.
If the internal temperature is high and the ON signal is output from the temperature controller 24, the AND circuit 25 will be established by this ON signal and the OFF signal from the temperature controller 23, so the OR circuit 26 will cause the compressor 1 to start operating. Subsequently, the second electromagnetic valve 6 and the low temperature refrigerator fan 14 are also opened by the logical product output, thereby cooling the low temperature refrigerator 11.

If the temperature of the high-temperature warehouse 10 rises above the predetermined value again during the cooling operation at the low temperature fL11, an ON signal from the temperature controller 23 will be sent to the
The cooling operating pressure of the K warmer 10 is switched. When the internal temperature of both chambers falls below a predetermined value, the temperature controllers 23 and 24 each issue an off signal, and the first... Second solenoid valve 5, 6 and both fans 13.1
4 is closed and the compressor 1 is stopped.

In addition to the above control, when the door of the high-temperature refrigerator 10 or the low-temperature refrigerator 11 is opened, the high-temperature refrigerator switch 27 or the low-temperature refrigerator switch 28 outputs an off signal to the temperature controller 2, 3, or 24, and when this off signal continues for a certain period of time, , each temperature control 523.2
4 outputs an off signal and returns to the above control.

Next, the effects of the invention described above will be explained using specific numerical values using a household refrigerator as an example.

Normally, the temperature of the low-temperature compartment (freezer) 11 of a domestic refrigerator-freezer is about -18°C, and in order to achieve this internal temperature, an evaporation temperature of -25 to -30°C is required. On the other hand, the temperature of the high temperature storage (refrigeration room) 10 is about 3°C, and the evaporation temperature is about 0 to -5°C. Further, the cooling load ratio between the two is about 4:6, and the load on the high temperature storage (refrigeration room) 10 is greater. In addition, when comparing the coefficient of performance, that is, the operating efficiency, of the compressor 1 at a temperature of -25 to -30°C and a temperature of 0 to -5°C, the latter is about 2 to 2.5 times the former.

In other words, when the embodiment of this invention explained in FIGS. 2 and 3 is applied to a household refrigerator-freezer, for example, 60
% of the cooling load in the refrigerator compartment can be absorbed by the operating efficiency of the compressor 1, which is more than twice that of the conventional one, and it can be seen that a large energy saving effect can be expected. Further, cooling operation when the door is opened can be prevented, and continuous cooling operation only on the high temperature refrigerator 10 side can be prevented.

In the above embodiment, the second electromagnetic valve 6 is placed in the low temperature system to simplify the explanation, but since the flow resistance of the second capillary tube T for low temperatures is significantly larger than that for high temperatures, The second solenoid valve 6 does not need to be inserted.

Further, although the above explanation has been made only for a load having two systems, it goes without saying that the present invention can be applied to loads having more systems.

As explained above, in the present invention, the refrigerant liquid is distributed in time series to the filters having different evaporation pressures, so that the operating efficiency of the compressor and the entire refrigeration system can be dramatically improved. In addition, it is possible to independently control the temperature inside each compartment, and it is also possible to prevent cooling operation when the door is open and continuous cooling operation only in the high-temperature compartment, and furthermore, there is no need for pressure regulating valves, etc. In addition, since the high-temperature storage is cooled at an appropriately high evaporation temperature, there are no problems such as drying of the high-temperature storage.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional cooling device, Fig. 2 is a schematic diagram showing an embodiment of the present invention, and Fig. 3 is a block diagram of an operation control circuit to explain the operation of Fig. 2. be. In the figure, 1 is a compressor, 2 is a condenser, 3 is a first capillary,
4 is a high temperature evaporator, 5 is a first solenoid valve, 6 is a second solenoid valve, 7
is a second capillary, 8 is a low temperature evaporator, 9 is a check valve, 10 is a high temperature storage, 11 is a low temperature storage, 12 is an accumulator, 13 is a high temperature storage fan, 14 is a low temperature storage fan, 21.22 is a temperature detection sensor , 23 and 24 are temperature controllers, 25 is an AND circuit, 26 is an OR circuit, 27 is a high temperature storage switch, and 28 is a low temperature storage switch. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 1 Figure 2 1 Figure 3

Claims (2)

[Claims] (1) A cooling device in which the high BS and low temperature storages each include a high temperature evaporator and a low temperature evaporator, and cools the refrigerant liquid from the compressor by passing it through the high temperature evaporator and the low temperature evaporator through a first capillary, A 'fJL magnetic valve is arranged downstream of the high temperature evaporator ψ, a second capillary is arranged upstream of the low temperature evaporator,
A high-temperature refrigerator fan for agitating the air in each refrigerator by connecting in parallel the series connection of the high-temperature evaporator and the solenoid valve and the series connection of the second capillary tube and the low-temperature evaporator; A low-temperature storage fan is provided, a temperature detection sensor is provided in each of the high-temperature storage and the low-temperature storage, a temperature controller is provided for outputting an on signal and an off signal in accordance with the output of these temperature detection sensors, and each door is opened. A high-temperature storage switch and a low-temperature storage switch are provided to issue an off signal from each of the temperature controllers, and furthermore, the cooling of the high-temperature storage is operated with priority over the cooling of the low-temperature storage, and the temperature controller of the high-temperature storage A cooling device comprising: an operation control circuit that causes the solenoid valve to open and the high-temperature refrigerator fan to operate in response to an on signal, and causes the low-temperature refrigerator fan to operate when the low-temperature refrigerator is being cooled. (2) The operation control circuit outputs an off signal from the temperature controller of the high-temperature refrigerator when the off signal from the high-temperature refrigerator switch that is output when the door of the high-temperature refrigerator is opened continues for a certain period of time, and also outputs an off signal from the temperature controller of the high-temperature refrigerator. Claim No. 1, characterized in that when the off signal from the low temperature refrigerator switch that is output when opened continues for a certain period of time, an off signal is output from the temperature controller of the low temperature refrigerator.
) Cooling device described around.