JPS5941766A - 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, a system in which a high-temperature floor and a low-temperature chamber are cooled by a single refrigeration unit is typically seen in cooling systems such as household refrigerator-freezers, and basically the cooling system shown in Figure 1 Adopt System Ke (・ro).

Figure 1 is a schematic diagram of a conventional cooling tank, where 1 is a compressor, 2 is a condenser, 3 is a first capillary M tube, 4 is a high-cost evaporator,
T is the second capillary tube, 8 is the low temperature evaporator, 10 is the hot bed, 11
is a low-temperature refrigerator, and 12 is a 7-cumulator.

Next, the operation will be explained j7).

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 3 and partially evaporated in the high-temperature evaporator 4 disposed within the high-temperature bed 10, and at the same time performs a cooling action within the high-temperature bed 10. The gas-liquid two-phase refrigerant liquid that exits the high-temperature evaporator 4 is depressurized again in the first capillary tube 3, and the remainder is evaporated in the low-temperature evaporator 8 disposed in the low-temperature chamber 11. Cool down 11. The refrigerant liquid exiting the low-temperature evaporator 8 is sucked into the compressor 1 via the key mulrator 12. Temperature in high and low temperature storage 10.11 [1st theory is crystal temperature storage 10. The compression low 1 is driven by a temperature L11 regulator (not shown) disposed in either of the low-temperature refrigerators 11;
This is done by stopping the robot.

In the conventional example of the 4iff configuration as described above, the suction pressure of the compressor 1 depends on the evaporation pressure of the low-temperature evaporator 8. The coefficient of performance (coefficient of performance) was very poor, and even with a 7-stem cooling system, we were forced to operate inefficiently.Also, as mentioned above, the temperature inside the refrigerator was adjusted to either high or low temperature. On the other hand, in order to be able to independently control the temperature inside each refrigerator, we installed 71 evaporators. , thereby making it highly concentrated 10
The temperature inside the refrigerator is controlled by damper control, and the temperature of the low-temperature refrigerator 11 is controlled by the compressor 1.

Cooling systems that perform shutdown operations have also become common in household refrigerators and the like in recent years. Although this system allows for independent control of the internal temperatures of both chambers, the evaporation temperature of the evaporator still depends on the temperature of the low-temperature chamber 115, so as mentioned 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 concentration 10 is low temperature storage 11
If it is lower than 1, there will be a problem of excessive drying in the high concentration 10, and the amount of frost on the evaporator will be large, making it necessary to remove f'if more frequently than 1. This invention was made in order to improve the defects of the above-mentioned conventional home refrigerators, which have drawbacks such as It is something that can be changed 4).

The present invention will be explained below.j 6 +1 Fig. 2 is a schematic diagram showing one embodiment of the present invention. In this figure, 5.6 is the first. The second tun eel valve, I, is a second capillary tube, which communicates with the low temperature evaporator 8 disposed in the low temperature storage 11, and is connected to the 2'FrL magnetic valve 6 at the outlet of the first capillary tube 3. A check valve 9 is disposed in the refrigerant piping, and the other parts are the same as those shown in FIG.

The embodiment of FIG. 2 is similar to, but fundamentally different from, a conventional refrigeration system with parallel evaporators.

That is, first, the pressure adjustment section provided in the conventional parallel cooling system for matching the evaporation pressures of different evaporators 4.8 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 this invention is that the refrigerant liquid does not flow into the generators 4 and 8 at the same time.
, T, low temperature evaporator8. A low temperature system consisting of a check valve 9 and a first solenoid valve 5. The specifications of each system in the high-temperature system consisting of the first capillary tube 3° and the high-temperature evaporator 4 are as follows:
In the heat source side of the condenser 2 and each system individually, the evaporation temperature (pressure) of the generators 4 and 8 is set such that, for example, the evaporation temperature (pressure) of the low-temperature evaporator 8 is -30°C and the high-temperature evaporator 4 is 0°C. It is located at the perforation point set to .

In other words, this invention operates the low and high temperature systems individually, in other words, distributes the refrigerant liquid coming out of the condenser 2 to the generators 4 and 8 in a chronological order, and cools the highly concentrated 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. In FIG. 3, 21.22 is the high concentration 10. Temperature detection sensors respectively arranged in the low temperature storage 11, 23 and 24 a temperature controller, 25 an AND circuit such as an AND gate formed by the temperature controller 23σ off signal and the temperature controller 240 ONI No. 3; 26 is an OR circuit such as an OR gate established by either the output of the AND circuit 25 and the ON signal of the temperature controller 230, and 27 is a temperature detection sensor 21 on the high temperature side.
This is a temperature memory that stores the temperature of the spider, and 1.5°6 is the same as in Fig. 2 (compressor, first solenoid valve, and second solenoid valve).

Next, the operation of the embodiment shown in FIG. 2 will be explained with reference to block 17 of the operation control circuit shown in FIG.

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. At this time, the temperature from the temperature detection sensor 21 on the high temperature side is stored in the temperature memory 27.

When the temperature in the high temperature side 10 is high, the temperature controller 23 outputs an on signal to the first electric/double valve 5 and the compressor 1 via the OR circuit 26 to operate both.

When this is done, the refrigerant liquid evaporates in the high-temperature evaporator 4 in the high-temperature side 10, thereby performing a cooling action 7 on the high-temperature side 10.

0, the temperature inside the low-temperature refrigerator 11 is high, and even if the temperature controller 24 is turned on, the AND circuit 25 is not established as shown in FIG. 3, so the second solenoid valve 6 is Doesn't open,
The low temperature storage 11 is not cooled (.However, when the high temperature side 10 is cooled and reaches the predetermined cage 6, the temperature controller 23 outputs an off signal and closes the first solenoid valve 5. At that time, the temperature controller 2
If the off signal is output from 4, compressor 1 will stop. However, at this time, the temperature inside the low temperature refrigerator 11 is high (temperature controller 24
If an on signal is output from the on signal, the logical product Erjl path 25 is established by this on signal and the off signal from the temperature controller 23, so the logical sum circuit 26 continues to interrupt the compressor 1 & collection operation, and the second solenoid valve 6 also ^(S storage product output iC opens and the low temperature refrigerator 11 is cooled by 1t.

In this way, if the temperature on the high temperature side 10 rises by the predetermined value J-9 again during the CI-filtration operation of the low-temperature storage 11, the ON signal from the temperature controller 23 will cause the temperature to rise as described above. The cooling operation of the high @ warehouse 10 is switched.

If the internal temperatures of both chambers are below a predetermined value, the temperature controller 23.
24 each output an off signal, and the first . The second solenoid valves 5 and 6 are closed and the compressor 1 is stopped. In addition to the above control, high temperature side 10
When cooling, opening the door, overloading, etc., the high temperature side 10
temperature detection sensor 21 at regular intervals [σ] to prevent continuous cooling operation.

When the temperature difference according to the value in the temperature memory 2T (memorize temperature U)-16 exceeds a certain one-run value, the temperature controller 23 on the high temperature side 10 outputs an off signal and returns to the above control. .

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

Normally, the low temperature of a household refrigerator-freezer* (the temperature of the freezer floor 1 is around -18"C, and in order to achieve that internal temperature -
Evaporation temperatures of 25 to -30°C are required. On the other hand, the temperature on the high temperature side (refrigerator) 10 is about 3℃, and the evaporation temperature is sufficient at 0 to -5''0. The load on side (refrigeration room) 10 is heavier.In addition, the coefficient of performance, or operating efficiency, of compressor 1 is compared between -25 to -30°C and θ to -5°C, and in this case , 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, for example, a home-use Ginjo refrigerator, 60
% of the cooling load in the refrigerator compartment can be reduced to absorption τ with the operating efficiency of the compressor 1 more than twice that of the conventional system, and it can be seen that a large energy saving effect can be expected. Further, it is possible to prevent continuous cooling operation only on the high temperature side 10 due to opening of the door on the high temperature side 10 or excessive load.

In the above embodiment, the second solenoid valve 6 is installed in the low temperature system to simplify the explanation, but the R and conduction resistance of the second capillary tube T for low temperature use are significantly larger than those for high temperature use. 1 yaw, so the second solenoid valve 6 for the low temperature system does not have to be installed.

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, this invention distributes refrigerant liquid to evaporators with different evaporation pressures in chronological order, and gives priority to the cooling of the high temperature side over the cooling of the low temperature storage.
6 and the operating efficiency of the entire refrigeration system can be dramatically improved1.In addition, it is possible to independently control the temperature inside each refrigerator, and it is also useful for opening the door when cooling the high temperature side)1
It is possible to prevent excessive continuous cooling operation, and there are great effects such as eliminating the need for pressure regulating valves and the like. Furthermore, since the high-temperature side is cooled at an appropriately high evaporation temperature, problems such as drying of the high-temperature side occur.7. (
It has the following advantages.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a conventional cooling device, FIG. 2 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram of an operation control circuit for explaining the operation of FIG. 2. It is. In the figure, 1 is the compressor, 2 is the condenser, and 3 is the first hair 1Vl.
l pipe, 4 is a high temperature evaporator, 5 is a first solenoid valve, 6 is a second solenoid valve, 7 is a second capillary tube, 8 is a low temperature evaporator, 9 is a check valve, 1
0 is a high temperature storage, 11 is a low temperature storage, 12 is a 7 storage unit, 2
1.22 is a temperature detection sensor, 23.24 is a temperature controller,
25 is an AND circuit, 26 is an OR circuit, and 2T is a temperature memory. Note that the numeral 4 in the drawings indicates the same or equivalent parts. Agent Kazuno Kazu (1 other person) Figure 1

Claims (1)

[Claims] A high-temperature evaporator and a low-temperature evaporator are provided in the high-temperature floor and the low-temperature storage, respectively, and the refrigerant liquid from the compressor is cooled by passing it through the high-temperature evaporator and the low-temperature evaporator through the first capillary tube. A solenoid valve χ is arranged in the downstream part 11 of the evaporator, a second capillary tube IIK is arranged in the upstream part of the low-temperature evaporator, and the high-temperature evaporator and the solenoid valve are connected in series, and the second capillary and the low-temperature evaporator are connected in series. 011 high-temperature storage and low-temperature storage are each connected in parallel, and each temperature controller is provided to output an on signal and an off signal according to the output of these temperature detection sensors. Further, the cooling of the high-temperature floor is given priority to the cooling of the low-temperature storage, and when the temperature difference in the high-temperature storage over a certain period of time exceeds a certain value, the high-temperature floor is cooled. The cooling device is characterized by being provided with a control circuit that turns the output of the temperature controller into an OFF signal.