JPH0247672B2 - REITOSAIKURU - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a refrigeration cycle using a non-azeotropic mixed refrigerant.

[Prior art]

As a conventional example of a so-called two-temperature control refrigeration cycle using a non-azeotropic mixed refrigerant so that two temperatures can be set, for example, Japanese Patent Application No. 70954/1982 (Japanese Patent Application Laid-open No. 197762/1982) has been proposed.

In this example, when setting the normal operating temperature,
The refrigerant is separated into a refrigerant gas containing many low boiling point components and a refrigerant liquid containing many high boiling point components in the refrigerant container, and the refrigerant liquid containing many high boiling point components is passed through the circuit. When trying to set the temperature, the refrigeration cycle was constructed using a mixture ratio that was sealed without separation.

Therefore, in order to set the normal operating temperature, it is necessary to store a refrigerant gas containing many low-boiling components in a container, which requires a very large capacity.

FIG. 1 shows this conventional example, in which 1 is a compressor, 2 is a condenser, 3a and 3b are pressure reducing devices, 4 is an evaporator, 5 is a solenoid valve, and 6 is a refrigerant container.

During normal operation, the solenoid valve 5 is opened and the condenser 2
One of the cooled non-azeotropic refrigerants flows into the evaporator 4 through the pressure reducing device 3a, while the other refrigerant flows into the refrigerant container 6 through the solenoid valve 5, where it It is separated into refrigerant gas and refrigerant liquid containing many high boiling point components, the refrigerant gas containing many low boiling point components is stored above the refrigerant container, and the refrigerant liquid containing many high boiling point components flows from below the refrigerant container 6 to the pressure reducing device 3b. . Therefore, the temperature of the evaporator 4 is set to a relatively high temperature because a refrigerant containing many high boiling point components flows in the circuit.

Next, when the electromagnetic valve 5 is closed, the pressure inside the refrigerant container 6 becomes low, and the refrigerant gas containing many low-boiling point components that has been stored until now is discharged from the inside of the refrigerant container 6, and the mixture ratio of the sealed mixture, that is, the amount of low-boiling components is high. Since the refrigerant gas circulates through the circuit, the temperature of the evaporator 4 can be lowered. In this way, the temperature of the evaporator 4 can be set in two stages by operating the solenoid valve 5, but during normal operation, the refrigerant gas containing many low boiling point components must be stored in the refrigerant container 6, which causes an emergency. A pressure-resistant container with a large capacity was required.

[Summary of the invention]

This invention provides an upper valve and a lower valve at the upper and lower ends of the refrigerant container, respectively, and when the upper valve is opened and the lower valve is closed, a refrigerant liquid containing a high boiling point refrigerant is stored in the refrigerant container, thereby reducing the boiling point. A refrigerant gas containing a large amount of refrigerant is passed through the circuit to perform rapid freezing.

[Embodiments of the invention]

FIG. 2 is a refrigerant circuit diagram showing one embodiment of the present invention.

In the figure, 1 is a compressor, 2a is a main condenser, 2
b is a sub-condenser, 3 is a pressure reducing device, 4 is an evaporator, 5
A and 5b are upper and lower valves which are electromagnetic valves, and 7 is a refrigerant container.

In normal operation, by closing the upper valve 5a and opening the lower valve 5b, the non-azeotropic mixed refrigerant gas cooled in the main condenser 2a passes through the pipe 8 and enters the refrigerant container 7 from above. 7 and the sub-condenser 2b through the lower valve 5b.
The non-azeotropic refrigerant mixture flows through the refrigerant circuit at the mixing ratio at the time of sealing.

On the other hand, when low temperature is required, the main condenser 2a is heated by opening the upper valve 5a and closing the lower valve 5b.
The cooled refrigerant gas is separated in the refrigerant container 7 into a refrigerant gas containing many low-boiling components and a refrigerant liquid containing many high-boiling components, and the refrigerant liquid is stored in the lower part of the refrigerant container 7. On the other hand, the refrigerant gas containing many low-boiling components flows through the pipe 10 provided at the upper end of the refrigerant container 7 and the upper valve 5a to the sub-condenser 2b, so that the refrigerant containing many low-boiling components flows into the refrigerant circuit. Low temperatures are obtained.

〔Effect of the invention〕

As explained above, in the conventional example, the unnecessary refrigerant gas was stored in a gaseous state at the intended temperature, but in this invention, it is stored in a liquid state, which significantly reduces the size of the container. It has the effect of making it smaller.

[Brief explanation of drawings]

FIG. 1 is a refrigerant circuit diagram of a conventional example, and FIG. 2 is a refrigerant circuit diagram showing an embodiment of the present invention. In the figure, 1 is a compressor, 2 is a condenser, 2a is a main condenser, 2b is a sub-condenser, 3, 3a, 3b are pressure reducing devices, 4 is an evaporator, 5, 5a, 5b are solenoid valves,
6 and 7 are refrigerant containers. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A non-azeotropic mixed refrigerant containing a high-boiling point refrigerant and a low-boiling point refrigerant at a predetermined mixing ratio is used. During normal freezing, the non-azeotropic mixed refrigerant at the above-mentioned predetermined mixing ratio is used as the refrigerant gas, and during rapid freezing, the above-mentioned low-boiling point refrigerant is used. In a refrigeration cycle configured to flow a large amount of refrigerant gas into each refrigerant circuit, the refrigerant circuit is connected to a compressor,
The main condenser, the refrigerant container for refrigerant liquid refrigerant gas separation are connected in sequence, and the upper and lower ends of the refrigerant container outlet side are
A sub-condenser is connected through an upper valve that is closed during normal freezing and opened during rapid freezing, and a lower valve that is opened during normal freezing and closed during rapid freezing, respectively;
Furthermore, a refrigeration cycle characterized in that the sub-condenser, the pressure reducing device, the evaporator, and the compressor are connected in sequence.