JPS60126545A - Refrigeration cycle - 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 [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. 1987-70954 has been proposed.

In this example, when setting the normal operating temperature, the refrigerant is separated into a refrigerant gas containing many low-boiling components and a refrigerant liquid containing many high-boiling components in the refrigerant container, and the refrigerant liquid containing many high-boiling components is sent to the circuit. When it was desired to set a lower temperature for rapid freezing, etc., the refrigeration cycle was configured with the mixed ratio sealed without mixing.

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

Figure 1 shows a conventional example of this. Valve 6 (6) is a refrigerant container.

During normal operation, open the solenoid valve (5) and open the condenser (2).
One of the non-azeotropic mixed refrigerants cooled in the depressurizer (
The refrigerant flows through the evaporator (4) through the evaporator (3α), but the external refrigerant flows through the magnetic valve (5) to the refrigerant container (6), where it separates the refrigerant gas containing many low-boiling components and the high-boiling components. The refrigerant gas containing many low-boiling components is stored above the refrigerant container, and the refrigerant gas containing many high-boiling components is
, 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 solenoid 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 up to now is expelled from the inside of the refrigerant container (6), and the mixture ratio of the sealed mixture is changed. In other words, since the refrigerant gas containing many low boiling point components circulates through the circuit, the temperature of the evaporator (4) must be low, or the refrigerant gas containing many low boiling point components must be stored in the refrigerant container (6) during normal operation. Therefore, a pressure-resistant container with an extremely 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 a 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. A refrigerant gas containing a large amount of low boiling point 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, (2CL) is a main condenser,
(2b) is a sub-condenser, (3) is a pressure reducing device, (4) is an evaporator, (5α) and (5b) are an upper blade valve and a lower valve consisting of electromagnetic valves, and (7) is a refrigerant container.

During normal operation, the upper valve (5a) is closed and the lower valve (5a) is closed.
5b), the non-azeotropic mixed refrigerant gas cooled in the main condenser (2α) passes through the pipe (8) and enters the refrigerant container (7) from above. The sub condenser (2) passes through the pipe (9) and the lower valve (5b).
b), and the non-azeotropic mixed refrigerant flows through the refrigerant circuit at the mixing ratio at the time of sealing.

On the other hand, when low temperature is required, the upper valve (5a) is opened and the lower valve (5b) is closed.
The cooled refrigerant gas 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 (7), 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 point components passes through the pipe α1 provided at the upper end of the refrigerant container (7) and the upper valve (5α) to the sub I#:
Since the refrigerant flows to the condenser (2b), a refrigerant containing many low boiling point components flows into the refrigerant circuit, thereby obtaining a low temperature.

〔Effect of the invention〕

As mentioned 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, so the container This has the effect of significantly reducing the size.

[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, (2(
L') is the main condenser, (2b) is the sub-condenser, (3-in (3α
), (3b) are pressure reducing devices, (4) are evaporators, (5), (
5a) and (5b) are electromagnetic valves, and (6L (7) is a refrigerant container. The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A compressor, a main condenser, and a refrigerant container are connected in sequence, and a sub-condenser is connected to the upper and lower ends of the refrigerant container via an upper valve and a lower valve, respectively, and the sub-condenser, a pressure reducing device, and an evaporator are connected to each other. The refrigerant circuit is connected to the compressor through the refrigerant circuit, and a non-azeotropic mixed refrigerant is used as the refrigerant gas. During a normal refrigeration cycle, the upper valve is closed and the lower valve is opened to seal in the non-azeotropic mixed refrigerant at °C. A refrigeration cycle is formed with the mixture ratio □, and during rapid freezing, the above-mentioned upper valve is opened and the lower valve is closed, and the refrigerant liquid containing a high boiling point refrigerant and the refrigerant scum containing a low boiling point refrigerant are separated in the above-mentioned refrigerant container. A refrigeration cycle characterized by separating the refrigerant liquid containing a high boiling point refrigerant and storing it in the lower part of the refrigerant container, and allowing the refrigerant scum containing a low boiling point refrigerant to flow through the circuit.