JPS59208355A - Refrigerator - 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 is directed to a refrigerant type refrigeration system filled with two types of non-azeotropic refrigerants having different saturation pressures.

A refrigerant type refrigeration system having a refrigerant circuit as shown in FIG.
(See the ``Refrigeration'' issue published by the Japan Refrigeration Association, July 1939 issue).

This refrigeration system is equipped with a compressor, a condenser, and an evaporator 3, and a gas-liquid separator is connected to the outlet side of the condenser λ to separate the gas region and liquid region of the gas-liquid separator. A heat exchanger B is provided to connect the gas pipe A and the liquid pipe W having an expander spout, respectively, and to exchange heat between the refrigerant flowing through the gas pipe and the liquid pipe. The outlet side of heat exchanger B, which is connected to A refrigerant circuit A is constructed by connecting the refrigerant circuit A to the refrigerant circuit A, and the refrigerant circuit A is filled with refrigerants having different saturation pressures.

A refrigeration system having such a configuration has a problem in operation under overload conditions. That is, in the evaporator 3, since the refrigerant containing a large amount of low boiling point refrigerant separated by the gas-liquid separator evaporates, a very large amount of heat is absorbed from the outside air, and as a result, the load on the compressor increases. It may increase and become inoperable. In order to prevent this, the compressor has been provided with an expensive capacity control function.

In view of the above points, the present invention aims to reduce the load on the compressor by changing the component ratio of the mixed refrigerant circulating in the refrigerant circuit, thereby improving overload characteristics. In order to achieve this object, the present invention has the above configuration! In a refrigerant-type refrigeration system, the resistance value of the expansion groove on the inlet side of the evaporator is made variable, and the liquid region of the gas-liquid divider is connected to the inlet side of the evaporator via an expansion mechanism. By increasing the resistance value of the expansion mechanism on the evaporator side during load, low boiling point refrigerant liquid is stored in the milk exchanger that exchanges heat between the refrigerant gas and refrigerant liquid separated by the gas-liquid separator, and the following This is characterized in that the mixed refrigerant circulating in the refrigerant circuit can contain a large amount of high boiling point refrigerant.

A refrigeration system according to an embodiment of the present invention will be explained below with reference to FIG.

The main components of the refrigerant circuit A in the refrigeration system of this embodiment are the same as those of the conventional example shown in FIG.

In Figure 2, the symbol / is a compressor, 2 is a condenser, 3 is an evaporator, Hiro is a gas-liquid separator, j and 7 are expansion mechanisms, O is a heat exchanger, g is a gas pipe, and ri is a liquid pipe. It is.

In this embodiment, as a feature of the present invention, the expansion mechanism 7 is connected in series with an electromagnetic on-off valve 10 and a capillary tube with a low resistance value, and a capillary tube with a high resistance value that bypasses these. The resistance value is made variable in response to the opening/closing operation of the electromagnetic on-off valve 10. First, the expansion mechanism 7 is constructed so that its resistance value becomes small or large when the electromagnetic on-off valve 10 is opened or closed. Note that, of course, a variable-type expansion valve may be used as the expansion mechanism 7.

Further, in the liquid pipe, a bypass circuit /3 is connected to the upstream side of the expansion mechanism j for supplying liquid refrigerant from the gas-liquid separator to the inlet side of the evaporator 30 during overload.

The bypass circuit /3 is provided with an expansion mechanism /ll and an electromagnetic on-off valve /3 in series. When the solenoid valve is closed,
It is opened and closed in reverse correspondence to the electromagnetic on-off valve 10 of the expansion mechanism 7.

To this refrigerant circuit, a high boiling point R/2 and a low boiling point n
A non-azeotropic mixed refrigerant consisting of one type of fluorocarbon refrigerant of /3B/ is charged.

This refrigeration system works as follows.

During normal operation, the electromagnetic on-off valve 10 is opened and the expansion mechanism 7
The resistance value of is made small, and the electromagnetic on-off valve /j is closed.

Mixed refrigerant gas discharged from the compressor (K/2 and R
/ J' B / ) is cooled in the condenser to 几/2
After most of the liquid is liquefied, R/3
The refrigerant gas is separated into a refrigerant gas containing a large amount of B/2 and a refrigerant liquid containing a large amount of R/2. These refrigerant gas and refrigerant liquid exchange heat with each other in the heat exchanger B and are liquefied and gasified, respectively. One is depressurized in the expansion mechanism 7 and then evaporated in the evaporator 3, and the other is evaporated in the evaporator 3. It is combined with the outlet refrigerant gas and sucked into the compressor.

In this case, B separated by the gas-liquid separator≠ is sent to the evaporator 3,
/3BIC low boiling point refrigerant) is supplied.

On the other hand, during overload operation, the electromagnetic on-off valve 10 is closed to set the resistance value of the expansion mechanism 7 to zero, and the electromagnetic on-off valve /j is opened to open the bypass circuit /3. 7 parts of the refrigerant liquid containing a large amount of 几/2 (high boiling point refrigerant) separated in the separator is depressurized and supplied to the inlet side of the evaporator 3, and the resistance value of the expansion mechanism 7 is increased. A refrigerant containing a large amount of n/3B/ (low boiling point refrigerant) is stored in the heat exchanger 6 in liquid form. Therefore, the mixed refrigerant circulating in the refrigerant circuit A contains more R/,2 (high boiling point refrigerant) than during normal operation, and the amount of heat absorbed by the evaporator 3 can be reduced. In other words, this is essentially a capacity control operation.

Note that the starting point of the bypass circuit /3 in this embodiment may be the outlet side of the heat exchanger B connected to the liquid pipe as shown by the dotted line. In this case, the expansion mechanism and /≠ are shared.

Another embodiment of the invention is shown in FIG.

In this case, in order to supply the separated refrigerant liquid from the gas-liquid separator≠ to the inlet side of the evaporator 3, the outlet side of the heat exchanger 3
This is done by connecting to the 0 inlet side. In addition,
The expansion mechanism 1 and 4L are commonly used.The other configurations and functions are the same as those of the embodiment shown in FIG. 1, so a description thereof will be omitted.

In addition, the effects of the refrigeration system of the present invention are listed below.

(1) During overload operation, the separated refrigerant liquid containing a large amount of high boiling point refrigerant from the gas-liquid separator Hiroshi is supplied under reduced pressure to the inlet side of the evaporator 3, and the low boiling point refrigerant is stored in the heat exchanger 6. Since the mixed refrigerant circulating through the refrigerant circuit contains more high-boiling point refrigerant than during normal operation, the amount of heat absorbed by the evaporator 3 can be suppressed. The overload operation limit can be expanded without providing the above.

(2) Since the load on the compressor during overload operation is reduced, the reliability of the compressor is significantly improvedQ! ! BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a refrigerant circuit diagram of a conventional refrigeration system, and FIGS. 2 and 3 are refrigerant circuit diagrams of two embodiments of the present invention.

／・・・・・・Compressor ノ・・・・・・Condenser 3...Evaporator G... Gas-liquid separator B...Heat exchanger 7)...Expansion mechanism /l A...Refrigerant circuit Applicant: Daikin Industries, Ltd.

Claims (1)

[Claims] /, compressor (1), condenser (.2) and evaporator (3)
), and a gas-liquid separator (l) on the outlet side of the condenser (2).
! -) and a heat exchanger (B) that exchanges heat between the refrigerant gas and refrigerant liquid separated by the gas-liquid separator (≠) are connected in series to form a refrigerant circuit (A), and the refrigerant In a refrigeration system in which the circuit (A) is filled with 17+2 types of refrigerants having different saturation pressures, an expansion mechanism (7) with a variable resistance value is provided on the inlet side of the evaporator (3), and the A refrigeration system characterized in that a liquid region of a liquid separator (Il-) is connected to an inlet side of the evaporator (3) via an expander groove CI<1>.