JPS60245965A - Air conditioner - 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 FIELD OF INDUSTRIAL APPLICATION The present invention relates to an air conditioner using a non-azeotropic mixed refrigerant, and relates to a method for varying the refrigerant circulation concentration during heating and cooling.

Conventional configuration and its problems When comparing the capacity of an air conditioner during cooling and heating, more heating capacity is required than cooling capacity. Therefore, in recent years, proposals have been made to use a non-azeotropic mixed refrigerant as a refrigerant and change the refrigerant circulation concentration during heating and cooling to correspond to the capacity load. This is because the specific volume of the mixed refrigerant vapor becomes smaller as the concentration of the low boiling point refrigerant component (hereinafter referred to simply as concentration C) increases, so even if a compressor with the same suction volume is used, the circulation volume can be increased, increasing the capacity. This is because it is possible to increase the concentration, and conversely, if the concentration is lowered, the capacity can be lowered.

Therefore, the refrigerant circulation concentration is reduced during heating and cooling.

One example of such a system is shown in FIG.

In Fig. 1, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a first throttle device, 6 is a gas-liquid separator, 6 is a second throttle device, and 7 is an outdoor heat exchanger. container, 8.9 is a liquid receiver, 1
0 and 11 are heat exchangers, and 12 and 13 are conduits.

Next, its operation will be explained. First, during heating, the refrigerant circulates in the direction of the solid arrow in the figure, and the liquid receiver 8 is connected to the heat exchanger 10.
Since the liquid refrigerant is heated, the liquid refrigerant does not accumulate, but instead
The liquid refrigerant cooled by the heat exchanger 11 and separated by the separator 5 is collected therein. Next, during cooling, the refrigerant circulates in the direction of the dashed arrow in the figure, and the liquid receiver 9 is heated by the heat exchanger 11 so that no liquid refrigerant accumulates, and conversely, the liquid receiver 8 is heated by the heat exchanger 10. The cooled and separated refrigerant vapor in the separator 5 condenses and accumulates.

The concentration of the liquid refrigerant that accumulates in the receiver 8 or 9 during heating and cooling can be determined by the temperature-concentration diagram of the non-azeotropic mixed refrigerant shown in FIG. Figure 2 depicts the saturated vapor phase line and saturated liquid phase line at the internal pressure of the gas-liquid separator 6, and shows that the refrigerant filling concentration is 2,
Letting the temperature of the gas-liquid separator 5 be t, the interior of the gas-liquid separator 5 is represented by a point C, where a liquid refrigerant having a concentration X, shown by a point a, and a refrigerant vapor having a concentration y, shown by a dot, are mixed.

From Figure 2, the liquid refrigerant that accumulates in the liquid receiver 9 during heating has a concentration of X, and the liquid refrigerant that accumulates in the liquid receiver 8 during cooling is vapor with a concentration of y that has been cooled to below point d of temperature t''. .

Therefore, low concentration liquid refrigerant is stored during heating and high concentration liquid refrigerant is stored during cooling, so the concentration of refrigerant circulating in the cycle is high during heating and low during cooling. Sometimes a cycle of low capacity can be realized.

However, in terms of cycle capacity, while the above conventional example is sufficient for cooling, it becomes even more difficult for heating.

There was a problem in that a large capacity was required, and the concentration of the liquid refrigerant stored in the liquid receiver 9 during heating had to be lowered. Furthermore, there is a strong demand for miniaturization of air conditioners in terms of installation space, and the conventional example using two liquid receivers is a large device and does not meet this demand.

Purpose of the Invention The present invention is an air conditioning system that reduces the concentration of liquid refrigerant stored in a liquid receiver during heating, improves heating capacity, and reduces the number of liquid receivers to one in order to reduce the size of equipment. The aim is to provide an opportunity.

Structure of the Invention For the above-mentioned purpose, the present invention provides a liquid receiver capable of heat exchange with refrigerant pipes that become high and low temperature during heating and cooling operations, respectively. This is an air conditioner that uses a non-azeotropic mixed refrigerant by connecting the comrades and the liquid phase.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIG. In Figure 3, 1
7 to 7 are the same components as the conventional example.

14 is a liquid receiver located at approximately the same height as the separator 5; 16;
16 is a conduit connecting the gas phase parts of the gas-liquid separator 6 and the liquid receiver 14, and 17 is a conduit connecting the liquid phase parts.

The operation will be explained below.

First, during heating, the refrigerant circulates in the direction of the solid arrow, and the liquid refrigerant in the gas-liquid separator 6 passes through the conduit 1 and accumulates in the receiver 14 at approximately the same level as the liquid level.

The liquid refrigerant collected in the liquid receiver 14 is heated by the heat exchanger 16 to generate steam, and the steam returns to the gas-liquid separator 6 through the conduit 16 and circulates within the cycle.

Next, during cooling, the refrigerant circulates in the direction of the dashed arrow, and the refrigerant vapor separated in the gas-liquid separator 6 passes through the conduit 16, is cooled by the heat exchanger 16, and is condensed into the liquid receiver 14. The liquid accumulates at approximately the same level as the liquid separator 6.

The concentration of liquid refrigerant that collects in the liquid receiver 14 during heating and cooling will be explained using FIG. 2. Same as the explanation of the conventional example.

The pressure in FIG. 2 is the pressure inside the gas-liquid separator 6, the temperature of the gas-liquid separator 6 is t, and the liquid and vapor to be separated are at point a and point A.

During heating, the liquid refrigerant at point a separated by the gas-liquid separator 6 passes through the conduit 17 and is transferred to the heat exchanger 16 in the receiver 14 at a temperature t.
’. At point e, the refrigerant is separated into a liquid refrigerant having a concentration of X', which is indicated by a point f, and a refrigerant vapor having a concentration of y', which is indicated by a point q. Since the refrigerant vapor generated at point q returns to the cycle through the conduit 16, liquid refrigerant with a concentration The concentration of liquid refrigerant accumulated in

During cooling, the refrigerant vapor separated by the gas-liquid separator 6 and having a concentration y passes through the conduit 16 and enters the liquid receiver 14, and is transferred to the heat exchanger 1.
6, it is cooled to below the temperature t'', condenses and accumulates.

In the above embodiment, the gas-liquid separator 6 and the liquid receiver 14 are held at approximately the same level to allow natural circulation, but a liquid pump may be disposed between the gas-liquid separator 6 and the liquid receiver 14. By controlling the liquid level, the mounting height can be arbitrarily selected.

Effects of the Invention According to the present invention, it is possible to lower the concentration of the liquid refrigerant stored in the liquid receiver during heating, increase the refrigerant circulation concentration within the cycle, and obtain an air conditioner with high heating capacity. Furthermore, since only one liquid receiver is required, the device also has the effect of being able to be made smaller.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a conventional example, Fig. 2 is a temperature-concentration diagram of a non-azeotropic mixed refrigerant explaining the functions of a gas-liquid separator and a liquid receiver, and Fig. 3 is an embodiment of the present invention. FIG. 2 is a schematic configuration diagram of an air conditioner. 6... Gas-liquid separator, 14... Liquid receiver, 1
6... Heat exchanger, 16.17... Conduit. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
Figure 1? Figure 2 I B 47 yen, Noshu 1 I 2 To 2 Dan 1 Jibe t (Sister Figure 3

Claims (1)

[Claims] (1) The compressor, four-way valve, indoor heat exchanger, first throttling device, gas-liquid separator, second throttling device, outdoor heat exchanger, etc. are connected in a ring, and the temperature is high during heating and cooling operation. And a liquid receiver is installed to enable heat exchange with the refrigerant piping that becomes low temperature.
An air conditioner in which a gas phase part and a liquid phase part in the gas-liquid separator and the liquid receiver are connected, and a non-azeotropic mixed refrigerant is used as a refrigerant.