JPS6339826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigeration cycle for an air conditioner.

Conventional structure and its problems Conventionally, in an air-conditioning reversible refrigeration cycle including a four-way switching valve, in order to effectively utilize the cold energy of condensed water during cooling, a compressor a, a four-way switching valve b, and a heat source are used as shown in Figure 1. side heat exchanger c, usage side heat exchanger d, first
A refrigerant circuit is constructed in which a capillary e and a second capillary f are connected by piping, and the piping g between the first capillary e and the second capillary f is immersed in condensed water i collected in a water pan h. It exchanges heat. It is known that this heat exchange effect increases the cooling capacity during the refrigeration operation as indicated by the solid line arrow in the figure.

However, in this structure, since the refrigerant to be heat exchanged has an intermediate temperature after being depressurized in the first capillary tube e, there is a small temperature difference with the condensed water i, and the refrigerant is not effectively cooled.

In order to eliminate this drawback, as shown in FIG.
The heat source side heat exchanger c and piping k from the side end to the end of the four-way switching valve b are immersed in condensed water i stored in a water pan h, and are dispersed by a fan for heat exchange. A structure is also known that increases the cooling capacity during cooling operation, which is indicated by the solid line arrow, but with this structure, during heating operation, which is indicated by the broken line arrow in the figure, the temperature of pipe k falls below zero and the condensed water i. This has the major drawback of preventing damage to the rotation of the fan on the outside of the room. Note that in FIG. 2, parts having the same functions as those in FIG.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims to improve the performance during cooling operation and to prevent damage to the outdoor fan even during heating operation.

Structure of the Invention In order to achieve this object, the present invention provides a branched pipe with a sealed tip in the middle of a refrigerant pipe leading to a heat source side heat exchanger, and a pipe with a sealed tip at the center of the pipe is placed at a height higher than the branched part. furthermore, a porous material or a fibrous material is provided on the inner circumferential surface of the tube, extending from the tip of the tube beyond the highest point to a position higher than the branching portion; The tip of the tube is immersed in condensed water.

This configuration allows effective heat exchange between the condensed water and the high-temperature, high-pressure refrigerant.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
This will be explained with reference to FIG.

In the figure, 1 is a compressor, 2 is a four-way switching valve,
3 is a heat exchanger on the heat source side, 4 is a heat exchanger on the user side, and 5 is a capillary tube, which are connected by piping as shown in FIG.
It constitutes a refrigeration cycle. During cooling operation, the four-way switching valve 2 is connected as shown by the solid line, and the direction in which the refrigerant flows is as shown by the solid arrow. Further, during heating operation, the four-way switching valve 2 is connected as shown by the broken line, and the direction in which the refrigerant flows is the direction shown by the broken line arrow. Reference numeral 6 denotes a pipe whose one end is sealed and whose other end is branched and connected to piping 7 between the heat source side heat exchanger 3 and the four-way switching valve 2, and there is a connecting part between the connecting part and the tip of the pipe. A curved path portion 6a is formed at a higher position than the tip of the tube. Further, the tip of the tube 6 is immersed in condensed water 9 stored in a water tray 8. Further, as shown in FIGS. 4 and 5, the inner surface of the tube 6 is covered with porous or fibrous material from the tip to a position higher than the connecting portion and beyond the highest point of the curved path 6. A wick 10 is provided.

In the above configuration, when the cooling operation is started, the refrigerant in the piping 7 turns into high-temperature, high-pressure superheated steam, while the condensed water 9 that is condensed in the user-side heat exchanger 4 and stored in the water tray 8 flows into the piping 7. The temperature is sufficiently lower than that of the refrigerant, and the superheated vapor refrigerant is cooled and condensed, and as shown in FIG. 4, it is sucked up by the capillary action of the wick 10 and becomes droplets 11, which return to the connection and vaporize.

In this way, the superheated vapor refrigerant is sequentially supplied as shown by arrow A, and a large amount of heat is exchanged by latent heat, so the load on the heat source side heat exchanger 3, which acts as a condenser, is reduced, and the high pressure is reduced. As a result, the cooling capacity increases, the input to the compressor 1 decreases, and the operating efficiency increases.

In addition, when the heating operation is performed, the refrigerant in the pipe 7 is in a low-pressure, low-temperature superheated or saturated steam state, and the temperature is lower than the temperature of the condensed water 9 in the water tray 8, but capillary phenomenon occurs near the connection. Since there is no wick 10 that causes , no latent heat transfer occurs.

Therefore, heat transfer is only sensible heat transfer, which is extremely small compared to during cooling operation.

Effects of the Invention As is clear from the above description, the refrigeration cycle of the present invention includes a four-way switching valve, a compressor, a user side heat exchanger, and a heat source side heat exchanger, A branched pipe with a sealed tip is provided in the piping that is sometimes the inlet of the heat source side heat exchanger, and the pipe has a central part between the pipe tip and the connecting part at a position higher than the connecting part and the leading end. A curved path is provided, and a porous material or a fibrous material is provided on the inner circumferential surface of the tube, extending from the tip of the tube beyond the highest point of the curved path and to a higher position than the connecting portion, The tip of the tube is immersed in condensed water from the evaporator, and during cooling operation, the high-pressure, high-temperature superheated vapor refrigerant before entering the condenser is cooled by the condensed water from the evaporator, reducing the high pressure. This increases cooling capacity and reduces compressor input, and during heating operation, there is almost no heat exchange between the low-temperature refrigerant at the evaporator outlet and condensed water, which has the effect of preventing condensed water from freezing. It is.

[Brief explanation of the drawing]

Fig. 1 is a refrigeration cycle diagram showing a conventional example, Fig. 2 is a refrigeration cycle diagram showing another conventional example, Fig. 3 is a refrigeration cycle diagram showing an embodiment of the present invention, and Fig. 4 shows condensed water and heat. FIG. 5 is a sectional view of the piping section to be replaced during cooling, and FIG. 5 is a sectional view of the same piping section during heating. 1...Compressor, 2...Four-way switching valve, 3...Heat source side heat exchanger, 4...Using side heat exchanger, 5...Capillary tube or throttle, 6...Pipe, 6a...Curved section, 8...
...Water saucer, 9...Condensed water, 10...Witsuku.

Claims (1)

[Claims] 1. Connect the four-way switching valve to the compressor discharge pipe, suction pipe, user side heat exchanger, and heat source side heat exchanger, and further connect the other ends of each of the user side and heat source side heat exchangers via a pressure reducing device. A refrigeration cycle capable of switching between air conditioning and heating is constructed by connecting the four-way switching valve to the refrigerant circuit from the end of the four-way switching valve on the heat source side heat exchanger to the heat source side heat exchanger. A curved path section having a curved path at a position higher than the connection section and the tip section is provided between the tube tip and the connection section of the tube, and the highest position section is further provided on the inner circumferential surface of the tube from the tube tip to the connection section. A refrigeration cycle for an air conditioner, in which a porous material or a fibrous material is disposed above and above the connection part, and the tip of the pipe is immersed in condensed water from an evaporator.