JPS6339825B2 - - 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 configuration and its problems Conventionally, in a reversible cooling/heating refrigeration cycle that includes a four-way switching valve, in order to effectively utilize the cold energy of condensed water during cooling, as shown in Figure 1, a compressor a, a four-way switching valve b, and heat source side heat are used. Exchanger c, user 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 stored in a water receiver h. It exchanges heat. It is known that this heat exchange action increases the cooling capacity during cooling 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. Note that in FIG. 2, parts having the same functions as those in FIG.

OBJECT OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks.
The purpose is to improve the performance during cooling operation and to prevent damage to the outdoor fan 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 the refrigerant piping leading to the heat source side heat exchanger, and inclines the tube so that the tip faces upward. , 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. 6 is a pipe whose one end is sealed and the other end is branched and connected to the piping 7 between the heat source side heat exchanger 3 and the four-way switching valve 2, and the pipes are located at successively higher positions from the connection part toward the pipe tip. It extends at an angle. Further, the tip of the tube 6 is immersed in condensed water 9 stored in a water tray 8. This water tray 8 is provided below the user side heat exchanger 3 and receives condensed water from the heat source side heat exchanger 3.

In the above configuration, when the cooling operation is started, the refrigerant in the pipe 7 turns into high-temperature, high-pressure superheated steam, while the condensed water 9 that is condensed in the heat exchanger 4 on the user side and stored in the water tray 8 flows inside the pipe 7. The superheated vapor refrigerant is cooled and condensed, becomes droplets 10 as shown in FIG. 4, returns to the connection part by gravity as the pipe 6 tilts, and vaporizes.

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 lowered. 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. No heat transfer takes place.

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, At times, a pipe with a sealed end is provided in the pipe that serves as the inlet of the heat source side heat exchanger as a branch, and the pipe is arranged in an inclined manner so as to have a sequentially higher position from the connecting part toward the pipe tip, 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. As a result, cooling capacity is increased and compressor input is reduced, and during heating operation, there is almost no heat exchange between the low-temperature refrigerant at the evaporator outlet and the condensed water, and freezing of the condensed water can be prevented. Furthermore, since the condensed refrigerant moves due to the inclination of the tube, there is no need to provide a porous or fibrous material that causes capillarity on the inner surface of the tube for the purpose of promoting latent heat transfer, so the structure is simple and inexpensive. It has various advantages, such as being able to be manufactured easily.

[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 is a diagram showing condensed water and heat. Cross-sectional view of the piping section to be replaced during cooling,
FIG. 5 is a sectional view of the 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, 6...Pipe, 8...Water tray, 9... Condensed water.

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 heat exchanger on the user-side heat source side to each other via a pressure reducing device. Connect this to form a refrigeration cycle that can switch between cooling and heating, and connect a tube with a sealed tip 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 refrigeration cycle for an air conditioner, in which the tubes are arranged at positions higher than the connecting portion toward the tip of the tube, and the tip of the tube is further immersed in condensed water from an evaporator.