JPS6110140Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved configuration of an absorption refrigerator, and in particular, the cooling performance is improved by supercooling the condensed liquid refrigerant.

Conventionally, this type of absorption refrigerator liquefies liquid refrigerant in a condenser and evaporates it in an evaporator, but the liquid refrigerant from the condenser is evaporated in the evaporator and refrigerant gas flows down into the mixed gas pipe. The system adopts a configuration in which supercooling is performed by exchanging heat with a mixture of inert gases, but the tube connected to the condenser installed in this heat exchange section uses part of the tube leading to the evaporator. Therefore, pipes with uniform diameter were used. Therefore, in order to improve the degree of subcooling of the liquid refrigerant, it is possible to use pipes with a large diameter, but this increases the overall size of the heat exchange section and the amount of refrigerant sealed. There were so many of them that I didn't like it. This tendency was particularly noticeable when the tube was formed using a multi-layered pipe.

This proposal was made in consideration of these points, and the figures will be explained below.

1 is heated with an arbitrary heating source 2 such as gas, oil, or an electric heater. This generator is equipped with a liquid lifting pipe 3 and the like that utilizes a bubble pump action, and is connected to a rectifier 4, a condenser 5, an evaporator 6, an absorber 7, and a liquid receiving tank 8 in this order. The refrigerant is supplied from the condenser 5 to the evaporator 6 through a hollow pipe 9 whose one end is connected to the discharge end of the condenser 5 . This hollow tube 9 is inserted into the evaporator 6 formed into an arbitrary shape such as a meandering shape from near the end where the downcomer pipe 10 communicating with the liquid receiving tank 8 is connected, and the inside of the evaporator 6 is inserted. The other end is opened near the high end. Reference numeral 11 denotes a hydrogen pipe that extends from the absorber 7 and is connected to the vicinity of the high end of the evaporator 6, which supplies hydrogen gas to the hollow pipe 9.
evaporation of the refrigerant discharged from the discharge port.

The hollow pipe 9 is the downcomer pipe 1 which is the rear end of the evaporator 6.
The part located in the heat exchange part 6A formed on the 0 side is the heat exchange part 9A, and its outer diameter is the part located in the cooling part 6B, which is the front end of the remaining part of the evaporator 6, as the discharge part 9.
The diameter is larger than the outer diameter of B, and the heat exchange area with the refrigerant vapor and excess liquid refrigerant flowing from the evaporator 6 to the downcomer pipe 10 in the heat exchanger section 9A is increased,
The interval between the heat exchanger 6A and the inner circumferential surface is narrowed to slow down the refrigerant circulation speed. The hollow tube 9 may be formed to be somewhat flat. In this case, by comparing the flow areas, the heat exchanger section 9A having a larger area is referred to as having a larger diameter than the discharge section 9B having a smaller area for convenience.

Although the embodiment has been described in which the hollow tube 9 is inserted through the evaporator 6 from the rear end, as shown in FIG. The discharge part may be attached by welding 12 to the outer periphery of the cooling part, or the discharge part may be spaced apart from the cooling part 6. Even in such a case, the hollow tube 9
There is no change in the fact that the portion located in the heat exchange section 6A is made larger in diameter than the portion located in the cooling section 6B. Further, a portion of the hollow tube 9 positioned between the condenser 5 and the heat exchanger 9A may be formed as appropriate, even if it has the same diameter as the heat exchanger 9A or a smaller diameter. In the experiment, the diameter of the heat exchanger section 9A was 8 mm, and the diameter of the cooling section 9B was 6 mm, and the desired good results were obtained. In addition, heat exchange part 6A
The size may be determined experimentally at the beginning of the design, or may be appropriately selected on the side near the downcomer pipe 10, and strict dimensional accuracy is not required.

The present invention is configured as described above, and the liquid refrigerant flowing through the hollow tube from the condenser to the evaporator can be supercooled, and the evaporation temperature in the evaporator can be lowered to improve cooling performance. Furthermore, since the diameter of the hollow tube of the heat exchange section is only increased, the increase in size and weight can be minimized.

[Brief explanation of the drawing]

Figure 1 is a schematic piping diagram of the proposed device, Figure 2 is the
FIG. 3 is a sectional view taken along line AA in the figure, FIG. 3 is a sectional view taken along line BB, and FIG. 4 is a sectional view showing a main part of another embodiment. 6... Evaporator, 9A... Heat exchanger section, 9B... Discharge section.

Claims (1)

[Claims for Utility Model Registration] 1. A generator, a rectifier, a condenser, an evaporator, an absorber connected to a liquid receiving tank, etc. are sequentially arranged in communication, and the condenser is connected to the evaporator. A hollow tube leading to the liquid receiving tank of the evaporator is arranged along a heat exchange section formed on the end side connected to the downcomer pipe communicating with the liquid receiving tank, and further this hollow tube is located in the heat exchange section. An absorption refrigerating device characterized in that the heat exchanger has a larger diameter than the discharge part located in the cooling part. 2. The absorption refrigerating device according to claim 1, in which the heat exchanger part and the discharge part of the hollow tube are inserted into the evaporator from the vicinity of the downcomer pipe.