JPS5919876Y2 - Blazing open rack vaporizer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a brazing type open rack type vaporizer which is designed to be miniaturized.

Traditionally, two flat plates are placed opposite each other with a corrugated fin in between,
Both ends of the flow path are closed with spacer bars, and the flat plate, spacer bar, and corrugated fins are integrated by soldering to form a heat exchange section, and a header tank is fixed to both the upper and lower ends of the heat exchange section, and the liquefied refrigerant is There is a brazing type open rack type vaporizer that introduces refrigerant from a lower header tank and sends it out as a gaseous refrigerant from an upper header tank.

This vaporizer has the advantages of a large transfer area, stable flow of heat medium, good heat transfer rate, and low manufacturing cost, but it requires a large installation area because the heat exchange part is large. There were drawbacks.

Therefore, we attempted to downsize the single-layer heat exchange section by changing it to two or three layers, but since the heat medium flows on the surface of the heat exchange section,
The heat transfer coefficient of the central flow path is extremely poor compared to the outer flow paths, resulting in uneven temperature distribution and flow of the gas refrigerant sent from the upper header tank, resulting in a decrease in heat exchange performance and shortened equipment life. It has the disadvantage of causing various inconveniences.

This invention proposes a brazed open rack type vaporizer with the aim of eliminating the above-mentioned drawbacks.As shown in the figure, four flat plates 3 and three corrugated fins 5 are stacked alternately, and the Both ends of the passage are closed with spacer bars 4 to form a three-layer heat exchange section 6, and an upper header tank 2 is fixed to the upper end of the heat exchange section 6, a lower header tank 1 is fixed to the lower end of the heat exchange section 6, and the lower header tank 1 is fixed to the lower end of the heat exchange section 6. A large number of branch pipes 9 for introducing liquefied refrigerant through feed pipes 7 are arranged in parallel on the lower surface of the header tank 1, and a large number of holes 8 are bored in the flat plate 3 sandwiched between the corrugated fins 5 of the heat exchange section 6. It will be set up.

Although the heat exchange section 6 is shown as having three layers, the present invention is not limited thereto, and the holes 8 are formed on the entire surface of the flat plate 3 at equal intervals perpendicular to the flow path. Various other possibilities can be considered.

Moreover, 10 is a pipe for sending out a gaseous refrigerant. In the vaporizer, for example, seawater is sprinkled from a heat medium water distribution pipe (not shown), and the seawater falls in a film along the heat exchanger 6, and then the liquefied refrigerant is introduced from the feed pipe 7 through the branch pipe 9. It is introduced into the lower header tank 1.

At this time, even if a pressure fluctuation occurs in the liquefied refrigerant in the feed pipe 7, it does not pose much of a problem because the resistance to flowing into the lower header tank 1 through the branch pipe 9 is increased.

The liquefied refrigerant that has entered the lower header tank 1 equally flows into each flow path of the heat exchange section 6, is given heat by the seawater flowing on the outer surface of the heat exchange section 6, and is vaporized as it rises.

At this time, the liquefied refrigerant in the central flow path mixes with the liquefied refrigerant in the outer flow paths as it rises through the holes 8 of the flat plate 3, and heat is transferred, so that each flow path is uniformly vaporized. However, the gas becomes a complete gas at the upper end of the heat exchange section 6, and is sent out through the upper header tank 2 and the delivery pipe 10 to the outside.

According to this invention, as mentioned above, the heat exchange part of the vaporizer is made multi-layered and miniaturized without reducing the heat exchange performance of the vaporizer, so the installation area of the vaporizer can be reduced and manufacturing is easy. becomes.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the brazed open rack type vaporizer of this invention. In the diagram: 1...lower header tank, 2...
...Upper header tank, 3...Flat plate, 4...
... Spacer bar 5 ... Waveform fin, 6
...Heat exchange section, 7...Feed pipe, 8...
... hole, 9 ... branch pipe, 10 ... delivery pipe.

Claims (1)

[Scope of utility model registration request] In a vaporizer, header tanks are fixed to both the upper and lower ends of the heat exchange section, liquefied refrigerant is introduced from the lower header tank, and gaseous refrigerant is sent out from the upper header tank. Both ends are closed with spacer bars to form a heat exchange section, an upper header tank is fixed to the upper end of the heat exchange section, a lower header tank is fixed to the lower end of the heat exchange section, and liquefaction is carried out from the feed pipe to the bottom of the lower header tank. A brazed open rack type vaporizer characterized in that a large number of branch pipes for introducing a refrigerant are arranged in parallel, and a large number of holes are bored in a flat plate sandwiched between corrugated fins of the heat exchange section.