JPH025330Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a condensed water discharge device in an evaporator of a cooler such as a car cooler.

Generally, an evaporator for a car cooler has a meandering flat tube with a refrigerant passage, and corrugated fins are interposed between each straight pipe part, and forced air is used to flow the air perpendicularly to the refrigerant passage. ing.

When the evaporator is operated, moisture in the air near the evaporator is cooled, causing dew condensation on the outer surface of the evaporator. The water that has condensed on the outer surface of the flat tube flows down to the upper surface of the corrugated fin, and the water that has condensed on the upper surface of the corrugated fin, together with the flowing water, flows down to the leeward edge of the flat tube as a result of forced air flow. The wind blows close to both sides. Condensed water is particularly likely to form on the leeward side, and all of the condensed water is blown toward the leeward side by forced airflow, so that the condensed water is concentrated on the leeward edge of the evaporator.
However, in conventional evaporators, the leeward edge of the flat tube has a horizontal cross section of approximately circular arc shape, and the leeward edge of the corrugated fin is further away from the leeward edge of the flat tube.・There was a drawback that the water droplets that collected on the leeward edge of the fin could not migrate to the flat tube side, and therefore it was difficult to discharge the water droplets to the lower part of the evaporator.

This invention aims to eliminate the above-mentioned drawbacks, and its configuration will be explained below based on the embodiments shown in the drawings.

In the drawing, the evaporator has a corrugated tube between each straight pipe section 2a of a meandering flat tube 2 having a refrigerant passage 1.
Fins 3 are interposed, and the wind A is forced to flow perpendicularly to the refrigerant passage 1.

The flat tube 2 is made of extruded aluminum, and a large number of refrigerant passages 1 are provided in parallel therein. The corrugated fin 3 is made of a thin aluminum plate, is soldered to the flat tube 2, and is provided with a large number of louvers 7.

The leeward edge 2b of the flat tube 2 is provided with an overhanging edge 4 that projects further in the ventilation direction than the leeward edge 3a of the corrugated fin 3, and on both sides of the overhanging edge 4,
Projections 5 having a height equal to or slightly exceeding the thickness of the corrugated fins 3 are provided to protrude toward the fins 3, and these projections 5
and the flat tube contact portion 6 of the leeward edge 3a of the corrugated fin are joined.

Here, as shown in FIG. 3, it is desirable that the amount of protrusion d of the overhanging edge 4 provided on the leeward edge 2b of the flat tube 2 is as small as possible. In other words, generally speaking, evaporators such as car cooler evaporators have a narrow and limited space in the car to install them, so they must be designed and manufactured to the minimum dimensions to eliminate waste. It is desirable that the amount of protrusion d of the overhanging edge 4 is as small as possible. Incidentally, a groove 8 is provided on the outer surface of the overhanging edge 4 in the length direction in order to reduce the amount of material used.

Also, the height of the protrusions 5 provided on both sides of the overhanging edge 4, that is, the amount of protrusion l of the protrusions 5 toward the fin 3 side.
is equal to or slightly larger than the thickness of the corrugated fin 3.

Wind A generated by the blower is blown in the direction of the arrow in FIGS. 1 to 3. This wind A
Due to surface tension, the condensed water blown onto the leeward edge 3a of the corrugated fin 3 moves from the flat tube contact portion 6 of the fin leeward edge 3a to the protrusion 5, and then from the protrusion 5 to the flat tube. It flows down along the overhanging edge 4 of 2. Here, if the height l of the protrusion 5 is larger than the thickness of the fin 3, the air flow path at the leeward edge of the evaporator is narrowed by the protrusion 5, so that the air flow is A portion of the static pressure is changed to dynamic pressure, and the condensed water is pushed away by the airflow, allowing it to be drained more smoothly. On the other hand, the condensed water blown onto both sides of the leeward edge 2b of the flat tube 2 is transferred to the overhanging edge 2b.
It flows down along the evaporator and is discharged below the evaporator.

According to this invention, the leeward edge 2b of the flat tube 2
An overhanging edge 4 that protrudes in the ventilation direction from the leeward edge 3a of the corrugated fin 3 is provided, and on both sides of this overhanging edge 4, a height equal to or slightly exceeding the thickness of the corrugated fin 3 is provided. This is because the protrusions 5 having a height are provided so as to protrude toward the fin 3 side, and these protrusions 5 are joined to the flat pipe contact portion 6 of the leeward edge 3a of the corrugated fin. The condensed water blown to the leeward edge 3a of the corrugated fin 3 by forced air transfers to the protrusion 5 from the flat tube contact portion 6 of the fin leeward edge 3a due to surface tension, and further moves to the protrusion 5. This has the effect of flowing down along the overhanging edge 4 of the flat tube 2 and being discharged extremely smoothly below the evaporator.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a side view, FIG. 2 is an enlarged sectional view taken along the line of FIG. 1, and FIG. 3 is an enlarged sectional view taken along the line of FIG. 2. . DESCRIPTION OF SYMBOLS 1... Refrigerant passage, 2... Flat tube, 2a... Straight pipe part, 2b... Leeward side edge, 3... Corrugated fin, 3a... Leeward side edge, 4... Overhanging edge, 5 …
...Protrusion, 6...Flat tube contact part.

Claims (1)

[Scope of utility model registration request] In an evaporator in which a corrugated fin 3 is interposed between each straight pipe part 2a of a meandering flat tube 2 having a refrigerant passage 1, and in which wind A is forced to flow perpendicularly to the refrigerant passage 1, the flat tube 2 The leeward edge 2b of the corrugated fin 3 is provided with an overhanging edge 4 that protrudes further in the ventilation direction than the leeward edge 3a of the corrugated fin 3. Protrusions 5 having a height of at least or slightly exceeding this height are provided in a state protruding toward the fin 3 side, and these protrusions 5 and the flat tube contact portion 6 of the leeward edge 3a of the corrugated fin are joined. Condensation water drainage device.