JPS643985Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The invention is applicable to air conditioners etc. in which a flat tube having a plurality of refrigerant flow paths is bent in a meandering manner, and corrugated fins are interposed between the parallel parts of the flat tube. It concerns the heat exchanger used.

Structure of the conventional example and its problems In the conventional heat exchanger, as shown in FIGS. 1 and 5, a flat tube 1 having a plurality of refrigerant flow paths is bent in a meandering manner. It has a structure in which corrugated fins 2 are brazed between parallel parts 1a. The refrigerant then enters through the inlet header 3a, passes through a plurality of refrigerant channels in the flat tube 1, and flows out through the outlet header 3b.

Further, air flows from the front to the rear of the flat tube 1 as shown by the arrow in FIG. 1, and heat is exchanged between the refrigerant and the air via the flat tube 1 and the corrugated fins 2.

However, in the conventional configuration described above, since the plurality of refrigerant flow paths in the flat tube 1 are individually independent, the refrigerant that enters one refrigerant flow path cannot mix with the refrigerant flowing through other refrigerant flow paths. , the refrigerant flowing in the refrigerant flow path close to the inlet side A of the passing air is completely heat exchanged, but the refrigerant flowing in the refrigerant flow path close to the outlet side B of the passing air is not sufficiently heat exchanged. The disadvantage was that it was not possible.

Purpose of the invention In view of the above drawbacks, the present invention measures the mixing of the refrigerant flowing through each refrigerant flow path of the flat tube, and allows the refrigerant flowing through the refrigerant flow path of the flat tube portion near the air outlet side to pass through the heat exchanger. The purpose is to improve heat exchange with air and provide a heat exchanger with a large heat exchange capacity.

Structure of the Invention In order to achieve this object, the present invention creates a suitable number of holes in the walls of the plurality of refrigerant passages in the flat tube of the heat exchanger, and inserts inner fins into the holes. The refrigerant flowing in the refrigerant flow path of the flat tube moves to another flow path through the hole drilled in the refrigerant path wall inside the flat tube, and is further mixed by the inner fin inserted into the hole. The refrigerant flowing in the refrigerant flow path near the air inlet side and the refrigerant flowing in the refrigerant flow path near the air outlet side are mixed, and the refrigerant flows in each refrigerant flow path. The temperature of the refrigerant is made uniform, and by making the temperature of the refrigerant uniform, the amount of heat exchange near the air outlet side increases and the heat exchange capacity is improved.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below in Figures 2 to 4.
This will be explained with reference to the figures. Note that the same parts as in the conventional example are denoted by the same reference numerals, and detailed explanation will be omitted.

1 is a flat tube which is bent after extrusion to form a meandering shape. A corrugated fin 2 is interposed between the parallel portions 1a of the flat tube 1, and a refrigerant inlet header 3a and a refrigerant outlet header 3b are attached to both ends of the flat tube 1 and brazed in a furnace. Furthermore, holes 1b are formed in the plurality of refrigerant passage walls of the flat tube 1 at a position 1/3 of the length from the refrigerant inlet side with respect to the total length 1 of the flat tube 1.
, insert the inner fin 4 into the hole 1b from the entrance side, and open the entrances and exits 1b' and 1 of the hole 1b.
b'' is welded to close the entrances and exits 1b' and 1b'' with a closing member 5.

The operation of the evaporator configured as above will be explained below.

Refrigerant enters the plurality of refrigerant flow paths 1c of the flat tube 1 from the inlet header 3a, and the refrigerant flows through each refrigerant flow path through the hole 1b formed in the middle of the flow path as shown in FIG. moves to other refrigerant flow paths,
The inner fins 4 promote mixing and agitation of the refrigerant. As shown in FIG. 2, air in the direction of the arrow enters from the inlet side A in a direction perpendicular to the extrusion direction of the flat tube and passes through the evaporator toward the outlet side B. Heat exchange is performed between this air and the refrigerant via the flat tube 1 and the corrugated fins 2, and the inner fins 4 mix the refrigerant between each refrigerant flow path 1c, and the heat is exchanged with the air passing through the evaporator. Replacement can also be carried out sufficiently near the air outlet side B.

In the embodiment, the hole 1b is bored at a position ⅓ of the total length of the flat tube 1 at a curved portion of the flat tube 1, but the hole 1b does not need to be formed at a curved portion.

Further, although the number of holes is one in the embodiment, it goes without saying that a plurality of holes may be provided.

Effects of the Invention As described above, the present invention bends a flat tube having a plurality of refrigerant passages in a meandering manner, welds corrugate fins between the parallel parts of the bent flat tube, and creates a plurality of refrigerant passages in the flat tube. By drilling a hole in the wall and inserting an inner fin into the hole, sufficient heat exchange between the air passing through the heat exchanger and the refrigerant takes place near the outlet side of the air passing through. This has the effect of greatly increasing abilities.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional heat exchanger, Fig. 2 is a perspective view of a heat exchanger according to one implementation of the present invention, Fig. 3 is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 4 is a FIG. 2 is a developed view of the flat tube in FIG. 2, and FIG. 5 is a sectional view taken along the line - in FIG. 1. 1...Flat tube, 1b...hole, 1b', 1
b″...Entrance/exit of hole 1b, 2...Corrugated fin, 4...Inner fin.

Claims (1)

[Scope of utility model registration request] A flat tube having a plurality of refrigerant passages is bent into a meandering shape, corrugated fins are welded between the parallel parts of the bent flat tube, and holes are drilled at the same positions in the walls of the plurality of refrigerant passages of the flat tube. A heat exchanger with an inner fin inserted into the hole at right angles to the extrusion direction of the flat tube.