JPH0749249Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a heat exchanger used for an air conditioner for an automobile.

[Conventional technology]

 FIG. 2 shows an external perspective view of a conventional heat exchanger.

Reference numeral 1 denotes one of the refrigerant pipes stacked to form the heat exchanger. Reference numeral 10 is a corrugated fin that is mounted in contact with a plurality of refrigerant tubes arranged in parallel.

FIG. 3 shows an exploded perspective view of a part of the heat exchanger. 11
A and 11B are flat tube constituent members, and one flat tube 11 is formed by combining them. Since the flat tube constituent members 11A and 11B are provided with the partition portion 13 at the center, they are divided into the refrigerant descending flow passage 14A and the refrigerant ascending flow passage 14B when they are united. 12A and 12B are inner fins fitted into the respective flow paths 14A and 14B formed by partitioning as described above, and each of the descending and ascending flow paths 14A and 14B of the refrigerant is further provided with a plurality of small internal parts. Divided into flow paths. By assembling the flat tube constituent members 11A, 11B and the inner fins 12A, 12B, one flat refrigerant pipe 1 is formed.
Reference numeral 10 is a corrugated fin arranged between adjacent refrigerant pipes.

FIG. 4 is a sectional view of the refrigerant pipe 1. 11 is a flat tube,
12A and 12B are refrigerant descending flow paths 1 partitioned by a partition section 13.
Inner fins 2 fitted in 4A and the refrigerant ascending flow path 14B are folded portions of the flow path provided in the lower portion of the flat tube 11. Reference numeral 4 is a guide provided in the folded-back portion 2 for guiding the flow of the refrigerant. The header is provided on the upper portion of the flat tube 11 and is partitioned by the partition portion 13, one of which serves as a refrigerant inlet header 5 and the other of which serves as a refrigerant outlet header 6. 8A is the flow of air on the inflow side, 8B is the flow of air on the outflow side, 9A is the flow of the refrigerant in the refrigerant descending flow path,
9B is the flow of the refrigerant in the folded portion, and 9C is the flow of the refrigerant in the refrigerant ascending flow path.

In the above-mentioned apparatus, the refrigerant is the refrigerant tube 1 in the gas-liquid two-phase state.
Flowing in from the refrigerant inlet header 5 in the upper part of the, while evaporating midway, descending in the refrigerant descending flow path 14A along the arrow 9A,
After being mixed while flowing along the arrow 9B in the lower turnaround portion 2, it rises along the arrow 9C in the refrigerant ascending passage 14B and flows to the upper refrigerant outlet header 6 where it is mixed again. , Flows out from the heat exchanger.

[Problems to be solved by the device]

When the flow velocity of the refrigerant is slow, as shown in FIG. 4, at the turnaround portion, the gas-liquid two-phase refrigerant that has flowed through each of the small channels in the refrigerant descending channel 14A is separated into the gas and the liquid 7. I will end up. Therefore,
In the refrigerant ascending flow passage 14B after the turn-back portion 2 in which the liquid refrigerant 7 is pulled up by the gas flow velocity and rises, less gas enters the small flow passage near the outer edge of the air inflow side where the heat load is largest,
The liquid refrigerant 7 also stops flowing. As a result, the distribution of the heat load in each small flow path in the refrigerant ascending flow path becomes uneven, and the heat transfer efficiency of the heat transfer tube also deteriorates.

In the present invention, the flow rate of the refrigerant in each of the small flow paths in the refrigerant ascending flow path 14B is equalized, the deviation of the heat load is eliminated, and the heat transfer efficiency of the heat exchanger is improved.

[Means for Solving the Problems]

The present invention has solved the above-mentioned problems and has a refrigerant descending flow path and a refrigerant ascending flow path that are separated by a central partition, and each of the flow paths has a plurality of small flow paths therein. A heat exchanger configured by stacking flat refrigerant pipes each having a folded portion that folds back the flow of the refrigerant from the refrigerant descending passage to the refrigerant ascending passage in the lower portion, At a small flow path near the outer edge of the air outflow side to a small flow path near the outer edge of the air inflow side in the refrigerant upflow path, and a small distance away from the outer edge of the air outflow side in the refrigerant downflow path. In order to allow the refrigerant that has descended the flow path to flow into the small flow path away from the outer edge of the air inflow side in the refrigerant rising flow path,
The present invention relates to a heat exchanger characterized in that the turn-back portion is provided with a continuous guide for partitioning the turn-back portion into a plurality of independent flow paths.

[Action]

The continuous guide provided in the present invention forces the refrigerant to flow in a mixed state of gas and liquid, and the refrigerant that descends the small flow path with a small heat load raises the small flow path with a large heat load, The refrigerant that has descended from the small flow path with a large load raises the small flow path with a small heat load, so that the refrigerant flows evenly through each small flow path in the refrigerant ascending flow path, and deviation of the heat load is prevented.

〔Example〕

FIG. 1 shows a sectional view of a refrigerant pipe 1'in one embodiment of the present invention. In the figure, 4'is a continuous guide provided in the folded portion 2 of the flow passage, and the flow passage of the folded portion is AA ', B
-B ', C-C' are divided into three independent flow paths. The part shown in this figure is used in place of the conventional refrigerant pipe 1 shown in FIG. 4, and the structure and operation of the parts other than the above are the same as those of the corresponding parts in FIG. The description is omitted.

In the above device, since the flow path is partitioned by the continuous guide 4 ', there is no mixing at the folded portion as in the conventional case, and therefore, the gas and the liquid are not largely separated from each other. The refrigerant separated into gas and liquid in the flow path is guided to the refrigerant ascending flow path while remaining in a mixed state, and the liquid refrigerant can be pulled up by the gas flow velocity to ascend. The refrigerant can be evenly sent to each of the small flow paths.

In addition, before reaching the turnaround portion 2, the refrigerant that has descended a small flow path having a small heat load near the outer edge on the air outflow side in the refrigerant descending flow path and reached the inlet A of the turnaround portion rises in the latter half. In the flow path, it is guided to the outlet A'of the folded portion so as to be connected to the small flow path near the outer edge on the air inflow side and having a large heat load. On the contrary, before reaching the turnaround portion 2, the refrigerant that has flowed through the small flow path having a large heat load and that has reached the inlet C of the turnaround portion in the refrigerant descending flow path is separated from the outer edge on the air outlet side in the latter half. In the refrigerant ascending passage, the refrigerant is guided to the outlet C'of the folded portion so as to be connected to a small passage having a small heat load, which is separated from the outer edge on the air inflow side. As a result, the deviation of the heat load is reduced in the refrigerant ascending flow path.

As described above in detail, in the present embodiment, the continuous guide is provided at the folded portion of the refrigerant flow path to equalize the flow rate of the refrigerant liquid and reduce the deviation of the heat load. Heat transfer efficiency is improved.

[Effect of device]

In the present invention, a continuous guide is provided at the folded portion of the flow path so that the small flow path near the outer edge of the refrigerant descending flow path on the air outflow side is moved to the small flow path near the outer edge of the refrigerant upflow path on the air inflow side. By forming an independent flow path that connects a small flow path away from the outer edge of the refrigerant descending flow path on the air outflow side to a small flow path away from the outer edge of the refrigerant upflow path on the air inflow side, Since the flow rate of the refrigerant in each small flow path is equalized and the deviation of the heat load is eliminated, the heat transfer efficiency of the heat exchanger can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a refrigerant pipe according to an embodiment of the present invention, and FIG.
FIG. 3 is an external perspective view of a conventional heat exchanger, FIG. 3 is an exploded perspective view of a part of the conventional heat exchanger, and FIG. 4 is a sectional view of a refrigerant pipe of the conventional heat exchanger. 1,1 '... Refrigerant pipe, 2 ... Folding part, 4 ... Guide,
4 '... Continuous guide, 5 ... Refrigerant inlet header, 6 ...
Refrigerant outlet header, 7 ... Liquid refrigerant, 8A, 8B ... Air flow, 9A, 9B, 9C ... Refrigerant flow, 10 ... Corrugated fin, 11 ... Flat tube, 11A, 11B ... Flat tube configuration Member, 12A, 12B ... Inner fin, 13 ... Partition, 14A ... Refrigerant descending passage, 14B ... Refrigerant ascending passage

Claims (1)

[Scope of utility model registration request] 1. A refrigerant descending flow path and a refrigerant ascending flow path divided by a central partition, each of the flow paths having a plurality of small flow paths therein, and the refrigerant at the bottom thereof. In a heat exchanger configured by stacking flat refrigerant pipes each having a folded portion that folds the flow of the refrigerant from the descending flow path to the refrigerant ascending flow path, in the refrigerant descending flow path, close to the outer edge on the air outflow side. The refrigerant descending the small flow path to the small flow path near the outer edge of the air inflow side in the refrigerant upflow path, and the refrigerant descending the small flow path apart from the outer edge of the air outflow side in the refrigerant downflow path A heat exchanger characterized in that a continuous guide for partitioning the folded-back portion into a plurality of independent flow passages is provided in the folded-back portion so that the refrigerant can flow into a small flow passage separated from the outer edge of the air inflow side in the refrigerant rising flow passage. .