JP3473173B2 - Heat exchanger for vehicles - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube through which a heat exchange fluid flows, such as a refrigerant condenser (condenser) used in an air conditioning system for vehicles, and a heat exchange tube which is brazed to the heat exchange tube. The present invention relates to a heat exchanger for a vehicle, which includes a heat exchange fin that promotes heat exchange between a fluid and air that flows outside a heat exchange tube, and particularly, in a refrigerant condenser that includes a corrugated fin for heat exchange . , to means for preventing the falling off peeled from brazed corrugated fins apt cube in the tube through which the refrigerant flows.

[0002]

2. Description of the Related Art A heat exchanger such as a refrigerant condenser used in an air conditioner for a vehicle such as an automobile is attached to a radiator for cooling an internal combustion engine or the like at a position where a running wind is likely to be received at the front of the vehicle. In many cases, in such heat exchangers, for example, in a corrugated refrigerant condenser, a tube is generally used so as not to leak the refrigerant that is enclosed in the refrigeration cycle and flows in the flat heat exchange tube. As the core material, a material that is relatively resistant to corrosion is used, and the corrugated fins that do not come into direct contact with the refrigerant and the flat tube surface where the brazing is done corrode earlier than the tube core material. Care has been taken to prevent corrosion of the tube core material and leakage of the refrigerant by using a material that is easily eroded. Therefore, for example, when the corrugated refrigerant condenser is used in an environment where it is easy to get wet with seawater or icing easily, corrugated fins,
There is a problem that corrosion easily occurs in the brazed part that attaches it to the tube.

When a vehicle runs on a submerged road, the lower part of the refrigerant condenser is flooded and receives water resistance. At that time, the wax of the corrugated fins of the refrigerant condenser is in contact. If the attached part is corroded and the fin is partially peeled off from the tube, the fin will easily drop off due to water resistance, or even if it does not drop, there will be a gap between the tube and the fin. Once done,
Due to the vibration of the engine or the vibration of the vehicle body caused by the unevenness of the road surface during traveling, the fins vibrate repeatedly contact the tube, which causes abnormal noise, and part of the tube is corroded and pierced due to wear. In some cases, problems such as refrigerant leakage may occur.

Incidentally, Japanese Utility Model Publication No. 62-142680,
Japanese Utility Model Publication No. 62-142682 or Japanese Utility Model Publication No. 62-62
In Japanese Patent Laid-Open No. 1920989, in a corrugated heat exchanger using a meandering flat tube, a sandwiching member made of a synthetic resin is used to hold the left and right bent portions of the tube so that each tube bends. Although it is shown that the parts are arranged in a straight line so that they do not shift from each other, what is held by these holding members is the left and right bent parts of the meandering tube, which are folded back and supported in parallel with each other. Since it does not hold the corrugated fins brazed so as to connect between the adjacent tubes, even in these heat exchangers shown in the prior art,
Similar to the one described above, the problem of peeling of the tube from the corrugated fin and the falling of the fin may occur.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention addresses the above-mentioned problems in the prior art and effectively removes or drops tubes and fins in a vehicle heat exchanger by a very simple means. It aims to prevent and eliminate those problems.

[0006]

Means for Solving the Problems The present invention is, as a means for solving the above problems, a heat exchange tube which is supported in parallel for flowing a heat exchange fluid therein, and a heat exchange tube of the heat exchange tube. Corrugated fins brazed to the heat exchange tube to aid in heat exchange between the heat exchange fluid flowing inside and the air flowing outside the heat exchange tube, and the corrugated fin peels from the heat exchange tube. A drop-out preventing means provided to prevent the drop-out due to the heat exchanging tube and the corrugated fins. Provided is a heat exchanger for a vehicle, which comprises a U-shaped clamp.

[0007]

According to the present invention, the heat exchange tube and the heat exchange corrugated fin to be brazed thereto are inserted into the space formed by the heat exchange tube and the corrugated fin in addition to the brazing. U with multiple engaging protrusions
The corrugated fins are not easily separated from the heat exchange tube because they are fixed by the disengagement prevention means composed of a V-shaped clamp, and even if they are separated, the fins are reliably prevented from falling out of the tube.

[0008]

1 to 4 show a first embodiment in the case where the present invention is applied to a corrugated refrigerant condenser used in a vehicle air conditioner. As is clear from FIG. 2, the corrugated refrigerant condenser 1 has a tank (header) extending in the left-right direction.
2 and 3 are provided, and a large number of flat heat exchange tubes 4 are attached by brazing so as to connect them in parallel and communicate with each other. The tube 4 is manufactured by extrusion molding of an aluminum alloy, for example. The cross section of each tube 4 is divided into several parts by some partition walls, whereby several relatively thin channels are formed in the direction in which the refrigerant flows. A corrugated fin 5 formed by corrugating a thin plate of aluminum alloy with a predetermined width in advance is inserted between the adjacent tubes 4, and is fixed to the tube 4 by brazing. An air flow path is formed in a direction perpendicular to the surface of the condenser 1.

The left tank 2 is provided with an inlet port 6 serving as a refrigerant inlet and an outlet port 7 serving as an outlet. Although not shown, since a partition wall is provided in the middle stage of the tank 2 for partitioning the portion on the inlet port 6 side and the portion on the outlet port 7 side, a gas refrigerant flowing into the tank 2 from the inlet port 6 is provided. Is prevented from flowing directly to the outlet port 7 and is diverted to approximately the upper half of the group of flat heat exchange tubes 4 and flows toward the upper part of the tank 3 on the right side to join in the tank 3. , It splits again in the tank 3, passes through the group of tubes 4 in the lower half, and flows toward the lower part of the left tank 2. And the refrigerant is thus tube 4
While reciprocating through the group of, heat is exchanged with the air flowing so as to come into contact with the fins 5 and the tubes 4, and condensed to become a liquid refrigerant, which is discharged from the outlet port 7 to the outside. It is like this.

The above-described structure of the refrigerant condenser 1 is not different from the conventional one, but the feature of the present invention is that in the heat exchanger such as the refrigerant condenser for the vehicle air conditioner, the heat like the refrigerant is used. Even if the corrugated fins 5, which are heat exchange fins brazed to the tubes 4 through which the exchange fluid flows, are separated from the tubes 4, the corrugated fins 5 are condensed by the refrigerant so that the corrugated fins 5 do not drop out of the refrigerant condenser 1. The fall prevention means for fixing to the vessel 1 is provided, and as the fall prevention means of the first embodiment, a synthetic resin U for restraining the corrugated fins 5 across the front and rear surfaces of the lower portion of the corrugated refrigerant condenser 1 is used. It is characterized in that the character-shaped clamp 8 is attached.

The clamp 8 which is a means for preventing the corrugated fins 5 from coming off in the refrigerant condenser 1 of the first embodiment is shown in FIG.
And as shown in FIG. 2, synthetic resin strips 9, 10,
Have 11. The strip-shaped portions 9, 10, 11 are a series, each of which is a substantially flat plate, but the boundary between them is thin as shown in FIG. 3 to form the hinge portion 12 which is easily bent. ing. Then, the strip-shaped portion 9 contacts the front surface of the refrigerant condenser 1, the strip-shaped portion 10 contacts the bottom surface of the refrigerant condenser 1, and the strip-shaped portion 11 contacts the rear surface of the refrigerant condenser 1.

Engaging projections 13 and 14 as shown in FIG. 1 are integrally formed on the front strip 9 and the rear strip 11 of the clamp 8. Engaging projections 13 and 14
Has a conical point at each tip, and the body has a cylindrical shape, and has a circular groove or spiral grooves 13a and 14a around them as shown in FIG. The ridges 13b and 14b between them are provided in several steps or more and have a screw nail shape. Needless to say, the shape of the body of the engaging projections 13 and 14 is not limited to the cylindrical shape, and may be any shape close to it.

The clamp 8 is bent at a right angle at the hinge portion 12, and is abutted so that the whole of the corrugated refrigerant condenser 1 has a U shape from the front surface to the bottom surface to the rear surface. Engaging projections 13 and 1
4 are inserted into one of the gaps formed between the corrugated fins 5 shaped like a corrugated plate and the flat heat exchange tubes 4 from the front and the rear of the refrigerant condenser 1. As shown in FIG. 4, when a large number of cut-and-raised parts 15 are formed in the corrugated fin 5 in advance, the protrusions 13 of the engaging projections 13 and 14 are formed.
b and 14b engage with the cut-and-raised portion 15 of the corrugated fin 5, so that the engagement protrusions 13 and 14 cannot come off between the corrugated fin 5 and the flat heat exchange tube 4. As a result, the U-shaped clamp 8 is securely fixed to the front and rear surfaces of the corrugated refrigerant condenser 1. In this way, the cut-and-raised parts 15 of the corrugated fins 5 have the engagement protrusions 13 and 1
Not only does it serve as a reliable stopper for the No. 4 but also promotes the heat exchange between the air and the corrugated fins 5, and thus with the refrigerant.

If, for example, three such clamps 8 are arranged at equal intervals in the width direction of the refrigerant condenser 1, the intervals between the adjacent clamps 8 or the intervals between the clamps 8 and the tanks 2 and 3 on the left and right will be described. Are about 10 cm each, so the corrugated fins 5 located relatively below the refrigerant condenser 1 are
Even if the brazed portion of the flat heat exchange tube 4 peels off for some reason, the peeled corrugated fins 5 are restrained by the strip-shaped portion 11 on the rear surface of the clamp 8 or the strip-shaped portion 9 on the front surface, so that the vehicle is submerged. Even if the corrugated fins 5 travel on a running road surface, the corrugated fins 5 are prevented from falling out of the tubes 4 due to the resistance of water. However, when peeling of the corrugated fins 5 has not occurred, the U-shaped clamp 8 functions to prevent peeling. Further, since the clamp 8 is made of synthetic resin which is softer than metal, it also has an effect of suppressing the vibration of the fins 5 peeled from the tube 4, and the generation of noise due to the vibration of the peeled fins 5 is prevented. .

[0015]

[0016]

[0017]

[0018]

[0019]

According to the present invention, by extremely simple means, it is possible to effectively separate or drop tubes and fins in a heat exchanger for a vehicle such as a corrugated refrigerant condenser for a vehicle air conditioner. As a result, noise due to vibration of the separated fins and leakage of heat exchange fluid due to perforation of the tube can be prevented, and the problems of the prior art can be solved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fall-out prevention unit according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a refrigerant condenser to which the drop-off preventing means of the first embodiment is attached.

FIG. 3 is a side view showing an enlarged part of the first embodiment.

FIG. 4 is an enlarged sectional view showing another part of the first embodiment.

[Explanation of symbols]

1. Corrugated refrigerant condenser 2, 3 ... Tank (header) 4 ... Flat heat exchange tube 5 ... Corrugated fin 6 ... Entrance port 7 ... Exit port 8 ... U-shaped clamp (first embodiment) 9, 10, 11 ... Strip 12 ... Hinge part 13, 14 ... Engaging projections 15 ... Cutting and raising fins

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-52498 (JP, A) Actual flat 7-2782 (JP, U) Actual flat 6-40681 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B60H 1/00-3/06 F28F 1/30

Claims (3)

(57) [Claims] 1. A heat exchange tube supported in parallel for flowing a heat exchange fluid therein, and a heat exchange fluid flowing inside the heat exchange tube and air flowing outside the heat exchange tube. A corrugated fin that is brazed to the heat exchange tube to help heat exchange of the corrugated fin, and a drop-out prevention unit that is provided to prevent the corrugated fin from peeling off from the heat exchange tube and falling off. The heat exchanger for a vehicle, wherein the drop-out preventing means comprises a U-shaped clamp having a plurality of engaging protrusions inserted into a space formed by the heat exchange tube and the corrugated fins. 2. The engagement protrusion is a protrusion for preventing slipping out.
The heat exchanger for a vehicle according to claim 1, further comprising a groove . 3. The corrugated fins are the engagement protrusions.
The heat exchanger for a vehicle according to claim 2, further comprising a cut-and-raised part that can be engaged with the ridge .