JPH0624676Y2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heat exchanger used in a vehicle cooling device and mounted in a vehicle.

(Prior Art) In this type of heat exchanger, for example, Japanese Utility Model Laid-Open No. 51-163
Japanese Patent No. 138 discloses a heat exchanger having a structure in which the heat dissipation surface of a flat tube arranged in a meandering manner is arranged in parallel to the air flow. In this heat exchanger, a refrigerant outward path and a refrigerant return path extending in parallel to each other are formed in the flat tube so as to face each other, and the inlet header and the outlet header are connected to one end of the flat tube. Has become.

Further, in Japanese Utility Model Laid-Open No. 62-75374, in a similar flat tube, the ends of each passage are bent in directions opposite to each other, and an inlet header or an outlet header is connected to each end so that the headers overlap each other. There is disclosed a configuration in which they are arranged in parallel so as not to occur.

(Problems to be solved by the invention) However, according to the conventional heat exchanger, the inlet header and the outlet header are connected only by approximately half the size of the flat tube corresponding to the outward path and the return path of the flat tube. Therefore, there is a problem that the strength of the connected portion is relatively weak.

In particular, this type of heat exchanger has a problem that the connecting portion between the flat tube and the header pipe is likely to be subjected to load due to the vibration of the engine and metal fatigue is likely to occur at the connecting portion.

Then, this invention aims at providing the heat exchanger which can connect a header pipe and a flat tube firmly.

(Means for Solving the Problem) A heat exchanger according to the present invention divides an inside into an outward path and a return path through which a refrigerant flows, and a flat tube provided in a meandering manner and an outward path at one end of the flat tube. An inlet header connected to the return tube, an outlet header connected to the return path, and a communication pipe connected to the other end of the flat tube to connect the forward path and the return path, wherein one end of the flat tube Is formed in a stepped shape in which either one of the outward path and the return path is projected, and one end of the flat tube is connected to either one of the inlet header and the outlet header arranged in parallel, and the protruding portion is It is characterized by being connected to the other header after penetrating this.

(Operation) Therefore, the entire flat tube is connected to one header,
Either the forward path portion or the backward path portion is directly penetrated and connected to the other header located behind. As a result, one flat header is fixed to the whole flat tube, so that a firm mutual fixation is obtained, and the flat tube portion fixed to the other header is supported by the adjacent one header. Therefore, a strong connection can be obtained in the other header.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, the heat exchanger 1 according to the present invention includes a flat tube 2 for circulating a refrigerant to exchange heat with the refrigerant.
Is provided.

The flat tubes 2 are bent and formed at a number of points so that the refrigerant meanders and flows, and corrugated fins 3 are interposed between the flat tubes 2.

The flat tube 2 is formed with a forward path 4 and a return path 5 that extend in parallel and circulate the refrigerant, and are bisected so as to flow in the flat tube 2 so as to face each other. In this case, the second
As shown by an arrow A in the drawing, a return path 5 and a forward path 4 are arranged along the air flow direction.

An inlet header 8 and an outlet header 9 are connected to one end 6 of the flat tube 2, and a communication pipe 11 that connects the outward path 4 and the return path 5 is connected to the other end 10.

As shown in FIG. 3, one end 6 of the flat tube 2 is formed in a stepped shape in which the lower return path (protrusion) 14 extends longer than the upper forward path 13.

An inlet header 8 and an outlet header 9 arranged to intersect the flat tube 2 are connected in parallel to one end 6 of the flat tube 2.

The inlet header 8 has a forward path portion 13 connected to the upper side surface thereof and a return path portion 14 penetrating downwardly, in other words, the entire flat tube 2 is connected to the side surface by brazing 15.

The outlet header 9 is arranged in parallel with the inlet header 8 and is connected only to the return path portion 14 extending through the inlet header 8. The return path portion 14 is inserted into the side surface of the outlet header 9 and is connected by brazing 15.

The inlet header 8 and the outlet header 9 are provided at their upper ends with mounting ports 16 and 17 each having a screw formed on the outside so that a refrigerant supply and discharge hose can be connected thereto.

With the above configuration, the refrigerant flowing from the inlet header 8 flows into the outward path 4 located above the flat tube 2 and meanders in the flat tube 2 for heat exchange.

Then, the communication pipe 11 flows from the upper outward path 4 of the flat tube 2 into the lower return path 5, and is discharged from the return path 5 to the outlet header 9 at one end 6. Like this 4
The heat exchange efficiency can be improved by causing the flow path and the return path 5 to face each other.

On the other hand, at the time of manufacture, since the inlet header 8 is connected to the flat tube 2 while intersecting it at a substantially right angle, stable connection can be achieved, and since the entire flat tube is fixed, the fixing area is wide. Can be firmly connected to each other.

Further, the return path portion 14 formed below the flat tube 2 is connected to the outlet header 9 with a half width dimension thereof, but since it is fixed to the inlet header 8 once before the outlet header 9, it is stable. You can get a good connection. In particular, the flat tube 2 and the inlet / outlet headers 8 and 9 can be fixed in a stable state against the influence of vibration from the engine, and metal fatigue at the connecting portion can be prevented.

Further, at one end 6 of the flat tube 2, the lower return path 1
Since it is only cut stepwise so that 4 protrudes,
Processing of the flat tube 2 is relatively easy, and since the flat tube 2 has a simple structure, it can be easily assembled.

(Effect of the Invention) According to the present invention, since the entire flat tube fixes the entire one header, mutual firm fixation can be obtained, and the flat tube portion fixed to the other header is Since it is pierced and supported by the header of No. 1, it is possible to obtain a reliable and strong connection with the other header.

[Brief description of drawings]

FIG. 1 is a plan view of a heat exchanger according to the present invention, FIG. 2 is a side view of the heat exchanger shown in FIG. 1, and FIG. 3 is a partial sectional view of an inlet / outlet portion of the heat exchanger. 4 ... Forward path, 5 ... Return path, 6 ... One end, 8 ... Inlet header, 9 ... Exit header, 13 ... Forward path, 14 ... Return path (protruding part)

Claims (1)

[Scope of utility model registration request] 1. A flat tube provided in a meandering manner by dividing the inside into an outward path and a return path through which a refrigerant flows, an inlet header connected to the outward path at one end of the flat tube, and an outlet connected to the return path. In a heat exchanger including a header and a communication pipe connected to the other end of the flat tube and communicating the forward path and the return path, one end of the flat tube has a staircase in which either the forward path or the return path projects. The flat tube is formed in a shape, and one end of the flat tube is connected to one of an inlet header and an outlet header arranged in parallel, and the protruding portion is connected to the other header after passing through the header. A heat exchanger characterized by the above.