JPH07117348B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a heat exchanger and can be used as, for example, a heater or a radiator for an automobile.

[Conventional technology]

Conventionally, tubes used in heat exchangers have been devised in various ways to improve their heat exchange efficiency.

FIG. 9 shows a conventional tube. For example, in the case shown in FIG. 9 (a), a wire 6 bent zigzag in a tube 601 having a flat cross section.
02 is arranged. By arranging the wire 602, the fluid flowing in the tube 601 is agitated.

Alternatively, as shown in FIG. 9 (b), the tube 601
A plurality of ribs 603 extending in the width direction of the tube are projected inward of the tube. This rib 603 also causes the fluid flowing in the tube 601 to be agitated.

Alternatively, as shown in FIG. 9 (a), there is a tube 601 having a plurality of dimples 604 protruding from the outside to the inside.

A corrugated fin having a corrugated shape is joined to the flat side surface of such a flat tube 601. Regular tube to improve the connection with corrugated fins
The flat surface of 601 is shaped like an arc toward the outside, and when the fins are assembled, the flat surface of the tube that is shaped like the bow is elastically deformed inward, which causes the fin and the tube to move. The joining state with 601 is improved.

[Problems to be solved by the invention]

Thus, in order to make the flat side surface of the tube into an arcuate shape outward (hereinafter referred to as a medium convex shape), when molding the tube 601 as a general method, the cross section inside the tube 601 is The most common method is to insert a barrel-shaped core metal and form a tube along the core metal.

However, as shown in FIG. 9, in the case where the wire 602, or the rib 603 and the dimple 604 are arranged and formed over the entire width direction of the tube, when the core metal is arranged, the rib 603 and the like form the core metal. Tube 6 good to get in the way
There is a problem that 01 cannot be molded into a medium convex shape.

[Means for solving problems]

In view of the above problems, it is an object of the present invention to obtain a heat exchanger including a tube having dimples or ribs, which tube is preferably formed into a medium convex shape.

In order to achieve this object, in the present invention, a plurality of projections protruding toward the inside of the tube are formed on the flat side surface of the tube, and these projections are formed on one flat side surface of the tube from the center line in the width direction of the tube. Was arranged only on the edge side, and on the other flat side surface, it was arranged only on the other edge side from the center line in the width direction of the tube.

[Action / effect]

Therefore, since the projections formed on both flat side surfaces of the tube do not face each other, the thickness of the cored bar to be inserted into the tube at the time of forming the tube can be made sufficiently thick, and the tube can be laid along the cored bar in a good condition. It can be molded into a medium convex shape.

〔Example〕

FIG. 5 is a perspective view when the present invention is used as a heater for an automobile.

Plural flat tubes 102 through which warm water passes are arranged side by side, and corrugated fins 103 bent in a wave shape are joined between the flat tubes 102. An inlet tank 104 is provided at one end of the flat tube 102.
And the outlet tank 105 is joined. An intermediate tank 106 is joined to the other end of the flat tube 102.

An inlet pipe 107 for guiding cooling water into the inlet tank 104 is joined to the inlet tank 104, and an outlet pipe 108 for leading out cooling water in the outlet tank 105 is joined to the outlet tank 105. Has been.

FIG. 6 is a partial cross-sectional perspective view showing the connection structure between the flat tube 102 and the tanks 104 and 105 of the heater 101 shown in FIG. As can be seen from this figure, a plurality of flat tubes 102 arranged in parallel are inserted and fixed in burring holes 109a formed in an end plate 109 at one end thereof. The outer peripheral edge 109b of the end plate 109 is bent upward, and the inlet and outlet tanks 104 and 105 are fitted and fixed. Further, a side plate 110 for reinforcing the core portion is provided on the outermost side of the core portion including the flat tube 102 and the corrugated fins 103.
Are arranged.

In such a heater 101, cooling water having a high temperature flows into the inlet tank 104 through the inlet pipe 107,
It passes through the inside of the flat tubes 102, which is approximately half the number of tubes 104. Then, it flows into the intermediate tank 106 and further flows from the intermediate tank 106 toward the outlet tank 105 in the flat tube 102. The cooling water that has flowed into the outlet tank 105 is then returned to the engine side through the outlet pipe 108.

In such a cooling water flow, while the cooling water having a high temperature flows through the flat tube 102,
The corrugated fins 103 are heat-exchanged with the air flowing in the direction indicated by the arrow F in FIG. The warm air, which has become high temperature due to this heat exchange, is blown out to the inside of the vehicle compartment.

Next, the flat tube 102 will be described with reference to FIG.

FIG. 1A is a front view of the tube 102 as seen from the side of the flat surface, and FIG. 1B is a view of the tube 102 as seen from the open end. On one flat side surface of the tube 102, a plurality of projections 200a are provided on one edge 204a side with respect to the center line 1 in the tube width direction.
Are formed. The protrusions 200a project toward the inner surface of the tube 102, have an oval shape having a major axis in the tube width direction, and are arranged at equal intervals over the entire length of the tube 102.

Further, on the other flat side surface of the tube 102, a plurality of projections 200b are provided on the other edge portion 204b side with respect to the center line 1 and the above-mentioned projections 200a
It is arranged in the same way.

The tube 102 is formed into a tubular shape by bending a strip-shaped plate material and joining the ends thereof by goby folding.
The goby-folded portion constitutes one edge portion 204a, and the folded portion constitutes the other edge portion 204b. FIG. 4 is a sectional view perpendicular to the axis in a state where the core metal is inserted into the tube 102. Core metal
The reference numeral 300 is for molding the tube 102 into a convex shape, and the core metal 300 itself has a convex shape in cross section.
However, the position of the tube 102 with respect to the protrusions 200a and 200b is thin so as not to interfere with the protrusions 200a and 200b.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and shows the flow of fluid flowing in the tube 102 with arrows. Fig. 3 shows the protrusion
The fluid flow when 200b is viewed from above is shown by an arrow.

As can be seen from FIG. 2, by forming the protrusions 200a and 200b, the fluid becomes a meandering flow and collides with the tube wall surface indicated by reference numeral I in FIG. 2 to improve the heat exchange efficiency. On the other hand, the region immediately downstream of the protrusions 200a, 200b (indicated by the symbol D in the figure) is likely to be a so-called dead water region, but as shown in FIG.
It prevents the occurrence of dead water.

The tube 102 is molded using an apparatus as shown in the schematic view of FIG. First, the strip-shaped plate material 408 is taken out from the metal-like material 407 obtained by winding a flat-plate metal in a coil shape and passed through the pair of projection forming rollers 409 to form the projections 200a and 200b on the strip plate-shaped 408. And then the first forming roller group
The cored bar 130 is inserted into the inside while passing through the inside of 410, and the band-shaped plate material 408 is bent.

A state in which the first forming roller group 410 is bent to the final shape in the final step, and thereafter the end portion 123 is wound by the winding portion compression roller 411, and then the core metal 130 is inserted by the second forming roller group 412. The final winding is closed.

Thereafter, the tube 102 subjected to the final winding process enters the solder bath 415 with the core metal 130 removed, and the outer periphery of the solder is covered with the solder. Next, it is formed in the cooling layer 416, and then finished by the finishing roller group 417 to a desired tube shape. Then, the cutting unit 419 cuts the tube into a predetermined size, and the molding of the tube 102 is completed. 418 is a pulse generator that controls the cutting operation of the cutting unit 419.

Tube 10 with the outer surface coated with solder as described above
Although 2 is molded, a plurality of tubes 102 are arranged and corrugated fins 103 are arranged between them, and an inlet tank 104, an outlet tank 105 and an intermediate tank 106 are temporarily attached to the upper and lower ends thereof, and a furnace (not shown) is provided. Then, the solder is melted and then the solder is solidified to assemble the heater 101 as shown in FIG.

Here, when the corrugated fins are laminated between the tubes 102, since the tube 102 has a cross-sectionally convex shape, when the corrugated fins 103 are pressed against the flat side surface of the tube, the central convex shape is The tube is elastically deformed inward by elastic force, and as a result, when the fin and the tube are assembled, the flat side surface of the tube is not arcuate but flat. Therefore, the joint between the tube and the corrugated fin can be ensured sufficiently reliably. If the cross-sectional shape of the tube 102 is not a convex shape but a concave shape that is recessed inward, there is a space between the tube and the corrugated fin when they are joined. However, the problem arises that the two are not joined sufficiently.

In the embodiment described above, the tube 102 and the corrugated fin 103 are made of a material made of aluminum alloy, but they may be made of a material such as brass. Further, the shape of the projections 200a, 200b formed on the tube 102 was such that the front view thereof has an elliptical shape, but the shape is not limited to this, and as shown in FIG. The elliptical protrusions 200a and 200b may be arranged in a staggered arrangement,
As shown in (b), it may be an elliptical shape inclined with respect to the center line l, or as shown in (c), it may be a staggered arrangement of triangular protrusions.

[Brief description of drawings]

FIG. 1 shows a tube of an embodiment of the present invention. FIG. 1 (a) is a plan view, FIG. 1 (b) is a view seen from the opening end side,
FIG. 2 is an enlarged view of II-II cross section of FIG. 1, FIG. 3 is a view of the protrusion from above, FIG. 4 is a cross sectional view of the tube perpendicular to the axis, and FIG. 5 is a perspective view of the embodiment, and FIG. FIG. 7 is a partial sectional perspective view of one embodiment of the embodiment, FIG. 7 is a plan view of a tube showing another embodiment, FIG. 8 is a schematic view showing a tube forming device, and FIG. 9 is a conventional example. It is a perspective view of a tube. 102 …… tube, 103 …… corrugated fin, 200a, 200b
...... Protrusion.

Claims (1)

[Claims] 1. A tube having a flat section in a cross section perpendicular to the axis, and wavy fins joined to the flat side surface of the tube, wherein the tube is flat by bending a band-shaped plate material and joining its ends. What is formed in a tubular shape, a plurality of projections protruding toward the inside of the tube are formed on both flat side surfaces of the tube, and the projections are formed on one flat side surface of the tube.
The heat is arranged only on one edge side of the width direction center line of the tube, and is arranged only on the other edge side of the tube width direction center line on the other flat side surface. Exchanger.