JP2000310498A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate dimensional error due to roll forming by avoiding the risk that a heat exchanging medium leaked from one passage is bypassed to other passage. SOLUTION: A tube section 6 comprises a first plate section 25, a first standing section 26 formed contiguously to the first plate section 25, a second plate section 27 parallel with the first plate section 25 formed contiguously to the side of the first standing section 26 opposite to the side end of the first plate section, a curved section 28 formed contiguously to the side of the second plate section 27 opposite to the side end of the first standing section, a third plate section 29 substantially parallel with the second plate section 27 and substantially coplanar with the first plate section 25 formed contiguously to the side of the curved section 28 opposite to the side end of the second plate section, and a second standing section 30 abutting on the first plate section 25 formed contiguously to the side of the third plate section 29 opposite to the side end of a second curved section, all of which can be formed by roll forming. A space 24 opening to the outside is formed between the tube sections 6, and connecting opening parts 7, 8 are formed by making a cut-off part 35 on one side end of the first plate section 25 in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a tube and a tank used in, for example, an air conditioner for a vehicle are separated from each other, and more particularly to a structure of a tube constituting the heat exchanger.

[0002]

2. Description of the Related Art As a heater core constituting a heating means of a vehicle air conditioner, the applicant of the present invention has a tube divided into two passages and laminated in a plurality of stages with corrugated fins interposed therebetween; A heat exchanger (counter-flow type heat exchanger) having two distribution tanks partitioned by partition walls so as to be perpendicular to the ventilation direction and having a tank separate from the tubes. It has been developed (for example, JP-A-8-94285).

The tubes used in this heat exchanger are formed, for example, by joining two forming plates face-to-face, and are inserted and partitioned from holes having substantially the same shape as the tubes formed on the end plate of the tank. Although it was connected and fixed to the tank by engaging with the concave part formed in the part, the end on the side opposite to the tank insertion side was aligned due to an error in the flow direction dimension of the tube or the depth dimension of the concave part. There was a possibility that it would be uneven. Further, when the concave portion of the partition portion and the boundary end portion between the passages of the tube do not closely contact each other due to a dimensional error or the like and have a gap, the heat exchange medium bypasses from this gap from one distribution tank to the other distribution tank. The heat exchange efficiency of the heat exchanger may be reduced. For this reason, there has been a problem that the dimensional accuracy between the concave portion of the partition portion and the boundary end portion between the passages of the tube must be strictly taken.

[0004] When there is a gap between the molding plates due to insufficient adhesion between the molding plates of the tubes, particularly at the central portion, the heat exchange medium leaked from one passage of the tube is bypassed to the other passage. Therefore, there arises a problem that the heat exchange efficiency of the heat exchanger is reduced.

Regarding the former problem, the applicant of the present invention has formed a space extending along the passage at the longitudinal end of the tube, as shown in Japanese Utility Model Laid-Open Publication No. 3-38564, and And two connection ports, and two connection holes are provided in the end plate of the tank, the connection port of the tube is inserted into the connection hole of the end plate, and a part thereof is protruded into the tank. A heat exchanger has been devised which absorbs dimensional errors in the flow path direction of the tubes by appropriately projecting them into the tank and eliminates the need for abutting the boundary end between the tube passages and the partition.

On the other hand, the latter problem is disclosed in
As disclosed in JP-A-123571, a structure of a tube formed by roll homing in which one plate is bent in multiple stages has been proposed. In this structure, however, a heat exchange medium must be used. Even if it leaks from one passage of the tube, it flows out to the outer surface of the tube, so that the risk of bypassing to the other passage of the tube can be eliminated.

[0007]

However, in the forming by roll homing, the dimensional error is larger than in the case where two forming plates are formed face-to-face, and therefore, for example, it is inserted from the connection hole formed in the end plate of the tank. Then, if the concave portion formed in the partition plate and the boundary end portion between the passages of the tube are brought into contact with each other and connected and fixed to the tank, the tank is inserted due to a longitudinal dimension of the tube or a dimensional error in the depth of the concave portion. If the heat exchange medium is bypassed from the gap between the boundary end between the tube passages and the recessed part of the partition, there is a possibility that the ends on the side opposite to the side will not be aligned and that there will be a step. It is more prominent than the traditional tubes that form.

Due to the dimensional error of the tube, the end on the side opposite to the tank insertion side may not be aligned and may be uneven, or the heat exchange medium may bypass the gap between the boundary end between the passages of the tube and the concave portion of the partition. As a means for solving the problem, the two connection ports are provided by forming a space between the passages at one end of the tube, and the connection ports are connected to the inside of the tank, as in the above-mentioned utility model publication. However, in the conventional forming by roll homing, as described in JP-A-6-123571, it is
Since the two passages are formed adjacent to each other, there is a problem that there is no space for forming a space between the passages.

However, as long as the tube is formed by joining two formed plates face to face, it is difficult to avoid the risk that the heat exchange medium leaked from one passage is bypassed to the other passage.

Therefore, according to the present invention, by forming the tube by roll homing, the dimensional error is increased by roll homing while avoiding the risk that the heat exchange medium leaked from one passage is bypassed to the other passage. In other words, the heat exchange medium bypasses from one distribution tank to the other distribution tank due to a gap between the partition and the tube due to unevenness, that is, the end on the side opposite to the tank insertion side is not aligned. It is another object of the present invention to provide a heat exchanger capable of eliminating the above problems at the same time.

[0011]

SUMMARY OF THE INVENTION A heat exchanger according to the present invention comprises a tube having two passages, at least one of which is open, fins arranged alternately with the tube, and a passage opening of the tube. And a tank arranged in two directions so that the tank is divided into two flow paths by a partitioning part so as to be at right angles to the ventilation direction, and by joining the tube and the tank, the passage of the tube is formed in the tank. A heat exchanger appropriately communicating with the flow path of
The end plate of the tank having the two flow paths is formed with a plurality of pairs of connection holes provided in parallel in the ventilation direction, and the tube has a substantially flat and elongated first flat plate portion, and the first flat plate portion. A first erected portion formed in a substantially right angle direction from both ends of the first erected portion, and a first erected portion formed in a right angle direction from an end of the first erected portion opposite the first flat plate portion; A second flat plate portion parallel to the first flat plate portion, and a first flat plate portion opposite to the second flat plate portion.
A substantially semicircular curved portion formed continuously from an end of the standing portion, and a second flat portion formed substantially continuously from an end of the curved portion opposite to the second flat portion. The third flat plate portion, which is parallel to the first flat plate portion and is coplanar with the first flat plate portion, is formed so as to be connected to the third flat plate portion in a direction perpendicular to the end of the third flat plate portion opposite the second curved portion, A second upright portion that is in contact with the inner surface of the first upright portion, the first flat portion, the first upright portion, the second flat portion, the curved portion, and the third flat portion. And the second upright portion forms a space between the two passages and an opening outside between the two passages, and forms a dividing portion on at least one of longitudinal ends of the first flat plate portion. The two connection ports that can be inserted into the connection holes of the tank are formed (claim 1).

Thus, the first flat portion, the first upright portion, the second flat portion, the curved portion, the third flat portion, and the second upright portion are all connected in series. Therefore, the tube according to this heat exchanger can be formed by roll homing in which one plate is bent in multiple stages to form a tube. Therefore, even if the adhesion of the tube is insufficient, the heat exchange medium only leaks out of the tube from the passage of the tube, so that the heat exchange medium does not bypass the other passage. On the other hand, the dimensional error in the longitudinal direction of the tube that occurs when the tube is formed by roll homing can be eliminated by adjusting the depth at which the connection port is inserted into the tank. Since the space is interposed, the heat of the heat exchange medium flowing in one passage is not transmitted to the heat exchange medium flowing in the other passage. Further, since there is no need to abut the partition portion and the boundary portion of the passage of the tube, a situation where a gap is formed between the partition portion and the tube does not occur. This prevents the heat exchange medium from bypassing the distribution tank.

Here, the dividing portion may be formed by stamping the first flat plate portion (claim 2) or may be formed by bending the first flat plate portion. (Claim 3).

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

A two-tank type heat exchanger 1 shown in FIG. 1 is used as a heater core in, for example, an air conditioner for a vehicle, and has a flat tube 2 and a corrugated fin 3 which are alternately laminated in a plurality of stages. It is constituted by inserting and joining both ends of the laminated tube 2 in the longitudinal direction to the tanks 4 and 5, and the tube 2 and the tanks 4 and 5 are separate members.

As shown in FIG. 5, the tube 2 has a tube portion 6, 6 having a passage through which a heat exchange medium flows.
And each of the pipe portions 6 has an opening on both sides in the longitudinal direction. At the end of the tube 2 on the tank 4 side, connection ports 7 and 8 for connecting to the tank 4 are formed.

As shown in FIGS. 1 and 2, the tank 4 has a substantially flat end plate 9 having an upright edge, and a tank peripheral wall 10 having a substantially arcuate cross section fitted into the end plate 9. It is basically composed of The end plate 9 and the tank peripheral wall 10 are formed of, for example, an aluminum alloy whose main material is aluminum clad with brazing material. However, the configurations of the end plate 9 and the tank peripheral wall 10 are not limited to the configurations shown in FIGS. 1 and 2, and as shown in FIG. However, as shown in FIG. 4, the configuration in which the tank peripheral wall 10 is fitted to the end plate 9 is the same as that of FIG. 2, but the claw portion 9a is further formed to protrude from the erected portion of the peripheral edge of the end plate 9. May be. The same components as those of the end plate 9 and the peripheral wall 10 of the tank 4 shown in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

A partition 11 is provided inside the tank 4 along the direction in which the tubes 2 are stacked.
A groove 1 formed on the top of the tank peripheral wall 10 on one side.
0a, and the other side is brought into contact with the inner surface of the end plate 9, so that the inlet side flow path 12 for distributing the heat exchange medium and the outlet side flow path 13 for collecting the heat exchange medium have substantially the same size. It is divided into pieces. An inlet / outlet pipe (not shown) is connected to each of the inlet side flow path 12 and the outlet side flow path 13 of the tank 4.

The end plate 9 is provided with a plurality of connection holes 15, 15 into which the connection ports 7, 8 of the tubes 2 are inserted, in parallel in the stacking direction of the tubes 2.

As shown in FIG. 1, the tank 5 also has a flat end plate 16 and a tank peripheral wall 1 having a substantially arcuate cross section.
7. In this embodiment, the connection hole 18 provided in the end plate 16 for connecting the tube 2 has substantially the same cross-sectional shape as the central portion in the longitudinal direction of the tube 2. However, when connection ports 7 and 8 similar to those on the tank 4 side are formed on the tank 5 side of the tube 2, a plurality of connection holes 18
Are provided in parallel in the stacking direction.

As shown in FIGS. 5 to 7, the tube 2 used in the heat exchanger 1 has a substantially flat first flat plate portion 25 and two ends of the first flat plate portion 25. The first upright portions 26, 26 formed so as to be connected to the first flat plate portion 25 in a direction substantially perpendicular to the first flat plate portion 25, and the first upright portion 26 from the end opposite to the first flat plate portion to the first upright portion 26. A second flat plate portion 27, 27 formed to be connected to the upright portion 26 in a direction perpendicular to and parallel to the first flat plate portion 25, and an anti-first upright portion of the second flat plate portion 27 A substantially semicircular curved portion 28, 28 formed from the side end to be connected to the second flat plate portion 27, and connected to the bent portion 28 from the opposite end of the bent portion 28 to the second flat plate portion. And third flat plate portions 29, 29 which are substantially parallel to the second flat plate portion 27 and are coplanar with the first flat plate portion 25. The second flat plate portion 29 is formed so as to be connected to the third flat plate portion 29 in a direction perpendicular to the third flat plate portion 29 from the end opposite to the second curved portion, and is in contact with the inner surface of the first upright portion 26. The upright portions 30, 30 basically constitute the tube portions 6, 6. For this reason, these first flat plate portions 25,
Since the first upright portion 26, the second flat portion 27, the curved portion 28, the third flat portion 29, and the second upright portion 30 are all connected in series, they can be formed by roll homing. You can do it.

Then, in the process of roll homing, a U-shaped space 24 is formed between the pipe portions 6 and the first flat plate portion 25 is cut out from its end to the center. As a result, the dividing portion 35 is formed, and the tube 2 is provided with the connection ports 7 and 8 at least at one end in the longitudinal direction. Finally, the first standing portion 26 and the second standing portion 3
At the portion where the abutment is in contact with the O, it is bonded by various means such as electric sewing, soldering, and brazing in a furnace.

As a result, the adhesion at the central portion in the longitudinal direction of the tube 2 is insufficient.
Even if a gap is formed between the second standing portion 30 and the second standing portion 30, the heat exchange medium leaked from this gap only exits the tube portion 6 of the tube 2 and does not bypass into the other tube portion 6. . Similarly, since the adhesion at the portions constituting the connection ports 7 and 8 of the tube 2 is insufficient, the first standing portion 26
Even when a gap is formed between the heat exchange medium and the second standing portion 30, the heat exchange medium leaked from the gap is not removed from the connection ports 7 and 8 of the tube 2.
There is no bypass in the other connection ports 7 and 8 only by going out.

However, the structure of the tube 2 used in the heat exchanger is not limited to those shown in FIGS. 5 to 7, but may be, for example, those shown in FIGS. is there. In the following, FIGS.
The tube 2 shown in FIG.

As shown in FIGS. 8 to 11, the tube 2 is different from the above-described embodiment in that
The only difference is that they are approximately half of 6 'and 26'. Therefore, the first flat plate portion 25, the first upright portions 26 ', 26', the second flat plate portions 27, 27, and the curved portion 2
8, 28, third flat plate portions 29, 29 and third standing portion 3
Since 0 and 30 are all connected in series, they can be formed by roll homing by bending a single thin plate in multiple stages.

In the course of the roll homing,
A U-shaped space 24 is formed between the pipe portions 6, and a notch is formed in the first flat plate portion 25 extending from an end of the first flat plate portion 25 in a central direction, and a notch intersecting at right angles to the notch. And a substantially T-shaped notch of FIG.
As shown by the dashed line, the portions 25 ′ and 25 ′ are bent inward and bent into the second standing portions 30, so that a dividing portion 35 is formed between the pipe portions 6, The tube 2 has connection ports 7 and 8 at least at one end in the longitudinal direction. Finally, at a portion where the first flat plate portion 25 and the first standing portion 30 are in contact with each other, and a portion where the second standing portion 30 and the cut portion 25 ′ are in contact with each other, electric resistance welding, soldering, and furnace It is bonded by various means such as brazing.

As a result, since the adhesive is insufficient at the central portion in the longitudinal direction of the tube 2, even if a gap is formed between the end of the upright portion 22 and the first flat plate portion 22, leakage occurs through this gap. The heat exchange medium that has just exited the tube 6 of the tube 2 does not bypass into the other tube 6. Similarly, since the adhesion at the portions constituting the connection ports 7 and 8 of the tube 2 is insufficient, the end of the cut portion 23 and the second flat plate portion 21, and the cut portion 23 and the upright portion 22 are formed.
Is formed, the heat exchange medium leaked from the gap only exits the connection ports 7 and 8 of the tube 2 and does not bypass into the other connection ports 7 and 8.

However, in any of the tubes 2 shown in FIGS. 5 to 8 and the tubes 2 shown in FIGS. 9 to 11, the tube 9 does not come into contact with the partition 11 and the end of the tube 9. And the tank 4 can be joined, so that it is not necessary to adopt strict dimensional accuracy when joining the partition and the tube as in the conventional heat exchanger.

The tube 2 is formed by roll homing.
Regarding the dimensional error in the longitudinal direction of the tube 2 caused by molding the connection ports 7, 8, the connection ports 7, 8 are inserted into the tank 4.
It can be solved by adjusting with.

Finally, in this embodiment, FIGS.
Alternatively, as shown in FIGS. 9 to 11, an inner fin 31 that is bent in a substantially triangular shape is arranged along the longitudinal direction of the tube 2 in the tube portion 6 of the tube 2.
The inner fins 31 are for preventing the tube portion 6 of the tube 2 from being deformed during bonding such as brazing in a furnace.

[0031]

As described above, according to the present invention, the first flat portion, the first upright portion, the second flat portion, the curved portion, the third flat portion, and the second upright portion of the tube are provided. Since all are connected, they can be formed by roll homing, so even if the adhesion of the tube is insufficient, the heat exchange medium only leaks out of the tube from the passage and heat exchanges into the other passage. Bypassing of the medium can be avoided, deterioration of the heat exchange capacity of the heat exchanger can be prevented, and defective products can be easily found by this leakage.

On the other hand, the dimensional error in the longitudinal direction of the tube caused when the tube is formed by roll homing can be solved by adjusting the depth at which the connection port is inserted into the tank. Further, since the tube and the tank can be joined without making the partition and the boundary end of the passage of the tube come into contact with each other, it is not necessary to take strict dimensional accuracy when joining the partition with the tube. Further, since the two passages are formed so as not to be adjacent to each other, it is possible to prevent the heat of the heat exchange medium flowing in one passage from being transmitted to the heat exchange medium flowing in the other passage. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of the heat exchanger according to the first embodiment in a cutaway manner.

FIG. 2 is an end view showing a configuration of a connecting portion between a tank and a tube of the heat exchanger according to the first embodiment.

FIG. 3 is an end view showing a tank including an end plate and a tank peripheral wall having a configuration different from that of the end plate and the tank peripheral wall constituting the tank shown in FIG. 2;

FIG. 4 is an end view showing a tank having an end plate and a tank peripheral wall having a configuration different from that of the end plate and the tank peripheral wall constituting the tank shown in FIG. 2 or FIG. 3;

FIG. 6 is an enlarged view of a main part showing a configuration of a tube having a connection port in the heat exchanger according to the first embodiment.

FIG. 6 is a cross-sectional view taken along line AA of the tube shown in FIG. 5;

7 and FIG. 7 are cross-sectional views taken along the line BB of the tube shown in FIG.

FIG. 8 is an enlarged view of a main part showing a configuration of a tube having a connection port in a different embodiment from the tube shown in FIG. 6;

9 is a cross-sectional view of the tube shown in FIG. 8, taken along line CC.

FIG. 10 is a sectional view taken along line DD of the tube shown in FIG. 8;

FIG. 11 is an explanatory diagram showing a dividing portion formed by bending.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat exchanger 2 tube 3 fin 4 tank 5 tank 6 pipe 7 connection port 8 connection port 9 end plate 11 partition section 12 inlet side flow path 13 outlet side flow path 14 inlet / outlet pipe 15 connection hole 16 end plate 18 connection Hole 24 Space 25 First flat portion 26 First upright portion 27 Second flat portion 28 Curved portion 29 Third flat portion 30 Second upright portion 35 Splitting portion

Claims (3)

[Claims] 1. A tube having at least one tube having two passages, fins alternately arranged with the tube, and a tank arranged in the passage opening direction of the tube, wherein the tank is ventilated by a partition. In a heat exchanger that is divided into two flow paths so as to be at right angles to the direction, and the tube and the tank are joined so that the passage of the tube communicates with the flow path of the tank as appropriate, The end plate of the tank with the channel
A plurality of pairs of connection holes are formed in parallel with each other in the ventilation direction, and the tube is formed by connecting a substantially flat and elongated first flat plate portion and both ends of the first flat plate portion in a substantially right angle direction. A first standing portion and a second flat plate portion formed in a direction perpendicular to the end of the first standing portion opposite to the first flat plate portion and parallel to the first flat plate portion. A substantially semicircular curved portion formed from the end of the second flat portion opposite to the first upright portion; and a curved portion formed from the end of the curved portion opposite to the second flat portion. Formed and substantially parallel to the second flat plate portion,
A third flat plate portion coplanar with the first flat plate portion,
A second upright portion formed in a direction perpendicular to the end of the third flat plate portion opposite to the second curved portion and in contact with an inner surface of the first upright portion; The first flat portion, the first standing portion, the second flat portion, the curved portion, the third flat portion, and the second flat portion.
Forming an open space between the two passages and the outside of the passage by the upright portion, and forming a dividing portion on at least one of longitudinal ends of the first flat plate portion; Characterized in that two connection ports that can be inserted into the connection holes are formed. 2. The heat exchanger according to claim 1, wherein the dividing portion is formed by stamping a first flat plate portion. 3. The heat exchanger according to claim 1, wherein the dividing portion is formed by bending a first flat plate portion.