JP2003094135A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger efficiently producible having good operability to insertion of a tube into a tank and good tendency to brazing between the tank and the tube. SOLUTION: An insertion part 43 is provided for inserting ends of a tube 2 and a side plate 8. The insertion part 43 comprises an insertion hole 431 and a taper 432. The tube is bonded with the tank by brazing. The tube has no brazing material layer, while the tank has a brazing material layer. A recessed part, the section of which is V-shaped, is formed on the peripheral surface having the brazing material layer on the tank by plastic deformation. Subsequently, all or a part of the insertion hole is longitudinally formed in the bottom of the recessed part, and the remainder of the recessed part is tapered. The insertion part is formed by press working. The distance from the longitudinal end of the tank to the nearest insertion part is smaller than that from one to another insertion part.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat exchanger.

[0002]

2. Description of the Related Art A so-called parallel flow type heat exchanger is known as a heat exchanger for an automobile air conditioner. This includes a plurality of flat tubes and a tubular tank that communicates with the tubes. The medium is distributed from the tank to the tubes, and the media flowing through the tubes are collected in the tank.

The tubes are usually fitted with fins to increase the heat transfer area. Further, the side plates are supported by the tank in order to protect the outermost fins and to reinforce the structural strength of the heat exchanger as a whole.

The tank is provided with a tube insertion hole for inserting the end portion of the tube and a side plate insertion hole for inserting the end portion of the side plate, and the end opening of the tank is closed by a closing member.

After the above components are assembled, they are joined together by brazing in a furnace.

An insertion guide for guiding the end of the tube to the tube insertion hole is provided around the tube insertion hole. As this insertion guide, conventionally, there is a tube insertion hole having a burring process as shown in FIG.

As a result, it is not necessary to accurately align the end of the tube 2 with the tube insertion hole 44 when assembling the tube 2, and the end of the tube 2 is rounded.
In this case, the end portion of the tube 2 is guided by the rounded portion 46 and inserted into the tube insertion hole 44, so that the efficiency of the assembling work can be improved.

By the way, in the heat exchanger of the air conditioner for an automobile, the length of the tank is different depending on the type of the automobile in which it is installed, and a die for manufacturing the tank is required for each tank having a different length.

However, since the tube pitch is the same even if the tank lengths are different, it is proposed that the tube insertion holes and the side plate insertion holes be made common and the tanks having different lengths be manufactured by a common mold. ing.

Thus, when manufacturing heat exchangers having the same tube pitch and different tank lengths, it is not necessary to manufacture a mold for each tank having a different length, and the manufacturing cost is reduced.

[0011]

In the case of the above insertion guide by burring, there are the following problems.

That is, when the tank 4 has the brazing material layer F on the outer surface as shown in FIG. 8, since the brazing material layer F exists at the joint between the tank 4 and the tube 2, the brazing material layer F is formed during brazing. When melted, a gap is created between the tank 4 and the tube 2, which deteriorates the brazing property of the tube 2.

When manufacturing tanks having different lengths with a common mold, there are the following problems.

That is, when the punch scratches the longitudinal end of the tank, the punch is pressed by the longitudinal end of the tank to be deformed, causing damage to the punch.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a heat exchanger which is excellent in insertability of a tube into a tank and brazability between the tank and the tube and which can be efficiently manufactured. With the goal.

[0016]

The invention according to claim 1 is
In a heat exchanger including a flat tube and a tubular tank into which the end of the tube is inserted, an outer peripheral surface of the tank is provided with an insertion portion for inserting the end of the tube, The insertion portion includes an insertion hole and a tapered portion that guides the end portion of the tube to the insertion hole, the tube and the tank are joined by brazing, and the tube has a brazing material layer on the outer surface. First, the tank has a brazing filler metal layer on its outer peripheral surface, and after forming a concave portion having a V-shaped cross section by plastic deformation on the outer peripheral surface of the tank having the brazing filler metal layer,
The heat exchanger is characterized in that all or a part of the insertion hole in the longitudinal direction is formed in the valley bottom of the recess, and the remaining portion of the recess is the tapered portion.

According to the present invention, even if the tank has the brazing material layer on the outer surface, since the brazing material layer does not exist at the joint between the tube and the tank, the brazing property of the tube is improved, and The tapered portion improves the tube insertability.

According to a second aspect of the present invention, in a heat exchanger provided with a flat tube and a tubular tank into which the end of the tube is inserted, the end of the tube is linearly cut, The tank has a curved outer peripheral surface, an insertion portion for inserting an end portion of the tube is provided on the curved outer peripheral surface of the tank, and the insertion portion has an insertion hole long in the circumferential direction of the tank. , A tapered portion for guiding the end portion of the tube to the insertion hole, the tapered portion,
The heat exchanger is characterized in that it is formed by press working only on a part of the insertion hole in the longitudinal direction.

According to the present invention, since the tapered portion is formed only in a part of the insertion hole in the longitudinal direction, the deformation of the insertion hole due to press working is less than that in the case where it is formed for the entire insertion hole, and the tapered portion of the tube is Good brazing property.

When the end of the tube is straight and the outer peripheral surface of the tank is curved, only a part of the end of the tube in the width direction is first inserted into the tank. If the taper portion is provided in, the insertability will not be impaired even if only a part of the taper portion is provided.

According to a third aspect of the present invention, there is provided heat including a plurality of flat tubes, reinforcing side plates, and a tubular tank into which the ends of the tubes and the ends of the side plates are inserted. In the exchanger, on the outer peripheral surface of the tank, an insertion portion of the same shape and size that is long in the circumferential direction of the tank,
Provided at equal intervals over the longitudinal direction of the tank, the end portion of the tube and the end portion of the side plate are respectively inserted into the insertion portion, and the insertion portion is inserted into the insertion hole and the insertion hole of the tube. An end portion and a taper portion that guides the end portion of the side plate, and is formed by press working. A die for the press working has a punch corresponding to the insertion portion, and the punch is the insertion portion. While being provided at the same intervals as the parts, the distance from the longitudinal end of the tank to the closest insertion part is smaller than the number of the insertion parts, and the distance from the insertion parts is smaller than the interval between the insertion parts. It is a characteristic heat exchanger.

According to the present invention, when manufacturing heat exchangers having the same tube pitch and different tank lengths, tanks having different lengths can be efficiently manufactured with a common mold.
Manufacturing costs are reduced. Moreover, since the distance from the longitudinal end of the tank to the closest insertion portion is smaller than the distance between the insertion portions, the punch does not scratch the longitudinal end of the tank, and the punch is not damaged due to contact. To be prevented.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view showing the heat exchanger of this example.

The heat exchanger 1 of this embodiment is constructed by alternately stacking a plurality of tubes 2 and a plurality of fins 3, and connecting the ends of each tube 2 to a pair of tanks 4, respectively.

The inside of the tank 4 is partitioned by a partition plate 5 so that the medium flows in a meandering manner from the tank 4 to the tank 4. Further, the end opening of the tank 4 is also closed by the partition plate 5.

The medium is an inlet portion 61 provided in the tank 4.
Is taken into the inside of the tube 2 and is heat-exchanged by the heat transmitted to the tube 2 and the fins 3, and is circulated in a meandering shape through the tube 2, and then discharged to the outside from an outlet portion 62 provided in the tank 4.

A lid-shaped external mounting member 7 is externally fitted to the end of the tank 4. The external mounting member 7 includes a locking pin 71, and the locking pin 71 is locked in a corresponding locking hole provided in the frame of the vehicle body so that the heat exchanger 1 can be mounted on the vehicle body. There is.

Side plates 8 are provided above and below the layer composed of the tubes 2 and the fins 3, and the end portions of the side plates 8 are supported by the tank 4.

FIG. 2 is an exploded perspective view showing the tank, side plate, tubes and fins of this embodiment.

As shown in FIG. 2, the tank 4 of this embodiment has a tank plate 41 and an end plate 42 each having a substantially U-shaped cross section.
And are combined in a substantially cylindrical shape.

The end plate 42 is provided with a plurality of insertion portions 43 of the same shape and size at equal intervals in the longitudinal direction. The end of the tube 2 and the end of the side plate 8 are
Each is inserted into the insertion portion 43. The insertion portion 43 includes an insertion hole 431 and a taper portion 432 that guides the end portion of the tube 2 and the end portion of the side plate 8 into the insertion hole 431.

Tank plate 41 and end plate 42
Means that after combining them into a substantially cylindrical shape, the tank plate 41
The caulking claws 411 provided in the are caulked and temporarily fixed, and are joined by brazing in the furnace.

The insertion of the end portion of the tube 2 and the end portion of the side plate 8 into the tube insertion portion 43 is performed simultaneously with the side plate 8, the tube 2 and the fins 3 stacked.

Considering the ease of assembly and the space for installing the heat exchanger, etc., the side plate 8 and the tube 2
The fins 3 have substantially the same width.

The width of the side plate 8 is substantially equal over the entire length, and only the tip is slightly tapered to enhance the insertability.

At both ends of the side plate 8 in the width direction,
A rising portion 81 is provided except for the portion to be inserted into the end plate 42, and the rising amount 81 is brought into contact with the end plate 42 to regulate the insertion amount.
The insertion amount regulation means for the side plate 8 also regulates the insertion amount of the tube 2 laminated with the side plate 8.

FIG. 3 is a vertical sectional view showing the insertion portion of this example.

The tube 2 has no brazing material layer on its outer surface, and the tank 4 has a brazing material layer F on its outer peripheral surface.

On the outer peripheral surface of the tank 4 having the brazing material layer F,
After forming a recess having a V-shaped cross section by plastic deformation, an insertion hole 431 was punched in the valley bottom of this recess, and the remaining portion of the recess was made into a taper portion 432.

As a result, the inside of the insertion hole 431 joined to the tube 2 becomes a sheared surface and has no brazing material layer, so that the brazing property of the tube 2 is good, and the tapered portion 432 allows the tube 2 to be brazed. Insertability is improved.

FIG. 4 is a cross-sectional view showing the insertion portion of this example.

As shown in FIG. 4, the tapered portions 432 are not formed at both ends of the insertion hole 431 in the longitudinal direction. That is, since it is formed only in part in the longitudinal direction, the insertion hole 431 is less deformed by press working and brazability with the tube 2 is better than in the case where it is formed in all.

When the end portion of the tube 2 is linearly cut and the end plate 42 is curved as in the present example, only a part of the end portion of the tube, that is, only the central portion in the width direction is first formed. Since it is inserted into the end plate 42, if a taper portion 432 is provided in a portion corresponding to it,
Even if the taper portion 432 is only a part, the insertability is not impaired.

The smaller the radius of curvature of the end plate 42, the smaller the ratio of the portion where the tapered portion 432 is provided.

5 to 7 are sectional views showing the end plate and the press die. The process of forming the tube insertion portion of this example will be described with reference to FIGS.

As shown in the figure, the end plate 4 of this example
The press die for forming the tube insertion portion 43 in 2 includes an upper die having a plurality of punches 91 arranged in a punch holder (not shown), a stripper plate 92 for fixing the end plate 42 which is a work, It is composed of a lower die 93.

The stripper plate 92 has a plurality of guide holes 921 for guiding the punch 91, and the die 93 has a plurality of die holes 931 for immersing the tip end portion of the punch 91 therein.

The die hole 931 of the die 93 is provided with a taper portion 931a for widening the opening, and the punch 91 is provided with
A step portion 911 for pressing the end plate 42 against the tapered portion 931a is provided.

First, with the end plate 42 set in the die 93, the punch 91 descends together with the stripper plate 92. When the stripper plate 92 comes into contact with the end plate 42, the end plate 42 is sandwiched between the stripper plate 92 and the die 93 and fixed so as not to move (see FIG. 5).

When the punch 91 is further lowered, the punch 91
The end plate 42 is plastically deformed into a V shape by being pushed by
The taper portion 432 is preformed (see FIG. 6).

When the punch 91 is further lowered, the insertion hole 431 is punched by the tip of the punch 91. Furthermore,
The taper portion 432 is formed by the step portion 911 of the punch 91 and the die 93.
It is sandwiched between the tapered portions 931a and pressed against the surface. (See Figure 7).

As described above, in this example, the punching of the insertion hole 431 and the formation of the tapered portion 432 are performed simultaneously, so that the process can be simplified. Moreover, since the tapered portion 432 is preliminarily formed before the punching of the insertion hole 431, the deformation of the insertion hole 431 when the surface of the tapered portion 432 is pressed can be significantly reduced.

In this example, tank plates of tanks having different lengths are manufactured by a common mold, and as shown in FIG. 7, from the end of the end plate 42 in the longitudinal direction to the nearest insertion portion 43. The distance A is the distance B between the insertion portions 43.
Is set smaller than.

As a result, the end of the end plate 42 in the longitudinal direction does not come into contact with the punch 91, so that the punch 91 is prevented from being damaged.

[0056]

As described above, the invention according to claim 1 is a heat exchanger including a flat tube and a cylindrical tank into which an end of the tube is inserted. The surface is provided with an insertion portion for inserting the end portion of the tube, and the insertion portion includes an insertion hole and a taper portion for guiding the end portion of the tube to the insertion hole, and the tube and the tank. Is joined by brazing,
The tube does not have a brazing material layer on the outer surface, the tank has a brazing material layer on the outer peripheral surface, and a concave portion having a V-shaped cross section is formed on the outer peripheral surface having the brazing material layer of the tank by plastic deformation. After that, the heat exchanger is characterized in that all or part of the insertion hole in the longitudinal direction is formed in the valley bottom of the recess, and the remaining portion of the recess is the tapered portion.

According to the present invention, even if the tank has the brazing material layer on the outer surface, since the brazing material layer does not exist at the joint between the tube and the tank, the brazing property of the tube is improved, and The tapered portion improves the tube insertability.

According to a second aspect of the present invention, in a heat exchanger including a flat tube and a tubular tank into which the end of the tube is inserted, the end of the tube is cut linearly, The tank has a curved outer peripheral surface, an insertion portion for inserting an end portion of the tube is provided on the curved outer peripheral surface of the tank, and the insertion portion has an insertion hole long in the circumferential direction of the tank. , A tapered portion for guiding the end portion of the tube to the insertion hole, the tapered portion,
The heat exchanger is characterized in that it is formed by press working only on a part of the insertion hole in the longitudinal direction.

According to the present invention, since the tapered portion is formed only in a part of the insertion hole in the longitudinal direction, the deformation of the insertion hole due to press working is less than that in the case where it is formed for the entire insertion hole, and the tube is Good brazing property.

According to a third aspect of the present invention, there is provided a heat exchanger comprising a plurality of flat tubes, reinforcing side plates, and a tubular tank into which the ends of the tubes and the ends of the side plates are inserted. In the exchanger, on the outer peripheral surface of the tank, an insertion portion of the same shape and size that is long in the circumferential direction of the tank,
Provided at equal intervals over the longitudinal direction of the tank, the end portion of the tube and the end portion of the side plate are respectively inserted into the insertion portion, and the insertion portion is inserted into the insertion hole and the insertion hole of the tube. An end portion and a taper portion that guides the end portion of the side plate, and is formed by press working. A die for the press working has a punch corresponding to the insertion portion, and the punch is the insertion portion. While being provided at the same intervals as the parts, the distance from the longitudinal end of the tank to the closest insertion part is smaller than the number of the insertion parts, and the distance from the insertion parts is smaller than the interval between the insertion parts. It is a characteristic heat exchanger.

According to the present invention, when manufacturing heat exchangers having the same tube pitch and different tank lengths, tanks having different lengths can be efficiently manufactured with a common mold.
Manufacturing costs are reduced. Moreover, since the distance from the longitudinal end of the tank to the closest insertion portion is smaller than the distance between the insertion portions, the punch does not scratch the longitudinal end of the tank, and the punch is not damaged due to contact. To be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing a heat exchanger according to a specific example of the present invention.

FIG. 2 is an exploded perspective view showing a tank, side plates, tubes, and fins according to an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing an insertion portion according to a specific example of the present invention.

FIG. 4 is a transverse cross-sectional view showing an insertion portion according to a specific example of the present invention.

FIG. 5 is a cross-sectional view showing an end plate and a press die according to a specific example of the present invention.

FIG. 6 is a cross-sectional view showing an end plate and a press die according to a specific example of the present invention.

FIG. 7 is a cross-sectional view showing an end plate and a press die according to a specific example of the present invention.

FIG. 8 is a cross-sectional view showing a tube insertion hole according to a conventional example.

[Explanation of symbols]

1 heat exchanger 2 tubes Three fins 4 tanks 41 tank plate 411 caulking nails 42 End plate 43 Insert 431 insertion hole 432 taper 44 Tube insertion hole 45 Burling 46 are section 5 partition plates 61 Entrance 62 Exit 7 External mounting members 71 Locking pin 8 side plates 81 Rising part 91 punch 911 step 92 Stripper plate 921 Guide hole 93 die 931 mold hole 931a Tapered part F brazing material layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F28F 9/02 301 F28F 9/18 9/18 B23K 101: 14 // B23K 101: 14 F28F 9/00 311D (72) Inventor Manabu Yamashita Address 39, Higashihara, Chiyo-ji, Konan-cho, Osato-gun, Saitama Prefecture ZEXXEL Valeo Climate Control F-term (Reference) 3L065 CA17 4E048 KA02 KA04

Claims (3)

[Claims] 1. A heat exchanger comprising a flat tube and a tubular tank into which an end of the tube is inserted, wherein an outer peripheral surface of the tank has an insertion portion into which the end of the tube is inserted. And the insertion portion includes an insertion hole and a taper portion that guides the end portion of the tube into the insertion hole, the tube and the tank are joined by brazing, and the tube is brazed to the outer surface. The tank does not have a material layer, the tank has a brazing material layer on the outer peripheral surface, and the concave portion having a V-shaped cross section is formed by plastic deformation on the outer peripheral surface having the brazing material layer of the tank. A heat exchanger characterized in that the whole or a part in the longitudinal direction is formed in the valley bottom of the recess, and the remaining portion of the recess is the tapered portion. 2. A heat exchanger comprising a flat tube and a tubular tank into which the end of the tube is inserted, wherein the end of the tube is cut linearly, and the tank has a curved outer periphery. An insertion portion for inserting an end portion of the tube is provided on the curved outer peripheral surface of the tank, the insertion portion includes an insertion hole long in a circumferential direction of the tank, and the insertion hole to the insertion hole. It consists of a taper part that guides the end of the tube, and the taper part is only in a part of the longitudinal direction of the insertion hole,
A heat exchanger characterized by being formed by pressing. 3. A heat exchanger comprising a plurality of flat tubes, a side plate for reinforcement, and a tubular tank into which an end portion of the tube and an end portion of the side plate are inserted. On the outer peripheral surface of the tank, insert portions of the same shape and size that are long in the circumferential direction of the tank are provided at equal intervals over the longitudinal direction of the tank, and the end portion of the tube and the end portion of the side plate are
Each of the insertion portions is inserted into the insertion portion, and the insertion portion includes an insertion hole and a taper portion that guides the end portion of the tube and the end portion of the side plate to the insertion hole, and is formed by press working. A die for processing includes a punch corresponding to the insertion portion, the punch is provided at the same interval as the insertion portion, and is provided in a number larger than the number of the insertion portions, and the punch in the longitudinal direction of the tank. The heat exchanger characterized in that the distance from the end to the closest insertion portion is smaller than the distance between the insertion portions.