JP3305429B2 - Perforated tube material for heat exchanger, extrusion die for producing the tube material, and method for producing the tube material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous tube made of metal such as aluminum for a heat exchanger used in a condenser for a car cooler, an extrusion die for producing the tube, and the like.
And a method for manufacturing the tube material.

[0002]

2. Description of the Related Art For example, as a tube for an air conditioner condenser, there is a tendency to use an aluminum porous flat tube whose inside is divided into a plurality of chambers in a width direction by a partition wall in order to improve pressure resistance.

However, in this tube, the air flowing in the core in the front-rear direction actively exchanges heat with the refrigerant flowing mainly in the windward direction in the tube. Does not perform sufficient heat exchange with the refrigerant flowing through the tube, so that the refrigerant flowing through the leeward side of the tube in the width direction is insufficiently condensed, and the heat exchange efficiency does not increase above a certain limit. Was.

[0004] In view of the above, there has been proposed a porous flat tube having a structure in which a hole is provided in a partition wall to connect adjacent passages (Japanese Patent Laid-Open No. 58-1983).
No. 136419).

This tube is made of an extruded aluminum product. In a male and female combined die having a molding gap corresponding to the cross-sectional shape of the perforated tube, the tip of the mandrel is moved forward and backward to the molding gap for molding the partition wall. The extruded material is allowed to pass through the partition wall forming gap by retracting the mandrel tip from the partition wall forming gap, while the mandrel tip is advanced into the partition wall forming gap. The mandrel is manufactured by moving the mandrel forward and backward at a predetermined timing in this manner during extrusion (see the same publication).

According to the tube having such a structure, the refrigerant in the tube travels in the width direction through the communication hole, and the condensation of the refrigerant passing through the tube is promoted.
Heat exchange efficiency is improved.

An object of the present invention is to provide a heat exchanger tube material capable of realizing further improvement in heat exchange efficiency under such technical background.

[0008] The present invention also provides an extrusion die and a manufacturing method capable of realizing the manufacture of such a tube material, and at the same time, performing the manufacture with good productivity and at a low cost. The purpose is to:

[0009]

In order to achieve the above object, a first aspect is provided.
The invention of the present invention is a flat heat exchanger tube material in which the inside is divided into three or more chambers in the width direction by a plurality of partition walls, and each partition wall is provided with a hole for communicating adjacent chambers. The heat exchanger tube material is characterized in that the communication holes of at least two or more partition walls are provided in the tube length direction so as to be left-right asymmetric.

A second invention is directed to a female mold having a forming hole for forming an outer peripheral portion of a flat tube material, and forming three or more chambers in the width direction in the flat tube material. By using an extrusion die for the production of a tube material for a heat exchanger of a male and female combination type combining male and female molds having a number of molding projections, by changing extrusion conditions such as ram speed during extrusion, all the material confluence parts Any of an extruded state in which the material is flowed through the material, an extruded state in which the material is flown in a part of the material merging portion in one or more modes, and an extruded state in which the material is not flowed in the material merging portion is two or more. A method for producing a porous tube material for a heat exchanger, characterized in that the method is varied.

The third invention is a female mold having a forming hole for forming an outer peripheral portion of a flat tube material, and three or more chambers are formed in the flat tube material in a width direction. In a male and female combination type extrusion die for manufacturing a tube material for a heat exchanger in which a male mold having a number of molding projections is combined, extruded materials are easily merged in at least two or more of the material junctions between the molding projections. The present invention provides an extrusion die for producing a porous tube material for a heat exchanger, characterized in that the extrusion die is formed so as to cause a difference.

A fourth invention is a female mold having a forming hole for forming an outer peripheral portion of a flat tube material, and three or more chambers are formed in the flat tube material in the width direction. An extruding die for producing a tube material for a heat exchanger of a male / female combination type in which a male mold having a number of forming protrusions is combined, wherein the extruded materials are joined at at least two or more of the material joining portions between the forming protrusions. By using a die formed on the one that causes a difference in ease, by changing the extrusion conditions such as ram speed during extrusion, the extruded state in which the material flows through all the material merging sections, and some material merging sections Characterized in that one or more of an extruded state in which a material is flowed to the material and an extruded state in which no material is flowed in the material confluence section are changed into two or more extruded states. How to make tube material The the gist.

[0013]

In the tube material according to the first aspect of the invention, the communication holes of the at least two or more partition walls are provided in the tube length direction so as to be asymmetrical to each other, so that the inside of the tube material flows. The turbulence of the flow of the heat exchange medium is promoted, the movement of the heat exchange medium in the width direction is performed more effectively, and the heat exchange performance is improved.

Further, in the manufacturing method according to the second aspect of the present invention, by changing the extrusion conditions such as the ram speed during the extrusion, the extruded state in which the material flows through all the material converging portions in the die, The extrusion condition of one or more modes in which the material is flowed through the material and the extrusion state in which the material is not flowed into the material confluence portion are changed into the two or more extruded states. Depending on the setting, a tube material in which the communication holes of at least two or more partition walls are provided asymmetrically with respect to each other in the tube length direction is manufactured.

In addition, changing the extrusion conditions during the extrusion can be easily achieved by using an ordinary extruder.

Further, in the extrusion die according to the third invention,
By being formed in a material that causes a difference in the ease of merging of the extruded materials in at least two or more of the material merging portions between the forming convex portions, by changing extrusion conditions such as ram speed during extrusion, An extruded state can be formed in which the material flows through all the material merging portions, the material flows through some of the material merging portions, or the material does not flow through the material merging portions. Therefore, during the extrusion, by changing the extrusion state to such an extrusion state, each of the communication holes of at least two or more partition walls is provided in a tube length direction in a left-right asymmetric state with respect to each other. The material is manufactured.

In addition, changing the extrusion conditions during extrusion can be easily achieved by using an ordinary extruder, as described above. In addition, at least two or more of the material converging portions between the forming convex portions are formed. Forming a die into one that produces a difference in the ease of joining the extruded materials does not involve any difficulty in making the die.

Further, in the manufacturing method according to the fourth invention, the extrusion die such as the ram speed is changed during the extrusion by using the extrusion die according to the third invention so that the material flows through all the confluent portions of the material. Any of a state, an extruded state of one or more modes in which a material flows through a part of the material merging portion, and an extruded state in which no material flows in the material merging portion is changed to an extruded state of two or more. As a result, a tube material is manufactured in which the communication holes of at least two or more partition walls are provided asymmetrically with each other in the tube length direction.

In addition, changing the extrusion conditions during extrusion can be easily achieved by using an ordinary extruder, as described above. In addition, at least two or more of the material converging portions between the molding projections are changed. Forming a die on a material that causes a difference in the ease with which extruded materials can be joined does not involve any difficulty in manufacturing the die.

[0020]

Next, an embodiment of the present invention will be described.

The tube according to the embodiment is an aluminum tube material used for a condenser for an air conditioner such as a car cooler among heat exchangers.

As shown in FIG. 2 (b), the tube material (1) is a flat tube material having an elliptical cross section and has three partition walls (2) (3) in the width direction in the hollow portion. ) (4)
Are arranged at intervals, and each partition wall (2), (3), (4) connects the upper and lower planar walls (5), (5) of the tube material (1) to form four chambers (6) in the width direction. ), (6), (6), and (6) are sectioned. Also, as shown in FIG. 1 (a), each partition wall (2), (3), (4) has
The communication holes (2a), (3a), (4a) are provided, and the holes (2a), (3
a) Through (4a), adjacent rooms (6) (6), (6)
(6) The communication is established.

The communication holes (3a) provided in the center partition wall (3) and the communication holes (2a) (4a) provided in the left and right partition walls (2) and (4). ), Each of the holes (3a), (2a), and (4a) has the same number of holes per unit length in the tube length direction and different hole sizes. It is formed in a left-right asymmetric state.

As shown in FIG. 6 (a), the tube member (1) is provided with a communication hole (3a) provided in a center partition wall (3) and a partition wall located on the left and right. (2) When the communication holes (2a) and (4a) provided in (4) are compared, the number of holes per unit length in the tube length direction is calculated by dividing the number of holes per unit length on both sides of the partition wall (2) (4). The partition wall (3) located at the center with the holes (2a) and (4a) in
In an embodiment in which the number of holes is larger than the number of holes (3a) and the hole size is also different, the holes may be formed in a left-right asymmetric state.

As shown in FIG. 7 (a), the tube member (1) is provided with a communication hole (3a) provided in a partition wall (3) located at the center and partitions located on both sides thereof. In comparison with the communication holes (2a) and (4a) provided in the walls (2) and (4), the number of holes per unit length in the tube length direction indicates the number of holes at the center of the partition wall (3). In this embodiment, the number of holes (3a) is larger than the number of holes (2a) and (4a) in the partition walls (2) and (4) on both sides, and the holes have different sizes. It may be something. In addition, not limited to these, other,
It may be formed in a left-right asymmetric state in various aspects.

Each of the tube members (1), (1), and (1) is made of an integrally formed aluminum extruded material.

For the extrusion production, an extrusion die as shown in FIGS. 2A and 5 is used. This die (10)
Is a combination die combining a female mold (11) and a male mold (12). The female mold (11) has a molding hole (11a) for molding the outer peripheral shape of the tube material (1), A recess (11b) for a material welding chamber is formed behind the molding hole (11a) in the extrusion direction. Also,
The male mold (12) is provided with a core (12b) supported by a bridge (12a) in such a manner that the tip protrudes, and the tube material (1) is arranged in a width direction parallel to the tip of the core (12b). Plural forming protrusions (12c) for forming the inner peripheral shape
Are provided, and a material converging section (14) (15) (16) for forming a partition wall (2) (3) (4) in the tube material (1) between adjacent forming protrusions (12c). Are formed.

The material merging portion (14), (15), (16) has a longitudinal length L1 of the material merging portion (15) located at the center thereof.
However, in a mode in which the material merging portions (14) and (16) located on the left and right sides are relatively longer than the length L2 in the front-rear direction, the shapes and sizes thereof are different from each other. As a result, a difference is produced between the ease of joining the materials at the central material joining section (15) and the ease of joining the materials at the left and right material joining sections (14) and (16). ing.

As shown in FIG. 3 (a), as a configuration for causing a difference in the easiness of merging of the respective materials at the plurality of material merging portions, as shown in FIG. In addition to changing the length L in the front-rear direction of the material merging portions (14), (15) and (16), each material merging portion (14) (15)
(16), and as shown in FIG. 3 (b), the inclination angle α of the material guiding surface (18) at the material merging portions (14), (15), (16). Or the bearing lengths between the molded projections (12c), (12c) and (12c) are different, or at least two of L, W, α and the bearing length are combined to be different. A configuration mode may be adopted. In short,
Any configuration may be used as long as it causes a difference in the ease of merging of the materials in the material merging portions (14), (15), and (16).

The extrusion was performed using a combination die (1
As shown in FIG. 5, the extruder is loaded with an aluminum billet (B) into the extruder container (20), and the ram (21) is driven forward.
Do.

In this extrusion, FIGS. 1 (a) and 6
In order to extrude the tube material (1) (1) (1) as shown in (a) and FIG. 7 (a), all the material confluences (14) (15) (16) In the extruded state where the materials are merged in the above, the materials are merged in a part of the material merging part (15) and the remaining material merging part (14)
The extruded state in which the materials are not merged in (16) and the extruded state in which the materials are not merged in all the material merging portions (14), (15) and (16) are changed into three extruded states. There is a need.

As an element giving a change to such an extrusion state, a ram speed, that is, a product extrusion speed can be mentioned. In addition, billet temperature, die temperature, and the like can be considered.

FIG. 4 shows the relationship between the product extrusion speed and the extrusion state at each billet temperature. That is, at the product extrusion speed below the line A, the materials merge at all the material merging portions (14), (15), and (16), and at the product extrusion speed in the region between the lines A and B, one. At the material confluence (15) of the parts, the material confluence is made,
In the other remaining material confluences (14) and (16), the materials do not converge, and at the product extrusion speed above the line B, the material converges in all the material confluences (14), (15) and (16). No merging occurs.

Thus, during extrusion, the product extrusion speed is varied between the speed in the region below line A, the speed in the region between lines A and B, and the speed in the region above line B. Thus, the communication hole (3a) in the central partition wall (3) and the communication holes (2a) (4a) in the left and right partition walls (2) and (4) are asymmetrical in the tube length direction, as shown in FIG. The tube materials (1), (1), and (1) as shown in FIGS. 6A, 6A, and 7A are extruded.

Specifically, the tube material (1) shown in FIG. 1 (a) uses an aluminum billet at a predetermined temperature, and changes the product extrusion speed during extrusion as shown in FIG. 1 (b). It is produced by letting it go. FIG.
The tube material (1) shown in (a) is manufactured by using an aluminum billet at a predetermined temperature and changing the product extrusion speed during extrusion as shown in (b) in the figure. The tube material (1) shown in FIG. 7 (a) is manufactured by using an aluminum billet at a predetermined temperature and changing the product extrusion speed during extrusion as shown in FIG. 7 (b). Is done.

In the above-described embodiment, the dies are easily joined at the material merging portions (14), (15), and (16) between the molded projections (12c), (12c), (12c), and (12c). By using a die (10) having a structure that causes a difference in the height and changing the ram speed to a predetermined mode during extrusion, each communication hole of the partition wall (2) (3) (4) is formed. (2a), (3a) and (4a) are to manufacture the tube material (1) which is provided in the tube length direction so as to be left-right asymmetric. However, as other dice,
By changing extrusion conditions such as ram speed during extrusion while using dies that have no structural difference in terms of ease of material consolidation at each material confluence between molding protrusions, Depending on how the extrusion conditions are set, a tube material is provided in which the communication holes are provided asymmetrically with respect to each other in the tube length direction by utilizing the turbulence of the flow of the extruded material which can be inevitably generated in the extrusion. be able to.

As shown in FIG. 8, the tube material is provided with a communication hole (2a) in the left and right partition walls (2) and (3).
The structure (3a) may be formed so as to have a staggered arrangement relationship. In the production of the tube material (1) in which the communication holes (2a) and (3a) are arranged in a staggered manner, the difference in the ease of material joining at the material joining portion between the molding protrusions also occurs as a die. The extrusion conditions such as the ram speed are changed during the extrusion using the characteristics shown in FIG. 4, for example, or a normal die is used as the die. Meanwhile, it can be performed by changing the extrusion conditions such as the ram speed to a predetermined mode using the characteristics as shown in FIG. 4, for example.

[0038]

As described above, according to the heat exchanger tube material of the first invention, the communication holes of at least two or more of the plurality of partition walls provided in the heat exchanger tube material have a tube length. Are provided in the left-right asymmetric state in the direction, the turbulence of the flow of the heat exchange medium flowing inside the tube material is promoted, and the movement of the heat exchange medium in the width direction is more effectively performed. As a result, the heat exchange performance of the heat exchanger can be further improved than before.

Further, the manufacturing method according to the second aspect of the present invention is to change the extrusion conditions such as the ram speed during the extrusion,
In the extrusion state in which the material flows through all the material merging sections in the die, the extrusion state in one or more modes in which the material flows through some of the material merging sections, and the extrusion state in which the material does not flow through the material merging section, Since each of them is changed into two or more extrusion states, depending on the setting of extrusion conditions, at least two or more communication holes of the partition walls are provided in the tube length direction in a bilaterally asymmetric state with respect to each other. Tubing can be manufactured.

In addition, changing the extrusion conditions during extrusion can be easily performed by using an ordinary extruder. In comparison with the method described in the above-mentioned prior art, the equipment and cost are reduced. Advantageously, such tubes can be manufactured. You.

Further, since the extrusion die according to the third invention is formed so as to cause a difference in the ease of joining of the extruded materials in at least two or more of the material joining portions between the forming convex portions, the ram speed is increased. By changing the extrusion conditions during extrusion, such as when flowing the material to all the material confluence, when flowing the material to some material confluence, or when not flowing the material to the material confluence An extruded state can be formed. Therefore, during the extrusion, by changing the extrusion state to such an extrusion state, each of the communication holes of at least two or more partition walls is provided in a tube length direction in a left-right asymmetric state with respect to each other. The production of the material can be realized with high certainty and stability.

In addition, changing the extrusion conditions during extrusion can be easily achieved by using an ordinary extruder, as described above. In addition, at least two or more of the material converging portions between the molding projections are changed. Forming a die on a material that causes a difference in the ease of merging of extruded materials does not involve any difficulty in manufacturing the die, and is therefore more difficult than in the case of the die described in the above prior art. Advantageously, such a tube can be manufactured in terms of equipment, cost, and the like.

Of course, since it is based on the extrusion integral forming method, the production can be efficiently performed without requiring many steps in the production.

Further, the manufacturing method according to the fourth invention is characterized in that
By using the extrusion die according to the present invention and changing extrusion conditions such as a ram speed during extrusion, an extrusion state in which the material flows through all the material merging portions, and 1 or 2 in which the material flows through some of the material merging portions. Either the extruded state in the above-described embodiment or the extruded state in which no material flows in the material merging portion is changed into two or more extruded states. Therefore, each communication hole of at least two or more partition walls is used. However, the manufacture of the tube materials provided in the tube length direction in the left-right asymmetric state can be realized with the same high reliability and stability.

In addition, as described above, changing the extrusion conditions during extrusion can be easily achieved by using an ordinary extruder. In addition, at least two or more of the material converging portions between the molding projections are changed. Forming a die on the one that causes a difference in the ease of merging of extruded materials does not involve any difficulty in manufacturing the die, and therefore, compared to the case of using the above-described conventional die, Such a tube can be advantageously manufactured in terms of facilities, cost, and the like.

Of course, since it is based on the extrusion integral forming method, the production can be efficiently performed without requiring many steps in the production.

[Brief description of the drawings]

FIG. 1A shows a tube member according to an embodiment, and FIG. 2B is a cross-sectional view taken along line II of FIG. 2B, and FIG. 1B shows a tube member and a length shown in FIG. FIG. 7 is a graph showing the relationship between the extrusion time and the product extrusion speed, which is shown in the vertical direction correspondence relationship.

FIG. 2A is an enlarged sectional view of a main part of a die, and FIG.
Is a cross-sectional view of the tube material.

FIG. 3A is a cross-sectional view of a material merging portion in a male die, and FIG. 3B is a cross-sectional view taken along line III-III in FIG.

FIG. 4 is a glass diagram showing the relationship between billet temperature and product extrusion speed.

FIG. 5 is a sectional view of an extruder.

FIG. 6 (a) is a cross-sectional view showing a tube material according to another embodiment, and FIG. 6 (b) is a drawing showing the relationship between the tube material shown in FIG. It is a graph which shows the relationship with a product extrusion speed.

FIG. 7A is a cross-sectional view showing a tube material according to still another embodiment, and FIG. 7B is an extrusion time shown in a longitudinal direction relationship with the tube material shown in FIG. FIG. 4 is a graph showing the relationship between the product and the product extrusion speed.

FIG. 8 is a sectional view showing a tube material according to still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tube material 2, 3, 4 ... Partition wall 2a, 3a, 4a ... Communication hole 6 ... Chamber 10 ... Die 12c ... Molding convex part 14, 15, 16 ... Material joining part

Continuation of front page (56) References JP-A-57-174696 (JP, A) JP-A-59-107191 (JP, A) JP-A-1-284423 (JP, A) JP-A-58-136419 (JP) JP-A-56-44628 (JP, A) JP-A-64-22179 (JP, U) JP-A-61-79774 (JP, U) JP-A-60-177052 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) F28F 1/02 B21C 23/08 B21C 25/02 B21C 23/10

Claims (4)

(57) [Claims] 1. A female mold having a forming hole for forming an outer peripheral portion of a flat tube material, and three or more chambers formed in the flat tube material in a width direction in a number corresponding to the number of the chambers. Extrusion using a male / female combination type extruder that combines a male and female die with an extruded part. Any of a state, an extruded state of one or more modes in which a material flows through a part of the material merging portion, and an extruded state in which no material flows in the material merging portion is changed to an extruded state of two or more. A method for producing a porous tube material for a heat exchanger. 2. A female mold having a forming hole for forming an outer peripheral portion of a flat tube material, and three or more chambers formed in the flat tube material in a width direction in a number corresponding to the number of the chambers. In a male / female combination type extrusion die for manufacturing a tube material for a heat exchanger in which a male mold having a convex portion is combined, a difference is generated in the ease of merging of the extruded materials at at least two or more of the material merging portions between the molded convex portions. An extrusion die for producing a porous tube material for a heat exchanger, wherein the extrusion die is formed into a product. 3. A female mold having a forming hole for forming an outer peripheral portion of a flat tube material, and three or more chambers formed in the flat tube material in a width direction in a number corresponding to the number of the chambers. An extruding die for producing a tube material for a heat exchanger of a male and female combination type in which a male mold having a convex portion is combined, the difference in the ease of joining of extruded materials in at least two or more of the material merging portions between the molded convex portions. By using a die formed on the material to be produced, and changing extrusion conditions such as ram speed during extrusion, an extrusion state in which the material flows through all the material merging sections, and a material flowing through some of the material merging sections 1 Or a method of manufacturing a porous tube material for a heat exchanger, wherein any one of an extruded state of two or more embodiments and an extruded state in which no material flows in a material merging portion is changed to two or more extruded states. . 4. The interior manufactured by the manufacturing method according to claim 1 or 3 having a plurality of partition walls in the width direction.
A flat heat exchanger tube material partitioned into one or more chambers, wherein each partition wall is provided with a hole communicating between adjacent chambers, and each communication hole of at least two or more partition walls is A tube material for a heat exchanger, which is provided so as to be left-right asymmetric in the tube length direction.