JPS59125395A - Manufacture of tube for heat exchanger - Google Patents

Abstract

PURPOSE:To increase heat exchanging efficiency, by a method wherein a fluid such as a coolant flowing within a duct is mixed equally and at the same time the direction of flow of the fluid is disturbed by a large number of protruded parts. CONSTITUTION:An aluminum plate 1 on which solder made of Al-Mg-Si group alloy is made to adhere is made into a required thickness through rolling and a large number of protruded parts 2 protruded on one side of the aluminum plate 1 is formed on a predetermined position of the belt-shaped aluminum plate 1 through pressing. A tube 5 for a heat exchanger having a fluid duct 4 is formed by a method wherein an uprising edge part 3 is formed by bending both side edge parts of the belt-shaped aluminum plate 1 respectively, protruded parts 2 of a left half-part 1a and a right half-part 1b are made to abutt against the inside of the confronting right half-part 1b and left half-part 1a respectively by bending the aluminum plate 1 and piling up the left half-part 1a and the right half- part 1b with each other, and a fluid duct space is formed inside the bent aluminum plate 1 by butting the tips of the uprising edge parts 3 against each other, which are connected by welding with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the manufacture of flat heat exchanger tubes used as evaporators and condensers of car coolers, or heat exchangers such as radiators and oil coolers. It is about law.

In general, in heat exchangers that use fluids such as refrigerant, oil, and water, improvements are made to improve the heat transfer coefficient on the ventilation side, as well as on the inside of tubes such as refrigerant passages, and to increase the inner surface area.
Tubes of various constructions are used for c. For example, as shown in Fig. 23, a conventional heat exchanger tube has a flat aluminum wrap (12) having a fluid passage (14) for refrigerant, etc., which is provided at the same time as the extrusion mold side. This heat exchanger tube <15) is bent into a serpentine shape.
The heat exchanger (16) was manufactured by interposing corrugated fins (17) in the curves of the straight pipe portions of the heat exchanger tubes (1!i) facing each other. however,
In such a conventional heat exchanger (16), the fluid passages (14) located on the leeward side and the leeward side (11) are located on the same side over the entire length from the inlet to the outlet of the heat exchange tube (16). Therefore, for the heat exchanger 'i'2'<
The heat exchange conditions of the fluid in the fluid passage (14) at the windward edge of 15) are the best, and the conditions gradually become worse on the leeward side, reaching the downstream edge. Heat exchange conditions were also poor in Tbn. Therefore, a large difference in heat exchange efficiency t occurs between the fluid passing through the leeward side oil passage 14) and the fluid passing through the leeward side passage (14).
There was a problem in that the heat exchanger (16) as a whole had poor heat exchange performance.

In addition, in the conventional heat exchanger (16), one plate (15) is made of pure aluminum, and the other plate is made of corrugated aluminum.
~・The fin (17) is Am− on the surface of tunorminium N.
41'4 is formed by a brazing sheet in which brazing sheet 4A made of Mg-8i alloy is applied, but in this case, the joint of the brazing material of the corrugated fin (17) and the pipe (15) are connected to each other. In particular, since 3i in the brazing filler metal acts as a cathode, the tube (15) side corrodes, causing the heat exchanger (16) to lose its firepower relatively quickly. there were.

In addition, the corrugated fin (17) is formed by cutting and raising a large number of body plate-shaped protrusions with louver grooves 1 by press working, but the corrugated fin (17) is made of the above-mentioned Δρ-Mg-3i alloy. Since the brazing sheet (= I) attached to the surface is very hard, the mold for forming the fin material is likely to wear out during the pressing process, resulting in a problem that the life of the mold is very short.

This invention was made in order to solve the above problem, and its development is shown in the drawings below and will be explained based on an embodiment.
Ru.

1 to 8 show a first embodiment of the present invention.

The method of this invention consists of the following steps.

First, an aluminum plate (1) whose surface (for example, a brazing filler metal made of A4-tylg-8i alloy) has been roughened is rolled to the required thickness, and the thickness of the heat exchanger tube (5) is adjusted to the desired thickness. The unfolded width of the aluminum plate (1) is determined from the width.Next, a large number of protrusions (2) protruding from one side of the aluminum plate (1) are formed at predetermined locations on the band-shaped aluminum plate (1) by press working. (Figures 1 and 2).The protrusion (2) formed on the aluminum plate (1) is shown in Figures 6 and 7.
As shown in detail in the figure, it has a hemispherical shape, and an IL flat part (2a) is formed at its tip to increase the bonding area. Such a hemispherical protrusion (2) has good workability and is useful for continuous molding of a long aluminum plate (1).

Next, both side edges of the strip-shaped aluminum plate (1) are bent, respectively, to form rising edges (3) (3) that protrude on the same side as the protrusion (2>) (FIG. 3).

Next, bend the aluminum plate (1) so that the protrusion (2) is inward from the center of its width, and separate the left half (1a) and right half (1b) of the aluminum plate (1). The protrusion (2) of the left half (1a) and the right half (
1b) and the left half (1a
) and the inner surface of the right half (ill), respectively, and a rising edge (3> (3)) is formed.

In this state II, the tips of the rising edges (3) (3) are joined to each other by seam welding, bullet welding, etc., and the heat exchanger tube (5) having the fluid passage (4) is
) is formed (Figure 4 J3 and Figure 5).

After the heat exchanger tube (5) has been made to the required length, it is bent into a meandering shape, for example, as shown in FIG. 8, and the tube (5) is straightened. Part 3 (5a) Between the comrades, for example, a col made of pure aluminum plate, goo 1 ~ fin (
7) and attach aluminum headers (8) to both ends of the tube (5), respectively. This is where the exchanger (6) will be manufactured.

In addition, by this vacuum brazing, each member is joined to the phase H, and the left ``1'' portion (1a) (7) of the aluminum plate (2) of the heat exchanger tube (55) is connected to the protrusion (2) and the right half. The portions (111), (7) and the protrusion (2) are joined to the inner surface J of the left half portion (1a) and the inner surface of the right half portion (1b) which are opposed to these.

Since the heat exchanger tube (5) manufactured by the above hγ method has only one fluid passage (4) formed inside, the fluid such as refrigerant flowing inside the passage (4) is Evenly mixed. However, the flow direction of the fluid is disturbed due to the large number of protrusions formed in the heat exchanger tube (5), which further increases the fluid exchange efficiency.
) as a result of the formation of a large number of protrusions (2) in the interior of the tube (5), these protrusions (2) 1. A large number of corresponding concave portions are formed, and these four portions create turbulence in the wind passing through the gaps between the corrugated fins (7), which increases the heat exchange efficiency.

There are two types of heat exchanger tubes (5) produced by the method of this invention: independent type and opposed type. The heat exchanger tube (i'5) of the first embodiment is an LL independent type. In other words, by making the height of each protrusion (2) lower than the intended thickness of the tube (5) by the thickness of the aluminum material, and by bending the aluminum ifi (,1), (2) is independently brought into contact with the inner surface of the aluminum plate (1) facing it, and the tip of the protrusion (2) and the inner surface of the aluminum shim plate (1) are joined to each other.

As shown in Figures 9 and 10, the above-mentioned opposed type heat exchanger tubes (5
〉. At the same time, the height of each protrusion (2) is set to 1/2 of the intended thickness of the heat exchanger tube (5), and the aluminum plate 1) is bent from the center of its width. When the left half (1a) and right half (1b) of the board (1) are stacked on top of each other, the left half (1a)
) is formed so that the protrusion (2) of the right half (1b) faces each other.Then, the protrusion (2) of the left half (1a) of the aluminum plate (1) is ) and the protrusion (2) of the right half (11)) are brought into contact with each other, and these protrusions (2>(2>) are joined together.

11 and 12 show a third embodiment of the present invention, in which the heat exchanger tube (5) is an independent type as in the first embodiment, but The difference from the above case lies in the arrangement of the protrusions (2). However, in the case of the first embodiment, the rows of protrusions (2) in the length direction and the rows of protrusions (2) in the width direction of the heat exchanger tube (5) are orthogonal to each other. On the other hand, in the case of this third embodiment, the row of projections (2) in the width direction is arranged at an angle of 90 degrees or more with respect to the row of projections (2) in the length direction, so to speak. It is. When the rows of protrusions (2) are arranged in an inclined state in this way, the heat exchanger tubes (
5) and the corrugated fin (7) are bonded uniformly, which is preferable.

13 and 14 show a fourth embodiment of the present invention, in which the heat exchanger tubes (1> are of the opposed type as in the second embodiment, but the second embodiment In the case of , the protrusion (
2) The arrangement is different. The arrangement of the protrusions (2) is the same as in the third embodiment, and the heat exchanger tubes (5)
A row of protrusions (2) in the length direction and a row of protrusions (2) in the width direction are arranged in an inclined manner.

Figures 15 and 16 show modified examples of the protrusions (2) formed on the aluminum plate (1) in the method of the present invention.
'b's. Unlike the hemispherical protrusion (2) in J31 in the first to fourth embodiments, this protrusion (2) has a truncated conical shape.

By forming a large number of such truncated conical protrusions (2) on the aluminum plate (1), they can be used for heat exchangers. 3
'1 stain deformation (due to internal pressure) in (5) can be effectively prevented.

Figures 17 to 20 show the fifth embodiment of the present invention.
It is also. In this example, aluminum plate (1)
A large number of oval protrusions (2) are formed when viewed from the plane, and the directions of these oval protrusions (2) are set to match the adjacent protrusions (2).
) rows are alternately different from each other, and the glue 14 of the protrusions (2) in the width direction is inclined with respect to the row of oval protrusions (2) in the length direction of the heat exchanger tube (5). This is what was placed. These oval protrusions (2) have directional properties, so when fluid such as refrigerant flowing in the passage (4) hits these protrusions (2), the direction of the flow is changed. It is preferable that the width of the heat exchanger 11 and 5) is large and that the C fluid is mixed uniformly. When the internal pressure is low, the heat dissipation performance can be improved with a small number of protrusions (2).

FIGS. 21 and 22 show a modification of the protrusion (2) formed on the aluminum plate (1) by the method of the present invention. Unlike the case of the fifth embodiment, this protrusion (2) has a rhombus shape when viewed from above.

By forming such a diamond-shaped protrusion (2) on the aluminum plate (1), the passage (4) for fluid such as refrigerant is formed.
This is preferable because the resistance inside J3f can be made small.

Note that the shape of the protrusions (2) formed on the aluminum plate (1) may of course be other than the above, and these protrusions (2) may be arranged in a regular arrangement or a staggered arrangement. You can also arrange them in an array.

The method for manufacturing a heat exchanger tube according to the present invention is as follows: 1. As described above, the aluminum plate (1) is formed by press-cutting the aluminum plate (1) at a predetermined location on a belt-shaped aluminum plate (1) having a predetermined width and having a brazing filler metal adhered to the surface. A large number of protrusions (2) are formed on one side of the plate, and both side edges of the strip-shaped aluminum plate (1) are
T-fold () and a protruding stand on the same side as the protrusion (2).
Form two key crack parts (3) (3), then aluminum plate (1)
Bend this so that the protruding part 2) is inward from the center of the width, and align the left half (1a) and right half (11) of the aluminum plate (1) with each other. , left hand (1
Combine the protrusion (2) of a) and the protrusion of the right half (1b) with each other.
are brought into contact with the inner surfaces of the opposing left half (1a) and right half (1b), respectively, and the rising edge (3)
(3) are butted against each other with a υ angle to form a space for a fluid passage inside the bent aluminum plate (1), and in this υ (state) the rising edge (3) (3) is formed. ) are joined together in a U-shape, and the aluminum plate (1) is
The protrusion (2) on the left half (1a) and the protrusion (2) on the right half (1b), or the inner surface of the left half (1a) facing these protrusions (2) <2) The heat exchanger tube (5) manufactured by the method of the present invention has only one fluid passage (4) inside. Because it is formed,
4) Fluid such as refrigerant flowing through the passage is mixed uniformly,
Therefore, it is possible to prevent the performance of the heat exchanger (6) from deteriorating due to the difference in heat exchange efficiency between the black side and the leeward side of the heat exchanger (6) as in the past.1)
Moreover, the flow direction of the fluid is disturbed by a large number of protrusions (2) formed in the heat exchanger tube (5), and the heat exchange efficiency is further increased. As a result of the large number of protrusions 2) formed inside the mano-ζ tube (5), the outer surface of the tube 5) has a number of concave portions (b) corresponding to these protrusions (2). J5, these four parts create a corrugated fin (7
), turbulence occurs in the wind passing through the gap, increasing heat exchange efficiency. Since the heat exchanger tube 5) is made of an aluminum plate (1) with a wax coating on its surface, the Korgu 1~.
A thin plate made of pure aluminum can be used as the material for the fin (7), and therefore heat exchange 2;: (6)
Contrary to the conventional case, corrosion at the joint between the pipe (5) and the fin (7) occurs on the fin (7) side, so corrosion of the pipe (5) cannot be effectively prevented. Therefore, the heat exchanger (6) can withstand long-term use. In addition, since pure aluminum sheets are softer than plastic zinc sheets, it is easy to press the material of the corrugated fin (7) to form open plate-like protrusions. This has the effect of being able to prevent mold wear as much as possible and significantly increasing the life of the mold.

[Brief explanation of the drawing]

Figures 1 to ε3 show a first embodiment of the present invention, in which Figure 1 is a plan view of an aluminum plate on which protrusions are formed, Figure 2 is a front view of the same, and Figure 3 is a rising edge. Fig. 4 is an enlarged front view of the heat exchanger tube, Fig. 5 is an enlarged plan view of the same, and Fig. 6 is a partial enlarged plane I of the protrusions in Fig. 4.
, FIG. 7 is an enlarged sectional view taken along line A-A in FIG. 6, FIG. 8 is a partially cutaway perspective view of a heat exchanger using a heat exchanger tube according to the method of the present invention, and FIG. 9 is a diagram showing the present invention. FIG. 10 is an enlarged plan view of the heat exchanger tube without showing the second embodiment of the present invention, and FIG. 11 is an enlarged front view of the heat exchanger tube without showing the third embodiment of the present invention. Fig. 12 is an enlarged plan view of the same, Fig. 13 is an enlarged 1f side view of a heat exchanger tube showing a fourth embodiment of the present invention, Fig. 14 is an enlarged plan view between 1 and 1, and Fig. 15 is an enlarged plan view of the protrusion. 1 minute enlarged plan view of rjl that accepts a modified example, Figure 16 is Figure 15B
17 is an enlarged front view of the fifth embodiment, FIG. 18 is an enlarged plan view thereof, and FIG. 19 is an enlarged sectional view taken along line B.
FIG. 20 is an enlarged sectional view taken along the line CC in FIG. 19, and FIG. 21 is a partially enlarged plan view showing a modified example of the protrusion. (1)...aluminum plate, (1a)...left half,
(11) )...Right half, (2)...Protrusion, (3)
...Rising edge, (4)...Fluid passage, (5)...
... Heat exchanger tube, (6) ... Heat exchanger, (7) ...
・Corrugate fin. Applicant for the above patents: Showa Aluminum Co., Ltd. Figure 1, Figure 51, Figure 1X, Figure 5 a, Figure 12, Figure 14, Figure 15, l, Figure 18, Figure 19, Figure 21

Claims (1)

[Claims] A real aluminum plate is formed by press working at a predetermined location on a band-shaped aluminum plate (1) of a predetermined width with a wax abrasions attached to the surface.
A large number of protrusions (2) protruding from one side of 1) are formed, and both edges of the strip-shaped aluminum plate (1) are bent respectively to form a rising edge (3) protruding from the same side as the protrusions (2). (3), then bend the aluminum plate (1) from the center of its width so that the protrusion (2) is on the inside, and then fold the left half (1a) and the right half of the aluminum plate (1). Part (1
Stack b) on top of each other, attach 3 and 4, and make the left birth part (1a).
The protrusions (2) and the protrusions of the right half (1b) are brought into contact with each other, or the protrusions (2) (2) of the half (1a) and the right half (1b) are made to face each other. 1b), and the tips of the rising edges (3) (3) are brought into contact with each other to form a fluid passage space inside the bent aluminum plate (1). Then, in this state, join the tips of the vertical edges (3)<3) to each other, and glue the aluminum plate (1) to the protrusion (2) of the half part (1a) and the right half part ( 1b) or the inner surface of the left half (1a) facing the protrusions (2) (2) and the inner surface of the right half (1b). A method for manufacturing a material for heat exchanger, characterized by joining by.